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path: root/pkg/tcpip/tcpip.go
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2020-05-20Internal change.gVisor bot
PiperOrigin-RevId: 312559963
2020-05-13Fix TCP segment retransmit timeout handling.Mithun Iyer
As per RFC 1122 and Linux retransmit timeout handling: - The segment retransmit timeout needs to exponentially increase and cap at a predefined value. - TCP connection needs to timeout after a predefined number of segment retransmissions. - TCP connection should not timeout when the retranmission timeout exceeds MaxRTO, predefined upper bound. Fixes #2673 PiperOrigin-RevId: 311463961
2020-05-13Stub support for TCP_SYNCNT and TCP_WINDOW_CLAMP.Bhasker Hariharan
This change adds support for TCP_SYNCNT and TCP_WINDOW_CLAMP options in GetSockOpt/SetSockOpt. This change does not really change any behaviour in Netstack and only stores/returns the stored value. Actual honoring of these options will be added as required. Fixes #2626, #2625 PiperOrigin-RevId: 311453777
2020-04-16Fix data race in tcp_test.Bhasker Hariharan
This change makes SynRcvdCountThreshold and the global synRcvdCount into a stack configurable value. This is required because in cases like mod_proxy which create multiple Stack instances the count will be a global value that impacts all Stack instances. Further the tests relied on modifying the global threshold to simulate tests where we want to verify SYN cookie based behaviour. This lead to data races due to the global being modified/read without locks or atomics. PiperOrigin-RevId: 306947723
2020-04-14Reduce flakiness in tcp_test.Bhasker Hariharan
Tests now use a MinRTO of 3s instead of default 200ms. This reduced flakiness in a lot of the congestion control/recovery tests which were flaky due to retransmit timer firing too early in case the test executors were overloaded. This change also bumps some of the timeouts in tests which were too sensitive to timer variations and reduces the number of slow start iterations which can make the tests run for too long and also trigger retansmit timeouts etc if the executor is overloaded. PiperOrigin-RevId: 306562645
2020-04-09Convert int and bool socket options to use GetSockOptInt and GetSockOptBoolAndrei Vagin
PiperOrigin-RevId: 305699233
2020-03-26Support owner matching for iptables.Nayana Bidari
This feature will match UID and GID of the packet creator, for locally generated packets. This match is only valid in the OUTPUT and POSTROUTING chains. Forwarded packets do not have any socket associated with them. Packets from kernel threads do have a socket, but usually no owner.
2020-02-24Add support for tearing down protocol dispatchers and TIME_WAIT endpoints.Ian Gudger
Protocol dispatchers were previously leaked. Bypassing TIME_WAIT is required to test this change. Also fix a race when a socket in SYN-RCVD is closed. This is also required to test this change. PiperOrigin-RevId: 296922548
2020-02-18Enable IPV6_RECVTCLASS socket option for datagram socketsgVisor bot
Added the ability to get/set the IP_RECVTCLASS socket option on UDP endpoints. If enabled, traffic class from the incoming Network Header passed as ancillary data in the ControlMessages. Adding Get/SetSockOptBool to decrease the overhead of getting/setting simple options. (This was absorbed in a CL that will be landing before this one). Test: * Added unit test to udp_test.go that tests getting/setting as well as verifying that we receive expected TOS from incoming packet. * Added a syscall test for verifying getting/setting * Removed test skip for existing syscall test to enable end to end test. PiperOrigin-RevId: 295840218
2020-02-13Internal change.gVisor bot
PiperOrigin-RevId: 294952610
2020-02-06Perform DAD on IPv6 addresses when enabling a NICGhanan Gowripalan
Addresses may be added before a NIC is enabled. Make sure DAD is performed on the permanent IPv6 addresses when they get enabled. Test: - stack_test.TestDoDADWhenNICEnabled - stack.TestDisabledRxStatsWhenNICDisabled PiperOrigin-RevId: 293697429
2020-02-05recv() on a closed TCP socket returns ENOTCONNEyal Soha
From RFC 793 s3.9 p58 Event Processing: If RECEIVE Call arrives in CLOSED state and the user has access to such a connection, the return should be "error: connection does not exist" Fixes #1598 PiperOrigin-RevId: 293494287
2020-01-29Add support for TCP_DEFER_ACCEPT.Bhasker Hariharan
PiperOrigin-RevId: 292233574
2020-01-21Add a new TCP stat for current open connections.Mithun Iyer
Such a stat accounts for all connections that are currently established and not yet transitioned to close state. Also fix bug in double increment of CurrentEstablished stat. Fixes #1579 PiperOrigin-RevId: 290827365
2020-01-21Merge pull request #1558 from kevinGC:iptables-write-input-dropgVisor bot
PiperOrigin-RevId: 290793754
2020-01-17Filter out received packets with a local source IP address.Eyal Soha
CERT Advisory CA-96.21 III. Solution advises that devices drop packets which could not have correctly arrived on the wire, such as receiving a packet where the source IP address is owned by the device that sent it. Fixes #1507 PiperOrigin-RevId: 290378240
2020-01-14Implement {g,s}etsockopt(IP_RECVTOS) for UDP socketsTamir Duberstein
PiperOrigin-RevId: 289718534
2020-01-13Merge branch 'master' into iptables-write-input-dropKevin Krakauer
2020-01-09New sync package.Ian Gudger
* Rename syncutil to sync. * Add aliases to sync types. * Replace existing usage of standard library sync package. This will make it easier to swap out synchronization primitives. For example, this will allow us to use primitives from github.com/sasha-s/go-deadlock to check for lock ordering violations. Updates #1472 PiperOrigin-RevId: 289033387
2020-01-09Change BindToDeviceOption to store NICIDEyal Soha
This makes it possible to call the sockopt from go even when the NIC has no name. PiperOrigin-RevId: 288955236
2020-01-08Getting a panic when running tests. For some reason the filter table isKevin Krakauer
ending up with the wrong chains and is indexing -1 into rules.
2020-01-08Introduce tcpip.SockOptBoolTamir Duberstein
...and port V6OnlyOption to it. PiperOrigin-RevId: 288789451
2020-01-08Rename tcpip.SockOpt{,Int}Tamir Duberstein
PiperOrigin-RevId: 288772878
2019-12-26Automated rollback of changelist 287029703gVisor bot
PiperOrigin-RevId: 287217899
2019-12-24Enable IP_RECVTOS socket option for datagram socketsRyan Heacock
Added the ability to get/set the IP_RECVTOS socket option on UDP endpoints. If enabled, TOS from the incoming Network Header passed as ancillary data in the ControlMessages. Test: * Added unit test to udp_test.go that tests getting/setting as well as verifying that we receive expected TOS from incoming packet. * Added a syscall test PiperOrigin-RevId: 287029703
2019-12-11Add support for TCP_USER_TIMEOUT option.Bhasker Hariharan
The implementation follows the linux behavior where specifying a TCP_USER_TIMEOUT will cause the resend timer to honor the user specified timeout rather than the default rto based timeout. Further it alters when connections are timedout due to keepalive failures. It does not alter the behavior of when keepalives are sent. This is as per the linux behavior. PiperOrigin-RevId: 285099795
2019-12-06Add TCP stats for connection close and keep-alive timeouts.Mithun Iyer
Fix bugs in updates to TCP CurrentEstablished stat. Fixes #1277 PiperOrigin-RevId: 284292459
2019-11-27Add support for receiving TOS and TCLASS control messages in hostinet.Dean Deng
This involves allowing getsockopt/setsockopt for the corresponding socket options, as well as allowing hostinet to process control messages received from the actual recvmsg syscall. PiperOrigin-RevId: 282851425
2019-11-07Add support for TIME_WAIT timeout.Bhasker Hariharan
This change adds explicit support for honoring the 2MSL timeout for sockets in TIME_WAIT state. It also adds support for the TCP_LINGER2 option that allows modification of the FIN_WAIT2 state timeout duration for a given socket. It also adds an option to modify the Stack wide TIME_WAIT timeout but this is only for testing. On Linux this is fixed at 60s. Further, we also now correctly process RST's in CLOSE_WAIT and close the socket similar to linux without moving it to error state. We also now handle SYN in ESTABLISHED state as per RFC5961#section-4.1. Earlier we would just drop these SYNs. Which can result in some tests that pass on linux to fail on gVisor. Netstack now honors TIME_WAIT correctly as well as handles the following cases correctly. - TCP RSTs in TIME_WAIT are ignored. - A duplicate TCP FIN during TIME_WAIT extends the TIME_WAIT and a dup ACK is sent in response to the FIN as the dup FIN indicates potential loss of the original final ACK. - An out of order segment during TIME_WAIT generates a dup ACK. - A new SYN w/ a sequence number > the highest sequence number in the previous connection closes the TIME_WAIT early and opens a new connection. Further to make the SYN case work correctly the ISN (Initial Sequence Number) generation for Netstack has been updated to be as per RFC. Its not a pure random number anymore and follows the recommendation in https://tools.ietf.org/html/rfc6528#page-3. The current hash used is not a cryptographically secure hash function. A separate change will update the hash function used to Siphash similar to what is used in Linux. PiperOrigin-RevId: 279106406
2019-11-06Discover default routers from Router AdvertisementsGhanan Gowripalan
This change allows the netstack to do NDP's Router Discovery as outlined by RFC 4861 section 6.3.4. Note, this change will not break existing uses of netstack as the default configuration for the stack options is set in such a way that Router Discovery will not be performed. See `stack.Options` and `stack.NDPConfigurations` for more details. This change introduces 2 options required to take advantage of Router Discovery, all available under NDPConfigurations: - HandleRAs: Whether or not NDP RAs are processes - DiscoverDefaultRouters: Whether or not Router Discovery is performed Another note: for a NIC to process Router Advertisements, it must not be a router itself. Currently the netstack does not have per-interface routing configuration; the routing/forwarding configuration is controlled stack-wide. Therefore, if the stack is configured to enable forwarding/routing, no Router Advertisements will be processed. Tests: Unittest to make sure that Router Discovery and updates to the routing table only occur if explicitly configured to do so. Unittest to make sure at max stack.MaxDiscoveredDefaultRouters discovered default routers are remembered. PiperOrigin-RevId: 278965143
2019-10-25Convert DelayOption to the newer/faster SockOpt int type.Ian Gudger
DelayOption is set on all new endpoints in gVisor. PiperOrigin-RevId: 276746791
2019-10-23Merge pull request #641 from tanjianfeng:mastergVisor bot
PiperOrigin-RevId: 276380008
2019-10-21AF_PACKET support for netstack (aka epsocket).Kevin Krakauer
Like (AF_INET, SOCK_RAW) sockets, AF_PACKET sockets require CAP_NET_RAW. With runsc, you'll need to pass `--net-raw=true` to enable them. Binding isn't supported yet. PiperOrigin-RevId: 275909366
2019-10-15Set NDP hop limit in accordance with RFC 4861Tamir Duberstein
...and do not populate link address cache at dispatch. This partially reverts 313c767b0001bf6271405f1b765b60a334d6e911, which caused malformed packets (e.g. NDP Neighbor Adverts with incorrect hop limit values) to populate the address cache. In particular, this masked a bug that was introduced to the Neighbor Advert generation code in 7c1587e3401a010d1865df61dbaf117c77dd062e. PiperOrigin-RevId: 274865182
2019-10-15netstack: add counters for tcp CurrEstab and EstabResetsJianfeng Tan
Signed-off-by: Jianfeng Tan <henry.tjf@antfin.com>
2019-10-14Internal change.gVisor bot
PiperOrigin-RevId: 274700093
2019-10-10Fix bugs in fragment handling.Bhasker Hariharan
Strengthen the header.IPv4.IsValid check to correctly check for IHL/TotalLength fields. Also add a check to make sure fragmentOffsets + size of the fragment do not cause a wrap around for the end of the fragment. PiperOrigin-RevId: 274049313
2019-10-09Internal change.gVisor bot
PiperOrigin-RevId: 273861936
2019-10-07Implement IP_TTL.Ian Gudger
Also change the default TTL to 64 to match Linux. PiperOrigin-RevId: 273430341
2019-10-03Implement proper local broadcast behaviorChris Kuiper
The behavior for sending and receiving local broadcast (255.255.255.255) traffic is as follows: Outgoing -------- * A broadcast packet sent on a socket that is bound to an interface goes out that interface * A broadcast packet sent on an unbound socket follows the route table to select the outgoing interface + if an explicit route entry exists for 255.255.255.255/32, use that one + else use the default route * Broadcast packets are looped back and delivered following the rules for incoming packets (see next). This is the same behavior as for multicast packets, except that it cannot be disabled via sockopt. Incoming -------- * Sockets wishing to receive broadcast packets must bind to either INADDR_ANY (0.0.0.0) or INADDR_BROADCAST (255.255.255.255). No other socket receives broadcast packets. * Broadcast packets are multiplexed to all sockets matching it. This is the same behavior as for multicast packets. * A socket can bind to 255.255.255.255:<port> and then receive its own broadcast packets sent to 255.255.255.255:<port> In addition, this change implicitly fixes an issue with multicast reception. If two sockets want to receive a given multicast stream and one is bound to ANY while the other is bound to the multicast address, only one of them will receive the traffic. PiperOrigin-RevId: 272792377
2019-09-27Implement SO_BINDTODEVICE sockoptgVisor bot
PiperOrigin-RevId: 271644926
2019-09-23netstack: convert more socket options to {Set,Get}SockOptIntAndrei Vagin
PiperOrigin-RevId: 270763208
2019-09-12Implement splice methods for pipes and sockets.Adin Scannell
This also allows the tee(2) implementation to be enabled, since dup can now be properly supported via WriteTo. Note that this change necessitated some minor restructoring with the fs.FileOperations splice methods. If the *fs.File is passed through directly, then only public API methods are accessible, which will deadlock immediately since the locking is already done by fs.Splice. Instead, we pass through an abstract io.Reader or io.Writer, which elide locks and use the underlying fs.FileOperations directly. PiperOrigin-RevId: 268805207
2019-09-06Remove reundant global tcpip.LinkEndpointID.Ian Gudger
PiperOrigin-RevId: 267709597
2019-09-04Handle subnet and broadcast addresses correctly with NIC.subnetsChris Kuiper
This also renames "subnet" to "addressRange" to avoid any more confusion with an interface IP's subnet. Lastly, this also removes the Stack.ContainsSubnet(..) API since it isn't used by anyone. Plus the same information can be obtained from Stack.NICAddressRanges(). PiperOrigin-RevId: 267229843
2019-09-03Make UDP traceroute work.Bhasker Hariharan
Adds support to generate Port Unreachable messages for UDP datagrams received on a port for which there is no valid endpoint. Fixes #703 PiperOrigin-RevId: 267034418
2019-08-23Implement fmt.Stringer on Route by valueTamir Duberstein
This is more convenient, since it implements the interface for both value and pointer. PiperOrigin-RevId: 265086510
2019-08-21Use tcpip.Subnet in tcpip.RouteTamir Duberstein
This is the first step in replacing some of the redundant types with the standard library equivalents. PiperOrigin-RevId: 264706552
2019-08-20Add tcpip.Route.String and tcpip.AddressMask.PrefixChris Kuiper
PiperOrigin-RevId: 264544163
2019-08-16netstack: disconnect an unix socket only if the address family is AF_UNSPECAndrei Vagin
Linux allows to call connect for ANY and the zero port. PiperOrigin-RevId: 263892534
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