// SPDX-License-Identifier: GPL-2.0-only

  /*

   *  Copyright 2007-2010 Red Hat, Inc.

   *  by Peter Jones <pjones@redhat.com>
   *  Copyright 2008 IBM, Inc.
   *  by Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
   *  Copyright 2008
   *  by Konrad Rzeszutek <ketuzsezr@darnok.org>
   *
   * This code exposes the iSCSI Boot Format Table to userland via sysfs.
   *

   * Changelog:
   *

   *  06 Jan 2010 - Peter Jones <pjones@redhat.com>
   *    New changelog entries are in the git log from now on.  Not here.
   *

   *  14 Mar 2008 - Konrad Rzeszutek <ketuzsezr@darnok.org>
   *    Updated comments and copyrights. (v0.4.9)
   *
   *  11 Feb 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
   *    Converted to using ibft_addr. (v0.4.8)
   *
   *   8 Feb 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
   *    Combined two functions in one: reserve_ibft_region. (v0.4.7)
   *
   *  30 Jan 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
   *   Added logic to handle IPv6 addresses. (v0.4.6)
   *
   *  25 Jan 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
   *   Added logic to handle badly not-to-spec iBFT. (v0.4.5)
   *
   *   4 Jan 2008 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
   *   Added __init to function declarations. (v0.4.4)
   *
   *  21 Dec 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
   *   Updated kobject registration, combined unregister functions in one
   *   and code and style cleanup. (v0.4.3)
   *
   *   5 Dec 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
   *   Added end-markers to enums and re-organized kobject registration. (v0.4.2)
   *
   *   4 Dec 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
   *   Created 'device' sysfs link to the NIC and style cleanup. (v0.4.1)
   *
   *  28 Nov 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
   *   Added sysfs-ibft documentation, moved 'find_ibft' function to
   *   in its own file and added text attributes for every struct field.  (v0.4)
   *
   *  21 Nov 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
   *   Added text attributes emulating OpenFirmware /proc/device-tree naming.
   *   Removed binary /sysfs interface (v0.3)
   *
   *  29 Aug 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
   *   Added functionality in setup.c to reserve iBFT region. (v0.2)
   *
   *  27 Aug 2007 - Konrad Rzeszutek <konradr@linux.vnet.ibm.com>
   *   First version exposing iBFT data via a binary /sysfs. (v0.1)

   */
  
  
  #include <linux/blkdev.h>
  #include <linux/capability.h>
  #include <linux/ctype.h>
  #include <linux/device.h>
  #include <linux/err.h>
  #include <linux/init.h>
  #include <linux/iscsi_ibft.h>
  #include <linux/limits.h>
  #include <linux/module.h>
  #include <linux/pci.h>
  #include <linux/slab.h>
  #include <linux/stat.h>
  #include <linux/string.h>
  #include <linux/types.h>

  #include <linux/acpi.h>

  #include <linux/iscsi_boot_sysfs.h>

  #define IBFT_ISCSI_VERSION "0.5.0"
  #define IBFT_ISCSI_DATE "2010-Feb-25"

  MODULE_AUTHOR("Peter Jones <pjones@redhat.com> and "
  	      "Konrad Rzeszutek <ketuzsezr@darnok.org>");

  MODULE_DESCRIPTION("sysfs interface to BIOS iBFT information");
  MODULE_LICENSE("GPL");
  MODULE_VERSION(IBFT_ISCSI_VERSION);

  #ifndef CONFIG_ISCSI_IBFT_FIND
  struct acpi_table_ibft *ibft_addr;
  #endif

  struct ibft_hdr {
  	u8 id;
  	u8 version;
  	u16 length;
  	u8 index;
  	u8 flags;
  } __attribute__((__packed__));
  
  struct ibft_control {
  	struct ibft_hdr hdr;
  	u16 extensions;
  	u16 initiator_off;
  	u16 nic0_off;
  	u16 tgt0_off;
  	u16 nic1_off;
  	u16 tgt1_off;

  	u16 expansion[];

  } __attribute__((__packed__));
  
  struct ibft_initiator {
  	struct ibft_hdr hdr;
  	char isns_server[16];
  	char slp_server[16];
  	char pri_radius_server[16];
  	char sec_radius_server[16];
  	u16 initiator_name_len;
  	u16 initiator_name_off;
  } __attribute__((__packed__));
  
  struct ibft_nic {
  	struct ibft_hdr hdr;
  	char ip_addr[16];
  	u8 subnet_mask_prefix;
  	u8 origin;
  	char gateway[16];
  	char primary_dns[16];
  	char secondary_dns[16];
  	char dhcp[16];
  	u16 vlan;
  	char mac[6];
  	u16 pci_bdf;
  	u16 hostname_len;
  	u16 hostname_off;
  } __attribute__((__packed__));
  
  struct ibft_tgt {
  	struct ibft_hdr hdr;
  	char ip_addr[16];
  	u16 port;
  	char lun[8];
  	u8 chap_type;
  	u8 nic_assoc;
  	u16 tgt_name_len;
  	u16 tgt_name_off;
  	u16 chap_name_len;
  	u16 chap_name_off;
  	u16 chap_secret_len;
  	u16 chap_secret_off;
  	u16 rev_chap_name_len;
  	u16 rev_chap_name_off;
  	u16 rev_chap_secret_len;
  	u16 rev_chap_secret_off;
  } __attribute__((__packed__));
  
  /*
   * The kobject different types and its names.
   *
  */
  enum ibft_id {
  	id_reserved = 0, /* We don't support. */
  	id_control = 1, /* Should show up only once and is not exported. */
  	id_initiator = 2,
  	id_nic = 3,
  	id_target = 4,
  	id_extensions = 5, /* We don't support. */
  	id_end_marker,
  };
  
  /*

   * The kobject and attribute structures.
   */
  
  struct ibft_kobject {

  	struct acpi_table_ibft *header;

  	union {
  		struct ibft_initiator *initiator;
  		struct ibft_nic *nic;
  		struct ibft_tgt *tgt;
  		struct ibft_hdr *hdr;
  	};

  };

  static struct iscsi_boot_kset *boot_kset;

  /* fully null address */

  static const char nulls[16];

  /* IPv4-mapped IPv6 ::ffff:0.0.0.0 */
  static const char mapped_nulls[16] = { 0x00, 0x00, 0x00, 0x00,
                                         0x00, 0x00, 0x00, 0x00,
                                         0x00, 0x00, 0xff, 0xff,
                                         0x00, 0x00, 0x00, 0x00 };
  
  static int address_not_null(u8 *ip)
  {
  	return (memcmp(ip, nulls, 16) && memcmp(ip, mapped_nulls, 16));
  }

  /*
   * Helper functions to parse data properly.
   */
  static ssize_t sprintf_ipaddr(char *buf, u8 *ip)
  {
  	char *str = buf;
  
  	if (ip[0] == 0 && ip[1] == 0 && ip[2] == 0 && ip[3] == 0 &&
  	    ip[4] == 0 && ip[5] == 0 && ip[6] == 0 && ip[7] == 0 &&
  	    ip[8] == 0 && ip[9] == 0 && ip[10] == 0xff && ip[11] == 0xff) {
  		/*
  		 * IPV4
  		 */

  		str += sprintf(buf, "%pI4", ip + 12);

  	} else {
  		/*
  		 * IPv6
  		 */

  		str += sprintf(str, "%pI6", ip);

  	}
  	str += sprintf(str, "
  ");
  	return str - buf;
  }
  
  static ssize_t sprintf_string(char *str, int len, char *buf)
  {
  	return sprintf(str, "%.*s
  ", len, buf);
  }
  
  /*
   * Helper function to verify the IBFT header.
   */
  static int ibft_verify_hdr(char *t, struct ibft_hdr *hdr, int id, int length)
  {
  	if (hdr->id != id) {

  		printk(KERN_ERR "iBFT error: We expected the %s " \

  				"field header.id to have %d but " \

  				"found %d instead!
  ", t, id, hdr->id);

  		return -ENODEV;
  	}

  	if (length && hdr->length != length) {

  		printk(KERN_ERR "iBFT error: We expected the %s " \

  				"field header.length to have %d but " \

  				"found %d instead!
  ", t, length, hdr->length);

  		return -ENODEV;
  	}
  
  	return 0;
  }

  /*
   *  Routines for parsing the iBFT data to be human readable.
   */

  static ssize_t ibft_attr_show_initiator(void *data, int type, char *buf)

  {

  	struct ibft_kobject *entry = data;

  	struct ibft_initiator *initiator = entry->initiator;
  	void *ibft_loc = entry->header;
  	char *str = buf;
  
  	if (!initiator)
  		return 0;

  	switch (type) {
  	case ISCSI_BOOT_INI_INDEX:

  		str += sprintf(str, "%d
  ", initiator->hdr.index);
  		break;

  	case ISCSI_BOOT_INI_FLAGS:

  		str += sprintf(str, "%d
  ", initiator->hdr.flags);
  		break;

  	case ISCSI_BOOT_INI_ISNS_SERVER:

  		str += sprintf_ipaddr(str, initiator->isns_server);
  		break;

  	case ISCSI_BOOT_INI_SLP_SERVER:

  		str += sprintf_ipaddr(str, initiator->slp_server);
  		break;

  	case ISCSI_BOOT_INI_PRI_RADIUS_SERVER:

  		str += sprintf_ipaddr(str, initiator->pri_radius_server);
  		break;

  	case ISCSI_BOOT_INI_SEC_RADIUS_SERVER:

  		str += sprintf_ipaddr(str, initiator->sec_radius_server);
  		break;

  	case ISCSI_BOOT_INI_INITIATOR_NAME:

  		str += sprintf_string(str, initiator->initiator_name_len,
  				      (char *)ibft_loc +
  				      initiator->initiator_name_off);
  		break;
  	default:
  		break;
  	}
  
  	return str - buf;
  }

  static ssize_t ibft_attr_show_nic(void *data, int type, char *buf)

  {

  	struct ibft_kobject *entry = data;

  	struct ibft_nic *nic = entry->nic;
  	void *ibft_loc = entry->header;
  	char *str = buf;

  	__be32 val;

  
  	if (!nic)
  		return 0;

  	switch (type) {
  	case ISCSI_BOOT_ETH_INDEX:

  		str += sprintf(str, "%d
  ", nic->hdr.index);
  		break;

  	case ISCSI_BOOT_ETH_FLAGS:

  		str += sprintf(str, "%d
  ", nic->hdr.flags);
  		break;

  	case ISCSI_BOOT_ETH_IP_ADDR:

  		str += sprintf_ipaddr(str, nic->ip_addr);
  		break;

  	case ISCSI_BOOT_ETH_SUBNET_MASK:

  		val = cpu_to_be32(~((1 << (32-nic->subnet_mask_prefix))-1));
  		str += sprintf(str, "%pI4", &val);

  		break;

  	case ISCSI_BOOT_ETH_PREFIX_LEN:
  		str += sprintf(str, "%d
  ", nic->subnet_mask_prefix);
  		break;

  	case ISCSI_BOOT_ETH_ORIGIN:

  		str += sprintf(str, "%d
  ", nic->origin);
  		break;

  	case ISCSI_BOOT_ETH_GATEWAY:

  		str += sprintf_ipaddr(str, nic->gateway);
  		break;

  	case ISCSI_BOOT_ETH_PRIMARY_DNS:

  		str += sprintf_ipaddr(str, nic->primary_dns);
  		break;

  	case ISCSI_BOOT_ETH_SECONDARY_DNS:

  		str += sprintf_ipaddr(str, nic->secondary_dns);
  		break;

  	case ISCSI_BOOT_ETH_DHCP:

  		str += sprintf_ipaddr(str, nic->dhcp);
  		break;

  	case ISCSI_BOOT_ETH_VLAN:

  		str += sprintf(str, "%d
  ", nic->vlan);
  		break;

  	case ISCSI_BOOT_ETH_MAC:

  		str += sprintf(str, "%pM
  ", nic->mac);

  		break;

  	case ISCSI_BOOT_ETH_HOSTNAME:

  		str += sprintf_string(str, nic->hostname_len,
  				      (char *)ibft_loc + nic->hostname_off);
  		break;
  	default:
  		break;
  	}
  
  	return str - buf;
  };

  static ssize_t ibft_attr_show_target(void *data, int type, char *buf)

  {

  	struct ibft_kobject *entry = data;

  	struct ibft_tgt *tgt = entry->tgt;
  	void *ibft_loc = entry->header;
  	char *str = buf;
  	int i;
  
  	if (!tgt)
  		return 0;

  	switch (type) {
  	case ISCSI_BOOT_TGT_INDEX:

  		str += sprintf(str, "%d
  ", tgt->hdr.index);
  		break;

  	case ISCSI_BOOT_TGT_FLAGS:

  		str += sprintf(str, "%d
  ", tgt->hdr.flags);
  		break;

  	case ISCSI_BOOT_TGT_IP_ADDR:

  		str += sprintf_ipaddr(str, tgt->ip_addr);
  		break;

  	case ISCSI_BOOT_TGT_PORT:

  		str += sprintf(str, "%d
  ", tgt->port);
  		break;

  	case ISCSI_BOOT_TGT_LUN:

  		for (i = 0; i < 8; i++)
  			str += sprintf(str, "%x", (u8)tgt->lun[i]);
  		str += sprintf(str, "
  ");
  		break;

  	case ISCSI_BOOT_TGT_NIC_ASSOC:

  		str += sprintf(str, "%d
  ", tgt->nic_assoc);
  		break;

  	case ISCSI_BOOT_TGT_CHAP_TYPE:

  		str += sprintf(str, "%d
  ", tgt->chap_type);
  		break;

  	case ISCSI_BOOT_TGT_NAME:

  		str += sprintf_string(str, tgt->tgt_name_len,
  				      (char *)ibft_loc + tgt->tgt_name_off);
  		break;

  	case ISCSI_BOOT_TGT_CHAP_NAME:

  		str += sprintf_string(str, tgt->chap_name_len,
  				      (char *)ibft_loc + tgt->chap_name_off);
  		break;

  	case ISCSI_BOOT_TGT_CHAP_SECRET:

  		str += sprintf_string(str, tgt->chap_secret_len,
  				      (char *)ibft_loc + tgt->chap_secret_off);
  		break;

  	case ISCSI_BOOT_TGT_REV_CHAP_NAME:

  		str += sprintf_string(str, tgt->rev_chap_name_len,
  				      (char *)ibft_loc +
  				      tgt->rev_chap_name_off);
  		break;

  	case ISCSI_BOOT_TGT_REV_CHAP_SECRET:

  		str += sprintf_string(str, tgt->rev_chap_secret_len,
  				      (char *)ibft_loc +
  				      tgt->rev_chap_secret_off);
  		break;
  	default:
  		break;
  	}
  
  	return str - buf;
  }

  static ssize_t ibft_attr_show_acpitbl(void *data, int type, char *buf)
  {
  	struct ibft_kobject *entry = data;
  	char *str = buf;
  
  	switch (type) {
  	case ISCSI_BOOT_ACPITBL_SIGNATURE:

  		str += sprintf_string(str, ACPI_NAMESEG_SIZE,

  				      entry->header->header.signature);
  		break;
  	case ISCSI_BOOT_ACPITBL_OEM_ID:
  		str += sprintf_string(str, ACPI_OEM_ID_SIZE,
  				      entry->header->header.oem_id);
  		break;
  	case ISCSI_BOOT_ACPITBL_OEM_TABLE_ID:
  		str += sprintf_string(str, ACPI_OEM_TABLE_ID_SIZE,
  				      entry->header->header.oem_table_id);
  		break;
  	default:
  		break;
  	}
  
  	return str - buf;
  }

  static int __init ibft_check_device(void)
  {
  	int len;
  	u8 *pos;
  	u8 csum = 0;

  	len = ibft_addr->header.length;

  
  	/* Sanity checking of iBFT. */

  	if (ibft_addr->header.revision != 1) {

  		printk(KERN_ERR "iBFT module supports only revision 1, " \

  				"while this is %d.
  ",
  				ibft_addr->header.revision);

  		return -ENOENT;
  	}
  	for (pos = (u8 *)ibft_addr; pos < (u8 *)ibft_addr + len; pos++)
  		csum += *pos;
  
  	if (csum) {
  		printk(KERN_ERR "iBFT has incorrect checksum (0x%x)!
  ", csum);
  		return -ENOENT;
  	}
  
  	return 0;
  }
  
  /*

   * Helper routiners to check to determine if the entry is valid
   * in the proper iBFT structure.
   */

  static umode_t ibft_check_nic_for(void *data, int type)

  {
  	struct ibft_kobject *entry = data;
  	struct ibft_nic *nic = entry->nic;

  	umode_t rc = 0;

  
  	switch (type) {
  	case ISCSI_BOOT_ETH_INDEX:
  	case ISCSI_BOOT_ETH_FLAGS:
  		rc = S_IRUGO;
  		break;
  	case ISCSI_BOOT_ETH_IP_ADDR:

  		if (address_not_null(nic->ip_addr))

  			rc = S_IRUGO;
  		break;

  	case ISCSI_BOOT_ETH_PREFIX_LEN:

  	case ISCSI_BOOT_ETH_SUBNET_MASK:
  		if (nic->subnet_mask_prefix)
  			rc = S_IRUGO;
  		break;
  	case ISCSI_BOOT_ETH_ORIGIN:
  		rc = S_IRUGO;
  		break;
  	case ISCSI_BOOT_ETH_GATEWAY:

  		if (address_not_null(nic->gateway))

  			rc = S_IRUGO;
  		break;
  	case ISCSI_BOOT_ETH_PRIMARY_DNS:

  		if (address_not_null(nic->primary_dns))

  			rc = S_IRUGO;
  		break;
  	case ISCSI_BOOT_ETH_SECONDARY_DNS:

  		if (address_not_null(nic->secondary_dns))

  			rc = S_IRUGO;
  		break;
  	case ISCSI_BOOT_ETH_DHCP:

  		if (address_not_null(nic->dhcp))

  			rc = S_IRUGO;
  		break;
  	case ISCSI_BOOT_ETH_VLAN:
  	case ISCSI_BOOT_ETH_MAC:
  		rc = S_IRUGO;
  		break;
  	case ISCSI_BOOT_ETH_HOSTNAME:
  		if (nic->hostname_off)
  			rc = S_IRUGO;
  		break;
  	default:
  		break;
  	}
  
  	return rc;
  }

  static umode_t __init ibft_check_tgt_for(void *data, int type)

  {
  	struct ibft_kobject *entry = data;
  	struct ibft_tgt *tgt = entry->tgt;

  	umode_t rc = 0;

  
  	switch (type) {
  	case ISCSI_BOOT_TGT_INDEX:
  	case ISCSI_BOOT_TGT_FLAGS:
  	case ISCSI_BOOT_TGT_IP_ADDR:
  	case ISCSI_BOOT_TGT_PORT:
  	case ISCSI_BOOT_TGT_LUN:
  	case ISCSI_BOOT_TGT_NIC_ASSOC:
  	case ISCSI_BOOT_TGT_CHAP_TYPE:
  		rc = S_IRUGO;

  		break;

  	case ISCSI_BOOT_TGT_NAME:
  		if (tgt->tgt_name_len)
  			rc = S_IRUGO;
  		break;
  	case ISCSI_BOOT_TGT_CHAP_NAME:
  	case ISCSI_BOOT_TGT_CHAP_SECRET:
  		if (tgt->chap_name_len)
  			rc = S_IRUGO;
  		break;
  	case ISCSI_BOOT_TGT_REV_CHAP_NAME:
  	case ISCSI_BOOT_TGT_REV_CHAP_SECRET:
  		if (tgt->rev_chap_name_len)
  			rc = S_IRUGO;
  		break;
  	default:
  		break;
  	}
  
  	return rc;
  }

  static umode_t __init ibft_check_initiator_for(void *data, int type)

  {
  	struct ibft_kobject *entry = data;
  	struct ibft_initiator *init = entry->initiator;

  	umode_t rc = 0;

  
  	switch (type) {
  	case ISCSI_BOOT_INI_INDEX:
  	case ISCSI_BOOT_INI_FLAGS:
  		rc = S_IRUGO;
  		break;
  	case ISCSI_BOOT_INI_ISNS_SERVER:

  		if (address_not_null(init->isns_server))

  			rc = S_IRUGO;
  		break;
  	case ISCSI_BOOT_INI_SLP_SERVER:

  		if (address_not_null(init->slp_server))

  			rc = S_IRUGO;
  		break;
  	case ISCSI_BOOT_INI_PRI_RADIUS_SERVER:

  		if (address_not_null(init->pri_radius_server))

  			rc = S_IRUGO;
  		break;
  	case ISCSI_BOOT_INI_SEC_RADIUS_SERVER:

  		if (address_not_null(init->sec_radius_server))

  			rc = S_IRUGO;
  		break;
  	case ISCSI_BOOT_INI_INITIATOR_NAME:
  		if (init->initiator_name_len)
  			rc = S_IRUGO;
  		break;
  	default:
  		break;
  	}
  
  	return rc;
  }

  static umode_t __init ibft_check_acpitbl_for(void *data, int type)
  {
  
  	umode_t rc = 0;
  
  	switch (type) {
  	case ISCSI_BOOT_ACPITBL_SIGNATURE:
  	case ISCSI_BOOT_ACPITBL_OEM_ID:
  	case ISCSI_BOOT_ACPITBL_OEM_TABLE_ID:
  		rc = S_IRUGO;
  		break;
  	default:
  		break;
  	}
  
  	return rc;
  }

  static void ibft_kobj_release(void *data)
  {
  	kfree(data);
  }

  /*

   * Helper function for ibft_register_kobjects.
   */

  static int __init ibft_create_kobject(struct acpi_table_ibft *header,

  				      struct ibft_hdr *hdr)

  {

  	struct iscsi_boot_kobj *boot_kobj = NULL;

  	struct ibft_kobject *ibft_kobj = NULL;
  	struct ibft_nic *nic = (struct ibft_nic *)hdr;
  	struct pci_dev *pci_dev;
  	int rc = 0;
  
  	ibft_kobj = kzalloc(sizeof(*ibft_kobj), GFP_KERNEL);
  	if (!ibft_kobj)
  		return -ENOMEM;
  
  	ibft_kobj->header = header;
  	ibft_kobj->hdr = hdr;
  
  	switch (hdr->id) {
  	case id_initiator:
  		rc = ibft_verify_hdr("initiator", hdr, id_initiator,
  				     sizeof(*ibft_kobj->initiator));

  		if (rc)
  			break;
  
  		boot_kobj = iscsi_boot_create_initiator(boot_kset, hdr->index,
  						ibft_kobj,
  						ibft_attr_show_initiator,

  						ibft_check_initiator_for,
  						ibft_kobj_release);

  		if (!boot_kobj) {
  			rc = -ENOMEM;
  			goto free_ibft_obj;
  		}

  		break;
  	case id_nic:
  		rc = ibft_verify_hdr("ethernet", hdr, id_nic,
  				     sizeof(*ibft_kobj->nic));

  		if (rc)
  			break;
  
  		boot_kobj = iscsi_boot_create_ethernet(boot_kset, hdr->index,
  						       ibft_kobj,
  						       ibft_attr_show_nic,

  						       ibft_check_nic_for,
  						       ibft_kobj_release);

  		if (!boot_kobj) {
  			rc = -ENOMEM;
  			goto free_ibft_obj;
  		}

  		break;
  	case id_target:
  		rc = ibft_verify_hdr("target", hdr, id_target,
  				     sizeof(*ibft_kobj->tgt));

  		if (rc)
  			break;
  
  		boot_kobj = iscsi_boot_create_target(boot_kset, hdr->index,
  						     ibft_kobj,
  						     ibft_attr_show_target,

  						     ibft_check_tgt_for,
  						     ibft_kobj_release);

  		if (!boot_kobj) {
  			rc = -ENOMEM;
  			goto free_ibft_obj;
  		}

  		break;
  	case id_reserved:
  	case id_control:
  	case id_extensions:
  		/* Fields which we don't support. Ignore them */
  		rc = 1;
  		break;
  	default:
  		printk(KERN_ERR "iBFT has unknown structure type (%d). " \
  				"Report this bug to %.6s!
  ", hdr->id,

  				header->header.oem_id);

  		rc = 1;
  		break;
  	}
  
  	if (rc) {
  		/* Skip adding this kobject, but exit with non-fatal error. */

  		rc = 0;
  		goto free_ibft_obj;

  	}

  	if (hdr->id == id_nic) {
  		/*
  		* We don't search for the device in other domains than
  		* zero. This is because on x86 platforms the BIOS
  		* executes only devices which are in domain 0. Furthermore, the
  		* iBFT spec doesn't have a domain id field :-(
  		*/

  		pci_dev = pci_get_domain_bus_and_slot(0,
  						(nic->pci_bdf & 0xff00) >> 8,
  						(nic->pci_bdf & 0xff));

  		if (pci_dev) {

  			rc = sysfs_create_link(&boot_kobj->kobj,

  					       &pci_dev->dev.kobj, "device");
  			pci_dev_put(pci_dev);
  		}
  	}

  	return 0;

  free_ibft_obj:
  	kfree(ibft_kobj);

  	return rc;

  }
  
  /*
   * Scan the IBFT table structure for the NIC and Target fields. When
   * found add them on the passed-in list. We do not support the other
   * fields at this point, so they are skipped.
   */

  static int __init ibft_register_kobjects(struct acpi_table_ibft *header)

  {
  	struct ibft_control *control = NULL;

  	struct iscsi_boot_kobj *boot_kobj;
  	struct ibft_kobject *ibft_kobj;

  	void *ptr, *end;
  	int rc = 0;
  	u16 offset;
  	u16 eot_offset;
  
  	control = (void *)header + sizeof(*header);
  	end = (void *)control + control->hdr.length;

  	eot_offset = (void *)header + header->header.length - (void *)control;

  	rc = ibft_verify_hdr("control", (struct ibft_hdr *)control, id_control, 0);

  
  	/* iBFT table safety checking */
  	rc |= ((control->hdr.index) ? -ENODEV : 0);

  	rc |= ((control->hdr.length < sizeof(*control)) ? -ENODEV : 0);

  	if (rc) {
  		printk(KERN_ERR "iBFT error: Control header is invalid!
  ");
  		return rc;
  	}

  	for (ptr = &control->initiator_off; ptr + sizeof(u16) <= end; ptr += sizeof(u16)) {

  		offset = *(u16 *)ptr;

  		if (offset && offset < header->header.length &&
  						offset < eot_offset) {

  			rc = ibft_create_kobject(header,

  						 (void *)header + offset);

  			if (rc)
  				break;
  		}
  	}

  	if (rc)
  		return rc;
  
  	ibft_kobj = kzalloc(sizeof(*ibft_kobj), GFP_KERNEL);
  	if (!ibft_kobj)
  		return -ENOMEM;
  
  	ibft_kobj->header = header;
  	ibft_kobj->hdr = NULL; /*for ibft_unregister*/
  
  	boot_kobj = iscsi_boot_create_acpitbl(boot_kset, 0,
  					ibft_kobj,
  					ibft_attr_show_acpitbl,
  					ibft_check_acpitbl_for,
  					ibft_kobj_release);
  	if (!boot_kobj)  {
  		kfree(ibft_kobj);
  		rc = -ENOMEM;
  	}

  
  	return rc;
  }

  static void ibft_unregister(void)

  {

  	struct iscsi_boot_kobj *boot_kobj, *tmp_kobj;
  	struct ibft_kobject *ibft_kobj;
  
  	list_for_each_entry_safe(boot_kobj, tmp_kobj,
  				 &boot_kset->kobj_list, list) {
  		ibft_kobj = boot_kobj->data;

  		if (ibft_kobj->hdr && ibft_kobj->hdr->id == id_nic)

  			sysfs_remove_link(&boot_kobj->kobj, "device");

  	};

  }

  static void ibft_cleanup(void)

  {

  	if (boot_kset) {
  		ibft_unregister();
  		iscsi_boot_destroy_kset(boot_kset);
  	}

  }

  static void __exit ibft_exit(void)

  {

  	ibft_cleanup();

  }

  #ifdef CONFIG_ACPI
  static const struct {
  	char *sign;
  } ibft_signs[] = {
  	/*
  	 * One spec says "IBFT", the other says "iBFT". We have to check
  	 * for both.
  	 */
  	{ ACPI_SIG_IBFT },
  	{ "iBFT" },

  	{ "BIFT" },	/* Broadcom iSCSI Offload */

  };
  
  static void __init acpi_find_ibft_region(void)
  {
  	int i;
  	struct acpi_table_header *table = NULL;
  
  	if (acpi_disabled)
  		return;
  
  	for (i = 0; i < ARRAY_SIZE(ibft_signs) && !ibft_addr; i++) {
  		acpi_get_table(ibft_signs[i].sign, 0, &table);
  		ibft_addr = (struct acpi_table_ibft *)table;
  	}
  }
  #else
  static void __init acpi_find_ibft_region(void)
  {
  }
  #endif

  /*
   * ibft_init() - creates sysfs tree entries for the iBFT data.
   */
  static int __init ibft_init(void)
  {
  	int rc = 0;

  	/*
  	   As on UEFI systems the setup_arch()/find_ibft_region()
  	   is called before ACPI tables are parsed and it only does
  	   legacy finding.
  	*/
  	if (!ibft_addr)
  		acpi_find_ibft_region();

  	if (ibft_addr) {

  		pr_info("iBFT detected.
  ");

  
  		rc = ibft_check_device();
  		if (rc)

  			return rc;

  		boot_kset = iscsi_boot_create_kset("ibft");
  		if (!boot_kset)
  			return -ENOMEM;

  		/* Scan the IBFT for data and register the kobjects. */
  		rc = ibft_register_kobjects(ibft_addr);

  		if (rc)
  			goto out_free;
  	} else
  		printk(KERN_INFO "No iBFT detected.
  ");
  
  	return 0;
  
  out_free:

  	ibft_cleanup();

  	return rc;
  }

  module_init(ibft_init);
  module_exit(ibft_exit);