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bluepython508
2026-02-19 10:07:43 +00:00
parent 007438e372
commit 6e637ecf77
1763 changed files with 60820 additions and 279516 deletions
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51
vendor/tailscale.com/wgengine/magicsock/magicsock_linux.go generated vendored
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@@ -1,6 +1,8 @@
// Copyright (c) Tailscale Inc & AUTHORS
// SPDX-License-Identifier: BSD-3-Clause
//go:build linux && !ts_omit_listenrawdisco
package magicsock
import (
@@ -13,7 +15,6 @@ import (
"net"
"net/netip"
"strings"
"syscall"
"time"
"github.com/mdlayher/socket"
@@ -28,7 +29,6 @@ import (
"tailscale.com/types/ipproto"
"tailscale.com/types/key"
"tailscale.com/types/logger"
"tailscale.com/types/nettype"
)
const (
@@ -66,10 +66,10 @@ var (
// fragmented, and we don't want to handle reassembly.
bpf.LoadAbsolute{Off: 6, Size: 2},
// More Fragments bit set means this is part of a fragmented packet.
bpf.JumpIf{Cond: bpf.JumpBitsSet, Val: 0x2000, SkipTrue: 7, SkipFalse: 0},
bpf.JumpIf{Cond: bpf.JumpBitsSet, Val: 0x2000, SkipTrue: 8, SkipFalse: 0},
// Non-zero fragment offset with MF=0 means this is the last
// fragment of packet.
bpf.JumpIf{Cond: bpf.JumpBitsSet, Val: 0x1fff, SkipTrue: 6, SkipFalse: 0},
bpf.JumpIf{Cond: bpf.JumpBitsSet, Val: 0x1fff, SkipTrue: 7, SkipFalse: 0},
// Load IP header length into X register.
bpf.LoadMemShift{Off: 0},
@@ -453,7 +453,13 @@ func (c *Conn) receiveDisco(pc *socket.Conn, isIPV6 bool) {
metricRecvDiscoPacketIPv4.Add(1)
}
c.handleDiscoMessage(payload, srcAddr, key.NodePublic{}, discoRXPathRawSocket)
pt, isGeneveEncap := packetLooksLike(payload)
if pt == packetLooksLikeDisco && !isGeneveEncap {
// The BPF program matching on disco does not currently support
// Geneve encapsulation. isGeneveEncap should not return true if
// payload is disco.
c.handleDiscoMessage(payload, epAddr{ap: srcAddr}, false, key.NodePublic{}, discoRXPathRawSocket)
}
}
}
@@ -483,38 +489,3 @@ func printSockaddr(sa unix.Sockaddr) string {
return fmt.Sprintf("unknown(%T)", sa)
}
}
// trySetSocketBuffer attempts to set SO_SNDBUFFORCE and SO_RECVBUFFORCE which
// can overcome the limit of net.core.{r,w}mem_max, but require CAP_NET_ADMIN.
// It falls back to the portable implementation if that fails, which may be
// silently capped to net.core.{r,w}mem_max.
func trySetSocketBuffer(pconn nettype.PacketConn, logf logger.Logf) {
if c, ok := pconn.(*net.UDPConn); ok {
var errRcv, errSnd error
rc, err := c.SyscallConn()
if err == nil {
rc.Control(func(fd uintptr) {
errRcv = syscall.SetsockoptInt(int(fd), syscall.SOL_SOCKET, syscall.SO_RCVBUFFORCE, socketBufferSize)
if errRcv != nil {
logf("magicsock: [warning] failed to force-set UDP read buffer size to %d: %v; using kernel default values (impacts throughput only)", socketBufferSize, errRcv)
}
errSnd = syscall.SetsockoptInt(int(fd), syscall.SOL_SOCKET, syscall.SO_SNDBUFFORCE, socketBufferSize)
if errSnd != nil {
logf("magicsock: [warning] failed to force-set UDP write buffer size to %d: %v; using kernel default values (impacts throughput only)", socketBufferSize, errSnd)
}
})
}
if err != nil || errRcv != nil || errSnd != nil {
portableTrySetSocketBuffer(pconn, logf)
}
}
}
var controlMessageSize = -1 // bomb if used for allocation before init
func init() {
// controlMessageSize is set to hold a UDP_GRO or UDP_SEGMENT control
// message. These contain a single uint16 of data.
controlMessageSize = unix.CmsgSpace(2)
}