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bpf: Return target info when a tracing bpf_link is queried

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There is currently no way to discover the target of a tracing program
attachment after the fact. Add this information to bpf_link_info and return
it when querying the bpf_link fd.

Signed-off-by: Toke Høiland-Jørgensen <toke@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20210413091607.58945-1-toke@redhat.com
This commit is contained in:
Toke Høiland-Jørgensen 2021-04-13 11:16:06 +02:00 • committed by Alexei Starovoitov
parent db16c1fe92
commit 441e8c66b2
4 changed files with 16 additions and 0 deletions
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tools/include/uapi/linux/bpf.h
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@ -5416,6 +5416,8 @@ struct bpf_link_info {
} raw_tracepoint;
struct {
__u32 attach_type;
__u32 target_obj_id; /* prog_id for PROG_EXT, otherwise btf object id */
__u32 target_btf_id; /* BTF type id inside the object */
} tracing;
struct {
__u64 cgroup_id;