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>
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index a3ae3c5..9ef6eb2 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -323,7 +323,6 @@
struct net_device *dev;
union {
- struct dst_entry *dst;
unsigned long _skb_dst;
};
#ifdef CONFIG_XFRM
@@ -426,9 +425,19 @@
enum dma_data_direction dir);
#endif
+static inline struct dst_entry *skb_dst(const struct sk_buff *skb)
+{
+ return (struct dst_entry *)skb->_skb_dst;
+}
+
+static inline void skb_dst_set(struct sk_buff *skb, struct dst_entry *dst)
+{
+ skb->_skb_dst = (unsigned long)dst;
+}
+
static inline struct rtable *skb_rtable(const struct sk_buff *skb)
{
- return (struct rtable *)skb->_skb_dst;
+ return (struct rtable *)skb_dst(skb);
}
extern void kfree_skb(struct sk_buff *skb);
diff --git a/include/net/dst.h b/include/net/dst.h
index 6be3b08..7fc409c 100644
--- a/include/net/dst.h
+++ b/include/net/dst.h
@@ -195,6 +195,12 @@
}
extern void dst_release(struct dst_entry *dst);
+static inline void skb_dst_drop(struct sk_buff *skb)
+{
+ if (skb->_skb_dst)
+ dst_release(skb_dst(skb));
+ skb->_skb_dst = 0UL;
+}
/* Children define the path of the packet through the
* Linux networking. Thus, destinations are stackable.
@@ -246,7 +252,7 @@
static inline void dst_link_failure(struct sk_buff *skb)
{
- struct dst_entry * dst = skb->dst;
+ struct dst_entry *dst = skb_dst(skb);
if (dst && dst->ops && dst->ops->link_failure)
dst->ops->link_failure(skb);
}
@@ -265,13 +271,13 @@
/* Output packet to network from transport. */
static inline int dst_output(struct sk_buff *skb)
{
- return skb->dst->output(skb);
+ return skb_dst(skb)->output(skb);
}
/* Input packet from network to transport. */
static inline int dst_input(struct sk_buff *skb)
{
- return skb->dst->input(skb);
+ return skb_dst(skb)->input(skb);
}
static inline struct dst_entry *dst_check(struct dst_entry *dst, u32 cookie)
diff --git a/include/net/inet6_hashtables.h b/include/net/inet6_hashtables.h
index f74665d..22c73a7 100644
--- a/include/net/inet6_hashtables.h
+++ b/include/net/inet6_hashtables.h
@@ -100,7 +100,7 @@
if (unlikely(sk = skb_steal_sock(skb)))
return sk;
- else return __inet6_lookup(dev_net(skb->dst->dev), hashinfo,
+ else return __inet6_lookup(dev_net(skb_dst(skb)->dev), hashinfo,
&ipv6_hdr(skb)->saddr, sport,
&ipv6_hdr(skb)->daddr, ntohs(dport),
inet6_iif(skb));
diff --git a/include/net/inet_hashtables.h b/include/net/inet_hashtables.h
index a44e224..d522dcf 100644
--- a/include/net/inet_hashtables.h
+++ b/include/net/inet_hashtables.h
@@ -385,7 +385,7 @@
if (unlikely(sk = skb_steal_sock(skb)))
return sk;
else
- return __inet_lookup(dev_net(skb->dst->dev), hashinfo,
+ return __inet_lookup(dev_net(skb_dst(skb)->dev), hashinfo,
iph->saddr, sport,
iph->daddr, dport, inet_iif(skb));
}
diff --git a/include/net/ip6_route.h b/include/net/ip6_route.h
index 5f53db7..0e1b8ae 100644
--- a/include/net/ip6_route.h
+++ b/include/net/ip6_route.h
@@ -142,7 +142,7 @@
static inline int ipv6_unicast_destination(struct sk_buff *skb)
{
- struct rt6_info *rt = (struct rt6_info *) skb->dst;
+ struct rt6_info *rt = (struct rt6_info *) skb_dst(skb);
return rt->rt6i_flags & RTF_LOCAL;
}
diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index 2e9f5c0..736bca4 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -994,7 +994,7 @@
return __xfrm_policy_check(sk, ndir, skb, family);
return (!net->xfrm.policy_count[dir] && !skb->sp) ||
- (skb->dst->flags & DST_NOPOLICY) ||
+ (skb_dst(skb)->flags & DST_NOPOLICY) ||
__xfrm_policy_check(sk, ndir, skb, family);
}
@@ -1048,7 +1048,7 @@
struct net *net = dev_net(skb->dev);
return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
- (skb->dst->flags & DST_NOXFRM) ||
+ (skb_dst(skb)->flags & DST_NOXFRM) ||
__xfrm_route_forward(skb, family);
}