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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[]; |
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 | ||
93f221ae EB |
145 | int __blk_crypto_rq_bio_prep(struct request *rq, struct bio *bio, |
146 | gfp_t gfp_mask); | |
147 | /** | |
148 | * blk_crypto_rq_bio_prep - Prepare a request's crypt_ctx when its first bio | |
149 | * is inserted | |
150 | * @rq: The request to prepare | |
151 | * @bio: The first bio being inserted into the request | |
152 | * @gfp_mask: Memory allocation flags | |
153 | * | |
154 | * Return: 0 on success, -ENOMEM if out of memory. -ENOMEM is only possible if | |
155 | * @gfp_mask doesn't include %__GFP_DIRECT_RECLAIM. | |
156 | */ | |
157 | static inline int blk_crypto_rq_bio_prep(struct request *rq, struct bio *bio, | |
158 | gfp_t gfp_mask) | |
a892c8d5 ST |
159 | { |
160 | if (bio_has_crypt_ctx(bio)) | |
93f221ae EB |
161 | return __blk_crypto_rq_bio_prep(rq, bio, gfp_mask); |
162 | return 0; | |
a892c8d5 ST |
163 | } |
164 | ||
165 | /** | |
166 | * blk_crypto_insert_cloned_request - Prepare a cloned request to be inserted | |
167 | * into a request queue. | |
168 | * @rq: the request being queued | |
169 | * | |
170 | * Return: BLK_STS_OK on success, nonzero on error. | |
171 | */ | |
172 | static inline blk_status_t blk_crypto_insert_cloned_request(struct request *rq) | |
173 | { | |
174 | ||
175 | if (blk_crypto_rq_is_encrypted(rq)) | |
176 | return blk_crypto_init_request(rq); | |
177 | return BLK_STS_OK; | |
178 | } | |
179 | ||
488f6682 ST |
180 | #ifdef CONFIG_BLK_INLINE_ENCRYPTION_FALLBACK |
181 | ||
182 | int blk_crypto_fallback_start_using_mode(enum blk_crypto_mode_num mode_num); | |
183 | ||
184 | bool blk_crypto_fallback_bio_prep(struct bio **bio_ptr); | |
185 | ||
186 | int blk_crypto_fallback_evict_key(const struct blk_crypto_key *key); | |
187 | ||
188 | #else /* CONFIG_BLK_INLINE_ENCRYPTION_FALLBACK */ | |
189 | ||
190 | static inline int | |
191 | blk_crypto_fallback_start_using_mode(enum blk_crypto_mode_num mode_num) | |
192 | { | |
193 | pr_warn_once("crypto API fallback is disabled\n"); | |
194 | return -ENOPKG; | |
195 | } | |
196 | ||
197 | static inline bool blk_crypto_fallback_bio_prep(struct bio **bio_ptr) | |
198 | { | |
199 | pr_warn_once("crypto API fallback disabled; failing request.\n"); | |
200 | (*bio_ptr)->bi_status = BLK_STS_NOTSUPP; | |
201 | return false; | |
202 | } | |
203 | ||
204 | static inline int | |
205 | blk_crypto_fallback_evict_key(const struct blk_crypto_key *key) | |
206 | { | |
207 | return 0; | |
208 | } | |
209 | ||
210 | #endif /* CONFIG_BLK_INLINE_ENCRYPTION_FALLBACK */ | |
211 | ||
a892c8d5 | 212 | #endif /* __LINUX_BLK_CRYPTO_INTERNAL_H */ |