[INET]: Omit double hash calculations in xxx_frag_intern

[linux-2.6-omap-h63xx.git] / net / ipv4 / xfrm4_mode_tunnel.c

diff --git a/net/ipv4/xfrm4_mode_tunnel.c b/net/ipv4/xfrm4_mode_tunnel.c
index ceb4376f572ae8cd6c7b95845efc38d9820d84bc..1ae9d32276f0a8daa13cf8abbf743b34c691f0f8 100644 (file)
--- a/net/ipv4/xfrm4_mode_tunnel.c
+++ b/net/ipv4/xfrm4_mode_tunnel.c
@@ -16,8 +16,8 @@
 
 static inline void ipip_ecn_decapsulate(struct sk_buff *skb)
 {
-       struct iphdr *outer_iph = skb->nh.iph;
-       struct iphdr *inner_iph = skb->h.ipiph;
+       struct iphdr *outer_iph = ip_hdr(skb);
+       struct iphdr *inner_iph = ipip_hdr(skb);
 
        if (INET_ECN_is_ce(outer_iph->tos))
                IP_ECN_set_ce(inner_iph);
@@ -26,18 +26,12 @@ static inline void ipip_ecn_decapsulate(struct sk_buff *skb)
 static inline void ipip6_ecn_decapsulate(struct iphdr *iph, struct sk_buff *skb)
 {
        if (INET_ECN_is_ce(iph->tos))
-               IP6_ECN_set_ce(skb->nh.ipv6h);
+               IP6_ECN_set_ce(ipv6_hdr(skb));
 }
 
 /* Add encapsulation header.
  *
- * The top IP header will be constructed per RFC 2401.  The following fields
- * in it shall be filled in by x->type->output:
- *      tot_len
- *      check
- *
- * On exit, skb->h will be set to the start of the payload to be processed
- * by x->type->output and skb->nh will be set to the top IP header.
+ * The top IP header will be constructed per RFC 2401.
  */
 static int xfrm4_tunnel_output(struct xfrm_state *x, struct sk_buff *skb)
 {
@@ -46,11 +40,13 @@ static int xfrm4_tunnel_output(struct xfrm_state *x, struct sk_buff *skb)
        struct iphdr *iph, *top_iph;
        int flags;
 
-       iph = skb->nh.iph;
-       skb->h.ipiph = iph;
+       iph = ip_hdr(skb);
 
-       skb->nh.raw = skb_push(skb, x->props.header_len);
-       top_iph = skb->nh.iph;
+       skb_set_network_header(skb, -x->props.header_len);
+       skb->mac_header = skb->network_header +
+                         offsetof(struct iphdr, protocol);
+       skb->transport_header = skb->network_header + sizeof(*iph);
+       top_iph = ip_hdr(skb);
 
        top_iph->ihl = 5;
        top_iph->version = 4;
@@ -84,16 +80,19 @@ static int xfrm4_tunnel_output(struct xfrm_state *x, struct sk_buff *skb)
        top_iph->saddr = x->props.saddr.a4;
        top_iph->daddr = x->id.daddr.a4;
 
+       skb->protocol = htons(ETH_P_IP);
+
        memset(&(IPCB(skb)->opt), 0, sizeof(struct ip_options));
        return 0;
 }
 
 static int xfrm4_tunnel_input(struct xfrm_state *x, struct sk_buff *skb)
 {
-       struct iphdr *iph = skb->nh.iph;
+       struct iphdr *iph = ip_hdr(skb);
+       const unsigned char *old_mac;
        int err = -EINVAL;
 
-       switch(iph->protocol){
+       switch (iph->protocol){
                case IPPROTO_IPIP:
                        break;
 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
@@ -111,10 +110,10 @@ static int xfrm4_tunnel_input(struct xfrm_state *x, struct sk_buff *skb)
            (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
                goto out;
 
-       iph = skb->nh.iph;
+       iph = ip_hdr(skb);
        if (iph->protocol == IPPROTO_IPIP) {
                if (x->props.flags & XFRM_STATE_DECAP_DSCP)
-                       ipv4_copy_dscp(iph, skb->h.ipiph);
+                       ipv4_copy_dscp(iph, ipip_hdr(skb));
                if (!(x->props.flags & XFRM_STATE_NOECN))
                        ipip_ecn_decapsulate(skb);
        }
@@ -125,9 +124,10 @@ static int xfrm4_tunnel_input(struct xfrm_state *x, struct sk_buff *skb)
                skb->protocol = htons(ETH_P_IPV6);
        }
 #endif
-       skb->mac.raw = memmove(skb->data - skb->mac_len,
-                              skb->mac.raw, skb->mac_len);
-       skb->nh.raw = skb->data;
+       old_mac = skb_mac_header(skb);
+       skb_set_mac_header(skb, -skb->mac_len);
+       memmove(skb_mac_header(skb), old_mac, skb->mac_len);
+       skb_reset_network_header(skb);
        err = 0;
 
 out: