From 865b804244f228e80fb62abe464296399253cce8 Mon Sep 17 00:00:00 2001
From: David Ward <david.ward@ll.mit.edu>
Date: Sun, 26 Jul 2015 12:18:58 -0400
Subject: [PATCH] net/ipv4: suppress NETDEV_UP notification on address lifetime
 update

This notification causes the FIB to be updated, which is not needed
because the address already exists, and more importantly it may undo
intentional changes that were made to the FIB after the address was
originally added. (As a point of comparison, when an address becomes
deprecated because its preferred lifetime expired, a notification on
this chain is not generated.)

The motivation for this commit is fixing an incompatibility between
DHCP clients which set and update the address lifetime according to
the lease, and a commercial VPN client which replaces kernel routes
in a way that outbound traffic is sent only through the tunnel (and
disconnects if any further route changes are detected via netlink).

Signed-off-by: David Ward <david.ward@ll.mit.edu>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 net/ipv4/devinet.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
index e813196c91c7..2d9cb1748f81 100644
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -882,7 +882,6 @@ static int inet_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
 		queue_delayed_work(system_power_efficient_wq,
 				&check_lifetime_work, 0);
 		rtmsg_ifa(RTM_NEWADDR, ifa, nlh, NETLINK_CB(skb).portid);
-		blocking_notifier_call_chain(&inetaddr_chain, NETDEV_UP, ifa);
 	}
 	return 0;
 }
-- 
GitLab