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| author |   Andrii Nakryiko <andriin@fb.com> | 2020-04-28 17:16:07 -0700 |
|---|---|---|
| committer |   Alexei Starovoitov <ast@kernel.org> | 2020-04-28 17:27:08 -0700 |
| commit | 2d602c8cf40d65d4a7ac34fe18648d8778e6e594 (patch) | |
| tree | 6c34aec45b8df74c35b19e7b7516c788f4dd29fa /include | |
| parent | bpf: Allocate ID for bpf_link (diff) | |
| download | wireguard-linux-2d602c8cf40d65d4a7ac34fe18648d8778e6e594.tar.xz wireguard-linux-2d602c8cf40d65d4a7ac34fe18648d8778e6e594.zip | |
bpf: Support GET_FD_BY_ID and GET_NEXT_ID for bpf_link
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.
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
Diffstat (limited to 'include')
| -rw-r--r-- | include/uapi/linux/bpf.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h index 6121aa487465..7e6541fceade 100644 --- a/include/uapi/linux/bpf.h +++ b/include/uapi/linux/bpf.h @@ -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 { |