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Date:	Fri, 21 Aug 2015 10:38:37 +0530
From:	Akshat Kakkar <akshat.1984@...il.com>
To:	netdev@...r.kernel.org
Subject: Bug in tc of iproute2 ? Deleting single filter, deletes all the
 filters (apart from hashtable 800::) ...

When I am trying to  delete a single tc filter, it deleting all the
filters with the same priority/preference. i.e. it is ignoring the
handle specified.

But, When I am deleting in hashtable 800: it is deleting only the
specified filter.

For example, following set of commands  create a hashtable 15: and add
2 filters to it.

tc filter add dev eth0 parent 1:0 prio 5 handle 15: protocol ip u32 divisor 256
tc filter add dev eth0 protocol ip parent 1: prio 5 handle 15:2:2 u32
ht 15:2: match ip src 10.0.0.2 flowid 1:10
tc filter add dev eth0 protocol ip parent 1: prio 5 handle 15:2:3 u32
ht 15:2: match ip src 10.0.0.3 flowid 1:10

Now following command DELETES ALL THE FILTERS, though it should only
delete FILTER 15:2:3 !
tc filter del dev eth0 protocol ip parent 1: prio 5 handle 15:2:3 u32

O/p of tc filter show eth0 is this case is blank. As all filters are deleted.


However, similar commands when executed for hashtable 800: is deleting
only the specified filter
tc filter add dev eth0 protocol ip parent 1: prio 5 handle 800:0:2 u32
ht 800:0: match ip src 10.0.0.2 flowid 1:10
tc filter add dev eth0 protocol ip parent 1: prio 5 handle 800:0:3 u32
ht 800:0: match ip src 10.0.0.3 flowid 1:10

tc filter del dev eth0 protocol ip parent 1: prio 5 handle 800:0:2 u32

Above mentioned command only deletes single filter.
O/p of tc filter show eth0 is 2nd case is

filter parent 1: protocol ip pref 5 u32
filter parent 1: protocol ip pref 5 u32 fh 800: ht divisor 1
filter parent 1: protocol ip pref 5 u32 fh 800::3 order 3 key ht 800
bkt 0 flowid 1:10
  match 0a000003/ffffffff at 12
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