From: Patrick Caulfield <patrick@tykepenguin.com>
Date: Tue, 3 Jan 2006 22:24:02 +0000 (-0800)
Subject: [DECNET]: Only use local routers
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=5062430c5cc526655e3d10c670fc9c263656f66c;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git

[DECNET]: Only use local routers

The attached patch makes DECnet routing only use routers from the same
area - rather than the highest rated router seen.

In theory there should not be an out-of-area router on a local network
but some networks are bridged rather than properly routed. VMS seems
to behave similarly: if I bring up a VMS node with no router then it
can't see anything else on the global network.

Signed-off-by: Patrick Caulfield <patrick@tykepenguin.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/decnet/dn_neigh.c b/net/decnet/dn_neigh.c
index 8d0cc3cf3e49..33ab256cfd4a 100644
--- a/net/decnet/dn_neigh.c
+++ b/net/decnet/dn_neigh.c
@@ -408,11 +408,14 @@ int dn_neigh_router_hello(struct sk_buff *skb)
 			}
 		}
 
-		if (!dn_db->router) {
-			dn_db->router = neigh_clone(neigh);
-		} else {
-			if (msg->priority > ((struct dn_neigh *)dn_db->router)->priority)
-				neigh_release(xchg(&dn_db->router, neigh_clone(neigh)));
+		/* Only use routers in our area */
+		if ((dn_ntohs(src)>>10) == dn_ntohs((decnet_address)>>10)) {
+			if (!dn_db->router) {
+				dn_db->router = neigh_clone(neigh);
+			} else {
+				if (msg->priority > ((struct dn_neigh *)dn_db->router)->priority)
+					neigh_release(xchg(&dn_db->router, neigh_clone(neigh)));
+			}
 		}
 		write_unlock(&neigh->lock);
 		neigh_release(neigh);