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 <asm/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 56#ifndef CONFIG_ZCRYPT_MONOLITHIC 57MODULE_DEVICE_TABLE(ap, zcrypt_pcica_ids); 58MODULE_AUTHOR("IBM Corporation"); 59MODULE_DESCRIPTION("PCICA Cryptographic Coprocessor device driver, " 60 "Copyright 2001, 2006 IBM Corporation"); 61MODULE_LICENSE("GPL"); 62#endif 63 64static int zcrypt_pcica_probe(struct ap_device *ap_dev); 65static void zcrypt_pcica_remove(struct ap_device *ap_dev); 66static void zcrypt_pcica_receive(struct ap_device *, struct ap_message *, 67 struct ap_message *); 68 69static struct ap_driver zcrypt_pcica_driver = { 70 .probe = zcrypt_pcica_probe, 71 .remove = zcrypt_pcica_remove, 72 .receive = zcrypt_pcica_receive, 73 .ids = zcrypt_pcica_ids, 74 .request_timeout = PCICA_CLEANUP_TIME, 75}; 76 77/** 78 * Convert a ICAMEX message to a type4 MEX message. 79 * 80 * @zdev: crypto device pointer 81 * @zreq: crypto request pointer 82 * @mex: pointer to user input data 83 * 84 * Returns 0 on success or -EFAULT. 85 */ 86static int ICAMEX_msg_to_type4MEX_msg(struct zcrypt_device *zdev, 87 struct ap_message *ap_msg, 88 struct ica_rsa_modexpo *mex) 89{ 90 unsigned char *modulus, *exponent, *message; 91 int mod_len; 92 93 mod_len = mex->inputdatalength; 94 95 if (mod_len <= 128) { 96 struct type4_sme *sme = ap_msg->message; 97 memset(sme, 0, sizeof(*sme)); 98 ap_msg->length = sizeof(*sme); 99 sme->header.msg_fmt = TYPE4_SME_FMT; 100 sme->header.msg_len = sizeof(*sme); 101 sme->header.msg_type_code = TYPE4_TYPE_CODE; 102 sme->header.request_code = TYPE4_REQU_CODE; 103 modulus = sme->modulus + sizeof(sme->modulus) - mod_len; 104 exponent = sme->exponent + sizeof(sme->exponent) - mod_len; 105 message = sme->message + sizeof(sme->message) - mod_len; 106 } else { 107 struct type4_lme *lme = ap_msg->message; 108 memset(lme, 0, sizeof(*lme)); 109 ap_msg->length = sizeof(*lme); 110 lme->header.msg_fmt = TYPE4_LME_FMT; 111 lme->header.msg_len = sizeof(*lme); 112 lme->header.msg_type_code = TYPE4_TYPE_CODE; 113 lme->header.request_code = TYPE4_REQU_CODE; 114 modulus = lme->modulus + sizeof(lme->modulus) - mod_len; 115 exponent = lme->exponent + sizeof(lme->exponent) - mod_len; 116 message = lme->message + sizeof(lme->message) - mod_len; 117 } 118 119 if (copy_from_user(modulus, mex->n_modulus, mod_len) || 120 copy_from_user(exponent, mex->b_key, mod_len) || 121 copy_from_user(message, mex->inputdata, mod_len)) 122 return -EFAULT; 123 return 0; 124} 125 126/** 127 * Convert a ICACRT message to a type4 CRT message. 128 * 129 * @zdev: crypto device pointer 130 * @zreq: crypto request pointer 131 * @crt: pointer to user input data 132 * 133 * Returns 0 on success or -EFAULT. 134 */ 135static int ICACRT_msg_to_type4CRT_msg(struct zcrypt_device *zdev, 136 struct ap_message *ap_msg, 137 struct ica_rsa_modexpo_crt *crt) 138{ 139 unsigned char *p, *q, *dp, *dq, *u, *inp; 140 int mod_len, short_len, long_len; 141 142 mod_len = crt->inputdatalength; 143 short_len = mod_len / 2; 144 long_len = mod_len / 2 + 8; 145 146 if (mod_len <= 128) { 147 struct type4_scr *scr = ap_msg->message; 148 memset(scr, 0, sizeof(*scr)); 149 ap_msg->length = sizeof(*scr); 150 scr->header.msg_type_code = TYPE4_TYPE_CODE; 151 scr->header.request_code = TYPE4_REQU_CODE; 152 scr->header.msg_fmt = TYPE4_SCR_FMT; 153 scr->header.msg_len = sizeof(*scr); 154 p = scr->p + sizeof(scr->p) - long_len; 155 q = scr->q + sizeof(scr->q) - short_len; 156 dp = scr->dp + sizeof(scr->dp) - long_len; 157 dq = scr->dq + sizeof(scr->dq) - short_len; 158 u = scr->u + sizeof(scr->u) - long_len; 159 inp = scr->message + sizeof(scr->message) - mod_len; 160 } else { 161 struct type4_lcr *lcr = ap_msg->message; 162 memset(lcr, 0, sizeof(*lcr)); 163 ap_msg->length = sizeof(*lcr); 164 lcr->header.msg_type_code = TYPE4_TYPE_CODE; 165 lcr->header.request_code = TYPE4_REQU_CODE; 166 lcr->header.msg_fmt = TYPE4_LCR_FMT; 167 lcr->header.msg_len = sizeof(*lcr); 168 p = lcr->p + sizeof(lcr->p) - long_len; 169 q = lcr->q + sizeof(lcr->q) - short_len; 170 dp = lcr->dp + sizeof(lcr->dp) - long_len; 171 dq = lcr->dq + sizeof(lcr->dq) - short_len; 172 u = lcr->u + sizeof(lcr->u) - long_len; 173 inp = lcr->message + sizeof(lcr->message) - mod_len; 174 } 175 176 if (copy_from_user(p, crt->np_prime, long_len) || 177 copy_from_user(q, crt->nq_prime, short_len) || 178 copy_from_user(dp, crt->bp_key, long_len) || 179 copy_from_user(dq, crt->bq_key, short_len) || 180 copy_from_user(u, crt->u_mult_inv, long_len) || 181 copy_from_user(inp, crt->inputdata, mod_len)) 182 return -EFAULT; 183 return 0; 184} 185 186/** 187 * Copy results from a type 84 reply message back to user space. 188 * 189 * @zdev: crypto device pointer 190 * @reply: reply AP message. 191 * @data: pointer to user output data 192 * @length: size of user output data 193 * 194 * Returns 0 on success or -EFAULT. 195 */ 196static int convert_type84(struct zcrypt_device *zdev, 197 struct ap_message *reply, 198 char __user *outputdata, 199 unsigned int outputdatalength) 200{ 201 struct type84_hdr *t84h = reply->message; 202 char *data; 203 204 if (t84h->len < sizeof(*t84h) + outputdatalength) { 205 /* The result is too short, the PCICA card may not do that.. */ 206 zdev->online = 0; 207 return -EAGAIN; /* repeat the request on a different device. */ 208 } 209 BUG_ON(t84h->len > PCICA_MAX_RESPONSE_SIZE); 210 data = reply->message + t84h->len - outputdatalength; 211 if (copy_to_user(outputdata, data, outputdatalength)) 212 return -EFAULT; 213 return 0; 214} 215 216static int convert_response(struct zcrypt_device *zdev, 217 struct ap_message *reply, 218 char __user *outputdata, 219 unsigned int outputdatalength) 220{ 221 /* Response type byte is the second byte in the response. */ 222 switch (((unsigned char *) reply->message)[1]) { 223 case TYPE82_RSP_CODE: 224 case TYPE88_RSP_CODE: 225 return convert_error(zdev, reply); 226 case TYPE84_RSP_CODE: 227 return convert_type84(zdev, reply, 228 outputdata, outputdatalength); 229 default: /* Unknown response type, this should NEVER EVER happen */ 230 zdev->online = 0; 231 return -EAGAIN; /* repeat the request on a different device. */ 232 } 233} 234 235/** 236 * This function is called from the AP bus code after a crypto request 237 * "msg" has finished with the reply message "reply". 238 * It is called from tasklet context. 239 * @ap_dev: pointer to the AP device 240 * @msg: pointer to the AP message 241 * @reply: pointer to the AP reply message 242 */ 243static void zcrypt_pcica_receive(struct ap_device *ap_dev, 244 struct ap_message *msg, 245 struct ap_message *reply) 246{ 247 static struct error_hdr error_reply = { 248 .type = TYPE82_RSP_CODE, 249 .reply_code = REP82_ERROR_MACHINE_FAILURE, 250 }; 251 struct type84_hdr *t84h; 252 int length; 253 254 /* Copy the reply message to the request message buffer. */ 255 if (IS_ERR(reply)) { 256 memcpy(msg->message, &error_reply, sizeof(error_reply)); 257 goto out; 258 } 259 t84h = reply->message; 260 if (t84h->code == TYPE84_RSP_CODE) { 261 length = min(PCICA_MAX_RESPONSE_SIZE, (int) t84h->len); 262 memcpy(msg->message, reply->message, length); 263 } else 264 memcpy(msg->message, reply->message, sizeof error_reply); 265out: 266 complete((struct completion *) msg->private); 267} 268 269static atomic_t zcrypt_step = ATOMIC_INIT(0); 270 271/** 272 * The request distributor calls this function if it picked the PCICA 273 * device to handle a modexpo request. 274 * @zdev: pointer to zcrypt_device structure that identifies the 275 * PCICA device to the request distributor 276 * @mex: pointer to the modexpo request buffer 277 */ 278static long zcrypt_pcica_modexpo(struct zcrypt_device *zdev, 279 struct ica_rsa_modexpo *mex) 280{ 281 struct ap_message ap_msg; 282 struct completion work; 283 int rc; 284 285 ap_init_message(&ap_msg); 286 ap_msg.message = kmalloc(PCICA_MAX_MESSAGE_SIZE, GFP_KERNEL); 287 if (!ap_msg.message) 288 return -ENOMEM; 289 ap_msg.psmid = (((unsigned long long) current->pid) << 32) + 290 atomic_inc_return(&zcrypt_step); 291 ap_msg.private = &work; 292 rc = ICAMEX_msg_to_type4MEX_msg(zdev, &ap_msg, mex); 293 if (rc) 294 goto out_free; 295 init_completion(&work); 296 ap_queue_message(zdev->ap_dev, &ap_msg); 297 rc = wait_for_completion_interruptible(&work); 298 if (rc == 0) 299 rc = convert_response(zdev, &ap_msg, mex->outputdata, 300 mex->outputdatalength); 301 else 302 /* Signal pending. */ 303 ap_cancel_message(zdev->ap_dev, &ap_msg); 304out_free: 305 kfree(ap_msg.message); 306 return rc; 307} 308 309/** 310 * The request distributor calls this function if it picked the PCICA 311 * device to handle a modexpo_crt request. 312 * @zdev: pointer to zcrypt_device structure that identifies the 313 * PCICA device to the request distributor 314 * @crt: pointer to the modexpoc_crt request buffer 315 */ 316static long zcrypt_pcica_modexpo_crt(struct zcrypt_device *zdev, 317 struct ica_rsa_modexpo_crt *crt) 318{ 319 struct ap_message ap_msg; 320 struct completion work; 321 int rc; 322 323 ap_init_message(&ap_msg); 324 ap_msg.message = kmalloc(PCICA_MAX_MESSAGE_SIZE, GFP_KERNEL); 325 if (!ap_msg.message) 326 return -ENOMEM; 327 ap_msg.psmid = (((unsigned long long) current->pid) << 32) + 328 atomic_inc_return(&zcrypt_step); 329 ap_msg.private = &work; 330 rc = ICACRT_msg_to_type4CRT_msg(zdev, &ap_msg, crt); 331 if (rc) 332 goto out_free; 333 init_completion(&work); 334 ap_queue_message(zdev->ap_dev, &ap_msg); 335 rc = wait_for_completion_interruptible(&work); 336 if (rc == 0) 337 rc = convert_response(zdev, &ap_msg, crt->outputdata, 338 crt->outputdatalength); 339 else 340 /* Signal pending. */ 341 ap_cancel_message(zdev->ap_dev, &ap_msg); 342out_free: 343 kfree(ap_msg.message); 344 return rc; 345} 346 347/** 348 * The crypto operations for a PCICA card. 349 */ 350static struct zcrypt_ops zcrypt_pcica_ops = { 351 .rsa_modexpo = zcrypt_pcica_modexpo, 352 .rsa_modexpo_crt = zcrypt_pcica_modexpo_crt, 353}; 354 355/** 356 * Probe function for PCICA cards. It always accepts the AP device 357 * since the bus_match already checked the hardware type. 358 * @ap_dev: pointer to the AP device. 359 */ 360static int zcrypt_pcica_probe(struct ap_device *ap_dev) 361{ 362 struct zcrypt_device *zdev; 363 int rc; 364 365 zdev = zcrypt_device_alloc(PCICA_MAX_RESPONSE_SIZE); 366 if (!zdev) 367 return -ENOMEM; 368 zdev->ap_dev = ap_dev; 369 zdev->ops = &zcrypt_pcica_ops; 370 zdev->online = 1; 371 zdev->user_space_type = ZCRYPT_PCICA; 372 zdev->type_string = "PCICA"; 373 zdev->min_mod_size = PCICA_MIN_MOD_SIZE; 374 zdev->max_mod_size = PCICA_MAX_MOD_SIZE; 375 zdev->speed_rating = PCICA_SPEED_RATING; 376 ap_dev->reply = &zdev->reply; 377 ap_dev->private = zdev; 378 rc = zcrypt_device_register(zdev); 379 if (rc) 380 goto out_free; 381 return 0; 382 383out_free: 384 ap_dev->private = NULL; 385 zcrypt_device_free(zdev); 386 return rc; 387} 388 389/** 390 * This is called to remove the extended PCICA driver information 391 * if an AP device is removed. 392 */ 393static void zcrypt_pcica_remove(struct ap_device *ap_dev) 394{ 395 struct zcrypt_device *zdev = ap_dev->private; 396 397 zcrypt_device_unregister(zdev); 398} 399 400int __init zcrypt_pcica_init(void) 401{ 402 return ap_driver_register(&zcrypt_pcica_driver, THIS_MODULE, "pcica"); 403} 404 405void zcrypt_pcica_exit(void) 406{ 407 ap_driver_unregister(&zcrypt_pcica_driver); 408} 409 410#ifndef CONFIG_ZCRYPT_MONOLITHIC 411module_init(zcrypt_pcica_init); 412module_exit(zcrypt_pcica_exit); 413#endif 414