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fixup! wgengine/magicsock: actually use AF_PACKET socket for raw disco

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Signed-off-by: Andrew Dunham <andrew@du.nham.ca>
Change-Id: I769276478e5b2e62ee0cb25ccc76e96d34fadc88
This commit is contained in:
Andrew Dunham 2024-08-15 14:09:44 -04:00
parent 85bc5dd3b3
commit 35b91cb66a
1 changed files with 29 additions and 1 deletions
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30
wgengine/magicsock/magicsock_linux.go
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@ -11,6 +11,7 @@ import (
"io"
"net"
"net/netip"
"strings"
"syscall"
"time"
@ -364,7 +365,7 @@ func (c *Conn) receiveDisco(pc *socket.Conn, isIPV6 bool) {
for {
n, src, err := pc.Recvfrom(ctx, buf[:], 0)
if debugRawDiscoReads() {
logf("read from %v = (%v, %v)", src, n, err)
logf("read from %s = (%v, %v)", printSockaddr(src), n, err)
}
if err != nil && (errors.Is(err, net.ErrClosed) || err.Error() == "use of closed file") {
// EOF; no need to print an error
@ -420,6 +421,33 @@ func (c *Conn) receiveDisco(pc *socket.Conn, isIPV6 bool) {
}
}
// printSockaddr is a helper function to pretty-print various sockaddr types.
func printSockaddr(sa unix.Sockaddr) string {
switch sa := sa.(type) {
case *unix.SockaddrInet4:
addr := netip.AddrFrom4(sa.Addr)
return netip.AddrPortFrom(addr, uint16(sa.Port)).String()
case *unix.SockaddrInet6:
addr := netip.AddrFrom16(sa.Addr)
return netip.AddrPortFrom(addr, uint16(sa.Port)).String()
case *unix.SockaddrLinklayer:
hwaddr := sa.Addr[:sa.Halen]
var buf strings.Builder
fmt.Fprintf(&buf, "link(%d):[", sa.Protocol)
for i, b := range hwaddr {
if i > 0 {
buf.WriteByte(':')
}
fmt.Fprintf(&buf, "%02x", b)
}
buf.WriteByte(']')
return buf.String()
default:
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