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libbpf: Add support for associating BPF program with struct_ops

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Add low-level wrapper and libbpf API for BPF_PROG_ASSOC_STRUCT_OPS
command in the bpf() syscall.

Signed-off-by: Amery Hung <ameryhung@gmail.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20251203233748.668365-4-ameryhung@gmail.com
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Amery Hung authored and Andrii Nakryiko committed 2025-12-16 09:52:07 -08:00
1 parent 1a41b12b4f
commit 5635185147
5 files changed
+89
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src/bpf.c
+19
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@@ -1397,3 +1397,22 @@ int bpf_prog_stream_read(int prog_fd, __u32 stream_id, void *buf, __u32 buf_len,
err = sys_bpf(BPF_PROG_STREAM_READ_BY_FD, &attr, attr_sz);
return libbpf_err_errno(err);
}
int bpf_prog_assoc_struct_ops(int prog_fd, int map_fd,
struct bpf_prog_assoc_struct_ops_opts *opts)
{
const size_t attr_sz = offsetofend(union bpf_attr, prog_assoc_struct_ops);
union bpf_attr attr;
int err;
if (!OPTS_VALID(opts, bpf_prog_assoc_struct_ops_opts))
return libbpf_err(-EINVAL);
memset(&attr, 0, attr_sz);
attr.prog_assoc_struct_ops.map_fd = map_fd;
attr.prog_assoc_struct_ops.prog_fd = prog_fd;
attr.prog_assoc_struct_ops.flags = OPTS_GET(opts, flags, 0);
err = sys_bpf(BPF_PROG_ASSOC_STRUCT_OPS, &attr, attr_sz);
return libbpf_err_errno(err);
}