[SK_BUFF]: Introduce skb_network_header_len

For the common sequence "skb->h.raw - skb->nh.raw", similar to skb->mac_len,
that is precalculated tho, don't think we need to bloat skb with one more
member, so just use this new helper, reducing the number of non-skbuff.h
references to the layer headers even more.

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

1 files changed, 5 insertions, 3 deletions

diff --git a/net/ipv6/reassembly.c b/net/ipv6/reassembly.c
index 31d4271ea540..6dfacfa7a599 100644
--- a/net/ipv6/reassembly.c
+++ b/net/ipv6/reassembly.c
@@ -679,7 +679,7 @@ static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff **skb_in,
         /* Yes, and fold redundant checksum back. 8) */
         if (head->ip_summed == CHECKSUM_COMPLETE)
                 head->csum = csum_partial(skb_network_header(head),
-                                          head->h.raw - head->nh.raw,
+                                          skb_network_header_len(head),
                                           head->csum);
 
         rcu_read_lock();
@@ -715,13 +715,15 @@ static int ipv6_frag_rcv(struct sk_buff **skbp)
         /* Jumbo payload inhibits frag. header */
         if (hdr->payload_len==0) {
                 IP6_INC_STATS(ip6_dst_idev(skb->dst), IPSTATS_MIB_INHDRERRORS);
-                icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, skb->h.raw-skb->nh.raw);
+                icmpv6_param_prob(skb, ICMPV6_HDR_FIELD,
+                                  skb_network_header_len(skb));
                 return -1;
         }
         if (!pskb_may_pull(skb, (skb_transport_offset(skb) +
                                  sizeof(struct frag_hdr)))) {
                 IP6_INC_STATS(ip6_dst_idev(skb->dst), IPSTATS_MIB_INHDRERRORS);
-                icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, skb->h.raw-skb->nh.raw);
+                icmpv6_param_prob(skb, ICMPV6_HDR_FIELD,
+                                  skb_network_header_len(skb));
                 return -1;
         }