[SCTP] Support SO_BINDTODEVICE socket option on incoming packets.

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>

1 files changed, 34 insertions, 15 deletions

diff --git a/net/sctp/input.c b/net/sctp/input.c
index b719a77d66b4..fffc880a646d 100644
--- a/net/sctp/input.c
+++ b/net/sctp/input.c
@@ -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;
 }