Pileus Git - ~andy/linux/blob - drivers/scsi/scsi_transport_iscsi.c

   1 /*
   2  * iSCSI transport class definitions
   3  *
   4  * Copyright (C) IBM Corporation, 2004
   5  * Copyright (C) Mike Christie, 2004 - 2005
   6  * Copyright (C) Dmitry Yusupov, 2004 - 2005
   7  * Copyright (C) Alex Aizman, 2004 - 2005
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  22  */
  23 #include <linux/module.h>
  24 #include <linux/mutex.h>
  25 #include <linux/slab.h>
  26 #include <net/tcp.h>
  27 #include <scsi/scsi.h>
  28 #include <scsi/scsi_host.h>
  29 #include <scsi/scsi_device.h>
  30 #include <scsi/scsi_transport.h>
  31 #include <scsi/scsi_transport_iscsi.h>
  32 #include <scsi/iscsi_if.h>
  33 #include <scsi/scsi_cmnd.h>
  34
  35 #define ISCSI_TRANSPORT_VERSION "2.0-870"
  36
  37 static int dbg_session;
  38 module_param_named(debug_session, dbg_session, int,
  39                    S_IRUGO | S_IWUSR);
  40 MODULE_PARM_DESC(debug_session,
  41                  "Turn on debugging for sessions in scsi_transport_iscsi "
  42                  "module. Set to 1 to turn on, and zero to turn off. Default "
  43                  "is off.");
  44
  45 static int dbg_conn;
  46 module_param_named(debug_conn, dbg_conn, int,
  47                    S_IRUGO | S_IWUSR);
  48 MODULE_PARM_DESC(debug_conn,
  49                  "Turn on debugging for connections in scsi_transport_iscsi "
  50                  "module. Set to 1 to turn on, and zero to turn off. Default "
  51                  "is off.");
  52
  53 #define ISCSI_DBG_TRANS_SESSION(_session, dbg_fmt, arg...)              \
  54         do {                                                            \
  55                 if (dbg_session)                                        \
  56                         iscsi_cls_session_printk(KERN_INFO, _session,   \
  57                                                  "%s: " dbg_fmt,        \
  58                                                  __func__, ##arg);      \
  59         } while (0);
  60
  61 #define ISCSI_DBG_TRANS_CONN(_conn, dbg_fmt, arg...)                    \
  62         do {                                                            \
  63                 if (dbg_conn)                                           \
  64                         iscsi_cls_conn_printk(KERN_INFO, _conn,         \
  65                                               "%s: " dbg_fmt,           \
  66                                               __func__, ##arg); \
  67         } while (0);
  68
  69 struct iscsi_internal {
  70         struct scsi_transport_template t;
  71         struct iscsi_transport *iscsi_transport;
  72         struct list_head list;
  73         struct device dev;
  74
  75         struct transport_container conn_cont;
  76         struct transport_container session_cont;
  77 };
  78
  79 static atomic_t iscsi_session_nr; /* sysfs session id for next new session */
  80 static struct workqueue_struct *iscsi_eh_timer_workq;
  81
  82 /*
  83  * list of registered transports and lock that must
  84  * be held while accessing list. The iscsi_transport_lock must
  85  * be acquired after the rx_queue_mutex.
  86  */
  87 static LIST_HEAD(iscsi_transports);
  88 static DEFINE_SPINLOCK(iscsi_transport_lock);
  89
  90 #define to_iscsi_internal(tmpl) \
  91         container_of(tmpl, struct iscsi_internal, t)
  92
  93 #define dev_to_iscsi_internal(_dev) \
  94         container_of(_dev, struct iscsi_internal, dev)
  95
  96 static void iscsi_transport_release(struct device *dev)
  97 {
  98         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
  99         kfree(priv);
 100 }
 101
 102 /*
 103  * iscsi_transport_class represents the iscsi_transports that are
 104  * registered.
 105  */
 106 static struct class iscsi_transport_class = {
 107         .name = "iscsi_transport",
 108         .dev_release = iscsi_transport_release,
 109 };
 110
 111 static ssize_t
 112 show_transport_handle(struct device *dev, struct device_attribute *attr,
 113                       char *buf)
 114 {
 115         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);
 116         return sprintf(buf, "%llu\n", (unsigned long long)iscsi_handle(priv->iscsi_transport));
 117 }
 118 static DEVICE_ATTR(handle, S_IRUGO, show_transport_handle, NULL);
 119
 120 #define show_transport_attr(name, format)                               \
 121 static ssize_t                                                          \
 122 show_transport_##name(struct device *dev,                               \
 123                       struct device_attribute *attr,char *buf)          \
 124 {                                                                       \
 125         struct iscsi_internal *priv = dev_to_iscsi_internal(dev);       \
 126         return sprintf(buf, format"\n", priv->iscsi_transport->name);   \
 127 }                                                                       \
 128 static DEVICE_ATTR(name, S_IRUGO, show_transport_##name, NULL);
 129
 130 show_transport_attr(caps, "0x%x");
 131
 132 static struct attribute *iscsi_transport_attrs[] = {
 133         &dev_attr_handle.attr,
 134         &dev_attr_caps.attr,
 135         NULL,
 136 };
 137
 138 static struct attribute_group iscsi_transport_group = {
 139         .attrs = iscsi_transport_attrs,
 140 };
 141
 142 /*
 143  * iSCSI endpoint attrs
 144  */
 145 #define iscsi_dev_to_endpoint(_dev) \
 146         container_of(_dev, struct iscsi_endpoint, dev)
 147
 148 #define ISCSI_ATTR(_prefix,_name,_mode,_show,_store)    \
 149 struct device_attribute dev_attr_##_prefix##_##_name =  \
 150         __ATTR(_name,_mode,_show,_store)
 151
 152 static void iscsi_endpoint_release(struct device *dev)
 153 {
 154         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 155         kfree(ep);
 156 }
 157
 158 static struct class iscsi_endpoint_class = {
 159         .name = "iscsi_endpoint",
 160         .dev_release = iscsi_endpoint_release,
 161 };
 162
 163 static ssize_t
 164 show_ep_handle(struct device *dev, struct device_attribute *attr, char *buf)
 165 {
 166         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 167         return sprintf(buf, "%llu\n", (unsigned long long) ep->id);
 168 }
 169 static ISCSI_ATTR(ep, handle, S_IRUGO, show_ep_handle, NULL);
 170
 171 static struct attribute *iscsi_endpoint_attrs[] = {
 172         &dev_attr_ep_handle.attr,
 173         NULL,
 174 };
 175
 176 static struct attribute_group iscsi_endpoint_group = {
 177         .attrs = iscsi_endpoint_attrs,
 178 };
 179
 180 #define ISCSI_MAX_EPID -1
 181
 182 static int iscsi_match_epid(struct device *dev, void *data)
 183 {
 184         struct iscsi_endpoint *ep = iscsi_dev_to_endpoint(dev);
 185         uint64_t *epid = (uint64_t *) data;
 186
 187         return *epid == ep->id;
 188 }
 189
 190 struct iscsi_endpoint *
 191 iscsi_create_endpoint(int dd_size)
 192 {
 193         struct device *dev;
 194         struct iscsi_endpoint *ep;
 195         uint64_t id;
 196         int err;
 197
 198         for (id = 1; id < ISCSI_MAX_EPID; id++) {
 199                 dev = class_find_device(&iscsi_endpoint_class, NULL, &id,
 200                                         iscsi_match_epid);
 201                 if (!dev)
 202                         break;
 203         }
 204         if (id == ISCSI_MAX_EPID) {
 205                 printk(KERN_ERR "Too many connections. Max supported %u\n",
 206                        ISCSI_MAX_EPID - 1);
 207                 return NULL;
 208         }
 209
 210         ep = kzalloc(sizeof(*ep) + dd_size, GFP_KERNEL);
 211         if (!ep)
 212                 return NULL;
 213
 214         ep->id = id;
 215         ep->dev.class = &iscsi_endpoint_class;
 216         dev_set_name(&ep->dev, "ep-%llu", (unsigned long long) id);
 217         err = device_register(&ep->dev);
 218         if (err)
 219                 goto free_ep;
 220
 221         err = sysfs_create_group(&ep->dev.kobj, &iscsi_endpoint_group);
 222         if (err)
 223                 goto unregister_dev;
 224
 225         if (dd_size)
 226                 ep->dd_data = &ep[1];
 227         return ep;
 228
 229 unregister_dev:
 230         device_unregister(&ep->dev);
 231         return NULL;
 232
 233 free_ep:
 234         kfree(ep);
 235         return NULL;
 236 }
 237 EXPORT_SYMBOL_GPL(iscsi_create_endpoint);
 238
 239 void iscsi_destroy_endpoint(struct iscsi_endpoint *ep)
 240 {
 241         sysfs_remove_group(&ep->dev.kobj, &iscsi_endpoint_group);
 242         device_unregister(&ep->dev);
 243 }
 244 EXPORT_SYMBOL_GPL(iscsi_destroy_endpoint);
 245
 246 struct iscsi_endpoint *iscsi_lookup_endpoint(u64 handle)
 247 {
 248         struct iscsi_endpoint *ep;
 249         struct device *dev;
 250
 251         dev = class_find_device(&iscsi_endpoint_class, NULL, &handle,
 252                                 iscsi_match_epid);
 253         if (!dev)
 254                 return NULL;
 255
 256         ep = iscsi_dev_to_endpoint(dev);
 257         /*
 258          * we can drop this now because the interface will prevent
 259          * removals and lookups from racing.
 260          */
 261         put_device(dev);
 262         return ep;
 263 }
 264 EXPORT_SYMBOL_GPL(iscsi_lookup_endpoint);
 265
 266 /*
 267  * Interface to display network param to sysfs
 268  */
 269
 270 static void iscsi_iface_release(struct device *dev)
 271 {
 272         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
 273         struct device *parent = iface->dev.parent;
 274
 275         kfree(iface);
 276         put_device(parent);
 277 }
 278
 279
 280 static struct class iscsi_iface_class = {
 281         .name = "iscsi_iface",
 282         .dev_release = iscsi_iface_release,
 283 };
 284
 285 #define ISCSI_IFACE_ATTR(_prefix, _name, _mode, _show, _store)  \
 286 struct device_attribute dev_attr_##_prefix##_##_name =          \
 287         __ATTR(_name, _mode, _show, _store)
 288
 289 /* iface attrs show */
 290 #define iscsi_iface_attr_show(type, name, param_type, param)            \
 291 static ssize_t                                                          \
 292 show_##type##_##name(struct device *dev, struct device_attribute *attr, \
 293                      char *buf)                                         \
 294 {                                                                       \
 295         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);            \
 296         struct iscsi_transport *t = iface->transport;                   \
 297         return t->get_iface_param(iface, param_type, param, buf);       \
 298 }                                                                       \
 299
 300 #define iscsi_iface_net_attr(type, name, param)                         \
 301         iscsi_iface_attr_show(type, name, ISCSI_NET_PARAM, param)       \
 302 static ISCSI_IFACE_ATTR(type, name, S_IRUGO, show_##type##_##name, NULL);
 303
 304 /* generic read only ipvi4 attribute */
 305 iscsi_iface_net_attr(ipv4_iface, ipaddress, ISCSI_NET_PARAM_IPV4_ADDR);
 306 iscsi_iface_net_attr(ipv4_iface, gateway, ISCSI_NET_PARAM_IPV4_GW);
 307 iscsi_iface_net_attr(ipv4_iface, subnet, ISCSI_NET_PARAM_IPV4_SUBNET);
 308 iscsi_iface_net_attr(ipv4_iface, bootproto, ISCSI_NET_PARAM_IPV4_BOOTPROTO);
 309
 310 /* generic read only ipv6 attribute */
 311 iscsi_iface_net_attr(ipv6_iface, ipaddress, ISCSI_NET_PARAM_IPV6_ADDR);
 312 iscsi_iface_net_attr(ipv6_iface, link_local_addr, ISCSI_NET_PARAM_IPV6_LINKLOCAL);
 313 iscsi_iface_net_attr(ipv6_iface, router_addr, ISCSI_NET_PARAM_IPV6_ROUTER);
 314 iscsi_iface_net_attr(ipv6_iface, ipaddr_autocfg,
 315                      ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG);
 316 iscsi_iface_net_attr(ipv6_iface, linklocal_autocfg,
 317                      ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG);
 318
 319 /* common read only iface attribute */
 320 iscsi_iface_net_attr(iface, enabled, ISCSI_NET_PARAM_IFACE_ENABLE);
 321 iscsi_iface_net_attr(iface, vlan, ISCSI_NET_PARAM_VLAN_ID);
 322
 323 static mode_t iscsi_iface_attr_is_visible(struct kobject *kobj,
 324                                           struct attribute *attr, int i)
 325 {
 326         struct device *dev = container_of(kobj, struct device, kobj);
 327         struct iscsi_iface *iface = iscsi_dev_to_iface(dev);
 328         struct iscsi_transport *t = iface->transport;
 329         int param;
 330
 331         if (attr == &dev_attr_iface_enabled.attr)
 332                 param = ISCSI_NET_PARAM_IFACE_ENABLE;
 333         else if (attr == &dev_attr_iface_vlan.attr)
 334                 param = ISCSI_NET_PARAM_VLAN_ID;
 335         else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV4) {
 336                 if (attr == &dev_attr_ipv4_iface_ipaddress.attr)
 337                         param = ISCSI_NET_PARAM_IPV4_ADDR;
 338                 else if (attr == &dev_attr_ipv4_iface_gateway.attr)
 339                         param = ISCSI_NET_PARAM_IPV4_GW;
 340                 else if (attr == &dev_attr_ipv4_iface_subnet.attr)
 341                         param = ISCSI_NET_PARAM_IPV4_SUBNET;
 342                 else if (attr == &dev_attr_ipv4_iface_bootproto.attr)
 343                         param = ISCSI_NET_PARAM_IPV4_BOOTPROTO;
 344                 else
 345                         return 0;
 346         } else if (iface->iface_type == ISCSI_IFACE_TYPE_IPV6) {
 347                 if (attr == &dev_attr_ipv6_iface_ipaddress.attr)
 348                         param = ISCSI_NET_PARAM_IPV6_ADDR;
 349                 else if (attr == &dev_attr_ipv6_iface_link_local_addr.attr)
 350                         param = ISCSI_NET_PARAM_IPV6_LINKLOCAL;
 351                 else if (attr == &dev_attr_ipv6_iface_router_addr.attr)
 352                         param = ISCSI_NET_PARAM_IPV6_ROUTER;
 353                 else if (attr == &dev_attr_ipv6_iface_ipaddr_autocfg.attr)
 354                         param = ISCSI_NET_PARAM_IPV6_ADDR_AUTOCFG;
 355                 else if (attr == &dev_attr_ipv6_iface_linklocal_autocfg.attr)
 356                         param = ISCSI_NET_PARAM_IPV6_LINKLOCAL_AUTOCFG;
 357                 else
 358                         return 0;
 359         } else {
 360                 WARN_ONCE(1, "Invalid iface attr");
 361                 return 0;
 362         }
 363
 364         return t->attr_is_visible(ISCSI_NET_PARAM, param);
 365 }
 366
 367 static struct attribute *iscsi_iface_attrs[] = {
 368         &dev_attr_iface_enabled.attr,
 369         &dev_attr_iface_vlan.attr,
 370         &dev_attr_ipv4_iface_ipaddress.attr,
 371         &dev_attr_ipv4_iface_gateway.attr,
 372         &dev_attr_ipv4_iface_subnet.attr,
 373         &dev_attr_ipv4_iface_bootproto.attr,
 374         &dev_attr_ipv6_iface_ipaddress.attr,
 375         &dev_attr_ipv6_iface_link_local_addr.attr,
 376         &dev_attr_ipv6_iface_router_addr.attr,
 377         &dev_attr_ipv6_iface_ipaddr_autocfg.attr,
 378         &dev_attr_ipv6_iface_linklocal_autocfg.attr,
 379         NULL,
 380 };
 381
 382 static struct attribute_group iscsi_iface_group = {
 383         .attrs = iscsi_iface_attrs,
 384         .is_visible = iscsi_iface_attr_is_visible,
 385 };
 386
 387 struct iscsi_iface *
 388 iscsi_create_iface(struct Scsi_Host *shost, struct iscsi_transport *transport,
 389                    uint32_t iface_type, uint32_t iface_num, int dd_size)
 390 {
 391         struct iscsi_iface *iface;
 392         int err;
 393
 394         iface = kzalloc(sizeof(*iface) + dd_size, GFP_KERNEL);
 395         if (!iface)
 396                 return NULL;
 397
 398         iface->transport = transport;
 399         iface->iface_type = iface_type;
 400         iface->iface_num = iface_num;
 401         iface->dev.release = iscsi_iface_release;
 402         iface->dev.class = &iscsi_iface_class;
 403         /* parent reference released in iscsi_iface_release */
 404         iface->dev.parent = get_device(&shost->shost_gendev);
 405         if (iface_type == ISCSI_IFACE_TYPE_IPV4)
 406                 dev_set_name(&iface->dev, "ipv4-iface-%u-%u", shost->host_no,
 407                              iface_num);
 408         else
 409                 dev_set_name(&iface->dev, "ipv6-iface-%u-%u", shost->host_no,
 410                              iface_num);
 411
 412         err = device_register(&iface->dev);
 413         if (err)
 414                 goto free_iface;
 415
 416         err = sysfs_create_group(&iface->dev.kobj, &iscsi_iface_group);
 417         if (err)
 418                 goto unreg_iface;
 419
 420         if (dd_size)
 421                 iface->dd_data = &iface[1];
 422         return iface;
 423
 424 unreg_iface:
 425         device_unregister(&iface->dev);
 426         return NULL;
 427
 428 free_iface:
 429         put_device(iface->dev.parent);
 430         kfree(iface);
 431         return NULL;
 432 }
 433 EXPORT_SYMBOL_GPL(iscsi_create_iface);
 434
 435 void iscsi_destroy_iface(struct iscsi_iface *iface)
 436 {
 437         sysfs_remove_group(&iface->dev.kobj, &iscsi_iface_group);
 438         device_unregister(&iface->dev);
 439 }
 440 EXPORT_SYMBOL_GPL(iscsi_destroy_iface);
 441
 442 static int iscsi_setup_host(struct transport_container *tc, struct device *dev,
 443                             struct device *cdev)
 444 {
 445         struct Scsi_Host *shost = dev_to_shost(dev);
 446         struct iscsi_cls_host *ihost = shost->shost_data;
 447
 448         memset(ihost, 0, sizeof(*ihost));
 449         atomic_set(&ihost->nr_scans, 0);
 450         mutex_init(&ihost->mutex);
 451         return 0;
 452 }
 453
 454 static DECLARE_TRANSPORT_CLASS(iscsi_host_class,
 455                                "iscsi_host",
 456                                iscsi_setup_host,
 457                                NULL,
 458                                NULL);
 459
 460 static DECLARE_TRANSPORT_CLASS(iscsi_session_class,
 461                                "iscsi_session",
 462                                NULL,
 463                                NULL,
 464                                NULL);
 465
 466 static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
 467                                "iscsi_connection",
 468                                NULL,
 469                                NULL,
 470                                NULL);
 471
 472 static struct sock *nls;
 473 static DEFINE_MUTEX(rx_queue_mutex);
 474
 475 static LIST_HEAD(sesslist);
 476 static DEFINE_SPINLOCK(sesslock);
 477 static LIST_HEAD(connlist);
 478 static DEFINE_SPINLOCK(connlock);
 479
 480 static uint32_t iscsi_conn_get_sid(struct iscsi_cls_conn *conn)
 481 {
 482         struct iscsi_cls_session *sess = iscsi_dev_to_session(conn->dev.parent);
 483         return sess->sid;
 484 }
 485
 486 /*
 487  * Returns the matching session to a given sid
 488  */
 489 static struct iscsi_cls_session *iscsi_session_lookup(uint32_t sid)
 490 {
 491         unsigned long flags;
 492         struct iscsi_cls_session *sess;
 493
 494         spin_lock_irqsave(&sesslock, flags);
 495         list_for_each_entry(sess, &sesslist, sess_list) {
 496                 if (sess->sid == sid) {
 497                         spin_unlock_irqrestore(&sesslock, flags);
 498                         return sess;
 499                 }
 500         }
 501         spin_unlock_irqrestore(&sesslock, flags);
 502         return NULL;
 503 }
 504
 505 /*
 506  * Returns the matching connection to a given sid / cid tuple
 507  */
 508 static struct iscsi_cls_conn *iscsi_conn_lookup(uint32_t sid, uint32_t cid)
 509 {
 510         unsigned long flags;
 511         struct iscsi_cls_conn *conn;
 512
 513         spin_lock_irqsave(&connlock, flags);
 514         list_for_each_entry(conn, &connlist, conn_list) {
 515                 if ((conn->cid == cid) && (iscsi_conn_get_sid(conn) == sid)) {
 516                         spin_unlock_irqrestore(&connlock, flags);
 517                         return conn;
 518                 }
 519         }
 520         spin_unlock_irqrestore(&connlock, flags);
 521         return NULL;
 522 }
 523
 524 /*
 525  * The following functions can be used by LLDs that allocate
 526  * their own scsi_hosts or by software iscsi LLDs
 527  */
 528 static struct {
 529         int value;
 530         char *name;
 531 } iscsi_session_state_names[] = {
 532         { ISCSI_SESSION_LOGGED_IN,      "LOGGED_IN" },
 533         { ISCSI_SESSION_FAILED,         "FAILED" },
 534         { ISCSI_SESSION_FREE,           "FREE" },
 535 };
 536
 537 static const char *iscsi_session_state_name(int state)
 538 {
 539         int i;
 540         char *name = NULL;
 541
 542         for (i = 0; i < ARRAY_SIZE(iscsi_session_state_names); i++) {
 543                 if (iscsi_session_state_names[i].value == state) {
 544                         name = iscsi_session_state_names[i].name;
 545                         break;
 546                 }
 547         }
 548         return name;
 549 }
 550
 551 int iscsi_session_chkready(struct iscsi_cls_session *session)
 552 {
 553         unsigned long flags;
 554         int err;
 555
 556         spin_lock_irqsave(&session->lock, flags);
 557         switch (session->state) {
 558         case ISCSI_SESSION_LOGGED_IN:
 559                 err = 0;
 560                 break;
 561         case ISCSI_SESSION_FAILED:
 562                 err = DID_IMM_RETRY << 16;
 563                 break;
 564         case ISCSI_SESSION_FREE:
 565                 err = DID_TRANSPORT_FAILFAST << 16;
 566                 break;
 567         default:
 568                 err = DID_NO_CONNECT << 16;
 569                 break;
 570         }
 571         spin_unlock_irqrestore(&session->lock, flags);
 572         return err;
 573 }
 574 EXPORT_SYMBOL_GPL(iscsi_session_chkready);
 575
 576 static void iscsi_session_release(struct device *dev)
 577 {
 578         struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
 579         struct Scsi_Host *shost;
 580
 581         shost = iscsi_session_to_shost(session);
 582         scsi_host_put(shost);
 583         ISCSI_DBG_TRANS_SESSION(session, "Completing session release\n");
 584         kfree(session);
 585 }
 586
 587 static int iscsi_is_session_dev(const struct device *dev)
 588 {
 589         return dev->release == iscsi_session_release;
 590 }
 591
 592 static int iscsi_iter_session_fn(struct device *dev, void *data)
 593 {
 594         void (* fn) (struct iscsi_cls_session *) = data;
 595
 596         if (!iscsi_is_session_dev(dev))
 597                 return 0;
 598         fn(iscsi_dev_to_session(dev));
 599         return 0;
 600 }
 601
 602 void iscsi_host_for_each_session(struct Scsi_Host *shost,
 603                                  void (*fn)(struct iscsi_cls_session *))
 604 {
 605         device_for_each_child(&shost->shost_gendev, fn,
 606                               iscsi_iter_session_fn);
 607 }
 608 EXPORT_SYMBOL_GPL(iscsi_host_for_each_session);
 609
 610 /**
 611  * iscsi_scan_finished - helper to report when running scans are done
 612  * @shost: scsi host
 613  * @time: scan run time
 614  *
 615  * This function can be used by drives like qla4xxx to report to the scsi
 616  * layer when the scans it kicked off at module load time are done.
 617  */
 618 int iscsi_scan_finished(struct Scsi_Host *shost, unsigned long time)
 619 {
 620         struct iscsi_cls_host *ihost = shost->shost_data;
 621         /*
 622          * qla4xxx will have kicked off some session unblocks before calling
 623          * scsi_scan_host, so just wait for them to complete.
 624          */
 625         return !atomic_read(&ihost->nr_scans);
 626 }
 627 EXPORT_SYMBOL_GPL(iscsi_scan_finished);
 628
 629 struct iscsi_scan_data {
 630         unsigned int channel;
 631         unsigned int id;
 632         unsigned int lun;
 633 };
 634
 635 static int iscsi_user_scan_session(struct device *dev, void *data)
 636 {
 637         struct iscsi_scan_data *scan_data = data;
 638         struct iscsi_cls_session *session;
 639         struct Scsi_Host *shost;
 640         struct iscsi_cls_host *ihost;
 641         unsigned long flags;
 642         unsigned int id;
 643
 644         if (!iscsi_is_session_dev(dev))
 645                 return 0;
 646
 647         session = iscsi_dev_to_session(dev);
 648
 649         ISCSI_DBG_TRANS_SESSION(session, "Scanning session\n");
 650
 651         shost = iscsi_session_to_shost(session);
 652         ihost = shost->shost_data;
 653
 654         mutex_lock(&ihost->mutex);
 655         spin_lock_irqsave(&session->lock, flags);
 656         if (session->state != ISCSI_SESSION_LOGGED_IN) {
 657                 spin_unlock_irqrestore(&session->lock, flags);
 658                 goto user_scan_exit;
 659         }
 660         id = session->target_id;
 661         spin_unlock_irqrestore(&session->lock, flags);
 662
 663         if (id != ISCSI_MAX_TARGET) {
 664                 if ((scan_data->channel == SCAN_WILD_CARD ||
 665                      scan_data->channel == 0) &&
 666                     (scan_data->id == SCAN_WILD_CARD ||
 667                      scan_data->id == id))
 668                         scsi_scan_target(&session->dev, 0, id,
 669                                          scan_data->lun, 1);
 670         }
 671
 672 user_scan_exit:
 673         mutex_unlock(&ihost->mutex);
 674         ISCSI_DBG_TRANS_SESSION(session, "Completed session scan\n");
 675         return 0;
 676 }
 677
 678 static int iscsi_user_scan(struct Scsi_Host *shost, uint channel,
 679                            uint id, uint lun)
 680 {
 681         struct iscsi_scan_data scan_data;
 682
 683         scan_data.channel = channel;
 684         scan_data.id = id;
 685         scan_data.lun = lun;
 686
 687         return device_for_each_child(&shost->shost_gendev, &scan_data,
 688                                      iscsi_user_scan_session);
 689 }
 690
 691 static void iscsi_scan_session(struct work_struct *work)
 692 {
 693         struct iscsi_cls_session *session =
 694                         container_of(work, struct iscsi_cls_session, scan_work);
 695         struct Scsi_Host *shost = iscsi_session_to_shost(session);
 696         struct iscsi_cls_host *ihost = shost->shost_data;
 697         struct iscsi_scan_data scan_data;
 698
 699         scan_data.channel = 0;
 700         scan_data.id = SCAN_WILD_CARD;
 701         scan_data.lun = SCAN_WILD_CARD;
 702
 703         iscsi_user_scan_session(&session->dev, &scan_data);
 704         atomic_dec(&ihost->nr_scans);
 705 }
 706
 707 /**
 708  * iscsi_block_scsi_eh - block scsi eh until session state has transistioned
 709  * @cmd: scsi cmd passed to scsi eh handler
 710  *
 711  * If the session is down this function will wait for the recovery
 712  * timer to fire or for the session to be logged back in. If the
 713  * recovery timer fires then FAST_IO_FAIL is returned. The caller
 714  * should pass this error value to the scsi eh.
 715  */
 716 int iscsi_block_scsi_eh(struct scsi_cmnd *cmd)
 717 {
 718         struct iscsi_cls_session *session =
 719                         starget_to_session(scsi_target(cmd->device));
 720         unsigned long flags;
 721         int ret = 0;
 722
 723         spin_lock_irqsave(&session->lock, flags);
 724         while (session->state != ISCSI_SESSION_LOGGED_IN) {
 725                 if (session->state == ISCSI_SESSION_FREE) {
 726                         ret = FAST_IO_FAIL;
 727                         break;
 728                 }
 729                 spin_unlock_irqrestore(&session->lock, flags);
 730                 msleep(1000);
 731                 spin_lock_irqsave(&session->lock, flags);
 732         }
 733         spin_unlock_irqrestore(&session->lock, flags);
 734         return ret;
 735 }
 736 EXPORT_SYMBOL_GPL(iscsi_block_scsi_eh);
 737
 738 static void session_recovery_timedout(struct work_struct *work)
 739 {
 740         struct iscsi_cls_session *session =
 741                 container_of(work, struct iscsi_cls_session,
 742                              recovery_work.work);
 743         unsigned long flags;
 744
 745         iscsi_cls_session_printk(KERN_INFO, session,
 746                                  "session recovery timed out after %d secs\n",
 747                                  session->recovery_tmo);
 748
 749         spin_lock_irqsave(&session->lock, flags);
 750         switch (session->state) {
 751         case ISCSI_SESSION_FAILED:
 752                 session->state = ISCSI_SESSION_FREE;
 753                 break;
 754         case ISCSI_SESSION_LOGGED_IN:
 755         case ISCSI_SESSION_FREE:
 756                 /* we raced with the unblock's flush */
 757                 spin_unlock_irqrestore(&session->lock, flags);
 758                 return;
 759         }
 760         spin_unlock_irqrestore(&session->lock, flags);
 761
 762         if (session->transport->session_recovery_timedout)
 763                 session->transport->session_recovery_timedout(session);
 764
 765         ISCSI_DBG_TRANS_SESSION(session, "Unblocking SCSI target\n");
 766         scsi_target_unblock(&session->dev);
 767         ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking SCSI target\n");
 768 }
 769
 770 static void __iscsi_unblock_session(struct work_struct *work)
 771 {
 772         struct iscsi_cls_session *session =
 773                         container_of(work, struct iscsi_cls_session,
 774                                      unblock_work);
 775         struct Scsi_Host *shost = iscsi_session_to_shost(session);
 776         struct iscsi_cls_host *ihost = shost->shost_data;
 777         unsigned long flags;
 778
 779         ISCSI_DBG_TRANS_SESSION(session, "Unblocking session\n");
 780         /*
 781          * The recovery and unblock work get run from the same workqueue,
 782          * so try to cancel it if it was going to run after this unblock.
 783          */
 784         cancel_delayed_work(&session->recovery_work);
 785         spin_lock_irqsave(&session->lock, flags);
 786         session->state = ISCSI_SESSION_LOGGED_IN;
 787         spin_unlock_irqrestore(&session->lock, flags);
 788         /* start IO */
 789         scsi_target_unblock(&session->dev);
 790         /*
 791          * Only do kernel scanning if the driver is properly hooked into
 792          * the async scanning code (drivers like iscsi_tcp do login and
 793          * scanning from userspace).
 794          */
 795         if (shost->hostt->scan_finished) {
 796                 if (scsi_queue_work(shost, &session->scan_work))
 797                         atomic_inc(&ihost->nr_scans);
 798         }
 799         ISCSI_DBG_TRANS_SESSION(session, "Completed unblocking session\n");
 800 }
 801
 802 /**
 803  * iscsi_unblock_session - set a session as logged in and start IO.
 804  * @session: iscsi session
 805  *
 806  * Mark a session as ready to accept IO.
 807  */
 808 void iscsi_unblock_session(struct iscsi_cls_session *session)
 809 {
 810         queue_work(iscsi_eh_timer_workq, &session->unblock_work);
 811         /*
 812          * make sure all the events have completed before tell the driver
 813          * it is safe
 814          */
 815         flush_workqueue(iscsi_eh_timer_workq);
 816 }
 817 EXPORT_SYMBOL_GPL(iscsi_unblock_session);
 818
 819 static void __iscsi_block_session(struct work_struct *work)
 820 {
 821         struct iscsi_cls_session *session =
 822                         container_of(work, struct iscsi_cls_session,
 823                                      block_work);
 824         unsigned long flags;
 825
 826         ISCSI_DBG_TRANS_SESSION(session, "Blocking session\n");
 827         spin_lock_irqsave(&session->lock, flags);
 828         session->state = ISCSI_SESSION_FAILED;
 829         spin_unlock_irqrestore(&session->lock, flags);
 830         scsi_target_block(&session->dev);
 831         ISCSI_DBG_TRANS_SESSION(session, "Completed SCSI target blocking\n");
 832         if (session->recovery_tmo >= 0)
 833                 queue_delayed_work(iscsi_eh_timer_workq,
 834                                    &session->recovery_work,
 835                                    session->recovery_tmo * HZ);
 836 }
 837
 838 void iscsi_block_session(struct iscsi_cls_session *session)
 839 {
 840         queue_work(iscsi_eh_timer_workq, &session->block_work);
 841 }
 842 EXPORT_SYMBOL_GPL(iscsi_block_session);
 843
 844 static void __iscsi_unbind_session(struct work_struct *work)
 845 {
 846         struct iscsi_cls_session *session =
 847                         container_of(work, struct iscsi_cls_session,
 848                                      unbind_work);
 849         struct Scsi_Host *shost = iscsi_session_to_shost(session);
 850         struct iscsi_cls_host *ihost = shost->shost_data;
 851         unsigned long flags;
 852
 853         ISCSI_DBG_TRANS_SESSION(session, "Unbinding session\n");
 854
 855         /* Prevent new scans and make sure scanning is not in progress */
 856         mutex_lock(&ihost->mutex);
 857         spin_lock_irqsave(&session->lock, flags);
 858         if (session->target_id == ISCSI_MAX_TARGET) {
 859                 spin_unlock_irqrestore(&session->lock, flags);
 860                 mutex_unlock(&ihost->mutex);
 861                 return;
 862         }
 863         session->target_id = ISCSI_MAX_TARGET;
 864         spin_unlock_irqrestore(&session->lock, flags);
 865         mutex_unlock(&ihost->mutex);
 866
 867         scsi_remove_target(&session->dev);
 868         iscsi_session_event(session, ISCSI_KEVENT_UNBIND_SESSION);
 869         ISCSI_DBG_TRANS_SESSION(session, "Completed target removal\n");
 870 }
 871
 872 struct iscsi_cls_session *
 873 iscsi_alloc_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
 874                     int dd_size)
 875 {
 876         struct iscsi_cls_session *session;
 877
 878         session = kzalloc(sizeof(*session) + dd_size,
 879                           GFP_KERNEL);
 880         if (!session)
 881                 return NULL;
 882
 883         session->transport = transport;
 884         session->recovery_tmo = 120;
 885         session->state = ISCSI_SESSION_FREE;
 886         INIT_DELAYED_WORK(&session->recovery_work, session_recovery_timedout);
 887         INIT_LIST_HEAD(&session->sess_list);
 888         INIT_WORK(&session->unblock_work, __iscsi_unblock_session);
 889         INIT_WORK(&session->block_work, __iscsi_block_session);
 890         INIT_WORK(&session->unbind_work, __iscsi_unbind_session);
 891         INIT_WORK(&session->scan_work, iscsi_scan_session);
 892         spin_lock_init(&session->lock);
 893
 894         /* this is released in the dev's release function */
 895         scsi_host_get(shost);
 896         session->dev.parent = &shost->shost_gendev;
 897         session->dev.release = iscsi_session_release;
 898         device_initialize(&session->dev);
 899         if (dd_size)
 900                 session->dd_data = &session[1];
 901
 902         ISCSI_DBG_TRANS_SESSION(session, "Completed session allocation\n");
 903         return session;
 904 }
 905 EXPORT_SYMBOL_GPL(iscsi_alloc_session);
 906
 907 static int iscsi_get_next_target_id(struct device *dev, void *data)
 908 {
 909         struct iscsi_cls_session *session;
 910         unsigned long flags;
 911         int err = 0;
 912
 913         if (!iscsi_is_session_dev(dev))
 914                 return 0;
 915
 916         session = iscsi_dev_to_session(dev);
 917         spin_lock_irqsave(&session->lock, flags);
 918         if (*((unsigned int *) data) == session->target_id)
 919                 err = -EEXIST;
 920         spin_unlock_irqrestore(&session->lock, flags);
 921         return err;
 922 }
 923
 924 int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
 925 {
 926         struct Scsi_Host *shost = iscsi_session_to_shost(session);
 927         struct iscsi_cls_host *ihost;
 928         unsigned long flags;
 929         unsigned int id = target_id;
 930         int err;
 931
 932         ihost = shost->shost_data;
 933         session->sid = atomic_add_return(1, &iscsi_session_nr);
 934
 935         if (id == ISCSI_MAX_TARGET) {
 936                 for (id = 0; id < ISCSI_MAX_TARGET; id++) {
 937                         err = device_for_each_child(&shost->shost_gendev, &id,
 938                                                     iscsi_get_next_target_id);
 939                         if (!err)
 940                                 break;
 941                 }
 942
 943                 if (id == ISCSI_MAX_TARGET) {
 944                         iscsi_cls_session_printk(KERN_ERR, session,
 945                                                  "Too many iscsi targets. Max "
 946                                                  "number of targets is %d.\n",
 947                                                  ISCSI_MAX_TARGET - 1);
 948                         err = -EOVERFLOW;
 949                         goto release_host;
 950                 }
 951         }
 952         session->target_id = id;
 953
 954         dev_set_name(&session->dev, "session%u", session->sid);
 955         err = device_add(&session->dev);
 956         if (err) {
 957                 iscsi_cls_session_printk(KERN_ERR, session,
 958                                          "could not register session's dev\n");
 959                 goto release_host;
 960         }
 961         transport_register_device(&session->dev);
 962
 963         spin_lock_irqsave(&sesslock, flags);
 964         list_add(&session->sess_list, &sesslist);
 965         spin_unlock_irqrestore(&sesslock, flags);
 966
 967         iscsi_session_event(session, ISCSI_KEVENT_CREATE_SESSION);
 968         ISCSI_DBG_TRANS_SESSION(session, "Completed session adding\n");
 969         return 0;
 970
 971 release_host:
 972         scsi_host_put(shost);
 973         return err;
 974 }
 975 EXPORT_SYMBOL_GPL(iscsi_add_session);
 976
 977 /**
 978  * iscsi_create_session - create iscsi class session
 979  * @shost: scsi host
 980  * @transport: iscsi transport
 981  * @dd_size: private driver data size
 982  * @target_id: which target
 983  *
 984  * This can be called from a LLD or iscsi_transport.
 985  */
 986 struct iscsi_cls_session *
 987 iscsi_create_session(struct Scsi_Host *shost, struct iscsi_transport *transport,
 988                      int dd_size, unsigned int target_id)
 989 {
 990         struct iscsi_cls_session *session;
 991
 992         session = iscsi_alloc_session(shost, transport, dd_size);
 993         if (!session)
 994                 return NULL;
 995
 996         if (iscsi_add_session(session, target_id)) {
 997                 iscsi_free_session(session);
 998                 return NULL;
 999         }
1000         return session;
1001 }
1002 EXPORT_SYMBOL_GPL(iscsi_create_session);
1003
1004 static void iscsi_conn_release(struct device *dev)
1005 {
1006         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev);
1007         struct device *parent = conn->dev.parent;
1008
1009         ISCSI_DBG_TRANS_CONN(conn, "Releasing conn\n");
1010         kfree(conn);
1011         put_device(parent);
1012 }
1013
1014 static int iscsi_is_conn_dev(const struct device *dev)
1015 {
1016         return dev->release == iscsi_conn_release;
1017 }
1018
1019 static int iscsi_iter_destroy_conn_fn(struct device *dev, void *data)
1020 {
1021         if (!iscsi_is_conn_dev(dev))
1022                 return 0;
1023         return iscsi_destroy_conn(iscsi_dev_to_conn(dev));
1024 }
1025
1026 void iscsi_remove_session(struct iscsi_cls_session *session)
1027 {
1028         struct Scsi_Host *shost = iscsi_session_to_shost(session);
1029         unsigned long flags;
1030         int err;
1031
1032         ISCSI_DBG_TRANS_SESSION(session, "Removing session\n");
1033
1034         spin_lock_irqsave(&sesslock, flags);
1035         list_del(&session->sess_list);
1036         spin_unlock_irqrestore(&sesslock, flags);
1037
1038         /* make sure there are no blocks/unblocks queued */
1039         flush_workqueue(iscsi_eh_timer_workq);
1040         /* make sure the timedout callout is not running */
1041         if (!cancel_delayed_work(&session->recovery_work))
1042                 flush_workqueue(iscsi_eh_timer_workq);
1043         /*
1044          * If we are blocked let commands flow again. The lld or iscsi
1045          * layer should set up the queuecommand to fail commands.
1046          * We assume that LLD will not be calling block/unblock while
1047          * removing the session.
1048          */
1049         spin_lock_irqsave(&session->lock, flags);
1050         session->state = ISCSI_SESSION_FREE;
1051         spin_unlock_irqrestore(&session->lock, flags);
1052
1053         scsi_target_unblock(&session->dev);
1054         /* flush running scans then delete devices */
1055         scsi_flush_work(shost);
1056         __iscsi_unbind_session(&session->unbind_work);
1057
1058         /* hw iscsi may not have removed all connections from session */
1059         err = device_for_each_child(&session->dev, NULL,
1060                                     iscsi_iter_destroy_conn_fn);
1061         if (err)
1062                 iscsi_cls_session_printk(KERN_ERR, session,
1063                                          "Could not delete all connections "
1064                                          "for session. Error %d.\n", err);
1065
1066         transport_unregister_device(&session->dev);
1067
1068         ISCSI_DBG_TRANS_SESSION(session, "Completing session removal\n");
1069         device_del(&session->dev);
1070 }
1071 EXPORT_SYMBOL_GPL(iscsi_remove_session);
1072
1073 void iscsi_free_session(struct iscsi_cls_session *session)
1074 {
1075         ISCSI_DBG_TRANS_SESSION(session, "Freeing session\n");
1076         iscsi_session_event(session, ISCSI_KEVENT_DESTROY_SESSION);
1077         put_device(&session->dev);
1078 }
1079 EXPORT_SYMBOL_GPL(iscsi_free_session);
1080
1081 /**
1082  * iscsi_destroy_session - destroy iscsi session
1083  * @session: iscsi_session
1084  *
1085  * Can be called by a LLD or iscsi_transport. There must not be
1086  * any running connections.
1087  */
1088 int iscsi_destroy_session(struct iscsi_cls_session *session)
1089 {
1090         iscsi_remove_session(session);
1091         ISCSI_DBG_TRANS_SESSION(session, "Completing session destruction\n");
1092         iscsi_free_session(session);
1093         return 0;
1094 }
1095 EXPORT_SYMBOL_GPL(iscsi_destroy_session);
1096
1097 /**
1098  * iscsi_create_conn - create iscsi class connection
1099  * @session: iscsi cls session
1100  * @dd_size: private driver data size
1101  * @cid: connection id
1102  *
1103  * This can be called from a LLD or iscsi_transport. The connection
1104  * is child of the session so cid must be unique for all connections
1105  * on the session.
1106  *
1107  * Since we do not support MCS, cid will normally be zero. In some cases
1108  * for software iscsi we could be trying to preallocate a connection struct
1109  * in which case there could be two connection structs and cid would be
1110  * non-zero.
1111  */
1112 struct iscsi_cls_conn *
1113 iscsi_create_conn(struct iscsi_cls_session *session, int dd_size, uint32_t cid)
1114 {
1115         struct iscsi_transport *transport = session->transport;
1116         struct iscsi_cls_conn *conn;
1117         unsigned long flags;
1118         int err;
1119
1120         conn = kzalloc(sizeof(*conn) + dd_size, GFP_KERNEL);
1121         if (!conn)
1122                 return NULL;
1123         if (dd_size)
1124                 conn->dd_data = &conn[1];
1125
1126         mutex_init(&conn->ep_mutex);
1127         INIT_LIST_HEAD(&conn->conn_list);
1128         conn->transport = transport;
1129         conn->cid = cid;
1130
1131         /* this is released in the dev's release function */
1132         if (!get_device(&session->dev))
1133                 goto free_conn;
1134
1135         dev_set_name(&conn->dev, "connection%d:%u", session->sid, cid);
1136         conn->dev.parent = &session->dev;
1137         conn->dev.release = iscsi_conn_release;
1138         err = device_register(&conn->dev);
1139         if (err) {
1140                 iscsi_cls_session_printk(KERN_ERR, session, "could not "
1141                                          "register connection's dev\n");
1142                 goto release_parent_ref;
1143         }
1144         transport_register_device(&conn->dev);
1145
1146         spin_lock_irqsave(&connlock, flags);
1147         list_add(&conn->conn_list, &connlist);
1148         spin_unlock_irqrestore(&connlock, flags);
1149
1150         ISCSI_DBG_TRANS_CONN(conn, "Completed conn creation\n");
1151         return conn;
1152
1153 release_parent_ref:
1154         put_device(&session->dev);
1155 free_conn:
1156         kfree(conn);
1157         return NULL;
1158 }
1159
1160 EXPORT_SYMBOL_GPL(iscsi_create_conn);
1161
1162 /**
1163  * iscsi_destroy_conn - destroy iscsi class connection
1164  * @conn: iscsi cls session
1165  *
1166  * This can be called from a LLD or iscsi_transport.
1167  */
1168 int iscsi_destroy_conn(struct iscsi_cls_conn *conn)
1169 {
1170         unsigned long flags;
1171
1172         spin_lock_irqsave(&connlock, flags);
1173         list_del(&conn->conn_list);
1174         spin_unlock_irqrestore(&connlock, flags);
1175
1176         transport_unregister_device(&conn->dev);
1177         ISCSI_DBG_TRANS_CONN(conn, "Completing conn destruction\n");
1178         device_unregister(&conn->dev);
1179         return 0;
1180 }
1181 EXPORT_SYMBOL_GPL(iscsi_destroy_conn);
1182
1183 /*
1184  * iscsi interface functions
1185  */
1186 static struct iscsi_internal *
1187 iscsi_if_transport_lookup(struct iscsi_transport *tt)
1188 {
1189         struct iscsi_internal *priv;
1190         unsigned long flags;
1191
1192         spin_lock_irqsave(&iscsi_transport_lock, flags);
1193         list_for_each_entry(priv, &iscsi_transports, list) {
1194                 if (tt == priv->iscsi_transport) {
1195                         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1196                         return priv;
1197                 }
1198         }
1199         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
1200         return NULL;
1201 }
1202
1203 static int
1204 iscsi_multicast_skb(struct sk_buff *skb, uint32_t group, gfp_t gfp)
1205 {
1206         return nlmsg_multicast(nls, skb, 0, group, gfp);
1207 }
1208
1209 int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
1210                    char *data, uint32_t data_size)
1211 {
1212         struct nlmsghdr *nlh;
1213         struct sk_buff *skb;
1214         struct iscsi_uevent *ev;
1215         char *pdu;
1216         struct iscsi_internal *priv;
1217         int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) +
1218                               data_size);
1219
1220         priv = iscsi_if_transport_lookup(conn->transport);
1221         if (!priv)
1222                 return -EINVAL;
1223
1224         skb = alloc_skb(len, GFP_ATOMIC);
1225         if (!skb) {
1226                 iscsi_conn_error_event(conn, ISCSI_ERR_CONN_FAILED);
1227                 iscsi_cls_conn_printk(KERN_ERR, conn, "can not deliver "
1228                                       "control PDU: OOM\n");
1229                 return -ENOMEM;
1230         }
1231
1232         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1233         ev = NLMSG_DATA(nlh);
1234         memset(ev, 0, sizeof(*ev));
1235         ev->transport_handle = iscsi_handle(conn->transport);
1236         ev->type = ISCSI_KEVENT_RECV_PDU;
1237         ev->r.recv_req.cid = conn->cid;
1238         ev->r.recv_req.sid = iscsi_conn_get_sid(conn);
1239         pdu = (char*)ev + sizeof(*ev);
1240         memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
1241         memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
1242
1243         return iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
1244 }
1245 EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
1246
1247 int iscsi_offload_mesg(struct Scsi_Host *shost,
1248                        struct iscsi_transport *transport, uint32_t type,
1249                        char *data, uint16_t data_size)
1250 {
1251         struct nlmsghdr *nlh;
1252         struct sk_buff *skb;
1253         struct iscsi_uevent *ev;
1254         int len = NLMSG_SPACE(sizeof(*ev) + data_size);
1255
1256         skb = alloc_skb(len, GFP_ATOMIC);
1257         if (!skb) {
1258                 printk(KERN_ERR "can not deliver iscsi offload message:OOM\n");
1259                 return -ENOMEM;
1260         }
1261
1262         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1263         ev = NLMSG_DATA(nlh);
1264         memset(ev, 0, sizeof(*ev));
1265         ev->type = type;
1266         ev->transport_handle = iscsi_handle(transport);
1267         switch (type) {
1268         case ISCSI_KEVENT_PATH_REQ:
1269                 ev->r.req_path.host_no = shost->host_no;
1270                 break;
1271         case ISCSI_KEVENT_IF_DOWN:
1272                 ev->r.notify_if_down.host_no = shost->host_no;
1273                 break;
1274         }
1275
1276         memcpy((char *)ev + sizeof(*ev), data, data_size);
1277
1278         return iscsi_multicast_skb(skb, ISCSI_NL_GRP_UIP, GFP_ATOMIC);
1279 }
1280 EXPORT_SYMBOL_GPL(iscsi_offload_mesg);
1281
1282 void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
1283 {
1284         struct nlmsghdr *nlh;
1285         struct sk_buff  *skb;
1286         struct iscsi_uevent *ev;
1287         struct iscsi_internal *priv;
1288         int len = NLMSG_SPACE(sizeof(*ev));
1289
1290         priv = iscsi_if_transport_lookup(conn->transport);
1291         if (!priv)
1292                 return;
1293
1294         skb = alloc_skb(len, GFP_ATOMIC);
1295         if (!skb) {
1296                 iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
1297                                       "conn error (%d)\n", error);
1298                 return;
1299         }
1300
1301         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1302         ev = NLMSG_DATA(nlh);
1303         ev->transport_handle = iscsi_handle(conn->transport);
1304         ev->type = ISCSI_KEVENT_CONN_ERROR;
1305         ev->r.connerror.error = error;
1306         ev->r.connerror.cid = conn->cid;
1307         ev->r.connerror.sid = iscsi_conn_get_sid(conn);
1308
1309         iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
1310
1311         iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn error (%d)\n",
1312                               error);
1313 }
1314 EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
1315
1316 static int
1317 iscsi_if_send_reply(uint32_t group, int seq, int type, int done, int multi,
1318                     void *payload, int size)
1319 {
1320         struct sk_buff  *skb;
1321         struct nlmsghdr *nlh;
1322         int len = NLMSG_SPACE(size);
1323         int flags = multi ? NLM_F_MULTI : 0;
1324         int t = done ? NLMSG_DONE : type;
1325
1326         skb = alloc_skb(len, GFP_ATOMIC);
1327         if (!skb) {
1328                 printk(KERN_ERR "Could not allocate skb to send reply.\n");
1329                 return -ENOMEM;
1330         }
1331
1332         nlh = __nlmsg_put(skb, 0, 0, t, (len - sizeof(*nlh)), 0);
1333         nlh->nlmsg_flags = flags;
1334         memcpy(NLMSG_DATA(nlh), payload, size);
1335         return iscsi_multicast_skb(skb, group, GFP_ATOMIC);
1336 }
1337
1338 static int
1339 iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
1340 {
1341         struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1342         struct iscsi_stats *stats;
1343         struct sk_buff *skbstat;
1344         struct iscsi_cls_conn *conn;
1345         struct nlmsghdr *nlhstat;
1346         struct iscsi_uevent *evstat;
1347         struct iscsi_internal *priv;
1348         int len = NLMSG_SPACE(sizeof(*ev) +
1349                               sizeof(struct iscsi_stats) +
1350                               sizeof(struct iscsi_stats_custom) *
1351                               ISCSI_STATS_CUSTOM_MAX);
1352         int err = 0;
1353
1354         priv = iscsi_if_transport_lookup(transport);
1355         if (!priv)
1356                 return -EINVAL;
1357
1358         conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
1359         if (!conn)
1360                 return -EEXIST;
1361
1362         do {
1363                 int actual_size;
1364
1365                 skbstat = alloc_skb(len, GFP_ATOMIC);
1366                 if (!skbstat) {
1367                         iscsi_cls_conn_printk(KERN_ERR, conn, "can not "
1368                                               "deliver stats: OOM\n");
1369                         return -ENOMEM;
1370                 }
1371
1372                 nlhstat = __nlmsg_put(skbstat, 0, 0, 0,
1373                                       (len - sizeof(*nlhstat)), 0);
1374                 evstat = NLMSG_DATA(nlhstat);
1375                 memset(evstat, 0, sizeof(*evstat));
1376                 evstat->transport_handle = iscsi_handle(conn->transport);
1377                 evstat->type = nlh->nlmsg_type;
1378                 evstat->u.get_stats.cid =
1379                         ev->u.get_stats.cid;
1380                 evstat->u.get_stats.sid =
1381                         ev->u.get_stats.sid;
1382                 stats = (struct iscsi_stats *)
1383                         ((char*)evstat + sizeof(*evstat));
1384                 memset(stats, 0, sizeof(*stats));
1385
1386                 transport->get_stats(conn, stats);
1387                 actual_size = NLMSG_SPACE(sizeof(struct iscsi_uevent) +
1388                                           sizeof(struct iscsi_stats) +
1389                                           sizeof(struct iscsi_stats_custom) *
1390                                           stats->custom_length);
1391                 actual_size -= sizeof(*nlhstat);
1392                 actual_size = NLMSG_LENGTH(actual_size);
1393                 skb_trim(skbstat, NLMSG_ALIGN(actual_size));
1394                 nlhstat->nlmsg_len = actual_size;
1395
1396                 err = iscsi_multicast_skb(skbstat, ISCSI_NL_GRP_ISCSID,
1397                                           GFP_ATOMIC);
1398         } while (err < 0 && err != -ECONNREFUSED);
1399
1400         return err;
1401 }
1402
1403 /**
1404  * iscsi_session_event - send session destr. completion event
1405  * @session: iscsi class session
1406  * @event: type of event
1407  */
1408 int iscsi_session_event(struct iscsi_cls_session *session,
1409                         enum iscsi_uevent_e event)
1410 {
1411         struct iscsi_internal *priv;
1412         struct Scsi_Host *shost;
1413         struct iscsi_uevent *ev;
1414         struct sk_buff  *skb;
1415         struct nlmsghdr *nlh;
1416         int rc, len = NLMSG_SPACE(sizeof(*ev));
1417
1418         priv = iscsi_if_transport_lookup(session->transport);
1419         if (!priv)
1420                 return -EINVAL;
1421         shost = iscsi_session_to_shost(session);
1422
1423         skb = alloc_skb(len, GFP_KERNEL);
1424         if (!skb) {
1425                 iscsi_cls_session_printk(KERN_ERR, session,
1426                                          "Cannot notify userspace of session "
1427                                          "event %u\n", event);
1428                 return -ENOMEM;
1429         }
1430
1431         nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
1432         ev = NLMSG_DATA(nlh);
1433         ev->transport_handle = iscsi_handle(session->transport);
1434
1435         ev->type = event;
1436         switch (event) {
1437         case ISCSI_KEVENT_DESTROY_SESSION:
1438                 ev->r.d_session.host_no = shost->host_no;
1439                 ev->r.d_session.sid = session->sid;
1440                 break;
1441         case ISCSI_KEVENT_CREATE_SESSION:
1442                 ev->r.c_session_ret.host_no = shost->host_no;
1443                 ev->r.c_session_ret.sid = session->sid;
1444                 break;
1445         case ISCSI_KEVENT_UNBIND_SESSION:
1446                 ev->r.unbind_session.host_no = shost->host_no;
1447                 ev->r.unbind_session.sid = session->sid;
1448                 break;
1449         default:
1450                 iscsi_cls_session_printk(KERN_ERR, session, "Invalid event "
1451                                          "%u.\n", event);
1452                 kfree_skb(skb);
1453                 return -EINVAL;
1454         }
1455
1456         /*
1457          * this will occur if the daemon is not up, so we just warn
1458          * the user and when the daemon is restarted it will handle it
1459          */
1460         rc = iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
1461         if (rc == -ESRCH)
1462                 iscsi_cls_session_printk(KERN_ERR, session,
1463                                          "Cannot notify userspace of session "
1464                                          "event %u. Check iscsi daemon\n",
1465                                          event);
1466
1467         ISCSI_DBG_TRANS_SESSION(session, "Completed handling event %d rc %d\n",
1468                                 event, rc);
1469         return rc;
1470 }
1471 EXPORT_SYMBOL_GPL(iscsi_session_event);
1472
1473 static int
1474 iscsi_if_create_session(struct iscsi_internal *priv, struct iscsi_endpoint *ep,
1475                         struct iscsi_uevent *ev, uint32_t initial_cmdsn,
1476                         uint16_t cmds_max, uint16_t queue_depth)
1477 {
1478         struct iscsi_transport *transport = priv->iscsi_transport;
1479         struct iscsi_cls_session *session;
1480         struct Scsi_Host *shost;
1481
1482         session = transport->create_session(ep, cmds_max, queue_depth,
1483                                             initial_cmdsn);
1484         if (!session)
1485                 return -ENOMEM;
1486
1487         shost = iscsi_session_to_shost(session);
1488         ev->r.c_session_ret.host_no = shost->host_no;
1489         ev->r.c_session_ret.sid = session->sid;
1490         ISCSI_DBG_TRANS_SESSION(session,
1491                                 "Completed creating transport session\n");
1492         return 0;
1493 }
1494
1495 static int
1496 iscsi_if_create_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1497 {
1498         struct iscsi_cls_conn *conn;
1499         struct iscsi_cls_session *session;
1500
1501         session = iscsi_session_lookup(ev->u.c_conn.sid);
1502         if (!session) {
1503                 printk(KERN_ERR "iscsi: invalid session %d.\n",
1504                        ev->u.c_conn.sid);
1505                 return -EINVAL;
1506         }
1507
1508         conn = transport->create_conn(session, ev->u.c_conn.cid);
1509         if (!conn) {
1510                 iscsi_cls_session_printk(KERN_ERR, session,
1511                                          "couldn't create a new connection.");
1512                 return -ENOMEM;
1513         }
1514
1515         ev->r.c_conn_ret.sid = session->sid;
1516         ev->r.c_conn_ret.cid = conn->cid;
1517
1518         ISCSI_DBG_TRANS_CONN(conn, "Completed creating transport conn\n");
1519         return 0;
1520 }
1521
1522 static int
1523 iscsi_if_destroy_conn(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1524 {
1525         struct iscsi_cls_conn *conn;
1526
1527         conn = iscsi_conn_lookup(ev->u.d_conn.sid, ev->u.d_conn.cid);
1528         if (!conn)
1529                 return -EINVAL;
1530
1531         ISCSI_DBG_TRANS_CONN(conn, "Destroying transport conn\n");
1532         if (transport->destroy_conn)
1533                 transport->destroy_conn(conn);
1534
1535         return 0;
1536 }
1537
1538 static int
1539 iscsi_set_param(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1540 {
1541         char *data = (char*)ev + sizeof(*ev);
1542         struct iscsi_cls_conn *conn;
1543         struct iscsi_cls_session *session;
1544         int err = 0, value = 0;
1545
1546         session = iscsi_session_lookup(ev->u.set_param.sid);
1547         conn = iscsi_conn_lookup(ev->u.set_param.sid, ev->u.set_param.cid);
1548         if (!conn || !session)
1549                 return -EINVAL;
1550
1551         switch (ev->u.set_param.param) {
1552         case ISCSI_PARAM_SESS_RECOVERY_TMO:
1553                 sscanf(data, "%d", &value);
1554                 session->recovery_tmo = value;
1555                 break;
1556         default:
1557                 err = transport->set_param(conn, ev->u.set_param.param,
1558                                            data, ev->u.set_param.len);
1559         }
1560
1561         return err;
1562 }
1563
1564 static int iscsi_if_ep_connect(struct iscsi_transport *transport,
1565                                struct iscsi_uevent *ev, int msg_type)
1566 {
1567         struct iscsi_endpoint *ep;
1568         struct sockaddr *dst_addr;
1569         struct Scsi_Host *shost = NULL;
1570         int non_blocking, err = 0;
1571
1572         if (!transport->ep_connect)
1573                 return -EINVAL;
1574
1575         if (msg_type == ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST) {
1576                 shost = scsi_host_lookup(ev->u.ep_connect_through_host.host_no);
1577                 if (!shost) {
1578                         printk(KERN_ERR "ep connect failed. Could not find "
1579                                "host no %u\n",
1580                                ev->u.ep_connect_through_host.host_no);
1581                         return -ENODEV;
1582                 }
1583                 non_blocking = ev->u.ep_connect_through_host.non_blocking;
1584         } else
1585                 non_blocking = ev->u.ep_connect.non_blocking;
1586
1587         dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1588         ep = transport->ep_connect(shost, dst_addr, non_blocking);
1589         if (IS_ERR(ep)) {
1590                 err = PTR_ERR(ep);
1591                 goto release_host;
1592         }
1593
1594         ev->r.ep_connect_ret.handle = ep->id;
1595 release_host:
1596         if (shost)
1597                 scsi_host_put(shost);
1598         return err;
1599 }
1600
1601 static int iscsi_if_ep_disconnect(struct iscsi_transport *transport,
1602                                   u64 ep_handle)
1603 {
1604         struct iscsi_cls_conn *conn;
1605         struct iscsi_endpoint *ep;
1606
1607         if (!transport->ep_disconnect)
1608                 return -EINVAL;
1609
1610         ep = iscsi_lookup_endpoint(ep_handle);
1611         if (!ep)
1612                 return -EINVAL;
1613         conn = ep->conn;
1614         if (conn) {
1615                 mutex_lock(&conn->ep_mutex);
1616                 conn->ep = NULL;
1617                 mutex_unlock(&conn->ep_mutex);
1618         }
1619
1620         transport->ep_disconnect(ep);
1621         return 0;
1622 }
1623
1624 static int
1625 iscsi_if_transport_ep(struct iscsi_transport *transport,
1626                       struct iscsi_uevent *ev, int msg_type)
1627 {
1628         struct iscsi_endpoint *ep;
1629         int rc = 0;
1630
1631         switch (msg_type) {
1632         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
1633         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1634                 rc = iscsi_if_ep_connect(transport, ev, msg_type);
1635                 break;
1636         case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1637                 if (!transport->ep_poll)
1638                         return -EINVAL;
1639
1640                 ep = iscsi_lookup_endpoint(ev->u.ep_poll.ep_handle);
1641                 if (!ep)
1642                         return -EINVAL;
1643
1644                 ev->r.retcode = transport->ep_poll(ep,
1645                                                    ev->u.ep_poll.timeout_ms);
1646                 break;
1647         case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
1648                 rc = iscsi_if_ep_disconnect(transport,
1649                                             ev->u.ep_disconnect.ep_handle);
1650                 break;
1651         }
1652         return rc;
1653 }
1654
1655 static int
1656 iscsi_tgt_dscvr(struct iscsi_transport *transport,
1657                 struct iscsi_uevent *ev)
1658 {
1659         struct Scsi_Host *shost;
1660         struct sockaddr *dst_addr;
1661         int err;
1662
1663         if (!transport->tgt_dscvr)
1664                 return -EINVAL;
1665
1666         shost = scsi_host_lookup(ev->u.tgt_dscvr.host_no);
1667         if (!shost) {
1668                 printk(KERN_ERR "target discovery could not find host no %u\n",
1669                        ev->u.tgt_dscvr.host_no);
1670                 return -ENODEV;
1671         }
1672
1673
1674         dst_addr = (struct sockaddr *)((char*)ev + sizeof(*ev));
1675         err = transport->tgt_dscvr(shost, ev->u.tgt_dscvr.type,
1676                                    ev->u.tgt_dscvr.enable, dst_addr);
1677         scsi_host_put(shost);
1678         return err;
1679 }
1680
1681 static int
1682 iscsi_set_host_param(struct iscsi_transport *transport,
1683                      struct iscsi_uevent *ev)
1684 {
1685         char *data = (char*)ev + sizeof(*ev);
1686         struct Scsi_Host *shost;
1687         int err;
1688
1689         if (!transport->set_host_param)
1690                 return -ENOSYS;
1691
1692         shost = scsi_host_lookup(ev->u.set_host_param.host_no);
1693         if (!shost) {
1694                 printk(KERN_ERR "set_host_param could not find host no %u\n",
1695                        ev->u.set_host_param.host_no);
1696                 return -ENODEV;
1697         }
1698
1699         err = transport->set_host_param(shost, ev->u.set_host_param.param,
1700                                         data, ev->u.set_host_param.len);
1701         scsi_host_put(shost);
1702         return err;
1703 }
1704
1705 static int
1706 iscsi_set_path(struct iscsi_transport *transport, struct iscsi_uevent *ev)
1707 {
1708         struct Scsi_Host *shost;
1709         struct iscsi_path *params;
1710         int err;
1711
1712         if (!transport->set_path)
1713                 return -ENOSYS;
1714
1715         shost = scsi_host_lookup(ev->u.set_path.host_no);
1716         if (!shost) {
1717                 printk(KERN_ERR "set path could not find host no %u\n",
1718                        ev->u.set_path.host_no);
1719                 return -ENODEV;
1720         }
1721
1722         params = (struct iscsi_path *)((char *)ev + sizeof(*ev));
1723         err = transport->set_path(shost, params);
1724
1725         scsi_host_put(shost);
1726         return err;
1727 }
1728
1729 static int
1730 iscsi_set_iface_params(struct iscsi_transport *transport,
1731                        struct iscsi_uevent *ev)
1732 {
1733         char *data = (char *)ev + sizeof(*ev);
1734         struct Scsi_Host *shost;
1735         int err;
1736
1737         if (!transport->set_iface_param)
1738                 return -ENOSYS;
1739
1740         shost = scsi_host_lookup(ev->u.set_iface_params.host_no);
1741         if (!shost) {
1742                 printk(KERN_ERR "set_iface_params could not find host no %u\n",
1743                        ev->u.set_iface_params.host_no);
1744                 return -ENODEV;
1745         }
1746
1747         err = transport->set_iface_param(shost, data,
1748                                          ev->u.set_iface_params.count);
1749         scsi_host_put(shost);
1750         return err;
1751 }
1752
1753 static int
1754 iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
1755 {
1756         int err = 0;
1757         struct iscsi_uevent *ev = NLMSG_DATA(nlh);
1758         struct iscsi_transport *transport = NULL;
1759         struct iscsi_internal *priv;
1760         struct iscsi_cls_session *session;
1761         struct iscsi_cls_conn *conn;
1762         struct iscsi_endpoint *ep = NULL;
1763
1764         if (nlh->nlmsg_type == ISCSI_UEVENT_PATH_UPDATE)
1765                 *group = ISCSI_NL_GRP_UIP;
1766         else
1767                 *group = ISCSI_NL_GRP_ISCSID;
1768
1769         priv = iscsi_if_transport_lookup(iscsi_ptr(ev->transport_handle));
1770         if (!priv)
1771                 return -EINVAL;
1772         transport = priv->iscsi_transport;
1773
1774         if (!try_module_get(transport->owner))
1775                 return -EINVAL;
1776
1777         switch (nlh->nlmsg_type) {
1778         case ISCSI_UEVENT_CREATE_SESSION:
1779                 err = iscsi_if_create_session(priv, ep, ev,
1780                                               ev->u.c_session.initial_cmdsn,
1781                                               ev->u.c_session.cmds_max,
1782                                               ev->u.c_session.queue_depth);
1783                 break;
1784         case ISCSI_UEVENT_CREATE_BOUND_SESSION:
1785                 ep = iscsi_lookup_endpoint(ev->u.c_bound_session.ep_handle);
1786                 if (!ep) {
1787                         err = -EINVAL;
1788                         break;
1789                 }
1790
1791                 err = iscsi_if_create_session(priv, ep, ev,
1792                                         ev->u.c_bound_session.initial_cmdsn,
1793                                         ev->u.c_bound_session.cmds_max,
1794                                         ev->u.c_bound_session.queue_depth);
1795                 break;
1796         case ISCSI_UEVENT_DESTROY_SESSION:
1797                 session = iscsi_session_lookup(ev->u.d_session.sid);
1798                 if (session)
1799                         transport->destroy_session(session);
1800                 else
1801                         err = -EINVAL;
1802                 break;
1803         case ISCSI_UEVENT_UNBIND_SESSION:
1804                 session = iscsi_session_lookup(ev->u.d_session.sid);
1805                 if (session)
1806                         scsi_queue_work(iscsi_session_to_shost(session),
1807                                         &session->unbind_work);
1808                 else
1809                         err = -EINVAL;
1810                 break;
1811         case ISCSI_UEVENT_CREATE_CONN:
1812                 err = iscsi_if_create_conn(transport, ev);
1813                 break;
1814         case ISCSI_UEVENT_DESTROY_CONN:
1815                 err = iscsi_if_destroy_conn(transport, ev);
1816                 break;
1817         case ISCSI_UEVENT_BIND_CONN:
1818                 session = iscsi_session_lookup(ev->u.b_conn.sid);
1819                 conn = iscsi_conn_lookup(ev->u.b_conn.sid, ev->u.b_conn.cid);
1820
1821                 if (conn && conn->ep)
1822                         iscsi_if_ep_disconnect(transport, conn->ep->id);
1823
1824                 if (!session || !conn) {
1825                         err = -EINVAL;
1826                         break;
1827                 }
1828
1829                 ev->r.retcode = transport->bind_conn(session, conn,
1830                                                 ev->u.b_conn.transport_eph,
1831                                                 ev->u.b_conn.is_leading);
1832                 if (ev->r.retcode || !transport->ep_connect)
1833                         break;
1834
1835                 ep = iscsi_lookup_endpoint(ev->u.b_conn.transport_eph);
1836                 if (ep) {
1837                         ep->conn = conn;
1838
1839                         mutex_lock(&conn->ep_mutex);
1840                         conn->ep = ep;
1841                         mutex_unlock(&conn->ep_mutex);
1842                 } else
1843                         iscsi_cls_conn_printk(KERN_ERR, conn,
1844                                               "Could not set ep conn "
1845                                               "binding\n");
1846                 break;
1847         case ISCSI_UEVENT_SET_PARAM:
1848                 err = iscsi_set_param(transport, ev);
1849                 break;
1850         case ISCSI_UEVENT_START_CONN:
1851                 conn = iscsi_conn_lookup(ev->u.start_conn.sid, ev->u.start_conn.cid);
1852                 if (conn)
1853                         ev->r.retcode = transport->start_conn(conn);
1854                 else
1855                         err = -EINVAL;
1856                 break;
1857         case ISCSI_UEVENT_STOP_CONN:
1858                 conn = iscsi_conn_lookup(ev->u.stop_conn.sid, ev->u.stop_conn.cid);
1859                 if (conn)
1860                         transport->stop_conn(conn, ev->u.stop_conn.flag);
1861                 else
1862                         err = -EINVAL;
1863                 break;
1864         case ISCSI_UEVENT_SEND_PDU:
1865                 conn = iscsi_conn_lookup(ev->u.send_pdu.sid, ev->u.send_pdu.cid);
1866                 if (conn)
1867                         ev->r.retcode = transport->send_pdu(conn,
1868                                 (struct iscsi_hdr*)((char*)ev + sizeof(*ev)),
1869                                 (char*)ev + sizeof(*ev) + ev->u.send_pdu.hdr_size,
1870                                 ev->u.send_pdu.data_size);
1871                 else
1872                         err = -EINVAL;
1873                 break;
1874         case ISCSI_UEVENT_GET_STATS:
1875                 err = iscsi_if_get_stats(transport, nlh);
1876                 break;
1877         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT:
1878         case ISCSI_UEVENT_TRANSPORT_EP_POLL:
1879         case ISCSI_UEVENT_TRANSPORT_EP_DISCONNECT:
1880         case ISCSI_UEVENT_TRANSPORT_EP_CONNECT_THROUGH_HOST:
1881                 err = iscsi_if_transport_ep(transport, ev, nlh->nlmsg_type);
1882                 break;
1883         case ISCSI_UEVENT_TGT_DSCVR:
1884                 err = iscsi_tgt_dscvr(transport, ev);
1885                 break;
1886         case ISCSI_UEVENT_SET_HOST_PARAM:
1887                 err = iscsi_set_host_param(transport, ev);
1888                 break;
1889         case ISCSI_UEVENT_PATH_UPDATE:
1890                 err = iscsi_set_path(transport, ev);
1891                 break;
1892         case ISCSI_UEVENT_SET_IFACE_PARAMS:
1893                 err = iscsi_set_iface_params(transport, ev);
1894                 break;
1895         default:
1896                 err = -ENOSYS;
1897                 break;
1898         }
1899
1900         module_put(transport->owner);
1901         return err;
1902 }
1903
1904 /*
1905  * Get message from skb.  Each message is processed by iscsi_if_recv_msg.
1906  * Malformed skbs with wrong lengths or invalid creds are not processed.
1907  */
1908 static void
1909 iscsi_if_rx(struct sk_buff *skb)
1910 {
1911         mutex_lock(&rx_queue_mutex);
1912         while (skb->len >= NLMSG_SPACE(0)) {
1913                 int err;
1914                 uint32_t rlen;
1915                 struct nlmsghdr *nlh;
1916                 struct iscsi_uevent *ev;
1917                 uint32_t group;
1918
1919                 nlh = nlmsg_hdr(skb);
1920                 if (nlh->nlmsg_len < sizeof(*nlh) ||
1921                     skb->len < nlh->nlmsg_len) {
1922                         break;
1923                 }
1924
1925                 ev = NLMSG_DATA(nlh);
1926                 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
1927                 if (rlen > skb->len)
1928                         rlen = skb->len;
1929
1930                 err = iscsi_if_recv_msg(skb, nlh, &group);
1931                 if (err) {
1932                         ev->type = ISCSI_KEVENT_IF_ERROR;
1933                         ev->iferror = err;
1934                 }
1935                 do {
1936                         /*
1937                          * special case for GET_STATS:
1938                          * on success - sending reply and stats from
1939                          * inside of if_recv_msg(),
1940                          * on error - fall through.
1941                          */
1942                         if (ev->type == ISCSI_UEVENT_GET_STATS && !err)
1943                                 break;
1944                         err = iscsi_if_send_reply(group, nlh->nlmsg_seq,
1945                                 nlh->nlmsg_type, 0, 0, ev, sizeof(*ev));
1946                 } while (err < 0 && err != -ECONNREFUSED);
1947                 skb_pull(skb, rlen);
1948         }
1949         mutex_unlock(&rx_queue_mutex);
1950 }
1951
1952 #define ISCSI_CLASS_ATTR(_prefix,_name,_mode,_show,_store)              \
1953 struct device_attribute dev_attr_##_prefix##_##_name =  \
1954         __ATTR(_name,_mode,_show,_store)
1955
1956 /*
1957  * iSCSI connection attrs
1958  */
1959 #define iscsi_conn_attr_show(param)                                     \
1960 static ssize_t                                                          \
1961 show_conn_param_##param(struct device *dev,                             \
1962                         struct device_attribute *attr, char *buf)       \
1963 {                                                                       \
1964         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);   \
1965         struct iscsi_transport *t = conn->transport;                    \
1966         return t->get_conn_param(conn, param, buf);                     \
1967 }
1968
1969 #define iscsi_conn_attr(field, param)                                   \
1970         iscsi_conn_attr_show(param)                                     \
1971 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO, show_conn_param_##param,  \
1972                         NULL);
1973
1974 iscsi_conn_attr(max_recv_dlength, ISCSI_PARAM_MAX_RECV_DLENGTH);
1975 iscsi_conn_attr(max_xmit_dlength, ISCSI_PARAM_MAX_XMIT_DLENGTH);
1976 iscsi_conn_attr(header_digest, ISCSI_PARAM_HDRDGST_EN);
1977 iscsi_conn_attr(data_digest, ISCSI_PARAM_DATADGST_EN);
1978 iscsi_conn_attr(ifmarker, ISCSI_PARAM_IFMARKER_EN);
1979 iscsi_conn_attr(ofmarker, ISCSI_PARAM_OFMARKER_EN);
1980 iscsi_conn_attr(persistent_port, ISCSI_PARAM_PERSISTENT_PORT);
1981 iscsi_conn_attr(exp_statsn, ISCSI_PARAM_EXP_STATSN);
1982 iscsi_conn_attr(persistent_address, ISCSI_PARAM_PERSISTENT_ADDRESS);
1983 iscsi_conn_attr(ping_tmo, ISCSI_PARAM_PING_TMO);
1984 iscsi_conn_attr(recv_tmo, ISCSI_PARAM_RECV_TMO);
1985
1986 #define iscsi_conn_ep_attr_show(param)                                  \
1987 static ssize_t show_conn_ep_param_##param(struct device *dev,           \
1988                                           struct device_attribute *attr,\
1989                                           char *buf)                    \
1990 {                                                                       \
1991         struct iscsi_cls_conn *conn = iscsi_dev_to_conn(dev->parent);   \
1992         struct iscsi_transport *t = conn->transport;                    \
1993         struct iscsi_endpoint *ep;                                      \
1994         ssize_t rc;                                                     \
1995                                                                         \
1996         /*                                                              \
1997          * Need to make sure ep_disconnect does not free the LLD's      \
1998          * interconnect resources while we are trying to read them.     \
1999          */                                                             \
2000         mutex_lock(&conn->ep_mutex);                                    \
2001         ep = conn->ep;                                                  \
2002         if (!ep && t->ep_connect) {                                     \
2003                 mutex_unlock(&conn->ep_mutex);                          \
2004                 return -ENOTCONN;                                       \
2005         }                                                               \
2006                                                                         \
2007         if (ep)                                                         \
2008                 rc = t->get_ep_param(ep, param, buf);                   \
2009         else                                                            \
2010                 rc = t->get_conn_param(conn, param, buf);               \
2011         mutex_unlock(&conn->ep_mutex);                                  \
2012         return rc;                                                      \
2013 }
2014
2015 #define iscsi_conn_ep_attr(field, param)                                \
2016         iscsi_conn_ep_attr_show(param)                                  \
2017 static ISCSI_CLASS_ATTR(conn, field, S_IRUGO,                           \
2018                         show_conn_ep_param_##param, NULL);
2019
2020 iscsi_conn_ep_attr(address, ISCSI_PARAM_CONN_ADDRESS);
2021 iscsi_conn_ep_attr(port, ISCSI_PARAM_CONN_PORT);
2022
2023 static struct attribute *iscsi_conn_attrs[] = {
2024         &dev_attr_conn_max_recv_dlength.attr,
2025         &dev_attr_conn_max_xmit_dlength.attr,
2026         &dev_attr_conn_header_digest.attr,
2027         &dev_attr_conn_data_digest.attr,
2028         &dev_attr_conn_ifmarker.attr,
2029         &dev_attr_conn_ofmarker.attr,
2030         &dev_attr_conn_address.attr,
2031         &dev_attr_conn_port.attr,
2032         &dev_attr_conn_exp_statsn.attr,
2033         &dev_attr_conn_persistent_address.attr,
2034         &dev_attr_conn_persistent_port.attr,
2035         &dev_attr_conn_ping_tmo.attr,
2036         &dev_attr_conn_recv_tmo.attr,
2037         NULL,
2038 };
2039
2040 static mode_t iscsi_conn_attr_is_visible(struct kobject *kobj,
2041                                          struct attribute *attr, int i)
2042 {
2043         struct device *cdev = container_of(kobj, struct device, kobj);
2044         struct iscsi_cls_conn *conn = transport_class_to_conn(cdev);
2045         struct iscsi_transport *t = conn->transport;
2046         int param;
2047
2048         if (attr == &dev_attr_conn_max_recv_dlength.attr)
2049                 param = ISCSI_PARAM_MAX_RECV_DLENGTH;
2050         else if (attr == &dev_attr_conn_max_xmit_dlength.attr)
2051                 param = ISCSI_PARAM_MAX_XMIT_DLENGTH;
2052         else if (attr == &dev_attr_conn_header_digest.attr)
2053                 param = ISCSI_PARAM_HDRDGST_EN;
2054         else if (attr == &dev_attr_conn_data_digest.attr)
2055                 param = ISCSI_PARAM_DATADGST_EN;
2056         else if (attr == &dev_attr_conn_ifmarker.attr)
2057                 param = ISCSI_PARAM_IFMARKER_EN;
2058         else if (attr == &dev_attr_conn_ofmarker.attr)
2059                 param = ISCSI_PARAM_OFMARKER_EN;
2060         else if (attr == &dev_attr_conn_address.attr)
2061                 param = ISCSI_PARAM_CONN_ADDRESS;
2062         else if (attr == &dev_attr_conn_port.attr)
2063                 param = ISCSI_PARAM_CONN_PORT;
2064         else if (attr == &dev_attr_conn_exp_statsn.attr)
2065                 param = ISCSI_PARAM_EXP_STATSN;
2066         else if (attr == &dev_attr_conn_persistent_address.attr)
2067                 param = ISCSI_PARAM_PERSISTENT_ADDRESS;
2068         else if (attr == &dev_attr_conn_persistent_port.attr)
2069                 param = ISCSI_PARAM_PERSISTENT_PORT;
2070         else if (attr == &dev_attr_conn_ping_tmo.attr)
2071                 param = ISCSI_PARAM_PING_TMO;
2072         else if (attr == &dev_attr_conn_recv_tmo.attr)
2073                 param = ISCSI_PARAM_RECV_TMO;
2074         else {
2075                 WARN_ONCE(1, "Invalid conn attr");
2076                 return 0;
2077         }
2078
2079         return t->attr_is_visible(ISCSI_PARAM, param);
2080 }
2081
2082 static struct attribute_group iscsi_conn_group = {
2083         .attrs = iscsi_conn_attrs,
2084         .is_visible = iscsi_conn_attr_is_visible,
2085 };
2086
2087 /*
2088  * iSCSI session attrs
2089  */
2090 #define iscsi_session_attr_show(param, perm)                            \
2091 static ssize_t                                                          \
2092 show_session_param_##param(struct device *dev,                          \
2093                            struct device_attribute *attr, char *buf)    \
2094 {                                                                       \
2095         struct iscsi_cls_session *session =                             \
2096                 iscsi_dev_to_session(dev->parent);                      \
2097         struct iscsi_transport *t = session->transport;                 \
2098                                                                         \
2099         if (perm && !capable(CAP_SYS_ADMIN))                            \
2100                 return -EACCES;                                         \
2101         return t->get_session_param(session, param, buf);               \
2102 }
2103
2104 #define iscsi_session_attr(field, param, perm)                          \
2105         iscsi_session_attr_show(param, perm)                            \
2106 static ISCSI_CLASS_ATTR(sess, field, S_IRUGO, show_session_param_##param, \
2107                         NULL);
2108 iscsi_session_attr(targetname, ISCSI_PARAM_TARGET_NAME, 0);
2109 iscsi_session_attr(initial_r2t, ISCSI_PARAM_INITIAL_R2T_EN, 0);
2110 iscsi_session_attr(max_outstanding_r2t, ISCSI_PARAM_MAX_R2T, 0);
2111 iscsi_session_attr(immediate_data, ISCSI_PARAM_IMM_DATA_EN, 0);
2112 iscsi_session_attr(first_burst_len, ISCSI_PARAM_FIRST_BURST, 0);
2113 iscsi_session_attr(max_burst_len, ISCSI_PARAM_MAX_BURST, 0);
2114 iscsi_session_attr(data_pdu_in_order, ISCSI_PARAM_PDU_INORDER_EN, 0);
2115 iscsi_session_attr(data_seq_in_order, ISCSI_PARAM_DATASEQ_INORDER_EN, 0);
2116 iscsi_session_attr(erl, ISCSI_PARAM_ERL, 0);
2117 iscsi_session_attr(tpgt, ISCSI_PARAM_TPGT, 0);
2118 iscsi_session_attr(username, ISCSI_PARAM_USERNAME, 1);
2119 iscsi_session_attr(username_in, ISCSI_PARAM_USERNAME_IN, 1);
2120 iscsi_session_attr(password, ISCSI_PARAM_PASSWORD, 1);
2121 iscsi_session_attr(password_in, ISCSI_PARAM_PASSWORD_IN, 1);
2122 iscsi_session_attr(fast_abort, ISCSI_PARAM_FAST_ABORT, 0);
2123 iscsi_session_attr(abort_tmo, ISCSI_PARAM_ABORT_TMO, 0);
2124 iscsi_session_attr(lu_reset_tmo, ISCSI_PARAM_LU_RESET_TMO, 0);
2125 iscsi_session_attr(tgt_reset_tmo, ISCSI_PARAM_TGT_RESET_TMO, 0);
2126 iscsi_session_attr(ifacename, ISCSI_PARAM_IFACE_NAME, 0);
2127 iscsi_session_attr(initiatorname, ISCSI_PARAM_INITIATOR_NAME, 0);
2128 iscsi_session_attr(targetalias, ISCSI_PARAM_TARGET_ALIAS, 0);
2129
2130 static ssize_t
2131 show_priv_session_state(struct device *dev, struct device_attribute *attr,
2132                         char *buf)
2133 {
2134         struct iscsi_cls_session *session = iscsi_dev_to_session(dev->parent);
2135         return sprintf(buf, "%s\n", iscsi_session_state_name(session->state));
2136 }
2137 static ISCSI_CLASS_ATTR(priv_sess, state, S_IRUGO, show_priv_session_state,
2138                         NULL);
2139
2140 #define iscsi_priv_session_attr_show(field, format)                     \
2141 static ssize_t                                                          \
2142 show_priv_session_##field(struct device *dev,                           \
2143                           struct device_attribute *attr, char *buf)     \
2144 {                                                                       \
2145         struct iscsi_cls_session *session =                             \
2146                         iscsi_dev_to_session(dev->parent);              \
2147         if (session->field == -1)                                       \
2148                 return sprintf(buf, "off\n");                           \
2149         return sprintf(buf, format"\n", session->field);                \
2150 }
2151
2152 #define iscsi_priv_session_attr_store(field)                            \
2153 static ssize_t                                                          \
2154 store_priv_session_##field(struct device *dev,                          \
2155                            struct device_attribute *attr,               \
2156                            const char *buf, size_t count)               \
2157 {                                                                       \
2158         int val;                                                        \
2159         char *cp;                                                       \
2160         struct iscsi_cls_session *session =                             \
2161                 iscsi_dev_to_session(dev->parent);                      \
2162         if ((session->state == ISCSI_SESSION_FREE) ||                   \
2163             (session->state == ISCSI_SESSION_FAILED))                   \
2164                 return -EBUSY;                                          \
2165         if (strncmp(buf, "off", 3) == 0)                                \
2166                 session->field = -1;                                    \
2167         else {                                                          \
2168                 val = simple_strtoul(buf, &cp, 0);                      \
2169                 if (*cp != '\0' && *cp != '\n')                         \
2170                         return -EINVAL;                                 \
2171                 session->field = val;                                   \
2172         }                                                               \
2173         return count;                                                   \
2174 }
2175
2176 #define iscsi_priv_session_rw_attr(field, format)                       \
2177         iscsi_priv_session_attr_show(field, format)                     \
2178         iscsi_priv_session_attr_store(field)                            \
2179 static ISCSI_CLASS_ATTR(priv_sess, field, S_IRUGO | S_IWUSR,            \
2180                         show_priv_session_##field,                      \
2181                         store_priv_session_##field)
2182 iscsi_priv_session_rw_attr(recovery_tmo, "%d");
2183
2184 static struct attribute *iscsi_session_attrs[] = {
2185         &dev_attr_sess_initial_r2t.attr,
2186         &dev_attr_sess_max_outstanding_r2t.attr,
2187         &dev_attr_sess_immediate_data.attr,
2188         &dev_attr_sess_first_burst_len.attr,
2189         &dev_attr_sess_max_burst_len.attr,
2190         &dev_attr_sess_data_pdu_in_order.attr,
2191         &dev_attr_sess_data_seq_in_order.attr,
2192         &dev_attr_sess_erl.attr,
2193         &dev_attr_sess_targetname.attr,
2194         &dev_attr_sess_tpgt.attr,
2195         &dev_attr_sess_password.attr,
2196         &dev_attr_sess_password_in.attr,
2197         &dev_attr_sess_username.attr,
2198         &dev_attr_sess_username_in.attr,
2199         &dev_attr_sess_fast_abort.attr,
2200         &dev_attr_sess_abort_tmo.attr,
2201         &dev_attr_sess_lu_reset_tmo.attr,
2202         &dev_attr_sess_tgt_reset_tmo.attr,
2203         &dev_attr_sess_ifacename.attr,
2204         &dev_attr_sess_initiatorname.attr,
2205         &dev_attr_sess_targetalias.attr,
2206         &dev_attr_priv_sess_recovery_tmo.attr,
2207         &dev_attr_priv_sess_state.attr,
2208         NULL,
2209 };
2210
2211 static mode_t iscsi_session_attr_is_visible(struct kobject *kobj,
2212                                             struct attribute *attr, int i)
2213 {
2214         struct device *cdev = container_of(kobj, struct device, kobj);
2215         struct iscsi_cls_session *session = transport_class_to_session(cdev);
2216         struct iscsi_transport *t = session->transport;
2217         int param;
2218
2219         if (attr == &dev_attr_sess_initial_r2t.attr)
2220                 param = ISCSI_PARAM_INITIAL_R2T_EN;
2221         else if (attr == &dev_attr_sess_max_outstanding_r2t.attr)
2222                 param = ISCSI_PARAM_MAX_R2T;
2223         else if (attr == &dev_attr_sess_immediate_data.attr)
2224                 param = ISCSI_PARAM_IMM_DATA_EN;
2225         else if (attr == &dev_attr_sess_first_burst_len.attr)
2226                 param = ISCSI_PARAM_FIRST_BURST;
2227         else if (attr == &dev_attr_sess_max_burst_len.attr)
2228                 param = ISCSI_PARAM_MAX_BURST;
2229         else if (attr == &dev_attr_sess_data_pdu_in_order.attr)
2230                 param = ISCSI_PARAM_PDU_INORDER_EN;
2231         else if (attr == &dev_attr_sess_data_seq_in_order.attr)
2232                 param = ISCSI_PARAM_DATASEQ_INORDER_EN;
2233         else if (attr == &dev_attr_sess_erl.attr)
2234                 param = ISCSI_PARAM_ERL;
2235         else if (attr == &dev_attr_sess_targetname.attr)
2236                 param = ISCSI_PARAM_TARGET_NAME;
2237         else if (attr == &dev_attr_sess_tpgt.attr)
2238                 param = ISCSI_PARAM_TPGT;
2239         else if (attr == &dev_attr_sess_password.attr)
2240                 param = ISCSI_PARAM_USERNAME;
2241         else if (attr == &dev_attr_sess_password_in.attr)
2242                 param = ISCSI_PARAM_USERNAME_IN;
2243         else if (attr == &dev_attr_sess_username.attr)
2244                 param = ISCSI_PARAM_PASSWORD;
2245         else if (attr == &dev_attr_sess_username_in.attr)
2246                 param = ISCSI_PARAM_PASSWORD_IN;
2247         else if (attr == &dev_attr_sess_fast_abort.attr)
2248                 param = ISCSI_PARAM_FAST_ABORT;
2249         else if (attr == &dev_attr_sess_abort_tmo.attr)
2250                 param = ISCSI_PARAM_ABORT_TMO;
2251         else if (attr == &dev_attr_sess_lu_reset_tmo.attr)
2252                 param = ISCSI_PARAM_LU_RESET_TMO;
2253         else if (attr == &dev_attr_sess_tgt_reset_tmo.attr)
2254                 param = ISCSI_PARAM_TGT_RESET_TMO;
2255         else if (attr == &dev_attr_sess_ifacename.attr)
2256                 param = ISCSI_PARAM_IFACE_NAME;
2257         else if (attr == &dev_attr_sess_initiatorname.attr)
2258                 param = ISCSI_PARAM_INITIATOR_NAME;
2259         else if (attr == &dev_attr_sess_targetalias.attr)
2260                 param = ISCSI_PARAM_TARGET_ALIAS;
2261         else if (attr == &dev_attr_priv_sess_recovery_tmo.attr)
2262                 return S_IRUGO | S_IWUSR;
2263         else if (attr == &dev_attr_priv_sess_state.attr)
2264                 return S_IRUGO;
2265         else {
2266                 WARN_ONCE(1, "Invalid session attr");
2267                 return 0;
2268         }
2269
2270         return t->attr_is_visible(ISCSI_PARAM, param);
2271 }
2272
2273 static struct attribute_group iscsi_session_group = {
2274         .attrs = iscsi_session_attrs,
2275         .is_visible = iscsi_session_attr_is_visible,
2276 };
2277
2278 /*
2279  * iSCSI host attrs
2280  */
2281 #define iscsi_host_attr_show(param)                                     \
2282 static ssize_t                                                          \
2283 show_host_param_##param(struct device *dev,                             \
2284                         struct device_attribute *attr, char *buf)       \
2285 {                                                                       \
2286         struct Scsi_Host *shost = transport_class_to_shost(dev);        \
2287         struct iscsi_internal *priv = to_iscsi_internal(shost->transportt); \
2288         return priv->iscsi_transport->get_host_param(shost, param, buf); \
2289 }
2290
2291 #define iscsi_host_attr(field, param)                                   \
2292         iscsi_host_attr_show(param)                                     \
2293 static ISCSI_CLASS_ATTR(host, field, S_IRUGO, show_host_param_##param,  \
2294                         NULL);
2295
2296 iscsi_host_attr(netdev, ISCSI_HOST_PARAM_NETDEV_NAME);
2297 iscsi_host_attr(hwaddress, ISCSI_HOST_PARAM_HWADDRESS);
2298 iscsi_host_attr(ipaddress, ISCSI_HOST_PARAM_IPADDRESS);
2299 iscsi_host_attr(initiatorname, ISCSI_HOST_PARAM_INITIATOR_NAME);
2300
2301 static struct attribute *iscsi_host_attrs[] = {
2302         &dev_attr_host_netdev.attr,
2303         &dev_attr_host_hwaddress.attr,
2304         &dev_attr_host_ipaddress.attr,
2305         &dev_attr_host_initiatorname.attr,
2306         NULL,
2307 };
2308
2309 static mode_t iscsi_host_attr_is_visible(struct kobject *kobj,
2310                                          struct attribute *attr, int i)
2311 {
2312         struct device *cdev = container_of(kobj, struct device, kobj);
2313         struct Scsi_Host *shost = transport_class_to_shost(cdev);
2314         struct iscsi_internal *priv = to_iscsi_internal(shost->transportt);
2315         int param;
2316
2317         if (attr == &dev_attr_host_netdev.attr)
2318                 param = ISCSI_HOST_PARAM_NETDEV_NAME;
2319         else if (attr == &dev_attr_host_hwaddress.attr)
2320                 param = ISCSI_HOST_PARAM_HWADDRESS;
2321         else if (attr == &dev_attr_host_ipaddress.attr)
2322                 param = ISCSI_HOST_PARAM_IPADDRESS;
2323         else if (attr == &dev_attr_host_initiatorname.attr)
2324                 param = ISCSI_HOST_PARAM_INITIATOR_NAME;
2325         else {
2326                 WARN_ONCE(1, "Invalid host attr");
2327                 return 0;
2328         }
2329
2330         return priv->iscsi_transport->attr_is_visible(ISCSI_HOST_PARAM, param);
2331 }
2332
2333 static struct attribute_group iscsi_host_group = {
2334         .attrs = iscsi_host_attrs,
2335         .is_visible = iscsi_host_attr_is_visible,
2336 };
2337
2338 static int iscsi_session_match(struct attribute_container *cont,
2339                            struct device *dev)
2340 {
2341         struct iscsi_cls_session *session;
2342         struct Scsi_Host *shost;
2343         struct iscsi_internal *priv;
2344
2345         if (!iscsi_is_session_dev(dev))
2346                 return 0;
2347
2348         session = iscsi_dev_to_session(dev);
2349         shost = iscsi_session_to_shost(session);
2350         if (!shost->transportt)
2351                 return 0;
2352
2353         priv = to_iscsi_internal(shost->transportt);
2354         if (priv->session_cont.ac.class != &iscsi_session_class.class)
2355                 return 0;
2356
2357         return &priv->session_cont.ac == cont;
2358 }
2359
2360 static int iscsi_conn_match(struct attribute_container *cont,
2361                            struct device *dev)
2362 {
2363         struct iscsi_cls_session *session;
2364         struct iscsi_cls_conn *conn;
2365         struct Scsi_Host *shost;
2366         struct iscsi_internal *priv;
2367
2368         if (!iscsi_is_conn_dev(dev))
2369                 return 0;
2370
2371         conn = iscsi_dev_to_conn(dev);
2372         session = iscsi_dev_to_session(conn->dev.parent);
2373         shost = iscsi_session_to_shost(session);
2374
2375         if (!shost->transportt)
2376                 return 0;
2377
2378         priv = to_iscsi_internal(shost->transportt);
2379         if (priv->conn_cont.ac.class != &iscsi_connection_class.class)
2380                 return 0;
2381
2382         return &priv->conn_cont.ac == cont;
2383 }
2384
2385 static int iscsi_host_match(struct attribute_container *cont,
2386                             struct device *dev)
2387 {
2388         struct Scsi_Host *shost;
2389         struct iscsi_internal *priv;
2390
2391         if (!scsi_is_host_device(dev))
2392                 return 0;
2393
2394         shost = dev_to_shost(dev);
2395         if (!shost->transportt  ||
2396             shost->transportt->host_attrs.ac.class != &iscsi_host_class.class)
2397                 return 0;
2398
2399         priv = to_iscsi_internal(shost->transportt);
2400         return &priv->t.host_attrs.ac == cont;
2401 }
2402
2403 struct scsi_transport_template *
2404 iscsi_register_transport(struct iscsi_transport *tt)
2405 {
2406         struct iscsi_internal *priv;
2407         unsigned long flags;
2408         int err;
2409
2410         BUG_ON(!tt);
2411
2412         priv = iscsi_if_transport_lookup(tt);
2413         if (priv)
2414                 return NULL;
2415
2416         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
2417         if (!priv)
2418                 return NULL;
2419         INIT_LIST_HEAD(&priv->list);
2420         priv->iscsi_transport = tt;
2421         priv->t.user_scan = iscsi_user_scan;
2422         priv->t.create_work_queue = 1;
2423
2424         priv->dev.class = &iscsi_transport_class;
2425         dev_set_name(&priv->dev, "%s", tt->name);
2426         err = device_register(&priv->dev);
2427         if (err)
2428                 goto free_priv;
2429
2430         err = sysfs_create_group(&priv->dev.kobj, &iscsi_transport_group);
2431         if (err)
2432                 goto unregister_dev;
2433
2434         /* host parameters */
2435         priv->t.host_attrs.ac.class = &iscsi_host_class.class;
2436         priv->t.host_attrs.ac.match = iscsi_host_match;
2437         priv->t.host_attrs.ac.grp = &iscsi_host_group;
2438         priv->t.host_size = sizeof(struct iscsi_cls_host);
2439         transport_container_register(&priv->t.host_attrs);
2440
2441         /* connection parameters */
2442         priv->conn_cont.ac.class = &iscsi_connection_class.class;
2443         priv->conn_cont.ac.match = iscsi_conn_match;
2444         priv->conn_cont.ac.grp = &iscsi_conn_group;
2445         transport_container_register(&priv->conn_cont);
2446
2447         /* session parameters */
2448         priv->session_cont.ac.class = &iscsi_session_class.class;
2449         priv->session_cont.ac.match = iscsi_session_match;
2450         priv->session_cont.ac.grp = &iscsi_session_group;
2451         transport_container_register(&priv->session_cont);
2452
2453         spin_lock_irqsave(&iscsi_transport_lock, flags);
2454         list_add(&priv->list, &iscsi_transports);
2455         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2456
2457         printk(KERN_NOTICE "iscsi: registered transport (%s)\n", tt->name);
2458         return &priv->t;
2459
2460 unregister_dev:
2461         device_unregister(&priv->dev);
2462         return NULL;
2463 free_priv:
2464         kfree(priv);
2465         return NULL;
2466 }
2467 EXPORT_SYMBOL_GPL(iscsi_register_transport);
2468
2469 int iscsi_unregister_transport(struct iscsi_transport *tt)
2470 {
2471         struct iscsi_internal *priv;
2472         unsigned long flags;
2473
2474         BUG_ON(!tt);
2475
2476         mutex_lock(&rx_queue_mutex);
2477
2478         priv = iscsi_if_transport_lookup(tt);
2479         BUG_ON (!priv);
2480
2481         spin_lock_irqsave(&iscsi_transport_lock, flags);
2482         list_del(&priv->list);
2483         spin_unlock_irqrestore(&iscsi_transport_lock, flags);
2484
2485         transport_container_unregister(&priv->conn_cont);
2486         transport_container_unregister(&priv->session_cont);
2487         transport_container_unregister(&priv->t.host_attrs);
2488
2489         sysfs_remove_group(&priv->dev.kobj, &iscsi_transport_group);
2490         device_unregister(&priv->dev);
2491         mutex_unlock(&rx_queue_mutex);
2492
2493         return 0;
2494 }
2495 EXPORT_SYMBOL_GPL(iscsi_unregister_transport);
2496
2497 static __init int iscsi_transport_init(void)
2498 {
2499         int err;
2500
2501         printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
2502                 ISCSI_TRANSPORT_VERSION);
2503
2504         atomic_set(&iscsi_session_nr, 0);
2505
2506         err = class_register(&iscsi_transport_class);
2507         if (err)
2508                 return err;
2509
2510         err = class_register(&iscsi_endpoint_class);
2511         if (err)
2512                 goto unregister_transport_class;
2513
2514         err = class_register(&iscsi_iface_class);
2515         if (err)
2516                 goto unregister_endpoint_class;
2517
2518         err = transport_class_register(&iscsi_host_class);
2519         if (err)
2520                 goto unregister_iface_class;
2521
2522         err = transport_class_register(&iscsi_connection_class);
2523         if (err)
2524                 goto unregister_host_class;
2525
2526         err = transport_class_register(&iscsi_session_class);
2527         if (err)
2528                 goto unregister_conn_class;
2529
2530         nls = netlink_kernel_create(&init_net, NETLINK_ISCSI, 1, iscsi_if_rx,
2531                                     NULL, THIS_MODULE);
2532         if (!nls) {
2533                 err = -ENOBUFS;
2534                 goto unregister_session_class;
2535         }
2536
2537         iscsi_eh_timer_workq = create_singlethread_workqueue("iscsi_eh");
2538         if (!iscsi_eh_timer_workq)
2539                 goto release_nls;
2540
2541         return 0;
2542
2543 release_nls:
2544         netlink_kernel_release(nls);
2545 unregister_session_class:
2546         transport_class_unregister(&iscsi_session_class);
2547 unregister_conn_class:
2548         transport_class_unregister(&iscsi_connection_class);
2549 unregister_host_class:
2550         transport_class_unregister(&iscsi_host_class);
2551 unregister_iface_class:
2552         class_unregister(&iscsi_iface_class);
2553 unregister_endpoint_class:
2554         class_unregister(&iscsi_endpoint_class);
2555 unregister_transport_class:
2556         class_unregister(&iscsi_transport_class);
2557         return err;
2558 }
2559
2560 static void __exit iscsi_transport_exit(void)
2561 {
2562         destroy_workqueue(iscsi_eh_timer_workq);
2563         netlink_kernel_release(nls);
2564         transport_class_unregister(&iscsi_connection_class);
2565         transport_class_unregister(&iscsi_session_class);
2566         transport_class_unregister(&iscsi_host_class);
2567         class_unregister(&iscsi_endpoint_class);
2568         class_unregister(&iscsi_iface_class);
2569         class_unregister(&iscsi_transport_class);
2570 }
2571
2572 module_init(iscsi_transport_init);
2573 module_exit(iscsi_transport_exit);
2574
2575 MODULE_AUTHOR("Mike Christie <michaelc@cs.wisc.edu>, "
2576               "Dmitry Yusupov <dmitry_yus@yahoo.com>, "
2577               "Alex Aizman <itn780@yahoo.com>");
2578 MODULE_DESCRIPTION("iSCSI Transport Interface");
2579 MODULE_LICENSE("GPL");
2580 MODULE_VERSION(ISCSI_TRANSPORT_VERSION);
2581 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_ISCSI);