linux-kernel - [PATCH v6 net 2/4] net/sched: sch_clsact: Only create under TC_H

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Message-Id: <2b012b76ec2315729d3e993a69b36753e8d9d29f.1685388545.git.peilin.ye@bytedance.com>
Date:   Mon, 29 May 2023 12:53:21 -0700
From:   Peilin Ye <yepeilin.cs@...il.com>
To:     Jamal Hadi Salim <jhs@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     Peilin Ye <peilin.ye@...edance.com>,
        John Fastabend <john.fastabend@...il.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Vlad Buslov <vladbu@...lanox.com>,
        Pedro Tammela <pctammela@...atatu.com>,
        Hillf Danton <hdanton@...a.com>,
        Zhengchao Shao <shaozhengchao@...wei.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Cong Wang <cong.wang@...edance.com>,
        Peilin Ye <yepeilin.cs@...il.com>
Subject: [PATCH v6 net 2/4] net/sched: sch_clsact: Only create under TC_H_CLSACT

From: Peilin Ye <peilin.ye@...edance.com>

clsact Qdiscs are only supposed to be created under TC_H_CLSACT (which
equals TC_H_INGRESS).  Return -EOPNOTSUPP if 'parent' is not
TC_H_CLSACT.

Fixes: 1f211a1b929c ("net, sched: add clsact qdisc")
Tested-by: Pedro Tammela <pctammela@...atatu.com>
Acked-by: Jamal Hadi Salim <jhs@...atatu.com>
Reviewed-by: Jamal Hadi Salim <jhs@...atatu.com>
Reviewed-by: Vlad Buslov <vladbu@...dia.com>
Signed-off-by: Peilin Ye <peilin.ye@...edance.com>
---
 net/sched/sch_ingress.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/net/sched/sch_ingress.c b/net/sched/sch_ingress.c
index f9ef6deb2770..35963929e117 100644
--- a/net/sched/sch_ingress.c
+++ b/net/sched/sch_ingress.c
@@ -225,6 +225,9 @@ static int clsact_init(struct Qdisc *sch, struct nlattr *opt,
 	struct net_device *dev = qdisc_dev(sch);
 	int err;
 
+	if (sch->parent != TC_H_CLSACT)
+		return -EOPNOTSUPP;
+
 	net_inc_ingress_queue();
 	net_inc_egress_queue();
 
@@ -254,6 +257,9 @@ static void clsact_destroy(struct Qdisc *sch)
 {
 	struct clsact_sched_data *q = qdisc_priv(sch);
 
+	if (sch->parent != TC_H_CLSACT)
+		return;
+
 	tcf_block_put_ext(q->egress_block, sch, &q->egress_block_info);
 	tcf_block_put_ext(q->ingress_block, sch, &q->ingress_block_info);
 
-- 
2.20.1