[IPV6] NDISC: Fix thinko to control Router Preference support.

Bug reported by Haruhito Watanabe <haruhito@sfc.keio.ac.jp>.

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

1 files changed, 1 insertions, 1 deletions

diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index d8b36451bada..0358e6066a4e 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -1062,7 +1062,7 @@ static void ndisc_router_discovery(struct sk_buff *skb)
         pref = ra_msg->icmph.icmp6_router_pref;
         /* 10b is handled as if it were 00b (medium) */
         if (pref == ICMPV6_ROUTER_PREF_INVALID ||
-            in6_dev->cnf.accept_ra_rtr_pref)
+            !in6_dev->cnf.accept_ra_rtr_pref)
                 pref = ICMPV6_ROUTER_PREF_MEDIUM;
 #endif