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net/sched: cls_api: increase max_reclassify_loop

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[ Upstream commit 05ff8435e50569a0a6b95e5ceaea43696e8827ab ]

modern userspace applications, like OVN, can configure the TC datapath to
"recirculate" packets several times. If more than 4 "recirculation" rules
are configured, packets can be dropped by __tcf_classify().
Changing the maximum number of reclassifications (from 4 to 16) should be
sufficient to prevent drops in most use cases, and guard against loops at
the same time.

Signed-off-by: Davide Caratti <dcaratti@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Davide Caratti 2021-05-19 15:17:21 +02:00 committed by Greg Kroah-Hartman
parent 6ceb0182b0
commit 1b832bd777
1 changed files with 1 additions and 1 deletions
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net/sched/cls_api.c
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@ -1532,7 +1532,7 @@ static inline int __tcf_classify(struct sk_buff *skb,
u32 *last_executed_chain)
{
#ifdef CONFIG_NET_CLS_ACT
const int max_reclassify_loop = 4;
const int max_reclassify_loop = 16;
const struct tcf_proto *first_tp;
int limit = 0;