[SK_BUFF]: Introduce skb_reset_transport_header(skb)

For the common, open coded 'skb->h.raw = skb->data' operation, so that we can
later turn skb->h.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 cases:

skb->h.raw = skb->data;
skb->h.raw = {skb_push|[__]skb_pull}()

The next ones 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, 10 insertions, 10 deletions

diff --git a/net/ipv6/ip6_input.c b/net/ipv6/ip6_input.c
index 9c3c787a21c1..2dd32a2ca056 100644
--- a/net/ipv6/ip6_input.c
+++ b/net/ipv6/ip6_input.c
@@ -101,7 +101,7 @@ int ipv6_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt
         if (hdr->version != 6)
                 goto err;
 
-        skb->h.raw = (u8 *)(hdr + 1);
+        skb->h.raw = skb->nh.raw + sizeof(*hdr);
         IP6CB(skb)->nhoff = offsetof(struct ipv6hdr, nexthdr);
 
         pkt_len = ntohs(hdr->payload_len);
diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index 1900c6226866..0f4434eff66a 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -654,7 +654,7 @@ static int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *))
                          * before previous one went down. */
                         if (frag) {
                                 frag->ip_summed = CHECKSUM_NONE;
-                                frag->h.raw = frag->data;
+                                skb_reset_transport_header(frag);
                                 fh = (struct frag_hdr*)__skb_push(frag, sizeof(struct frag_hdr));
                                 __skb_push(frag, hlen);
                                 skb_reset_network_header(frag);
@@ -747,8 +747,8 @@ slow_path:
                 skb_reserve(frag, LL_RESERVED_SPACE(rt->u.dst.dev));
                 skb_put(frag, len + hlen + sizeof(struct frag_hdr));
                 skb_reset_network_header(frag);
-                fh = (struct frag_hdr*)(frag->data + hlen);
-                frag->h.raw = frag->data + hlen + sizeof(struct frag_hdr);
+                fh = (struct frag_hdr *)(skb_network_header(frag) + hlen);
+                frag->h.raw = frag->nh.raw + hlen + sizeof(struct frag_hdr);
 
                 /*
                  *      Charge the memory for the fragment to any owner
@@ -991,7 +991,7 @@ static inline int ip6_ufo_append_data(struct sock *sk,
                 skb_reset_network_header(skb);
 
                 /* initialize protocol header pointer */
-                skb->h.raw = skb->data + fragheaderlen;
+                skb->h.raw = skb->nh.raw + fragheaderlen;
 
                 skb->ip_summed = CHECKSUM_PARTIAL;
                 skb->csum = 0;
diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c
index d16e0fd2cd89..da930fa089c9 100644
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c
@@ -108,7 +108,7 @@ static int ipv6_gso_send_check(struct sk_buff *skb)
         rcu_read_lock();
         ops = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
         if (likely(ops && ops->gso_send_check)) {
-                skb->h.raw = skb->data;
+                skb_reset_transport_header(skb);
                 err = ops->gso_send_check(skb);
         }
         rcu_read_unlock();
@@ -144,7 +144,7 @@ static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, int features)
         rcu_read_lock();
         ops = ipv6_gso_pull_exthdrs(skb, ipv6h->nexthdr);
         if (likely(ops && ops->gso_segment)) {
-                skb->h.raw = skb->data;
+                skb_reset_transport_header(skb);
                 segs = ops->gso_segment(skb, features);
         }
         rcu_read_unlock();
diff --git a/net/ipv6/netfilter/nf_conntrack_reasm.c b/net/ipv6/netfilter/nf_conntrack_reasm.c
index d3fbb1f1caf5..75138cf1fa61 100644
--- a/net/ipv6/netfilter/nf_conntrack_reasm.c
+++ b/net/ipv6/netfilter/nf_conntrack_reasm.c
@@ -634,7 +634,7 @@ nf_ct_frag6_reasm(struct nf_ct_frag6_queue *fq, struct net_device *dev)
         head->nh.raw += sizeof(struct frag_hdr);
 
         skb_shinfo(head)->frag_list = head->next;
-        head->h.raw = head->data;
+        skb_reset_transport_header(head);
         skb_push(head, head->data - skb_network_header(head));
         atomic_sub(head->truesize, &nf_ct_frag6_mem);
 
diff --git a/net/ipv6/reassembly.c b/net/ipv6/reassembly.c
index 156a37fe3ff3..2594f0fb290d 100644
--- a/net/ipv6/reassembly.c
+++ b/net/ipv6/reassembly.c
@@ -653,7 +653,7 @@ static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff **skb_in,
         head->nh.raw += sizeof(struct frag_hdr);
 
         skb_shinfo(head)->frag_list = head->next;
-        head->h.raw = head->data;
+        skb_reset_transport_header(head);
         skb_push(head, head->data - skb_network_header(head));
         atomic_sub(head->truesize, &ip6_frag_mem);
 
diff --git a/net/ipv6/xfrm6_mode_transport.c b/net/ipv6/xfrm6_mode_transport.c
index 358b60d9d912..cae6cacd58c4 100644
--- a/net/ipv6/xfrm6_mode_transport.c
+++ b/net/ipv6/xfrm6_mode_transport.c
@@ -59,7 +59,7 @@ static int xfrm6_transport_input(struct xfrm_state *x, struct sk_buff *skb)
         }
         ipv6_hdr(skb)->payload_len = htons(skb->len + ihl -
                                            sizeof(struct ipv6hdr));
-        skb->h.raw = skb->data;
+        skb_reset_transport_header(skb);
         return 0;
 }