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Commit 3b4a63f6 authored by Prashant Bhole's avatar Prashant Bhole Committed by Alexei Starovoitov
Browse files

bpf: return EOPNOTSUPP when map lookup isn't supported 



Return ERR_PTR(-EOPNOTSUPP) from map_lookup_elem() methods of below
map types:
- BPF_MAP_TYPE_PROG_ARRAY
- BPF_MAP_TYPE_STACK_TRACE
- BPF_MAP_TYPE_XSKMAP
- BPF_MAP_TYPE_SOCKMAP/BPF_MAP_TYPE_SOCKHASH

Signed-off-by: default avatarPrashant Bhole <bhole_prashant_q7@lab.ntt.co.jp>
Acked-by: default avatarAlexei Starovoitov <ast@kernel.org>
Acked-by: default avatarSong Liu <songliubraving@fb.com>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent 509db283

kernel/bpf/arraymap.c

+1 −1
Original line number Diff line number Diff line
@@ -449,7 +449,7 @@ static void fd_array_map_free(struct bpf_map *map) 


static void *fd_array_map_lookup_elem(struct bpf_map *map, void *key)

{

	return NULL;

	return ERR_PTR(-EOPNOTSUPP);

}



/* only called from syscall */

kernel/bpf/sockmap.c

+1 −1
Original line number Diff line number Diff line
@@ -2096,7 +2096,7 @@ int sockmap_get_from_fd(const union bpf_attr *attr, int type, 


static void *sock_map_lookup(struct bpf_map *map, void *key)

{

	return NULL;

	return ERR_PTR(-EOPNOTSUPP);

}



static int sock_map_update_elem(struct bpf_map *map,

kernel/bpf/stackmap.c

+1 −1
Original line number Diff line number Diff line
@@ -505,7 +505,7 @@ const struct bpf_func_proto bpf_get_stack_proto = { 
/* Called from eBPF program */

static void *stack_map_lookup_elem(struct bpf_map *map, void *key)

{

	return NULL;

	return ERR_PTR(-EOPNOTSUPP);

}



/* Called from syscall */

kernel/bpf/xskmap.c

+1 −1
Original line number Diff line number Diff line
@@ -154,7 +154,7 @@ void __xsk_map_flush(struct bpf_map *map) 


static void *xsk_map_lookup_elem(struct bpf_map *map, void *key)

{

	return NULL;

	return ERR_PTR(-EOPNOTSUPP);

}



static int xsk_map_update_elem(struct bpf_map *map, void *key, void *value,