[SK_BUFF]: Introduce skb_network_header()
For the places where we need a pointer to the network header, it is still legal
to touch skb->nh.raw directly if just adding to, subtracting from or setting it
to another layer header.
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/mip6.c b/net/ipv6/mip6.c
index 0afcabd..bb40335 100644
--- a/net/ipv6/mip6.c
+++ b/net/ipv6/mip6.c
@@ -99,14 +99,16 @@
if (mh->ip6mh_hdrlen < mip6_mh_len(mh->ip6mh_type)) {
LIMIT_NETDEBUG(KERN_DEBUG "mip6: MH message too short: %d vs >=%d\n",
mh->ip6mh_hdrlen, mip6_mh_len(mh->ip6mh_type));
- mip6_param_prob(skb, 0, (&mh->ip6mh_hdrlen) - skb->nh.raw);
+ mip6_param_prob(skb, 0, ((&mh->ip6mh_hdrlen) -
+ skb_network_header(skb)));
return -1;
}
if (mh->ip6mh_proto != IPPROTO_NONE) {
LIMIT_NETDEBUG(KERN_DEBUG "mip6: MH invalid payload proto = %d\n",
mh->ip6mh_proto);
- mip6_param_prob(skb, 0, (&mh->ip6mh_proto) - skb->nh.raw);
+ mip6_param_prob(skb, 0, ((&mh->ip6mh_proto) -
+ skb_network_header(skb)));
return -1;
}
@@ -152,8 +154,8 @@
iph = (struct ipv6hdr *)skb->data;
iph->payload_len = htons(skb->len - sizeof(*iph));
- nexthdr = *skb->nh.raw;
- *skb->nh.raw = IPPROTO_DSTOPTS;
+ nexthdr = *skb_network_header(skb);
+ *skb_network_header(skb) = IPPROTO_DSTOPTS;
dstopt = (struct ipv6_destopt_hdr *)skb->h.raw;
dstopt->nexthdr = nexthdr;
@@ -215,7 +217,8 @@
if (likely(opt->dsthao)) {
offset = ipv6_find_tlv(skb, opt->dsthao, IPV6_TLV_HAO);
if (likely(offset >= 0))
- hao = (struct ipv6_destopt_hao *)(skb->nh.raw + offset);
+ hao = (struct ipv6_destopt_hao *)
+ (skb_network_header(skb) + offset);
}
skb_get_timestamp(skb, &stamp);
@@ -254,7 +257,8 @@
{
u16 offset = sizeof(struct ipv6hdr);
struct ipv6_opt_hdr *exthdr = (struct ipv6_opt_hdr*)(skb->nh.ipv6h + 1);
- unsigned int packet_len = skb->tail - skb->nh.raw;
+ const unsigned char *nh = skb_network_header(skb);
+ unsigned int packet_len = skb->tail - nh;
int found_rhdr = 0;
*nexthdr = &skb->nh.ipv6h->nexthdr;
@@ -288,7 +292,7 @@
offset += ipv6_optlen(exthdr);
*nexthdr = &exthdr->nexthdr;
- exthdr = (struct ipv6_opt_hdr*)(skb->nh.raw + offset);
+ exthdr = (struct ipv6_opt_hdr *)(nh + offset);
}
return offset;
@@ -361,8 +365,8 @@
iph = (struct ipv6hdr *)skb->data;
iph->payload_len = htons(skb->len - sizeof(*iph));
- nexthdr = *skb->nh.raw;
- *skb->nh.raw = IPPROTO_ROUTING;
+ nexthdr = *skb_network_header(skb);
+ *skb_network_header(skb) = IPPROTO_ROUTING;
rt2 = (struct rt2_hdr *)skb->h.raw;
rt2->rt_hdr.nexthdr = nexthdr;
@@ -384,7 +388,8 @@
{
u16 offset = sizeof(struct ipv6hdr);
struct ipv6_opt_hdr *exthdr = (struct ipv6_opt_hdr*)(skb->nh.ipv6h + 1);
- unsigned int packet_len = skb->tail - skb->nh.raw;
+ const unsigned char *nh = skb_network_header(skb);
+ unsigned int packet_len = skb->tail - nh;
int found_rhdr = 0;
*nexthdr = &skb->nh.ipv6h->nexthdr;
@@ -397,7 +402,7 @@
case NEXTHDR_ROUTING:
if (offset + 3 <= packet_len) {
struct ipv6_rt_hdr *rt;
- rt = (struct ipv6_rt_hdr *)(skb->nh.raw + offset);
+ rt = (struct ipv6_rt_hdr *)(nh + offset);
if (rt->type != 0)
return offset;
}
@@ -417,7 +422,7 @@
offset += ipv6_optlen(exthdr);
*nexthdr = &exthdr->nexthdr;
- exthdr = (struct ipv6_opt_hdr*)(skb->nh.raw + offset);
+ exthdr = (struct ipv6_opt_hdr *)(nh + offset);
}
return offset;