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2019-07-12Add IPPROTO_RAW, which allows raw sockets to write IP headers.Kevin Krakauer
iptables also relies on IPPROTO_RAW in a way. It opens such a socket to manipulate the kernel's tables, but it doesn't actually use any of the functionality. Blegh. PiperOrigin-RevId: 257903078
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
2019-06-06Track 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
2019-06-05Adjust route when looping multicast packetsChris Kuiper
Multicast packets are special in that their destination address does not identify a specific interface. When sending out such a packet the multicast address is the remote address, but for incoming packets it is the local address. Hence, when looping a multicast packet, the route needs to be tweaked to reflect this. PiperOrigin-RevId: 251739298
2019-05-24Remove unused wakersTamir Duberstein
These wakers are uselessly allocated and passed around; nothing ever listens for notifications on them. The code here appears to be vestigial, so removing it and allowing a nil waker to be passed seems appropriate. PiperOrigin-RevId: 249879320 Change-Id: Icd209fb77cc0dd4e5c49d7a9f2adc32bf88b4b71
2019-05-22UDP and TCP raw socket support.Kevin Krakauer
PiperOrigin-RevId: 249511348 Change-Id: I34539092cc85032d9473ff4dd308fc29dc9bfd6b
2019-05-03Implement support for SACK based recovery(RFC 6675).Bhasker Hariharan
PiperOrigin-RevId: 246536003 Change-Id: I118b745f45040be9c70cb6a1028acdb06c78d8c9
2019-05-03Proper cleanup of sockets that used REUSEPORTChris Kuiper
Fixed a small logic error that broke proper accounting of MultiPortEndpoints. PiperOrigin-RevId: 246502126 Change-Id: I1a7d6ea134f811612e545676212899a3707bc2c2
2019-05-02Support reception of multicast data on more than one socketChris Kuiper
This requires two changes: 1) Support for more than one socket to join a given multicast group. 2) Duplicate delivery of incoming multicast packets to all sockets listening for it. In addition, I tweaked the code (and added a test) to disallow duplicates IP_ADD_MEMBERSHIP calls for the same group and NIC. This is how Linux does it. PiperOrigin-RevId: 246437315 Change-Id: Icad8300b4a8c3f501d9b4cd283bd3beabef88b72
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
2019-04-02Add a raw socket transport endpoint and use it for raw ICMP sockets.Kevin Krakauer
Having raw socket code together will make it easier to add support for other raw network protocols. Currently, only ICMP uses the raw endpoint. However, adding support for other protocols such as UDP shouldn't be much more difficult than adding a few switch cases. PiperOrigin-RevId: 241564875 Change-Id: I77e03adafe4ce0fd29ba2d5dfdc547d2ae8f25bf
2019-03-28netstack/fdbased: add generic segmentation offload (GSO) supportAndrei Vagin
The linux packet socket can handle GSO packets, so we can segment packets to 64K instead of the MTU which is usually 1500. Here are numbers for the nginx-1m test: runsc: 579330.01 [Kbytes/sec] received runsc-gso: 1794121.66 [Kbytes/sec] received runc: 2122139.06 [Kbytes/sec] received and for tcp_benchmark: $ tcp_benchmark --duration 15 --ideal [ 4] 0.0-15.0 sec 86647 MBytes 48456 Mbits/sec $ tcp_benchmark --client --duration 15 --ideal [ 4] 0.0-15.0 sec 2173 MBytes 1214 Mbits/sec $ tcp_benchmark --client --duration 15 --ideal --gso 65536 [ 4] 0.0-15.0 sec 19357 MBytes 10825 Mbits/sec PiperOrigin-RevId: 240809103 Change-Id: I2637f104db28b5d4c64e1e766c610162a195775a
2019-03-26netstack: Don't exclude length when a pseudo-header checksum is calculatedAndrei Vagin
This is a preparation for GSO changes (cl/234508902). RELNOTES[gofers]: Refactor checksum code to include length, which it already did, but in a convoluted way. Should be a no-op. PiperOrigin-RevId: 240460794 Change-Id: I537381bc670b5a9f5d70a87aa3eb7252e8f5ace2
2019-03-19Add layer 2 stats (tx, rx) X (packets, bytes) to netstackBert Muthalaly
PiperOrigin-RevId: 239194420 Change-Id: Ie193e8ac2b7a6db21195ac85824a335930483971
2019-03-12Make HandleLocal apply to all non-loopback interfaces.Ian Gudger
HandleLocal is very similar conceptually to MULTICAST_LOOP, so we can unify the implementations. This has the benefit of making HandleLocal apply even when the fdbased link endpoint isn't in use. In addition, move looping logic to route creation so that it doesn't need to be run for each packet. This should improve performance. PiperOrigin-RevId: 238099480 Change-Id: I72839f16f25310471453bc9d3fb8544815b25c23
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
2019-03-05Remove unused commit() function argument to Bind.Kevin Krakauer
PiperOrigin-RevId: 236926132 Change-Id: I5cf103f22766e6e65a581de780c7bb9ca0fa3181
2019-02-28Map IPv{4,6} addresses to ethernet addressesTamir Duberstein
...in accordance with RFCs 1112 and 2464. Fixes IPv4 multicast when IP_MULTICAST_IF is specified. Don't return ErrNoRoute when no route is needed. Don't set Route.NextHop when no route is needed. PiperOrigin-RevId: 236199813 Change-Id: I48ed33e1b7f760deaa37e18ad7f1b8b62819ab43
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
2019-02-26Adds a WriteRawPacket method to the InjectableLinkEndpoint interface.Googler
Also exposes ipv4.MaxTotalSize since it is a generally useful constant. PiperOrigin-RevId: 235799755 Change-Id: I1fa8d5294bf355acf5527cfdf274b3687d3c8b13
2019-02-26Use more conservative locking in NIC.DeliverNetworkPacketAmanda Tait
An earlier CL excessively minimizes the period in which it holds a lock on NIC. This earlier CL had done this out of the mistaken impression it fixed a broken test, when in fact it just reduced the rate of failure of a flaky test in tcp_test.go. This new change holds the lock on NIC for the duration of the loop over n.endpoints. PiperOrigin-RevId: 235732487 Change-Id: I53ee6df264f093ddc4d29e9acdcba6b4838cb112
2019-02-25Fix race condition in NIC.DeliverNetworkPacketAmanda Tait
cl/234850781 introduced a race condition in NIC.DeliverNetworkPacket by failing to hold a lock. This change fixes this regressesion by acquiring a read lock before iterating through n.endpoints, and then releasing the lock once iteration is complete. PiperOrigin-RevId: 235549770 Change-Id: Ib0133288be512d478cf759c3314dc95ec3205d4b
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
2019-02-07Plumb 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
2019-02-07Internal change.Googler
PiperOrigin-RevId: 232937200 Change-Id: I5c3709cc8f1313313ff618a45e48c14a3a111cb4
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 NIC endpoint forwarding.Ian Gudger
Also adds a test for regular NIC forwarding. PiperOrigin-RevId: 231495279 Change-Id: Ic7edec249568e9ad0280cea77eac14478c9073e1
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
2018-12-16Allow sending of multicast and IPv6 link-local packets w/o route.Chris Kuiper
Same as with broadcast packets, sending of a multicast packet shouldn't require accessing the route table. The same applies to IPv6 link-local addresses, which aren't routable at all (they don't belong to any subnet by definition). PiperOrigin-RevId: 225775870 Change-Id: Ic53e6560c125a83be2be9c3d112e66b36e8dfe7b
2018-12-06Allow sending of broadcast packets w/o route.Chris Kuiper
Currently sending a broadcast packet (for DHCP, e.g.) requires a "default route" of the format "0.0.0.0/0 via 0.0.0.0 <intf>". There is no good reason for this and on devices with several ports this creates a rather akward route table with lots of such default routes (which defeats the purpose of a default route). PiperOrigin-RevId: 224378769 Change-Id: Icd7ec8a206eb08083cff9a837f6f9ab231c73a19
2018-12-04Remove incorrect code and improve testing of Stack.GetMainNICAddressChris Kuiper
This removes code that should have never made it in in the first place, but did so due to incomplete testing. With the new tests the original code fails, the new code passes. PiperOrigin-RevId: 224086966 Change-Id: I646fef76977f4528f3705f497b95fad6b3ec32bc
2018-11-14Rename incorrectly named (dst, src) arguments in DeliverNetworkPacket prototypeBert Muthalaly
...to (remote, local), reflecting the (correct) names in the implementation of DeliverNetworkPacket (see tcpip/stack/nic.go). Also trim the names in DeliverNetworkPacket and elsewhere to avoid stuttering; since the type is tcpip.LinkAddress, there's no need to include "LinkAddr" in the parameter names. Note that every callsite passes arguments in the order (src, dst). PiperOrigin-RevId: 221514396 Change-Id: I3637454ad0d6e62a19e4dcbc2a16493798bd0f09
2018-11-09Add an implementation of a SACK scoreboard as per RFC6675.Bhasker Hariharan
PiperOrigin-RevId: 220866996 Change-Id: I89d48215df57c00d6a6ec512fc18712a2ea9080b
2018-11-07Fix flaky TestCacheResolutionTimeoutFabricio Voznika
Increase timeout to prevent the entry from being found when there is delay on the address resolution goroutine that doesn't mark the request as failed. PiperOrigin-RevId: 220504789 Change-Id: I7e44fd95d8624bd69962f862fbf5517a81395f2a
2018-10-23Simplify channel managementTamir Duberstein
The channels {cancel,resCh} have roughly the same lifetime and are used for roughly the same purpose as an entry's waiters; we can unify the state management of the two mechanisms, while also reducing unncessary mutex locking and unlocking. Made some cosmetic changes while I'm here. PiperOrigin-RevId: 218343915 Change-Id: Ic69546a2b7b390162b2231f07f335dd6199472d7
2018-10-19Use correct company name in copyright headerIan Gudger
PiperOrigin-RevId: 217951017 Change-Id: Ie08bf6987f98467d07457bcf35b5f1ff6e43c035
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
2018-09-19Pass local link address to DeliverNetworkPacketBert Muthalaly
This allows a NetworkDispatcher to implement transparent bridging, assuming all implementations of LinkEndpoint.WritePacket call eth.Encode with header.EthernetFields.SrcAddr set to the passed Route.LocalLinkAddress, if it is provided. PiperOrigin-RevId: 213686651 Change-Id: I446a4ac070970202f0724ef796ff1056ae4dd72a
2018-09-17Implement packet forwarding to enable NATTamir Duberstein
PiperOrigin-RevId: 213323501 Change-Id: I0996ddbdcf097588745efe35481085d42dbaf446
2018-09-14Pass buffer.Prependable by valueTamir Duberstein
PiperOrigin-RevId: 213053370 Change-Id: I60ea89572b4fca53fd126c870fcbde74fcf52562
2018-09-12Always pass buffer.VectorisedView by valueTamir Duberstein
PiperOrigin-RevId: 212757571 Change-Id: I04200df9e45c21eb64951cd2802532fa84afcb1a
2018-09-12Add multicast supportTamir Duberstein
PiperOrigin-RevId: 212750821 Change-Id: I822fd63e48c684b45fd91f9ce057867b7eceb792
2018-09-05Fix race condition introduced in 211135505Tamir Duberstein
Now that it's possible to remove subnets, we must iterate over them with locks held. Also do the removal more efficiently while I'm here. PiperOrigin-RevId: 211737416 Change-Id: I29025ec8b0c3ad11f22d4447e8ad473f1c785463
2018-09-05Update {LinkEndpoint,NetworkEndpoint}#WritePacket to take a VectorisedViewBert Muthalaly
Makes it possible to avoid copying or allocating in cases where DeliverNetworkPacket (rx) needs to turn around and call WritePacket (tx) with its VectorisedView. Also removes the restriction on having VectorisedViews with multiple views in the write path. PiperOrigin-RevId: 211728717 Change-Id: Ie03a65ecb4e28bd15ebdb9c69f05eced18fdfcff
2018-09-05Implement Subnet removalTamir Duberstein
This was used to implement https://fuchsia-review.googlesource.com/c/garnet/+/177771. PiperOrigin-RevId: 211725098 Change-Id: Ib0acc7c13430b7341e8e0ec6eb5fc35f5cee5083
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