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963ed931 MS |
1 | /* |
2 | * linux/drivers/s390/crypto/zcrypt_cex2a.c | |
3 | * | |
5432114b | 4 | * zcrypt 2.1.0 |
963ed931 MS |
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/init.h> | |
31 | #include <linux/err.h> | |
32 | #include <asm/atomic.h> | |
33 | #include <asm/uaccess.h> | |
34 | ||
35 | #include "ap_bus.h" | |
36 | #include "zcrypt_api.h" | |
37 | #include "zcrypt_error.h" | |
38 | #include "zcrypt_cex2a.h" | |
39 | ||
40 | #define CEX2A_MIN_MOD_SIZE 1 /* 8 bits */ | |
41 | #define CEX2A_MAX_MOD_SIZE 256 /* 2048 bits */ | |
42 | ||
43 | #define CEX2A_SPEED_RATING 970 | |
44 | ||
45 | #define CEX2A_MAX_MESSAGE_SIZE 0x390 /* sizeof(struct type50_crb2_msg) */ | |
46 | #define CEX2A_MAX_RESPONSE_SIZE 0x110 /* max outputdatalength + type80_hdr */ | |
47 | ||
48 | #define CEX2A_CLEANUP_TIME (15*HZ) | |
49 | ||
50 | static struct ap_device_id zcrypt_cex2a_ids[] = { | |
51 | { AP_DEVICE(AP_DEVICE_TYPE_CEX2A) }, | |
52 | { /* end of list */ }, | |
53 | }; | |
54 | ||
55 | #ifndef CONFIG_ZCRYPT_MONOLITHIC | |
56 | MODULE_DEVICE_TABLE(ap, zcrypt_cex2a_ids); | |
57 | MODULE_AUTHOR("IBM Corporation"); | |
58 | MODULE_DESCRIPTION("CEX2A Cryptographic Coprocessor device driver, " | |
59 | "Copyright 2001, 2006 IBM Corporation"); | |
60 | MODULE_LICENSE("GPL"); | |
61 | #endif | |
62 | ||
63 | static int zcrypt_cex2a_probe(struct ap_device *ap_dev); | |
64 | static void zcrypt_cex2a_remove(struct ap_device *ap_dev); | |
65 | static void zcrypt_cex2a_receive(struct ap_device *, struct ap_message *, | |
66 | struct ap_message *); | |
67 | ||
68 | static struct ap_driver zcrypt_cex2a_driver = { | |
69 | .probe = zcrypt_cex2a_probe, | |
70 | .remove = zcrypt_cex2a_remove, | |
71 | .receive = zcrypt_cex2a_receive, | |
72 | .ids = zcrypt_cex2a_ids, | |
73 | }; | |
74 | ||
75 | /** | |
76 | * Convert a ICAMEX message to a type50 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 | */ | |
84 | static int ICAMEX_msg_to_type50MEX_msg(struct zcrypt_device *zdev, | |
85 | struct ap_message *ap_msg, | |
86 | struct ica_rsa_modexpo *mex) | |
87 | { | |
88 | unsigned char *mod, *exp, *inp; | |
89 | int mod_len; | |
90 | ||
91 | mod_len = mex->inputdatalength; | |
92 | ||
93 | if (mod_len <= 128) { | |
94 | struct type50_meb1_msg *meb1 = ap_msg->message; | |
95 | memset(meb1, 0, sizeof(*meb1)); | |
96 | ap_msg->length = sizeof(*meb1); | |
97 | meb1->header.msg_type_code = TYPE50_TYPE_CODE; | |
98 | meb1->header.msg_len = sizeof(*meb1); | |
99 | meb1->keyblock_type = TYPE50_MEB1_FMT; | |
100 | mod = meb1->modulus + sizeof(meb1->modulus) - mod_len; | |
101 | exp = meb1->exponent + sizeof(meb1->exponent) - mod_len; | |
102 | inp = meb1->message + sizeof(meb1->message) - mod_len; | |
103 | } else { | |
104 | struct type50_meb2_msg *meb2 = ap_msg->message; | |
105 | memset(meb2, 0, sizeof(*meb2)); | |
106 | ap_msg->length = sizeof(*meb2); | |
107 | meb2->header.msg_type_code = TYPE50_TYPE_CODE; | |
108 | meb2->header.msg_len = sizeof(*meb2); | |
109 | meb2->keyblock_type = TYPE50_MEB2_FMT; | |
110 | mod = meb2->modulus + sizeof(meb2->modulus) - mod_len; | |
111 | exp = meb2->exponent + sizeof(meb2->exponent) - mod_len; | |
112 | inp = meb2->message + sizeof(meb2->message) - mod_len; | |
113 | } | |
114 | ||
115 | if (copy_from_user(mod, mex->n_modulus, mod_len) || | |
116 | copy_from_user(exp, mex->b_key, mod_len) || | |
117 | copy_from_user(inp, mex->inputdata, mod_len)) | |
118 | return -EFAULT; | |
119 | return 0; | |
120 | } | |
121 | ||
122 | /** | |
123 | * Convert a ICACRT message to a type50 CRT message. | |
124 | * | |
125 | * @zdev: crypto device pointer | |
126 | * @zreq: crypto request pointer | |
127 | * @crt: pointer to user input data | |
128 | * | |
129 | * Returns 0 on success or -EFAULT. | |
130 | */ | |
131 | static int ICACRT_msg_to_type50CRT_msg(struct zcrypt_device *zdev, | |
132 | struct ap_message *ap_msg, | |
133 | struct ica_rsa_modexpo_crt *crt) | |
134 | { | |
135 | int mod_len, short_len, long_len, long_offset; | |
136 | unsigned char *p, *q, *dp, *dq, *u, *inp; | |
137 | ||
138 | mod_len = crt->inputdatalength; | |
139 | short_len = mod_len / 2; | |
140 | long_len = mod_len / 2 + 8; | |
141 | ||
142 | /* | |
143 | * CEX2A cannot handle p, dp, or U > 128 bytes. | |
144 | * If we have one of these, we need to do extra checking. | |
145 | */ | |
146 | if (long_len > 128) { | |
147 | /* | |
148 | * zcrypt_rsa_crt already checked for the leading | |
149 | * zeroes of np_prime, bp_key and u_mult_inc. | |
150 | */ | |
151 | long_offset = long_len - 128; | |
152 | long_len = 128; | |
153 | } else | |
154 | long_offset = 0; | |
155 | ||
156 | /* | |
157 | * Instead of doing extra work for p, dp, U > 64 bytes, we'll just use | |
158 | * the larger message structure. | |
159 | */ | |
160 | if (long_len <= 64) { | |
161 | struct type50_crb1_msg *crb1 = ap_msg->message; | |
162 | memset(crb1, 0, sizeof(*crb1)); | |
163 | ap_msg->length = sizeof(*crb1); | |
164 | crb1->header.msg_type_code = TYPE50_TYPE_CODE; | |
165 | crb1->header.msg_len = sizeof(*crb1); | |
166 | crb1->keyblock_type = TYPE50_CRB1_FMT; | |
167 | p = crb1->p + sizeof(crb1->p) - long_len; | |
168 | q = crb1->q + sizeof(crb1->q) - short_len; | |
169 | dp = crb1->dp + sizeof(crb1->dp) - long_len; | |
170 | dq = crb1->dq + sizeof(crb1->dq) - short_len; | |
171 | u = crb1->u + sizeof(crb1->u) - long_len; | |
172 | inp = crb1->message + sizeof(crb1->message) - mod_len; | |
173 | } else { | |
174 | struct type50_crb2_msg *crb2 = ap_msg->message; | |
175 | memset(crb2, 0, sizeof(*crb2)); | |
176 | ap_msg->length = sizeof(*crb2); | |
177 | crb2->header.msg_type_code = TYPE50_TYPE_CODE; | |
178 | crb2->header.msg_len = sizeof(*crb2); | |
179 | crb2->keyblock_type = TYPE50_CRB2_FMT; | |
180 | p = crb2->p + sizeof(crb2->p) - long_len; | |
181 | q = crb2->q + sizeof(crb2->q) - short_len; | |
182 | dp = crb2->dp + sizeof(crb2->dp) - long_len; | |
183 | dq = crb2->dq + sizeof(crb2->dq) - short_len; | |
184 | u = crb2->u + sizeof(crb2->u) - long_len; | |
185 | inp = crb2->message + sizeof(crb2->message) - mod_len; | |
186 | } | |
187 | ||
188 | if (copy_from_user(p, crt->np_prime + long_offset, long_len) || | |
189 | copy_from_user(q, crt->nq_prime, short_len) || | |
190 | copy_from_user(dp, crt->bp_key + long_offset, long_len) || | |
191 | copy_from_user(dq, crt->bq_key, short_len) || | |
192 | copy_from_user(u, crt->u_mult_inv + long_offset, long_len) || | |
193 | copy_from_user(inp, crt->inputdata, mod_len)) | |
194 | return -EFAULT; | |
195 | ||
196 | ||
197 | return 0; | |
198 | } | |
199 | ||
200 | /** | |
201 | * Copy results from a type 80 reply message back to user space. | |
202 | * | |
203 | * @zdev: crypto device pointer | |
204 | * @reply: reply AP message. | |
205 | * @data: pointer to user output data | |
206 | * @length: size of user output data | |
207 | * | |
208 | * Returns 0 on success or -EFAULT. | |
209 | */ | |
210 | static int convert_type80(struct zcrypt_device *zdev, | |
211 | struct ap_message *reply, | |
212 | char __user *outputdata, | |
213 | unsigned int outputdatalength) | |
214 | { | |
215 | struct type80_hdr *t80h = reply->message; | |
216 | unsigned char *data; | |
217 | ||
218 | if (t80h->len < sizeof(*t80h) + outputdatalength) { | |
219 | /* The result is too short, the CEX2A card may not do that.. */ | |
220 | zdev->online = 0; | |
221 | return -EAGAIN; /* repeat the request on a different device. */ | |
222 | } | |
223 | BUG_ON(t80h->len > CEX2A_MAX_RESPONSE_SIZE); | |
224 | data = reply->message + t80h->len - outputdatalength; | |
225 | if (copy_to_user(outputdata, data, outputdatalength)) | |
226 | return -EFAULT; | |
227 | return 0; | |
228 | } | |
229 | ||
230 | static int convert_response(struct zcrypt_device *zdev, | |
231 | struct ap_message *reply, | |
232 | char __user *outputdata, | |
233 | unsigned int outputdatalength) | |
234 | { | |
235 | /* Response type byte is the second byte in the response. */ | |
236 | switch (((unsigned char *) reply->message)[1]) { | |
237 | case TYPE82_RSP_CODE: | |
238 | case TYPE88_RSP_CODE: | |
239 | return convert_error(zdev, reply); | |
240 | case TYPE80_RSP_CODE: | |
241 | return convert_type80(zdev, reply, | |
242 | outputdata, outputdatalength); | |
243 | default: /* Unknown response type, this should NEVER EVER happen */ | |
244 | PRINTK("Unrecognized Message Header: %08x%08x\n", | |
245 | *(unsigned int *) reply->message, | |
246 | *(unsigned int *) (reply->message+4)); | |
247 | zdev->online = 0; | |
248 | return -EAGAIN; /* repeat the request on a different device. */ | |
249 | } | |
250 | } | |
251 | ||
252 | /** | |
253 | * This function is called from the AP bus code after a crypto request | |
254 | * "msg" has finished with the reply message "reply". | |
255 | * It is called from tasklet context. | |
256 | * @ap_dev: pointer to the AP device | |
257 | * @msg: pointer to the AP message | |
258 | * @reply: pointer to the AP reply message | |
259 | */ | |
260 | static void zcrypt_cex2a_receive(struct ap_device *ap_dev, | |
261 | struct ap_message *msg, | |
262 | struct ap_message *reply) | |
263 | { | |
264 | static struct error_hdr error_reply = { | |
265 | .type = TYPE82_RSP_CODE, | |
266 | .reply_code = REP82_ERROR_MACHINE_FAILURE, | |
267 | }; | |
268 | struct type80_hdr *t80h = reply->message; | |
269 | int length; | |
270 | ||
271 | /* Copy the reply message to the request message buffer. */ | |
272 | if (IS_ERR(reply)) | |
273 | memcpy(msg->message, &error_reply, sizeof(error_reply)); | |
274 | else if (t80h->type == TYPE80_RSP_CODE) { | |
275 | length = min(CEX2A_MAX_RESPONSE_SIZE, (int) t80h->len); | |
276 | memcpy(msg->message, reply->message, length); | |
277 | } else | |
278 | memcpy(msg->message, reply->message, sizeof error_reply); | |
279 | complete((struct completion *) msg->private); | |
280 | } | |
281 | ||
282 | static atomic_t zcrypt_step = ATOMIC_INIT(0); | |
283 | ||
284 | /** | |
285 | * The request distributor calls this function if it picked the CEX2A | |
286 | * device to handle a modexpo request. | |
287 | * @zdev: pointer to zcrypt_device structure that identifies the | |
288 | * CEX2A device to the request distributor | |
289 | * @mex: pointer to the modexpo request buffer | |
290 | */ | |
291 | static long zcrypt_cex2a_modexpo(struct zcrypt_device *zdev, | |
292 | struct ica_rsa_modexpo *mex) | |
293 | { | |
294 | struct ap_message ap_msg; | |
295 | struct completion work; | |
296 | int rc; | |
297 | ||
5cbded58 | 298 | ap_msg.message = kmalloc(CEX2A_MAX_MESSAGE_SIZE, GFP_KERNEL); |
963ed931 MS |
299 | if (!ap_msg.message) |
300 | return -ENOMEM; | |
301 | ap_msg.psmid = (((unsigned long long) current->pid) << 32) + | |
302 | atomic_inc_return(&zcrypt_step); | |
303 | ap_msg.private = &work; | |
304 | rc = ICAMEX_msg_to_type50MEX_msg(zdev, &ap_msg, mex); | |
305 | if (rc) | |
306 | goto out_free; | |
307 | init_completion(&work); | |
308 | ap_queue_message(zdev->ap_dev, &ap_msg); | |
309 | rc = wait_for_completion_interruptible_timeout( | |
310 | &work, CEX2A_CLEANUP_TIME); | |
311 | if (rc > 0) | |
312 | rc = convert_response(zdev, &ap_msg, mex->outputdata, | |
313 | mex->outputdatalength); | |
314 | else { | |
315 | /* Signal pending or message timed out. */ | |
316 | ap_cancel_message(zdev->ap_dev, &ap_msg); | |
317 | if (rc == 0) | |
318 | /* Message timed out. */ | |
319 | rc = -ETIME; | |
320 | } | |
321 | out_free: | |
322 | kfree(ap_msg.message); | |
323 | return rc; | |
324 | } | |
325 | ||
326 | /** | |
327 | * The request distributor calls this function if it picked the CEX2A | |
328 | * device to handle a modexpo_crt request. | |
329 | * @zdev: pointer to zcrypt_device structure that identifies the | |
330 | * CEX2A device to the request distributor | |
331 | * @crt: pointer to the modexpoc_crt request buffer | |
332 | */ | |
333 | static long zcrypt_cex2a_modexpo_crt(struct zcrypt_device *zdev, | |
334 | struct ica_rsa_modexpo_crt *crt) | |
335 | { | |
336 | struct ap_message ap_msg; | |
337 | struct completion work; | |
338 | int rc; | |
339 | ||
5cbded58 | 340 | ap_msg.message = kmalloc(CEX2A_MAX_MESSAGE_SIZE, GFP_KERNEL); |
963ed931 MS |
341 | if (!ap_msg.message) |
342 | return -ENOMEM; | |
343 | ap_msg.psmid = (((unsigned long long) current->pid) << 32) + | |
344 | atomic_inc_return(&zcrypt_step); | |
345 | ap_msg.private = &work; | |
346 | rc = ICACRT_msg_to_type50CRT_msg(zdev, &ap_msg, crt); | |
347 | if (rc) | |
348 | goto out_free; | |
349 | init_completion(&work); | |
350 | ap_queue_message(zdev->ap_dev, &ap_msg); | |
351 | rc = wait_for_completion_interruptible_timeout( | |
352 | &work, CEX2A_CLEANUP_TIME); | |
353 | if (rc > 0) | |
354 | rc = convert_response(zdev, &ap_msg, crt->outputdata, | |
355 | crt->outputdatalength); | |
356 | else { | |
357 | /* Signal pending or message timed out. */ | |
358 | ap_cancel_message(zdev->ap_dev, &ap_msg); | |
359 | if (rc == 0) | |
360 | /* Message timed out. */ | |
361 | rc = -ETIME; | |
362 | } | |
363 | out_free: | |
364 | kfree(ap_msg.message); | |
365 | return rc; | |
366 | } | |
367 | ||
368 | /** | |
369 | * The crypto operations for a CEX2A card. | |
370 | */ | |
371 | static struct zcrypt_ops zcrypt_cex2a_ops = { | |
372 | .rsa_modexpo = zcrypt_cex2a_modexpo, | |
373 | .rsa_modexpo_crt = zcrypt_cex2a_modexpo_crt, | |
374 | }; | |
375 | ||
376 | /** | |
377 | * Probe function for CEX2A cards. It always accepts the AP device | |
378 | * since the bus_match already checked the hardware type. | |
379 | * @ap_dev: pointer to the AP device. | |
380 | */ | |
381 | static int zcrypt_cex2a_probe(struct ap_device *ap_dev) | |
382 | { | |
383 | struct zcrypt_device *zdev; | |
384 | int rc; | |
385 | ||
386 | zdev = zcrypt_device_alloc(CEX2A_MAX_RESPONSE_SIZE); | |
387 | if (!zdev) | |
388 | return -ENOMEM; | |
389 | zdev->ap_dev = ap_dev; | |
390 | zdev->ops = &zcrypt_cex2a_ops; | |
391 | zdev->online = 1; | |
392 | zdev->user_space_type = ZCRYPT_CEX2A; | |
393 | zdev->type_string = "CEX2A"; | |
394 | zdev->min_mod_size = CEX2A_MIN_MOD_SIZE; | |
395 | zdev->max_mod_size = CEX2A_MAX_MOD_SIZE; | |
396 | zdev->short_crt = 1; | |
397 | zdev->speed_rating = CEX2A_SPEED_RATING; | |
398 | ap_dev->reply = &zdev->reply; | |
399 | ap_dev->private = zdev; | |
400 | rc = zcrypt_device_register(zdev); | |
401 | if (rc) | |
402 | goto out_free; | |
403 | return 0; | |
404 | ||
405 | out_free: | |
406 | ap_dev->private = NULL; | |
407 | zcrypt_device_free(zdev); | |
408 | return rc; | |
409 | } | |
410 | ||
411 | /** | |
412 | * This is called to remove the extended CEX2A driver information | |
413 | * if an AP device is removed. | |
414 | */ | |
415 | static void zcrypt_cex2a_remove(struct ap_device *ap_dev) | |
416 | { | |
417 | struct zcrypt_device *zdev = ap_dev->private; | |
418 | ||
419 | zcrypt_device_unregister(zdev); | |
420 | } | |
421 | ||
422 | int __init zcrypt_cex2a_init(void) | |
423 | { | |
424 | return ap_driver_register(&zcrypt_cex2a_driver, THIS_MODULE, "cex2a"); | |
425 | } | |
426 | ||
427 | void __exit zcrypt_cex2a_exit(void) | |
428 | { | |
429 | ap_driver_unregister(&zcrypt_cex2a_driver); | |
430 | } | |
431 | ||
432 | #ifndef CONFIG_ZCRYPT_MONOLITHIC | |
433 | module_init(zcrypt_cex2a_init); | |
434 | module_exit(zcrypt_cex2a_exit); | |
435 | #endif |