[SCTP] Support SO_BINDTODEVICE socket option on incoming packets.
Neil Horman [Mon, 13 Jun 2005 22:11:24 +0000 (15:11 -0700)]
Signed-off-by: Neil Horman <nhorman@redhat.com>
Signed-off-by: Sridhar Samudrala <sri@us.ibm.com
Signed-off-by: David S. Miller <davem@davemloft.net>

net/sctp/input.c

index b719a77..fffc880 100644 (file)
@@ -178,6 +178,37 @@ int sctp_rcv(struct sk_buff *skb)
 
        asoc = __sctp_rcv_lookup(skb, &src, &dest, &transport);
 
+       if (!asoc)
+               ep = __sctp_rcv_lookup_endpoint(&dest);
+
+       /* Retrieve the common input handling substructure. */
+       rcvr = asoc ? &asoc->base : &ep->base;
+       sk = rcvr->sk;
+
+       /*
+        * If a frame arrives on an interface and the receiving socket is
+        * bound to another interface, via SO_BINDTODEVICE, treat it as OOTB
+        */
+       if (sk->sk_bound_dev_if && (sk->sk_bound_dev_if != af->skb_iif(skb)))
+       {
+               sock_put(sk);
+               if (asoc) {
+                       sctp_association_put(asoc);
+                       asoc = NULL;
+               } else {
+                       sctp_endpoint_put(ep);
+                       ep = NULL;
+               }
+               sk = sctp_get_ctl_sock();
+               ep = sctp_sk(sk)->ep;
+               sctp_endpoint_hold(ep);
+               sock_hold(sk);
+               rcvr = &ep->base;
+       }
+
+       if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf)
+               goto discard_release;
+
        /*
         * RFC 2960, 8.4 - Handle "Out of the blue" Packets.
         * An SCTP packet is called an "out of the blue" (OOTB)
@@ -187,22 +218,12 @@ int sctp_rcv(struct sk_buff *skb)
         * packet belongs.
         */
        if (!asoc) {
-               ep = __sctp_rcv_lookup_endpoint(&dest);
                if (sctp_rcv_ootb(skb)) {
                        SCTP_INC_STATS_BH(SCTP_MIB_OUTOFBLUES);
                        goto discard_release;
                }
        }
 
-       /* Retrieve the common input handling substructure. */
-       rcvr = asoc ? &asoc->base : &ep->base;
-       sk = rcvr->sk;
-
-       if ((sk) && (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf)) {
-               goto discard_release;
-       }
-
-
        /* SCTP seems to always need a timestamp right now (FIXME) */
        if (skb->stamp.tv_sec == 0) {
                do_gettimeofday(&skb->stamp);
@@ -265,13 +286,11 @@ discard_it:
 
 discard_release:
        /* Release any structures we may be holding. */
-       if (asoc) {
-               sock_put(asoc->base.sk);
+       sock_put(sk);
+       if (asoc)
                sctp_association_put(asoc);
-       } else {
-               sock_put(ep->base.sk);
+       else
                sctp_endpoint_put(ep);
-       }
 
        goto discard_it;
 }