ipv6: Add helper inet6_csk_update_pmtu().

This is the ipv6 version of inet_csk_update_pmtu().

Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/net/inet6_connection_sock.h b/include/net/inet6_connection_sock.h
index df2a857..04642c9 100644 (file)
--- a/include/net/inet6_connection_sock.h
+++ b/include/net/inet6_connection_sock.h
@@ -43,4 +43,6 @@ extern void inet6_csk_reqsk_queue_hash_add(struct sock *sk,
 extern void inet6_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr);
 
 extern int inet6_csk_xmit(struct sk_buff *skb, struct flowi *fl);
+
+extern struct dst_entry *inet6_csk_update_pmtu(struct sock *sk, u32 mtu);
 #endif /* _INET6_CONNECTION_SOCK_H */

diff --git a/net/dccp/ipv6.c b/net/dccp/ipv6.c
index 090c080..3ee0342 100644 (file)
--- a/net/dccp/ipv6.c
+++ b/net/dccp/ipv6.c
@@ -145,39 +145,12 @@ static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
                if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED))
                        goto out;
 
-               /* icmp should have updated the destination cache entry */
-               dst = __sk_dst_check(sk, np->dst_cookie);
-               if (dst == NULL) {
-                       struct inet_sock *inet = inet_sk(sk);
-                       struct flowi6 fl6;
-
-                       /* BUGGG_FUTURE: Again, it is not clear how
-                          to handle rthdr case. Ignore this complexity
-                          for now.
-                        */
-                       memset(&fl6, 0, sizeof(fl6));
-                       fl6.flowi6_proto = IPPROTO_DCCP;
-                       fl6.daddr = np->daddr;
-                       fl6.saddr = np->saddr;
-                       fl6.flowi6_oif = sk->sk_bound_dev_if;
-                       fl6.fl6_dport = inet->inet_dport;
-                       fl6.fl6_sport = inet->inet_sport;
-                       security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
-
-                       dst = ip6_dst_lookup_flow(sk, &fl6, NULL, false);
-                       if (IS_ERR(dst)) {
-                               sk->sk_err_soft = -PTR_ERR(dst);
-                               goto out;
-                       }
-               } else
-                       dst_hold(dst);
-
-               dst->ops->update_pmtu(dst, ntohl(info));
+               dst = inet6_csk_update_pmtu(sk, ntohl(info));
+               if (!dst)
+                       goto out;
 
-               if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
+               if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst))
                        dccp_sync_mss(sk, dst_mtu(dst));
-               } /* else let the usual retransmit timer handle it */
-               dst_release(dst);
                goto out;
        }
 

diff --git a/net/ipv6/inet6_connection_sock.c b/net/ipv6/inet6_connection_sock.c
index bceb144..62539a4 100644 (file)
--- a/net/ipv6/inet6_connection_sock.c
+++ b/net/ipv6/inet6_connection_sock.c
@@ -203,15 +203,13 @@ struct dst_entry *__inet6_csk_dst_check(struct sock *sk, u32 cookie)
        return dst;
 }
 
-int inet6_csk_xmit(struct sk_buff *skb, struct flowi *fl_unused)
+static struct dst_entry *inet6_csk_route_socket(struct sock *sk)
 {
-       struct sock *sk = skb->sk;
        struct inet_sock *inet = inet_sk(sk);
        struct ipv6_pinfo *np = inet6_sk(sk);
-       struct flowi6 fl6;
-       struct dst_entry *dst;
        struct in6_addr *final_p, final;
-       int res;
+       struct dst_entry *dst;
+       struct flowi6 fl6;
 
        memset(&fl6, 0, sizeof(fl6));
        fl6.flowi6_proto = sk->sk_protocol;
@@ -228,18 +226,29 @@ int inet6_csk_xmit(struct sk_buff *skb, struct flowi *fl_unused)
        final_p = fl6_update_dst(&fl6, np->opt, &final);
 
        dst = __inet6_csk_dst_check(sk, np->dst_cookie);
-
-       if (dst == NULL) {
+       if (!dst) {
                dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false);
 
-               if (IS_ERR(dst)) {
-                       sk->sk_err_soft = -PTR_ERR(dst);
-                       sk->sk_route_caps = 0;
-                       kfree_skb(skb);
-                       return PTR_ERR(dst);
-               }
+               if (!IS_ERR(dst))
+                       __inet6_csk_dst_store(sk, dst, NULL, NULL);
+       }
+       return dst;
+}
 
-               __inet6_csk_dst_store(sk, dst, NULL, NULL);
+int inet6_csk_xmit(struct sk_buff *skb, struct flowi *fl_unused)
+{
+       struct sock *sk = skb->sk;
+       struct ipv6_pinfo *np = inet6_sk(sk);
+       struct flowi6 fl6;
+       struct dst_entry *dst;
+       int res;
+
+       dst = inet6_csk_route_socket(sk);
+       if (IS_ERR(dst)) {
+               sk->sk_err_soft = -PTR_ERR(dst);
+               sk->sk_route_caps = 0;
+               kfree_skb(skb);
+               return PTR_ERR(dst);
        }
 
        rcu_read_lock();
@@ -253,3 +262,15 @@ int inet6_csk_xmit(struct sk_buff *skb, struct flowi *fl_unused)
        return res;
 }
 EXPORT_SYMBOL_GPL(inet6_csk_xmit);
+
+struct dst_entry *inet6_csk_update_pmtu(struct sock *sk, u32 mtu)
+{
+       struct dst_entry *dst = inet6_csk_route_socket(sk);
+
+       if (IS_ERR(dst))
+               return NULL;
+       dst->ops->update_pmtu(dst, mtu);
+
+       return inet6_csk_route_socket(sk);
+}
+EXPORT_SYMBOL_GPL(inet6_csk_update_pmtu);

diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 3071f37..ecdf241 100644 (file)
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -378,43 +378,14 @@ static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
                if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE))
                        goto out;
 
-               /* icmp should have updated the destination cache entry */
-               dst = __sk_dst_check(sk, np->dst_cookie);
-
-               if (dst == NULL) {
-                       struct inet_sock *inet = inet_sk(sk);
-                       struct flowi6 fl6;
-
-                       /* BUGGG_FUTURE: Again, it is not clear how
-                          to handle rthdr case. Ignore this complexity
-                          for now.
-                        */
-                       memset(&fl6, 0, sizeof(fl6));
-                       fl6.flowi6_proto = IPPROTO_TCP;
-                       fl6.daddr = np->daddr;
-                       fl6.saddr = np->saddr;
-                       fl6.flowi6_oif = sk->sk_bound_dev_if;
-                       fl6.flowi6_mark = sk->sk_mark;
-                       fl6.fl6_dport = inet->inet_dport;
-                       fl6.fl6_sport = inet->inet_sport;
-                       security_skb_classify_flow(skb, flowi6_to_flowi(&fl6));
-
-                       dst = ip6_dst_lookup_flow(sk, &fl6, NULL, false);
-                       if (IS_ERR(dst)) {
-                               sk->sk_err_soft = -PTR_ERR(dst);
-                               goto out;
-                       }
-
-               } else
-                       dst_hold(dst);
-
-               dst->ops->update_pmtu(dst, ntohl(info));
+               dst = inet6_csk_update_pmtu(sk, ntohl(info));
+               if (!dst)
+                       goto out;
 
                if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
                        tcp_sync_mss(sk, dst_mtu(dst));
                        tcp_simple_retransmit(sk);
-               } /* else let the usual retransmit timer handle it */
-               dst_release(dst);
+               }
                goto out;
        }