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| author | Martin KaFai Lau <kafai@fb.com> | 2017-06-05 22:15:50 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-06-06 22:41:23 +0300 |
| commit | bd5f5f4ecb78e2698dad655645b6d6a2f7012a8c (patch) | |
| tree | 3d3bc441f14e2494ada5a37143f5fd190075f540 /include | |
| parent | b16d9aa4c2b90af8d2c3201e245150f8c430c3bc (diff) | |
| download | linux-bd5f5f4ecb78e2698dad655645b6d6a2f7012a8c.tar.xz | |
bpf: Add BPF_MAP_GET_FD_BY_ID
Add BPF_MAP_GET_FD_BY_ID command to allow user to get a fd
from a bpf_map's ID.
bpf_map_inc_not_zero() is added and is called with map_idr_lock
held.
__bpf_map_put() is also added which has the 'bool do_idr_lock'
param to decide if the map_idr_lock should be acquired when
freeing the map->id.
In the error path of bpf_map_inc_not_zero(), it may have to
call __bpf_map_put(map, false) which does not need
to take the map_idr_lock when freeing the map->id.
It is currently limited to CAP_SYS_ADMIN which we can
consider to lift it in followup patches.
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Acked-by: Alexei Starovoitov <ast@fb.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
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 d70cfed19d5e..dd23f47ff00c 100644 --- a/include/uapi/linux/bpf.h +++ b/include/uapi/linux/bpf.h @@ -85,6 +85,7 @@ enum bpf_cmd { BPF_PROG_GET_NEXT_ID, BPF_MAP_GET_NEXT_ID, BPF_PROG_GET_FD_BY_ID, + BPF_MAP_GET_FD_BY_ID, }; enum bpf_map_type { @@ -217,6 +218,7 @@ union bpf_attr { union { __u32 start_id; __u32 prog_id; + __u32 map_id; }; __u32 next_id; }; |