ipv6: don't set DST_NOCOUNT for remotely added routes

[ Upstream commit c88507fbad8055297c1d1e21e599f46960cbee39 ]

DST_NOCOUNT should only be used if an authorized user adds routes
locally. In case of routes which are added on behalf of router
advertisments this flag must not get used as it allows an unlimited
number of routes getting added remotely.

Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 0accb1321dd61518a897ea723e00be4415d21c0d..77f81beabbd34840b66d0806419ee59e63eb6aba 100644 (file)
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -1500,7 +1500,7 @@ int ip6_route_add(struct fib6_config *cfg)
        if (!table)
                goto out;
 
-       rt = ip6_dst_alloc(net, NULL, DST_NOCOUNT, table);
+       rt = ip6_dst_alloc(net, NULL, (cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT, table);
 
        if (!rt) {
                err = -ENOMEM;