drivers/target/iscsi/iscsi_target.c

   1 /*******************************************************************************
   2  * This file contains main functions related to the iSCSI Target Core Driver.
   3  *
   4  * (c) Copyright 2007-2013 Datera, Inc.
   5  *
   6  * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  ******************************************************************************/
  18
  19 #include <linux/string.h>
  20 #include <linux/kthread.h>
  21 #include <linux/crypto.h>
  22 #include <linux/completion.h>
  23 #include <linux/module.h>
  24 #include <linux/idr.h>
  25 #include <asm/unaligned.h>
  26 #include <scsi/scsi_device.h>
  27 #include <scsi/iscsi_proto.h>
  28 #include <scsi/scsi_tcq.h>
  29 #include <target/target_core_base.h>
  30 #include <target/target_core_fabric.h>
  31 #include <target/target_core_configfs.h>
  32
  33 #include "iscsi_target_core.h"
  34 #include "iscsi_target_parameters.h"
  35 #include "iscsi_target_seq_pdu_list.h"
  36 #include "iscsi_target_tq.h"
  37 #include "iscsi_target_configfs.h"
  38 #include "iscsi_target_datain_values.h"
  39 #include "iscsi_target_erl0.h"
  40 #include "iscsi_target_erl1.h"
  41 #include "iscsi_target_erl2.h"
  42 #include "iscsi_target_login.h"
  43 #include "iscsi_target_tmr.h"
  44 #include "iscsi_target_tpg.h"
  45 #include "iscsi_target_util.h"
  46 #include "iscsi_target.h"
  47 #include "iscsi_target_device.h"
  48 #include "iscsi_target_stat.h"
  49
  50 #include <target/iscsi/iscsi_transport.h>
  51
  52 static LIST_HEAD(g_tiqn_list);
  53 static LIST_HEAD(g_np_list);
  54 static DEFINE_SPINLOCK(tiqn_lock);
  55 static DEFINE_SPINLOCK(np_lock);
  56
  57 static struct idr tiqn_idr;
  58 struct idr sess_idr;
  59 struct mutex auth_id_lock;
  60 spinlock_t sess_idr_lock;
  61
  62 struct iscsit_global *iscsit_global;
  63
  64 struct kmem_cache *lio_qr_cache;
  65 struct kmem_cache *lio_dr_cache;
  66 struct kmem_cache *lio_ooo_cache;
  67 struct kmem_cache *lio_r2t_cache;
  68
  69 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
  70                         struct iscsi_scsi_req *, u32);
  71
  72 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
  73 {
  74         struct iscsi_tiqn *tiqn = NULL;
  75
  76         spin_lock(&tiqn_lock);
  77         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
  78                 if (!strcmp(tiqn->tiqn, buf)) {
  79
  80                         spin_lock(&tiqn->tiqn_state_lock);
  81                         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
  82                                 tiqn->tiqn_access_count++;
  83                                 spin_unlock(&tiqn->tiqn_state_lock);
  84                                 spin_unlock(&tiqn_lock);
  85                                 return tiqn;
  86                         }
  87                         spin_unlock(&tiqn->tiqn_state_lock);
  88                 }
  89         }
  90         spin_unlock(&tiqn_lock);
  91
  92         return NULL;
  93 }
  94
  95 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
  96 {
  97         spin_lock(&tiqn->tiqn_state_lock);
  98         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
  99                 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
 100                 spin_unlock(&tiqn->tiqn_state_lock);
 101                 return 0;
 102         }
 103         spin_unlock(&tiqn->tiqn_state_lock);
 104
 105         return -1;
 106 }
 107
 108 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
 109 {
 110         spin_lock(&tiqn->tiqn_state_lock);
 111         tiqn->tiqn_access_count--;
 112         spin_unlock(&tiqn->tiqn_state_lock);
 113 }
 114
 115 /*
 116  * Note that IQN formatting is expected to be done in userspace, and
 117  * no explict IQN format checks are done here.
 118  */
 119 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
 120 {
 121         struct iscsi_tiqn *tiqn = NULL;
 122         int ret;
 123
 124         if (strlen(buf) >= ISCSI_IQN_LEN) {
 125                 pr_err("Target IQN exceeds %d bytes\n",
 126                                 ISCSI_IQN_LEN);
 127                 return ERR_PTR(-EINVAL);
 128         }
 129
 130         tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL);
 131         if (!tiqn) {
 132                 pr_err("Unable to allocate struct iscsi_tiqn\n");
 133                 return ERR_PTR(-ENOMEM);
 134         }
 135
 136         sprintf(tiqn->tiqn, "%s", buf);
 137         INIT_LIST_HEAD(&tiqn->tiqn_list);
 138         INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
 139         spin_lock_init(&tiqn->tiqn_state_lock);
 140         spin_lock_init(&tiqn->tiqn_tpg_lock);
 141         spin_lock_init(&tiqn->sess_err_stats.lock);
 142         spin_lock_init(&tiqn->login_stats.lock);
 143         spin_lock_init(&tiqn->logout_stats.lock);
 144
 145         tiqn->tiqn_state = TIQN_STATE_ACTIVE;
 146
 147         idr_preload(GFP_KERNEL);
 148         spin_lock(&tiqn_lock);
 149
 150         ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
 151         if (ret < 0) {
 152                 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
 153                 spin_unlock(&tiqn_lock);
 154                 idr_preload_end();
 155                 kfree(tiqn);
 156                 return ERR_PTR(ret);
 157         }
 158         tiqn->tiqn_index = ret;
 159         list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
 160
 161         spin_unlock(&tiqn_lock);
 162         idr_preload_end();
 163
 164         pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
 165
 166         return tiqn;
 167
 168 }
 169
 170 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
 171 {
 172         /*
 173          * Wait for accesses to said struct iscsi_tiqn to end.
 174          */
 175         spin_lock(&tiqn->tiqn_state_lock);
 176         while (tiqn->tiqn_access_count != 0) {
 177                 spin_unlock(&tiqn->tiqn_state_lock);
 178                 msleep(10);
 179                 spin_lock(&tiqn->tiqn_state_lock);
 180         }
 181         spin_unlock(&tiqn->tiqn_state_lock);
 182 }
 183
 184 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
 185 {
 186         /*
 187          * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
 188          * while holding tiqn->tiqn_state_lock.  This means that all subsequent
 189          * attempts to access this struct iscsi_tiqn will fail from both transport
 190          * fabric and control code paths.
 191          */
 192         if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
 193                 pr_err("iscsit_set_tiqn_shutdown() failed\n");
 194                 return;
 195         }
 196
 197         iscsit_wait_for_tiqn(tiqn);
 198
 199         spin_lock(&tiqn_lock);
 200         list_del(&tiqn->tiqn_list);
 201         idr_remove(&tiqn_idr, tiqn->tiqn_index);
 202         spin_unlock(&tiqn_lock);
 203
 204         pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
 205                         tiqn->tiqn);
 206         kfree(tiqn);
 207 }
 208
 209 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
 210 {
 211         int ret;
 212         /*
 213          * Determine if the network portal is accepting storage traffic.
 214          */
 215         spin_lock_bh(&np->np_thread_lock);
 216         if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 217                 spin_unlock_bh(&np->np_thread_lock);
 218                 return -1;
 219         }
 220         spin_unlock_bh(&np->np_thread_lock);
 221         /*
 222          * Determine if the portal group is accepting storage traffic.
 223          */
 224         spin_lock_bh(&tpg->tpg_state_lock);
 225         if (tpg->tpg_state != TPG_STATE_ACTIVE) {
 226                 spin_unlock_bh(&tpg->tpg_state_lock);
 227                 return -1;
 228         }
 229         spin_unlock_bh(&tpg->tpg_state_lock);
 230
 231         /*
 232          * Here we serialize access across the TIQN+TPG Tuple.
 233          */
 234         ret = down_interruptible(&tpg->np_login_sem);
 235         if ((ret != 0) || signal_pending(current))
 236                 return -1;
 237
 238         spin_lock_bh(&tpg->tpg_state_lock);
 239         if (tpg->tpg_state != TPG_STATE_ACTIVE) {
 240                 spin_unlock_bh(&tpg->tpg_state_lock);
 241                 up(&tpg->np_login_sem);
 242                 return -1;
 243         }
 244         spin_unlock_bh(&tpg->tpg_state_lock);
 245
 246         return 0;
 247 }
 248
 249 void iscsit_login_kref_put(struct kref *kref)
 250 {
 251         struct iscsi_tpg_np *tpg_np = container_of(kref,
 252                                 struct iscsi_tpg_np, tpg_np_kref);
 253
 254         complete(&tpg_np->tpg_np_comp);
 255 }
 256
 257 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg,
 258                        struct iscsi_tpg_np *tpg_np)
 259 {
 260         struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
 261
 262         up(&tpg->np_login_sem);
 263
 264         if (tpg_np)
 265                 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
 266
 267         if (tiqn)
 268                 iscsit_put_tiqn_for_login(tiqn);
 269
 270         return 0;
 271 }
 272
 273 bool iscsit_check_np_match(
 274         struct __kernel_sockaddr_storage *sockaddr,
 275         struct iscsi_np *np,
 276         int network_transport)
 277 {
 278         struct sockaddr_in *sock_in, *sock_in_e;
 279         struct sockaddr_in6 *sock_in6, *sock_in6_e;
 280         bool ip_match = false;
 281         u16 port;
 282
 283         if (sockaddr->ss_family == AF_INET6) {
 284                 sock_in6 = (struct sockaddr_in6 *)sockaddr;
 285                 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
 286
 287                 if (!memcmp(&sock_in6->sin6_addr.in6_u,
 288                             &sock_in6_e->sin6_addr.in6_u,
 289                             sizeof(struct in6_addr)))
 290                         ip_match = true;
 291
 292                 port = ntohs(sock_in6->sin6_port);
 293         } else {
 294                 sock_in = (struct sockaddr_in *)sockaddr;
 295                 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
 296
 297                 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
 298                         ip_match = true;
 299
 300                 port = ntohs(sock_in->sin_port);
 301         }
 302
 303         if ((ip_match == true) && (np->np_port == port) &&
 304             (np->np_network_transport == network_transport))
 305                 return true;
 306
 307         return false;
 308 }
 309
 310 static struct iscsi_np *iscsit_get_np(
 311         struct __kernel_sockaddr_storage *sockaddr,
 312         int network_transport)
 313 {
 314         struct iscsi_np *np;
 315         bool match;
 316
 317         spin_lock_bh(&np_lock);
 318         list_for_each_entry(np, &g_np_list, np_list) {
 319                 spin_lock(&np->np_thread_lock);
 320                 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 321                         spin_unlock(&np->np_thread_lock);
 322                         continue;
 323                 }
 324
 325                 match = iscsit_check_np_match(sockaddr, np, network_transport);
 326                 if (match == true) {
 327                         /*
 328                          * Increment the np_exports reference count now to
 329                          * prevent iscsit_del_np() below from being called
 330                          * while iscsi_tpg_add_network_portal() is called.
 331                          */
 332                         np->np_exports++;
 333                         spin_unlock(&np->np_thread_lock);
 334                         spin_unlock_bh(&np_lock);
 335                         return np;
 336                 }
 337                 spin_unlock(&np->np_thread_lock);
 338         }
 339         spin_unlock_bh(&np_lock);
 340
 341         return NULL;
 342 }
 343
 344 struct iscsi_np *iscsit_add_np(
 345         struct __kernel_sockaddr_storage *sockaddr,
 346         char *ip_str,
 347         int network_transport)
 348 {
 349         struct sockaddr_in *sock_in;
 350         struct sockaddr_in6 *sock_in6;
 351         struct iscsi_np *np;
 352         int ret;
 353         /*
 354          * Locate the existing struct iscsi_np if already active..
 355          */
 356         np = iscsit_get_np(sockaddr, network_transport);
 357         if (np)
 358                 return np;
 359
 360         np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
 361         if (!np) {
 362                 pr_err("Unable to allocate memory for struct iscsi_np\n");
 363                 return ERR_PTR(-ENOMEM);
 364         }
 365
 366         np->np_flags |= NPF_IP_NETWORK;
 367         if (sockaddr->ss_family == AF_INET6) {
 368                 sock_in6 = (struct sockaddr_in6 *)sockaddr;
 369                 snprintf(np->np_ip, IPV6_ADDRESS_SPACE, "%s", ip_str);
 370                 np->np_port = ntohs(sock_in6->sin6_port);
 371         } else {
 372                 sock_in = (struct sockaddr_in *)sockaddr;
 373                 sprintf(np->np_ip, "%s", ip_str);
 374                 np->np_port = ntohs(sock_in->sin_port);
 375         }
 376
 377         np->np_network_transport = network_transport;
 378         spin_lock_init(&np->np_thread_lock);
 379         init_completion(&np->np_restart_comp);
 380         INIT_LIST_HEAD(&np->np_list);
 381
 382         ret = iscsi_target_setup_login_socket(np, sockaddr);
 383         if (ret != 0) {
 384                 kfree(np);
 385                 return ERR_PTR(ret);
 386         }
 387
 388         np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
 389         if (IS_ERR(np->np_thread)) {
 390                 pr_err("Unable to create kthread: iscsi_np\n");
 391                 ret = PTR_ERR(np->np_thread);
 392                 kfree(np);
 393                 return ERR_PTR(ret);
 394         }
 395         /*
 396          * Increment the np_exports reference count now to prevent
 397          * iscsit_del_np() below from being run while a new call to
 398          * iscsi_tpg_add_network_portal() for a matching iscsi_np is
 399          * active.  We don't need to hold np->np_thread_lock at this
 400          * point because iscsi_np has not been added to g_np_list yet.
 401          */
 402         np->np_exports = 1;
 403
 404         spin_lock_bh(&np_lock);
 405         list_add_tail(&np->np_list, &g_np_list);
 406         spin_unlock_bh(&np_lock);
 407
 408         pr_debug("CORE[0] - Added Network Portal: %s:%hu on %s\n",
 409                 np->np_ip, np->np_port, np->np_transport->name);
 410
 411         return np;
 412 }
 413
 414 int iscsit_reset_np_thread(
 415         struct iscsi_np *np,
 416         struct iscsi_tpg_np *tpg_np,
 417         struct iscsi_portal_group *tpg,
 418         bool shutdown)
 419 {
 420         spin_lock_bh(&np->np_thread_lock);
 421         if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
 422                 spin_unlock_bh(&np->np_thread_lock);
 423                 return 0;
 424         }
 425         np->np_thread_state = ISCSI_NP_THREAD_RESET;
 426
 427         if (np->np_thread) {
 428                 spin_unlock_bh(&np->np_thread_lock);
 429                 send_sig(SIGINT, np->np_thread, 1);
 430                 wait_for_completion(&np->np_restart_comp);
 431                 spin_lock_bh(&np->np_thread_lock);
 432         }
 433         spin_unlock_bh(&np->np_thread_lock);
 434
 435         if (tpg_np && shutdown) {
 436                 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
 437
 438                 wait_for_completion(&tpg_np->tpg_np_comp);
 439         }
 440
 441         return 0;
 442 }
 443
 444 static void iscsit_free_np(struct iscsi_np *np)
 445 {
 446         if (np->np_socket)
 447                 sock_release(np->np_socket);
 448 }
 449
 450 int iscsit_del_np(struct iscsi_np *np)
 451 {
 452         spin_lock_bh(&np->np_thread_lock);
 453         np->np_exports--;
 454         if (np->np_exports) {
 455                 spin_unlock_bh(&np->np_thread_lock);
 456                 return 0;
 457         }
 458         np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
 459         spin_unlock_bh(&np->np_thread_lock);
 460
 461         if (np->np_thread) {
 462                 /*
 463                  * We need to send the signal to wakeup Linux/Net
 464                  * which may be sleeping in sock_accept()..
 465                  */
 466                 send_sig(SIGINT, np->np_thread, 1);
 467                 kthread_stop(np->np_thread);
 468         }
 469
 470         np->np_transport->iscsit_free_np(np);
 471
 472         spin_lock_bh(&np_lock);
 473         list_del(&np->np_list);
 474         spin_unlock_bh(&np_lock);
 475
 476         pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n",
 477                 np->np_ip, np->np_port, np->np_transport->name);
 478
 479         iscsit_put_transport(np->np_transport);
 480         kfree(np);
 481         return 0;
 482 }
 483
 484 static int iscsit_immediate_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
 485 static int iscsit_response_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
 486
 487 static int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
 488 {
 489         iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
 490         return 0;
 491 }
 492
 493 static struct iscsit_transport iscsi_target_transport = {
 494         .name                   = "iSCSI/TCP",
 495         .transport_type         = ISCSI_TCP,
 496         .owner                  = NULL,
 497         .iscsit_setup_np        = iscsit_setup_np,
 498         .iscsit_accept_np       = iscsit_accept_np,
 499         .iscsit_free_np         = iscsit_free_np,
 500         .iscsit_get_login_rx    = iscsit_get_login_rx,
 501         .iscsit_put_login_tx    = iscsit_put_login_tx,
 502         .iscsit_get_dataout     = iscsit_build_r2ts_for_cmd,
 503         .iscsit_immediate_queue = iscsit_immediate_queue,
 504         .iscsit_response_queue  = iscsit_response_queue,
 505         .iscsit_queue_data_in   = iscsit_queue_rsp,
 506         .iscsit_queue_status    = iscsit_queue_rsp,
 507 };
 508
 509 static int __init iscsi_target_init_module(void)
 510 {
 511         int ret = 0;
 512
 513         pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
 514
 515         iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
 516         if (!iscsit_global) {
 517                 pr_err("Unable to allocate memory for iscsit_global\n");
 518                 return -1;
 519         }
 520         mutex_init(&auth_id_lock);
 521         spin_lock_init(&sess_idr_lock);
 522         idr_init(&tiqn_idr);
 523         idr_init(&sess_idr);
 524
 525         ret = iscsi_target_register_configfs();
 526         if (ret < 0)
 527                 goto out;
 528
 529         ret = iscsi_thread_set_init();
 530         if (ret < 0)
 531                 goto configfs_out;
 532
 533         if (iscsi_allocate_thread_sets(TARGET_THREAD_SET_COUNT) !=
 534                         TARGET_THREAD_SET_COUNT) {
 535                 pr_err("iscsi_allocate_thread_sets() returned"
 536                         " unexpected value!\n");
 537                 goto ts_out1;
 538         }
 539
 540         lio_qr_cache = kmem_cache_create("lio_qr_cache",
 541                         sizeof(struct iscsi_queue_req),
 542                         __alignof__(struct iscsi_queue_req), 0, NULL);
 543         if (!lio_qr_cache) {
 544                 pr_err("nable to kmem_cache_create() for"
 545                                 " lio_qr_cache\n");
 546                 goto ts_out2;
 547         }
 548
 549         lio_dr_cache = kmem_cache_create("lio_dr_cache",
 550                         sizeof(struct iscsi_datain_req),
 551                         __alignof__(struct iscsi_datain_req), 0, NULL);
 552         if (!lio_dr_cache) {
 553                 pr_err("Unable to kmem_cache_create() for"
 554                                 " lio_dr_cache\n");
 555                 goto qr_out;
 556         }
 557
 558         lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
 559                         sizeof(struct iscsi_ooo_cmdsn),
 560                         __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
 561         if (!lio_ooo_cache) {
 562                 pr_err("Unable to kmem_cache_create() for"
 563                                 " lio_ooo_cache\n");
 564                 goto dr_out;
 565         }
 566
 567         lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
 568                         sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
 569                         0, NULL);
 570         if (!lio_r2t_cache) {
 571                 pr_err("Unable to kmem_cache_create() for"
 572                                 " lio_r2t_cache\n");
 573                 goto ooo_out;
 574         }
 575
 576         iscsit_register_transport(&iscsi_target_transport);
 577
 578         if (iscsit_load_discovery_tpg() < 0)
 579                 goto r2t_out;
 580
 581         return ret;
 582 r2t_out:
 583         kmem_cache_destroy(lio_r2t_cache);
 584 ooo_out:
 585         kmem_cache_destroy(lio_ooo_cache);
 586 dr_out:
 587         kmem_cache_destroy(lio_dr_cache);
 588 qr_out:
 589         kmem_cache_destroy(lio_qr_cache);
 590 ts_out2:
 591         iscsi_deallocate_thread_sets();
 592 ts_out1:
 593         iscsi_thread_set_free();
 594 configfs_out:
 595         iscsi_target_deregister_configfs();
 596 out:
 597         kfree(iscsit_global);
 598         return -ENOMEM;
 599 }
 600
 601 static void __exit iscsi_target_cleanup_module(void)
 602 {
 603         iscsi_deallocate_thread_sets();
 604         iscsi_thread_set_free();
 605         iscsit_release_discovery_tpg();
 606         iscsit_unregister_transport(&iscsi_target_transport);
 607         kmem_cache_destroy(lio_qr_cache);
 608         kmem_cache_destroy(lio_dr_cache);
 609         kmem_cache_destroy(lio_ooo_cache);
 610         kmem_cache_destroy(lio_r2t_cache);
 611
 612         iscsi_target_deregister_configfs();
 613
 614         kfree(iscsit_global);
 615 }
 616
 617 static int iscsit_add_reject(
 618         struct iscsi_conn *conn,
 619         u8 reason,
 620         unsigned char *buf)
 621 {
 622         struct iscsi_cmd *cmd;
 623
 624         cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
 625         if (!cmd)
 626                 return -1;
 627
 628         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 629         cmd->reject_reason = reason;
 630
 631         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 632         if (!cmd->buf_ptr) {
 633                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 634                 iscsit_free_cmd(cmd, false);
 635                 return -1;
 636         }
 637
 638         spin_lock_bh(&conn->cmd_lock);
 639         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 640         spin_unlock_bh(&conn->cmd_lock);
 641
 642         cmd->i_state = ISTATE_SEND_REJECT;
 643         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 644
 645         return -1;
 646 }
 647
 648 static int iscsit_add_reject_from_cmd(
 649         struct iscsi_cmd *cmd,
 650         u8 reason,
 651         bool add_to_conn,
 652         unsigned char *buf)
 653 {
 654         struct iscsi_conn *conn;
 655
 656         if (!cmd->conn) {
 657                 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
 658                                 cmd->init_task_tag);
 659                 return -1;
 660         }
 661         conn = cmd->conn;
 662
 663         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 664         cmd->reject_reason = reason;
 665
 666         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 667         if (!cmd->buf_ptr) {
 668                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 669                 iscsit_free_cmd(cmd, false);
 670                 return -1;
 671         }
 672
 673         if (add_to_conn) {
 674                 spin_lock_bh(&conn->cmd_lock);
 675                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 676                 spin_unlock_bh(&conn->cmd_lock);
 677         }
 678
 679         cmd->i_state = ISTATE_SEND_REJECT;
 680         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 681         /*
 682          * Perform the kref_put now if se_cmd has already been setup by
 683          * scsit_setup_scsi_cmd()
 684          */
 685         if (cmd->se_cmd.se_tfo != NULL) {
 686                 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
 687                 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
 688         }
 689         return -1;
 690 }
 691
 692 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
 693                                  unsigned char *buf)
 694 {
 695         return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
 696 }
 697
 698 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
 699 {
 700         return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
 701 }
 702
 703 /*
 704  * Map some portion of the allocated scatterlist to an iovec, suitable for
 705  * kernel sockets to copy data in/out.
 706  */
 707 static int iscsit_map_iovec(
 708         struct iscsi_cmd *cmd,
 709         struct kvec *iov,
 710         u32 data_offset,
 711         u32 data_length)
 712 {
 713         u32 i = 0;
 714         struct scatterlist *sg;
 715         unsigned int page_off;
 716
 717         /*
 718          * We know each entry in t_data_sg contains a page.
 719          */
 720         sg = &cmd->se_cmd.t_data_sg[data_offset / PAGE_SIZE];
 721         page_off = (data_offset % PAGE_SIZE);
 722
 723         cmd->first_data_sg = sg;
 724         cmd->first_data_sg_off = page_off;
 725
 726         while (data_length) {
 727                 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
 728
 729                 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
 730                 iov[i].iov_len = cur_len;
 731
 732                 data_length -= cur_len;
 733                 page_off = 0;
 734                 sg = sg_next(sg);
 735                 i++;
 736         }
 737
 738         cmd->kmapped_nents = i;
 739
 740         return i;
 741 }
 742
 743 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
 744 {
 745         u32 i;
 746         struct scatterlist *sg;
 747
 748         sg = cmd->first_data_sg;
 749
 750         for (i = 0; i < cmd->kmapped_nents; i++)
 751                 kunmap(sg_page(&sg[i]));
 752 }
 753
 754 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
 755 {
 756         LIST_HEAD(ack_list);
 757         struct iscsi_cmd *cmd, *cmd_p;
 758
 759         conn->exp_statsn = exp_statsn;
 760
 761         if (conn->sess->sess_ops->RDMAExtensions)
 762                 return;
 763
 764         spin_lock_bh(&conn->cmd_lock);
 765         list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
 766                 spin_lock(&cmd->istate_lock);
 767                 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
 768                     iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
 769                         cmd->i_state = ISTATE_REMOVE;
 770                         spin_unlock(&cmd->istate_lock);
 771                         list_move_tail(&cmd->i_conn_node, &ack_list);
 772                         continue;
 773                 }
 774                 spin_unlock(&cmd->istate_lock);
 775         }
 776         spin_unlock_bh(&conn->cmd_lock);
 777
 778         list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
 779                 list_del(&cmd->i_conn_node);
 780                 iscsit_free_cmd(cmd, false);
 781         }
 782 }
 783
 784 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
 785 {
 786         u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
 787
 788         iov_count += ISCSI_IOV_DATA_BUFFER;
 789
 790         cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
 791         if (!cmd->iov_data) {
 792                 pr_err("Unable to allocate cmd->iov_data\n");
 793                 return -ENOMEM;
 794         }
 795
 796         cmd->orig_iov_data_count = iov_count;
 797         return 0;
 798 }
 799
 800 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 801                           unsigned char *buf)
 802 {
 803         int data_direction, payload_length;
 804         struct iscsi_scsi_req *hdr;
 805         int iscsi_task_attr;
 806         int sam_task_attr;
 807
 808         spin_lock_bh(&conn->sess->session_stats_lock);
 809         conn->sess->cmd_pdus++;
 810         if (conn->sess->se_sess->se_node_acl) {
 811                 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
 812                 conn->sess->se_sess->se_node_acl->num_cmds++;
 813                 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
 814         }
 815         spin_unlock_bh(&conn->sess->session_stats_lock);
 816
 817         hdr                     = (struct iscsi_scsi_req *) buf;
 818         payload_length          = ntoh24(hdr->dlength);
 819
 820         /* FIXME; Add checks for AdditionalHeaderSegment */
 821
 822         if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
 823             !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
 824                 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
 825                                 " not set. Bad iSCSI Initiator.\n");
 826                 return iscsit_add_reject_cmd(cmd,
 827                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 828         }
 829
 830         if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
 831              (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
 832                 /*
 833                  * Vmware ESX v3.0 uses a modified Cisco Initiator (v3.4.2)
 834                  * that adds support for RESERVE/RELEASE.  There is a bug
 835                  * add with this new functionality that sets R/W bits when
 836                  * neither CDB carries any READ or WRITE datapayloads.
 837                  */
 838                 if ((hdr->cdb[0] == 0x16) || (hdr->cdb[0] == 0x17)) {
 839                         hdr->flags &= ~ISCSI_FLAG_CMD_READ;
 840                         hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
 841                         goto done;
 842                 }
 843
 844                 pr_err("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
 845                         " set when Expected Data Transfer Length is 0 for"
 846                         " CDB: 0x%02x. Bad iSCSI Initiator.\n", hdr->cdb[0]);
 847                 return iscsit_add_reject_cmd(cmd,
 848                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 849         }
 850 done:
 851
 852         if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
 853             !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
 854                 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
 855                         " MUST be set if Expected Data Transfer Length is not 0."
 856                         " Bad iSCSI Initiator\n");
 857                 return iscsit_add_reject_cmd(cmd,
 858                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 859         }
 860
 861         if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
 862             (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
 863                 pr_err("Bidirectional operations not supported!\n");
 864                 return iscsit_add_reject_cmd(cmd,
 865                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 866         }
 867
 868         if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
 869                 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
 870                                 " Scsi Command PDU.\n");
 871                 return iscsit_add_reject_cmd(cmd,
 872                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 873         }
 874
 875         if (payload_length && !conn->sess->sess_ops->ImmediateData) {
 876                 pr_err("ImmediateData=No but DataSegmentLength=%u,"
 877                         " protocol error.\n", payload_length);
 878                 return iscsit_add_reject_cmd(cmd,
 879                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
 880         }
 881
 882         if ((be32_to_cpu(hdr->data_length) == payload_length) &&
 883             (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
 884                 pr_err("Expected Data Transfer Length and Length of"
 885                         " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
 886                         " bit is not set protocol error\n");
 887                 return iscsit_add_reject_cmd(cmd,
 888                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
 889         }
 890
 891         if (payload_length > be32_to_cpu(hdr->data_length)) {
 892                 pr_err("DataSegmentLength: %u is greater than"
 893                         " EDTL: %u, protocol error.\n", payload_length,
 894                                 hdr->data_length);
 895                 return iscsit_add_reject_cmd(cmd,
 896                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
 897         }
 898
 899         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
 900                 pr_err("DataSegmentLength: %u is greater than"
 901                         " MaxXmitDataSegmentLength: %u, protocol error.\n",
 902                         payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
 903                 return iscsit_add_reject_cmd(cmd,
 904                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
 905         }
 906
 907         if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
 908                 pr_err("DataSegmentLength: %u is greater than"
 909                         " FirstBurstLength: %u, protocol error.\n",
 910                         payload_length, conn->sess->sess_ops->FirstBurstLength);
 911                 return iscsit_add_reject_cmd(cmd,
 912                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 913         }
 914
 915         data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
 916                          (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
 917                           DMA_NONE;
 918
 919         cmd->data_direction = data_direction;
 920         iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
 921         /*
 922          * Figure out the SAM Task Attribute for the incoming SCSI CDB
 923          */
 924         if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
 925             (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
 926                 sam_task_attr = MSG_SIMPLE_TAG;
 927         else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
 928                 sam_task_attr = MSG_ORDERED_TAG;
 929         else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
 930                 sam_task_attr = MSG_HEAD_TAG;
 931         else if (iscsi_task_attr == ISCSI_ATTR_ACA)
 932                 sam_task_attr = MSG_ACA_TAG;
 933         else {
 934                 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
 935                         " MSG_SIMPLE_TAG\n", iscsi_task_attr);
 936                 sam_task_attr = MSG_SIMPLE_TAG;
 937         }
 938
 939         cmd->iscsi_opcode       = ISCSI_OP_SCSI_CMD;
 940         cmd->i_state            = ISTATE_NEW_CMD;
 941         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
 942         cmd->immediate_data     = (payload_length) ? 1 : 0;
 943         cmd->unsolicited_data   = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
 944                                      (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
 945         if (cmd->unsolicited_data)
 946                 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
 947
 948         conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
 949         if (hdr->flags & ISCSI_FLAG_CMD_READ) {
 950                 spin_lock_bh(&conn->sess->ttt_lock);
 951                 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
 952                 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
 953                         cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
 954                 spin_unlock_bh(&conn->sess->ttt_lock);
 955         } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
 956                 cmd->targ_xfer_tag = 0xFFFFFFFF;
 957         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
 958         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
 959         cmd->first_burst_len    = payload_length;
 960
 961         if (!conn->sess->sess_ops->RDMAExtensions &&
 962              cmd->data_direction == DMA_FROM_DEVICE) {
 963                 struct iscsi_datain_req *dr;
 964
 965                 dr = iscsit_allocate_datain_req();
 966                 if (!dr)
 967                         return iscsit_add_reject_cmd(cmd,
 968                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
 969
 970                 iscsit_attach_datain_req(cmd, dr);
 971         }
 972
 973         /*
 974          * Initialize struct se_cmd descriptor from target_core_mod infrastructure
 975          */
 976         transport_init_se_cmd(&cmd->se_cmd, &lio_target_fabric_configfs->tf_ops,
 977                         conn->sess->se_sess, be32_to_cpu(hdr->data_length),
 978                         cmd->data_direction, sam_task_attr,
 979                         cmd->sense_buffer + 2);
 980
 981         pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
 982                 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
 983                 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
 984                 conn->cid);
 985
 986         target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
 987
 988         cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
 989                                                      scsilun_to_int(&hdr->lun));
 990         if (cmd->sense_reason)
 991                 goto attach_cmd;
 992
 993         cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
 994         if (cmd->sense_reason) {
 995                 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
 996                         return iscsit_add_reject_cmd(cmd,
 997                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
 998                 }
 999
1000                 goto attach_cmd;
1001         }
1002
1003         if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1004                 return iscsit_add_reject_cmd(cmd,
1005                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1006         }
1007
1008 attach_cmd:
1009         spin_lock_bh(&conn->cmd_lock);
1010         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1011         spin_unlock_bh(&conn->cmd_lock);
1012         /*
1013          * Check if we need to delay processing because of ALUA
1014          * Active/NonOptimized primary access state..
1015          */
1016         core_alua_check_nonop_delay(&cmd->se_cmd);
1017
1018         return 0;
1019 }
1020 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1021
1022 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1023 {
1024         iscsit_set_dataout_sequence_values(cmd);
1025
1026         spin_lock_bh(&cmd->dataout_timeout_lock);
1027         iscsit_start_dataout_timer(cmd, cmd->conn);
1028         spin_unlock_bh(&cmd->dataout_timeout_lock);
1029 }
1030 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1031
1032 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1033                             struct iscsi_scsi_req *hdr)
1034 {
1035         int cmdsn_ret = 0;
1036         /*
1037          * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1038          * the Immediate Bit is not set, and no Immediate
1039          * Data is attached.
1040          *
1041          * A PDU/CmdSN carrying Immediate Data can only
1042          * be processed after the DataCRC has passed.
1043          * If the DataCRC fails, the CmdSN MUST NOT
1044          * be acknowledged. (See below)
1045          */
1046         if (!cmd->immediate_data) {
1047                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1048                                         (unsigned char *)hdr, hdr->cmdsn);
1049                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1050                         return -1;
1051                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1052                         target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1053                         return 0;
1054                 }
1055         }
1056
1057         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1058
1059         /*
1060          * If no Immediate Data is attached, it's OK to return now.
1061          */
1062         if (!cmd->immediate_data) {
1063                 if (!cmd->sense_reason && cmd->unsolicited_data)
1064                         iscsit_set_unsoliticed_dataout(cmd);
1065                 if (!cmd->sense_reason)
1066                         return 0;
1067
1068                 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1069                 return 0;
1070         }
1071
1072         /*
1073          * Early CHECK_CONDITIONs with ImmediateData never make it to command
1074          * execution.  These exceptions are processed in CmdSN order using
1075          * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1076          */
1077         if (cmd->sense_reason) {
1078                 if (cmd->reject_reason)
1079                         return 0;
1080
1081                 return 1;
1082         }
1083         /*
1084          * Call directly into transport_generic_new_cmd() to perform
1085          * the backend memory allocation.
1086          */
1087         cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1088         if (cmd->sense_reason)
1089                 return 1;
1090
1091         return 0;
1092 }
1093 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1094
1095 static int
1096 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1097                           bool dump_payload)
1098 {
1099         struct iscsi_conn *conn = cmd->conn;
1100         int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1101         /*
1102          * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1103          */
1104         if (dump_payload == true)
1105                 goto after_immediate_data;
1106
1107         immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1108                                         cmd->first_burst_len);
1109 after_immediate_data:
1110         if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1111                 /*
1112                  * A PDU/CmdSN carrying Immediate Data passed
1113                  * DataCRC, check against ExpCmdSN/MaxCmdSN if
1114                  * Immediate Bit is not set.
1115                  */
1116                 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1117                                         (unsigned char *)hdr, hdr->cmdsn);
1118                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1119                         return -1;
1120
1121                 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1122                         int rc;
1123
1124                         rc = iscsit_dump_data_payload(cmd->conn,
1125                                                       cmd->first_burst_len, 1);
1126                         target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1127                         return rc;
1128                 } else if (cmd->unsolicited_data)
1129                         iscsit_set_unsoliticed_dataout(cmd);
1130
1131         } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1132                 /*
1133                  * Immediate Data failed DataCRC and ERL>=1,
1134                  * silently drop this PDU and let the initiator
1135                  * plug the CmdSN gap.
1136                  *
1137                  * FIXME: Send Unsolicited NOPIN with reserved
1138                  * TTT here to help the initiator figure out
1139                  * the missing CmdSN, although they should be
1140                  * intelligent enough to determine the missing
1141                  * CmdSN and issue a retry to plug the sequence.
1142                  */
1143                 cmd->i_state = ISTATE_REMOVE;
1144                 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1145         } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1146                 return -1;
1147
1148         return 0;
1149 }
1150
1151 static int
1152 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1153                            unsigned char *buf)
1154 {
1155         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1156         int rc, immed_data;
1157         bool dump_payload = false;
1158
1159         rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1160         if (rc < 0)
1161                 return 0;
1162         /*
1163          * Allocation iovecs needed for struct socket operations for
1164          * traditional iSCSI block I/O.
1165          */
1166         if (iscsit_allocate_iovecs(cmd) < 0) {
1167                 return iscsit_add_reject_cmd(cmd,
1168                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1169         }
1170         immed_data = cmd->immediate_data;
1171
1172         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1173         if (rc < 0)
1174                 return rc;
1175         else if (rc > 0)
1176                 dump_payload = true;
1177
1178         if (!immed_data)
1179                 return 0;
1180
1181         return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1182 }
1183
1184 static u32 iscsit_do_crypto_hash_sg(
1185         struct hash_desc *hash,
1186         struct iscsi_cmd *cmd,
1187         u32 data_offset,
1188         u32 data_length,
1189         u32 padding,
1190         u8 *pad_bytes)
1191 {
1192         u32 data_crc;
1193         u32 i;
1194         struct scatterlist *sg;
1195         unsigned int page_off;
1196
1197         crypto_hash_init(hash);
1198
1199         sg = cmd->first_data_sg;
1200         page_off = cmd->first_data_sg_off;
1201
1202         i = 0;
1203         while (data_length) {
1204                 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1205
1206                 crypto_hash_update(hash, &sg[i], cur_len);
1207
1208                 data_length -= cur_len;
1209                 page_off = 0;
1210                 i++;
1211         }
1212
1213         if (padding) {
1214                 struct scatterlist pad_sg;
1215
1216                 sg_init_one(&pad_sg, pad_bytes, padding);
1217                 crypto_hash_update(hash, &pad_sg, padding);
1218         }
1219         crypto_hash_final(hash, (u8 *) &data_crc);
1220
1221         return data_crc;
1222 }
1223
1224 static void iscsit_do_crypto_hash_buf(
1225         struct hash_desc *hash,
1226         const void *buf,
1227         u32 payload_length,
1228         u32 padding,
1229         u8 *pad_bytes,
1230         u8 *data_crc)
1231 {
1232         struct scatterlist sg;
1233
1234         crypto_hash_init(hash);
1235
1236         sg_init_one(&sg, buf, payload_length);
1237         crypto_hash_update(hash, &sg, payload_length);
1238
1239         if (padding) {
1240                 sg_init_one(&sg, pad_bytes, padding);
1241                 crypto_hash_update(hash, &sg, padding);
1242         }
1243         crypto_hash_final(hash, data_crc);
1244 }
1245
1246 int
1247 iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf,
1248                           struct iscsi_cmd **out_cmd)
1249 {
1250         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1251         struct iscsi_cmd *cmd = NULL;
1252         struct se_cmd *se_cmd;
1253         u32 payload_length = ntoh24(hdr->dlength);
1254         int rc;
1255
1256         if (!payload_length) {
1257                 pr_err("DataOUT payload is ZERO, protocol error.\n");
1258                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1259                                          buf);
1260         }
1261
1262         /* iSCSI write */
1263         spin_lock_bh(&conn->sess->session_stats_lock);
1264         conn->sess->rx_data_octets += payload_length;
1265         if (conn->sess->se_sess->se_node_acl) {
1266                 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
1267                 conn->sess->se_sess->se_node_acl->write_bytes += payload_length;
1268                 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
1269         }
1270         spin_unlock_bh(&conn->sess->session_stats_lock);
1271
1272         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1273                 pr_err("DataSegmentLength: %u is greater than"
1274                         " MaxXmitDataSegmentLength: %u\n", payload_length,
1275                         conn->conn_ops->MaxXmitDataSegmentLength);
1276                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1277                                          buf);
1278         }
1279
1280         cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1281                         payload_length);
1282         if (!cmd)
1283                 return 0;
1284
1285         pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1286                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1287                 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1288                 payload_length, conn->cid);
1289
1290         if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1291                 pr_err("Command ITT: 0x%08x received DataOUT after"
1292                         " last DataOUT received, dumping payload\n",
1293                         cmd->init_task_tag);
1294                 return iscsit_dump_data_payload(conn, payload_length, 1);
1295         }
1296
1297         if (cmd->data_direction != DMA_TO_DEVICE) {
1298                 pr_err("Command ITT: 0x%08x received DataOUT for a"
1299                         " NON-WRITE command.\n", cmd->init_task_tag);
1300                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
1301         }
1302         se_cmd = &cmd->se_cmd;
1303         iscsit_mod_dataout_timer(cmd);
1304
1305         if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1306                 pr_err("DataOut Offset: %u, Length %u greater than"
1307                         " iSCSI Command EDTL %u, protocol error.\n",
1308                         hdr->offset, payload_length, cmd->se_cmd.data_length);
1309                 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1310         }
1311
1312         if (cmd->unsolicited_data) {
1313                 int dump_unsolicited_data = 0;
1314
1315                 if (conn->sess->sess_ops->InitialR2T) {
1316                         pr_err("Received unexpected unsolicited data"
1317                                 " while InitialR2T=Yes, protocol error.\n");
1318                         transport_send_check_condition_and_sense(&cmd->se_cmd,
1319                                         TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1320                         return -1;
1321                 }
1322                 /*
1323                  * Special case for dealing with Unsolicited DataOUT
1324                  * and Unsupported SAM WRITE Opcodes and SE resource allocation
1325                  * failures;
1326                  */
1327
1328                 /* Something's amiss if we're not in WRITE_PENDING state... */
1329                 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1330                 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1331                         dump_unsolicited_data = 1;
1332
1333                 if (dump_unsolicited_data) {
1334                         /*
1335                          * Check if a delayed TASK_ABORTED status needs to
1336                          * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1337                          * received with the unsolicitied data out.
1338                          */
1339                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1340                                 iscsit_stop_dataout_timer(cmd);
1341
1342                         transport_check_aborted_status(se_cmd,
1343                                         (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1344                         return iscsit_dump_data_payload(conn, payload_length, 1);
1345                 }
1346         } else {
1347                 /*
1348                  * For the normal solicited data path:
1349                  *
1350                  * Check for a delayed TASK_ABORTED status and dump any
1351                  * incoming data out payload if one exists.  Also, when the
1352                  * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1353                  * data out sequence, we decrement outstanding_r2ts.  Once
1354                  * outstanding_r2ts reaches zero, go ahead and send the delayed
1355                  * TASK_ABORTED status.
1356                  */
1357                 if (se_cmd->transport_state & CMD_T_ABORTED) {
1358                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1359                                 if (--cmd->outstanding_r2ts < 1) {
1360                                         iscsit_stop_dataout_timer(cmd);
1361                                         transport_check_aborted_status(
1362                                                         se_cmd, 1);
1363                                 }
1364
1365                         return iscsit_dump_data_payload(conn, payload_length, 1);
1366                 }
1367         }
1368         /*
1369          * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1370          * within-command recovery checks before receiving the payload.
1371          */
1372         rc = iscsit_check_pre_dataout(cmd, buf);
1373         if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1374                 return 0;
1375         else if (rc == DATAOUT_CANNOT_RECOVER)
1376                 return -1;
1377
1378         *out_cmd = cmd;
1379         return 0;
1380 }
1381 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1382
1383 static int
1384 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1385                    struct iscsi_data *hdr)
1386 {
1387         struct kvec *iov;
1388         u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1389         u32 payload_length = ntoh24(hdr->dlength);
1390         int iov_ret, data_crc_failed = 0;
1391
1392         rx_size += payload_length;
1393         iov = &cmd->iov_data[0];
1394
1395         iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1396                                    payload_length);
1397         if (iov_ret < 0)
1398                 return -1;
1399
1400         iov_count += iov_ret;
1401
1402         padding = ((-payload_length) & 3);
1403         if (padding != 0) {
1404                 iov[iov_count].iov_base = cmd->pad_bytes;
1405                 iov[iov_count++].iov_len = padding;
1406                 rx_size += padding;
1407                 pr_debug("Receiving %u padding bytes.\n", padding);
1408         }
1409
1410         if (conn->conn_ops->DataDigest) {
1411                 iov[iov_count].iov_base = &checksum;
1412                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1413                 rx_size += ISCSI_CRC_LEN;
1414         }
1415
1416         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1417
1418         iscsit_unmap_iovec(cmd);
1419
1420         if (rx_got != rx_size)
1421                 return -1;
1422
1423         if (conn->conn_ops->DataDigest) {
1424                 u32 data_crc;
1425
1426                 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
1427                                                     be32_to_cpu(hdr->offset),
1428                                                     payload_length, padding,
1429                                                     cmd->pad_bytes);
1430
1431                 if (checksum != data_crc) {
1432                         pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1433                                 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1434                                 " does not match computed 0x%08x\n",
1435                                 hdr->itt, hdr->offset, payload_length,
1436                                 hdr->datasn, checksum, data_crc);
1437                         data_crc_failed = 1;
1438                 } else {
1439                         pr_debug("Got CRC32C DataDigest 0x%08x for"
1440                                 " %u bytes of Data Out\n", checksum,
1441                                 payload_length);
1442                 }
1443         }
1444
1445         return data_crc_failed;
1446 }
1447
1448 int
1449 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1450                              bool data_crc_failed)
1451 {
1452         struct iscsi_conn *conn = cmd->conn;
1453         int rc, ooo_cmdsn;
1454         /*
1455          * Increment post receive data and CRC values or perform
1456          * within-command recovery.
1457          */
1458         rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1459         if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1460                 return 0;
1461         else if (rc == DATAOUT_SEND_R2T) {
1462                 iscsit_set_dataout_sequence_values(cmd);
1463                 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1464         } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1465                 /*
1466                  * Handle extra special case for out of order
1467                  * Unsolicited Data Out.
1468                  */
1469                 spin_lock_bh(&cmd->istate_lock);
1470                 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1471                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1472                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1473                 spin_unlock_bh(&cmd->istate_lock);
1474
1475                 iscsit_stop_dataout_timer(cmd);
1476                 if (ooo_cmdsn)
1477                         return 0;
1478                 target_execute_cmd(&cmd->se_cmd);
1479                 return 0;
1480         } else /* DATAOUT_CANNOT_RECOVER */
1481                 return -1;
1482
1483         return 0;
1484 }
1485 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1486
1487 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1488 {
1489         struct iscsi_cmd *cmd;
1490         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1491         int rc;
1492         bool data_crc_failed = false;
1493
1494         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1495         if (rc < 0)
1496                 return 0;
1497         else if (!cmd)
1498                 return 0;
1499
1500         rc = iscsit_get_dataout(conn, cmd, hdr);
1501         if (rc < 0)
1502                 return rc;
1503         else if (rc > 0)
1504                 data_crc_failed = true;
1505
1506         return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1507 }
1508
1509 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1510                          struct iscsi_nopout *hdr)
1511 {
1512         u32 payload_length = ntoh24(hdr->dlength);
1513
1514         if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1515                 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1516                         " not set, protocol error.\n");
1517                 if (!cmd)
1518                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1519                                                  (unsigned char *)hdr);
1520
1521                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1522                                          (unsigned char *)hdr);
1523         }
1524
1525         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1526                 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1527                         " greater than MaxXmitDataSegmentLength: %u, protocol"
1528                         " error.\n", payload_length,
1529                         conn->conn_ops->MaxXmitDataSegmentLength);
1530                 if (!cmd)
1531                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1532                                                  (unsigned char *)hdr);
1533
1534                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1535                                          (unsigned char *)hdr);
1536         }
1537
1538         pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1539                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1540                 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1541                 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1542                 payload_length);
1543         /*
1544          * This is not a response to a Unsolicited NopIN, which means
1545          * it can either be a NOPOUT ping request (with a valid ITT),
1546          * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1547          * Either way, make sure we allocate an struct iscsi_cmd, as both
1548          * can contain ping data.
1549          */
1550         if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1551                 cmd->iscsi_opcode       = ISCSI_OP_NOOP_OUT;
1552                 cmd->i_state            = ISTATE_SEND_NOPIN;
1553                 cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1554                                                 1 : 0);
1555                 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1556                 cmd->targ_xfer_tag      = 0xFFFFFFFF;
1557                 cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1558                 cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1559                 cmd->data_direction     = DMA_NONE;
1560         }
1561
1562         return 0;
1563 }
1564 EXPORT_SYMBOL(iscsit_setup_nop_out);
1565
1566 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1567                            struct iscsi_nopout *hdr)
1568 {
1569         struct iscsi_cmd *cmd_p = NULL;
1570         int cmdsn_ret = 0;
1571         /*
1572          * Initiator is expecting a NopIN ping reply..
1573          */
1574         if (hdr->itt != RESERVED_ITT) {
1575                 BUG_ON(!cmd);
1576
1577                 spin_lock_bh(&conn->cmd_lock);
1578                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1579                 spin_unlock_bh(&conn->cmd_lock);
1580
1581                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1582
1583                 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1584                         iscsit_add_cmd_to_response_queue(cmd, conn,
1585                                                          cmd->i_state);
1586                         return 0;
1587                 }
1588
1589                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1590                                 (unsigned char *)hdr, hdr->cmdsn);
1591                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1592                         return 0;
1593                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1594                         return -1;
1595
1596                 return 0;
1597         }
1598         /*
1599          * This was a response to a unsolicited NOPIN ping.
1600          */
1601         if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1602                 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1603                 if (!cmd_p)
1604                         return -EINVAL;
1605
1606                 iscsit_stop_nopin_response_timer(conn);
1607
1608                 cmd_p->i_state = ISTATE_REMOVE;
1609                 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1610
1611                 iscsit_start_nopin_timer(conn);
1612                 return 0;
1613         }
1614         /*
1615          * Otherwise, initiator is not expecting a NOPIN is response.
1616          * Just ignore for now.
1617          */
1618         return 0;
1619 }
1620 EXPORT_SYMBOL(iscsit_process_nop_out);
1621
1622 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1623                                  unsigned char *buf)
1624 {
1625         unsigned char *ping_data = NULL;
1626         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1627         struct kvec *iov = NULL;
1628         u32 payload_length = ntoh24(hdr->dlength);
1629         int ret;
1630
1631         ret = iscsit_setup_nop_out(conn, cmd, hdr);
1632         if (ret < 0)
1633                 return 0;
1634         /*
1635          * Handle NOP-OUT payload for traditional iSCSI sockets
1636          */
1637         if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1638                 u32 checksum, data_crc, padding = 0;
1639                 int niov = 0, rx_got, rx_size = payload_length;
1640
1641                 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1642                 if (!ping_data) {
1643                         pr_err("Unable to allocate memory for"
1644                                 " NOPOUT ping data.\n");
1645                         ret = -1;
1646                         goto out;
1647                 }
1648
1649                 iov = &cmd->iov_misc[0];
1650                 iov[niov].iov_base      = ping_data;
1651                 iov[niov++].iov_len     = payload_length;
1652
1653                 padding = ((-payload_length) & 3);
1654                 if (padding != 0) {
1655                         pr_debug("Receiving %u additional bytes"
1656                                 " for padding.\n", padding);
1657                         iov[niov].iov_base      = &cmd->pad_bytes;
1658                         iov[niov++].iov_len     = padding;
1659                         rx_size += padding;
1660                 }
1661                 if (conn->conn_ops->DataDigest) {
1662                         iov[niov].iov_base      = &checksum;
1663                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
1664                         rx_size += ISCSI_CRC_LEN;
1665                 }
1666
1667                 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1668                 if (rx_got != rx_size) {
1669                         ret = -1;
1670                         goto out;
1671                 }
1672
1673                 if (conn->conn_ops->DataDigest) {
1674                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1675                                         ping_data, payload_length,
1676                                         padding, cmd->pad_bytes,
1677                                         (u8 *)&data_crc);
1678
1679                         if (checksum != data_crc) {
1680                                 pr_err("Ping data CRC32C DataDigest"
1681                                 " 0x%08x does not match computed 0x%08x\n",
1682                                         checksum, data_crc);
1683                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1684                                         pr_err("Unable to recover from"
1685                                         " NOPOUT Ping DataCRC failure while in"
1686                                                 " ERL=0.\n");
1687                                         ret = -1;
1688                                         goto out;
1689                                 } else {
1690                                         /*
1691                                          * Silently drop this PDU and let the
1692                                          * initiator plug the CmdSN gap.
1693                                          */
1694                                         pr_debug("Dropping NOPOUT"
1695                                         " Command CmdSN: 0x%08x due to"
1696                                         " DataCRC error.\n", hdr->cmdsn);
1697                                         ret = 0;
1698                                         goto out;
1699                                 }
1700                         } else {
1701                                 pr_debug("Got CRC32C DataDigest"
1702                                 " 0x%08x for %u bytes of ping data.\n",
1703                                         checksum, payload_length);
1704                         }
1705                 }
1706
1707                 ping_data[payload_length] = '\0';
1708                 /*
1709                  * Attach ping data to struct iscsi_cmd->buf_ptr.
1710                  */
1711                 cmd->buf_ptr = ping_data;
1712                 cmd->buf_ptr_size = payload_length;
1713
1714                 pr_debug("Got %u bytes of NOPOUT ping"
1715                         " data.\n", payload_length);
1716                 pr_debug("Ping Data: \"%s\"\n", ping_data);
1717         }
1718
1719         return iscsit_process_nop_out(conn, cmd, hdr);
1720 out:
1721         if (cmd)
1722                 iscsit_free_cmd(cmd, false);
1723
1724         kfree(ping_data);
1725         return ret;
1726 }
1727
1728 int
1729 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1730                            unsigned char *buf)
1731 {
1732         struct se_tmr_req *se_tmr;
1733         struct iscsi_tmr_req *tmr_req;
1734         struct iscsi_tm *hdr;
1735         int out_of_order_cmdsn = 0, ret;
1736         bool sess_ref = false;
1737         u8 function;
1738
1739         hdr                     = (struct iscsi_tm *) buf;
1740         hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1741         function = hdr->flags;
1742
1743         pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1744                 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1745                 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1746                 hdr->rtt, hdr->refcmdsn, conn->cid);
1747
1748         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1749             ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1750              hdr->rtt != RESERVED_ITT)) {
1751                 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1752                 hdr->rtt = RESERVED_ITT;
1753         }
1754
1755         if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1756                         !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1757                 pr_err("Task Management Request TASK_REASSIGN not"
1758                         " issued as immediate command, bad iSCSI Initiator"
1759                                 "implementation\n");
1760                 return iscsit_add_reject_cmd(cmd,
1761                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1762         }
1763         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1764             be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1765                 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1766
1767         cmd->data_direction = DMA_NONE;
1768
1769         cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1770         if (!cmd->tmr_req) {
1771                 pr_err("Unable to allocate memory for"
1772                         " Task Management command!\n");
1773                 return iscsit_add_reject_cmd(cmd,
1774                                              ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1775                                              buf);
1776         }
1777
1778         /*
1779          * TASK_REASSIGN for ERL=2 / connection stays inside of
1780          * LIO-Target $FABRIC_MOD
1781          */
1782         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1783
1784                 u8 tcm_function;
1785                 int ret;
1786
1787                 transport_init_se_cmd(&cmd->se_cmd,
1788                                       &lio_target_fabric_configfs->tf_ops,
1789                                       conn->sess->se_sess, 0, DMA_NONE,
1790                                       MSG_SIMPLE_TAG, cmd->sense_buffer + 2);
1791
1792                 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
1793                 sess_ref = true;
1794
1795                 switch (function) {
1796                 case ISCSI_TM_FUNC_ABORT_TASK:
1797                         tcm_function = TMR_ABORT_TASK;
1798                         break;
1799                 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1800                         tcm_function = TMR_ABORT_TASK_SET;
1801                         break;
1802                 case ISCSI_TM_FUNC_CLEAR_ACA:
1803                         tcm_function = TMR_CLEAR_ACA;
1804                         break;
1805                 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1806                         tcm_function = TMR_CLEAR_TASK_SET;
1807                         break;
1808                 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1809                         tcm_function = TMR_LUN_RESET;
1810                         break;
1811                 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1812                         tcm_function = TMR_TARGET_WARM_RESET;
1813                         break;
1814                 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1815                         tcm_function = TMR_TARGET_COLD_RESET;
1816                         break;
1817                 default:
1818                         pr_err("Unknown iSCSI TMR Function:"
1819                                " 0x%02x\n", function);
1820                         return iscsit_add_reject_cmd(cmd,
1821                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1822                 }
1823
1824                 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req,
1825                                          tcm_function, GFP_KERNEL);
1826                 if (ret < 0)
1827                         return iscsit_add_reject_cmd(cmd,
1828                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1829
1830                 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
1831         }
1832
1833         cmd->iscsi_opcode       = ISCSI_OP_SCSI_TMFUNC;
1834         cmd->i_state            = ISTATE_SEND_TASKMGTRSP;
1835         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1836         cmd->init_task_tag      = hdr->itt;
1837         cmd->targ_xfer_tag      = 0xFFFFFFFF;
1838         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1839         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1840         se_tmr                  = cmd->se_cmd.se_tmr_req;
1841         tmr_req                 = cmd->tmr_req;
1842         /*
1843          * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1844          */
1845         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1846                 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
1847                                                scsilun_to_int(&hdr->lun));
1848                 if (ret < 0) {
1849                         se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1850                         goto attach;
1851                 }
1852         }
1853
1854         switch (function) {
1855         case ISCSI_TM_FUNC_ABORT_TASK:
1856                 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
1857                 if (se_tmr->response)
1858                         goto attach;
1859                 break;
1860         case ISCSI_TM_FUNC_ABORT_TASK_SET:
1861         case ISCSI_TM_FUNC_CLEAR_ACA:
1862         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1863         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1864                 break;
1865         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1866                 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
1867                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1868                         goto attach;
1869                 }
1870                 break;
1871         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1872                 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
1873                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1874                         goto attach;
1875                 }
1876                 break;
1877         case ISCSI_TM_FUNC_TASK_REASSIGN:
1878                 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1879                 /*
1880                  * Perform sanity checks on the ExpDataSN only if the
1881                  * TASK_REASSIGN was successful.
1882                  */
1883                 if (se_tmr->response)
1884                         break;
1885
1886                 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1887                         return iscsit_add_reject_cmd(cmd,
1888                                         ISCSI_REASON_BOOKMARK_INVALID, buf);
1889                 break;
1890         default:
1891                 pr_err("Unknown TMR function: 0x%02x, protocol"
1892                         " error.\n", function);
1893                 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1894                 goto attach;
1895         }
1896
1897         if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1898             (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1899                 se_tmr->call_transport = 1;
1900 attach:
1901         spin_lock_bh(&conn->cmd_lock);
1902         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1903         spin_unlock_bh(&conn->cmd_lock);
1904
1905         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1906                 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1907                 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1908                         out_of_order_cmdsn = 1;
1909                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1910                         return 0;
1911                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1912                         return -1;
1913         }
1914         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1915
1916         if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
1917                 return 0;
1918         /*
1919          * Found the referenced task, send to transport for processing.
1920          */
1921         if (se_tmr->call_transport)
1922                 return transport_generic_handle_tmr(&cmd->se_cmd);
1923
1924         /*
1925          * Could not find the referenced LUN, task, or Task Management
1926          * command not authorized or supported.  Change state and
1927          * let the tx_thread send the response.
1928          *
1929          * For connection recovery, this is also the default action for
1930          * TMR TASK_REASSIGN.
1931          */
1932         if (sess_ref) {
1933                 pr_debug("Handle TMR, using sess_ref=true check\n");
1934                 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1935         }
1936
1937         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1938         return 0;
1939 }
1940 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
1941
1942 /* #warning FIXME: Support Text Command parameters besides SendTargets */
1943 int
1944 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1945                       struct iscsi_text *hdr)
1946 {
1947         u32 payload_length = ntoh24(hdr->dlength);
1948
1949         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1950                 pr_err("Unable to accept text parameter length: %u"
1951                         "greater than MaxXmitDataSegmentLength %u.\n",
1952                        payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1953                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1954                                          (unsigned char *)hdr);
1955         }
1956
1957         pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1958                 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1959                 hdr->exp_statsn, payload_length);
1960
1961         cmd->iscsi_opcode       = ISCSI_OP_TEXT;
1962         cmd->i_state            = ISTATE_SEND_TEXTRSP;
1963         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1964         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
1965         cmd->targ_xfer_tag      = 0xFFFFFFFF;
1966         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1967         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1968         cmd->data_direction     = DMA_NONE;
1969
1970         return 0;
1971 }
1972 EXPORT_SYMBOL(iscsit_setup_text_cmd);
1973
1974 int
1975 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1976                         struct iscsi_text *hdr)
1977 {
1978         unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
1979         int cmdsn_ret;
1980
1981         if (!text_in) {
1982                 pr_err("Unable to locate text_in buffer for sendtargets"
1983                        " discovery\n");
1984                 goto reject;
1985         }
1986         if (strncmp("SendTargets", text_in, 11) != 0) {
1987                 pr_err("Received Text Data that is not"
1988                         " SendTargets, cannot continue.\n");
1989                 goto reject;
1990         }
1991         text_ptr = strchr(text_in, '=');
1992         if (!text_ptr) {
1993                 pr_err("No \"=\" separator found in Text Data,"
1994                         "  cannot continue.\n");
1995                 goto reject;
1996         }
1997         if (!strncmp("=All", text_ptr, 4)) {
1998                 cmd->cmd_flags |= IFC_SENDTARGETS_ALL;
1999         } else if (!strncmp("=iqn.", text_ptr, 5) ||
2000                    !strncmp("=eui.", text_ptr, 5)) {
2001                 cmd->cmd_flags |= IFC_SENDTARGETS_SINGLE;
2002         } else {
2003                 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2004                 goto reject;
2005         }
2006
2007         spin_lock_bh(&conn->cmd_lock);
2008         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2009         spin_unlock_bh(&conn->cmd_lock);
2010
2011         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2012
2013         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2014                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2015                                 (unsigned char *)hdr, hdr->cmdsn);
2016                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2017                         return -1;
2018
2019                 return 0;
2020         }
2021
2022         return iscsit_execute_cmd(cmd, 0);
2023
2024 reject:
2025         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2026                                  (unsigned char *)hdr);
2027 }
2028 EXPORT_SYMBOL(iscsit_process_text_cmd);
2029
2030 static int
2031 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2032                        unsigned char *buf)
2033 {
2034         struct iscsi_text *hdr = (struct iscsi_text *)buf;
2035         char *text_in = NULL;
2036         u32 payload_length = ntoh24(hdr->dlength);
2037         int rx_size, rc;
2038
2039         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2040         if (rc < 0)
2041                 return 0;
2042
2043         rx_size = payload_length;
2044         if (payload_length) {
2045                 u32 checksum = 0, data_crc = 0;
2046                 u32 padding = 0, pad_bytes = 0;
2047                 int niov = 0, rx_got;
2048                 struct kvec iov[3];
2049
2050                 text_in = kzalloc(payload_length, GFP_KERNEL);
2051                 if (!text_in) {
2052                         pr_err("Unable to allocate memory for"
2053                                 " incoming text parameters\n");
2054                         goto reject;
2055                 }
2056                 cmd->text_in_ptr = text_in;
2057
2058                 memset(iov, 0, 3 * sizeof(struct kvec));
2059                 iov[niov].iov_base      = text_in;
2060                 iov[niov++].iov_len     = payload_length;
2061
2062                 padding = ((-payload_length) & 3);
2063                 if (padding != 0) {
2064                         iov[niov].iov_base = &pad_bytes;
2065                         iov[niov++].iov_len  = padding;
2066                         rx_size += padding;
2067                         pr_debug("Receiving %u additional bytes"
2068                                         " for padding.\n", padding);
2069                 }
2070                 if (conn->conn_ops->DataDigest) {
2071                         iov[niov].iov_base      = &checksum;
2072                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
2073                         rx_size += ISCSI_CRC_LEN;
2074                 }
2075
2076                 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2077                 if (rx_got != rx_size)
2078                         goto reject;
2079
2080                 if (conn->conn_ops->DataDigest) {
2081                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
2082                                         text_in, payload_length,
2083                                         padding, (u8 *)&pad_bytes,
2084                                         (u8 *)&data_crc);
2085
2086                         if (checksum != data_crc) {
2087                                 pr_err("Text data CRC32C DataDigest"
2088                                         " 0x%08x does not match computed"
2089                                         " 0x%08x\n", checksum, data_crc);
2090                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2091                                         pr_err("Unable to recover from"
2092                                         " Text Data digest failure while in"
2093                                                 " ERL=0.\n");
2094                                         goto reject;
2095                                 } else {
2096                                         /*
2097                                          * Silently drop this PDU and let the
2098                                          * initiator plug the CmdSN gap.
2099                                          */
2100                                         pr_debug("Dropping Text"
2101                                         " Command CmdSN: 0x%08x due to"
2102                                         " DataCRC error.\n", hdr->cmdsn);
2103                                         kfree(text_in);
2104                                         return 0;
2105                                 }
2106                         } else {
2107                                 pr_debug("Got CRC32C DataDigest"
2108                                         " 0x%08x for %u bytes of text data.\n",
2109                                                 checksum, payload_length);
2110                         }
2111                 }
2112                 text_in[payload_length - 1] = '\0';
2113                 pr_debug("Successfully read %d bytes of text"
2114                                 " data.\n", payload_length);
2115         }
2116
2117         return iscsit_process_text_cmd(conn, cmd, hdr);
2118
2119 reject:
2120         kfree(cmd->text_in_ptr);
2121         cmd->text_in_ptr = NULL;
2122         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2123 }
2124 EXPORT_SYMBOL(iscsit_handle_text_cmd);
2125
2126 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2127 {
2128         struct iscsi_conn *conn_p;
2129         struct iscsi_session *sess = conn->sess;
2130
2131         pr_debug("Received logout request CLOSESESSION on CID: %hu"
2132                 " for SID: %u.\n", conn->cid, conn->sess->sid);
2133
2134         atomic_set(&sess->session_logout, 1);
2135         atomic_set(&conn->conn_logout_remove, 1);
2136         conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2137
2138         iscsit_inc_conn_usage_count(conn);
2139         iscsit_inc_session_usage_count(sess);
2140
2141         spin_lock_bh(&sess->conn_lock);
2142         list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2143                 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2144                         continue;
2145
2146                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2147                 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2148         }
2149         spin_unlock_bh(&sess->conn_lock);
2150
2151         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2152
2153         return 0;
2154 }
2155
2156 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2157 {
2158         struct iscsi_conn *l_conn;
2159         struct iscsi_session *sess = conn->sess;
2160
2161         pr_debug("Received logout request CLOSECONNECTION for CID:"
2162                 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2163
2164         /*
2165          * A Logout Request with a CLOSECONNECTION reason code for a CID
2166          * can arrive on a connection with a differing CID.
2167          */
2168         if (conn->cid == cmd->logout_cid) {
2169                 spin_lock_bh(&conn->state_lock);
2170                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2171                 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2172
2173                 atomic_set(&conn->conn_logout_remove, 1);
2174                 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2175                 iscsit_inc_conn_usage_count(conn);
2176
2177                 spin_unlock_bh(&conn->state_lock);
2178         } else {
2179                 /*
2180                  * Handle all different cid CLOSECONNECTION requests in
2181                  * iscsit_logout_post_handler_diffcid() as to give enough
2182                  * time for any non immediate command's CmdSN to be
2183                  * acknowledged on the connection in question.
2184                  *
2185                  * Here we simply make sure the CID is still around.
2186                  */
2187                 l_conn = iscsit_get_conn_from_cid(sess,
2188                                 cmd->logout_cid);
2189                 if (!l_conn) {
2190                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2191                         iscsit_add_cmd_to_response_queue(cmd, conn,
2192                                         cmd->i_state);
2193                         return 0;
2194                 }
2195
2196                 iscsit_dec_conn_usage_count(l_conn);
2197         }
2198
2199         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2200
2201         return 0;
2202 }
2203
2204 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2205 {
2206         struct iscsi_session *sess = conn->sess;
2207
2208         pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2209                 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2210
2211         if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2212                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2213                         " while ERL!=2.\n");
2214                 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2215                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2216                 return 0;
2217         }
2218
2219         if (conn->cid == cmd->logout_cid) {
2220                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2221                         " with CID: %hu on CID: %hu, implementation error.\n",
2222                                 cmd->logout_cid, conn->cid);
2223                 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2224                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2225                 return 0;
2226         }
2227
2228         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2229
2230         return 0;
2231 }
2232
2233 int
2234 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2235                         unsigned char *buf)
2236 {
2237         int cmdsn_ret, logout_remove = 0;
2238         u8 reason_code = 0;
2239         struct iscsi_logout *hdr;
2240         struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2241
2242         hdr                     = (struct iscsi_logout *) buf;
2243         reason_code             = (hdr->flags & 0x7f);
2244
2245         if (tiqn) {
2246                 spin_lock(&tiqn->logout_stats.lock);
2247                 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2248                         tiqn->logout_stats.normal_logouts++;
2249                 else
2250                         tiqn->logout_stats.abnormal_logouts++;
2251                 spin_unlock(&tiqn->logout_stats.lock);
2252         }
2253
2254         pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2255                 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2256                 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2257                 hdr->cid, conn->cid);
2258
2259         if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2260                 pr_err("Received logout request on connection that"
2261                         " is not in logged in state, ignoring request.\n");
2262                 iscsit_free_cmd(cmd, false);
2263                 return 0;
2264         }
2265
2266         cmd->iscsi_opcode       = ISCSI_OP_LOGOUT;
2267         cmd->i_state            = ISTATE_SEND_LOGOUTRSP;
2268         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2269         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2270         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2271         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2272         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2273         cmd->logout_cid         = be16_to_cpu(hdr->cid);
2274         cmd->logout_reason      = reason_code;
2275         cmd->data_direction     = DMA_NONE;
2276
2277         /*
2278          * We need to sleep in these cases (by returning 1) until the Logout
2279          * Response gets sent in the tx thread.
2280          */
2281         if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2282            ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2283             be16_to_cpu(hdr->cid) == conn->cid))
2284                 logout_remove = 1;
2285
2286         spin_lock_bh(&conn->cmd_lock);
2287         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2288         spin_unlock_bh(&conn->cmd_lock);
2289
2290         if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2291                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2292
2293         /*
2294          * Immediate commands are executed, well, immediately.
2295          * Non-Immediate Logout Commands are executed in CmdSN order.
2296          */
2297         if (cmd->immediate_cmd) {
2298                 int ret = iscsit_execute_cmd(cmd, 0);
2299
2300                 if (ret < 0)
2301                         return ret;
2302         } else {
2303                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2304                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2305                         logout_remove = 0;
2306                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2307                         return -1;
2308         }
2309
2310         return logout_remove;
2311 }
2312 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2313
2314 static int iscsit_handle_snack(
2315         struct iscsi_conn *conn,
2316         unsigned char *buf)
2317 {
2318         struct iscsi_snack *hdr;
2319
2320         hdr                     = (struct iscsi_snack *) buf;
2321         hdr->flags              &= ~ISCSI_FLAG_CMD_FINAL;
2322
2323         pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2324                 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2325                 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2326                         hdr->begrun, hdr->runlength, conn->cid);
2327
2328         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2329                 pr_err("Initiator sent SNACK request while in"
2330                         " ErrorRecoveryLevel=0.\n");
2331                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2332                                          buf);
2333         }
2334         /*
2335          * SNACK_DATA and SNACK_R2T are both 0,  so check which function to
2336          * call from inside iscsi_send_recovery_datain_or_r2t().
2337          */
2338         switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2339         case 0:
2340                 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2341                         hdr->itt,
2342                         be32_to_cpu(hdr->ttt),
2343                         be32_to_cpu(hdr->begrun),
2344                         be32_to_cpu(hdr->runlength));
2345         case ISCSI_FLAG_SNACK_TYPE_STATUS:
2346                 return iscsit_handle_status_snack(conn, hdr->itt,
2347                         be32_to_cpu(hdr->ttt),
2348                         be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2349         case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2350                 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2351                         be32_to_cpu(hdr->begrun),
2352                         be32_to_cpu(hdr->runlength));
2353         case ISCSI_FLAG_SNACK_TYPE_RDATA:
2354                 /* FIXME: Support R-Data SNACK */
2355                 pr_err("R-Data SNACK Not Supported.\n");
2356                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2357                                          buf);
2358         default:
2359                 pr_err("Unknown SNACK type 0x%02x, protocol"
2360                         " error.\n", hdr->flags & 0x0f);
2361                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2362                                          buf);
2363         }
2364
2365         return 0;
2366 }
2367
2368 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2369 {
2370         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2371             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2372                 wait_for_completion_interruptible_timeout(
2373                                         &conn->rx_half_close_comp,
2374                                         ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2375         }
2376 }
2377
2378 static int iscsit_handle_immediate_data(
2379         struct iscsi_cmd *cmd,
2380         struct iscsi_scsi_req *hdr,
2381         u32 length)
2382 {
2383         int iov_ret, rx_got = 0, rx_size = 0;
2384         u32 checksum, iov_count = 0, padding = 0;
2385         struct iscsi_conn *conn = cmd->conn;
2386         struct kvec *iov;
2387
2388         iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2389         if (iov_ret < 0)
2390                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2391
2392         rx_size = length;
2393         iov_count = iov_ret;
2394         iov = &cmd->iov_data[0];
2395
2396         padding = ((-length) & 3);
2397         if (padding != 0) {
2398                 iov[iov_count].iov_base = cmd->pad_bytes;
2399                 iov[iov_count++].iov_len = padding;
2400                 rx_size += padding;
2401         }
2402
2403         if (conn->conn_ops->DataDigest) {
2404                 iov[iov_count].iov_base         = &checksum;
2405                 iov[iov_count++].iov_len        = ISCSI_CRC_LEN;
2406                 rx_size += ISCSI_CRC_LEN;
2407         }
2408
2409         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2410
2411         iscsit_unmap_iovec(cmd);
2412
2413         if (rx_got != rx_size) {
2414                 iscsit_rx_thread_wait_for_tcp(conn);
2415                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2416         }
2417
2418         if (conn->conn_ops->DataDigest) {
2419                 u32 data_crc;
2420
2421                 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2422                                                     cmd->write_data_done, length, padding,
2423                                                     cmd->pad_bytes);
2424
2425                 if (checksum != data_crc) {
2426                         pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2427                                 " does not match computed 0x%08x\n", checksum,
2428                                 data_crc);
2429
2430                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2431                                 pr_err("Unable to recover from"
2432                                         " Immediate Data digest failure while"
2433                                         " in ERL=0.\n");
2434                                 iscsit_reject_cmd(cmd,
2435                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2436                                                 (unsigned char *)hdr);
2437                                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2438                         } else {
2439                                 iscsit_reject_cmd(cmd,
2440                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2441                                                 (unsigned char *)hdr);
2442                                 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2443                         }
2444                 } else {
2445                         pr_debug("Got CRC32C DataDigest 0x%08x for"
2446                                 " %u bytes of Immediate Data\n", checksum,
2447                                 length);
2448                 }
2449         }
2450
2451         cmd->write_data_done += length;
2452
2453         if (cmd->write_data_done == cmd->se_cmd.data_length) {
2454                 spin_lock_bh(&cmd->istate_lock);
2455                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2456                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2457                 spin_unlock_bh(&cmd->istate_lock);
2458         }
2459
2460         return IMMEDIATE_DATA_NORMAL_OPERATION;
2461 }
2462
2463 /*
2464  *      Called with sess->conn_lock held.
2465  */
2466 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2467         with active network interface */
2468 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2469 {
2470         struct iscsi_cmd *cmd;
2471         struct iscsi_conn *conn_p;
2472
2473         /*
2474          * Only send a Asynchronous Message on connections whos network
2475          * interface is still functional.
2476          */
2477         list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2478                 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2479                         iscsit_inc_conn_usage_count(conn_p);
2480                         break;
2481                 }
2482         }
2483
2484         if (!conn_p)
2485                 return;
2486
2487         cmd = iscsit_allocate_cmd(conn_p, GFP_ATOMIC);
2488         if (!cmd) {
2489                 iscsit_dec_conn_usage_count(conn_p);
2490                 return;
2491         }
2492
2493         cmd->logout_cid = conn->cid;
2494         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2495         cmd->i_state = ISTATE_SEND_ASYNCMSG;
2496
2497         spin_lock_bh(&conn_p->cmd_lock);
2498         list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2499         spin_unlock_bh(&conn_p->cmd_lock);
2500
2501         iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2502         iscsit_dec_conn_usage_count(conn_p);
2503 }
2504
2505 static int iscsit_send_conn_drop_async_message(
2506         struct iscsi_cmd *cmd,
2507         struct iscsi_conn *conn)
2508 {
2509         struct iscsi_async *hdr;
2510
2511         cmd->tx_size = ISCSI_HDR_LEN;
2512         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2513
2514         hdr                     = (struct iscsi_async *) cmd->pdu;
2515         hdr->opcode             = ISCSI_OP_ASYNC_EVENT;
2516         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
2517         cmd->init_task_tag      = RESERVED_ITT;
2518         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2519         put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2520         cmd->stat_sn            = conn->stat_sn++;
2521         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2522         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2523         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2524         hdr->async_event        = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2525         hdr->param1             = cpu_to_be16(cmd->logout_cid);
2526         hdr->param2             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2527         hdr->param3             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2528
2529         if (conn->conn_ops->HeaderDigest) {
2530                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2531
2532                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2533                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2534
2535                 cmd->tx_size += ISCSI_CRC_LEN;
2536                 pr_debug("Attaching CRC32C HeaderDigest to"
2537                         " Async Message 0x%08x\n", *header_digest);
2538         }
2539
2540         cmd->iov_misc[0].iov_base       = cmd->pdu;
2541         cmd->iov_misc[0].iov_len        = cmd->tx_size;
2542         cmd->iov_misc_count             = 1;
2543
2544         pr_debug("Sending Connection Dropped Async Message StatSN:"
2545                 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2546                         cmd->logout_cid, conn->cid);
2547         return 0;
2548 }
2549
2550 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2551 {
2552         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2553             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2554                 wait_for_completion_interruptible_timeout(
2555                                         &conn->tx_half_close_comp,
2556                                         ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2557         }
2558 }
2559
2560 static void
2561 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2562                         struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2563                         bool set_statsn)
2564 {
2565         hdr->opcode             = ISCSI_OP_SCSI_DATA_IN;
2566         hdr->flags              = datain->flags;
2567         if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2568                 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2569                         hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2570                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2571                 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2572                         hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2573                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2574                 }
2575         }
2576         hton24(hdr->dlength, datain->length);
2577         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2578                 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2579                                 (struct scsi_lun *)&hdr->lun);
2580         else
2581                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2582
2583         hdr->itt                = cmd->init_task_tag;
2584
2585         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2586                 hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2587         else
2588                 hdr->ttt                = cpu_to_be32(0xFFFFFFFF);
2589         if (set_statsn)
2590                 hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2591         else
2592                 hdr->statsn             = cpu_to_be32(0xFFFFFFFF);
2593
2594         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2595         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2596         hdr->datasn             = cpu_to_be32(datain->data_sn);
2597         hdr->offset             = cpu_to_be32(datain->offset);
2598
2599         pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2600                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2601                 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2602                 ntohl(hdr->offset), datain->length, conn->cid);
2603 }
2604
2605 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2606 {
2607         struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2608         struct iscsi_datain datain;
2609         struct iscsi_datain_req *dr;
2610         struct kvec *iov;
2611         u32 iov_count = 0, tx_size = 0;
2612         int eodr = 0, ret, iov_ret;
2613         bool set_statsn = false;
2614
2615         memset(&datain, 0, sizeof(struct iscsi_datain));
2616         dr = iscsit_get_datain_values(cmd, &datain);
2617         if (!dr) {
2618                 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2619                                 cmd->init_task_tag);
2620                 return -1;
2621         }
2622         /*
2623          * Be paranoid and double check the logic for now.
2624          */
2625         if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2626                 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2627                         " datain.length: %u exceeds cmd->data_length: %u\n",
2628                         cmd->init_task_tag, datain.offset, datain.length,
2629                         cmd->se_cmd.data_length);
2630                 return -1;
2631         }
2632
2633         spin_lock_bh(&conn->sess->session_stats_lock);
2634         conn->sess->tx_data_octets += datain.length;
2635         if (conn->sess->se_sess->se_node_acl) {
2636                 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
2637                 conn->sess->se_sess->se_node_acl->read_bytes += datain.length;
2638                 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
2639         }
2640         spin_unlock_bh(&conn->sess->session_stats_lock);
2641         /*
2642          * Special case for successfully execution w/ both DATAIN
2643          * and Sense Data.
2644          */
2645         if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2646             (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2647                 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2648         else {
2649                 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2650                     (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2651                         iscsit_increment_maxcmdsn(cmd, conn->sess);
2652                         cmd->stat_sn = conn->stat_sn++;
2653                         set_statsn = true;
2654                 } else if (dr->dr_complete ==
2655                            DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2656                         set_statsn = true;
2657         }
2658
2659         iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2660
2661         iov = &cmd->iov_data[0];
2662         iov[iov_count].iov_base = cmd->pdu;
2663         iov[iov_count++].iov_len        = ISCSI_HDR_LEN;
2664         tx_size += ISCSI_HDR_LEN;
2665
2666         if (conn->conn_ops->HeaderDigest) {
2667                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2668
2669                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
2670                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2671
2672                 iov[0].iov_len += ISCSI_CRC_LEN;
2673                 tx_size += ISCSI_CRC_LEN;
2674
2675                 pr_debug("Attaching CRC32 HeaderDigest"
2676                         " for DataIN PDU 0x%08x\n", *header_digest);
2677         }
2678
2679         iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
2680                                 datain.offset, datain.length);
2681         if (iov_ret < 0)
2682                 return -1;
2683
2684         iov_count += iov_ret;
2685         tx_size += datain.length;
2686
2687         cmd->padding = ((-datain.length) & 3);
2688         if (cmd->padding) {
2689                 iov[iov_count].iov_base         = cmd->pad_bytes;
2690                 iov[iov_count++].iov_len        = cmd->padding;
2691                 tx_size += cmd->padding;
2692
2693                 pr_debug("Attaching %u padding bytes\n",
2694                                 cmd->padding);
2695         }
2696         if (conn->conn_ops->DataDigest) {
2697                 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2698                          datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2699
2700                 iov[iov_count].iov_base = &cmd->data_crc;
2701                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2702                 tx_size += ISCSI_CRC_LEN;
2703
2704                 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2705                         " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2706         }
2707
2708         cmd->iov_data_count = iov_count;
2709         cmd->tx_size = tx_size;
2710
2711         /* sendpage is preferred but can't insert markers */
2712         if (!conn->conn_ops->IFMarker)
2713                 ret = iscsit_fe_sendpage_sg(cmd, conn);
2714         else
2715                 ret = iscsit_send_tx_data(cmd, conn, 0);
2716
2717         iscsit_unmap_iovec(cmd);
2718
2719         if (ret < 0) {
2720                 iscsit_tx_thread_wait_for_tcp(conn);
2721                 return ret;
2722         }
2723
2724         if (dr->dr_complete) {
2725                 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2726                                 2 : 1;
2727                 iscsit_free_datain_req(cmd, dr);
2728         }
2729
2730         return eodr;
2731 }
2732
2733 int
2734 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2735                         struct iscsi_logout_rsp *hdr)
2736 {
2737         struct iscsi_conn *logout_conn = NULL;
2738         struct iscsi_conn_recovery *cr = NULL;
2739         struct iscsi_session *sess = conn->sess;
2740         /*
2741          * The actual shutting down of Sessions and/or Connections
2742          * for CLOSESESSION and CLOSECONNECTION Logout Requests
2743          * is done in scsi_logout_post_handler().
2744          */
2745         switch (cmd->logout_reason) {
2746         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2747                 pr_debug("iSCSI session logout successful, setting"
2748                         " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2749                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2750                 break;
2751         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2752                 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2753                         break;
2754                 /*
2755                  * For CLOSECONNECTION logout requests carrying
2756                  * a matching logout CID -> local CID, the reference
2757                  * for the local CID will have been incremented in
2758                  * iscsi_logout_closeconnection().
2759                  *
2760                  * For CLOSECONNECTION logout requests carrying
2761                  * a different CID than the connection it arrived
2762                  * on, the connection responding to cmd->logout_cid
2763                  * is stopped in iscsit_logout_post_handler_diffcid().
2764                  */
2765
2766                 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2767                         " successful.\n", cmd->logout_cid, conn->cid);
2768                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2769                 break;
2770         case ISCSI_LOGOUT_REASON_RECOVERY:
2771                 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2772                     (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2773                         break;
2774                 /*
2775                  * If the connection is still active from our point of view
2776                  * force connection recovery to occur.
2777                  */
2778                 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2779                                 cmd->logout_cid);
2780                 if (logout_conn) {
2781                         iscsit_connection_reinstatement_rcfr(logout_conn);
2782                         iscsit_dec_conn_usage_count(logout_conn);
2783                 }
2784
2785                 cr = iscsit_get_inactive_connection_recovery_entry(
2786                                 conn->sess, cmd->logout_cid);
2787                 if (!cr) {
2788                         pr_err("Unable to locate CID: %hu for"
2789                         " REMOVECONNFORRECOVERY Logout Request.\n",
2790                                 cmd->logout_cid);
2791                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2792                         break;
2793                 }
2794
2795                 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2796
2797                 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2798                         " for recovery for CID: %hu on CID: %hu successful.\n",
2799                                 cmd->logout_cid, conn->cid);
2800                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2801                 break;
2802         default:
2803                 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2804                                 cmd->logout_reason);
2805                 return -1;
2806         }
2807
2808         hdr->opcode             = ISCSI_OP_LOGOUT_RSP;
2809         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2810         hdr->response           = cmd->logout_response;
2811         hdr->itt                = cmd->init_task_tag;
2812         cmd->stat_sn            = conn->stat_sn++;
2813         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2814
2815         iscsit_increment_maxcmdsn(cmd, conn->sess);
2816         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2817         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2818
2819         pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2820                 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2821                 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2822                 cmd->logout_cid, conn->cid);
2823
2824         return 0;
2825 }
2826 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2827
2828 static int
2829 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2830 {
2831         struct kvec *iov;
2832         int niov = 0, tx_size, rc;
2833
2834         rc = iscsit_build_logout_rsp(cmd, conn,
2835                         (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2836         if (rc < 0)
2837                 return rc;
2838
2839         tx_size = ISCSI_HDR_LEN;
2840         iov = &cmd->iov_misc[0];
2841         iov[niov].iov_base      = cmd->pdu;
2842         iov[niov++].iov_len     = ISCSI_HDR_LEN;
2843
2844         if (conn->conn_ops->HeaderDigest) {
2845                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2846
2847                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, &cmd->pdu[0],
2848                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2849
2850                 iov[0].iov_len += ISCSI_CRC_LEN;
2851                 tx_size += ISCSI_CRC_LEN;
2852                 pr_debug("Attaching CRC32C HeaderDigest to"
2853                         " Logout Response 0x%08x\n", *header_digest);
2854         }
2855         cmd->iov_misc_count = niov;
2856         cmd->tx_size = tx_size;
2857
2858         return 0;
2859 }
2860
2861 void
2862 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2863                        struct iscsi_nopin *hdr, bool nopout_response)
2864 {
2865         hdr->opcode             = ISCSI_OP_NOOP_IN;
2866         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2867         hton24(hdr->dlength, cmd->buf_ptr_size);
2868         if (nopout_response)
2869                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2870         hdr->itt                = cmd->init_task_tag;
2871         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2872         cmd->stat_sn            = (nopout_response) ? conn->stat_sn++ :
2873                                   conn->stat_sn;
2874         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2875
2876         if (nopout_response)
2877                 iscsit_increment_maxcmdsn(cmd, conn->sess);
2878
2879         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2880         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2881
2882         pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2883                 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2884                 "Solicitied" : "Unsolicitied", cmd->init_task_tag,
2885                 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2886 }
2887 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2888
2889 /*
2890  *      Unsolicited NOPIN, either requesting a response or not.
2891  */
2892 static int iscsit_send_unsolicited_nopin(
2893         struct iscsi_cmd *cmd,
2894         struct iscsi_conn *conn,
2895         int want_response)
2896 {
2897         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2898         int tx_size = ISCSI_HDR_LEN, ret;
2899
2900         iscsit_build_nopin_rsp(cmd, conn, hdr, false);
2901
2902         if (conn->conn_ops->HeaderDigest) {
2903                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2904
2905                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2906                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2907
2908                 tx_size += ISCSI_CRC_LEN;
2909                 pr_debug("Attaching CRC32C HeaderDigest to"
2910                         " NopIN 0x%08x\n", *header_digest);
2911         }
2912
2913         cmd->iov_misc[0].iov_base       = cmd->pdu;
2914         cmd->iov_misc[0].iov_len        = tx_size;
2915         cmd->iov_misc_count     = 1;
2916         cmd->tx_size            = tx_size;
2917
2918         pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2919                 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2920
2921         ret = iscsit_send_tx_data(cmd, conn, 1);
2922         if (ret < 0) {
2923                 iscsit_tx_thread_wait_for_tcp(conn);
2924                 return ret;
2925         }
2926
2927         spin_lock_bh(&cmd->istate_lock);
2928         cmd->i_state = want_response ?
2929                 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
2930         spin_unlock_bh(&cmd->istate_lock);
2931
2932         return 0;
2933 }
2934
2935 static int
2936 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2937 {
2938         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2939         struct kvec *iov;
2940         u32 padding = 0;
2941         int niov = 0, tx_size;
2942
2943         iscsit_build_nopin_rsp(cmd, conn, hdr, true);
2944
2945         tx_size = ISCSI_HDR_LEN;
2946         iov = &cmd->iov_misc[0];
2947         iov[niov].iov_base      = cmd->pdu;
2948         iov[niov++].iov_len     = ISCSI_HDR_LEN;
2949
2950         if (conn->conn_ops->HeaderDigest) {
2951                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2952
2953                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2954                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2955
2956                 iov[0].iov_len += ISCSI_CRC_LEN;
2957                 tx_size += ISCSI_CRC_LEN;
2958                 pr_debug("Attaching CRC32C HeaderDigest"
2959                         " to NopIn 0x%08x\n", *header_digest);
2960         }
2961
2962         /*
2963          * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2964          * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2965          */
2966         if (cmd->buf_ptr_size) {
2967                 iov[niov].iov_base      = cmd->buf_ptr;
2968                 iov[niov++].iov_len     = cmd->buf_ptr_size;
2969                 tx_size += cmd->buf_ptr_size;
2970
2971                 pr_debug("Echoing back %u bytes of ping"
2972                         " data.\n", cmd->buf_ptr_size);
2973
2974                 padding = ((-cmd->buf_ptr_size) & 3);
2975                 if (padding != 0) {
2976                         iov[niov].iov_base = &cmd->pad_bytes;
2977                         iov[niov++].iov_len = padding;
2978                         tx_size += padding;
2979                         pr_debug("Attaching %u additional"
2980                                 " padding bytes.\n", padding);
2981                 }
2982                 if (conn->conn_ops->DataDigest) {
2983                         iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2984                                 cmd->buf_ptr, cmd->buf_ptr_size,
2985                                 padding, (u8 *)&cmd->pad_bytes,
2986                                 (u8 *)&cmd->data_crc);
2987
2988                         iov[niov].iov_base = &cmd->data_crc;
2989                         iov[niov++].iov_len = ISCSI_CRC_LEN;
2990                         tx_size += ISCSI_CRC_LEN;
2991                         pr_debug("Attached DataDigest for %u"
2992                                 " bytes of ping data, CRC 0x%08x\n",
2993                                 cmd->buf_ptr_size, cmd->data_crc);
2994                 }
2995         }
2996
2997         cmd->iov_misc_count = niov;
2998         cmd->tx_size = tx_size;
2999
3000         return 0;
3001 }
3002
3003 static int iscsit_send_r2t(
3004         struct iscsi_cmd *cmd,
3005         struct iscsi_conn *conn)
3006 {
3007         int tx_size = 0;
3008         struct iscsi_r2t *r2t;
3009         struct iscsi_r2t_rsp *hdr;
3010         int ret;
3011
3012         r2t = iscsit_get_r2t_from_list(cmd);
3013         if (!r2t)
3014                 return -1;
3015
3016         hdr                     = (struct iscsi_r2t_rsp *) cmd->pdu;
3017         memset(hdr, 0, ISCSI_HDR_LEN);
3018         hdr->opcode             = ISCSI_OP_R2T;
3019         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3020         int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3021                         (struct scsi_lun *)&hdr->lun);
3022         hdr->itt                = cmd->init_task_tag;
3023         spin_lock_bh(&conn->sess->ttt_lock);
3024         r2t->targ_xfer_tag      = conn->sess->targ_xfer_tag++;
3025         if (r2t->targ_xfer_tag == 0xFFFFFFFF)
3026                 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
3027         spin_unlock_bh(&conn->sess->ttt_lock);
3028         hdr->ttt                = cpu_to_be32(r2t->targ_xfer_tag);
3029         hdr->statsn             = cpu_to_be32(conn->stat_sn);
3030         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3031         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3032         hdr->r2tsn              = cpu_to_be32(r2t->r2t_sn);
3033         hdr->data_offset        = cpu_to_be32(r2t->offset);
3034         hdr->data_length        = cpu_to_be32(r2t->xfer_len);
3035
3036         cmd->iov_misc[0].iov_base       = cmd->pdu;
3037         cmd->iov_misc[0].iov_len        = ISCSI_HDR_LEN;
3038         tx_size += ISCSI_HDR_LEN;
3039
3040         if (conn->conn_ops->HeaderDigest) {
3041                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3042
3043                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3044                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3045
3046                 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3047                 tx_size += ISCSI_CRC_LEN;
3048                 pr_debug("Attaching CRC32 HeaderDigest for R2T"
3049                         " PDU 0x%08x\n", *header_digest);
3050         }
3051
3052         pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3053                 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3054                 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3055                 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3056                         r2t->offset, r2t->xfer_len, conn->cid);
3057
3058         cmd->iov_misc_count = 1;
3059         cmd->tx_size = tx_size;
3060
3061         spin_lock_bh(&cmd->r2t_lock);
3062         r2t->sent_r2t = 1;
3063         spin_unlock_bh(&cmd->r2t_lock);
3064
3065         ret = iscsit_send_tx_data(cmd, conn, 1);
3066         if (ret < 0) {
3067                 iscsit_tx_thread_wait_for_tcp(conn);
3068                 return ret;
3069         }
3070
3071         spin_lock_bh(&cmd->dataout_timeout_lock);
3072         iscsit_start_dataout_timer(cmd, conn);
3073         spin_unlock_bh(&cmd->dataout_timeout_lock);
3074
3075         return 0;
3076 }
3077
3078 /*
3079  *      @recovery: If called from iscsi_task_reassign_complete_write() for
3080  *              connection recovery.
3081  */
3082 int iscsit_build_r2ts_for_cmd(
3083         struct iscsi_conn *conn,
3084         struct iscsi_cmd *cmd,
3085         bool recovery)
3086 {
3087         int first_r2t = 1;
3088         u32 offset = 0, xfer_len = 0;
3089
3090         spin_lock_bh(&cmd->r2t_lock);
3091         if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3092                 spin_unlock_bh(&cmd->r2t_lock);
3093                 return 0;
3094         }
3095
3096         if (conn->sess->sess_ops->DataSequenceInOrder &&
3097             !recovery)
3098                 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3099
3100         while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3101                 if (conn->sess->sess_ops->DataSequenceInOrder) {
3102                         offset = cmd->r2t_offset;
3103
3104                         if (first_r2t && recovery) {
3105                                 int new_data_end = offset +
3106                                         conn->sess->sess_ops->MaxBurstLength -
3107                                         cmd->next_burst_len;
3108
3109                                 if (new_data_end > cmd->se_cmd.data_length)
3110                                         xfer_len = cmd->se_cmd.data_length - offset;
3111                                 else
3112                                         xfer_len =
3113                                                 conn->sess->sess_ops->MaxBurstLength -
3114                                                 cmd->next_burst_len;
3115                         } else {
3116                                 int new_data_end = offset +
3117                                         conn->sess->sess_ops->MaxBurstLength;
3118
3119                                 if (new_data_end > cmd->se_cmd.data_length)
3120                                         xfer_len = cmd->se_cmd.data_length - offset;
3121                                 else
3122                                         xfer_len = conn->sess->sess_ops->MaxBurstLength;
3123                         }
3124                         cmd->r2t_offset += xfer_len;
3125
3126                         if (cmd->r2t_offset == cmd->se_cmd.data_length)
3127                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3128                 } else {
3129                         struct iscsi_seq *seq;
3130
3131                         seq = iscsit_get_seq_holder_for_r2t(cmd);
3132                         if (!seq) {
3133                                 spin_unlock_bh(&cmd->r2t_lock);
3134                                 return -1;
3135                         }
3136
3137                         offset = seq->offset;
3138                         xfer_len = seq->xfer_len;
3139
3140                         if (cmd->seq_send_order == cmd->seq_count)
3141                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3142                 }
3143                 cmd->outstanding_r2ts++;
3144                 first_r2t = 0;
3145
3146                 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3147                         spin_unlock_bh(&cmd->r2t_lock);
3148                         return -1;
3149                 }
3150
3151                 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3152                         break;
3153         }
3154         spin_unlock_bh(&cmd->r2t_lock);
3155
3156         return 0;
3157 }
3158
3159 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3160                         bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3161 {
3162         if (inc_stat_sn)
3163                 cmd->stat_sn = conn->stat_sn++;
3164
3165         spin_lock_bh(&conn->sess->session_stats_lock);
3166         conn->sess->rsp_pdus++;
3167         spin_unlock_bh(&conn->sess->session_stats_lock);
3168
3169         memset(hdr, 0, ISCSI_HDR_LEN);
3170         hdr->opcode             = ISCSI_OP_SCSI_CMD_RSP;
3171         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3172         if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3173                 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3174                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3175         } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3176                 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3177                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3178         }
3179         hdr->response           = cmd->iscsi_response;
3180         hdr->cmd_status         = cmd->se_cmd.scsi_status;
3181         hdr->itt                = cmd->init_task_tag;
3182         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3183
3184         iscsit_increment_maxcmdsn(cmd, conn->sess);
3185         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3186         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3187
3188         pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3189                 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3190                 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3191                 cmd->se_cmd.scsi_status, conn->cid);
3192 }
3193 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3194
3195 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3196 {
3197         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3198         struct kvec *iov;
3199         u32 padding = 0, tx_size = 0;
3200         int iov_count = 0;
3201         bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3202
3203         iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3204
3205         iov = &cmd->iov_misc[0];
3206         iov[iov_count].iov_base = cmd->pdu;
3207         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3208         tx_size += ISCSI_HDR_LEN;
3209
3210         /*
3211          * Attach SENSE DATA payload to iSCSI Response PDU
3212          */
3213         if (cmd->se_cmd.sense_buffer &&
3214            ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3215             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3216                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3217                 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3218
3219                 padding         = -(cmd->se_cmd.scsi_sense_length) & 3;
3220                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3221                 iov[iov_count].iov_base = cmd->sense_buffer;
3222                 iov[iov_count++].iov_len =
3223                                 (cmd->se_cmd.scsi_sense_length + padding);
3224                 tx_size += cmd->se_cmd.scsi_sense_length;
3225
3226                 if (padding) {
3227                         memset(cmd->sense_buffer +
3228                                 cmd->se_cmd.scsi_sense_length, 0, padding);
3229                         tx_size += padding;
3230                         pr_debug("Adding %u bytes of padding to"
3231                                 " SENSE.\n", padding);
3232                 }
3233
3234                 if (conn->conn_ops->DataDigest) {
3235                         iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3236                                 cmd->sense_buffer,
3237                                 (cmd->se_cmd.scsi_sense_length + padding),
3238                                 0, NULL, (u8 *)&cmd->data_crc);
3239
3240                         iov[iov_count].iov_base    = &cmd->data_crc;
3241                         iov[iov_count++].iov_len     = ISCSI_CRC_LEN;
3242                         tx_size += ISCSI_CRC_LEN;
3243
3244                         pr_debug("Attaching CRC32 DataDigest for"
3245                                 " SENSE, %u bytes CRC 0x%08x\n",
3246                                 (cmd->se_cmd.scsi_sense_length + padding),
3247                                 cmd->data_crc);
3248                 }
3249
3250                 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3251                                 " Response PDU\n",
3252                                 cmd->se_cmd.scsi_sense_length);
3253         }
3254
3255         if (conn->conn_ops->HeaderDigest) {
3256                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3257
3258                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
3259                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3260
3261                 iov[0].iov_len += ISCSI_CRC_LEN;
3262                 tx_size += ISCSI_CRC_LEN;
3263                 pr_debug("Attaching CRC32 HeaderDigest for Response"
3264                                 " PDU 0x%08x\n", *header_digest);
3265         }
3266
3267         cmd->iov_misc_count = iov_count;
3268         cmd->tx_size = tx_size;
3269
3270         return 0;
3271 }
3272
3273 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3274 {
3275         switch (se_tmr->response) {
3276         case TMR_FUNCTION_COMPLETE:
3277                 return ISCSI_TMF_RSP_COMPLETE;
3278         case TMR_TASK_DOES_NOT_EXIST:
3279                 return ISCSI_TMF_RSP_NO_TASK;
3280         case TMR_LUN_DOES_NOT_EXIST:
3281                 return ISCSI_TMF_RSP_NO_LUN;
3282         case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3283                 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3284         case TMR_FUNCTION_REJECTED:
3285         default:
3286                 return ISCSI_TMF_RSP_REJECTED;
3287         }
3288 }
3289
3290 void
3291 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3292                           struct iscsi_tm_rsp *hdr)
3293 {
3294         struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3295
3296         hdr->opcode             = ISCSI_OP_SCSI_TMFUNC_RSP;
3297         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
3298         hdr->response           = iscsit_convert_tcm_tmr_rsp(se_tmr);
3299         hdr->itt                = cmd->init_task_tag;
3300         cmd->stat_sn            = conn->stat_sn++;
3301         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3302
3303         iscsit_increment_maxcmdsn(cmd, conn->sess);
3304         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3305         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3306
3307         pr_debug("Built Task Management Response ITT: 0x%08x,"
3308                 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3309                 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3310 }
3311 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3312
3313 static int
3314 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3315 {
3316         struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3317         u32 tx_size = 0;
3318
3319         iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3320
3321         cmd->iov_misc[0].iov_base       = cmd->pdu;
3322         cmd->iov_misc[0].iov_len        = ISCSI_HDR_LEN;
3323         tx_size += ISCSI_HDR_LEN;
3324
3325         if (conn->conn_ops->HeaderDigest) {
3326                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3327
3328                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3329                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3330
3331                 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3332                 tx_size += ISCSI_CRC_LEN;
3333                 pr_debug("Attaching CRC32 HeaderDigest for Task"
3334                         " Mgmt Response PDU 0x%08x\n", *header_digest);
3335         }
3336
3337         cmd->iov_misc_count = 1;
3338         cmd->tx_size = tx_size;
3339
3340         return 0;
3341 }
3342
3343 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3344 {
3345         bool ret = false;
3346
3347         if (np->np_sockaddr.ss_family == AF_INET6) {
3348                 const struct sockaddr_in6 sin6 = {
3349                         .sin6_addr = IN6ADDR_ANY_INIT };
3350                 struct sockaddr_in6 *sock_in6 =
3351                          (struct sockaddr_in6 *)&np->np_sockaddr;
3352
3353                 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3354                                 sin6.sin6_addr.s6_addr, 16))
3355                         ret = true;
3356         } else {
3357                 struct sockaddr_in * sock_in =
3358                         (struct sockaddr_in *)&np->np_sockaddr;
3359
3360                 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
3361                         ret = true;
3362         }
3363
3364         return ret;
3365 }
3366
3367 #define SENDTARGETS_BUF_LIMIT 32768U
3368
3369 static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd)
3370 {
3371         char *payload = NULL;
3372         struct iscsi_conn *conn = cmd->conn;
3373         struct iscsi_portal_group *tpg;
3374         struct iscsi_tiqn *tiqn;
3375         struct iscsi_tpg_np *tpg_np;
3376         int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3377         int target_name_printed;
3378         unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3379         unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3380
3381         buffer_len = max(conn->conn_ops->MaxRecvDataSegmentLength,
3382                          SENDTARGETS_BUF_LIMIT);
3383
3384         payload = kzalloc(buffer_len, GFP_KERNEL);
3385         if (!payload) {
3386                 pr_err("Unable to allocate memory for sendtargets"
3387                                 " response.\n");
3388                 return -ENOMEM;
3389         }
3390         /*
3391          * Locate pointer to iqn./eui. string for IFC_SENDTARGETS_SINGLE
3392          * explicit case..
3393          */
3394         if (cmd->cmd_flags & IFC_SENDTARGETS_SINGLE) {
3395                 text_ptr = strchr(text_in, '=');
3396                 if (!text_ptr) {
3397                         pr_err("Unable to locate '=' string in text_in:"
3398                                " %s\n", text_in);
3399                         kfree(payload);
3400                         return -EINVAL;
3401                 }
3402                 /*
3403                  * Skip over '=' character..
3404                  */
3405                 text_ptr += 1;
3406         }
3407
3408         spin_lock(&tiqn_lock);
3409         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3410                 if ((cmd->cmd_flags & IFC_SENDTARGETS_SINGLE) &&
3411                      strcmp(tiqn->tiqn, text_ptr)) {
3412                         continue;
3413                 }
3414
3415                 target_name_printed = 0;
3416
3417                 spin_lock(&tiqn->tiqn_tpg_lock);
3418                 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3419
3420                         /* If demo_mode_discovery=0 and generate_node_acls=0
3421                          * (demo mode dislabed) do not return
3422                          * TargetName+TargetAddress unless a NodeACL exists.
3423                          */
3424
3425                         if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3426                             (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3427                             (!core_tpg_get_initiator_node_acl(&tpg->tpg_se_tpg,
3428                                 cmd->conn->sess->sess_ops->InitiatorName))) {
3429                                 continue;
3430                         }
3431
3432                         spin_lock(&tpg->tpg_state_lock);
3433                         if ((tpg->tpg_state == TPG_STATE_FREE) ||
3434                             (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3435                                 spin_unlock(&tpg->tpg_state_lock);
3436                                 continue;
3437                         }
3438                         spin_unlock(&tpg->tpg_state_lock);
3439
3440                         spin_lock(&tpg->tpg_np_lock);
3441                         list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3442                                                 tpg_np_list) {
3443                                 struct iscsi_np *np = tpg_np->tpg_np;
3444                                 bool inaddr_any = iscsit_check_inaddr_any(np);
3445
3446                                 if (!target_name_printed) {
3447                                         len = sprintf(buf, "TargetName=%s",
3448                                                       tiqn->tiqn);
3449                                         len += 1;
3450
3451                                         if ((len + payload_len) > buffer_len) {
3452                                                 spin_unlock(&tpg->tpg_np_lock);
3453                                                 spin_unlock(&tiqn->tiqn_tpg_lock);
3454                                                 end_of_buf = 1;
3455                                                 goto eob;
3456                                         }
3457                                         memcpy(payload + payload_len, buf, len);
3458                                         payload_len += len;
3459                                         target_name_printed = 1;
3460                                 }
3461
3462                                 len = sprintf(buf, "TargetAddress="
3463                                         "%s:%hu,%hu",
3464                                         (inaddr_any == false) ?
3465                                                 np->np_ip : conn->local_ip,
3466                                         (inaddr_any == false) ?
3467                                                 np->np_port : conn->local_port,
3468                                         tpg->tpgt);
3469                                 len += 1;
3470
3471                                 if ((len + payload_len) > buffer_len) {
3472                                         spin_unlock(&tpg->tpg_np_lock);
3473                                         spin_unlock(&tiqn->tiqn_tpg_lock);
3474                                         end_of_buf = 1;
3475                                         goto eob;
3476                                 }
3477                                 memcpy(payload + payload_len, buf, len);
3478                                 payload_len += len;
3479                         }
3480                         spin_unlock(&tpg->tpg_np_lock);
3481                 }
3482                 spin_unlock(&tiqn->tiqn_tpg_lock);
3483 eob:
3484                 if (end_of_buf)
3485                         break;
3486
3487                 if (cmd->cmd_flags & IFC_SENDTARGETS_SINGLE)
3488                         break;
3489         }
3490         spin_unlock(&tiqn_lock);
3491
3492         cmd->buf_ptr = payload;
3493
3494         return payload_len;
3495 }
3496
3497 int
3498 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3499                       struct iscsi_text_rsp *hdr)
3500 {
3501         int text_length, padding;
3502
3503         text_length = iscsit_build_sendtargets_response(cmd);
3504         if (text_length < 0)
3505                 return text_length;
3506
3507         hdr->opcode = ISCSI_OP_TEXT_RSP;
3508         hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3509         padding = ((-text_length) & 3);
3510         hton24(hdr->dlength, text_length);
3511         hdr->itt = cmd->init_task_tag;
3512         hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3513         cmd->stat_sn = conn->stat_sn++;
3514         hdr->statsn = cpu_to_be32(cmd->stat_sn);
3515
3516         iscsit_increment_maxcmdsn(cmd, conn->sess);
3517         hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3518         hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3519
3520         pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
3521                 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn,
3522                 text_length, conn->cid);
3523
3524         return text_length + padding;
3525 }
3526 EXPORT_SYMBOL(iscsit_build_text_rsp);
3527
3528 /*
3529  *      FIXME: Add support for F_BIT and C_BIT when the length is longer than
3530  *      MaxRecvDataSegmentLength.
3531  */
3532 static int iscsit_send_text_rsp(
3533         struct iscsi_cmd *cmd,
3534         struct iscsi_conn *conn)
3535 {
3536         struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3537         struct kvec *iov;
3538         u32 tx_size = 0;
3539         int text_length, iov_count = 0, rc;
3540
3541         rc = iscsit_build_text_rsp(cmd, conn, hdr);
3542         if (rc < 0)
3543                 return rc;
3544
3545         text_length = rc;
3546         iov = &cmd->iov_misc[0];
3547         iov[iov_count].iov_base = cmd->pdu;
3548         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3549         iov[iov_count].iov_base = cmd->buf_ptr;
3550         iov[iov_count++].iov_len = text_length;
3551
3552         tx_size += (ISCSI_HDR_LEN + text_length);
3553
3554         if (conn->conn_ops->HeaderDigest) {
3555                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3556
3557                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3558                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3559
3560                 iov[0].iov_len += ISCSI_CRC_LEN;
3561                 tx_size += ISCSI_CRC_LEN;
3562                 pr_debug("Attaching CRC32 HeaderDigest for"
3563                         " Text Response PDU 0x%08x\n", *header_digest);
3564         }
3565
3566         if (conn->conn_ops->DataDigest) {
3567                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3568                                 cmd->buf_ptr, text_length,
3569                                 0, NULL, (u8 *)&cmd->data_crc);
3570
3571                 iov[iov_count].iov_base = &cmd->data_crc;
3572                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3573                 tx_size += ISCSI_CRC_LEN;
3574
3575                 pr_debug("Attaching DataDigest for %u bytes of text"
3576                         " data, CRC 0x%08x\n", text_length,
3577                         cmd->data_crc);
3578         }
3579
3580         cmd->iov_misc_count = iov_count;
3581         cmd->tx_size = tx_size;
3582
3583         return 0;
3584 }
3585
3586 void
3587 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3588                     struct iscsi_reject *hdr)
3589 {
3590         hdr->opcode             = ISCSI_OP_REJECT;
3591         hdr->reason             = cmd->reject_reason;
3592         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3593         hton24(hdr->dlength, ISCSI_HDR_LEN);
3594         hdr->ffffffff           = cpu_to_be32(0xffffffff);
3595         cmd->stat_sn            = conn->stat_sn++;
3596         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3597         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3598         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3599
3600 }
3601 EXPORT_SYMBOL(iscsit_build_reject);
3602
3603 static int iscsit_send_reject(
3604         struct iscsi_cmd *cmd,
3605         struct iscsi_conn *conn)
3606 {
3607         struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3608         struct kvec *iov;
3609         u32 iov_count = 0, tx_size;
3610
3611         iscsit_build_reject(cmd, conn, hdr);
3612
3613         iov = &cmd->iov_misc[0];
3614         iov[iov_count].iov_base = cmd->pdu;
3615         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3616         iov[iov_count].iov_base = cmd->buf_ptr;
3617         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3618
3619         tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3620
3621         if (conn->conn_ops->HeaderDigest) {
3622                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3623
3624                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3625                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3626
3627                 iov[0].iov_len += ISCSI_CRC_LEN;
3628                 tx_size += ISCSI_CRC_LEN;
3629                 pr_debug("Attaching CRC32 HeaderDigest for"
3630                         " REJECT PDU 0x%08x\n", *header_digest);
3631         }
3632
3633         if (conn->conn_ops->DataDigest) {
3634                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->buf_ptr,
3635                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)&cmd->data_crc);
3636
3637                 iov[iov_count].iov_base = &cmd->data_crc;
3638                 iov[iov_count++].iov_len  = ISCSI_CRC_LEN;
3639                 tx_size += ISCSI_CRC_LEN;
3640                 pr_debug("Attaching CRC32 DataDigest for REJECT"
3641                                 " PDU 0x%08x\n", cmd->data_crc);
3642         }
3643
3644         cmd->iov_misc_count = iov_count;
3645         cmd->tx_size = tx_size;
3646
3647         pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3648                 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3649
3650         return 0;
3651 }
3652
3653 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3654 {
3655         struct iscsi_thread_set *ts = conn->thread_set;
3656         int ord, cpu;
3657         /*
3658          * thread_id is assigned from iscsit_global->ts_bitmap from
3659          * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
3660          *
3661          * Here we use thread_id to determine which CPU that this
3662          * iSCSI connection's iscsi_thread_set will be scheduled to
3663          * execute upon.
3664          */
3665         ord = ts->thread_id % cpumask_weight(cpu_online_mask);
3666         for_each_online_cpu(cpu) {
3667                 if (ord-- == 0) {
3668                         cpumask_set_cpu(cpu, conn->conn_cpumask);
3669                         return;
3670                 }
3671         }
3672         /*
3673          * This should never be reached..
3674          */
3675         dump_stack();
3676         cpumask_setall(conn->conn_cpumask);
3677 }
3678
3679 static inline void iscsit_thread_check_cpumask(
3680         struct iscsi_conn *conn,
3681         struct task_struct *p,
3682         int mode)
3683 {
3684         char buf[128];
3685         /*
3686          * mode == 1 signals iscsi_target_tx_thread() usage.
3687          * mode == 0 signals iscsi_target_rx_thread() usage.
3688          */
3689         if (mode == 1) {
3690                 if (!conn->conn_tx_reset_cpumask)
3691                         return;
3692                 conn->conn_tx_reset_cpumask = 0;
3693         } else {
3694                 if (!conn->conn_rx_reset_cpumask)
3695                         return;
3696                 conn->conn_rx_reset_cpumask = 0;
3697         }
3698         /*
3699          * Update the CPU mask for this single kthread so that
3700          * both TX and RX kthreads are scheduled to run on the
3701          * same CPU.
3702          */
3703         memset(buf, 0, 128);
3704         cpumask_scnprintf(buf, 128, conn->conn_cpumask);
3705         set_cpus_allowed_ptr(p, conn->conn_cpumask);
3706 }
3707
3708 static int
3709 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3710 {
3711         int ret;
3712
3713         switch (state) {
3714         case ISTATE_SEND_R2T:
3715                 ret = iscsit_send_r2t(cmd, conn);
3716                 if (ret < 0)
3717                         goto err;
3718                 break;
3719         case ISTATE_REMOVE:
3720                 spin_lock_bh(&conn->cmd_lock);
3721                 list_del(&cmd->i_conn_node);
3722                 spin_unlock_bh(&conn->cmd_lock);
3723
3724                 iscsit_free_cmd(cmd, false);
3725                 break;
3726         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3727                 iscsit_mod_nopin_response_timer(conn);
3728                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3729                 if (ret < 0)
3730                         goto err;
3731                 break;
3732         case ISTATE_SEND_NOPIN_NO_RESPONSE:
3733                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3734                 if (ret < 0)
3735                         goto err;
3736                 break;
3737         default:
3738                 pr_err("Unknown Opcode: 0x%02x ITT:"
3739                        " 0x%08x, i_state: %d on CID: %hu\n",
3740                        cmd->iscsi_opcode, cmd->init_task_tag, state,
3741                        conn->cid);
3742                 goto err;
3743         }
3744
3745         return 0;
3746
3747 err:
3748         return -1;
3749 }
3750
3751 static int
3752 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3753 {
3754         struct iscsit_transport *t = conn->conn_transport;
3755         struct iscsi_queue_req *qr;
3756         struct iscsi_cmd *cmd;
3757         u8 state;
3758         int ret;
3759
3760         while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3761                 atomic_set(&conn->check_immediate_queue, 0);
3762                 cmd = qr->cmd;
3763                 state = qr->state;
3764                 kmem_cache_free(lio_qr_cache, qr);
3765
3766                 ret = t->iscsit_immediate_queue(conn, cmd, state);
3767                 if (ret < 0)
3768                         return ret;
3769         }
3770
3771         return 0;
3772 }
3773
3774 static int
3775 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3776 {
3777         int ret;
3778
3779 check_rsp_state:
3780         switch (state) {
3781         case ISTATE_SEND_DATAIN:
3782                 ret = iscsit_send_datain(cmd, conn);
3783                 if (ret < 0)
3784                         goto err;
3785                 else if (!ret)
3786                         /* more drs */
3787                         goto check_rsp_state;
3788                 else if (ret == 1) {
3789                         /* all done */
3790                         spin_lock_bh(&cmd->istate_lock);
3791                         cmd->i_state = ISTATE_SENT_STATUS;
3792                         spin_unlock_bh(&cmd->istate_lock);
3793
3794                         if (atomic_read(&conn->check_immediate_queue))
3795                                 return 1;
3796
3797                         return 0;
3798                 } else if (ret == 2) {
3799                         /* Still must send status,
3800                            SCF_TRANSPORT_TASK_SENSE was set */
3801                         spin_lock_bh(&cmd->istate_lock);
3802                         cmd->i_state = ISTATE_SEND_STATUS;
3803                         spin_unlock_bh(&cmd->istate_lock);
3804                         state = ISTATE_SEND_STATUS;
3805                         goto check_rsp_state;
3806                 }
3807
3808                 break;
3809         case ISTATE_SEND_STATUS:
3810         case ISTATE_SEND_STATUS_RECOVERY:
3811                 ret = iscsit_send_response(cmd, conn);
3812                 break;
3813         case ISTATE_SEND_LOGOUTRSP:
3814                 ret = iscsit_send_logout(cmd, conn);
3815                 break;
3816         case ISTATE_SEND_ASYNCMSG:
3817                 ret = iscsit_send_conn_drop_async_message(
3818                         cmd, conn);
3819                 break;
3820         case ISTATE_SEND_NOPIN:
3821                 ret = iscsit_send_nopin(cmd, conn);
3822                 break;
3823         case ISTATE_SEND_REJECT:
3824                 ret = iscsit_send_reject(cmd, conn);
3825                 break;
3826         case ISTATE_SEND_TASKMGTRSP:
3827                 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3828                 if (ret != 0)
3829                         break;
3830                 ret = iscsit_tmr_post_handler(cmd, conn);
3831                 if (ret != 0)
3832                         iscsit_fall_back_to_erl0(conn->sess);
3833                 break;
3834         case ISTATE_SEND_TEXTRSP:
3835                 ret = iscsit_send_text_rsp(cmd, conn);
3836                 break;
3837         default:
3838                 pr_err("Unknown Opcode: 0x%02x ITT:"
3839                        " 0x%08x, i_state: %d on CID: %hu\n",
3840                        cmd->iscsi_opcode, cmd->init_task_tag,
3841                        state, conn->cid);
3842                 goto err;
3843         }
3844         if (ret < 0)
3845                 goto err;
3846
3847         if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3848                 iscsit_tx_thread_wait_for_tcp(conn);
3849                 iscsit_unmap_iovec(cmd);
3850                 goto err;
3851         }
3852         iscsit_unmap_iovec(cmd);
3853
3854         switch (state) {
3855         case ISTATE_SEND_LOGOUTRSP:
3856                 if (!iscsit_logout_post_handler(cmd, conn))
3857                         goto restart;
3858                 /* fall through */
3859         case ISTATE_SEND_STATUS:
3860         case ISTATE_SEND_ASYNCMSG:
3861         case ISTATE_SEND_NOPIN:
3862         case ISTATE_SEND_STATUS_RECOVERY:
3863         case ISTATE_SEND_TEXTRSP:
3864         case ISTATE_SEND_TASKMGTRSP:
3865         case ISTATE_SEND_REJECT:
3866                 spin_lock_bh(&cmd->istate_lock);
3867                 cmd->i_state = ISTATE_SENT_STATUS;
3868                 spin_unlock_bh(&cmd->istate_lock);
3869                 break;
3870         default:
3871                 pr_err("Unknown Opcode: 0x%02x ITT:"
3872                        " 0x%08x, i_state: %d on CID: %hu\n",
3873                        cmd->iscsi_opcode, cmd->init_task_tag,
3874                        cmd->i_state, conn->cid);
3875                 goto err;
3876         }
3877
3878         if (atomic_read(&conn->check_immediate_queue))
3879                 return 1;
3880
3881         return 0;
3882
3883 err:
3884         return -1;
3885 restart:
3886         return -EAGAIN;
3887 }
3888
3889 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3890 {
3891         struct iscsit_transport *t = conn->conn_transport;
3892         struct iscsi_queue_req *qr;
3893         struct iscsi_cmd *cmd;
3894         u8 state;
3895         int ret;
3896
3897         while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3898                 cmd = qr->cmd;
3899                 state = qr->state;
3900                 kmem_cache_free(lio_qr_cache, qr);
3901
3902                 ret = t->iscsit_response_queue(conn, cmd, state);
3903                 if (ret == 1 || ret < 0)
3904                         return ret;
3905         }
3906
3907         return 0;
3908 }
3909
3910 int iscsi_target_tx_thread(void *arg)
3911 {
3912         int ret = 0;
3913         struct iscsi_conn *conn;
3914         struct iscsi_thread_set *ts = arg;
3915         /*
3916          * Allow ourselves to be interrupted by SIGINT so that a
3917          * connection recovery / failure event can be triggered externally.
3918          */
3919         allow_signal(SIGINT);
3920
3921 restart:
3922         conn = iscsi_tx_thread_pre_handler(ts);
3923         if (!conn)
3924                 goto out;
3925
3926         ret = 0;
3927
3928         while (!kthread_should_stop()) {
3929                 /*
3930                  * Ensure that both TX and RX per connection kthreads
3931                  * are scheduled to run on the same CPU.
3932                  */
3933                 iscsit_thread_check_cpumask(conn, current, 1);
3934
3935                 wait_event_interruptible(conn->queues_wq,
3936                                          !iscsit_conn_all_queues_empty(conn) ||
3937                                          ts->status == ISCSI_THREAD_SET_RESET);
3938
3939                 if ((ts->status == ISCSI_THREAD_SET_RESET) ||
3940                      signal_pending(current))
3941                         goto transport_err;
3942
3943 get_immediate:
3944                 ret = iscsit_handle_immediate_queue(conn);
3945                 if (ret < 0)
3946                         goto transport_err;
3947
3948                 ret = iscsit_handle_response_queue(conn);
3949                 if (ret == 1)
3950                         goto get_immediate;
3951                 else if (ret == -EAGAIN)
3952                         goto restart;
3953                 else if (ret < 0)
3954                         goto transport_err;
3955         }
3956
3957 transport_err:
3958         iscsit_take_action_for_connection_exit(conn);
3959         goto restart;
3960 out:
3961         return 0;
3962 }
3963
3964 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3965 {
3966         struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3967         struct iscsi_cmd *cmd;
3968         int ret = 0;
3969
3970         switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3971         case ISCSI_OP_SCSI_CMD:
3972                 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3973                 if (!cmd)
3974                         goto reject;
3975
3976                 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3977                 break;
3978         case ISCSI_OP_SCSI_DATA_OUT:
3979                 ret = iscsit_handle_data_out(conn, buf);
3980                 break;
3981         case ISCSI_OP_NOOP_OUT:
3982                 cmd = NULL;
3983                 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3984                         cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3985                         if (!cmd)
3986                                 goto reject;
3987                 }
3988                 ret = iscsit_handle_nop_out(conn, cmd, buf);
3989                 break;
3990         case ISCSI_OP_SCSI_TMFUNC:
3991                 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3992                 if (!cmd)
3993                         goto reject;
3994
3995                 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3996                 break;
3997         case ISCSI_OP_TEXT:
3998                 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
3999                 if (!cmd)
4000                         goto reject;
4001
4002                 ret = iscsit_handle_text_cmd(conn, cmd, buf);
4003                 break;
4004         case ISCSI_OP_LOGOUT:
4005                 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
4006                 if (!cmd)
4007                         goto reject;
4008
4009                 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
4010                 if (ret > 0)
4011                         wait_for_completion_timeout(&conn->conn_logout_comp,
4012                                         SECONDS_FOR_LOGOUT_COMP * HZ);
4013                 break;
4014         case ISCSI_OP_SNACK:
4015                 ret = iscsit_handle_snack(conn, buf);
4016                 break;
4017         default:
4018                 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
4019                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
4020                         pr_err("Cannot recover from unknown"
4021                         " opcode while ERL=0, closing iSCSI connection.\n");
4022                         return -1;
4023                 }
4024                 if (!conn->conn_ops->OFMarker) {
4025                         pr_err("Unable to recover from unknown"
4026                         " opcode while OFMarker=No, closing iSCSI"
4027                                 " connection.\n");
4028                         return -1;
4029                 }
4030                 if (iscsit_recover_from_unknown_opcode(conn) < 0) {
4031                         pr_err("Unable to recover from unknown"
4032                                 " opcode, closing iSCSI connection.\n");
4033                         return -1;
4034                 }
4035                 break;
4036         }
4037
4038         return ret;
4039 reject:
4040         return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
4041 }
4042
4043 int iscsi_target_rx_thread(void *arg)
4044 {
4045         int ret;
4046         u8 buffer[ISCSI_HDR_LEN], opcode;
4047         u32 checksum = 0, digest = 0;
4048         struct iscsi_conn *conn = NULL;
4049         struct iscsi_thread_set *ts = arg;
4050         struct kvec iov;
4051         /*
4052          * Allow ourselves to be interrupted by SIGINT so that a
4053          * connection recovery / failure event can be triggered externally.
4054          */
4055         allow_signal(SIGINT);
4056
4057 restart:
4058         conn = iscsi_rx_thread_pre_handler(ts);
4059         if (!conn)
4060                 goto out;
4061
4062         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) {
4063                 struct completion comp;
4064                 int rc;
4065
4066                 init_completion(&comp);
4067                 rc = wait_for_completion_interruptible(&comp);
4068                 if (rc < 0)
4069                         goto transport_err;
4070
4071                 goto out;
4072         }
4073
4074         while (!kthread_should_stop()) {
4075                 /*
4076                  * Ensure that both TX and RX per connection kthreads
4077                  * are scheduled to run on the same CPU.
4078                  */
4079                 iscsit_thread_check_cpumask(conn, current, 0);
4080
4081                 memset(buffer, 0, ISCSI_HDR_LEN);
4082                 memset(&iov, 0, sizeof(struct kvec));
4083
4084                 iov.iov_base    = buffer;
4085                 iov.iov_len     = ISCSI_HDR_LEN;
4086
4087                 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
4088                 if (ret != ISCSI_HDR_LEN) {
4089                         iscsit_rx_thread_wait_for_tcp(conn);
4090                         goto transport_err;
4091                 }
4092
4093                 if (conn->conn_ops->HeaderDigest) {
4094                         iov.iov_base    = &digest;
4095                         iov.iov_len     = ISCSI_CRC_LEN;
4096
4097                         ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
4098                         if (ret != ISCSI_CRC_LEN) {
4099                                 iscsit_rx_thread_wait_for_tcp(conn);
4100                                 goto transport_err;
4101                         }
4102
4103                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
4104                                         buffer, ISCSI_HDR_LEN,
4105                                         0, NULL, (u8 *)&checksum);
4106
4107                         if (digest != checksum) {
4108                                 pr_err("HeaderDigest CRC32C failed,"
4109                                         " received 0x%08x, computed 0x%08x\n",
4110                                         digest, checksum);
4111                                 /*
4112                                  * Set the PDU to 0xff so it will intentionally
4113                                  * hit default in the switch below.
4114                                  */
4115                                 memset(buffer, 0xff, ISCSI_HDR_LEN);
4116                                 spin_lock_bh(&conn->sess->session_stats_lock);
4117                                 conn->sess->conn_digest_errors++;
4118                                 spin_unlock_bh(&conn->sess->session_stats_lock);
4119                         } else {
4120                                 pr_debug("Got HeaderDigest CRC32C"
4121                                                 " 0x%08x\n", checksum);
4122                         }
4123                 }
4124
4125                 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4126                         goto transport_err;
4127
4128                 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4129
4130                 if (conn->sess->sess_ops->SessionType &&
4131                    ((!(opcode & ISCSI_OP_TEXT)) ||
4132                     (!(opcode & ISCSI_OP_LOGOUT)))) {
4133                         pr_err("Received illegal iSCSI Opcode: 0x%02x"
4134                         " while in Discovery Session, rejecting.\n", opcode);
4135                         iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4136                                           buffer);
4137                         goto transport_err;
4138                 }
4139
4140                 ret = iscsi_target_rx_opcode(conn, buffer);
4141                 if (ret < 0)
4142                         goto transport_err;
4143         }
4144
4145 transport_err:
4146         if (!signal_pending(current))
4147                 atomic_set(&conn->transport_failed, 1);
4148         iscsit_take_action_for_connection_exit(conn);
4149         goto restart;
4150 out:
4151         return 0;
4152 }
4153
4154 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4155 {
4156         struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4157         struct iscsi_session *sess = conn->sess;
4158         /*
4159          * We expect this function to only ever be called from either RX or TX
4160          * thread context via iscsit_close_connection() once the other context
4161          * has been reset -> returned sleeping pre-handler state.
4162          */
4163         spin_lock_bh(&conn->cmd_lock);
4164         list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) {
4165
4166                 list_del(&cmd->i_conn_node);
4167                 spin_unlock_bh(&conn->cmd_lock);
4168
4169                 iscsit_increment_maxcmdsn(cmd, sess);
4170
4171                 iscsit_free_cmd(cmd, true);
4172
4173                 spin_lock_bh(&conn->cmd_lock);
4174         }
4175         spin_unlock_bh(&conn->cmd_lock);
4176 }
4177
4178 static void iscsit_stop_timers_for_cmds(
4179         struct iscsi_conn *conn)
4180 {
4181         struct iscsi_cmd *cmd;
4182
4183         spin_lock_bh(&conn->cmd_lock);
4184         list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4185                 if (cmd->data_direction == DMA_TO_DEVICE)
4186                         iscsit_stop_dataout_timer(cmd);
4187         }
4188         spin_unlock_bh(&conn->cmd_lock);
4189 }
4190
4191 int iscsit_close_connection(
4192         struct iscsi_conn *conn)
4193 {
4194         int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4195         struct iscsi_session    *sess = conn->sess;
4196
4197         pr_debug("Closing iSCSI connection CID %hu on SID:"
4198                 " %u\n", conn->cid, sess->sid);
4199         /*
4200          * Always up conn_logout_comp just in case the RX Thread is sleeping
4201          * and the logout response never got sent because the connection
4202          * failed.
4203          */
4204         complete(&conn->conn_logout_comp);
4205
4206         iscsi_release_thread_set(conn);
4207
4208         iscsit_stop_timers_for_cmds(conn);
4209         iscsit_stop_nopin_response_timer(conn);
4210         iscsit_stop_nopin_timer(conn);
4211         iscsit_free_queue_reqs_for_conn(conn);
4212
4213         /*
4214          * During Connection recovery drop unacknowledged out of order
4215          * commands for this connection, and prepare the other commands
4216          * for realligence.
4217          *
4218          * During normal operation clear the out of order commands (but
4219          * do not free the struct iscsi_ooo_cmdsn's) and release all
4220          * struct iscsi_cmds.
4221          */
4222         if (atomic_read(&conn->connection_recovery)) {
4223                 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4224                 iscsit_prepare_cmds_for_realligance(conn);
4225         } else {
4226                 iscsit_clear_ooo_cmdsns_for_conn(conn);
4227                 iscsit_release_commands_from_conn(conn);
4228         }
4229
4230         /*
4231          * Handle decrementing session or connection usage count if
4232          * a logout response was not able to be sent because the
4233          * connection failed.  Fall back to Session Recovery here.
4234          */
4235         if (atomic_read(&conn->conn_logout_remove)) {
4236                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4237                         iscsit_dec_conn_usage_count(conn);
4238                         iscsit_dec_session_usage_count(sess);
4239                 }
4240                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4241                         iscsit_dec_conn_usage_count(conn);
4242
4243                 atomic_set(&conn->conn_logout_remove, 0);
4244                 atomic_set(&sess->session_reinstatement, 0);
4245                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4246         }
4247
4248         spin_lock_bh(&sess->conn_lock);
4249         list_del(&conn->conn_list);
4250
4251         /*
4252          * Attempt to let the Initiator know this connection failed by
4253          * sending an Connection Dropped Async Message on another
4254          * active connection.
4255          */
4256         if (atomic_read(&conn->connection_recovery))
4257                 iscsit_build_conn_drop_async_message(conn);
4258
4259         spin_unlock_bh(&sess->conn_lock);
4260
4261         /*
4262          * If connection reinstatement is being performed on this connection,
4263          * up the connection reinstatement semaphore that is being blocked on
4264          * in iscsit_cause_connection_reinstatement().
4265          */
4266         spin_lock_bh(&conn->state_lock);
4267         if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4268                 spin_unlock_bh(&conn->state_lock);
4269                 complete(&conn->conn_wait_comp);
4270                 wait_for_completion(&conn->conn_post_wait_comp);
4271                 spin_lock_bh(&conn->state_lock);
4272         }
4273
4274         /*
4275          * If connection reinstatement is being performed on this connection
4276          * by receiving a REMOVECONNFORRECOVERY logout request, up the
4277          * connection wait rcfr semaphore that is being blocked on
4278          * an iscsit_connection_reinstatement_rcfr().
4279          */
4280         if (atomic_read(&conn->connection_wait_rcfr)) {
4281                 spin_unlock_bh(&conn->state_lock);
4282                 complete(&conn->conn_wait_rcfr_comp);
4283                 wait_for_completion(&conn->conn_post_wait_comp);
4284                 spin_lock_bh(&conn->state_lock);
4285         }
4286         atomic_set(&conn->connection_reinstatement, 1);
4287         spin_unlock_bh(&conn->state_lock);
4288
4289         /*
4290          * If any other processes are accessing this connection pointer we
4291          * must wait until they have completed.
4292          */
4293         iscsit_check_conn_usage_count(conn);
4294
4295         if (conn->conn_rx_hash.tfm)
4296                 crypto_free_hash(conn->conn_rx_hash.tfm);
4297         if (conn->conn_tx_hash.tfm)
4298                 crypto_free_hash(conn->conn_tx_hash.tfm);
4299
4300         if (conn->conn_cpumask)
4301                 free_cpumask_var(conn->conn_cpumask);
4302
4303         kfree(conn->conn_ops);
4304         conn->conn_ops = NULL;
4305
4306         if (conn->sock)
4307                 sock_release(conn->sock);
4308
4309         if (conn->conn_transport->iscsit_free_conn)
4310                 conn->conn_transport->iscsit_free_conn(conn);
4311
4312         iscsit_put_transport(conn->conn_transport);
4313
4314         conn->thread_set = NULL;
4315
4316         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4317         conn->conn_state = TARG_CONN_STATE_FREE;
4318         kfree(conn);
4319
4320         spin_lock_bh(&sess->conn_lock);
4321         atomic_dec(&sess->nconn);
4322         pr_debug("Decremented iSCSI connection count to %hu from node:"
4323                 " %s\n", atomic_read(&sess->nconn),
4324                 sess->sess_ops->InitiatorName);
4325         /*
4326          * Make sure that if one connection fails in an non ERL=2 iSCSI
4327          * Session that they all fail.
4328          */
4329         if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4330              !atomic_read(&sess->session_logout))
4331                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4332
4333         /*
4334          * If this was not the last connection in the session, and we are
4335          * performing session reinstatement or falling back to ERL=0, call
4336          * iscsit_stop_session() without sleeping to shutdown the other
4337          * active connections.
4338          */
4339         if (atomic_read(&sess->nconn)) {
4340                 if (!atomic_read(&sess->session_reinstatement) &&
4341                     !atomic_read(&sess->session_fall_back_to_erl0)) {
4342                         spin_unlock_bh(&sess->conn_lock);
4343                         return 0;
4344                 }
4345                 if (!atomic_read(&sess->session_stop_active)) {
4346                         atomic_set(&sess->session_stop_active, 1);
4347                         spin_unlock_bh(&sess->conn_lock);
4348                         iscsit_stop_session(sess, 0, 0);
4349                         return 0;
4350                 }
4351                 spin_unlock_bh(&sess->conn_lock);
4352                 return 0;
4353         }
4354
4355         /*
4356          * If this was the last connection in the session and one of the
4357          * following is occurring:
4358          *
4359          * Session Reinstatement is not being performed, and are falling back
4360          * to ERL=0 call iscsit_close_session().
4361          *
4362          * Session Logout was requested.  iscsit_close_session() will be called
4363          * elsewhere.
4364          *
4365          * Session Continuation is not being performed, start the Time2Retain
4366          * handler and check if sleep_on_sess_wait_sem is active.
4367          */
4368         if (!atomic_read(&sess->session_reinstatement) &&
4369              atomic_read(&sess->session_fall_back_to_erl0)) {
4370                 spin_unlock_bh(&sess->conn_lock);
4371                 target_put_session(sess->se_sess);
4372
4373                 return 0;
4374         } else if (atomic_read(&sess->session_logout)) {
4375                 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4376                 sess->session_state = TARG_SESS_STATE_FREE;
4377                 spin_unlock_bh(&sess->conn_lock);
4378
4379                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4380                         complete(&sess->session_wait_comp);
4381
4382                 return 0;
4383         } else {
4384                 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4385                 sess->session_state = TARG_SESS_STATE_FAILED;
4386
4387                 if (!atomic_read(&sess->session_continuation)) {
4388                         spin_unlock_bh(&sess->conn_lock);
4389                         iscsit_start_time2retain_handler(sess);
4390                 } else
4391                         spin_unlock_bh(&sess->conn_lock);
4392
4393                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4394                         complete(&sess->session_wait_comp);
4395
4396                 return 0;
4397         }
4398         spin_unlock_bh(&sess->conn_lock);
4399
4400         return 0;
4401 }
4402
4403 int iscsit_close_session(struct iscsi_session *sess)
4404 {
4405         struct iscsi_portal_group *tpg = sess->tpg;
4406         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4407
4408         if (atomic_read(&sess->nconn)) {
4409                 pr_err("%d connection(s) still exist for iSCSI session"
4410                         " to %s\n", atomic_read(&sess->nconn),
4411                         sess->sess_ops->InitiatorName);
4412                 BUG();
4413         }
4414
4415         spin_lock_bh(&se_tpg->session_lock);
4416         atomic_set(&sess->session_logout, 1);
4417         atomic_set(&sess->session_reinstatement, 1);
4418         iscsit_stop_time2retain_timer(sess);
4419         spin_unlock_bh(&se_tpg->session_lock);
4420
4421         /*
4422          * transport_deregister_session_configfs() will clear the
4423          * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4424          * can be setting it again with __transport_register_session() in
4425          * iscsi_post_login_handler() again after the iscsit_stop_session()
4426          * completes in iscsi_np context.
4427          */
4428         transport_deregister_session_configfs(sess->se_sess);
4429
4430         /*
4431          * If any other processes are accessing this session pointer we must
4432          * wait until they have completed.  If we are in an interrupt (the
4433          * time2retain handler) and contain and active session usage count we
4434          * restart the timer and exit.
4435          */
4436         if (!in_interrupt()) {
4437                 if (iscsit_check_session_usage_count(sess) == 1)
4438                         iscsit_stop_session(sess, 1, 1);
4439         } else {
4440                 if (iscsit_check_session_usage_count(sess) == 2) {
4441                         atomic_set(&sess->session_logout, 0);
4442                         iscsit_start_time2retain_handler(sess);
4443                         return 0;
4444                 }
4445         }
4446
4447         transport_deregister_session(sess->se_sess);
4448
4449         if (sess->sess_ops->ErrorRecoveryLevel == 2)
4450                 iscsit_free_connection_recovery_entires(sess);
4451
4452         iscsit_free_all_ooo_cmdsns(sess);
4453
4454         spin_lock_bh(&se_tpg->session_lock);
4455         pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4456         sess->session_state = TARG_SESS_STATE_FREE;
4457         pr_debug("Released iSCSI session from node: %s\n",
4458                         sess->sess_ops->InitiatorName);
4459         tpg->nsessions--;
4460         if (tpg->tpg_tiqn)
4461                 tpg->tpg_tiqn->tiqn_nsessions--;
4462
4463         pr_debug("Decremented number of active iSCSI Sessions on"
4464                 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4465
4466         spin_lock(&sess_idr_lock);
4467         idr_remove(&sess_idr, sess->session_index);
4468         spin_unlock(&sess_idr_lock);
4469
4470         kfree(sess->sess_ops);
4471         sess->sess_ops = NULL;
4472         spin_unlock_bh(&se_tpg->session_lock);
4473
4474         kfree(sess);
4475         return 0;
4476 }
4477
4478 static void iscsit_logout_post_handler_closesession(
4479         struct iscsi_conn *conn)
4480 {
4481         struct iscsi_session *sess = conn->sess;
4482
4483         iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4484         iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4485
4486         atomic_set(&conn->conn_logout_remove, 0);
4487         complete(&conn->conn_logout_comp);
4488
4489         iscsit_dec_conn_usage_count(conn);
4490         iscsit_stop_session(sess, 1, 1);
4491         iscsit_dec_session_usage_count(sess);
4492         target_put_session(sess->se_sess);
4493 }
4494
4495 static void iscsit_logout_post_handler_samecid(
4496         struct iscsi_conn *conn)
4497 {
4498         iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4499         iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4500
4501         atomic_set(&conn->conn_logout_remove, 0);
4502         complete(&conn->conn_logout_comp);
4503
4504         iscsit_cause_connection_reinstatement(conn, 1);
4505         iscsit_dec_conn_usage_count(conn);
4506 }
4507
4508 static void iscsit_logout_post_handler_diffcid(
4509         struct iscsi_conn *conn,
4510         u16 cid)
4511 {
4512         struct iscsi_conn *l_conn;
4513         struct iscsi_session *sess = conn->sess;
4514
4515         if (!sess)
4516                 return;
4517
4518         spin_lock_bh(&sess->conn_lock);
4519         list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4520                 if (l_conn->cid == cid) {
4521                         iscsit_inc_conn_usage_count(l_conn);
4522                         break;
4523                 }
4524         }
4525         spin_unlock_bh(&sess->conn_lock);
4526
4527         if (!l_conn)
4528                 return;
4529
4530         if (l_conn->sock)
4531                 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4532
4533         spin_lock_bh(&l_conn->state_lock);
4534         pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4535         l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4536         spin_unlock_bh(&l_conn->state_lock);
4537
4538         iscsit_cause_connection_reinstatement(l_conn, 1);
4539         iscsit_dec_conn_usage_count(l_conn);
4540 }
4541
4542 /*
4543  *      Return of 0 causes the TX thread to restart.
4544  */
4545 int iscsit_logout_post_handler(
4546         struct iscsi_cmd *cmd,
4547         struct iscsi_conn *conn)
4548 {
4549         int ret = 0;
4550
4551         switch (cmd->logout_reason) {
4552         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4553                 switch (cmd->logout_response) {
4554                 case ISCSI_LOGOUT_SUCCESS:
4555                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4556                 default:
4557                         iscsit_logout_post_handler_closesession(conn);
4558                         break;
4559                 }
4560                 ret = 0;
4561                 break;
4562         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4563                 if (conn->cid == cmd->logout_cid) {
4564                         switch (cmd->logout_response) {
4565                         case ISCSI_LOGOUT_SUCCESS:
4566                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4567                         default:
4568                                 iscsit_logout_post_handler_samecid(conn);
4569                                 break;
4570                         }
4571                         ret = 0;
4572                 } else {
4573                         switch (cmd->logout_response) {
4574                         case ISCSI_LOGOUT_SUCCESS:
4575                                 iscsit_logout_post_handler_diffcid(conn,
4576                                         cmd->logout_cid);
4577                                 break;
4578                         case ISCSI_LOGOUT_CID_NOT_FOUND:
4579                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4580                         default:
4581                                 break;
4582                         }
4583                         ret = 1;
4584                 }
4585                 break;
4586         case ISCSI_LOGOUT_REASON_RECOVERY:
4587                 switch (cmd->logout_response) {
4588                 case ISCSI_LOGOUT_SUCCESS:
4589                 case ISCSI_LOGOUT_CID_NOT_FOUND:
4590                 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4591                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4592                 default:
4593                         break;
4594                 }
4595                 ret = 1;
4596                 break;
4597         default:
4598                 break;
4599
4600         }
4601         return ret;
4602 }
4603 EXPORT_SYMBOL(iscsit_logout_post_handler);
4604
4605 void iscsit_fail_session(struct iscsi_session *sess)
4606 {
4607         struct iscsi_conn *conn;
4608
4609         spin_lock_bh(&sess->conn_lock);
4610         list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4611                 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4612                 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4613         }
4614         spin_unlock_bh(&sess->conn_lock);
4615
4616         pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4617         sess->session_state = TARG_SESS_STATE_FAILED;
4618 }
4619
4620 int iscsit_free_session(struct iscsi_session *sess)
4621 {
4622         u16 conn_count = atomic_read(&sess->nconn);
4623         struct iscsi_conn *conn, *conn_tmp = NULL;
4624         int is_last;
4625
4626         spin_lock_bh(&sess->conn_lock);
4627         atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4628
4629         list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4630                         conn_list) {
4631                 if (conn_count == 0)
4632                         break;
4633
4634                 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4635                         is_last = 1;
4636                 } else {
4637                         iscsit_inc_conn_usage_count(conn_tmp);
4638                         is_last = 0;
4639                 }
4640                 iscsit_inc_conn_usage_count(conn);
4641
4642                 spin_unlock_bh(&sess->conn_lock);
4643                 iscsit_cause_connection_reinstatement(conn, 1);
4644                 spin_lock_bh(&sess->conn_lock);
4645
4646                 iscsit_dec_conn_usage_count(conn);
4647                 if (is_last == 0)
4648                         iscsit_dec_conn_usage_count(conn_tmp);
4649
4650                 conn_count--;
4651         }
4652
4653         if (atomic_read(&sess->nconn)) {
4654                 spin_unlock_bh(&sess->conn_lock);
4655                 wait_for_completion(&sess->session_wait_comp);
4656         } else
4657                 spin_unlock_bh(&sess->conn_lock);
4658
4659         target_put_session(sess->se_sess);
4660         return 0;
4661 }
4662
4663 void iscsit_stop_session(
4664         struct iscsi_session *sess,
4665         int session_sleep,
4666         int connection_sleep)
4667 {
4668         u16 conn_count = atomic_read(&sess->nconn);
4669         struct iscsi_conn *conn, *conn_tmp = NULL;
4670         int is_last;
4671
4672         spin_lock_bh(&sess->conn_lock);
4673         if (session_sleep)
4674                 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4675
4676         if (connection_sleep) {
4677                 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4678                                 conn_list) {
4679                         if (conn_count == 0)
4680                                 break;
4681
4682                         if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4683                                 is_last = 1;
4684                         } else {
4685                                 iscsit_inc_conn_usage_count(conn_tmp);
4686                                 is_last = 0;
4687                         }
4688                         iscsit_inc_conn_usage_count(conn);
4689
4690                         spin_unlock_bh(&sess->conn_lock);
4691                         iscsit_cause_connection_reinstatement(conn, 1);
4692                         spin_lock_bh(&sess->conn_lock);
4693
4694                         iscsit_dec_conn_usage_count(conn);
4695                         if (is_last == 0)
4696                                 iscsit_dec_conn_usage_count(conn_tmp);
4697                         conn_count--;
4698                 }
4699         } else {
4700                 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4701                         iscsit_cause_connection_reinstatement(conn, 0);
4702         }
4703
4704         if (session_sleep && atomic_read(&sess->nconn)) {
4705                 spin_unlock_bh(&sess->conn_lock);
4706                 wait_for_completion(&sess->session_wait_comp);
4707         } else
4708                 spin_unlock_bh(&sess->conn_lock);
4709 }
4710
4711 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4712 {
4713         struct iscsi_session *sess;
4714         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4715         struct se_session *se_sess, *se_sess_tmp;
4716         int session_count = 0;
4717
4718         spin_lock_bh(&se_tpg->session_lock);
4719         if (tpg->nsessions && !force) {
4720                 spin_unlock_bh(&se_tpg->session_lock);
4721                 return -1;
4722         }
4723
4724         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4725                         sess_list) {
4726                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4727
4728                 spin_lock(&sess->conn_lock);
4729                 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4730                     atomic_read(&sess->session_logout) ||
4731                     (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4732                         spin_unlock(&sess->conn_lock);
4733                         continue;
4734                 }
4735                 atomic_set(&sess->session_reinstatement, 1);
4736                 spin_unlock(&sess->conn_lock);
4737                 spin_unlock_bh(&se_tpg->session_lock);
4738
4739                 iscsit_free_session(sess);
4740                 spin_lock_bh(&se_tpg->session_lock);
4741
4742                 session_count++;
4743         }
4744         spin_unlock_bh(&se_tpg->session_lock);
4745
4746         pr_debug("Released %d iSCSI Session(s) from Target Portal"
4747                         " Group: %hu\n", session_count, tpg->tpgt);
4748         return 0;
4749 }
4750
4751 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4752 MODULE_VERSION("4.1.x");
4753 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4754 MODULE_LICENSE("GPL");
4755
4756 module_init(iscsi_target_init_module);
4757 module_exit(iscsi_target_cleanup_module);