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Message-Id: <182b2a2be81ad5ac0f58effe34e3a320de04d6c7.1685388545.git.peilin.ye@bytedance.com> Date: Mon, 29 May 2023 12:54:26 -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 4/4] net/sched: Prohibit regrafting ingress or clsact Qdiscs From: Peilin Ye <peilin.ye@...edance.com> Currently, after creating an ingress (or clsact) Qdisc and grafting it under TC_H_INGRESS (TC_H_CLSACT), it is possible to graft it again under e.g. a TBF Qdisc: $ ip link add ifb0 type ifb $ tc qdisc add dev ifb0 handle 1: root tbf rate 20kbit buffer 1600 limit 3000 $ tc qdisc add dev ifb0 clsact $ tc qdisc link dev ifb0 handle ffff: parent 1:1 $ tc qdisc show dev ifb0 qdisc tbf 1: root refcnt 2 rate 20Kbit burst 1600b lat 560.0ms qdisc clsact ffff: parent ffff:fff1 refcnt 2 ^^^^^^^^ clsact's refcount has increased: it is now grafted under both TC_H_CLSACT and 1:1. ingress and clsact Qdiscs should only be used under TC_H_INGRESS (TC_H_CLSACT). Prohibit regrafting them. Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") 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_api.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c index 383195955b7d..49b9c1bbfdd9 100644 --- a/net/sched/sch_api.c +++ b/net/sched/sch_api.c @@ -1596,6 +1596,11 @@ static int tc_modify_qdisc(struct sk_buff *skb, struct nlmsghdr *n, NL_SET_ERR_MSG(extack, "Invalid qdisc name"); return -EINVAL; } + if (q->flags & TCQ_F_INGRESS) { + NL_SET_ERR_MSG(extack, + "Cannot regraft ingress or clsact Qdiscs"); + return -EINVAL; + } if (q == p || (p && check_loop(q, p, 0))) { NL_SET_ERR_MSG(extack, "Qdisc parent/child loop detected"); -- 2.20.1
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