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bpf: arraymap: move checks out of alloc function 

Use the new callback to perform allocation checks for array maps.
The fd maps don't need a special allocation callback, they only
need a special check callback.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Jakub Kicinski 2018-01-17 19:13:25 -08:00 committed by Daniel Borkmann
parent 0c91c4239d
commit ad46061fca
1 changed files with 34 additions and 20 deletions
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54
kernel/bpf/arraymap.c
View File

@ -49,6 +49,27 @@ static int bpf_array_alloc_percpu(struct bpf_array *array)
}
/* Called from syscall */
static int array_map_alloc_check(union bpf_attr *attr)
{
bool percpu = attr->map_type == BPF_MAP_TYPE_PERCPU_ARRAY;
int numa_node = bpf_map_attr_numa_node(attr);
/* check sanity of attributes */
if (attr->max_entries == 0 || attr->key_size != 4 ||
attr->value_size == 0 ||
attr->map_flags & ~ARRAY_CREATE_FLAG_MASK ||
(percpu && numa_node != NUMA_NO_NODE))
return -EINVAL;
if (attr->value_size > KMALLOC_MAX_SIZE)
/* if value_size is bigger, the user space won't be able to
* access the elements.
*/
return -E2BIG;
return 0;
}
static struct bpf_map *array_map_alloc(union bpf_attr *attr)
{
bool percpu = attr->map_type == BPF_MAP_TYPE_PERCPU_ARRAY;
@ -58,19 +79,6 @@ static struct bpf_map *array_map_alloc(union bpf_attr *attr)
struct bpf_array *array;
u64 array_size, mask64;
/* check sanity of attributes */
if (attr->max_entries == 0 || attr->key_size != 4 ||
attr->value_size == 0 ||
attr->map_flags & ~ARRAY_CREATE_FLAG_MASK ||
(percpu && numa_node != NUMA_NO_NODE))
return ERR_PTR(-EINVAL);
if (attr->value_size > KMALLOC_MAX_SIZE)
/* if value_size is bigger, the user space won't be able to
* access the elements.
*/
return ERR_PTR(-E2BIG);
elem_size = round_up(attr->value_size, 8);
max_entries = attr->max_entries;
@ -327,6 +335,7 @@ static void array_map_free(struct bpf_map *map)
}
const struct bpf_map_ops array_map_ops = {
.map_alloc_check = array_map_alloc_check,
.map_alloc = array_map_alloc,
.map_free = array_map_free,
.map_get_next_key = array_map_get_next_key,
@ -337,6 +346,7 @@ const struct bpf_map_ops array_map_ops = {
};
const struct bpf_map_ops percpu_array_map_ops = {
.map_alloc_check = array_map_alloc_check,
.map_alloc = array_map_alloc,
.map_free = array_map_free,
.map_get_next_key = array_map_get_next_key,
@ -345,12 +355,12 @@ const struct bpf_map_ops percpu_array_map_ops = {
.map_delete_elem = array_map_delete_elem,
};
static struct bpf_map *fd_array_map_alloc(union bpf_attr *attr)
static int fd_array_map_alloc_check(union bpf_attr *attr)
{
/* only file descriptors can be stored in this type of map */
if (attr->value_size != sizeof(u32))
return ERR_PTR(-EINVAL);
return array_map_alloc(attr);
return -EINVAL;
return array_map_alloc_check(attr);
}
static void fd_array_map_free(struct bpf_map *map)
@ -474,7 +484,8 @@ void bpf_fd_array_map_clear(struct bpf_map *map)
}
const struct bpf_map_ops prog_array_map_ops = {
.map_alloc = fd_array_map_alloc,
.map_alloc_check = fd_array_map_alloc_check,
.map_alloc = array_map_alloc,
.map_free = fd_array_map_free,
.map_get_next_key = array_map_get_next_key,
.map_lookup_elem = fd_array_map_lookup_elem,
@ -561,7 +572,8 @@ static void perf_event_fd_array_release(struct bpf_map *map,
}
const struct bpf_map_ops perf_event_array_map_ops = {
.map_alloc = fd_array_map_alloc,
.map_alloc_check = fd_array_map_alloc_check,
.map_alloc = array_map_alloc,
.map_free = fd_array_map_free,
.map_get_next_key = array_map_get_next_key,
.map_lookup_elem = fd_array_map_lookup_elem,
@ -592,7 +604,8 @@ static void cgroup_fd_array_free(struct bpf_map *map)
}
const struct bpf_map_ops cgroup_array_map_ops = {
.map_alloc = fd_array_map_alloc,
.map_alloc_check = fd_array_map_alloc_check,
.map_alloc = array_map_alloc,
.map_free = cgroup_fd_array_free,
.map_get_next_key = array_map_get_next_key,
.map_lookup_elem = fd_array_map_lookup_elem,
@ -610,7 +623,7 @@ static struct bpf_map *array_of_map_alloc(union bpf_attr *attr)
if (IS_ERR(inner_map_meta))
return inner_map_meta;
map = fd_array_map_alloc(attr);
map = array_map_alloc(attr);
if (IS_ERR(map)) {
bpf_map_meta_free(inner_map_meta);
return map;
@ -673,6 +686,7 @@ static u32 array_of_map_gen_lookup(struct bpf_map *map,
}
const struct bpf_map_ops array_of_maps_map_ops = {
.map_alloc_check = fd_array_map_alloc_check,
.map_alloc = array_of_map_alloc,
.map_free = array_of_map_free,
.map_get_next_key = array_map_get_next_key,