bpf: pass struct btf pointer to the map_check_btf() callback

If key_type or value_type are of non-trivial data types
(e.g. structure or typedef), it's not possible to check them without
the additional information, which can't be obtained without a pointer
to the btf structure.

So, let's pass btf pointer to the map_check_btf() callbacks.

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>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Roman Gushchin 2018-12-10 15:43:00 -08:00 коммит произвёл Alexei Starovoitov
Родитель a0517a0f7e
Коммит 1b2b234b13
4 изменённых файлов: 7 добавлений и 1 удалений

Просмотреть файл

@ -23,6 +23,7 @@ struct bpf_prog;
struct bpf_map;
struct sock;
struct seq_file;
struct btf;
struct btf_type;
/* map is generic key/value storage optionally accesible by eBPF programs */
@ -52,6 +53,7 @@ struct bpf_map_ops {
void (*map_seq_show_elem)(struct bpf_map *map, void *key,
struct seq_file *m);
int (*map_check_btf)(const struct bpf_map *map,
const struct btf *btf,
const struct btf_type *key_type,
const struct btf_type *value_type);
};
@ -126,6 +128,7 @@ static inline bool bpf_map_support_seq_show(const struct bpf_map *map)
}
int map_check_no_btf(const struct bpf_map *map,
const struct btf *btf,
const struct btf_type *key_type,
const struct btf_type *value_type);

Просмотреть файл

@ -382,6 +382,7 @@ static void percpu_array_map_seq_show_elem(struct bpf_map *map, void *key,
}
static int array_map_check_btf(const struct bpf_map *map,
const struct btf *btf,
const struct btf_type *key_type,
const struct btf_type *value_type)
{

Просмотреть файл

@ -728,6 +728,7 @@ free_stack:
}
static int trie_check_btf(const struct bpf_map *map,
const struct btf *btf,
const struct btf_type *key_type,
const struct btf_type *value_type)
{

Просмотреть файл

@ -456,6 +456,7 @@ static int bpf_obj_name_cpy(char *dst, const char *src)
}
int map_check_no_btf(const struct bpf_map *map,
const struct btf *btf,
const struct btf_type *key_type,
const struct btf_type *value_type)
{
@ -478,7 +479,7 @@ static int map_check_btf(const struct bpf_map *map, const struct btf *btf,
return -EINVAL;
if (map->ops->map_check_btf)
ret = map->ops->map_check_btf(map, key_type, value_type);
ret = map->ops->map_check_btf(map, btf, key_type, value_type);
return ret;
}