ipv4 routing: Ensure that route cache entries are usable and reclaimable with caching...

[uclinux-h8/linux.git] / net / ipv4 / route.c

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 65b3a8b..278f46f 100644 (file)
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1093,8 +1093,27 @@ restart:
                 * If we drop it here, the callers have no way to resolve routes
                 * when we're not caching.  Instead, just point *rp at rt, so
                 * the caller gets a single use out of the route
+                * Note that we do rt_free on this new route entry, so that
+                * once its refcount hits zero, we are still able to reap it
+                * (Thanks Alexey)
+                * Note also the rt_free uses call_rcu.  We don't actually
+                * need rcu protection here, this is just our path to get
+                * on the route gc list.
                 */
-               goto report_and_exit;
+
+               if (rt->rt_type == RTN_UNICAST || rt->fl.iif == 0) {
+                       int err = arp_bind_neighbour(&rt->u.dst);
+                       if (err) {
+                               if (net_ratelimit())
+                                       printk(KERN_WARNING
+                                           "Neighbour table failure & not caching routes.\n");
+                               rt_drop(rt);
+                               return err;
+                       }
+               }
+
+               rt_free(rt);
+               goto skip_hashing;
        }
 
        rthp = &rt_hash_table[hash].chain;
@@ -1211,7 +1230,8 @@ restart:
 #if RT_CACHE_DEBUG >= 2
        if (rt->u.dst.rt_next) {
                struct rtable *trt;
-               printk(KERN_DEBUG "rt_cache @%02x: %pI4", hash, &rt->rt_dst);
+               printk(KERN_DEBUG "rt_cache @%02x: %pI4",
+                      hash, &rt->rt_dst);
                for (trt = rt->u.dst.rt_next; trt; trt = trt->u.dst.rt_next)
                        printk(" . %pI4", &trt->rt_dst);
                printk("\n");
@@ -1226,7 +1246,7 @@ restart:
 
        spin_unlock_bh(rt_hash_lock_addr(hash));
 
-report_and_exit:
+skip_hashing:
        if (rp)
                *rp = rt;
        else