[SCTP]: Fix the SO_REUSEADDR handling to be similar to TCP.

Update the SO_REUSEADDR handling to also check for listen state.  This
was muliple listening server sockets can't be created and they will
not steal packets from each other.

Reported by Paolo Galtieri <pgaltieri@mvista.com>

Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index b2ffab6..9f1a908 100644 (file)
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -5020,7 +5020,8 @@ pp_found:
                struct hlist_node *node;
 
                SCTP_DEBUG_PRINTK("sctp_get_port() found a possible match\n");
-               if (pp->fastreuse && sk->sk_reuse)
+               if (pp->fastreuse && sk->sk_reuse &&
+                       sk->sk_state != SCTP_SS_LISTENING)
                        goto success;
 
                /* Run through the list of sockets bound to the port
@@ -5037,7 +5038,8 @@ pp_found:
                        struct sctp_endpoint *ep2;
                        ep2 = sctp_sk(sk2)->ep;
 
-                       if (reuse && sk2->sk_reuse)
+                       if (reuse && sk2->sk_reuse &&
+                           sk2->sk_state != SCTP_SS_LISTENING)
                                continue;
 
                        if (sctp_bind_addr_match(&ep2->base.bind_addr, addr,
@@ -5058,9 +5060,13 @@ pp_not_found:
         * if sk->sk_reuse is too (that is, if the caller requested
         * SO_REUSEADDR on this socket -sk-).
         */
-       if (hlist_empty(&pp->owner))
-               pp->fastreuse = sk->sk_reuse ? 1 : 0;
-       else if (pp->fastreuse && !sk->sk_reuse)
+       if (hlist_empty(&pp->owner)) {
+               if (sk->sk_reuse && sk->sk_state != SCTP_SS_LISTENING)
+                       pp->fastreuse = 1;
+               else
+                       pp->fastreuse = 0;
+       } else if (pp->fastreuse &&
+               (!sk->sk_reuse || sk->sk_state == SCTP_SS_LISTENING))
                pp->fastreuse = 0;
 
        /* We are set, so fill up all the data in the hash table
@@ -5068,8 +5074,8 @@ pp_not_found:
         * sockets FIXME: Blurry, NPI (ipg).
         */
 success:
-       inet_sk(sk)->num = snum;
        if (!sctp_sk(sk)->bind_hash) {
+               inet_sk(sk)->num = snum;
                sk_add_bind_node(sk, &pp->owner);
                sctp_sk(sk)->bind_hash = pp;
        }
@@ -5142,12 +5148,16 @@ SCTP_STATIC int sctp_seqpacket_listen(struct sock *sk, int backlog)
         * This is not currently spelled out in the SCTP sockets
         * extensions draft, but follows the practice as seen in TCP
         * sockets.
+        *
+        * Additionally, turn off fastreuse flag since we are not listening
         */
+       sk->sk_state = SCTP_SS_LISTENING;
        if (!ep->base.bind_addr.port) {
                if (sctp_autobind(sk))
                        return -EAGAIN;
-       }
-       sk->sk_state = SCTP_SS_LISTENING;
+       } else
+               sctp_sk(sk)->bind_hash->fastreuse = 0;
+
        sctp_hash_endpoint(ep);
        return 0;
 }
@@ -5185,11 +5195,13 @@ SCTP_STATIC int sctp_stream_listen(struct sock *sk, int backlog)
         * extensions draft, but follows the practice as seen in TCP
         * sockets.
         */
+       sk->sk_state = SCTP_SS_LISTENING;
        if (!ep->base.bind_addr.port) {
                if (sctp_autobind(sk))
                        return -EAGAIN;
-       }
-       sk->sk_state = SCTP_SS_LISTENING;
+       } else
+               sctp_sk(sk)->bind_hash->fastreuse = 0;
+
        sk->sk_max_ack_backlog = backlog;
        sctp_hash_endpoint(ep);
        return 0;