[linux-2.6-block.git] / block / blk-crypto-internal.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Copyright 2019 Google LLC
 */

#ifndef __LINUX_BLK_CRYPTO_INTERNAL_H
#define __LINUX_BLK_CRYPTO_INTERNAL_H

#include <linux/bio.h>
#include <linux/blk-mq.h>

/* Represents a crypto mode supported by blk-crypto  */
struct blk_crypto_mode {
	const char *name; /* name of this mode, shown in sysfs */
	const char *cipher_str; /* crypto API name (for fallback case) */
	unsigned int keysize; /* key size in bytes */
	unsigned int security_strength; /* security strength in bytes */
	unsigned int ivsize; /* iv size in bytes */
};

extern const struct blk_crypto_mode blk_crypto_modes[];

#ifdef CONFIG_BLK_INLINE_ENCRYPTION

int blk_crypto_sysfs_register(struct gendisk *disk);

void blk_crypto_sysfs_unregister(struct gendisk *disk);

void bio_crypt_dun_increment(u64 dun[BLK_CRYPTO_DUN_ARRAY_SIZE],
			     unsigned int inc);

bool bio_crypt_rq_ctx_compatible(struct request *rq, struct bio *bio);

bool bio_crypt_ctx_mergeable(struct bio_crypt_ctx *bc1, unsigned int bc1_bytes,
			     struct bio_crypt_ctx *bc2);

static inline bool bio_crypt_ctx_back_mergeable(struct request *req,
						struct bio *bio)
{
	return bio_crypt_ctx_mergeable(req->crypt_ctx, blk_rq_bytes(req),
				       bio->bi_crypt_context);
}

static inline bool bio_crypt_ctx_front_mergeable(struct request *req,
						 struct bio *bio)
{
	return bio_crypt_ctx_mergeable(bio->bi_crypt_context,
				       bio->bi_iter.bi_size, req->crypt_ctx);
}

static inline bool bio_crypt_ctx_merge_rq(struct request *req,
					  struct request *next)
{
	return bio_crypt_ctx_mergeable(req->crypt_ctx, blk_rq_bytes(req),
				       next->crypt_ctx);
}

static inline void blk_crypto_rq_set_defaults(struct request *rq)
{
	rq->crypt_ctx = NULL;
	rq->crypt_keyslot = NULL;
}

static inline bool blk_crypto_rq_is_encrypted(struct request *rq)
{
	return rq->crypt_ctx;
}

static inline bool blk_crypto_rq_has_keyslot(struct request *rq)
{
	return rq->crypt_keyslot;
}

blk_status_t blk_crypto_get_keyslot(struct blk_crypto_profile *profile,
				    const struct blk_crypto_key *key,
				    struct blk_crypto_keyslot **slot_ptr);

void blk_crypto_put_keyslot(struct blk_crypto_keyslot *slot);

int __blk_crypto_evict_key(struct blk_crypto_profile *profile,
			   const struct blk_crypto_key *key);

bool __blk_crypto_cfg_supported(struct blk_crypto_profile *profile,
				const struct blk_crypto_config *cfg);

int blk_crypto_ioctl(struct block_device *bdev, unsigned int cmd,
		     void __user *argp);

#else /* CONFIG_BLK_INLINE_ENCRYPTION */

static inline int blk_crypto_sysfs_register(struct gendisk *disk)
{
	return 0;
}

static inline void blk_crypto_sysfs_unregister(struct gendisk *disk)
{
}

static inline bool bio_crypt_rq_ctx_compatible(struct request *rq,
					       struct bio *bio)
{
	return true;
}

static inline bool bio_crypt_ctx_front_mergeable(struct request *req,
						 struct bio *bio)
{
	return true;
}

static inline bool bio_crypt_ctx_back_mergeable(struct request *req,
						struct bio *bio)
{
	return true;
}

static inline bool bio_crypt_ctx_merge_rq(struct request *req,
					  struct request *next)
{
	return true;
}

static inline void blk_crypto_rq_set_defaults(struct request *rq) { }

static inline bool blk_crypto_rq_is_encrypted(struct request *rq)
{
	return false;
}

static inline bool blk_crypto_rq_has_keyslot(struct request *rq)
{
	return false;
}

static inline int blk_crypto_ioctl(struct block_device *bdev, unsigned int cmd,
				   void __user *argp)
{
	return -ENOTTY;
}

#endif /* CONFIG_BLK_INLINE_ENCRYPTION */

void __bio_crypt_advance(struct bio *bio, unsigned int bytes);
static inline void bio_crypt_advance(struct bio *bio, unsigned int bytes)
{
	if (bio_has_crypt_ctx(bio))
		__bio_crypt_advance(bio, bytes);
}

void __bio_crypt_free_ctx(struct bio *bio);
static inline void bio_crypt_free_ctx(struct bio *bio)
{
	if (bio_has_crypt_ctx(bio))
		__bio_crypt_free_ctx(bio);
}

static inline void bio_crypt_do_front_merge(struct request *rq,
					    struct bio *bio)
{
#ifdef CONFIG_BLK_INLINE_ENCRYPTION
	if (bio_has_crypt_ctx(bio))
		memcpy(rq->crypt_ctx->bc_dun, bio->bi_crypt_context->bc_dun,
		       sizeof(rq->crypt_ctx->bc_dun));
#endif
}

bool __blk_crypto_bio_prep(struct bio **bio_ptr);
static inline bool blk_crypto_bio_prep(struct bio **bio_ptr)
{
	if (bio_has_crypt_ctx(*bio_ptr))
		return __blk_crypto_bio_prep(bio_ptr);
	return true;
}

blk_status_t __blk_crypto_rq_get_keyslot(struct request *rq);
static inline blk_status_t blk_crypto_rq_get_keyslot(struct request *rq)
{
	if (blk_crypto_rq_is_encrypted(rq))
		return __blk_crypto_rq_get_keyslot(rq);
	return BLK_STS_OK;
}

void __blk_crypto_rq_put_keyslot(struct request *rq);
static inline void blk_crypto_rq_put_keyslot(struct request *rq)
{
	if (blk_crypto_rq_has_keyslot(rq))
		__blk_crypto_rq_put_keyslot(rq);
}

void __blk_crypto_free_request(struct request *rq);
static inline void blk_crypto_free_request(struct request *rq)
{
	if (blk_crypto_rq_is_encrypted(rq))
		__blk_crypto_free_request(rq);
}

int __blk_crypto_rq_bio_prep(struct request *rq, struct bio *bio,
			     gfp_t gfp_mask);
/**
 * blk_crypto_rq_bio_prep - Prepare a request's crypt_ctx when its first bio
 *			    is inserted
 * @rq: The request to prepare
 * @bio: The first bio being inserted into the request
 * @gfp_mask: Memory allocation flags
 *
 * Return: 0 on success, -ENOMEM if out of memory.  -ENOMEM is only possible if
 *	   @gfp_mask doesn't include %__GFP_DIRECT_RECLAIM.
 */
static inline int blk_crypto_rq_bio_prep(struct request *rq, struct bio *bio,
					 gfp_t gfp_mask)
{
	if (bio_has_crypt_ctx(bio))
		return __blk_crypto_rq_bio_prep(rq, bio, gfp_mask);
	return 0;
}

#ifdef CONFIG_BLK_INLINE_ENCRYPTION_FALLBACK

int blk_crypto_fallback_start_using_mode(enum blk_crypto_mode_num mode_num);

bool blk_crypto_fallback_bio_prep(struct bio **bio_ptr);

int blk_crypto_fallback_evict_key(const struct blk_crypto_key *key);

#else /* CONFIG_BLK_INLINE_ENCRYPTION_FALLBACK */

static inline int
blk_crypto_fallback_start_using_mode(enum blk_crypto_mode_num mode_num)
{
	pr_warn_once("crypto API fallback is disabled\n");
	return -ENOPKG;
}

static inline bool blk_crypto_fallback_bio_prep(struct bio **bio_ptr)
{
	pr_warn_once("crypto API fallback disabled; failing request.\n");
	(*bio_ptr)->bi_status = BLK_STS_NOTSUPP;
	return false;
}

static inline int
blk_crypto_fallback_evict_key(const struct blk_crypto_key *key)
{
	return 0;
}

#endif /* CONFIG_BLK_INLINE_ENCRYPTION_FALLBACK */

#endif /* __LINUX_BLK_CRYPTO_INTERNAL_H */
Commit	Line	Data
	1	/* SPDX-License-Identifier: GPL-2.0 */
	2	/*
	3	* Copyright 2019 Google LLC
	4	*/
	5
	6	#ifndef __LINUX_BLK_CRYPTO_INTERNAL_H
	7	#define __LINUX_BLK_CRYPTO_INTERNAL_H
	8
	9	#include <linux/bio.h>
	10	#include <linux/blk-mq.h>
	11
	12	/* Represents a crypto mode supported by blk-crypto */
	13	struct blk_crypto_mode {
	14	const char name; / name of this mode, shown in sysfs */
	15	const char cipher_str; / crypto API name (for fallback case) */
	16	unsigned int keysize; /* key size in bytes */
	17	unsigned int security_strength; /* security strength in bytes */
	18	unsigned int ivsize; /* iv size in bytes */
	19	};
	20
	21	extern const struct blk_crypto_mode blk_crypto_modes[];
	22
	23	#ifdef CONFIG_BLK_INLINE_ENCRYPTION
	24
	25	int blk_crypto_sysfs_register(struct gendisk *disk);
	26
	27	void blk_crypto_sysfs_unregister(struct gendisk *disk);
	28
	29	void bio_crypt_dun_increment(u64 dun[BLK_CRYPTO_DUN_ARRAY_SIZE],
	30	unsigned int inc);
	31
	32	bool bio_crypt_rq_ctx_compatible(struct request rq, struct bio bio);
	33
	34	bool bio_crypt_ctx_mergeable(struct bio_crypt_ctx *bc1, unsigned int bc1_bytes,
	35	struct bio_crypt_ctx *bc2);
	36
	37	static inline bool bio_crypt_ctx_back_mergeable(struct request *req,
	38	struct bio *bio)
	39	{
	40	return bio_crypt_ctx_mergeable(req->crypt_ctx, blk_rq_bytes(req),
	41	bio->bi_crypt_context);
	42	}
	43
	44	static inline bool bio_crypt_ctx_front_mergeable(struct request *req,
	45	struct bio *bio)
	46	{
	47	return bio_crypt_ctx_mergeable(bio->bi_crypt_context,
	48	bio->bi_iter.bi_size, req->crypt_ctx);
	49	}
	50
	51	static inline bool bio_crypt_ctx_merge_rq(struct request *req,
	52	struct request *next)
	53	{
	54	return bio_crypt_ctx_mergeable(req->crypt_ctx, blk_rq_bytes(req),
	55	next->crypt_ctx);
	56	}
	57
	58	static inline void blk_crypto_rq_set_defaults(struct request *rq)
	59	{
	60	rq->crypt_ctx = NULL;
	61	rq->crypt_keyslot = NULL;
	62	}
	63
	64	static inline bool blk_crypto_rq_is_encrypted(struct request *rq)
	65	{
	66	return rq->crypt_ctx;
	67	}
	68
	69	static inline bool blk_crypto_rq_has_keyslot(struct request *rq)
	70	{
	71	return rq->crypt_keyslot;
	72	}
	73
	74	blk_status_t blk_crypto_get_keyslot(struct blk_crypto_profile *profile,
	75	const struct blk_crypto_key *key,
	76	struct blk_crypto_keyslot **slot_ptr);
	77
	78	void blk_crypto_put_keyslot(struct blk_crypto_keyslot *slot);
	79
	80	int __blk_crypto_evict_key(struct blk_crypto_profile *profile,
	81	const struct blk_crypto_key *key);
	82
	83	bool __blk_crypto_cfg_supported(struct blk_crypto_profile *profile,
	84	const struct blk_crypto_config *cfg);
	85
	86	int blk_crypto_ioctl(struct block_device *bdev, unsigned int cmd,
	87	void __user *argp);
	88
	89	#else /* CONFIG_BLK_INLINE_ENCRYPTION */
	90
	91	static inline int blk_crypto_sysfs_register(struct gendisk *disk)
	92	{
	93	return 0;
	94	}
	95
	96	static inline void blk_crypto_sysfs_unregister(struct gendisk *disk)
	97	{
	98	}
	99
	100	static inline bool bio_crypt_rq_ctx_compatible(struct request *rq,
	101	struct bio *bio)
	102	{
	103	return true;
	104	}
	105
	106	static inline bool bio_crypt_ctx_front_mergeable(struct request *req,
	107	struct bio *bio)
	108	{
	109	return true;
	110	}
	111
	112	static inline bool bio_crypt_ctx_back_mergeable(struct request *req,
	113	struct bio *bio)
	114	{
	115	return true;
	116	}
	117
	118	static inline bool bio_crypt_ctx_merge_rq(struct request *req,
	119	struct request *next)
	120	{
	121	return true;
	122	}
	123
	124	static inline void blk_crypto_rq_set_defaults(struct request *rq) { }
	125
	126	static inline bool blk_crypto_rq_is_encrypted(struct request *rq)
	127	{
	128	return false;
	129	}
	130
	131	static inline bool blk_crypto_rq_has_keyslot(struct request *rq)
	132	{
	133	return false;
	134	}
	135
	136	static inline int blk_crypto_ioctl(struct block_device *bdev, unsigned int cmd,
	137	void __user *argp)
	138	{
	139	return -ENOTTY;
	140	}
	141
	142	#endif /* CONFIG_BLK_INLINE_ENCRYPTION */
	143
	144	void __bio_crypt_advance(struct bio *bio, unsigned int bytes);
	145	static inline void bio_crypt_advance(struct bio *bio, unsigned int bytes)
	146	{
	147	if (bio_has_crypt_ctx(bio))
	148	__bio_crypt_advance(bio, bytes);
	149	}
	150
	151	void __bio_crypt_free_ctx(struct bio *bio);
	152	static inline void bio_crypt_free_ctx(struct bio *bio)
	153	{
	154	if (bio_has_crypt_ctx(bio))
	155	__bio_crypt_free_ctx(bio);
	156	}
	157
	158	static inline void bio_crypt_do_front_merge(struct request *rq,
	159	struct bio *bio)
	160	{
	161	#ifdef CONFIG_BLK_INLINE_ENCRYPTION
	162	if (bio_has_crypt_ctx(bio))
	163	memcpy(rq->crypt_ctx->bc_dun, bio->bi_crypt_context->bc_dun,
	164	sizeof(rq->crypt_ctx->bc_dun));
	165	#endif
	166	}
	167
	168	bool __blk_crypto_bio_prep(struct bio **bio_ptr);
	169	static inline bool blk_crypto_bio_prep(struct bio **bio_ptr)
	170	{
	171	if (bio_has_crypt_ctx(*bio_ptr))
	172	return __blk_crypto_bio_prep(bio_ptr);
	173	return true;
	174	}
	175
	176	blk_status_t __blk_crypto_rq_get_keyslot(struct request *rq);
	177	static inline blk_status_t blk_crypto_rq_get_keyslot(struct request *rq)
	178	{
	179	if (blk_crypto_rq_is_encrypted(rq))
	180	return __blk_crypto_rq_get_keyslot(rq);
	181	return BLK_STS_OK;
	182	}
	183
	184	void __blk_crypto_rq_put_keyslot(struct request *rq);
	185	static inline void blk_crypto_rq_put_keyslot(struct request *rq)
	186	{
	187	if (blk_crypto_rq_has_keyslot(rq))
	188	__blk_crypto_rq_put_keyslot(rq);
	189	}
	190
	191	void __blk_crypto_free_request(struct request *rq);
	192	static inline void blk_crypto_free_request(struct request *rq)
	193	{
	194	if (blk_crypto_rq_is_encrypted(rq))
	195	__blk_crypto_free_request(rq);
	196	}
	197
	198	int __blk_crypto_rq_bio_prep(struct request rq, struct bio bio,
	199	gfp_t gfp_mask);
	200	/**
	201	* blk_crypto_rq_bio_prep - Prepare a request's crypt_ctx when its first bio
	202	* is inserted
	203	* @rq: The request to prepare
	204	* @bio: The first bio being inserted into the request
	205	* @gfp_mask: Memory allocation flags
	206	*
	207	* Return: 0 on success, -ENOMEM if out of memory. -ENOMEM is only possible if
	208	* @gfp_mask doesn't include %__GFP_DIRECT_RECLAIM.
	209	*/
	210	static inline int blk_crypto_rq_bio_prep(struct request rq, struct bio bio,
	211	gfp_t gfp_mask)
	212	{
	213	if (bio_has_crypt_ctx(bio))
	214	return __blk_crypto_rq_bio_prep(rq, bio, gfp_mask);
	215	return 0;
	216	}
	217
	218	#ifdef CONFIG_BLK_INLINE_ENCRYPTION_FALLBACK
	219
	220	int blk_crypto_fallback_start_using_mode(enum blk_crypto_mode_num mode_num);
	221
	222	bool blk_crypto_fallback_bio_prep(struct bio **bio_ptr);
	223
	224	int blk_crypto_fallback_evict_key(const struct blk_crypto_key *key);
	225
	226	#else /* CONFIG_BLK_INLINE_ENCRYPTION_FALLBACK */
	227
	228	static inline int
	229	blk_crypto_fallback_start_using_mode(enum blk_crypto_mode_num mode_num)
	230	{
	231	pr_warn_once("crypto API fallback is disabled\n");
	232	return -ENOPKG;
	233	}
	234
	235	static inline bool blk_crypto_fallback_bio_prep(struct bio **bio_ptr)
	236	{
	237	pr_warn_once("crypto API fallback disabled; failing request.\n");
	238	(*bio_ptr)->bi_status = BLK_STS_NOTSUPP;
	239	return false;
	240	}
	241
	242	static inline int
	243	blk_crypto_fallback_evict_key(const struct blk_crypto_key *key)
	244	{
	245	return 0;
	246	}
	247
	248	#endif /* CONFIG_BLK_INLINE_ENCRYPTION_FALLBACK */
	249
	250	#endif /* __LINUX_BLK_CRYPTO_INTERNAL_H */