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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright 2007-2010 Red Hat, Inc.4 * by Peter Jones <pjones@redhat.com>5 * Copyright 2008 IBM, Inc.6 * by Konrad Rzeszutek <konradr@linux.vnet.ibm.com>7 * Copyright 20088 * by Konrad Rzeszutek <ketuzsezr@darnok.org>9 *10 * This code exposes the iSCSI Boot Format Table to userland via sysfs.11 *12 * Changelog:13 *14 * 06 Jan 2010 - Peter Jones <pjones@redhat.com>15 * New changelog entries are in the git log from now on. Not here.16 *17 * 14 Mar 2008 - Konrad Rzeszutek <ketuzsezr@darnok.org>18 * Updated comments and copyrights. (v0.4.9)19 *20 * 11 Feb 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>21 * Converted to using ibft_addr. (v0.4.8)22 *23 * 8 Feb 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>24 * Combined two functions in one: reserve_ibft_region. (v0.4.7)25 *26 * 30 Jan 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>27 * Added logic to handle IPv6 addresses. (v0.4.6)28 *29 * 25 Jan 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>30 * Added logic to handle badly not-to-spec iBFT. (v0.4.5)31 *32 * 4 Jan 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>33 * Added __init to function declarations. (v0.4.4)34 *35 * 21 Dec 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>36 * Updated kobject registration, combined unregister functions in one37 * and code and style cleanup. (v0.4.3)38 *39 * 5 Dec 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>40 * Added end-markers to enums and re-organized kobject registration. (v0.4.2)41 *42 * 4 Dec 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>43 * Created 'device' sysfs link to the NIC and style cleanup. (v0.4.1)44 *45 * 28 Nov 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>46 * Added sysfs-ibft documentation, moved 'find_ibft' function to47 * in its own file and added text attributes for every struct field. (v0.4)48 *49 * 21 Nov 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>50 * Added text attributes emulating OpenFirmware /proc/device-tree naming.51 * Removed binary /sysfs interface (v0.3)52 *53 * 29 Aug 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>54 * Added functionality in setup.c to reserve iBFT region. (v0.2)55 *56 * 27 Aug 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>57 * First version exposing iBFT data via a binary /sysfs. (v0.1)58 */59 60 61#include <linux/blkdev.h>62#include <linux/capability.h>63#include <linux/ctype.h>64#include <linux/device.h>65#include <linux/err.h>66#include <linux/init.h>67#include <linux/iscsi_ibft.h>68#include <linux/limits.h>69#include <linux/module.h>70#include <linux/pci.h>71#include <linux/slab.h>72#include <linux/stat.h>73#include <linux/string.h>74#include <linux/types.h>75#include <linux/acpi.h>76#include <linux/iscsi_boot_sysfs.h>77 78#define IBFT_ISCSI_VERSION "0.5.0"79#define IBFT_ISCSI_DATE "2010-Feb-25"80 81MODULE_AUTHOR("Peter Jones <pjones@redhat.com> and "82 "Konrad Rzeszutek <ketuzsezr@darnok.org>");83MODULE_DESCRIPTION("sysfs interface to BIOS iBFT information");84MODULE_LICENSE("GPL");85MODULE_VERSION(IBFT_ISCSI_VERSION);86 87static struct acpi_table_ibft *ibft_addr;88 89struct ibft_hdr {90 u8 id;91 u8 version;92 u16 length;93 u8 index;94 u8 flags;95} __attribute__((__packed__));96 97struct ibft_control {98 struct ibft_hdr hdr;99 u16 extensions;100 u16 initiator_off;101 u16 nic0_off;102 u16 tgt0_off;103 u16 nic1_off;104 u16 tgt1_off;105 u16 expansion[];106} __attribute__((__packed__));107 108struct ibft_initiator {109 struct ibft_hdr hdr;110 char isns_server[16];111 char slp_server[16];112 char pri_radius_server[16];113 char sec_radius_server[16];114 u16 initiator_name_len;115 u16 initiator_name_off;116} __attribute__((__packed__));117 118struct ibft_nic {119 struct ibft_hdr hdr;120 char ip_addr[16];121 u8 subnet_mask_prefix;122 u8 origin;123 char gateway[16];124 char primary_dns[16];125 char secondary_dns[16];126 char dhcp[16];127 u16 vlan;128 char mac[6];129 u16 pci_bdf;130 u16 hostname_len;131 u16 hostname_off;132} __attribute__((__packed__));133 134struct ibft_tgt {135 struct ibft_hdr hdr;136 char ip_addr[16];137 u16 port;138 char lun[8];139 u8 chap_type;140 u8 nic_assoc;141 u16 tgt_name_len;142 u16 tgt_name_off;143 u16 chap_name_len;144 u16 chap_name_off;145 u16 chap_secret_len;146 u16 chap_secret_off;147 u16 rev_chap_name_len;148 u16 rev_chap_name_off;149 u16 rev_chap_secret_len;150 u16 rev_chap_secret_off;151} __attribute__((__packed__));152 153/*154 * The kobject different types and its names.155 *156*/157enum ibft_id {158 id_reserved = 0, /* We don't support. */159 id_control = 1, /* Should show up only once and is not exported. */160 id_initiator = 2,161 id_nic = 3,162 id_target = 4,163 id_extensions = 5, /* We don't support. */164 id_end_marker,165};166 167/*168 * The kobject and attribute structures.169 */170 171struct ibft_kobject {172 struct acpi_table_ibft *header;173 union {174 struct ibft_initiator *initiator;175 struct ibft_nic *nic;176 struct ibft_tgt *tgt;177 struct ibft_hdr *hdr;178 };179};180 181static struct iscsi_boot_kset *boot_kset;182 183/* fully null address */184static const char nulls[16];185 186/* IPv4-mapped IPv6 ::ffff:0.0.0.0 */187static const char mapped_nulls[16] = { 0x00, 0x00, 0x00, 0x00,188 0x00, 0x00, 0x00, 0x00,189 0x00, 0x00, 0xff, 0xff,190 0x00, 0x00, 0x00, 0x00 };191 192static int address_not_null(u8 *ip)193{194 return (memcmp(ip, nulls, 16) && memcmp(ip, mapped_nulls, 16));195}196 197/*198 * Helper functions to parse data properly.199 */200static ssize_t sprintf_ipaddr(char *buf, u8 *ip)201{202 char *str = buf;203 204 if (ip[0] == 0 && ip[1] == 0 && ip[2] == 0 && ip[3] == 0 &&205 ip[4] == 0 && ip[5] == 0 && ip[6] == 0 && ip[7] == 0 &&206 ip[8] == 0 && ip[9] == 0 && ip[10] == 0xff && ip[11] == 0xff) {207 /*208 * IPV4209 */210 str += sprintf(buf, "%pI4", ip + 12);211 } else {212 /*213 * IPv6214 */215 str += sprintf(str, "%pI6", ip);216 }217 str += sprintf(str, "\n");218 return str - buf;219}220 221static ssize_t sprintf_string(char *str, int len, char *buf)222{223 return sprintf(str, "%.*s\n", len, buf);224}225 226/*227 * Helper function to verify the IBFT header.228 */229static int ibft_verify_hdr(char *t, struct ibft_hdr *hdr, int id, int length)230{231 if (hdr->id != id) {232 printk(KERN_ERR "iBFT error: We expected the %s " \233 "field header.id to have %d but " \234 "found %d instead!\n", t, id, hdr->id);235 return -ENODEV;236 }237 if (length && hdr->length != length) {238 printk(KERN_ERR "iBFT error: We expected the %s " \239 "field header.length to have %d but " \240 "found %d instead!\n", t, length, hdr->length);241 return -ENODEV;242 }243 244 return 0;245}246 247/*248 * Routines for parsing the iBFT data to be human readable.249 */250static ssize_t ibft_attr_show_initiator(void *data, int type, char *buf)251{252 struct ibft_kobject *entry = data;253 struct ibft_initiator *initiator = entry->initiator;254 void *ibft_loc = entry->header;255 char *str = buf;256 257 if (!initiator)258 return 0;259 260 switch (type) {261 case ISCSI_BOOT_INI_INDEX:262 str += sprintf(str, "%d\n", initiator->hdr.index);263 break;264 case ISCSI_BOOT_INI_FLAGS:265 str += sprintf(str, "%d\n", initiator->hdr.flags);266 break;267 case ISCSI_BOOT_INI_ISNS_SERVER:268 str += sprintf_ipaddr(str, initiator->isns_server);269 break;270 case ISCSI_BOOT_INI_SLP_SERVER:271 str += sprintf_ipaddr(str, initiator->slp_server);272 break;273 case ISCSI_BOOT_INI_PRI_RADIUS_SERVER:274 str += sprintf_ipaddr(str, initiator->pri_radius_server);275 break;276 case ISCSI_BOOT_INI_SEC_RADIUS_SERVER:277 str += sprintf_ipaddr(str, initiator->sec_radius_server);278 break;279 case ISCSI_BOOT_INI_INITIATOR_NAME:280 str += sprintf_string(str, initiator->initiator_name_len,281 (char *)ibft_loc +282 initiator->initiator_name_off);283 break;284 default:285 break;286 }287 288 return str - buf;289}290 291static ssize_t ibft_attr_show_nic(void *data, int type, char *buf)292{293 struct ibft_kobject *entry = data;294 struct ibft_nic *nic = entry->nic;295 void *ibft_loc = entry->header;296 char *str = buf;297 __be32 val;298 299 if (!nic)300 return 0;301 302 switch (type) {303 case ISCSI_BOOT_ETH_INDEX:304 str += sprintf(str, "%d\n", nic->hdr.index);305 break;306 case ISCSI_BOOT_ETH_FLAGS:307 str += sprintf(str, "%d\n", nic->hdr.flags);308 break;309 case ISCSI_BOOT_ETH_IP_ADDR:310 str += sprintf_ipaddr(str, nic->ip_addr);311 break;312 case ISCSI_BOOT_ETH_SUBNET_MASK:313 val = cpu_to_be32(~((1 << (32-nic->subnet_mask_prefix))-1));314 str += sprintf(str, "%pI4", &val);315 break;316 case ISCSI_BOOT_ETH_PREFIX_LEN:317 str += sprintf(str, "%d\n", nic->subnet_mask_prefix);318 break;319 case ISCSI_BOOT_ETH_ORIGIN:320 str += sprintf(str, "%d\n", nic->origin);321 break;322 case ISCSI_BOOT_ETH_GATEWAY:323 str += sprintf_ipaddr(str, nic->gateway);324 break;325 case ISCSI_BOOT_ETH_PRIMARY_DNS:326 str += sprintf_ipaddr(str, nic->primary_dns);327 break;328 case ISCSI_BOOT_ETH_SECONDARY_DNS:329 str += sprintf_ipaddr(str, nic->secondary_dns);330 break;331 case ISCSI_BOOT_ETH_DHCP:332 str += sprintf_ipaddr(str, nic->dhcp);333 break;334 case ISCSI_BOOT_ETH_VLAN:335 str += sprintf(str, "%d\n", nic->vlan);336 break;337 case ISCSI_BOOT_ETH_MAC:338 str += sprintf(str, "%pM\n", nic->mac);339 break;340 case ISCSI_BOOT_ETH_HOSTNAME:341 str += sprintf_string(str, nic->hostname_len,342 (char *)ibft_loc + nic->hostname_off);343 break;344 default:345 break;346 }347 348 return str - buf;349};350 351static ssize_t ibft_attr_show_target(void *data, int type, char *buf)352{353 struct ibft_kobject *entry = data;354 struct ibft_tgt *tgt = entry->tgt;355 void *ibft_loc = entry->header;356 char *str = buf;357 int i;358 359 if (!tgt)360 return 0;361 362 switch (type) {363 case ISCSI_BOOT_TGT_INDEX:364 str += sprintf(str, "%d\n", tgt->hdr.index);365 break;366 case ISCSI_BOOT_TGT_FLAGS:367 str += sprintf(str, "%d\n", tgt->hdr.flags);368 break;369 case ISCSI_BOOT_TGT_IP_ADDR:370 str += sprintf_ipaddr(str, tgt->ip_addr);371 break;372 case ISCSI_BOOT_TGT_PORT:373 str += sprintf(str, "%d\n", tgt->port);374 break;375 case ISCSI_BOOT_TGT_LUN:376 for (i = 0; i < 8; i++)377 str += sprintf(str, "%x", (u8)tgt->lun[i]);378 str += sprintf(str, "\n");379 break;380 case ISCSI_BOOT_TGT_NIC_ASSOC:381 str += sprintf(str, "%d\n", tgt->nic_assoc);382 break;383 case ISCSI_BOOT_TGT_CHAP_TYPE:384 str += sprintf(str, "%d\n", tgt->chap_type);385 break;386 case ISCSI_BOOT_TGT_NAME:387 str += sprintf_string(str, tgt->tgt_name_len,388 (char *)ibft_loc + tgt->tgt_name_off);389 break;390 case ISCSI_BOOT_TGT_CHAP_NAME:391 str += sprintf_string(str, tgt->chap_name_len,392 (char *)ibft_loc + tgt->chap_name_off);393 break;394 case ISCSI_BOOT_TGT_CHAP_SECRET:395 str += sprintf_string(str, tgt->chap_secret_len,396 (char *)ibft_loc + tgt->chap_secret_off);397 break;398 case ISCSI_BOOT_TGT_REV_CHAP_NAME:399 str += sprintf_string(str, tgt->rev_chap_name_len,400 (char *)ibft_loc +401 tgt->rev_chap_name_off);402 break;403 case ISCSI_BOOT_TGT_REV_CHAP_SECRET:404 str += sprintf_string(str, tgt->rev_chap_secret_len,405 (char *)ibft_loc +406 tgt->rev_chap_secret_off);407 break;408 default:409 break;410 }411 412 return str - buf;413}414 415static ssize_t ibft_attr_show_acpitbl(void *data, int type, char *buf)416{417 struct ibft_kobject *entry = data;418 char *str = buf;419 420 switch (type) {421 case ISCSI_BOOT_ACPITBL_SIGNATURE:422 str += sprintf_string(str, ACPI_NAMESEG_SIZE,423 entry->header->header.signature);424 break;425 case ISCSI_BOOT_ACPITBL_OEM_ID:426 str += sprintf_string(str, ACPI_OEM_ID_SIZE,427 entry->header->header.oem_id);428 break;429 case ISCSI_BOOT_ACPITBL_OEM_TABLE_ID:430 str += sprintf_string(str, ACPI_OEM_TABLE_ID_SIZE,431 entry->header->header.oem_table_id);432 break;433 default:434 break;435 }436 437 return str - buf;438}439 440static int __init ibft_check_device(void)441{442 int len;443 u8 *pos;444 u8 csum = 0;445 446 len = ibft_addr->header.length;447 448 /* Sanity checking of iBFT. */449 if (ibft_addr->header.revision != 1) {450 printk(KERN_ERR "iBFT module supports only revision 1, " \451 "while this is %d.\n",452 ibft_addr->header.revision);453 return -ENOENT;454 }455 for (pos = (u8 *)ibft_addr; pos < (u8 *)ibft_addr + len; pos++)456 csum += *pos;457 458 if (csum) {459 printk(KERN_ERR "iBFT has incorrect checksum (0x%x)!\n", csum);460 return -ENOENT;461 }462 463 return 0;464}465 466/*467 * Helper routiners to check to determine if the entry is valid468 * in the proper iBFT structure.469 */470static umode_t ibft_check_nic_for(void *data, int type)471{472 struct ibft_kobject *entry = data;473 struct ibft_nic *nic = entry->nic;474 umode_t rc = 0;475 476 switch (type) {477 case ISCSI_BOOT_ETH_INDEX:478 case ISCSI_BOOT_ETH_FLAGS:479 rc = S_IRUGO;480 break;481 case ISCSI_BOOT_ETH_IP_ADDR:482 if (address_not_null(nic->ip_addr))483 rc = S_IRUGO;484 break;485 case ISCSI_BOOT_ETH_PREFIX_LEN:486 case ISCSI_BOOT_ETH_SUBNET_MASK:487 if (nic->subnet_mask_prefix)488 rc = S_IRUGO;489 break;490 case ISCSI_BOOT_ETH_ORIGIN:491 rc = S_IRUGO;492 break;493 case ISCSI_BOOT_ETH_GATEWAY:494 if (address_not_null(nic->gateway))495 rc = S_IRUGO;496 break;497 case ISCSI_BOOT_ETH_PRIMARY_DNS:498 if (address_not_null(nic->primary_dns))499 rc = S_IRUGO;500 break;501 case ISCSI_BOOT_ETH_SECONDARY_DNS:502 if (address_not_null(nic->secondary_dns))503 rc = S_IRUGO;504 break;505 case ISCSI_BOOT_ETH_DHCP:506 if (address_not_null(nic->dhcp))507 rc = S_IRUGO;508 break;509 case ISCSI_BOOT_ETH_VLAN:510 case ISCSI_BOOT_ETH_MAC:511 rc = S_IRUGO;512 break;513 case ISCSI_BOOT_ETH_HOSTNAME:514 if (nic->hostname_off)515 rc = S_IRUGO;516 break;517 default:518 break;519 }520 521 return rc;522}523 524static umode_t __init ibft_check_tgt_for(void *data, int type)525{526 struct ibft_kobject *entry = data;527 struct ibft_tgt *tgt = entry->tgt;528 umode_t rc = 0;529 530 switch (type) {531 case ISCSI_BOOT_TGT_INDEX:532 case ISCSI_BOOT_TGT_FLAGS:533 case ISCSI_BOOT_TGT_IP_ADDR:534 case ISCSI_BOOT_TGT_PORT:535 case ISCSI_BOOT_TGT_LUN:536 case ISCSI_BOOT_TGT_NIC_ASSOC:537 case ISCSI_BOOT_TGT_CHAP_TYPE:538 rc = S_IRUGO;539 break;540 case ISCSI_BOOT_TGT_NAME:541 if (tgt->tgt_name_len)542 rc = S_IRUGO;543 break;544 case ISCSI_BOOT_TGT_CHAP_NAME:545 case ISCSI_BOOT_TGT_CHAP_SECRET:546 if (tgt->chap_name_len)547 rc = S_IRUGO;548 break;549 case ISCSI_BOOT_TGT_REV_CHAP_NAME:550 case ISCSI_BOOT_TGT_REV_CHAP_SECRET:551 if (tgt->rev_chap_name_len)552 rc = S_IRUGO;553 break;554 default:555 break;556 }557 558 return rc;559}560 561static umode_t __init ibft_check_initiator_for(void *data, int type)562{563 struct ibft_kobject *entry = data;564 struct ibft_initiator *init = entry->initiator;565 umode_t rc = 0;566 567 switch (type) {568 case ISCSI_BOOT_INI_INDEX:569 case ISCSI_BOOT_INI_FLAGS:570 rc = S_IRUGO;571 break;572 case ISCSI_BOOT_INI_ISNS_SERVER:573 if (address_not_null(init->isns_server))574 rc = S_IRUGO;575 break;576 case ISCSI_BOOT_INI_SLP_SERVER:577 if (address_not_null(init->slp_server))578 rc = S_IRUGO;579 break;580 case ISCSI_BOOT_INI_PRI_RADIUS_SERVER:581 if (address_not_null(init->pri_radius_server))582 rc = S_IRUGO;583 break;584 case ISCSI_BOOT_INI_SEC_RADIUS_SERVER:585 if (address_not_null(init->sec_radius_server))586 rc = S_IRUGO;587 break;588 case ISCSI_BOOT_INI_INITIATOR_NAME:589 if (init->initiator_name_len)590 rc = S_IRUGO;591 break;592 default:593 break;594 }595 596 return rc;597}598 599static umode_t __init ibft_check_acpitbl_for(void *data, int type)600{601 602 umode_t rc = 0;603 604 switch (type) {605 case ISCSI_BOOT_ACPITBL_SIGNATURE:606 case ISCSI_BOOT_ACPITBL_OEM_ID:607 case ISCSI_BOOT_ACPITBL_OEM_TABLE_ID:608 rc = S_IRUGO;609 break;610 default:611 break;612 }613 614 return rc;615}616 617static void ibft_kobj_release(void *data)618{619 kfree(data);620}621 622/*623 * Helper function for ibft_register_kobjects.624 */625static int __init ibft_create_kobject(struct acpi_table_ibft *header,626 struct ibft_hdr *hdr)627{628 struct iscsi_boot_kobj *boot_kobj = NULL;629 struct ibft_kobject *ibft_kobj = NULL;630 struct ibft_nic *nic = (struct ibft_nic *)hdr;631 struct pci_dev *pci_dev;632 int rc = 0;633 634 ibft_kobj = kzalloc(sizeof(*ibft_kobj), GFP_KERNEL);635 if (!ibft_kobj)636 return -ENOMEM;637 638 ibft_kobj->header = header;639 ibft_kobj->hdr = hdr;640 641 switch (hdr->id) {642 case id_initiator:643 rc = ibft_verify_hdr("initiator", hdr, id_initiator,644 sizeof(*ibft_kobj->initiator));645 if (rc)646 break;647 648 boot_kobj = iscsi_boot_create_initiator(boot_kset, hdr->index,649 ibft_kobj,650 ibft_attr_show_initiator,651 ibft_check_initiator_for,652 ibft_kobj_release);653 if (!boot_kobj) {654 rc = -ENOMEM;655 goto free_ibft_obj;656 }657 break;658 case id_nic:659 rc = ibft_verify_hdr("ethernet", hdr, id_nic,660 sizeof(*ibft_kobj->nic));661 if (rc)662 break;663 664 boot_kobj = iscsi_boot_create_ethernet(boot_kset, hdr->index,665 ibft_kobj,666 ibft_attr_show_nic,667 ibft_check_nic_for,668 ibft_kobj_release);669 if (!boot_kobj) {670 rc = -ENOMEM;671 goto free_ibft_obj;672 }673 break;674 case id_target:675 rc = ibft_verify_hdr("target", hdr, id_target,676 sizeof(*ibft_kobj->tgt));677 if (rc)678 break;679 680 boot_kobj = iscsi_boot_create_target(boot_kset, hdr->index,681 ibft_kobj,682 ibft_attr_show_target,683 ibft_check_tgt_for,684 ibft_kobj_release);685 if (!boot_kobj) {686 rc = -ENOMEM;687 goto free_ibft_obj;688 }689 break;690 case id_reserved:691 case id_control:692 case id_extensions:693 /* Fields which we don't support. Ignore them */694 rc = 1;695 break;696 default:697 printk(KERN_ERR "iBFT has unknown structure type (%d). " \698 "Report this bug to %.6s!\n", hdr->id,699 header->header.oem_id);700 rc = 1;701 break;702 }703 704 if (rc) {705 /* Skip adding this kobject, but exit with non-fatal error. */706 rc = 0;707 goto free_ibft_obj;708 }709 710 if (hdr->id == id_nic) {711 /*712 * We don't search for the device in other domains than713 * zero. This is because on x86 platforms the BIOS714 * executes only devices which are in domain 0. Furthermore, the715 * iBFT spec doesn't have a domain id field :-(716 */717 pci_dev = pci_get_domain_bus_and_slot(0,718 (nic->pci_bdf & 0xff00) >> 8,719 (nic->pci_bdf & 0xff));720 if (pci_dev) {721 rc = sysfs_create_link(&boot_kobj->kobj,722 &pci_dev->dev.kobj, "device");723 pci_dev_put(pci_dev);724 }725 }726 return 0;727 728free_ibft_obj:729 kfree(ibft_kobj);730 return rc;731}732 733/*734 * Scan the IBFT table structure for the NIC and Target fields. When735 * found add them on the passed-in list. We do not support the other736 * fields at this point, so they are skipped.737 */738static int __init ibft_register_kobjects(struct acpi_table_ibft *header)739{740 struct ibft_control *control = NULL;741 struct iscsi_boot_kobj *boot_kobj;742 struct ibft_kobject *ibft_kobj;743 void *ptr, *end;744 int rc = 0;745 u16 offset;746 u16 eot_offset;747 748 control = (void *)header + sizeof(*header);749 end = (void *)control + control->hdr.length;750 eot_offset = (void *)header + header->header.length - (void *)control;751 rc = ibft_verify_hdr("control", (struct ibft_hdr *)control, id_control, 0);752 753 /* iBFT table safety checking */754 rc |= ((control->hdr.index) ? -ENODEV : 0);755 rc |= ((control->hdr.length < sizeof(*control)) ? -ENODEV : 0);756 if (rc) {757 printk(KERN_ERR "iBFT error: Control header is invalid!\n");758 return rc;759 }760 for (ptr = &control->initiator_off; ptr + sizeof(u16) <= end; ptr += sizeof(u16)) {761 offset = *(u16 *)ptr;762 if (offset && offset < header->header.length &&763 offset < eot_offset) {764 rc = ibft_create_kobject(header,765 (void *)header + offset);766 if (rc)767 break;768 }769 }770 if (rc)771 return rc;772 773 ibft_kobj = kzalloc(sizeof(*ibft_kobj), GFP_KERNEL);774 if (!ibft_kobj)775 return -ENOMEM;776 777 ibft_kobj->header = header;778 ibft_kobj->hdr = NULL; /*for ibft_unregister*/779 780 boot_kobj = iscsi_boot_create_acpitbl(boot_kset, 0,781 ibft_kobj,782 ibft_attr_show_acpitbl,783 ibft_check_acpitbl_for,784 ibft_kobj_release);785 if (!boot_kobj) {786 kfree(ibft_kobj);787 rc = -ENOMEM;788 }789 790 return rc;791}792 793static void ibft_unregister(void)794{795 struct iscsi_boot_kobj *boot_kobj, *tmp_kobj;796 struct ibft_kobject *ibft_kobj;797 798 list_for_each_entry_safe(boot_kobj, tmp_kobj,799 &boot_kset->kobj_list, list) {800 ibft_kobj = boot_kobj->data;801 if (ibft_kobj->hdr && ibft_kobj->hdr->id == id_nic)802 sysfs_remove_link(&boot_kobj->kobj, "device");803 };804}805 806static void ibft_cleanup(void)807{808 if (boot_kset) {809 ibft_unregister();810 iscsi_boot_destroy_kset(boot_kset);811 }812}813 814static void __exit ibft_exit(void)815{816 ibft_cleanup();817}818 819#ifdef CONFIG_ACPI820static const struct {821 char *sign;822} ibft_signs[] = {823 /*824 * One spec says "IBFT", the other says "iBFT". We have to check825 * for both.826 */827 { ACPI_SIG_IBFT },828 { "iBFT" },829 { "BIFT" }, /* Broadcom iSCSI Offload */830};831 832static void __init acpi_find_ibft_region(void)833{834 int i;835 struct acpi_table_header *table = NULL;836 837 if (acpi_disabled)838 return;839 840 for (i = 0; i < ARRAY_SIZE(ibft_signs) && !ibft_addr; i++) {841 acpi_get_table(ibft_signs[i].sign, 0, &table);842 ibft_addr = (struct acpi_table_ibft *)table;843 }844}845#else846static void __init acpi_find_ibft_region(void)847{848}849#endif850#ifdef CONFIG_ISCSI_IBFT_FIND851static int __init acpi_find_isa_region(void)852{853 if (ibft_phys_addr) {854 ibft_addr = isa_bus_to_virt(ibft_phys_addr);855 return 0;856 }857 return -ENODEV;858}859#else860static int __init acpi_find_isa_region(void)861{862 return -ENODEV;863}864#endif865/*866 * ibft_init() - creates sysfs tree entries for the iBFT data.867 */868static int __init ibft_init(void)869{870 int rc = 0;871 872 /*873 As on UEFI systems the setup_arch()/reserve_ibft_region()874 is called before ACPI tables are parsed and it only does875 legacy finding.876 */877 if (acpi_find_isa_region())878 acpi_find_ibft_region();879 880 if (ibft_addr) {881 pr_info("iBFT detected.\n");882 883 rc = ibft_check_device();884 if (rc)885 return rc;886 887 boot_kset = iscsi_boot_create_kset("ibft");888 if (!boot_kset)889 return -ENOMEM;890 891 /* Scan the IBFT for data and register the kobjects. */892 rc = ibft_register_kobjects(ibft_addr);893 if (rc)894 goto out_free;895 } else896 printk(KERN_INFO "No iBFT detected.\n");897 898 return 0;899 900out_free:901 ibft_cleanup();902 return rc;903}904 905module_init(ibft_init);906module_exit(ibft_exit);907