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