[IPV6]: ROUTE: Add accept_ra_rtr_pref sysctl.

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

1 files changed, 2 insertions, 1 deletions

diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index 966ab6b3022e..f4462ee33024 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -1090,7 +1090,8 @@ static void ndisc_router_discovery(struct sk_buff *skb)
 #ifdef CONFIG_IPV6_ROUTER_PREF
         pref = ra_msg->icmph.icmp6_router_pref;
         /* 10b is handled as if it were 00b (medium) */
-        if (pref == ICMPV6_ROUTER_PREF_INVALID)
+        if (pref == ICMPV6_ROUTER_PREF_INVALID ||
+            in6_dev->cnf.accept_ra_rtr_pref)
                 pref = ICMPV6_ROUTER_PREF_MEDIUM;
 #endif