[IPV6]: ROUTE: Add experimental support for Route Information Option in RA (RFC4191).

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

1 files changed, 24 insertions, 1 deletions

diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index f4462ee33024..1f6256909674 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -156,7 +156,11 @@ struct neigh_table nd_tbl = {
 
 /* ND options */
 struct ndisc_options {
-        struct nd_opt_hdr *nd_opt_array[__ND_OPT_MAX];
+        struct nd_opt_hdr *nd_opt_array[__ND_OPT_ARRAY_MAX];
+#ifdef CONFIG_IPV6_ROUTE_INFO
+        struct nd_opt_hdr *nd_opts_ri;
+        struct nd_opt_hdr *nd_opts_ri_end;
+#endif
 };
 
 #define nd_opts_src_lladdr      nd_opt_array[ND_OPT_SOURCE_LL_ADDR]
@@ -255,6 +259,13 @@ static struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len,
                         if (ndopts->nd_opt_array[nd_opt->nd_opt_type] == 0)
                                 ndopts->nd_opt_array[nd_opt->nd_opt_type] = nd_opt;
                         break;
+#ifdef CONFIG_IPV6_ROUTE_INFO
+                case ND_OPT_ROUTE_INFO:
+                        ndopts->nd_opts_ri_end = nd_opt;
+                        if (!ndopts->nd_opts_ri)
+                                ndopts->nd_opts_ri = nd_opt;
+                        break;
+#endif
                 default:
                         /*
                          * Unknown options must be silently ignored,
@@ -1202,6 +1213,18 @@ skip_defrtr:
                              NEIGH_UPDATE_F_ISROUTER);
         }
 
+#ifdef CONFIG_IPV6_ROUTE_INFO
+        if (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)) {
+                        rt6_route_rcv(skb->dev, (u8*)p, (p->nd_opt_len) << 3,
+                                      &skb->nh.ipv6h->saddr);
+                }
+        }
+#endif
+
         if (in6_dev->cnf.accept_ra_pinfo && ndopts.nd_opts_pi) {
                 struct nd_opt_hdr *p;
                 for (p = ndopts.nd_opts_pi;