ipv4: Don't pass IP fragments to upper layer GRO handlers.

Upper layer GRO handlers can not handle IP fragments, so exit GRO processing in this case. This fixes ESP GRO because the packet must be reassembled before we can decapsulate, otherwise we get authentication failures. It also aligns IPv4 to IPv6 where packets with fragmentation headers are not passed to upper layer GRO handlers. Fixes: 7785bba ("esp: Add a software GRO codepath") Signed-off-by: Steffen Klassert <[email protected]> Signed-off-by: David S. Miller <[email protected]>
IronBlood · Apr 28, 2017 · 9b83e03 · 9b83e03
1 parent 504926d
commit 9b83e03
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
@@ -1343,6 +1343,9 @@ struct sk_buff **inet_gro_receive(struct sk_buff **head, struct sk_buff *skb)
 	if (*(u8 *)iph != 0x45)
 		goto out_unlock;
 
+	if (ip_is_fragment(iph))
+		goto out_unlock;
+
 	if (unlikely(ip_fast_csum((u8 *)iph, 5)))
 		goto out_unlock;