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UPSTREAM: bpf: Allocate ID for bpf_link

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Generate ID for each bpf_link using IDR, similarly to bpf_map and bpf_prog.
bpf_link creation, initialization, attachment, and exposing to user-space
through FD and ID is a complicated multi-step process, abstract it away
through bpf_link_primer and bpf_link_prime(), bpf_link_settle(), and
bpf_link_cleanup() internal API. They guarantee that until bpf_link is
properly attached, user-space won't be able to access partially-initialized
bpf_link either from FD or ID. All this allows to simplify bpf_link attachment
and error handling code.

Change-Id: I1ab538468a1bf0991088bc8dd54ed6ebd7f8adb6
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200429001614.1544-3-andriin@fb.com
This commit is contained in:
Andrii Nakryiko 2020-04-28 17:16:06 -07:00 • committed by basamaryan
commit 2f5933035f
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4 changed files with 118 additions and 57 deletions
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1
include/uapi/linux/bpf.h
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@ -523,6 +523,7 @@ union bpf_attr {
__u32 prog_id;
__u32 map_id;
__u32 btf_id;
__u32 link_id;
};
__u32 next_id;
__u32 open_flags;