ipv6: Set skb->protocol properly for local output

commit b4e479a96fc398ccf83bb1cffb4ffef8631beaf1 upstream.

When xfrm is applied to TSO/GSO packets, it follows this path:

    xfrm_output() -> xfrm_output_gso() -> skb_gso_segment()

where skb_gso_segment() relies on skb->protocol to function properly.

This patch sets skb->protocol to ETH_P_IPV6 before dst_output() is called,
fixing a bug where GSO packets sent through an ipip6 tunnel are dropped
when xfrm is involved.

Signed-off-by: Eli Cooper <elicooper@gmx.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/ipv6/output_core.c b/net/ipv6/output_core.c
index 462f2a76b5c2270dba806e193a4c5bde57e14a39..1d184322a7b1eec00b1b3345b774c1fb363b9f9f 100644 (file)
--- a/net/ipv6/output_core.c
+++ b/net/ipv6/output_core.c
@@ -148,6 +148,8 @@ int __ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb)
        ipv6_hdr(skb)->payload_len = htons(len);
        IP6CB(skb)->nhoff = offsetof(struct ipv6hdr, nexthdr);
 
+       skb->protocol = htons(ETH_P_IPV6);
+
        return nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
                       net, sk, skb, NULL, skb_dst(skb)->dev,
                       dst_output);