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2019-06-10Fixes to listen backlog handling.Bhasker Hariharan
Changes netstack to confirm to current linux behaviour where if the backlog is full then we drop the SYN and do not send a SYN-ACK. Similarly we allow upto backlog connections to be in SYN-RCVD state as long as the backlog is not full. We also now drop a SYN if syn cookies are in use and the backlog for the listening endpoint is full. Added new tests to confirm the behaviour. Also reverted the change to increase the backlog in TcpPortReuseMultiThread syscall test. Fixes #236 PiperOrigin-RevId: 252500462
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
2019-06-06Add multi-fd support to fdbased endpoint.Bhasker Hariharan
This allows an fdbased endpoint to have multiple underlying fd's from which packets can be read and dispatched/written to. This should allow for higher throughput as well as better scalability of the network stack as number of connections increases. Updates #231 PiperOrigin-RevId: 251852825
2019-06-05netstack/sniffer: log GSO attributesAndrei Vagin
PiperOrigin-RevId: 251788534
2019-06-05netstack/tcp: fix calculating a number of outstanding packetsAndrei Vagin
In case of GSO, a segment can container more than one packet and we need to use the pCount() helper to get a number of packets. PiperOrigin-RevId: 251743020
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
2019-06-04Fix data race in synRcvdState.Bhasker Hariharan
When checking the length of the acceptedChan we should hold the endpoint mutex otherwise a syn received while the listening socket is being closed can result in a data race where the cleanupLocked routine sets acceptedChan to nil while a handshake goroutine in progress could try and check it at the same time. PiperOrigin-RevId: 251537697
2019-06-03Delete debug log lines left by mistake.Bhasker Hariharan
Updates #236 PiperOrigin-RevId: 251337915
2019-05-31Disable certain tests that are flaky under race detector.Bhasker Hariharan
PiperOrigin-RevId: 250976665
2019-05-31Change segment queue limit to be of fixed size.Bhasker Hariharan
Netstack sets the unprocessed segment queue size to match the receive buffer size. This is not required as this queue only needs to hold enough for a short duration before the endpoint goroutine can process it. Updates #230 PiperOrigin-RevId: 250976323
2019-05-30Add build guard to files using go:linknameFabricio Voznika
Funcion signatures are not validated during compilation. Since they are not exported, they can change at any time. The guard ensures that they are verified at least on every version upgrade. PiperOrigin-RevId: 250733742
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
2019-05-24Remove 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
2019-05-21Refactor fdbased endpoint dispatcher code.Bhasker Hariharan
This is in preparation to support an fdbased endpoint that can read/dispatch packets from multiple underlying fds. Updates #231 PiperOrigin-RevId: 249337074 Change-Id: Id7d375186cffcf55ae5e38986e7d605a96916d35
2019-05-08Set the FilesytemType in MountSource from the Filesystem.Nicolas Lacasse
And stop storing the Filesystem in the MountSource. This allows us to decouple the MountSource filesystem type from the name of the filesystem. PiperOrigin-RevId: 247292982 Change-Id: I49cbcce3c17883b7aa918ba76203dfd6d1b03cc8
2019-05-07Check GSO for nil in WritePacketGoogler
Testing: Unit tests added PiperOrigin-RevId: 247096269 Change-Id: I849c010eadcb53caf45896a15ef38162d66a9568
2019-05-07Add gonet.DialContextTCP.Ian Gudger
Allows cancellation and timeouts. PiperOrigin-RevId: 247090428 Change-Id: I91907f12e218677dcd0e0b6d72819deedbd9f20c
2019-05-05Fix raw socket behavior and tests.Kevin Krakauer
Some behavior was broken due to the difficulty of running automated raw socket tests. Change-Id: I152ca53916bb24a0208f2dc1c4f5bc87f4724ff6 PiperOrigin-RevId: 246747067
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
2019-05-03Support IPv4 fragmentation in netstackGoogler
Testing: Unit tests and also large ping in Fuchsia OS PiperOrigin-RevId: 246563592 Change-Id: Ia12ab619f64f4be2c8d346ce81341a91724aef95
2019-05-03Fix transport/raw copybara exportTamir Duberstein
- include packet_list.go - exclude state.go (by renaming to include an underscore) Also rename raw.go to endpoint.go for consistency. PiperOrigin-RevId: 246547912 Change-Id: I19c8331c794ba683a940cc96a8be6497b53ff24d
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
2019-04-26tcpip/adapters/gonet: add CloseRead & CloseWrite methods to ConnBen Burkert
Add the CloseRead & CloseWrite methods that performs shutdown on the corresponding Read & Write sides of a connection. Change-Id: I3996a2abdc7cd68a2becba44dc4bd9f0919d2ce1 PiperOrigin-RevId: 245537950
2019-04-26Make raw sockets a toggleable feature disabled by default.Kevin Krakauer
PiperOrigin-RevId: 245511019 Change-Id: Ia9562a301b46458988a6a1f0bbd5f07cbfcb0615
2019-04-26Bump the AF_PACKET socket rcv buf size to 4MB by default.Bhasker Hariharan
Packet socket receive buffers default to the sysctl value of net.core.rmem_default and are capped by net.core.rmem_max both which are usually set to 208KB on most systems. Since we can't expect every gVisor user to bump these we use SO_RCVBUFFORCE to exceed the limit. This is possible as runsc runs with CAP_NET_ADMIN outside the sandbox and can do this before the FD is passed to the sentry inside the sandbox. Updates #211 iperf output w/ 4MB buffer. iperf3 -c 172.17.0.2 -t 100 Connecting to host 172.17.0.2, port 5201 [ 4] local 172.17.0.1 port 40378 connected to 172.17.0.2 port 5201 [ ID] Interval Transfer Bandwidth Retr Cwnd [ 4] 0.00-1.00 sec 1.15 GBytes 9.89 Gbits/sec 0 1.02 MBytes [ 4] 1.00-2.00 sec 1.18 GBytes 10.2 Gbits/sec 0 1.02 MBytes [ 4] 2.00-3.00 sec 965 MBytes 8.09 Gbits/sec 0 1.02 MBytes [ 4] 3.00-4.00 sec 942 MBytes 7.90 Gbits/sec 0 1.02 MBytes [ 4] 4.00-5.00 sec 952 MBytes 7.99 Gbits/sec 0 1.02 MBytes [ 4] 5.00-6.00 sec 1.14 GBytes 9.81 Gbits/sec 0 1.02 MBytes [ 4] 6.00-7.00 sec 1.13 GBytes 9.68 Gbits/sec 0 1.02 MBytes [ 4] 7.00-8.00 sec 930 MBytes 7.80 Gbits/sec 0 1.02 MBytes [ 4] 8.00-9.00 sec 1.15 GBytes 9.91 Gbits/sec 0 1.02 MBytes [ 4] 9.00-10.00 sec 938 MBytes 7.87 Gbits/sec 0 1.02 MBytes [ 4] 10.00-11.00 sec 737 MBytes 6.18 Gbits/sec 0 1.02 MBytes [ 4] 11.00-12.00 sec 1.16 GBytes 9.93 Gbits/sec 0 1.02 MBytes [ 4] 12.00-13.00 sec 917 MBytes 7.69 Gbits/sec 0 1.02 MBytes [ 4] 13.00-14.00 sec 1.19 GBytes 10.2 Gbits/sec 0 1.02 MBytes [ 4] 14.00-15.00 sec 1.01 GBytes 8.70 Gbits/sec 0 1.02 MBytes [ 4] 15.00-16.00 sec 1.20 GBytes 10.3 Gbits/sec 0 1.02 MBytes [ 4] 16.00-17.00 sec 1.14 GBytes 9.80 Gbits/sec 0 1.02 MBytes ^C[ 4] 17.00-17.60 sec 718 MBytes 10.1 Gbits/sec 0 1.02 MBytes - - - - - - - - - - - - - - - - - - - - - - - - - [ ID] Interval Transfer Bandwidth Retr [ 4] 0.00-17.60 sec 18.4 GBytes 8.98 Gbits/sec 0 sender [ 4] 0.00-17.60 sec 0.00 Bytes 0.00 bits/sec receiver PiperOrigin-RevId: 245470590 Change-Id: I1c08c5ee8345de6ac070513656a4703312dc3c00
2019-04-23Fixes to PacketMMap dispatcher.Bhasker Hariharan
This CL fixes the following bugs: - Uses atomic to set/read status instead of binary.LittleEndian.PutUint32 etc which are not atomic. - Increments ringOffsets for frames that are truncated (i.e status is tpStatusCopy) - Does not ignore frames with tpStatusLost bit set as they are valid frames and only indicate that there some frames were lost before this one and metrics can be retrieved with a getsockopt call. - Adds checks to make sure blockSize is a multiple of page size. This is required as the kernel allocates in pages per block and rejects sizes that are not page aligned with an EINVAL. Updates #210 PiperOrigin-RevId: 244959464 Change-Id: I5d61337b7e4c0f8a3063dcfc07791d4c4521ba1f
2019-04-19tcpip/transport/tcp: read side only shutdown of an endpointBen Burkert
Support shutdown on only the read side of an endpoint. Reads performed after a call to Shutdown with only the ShutdownRead flag will return ErrClosedForReceive without data. Break out the shutdown(2) with SHUT_RD syscall test into to two tests. The first tests that no packets are sent when shutting down the read side of a socket. The second tests that, after shutting down the read side of a socket, unread data can still be read, or an EOF if there is no more data to read. Change-Id: I9d7c0a06937909cbb466b7591544a4bcaebb11ce PiperOrigin-RevId: 244459430
2019-04-18tcpip/transport/udp: add Forwarder typeBen Burkert
Add a UDP forwarder for intercepting and forwarding UDP sessions. Change-Id: I2d83c900c1931adfc59a532dd4f6b33a0db406c9 PiperOrigin-RevId: 244293576
2019-04-18netstack: use a proper network protocol to set gso.L3HdrLenAndrei Vagin
It is possible to create a listening socket which will accept IPv4 and IPv6 connections. In this case, we set IPv6ProtocolNumber for all accepted endpoints, even if they handle IPv4 connections. This means that we can't use endpoint.netProto to set gso.L3HdrLen. PiperOrigin-RevId: 244227948 Change-Id: I5e1863596cb9f3d216febacdb7dc75651882eef1
2019-04-17Return error from fdbased.NewFabricio Voznika
RELNOTES: n/a PiperOrigin-RevId: 244031742 Change-Id: Id0cdb73194018fb5979e67b58510ead19b5a2b81
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
2019-03-29Fix incorrect checksums in TCP and UDP tests.Bhasker Hariharan
PiperOrigin-RevId: 241025361 Change-Id: I292e7aea9a4b294b11e4f736e107010d9524586b
2019-03-28Fix Panic in SACKScoreboard.Delete.Bhasker Hariharan
The panic was caused by modifying the tree while iterating which invalidated the iterator. Also fixes another bug in SACKScoreboard.Insert() which was causing blocks to be merged incorrectly. PiperOrigin-RevId: 240895053 Change-Id: Ia72b8244297962df5c04283346da5226434740af
2019-03-28Add ICMP statsBert Muthalaly
PiperOrigin-RevId: 240848882 Change-Id: I23dd4599f073263437aeab357c3f767e1a432b82
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
2019-03-27Avoid mutating memory passed to DeliverTransportPacketTamir Duberstein
PiperOrigin-RevId: 240642903 Change-Id: I16625015123a827d267d60b328a202057264bbd6
2019-03-26Remove polling from ICMP testTamir Duberstein
PiperOrigin-RevId: 240483396 Change-Id: Ie75d3ae38af83f1d92f167ff9ba58fa10f5b372b
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
2019-03-26Remove echoReplierTamir Duberstein
Mirror the ICMPv6 echo implementation in ICMPv4 echo. This removes unnecessary asynchrony, reduces copying, and reduces complexity. PiperOrigin-RevId: 240394525 Change-Id: If8f53254154f86772f5e51159765aa23b3b328b8
2019-03-20netstack: adjust the sequence number after trimming the packetAndrei Vagin
PiperOrigin-RevId: 239417224 Change-Id: I14a9adc31a6330a79a6156c105969cd5f1f63d20
2019-03-19netstack: reduce MSS from SYN to account tcp optionsAndrei Vagin
See: https://tools.ietf.org/html/rfc6691#section-2 PiperOrigin-RevId: 239305632 Change-Id: Ie8eb912a43332e6490045dc95570709c5b81855e
2019-03-19Add layer 2 stats (tx, rx) X (packets, bytes) to netstackBert Muthalaly
PiperOrigin-RevId: 239194420 Change-Id: Ie193e8ac2b7a6db21195ac85824a335930483971
2019-03-14Remove duplicate TCP flag definitionsTamir Duberstein
PiperOrigin-RevId: 238467634 Change-Id: If4cd8efff7386fbee1195f051d15549b495910a9
2019-03-13Remove unused function.Kevin Krakauer
PiperOrigin-RevId: 238336475 Change-Id: I8131e04699028246ebc233953ebb3feca5673940
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