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2020-06-11Refactor packetimpact Connection typesgVisor bot
Reorganize the Connection types such that the defined types no longer expose the lower-level functions SendFrame and CreateFrame. These methods are still exported on the underlying Connection type, and thus can be accessed via a type-cast. In future, defined types should have one or more type-safe versions of the send() method on Connection, e.g. UDPIPv4 has Send() which allows the UDP header to be overridden and SendIP() which allows both the IPv4 and UDP headers to be modified. testbench.Connection gets a SendFrameStateless method which sends frames without updating the state of any of the layers. This should be used when sending out-of-band control messages such as ICMP messages, as using the normal Send method can result in errors when attempting to update the TCP state using an ICMP packet. Also remove the localAddr field of testbench.Connection and instead compute it on the fly as needed for UDPIPv4 and TCPIPv4. PiperOrigin-RevId: 315969714
2020-06-05Handle TCP segment split cases as per MSS.Mithun Iyer
- Always split segments larger than MSS. Currently, we base the segment split decision as a function of the send congestion window and MSS, which could be greater than the MSS advertised by remote. - While splitting segments, ensure the PSH flag is reset when there are segments that are queued to be sent. - With TCP_CORK, hold up segments up until MSS. Fix a bug in computing available send space before attempting to coalesce segments. Fixes #2832 PiperOrigin-RevId: 314802928
2020-05-29Test TCP should queue RECEIVE request in SYN-SENTZeling Feng
PiperOrigin-RevId: 313878910
2020-05-29Move TCP to CLOSED from SYN-RCVD on RST.Mithun Iyer
RST handling is broken when the TCP state transitions from SYN-SENT to SYN-RCVD in case of simultaneous open. An incoming RST should trigger cleanup of the endpoint. RFC793, section 3.9, page 70. Fixes #2814 PiperOrigin-RevId: 313828777
2020-05-26Automated rollback of changelist 311424257gVisor bot
PiperOrigin-RevId: 313300554
2020-05-18Support TCP options for packetimpactZeling Feng
PiperOrigin-RevId: 312119730
2020-05-13Automated rollback of changelist 311285868Bhasker Hariharan
PiperOrigin-RevId: 311424257
2020-05-13Replace test_runner.sh bash script with Go.Ian Gudger
PiperOrigin-RevId: 311285868
2020-05-11Internal change.gVisor bot
PiperOrigin-RevId: 311011004
2020-05-08Add UDP send/recv packetimpact tests.Bhasker Hariharan
Fixes #2654 PiperOrigin-RevId: 310642216
2020-05-06Internal change.gVisor bot
PiperOrigin-RevId: 310213705
2020-04-28Internal change.gVisor bot
PiperOrigin-RevId: 308940886
2020-04-24Add ICMP6 param problem testEyal Soha
Tested: When run on Linux, a correct ICMPv6 response is received. On netstack, no ICMPv6 response is received. PiperOrigin-RevId: 308343113
2020-04-24Better error message from ExpectFrameEyal Soha
Display the errors as diffs between the expected and wanted frame. PiperOrigin-RevId: 308333271
2020-04-23Fix Layer merge and add unit testsEyal Soha
mergo was improperly merging nil and empty strings PiperOrigin-RevId: 308170862
2020-04-23Simplify Docker test infrastructure.Adin Scannell
This change adds a layer of abstraction around the internal Docker APIs, and eliminates all direct dependencies on Dockerfiles in the infrastructure. A subsequent change will automated the generation of local images (with efficient caching). Note that this change drops the use of bazel container rules, as that experiment does not seem to be viable. PiperOrigin-RevId: 308095430
2020-04-22Add comments about deepcopy in Layer.incoming()Eyal Soha
PiperOrigin-RevId: 307812340
2020-04-21Don't ignore override if it is longer than layerStatesgVisor bot
PiperOrigin-RevId: 307708653
2020-04-16Use multierr in packetimpact Connection.Close()Eyal Soha
PiperOrigin-RevId: 306930652
2020-04-16Test TCP behavior when receiving unacceptable segment in CLOSE_WAITgVisor bot
TCP, in CLOSE-WAIT state, MUST return ACK with proper SEQ and ACK numbers after recv a seg with OTW SEQ or unacc ACK number, and remain in same state. If the connection is in a synchronized state, any unacceptable segment (out of window sequence number or unacceptable acknowledgment number) must elicit only an empty acknowledgment segment containing the current send-sequence number and an acknowledgment indicating the next sequence number expected to be received, and the connection remains in the same state. PiperOrigin-RevId: 306897984
2020-04-15Add tests for segments outside the receive window.Eyal Soha
The tests are based on RFC 793 page 69. Updates #1607 PiperOrigin-RevId: 306768847
2020-04-15Use hex.Dump for Layer.String() of byte slices.Eyal Soha
PiperOrigin-RevId: 306726587
2020-04-15Refactor connections.go to make it easier to add new connection types.Eyal Soha
Rather than have a struct for the state of each type of connection, such as TCP/IPv4, UDP/IPv4, TCP/IPv6, etc, have a state for each layer, such as UDP, TCP, IPv4, IPv6. Those states can be composed into connections. Tested: Existing unit tests still pass/fail as expected. PiperOrigin-RevId: 306703180
2020-04-13Add Sniffer.Drain() draining socket receive buffergVisor bot
Add Sniffer.Drain() which drains the socket's receive buffer by temporarily setting the socket to non-blocking, and receiving in a loop until EINTR, EWOULDBLOCK or EAGAIN. This method should be used when long periods of time elapses without receiving on the socket, because uninteresting packets may have piled up in the receive buffer, filling it up and causing packets critical to test operation to be dropped. PiperOrigin-RevId: 306380480
2020-04-12Refactor parser to use a for loop instead of recursion.Eyal Soha
This makes the code shorter and less repetitive. TESTED: All unit tests still pass. PiperOrigin-RevId: 306161475
2020-04-11Improve error messages when parsing headers.Eyal Soha
Tested: Looked at output of failing tests. PiperOrigin-RevId: 306031407
2020-04-08Dereference pointers in Layer's Stringer implgVisor bot
Dereference any fields which are pointers before string formatting so that the value pointed to ends up in the string representation. Tested: Added TestLayerStringFormat to //third_party/gvisor/test/packetimpact/testbench:testbench_test PiperOrigin-RevId: 305627821
2020-04-08Return all packets when Expect fails.Eyal Soha
PiperOrigin-RevId: 305466309
2020-04-07Test TCP sender behavior against window shrinkinggVisor bot
RFC 1122 Section 3.7: A sending TCP MUST be robust against window shrinking, which may cause the "useable window" to become negative. PiperOrigin-RevId: 305377072
2020-04-07Internal change.gVisor bot
PiperOrigin-RevId: 305341059
2020-04-06Sort posix service functionsEyal Soha
PiperOrigin-RevId: 305157179
2020-04-06Implement Stringer for LayerEyal Soha
Tested: Sample output for printing 3 different Layer structs: &testbench.Ether{SrcAddr:02:42:c4:77:5d:14 DstAddr:02:42:c4:77:5d:0a} &testbench.IPv4{SrcAddr:196.119.93.20 DstAddr:224.0.0.1} &testbench.UDP{SrcPort:0xc00033b260 DstPort:0xc00033b280} Sample output for printing a Layers struct (word-wrapped): [&testbench.Ether{SrcAddr:02:42:c4:77:5d:14 DstAddr:02:42:c4:77:5d:0a} &testbench.IPv4{SrcAddr:196.119.93.20 DstAddr:224.0.0.1} &testbench.UDP{SrcPort:0xc00033b260 DstPort:0xc00033b280} &testbench.Payload{Bytes:[104 101 108 108 111 32 119 111 114 108 100]}] PiperOrigin-RevId: 305014376
2020-04-01Add context.Context argument to XxxWithErrno functionsEyal Soha
This allows control over the gRPC timeouts as needed. PiperOrigin-RevId: 304225713
2020-03-31Test receiving multicast packets over UDPEyal Soha
PiperOrigin-RevId: 304098611
2020-03-17Packetimpact in Go with c++ stubEyal Soha
PiperOrigin-RevId: 301382690
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