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bpf: Add support for BPF_OBJ_GET_INFO_BY_FD for bpf_link

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Add ability to fetch bpf_link details through BPF_OBJ_GET_INFO_BY_FD command.
Also enhance show_fdinfo to potentially include bpf_link type-specific
information (similarly to obj_info).

Also introduce enum bpf_link_type stored in bpf_link itself and expose it in
UAPI. bpf_link_tracing also now will store and return bpf_attach_type.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200429001614.1544-5-andriin@fb.com
This commit is contained in:
Andrii Nakryiko 2020-04-28 17:16:08 -07:00 committed by Andrii Nakryiko
parent 7878754030
commit 2a374b5df0
1 changed files with 31 additions and 0 deletions
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31
include/uapi/linux/bpf.h
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@ -113,6 +113,8 @@ enum bpf_cmd {
BPF_MAP_DELETE_BATCH,
BPF_LINK_CREATE,
BPF_LINK_UPDATE,
BPF_LINK_GET_FD_BY_ID,
BPF_LINK_GET_NEXT_ID,
};
enum bpf_map_type {
@ -220,6 +222,15 @@ enum bpf_attach_type {
#define MAX_BPF_ATTACH_TYPE __MAX_BPF_ATTACH_TYPE
enum bpf_link_type {
BPF_LINK_TYPE_UNSPEC = 0,
BPF_LINK_TYPE_RAW_TRACEPOINT = 1,
BPF_LINK_TYPE_TRACING = 2,
BPF_LINK_TYPE_CGROUP = 3,
MAX_BPF_LINK_TYPE,
};
/* cgroup-bpf attach flags used in BPF_PROG_ATTACH command
*
* NONE(default): No further bpf programs allowed in the subtree.
@ -523,6 +534,7 @@ union bpf_attr {
__u32 prog_id;
__u32 map_id;
__u32 btf_id;
__u32 link_id;
};
__u32 next_id;
__u32 open_flags;
@ -3609,6 +3621,25 @@ struct bpf_btf_info {
__u32 id;
} __attribute__((aligned(8)));
struct bpf_link_info {
__u32 type;
__u32 id;
__u32 prog_id;
union {
struct {
__aligned_u64 tp_name; /* in/out: tp_name buffer ptr */
__u32 tp_name_len; /* in/out: tp_name buffer len */
} raw_tracepoint;
struct {
__u32 attach_type;
} tracing;
struct {
__u64 cgroup_id;
__u32 attach_type;
} cgroup;
};
} __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).