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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
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 zdev->max_exp_bit_length = PCICA_MAX_MOD_SIZE;
377 ap_dev->reply = &zdev->reply;
378 ap_dev->private = zdev;
379 rc = zcrypt_device_register(zdev);
380 if (rc)
381 goto out_free;
382 return 0;
383
384out_free:
385 ap_dev->private = NULL;
386 zcrypt_device_free(zdev);
387 return rc;
388}
389
390/**
391 * This is called to remove the extended PCICA driver information
392 * if an AP device is removed.
393 */
394static void zcrypt_pcica_remove(struct ap_device *ap_dev)
395{
396 struct zcrypt_device *zdev = ap_dev->private;
397
398 zcrypt_device_unregister(zdev);
399}
400
401int __init zcrypt_pcica_init(void)
402{
403 return ap_driver_register(&zcrypt_pcica_driver, THIS_MODULE, "pcica");
404}
405
406void zcrypt_pcica_exit(void)
407{
408 ap_driver_unregister(&zcrypt_pcica_driver);
409}
410
411#ifndef CONFIG_ZCRYPT_MONOLITHIC
412module_init(zcrypt_pcica_init);
413module_exit(zcrypt_pcica_exit);
414#endif