Documentation/misc-devices/mei/mei-amt-version.c

   1 /******************************************************************************
   2  * Intel Management Engine Interface (Intel MEI) Linux driver
   3  * Intel MEI Interface Header
   4  *
   5  * This file is provided under a dual BSD/GPLv2 license.  When using or
   6  * redistributing this file, you may do so under either license.
   7  *
   8  * GPL LICENSE SUMMARY
   9  *
  10  * Copyright(c) 2012 Intel Corporation. All rights reserved.
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of version 2 of the GNU General Public License as
  14  * published by the Free Software Foundation.
  15  *
  16  * This program is distributed in the hope that it will be useful, but
  17  * WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19  * General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
  24  * USA
  25  *
  26  * The full GNU General Public License is included in this distribution
  27  * in the file called LICENSE.GPL.
  28  *
  29  * Contact Information:
  30  *      Intel Corporation.
  31  *      linux-mei@linux.intel.com
  32  *      http://www.intel.com
  33  *
  34  * BSD LICENSE
  35  *
  36  * Copyright(c) 2003 - 2012 Intel Corporation. All rights reserved.
  37  * All rights reserved.
  38  *
  39  * Redistribution and use in source and binary forms, with or without
  40  * modification, are permitted provided that the following conditions
  41  * are met:
  42  *
  43  *  * Redistributions of source code must retain the above copyright
  44  *    notice, this list of conditions and the following disclaimer.
  45  *  * Redistributions in binary form must reproduce the above copyright
  46  *    notice, this list of conditions and the following disclaimer in
  47  *    the documentation and/or other materials provided with the
  48  *    distribution.
  49  *  * Neither the name Intel Corporation nor the names of its
  50  *    contributors may be used to endorse or promote products derived
  51  *    from this software without specific prior written permission.
  52  *
  53  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  54  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  55  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  56  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  57  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  58  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  59  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  60  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  61  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  62  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  63  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  64  *
  65  *****************************************************************************/
  66
  67 #include <stdio.h>
  68 #include <stdlib.h>
  69 #include <string.h>
  70 #include <fcntl.h>
  71 #include <sys/ioctl.h>
  72 #include <unistd.h>
  73 #include <errno.h>
  74 #include <stdint.h>
  75 #include <stdbool.h>
  76 #include <bits/wordsize.h>
  77 #include <linux/mei.h>
  78
  79 /*****************************************************************************
  80  * Intel Management Engine Interface
  81  *****************************************************************************/
  82
  83 #define mei_msg(_me, fmt, ARGS...) do {         \
  84         if (_me->verbose)                       \
  85                 fprintf(stderr, fmt, ##ARGS);   \
  86 } while (0)
  87
  88 #define mei_err(_me, fmt, ARGS...) do {         \
  89         fprintf(stderr, "Error: " fmt, ##ARGS); \
  90 } while (0)
  91
  92 struct mei {
  93         uuid_le guid;
  94         bool initialized;
  95         bool verbose;
  96         unsigned int buf_size;
  97         unsigned char prot_ver;
  98         int fd;
  99 };
 100
 101 static void mei_deinit(struct mei *cl)
 102 {
 103         if (cl->fd != -1)
 104                 close(cl->fd);
 105         cl->fd = -1;
 106         cl->buf_size = 0;
 107         cl->prot_ver = 0;
 108         cl->initialized = false;
 109 }
 110
 111 static bool mei_init(struct mei *me, const uuid_le *guid,
 112                 unsigned char req_protocol_version, bool verbose)
 113 {
 114         int result;
 115         struct mei_client *cl;
 116         struct mei_connect_client_data data;
 117
 118         me->verbose = verbose;
 119
 120         me->fd = open("/dev/mei", O_RDWR);
 121         if (me->fd == -1) {
 122                 mei_err(me, "Cannot establish a handle to the Intel MEI driver\n");
 123                 goto err;
 124         }
 125         memcpy(&me->guid, guid, sizeof(*guid));
 126         memset(&data, 0, sizeof(data));
 127         me->initialized = true;
 128
 129         memcpy(&data.in_client_uuid, &me->guid, sizeof(me->guid));
 130         result = ioctl(me->fd, IOCTL_MEI_CONNECT_CLIENT, &data);
 131         if (result) {
 132                 mei_err(me, "IOCTL_MEI_CONNECT_CLIENT receive message. err=%d\n", result);
 133                 goto err;
 134         }
 135         cl = &data.out_client_properties;
 136         mei_msg(me, "max_message_length %d\n", cl->max_msg_length);
 137         mei_msg(me, "protocol_version %d\n", cl->protocol_version);
 138
 139         if ((req_protocol_version > 0) &&
 140              (cl->protocol_version != req_protocol_version)) {
 141                 mei_err(me, "Intel MEI protocol version not supported\n");
 142                 goto err;
 143         }
 144
 145         me->buf_size = cl->max_msg_length;
 146         me->prot_ver = cl->protocol_version;
 147
 148         return true;
 149 err:
 150         mei_deinit(me);
 151         return false;
 152 }
 153
 154 static ssize_t mei_recv_msg(struct mei *me, unsigned char *buffer,
 155                         ssize_t len, unsigned long timeout)
 156 {
 157         ssize_t rc;
 158
 159         mei_msg(me, "call read length = %zd\n", len);
 160
 161         rc = read(me->fd, buffer, len);
 162         if (rc < 0) {
 163                 mei_err(me, "read failed with status %zd %s\n",
 164                                 rc, strerror(errno));
 165                 mei_deinit(me);
 166         } else {
 167                 mei_msg(me, "read succeeded with result %zd\n", rc);
 168         }
 169         return rc;
 170 }
 171
 172 static ssize_t mei_send_msg(struct mei *me, const unsigned char *buffer,
 173                         ssize_t len, unsigned long timeout)
 174 {
 175         struct timeval tv;
 176         ssize_t written;
 177         ssize_t rc;
 178         fd_set set;
 179
 180         tv.tv_sec = timeout / 1000;
 181         tv.tv_usec = (timeout % 1000) * 1000000;
 182
 183         mei_msg(me, "call write length = %zd\n", len);
 184
 185         written = write(me->fd, buffer, len);
 186         if (written < 0) {
 187                 rc = -errno;
 188                 mei_err(me, "write failed with status %zd %s\n",
 189                         written, strerror(errno));
 190                 goto out;
 191         }
 192
 193         FD_ZERO(&set);
 194         FD_SET(me->fd, &set);
 195         rc = select(me->fd + 1 , &set, NULL, NULL, &tv);
 196         if (rc > 0 && FD_ISSET(me->fd, &set)) {
 197                 mei_msg(me, "write success\n");
 198         } else if (rc == 0) {
 199                 mei_err(me, "write failed on timeout with status\n");
 200                 goto out;
 201         } else { /* rc < 0 */
 202                 mei_err(me, "write failed on select with status %zd\n", rc);
 203                 goto out;
 204         }
 205
 206         rc = written;
 207 out:
 208         if (rc < 0)
 209                 mei_deinit(me);
 210
 211         return rc;
 212 }
 213
 214 /***************************************************************************
 215  * Intel Advanced Management Technology ME Client
 216  ***************************************************************************/
 217
 218 #define AMT_MAJOR_VERSION 1
 219 #define AMT_MINOR_VERSION 1
 220
 221 #define AMT_STATUS_SUCCESS                0x0
 222 #define AMT_STATUS_INTERNAL_ERROR         0x1
 223 #define AMT_STATUS_NOT_READY              0x2
 224 #define AMT_STATUS_INVALID_AMT_MODE       0x3
 225 #define AMT_STATUS_INVALID_MESSAGE_LENGTH 0x4
 226
 227 #define AMT_STATUS_HOST_IF_EMPTY_RESPONSE  0x4000
 228 #define AMT_STATUS_SDK_RESOURCES      0x1004
 229
 230
 231 #define AMT_BIOS_VERSION_LEN   65
 232 #define AMT_VERSIONS_NUMBER    50
 233 #define AMT_UNICODE_STRING_LEN 20
 234
 235 struct amt_unicode_string {
 236         uint16_t length;
 237         char string[AMT_UNICODE_STRING_LEN];
 238 } __attribute__((packed));
 239
 240 struct amt_version_type {
 241         struct amt_unicode_string description;
 242         struct amt_unicode_string version;
 243 } __attribute__((packed));
 244
 245 struct amt_version {
 246         uint8_t major;
 247         uint8_t minor;
 248 } __attribute__((packed));
 249
 250 struct amt_code_versions {
 251         uint8_t bios[AMT_BIOS_VERSION_LEN];
 252         uint32_t count;
 253         struct amt_version_type versions[AMT_VERSIONS_NUMBER];
 254 } __attribute__((packed));
 255
 256 /***************************************************************************
 257  * Intel Advanced Management Technology Host Interface
 258  ***************************************************************************/
 259
 260 struct amt_host_if_msg_header {
 261         struct amt_version version;
 262         uint16_t _reserved;
 263         uint32_t command;
 264         uint32_t length;
 265 } __attribute__((packed));
 266
 267 struct amt_host_if_resp_header {
 268         struct amt_host_if_msg_header header;
 269         uint32_t status;
 270         unsigned char data[0];
 271 } __attribute__((packed));
 272
 273 const uuid_le MEI_IAMTHIF = UUID_LE(0x12f80028, 0xb4b7, 0x4b2d,  \
 274                                 0xac, 0xa8, 0x46, 0xe0, 0xff, 0x65, 0x81, 0x4c);
 275
 276 #define AMT_HOST_IF_CODE_VERSIONS_REQUEST  0x0400001A
 277 #define AMT_HOST_IF_CODE_VERSIONS_RESPONSE 0x0480001A
 278
 279 const struct amt_host_if_msg_header CODE_VERSION_REQ = {
 280         .version = {AMT_MAJOR_VERSION, AMT_MINOR_VERSION},
 281         ._reserved = 0,
 282         .command = AMT_HOST_IF_CODE_VERSIONS_REQUEST,
 283         .length = 0
 284 };
 285
 286
 287 struct amt_host_if {
 288         struct mei mei_cl;
 289         unsigned long send_timeout;
 290         bool initialized;
 291 };
 292
 293
 294 static bool amt_host_if_init(struct amt_host_if *acmd,
 295                       unsigned long send_timeout, bool verbose)
 296 {
 297         acmd->send_timeout = (send_timeout) ? send_timeout : 20000;
 298         acmd->initialized = mei_init(&acmd->mei_cl, &MEI_IAMTHIF, 0, verbose);
 299         return acmd->initialized;
 300 }
 301
 302 static void amt_host_if_deinit(struct amt_host_if *acmd)
 303 {
 304         mei_deinit(&acmd->mei_cl);
 305         acmd->initialized = false;
 306 }
 307
 308 static uint32_t amt_verify_code_versions(const struct amt_host_if_resp_header *resp)
 309 {
 310         uint32_t status = AMT_STATUS_SUCCESS;
 311         struct amt_code_versions *code_ver;
 312         size_t code_ver_len;
 313         uint32_t ver_type_cnt;
 314         uint32_t len;
 315         uint32_t i;
 316
 317         code_ver = (struct amt_code_versions *)resp->data;
 318         /* length - sizeof(status) */
 319         code_ver_len = resp->header.length - sizeof(uint32_t);
 320         ver_type_cnt = code_ver_len -
 321                         sizeof(code_ver->bios) -
 322                         sizeof(code_ver->count);
 323         if (code_ver->count != ver_type_cnt / sizeof(struct amt_version_type)) {
 324                 status = AMT_STATUS_INTERNAL_ERROR;
 325                 goto out;
 326         }
 327
 328         for (i = 0; i < code_ver->count; i++) {
 329                 len = code_ver->versions[i].description.length;
 330
 331                 if (len > AMT_UNICODE_STRING_LEN) {
 332                         status = AMT_STATUS_INTERNAL_ERROR;
 333                         goto out;
 334                 }
 335
 336                 len = code_ver->versions[i].version.length;
 337                 if (code_ver->versions[i].version.string[len] != '\0' ||
 338                     len != strlen(code_ver->versions[i].version.string)) {
 339                         status = AMT_STATUS_INTERNAL_ERROR;
 340                         goto out;
 341                 }
 342         }
 343 out:
 344         return status;
 345 }
 346
 347 static uint32_t amt_verify_response_header(uint32_t command,
 348                                 const struct amt_host_if_msg_header *resp_hdr,
 349                                 uint32_t response_size)
 350 {
 351         if (response_size < sizeof(struct amt_host_if_resp_header)) {
 352                 return AMT_STATUS_INTERNAL_ERROR;
 353         } else if (response_size != (resp_hdr->length +
 354                                 sizeof(struct amt_host_if_msg_header))) {
 355                 return AMT_STATUS_INTERNAL_ERROR;
 356         } else if (resp_hdr->command != command) {
 357                 return AMT_STATUS_INTERNAL_ERROR;
 358         } else if (resp_hdr->_reserved != 0) {
 359                 return AMT_STATUS_INTERNAL_ERROR;
 360         } else if (resp_hdr->version.major != AMT_MAJOR_VERSION ||
 361                    resp_hdr->version.minor < AMT_MINOR_VERSION) {
 362                 return AMT_STATUS_INTERNAL_ERROR;
 363         }
 364         return AMT_STATUS_SUCCESS;
 365 }
 366
 367 static uint32_t amt_host_if_call(struct amt_host_if *acmd,
 368                         const unsigned char *command, ssize_t command_sz,
 369                         uint8_t **read_buf, uint32_t rcmd,
 370                         unsigned int expected_sz)
 371 {
 372         uint32_t in_buf_sz;
 373         uint32_t out_buf_sz;
 374         ssize_t written;
 375         uint32_t status;
 376         struct amt_host_if_resp_header *msg_hdr;
 377
 378         in_buf_sz = acmd->mei_cl.buf_size;
 379         *read_buf = (uint8_t *)malloc(sizeof(uint8_t) * in_buf_sz);
 380         if (*read_buf == NULL)
 381                 return AMT_STATUS_SDK_RESOURCES;
 382         memset(*read_buf, 0, in_buf_sz);
 383         msg_hdr = (struct amt_host_if_resp_header *)*read_buf;
 384
 385         written = mei_send_msg(&acmd->mei_cl,
 386                                 command, command_sz, acmd->send_timeout);
 387         if (written != command_sz)
 388                 return AMT_STATUS_INTERNAL_ERROR;
 389
 390         out_buf_sz = mei_recv_msg(&acmd->mei_cl, *read_buf, in_buf_sz, 2000);
 391         if (out_buf_sz <= 0)
 392                 return AMT_STATUS_HOST_IF_EMPTY_RESPONSE;
 393
 394         status = msg_hdr->status;
 395         if (status != AMT_STATUS_SUCCESS)
 396                 return status;
 397
 398         status = amt_verify_response_header(rcmd,
 399                                 &msg_hdr->header, out_buf_sz);
 400         if (status != AMT_STATUS_SUCCESS)
 401                 return status;
 402
 403         if (expected_sz && expected_sz != out_buf_sz)
 404                 return AMT_STATUS_INTERNAL_ERROR;
 405
 406         return AMT_STATUS_SUCCESS;
 407 }
 408
 409
 410 static uint32_t amt_get_code_versions(struct amt_host_if *cmd,
 411                                struct amt_code_versions *versions)
 412 {
 413         struct amt_host_if_resp_header *response = NULL;
 414         uint32_t status;
 415
 416         status = amt_host_if_call(cmd,
 417                         (const unsigned char *)&CODE_VERSION_REQ,
 418                         sizeof(CODE_VERSION_REQ),
 419                         (uint8_t **)&response,
 420                         AMT_HOST_IF_CODE_VERSIONS_RESPONSE, 0);
 421
 422         if (status != AMT_STATUS_SUCCESS)
 423                 goto out;
 424
 425         status = amt_verify_code_versions(response);
 426         if (status != AMT_STATUS_SUCCESS)
 427                 goto out;
 428
 429         memcpy(versions, response->data, sizeof(struct amt_code_versions));
 430 out:
 431         if (response != NULL)
 432                 free(response);
 433
 434         return status;
 435 }
 436
 437 /************************** end of amt_host_if_command ***********************/
 438 int main(int argc, char **argv)
 439 {
 440         struct amt_code_versions ver;
 441         struct amt_host_if acmd;
 442         unsigned int i;
 443         uint32_t status;
 444         int ret;
 445         bool verbose;
 446
 447         verbose = (argc > 1 && strcmp(argv[1], "-v") == 0);
 448
 449         if (!amt_host_if_init(&acmd, 5000, verbose)) {
 450                 ret = 1;
 451                 goto out;
 452         }
 453
 454         status = amt_get_code_versions(&acmd, &ver);
 455
 456         amt_host_if_deinit(&acmd);
 457
 458         switch (status) {
 459         case AMT_STATUS_HOST_IF_EMPTY_RESPONSE:
 460                 printf("Intel AMT: DISABLED\n");
 461                 ret = 0;
 462                 break;
 463         case AMT_STATUS_SUCCESS:
 464                 printf("Intel AMT: ENABLED\n");
 465                 for (i = 0; i < ver.count; i++) {
 466                         printf("%s:\t%s\n", ver.versions[i].description.string,
 467                                 ver.versions[i].version.string);
 468                 }
 469                 ret = 0;
 470                 break;
 471         default:
 472                 printf("An error has occurred\n");
 473                 ret = 1;
 474                 break;
 475         }
 476
 477 out:
 478         return ret;
 479 }