1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* Copyright (c) 2024 Meta Platforms, Inc. and affiliates. */
3
4 #ifndef _CRYPTO_COMMON_H
5 #define _CRYPTO_COMMON_H
6
7 #include "errno.h"
8 #include <stdbool.h>
9
10 struct bpf_crypto_ctx *bpf_crypto_ctx_create(const struct bpf_crypto_params *params,
11 u32 params__sz, int *err) __ksym;
12 struct bpf_crypto_ctx *bpf_crypto_ctx_acquire(struct bpf_crypto_ctx *ctx) __ksym;
13 void bpf_crypto_ctx_release(struct bpf_crypto_ctx *ctx) __ksym;
14 int bpf_crypto_encrypt(struct bpf_crypto_ctx *ctx, const struct bpf_dynptr *src,
15 const struct bpf_dynptr *dst, const struct bpf_dynptr *iv) __ksym;
16 int bpf_crypto_decrypt(struct bpf_crypto_ctx *ctx, const struct bpf_dynptr *src,
17 const struct bpf_dynptr *dst, const struct bpf_dynptr *iv) __ksym;
18
19 struct __crypto_ctx_value {
20 struct bpf_crypto_ctx __kptr * ctx;
21 };
22
23 struct array_map {
24 __uint(type, BPF_MAP_TYPE_ARRAY);
25 __type(key, int);
26 __type(value, struct __crypto_ctx_value);
27 __uint(max_entries, 1);
28 } __crypto_ctx_map SEC(".maps");
29
30 static inline struct __crypto_ctx_value *crypto_ctx_value_lookup(void)
31 {
32 u32 key = 0;
33
34 return bpf_map_lookup_elem(&__crypto_ctx_map, &key);
35 }
36
37 static inline int crypto_ctx_insert(struct bpf_crypto_ctx *ctx)
38 {
39 struct __crypto_ctx_value local, *v;
40 struct bpf_crypto_ctx *old;
41 u32 key = 0;
42 int err;
43
44 local.ctx = NULL;
45 err = bpf_map_update_elem(&__crypto_ctx_map, &key, &local, 0);
46 if (err) {
47 bpf_crypto_ctx_release(ctx);
48 return err;
49 }
50
51 v = bpf_map_lookup_elem(&__crypto_ctx_map, &key);
52 if (!v) {
53 bpf_crypto_ctx_release(ctx);
54 return -ENOENT;
55 }
56
57 old = bpf_kptr_xchg(&v->ctx, ctx);
58 if (old) {
59 bpf_crypto_ctx_release(old);
60 return -EEXIST;
61 }
62
63 return 0;
64 }
65
66 #endif /* _CRYPTO_COMMON_H */
67
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