[IPV6]: Move nextheader offset to the IP6CB
Move nextheader offset to the IP6CB to make it possible to pass a
packet to ip6_input_finish multiple times and have it skip already
parsed headers. As a nice side effect this gets rid of the manual
hopopts skipping in ip6_input_finish.
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/ip6_input.c b/net/ipv6/ip6_input.c
index a6026d2..13d7241 100644
--- a/net/ipv6/ip6_input.c
+++ b/net/ipv6/ip6_input.c
@@ -97,6 +97,9 @@
if (hdr->version != 6)
goto err;
+ skb->h.raw = (u8 *)(hdr + 1);
+ IP6CB(skb)->nhoff = offsetof(struct ipv6hdr, nexthdr);
+
pkt_len = ntohs(hdr->payload_len);
/* pkt_len may be zero if Jumbo payload option is present */
@@ -111,8 +114,7 @@
}
if (hdr->nexthdr == NEXTHDR_HOP) {
- skb->h.raw = (u8*)(hdr+1);
- if (ipv6_parse_hopopts(skb, offsetof(struct ipv6hdr, nexthdr)) < 0) {
+ if (ipv6_parse_hopopts(skb, IP6CB(skb)->nhoff) < 0) {
IP6_INC_STATS_BH(IPSTATS_MIB_INHDRERRORS);
return 0;
}
@@ -143,26 +145,15 @@
int nexthdr;
u8 hash;
- skb->h.raw = skb->nh.raw + sizeof(struct ipv6hdr);
-
/*
* Parse extension headers
*/
- nexthdr = skb->nh.ipv6h->nexthdr;
- nhoff = offsetof(struct ipv6hdr, nexthdr);
-
- /* Skip hop-by-hop options, they are already parsed. */
- if (nexthdr == NEXTHDR_HOP) {
- nhoff = sizeof(struct ipv6hdr);
- nexthdr = skb->h.raw[0];
- skb->h.raw += (skb->h.raw[1]+1)<<3;
- }
-
rcu_read_lock();
resubmit:
if (!pskb_pull(skb, skb->h.raw - skb->data))
goto discard;
+ nhoff = IP6CB(skb)->nhoff;
nexthdr = skb->nh.raw[nhoff];
raw_sk = sk_head(&raw_v6_htable[nexthdr & (MAX_INET_PROTOS - 1)]);
@@ -194,7 +185,7 @@
!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
goto discard;
- ret = ipprot->handler(&skb, &nhoff);
+ ret = ipprot->handler(&skb);
if (ret > 0)
goto resubmit;
else if (ret == 0)
