From 412ed94744d16806fbec3bd250fd94e71cde5a1f Mon Sep 17 00:00:00 2001
From: Isaku Yamahata <yamahata@valinux.co.jp>
Date: Thu, 20 Dec 2012 15:12:52 +0000
Subject: [PATCH] ip_gre: make ipgre_tunnel_xmit() not parse network header as
IP unconditionally
ipgre_tunnel_xmit() parses network header as IP unconditionally.
But transmitting packets are not always IP packet. For example such packet
can be sent by packet socket with sockaddr_ll.sll_protocol set.
So make the function check if skb->protocol is IP.
Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
net/ipv4/ip_gre.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index a85ae2f7a21cb1..8fcf0ed76548a3 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -760,7 +760,10 @@ static netdev_tx_t ipgre_tunnel_xmit(struct sk_buff *skb, struct net_device *dev
if (dev->header_ops && dev->type == ARPHRD_IPGRE) {
gre_hlen = 0;
- tiph = (const struct iphdr *)skb->data;
+ if (skb->protocol == htons(ETH_P_IP))
+ tiph = (const struct iphdr *)skb->data;
+ else
+ tiph = &tunnel->parms.iph;
} else {
gre_hlen = tunnel->hlen;
tiph = &tunnel->parms.iph;
--
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