ipip: capture inner headers during encapsulation

Allow IPIP to make use of tx-checksum offloading.

Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv4/ipip.c b/net/ipv4/ipip.c
index 18f5352..b50435b 100644 (file)
--- a/net/ipv4/ipip.c
+++ b/net/ipv4/ipip.c
@@ -483,11 +483,6 @@ static netdev_tx_t ipip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
 
        if (skb->protocol != htons(ETH_P_IP))
                goto tx_error;
-
-       if (skb->ip_summed == CHECKSUM_PARTIAL &&
-           skb_checksum_help(skb))
-               goto tx_error;
-
        old_iph = ip_hdr(skb);
 
        if (tos & 1)
@@ -572,6 +567,13 @@ static netdev_tx_t ipip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
                old_iph = ip_hdr(skb);
        }
 
+       if (!skb->encapsulation) {
+               skb_reset_inner_headers(skb);
+               skb->encapsulation = 1;
+       }
+       if (skb->ip_summed != CHECKSUM_PARTIAL)
+               skb->ip_summed = CHECKSUM_NONE;
+
        skb->transport_header = skb->network_header;
        skb_push(skb, sizeof(struct iphdr));
        skb_reset_network_header(skb);
@@ -599,7 +601,6 @@ static netdev_tx_t ipip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev)
                iph->ttl        =       old_iph->ttl;
 
        nf_reset(skb);
-       skb->ip_summed = CHECKSUM_NONE;
 
        pkt_len = skb->len - skb_transport_offset(skb);
        err = ip_local_out(skb);