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ipv6: do not send RTM_DELADDR for tentative addresses 

RTM_NEWADDR notification is sent when IFA_F_TENTATIVE is cleared from
the address. So if the address is added and deleted before DAD probes
completes, the RTM_DELADDR will be sent for which there was no
RTM_NEWADDR causing asymmetry in notification. However if the same
logic is used while sending RTM_DELADDR notification, this asymmetry
can be avoided.

Signed-off-by: Mahesh Bandewar <maheshb@google.com>
CC: Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>
CC: Patrick McHardy <kaber@trash.net>
CC: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Mahesh Bandewar 2017-01-04 15:01:01 -08:00 committed by David S. Miller
parent 90028b07a7
commit f784ad3d79
1 changed files with 7 additions and 0 deletions
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7
net/ipv6/addrconf.c
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@ -4888,6 +4888,13 @@ static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
struct net *net = dev_net(ifa->idev->dev);
int err = -ENOBUFS;
/* Don't send DELADDR notification for TENTATIVE address,
* since NEWADDR notification is sent only after removing
* TENTATIVE flag.
*/
if (ifa->flags & IFA_F_TENTATIVE && event == RTM_DELADDR)
return;
skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
if (!skb)
goto errout;