net/sched: sch_clsact: Only create under TC_H_CLSACT

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@mojatatu.com>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Reviewed-by: Jamal Hadi Salim <jhs@mojatatu.com>
Reviewed-by: Vlad Buslov <vladbu@nvidia.com>
Signed-off-by: Peilin Ye <peilin.ye@bytedance.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/net/sched/sch_ingress.c b/net/sched/sch_ingress.c
index f9ef6de..3596392 100644 (file)
--- 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);