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authorDuan Jiong <duanj.fnst@cn.fujitsu.com>2014-05-15 11:56:14 +0400
committerDavid S. Miller <davem@davemloft.net>2014-05-16 07:26:27 +0400
commitbe7a010d6fa33dca9327ad8e91844278dfd1e712 (patch)
tree887779b523c3a19a0e7965b5bd6f29fd51ad809e /net/ipv6/ndisc.c
parentf895f0cfbb77ff432bb6ae4df27b608adbe6573f (diff)
downloadlinux-be7a010d6fa33dca9327ad8e91844278dfd1e712.tar.xz
ipv6: update Destination Cache entries when gateway turn into host
RFC 4861 states in 7.2.5: The IsRouter flag in the cache entry MUST be set based on the Router flag in the received advertisement. In those cases where the IsRouter flag changes from TRUE to FALSE as a result of this update, the node MUST remove that router from the Default Router List and update the Destination Cache entries for all destinations using that neighbor as a router as specified in Section 7.3.3. This is needed to detect when a node that is used as a router stops forwarding packets due to being configured as a host. Currently, when dealing with NA Message which IsRouter flag changes from TRUE to FALSE, the kernel only removes router from the Default Router List, and don't update the Destination Cache entries. Now in order to update those Destination Cache entries, i introduce function rt6_clean_tohost(). Signed-off-by: Duan Jiong <duanj.fnst@cn.fujitsu.com> Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/ndisc.c')
-rw-r--r--net/ipv6/ndisc.c7
1 files changed, 2 insertions, 5 deletions
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index 09a22f4f36c9..ca8d4ea48a5d 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -851,7 +851,7 @@ out:
static void ndisc_recv_na(struct sk_buff *skb)
{
struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb);
- const struct in6_addr *saddr = &ipv6_hdr(skb)->saddr;
+ struct in6_addr *saddr = &ipv6_hdr(skb)->saddr;
const struct in6_addr *daddr = &ipv6_hdr(skb)->daddr;
u8 *lladdr = NULL;
u32 ndoptlen = skb_tail_pointer(skb) - (skb_transport_header(skb) +
@@ -944,10 +944,7 @@ static void ndisc_recv_na(struct sk_buff *skb)
/*
* Change: router to host
*/
- struct rt6_info *rt;
- rt = rt6_get_dflt_router(saddr, dev);
- if (rt)
- ip6_del_rt(rt);
+ rt6_clean_tohost(dev_net(dev), saddr);
}
out: