From 2176ec1c82eae70a9d43a974455d9bfe3dcd7bd2 Mon Sep 17 00:00:00 2001 From: Eli Cooper Date: Thu, 1 Dec 2016 10:05:10 +0800 Subject: [PATCH] ipv4: Set skb->protocol properly for local output commit f4180439109aa720774baafdd798b3234ab1a0d2 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_IP before dst_output() is called, fixing a bug where GSO packets sent through a sit tunnel are dropped when xfrm is involved. Signed-off-by: Eli Cooper Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/ipv4/ip_output.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c index f2ad5216c438..2b7283303650 100644 --- a/net/ipv4/ip_output.c +++ b/net/ipv4/ip_output.c @@ -102,6 +102,9 @@ int __ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb) iph->tot_len = htons(skb->len); ip_send_check(iph); + + skb->protocol = htons(ETH_P_IP); + return nf_hook(NFPROTO_IPV4, NF_INET_LOCAL_OUT, net, sk, skb, NULL, skb_dst(skb)->dev, dst_output); -- 2.34.1