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| author | Martin KaFai Lau | 2017-06-28 08:08:34 +0200 |
|---|---|---|
| committer | David S. Miller | 2017-06-29 19:13:25 +0200 |
| commit | 14dc6f04f49dc12614d7e90928b495b8d73cd471 (patch) | |
| tree | 159ebddef04be2ae417c503ab46593be570c680f /kernel/bpf/map_in_map.c | |
| parent | net: stmmac: Add additional registers for dwmac1000_dma ethtool (diff) | |
| download | kernel-qcow2-linux-14dc6f04f49dc12614d7e90928b495b8d73cd471.tar.gz kernel-qcow2-linux-14dc6f04f49dc12614d7e90928b495b8d73cd471.tar.xz kernel-qcow2-linux-14dc6f04f49dc12614d7e90928b495b8d73cd471.zip | |
bpf: Add syscall lookup support for fd array and htab
This patch allows userspace to do BPF_MAP_LOOKUP_ELEM on
BPF_MAP_TYPE_PROG_ARRAY,
BPF_MAP_TYPE_ARRAY_OF_MAPS and
BPF_MAP_TYPE_HASH_OF_MAPS.
The lookup returns a prog-id or map-id to the userspace.
The userspace can then use the BPF_PROG_GET_FD_BY_ID
or BPF_MAP_GET_FD_BY_ID to get a fd.
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'kernel/bpf/map_in_map.c')
| -rw-r--r-- | kernel/bpf/map_in_map.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/kernel/bpf/map_in_map.c b/kernel/bpf/map_in_map.c index 59bcdf821ae4..1da574612bea 100644 --- a/kernel/bpf/map_in_map.c +++ b/kernel/bpf/map_in_map.c @@ -95,3 +95,8 @@ void bpf_map_fd_put_ptr(void *ptr) */ bpf_map_put(ptr); } + +u32 bpf_map_fd_sys_lookup_elem(void *ptr) +{ + return ((struct bpf_map *)ptr)->id; +} |