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Commit 2090714e authored by Jiri Benc's avatar Jiri Benc Committed by David S. Miller
Browse files

gre: build header correctly for collect metadata tunnels 



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: 2e15ea39 ("ip_gre: Add support to collect tunnel metadata.")
Signed-off-by: default avatarJiri Benc <jbenc@redhat.com>
Acked-by: default avatarPravin B Shelar <pshelar@ovn.org>
Reviewed-by: default avatarSimon Horman <simon.horman@netronome.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent a64b04d8

net/ipv4/ip_gre.c

+5 −4
Original line number Diff line number Diff line
@@ -523,7 +523,8 @@ 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;
@@ -575,7 +576,7 @@ 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;
@@ -616,7 +617,7 @@ 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;

	}
@@ -660,7 +661,7 @@ 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;

	}