[SK_BUFF]: Introduce skb_transport_offset()
For the quite common 'skb->h.raw - skb->data' sequence.
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/exthdrs.c b/net/ipv6/exthdrs.c
index dab069b..1bda029 100644
--- a/net/ipv6/exthdrs.c
+++ b/net/ipv6/exthdrs.c
@@ -146,7 +146,7 @@
int off = skb->h.raw - skb->nh.raw;
int len = ((skb->h.raw[1]+1)<<3);
- if ((skb->h.raw + len) - skb->data > skb_headlen(skb))
+ if (skb_transport_offset(skb) + len > skb_headlen(skb))
goto bad;
off += 2;
@@ -288,8 +288,9 @@
#endif
struct dst_entry *dst;
- if (!pskb_may_pull(skb, (skb->h.raw-skb->data)+8) ||
- !pskb_may_pull(skb, (skb->h.raw-skb->data)+((skb->h.raw[1]+1)<<3))) {
+ if (!pskb_may_pull(skb, skb_transport_offset(skb) + 8) ||
+ !pskb_may_pull(skb, (skb_transport_offset(skb) +
+ ((skb->h.raw[1] + 1) << 3)))) {
IP6_INC_STATS_BH(ip6_dst_idev(skb->dst),
IPSTATS_MIB_INHDRERRORS);
kfree_skb(skb);
@@ -387,8 +388,9 @@
in6_dev_put(idev);
- if (!pskb_may_pull(skb, (skb->h.raw-skb->data)+8) ||
- !pskb_may_pull(skb, (skb->h.raw-skb->data)+((skb->h.raw[1]+1)<<3))) {
+ if (!pskb_may_pull(skb, skb_transport_offset(skb) + 8) ||
+ !pskb_may_pull(skb, (skb_transport_offset(skb) +
+ ((skb->h.raw[1] + 1) << 3)))) {
IP6_INC_STATS_BH(ip6_dst_idev(skb->dst),
IPSTATS_MIB_INHDRERRORS);
kfree_skb(skb);