net: skb->dst accessors

Define three accessors to get/set dst attached to a skb

struct dst_entry *skb_dst(const struct sk_buff *skb)

void skb_dst_set(struct sk_buff *skb, struct dst_entry *dst)

void skb_dst_drop(struct sk_buff *skb)
This one should replace occurrences of :
dst_release(skb->dst)
skb->dst = NULL;

Delete skb->dst field

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 6 deletions

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 032a5ec391c5..658293ea05ba 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -800,7 +800,7 @@ void ip6_route_input(struct sk_buff *skb)
         if (rt6_need_strict(&iph->daddr) && skb->dev->type != ARPHRD_PIMREG)
                 flags |= RT6_LOOKUP_F_IFACE;
 
-        skb->dst = fib6_rule_lookup(net, &fl, flags, ip6_pol_route_input);
+        skb_dst_set(skb, fib6_rule_lookup(net, &fl, flags, ip6_pol_route_input));
 }
 
 static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table,
@@ -911,7 +911,7 @@ static void ip6_link_failure(struct sk_buff *skb)
 
         icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0, skb->dev);
 
-        rt = (struct rt6_info *) skb->dst;
+        rt = (struct rt6_info *) skb_dst(skb);
         if (rt) {
                 if (rt->rt6i_flags&RTF_CACHE) {
                         dst_set_expires(&rt->u.dst, 0);
@@ -1868,7 +1868,7 @@ int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
 static int ip6_pkt_drop(struct sk_buff *skb, int code, int ipstats_mib_noroutes)
 {
         int type;
-        struct dst_entry *dst = skb->dst;
+        struct dst_entry *dst = skb_dst(skb);
         switch (ipstats_mib_noroutes) {
         case IPSTATS_MIB_INNOROUTES:
                 type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
@@ -1895,7 +1895,7 @@ static int ip6_pkt_discard(struct sk_buff *skb)
 
 static int ip6_pkt_discard_out(struct sk_buff *skb)
 {
-        skb->dev = skb->dst->dev;
+        skb->dev = skb_dst(skb)->dev;
         return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
 }
 
@@ -1908,7 +1908,7 @@ static int ip6_pkt_prohibit(struct sk_buff *skb)
 
 static int ip6_pkt_prohibit_out(struct sk_buff *skb)
 {
-        skb->dev = skb->dst->dev;
+        skb->dev = skb_dst(skb)->dev;
         return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
 }
 
@@ -2366,7 +2366,7 @@ static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void
         skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
 
         rt = (struct rt6_info*) ip6_route_output(net, NULL, &fl);
-        skb->dst = &rt->u.dst;
+        skb_dst_set(skb, &rt->u.dst);
 
         err = rt6_fill_node(net, skb, rt, &fl.fl6_dst, &fl.fl6_src, iif,
                             RTM_NEWROUTE, NETLINK_CB(in_skb).pid,