[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/datagram.c b/net/ipv6/datagram.c
index 31a20f1..7a86db6 100644
--- a/net/ipv6/datagram.c
+++ b/net/ipv6/datagram.c
@@ -227,7 +227,8 @@
serr->ee.ee_pad = 0;
serr->ee.ee_info = info;
serr->ee.ee_data = 0;
- serr->addr_offset = (u8*)&(((struct ipv6hdr*)(icmph+1))->daddr) - skb->nh.raw;
+ serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) -
+ skb_network_header(skb);
serr->port = port;
skb->h.raw = payload;
@@ -264,7 +265,7 @@
serr->ee.ee_pad = 0;
serr->ee.ee_info = info;
serr->ee.ee_data = 0;
- serr->addr_offset = (u8*)&iph->daddr - skb->nh.raw;
+ serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
serr->port = fl->fl_ip_dport;
skb->h.raw = skb->tail;
@@ -310,21 +311,24 @@
sin = (struct sockaddr_in6 *)msg->msg_name;
if (sin) {
+ const unsigned char *nh = skb_network_header(skb);
sin->sin6_family = AF_INET6;
sin->sin6_flowinfo = 0;
sin->sin6_port = serr->port;
sin->sin6_scope_id = 0;
if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) {
ipv6_addr_copy(&sin->sin6_addr,
- (struct in6_addr *)(skb->nh.raw + serr->addr_offset));
+ (struct in6_addr *)(nh + serr->addr_offset));
if (np->sndflow)
- sin->sin6_flowinfo = *(__be32*)(skb->nh.raw + serr->addr_offset - 24) & IPV6_FLOWINFO_MASK;
+ sin->sin6_flowinfo =
+ (*(__be32 *)(nh + serr->addr_offset - 24) &
+ IPV6_FLOWINFO_MASK);
if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
sin->sin6_scope_id = IP6CB(skb)->iif;
} else {
ipv6_addr_set(&sin->sin6_addr, 0, 0,
htonl(0xffff),
- *(__be32*)(skb->nh.raw + serr->addr_offset));
+ *(__be32 *)(nh + serr->addr_offset));
}
}
@@ -382,6 +386,7 @@
{
struct ipv6_pinfo *np = inet6_sk(sk);
struct inet6_skb_parm *opt = IP6CB(skb);
+ unsigned char *nh = skb_network_header(skb);
if (np->rxopt.bits.rxinfo) {
struct in6_pktinfo src_info;
@@ -401,14 +406,14 @@
put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
}
- if (np->rxopt.bits.rxflow && (*(__be32*)skb->nh.raw & IPV6_FLOWINFO_MASK)) {
- __be32 flowinfo = *(__be32*)skb->nh.raw & IPV6_FLOWINFO_MASK;
+ if (np->rxopt.bits.rxflow && (*(__be32 *)nh & IPV6_FLOWINFO_MASK)) {
+ __be32 flowinfo = *(__be32 *)nh & IPV6_FLOWINFO_MASK;
put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
}
/* HbH is allowed only once */
if (np->rxopt.bits.hopopts && opt->hop) {
- u8 *ptr = skb->nh.raw + opt->hop;
+ u8 *ptr = nh + opt->hop;
put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
}
@@ -428,7 +433,7 @@
while (off <= opt->lastopt) {
unsigned len;
- u8 *ptr = skb->nh.raw + off;
+ u8 *ptr = nh + off;
switch(nexthdr) {
case IPPROTO_DSTOPTS:
@@ -470,19 +475,19 @@
put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
}
if (np->rxopt.bits.ohopopts && opt->hop) {
- u8 *ptr = skb->nh.raw + opt->hop;
+ u8 *ptr = nh + opt->hop;
put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
}
if (np->rxopt.bits.odstopts && opt->dst0) {
- u8 *ptr = skb->nh.raw + opt->dst0;
+ u8 *ptr = nh + opt->dst0;
put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
}
if (np->rxopt.bits.osrcrt && opt->srcrt) {
- struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(skb->nh.raw + opt->srcrt);
+ struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt);
put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
}
if (np->rxopt.bits.odstopts && opt->dst1) {
- u8 *ptr = skb->nh.raw + opt->dst1;
+ u8 *ptr = nh + opt->dst1;
put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
}
return 0;