| 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@securecomputing.com> |
| 7 | * Copyright (C) 2004-2007 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 | #ifndef AUTOCONF_INCLUDED |
| 38 | #include <linux/config.h> |
| 39 | #endif |
| 40 | #include <linux/module.h> |
| 41 | #include <linux/init.h> |
| 42 | #include <linux/list.h> |
| 43 | #include <linux/slab.h> |
| 44 | #include <linux/sched.h> |
| 45 | #include <linux/wait.h> |
| 46 | #include <linux/crypto.h> |
| 47 | #include <linux/mm.h> |
| 48 | #include <linux/skbuff.h> |
| 49 | #include <linux/random.h> |
| 50 | #include <asm/scatterlist.h> |
| 51 | |
| 52 | #include <cryptodev.h> |
| 53 | #include <uio.h> |
| 54 | |
| 55 | struct { |
| 56 | softc_device_decl sc_dev; |
| 57 | } swcr_softc; |
| 58 | |
| 59 | #define offset_in_page(p) ((unsigned long)(p) & ~PAGE_MASK) |
| 60 | |
| 61 | /* Software session entry */ |
| 62 | |
| 63 | #define SW_TYPE_CIPHER 0 |
| 64 | #define SW_TYPE_HMAC 1 |
| 65 | #define SW_TYPE_AUTH2 2 |
| 66 | #define SW_TYPE_HASH 3 |
| 67 | #define SW_TYPE_COMP 4 |
| 68 | #define SW_TYPE_BLKCIPHER 5 |
| 69 | |
| 70 | struct swcr_data { |
| 71 | int sw_type; |
| 72 | int sw_alg; |
| 73 | struct crypto_tfm *sw_tfm; |
| 74 | union { |
| 75 | struct { |
| 76 | char *sw_key; |
| 77 | int sw_klen; |
| 78 | int sw_mlen; |
| 79 | } hmac; |
| 80 | void *sw_comp_buf; |
| 81 | } u; |
| 82 | struct swcr_data *sw_next; |
| 83 | }; |
| 84 | |
| 85 | #ifndef CRYPTO_TFM_MODE_CBC |
| 86 | /* |
| 87 | * As of linux-2.6.21 this is no longer defined, and presumably no longer |
| 88 | * needed to be passed into the crypto core code. |
| 89 | */ |
| 90 | #define CRYPTO_TFM_MODE_CBC 0 |
| 91 | #define CRYPTO_TFM_MODE_ECB 0 |
| 92 | #endif |
| 93 | |
| 94 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19) |
| 95 | /* |
| 96 | * Linux 2.6.19 introduced a new Crypto API, setup macro's to convert new |
| 97 | * API into old API. |
| 98 | */ |
| 99 | |
| 100 | /* Symmetric/Block Cipher */ |
| 101 | struct blkcipher_desc |
| 102 | { |
| 103 | struct crypto_tfm *tfm; |
| 104 | void *info; |
| 105 | }; |
| 106 | #define ecb(X) #X |
| 107 | #define cbc(X) #X |
| 108 | #define crypto_has_blkcipher(X, Y, Z) crypto_alg_available(X, 0) |
| 109 | #define crypto_blkcipher_cast(X) X |
| 110 | #define crypto_blkcipher_tfm(X) X |
| 111 | #define crypto_alloc_blkcipher(X, Y, Z) crypto_alloc_tfm(X, mode) |
| 112 | #define crypto_blkcipher_ivsize(X) crypto_tfm_alg_ivsize(X) |
| 113 | #define crypto_blkcipher_blocksize(X) crypto_tfm_alg_blocksize(X) |
| 114 | #define crypto_blkcipher_setkey(X, Y, Z) crypto_cipher_setkey(X, Y, Z) |
| 115 | #define crypto_blkcipher_encrypt_iv(W, X, Y, Z) \ |
| 116 | crypto_cipher_encrypt_iv((W)->tfm, X, Y, Z, (u8 *)((W)->info)) |
| 117 | #define crypto_blkcipher_decrypt_iv(W, X, Y, Z) \ |
| 118 | crypto_cipher_decrypt_iv((W)->tfm, X, Y, Z, (u8 *)((W)->info)) |
| 119 | |
| 120 | /* Hash/HMAC/Digest */ |
| 121 | struct hash_desc |
| 122 | { |
| 123 | struct crypto_tfm *tfm; |
| 124 | }; |
| 125 | #define hmac(X) #X |
| 126 | #define crypto_has_hash(X, Y, Z) crypto_alg_available(X, 0) |
| 127 | #define crypto_hash_cast(X) X |
| 128 | #define crypto_hash_tfm(X) X |
| 129 | #define crypto_alloc_hash(X, Y, Z) crypto_alloc_tfm(X, mode) |
| 130 | #define crypto_hash_digestsize(X) crypto_tfm_alg_digestsize(X) |
| 131 | #define crypto_hash_digest(W, X, Y, Z) \ |
| 132 | crypto_digest_digest((W)->tfm, X, sg_num, Z) |
| 133 | |
| 134 | /* Asymmetric Cipher */ |
| 135 | #define crypto_has_cipher(X, Y, Z) crypto_alg_available(X, 0) |
| 136 | |
| 137 | /* Compression */ |
| 138 | #define crypto_has_comp(X, Y, Z) crypto_alg_available(X, 0) |
| 139 | #define crypto_comp_tfm(X) X |
| 140 | #define crypto_comp_cast(X) X |
| 141 | #define crypto_alloc_comp(X, Y, Z) crypto_alloc_tfm(X, mode) |
| 142 | #else |
| 143 | #define ecb(X) "ecb(" #X ")" |
| 144 | #define cbc(X) "cbc(" #X ")" |
| 145 | #define hmac(X) "hmac(" #X ")" |
| 146 | #endif /* if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19) */ |
| 147 | |
| 148 | struct crypto_details |
| 149 | { |
| 150 | char *alg_name; |
| 151 | int mode; |
| 152 | int sw_type; |
| 153 | }; |
| 154 | |
| 155 | /* |
| 156 | * This needs to be kept updated with CRYPTO_xxx list (cryptodev.h). |
| 157 | * If the Algorithm is not supported, then insert a {NULL, 0, 0} entry. |
| 158 | * |
| 159 | * IMPORTANT: The index to the array IS CRYPTO_xxx. |
| 160 | */ |
| 161 | static struct crypto_details crypto_details[CRYPTO_ALGORITHM_MAX + 1] = { |
| 162 | { NULL, 0, 0 }, |
| 163 | /* CRYPTO_xxx index starts at 1 */ |
| 164 | { cbc(des), CRYPTO_TFM_MODE_CBC, SW_TYPE_BLKCIPHER }, |
| 165 | { cbc(des3_ede), CRYPTO_TFM_MODE_CBC, SW_TYPE_BLKCIPHER }, |
| 166 | { cbc(blowfish), CRYPTO_TFM_MODE_CBC, SW_TYPE_BLKCIPHER }, |
| 167 | { cbc(cast5), CRYPTO_TFM_MODE_CBC, SW_TYPE_BLKCIPHER }, |
| 168 | { cbc(skipjack), CRYPTO_TFM_MODE_CBC, SW_TYPE_BLKCIPHER }, |
| 169 | { hmac(md5), 0, SW_TYPE_HMAC }, |
| 170 | { hmac(sha1), 0, SW_TYPE_HMAC }, |
| 171 | { hmac(ripemd160), 0, SW_TYPE_HMAC }, |
| 172 | { "md5-kpdk??", 0, SW_TYPE_HASH }, |
| 173 | { "sha1-kpdk??", 0, SW_TYPE_HASH }, |
| 174 | { cbc(aes), CRYPTO_TFM_MODE_CBC, SW_TYPE_BLKCIPHER }, |
| 175 | { ecb(arc4), CRYPTO_TFM_MODE_ECB, SW_TYPE_BLKCIPHER }, |
| 176 | { "md5", 0, SW_TYPE_HASH }, |
| 177 | { "sha1", 0, SW_TYPE_HASH }, |
| 178 | { hmac(digest_null), 0, SW_TYPE_HMAC }, |
| 179 | { cbc(cipher_null), CRYPTO_TFM_MODE_CBC, SW_TYPE_BLKCIPHER }, |
| 180 | { "deflate", 0, SW_TYPE_COMP }, |
| 181 | { hmac(sha256), 0, SW_TYPE_HMAC }, |
| 182 | { hmac(sha384), 0, SW_TYPE_HMAC }, |
| 183 | { hmac(sha512), 0, SW_TYPE_HMAC }, |
| 184 | { cbc(camellia), CRYPTO_TFM_MODE_CBC, SW_TYPE_BLKCIPHER }, |
| 185 | { "sha256", 0, SW_TYPE_HASH }, |
| 186 | { "sha384", 0, SW_TYPE_HASH }, |
| 187 | { "sha512", 0, SW_TYPE_HASH }, |
| 188 | { "ripemd160", 0, SW_TYPE_HASH }, |
| 189 | }; |
| 190 | |
| 191 | int32_t swcr_id = -1; |
| 192 | module_param(swcr_id, int, 0444); |
| 193 | MODULE_PARM_DESC(swcr_id, "Read-Only OCF ID for cryptosoft driver"); |
| 194 | |
| 195 | int swcr_fail_if_compression_grows = 1; |
| 196 | module_param(swcr_fail_if_compression_grows, int, 0644); |
| 197 | MODULE_PARM_DESC(swcr_fail_if_compression_grows, |
| 198 | "Treat compression that results in more data as a failure"); |
| 199 | |
| 200 | static struct swcr_data **swcr_sessions = NULL; |
| 201 | static u_int32_t swcr_sesnum = 0; |
| 202 | |
| 203 | static int swcr_process(device_t, struct cryptop *, int); |
| 204 | static int swcr_newsession(device_t, u_int32_t *, struct cryptoini *); |
| 205 | static int swcr_freesession(device_t, u_int64_t); |
| 206 | |
| 207 | static device_method_t swcr_methods = { |
| 208 | /* crypto device methods */ |
| 209 | DEVMETHOD(cryptodev_newsession, swcr_newsession), |
| 210 | DEVMETHOD(cryptodev_freesession,swcr_freesession), |
| 211 | DEVMETHOD(cryptodev_process, swcr_process), |
| 212 | }; |
| 213 | |
| 214 | #define debug swcr_debug |
| 215 | int swcr_debug = 0; |
| 216 | module_param(swcr_debug, int, 0644); |
| 217 | MODULE_PARM_DESC(swcr_debug, "Enable debug"); |
| 218 | |
| 219 | /* |
| 220 | * Generate a new software session. |
| 221 | */ |
| 222 | static int |
| 223 | swcr_newsession(device_t dev, u_int32_t *sid, struct cryptoini *cri) |
| 224 | { |
| 225 | struct swcr_data **swd; |
| 226 | u_int32_t i; |
| 227 | int error; |
| 228 | char *algo; |
| 229 | int mode, sw_type; |
| 230 | |
| 231 | dprintk("%s()\n", __FUNCTION__); |
| 232 | if (sid == NULL || cri == NULL) { |
| 233 | dprintk("%s,%d - EINVAL\n", __FILE__, __LINE__); |
| 234 | return EINVAL; |
| 235 | } |
| 236 | |
| 237 | if (swcr_sessions) { |
| 238 | for (i = 1; i < swcr_sesnum; i++) |
| 239 | if (swcr_sessions[i] == NULL) |
| 240 | break; |
| 241 | } else |
| 242 | i = 1; /* NB: to silence compiler warning */ |
| 243 | |
| 244 | if (swcr_sessions == NULL || i == swcr_sesnum) { |
| 245 | if (swcr_sessions == NULL) { |
| 246 | i = 1; /* We leave swcr_sessions[0] empty */ |
| 247 | swcr_sesnum = CRYPTO_SW_SESSIONS; |
| 248 | } else |
| 249 | swcr_sesnum *= 2; |
| 250 | |
| 251 | swd = kmalloc(swcr_sesnum * sizeof(struct swcr_data *), SLAB_ATOMIC); |
| 252 | if (swd == NULL) { |
| 253 | /* Reset session number */ |
| 254 | if (swcr_sesnum == CRYPTO_SW_SESSIONS) |
| 255 | swcr_sesnum = 0; |
| 256 | else |
| 257 | swcr_sesnum /= 2; |
| 258 | dprintk("%s,%d: ENOBUFS\n", __FILE__, __LINE__); |
| 259 | return ENOBUFS; |
| 260 | } |
| 261 | memset(swd, 0, swcr_sesnum * sizeof(struct swcr_data *)); |
| 262 | |
| 263 | /* Copy existing sessions */ |
| 264 | if (swcr_sessions) { |
| 265 | memcpy(swd, swcr_sessions, |
| 266 | (swcr_sesnum / 2) * sizeof(struct swcr_data *)); |
| 267 | kfree(swcr_sessions); |
| 268 | } |
| 269 | |
| 270 | swcr_sessions = swd; |
| 271 | } |
| 272 | |
| 273 | swd = &swcr_sessions[i]; |
| 274 | *sid = i; |
| 275 | |
| 276 | while (cri) { |
| 277 | *swd = (struct swcr_data *) kmalloc(sizeof(struct swcr_data), |
| 278 | SLAB_ATOMIC); |
| 279 | if (*swd == NULL) { |
| 280 | swcr_freesession(NULL, i); |
| 281 | dprintk("%s,%d: ENOBUFS\n", __FILE__, __LINE__); |
| 282 | return ENOBUFS; |
| 283 | } |
| 284 | memset(*swd, 0, sizeof(struct swcr_data)); |
| 285 | |
| 286 | if (cri->cri_alg > CRYPTO_ALGORITHM_MAX) { |
| 287 | printk("cryptosoft: Unknown algorithm 0x%x\n", cri->cri_alg); |
| 288 | swcr_freesession(NULL, i); |
| 289 | return EINVAL; |
| 290 | } |
| 291 | |
| 292 | algo = crypto_details[cri->cri_alg].alg_name; |
| 293 | if (!algo || !*algo) { |
| 294 | printk("cryptosoft: Unsupported algorithm 0x%x\n", cri->cri_alg); |
| 295 | swcr_freesession(NULL, i); |
| 296 | return EINVAL; |
| 297 | } |
| 298 | |
| 299 | mode = crypto_details[cri->cri_alg].mode; |
| 300 | sw_type = crypto_details[cri->cri_alg].sw_type; |
| 301 | |
| 302 | /* Algorithm specific configuration */ |
| 303 | switch (cri->cri_alg) { |
| 304 | case CRYPTO_NULL_CBC: |
| 305 | cri->cri_klen = 0; /* make it work with crypto API */ |
| 306 | break; |
| 307 | default: |
| 308 | break; |
| 309 | } |
| 310 | |
| 311 | if (sw_type == SW_TYPE_BLKCIPHER) { |
| 312 | dprintk("%s crypto_alloc_blkcipher(%s, 0x%x)\n", __FUNCTION__, |
| 313 | algo, mode); |
| 314 | |
| 315 | (*swd)->sw_tfm = crypto_blkcipher_tfm( |
| 316 | crypto_alloc_blkcipher(algo, 0, |
| 317 | CRYPTO_ALG_ASYNC)); |
| 318 | if (!(*swd)->sw_tfm) { |
| 319 | dprintk("cryptosoft: crypto_alloc_blkcipher failed(%s,0x%x)\n", |
| 320 | algo,mode); |
| 321 | swcr_freesession(NULL, i); |
| 322 | return EINVAL; |
| 323 | } |
| 324 | |
| 325 | if (debug) { |
| 326 | dprintk("%s key:cri->cri_klen=%d,(cri->cri_klen + 7)/8=%d", |
| 327 | __FUNCTION__,cri->cri_klen,(cri->cri_klen + 7)/8); |
| 328 | for (i = 0; i < (cri->cri_klen + 7) / 8; i++) |
| 329 | { |
| 330 | dprintk("%s0x%x", (i % 8) ? " " : "\n ",cri->cri_key[i]); |
| 331 | } |
| 332 | dprintk("\n"); |
| 333 | } |
| 334 | error = crypto_blkcipher_setkey( |
| 335 | crypto_blkcipher_cast((*swd)->sw_tfm), cri->cri_key, |
| 336 | (cri->cri_klen + 7) / 8); |
| 337 | if (error) { |
| 338 | printk("cryptosoft: setkey failed %d (crt_flags=0x%x)\n", error, |
| 339 | (*swd)->sw_tfm->crt_flags); |
| 340 | swcr_freesession(NULL, i); |
| 341 | return error; |
| 342 | } |
| 343 | } else if (sw_type == SW_TYPE_HMAC || sw_type == SW_TYPE_HASH) { |
| 344 | dprintk("%s crypto_alloc_hash(%s, 0x%x)\n", __FUNCTION__, |
| 345 | algo, mode); |
| 346 | |
| 347 | (*swd)->sw_tfm = crypto_hash_tfm( |
| 348 | crypto_alloc_hash(algo, 0, CRYPTO_ALG_ASYNC)); |
| 349 | |
| 350 | if (!(*swd)->sw_tfm) { |
| 351 | dprintk("cryptosoft: crypto_alloc_hash failed(%s,0x%x)\n", |
| 352 | algo, mode); |
| 353 | swcr_freesession(NULL, i); |
| 354 | return EINVAL; |
| 355 | } |
| 356 | |
| 357 | (*swd)->u.hmac.sw_klen = (cri->cri_klen + 7) / 8; |
| 358 | (*swd)->u.hmac.sw_key = (char *)kmalloc((*swd)->u.hmac.sw_klen, |
| 359 | SLAB_ATOMIC); |
| 360 | if ((*swd)->u.hmac.sw_key == NULL) { |
| 361 | swcr_freesession(NULL, i); |
| 362 | dprintk("%s,%d: ENOBUFS\n", __FILE__, __LINE__); |
| 363 | return ENOBUFS; |
| 364 | } |
| 365 | memcpy((*swd)->u.hmac.sw_key, cri->cri_key, (*swd)->u.hmac.sw_klen); |
| 366 | if (cri->cri_mlen) { |
| 367 | (*swd)->u.hmac.sw_mlen = cri->cri_mlen; |
| 368 | } else { |
| 369 | (*swd)->u.hmac.sw_mlen = |
| 370 | crypto_hash_digestsize( |
| 371 | crypto_hash_cast((*swd)->sw_tfm)); |
| 372 | } |
| 373 | } else if (sw_type == SW_TYPE_COMP) { |
| 374 | (*swd)->sw_tfm = crypto_comp_tfm( |
| 375 | crypto_alloc_comp(algo, 0, CRYPTO_ALG_ASYNC)); |
| 376 | if (!(*swd)->sw_tfm) { |
| 377 | dprintk("cryptosoft: crypto_alloc_comp failed(%s,0x%x)\n", |
| 378 | algo, mode); |
| 379 | swcr_freesession(NULL, i); |
| 380 | return EINVAL; |
| 381 | } |
| 382 | (*swd)->u.sw_comp_buf = kmalloc(CRYPTO_MAX_DATA_LEN, SLAB_ATOMIC); |
| 383 | if ((*swd)->u.sw_comp_buf == NULL) { |
| 384 | swcr_freesession(NULL, i); |
| 385 | dprintk("%s,%d: ENOBUFS\n", __FILE__, __LINE__); |
| 386 | return ENOBUFS; |
| 387 | } |
| 388 | } else { |
| 389 | printk("cryptosoft: Unhandled sw_type %d\n", sw_type); |
| 390 | swcr_freesession(NULL, i); |
| 391 | return EINVAL; |
| 392 | } |
| 393 | |
| 394 | (*swd)->sw_alg = cri->cri_alg; |
| 395 | (*swd)->sw_type = sw_type; |
| 396 | |
| 397 | cri = cri->cri_next; |
| 398 | swd = &((*swd)->sw_next); |
| 399 | } |
| 400 | return 0; |
| 401 | } |
| 402 | |
| 403 | /* |
| 404 | * Free a session. |
| 405 | */ |
| 406 | static int |
| 407 | swcr_freesession(device_t dev, u_int64_t tid) |
| 408 | { |
| 409 | struct swcr_data *swd; |
| 410 | u_int32_t sid = CRYPTO_SESID2LID(tid); |
| 411 | |
| 412 | dprintk("%s()\n", __FUNCTION__); |
| 413 | if (sid > swcr_sesnum || swcr_sessions == NULL || |
| 414 | swcr_sessions[sid] == NULL) { |
| 415 | dprintk("%s,%d: EINVAL\n", __FILE__, __LINE__); |
| 416 | return(EINVAL); |
| 417 | } |
| 418 | |
| 419 | /* Silently accept and return */ |
| 420 | if (sid == 0) |
| 421 | return(0); |
| 422 | |
| 423 | while ((swd = swcr_sessions[sid]) != NULL) { |
| 424 | swcr_sessions[sid] = swd->sw_next; |
| 425 | if (swd->sw_tfm) |
| 426 | crypto_free_tfm(swd->sw_tfm); |
| 427 | if (swd->sw_type == SW_TYPE_COMP) { |
| 428 | if (swd->u.sw_comp_buf) |
| 429 | kfree(swd->u.sw_comp_buf); |
| 430 | } else { |
| 431 | if (swd->u.hmac.sw_key) |
| 432 | kfree(swd->u.hmac.sw_key); |
| 433 | } |
| 434 | kfree(swd); |
| 435 | } |
| 436 | return 0; |
| 437 | } |
| 438 | |
| 439 | /* |
| 440 | * Process a software request. |
| 441 | */ |
| 442 | static int |
| 443 | swcr_process(device_t dev, struct cryptop *crp, int hint) |
| 444 | { |
| 445 | struct cryptodesc *crd; |
| 446 | struct swcr_data *sw; |
| 447 | u_int32_t lid; |
| 448 | #define SCATTERLIST_MAX 16 |
| 449 | struct scatterlist sg[SCATTERLIST_MAX]; |
| 450 | int sg_num, sg_len, skip; |
| 451 | struct sk_buff *skb = NULL; |
| 452 | struct uio *uiop = NULL; |
| 453 | |
| 454 | dprintk("%s()\n", __FUNCTION__); |
| 455 | /* Sanity check */ |
| 456 | if (crp == NULL) { |
| 457 | dprintk("%s,%d: EINVAL\n", __FILE__, __LINE__); |
| 458 | return EINVAL; |
| 459 | } |
| 460 | |
| 461 | crp->crp_etype = 0; |
| 462 | |
| 463 | if (crp->crp_desc == NULL || crp->crp_buf == NULL) { |
| 464 | dprintk("%s,%d: EINVAL\n", __FILE__, __LINE__); |
| 465 | crp->crp_etype = EINVAL; |
| 466 | goto done; |
| 467 | } |
| 468 | |
| 469 | lid = crp->crp_sid & 0xffffffff; |
| 470 | if (lid >= swcr_sesnum || lid == 0 || swcr_sessions == NULL || |
| 471 | swcr_sessions[lid] == NULL) { |
| 472 | crp->crp_etype = ENOENT; |
| 473 | dprintk("%s,%d: ENOENT\n", __FILE__, __LINE__); |
| 474 | goto done; |
| 475 | } |
| 476 | |
| 477 | /* |
| 478 | * do some error checking outside of the loop for SKB and IOV processing |
| 479 | * this leaves us with valid skb or uiop pointers for later |
| 480 | */ |
| 481 | if (crp->crp_flags & CRYPTO_F_SKBUF) { |
| 482 | skb = (struct sk_buff *) crp->crp_buf; |
| 483 | if (skb_shinfo(skb)->nr_frags >= SCATTERLIST_MAX) { |
| 484 | printk("%s,%d: %d nr_frags > SCATTERLIST_MAX", __FILE__, __LINE__, |
| 485 | skb_shinfo(skb)->nr_frags); |
| 486 | goto done; |
| 487 | } |
| 488 | } else if (crp->crp_flags & CRYPTO_F_IOV) { |
| 489 | uiop = (struct uio *) crp->crp_buf; |
| 490 | if (uiop->uio_iovcnt > SCATTERLIST_MAX) { |
| 491 | printk("%s,%d: %d uio_iovcnt > SCATTERLIST_MAX", __FILE__, __LINE__, |
| 492 | uiop->uio_iovcnt); |
| 493 | goto done; |
| 494 | } |
| 495 | } |
| 496 | |
| 497 | /* Go through crypto descriptors, processing as we go */ |
| 498 | for (crd = crp->crp_desc; crd; crd = crd->crd_next) { |
| 499 | /* |
| 500 | * Find the crypto context. |
| 501 | * |
| 502 | * XXX Note that the logic here prevents us from having |
| 503 | * XXX the same algorithm multiple times in a session |
| 504 | * XXX (or rather, we can but it won't give us the right |
| 505 | * XXX results). To do that, we'd need some way of differentiating |
| 506 | * XXX between the various instances of an algorithm (so we can |
| 507 | * XXX locate the correct crypto context). |
| 508 | */ |
| 509 | for (sw = swcr_sessions[lid]; sw && sw->sw_alg != crd->crd_alg; |
| 510 | sw = sw->sw_next) |
| 511 | ; |
| 512 | |
| 513 | /* No such context ? */ |
| 514 | if (sw == NULL) { |
| 515 | crp->crp_etype = EINVAL; |
| 516 | dprintk("%s,%d: EINVAL\n", __FILE__, __LINE__); |
| 517 | goto done; |
| 518 | } |
| 519 | |
| 520 | skip = crd->crd_skip; |
| 521 | |
| 522 | /* |
| 523 | * setup the SG list skip from the start of the buffer |
| 524 | */ |
| 525 | memset(sg, 0, sizeof(sg)); |
| 526 | if (crp->crp_flags & CRYPTO_F_SKBUF) { |
| 527 | int i, len; |
| 528 | |
| 529 | sg_num = 0; |
| 530 | sg_len = 0; |
| 531 | |
| 532 | if (skip < skb_headlen(skb)) { |
| 533 | len = skb_headlen(skb) - skip; |
| 534 | if (len + sg_len > crd->crd_len) |
| 535 | len = crd->crd_len - sg_len; |
| 536 | sg_set_page(&sg[sg_num], |
| 537 | virt_to_page(skb->data + skip), len, |
| 538 | offset_in_page(skb->data + skip)); |
| 539 | sg_len += len; |
| 540 | sg_num++; |
| 541 | skip = 0; |
| 542 | } else |
| 543 | skip -= skb_headlen(skb); |
| 544 | |
| 545 | for (i = 0; sg_len < crd->crd_len && |
| 546 | i < skb_shinfo(skb)->nr_frags && |
| 547 | sg_num < SCATTERLIST_MAX; i++) { |
| 548 | if (skip < skb_shinfo(skb)->frags[i].size) { |
| 549 | len = skb_shinfo(skb)->frags[i].size - skip; |
| 550 | if (len + sg_len > crd->crd_len) |
| 551 | len = crd->crd_len - sg_len; |
| 552 | sg_set_page(&sg[sg_num], |
| 553 | skb_shinfo(skb)->frags[i].page, |
| 554 | len, |
| 555 | skb_shinfo(skb)->frags[i].page_offset + skip); |
| 556 | sg_len += len; |
| 557 | sg_num++; |
| 558 | skip = 0; |
| 559 | } else |
| 560 | skip -= skb_shinfo(skb)->frags[i].size; |
| 561 | } |
| 562 | } else if (crp->crp_flags & CRYPTO_F_IOV) { |
| 563 | int len; |
| 564 | |
| 565 | sg_len = 0; |
| 566 | for (sg_num = 0; sg_len <= crd->crd_len && |
| 567 | sg_num < uiop->uio_iovcnt && |
| 568 | sg_num < SCATTERLIST_MAX; sg_num++) { |
| 569 | if (skip <= uiop->uio_iov[sg_num].iov_len) { |
| 570 | len = uiop->uio_iov[sg_num].iov_len - skip; |
| 571 | if (len + sg_len > crd->crd_len) |
| 572 | len = crd->crd_len - sg_len; |
| 573 | sg_set_page(&sg[sg_num], |
| 574 | virt_to_page(uiop->uio_iov[sg_num].iov_base+skip), |
| 575 | len, |
| 576 | offset_in_page(uiop->uio_iov[sg_num].iov_base+skip)); |
| 577 | sg_len += len; |
| 578 | skip = 0; |
| 579 | } else |
| 580 | skip -= uiop->uio_iov[sg_num].iov_len; |
| 581 | } |
| 582 | } else { |
| 583 | sg_len = (crp->crp_ilen - skip); |
| 584 | if (sg_len > crd->crd_len) |
| 585 | sg_len = crd->crd_len; |
| 586 | sg_set_page(&sg[0], virt_to_page(crp->crp_buf + skip), |
| 587 | sg_len, offset_in_page(crp->crp_buf + skip)); |
| 588 | sg_num = 1; |
| 589 | } |
| 590 | |
| 591 | |
| 592 | switch (sw->sw_type) { |
| 593 | case SW_TYPE_BLKCIPHER: { |
| 594 | unsigned char iv[EALG_MAX_BLOCK_LEN]; |
| 595 | unsigned char *ivp = iv; |
| 596 | int ivsize = |
| 597 | crypto_blkcipher_ivsize(crypto_blkcipher_cast(sw->sw_tfm)); |
| 598 | struct blkcipher_desc desc; |
| 599 | |
| 600 | if (sg_len < crypto_blkcipher_blocksize( |
| 601 | crypto_blkcipher_cast(sw->sw_tfm))) { |
| 602 | crp->crp_etype = EINVAL; |
| 603 | dprintk("%s,%d: EINVAL len %d < %d\n", __FILE__, __LINE__, |
| 604 | sg_len, crypto_blkcipher_blocksize( |
| 605 | crypto_blkcipher_cast(sw->sw_tfm))); |
| 606 | goto done; |
| 607 | } |
| 608 | |
| 609 | if (ivsize > sizeof(iv)) { |
| 610 | crp->crp_etype = EINVAL; |
| 611 | dprintk("%s,%d: EINVAL\n", __FILE__, __LINE__); |
| 612 | goto done; |
| 613 | } |
| 614 | |
| 615 | if (crd->crd_flags & CRD_F_KEY_EXPLICIT) { |
| 616 | int i, error; |
| 617 | |
| 618 | if (debug) { |
| 619 | dprintk("%s key:", __FUNCTION__); |
| 620 | for (i = 0; i < (crd->crd_klen + 7) / 8; i++) |
| 621 | dprintk("%s0x%x", (i % 8) ? " " : "\n ", |
| 622 | crd->crd_key[i]); |
| 623 | dprintk("\n"); |
| 624 | } |
| 625 | error = crypto_blkcipher_setkey( |
| 626 | crypto_blkcipher_cast(sw->sw_tfm), crd->crd_key, |
| 627 | (crd->crd_klen + 7) / 8); |
| 628 | if (error) { |
| 629 | dprintk("cryptosoft: setkey failed %d (crt_flags=0x%x)\n", |
| 630 | error, sw->sw_tfm->crt_flags); |
| 631 | crp->crp_etype = -error; |
| 632 | } |
| 633 | } |
| 634 | |
| 635 | memset(&desc, 0, sizeof(desc)); |
| 636 | desc.tfm = crypto_blkcipher_cast(sw->sw_tfm); |
| 637 | |
| 638 | if (crd->crd_flags & CRD_F_ENCRYPT) { /* encrypt */ |
| 639 | |
| 640 | if (crd->crd_flags & CRD_F_IV_EXPLICIT) { |
| 641 | ivp = crd->crd_iv; |
| 642 | } else { |
| 643 | get_random_bytes(ivp, ivsize); |
| 644 | } |
| 645 | /* |
| 646 | * do we have to copy the IV back to the buffer ? |
| 647 | */ |
| 648 | if ((crd->crd_flags & CRD_F_IV_PRESENT) == 0) { |
| 649 | crypto_copyback(crp->crp_flags, crp->crp_buf, |
| 650 | crd->crd_inject, ivsize, (caddr_t)ivp); |
| 651 | } |
| 652 | desc.info = ivp; |
| 653 | crypto_blkcipher_encrypt_iv(&desc, sg, sg, sg_len); |
| 654 | |
| 655 | } else { /*decrypt */ |
| 656 | |
| 657 | if (crd->crd_flags & CRD_F_IV_EXPLICIT) { |
| 658 | ivp = crd->crd_iv; |
| 659 | } else { |
| 660 | crypto_copydata(crp->crp_flags, crp->crp_buf, |
| 661 | crd->crd_inject, ivsize, (caddr_t)ivp); |
| 662 | } |
| 663 | desc.info = ivp; |
| 664 | crypto_blkcipher_decrypt_iv(&desc, sg, sg, sg_len); |
| 665 | } |
| 666 | } break; |
| 667 | case SW_TYPE_HMAC: |
| 668 | case SW_TYPE_HASH: |
| 669 | { |
| 670 | char result[HASH_MAX_LEN]; |
| 671 | struct hash_desc desc; |
| 672 | |
| 673 | /* check we have room for the result */ |
| 674 | if (crp->crp_ilen - crd->crd_inject < sw->u.hmac.sw_mlen) { |
| 675 | dprintk( |
| 676 | "cryptosoft: EINVAL crp_ilen=%d, len=%d, inject=%d digestsize=%d\n", |
| 677 | crp->crp_ilen, crd->crd_skip + sg_len, crd->crd_inject, |
| 678 | sw->u.hmac.sw_mlen); |
| 679 | crp->crp_etype = EINVAL; |
| 680 | goto done; |
| 681 | } |
| 682 | |
| 683 | memset(&desc, 0, sizeof(desc)); |
| 684 | desc.tfm = crypto_hash_cast(sw->sw_tfm); |
| 685 | |
| 686 | memset(result, 0, sizeof(result)); |
| 687 | |
| 688 | if (sw->sw_type == SW_TYPE_HMAC) { |
| 689 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19) |
| 690 | crypto_hmac(sw->sw_tfm, sw->u.hmac.sw_key, &sw->u.hmac.sw_klen, |
| 691 | sg, sg_num, result); |
| 692 | #else |
| 693 | crypto_hash_setkey(desc.tfm, sw->u.hmac.sw_key, |
| 694 | sw->u.hmac.sw_klen); |
| 695 | crypto_hash_digest(&desc, sg, sg_len, result); |
| 696 | #endif /* #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19) */ |
| 697 | |
| 698 | } else { /* SW_TYPE_HASH */ |
| 699 | crypto_hash_digest(&desc, sg, sg_len, result); |
| 700 | } |
| 701 | |
| 702 | crypto_copyback(crp->crp_flags, crp->crp_buf, |
| 703 | crd->crd_inject, sw->u.hmac.sw_mlen, result); |
| 704 | } |
| 705 | break; |
| 706 | |
| 707 | case SW_TYPE_COMP: { |
| 708 | void *ibuf = NULL; |
| 709 | void *obuf = sw->u.sw_comp_buf; |
| 710 | int ilen = sg_len, olen = CRYPTO_MAX_DATA_LEN; |
| 711 | int ret = 0; |
| 712 | |
| 713 | /* |
| 714 | * we need to use an additional copy if there is more than one |
| 715 | * input chunk since the kernel comp routines do not handle |
| 716 | * SG yet. Otherwise we just use the input buffer as is. |
| 717 | * Rather than allocate another buffer we just split the tmp |
| 718 | * buffer we already have. |
| 719 | * Perhaps we should just use zlib directly ? |
| 720 | */ |
| 721 | if (sg_num > 1) { |
| 722 | int blk; |
| 723 | |
| 724 | ibuf = obuf; |
| 725 | for (blk = 0; blk < sg_num; blk++) { |
| 726 | memcpy(obuf, sg_virt(&sg[blk]), |
| 727 | sg[blk].length); |
| 728 | obuf += sg[blk].length; |
| 729 | } |
| 730 | olen -= sg_len; |
| 731 | } else |
| 732 | ibuf = sg_virt(&sg[0]); |
| 733 | |
| 734 | if (crd->crd_flags & CRD_F_ENCRYPT) { /* compress */ |
| 735 | ret = crypto_comp_compress(crypto_comp_cast(sw->sw_tfm), |
| 736 | ibuf, ilen, obuf, &olen); |
| 737 | if (!ret && olen > crd->crd_len) { |
| 738 | dprintk("cryptosoft: ERANGE compress %d into %d\n", |
| 739 | crd->crd_len, olen); |
| 740 | if (swcr_fail_if_compression_grows) |
| 741 | ret = ERANGE; |
| 742 | } |
| 743 | } else { /* decompress */ |
| 744 | ret = crypto_comp_decompress(crypto_comp_cast(sw->sw_tfm), |
| 745 | ibuf, ilen, obuf, &olen); |
| 746 | if (!ret && (olen + crd->crd_inject) > crp->crp_olen) { |
| 747 | dprintk("cryptosoft: ETOOSMALL decompress %d into %d, " |
| 748 | "space for %d,at offset %d\n", |
| 749 | crd->crd_len, olen, crp->crp_olen, crd->crd_inject); |
| 750 | ret = ETOOSMALL; |
| 751 | } |
| 752 | } |
| 753 | if (ret) |
| 754 | dprintk("%s,%d: ret = %d\n", __FILE__, __LINE__, ret); |
| 755 | |
| 756 | /* |
| 757 | * on success copy result back, |
| 758 | * linux crpyto API returns -errno, we need to fix that |
| 759 | */ |
| 760 | crp->crp_etype = ret < 0 ? -ret : ret; |
| 761 | if (ret == 0) { |
| 762 | /* copy back the result and return it's size */ |
| 763 | crypto_copyback(crp->crp_flags, crp->crp_buf, |
| 764 | crd->crd_inject, olen, obuf); |
| 765 | crp->crp_olen = olen; |
| 766 | } |
| 767 | |
| 768 | |
| 769 | } break; |
| 770 | |
| 771 | default: |
| 772 | /* Unknown/unsupported algorithm */ |
| 773 | dprintk("%s,%d: EINVAL\n", __FILE__, __LINE__); |
| 774 | crp->crp_etype = EINVAL; |
| 775 | goto done; |
| 776 | } |
| 777 | } |
| 778 | |
| 779 | done: |
| 780 | crypto_done(crp); |
| 781 | return 0; |
| 782 | } |
| 783 | |
| 784 | static int |
| 785 | cryptosoft_init(void) |
| 786 | { |
| 787 | int i, sw_type, mode; |
| 788 | char *algo; |
| 789 | |
| 790 | dprintk("%s(%p)\n", __FUNCTION__, cryptosoft_init); |
| 791 | |
| 792 | softc_device_init(&swcr_softc, "cryptosoft", 0, swcr_methods); |
| 793 | |
| 794 | swcr_id = crypto_get_driverid(softc_get_device(&swcr_softc), |
| 795 | CRYPTOCAP_F_SOFTWARE | CRYPTOCAP_F_SYNC); |
| 796 | if (swcr_id < 0) { |
| 797 | printk("Software crypto device cannot initialize!"); |
| 798 | return -ENODEV; |
| 799 | } |
| 800 | |
| 801 | #define REGISTER(alg) \ |
| 802 | crypto_register(swcr_id, alg, 0,0); |
| 803 | |
| 804 | for (i = CRYPTO_ALGORITHM_MIN; i <= CRYPTO_ALGORITHM_MAX; ++i) |
| 805 | { |
| 806 | |
| 807 | algo = crypto_details[i].alg_name; |
| 808 | if (!algo || !*algo) |
| 809 | { |
| 810 | dprintk("%s:Algorithm %d not supported\n", __FUNCTION__, i); |
| 811 | continue; |
| 812 | } |
| 813 | |
| 814 | mode = crypto_details[i].mode; |
| 815 | sw_type = crypto_details[i].sw_type; |
| 816 | |
| 817 | switch (sw_type) |
| 818 | { |
| 819 | case SW_TYPE_CIPHER: |
| 820 | if (crypto_has_cipher(algo, 0, CRYPTO_ALG_ASYNC)) |
| 821 | { |
| 822 | REGISTER(i); |
| 823 | } |
| 824 | else |
| 825 | { |
| 826 | dprintk("%s:CIPHER algorithm %d:'%s' not supported\n", |
| 827 | __FUNCTION__, i, algo); |
| 828 | } |
| 829 | break; |
| 830 | case SW_TYPE_HMAC: |
| 831 | if (crypto_has_hash(algo, 0, CRYPTO_ALG_ASYNC)) |
| 832 | { |
| 833 | REGISTER(i); |
| 834 | } |
| 835 | else |
| 836 | { |
| 837 | dprintk("%s:HMAC algorithm %d:'%s' not supported\n", |
| 838 | __FUNCTION__, i, algo); |
| 839 | } |
| 840 | break; |
| 841 | case SW_TYPE_HASH: |
| 842 | if (crypto_has_hash(algo, 0, CRYPTO_ALG_ASYNC)) |
| 843 | { |
| 844 | REGISTER(i); |
| 845 | } |
| 846 | else |
| 847 | { |
| 848 | dprintk("%s:HASH algorithm %d:'%s' not supported\n", |
| 849 | __FUNCTION__, i, algo); |
| 850 | } |
| 851 | break; |
| 852 | case SW_TYPE_COMP: |
| 853 | if (crypto_has_comp(algo, 0, CRYPTO_ALG_ASYNC)) |
| 854 | { |
| 855 | REGISTER(i); |
| 856 | } |
| 857 | else |
| 858 | { |
| 859 | dprintk("%s:COMP algorithm %d:'%s' not supported\n", |
| 860 | __FUNCTION__, i, algo); |
| 861 | } |
| 862 | break; |
| 863 | case SW_TYPE_BLKCIPHER: |
| 864 | if (crypto_has_blkcipher(algo, 0, CRYPTO_ALG_ASYNC)) |
| 865 | { |
| 866 | REGISTER(i); |
| 867 | } |
| 868 | else |
| 869 | { |
| 870 | dprintk("%s:BLKCIPHER algorithm %d:'%s' not supported\n", |
| 871 | __FUNCTION__, i, algo); |
| 872 | } |
| 873 | break; |
| 874 | default: |
| 875 | dprintk( |
| 876 | "%s:Algorithm Type %d not supported (algorithm %d:'%s')\n", |
| 877 | __FUNCTION__, sw_type, i, algo); |
| 878 | break; |
| 879 | } |
| 880 | } |
| 881 | |
| 882 | return(0); |
| 883 | } |
| 884 | |
| 885 | static void |
| 886 | cryptosoft_exit(void) |
| 887 | { |
| 888 | dprintk("%s()\n", __FUNCTION__); |
| 889 | crypto_unregister_all(swcr_id); |
| 890 | swcr_id = -1; |
| 891 | } |
| 892 | |
| 893 | module_init(cryptosoft_init); |
| 894 | module_exit(cryptosoft_exit); |
| 895 | |
| 896 | MODULE_LICENSE("Dual BSD/GPL"); |
| 897 | MODULE_AUTHOR("David McCullough <david_mccullough@securecomputing.com>"); |
| 898 | MODULE_DESCRIPTION("Cryptosoft (OCF module for kernel crypto)"); |
| 899 | |
