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author | 2020-04-28 17:16:07 -0700 | |
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committer | 2020-04-28 17:27:08 -0700 | |
commit | 2d602c8cf40d65d4a7ac34fe18648d8778e6e594 (patch) | |
tree | 6c34aec45b8df74c35b19e7b7516c788f4dd29fa /include/linux/bpf-cgroup.h | |
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/linux/bpf-cgroup.h')
0 files changed, 0 insertions, 0 deletions