[IPV6]: ROUTE: Add accept_ra_rt_info_max_plen sysctl.

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

1 files changed, 3 insertions, 1 deletions

diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index 1f6256909674..dfa20d3be9b6 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -1214,11 +1214,13 @@ skip_defrtr:
         }
 
 #ifdef CONFIG_IPV6_ROUTE_INFO
-        if (ndopts.nd_opts_ri) {
+        if (in6_dev->cnf.accept_ra_rtr_pref && ndopts.nd_opts_ri) {
                 struct nd_opt_hdr *p;
                 for (p = ndopts.nd_opts_ri;
                      p;
                      p = ndisc_next_option(p, ndopts.nd_opts_ri_end)) {
+                        if (((struct route_info *)p)->prefix_len > in6_dev->cnf.accept_ra_rt_info_max_plen)
+                                continue;
                         rt6_route_rcv(skb->dev, (u8*)p, (p->nd_opt_len) << 3,
                                       &skb->nh.ipv6h->saddr);
                 }