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path: root/pkg/tcpip/tcpip.go
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2019-10-10Fix bugs in fragment handling.Bhasker Hariharan
Strengthen the header.IPv4.IsValid check to correctly check for IHL/TotalLength fields. Also add a check to make sure fragmentOffsets + size of the fragment do not cause a wrap around for the end of the fragment. PiperOrigin-RevId: 274049313
2019-10-09Internal change.gVisor bot
PiperOrigin-RevId: 273861936
2019-10-07Implement IP_TTL.Ian Gudger
Also change the default TTL to 64 to match Linux. PiperOrigin-RevId: 273430341
2019-10-03Implement proper local broadcast behaviorChris Kuiper
The behavior for sending and receiving local broadcast (255.255.255.255) traffic is as follows: Outgoing -------- * A broadcast packet sent on a socket that is bound to an interface goes out that interface * A broadcast packet sent on an unbound socket follows the route table to select the outgoing interface + if an explicit route entry exists for 255.255.255.255/32, use that one + else use the default route * Broadcast packets are looped back and delivered following the rules for incoming packets (see next). This is the same behavior as for multicast packets, except that it cannot be disabled via sockopt. Incoming -------- * Sockets wishing to receive broadcast packets must bind to either INADDR_ANY (0.0.0.0) or INADDR_BROADCAST (255.255.255.255). No other socket receives broadcast packets. * Broadcast packets are multiplexed to all sockets matching it. This is the same behavior as for multicast packets. * A socket can bind to 255.255.255.255:<port> and then receive its own broadcast packets sent to 255.255.255.255:<port> In addition, this change implicitly fixes an issue with multicast reception. If two sockets want to receive a given multicast stream and one is bound to ANY while the other is bound to the multicast address, only one of them will receive the traffic. PiperOrigin-RevId: 272792377
2019-09-27Implement SO_BINDTODEVICE sockoptgVisor bot
PiperOrigin-RevId: 271644926
2019-09-23netstack: convert more socket options to {Set,Get}SockOptIntAndrei Vagin
PiperOrigin-RevId: 270763208
2019-09-12Implement splice methods for pipes and sockets.Adin Scannell
This also allows the tee(2) implementation to be enabled, since dup can now be properly supported via WriteTo. Note that this change necessitated some minor restructoring with the fs.FileOperations splice methods. If the *fs.File is passed through directly, then only public API methods are accessible, which will deadlock immediately since the locking is already done by fs.Splice. Instead, we pass through an abstract io.Reader or io.Writer, which elide locks and use the underlying fs.FileOperations directly. PiperOrigin-RevId: 268805207
2019-09-06Remove reundant global tcpip.LinkEndpointID.Ian Gudger
PiperOrigin-RevId: 267709597
2019-09-04Handle subnet and broadcast addresses correctly with NIC.subnetsChris Kuiper
This also renames "subnet" to "addressRange" to avoid any more confusion with an interface IP's subnet. Lastly, this also removes the Stack.ContainsSubnet(..) API since it isn't used by anyone. Plus the same information can be obtained from Stack.NICAddressRanges(). PiperOrigin-RevId: 267229843
2019-09-03Make UDP traceroute work.Bhasker Hariharan
Adds support to generate Port Unreachable messages for UDP datagrams received on a port for which there is no valid endpoint. Fixes #703 PiperOrigin-RevId: 267034418
2019-08-23Implement fmt.Stringer on Route by valueTamir Duberstein
This is more convenient, since it implements the interface for both value and pointer. PiperOrigin-RevId: 265086510
2019-08-21Use tcpip.Subnet in tcpip.RouteTamir Duberstein
This is the first step in replacing some of the redundant types with the standard library equivalents. PiperOrigin-RevId: 264706552
2019-08-20Add tcpip.Route.String and tcpip.AddressMask.PrefixChris Kuiper
PiperOrigin-RevId: 264544163
2019-08-16netstack: disconnect an unix socket only if the address family is AF_UNSPECAndrei Vagin
Linux allows to call connect for ANY and the zero port. PiperOrigin-RevId: 263892534
2019-08-16Add subnet checking to NIC.findEndpoint and consolidate with NIC.getRefChris Kuiper
This adds the same logic to NIC.findEndpoint that is already done in NIC.getRef. Since this makes the two functions very similar they were combined into one with the originals being wrappers. PiperOrigin-RevId: 263864708
2019-08-14Replace uinptr with int64 when returning lengthsTamir Duberstein
This is in accordance with newer parts of the standard library. PiperOrigin-RevId: 263449916
2019-08-14Add tcpip.AddressWithPrefix.StringTamir Duberstein
PiperOrigin-RevId: 263436592
2019-08-08netstack: Don't start endpoint goroutines too soon on restore.Rahat Mahmood
Endpoint protocol goroutines were previously started as part of loading the endpoint. This is potentially too soon, as resources used by these goroutine may not have been loaded. Protocol goroutines may perform meaningful work as soon as they're started (ex: incoming connect) which can cause them to indirectly access resources that haven't been loaded yet. This CL defers resuming all protocol goroutines until the end of restore. PiperOrigin-RevId: 262409429
2019-08-02Plumbing for iptables sockopts.Kevin Krakauer
PiperOrigin-RevId: 261413396
2019-08-02Automated rollback of changelist 261191548Rahat Mahmood
PiperOrigin-RevId: 261373749
2019-08-01Implement getsockopt(TCP_INFO).Rahat Mahmood
Export some readily-available fields for TCP_INFO and stub out the rest. PiperOrigin-RevId: 261191548
2019-07-24Add support for a subnet prefix length on interface network addressesChris Kuiper
This allows the user code to add a network address with a subnet prefix length. The prefix length value is stored in the network endpoint and provided back to the user in the ProtocolAddress type. PiperOrigin-RevId: 259807693
2019-07-18net/tcp/setockopt: impelment setsockopt(fd, SOL_TCP, TCP_INQ)Andrei Vagin
PiperOrigin-RevId: 258859507
2019-07-12Stub out support for TCP_MAXSEG.Bhasker Hariharan
Adds support to set/get the TCP_MAXSEG value but does not really change the segment sizes emitted by netstack or alter the MSS advertised by the endpoint. This is currently being added only to unblock iperf3 on gVisor. Plumbing this correctly requires a bit more work which will come in separate CLs. PiperOrigin-RevId: 257859112
2019-07-03netstack/udp: connect with the AF_UNSPEC address family means disconnectAndrei Vagin
PiperOrigin-RevId: 256433283
2019-06-27Fix various spelling issues in the documentationMichael Pratt
Addresses obvious typos, in the documentation only. COPYBARA_INTEGRATE_REVIEW=https://github.com/google/gvisor/pull/443 from Pixep:fix/documentation-spelling 4d0688164eafaf0b3010e5f4824b35d1e7176d65 PiperOrigin-RevId: 255477779
2019-06-13Add support for TCP receive buffer auto tuning.Bhasker Hariharan
The implementation is similar to linux where we track the number of bytes consumed by the application to grow the receive buffer of a given TCP endpoint. This ensures that the advertised window grows at a reasonable rate to accomodate for the sender's rate and prevents large amounts of data being held in stack buffers if the application is not actively reading or not reading fast enough. The original paper that was used to implement the linux receive buffer auto- tuning is available @ https://public.lanl.gov/radiant/pubs/drs/lacsi2001.pdf NOTE: Linux does not implement DRS as defined in that paper, it's just a good reference to understand the solution space. Updates #230 PiperOrigin-RevId: 253168283
2019-06-13Update canonical repository.Adin Scannell
This can be merged after: https://github.com/google/gvisor-website/pull/77 or https://github.com/google/gvisor-website/pull/78 PiperOrigin-RevId: 253132620
2019-06-12Add support for TCP_CONGESTION socket option.Bhasker Hariharan
This CL also cleans up the error returned for setting congestion control which was incorrectly returning EINVAL instead of ENOENT. PiperOrigin-RevId: 252889093
2019-06-06Track and export socket state.Rahat Mahmood
This is necessary for implementing network diagnostic interfaces like /proc/net/{tcp,udp,unix} and sock_diag(7). For pass-through endpoints such as hostinet, we obtain the socket state from the backend. For netstack, we add explicit tracking of TCP states. PiperOrigin-RevId: 251934850
2019-05-30Fixes to TCP listen behavior.Bhasker Hariharan
Netstack listen loop can get stuck if cookies are in-use and the app is slow to accept incoming connections. Further we continue to complete handshake for a connection even if the backlog is full. This creates a problem when a lots of connections come in rapidly and we end up with lots of completed connections just hanging around to be delivered. These fixes change netstack behaviour to mirror what linux does as described here in the following article http://veithen.io/2014/01/01/how-tcp-backlog-works-in-linux.html Now when cookies are not in-use Netstack will silently drop the ACK to a SYN-ACK and not complete the handshake if the backlog is full. This will result in the connection staying in a half-complete state. Eventually the sender will retransmit the ACK and if backlog has space we will transition to a connected state and deliver the endpoint. Similarly when cookies are in use we do not try and create an endpoint unless there is space in the accept queue to accept the newly created endpoint. If there is no space then we again silently drop the ACK as we can just recreate it when the ACK is retransmitted by the peer. We also now use the backlog to cap the size of the SYN-RCVD queue for a given endpoint. So at any time there can be N connections in the backlog and N in a SYN-RCVD state if the application is not accepting connections. Any new SYNs will be dropped. This CL also fixes another small bug where we mark a new endpoint which has not completed handshake as connected. We should wait till handshake successfully completes before marking it connected. Updates #236 PiperOrigin-RevId: 250717817
2019-05-03Update tcpip Clock description.Ian Gudger
The tcpip.Clock comment stated that times provided by it should not be used for netstack internal timekeeping. This comment was from before the interface supported monotonic times. The monotonic times that it provides are now be the preferred time source for netstack internal timekeeping. PiperOrigin-RevId: 246618772 Change-Id: I853b720e3d719b03fabd6156d2431da05d354bda
2019-04-29Change copyright notice to "The gVisor Authors"Michael Pratt
Based on the guidelines at https://opensource.google.com/docs/releasing/authors/. 1. $ rg -l "Google LLC" | xargs sed -i 's/Google LLC.*/The gVisor Authors./' 2. Manual fixup of "Google Inc" references. 3. Add AUTHORS file. Authors may request to be added to this file. 4. Point netstack AUTHORS to gVisor AUTHORS. Drop CONTRIBUTORS. Fixes #209 PiperOrigin-RevId: 245823212 Change-Id: I64530b24ad021a7d683137459cafc510f5ee1de9
2019-04-29Allow and document bug ids in gVisor codebase.Nicolas Lacasse
PiperOrigin-RevId: 245818639 Change-Id: I03703ef0fb9b6675955637b9fe2776204c545789
2019-04-26Make raw sockets a toggleable feature disabled by default.Kevin Krakauer
PiperOrigin-RevId: 245511019 Change-Id: Ia9562a301b46458988a6a1f0bbd5f07cbfcb0615
2019-04-09Add TCP checksum verification.Bhasker Hariharan
PiperOrigin-RevId: 242704699 Change-Id: I87db368ca343b3b4bf4f969b17d3aa4ce2f8bd4f
2019-03-28Add ICMP statsBert Muthalaly
PiperOrigin-RevId: 240848882 Change-Id: I23dd4599f073263437aeab357c3f767e1a432b82
2019-03-08Implement IP_MULTICAST_LOOP.Ian Gudger
IP_MULTICAST_LOOP controls whether or not multicast packets sent on the default route are looped back. In order to implement this switch, support for sending and looping back multicast packets on the default route had to be implemented. For now we only support IPv4 multicast. PiperOrigin-RevId: 237534603 Change-Id: I490ac7ff8e8ebef417c7eb049a919c29d156ac1c
2019-03-05Add new retransmissions and recovery related metrics.Bhasker Hariharan
PiperOrigin-RevId: 236945145 Change-Id: I051760d95154ea5574c8bb6aea526f488af5e07b
2019-03-05Remove unused commit() function argument to Bind.Kevin Krakauer
PiperOrigin-RevId: 236926132 Change-Id: I5cf103f22766e6e65a581de780c7bb9ca0fa3181
2019-02-20Implement Broadcast supportAmanda Tait
This change adds support for the SO_BROADCAST socket option in gVisor Netstack. This support includes getsockopt()/setsockopt() functionality for both UDP and TCP endpoints (the latter being a NOOP), dispatching broadcast messages up and down the stack, and route finding/creation for broadcast packets. Finally, a suite of tests have been implemented, exercising this functionality through the Linux syscall API. PiperOrigin-RevId: 234850781 Change-Id: If3e666666917d39f55083741c78314a06defb26c
2019-02-15Implement IP_MULTICAST_IF.Ian Gudger
This allows setting a default send interface for IPv4 multicast. IPv6 support will come later. PiperOrigin-RevId: 234251379 Change-Id: I65922341cd8b8880f690fae3eeb7ddfa47c8c173
2019-02-15Move SO_TIMESTAMP from different transport endpoints to epsocket.Kevin Krakauer
SO_TIMESTAMP is reimplemented in ping and UDP sockets (and needs to be added for TCP), but can just be implemented in epsocket for simplicity. This will also make SIOCGSTAMP easier to implement. PiperOrigin-RevId: 234179300 Change-Id: Ib5ea0b1261dc218c1a8b15a65775de0050fe3230
2019-01-08Implement Stringer for tcpip.StatCounterBert Muthalaly
This enables formatting tcpip.Stats readably with %+v. PiperOrigin-RevId: 228379088 Change-Id: I6a9876454a22f151ee752cf94589b4188729458f
2018-12-28Implement SO_REUSEPORT for TCP and UDP socketsAndrei Vagin
This option allows multiple sockets to be bound to the same port. Incoming packets are distributed to sockets using a hash based on source and destination addresses. This means that all packets from one sender will be received by the same server socket. PiperOrigin-RevId: 227153413 Change-Id: I59b6edda9c2209d5b8968671e9129adb675920cf
2018-12-21Stub out SO_OOBINLINE.Ian Gudger
We don't explicitly support out-of-band data and treat it like normal in-band data. This is equilivent to SO_OOBINLINE being enabled, so always report that it is enabled. PiperOrigin-RevId: 226572742 Change-Id: I4c30ccb83265e76c30dea631cbf86822e6ee1c1b
2018-12-09Stub out TCP_QUICKACKIan Gudger
PiperOrigin-RevId: 224696233 Change-Id: I45c425d9e32adee5dcce29ca7439a06567b26014
2018-12-06Fix tcpip.Endpoint.Write contract regarding short writesIan Gudger
* Clarify tcpip.Endpoint.Write contract regarding short writes. * Enforce tcpip.Endpoint.Write contract regarding short writes. * Update relevant users of tcpip.Endpoint.Write. PiperOrigin-RevId: 224377586 Change-Id: I24299ecce902eb11317ee13dae3b8d8a7c5b097d
2018-11-13Implement TCP_NODELAY and TCP_CORKIan Gudger
Previously, TCP_NODELAY was always enabled and we would lie about it being configurable. TCP_NODELAY is now disabled by default (to match Linux) in the socket layer so that non-gVisor users don't automatically start using this questionable optimization. PiperOrigin-RevId: 221368472 Change-Id: Ib0240f66d94455081f4e0ca94f09d9338b2c1356
2018-10-19Use correct company name in copyright headerIan Gudger
PiperOrigin-RevId: 217951017 Change-Id: Ie08bf6987f98467d07457bcf35b5f1ff6e43c035
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