[PATCH] Make SO_BINDTODEVICE bind very tightly

[Casey Carter <Casey@xxxxxxxxxx>]

In the presence of both sockets that are and sockets that are not bound 
to a specific interface, those bound to the interface should always be 
favored for packet delivery over those not so bound.  Attached patch 
(against 2.6.0-test6) enforces these semantics by a slight adjustment to 
udp_v4_lookup_longway in net/ipv4/udp.c  The consequence of this change 
is to make SO_BINDTODEVICE bind more tightly than simple bind().

--
Casey Carter
Casey@xxxxxxxxxx
ccarter@xxxxxxxxxxx
AIM: cartec69

--- linux-2.6.0-test6/net/ipv4/udp.c    2003-09-27 19:50:10.000000000 -0500
+++ linux-2.6.0-test6-patch/net/ipv4/udp.c      2003-10-07 17:08:10.000000000 
-0500
@@ -246,9 +246,9 @@
                        if (sk->sk_bound_dev_if) {
                                if (sk->sk_bound_dev_if != dif)
                                        continue;
-                               score+=2;
+                               score+=8;
                        }
-                       if(score == 9) {
+                       if(score == 15) {
                                result = sk;
                                break;
                        } else if(score > badness) {