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bpf: Add map_name to bpf_map_info 

This patch allows userspace to specify a name for a map
during BPF_MAP_CREATE.

The map's name can later be exported to user space
via BPF_OBJ_GET_INFO_BY_FD.

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>
This commit is contained in:
Martin KaFai Lau 2017-09-27 14:37:53 -07:00 committed by David S. Miller
parent cb4d2b3f03
commit ad5b177bd7
3 changed files with 9 additions and 1 deletions
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1
include/linux/bpf.h
View File

@ -56,6 +56,7 @@ struct bpf_map {
struct work_struct work;
atomic_t usercnt;
struct bpf_map *inner_map_meta;
u8 name[BPF_OBJ_NAME_LEN];
};
/* function argument constraints */

2
include/uapi/linux/bpf.h
View File

@ -190,6 +190,7 @@ union bpf_attr {
__u32 numa_node; /* numa node (effective only if
* BPF_F_NUMA_NODE is set).
*/
__u8 map_name[BPF_OBJ_NAME_LEN];
};
struct { /* anonymous struct used by BPF_MAP_*_ELEM commands */
@ -829,6 +830,7 @@ struct bpf_map_info {
__u32 value_size;
__u32 max_entries;
__u32 map_flags;
__u8 name[BPF_OBJ_NAME_LEN];
} __attribute__((aligned(8)));
/* User bpf_sock_ops struct to access socket values and specify request ops

7
kernel/bpf/syscall.c
View File

@ -339,7 +339,7 @@ static int bpf_obj_name_cpy(char *dst, const char *src)
return 0;
}
#define BPF_MAP_CREATE_LAST_FIELD numa_node
#define BPF_MAP_CREATE_LAST_FIELD map_name
/* called via syscall */
static int map_create(union bpf_attr *attr)
{
@ -361,6 +361,10 @@ static int map_create(union bpf_attr *attr)
if (IS_ERR(map))
return PTR_ERR(map);
err = bpf_obj_name_cpy(map->name, attr->map_name);
if (err)
goto free_map_nouncharge;
atomic_set(&map->refcnt, 1);
atomic_set(&map->usercnt, 1);
@ -1462,6 +1466,7 @@ static int bpf_map_get_info_by_fd(struct bpf_map *map,
info.value_size = map->value_size;
info.max_entries = map->max_entries;
info.map_flags = map->map_flags;
memcpy(info.name, map->name, sizeof(map->name));
if (copy_to_user(uinfo, &info, info_len) ||
put_user(info_len, &uattr->info.info_len))