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/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright (c) 2024 Meta Platforms, Inc. and affiliates. */
#ifndef _CRYPTO_COMMON_H
#define _CRYPTO_COMMON_H
#include "errno.h"
#include <stdbool.h>
struct bpf_crypto_ctx *bpf_crypto_ctx_create(const struct bpf_crypto_params *params,
u32 params__sz, int *err) __ksym;
struct bpf_crypto_ctx *bpf_crypto_ctx_acquire(struct bpf_crypto_ctx *ctx) __ksym;
void bpf_crypto_ctx_release(struct bpf_crypto_ctx *ctx) __ksym;
int bpf_crypto_encrypt(struct bpf_crypto_ctx *ctx, const struct bpf_dynptr *src,
const struct bpf_dynptr *dst, const struct bpf_dynptr *iv) __ksym;
int bpf_crypto_decrypt(struct bpf_crypto_ctx *ctx, const struct bpf_dynptr *src,
const struct bpf_dynptr *dst, const struct bpf_dynptr *iv) __ksym;
struct __crypto_ctx_value {
struct bpf_crypto_ctx __kptr * ctx;
};
struct array_map {
__uint(type, BPF_MAP_TYPE_ARRAY);
__type(key, int);
__type(value, struct __crypto_ctx_value);
__uint(max_entries, 1);
} __crypto_ctx_map SEC(".maps");
static inline struct __crypto_ctx_value *crypto_ctx_value_lookup(void)
{
u32 key = 0;
return bpf_map_lookup_elem(&__crypto_ctx_map, &key);
}
static inline int crypto_ctx_insert(struct bpf_crypto_ctx *ctx)
{
struct __crypto_ctx_value local, *v;
struct bpf_crypto_ctx *old;
u32 key = 0;
int err;
local.ctx = NULL;
err = bpf_map_update_elem(&__crypto_ctx_map, &key, &local, 0);
if (err) {
bpf_crypto_ctx_release(ctx);
return err;
}
v = bpf_map_lookup_elem(&__crypto_ctx_map, &key);
if (!v) {
bpf_crypto_ctx_release(ctx);
return -ENOENT;
}
old = bpf_kptr_xchg(&v->ctx, ctx);
if (old) {
bpf_crypto_ctx_release(old);
return -EEXIST;
}
return 0;
}
#endif /* _CRYPTO_COMMON_H */
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