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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Cryptographic API for algorithms (i.e., low-level API).
*
* Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
*/
#ifndef _CRYPTO_ALGAPI_H
#define _CRYPTO_ALGAPI_H
#include <crypto/utils.h>
#include <linux/align.h>
#include <linux/cache.h>
#include <linux/crypto.h>
#include <linux/types.h>
#include <linux/workqueue.h>
/*
* Maximum values for blocksize and alignmask, used to allocate
* static buffers that are big enough for any combination of
* algs and architectures. Ciphers have a lower maximum size.
*/
#define MAX_ALGAPI_BLOCKSIZE 160
#define MAX_ALGAPI_ALIGNMASK 127
#define MAX_CIPHER_BLOCKSIZE 16
#define MAX_CIPHER_ALIGNMASK 15
#ifdef ARCH_DMA_MINALIGN
#define CRYPTO_DMA_ALIGN ARCH_DMA_MINALIGN
#else
#define CRYPTO_DMA_ALIGN CRYPTO_MINALIGN
#endif
#define CRYPTO_DMA_PADDING ((CRYPTO_DMA_ALIGN - 1) & ~(CRYPTO_MINALIGN - 1))
/*
* Autoloaded crypto modules should only use a prefixed name to avoid allowing
* arbitrary modules to be loaded. Loading from userspace may still need the
* unprefixed names, so retains those aliases as well.
* This uses __MODULE_INFO directly instead of MODULE_ALIAS because pre-4.3
* gcc (e.g. avr32 toolchain) uses __LINE__ for uniqueness, and this macro
* expands twice on the same line. Instead, use a separate base name for the
* alias.
*/
#define MODULE_ALIAS_CRYPTO(name) \
__MODULE_INFO(alias, alias_userspace, name); \
__MODULE_INFO(alias, alias_crypto, "crypto-" name)
struct crypto_aead;
struct crypto_instance;
struct module;
struct notifier_block;
struct rtattr;
struct scatterlist;
struct seq_file;
struct sk_buff;
struct crypto_type {
unsigned int (*ctxsize)(struct crypto_alg *alg, u32 type, u32 mask);
unsigned int (*extsize)(struct crypto_alg *alg);
int (*init_tfm)(struct crypto_tfm *tfm);
void (*show)(struct seq_file *m, struct crypto_alg *alg);
int (*report)(struct sk_buff *skb, struct crypto_alg *alg);
void (*free)(struct crypto_instance *inst);
#ifdef CONFIG_CRYPTO_STATS
int (*report_stat)(struct sk_buff *skb, struct crypto_alg *alg);
#endif
unsigned int type;
unsigned int maskclear;
unsigned int maskset;
unsigned int tfmsize;
};
struct crypto_instance {
struct crypto_alg alg;
struct crypto_template *tmpl;
union {
/* Node in list of instances after registration. */
struct hlist_node list;
/* List of attached spawns before registration. */
struct crypto_spawn *spawns;
};
struct work_struct free_work;
void *__ctx[] CRYPTO_MINALIGN_ATTR;
};
struct crypto_template {
struct list_head list;
struct hlist_head instances;
struct module *module;
int (*create)(struct crypto_template *tmpl, struct rtattr **tb);
char name[CRYPTO_MAX_ALG_NAME];
};
struct crypto_spawn {
struct list_head list;
struct crypto_alg *alg;
union {
/* Back pointer to instance after registration.*/
struct crypto_instance *inst;
/* Spawn list pointer prior to registration. */
struct crypto_spawn *next;
};
const struct crypto_type *frontend;
u32 mask;
bool dead;
bool registered;
};
struct crypto_queue {
struct list_head list;
struct list_head *backlog;
unsigned int qlen;
unsigned int max_qlen;
};
struct scatter_walk {
struct scatterlist *sg;
unsigned int offset;
};
struct crypto_attr_alg {
char name[CRYPTO_MAX_ALG_NAME];
};
struct crypto_attr_type {
u32 type;
u32 mask;
};
/*
* Algorithm registration interface.
*/
int crypto_register_alg(struct crypto_alg *alg);
void crypto_unregister_alg(struct crypto_alg *alg);
int crypto_register_algs(struct crypto_alg *algs, int count);
void crypto_unregister_algs(struct crypto_alg *algs, int count);
void crypto_mod_put(struct crypto_alg *alg);
int crypto_register_template(struct crypto_template *tmpl);
int crypto_register_templates(struct crypto_template *tmpls, int count);
void crypto_unregister_template(struct crypto_template *tmpl);
void crypto_unregister_templates(struct crypto_template *tmpls, int count);
struct crypto_template *crypto_lookup_template(const char *name);
int crypto_register_instance(struct crypto_template *tmpl,
struct crypto_instance *inst);
void crypto_unregister_instance(struct crypto_instance *inst);
int crypto_grab_spawn(struct crypto_spawn *spawn, struct crypto_instance *inst,
const char *name, u32 type, u32 mask);
void crypto_drop_spawn(struct crypto_spawn *spawn);
struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
u32 mask);
void *crypto_spawn_tfm2(struct crypto_spawn *spawn);
struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb);
int crypto_check_attr_type(struct rtattr **tb, u32 type, u32 *mask_ret);
const char *crypto_attr_alg_name(struct rtattr *rta);
int crypto_inst_setname(struct crypto_instance *inst, const char *name,
struct crypto_alg *alg);
void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen);
int crypto_enqueue_request(struct crypto_queue *queue,
struct crypto_async_request *request);
void crypto_enqueue_request_head(struct crypto_queue *queue,
struct crypto_async_request *request);
struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue);
static inline unsigned int crypto_queue_len(struct crypto_queue *queue)
{
return queue->qlen;
}
void crypto_inc(u8 *a, unsigned int size);
static inline void *crypto_tfm_ctx(struct crypto_tfm *tfm)
{
return tfm->__crt_ctx;
}
static inline void *crypto_tfm_ctx_align(struct crypto_tfm *tfm,
unsigned int align)
{
if (align <= crypto_tfm_ctx_alignment())
align = 1;
return PTR_ALIGN(crypto_tfm_ctx(tfm), align);
}
static inline unsigned int crypto_dma_align(void)
{
return CRYPTO_DMA_ALIGN;
}
static inline unsigned int crypto_dma_padding(void)
{
return (crypto_dma_align() - 1) & ~(crypto_tfm_ctx_alignment() - 1);
}
static inline void *crypto_tfm_ctx_dma(struct crypto_tfm *tfm)
{
return crypto_tfm_ctx_align(tfm, crypto_dma_align());
}
static inline struct crypto_instance *crypto_tfm_alg_instance(
struct crypto_tfm *tfm)
{
return container_of(tfm->__crt_alg, struct crypto_instance, alg);
}
static inline void *crypto_instance_ctx(struct crypto_instance *inst)
{
return inst->__ctx;
}
static inline struct crypto_async_request *crypto_get_backlog(
struct crypto_queue *queue)
{
return queue->backlog == &queue->list ? NULL :
container_of(queue->backlog, struct crypto_async_request, list);
}
static inline u32 crypto_requires_off(struct crypto_attr_type *algt, u32 off)
{
return (algt->type ^ off) & algt->mask & off;
}
/*
* When an algorithm uses another algorithm (e.g., if it's an instance of a
* template), these are the flags that should always be set on the "outer"
* algorithm if any "inner" algorithm has them set.
*/
#define CRYPTO_ALG_INHERITED_FLAGS \
(CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK | \
CRYPTO_ALG_ALLOCATES_MEMORY)
/*
* Given the type and mask that specify the flags restrictions on a template
* instance being created, return the mask that should be passed to
* crypto_grab_*() (along with type=0) to honor any request the user made to
* have any of the CRYPTO_ALG_INHERITED_FLAGS clear.
*/
static inline u32 crypto_algt_inherited_mask(struct crypto_attr_type *algt)
{
return crypto_requires_off(algt, CRYPTO_ALG_INHERITED_FLAGS);
}
int crypto_register_notifier(struct notifier_block *nb);
int crypto_unregister_notifier(struct notifier_block *nb);
/* Crypto notification events. */
enum {
CRYPTO_MSG_ALG_REQUEST,
CRYPTO_MSG_ALG_REGISTER,
CRYPTO_MSG_ALG_LOADED,
};
static inline void crypto_request_complete(struct crypto_async_request *req,
int err)
{
req->complete(req->data, err);
}
static inline u32 crypto_tfm_alg_type(struct crypto_tfm *tfm)
{
return tfm->__crt_alg->cra_flags & CRYPTO_ALG_TYPE_MASK;
}
#endif /* _CRYPTO_ALGAPI_H */
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