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2019-03-08Validate multicast addresses in multicast group operations.Ian Gudger
PiperOrigin-RevId: 237559843 Change-Id: I93a9d83a08cd3d49d5fc7fcad5b0710d0aa04aaa
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
2019-02-27Ping support via IPv4 raw sockets.Kevin Krakauer
Broadly, this change: * Enables sockets to be created via `socket(AF_INET, SOCK_RAW, IPPROTO_ICMP)`. * Passes the network-layer (IP) header up the stack to the transport endpoint, which can pass it up to the socket layer. This allows a raw socket to return the entire IP packet to users. * Adds functions to stack.TransportProtocol, stack.Stack, stack.transportDemuxer that enable incoming packets to be delivered to raw endpoints. New raw sockets of other protocols (not ICMP) just need to register with the stack. * Enables ping.endpoint to return IP headers when created via SOCK_RAW. PiperOrigin-RevId: 235993280 Change-Id: I60ed994f5ff18b2cbd79f063a7fdf15d093d845a
2019-02-25Add a SACK scoreboard to TCP endpoints.Bhasker Hariharan
This change does not make use of SACK information but adds support to track SACK information and store it in the endpoint. The actual SACK based recovery will be in a separate CL. Part of commits to add RFC 6675 support to Netstack. PiperOrigin-RevId: 235612264 Change-Id: I261f94844d7bad5abda803152ce6cc6125a467ff
2019-02-22Rename ping endpoints to icmp endpoints.Kevin Krakauer
PiperOrigin-RevId: 235248572 Change-Id: I5b0538b6feb365a98712c2a2d56d856fe80a8a09
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
2019-02-14Internal change.Googler
PiperOrigin-RevId: 234011346 Change-Id: Ic69375ddb3794dd0d3d6e62ee4dc60fdf4baf2c7
2019-02-11Do not drop packets w/ missing TCP timestamps.Bhasker Hariharan
RFC7323 recommends that if the timestamp option was negotiated then all packets should carry a TCP Timestamp and any packets that do not should be dropped. Netstack implemented this behaviour. Linux OTOH does not and will accept such packets. This change makes Netstack behaviour compatible with Linux. Also now that we allow such packets, we do need to update RTO calculations based on these packets even if timestamp option is enabled. PiperOrigin-RevId: 233432268 Change-Id: I9f4742ae6b63930ac3b5e37d8c238761e6a4b29f
2019-02-07Plumb IP_ADD_MEMBERSHIP and IP_DROP_MEMBERSHIP to netstack.Ian Gudger
Also includes a few fixes for IPv4 multicast support. IPv6 support is coming in a followup CL. PiperOrigin-RevId: 233008638 Change-Id: If7dae6222fef43fda48033f0292af77832d95e82
2019-01-31Remove license commentsMichael Pratt
Nothing reads them and they can simply get stale. Generated with: $ sed -i "s/licenses(\(.*\)).*/licenses(\1)/" **/BUILD PiperOrigin-RevId: 231818945 Change-Id: Ibc3f9838546b7e94f13f217060d31f4ada9d4bf0
2019-01-29Fix IsLost check to match the description in RFC6675.Bhasker Hariharan
quoting what "rscheff@gmx.at" pointed out over email. "IsLost in RFC3517 is defined as >= (DupThresh * SMSS) while RFC6675 improves upon this, and defines IsLost as > ((DupThresh - 1) * SMSS + 1). The latter addresses situations where partial segments (size < MSS) are sent (eg. last segment of a http protocol message sent with PSH being less than MSS is common)." PiperOrigin-RevId: 231512331 Change-Id: I1addd4a92e3e7baeb0bdda46463ebfae435da958
2019-01-15test: Tag tcp_test as flaky.Kevin Krakauer
PiperOrigin-RevId: 229427852 Change-Id: I9de8ed63f4a7672dacd3b282c863c599d00acd52
2019-01-14netstack: release port inline for listening sockets only.Zhaozhong Ni
PiperOrigin-RevId: 229243918 Change-Id: Ie14ef34e66ae851ed080f57b7d26a369a66f7664
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
2018-12-21Internal ChangeMichael Pratt
PiperOrigin-RevId: 226542979 Change-Id: Ife11ebd0a85b8a63078e6daa71b4a99a82080ac9
2018-12-21Implement SO_KEEPALIVE, TCP_KEEPIDLE, and TCP_KEEPINTVL.Ian Gudger
Within gVisor, plumb new socket options to netstack. Within netstack, fix GetSockOpt and SetSockOpt return value logic. PiperOrigin-RevId: 226532229 Change-Id: If40734e119eed633335f40b4c26facbebc791c74
2018-12-13transport/tcp: remove unused error return valuesIan Gudger
PiperOrigin-RevId: 225421480 Change-Id: I1e9259b0b7e8490164e830b73338a615129c7f0e
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
2018-12-05sentry: support save / restore of TCP bind socket after shutdown.Zhaozhong Ni
PiperOrigin-RevId: 224227677 Change-Id: I08b0e0c0574170556269900653e5bcf9e9e5c9c9
2018-12-05sentry: skip waiting for undrain for netstack TCP endpoints in error state.Zhaozhong Ni
PiperOrigin-RevId: 224214981 Change-Id: I4c1dd5b1c856f7a4f9866a5dda44a5297e92486a
2018-12-04Fix available calculation when merging TCP segmentsIan Gudger
PiperOrigin-RevId: 224033418 Change-Id: I780be973e8be68ac93e8c9e7a100002e912f40d2
2018-12-04sentry: save copy of tcp segment's delivered views to avoid in-struct pointers.Zhaozhong Ni
PiperOrigin-RevId: 224033238 Change-Id: Ie5b1854b29340843b02c123766d290a8738d7631
2018-11-29Test that full segments will be sent when delay/cork is enabledIan Gudger
PiperOrigin-RevId: 223425575 Change-Id: Idd777e04c69e6ffcbfb0bdbea828a8b8b42d7672
2018-11-15Process delayed packets when delay is disabledIan Gudger
Moving the wakeup logic into the disable blocks is an optimization. PiperOrigin-RevId: 221677028 Change-Id: Ib5a5a6d52cc77b4bbc5dedcad9ee1dbb3da98deb
2018-11-14Clean up tcp.sendDataIan Gudger
PiperOrigin-RevId: 221484739 Change-Id: I44c71f79f99d0d00a2e70a7f06d7024a62a5de0a
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
2018-11-12Remove obsolete TODOIan Gudger
PiperOrigin-RevId: 221117846 Change-Id: I2a43fd8135b1d1194ff81e98644ce6b6182ece50
2018-11-09Add an implementation of a SACK scoreboard as per RFC6675.Bhasker Hariharan
PiperOrigin-RevId: 220866996 Change-Id: I89d48215df57c00d6a6ec512fc18712a2ea9080b
2018-11-05Merge segments in sender's writeListIan Gudger
PiperOrigin-RevId: 220185891 Change-Id: Iaea73fd7b2fa8c399b989cdcaabf4885f370df4b
2018-10-31Fix a race where keepalives could be sent while there is pending dataIan Gudger
PiperOrigin-RevId: 219571556 Change-Id: I5a1042c1cb05eb2711eb01627fd298bad6c543a6
2018-10-24Mark netstack/tcpip/transport/tcp:tcp_test flakyFabricio Voznika
PiperOrigin-RevId: 218537640 Change-Id: I1c5f55a46390174e1f5caeff74b1a364fa3268d9
2018-10-23Remove blanket TODO, as it is self-evident.Adin Scannell
PiperOrigin-RevId: 218390517 Change-Id: Ic891c1626e62a6c4ed57f8180740872bcd1be177
2018-10-23Track paths and provide a rename hook.Adin Scannell
This change also adds extensive testing to the p9 package via mocks. The sanity checks and type checks are moved from the gofer into the core package, where they can be more easily validated. PiperOrigin-RevId: 218296768 Change-Id: I4fc3c326e7bf1e0e140a454cbacbcc6fd617ab55
2018-10-19Use correct company name in copyright headerIan Gudger
PiperOrigin-RevId: 217951017 Change-Id: Ie08bf6987f98467d07457bcf35b5f1ff6e43c035
2018-10-17Move Unix transport out of netstackIan Gudger
PiperOrigin-RevId: 217557656 Change-Id: I63d27635b1a6c12877279995d2d9847b6a19da9b
2018-10-15Refactor host.ConnectedEndpointIan Gudger
* Integrate recvMsg and sendMsg functions into Recv and Send respectively as they are no longer shared. * Clean up partial read/write error handling code. * Re-order code to make sense given that there is no longer a host.endpoint type. PiperOrigin-RevId: 217255072 Change-Id: Ib43fe9286452f813b8309d969be11f5fa40694cd
2018-10-15Merge host.endpoint into host.ConnectedEndpointIan Gudger
host.endpoint contained duplicated logic from the sockerpair implementation and host.ConnectedEndpoint. Remove host.endpoint in favor of a host.ConnectedEndpoint wrapped in a socketpair end. PiperOrigin-RevId: 217240096 Change-Id: I4a3d51e3fe82bdf30e2d0152458b8499ab4c987c
2018-10-10Enforce message size limits and avoid host calls with too many iovecsMichael Pratt
Currently, in the face of FileMem fragmentation and a large sendmsg or recvmsg call, host sockets may pass > 1024 iovecs to the host, which will immediately cause the host to return EMSGSIZE. When we detect this case, use a single intermediate buffer to pass to the kernel, copying to/from the src/dst buffer. To avoid creating unbounded intermediate buffers, enforce message size checks and truncation w.r.t. the send buffer size. The same functionality is added to netstack unix sockets for feature parity. PiperOrigin-RevId: 216590198 Change-Id: I719a32e71c7b1098d5097f35e6daf7dd5190eff7
2018-09-28Block for link address resolutionSepehr Raissian
Previously, if address resolution for UDP or Ping sockets required sending packets using Write in Transport layer, Resolve would return ErrWouldBlock and Write would return ErrNoLinkAddress. Meanwhile startAddressResolution would run in background. Further calls to Write using same address would also return ErrNoLinkAddress until resolution has been completed successfully. Since Write is not allowed to block and System Calls need to be interruptible in System Call layer, the caller to Write is responsible for blocking upon return of ErrWouldBlock. Now, when startAddressResolution is called a notification channel for the completion of the address resolution is returned. The channel will traverse up to the calling function of Write as well as ErrNoLinkAddress. Once address resolution is complete (success or not) the channel is closed. The caller would call Write again to send packets and check if address resolution was compeleted successfully or not. Fixes google/gvisor#5 Change-Id: Idafaf31982bee1915ca084da39ae7bd468cebd93 PiperOrigin-RevId: 214962200
2018-09-21Remove unnecessary deferIan Gudger
PiperOrigin-RevId: 214073949 Change-Id: I8fab916cd77362c13dac2c9dcf2ecc1710d87a5e
2018-09-19Fix data race on tcp.endpoint.hardError in tcp.(*endpoint).ReadIan Gudger
tcp.endpoint.hardError is protected by tcp.endpoint.mu. PiperOrigin-RevId: 213730698 Change-Id: I4e4f322ac272b145b500b1a652fbee0c7b985be2
2018-09-19Fix RTT estimation when timestamp option is enabled.Bhasker Hariharan
From RFC7323#Section-4 The [RFC6298] RTT estimator has weighting factors, alpha and beta, based on an implicit assumption that at most one RTTM will be sampled per RTT. When multiple RTTMs per RTT are available to update the RTT estimator, an implementation SHOULD try to adhere to the spirit of the history specified in [RFC6298]. An implementation suggestion is detailed in Appendix G. From RFC7323#appendix-G Appendix G. RTO Calculation Modification Taking multiple RTT samples per window would shorten the history calculated by the RTO mechanism in [RFC6298], and the below algorithm aims to maintain a similar history as originally intended by [RFC6298]. It is roughly known how many samples a congestion window worth of data will yield, not accounting for ACK compression, and ACK losses. Such events will result in more history of the path being reflected in the final value for RTO, and are uncritical. This modification will ensure that a similar amount of time is taken into account for the RTO estimation, regardless of how many samples are taken per window: ExpectedSamples = ceiling(FlightSize / (SMSS * 2)) alpha' = alpha / ExpectedSamples beta' = beta / ExpectedSamples Note that the factor 2 in ExpectedSamples is due to "Delayed ACKs". Instead of using alpha and beta in the algorithm of [RFC6298], use alpha' and beta' instead: RTTVAR <- (1 - beta') * RTTVAR + beta' * |SRTT - R'| SRTT <- (1 - alpha') * SRTT + alpha' * R' (for each sample R') PiperOrigin-RevId: 213644795 Change-Id: I52278b703540408938a8edb8c38be97b37f4a10e
2018-09-17Prevent TCP connect from picking bound portsTamir Duberstein
PiperOrigin-RevId: 213387851 Change-Id: Icc6850761bc11afd0525f34863acd77584155140
2018-09-14Pass buffer.Prependable by valueTamir Duberstein
PiperOrigin-RevId: 213053370 Change-Id: I60ea89572b4fca53fd126c870fcbde74fcf52562
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