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authorPravin B Shelar <pshelar@nicira.com>2013-06-17 17:50:02 -0700
committerDavid S. Miller <davem@davemloft.net>2013-06-19 18:07:41 -0700
commit3d7b46cd20e300bd6989fb1f43d46f1b9645816e (patch)
treeb8a063f8ecb7e380f0e1672a60815ff48c3f9b56 /net/ipv4/ip_tunnel_core.c
parent0e6fbc5b6c6218987c93b8c7ca60cf786062899d (diff)
ip_tunnel: push generic protocol handling to ip_tunnel module.
Process skb tunnel header before sending packet to protocol handler. this allows code sharing between gre and ovs gre modules. Signed-off-by: Pravin B Shelar <pshelar@nicira.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/ip_tunnel_core.c')
-rw-r--r--net/ipv4/ip_tunnel_core.c34
1 files changed, 34 insertions, 0 deletions
diff --git a/net/ipv4/ip_tunnel_core.c b/net/ipv4/ip_tunnel_core.c
index 927687e83f18..7167b08977df 100644
--- a/net/ipv4/ip_tunnel_core.c
+++ b/net/ipv4/ip_tunnel_core.c
@@ -86,3 +86,37 @@ int iptunnel_xmit(struct net *net, struct rtable *rt,
return pkt_len;
}
EXPORT_SYMBOL_GPL(iptunnel_xmit);
+
+int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto)
+{
+ if (unlikely(!pskb_may_pull(skb, hdr_len)))
+ return -ENOMEM;
+
+ skb_pull_rcsum(skb, hdr_len);
+
+ if (inner_proto == htons(ETH_P_TEB)) {
+ struct ethhdr *eh = (struct ethhdr *)skb->data;
+
+ if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
+ return -ENOMEM;
+
+ if (likely(ntohs(eh->h_proto) >= ETH_P_802_3_MIN))
+ skb->protocol = eh->h_proto;
+ else
+ skb->protocol = htons(ETH_P_802_2);
+
+ } else {
+ skb->protocol = inner_proto;
+ }
+
+ nf_reset(skb);
+ secpath_reset(skb);
+ if (!skb->l4_rxhash)
+ skb->rxhash = 0;
+ skb_dst_drop(skb);
+ skb->vlan_tci = 0;
+ skb_set_queue_mapping(skb, 0);
+ skb->pkt_type = PACKET_HOST;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(iptunnel_pull_header);