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bpf: introduce cgroup storage maps
This commit introduces BPF_MAP_TYPE_CGROUP_STORAGE maps: a special type of maps which are implementing the cgroup storage. >From the userspace point of view it's almost a generic hash map with the (cgroup inode id, attachment type) pair used as a key. The only difference is that some operations are restricted: 1) a user can't create new entries, 2) a user can't remove existing entries. The lookup from userspace is o(log(n)). Signed-off-by: Roman Gushchin <guro@fb.com> Cc: Alexei Starovoitov <ast@kernel.org> Cc: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Martin KaFai Lau <kafai@fb.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
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8 changed files with 440 additions and 0 deletions
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@ -75,6 +75,11 @@ struct bpf_lpm_trie_key {
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__u8 data[0]; /* Arbitrary size */
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};
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struct bpf_cgroup_storage_key {
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__u64 cgroup_inode_id; /* cgroup inode id */
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__u32 attach_type; /* program attach type */
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};
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/* BPF syscall commands, see bpf(2) man-page for details. */
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enum bpf_cmd {
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BPF_MAP_CREATE,
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@ -120,6 +125,7 @@ enum bpf_map_type {
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BPF_MAP_TYPE_CPUMAP,
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BPF_MAP_TYPE_XSKMAP,
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BPF_MAP_TYPE_SOCKHASH,
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BPF_MAP_TYPE_CGROUP_STORAGE,
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};
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enum bpf_prog_type {
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