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UPSTREAM: bpf: Support GET_FD_BY_ID and GET_NEXT_ID for bpf_link

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Add support to look up bpf_link by ID and iterate over all existing bpf_links
in the system. GET_FD_BY_ID code handles not-yet-ready bpf_link by checking
that its ID hasn't been set to non-zero value yet. Setting bpf_link's ID is
done as the very last step in finalizing bpf_link, together with installing
FD. This approach allows users of bpf_link in kernel code to not worry about
races between user-space and kernel code that hasn't finished attaching and
initializing bpf_link.

Change-Id: I657f368d4f9d70fae84a66cb4846e796fbc1267b
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200429001614.1544-4-andriin@fb.com
This commit is contained in:
Andrii Nakryiko 2020-04-28 17:16:07 -07:00 • committed by basamaryan
commit c070af298c
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2 changed files with 51 additions and 0 deletions
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2
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 {