linux-kernel - [PATCH 4.8 41/45] ipv4: Set skb->protocol properly for local output

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Message-Id: <20161209161756.634501650@linuxfoundation.org>
Date:   Fri,  9 Dec 2016 17:21:10 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Eli Cooper <elicooper@....com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.8 41/45] ipv4: Set skb->protocol properly for local output

4.8-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Eli Cooper <elicooper@....com>

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 <elicooper@....com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 net/ipv4/ip_output.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -98,6 +98,9 @@ int __ip_local_out(struct net *net, stru

 	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);