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net/sched: fix ->get helper of the matchall cls

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[ Upstream commit 0db6f8befc32c68bb13d7ffbb2e563c79e913e13 ]

It returned always NULL, thus it was never possible to get the filter.

Example:
$ ip link add foo type dummy
$ ip link add bar type dummy
$ tc qdisc add dev foo clsact
$ tc filter add dev foo protocol all pref 1 ingress handle 1234 \
	matchall action mirred ingress mirror dev bar

Before the patch:
$ tc filter get dev foo protocol all pref 1 ingress handle 1234 matchall
Error: Specified filter handle not found.
We have an error talking to the kernel

After:
$ tc filter get dev foo protocol all pref 1 ingress handle 1234 matchall
filter ingress protocol all pref 1 matchall chain 0 handle 0x4d2
  not_in_hw
        action order 1: mirred (Ingress Mirror to device bar) pipe
        index 1 ref 1 bind 1

CC: Yotam Gigi <yotamg@mellanox.com>
CC: Jiri Pirko <jiri@mellanox.com>
Fixes: fd62d9f5c5 ("net/sched: matchall: Fix configuration race")
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Nicolas Dichtel 2019-03-28 10:35:06 +01:00 • committed by Greg Kroah-Hartman
commit eeedfa94c1
1 changed files with 5 additions and 0 deletions
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5
net/sched/cls_matchall.c
View file

@ -126,6 +126,11 @@ static void mall_destroy(struct tcf_proto *tp, struct netlink_ext_ack *extack)
static void *mall_get(struct tcf_proto *tp, u32 handle)
{
struct cls_mall_head *head = rtnl_dereference(tp->root);
if (head && head->handle == handle)
return head;
return NULL;
}