[UDPv6]: Enforce mandatory checksums as per RFC 2460
The current behaviour of computing outgoing checksums is not
compliant with RFC 2460, as per section 8.1:
"Unlike IPv4, when UDP packets are originated by an IPv6 node,
the UDP checksum is not optional. That is, whenever
originating a UDP packet, an IPv6 node must compute a UDP
checksum over the packet and the pseudo-header, [...]"
This modification hence enforces to ignore sk_no_check on UDPv6.
Signed-off-by: Gerrit Renker <[email protected]>
--
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 8d3432a..5122c4d 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -567,11 +567,6 @@ static int udp_v6_push_pending_frames(st
uh->len = htons(up->len);
uh->check = 0;
- if (sk->sk_no_check == UDP_CSUM_NOXMIT) {
- skb->ip_summed = CHECKSUM_NONE;
- goto send;
- }
-
if (skb_queue_len(&sk->sk_write_queue) == 1) {
skb->csum = csum_partial((char *)uh,
sizeof(struct udphdr), skb->csum);