[SK_BUFF]: Introduce skb_reset_network_header(skb)

For the common, open coded 'skb->nh.raw = skb->data' operation, so that we can
later turn skb->nh.raw into a offset, reducing the size of struct sk_buff in
64bit land while possibly keeping it as a pointer on 32bit.

This one touches just the most simple case, next will handle the slightly more
"complex" cases.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

6 files changed, 12 insertions, 12 deletions

diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index a5f4562b5d29..4406546d3ce8 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -735,7 +735,7 @@ slow_path:
                 ip6_copy_metadata(frag, skb);
                 skb_reserve(frag, LL_RESERVED_SPACE(rt->u.dst.dev));
                 skb_put(frag, len + hlen + sizeof(struct frag_hdr));
-                frag->nh.raw = frag->data;
+                skb_reset_network_header(frag);
                 fh = (struct frag_hdr*)(frag->data + hlen);
                 frag->h.raw = frag->data + hlen + sizeof(struct frag_hdr);
 
@@ -976,7 +976,7 @@ static inline int ip6_ufo_append_data(struct sock *sk,
                 skb_put(skb,fragheaderlen + transhdrlen);
 
                 /* initialize network header pointer */
-                skb->nh.raw = skb->data;
+                skb_reset_network_header(skb);
 
                 /* initialize protocol header pointer */
                 skb->h.raw = skb->data + fragheaderlen;
diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c
index d8c84d8d7cf8..30df8e6c42cc 100644
--- a/net/ipv6/ip6_tunnel.c
+++ b/net/ipv6/ip6_tunnel.c
@@ -525,7 +525,7 @@ ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
         dst_release(skb2->dst);
         skb2->dst = NULL;
         skb_pull(skb2, offset);
-        skb2->nh.raw = skb2->data;
+        skb_reset_network_header(skb2);
         eiph = skb2->nh.iph;
 
         /* Try to guess incoming interface */
@@ -599,7 +599,7 @@ ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
                 dst_release(skb2->dst);
                 skb2->dst = NULL;
                 skb_pull(skb2, offset);
-                skb2->nh.raw = skb2->data;
+                skb_reset_network_header(skb2);
 
                 /* Try to guess incoming interface */
                 rt = rt6_lookup(&skb2->nh.ipv6h->saddr, NULL, 0, 0);
@@ -704,7 +704,7 @@ static int ip6_tnl_rcv(struct sk_buff *skb, __u16 protocol,
                 }
                 secpath_reset(skb);
                 skb->mac.raw = skb->nh.raw;
-                skb->nh.raw = skb->data;
+                skb_reset_network_header(skb);
                 skb->protocol = htons(protocol);
                 skb->pkt_type = PACKET_HOST;
                 memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
index 08d6ed3396e4..0477728578fe 100644
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -340,7 +340,7 @@ out:
         dst_release(skb2->dst);
         skb2->dst = NULL;
         skb_pull(skb2, skb->data - (u8*)iph6);
-        skb2->nh.raw = skb2->data;
+        skb_reset_network_header(skb2);
 
         /* Try to guess incoming interface */
         rt6i = rt6_lookup(&iph6->saddr, NULL, NULL, 0);
@@ -383,7 +383,7 @@ static int ipip6_rcv(struct sk_buff *skb)
         if ((tunnel = ipip6_tunnel_lookup(iph->saddr, iph->daddr)) != NULL) {
                 secpath_reset(skb);
                 skb->mac.raw = skb->nh.raw;
-                skb->nh.raw = skb->data;
+                skb_reset_network_header(skb);
                 IPCB(skb)->flags = 0;
                 skb->protocol = htons(ETH_P_IPV6);
                 skb->pkt_type = PACKET_HOST;
diff --git a/net/ipv6/xfrm6_mode_beet.c b/net/ipv6/xfrm6_mode_beet.c
index 79364b1e965a..c015bfde2b1c 100644
--- a/net/ipv6/xfrm6_mode_beet.c
+++ b/net/ipv6/xfrm6_mode_beet.c
@@ -45,7 +45,7 @@ static int xfrm6_beet_output(struct xfrm_state *x, struct sk_buff *skb)
         skb->h.raw = skb->data + hdr_len;
         memmove(skb->data, iph, hdr_len);
 
-        skb->nh.raw = skb->data;
+        skb_reset_network_header(skb);
         top_iph = skb->nh.ipv6h;
         skb->nh.raw = &top_iph->nexthdr;
         skb->h.ipv6h = top_iph + 1;
@@ -68,7 +68,7 @@ static int xfrm6_beet_input(struct xfrm_state *x, struct sk_buff *skb)
 
         skb_push(skb, size);
         memmove(skb->data, skb->nh.raw, size);
-        skb->nh.raw = skb->data;
+        skb_reset_network_header(skb);
 
         old_mac = skb_mac_header(skb);
         skb_set_mac_header(skb, -skb->mac_len);
diff --git a/net/ipv6/xfrm6_mode_tunnel.c b/net/ipv6/xfrm6_mode_tunnel.c
index 5bb0677d3730..8ce5ef2d0b1c 100644
--- a/net/ipv6/xfrm6_mode_tunnel.c
+++ b/net/ipv6/xfrm6_mode_tunnel.c
@@ -53,7 +53,7 @@ static int xfrm6_tunnel_output(struct xfrm_state *x, struct sk_buff *skb)
         skb_push(skb, x->props.header_len);
         iph = skb->nh.ipv6h;
 
-        skb->nh.raw = skb->data;
+        skb_reset_network_header(skb);
         top_iph = skb->nh.ipv6h;
         skb->nh.raw = &top_iph->nexthdr;
         skb->h.ipv6h = top_iph + 1;
@@ -111,7 +111,7 @@ static int xfrm6_tunnel_input(struct xfrm_state *x, struct sk_buff *skb)
         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->nh.raw = skb->data;
+        skb_reset_network_header(skb);
         err = 0;
 
 out:
diff --git a/net/ipv6/xfrm6_output.c b/net/ipv6/xfrm6_output.c
index c52e9d6c75ec..56364a5f676a 100644
--- a/net/ipv6/xfrm6_output.c
+++ b/net/ipv6/xfrm6_output.c
@@ -82,7 +82,7 @@ static int xfrm6_output_one(struct sk_buff *skb)
 
                 spin_unlock_bh(&x->lock);
 
-                skb->nh.raw = skb->data;
+                skb_reset_network_header(skb);
 
                 if (!(skb->dst = dst_pop(dst))) {
                         err = -EHOSTUNREACH;