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This commit is contained in:
Nate Brown
2025-04-16 16:21:53 -05:00
parent f42878c5fc
commit ad319b964d
3 changed files with 36 additions and 21 deletions
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54
udp/udp_linux.go
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@@ -5,7 +5,6 @@ package udp
import (
"context"
"encoding/binary"
"fmt"
"net"
"net/netip"
@@ -16,11 +15,13 @@ import (
"github.com/rcrowley/go-metrics"
"github.com/sirupsen/logrus"
"github.com/slackhq/nebula/config"
"golang.org/x/net/ipv6"
"golang.org/x/sys/unix"
)
type StdConn struct {
c *net.UDPConn
c *ipv6.PacketConn
uc *net.UDPConn
rc syscall.RawConn
isV4 bool
l *logrus.Logger
@@ -65,8 +66,7 @@ func NewListener(l *logrus.Logger, ip netip.Addr, port int, multi bool, batch in
_ = c.Close()
return nil, fmt.Errorf("unable to open sysfd: %w", err)
}
return &StdConn{c: uc, rc: rc, isV4: ip.Is4(), l: l, batch: batch}, err
return &StdConn{c: ipv6.NewPacketConn(c), rc: rc, uc: uc, isV4: ip.Is4(), l: l, batch: batch}, err
}
func (u *StdConn) Rebind() error {
@@ -143,36 +143,48 @@ func (u *StdConn) GetSoMark() (int, error) {
}
func (u *StdConn) LocalAddr() (netip.AddrPort, error) {
sa := u.c.LocalAddr()
sa := u.uc.LocalAddr()
return netip.ParseAddrPort(sa.String())
}
func (u *StdConn) ListenOut(r EncReader) {
var ip netip.Addr
var port int
u.msgs, u.buffers, u.names = u.PrepareRawMessages(u.batch)
read := u.ReadMulti
if u.batch == 1 {
read = u.ReadSingle
//u.msgs, u.buffers, u.names = u.PrepareRawMessages(u.batch)
//read := u.ReadMulti
//if u.batch == 1 {
// read = u.ReadSingle
//}
var err error
var n int
msgs := make([]ipv6.Message, u.batch)
for i := range msgs {
msgs[i].Buffers = [][]byte{make([]byte, MTU)}
}
for {
read()
if u.err != nil {
//read()
n, err = u.c.ReadBatch(msgs, 0)
if err != nil {
//TODO: remove logging, return error
u.l.WithError(u.err).Error("udp socket is closed, exiting read loop")
u.l.WithError(err).Error("udp socket is closed, exiting read loop")
return
}
for i := 0; i < int(u.n); i++ {
// Its ok to skip the ok check here, the slicing is the only error that can occur and it will panic
if u.isV4 {
ip, _ = netip.AddrFromSlice(u.names[i][4:8])
} else {
ip, _ = netip.AddrFromSlice(u.names[i][8:24])
for i := 0; i < n; i++ {
switch addr := msgs[i].Addr.(type) {
case *net.UDPAddr:
// Its ok to skip the ok check here, the slicing is the only error that can occur and it will panic
ip, _ = netip.AddrFromSlice(addr.IP)
port = addr.Port
default:
//TODO: this is an error, return?
}
//u.l.Error("GOT A PACKET", msgs[i].Len)
r(netip.AddrPortFrom(ip.Unmap(), binary.BigEndian.Uint16(u.names[i][2:4])), u.buffers[i][:u.msgs[i].Len])
r(netip.AddrPortFrom(ip.Unmap(), uint16(port)), msgs[i].Buffers[0][:msgs[i].N])
}
}
}
@@ -245,7 +257,7 @@ func (u *StdConn) innerReadMulti(fd uintptr) bool {
}
func (u *StdConn) WriteTo(b []byte, ip netip.AddrPort) error {
_, err := u.c.WriteToUDPAddrPort(b, ip)
_, err := u.uc.WriteToUDPAddrPort(b, ip)
return err
}
@@ -318,7 +330,7 @@ func (u *StdConn) getMemInfo(meminfo *[unix.SK_MEMINFO_VARS]uint32) error {
}
func (u *StdConn) Close() error {
err := u.c.Close()
err := u.uc.Close()
return err
}