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gre: build header correctly for collect metadata tunnels

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commit 2090714e1d6e80979dd6926be22b0de9ca432273 upstream.

In ipgre (i.e. not gretap) + collect metadata mode, the skb was assumed to
contain Ethernet header and was encapsulated as ETH_P_TEB. This is not the
case, the interface is ARPHRD_IPGRE and the protocol to be used for
encapsulation is skb->protocol.

Fixes: 2e15ea390e6f4 ("ip_gre: Add support to collect tunnel metadata.")
Signed-off-by: Jiri Benc <jbenc@redhat.com>
Acked-by: Pravin B Shelar <pshelar@ovn.org>
Reviewed-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jiri Benc 2016-04-27 11:29:07 +02:00 committed by Greg Kroah-Hartman
parent 6ab8d40774
commit f0dc27db66
1 changed files with 5 additions and 4 deletions
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9
net/ipv4/ip_gre.c
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@ -520,7 +520,8 @@ static struct rtable *gre_get_rt(struct sk_buff *skb,
return ip_route_output_key(net, fl);
}
static void gre_fb_xmit(struct sk_buff *skb, struct net_device *dev)
static void gre_fb_xmit(struct sk_buff *skb, struct net_device *dev,
__be16 proto)
{
struct ip_tunnel_info *tun_info;
const struct ip_tunnel_key *key;
@ -563,7 +564,7 @@ static void gre_fb_xmit(struct sk_buff *skb, struct net_device *dev)
}
flags = tun_info->key.tun_flags & (TUNNEL_CSUM | TUNNEL_KEY);
build_header(skb, tunnel_hlen, flags, htons(ETH_P_TEB),
build_header(skb, tunnel_hlen, flags, proto,
tunnel_id_to_key(tun_info->key.tun_id), 0);
df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;
@ -605,7 +606,7 @@ static netdev_tx_t ipgre_xmit(struct sk_buff *skb,
const struct iphdr *tnl_params;
if (tunnel->collect_md) {
gre_fb_xmit(skb, dev);
gre_fb_xmit(skb, dev, skb->protocol);
return NETDEV_TX_OK;
}
@ -649,7 +650,7 @@ static netdev_tx_t gre_tap_xmit(struct sk_buff *skb,
struct ip_tunnel *tunnel = netdev_priv(dev);
if (tunnel->collect_md) {
gre_fb_xmit(skb, dev);
gre_fb_xmit(skb, dev, htons(ETH_P_TEB));
return NETDEV_TX_OK;
}