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firewall reject packets: cleanup error cases (#957)

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This commit is contained in:
Wade Simmons
2023-11-13 10:43:51 -08:00
committed by GitHub
parent 3356e03d85
commit fe16ea566d
4 changed files with 130 additions and 14 deletions
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26
inside.go
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@@ -83,6 +83,10 @@ func (f *Interface) rejectInside(packet []byte, out []byte, q int) {
}
out = iputil.CreateRejectPacket(packet, out)
if len(out) == 0 {
return
}
_, err := f.readers[q].Write(out)
if err != nil {
f.l.WithError(err).Error("Failed to write to tun")
@@ -94,12 +98,22 @@ func (f *Interface) rejectOutside(packet []byte, ci *ConnectionState, hostinfo *
return
}
// Use some out buffer space to build the packet before encryption
// Need 40 bytes for the reject packet (20 byte ipv4 header, 20 byte tcp rst packet)
// Leave 100 bytes for the encrypted packet (60 byte Nebula header, 40 byte reject packet)
out = out[:140]
outPacket := iputil.CreateRejectPacket(packet, out[100:])
f.sendNoMetrics(header.Message, 0, ci, hostinfo, nil, outPacket, nb, out, q)
out = iputil.CreateRejectPacket(packet, out)
if len(out) == 0 {
return
}
if len(out) > iputil.MaxRejectPacketSize {
if f.l.GetLevel() >= logrus.InfoLevel {
f.l.
WithField("packet", packet).
WithField("outPacket", out).
Info("rejectOutside: packet too big, not sending")
}
return
}
f.sendNoMetrics(header.Message, 0, ci, hostinfo, nil, out, nb, packet, q)
}
func (f *Interface) Handshake(vpnIp iputil.VpnIp) {