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libbpf: Add support for bpf_link-based cgroup attachment

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Add bpf_program__attach_cgroup(), which uses BPF_LINK_CREATE subcommand to
create an FD-based kernel bpf_link. Also add low-level bpf_link_create() API.

If expected_attach_type is not specified explicitly with
bpf_program__set_expected_attach_type(), libbpf will try to determine proper
attach type from BPF program's section definition.

Also add support for bpf_link's underlying BPF program replacement:
  - unconditional through high-level bpf_link__update_program() API;
  - cmpxchg-like with specifying expected current BPF program through
    low-level bpf_link_update() API.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200330030001.2312810-4-andriin@fb.com
This commit is contained in:
Andrii Nakryiko
2020-03-29 20:00:00 -07:00
committed by Alexei Starovoitov
parent 0c991ebc8c
commit cc4f864bb1
6 changed files with 122 additions and 1 deletions
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12
tools/include/uapi/linux/bpf.h
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@@ -112,6 +112,7 @@ enum bpf_cmd {
BPF_MAP_UPDATE_BATCH,
BPF_MAP_DELETE_BATCH,
BPF_LINK_CREATE,
BPF_LINK_UPDATE,
};
enum bpf_map_type {
@@ -577,6 +578,17 @@ union bpf_attr {
__u32 attach_type; /* attach type */
__u32 flags; /* extra flags */
} link_create;
struct { /* struct used by BPF_LINK_UPDATE command */
__u32 link_fd; /* link fd */
/* new program fd to update link with */
__u32 new_prog_fd;
__u32 flags; /* extra flags */
/* expected link's program fd; is specified only if
* BPF_F_REPLACE flag is set in flags */
__u32 old_prog_fd;
} link_update;
} __attribute__((aligned(8)));
/* The description below is an attempt at providing documentation to eBPF