net: neigh: Fix netevent NETEVENT_DELAY_PROBE_TIME_UPDATE notification
authorMarcus Huewe <suse-tux@gmx.de>
Wed, 15 Feb 2017 00:00:36 +0000 (01:00 +0100)
committerDavid S. Miller <davem@davemloft.net>
Wed, 15 Feb 2017 17:38:43 +0000 (12:38 -0500)
commit7627ae6030f56a9a91a5b3867b21f35d79c16e64
treecf07d58102c52ec80609175dfc2c123dd80ac96a
parentacf138f1b00bdd1b7cd9894562ed0c2a1670888e
net: neigh: Fix netevent NETEVENT_DELAY_PROBE_TIME_UPDATE notification

When setting a neigh related sysctl parameter, we always send a
NETEVENT_DELAY_PROBE_TIME_UPDATE netevent. For instance, when
executing

sysctl net.ipv6.neigh.wlp3s0.retrans_time_ms=2000

a NETEVENT_DELAY_PROBE_TIME_UPDATE netevent is generated.

This is caused by commit 2a4501ae18b5 ("neigh: Send a
notification when DELAY_PROBE_TIME changes"). According to the
commit's description, it was intended to generate such an event
when setting the "delay_first_probe_time" sysctl parameter.

In order to fix this, only generate this event when actually
setting the "delay_first_probe_time" sysctl parameter. This fix
should not have any unintended side-effects, because all but one
registered netevent callbacks check for other netevent event
types (the registered callbacks were obtained by grepping for
"register_netevent_notifier"). The only callback that uses the
NETEVENT_DELAY_PROBE_TIME_UPDATE event is
mlxsw_sp_router_netevent_event() (in
drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c): in case
of this event, it only accesses the DELAY_PROBE_TIME of the
passed neigh_parms.

Fixes: 2a4501ae18b5 ("neigh: Send a notification when DELAY_PROBE_TIME changes")
Signed-off-by: Marcus Huewe <suse-tux@gmx.de>
Reviewed-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/core/neighbour.c