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2023-03-25tun: use correct IP header comparisons in tcpGRO() and tcpPacketsCanCoalesce()Jordan Whited
tcpGRO() was using an incorrect IPv4 more fragments bit mask. tcpPacketsCanCoalesce() was not distinguishing tcp6 from tcp4, and TTL values were not compared. TTL values should be equal at the IP layer, otherwise the packets should not coalesce. This tracks with the kernel. Reviewed-by: Denton Gentry <dgentry@tailscale.com> Signed-off-by: Jordan Whited <jordan@tailscale.com> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2023-03-25tun: disqualify tcp4 packets w/IP options from coalescingJordan Whited
IP options were not being compared prior to coalescing. They are not commonly used. Disqualification due to nonzero options is in line with the kernel. Reviewed-by: Denton Gentry <dgentry@tailscale.com> Signed-off-by: Jordan Whited <jordan@tailscale.com> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2023-03-23global: remove old style build tagsJason A. Donenfeld
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2023-03-17tun: replace ErrorBatch() with errors.Join()Jordan Whited
Reviewed-by: Maisem Ali <maisem@tailscale.com> Signed-off-by: Jordan Whited <jordan@tailscale.com> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2023-03-13global: buff -> bufJason A. Donenfeld
This always struck me as kind of weird and non-standard. Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2023-03-10tun/netstack: enable TCP Selective AcknowledgementsJordan Whited
Enable TCP SACK for the gVisor Stack used in tun/netstack. This can improve throughput by an order of magnitude in the presence of packet loss. Reviewed-by: James Tucker <james@tailscale.com> Signed-off-by: Jordan Whited <jordan@tailscale.com> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2023-03-10conn: inch BatchSize toward being non-dynamicJason A. Donenfeld
There's not really a use at the moment for making this configurable, and once bind_windows.go behaves like bind_std.go, we'll be able to use constants everywhere. So begin that simplification now. Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2023-03-10conn, device, tun: implement vectorized I/O on LinuxJordan Whited
Implement TCP offloading via TSO and GRO for the Linux tun.Device, which is made possible by virtio extensions in the kernel's TUN driver. Delete conn.LinuxSocketEndpoint in favor of a collapsed conn.StdNetBind. conn.StdNetBind makes use of recvmmsg() and sendmmsg() on Linux. All platforms now fall under conn.StdNetBind, except for Windows, which remains in conn.WinRingBind, which still needs to be adjusted to handle multiple packets. Also refactor sticky sockets support to eventually be applicable on platforms other than just Linux. However Linux remains the sole platform that fully implements it for now. Co-authored-by: James Tucker <james@tailscale.com> Signed-off-by: James Tucker <james@tailscale.com> Signed-off-by: Jordan Whited <jordan@tailscale.com> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2023-03-10conn, device, tun: implement vectorized I/O plumbingJordan Whited
Accept packet vectors for reading and writing in the tun.Device and conn.Bind interfaces, so that the internal plumbing between these interfaces now passes a vector of packets. Vectors move untouched between these interfaces, i.e. if 128 packets are received from conn.Bind.Read(), 128 packets are passed to tun.Device.Write(). There is no internal buffering. Currently, existing implementations are only adjusted to have vectors of length one. Subsequent patches will improve that. Also, as a related fixup, use the unix and windows packages rather than the syscall package when possible. Co-authored-by: James Tucker <james@tailscale.com> Signed-off-by: James Tucker <james@tailscale.com> Signed-off-by: Jordan Whited <jordan@tailscale.com> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2023-02-09tun: guard Device.Events() against chan writesJordan Whited
Signed-off-by: Jordan Whited <jordan@tailscale.com> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2023-02-07global: bump copyright yearJason A. Donenfeld
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2023-02-07tun/netstack: make http examples communicate with each otherSoren L. Hansen
This seems like a much better demonstration as it removes the need for external components. Signed-off-by: Søren L. Hansen <sorenisanerd@gmail.com> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2023-02-07tun/netstack: bump gvisorColin Adler
Bump gVisor to a recent known-good version. Signed-off-by: Colin Adler <colin1adler@gmail.com> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2022-09-20global: bump copyright yearJason A. Donenfeld
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2022-09-20tun/netstack: ensure `(*netTun).incomingPacket` chan is closedColin Adler
Without this, `device.Close()` will deadlock. Signed-off-by: Colin Adler <colin1adler@gmail.com> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2022-09-04all: use Go 1.19 and its atomic typesBrad Fitzpatrick
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2022-08-29tun/netstack: remove separate moduleJason A. Donenfeld
Now that the gvisor deps aren't insane, we can just do this in the main module. Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2022-08-29tun/netstack: bump to latest gvisorShengjing Zhu
To build with go1.19, gvisor needs 99325baf ("Bump gVisor build tags to go1.19"). However gvisor.dev/gvisor/pkg/tcpip/buffer is no longer available, so refactor to use gvisor.dev/gvisor/pkg/tcpip/link/channel directly. Signed-off-by: Shengjing Zhu <i@zhsj.me> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2022-07-04conn, device, tun: set CLOEXEC on fdsBrad Fitzpatrick
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2022-06-01tun: use ByteSliceToString from golang.org/x/sys/unixTobias Klauser
Use unix.ByteSliceToString in (*NativeTun).nameSlice to convert the TUNGETIFF ioctl result []byte to a string. Signed-off-by: Tobias Klauser <tklauser@distanz.ch> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2022-03-16tun/netstack: bump modJason A. Donenfeld
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2022-03-16all: update to Go 1.18Josh Bleecher Snyder
Bump go.mod and README. Switch to upstream net/netip. Use strings.Cut. Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
2022-03-09tun/netstack: check error returned by SetDeadline()Alexander Neumann
Signed-off-by: Alexander Neumann <alexander.neumann@redteam-pentesting.de> [Jason: don't wrap deadline error.] Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2022-03-09tun/netstack: update to latest wireguard-goAlexander Neumann
This commit fixes all callsites of netip.AddrFromSlice(), which has changed its signature and now returns two values. Signed-off-by: Alexander Neumann <alexander.neumann@redteam-pentesting.de> [Jason: remove error handling from AddrFromSlice.] Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2022-02-02tun/netstack: simplify read timeout on ping socketJason A. Donenfeld
I'm not 100% sure this is correct, but it certainly is a lot simpler. Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2022-02-02tun/netstack: implement ICMP pingThomas H. Ptacek
Provide a PacketConn interface for netstack's ICMP endpoint; netstack currently only provides EchoRequest/EchoResponse ICMP support, so this code exposes only an interface for doing ping. Signed-off-by: Thomas Ptacek <thomas@sockpuppet.org> [Jason: rework structure, match std go interfaces, add example code] Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2021-12-09global: apply gofumptJason A. Donenfeld
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2021-11-23global: use netip where possible nowJason A. Donenfeld
There are more places where we'll need to add it later, when Go 1.18 comes out with support for it in the "net" package. Also, allowedips still uses slices internally, which might be suboptimal. Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2021-11-04tun: move wintun to its own repoJason A. Donenfeld
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2021-11-04namedpipe: rename from winpipe to keep in sync with CL299009Jason A. Donenfeld
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2021-10-26wintun: align 64-bit argument on ARM32Jason A. Donenfeld
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2021-10-22tun/netstack: update gvisorMikael Magnusson
Update gvisor to v0.0.0-20211020211948-f76a604701b6, which requires some changes to tun.go: WriteRawPacket: Add function with not implemented error. CreateNetTUN: Replace stack.AddAddress with stack.AddProtocolAddress, and fix IPv6 address in error message. Signed-off-by: Mikael Magnusson <mikma@users.sourceforge.net> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2021-10-20wintun: allow retrieving DLL versionJason A. Donenfeld
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2021-10-16wintun: remove memmod option for dll loadingJason A. Donenfeld
Only wireguard-windows used this, and it's moving to wgnt exclusively. Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2021-10-12global: remove old-style build tagsJason A. Donenfeld
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2021-10-12global: add newer-style build tagsJason A. Donenfeld
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2021-10-12wintun: use new swdevice-based API for upcoming Wintun 0.14Jason A. Donenfeld
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2021-10-11conn,wintun: use unsafe.Slice instead of unsafeSliceJason A. Donenfeld
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2021-10-11memmod: import from wireguard-windowsJason A. Donenfeld
We'll eventually be getting rid of it here, but keep it sync'd up for now. Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2021-09-23tun: make operateonfd.go build tags more specificTobias Klauser
(*NativeTun).operateOnFd is only used on darwin and freebsd. Adjust the build tags accordingly. Signed-off-by: Tobias Klauser <tklauser@distanz.ch> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2021-09-23tun: avoid leaking sock fd in CreateTUN error casesTobias Klauser
At these points, the socket file descriptor is not yet wrapped in an *os.File, so it needs to be closed explicitly on error. Signed-off-by: Tobias Klauser <tklauser@distanz.ch> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2021-09-05global: add new go 1.17 build commentsJason A. Donenfeld
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2021-08-05memmod: register exception handler tablesJason A. Donenfeld
Otherwise recent WDK binaries fail on ARM64, where an exception handler is used for trapping an illegal instruction when ARMv8.1 atomics are being tested for functionality. Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2021-07-29memmod: fix protected delayed load the right wayJason A. Donenfeld
The reason this was failing before is that dloadsup.h's DloadObtainSection was doing a linear search of sections to find which header corresponds with the IMAGE_DELAYLOAD_DESCRIPTOR section, and we were stupidly overwriting the VirtualSize field, so the linear search wound up matching the .text section, which then it found to not be marked writable and failed with FAST_FAIL_DLOAD_PROTECTION_FAILURE. Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2021-07-29memmod: disable protected delayed load for nowJason A. Donenfeld
Probably a bad idea, but we don't currently support it, and those huge windows.NewCallback trampolines make juicer targets anyway. Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2021-05-20tun: linux: account for interface removal from outsideJason A. Donenfeld
On Linux we can run `ip link del wg0`, in which case the fd becomes stale, and we should exit. Since this is an intentional action, don't treat it as an error. Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2021-05-07tun: formatJason A. Donenfeld
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2021-05-07tun: windows: set event before waitingJason A. Donenfeld
In 097af6e ("tun: windows: protect reads from closing") we made sure no functions are running when End() is called, to avoid a UaF. But we still need to kick that event somehow, so that Read() is allowed to exit, in order to release the lock. So this commit calls SetEvent, while moving the closing boolean to be atomic so it can be modified without locks, and then moves to a WaitGroup for the RCU-like pattern. Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2021-05-07tun: windows: rearrange struct to avoid alignment trap on 32bitJason A. Donenfeld
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2021-05-07tun: windows: check alignment in unit testJason A. Donenfeld
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
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