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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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4
tools/lib/bpf/libbpf.map
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@@ -243,7 +243,11 @@ LIBBPF_0.0.8 {
bpf_link__pin;
bpf_link__pin_path;
bpf_link__unpin;
bpf_link__update_program;
bpf_link_create;
bpf_link_update;
bpf_map__set_initial_value;
bpf_program__attach_cgroup;
bpf_program__attach_lsm;
bpf_program__is_lsm;
bpf_program__set_attach_target;