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2020-01-13Allow dual stack sockets to operate on AF_INETTamir Duberstein
Fixes #1490 Fixes #1495 PiperOrigin-RevId: 289523250
2020-01-08Return correct length with MSG_TRUNC for unix sockets.Ian Lewis
This change calls a new Truncate method on the EndpointReader in RecvMsg for both netlink and unix sockets. This allows readers such as sockets to peek at the length of data without actually reading it to a buffer. Fixes #993 #1240 PiperOrigin-RevId: 288800167
2019-12-18Switch to netinet/tcp.h and poll.h to for better platform portability.Jay Zhuang
PiperOrigin-RevId: 286249699
2019-12-18Put GetSocketPairs() in unnamed namespaceJay Zhuang
This avoids conflicting definitions of GetSocketPairs() in outer namespace when multiple such cc files are complied for one binary. PiperOrigin-RevId: 286243045
2019-12-17Explicitly export files needed by other packagesgVisor bot
PiperOrigin-RevId: 285968611
2019-12-11Add syscall tests for getxattr and setxattr.Dean Deng
Support for getxattr and setxattr are in subsequent commits. PiperOrigin-RevId: 285088817
2019-12-09Mark test as non flaky.Bhasker Hariharan
PiperOrigin-RevId: 284606133
2019-12-09Add tests for rseq(2)Michael Pratt
Add a decent set of syscall tests for rseq(2). These are a bit awkward because of issues with library integration. libc may register rseq on thread start (including before main on the initial thread), precluding much testing. Thus we run tests in a libc-free subprocess. Support for rseq(2) in gVisor will come in a later commit. PiperOrigin-RevId: 284595994
2019-12-05Implement F_GETOWN_EX and F_SETOWN_EX.Ian Gudger
Some versions of glibc will convert F_GETOWN fcntl(2) calls into F_GETOWN_EX in some cases. PiperOrigin-RevId: 284089373
2019-12-05Explicitly export files needed by other packagesgVisor bot
PiperOrigin-RevId: 283955946
2019-12-03Clean up readv_socket test suite.Dean Deng
Get rid of the SocketTest class, which is only extended by ReadvSocketTest. Also, get rid of TCP sockets (which were unused anyway) from readv_socket.cc. This is a very old test suite that isn't the right place for TCP loopback tests. PiperOrigin-RevId: 283672772
2019-12-03Fix panic due to early transition to Closed.Bhasker Hariharan
The code in rcv.consumeSegment incorrectly transitions to CLOSED state from LAST-ACK before the final ACK for the FIN. Further if receiving a segment changes a socket to a closed state then we should not invoke the sender as the socket is now closed and sending any segments is incorrect. PiperOrigin-RevId: 283625300
2019-12-02Port tests in udp_socket.cc to FuchsiaJay Zhuang
Separate out a test in udp_socket.cc that depends on <linux/errqueue.h> so the rest of the tests can run on Fuchsia. PiperOrigin-RevId: 283322633
2019-11-12Add tests for SO_REUSEADDR and SO_REUSEPORT.Ian Gudger
* Basic tests for the SO_REUSEADDR and SO_REUSEPORT options. * SO_REUSEADDR functional tests for TCP and UDP. * SO_REUSEADDR and SO_REUSEPORT interaction tests for UDP. * Stubbed support for UDP getsockopt(SO_REUSEADDR). PiperOrigin-RevId: 280049265
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
2019-11-04Add NETLINK_KOBJECT_UEVENT socket supportMichael Pratt
NETLINK_KOBJECT_UEVENT sockets send udev-style messages for device events. gVisor doesn't have any device events, so our sockets don't need to do anything once created. systemd's device manager needs to be able to create one of these sockets. It also wants to install a BPF filter on the socket. Since we'll never send any messages, the filter would never be invoked, thus we just fake it out. Fixes #1117 Updates #1119 PiperOrigin-RevId: 278405893
2019-10-23Merge pull request #641 from tanjianfeng:mastergVisor bot
PiperOrigin-RevId: 276380008
2019-10-21Add basic implementation of execveat syscall and associated tests.Dean Deng
Allow file descriptors of directories as well as AT_FDCWD. PiperOrigin-RevId: 275929668
2019-10-18Cleanup host UDS supportMichael Pratt
This change fixes several issues with the fsgofer host UDS support. Notably, it adds support for SOCK_SEQPACKET and SOCK_DGRAM sockets [1]. It also fixes unsafe use of unet.Socket, which could cause a panic if Socket.FD is called when err != nil, and calls to Socket.FD with nothing to prevent the garbage collector from destroying and closing the socket. A set of tests is added to exercise host UDS access. This required extracting most of the syscall test runner into a library that can be used by custom tests. Updates #235 Updates #1003 [1] N.B. SOCK_DGRAM sockets are likely not particularly useful, as a server can only reply to a client that binds first. We don't allow bind, so these are unlikely to be used. PiperOrigin-RevId: 275558502
2019-10-15support /proc/net/snmpJianfeng Tan
This proc file contains statistics according to [1]. [1] https://tools.ietf.org/html/rfc2013 Signed-off-by: Jianfeng Tan <henry.tjf@antfin.com> Change-Id: I9662132085edd8a7783d356ce4237d7ac0800d94
2019-10-07Implement IP_TTL.Ian Gudger
Also change the default TTL to 64 to match Linux. PiperOrigin-RevId: 273430341
2019-10-03Don't report partialResult errors from sendfileAndrei Vagin
The input file descriptor is always a regular file, so sendfile can't lose any data if it will not be able to write them to the output file descriptor. Reported-by: syzbot+22d22330a35fa1c02155@syzkaller.appspotmail.com PiperOrigin-RevId: 272730357
2019-10-02Sanity test that open(2) on a UDS failsMichael Pratt
Spoiler alert: it doesn't. PiperOrigin-RevId: 272513529
2019-09-27Automated rollback of changelist 256276198Adin Scannell
PiperOrigin-RevId: 271665517
2019-09-27Implement SO_BINDTODEVICE sockoptgVisor bot
PiperOrigin-RevId: 271644926
2019-09-24Stub out readahead implementation.Adin Scannell
Closes #261 PiperOrigin-RevId: 270973347
2019-09-19Job control: controlling TTYs and foreground process groups.Kevin Krakauer
Adresses a deadlock with the rolled back change: https://github.com/google/gvisor/commit/b6a5b950d28e0b474fdad160b88bc15314cf9259 Creating a session from an orphaned process group was causing a lock to be acquired twice by a single goroutine. This behavior is addressed, and a test (OrphanRegression) has been added to pty.cc. Implemented the following ioctls: - TIOCSCTTY - set controlling TTY - TIOCNOTTY - remove controlling tty, maybe signal some other processes - TIOCGPGRP - get foreground process group. Also enables tcgetpgrp(). - TIOCSPGRP - set foreground process group. Also enabled tcsetpgrp(). Next steps are to actually turn terminal-generated control characters (e.g. C^c) into signals to the proper process groups, and to send SIGTTOU and SIGTTIN when appropriate. PiperOrigin-RevId: 270088599
2019-09-18Signalfd supportAdin Scannell
Note that the exact semantics for these signalfds are slightly different from Linux. These signalfds are bound to the process at creation time. Reads, polls, etc. are all associated with signals directed at that task. In Linux, all signalfd operations are associated with current, regardless of where the signalfd originated. In practice, this should not be an issue given how signalfds are used. In order to fix this however, we will need to plumb the context through all the event APIs. This gets complicated really quickly, because the waiter APIs are all netstack-specific, and not generally exposed to the context. Probably not worthwhile fixing immediately. PiperOrigin-RevId: 269901749
2019-09-16Migrate from gflags to absl flagsMichael Pratt
absl flags are more modern and we can easily depend on them directly. The repo now successfully builds with --incompatible_load_cc_rules_from_bzl. PiperOrigin-RevId: 269387081
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
2019-09-06Load C++ rules from @rules_ccMichael Pratt
See https://github.com/bazelbuild/bazel/issues/8743. This will be required in Bazel 1.0. Protobuf was updated in https://github.com/protocolbuffers/protobuf/commit/bf0c69e1302fe9568fbe310cc54b37d20a9d16a3#diff-96239ee297e0a92ac6ff96a6bc434ef0. GoogleTest was updated in https://github.com/google/googletest/commit/6fd262ecf787d0dc2a91696fd4bf1d3ee1ebfa14. gflags has not yet been updated, so the repo still won't build with --incompatible_load_cc_rules_from_bzl. Tested with buildifier -warnings=native-cc -lint=warn **/BUILD. PiperOrigin-RevId: 267638515
2019-09-05Deflake aio_test.Jamie Liu
- Most AIO tests call io_setup(nr_events = 128). sizeof(struct io_event) (128*32 = 4096). However, the actual size of the mapping created by io_setup() is determined by: (from fs/aio.c:ioctx_alloc()) /* * We keep track of the number of available ringbuffer slots, to prevent * overflow (reqs_available), and we also use percpu counters for this. * * So since up to half the slots might be on other cpu's percpu counters * and unavailable, double nr_events so userspace sees what they * expected: additionally, we move req_batch slots to/from percpu * counters at a time, so make sure that isn't 0: */ nr_events = max(nr_events, num_possible_cpus() * 4); nr_events *= 2; (from fs/aio.c:aio_setup_ring()) /* Compensate for the ring buffer's head/tail overlap entry */ nr_events += 2; /* 1 is required, 2 for good luck */ size = sizeof(struct aio_ring); size += sizeof(struct io_event) * nr_events; nr_pages = PFN_UP(size); When we mremap() only the first page of a multi-page AIO ring buffer mapping, fs/aio.c:aio_ring_mremap() updates struct kioctx::mmap_base - but struct kioctx::mmap_size is untouched, so sys_io_destroy() => kill_ioctx() vm_unmaps() the mremapped page, plus some number of pages after it. Just get the actual size of the mapping from /proc/self/maps. - Delete test case MremapOver; while it is correct that Linux will not complain if you overwrite the AIO ring buffer with another mapping, it won't actually work in the sense that AIO events will not be written to the new mapping, because Linux stores the struct pages of the ring buffer in struct kioctx::ring_pages and writes to those through kmap() rather than using userspace addresses. - Don't munmap() after mremap(MREMAP_FIXED) returns EFAULT; see new comment in factored-out test case MremapExpansion. PiperOrigin-RevId: 267482903
2019-09-04Run proc_net tests.Ian Gudger
PiperOrigin-RevId: 267280086
2019-08-30Automated rollback of changelist 261387276Bhasker Hariharan
PiperOrigin-RevId: 266491264
2019-08-30Add C++ toolchain and fix compile issues.Adin Scannell
This was accidentally introduced in 31f05d5d4f62c4cd4fe3b95b333d0130aae4b2c1. Fixes #788. PiperOrigin-RevId: 266462843
2019-08-29Implement /proc/net/udp.Rahat Mahmood
PiperOrigin-RevId: 266229756
2019-08-26Internal change.gVisor bot
PiperOrigin-RevId: 265535438
2019-08-20Add tests for raw AF_PACKET sockets.Kevin Krakauer
PiperOrigin-RevId: 264494359
2019-08-19Read iptables via sockopts.Kevin Krakauer
PiperOrigin-RevId: 264180125
2019-08-15Add tests for "cooked" AF_PACKET sockets.Kevin Krakauer
PiperOrigin-RevId: 263666789
2019-08-14Improve SendMsg performance.Bhasker Hariharan
SendMsg before this change would copy all the data over into a new slice even if the underlying socket could only accept a small amount of data. This is really inefficient with non-blocking sockets and under high throughput where large writes could get ErrWouldBlock or if there was say a timeout associated with the sendmsg() syscall. With this change we delay copying bytes in till they are needed and only copy what can be potentially sent/held in the socket buffer. Reducing the need to repeatedly copy data over. Also a minor fix to change state FIN-WAIT-1 when shutdown(..., SHUT_WR) is called instead of when we transmit the actual FIN. Otherwise the socket could remain in CONNECTED state even though the user has called shutdown() on the socket. Updates #627 PiperOrigin-RevId: 263430505
2019-08-02Job control: controlling TTYs and foreground process groups.Kevin Krakauer
(Don't worry, this is mostly tests.) Implemented the following ioctls: - TIOCSCTTY - set controlling TTY - TIOCNOTTY - remove controlling tty, maybe signal some other processes - TIOCGPGRP - get foreground process group. Also enables tcgetpgrp(). - TIOCSPGRP - set foreground process group. Also enabled tcsetpgrp(). Next steps are to actually turn terminal-generated control characters (e.g. C^c) into signals to the proper process groups, and to send SIGTTOU and SIGTTIN when appropriate. PiperOrigin-RevId: 261387276
2019-07-29Add iptables types for syscalls tests.Kevin Krakauer
Unfortunately, Linux's ip_tables.h header doesn't compile in C++ because it implicitly converts from void* to struct xt_entry_target*. C allows this, but C++ does not. So we have to re-implement many types ourselves. Relevant code here: https://github.com/torvalds/linux/blob/master/include/uapi/linux/netfilter_ipv4/ip_tables.h#L222 PiperOrigin-RevId: 260565570
2019-07-12Add IPPROTO_RAW, which allows raw sockets to write IP headers.Kevin Krakauer
iptables also relies on IPPROTO_RAW in a way. It opens such a socket to manipulate the kernel's tables, but it doesn't actually use any of the functionality. Blegh. PiperOrigin-RevId: 257903078
2019-07-02Mark timers_test flaky because setrlimit(RLIMIT_CPU) is broken in some kernels.Neel Natu
https://bugzilla.redhat.com/show_bug.cgi?id=1568337 PiperOrigin-RevId: 256276198
2019-06-24fs: synchronize concurrent writes into files with O_APPENDAndrei Vagin
For files with O_APPEND, a file write operation gets a file size and uses it as offset to call an inode write operation. This means that all other operations which can change a file size should be blocked while the write operation doesn't complete. PiperOrigin-RevId: 254873771
2019-06-24Implement /proc/net/tcp.Rahat Mahmood
PiperOrigin-RevId: 254854346
2019-06-20Implement madvise(MADV_DONTFORK)Neel Natu
PiperOrigin-RevId: 254253777
2019-06-19Mark tcp_socket test flaky (for real)Michael Pratt
The tag on the binary has no effect. It must be on the test. PiperOrigin-RevId: 254103480
2019-06-19Mark tcp_socket test flaky.Neel Natu
PiperOrigin-RevId: 253997465
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