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authorYOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>2006-03-20 17:04:53 -0800
committerDavid S. Miller <davem@davemloft.net>2006-03-20 17:04:53 -0800
commitebacaaa0fdf4402cdf4c8e569f54af36b6f0aa2d (patch)
tree5d1cc0c6d94b5226507434bb86e6e2a69fdd4204 /net/ipv6/ndisc.c
parent8238dd0698b480e432acd955c45f9f907b8d27de (diff)
[IPV6]: ROUTE: Add support for Router Preference (RFC4191).
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/ndisc.c')
-rw-r--r--net/ipv6/ndisc.c12
1 files changed, 11 insertions, 1 deletions
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index 3b56be85234..966ab6b3022 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -1023,6 +1023,7 @@ static void ndisc_router_discovery(struct sk_buff *skb)
int lifetime;
struct ndisc_options ndopts;
int optlen;
+ unsigned int pref = 0;
__u8 * opt = (__u8 *)(ra_msg + 1);
@@ -1086,6 +1087,13 @@ static void ndisc_router_discovery(struct sk_buff *skb)
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)
+ pref = ICMPV6_ROUTER_PREF_MEDIUM;
+#endif
+
rt = rt6_get_dflt_router(&skb->nh.ipv6h->saddr, skb->dev);
if (rt)
@@ -1101,7 +1109,7 @@ 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",
@@ -1120,6 +1128,8 @@ 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)