From 439677d766ba9095e5afc4a30147f65bc363b6e7 Mon Sep 17 00:00:00 2001 From: "fan.du" Date: Thu, 1 Aug 2013 17:44:44 +0800 Subject: [PATCH] ipv6: bump genid when delete/add address Server Client 2001:1::803/64 <-> 2001:1::805/64 2001:2::804/64 <-> 2001:2::806/64 Server side fib binary tree looks like this: (2001:/64) / / ffff88002103c380 / \ (2) / \ (2001::803/128) ffff880037ac07c0 / \ / \ (3) ffff880037ac0640 (2001::806/128) / \ (1) / \ (2001::804/128) (2001::805/128) Delete 2001::804/64 won't cause prefix route deleted as well as rt in (3) destinate to 2001::806 with source address as 2001::804/64. That's because 2001::803/64 is still alive, which make onlink=1 in ipv6_del_addr, this is where the substantial difference between same prefix configuration and different prefix configuration :) So packet are still transmitted out to 2001::806 with source address as 2001::804/64. So bump genid will clear rt in (3), and up layer protocol will eventually find the right one for themselves. This problem arised from the discussion in here: http://marc.info/?l=linux-netdev&m=137404469219410&w=4 Signed-off-by: Fan Du Signed-off-by: David S. Miller --- net/ipv6/addrconf.c | 1 + 1 file changed, 1 insertion(+) diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c index cfdcf7b..e7780d7 100644 --- a/net/ipv6/addrconf.c +++ b/net/ipv6/addrconf.c @@ -4653,6 +4653,7 @@ static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) break; } atomic_inc(&net->ipv6.dev_addr_genid); + rt_genid_bump_ipv6(net); } static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) -- 2.7.4