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, 3 insertions, 3 deletions

diff --git a/net/ipv4/xfrm4_output.c b/net/ipv4/xfrm4_output.c
index 8c3180adddbf..c908bd99bcba 100644
--- a/net/ipv4/xfrm4_output.c
+++ b/net/ipv4/xfrm4_output.c
@@ -29,7 +29,7 @@ static int xfrm4_tunnel_check_size(struct sk_buff *skb)
         if (!(ip_hdr(skb)->frag_off & htons(IP_DF)) || skb->local_df)
                 goto out;
 
-        dst = skb->dst;
+        dst = skb_dst(skb);
         mtu = dst_mtu(dst);
         if (skb->len > mtu) {
                 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu));
@@ -72,7 +72,7 @@ EXPORT_SYMBOL(xfrm4_prepare_output);
 static int xfrm4_output_finish(struct sk_buff *skb)
 {
 #ifdef CONFIG_NETFILTER
-        if (!skb->dst->xfrm) {
+        if (!skb_dst(skb)->xfrm) {
                 IPCB(skb)->flags |= IPSKB_REROUTED;
                 return dst_output(skb);
         }
@@ -87,6 +87,6 @@ static int xfrm4_output_finish(struct sk_buff *skb)
 int xfrm4_output(struct sk_buff *skb)
 {
         return NF_HOOK_COND(PF_INET, NF_INET_POST_ROUTING, skb,
-                            NULL, skb->dst->dev, xfrm4_output_finish,
+                            NULL, skb_dst(skb)->dev, xfrm4_output_finish,
                             !(IPCB(skb)->flags & IPSKB_REROUTED));
 }