summaryrefslogtreecommitdiff
path: root/kernel/bpf/arraymap.c
diff options
context:
space:
mode:
Diffstat (limited to 'kernel/bpf/arraymap.c')
-rw-r--r--kernel/bpf/arraymap.c70
1 files changed, 35 insertions, 35 deletions
diff --git a/kernel/bpf/arraymap.c b/kernel/bpf/arraymap.c
index 6cdbb4c33d31..1eeb31c5b317 100644
--- a/kernel/bpf/arraymap.c
+++ b/kernel/bpf/arraymap.c
@@ -12,6 +12,7 @@
#include <uapi/linux/btf.h>
#include <linux/rcupdate_trace.h>
#include <linux/btf_ids.h>
+#include <crypto/sha2.h>
#include "map_in_map.h"
@@ -174,6 +175,17 @@ static void *array_map_lookup_elem(struct bpf_map *map, void *key)
return array->value + (u64)array->elem_size * (index & array->index_mask);
}
+static int array_map_get_hash(struct bpf_map *map, u32 hash_buf_size,
+ void *hash_buf)
+{
+ struct bpf_array *array = container_of(map, struct bpf_array, map);
+
+ sha256(array->value, (u64)array->elem_size * array->map.max_entries,
+ hash_buf);
+ memcpy(array->map.sha, hash_buf, sizeof(array->map.sha));
+ return 0;
+}
+
static int array_map_direct_value_addr(const struct bpf_map *map, u64 *imm,
u32 off)
{
@@ -323,18 +335,17 @@ int bpf_percpu_array_copy(struct bpf_map *map, void *key, void *value)
}
/* Called from syscall */
-static int array_map_get_next_key(struct bpf_map *map, void *key, void *next_key)
+int bpf_array_get_next_key(struct bpf_map *map, void *key, void *next_key)
{
- struct bpf_array *array = container_of(map, struct bpf_array, map);
u32 index = key ? *(u32 *)key : U32_MAX;
u32 *next = (u32 *)next_key;
- if (index >= array->map.max_entries) {
+ if (index >= map->max_entries) {
*next = 0;
return 0;
}
- if (index == array->map.max_entries - 1)
+ if (index == map->max_entries - 1)
return -ENOENT;
*next = index + 1;
@@ -431,22 +442,17 @@ static void *array_map_vmalloc_addr(struct bpf_array *array)
return (void *)round_down((unsigned long)array, PAGE_SIZE);
}
-static void array_map_free_timers_wq(struct bpf_map *map)
+static void array_map_free_internal_structs(struct bpf_map *map)
{
struct bpf_array *array = container_of(map, struct bpf_array, map);
int i;
- /* We don't reset or free fields other than timer and workqueue
- * on uref dropping to zero.
- */
- if (btf_record_has_field(map->record, BPF_TIMER | BPF_WORKQUEUE)) {
- for (i = 0; i < array->map.max_entries; i++) {
- if (btf_record_has_field(map->record, BPF_TIMER))
- bpf_obj_free_timer(map->record, array_map_elem_ptr(array, i));
- if (btf_record_has_field(map->record, BPF_WORKQUEUE))
- bpf_obj_free_workqueue(map->record, array_map_elem_ptr(array, i));
- }
- }
+ /* We only free internal structs on uref dropping to zero */
+ if (!bpf_map_has_internal_structs(map))
+ return;
+
+ for (i = 0; i < array->map.max_entries; i++)
+ bpf_map_free_internal_structs(map, array_map_elem_ptr(array, i));
}
/* Called when map->refcnt goes to zero, either from workqueue or from syscall */
@@ -530,8 +536,6 @@ static int array_map_check_btf(const struct bpf_map *map,
const struct btf_type *key_type,
const struct btf_type *value_type)
{
- u32 int_data;
-
/* One exception for keyless BTF: .bss/.data/.rodata map */
if (btf_type_is_void(key_type)) {
if (map->map_type != BPF_MAP_TYPE_ARRAY ||
@@ -544,14 +548,11 @@ static int array_map_check_btf(const struct bpf_map *map,
return 0;
}
- if (BTF_INFO_KIND(key_type->info) != BTF_KIND_INT)
- return -EINVAL;
-
- int_data = *(u32 *)(key_type + 1);
- /* bpf array can only take a u32 key. This check makes sure
+ /*
+ * Bpf array can only take a u32 key. This check makes sure
* that the btf matches the attr used during map_create.
*/
- if (BTF_INT_BITS(int_data) != 32 || BTF_INT_OFFSET(int_data))
+ if (!btf_type_is_i32(key_type))
return -EINVAL;
return 0;
@@ -735,13 +736,13 @@ static long bpf_for_each_array_elem(struct bpf_map *map, bpf_callback_t callback
u64 ret = 0;
void *val;
+ cant_migrate();
+
if (flags != 0)
return -EINVAL;
is_percpu = map->map_type == BPF_MAP_TYPE_PERCPU_ARRAY;
array = container_of(map, struct bpf_array, map);
- if (is_percpu)
- migrate_disable();
for (i = 0; i < map->max_entries; i++) {
if (is_percpu)
val = this_cpu_ptr(array->pptrs[i]);
@@ -756,8 +757,6 @@ static long bpf_for_each_array_elem(struct bpf_map *map, bpf_callback_t callback
break;
}
- if (is_percpu)
- migrate_enable();
return num_elems;
}
@@ -789,8 +788,8 @@ 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,
- .map_release_uref = array_map_free_timers_wq,
+ .map_get_next_key = bpf_array_get_next_key,
+ .map_release_uref = array_map_free_internal_structs,
.map_lookup_elem = array_map_lookup_elem,
.map_update_elem = array_map_update_elem,
.map_delete_elem = array_map_delete_elem,
@@ -807,6 +806,7 @@ const struct bpf_map_ops array_map_ops = {
.map_mem_usage = array_map_mem_usage,
.map_btf_id = &array_map_btf_ids[0],
.iter_seq_info = &iter_seq_info,
+ .map_get_hash = &array_map_get_hash,
};
const struct bpf_map_ops percpu_array_map_ops = {
@@ -814,7 +814,7 @@ 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,
+ .map_get_next_key = bpf_array_get_next_key,
.map_lookup_elem = percpu_array_map_lookup_elem,
.map_gen_lookup = percpu_array_map_gen_lookup,
.map_update_elem = array_map_update_elem,
@@ -1203,7 +1203,7 @@ const struct bpf_map_ops prog_array_map_ops = {
.map_poke_track = prog_array_map_poke_track,
.map_poke_untrack = prog_array_map_poke_untrack,
.map_poke_run = prog_array_map_poke_run,
- .map_get_next_key = array_map_get_next_key,
+ .map_get_next_key = bpf_array_get_next_key,
.map_lookup_elem = fd_array_map_lookup_elem,
.map_delete_elem = fd_array_map_delete_elem,
.map_fd_get_ptr = prog_fd_array_get_ptr,
@@ -1307,7 +1307,7 @@ const struct bpf_map_ops perf_event_array_map_ops = {
.map_alloc_check = fd_array_map_alloc_check,
.map_alloc = array_map_alloc,
.map_free = perf_event_fd_array_map_free,
- .map_get_next_key = array_map_get_next_key,
+ .map_get_next_key = bpf_array_get_next_key,
.map_lookup_elem = fd_array_map_lookup_elem,
.map_delete_elem = fd_array_map_delete_elem,
.map_fd_get_ptr = perf_event_fd_array_get_ptr,
@@ -1343,7 +1343,7 @@ const struct bpf_map_ops cgroup_array_map_ops = {
.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_get_next_key = bpf_array_get_next_key,
.map_lookup_elem = fd_array_map_lookup_elem,
.map_delete_elem = fd_array_map_delete_elem,
.map_fd_get_ptr = cgroup_fd_array_get_ptr,
@@ -1428,7 +1428,7 @@ 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,
+ .map_get_next_key = bpf_array_get_next_key,
.map_lookup_elem = array_of_map_lookup_elem,
.map_delete_elem = fd_array_map_delete_elem,
.map_fd_get_ptr = bpf_map_fd_get_ptr,
generated by cgit (git 2.34.1) at 2025-12-22 09:58:13 +0000