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tun: disqualify tcp4 packets w/IP options from coalescing

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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>
This commit is contained in:
Jordan Whited
2023-03-24 15:09:47 -07:00
committed by Jason A. Donenfeld
parent 6f895be10d
commit aad7fca9c5
2 changed files with 55 additions and 5 deletions
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10
tun/tcp_offload_linux.go
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@@ -397,9 +397,6 @@ func tcpGRO(bufs [][]byte, offset int, pktI int, table *tcpGROTable, isV6 bool)
if totalLen != len(pkt) {
return false
}
if iphLen < 20 || iphLen > 60 {
return false
}
}
if len(pkt) < iphLen {
return false
@@ -474,13 +471,16 @@ func tcpGRO(bufs [][]byte, offset int, pktI int, table *tcpGROTable, isV6 bool)
return false
}
func isTCP4(b []byte) bool {
func isTCP4NoIPOptions(b []byte) bool {
if len(b) < 40 {
return false
}
if b[0]>>4 != 4 {
return false
}
if b[0]&0x0F != 5 {
return false
}
if b[9] != unix.IPPROTO_TCP {
return false
}
@@ -511,7 +511,7 @@ func handleGRO(bufs [][]byte, offset int, tcp4Table, tcp6Table *tcpGROTable, toW
}
var coalesced bool
switch {
case isTCP4(bufs[i][offset:]):
case isTCP4NoIPOptions(bufs[i][offset:]): // ipv4 packets w/IP options do not coalesce
coalesced = tcpGRO(bufs, offset, i, tcp4Table, false)
case isTCP6NoEH(bufs[i][offset:]): // ipv6 packets w/extension headers do not coalesce
coalesced = tcpGRO(bufs, offset, i, tcp6Table, true)