drivers/firmware/iscsi_ibft.c

   1 /*
   2  *  Copyright 2007 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  *  14 Mar 2008 - Konrad Rzeszutek <ketuzsezr@darnok.org>
  23  *    Updated comments and copyrights. (v0.4.9)
  24  *
  25  *  11 Feb 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
  26  *    Converted to using ibft_addr. (v0.4.8)
  27  *
  28  *   8 Feb 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
  29  *    Combined two functions in one: reserve_ibft_region. (v0.4.7)
  30  *
  31  *  30 Jan 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
  32  *   Added logic to handle IPv6 addresses. (v0.4.6)
  33  *
  34  *  25 Jan 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
  35  *   Added logic to handle badly not-to-spec iBFT. (v0.4.5)
  36  *
  37  *   4 Jan 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
  38  *   Added __init to function declarations. (v0.4.4)
  39  *
  40  *  21 Dec 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
  41  *   Updated kobject registration, combined unregister functions in one
  42  *   and code and style cleanup. (v0.4.3)
  43  *
  44  *   5 Dec 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
  45  *   Added end-markers to enums and re-organized kobject registration. (v0.4.2)
  46  *
  47  *   4 Dec 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
  48  *   Created 'device' sysfs link to the NIC and style cleanup. (v0.4.1)
  49  *
  50  *  28 Nov 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
  51  *   Added sysfs-ibft documentation, moved 'find_ibft' function to
  52  *   in its own file and added text attributes for every struct field.  (v0.4)
  53  *
  54  *  21 Nov 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
  55  *   Added text attributes emulating OpenFirmware /proc/device-tree naming.
  56  *   Removed binary /sysfs interface (v0.3)
  57  *
  58  *  29 Aug 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
  59  *   Added functionality in setup.c to reserve iBFT region. (v0.2)
  60  *
  61  *  27 Aug 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
  62  *   First version exposing iBFT data via a binary /sysfs. (v0.1)
  63  *
  64  */
  65
  66
  67 #include <linux/blkdev.h>
  68 #include <linux/capability.h>
  69 #include <linux/ctype.h>
  70 #include <linux/device.h>
  71 #include <linux/err.h>
  72 #include <linux/init.h>
  73 #include <linux/iscsi_ibft.h>
  74 #include <linux/limits.h>
  75 #include <linux/module.h>
  76 #include <linux/pci.h>
  77 #include <linux/slab.h>
  78 #include <linux/stat.h>
  79 #include <linux/string.h>
  80 #include <linux/types.h>
  81
  82 #define IBFT_ISCSI_VERSION "0.4.9"
  83 #define IBFT_ISCSI_DATE "2008-Mar-14"
  84
  85 MODULE_AUTHOR("Peter Jones <pjones@redhat.com> and \
  86 Konrad Rzeszutek <ketuzsezr@darnok.org>");
  87 MODULE_DESCRIPTION("sysfs interface to BIOS iBFT information");
  88 MODULE_LICENSE("GPL");
  89 MODULE_VERSION(IBFT_ISCSI_VERSION);
  90
  91 struct ibft_hdr {
  92         u8 id;
  93         u8 version;
  94         u16 length;
  95         u8 index;
  96         u8 flags;
  97 } __attribute__((__packed__));
  98
  99 struct ibft_control {
 100         struct ibft_hdr hdr;
 101         u16 extensions;
 102         u16 initiator_off;
 103         u16 nic0_off;
 104         u16 tgt0_off;
 105         u16 nic1_off;
 106         u16 tgt1_off;
 107 } __attribute__((__packed__));
 108
 109 struct ibft_initiator {
 110         struct ibft_hdr hdr;
 111         char isns_server[16];
 112         char slp_server[16];
 113         char pri_radius_server[16];
 114         char sec_radius_server[16];
 115         u16 initiator_name_len;
 116         u16 initiator_name_off;
 117 } __attribute__((__packed__));
 118
 119 struct ibft_nic {
 120         struct ibft_hdr hdr;
 121         char ip_addr[16];
 122         u8 subnet_mask_prefix;
 123         u8 origin;
 124         char gateway[16];
 125         char primary_dns[16];
 126         char secondary_dns[16];
 127         char dhcp[16];
 128         u16 vlan;
 129         char mac[6];
 130         u16 pci_bdf;
 131         u16 hostname_len;
 132         u16 hostname_off;
 133 } __attribute__((__packed__));
 134
 135 struct ibft_tgt {
 136         struct ibft_hdr hdr;
 137         char ip_addr[16];
 138         u16 port;
 139         char lun[8];
 140         u8 chap_type;
 141         u8 nic_assoc;
 142         u16 tgt_name_len;
 143         u16 tgt_name_off;
 144         u16 chap_name_len;
 145         u16 chap_name_off;
 146         u16 chap_secret_len;
 147         u16 chap_secret_off;
 148         u16 rev_chap_name_len;
 149         u16 rev_chap_name_off;
 150         u16 rev_chap_secret_len;
 151         u16 rev_chap_secret_off;
 152 } __attribute__((__packed__));
 153
 154 /*
 155  * The kobject different types and its names.
 156  *
 157 */
 158 enum ibft_id {
 159         id_reserved = 0, /* We don't support. */
 160         id_control = 1, /* Should show up only once and is not exported. */
 161         id_initiator = 2,
 162         id_nic = 3,
 163         id_target = 4,
 164         id_extensions = 5, /* We don't support. */
 165         id_end_marker,
 166 };
 167
 168 /*
 169  * We do not support the other types, hence the usage of NULL.
 170  * This maps to the enum ibft_id.
 171  */
 172 static const char *ibft_id_names[] =
 173         {NULL, NULL, "initiator", "ethernet%d", "target%d", NULL, NULL};
 174
 175 /*
 176  * The text attributes names for each of the kobjects.
 177 */
 178 enum ibft_eth_properties_enum {
 179         ibft_eth_index,
 180         ibft_eth_flags,
 181         ibft_eth_ip_addr,
 182         ibft_eth_subnet_mask,
 183         ibft_eth_origin,
 184         ibft_eth_gateway,
 185         ibft_eth_primary_dns,
 186         ibft_eth_secondary_dns,
 187         ibft_eth_dhcp,
 188         ibft_eth_vlan,
 189         ibft_eth_mac,
 190         /* ibft_eth_pci_bdf - this is replaced by link to the device itself. */
 191         ibft_eth_hostname,
 192         ibft_eth_end_marker,
 193 };
 194
 195 static const char *ibft_eth_properties[] =
 196         {"index", "flags", "ip-addr", "subnet-mask", "origin", "gateway",
 197         "primary-dns", "secondary-dns", "dhcp", "vlan", "mac", "hostname",
 198         NULL};
 199
 200 enum ibft_tgt_properties_enum {
 201         ibft_tgt_index,
 202         ibft_tgt_flags,
 203         ibft_tgt_ip_addr,
 204         ibft_tgt_port,
 205         ibft_tgt_lun,
 206         ibft_tgt_chap_type,
 207         ibft_tgt_nic_assoc,
 208         ibft_tgt_name,
 209         ibft_tgt_chap_name,
 210         ibft_tgt_chap_secret,
 211         ibft_tgt_rev_chap_name,
 212         ibft_tgt_rev_chap_secret,
 213         ibft_tgt_end_marker,
 214 };
 215
 216 static const char *ibft_tgt_properties[] =
 217         {"index", "flags", "ip-addr", "port", "lun", "chap-type", "nic-assoc",
 218         "target-name", "chap-name", "chap-secret", "rev-chap-name",
 219         "rev-chap-name-secret", NULL};
 220
 221 enum ibft_initiator_properties_enum {
 222         ibft_init_index,
 223         ibft_init_flags,
 224         ibft_init_isns_server,
 225         ibft_init_slp_server,
 226         ibft_init_pri_radius_server,
 227         ibft_init_sec_radius_server,
 228         ibft_init_initiator_name,
 229         ibft_init_end_marker,
 230 };
 231
 232 static const char *ibft_initiator_properties[] =
 233         {"index", "flags", "isns-server", "slp-server", "pri-radius-server",
 234         "sec-radius-server", "initiator-name", NULL};
 235
 236 /*
 237  * The kobject and attribute structures.
 238  */
 239
 240 struct ibft_kobject {
 241         struct ibft_table_header *header;
 242         union {
 243                 struct ibft_initiator *initiator;
 244                 struct ibft_nic *nic;
 245                 struct ibft_tgt *tgt;
 246                 struct ibft_hdr *hdr;
 247         };
 248         struct kobject kobj;
 249         struct list_head node;
 250 };
 251
 252 struct ibft_attribute {
 253         struct attribute attr;
 254         ssize_t (*show) (struct  ibft_kobject *entry,
 255                          struct ibft_attribute *attr, char *buf);
 256         union {
 257                 struct ibft_initiator *initiator;
 258                 struct ibft_nic *nic;
 259                 struct ibft_tgt *tgt;
 260                 struct ibft_hdr *hdr;
 261         };
 262         struct kobject *kobj;
 263         int type; /* The enum of the type. This can be any value of:
 264                 ibft_eth_properties_enum, ibft_tgt_properties_enum,
 265                 or ibft_initiator_properties_enum. */
 266         struct list_head node;
 267 };
 268
 269 static LIST_HEAD(ibft_attr_list);
 270 static LIST_HEAD(ibft_kobject_list);
 271
 272 static const char nulls[16];
 273
 274 /*
 275  * Helper functions to parse data properly.
 276  */
 277 static ssize_t sprintf_ipaddr(char *buf, u8 *ip)
 278 {
 279         char *str = buf;
 280
 281         if (ip[0] == 0 && ip[1] == 0 && ip[2] == 0 && ip[3] == 0 &&
 282             ip[4] == 0 && ip[5] == 0 && ip[6] == 0 && ip[7] == 0 &&
 283             ip[8] == 0 && ip[9] == 0 && ip[10] == 0xff && ip[11] == 0xff) {
 284                 /*
 285                  * IPV4
 286                  */
 287                 str += sprintf(buf, "%pI4", ip + 12);
 288         } else {
 289                 /*
 290                  * IPv6
 291                  */
 292                 str += sprintf(str, "%pI6", ip);
 293         }
 294         str += sprintf(str, "\n");
 295         return str - buf;
 296 }
 297
 298 static ssize_t sprintf_string(char *str, int len, char *buf)
 299 {
 300         return sprintf(str, "%.*s\n", len, buf);
 301 }
 302
 303 /*
 304  * Helper function to verify the IBFT header.
 305  */
 306 static int ibft_verify_hdr(char *t, struct ibft_hdr *hdr, int id, int length)
 307 {
 308         if (hdr->id != id) {
 309                 printk(KERN_ERR "iBFT error: We expected the " \
 310                                 "field header.id to have %d but " \
 311                                 "found %d instead!\n", id, hdr->id);
 312                 return -ENODEV;
 313         }
 314         if (hdr->length != length) {
 315                 printk(KERN_ERR "iBFT error: We expected the " \
 316                                 "field header.length to have %d but " \
 317                                 "found %d instead!\n", length, hdr->length);
 318                 return -ENODEV;
 319         }
 320
 321         return 0;
 322 }
 323
 324 static void ibft_release(struct kobject *kobj)
 325 {
 326         struct ibft_kobject *ibft =
 327                 container_of(kobj, struct ibft_kobject, kobj);
 328         kfree(ibft);
 329 }
 330
 331 /*
 332  *  Routines for parsing the iBFT data to be human readable.
 333  */
 334 static ssize_t ibft_attr_show_initiator(struct ibft_kobject *entry,
 335                                         struct ibft_attribute *attr,
 336                                         char *buf)
 337 {
 338         struct ibft_initiator *initiator = entry->initiator;
 339         void *ibft_loc = entry->header;
 340         char *str = buf;
 341
 342         if (!initiator)
 343                 return 0;
 344
 345         switch (attr->type) {
 346         case ibft_init_index:
 347                 str += sprintf(str, "%d\n", initiator->hdr.index);
 348                 break;
 349         case ibft_init_flags:
 350                 str += sprintf(str, "%d\n", initiator->hdr.flags);
 351                 break;
 352         case ibft_init_isns_server:
 353                 str += sprintf_ipaddr(str, initiator->isns_server);
 354                 break;
 355         case ibft_init_slp_server:
 356                 str += sprintf_ipaddr(str, initiator->slp_server);
 357                 break;
 358         case ibft_init_pri_radius_server:
 359                 str += sprintf_ipaddr(str, initiator->pri_radius_server);
 360                 break;
 361         case ibft_init_sec_radius_server:
 362                 str += sprintf_ipaddr(str, initiator->sec_radius_server);
 363                 break;
 364         case ibft_init_initiator_name:
 365                 str += sprintf_string(str, initiator->initiator_name_len,
 366                                       (char *)ibft_loc +
 367                                       initiator->initiator_name_off);
 368                 break;
 369         default:
 370                 break;
 371         }
 372
 373         return str - buf;
 374 }
 375
 376 static ssize_t ibft_attr_show_nic(struct ibft_kobject *entry,
 377                                   struct ibft_attribute *attr,
 378                                   char *buf)
 379 {
 380         struct ibft_nic *nic = entry->nic;
 381         void *ibft_loc = entry->header;
 382         char *str = buf;
 383         char *mac;
 384         int val;
 385
 386         if (!nic)
 387                 return 0;
 388
 389         switch (attr->type) {
 390         case ibft_eth_index:
 391                 str += sprintf(str, "%d\n", nic->hdr.index);
 392                 break;
 393         case ibft_eth_flags:
 394                 str += sprintf(str, "%d\n", nic->hdr.flags);
 395                 break;
 396         case ibft_eth_ip_addr:
 397                 str += sprintf_ipaddr(str, nic->ip_addr);
 398                 break;
 399         case ibft_eth_subnet_mask:
 400                 val = ~((1 << (32-nic->subnet_mask_prefix))-1);
 401                 str += sprintf(str, NIPQUAD_FMT,
 402                                (u8)(val >> 24), (u8)(val >> 16),
 403                                (u8)(val >> 8), (u8)(val));
 404                 break;
 405         case ibft_eth_origin:
 406                 str += sprintf(str, "%d\n", nic->origin);
 407                 break;
 408         case ibft_eth_gateway:
 409                 str += sprintf_ipaddr(str, nic->gateway);
 410                 break;
 411         case ibft_eth_primary_dns:
 412                 str += sprintf_ipaddr(str, nic->primary_dns);
 413                 break;
 414         case ibft_eth_secondary_dns:
 415                 str += sprintf_ipaddr(str, nic->secondary_dns);
 416                 break;
 417         case ibft_eth_dhcp:
 418                 str += sprintf_ipaddr(str, nic->dhcp);
 419                 break;
 420         case ibft_eth_vlan:
 421                 str += sprintf(str, "%d\n", nic->vlan);
 422                 break;
 423         case ibft_eth_mac:
 424                 mac = nic->mac;
 425                 str += sprintf(str, "%02x:%02x:%02x:%02x:%02x:%02x\n",
 426                                (u8)mac[0], (u8)mac[1], (u8)mac[2],
 427                                (u8)mac[3], (u8)mac[4], (u8)mac[5]);
 428                 break;
 429         case ibft_eth_hostname:
 430                 str += sprintf_string(str, nic->hostname_len,
 431                                       (char *)ibft_loc + nic->hostname_off);
 432                 break;
 433         default:
 434                 break;
 435         }
 436
 437         return str - buf;
 438 };
 439
 440 static ssize_t ibft_attr_show_target(struct ibft_kobject *entry,
 441                                      struct ibft_attribute *attr,
 442                                      char *buf)
 443 {
 444         struct ibft_tgt *tgt = entry->tgt;
 445         void *ibft_loc = entry->header;
 446         char *str = buf;
 447         int i;
 448
 449         if (!tgt)
 450                 return 0;
 451
 452         switch (attr->type) {
 453         case ibft_tgt_index:
 454                 str += sprintf(str, "%d\n", tgt->hdr.index);
 455                 break;
 456         case ibft_tgt_flags:
 457                 str += sprintf(str, "%d\n", tgt->hdr.flags);
 458                 break;
 459         case ibft_tgt_ip_addr:
 460                 str += sprintf_ipaddr(str, tgt->ip_addr);
 461                 break;
 462         case ibft_tgt_port:
 463                 str += sprintf(str, "%d\n", tgt->port);
 464                 break;
 465         case ibft_tgt_lun:
 466                 for (i = 0; i < 8; i++)
 467                         str += sprintf(str, "%x", (u8)tgt->lun[i]);
 468                 str += sprintf(str, "\n");
 469                 break;
 470         case ibft_tgt_nic_assoc:
 471                 str += sprintf(str, "%d\n", tgt->nic_assoc);
 472                 break;
 473         case ibft_tgt_chap_type:
 474                 str += sprintf(str, "%d\n", tgt->chap_type);
 475                 break;
 476         case ibft_tgt_name:
 477                 str += sprintf_string(str, tgt->tgt_name_len,
 478                                       (char *)ibft_loc + tgt->tgt_name_off);
 479                 break;
 480         case ibft_tgt_chap_name:
 481                 str += sprintf_string(str, tgt->chap_name_len,
 482                                       (char *)ibft_loc + tgt->chap_name_off);
 483                 break;
 484         case ibft_tgt_chap_secret:
 485                 str += sprintf_string(str, tgt->chap_secret_len,
 486                                       (char *)ibft_loc + tgt->chap_secret_off);
 487                 break;
 488         case ibft_tgt_rev_chap_name:
 489                 str += sprintf_string(str, tgt->rev_chap_name_len,
 490                                       (char *)ibft_loc +
 491                                       tgt->rev_chap_name_off);
 492                 break;
 493         case ibft_tgt_rev_chap_secret:
 494                 str += sprintf_string(str, tgt->rev_chap_secret_len,
 495                                       (char *)ibft_loc +
 496                                       tgt->rev_chap_secret_off);
 497                 break;
 498         default:
 499                 break;
 500         }
 501
 502         return str - buf;
 503 }
 504
 505 /*
 506  * The routine called for all sysfs attributes.
 507  */
 508 static ssize_t ibft_show_attribute(struct kobject *kobj,
 509                                     struct attribute *attr,
 510                                     char *buf)
 511 {
 512         struct ibft_kobject *dev =
 513                 container_of(kobj, struct ibft_kobject, kobj);
 514         struct ibft_attribute *ibft_attr =
 515                 container_of(attr, struct ibft_attribute, attr);
 516         ssize_t ret = -EIO;
 517         char *str = buf;
 518
 519         if (!capable(CAP_SYS_ADMIN))
 520                 return -EACCES;
 521
 522         if (ibft_attr->show)
 523                 ret = ibft_attr->show(dev, ibft_attr, str);
 524
 525         return ret;
 526 }
 527
 528 static struct sysfs_ops ibft_attr_ops = {
 529         .show = ibft_show_attribute,
 530 };
 531
 532 static struct kobj_type ibft_ktype = {
 533         .release = ibft_release,
 534         .sysfs_ops = &ibft_attr_ops,
 535 };
 536
 537 static struct kset *ibft_kset;
 538
 539 static int __init ibft_check_device(void)
 540 {
 541         int len;
 542         u8 *pos;
 543         u8 csum = 0;
 544
 545         len = ibft_addr->length;
 546
 547         /* Sanity checking of iBFT. */
 548         if (ibft_addr->revision != 1) {
 549                 printk(KERN_ERR "iBFT module supports only revision 1, " \
 550                                 "while this is %d.\n", ibft_addr->revision);
 551                 return -ENOENT;
 552         }
 553         for (pos = (u8 *)ibft_addr; pos < (u8 *)ibft_addr + len; pos++)
 554                 csum += *pos;
 555
 556         if (csum) {
 557                 printk(KERN_ERR "iBFT has incorrect checksum (0x%x)!\n", csum);
 558                 return -ENOENT;
 559         }
 560
 561         return 0;
 562 }
 563
 564 /*
 565  * Helper function for ibft_register_kobjects.
 566  */
 567 static int __init ibft_create_kobject(struct ibft_table_header *header,
 568                                        struct ibft_hdr *hdr,
 569                                        struct list_head *list)
 570 {
 571         struct ibft_kobject *ibft_kobj = NULL;
 572         struct ibft_nic *nic = (struct ibft_nic *)hdr;
 573         struct pci_dev *pci_dev;
 574         int rc = 0;
 575
 576         ibft_kobj = kzalloc(sizeof(*ibft_kobj), GFP_KERNEL);
 577         if (!ibft_kobj)
 578                 return -ENOMEM;
 579
 580         ibft_kobj->header = header;
 581         ibft_kobj->hdr = hdr;
 582
 583         switch (hdr->id) {
 584         case id_initiator:
 585                 rc = ibft_verify_hdr("initiator", hdr, id_initiator,
 586                                      sizeof(*ibft_kobj->initiator));
 587                 break;
 588         case id_nic:
 589                 rc = ibft_verify_hdr("ethernet", hdr, id_nic,
 590                                      sizeof(*ibft_kobj->nic));
 591                 break;
 592         case id_target:
 593                 rc = ibft_verify_hdr("target", hdr, id_target,
 594                                      sizeof(*ibft_kobj->tgt));
 595                 break;
 596         case id_reserved:
 597         case id_control:
 598         case id_extensions:
 599                 /* Fields which we don't support. Ignore them */
 600                 rc = 1;
 601                 break;
 602         default:
 603                 printk(KERN_ERR "iBFT has unknown structure type (%d). " \
 604                                 "Report this bug to %.6s!\n", hdr->id,
 605                                 header->oem_id);
 606                 rc = 1;
 607                 break;
 608         }
 609
 610         if (rc) {
 611                 /* Skip adding this kobject, but exit with non-fatal error. */
 612                 kfree(ibft_kobj);
 613                 goto out_invalid_struct;
 614         }
 615
 616         ibft_kobj->kobj.kset = ibft_kset;
 617
 618         rc = kobject_init_and_add(&ibft_kobj->kobj, &ibft_ktype,
 619                                   NULL, ibft_id_names[hdr->id], hdr->index);
 620
 621         if (rc) {
 622                 kfree(ibft_kobj);
 623                 goto out;
 624         }
 625
 626         kobject_uevent(&ibft_kobj->kobj, KOBJ_ADD);
 627
 628         if (hdr->id == id_nic) {
 629                 /*
 630                 * We don't search for the device in other domains than
 631                 * zero. This is because on x86 platforms the BIOS
 632                 * executes only devices which are in domain 0. Furthermore, the
 633                 * iBFT spec doesn't have a domain id field :-(
 634                 */
 635                 pci_dev = pci_get_bus_and_slot((nic->pci_bdf & 0xff00) >> 8,
 636                                                (nic->pci_bdf & 0xff));
 637                 if (pci_dev) {
 638                         rc = sysfs_create_link(&ibft_kobj->kobj,
 639                                                &pci_dev->dev.kobj, "device");
 640                         pci_dev_put(pci_dev);
 641                 }
 642         }
 643
 644         /* Nothing broke so lets add it to the list. */
 645         list_add_tail(&ibft_kobj->node, list);
 646 out:
 647         return rc;
 648 out_invalid_struct:
 649         /* Unsupported structs are skipped. */
 650         return 0;
 651 }
 652
 653 /*
 654  * Scan the IBFT table structure for the NIC and Target fields. When
 655  * found add them on the passed-in list. We do not support the other
 656  * fields at this point, so they are skipped.
 657  */
 658 static int __init ibft_register_kobjects(struct ibft_table_header *header,
 659                                           struct list_head *list)
 660 {
 661         struct ibft_control *control = NULL;
 662         void *ptr, *end;
 663         int rc = 0;
 664         u16 offset;
 665         u16 eot_offset;
 666
 667         control = (void *)header + sizeof(*header);
 668         end = (void *)control + control->hdr.length;
 669         eot_offset = (void *)header + header->length - (void *)control;
 670         rc = ibft_verify_hdr("control", (struct ibft_hdr *)control, id_control,
 671                              sizeof(*control));
 672
 673         /* iBFT table safety checking */
 674         rc |= ((control->hdr.index) ? -ENODEV : 0);
 675         if (rc) {
 676                 printk(KERN_ERR "iBFT error: Control header is invalid!\n");
 677                 return rc;
 678         }
 679         for (ptr = &control->initiator_off; ptr < end; ptr += sizeof(u16)) {
 680                 offset = *(u16 *)ptr;
 681                 if (offset && offset < header->length && offset < eot_offset) {
 682                         rc = ibft_create_kobject(header,
 683                                                  (void *)header + offset,
 684                                                  list);
 685                         if (rc)
 686                                 break;
 687                 }
 688         }
 689
 690         return rc;
 691 }
 692
 693 static void ibft_unregister(struct list_head *attr_list,
 694                              struct list_head *kobj_list)
 695 {
 696         struct ibft_kobject *data = NULL, *n;
 697         struct ibft_attribute *attr = NULL, *m;
 698
 699         list_for_each_entry_safe(attr, m, attr_list, node) {
 700                 sysfs_remove_file(attr->kobj, &attr->attr);
 701                 list_del(&attr->node);
 702                 kfree(attr);
 703         };
 704         list_del_init(attr_list);
 705
 706         list_for_each_entry_safe(data, n, kobj_list, node) {
 707                 list_del(&data->node);
 708                 if (data->hdr->id == id_nic)
 709                         sysfs_remove_link(&data->kobj, "device");
 710                 kobject_put(&data->kobj);
 711         };
 712         list_del_init(kobj_list);
 713 }
 714
 715 static int __init ibft_create_attribute(struct ibft_kobject *kobj_data,
 716                                          int type,
 717                                          const char *name,
 718                                          ssize_t (*show)(struct ibft_kobject *,
 719                                                          struct ibft_attribute*,
 720                                                          char *buf),
 721                                          struct list_head *list)
 722 {
 723         struct ibft_attribute *attr = NULL;
 724         struct ibft_hdr *hdr = kobj_data->hdr;
 725
 726         attr = kmalloc(sizeof(*attr), GFP_KERNEL);
 727         if (!attr)
 728                 return -ENOMEM;
 729
 730         attr->attr.name = name;
 731         attr->attr.mode = S_IRUSR;
 732
 733         attr->hdr = hdr;
 734         attr->show = show;
 735         attr->kobj = &kobj_data->kobj;
 736         attr->type = type;
 737
 738         list_add_tail(&attr->node, list);
 739
 740         return 0;
 741 }
 742
 743 /*
 744  * Helper routiners to check to determine if the entry is valid
 745  * in the proper iBFT structure.
 746  */
 747 static int __init ibft_check_nic_for(struct ibft_nic *nic, int entry)
 748 {
 749         int rc = 0;
 750
 751         switch (entry) {
 752         case ibft_eth_index:
 753         case ibft_eth_flags:
 754                 rc = 1;
 755                 break;
 756         case ibft_eth_ip_addr:
 757                 if (memcmp(nic->ip_addr, nulls, sizeof(nic->ip_addr)))
 758                         rc = 1;
 759                 break;
 760         case ibft_eth_subnet_mask:
 761                 if (nic->subnet_mask_prefix)
 762                         rc = 1;
 763                 break;
 764         case ibft_eth_origin:
 765                 rc = 1;
 766                 break;
 767         case ibft_eth_gateway:
 768                 if (memcmp(nic->gateway, nulls, sizeof(nic->gateway)))
 769                         rc = 1;
 770                 break;
 771         case ibft_eth_primary_dns:
 772                 if (memcmp(nic->primary_dns, nulls,
 773                            sizeof(nic->primary_dns)))
 774                         rc = 1;
 775                 break;
 776         case ibft_eth_secondary_dns:
 777                 if (memcmp(nic->secondary_dns, nulls,
 778                            sizeof(nic->secondary_dns)))
 779                         rc = 1;
 780                 break;
 781         case ibft_eth_dhcp:
 782                 if (memcmp(nic->dhcp, nulls, sizeof(nic->dhcp)))
 783                         rc = 1;
 784                 break;
 785         case ibft_eth_vlan:
 786         case ibft_eth_mac:
 787                 rc = 1;
 788                 break;
 789         case ibft_eth_hostname:
 790                 if (nic->hostname_off)
 791                         rc = 1;
 792                 break;
 793         default:
 794                 break;
 795         }
 796
 797         return rc;
 798 }
 799
 800 static int __init ibft_check_tgt_for(struct ibft_tgt *tgt, int entry)
 801 {
 802         int rc = 0;
 803
 804         switch (entry) {
 805         case ibft_tgt_index:
 806         case ibft_tgt_flags:
 807         case ibft_tgt_ip_addr:
 808         case ibft_tgt_port:
 809         case ibft_tgt_lun:
 810         case ibft_tgt_nic_assoc:
 811         case ibft_tgt_chap_type:
 812                 rc = 1;
 813         case ibft_tgt_name:
 814                 if (tgt->tgt_name_len)
 815                         rc = 1;
 816                 break;
 817         case ibft_tgt_chap_name:
 818         case ibft_tgt_chap_secret:
 819                 if (tgt->chap_name_len)
 820                         rc = 1;
 821                 break;
 822         case ibft_tgt_rev_chap_name:
 823         case ibft_tgt_rev_chap_secret:
 824                 if (tgt->rev_chap_name_len)
 825                         rc = 1;
 826                 break;
 827         default:
 828                 break;
 829         }
 830
 831         return rc;
 832 }
 833
 834 static int __init ibft_check_initiator_for(struct ibft_initiator *init,
 835                                             int entry)
 836 {
 837         int rc = 0;
 838
 839         switch (entry) {
 840         case ibft_init_index:
 841         case ibft_init_flags:
 842                 rc = 1;
 843                 break;
 844         case ibft_init_isns_server:
 845                 if (memcmp(init->isns_server, nulls,
 846                            sizeof(init->isns_server)))
 847                         rc = 1;
 848                 break;
 849         case ibft_init_slp_server:
 850                 if (memcmp(init->slp_server, nulls,
 851                            sizeof(init->slp_server)))
 852                         rc = 1;
 853                 break;
 854         case ibft_init_pri_radius_server:
 855                 if (memcmp(init->pri_radius_server, nulls,
 856                            sizeof(init->pri_radius_server)))
 857                         rc = 1;
 858                 break;
 859         case ibft_init_sec_radius_server:
 860                 if (memcmp(init->sec_radius_server, nulls,
 861                            sizeof(init->sec_radius_server)))
 862                         rc = 1;
 863                 break;
 864         case ibft_init_initiator_name:
 865                 if (init->initiator_name_len)
 866                         rc = 1;
 867                 break;
 868         default:
 869                 break;
 870         }
 871
 872         return rc;
 873 }
 874
 875 /*
 876  *  Register the attributes for all of the kobjects.
 877  */
 878 static int __init ibft_register_attributes(struct list_head *kobject_list,
 879                                             struct list_head *attr_list)
 880 {
 881         int rc = 0, i = 0;
 882         struct ibft_kobject *data = NULL;
 883         struct ibft_attribute *attr = NULL, *m;
 884
 885         list_for_each_entry(data, kobject_list, node) {
 886                 switch (data->hdr->id) {
 887                 case id_nic:
 888                         for (i = 0; i < ibft_eth_end_marker && !rc; i++)
 889                                 if (ibft_check_nic_for(data->nic, i))
 890                                         rc = ibft_create_attribute(data, i,
 891                                                 ibft_eth_properties[i],
 892                                                 ibft_attr_show_nic, attr_list);
 893                         break;
 894                 case id_target:
 895                         for (i = 0; i < ibft_tgt_end_marker && !rc; i++)
 896                                 if (ibft_check_tgt_for(data->tgt, i))
 897                                         rc = ibft_create_attribute(data, i,
 898                                                 ibft_tgt_properties[i],
 899                                                 ibft_attr_show_target,
 900                                                 attr_list);
 901                         break;
 902                 case id_initiator:
 903                         for (i = 0; i < ibft_init_end_marker && !rc; i++)
 904                                 if (ibft_check_initiator_for(
 905                                         data->initiator, i))
 906                                         rc = ibft_create_attribute(data, i,
 907                                                 ibft_initiator_properties[i],
 908                                                 ibft_attr_show_initiator,
 909                                                 attr_list);
 910                         break;
 911                 default:
 912                         break;
 913                 }
 914                 if (rc)
 915                         break;
 916         }
 917         list_for_each_entry_safe(attr, m, attr_list, node) {
 918                 rc = sysfs_create_file(attr->kobj, &attr->attr);
 919                 if (rc) {
 920                         list_del(&attr->node);
 921                         kfree(attr);
 922                         break;
 923                 }
 924         }
 925
 926         return rc;
 927 }
 928
 929 /*
 930  * ibft_init() - creates sysfs tree entries for the iBFT data.
 931  */
 932 static int __init ibft_init(void)
 933 {
 934         int rc = 0;
 935
 936         ibft_kset = kset_create_and_add("ibft", NULL, firmware_kobj);
 937         if (!ibft_kset)
 938                 return -ENOMEM;
 939
 940         if (ibft_addr) {
 941                 printk(KERN_INFO "iBFT detected at 0x%llx.\n",
 942                        (u64)virt_to_phys((void *)ibft_addr));
 943
 944                 rc = ibft_check_device();
 945                 if (rc)
 946                         goto out_firmware_unregister;
 947
 948                 /* Scan the IBFT for data and register the kobjects. */
 949                 rc = ibft_register_kobjects(ibft_addr, &ibft_kobject_list);
 950                 if (rc)
 951                         goto out_free;
 952
 953                 /* Register the attributes */
 954                 rc = ibft_register_attributes(&ibft_kobject_list,
 955                                               &ibft_attr_list);
 956                 if (rc)
 957                         goto out_free;
 958         } else
 959                 printk(KERN_INFO "No iBFT detected.\n");
 960
 961         return 0;
 962
 963 out_free:
 964         ibft_unregister(&ibft_attr_list, &ibft_kobject_list);
 965 out_firmware_unregister:
 966         kset_unregister(ibft_kset);
 967         return rc;
 968 }
 969
 970 static void __exit ibft_exit(void)
 971 {
 972         ibft_unregister(&ibft_attr_list, &ibft_kobject_list);
 973         kset_unregister(ibft_kset);
 974 }
 975
 976 module_init(ibft_init);
 977 module_exit(ibft_exit);