1 // SPDX-License-Identifier: GPL-2.0 1 // SPDX-License-Identifier: GPL-2.0
2 /* 2 /*
3 * Copyright 2019 Google LLC 3 * Copyright 2019 Google LLC
4 */ 4 */
5 5
6 /* 6 /*
7 * Refer to Documentation/block/inline-encrypt 7 * Refer to Documentation/block/inline-encryption.rst for detailed explanation.
8 */ 8 */
9 9
10 #define pr_fmt(fmt) "blk-crypto: " fmt 10 #define pr_fmt(fmt) "blk-crypto: " fmt
11 11
12 #include <linux/bio.h> 12 #include <linux/bio.h>
13 #include <linux/blkdev.h> 13 #include <linux/blkdev.h>
14 #include <linux/blk-crypto-profile.h> !! 14 #include <linux/keyslot-manager.h>
15 #include <linux/module.h> 15 #include <linux/module.h>
16 #include <linux/ratelimit.h> 16 #include <linux/ratelimit.h>
17 #include <linux/slab.h> 17 #include <linux/slab.h>
18 18
19 #include "blk-crypto-internal.h" 19 #include "blk-crypto-internal.h"
20 20
21 const struct blk_crypto_mode blk_crypto_modes[ 21 const struct blk_crypto_mode blk_crypto_modes[] = {
22 [BLK_ENCRYPTION_MODE_AES_256_XTS] = { 22 [BLK_ENCRYPTION_MODE_AES_256_XTS] = {
23 .name = "AES-256-XTS", <<
24 .cipher_str = "xts(aes)", 23 .cipher_str = "xts(aes)",
25 .keysize = 64, 24 .keysize = 64,
26 .ivsize = 16, 25 .ivsize = 16,
27 }, 26 },
28 [BLK_ENCRYPTION_MODE_AES_128_CBC_ESSIV 27 [BLK_ENCRYPTION_MODE_AES_128_CBC_ESSIV] = {
29 .name = "AES-128-CBC-ESSIV", <<
30 .cipher_str = "essiv(cbc(aes), 28 .cipher_str = "essiv(cbc(aes),sha256)",
31 .keysize = 16, 29 .keysize = 16,
32 .ivsize = 16, 30 .ivsize = 16,
33 }, 31 },
34 [BLK_ENCRYPTION_MODE_ADIANTUM] = { 32 [BLK_ENCRYPTION_MODE_ADIANTUM] = {
35 .name = "Adiantum", <<
36 .cipher_str = "adiantum(xchach 33 .cipher_str = "adiantum(xchacha12,aes)",
37 .keysize = 32, 34 .keysize = 32,
38 .ivsize = 32, 35 .ivsize = 32,
39 }, 36 },
40 [BLK_ENCRYPTION_MODE_SM4_XTS] = { <<
41 .name = "SM4-XTS", <<
42 .cipher_str = "xts(sm4)", <<
43 .keysize = 32, <<
44 .ivsize = 16, <<
45 }, <<
46 }; 37 };
47 38
48 /* 39 /*
49 * This number needs to be at least (the numbe 40 * This number needs to be at least (the number of threads doing IO
50 * concurrently) * (maximum recursive depth of 41 * concurrently) * (maximum recursive depth of a bio), so that we don't
51 * deadlock on crypt_ctx allocations. The defa 42 * deadlock on crypt_ctx allocations. The default is chosen to be the same
52 * as the default number of post read contexts 43 * as the default number of post read contexts in both EXT4 and F2FS.
53 */ 44 */
54 static int num_prealloc_crypt_ctxs = 128; 45 static int num_prealloc_crypt_ctxs = 128;
55 46
56 module_param(num_prealloc_crypt_ctxs, int, 044 47 module_param(num_prealloc_crypt_ctxs, int, 0444);
57 MODULE_PARM_DESC(num_prealloc_crypt_ctxs, 48 MODULE_PARM_DESC(num_prealloc_crypt_ctxs,
58 "Number of bio crypto contexts 49 "Number of bio crypto contexts to preallocate");
59 50
60 static struct kmem_cache *bio_crypt_ctx_cache; 51 static struct kmem_cache *bio_crypt_ctx_cache;
61 static mempool_t *bio_crypt_ctx_pool; 52 static mempool_t *bio_crypt_ctx_pool;
62 53
63 static int __init bio_crypt_ctx_init(void) 54 static int __init bio_crypt_ctx_init(void)
64 { 55 {
65 size_t i; 56 size_t i;
66 57
67 bio_crypt_ctx_cache = KMEM_CACHE(bio_c 58 bio_crypt_ctx_cache = KMEM_CACHE(bio_crypt_ctx, 0);
68 if (!bio_crypt_ctx_cache) 59 if (!bio_crypt_ctx_cache)
69 goto out_no_mem; 60 goto out_no_mem;
70 61
71 bio_crypt_ctx_pool = mempool_create_sl 62 bio_crypt_ctx_pool = mempool_create_slab_pool(num_prealloc_crypt_ctxs,
72 63 bio_crypt_ctx_cache);
73 if (!bio_crypt_ctx_pool) 64 if (!bio_crypt_ctx_pool)
74 goto out_no_mem; 65 goto out_no_mem;
75 66
76 /* This is assumed in various places. 67 /* This is assumed in various places. */
77 BUILD_BUG_ON(BLK_ENCRYPTION_MODE_INVAL 68 BUILD_BUG_ON(BLK_ENCRYPTION_MODE_INVALID != 0);
78 69
79 /* Sanity check that no algorithm exce 70 /* Sanity check that no algorithm exceeds the defined limits. */
80 for (i = 0; i < BLK_ENCRYPTION_MODE_MA 71 for (i = 0; i < BLK_ENCRYPTION_MODE_MAX; i++) {
81 BUG_ON(blk_crypto_modes[i].key 72 BUG_ON(blk_crypto_modes[i].keysize > BLK_CRYPTO_MAX_KEY_SIZE);
82 BUG_ON(blk_crypto_modes[i].ivs 73 BUG_ON(blk_crypto_modes[i].ivsize > BLK_CRYPTO_MAX_IV_SIZE);
83 } 74 }
84 75
85 return 0; 76 return 0;
86 out_no_mem: 77 out_no_mem:
87 panic("Failed to allocate mem for bio 78 panic("Failed to allocate mem for bio crypt ctxs\n");
88 } 79 }
89 subsys_initcall(bio_crypt_ctx_init); 80 subsys_initcall(bio_crypt_ctx_init);
90 81
91 void bio_crypt_set_ctx(struct bio *bio, const 82 void bio_crypt_set_ctx(struct bio *bio, const struct blk_crypto_key *key,
92 const u64 dun[BLK_CRYPT 83 const u64 dun[BLK_CRYPTO_DUN_ARRAY_SIZE], gfp_t gfp_mask)
93 { 84 {
94 struct bio_crypt_ctx *bc; 85 struct bio_crypt_ctx *bc;
95 86
96 /* 87 /*
97 * The caller must use a gfp_mask that 88 * The caller must use a gfp_mask that contains __GFP_DIRECT_RECLAIM so
98 * that the mempool_alloc() can't fail 89 * that the mempool_alloc() can't fail.
99 */ 90 */
100 WARN_ON_ONCE(!(gfp_mask & __GFP_DIRECT 91 WARN_ON_ONCE(!(gfp_mask & __GFP_DIRECT_RECLAIM));
101 92
102 bc = mempool_alloc(bio_crypt_ctx_pool, 93 bc = mempool_alloc(bio_crypt_ctx_pool, gfp_mask);
103 94
104 bc->bc_key = key; 95 bc->bc_key = key;
105 memcpy(bc->bc_dun, dun, sizeof(bc->bc_ 96 memcpy(bc->bc_dun, dun, sizeof(bc->bc_dun));
106 97
107 bio->bi_crypt_context = bc; 98 bio->bi_crypt_context = bc;
108 } 99 }
109 100
110 void __bio_crypt_free_ctx(struct bio *bio) 101 void __bio_crypt_free_ctx(struct bio *bio)
111 { 102 {
112 mempool_free(bio->bi_crypt_context, bi 103 mempool_free(bio->bi_crypt_context, bio_crypt_ctx_pool);
113 bio->bi_crypt_context = NULL; 104 bio->bi_crypt_context = NULL;
114 } 105 }
115 106
116 int __bio_crypt_clone(struct bio *dst, struct 107 int __bio_crypt_clone(struct bio *dst, struct bio *src, gfp_t gfp_mask)
117 { 108 {
118 dst->bi_crypt_context = mempool_alloc( 109 dst->bi_crypt_context = mempool_alloc(bio_crypt_ctx_pool, gfp_mask);
119 if (!dst->bi_crypt_context) 110 if (!dst->bi_crypt_context)
120 return -ENOMEM; 111 return -ENOMEM;
121 *dst->bi_crypt_context = *src->bi_cryp 112 *dst->bi_crypt_context = *src->bi_crypt_context;
122 return 0; 113 return 0;
123 } 114 }
>> 115 EXPORT_SYMBOL_GPL(__bio_crypt_clone);
124 116
125 /* Increments @dun by @inc, treating @dun as a 117 /* Increments @dun by @inc, treating @dun as a multi-limb integer. */
126 void bio_crypt_dun_increment(u64 dun[BLK_CRYPT 118 void bio_crypt_dun_increment(u64 dun[BLK_CRYPTO_DUN_ARRAY_SIZE],
127 unsigned int inc) 119 unsigned int inc)
128 { 120 {
129 int i; 121 int i;
130 122
131 for (i = 0; inc && i < BLK_CRYPTO_DUN_ 123 for (i = 0; inc && i < BLK_CRYPTO_DUN_ARRAY_SIZE; i++) {
132 dun[i] += inc; 124 dun[i] += inc;
133 /* 125 /*
134 * If the addition in this lim 126 * If the addition in this limb overflowed, then we need to
135 * carry 1 into the next limb. 127 * carry 1 into the next limb. Else the carry is 0.
136 */ 128 */
137 if (dun[i] < inc) 129 if (dun[i] < inc)
138 inc = 1; 130 inc = 1;
139 else 131 else
140 inc = 0; 132 inc = 0;
141 } 133 }
142 } 134 }
143 135
144 void __bio_crypt_advance(struct bio *bio, unsi 136 void __bio_crypt_advance(struct bio *bio, unsigned int bytes)
145 { 137 {
146 struct bio_crypt_ctx *bc = bio->bi_cry 138 struct bio_crypt_ctx *bc = bio->bi_crypt_context;
147 139
148 bio_crypt_dun_increment(bc->bc_dun, 140 bio_crypt_dun_increment(bc->bc_dun,
149 bytes >> bc->b 141 bytes >> bc->bc_key->data_unit_size_bits);
150 } 142 }
151 143
152 /* 144 /*
153 * Returns true if @bc->bc_dun plus @bytes con 145 * Returns true if @bc->bc_dun plus @bytes converted to data units is equal to
154 * @next_dun, treating the DUNs as multi-limb 146 * @next_dun, treating the DUNs as multi-limb integers.
155 */ 147 */
156 bool bio_crypt_dun_is_contiguous(const struct 148 bool bio_crypt_dun_is_contiguous(const struct bio_crypt_ctx *bc,
157 unsigned int 149 unsigned int bytes,
158 const u64 nex 150 const u64 next_dun[BLK_CRYPTO_DUN_ARRAY_SIZE])
159 { 151 {
160 int i; 152 int i;
161 unsigned int carry = bytes >> bc->bc_k 153 unsigned int carry = bytes >> bc->bc_key->data_unit_size_bits;
162 154
163 for (i = 0; i < BLK_CRYPTO_DUN_ARRAY_S 155 for (i = 0; i < BLK_CRYPTO_DUN_ARRAY_SIZE; i++) {
164 if (bc->bc_dun[i] + carry != n 156 if (bc->bc_dun[i] + carry != next_dun[i])
165 return false; 157 return false;
166 /* 158 /*
167 * If the addition in this lim 159 * If the addition in this limb overflowed, then we need to
168 * carry 1 into the next limb. 160 * carry 1 into the next limb. Else the carry is 0.
169 */ 161 */
170 if ((bc->bc_dun[i] + carry) < 162 if ((bc->bc_dun[i] + carry) < carry)
171 carry = 1; 163 carry = 1;
172 else 164 else
173 carry = 0; 165 carry = 0;
174 } 166 }
175 167
176 /* If the DUN wrapped through 0, don't 168 /* If the DUN wrapped through 0, don't treat it as contiguous. */
177 return carry == 0; 169 return carry == 0;
178 } 170 }
179 171
180 /* 172 /*
181 * Checks that two bio crypt contexts are comp 173 * Checks that two bio crypt contexts are compatible - i.e. that
182 * they are mergeable except for data_unit_num 174 * they are mergeable except for data_unit_num continuity.
183 */ 175 */
184 static bool bio_crypt_ctx_compatible(struct bi 176 static bool bio_crypt_ctx_compatible(struct bio_crypt_ctx *bc1,
185 struct bi 177 struct bio_crypt_ctx *bc2)
186 { 178 {
187 if (!bc1) 179 if (!bc1)
188 return !bc2; 180 return !bc2;
189 181
190 return bc2 && bc1->bc_key == bc2->bc_k 182 return bc2 && bc1->bc_key == bc2->bc_key;
191 } 183 }
192 184
193 bool bio_crypt_rq_ctx_compatible(struct reques 185 bool bio_crypt_rq_ctx_compatible(struct request *rq, struct bio *bio)
194 { 186 {
195 return bio_crypt_ctx_compatible(rq->cr 187 return bio_crypt_ctx_compatible(rq->crypt_ctx, bio->bi_crypt_context);
196 } 188 }
197 189
198 /* 190 /*
199 * Checks that two bio crypt contexts are comp 191 * Checks that two bio crypt contexts are compatible, and also
200 * that their data_unit_nums are continuous (a 192 * that their data_unit_nums are continuous (and can hence be merged)
201 * in the order @bc1 followed by @bc2. 193 * in the order @bc1 followed by @bc2.
202 */ 194 */
203 bool bio_crypt_ctx_mergeable(struct bio_crypt_ 195 bool bio_crypt_ctx_mergeable(struct bio_crypt_ctx *bc1, unsigned int bc1_bytes,
204 struct bio_crypt_ 196 struct bio_crypt_ctx *bc2)
205 { 197 {
206 if (!bio_crypt_ctx_compatible(bc1, bc2 198 if (!bio_crypt_ctx_compatible(bc1, bc2))
207 return false; 199 return false;
208 200
209 return !bc1 || bio_crypt_dun_is_contig 201 return !bc1 || bio_crypt_dun_is_contiguous(bc1, bc1_bytes, bc2->bc_dun);
210 } 202 }
211 203
212 /* Check that all I/O segments are data unit a 204 /* Check that all I/O segments are data unit aligned. */
213 static bool bio_crypt_check_alignment(struct b 205 static bool bio_crypt_check_alignment(struct bio *bio)
214 { 206 {
215 const unsigned int data_unit_size = 207 const unsigned int data_unit_size =
216 bio->bi_crypt_context->bc_key- 208 bio->bi_crypt_context->bc_key->crypto_cfg.data_unit_size;
217 struct bvec_iter iter; 209 struct bvec_iter iter;
218 struct bio_vec bv; 210 struct bio_vec bv;
219 211
220 bio_for_each_segment(bv, bio, iter) { 212 bio_for_each_segment(bv, bio, iter) {
221 if (!IS_ALIGNED(bv.bv_len | bv 213 if (!IS_ALIGNED(bv.bv_len | bv.bv_offset, data_unit_size))
222 return false; 214 return false;
223 } 215 }
224 216
225 return true; 217 return true;
226 } 218 }
227 219
228 blk_status_t __blk_crypto_rq_get_keyslot(struc 220 blk_status_t __blk_crypto_rq_get_keyslot(struct request *rq)
229 { 221 {
230 return blk_crypto_get_keyslot(rq->q->c !! 222 return blk_ksm_get_slot_for_key(rq->q->ksm, rq->crypt_ctx->bc_key,
231 rq->cryp !! 223 &rq->crypt_keyslot);
232 &rq->cry <<
233 } 224 }
234 225
235 void __blk_crypto_rq_put_keyslot(struct reques 226 void __blk_crypto_rq_put_keyslot(struct request *rq)
236 { 227 {
237 blk_crypto_put_keyslot(rq->crypt_keysl !! 228 blk_ksm_put_slot(rq->crypt_keyslot);
238 rq->crypt_keyslot = NULL; 229 rq->crypt_keyslot = NULL;
239 } 230 }
240 231
241 void __blk_crypto_free_request(struct request 232 void __blk_crypto_free_request(struct request *rq)
242 { 233 {
243 /* The keyslot, if one was needed, sho 234 /* The keyslot, if one was needed, should have been released earlier. */
244 if (WARN_ON_ONCE(rq->crypt_keyslot)) 235 if (WARN_ON_ONCE(rq->crypt_keyslot))
245 __blk_crypto_rq_put_keyslot(rq 236 __blk_crypto_rq_put_keyslot(rq);
246 237
247 mempool_free(rq->crypt_ctx, bio_crypt_ 238 mempool_free(rq->crypt_ctx, bio_crypt_ctx_pool);
248 rq->crypt_ctx = NULL; 239 rq->crypt_ctx = NULL;
249 } 240 }
250 241
251 /** 242 /**
252 * __blk_crypto_bio_prep - Prepare bio for inl 243 * __blk_crypto_bio_prep - Prepare bio for inline encryption
253 * 244 *
254 * @bio_ptr: pointer to original bio pointer 245 * @bio_ptr: pointer to original bio pointer
255 * 246 *
256 * If the bio crypt context provided for the b 247 * If the bio crypt context provided for the bio is supported by the underlying
257 * device's inline encryption hardware, do not 248 * device's inline encryption hardware, do nothing.
258 * 249 *
259 * Otherwise, try to perform en/decryption for 250 * Otherwise, try to perform en/decryption for this bio by falling back to the
260 * kernel crypto API. When the crypto API fall 251 * kernel crypto API. When the crypto API fallback is used for encryption,
261 * blk-crypto may choose to split the bio into 252 * blk-crypto may choose to split the bio into 2 - the first one that will
262 * continue to be processed and the second one 253 * continue to be processed and the second one that will be resubmitted via
263 * submit_bio_noacct. A bounce bio will be all 254 * submit_bio_noacct. A bounce bio will be allocated to encrypt the contents
264 * of the aforementioned "first one", and *bio 255 * of the aforementioned "first one", and *bio_ptr will be updated to this
265 * bounce bio. 256 * bounce bio.
266 * 257 *
267 * Caller must ensure bio has bio_crypt_ctx. 258 * Caller must ensure bio has bio_crypt_ctx.
268 * 259 *
269 * Return: true on success; false on error (an 260 * Return: true on success; false on error (and bio->bi_status will be set
270 * appropriately, and bio_endio() will 261 * appropriately, and bio_endio() will have been called so bio
271 * submission should abort). 262 * submission should abort).
272 */ 263 */
273 bool __blk_crypto_bio_prep(struct bio **bio_pt 264 bool __blk_crypto_bio_prep(struct bio **bio_ptr)
274 { 265 {
275 struct bio *bio = *bio_ptr; 266 struct bio *bio = *bio_ptr;
276 const struct blk_crypto_key *bc_key = 267 const struct blk_crypto_key *bc_key = bio->bi_crypt_context->bc_key;
277 268
278 /* Error if bio has no data. */ 269 /* Error if bio has no data. */
279 if (WARN_ON_ONCE(!bio_has_data(bio))) 270 if (WARN_ON_ONCE(!bio_has_data(bio))) {
280 bio->bi_status = BLK_STS_IOERR 271 bio->bi_status = BLK_STS_IOERR;
281 goto fail; 272 goto fail;
282 } 273 }
283 274
284 if (!bio_crypt_check_alignment(bio)) { 275 if (!bio_crypt_check_alignment(bio)) {
285 bio->bi_status = BLK_STS_IOERR 276 bio->bi_status = BLK_STS_IOERR;
286 goto fail; 277 goto fail;
287 } 278 }
288 279
289 /* 280 /*
290 * Success if device supports the encr 281 * Success if device supports the encryption context, or if we succeeded
291 * in falling back to the crypto API. 282 * in falling back to the crypto API.
292 */ 283 */
293 if (blk_crypto_config_supported_native !! 284 if (blk_ksm_crypto_cfg_supported(bio->bi_bdev->bd_disk->queue->ksm,
294 !! 285 &bc_key->crypto_cfg))
295 return true; 286 return true;
>> 287
296 if (blk_crypto_fallback_bio_prep(bio_p 288 if (blk_crypto_fallback_bio_prep(bio_ptr))
297 return true; 289 return true;
298 fail: 290 fail:
299 bio_endio(*bio_ptr); 291 bio_endio(*bio_ptr);
300 return false; 292 return false;
301 } 293 }
302 294
303 int __blk_crypto_rq_bio_prep(struct request *r 295 int __blk_crypto_rq_bio_prep(struct request *rq, struct bio *bio,
304 gfp_t gfp_mask) 296 gfp_t gfp_mask)
305 { 297 {
306 if (!rq->crypt_ctx) { 298 if (!rq->crypt_ctx) {
307 rq->crypt_ctx = mempool_alloc( 299 rq->crypt_ctx = mempool_alloc(bio_crypt_ctx_pool, gfp_mask);
308 if (!rq->crypt_ctx) 300 if (!rq->crypt_ctx)
309 return -ENOMEM; 301 return -ENOMEM;
310 } 302 }
311 *rq->crypt_ctx = *bio->bi_crypt_contex 303 *rq->crypt_ctx = *bio->bi_crypt_context;
312 return 0; 304 return 0;
313 } 305 }
314 306
315 /** 307 /**
316 * blk_crypto_init_key() - Prepare a key for u 308 * blk_crypto_init_key() - Prepare a key for use with blk-crypto
317 * @blk_key: Pointer to the blk_crypto_key to 309 * @blk_key: Pointer to the blk_crypto_key to initialize.
318 * @raw_key: Pointer to the raw key. Must be t 310 * @raw_key: Pointer to the raw key. Must be the correct length for the chosen
319 * @crypto_mode; see blk_crypto_mode 311 * @crypto_mode; see blk_crypto_modes[].
320 * @crypto_mode: identifier for the encryption 312 * @crypto_mode: identifier for the encryption algorithm to use
321 * @dun_bytes: number of bytes that will be us 313 * @dun_bytes: number of bytes that will be used to specify the DUN when this
322 * key is used 314 * key is used
323 * @data_unit_size: the data unit size to use 315 * @data_unit_size: the data unit size to use for en/decryption
324 * 316 *
325 * Return: 0 on success, -errno on failure. T 317 * Return: 0 on success, -errno on failure. The caller is responsible for
326 * zeroizing both blk_key and raw_key 318 * zeroizing both blk_key and raw_key when done with them.
327 */ 319 */
328 int blk_crypto_init_key(struct blk_crypto_key 320 int blk_crypto_init_key(struct blk_crypto_key *blk_key, const u8 *raw_key,
329 enum blk_crypto_mode_n 321 enum blk_crypto_mode_num crypto_mode,
330 unsigned int dun_bytes 322 unsigned int dun_bytes,
331 unsigned int data_unit 323 unsigned int data_unit_size)
332 { 324 {
333 const struct blk_crypto_mode *mode; 325 const struct blk_crypto_mode *mode;
334 326
335 memset(blk_key, 0, sizeof(*blk_key)); 327 memset(blk_key, 0, sizeof(*blk_key));
336 328
337 if (crypto_mode >= ARRAY_SIZE(blk_cryp 329 if (crypto_mode >= ARRAY_SIZE(blk_crypto_modes))
338 return -EINVAL; 330 return -EINVAL;
339 331
340 mode = &blk_crypto_modes[crypto_mode]; 332 mode = &blk_crypto_modes[crypto_mode];
341 if (mode->keysize == 0) 333 if (mode->keysize == 0)
342 return -EINVAL; 334 return -EINVAL;
343 335
344 if (dun_bytes == 0 || dun_bytes > mode 336 if (dun_bytes == 0 || dun_bytes > mode->ivsize)
345 return -EINVAL; 337 return -EINVAL;
346 338
347 if (!is_power_of_2(data_unit_size)) 339 if (!is_power_of_2(data_unit_size))
348 return -EINVAL; 340 return -EINVAL;
349 341
350 blk_key->crypto_cfg.crypto_mode = cryp 342 blk_key->crypto_cfg.crypto_mode = crypto_mode;
351 blk_key->crypto_cfg.dun_bytes = dun_by 343 blk_key->crypto_cfg.dun_bytes = dun_bytes;
352 blk_key->crypto_cfg.data_unit_size = d 344 blk_key->crypto_cfg.data_unit_size = data_unit_size;
353 blk_key->data_unit_size_bits = ilog2(d 345 blk_key->data_unit_size_bits = ilog2(data_unit_size);
354 blk_key->size = mode->keysize; 346 blk_key->size = mode->keysize;
355 memcpy(blk_key->raw, raw_key, mode->ke 347 memcpy(blk_key->raw, raw_key, mode->keysize);
356 348
357 return 0; 349 return 0;
358 } 350 }
359 351
360 bool blk_crypto_config_supported_natively(stru <<
361 cons <<
362 { <<
363 return __blk_crypto_cfg_supported(bdev <<
364 cfg) <<
365 } <<
366 <<
367 /* 352 /*
368 * Check if bios with @cfg can be en/decrypted 353 * Check if bios with @cfg can be en/decrypted by blk-crypto (i.e. either the
369 * block_device it's submitted to supports inl !! 354 * request queue it's submitted to supports inline crypto, or the
370 * blk-crypto-fallback is enabled and supports 355 * blk-crypto-fallback is enabled and supports the cfg).
371 */ 356 */
372 bool blk_crypto_config_supported(struct block_ !! 357 bool blk_crypto_config_supported(struct request_queue *q,
373 const struct 358 const struct blk_crypto_config *cfg)
374 { 359 {
375 return IS_ENABLED(CONFIG_BLK_INLINE_EN 360 return IS_ENABLED(CONFIG_BLK_INLINE_ENCRYPTION_FALLBACK) ||
376 blk_crypto_config_supported_nat !! 361 blk_ksm_crypto_cfg_supported(q->ksm, cfg);
377 } 362 }
378 363
379 /** 364 /**
380 * blk_crypto_start_using_key() - Start using 365 * blk_crypto_start_using_key() - Start using a blk_crypto_key on a device
381 * @bdev: block device to operate on <<
382 * @key: A key to use on the device 366 * @key: A key to use on the device
>> 367 * @q: the request queue for the device
383 * 368 *
384 * Upper layers must call this function to ens 369 * Upper layers must call this function to ensure that either the hardware
385 * supports the key's crypto settings, or the 370 * supports the key's crypto settings, or the crypto API fallback has transforms
386 * for the needed mode allocated and ready to 371 * for the needed mode allocated and ready to go. This function may allocate
387 * an skcipher, and *should not* be called fro 372 * an skcipher, and *should not* be called from the data path, since that might
388 * cause a deadlock 373 * cause a deadlock
389 * 374 *
390 * Return: 0 on success; -ENOPKG if the hardwa 375 * Return: 0 on success; -ENOPKG if the hardware doesn't support the key and
391 * blk-crypto-fallback is either disab 376 * blk-crypto-fallback is either disabled or the needed algorithm
392 * is disabled in the crypto API; or a 377 * is disabled in the crypto API; or another -errno code.
393 */ 378 */
394 int blk_crypto_start_using_key(struct block_de !! 379 int blk_crypto_start_using_key(const struct blk_crypto_key *key,
395 const struct bl !! 380 struct request_queue *q)
396 { 381 {
397 if (blk_crypto_config_supported_native !! 382 if (blk_ksm_crypto_cfg_supported(q->ksm, &key->crypto_cfg))
398 return 0; 383 return 0;
399 return blk_crypto_fallback_start_using 384 return blk_crypto_fallback_start_using_mode(key->crypto_cfg.crypto_mode);
400 } 385 }
401 386
402 /** 387 /**
403 * blk_crypto_evict_key() - Evict a blk_crypto !! 388 * blk_crypto_evict_key() - Evict a blk_crypto_key from a request_queue
404 * @bdev: a block_device on which I/O using th !! 389 * @q: a request_queue on which I/O using the key may have been done
405 * @key: the key to evict 390 * @key: the key to evict
406 * 391 *
407 * For a given block_device, this function rem !! 392 * For a given request_queue, this function removes the given blk_crypto_key
408 * the keyslot management structures and evict !! 393 * from the keyslot management structures and evicts it from any underlying
409 * keyslot(s) or blk-crypto-fallback keyslot i !! 394 * hardware keyslot(s) or blk-crypto-fallback keyslot it may have been
>> 395 * programmed into.
410 * 396 *
411 * Upper layers must call this before freeing 397 * Upper layers must call this before freeing the blk_crypto_key. It must be
412 * called for every block_device the key may h !! 398 * called for every request_queue the key may have been used on. The key must
413 * longer be in use by any I/O when this funct !! 399 * no longer be in use by any I/O when this function is called.
414 * 400 *
415 * Context: May sleep. 401 * Context: May sleep.
416 */ 402 */
417 void blk_crypto_evict_key(struct block_device !! 403 void blk_crypto_evict_key(struct request_queue *q,
418 const struct blk_cry 404 const struct blk_crypto_key *key)
419 { 405 {
420 struct request_queue *q = bdev_get_que <<
421 int err; 406 int err;
422 407
423 if (blk_crypto_config_supported_native !! 408 if (blk_ksm_crypto_cfg_supported(q->ksm, &key->crypto_cfg))
424 err = __blk_crypto_evict_key(q !! 409 err = blk_ksm_evict_key(q->ksm, key);
425 else 410 else
426 err = blk_crypto_fallback_evic 411 err = blk_crypto_fallback_evict_key(key);
427 /* 412 /*
428 * An error can only occur here if the 413 * An error can only occur here if the key failed to be evicted from a
429 * keyslot (due to a hardware or drive 414 * keyslot (due to a hardware or driver issue) or is allegedly still in
430 * use by I/O (due to a kernel bug). 415 * use by I/O (due to a kernel bug). Even in these cases, the key is
431 * still unlinked from the keyslot man 416 * still unlinked from the keyslot management structures, and the caller
432 * is allowed and expected to free it 417 * is allowed and expected to free it right away. There's nothing
433 * callers can do to handle errors, so 418 * callers can do to handle errors, so just log them and return void.
434 */ 419 */
435 if (err) 420 if (err)
436 pr_warn_ratelimited("%pg: erro !! 421 pr_warn_ratelimited("error %d evicting key\n", err);
437 } 422 }
438 EXPORT_SYMBOL_GPL(blk_crypto_evict_key); 423 EXPORT_SYMBOL_GPL(blk_crypto_evict_key);
439 424
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