From 14dc6f04f49dc12614d7e90928b495b8d73cd471 Mon Sep 17 00:00:00 2001 From: Martin KaFai Lau Date: Tue, 27 Jun 2017 23:08:34 -0700 Subject: 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 Acked-by: Daniel Borkmann Signed-off-by: David S. Miller --- kernel/bpf/map_in_map.c | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'kernel/bpf/map_in_map.c') 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; +} -- cgit v1.2.1