1/* 2 * linux/drivers/s390/crypto/zcrypt_pcica.c 3 * 4 * zcrypt 2.1.0 5 * 6 * Copyright (C) 2001, 2006 IBM Corporation 7 * Author(s): Robert Burroughs 8 * Eric Rossman (edrossma@us.ibm.com) 9 * 10 * Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com) 11 * Major cleanup & driver split: Martin Schwidefsky <schwidefsky@de.ibm.com> 12 * Ralph Wuerthner <rwuerthn@de.ibm.com> 13 * 14 * This program is free software; you can redistribute it and/or modify 15 * it under the terms of the GNU General Public License as published by 16 * the Free Software Foundation; either version 2, or (at your option) 17 * any later version. 18 * 19 * This program is distributed in the hope that it will be useful, 20 * but WITHOUT ANY WARRANTY; without even the implied warranty of 21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 22 * GNU General Public License for more details. 23 * 24 * You should have received a copy of the GNU General Public License 25 * along with this program; if not, write to the Free Software 26 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 27 */ 28 29#include <linux/module.h> 30#include <linux/slab.h> 31#include <linux/init.h> 32#include <linux/err.h> 33#include <linux/atomic.h> 34#include <asm/uaccess.h> 35 36#include "ap_bus.h" 37#include "zcrypt_api.h" 38#include "zcrypt_error.h" 39#include "zcrypt_pcica.h" 40 41#define PCICA_MIN_MOD_SIZE 1 /* 8 bits */ 42#define PCICA_MAX_MOD_SIZE 256 /* 2048 bits */ 43 44#define PCICA_SPEED_RATING 2800 45 46#define PCICA_MAX_MESSAGE_SIZE 0x3a0 /* sizeof(struct type4_lcr) */ 47#define PCICA_MAX_RESPONSE_SIZE 0x110 /* max outputdatalength + type80_hdr */ 48 49#define PCICA_CLEANUP_TIME (15*HZ) 50 51static struct ap_device_id zcrypt_pcica_ids[] = { 52 { AP_DEVICE(AP_DEVICE_TYPE_PCICA) }, 53 { /* end of list */ }, 54}; 55 56MODULE_DEVICE_TABLE(ap, zcrypt_pcica_ids); 57MODULE_AUTHOR("IBM Corporation"); 58MODULE_DESCRIPTION("PCICA Cryptographic Coprocessor device driver, " 59 "Copyright 2001, 2006 IBM Corporation"); 60MODULE_LICENSE("GPL"); 61 62static int zcrypt_pcica_probe(struct ap_device *ap_dev); 63static void zcrypt_pcica_remove(struct ap_device *ap_dev); 64static void zcrypt_pcica_receive(struct ap_device *, struct ap_message *, 65 struct ap_message *); 66 67static struct ap_driver zcrypt_pcica_driver = { 68 .probe = zcrypt_pcica_probe, 69 .remove = zcrypt_pcica_remove, 70 .receive = zcrypt_pcica_receive, 71 .ids = zcrypt_pcica_ids, 72 .request_timeout = PCICA_CLEANUP_TIME, 73}; 74 75/** 76 * Convert a ICAMEX message to a type4 MEX message. 77 * 78 * @zdev: crypto device pointer 79 * @zreq: crypto request pointer 80 * @mex: pointer to user input data 81 * 82 * Returns 0 on success or -EFAULT. 83 */ 84static int ICAMEX_msg_to_type4MEX_msg(struct zcrypt_device *zdev, 85 struct ap_message *ap_msg, 86 struct ica_rsa_modexpo *mex) 87{ 88 unsigned char *modulus, *exponent, *message; 89 int mod_len; 90 91 mod_len = mex->inputdatalength; 92 93 if (mod_len <= 128) { 94 struct type4_sme *sme = ap_msg->message; 95 memset(sme, 0, sizeof(*sme)); 96 ap_msg->length = sizeof(*sme); 97 sme->header.msg_fmt = TYPE4_SME_FMT; 98 sme->header.msg_len = sizeof(*sme); 99 sme->header.msg_type_code = TYPE4_TYPE_CODE; 100 sme->header.request_code = TYPE4_REQU_CODE; 101 modulus = sme->modulus + sizeof(sme->modulus) - mod_len; 102 exponent = sme->exponent + sizeof(sme->exponent) - mod_len; 103 message = sme->message + sizeof(sme->message) - mod_len; 104 } else { 105 struct type4_lme *lme = ap_msg->message; 106 memset(lme, 0, sizeof(*lme)); 107 ap_msg->length = sizeof(*lme); 108 lme->header.msg_fmt = TYPE4_LME_FMT; 109 lme->header.msg_len = sizeof(*lme); 110 lme->header.msg_type_code = TYPE4_TYPE_CODE; 111 lme->header.request_code = TYPE4_REQU_CODE; 112 modulus = lme->modulus + sizeof(lme->modulus) - mod_len; 113 exponent = lme->exponent + sizeof(lme->exponent) - mod_len; 114 message = lme->message + sizeof(lme->message) - mod_len; 115 } 116 117 if (copy_from_user(modulus, mex->n_modulus, mod_len) || 118 copy_from_user(exponent, mex->b_key, mod_len) || 119 copy_from_user(message, mex->inputdata, mod_len)) 120 return -EFAULT; 121 return 0; 122} 123 124/** 125 * Convert a ICACRT message to a type4 CRT message. 126 * 127 * @zdev: crypto device pointer 128 * @zreq: crypto request pointer 129 * @crt: pointer to user input data 130 * 131 * Returns 0 on success or -EFAULT. 132 */ 133static int ICACRT_msg_to_type4CRT_msg(struct zcrypt_device *zdev, 134 struct ap_message *ap_msg, 135 struct ica_rsa_modexpo_crt *crt) 136{ 137 unsigned char *p, *q, *dp, *dq, *u, *inp; 138 int mod_len, short_len, long_len; 139 140 mod_len = crt->inputdatalength; 141 short_len = mod_len / 2; 142 long_len = mod_len / 2 + 8; 143 144 if (mod_len <= 128) { 145 struct type4_scr *scr = ap_msg->message; 146 memset(scr, 0, sizeof(*scr)); 147 ap_msg->length = sizeof(*scr); 148 scr->header.msg_type_code = TYPE4_TYPE_CODE; 149 scr->header.request_code = TYPE4_REQU_CODE; 150 scr->header.msg_fmt = TYPE4_SCR_FMT; 151 scr->header.msg_len = sizeof(*scr); 152 p = scr->p + sizeof(scr->p) - long_len; 153 q = scr->q + sizeof(scr->q) - short_len; 154 dp = scr->dp + sizeof(scr->dp) - long_len; 155 dq = scr->dq + sizeof(scr->dq) - short_len; 156 u = scr->u + sizeof(scr->u) - long_len; 157 inp = scr->message + sizeof(scr->message) - mod_len; 158 } else { 159 struct type4_lcr *lcr = ap_msg->message; 160 memset(lcr, 0, sizeof(*lcr)); 161 ap_msg->length = sizeof(*lcr); 162 lcr->header.msg_type_code = TYPE4_TYPE_CODE; 163 lcr->header.request_code = TYPE4_REQU_CODE; 164 lcr->header.msg_fmt = TYPE4_LCR_FMT; 165 lcr->header.msg_len = sizeof(*lcr); 166 p = lcr->p + sizeof(lcr->p) - long_len; 167 q = lcr->q + sizeof(lcr->q) - short_len; 168 dp = lcr->dp + sizeof(lcr->dp) - long_len; 169 dq = lcr->dq + sizeof(lcr->dq) - short_len; 170 u = lcr->u + sizeof(lcr->u) - long_len; 171 inp = lcr->message + sizeof(lcr->message) - mod_len; 172 } 173 174 if (copy_from_user(p, crt->np_prime, long_len) || 175 copy_from_user(q, crt->nq_prime, short_len) || 176 copy_from_user(dp, crt->bp_key, long_len) || 177 copy_from_user(dq, crt->bq_key, short_len) || 178 copy_from_user(u, crt->u_mult_inv, long_len) || 179 copy_from_user(inp, crt->inputdata, mod_len)) 180 return -EFAULT; 181 return 0; 182} 183 184/** 185 * Copy results from a type 84 reply message back to user space. 186 * 187 * @zdev: crypto device pointer 188 * @reply: reply AP message. 189 * @data: pointer to user output data 190 * @length: size of user output data 191 * 192 * Returns 0 on success or -EFAULT. 193 */ 194static int convert_type84(struct zcrypt_device *zdev, 195 struct ap_message *reply, 196 char __user *outputdata, 197 unsigned int outputdatalength) 198{ 199 struct type84_hdr *t84h = reply->message; 200 char *data; 201 202 if (t84h->len < sizeof(*t84h) + outputdatalength) { 203 /* The result is too short, the PCICA card may not do that.. */ 204 zdev->online = 0; 205 return -EAGAIN; /* repeat the request on a different device. */ 206 } 207 BUG_ON(t84h->len > PCICA_MAX_RESPONSE_SIZE); 208 data = reply->message + t84h->len - outputdatalength; 209 if (copy_to_user(outputdata, data, outputdatalength)) 210 return -EFAULT; 211 return 0; 212} 213 214static int convert_response(struct zcrypt_device *zdev, 215 struct ap_message *reply, 216 char __user *outputdata, 217 unsigned int outputdatalength) 218{ 219 /* Response type byte is the second byte in the response. */ 220 switch (((unsigned char *) reply->message)[1]) { 221 case TYPE82_RSP_CODE: 222 case TYPE88_RSP_CODE: 223 return convert_error(zdev, reply); 224 case TYPE84_RSP_CODE: 225 return convert_type84(zdev, reply, 226 outputdata, outputdatalength); 227 default: /* Unknown response type, this should NEVER EVER happen */ 228 zdev->online = 0; 229 return -EAGAIN; /* repeat the request on a different device. */ 230 } 231} 232 233/** 234 * This function is called from the AP bus code after a crypto request 235 * "msg" has finished with the reply message "reply". 236 * It is called from tasklet context. 237 * @ap_dev: pointer to the AP device 238 * @msg: pointer to the AP message 239 * @reply: pointer to the AP reply message 240 */ 241static void zcrypt_pcica_receive(struct ap_device *ap_dev, 242 struct ap_message *msg, 243 struct ap_message *reply) 244{ 245 static struct error_hdr error_reply = { 246 .type = TYPE82_RSP_CODE, 247 .reply_code = REP82_ERROR_MACHINE_FAILURE, 248 }; 249 struct type84_hdr *t84h; 250 int length; 251 252 /* Copy the reply message to the request message buffer. */ 253 if (IS_ERR(reply)) { 254 memcpy(msg->message, &error_reply, sizeof(error_reply)); 255 goto out; 256 } 257 t84h = reply->message; 258 if (t84h->code == TYPE84_RSP_CODE) { 259 length = min(PCICA_MAX_RESPONSE_SIZE, (int) t84h->len); 260 memcpy(msg->message, reply->message, length); 261 } else 262 memcpy(msg->message, reply->message, sizeof error_reply); 263out: 264 complete((struct completion *) msg->private); 265} 266 267static atomic_t zcrypt_step = ATOMIC_INIT(0); 268 269/** 270 * The request distributor calls this function if it picked the PCICA 271 * device to handle a modexpo request. 272 * @zdev: pointer to zcrypt_device structure that identifies the 273 * PCICA device to the request distributor 274 * @mex: pointer to the modexpo request buffer 275 */ 276static long zcrypt_pcica_modexpo(struct zcrypt_device *zdev, 277 struct ica_rsa_modexpo *mex) 278{ 279 struct ap_message ap_msg; 280 struct completion work; 281 int rc; 282 283 ap_init_message(&ap_msg); 284 ap_msg.message = kmalloc(PCICA_MAX_MESSAGE_SIZE, GFP_KERNEL); 285 if (!ap_msg.message) 286 return -ENOMEM; 287 ap_msg.psmid = (((unsigned long long) current->pid) << 32) + 288 atomic_inc_return(&zcrypt_step); 289 ap_msg.private = &work; 290 rc = ICAMEX_msg_to_type4MEX_msg(zdev, &ap_msg, mex); 291 if (rc) 292 goto out_free; 293 init_completion(&work); 294 ap_queue_message(zdev->ap_dev, &ap_msg); 295 rc = wait_for_completion_interruptible(&work); 296 if (rc == 0) 297 rc = convert_response(zdev, &ap_msg, mex->outputdata, 298 mex->outputdatalength); 299 else 300 /* Signal pending. */ 301 ap_cancel_message(zdev->ap_dev, &ap_msg); 302out_free: 303 kfree(ap_msg.message); 304 return rc; 305} 306 307/** 308 * The request distributor calls this function if it picked the PCICA 309 * device to handle a modexpo_crt request. 310 * @zdev: pointer to zcrypt_device structure that identifies the 311 * PCICA device to the request distributor 312 * @crt: pointer to the modexpoc_crt request buffer 313 */ 314static long zcrypt_pcica_modexpo_crt(struct zcrypt_device *zdev, 315 struct ica_rsa_modexpo_crt *crt) 316{ 317 struct ap_message ap_msg; 318 struct completion work; 319 int rc; 320 321 ap_init_message(&ap_msg); 322 ap_msg.message = kmalloc(PCICA_MAX_MESSAGE_SIZE, GFP_KERNEL); 323 if (!ap_msg.message) 324 return -ENOMEM; 325 ap_msg.psmid = (((unsigned long long) current->pid) << 32) + 326 atomic_inc_return(&zcrypt_step); 327 ap_msg.private = &work; 328 rc = ICACRT_msg_to_type4CRT_msg(zdev, &ap_msg, crt); 329 if (rc) 330 goto out_free; 331 init_completion(&work); 332 ap_queue_message(zdev->ap_dev, &ap_msg); 333 rc = wait_for_completion_interruptible(&work); 334 if (rc == 0) 335 rc = convert_response(zdev, &ap_msg, crt->outputdata, 336 crt->outputdatalength); 337 else 338 /* Signal pending. */ 339 ap_cancel_message(zdev->ap_dev, &ap_msg); 340out_free: 341 kfree(ap_msg.message); 342 return rc; 343} 344 345/** 346 * The crypto operations for a PCICA card. 347 */ 348static struct zcrypt_ops zcrypt_pcica_ops = { 349 .rsa_modexpo = zcrypt_pcica_modexpo, 350 .rsa_modexpo_crt = zcrypt_pcica_modexpo_crt, 351}; 352 353/** 354 * Probe function for PCICA cards. It always accepts the AP device 355 * since the bus_match already checked the hardware type. 356 * @ap_dev: pointer to the AP device. 357 */ 358static int zcrypt_pcica_probe(struct ap_device *ap_dev) 359{ 360 struct zcrypt_device *zdev; 361 int rc; 362 363 zdev = zcrypt_device_alloc(PCICA_MAX_RESPONSE_SIZE); 364 if (!zdev) 365 return -ENOMEM; 366 zdev->ap_dev = ap_dev; 367 zdev->ops = &zcrypt_pcica_ops; 368 zdev->online = 1; 369 zdev->user_space_type = ZCRYPT_PCICA; 370 zdev->type_string = "PCICA"; 371 zdev->min_mod_size = PCICA_MIN_MOD_SIZE; 372 zdev->max_mod_size = PCICA_MAX_MOD_SIZE; 373 zdev->speed_rating = PCICA_SPEED_RATING; 374 zdev->max_exp_bit_length = PCICA_MAX_MOD_SIZE; 375 ap_dev->reply = &zdev->reply; 376 ap_dev->private = zdev; 377 rc = zcrypt_device_register(zdev); 378 if (rc) 379 goto out_free; 380 return 0; 381 382out_free: 383 ap_dev->private = NULL; 384 zcrypt_device_free(zdev); 385 return rc; 386} 387 388/** 389 * This is called to remove the extended PCICA driver information 390 * if an AP device is removed. 391 */ 392static void zcrypt_pcica_remove(struct ap_device *ap_dev) 393{ 394 struct zcrypt_device *zdev = ap_dev->private; 395 396 zcrypt_device_unregister(zdev); 397} 398 399int __init zcrypt_pcica_init(void) 400{ 401 return ap_driver_register(&zcrypt_pcica_driver, THIS_MODULE, "pcica"); 402} 403 404void zcrypt_pcica_exit(void) 405{ 406 ap_driver_unregister(&zcrypt_pcica_driver); 407} 408 409module_init(zcrypt_pcica_init); 410module_exit(zcrypt_pcica_exit); 411