Based on kernel version 4.8. Page generated on 2016-10-06 23:18 EST.
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 }