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2020-08-20Consistent precondition formattingMichael Pratt
Our "Preconditions:" blocks are very useful to determine the input invariants, but they are bit inconsistent throughout the codebase, which makes them harder to read (particularly cases with 5+ conditions in a single paragraph). I've reformatted all of the cases to fit in simple rules: 1. Cases with a single condition are placed on a single line. 2. Cases with multiple conditions are placed in a bulleted list. This format has been added to the style guide. I've also mentioned "Postconditions:", though those are much less frequently used, and all uses already match this style. PiperOrigin-RevId: 327687465
2020-08-20Skip listening TCP ports when trying to bind a free port.Bhasker Hariharan
PiperOrigin-RevId: 327686558
2020-08-20Only use the NextHeader value of the first IPv6 fragment extension header.Arthur Sfez
As per RFC 8200 Section 4.5: The Next Header field of the last header of the Per-Fragment headers is obtained from the Next Header field of the first fragment's Fragment header. Test: - pkg/tcpip/network/ipv6:ipv6_test - pkg/tcpip/network/ipv4:ipv4_test - pkg/tcpip/network/fragmentation:fragmentation_test Updates #2197 PiperOrigin-RevId: 327671635
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
2020-08-17Remove address range functionsGhanan Gowripalan
Should have been removed in cl/326791119 https://github.com/google/gvisor/commit/9a7b5830aa063895f67ca0fdf653a46906374613 PiperOrigin-RevId: 327074156
2020-08-17Add a unit test for out of order IP reassemblyArthur Sfez
PiperOrigin-RevId: 327042869
2020-08-15Don't support address rangesGhanan Gowripalan
Previously the netstack supported assignment of a range of addresses. This feature is not used so remove it. PiperOrigin-RevId: 326791119
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
2020-08-13Use 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
2020-08-13Migrate to PacketHeader API for PacketBuffer.Ting-Yu Wang
Formerly, when a packet is constructed or parsed, all headers are set by the client code. This almost always involved prepending to pk.Header buffer or trimming pk.Data portion. This is known to prone to bugs, due to the complexity and number of the invariants assumed across netstack to maintain. In the new PacketHeader API, client will call Push()/Consume() method to construct/parse an outgoing/incoming packet. All invariants, such as slicing and trimming, are maintained by the API itself. NewPacketBuffer() is introduced to create new PacketBuffer. Zero value is no longer valid. PacketBuffer now assumes the packet is a concatenation of following portions: * LinkHeader * NetworkHeader * TransportHeader * Data Any of them could be empty, or zero-length. PiperOrigin-RevId: 326507688
2020-08-13Ensure TCP TIME-WAIT is not terminated prematurely.Bhasker Hariharan
Netstack's TIME-WAIT state for a TCP socket could be terminated prematurely if the socket entered TIME-WAIT using shutdown(..., SHUT_RDWR) and then was closed using close(). This fixes that bug and updates the tests to verify that Netstack correctly honors TIME-WAIT under such conditions. Fixes #3106 PiperOrigin-RevId: 326456443
2020-08-11Fix-up issue comment.Adin Scannell
PiperOrigin-RevId: 326129258
2020-08-10Set the NetworkProtocolNumber of all PacketBuffers.Kevin Krakauer
NetworkEndpoints set the number on outgoing packets in Write() and NetworkProtocols set them on incoming packets in Parse(). Needed for #3549. PiperOrigin-RevId: 325938745
2020-08-10Populate IPPacketInfo with destination addressGhanan Gowripalan
IPPacketInfo.DestinationAddr should hold the destination of the IP packet, not the source. This change fixes that bug. PiperOrigin-RevId: 325910766
2020-08-08Use unicast source for ICMP echo repliesGhanan Gowripalan
Packets MUST NOT use a non-unicast source address for ICMP Echo Replies. Test: integration_test.TestPingMulticastBroadcast PiperOrigin-RevId: 325634380
2020-08-07Fix panic during Address Resolution of neighbor entry created by NSSam Balana
When a Neighbor Solicitation is received, a neighbor entry is created with the remote host's link layer address, but without a link layer address resolver. If the host decides to send a packet addressed to the IP address of that neighbor entry, Address Resolution starts with a nil pointer to the link layer address resolver. This causes the netstack to panic and crash. This change ensures that when a packet is sent in that situation, the link layer address resolver will be set before Address Resolution begins. Tests: pkg/tcpip/stack:stack_test + TestEntryUnknownToStaleToProbeToReachable - TestNeighborCacheEntryNoLinkAddress Updates #1889 Updates #1894 Updates #1895 Updates #1947 Updates #1948 Updates #1949 Updates #1950 PiperOrigin-RevId: 325516471
2020-08-07tcp: change the limit of TCP_LINGER2Andrei Vagin
It was changed in the Linux kernel: commit f0628c524fd188c3f9418e12478dfdfadacba815 Date: Fri Apr 24 16:06:16 2020 +0800 net: Replace the limit of TCP_LINGER2 with TCP_FIN_TIMEOUT_MAX PiperOrigin-RevId: 325493859
2020-08-06Join IPv4 all-systems group on NIC enableGhanan Gowripalan
Test: - stack_test.TestJoinLeaveMulticastOnNICEnableDisable - integration_test.TestIncomingMulticastAndBroadcast PiperOrigin-RevId: 325185259
2020-08-05Add loss recovery option for TCP.Nayana Bidari
/proc/sys/net/ipv4/tcp_recovery is used to enable RACK loss recovery in TCP. PiperOrigin-RevId: 325157807
2020-08-05Support receiving broadcast IPv4 packetsGhanan Gowripalan
Test: integration_test.TestIncomingSubnetBroadcast PiperOrigin-RevId: 325135617
2020-08-05Prefer RLock over Lock in functions that don't need Lock().Bhasker Hariharan
Updates #231 PiperOrigin-RevId: 325097683
2020-08-04Update variables for implementation of RACK in TCPNayana Bidari
RACK (Recent Acknowledgement) is a new loss detection algorithm in TCP. These are the fields which should be stored on connections to implement RACK algorithm. PiperOrigin-RevId: 324948703
2020-08-04Use 1 fragmentation component per IP stackGhanan Gowripalan
This will help manage memory consumption by IP reassembly when receiving IP fragments on multiple network endpoints. Previously, each endpoint would cap memory consumption at 4MB, but with this change, each IP stack will cap memory consumption at 4MB. No behaviour changes. PiperOrigin-RevId: 324913904
2020-08-03Plumbing context.Context to DecRef() and Release().Nayana Bidari
context is passed to DecRef() and Release() which is needed for SO_LINGER implementation. PiperOrigin-RevId: 324672584
2020-07-31Support fragments from different sourcesGhanan Gowripalan
Prevent fragments with different source-destination pairs from conflicting with each other. Test: - ipv6_test.TestReceiveIPv6Fragments - ipv4_test.TestReceiveIPv6Fragments PiperOrigin-RevId: 324283246
2020-07-31iptables: support SO_ORIGINAL_DSTKevin Krakauer
Envoy (#170) uses this to get the original destination of redirected packets.
2020-07-30Fix TCP CurrentConnected counter updates.Mithun Iyer
CurrentConnected counter is incorrectly decremented on close of an endpoint which is still not connected. Fixes #3443 PiperOrigin-RevId: 324155171
2020-07-30Revert change to default buffer size.Bhasker Hariharan
In https://github.com/google/gvisor/commit/ca6bded95dbce07f9683904b4b768dfc2d4a09b2 we reduced the default buffer size to 32KB. This mostly works fine except at high throughput where we hit zero window very quickly and the TCP receive buffer moderation is not able to grow the window. This can be seen in the benchmarks where with a 32KB buffer and 100 connections downloading a 10MB file we get about 30 requests/s vs the 1MB buffer gives us about 53 requests/s. A proper fix requires a few changes to when we send a zero window as well as when we decide to send a zero window update. Today we consider available space below 1MSS as zero and send an update when it crosses 1MSS of available space. This is way too low and results in the window staying very small once we hit a zero window condition as we keep sending updates with size barely over 1MSS. Linux and BSD are smarter about this and use different thresholds. We should separately update our logic to match linux or BSD so that we don't send window updates that are really tiny or wait until we drop below 1MSS to advertise a zero window. PiperOrigin-RevId: 324087019
2020-07-30Enforce fragment block size and validate argsGhanan Gowripalan
Allow configuring fragmentation.Fragmentation with a fragment block size which will be enforced when processing fragments. Also validate arguments when processing fragments. Test: - fragmentation.TestErrors - ipv6_test.TestReceiveIPv6Fragments - ipv4_test.TestReceiveIPv6Fragments PiperOrigin-RevId: 324081521
2020-07-30Implement neighbor unreachability detection for ARP and NDP.Sam Balana
This change implements the Neighbor Unreachability Detection (NUD) state machine, as per RFC 4861 [1]. The state machine operates on a single neighbor in the local network. This requires the state machine to be implemented on each entry of the neighbor table. This change also adds, but does not expose, several APIs. The first API is for performing basic operations on the neighbor table: - Create a static entry - List all entries - Delete all entries - Remove an entry by address The second API is used for changing 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][2] for the list of constants. Finally, the last API is for allowing users to subscribe to NUD state changes. See [RFC 4861 Appendix C][3] for the list of edges. [1]: https://tools.ietf.org/html/rfc4861 [2]: https://tools.ietf.org/html/rfc4861#section-10 [3]: https://tools.ietf.org/html/rfc4861#appendix-C Tests: pkg/tcpip/stack:stack_test - TestNeighborCacheAddStaticEntryThenOverflow - TestNeighborCacheClear - TestNeighborCacheClearThenOverflow - TestNeighborCacheConcurrent - TestNeighborCacheDuplicateStaticEntryWithDifferentLinkAddress - TestNeighborCacheDuplicateStaticEntryWithSameLinkAddress - TestNeighborCacheEntry - TestNeighborCacheEntryNoLinkAddress - TestNeighborCacheGetConfig - TestNeighborCacheKeepFrequentlyUsed - TestNeighborCacheNotifiesWaker - TestNeighborCacheOverflow - TestNeighborCacheOverwriteWithStaticEntryThenOverflow - TestNeighborCacheRemoveEntry - TestNeighborCacheRemoveEntryThenOverflow - TestNeighborCacheRemoveStaticEntry - TestNeighborCacheRemoveStaticEntryThenOverflow - TestNeighborCacheRemoveWaker - TestNeighborCacheReplace - TestNeighborCacheResolutionFailed - TestNeighborCacheResolutionTimeout - TestNeighborCacheSetConfig - TestNeighborCacheStaticResolution - TestEntryAddsAndClearsWakers - TestEntryDelayToProbe - TestEntryDelayToReachableWhenSolicitedOverrideConfirmation - TestEntryDelayToReachableWhenUpperLevelConfirmation - TestEntryDelayToStaleWhenConfirmationWithDifferentAddress - TestEntryDelayToStaleWhenProbeWithDifferentAddress - TestEntryFailedGetsDeleted - TestEntryIncompleteToFailed - TestEntryIncompleteToIncompleteDoesNotChangeUpdatedAt - TestEntryIncompleteToReachable - TestEntryIncompleteToReachableWithRouterFlag - TestEntryIncompleteToStale - TestEntryInitiallyUnknown - TestEntryProbeToFailed - TestEntryProbeToReachableWhenSolicitedConfirmationWithSameAddress - TestEntryProbeToReachableWhenSolicitedOverrideConfirmation - TestEntryProbeToStaleWhenConfirmationWithDifferentAddress - TestEntryProbeToStaleWhenProbeWithDifferentAddress - TestEntryReachableToStaleWhenConfirmationWithDifferentAddress - TestEntryReachableToStaleWhenConfirmationWithDifferentAddressAndOverride - TestEntryReachableToStaleWhenProbeWithDifferentAddress - TestEntryReachableToStaleWhenTimeout - TestEntryStaleToDelay - TestEntryStaleToReachableWhenSolicitedOverrideConfirmation - TestEntryStaleToStaleWhenOverrideConfirmation - TestEntryStaleToStaleWhenProbeUpdateAddress - TestEntryStaysDelayWhenOverrideConfirmationWithSameAddress - TestEntryStaysProbeWhenOverrideConfirmationWithSameAddress - TestEntryStaysReachableWhenConfirmationWithRouterFlag - TestEntryStaysReachableWhenProbeWithSameAddress - TestEntryStaysStaleWhenProbeWithSameAddress - TestEntryUnknownToIncomplete - TestEntryUnknownToStale - TestEntryUnknownToUnknownWhenConfirmationWithUnknownAddress pkg/tcpip/stack:stack_x_test - TestDefaultNUDConfigurations - TestNUDConfigurationFailsForNotSupported - TestNUDConfigurationsBaseReachableTime - TestNUDConfigurationsDelayFirstProbeTime - TestNUDConfigurationsMaxMulticastProbes - TestNUDConfigurationsMaxRandomFactor - TestNUDConfigurationsMaxUnicastProbes - TestNUDConfigurationsMinRandomFactor - TestNUDConfigurationsRetransmitTimer - TestNUDConfigurationsUnreachableTime - TestNUDStateReachableTime - TestNUDStateRecomputeReachableTime - TestSetNUDConfigurationFailsForBadNICID - TestSetNUDConfigurationFailsForNotSupported [1]: https://tools.ietf.org/html/rfc4861 [2]: https://tools.ietf.org/html/rfc4861#section-10 [3]: https://tools.ietf.org/html/rfc4861#appendix-C Updates #1889 Updates #1894 Updates #1895 Updates #1947 Updates #1948 Updates #1949 Updates #1950 PiperOrigin-RevId: 324070795
2020-07-30Use brodcast MAC for broadcast IPv4 packetsGhanan Gowripalan
When sending packets to a known network's broadcast address, use the broadcast MAC address. Test: - stack_test.TestOutgoingSubnetBroadcast - udp_test.TestOutgoingSubnetBroadcast PiperOrigin-RevId: 324062407
2020-07-28Redirect TODO to GitHub issuesFabricio Voznika
PiperOrigin-RevId: 323715260
2020-07-27Add ability to send unicast ARP requests and Neighbor SolicitationsSam Balana
The previous implementation of LinkAddressRequest only supported sending broadcast ARP requests and multicast Neighbor Solicitations. The ability to send these packets as unicast is required for Neighbor Unreachability Detection. Tests: pkg/tcpip/network/arp:arp_test - TestLinkAddressRequest pkg/tcpip/network/ipv6:ipv6_test - TestLinkAddressRequest Updates #1889 Updates #1894 Updates #1895 Updates #1947 Updates #1948 Updates #1949 Updates #1950 PiperOrigin-RevId: 323451569
2020-07-27Fix memory accounting in TCP pending segment queue.Bhasker Hariharan
TCP now tracks the overhead of the segment structure itself in it's out-of-order queue (pending). This is required to ensure that a malicious sender sending 1 byte out-of-order segments cannot queue like 1000's of segments which bloat up memory usage. We also reduce the default receive window to 32KB. With TCP moderation there is no need to keep this window at 1MB which means that for new connections the default out-of-order queue will be small unless the application actually reads the data that is being sent. This prevents a sender from just maliciously filling up pending buf with lots of tiny out-of-order segments. PiperOrigin-RevId: 323450913
2020-07-23Add AfterFunc to tcpip.ClockSam Balana
Changes the API of tcpip.Clock to also provide a method for scheduling and rescheduling work after a specified duration. This change also implements the AfterFunc method for existing implementations of tcpip.Clock. This is the groundwork required to mock time within tests. All references to CancellableTimer has been replaced with the tcpip.Job interface, allowing for custom implementations of scheduling work. This is a BREAKING CHANGE for clients that implement their own tcpip.Clock or use tcpip.CancellableTimer. Migration plan: 1. Add AfterFunc(d, f) to tcpip.Clock 2. Replace references of tcpip.CancellableTimer with tcpip.Job 3. Replace calls to tcpip.CancellableTimer#StopLocked with tcpip.Job#Cancel 4. Replace calls to tcpip.CancellableTimer#Reset with tcpip.Job#Schedule 5. Replace calls to tcpip.NewCancellableTimer with tcpip.NewJob. PiperOrigin-RevId: 322906897
2020-07-23iptables: use keyed array literalsKevin Krakauer
PiperOrigin-RevId: 322882426
2020-07-23Merge pull request #3207 from kevinGC:icmp-connectgVisor bot
PiperOrigin-RevId: 322853192
2020-07-23Fix wildcard bind for raw socket.Bhasker Hariharan
Fixes #3334 PiperOrigin-RevId: 322846384
2020-07-22make connect(2) fail when dest is unreachableKevin Krakauer
Previously, ICMP destination unreachable datagrams were ignored by TCP endpoints. This caused connect to hang when an intermediate router couldn't find a route to the host. This manifested as a Kokoro error when Docker IPv6 was enabled. The Ruby image test would try to install the sinatra gem and hang indefinitely attempting to use an IPv6 address. Fixes #3079.
2020-07-22iptables: don't NAT existing connectionsKevin Krakauer
Fixes a NAT bug that manifested as: - A SYN was sent from gVisor to another host, unaffected by iptables. - The corresponding SYN/ACK was NATted by a PREROUTING REDIRECT rule despite being part of the existing connection. - The socket that sent the SYN never received the SYN/ACK and thus a connection could not be established. We handle this (as Linux does) by tracking all connections, inserting a no-op conntrack rule for new connections with no rules of their own. Needed for istio support (#170).
2020-07-22iptables: replace maps with arraysKevin Krakauer
For iptables users, Check() is a hot path called for every packet one or more times. Let's avoid a bunch of map lookups. PiperOrigin-RevId: 322678699
2020-07-22Support for receiving outbound packets in AF_PACKET.Bhasker Hariharan
Updates #173 PiperOrigin-RevId: 322665518
2020-07-16Add support to return protocol in recvmsg for AF_PACKET.Bhasker Hariharan
Updates #173 PiperOrigin-RevId: 321690756
2020-07-16Add ethernet broadcast address constantGhanan Gowripalan
PiperOrigin-RevId: 321620517
2020-07-15iptables: remove check for NetworkHeaderKevin Krakauer
This is no longer necessary, as we always set NetworkHeader before calling iptables.Check. PiperOrigin-RevId: 321461978
2020-07-15fdbased: Vectorized write for packet; relax writev syscall filter.Ting-Yu Wang
Now it calls pkt.Data.ToView() when writing the packet. This may require copying when the packet is large, which puts the worse case in an even worse situation. This sent out in a separate preparation change as it requires syscall filter changes. This change will be followed by the change for the adoption of the new PacketHeader API. PiperOrigin-RevId: 321447003
2020-07-15Add support for SO_ERROR to packet sockets.Bhasker Hariharan
Packet sockets also seem to allow double binding and do not return an error on linux. This was tested by running the syscall test in a linux namespace as root and the current test DoubleBind fails@HEAD. Passes after this change. Updates #173 PiperOrigin-RevId: 321445137
2020-07-15Fix minor bugs in a couple of interface IOCTLs.Bhasker Hariharan
gVisor incorrectly returns the wrong ARP type for SIOGIFHWADDR. This breaks tcpdump as it tries to interpret the packets incorrectly. Similarly, SIOCETHTOOL is used by tcpdump to query interface properties which fails with an EINVAL since we don't implement it. For now change it to return EOPNOTSUPP to indicate that we don't support the query rather than return EINVAL. NOTE: ARPHRD types for link endpoints are distinct from NIC capabilities and NIC flags. In Linux all 3 exist eg. ARPHRD types are stored in dev->type field while NIC capabilities are more like the device features which can be queried using SIOCETHTOOL but not modified and NIC Flags are fields that can be modified from user space. eg. NIC status (UP/DOWN/MULTICAST/BROADCAST) etc. Updates #2746 PiperOrigin-RevId: 321436525
2020-07-13Merge pull request #2672 from amscanne:shim-integratedgVisor bot
PiperOrigin-RevId: 321053634
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