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diff --git a/test/packetimpact/README.md b/test/packetimpact/README.md deleted file mode 100644 index f46c67a0c..000000000 --- a/test/packetimpact/README.md +++ /dev/null @@ -1,702 +0,0 @@ -# Packetimpact - -## What is packetimpact? - -Packetimpact is a tool for platform-independent network testing. It is heavily -inspired by [packetdrill](https://github.com/google/packetdrill). It creates two -docker containers connected by a network. One is for the test bench, which -operates the test. The other is for the device-under-test (DUT), which is the -software being tested. The test bench communicates over the network with the DUT -to check correctness of the network. - -### Goals - -Packetimpact aims to provide: - -* A **multi-platform** solution that can test both Linux and gVisor. -* **Conciseness** on par with packetdrill scripts. -* **Control-flow** like for loops, conditionals, and variables. -* **Flexibilty** to specify every byte in a packet or use multiple sockets. - -## How to run packetimpact tests? - -Build the test container image by running the following at the root of the -repository: - -```bash -$ make load-packetimpact -``` - -Run a test, e.g. `fin_wait2_timeout`, against Linux: - -```bash -$ bazel test //test/packetimpact/tests:fin_wait2_timeout_linux_test -``` - -Run the same test, but against gVisor: - -```bash -$ bazel test //test/packetimpact/tests:fin_wait2_timeout_netstack_test -``` - -## When to use packetimpact? - -There are a few ways to write networking tests for gVisor currently: - -* [Go unit tests](https://github.com/google/gvisor/tree/master/pkg/tcpip) -* [syscall tests](https://github.com/google/gvisor/tree/master/test/syscalls/linux) -* [packetdrill tests](https://github.com/google/gvisor/tree/master/test/packetdrill) -* packetimpact tests - -The right choice depends on the needs of the test. - -Feature | Go unit test | syscall test | packetdrill | packetimpact --------------- | ------------ | ------------ | ----------- | ------------ -Multi-platform | no | **YES** | **YES** | **YES** -Concise | no | somewhat | somewhat | **VERY** -Control-flow | **YES** | **YES** | no | **YES** -Flexible | **VERY** | no | somewhat | **VERY** - -### Go unit tests - -If the test depends on the internals of gVisor and doesn't need to run on Linux -or other platforms for comparison purposes, a Go unit test can be appropriate. -They can observe internals of gVisor networking. The downside is that they are -**not concise** and **not multi-platform**. If you require insight on gVisor -internals, this is the right choice. - -### Syscall tests - -Syscall tests are **multi-platform** but cannot examine the internals of gVisor -networking. They are **concise**. They can use **control-flow** structures like -conditionals, for loops, and variables. However, they are limited to only what -the POSIX interface provides so they are **not flexible**. For example, you -would have difficulty writing a syscall test that intentionally sends a bad IP -checksum. Or if you did write that test with raw sockets, it would be very -**verbose** to write a test that intentionally send wrong checksums, wrong -protocols, wrong sequence numbers, etc. - -### Packetdrill tests - -Packetdrill tests are **multi-platform** and can run against both Linux and -gVisor. They are **concise** and use a special packetdrill scripting language. -They are **more flexible** than a syscall test in that they can send packets -that a syscall test would have difficulty sending, like a packet with a -calcuated ACK number. But they are also somewhat limimted in flexibiilty in that -they can't do tests with multiple sockets. They have **no control-flow** ability -like variables or conditionals. For example, it isn't possible to send a packet -that depends on the window size of a previous packet because the packetdrill -language can't express that. Nor could you branch based on whether or not the -other side supports window scaling, for example. - -### Packetimpact tests - -Packetimpact tests are similar to Packetdrill tests except that they are written -in Go instead of the packetdrill scripting language. That gives them all the -**control-flow** abilities of Go (loops, functions, variables, etc). They are -**multi-platform** in the same way as packetdrill tests but even more -**flexible** because Go is more expressive than the scripting language of -packetdrill. However, Go is **not as concise** as the packetdrill language. Many -design decisions below are made to mitigate that. - -## How it works - -``` - Testbench Device-Under-Test (DUT) - +-------------------+ +------------------------+ - | | TEST NET | | - | rawsockets.go <-->| <===========> | <---+ | - | ^ | | | | - | | | | | | - | v | | | | - | unittest | | | | - | ^ | | | | - | | | | | | - | v | | v | - | dut.go <========gRPC========> posix server | - | | CONTROL NET | | - +-------------------+ +------------------------+ -``` - -Two docker containers are created by a "runner" script, one for the testbench -and the other for the device under test (DUT). The script connects the two -containers with a control network and test network. It also does some other -tasks like waiting until the DUT is ready before starting the test and disabling -Linux networking that would interfere with the test bench. - -### DUT - -The DUT container runs a program called the "posix_server". The posix_server is -written in c++ for maximum portability. It is compiled on the host. The script -that starts the containers copies it into the DUT's container and runs it. It's -job is to receive directions from the test bench on what actions to take. For -this, the posix_server does three steps in a loop: - -1. Listen for a request from the test bench. -2. Execute a command. -3. Send the response back to the test bench. - -The requests and responses are -[protobufs](https://developers.google.com/protocol-buffers) and the -communication is done with [gRPC](https://grpc.io/). The commands run are -[POSIX socket commands](https://en.wikipedia.org/wiki/Berkeley_sockets#Socket_API_functions), -with the inputs and outputs converted into protobuf requests and responses. All -communication is on the control network, so that the test network is unaffected -by extra packets. - -For example, this is the request and response pair to call -[`socket()`](http://man7.org/linux/man-pages/man2/socket.2.html): - -```protocol-buffer -message SocketRequest { - int32 domain = 1; - int32 type = 2; - int32 protocol = 3; -} - -message SocketResponse { - int32 fd = 1; - int32 errno_ = 2; -} -``` - -##### Alternatives considered - -* We could have use JSON for communication instead. It would have been a - lighter-touch than protobuf but protobuf handles all the data type and has - strict typing to prevent a class of errors. The test bench could be written - in other languages, too. -* Instead of mimicking the POSIX interfaces, arguments could have had a more - natural form, like the `bind()` getting a string IP address instead of bytes - in a `sockaddr_t`. However, conforming to the existing structures keeps more - of the complexity in Go and keeps the posix_server simpler and thus more - likely to compile everywhere. - -### Test Bench - -The test bench does most of the work in a test. It is a Go program that compiles -on the host and is copied by the script into test bench's container. It is a -regular [go unit test](https://golang.org/pkg/testing/) that imports the test -bench framework. The test bench framwork is based on three basic utilities: - -* Commanding the DUT to run POSIX commands and return responses. -* Sending raw packets to the DUT on the test network. -* Listening for raw packets from the DUT on the test network. - -#### DUT commands - -To keep the interface to the DUT consistent and easy-to-use, each POSIX command -supported by the posix_server is wrapped in functions with signatures similar to -the ones in the [Go unix package](https://godoc.org/golang.org/x/sys/unix). This -way all the details of endianess and (un)marshalling of go structs such as -[unix.Timeval](https://godoc.org/golang.org/x/sys/unix#Timeval) is handled in -one place. This also makes it straight-forward to convert tests that use `unix.` -or `syscall.` calls to `dut.` calls. - -For example, creating a connection to the DUT and commanding it to make a socket -looks like this: - -```go -dut := testbench.NewDut(t) -fd, err := dut.SocketWithErrno(unix.AF_INET, unix.SOCK_STREAM, unix.IPPROTO_IP) -if fd < 0 { - t.Fatalf(...) -} -``` - -Because the usual case is to fail the test when the DUT fails to create a -socket, there is a concise version of each of the `...WithErrno` functions that -does that: - -```go -dut := testbench.NewDut(t) -fd := dut.Socket(unix.AF_INET, unix.SOCK_STREAM, unix.IPPROTO_IP) -``` - -The DUT and other structs in the code store a `*testing.T` so that they can -provide versions of functions that call `t.Fatalf(...)`. This helps keep tests -concise. - -##### Alternatives considered - -* Instead of mimicking the `unix.` go interface, we could have invented a more - natural one, like using `float64` instead of `Timeval`. However, using the - same function signatures that `unix.` has makes it easier to convert code to - `dut.`. Also, using an existing interface ensures that we don't invent an - interface that isn't extensible. For example, if we invented a function for - `bind()` that didn't support IPv6 and later we had to add a second `bind6()` - function. - -#### Sending/Receiving Raw Packets - -The framework wraps POSIX sockets for sending and receiving raw frames. Both -send and receive are synchronous commands. -[SO_RCVTIMEO](http://man7.org/linux/man-pages/man7/socket.7.html) is used to set -a timeout on the receive commands. For ease of use, these are wrapped in an -`Injector` and a `Sniffer`. They have functions: - -```go -func (s *Sniffer) Recv(timeout time.Duration) []byte {...} -func (i *Injector) Send(b []byte) {...} -``` - -##### Alternatives considered - -* [gopacket](https://github.com/google/gopacket) pcap has raw socket support - but requires cgo. cgo is not guaranteed to be portable from the host to the - container and in practice, the container doesn't recognize binaries built on - the host if they use cgo. -* Both gVisor and gopacket have the ability to read and write pcap files - without cgo but that is insufficient here because we can't just replay pcap - files, we need a more dynamic solution. -* The sniffer and injector can't share a socket because they need to be bound - differently. -* Sniffing could have been done asynchronously with channels, obviating the - need for `SO_RCVTIMEO`. But that would introduce asynchronous complication. - `SO_RCVTIMEO` is well supported on the test bench. - -#### `Layer` struct - -A large part of packetimpact tests is creating packets to send and comparing -received packets against expectations. To keep tests concise, it is useful to be -able to specify just the important parts of packets that need to be set. For -example, sending a packet with default values except for TCP Flags. And for -packets received, it's useful to be able to compare just the necessary parts of -received packets and ignore the rest. - -To aid in both of those, Go structs with optional fields are created for each -encapsulation type, such as IPv4, TCP, and Ethernet. This is inspired by -[scapy](https://scapy.readthedocs.io/en/latest/). For example, here is the -struct for Ethernet: - -```go -type Ether struct { - LayerBase - SrcAddr *tcpip.LinkAddress - DstAddr *tcpip.LinkAddress - Type *tcpip.NetworkProtocolNumber -} -``` - -Each struct has the same fields as those in the -[gVisor headers](https://github.com/google/gvisor/tree/master/pkg/tcpip/header) -but with a pointer for each field that may be `nil`. - -##### Alternatives considered - -* Just use []byte like gVisor headers do. The drawback is that it makes the - tests more verbose. - * For example, there would be no way to call `Send(myBytes)` concisely and - indicate if the checksum should be calculated automatically versus - overridden. The only way would be to add lines to the test to calculate - it before each Send, which is wordy. Or make multiple versions of Send: - one that checksums IP, one that doesn't, one that checksums TCP, one - that does both, etc. That would be many combinations. - * Filtering inputs would become verbose. Either: - * large conditionals that need to be repeated many places: - `h[FlagOffset] == SYN && h[LengthOffset:LengthOffset+2] == ...` or - * Many functions, one per field, like: `filterByFlag(myBytes, SYN)`, - `filterByLength(myBytes, 20)`, `filterByNextProto(myBytes, 0x8000)`, - etc. - * Using pointers allows us to combine `Layer`s with reflection. So the - default `Layers` can be overridden by a `Layers` with just the TCP - conection's src/dst which can be overridden by one with just a test - specific TCP window size. - * It's a proven way to separate the details of a packet from the byte - format as shown by scapy's success. -* Use packetgo. It's more general than parsing packets with gVisor. However: - * packetgo doesn't have optional fields so many of the above problems - still apply. - * It would be yet another dependency. - * It's not as well known to engineers that are already writing gVisor - code. - * It might be a good candidate for replacing the parsing of packets into - `Layer`s if all that parsing turns out to be more work than parsing by - packetgo and converting *that* to `Layer`. packetgo has easier to use - getters for the layers. This could be done later in a way that doesn't - break tests. - -#### `Layer` methods - -The `Layer` structs provide a way to partially specify an encapsulation. They -also need methods for using those partially specified encapsulation, for example -to marshal them to bytes or compare them. For those, each encapsulation -implements the `Layer` interface: - -```go -// Layer is the interface that all encapsulations must implement. -// -// A Layer is an encapsulation in a packet, such as TCP, IPv4, IPv6, etc. A -// Layer contains all the fields of the encapsulation. Each field is a pointer -// and may be nil. -type Layer interface { - // toBytes converts the Layer into bytes. In places where the Layer's field - // isn't nil, the value that is pointed to is used. When the field is nil, a - // reasonable default for the Layer is used. For example, "64" for IPv4 TTL - // and a calculated checksum for TCP or IP. Some layers require information - // from the previous or next layers in order to compute a default, such as - // TCP's checksum or Ethernet's type, so each Layer has a doubly-linked list - // to the layer's neighbors. - toBytes() ([]byte, error) - - // match checks if the current Layer matches the provided Layer. If either - // Layer has a nil in a given field, that field is considered matching. - // Otherwise, the values pointed to by the fields must match. - match(Layer) bool - - // length in bytes of the current encapsulation - length() int - - // next gets a pointer to the encapsulated Layer. - next() Layer - - // prev gets a pointer to the Layer encapsulating this one. - prev() Layer - - // setNext sets the pointer to the encapsulated Layer. - setNext(Layer) - - // setPrev sets the pointer to the Layer encapsulating this one. - setPrev(Layer) -} -``` - -The `next` and `prev` make up a link listed so that each layer can get at the -information in the layer around it. This is necessary for some protocols, like -TCP that needs the layer before and payload after to compute the checksum. Any -sequence of `Layer` structs is valid so long as the parser and `toBytes` -functions can map from type to protool number and vice-versa. When the mapping -fails, an error is emitted explaining what functionality is missing. The -solution is either to fix the ordering or implement the missing protocol. - -For each `Layer` there is also a parsing function. For example, this one is for -Ethernet: - -``` -func ParseEther(b []byte) (Layers, error) -``` - -The parsing function converts bytes received on the wire into a `Layer` -(actually `Layers`, see below) which has no `nil`s in it. By using -`match(Layer)` to compare against another `Layer` that *does* have `nil`s in it, -the received bytes can be partially compared. The `nil`s behave as -"don't-cares". - -##### Alternatives considered - -* Matching against `[]byte` instead of converting to `Layer` first. - * The downside is that it precludes the use of a `cmp.Equal` one-liner to - do comparisons. - * It creates confusion in the code to deal with both representations at - different times. For example, is the checksum calculated on `[]byte` or - `Layer` when sending? What about when checking received packets? - -#### `Layers` - -``` -type Layers []Layer - -func (ls *Layers) match(other Layers) bool {...} -func (ls *Layers) toBytes() ([]byte, error) {...} -``` - -`Layers` is an array of `Layer`. It represents a stack of encapsulations, such -as `Layers{Ether{},IPv4{},TCP{},Payload{}}`. It also has `toBytes()` and -`match(Layers)`, like `Layer`. The parse functions above actually return -`Layers` and not `Layer` because they know about the headers below and -sequentially call each parser on the remaining, encapsulated bytes. - -All this leads to the ability to write concise packet processing. For example: - -```go -etherType := 0x8000 -flags = uint8(header.TCPFlagSyn|header.TCPFlagAck) -toMatch := Layers{Ether{Type: ðerType}, IPv4{}, TCP{Flags: &flags}} -for { - recvBytes := sniffer.Recv(time.Second) - if recvBytes == nil { - println("Got no packet for 1 second") - } - gotPacket, err := ParseEther(recvBytes) - if err == nil && toMatch.match(gotPacket) { - println("Got a TCP/IPv4/Eth packet with SYNACK") - } -} -``` - -##### Alternatives considered - -* Don't use previous and next pointers. - * Each layer may need to be able to interrogate the layers around it, like - for computing the next protocol number or total length. So *some* - mechanism is needed for a `Layer` to see neighboring layers. - * We could pass the entire array `Layers` to the `toBytes()` function. - Passing an array to a method that includes in the array the function - receiver itself seems wrong. - -#### `layerState` - -`Layers` represents the different headers of a packet but a connection includes -more state. For example, a TCP connection needs to keep track of the next -expected sequence number and also the next sequence number to send. This is -stored in a `layerState` struct. This is the `layerState` for TCP: - -```go -// tcpState maintains state about a TCP connection. -type tcpState struct { - out, in TCP - localSeqNum, remoteSeqNum *seqnum.Value - synAck *TCP - portPickerFD int - finSent bool -} -``` - -The next sequence numbers for each side of the connection are stored. `out` and -`in` have defaults for the TCP header, such as the expected source and -destination ports for outgoing packets and incoming packets. - -##### `layerState` interface - -```go -// layerState stores the state of a layer of a connection. -type layerState interface { - // outgoing returns an outgoing layer to be sent in a frame. - outgoing() Layer - - // incoming creates an expected Layer for comparing against a received Layer. - // Because the expectation can depend on values in the received Layer, it is - // an input to incoming. For example, the ACK number needs to be checked in a - // TCP packet but only if the ACK flag is set in the received packet. - incoming(received Layer) Layer - - // sent updates the layerState based on the Layer that was sent. The input is - // a Layer with all prev and next pointers populated so that the entire frame - // as it was sent is available. - sent(sent Layer) error - - // received updates the layerState based on a Layer that is receieved. The - // input is a Layer with all prev and next pointers populated so that the - // entire frame as it was receieved is available. - received(received Layer) error - - // close frees associated resources held by the LayerState. - close() error -} -``` - -`outgoing` generates the default Layer for an outgoing packet. For TCP, this -would be a `TCP` with the source and destination ports populated. Because they -are static, they are stored inside the `out` member of `tcpState`. However, the -sequence numbers change frequently so the outgoing sequence number is stored in -the `localSeqNum` and put into the output of outgoing for each call. - -`incoming` does the same functions for packets that arrive but instead of -generating a packet to send, it generates an expect packet for filtering packets -that arrive. For example, if a `TCP` header arrives with the wrong ports, it can -be ignored as belonging to a different connection. `incoming` needs the received -header itself as an input because the filter may depend on the input. For -example, the expected sequence number depends on the flags in the TCP header. - -`sent` and `received` are run for each header that is actually sent or received -and used to update the internal state. `incoming` and `outgoing` should *not* be -used for these purpose. For example, `incoming` is called on every packet that -arrives but only packets that match ought to actually update the state. -`outgoing` is called to created outgoing packets and those packets are always -sent, so unlike `incoming`/`received`, there is one `outgoing` call for each -`sent` call. - -`close` cleans up after the layerState. For example, TCP and UDP need to keep a -port reserved and then release it. - -#### Connections - -Using `layerState` above, we can create connections. - -```go -// Connection holds a collection of layer states for maintaining a connection -// along with sockets for sniffer and injecting packets. -type Connection struct { - layerStates []layerState - injector Injector - sniffer Sniffer - t *testing.T -} -``` - -The connection stores an array of `layerState` in the order that the headers -should be present in the frame to send. For example, Ether then IPv4 then TCP. -The injector and sniffer are for writing and reading frames. A `*testing.T` is -stored so that internal errors can be reported directly without code in the unit -test. - -The `Connection` has some useful functions: - -```go -// Close frees associated resources held by the Connection. -func (conn *Connection) Close() {...} -// CreateFrame builds a frame for the connection with layer overriding defaults -// of the innermost layer and additionalLayers added after it. -func (conn *Connection) CreateFrame(layer Layer, additionalLayers ...Layer) Layers {...} -// SendFrame sends a frame on the wire and updates the state of all layers. -func (conn *Connection) SendFrame(frame Layers) {...} -// Send a packet with reasonable defaults. Potentially override the final layer -// in the connection with the provided layer and add additionLayers. -func (conn *Connection) Send(layer Layer, additionalLayers ...Layer) {...} -// Expect a frame with the final layerStates layer matching the provided Layer -// within the timeout specified. If it doesn't arrive in time, it returns nil. -func (conn *Connection) Expect(layer Layer, timeout time.Duration) (Layer, error) {...} -// ExpectFrame expects a frame that matches the provided Layers within the -// timeout specified. If it doesn't arrive in time, it returns nil. -func (conn *Connection) ExpectFrame(layers Layers, timeout time.Duration) (Layers, error) {...} -// Drain drains the sniffer's receive buffer by receiving packets until there's -// nothing else to receive. -func (conn *Connection) Drain() {...} -``` - -`CreateFrame` uses the `[]layerState` to create a frame to send. The first -argument is for overriding defaults in the last header of the frame, because -this is the most common need. For a TCPIPv4 connection, this would be the TCP -header. Optional additionalLayers can be specified to add to the frame being -created, such as a `Payload` for `TCP`. - -`SendFrame` sends the frame to the DUT. It is combined with `CreateFrame` to -make `Send`. For unittests with basic sending needs, `Send` can be used. If more -control is needed over the frame, it can be made with `CreateFrame`, modified in -the unit test, and then sent with `SendFrame`. - -On the receiving side, there is `Expect` and `ExpectFrame`. Like with the -sending side, there are two forms of each function, one for just the last header -and one for the whole frame. The expect functions use the `[]layerState` to -create a template for the expected incoming frame. That frame is then overridden -by the values in the first argument. Finally, a loop starts sniffing packets on -the wire for frames. If a matching frame is found before the timeout, it is -returned without error. If not, nil is returned and the error contains text of -all the received frames that didn't match. Exactly one of the outputs will be -non-nil, even if no frames are received at all. - -`Drain` sniffs and discards all the frames that have yet to be received. A -common way to write a test is: - -```go -conn.Drain() // Discard all outstanding frames. -conn.Send(...) // Send a frame with overrides. -// Now expect a frame with a certain header and fail if it doesn't arrive. -if _, err := conn.Expect(...); err != nil { t.Fatal(...) } -``` - -Or for a test where we want to check that no frame arrives: - -```go -if gotOne, _ := conn.Expect(...); gotOne != nil { t.Fatal(...) } -``` - -#### Specializing `Connection` - -Because there are some common combinations of `layerState` into `Connection`, -they are defined: - -```go -// TCPIPv4 maintains the state for all the layers in a TCP/IPv4 connection. -type TCPIPv4 Connection -// UDPIPv4 maintains the state for all the layers in a UDP/IPv4 connection. -type UDPIPv4 Connection -``` - -Each has a `NewXxx` function to create a new connection with reasonable -defaults. They also have functions that call the underlying `Connection` -functions but with specialization and tighter type-checking. For example: - -```go -func (conn *TCPIPv4) Send(tcp TCP, additionalLayers ...Layer) { - (*Connection)(conn).Send(&tcp, additionalLayers...) -} -func (conn *TCPIPv4) Drain() { - conn.sniffer.Drain() -} -``` - -They may also have some accessors to get or set the internal state of the -connection: - -```go -func (conn *TCPIPv4) state() *tcpState { - state, ok := conn.layerStates[len(conn.layerStates)-1].(*tcpState) - if !ok { - conn.t.Fatalf("expected final state of %v to be tcpState", conn.layerStates) - } - return state -} -func (conn *TCPIPv4) RemoteSeqNum() *seqnum.Value { - return conn.state().remoteSeqNum -} -func (conn *TCPIPv4) LocalSeqNum() *seqnum.Value { - return conn.state().localSeqNum -} -``` - -Unittests will in practice use these functions and not the functions on -`Connection`. For example, `NewTCPIPv4()` and then call `Send` on that rather -than cast is to a `Connection` and call `Send` on that cast result. - -##### Alternatives considered - -* Instead of storing `outgoing` and `incoming`, store values. - * There would be many more things to store instead, like `localMac`, - `remoteMac`, `localIP`, `remoteIP`, `localPort`, and `remotePort`. - * Construction of a packet would be many lines to copy each of these - values into a `[]byte`. And there would be slight variations needed for - each encapsulation stack, like TCPIPv6 and ARP. - * Filtering incoming packets would be a long sequence: - * Compare the MACs, then - * Parse the next header, then - * Compare the IPs, then - * Parse the next header, then - * Compare the TCP ports. Instead it's all just one call to - `cmp.Equal(...)`, for all sequences. - * A TCPIPv6 connection could share most of the code. Only the type of the - IP addresses are different. The types of `outgoing` and `incoming` would - be remain `Layers`. - * An ARP connection could share all the Ethernet parts. The IP `Layer` - could be factored out of `outgoing`. After that, the IPv4 and IPv6 - connections could implement one interface and a single TCP struct could - have either network protocol through composition. - -## Putting it all together - -Here's what te start of a packetimpact unit test looks like. This test creates a -TCP connection with the DUT. There are added comments for explanation in this -document but a real test might not include them in order to stay even more -concise. - -```go -func TestMyTcpTest(t *testing.T) { - // Prepare a DUT for communication. - dut := testbench.NewDUT(t) - - // This does: - // dut.Socket() - // dut.Bind() - // dut.Getsockname() to learn the new port number - // dut.Listen() - listenFD, remotePort := dut.CreateListener(unix.SOCK_STREAM, unix.IPPROTO_TCP, 1) - defer dut.Close(listenFD) // Tell the DUT to close the socket at the end of the test. - - // Monitor a new TCP connection with sniffer, injector, sequence number tracking, - // and reasonable outgoing and incoming packet field default IPs, MACs, and port numbers. - conn := testbench.NewTCPIPv4(t, dut, remotePort) - - // Perform a 3-way handshake: send SYN, expect SYNACK, send ACK. - conn.Handshake() - - // Tell the DUT to accept the new connection. - acceptFD := dut.Accept(acceptFd) -} -``` - -## Other notes - -* The time between receiving a SYN-ACK and replying with an ACK in `Handshake` - is about 3ms. This is much slower than the native unix response, which is - about 0.3ms. Packetdrill gets closer to 0.3ms. For tests where timing is - crucial, packetdrill is faster and more precise. diff --git a/test/packetimpact/dut/BUILD b/test/packetimpact/dut/BUILD deleted file mode 100644 index 3ce63c2c6..000000000 --- a/test/packetimpact/dut/BUILD +++ /dev/null @@ -1,18 +0,0 @@ -load("//tools:defs.bzl", "cc_binary", "grpcpp") - -package( - default_visibility = ["//test/packetimpact:__subpackages__"], - licenses = ["notice"], -) - -cc_binary( - name = "posix_server", - srcs = ["posix_server.cc"], - linkstatic = 1, - static = True, # This is needed for running in a docker container. - deps = [ - grpcpp, - "//test/packetimpact/proto:posix_server_cc_grpc_proto", - "//test/packetimpact/proto:posix_server_cc_proto", - ], -) diff --git a/test/packetimpact/dut/posix_server.cc b/test/packetimpact/dut/posix_server.cc deleted file mode 100644 index a1a5c3612..000000000 --- a/test/packetimpact/dut/posix_server.cc +++ /dev/null @@ -1,365 +0,0 @@ -// Copyright 2020 The gVisor Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at // -// http://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -#include <arpa/inet.h> -#include <fcntl.h> -#include <getopt.h> -#include <netdb.h> -#include <netinet/in.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include <sys/socket.h> -#include <sys/types.h> -#include <unistd.h> - -#include <iostream> -#include <unordered_map> - -#include "include/grpcpp/security/server_credentials.h" -#include "include/grpcpp/server_builder.h" -#include "test/packetimpact/proto/posix_server.grpc.pb.h" -#include "test/packetimpact/proto/posix_server.pb.h" - -// Converts a sockaddr_storage to a Sockaddr message. -::grpc::Status sockaddr_to_proto(const sockaddr_storage &addr, - socklen_t addrlen, - posix_server::Sockaddr *sockaddr_proto) { - switch (addr.ss_family) { - case AF_INET: { - auto addr_in = reinterpret_cast<const sockaddr_in *>(&addr); - auto response_in = sockaddr_proto->mutable_in(); - response_in->set_family(addr_in->sin_family); - response_in->set_port(ntohs(addr_in->sin_port)); - response_in->mutable_addr()->assign( - reinterpret_cast<const char *>(&addr_in->sin_addr.s_addr), 4); - return ::grpc::Status::OK; - } - case AF_INET6: { - auto addr_in6 = reinterpret_cast<const sockaddr_in6 *>(&addr); - auto response_in6 = sockaddr_proto->mutable_in6(); - response_in6->set_family(addr_in6->sin6_family); - response_in6->set_port(ntohs(addr_in6->sin6_port)); - response_in6->set_flowinfo(ntohl(addr_in6->sin6_flowinfo)); - response_in6->mutable_addr()->assign( - reinterpret_cast<const char *>(&addr_in6->sin6_addr.s6_addr), 16); - response_in6->set_scope_id(ntohl(addr_in6->sin6_scope_id)); - return ::grpc::Status::OK; - } - } - return ::grpc::Status(grpc::StatusCode::INVALID_ARGUMENT, "Unknown Sockaddr"); -} - -::grpc::Status proto_to_sockaddr(const posix_server::Sockaddr &sockaddr_proto, - sockaddr_storage *addr, socklen_t *addr_len) { - switch (sockaddr_proto.sockaddr_case()) { - case posix_server::Sockaddr::SockaddrCase::kIn: { - auto proto_in = sockaddr_proto.in(); - if (proto_in.addr().size() != 4) { - return ::grpc::Status(grpc::StatusCode::INVALID_ARGUMENT, - "IPv4 address must be 4 bytes"); - } - auto addr_in = reinterpret_cast<sockaddr_in *>(addr); - addr_in->sin_family = proto_in.family(); - addr_in->sin_port = htons(proto_in.port()); - proto_in.addr().copy(reinterpret_cast<char *>(&addr_in->sin_addr.s_addr), - 4); - *addr_len = sizeof(*addr_in); - break; - } - case posix_server::Sockaddr::SockaddrCase::kIn6: { - auto proto_in6 = sockaddr_proto.in6(); - if (proto_in6.addr().size() != 16) { - return ::grpc::Status(grpc::StatusCode::INVALID_ARGUMENT, - "IPv6 address must be 16 bytes"); - } - auto addr_in6 = reinterpret_cast<sockaddr_in6 *>(addr); - addr_in6->sin6_family = proto_in6.family(); - addr_in6->sin6_port = htons(proto_in6.port()); - addr_in6->sin6_flowinfo = htonl(proto_in6.flowinfo()); - proto_in6.addr().copy( - reinterpret_cast<char *>(&addr_in6->sin6_addr.s6_addr), 16); - addr_in6->sin6_scope_id = htonl(proto_in6.scope_id()); - *addr_len = sizeof(*addr_in6); - break; - } - case posix_server::Sockaddr::SockaddrCase::SOCKADDR_NOT_SET: - default: - return ::grpc::Status(grpc::StatusCode::INVALID_ARGUMENT, - "Unknown Sockaddr"); - } - return ::grpc::Status::OK; -} - -class PosixImpl final : public posix_server::Posix::Service { - ::grpc::Status Accept(grpc_impl::ServerContext *context, - const ::posix_server::AcceptRequest *request, - ::posix_server::AcceptResponse *response) override { - sockaddr_storage addr; - socklen_t addrlen = sizeof(addr); - response->set_fd(accept(request->sockfd(), - reinterpret_cast<sockaddr *>(&addr), &addrlen)); - response->set_errno_(errno); - return sockaddr_to_proto(addr, addrlen, response->mutable_addr()); - } - - ::grpc::Status Bind(grpc_impl::ServerContext *context, - const ::posix_server::BindRequest *request, - ::posix_server::BindResponse *response) override { - if (!request->has_addr()) { - return ::grpc::Status(grpc::StatusCode::INVALID_ARGUMENT, - "Missing address"); - } - - sockaddr_storage addr; - socklen_t addr_len; - auto err = proto_to_sockaddr(request->addr(), &addr, &addr_len); - if (!err.ok()) { - return err; - } - - response->set_ret( - bind(request->sockfd(), reinterpret_cast<sockaddr *>(&addr), addr_len)); - response->set_errno_(errno); - return ::grpc::Status::OK; - } - - ::grpc::Status Close(grpc_impl::ServerContext *context, - const ::posix_server::CloseRequest *request, - ::posix_server::CloseResponse *response) override { - response->set_ret(close(request->fd())); - response->set_errno_(errno); - return ::grpc::Status::OK; - } - - ::grpc::Status Connect(grpc_impl::ServerContext *context, - const ::posix_server::ConnectRequest *request, - ::posix_server::ConnectResponse *response) override { - if (!request->has_addr()) { - return ::grpc::Status(grpc::StatusCode::INVALID_ARGUMENT, - "Missing address"); - } - sockaddr_storage addr; - socklen_t addr_len; - auto err = proto_to_sockaddr(request->addr(), &addr, &addr_len); - if (!err.ok()) { - return err; - } - - response->set_ret(connect(request->sockfd(), - reinterpret_cast<sockaddr *>(&addr), addr_len)); - response->set_errno_(errno); - return ::grpc::Status::OK; - } - - ::grpc::Status Fcntl(grpc_impl::ServerContext *context, - const ::posix_server::FcntlRequest *request, - ::posix_server::FcntlResponse *response) override { - response->set_ret(::fcntl(request->fd(), request->cmd(), request->arg())); - response->set_errno_(errno); - return ::grpc::Status::OK; - } - - ::grpc::Status GetSockName( - grpc_impl::ServerContext *context, - const ::posix_server::GetSockNameRequest *request, - ::posix_server::GetSockNameResponse *response) override { - sockaddr_storage addr; - socklen_t addrlen = sizeof(addr); - response->set_ret(getsockname( - request->sockfd(), reinterpret_cast<sockaddr *>(&addr), &addrlen)); - response->set_errno_(errno); - return sockaddr_to_proto(addr, addrlen, response->mutable_addr()); - } - - ::grpc::Status GetSockOpt( - grpc_impl::ServerContext *context, - const ::posix_server::GetSockOptRequest *request, - ::posix_server::GetSockOptResponse *response) override { - switch (request->type()) { - case ::posix_server::GetSockOptRequest::BYTES: { - socklen_t optlen = request->optlen(); - std::vector<char> buf(optlen); - response->set_ret(::getsockopt(request->sockfd(), request->level(), - request->optname(), buf.data(), - &optlen)); - if (optlen >= 0) { - response->mutable_optval()->set_bytesval(buf.data(), optlen); - } - break; - } - case ::posix_server::GetSockOptRequest::INT: { - int intval = 0; - socklen_t optlen = sizeof(intval); - response->set_ret(::getsockopt(request->sockfd(), request->level(), - request->optname(), &intval, &optlen)); - response->mutable_optval()->set_intval(intval); - break; - } - case ::posix_server::GetSockOptRequest::TIME: { - timeval tv; - socklen_t optlen = sizeof(tv); - response->set_ret(::getsockopt(request->sockfd(), request->level(), - request->optname(), &tv, &optlen)); - response->mutable_optval()->mutable_timeval()->set_seconds(tv.tv_sec); - response->mutable_optval()->mutable_timeval()->set_microseconds( - tv.tv_usec); - break; - } - default: - return ::grpc::Status(grpc::StatusCode::INVALID_ARGUMENT, - "Unknown SockOpt Type"); - } - response->set_errno_(errno); - return ::grpc::Status::OK; - } - - ::grpc::Status Listen(grpc_impl::ServerContext *context, - const ::posix_server::ListenRequest *request, - ::posix_server::ListenResponse *response) override { - response->set_ret(listen(request->sockfd(), request->backlog())); - response->set_errno_(errno); - return ::grpc::Status::OK; - } - - ::grpc::Status Send(::grpc::ServerContext *context, - const ::posix_server::SendRequest *request, - ::posix_server::SendResponse *response) override { - response->set_ret(::send(request->sockfd(), request->buf().data(), - request->buf().size(), request->flags())); - response->set_errno_(errno); - return ::grpc::Status::OK; - } - - ::grpc::Status SendTo(::grpc::ServerContext *context, - const ::posix_server::SendToRequest *request, - ::posix_server::SendToResponse *response) override { - if (!request->has_dest_addr()) { - return ::grpc::Status(grpc::StatusCode::INVALID_ARGUMENT, - "Missing address"); - } - sockaddr_storage addr; - socklen_t addr_len; - auto err = proto_to_sockaddr(request->dest_addr(), &addr, &addr_len); - if (!err.ok()) { - return err; - } - - response->set_ret(::sendto(request->sockfd(), request->buf().data(), - request->buf().size(), request->flags(), - reinterpret_cast<sockaddr *>(&addr), addr_len)); - response->set_errno_(errno); - return ::grpc::Status::OK; - } - - ::grpc::Status SetSockOpt( - grpc_impl::ServerContext *context, - const ::posix_server::SetSockOptRequest *request, - ::posix_server::SetSockOptResponse *response) override { - switch (request->optval().val_case()) { - case ::posix_server::SockOptVal::kBytesval: - response->set_ret(setsockopt(request->sockfd(), request->level(), - request->optname(), - request->optval().bytesval().c_str(), - request->optval().bytesval().size())); - break; - case ::posix_server::SockOptVal::kIntval: { - int opt = request->optval().intval(); - response->set_ret(::setsockopt(request->sockfd(), request->level(), - request->optname(), &opt, sizeof(opt))); - break; - } - case ::posix_server::SockOptVal::kTimeval: { - timeval tv = {.tv_sec = static_cast<__time_t>( - request->optval().timeval().seconds()), - .tv_usec = static_cast<__suseconds_t>( - request->optval().timeval().microseconds())}; - response->set_ret(setsockopt(request->sockfd(), request->level(), - request->optname(), &tv, sizeof(tv))); - break; - } - default: - return ::grpc::Status(grpc::StatusCode::INVALID_ARGUMENT, - "Unknown SockOpt Type"); - } - response->set_errno_(errno); - return ::grpc::Status::OK; - } - - ::grpc::Status Socket(grpc_impl::ServerContext *context, - const ::posix_server::SocketRequest *request, - ::posix_server::SocketResponse *response) override { - response->set_fd( - socket(request->domain(), request->type(), request->protocol())); - response->set_errno_(errno); - return ::grpc::Status::OK; - } - - ::grpc::Status Recv(::grpc::ServerContext *context, - const ::posix_server::RecvRequest *request, - ::posix_server::RecvResponse *response) override { - std::vector<char> buf(request->len()); - response->set_ret( - recv(request->sockfd(), buf.data(), buf.size(), request->flags())); - if (response->ret() >= 0) { - response->set_buf(buf.data(), response->ret()); - } - response->set_errno_(errno); - return ::grpc::Status::OK; - } -}; - -// Parse command line options. Returns a pointer to the first argument beyond -// the options. -void parse_command_line_options(int argc, char *argv[], std::string *ip, - int *port) { - static struct option options[] = {{"ip", required_argument, NULL, 1}, - {"port", required_argument, NULL, 2}, - {0, 0, 0, 0}}; - - // Parse the arguments. - int c; - while ((c = getopt_long(argc, argv, "", options, NULL)) > 0) { - if (c == 1) { - *ip = optarg; - } else if (c == 2) { - *port = std::stoi(std::string(optarg)); - } - } -} - -void run_server(const std::string &ip, int port) { - PosixImpl posix_service; - grpc::ServerBuilder builder; - std::string server_address = ip + ":" + std::to_string(port); - // Set the authentication mechanism. - std::shared_ptr<grpc::ServerCredentials> creds = - grpc::InsecureServerCredentials(); - builder.AddListeningPort(server_address, creds); - builder.RegisterService(&posix_service); - - std::unique_ptr<grpc::Server> server(builder.BuildAndStart()); - std::cerr << "Server listening on " << server_address << std::endl; - server->Wait(); - std::cerr << "posix_server is finished." << std::endl; -} - -int main(int argc, char *argv[]) { - std::cerr << "posix_server is starting." << std::endl; - std::string ip; - int port; - parse_command_line_options(argc, argv, &ip, &port); - - std::cerr << "Got IP " << ip << " and port " << port << "." << std::endl; - run_server(ip, port); -} diff --git a/test/packetimpact/netdevs/BUILD b/test/packetimpact/netdevs/BUILD deleted file mode 100644 index 422bb9b0c..000000000 --- a/test/packetimpact/netdevs/BUILD +++ /dev/null @@ -1,15 +0,0 @@ -load("//tools:defs.bzl", "go_library") - -package( - licenses = ["notice"], -) - -go_library( - name = "netdevs", - srcs = ["netdevs.go"], - visibility = ["//test/packetimpact:__subpackages__"], - deps = [ - "//pkg/tcpip", - "//pkg/tcpip/header", - ], -) diff --git a/test/packetimpact/netdevs/netdevs.go b/test/packetimpact/netdevs/netdevs.go deleted file mode 100644 index d2c9cfeaf..000000000 --- a/test/packetimpact/netdevs/netdevs.go +++ /dev/null @@ -1,104 +0,0 @@ -// Copyright 2020 The gVisor Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// http://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -// Package netdevs contains utilities for working with network devices. -package netdevs - -import ( - "fmt" - "net" - "regexp" - "strings" - - "gvisor.dev/gvisor/pkg/tcpip" - "gvisor.dev/gvisor/pkg/tcpip/header" -) - -// A DeviceInfo represents a network device. -type DeviceInfo struct { - MAC net.HardwareAddr - IPv4Addr net.IP - IPv4Net *net.IPNet - IPv6Addr net.IP - IPv6Net *net.IPNet -} - -var ( - deviceLine = regexp.MustCompile(`^\s*\d+: (\w+)`) - linkLine = regexp.MustCompile(`^\s*link/\w+ ([0-9a-fA-F:]+)`) - inetLine = regexp.MustCompile(`^\s*inet ([0-9./]+)`) - inet6Line = regexp.MustCompile(`^\s*inet6 ([0-9a-fA-Z:/]+)`) -) - -// ParseDevices parses the output from `ip addr show` into a map from device -// name to information about the device. -func ParseDevices(cmdOutput string) (map[string]DeviceInfo, error) { - var currentDevice string - var currentInfo DeviceInfo - deviceInfos := make(map[string]DeviceInfo) - for _, line := range strings.Split(cmdOutput, "\n") { - if m := deviceLine.FindStringSubmatch(line); m != nil { - if currentDevice != "" { - deviceInfos[currentDevice] = currentInfo - } - currentInfo = DeviceInfo{} - currentDevice = m[1] - } else if m := linkLine.FindStringSubmatch(line); m != nil { - mac, err := net.ParseMAC(m[1]) - if err != nil { - return nil, err - } - currentInfo.MAC = mac - } else if m := inetLine.FindStringSubmatch(line); m != nil { - ipv4Addr, ipv4Net, err := net.ParseCIDR(m[1]) - if err != nil { - return nil, err - } - currentInfo.IPv4Addr = ipv4Addr - currentInfo.IPv4Net = ipv4Net - } else if m := inet6Line.FindStringSubmatch(line); m != nil { - ipv6Addr, ipv6Net, err := net.ParseCIDR(m[1]) - if err != nil { - return nil, err - } - currentInfo.IPv6Addr = ipv6Addr - currentInfo.IPv6Net = ipv6Net - } - } - if currentDevice != "" { - deviceInfos[currentDevice] = currentInfo - } - return deviceInfos, nil -} - -// MACToIP converts the MAC address to an IPv6 link local address as described -// in RFC 4291 page 20: https://tools.ietf.org/html/rfc4291#page-20 -func MACToIP(mac net.HardwareAddr) net.IP { - addr := make([]byte, header.IPv6AddressSize) - addr[0] = 0xfe - addr[1] = 0x80 - header.EthernetAdddressToModifiedEUI64IntoBuf(tcpip.LinkAddress(mac), addr[8:]) - return net.IP(addr) -} - -// FindDeviceByIP finds a DeviceInfo and device name from an IP address in the -// output of ParseDevices. -func FindDeviceByIP(ip net.IP, devices map[string]DeviceInfo) (string, DeviceInfo, error) { - for dev, info := range devices { - if info.IPv4Addr.Equal(ip) { - return dev, info, nil - } - } - return "", DeviceInfo{}, fmt.Errorf("can't find %s on any interface", ip) -} diff --git a/test/packetimpact/proto/BUILD b/test/packetimpact/proto/BUILD deleted file mode 100644 index 4a4370f42..000000000 --- a/test/packetimpact/proto/BUILD +++ /dev/null @@ -1,12 +0,0 @@ -load("//tools:defs.bzl", "proto_library") - -package( - default_visibility = ["//test/packetimpact:__subpackages__"], - licenses = ["notice"], -) - -proto_library( - name = "posix_server", - srcs = ["posix_server.proto"], - has_services = 1, -) diff --git a/test/packetimpact/proto/posix_server.proto b/test/packetimpact/proto/posix_server.proto deleted file mode 100644 index ccd20b10d..000000000 --- a/test/packetimpact/proto/posix_server.proto +++ /dev/null @@ -1,230 +0,0 @@ -// Copyright 2020 The gVisor Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// http://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -syntax = "proto3"; - -package posix_server; - -message SockaddrIn { - int32 family = 1; - uint32 port = 2; - bytes addr = 3; -} - -message SockaddrIn6 { - uint32 family = 1; - uint32 port = 2; - uint32 flowinfo = 3; - bytes addr = 4; - uint32 scope_id = 5; -} - -message Sockaddr { - oneof sockaddr { - SockaddrIn in = 1; - SockaddrIn6 in6 = 2; - } -} - -message Timeval { - int64 seconds = 1; - int64 microseconds = 2; -} - -message SockOptVal { - oneof val { - bytes bytesval = 1; - int32 intval = 2; - Timeval timeval = 3; - } -} - -// Request and Response pairs for each Posix service RPC call, sorted. - -message AcceptRequest { - int32 sockfd = 1; -} - -message AcceptResponse { - int32 fd = 1; - int32 errno_ = 2; // "errno" may fail to compile in c++. - Sockaddr addr = 3; -} - -message BindRequest { - int32 sockfd = 1; - Sockaddr addr = 2; -} - -message BindResponse { - int32 ret = 1; - int32 errno_ = 2; // "errno" may fail to compile in c++. -} - -message CloseRequest { - int32 fd = 1; -} - -message CloseResponse { - int32 ret = 1; - int32 errno_ = 2; // "errno" may fail to compile in c++. -} - -message ConnectRequest { - int32 sockfd = 1; - Sockaddr addr = 2; -} - -message ConnectResponse { - int32 ret = 1; - int32 errno_ = 2; // "errno" may fail to compile in c++. -} - -message FcntlRequest { - int32 fd = 1; - int32 cmd = 2; - int32 arg = 3; -} - -message FcntlResponse { - int32 ret = 1; - int32 errno_ = 2; -} - -message GetSockNameRequest { - int32 sockfd = 1; -} - -message GetSockNameResponse { - int32 ret = 1; - int32 errno_ = 2; // "errno" may fail to compile in c++. - Sockaddr addr = 3; -} - -message GetSockOptRequest { - int32 sockfd = 1; - int32 level = 2; - int32 optname = 3; - int32 optlen = 4; - enum SockOptType { - UNSPECIFIED = 0; - BYTES = 1; - INT = 2; - TIME = 3; - } - SockOptType type = 5; -} - -message GetSockOptResponse { - int32 ret = 1; - int32 errno_ = 2; // "errno" may fail to compile in c++. - SockOptVal optval = 3; -} - -message ListenRequest { - int32 sockfd = 1; - int32 backlog = 2; -} - -message ListenResponse { - int32 ret = 1; - int32 errno_ = 2; // "errno" may fail to compile in c++. -} - -message SendRequest { - int32 sockfd = 1; - bytes buf = 2; - int32 flags = 3; -} - -message SendResponse { - int32 ret = 1; - int32 errno_ = 2; // "errno" may fail to compile in c++. -} - -message SendToRequest { - int32 sockfd = 1; - bytes buf = 2; - int32 flags = 3; - Sockaddr dest_addr = 4; -} - -message SendToResponse { - int32 ret = 1; - int32 errno_ = 2; // "errno" may fail to compile in c++. -} - -message SetSockOptRequest { - int32 sockfd = 1; - int32 level = 2; - int32 optname = 3; - SockOptVal optval = 4; -} - -message SetSockOptResponse { - int32 ret = 1; - int32 errno_ = 2; // "errno" may fail to compile in c++. -} - -message SocketRequest { - int32 domain = 1; - int32 type = 2; - int32 protocol = 3; -} - -message SocketResponse { - int32 fd = 1; - int32 errno_ = 2; // "errno" may fail to compile in c++. -} - -message RecvRequest { - int32 sockfd = 1; - int32 len = 2; - int32 flags = 3; -} - -message RecvResponse { - int32 ret = 1; - int32 errno_ = 2; // "errno" may fail to compile in c++. - bytes buf = 3; -} - -service Posix { - // Call accept() on the DUT. - rpc Accept(AcceptRequest) returns (AcceptResponse); - // Call bind() on the DUT. - rpc Bind(BindRequest) returns (BindResponse); - // Call close() on the DUT. - rpc Close(CloseRequest) returns (CloseResponse); - // Call connect() on the DUT. - rpc Connect(ConnectRequest) returns (ConnectResponse); - // Call fcntl() on the DUT. - rpc Fcntl(FcntlRequest) returns (FcntlResponse); - // Call getsockname() on the DUT. - rpc GetSockName(GetSockNameRequest) returns (GetSockNameResponse); - // Call getsockopt() on the DUT. - rpc GetSockOpt(GetSockOptRequest) returns (GetSockOptResponse); - // Call listen() on the DUT. - rpc Listen(ListenRequest) returns (ListenResponse); - // Call send() on the DUT. - rpc Send(SendRequest) returns (SendResponse); - // Call sendto() on the DUT. - rpc SendTo(SendToRequest) returns (SendToResponse); - // Call setsockopt() on the DUT. - rpc SetSockOpt(SetSockOptRequest) returns (SetSockOptResponse); - // Call socket() on the DUT. - rpc Socket(SocketRequest) returns (SocketResponse); - // Call recv() on the DUT. - rpc Recv(RecvRequest) returns (RecvResponse); -} diff --git a/test/packetimpact/runner/BUILD b/test/packetimpact/runner/BUILD deleted file mode 100644 index 0b68a760a..000000000 --- a/test/packetimpact/runner/BUILD +++ /dev/null @@ -1,20 +0,0 @@ -load("//tools:defs.bzl", "go_test") - -package( - default_visibility = ["//test/packetimpact:__subpackages__"], - licenses = ["notice"], -) - -go_test( - name = "packetimpact_test", - srcs = ["packetimpact_test.go"], - tags = [ - # Not intended to be run directly. - "local", - "manual", - ], - deps = [ - "//pkg/test/dockerutil", - "//test/packetimpact/netdevs", - ], -) diff --git a/test/packetimpact/runner/defs.bzl b/test/packetimpact/runner/defs.bzl deleted file mode 100644 index 77cdfea12..000000000 --- a/test/packetimpact/runner/defs.bzl +++ /dev/null @@ -1,136 +0,0 @@ -"""Defines rules for packetimpact test targets.""" - -load("//tools:defs.bzl", "go_test") - -def _packetimpact_test_impl(ctx): - test_runner = ctx.executable._test_runner - bench = ctx.actions.declare_file("%s-bench" % ctx.label.name) - bench_content = "\n".join([ - "#!/bin/bash", - # This test will run part in a distinct user namespace. This can cause - # permission problems, because all runfiles may not be owned by the - # current user, and no other users will be mapped in that namespace. - # Make sure that everything is readable here. - "find . -type f -or -type d -exec chmod a+rx {} \\;", - "%s %s --testbench_binary %s $@\n" % ( - test_runner.short_path, - " ".join(ctx.attr.flags), - ctx.files.testbench_binary[0].short_path, - ), - ]) - ctx.actions.write(bench, bench_content, is_executable = True) - - transitive_files = [] - if hasattr(ctx.attr._test_runner, "data_runfiles"): - transitive_files.append(ctx.attr._test_runner.data_runfiles.files) - runfiles = ctx.runfiles( - files = [test_runner] + ctx.files.testbench_binary + ctx.files._posix_server_binary, - transitive_files = depset(transitive = transitive_files), - collect_default = True, - collect_data = True, - ) - return [DefaultInfo(executable = bench, runfiles = runfiles)] - -_packetimpact_test = rule( - attrs = { - "_test_runner": attr.label( - executable = True, - cfg = "target", - default = ":packetimpact_test", - ), - "_posix_server_binary": attr.label( - cfg = "target", - default = "//test/packetimpact/dut:posix_server", - ), - "testbench_binary": attr.label( - cfg = "target", - mandatory = True, - ), - "flags": attr.string_list( - mandatory = False, - default = [], - ), - }, - test = True, - implementation = _packetimpact_test_impl, -) - -PACKETIMPACT_TAGS = ["local", "manual"] - -def packetimpact_linux_test( - name, - testbench_binary, - expect_failure = False, - **kwargs): - """Add a packetimpact test on linux. - - Args: - name: name of the test - testbench_binary: the testbench binary - expect_failure: the test must fail - **kwargs: all the other args, forwarded to _packetimpact_test - """ - expect_failure_flag = ["--expect_failure"] if expect_failure else [] - _packetimpact_test( - name = name + "_linux_test", - testbench_binary = testbench_binary, - flags = ["--dut_platform", "linux"] + expect_failure_flag, - tags = PACKETIMPACT_TAGS + ["packetimpact"], - **kwargs - ) - -def packetimpact_netstack_test( - name, - testbench_binary, - expect_failure = False, - **kwargs): - """Add a packetimpact test on netstack. - - Args: - name: name of the test - testbench_binary: the testbench binary - expect_failure: the test must fail - **kwargs: all the other args, forwarded to _packetimpact_test - """ - expect_failure_flag = [] - if expect_failure: - expect_failure_flag = ["--expect_failure"] - _packetimpact_test( - name = name + "_netstack_test", - testbench_binary = testbench_binary, - # This is the default runtime unless - # "--test_arg=--runtime=OTHER_RUNTIME" is used to override the value. - flags = ["--dut_platform", "netstack", "--runtime=runsc-d"] + expect_failure_flag, - tags = PACKETIMPACT_TAGS + ["packetimpact"], - **kwargs - ) - -def packetimpact_go_test(name, size = "small", pure = True, expect_linux_failure = False, expect_netstack_failure = False, **kwargs): - """Add packetimpact tests written in go. - - Args: - name: name of the test - size: size of the test - pure: make a static go binary - expect_linux_failure: the test must fail for Linux - expect_netstack_failure: the test must fail for Netstack - **kwargs: all the other args, forwarded to go_test - """ - testbench_binary = name + "_test" - go_test( - name = testbench_binary, - size = size, - pure = pure, - tags = PACKETIMPACT_TAGS, - **kwargs - ) - packetimpact_linux_test( - name = name, - expect_failure = expect_linux_failure, - testbench_binary = testbench_binary, - ) - packetimpact_netstack_test( - name = name, - expect_failure = expect_netstack_failure, - testbench_binary = testbench_binary, - ) diff --git a/test/packetimpact/runner/packetimpact_test.go b/test/packetimpact/runner/packetimpact_test.go deleted file mode 100644 index c0a2620de..000000000 --- a/test/packetimpact/runner/packetimpact_test.go +++ /dev/null @@ -1,345 +0,0 @@ -// Copyright 2020 The gVisor Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// http://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -// The runner starts docker containers and networking for a packetimpact test. -package packetimpact_test - -import ( - "flag" - "fmt" - "io/ioutil" - "log" - "math/rand" - "net" - "os" - "os/exec" - "path" - "strings" - "testing" - "time" - - "gvisor.dev/gvisor/pkg/test/dockerutil" - "gvisor.dev/gvisor/test/packetimpact/netdevs" -) - -// stringList implements flag.Value. -type stringList []string - -// String implements flag.Value.String. -func (l *stringList) String() string { - return strings.Join(*l, ",") -} - -// Set implements flag.Value.Set. -func (l *stringList) Set(value string) error { - *l = append(*l, value) - return nil -} - -var ( - dutPlatform = flag.String("dut_platform", "", "either \"linux\" or \"netstack\"") - testbenchBinary = flag.String("testbench_binary", "", "path to the testbench binary") - tshark = flag.Bool("tshark", false, "use more verbose tshark in logs instead of tcpdump") - extraTestArgs = stringList{} - expectFailure = flag.Bool("expect_failure", false, "expect that the test will fail when run") - - dutAddr = net.IPv4(0, 0, 0, 10) - testbenchAddr = net.IPv4(0, 0, 0, 20) -) - -const ctrlPort = "40000" - -// logger implements testutil.Logger. -// -// Labels logs based on their source and formats multi-line logs. -type logger string - -// Name implements testutil.Logger.Name. -func (l logger) Name() string { - return string(l) -} - -// Logf implements testutil.Logger.Logf. -func (l logger) Logf(format string, args ...interface{}) { - lines := strings.Split(fmt.Sprintf(format, args...), "\n") - log.Printf("%s: %s", l, lines[0]) - for _, line := range lines[1:] { - log.Printf("%*s %s", len(l), "", line) - } -} - -func TestOne(t *testing.T) { - flag.Var(&extraTestArgs, "extra_test_arg", "extra arguments to pass to the testbench") - flag.Parse() - if *dutPlatform != "linux" && *dutPlatform != "netstack" { - t.Fatal("--dut_platform should be either linux or netstack") - } - if *testbenchBinary == "" { - t.Fatal("--testbench_binary is missing") - } - if *dutPlatform == "netstack" { - if _, err := dockerutil.RuntimePath(); err != nil { - t.Fatal("--runtime is missing or invalid with --dut_platform=netstack:", err) - } - } - dockerutil.EnsureSupportedDockerVersion() - - // Create the networks needed for the test. One control network is needed for - // the gRPC control packets and one test network on which to transmit the test - // packets. - ctrlNet := dockerutil.NewDockerNetwork(logger("ctrlNet")) - testNet := dockerutil.NewDockerNetwork(logger("testNet")) - for _, dn := range []*dockerutil.DockerNetwork{ctrlNet, testNet} { - for { - if err := createDockerNetwork(dn); err != nil { - t.Log("creating docker network:", err) - const wait = 100 * time.Millisecond - t.Logf("sleeping %s and will try creating docker network again", wait) - // This can fail if another docker network claimed the same IP so we'll - // just try again. - time.Sleep(wait) - continue - } - break - } - defer func(dn *dockerutil.DockerNetwork) { - if err := dn.Cleanup(); err != nil { - t.Errorf("unable to cleanup container %s: %s", dn.Name, err) - } - }(dn) - } - - tmpDir, err := ioutil.TempDir("", "container-output") - if err != nil { - t.Fatal("creating temp dir:", err) - } - defer os.RemoveAll(tmpDir) - - const testOutputDir = "/tmp/testoutput" - - runOpts := dockerutil.RunOpts{ - Image: "packetimpact", - CapAdd: []string{"NET_ADMIN"}, - Extra: []string{"--sysctl", "net.ipv6.conf.all.disable_ipv6=0", "--rm", "-v", tmpDir + ":" + testOutputDir}, - Foreground: true, - } - - // Create the Docker container for the DUT. - dut := dockerutil.MakeDocker(logger("dut")) - if *dutPlatform == "linux" { - dut.Runtime = "" - } - - const containerPosixServerBinary = "/packetimpact/posix_server" - dut.CopyFiles(&runOpts, "/packetimpact", "/test/packetimpact/dut/posix_server") - - if err := dut.Create(runOpts, containerPosixServerBinary, "--ip=0.0.0.0", "--port="+ctrlPort); err != nil { - t.Fatalf("unable to create container %s: %s", dut.Name, err) - } - defer dut.CleanUp() - - // Add ctrlNet as eth1 and testNet as eth2. - const testNetDev = "eth2" - if err := addNetworks(dut, dutAddr, []*dockerutil.DockerNetwork{ctrlNet, testNet}); err != nil { - t.Fatal(err) - } - - if err := dut.Start(); err != nil { - t.Fatalf("unable to start container %s: %s", dut.Name, err) - } - - if _, err := dut.WaitForOutput("Server listening.*\n", 60*time.Second); err != nil { - t.Fatalf("%s on container %s never listened: %s", containerPosixServerBinary, dut.Name, err) - } - - dutTestDevice, dutDeviceInfo, err := deviceByIP(dut, addressInSubnet(dutAddr, *testNet.Subnet)) - if err != nil { - t.Fatal(err) - } - - remoteMAC := dutDeviceInfo.MAC - remoteIPv6 := dutDeviceInfo.IPv6Addr - // Netstack as DUT doesn't assign IPv6 addresses automatically so do it if - // needed. - if remoteIPv6 == nil { - if _, err := dut.Exec(dockerutil.RunOpts{}, "ip", "addr", "add", netdevs.MACToIP(remoteMAC).String(), "scope", "link", "dev", dutTestDevice); err != nil { - t.Fatalf("unable to ip addr add on container %s: %s", dut.Name, err) - } - // Now try again, to make sure that it worked. - _, dutDeviceInfo, err = deviceByIP(dut, addressInSubnet(dutAddr, *testNet.Subnet)) - if err != nil { - t.Fatal(err) - } - remoteIPv6 = dutDeviceInfo.IPv6Addr - if remoteIPv6 == nil { - t.Fatal("unable to set IPv6 address on container", dut.Name) - } - } - - // Create the Docker container for the testbench. - testbench := dockerutil.MakeDocker(logger("testbench")) - testbench.Runtime = "" // The testbench always runs on Linux. - - tbb := path.Base(*testbenchBinary) - containerTestbenchBinary := "/packetimpact/" + tbb - runOpts = dockerutil.RunOpts{ - Image: "packetimpact", - CapAdd: []string{"NET_ADMIN"}, - Extra: []string{"--sysctl", "net.ipv6.conf.all.disable_ipv6=0", "--rm", "-v", tmpDir + ":" + testOutputDir}, - Foreground: true, - } - testbench.CopyFiles(&runOpts, "/packetimpact", "/test/packetimpact/tests/"+tbb) - - // Run tcpdump in the test bench unbuffered, without DNS resolution, just on - // the interface with the test packets. - snifferArgs := []string{ - "tcpdump", - "-S", "-vvv", "-U", "-n", - "-i", testNetDev, - "-w", testOutputDir + "/dump.pcap", - } - snifferRegex := "tcpdump: listening.*\n" - if *tshark { - // Run tshark in the test bench unbuffered, without DNS resolution, just on - // the interface with the test packets. - snifferArgs = []string{ - "tshark", "-V", "-l", "-n", "-i", testNetDev, - "-o", "tcp.check_checksum:TRUE", - "-o", "udp.check_checksum:TRUE", - } - snifferRegex = "Capturing on.*\n" - } - - defer func() { - if err := exec.Command("/bin/cp", "-r", tmpDir, os.Getenv("TEST_UNDECLARED_OUTPUTS_DIR")).Run(); err != nil { - t.Error("unable to copy container output files:", err) - } - }() - - if err := testbench.Create(runOpts, snifferArgs...); err != nil { - t.Fatalf("unable to create container %s: %s", testbench.Name, err) - } - defer testbench.CleanUp() - - // Add ctrlNet as eth1 and testNet as eth2. - if err := addNetworks(testbench, testbenchAddr, []*dockerutil.DockerNetwork{ctrlNet, testNet}); err != nil { - t.Fatal(err) - } - - if err := testbench.Start(); err != nil { - t.Fatalf("unable to start container %s: %s", testbench.Name, err) - } - - // Kill so that it will flush output. - defer func() { - // Wait 1 second before killing tcpdump to give it time to flush - // any packets. On linux tests killing it immediately can - // sometimes result in partial pcaps. - time.Sleep(1 * time.Second) - testbench.Exec(dockerutil.RunOpts{}, "killall", snifferArgs[0]) - }() - - if _, err := testbench.WaitForOutput(snifferRegex, 60*time.Second); err != nil { - t.Fatalf("sniffer on %s never listened: %s", dut.Name, err) - } - - // Because the Linux kernel receives the SYN-ACK but didn't send the SYN it - // will issue a RST. To prevent this IPtables can be used to filter out all - // incoming packets. The raw socket that packetimpact tests use will still see - // everything. - if _, err := testbench.Exec(dockerutil.RunOpts{}, "iptables", "-A", "INPUT", "-i", testNetDev, "-j", "DROP"); err != nil { - t.Fatalf("unable to Exec iptables on container %s: %s", testbench.Name, err) - } - - // FIXME(b/156449515): Some piece of the system has a race. The old - // bash script version had a sleep, so we have one too. The race should - // be fixed and this sleep removed. - time.Sleep(time.Second) - - // Start a packetimpact test on the test bench. The packetimpact test sends - // and receives packets and also sends POSIX socket commands to the - // posix_server to be executed on the DUT. - testArgs := []string{containerTestbenchBinary} - testArgs = append(testArgs, extraTestArgs...) - testArgs = append(testArgs, - "--posix_server_ip", addressInSubnet(dutAddr, *ctrlNet.Subnet).String(), - "--posix_server_port", ctrlPort, - "--remote_ipv4", addressInSubnet(dutAddr, *testNet.Subnet).String(), - "--local_ipv4", addressInSubnet(testbenchAddr, *testNet.Subnet).String(), - "--remote_ipv6", remoteIPv6.String(), - "--remote_mac", remoteMAC.String(), - "--device", testNetDev, - "--dut_type", *dutPlatform, - ) - _, err = testbench.Exec(dockerutil.RunOpts{}, testArgs...) - if !*expectFailure && err != nil { - t.Fatal("test failed:", err) - } - if *expectFailure && err == nil { - t.Fatal("test failure expected but the test succeeded, enable the test and mark the corresponding bug as fixed") - } -} - -func addNetworks(d *dockerutil.Docker, addr net.IP, networks []*dockerutil.DockerNetwork) error { - for _, dn := range networks { - ip := addressInSubnet(addr, *dn.Subnet) - // Connect to the network with the specified IP address. - if err := dn.Connect(d, "--ip", ip.String()); err != nil { - return fmt.Errorf("unable to connect container %s to network %s: %w", d.Name, dn.Name, err) - } - } - return nil -} - -// addressInSubnet combines the subnet provided with the address and returns a -// new address. The return address bits come from the subnet where the mask is 1 -// and from the ip address where the mask is 0. -func addressInSubnet(addr net.IP, subnet net.IPNet) net.IP { - var octets []byte - for i := 0; i < 4; i++ { - octets = append(octets, (subnet.IP.To4()[i]&subnet.Mask[i])+(addr.To4()[i]&(^subnet.Mask[i]))) - } - return net.IP(octets) -} - -// makeDockerNetwork makes a randomly-named network that will start with the -// namePrefix. The network will be a random /24 subnet. -func createDockerNetwork(n *dockerutil.DockerNetwork) error { - randSource := rand.NewSource(time.Now().UnixNano()) - r1 := rand.New(randSource) - // Class C, 192.0.0.0 to 223.255.255.255, transitionally has mask 24. - ip := net.IPv4(byte(r1.Intn(224-192)+192), byte(r1.Intn(256)), byte(r1.Intn(256)), 0) - n.Subnet = &net.IPNet{ - IP: ip, - Mask: ip.DefaultMask(), - } - return n.Create() -} - -// deviceByIP finds a deviceInfo and device name from an IP address. -func deviceByIP(d *dockerutil.Docker, ip net.IP) (string, netdevs.DeviceInfo, error) { - out, err := d.Exec(dockerutil.RunOpts{}, "ip", "addr", "show") - if err != nil { - return "", netdevs.DeviceInfo{}, fmt.Errorf("listing devices on %s container: %w", d.Name, err) - } - devs, err := netdevs.ParseDevices(out) - if err != nil { - return "", netdevs.DeviceInfo{}, fmt.Errorf("parsing devices from %s container: %w", d.Name, err) - } - testDevice, deviceInfo, err := netdevs.FindDeviceByIP(ip, devs) - if err != nil { - return "", netdevs.DeviceInfo{}, fmt.Errorf("can't find deviceInfo for container %s: %w", d.Name, err) - } - return testDevice, deviceInfo, nil -} diff --git a/test/packetimpact/testbench/BUILD b/test/packetimpact/testbench/BUILD deleted file mode 100644 index d19ec07d4..000000000 --- a/test/packetimpact/testbench/BUILD +++ /dev/null @@ -1,46 +0,0 @@ -load("//tools:defs.bzl", "go_library", "go_test") - -package( - default_visibility = ["//test/packetimpact:__subpackages__"], - licenses = ["notice"], -) - -go_library( - name = "testbench", - srcs = [ - "connections.go", - "dut.go", - "dut_client.go", - "layers.go", - "rawsockets.go", - "testbench.go", - ], - deps = [ - "//pkg/tcpip", - "//pkg/tcpip/buffer", - "//pkg/tcpip/header", - "//pkg/tcpip/seqnum", - "//pkg/usermem", - "//test/packetimpact/netdevs", - "//test/packetimpact/proto:posix_server_go_proto", - "@com_github_google_go-cmp//cmp:go_default_library", - "@com_github_google_go-cmp//cmp/cmpopts:go_default_library", - "@com_github_mohae_deepcopy//:go_default_library", - "@org_golang_google_grpc//:go_default_library", - "@org_golang_google_grpc//keepalive:go_default_library", - "@org_golang_x_sys//unix:go_default_library", - "@org_uber_go_multierr//:go_default_library", - ], -) - -go_test( - name = "testbench_test", - size = "small", - srcs = ["layers_test.go"], - library = ":testbench", - deps = [ - "//pkg/tcpip", - "//pkg/tcpip/header", - "@com_github_mohae_deepcopy//:go_default_library", - ], -) diff --git a/test/packetimpact/testbench/connections.go b/test/packetimpact/testbench/connections.go deleted file mode 100644 index 8b4a4d905..000000000 --- a/test/packetimpact/testbench/connections.go +++ /dev/null @@ -1,950 +0,0 @@ -// Copyright 2020 The gVisor Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// http://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -// Package testbench has utilities to send and receive packets and also command -// the DUT to run POSIX functions. -package testbench - -import ( - "fmt" - "math/rand" - "net" - "testing" - "time" - - "github.com/mohae/deepcopy" - "go.uber.org/multierr" - "golang.org/x/sys/unix" - "gvisor.dev/gvisor/pkg/tcpip" - "gvisor.dev/gvisor/pkg/tcpip/header" - "gvisor.dev/gvisor/pkg/tcpip/seqnum" -) - -func portFromSockaddr(sa unix.Sockaddr) (uint16, error) { - switch sa := sa.(type) { - case *unix.SockaddrInet4: - return uint16(sa.Port), nil - case *unix.SockaddrInet6: - return uint16(sa.Port), nil - } - return 0, fmt.Errorf("sockaddr type %T does not contain port", sa) -} - -// pickPort makes a new socket and returns the socket FD and port. The domain should be AF_INET or AF_INET6. The caller must close the FD when done with -// the port if there is no error. -func pickPort(domain, typ int) (int, uint16, error) { - fd, err := unix.Socket(domain, typ, 0) - if err != nil { - return -1, 0, err - } - defer func() { - if err != nil { - err = multierr.Append(err, unix.Close(fd)) - } - }() - var sa unix.Sockaddr - switch domain { - case unix.AF_INET: - var sa4 unix.SockaddrInet4 - copy(sa4.Addr[:], net.ParseIP(LocalIPv4).To4()) - sa = &sa4 - case unix.AF_INET6: - var sa6 unix.SockaddrInet6 - copy(sa6.Addr[:], net.ParseIP(LocalIPv6).To16()) - sa = &sa6 - default: - return -1, 0, fmt.Errorf("invalid domain %d, it should be one of unix.AF_INET or unix.AF_INET6", domain) - } - if err = unix.Bind(fd, sa); err != nil { - return -1, 0, err - } - sa, err = unix.Getsockname(fd) - if err != nil { - return -1, 0, err - } - port, err := portFromSockaddr(sa) - if err != nil { - return -1, 0, err - } - return fd, port, nil -} - -// layerState stores the state of a layer of a connection. -type layerState interface { - // outgoing returns an outgoing layer to be sent in a frame. It should not - // update layerState, that is done in layerState.sent. - outgoing() Layer - - // incoming creates an expected Layer for comparing against a received Layer. - // Because the expectation can depend on values in the received Layer, it is - // an input to incoming. For example, the ACK number needs to be checked in a - // TCP packet but only if the ACK flag is set in the received packet. It - // should not update layerState, that is done in layerState.received. The - // caller takes ownership of the returned Layer. - incoming(received Layer) Layer - - // sent updates the layerState based on the Layer that was sent. The input is - // a Layer with all prev and next pointers populated so that the entire frame - // as it was sent is available. - sent(sent Layer) error - - // received updates the layerState based on a Layer that is receieved. The - // input is a Layer with all prev and next pointers populated so that the - // entire frame as it was receieved is available. - received(received Layer) error - - // close frees associated resources held by the LayerState. - close() error -} - -// etherState maintains state about an Ethernet connection. -type etherState struct { - out, in Ether -} - -var _ layerState = (*etherState)(nil) - -// newEtherState creates a new etherState. -func newEtherState(out, in Ether) (*etherState, error) { - lMAC, err := tcpip.ParseMACAddress(LocalMAC) - if err != nil { - return nil, fmt.Errorf("parsing local MAC: %q: %w", LocalMAC, err) - } - - rMAC, err := tcpip.ParseMACAddress(RemoteMAC) - if err != nil { - return nil, fmt.Errorf("parsing remote MAC: %q: %w", RemoteMAC, err) - } - s := etherState{ - out: Ether{SrcAddr: &lMAC, DstAddr: &rMAC}, - in: Ether{SrcAddr: &rMAC, DstAddr: &lMAC}, - } - if err := s.out.merge(&out); err != nil { - return nil, err - } - if err := s.in.merge(&in); err != nil { - return nil, err - } - return &s, nil -} - -func (s *etherState) outgoing() Layer { - return deepcopy.Copy(&s.out).(Layer) -} - -// incoming implements layerState.incoming. -func (s *etherState) incoming(Layer) Layer { - return deepcopy.Copy(&s.in).(Layer) -} - -func (*etherState) sent(Layer) error { - return nil -} - -func (*etherState) received(Layer) error { - return nil -} - -func (*etherState) close() error { - return nil -} - -// ipv4State maintains state about an IPv4 connection. -type ipv4State struct { - out, in IPv4 -} - -var _ layerState = (*ipv4State)(nil) - -// newIPv4State creates a new ipv4State. -func newIPv4State(out, in IPv4) (*ipv4State, error) { - lIP := tcpip.Address(net.ParseIP(LocalIPv4).To4()) - rIP := tcpip.Address(net.ParseIP(RemoteIPv4).To4()) - s := ipv4State{ - out: IPv4{SrcAddr: &lIP, DstAddr: &rIP}, - in: IPv4{SrcAddr: &rIP, DstAddr: &lIP}, - } - if err := s.out.merge(&out); err != nil { - return nil, err - } - if err := s.in.merge(&in); err != nil { - return nil, err - } - return &s, nil -} - -func (s *ipv4State) outgoing() Layer { - return deepcopy.Copy(&s.out).(Layer) -} - -// incoming implements layerState.incoming. -func (s *ipv4State) incoming(Layer) Layer { - return deepcopy.Copy(&s.in).(Layer) -} - -func (*ipv4State) sent(Layer) error { - return nil -} - -func (*ipv4State) received(Layer) error { - return nil -} - -func (*ipv4State) close() error { - return nil -} - -// ipv6State maintains state about an IPv6 connection. -type ipv6State struct { - out, in IPv6 -} - -var _ layerState = (*ipv6State)(nil) - -// newIPv6State creates a new ipv6State. -func newIPv6State(out, in IPv6) (*ipv6State, error) { - lIP := tcpip.Address(net.ParseIP(LocalIPv6).To16()) - rIP := tcpip.Address(net.ParseIP(RemoteIPv6).To16()) - s := ipv6State{ - out: IPv6{SrcAddr: &lIP, DstAddr: &rIP}, - in: IPv6{SrcAddr: &rIP, DstAddr: &lIP}, - } - if err := s.out.merge(&out); err != nil { - return nil, err - } - if err := s.in.merge(&in); err != nil { - return nil, err - } - return &s, nil -} - -// outgoing returns an outgoing layer to be sent in a frame. -func (s *ipv6State) outgoing() Layer { - return deepcopy.Copy(&s.out).(Layer) -} - -func (s *ipv6State) incoming(Layer) Layer { - return deepcopy.Copy(&s.in).(Layer) -} - -func (s *ipv6State) sent(Layer) error { - // Nothing to do. - return nil -} - -func (s *ipv6State) received(Layer) error { - // Nothing to do. - return nil -} - -// close cleans up any resources held. -func (s *ipv6State) close() error { - return nil -} - -// tcpState maintains state about a TCP connection. -type tcpState struct { - out, in TCP - localSeqNum, remoteSeqNum *seqnum.Value - synAck *TCP - portPickerFD int - finSent bool -} - -var _ layerState = (*tcpState)(nil) - -// SeqNumValue is a helper routine that allocates a new seqnum.Value value to -// store v and returns a pointer to it. -func SeqNumValue(v seqnum.Value) *seqnum.Value { - return &v -} - -// newTCPState creates a new TCPState. -func newTCPState(domain int, out, in TCP) (*tcpState, error) { - portPickerFD, localPort, err := pickPort(domain, unix.SOCK_STREAM) - if err != nil { - return nil, err - } - s := tcpState{ - out: TCP{SrcPort: &localPort}, - in: TCP{DstPort: &localPort}, - localSeqNum: SeqNumValue(seqnum.Value(rand.Uint32())), - portPickerFD: portPickerFD, - finSent: false, - } - if err := s.out.merge(&out); err != nil { - return nil, err - } - if err := s.in.merge(&in); err != nil { - return nil, err - } - return &s, nil -} - -func (s *tcpState) outgoing() Layer { - newOutgoing := deepcopy.Copy(s.out).(TCP) - if s.localSeqNum != nil { - newOutgoing.SeqNum = Uint32(uint32(*s.localSeqNum)) - } - if s.remoteSeqNum != nil { - newOutgoing.AckNum = Uint32(uint32(*s.remoteSeqNum)) - } - return &newOutgoing -} - -// incoming implements layerState.incoming. -func (s *tcpState) incoming(received Layer) Layer { - tcpReceived, ok := received.(*TCP) - if !ok { - return nil - } - newIn := deepcopy.Copy(s.in).(TCP) - if s.remoteSeqNum != nil { - newIn.SeqNum = Uint32(uint32(*s.remoteSeqNum)) - } - if s.localSeqNum != nil && (*tcpReceived.Flags&header.TCPFlagAck) != 0 { - // The caller didn't specify an AckNum so we'll expect the calculated one, - // but only if the ACK flag is set because the AckNum is not valid in a - // header if ACK is not set. - newIn.AckNum = Uint32(uint32(*s.localSeqNum)) - } - return &newIn -} - -func (s *tcpState) sent(sent Layer) error { - tcp, ok := sent.(*TCP) - if !ok { - return fmt.Errorf("can't update tcpState with %T Layer", sent) - } - if !s.finSent { - // update localSeqNum by the payload only when FIN is not yet sent by us - for current := tcp.next(); current != nil; current = current.next() { - s.localSeqNum.UpdateForward(seqnum.Size(current.length())) - } - } - if tcp.Flags != nil && *tcp.Flags&(header.TCPFlagSyn|header.TCPFlagFin) != 0 { - s.localSeqNum.UpdateForward(1) - } - if *tcp.Flags&(header.TCPFlagFin) != 0 { - s.finSent = true - } - return nil -} - -func (s *tcpState) received(l Layer) error { - tcp, ok := l.(*TCP) - if !ok { - return fmt.Errorf("can't update tcpState with %T Layer", l) - } - s.remoteSeqNum = SeqNumValue(seqnum.Value(*tcp.SeqNum)) - if *tcp.Flags&(header.TCPFlagSyn|header.TCPFlagFin) != 0 { - s.remoteSeqNum.UpdateForward(1) - } - for current := tcp.next(); current != nil; current = current.next() { - s.remoteSeqNum.UpdateForward(seqnum.Size(current.length())) - } - return nil -} - -// close frees the port associated with this connection. -func (s *tcpState) close() error { - if err := unix.Close(s.portPickerFD); err != nil { - return err - } - s.portPickerFD = -1 - return nil -} - -// udpState maintains state about a UDP connection. -type udpState struct { - out, in UDP - portPickerFD int -} - -var _ layerState = (*udpState)(nil) - -// newUDPState creates a new udpState. -func newUDPState(domain int, out, in UDP) (*udpState, error) { - portPickerFD, localPort, err := pickPort(domain, unix.SOCK_DGRAM) - if err != nil { - return nil, err - } - s := udpState{ - out: UDP{SrcPort: &localPort}, - in: UDP{DstPort: &localPort}, - portPickerFD: portPickerFD, - } - if err := s.out.merge(&out); err != nil { - return nil, err - } - if err := s.in.merge(&in); err != nil { - return nil, err - } - return &s, nil -} - -func (s *udpState) outgoing() Layer { - return deepcopy.Copy(&s.out).(Layer) -} - -// incoming implements layerState.incoming. -func (s *udpState) incoming(Layer) Layer { - return deepcopy.Copy(&s.in).(Layer) -} - -func (*udpState) sent(l Layer) error { - return nil -} - -func (*udpState) received(l Layer) error { - return nil -} - -// close frees the port associated with this connection. -func (s *udpState) close() error { - if err := unix.Close(s.portPickerFD); err != nil { - return err - } - s.portPickerFD = -1 - return nil -} - -// Connection holds a collection of layer states for maintaining a connection -// along with sockets for sniffer and injecting packets. -type Connection struct { - layerStates []layerState - injector Injector - sniffer Sniffer - t *testing.T -} - -// Returns the default incoming frame against which to match. If received is -// longer than layerStates then that may still count as a match. The reverse is -// never a match and nil is returned. -func (conn *Connection) incoming(received Layers) Layers { - if len(received) < len(conn.layerStates) { - return nil - } - in := Layers{} - for i, s := range conn.layerStates { - toMatch := s.incoming(received[i]) - if toMatch == nil { - return nil - } - in = append(in, toMatch) - } - return in -} - -func (conn *Connection) match(override, received Layers) bool { - toMatch := conn.incoming(received) - if toMatch == nil { - return false // Not enough layers in gotLayers for matching. - } - if err := toMatch.merge(override); err != nil { - return false // Failing to merge is not matching. - } - return toMatch.match(received) -} - -// Close frees associated resources held by the Connection. -func (conn *Connection) Close() { - errs := multierr.Combine(conn.sniffer.close(), conn.injector.close()) - for _, s := range conn.layerStates { - if err := s.close(); err != nil { - errs = multierr.Append(errs, fmt.Errorf("unable to close %+v: %s", s, err)) - } - } - if errs != nil { - conn.t.Fatalf("unable to close %+v: %s", conn, errs) - } -} - -// CreateFrame builds a frame for the connection with defaults overriden -// from the innermost layer out, and additionalLayers added after it. -// -// Note that overrideLayers can have a length that is less than the number -// of layers in this connection, and in such cases the innermost layers are -// overriden first. As an example, valid values of overrideLayers for a TCP- -// over-IPv4-over-Ethernet connection are: nil, [TCP], [IPv4, TCP], and -// [Ethernet, IPv4, TCP]. -func (conn *Connection) CreateFrame(overrideLayers Layers, additionalLayers ...Layer) Layers { - var layersToSend Layers - for i, s := range conn.layerStates { - layer := s.outgoing() - // overrideLayers and conn.layerStates have their tails aligned, so - // to find the index we move backwards by the distance i is to the - // end. - if j := len(overrideLayers) - (len(conn.layerStates) - i); j >= 0 { - if err := layer.merge(overrideLayers[j]); err != nil { - conn.t.Fatalf("can't merge %+v into %+v: %s", layer, overrideLayers[j], err) - } - } - layersToSend = append(layersToSend, layer) - } - layersToSend = append(layersToSend, additionalLayers...) - return layersToSend -} - -// SendFrameStateless sends a frame without updating any of the layer states. -// -// This method is useful for sending out-of-band control messages such as -// ICMP packets, where it would not make sense to update the transport layer's -// state using the ICMP header. -func (conn *Connection) SendFrameStateless(frame Layers) { - outBytes, err := frame.ToBytes() - if err != nil { - conn.t.Fatalf("can't build outgoing packet: %s", err) - } - conn.injector.Send(outBytes) -} - -// SendFrame sends a frame on the wire and updates the state of all layers. -func (conn *Connection) SendFrame(frame Layers) { - outBytes, err := frame.ToBytes() - if err != nil { - conn.t.Fatalf("can't build outgoing packet: %s", err) - } - conn.injector.Send(outBytes) - - // frame might have nil values where the caller wanted to use default values. - // sentFrame will have no nil values in it because it comes from parsing the - // bytes that were actually sent. - sentFrame := parse(parseEther, outBytes) - // Update the state of each layer based on what was sent. - for i, s := range conn.layerStates { - if err := s.sent(sentFrame[i]); err != nil { - conn.t.Fatalf("Unable to update the state of %+v with %s: %s", s, sentFrame[i], err) - } - } -} - -// send sends a packet, possibly with layers of this connection overridden and -// additional layers added. -// -// Types defined with Connection as the underlying type should expose -// type-safe versions of this method. -func (conn *Connection) send(overrideLayers Layers, additionalLayers ...Layer) { - conn.SendFrame(conn.CreateFrame(overrideLayers, additionalLayers...)) -} - -// recvFrame gets the next successfully parsed frame (of type Layers) within the -// timeout provided. If no parsable frame arrives before the timeout, it returns -// nil. -func (conn *Connection) recvFrame(timeout time.Duration) Layers { - if timeout <= 0 { - return nil - } - b := conn.sniffer.Recv(timeout) - if b == nil { - return nil - } - return parse(parseEther, b) -} - -// layersError stores the Layers that we got and the Layers that we wanted to -// match. -type layersError struct { - got, want Layers -} - -func (e *layersError) Error() string { - return e.got.diff(e.want) -} - -// Expect expects a frame with the final layerStates layer matching the -// provided Layer within the timeout specified. If it doesn't arrive in time, -// an error is returned. -func (conn *Connection) Expect(layer Layer, timeout time.Duration) (Layer, error) { - // Make a frame that will ignore all but the final layer. - layers := make([]Layer, len(conn.layerStates)) - layers[len(layers)-1] = layer - - gotFrame, err := conn.ExpectFrame(layers, timeout) - if err != nil { - return nil, err - } - if len(conn.layerStates)-1 < len(gotFrame) { - return gotFrame[len(conn.layerStates)-1], nil - } - conn.t.Fatal("the received frame should be at least as long as the expected layers") - panic("unreachable") -} - -// ExpectFrame expects a frame that matches the provided Layers within the -// timeout specified. If one arrives in time, the Layers is returned without an -// error. If it doesn't arrive in time, it returns nil and error is non-nil. -func (conn *Connection) ExpectFrame(layers Layers, timeout time.Duration) (Layers, error) { - deadline := time.Now().Add(timeout) - var errs error - for { - var gotLayers Layers - if timeout = time.Until(deadline); timeout > 0 { - gotLayers = conn.recvFrame(timeout) - } - if gotLayers == nil { - if errs == nil { - return nil, fmt.Errorf("got no frames matching %v during %s", layers, timeout) - } - return nil, fmt.Errorf("got no frames matching %v during %s: got %w", layers, timeout, errs) - } - if conn.match(layers, gotLayers) { - for i, s := range conn.layerStates { - if err := s.received(gotLayers[i]); err != nil { - conn.t.Fatal(err) - } - } - return gotLayers, nil - } - errs = multierr.Combine(errs, &layersError{got: gotLayers, want: conn.incoming(gotLayers)}) - } -} - -// Drain drains the sniffer's receive buffer by receiving packets until there's -// nothing else to receive. -func (conn *Connection) Drain() { - conn.sniffer.Drain() -} - -// TCPIPv4 maintains the state for all the layers in a TCP/IPv4 connection. -type TCPIPv4 Connection - -// NewTCPIPv4 creates a new TCPIPv4 connection with reasonable defaults. -func NewTCPIPv4(t *testing.T, outgoingTCP, incomingTCP TCP) TCPIPv4 { - etherState, err := newEtherState(Ether{}, Ether{}) - if err != nil { - t.Fatalf("can't make etherState: %s", err) - } - ipv4State, err := newIPv4State(IPv4{}, IPv4{}) - if err != nil { - t.Fatalf("can't make ipv4State: %s", err) - } - tcpState, err := newTCPState(unix.AF_INET, outgoingTCP, incomingTCP) - if err != nil { - t.Fatalf("can't make tcpState: %s", err) - } - injector, err := NewInjector(t) - if err != nil { - t.Fatalf("can't make injector: %s", err) - } - sniffer, err := NewSniffer(t) - if err != nil { - t.Fatalf("can't make sniffer: %s", err) - } - - return TCPIPv4{ - layerStates: []layerState{etherState, ipv4State, tcpState}, - injector: injector, - sniffer: sniffer, - t: t, - } -} - -// Connect performs a TCP 3-way handshake. The input Connection should have a -// final TCP Layer. -func (conn *TCPIPv4) Connect() { - conn.t.Helper() - - // Send the SYN. - conn.Send(TCP{Flags: Uint8(header.TCPFlagSyn)}) - - // Wait for the SYN-ACK. - synAck, err := conn.Expect(TCP{Flags: Uint8(header.TCPFlagSyn | header.TCPFlagAck)}, time.Second) - if err != nil { - conn.t.Fatalf("didn't get synack during handshake: %s", err) - } - conn.layerStates[len(conn.layerStates)-1].(*tcpState).synAck = synAck - - // Send an ACK. - conn.Send(TCP{Flags: Uint8(header.TCPFlagAck)}) -} - -// ConnectWithOptions performs a TCP 3-way handshake with given TCP options. -// The input Connection should have a final TCP Layer. -func (conn *TCPIPv4) ConnectWithOptions(options []byte) { - conn.t.Helper() - - // Send the SYN. - conn.Send(TCP{Flags: Uint8(header.TCPFlagSyn), Options: options}) - - // Wait for the SYN-ACK. - synAck, err := conn.Expect(TCP{Flags: Uint8(header.TCPFlagSyn | header.TCPFlagAck)}, time.Second) - if err != nil { - conn.t.Fatalf("didn't get synack during handshake: %s", err) - } - conn.layerStates[len(conn.layerStates)-1].(*tcpState).synAck = synAck - - // Send an ACK. - conn.Send(TCP{Flags: Uint8(header.TCPFlagAck)}) -} - -// ExpectData is a convenient method that expects a Layer and the Layer after -// it. If it doens't arrive in time, it returns nil. -func (conn *TCPIPv4) ExpectData(tcp *TCP, payload *Payload, timeout time.Duration) (Layers, error) { - expected := make([]Layer, len(conn.layerStates)) - expected[len(expected)-1] = tcp - if payload != nil { - expected = append(expected, payload) - } - return (*Connection)(conn).ExpectFrame(expected, timeout) -} - -// ExpectNextData attempts to receive the next incoming segment for the -// connection and expects that to match the given layers. -// -// It differs from ExpectData() in that here we are only interested in the next -// received segment, while ExpectData() can receive multiple segments for the -// connection until there is a match with given layers or a timeout. -func (conn *TCPIPv4) ExpectNextData(tcp *TCP, payload *Payload, timeout time.Duration) (Layers, error) { - // Receive the first incoming TCP segment for this connection. - got, err := conn.ExpectData(&TCP{}, nil, timeout) - if err != nil { - return nil, err - } - - expected := make([]Layer, len(conn.layerStates)) - expected[len(expected)-1] = tcp - if payload != nil { - expected = append(expected, payload) - tcp.SeqNum = Uint32(uint32(*conn.RemoteSeqNum()) - uint32(payload.Length())) - } - if !(*Connection)(conn).match(expected, got) { - return nil, fmt.Errorf("next frame is not matching %s during %s: got %s", expected, timeout, got) - } - return got, nil -} - -// Send a packet with reasonable defaults. Potentially override the TCP layer in -// the connection with the provided layer and add additionLayers. -func (conn *TCPIPv4) Send(tcp TCP, additionalLayers ...Layer) { - (*Connection)(conn).send(Layers{&tcp}, additionalLayers...) -} - -// Close frees associated resources held by the TCPIPv4 connection. -func (conn *TCPIPv4) Close() { - (*Connection)(conn).Close() -} - -// Expect expects a frame with the TCP layer matching the provided TCP within -// the timeout specified. If it doesn't arrive in time, an error is returned. -func (conn *TCPIPv4) Expect(tcp TCP, timeout time.Duration) (*TCP, error) { - layer, err := (*Connection)(conn).Expect(&tcp, timeout) - if layer == nil { - return nil, err - } - gotTCP, ok := layer.(*TCP) - if !ok { - conn.t.Fatalf("expected %s to be TCP", layer) - } - return gotTCP, err -} - -func (conn *TCPIPv4) tcpState() *tcpState { - state, ok := conn.layerStates[2].(*tcpState) - if !ok { - conn.t.Fatalf("got transport-layer state type=%T, expected tcpState", conn.layerStates[2]) - } - return state -} - -func (conn *TCPIPv4) ipv4State() *ipv4State { - state, ok := conn.layerStates[1].(*ipv4State) - if !ok { - conn.t.Fatalf("expected network-layer state type=%T, expected ipv4State", conn.layerStates[1]) - } - return state -} - -// RemoteSeqNum returns the next expected sequence number from the DUT. -func (conn *TCPIPv4) RemoteSeqNum() *seqnum.Value { - return conn.tcpState().remoteSeqNum -} - -// LocalSeqNum returns the next sequence number to send from the testbench. -func (conn *TCPIPv4) LocalSeqNum() *seqnum.Value { - return conn.tcpState().localSeqNum -} - -// SynAck returns the SynAck that was part of the handshake. -func (conn *TCPIPv4) SynAck() *TCP { - return conn.tcpState().synAck -} - -// LocalAddr gets the local socket address of this connection. -func (conn *TCPIPv4) LocalAddr() *unix.SockaddrInet4 { - sa := &unix.SockaddrInet4{Port: int(*conn.tcpState().out.SrcPort)} - copy(sa.Addr[:], *conn.ipv4State().out.SrcAddr) - return sa -} - -// Drain drains the sniffer's receive buffer by receiving packets until there's -// nothing else to receive. -func (conn *TCPIPv4) Drain() { - conn.sniffer.Drain() -} - -// IPv6Conn maintains the state for all the layers in a IPv6 connection. -type IPv6Conn Connection - -// NewIPv6Conn creates a new IPv6Conn connection with reasonable defaults. -func NewIPv6Conn(t *testing.T, outgoingIPv6, incomingIPv6 IPv6) IPv6Conn { - etherState, err := newEtherState(Ether{}, Ether{}) - if err != nil { - t.Fatalf("can't make EtherState: %s", err) - } - ipv6State, err := newIPv6State(outgoingIPv6, incomingIPv6) - if err != nil { - t.Fatalf("can't make IPv6State: %s", err) - } - - injector, err := NewInjector(t) - if err != nil { - t.Fatalf("can't make injector: %s", err) - } - sniffer, err := NewSniffer(t) - if err != nil { - t.Fatalf("can't make sniffer: %s", err) - } - - return IPv6Conn{ - layerStates: []layerState{etherState, ipv6State}, - injector: injector, - sniffer: sniffer, - t: t, - } -} - -// Send sends a frame with ipv6 overriding the IPv6 layer defaults and -// additionalLayers added after it. -func (conn *IPv6Conn) Send(ipv6 IPv6, additionalLayers ...Layer) { - (*Connection)(conn).send(Layers{&ipv6}, additionalLayers...) -} - -// Close to clean up any resources held. -func (conn *IPv6Conn) Close() { - (*Connection)(conn).Close() -} - -// ExpectFrame expects a frame that matches the provided Layers within the -// timeout specified. If it doesn't arrive in time, an error is returned. -func (conn *IPv6Conn) ExpectFrame(frame Layers, timeout time.Duration) (Layers, error) { - return (*Connection)(conn).ExpectFrame(frame, timeout) -} - -// UDPIPv4 maintains the state for all the layers in a UDP/IPv4 connection. -type UDPIPv4 Connection - -// NewUDPIPv4 creates a new UDPIPv4 connection with reasonable defaults. -func NewUDPIPv4(t *testing.T, outgoingUDP, incomingUDP UDP) UDPIPv4 { - etherState, err := newEtherState(Ether{}, Ether{}) - if err != nil { - t.Fatalf("can't make etherState: %s", err) - } - ipv4State, err := newIPv4State(IPv4{}, IPv4{}) - if err != nil { - t.Fatalf("can't make ipv4State: %s", err) - } - udpState, err := newUDPState(unix.AF_INET, outgoingUDP, incomingUDP) - if err != nil { - t.Fatalf("can't make udpState: %s", err) - } - injector, err := NewInjector(t) - if err != nil { - t.Fatalf("can't make injector: %s", err) - } - sniffer, err := NewSniffer(t) - if err != nil { - t.Fatalf("can't make sniffer: %s", err) - } - - return UDPIPv4{ - layerStates: []layerState{etherState, ipv4State, udpState}, - injector: injector, - sniffer: sniffer, - t: t, - } -} - -func (conn *UDPIPv4) udpState() *udpState { - state, ok := conn.layerStates[2].(*udpState) - if !ok { - conn.t.Fatalf("got transport-layer state type=%T, expected udpState", conn.layerStates[2]) - } - return state -} - -func (conn *UDPIPv4) ipv4State() *ipv4State { - state, ok := conn.layerStates[1].(*ipv4State) - if !ok { - conn.t.Fatalf("got network-layer state type=%T, expected ipv4State", conn.layerStates[1]) - } - return state -} - -// LocalAddr gets the local socket address of this connection. -func (conn *UDPIPv4) LocalAddr() *unix.SockaddrInet4 { - sa := &unix.SockaddrInet4{Port: int(*conn.udpState().out.SrcPort)} - copy(sa.Addr[:], *conn.ipv4State().out.SrcAddr) - return sa -} - -// Send sends a packet with reasonable defaults, potentially overriding the UDP -// layer and adding additionLayers. -func (conn *UDPIPv4) Send(udp UDP, additionalLayers ...Layer) { - (*Connection)(conn).send(Layers{&udp}, additionalLayers...) -} - -// SendIP sends a packet with reasonable defaults, potentially overriding the -// UDP and IPv4 headers and adding additionLayers. -func (conn *UDPIPv4) SendIP(ip IPv4, udp UDP, additionalLayers ...Layer) { - (*Connection)(conn).send(Layers{&ip, &udp}, additionalLayers...) -} - -// Expect expects a frame with the UDP layer matching the provided UDP within -// the timeout specified. If it doesn't arrive in time, an error is returned. -func (conn *UDPIPv4) Expect(udp UDP, timeout time.Duration) (*UDP, error) { - conn.t.Helper() - layer, err := (*Connection)(conn).Expect(&udp, timeout) - if layer == nil { - return nil, err - } - gotUDP, ok := layer.(*UDP) - if !ok { - conn.t.Fatalf("expected %s to be UDP", layer) - } - return gotUDP, err -} - -// ExpectData is a convenient method that expects a Layer and the Layer after -// it. If it doens't arrive in time, it returns nil. -func (conn *UDPIPv4) ExpectData(udp UDP, payload Payload, timeout time.Duration) (Layers, error) { - conn.t.Helper() - expected := make([]Layer, len(conn.layerStates)) - expected[len(expected)-1] = &udp - if payload.length() != 0 { - expected = append(expected, &payload) - } - return (*Connection)(conn).ExpectFrame(expected, timeout) -} - -// Close frees associated resources held by the UDPIPv4 connection. -func (conn *UDPIPv4) Close() { - (*Connection)(conn).Close() -} - -// Drain drains the sniffer's receive buffer by receiving packets until there's -// nothing else to receive. -func (conn *UDPIPv4) Drain() { - conn.sniffer.Drain() -} diff --git a/test/packetimpact/testbench/dut.go b/test/packetimpact/testbench/dut.go deleted file mode 100644 index 2a2afecb5..000000000 --- a/test/packetimpact/testbench/dut.go +++ /dev/null @@ -1,658 +0,0 @@ -// Copyright 2020 The gVisor Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// http://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -package testbench - -import ( - "context" - "flag" - "net" - "strconv" - "syscall" - "testing" - - pb "gvisor.dev/gvisor/test/packetimpact/proto/posix_server_go_proto" - - "golang.org/x/sys/unix" - "google.golang.org/grpc" - "google.golang.org/grpc/keepalive" -) - -// DUT communicates with the DUT to force it to make POSIX calls. -type DUT struct { - t *testing.T - conn *grpc.ClientConn - posixServer POSIXClient -} - -// NewDUT creates a new connection with the DUT over gRPC. -func NewDUT(t *testing.T) DUT { - flag.Parse() - if err := genPseudoFlags(); err != nil { - t.Fatal("generating psuedo flags:", err) - } - - posixServerAddress := POSIXServerIP + ":" + strconv.Itoa(POSIXServerPort) - conn, err := grpc.Dial(posixServerAddress, grpc.WithInsecure(), grpc.WithKeepaliveParams(keepalive.ClientParameters{Timeout: RPCKeepalive})) - if err != nil { - t.Fatalf("failed to grpc.Dial(%s): %s", posixServerAddress, err) - } - posixServer := NewPOSIXClient(conn) - return DUT{ - t: t, - conn: conn, - posixServer: posixServer, - } -} - -// TearDown closes the underlying connection. -func (dut *DUT) TearDown() { - dut.conn.Close() -} - -func (dut *DUT) sockaddrToProto(sa unix.Sockaddr) *pb.Sockaddr { - dut.t.Helper() - switch s := sa.(type) { - case *unix.SockaddrInet4: - return &pb.Sockaddr{ - Sockaddr: &pb.Sockaddr_In{ - In: &pb.SockaddrIn{ - Family: unix.AF_INET, - Port: uint32(s.Port), - Addr: s.Addr[:], - }, - }, - } - case *unix.SockaddrInet6: - return &pb.Sockaddr{ - Sockaddr: &pb.Sockaddr_In6{ - In6: &pb.SockaddrIn6{ - Family: unix.AF_INET6, - Port: uint32(s.Port), - Flowinfo: 0, - ScopeId: s.ZoneId, - Addr: s.Addr[:], - }, - }, - } - } - dut.t.Fatalf("can't parse Sockaddr: %+v", sa) - return nil -} - -func (dut *DUT) protoToSockaddr(sa *pb.Sockaddr) unix.Sockaddr { - dut.t.Helper() - switch s := sa.Sockaddr.(type) { - case *pb.Sockaddr_In: - ret := unix.SockaddrInet4{ - Port: int(s.In.GetPort()), - } - copy(ret.Addr[:], s.In.GetAddr()) - return &ret - case *pb.Sockaddr_In6: - ret := unix.SockaddrInet6{ - Port: int(s.In6.GetPort()), - ZoneId: s.In6.GetScopeId(), - } - copy(ret.Addr[:], s.In6.GetAddr()) - } - dut.t.Fatalf("can't parse Sockaddr: %+v", sa) - return nil -} - -// CreateBoundSocket makes a new socket on the DUT, with type typ and protocol -// proto, and bound to the IP address addr. Returns the new file descriptor and -// the port that was selected on the DUT. -func (dut *DUT) CreateBoundSocket(typ, proto int32, addr net.IP) (int32, uint16) { - dut.t.Helper() - var fd int32 - if addr.To4() != nil { - fd = dut.Socket(unix.AF_INET, typ, proto) - sa := unix.SockaddrInet4{} - copy(sa.Addr[:], addr.To4()) - dut.Bind(fd, &sa) - } else if addr.To16() != nil { - fd = dut.Socket(unix.AF_INET6, typ, proto) - sa := unix.SockaddrInet6{} - copy(sa.Addr[:], addr.To16()) - dut.Bind(fd, &sa) - } else { - dut.t.Fatalf("unknown ip addr type for remoteIP") - } - sa := dut.GetSockName(fd) - var port int - switch s := sa.(type) { - case *unix.SockaddrInet4: - port = s.Port - case *unix.SockaddrInet6: - port = s.Port - default: - dut.t.Fatalf("unknown sockaddr type from getsockname: %t", sa) - } - return fd, uint16(port) -} - -// CreateListener makes a new TCP connection. If it fails, the test ends. -func (dut *DUT) CreateListener(typ, proto, backlog int32) (int32, uint16) { - fd, remotePort := dut.CreateBoundSocket(typ, proto, net.ParseIP(RemoteIPv4)) - dut.Listen(fd, backlog) - return fd, remotePort -} - -// All the functions that make gRPC calls to the POSIX service are below, sorted -// alphabetically. - -// Accept calls accept on the DUT and causes a fatal test failure if it doesn't -// succeed. If more control over the timeout or error handling is needed, use -// AcceptWithErrno. -func (dut *DUT) Accept(sockfd int32) (int32, unix.Sockaddr) { - dut.t.Helper() - ctx, cancel := context.WithTimeout(context.Background(), RPCTimeout) - defer cancel() - fd, sa, err := dut.AcceptWithErrno(ctx, sockfd) - if fd < 0 { - dut.t.Fatalf("failed to accept: %s", err) - } - return fd, sa -} - -// AcceptWithErrno calls accept on the DUT. -func (dut *DUT) AcceptWithErrno(ctx context.Context, sockfd int32) (int32, unix.Sockaddr, error) { - dut.t.Helper() - req := pb.AcceptRequest{ - Sockfd: sockfd, - } - resp, err := dut.posixServer.Accept(ctx, &req) - if err != nil { - dut.t.Fatalf("failed to call Accept: %s", err) - } - return resp.GetFd(), dut.protoToSockaddr(resp.GetAddr()), syscall.Errno(resp.GetErrno_()) -} - -// Bind calls bind on the DUT and causes a fatal test failure if it doesn't -// succeed. If more control over the timeout or error handling is -// needed, use BindWithErrno. -func (dut *DUT) Bind(fd int32, sa unix.Sockaddr) { - dut.t.Helper() - ctx, cancel := context.WithTimeout(context.Background(), RPCTimeout) - defer cancel() - ret, err := dut.BindWithErrno(ctx, fd, sa) - if ret != 0 { - dut.t.Fatalf("failed to bind socket: %s", err) - } -} - -// BindWithErrno calls bind on the DUT. -func (dut *DUT) BindWithErrno(ctx context.Context, fd int32, sa unix.Sockaddr) (int32, error) { - dut.t.Helper() - req := pb.BindRequest{ - Sockfd: fd, - Addr: dut.sockaddrToProto(sa), - } - resp, err := dut.posixServer.Bind(ctx, &req) - if err != nil { - dut.t.Fatalf("failed to call Bind: %s", err) - } - return resp.GetRet(), syscall.Errno(resp.GetErrno_()) -} - -// Close calls close on the DUT and causes a fatal test failure if it doesn't -// succeed. If more control over the timeout or error handling is needed, use -// CloseWithErrno. -func (dut *DUT) Close(fd int32) { - dut.t.Helper() - ctx, cancel := context.WithTimeout(context.Background(), RPCTimeout) - defer cancel() - ret, err := dut.CloseWithErrno(ctx, fd) - if ret != 0 { - dut.t.Fatalf("failed to close: %s", err) - } -} - -// CloseWithErrno calls close on the DUT. -func (dut *DUT) CloseWithErrno(ctx context.Context, fd int32) (int32, error) { - dut.t.Helper() - req := pb.CloseRequest{ - Fd: fd, - } - resp, err := dut.posixServer.Close(ctx, &req) - if err != nil { - dut.t.Fatalf("failed to call Close: %s", err) - } - return resp.GetRet(), syscall.Errno(resp.GetErrno_()) -} - -// Connect calls connect on the DUT and causes a fatal test failure if it -// doesn't succeed. If more control over the timeout or error handling is -// needed, use ConnectWithErrno. -func (dut *DUT) Connect(fd int32, sa unix.Sockaddr) { - dut.t.Helper() - ctx, cancel := context.WithTimeout(context.Background(), RPCTimeout) - defer cancel() - ret, err := dut.ConnectWithErrno(ctx, fd, sa) - // Ignore 'operation in progress' error that can be returned when the socket - // is non-blocking. - if err != syscall.Errno(unix.EINPROGRESS) && ret != 0 { - dut.t.Fatalf("failed to connect socket: %s", err) - } -} - -// ConnectWithErrno calls bind on the DUT. -func (dut *DUT) ConnectWithErrno(ctx context.Context, fd int32, sa unix.Sockaddr) (int32, error) { - dut.t.Helper() - req := pb.ConnectRequest{ - Sockfd: fd, - Addr: dut.sockaddrToProto(sa), - } - resp, err := dut.posixServer.Connect(ctx, &req) - if err != nil { - dut.t.Fatalf("failed to call Connect: %s", err) - } - return resp.GetRet(), syscall.Errno(resp.GetErrno_()) -} - -// Fcntl calls fcntl on the DUT and causes a fatal test failure if it -// doesn't succeed. If more control over the timeout or error handling is -// needed, use FcntlWithErrno. -func (dut *DUT) Fcntl(fd, cmd, arg int32) int32 { - dut.t.Helper() - ctx, cancel := context.WithTimeout(context.Background(), RPCTimeout) - defer cancel() - ret, err := dut.FcntlWithErrno(ctx, fd, cmd, arg) - if ret == -1 { - dut.t.Fatalf("failed to Fcntl: ret=%d, errno=%s", ret, err) - } - return ret -} - -// FcntlWithErrno calls fcntl on the DUT. -func (dut *DUT) FcntlWithErrno(ctx context.Context, fd, cmd, arg int32) (int32, error) { - dut.t.Helper() - req := pb.FcntlRequest{ - Fd: fd, - Cmd: cmd, - Arg: arg, - } - resp, err := dut.posixServer.Fcntl(ctx, &req) - if err != nil { - dut.t.Fatalf("failed to call Fcntl: %s", err) - } - return resp.GetRet(), syscall.Errno(resp.GetErrno_()) -} - -// GetSockName calls getsockname on the DUT and causes a fatal test failure if -// it doesn't succeed. If more control over the timeout or error handling is -// needed, use GetSockNameWithErrno. -func (dut *DUT) GetSockName(sockfd int32) unix.Sockaddr { - dut.t.Helper() - ctx, cancel := context.WithTimeout(context.Background(), RPCTimeout) - defer cancel() - ret, sa, err := dut.GetSockNameWithErrno(ctx, sockfd) - if ret != 0 { - dut.t.Fatalf("failed to getsockname: %s", err) - } - return sa -} - -// GetSockNameWithErrno calls getsockname on the DUT. -func (dut *DUT) GetSockNameWithErrno(ctx context.Context, sockfd int32) (int32, unix.Sockaddr, error) { - dut.t.Helper() - req := pb.GetSockNameRequest{ - Sockfd: sockfd, - } - resp, err := dut.posixServer.GetSockName(ctx, &req) - if err != nil { - dut.t.Fatalf("failed to call Bind: %s", err) - } - return resp.GetRet(), dut.protoToSockaddr(resp.GetAddr()), syscall.Errno(resp.GetErrno_()) -} - -func (dut *DUT) getSockOpt(ctx context.Context, sockfd, level, optname, optlen int32, typ pb.GetSockOptRequest_SockOptType) (int32, *pb.SockOptVal, error) { - dut.t.Helper() - req := pb.GetSockOptRequest{ - Sockfd: sockfd, - Level: level, - Optname: optname, - Optlen: optlen, - Type: typ, - } - resp, err := dut.posixServer.GetSockOpt(ctx, &req) - if err != nil { - dut.t.Fatalf("failed to call GetSockOpt: %s", err) - } - optval := resp.GetOptval() - if optval == nil { - dut.t.Fatalf("GetSockOpt response does not contain a value") - } - return resp.GetRet(), optval, syscall.Errno(resp.GetErrno_()) -} - -// GetSockOpt calls getsockopt on the DUT and causes a fatal test failure if it -// doesn't succeed. If more control over the timeout or error handling is -// needed, use GetSockOptWithErrno. Because endianess and the width of values -// might differ between the testbench and DUT architectures, prefer to use a -// more specific GetSockOptXxx function. -func (dut *DUT) GetSockOpt(sockfd, level, optname, optlen int32) []byte { - dut.t.Helper() - ctx, cancel := context.WithTimeout(context.Background(), RPCTimeout) - defer cancel() - ret, optval, err := dut.GetSockOptWithErrno(ctx, sockfd, level, optname, optlen) - if ret != 0 { - dut.t.Fatalf("failed to GetSockOpt: %s", err) - } - return optval -} - -// GetSockOptWithErrno calls getsockopt on the DUT. Because endianess and the -// width of values might differ between the testbench and DUT architectures, -// prefer to use a more specific GetSockOptXxxWithErrno function. -func (dut *DUT) GetSockOptWithErrno(ctx context.Context, sockfd, level, optname, optlen int32) (int32, []byte, error) { - dut.t.Helper() - ret, optval, errno := dut.getSockOpt(ctx, sockfd, level, optname, optlen, pb.GetSockOptRequest_BYTES) - bytesval, ok := optval.Val.(*pb.SockOptVal_Bytesval) - if !ok { - dut.t.Fatalf("GetSockOpt got value type: %T, want bytes", optval) - } - return ret, bytesval.Bytesval, errno -} - -// GetSockOptInt calls getsockopt on the DUT and causes a fatal test failure -// if it doesn't succeed. If more control over the int optval or error handling -// is needed, use GetSockOptIntWithErrno. -func (dut *DUT) GetSockOptInt(sockfd, level, optname int32) int32 { - dut.t.Helper() - ctx, cancel := context.WithTimeout(context.Background(), RPCTimeout) - defer cancel() - ret, intval, err := dut.GetSockOptIntWithErrno(ctx, sockfd, level, optname) - if ret != 0 { - dut.t.Fatalf("failed to GetSockOptInt: %s", err) - } - return intval -} - -// GetSockOptIntWithErrno calls getsockopt with an integer optval. -func (dut *DUT) GetSockOptIntWithErrno(ctx context.Context, sockfd, level, optname int32) (int32, int32, error) { - dut.t.Helper() - ret, optval, errno := dut.getSockOpt(ctx, sockfd, level, optname, 0, pb.GetSockOptRequest_INT) - intval, ok := optval.Val.(*pb.SockOptVal_Intval) - if !ok { - dut.t.Fatalf("GetSockOpt got value type: %T, want int", optval) - } - return ret, intval.Intval, errno -} - -// GetSockOptTimeval calls getsockopt on the DUT and causes a fatal test failure -// if it doesn't succeed. If more control over the timeout or error handling is -// needed, use GetSockOptTimevalWithErrno. -func (dut *DUT) GetSockOptTimeval(sockfd, level, optname int32) unix.Timeval { - dut.t.Helper() - ctx, cancel := context.WithTimeout(context.Background(), RPCTimeout) - defer cancel() - ret, timeval, err := dut.GetSockOptTimevalWithErrno(ctx, sockfd, level, optname) - if ret != 0 { - dut.t.Fatalf("failed to GetSockOptTimeval: %s", err) - } - return timeval -} - -// GetSockOptTimevalWithErrno calls getsockopt and returns a timeval. -func (dut *DUT) GetSockOptTimevalWithErrno(ctx context.Context, sockfd, level, optname int32) (int32, unix.Timeval, error) { - dut.t.Helper() - ret, optval, errno := dut.getSockOpt(ctx, sockfd, level, optname, 0, pb.GetSockOptRequest_TIME) - tv, ok := optval.Val.(*pb.SockOptVal_Timeval) - if !ok { - dut.t.Fatalf("GetSockOpt got value type: %T, want timeval", optval) - } - timeval := unix.Timeval{ - Sec: tv.Timeval.Seconds, - Usec: tv.Timeval.Microseconds, - } - return ret, timeval, errno -} - -// Listen calls listen on the DUT and causes a fatal test failure if it doesn't -// succeed. If more control over the timeout or error handling is needed, use -// ListenWithErrno. -func (dut *DUT) Listen(sockfd, backlog int32) { - dut.t.Helper() - ctx, cancel := context.WithTimeout(context.Background(), RPCTimeout) - defer cancel() - ret, err := dut.ListenWithErrno(ctx, sockfd, backlog) - if ret != 0 { - dut.t.Fatalf("failed to listen: %s", err) - } -} - -// ListenWithErrno calls listen on the DUT. -func (dut *DUT) ListenWithErrno(ctx context.Context, sockfd, backlog int32) (int32, error) { - dut.t.Helper() - req := pb.ListenRequest{ - Sockfd: sockfd, - Backlog: backlog, - } - resp, err := dut.posixServer.Listen(ctx, &req) - if err != nil { - dut.t.Fatalf("failed to call Listen: %s", err) - } - return resp.GetRet(), syscall.Errno(resp.GetErrno_()) -} - -// Send calls send on the DUT and causes a fatal test failure if it doesn't -// succeed. If more control over the timeout or error handling is needed, use -// SendWithErrno. -func (dut *DUT) Send(sockfd int32, buf []byte, flags int32) int32 { - dut.t.Helper() - ctx, cancel := context.WithTimeout(context.Background(), RPCTimeout) - defer cancel() - ret, err := dut.SendWithErrno(ctx, sockfd, buf, flags) - if ret == -1 { - dut.t.Fatalf("failed to send: %s", err) - } - return ret -} - -// SendWithErrno calls send on the DUT. -func (dut *DUT) SendWithErrno(ctx context.Context, sockfd int32, buf []byte, flags int32) (int32, error) { - dut.t.Helper() - req := pb.SendRequest{ - Sockfd: sockfd, - Buf: buf, - Flags: flags, - } - resp, err := dut.posixServer.Send(ctx, &req) - if err != nil { - dut.t.Fatalf("failed to call Send: %s", err) - } - return resp.GetRet(), syscall.Errno(resp.GetErrno_()) -} - -// SendTo calls sendto on the DUT and causes a fatal test failure if it doesn't -// succeed. If more control over the timeout or error handling is needed, use -// SendToWithErrno. -func (dut *DUT) SendTo(sockfd int32, buf []byte, flags int32, destAddr unix.Sockaddr) int32 { - dut.t.Helper() - ctx, cancel := context.WithTimeout(context.Background(), RPCTimeout) - defer cancel() - ret, err := dut.SendToWithErrno(ctx, sockfd, buf, flags, destAddr) - if ret == -1 { - dut.t.Fatalf("failed to sendto: %s", err) - } - return ret -} - -// SendToWithErrno calls sendto on the DUT. -func (dut *DUT) SendToWithErrno(ctx context.Context, sockfd int32, buf []byte, flags int32, destAddr unix.Sockaddr) (int32, error) { - dut.t.Helper() - req := pb.SendToRequest{ - Sockfd: sockfd, - Buf: buf, - Flags: flags, - DestAddr: dut.sockaddrToProto(destAddr), - } - resp, err := dut.posixServer.SendTo(ctx, &req) - if err != nil { - dut.t.Fatalf("faled to call SendTo: %s", err) - } - return resp.GetRet(), syscall.Errno(resp.GetErrno_()) -} - -// SetNonBlocking will set O_NONBLOCK flag for fd if nonblocking -// is true, otherwise it will clear the flag. -func (dut *DUT) SetNonBlocking(fd int32, nonblocking bool) { - dut.t.Helper() - flags := dut.Fcntl(fd, unix.F_GETFL, 0) - if nonblocking { - flags |= unix.O_NONBLOCK - } else { - flags &= ^unix.O_NONBLOCK - } - dut.Fcntl(fd, unix.F_SETFL, flags) -} - -func (dut *DUT) setSockOpt(ctx context.Context, sockfd, level, optname int32, optval *pb.SockOptVal) (int32, error) { - dut.t.Helper() - req := pb.SetSockOptRequest{ - Sockfd: sockfd, - Level: level, - Optname: optname, - Optval: optval, - } - resp, err := dut.posixServer.SetSockOpt(ctx, &req) - if err != nil { - dut.t.Fatalf("failed to call SetSockOpt: %s", err) - } - return resp.GetRet(), syscall.Errno(resp.GetErrno_()) -} - -// SetSockOpt calls setsockopt on the DUT and causes a fatal test failure if it -// doesn't succeed. If more control over the timeout or error handling is -// needed, use SetSockOptWithErrno. Because endianess and the width of values -// might differ between the testbench and DUT architectures, prefer to use a -// more specific SetSockOptXxx function. -func (dut *DUT) SetSockOpt(sockfd, level, optname int32, optval []byte) { - dut.t.Helper() - ctx, cancel := context.WithTimeout(context.Background(), RPCTimeout) - defer cancel() - ret, err := dut.SetSockOptWithErrno(ctx, sockfd, level, optname, optval) - if ret != 0 { - dut.t.Fatalf("failed to SetSockOpt: %s", err) - } -} - -// SetSockOptWithErrno calls setsockopt on the DUT. Because endianess and the -// width of values might differ between the testbench and DUT architectures, -// prefer to use a more specific SetSockOptXxxWithErrno function. -func (dut *DUT) SetSockOptWithErrno(ctx context.Context, sockfd, level, optname int32, optval []byte) (int32, error) { - dut.t.Helper() - return dut.setSockOpt(ctx, sockfd, level, optname, &pb.SockOptVal{Val: &pb.SockOptVal_Bytesval{optval}}) -} - -// SetSockOptInt calls setsockopt on the DUT and causes a fatal test failure -// if it doesn't succeed. If more control over the int optval or error handling -// is needed, use SetSockOptIntWithErrno. -func (dut *DUT) SetSockOptInt(sockfd, level, optname, optval int32) { - dut.t.Helper() - ctx, cancel := context.WithTimeout(context.Background(), RPCTimeout) - defer cancel() - ret, err := dut.SetSockOptIntWithErrno(ctx, sockfd, level, optname, optval) - if ret != 0 { - dut.t.Fatalf("failed to SetSockOptInt: %s", err) - } -} - -// SetSockOptIntWithErrno calls setsockopt with an integer optval. -func (dut *DUT) SetSockOptIntWithErrno(ctx context.Context, sockfd, level, optname, optval int32) (int32, error) { - dut.t.Helper() - return dut.setSockOpt(ctx, sockfd, level, optname, &pb.SockOptVal{Val: &pb.SockOptVal_Intval{optval}}) -} - -// SetSockOptTimeval calls setsockopt on the DUT and causes a fatal test failure -// if it doesn't succeed. If more control over the timeout or error handling is -// needed, use SetSockOptTimevalWithErrno. -func (dut *DUT) SetSockOptTimeval(sockfd, level, optname int32, tv *unix.Timeval) { - dut.t.Helper() - ctx, cancel := context.WithTimeout(context.Background(), RPCTimeout) - defer cancel() - ret, err := dut.SetSockOptTimevalWithErrno(ctx, sockfd, level, optname, tv) - if ret != 0 { - dut.t.Fatalf("failed to SetSockOptTimeval: %s", err) - } -} - -// SetSockOptTimevalWithErrno calls setsockopt with the timeval converted to -// bytes. -func (dut *DUT) SetSockOptTimevalWithErrno(ctx context.Context, sockfd, level, optname int32, tv *unix.Timeval) (int32, error) { - dut.t.Helper() - timeval := pb.Timeval{ - Seconds: int64(tv.Sec), - Microseconds: int64(tv.Usec), - } - return dut.setSockOpt(ctx, sockfd, level, optname, &pb.SockOptVal{Val: &pb.SockOptVal_Timeval{&timeval}}) -} - -// Socket calls socket on the DUT and returns the file descriptor. If socket -// fails on the DUT, the test ends. -func (dut *DUT) Socket(domain, typ, proto int32) int32 { - dut.t.Helper() - fd, err := dut.SocketWithErrno(domain, typ, proto) - if fd < 0 { - dut.t.Fatalf("failed to create socket: %s", err) - } - return fd -} - -// SocketWithErrno calls socket on the DUT and returns the fd and errno. -func (dut *DUT) SocketWithErrno(domain, typ, proto int32) (int32, error) { - dut.t.Helper() - req := pb.SocketRequest{ - Domain: domain, - Type: typ, - Protocol: proto, - } - ctx := context.Background() - resp, err := dut.posixServer.Socket(ctx, &req) - if err != nil { - dut.t.Fatalf("failed to call Socket: %s", err) - } - return resp.GetFd(), syscall.Errno(resp.GetErrno_()) -} - -// Recv calls recv on the DUT and causes a fatal test failure if it doesn't -// succeed. If more control over the timeout or error handling is needed, use -// RecvWithErrno. -func (dut *DUT) Recv(sockfd, len, flags int32) []byte { - dut.t.Helper() - ctx, cancel := context.WithTimeout(context.Background(), RPCTimeout) - defer cancel() - ret, buf, err := dut.RecvWithErrno(ctx, sockfd, len, flags) - if ret == -1 { - dut.t.Fatalf("failed to recv: %s", err) - } - return buf -} - -// RecvWithErrno calls recv on the DUT. -func (dut *DUT) RecvWithErrno(ctx context.Context, sockfd, len, flags int32) (int32, []byte, error) { - dut.t.Helper() - req := pb.RecvRequest{ - Sockfd: sockfd, - Len: len, - Flags: flags, - } - resp, err := dut.posixServer.Recv(ctx, &req) - if err != nil { - dut.t.Fatalf("failed to call Recv: %s", err) - } - return resp.GetRet(), resp.GetBuf(), syscall.Errno(resp.GetErrno_()) -} diff --git a/test/packetimpact/testbench/dut_client.go b/test/packetimpact/testbench/dut_client.go deleted file mode 100644 index d0e68c5da..000000000 --- a/test/packetimpact/testbench/dut_client.go +++ /dev/null @@ -1,28 +0,0 @@ -// Copyright 2020 The gVisor Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// http://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -package testbench - -import ( - "google.golang.org/grpc" - pb "gvisor.dev/gvisor/test/packetimpact/proto/posix_server_go_proto" -) - -// PosixClient is a gRPC client for the Posix service. -type POSIXClient pb.PosixClient - -// NewPOSIXClient makes a new gRPC client for the POSIX service. -func NewPOSIXClient(c grpc.ClientConnInterface) POSIXClient { - return pb.NewPosixClient(c) -} diff --git a/test/packetimpact/testbench/layers.go b/test/packetimpact/testbench/layers.go deleted file mode 100644 index a8121b0da..000000000 --- a/test/packetimpact/testbench/layers.go +++ /dev/null @@ -1,1384 +0,0 @@ -// Copyright 2020 The gVisor Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// http://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -package testbench - -import ( - "encoding/hex" - "fmt" - "reflect" - "strings" - - "github.com/google/go-cmp/cmp" - "github.com/google/go-cmp/cmp/cmpopts" - "go.uber.org/multierr" - "gvisor.dev/gvisor/pkg/tcpip" - "gvisor.dev/gvisor/pkg/tcpip/buffer" - "gvisor.dev/gvisor/pkg/tcpip/header" -) - -// Layer is the interface that all encapsulations must implement. -// -// A Layer is an encapsulation in a packet, such as TCP, IPv4, IPv6, etc. A -// Layer contains all the fields of the encapsulation. Each field is a pointer -// and may be nil. -type Layer interface { - fmt.Stringer - - // ToBytes converts the Layer into bytes. In places where the Layer's field - // isn't nil, the value that is pointed to is used. When the field is nil, a - // reasonable default for the Layer is used. For example, "64" for IPv4 TTL - // and a calculated checksum for TCP or IP. Some layers require information - // from the previous or next layers in order to compute a default, such as - // TCP's checksum or Ethernet's type, so each Layer has a doubly-linked list - // to the layer's neighbors. - ToBytes() ([]byte, error) - - // match checks if the current Layer matches the provided Layer. If either - // Layer has a nil in a given field, that field is considered matching. - // Otherwise, the values pointed to by the fields must match. The LayerBase is - // ignored. - match(Layer) bool - - // length in bytes of the current encapsulation - length() int - - // next gets a pointer to the encapsulated Layer. - next() Layer - - // prev gets a pointer to the Layer encapsulating this one. - Prev() Layer - - // setNext sets the pointer to the encapsulated Layer. - setNext(Layer) - - // setPrev sets the pointer to the Layer encapsulating this one. - setPrev(Layer) - - // merge overrides the values in the interface with the provided values. - merge(Layer) error -} - -// LayerBase is the common elements of all layers. -type LayerBase struct { - nextLayer Layer - prevLayer Layer -} - -func (lb *LayerBase) next() Layer { - return lb.nextLayer -} - -// Prev returns the previous layer. -func (lb *LayerBase) Prev() Layer { - return lb.prevLayer -} - -func (lb *LayerBase) setNext(l Layer) { - lb.nextLayer = l -} - -func (lb *LayerBase) setPrev(l Layer) { - lb.prevLayer = l -} - -// equalLayer compares that two Layer structs match while ignoring field in -// which either input has a nil and also ignoring the LayerBase of the inputs. -func equalLayer(x, y Layer) bool { - if x == nil || y == nil { - return true - } - // opt ignores comparison pairs where either of the inputs is a nil. - opt := cmp.FilterValues(func(x, y interface{}) bool { - for _, l := range []interface{}{x, y} { - v := reflect.ValueOf(l) - if (v.Kind() == reflect.Ptr || v.Kind() == reflect.Slice) && v.IsNil() { - return true - } - } - return false - }, cmp.Ignore()) - return cmp.Equal(x, y, opt, cmpopts.IgnoreTypes(LayerBase{})) -} - -// mergeLayer merges y into x. Any fields for which y has a non-nil value, that -// value overwrite the corresponding fields in x. -func mergeLayer(x, y Layer) error { - if y == nil { - return nil - } - if reflect.TypeOf(x) != reflect.TypeOf(y) { - return fmt.Errorf("can't merge %T into %T", y, x) - } - vx := reflect.ValueOf(x).Elem() - vy := reflect.ValueOf(y).Elem() - t := vy.Type() - for i := 0; i < vy.NumField(); i++ { - t := t.Field(i) - if t.Anonymous { - // Ignore the LayerBase in the Layer struct. - continue - } - v := vy.Field(i) - if v.IsNil() { - continue - } - vx.Field(i).Set(v) - } - return nil -} - -func stringLayer(l Layer) string { - v := reflect.ValueOf(l).Elem() - t := v.Type() - var ret []string - for i := 0; i < v.NumField(); i++ { - t := t.Field(i) - if t.Anonymous { - // Ignore the LayerBase in the Layer struct. - continue - } - v := v.Field(i) - if v.IsNil() { - continue - } - v = reflect.Indirect(v) - if v.Kind() == reflect.Slice && v.Type().Elem().Kind() == reflect.Uint8 { - ret = append(ret, fmt.Sprintf("%s:\n%v", t.Name, hex.Dump(v.Bytes()))) - } else { - ret = append(ret, fmt.Sprintf("%s:%v", t.Name, v)) - } - } - return fmt.Sprintf("&%s{%s}", t, strings.Join(ret, " ")) -} - -// Ether can construct and match an ethernet encapsulation. -type Ether struct { - LayerBase - SrcAddr *tcpip.LinkAddress - DstAddr *tcpip.LinkAddress - Type *tcpip.NetworkProtocolNumber -} - -func (l *Ether) String() string { - return stringLayer(l) -} - -// ToBytes implements Layer.ToBytes. -func (l *Ether) ToBytes() ([]byte, error) { - b := make([]byte, header.EthernetMinimumSize) - h := header.Ethernet(b) - fields := &header.EthernetFields{} - if l.SrcAddr != nil { - fields.SrcAddr = *l.SrcAddr - } - if l.DstAddr != nil { - fields.DstAddr = *l.DstAddr - } - if l.Type != nil { - fields.Type = *l.Type - } else { - switch n := l.next().(type) { - case *IPv4: - fields.Type = header.IPv4ProtocolNumber - case *IPv6: - fields.Type = header.IPv6ProtocolNumber - default: - return nil, fmt.Errorf("ethernet header's next layer is unrecognized: %#v", n) - } - } - h.Encode(fields) - return h, nil -} - -// LinkAddress is a helper routine that allocates a new tcpip.LinkAddress value -// to store v and returns a pointer to it. -func LinkAddress(v tcpip.LinkAddress) *tcpip.LinkAddress { - return &v -} - -// NetworkProtocolNumber is a helper routine that allocates a new -// tcpip.NetworkProtocolNumber value to store v and returns a pointer to it. -func NetworkProtocolNumber(v tcpip.NetworkProtocolNumber) *tcpip.NetworkProtocolNumber { - return &v -} - -// layerParser parses the input bytes and returns a Layer along with the next -// layerParser to run. If there is no more parsing to do, the returned -// layerParser is nil. -type layerParser func([]byte) (Layer, layerParser) - -// parse parses bytes starting with the first layerParser and using successive -// layerParsers until all the bytes are parsed. -func parse(parser layerParser, b []byte) Layers { - var layers Layers - for { - var layer Layer - layer, parser = parser(b) - layers = append(layers, layer) - if parser == nil { - break - } - b = b[layer.length():] - } - layers.linkLayers() - return layers -} - -// parseEther parses the bytes assuming that they start with an ethernet header -// and continues parsing further encapsulations. -func parseEther(b []byte) (Layer, layerParser) { - h := header.Ethernet(b) - ether := Ether{ - SrcAddr: LinkAddress(h.SourceAddress()), - DstAddr: LinkAddress(h.DestinationAddress()), - Type: NetworkProtocolNumber(h.Type()), - } - var nextParser layerParser - switch h.Type() { - case header.IPv4ProtocolNumber: - nextParser = parseIPv4 - case header.IPv6ProtocolNumber: - nextParser = parseIPv6 - default: - // Assume that the rest is a payload. - nextParser = parsePayload - } - return ðer, nextParser -} - -func (l *Ether) match(other Layer) bool { - return equalLayer(l, other) -} - -func (l *Ether) length() int { - return header.EthernetMinimumSize -} - -// merge implements Layer.merge. -func (l *Ether) merge(other Layer) error { - return mergeLayer(l, other) -} - -// IPv4 can construct and match an IPv4 encapsulation. -type IPv4 struct { - LayerBase - IHL *uint8 - TOS *uint8 - TotalLength *uint16 - ID *uint16 - Flags *uint8 - FragmentOffset *uint16 - TTL *uint8 - Protocol *uint8 - Checksum *uint16 - SrcAddr *tcpip.Address - DstAddr *tcpip.Address -} - -func (l *IPv4) String() string { - return stringLayer(l) -} - -// ToBytes implements Layer.ToBytes. -func (l *IPv4) ToBytes() ([]byte, error) { - b := make([]byte, header.IPv4MinimumSize) - h := header.IPv4(b) - fields := &header.IPv4Fields{ - IHL: 20, - TOS: 0, - TotalLength: 0, - ID: 0, - Flags: 0, - FragmentOffset: 0, - TTL: 64, - Protocol: 0, - Checksum: 0, - SrcAddr: tcpip.Address(""), - DstAddr: tcpip.Address(""), - } - if l.TOS != nil { - fields.TOS = *l.TOS - } - if l.TotalLength != nil { - fields.TotalLength = *l.TotalLength - } else { - fields.TotalLength = uint16(l.length()) - current := l.next() - for current != nil { - fields.TotalLength += uint16(current.length()) - current = current.next() - } - } - if l.ID != nil { - fields.ID = *l.ID - } - if l.Flags != nil { - fields.Flags = *l.Flags - } - if l.FragmentOffset != nil { - fields.FragmentOffset = *l.FragmentOffset - } - if l.TTL != nil { - fields.TTL = *l.TTL - } - if l.Protocol != nil { - fields.Protocol = *l.Protocol - } else { - switch n := l.next().(type) { - case *TCP: - fields.Protocol = uint8(header.TCPProtocolNumber) - case *UDP: - fields.Protocol = uint8(header.UDPProtocolNumber) - case *ICMPv4: - fields.Protocol = uint8(header.ICMPv4ProtocolNumber) - default: - // TODO(b/150301488): Support more protocols as needed. - return nil, fmt.Errorf("ipv4 header's next layer is unrecognized: %#v", n) - } - } - if l.SrcAddr != nil { - fields.SrcAddr = *l.SrcAddr - } - if l.DstAddr != nil { - fields.DstAddr = *l.DstAddr - } - if l.Checksum != nil { - fields.Checksum = *l.Checksum - } - h.Encode(fields) - if l.Checksum == nil { - h.SetChecksum(^h.CalculateChecksum()) - } - return h, nil -} - -// Uint16 is a helper routine that allocates a new -// uint16 value to store v and returns a pointer to it. -func Uint16(v uint16) *uint16 { - return &v -} - -// Uint8 is a helper routine that allocates a new -// uint8 value to store v and returns a pointer to it. -func Uint8(v uint8) *uint8 { - return &v -} - -// Address is a helper routine that allocates a new tcpip.Address value to store -// v and returns a pointer to it. -func Address(v tcpip.Address) *tcpip.Address { - return &v -} - -// parseIPv4 parses the bytes assuming that they start with an ipv4 header and -// continues parsing further encapsulations. -func parseIPv4(b []byte) (Layer, layerParser) { - h := header.IPv4(b) - tos, _ := h.TOS() - ipv4 := IPv4{ - IHL: Uint8(h.HeaderLength()), - TOS: &tos, - TotalLength: Uint16(h.TotalLength()), - ID: Uint16(h.ID()), - Flags: Uint8(h.Flags()), - FragmentOffset: Uint16(h.FragmentOffset()), - TTL: Uint8(h.TTL()), - Protocol: Uint8(h.Protocol()), - Checksum: Uint16(h.Checksum()), - SrcAddr: Address(h.SourceAddress()), - DstAddr: Address(h.DestinationAddress()), - } - var nextParser layerParser - switch h.TransportProtocol() { - case header.TCPProtocolNumber: - nextParser = parseTCP - case header.UDPProtocolNumber: - nextParser = parseUDP - case header.ICMPv4ProtocolNumber: - nextParser = parseICMPv4 - default: - // Assume that the rest is a payload. - nextParser = parsePayload - } - return &ipv4, nextParser -} - -func (l *IPv4) match(other Layer) bool { - return equalLayer(l, other) -} - -func (l *IPv4) length() int { - if l.IHL == nil { - return header.IPv4MinimumSize - } - return int(*l.IHL) -} - -// merge implements Layer.merge. -func (l *IPv4) merge(other Layer) error { - return mergeLayer(l, other) -} - -// IPv6 can construct and match an IPv6 encapsulation. -type IPv6 struct { - LayerBase - TrafficClass *uint8 - FlowLabel *uint32 - PayloadLength *uint16 - NextHeader *uint8 - HopLimit *uint8 - SrcAddr *tcpip.Address - DstAddr *tcpip.Address -} - -func (l *IPv6) String() string { - return stringLayer(l) -} - -// ToBytes implements Layer.ToBytes. -func (l *IPv6) ToBytes() ([]byte, error) { - b := make([]byte, header.IPv6MinimumSize) - h := header.IPv6(b) - fields := &header.IPv6Fields{ - HopLimit: 64, - } - if l.TrafficClass != nil { - fields.TrafficClass = *l.TrafficClass - } - if l.FlowLabel != nil { - fields.FlowLabel = *l.FlowLabel - } - if l.PayloadLength != nil { - fields.PayloadLength = *l.PayloadLength - } else { - for current := l.next(); current != nil; current = current.next() { - fields.PayloadLength += uint16(current.length()) - } - } - if l.NextHeader != nil { - fields.NextHeader = *l.NextHeader - } else { - switch n := l.next().(type) { - case *TCP: - fields.NextHeader = uint8(header.TCPProtocolNumber) - case *UDP: - fields.NextHeader = uint8(header.UDPProtocolNumber) - case *ICMPv6: - fields.NextHeader = uint8(header.ICMPv6ProtocolNumber) - case *IPv6HopByHopOptionsExtHdr: - fields.NextHeader = uint8(header.IPv6HopByHopOptionsExtHdrIdentifier) - case *IPv6DestinationOptionsExtHdr: - fields.NextHeader = uint8(header.IPv6DestinationOptionsExtHdrIdentifier) - default: - // TODO(b/150301488): Support more protocols as needed. - return nil, fmt.Errorf("ToBytes can't deduce the IPv6 header's next protocol: %#v", n) - } - } - if l.HopLimit != nil { - fields.HopLimit = *l.HopLimit - } - if l.SrcAddr != nil { - fields.SrcAddr = *l.SrcAddr - } - if l.DstAddr != nil { - fields.DstAddr = *l.DstAddr - } - h.Encode(fields) - return h, nil -} - -// nextIPv6PayloadParser finds the corresponding parser for nextHeader. -func nextIPv6PayloadParser(nextHeader uint8) layerParser { - switch tcpip.TransportProtocolNumber(nextHeader) { - case header.TCPProtocolNumber: - return parseTCP - case header.UDPProtocolNumber: - return parseUDP - case header.ICMPv6ProtocolNumber: - return parseICMPv6 - } - switch header.IPv6ExtensionHeaderIdentifier(nextHeader) { - case header.IPv6HopByHopOptionsExtHdrIdentifier: - return parseIPv6HopByHopOptionsExtHdr - case header.IPv6DestinationOptionsExtHdrIdentifier: - return parseIPv6DestinationOptionsExtHdr - } - return parsePayload -} - -// parseIPv6 parses the bytes assuming that they start with an ipv6 header and -// continues parsing further encapsulations. -func parseIPv6(b []byte) (Layer, layerParser) { - h := header.IPv6(b) - tos, flowLabel := h.TOS() - ipv6 := IPv6{ - TrafficClass: &tos, - FlowLabel: &flowLabel, - PayloadLength: Uint16(h.PayloadLength()), - NextHeader: Uint8(h.NextHeader()), - HopLimit: Uint8(h.HopLimit()), - SrcAddr: Address(h.SourceAddress()), - DstAddr: Address(h.DestinationAddress()), - } - nextParser := nextIPv6PayloadParser(h.NextHeader()) - return &ipv6, nextParser -} - -func (l *IPv6) match(other Layer) bool { - return equalLayer(l, other) -} - -func (l *IPv6) length() int { - return header.IPv6MinimumSize -} - -// merge overrides the values in l with the values from other but only in fields -// where the value is not nil. -func (l *IPv6) merge(other Layer) error { - return mergeLayer(l, other) -} - -// IPv6HopByHopOptionsExtHdr can construct and match an IPv6HopByHopOptions -// Extension Header. -type IPv6HopByHopOptionsExtHdr struct { - LayerBase - NextHeader *header.IPv6ExtensionHeaderIdentifier - Options []byte -} - -// IPv6DestinationOptionsExtHdr can construct and match an IPv6DestinationOptions -// Extension Header. -type IPv6DestinationOptionsExtHdr struct { - LayerBase - NextHeader *header.IPv6ExtensionHeaderIdentifier - Options []byte -} - -// ipv6OptionsExtHdrToBytes serializes an options extension header into bytes. -func ipv6OptionsExtHdrToBytes(nextHeader *header.IPv6ExtensionHeaderIdentifier, options []byte) []byte { - length := len(options) + 2 - bytes := make([]byte, length) - if nextHeader == nil { - bytes[0] = byte(header.IPv6NoNextHeaderIdentifier) - } else { - bytes[0] = byte(*nextHeader) - } - // ExtHdrLen field is the length of the extension header - // in 8-octet unit, ignoring the first 8 octets. - // https://tools.ietf.org/html/rfc2460#section-4.3 - // https://tools.ietf.org/html/rfc2460#section-4.6 - bytes[1] = uint8((length - 8) / 8) - copy(bytes[2:], options) - return bytes -} - -// IPv6ExtHdrIdent is a helper routine that allocates a new -// header.IPv6ExtensionHeaderIdentifier value to store v and returns a pointer -// to it. -func IPv6ExtHdrIdent(id header.IPv6ExtensionHeaderIdentifier) *header.IPv6ExtensionHeaderIdentifier { - return &id -} - -// ToBytes implements Layer.ToBytes -func (l *IPv6HopByHopOptionsExtHdr) ToBytes() ([]byte, error) { - return ipv6OptionsExtHdrToBytes(l.NextHeader, l.Options), nil -} - -// ToBytes implements Layer.ToBytes -func (l *IPv6DestinationOptionsExtHdr) ToBytes() ([]byte, error) { - return ipv6OptionsExtHdrToBytes(l.NextHeader, l.Options), nil -} - -// parseIPv6ExtHdr parses an IPv6 extension header and returns the NextHeader -// field, the rest of the payload and a parser function for the corresponding -// next extension header. -func parseIPv6ExtHdr(b []byte) (header.IPv6ExtensionHeaderIdentifier, []byte, layerParser) { - nextHeader := b[0] - // For HopByHop and Destination options extension headers, - // This field is the length of the extension header in - // 8-octet units, not including the first 8 octets. - // https://tools.ietf.org/html/rfc2460#section-4.3 - // https://tools.ietf.org/html/rfc2460#section-4.6 - length := b[1]*8 + 8 - data := b[2:length] - nextParser := nextIPv6PayloadParser(nextHeader) - return header.IPv6ExtensionHeaderIdentifier(nextHeader), data, nextParser -} - -// parseIPv6HopByHopOptionsExtHdr parses the bytes assuming that they start -// with an IPv6 HopByHop Options Extension Header. -func parseIPv6HopByHopOptionsExtHdr(b []byte) (Layer, layerParser) { - nextHeader, options, nextParser := parseIPv6ExtHdr(b) - return &IPv6HopByHopOptionsExtHdr{NextHeader: &nextHeader, Options: options}, nextParser -} - -// parseIPv6DestinationOptionsExtHdr parses the bytes assuming that they start -// with an IPv6 Destination Options Extension Header. -func parseIPv6DestinationOptionsExtHdr(b []byte) (Layer, layerParser) { - nextHeader, options, nextParser := parseIPv6ExtHdr(b) - return &IPv6DestinationOptionsExtHdr{NextHeader: &nextHeader, Options: options}, nextParser -} - -func (l *IPv6HopByHopOptionsExtHdr) length() int { - return len(l.Options) + 2 -} - -func (l *IPv6HopByHopOptionsExtHdr) match(other Layer) bool { - return equalLayer(l, other) -} - -// merge overrides the values in l with the values from other but only in fields -// where the value is not nil. -func (l *IPv6HopByHopOptionsExtHdr) merge(other Layer) error { - return mergeLayer(l, other) -} - -func (l *IPv6HopByHopOptionsExtHdr) String() string { - return stringLayer(l) -} - -func (l *IPv6DestinationOptionsExtHdr) length() int { - return len(l.Options) + 2 -} - -func (l *IPv6DestinationOptionsExtHdr) match(other Layer) bool { - return equalLayer(l, other) -} - -// merge overrides the values in l with the values from other but only in fields -// where the value is not nil. -func (l *IPv6DestinationOptionsExtHdr) merge(other Layer) error { - return mergeLayer(l, other) -} - -func (l *IPv6DestinationOptionsExtHdr) String() string { - return stringLayer(l) -} - -// ICMPv6 can construct and match an ICMPv6 encapsulation. -type ICMPv6 struct { - LayerBase - Type *header.ICMPv6Type - Code *byte - Checksum *uint16 - NDPPayload []byte -} - -func (l *ICMPv6) String() string { - // TODO(eyalsoha): Do something smarter here when *l.Type is ParameterProblem? - // We could parse the contents of the Payload as if it were an IPv6 packet. - return stringLayer(l) -} - -// ToBytes implements Layer.ToBytes. -func (l *ICMPv6) ToBytes() ([]byte, error) { - b := make([]byte, header.ICMPv6HeaderSize+len(l.NDPPayload)) - h := header.ICMPv6(b) - if l.Type != nil { - h.SetType(*l.Type) - } - if l.Code != nil { - h.SetCode(*l.Code) - } - copy(h.NDPPayload(), l.NDPPayload) - if l.Checksum != nil { - h.SetChecksum(*l.Checksum) - } else { - // It is possible that the ICMPv6 header does not follow the IPv6 header - // immediately, there could be one or more extension headers in between. - // We need to search forward to find the IPv6 header. - for prev := l.Prev(); prev != nil; prev = prev.Prev() { - if ipv6, ok := prev.(*IPv6); ok { - h.SetChecksum(header.ICMPv6Checksum(h, *ipv6.SrcAddr, *ipv6.DstAddr, buffer.VectorisedView{})) - break - } - } - } - return h, nil -} - -// ICMPv6Type is a helper routine that allocates a new ICMPv6Type value to store -// v and returns a pointer to it. -func ICMPv6Type(v header.ICMPv6Type) *header.ICMPv6Type { - return &v -} - -// Byte is a helper routine that allocates a new byte value to store -// v and returns a pointer to it. -func Byte(v byte) *byte { - return &v -} - -// parseICMPv6 parses the bytes assuming that they start with an ICMPv6 header. -func parseICMPv6(b []byte) (Layer, layerParser) { - h := header.ICMPv6(b) - icmpv6 := ICMPv6{ - Type: ICMPv6Type(h.Type()), - Code: Byte(h.Code()), - Checksum: Uint16(h.Checksum()), - NDPPayload: h.NDPPayload(), - } - return &icmpv6, nil -} - -func (l *ICMPv6) match(other Layer) bool { - return equalLayer(l, other) -} - -func (l *ICMPv6) length() int { - return header.ICMPv6HeaderSize + len(l.NDPPayload) -} - -// merge overrides the values in l with the values from other but only in fields -// where the value is not nil. -func (l *ICMPv6) merge(other Layer) error { - return mergeLayer(l, other) -} - -// ICMPv4Type is a helper routine that allocates a new header.ICMPv4Type value -// to store t and returns a pointer to it. -func ICMPv4Type(t header.ICMPv4Type) *header.ICMPv4Type { - return &t -} - -// ICMPv4 can construct and match an ICMPv4 encapsulation. -type ICMPv4 struct { - LayerBase - Type *header.ICMPv4Type - Code *uint8 - Checksum *uint16 -} - -func (l *ICMPv4) String() string { - return stringLayer(l) -} - -// ToBytes implements Layer.ToBytes. -func (l *ICMPv4) ToBytes() ([]byte, error) { - b := make([]byte, header.ICMPv4MinimumSize) - h := header.ICMPv4(b) - if l.Type != nil { - h.SetType(*l.Type) - } - if l.Code != nil { - h.SetCode(byte(*l.Code)) - } - if l.Checksum != nil { - h.SetChecksum(*l.Checksum) - return h, nil - } - payload, err := payload(l) - if err != nil { - return nil, err - } - h.SetChecksum(header.ICMPv4Checksum(h, payload)) - return h, nil -} - -// parseICMPv4 parses the bytes as an ICMPv4 header, returning a Layer and a -// parser for the encapsulated payload. -func parseICMPv4(b []byte) (Layer, layerParser) { - h := header.ICMPv4(b) - icmpv4 := ICMPv4{ - Type: ICMPv4Type(h.Type()), - Code: Uint8(h.Code()), - Checksum: Uint16(h.Checksum()), - } - return &icmpv4, parsePayload -} - -func (l *ICMPv4) match(other Layer) bool { - return equalLayer(l, other) -} - -func (l *ICMPv4) length() int { - return header.ICMPv4MinimumSize -} - -// merge overrides the values in l with the values from other but only in fields -// where the value is not nil. -func (l *ICMPv4) merge(other Layer) error { - return mergeLayer(l, other) -} - -// TCP can construct and match a TCP encapsulation. -type TCP struct { - LayerBase - SrcPort *uint16 - DstPort *uint16 - SeqNum *uint32 - AckNum *uint32 - DataOffset *uint8 - Flags *uint8 - WindowSize *uint16 - Checksum *uint16 - UrgentPointer *uint16 - Options []byte -} - -func (l *TCP) String() string { - return stringLayer(l) -} - -// ToBytes implements Layer.ToBytes. -func (l *TCP) ToBytes() ([]byte, error) { - b := make([]byte, l.length()) - h := header.TCP(b) - if l.SrcPort != nil { - h.SetSourcePort(*l.SrcPort) - } - if l.DstPort != nil { - h.SetDestinationPort(*l.DstPort) - } - if l.SeqNum != nil { - h.SetSequenceNumber(*l.SeqNum) - } - if l.AckNum != nil { - h.SetAckNumber(*l.AckNum) - } - if l.DataOffset != nil { - h.SetDataOffset(*l.DataOffset) - } else { - h.SetDataOffset(uint8(l.length())) - } - if l.Flags != nil { - h.SetFlags(*l.Flags) - } - if l.WindowSize != nil { - h.SetWindowSize(*l.WindowSize) - } else { - h.SetWindowSize(32768) - } - if l.UrgentPointer != nil { - h.SetUrgentPoiner(*l.UrgentPointer) - } - copy(b[header.TCPMinimumSize:], l.Options) - header.AddTCPOptionPadding(b[header.TCPMinimumSize:], len(l.Options)) - if l.Checksum != nil { - h.SetChecksum(*l.Checksum) - return h, nil - } - if err := setTCPChecksum(&h, l); err != nil { - return nil, err - } - return h, nil -} - -// totalLength returns the length of the provided layer and all following -// layers. -func totalLength(l Layer) int { - var totalLength int - for ; l != nil; l = l.next() { - totalLength += l.length() - } - return totalLength -} - -// payload returns a buffer.VectorisedView of l's payload. -func payload(l Layer) (buffer.VectorisedView, error) { - var payloadBytes buffer.VectorisedView - for current := l.next(); current != nil; current = current.next() { - payload, err := current.ToBytes() - if err != nil { - return buffer.VectorisedView{}, fmt.Errorf("can't get bytes for next header: %s", payload) - } - payloadBytes.AppendView(payload) - } - return payloadBytes, nil -} - -// layerChecksum calculates the checksum of the Layer header, including the -// peusdeochecksum of the layer before it and all the bytes after it. -func layerChecksum(l Layer, protoNumber tcpip.TransportProtocolNumber) (uint16, error) { - totalLength := uint16(totalLength(l)) - var xsum uint16 - switch s := l.Prev().(type) { - case *IPv4: - xsum = header.PseudoHeaderChecksum(protoNumber, *s.SrcAddr, *s.DstAddr, totalLength) - default: - // TODO(b/150301488): Support more protocols, like IPv6. - return 0, fmt.Errorf("can't get src and dst addr from previous layer: %#v", s) - } - payloadBytes, err := payload(l) - if err != nil { - return 0, err - } - xsum = header.ChecksumVV(payloadBytes, xsum) - return xsum, nil -} - -// setTCPChecksum calculates the checksum of the TCP header and sets it in h. -func setTCPChecksum(h *header.TCP, tcp *TCP) error { - h.SetChecksum(0) - xsum, err := layerChecksum(tcp, header.TCPProtocolNumber) - if err != nil { - return err - } - h.SetChecksum(^h.CalculateChecksum(xsum)) - return nil -} - -// Uint32 is a helper routine that allocates a new -// uint32 value to store v and returns a pointer to it. -func Uint32(v uint32) *uint32 { - return &v -} - -// parseTCP parses the bytes assuming that they start with a tcp header and -// continues parsing further encapsulations. -func parseTCP(b []byte) (Layer, layerParser) { - h := header.TCP(b) - tcp := TCP{ - SrcPort: Uint16(h.SourcePort()), - DstPort: Uint16(h.DestinationPort()), - SeqNum: Uint32(h.SequenceNumber()), - AckNum: Uint32(h.AckNumber()), - DataOffset: Uint8(h.DataOffset()), - Flags: Uint8(h.Flags()), - WindowSize: Uint16(h.WindowSize()), - Checksum: Uint16(h.Checksum()), - UrgentPointer: Uint16(h.UrgentPointer()), - Options: b[header.TCPMinimumSize:h.DataOffset()], - } - return &tcp, parsePayload -} - -func (l *TCP) match(other Layer) bool { - return equalLayer(l, other) -} - -func (l *TCP) length() int { - if l.DataOffset == nil { - // TCP header including the options must end on a 32-bit - // boundary; the user could potentially give us a slice - // whose length is not a multiple of 4 bytes, so we have - // to do the alignment here. - optlen := (len(l.Options) + 3) & ^3 - return header.TCPMinimumSize + optlen - } - return int(*l.DataOffset) -} - -// merge implements Layer.merge. -func (l *TCP) merge(other Layer) error { - return mergeLayer(l, other) -} - -// UDP can construct and match a UDP encapsulation. -type UDP struct { - LayerBase - SrcPort *uint16 - DstPort *uint16 - Length *uint16 - Checksum *uint16 -} - -func (l *UDP) String() string { - return stringLayer(l) -} - -// ToBytes implements Layer.ToBytes. -func (l *UDP) ToBytes() ([]byte, error) { - b := make([]byte, header.UDPMinimumSize) - h := header.UDP(b) - if l.SrcPort != nil { - h.SetSourcePort(*l.SrcPort) - } - if l.DstPort != nil { - h.SetDestinationPort(*l.DstPort) - } - if l.Length != nil { - h.SetLength(*l.Length) - } else { - h.SetLength(uint16(totalLength(l))) - } - if l.Checksum != nil { - h.SetChecksum(*l.Checksum) - return h, nil - } - if err := setUDPChecksum(&h, l); err != nil { - return nil, err - } - return h, nil -} - -// setUDPChecksum calculates the checksum of the UDP header and sets it in h. -func setUDPChecksum(h *header.UDP, udp *UDP) error { - h.SetChecksum(0) - xsum, err := layerChecksum(udp, header.UDPProtocolNumber) - if err != nil { - return err - } - h.SetChecksum(^h.CalculateChecksum(xsum)) - return nil -} - -// parseUDP parses the bytes assuming that they start with a udp header and -// returns the parsed layer and the next parser to use. -func parseUDP(b []byte) (Layer, layerParser) { - h := header.UDP(b) - udp := UDP{ - SrcPort: Uint16(h.SourcePort()), - DstPort: Uint16(h.DestinationPort()), - Length: Uint16(h.Length()), - Checksum: Uint16(h.Checksum()), - } - return &udp, parsePayload -} - -func (l *UDP) match(other Layer) bool { - return equalLayer(l, other) -} - -func (l *UDP) length() int { - return header.UDPMinimumSize -} - -// merge implements Layer.merge. -func (l *UDP) merge(other Layer) error { - return mergeLayer(l, other) -} - -// Payload has bytes beyond OSI layer 4. -type Payload struct { - LayerBase - Bytes []byte -} - -func (l *Payload) String() string { - return stringLayer(l) -} - -// parsePayload parses the bytes assuming that they start with a payload and -// continue to the end. There can be no further encapsulations. -func parsePayload(b []byte) (Layer, layerParser) { - payload := Payload{ - Bytes: b, - } - return &payload, nil -} - -// ToBytes implements Layer.ToBytes. -func (l *Payload) ToBytes() ([]byte, error) { - return l.Bytes, nil -} - -// Length returns payload byte length. -func (l *Payload) Length() int { - return l.length() -} - -func (l *Payload) match(other Layer) bool { - return equalLayer(l, other) -} - -func (l *Payload) length() int { - return len(l.Bytes) -} - -// merge implements Layer.merge. -func (l *Payload) merge(other Layer) error { - return mergeLayer(l, other) -} - -// Layers is an array of Layer and supports similar functions to Layer. -type Layers []Layer - -// linkLayers sets the linked-list ponters in ls. -func (ls *Layers) linkLayers() { - for i, l := range *ls { - if i > 0 { - l.setPrev((*ls)[i-1]) - } else { - l.setPrev(nil) - } - if i+1 < len(*ls) { - l.setNext((*ls)[i+1]) - } else { - l.setNext(nil) - } - } -} - -// ToBytes converts the Layers into bytes. It creates a linked list of the Layer -// structs and then concatentates the output of ToBytes on each Layer. -func (ls *Layers) ToBytes() ([]byte, error) { - ls.linkLayers() - outBytes := []byte{} - for _, l := range *ls { - layerBytes, err := l.ToBytes() - if err != nil { - return nil, err - } - outBytes = append(outBytes, layerBytes...) - } - return outBytes, nil -} - -func (ls *Layers) match(other Layers) bool { - if len(*ls) > len(other) { - return false - } - for i, l := range *ls { - if !equalLayer(l, other[i]) { - return false - } - } - return true -} - -// layerDiff stores the diffs for each field along with the label for the Layer. -// If rows is nil, that means that there was no diff. -type layerDiff struct { - label string - rows []layerDiffRow -} - -// layerDiffRow stores the fields and corresponding values for two got and want -// layers. If the value was nil then the string stored is the empty string. -type layerDiffRow struct { - field, got, want string -} - -// diffLayer extracts all differing fields between two layers. -func diffLayer(got, want Layer) []layerDiffRow { - vGot := reflect.ValueOf(got).Elem() - vWant := reflect.ValueOf(want).Elem() - if vGot.Type() != vWant.Type() { - return nil - } - t := vGot.Type() - var result []layerDiffRow - for i := 0; i < t.NumField(); i++ { - t := t.Field(i) - if t.Anonymous { - // Ignore the LayerBase in the Layer struct. - continue - } - vGot := vGot.Field(i) - vWant := vWant.Field(i) - gotString := "" - if !vGot.IsNil() { - gotString = fmt.Sprint(reflect.Indirect(vGot)) - } - wantString := "" - if !vWant.IsNil() { - wantString = fmt.Sprint(reflect.Indirect(vWant)) - } - result = append(result, layerDiffRow{t.Name, gotString, wantString}) - } - return result -} - -// layerType returns a concise string describing the type of the Layer, like -// "TCP", or "IPv6". -func layerType(l Layer) string { - return reflect.TypeOf(l).Elem().Name() -} - -// diff compares Layers and returns a representation of the difference. Each -// Layer in the Layers is pairwise compared. If an element in either is nil, it -// is considered a match with the other Layer. If two Layers have differing -// types, they don't match regardless of the contents. If two Layers have the -// same type then the fields in the Layer are pairwise compared. Fields that are -// nil always match. Two non-nil fields only match if they point to equal -// values. diff returns an empty string if and only if *ls and other match. -func (ls *Layers) diff(other Layers) string { - var allDiffs []layerDiff - // Check the cases where one list is longer than the other, where one or both - // elements are nil, where the sides have different types, and where the sides - // have the same type. - for i := 0; i < len(*ls) || i < len(other); i++ { - if i >= len(*ls) { - // Matching ls against other where other is longer than ls. missing - // matches everything so we just include a label without any rows. Having - // no rows is a sign that there was no diff. - allDiffs = append(allDiffs, layerDiff{ - label: "missing matches " + layerType(other[i]), - }) - continue - } - - if i >= len(other) { - // Matching ls against other where ls is longer than other. missing - // matches everything so we just include a label without any rows. Having - // no rows is a sign that there was no diff. - allDiffs = append(allDiffs, layerDiff{ - label: layerType((*ls)[i]) + " matches missing", - }) - continue - } - - if (*ls)[i] == nil && other[i] == nil { - // Matching ls against other where both elements are nil. nil matches - // everything so we just include a label without any rows. Having no rows - // is a sign that there was no diff. - allDiffs = append(allDiffs, layerDiff{ - label: "nil matches nil", - }) - continue - } - - if (*ls)[i] == nil { - // Matching ls against other where the element in ls is nil. nil matches - // everything so we just include a label without any rows. Having no rows - // is a sign that there was no diff. - allDiffs = append(allDiffs, layerDiff{ - label: "nil matches " + layerType(other[i]), - }) - continue - } - - if other[i] == nil { - // Matching ls against other where the element in other is nil. nil - // matches everything so we just include a label without any rows. Having - // no rows is a sign that there was no diff. - allDiffs = append(allDiffs, layerDiff{ - label: layerType((*ls)[i]) + " matches nil", - }) - continue - } - - if reflect.TypeOf((*ls)[i]) == reflect.TypeOf(other[i]) { - // Matching ls against other where both elements have the same type. Match - // each field pairwise and only report a diff if there is a mismatch, - // which is only when both sides are non-nil and have differring values. - diff := diffLayer((*ls)[i], other[i]) - var layerDiffRows []layerDiffRow - for _, d := range diff { - if d.got == "" || d.want == "" || d.got == d.want { - continue - } - layerDiffRows = append(layerDiffRows, layerDiffRow{ - d.field, - d.got, - d.want, - }) - } - if len(layerDiffRows) > 0 { - allDiffs = append(allDiffs, layerDiff{ - label: layerType((*ls)[i]), - rows: layerDiffRows, - }) - } else { - allDiffs = append(allDiffs, layerDiff{ - label: layerType((*ls)[i]) + " matches " + layerType(other[i]), - // Having no rows is a sign that there was no diff. - }) - } - continue - } - // Neither side is nil and the types are different, so we'll display one - // side then the other. - allDiffs = append(allDiffs, layerDiff{ - label: layerType((*ls)[i]) + " doesn't match " + layerType(other[i]), - }) - diff := diffLayer((*ls)[i], (*ls)[i]) - layerDiffRows := []layerDiffRow{} - for _, d := range diff { - if len(d.got) == 0 { - continue - } - layerDiffRows = append(layerDiffRows, layerDiffRow{ - d.field, - d.got, - "", - }) - } - allDiffs = append(allDiffs, layerDiff{ - label: layerType((*ls)[i]), - rows: layerDiffRows, - }) - - layerDiffRows = []layerDiffRow{} - diff = diffLayer(other[i], other[i]) - for _, d := range diff { - if len(d.want) == 0 { - continue - } - layerDiffRows = append(layerDiffRows, layerDiffRow{ - d.field, - "", - d.want, - }) - } - allDiffs = append(allDiffs, layerDiff{ - label: layerType(other[i]), - rows: layerDiffRows, - }) - } - - output := "" - // These are for output formatting. - maxLabelLen, maxFieldLen, maxGotLen, maxWantLen := 0, 0, 0, 0 - foundOne := false - for _, l := range allDiffs { - if len(l.label) > maxLabelLen && len(l.rows) > 0 { - maxLabelLen = len(l.label) - } - if l.rows != nil { - foundOne = true - } - for _, r := range l.rows { - if len(r.field) > maxFieldLen { - maxFieldLen = len(r.field) - } - if l := len(fmt.Sprint(r.got)); l > maxGotLen { - maxGotLen = l - } - if l := len(fmt.Sprint(r.want)); l > maxWantLen { - maxWantLen = l - } - } - } - if !foundOne { - return "" - } - for _, l := range allDiffs { - if len(l.rows) == 0 { - output += "(" + l.label + ")\n" - continue - } - for i, r := range l.rows { - var label string - if i == 0 { - label = l.label + ":" - } - output += fmt.Sprintf( - "%*s %*s %*v %*v\n", - maxLabelLen+1, label, - maxFieldLen+1, r.field+":", - maxGotLen, r.got, - maxWantLen, r.want, - ) - } - } - return output -} - -// merge merges the other Layers into ls. If the other Layers is longer, those -// additional Layer structs are added to ls. The errors from merging are -// collected and returned. -func (ls *Layers) merge(other Layers) error { - var errs error - for i, o := range other { - if i < len(*ls) { - errs = multierr.Combine(errs, (*ls)[i].merge(o)) - } else { - *ls = append(*ls, o) - } - } - return errs -} diff --git a/test/packetimpact/testbench/layers_test.go b/test/packetimpact/testbench/layers_test.go deleted file mode 100644 index 382a983a1..000000000 --- a/test/packetimpact/testbench/layers_test.go +++ /dev/null @@ -1,618 +0,0 @@ -// Copyright 2020 The gVisor Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// http://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -package testbench - -import ( - "bytes" - "net" - "testing" - - "github.com/mohae/deepcopy" - "gvisor.dev/gvisor/pkg/tcpip" - "gvisor.dev/gvisor/pkg/tcpip/header" -) - -func TestLayerMatch(t *testing.T) { - var nilPayload *Payload - noPayload := &Payload{} - emptyPayload := &Payload{Bytes: []byte{}} - fullPayload := &Payload{Bytes: []byte{1, 2, 3}} - emptyTCP := &TCP{SrcPort: Uint16(1234), LayerBase: LayerBase{nextLayer: emptyPayload}} - fullTCP := &TCP{SrcPort: Uint16(1234), LayerBase: LayerBase{nextLayer: fullPayload}} - for _, tt := range []struct { - a, b Layer - want bool - }{ - {nilPayload, nilPayload, true}, - {nilPayload, noPayload, true}, - {nilPayload, emptyPayload, true}, - {nilPayload, fullPayload, true}, - {noPayload, noPayload, true}, - {noPayload, emptyPayload, true}, - {noPayload, fullPayload, true}, - {emptyPayload, emptyPayload, true}, - {emptyPayload, fullPayload, false}, - {fullPayload, fullPayload, true}, - {emptyTCP, fullTCP, true}, - } { - if got := tt.a.match(tt.b); got != tt.want { - t.Errorf("%s.match(%s) = %t, want %t", tt.a, tt.b, got, tt.want) - } - if got := tt.b.match(tt.a); got != tt.want { - t.Errorf("%s.match(%s) = %t, want %t", tt.b, tt.a, got, tt.want) - } - } -} - -func TestLayerMergeMismatch(t *testing.T) { - tcp := &TCP{} - otherTCP := &TCP{} - ipv4 := &IPv4{} - ether := &Ether{} - for _, tt := range []struct { - a, b Layer - success bool - }{ - {tcp, tcp, true}, - {tcp, otherTCP, true}, - {tcp, ipv4, false}, - {tcp, ether, false}, - {tcp, nil, true}, - - {otherTCP, otherTCP, true}, - {otherTCP, ipv4, false}, - {otherTCP, ether, false}, - {otherTCP, nil, true}, - - {ipv4, ipv4, true}, - {ipv4, ether, false}, - {ipv4, nil, true}, - - {ether, ether, true}, - {ether, nil, true}, - } { - if err := tt.a.merge(tt.b); (err == nil) != tt.success { - t.Errorf("%s.merge(%s) got %s, wanted the opposite", tt.a, tt.b, err) - } - if tt.b != nil { - if err := tt.b.merge(tt.a); (err == nil) != tt.success { - t.Errorf("%s.merge(%s) got %s, wanted the opposite", tt.b, tt.a, err) - } - } - } -} - -func TestLayerMerge(t *testing.T) { - zero := Uint32(0) - one := Uint32(1) - two := Uint32(2) - empty := []byte{} - foo := []byte("foo") - bar := []byte("bar") - for _, tt := range []struct { - a, b Layer - want Layer - }{ - {&TCP{AckNum: nil}, &TCP{AckNum: nil}, &TCP{AckNum: nil}}, - {&TCP{AckNum: nil}, &TCP{AckNum: zero}, &TCP{AckNum: zero}}, - {&TCP{AckNum: nil}, &TCP{AckNum: one}, &TCP{AckNum: one}}, - {&TCP{AckNum: nil}, &TCP{AckNum: two}, &TCP{AckNum: two}}, - {&TCP{AckNum: nil}, nil, &TCP{AckNum: nil}}, - - {&TCP{AckNum: zero}, &TCP{AckNum: nil}, &TCP{AckNum: zero}}, - {&TCP{AckNum: zero}, &TCP{AckNum: zero}, &TCP{AckNum: zero}}, - {&TCP{AckNum: zero}, &TCP{AckNum: one}, &TCP{AckNum: one}}, - {&TCP{AckNum: zero}, &TCP{AckNum: two}, &TCP{AckNum: two}}, - {&TCP{AckNum: zero}, nil, &TCP{AckNum: zero}}, - - {&TCP{AckNum: one}, &TCP{AckNum: nil}, &TCP{AckNum: one}}, - {&TCP{AckNum: one}, &TCP{AckNum: zero}, &TCP{AckNum: zero}}, - {&TCP{AckNum: one}, &TCP{AckNum: one}, &TCP{AckNum: one}}, - {&TCP{AckNum: one}, &TCP{AckNum: two}, &TCP{AckNum: two}}, - {&TCP{AckNum: one}, nil, &TCP{AckNum: one}}, - - {&TCP{AckNum: two}, &TCP{AckNum: nil}, &TCP{AckNum: two}}, - {&TCP{AckNum: two}, &TCP{AckNum: zero}, &TCP{AckNum: zero}}, - {&TCP{AckNum: two}, &TCP{AckNum: one}, &TCP{AckNum: one}}, - {&TCP{AckNum: two}, &TCP{AckNum: two}, &TCP{AckNum: two}}, - {&TCP{AckNum: two}, nil, &TCP{AckNum: two}}, - - {&Payload{Bytes: nil}, &Payload{Bytes: nil}, &Payload{Bytes: nil}}, - {&Payload{Bytes: nil}, &Payload{Bytes: empty}, &Payload{Bytes: empty}}, - {&Payload{Bytes: nil}, &Payload{Bytes: foo}, &Payload{Bytes: foo}}, - {&Payload{Bytes: nil}, &Payload{Bytes: bar}, &Payload{Bytes: bar}}, - {&Payload{Bytes: nil}, nil, &Payload{Bytes: nil}}, - - {&Payload{Bytes: empty}, &Payload{Bytes: nil}, &Payload{Bytes: empty}}, - {&Payload{Bytes: empty}, &Payload{Bytes: empty}, &Payload{Bytes: empty}}, - {&Payload{Bytes: empty}, &Payload{Bytes: foo}, &Payload{Bytes: foo}}, - {&Payload{Bytes: empty}, &Payload{Bytes: bar}, &Payload{Bytes: bar}}, - {&Payload{Bytes: empty}, nil, &Payload{Bytes: empty}}, - - {&Payload{Bytes: foo}, &Payload{Bytes: nil}, &Payload{Bytes: foo}}, - {&Payload{Bytes: foo}, &Payload{Bytes: empty}, &Payload{Bytes: empty}}, - {&Payload{Bytes: foo}, &Payload{Bytes: foo}, &Payload{Bytes: foo}}, - {&Payload{Bytes: foo}, &Payload{Bytes: bar}, &Payload{Bytes: bar}}, - {&Payload{Bytes: foo}, nil, &Payload{Bytes: foo}}, - - {&Payload{Bytes: bar}, &Payload{Bytes: nil}, &Payload{Bytes: bar}}, - {&Payload{Bytes: bar}, &Payload{Bytes: empty}, &Payload{Bytes: empty}}, - {&Payload{Bytes: bar}, &Payload{Bytes: foo}, &Payload{Bytes: foo}}, - {&Payload{Bytes: bar}, &Payload{Bytes: bar}, &Payload{Bytes: bar}}, - {&Payload{Bytes: bar}, nil, &Payload{Bytes: bar}}, - } { - a := deepcopy.Copy(tt.a).(Layer) - if err := a.merge(tt.b); err != nil { - t.Errorf("%s.merge(%s) = %s, wanted nil", tt.a, tt.b, err) - continue - } - if a.String() != tt.want.String() { - t.Errorf("%s.merge(%s) merge result got %s, want %s", tt.a, tt.b, a, tt.want) - } - } -} - -func TestLayerStringFormat(t *testing.T) { - for _, tt := range []struct { - name string - l Layer - want string - }{ - { - name: "TCP", - l: &TCP{ - SrcPort: Uint16(34785), - DstPort: Uint16(47767), - SeqNum: Uint32(3452155723), - AckNum: Uint32(2596996163), - DataOffset: Uint8(5), - Flags: Uint8(20), - WindowSize: Uint16(64240), - Checksum: Uint16(0x2e2b), - }, - want: "&testbench.TCP{" + - "SrcPort:34785 " + - "DstPort:47767 " + - "SeqNum:3452155723 " + - "AckNum:2596996163 " + - "DataOffset:5 " + - "Flags:20 " + - "WindowSize:64240 " + - "Checksum:11819" + - "}", - }, - { - name: "UDP", - l: &UDP{ - SrcPort: Uint16(34785), - DstPort: Uint16(47767), - Length: Uint16(12), - }, - want: "&testbench.UDP{" + - "SrcPort:34785 " + - "DstPort:47767 " + - "Length:12" + - "}", - }, - { - name: "IPv4", - l: &IPv4{ - IHL: Uint8(5), - TOS: Uint8(0), - TotalLength: Uint16(44), - ID: Uint16(0), - Flags: Uint8(2), - FragmentOffset: Uint16(0), - TTL: Uint8(64), - Protocol: Uint8(6), - Checksum: Uint16(0x2e2b), - SrcAddr: Address(tcpip.Address([]byte{197, 34, 63, 10})), - DstAddr: Address(tcpip.Address([]byte{197, 34, 63, 20})), - }, - want: "&testbench.IPv4{" + - "IHL:5 " + - "TOS:0 " + - "TotalLength:44 " + - "ID:0 " + - "Flags:2 " + - "FragmentOffset:0 " + - "TTL:64 " + - "Protocol:6 " + - "Checksum:11819 " + - "SrcAddr:197.34.63.10 " + - "DstAddr:197.34.63.20" + - "}", - }, - { - name: "Ether", - l: &Ether{ - SrcAddr: LinkAddress(tcpip.LinkAddress([]byte{0x02, 0x42, 0xc5, 0x22, 0x3f, 0x0a})), - DstAddr: LinkAddress(tcpip.LinkAddress([]byte{0x02, 0x42, 0xc5, 0x22, 0x3f, 0x14})), - Type: NetworkProtocolNumber(4), - }, - want: "&testbench.Ether{" + - "SrcAddr:02:42:c5:22:3f:0a " + - "DstAddr:02:42:c5:22:3f:14 " + - "Type:4" + - "}", - }, - { - name: "Payload", - l: &Payload{ - Bytes: []byte("Hooray for packetimpact."), - }, - want: "&testbench.Payload{Bytes:\n" + - "00000000 48 6f 6f 72 61 79 20 66 6f 72 20 70 61 63 6b 65 |Hooray for packe|\n" + - "00000010 74 69 6d 70 61 63 74 2e |timpact.|\n" + - "}", - }, - } { - t.Run(tt.name, func(t *testing.T) { - if got := tt.l.String(); got != tt.want { - t.Errorf("%s.String() = %s, want: %s", tt.name, got, tt.want) - } - }) - } -} - -func TestConnectionMatch(t *testing.T) { - conn := Connection{ - layerStates: []layerState{ðerState{}}, - } - protoNum0 := tcpip.NetworkProtocolNumber(0) - protoNum1 := tcpip.NetworkProtocolNumber(1) - for _, tt := range []struct { - description string - override, received Layers - wantMatch bool - }{ - { - description: "shorter override", - override: []Layer{&Ether{}}, - received: []Layer{&Ether{}, &Payload{Bytes: []byte("hello")}}, - wantMatch: true, - }, - { - description: "longer override", - override: []Layer{&Ether{}, &Payload{Bytes: []byte("hello")}}, - received: []Layer{&Ether{}}, - wantMatch: false, - }, - { - description: "ether layer mismatch", - override: []Layer{&Ether{Type: &protoNum0}}, - received: []Layer{&Ether{Type: &protoNum1}}, - wantMatch: false, - }, - { - description: "both nil", - override: nil, - received: nil, - wantMatch: false, - }, - { - description: "nil override", - override: nil, - received: []Layer{&Ether{}}, - wantMatch: true, - }, - } { - t.Run(tt.description, func(t *testing.T) { - if gotMatch := conn.match(tt.override, tt.received); gotMatch != tt.wantMatch { - t.Fatalf("conn.match(%s, %s) = %t, want %t", tt.override, tt.received, gotMatch, tt.wantMatch) - } - }) - } -} - -func TestLayersDiff(t *testing.T) { - for _, tt := range []struct { - x, y Layers - want string - }{ - { - Layers{&Ether{Type: NetworkProtocolNumber(12)}, &TCP{DataOffset: Uint8(5), SeqNum: Uint32(5)}}, - Layers{&Ether{Type: NetworkProtocolNumber(13)}, &TCP{DataOffset: Uint8(7), SeqNum: Uint32(6)}}, - "Ether: Type: 12 13\n" + - " TCP: SeqNum: 5 6\n" + - " DataOffset: 5 7\n", - }, - { - Layers{&Ether{Type: NetworkProtocolNumber(12)}, &UDP{SrcPort: Uint16(123)}}, - Layers{&Ether{Type: NetworkProtocolNumber(13)}, &TCP{DataOffset: Uint8(7), SeqNum: Uint32(6)}}, - "Ether: Type: 12 13\n" + - "(UDP doesn't match TCP)\n" + - " UDP: SrcPort: 123 \n" + - " TCP: SeqNum: 6\n" + - " DataOffset: 7\n", - }, - { - Layers{&UDP{SrcPort: Uint16(123)}}, - Layers{&Ether{Type: NetworkProtocolNumber(13)}, &TCP{DataOffset: Uint8(7), SeqNum: Uint32(6)}}, - "(UDP doesn't match Ether)\n" + - " UDP: SrcPort: 123 \n" + - "Ether: Type: 13\n" + - "(missing matches TCP)\n", - }, - { - Layers{nil, &UDP{SrcPort: Uint16(123)}}, - Layers{&Ether{Type: NetworkProtocolNumber(13)}, &TCP{DataOffset: Uint8(7), SeqNum: Uint32(6)}}, - "(nil matches Ether)\n" + - "(UDP doesn't match TCP)\n" + - "UDP: SrcPort: 123 \n" + - "TCP: SeqNum: 6\n" + - " DataOffset: 7\n", - }, - { - Layers{&Ether{Type: NetworkProtocolNumber(13)}, &IPv4{IHL: Uint8(4)}, &TCP{DataOffset: Uint8(7), SeqNum: Uint32(6)}}, - Layers{&Ether{Type: NetworkProtocolNumber(13)}, &IPv4{IHL: Uint8(6)}, &TCP{DataOffset: Uint8(7), SeqNum: Uint32(6)}}, - "(Ether matches Ether)\n" + - "IPv4: IHL: 4 6\n" + - "(TCP matches TCP)\n", - }, - { - Layers{&Payload{Bytes: []byte("foo")}}, - Layers{&Payload{Bytes: []byte("bar")}}, - "Payload: Bytes: [102 111 111] [98 97 114]\n", - }, - { - Layers{&Payload{Bytes: []byte("")}}, - Layers{&Payload{}}, - "", - }, - { - Layers{&Payload{Bytes: []byte("")}}, - Layers{&Payload{Bytes: []byte("")}}, - "", - }, - { - Layers{&UDP{}}, - Layers{&TCP{}}, - "(UDP doesn't match TCP)\n" + - "(UDP)\n" + - "(TCP)\n", - }, - } { - if got := tt.x.diff(tt.y); got != tt.want { - t.Errorf("%s.diff(%s) = %q, want %q", tt.x, tt.y, got, tt.want) - } - if tt.x.match(tt.y) != (tt.x.diff(tt.y) == "") { - t.Errorf("match and diff of %s and %s disagree", tt.x, tt.y) - } - if tt.y.match(tt.x) != (tt.y.diff(tt.x) == "") { - t.Errorf("match and diff of %s and %s disagree", tt.y, tt.x) - } - } -} - -func TestTCPOptions(t *testing.T) { - for _, tt := range []struct { - description string - wantBytes []byte - wantLayers Layers - }{ - { - description: "without payload", - wantBytes: []byte{ - // IPv4 Header - 0x45, 0x00, 0x00, 0x2c, 0x00, 0x01, 0x00, 0x00, 0x40, 0x06, - 0xf9, 0x77, 0xc0, 0xa8, 0x00, 0x02, 0xc0, 0xa8, 0x00, 0x01, - // TCP Header - 0x30, 0x39, 0xd4, 0x31, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, - 0x00, 0x00, 0x60, 0x02, 0x20, 0x00, 0xf5, 0x1c, 0x00, 0x00, - // WindowScale Option - 0x03, 0x03, 0x02, - // NOP Option - 0x00, - }, - wantLayers: []Layer{ - &IPv4{ - IHL: Uint8(20), - TOS: Uint8(0), - TotalLength: Uint16(44), - ID: Uint16(1), - Flags: Uint8(0), - FragmentOffset: Uint16(0), - TTL: Uint8(64), - Protocol: Uint8(uint8(header.TCPProtocolNumber)), - Checksum: Uint16(0xf977), - SrcAddr: Address(tcpip.Address(net.ParseIP("192.168.0.2").To4())), - DstAddr: Address(tcpip.Address(net.ParseIP("192.168.0.1").To4())), - }, - &TCP{ - SrcPort: Uint16(12345), - DstPort: Uint16(54321), - SeqNum: Uint32(0), - AckNum: Uint32(0), - Flags: Uint8(header.TCPFlagSyn), - WindowSize: Uint16(8192), - Checksum: Uint16(0xf51c), - UrgentPointer: Uint16(0), - Options: []byte{3, 3, 2, 0}, - }, - &Payload{Bytes: nil}, - }, - }, - { - description: "with payload", - wantBytes: []byte{ - // IPv4 header - 0x45, 0x00, 0x00, 0x37, 0x00, 0x01, 0x00, 0x00, 0x40, 0x06, - 0xf9, 0x6c, 0xc0, 0xa8, 0x00, 0x02, 0xc0, 0xa8, 0x00, 0x01, - // TCP header - 0x30, 0x39, 0xd4, 0x31, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, - 0x00, 0x00, 0x60, 0x02, 0x20, 0x00, 0xe5, 0x21, 0x00, 0x00, - // WindowScale Option - 0x03, 0x03, 0x02, - // NOP Option - 0x00, - // Payload: "Sample Data" - 0x53, 0x61, 0x6d, 0x70, 0x6c, 0x65, 0x20, 0x44, 0x61, 0x74, 0x61, - }, - wantLayers: []Layer{ - &IPv4{ - IHL: Uint8(20), - TOS: Uint8(0), - TotalLength: Uint16(55), - ID: Uint16(1), - Flags: Uint8(0), - FragmentOffset: Uint16(0), - TTL: Uint8(64), - Protocol: Uint8(uint8(header.TCPProtocolNumber)), - Checksum: Uint16(0xf96c), - SrcAddr: Address(tcpip.Address(net.ParseIP("192.168.0.2").To4())), - DstAddr: Address(tcpip.Address(net.ParseIP("192.168.0.1").To4())), - }, - &TCP{ - SrcPort: Uint16(12345), - DstPort: Uint16(54321), - SeqNum: Uint32(0), - AckNum: Uint32(0), - Flags: Uint8(header.TCPFlagSyn), - WindowSize: Uint16(8192), - Checksum: Uint16(0xe521), - UrgentPointer: Uint16(0), - Options: []byte{3, 3, 2, 0}, - }, - &Payload{Bytes: []byte("Sample Data")}, - }, - }, - } { - t.Run(tt.description, func(t *testing.T) { - layers := parse(parseIPv4, tt.wantBytes) - if !layers.match(tt.wantLayers) { - t.Fatalf("match failed with diff: %s", layers.diff(tt.wantLayers)) - } - gotBytes, err := layers.ToBytes() - if err != nil { - t.Fatalf("ToBytes() failed on %s: %s", &layers, err) - } - if !bytes.Equal(tt.wantBytes, gotBytes) { - t.Fatalf("mismatching bytes, gotBytes: %x, wantBytes: %x", gotBytes, tt.wantBytes) - } - }) - } -} - -func TestIPv6ExtHdrOptions(t *testing.T) { - for _, tt := range []struct { - description string - wantBytes []byte - wantLayers Layers - }{ - { - description: "IPv6/HopByHop", - wantBytes: []byte{ - // IPv6 Header - 0x60, 0x00, 0x00, 0x00, 0x00, 0x08, 0x00, 0x40, 0x00, 0x00, - 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, - 0x00, 0x00, 0x00, 0x01, 0xfe, 0x80, 0x00, 0x00, 0x00, 0x00, - 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xde, 0xad, 0xbe, 0xef, - // HopByHop Options - 0x3b, 0x00, 0x05, 0x02, 0x00, 0x00, 0x01, 0x00, - }, - wantLayers: []Layer{ - &IPv6{ - SrcAddr: Address(tcpip.Address(net.ParseIP("::1"))), - DstAddr: Address(tcpip.Address(net.ParseIP("fe80::dead:beef"))), - }, - &IPv6HopByHopOptionsExtHdr{ - NextHeader: IPv6ExtHdrIdent(header.IPv6NoNextHeaderIdentifier), - Options: []byte{0x05, 0x02, 0x00, 0x00, 0x01, 0x00}, - }, - &Payload{ - Bytes: nil, - }, - }, - }, - { - description: "IPv6/HopByHop/Payload", - wantBytes: []byte{ - // IPv6 Header - 0x60, 0x00, 0x00, 0x00, 0x00, 0x13, 0x00, 0x40, 0x00, 0x00, - 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, - 0x00, 0x00, 0x00, 0x01, 0xfe, 0x80, 0x00, 0x00, 0x00, 0x00, - 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xde, 0xad, 0xbe, 0xef, - // HopByHop Options - 0x3b, 0x00, 0x05, 0x02, 0x00, 0x00, 0x01, 0x00, - // Sample Data - 0x53, 0x61, 0x6d, 0x70, 0x6c, 0x65, 0x20, 0x44, 0x61, 0x74, 0x61, - }, - wantLayers: []Layer{ - &IPv6{ - SrcAddr: Address(tcpip.Address(net.ParseIP("::1"))), - DstAddr: Address(tcpip.Address(net.ParseIP("fe80::dead:beef"))), - }, - &IPv6HopByHopOptionsExtHdr{ - NextHeader: IPv6ExtHdrIdent(header.IPv6NoNextHeaderIdentifier), - Options: []byte{0x05, 0x02, 0x00, 0x00, 0x01, 0x00}, - }, - &Payload{ - Bytes: []byte("Sample Data"), - }, - }, - }, - { - description: "IPv6/HopByHop/Destination/ICMPv6", - wantBytes: []byte{ - // IPv6 Header - 0x60, 0x00, 0x00, 0x00, 0x00, 0x18, 0x00, 0x40, 0x00, 0x00, - 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, - 0x00, 0x00, 0x00, 0x01, 0xfe, 0x80, 0x00, 0x00, 0x00, 0x00, - 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xde, 0xad, 0xbe, 0xef, - // HopByHop Options - 0x3c, 0x00, 0x05, 0x02, 0x00, 0x00, 0x01, 0x00, - // Destination Options - 0x3a, 0x00, 0x05, 0x02, 0x00, 0x00, 0x01, 0x00, - // ICMPv6 Param Problem - 0x04, 0x00, 0x5f, 0x98, 0x00, 0x00, 0x00, 0x06, - }, - wantLayers: []Layer{ - &IPv6{ - SrcAddr: Address(tcpip.Address(net.ParseIP("::1"))), - DstAddr: Address(tcpip.Address(net.ParseIP("fe80::dead:beef"))), - }, - &IPv6HopByHopOptionsExtHdr{ - NextHeader: IPv6ExtHdrIdent(header.IPv6DestinationOptionsExtHdrIdentifier), - Options: []byte{0x05, 0x02, 0x00, 0x00, 0x01, 0x00}, - }, - &IPv6DestinationOptionsExtHdr{ - NextHeader: IPv6ExtHdrIdent(header.IPv6ExtensionHeaderIdentifier(header.ICMPv6ProtocolNumber)), - Options: []byte{0x05, 0x02, 0x00, 0x00, 0x01, 0x00}, - }, - &ICMPv6{ - Type: ICMPv6Type(header.ICMPv6ParamProblem), - Code: Byte(0), - Checksum: Uint16(0x5f98), - NDPPayload: []byte{0x00, 0x00, 0x00, 0x06}, - }, - }, - }, - } { - t.Run(tt.description, func(t *testing.T) { - layers := parse(parseIPv6, tt.wantBytes) - if !layers.match(tt.wantLayers) { - t.Fatalf("match failed with diff: %s", layers.diff(tt.wantLayers)) - } - gotBytes, err := layers.ToBytes() - if err != nil { - t.Fatalf("ToBytes() failed on %s: %s", &layers, err) - } - if !bytes.Equal(tt.wantBytes, gotBytes) { - t.Fatalf("mismatching bytes, gotBytes: %x, wantBytes: %x", gotBytes, tt.wantBytes) - } - }) - } -} diff --git a/test/packetimpact/testbench/rawsockets.go b/test/packetimpact/testbench/rawsockets.go deleted file mode 100644 index 278229b7e..000000000 --- a/test/packetimpact/testbench/rawsockets.go +++ /dev/null @@ -1,178 +0,0 @@ -// Copyright 2020 The gVisor Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// http://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -package testbench - -import ( - "encoding/binary" - "fmt" - "math" - "net" - "testing" - "time" - - "golang.org/x/sys/unix" - "gvisor.dev/gvisor/pkg/usermem" -) - -// Sniffer can sniff raw packets on the wire. -type Sniffer struct { - t *testing.T - fd int -} - -func htons(x uint16) uint16 { - buf := [2]byte{} - binary.BigEndian.PutUint16(buf[:], x) - return usermem.ByteOrder.Uint16(buf[:]) -} - -// NewSniffer creates a Sniffer connected to *device. -func NewSniffer(t *testing.T) (Sniffer, error) { - snifferFd, err := unix.Socket(unix.AF_PACKET, unix.SOCK_RAW, int(htons(unix.ETH_P_ALL))) - if err != nil { - return Sniffer{}, err - } - if err := unix.SetsockoptInt(snifferFd, unix.SOL_SOCKET, unix.SO_RCVBUFFORCE, 1); err != nil { - t.Fatalf("can't set sockopt SO_RCVBUFFORCE to 1: %s", err) - } - if err := unix.SetsockoptInt(snifferFd, unix.SOL_SOCKET, unix.SO_RCVBUF, 1e7); err != nil { - t.Fatalf("can't setsockopt SO_RCVBUF to 10M: %s", err) - } - return Sniffer{ - t: t, - fd: snifferFd, - }, nil -} - -// maxReadSize should be large enough for the maximum frame size in bytes. If a -// packet too large for the buffer arrives, the test will get a fatal error. -const maxReadSize int = 65536 - -// Recv tries to read one frame until the timeout is up. -func (s *Sniffer) Recv(timeout time.Duration) []byte { - deadline := time.Now().Add(timeout) - for { - timeout = deadline.Sub(time.Now()) - if timeout <= 0 { - return nil - } - whole, frac := math.Modf(timeout.Seconds()) - tv := unix.Timeval{ - Sec: int64(whole), - Usec: int64(frac * float64(time.Microsecond/time.Second)), - } - - if err := unix.SetsockoptTimeval(s.fd, unix.SOL_SOCKET, unix.SO_RCVTIMEO, &tv); err != nil { - s.t.Fatalf("can't setsockopt SO_RCVTIMEO: %s", err) - } - - buf := make([]byte, maxReadSize) - nread, _, err := unix.Recvfrom(s.fd, buf, unix.MSG_TRUNC) - if err == unix.EINTR || err == unix.EAGAIN { - // There was a timeout. - continue - } - if err != nil { - s.t.Fatalf("can't read: %s", err) - } - if nread > maxReadSize { - s.t.Fatalf("received a truncated frame of %d bytes", nread) - } - return buf[:nread] - } -} - -// Drain drains the Sniffer's socket receive buffer by receiving until there's -// nothing else to receive. -func (s *Sniffer) Drain() { - s.t.Helper() - flags, err := unix.FcntlInt(uintptr(s.fd), unix.F_GETFL, 0) - if err != nil { - s.t.Fatalf("failed to get sniffer socket fd flags: %s", err) - } - if _, err := unix.FcntlInt(uintptr(s.fd), unix.F_SETFL, flags|unix.O_NONBLOCK); err != nil { - s.t.Fatalf("failed to make sniffer socket non-blocking: %s", err) - } - for { - buf := make([]byte, maxReadSize) - _, _, err := unix.Recvfrom(s.fd, buf, unix.MSG_TRUNC) - if err == unix.EINTR || err == unix.EAGAIN || err == unix.EWOULDBLOCK { - break - } - } - if _, err := unix.FcntlInt(uintptr(s.fd), unix.F_SETFL, flags); err != nil { - s.t.Fatalf("failed to restore sniffer socket fd flags: %s", err) - } -} - -// close the socket that Sniffer is using. -func (s *Sniffer) close() error { - if err := unix.Close(s.fd); err != nil { - return fmt.Errorf("can't close sniffer socket: %w", err) - } - s.fd = -1 - return nil -} - -// Injector can inject raw frames. -type Injector struct { - t *testing.T - fd int -} - -// NewInjector creates a new injector on *device. -func NewInjector(t *testing.T) (Injector, error) { - ifInfo, err := net.InterfaceByName(Device) - if err != nil { - return Injector{}, err - } - - var haddr [8]byte - copy(haddr[:], ifInfo.HardwareAddr) - sa := unix.SockaddrLinklayer{ - Protocol: unix.ETH_P_IP, - Ifindex: ifInfo.Index, - Halen: uint8(len(ifInfo.HardwareAddr)), - Addr: haddr, - } - - injectFd, err := unix.Socket(unix.AF_PACKET, unix.SOCK_RAW, int(htons(unix.ETH_P_ALL))) - if err != nil { - return Injector{}, err - } - if err := unix.Bind(injectFd, &sa); err != nil { - return Injector{}, err - } - return Injector{ - t: t, - fd: injectFd, - }, nil -} - -// Send a raw frame. -func (i *Injector) Send(b []byte) { - if _, err := unix.Write(i.fd, b); err != nil { - i.t.Fatalf("can't write: %s of len %d", err, len(b)) - } -} - -// close the underlying socket. -func (i *Injector) close() error { - if err := unix.Close(i.fd); err != nil { - return fmt.Errorf("can't close sniffer socket: %w", err) - } - i.fd = -1 - return nil -} diff --git a/test/packetimpact/testbench/testbench.go b/test/packetimpact/testbench/testbench.go deleted file mode 100644 index d64f32a5b..000000000 --- a/test/packetimpact/testbench/testbench.go +++ /dev/null @@ -1,106 +0,0 @@ -// Copyright 2020 The gVisor Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// http://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -package testbench - -import ( - "flag" - "fmt" - "math/rand" - "net" - "os/exec" - "testing" - "time" - - "gvisor.dev/gvisor/test/packetimpact/netdevs" -) - -var ( - // DUTType is the type of device under test. - DUTType = "" - // Device is the local device on the test network. - Device = "" - // LocalIPv4 is the local IPv4 address on the test network. - LocalIPv4 = "" - // LocalIPv6 is the local IPv6 address on the test network. - LocalIPv6 = "" - // LocalMAC is the local MAC address on the test network. - LocalMAC = "" - // POSIXServerIP is the POSIX server's IP address on the control network. - POSIXServerIP = "" - // POSIXServerPort is the UDP port the POSIX server is bound to on the - // control network. - POSIXServerPort = 40000 - // RemoteIPv4 is the DUT's IPv4 address on the test network. - RemoteIPv4 = "" - // RemoteIPv6 is the DUT's IPv6 address on the test network. - RemoteIPv6 = "" - // RemoteMAC is the DUT's MAC address on the test network. - RemoteMAC = "" - // RPCKeepalive is the gRPC keepalive. - RPCKeepalive = 10 * time.Second - // RPCTimeout is the gRPC timeout. - RPCTimeout = 100 * time.Millisecond -) - -// RegisterFlags defines flags and associates them with the package-level -// exported variables above. It should be called by tests in their init -// functions. -func RegisterFlags(fs *flag.FlagSet) { - fs.StringVar(&POSIXServerIP, "posix_server_ip", POSIXServerIP, "ip address to listen to for UDP commands") - fs.IntVar(&POSIXServerPort, "posix_server_port", POSIXServerPort, "port to listen to for UDP commands") - fs.DurationVar(&RPCTimeout, "rpc_timeout", RPCTimeout, "gRPC timeout") - fs.DurationVar(&RPCKeepalive, "rpc_keepalive", RPCKeepalive, "gRPC keepalive") - fs.StringVar(&LocalIPv4, "local_ipv4", LocalIPv4, "local IPv4 address for test packets") - fs.StringVar(&RemoteIPv4, "remote_ipv4", RemoteIPv4, "remote IPv4 address for test packets") - fs.StringVar(&RemoteIPv6, "remote_ipv6", RemoteIPv6, "remote IPv6 address for test packets") - fs.StringVar(&RemoteMAC, "remote_mac", RemoteMAC, "remote mac address for test packets") - fs.StringVar(&Device, "device", Device, "local device for test packets") - fs.StringVar(&DUTType, "dut_type", DUTType, "type of device under test") -} - -// genPseudoFlags populates flag-like global config based on real flags. -// -// genPseudoFlags must only be called after flag.Parse. -func genPseudoFlags() error { - out, err := exec.Command("ip", "addr", "show").CombinedOutput() - if err != nil { - return fmt.Errorf("listing devices: %q: %w", string(out), err) - } - devs, err := netdevs.ParseDevices(string(out)) - if err != nil { - return fmt.Errorf("parsing devices: %w", err) - } - - _, deviceInfo, err := netdevs.FindDeviceByIP(net.ParseIP(LocalIPv4), devs) - if err != nil { - return fmt.Errorf("can't find deviceInfo: %w", err) - } - - LocalMAC = deviceInfo.MAC.String() - LocalIPv6 = deviceInfo.IPv6Addr.String() - - return nil -} - -// GenerateRandomPayload generates a random byte slice of the specified length, -// causing a fatal test failure if it is unable to do so. -func GenerateRandomPayload(t *testing.T, n int) []byte { - t.Helper() - buf := make([]byte, n) - if _, err := rand.Read(buf); err != nil { - t.Fatalf("rand.Read(buf) failed: %s", err) - } - return buf -} diff --git a/test/packetimpact/tests/BUILD b/test/packetimpact/tests/BUILD deleted file mode 100644 index 3ecbe83eb..000000000 --- a/test/packetimpact/tests/BUILD +++ /dev/null @@ -1,264 +0,0 @@ -load("//test/packetimpact/runner:defs.bzl", "packetimpact_go_test") - -package( - default_visibility = ["//test/packetimpact:__subpackages__"], - licenses = ["notice"], -) - -packetimpact_go_test( - name = "fin_wait2_timeout", - srcs = ["fin_wait2_timeout_test.go"], - deps = [ - "//pkg/tcpip/header", - "//test/packetimpact/testbench", - "@org_golang_x_sys//unix:go_default_library", - ], -) - -packetimpact_go_test( - name = "ipv4_id_uniqueness", - srcs = ["ipv4_id_uniqueness_test.go"], - deps = [ - "//pkg/abi/linux", - "//pkg/tcpip/header", - "//test/packetimpact/testbench", - "@org_golang_x_sys//unix:go_default_library", - ], -) - -packetimpact_go_test( - name = "udp_recv_multicast", - srcs = ["udp_recv_multicast_test.go"], - # TODO(b/152813495): Fix netstack then remove the line below. - expect_netstack_failure = True, - deps = [ - "//pkg/tcpip", - "//pkg/tcpip/header", - "//test/packetimpact/testbench", - "@org_golang_x_sys//unix:go_default_library", - ], -) - -packetimpact_go_test( - name = "udp_icmp_error_propagation", - srcs = ["udp_icmp_error_propagation_test.go"], - deps = [ - "//pkg/tcpip", - "//pkg/tcpip/header", - "//test/packetimpact/testbench", - "@org_golang_x_sys//unix:go_default_library", - ], -) - -packetimpact_go_test( - name = "tcp_reordering", - srcs = ["tcp_reordering_test.go"], - # TODO(b/139368047): Fix netstack then remove the line below. - expect_netstack_failure = True, - deps = [ - "//pkg/tcpip/header", - "//pkg/tcpip/seqnum", - "//test/packetimpact/testbench", - "@org_golang_x_sys//unix:go_default_library", - ], -) - -packetimpact_go_test( - name = "tcp_window_shrink", - srcs = ["tcp_window_shrink_test.go"], - deps = [ - "//pkg/tcpip/header", - "//test/packetimpact/testbench", - "@org_golang_x_sys//unix:go_default_library", - ], -) - -packetimpact_go_test( - name = "tcp_zero_window_probe", - srcs = ["tcp_zero_window_probe_test.go"], - deps = [ - "//pkg/tcpip/header", - "//test/packetimpact/testbench", - "@org_golang_x_sys//unix:go_default_library", - ], -) - -packetimpact_go_test( - name = "tcp_zero_window_probe_retransmit", - srcs = ["tcp_zero_window_probe_retransmit_test.go"], - deps = [ - "//pkg/tcpip/header", - "//test/packetimpact/testbench", - "@org_golang_x_sys//unix:go_default_library", - ], -) - -packetimpact_go_test( - name = "tcp_zero_window_probe_usertimeout", - srcs = ["tcp_zero_window_probe_usertimeout_test.go"], - deps = [ - "//pkg/tcpip/header", - "//test/packetimpact/testbench", - "@org_golang_x_sys//unix:go_default_library", - ], -) - -packetimpact_go_test( - name = "tcp_retransmits", - srcs = ["tcp_retransmits_test.go"], - deps = [ - "//pkg/tcpip/header", - "//test/packetimpact/testbench", - "@org_golang_x_sys//unix:go_default_library", - ], -) - -packetimpact_go_test( - name = "tcp_outside_the_window", - srcs = ["tcp_outside_the_window_test.go"], - deps = [ - "//pkg/tcpip/header", - "//pkg/tcpip/seqnum", - "//test/packetimpact/testbench", - "@org_golang_x_sys//unix:go_default_library", - ], -) - -packetimpact_go_test( - name = "tcp_noaccept_close_rst", - srcs = ["tcp_noaccept_close_rst_test.go"], - deps = [ - "//pkg/tcpip/header", - "//test/packetimpact/testbench", - "@org_golang_x_sys//unix:go_default_library", - ], -) - -packetimpact_go_test( - name = "tcp_send_window_sizes_piggyback", - srcs = ["tcp_send_window_sizes_piggyback_test.go"], - deps = [ - "//pkg/tcpip/header", - "//test/packetimpact/testbench", - "@org_golang_x_sys//unix:go_default_library", - ], -) - -packetimpact_go_test( - name = "tcp_close_wait_ack", - srcs = ["tcp_close_wait_ack_test.go"], - deps = [ - "//pkg/tcpip/header", - "//pkg/tcpip/seqnum", - "//test/packetimpact/testbench", - "@org_golang_x_sys//unix:go_default_library", - ], -) - -packetimpact_go_test( - name = "tcp_paws_mechanism", - srcs = ["tcp_paws_mechanism_test.go"], - # TODO(b/156682000): Fix netstack then remove the line below. - expect_netstack_failure = True, - deps = [ - "//pkg/tcpip/header", - "//pkg/tcpip/seqnum", - "//test/packetimpact/testbench", - "@org_golang_x_sys//unix:go_default_library", - ], -) - -packetimpact_go_test( - name = "tcp_user_timeout", - srcs = ["tcp_user_timeout_test.go"], - deps = [ - "//pkg/tcpip/header", - "//test/packetimpact/testbench", - "@org_golang_x_sys//unix:go_default_library", - ], -) - -packetimpact_go_test( - name = "tcp_queue_receive_in_syn_sent", - srcs = ["tcp_queue_receive_in_syn_sent_test.go"], - deps = [ - "//pkg/tcpip/header", - "//test/packetimpact/testbench", - "@org_golang_x_sys//unix:go_default_library", - ], -) - -packetimpact_go_test( - name = "tcp_synsent_reset", - srcs = ["tcp_synsent_reset_test.go"], - deps = [ - "//pkg/tcpip/header", - "//test/packetimpact/testbench", - "@org_golang_x_sys//unix:go_default_library", - ], -) - -packetimpact_go_test( - name = "tcp_synrcvd_reset", - srcs = ["tcp_synrcvd_reset_test.go"], - deps = [ - "//pkg/tcpip/header", - "//test/packetimpact/testbench", - "@org_golang_x_sys//unix:go_default_library", - ], -) - -packetimpact_go_test( - name = "tcp_cork_mss", - srcs = ["tcp_cork_mss_test.go"], - deps = [ - "//pkg/tcpip/header", - "//test/packetimpact/testbench", - "@org_golang_x_sys//unix:go_default_library", - ], -) - -packetimpact_go_test( - name = "tcp_handshake_window_size", - srcs = ["tcp_handshake_window_size_test.go"], - deps = [ - "//pkg/tcpip/header", - "//test/packetimpact/testbench", - "@org_golang_x_sys//unix:go_default_library", - ], -) - -packetimpact_go_test( - name = "icmpv6_param_problem", - srcs = ["icmpv6_param_problem_test.go"], - # TODO(b/153485026): Fix netstack then remove the line below. - expect_netstack_failure = True, - deps = [ - "//pkg/tcpip", - "//pkg/tcpip/header", - "//test/packetimpact/testbench", - "@org_golang_x_sys//unix:go_default_library", - ], -) - -packetimpact_go_test( - name = "ipv6_unknown_options_action", - srcs = ["ipv6_unknown_options_action_test.go"], - # TODO(b/159928940): Fix netstack then remove the line below. - expect_netstack_failure = True, - deps = [ - "//pkg/tcpip", - "//pkg/tcpip/header", - "//test/packetimpact/testbench", - "@org_golang_x_sys//unix:go_default_library", - ], -) - -packetimpact_go_test( - name = "udp_send_recv_dgram", - srcs = ["udp_send_recv_dgram_test.go"], - deps = [ - "//test/packetimpact/testbench", - "@org_golang_x_sys//unix:go_default_library", - ], -) diff --git a/test/packetimpact/tests/fin_wait2_timeout_test.go b/test/packetimpact/tests/fin_wait2_timeout_test.go deleted file mode 100644 index 407565078..000000000 --- a/test/packetimpact/tests/fin_wait2_timeout_test.go +++ /dev/null @@ -1,75 +0,0 @@ -// Copyright 2020 The gVisor Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// http://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -package fin_wait2_timeout_test - -import ( - "flag" - "testing" - "time" - - "golang.org/x/sys/unix" - "gvisor.dev/gvisor/pkg/tcpip/header" - "gvisor.dev/gvisor/test/packetimpact/testbench" -) - -func init() { - testbench.RegisterFlags(flag.CommandLine) -} - -func TestFinWait2Timeout(t *testing.T) { - for _, tt := range []struct { - description string - linger2 bool - }{ - {"WithLinger2", true}, - {"WithoutLinger2", false}, - } { - t.Run(tt.description, func(t *testing.T) { - dut := testbench.NewDUT(t) - defer dut.TearDown() - listenFd, remotePort := dut.CreateListener(unix.SOCK_STREAM, unix.IPPROTO_TCP, 1) - defer dut.Close(listenFd) - conn := testbench.NewTCPIPv4(t, testbench.TCP{DstPort: &remotePort}, testbench.TCP{SrcPort: &remotePort}) - defer conn.Close() - conn.Connect() - - acceptFd, _ := dut.Accept(listenFd) - if tt.linger2 { - tv := unix.Timeval{Sec: 1, Usec: 0} - dut.SetSockOptTimeval(acceptFd, unix.SOL_TCP, unix.TCP_LINGER2, &tv) - } - dut.Close(acceptFd) - - if _, err := conn.Expect(testbench.TCP{Flags: testbench.Uint8(header.TCPFlagFin | header.TCPFlagAck)}, time.Second); err != nil { - t.Fatalf("expected a FIN-ACK within 1 second but got none: %s", err) - } - conn.Send(testbench.TCP{Flags: testbench.Uint8(header.TCPFlagAck)}) - - time.Sleep(5 * time.Second) - conn.Drain() - - conn.Send(testbench.TCP{Flags: testbench.Uint8(header.TCPFlagAck)}) - if tt.linger2 { - if _, err := conn.Expect(testbench.TCP{Flags: testbench.Uint8(header.TCPFlagRst)}, time.Second); err != nil { - t.Fatalf("expected a RST packet within a second but got none: %s", err) - } - } else { - if got, err := conn.Expect(testbench.TCP{Flags: testbench.Uint8(header.TCPFlagRst)}, 10*time.Second); got != nil || err == nil { - t.Fatalf("expected no RST packets within ten seconds but got one: %s", got) - } - } - }) - } -} diff --git a/test/packetimpact/tests/icmpv6_param_problem_test.go b/test/packetimpact/tests/icmpv6_param_problem_test.go deleted file mode 100644 index 4d1d9a7f5..000000000 --- a/test/packetimpact/tests/icmpv6_param_problem_test.go +++ /dev/null @@ -1,78 +0,0 @@ -// Copyright 2020 The gVisor Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// http://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -package icmpv6_param_problem_test - -import ( - "encoding/binary" - "flag" - "testing" - "time" - - "gvisor.dev/gvisor/pkg/tcpip/header" - "gvisor.dev/gvisor/test/packetimpact/testbench" -) - -func init() { - testbench.RegisterFlags(flag.CommandLine) -} - -// TestICMPv6ParamProblemTest sends a packet with a bad next header. The DUT -// should respond with an ICMPv6 Parameter Problem message. -func TestICMPv6ParamProblemTest(t *testing.T) { - dut := testbench.NewDUT(t) - defer dut.TearDown() - conn := testbench.NewIPv6Conn(t, testbench.IPv6{}, testbench.IPv6{}) - defer conn.Close() - ipv6 := testbench.IPv6{ - // 254 is reserved and used for experimentation and testing. This should - // cause an error. - NextHeader: testbench.Uint8(254), - } - icmpv6 := testbench.ICMPv6{ - Type: testbench.ICMPv6Type(header.ICMPv6EchoRequest), - NDPPayload: []byte("hello world"), - } - - toSend := (*testbench.Connection)(&conn).CreateFrame(testbench.Layers{&ipv6}, &icmpv6) - (*testbench.Connection)(&conn).SendFrame(toSend) - - // Build the expected ICMPv6 payload, which includes an index to the - // problematic byte and also the problematic packet as described in - // https://tools.ietf.org/html/rfc4443#page-12 . - ipv6Sent := toSend[1:] - expectedPayload, err := ipv6Sent.ToBytes() - if err != nil { - t.Fatalf("can't convert %s to bytes: %s", ipv6Sent, err) - } - - // The problematic field is the NextHeader. - b := make([]byte, 4) - binary.BigEndian.PutUint32(b, header.IPv6NextHeaderOffset) - expectedPayload = append(b, expectedPayload...) - expectedICMPv6 := testbench.ICMPv6{ - Type: testbench.ICMPv6Type(header.ICMPv6ParamProblem), - NDPPayload: expectedPayload, - } - - paramProblem := testbench.Layers{ - &testbench.Ether{}, - &testbench.IPv6{}, - &expectedICMPv6, - } - timeout := time.Second - if _, err := conn.ExpectFrame(paramProblem, timeout); err != nil { - t.Errorf("expected %s within %s but got none: %s", paramProblem, timeout, err) - } -} diff --git a/test/packetimpact/tests/ipv4_id_uniqueness_test.go b/test/packetimpact/tests/ipv4_id_uniqueness_test.go deleted file mode 100644 index 70f6df5e0..000000000 --- a/test/packetimpact/tests/ipv4_id_uniqueness_test.go +++ /dev/null @@ -1,122 +0,0 @@ -// Copyright 2020 The gVisor Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// http://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -package ipv4_id_uniqueness_test - -import ( - "context" - "flag" - "fmt" - "testing" - "time" - - "golang.org/x/sys/unix" - "gvisor.dev/gvisor/pkg/abi/linux" - "gvisor.dev/gvisor/pkg/tcpip/header" - "gvisor.dev/gvisor/test/packetimpact/testbench" -) - -func init() { - testbench.RegisterFlags(flag.CommandLine) -} - -func recvTCPSegment(conn *testbench.TCPIPv4, expect *testbench.TCP, expectPayload *testbench.Payload) (uint16, error) { - layers, err := conn.ExpectData(expect, expectPayload, time.Second) - if err != nil { - return 0, fmt.Errorf("failed to receive TCP segment: %s", err) - } - if len(layers) < 2 { - return 0, fmt.Errorf("got packet with layers: %v, expected to have at least 2 layers (link and network)", layers) - } - ipv4, ok := layers[1].(*testbench.IPv4) - if !ok { - return 0, fmt.Errorf("got network layer: %T, expected: *IPv4", layers[1]) - } - if *ipv4.Flags&header.IPv4FlagDontFragment != 0 { - return 0, fmt.Errorf("got IPv4 DF=1, expected DF=0") - } - return *ipv4.ID, nil -} - -// RFC 6864 section 4.2 states: "The IPv4 ID of non-atomic datagrams MUST NOT -// be reused when sending a copy of an earlier non-atomic datagram." -// -// This test creates a TCP connection, uses the IP_MTU_DISCOVER socket option -// to force the DF bit to be 0, and checks that a retransmitted segment has a -// different IPv4 Identification value than the original segment. -func TestIPv4RetransmitIdentificationUniqueness(t *testing.T) { - for _, tc := range []struct { - name string - payload []byte - }{ - {"SmallPayload", []byte("sample data")}, - // 512 bytes is chosen because sending more than this in a single segment - // causes the retransmission to send less than the original amount. - {"512BytePayload", testbench.GenerateRandomPayload(t, 512)}, - } { - t.Run(tc.name, func(t *testing.T) { - dut := testbench.NewDUT(t) - defer dut.TearDown() - - listenFD, remotePort := dut.CreateListener(unix.SOCK_STREAM, unix.IPPROTO_TCP, 1) - defer dut.Close(listenFD) - - conn := testbench.NewTCPIPv4(t, testbench.TCP{DstPort: &remotePort}, testbench.TCP{SrcPort: &remotePort}) - defer conn.Close() - - conn.Connect() - remoteFD, _ := dut.Accept(listenFD) - defer dut.Close(remoteFD) - - dut.SetSockOptInt(remoteFD, unix.IPPROTO_TCP, unix.TCP_NODELAY, 1) - - // TODO(b/129291778) The following socket option clears the DF bit on - // IP packets sent over the socket, and is currently not supported by - // gVisor. gVisor by default sends packets with DF=0 anyway, so the - // socket option being not supported does not affect the operation of - // this test. Once the socket option is supported, the following call - // can be changed to simply assert success. - ret, errno := dut.SetSockOptIntWithErrno(context.Background(), remoteFD, unix.IPPROTO_IP, linux.IP_MTU_DISCOVER, linux.IP_PMTUDISC_DONT) - if ret == -1 && errno != unix.ENOTSUP { - t.Fatalf("failed to set IP_MTU_DISCOVER socket option to IP_PMTUDISC_DONT: %s", errno) - } - - samplePayload := &testbench.Payload{Bytes: tc.payload} - - dut.Send(remoteFD, tc.payload, 0) - if _, err := conn.ExpectData(&testbench.TCP{}, samplePayload, time.Second); err != nil { - t.Fatalf("failed to receive TCP segment sent for RTT calculation: %s", err) - } - // Let the DUT estimate RTO with RTT from the DATA-ACK. - // TODO(gvisor.dev/issue/2685) Estimate RTO during handshake, after which - // we can skip sending this ACK. - conn.Send(testbench.TCP{Flags: testbench.Uint8(header.TCPFlagAck)}) - - dut.Send(remoteFD, tc.payload, 0) - expectTCP := &testbench.TCP{SeqNum: testbench.Uint32(uint32(*conn.RemoteSeqNum()))} - originalID, err := recvTCPSegment(&conn, expectTCP, samplePayload) - if err != nil { - t.Fatalf("failed to receive TCP segment: %s", err) - } - - retransmitID, err := recvTCPSegment(&conn, expectTCP, samplePayload) - if err != nil { - t.Fatalf("failed to receive retransmitted TCP segment: %s", err) - } - if originalID == retransmitID { - t.Fatalf("unexpectedly got retransmitted TCP segment with same IPv4 ID field=%d", originalID) - } - }) - } -} diff --git a/test/packetimpact/tests/ipv6_unknown_options_action_test.go b/test/packetimpact/tests/ipv6_unknown_options_action_test.go deleted file mode 100644 index d301d8829..000000000 --- a/test/packetimpact/tests/ipv6_unknown_options_action_test.go +++ /dev/null @@ -1,187 +0,0 @@ -// Copyright 2020 The gVisor Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// http://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -package ipv6_unknown_options_action_test - -import ( - "encoding/binary" - "flag" - "net" - "testing" - "time" - - "gvisor.dev/gvisor/pkg/tcpip" - "gvisor.dev/gvisor/pkg/tcpip/header" - tb "gvisor.dev/gvisor/test/packetimpact/testbench" -) - -func init() { - tb.RegisterFlags(flag.CommandLine) -} - -func mkHopByHopOptionsExtHdr(optType byte) tb.Layer { - return &tb.IPv6HopByHopOptionsExtHdr{ - Options: []byte{optType, 0x04, 0x00, 0x00, 0x00, 0x00}, - } -} - -func mkDestinationOptionsExtHdr(optType byte) tb.Layer { - return &tb.IPv6DestinationOptionsExtHdr{ - Options: []byte{optType, 0x04, 0x00, 0x00, 0x00, 0x00}, - } -} - -func optionTypeFromAction(action header.IPv6OptionUnknownAction) byte { - return byte(action << 6) -} - -func TestIPv6UnknownOptionAction(t *testing.T) { - for _, tt := range []struct { - description string - mkExtHdr func(optType byte) tb.Layer - action header.IPv6OptionUnknownAction - multicastDst bool - wantICMPv6 bool - }{ - { - description: "0b00/hbh", - mkExtHdr: mkHopByHopOptionsExtHdr, - action: header.IPv6OptionUnknownActionSkip, - multicastDst: false, - wantICMPv6: false, - }, - { - description: "0b01/hbh", - mkExtHdr: mkHopByHopOptionsExtHdr, - action: header.IPv6OptionUnknownActionDiscard, - multicastDst: false, - wantICMPv6: false, - }, - { - description: "0b10/hbh/unicast", - mkExtHdr: mkHopByHopOptionsExtHdr, - action: header.IPv6OptionUnknownActionDiscardSendICMP, - multicastDst: false, - wantICMPv6: true, - }, - { - description: "0b10/hbh/multicast", - mkExtHdr: mkHopByHopOptionsExtHdr, - action: header.IPv6OptionUnknownActionDiscardSendICMP, - multicastDst: true, - wantICMPv6: true, - }, - { - description: "0b11/hbh/unicast", - mkExtHdr: mkHopByHopOptionsExtHdr, - action: header.IPv6OptionUnknownActionDiscardSendICMPNoMulticastDest, - multicastDst: false, - wantICMPv6: true, - }, - { - description: "0b11/hbh/multicast", - mkExtHdr: mkHopByHopOptionsExtHdr, - action: header.IPv6OptionUnknownActionDiscardSendICMPNoMulticastDest, - multicastDst: true, - wantICMPv6: false, - }, - { - description: "0b00/destination", - mkExtHdr: mkDestinationOptionsExtHdr, - action: header.IPv6OptionUnknownActionSkip, - multicastDst: false, - wantICMPv6: false, - }, - { - description: "0b01/destination", - mkExtHdr: mkDestinationOptionsExtHdr, - action: header.IPv6OptionUnknownActionDiscard, - multicastDst: false, - wantICMPv6: false, - }, - { - description: "0b10/destination/unicast", - mkExtHdr: mkDestinationOptionsExtHdr, - action: header.IPv6OptionUnknownActionDiscardSendICMP, - multicastDst: false, - wantICMPv6: true, - }, - { - description: "0b10/destination/multicast", - mkExtHdr: mkDestinationOptionsExtHdr, - action: header.IPv6OptionUnknownActionDiscardSendICMP, - multicastDst: true, - wantICMPv6: true, - }, - { - description: "0b11/destination/unicast", - mkExtHdr: mkDestinationOptionsExtHdr, - action: header.IPv6OptionUnknownActionDiscardSendICMPNoMulticastDest, - multicastDst: false, - wantICMPv6: true, - }, - { - description: "0b11/destination/multicast", - mkExtHdr: mkDestinationOptionsExtHdr, - action: header.IPv6OptionUnknownActionDiscardSendICMPNoMulticastDest, - multicastDst: true, - wantICMPv6: false, - }, - } { - t.Run(tt.description, func(t *testing.T) { - dut := tb.NewDUT(t) - defer dut.TearDown() - ipv6Conn := tb.NewIPv6Conn(t, tb.IPv6{}, tb.IPv6{}) - conn := (*tb.Connection)(&ipv6Conn) - defer ipv6Conn.Close() - - outgoingOverride := tb.Layers{} - if tt.multicastDst { - outgoingOverride = tb.Layers{&tb.IPv6{ - DstAddr: tb.Address(tcpip.Address(net.ParseIP("ff02::1"))), - }} - } - - outgoing := conn.CreateFrame(outgoingOverride, tt.mkExtHdr(optionTypeFromAction(tt.action))) - conn.SendFrame(outgoing) - ipv6Sent := outgoing[1:] - invokingPacket, err := ipv6Sent.ToBytes() - if err != nil { - t.Fatalf("failed to serialize the outgoing packet: %s", err) - } - icmpv6Payload := make([]byte, 4) - // The pointer in the ICMPv6 parameter problem message should point to - // the option type of the unknown option. In our test case, it is the - // first option in the extension header whose option type is 2 bytes - // after the IPv6 header (after NextHeader and ExtHdrLen). - binary.BigEndian.PutUint32(icmpv6Payload, header.IPv6MinimumSize+2) - icmpv6Payload = append(icmpv6Payload, invokingPacket...) - gotICMPv6, err := ipv6Conn.ExpectFrame(tb.Layers{ - &tb.Ether{}, - &tb.IPv6{}, - &tb.ICMPv6{ - Type: tb.ICMPv6Type(header.ICMPv6ParamProblem), - Code: tb.Byte(2), - NDPPayload: icmpv6Payload, - }, - }, time.Second) - if tt.wantICMPv6 && err != nil { - t.Fatalf("expected ICMPv6 Parameter Problem but got none: %s", err) - } - if !tt.wantICMPv6 && gotICMPv6 != nil { - t.Fatalf("expected no ICMPv6 Parameter Problem but got one: %s", gotICMPv6) - } - }) - } -} diff --git a/test/packetimpact/tests/tcp_close_wait_ack_test.go b/test/packetimpact/tests/tcp_close_wait_ack_test.go deleted file mode 100644 index 6e7ff41d7..000000000 --- a/test/packetimpact/tests/tcp_close_wait_ack_test.go +++ /dev/null @@ -1,108 +0,0 @@ -// Copyright 2020 The gVisor Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// http://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -package tcp_close_wait_ack_test - -import ( - "flag" - "fmt" - "testing" - "time" - - "golang.org/x/sys/unix" - "gvisor.dev/gvisor/pkg/tcpip/header" - "gvisor.dev/gvisor/pkg/tcpip/seqnum" - "gvisor.dev/gvisor/test/packetimpact/testbench" -) - -func init() { - testbench.RegisterFlags(flag.CommandLine) -} - -func TestCloseWaitAck(t *testing.T) { - for _, tt := range []struct { - description string - makeTestingTCP func(conn *testbench.TCPIPv4, seqNumOffset seqnum.Size, windowSize seqnum.Size) testbench.TCP - seqNumOffset seqnum.Size - expectAck bool - }{ - {"OTW", GenerateOTWSeqSegment, 0, false}, - {"OTW", GenerateOTWSeqSegment, 1, true}, - {"OTW", GenerateOTWSeqSegment, 2, true}, - {"ACK", GenerateUnaccACKSegment, 0, false}, - {"ACK", GenerateUnaccACKSegment, 1, true}, - {"ACK", GenerateUnaccACKSegment, 2, true}, - } { - t.Run(fmt.Sprintf("%s%d", tt.description, tt.seqNumOffset), func(t *testing.T) { - dut := testbench.NewDUT(t) - defer dut.TearDown() - listenFd, remotePort := dut.CreateListener(unix.SOCK_STREAM, unix.IPPROTO_TCP, 1) - defer dut.Close(listenFd) - conn := testbench.NewTCPIPv4(t, testbench.TCP{DstPort: &remotePort}, testbench.TCP{SrcPort: &remotePort}) - defer conn.Close() - - conn.Connect() - acceptFd, _ := dut.Accept(listenFd) - - // Send a FIN to DUT to intiate the active close - conn.Send(testbench.TCP{Flags: testbench.Uint8(header.TCPFlagAck | header.TCPFlagFin)}) - gotTCP, err := conn.Expect(testbench.TCP{Flags: testbench.Uint8(header.TCPFlagAck)}, time.Second) - if err != nil { - t.Fatalf("expected an ACK for our fin and DUT should enter CLOSE_WAIT: %s", err) - } - windowSize := seqnum.Size(*gotTCP.WindowSize) - - // Send a segment with OTW Seq / unacc ACK and expect an ACK back - conn.Send(tt.makeTestingTCP(&conn, tt.seqNumOffset, windowSize), &testbench.Payload{Bytes: []byte("Sample Data")}) - gotAck, err := conn.Expect(testbench.TCP{Flags: testbench.Uint8(header.TCPFlagAck)}, time.Second) - if tt.expectAck && err != nil { - t.Fatalf("expected an ack but got none: %s", err) - } - if !tt.expectAck && gotAck != nil { - t.Fatalf("expected no ack but got one: %s", gotAck) - } - - // Now let's verify DUT is indeed in CLOSE_WAIT - dut.Close(acceptFd) - if _, err := conn.Expect(testbench.TCP{Flags: testbench.Uint8(header.TCPFlagAck | header.TCPFlagFin)}, time.Second); err != nil { - t.Fatalf("expected DUT to send a FIN: %s", err) - } - // Ack the FIN from DUT - conn.Send(testbench.TCP{Flags: testbench.Uint8(header.TCPFlagAck)}) - // Send some extra data to DUT - conn.Send(testbench.TCP{Flags: testbench.Uint8(header.TCPFlagAck)}, &testbench.Payload{Bytes: []byte("Sample Data")}) - if _, err := conn.Expect(testbench.TCP{Flags: testbench.Uint8(header.TCPFlagRst)}, time.Second); err != nil { - t.Fatalf("expected DUT to send an RST: %s", err) - } - }) - } -} - -// This generates an segment with seqnum = RCV.NXT + RCV.WND + seqNumOffset, the -// generated segment is only acceptable when seqNumOffset is 0, otherwise an ACK -// is expected from the receiver. -func GenerateOTWSeqSegment(conn *testbench.TCPIPv4, seqNumOffset seqnum.Size, windowSize seqnum.Size) testbench.TCP { - lastAcceptable := conn.LocalSeqNum().Add(windowSize) - otwSeq := uint32(lastAcceptable.Add(seqNumOffset)) - return testbench.TCP{SeqNum: testbench.Uint32(otwSeq), Flags: testbench.Uint8(header.TCPFlagAck)} -} - -// This generates an segment with acknum = SND.NXT + seqNumOffset, the generated -// segment is only acceptable when seqNumOffset is 0, otherwise an ACK is -// expected from the receiver. -func GenerateUnaccACKSegment(conn *testbench.TCPIPv4, seqNumOffset seqnum.Size, windowSize seqnum.Size) testbench.TCP { - lastAcceptable := conn.RemoteSeqNum() - unaccAck := uint32(lastAcceptable.Add(seqNumOffset)) - return testbench.TCP{AckNum: testbench.Uint32(unaccAck), Flags: testbench.Uint8(header.TCPFlagAck)} -} diff --git a/test/packetimpact/tests/tcp_cork_mss_test.go b/test/packetimpact/tests/tcp_cork_mss_test.go deleted file mode 100644 index fb8f48629..000000000 --- a/test/packetimpact/tests/tcp_cork_mss_test.go +++ /dev/null @@ -1,84 +0,0 @@ -// Copyright 2020 The gVisor Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// http://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -package tcp_cork_mss_test - -import ( - "flag" - "testing" - "time" - - "golang.org/x/sys/unix" - "gvisor.dev/gvisor/pkg/tcpip/header" - "gvisor.dev/gvisor/test/packetimpact/testbench" -) - -func init() { - testbench.RegisterFlags(flag.CommandLine) -} - -// TestTCPCorkMSS tests for segment coalesce and split as per MSS. -func TestTCPCorkMSS(t *testing.T) { - dut := testbench.NewDUT(t) - defer dut.TearDown() - listenFD, remotePort := dut.CreateListener(unix.SOCK_STREAM, unix.IPPROTO_TCP, 1) - defer dut.Close(listenFD) - conn := testbench.NewTCPIPv4(t, testbench.TCP{DstPort: &remotePort}, testbench.TCP{SrcPort: &remotePort}) - defer conn.Close() - - const mss = uint32(header.TCPDefaultMSS) - options := make([]byte, header.TCPOptionMSSLength) - header.EncodeMSSOption(mss, options) - conn.ConnectWithOptions(options) - - acceptFD, _ := dut.Accept(listenFD) - defer dut.Close(acceptFD) - - dut.SetSockOptInt(acceptFD, unix.IPPROTO_TCP, unix.TCP_CORK, 1) - - // Let the dut application send 2 small segments to be held up and coalesced - // until the application sends a larger segment to fill up to > MSS. - sampleData := []byte("Sample Data") - dut.Send(acceptFD, sampleData, 0) - dut.Send(acceptFD, sampleData, 0) - - expectedData := sampleData - expectedData = append(expectedData, sampleData...) - largeData := make([]byte, mss+1) - expectedData = append(expectedData, largeData...) - dut.Send(acceptFD, largeData, 0) - - // Expect the segments to be coalesced and sent and capped to MSS. - expectedPayload := testbench.Payload{Bytes: expectedData[:mss]} - if _, err := conn.ExpectData(&testbench.TCP{Flags: testbench.Uint8(header.TCPFlagAck)}, &expectedPayload, time.Second); err != nil { - t.Fatalf("expected payload was not received: %s", err) - } - conn.Send(testbench.TCP{Flags: testbench.Uint8(header.TCPFlagAck)}) - // Expect the coalesced segment to be split and transmitted. - expectedPayload = testbench.Payload{Bytes: expectedData[mss:]} - if _, err := conn.ExpectData(&testbench.TCP{Flags: testbench.Uint8(header.TCPFlagAck | header.TCPFlagPsh)}, &expectedPayload, time.Second); err != nil { - t.Fatalf("expected payload was not received: %s", err) - } - - // Check for segments to *not* be held up because of TCP_CORK when - // the current send window is less than MSS. - conn.Send(testbench.TCP{Flags: testbench.Uint8(header.TCPFlagAck), WindowSize: testbench.Uint16(uint16(2 * len(sampleData)))}) - dut.Send(acceptFD, sampleData, 0) - dut.Send(acceptFD, sampleData, 0) - expectedPayload = testbench.Payload{Bytes: append(sampleData, sampleData...)} - if _, err := conn.ExpectData(&testbench.TCP{Flags: testbench.Uint8(header.TCPFlagAck | header.TCPFlagPsh)}, &expectedPayload, time.Second); err != nil { - t.Fatalf("expected payload was not received: %s", err) - } - conn.Send(testbench.TCP{Flags: testbench.Uint8(header.TCPFlagAck)}) -} diff --git a/test/packetimpact/tests/tcp_handshake_window_size_test.go b/test/packetimpact/tests/tcp_handshake_window_size_test.go deleted file mode 100644 index 652b530d0..000000000 --- a/test/packetimpact/tests/tcp_handshake_window_size_test.go +++ /dev/null @@ -1,66 +0,0 @@ -// Copyright 2020 The gVisor Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// http://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -package tcp_handshake_window_size_test - -import ( - "flag" - "testing" - "time" - - "golang.org/x/sys/unix" - "gvisor.dev/gvisor/pkg/tcpip/header" - "gvisor.dev/gvisor/test/packetimpact/testbench" -) - -func init() { - testbench.RegisterFlags(flag.CommandLine) -} - -// TestTCPHandshakeWindowSize tests if the stack is honoring the window size -// communicated during handshake. -func TestTCPHandshakeWindowSize(t *testing.T) { - dut := testbench.NewDUT(t) - defer dut.TearDown() - listenFD, remotePort := dut.CreateListener(unix.SOCK_STREAM, unix.IPPROTO_TCP, 1) - defer dut.Close(listenFD) - conn := testbench.NewTCPIPv4(t, testbench.TCP{DstPort: &remotePort}, testbench.TCP{SrcPort: &remotePort}) - defer conn.Close() - - // Start handshake with zero window size. - conn.Send(testbench.TCP{Flags: testbench.Uint8(header.TCPFlagSyn), WindowSize: testbench.Uint16(uint16(0))}) - if _, err := conn.ExpectData(&testbench.TCP{Flags: testbench.Uint8(header.TCPFlagSyn | header.TCPFlagAck)}, nil, time.Second); err != nil { - t.Fatalf("expected SYN-ACK: %s", err) - } - // Update the advertised window size to a non-zero value with the ACK that - // completes the handshake. - // - // Set the window size with MSB set and expect the dut to treat it as - // an unsigned value. - conn.Send(testbench.TCP{Flags: testbench.Uint8(header.TCPFlagAck), WindowSize: testbench.Uint16(uint16(1 << 15))}) - - acceptFd, _ := dut.Accept(listenFD) - defer dut.Close(acceptFd) - - sampleData := []byte("Sample Data") - samplePayload := &testbench.Payload{Bytes: sampleData} - - // Since we advertised a zero window followed by a non-zero window, - // expect the dut to honor the recently advertised non-zero window - // and actually send out the data instead of probing for zero window. - dut.Send(acceptFd, sampleData, 0) - if _, err := conn.ExpectNextData(&testbench.TCP{Flags: testbench.Uint8(header.TCPFlagAck | header.TCPFlagPsh)}, samplePayload, time.Second); err != nil { - t.Fatalf("expected payload was not received: %s", err) - } -} diff --git a/test/packetimpact/tests/tcp_noaccept_close_rst_test.go b/test/packetimpact/tests/tcp_noaccept_close_rst_test.go deleted file mode 100644 index b9b3e91d3..000000000 --- a/test/packetimpact/tests/tcp_noaccept_close_rst_test.go +++ /dev/null @@ -1,42 +0,0 @@ -// Copyright 2020 The gVisor Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// http://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -package tcp_noaccept_close_rst_test - -import ( - "flag" - "testing" - "time" - - "golang.org/x/sys/unix" - "gvisor.dev/gvisor/pkg/tcpip/header" - "gvisor.dev/gvisor/test/packetimpact/testbench" -) - -func init() { - testbench.RegisterFlags(flag.CommandLine) -} - -func TestTcpNoAcceptCloseReset(t *testing.T) { - dut := testbench.NewDUT(t) - defer dut.TearDown() - listenFd, remotePort := dut.CreateListener(unix.SOCK_STREAM, unix.IPPROTO_TCP, 1) - conn := testbench.NewTCPIPv4(t, testbench.TCP{DstPort: &remotePort}, testbench.TCP{SrcPort: &remotePort}) - conn.Connect() - defer conn.Close() - dut.Close(listenFd) - if _, err := conn.Expect(testbench.TCP{Flags: testbench.Uint8(header.TCPFlagRst | header.TCPFlagAck)}, 1*time.Second); err != nil { - t.Fatalf("expected a RST-ACK packet but got none: %s", err) - } -} diff --git a/test/packetimpact/tests/tcp_outside_the_window_test.go b/test/packetimpact/tests/tcp_outside_the_window_test.go deleted file mode 100644 index ad8c74234..000000000 --- a/test/packetimpact/tests/tcp_outside_the_window_test.go +++ /dev/null @@ -1,93 +0,0 @@ -// Copyright 2020 The gVisor Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// http://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -package tcp_outside_the_window_test - -import ( - "flag" - "fmt" - "testing" - "time" - - "golang.org/x/sys/unix" - "gvisor.dev/gvisor/pkg/tcpip/header" - "gvisor.dev/gvisor/pkg/tcpip/seqnum" - "gvisor.dev/gvisor/test/packetimpact/testbench" -) - -func init() { - testbench.RegisterFlags(flag.CommandLine) -} - -// TestTCPOutsideTheWindows tests the behavior of the DUT when packets arrive -// that are inside or outside the TCP window. Packets that are outside the -// window should force an extra ACK, as described in RFC793 page 69: -// https://tools.ietf.org/html/rfc793#page-69 -func TestTCPOutsideTheWindow(t *testing.T) { - for _, tt := range []struct { - description string - tcpFlags uint8 - payload []testbench.Layer - seqNumOffset seqnum.Size - expectACK bool - }{ - {"SYN", header.TCPFlagSyn, nil, 0, true}, - {"SYNACK", header.TCPFlagSyn | header.TCPFlagAck, nil, 0, true}, - {"ACK", header.TCPFlagAck, nil, 0, false}, - {"FIN", header.TCPFlagFin, nil, 0, false}, - {"Data", header.TCPFlagAck, []testbench.Layer{&testbench.Payload{Bytes: []byte("abc123")}}, 0, true}, - - {"SYN", header.TCPFlagSyn, nil, 1, true}, - {"SYNACK", header.TCPFlagSyn | header.TCPFlagAck, nil, 1, true}, - {"ACK", header.TCPFlagAck, nil, 1, true}, - {"FIN", header.TCPFlagFin, nil, 1, false}, - {"Data", header.TCPFlagAck, []testbench.Layer{&testbench.Payload{Bytes: []byte("abc123")}}, 1, true}, - - {"SYN", header.TCPFlagSyn, nil, 2, true}, - {"SYNACK", header.TCPFlagSyn | header.TCPFlagAck, nil, 2, true}, - {"ACK", header.TCPFlagAck, nil, 2, true}, - {"FIN", header.TCPFlagFin, nil, 2, false}, - {"Data", header.TCPFlagAck, []testbench.Layer{&testbench.Payload{Bytes: []byte("abc123")}}, 2, true}, - } { - t.Run(fmt.Sprintf("%s%d", tt.description, tt.seqNumOffset), func(t *testing.T) { - dut := testbench.NewDUT(t) - defer dut.TearDown() - listenFD, remotePort := dut.CreateListener(unix.SOCK_STREAM, unix.IPPROTO_TCP, 1) - defer dut.Close(listenFD) - conn := testbench.NewTCPIPv4(t, testbench.TCP{DstPort: &remotePort}, testbench.TCP{SrcPort: &remotePort}) - defer conn.Close() - conn.Connect() - acceptFD, _ := dut.Accept(listenFD) - defer dut.Close(acceptFD) - - windowSize := seqnum.Size(*conn.SynAck().WindowSize) + tt.seqNumOffset - conn.Drain() - // Ignore whatever incrementing that this out-of-order packet might cause - // to the AckNum. - localSeqNum := testbench.Uint32(uint32(*conn.LocalSeqNum())) - conn.Send(testbench.TCP{ - Flags: testbench.Uint8(tt.tcpFlags), - SeqNum: testbench.Uint32(uint32(conn.LocalSeqNum().Add(windowSize))), - }, tt.payload...) - timeout := 3 * time.Second - gotACK, err := conn.Expect(testbench.TCP{Flags: testbench.Uint8(header.TCPFlagAck), AckNum: localSeqNum}, timeout) - if tt.expectACK && err != nil { - t.Fatalf("expected an ACK packet within %s but got none: %s", timeout, err) - } - if !tt.expectACK && gotACK != nil { - t.Fatalf("expected no ACK packet within %s but got one: %s", timeout, gotACK) - } - }) - } -} diff --git a/test/packetimpact/tests/tcp_paws_mechanism_test.go b/test/packetimpact/tests/tcp_paws_mechanism_test.go deleted file mode 100644 index 55db4ece6..000000000 --- a/test/packetimpact/tests/tcp_paws_mechanism_test.go +++ /dev/null @@ -1,109 +0,0 @@ -// Copyright 2020 The gVisor Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// http://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -package tcp_paws_mechanism_test - -import ( - "encoding/hex" - "flag" - "testing" - "time" - - "golang.org/x/sys/unix" - "gvisor.dev/gvisor/pkg/tcpip/header" - "gvisor.dev/gvisor/test/packetimpact/testbench" -) - -func init() { - testbench.RegisterFlags(flag.CommandLine) -} - -func TestPAWSMechanism(t *testing.T) { - dut := testbench.NewDUT(t) - defer dut.TearDown() - listenFD, remotePort := dut.CreateListener(unix.SOCK_STREAM, unix.IPPROTO_TCP, 1) - defer dut.Close(listenFD) - conn := testbench.NewTCPIPv4(t, testbench.TCP{DstPort: &remotePort}, testbench.TCP{SrcPort: &remotePort}) - defer conn.Close() - - options := make([]byte, header.TCPOptionTSLength) - header.EncodeTSOption(currentTS(), 0, options) - conn.Send(testbench.TCP{Flags: testbench.Uint8(header.TCPFlagSyn), Options: options}) - synAck, err := conn.Expect(testbench.TCP{Flags: testbench.Uint8(header.TCPFlagSyn | header.TCPFlagAck)}, time.Second) - if err != nil { - t.Fatalf("didn't get synack during handshake: %s", err) - } - parsedSynOpts := header.ParseSynOptions(synAck.Options, true) - if !parsedSynOpts.TS { - t.Fatalf("expected TSOpt from DUT, options we got:\n%s", hex.Dump(synAck.Options)) - } - tsecr := parsedSynOpts.TSVal - header.EncodeTSOption(currentTS(), tsecr, options) - conn.Send(testbench.TCP{Flags: testbench.Uint8(header.TCPFlagAck), Options: options}) - acceptFD, _ := dut.Accept(listenFD) - defer dut.Close(acceptFD) - - sampleData := []byte("Sample Data") - sentTSVal := currentTS() - header.EncodeTSOption(sentTSVal, tsecr, options) - // 3ms here is chosen arbitrarily to make sure we have increasing timestamps - // every time we send one, it should not cause any flakiness because timestamps - // only need to be non-decreasing. - time.Sleep(3 * time.Millisecond) - conn.Send(testbench.TCP{Flags: testbench.Uint8(header.TCPFlagAck), Options: options}, &testbench.Payload{Bytes: sampleData}) - - gotTCP, err := conn.Expect(testbench.TCP{Flags: testbench.Uint8(header.TCPFlagAck)}, time.Second) - if err != nil { - t.Fatalf("expected an ACK but got none: %s", err) - } - - parsedOpts := header.ParseTCPOptions(gotTCP.Options) - if !parsedOpts.TS { - t.Fatalf("expected TS option in response, options we got:\n%s", hex.Dump(gotTCP.Options)) - } - if parsedOpts.TSVal < tsecr { - t.Fatalf("TSVal should be non-decreasing, but %d < %d", parsedOpts.TSVal, tsecr) - } - if parsedOpts.TSEcr != sentTSVal { - t.Fatalf("TSEcr should match our sent TSVal, %d != %d", parsedOpts.TSEcr, sentTSVal) - } - tsecr = parsedOpts.TSVal - lastAckNum := gotTCP.AckNum - - badTSVal := sentTSVal - 100 - header.EncodeTSOption(badTSVal, tsecr, options) - // 3ms here is chosen arbitrarily and this time.Sleep() should not cause flakiness - // due to the exact same reasoning discussed above. - time.Sleep(3 * time.Millisecond) - conn.Send(testbench.TCP{Flags: testbench.Uint8(header.TCPFlagAck), Options: options}, &testbench.Payload{Bytes: sampleData}) - - gotTCP, err = conn.Expect(testbench.TCP{AckNum: lastAckNum, Flags: testbench.Uint8(header.TCPFlagAck)}, time.Second) - if err != nil { - t.Fatalf("expected segment with AckNum %d but got none: %s", lastAckNum, err) - } - parsedOpts = header.ParseTCPOptions(gotTCP.Options) - if !parsedOpts.TS { - t.Fatalf("expected TS option in response, options we got:\n%s", hex.Dump(gotTCP.Options)) - } - if parsedOpts.TSVal < tsecr { - t.Fatalf("TSVal should be non-decreasing, but %d < %d", parsedOpts.TSVal, tsecr) - } - if parsedOpts.TSEcr != sentTSVal { - t.Fatalf("TSEcr should match our sent TSVal, %d != %d", parsedOpts.TSEcr, sentTSVal) - } -} - -func currentTS() uint32 { - return uint32(time.Now().UnixNano() / 1e6) -} diff --git a/test/packetimpact/tests/tcp_queue_receive_in_syn_sent_test.go b/test/packetimpact/tests/tcp_queue_receive_in_syn_sent_test.go deleted file mode 100644 index 8fbec893b..000000000 --- a/test/packetimpact/tests/tcp_queue_receive_in_syn_sent_test.go +++ /dev/null @@ -1,132 +0,0 @@ -// Copyright 2020 The gVisor Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// http://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -package tcp_queue_receive_in_syn_sent_test - -import ( - "bytes" - "context" - "encoding/hex" - "errors" - "flag" - "net" - "sync" - "syscall" - "testing" - "time" - - "golang.org/x/sys/unix" - "gvisor.dev/gvisor/pkg/tcpip/header" - "gvisor.dev/gvisor/test/packetimpact/testbench" -) - -func init() { - testbench.RegisterFlags(flag.CommandLine) -} - -// TestQueueReceiveInSynSent tests receive behavior when the TCP state -// is SYN-SENT. -// It tests for 2 variants where the receive is blocked and: -// (1) we complete handshake and send sample data. -// (2) we send a TCP RST. -func TestQueueReceiveInSynSent(t *testing.T) { - for _, tt := range []struct { - description string - reset bool - }{ - {description: "Send DATA", reset: false}, - {description: "Send RST", reset: true}, - } { - t.Run(tt.description, func(t *testing.T) { - dut := testbench.NewDUT(t) - defer dut.TearDown() - - socket, remotePort := dut.CreateBoundSocket(unix.SOCK_STREAM, unix.IPPROTO_TCP, net.ParseIP(testbench.RemoteIPv4)) - conn := testbench.NewTCPIPv4(t, testbench.TCP{DstPort: &remotePort}, testbench.TCP{SrcPort: &remotePort}) - defer conn.Close() - - sampleData := []byte("Sample Data") - - dut.SetNonBlocking(socket, true) - if _, err := dut.ConnectWithErrno(context.Background(), socket, conn.LocalAddr()); !errors.Is(err, syscall.EINPROGRESS) { - t.Fatalf("failed to bring DUT to SYN-SENT, got: %s, want EINPROGRESS", err) - } - if _, err := conn.Expect(testbench.TCP{Flags: testbench.Uint8(header.TCPFlagSyn)}, time.Second); err != nil { - t.Fatalf("expected a SYN from DUT, but got none: %s", err) - } - - if _, _, err := dut.RecvWithErrno(context.Background(), socket, int32(len(sampleData)), 0); err != syscall.Errno(unix.EWOULDBLOCK) { - t.Fatalf("expected error %s, got %s", syscall.Errno(unix.EWOULDBLOCK), err) - } - - // Test blocking read. - dut.SetNonBlocking(socket, false) - - var wg sync.WaitGroup - defer wg.Wait() - wg.Add(1) - var block sync.WaitGroup - block.Add(1) - go func() { - defer wg.Done() - ctx, cancel := context.WithTimeout(context.Background(), time.Second*3) - defer cancel() - - block.Done() - // Issue RECEIVE call in SYN-SENT, this should be queued for - // process until the connection is established. - n, buff, err := dut.RecvWithErrno(ctx, socket, int32(len(sampleData)), 0) - if tt.reset { - if err != syscall.Errno(unix.ECONNREFUSED) { - t.Errorf("expected error %s, got %s", syscall.Errno(unix.ECONNREFUSED), err) - } - if n != -1 { - t.Errorf("expected return value %d, got %d", -1, n) - } - return - } - if n == -1 { - t.Errorf("failed to recv on DUT: %s", err) - } - if got := buff[:n]; !bytes.Equal(got, sampleData) { - t.Errorf("received data doesn't match, got:\n%s, want:\n%s", hex.Dump(got), hex.Dump(sampleData)) - } - }() - - // Wait for the goroutine to be scheduled and before it - // blocks on endpoint receive. - block.Wait() - // The following sleep is used to prevent the connection - // from being established before we are blocked on Recv. - time.Sleep(100 * time.Millisecond) - - if tt.reset { - conn.Send(testbench.TCP{Flags: testbench.Uint8(header.TCPFlagRst | header.TCPFlagAck)}) - return - } - - // Bring the connection to Established. - conn.Send(testbench.TCP{Flags: testbench.Uint8(header.TCPFlagSyn | header.TCPFlagAck)}) - if _, err := conn.Expect(testbench.TCP{Flags: testbench.Uint8(header.TCPFlagAck)}, time.Second); err != nil { - t.Fatalf("expected an ACK from DUT, but got none: %s", err) - } - - // Send sample payload and expect an ACK. - conn.Send(testbench.TCP{Flags: testbench.Uint8(header.TCPFlagAck)}, &testbench.Payload{Bytes: sampleData}) - if _, err := conn.Expect(testbench.TCP{Flags: testbench.Uint8(header.TCPFlagAck)}, time.Second); err != nil { - t.Fatalf("expected an ACK from DUT, but got none: %s", err) - } - }) - } -} diff --git a/test/packetimpact/tests/tcp_reordering_test.go b/test/packetimpact/tests/tcp_reordering_test.go deleted file mode 100644 index a5378a9dd..000000000 --- a/test/packetimpact/tests/tcp_reordering_test.go +++ /dev/null @@ -1,174 +0,0 @@ -// Copyright 2020 The gVisor Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// http://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -package reordering_test - -import ( - "flag" - "testing" - "time" - - "golang.org/x/sys/unix" - "gvisor.dev/gvisor/pkg/tcpip/header" - "gvisor.dev/gvisor/pkg/tcpip/seqnum" - tb "gvisor.dev/gvisor/test/packetimpact/testbench" -) - -func init() { - tb.RegisterFlags(flag.CommandLine) -} - -func TestReorderingWindow(t *testing.T) { - dut := tb.NewDUT(t) - defer dut.TearDown() - listenFd, remotePort := dut.CreateListener(unix.SOCK_STREAM, unix.IPPROTO_TCP, 1) - defer dut.Close(listenFd) - conn := tb.NewTCPIPv4(t, tb.TCP{DstPort: &remotePort}, tb.TCP{SrcPort: &remotePort}) - defer conn.Close() - - // Enable SACK. - opts := make([]byte, 40) - optsOff := 0 - optsOff += header.EncodeNOP(opts[optsOff:]) - optsOff += header.EncodeNOP(opts[optsOff:]) - optsOff += header.EncodeSACKPermittedOption(opts[optsOff:]) - - // Ethernet guarantees that the MTU is at least 1500 bytes. - const minMTU = 1500 - const mss = minMTU - header.IPv4MinimumSize - header.TCPMinimumSize - optsOff += header.EncodeMSSOption(mss, opts[optsOff:]) - - conn.ConnectWithOptions(opts[:optsOff]) - - acceptFd, _ := dut.Accept(listenFd) - defer dut.Close(acceptFd) - - if tb.DUTType == "linux" { - // Linux has changed its handling of reordering, force the old behavior. - dut.SetSockOpt(acceptFd, unix.IPPROTO_TCP, unix.TCP_CONGESTION, []byte("reno")) - } - - pls := dut.GetSockOptInt(acceptFd, unix.IPPROTO_TCP, unix.TCP_MAXSEG) - if tb.DUTType == "netstack" { - // netstack does not impliment TCP_MAXSEG correctly. Fake it - // here. Netstack uses the max SACK size which is 32. The MSS - // option is 8 bytes, making the total 36 bytes. - pls = mss - 36 - } - - payload := make([]byte, pls) - - seqNum1 := *conn.RemoteSeqNum() - const numPkts = 10 - // Send some packets, checking that we receive each. - for i, sn := 0, seqNum1; i < numPkts; i++ { - dut.Send(acceptFd, payload, 0) - - gotOne, err := conn.Expect(tb.TCP{SeqNum: tb.Uint32(uint32(sn))}, time.Second) - sn.UpdateForward(seqnum.Size(len(payload))) - if err != nil { - t.Errorf("Expect #%d: %s", i+1, err) - continue - } - if gotOne == nil { - t.Errorf("#%d: expected a packet within a second but got none", i+1) - } - } - - seqNum2 := *conn.RemoteSeqNum() - - // SACK packets #2-4. - sackBlock := make([]byte, 40) - sbOff := 0 - sbOff += header.EncodeNOP(sackBlock[sbOff:]) - sbOff += header.EncodeNOP(sackBlock[sbOff:]) - sbOff += header.EncodeSACKBlocks([]header.SACKBlock{{ - seqNum1.Add(seqnum.Size(len(payload))), - seqNum1.Add(seqnum.Size(4 * len(payload))), - }}, sackBlock[sbOff:]) - conn.Send(tb.TCP{Flags: tb.Uint8(header.TCPFlagAck), AckNum: tb.Uint32(uint32(seqNum1)), Options: sackBlock[:sbOff]}) - - // ACK first packet. - conn.Send(tb.TCP{Flags: tb.Uint8(header.TCPFlagAck), AckNum: tb.Uint32(uint32(seqNum1) + uint32(len(payload)))}) - - // Check for retransmit. - gotOne, err := conn.Expect(tb.TCP{SeqNum: tb.Uint32(uint32(seqNum1))}, time.Second) - if err != nil { - t.Error("Expect for retransmit:", err) - } - if gotOne == nil { - t.Error("expected a retransmitted packet within a second but got none") - } - - // ACK all send packets with a DSACK block for packet #1. This tells - // the other end that we got both the original and retransmit for - // packet #1. - dsackBlock := make([]byte, 40) - dsbOff := 0 - dsbOff += header.EncodeNOP(dsackBlock[dsbOff:]) - dsbOff += header.EncodeNOP(dsackBlock[dsbOff:]) - dsbOff += header.EncodeSACKBlocks([]header.SACKBlock{{ - seqNum1.Add(seqnum.Size(len(payload))), - seqNum1.Add(seqnum.Size(4 * len(payload))), - }}, dsackBlock[dsbOff:]) - - conn.Send(tb.TCP{Flags: tb.Uint8(header.TCPFlagAck), AckNum: tb.Uint32(uint32(seqNum2)), Options: dsackBlock[:dsbOff]}) - - // Send half of the original window of packets, checking that we - // received each. - for i, sn := 0, seqNum2; i < numPkts/2; i++ { - dut.Send(acceptFd, payload, 0) - - gotOne, err := conn.Expect(tb.TCP{SeqNum: tb.Uint32(uint32(sn))}, time.Second) - sn.UpdateForward(seqnum.Size(len(payload))) - if err != nil { - t.Errorf("Expect #%d: %s", i+1, err) - continue - } - if gotOne == nil { - t.Errorf("#%d: expected a packet within a second but got none", i+1) - } - } - - if tb.DUTType == "netstack" { - // The window should now be halved, so we should receive any - // more, even if we send them. - dut.Send(acceptFd, payload, 0) - if got, err := conn.Expect(tb.TCP{}, 100*time.Millisecond); got != nil || err == nil { - t.Fatalf("expected no packets within 100 millisecond, but got one: %s", got) - } - return - } - - // Linux reduces the window by three. Check that we can receive the rest. - for i, sn := 0, seqNum2.Add(seqnum.Size(numPkts/2*len(payload))); i < 2; i++ { - dut.Send(acceptFd, payload, 0) - - gotOne, err := conn.Expect(tb.TCP{SeqNum: tb.Uint32(uint32(sn))}, time.Second) - sn.UpdateForward(seqnum.Size(len(payload))) - if err != nil { - t.Errorf("Expect #%d: %s", i+1, err) - continue - } - if gotOne == nil { - t.Errorf("#%d: expected a packet within a second but got none", i+1) - } - } - - // The window should now be full. - dut.Send(acceptFd, payload, 0) - if got, err := conn.Expect(tb.TCP{}, 100*time.Millisecond); got != nil || err == nil { - t.Fatalf("expected no packets within 100 millisecond, but got one: %s", got) - } -} diff --git a/test/packetimpact/tests/tcp_retransmits_test.go b/test/packetimpact/tests/tcp_retransmits_test.go deleted file mode 100644 index 6940eb7fb..000000000 --- a/test/packetimpact/tests/tcp_retransmits_test.go +++ /dev/null @@ -1,84 +0,0 @@ -// Copyright 2020 The gVisor Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// http://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -package tcp_retransmits_test - -import ( - "flag" - "testing" - "time" - - "golang.org/x/sys/unix" - "gvisor.dev/gvisor/pkg/tcpip/header" - "gvisor.dev/gvisor/test/packetimpact/testbench" -) - -func init() { - testbench.RegisterFlags(flag.CommandLine) -} - -// TestRetransmits tests retransmits occur at exponentially increasing -// time intervals. -func TestRetransmits(t *testing.T) { - dut := testbench.NewDUT(t) - defer dut.TearDown() - listenFd, remotePort := dut.CreateListener(unix.SOCK_STREAM, unix.IPPROTO_TCP, 1) - defer dut.Close(listenFd) - conn := testbench.NewTCPIPv4(t, testbench.TCP{DstPort: &remotePort}, testbench.TCP{SrcPort: &remotePort}) - defer conn.Close() - - conn.Connect() - acceptFd, _ := dut.Accept(listenFd) - defer dut.Close(acceptFd) - - dut.SetSockOptInt(acceptFd, unix.IPPROTO_TCP, unix.TCP_NODELAY, 1) - - sampleData := []byte("Sample Data") - samplePayload := &testbench.Payload{Bytes: sampleData} - - dut.Send(acceptFd, sampleData, 0) - if _, err := conn.ExpectData(&testbench.TCP{}, samplePayload, time.Second); err != nil { - t.Fatalf("expected payload was not received: %s", err) - } - // Give a chance for the dut to estimate RTO with RTT from the DATA-ACK. - // TODO(gvisor.dev/issue/2685) Estimate RTO during handshake, after which - // we can skip sending this ACK. - conn.Send(testbench.TCP{Flags: testbench.Uint8(header.TCPFlagAck)}) - - startRTO := time.Second - current := startRTO - first := time.Now() - dut.Send(acceptFd, sampleData, 0) - seq := testbench.Uint32(uint32(*conn.RemoteSeqNum())) - if _, err := conn.ExpectData(&testbench.TCP{SeqNum: seq}, samplePayload, startRTO); err != nil { - t.Fatalf("expected payload was not received: %s", err) - } - // Expect retransmits of the same segment. - for i := 0; i < 5; i++ { - start := time.Now() - if _, err := conn.ExpectData(&testbench.TCP{SeqNum: seq}, samplePayload, 2*current); err != nil { - t.Fatalf("expected payload was not received: %s loop %d", err, i) - } - if i == 0 { - startRTO = time.Now().Sub(first) - current = 2 * startRTO - continue - } - // Check if the probes came at exponentially increasing intervals. - if p := time.Since(start); p < current-startRTO { - t.Fatalf("retransmit came sooner interval %d probe %d", p, i) - } - current *= 2 - } -} diff --git a/test/packetimpact/tests/tcp_send_window_sizes_piggyback_test.go b/test/packetimpact/tests/tcp_send_window_sizes_piggyback_test.go deleted file mode 100644 index 90ab85419..000000000 --- a/test/packetimpact/tests/tcp_send_window_sizes_piggyback_test.go +++ /dev/null @@ -1,105 +0,0 @@ -// Copyright 2020 The gVisor Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// http://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -package tcp_send_window_sizes_piggyback_test - -import ( - "flag" - "fmt" - "testing" - "time" - - "golang.org/x/sys/unix" - "gvisor.dev/gvisor/pkg/tcpip/header" - "gvisor.dev/gvisor/test/packetimpact/testbench" -) - -func init() { - testbench.RegisterFlags(flag.CommandLine) -} - -// TestSendWindowSizesPiggyback tests cases where segment sizes are close to -// sender window size and checks for ACK piggybacking for each of those case. -func TestSendWindowSizesPiggyback(t *testing.T) { - sampleData := []byte("Sample Data") - segmentSize := uint16(len(sampleData)) - // Advertise receive window sizes that are lesser, equal to or greater than - // enqueued segment size and check for segment transmits. The test attempts - // to enqueue a segment on the dut before acknowledging previous segment and - // lets the dut piggyback any ACKs along with the enqueued segment. - for _, tt := range []struct { - description string - windowSize uint16 - expectedPayload1 []byte - expectedPayload2 []byte - enqueue bool - }{ - // Expect the first segment to be split as it cannot be accomodated in - // the sender window. This means we need not enqueue a new segment after - // the first segment. - {"WindowSmallerThanSegment", segmentSize - 1, sampleData[:(segmentSize - 1)], sampleData[(segmentSize - 1):], false /* enqueue */}, - - {"WindowEqualToSegment", segmentSize, sampleData, sampleData, true /* enqueue */}, - - // Expect the second segment to not be split as its size is greater than - // the available sender window size. The segments should not be split - // when there is pending unacknowledged data and the segment-size is - // greater than available sender window. - {"WindowGreaterThanSegment", segmentSize + 1, sampleData, sampleData, true /* enqueue */}, - } { - t.Run(fmt.Sprintf("%s%d", tt.description, tt.windowSize), func(t *testing.T) { - dut := testbench.NewDUT(t) - defer dut.TearDown() - listenFd, remotePort := dut.CreateListener(unix.SOCK_STREAM, unix.IPPROTO_TCP, 1) - defer dut.Close(listenFd) - - conn := testbench.NewTCPIPv4(t, testbench.TCP{DstPort: &remotePort, WindowSize: testbench.Uint16(tt.windowSize)}, testbench.TCP{SrcPort: &remotePort}) - defer conn.Close() - - conn.Connect() - acceptFd, _ := dut.Accept(listenFd) - defer dut.Close(acceptFd) - - dut.SetSockOptInt(acceptFd, unix.IPPROTO_TCP, unix.TCP_NODELAY, 1) - - expectedTCP := testbench.TCP{Flags: testbench.Uint8(header.TCPFlagAck | header.TCPFlagPsh)} - - dut.Send(acceptFd, sampleData, 0) - expectedPayload := testbench.Payload{Bytes: tt.expectedPayload1} - if _, err := conn.ExpectData(&expectedTCP, &expectedPayload, time.Second); err != nil { - t.Fatalf("expected payload was not received: %s", err) - } - - // Expect any enqueued segment to be transmitted by the dut along with - // piggybacked ACK for our data. - - if tt.enqueue { - // Enqueue a segment for the dut to transmit. - dut.Send(acceptFd, sampleData, 0) - } - - // Send ACK for the previous segment along with data for the dut to - // receive and ACK back. Sending this ACK would make room for the dut - // to transmit any enqueued segment. - conn.Send(testbench.TCP{Flags: testbench.Uint8(header.TCPFlagAck | header.TCPFlagPsh), WindowSize: testbench.Uint16(tt.windowSize)}, &testbench.Payload{Bytes: sampleData}) - - // Expect the dut to piggyback the ACK for received data along with - // the segment enqueued for transmit. - expectedPayload = testbench.Payload{Bytes: tt.expectedPayload2} - if _, err := conn.ExpectData(&expectedTCP, &expectedPayload, time.Second); err != nil { - t.Fatalf("expected payload was not received: %s", err) - } - }) - } -} diff --git a/test/packetimpact/tests/tcp_synrcvd_reset_test.go b/test/packetimpact/tests/tcp_synrcvd_reset_test.go deleted file mode 100644 index 7d5deab01..000000000 --- a/test/packetimpact/tests/tcp_synrcvd_reset_test.go +++ /dev/null @@ -1,52 +0,0 @@ -// Copyright 2020 The gVisor Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// http://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -package tcp_syn_reset_test - -import ( - "flag" - "testing" - "time" - - "golang.org/x/sys/unix" - "gvisor.dev/gvisor/pkg/tcpip/header" - "gvisor.dev/gvisor/test/packetimpact/testbench" -) - -func init() { - testbench.RegisterFlags(flag.CommandLine) -} - -// TestTCPSynRcvdReset tests transition from SYN-RCVD to CLOSED. -func TestTCPSynRcvdReset(t *testing.T) { - dut := testbench.NewDUT(t) - defer dut.TearDown() - listenFD, remotePort := dut.CreateListener(unix.SOCK_STREAM, unix.IPPROTO_TCP, 1) - defer dut.Close(listenFD) - conn := testbench.NewTCPIPv4(t, testbench.TCP{DstPort: &remotePort}, testbench.TCP{SrcPort: &remotePort}) - defer conn.Close() - - // Expect dut connection to have transitioned to SYN-RCVD state. - conn.Send(testbench.TCP{Flags: testbench.Uint8(header.TCPFlagSyn)}) - if _, err := conn.ExpectData(&testbench.TCP{Flags: testbench.Uint8(header.TCPFlagSyn | header.TCPFlagAck)}, nil, time.Second); err != nil { - t.Fatalf("expected SYN-ACK %s", err) - } - conn.Send(testbench.TCP{Flags: testbench.Uint8(header.TCPFlagRst)}) - // Expect the connection to have transitioned SYN-RCVD to CLOSED. - // TODO(gvisor.dev/issue/478): Check for TCP_INFO on the dut side. - conn.Send(testbench.TCP{Flags: testbench.Uint8(header.TCPFlagAck)}) - if _, err := conn.ExpectData(&testbench.TCP{Flags: testbench.Uint8(header.TCPFlagRst)}, nil, time.Second); err != nil { - t.Fatalf("expected a TCP RST %s", err) - } -} diff --git a/test/packetimpact/tests/tcp_synsent_reset_test.go b/test/packetimpact/tests/tcp_synsent_reset_test.go deleted file mode 100644 index 6898a2239..000000000 --- a/test/packetimpact/tests/tcp_synsent_reset_test.go +++ /dev/null @@ -1,88 +0,0 @@ -// Copyright 2020 The gVisor Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// http://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -package tcp_synsent_reset_test - -import ( - "flag" - "net" - "testing" - "time" - - "golang.org/x/sys/unix" - "gvisor.dev/gvisor/pkg/tcpip/header" - tb "gvisor.dev/gvisor/test/packetimpact/testbench" -) - -func init() { - tb.RegisterFlags(flag.CommandLine) -} - -// dutSynSentState sets up the dut connection in SYN-SENT state. -func dutSynSentState(t *testing.T) (*tb.DUT, *tb.TCPIPv4, uint16, uint16) { - dut := tb.NewDUT(t) - - clientFD, clientPort := dut.CreateBoundSocket(unix.SOCK_STREAM|unix.SOCK_NONBLOCK, unix.IPPROTO_TCP, net.ParseIP(tb.RemoteIPv4)) - port := uint16(9001) - conn := tb.NewTCPIPv4(t, tb.TCP{SrcPort: &port, DstPort: &clientPort}, tb.TCP{SrcPort: &clientPort, DstPort: &port}) - - sa := unix.SockaddrInet4{Port: int(port)} - copy(sa.Addr[:], net.IP(net.ParseIP(tb.LocalIPv4)).To4()) - // Bring the dut to SYN-SENT state with a non-blocking connect. - dut.Connect(clientFD, &sa) - if _, err := conn.ExpectData(&tb.TCP{Flags: tb.Uint8(header.TCPFlagSyn)}, nil, time.Second); err != nil { - t.Fatalf("expected SYN\n") - } - - return &dut, &conn, port, clientPort -} - -// TestTCPSynSentReset tests RFC793, p67: SYN-SENT to CLOSED transition. -func TestTCPSynSentReset(t *testing.T) { - dut, conn, _, _ := dutSynSentState(t) - defer conn.Close() - defer dut.TearDown() - conn.Send(tb.TCP{Flags: tb.Uint8(header.TCPFlagRst | header.TCPFlagAck)}) - // Expect the connection to have closed. - // TODO(gvisor.dev/issue/478): Check for TCP_INFO on the dut side. - conn.Send(tb.TCP{Flags: tb.Uint8(header.TCPFlagAck)}) - if _, err := conn.ExpectData(&tb.TCP{Flags: tb.Uint8(header.TCPFlagRst)}, nil, time.Second); err != nil { - t.Fatalf("expected a TCP RST") - } -} - -// TestTCPSynSentRcvdReset tests RFC793, p70, SYN-SENT to SYN-RCVD to CLOSED -// transitions. -func TestTCPSynSentRcvdReset(t *testing.T) { - dut, c, remotePort, clientPort := dutSynSentState(t) - defer dut.TearDown() - defer c.Close() - - conn := tb.NewTCPIPv4(t, tb.TCP{SrcPort: &remotePort, DstPort: &clientPort}, tb.TCP{SrcPort: &clientPort, DstPort: &remotePort}) - defer conn.Close() - // Initiate new SYN connection with the same port pair - // (simultaneous open case), expect the dut connection to move to - // SYN-RCVD state - conn.Send(tb.TCP{Flags: tb.Uint8(header.TCPFlagSyn)}) - if _, err := conn.ExpectData(&tb.TCP{Flags: tb.Uint8(header.TCPFlagSyn | header.TCPFlagAck)}, nil, time.Second); err != nil { - t.Fatalf("expected SYN-ACK %s\n", err) - } - conn.Send(tb.TCP{Flags: tb.Uint8(header.TCPFlagRst)}) - // Expect the connection to have transitioned SYN-RCVD to CLOSED. - // TODO(gvisor.dev/issue/478): Check for TCP_INFO on the dut side. - conn.Send(tb.TCP{Flags: tb.Uint8(header.TCPFlagAck)}) - if _, err := conn.ExpectData(&tb.TCP{Flags: tb.Uint8(header.TCPFlagRst)}, nil, time.Second); err != nil { - t.Fatalf("expected a TCP RST") - } -} diff --git a/test/packetimpact/tests/tcp_user_timeout_test.go b/test/packetimpact/tests/tcp_user_timeout_test.go deleted file mode 100644 index 87e45d765..000000000 --- a/test/packetimpact/tests/tcp_user_timeout_test.go +++ /dev/null @@ -1,105 +0,0 @@ -// Copyright 2020 The gVisor Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// http://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -package tcp_user_timeout_test - -import ( - "flag" - "fmt" - "testing" - "time" - - "golang.org/x/sys/unix" - "gvisor.dev/gvisor/pkg/tcpip/header" - "gvisor.dev/gvisor/test/packetimpact/testbench" -) - -func init() { - testbench.RegisterFlags(flag.CommandLine) -} - -func sendPayload(conn *testbench.TCPIPv4, dut *testbench.DUT, fd int32) error { - sampleData := make([]byte, 100) - for i := range sampleData { - sampleData[i] = uint8(i) - } - conn.Drain() - dut.Send(fd, sampleData, 0) - if _, err := conn.ExpectData(&testbench.TCP{Flags: testbench.Uint8(header.TCPFlagAck | header.TCPFlagPsh)}, &testbench.Payload{Bytes: sampleData}, time.Second); err != nil { - return fmt.Errorf("expected data but got none: %w", err) - } - return nil -} - -func sendFIN(conn *testbench.TCPIPv4, dut *testbench.DUT, fd int32) error { - dut.Close(fd) - return nil -} - -func TestTCPUserTimeout(t *testing.T) { - for _, tt := range []struct { - description string - userTimeout time.Duration - sendDelay time.Duration - }{ - {"NoUserTimeout", 0, 3 * time.Second}, - {"ACKBeforeUserTimeout", 5 * time.Second, 4 * time.Second}, - {"ACKAfterUserTimeout", 5 * time.Second, 7 * time.Second}, - } { - for _, ttf := range []struct { - description string - f func(conn *testbench.TCPIPv4, dut *testbench.DUT, fd int32) error - }{ - {"AfterPayload", sendPayload}, - {"AfterFIN", sendFIN}, - } { - t.Run(tt.description+ttf.description, func(t *testing.T) { - // Create a socket, listen, TCP handshake, and accept. - dut := testbench.NewDUT(t) - defer dut.TearDown() - listenFD, remotePort := dut.CreateListener(unix.SOCK_STREAM, unix.IPPROTO_TCP, 1) - defer dut.Close(listenFD) - conn := testbench.NewTCPIPv4(t, testbench.TCP{DstPort: &remotePort}, testbench.TCP{SrcPort: &remotePort}) - defer conn.Close() - conn.Connect() - acceptFD, _ := dut.Accept(listenFD) - - if tt.userTimeout != 0 { - dut.SetSockOptInt(acceptFD, unix.SOL_TCP, unix.TCP_USER_TIMEOUT, int32(tt.userTimeout.Milliseconds())) - } - - if err := ttf.f(&conn, &dut, acceptFD); err != nil { - t.Fatal(err) - } - - time.Sleep(tt.sendDelay) - conn.Drain() - conn.Send(testbench.TCP{Flags: testbench.Uint8(header.TCPFlagAck)}) - - // If TCP_USER_TIMEOUT was set and the above delay was longer than the - // TCP_USER_TIMEOUT then the DUT should send a RST in response to the - // testbench's packet. - expectRST := tt.userTimeout != 0 && tt.sendDelay > tt.userTimeout - expectTimeout := 5 * time.Second - got, err := conn.Expect(testbench.TCP{Flags: testbench.Uint8(header.TCPFlagRst)}, expectTimeout) - if expectRST && err != nil { - t.Errorf("expected RST packet within %s but got none: %s", expectTimeout, err) - } - if !expectRST && got != nil { - t.Errorf("expected no RST packet within %s but got one: %s", expectTimeout, got) - } - }) - } - } -} diff --git a/test/packetimpact/tests/tcp_window_shrink_test.go b/test/packetimpact/tests/tcp_window_shrink_test.go deleted file mode 100644 index e78d04756..000000000 --- a/test/packetimpact/tests/tcp_window_shrink_test.go +++ /dev/null @@ -1,73 +0,0 @@ -// Copyright 2020 The gVisor Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// http://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -package tcp_window_shrink_test - -import ( - "flag" - "testing" - "time" - - "golang.org/x/sys/unix" - "gvisor.dev/gvisor/pkg/tcpip/header" - "gvisor.dev/gvisor/test/packetimpact/testbench" -) - -func init() { - testbench.RegisterFlags(flag.CommandLine) -} - -func TestWindowShrink(t *testing.T) { - dut := testbench.NewDUT(t) - defer dut.TearDown() - listenFd, remotePort := dut.CreateListener(unix.SOCK_STREAM, unix.IPPROTO_TCP, 1) - defer dut.Close(listenFd) - conn := testbench.NewTCPIPv4(t, testbench.TCP{DstPort: &remotePort}, testbench.TCP{SrcPort: &remotePort}) - defer conn.Close() - - conn.Connect() - acceptFd, _ := dut.Accept(listenFd) - defer dut.Close(acceptFd) - - dut.SetSockOptInt(acceptFd, unix.IPPROTO_TCP, unix.TCP_NODELAY, 1) - - sampleData := []byte("Sample Data") - samplePayload := &testbench.Payload{Bytes: sampleData} - - dut.Send(acceptFd, sampleData, 0) - if _, err := conn.ExpectData(&testbench.TCP{}, samplePayload, time.Second); err != nil { - t.Fatalf("expected payload was not received: %s", err) - } - conn.Send(testbench.TCP{Flags: testbench.Uint8(header.TCPFlagAck)}) - - dut.Send(acceptFd, sampleData, 0) - dut.Send(acceptFd, sampleData, 0) - if _, err := conn.ExpectData(&testbench.TCP{}, samplePayload, time.Second); err != nil { - t.Fatalf("expected payload was not received: %s", err) - } - if _, err := conn.ExpectData(&testbench.TCP{}, samplePayload, time.Second); err != nil { - t.Fatalf("expected payload was not received: %s", err) - } - // We close our receiving window here - conn.Send(testbench.TCP{Flags: testbench.Uint8(header.TCPFlagAck), WindowSize: testbench.Uint16(0)}) - - dut.Send(acceptFd, []byte("Sample Data"), 0) - // Note: There is another kind of zero-window probing which Windows uses (by sending one - // new byte at `RemoteSeqNum`), if netstack wants to go that way, we may want to change - // the following lines. - expectedRemoteSeqNum := *conn.RemoteSeqNum() - 1 - if _, err := conn.ExpectData(&testbench.TCP{SeqNum: testbench.Uint32(uint32(expectedRemoteSeqNum))}, nil, time.Second); err != nil { - t.Fatalf("expected a packet with sequence number %d: %s", expectedRemoteSeqNum, err) - } -} diff --git a/test/packetimpact/tests/tcp_zero_window_probe_retransmit_test.go b/test/packetimpact/tests/tcp_zero_window_probe_retransmit_test.go deleted file mode 100644 index 8c89d57c9..000000000 --- a/test/packetimpact/tests/tcp_zero_window_probe_retransmit_test.go +++ /dev/null @@ -1,105 +0,0 @@ -// Copyright 2020 The gVisor Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// http://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -package tcp_zero_window_probe_retransmit_test - -import ( - "flag" - "testing" - "time" - - "golang.org/x/sys/unix" - "gvisor.dev/gvisor/pkg/tcpip/header" - "gvisor.dev/gvisor/test/packetimpact/testbench" -) - -func init() { - testbench.RegisterFlags(flag.CommandLine) -} - -// TestZeroWindowProbeRetransmit tests retransmits of zero window probes -// to be sent at exponentially inreasing time intervals. -func TestZeroWindowProbeRetransmit(t *testing.T) { - dut := testbench.NewDUT(t) - defer dut.TearDown() - listenFd, remotePort := dut.CreateListener(unix.SOCK_STREAM, unix.IPPROTO_TCP, 1) - defer dut.Close(listenFd) - conn := testbench.NewTCPIPv4(t, testbench.TCP{DstPort: &remotePort}, testbench.TCP{SrcPort: &remotePort}) - defer conn.Close() - - conn.Connect() - acceptFd, _ := dut.Accept(listenFd) - defer dut.Close(acceptFd) - - dut.SetSockOptInt(acceptFd, unix.IPPROTO_TCP, unix.TCP_NODELAY, 1) - - sampleData := []byte("Sample Data") - samplePayload := &testbench.Payload{Bytes: sampleData} - - // Send and receive sample data to the dut. - dut.Send(acceptFd, sampleData, 0) - if _, err := conn.ExpectData(&testbench.TCP{}, samplePayload, time.Second); err != nil { - t.Fatalf("expected payload was not received: %s", err) - } - conn.Send(testbench.TCP{Flags: testbench.Uint8(header.TCPFlagAck | header.TCPFlagPsh)}, samplePayload) - if _, err := conn.ExpectData(&testbench.TCP{Flags: testbench.Uint8(header.TCPFlagAck)}, nil, time.Second); err != nil { - t.Fatalf("expected packet was not received: %s", err) - } - - // Check for the dut to keep the connection alive as long as the zero window - // probes are acknowledged. Check if the zero window probes are sent at - // exponentially increasing intervals. The timeout intervals are function - // of the recorded first zero probe transmission duration. - // - // Advertize zero receive window again. - conn.Send(testbench.TCP{Flags: testbench.Uint8(header.TCPFlagAck), WindowSize: testbench.Uint16(0)}) - probeSeq := testbench.Uint32(uint32(*conn.RemoteSeqNum() - 1)) - ackProbe := testbench.Uint32(uint32(*conn.RemoteSeqNum())) - - startProbeDuration := time.Second - current := startProbeDuration - first := time.Now() - // Ask the dut to send out data. - dut.Send(acceptFd, sampleData, 0) - // Expect the dut to keep the connection alive as long as the remote is - // acknowledging the zero-window probes. - for i := 0; i < 5; i++ { - start := time.Now() - // Expect zero-window probe with a timeout which is a function of the typical - // first retransmission time. The retransmission times is supposed to - // exponentially increase. - if _, err := conn.ExpectData(&testbench.TCP{SeqNum: probeSeq}, nil, 2*current); err != nil { - t.Fatalf("expected a probe with sequence number %d: loop %d", probeSeq, i) - } - if i == 0 { - startProbeDuration = time.Now().Sub(first) - current = 2 * startProbeDuration - continue - } - // Check if the probes came at exponentially increasing intervals. - if got, want := time.Since(start), current-startProbeDuration; got < want { - t.Errorf("got zero probe %d after %s, want >= %s", i, got, want) - } - // Acknowledge the zero-window probes from the dut. - conn.Send(testbench.TCP{AckNum: ackProbe, Flags: testbench.Uint8(header.TCPFlagAck), WindowSize: testbench.Uint16(0)}) - current *= 2 - } - // Advertize non-zero window. - conn.Send(testbench.TCP{AckNum: ackProbe, Flags: testbench.Uint8(header.TCPFlagAck)}) - // Expect the dut to recover and transmit data. - if _, err := conn.ExpectData(&testbench. - TCP{SeqNum: ackProbe}, samplePayload, time.Second); err != nil { - t.Fatalf("expected payload was not received: %s", err) - } -} diff --git a/test/packetimpact/tests/tcp_zero_window_probe_test.go b/test/packetimpact/tests/tcp_zero_window_probe_test.go deleted file mode 100644 index 649fd5699..000000000 --- a/test/packetimpact/tests/tcp_zero_window_probe_test.go +++ /dev/null @@ -1,112 +0,0 @@ -// Copyright 2020 The gVisor Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// http://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -package tcp_zero_window_probe_test - -import ( - "flag" - "testing" - "time" - - "golang.org/x/sys/unix" - "gvisor.dev/gvisor/pkg/tcpip/header" - "gvisor.dev/gvisor/test/packetimpact/testbench" -) - -func init() { - testbench.RegisterFlags(flag.CommandLine) -} - -// TestZeroWindowProbe tests few cases of zero window probing over the -// same connection. -func TestZeroWindowProbe(t *testing.T) { - dut := testbench.NewDUT(t) - defer dut.TearDown() - listenFd, remotePort := dut.CreateListener(unix.SOCK_STREAM, unix.IPPROTO_TCP, 1) - defer dut.Close(listenFd) - conn := testbench.NewTCPIPv4(t, testbench.TCP{DstPort: &remotePort}, testbench.TCP{SrcPort: &remotePort}) - defer conn.Close() - - conn.Connect() - acceptFd, _ := dut.Accept(listenFd) - defer dut.Close(acceptFd) - - dut.SetSockOptInt(acceptFd, unix.IPPROTO_TCP, unix.TCP_NODELAY, 1) - - sampleData := []byte("Sample Data") - samplePayload := &testbench.Payload{Bytes: sampleData} - - start := time.Now() - // Send and receive sample data to the dut. - dut.Send(acceptFd, sampleData, 0) - if _, err := conn.ExpectData(&testbench.TCP{}, samplePayload, time.Second); err != nil { - t.Fatalf("expected payload was not received: %s", err) - } - sendTime := time.Now().Sub(start) - conn.Send(testbench.TCP{Flags: testbench.Uint8(header.TCPFlagAck | header.TCPFlagPsh)}, samplePayload) - if _, err := conn.ExpectData(&testbench.TCP{Flags: testbench.Uint8(header.TCPFlagAck)}, nil, time.Second); err != nil { - t.Fatalf("expected packet was not received: %s", err) - } - - // Test 1: Check for receive of a zero window probe, record the duration for - // probe to be sent. - // - // Advertize zero window to the dut. - conn.Send(testbench.TCP{Flags: testbench.Uint8(header.TCPFlagAck), WindowSize: testbench.Uint16(0)}) - - // Expected sequence number of the zero window probe. - probeSeq := testbench.Uint32(uint32(*conn.RemoteSeqNum() - 1)) - // Expected ack number of the ACK for the probe. - ackProbe := testbench.Uint32(uint32(*conn.RemoteSeqNum())) - - // Expect there are no zero-window probes sent until there is data to be sent out - // from the dut. - if _, err := conn.ExpectData(&testbench.TCP{SeqNum: probeSeq}, nil, 2*time.Second); err == nil { - t.Fatalf("unexpected packet with sequence number %d: %s", probeSeq, err) - } - - start = time.Now() - // Ask the dut to send out data. - dut.Send(acceptFd, sampleData, 0) - // Expect zero-window probe from the dut. - if _, err := conn.ExpectData(&testbench.TCP{SeqNum: probeSeq}, nil, time.Second); err != nil { - t.Fatalf("expected a packet with sequence number %d: %s", probeSeq, err) - } - // Expect the probe to be sent after some time. Compare against the previous - // time recorded when the dut immediately sends out data on receiving the - // send command. - if startProbeDuration := time.Now().Sub(start); startProbeDuration <= sendTime { - t.Fatalf("expected the first probe to be sent out after retransmission interval, got %s want > %s", startProbeDuration, sendTime) - } - - // Test 2: Check if the dut recovers on advertizing non-zero receive window. - // and sends out the sample payload after the send window opens. - // - // Advertize non-zero window to the dut and ack the zero window probe. - conn.Send(testbench.TCP{AckNum: ackProbe, Flags: testbench.Uint8(header.TCPFlagAck)}) - // Expect the dut to recover and transmit data. - if _, err := conn.ExpectData(&testbench.TCP{SeqNum: ackProbe}, samplePayload, time.Second); err != nil { - t.Fatalf("expected payload was not received: %s", err) - } - - // Test 3: Sanity check for dut's processing of a similar probe it sent. - // Check if the dut responds as we do for a similar probe sent to it. - // Basically with sequence number to one byte behind the unacknowledged - // sequence number. - p := testbench.Uint32(uint32(*conn.LocalSeqNum())) - conn.Send(testbench.TCP{Flags: testbench.Uint8(header.TCPFlagAck), SeqNum: testbench.Uint32(uint32(*conn.LocalSeqNum() - 1))}) - if _, err := conn.ExpectData(&testbench.TCP{Flags: testbench.Uint8(header.TCPFlagAck), AckNum: p}, nil, time.Second); err != nil { - t.Fatalf("expected a packet with ack number: %d: %s", p, err) - } -} diff --git a/test/packetimpact/tests/tcp_zero_window_probe_usertimeout_test.go b/test/packetimpact/tests/tcp_zero_window_probe_usertimeout_test.go deleted file mode 100644 index 3c467b14f..000000000 --- a/test/packetimpact/tests/tcp_zero_window_probe_usertimeout_test.go +++ /dev/null @@ -1,98 +0,0 @@ -// Copyright 2020 The gVisor Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// http://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -package tcp_zero_window_probe_usertimeout_test - -import ( - "flag" - "testing" - "time" - - "golang.org/x/sys/unix" - "gvisor.dev/gvisor/pkg/tcpip/header" - "gvisor.dev/gvisor/test/packetimpact/testbench" -) - -func init() { - testbench.RegisterFlags(flag.CommandLine) -} - -// TestZeroWindowProbeUserTimeout sanity tests user timeout when we are -// retransmitting zero window probes. -func TestZeroWindowProbeUserTimeout(t *testing.T) { - dut := testbench.NewDUT(t) - defer dut.TearDown() - listenFd, remotePort := dut.CreateListener(unix.SOCK_STREAM, unix.IPPROTO_TCP, 1) - defer dut.Close(listenFd) - conn := testbench.NewTCPIPv4(t, testbench.TCP{DstPort: &remotePort}, testbench.TCP{SrcPort: &remotePort}) - defer conn.Close() - - conn.Connect() - acceptFd, _ := dut.Accept(listenFd) - defer dut.Close(acceptFd) - - dut.SetSockOptInt(acceptFd, unix.IPPROTO_TCP, unix.TCP_NODELAY, 1) - - sampleData := []byte("Sample Data") - samplePayload := &testbench.Payload{Bytes: sampleData} - - // Send and receive sample data to the dut. - dut.Send(acceptFd, sampleData, 0) - if _, err := conn.ExpectData(&testbench.TCP{}, samplePayload, time.Second); err != nil { - t.Fatalf("expected payload was not received: %s", err) - } - conn.Send(testbench.TCP{Flags: testbench.Uint8(header.TCPFlagAck | header.TCPFlagPsh)}, samplePayload) - if _, err := conn.ExpectData(&testbench.TCP{Flags: testbench.Uint8(header.TCPFlagAck)}, nil, time.Second); err != nil { - t.Fatalf("expected packet was not received: %s", err) - } - - // Test 1: Check for receive of a zero window probe, record the duration for - // probe to be sent. - // - // Advertize zero window to the dut. - conn.Send(testbench.TCP{Flags: testbench.Uint8(header.TCPFlagAck), WindowSize: testbench.Uint16(0)}) - - // Expected sequence number of the zero window probe. - probeSeq := testbench.Uint32(uint32(*conn.RemoteSeqNum() - 1)) - start := time.Now() - // Ask the dut to send out data. - dut.Send(acceptFd, sampleData, 0) - // Expect zero-window probe from the dut. - if _, err := conn.ExpectData(&testbench.TCP{SeqNum: probeSeq}, nil, time.Second); err != nil { - t.Fatalf("expected a packet with sequence number %d: %s", probeSeq, err) - } - // Record the duration for first probe, the dut sends the zero window probe after - // a retransmission time interval. - startProbeDuration := time.Now().Sub(start) - - // Test 2: Check if the dut times out the connection by honoring usertimeout - // when the dut is sending zero-window probes. - // - // Reduce the retransmit timeout. - dut.SetSockOptInt(acceptFd, unix.IPPROTO_TCP, unix.TCP_USER_TIMEOUT, int32(startProbeDuration.Milliseconds())) - // Advertize zero window again. - conn.Send(testbench.TCP{Flags: testbench.Uint8(header.TCPFlagAck), WindowSize: testbench.Uint16(0)}) - // Ask the dut to send out data that would trigger zero window probe retransmissions. - dut.Send(acceptFd, sampleData, 0) - - // Wait for the connection to timeout after multiple zero-window probe retransmissions. - time.Sleep(8 * startProbeDuration) - - // Expect the connection to have timed out and closed which would cause the dut - // to reply with a RST to the ACK we send. - conn.Send(testbench.TCP{Flags: testbench.Uint8(header.TCPFlagAck)}) - if _, err := conn.ExpectData(&testbench.TCP{Flags: testbench.Uint8(header.TCPFlagRst)}, nil, time.Second); err != nil { - t.Fatalf("expected a TCP RST") - } -} diff --git a/test/packetimpact/tests/udp_icmp_error_propagation_test.go b/test/packetimpact/tests/udp_icmp_error_propagation_test.go deleted file mode 100644 index b754918f6..000000000 --- a/test/packetimpact/tests/udp_icmp_error_propagation_test.go +++ /dev/null @@ -1,365 +0,0 @@ -// Copyright 2020 The gVisor Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// http://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -package udp_icmp_error_propagation_test - -import ( - "context" - "flag" - "fmt" - "net" - "sync" - "syscall" - "testing" - "time" - - "golang.org/x/sys/unix" - "gvisor.dev/gvisor/pkg/tcpip/header" - "gvisor.dev/gvisor/test/packetimpact/testbench" -) - -func init() { - testbench.RegisterFlags(flag.CommandLine) -} - -type connectionMode bool - -func (c connectionMode) String() string { - if c { - return "Connected" - } - return "Connectionless" -} - -type icmpError int - -const ( - portUnreachable icmpError = iota - timeToLiveExceeded -) - -func (e icmpError) String() string { - switch e { - case portUnreachable: - return "PortUnreachable" - case timeToLiveExceeded: - return "TimeToLiveExpired" - } - return "Unknown ICMP error" -} - -func (e icmpError) ToICMPv4() *testbench.ICMPv4 { - switch e { - case portUnreachable: - return &testbench.ICMPv4{Type: testbench.ICMPv4Type(header.ICMPv4DstUnreachable), Code: testbench.Uint8(header.ICMPv4PortUnreachable)} - case timeToLiveExceeded: - return &testbench.ICMPv4{Type: testbench.ICMPv4Type(header.ICMPv4TimeExceeded), Code: testbench.Uint8(header.ICMPv4TTLExceeded)} - } - return nil -} - -type errorDetection struct { - name string - useValidConn bool - f func(context.Context, testData) error -} - -type testData struct { - dut *testbench.DUT - conn *testbench.UDPIPv4 - remoteFD int32 - remotePort uint16 - cleanFD int32 - cleanPort uint16 - wantErrno syscall.Errno -} - -// wantErrno computes the errno to expect given the connection mode of a UDP -// socket and the ICMP error it will receive. -func wantErrno(c connectionMode, icmpErr icmpError) syscall.Errno { - if c && icmpErr == portUnreachable { - return syscall.Errno(unix.ECONNREFUSED) - } - return syscall.Errno(0) -} - -// sendICMPError sends an ICMP error message in response to a UDP datagram. -func sendICMPError(conn *testbench.UDPIPv4, icmpErr icmpError, udp *testbench.UDP) error { - layers := (*testbench.Connection)(conn).CreateFrame(nil) - layers = layers[:len(layers)-1] - ip, ok := udp.Prev().(*testbench.IPv4) - if !ok { - return fmt.Errorf("expected %s to be IPv4", udp.Prev()) - } - if icmpErr == timeToLiveExceeded { - *ip.TTL = 1 - // Let serialization recalculate the checksum since we set the TTL - // to 1. - ip.Checksum = nil - } - // Note that the ICMP payload is valid in this case because the UDP - // payload is empty. If the UDP payload were not empty, the packet - // length during serialization may not be calculated correctly, - // resulting in a mal-formed packet. - layers = append(layers, icmpErr.ToICMPv4(), ip, udp) - - (*testbench.Connection)(conn).SendFrameStateless(layers) - return nil -} - -// testRecv tests observing the ICMP error through the recv syscall. A packet -// is sent to the DUT, and if wantErrno is non-zero, then the first recv should -// fail and the second should succeed. Otherwise if wantErrno is zero then the -// first recv should succeed immediately. -func testRecv(ctx context.Context, d testData) error { - // Check that receiving on the clean socket works. - d.conn.Send(testbench.UDP{DstPort: &d.cleanPort}) - d.dut.Recv(d.cleanFD, 100, 0) - - d.conn.Send(testbench.UDP{}) - - if d.wantErrno != syscall.Errno(0) { - ctx, cancel := context.WithTimeout(ctx, time.Second) - defer cancel() - ret, _, err := d.dut.RecvWithErrno(ctx, d.remoteFD, 100, 0) - if ret != -1 { - return fmt.Errorf("recv after ICMP error succeeded unexpectedly, expected (%[1]d) %[1]v", d.wantErrno) - } - if err != d.wantErrno { - return fmt.Errorf("recv after ICMP error resulted in error (%[1]d) %[1]v, expected (%[2]d) %[2]v", err, d.wantErrno) - } - } - - d.dut.Recv(d.remoteFD, 100, 0) - return nil -} - -// testSendTo tests observing the ICMP error through the send syscall. If -// wantErrno is non-zero, the first send should fail and a subsequent send -// should suceed; while if wantErrno is zero then the first send should just -// succeed. -func testSendTo(ctx context.Context, d testData) error { - // Check that sending on the clean socket works. - d.dut.SendTo(d.cleanFD, nil, 0, d.conn.LocalAddr()) - if _, err := d.conn.Expect(testbench.UDP{SrcPort: &d.cleanPort}, time.Second); err != nil { - return fmt.Errorf("did not receive UDP packet from clean socket on DUT: %s", err) - } - - if d.wantErrno != syscall.Errno(0) { - ctx, cancel := context.WithTimeout(ctx, time.Second) - defer cancel() - ret, err := d.dut.SendToWithErrno(ctx, d.remoteFD, nil, 0, d.conn.LocalAddr()) - - if ret != -1 { - return fmt.Errorf("sendto after ICMP error succeeded unexpectedly, expected (%[1]d) %[1]v", d.wantErrno) - } - if err != d.wantErrno { - return fmt.Errorf("sendto after ICMP error resulted in error (%[1]d) %[1]v, expected (%[2]d) %[2]v", err, d.wantErrno) - } - } - - d.dut.SendTo(d.remoteFD, nil, 0, d.conn.LocalAddr()) - if _, err := d.conn.Expect(testbench.UDP{}, time.Second); err != nil { - return fmt.Errorf("did not receive UDP packet as expected: %s", err) - } - return nil -} - -func testSockOpt(_ context.Context, d testData) error { - // Check that there's no pending error on the clean socket. - if errno := syscall.Errno(d.dut.GetSockOptInt(d.cleanFD, unix.SOL_SOCKET, unix.SO_ERROR)); errno != syscall.Errno(0) { - return fmt.Errorf("unexpected error (%[1]d) %[1]v on clean socket", errno) - } - - if errno := syscall.Errno(d.dut.GetSockOptInt(d.remoteFD, unix.SOL_SOCKET, unix.SO_ERROR)); errno != d.wantErrno { - return fmt.Errorf("SO_ERROR sockopt after ICMP error is (%[1]d) %[1]v, expected (%[2]d) %[2]v", errno, d.wantErrno) - } - - // Check that after clearing socket error, sending doesn't fail. - d.dut.SendTo(d.remoteFD, nil, 0, d.conn.LocalAddr()) - if _, err := d.conn.Expect(testbench.UDP{}, time.Second); err != nil { - return fmt.Errorf("did not receive UDP packet as expected: %s", err) - } - return nil -} - -// TestUDPICMPErrorPropagation tests that ICMP error messages in response to -// UDP datagrams are processed correctly. RFC 1122 section 4.1.3.3 states that: -// "UDP MUST pass to the application layer all ICMP error messages that it -// receives from the IP layer." -// -// The test cases are parametrized in 3 dimensions: 1. the UDP socket is either -// put into connection mode or left connectionless, 2. the ICMP message type -// and code, and 3. the method by which the ICMP error is observed on the -// socket: sendto, recv, or getsockopt(SO_ERROR). -// -// Linux's udp(7) man page states: "All fatal errors will be passed to the user -// as an error return even when the socket is not connected. This includes -// asynchronous errors received from the network." In practice, the only -// combination of parameters to the test that causes an error to be observable -// on the UDP socket is receiving a port unreachable message on a connected -// socket. -func TestUDPICMPErrorPropagation(t *testing.T) { - for _, connect := range []connectionMode{true, false} { - for _, icmpErr := range []icmpError{portUnreachable, timeToLiveExceeded} { - wantErrno := wantErrno(connect, icmpErr) - - for _, errDetect := range []errorDetection{ - errorDetection{"SendTo", false, testSendTo}, - // Send to an address that's different from the one that caused an ICMP - // error to be returned. - errorDetection{"SendToValid", true, testSendTo}, - errorDetection{"Recv", false, testRecv}, - errorDetection{"SockOpt", false, testSockOpt}, - } { - t.Run(fmt.Sprintf("%s/%s/%s", connect, icmpErr, errDetect.name), func(t *testing.T) { - dut := testbench.NewDUT(t) - defer dut.TearDown() - - remoteFD, remotePort := dut.CreateBoundSocket(unix.SOCK_DGRAM, unix.IPPROTO_UDP, net.ParseIP("0.0.0.0")) - defer dut.Close(remoteFD) - - // Create a second, clean socket on the DUT to ensure that the ICMP - // error messages only affect the sockets they are intended for. - cleanFD, cleanPort := dut.CreateBoundSocket(unix.SOCK_DGRAM, unix.IPPROTO_UDP, net.ParseIP("0.0.0.0")) - defer dut.Close(cleanFD) - - conn := testbench.NewUDPIPv4(t, testbench.UDP{DstPort: &remotePort}, testbench.UDP{SrcPort: &remotePort}) - defer conn.Close() - - if connect { - dut.Connect(remoteFD, conn.LocalAddr()) - dut.Connect(cleanFD, conn.LocalAddr()) - } - - dut.SendTo(remoteFD, nil, 0, conn.LocalAddr()) - udp, err := conn.Expect(testbench.UDP{}, time.Second) - if err != nil { - t.Fatalf("did not receive message from DUT: %s", err) - } - - if err := sendICMPError(&conn, icmpErr, udp); err != nil { - t.Fatal(err) - } - - errDetectConn := &conn - if errDetect.useValidConn { - // connClean is a UDP socket on the test runner that was not - // involved in the generation of the ICMP error. As such, - // interactions between it and the the DUT should be independent of - // the ICMP error at least at the port level. - connClean := testbench.NewUDPIPv4(t, testbench.UDP{DstPort: &remotePort}, testbench.UDP{SrcPort: &remotePort}) - defer connClean.Close() - - errDetectConn = &connClean - } - - if err := errDetect.f(context.Background(), testData{&dut, errDetectConn, remoteFD, remotePort, cleanFD, cleanPort, wantErrno}); err != nil { - t.Fatal(err) - } - }) - } - } - } -} - -// TestICMPErrorDuringUDPRecv tests behavior when a UDP socket is in the middle -// of a blocking recv and receives an ICMP error. -func TestICMPErrorDuringUDPRecv(t *testing.T) { - for _, connect := range []connectionMode{true, false} { - for _, icmpErr := range []icmpError{portUnreachable, timeToLiveExceeded} { - wantErrno := wantErrno(connect, icmpErr) - - t.Run(fmt.Sprintf("%s/%s", connect, icmpErr), func(t *testing.T) { - dut := testbench.NewDUT(t) - defer dut.TearDown() - - remoteFD, remotePort := dut.CreateBoundSocket(unix.SOCK_DGRAM, unix.IPPROTO_UDP, net.ParseIP("0.0.0.0")) - defer dut.Close(remoteFD) - - // Create a second, clean socket on the DUT to ensure that the ICMP - // error messages only affect the sockets they are intended for. - cleanFD, cleanPort := dut.CreateBoundSocket(unix.SOCK_DGRAM, unix.IPPROTO_UDP, net.ParseIP("0.0.0.0")) - defer dut.Close(cleanFD) - - conn := testbench.NewUDPIPv4(t, testbench.UDP{DstPort: &remotePort}, testbench.UDP{SrcPort: &remotePort}) - defer conn.Close() - - if connect { - dut.Connect(remoteFD, conn.LocalAddr()) - dut.Connect(cleanFD, conn.LocalAddr()) - } - - dut.SendTo(remoteFD, nil, 0, conn.LocalAddr()) - udp, err := conn.Expect(testbench.UDP{}, time.Second) - if err != nil { - t.Fatalf("did not receive message from DUT: %s", err) - } - - var wg sync.WaitGroup - wg.Add(2) - go func() { - defer wg.Done() - - if wantErrno != syscall.Errno(0) { - ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second) - defer cancel() - - ret, _, err := dut.RecvWithErrno(ctx, remoteFD, 100, 0) - if ret != -1 { - t.Errorf("recv during ICMP error succeeded unexpectedly, expected (%[1]d) %[1]v", wantErrno) - return - } - if err != wantErrno { - t.Errorf("recv during ICMP error resulted in error (%[1]d) %[1]v, expected (%[2]d) %[2]v", err, wantErrno) - return - } - } - - ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second) - defer cancel() - - if ret, _, err := dut.RecvWithErrno(ctx, remoteFD, 100, 0); ret == -1 { - t.Errorf("recv after ICMP error failed with (%[1]d) %[1]", err) - } - }() - - go func() { - defer wg.Done() - - ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second) - defer cancel() - - if ret, _, err := dut.RecvWithErrno(ctx, cleanFD, 100, 0); ret == -1 { - t.Errorf("recv on clean socket failed with (%[1]d) %[1]", err) - } - }() - - // TODO(b/155684889) This sleep is to allow time for the DUT to - // actually call recv since we want the ICMP error to arrive during the - // blocking recv, and should be replaced when a better synchronization - // alternative is available. - time.Sleep(2 * time.Second) - - if err := sendICMPError(&conn, icmpErr, udp); err != nil { - t.Fatal(err) - } - - conn.Send(testbench.UDP{DstPort: &cleanPort}) - conn.Send(testbench.UDP{}) - wg.Wait() - }) - } - } -} diff --git a/test/packetimpact/tests/udp_recv_multicast_test.go b/test/packetimpact/tests/udp_recv_multicast_test.go deleted file mode 100644 index 77a9bfa1d..000000000 --- a/test/packetimpact/tests/udp_recv_multicast_test.go +++ /dev/null @@ -1,40 +0,0 @@ -// Copyright 2020 The gVisor Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// http://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -package udp_recv_multicast_test - -import ( - "flag" - "net" - "testing" - - "golang.org/x/sys/unix" - "gvisor.dev/gvisor/pkg/tcpip" - "gvisor.dev/gvisor/test/packetimpact/testbench" -) - -func init() { - testbench.RegisterFlags(flag.CommandLine) -} - -func TestUDPRecvMulticast(t *testing.T) { - dut := testbench.NewDUT(t) - defer dut.TearDown() - boundFD, remotePort := dut.CreateBoundSocket(unix.SOCK_DGRAM, unix.IPPROTO_UDP, net.ParseIP("0.0.0.0")) - defer dut.Close(boundFD) - conn := testbench.NewUDPIPv4(t, testbench.UDP{DstPort: &remotePort}, testbench.UDP{SrcPort: &remotePort}) - defer conn.Close() - conn.SendIP(testbench.IPv4{DstAddr: testbench.Address(tcpip.Address(net.ParseIP("224.0.0.1").To4()))}, testbench.UDP{}) - dut.Recv(boundFD, 100, 0) -} diff --git a/test/packetimpact/tests/udp_send_recv_dgram_test.go b/test/packetimpact/tests/udp_send_recv_dgram_test.go deleted file mode 100644 index 224feef85..000000000 --- a/test/packetimpact/tests/udp_send_recv_dgram_test.go +++ /dev/null @@ -1,90 +0,0 @@ -// Copyright 2020 The gVisor Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// http://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -package udp_send_recv_dgram_test - -import ( - "flag" - "net" - "testing" - "time" - - "golang.org/x/sys/unix" - "gvisor.dev/gvisor/test/packetimpact/testbench" -) - -func init() { - testbench.RegisterFlags(flag.CommandLine) -} - -func TestUDPRecv(t *testing.T) { - dut := testbench.NewDUT(t) - defer dut.TearDown() - boundFD, remotePort := dut.CreateBoundSocket(unix.SOCK_DGRAM, unix.IPPROTO_UDP, net.ParseIP("0.0.0.0")) - defer dut.Close(boundFD) - conn := testbench.NewUDPIPv4(t, testbench.UDP{DstPort: &remotePort}, testbench.UDP{SrcPort: &remotePort}) - defer conn.Close() - - testCases := []struct { - name string - payload []byte - }{ - {"emptypayload", nil}, - {"small payload", []byte("hello world")}, - {"1kPayload", testbench.GenerateRandomPayload(t, 1<<10)}, - // Even though UDP allows larger dgrams we don't test it here as - // they need to be fragmented and written out as individual - // frames. - } - for _, tc := range testCases { - t.Run(tc.name, func(t *testing.T) { - conn.Send(testbench.UDP{}, &testbench.Payload{Bytes: tc.payload}) - if got, want := string(dut.Recv(boundFD, int32(len(tc.payload)), 0)), string(tc.payload); got != want { - t.Fatalf("received payload does not match sent payload got: %s, want: %s", got, want) - } - }) - } -} - -func TestUDPSend(t *testing.T) { - dut := testbench.NewDUT(t) - defer dut.TearDown() - boundFD, remotePort := dut.CreateBoundSocket(unix.SOCK_DGRAM, unix.IPPROTO_UDP, net.ParseIP("0.0.0.0")) - defer dut.Close(boundFD) - conn := testbench.NewUDPIPv4(t, testbench.UDP{DstPort: &remotePort}, testbench.UDP{SrcPort: &remotePort}) - defer conn.Close() - - testCases := []struct { - name string - payload []byte - }{ - {"emptypayload", nil}, - {"small payload", []byte("hello world")}, - {"1kPayload", testbench.GenerateRandomPayload(t, 1<<10)}, - // Even though UDP allows larger dgrams we don't test it here as - // they need to be fragmented and written out as individual - // frames. - } - for _, tc := range testCases { - t.Run(tc.name, func(t *testing.T) { - conn.Drain() - if got, want := int(dut.SendTo(boundFD, tc.payload, 0, conn.LocalAddr())), len(tc.payload); got != want { - t.Fatalf("short write got: %d, want: %d", got, want) - } - if _, err := conn.ExpectData(testbench.UDP{SrcPort: &remotePort}, testbench.Payload{Bytes: tc.payload}, 1*time.Second); err != nil { - t.Fatal(err) - } - }) - } -} |