IPv6 exthedrs offload registration fixed

Without this fix, ipv6_exthdrs_offload_init doesn't register IPPROTO_DSTOPTS offload, but returns 0 (as the IPPROTO_ROUTING registration actually succeeds).

This then causes the ipv6_gso_segment to drop IPv6 packets with IPPROTO_DSTOPTS header.

The issue detected and the fix verified by running MS HCK Offload LSO test on top of QEMU Windows guests, as this test sends IPv6 packets with IPPROTO_DSTOPTS.

---
 net/ipv6/exthdrs_offload.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

index cf77f3a..447a7fb 100644
@@ -25,11 +25,11 @@ int __init ipv6_exthdrs_offload_init(void)
 	int ret;
 
 	ret = inet6_add_offload(&rthdr_offload, IPPROTO_ROUTING);
-	if (!ret)
+	if (ret)
 		goto out;
 
 	ret = inet6_add_offload(&dstopt_offload, IPPROTO_DSTOPTS);
-	if (!ret)
+	if (ret)
 		goto out_rt;
 
 out:

1.7.9.5

From: Anton Nayshtut <[email protected]>
Date: Wed, 5 Mar 2014 08:30:08 +0200

Can't believe this was broken so obviously for so long :-)

Applied and queued up for -stable, thanks.