[linux-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/blkdev.h>

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

extern const struct blk_crypto_mode blk_crypto_modes[];

#ifdef CONFIG_BLK_INLINE_ENCRYPTION

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;
}

#else /* CONFIG_BLK_INLINE_ENCRYPTION */

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;
}

#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_init_request(struct request *rq);
static inline blk_status_t blk_crypto_init_request(struct request *rq)
{
	if (blk_crypto_rq_is_encrypted(rq))
		return __blk_crypto_init_request(rq);
	return BLK_STS_OK;
}

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);
}

void __blk_crypto_rq_bio_prep(struct request *rq, struct bio *bio,
			      gfp_t gfp_mask);
static inline void blk_crypto_rq_bio_prep(struct request *rq, struct bio *bio,
					  gfp_t gfp_mask)
{
	if (bio_has_crypt_ctx(bio))
		__blk_crypto_rq_bio_prep(rq, bio, gfp_mask);
}

/**
 * blk_crypto_insert_cloned_request - Prepare a cloned request to be inserted
 *				      into a request queue.
 * @rq: the request being queued
 *
 * Return: BLK_STS_OK on success, nonzero on error.
 */
static inline blk_status_t blk_crypto_insert_cloned_request(struct request *rq)
{

	if (blk_crypto_rq_is_encrypted(rq))
		return blk_crypto_init_request(rq);
	return BLK_STS_OK;
}

#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
a892c8d5 ST	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/blkdev.h>
	11
	12	/* Represents a crypto mode supported by blk-crypto */
	13	struct blk_crypto_mode {
488f6682	14	const char cipher_str; / crypto API name (for fallback case) */
a892c8d5 ST	15	unsigned int keysize; /* key size in bytes */
	16	unsigned int ivsize; /* iv size in bytes */
	17	};
	18
488f6682 ST	19	extern const struct blk_crypto_mode blk_crypto_modes[];
488f6682 ST	20
a892c8d5 ST	21	#ifdef CONFIG_BLK_INLINE_ENCRYPTION
	22
	23	void bio_crypt_dun_increment(u64 dun[BLK_CRYPTO_DUN_ARRAY_SIZE],
	24	unsigned int inc);
	25
	26	bool bio_crypt_rq_ctx_compatible(struct request rq, struct bio bio);
	27
	28	bool bio_crypt_ctx_mergeable(struct bio_crypt_ctx *bc1, unsigned int bc1_bytes,
	29	struct bio_crypt_ctx *bc2);
	30
	31	static inline bool bio_crypt_ctx_back_mergeable(struct request *req,
	32	struct bio *bio)
	33	{
	34	return bio_crypt_ctx_mergeable(req->crypt_ctx, blk_rq_bytes(req),
	35	bio->bi_crypt_context);
	36	}
	37
	38	static inline bool bio_crypt_ctx_front_mergeable(struct request *req,
	39	struct bio *bio)
	40	{
	41	return bio_crypt_ctx_mergeable(bio->bi_crypt_context,
	42	bio->bi_iter.bi_size, req->crypt_ctx);
	43	}
	44
	45	static inline bool bio_crypt_ctx_merge_rq(struct request *req,
	46	struct request *next)
	47	{
	48	return bio_crypt_ctx_mergeable(req->crypt_ctx, blk_rq_bytes(req),
	49	next->crypt_ctx);
	50	}
	51
	52	static inline void blk_crypto_rq_set_defaults(struct request *rq)
	53	{
	54	rq->crypt_ctx = NULL;
	55	rq->crypt_keyslot = NULL;
	56	}
	57
	58	static inline bool blk_crypto_rq_is_encrypted(struct request *rq)
	59	{
	60	return rq->crypt_ctx;
	61	}
	62
	63	#else /* CONFIG_BLK_INLINE_ENCRYPTION */
	64
	65	static inline bool bio_crypt_rq_ctx_compatible(struct request *rq,
	66	struct bio *bio)
	67	{
	68	return true;
	69	}
	70
	71	static inline bool bio_crypt_ctx_front_mergeable(struct request *req,
	72	struct bio *bio)
	73	{
	74	return true;
	75	}
	76
	77	static inline bool bio_crypt_ctx_back_mergeable(struct request *req,
	78	struct bio *bio)
	79	{
	80	return true;
	81	}
	82
	83	static inline bool bio_crypt_ctx_merge_rq(struct request *req,
	84	struct request *next)
85	{
86	return true;
87	}
88
89	static inline void blk_crypto_rq_set_defaults(struct request *rq) { }
90
91	static inline bool blk_crypto_rq_is_encrypted(struct request *rq)
92	{
93	return false;
94	}
95
96	#endif /* CONFIG_BLK_INLINE_ENCRYPTION */
97
98	void __bio_crypt_advance(struct bio *bio, unsigned int bytes);
99	static inline void bio_crypt_advance(struct bio *bio, unsigned int bytes)
100	{
101	if (bio_has_crypt_ctx(bio))
102	__bio_crypt_advance(bio, bytes);
103	}
104
105	void __bio_crypt_free_ctx(struct bio *bio);
106	static inline void bio_crypt_free_ctx(struct bio *bio)
107	{
108	if (bio_has_crypt_ctx(bio))
109	__bio_crypt_free_ctx(bio);
110	}
111
112	static inline void bio_crypt_do_front_merge(struct request *rq,
113	struct bio *bio)
114	{
115	#ifdef CONFIG_BLK_INLINE_ENCRYPTION
116	if (bio_has_crypt_ctx(bio))
117	memcpy(rq->crypt_ctx->bc_dun, bio->bi_crypt_context->bc_dun,
118	sizeof(rq->crypt_ctx->bc_dun));
119	#endif
120	}
121
122	bool __blk_crypto_bio_prep(struct bio **bio_ptr);
123	static inline bool blk_crypto_bio_prep(struct bio **bio_ptr)
124	{
125	if (bio_has_crypt_ctx(*bio_ptr))
126	return __blk_crypto_bio_prep(bio_ptr);
127	return true;
128	}
129
130	blk_status_t __blk_crypto_init_request(struct request *rq);
131	static inline blk_status_t blk_crypto_init_request(struct request *rq)
132	{
133	if (blk_crypto_rq_is_encrypted(rq))
134	return __blk_crypto_init_request(rq);
135	return BLK_STS_OK;
136	}
137
138	void __blk_crypto_free_request(struct request *rq);
139	static inline void blk_crypto_free_request(struct request *rq)
140	{
141	if (blk_crypto_rq_is_encrypted(rq))
142	__blk_crypto_free_request(rq);
143	}
144
145	void __blk_crypto_rq_bio_prep(struct request rq, struct bio bio,
146	gfp_t gfp_mask);
147	static inline void blk_crypto_rq_bio_prep(struct request rq, struct bio bio,
148	gfp_t gfp_mask)
149	{
150	if (bio_has_crypt_ctx(bio))
151	__blk_crypto_rq_bio_prep(rq, bio, gfp_mask);
152	}
153
154	/**
155	* blk_crypto_insert_cloned_request - Prepare a cloned request to be inserted
156	* into a request queue.
157	* @rq: the request being queued
158	*
159	* Return: BLK_STS_OK on success, nonzero on error.
160	*/
161	static inline blk_status_t blk_crypto_insert_cloned_request(struct request *rq)
162	{
163
164	if (blk_crypto_rq_is_encrypted(rq))
165	return blk_crypto_init_request(rq);
166	return BLK_STS_OK;
167	}
168
488f6682 ST	169	#ifdef CONFIG_BLK_INLINE_ENCRYPTION_FALLBACK
	170
	171	int blk_crypto_fallback_start_using_mode(enum blk_crypto_mode_num mode_num);
	172
	173	bool blk_crypto_fallback_bio_prep(struct bio **bio_ptr);
	174
	175	int blk_crypto_fallback_evict_key(const struct blk_crypto_key *key);
	176
	177	#else /* CONFIG_BLK_INLINE_ENCRYPTION_FALLBACK */
	178
	179	static inline int
	180	blk_crypto_fallback_start_using_mode(enum blk_crypto_mode_num mode_num)
	181	{
	182	pr_warn_once("crypto API fallback is disabled\n");
	183	return -ENOPKG;
	184	}
	185
	186	static inline bool blk_crypto_fallback_bio_prep(struct bio **bio_ptr)
	187	{
	188	pr_warn_once("crypto API fallback disabled; failing request.\n");
	189	(*bio_ptr)->bi_status = BLK_STS_NOTSUPP;
	190	return false;
	191	}
	192
	193	static inline int
	194	blk_crypto_fallback_evict_key(const struct blk_crypto_key *key)
	195	{
	196	return 0;
	197	}
	198
	199	#endif /* CONFIG_BLK_INLINE_ENCRYPTION_FALLBACK */
	200
a892c8d5	201	#endif /* __LINUX_BLK_CRYPTO_INTERNAL_H */