e2ddf25269
This reverts commit 90c445799f which is
commit 876673364161da50eed6b472d746ef88242b2368 upstream.
It breaks the Android kernel build AND the kernel abi and can be brought
back in the future in an abi-safe way if it is really needed.
Bug: 161946584
Change-Id: I8c7820bcca06e847cdc7c894005d383a2ac828a0
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
115 lines
2.7 KiB
C
115 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/* Copyright (c) 2017 Facebook
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*/
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#include <linux/slab.h>
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#include <linux/bpf.h>
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#include "map_in_map.h"
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struct bpf_map *bpf_map_meta_alloc(int inner_map_ufd)
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{
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struct bpf_map *inner_map, *inner_map_meta;
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u32 inner_map_meta_size;
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struct fd f;
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f = fdget(inner_map_ufd);
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inner_map = __bpf_map_get(f);
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if (IS_ERR(inner_map))
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return inner_map;
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/* Does not support >1 level map-in-map */
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if (inner_map->inner_map_meta) {
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fdput(f);
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return ERR_PTR(-EINVAL);
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}
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if (!inner_map->ops->map_meta_equal) {
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fdput(f);
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return ERR_PTR(-ENOTSUPP);
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}
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if (map_value_has_spin_lock(inner_map)) {
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fdput(f);
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return ERR_PTR(-ENOTSUPP);
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}
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inner_map_meta_size = sizeof(*inner_map_meta);
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/* In some cases verifier needs to access beyond just base map. */
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if (inner_map->ops == &array_map_ops)
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inner_map_meta_size = sizeof(struct bpf_array);
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inner_map_meta = kzalloc(inner_map_meta_size, GFP_USER);
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if (!inner_map_meta) {
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fdput(f);
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return ERR_PTR(-ENOMEM);
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}
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inner_map_meta->map_type = inner_map->map_type;
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inner_map_meta->key_size = inner_map->key_size;
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inner_map_meta->value_size = inner_map->value_size;
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inner_map_meta->map_flags = inner_map->map_flags;
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inner_map_meta->max_entries = inner_map->max_entries;
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inner_map_meta->spin_lock_off = inner_map->spin_lock_off;
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/* Misc members not needed in bpf_map_meta_equal() check. */
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inner_map_meta->ops = inner_map->ops;
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if (inner_map->ops == &array_map_ops) {
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inner_map_meta->bypass_spec_v1 = inner_map->bypass_spec_v1;
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container_of(inner_map_meta, struct bpf_array, map)->index_mask =
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container_of(inner_map, struct bpf_array, map)->index_mask;
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}
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fdput(f);
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return inner_map_meta;
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}
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void bpf_map_meta_free(struct bpf_map *map_meta)
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{
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kfree(map_meta);
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}
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bool bpf_map_meta_equal(const struct bpf_map *meta0,
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const struct bpf_map *meta1)
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{
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/* No need to compare ops because it is covered by map_type */
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return meta0->map_type == meta1->map_type &&
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meta0->key_size == meta1->key_size &&
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meta0->value_size == meta1->value_size &&
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meta0->map_flags == meta1->map_flags;
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}
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void *bpf_map_fd_get_ptr(struct bpf_map *map,
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struct file *map_file /* not used */,
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int ufd)
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{
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struct bpf_map *inner_map, *inner_map_meta;
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struct fd f;
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f = fdget(ufd);
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inner_map = __bpf_map_get(f);
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if (IS_ERR(inner_map))
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return inner_map;
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inner_map_meta = map->inner_map_meta;
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if (inner_map_meta->ops->map_meta_equal(inner_map_meta, inner_map))
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bpf_map_inc(inner_map);
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else
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inner_map = ERR_PTR(-EINVAL);
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fdput(f);
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return inner_map;
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}
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void bpf_map_fd_put_ptr(void *ptr)
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{
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/* ptr->ops->map_free() has to go through one
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* rcu grace period by itself.
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*/
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bpf_map_put(ptr);
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}
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u32 bpf_map_fd_sys_lookup_elem(void *ptr)
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{
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return ((struct bpf_map *)ptr)->id;
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}
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