/*
* Export the iSCSI boot info to userland via sysfs.
*
* Copyright (C) 2010 Red Hat, Inc. All rights reserved.
* Copyright (C) 2010 Mike Christie
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License v2.0 as published by
* the Free Software Foundation
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/module.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/sysfs.h>
#include <linux/capability.h>
#include <linux/iscsi_boot_sysfs.h>
MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>");
MODULE_DESCRIPTION("sysfs interface and helpers to export iSCSI boot information");
MODULE_LICENSE("GPL");
/*
* The kobject and attribute structures.
*/
struct iscsi_boot_attr {
struct attribute attr;
int type;
ssize_t (*show) (void *data, int type, char *buf);
};
/*
* The routine called for all sysfs attributes.
*/
static ssize_t iscsi_boot_show_attribute(struct kobject *kobj,
struct attribute *attr, char *buf)
{
struct iscsi_boot_kobj *boot_kobj =
container_of(kobj, struct iscsi_boot_kobj, kobj);
struct iscsi_boot_attr *boot_attr =
container_of(attr, struct iscsi_boot_attr, attr);
ssize_t ret = -EIO;
char *str = buf;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
if (boot_kobj->show)
ret = boot_kobj->show(boot_kobj->data, boot_attr->type, str);
return ret;
}
static const struct sysfs_ops iscsi_boot_attr_ops = {
.show = iscsi_boot_show_attribute,
};
static void iscsi_boot_kobj_release(struct kobject *kobj)
{
struct iscsi_boot_kobj *boot_kobj =
container_of(kobj, struct iscsi_boot_kobj, kobj);
kfree(boot_kobj->data);
kfree(boot_kobj);
}
static struct kobj_type iscsi_boot_ktype = {
.release = iscsi_boot_kobj_release,
.sysfs_ops = &iscsi_boot_attr_ops,
};
#define iscsi_boot_rd_attr(fnname, sysfs_name, attr_type) \
static struct iscsi_boot_attr iscsi_boot_attr_##fnname = { \
.attr = { .name = __stringify(sysfs_name), .mode = 0444 }, \
.type = attr_type, \
}
/* Target attrs */
iscsi_boot_rd_attr(tgt_index, index, ISCSI_BOOT_TGT_INDEX);
iscsi_boot_rd_attr(tgt_flags, flags, ISCSI_BOOT_TGT_FLAGS);
iscsi_boot_rd_attr(tgt_ip, ip-addr, ISCSI_BOOT_TGT_IP_ADDR);
iscsi_boot_rd_attr(tgt_port, port, ISCSI_BOOT_TGT_PORT);
iscsi_boot_rd_attr(tgt_lun, lun, ISCSI_BOOT_TGT_LUN);
iscsi_boot_rd_attr(tgt_chap, chap-type, ISCSI_BOOT_TGT_CHAP_TYPE);
iscsi_boot_rd_attr(tgt_nic, nic-assoc, ISCSI_BOOT_TGT_NIC_ASSOC);
iscsi_boot_rd_attr(tgt_name, target-name, ISCSI_BOOT_TGT_NAME);
iscsi_boot_rd_attr(tgt_chap_name, chap-name, ISCSI_BOOT_TGT_CHAP_NAME);
iscsi_boot_rd_attr(tgt_chap_secret, chap-secret, ISCSI_BOOT_TGT_CHAP_SECRET);
iscsi_boot_rd_attr(tgt_chap_rev_name, rev-chap-name,
ISCSI_BOOT_TGT_REV_CHAP_NAME);
iscsi_boot_rd_attr(tgt_chap_rev_secret, rev-chap-name-secret,
ISCSI_BOOT_TGT_REV_CHAP_SECRET);
static struct attribute *target_attrs[] = {
&iscsi_boot_attr_tgt_index.attr,
&iscsi_boot_attr_tgt_flags.attr,
&iscsi_boot_attr_tgt_ip.attr,
&iscsi_boot_attr_tgt_port.attr,
&iscsi_boot_attr_tgt_lun.attr,
&iscsi_boot_attr_tgt_chap.attr,
&iscsi_boot_attr_tgt_nic.attr,
&iscsi_boot_attr_tgt_name.attr,
&iscsi_boot_attr_tgt_chap_name.attr,
&iscsi_boot_attr_tgt_chap_secret.attr,
&iscsi_boot_attr_tgt_chap_rev_name.attr,
&iscsi_boot_attr_tgt_chap_rev_secret.attr,
NULL
};
static mode_t iscsi_boot_tgt_attr_is_visible(struct kobject *kobj,
struct attribute *attr, int i)
{
struct iscsi_boot_kobj *boot_kobj =
container_of(kobj, struct iscsi_boot_kobj, kobj);
if (attr == &iscsi_boot_attr_tgt_index.attr)
return boot_kobj->is_visible(boot_kobj->data,
ISCSI_BOOT_TGT_INDEX);
else if (attr == &iscsi_boot_attr_tgt_flags.attr)
return boot_kobj->is_visible(boot_kobj->data,
ISCSI_BOOT_TGT_FLAGS);
else if (attr == &iscsi_boot_attr_tgt_ip.attr)
return boot_kobj->is_visible(boot_kobj->data,
ISCSI_BOOT_TGT_IP_ADDR);
else if (attr == &iscsi_boot_attr_tgt_port.attr)
return boot_kobj->is_visible(boot_kobj->data,
ISCSI_BOOT_TGT_PORT);
else if (attr == &iscsi_boot_attr_tgt_lun.attr)
return boot_kobj->is_visible(boot_kobj->data,
ISCSI_BOOT_TGT_LUN);
else if (attr == &iscsi_boot_attr_tgt_chap.attr)
return boot_kobj->is_visible(boot_kobj->data,
ISCSI_BOOT_TGT_CHAP_TYPE);
else if (attr == &iscsi_boot_attr_tgt_nic.attr)
return boot_kobj->is_visible(boot_kobj->data,
ISCSI_BOOT_TGT_NIC_ASSOC);
else if (attr == &iscsi_boot_attr_tgt_name.attr)
return boot_kobj->is_visible(boot_kobj->data,
ISCSI_BOOT_TGT_NAME);
else if (attr == &iscsi_boot_attr_tgt_chap_name.attr)
return boot_kobj->is_visible(boot_kobj->data,
ISCSI_BOOT_TGT_CHAP_NAME);
else if (attr == &iscsi_boot_attr_tgt_chap_secret.attr)
return boot_kobj->is_visible(boot_kobj->data,
ISCSI_BOOT_TGT_CHAP_SECRET);
else if (attr == &iscsi_boot_attr_tgt_chap_rev_name.attr)
return boot_kobj->is_visible(boot_kobj->data,
ISCSI_BOOT_TGT_REV_CHAP_NAME);
else if (attr == &iscsi_boot_attr_tgt_chap_rev_secret.attr)
return boot_kobj->is_visible(boot_kobj->data,
ISCSI_BOOT_TGT_REV_CHAP_SECRET);
return 0;
}
static struct attribute_group iscsi_boot_target_attr_group = {
.attrs = target_attrs,
.is_visible = iscsi_boot_tgt_attr_is_visible,
};
/* Ethernet attrs */
iscsi_boot_rd_attr(eth_index, index, ISCSI_BOOT_ETH_INDEX);
iscsi_boot_rd_attr(eth_flags, flags, ISCSI_BOOT_ETH_FLAGS);
iscsi_boot_rd_attr(eth_ip, ip-addr, ISCSI_BOOT_ETH_IP_ADDR);
iscsi_boot_rd_attr(eth_subnet, subnet-mask, ISCSI_BOOT_ETH_SUBNET_MASK);
iscsi_boot_rd_attr(eth_origin, origin, ISCSI_BOOT_ETH_ORIGIN);
iscsi_boot_rd_attr(eth_gateway, gateway, ISCSI_BOOT_ETH_GATEWAY);
iscsi_boot_rd_attr(eth_primary_dns, primary-dns, ISCSI_BOOT_ETH_PRIMARY_DNS);
iscsi_boot_rd_attr(eth_secondary_dns, secondary-dns,
ISCSI_BOOT_ETH_SECONDARY_DNS);
iscsi_boot_rd_attr(eth_dhcp, dhcp, ISCSI_BOOT_ETH_DHCP);
iscsi_boot_rd_attr(eth_vlan, vlan, ISCSI_BOOT_ETH_VLAN);
iscsi_boot_rd_attr(eth_mac, mac, ISCSI_BOOT_ETH_MAC);
iscsi_boot_rd_attr(eth_hostname, hostname, ISCSI_BOOT_ETH_HOSTNAME);
static struct attribute *ethernet_attrs[] = {
&iscsi_boot_attr_eth_index.attr,
&iscsi_boot_attr_eth_flags.attr,
&iscsi_boot_attr_eth_ip.attr,
&iscsi_boot_attr_eth_subnet.attr,
&iscsi_boot_attr_eth_origin.attr,
&iscsi_boot_attr_eth_gateway.attr,
&iscsi_boot_attr_eth_primary_dns.attr,
&iscsi_boot_attr_eth_secondary_dns.attr,
&iscsi_boot_attr_eth_dhcp.attr,
&iscsi_boot_attr_eth_vlan.attr,
&iscsi_boot_attr_eth_mac.attr,
&iscsi_boot_attr_eth_hostname.attr,
NULL
};
static mode_t iscsi_boot_eth_attr_is_visible(struct kobject *kobj,
struct attribute *attr, int i)
{
struct iscsi_boot_kobj *boot_kobj =
container_of(kobj, struct iscsi_boot_kobj, kobj);
if (attr == &iscsi_boot_attr_eth_index.attr)
return boot_kobj->is_visible(boot_kobj->data,
ISCSI_BOOT_ETH_INDEX);
else if (attr == &iscsi_boot_attr_eth_flags.attr)
return boot_kobj->is_visible(boot_kobj->data,
ISCSI_BOOT_ETH_FLAGS);
else if (attr == &iscsi_boot_attr_eth_ip.attr)
return boot_kobj->is_visible(boot_kobj->data,
ISCSI_BOOT_ETH_IP_ADDR);
else if (attr == &iscsi_boot_attr_eth_subnet.attr)
return boot_kobj->is_visible(boot_kobj->data,
ISCSI_BOOT_ETH_SUBNET_MASK);
else if (attr == &iscsi_boot_attr_eth_origin.attr)
return boot_kobj->is_visible(boot_kobj->data,
ISCSI_BOOT_ETH_ORIGIN);
else if (attr == &iscsi_boot_attr_eth_gateway.attr)
return boot_kobj->is_visible(boot_kobj->data,
ISCSI_BOOT_ETH_GATEWAY);
else if (attr == &iscsi_boot_attr_eth_primary_dns.attr)
return boot_kobj->is_visible(boot_kobj->data,
ISCSI_BOOT_ETH_PRIMARY_DNS);
else if (attr == &iscsi_boot_attr_eth_secondary_dns.attr)
return boot_kobj->is_visible(boot_kobj->data,
ISCSI_BOOT_ETH_SECONDARY_DNS);
else if (attr == &iscsi_boot_attr_eth_dhcp.attr)
return boot_kobj->is_visible(boot_kobj->data,
ISCSI_BOOT_ETH_DHCP);
else if (attr == &iscsi_boot_attr_eth_vlan.attr)
return boot_kobj->is_visible(boot_kobj->data,
ISCSI_BOOT_ETH_VLAN);
else if (attr == &iscsi_boot_attr_eth_mac.attr)
return boot_kobj->is_visible(boot_kobj->data,
ISCSI_BOOT_ETH_MAC);
else if (attr == &iscsi_boot_attr_eth_hostname.attr)
return boot_kobj->is_visible(boot_kobj->data,
ISCSI_BOOT_ETH_HOSTNAME);
return 0;
}
static struct attribute_group iscsi_boot_ethernet_attr_group = {
.attrs = ethernet_attrs,
.is_visible = iscsi_boot_eth_attr_is_visible,
};
/* Initiator attrs */
iscsi_boot_rd_attr(ini_index, index, ISCSI_BOOT_INI_INDEX);
iscsi_boot_rd_attr(ini_flags, flags, ISCSI_BOOT_INI_FLAGS);
iscsi_boot_rd_attr(ini_isns, isns-server, ISCSI_BOOT_INI_ISNS_SERVER);
iscsi_boot_rd_attr(ini_slp, slp-server, ISCSI_BOOT_INI_SLP_SERVER);
iscsi_boot_rd_attr(ini_primary_radius, pri-radius-server,
ISCSI_BOOT_INI_PRI_RADIUS_SERVER);
iscsi_boot_rd_attr(ini_secondary_radius, sec-radius-server,
ISCSI_BOOT_INI_SEC_RADIUS_SERVER);
iscsi_boot_rd_attr(ini_name, initiator-name, ISCSI_BOOT_INI_INITIATOR_NAME);
static struct attribute *initiator_attrs[] = {
&iscsi_boot_attr_ini_index.attr,
&iscsi_boot_attr_ini_flags.attr,
&iscsi_boot_attr_ini_isns.attr,
&iscsi_boot_attr_ini_slp.attr,
&iscsi_boot_attr_ini_primary_radius.attr,
&iscsi_boot_attr_ini_secondary_radius.attr,
&iscsi_boot_attr_ini_name.attr,
NULL
};
static mode_t iscsi_boot_ini_attr_is_visible(struct kobject *kobj,
struct attribute *attr, int i)
{
struct iscsi_boot_kobj *boot_kobj =
container_of(kobj, struct iscsi_boot_kobj, kobj);
if (attr == &iscsi_boot_attr_ini_index.attr)
return boot_kobj->is_visible(boot_kobj->data,
ISCSI_BOOT_INI_INDEX);
if (attr == &iscsi_boot_attr_ini_flags.attr)
return boot_kobj->is_visible(boot_kobj->data,
ISCSI_BOOT_INI_FLAGS);
if (attr == &iscsi_boot_attr_ini_isns.attr)
return boot_kobj->is_visible(boot_kobj->data,
ISCSI_BOOT_INI_ISNS_SERVER);
if (attr == &iscsi_boot_attr_ini_slp.attr)
return boot_kobj->is_visible(boot_kobj->data,
ISCSI_BOOT_INI_SLP_SERVER);
if (attr == &iscsi_boot_attr_ini_primary_radius.attr)
return boot_kobj->is_visible(boot_kobj->data,
ISCSI_BOOT_INI_PRI_RADIUS_SERVER);
if (attr == &iscsi_boot_attr_ini_secondary_radius.attr)
return boot_kobj->is_visible(boot_kobj->data,
ISCSI_BOOT_INI_SEC_RADIUS_SERVER);
if (attr == &iscsi_boot_attr_ini_name.attr)
return boot_kobj->is_visible(boot_kobj->data,
ISCSI_BOOT_INI_INITIATOR_NAME);
return 0;
}
static struct attribute_group iscsi_boot_initiator_attr_group = {
.attrs = initiator_attrs,
.is_visible = iscsi_boot_ini_attr_is_visible,
};
static struct iscsi_boot_kobj *
iscsi_boot_create_kobj(struct iscsi_boot_kset *boot_kset,
struct attribute_group *attr_group,
const char *name, int index, void *data,
ssize_t (*show) (void *data, int type, char *buf),
mode_t (*is_visible) (void *data, int type))
{
struct iscsi_boot_kobj *boot_kobj;
boot_kobj = kzalloc(sizeof(*boot_kobj), GFP_KERNEL);
if (!boot_kobj)
return NULL;
INIT_LIST_HEAD(&boot_kobj->list);
boot_kobj->kobj.kset = boot_kset->kset;
if (kobject_init_and_add(&boot_kobj->kobj, &iscsi_boot_ktype,
NULL, name, index)) {
kfree(boot_kobj);
return NULL;
}
boot_kobj->data = data;
boot_kobj->show = show;
boot_kobj->is_visible = is_visible;
if (sysfs_create_group(&boot_kobj->kobj, attr_group)) {
/*
* We do not want to free this because the caller
* will assume that since the creation call failed
* the boot kobj was not setup and the normal release
* path is not being run.
*/
boot_kobj->data = NULL;
kobject_put(&boot_kobj->kobj);
return NULL;
}
boot_kobj->attr_group = attr_group;
kobject_uevent(&boot_kobj->kobj, KOBJ_ADD);
/* Nothing broke so lets add it to the list. */
list_add_tail(&boot_kobj->list, &boot_kset->kobj_list);
return boot_kobj;
}
static void iscsi_boot_remove_kobj(struct iscsi_boot_kobj *boot_kobj)
{
list_del(&boot_kobj->list);
sysfs_remove_group(&boot_kobj->kobj, boot_kobj->attr_group);
kobject_put(&boot_kobj->kobj);
}
/**
* iscsi_boot_create_target() - create boot target sysfs dir
* @boot_kset: boot kset
* @index: the target id
* @data: driver specific data for target
* @show: attr show function
* @is_visible: attr visibility function
*
* Note: The boot sysfs lib will free the data passed in for the caller
* when all refs to the target kobject have been released.
*/
struct iscsi_boot_kobj *
iscsi_boot_create_target(struct iscsi_boot_kset *boot_kset, int index,
void *data,
ssize_t (*show) (void *data, int type, char *buf),
mode_t (*is_visible) (void *data, int type))
{
return iscsi_boot_create_kobj(boot_kset, &iscsi_boot_target_attr_group,
"target%d", index, data, show, is_visible);
}
EXPORT_SYMBOL_GPL(iscsi_boot_create_target);
/**
* iscsi_boot_create_initiator() - create boot initiator sysfs dir
* @boot_kset: boot kset
* @index: the initiator id
* @data: driver specific data
* @show: attr show function
* @is_visible: attr visibility function
*
* Note: The boot sysfs lib will free the data passed in for the caller
* when all refs to the initiator kobject have been released.
*/
struct iscsi_boot_kobj *
iscsi_boot_create_initiator(struct iscsi_boot_kset *boot_kset, int index,
void *data,
ssize_t (*show) (void *data, int type, char *buf),
mode_t (*is_visible) (void *data, int type))
{
return iscsi_boot_create_kobj(boot_kset,
&iscsi_boot_initiator_attr_group,
"initiator", index, data, show,
is_visible);
}
EXPORT_SYMBOL_GPL(iscsi_boot_create_initiator);
/**
* iscsi_boot_create_ethernet() - create boot ethernet sysfs dir
* @boot_kset: boot kset
* @index: the ethernet device id
* @data: driver specific data
* @show: attr show function
* @is_visible: attr visibility function
*
* Note: The boot sysfs lib will free the data passed in for the caller
* when all refs to the ethernet kobject have been released.
*/
struct iscsi_boot_kobj *
iscsi_boot_create_ethernet(struct iscsi_boot_kset *boot_kset, int index,
void *data,
ssize_t (*show) (void *data, int type, char *buf),
mode_t (*is_visible) (void *data, int type))
{
return iscsi_boot_create_kobj(boot_kset,
&iscsi_boot_ethernet_attr_group,
"ethernet%d", index, data, show,
is_visible);
}
EXPORT_SYMBOL_GPL(iscsi_boot_create_ethernet);
/**
* iscsi_boot_create_kset() - creates root sysfs tree
* @set_name: name of root dir
*/
struct iscsi_boot_kset *iscsi_boot_create_kset(const char *set_name)
{
struct iscsi_boot_kset *boot_kset;
boot_kset = kzalloc(sizeof(*boot_kset), GFP_KERNEL);
if (!boot_kset)
return NULL;
boot_kset->kset = kset_create_and_add(set_name, NULL, firmware_kobj);
if (!boot_kset->kset) {
kfree(boot_kset);
return NULL;
}
INIT_LIST_HEAD(&boot_kset->kobj_list);
return boot_kset;
}
EXPORT_SYMBOL_GPL(iscsi_boot_create_kset);
/**
* iscsi_boot_create_host_kset() - creates root sysfs tree for a scsi host
* @hostno: host number of scsi host
*/
struct iscsi_boot_kset *iscsi_boot_create_host_kset(unsigned int hostno)
{
struct iscsi_boot_kset *boot_kset;
char *set_name;
set_name = kasprintf(GFP_KERNEL, "iscsi_boot%u", hostno);
if (!set_name)
return NULL;
boot_kset = iscsi_boot_create_kset(set_name);
kfree(set_name);
return boot_kset;
}
EXPORT_SYMBOL_GPL(iscsi_boot_create_host_kset);
/**
* iscsi_boot_destroy_kset() - destroy kset and kobjects under it
* @boot_kset: boot kset
*
* This will remove the kset and kobjects and attrs under it.
*/
void iscsi_boot_destroy_kset(struct iscsi_boot_kset *boot_kset)
{
struct iscsi_boot_kobj *boot_kobj, *tmp_kobj;
list_for_each_entry_safe(boot_kobj, tmp_kobj,
&boot_kset->kobj_list, list)
iscsi_boot_remove_kobj(boot_kobj);
kset_unregister(boot_kset->kset);
}
EXPORT_SYMBOL_GPL(iscsi_boot_destroy_kset);
