| 1 | /* |
| 2 | * An OCF module that uses the linux kernel cryptoapi, based on the |
| 3 | * original cryptosoft for BSD by Angelos D. Keromytis (angelos@cis.upenn.edu) |
| 4 | * but is mostly unrecognisable, |
| 5 | * |
| 6 | * Written by David McCullough <david_mccullough@mcafee.com> |
| 7 | * Copyright (C) 2004-2011 David McCullough |
| 8 | * Copyright (C) 2004-2005 Intel Corporation. |
| 9 | * |
| 10 | * LICENSE TERMS |
| 11 | * |
| 12 | * The free distribution and use of this software in both source and binary |
| 13 | * form is allowed (with or without changes) provided that: |
| 14 | * |
| 15 | * 1. distributions of this source code include the above copyright |
| 16 | * notice, this list of conditions and the following disclaimer; |
| 17 | * |
| 18 | * 2. distributions in binary form include the above copyright |
| 19 | * notice, this list of conditions and the following disclaimer |
| 20 | * in the documentation and/or other associated materials; |
| 21 | * |
| 22 | * 3. the copyright holder's name is not used to endorse products |
| 23 | * built using this software without specific written permission. |
| 24 | * |
| 25 | * ALTERNATIVELY, provided that this notice is retained in full, this product |
| 26 | * may be distributed under the terms of the GNU General Public License (GPL), |
| 27 | * in which case the provisions of the GPL apply INSTEAD OF those given above. |
| 28 | * |
| 29 | * DISCLAIMER |
| 30 | * |
| 31 | * This software is provided 'as is' with no explicit or implied warranties |
| 32 | * in respect of its properties, including, but not limited to, correctness |
| 33 | * and/or fitness for purpose. |
| 34 | * --------------------------------------------------------------------------- |
| 35 | */ |
| 36 | |
| 37 | #include <linux/version.h> |
| 38 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,38) && !defined(AUTOCONF_INCLUDED) |
| 39 | #include <linux/config.h> |
| 40 | #endif |
| 41 | #include <linux/module.h> |
| 42 | #include <linux/init.h> |
| 43 | #include <linux/list.h> |
| 44 | #include <linux/slab.h> |
| 45 | #include <linux/sched.h> |
| 46 | #include <linux/wait.h> |
| 47 | #include <linux/crypto.h> |
| 48 | #include <linux/mm.h> |
| 49 | #include <linux/skbuff.h> |
| 50 | #include <linux/random.h> |
| 51 | #include <linux/interrupt.h> |
| 52 | #include <linux/spinlock.h> |
| 53 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,10) |
| 54 | #include <linux/scatterlist.h> |
| 55 | #endif |
| 56 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,29) |
| 57 | #include <crypto/hash.h> |
| 58 | #endif |
| 59 | |
| 60 | #include <cryptodev.h> |
| 61 | #include <uio.h> |
| 62 | |
| 63 | struct { |
| 64 | softc_device_decl sc_dev; |
| 65 | } swcr_softc; |
| 66 | |
| 67 | #define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK) |
| 68 | |
| 69 | #define SW_TYPE_CIPHER 0x01 |
| 70 | #define SW_TYPE_HMAC 0x02 |
| 71 | #define SW_TYPE_HASH 0x04 |
| 72 | #define SW_TYPE_COMP 0x08 |
| 73 | #define SW_TYPE_BLKCIPHER 0x10 |
| 74 | #define SW_TYPE_ALG_MASK 0x1f |
| 75 | |
| 76 | #define SW_TYPE_ASYNC 0x8000 |
| 77 | |
| 78 | #define SW_TYPE_INUSE 0x10000000 |
| 79 | |
| 80 | /* We change some of the above if we have an async interface */ |
| 81 | |
| 82 | #define SW_TYPE_ALG_AMASK (SW_TYPE_ALG_MASK | SW_TYPE_ASYNC) |
| 83 | |
| 84 | #define SW_TYPE_ABLKCIPHER (SW_TYPE_BLKCIPHER | SW_TYPE_ASYNC) |
| 85 | #define SW_TYPE_AHASH (SW_TYPE_HASH | SW_TYPE_ASYNC) |
| 86 | #define SW_TYPE_AHMAC (SW_TYPE_HMAC | SW_TYPE_ASYNC) |
| 87 | |
| 88 | #define SCATTERLIST_MAX 16 |
| 89 | |
| 90 | struct swcr_data { |
| 91 | struct work_struct workq; |
| 92 | int sw_type; |
| 93 | int sw_alg; |
| 94 | struct crypto_tfm *sw_tfm; |
| 95 | spinlock_t sw_tfm_lock; |
| 96 | union { |
| 97 | struct { |
| 98 | char *sw_key; |
| 99 | int sw_klen; |
| 100 | int sw_mlen; |
| 101 | } hmac; |
| 102 | void *sw_comp_buf; |
| 103 | } u; |
| 104 | struct swcr_data *sw_next; |
| 105 | }; |
| 106 | |
| 107 | struct swcr_req { |
| 108 | struct swcr_data *sw_head; |
| 109 | struct swcr_data *sw; |
| 110 | struct cryptop *crp; |
| 111 | struct cryptodesc *crd; |
| 112 | struct scatterlist sg[SCATTERLIST_MAX]; |
| 113 | unsigned char iv[EALG_MAX_BLOCK_LEN]; |
| 114 | char result[HASH_MAX_LEN]; |
| 115 | void *crypto_req; |
| 116 | }; |
| 117 | |
| 118 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,20) |
| 119 | static kmem_cache_t *swcr_req_cache; |
| 120 | #else |
| 121 | static struct kmem_cache *swcr_req_cache; |
| 122 | #endif |
| 123 | |
| 124 | #ifndef CRYPTO_TFM_MODE_CBC |
| 125 | /* |
| 126 | * As of linux-2.6.21 this is no longer defined, and presumably no longer |
| 127 | * needed to be passed into the crypto core code. |
| 128 | */ |
| 129 | #define CRYPTO_TFM_MODE_CBC 0 |
| 130 | #define CRYPTO_TFM_MODE_ECB 0 |
| 131 | #endif |
| 132 | |
| 133 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19) |
| 134 | /* |
| 135 | * Linux 2.6.19 introduced a new Crypto API, setup macro's to convert new |
| 136 | * API into old API. |
| 137 | */ |
| 138 | |
| 139 | /* Symmetric/Block Cipher */ |
| 140 | struct blkcipher_desc |
| 141 | { |
| 142 | struct crypto_tfm *tfm; |
| 143 | void *info; |
| 144 | }; |
| 145 | #define ecb(X) #X , CRYPTO_TFM_MODE_ECB |
| 146 | #define cbc(X) #X , CRYPTO_TFM_MODE_CBC |
| 147 | #define crypto_has_blkcipher(X, Y, Z) crypto_alg_available(X, 0) |
| 148 | #define crypto_blkcipher_cast(X) X |
| 149 | #define crypto_blkcipher_tfm(X) X |
| 150 | #define crypto_alloc_blkcipher(X, Y, Z) crypto_alloc_tfm(X, mode) |
| 151 | #define crypto_blkcipher_ivsize(X) crypto_tfm_alg_ivsize(X) |
| 152 | #define crypto_blkcipher_blocksize(X) crypto_tfm_alg_blocksize(X) |
| 153 | #define crypto_blkcipher_setkey(X, Y, Z) crypto_cipher_setkey(X, Y, Z) |
| 154 | #define crypto_blkcipher_encrypt_iv(W, X, Y, Z) \ |
| 155 | crypto_cipher_encrypt_iv((W)->tfm, X, Y, Z, (u8 *)((W)->info)) |
| 156 | #define crypto_blkcipher_decrypt_iv(W, X, Y, Z) \ |
| 157 | crypto_cipher_decrypt_iv((W)->tfm, X, Y, Z, (u8 *)((W)->info)) |
| 158 | #define crypto_blkcipher_set_flags(x, y) /* nop */ |
| 159 | #define crypto_free_blkcipher(x) crypto_free_tfm(x) |
| 160 | #define crypto_free_comp crypto_free_tfm |
| 161 | #define crypto_free_hash crypto_free_tfm |
| 162 | |
| 163 | /* Hash/HMAC/Digest */ |
| 164 | struct hash_desc |
| 165 | { |
| 166 | struct crypto_tfm *tfm; |
| 167 | }; |
| 168 | #define hmac(X) #X , 0 |
| 169 | #define crypto_has_hash(X, Y, Z) crypto_alg_available(X, 0) |
| 170 | #define crypto_hash_cast(X) X |
| 171 | #define crypto_hash_tfm(X) X |
| 172 | #define crypto_alloc_hash(X, Y, Z) crypto_alloc_tfm(X, mode) |
| 173 | #define crypto_hash_digestsize(X) crypto_tfm_alg_digestsize(X) |
| 174 | #define crypto_hash_digest(W, X, Y, Z) \ |
| 175 | crypto_digest_digest((W)->tfm, X, sg_num, Z) |
| 176 | |
| 177 | /* Asymmetric Cipher */ |
| 178 | #define crypto_has_cipher(X, Y, Z) crypto_alg_available(X, 0) |
| 179 | |
| 180 | /* Compression */ |
| 181 | #define crypto_has_comp(X, Y, Z) crypto_alg_available(X, 0) |
| 182 | #define crypto_comp_tfm(X) X |
| 183 | #define crypto_comp_cast(X) X |
| 184 | #define crypto_alloc_comp(X, Y, Z) crypto_alloc_tfm(X, mode) |
| 185 | #define plain(X) #X , 0 |
| 186 | #else |
| 187 | #define ecb(X) "ecb(" #X ")" , 0 |
| 188 | #define cbc(X) "cbc(" #X ")" , 0 |
| 189 | #define hmac(X) "hmac(" #X ")" , 0 |
| 190 | #define plain(X) #X , 0 |
| 191 | #endif /* if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19) */ |
| 192 | |
| 193 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,22) |
| 194 | /* no ablkcipher in older kernels */ |
| 195 | #define crypto_alloc_ablkcipher(a,b,c) (NULL) |
| 196 | #define crypto_ablkcipher_tfm(x) ((struct crypto_tfm *)(x)) |
| 197 | #define crypto_ablkcipher_set_flags(a, b) /* nop */ |
| 198 | #define crypto_ablkcipher_setkey(x, y, z) (-EINVAL) |
| 199 | #define crypto_has_ablkcipher(a,b,c) (0) |
| 200 | #else |
| 201 | #define HAVE_ABLKCIPHER |
| 202 | #endif |
| 203 | |
| 204 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,32) |
| 205 | /* no ahash in older kernels */ |
| 206 | #define crypto_ahash_tfm(x) ((struct crypto_tfm *)(x)) |
| 207 | #define crypto_alloc_ahash(a,b,c) (NULL) |
| 208 | #define crypto_ahash_digestsize(x) 0 |
| 209 | #else |
| 210 | #define HAVE_AHASH |
| 211 | #endif |
| 212 | |
| 213 | struct crypto_details { |
| 214 | char *alg_name; |
| 215 | int mode; |
| 216 | int sw_type; |
| 217 | }; |
| 218 | |
| 219 | static struct crypto_details crypto_details[] = { |
| 220 | [CRYPTO_DES_CBC] = { cbc(des), SW_TYPE_BLKCIPHER, }, |
| 221 | [CRYPTO_3DES_CBC] = { cbc(des3_ede), SW_TYPE_BLKCIPHER, }, |
| 222 | [CRYPTO_BLF_CBC] = { cbc(blowfish), SW_TYPE_BLKCIPHER, }, |
| 223 | [CRYPTO_CAST_CBC] = { cbc(cast5), SW_TYPE_BLKCIPHER, }, |
| 224 | [CRYPTO_SKIPJACK_CBC] = { cbc(skipjack), SW_TYPE_BLKCIPHER, }, |
| 225 | [CRYPTO_MD5_HMAC] = { hmac(md5), SW_TYPE_HMAC, }, |
| 226 | [CRYPTO_SHA1_HMAC] = { hmac(sha1), SW_TYPE_HMAC, }, |
| 227 | [CRYPTO_RIPEMD160_HMAC] = { hmac(ripemd160), SW_TYPE_HMAC, }, |
| 228 | [CRYPTO_MD5_KPDK] = { plain(md5-kpdk), SW_TYPE_HASH, }, |
| 229 | [CRYPTO_SHA1_KPDK] = { plain(sha1-kpdk), SW_TYPE_HASH, }, |
| 230 | [CRYPTO_AES_CBC] = { cbc(aes), SW_TYPE_BLKCIPHER, }, |
| 231 | [CRYPTO_ARC4] = { ecb(arc4), SW_TYPE_BLKCIPHER, }, |
| 232 | [CRYPTO_MD5] = { plain(md5), SW_TYPE_HASH, }, |
| 233 | [CRYPTO_SHA1] = { plain(sha1), SW_TYPE_HASH, }, |
| 234 | [CRYPTO_NULL_HMAC] = { hmac(digest_null), SW_TYPE_HMAC, }, |
| 235 | [CRYPTO_NULL_CBC] = { cbc(cipher_null), SW_TYPE_BLKCIPHER, }, |
| 236 | [CRYPTO_DEFLATE_COMP] = { plain(deflate), SW_TYPE_COMP, }, |
| 237 | [CRYPTO_SHA2_256_HMAC] = { hmac(sha256), SW_TYPE_HMAC, }, |
| 238 | [CRYPTO_SHA2_384_HMAC] = { hmac(sha384), SW_TYPE_HMAC, }, |
| 239 | [CRYPTO_SHA2_512_HMAC] = { hmac(sha512), SW_TYPE_HMAC, }, |
| 240 | [CRYPTO_CAMELLIA_CBC] = { cbc(camellia), SW_TYPE_BLKCIPHER, }, |
| 241 | [CRYPTO_SHA2_256] = { plain(sha256), SW_TYPE_HASH, }, |
| 242 | [CRYPTO_SHA2_384] = { plain(sha384), SW_TYPE_HASH, }, |
| 243 | [CRYPTO_SHA2_512] = { plain(sha512), SW_TYPE_HASH, }, |
| 244 | [CRYPTO_RIPEMD160] = { plain(ripemd160), SW_TYPE_HASH, }, |
| 245 | }; |
| 246 | |
| 247 | int32_t swcr_id = -1; |
| 248 | module_param(swcr_id, int, 0444); |
| 249 | MODULE_PARM_DESC(swcr_id, "Read-Only OCF ID for cryptosoft driver"); |
| 250 | |
| 251 | int swcr_fail_if_compression_grows = 1; |
| 252 | module_param(swcr_fail_if_compression_grows, int, 0644); |
| 253 | MODULE_PARM_DESC(swcr_fail_if_compression_grows, |
| 254 | "Treat compression that results in more data as a failure"); |
| 255 | |
| 256 | int swcr_no_ahash = 0; |
| 257 | module_param(swcr_no_ahash, int, 0644); |
| 258 | MODULE_PARM_DESC(swcr_no_ahash, |
| 259 | "Do not use async hash/hmac even if available"); |
| 260 | |
| 261 | int swcr_no_ablk = 0; |
| 262 | module_param(swcr_no_ablk, int, 0644); |
| 263 | MODULE_PARM_DESC(swcr_no_ablk, |
| 264 | "Do not use async blk ciphers even if available"); |
| 265 | |
| 266 | static struct swcr_data **swcr_sessions = NULL; |
| 267 | static u_int32_t swcr_sesnum = 0; |
| 268 | |
| 269 | static int swcr_process(device_t, struct cryptop *, int); |
| 270 | static int swcr_newsession(device_t, u_int32_t *, struct cryptoini *); |
| 271 | static int swcr_freesession(device_t, u_int64_t); |
| 272 | |
| 273 | static device_method_t swcr_methods = { |
| 274 | /* crypto device methods */ |
| 275 | DEVMETHOD(cryptodev_newsession, swcr_newsession), |
| 276 | DEVMETHOD(cryptodev_freesession,swcr_freesession), |
| 277 | DEVMETHOD(cryptodev_process, swcr_process), |
| 278 | }; |
| 279 | |
| 280 | #define debug swcr_debug |
| 281 | int swcr_debug = 0; |
| 282 | module_param(swcr_debug, int, 0644); |
| 283 | MODULE_PARM_DESC(swcr_debug, "Enable debug"); |
| 284 | |
| 285 | static void swcr_process_req(struct swcr_req *req); |
| 286 | |
| 287 | /* |
| 288 | * somethings just need to be run with user context no matter whether |
| 289 | * the kernel compression libs use vmalloc/vfree for example. |
| 290 | */ |
| 291 | |
| 292 | typedef struct { |
| 293 | struct work_struct wq; |
| 294 | void (*func)(void *arg); |
| 295 | void *arg; |
| 296 | } execute_later_t; |
| 297 | |
| 298 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,20) |
| 299 | static void |
| 300 | doing_it_now(struct work_struct *wq) |
| 301 | { |
| 302 | execute_later_t *w = container_of(wq, execute_later_t, wq); |
| 303 | (w->func)(w->arg); |
| 304 | kfree(w); |
| 305 | } |
| 306 | #else |
| 307 | static void |
| 308 | doing_it_now(void *arg) |
| 309 | { |
| 310 | execute_later_t *w = (execute_later_t *) arg; |
| 311 | (w->func)(w->arg); |
| 312 | kfree(w); |
| 313 | } |
| 314 | #endif |
| 315 | |
| 316 | static void |
| 317 | execute_later(void (fn)(void *), void *arg) |
| 318 | { |
| 319 | execute_later_t *w; |
| 320 | |
| 321 | w = (execute_later_t *) kmalloc(sizeof(execute_later_t), SLAB_ATOMIC); |
| 322 | if (w) { |
| 323 | memset(w, '\0', sizeof(w)); |
| 324 | w->func = fn; |
| 325 | w->arg = arg; |
| 326 | #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,20) |
| 327 | INIT_WORK(&w->wq, doing_it_now); |
| 328 | #else |
| 329 | INIT_WORK(&w->wq, doing_it_now, w); |
| 330 | #endif |
| 331 | schedule_work(&w->wq); |
| 332 | } |
| 333 | } |
| 334 | |
| 335 | /* |
| 336 | * Generate a new software session. |
| 337 | */ |
| 338 | static int |
| 339 | swcr_newsession(device_t dev, u_int32_t *sid, struct cryptoini *cri) |
| 340 | { |
| 341 | struct swcr_data **swd; |
| 342 | u_int32_t i; |
| 343 | int error; |
| 344 | char *algo; |
| 345 | int mode; |
| 346 | |
| 347 | dprintk("%s()\n", __FUNCTION__); |
| 348 | if (sid == NULL || cri == NULL) { |
| 349 | dprintk("%s,%d - EINVAL\n", __FILE__, __LINE__); |
| 350 | return EINVAL; |
| 351 | } |
| 352 | |
| 353 | if (swcr_sessions) { |
| 354 | for (i = 1; i < swcr_sesnum; i++) |
| 355 | if (swcr_sessions[i] == NULL) |
| 356 | break; |
| 357 | } else |
| 358 | i = 1; /* NB: to silence compiler warning */ |
| 359 | |
| 360 | if (swcr_sessions == NULL || i == swcr_sesnum) { |
| 361 | if (swcr_sessions == NULL) { |
| 362 | i = 1; /* We leave swcr_sessions[0] empty */ |
| 363 | swcr_sesnum = CRYPTO_SW_SESSIONS; |
| 364 | } else |
| 365 | swcr_sesnum *= 2; |
| 366 | |
| 367 | swd = kmalloc(swcr_sesnum * sizeof(struct swcr_data *), SLAB_ATOMIC); |
| 368 | if (swd == NULL) { |
| 369 | /* Reset session number */ |
| 370 | if (swcr_sesnum == CRYPTO_SW_SESSIONS) |
| 371 | swcr_sesnum = 0; |
| 372 | else |
| 373 | swcr_sesnum /= 2; |
| 374 | dprintk("%s,%d: ENOBUFS\n", __FILE__, __LINE__); |
| 375 | return ENOBUFS; |
| 376 | } |
| 377 | memset(swd, 0, swcr_sesnum * sizeof(struct swcr_data *)); |
| 378 | |
| 379 | /* Copy existing sessions */ |
| 380 | if (swcr_sessions) { |
| 381 | memcpy(swd, swcr_sessions, |
| 382 | (swcr_sesnum / 2) * sizeof(struct swcr_data *)); |
| 383 | kfree(swcr_sessions); |
| 384 | } |
| 385 | |
| 386 | swcr_sessions = swd; |
| 387 | } |
| 388 | |
| 389 | swd = &swcr_sessions[i]; |
| 390 | *sid = i; |
| 391 | |
| 392 | while (cri) { |
| 393 | *swd = (struct swcr_data *) kmalloc(sizeof(struct swcr_data), |
| 394 | SLAB_ATOMIC); |
| 395 | if (*swd == NULL) { |
| 396 | swcr_freesession(NULL, i); |
| 397 | dprintk("%s,%d: ENOBUFS\n", __FILE__, __LINE__); |
| 398 | return ENOBUFS; |
| 399 | } |
| 400 | memset(*swd, 0, sizeof(struct swcr_data)); |
| 401 | |
| 402 | if (cri->cri_alg < 0 || |
| 403 | cri->cri_alg>=sizeof(crypto_details)/sizeof(crypto_details[0])){ |
| 404 | printk("cryptosoft: Unknown algorithm 0x%x\n", cri->cri_alg); |
| 405 | swcr_freesession(NULL, i); |
| 406 | return EINVAL; |
| 407 | } |
| 408 | |
| 409 | algo = crypto_details[cri->cri_alg].alg_name; |
| 410 | if (!algo || !*algo) { |
| 411 | printk("cryptosoft: Unsupported algorithm 0x%x\n", cri->cri_alg); |
| 412 | swcr_freesession(NULL, i); |
| 413 | return EINVAL; |
| 414 | } |
| 415 | |
| 416 | mode = crypto_details[cri->cri_alg].mode; |
| 417 | (*swd)->sw_type = crypto_details[cri->cri_alg].sw_type; |
| 418 | (*swd)->sw_alg = cri->cri_alg; |
| 419 | |
| 420 | spin_lock_init(&(*swd)->sw_tfm_lock); |
| 421 | |
| 422 | /* Algorithm specific configuration */ |
| 423 | switch (cri->cri_alg) { |
| 424 | case CRYPTO_NULL_CBC: |
| 425 | cri->cri_klen = 0; /* make it work with crypto API */ |
| 426 | break; |
| 427 | default: |
| 428 | break; |
| 429 | } |
| 430 | |
| 431 | if ((*swd)->sw_type & SW_TYPE_BLKCIPHER) { |
| 432 | dprintk("%s crypto_alloc_*blkcipher(%s, 0x%x)\n", __FUNCTION__, |
| 433 | algo, mode); |
| 434 | |
| 435 | /* try async first */ |
| 436 | (*swd)->sw_tfm = swcr_no_ablk ? NULL : |
| 437 | crypto_ablkcipher_tfm(crypto_alloc_ablkcipher(algo, 0, 0)); |
| 438 | if ((*swd)->sw_tfm && !IS_ERR((*swd)->sw_tfm)) { |
| 439 | dprintk("%s %s cipher is async\n", __FUNCTION__, algo); |
| 440 | (*swd)->sw_type |= SW_TYPE_ASYNC; |
| 441 | } else { |
| 442 | (*swd)->sw_tfm = crypto_blkcipher_tfm( |
| 443 | crypto_alloc_blkcipher(algo, 0, CRYPTO_ALG_ASYNC)); |
| 444 | if ((*swd)->sw_tfm && !IS_ERR((*swd)->sw_tfm)) |
| 445 | dprintk("%s %s cipher is sync\n", __FUNCTION__, algo); |
| 446 | } |
| 447 | if (!(*swd)->sw_tfm || IS_ERR((*swd)->sw_tfm)) { |
| 448 | int err; |
| 449 | dprintk("cryptosoft: crypto_alloc_blkcipher failed(%s, 0x%x)\n", |
| 450 | algo,mode); |
| 451 | err = IS_ERR((*swd)->sw_tfm) ? -(PTR_ERR((*swd)->sw_tfm)) : EINVAL; |
| 452 | (*swd)->sw_tfm = NULL; /* ensure NULL */ |
| 453 | swcr_freesession(NULL, i); |
| 454 | return err; |
| 455 | } |
| 456 | |
| 457 | if (debug) { |
| 458 | dprintk("%s key:cri->cri_klen=%d,(cri->cri_klen + 7)/8=%d", |
| 459 | __FUNCTION__, cri->cri_klen, (cri->cri_klen + 7) / 8); |
| 460 | for (i = 0; i < (cri->cri_klen + 7) / 8; i++) |
| 461 | dprintk("%s0x%x", (i % 8) ? " " : "\n ", |
| 462 | cri->cri_key[i] & 0xff); |
| 463 | dprintk("\n"); |
| 464 | } |
| 465 | if ((*swd)->sw_type & SW_TYPE_ASYNC) { |
| 466 | /* OCF doesn't enforce keys */ |
| 467 | crypto_ablkcipher_set_flags( |
| 468 | __crypto_ablkcipher_cast((*swd)->sw_tfm), |
| 469 | CRYPTO_TFM_REQ_WEAK_KEY); |
| 470 | error = crypto_ablkcipher_setkey( |
| 471 | __crypto_ablkcipher_cast((*swd)->sw_tfm), |
| 472 | cri->cri_key, (cri->cri_klen + 7) / 8); |
| 473 | } else { |
| 474 | /* OCF doesn't enforce keys */ |
| 475 | crypto_blkcipher_set_flags( |
| 476 | crypto_blkcipher_cast((*swd)->sw_tfm), |
| 477 | CRYPTO_TFM_REQ_WEAK_KEY); |
| 478 | error = crypto_blkcipher_setkey( |
| 479 | crypto_blkcipher_cast((*swd)->sw_tfm), |
| 480 | cri->cri_key, (cri->cri_klen + 7) / 8); |
| 481 | } |
| 482 | if (error) { |
| 483 | printk("cryptosoft: setkey failed %d (crt_flags=0x%x)\n", error, |
| 484 | (*swd)->sw_tfm->crt_flags); |
| 485 | swcr_freesession(NULL, i); |
| 486 | return error; |
| 487 | } |
| 488 | } else if ((*swd)->sw_type & (SW_TYPE_HMAC | SW_TYPE_HASH)) { |
| 489 | dprintk("%s crypto_alloc_*hash(%s, 0x%x)\n", __FUNCTION__, |
| 490 | algo, mode); |
| 491 | |
| 492 | /* try async first */ |
| 493 | (*swd)->sw_tfm = swcr_no_ahash ? NULL : |
| 494 | crypto_ahash_tfm(crypto_alloc_ahash(algo, 0, 0)); |
| 495 | if ((*swd)->sw_tfm) { |
| 496 | dprintk("%s %s hash is async\n", __FUNCTION__, algo); |
| 497 | (*swd)->sw_type |= SW_TYPE_ASYNC; |
| 498 | } else { |
| 499 | dprintk("%s %s hash is sync\n", __FUNCTION__, algo); |
| 500 | (*swd)->sw_tfm = crypto_hash_tfm( |
| 501 | crypto_alloc_hash(algo, 0, CRYPTO_ALG_ASYNC)); |
| 502 | } |
| 503 | |
| 504 | if (!(*swd)->sw_tfm) { |
| 505 | dprintk("cryptosoft: crypto_alloc_hash failed(%s,0x%x)\n", |
| 506 | algo, mode); |
| 507 | swcr_freesession(NULL, i); |
| 508 | return EINVAL; |
| 509 | } |
| 510 | |
| 511 | (*swd)->u.hmac.sw_klen = (cri->cri_klen + 7) / 8; |
| 512 | (*swd)->u.hmac.sw_key = (char *)kmalloc((*swd)->u.hmac.sw_klen, |
| 513 | SLAB_ATOMIC); |
| 514 | if ((*swd)->u.hmac.sw_key == NULL) { |
| 515 | swcr_freesession(NULL, i); |
| 516 | dprintk("%s,%d: ENOBUFS\n", __FILE__, __LINE__); |
| 517 | return ENOBUFS; |
| 518 | } |
| 519 | memcpy((*swd)->u.hmac.sw_key, cri->cri_key, (*swd)->u.hmac.sw_klen); |
| 520 | if (cri->cri_mlen) { |
| 521 | (*swd)->u.hmac.sw_mlen = cri->cri_mlen; |
| 522 | } else if ((*swd)->sw_type & SW_TYPE_ASYNC) { |
| 523 | (*swd)->u.hmac.sw_mlen = crypto_ahash_digestsize( |
| 524 | __crypto_ahash_cast((*swd)->sw_tfm)); |
| 525 | } else { |
| 526 | (*swd)->u.hmac.sw_mlen = crypto_hash_digestsize( |
| 527 | crypto_hash_cast((*swd)->sw_tfm)); |
| 528 | } |
| 529 | } else if ((*swd)->sw_type & SW_TYPE_COMP) { |
| 530 | (*swd)->sw_tfm = crypto_comp_tfm( |
| 531 | crypto_alloc_comp(algo, 0, CRYPTO_ALG_ASYNC)); |
| 532 | if (!(*swd)->sw_tfm) { |
| 533 | dprintk("cryptosoft: crypto_alloc_comp failed(%s,0x%x)\n", |
| 534 | algo, mode); |
| 535 | swcr_freesession(NULL, i); |
| 536 | return EINVAL; |
| 537 | } |
| 538 | (*swd)->u.sw_comp_buf = kmalloc(CRYPTO_MAX_DATA_LEN, SLAB_ATOMIC); |
| 539 | if ((*swd)->u.sw_comp_buf == NULL) { |
| 540 | swcr_freesession(NULL, i); |
| 541 | dprintk("%s,%d: ENOBUFS\n", __FILE__, __LINE__); |
| 542 | return ENOBUFS; |
| 543 | } |
| 544 | } else { |
| 545 | printk("cryptosoft: Unhandled sw_type %d\n", (*swd)->sw_type); |
| 546 | swcr_freesession(NULL, i); |
| 547 | return EINVAL; |
| 548 | } |
| 549 | |
| 550 | cri = cri->cri_next; |
| 551 | swd = &((*swd)->sw_next); |
| 552 | } |
| 553 | return 0; |
| 554 | } |
| 555 | |
| 556 | /* |
| 557 | * Free a session. |
| 558 | */ |
| 559 | static int |
| 560 | swcr_freesession(device_t dev, u_int64_t tid) |
| 561 | { |
| 562 | struct swcr_data *swd; |
| 563 | u_int32_t sid = CRYPTO_SESID2LID(tid); |
| 564 | |
| 565 | dprintk("%s()\n", __FUNCTION__); |
| 566 | if (sid > swcr_sesnum || swcr_sessions == NULL || |
| 567 | swcr_sessions[sid] == NULL) { |
| 568 | dprintk("%s,%d: EINVAL\n", __FILE__, __LINE__); |
| 569 | return(EINVAL); |
| 570 | } |
| 571 | |
| 572 | /* Silently accept and return */ |
| 573 | if (sid == 0) |
| 574 | return(0); |
| 575 | |
| 576 | while ((swd = swcr_sessions[sid]) != NULL) { |
| 577 | swcr_sessions[sid] = swd->sw_next; |
| 578 | if (swd->sw_tfm) { |
| 579 | switch (swd->sw_type & SW_TYPE_ALG_AMASK) { |
| 580 | #ifdef HAVE_AHASH |
| 581 | case SW_TYPE_AHMAC: |
| 582 | case SW_TYPE_AHASH: |
| 583 | crypto_free_ahash(__crypto_ahash_cast(swd->sw_tfm)); |
| 584 | break; |
| 585 | #endif |
| 586 | #ifdef HAVE_ABLKCIPHER |
| 587 | case SW_TYPE_ABLKCIPHER: |
| 588 | crypto_free_ablkcipher(__crypto_ablkcipher_cast(swd->sw_tfm)); |
| 589 | break; |
| 590 | #endif |
| 591 | case SW_TYPE_BLKCIPHER: |
| 592 | crypto_free_blkcipher(crypto_blkcipher_cast(swd->sw_tfm)); |
| 593 | break; |
| 594 | case SW_TYPE_HMAC: |
| 595 | case SW_TYPE_HASH: |
| 596 | crypto_free_hash(crypto_hash_cast(swd->sw_tfm)); |
| 597 | break; |
| 598 | case SW_TYPE_COMP: |
| 599 | if (in_interrupt()) |
| 600 | execute_later((void (*)(void *))crypto_free_comp, (void *)crypto_comp_cast(swd->sw_tfm)); |
| 601 | else |
| 602 | crypto_free_comp(crypto_comp_cast(swd->sw_tfm)); |
| 603 | break; |
| 604 | default: |
| 605 | crypto_free_tfm(swd->sw_tfm); |
| 606 | break; |
| 607 | } |
| 608 | swd->sw_tfm = NULL; |
| 609 | } |
| 610 | if (swd->sw_type & SW_TYPE_COMP) { |
| 611 | if (swd->u.sw_comp_buf) |
| 612 | kfree(swd->u.sw_comp_buf); |
| 613 | } else { |
| 614 | if (swd->u.hmac.sw_key) |
| 615 | kfree(swd->u.hmac.sw_key); |
| 616 | } |
| 617 | kfree(swd); |
| 618 | } |
| 619 | return 0; |
| 620 | } |
| 621 | |
| 622 | static void swcr_process_req_complete(struct swcr_req *req) |
| 623 | { |
| 624 | dprintk("%s()\n", __FUNCTION__); |
| 625 | |
| 626 | if (req->sw->sw_type & SW_TYPE_INUSE) { |
| 627 | unsigned long flags; |
| 628 | spin_lock_irqsave(&req->sw->sw_tfm_lock, flags); |
| 629 | req->sw->sw_type &= ~SW_TYPE_INUSE; |
| 630 | spin_unlock_irqrestore(&req->sw->sw_tfm_lock, flags); |
| 631 | } |
| 632 | |
| 633 | if (req->crp->crp_etype) |
| 634 | goto done; |
| 635 | |
| 636 | switch (req->sw->sw_type & SW_TYPE_ALG_AMASK) { |
| 637 | #if defined(HAVE_AHASH) |
| 638 | case SW_TYPE_AHMAC: |
| 639 | case SW_TYPE_AHASH: |
| 640 | crypto_copyback(req->crp->crp_flags, req->crp->crp_buf, |
| 641 | req->crd->crd_inject, req->sw->u.hmac.sw_mlen, req->result); |
| 642 | ahash_request_free(req->crypto_req); |
| 643 | break; |
| 644 | #endif |
| 645 | #if defined(HAVE_ABLKCIPHER) |
| 646 | case SW_TYPE_ABLKCIPHER: |
| 647 | ablkcipher_request_free(req->crypto_req); |
| 648 | break; |
| 649 | #endif |
| 650 | case SW_TYPE_CIPHER: |
| 651 | case SW_TYPE_HMAC: |
| 652 | case SW_TYPE_HASH: |
| 653 | case SW_TYPE_COMP: |
| 654 | case SW_TYPE_BLKCIPHER: |
| 655 | break; |
| 656 | default: |
| 657 | req->crp->crp_etype = EINVAL; |
| 658 | goto done; |
| 659 | } |
| 660 | |
| 661 | req->crd = req->crd->crd_next; |
| 662 | if (req->crd) { |
| 663 | swcr_process_req(req); |
| 664 | return; |
| 665 | } |
| 666 | |
| 667 | done: |
| 668 | dprintk("%s crypto_done %p\n", __FUNCTION__, req); |
| 669 | crypto_done(req->crp); |
| 670 | kmem_cache_free(swcr_req_cache, req); |
| 671 | } |
| 672 | |
| 673 | #if defined(HAVE_ABLKCIPHER) || defined(HAVE_AHASH) |
| 674 | static void swcr_process_callback(struct crypto_async_request *creq, int err) |
| 675 | { |
| 676 | struct swcr_req *req = creq->data; |
| 677 | |
| 678 | dprintk("%s()\n", __FUNCTION__); |
| 679 | if (err) { |
| 680 | if (err == -EINPROGRESS) |
| 681 | return; |
| 682 | dprintk("%s() fail %d\n", __FUNCTION__, -err); |
| 683 | req->crp->crp_etype = -err; |
| 684 | } |
| 685 | |
| 686 | swcr_process_req_complete(req); |
| 687 | } |
| 688 | #endif /* defined(HAVE_ABLKCIPHER) || defined(HAVE_AHASH) */ |
| 689 | |
| 690 | |
| 691 | static void swcr_process_req(struct swcr_req *req) |
| 692 | { |
| 693 | struct swcr_data *sw; |
| 694 | struct cryptop *crp = req->crp; |
| 695 | struct cryptodesc *crd = req->crd; |
| 696 | struct sk_buff *skb = (struct sk_buff *) crp->crp_buf; |
| 697 | struct uio *uiop = (struct uio *) crp->crp_buf; |
| 698 | int sg_num, sg_len, skip; |
| 699 | |
| 700 | dprintk("%s()\n", __FUNCTION__); |
| 701 | |
| 702 | /* |
| 703 | * Find the crypto context. |
| 704 | * |
| 705 | * XXX Note that the logic here prevents us from having |
| 706 | * XXX the same algorithm multiple times in a session |
| 707 | * XXX (or rather, we can but it won't give us the right |
| 708 | * XXX results). To do that, we'd need some way of differentiating |
| 709 | * XXX between the various instances of an algorithm (so we can |
| 710 | * XXX locate the correct crypto context). |
| 711 | */ |
| 712 | for (sw = req->sw_head; sw && sw->sw_alg != crd->crd_alg; sw = sw->sw_next) |
| 713 | ; |
| 714 | |
| 715 | /* No such context ? */ |
| 716 | if (sw == NULL) { |
| 717 | crp->crp_etype = EINVAL; |
| 718 | dprintk("%s,%d: EINVAL\n", __FILE__, __LINE__); |
| 719 | goto done; |
| 720 | } |
| 721 | |
| 722 | /* |
| 723 | * for some types we need to ensure only one user as info is stored in |
| 724 | * the tfm during an operation that can get corrupted |
| 725 | */ |
| 726 | switch (sw->sw_type & SW_TYPE_ALG_AMASK) { |
| 727 | #ifdef HAVE_AHASH |
| 728 | case SW_TYPE_AHMAC: |
| 729 | case SW_TYPE_AHASH: |
| 730 | #endif |
| 731 | case SW_TYPE_HMAC: |
| 732 | case SW_TYPE_HASH: { |
| 733 | unsigned long flags; |
| 734 | spin_lock_irqsave(&sw->sw_tfm_lock, flags); |
| 735 | if (sw->sw_type & SW_TYPE_INUSE) { |
| 736 | spin_unlock_irqrestore(&sw->sw_tfm_lock, flags); |
| 737 | execute_later((void (*)(void *))swcr_process_req, (void *)req); |
| 738 | return; |
| 739 | } |
| 740 | sw->sw_type |= SW_TYPE_INUSE; |
| 741 | spin_unlock_irqrestore(&sw->sw_tfm_lock, flags); |
| 742 | } break; |
| 743 | } |
| 744 | |
| 745 | req->sw = sw; |
| 746 | skip = crd->crd_skip; |
| 747 | |
| 748 | /* |
| 749 | * setup the SG list skip from the start of the buffer |
| 750 | */ |
| 751 | memset(req->sg, 0, sizeof(req->sg)); |
| 752 | sg_init_table(req->sg, SCATTERLIST_MAX); |
| 753 | if (crp->crp_flags & CRYPTO_F_SKBUF) { |
| 754 | int i, len; |
| 755 | |
| 756 | sg_num = 0; |
| 757 | sg_len = 0; |
| 758 | |
| 759 | if (skip < skb_headlen(skb)) { |
| 760 | len = skb_headlen(skb) - skip; |
| 761 | if (len + sg_len > crd->crd_len) |
| 762 | len = crd->crd_len - sg_len; |
| 763 | sg_set_page(&req->sg[sg_num], |
| 764 | virt_to_page(skb->data + skip), len, |
| 765 | offset_in_page(skb->data + skip)); |
| 766 | sg_len += len; |
| 767 | sg_num++; |
| 768 | skip = 0; |
| 769 | } else |
| 770 | skip -= skb_headlen(skb); |
| 771 | |
| 772 | for (i = 0; sg_len < crd->crd_len && |
| 773 | i < skb_shinfo(skb)->nr_frags && |
| 774 | sg_num < SCATTERLIST_MAX; i++) { |
| 775 | if (skip < skb_shinfo(skb)->frags[i].size) { |
| 776 | len = skb_shinfo(skb)->frags[i].size - skip; |
| 777 | if (len + sg_len > crd->crd_len) |
| 778 | len = crd->crd_len - sg_len; |
| 779 | sg_set_page(&req->sg[sg_num], |
| 780 | skb_frag_page(&skb_shinfo(skb)->frags[i]), |
| 781 | len, |
| 782 | skb_shinfo(skb)->frags[i].page_offset + skip); |
| 783 | sg_len += len; |
| 784 | sg_num++; |
| 785 | skip = 0; |
| 786 | } else |
| 787 | skip -= skb_shinfo(skb)->frags[i].size; |
| 788 | } |
| 789 | } else if (crp->crp_flags & CRYPTO_F_IOV) { |
| 790 | int len; |
| 791 | |
| 792 | sg_len = 0; |
| 793 | for (sg_num = 0; sg_len < crd->crd_len && |
| 794 | sg_num < uiop->uio_iovcnt && |
| 795 | sg_num < SCATTERLIST_MAX; sg_num++) { |
| 796 | if (skip <= uiop->uio_iov[sg_num].iov_len) { |
| 797 | len = uiop->uio_iov[sg_num].iov_len - skip; |
| 798 | if (len + sg_len > crd->crd_len) |
| 799 | len = crd->crd_len - sg_len; |
| 800 | sg_set_page(&req->sg[sg_num], |
| 801 | virt_to_page(uiop->uio_iov[sg_num].iov_base+skip), |
| 802 | len, |
| 803 | offset_in_page(uiop->uio_iov[sg_num].iov_base+skip)); |
| 804 | sg_len += len; |
| 805 | skip = 0; |
| 806 | } else |
| 807 | skip -= uiop->uio_iov[sg_num].iov_len; |
| 808 | } |
| 809 | } else { |
| 810 | sg_len = (crp->crp_ilen - skip); |
| 811 | if (sg_len > crd->crd_len) |
| 812 | sg_len = crd->crd_len; |
| 813 | sg_set_page(&req->sg[0], virt_to_page(crp->crp_buf + skip), |
| 814 | sg_len, offset_in_page(crp->crp_buf + skip)); |
| 815 | sg_num = 1; |
| 816 | } |
| 817 | |
| 818 | switch (sw->sw_type & SW_TYPE_ALG_AMASK) { |
| 819 | |
| 820 | #ifdef HAVE_AHASH |
| 821 | case SW_TYPE_AHMAC: |
| 822 | case SW_TYPE_AHASH: |
| 823 | { |
| 824 | int ret; |
| 825 | |
| 826 | /* check we have room for the result */ |
| 827 | if (crp->crp_ilen - crd->crd_inject < sw->u.hmac.sw_mlen) { |
| 828 | dprintk("cryptosoft: EINVAL crp_ilen=%d, len=%d, inject=%d " |
| 829 | "digestsize=%d\n", crp->crp_ilen, crd->crd_skip + sg_len, |
| 830 | crd->crd_inject, sw->u.hmac.sw_mlen); |
| 831 | crp->crp_etype = EINVAL; |
| 832 | goto done; |
| 833 | } |
| 834 | |
| 835 | req->crypto_req = |
| 836 | ahash_request_alloc(__crypto_ahash_cast(sw->sw_tfm),GFP_ATOMIC); |
| 837 | if (!req->crypto_req) { |
| 838 | crp->crp_etype = ENOMEM; |
| 839 | dprintk("%s,%d: ENOMEM ahash_request_alloc", __FILE__, __LINE__); |
| 840 | goto done; |
| 841 | } |
| 842 | |
| 843 | ahash_request_set_callback(req->crypto_req, |
| 844 | CRYPTO_TFM_REQ_MAY_BACKLOG, swcr_process_callback, req); |
| 845 | |
| 846 | memset(req->result, 0, sizeof(req->result)); |
| 847 | |
| 848 | if (sw->sw_type & SW_TYPE_AHMAC) |
| 849 | crypto_ahash_setkey(__crypto_ahash_cast(sw->sw_tfm), |
| 850 | sw->u.hmac.sw_key, sw->u.hmac.sw_klen); |
| 851 | ahash_request_set_crypt(req->crypto_req, req->sg, req->result, sg_len); |
| 852 | ret = crypto_ahash_digest(req->crypto_req); |
| 853 | switch (ret) { |
| 854 | case -EINPROGRESS: |
| 855 | case -EBUSY: |
| 856 | return; |
| 857 | default: |
| 858 | case 0: |
| 859 | dprintk("hash OP %s %d\n", ret ? "failed" : "success", ret); |
| 860 | crp->crp_etype = ret; |
| 861 | goto done; |
| 862 | } |
| 863 | } break; |
| 864 | #endif /* HAVE_AHASH */ |
| 865 | |
| 866 | #ifdef HAVE_ABLKCIPHER |
| 867 | case SW_TYPE_ABLKCIPHER: { |
| 868 | int ret; |
| 869 | unsigned char *ivp = req->iv; |
| 870 | int ivsize = |
| 871 | crypto_ablkcipher_ivsize(__crypto_ablkcipher_cast(sw->sw_tfm)); |
| 872 | |
| 873 | if (sg_len < crypto_ablkcipher_blocksize( |
| 874 | __crypto_ablkcipher_cast(sw->sw_tfm))) { |
| 875 | crp->crp_etype = EINVAL; |
| 876 | dprintk("%s,%d: EINVAL len %d < %d\n", __FILE__, __LINE__, |
| 877 | sg_len, crypto_ablkcipher_blocksize( |
| 878 | __crypto_ablkcipher_cast(sw->sw_tfm))); |
| 879 | goto done; |
| 880 | } |
| 881 | |
| 882 | if (ivsize > sizeof(req->iv)) { |
| 883 | crp->crp_etype = EINVAL; |
| 884 | dprintk("%s,%d: EINVAL\n", __FILE__, __LINE__); |
| 885 | goto done; |
| 886 | } |
| 887 | |
| 888 | req->crypto_req = ablkcipher_request_alloc( |
| 889 | __crypto_ablkcipher_cast(sw->sw_tfm), GFP_ATOMIC); |
| 890 | if (!req->crypto_req) { |
| 891 | crp->crp_etype = ENOMEM; |
| 892 | dprintk("%s,%d: ENOMEM ablkcipher_request_alloc", |
| 893 | __FILE__, __LINE__); |
| 894 | goto done; |
| 895 | } |
| 896 | |
| 897 | ablkcipher_request_set_callback(req->crypto_req, |
| 898 | CRYPTO_TFM_REQ_MAY_BACKLOG, swcr_process_callback, req); |
| 899 | |
| 900 | if (crd->crd_flags & CRD_F_KEY_EXPLICIT) { |
| 901 | int i, error; |
| 902 | |
| 903 | if (debug) { |
| 904 | dprintk("%s key:", __FUNCTION__); |
| 905 | for (i = 0; i < (crd->crd_klen + 7) / 8; i++) |
| 906 | dprintk("%s0x%x", (i % 8) ? " " : "\n ", |
| 907 | crd->crd_key[i] & 0xff); |
| 908 | dprintk("\n"); |
| 909 | } |
| 910 | /* OCF doesn't enforce keys */ |
| 911 | crypto_ablkcipher_set_flags(__crypto_ablkcipher_cast(sw->sw_tfm), |
| 912 | CRYPTO_TFM_REQ_WEAK_KEY); |
| 913 | error = crypto_ablkcipher_setkey( |
| 914 | __crypto_ablkcipher_cast(sw->sw_tfm), crd->crd_key, |
| 915 | (crd->crd_klen + 7) / 8); |
| 916 | if (error) { |
| 917 | dprintk("cryptosoft: setkey failed %d (crt_flags=0x%x)\n", |
| 918 | error, sw->sw_tfm->crt_flags); |
| 919 | crp->crp_etype = -error; |
| 920 | } |
| 921 | } |
| 922 | |
| 923 | if (crd->crd_flags & CRD_F_ENCRYPT) { /* encrypt */ |
| 924 | |
| 925 | if (crd->crd_flags & CRD_F_IV_EXPLICIT) |
| 926 | ivp = crd->crd_iv; |
| 927 | else |
| 928 | get_random_bytes(ivp, ivsize); |
| 929 | /* |
| 930 | * do we have to copy the IV back to the buffer ? |
| 931 | */ |
| 932 | if ((crd->crd_flags & CRD_F_IV_PRESENT) == 0) { |
| 933 | crypto_copyback(crp->crp_flags, crp->crp_buf, |
| 934 | crd->crd_inject, ivsize, (caddr_t)ivp); |
| 935 | } |
| 936 | ablkcipher_request_set_crypt(req->crypto_req, req->sg, req->sg, |
| 937 | sg_len, ivp); |
| 938 | ret = crypto_ablkcipher_encrypt(req->crypto_req); |
| 939 | |
| 940 | } else { /*decrypt */ |
| 941 | |
| 942 | if (crd->crd_flags & CRD_F_IV_EXPLICIT) |
| 943 | ivp = crd->crd_iv; |
| 944 | else |
| 945 | crypto_copydata(crp->crp_flags, crp->crp_buf, |
| 946 | crd->crd_inject, ivsize, (caddr_t)ivp); |
| 947 | ablkcipher_request_set_crypt(req->crypto_req, req->sg, req->sg, |
| 948 | sg_len, ivp); |
| 949 | ret = crypto_ablkcipher_decrypt(req->crypto_req); |
| 950 | } |
| 951 | |
| 952 | switch (ret) { |
| 953 | case -EINPROGRESS: |
| 954 | case -EBUSY: |
| 955 | return; |
| 956 | default: |
| 957 | case 0: |
| 958 | dprintk("crypto OP %s %d\n", ret ? "failed" : "success", ret); |
| 959 | crp->crp_etype = ret; |
| 960 | goto done; |
| 961 | } |
| 962 | } break; |
| 963 | #endif /* HAVE_ABLKCIPHER */ |
| 964 | |
| 965 | case SW_TYPE_BLKCIPHER: { |
| 966 | unsigned char iv[EALG_MAX_BLOCK_LEN]; |
| 967 | unsigned char *ivp = iv; |
| 968 | struct blkcipher_desc desc; |
| 969 | int ivsize = crypto_blkcipher_ivsize(crypto_blkcipher_cast(sw->sw_tfm)); |
| 970 | |
| 971 | if (sg_len < crypto_blkcipher_blocksize( |
| 972 | crypto_blkcipher_cast(sw->sw_tfm))) { |
| 973 | crp->crp_etype = EINVAL; |
| 974 | dprintk("%s,%d: EINVAL len %d < %d\n", __FILE__, __LINE__, |
| 975 | sg_len, crypto_blkcipher_blocksize( |
| 976 | crypto_blkcipher_cast(sw->sw_tfm))); |
| 977 | goto done; |
| 978 | } |
| 979 | |
| 980 | if (ivsize > sizeof(iv)) { |
| 981 | crp->crp_etype = EINVAL; |
| 982 | dprintk("%s,%d: EINVAL\n", __FILE__, __LINE__); |
| 983 | goto done; |
| 984 | } |
| 985 | |
| 986 | if (crd->crd_flags & CRD_F_KEY_EXPLICIT) { |
| 987 | int i, error; |
| 988 | |
| 989 | if (debug) { |
| 990 | dprintk("%s key:", __FUNCTION__); |
| 991 | for (i = 0; i < (crd->crd_klen + 7) / 8; i++) |
| 992 | dprintk("%s0x%x", (i % 8) ? " " : "\n ", |
| 993 | crd->crd_key[i] & 0xff); |
| 994 | dprintk("\n"); |
| 995 | } |
| 996 | /* OCF doesn't enforce keys */ |
| 997 | crypto_blkcipher_set_flags(crypto_blkcipher_cast(sw->sw_tfm), |
| 998 | CRYPTO_TFM_REQ_WEAK_KEY); |
| 999 | error = crypto_blkcipher_setkey( |
| 1000 | crypto_blkcipher_cast(sw->sw_tfm), crd->crd_key, |
| 1001 | (crd->crd_klen + 7) / 8); |
| 1002 | if (error) { |
| 1003 | dprintk("cryptosoft: setkey failed %d (crt_flags=0x%x)\n", |
| 1004 | error, sw->sw_tfm->crt_flags); |
| 1005 | crp->crp_etype = -error; |
| 1006 | } |
| 1007 | } |
| 1008 | |
| 1009 | memset(&desc, 0, sizeof(desc)); |
| 1010 | desc.tfm = crypto_blkcipher_cast(sw->sw_tfm); |
| 1011 | |
| 1012 | if (crd->crd_flags & CRD_F_ENCRYPT) { /* encrypt */ |
| 1013 | |
| 1014 | if (crd->crd_flags & CRD_F_IV_EXPLICIT) { |
| 1015 | ivp = crd->crd_iv; |
| 1016 | } else { |
| 1017 | get_random_bytes(ivp, ivsize); |
| 1018 | } |
| 1019 | /* |
| 1020 | * do we have to copy the IV back to the buffer ? |
| 1021 | */ |
| 1022 | if ((crd->crd_flags & CRD_F_IV_PRESENT) == 0) { |
| 1023 | crypto_copyback(crp->crp_flags, crp->crp_buf, |
| 1024 | crd->crd_inject, ivsize, (caddr_t)ivp); |
| 1025 | } |
| 1026 | desc.info = ivp; |
| 1027 | crypto_blkcipher_encrypt_iv(&desc, req->sg, req->sg, sg_len); |
| 1028 | |
| 1029 | } else { /*decrypt */ |
| 1030 | |
| 1031 | if (crd->crd_flags & CRD_F_IV_EXPLICIT) { |
| 1032 | ivp = crd->crd_iv; |
| 1033 | } else { |
| 1034 | crypto_copydata(crp->crp_flags, crp->crp_buf, |
| 1035 | crd->crd_inject, ivsize, (caddr_t)ivp); |
| 1036 | } |
| 1037 | desc.info = ivp; |
| 1038 | crypto_blkcipher_decrypt_iv(&desc, req->sg, req->sg, sg_len); |
| 1039 | } |
| 1040 | } break; |
| 1041 | |
| 1042 | case SW_TYPE_HMAC: |
| 1043 | case SW_TYPE_HASH: |
| 1044 | { |
| 1045 | char result[HASH_MAX_LEN]; |
| 1046 | struct hash_desc desc; |
| 1047 | |
| 1048 | /* check we have room for the result */ |
| 1049 | if (crp->crp_ilen - crd->crd_inject < sw->u.hmac.sw_mlen) { |
| 1050 | dprintk("cryptosoft: EINVAL crp_ilen=%d, len=%d, inject=%d " |
| 1051 | "digestsize=%d\n", crp->crp_ilen, crd->crd_skip + sg_len, |
| 1052 | crd->crd_inject, sw->u.hmac.sw_mlen); |
| 1053 | crp->crp_etype = EINVAL; |
| 1054 | goto done; |
| 1055 | } |
| 1056 | |
| 1057 | memset(&desc, 0, sizeof(desc)); |
| 1058 | desc.tfm = crypto_hash_cast(sw->sw_tfm); |
| 1059 | |
| 1060 | memset(result, 0, sizeof(result)); |
| 1061 | |
| 1062 | if (sw->sw_type & SW_TYPE_HMAC) { |
| 1063 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19) |
| 1064 | crypto_hmac(sw->sw_tfm, sw->u.hmac.sw_key, &sw->u.hmac.sw_klen, |
| 1065 | req->sg, sg_num, result); |
| 1066 | #else |
| 1067 | crypto_hash_setkey(desc.tfm, sw->u.hmac.sw_key, |
| 1068 | sw->u.hmac.sw_klen); |
| 1069 | crypto_hash_digest(&desc, req->sg, sg_len, result); |
| 1070 | #endif /* LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19) */ |
| 1071 | |
| 1072 | } else { /* SW_TYPE_HASH */ |
| 1073 | crypto_hash_digest(&desc, req->sg, sg_len, result); |
| 1074 | } |
| 1075 | |
| 1076 | crypto_copyback(crp->crp_flags, crp->crp_buf, |
| 1077 | crd->crd_inject, sw->u.hmac.sw_mlen, result); |
| 1078 | } |
| 1079 | break; |
| 1080 | |
| 1081 | case SW_TYPE_COMP: { |
| 1082 | void *ibuf = NULL; |
| 1083 | void *obuf = sw->u.sw_comp_buf; |
| 1084 | int ilen = sg_len, olen = CRYPTO_MAX_DATA_LEN; |
| 1085 | int ret = 0; |
| 1086 | |
| 1087 | /* |
| 1088 | * we need to use an additional copy if there is more than one |
| 1089 | * input chunk since the kernel comp routines do not handle |
| 1090 | * SG yet. Otherwise we just use the input buffer as is. |
| 1091 | * Rather than allocate another buffer we just split the tmp |
| 1092 | * buffer we already have. |
| 1093 | * Perhaps we should just use zlib directly ? |
| 1094 | */ |
| 1095 | if (sg_num > 1) { |
| 1096 | int blk; |
| 1097 | |
| 1098 | ibuf = obuf; |
| 1099 | for (blk = 0; blk < sg_num; blk++) { |
| 1100 | memcpy(obuf, sg_virt(&req->sg[blk]), |
| 1101 | req->sg[blk].length); |
| 1102 | obuf += req->sg[blk].length; |
| 1103 | } |
| 1104 | olen -= sg_len; |
| 1105 | } else |
| 1106 | ibuf = sg_virt(&req->sg[0]); |
| 1107 | |
| 1108 | if (crd->crd_flags & CRD_F_ENCRYPT) { /* compress */ |
| 1109 | ret = crypto_comp_compress(crypto_comp_cast(sw->sw_tfm), |
| 1110 | ibuf, ilen, obuf, &olen); |
| 1111 | if (!ret && olen > crd->crd_len) { |
| 1112 | dprintk("cryptosoft: ERANGE compress %d into %d\n", |
| 1113 | crd->crd_len, olen); |
| 1114 | if (swcr_fail_if_compression_grows) |
| 1115 | ret = ERANGE; |
| 1116 | } |
| 1117 | } else { /* decompress */ |
| 1118 | ret = crypto_comp_decompress(crypto_comp_cast(sw->sw_tfm), |
| 1119 | ibuf, ilen, obuf, &olen); |
| 1120 | if (!ret && (olen + crd->crd_inject) > crp->crp_olen) { |
| 1121 | dprintk("cryptosoft: ETOOSMALL decompress %d into %d, " |
| 1122 | "space for %d,at offset %d\n", |
| 1123 | crd->crd_len, olen, crp->crp_olen, crd->crd_inject); |
| 1124 | ret = ETOOSMALL; |
| 1125 | } |
| 1126 | } |
| 1127 | if (ret) |
| 1128 | dprintk("%s,%d: ret = %d\n", __FILE__, __LINE__, ret); |
| 1129 | |
| 1130 | /* |
| 1131 | * on success copy result back, |
| 1132 | * linux crpyto API returns -errno, we need to fix that |
| 1133 | */ |
| 1134 | crp->crp_etype = ret < 0 ? -ret : ret; |
| 1135 | if (ret == 0) { |
| 1136 | /* copy back the result and return it's size */ |
| 1137 | crypto_copyback(crp->crp_flags, crp->crp_buf, |
| 1138 | crd->crd_inject, olen, obuf); |
| 1139 | crp->crp_olen = olen; |
| 1140 | } |
| 1141 | } break; |
| 1142 | |
| 1143 | default: |
| 1144 | /* Unknown/unsupported algorithm */ |
| 1145 | dprintk("%s,%d: EINVAL\n", __FILE__, __LINE__); |
| 1146 | crp->crp_etype = EINVAL; |
| 1147 | goto done; |
| 1148 | } |
| 1149 | |
| 1150 | done: |
| 1151 | swcr_process_req_complete(req); |
| 1152 | } |
| 1153 | |
| 1154 | |
| 1155 | /* |
| 1156 | * Process a crypto request. |
| 1157 | */ |
| 1158 | static int |
| 1159 | swcr_process(device_t dev, struct cryptop *crp, int hint) |
| 1160 | { |
| 1161 | struct swcr_req *req = NULL; |
| 1162 | u_int32_t lid; |
| 1163 | |
| 1164 | dprintk("%s()\n", __FUNCTION__); |
| 1165 | /* Sanity check */ |
| 1166 | if (crp == NULL) { |
| 1167 | dprintk("%s,%d: EINVAL\n", __FILE__, __LINE__); |
| 1168 | return EINVAL; |
| 1169 | } |
| 1170 | |
| 1171 | crp->crp_etype = 0; |
| 1172 | |
| 1173 | if (crp->crp_desc == NULL || crp->crp_buf == NULL) { |
| 1174 | dprintk("%s,%d: EINVAL\n", __FILE__, __LINE__); |
| 1175 | crp->crp_etype = EINVAL; |
| 1176 | goto done; |
| 1177 | } |
| 1178 | |
| 1179 | lid = crp->crp_sid & 0xffffffff; |
| 1180 | if (lid >= swcr_sesnum || lid == 0 || swcr_sessions == NULL || |
| 1181 | swcr_sessions[lid] == NULL) { |
| 1182 | crp->crp_etype = ENOENT; |
| 1183 | dprintk("%s,%d: ENOENT\n", __FILE__, __LINE__); |
| 1184 | goto done; |
| 1185 | } |
| 1186 | |
| 1187 | /* |
| 1188 | * do some error checking outside of the loop for SKB and IOV processing |
| 1189 | * this leaves us with valid skb or uiop pointers for later |
| 1190 | */ |
| 1191 | if (crp->crp_flags & CRYPTO_F_SKBUF) { |
| 1192 | struct sk_buff *skb = (struct sk_buff *) crp->crp_buf; |
| 1193 | if (skb_shinfo(skb)->nr_frags >= SCATTERLIST_MAX) { |
| 1194 | printk("%s,%d: %d nr_frags > SCATTERLIST_MAX", __FILE__, __LINE__, |
| 1195 | skb_shinfo(skb)->nr_frags); |
| 1196 | goto done; |
| 1197 | } |
| 1198 | } else if (crp->crp_flags & CRYPTO_F_IOV) { |
| 1199 | struct uio *uiop = (struct uio *) crp->crp_buf; |
| 1200 | if (uiop->uio_iovcnt > SCATTERLIST_MAX) { |
| 1201 | printk("%s,%d: %d uio_iovcnt > SCATTERLIST_MAX", __FILE__, __LINE__, |
| 1202 | uiop->uio_iovcnt); |
| 1203 | goto done; |
| 1204 | } |
| 1205 | } |
| 1206 | |
| 1207 | /* |
| 1208 | * setup a new request ready for queuing |
| 1209 | */ |
| 1210 | req = kmem_cache_alloc(swcr_req_cache, SLAB_ATOMIC); |
| 1211 | if (req == NULL) { |
| 1212 | dprintk("%s,%d: ENOMEM\n", __FILE__, __LINE__); |
| 1213 | crp->crp_etype = ENOMEM; |
| 1214 | goto done; |
| 1215 | } |
| 1216 | memset(req, 0, sizeof(*req)); |
| 1217 | |
| 1218 | req->sw_head = swcr_sessions[lid]; |
| 1219 | req->crp = crp; |
| 1220 | req->crd = crp->crp_desc; |
| 1221 | |
| 1222 | swcr_process_req(req); |
| 1223 | return 0; |
| 1224 | |
| 1225 | done: |
| 1226 | crypto_done(crp); |
| 1227 | if (req) |
| 1228 | kmem_cache_free(swcr_req_cache, req); |
| 1229 | return 0; |
| 1230 | } |
| 1231 | |
| 1232 | |
| 1233 | static int |
| 1234 | cryptosoft_init(void) |
| 1235 | { |
| 1236 | int i, sw_type, mode; |
| 1237 | char *algo; |
| 1238 | |
| 1239 | dprintk("%s(%p)\n", __FUNCTION__, cryptosoft_init); |
| 1240 | |
| 1241 | swcr_req_cache = kmem_cache_create("cryptosoft_req", |
| 1242 | sizeof(struct swcr_req), 0, SLAB_HWCACHE_ALIGN, NULL |
| 1243 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23) |
| 1244 | , NULL |
| 1245 | #endif |
| 1246 | ); |
| 1247 | if (!swcr_req_cache) { |
| 1248 | printk("cryptosoft: failed to create request cache\n"); |
| 1249 | return -ENOENT; |
| 1250 | } |
| 1251 | |
| 1252 | softc_device_init(&swcr_softc, "cryptosoft", 0, swcr_methods); |
| 1253 | |
| 1254 | swcr_id = crypto_get_driverid(softc_get_device(&swcr_softc), |
| 1255 | CRYPTOCAP_F_SOFTWARE | CRYPTOCAP_F_SYNC); |
| 1256 | if (swcr_id < 0) { |
| 1257 | printk("cryptosoft: Software crypto device cannot initialize!"); |
| 1258 | return -ENODEV; |
| 1259 | } |
| 1260 | |
| 1261 | #define REGISTER(alg) \ |
| 1262 | crypto_register(swcr_id, alg, 0,0) |
| 1263 | |
| 1264 | for (i = 0; i < sizeof(crypto_details)/sizeof(crypto_details[0]); i++) { |
| 1265 | int found; |
| 1266 | |
| 1267 | algo = crypto_details[i].alg_name; |
| 1268 | if (!algo || !*algo) { |
| 1269 | dprintk("%s:Algorithm %d not supported\n", __FUNCTION__, i); |
| 1270 | continue; |
| 1271 | } |
| 1272 | |
| 1273 | mode = crypto_details[i].mode; |
| 1274 | sw_type = crypto_details[i].sw_type; |
| 1275 | |
| 1276 | found = 0; |
| 1277 | switch (sw_type & SW_TYPE_ALG_MASK) { |
| 1278 | case SW_TYPE_CIPHER: |
| 1279 | found = crypto_has_cipher(algo, 0, CRYPTO_ALG_ASYNC); |
| 1280 | break; |
| 1281 | case SW_TYPE_HMAC: |
| 1282 | found = crypto_has_hash(algo, 0, swcr_no_ahash?CRYPTO_ALG_ASYNC:0); |
| 1283 | break; |
| 1284 | case SW_TYPE_HASH: |
| 1285 | found = crypto_has_hash(algo, 0, swcr_no_ahash?CRYPTO_ALG_ASYNC:0); |
| 1286 | break; |
| 1287 | case SW_TYPE_COMP: |
| 1288 | found = crypto_has_comp(algo, 0, CRYPTO_ALG_ASYNC); |
| 1289 | break; |
| 1290 | case SW_TYPE_BLKCIPHER: |
| 1291 | found = crypto_has_blkcipher(algo, 0, CRYPTO_ALG_ASYNC); |
| 1292 | if (!found && !swcr_no_ablk) |
| 1293 | found = crypto_has_ablkcipher(algo, 0, 0); |
| 1294 | break; |
| 1295 | } |
| 1296 | if (found) { |
| 1297 | REGISTER(i); |
| 1298 | } else { |
| 1299 | dprintk("%s:Algorithm Type %d not supported (algorithm %d:'%s')\n", |
| 1300 | __FUNCTION__, sw_type, i, algo); |
| 1301 | } |
| 1302 | } |
| 1303 | return 0; |
| 1304 | } |
| 1305 | |
| 1306 | static void |
| 1307 | cryptosoft_exit(void) |
| 1308 | { |
| 1309 | dprintk("%s()\n", __FUNCTION__); |
| 1310 | crypto_unregister_all(swcr_id); |
| 1311 | swcr_id = -1; |
| 1312 | kmem_cache_destroy(swcr_req_cache); |
| 1313 | } |
| 1314 | |
| 1315 | late_initcall(cryptosoft_init); |
| 1316 | module_exit(cryptosoft_exit); |
| 1317 | |
| 1318 | MODULE_LICENSE("Dual BSD/GPL"); |
| 1319 | MODULE_AUTHOR("David McCullough <david_mccullough@mcafee.com>"); |
| 1320 | MODULE_DESCRIPTION("Cryptosoft (OCF module for kernel crypto)"); |
| 1321 | |
