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2020-06-24Merge release-20200608.0-120-gb070e218c (automated)gVisor bot
2020-06-24Add support for Stack level options.Bhasker Hariharan
Linux controls socket send/receive buffers using a few sysctl variables - net.core.rmem_default - net.core.rmem_max - net.core.wmem_max - net.core.wmem_default - net.ipv4.tcp_rmem - net.ipv4.tcp_wmem The first 4 control the default socket buffer sizes for all sockets raw/packet/tcp/udp and also the maximum permitted socket buffer that can be specified in setsockopt(SOL_SOCKET, SO_(RCV|SND)BUF,...). The last two control the TCP auto-tuning limits and override the default specified in rmem_default/wmem_default as well as the max limits. Netstack today only implements tcp_rmem/tcp_wmem and incorrectly uses it to limit the maximum size in setsockopt() as well as uses it for raw/udp sockets. This changelist introduces the other 4 and updates the udp/raw sockets to use the newly introduced variables. The values for min/max match the current tcp_rmem/wmem values and the default value buffers for UDP/RAW sockets is updated to match the linux value of 212KiB up from the really low current value of 32 KiB. Updates #3043 Fixes #3043 PiperOrigin-RevId: 318089805
2020-06-24Merge release-20200608.0-119-g364ac92ba (automated)gVisor bot
2020-06-19Merge release-20200608.0-95-gd962f9f38 (automated)gVisor bot
2020-06-19Implement UDP cheksum verification.gVisor bot
Test: - TestIncrementChecksumErrors Fixes #2943 PiperOrigin-RevId: 317348158
2020-06-19Merge release-20200608.0-89-g70c45e09c (automated)gVisor bot
2020-06-18socket/unix: (*connectionedEndpoint).State() has to take the endpoint lockAndrei Vagin
It accesses e.receiver which is protected by the endpoint lock. WARNING: DATA RACE Write at 0x00c0006aa2b8 by goroutine 189: pkg/sentry/socket/unix/transport.(*connectionedEndpoint).Connect.func1() pkg/sentry/socket/unix/transport/connectioned.go:359 +0x50 pkg/sentry/socket/unix/transport.(*connectionedEndpoint).BidirectionalConnect() pkg/sentry/socket/unix/transport/connectioned.go:327 +0xa3c pkg/sentry/socket/unix/transport.(*connectionedEndpoint).Connect() pkg/sentry/socket/unix/transport/connectioned.go:363 +0xca pkg/sentry/socket/unix.(*socketOpsCommon).Connect() pkg/sentry/socket/unix/unix.go:420 +0x13a pkg/sentry/socket/unix.(*SocketOperations).Connect() <autogenerated>:1 +0x78 pkg/sentry/syscalls/linux.Connect() pkg/sentry/syscalls/linux/sys_socket.go:286 +0x251 Previous read at 0x00c0006aa2b8 by goroutine 270: pkg/sentry/socket/unix/transport.(*baseEndpoint).Connected() pkg/sentry/socket/unix/transport/unix.go:789 +0x42 pkg/sentry/socket/unix/transport.(*connectionedEndpoint).State() pkg/sentry/socket/unix/transport/connectioned.go:479 +0x2f pkg/sentry/socket/unix.(*socketOpsCommon).State() pkg/sentry/socket/unix/unix.go:714 +0xc3e pkg/sentry/socket/unix.(*socketOpsCommon).SendMsg() pkg/sentry/socket/unix/unix.go:466 +0xc44 pkg/sentry/socket/unix.(*SocketOperations).SendMsg() <autogenerated>:1 +0x173 pkg/sentry/syscalls/linux.sendTo() pkg/sentry/syscalls/linux/sys_socket.go:1121 +0x4c5 pkg/sentry/syscalls/linux.SendTo() pkg/sentry/syscalls/linux/sys_socket.go:1134 +0x87 Reported-by: syzbot+c2be37eedc672ed59a86@syzkaller.appspotmail.com PiperOrigin-RevId: 317236996
2020-06-19Merge release-20200608.0-87-g28b8a5cc3 (automated)gVisor bot
2020-06-18iptables: remove metadata structKevin Krakauer
Metadata was useful for debugging and safety, but enough tests exist that we should see failures when (de)serialization is broken. It made stack initialization more cumbersome and it's also getting in the way of ip6tables. PiperOrigin-RevId: 317210653
2020-06-18Merge release-20200608.0-83-g3970c1274 (automated)gVisor bot
2020-06-18Remove various uses of 'whitelist'Michael Pratt
Updates #2972 PiperOrigin-RevId: 317113059
2020-06-18Merge release-20200608.0-82-g07ff909e7 (automated)gVisor bot
2020-06-18Support setsockopt SO_SNDBUF/SO_RCVBUF for raw/udp sockets.Bhasker Hariharan
Updates #173,#6 Fixes #2888 PiperOrigin-RevId: 317087652
2020-06-17Merge release-20200608.0-69-g96519e2c9 (automated)gVisor bot
2020-06-17Implement POSIX locksFabricio Voznika
- Change FileDescriptionImpl Lock/UnlockPOSIX signature to take {start,length,whence}, so the correct offset can be calculated in the implementations. - Create PosixLocker interface to make it possible to share the same locking code from different implementations. Closes #1480 PiperOrigin-RevId: 316910286
2020-06-10Merge release-20200522.0-120-g4b9652d63 (automated)gVisor bot
2020-06-10{S,G}etsockopt for TCP_KEEPCNT option.Nayana Bidari
TCP_KEEPCNT is used to set the maximum keepalive probes to be sent before dropping the connection. WANT_LGTM=jchacon PiperOrigin-RevId: 315758094
2020-06-10Merge release-20200522.0-119-ga5a4f8048 (automated)gVisor bot
2020-06-10socket/unix: handle sendto address argument for connected socketsAndrei Vagin
In case of SOCK_SEQPACKET, it has to be ignored. In case of SOCK_STREAM, EISCONN or EOPNOTSUPP has to be returned. PiperOrigin-RevId: 315755972
2020-06-10Merge release-20200522.0-112-g67565078b (automated)gVisor bot
2020-06-09Implement flock(2) in VFS2Fabricio Voznika
LockFD is the generic implementation that can be embedded in FileDescriptionImpl implementations. Unique lock ID is maintained in vfs.FileDescription and is created on demand. Updates #1480 PiperOrigin-RevId: 315604825
2020-06-07Merge release-20200522.0-94-g32b823fc (automated)gVisor bot
2020-06-07netstack: parse incoming packet headers up-frontKevin Krakauer
Netstack has traditionally parsed headers on-demand as a packet moves up the stack. This is conceptually simple and convenient, but incompatible with iptables, where headers can be inspected and mangled before even a routing decision is made. This changes header parsing to happen early in the incoming packet path, as soon as the NIC gets the packet from a link endpoint. Even if an invalid packet is found (e.g. a TCP header of insufficient length), the packet is passed up the stack for proper stats bookkeeping. PiperOrigin-RevId: 315179302
2020-06-05Merge release-20200522.0-81-g526df4f5 (automated)gVisor bot
2020-06-05Fix error code returned due to Port exhaustion.Bhasker Hariharan
For TCP sockets gVisor incorrectly returns EAGAIN when no ephemeral ports are available to bind during a connect. Linux returns EADDRNOTAVAIL. This change fixes gVisor to return the correct code and adds a test for the same. This change also fixes a minor bug for ping sockets where connect() would fail with EINVAL unless the socket was bound first. Also added tests for testing UDP Port exhaustion and Ping socket port exhaustion. PiperOrigin-RevId: 314988525
2020-06-05Merge release-20200522.0-76-g41da7a56 (automated)gVisor bot
2020-06-05Fix copylocks error about copying IPTables.Ting-Yu Wang
IPTables.connections contains a sync.RWMutex. Copying it will trigger copylocks analysis. Tested by manually enabling nogo tests. sync.RWMutex is added to IPTables for the additional race condition discovered. PiperOrigin-RevId: 314817019
2020-06-03Merge release-20200522.0-72-gd3a8bffe (automated)gVisor bot
2020-06-03Pass PacketBuffer as pointer.Ting-Yu Wang
Historically we've been passing PacketBuffer by shallow copying through out the stack. Right now, this is only correct as the caller would not use PacketBuffer after passing into the next layer in netstack. With new buffer management effort in gVisor/netstack, PacketBuffer will own a Buffer (to be added). Internally, both PacketBuffer and Buffer may have pointers and shallow copying shouldn't be used. Updates #2404. PiperOrigin-RevId: 314610879
2020-06-03Merge release-20200522.0-65-ge6334e81 (automated)gVisor bot
2020-06-02Check that two sockets with different types can't be connected to each otherAndrei Vagin
PiperOrigin-RevId: 314450191
2020-05-29Merge release-20200522.0-40-g3bcfb092 (automated)gVisor bot
2020-05-28Enable iptables source filtering (-s/--source)Kevin Krakauer
2020-05-27Merge release-20200518.0-45-g0bc022b7 (automated)gVisor bot
2020-05-19Fix flaky udp tests by polling before reading.Dean Deng
On native Linux, calling recv/read right after send/write sometimes returns EWOULDBLOCK, if the data has not made it to the receiving socket (even though the endpoints are on the same host). Poll before reading to avoid this. Making this change also uncovered a hostinet bug (gvisor.dev/issue/2726), which is noted in this CL. PiperOrigin-RevId: 312320587
2020-05-16Merge release-20200511.0-251-g420b791 (automated)gVisor bot
2020-05-15Minor formatting updates for gvisor.dev.Adin Scannell
* Aggregate architecture Overview in "What is gVisor?" as it makes more sense in one place. * Drop "user-space kernel" and use "application kernel". The term "user-space kernel" is confusing when some platform implementation do not run in user-space (instead running in guest ring zero). * Clear up the relationship between the Platform page in the user guide and the Platform page in the architecture guide, and ensure they are cross-linked. * Restore the call-to-action quick start link in the main page, and drop the GitHub link (which also appears in the top-right). * Improve image formatting by centering all doc and blog images, and move the image captions to the alt text. PiperOrigin-RevId: 311845158
2020-05-14Merge release-20200422.0-301-g8b8774d (automated)gVisor bot
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
2020-05-12Merge release-20200422.0-293-g725afc6 (automated)gVisor bot
2020-05-12Merge pull request #2678 from nybidari:iptablesgVisor bot
PiperOrigin-RevId: 311203776
2020-05-12Merge release-20200422.0-74-g6a4466a (automated)gVisor bot
2020-05-12Merge pull request #2671 from kevinGC:skip-outputgVisor bot
PiperOrigin-RevId: 311181084
2020-05-12Merge release-20200422.0-72-g8dd1d5b (automated)gVisor bot
2020-05-12Don't call kernel.Task.Block() from netstack.SocketOperations.Write().Jamie Liu
kernel.Task.Block() requires that the caller is running on the task goroutine. netstack.SocketOperations.Write() uses kernel.TaskFromContext() to call kernel.Task.Block() even if it's not running on the task goroutine. Stop doing that. PiperOrigin-RevId: 311178335
2020-05-12iptables: support gid match for owner matching.Nayana Bidari
- Added support for matching gid owner and invert flag for uid and gid. $ iptables -A OUTPUT -p tcp -m owner --gid-owner root -j ACCEPT $ iptables -A OUTPUT -p tcp -m owner ! --uid-owner root -j ACCEPT $ iptables -A OUTPUT -p tcp -m owner ! --gid-owner root -j DROP - Added tests for uid, gid and invert flags.
2020-05-11iptables: check for truly unconditional rulesKevin Krakauer
We weren't properly checking whether the inserted default rule was unconditional.
2020-05-08Merge release-20200422.0-61-gcfd3066 (automated)gVisor bot
2020-05-08iptables - filter packets using outgoing interface.gVisor bot
Enables commands with -o (--out-interface) for iptables rules. $ iptables -A OUTPUT -o eth0 -j ACCEPT PiperOrigin-RevId: 310642286
2020-05-07Merge release-20200422.0-52-g9115f26 (automated)gVisor bot
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