linux-kernel - [RFC PATCH bpf-next v3 07/12] libbpf: Support passing user-defined flags for struct

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Message-ID: <006635a13eeae0fe8da56447bc5131f6a80a48bf.1769157382.git.zhuhui@kylinos.cn>
Date: Fri, 23 Jan 2026 16:58:01 +0800
From: Hui Zhu <hui.zhu@...ux.dev>
To: Andrew Morton <akpm@...ux-foundation.org>,
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Cc: Hui Zhu <zhuhui@...inos.cn>,
	Geliang Tang <geliang@...nel.org>
Subject: [RFC PATCH bpf-next v3 07/12] libbpf: Support passing user-defined flags for struct_ops

From: Hui Zhu <zhuhui@...inos.cn>

Building on the previous change that added flags to the kernel's link
creation path, this patch exposes this functionality through libbpf.

The `bpf_struct_ops_opts` struct is extended with a `flags` member,
which is then passed to the `bpf_link_create` syscall within
`bpf_map__attach_struct_ops_opts`.

This enables userspace applications to pass flags, such as
`BPF_F_ALLOW_OVERRIDE`, when attaching struct_ops to cgroups,
providing more control over the attachment behavior in nested
hierarchies.

Signed-off-by: Geliang Tang <geliang@...nel.org>
Signed-off-by: Hui Zhu <zhuhui@...inos.cn>
---
 tools/lib/bpf/libbpf.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index 37eb4f96b28e..089bd1325468 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -13508,6 +13508,7 @@ struct bpf_link *bpf_map__attach_struct_ops_opts(const struct bpf_map *map,
 	}
 
 	link_opts.cgroup.relative_fd = OPTS_GET(opts, relative_fd, 0);
+	link_opts.flags = OPTS_GET(opts, flags, 0);
 
 	fd = bpf_link_create(map->fd, 0, BPF_STRUCT_OPS, &link_opts);
 	if (fd < 0) {
-- 
2.43.0