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27 March 2024, 02:37:15 UTC
Revision fc75fc8339e7727167443469027540b283daac71 authored by Eric Dumazet on 22 December 2010, 04:39:39 UTC, committed by David S. Miller on 26 December 2010, 04:05:31 UTC 
ipv4: dont create routes on down devices
 
In ip_route_output_slow(), instead of allowing a route to be created on
a not UPed device, report -ENETUNREACH immediately.

# ip tunnel add mode ipip remote 10.16.0.164 local
10.16.0.72 dev eth0
# (Note : tunl1 is down)
# ping -I tunl1 10.1.2.3
PING 10.1.2.3 (10.1.2.3) from 192.168.18.5 tunl1: 56(84) bytes of data.
(nothing)
# ./a.out tunl1
# ip tunnel del tunl1
Message from syslogd@shelby at Dec 22 10:12:08 ...
  kernel: unregister_netdevice: waiting for tunl1 to become free.
Usage count = 3

After patch:
# ping -I tunl1 10.1.2.3
connect: Network is unreachable

Reported-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Reviewed-by: Octavian Purdila <opurdila@ixiacom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
1 parent 7a36df8
History
Tip revision: fc75fc8339e7727167443469027540b283daac71 authored by Eric Dumazet on 22 December 2010, 04:39:39 UTC
ipv4: dont create routes on down devices
Tip revision: fc75fc8
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