[IPV6]: ROUTE: Handle finding the next best route in reachability in BACKTRACK().

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 18 insertions, 10 deletions

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index d8f3637952a2..6a068e7f81f1 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -414,23 +414,22 @@ void ip6_route_input(struct sk_buff *skb)
         int strict;
         int attempts = 3;
         int err;
+        int reachable = RT6_SELECT_F_REACHABLE;
 
         strict = ipv6_addr_type(&skb->nh.ipv6h->daddr) & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL) ? RT6_SELECT_F_IFACE : 0;
 
 relookup:
         read_lock_bh(&rt6_lock);
 
+restart_2:
         fn = fib6_lookup(&ip6_routing_table, &skb->nh.ipv6h->daddr,
                          &skb->nh.ipv6h->saddr);
 
 restart:
-        rt = fn->leaf;
-
-        rt = rt6_select(&fn->leaf, skb->dev->ifindex, strict | RT6_SELECT_F_REACHABLE);
-        if (rt == &ip6_null_entry)
-                rt = rt6_select(&fn->leaf, skb->dev->ifindex, strict);
+        rt = rt6_select(&fn->leaf, skb->dev->ifindex, strict | reachable);
         BACKTRACK();
-        if ((rt->rt6i_flags & RTF_CACHE))
+        if (rt == &ip6_null_entry ||
+            rt->rt6i_flags & RTF_CACHE)
                 goto out;
 
         dst_hold(&rt->u.dst);
@@ -467,6 +466,10 @@ restart:
         goto relookup;
 
 out:
+        if (reachable) {
+                reachable = 0;
+                goto restart_2;
+        }
         dst_hold(&rt->u.dst);
         read_unlock_bh(&rt6_lock);
 out2:
@@ -483,20 +486,21 @@ struct dst_entry * ip6_route_output(struct sock *sk, struct flowi *fl)
         int strict;
         int attempts = 3;
         int err;
+        int reachable = RT6_SELECT_F_REACHABLE;
 
         strict = ipv6_addr_type(&fl->fl6_dst) & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL) ? RT6_SELECT_F_IFACE : 0;
 
 relookup:
         read_lock_bh(&rt6_lock);
 
+restart_2:
         fn = fib6_lookup(&ip6_routing_table, &fl->fl6_dst, &fl->fl6_src);
 
 restart:
-        rt = rt6_select(&fn->leaf, fl->oif, strict | RT6_SELECT_F_REACHABLE);
-        if (rt == &ip6_null_entry)
-                rt = rt6_select(&fn->leaf, fl->oif, strict);
+        rt = rt6_select(&fn->leaf, fl->oif, strict | reachable);
         BACKTRACK();
-        if ((rt->rt6i_flags & RTF_CACHE))
+        if (rt == &ip6_null_entry ||
+            rt->rt6i_flags & RTF_CACHE)
                 goto out;
 
         dst_hold(&rt->u.dst);
@@ -533,6 +537,10 @@ restart:
         goto relookup;
 
 out:
+        if (reachable) {
+                reachable = 0;
+                goto restart_2;
+        }
         dst_hold(&rt->u.dst);
         read_unlock_bh(&rt6_lock);
 out2: