netdev - [PATCH bpf-next v3 14/18] bpf: net_sched: Allow writing to more Qdisc members

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Message-ID: <20250131192912.133796-15-ameryhung@gmail.com>
Date: Fri, 31 Jan 2025 11:28:53 -0800
From: Amery Hung <ameryhung@...il.com>
To: netdev@...r.kernel.org
Cc: bpf@...r.kernel.org,
	daniel@...earbox.net,
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Subject: [PATCH bpf-next v3 14/18] bpf: net_sched: Allow writing to more Qdisc members

From: Amery Hung <amery.hung@...edance.com>

Allow bpf qdisc to write to Qdisc->limit and Qdisc->q.qlen.

Signed-off-by: Amery Hung <amery.hung@...edance.com>
---
 net/sched/bpf_qdisc.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/net/sched/bpf_qdisc.c b/net/sched/bpf_qdisc.c
index 2427343d8a10..b8f02ff8734e 100644
--- a/net/sched/bpf_qdisc.c
+++ b/net/sched/bpf_qdisc.c
@@ -68,6 +68,12 @@ static int bpf_qdisc_qdisc_access(struct bpf_verifier_log *log,
 	size_t end;
 
 	switch (off) {
+	case offsetof(struct Qdisc, limit):
+		end = offsetofend(struct Qdisc, limit);
+		break;
+	case offsetof(struct Qdisc, q) + offsetof(struct qdisc_skb_head, qlen):
+		end = offsetof(struct Qdisc, q) + offsetofend(struct qdisc_skb_head, qlen);
+		break;
 	case offsetof(struct Qdisc, qstats) ... offsetofend(struct Qdisc, qstats) - 1:
 		end = offsetofend(struct Qdisc, qstats);
 		break;
-- 
2.47.1