[IPV6] NDISC: Ignore route information with /0 prefix from interior router.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>

1 files changed, 7 insertions, 1 deletions

diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index 53b546019fd5..16273e11e53d 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -1272,7 +1272,13 @@ skip_linkparms:
                 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)
+                        struct route_info *ri = (struct route_info *)p;
+#ifdef CONFIG_IPV6_NDISC_NODETYPE
+                        if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT &&
+                            ri->prefix_len == 0)
+                                continue;
+#endif
+                        if (ri->prefix_len > in6_dev->cnf.accept_ra_rt_info_max_plen)
                                 continue;
                         rt6_route_rcv(skb->dev, (u8*)p, (p->nd_opt_len) << 3,
                                       &ipv6_hdr(skb)->saddr);