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2020-09-24Merge release-20200914.0-151-g5d50c91c4 (automated)gVisor bot
2020-09-24Change segment/pending queue to use receive buffer limits.Bhasker Hariharan
segment_queue today has its own standalone limit of MaxUnprocessedSegments but this can be a problem in UnlockUser() we do not release the lock till there are segments to be processed. What can happen is as handleSegments dequeues packets more keep getting queued and we will never release the lock. This can keep happening even if the receive buffer is full because nothing can read() till we release the lock. Further having a separate limit for pending segments makes it harder to track memory usage etc. Unifying the limits makes it easier to reason about memory in use and makes the overall buffer behaviour more consistent. PiperOrigin-RevId: 333508122
2020-09-23Merge release-20200914.0-137-g99decaadd (automated)gVisor bot
2020-09-23Extract ICMP error sender from UDPJulian Elischer
Store transport protocol number on packet buffers for use in ICMP error generation. Updates #2211. PiperOrigin-RevId: 333252762
2020-09-18Merge release-20200907.0-142-gfcf8d7c6d (automated)gVisor bot
2020-09-18Enqueue TCP sends arriving in SYN_SENT state.Mithun Iyer
TCP needs to enqueue any send requests arriving when the connection is in SYN_SENT state. The data should be sent out soon after completion of the connection handshake. Fixes #3995 PiperOrigin-RevId: 332482041
2020-09-18Merge release-20200907.0-138-g360006d89 (automated)gVisor bot
2020-09-18Use common parsing utilities when sniffingGhanan Gowripalan
Extract parsing utilities so they can be used by the sniffer. Fixes #3930 PiperOrigin-RevId: 332401880
2020-09-18Merge release-20200907.0-134-gd34bda027 (automated)gVisor bot
2020-09-17{Set,Get} SO_LINGER on all endpoints.Nayana Bidari
SO_LINGER is a socket level option and should be stored on all endpoints even though it is used to linger only for TCP endpoints. PiperOrigin-RevId: 332369252
2020-09-16Merge release-20200907.0-67-gb6d165fe9 (automated)gVisor bot
2020-09-16Automated rollback of changelist 329526153Nayana Bidari
PiperOrigin-RevId: 332097286
2020-09-16Receive broadcast packets on interested endpointsGhanan Gowripalan
When a broadcast packet is received by the stack, the packet should be delivered to each endpoint that may be interested in the packet. This includes all any address and specified broadcast address listeners. Test: integration_test.TestReuseAddrAndBroadcast PiperOrigin-RevId: 332060652
2020-09-15Don't conclude broadcast from route destinationGhanan Gowripalan
The routing table (in its current) form should not be used to make decisions about whether a remote address is a broadcast address or not (for IPv4). Note, a destination subnet does not always map to a network. E.g. RouterA may have a route to 192.168.0.0/22 through RouterB, but RouterB may be configured with 4x /24 subnets on 4 different interfaces. See https://github.com/google/gvisor/issues/3938. PiperOrigin-RevId: 331819868
2020-09-14Merge release-20200907.0-42-g2747030ec (automated)gVisor bot
2020-09-14Store multicast memberships in a setTamir Duberstein
This is simpler and more performant. PiperOrigin-RevId: 331639978
2020-09-14Merge release-20200907.0-41-g05d2ebee5 (automated)gVisor bot
2020-09-14Test RST handling in TIME_WAIT.Mithun Iyer
gVisor stack ignores RSTs when in TIME_WAIT which is not the default Linux behavior. Add a packetimpact test to test the same. Also update code comments to reflect the rationale for the current gVisor behavior. PiperOrigin-RevId: 331629879
2020-09-08Merge release-20200818.0-128-g38cdb0579 (automated)gVisor bot
2020-09-08Fix data race in tcp.GetSockOpt.Bhasker Hariharan
e.ID can't be read without holding e.mu. GetSockOpt was reading e.ID when looking up OriginalDst without holding e.mu. PiperOrigin-RevId: 330562293
2020-09-08Merge release-20200818.0-127-gd35f07b36 (automated)gVisor bot
2020-09-08Improve type safety for transport protocol optionsGhanan Gowripalan
The existing implementation for TransportProtocol.{Set}Option take arguments of an empty interface type which all types (implicitly) implement; any type may be passed to the functions. This change introduces marker interfaces for transport protocol options that may be set or queried which transport protocol option types implement to ensure that invalid types are caught at compile time. Different interfaces are used to allow the compiler to enforce read-only or set-only socket options. RELNOTES: n/a PiperOrigin-RevId: 330559811
2020-09-03Merge release-20200818.0-115-gb69352245 (automated)gVisor bot
2020-09-02Fix Accept to not return error for sockets in accept queue.Bhasker Hariharan
Accept on gVisor will return an error if a socket in the accept queue was closed before Accept() was called. Linux will return the new fd even if the returned socket is already closed by the peer say due to a RST being sent by the peer. This seems to be intentional in linux more details on the github issue. Fixes #3780 PiperOrigin-RevId: 329828404
2020-09-02Merge release-20200818.0-104-g40faeaa18 (automated)gVisor bot
2020-09-01Fix handling of unacceptable ACKs during close.Mithun Iyer
On receiving an ACK with unacceptable ACK number, in a closing state, TCP, needs to reply back with an ACK with correct seq and ack numbers and remain in same state. This change is as per RFC793 page 37, but with a difference that it does not apply to ESTABLISHED state, just as in Linux. Also add more tests to check for OTW sequence number and unacceptable ack numbers in these states. Fixes #3785 PiperOrigin-RevId: 329616283
2020-09-01Merge release-20200818.0-98-g0eae08bc9 (automated)gVisor bot
2020-09-01Automated rollback of changelist 328350576Nayana Bidari
PiperOrigin-RevId: 329526153
2020-08-27Merge release-20200818.0-74-g6f8fb7e0d (automated)gVisor bot
2020-08-27Improve type safety for socket optionsGhanan Gowripalan
The existing implementation for {G,S}etSockOpt take arguments of an empty interface type which all types (implicitly) implement; any type may be passed to the functions. This change introduces marker interfaces for socket options that may be set or queried which socket option types implement to ensure that invalid types are caught at compile time. Different interfaces are used to allow the compiler to enforce read-only or set-only socket options. Fixes #3714. RELNOTES: n/a PiperOrigin-RevId: 328832161
2020-08-27Merge release-20200818.0-69-gdc81eb9c3 (automated)gVisor bot
2020-08-27Add function to get error from a tcpip.EndpointGhanan Gowripalan
In an upcoming CL, socket option types are made to implement a marker interface with pointer receivers. Since this results in calling methods of an interface with a pointer, we incur an allocation when attempting to get an Endpoint's last error with the current implementation. When calling the method of an interface, the compiler is unable to determine what the interface implementation does with the pointer (since calling a method on an interface uses virtual dispatch at runtime so the compiler does not know what the interface method will do) so it allocates on the heap to be safe incase an implementation continues to hold the pointer after the functioon returns (the reference escapes the scope of the object). In the example below, the compiler does not know what b.foo does with the reference to a it allocates a on the heap as the reference to a may escape the scope of a. ``` var a int var b someInterface b.foo(&a) ``` This change removes the opportunity for that allocation. RELNOTES: n/a PiperOrigin-RevId: 328796559
2020-08-25Merge release-20200818.0-53-g70a7a3ac7 (automated)gVisor bot
2020-08-25Only send an ICMP error message if UDP checksum is valid.Toshi Kikuchi
Test: - TestV4UnknownDestination - TestV6UnknownDestination PiperOrigin-RevId: 328424137
2020-08-25Add option to replace linkAddrCache with neighborCacheSam Balana
This change adds an option to replace the current implementation of ARP through linkAddrCache, with an implementation of NUD through neighborCache. Switching to using NUD for both ARP and NDP is beneficial for the reasons described by RFC 4861 Section 3.1: "[Using NUD] significantly improves the robustness of packet delivery in the presence of failing routers, partially failing or partitioned links, or nodes that change their link-layer addresses. For instance, mobile nodes can move off-link without losing any connectivity due to stale ARP caches." "Unlike ARP, Neighbor Unreachability Detection detects half-link failures and avoids sending traffic to neighbors with which two-way connectivity is absent." Along with these changes exposes the API for querying and operating the neighbor cache. Operations include: - Create a static entry - List all entries - Delete all entries - Remove an entry by address This also exposes the API to change the NUD protocol constants on a per-NIC basis to allow Neighbor Discovery to operate over links with widely varying performance characteristics. See [RFC 4861 Section 10][1] for the list of constants. Finally, an API for subscribing to NUD state changes is exposed through NUDDispatcher. See [RFC 4861 Appendix C][3] for the list of edges. Tests: pkg/tcpip/network/arp:arp_test + TestDirectRequest pkg/tcpip/network/ipv6:ipv6_test + TestLinkResolution + TestNDPValidation + TestNeighorAdvertisementWithTargetLinkLayerOption + TestNeighorSolicitationResponse + TestNeighorSolicitationWithSourceLinkLayerOption + TestRouterAdvertValidation pkg/tcpip/stack:stack_test + TestCacheWaker + TestForwardingWithFakeResolver + TestForwardingWithFakeResolverManyPackets + TestForwardingWithFakeResolverManyResolutions + TestForwardingWithFakeResolverPartialTimeout + TestForwardingWithFakeResolverTwoPackets + TestIPv6SourceAddressSelectionScopeAndSameAddress [1]: https://tools.ietf.org/html/rfc4861#section-10 [2]: https://tools.ietf.org/html/rfc4861#appendix-C Fixes #1889 Fixes #1894 Fixes #1895 Fixes #1947 Fixes #1948 Fixes #1949 Fixes #1950 PiperOrigin-RevId: 328365034
2020-08-25Merge release-20200818.0-42-gb26f7503b (automated)gVisor bot
2020-08-25Support SO_LINGER socket option.Nayana Bidari
When SO_LINGER option is enabled, the close will not return until all the queued messages are sent and acknowledged for the socket or linger timeout is reached. If the option is not set, close will return immediately. This option is mainly supported for connection oriented protocols such as TCP. PiperOrigin-RevId: 328350576
2020-08-25Merge release-20200818.0-39-gae332d96e (automated)gVisor bot
2020-08-25Fix TCP_LINGER2 behavior to match linux.Bhasker Hariharan
We still deviate a bit from linux in how long we will actually wait in FIN-WAIT-2. Linux seems to cap it with TIME_WAIT_LEN and it's not completely obvious as to why it's done that way. For now I think we can ignore that and fix it if it really is an issue. PiperOrigin-RevId: 328324922
2020-08-25Merge release-20200818.0-37-gf1821fdb6 (automated)gVisor bot
2020-08-24Automated rollback of changelist 327325153Ghanan Gowripalan
PiperOrigin-RevId: 328259353
2020-08-20Merge release-20200810.0-73-gf12b545d8 (automated)gVisor bot
2020-08-20Skip listening TCP ports when trying to bind a free port.Bhasker Hariharan
PiperOrigin-RevId: 327686558
2020-08-18Merge release-20200810.0-53-g4184a7d5f (automated)gVisor bot
2020-08-18RACK: Create a new list for segments.Nayana Bidari
RACK requires the segments to be in the order of their transmission or retransmission times. This cl creates a new list and moves the retransmitted segments to the end of the list. PiperOrigin-RevId: 327325153
2020-08-14Use a single NetworkEndpoint per NIC per protocolGhanan Gowripalan
The NetworkEndpoint does not need to be created for each address. Most of the work the NetworkEndpoint does is address agnostic. PiperOrigin-RevId: 326759605
2020-08-14Give the ICMP Code its own typeJulian Elischer
This is a preparatory commit for a larger commit working on ICMP generation in error cases. This is removal of technical debt and cleanup in the gvisor code as part of gvisor issue 2211. Updates #2211. PiperOrigin-RevId: 326615389
2020-08-14Merge release-20200810.0-27-gd3bb50ebf (automated)gVisor bot
2020-08-13Use the user supplied MSS for accepted connectionsGhanan Gowripalan
This change supports using the user supplied MSS (TCP_MAXSEG socket option) for new socket connections created from a listening TCP socket. Note that the user supplied MSS will only be used if it is not greater than the maximum possible MSS for a TCP connection's route. If it is greater than the maximum possible MSS, the MSS will be capped at that maximum value. Test: tcp_test.TestUserSuppliedMSSOnListenAccept PiperOrigin-RevId: 326567442
2020-08-13Merge release-20200810.0-23-g47515f475 (automated)gVisor bot
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