aboutsummaryrefslogtreecommitdiff
path: root/net/ipv6/ndisc.c
diff options
context:
space:
mode:
Diffstat (limited to 'net/ipv6/ndisc.c')
-rw-r--r--net/ipv6/ndisc.c49
1 files changed, 45 insertions, 4 deletions
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index cb8856b1d95..dfa20d3be9b 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,
@@ -1019,10 +1030,11 @@ static void ndisc_router_discovery(struct sk_buff *skb)
struct ra_msg *ra_msg = (struct ra_msg *) skb->h.raw;
struct neighbour *neigh = NULL;
struct inet6_dev *in6_dev;
- struct rt6_info *rt;
+ struct rt6_info *rt = NULL;
int lifetime;
struct ndisc_options ndopts;
int optlen;
+ unsigned int pref = 0;
__u8 * opt = (__u8 *)(ra_msg + 1);
@@ -1081,8 +1093,19 @@ static void ndisc_router_discovery(struct sk_buff *skb)
(ra_msg->icmph.icmp6_addrconf_other ?
IF_RA_OTHERCONF : 0);
+ if (!in6_dev->cnf.accept_ra_defrtr)
+ goto skip_defrtr;
+
lifetime = ntohs(ra_msg->icmph.icmp6_rt_lifetime);
+#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 ||
+ in6_dev->cnf.accept_ra_rtr_pref)
+ pref = ICMPV6_ROUTER_PREF_MEDIUM;
+#endif
+
rt = rt6_get_dflt_router(&skb->nh.ipv6h->saddr, skb->dev);
if (rt)
@@ -1098,7 +1121,7 @@ static void ndisc_router_discovery(struct sk_buff *skb)
ND_PRINTK3(KERN_DEBUG
"ICMPv6 RA: adding default router.\n");
- rt = rt6_add_dflt_router(&skb->nh.ipv6h->saddr, skb->dev);
+ rt = rt6_add_dflt_router(&skb->nh.ipv6h->saddr, skb->dev, pref);
if (rt == NULL) {
ND_PRINTK0(KERN_ERR
"ICMPv6 RA: %s() failed to add default route.\n",
@@ -1117,6 +1140,8 @@ static void ndisc_router_discovery(struct sk_buff *skb)
return;
}
neigh->flags |= NTF_ROUTER;
+ } else if (rt) {
+ rt->rt6i_flags |= (rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
}
if (rt)
@@ -1128,6 +1153,8 @@ static void ndisc_router_discovery(struct sk_buff *skb)
rt->u.dst.metrics[RTAX_HOPLIMIT-1] = ra_msg->icmph.icmp6_hop_limit;
}
+skip_defrtr:
+
/*
* Update Reachable Time and Retrans Timer
*/
@@ -1186,7 +1213,21 @@ static void ndisc_router_discovery(struct sk_buff *skb)
NEIGH_UPDATE_F_ISROUTER);
}
- if (ndopts.nd_opts_pi) {
+#ifdef CONFIG_IPV6_ROUTE_INFO
+ 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);
+ }
+ }
+#endif
+
+ if (in6_dev->cnf.accept_ra_pinfo && ndopts.nd_opts_pi) {
struct nd_opt_hdr *p;
for (p = ndopts.nd_opts_pi;
p;