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bpf: btf: Add struct bpf_btf_info

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During BPF_OBJ_GET_INFO_BY_FD on a btf_fd, the current bpf_attr's
info.info is directly filled with the BTF binary data.  It is
not extensible.  In this case, we want to add BTF ID.

This patch adds "struct bpf_btf_info" which has the BTF ID as
one of its member.  The BTF binary data itself is exposed through
the "btf" and "btf_size" members.

Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Acked-by: Alexei Starovoitov <ast@fb.com>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Martin KaFai Lau
2018-05-04 14:49:52 -07:00
committed by Daniel Borkmann
parent 78958fca7e
commit 62dab84c81
3 changed files with 43 additions and 6 deletions
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6
include/uapi/linux/bpf.h
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@@ -2137,6 +2137,12 @@ struct bpf_map_info {
__u32 btf_value_id;
} __attribute__((aligned(8)));
struct bpf_btf_info {
__aligned_u64 btf;
__u32 btf_size;
__u32 id;
} __attribute__((aligned(8)));
/* User bpf_sock_addr struct to access socket fields and sockaddr struct passed
* by user and intended to be used by socket (e.g. to bind to, depends on
* attach attach type).