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2021-10-07Track UDP packets performing REDIRECT NATGhanan Gowripalan
PiperOrigin-RevId: 401620449
2021-10-07Modify the TCP test to receive re-transmitted packet before sending ACK.Nayana Bidari
TestRACKWithWindowFull was sending ACK for the last packet to avoid TLP. But, sometimes the ACK is delayed and the sender sends the re-transmitted packet before receiving ACK. The test is now modified to expect the re-transmitted packet always and then send a DSACK to avoid entering recovery. Before: http://sponge2/6473db18-137a-4afb-9d60-c3eafd236ea9 After: http://sponge2/6a0f744c-7ea3-40fa-8f76-68503bf142ca PiperOrigin-RevId: 401606848
2021-10-07Store timestamps as time.TimeTamir Duberstein
Rather than boiling down to an integer eagerly, do it as late as possible. PiperOrigin-RevId: 401599308
2021-10-06Create null entry connection on first IPTables hookGhanan Gowripalan
...all connections should be tracked by ConnTrack, so create a no-op connection entry on the first hook into IPTables (Prerouting or Output) and let NAT targets modify the connection entry if they need to instead of letting the NAT target create their own connection entry. This also prepares for "twice-NAT" where a packet may have both DNAT and SNAT performed on it (which requires the ability to update ConnTrack entries). Updates #5696. PiperOrigin-RevId: 401360377
2021-10-06Add global lisafs kernel flag.Ayush Ranjan
PiperOrigin-RevId: 401296116
2021-10-05Merge pull request #6687 from zchee:atomicbitops-nosplitgVisor bot
PiperOrigin-RevId: 401152818
2021-10-05Add server implementation for sharedmem endpoints.Bhasker Hariharan
PiperOrigin-RevId: 401088040
2021-10-04Reply to invalid ACKs even when accept queue is fullArthur Sfez
Before checking if there is space in the accept queue, the listener should verify that the cookie is valid. If it is not, instead of silently dropping the packet, reply with an RST. Fixes #6683 PiperOrigin-RevId: 400807346
2021-10-04No split to assembly and noasm functions on atomicbitops packageKoichi Shiraishi
Signed-off-by: Koichi Shiraishi <zchee.io@gmail.com>
2021-10-01Read lock when getting connectionsGhanan Gowripalan
We should avoid taking the write lock to avoid contention when looking for a packet's tracked connection. No need to reap timed out connections when looking for connections as the reaper (which runs periodically) will handle that. PiperOrigin-RevId: 400322514
2021-10-01Drop ConnTrack.handlePacketGhanan Gowripalan
Move the hook specific logic to the IPTables hook functions. This lets us avoid having to perform checks on the hook to determine what action to take. Later changes will drop the need for handlePacket's return value, reducing the value of this function that all hooks call into. PiperOrigin-RevId: 400298023
2021-10-01Drop conn.tcbHookGhanan Gowripalan
...as the packet's direction gives us the information that tcbHook is used to derive. PiperOrigin-RevId: 400280102
2021-10-01Annotate checklocks on mutex protected fieldsGhanan Gowripalan
...to catch lock-related bugs in nogo tests. Updates #6566. PiperOrigin-RevId: 400265818
2021-10-01Merge pull request #6551 from sudo-sturbia:msgqueue/procfsgVisor bot
PiperOrigin-RevId: 400258924
2021-10-01Drop IPTables.checkPacketsGhanan Gowripalan
...and have `CheckOutputPackets`, `CheckPostroutingPackets` call their equivalent methods that operate on a single packet buffer directly. This is so that the `Check{Output, Postrouting}Packets` methods may leverage any hook-specific work that `Check{Output, Postrouting}` may perform. Note: Later changes will add hook-specific logic to the `Check{Output, Postrouting}` methods. PiperOrigin-RevId: 400255651
2021-10-01Let connection handle tracked packetsGhanan Gowripalan
...to save a call to `ConnTrack.connFor` when callers already have a reference to the ConnTrack entry. PiperOrigin-RevId: 400244955
2021-10-01Move pendingEndpoints to acceptQueueTamir Duberstein
This obsoletes the need for the pendingMu and pending, since they are redundant with acceptMu and pendingAccepted. Fixes #6671. PiperOrigin-RevId: 400162391
2021-09-30kernel: print PID in addition to TID in task log messagesAndrei Vagin
For multithreads processes, it is hard to read logs without knowing task pids. And let's print a decimal return codeo for syscalls. A hex return code are usefull for system calls that return addresses. For other syscalls, the decimal form is more readable. PiperOrigin-RevId: 400035449
2021-09-29Avoid comparisons to zero value of acceptQueueTamir Duberstein
PiperOrigin-RevId: 399765414
2021-09-29Rename accepted -> acceptQueueTamir Duberstein
Rename cap -> capacity to avoid collision with the builtin. PiperOrigin-RevId: 399753630
2021-09-29Remove syncRcvdCountTamir Duberstein
This is redundant with listenContext.pendingEndpoints PiperOrigin-RevId: 399722472
2021-09-28Move `safecopy.ReplaceSignalHandler` into `sighandling` package.Etienne Perot
PiperOrigin-RevId: 399560357
2021-09-28Inline handleSynSegmentTamir Duberstein
This function has only one caller. Remove segment reference count manipulation since it is only used synchronously. PiperOrigin-RevId: 399525343
2021-09-28Support naive Masquerade NAT targetGhanan Gowripalan
* Does not accept a port range (Issue #5772). * Does not support checking for tuple conflits (Issue #5773). PiperOrigin-RevId: 399524088
2021-09-27Move `sighandling` package out of `sentry`.Etienne Perot
PiperOrigin-RevId: 399295737
2021-09-27Implement S/R for StatsTamir Duberstein
PiperOrigin-RevId: 399276940
2021-09-27Prevent PacketData from being modified.Ayush Ranjan
PacketData should not be modified and should be treated readonly because it represents packet payload. The old DeleteFront method allowed callers to modify the underlying buffer which should not be allowed. Added a way to consume from the PacketData instead of deleting from it. Updated call points to use that instead. Reported-by: syzbot+faee5cb350f769a52d1b@syzkaller.appspotmail.com PiperOrigin-RevId: 399268473
2021-09-27Store pending endpoints in a setTamir Duberstein
There's no need for synthetic keys here. PiperOrigin-RevId: 399263134
2021-09-27Add procfs files for SysV message queues.Zyad A. Ali
2021-09-24Update the comment for Task.netnsAndrei Vagin
Task.netns can be accessed atomically, so Task.mu isn't needed to access it. PiperOrigin-RevId: 398773947
2021-09-24Merge pull request #6647 from avagin:task-netnsgVisor bot
PiperOrigin-RevId: 398763161
2021-09-23Allow lisafs client to send more data than MaxMessageSize using chunks.Ayush Ranjan
The p9 client does the same. This allows applications to read/write >= 2MB of data. This enables the read write benchmarks to work with lisafs. Updates #5466 PiperOrigin-RevId: 398659947
2021-09-23kernel: allow to access Task.netns without taking Task.muAndrei Vagin
This allows to avoind unnecessary lock-ordering dependencies on task.mu.
2021-09-23Create the cgroupfs mount point in sysfs.Rahat Mahmood
Create the /sys/fs/cgroup directory when cgroups are available. This creates the empty directory to serve as the mountpoint, actually mounting cgroups is left to the launcher/userspace. This is consistent with Linux behaviour. Without this mountpoint, getdents(2) on /sys/fs indicates an empty directory even if the launcher mounts cgroupfs at /sys/fs/cgroup. The launcher can't create the mountpoint directory since sysfs doesn't support mkdir. PiperOrigin-RevId: 398596698
2021-09-23Merge pull request #6573 from avagin:kvm-seccomp-mmapgVisor bot
PiperOrigin-RevId: 398572735
2021-09-23Pass AddressableEndpoint to IPTablesGhanan Gowripalan
...instead of an address. This allows a later change to more precisely select an address based on the NAT type (source vs. destination NAT). PiperOrigin-RevId: 398559901
2021-09-23Implement S/R for TransportEndpointStatsTamir Duberstein
PiperOrigin-RevId: 398559780
2021-09-23Compose ICMP endpoint with datagram-based endpointGhanan Gowripalan
An ICMP endpoint's write path can use the datagram-based endpoint. Updates #6565. Test: Datagram-based generic socket + ICMP/ping syscall tests. PiperOrigin-RevId: 398539844
2021-09-23Introduce method per iptables hookGhanan Gowripalan
...to make it clear what arguments are needed per hook. PiperOrigin-RevId: 398538776
2021-09-23Avoid listenContext.listenEP when it is the receiverTamir Duberstein
This circular reference is misleading at best, and the various code and commentary that claim `listenEP` can be nil are impossible by definition. Add checklocks annotations to enforce preconditions. PiperOrigin-RevId: 398517574
2021-09-22Add Execve and ExitNotifyParent checkpoints.Jamie Liu
Call sites for the two checkpoints aren't added yet. PiperOrigin-RevId: 398375903
2021-09-22Track UDP connectionsGhanan Gowripalan
This will enable NAT to be performed on UDP packets that are sent in response to packets sent by the stack. This will also enable ICMP errors to be properly NAT-ed in response to UDP packets (#5916). Updates #5915. PiperOrigin-RevId: 398373251
2021-09-22Fold rcv_test into tcp_testTamir Duberstein
This prevents go module errors of the form found packages tcp (accept.go) and rcv (rcv_test.go) in ... PiperOrigin-RevId: 398370042
2021-09-22Do not rate limit ICMP Echos by defaultBruno Dal Bo
As per https://www.kernel.org/doc/Documentation/networking/ip-sysctl.txt linux does not limit ICMP Echos by default. icmp_ratemask - INTEGER Mask made of ICMP types for which rates are being limited. Significant bits: IHGFEDCBA9876543210 Default mask: 0000001100000011000 (6168) Bit definitions (see include/linux/icmp.h): 0 Echo Reply 3 Destination Unreachable * 4 Source Quench * 5 Redirect 8 Echo Request B Time Exceeded * C Parameter Problem * D Timestamp Request E Timestamp Reply F Info Request G Info Reply H Address Mask Request I Address Mask Reply * These are rate limited by default (see default mask above) Equivalently for ICMPv6. Lay out foundation for ICMP rate masks, exposing that configuration will be addressed later when the need arises (#6521). Fixes #6519 PiperOrigin-RevId: 398337963
2021-09-22Change EcdsaVerify to specifically P-384 and compute the SHA384 digest.Carmen Hanish
PiperOrigin-RevId: 398336708
2021-09-22kvm: check that safecopy is handled correctly in the guest ring0Andrei Vagin
Signed-off-by: Andrei Vagin <avagin@google.com>
2021-09-22kvm: trap mmap syscalls to map new regions to the guestAndrei Vagin
We install seccomp rules so that the SIGSYS signal is generated for each mmap system call. Then our signal handler executes the real mmap syscall and if a new regions is created, it maps it to the guest. Signed-off-by: Andrei Vagin <avagin@google.com>
2021-09-22kvm/arm: calculate virtual-to-physical mappings only onceAndrei Vagin
2021-09-22kvm: fix tests on arm64AV
2021-09-22Populate forwarded packet buffer's TransportHeaderGhanan Gowripalan
Turns out certain features of iptables (e.g. NAT) will not perform any checks/work unless both the Network and Transport headers are populated. With this change, provide the packet directly to the outgoing network endpoint's `writePacket` method instead of going through `WriteHeaderIncludedPacket` which expected the headers to not be set. PiperOrigin-RevId: 398304004
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