1 /* 2 * Copyright 2007-2010 Red Hat, Inc. 3 * by Peter Jones <pjones@redhat.com> 4 * Copyright 2008 IBM, Inc. 5 * by Konrad Rzeszutek <konradr@linux.vnet.ibm.com> 6 * Copyright 2008 7 * by Konrad Rzeszutek <ketuzsezr@darnok.org> 8 * 9 * This code exposes the iSCSI Boot Format Table to userland via sysfs. 10 * 11 * This program is free software; you can redistribute it and/or modify 12 * it under the terms of the GNU General Public License v2.0 as published by 13 * the Free Software Foundation 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU General Public License for more details. 19 * 20 * Changelog: 21 * 22 * 06 Jan 2010 - Peter Jones <pjones@redhat.com> 23 * New changelog entries are in the git log from now on. Not here. 24 * 25 * 14 Mar 2008 - Konrad Rzeszutek <ketuzsezr@darnok.org> 26 * Updated comments and copyrights. (v0.4.9) 27 * 28 * 11 Feb 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com> 29 * Converted to using ibft_addr. (v0.4.8) 30 * 31 * 8 Feb 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com> 32 * Combined two functions in one: reserve_ibft_region. (v0.4.7) 33 * 34 * 30 Jan 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com> 35 * Added logic to handle IPv6 addresses. (v0.4.6) 36 * 37 * 25 Jan 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com> 38 * Added logic to handle badly not-to-spec iBFT. (v0.4.5) 39 * 40 * 4 Jan 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com> 41 * Added __init to function declarations. (v0.4.4) 42 * 43 * 21 Dec 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com> 44 * Updated kobject registration, combined unregister functions in one 45 * and code and style cleanup. (v0.4.3) 46 * 47 * 5 Dec 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com> 48 * Added end-markers to enums and re-organized kobject registration. (v0.4.2) 49 * 50 * 4 Dec 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com> 51 * Created 'device' sysfs link to the NIC and style cleanup. (v0.4.1) 52 * 53 * 28 Nov 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com> 54 * Added sysfs-ibft documentation, moved 'find_ibft' function to 55 * in its own file and added text attributes for every struct field. (v0.4) 56 * 57 * 21 Nov 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com> 58 * Added text attributes emulating OpenFirmware /proc/device-tree naming. 59 * Removed binary /sysfs interface (v0.3) 60 * 61 * 29 Aug 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com> 62 * Added functionality in setup.c to reserve iBFT region. (v0.2) 63 * 64 * 27 Aug 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com> 65 * First version exposing iBFT data via a binary /sysfs. (v0.1) 66 * 67 */ 68 69 70 #include <linux/blkdev.h> 71 #include <linux/capability.h> 72 #include <linux/ctype.h> 73 #include <linux/device.h> 74 #include <linux/err.h> 75 #include <linux/init.h> 76 #include <linux/iscsi_ibft.h> 77 #include <linux/limits.h> 78 #include <linux/module.h> 79 #include <linux/pci.h> 80 #include <linux/slab.h> 81 #include <linux/stat.h> 82 #include <linux/string.h> 83 #include <linux/types.h> 84 #include <linux/acpi.h> 85 #include <linux/iscsi_boot_sysfs.h> 86 87 #define IBFT_ISCSI_VERSION "0.5.0" 88 #define IBFT_ISCSI_DATE "2010-Feb-25" 89 90 MODULE_AUTHOR("Peter Jones <pjones@redhat.com> and " 91 "Konrad Rzeszutek <ketuzsezr@darnok.org>"); 92 MODULE_DESCRIPTION("sysfs interface to BIOS iBFT information"); 93 MODULE_LICENSE("GPL"); 94 MODULE_VERSION(IBFT_ISCSI_VERSION); 95 96 struct ibft_hdr { 97 u8 id; 98 u8 version; 99 u16 length; 100 u8 index; 101 u8 flags; 102 } __attribute__((__packed__)); 103 104 struct ibft_control { 105 struct ibft_hdr hdr; 106 u16 extensions; 107 u16 initiator_off; 108 u16 nic0_off; 109 u16 tgt0_off; 110 u16 nic1_off; 111 u16 tgt1_off; 112 } __attribute__((__packed__)); 113 114 struct ibft_initiator { 115 struct ibft_hdr hdr; 116 char isns_server[16]; 117 char slp_server[16]; 118 char pri_radius_server[16]; 119 char sec_radius_server[16]; 120 u16 initiator_name_len; 121 u16 initiator_name_off; 122 } __attribute__((__packed__)); 123 124 struct ibft_nic { 125 struct ibft_hdr hdr; 126 char ip_addr[16]; 127 u8 subnet_mask_prefix; 128 u8 origin; 129 char gateway[16]; 130 char primary_dns[16]; 131 char secondary_dns[16]; 132 char dhcp[16]; 133 u16 vlan; 134 char mac[6]; 135 u16 pci_bdf; 136 u16 hostname_len; 137 u16 hostname_off; 138 } __attribute__((__packed__)); 139 140 struct ibft_tgt { 141 struct ibft_hdr hdr; 142 char ip_addr[16]; 143 u16 port; 144 char lun[8]; 145 u8 chap_type; 146 u8 nic_assoc; 147 u16 tgt_name_len; 148 u16 tgt_name_off; 149 u16 chap_name_len; 150 u16 chap_name_off; 151 u16 chap_secret_len; 152 u16 chap_secret_off; 153 u16 rev_chap_name_len; 154 u16 rev_chap_name_off; 155 u16 rev_chap_secret_len; 156 u16 rev_chap_secret_off; 157 } __attribute__((__packed__)); 158 159 /* 160 * The kobject different types and its names. 161 * 162 */ 163 enum ibft_id { 164 id_reserved = 0, /* We don't support. */ 165 id_control = 1, /* Should show up only once and is not exported. */ 166 id_initiator = 2, 167 id_nic = 3, 168 id_target = 4, 169 id_extensions = 5, /* We don't support. */ 170 id_end_marker, 171 }; 172 173 /* 174 * The kobject and attribute structures. 175 */ 176 177 struct ibft_kobject { 178 struct acpi_table_ibft *header; 179 union { 180 struct ibft_initiator *initiator; 181 struct ibft_nic *nic; 182 struct ibft_tgt *tgt; 183 struct ibft_hdr *hdr; 184 }; 185 }; 186 187 static struct iscsi_boot_kset *boot_kset; 188 189 static const char nulls[16]; 190 191 /* 192 * Helper functions to parse data properly. 193 */ 194 static ssize_t sprintf_ipaddr(char *buf, u8 *ip) 195 { 196 char *str = buf; 197 198 if (ip[0] == 0 && ip[1] == 0 && ip[2] == 0 && ip[3] == 0 && 199 ip[4] == 0 && ip[5] == 0 && ip[6] == 0 && ip[7] == 0 && 200 ip[8] == 0 && ip[9] == 0 && ip[10] == 0xff && ip[11] == 0xff) { 201 /* 202 * IPV4 203 */ 204 str += sprintf(buf, "%pI4", ip + 12); 205 } else { 206 /* 207 * IPv6 208 */ 209 str += sprintf(str, "%pI6", ip); 210 } 211 str += sprintf(str, "\n"); 212 return str - buf; 213 } 214 215 static ssize_t sprintf_string(char *str, int len, char *buf) 216 { 217 return sprintf(str, "%.*s\n", len, buf); 218 } 219 220 /* 221 * Helper function to verify the IBFT header. 222 */ 223 static int ibft_verify_hdr(char *t, struct ibft_hdr *hdr, int id, int length) 224 { 225 if (hdr->id != id) { 226 printk(KERN_ERR "iBFT error: We expected the %s " \ 227 "field header.id to have %d but " \ 228 "found %d instead!\n", t, id, hdr->id); 229 return -ENODEV; 230 } 231 if (hdr->length != length) { 232 printk(KERN_ERR "iBFT error: We expected the %s " \ 233 "field header.length to have %d but " \ 234 "found %d instead!\n", t, length, hdr->length); 235 return -ENODEV; 236 } 237 238 return 0; 239 } 240 241 /* 242 * Routines for parsing the iBFT data to be human readable. 243 */ 244 static ssize_t ibft_attr_show_initiator(void *data, int type, char *buf) 245 { 246 struct ibft_kobject *entry = data; 247 struct ibft_initiator *initiator = entry->initiator; 248 void *ibft_loc = entry->header; 249 char *str = buf; 250 251 if (!initiator) 252 return 0; 253 254 switch (type) { 255 case ISCSI_BOOT_INI_INDEX: 256 str += sprintf(str, "%d\n", initiator->hdr.index); 257 break; 258 case ISCSI_BOOT_INI_FLAGS: 259 str += sprintf(str, "%d\n", initiator->hdr.flags); 260 break; 261 case ISCSI_BOOT_INI_ISNS_SERVER: 262 str += sprintf_ipaddr(str, initiator->isns_server); 263 break; 264 case ISCSI_BOOT_INI_SLP_SERVER: 265 str += sprintf_ipaddr(str, initiator->slp_server); 266 break; 267 case ISCSI_BOOT_INI_PRI_RADIUS_SERVER: 268 str += sprintf_ipaddr(str, initiator->pri_radius_server); 269 break; 270 case ISCSI_BOOT_INI_SEC_RADIUS_SERVER: 271 str += sprintf_ipaddr(str, initiator->sec_radius_server); 272 break; 273 case ISCSI_BOOT_INI_INITIATOR_NAME: 274 str += sprintf_string(str, initiator->initiator_name_len, 275 (char *)ibft_loc + 276 initiator->initiator_name_off); 277 break; 278 default: 279 break; 280 } 281 282 return str - buf; 283 } 284 285 static ssize_t ibft_attr_show_nic(void *data, int type, char *buf) 286 { 287 struct ibft_kobject *entry = data; 288 struct ibft_nic *nic = entry->nic; 289 void *ibft_loc = entry->header; 290 char *str = buf; 291 __be32 val; 292 293 if (!nic) 294 return 0; 295 296 switch (type) { 297 case ISCSI_BOOT_ETH_INDEX: 298 str += sprintf(str, "%d\n", nic->hdr.index); 299 break; 300 case ISCSI_BOOT_ETH_FLAGS: 301 str += sprintf(str, "%d\n", nic->hdr.flags); 302 break; 303 case ISCSI_BOOT_ETH_IP_ADDR: 304 str += sprintf_ipaddr(str, nic->ip_addr); 305 break; 306 case ISCSI_BOOT_ETH_SUBNET_MASK: 307 val = cpu_to_be32(~((1 << (32-nic->subnet_mask_prefix))-1)); 308 str += sprintf(str, "%pI4", &val); 309 break; 310 case ISCSI_BOOT_ETH_ORIGIN: 311 str += sprintf(str, "%d\n", nic->origin); 312 break; 313 case ISCSI_BOOT_ETH_GATEWAY: 314 str += sprintf_ipaddr(str, nic->gateway); 315 break; 316 case ISCSI_BOOT_ETH_PRIMARY_DNS: 317 str += sprintf_ipaddr(str, nic->primary_dns); 318 break; 319 case ISCSI_BOOT_ETH_SECONDARY_DNS: 320 str += sprintf_ipaddr(str, nic->secondary_dns); 321 break; 322 case ISCSI_BOOT_ETH_DHCP: 323 str += sprintf_ipaddr(str, nic->dhcp); 324 break; 325 case ISCSI_BOOT_ETH_VLAN: 326 str += sprintf(str, "%d\n", nic->vlan); 327 break; 328 case ISCSI_BOOT_ETH_MAC: 329 str += sprintf(str, "%pM\n", nic->mac); 330 break; 331 case ISCSI_BOOT_ETH_HOSTNAME: 332 str += sprintf_string(str, nic->hostname_len, 333 (char *)ibft_loc + nic->hostname_off); 334 break; 335 default: 336 break; 337 } 338 339 return str - buf; 340 }; 341 342 static ssize_t ibft_attr_show_target(void *data, int type, char *buf) 343 { 344 struct ibft_kobject *entry = data; 345 struct ibft_tgt *tgt = entry->tgt; 346 void *ibft_loc = entry->header; 347 char *str = buf; 348 int i; 349 350 if (!tgt) 351 return 0; 352 353 switch (type) { 354 case ISCSI_BOOT_TGT_INDEX: 355 str += sprintf(str, "%d\n", tgt->hdr.index); 356 break; 357 case ISCSI_BOOT_TGT_FLAGS: 358 str += sprintf(str, "%d\n", tgt->hdr.flags); 359 break; 360 case ISCSI_BOOT_TGT_IP_ADDR: 361 str += sprintf_ipaddr(str, tgt->ip_addr); 362 break; 363 case ISCSI_BOOT_TGT_PORT: 364 str += sprintf(str, "%d\n", tgt->port); 365 break; 366 case ISCSI_BOOT_TGT_LUN: 367 for (i = 0; i < 8; i++) 368 str += sprintf(str, "%x", (u8)tgt->lun[i]); 369 str += sprintf(str, "\n"); 370 break; 371 case ISCSI_BOOT_TGT_NIC_ASSOC: 372 str += sprintf(str, "%d\n", tgt->nic_assoc); 373 break; 374 case ISCSI_BOOT_TGT_CHAP_TYPE: 375 str += sprintf(str, "%d\n", tgt->chap_type); 376 break; 377 case ISCSI_BOOT_TGT_NAME: 378 str += sprintf_string(str, tgt->tgt_name_len, 379 (char *)ibft_loc + tgt->tgt_name_off); 380 break; 381 case ISCSI_BOOT_TGT_CHAP_NAME: 382 str += sprintf_string(str, tgt->chap_name_len, 383 (char *)ibft_loc + tgt->chap_name_off); 384 break; 385 case ISCSI_BOOT_TGT_CHAP_SECRET: 386 str += sprintf_string(str, tgt->chap_secret_len, 387 (char *)ibft_loc + tgt->chap_secret_off); 388 break; 389 case ISCSI_BOOT_TGT_REV_CHAP_NAME: 390 str += sprintf_string(str, tgt->rev_chap_name_len, 391 (char *)ibft_loc + 392 tgt->rev_chap_name_off); 393 break; 394 case ISCSI_BOOT_TGT_REV_CHAP_SECRET: 395 str += sprintf_string(str, tgt->rev_chap_secret_len, 396 (char *)ibft_loc + 397 tgt->rev_chap_secret_off); 398 break; 399 default: 400 break; 401 } 402 403 return str - buf; 404 } 405 406 static int __init ibft_check_device(void) 407 { 408 int len; 409 u8 *pos; 410 u8 csum = 0; 411 412 len = ibft_addr->header.length; 413 414 /* Sanity checking of iBFT. */ 415 if (ibft_addr->header.revision != 1) { 416 printk(KERN_ERR "iBFT module supports only revision 1, " \ 417 "while this is %d.\n", 418 ibft_addr->header.revision); 419 return -ENOENT; 420 } 421 for (pos = (u8 *)ibft_addr; pos < (u8 *)ibft_addr + len; pos++) 422 csum += *pos; 423 424 if (csum) { 425 printk(KERN_ERR "iBFT has incorrect checksum (0x%x)!\n", csum); 426 return -ENOENT; 427 } 428 429 return 0; 430 } 431 432 /* 433 * Helper routiners to check to determine if the entry is valid 434 * in the proper iBFT structure. 435 */ 436 static umode_t ibft_check_nic_for(void *data, int type) 437 { 438 struct ibft_kobject *entry = data; 439 struct ibft_nic *nic = entry->nic; 440 umode_t rc = 0; 441 442 switch (type) { 443 case ISCSI_BOOT_ETH_INDEX: 444 case ISCSI_BOOT_ETH_FLAGS: 445 rc = S_IRUGO; 446 break; 447 case ISCSI_BOOT_ETH_IP_ADDR: 448 if (memcmp(nic->ip_addr, nulls, sizeof(nic->ip_addr))) 449 rc = S_IRUGO; 450 break; 451 case ISCSI_BOOT_ETH_SUBNET_MASK: 452 if (nic->subnet_mask_prefix) 453 rc = S_IRUGO; 454 break; 455 case ISCSI_BOOT_ETH_ORIGIN: 456 rc = S_IRUGO; 457 break; 458 case ISCSI_BOOT_ETH_GATEWAY: 459 if (memcmp(nic->gateway, nulls, sizeof(nic->gateway))) 460 rc = S_IRUGO; 461 break; 462 case ISCSI_BOOT_ETH_PRIMARY_DNS: 463 if (memcmp(nic->primary_dns, nulls, 464 sizeof(nic->primary_dns))) 465 rc = S_IRUGO; 466 break; 467 case ISCSI_BOOT_ETH_SECONDARY_DNS: 468 if (memcmp(nic->secondary_dns, nulls, 469 sizeof(nic->secondary_dns))) 470 rc = S_IRUGO; 471 break; 472 case ISCSI_BOOT_ETH_DHCP: 473 if (memcmp(nic->dhcp, nulls, sizeof(nic->dhcp))) 474 rc = S_IRUGO; 475 break; 476 case ISCSI_BOOT_ETH_VLAN: 477 case ISCSI_BOOT_ETH_MAC: 478 rc = S_IRUGO; 479 break; 480 case ISCSI_BOOT_ETH_HOSTNAME: 481 if (nic->hostname_off) 482 rc = S_IRUGO; 483 break; 484 default: 485 break; 486 } 487 488 return rc; 489 } 490 491 static umode_t __init ibft_check_tgt_for(void *data, int type) 492 { 493 struct ibft_kobject *entry = data; 494 struct ibft_tgt *tgt = entry->tgt; 495 umode_t rc = 0; 496 497 switch (type) { 498 case ISCSI_BOOT_TGT_INDEX: 499 case ISCSI_BOOT_TGT_FLAGS: 500 case ISCSI_BOOT_TGT_IP_ADDR: 501 case ISCSI_BOOT_TGT_PORT: 502 case ISCSI_BOOT_TGT_LUN: 503 case ISCSI_BOOT_TGT_NIC_ASSOC: 504 case ISCSI_BOOT_TGT_CHAP_TYPE: 505 rc = S_IRUGO; 506 case ISCSI_BOOT_TGT_NAME: 507 if (tgt->tgt_name_len) 508 rc = S_IRUGO; 509 break; 510 case ISCSI_BOOT_TGT_CHAP_NAME: 511 case ISCSI_BOOT_TGT_CHAP_SECRET: 512 if (tgt->chap_name_len) 513 rc = S_IRUGO; 514 break; 515 case ISCSI_BOOT_TGT_REV_CHAP_NAME: 516 case ISCSI_BOOT_TGT_REV_CHAP_SECRET: 517 if (tgt->rev_chap_name_len) 518 rc = S_IRUGO; 519 break; 520 default: 521 break; 522 } 523 524 return rc; 525 } 526 527 static umode_t __init ibft_check_initiator_for(void *data, int type) 528 { 529 struct ibft_kobject *entry = data; 530 struct ibft_initiator *init = entry->initiator; 531 umode_t rc = 0; 532 533 switch (type) { 534 case ISCSI_BOOT_INI_INDEX: 535 case ISCSI_BOOT_INI_FLAGS: 536 rc = S_IRUGO; 537 break; 538 case ISCSI_BOOT_INI_ISNS_SERVER: 539 if (memcmp(init->isns_server, nulls, 540 sizeof(init->isns_server))) 541 rc = S_IRUGO; 542 break; 543 case ISCSI_BOOT_INI_SLP_SERVER: 544 if (memcmp(init->slp_server, nulls, 545 sizeof(init->slp_server))) 546 rc = S_IRUGO; 547 break; 548 case ISCSI_BOOT_INI_PRI_RADIUS_SERVER: 549 if (memcmp(init->pri_radius_server, nulls, 550 sizeof(init->pri_radius_server))) 551 rc = S_IRUGO; 552 break; 553 case ISCSI_BOOT_INI_SEC_RADIUS_SERVER: 554 if (memcmp(init->sec_radius_server, nulls, 555 sizeof(init->sec_radius_server))) 556 rc = S_IRUGO; 557 break; 558 case ISCSI_BOOT_INI_INITIATOR_NAME: 559 if (init->initiator_name_len) 560 rc = S_IRUGO; 561 break; 562 default: 563 break; 564 } 565 566 return rc; 567 } 568 569 static void ibft_kobj_release(void *data) 570 { 571 kfree(data); 572 } 573 574 /* 575 * Helper function for ibft_register_kobjects. 576 */ 577 static int __init ibft_create_kobject(struct acpi_table_ibft *header, 578 struct ibft_hdr *hdr) 579 { 580 struct iscsi_boot_kobj *boot_kobj = NULL; 581 struct ibft_kobject *ibft_kobj = NULL; 582 struct ibft_nic *nic = (struct ibft_nic *)hdr; 583 struct pci_dev *pci_dev; 584 int rc = 0; 585 586 ibft_kobj = kzalloc(sizeof(*ibft_kobj), GFP_KERNEL); 587 if (!ibft_kobj) 588 return -ENOMEM; 589 590 ibft_kobj->header = header; 591 ibft_kobj->hdr = hdr; 592 593 switch (hdr->id) { 594 case id_initiator: 595 rc = ibft_verify_hdr("initiator", hdr, id_initiator, 596 sizeof(*ibft_kobj->initiator)); 597 if (rc) 598 break; 599 600 boot_kobj = iscsi_boot_create_initiator(boot_kset, hdr->index, 601 ibft_kobj, 602 ibft_attr_show_initiator, 603 ibft_check_initiator_for, 604 ibft_kobj_release); 605 if (!boot_kobj) { 606 rc = -ENOMEM; 607 goto free_ibft_obj; 608 } 609 break; 610 case id_nic: 611 rc = ibft_verify_hdr("ethernet", hdr, id_nic, 612 sizeof(*ibft_kobj->nic)); 613 if (rc) 614 break; 615 616 boot_kobj = iscsi_boot_create_ethernet(boot_kset, hdr->index, 617 ibft_kobj, 618 ibft_attr_show_nic, 619 ibft_check_nic_for, 620 ibft_kobj_release); 621 if (!boot_kobj) { 622 rc = -ENOMEM; 623 goto free_ibft_obj; 624 } 625 break; 626 case id_target: 627 rc = ibft_verify_hdr("target", hdr, id_target, 628 sizeof(*ibft_kobj->tgt)); 629 if (rc) 630 break; 631 632 boot_kobj = iscsi_boot_create_target(boot_kset, hdr->index, 633 ibft_kobj, 634 ibft_attr_show_target, 635 ibft_check_tgt_for, 636 ibft_kobj_release); 637 if (!boot_kobj) { 638 rc = -ENOMEM; 639 goto free_ibft_obj; 640 } 641 break; 642 case id_reserved: 643 case id_control: 644 case id_extensions: 645 /* Fields which we don't support. Ignore them */ 646 rc = 1; 647 break; 648 default: 649 printk(KERN_ERR "iBFT has unknown structure type (%d). " \ 650 "Report this bug to %.6s!\n", hdr->id, 651 header->header.oem_id); 652 rc = 1; 653 break; 654 } 655 656 if (rc) { 657 /* Skip adding this kobject, but exit with non-fatal error. */ 658 rc = 0; 659 goto free_ibft_obj; 660 } 661 662 if (hdr->id == id_nic) { 663 /* 664 * We don't search for the device in other domains than 665 * zero. This is because on x86 platforms the BIOS 666 * executes only devices which are in domain 0. Furthermore, the 667 * iBFT spec doesn't have a domain id field :-( 668 */ 669 pci_dev = pci_get_bus_and_slot((nic->pci_bdf & 0xff00) >> 8, 670 (nic->pci_bdf & 0xff)); 671 if (pci_dev) { 672 rc = sysfs_create_link(&boot_kobj->kobj, 673 &pci_dev->dev.kobj, "device"); 674 pci_dev_put(pci_dev); 675 } 676 } 677 return 0; 678 679 free_ibft_obj: 680 kfree(ibft_kobj); 681 return rc; 682 } 683 684 /* 685 * Scan the IBFT table structure for the NIC and Target fields. When 686 * found add them on the passed-in list. We do not support the other 687 * fields at this point, so they are skipped. 688 */ 689 static int __init ibft_register_kobjects(struct acpi_table_ibft *header) 690 { 691 struct ibft_control *control = NULL; 692 void *ptr, *end; 693 int rc = 0; 694 u16 offset; 695 u16 eot_offset; 696 697 control = (void *)header + sizeof(*header); 698 end = (void *)control + control->hdr.length; 699 eot_offset = (void *)header + header->header.length - (void *)control; 700 rc = ibft_verify_hdr("control", (struct ibft_hdr *)control, id_control, 701 sizeof(*control)); 702 703 /* iBFT table safety checking */ 704 rc |= ((control->hdr.index) ? -ENODEV : 0); 705 if (rc) { 706 printk(KERN_ERR "iBFT error: Control header is invalid!\n"); 707 return rc; 708 } 709 for (ptr = &control->initiator_off; ptr < end; ptr += sizeof(u16)) { 710 offset = *(u16 *)ptr; 711 if (offset && offset < header->header.length && 712 offset < eot_offset) { 713 rc = ibft_create_kobject(header, 714 (void *)header + offset); 715 if (rc) 716 break; 717 } 718 } 719 720 return rc; 721 } 722 723 static void ibft_unregister(void) 724 { 725 struct iscsi_boot_kobj *boot_kobj, *tmp_kobj; 726 struct ibft_kobject *ibft_kobj; 727 728 list_for_each_entry_safe(boot_kobj, tmp_kobj, 729 &boot_kset->kobj_list, list) { 730 ibft_kobj = boot_kobj->data; 731 if (ibft_kobj->hdr->id == id_nic) 732 sysfs_remove_link(&boot_kobj->kobj, "device"); 733 }; 734 } 735 736 static void ibft_cleanup(void) 737 { 738 if (boot_kset) { 739 ibft_unregister(); 740 iscsi_boot_destroy_kset(boot_kset); 741 } 742 } 743 744 static void __exit ibft_exit(void) 745 { 746 ibft_cleanup(); 747 } 748 749 #ifdef CONFIG_ACPI 750 static const struct { 751 char *sign; 752 } ibft_signs[] = { 753 /* 754 * One spec says "IBFT", the other says "iBFT". We have to check 755 * for both. 756 */ 757 { ACPI_SIG_IBFT }, 758 { "iBFT" }, 759 { "BIFT" }, /* Broadcom iSCSI Offload */ 760 }; 761 762 static void __init acpi_find_ibft_region(void) 763 { 764 int i; 765 struct acpi_table_header *table = NULL; 766 767 if (acpi_disabled) 768 return; 769 770 for (i = 0; i < ARRAY_SIZE(ibft_signs) && !ibft_addr; i++) { 771 acpi_get_table(ibft_signs[i].sign, 0, &table); 772 ibft_addr = (struct acpi_table_ibft *)table; 773 } 774 } 775 #else 776 static void __init acpi_find_ibft_region(void) 777 { 778 } 779 #endif 780 781 /* 782 * ibft_init() - creates sysfs tree entries for the iBFT data. 783 */ 784 static int __init ibft_init(void) 785 { 786 int rc = 0; 787 788 /* 789 As on UEFI systems the setup_arch()/find_ibft_region() 790 is called before ACPI tables are parsed and it only does 791 legacy finding. 792 */ 793 if (!ibft_addr) 794 acpi_find_ibft_region(); 795 796 if (ibft_addr) { 797 pr_info("iBFT detected.\n"); 798 799 rc = ibft_check_device(); 800 if (rc) 801 return rc; 802 803 boot_kset = iscsi_boot_create_kset("ibft"); 804 if (!boot_kset) 805 return -ENOMEM; 806 807 /* Scan the IBFT for data and register the kobjects. */ 808 rc = ibft_register_kobjects(ibft_addr); 809 if (rc) 810 goto out_free; 811 } else 812 printk(KERN_INFO "No iBFT detected.\n"); 813 814 return 0; 815 816 out_free: 817 ibft_cleanup(); 818 return rc; 819 } 820 821 module_init(ibft_init); 822 module_exit(ibft_exit); 823