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2021-01-19Do not have a stack-wide linkAddressCacheGhanan Gowripalan
Link addresses are cached on a per NIC basis so instead of having a single cache that includes the NIC ID for neighbor entry lookups, use a single cache per NIC. PiperOrigin-RevId: 352684111
2021-01-19Per NIC NetworkEndpoint statisticsArthur Sfez
To facilitate the debugging of multi-homed setup, track Network protocols statistics for each endpoint. Note that the original stack-wide stats still exist. A new type of statistic counter is introduced, which track two versions of a stat at the same time. This lets a network endpoint increment both the local stat and the stack-wide stat at the same time. Fixes #4605 PiperOrigin-RevId: 352663276
2021-01-19Drop CheckLocalAddress from LinkAddressCacheGhanan Gowripalan
PiperOrigin-RevId: 352623277
2021-01-17Do not use a stack-wide queue of pending packetsGhanan Gowripalan
Packets may be pending on link resolution to complete before being sent. Link resolution is performed for neighbors which are unique to a NIC so hold link resolution related state under the NIC, not the stack. Note, this change may result in more queued packets but that is okay as RFC 4861 section 7.2.2 recommends that the stack maintain a queue of packets for each neighbor that is waiting for link resolution to complete, not a fixed limit per stack. PiperOrigin-RevId: 352322155
2021-01-15Resolve known link address on route creationGhanan Gowripalan
If a Route is being created through a link that requires link address resolution and a remote address that has a known mapping to a link address, populate the link address when the route is created. This removes the need for neighbor/link address caches to perform this check. Fixes #5149 PiperOrigin-RevId: 352122401
2021-01-15Support GetLinkAddress with neighborCacheGhanan Gowripalan
Test: integration_test.TestGetLinkAddress PiperOrigin-RevId: 352119404
2021-01-15Only pass stack.Route's fields to LinkEndpointsGhanan Gowripalan
stack.Route is used to send network packets and resolve link addresses. A LinkEndpoint does not need to do either of these and only needs the route's fields at the time of the packet write request. Since LinkEndpoints only need the route's fields when writing packets, pass a stack.RouteInfo instead. PiperOrigin-RevId: 352108405
2021-01-15Remove count argument from tcpip.Endpoint.ReadTamir Duberstein
The same intent can be specified via the io.Writer. PiperOrigin-RevId: 352098747
2021-01-15[rack] Retransmit the probe segment after the probe timer expires.Ayush Ranjan
This change implements TLP details enumerated in https://tools.ietf.org/html/draft-ietf-tcpm-rack-08#section-7.5.2. Fixes #5084 PiperOrigin-RevId: 352093473
2021-01-15Correctly return EMSGSIZE when packet is too big in raw socket.Ting-Yu Wang
IPv4 previously accepts the packet, while IPv6 panics. Neither is the behavior in Linux. splice() in Linux has different behavior than in gVisor. This change documents it in the SpliceTooLong test. Reported-by: syzbot+b550e78e5c24d1d521f2@syzkaller.appspotmail.com PiperOrigin-RevId: 352091286
2021-01-15Populate EgressRoute, GSO, Netproto for batch writesGhanan Gowripalan
We loop over the list of packets anyways so setting these aren't expensive. Now that they are populated only by the link endpoint that uses them, TCP does not need to. PiperOrigin-RevId: 352090853
2021-01-15Add sanity check on return values from WriteTing-Yu Wang
io.Writer.Write requires err to be non-nil if n < len(v). We could allow this but it will be irreversible if users depend on this behavior. Ported the test that discovered this. PiperOrigin-RevId: 352065946
2021-01-14Add stats for ARPArthur Sfez
Fixes #4963 Startblock: has LGTM from sbalana and then add reviewer ghanan PiperOrigin-RevId: 351886320
2021-01-14Remove impossible errorsTamir Duberstein
Commit 25b5ec7 moved link address resolution out of the transport layer; special handling of link address resolution is no longer necessary in tcp. PiperOrigin-RevId: 351839254
2021-01-13Clear neighbor table on NIC downGhanan Gowripalan
Note, this includes static entries to match linux's behaviour. ``` $ ip neigh show dev eth0 192.168.42.1 lladdr fc:ec:da:70:6e:f9 STALE $ sudo ip neigh add 192.168.42.172 lladdr 22:33:44:55:66:77 dev eth0 $ ip neigh show dev eth0 192.168.42.1 lladdr fc:ec:da:70:6e:f9 STALE 192.168.42.172 lladdr 22:33:44:55:66:77 PERMANENT $ sudo ifconfig eth0 down $ ip neigh show dev eth0 $ sudo ifconfig eth0 up $ ip neigh show dev eth0 ``` Test: stack_test.TestClearNeighborCacheOnNICDisable PiperOrigin-RevId: 351696306
2021-01-13Do not resolve remote link address at transport layerGhanan Gowripalan
Link address resolution is performed at the link layer (if required) so we can defer it from the transport layer. When link resolution is required, packets will be queued and sent once link resolution completes. If link resolution fails, the transport layer will receive a control message indicating that the stack failed to route the packet. tcpip.Endpoint.Write no longer returns a channel now that writes do not wait for link resolution at the transport layer. tcpip.ErrNoLinkAddress is no longer used so it is removed. Removed calls to stack.Route.ResolveWith from the transport layer so that link resolution is performed when a route is created in response to an incoming packet (e.g. to complete TCP handshakes or send a RST). Tests: - integration_test.TestForwarding - integration_test.TestTCPLinkResolutionFailure Fixes #4458 RELNOTES: n/a PiperOrigin-RevId: 351684158
2021-01-13Switch uses of os.Getenv that check for empty string to os.LookupEnv.Dean Deng
Whether the variable was found is already returned by syscall.Getenv. os.Getenv drops this value while os.Lookupenv passes it along. PiperOrigin-RevId: 351674032
2021-01-13Clean up the dummy network interface used by UDP testsArthur Sfez
It is now composed by a NetworkInterface interface which lets us delete the methods we don't need. PiperOrigin-RevId: 351613267
2021-01-13[rack] TLP: Recovery detection.Ayush Ranjan
This change implements TLP details enumerated in https://tools.ietf.org/html/draft-ietf-tcpm-rack-08#section-7.6 Fixes #5131 PiperOrigin-RevId: 351558449
2021-01-12Drop TransportEndpointID from HandleControlPacketGhanan Gowripalan
When a control packet is delivered, it is delivered to a transport endpoint with a matching stack.TransportEndpointID so there is no need to pass the ID to the endpoint as it already knows its ID. PiperOrigin-RevId: 351497588
2021-01-12Remove unnecessary closureTamir Duberstein
PiperOrigin-RevId: 351491836
2021-01-12[rack] Set up TLP timer and configure timeout.Ayush Ranjan
This change implements TLP details enumerated in https://tools.ietf.org/html/draft-ietf-tcpm-rack-08#section-7.5.1. Fixes #5083 PiperOrigin-RevId: 351467357
2021-01-12Fix simple mistakes identified by goreportcard.Adin Scannell
These are primarily simplification and lint mistakes. However, minor fixes are also included and tests added where appropriate. PiperOrigin-RevId: 351425971
2021-01-07netstack: Refactor tcpip.Endpoint.ReadTing-Yu Wang
Read now takes a destination io.Writer, count, options. Keeping the method name Read, in contrast to the Write method. This enables: * direct transfer of views under VV * zero copy It also eliminates the need for sentry to keep a slice of view because userspace had requested a read that is smaller than the view returned, removing the complexity there. Read/Peek/ReadPacket are now consolidated together and some duplicate code is removed. PiperOrigin-RevId: 350636322
2021-01-06Do not filter frames in ethernet link endpointGhanan Gowripalan
Ethernet frames are usually filtered at the hardware-level so there is no need to filter the frames in software. For test purposes, a new link endpoint was introduced to filter frames based on their destination. PiperOrigin-RevId: 350422941
2021-01-06Support add/remove IPv6 multicast group sock optGhanan Gowripalan
IPv4 was always supported but UDP never supported joining/leaving IPv6 multicast groups via socket options. Add: IPPROTO_IPV6, IPV6_JOIN_GROUP/IPV6_ADD_MEMBERSHIP Remove: IPPROTO_IPV6, IPV6_LEAVE_GROUP/IPV6_DROP_MEMBERSHIP Test: integration_test.TestUDPAddRemoveMembershipSocketOption PiperOrigin-RevId: 350396072
2020-12-22Move SO_BINDTODEVICE to socketops.Nayana Bidari
PiperOrigin-RevId: 348696094
2020-12-22Correctly log sniffed ARP packetsTamir Duberstein
This condition was inverted in 360006d. PiperOrigin-RevId: 348679088
2020-12-22Invoke address resolution upon subsequent traffic to Failed neighborPeter Johnston
Removes the period of time in which subseqeuent traffic to a Failed neighbor immediately fails with ErrNoLinkAddress. A Failed neighbor is one in which address resolution fails; or in other words, the neighbor's IP address cannot be translated to a MAC address. This means removing the Failed state for linkAddrCache and allowing transitiong out of Failed into Incomplete for neighborCache. Previously, both caches would transition entries to Failed after address resolution fails. In this state, any subsequent traffic requested within an unreachable time would immediately fail with ErrNoLinkAddress. This does not follow RFC 4861 section 7.3.3: If address resolution fails, the entry SHOULD be deleted, so that subsequent traffic to that neighbor invokes the next-hop determination procedure again. Invoking next-hop determination at this point ensures that alternate default routers are tried. The API for getting a link address for a given address, whether through the link address cache or the neighbor table, is updated to optionally take a callback which will be called when address resolution completes. This allows `Route` to handle completing link resolution internally, so callers of (*Route).Resolve (e.g. endpoints) don’t have to keep track of when it completes and update the Route accordingly. This change also removes the wakers from LinkAddressCache, NeighborCache, and Route in favor of the callbacks, and callers that previously used a waker can now just pass a callback to (*Route).Resolve that will notify the waker on resolution completion. Fixes #4796 Startblock: has LGTM from sbalana and then add reviewer ghanan PiperOrigin-RevId: 348597478
2020-12-21Prefer matching labels and longest matching prefixGhanan Gowripalan
...when performing source address selection for IPv6. These are defined in RFC 6724 section 5 rule 6 (prefer matching label) and rule 8 (use longest matching prefix). This change also considers ULA of global scope instead of its own scope, as per RFC 6724 section 3.1: Also, note that ULAs are considered as global, not site-local, scope but are handled via the prefix policy table as discussed in Section 10.6. Test: stack_test.TestIPv6SourceAddressSelectionScope Startblock: has LGTM from peterjohnston and then add reviewer brunodalbo PiperOrigin-RevId: 348580996
2020-12-21Don't modify a packet header when it can be used by other endpointsAndrei Vagin
Reported-by: syzbot+48c43f82fe7738fceae9@syzkaller.appspotmail.com PiperOrigin-RevId: 348540796
2020-12-21RLock Endpoint in raw.Endpoint.HandlePacketKevin Krakauer
PiperOrigin-RevId: 348530530
2020-12-17[netstack] Implement IP(V6)_RECVERR socket option.Ayush Ranjan
PiperOrigin-RevId: 348055514
2020-12-17[netstack] Implement MSG_ERRQUEUE flag for recvmsg(2).Ayush Ranjan
Introduces the per-socket error queue and the necessary cmsg mechanisms. PiperOrigin-RevId: 348028508
2020-12-17Remove duplicate `return`Tamir Duberstein
PiperOrigin-RevId: 347974624
2020-12-16Cleanup locking in multicast group protocol testsGhanan Gowripalan
Startblock: has LGTM from asfez and then add reviewer tamird PiperOrigin-RevId: 347928471
2020-12-16Automated rollback of changelist 346565589gVisor bot
PiperOrigin-RevId: 347911316
2020-12-16Add support to count the number of packets SACKed.Nayana Bidari
sacked_out is required in RACK to check the number of duplicate acknowledgements during updating the reorder window. If there is no reordering and the value for sacked_out is greater than the classic threshold value 3, then reorder window is set to zero. It is calculated by counting the number of segments sacked in the ACK and is reduced when a cumulative ACK is received which covers the SACK blocks. This value is set to zero when the connection enters recovery. PiperOrigin-RevId: 347872246
2020-12-16Ensure correctness of saved receive windowMithun Iyer
When the scaled receive window size > 65535 (max uint16), we advertise the scaled value as 65535, but are not adjusting the saved receive window value when doing so. This would keep our current window calculation logic to be incorrect, as the saved receive window value is different from what was advertised. Fixes #4903 PiperOrigin-RevId: 347771340
2020-12-15Validate router alert's data lengthGhanan Gowripalan
RFC 2711 specifies that the router alert's length field is always 2 so we should make sure only 2 bytes are read from a router alert option's data field. Test: header.TestIPv6OptionsExtHdrIterErr PiperOrigin-RevId: 347727876
2020-12-15Don't split enabled flag across multicast group stateGhanan Gowripalan
Startblock: has LGTM from asfez and then add reviewer brunodalbo PiperOrigin-RevId: 347716242
2020-12-15Fix error code for connect in raw sockets.Nayana Bidari
PiperOrigin-RevId: 347650354
2020-12-15Fix a data race in packetEPsTing-Yu Wang
packetEPs may get into a state that `len < cap`, casuing append() modifying the original slice storage. Reported-by: syzbot+978dd0e9c2600ab7a76b@syzkaller.appspotmail.com PiperOrigin-RevId: 347634351
2020-12-14Move SO_LINGER option to socketops.Nayana Bidari
PiperOrigin-RevId: 347437786
2020-12-14Move SO_ERROR and SO_OOBINLINE option to socketops.Nayana Bidari
SO_OOBINLINE option is set/get as boolean value, which is the same as linux. As we currently do not support disabling this option, we always return it as true. PiperOrigin-RevId: 347413905
2020-12-12Reduce the memory overhead in IP fragment managementToshi Kikuchi
- Deep-copy pkt.Data and hold it instead of shallow-copy (vv.Clone). This allows the pkt's backing array, which includes the header portion, to be freed. - Remove fragHeap. The fragments are now held in holes struct instead. - Stop reserving the initial capacity of holes slice. PiperOrigin-RevId: 347198744
2020-12-12Introduce IPv6 extension header serialization facilitiesBruno Dal Bo
Adds IPv6 extension header serializer and Hop by Hop options serializer. Add RouterAlert option serializer and use it in MLD. Fixed #4996 Startblock: has LGTM from marinaciocea and then add reviewer ghanan PiperOrigin-RevId: 347174537
2020-12-11Fix panic when IPv4 address is used in sendmsg for IPv6 socketsNayana Bidari
We do not rely on error for getsockopt options(which have boolean values) anymore. This will cause issue in sendmsg where we used to return error for IPV6_V6Only option. Fix the panic by returning error (for sockets other than TCP and UDP) if the address does not match the type(AF_INET/AF_INET6) of the socket. PiperOrigin-RevId: 347063838
2020-12-11[netstack] Decouple tcpip.ControlMessages from the IP control messges.Ayush Ranjan
tcpip.ControlMessages can not contain Linux specific structures which makes it painful to convert back and forth from Linux to tcpip back to Linux when passing around control messages in hostinet and raw sockets. Now we convert to the Linux version of the control message as soon as we are out of tcpip. PiperOrigin-RevId: 347027065
2020-12-10Disable host reassembly for fragments.Bhasker Hariharan
fdbased endpoint was enabling fragment reassembly on the host AF_PACKET socket to ensure that fragments are delivered inorder to the right dispatcher. But this prevents fragments from being delivered to gvisor at all and makes testing of gvisor's fragment reassembly code impossible. The potential impact from this is minimal since IP Fragmentation is not really that prevelant and in cases where we do get fragments we may deliver the fragment out of order to the TCP layer as multiple network dispatchers may process the fragments and deliver a reassembled fragment after the next packet has been delivered to the TCP endpoint. While not desirable I believe the impact from this is minimal due to low prevalence of fragmentation. Also removed PktType and Hatype fields when binding the socket as these are not used when binding. Its just confusing to have them specified. See: https://man7.org/linux/man-pages/man7/packet.7.html "Fields used for binding are sll_family (should be AF_PACKET), sll_protocol, and sll_ifindex." Fixes #5055 PiperOrigin-RevId: 346919439
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