algapi.h

/*
 * Cryptographic API for algorithms (i.e., low-level API).
 *
 * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option) 
 * any later version.
 *
 */
#ifndef _CRYPTO_ALGAPI_H
#define _CRYPTO_ALGAPI_H

#include <linux/crypto.h>
#include <linux/list.h>
#include <linux/kernel.h>
#include <linux/kthread.h>
#include <linux/skbuff.h>

struct crypto_aead;
struct crypto_instance;
struct module;
struct rtattr;
struct seq_file;

struct crypto_type {
	unsigned int (*ctxsize)(struct crypto_alg *alg, u32 type, u32 mask);
	unsigned int (*extsize)(struct crypto_alg *alg);
	int (*init)(struct crypto_tfm *tfm, u32 type, u32 mask);
	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);
	struct crypto_alg *(*lookup)(const char *name, u32 type, u32 mask);
	void (*free)(struct crypto_instance *inst);

	unsigned int type;
	unsigned int maskclear;
	unsigned int maskset;
	unsigned int tfmsize;
};

struct crypto_instance {
	struct crypto_alg alg;

	struct crypto_template *tmpl;
	struct hlist_node list;

	void *__ctx[] CRYPTO_MINALIGN_ATTR;
};

struct crypto_template {
	struct list_head list;
	struct hlist_head instances;
	struct module *module;

	struct crypto_instance *(*alloc)(struct rtattr **tb);
	void (*free)(struct crypto_instance *inst);
	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;
	struct crypto_instance *inst;
	const struct crypto_type *frontend;
	u32 mask;
};

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 blkcipher_walk {
	union {
		struct {
			struct page *page;
			unsigned long offset;
		} phys;

		struct {
			u8 *page;
			u8 *addr;
		} virt;
	} src, dst;

	struct scatter_walk in;
	unsigned int nbytes;

	struct scatter_walk out;
	unsigned int total;

	void *page;
	u8 *buffer;
	u8 *iv;
	unsigned int ivsize;

	int flags;
	unsigned int walk_blocksize;
	unsigned int cipher_blocksize;
	unsigned int alignmask;
};

struct ablkcipher_walk {
	struct {
		struct page *page;
		unsigned int offset;
	} src, dst;

	struct scatter_walk	in;
	unsigned int		nbytes;
	struct scatter_walk	out;
	unsigned int		total;
	struct list_head	buffers;
	u8			*iv_buffer;
	u8			*iv;
	int			flags;
	unsigned int		blocksize;
};

#define ENGINE_NAME_LEN	30
/*
 * struct crypto_engine - crypto hardware engine
 * @name: the engine name
 * @idling: the engine is entering idle state
 * @busy: request pump is busy
 * @running: the engine is on working
 * @cur_req_prepared: current request is prepared
 * @list: link with the global crypto engine list
 * @queue_lock: spinlock to syncronise access to request queue
 * @queue: the crypto queue of the engine
 * @rt: whether this queue is set to run as a realtime task
 * @prepare_crypt_hardware: a request will soon arrive from the queue
 * so the subsystem requests the driver to prepare the hardware
 * by issuing this call
 * @unprepare_crypt_hardware: there are currently no more requests on the
 * queue so the subsystem notifies the driver that it may relax the
 * hardware by issuing this call
 * @prepare_request: do some prepare if need before handle the current request
 * @unprepare_request: undo any work done by prepare_message()
 * @crypt_one_request: do encryption for current request
 * @kworker: thread struct for request pump
 * @kworker_task: pointer to task for request pump kworker thread
 * @pump_requests: work struct for scheduling work to the request pump
 * @priv_data: the engine private data
 * @cur_req: the current request which is on processing
 */
struct crypto_engine {
	char			name[ENGINE_NAME_LEN];
	bool			idling;
	bool			busy;
	bool			running;
	bool			cur_req_prepared;

	struct list_head	list;
	spinlock_t		queue_lock;
	struct crypto_queue	queue;

	bool			rt;

	int (*prepare_crypt_hardware)(struct crypto_engine *engine);
	int (*unprepare_crypt_hardware)(struct crypto_engine *engine);

	int (*prepare_request)(struct crypto_engine *engine,
			       struct ablkcipher_request *req);
	int (*unprepare_request)(struct crypto_engine *engine,
				 struct ablkcipher_request *req);
	int (*crypt_one_request)(struct crypto_engine *engine,
				 struct ablkcipher_request *req);

	struct kthread_worker           kworker;
	struct task_struct              *kworker_task;
	struct kthread_work             pump_requests;

	void				*priv_data;
	struct ablkcipher_request	*cur_req;
};

int crypto_transfer_request(struct crypto_engine *engine,
			    struct ablkcipher_request *req, bool need_pump);
int crypto_transfer_request_to_engine(struct crypto_engine *engine,
				      struct ablkcipher_request *req);
void crypto_finalize_request(struct crypto_engine *engine,
			     struct ablkcipher_request *req, int err);
int crypto_engine_start(struct crypto_engine *engine);
int crypto_engine_stop(struct crypto_engine *engine);
struct crypto_engine *crypto_engine_alloc_init(struct device *dev, bool rt);
int crypto_engine_exit(struct crypto_engine *engine);

extern const struct crypto_type crypto_ablkcipher_type;
extern const struct crypto_type crypto_blkcipher_type;

void crypto_mod_put(struct crypto_alg *alg);

int crypto_register_template(struct crypto_template *tmpl);
void crypto_unregister_template(struct crypto_template *tmpl);
struct crypto_template *crypto_lookup_template(const char *name);

int crypto_register_instance(struct crypto_template *tmpl,
			     struct crypto_instance *inst);
int crypto_unregister_instance(struct crypto_instance *inst);

int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
		      struct crypto_instance *inst, u32 mask);
int crypto_init_spawn2(struct crypto_spawn *spawn, struct crypto_alg *alg,
		       struct crypto_instance *inst,
		       const struct crypto_type *frontend);
int crypto_grab_spawn(struct crypto_spawn *spawn, 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);

static inline void crypto_set_spawn(struct crypto_spawn *spawn,
				    struct crypto_instance *inst)
{
	spawn->inst = inst;
}

struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb);
int crypto_check_attr_type(struct rtattr **tb, u32 type);
const char *crypto_attr_alg_name(struct rtattr *rta);
struct crypto_alg *crypto_attr_alg2(struct rtattr *rta,
				    const struct crypto_type *frontend,
				    u32 type, u32 mask);

static inline struct crypto_alg *crypto_attr_alg(struct rtattr *rta,
						 u32 type, u32 mask)
{
	return crypto_attr_alg2(rta, NULL, type, mask);
}

int crypto_attr_u32(struct rtattr *rta, u32 *num);
void *crypto_alloc_instance2(const char *name, struct crypto_alg *alg,
			     unsigned int head);
struct crypto_instance *crypto_alloc_instance(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);
struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue);
int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm);
static inline unsigned int crypto_queue_len(struct crypto_queue *queue)
{
	return queue->qlen;
}

/* These functions require the input/output to be aligned as u32. */
void crypto_inc(u8 *a, unsigned int size);
void crypto_xor(u8 *dst, const u8 *src, unsigned int size);

int blkcipher_walk_done(struct blkcipher_desc *desc,
			struct blkcipher_walk *walk, int err);
int blkcipher_walk_virt(struct blkcipher_desc *desc,
			struct blkcipher_walk *walk);
int blkcipher_walk_phys(struct blkcipher_desc *desc,
			struct blkcipher_walk *walk);
int blkcipher_walk_virt_block(struct blkcipher_desc *desc,
			      struct blkcipher_walk *walk,
			      unsigned int blocksize);
int blkcipher_aead_walk_virt_block(struct blkcipher_desc *desc,
				   struct blkcipher_walk *walk,
				   struct crypto_aead *tfm,
				   unsigned int blocksize);

int ablkcipher_walk_done(struct ablkcipher_request *req,
			 struct ablkcipher_walk *walk, int err);
int ablkcipher_walk_phys(struct ablkcipher_request *req,
			 struct ablkcipher_walk *walk);
void __ablkcipher_walk_complete(struct ablkcipher_walk *walk);

static inline void *crypto_tfm_ctx_aligned(struct crypto_tfm *tfm)
{
	return PTR_ALIGN(crypto_tfm_ctx(tfm),
			 crypto_tfm_alg_alignmask(tfm) + 1);
}

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 ablkcipher_alg *crypto_ablkcipher_alg(
	struct crypto_ablkcipher *tfm)
{
	return &crypto_ablkcipher_tfm(tfm)->__crt_alg->cra_ablkcipher;
}

static inline void *crypto_ablkcipher_ctx(struct crypto_ablkcipher *tfm)
{
	return crypto_tfm_ctx(&tfm->base);
}

static inline void *crypto_ablkcipher_ctx_aligned(struct crypto_ablkcipher *tfm)
{
	return crypto_tfm_ctx_aligned(&tfm->base);
}

static inline struct crypto_blkcipher *crypto_spawn_blkcipher(
	struct crypto_spawn *spawn)
{
	u32 type = CRYPTO_ALG_TYPE_BLKCIPHER;
	u32 mask = CRYPTO_ALG_TYPE_MASK;

	return __crypto_blkcipher_cast(crypto_spawn_tfm(spawn, type, mask));
}

static inline void *crypto_blkcipher_ctx(struct crypto_blkcipher *tfm)
{
	return crypto_tfm_ctx(&tfm->base);
}

static inline void *crypto_blkcipher_ctx_aligned(struct crypto_blkcipher *tfm)
{
	return crypto_tfm_ctx_aligned(&tfm->base);
}

static inline struct crypto_cipher *crypto_spawn_cipher(
	struct crypto_spawn *spawn)
{
	u32 type = CRYPTO_ALG_TYPE_CIPHER;
	u32 mask = CRYPTO_ALG_TYPE_MASK;

	return __crypto_cipher_cast(crypto_spawn_tfm(spawn, type, mask));
}

static inline struct cipher_alg *crypto_cipher_alg(struct crypto_cipher *tfm)
{
	return &crypto_cipher_tfm(tfm)->__crt_alg->cra_cipher;
}

static inline void blkcipher_walk_init(struct blkcipher_walk *walk,
				       struct scatterlist *dst,
				       struct scatterlist *src,
				       unsigned int nbytes)
{
	walk->in.sg = src;
	walk->out.sg = dst;
	walk->total = nbytes;
}

static inline void ablkcipher_walk_init(struct ablkcipher_walk *walk,
					struct scatterlist *dst,
					struct scatterlist *src,
					unsigned int nbytes)
{
	walk->in.sg = src;
	walk->out.sg = dst;
	walk->total = nbytes;
	INIT_LIST_HEAD(&walk->buffers);
}

static inline void ablkcipher_walk_complete(struct ablkcipher_walk *walk)
{
	if (unlikely(!list_empty(&walk->buffers)))
		__ablkcipher_walk_complete(walk);
}

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 int ablkcipher_enqueue_request(struct crypto_queue *queue,
					     struct ablkcipher_request *request)
{
	return crypto_enqueue_request(queue, &request->base);
}

static inline struct ablkcipher_request *ablkcipher_dequeue_request(
	struct crypto_queue *queue)
{
	return ablkcipher_request_cast(crypto_dequeue_request(queue));
}

static inline void *ablkcipher_request_ctx(struct ablkcipher_request *req)
{
	return req->__ctx;
}

static inline int ablkcipher_tfm_in_queue(struct crypto_queue *queue,
					  struct crypto_ablkcipher *tfm)
{
	return crypto_tfm_in_queue(queue, crypto_ablkcipher_tfm(tfm));
}

static inline struct crypto_alg *crypto_get_attr_alg(struct rtattr **tb,
						     u32 type, u32 mask)
{
	return crypto_attr_alg(tb[1], type, mask);
}

/*
 * Returns CRYPTO_ALG_ASYNC if type/mask requires the use of sync algorithms.
 * Otherwise returns zero.
 */
static inline int crypto_requires_sync(u32 type, u32 mask)
{
	return (type ^ CRYPTO_ALG_ASYNC) & mask & CRYPTO_ALG_ASYNC;
}

noinline unsigned long __crypto_memneq(const void *a, const void *b, size_t size);

/**
 * crypto_memneq - Compare two areas of memory without leaking
 *		   timing information.
 *
 * @a: One area of memory
 * @b: Another area of memory
 * @size: The size of the area.
 *
 * Returns 0 when data is equal, 1 otherwise.
 */
static inline int crypto_memneq(const void *a, const void *b, size_t size)
{
	return __crypto_memneq(a, b, size) != 0UL ? 1 : 0;
}

static inline void crypto_yield(u32 flags)
{
	if (flags & CRYPTO_TFM_REQ_MAY_SLEEP)
		cond_resched();
}

#endif	/* _CRYPTO_ALGAPI_H */