netdev - SV: Netlink, route monitoring, RTM_DELROUTE not issued for ppp peer address. Bug or feature?

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Date:	Fri, 13 Apr 2012 15:59:34 +0200
From:	"Stian Skjelstad" <stian@...ia.no>
To:	"'Denys Fedoryshchenko'" <denys@...p.net.lb>,
	<netdev@...r.kernel.org>
Subject: SV: Netlink, route monitoring, RTM_DELROUTE not issued for ppp peer address. Bug or feature?

I've seen the same issue, and got no response so far to that very same question. Have you tested this on older kernels? I have worked around this issue by testing my local copy of routing entries that use 'via'. If they are not routable when after the RTM_DELROUTE event, I autoremove them from my local copy.

Stian Skjelstad

-----Opprinnelig melding-----
Fra: netdev-owner@...r.kernel.org [mailto:netdev-owner@...r.kernel.org] På vegne av Denys Fedoryshchenko
Sendt: 13. april 2012 14:11
Til: netdev@...r.kernel.org
Emne: Netlink, route monitoring, RTM_DELROUTE not issued for ppp peer address. Bug or feature?

Hi

I am trying to implement my own routing daemon, and using RTMGRP_IPV4_ROUTE to monitor routes.
I notice, that on PPPoE, when interface disappearing, RTM_DELROUTE will be sent to listener only for local address, but nothing about peer address attached to this interface.

CBSS_PPPoE ~ # ifconfig ppp0
ppp0      Link encap:Point-to-Point Protocol
           inet addr:172.16.146.1  P-t-P:172.16.146.10
Mask:255.255.255.255
           UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1200  Metric:1
           RX packets:40439 errors:0 dropped:0 overruns:0 frame:0
           TX packets:63211 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:3
           RX bytes:3584507 (3.4 MiB)  TX bytes:47180929 (44.9 MiB)

CBSS_PPPoE ~ # pppkill tek234@...p.net.lb  (this is killing pppd process for ppp0 interface)

ip monitor route will show only RTM_DELROUTE for RTN_LOCAL, but nothing about RTN_UNICAST for 172.16.146.10.
"Deleted local 172.16.146.1 dev ppp0  table local  proto kernel  scope host  src 172.16.146.1"
My program also receive same.

Is it a bug, that no RTM_DELROUTE issued for peer ip address? Or should i monitor also RTMGRP_IPV4_IFADDR for link disappearance?

Thanks for help!
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