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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 4b4944c3e4c4473c8b1ca4fbce8700a8af988604..40b6e69107921f3d10fdd0b75a1e793f11272eea 100644 (file)
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -1495,7 +1495,7 @@ 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;