- *dst = NULL;
- if (sk) {
- struct ipv6_pinfo *np = inet6_sk(sk);
-
- *dst = sk_dst_check(sk, np->dst_cookie);
- if (*dst) {
- struct rt6_info *rt = (struct rt6_info*)*dst;
-
- /* Yes, checking route validity in not connected
- case is not very simple. Take into account,
- that we do not support routing by source, TOS,
- and MSG_DONTROUTE --ANK (980726)
-
- 1. If route was host route, check that
- cached destination is current.
- If it is network route, we still may
- check its validity using saved pointer
- to the last used address: daddr_cache.
- We do not want to save whole address now,
- (because main consumer of this service
- is tcp, which has not this problem),
- so that the last trick works only on connected
- sockets.
- 2. oif also should be the same.
- */
-
- if (((rt->rt6i_dst.plen != 128 ||
- !ipv6_addr_equal(&fl->fl6_dst, &rt->rt6i_dst.addr))
- && (np->daddr_cache == NULL ||
- !ipv6_addr_equal(&fl->fl6_dst, np->daddr_cache)))
- || (fl->oif && fl->oif != (*dst)->dev->ifindex)) {
- dst_release(*dst);
- *dst = NULL;
- }
- }
+static struct dst_entry *ip6_sk_dst_check(struct sock *sk,
+ struct dst_entry *dst,
+ struct flowi *fl)
+{
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ struct rt6_info *rt = (struct rt6_info *)dst;
+
+ if (!dst)
+ goto out;
+
+ /* Yes, checking route validity in not connected
+ * case is not very simple. Take into account,
+ * that we do not support routing by source, TOS,
+ * and MSG_DONTROUTE --ANK (980726)
+ *
+ * 1. ip6_rt_check(): If route was host route,
+ * check that cached destination is current.
+ * If it is network route, we still may
+ * check its validity using saved pointer
+ * to the last used address: daddr_cache.
+ * We do not want to save whole address now,
+ * (because main consumer of this service
+ * is tcp, which has not this problem),
+ * so that the last trick works only on connected
+ * sockets.
+ * 2. oif also should be the same.
+ */
+ if (ip6_rt_check(&rt->rt6i_dst, &fl->fl6_dst, np->daddr_cache) ||
+#ifdef CONFIG_IPV6_SUBTREES
+ ip6_rt_check(&rt->rt6i_src, &fl->fl6_src, np->saddr_cache) ||
+#endif
+ (fl->oif && fl->oif != dst->dev->ifindex)) {
+ dst_release(dst);
+ dst = NULL;