aboutsummaryrefslogtreecommitdiff
path: root/block/blk-crypto-internal.h
blob: 8ac5597dc69c37ca061072bfdb6e6bf92cb9e88a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
/* 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 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 request_queue *q);

void blk_crypto_sysfs_unregister(struct request_queue *q);

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);

#else /* CONFIG_BLK_INLINE_ENCRYPTION */

static inline int blk_crypto_sysfs_register(struct request_queue *q)
{
	return 0;
}

static inline void blk_crypto_sysfs_unregister(struct request_queue *q) { }

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;
}

#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;
}

/**
 * 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_rq_get_keyslot(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 */