drivers/target/iscsi/iscsi_target.c

   1 /*******************************************************************************
   2  * This file contains main functions related to the iSCSI Target Core Driver.
   3  *
   4  * \u00a9 Copyright 2007-2011 RisingTide Systems LLC.
   5  *
   6  * Licensed to the Linux Foundation under the General Public License (GPL) version 2.
   7  *
   8  * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  ******************************************************************************/
  20
  21 #include <linux/string.h>
  22 #include <linux/kthread.h>
  23 #include <linux/crypto.h>
  24 #include <linux/completion.h>
  25 #include <linux/module.h>
  26 #include <linux/idr.h>
  27 #include <asm/unaligned.h>
  28 #include <scsi/scsi_device.h>
  29 #include <scsi/iscsi_proto.h>
  30 #include <scsi/scsi_tcq.h>
  31 #include <target/target_core_base.h>
  32 #include <target/target_core_fabric.h>
  33 #include <target/target_core_configfs.h>
  34
  35 #include "iscsi_target_core.h"
  36 #include "iscsi_target_parameters.h"
  37 #include "iscsi_target_seq_pdu_list.h"
  38 #include "iscsi_target_tq.h"
  39 #include "iscsi_target_configfs.h"
  40 #include "iscsi_target_datain_values.h"
  41 #include "iscsi_target_erl0.h"
  42 #include "iscsi_target_erl1.h"
  43 #include "iscsi_target_erl2.h"
  44 #include "iscsi_target_login.h"
  45 #include "iscsi_target_tmr.h"
  46 #include "iscsi_target_tpg.h"
  47 #include "iscsi_target_util.h"
  48 #include "iscsi_target.h"
  49 #include "iscsi_target_device.h"
  50 #include "iscsi_target_stat.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_cmd_cache;
  65 struct kmem_cache *lio_qr_cache;
  66 struct kmem_cache *lio_dr_cache;
  67 struct kmem_cache *lio_ooo_cache;
  68 struct kmem_cache *lio_r2t_cache;
  69
  70 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
  71                         unsigned char *buf, u32);
  72 static int iscsit_logout_post_handler(struct iscsi_cmd *, struct iscsi_conn *);
  73
  74 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
  75 {
  76         struct iscsi_tiqn *tiqn = NULL;
  77
  78         spin_lock(&tiqn_lock);
  79         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
  80                 if (!strcmp(tiqn->tiqn, buf)) {
  81
  82                         spin_lock(&tiqn->tiqn_state_lock);
  83                         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
  84                                 tiqn->tiqn_access_count++;
  85                                 spin_unlock(&tiqn->tiqn_state_lock);
  86                                 spin_unlock(&tiqn_lock);
  87                                 return tiqn;
  88                         }
  89                         spin_unlock(&tiqn->tiqn_state_lock);
  90                 }
  91         }
  92         spin_unlock(&tiqn_lock);
  93
  94         return NULL;
  95 }
  96
  97 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
  98 {
  99         spin_lock(&tiqn->tiqn_state_lock);
 100         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
 101                 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
 102                 spin_unlock(&tiqn->tiqn_state_lock);
 103                 return 0;
 104         }
 105         spin_unlock(&tiqn->tiqn_state_lock);
 106
 107         return -1;
 108 }
 109
 110 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
 111 {
 112         spin_lock(&tiqn->tiqn_state_lock);
 113         tiqn->tiqn_access_count--;
 114         spin_unlock(&tiqn->tiqn_state_lock);
 115 }
 116
 117 /*
 118  * Note that IQN formatting is expected to be done in userspace, and
 119  * no explict IQN format checks are done here.
 120  */
 121 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
 122 {
 123         struct iscsi_tiqn *tiqn = NULL;
 124         int ret;
 125
 126         if (strlen(buf) >= ISCSI_IQN_LEN) {
 127                 pr_err("Target IQN exceeds %d bytes\n",
 128                                 ISCSI_IQN_LEN);
 129                 return ERR_PTR(-EINVAL);
 130         }
 131
 132         tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL);
 133         if (!tiqn) {
 134                 pr_err("Unable to allocate struct iscsi_tiqn\n");
 135                 return ERR_PTR(-ENOMEM);
 136         }
 137
 138         sprintf(tiqn->tiqn, "%s", buf);
 139         INIT_LIST_HEAD(&tiqn->tiqn_list);
 140         INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
 141         spin_lock_init(&tiqn->tiqn_state_lock);
 142         spin_lock_init(&tiqn->tiqn_tpg_lock);
 143         spin_lock_init(&tiqn->sess_err_stats.lock);
 144         spin_lock_init(&tiqn->login_stats.lock);
 145         spin_lock_init(&tiqn->logout_stats.lock);
 146
 147         if (!idr_pre_get(&tiqn_idr, GFP_KERNEL)) {
 148                 pr_err("idr_pre_get() for tiqn_idr failed\n");
 149                 kfree(tiqn);
 150                 return ERR_PTR(-ENOMEM);
 151         }
 152         tiqn->tiqn_state = TIQN_STATE_ACTIVE;
 153
 154         spin_lock(&tiqn_lock);
 155         ret = idr_get_new(&tiqn_idr, NULL, &tiqn->tiqn_index);
 156         if (ret < 0) {
 157                 pr_err("idr_get_new() failed for tiqn->tiqn_index\n");
 158                 spin_unlock(&tiqn_lock);
 159                 kfree(tiqn);
 160                 return ERR_PTR(ret);
 161         }
 162         list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
 163         spin_unlock(&tiqn_lock);
 164
 165         pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
 166
 167         return tiqn;
 168
 169 }
 170
 171 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
 172 {
 173         /*
 174          * Wait for accesses to said struct iscsi_tiqn to end.
 175          */
 176         spin_lock(&tiqn->tiqn_state_lock);
 177         while (tiqn->tiqn_access_count != 0) {
 178                 spin_unlock(&tiqn->tiqn_state_lock);
 179                 msleep(10);
 180                 spin_lock(&tiqn->tiqn_state_lock);
 181         }
 182         spin_unlock(&tiqn->tiqn_state_lock);
 183 }
 184
 185 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
 186 {
 187         /*
 188          * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
 189          * while holding tiqn->tiqn_state_lock.  This means that all subsequent
 190          * attempts to access this struct iscsi_tiqn will fail from both transport
 191          * fabric and control code paths.
 192          */
 193         if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
 194                 pr_err("iscsit_set_tiqn_shutdown() failed\n");
 195                 return;
 196         }
 197
 198         iscsit_wait_for_tiqn(tiqn);
 199
 200         spin_lock(&tiqn_lock);
 201         list_del(&tiqn->tiqn_list);
 202         idr_remove(&tiqn_idr, tiqn->tiqn_index);
 203         spin_unlock(&tiqn_lock);
 204
 205         pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
 206                         tiqn->tiqn);
 207         kfree(tiqn);
 208 }
 209
 210 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
 211 {
 212         int ret;
 213         /*
 214          * Determine if the network portal is accepting storage traffic.
 215          */
 216         spin_lock_bh(&np->np_thread_lock);
 217         if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 218                 spin_unlock_bh(&np->np_thread_lock);
 219                 return -1;
 220         }
 221         if (np->np_login_tpg) {
 222                 pr_err("np->np_login_tpg() is not NULL!\n");
 223                 spin_unlock_bh(&np->np_thread_lock);
 224                 return -1;
 225         }
 226         spin_unlock_bh(&np->np_thread_lock);
 227         /*
 228          * Determine if the portal group is accepting storage traffic.
 229          */
 230         spin_lock_bh(&tpg->tpg_state_lock);
 231         if (tpg->tpg_state != TPG_STATE_ACTIVE) {
 232                 spin_unlock_bh(&tpg->tpg_state_lock);
 233                 return -1;
 234         }
 235         spin_unlock_bh(&tpg->tpg_state_lock);
 236
 237         /*
 238          * Here we serialize access across the TIQN+TPG Tuple.
 239          */
 240         ret = mutex_lock_interruptible(&tpg->np_login_lock);
 241         if ((ret != 0) || signal_pending(current))
 242                 return -1;
 243
 244         spin_lock_bh(&np->np_thread_lock);
 245         np->np_login_tpg = tpg;
 246         spin_unlock_bh(&np->np_thread_lock);
 247
 248         return 0;
 249 }
 250
 251 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
 252 {
 253         struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
 254
 255         spin_lock_bh(&np->np_thread_lock);
 256         np->np_login_tpg = NULL;
 257         spin_unlock_bh(&np->np_thread_lock);
 258
 259         mutex_unlock(&tpg->np_login_lock);
 260
 261         if (tiqn)
 262                 iscsit_put_tiqn_for_login(tiqn);
 263
 264         return 0;
 265 }
 266
 267 static struct iscsi_np *iscsit_get_np(
 268         struct __kernel_sockaddr_storage *sockaddr,
 269         int network_transport)
 270 {
 271         struct sockaddr_in *sock_in, *sock_in_e;
 272         struct sockaddr_in6 *sock_in6, *sock_in6_e;
 273         struct iscsi_np *np;
 274         int ip_match = 0;
 275         u16 port;
 276
 277         spin_lock_bh(&np_lock);
 278         list_for_each_entry(np, &g_np_list, np_list) {
 279                 spin_lock(&np->np_thread_lock);
 280                 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 281                         spin_unlock(&np->np_thread_lock);
 282                         continue;
 283                 }
 284
 285                 if (sockaddr->ss_family == AF_INET6) {
 286                         sock_in6 = (struct sockaddr_in6 *)sockaddr;
 287                         sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
 288
 289                         if (!memcmp(&sock_in6->sin6_addr.in6_u,
 290                                     &sock_in6_e->sin6_addr.in6_u,
 291                                     sizeof(struct in6_addr)))
 292                                 ip_match = 1;
 293
 294                         port = ntohs(sock_in6->sin6_port);
 295                 } else {
 296                         sock_in = (struct sockaddr_in *)sockaddr;
 297                         sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
 298
 299                         if (sock_in->sin_addr.s_addr ==
 300                             sock_in_e->sin_addr.s_addr)
 301                                 ip_match = 1;
 302
 303                         port = ntohs(sock_in->sin_port);
 304                 }
 305
 306                 if ((ip_match == 1) && (np->np_port == port) &&
 307                     (np->np_network_transport == network_transport)) {
 308                         /*
 309                          * Increment the np_exports reference count now to
 310                          * prevent iscsit_del_np() below from being called
 311                          * while iscsi_tpg_add_network_portal() is called.
 312                          */
 313                         np->np_exports++;
 314                         spin_unlock(&np->np_thread_lock);
 315                         spin_unlock_bh(&np_lock);
 316                         return np;
 317                 }
 318                 spin_unlock(&np->np_thread_lock);
 319         }
 320         spin_unlock_bh(&np_lock);
 321
 322         return NULL;
 323 }
 324
 325 struct iscsi_np *iscsit_add_np(
 326         struct __kernel_sockaddr_storage *sockaddr,
 327         char *ip_str,
 328         int network_transport)
 329 {
 330         struct sockaddr_in *sock_in;
 331         struct sockaddr_in6 *sock_in6;
 332         struct iscsi_np *np;
 333         int ret;
 334         /*
 335          * Locate the existing struct iscsi_np if already active..
 336          */
 337         np = iscsit_get_np(sockaddr, network_transport);
 338         if (np)
 339                 return np;
 340
 341         np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
 342         if (!np) {
 343                 pr_err("Unable to allocate memory for struct iscsi_np\n");
 344                 return ERR_PTR(-ENOMEM);
 345         }
 346
 347         np->np_flags |= NPF_IP_NETWORK;
 348         if (sockaddr->ss_family == AF_INET6) {
 349                 sock_in6 = (struct sockaddr_in6 *)sockaddr;
 350                 snprintf(np->np_ip, IPV6_ADDRESS_SPACE, "%s", ip_str);
 351                 np->np_port = ntohs(sock_in6->sin6_port);
 352         } else {
 353                 sock_in = (struct sockaddr_in *)sockaddr;
 354                 sprintf(np->np_ip, "%s", ip_str);
 355                 np->np_port = ntohs(sock_in->sin_port);
 356         }
 357
 358         np->np_network_transport = network_transport;
 359         spin_lock_init(&np->np_thread_lock);
 360         init_completion(&np->np_restart_comp);
 361         INIT_LIST_HEAD(&np->np_list);
 362
 363         ret = iscsi_target_setup_login_socket(np, sockaddr);
 364         if (ret != 0) {
 365                 kfree(np);
 366                 return ERR_PTR(ret);
 367         }
 368
 369         np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
 370         if (IS_ERR(np->np_thread)) {
 371                 pr_err("Unable to create kthread: iscsi_np\n");
 372                 ret = PTR_ERR(np->np_thread);
 373                 kfree(np);
 374                 return ERR_PTR(ret);
 375         }
 376         /*
 377          * Increment the np_exports reference count now to prevent
 378          * iscsit_del_np() below from being run while a new call to
 379          * iscsi_tpg_add_network_portal() for a matching iscsi_np is
 380          * active.  We don't need to hold np->np_thread_lock at this
 381          * point because iscsi_np has not been added to g_np_list yet.
 382          */
 383         np->np_exports = 1;
 384
 385         spin_lock_bh(&np_lock);
 386         list_add_tail(&np->np_list, &g_np_list);
 387         spin_unlock_bh(&np_lock);
 388
 389         pr_debug("CORE[0] - Added Network Portal: %s:%hu on %s\n",
 390                 np->np_ip, np->np_port, (np->np_network_transport == ISCSI_TCP) ?
 391                 "TCP" : "SCTP");
 392
 393         return np;
 394 }
 395
 396 int iscsit_reset_np_thread(
 397         struct iscsi_np *np,
 398         struct iscsi_tpg_np *tpg_np,
 399         struct iscsi_portal_group *tpg)
 400 {
 401         spin_lock_bh(&np->np_thread_lock);
 402         if (tpg && tpg_np) {
 403                 /*
 404                  * The reset operation need only be performed when the
 405                  * passed struct iscsi_portal_group has a login in progress
 406                  * to one of the network portals.
 407                  */
 408                 if (tpg_np->tpg_np->np_login_tpg != tpg) {
 409                         spin_unlock_bh(&np->np_thread_lock);
 410                         return 0;
 411                 }
 412         }
 413         if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
 414                 spin_unlock_bh(&np->np_thread_lock);
 415                 return 0;
 416         }
 417         np->np_thread_state = ISCSI_NP_THREAD_RESET;
 418
 419         if (np->np_thread) {
 420                 spin_unlock_bh(&np->np_thread_lock);
 421                 send_sig(SIGINT, np->np_thread, 1);
 422                 wait_for_completion(&np->np_restart_comp);
 423                 spin_lock_bh(&np->np_thread_lock);
 424         }
 425         spin_unlock_bh(&np->np_thread_lock);
 426
 427         return 0;
 428 }
 429
 430 int iscsit_del_np_comm(struct iscsi_np *np)
 431 {
 432         if (np->np_socket)
 433                 sock_release(np->np_socket);
 434         return 0;
 435 }
 436
 437 int iscsit_del_np(struct iscsi_np *np)
 438 {
 439         spin_lock_bh(&np->np_thread_lock);
 440         np->np_exports--;
 441         if (np->np_exports) {
 442                 spin_unlock_bh(&np->np_thread_lock);
 443                 return 0;
 444         }
 445         np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
 446         spin_unlock_bh(&np->np_thread_lock);
 447
 448         if (np->np_thread) {
 449                 /*
 450                  * We need to send the signal to wakeup Linux/Net
 451                  * which may be sleeping in sock_accept()..
 452                  */
 453                 send_sig(SIGINT, np->np_thread, 1);
 454                 kthread_stop(np->np_thread);
 455         }
 456         iscsit_del_np_comm(np);
 457
 458         spin_lock_bh(&np_lock);
 459         list_del(&np->np_list);
 460         spin_unlock_bh(&np_lock);
 461
 462         pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n",
 463                 np->np_ip, np->np_port, (np->np_network_transport == ISCSI_TCP) ?
 464                 "TCP" : "SCTP");
 465
 466         kfree(np);
 467         return 0;
 468 }
 469
 470 static int __init iscsi_target_init_module(void)
 471 {
 472         int ret = 0;
 473
 474         pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
 475
 476         iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
 477         if (!iscsit_global) {
 478                 pr_err("Unable to allocate memory for iscsit_global\n");
 479                 return -1;
 480         }
 481         mutex_init(&auth_id_lock);
 482         spin_lock_init(&sess_idr_lock);
 483         idr_init(&tiqn_idr);
 484         idr_init(&sess_idr);
 485
 486         ret = iscsi_target_register_configfs();
 487         if (ret < 0)
 488                 goto out;
 489
 490         ret = iscsi_thread_set_init();
 491         if (ret < 0)
 492                 goto configfs_out;
 493
 494         if (iscsi_allocate_thread_sets(TARGET_THREAD_SET_COUNT) !=
 495                         TARGET_THREAD_SET_COUNT) {
 496                 pr_err("iscsi_allocate_thread_sets() returned"
 497                         " unexpected value!\n");
 498                 goto ts_out1;
 499         }
 500
 501         lio_cmd_cache = kmem_cache_create("lio_cmd_cache",
 502                         sizeof(struct iscsi_cmd), __alignof__(struct iscsi_cmd),
 503                         0, NULL);
 504         if (!lio_cmd_cache) {
 505                 pr_err("Unable to kmem_cache_create() for"
 506                                 " lio_cmd_cache\n");
 507                 goto ts_out2;
 508         }
 509
 510         lio_qr_cache = kmem_cache_create("lio_qr_cache",
 511                         sizeof(struct iscsi_queue_req),
 512                         __alignof__(struct iscsi_queue_req), 0, NULL);
 513         if (!lio_qr_cache) {
 514                 pr_err("nable to kmem_cache_create() for"
 515                                 " lio_qr_cache\n");
 516                 goto cmd_out;
 517         }
 518
 519         lio_dr_cache = kmem_cache_create("lio_dr_cache",
 520                         sizeof(struct iscsi_datain_req),
 521                         __alignof__(struct iscsi_datain_req), 0, NULL);
 522         if (!lio_dr_cache) {
 523                 pr_err("Unable to kmem_cache_create() for"
 524                                 " lio_dr_cache\n");
 525                 goto qr_out;
 526         }
 527
 528         lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
 529                         sizeof(struct iscsi_ooo_cmdsn),
 530                         __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
 531         if (!lio_ooo_cache) {
 532                 pr_err("Unable to kmem_cache_create() for"
 533                                 " lio_ooo_cache\n");
 534                 goto dr_out;
 535         }
 536
 537         lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
 538                         sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
 539                         0, NULL);
 540         if (!lio_r2t_cache) {
 541                 pr_err("Unable to kmem_cache_create() for"
 542                                 " lio_r2t_cache\n");
 543                 goto ooo_out;
 544         }
 545
 546         if (iscsit_load_discovery_tpg() < 0)
 547                 goto r2t_out;
 548
 549         return ret;
 550 r2t_out:
 551         kmem_cache_destroy(lio_r2t_cache);
 552 ooo_out:
 553         kmem_cache_destroy(lio_ooo_cache);
 554 dr_out:
 555         kmem_cache_destroy(lio_dr_cache);
 556 qr_out:
 557         kmem_cache_destroy(lio_qr_cache);
 558 cmd_out:
 559         kmem_cache_destroy(lio_cmd_cache);
 560 ts_out2:
 561         iscsi_deallocate_thread_sets();
 562 ts_out1:
 563         iscsi_thread_set_free();
 564 configfs_out:
 565         iscsi_target_deregister_configfs();
 566 out:
 567         kfree(iscsit_global);
 568         return -ENOMEM;
 569 }
 570
 571 static void __exit iscsi_target_cleanup_module(void)
 572 {
 573         iscsi_deallocate_thread_sets();
 574         iscsi_thread_set_free();
 575         iscsit_release_discovery_tpg();
 576         kmem_cache_destroy(lio_cmd_cache);
 577         kmem_cache_destroy(lio_qr_cache);
 578         kmem_cache_destroy(lio_dr_cache);
 579         kmem_cache_destroy(lio_ooo_cache);
 580         kmem_cache_destroy(lio_r2t_cache);
 581
 582         iscsi_target_deregister_configfs();
 583
 584         kfree(iscsit_global);
 585 }
 586
 587 static int iscsit_add_reject(
 588         u8 reason,
 589         int fail_conn,
 590         unsigned char *buf,
 591         struct iscsi_conn *conn)
 592 {
 593         struct iscsi_cmd *cmd;
 594         struct iscsi_reject *hdr;
 595         int ret;
 596
 597         cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
 598         if (!cmd)
 599                 return -1;
 600
 601         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 602         if (fail_conn)
 603                 cmd->cmd_flags |= ICF_REJECT_FAIL_CONN;
 604
 605         hdr     = (struct iscsi_reject *) cmd->pdu;
 606         hdr->reason = reason;
 607
 608         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 609         if (!cmd->buf_ptr) {
 610                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 611                 iscsit_release_cmd(cmd);
 612                 return -1;
 613         }
 614
 615         spin_lock_bh(&conn->cmd_lock);
 616         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 617         spin_unlock_bh(&conn->cmd_lock);
 618
 619         cmd->i_state = ISTATE_SEND_REJECT;
 620         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 621
 622         ret = wait_for_completion_interruptible(&cmd->reject_comp);
 623         if (ret != 0)
 624                 return -1;
 625
 626         return (!fail_conn) ? 0 : -1;
 627 }
 628
 629 int iscsit_add_reject_from_cmd(
 630         u8 reason,
 631         int fail_conn,
 632         int add_to_conn,
 633         unsigned char *buf,
 634         struct iscsi_cmd *cmd)
 635 {
 636         struct iscsi_conn *conn;
 637         struct iscsi_reject *hdr;
 638         int ret;
 639
 640         if (!cmd->conn) {
 641                 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
 642                                 cmd->init_task_tag);
 643                 return -1;
 644         }
 645         conn = cmd->conn;
 646
 647         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 648         if (fail_conn)
 649                 cmd->cmd_flags |= ICF_REJECT_FAIL_CONN;
 650
 651         hdr     = (struct iscsi_reject *) cmd->pdu;
 652         hdr->reason = reason;
 653
 654         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 655         if (!cmd->buf_ptr) {
 656                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 657                 iscsit_release_cmd(cmd);
 658                 return -1;
 659         }
 660
 661         if (add_to_conn) {
 662                 spin_lock_bh(&conn->cmd_lock);
 663                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 664                 spin_unlock_bh(&conn->cmd_lock);
 665         }
 666
 667         cmd->i_state = ISTATE_SEND_REJECT;
 668         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 669
 670         ret = wait_for_completion_interruptible(&cmd->reject_comp);
 671         if (ret != 0)
 672                 return -1;
 673
 674         return (!fail_conn) ? 0 : -1;
 675 }
 676
 677 /*
 678  * Map some portion of the allocated scatterlist to an iovec, suitable for
 679  * kernel sockets to copy data in/out.
 680  */
 681 static int iscsit_map_iovec(
 682         struct iscsi_cmd *cmd,
 683         struct kvec *iov,
 684         u32 data_offset,
 685         u32 data_length)
 686 {
 687         u32 i = 0;
 688         struct scatterlist *sg;
 689         unsigned int page_off;
 690
 691         /*
 692          * We know each entry in t_data_sg contains a page.
 693          */
 694         sg = &cmd->se_cmd.t_data_sg[data_offset / PAGE_SIZE];
 695         page_off = (data_offset % PAGE_SIZE);
 696
 697         cmd->first_data_sg = sg;
 698         cmd->first_data_sg_off = page_off;
 699
 700         while (data_length) {
 701                 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
 702
 703                 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
 704                 iov[i].iov_len = cur_len;
 705
 706                 data_length -= cur_len;
 707                 page_off = 0;
 708                 sg = sg_next(sg);
 709                 i++;
 710         }
 711
 712         cmd->kmapped_nents = i;
 713
 714         return i;
 715 }
 716
 717 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
 718 {
 719         u32 i;
 720         struct scatterlist *sg;
 721
 722         sg = cmd->first_data_sg;
 723
 724         for (i = 0; i < cmd->kmapped_nents; i++)
 725                 kunmap(sg_page(&sg[i]));
 726 }
 727
 728 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
 729 {
 730         struct iscsi_cmd *cmd;
 731
 732         conn->exp_statsn = exp_statsn;
 733
 734         spin_lock_bh(&conn->cmd_lock);
 735         list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
 736                 spin_lock(&cmd->istate_lock);
 737                 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
 738                     (cmd->stat_sn < exp_statsn)) {
 739                         cmd->i_state = ISTATE_REMOVE;
 740                         spin_unlock(&cmd->istate_lock);
 741                         iscsit_add_cmd_to_immediate_queue(cmd, conn,
 742                                                 cmd->i_state);
 743                         continue;
 744                 }
 745                 spin_unlock(&cmd->istate_lock);
 746         }
 747         spin_unlock_bh(&conn->cmd_lock);
 748 }
 749
 750 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
 751 {
 752         u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
 753
 754         iov_count += ISCSI_IOV_DATA_BUFFER;
 755
 756         cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
 757         if (!cmd->iov_data) {
 758                 pr_err("Unable to allocate cmd->iov_data\n");
 759                 return -ENOMEM;
 760         }
 761
 762         cmd->orig_iov_data_count = iov_count;
 763         return 0;
 764 }
 765
 766 static int iscsit_handle_scsi_cmd(
 767         struct iscsi_conn *conn,
 768         unsigned char *buf)
 769 {
 770         int     data_direction, cmdsn_ret = 0, immed_ret, ret, transport_ret;
 771         int     dump_immediate_data = 0, send_check_condition = 0, payload_length;
 772         struct iscsi_cmd        *cmd = NULL;
 773         struct iscsi_scsi_req *hdr;
 774         int iscsi_task_attr;
 775         int sam_task_attr;
 776
 777         spin_lock_bh(&conn->sess->session_stats_lock);
 778         conn->sess->cmd_pdus++;
 779         if (conn->sess->se_sess->se_node_acl) {
 780                 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
 781                 conn->sess->se_sess->se_node_acl->num_cmds++;
 782                 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
 783         }
 784         spin_unlock_bh(&conn->sess->session_stats_lock);
 785
 786         hdr                     = (struct iscsi_scsi_req *) buf;
 787         payload_length          = ntoh24(hdr->dlength);
 788         hdr->itt                = be32_to_cpu(hdr->itt);
 789         hdr->data_length        = be32_to_cpu(hdr->data_length);
 790         hdr->cmdsn              = be32_to_cpu(hdr->cmdsn);
 791         hdr->exp_statsn         = be32_to_cpu(hdr->exp_statsn);
 792
 793         /* FIXME; Add checks for AdditionalHeaderSegment */
 794
 795         if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
 796             !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
 797                 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
 798                                 " not set. Bad iSCSI Initiator.\n");
 799                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
 800                                 buf, conn);
 801         }
 802
 803         if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
 804              (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
 805                 /*
 806                  * Vmware ESX v3.0 uses a modified Cisco Initiator (v3.4.2)
 807                  * that adds support for RESERVE/RELEASE.  There is a bug
 808                  * add with this new functionality that sets R/W bits when
 809                  * neither CDB carries any READ or WRITE datapayloads.
 810                  */
 811                 if ((hdr->cdb[0] == 0x16) || (hdr->cdb[0] == 0x17)) {
 812                         hdr->flags &= ~ISCSI_FLAG_CMD_READ;
 813                         hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
 814                         goto done;
 815                 }
 816
 817                 pr_err("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
 818                         " set when Expected Data Transfer Length is 0 for"
 819                         " CDB: 0x%02x. Bad iSCSI Initiator.\n", hdr->cdb[0]);
 820                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
 821                                 buf, conn);
 822         }
 823 done:
 824
 825         if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
 826             !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
 827                 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
 828                         " MUST be set if Expected Data Transfer Length is not 0."
 829                         " Bad iSCSI Initiator\n");
 830                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
 831                                 buf, conn);
 832         }
 833
 834         if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
 835             (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
 836                 pr_err("Bidirectional operations not supported!\n");
 837                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
 838                                 buf, conn);
 839         }
 840
 841         if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
 842                 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
 843                                 " Scsi Command PDU.\n");
 844                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
 845                                 buf, conn);
 846         }
 847
 848         if (payload_length && !conn->sess->sess_ops->ImmediateData) {
 849                 pr_err("ImmediateData=No but DataSegmentLength=%u,"
 850                         " protocol error.\n", payload_length);
 851                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
 852                                 buf, conn);
 853         }
 854
 855         if ((hdr->data_length == payload_length) &&
 856             (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
 857                 pr_err("Expected Data Transfer Length and Length of"
 858                         " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
 859                         " bit is not set protocol error\n");
 860                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
 861                                 buf, conn);
 862         }
 863
 864         if (payload_length > hdr->data_length) {
 865                 pr_err("DataSegmentLength: %u is greater than"
 866                         " EDTL: %u, protocol error.\n", payload_length,
 867                                 hdr->data_length);
 868                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
 869                                 buf, conn);
 870         }
 871
 872         if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
 873                 pr_err("DataSegmentLength: %u is greater than"
 874                         " MaxRecvDataSegmentLength: %u, protocol error.\n",
 875                         payload_length, conn->conn_ops->MaxRecvDataSegmentLength);
 876                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
 877                                 buf, conn);
 878         }
 879
 880         if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
 881                 pr_err("DataSegmentLength: %u is greater than"
 882                         " FirstBurstLength: %u, protocol error.\n",
 883                         payload_length, conn->sess->sess_ops->FirstBurstLength);
 884                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
 885                                         buf, conn);
 886         }
 887
 888         data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
 889                          (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
 890                           DMA_NONE;
 891
 892         cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
 893         if (!cmd)
 894                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1,
 895                                          buf, conn);
 896
 897         cmd->data_direction = data_direction;
 898         iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
 899         /*
 900          * Figure out the SAM Task Attribute for the incoming SCSI CDB
 901          */
 902         if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
 903             (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
 904                 sam_task_attr = MSG_SIMPLE_TAG;
 905         else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
 906                 sam_task_attr = MSG_ORDERED_TAG;
 907         else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
 908                 sam_task_attr = MSG_HEAD_TAG;
 909         else if (iscsi_task_attr == ISCSI_ATTR_ACA)
 910                 sam_task_attr = MSG_ACA_TAG;
 911         else {
 912                 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
 913                         " MSG_SIMPLE_TAG\n", iscsi_task_attr);
 914                 sam_task_attr = MSG_SIMPLE_TAG;
 915         }
 916
 917         cmd->iscsi_opcode       = ISCSI_OP_SCSI_CMD;
 918         cmd->i_state            = ISTATE_NEW_CMD;
 919         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
 920         cmd->immediate_data     = (payload_length) ? 1 : 0;
 921         cmd->unsolicited_data   = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
 922                                      (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
 923         if (cmd->unsolicited_data)
 924                 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
 925
 926         conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
 927         if (hdr->flags & ISCSI_FLAG_CMD_READ) {
 928                 spin_lock_bh(&conn->sess->ttt_lock);
 929                 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
 930                 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
 931                         cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
 932                 spin_unlock_bh(&conn->sess->ttt_lock);
 933         } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
 934                 cmd->targ_xfer_tag = 0xFFFFFFFF;
 935         cmd->cmd_sn             = hdr->cmdsn;
 936         cmd->exp_stat_sn        = hdr->exp_statsn;
 937         cmd->first_burst_len    = payload_length;
 938
 939         if (cmd->data_direction == DMA_FROM_DEVICE) {
 940                 struct iscsi_datain_req *dr;
 941
 942                 dr = iscsit_allocate_datain_req();
 943                 if (!dr)
 944                         return iscsit_add_reject_from_cmd(
 945                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES,
 946                                         1, 1, buf, cmd);
 947
 948                 iscsit_attach_datain_req(cmd, dr);
 949         }
 950
 951         /*
 952          * Initialize struct se_cmd descriptor from target_core_mod infrastructure
 953          */
 954         transport_init_se_cmd(&cmd->se_cmd, &lio_target_fabric_configfs->tf_ops,
 955                         conn->sess->se_sess, hdr->data_length, cmd->data_direction,
 956                         sam_task_attr, &cmd->sense_buffer[0]);
 957
 958         pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
 959                 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
 960                 hdr->cmdsn, hdr->data_length, payload_length, conn->cid);
 961
 962         /*
 963          * The CDB is going to an se_device_t.
 964          */
 965         ret = transport_lookup_cmd_lun(&cmd->se_cmd,
 966                                        scsilun_to_int(&hdr->lun));
 967         if (ret < 0) {
 968                 if (cmd->se_cmd.scsi_sense_reason == TCM_NON_EXISTENT_LUN) {
 969                         pr_debug("Responding to non-acl'ed,"
 970                                 " non-existent or non-exported iSCSI LUN:"
 971                                 " 0x%016Lx\n", get_unaligned_le64(&hdr->lun));
 972                 }
 973                 send_check_condition = 1;
 974                 goto attach_cmd;
 975         }
 976
 977         transport_ret = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
 978         if (transport_ret == -ENOMEM) {
 979                 return iscsit_add_reject_from_cmd(
 980                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
 981                                 1, 1, buf, cmd);
 982         } else if (transport_ret < 0) {
 983                 /*
 984                  * Unsupported SAM Opcode.  CHECK_CONDITION will be sent
 985                  * in iscsit_execute_cmd() during the CmdSN OOO Execution
 986                  * Mechinism.
 987                  */
 988                 send_check_condition = 1;
 989         } else {
 990                 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0)
 991                         return iscsit_add_reject_from_cmd(
 992                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
 993                                 1, 1, buf, cmd);
 994         }
 995
 996 attach_cmd:
 997         spin_lock_bh(&conn->cmd_lock);
 998         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 999         spin_unlock_bh(&conn->cmd_lock);
1000         /*
1001          * Check if we need to delay processing because of ALUA
1002          * Active/NonOptimized primary access state..
1003          */
1004         core_alua_check_nonop_delay(&cmd->se_cmd);
1005
1006         ret = iscsit_allocate_iovecs(cmd);
1007         if (ret < 0)
1008                 return iscsit_add_reject_from_cmd(
1009                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1010                                 1, 0, buf, cmd);
1011         /*
1012          * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1013          * the Immediate Bit is not set, and no Immediate
1014          * Data is attached.
1015          *
1016          * A PDU/CmdSN carrying Immediate Data can only
1017          * be processed after the DataCRC has passed.
1018          * If the DataCRC fails, the CmdSN MUST NOT
1019          * be acknowledged. (See below)
1020          */
1021         if (!cmd->immediate_data) {
1022                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1023                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1024                         return 0;
1025                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1026                         return iscsit_add_reject_from_cmd(
1027                                 ISCSI_REASON_PROTOCOL_ERROR,
1028                                 1, 0, buf, cmd);
1029         }
1030
1031         iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1032
1033         /*
1034          * If no Immediate Data is attached, it's OK to return now.
1035          */
1036         if (!cmd->immediate_data) {
1037                 if (send_check_condition)
1038                         return 0;
1039
1040                 if (cmd->unsolicited_data) {
1041                         iscsit_set_dataout_sequence_values(cmd);
1042
1043                         spin_lock_bh(&cmd->dataout_timeout_lock);
1044                         iscsit_start_dataout_timer(cmd, cmd->conn);
1045                         spin_unlock_bh(&cmd->dataout_timeout_lock);
1046                 }
1047
1048                 return 0;
1049         }
1050
1051         /*
1052          * Early CHECK_CONDITIONs never make it to the transport processing
1053          * thread.  They are processed in CmdSN order by
1054          * iscsit_check_received_cmdsn() below.
1055          */
1056         if (send_check_condition) {
1057                 immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1058                 dump_immediate_data = 1;
1059                 goto after_immediate_data;
1060         }
1061         /*
1062          * Call directly into transport_generic_new_cmd() to perform
1063          * the backend memory allocation.
1064          */
1065         ret = transport_generic_new_cmd(&cmd->se_cmd);
1066         if (ret < 0) {
1067                 immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1068                 dump_immediate_data = 1;
1069                 goto after_immediate_data;
1070         }
1071
1072         immed_ret = iscsit_handle_immediate_data(cmd, buf, payload_length);
1073 after_immediate_data:
1074         if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1075                 /*
1076                  * A PDU/CmdSN carrying Immediate Data passed
1077                  * DataCRC, check against ExpCmdSN/MaxCmdSN if
1078                  * Immediate Bit is not set.
1079                  */
1080                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1081                 /*
1082                  * Special case for Unsupported SAM WRITE Opcodes
1083                  * and ImmediateData=Yes.
1084                  */
1085                 if (dump_immediate_data) {
1086                         if (iscsit_dump_data_payload(conn, payload_length, 1) < 0)
1087                                 return -1;
1088                 } else if (cmd->unsolicited_data) {
1089                         iscsit_set_dataout_sequence_values(cmd);
1090
1091                         spin_lock_bh(&cmd->dataout_timeout_lock);
1092                         iscsit_start_dataout_timer(cmd, cmd->conn);
1093                         spin_unlock_bh(&cmd->dataout_timeout_lock);
1094                 }
1095
1096                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1097                         return iscsit_add_reject_from_cmd(
1098                                 ISCSI_REASON_PROTOCOL_ERROR,
1099                                 1, 0, buf, cmd);
1100
1101         } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1102                 /*
1103                  * Immediate Data failed DataCRC and ERL>=1,
1104                  * silently drop this PDU and let the initiator
1105                  * plug the CmdSN gap.
1106                  *
1107                  * FIXME: Send Unsolicited NOPIN with reserved
1108                  * TTT here to help the initiator figure out
1109                  * the missing CmdSN, although they should be
1110                  * intelligent enough to determine the missing
1111                  * CmdSN and issue a retry to plug the sequence.
1112                  */
1113                 cmd->i_state = ISTATE_REMOVE;
1114                 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
1115         } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1116                 return -1;
1117
1118         return 0;
1119 }
1120
1121 static u32 iscsit_do_crypto_hash_sg(
1122         struct hash_desc *hash,
1123         struct iscsi_cmd *cmd,
1124         u32 data_offset,
1125         u32 data_length,
1126         u32 padding,
1127         u8 *pad_bytes)
1128 {
1129         u32 data_crc;
1130         u32 i;
1131         struct scatterlist *sg;
1132         unsigned int page_off;
1133
1134         crypto_hash_init(hash);
1135
1136         sg = cmd->first_data_sg;
1137         page_off = cmd->first_data_sg_off;
1138
1139         i = 0;
1140         while (data_length) {
1141                 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1142
1143                 crypto_hash_update(hash, &sg[i], cur_len);
1144
1145                 data_length -= cur_len;
1146                 page_off = 0;
1147                 i++;
1148         }
1149
1150         if (padding) {
1151                 struct scatterlist pad_sg;
1152
1153                 sg_init_one(&pad_sg, pad_bytes, padding);
1154                 crypto_hash_update(hash, &pad_sg, padding);
1155         }
1156         crypto_hash_final(hash, (u8 *) &data_crc);
1157
1158         return data_crc;
1159 }
1160
1161 static void iscsit_do_crypto_hash_buf(
1162         struct hash_desc *hash,
1163         unsigned char *buf,
1164         u32 payload_length,
1165         u32 padding,
1166         u8 *pad_bytes,
1167         u8 *data_crc)
1168 {
1169         struct scatterlist sg;
1170
1171         crypto_hash_init(hash);
1172
1173         sg_init_one(&sg, buf, payload_length);
1174         crypto_hash_update(hash, &sg, payload_length);
1175
1176         if (padding) {
1177                 sg_init_one(&sg, pad_bytes, padding);
1178                 crypto_hash_update(hash, &sg, padding);
1179         }
1180         crypto_hash_final(hash, data_crc);
1181 }
1182
1183 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1184 {
1185         int iov_ret, ooo_cmdsn = 0, ret;
1186         u8 data_crc_failed = 0;
1187         u32 checksum, iov_count = 0, padding = 0, rx_got = 0;
1188         u32 rx_size = 0, payload_length;
1189         struct iscsi_cmd *cmd = NULL;
1190         struct se_cmd *se_cmd;
1191         struct iscsi_data *hdr;
1192         struct kvec *iov;
1193         unsigned long flags;
1194
1195         hdr                     = (struct iscsi_data *) buf;
1196         payload_length          = ntoh24(hdr->dlength);
1197         hdr->itt                = be32_to_cpu(hdr->itt);
1198         hdr->ttt                = be32_to_cpu(hdr->ttt);
1199         hdr->exp_statsn         = be32_to_cpu(hdr->exp_statsn);
1200         hdr->datasn             = be32_to_cpu(hdr->datasn);
1201         hdr->offset             = be32_to_cpu(hdr->offset);
1202
1203         if (!payload_length) {
1204                 pr_err("DataOUT payload is ZERO, protocol error.\n");
1205                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1206                                         buf, conn);
1207         }
1208
1209         /* iSCSI write */
1210         spin_lock_bh(&conn->sess->session_stats_lock);
1211         conn->sess->rx_data_octets += payload_length;
1212         if (conn->sess->se_sess->se_node_acl) {
1213                 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
1214                 conn->sess->se_sess->se_node_acl->write_bytes += payload_length;
1215                 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
1216         }
1217         spin_unlock_bh(&conn->sess->session_stats_lock);
1218
1219         if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
1220                 pr_err("DataSegmentLength: %u is greater than"
1221                         " MaxRecvDataSegmentLength: %u\n", payload_length,
1222                         conn->conn_ops->MaxRecvDataSegmentLength);
1223                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1224                                         buf, conn);
1225         }
1226
1227         cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1228                         payload_length);
1229         if (!cmd)
1230                 return 0;
1231
1232         pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1233                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1234                 hdr->itt, hdr->ttt, hdr->datasn, hdr->offset,
1235                 payload_length, conn->cid);
1236
1237         if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1238                 pr_err("Command ITT: 0x%08x received DataOUT after"
1239                         " last DataOUT received, dumping payload\n",
1240                         cmd->init_task_tag);
1241                 return iscsit_dump_data_payload(conn, payload_length, 1);
1242         }
1243
1244         if (cmd->data_direction != DMA_TO_DEVICE) {
1245                 pr_err("Command ITT: 0x%08x received DataOUT for a"
1246                         " NON-WRITE command.\n", cmd->init_task_tag);
1247                 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
1248                                 1, 0, buf, cmd);
1249         }
1250         se_cmd = &cmd->se_cmd;
1251         iscsit_mod_dataout_timer(cmd);
1252
1253         if ((hdr->offset + payload_length) > cmd->se_cmd.data_length) {
1254                 pr_err("DataOut Offset: %u, Length %u greater than"
1255                         " iSCSI Command EDTL %u, protocol error.\n",
1256                         hdr->offset, payload_length, cmd->se_cmd.data_length);
1257                 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
1258                                 1, 0, buf, cmd);
1259         }
1260
1261         if (cmd->unsolicited_data) {
1262                 int dump_unsolicited_data = 0;
1263
1264                 if (conn->sess->sess_ops->InitialR2T) {
1265                         pr_err("Received unexpected unsolicited data"
1266                                 " while InitialR2T=Yes, protocol error.\n");
1267                         transport_send_check_condition_and_sense(&cmd->se_cmd,
1268                                         TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1269                         return -1;
1270                 }
1271                 /*
1272                  * Special case for dealing with Unsolicited DataOUT
1273                  * and Unsupported SAM WRITE Opcodes and SE resource allocation
1274                  * failures;
1275                  */
1276
1277                 /* Something's amiss if we're not in WRITE_PENDING state... */
1278                 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1279                 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1280                 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1281
1282                 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1283                 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) ||
1284                      (se_cmd->se_cmd_flags & SCF_SCSI_CDB_EXCEPTION))
1285                         dump_unsolicited_data = 1;
1286                 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1287
1288                 if (dump_unsolicited_data) {
1289                         /*
1290                          * Check if a delayed TASK_ABORTED status needs to
1291                          * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1292                          * received with the unsolicitied data out.
1293                          */
1294                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1295                                 iscsit_stop_dataout_timer(cmd);
1296
1297                         transport_check_aborted_status(se_cmd,
1298                                         (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1299                         return iscsit_dump_data_payload(conn, payload_length, 1);
1300                 }
1301         } else {
1302                 /*
1303                  * For the normal solicited data path:
1304                  *
1305                  * Check for a delayed TASK_ABORTED status and dump any
1306                  * incoming data out payload if one exists.  Also, when the
1307                  * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1308                  * data out sequence, we decrement outstanding_r2ts.  Once
1309                  * outstanding_r2ts reaches zero, go ahead and send the delayed
1310                  * TASK_ABORTED status.
1311                  */
1312                 if (se_cmd->transport_state & CMD_T_ABORTED) {
1313                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1314                                 if (--cmd->outstanding_r2ts < 1) {
1315                                         iscsit_stop_dataout_timer(cmd);
1316                                         transport_check_aborted_status(
1317                                                         se_cmd, 1);
1318                                 }
1319
1320                         return iscsit_dump_data_payload(conn, payload_length, 1);
1321                 }
1322         }
1323         /*
1324          * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1325          * within-command recovery checks before receiving the payload.
1326          */
1327         ret = iscsit_check_pre_dataout(cmd, buf);
1328         if (ret == DATAOUT_WITHIN_COMMAND_RECOVERY)
1329                 return 0;
1330         else if (ret == DATAOUT_CANNOT_RECOVER)
1331                 return -1;
1332
1333         rx_size += payload_length;
1334         iov = &cmd->iov_data[0];
1335
1336         iov_ret = iscsit_map_iovec(cmd, iov, hdr->offset, payload_length);
1337         if (iov_ret < 0)
1338                 return -1;
1339
1340         iov_count += iov_ret;
1341
1342         padding = ((-payload_length) & 3);
1343         if (padding != 0) {
1344                 iov[iov_count].iov_base = cmd->pad_bytes;
1345                 iov[iov_count++].iov_len = padding;
1346                 rx_size += padding;
1347                 pr_debug("Receiving %u padding bytes.\n", padding);
1348         }
1349
1350         if (conn->conn_ops->DataDigest) {
1351                 iov[iov_count].iov_base = &checksum;
1352                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1353                 rx_size += ISCSI_CRC_LEN;
1354         }
1355
1356         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1357
1358         iscsit_unmap_iovec(cmd);
1359
1360         if (rx_got != rx_size)
1361                 return -1;
1362
1363         if (conn->conn_ops->DataDigest) {
1364                 u32 data_crc;
1365
1366                 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
1367                                                     hdr->offset, payload_length, padding,
1368                                                     cmd->pad_bytes);
1369
1370                 if (checksum != data_crc) {
1371                         pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1372                                 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1373                                 " does not match computed 0x%08x\n",
1374                                 hdr->itt, hdr->offset, payload_length,
1375                                 hdr->datasn, checksum, data_crc);
1376                         data_crc_failed = 1;
1377                 } else {
1378                         pr_debug("Got CRC32C DataDigest 0x%08x for"
1379                                 " %u bytes of Data Out\n", checksum,
1380                                 payload_length);
1381                 }
1382         }
1383         /*
1384          * Increment post receive data and CRC values or perform
1385          * within-command recovery.
1386          */
1387         ret = iscsit_check_post_dataout(cmd, buf, data_crc_failed);
1388         if ((ret == DATAOUT_NORMAL) || (ret == DATAOUT_WITHIN_COMMAND_RECOVERY))
1389                 return 0;
1390         else if (ret == DATAOUT_SEND_R2T) {
1391                 iscsit_set_dataout_sequence_values(cmd);
1392                 iscsit_build_r2ts_for_cmd(cmd, conn, false);
1393         } else if (ret == DATAOUT_SEND_TO_TRANSPORT) {
1394                 /*
1395                  * Handle extra special case for out of order
1396                  * Unsolicited Data Out.
1397                  */
1398                 spin_lock_bh(&cmd->istate_lock);
1399                 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1400                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1401                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1402                 spin_unlock_bh(&cmd->istate_lock);
1403
1404                 iscsit_stop_dataout_timer(cmd);
1405                 if (ooo_cmdsn)
1406                         return 0;
1407                 target_execute_cmd(&cmd->se_cmd);
1408                 return 0;
1409         } else /* DATAOUT_CANNOT_RECOVER */
1410                 return -1;
1411
1412         return 0;
1413 }
1414
1415 static int iscsit_handle_nop_out(
1416         struct iscsi_conn *conn,
1417         unsigned char *buf)
1418 {
1419         unsigned char *ping_data = NULL;
1420         int cmdsn_ret, niov = 0, ret = 0, rx_got, rx_size;
1421         u32 checksum, data_crc, padding = 0, payload_length;
1422         struct iscsi_cmd *cmd = NULL;
1423         struct kvec *iov = NULL;
1424         struct iscsi_nopout *hdr;
1425
1426         hdr                     = (struct iscsi_nopout *) buf;
1427         payload_length          = ntoh24(hdr->dlength);
1428         hdr->itt                = be32_to_cpu(hdr->itt);
1429         hdr->ttt                = be32_to_cpu(hdr->ttt);
1430         hdr->cmdsn              = be32_to_cpu(hdr->cmdsn);
1431         hdr->exp_statsn         = be32_to_cpu(hdr->exp_statsn);
1432
1433         if ((hdr->itt == 0xFFFFFFFF) && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1434                 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1435                         " not set, protocol error.\n");
1436                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1437                                         buf, conn);
1438         }
1439
1440         if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
1441                 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1442                         " greater than MaxRecvDataSegmentLength: %u, protocol"
1443                         " error.\n", payload_length,
1444                         conn->conn_ops->MaxRecvDataSegmentLength);
1445                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1446                                         buf, conn);
1447         }
1448
1449         pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%09x,"
1450                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1451                 (hdr->itt == 0xFFFFFFFF) ? "Response" : "Request",
1452                 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1453                 payload_length);
1454         /*
1455          * This is not a response to a Unsolicited NopIN, which means
1456          * it can either be a NOPOUT ping request (with a valid ITT),
1457          * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1458          * Either way, make sure we allocate an struct iscsi_cmd, as both
1459          * can contain ping data.
1460          */
1461         if (hdr->ttt == 0xFFFFFFFF) {
1462                 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1463                 if (!cmd)
1464                         return iscsit_add_reject(
1465                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1466                                         1, buf, conn);
1467
1468                 cmd->iscsi_opcode       = ISCSI_OP_NOOP_OUT;
1469                 cmd->i_state            = ISTATE_SEND_NOPIN;
1470                 cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1471                                                 1 : 0);
1472                 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1473                 cmd->targ_xfer_tag      = 0xFFFFFFFF;
1474                 cmd->cmd_sn             = hdr->cmdsn;
1475                 cmd->exp_stat_sn        = hdr->exp_statsn;
1476                 cmd->data_direction     = DMA_NONE;
1477         }
1478
1479         if (payload_length && (hdr->ttt == 0xFFFFFFFF)) {
1480                 rx_size = payload_length;
1481                 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1482                 if (!ping_data) {
1483                         pr_err("Unable to allocate memory for"
1484                                 " NOPOUT ping data.\n");
1485                         ret = -1;
1486                         goto out;
1487                 }
1488
1489                 iov = &cmd->iov_misc[0];
1490                 iov[niov].iov_base      = ping_data;
1491                 iov[niov++].iov_len     = payload_length;
1492
1493                 padding = ((-payload_length) & 3);
1494                 if (padding != 0) {
1495                         pr_debug("Receiving %u additional bytes"
1496                                 " for padding.\n", padding);
1497                         iov[niov].iov_base      = &cmd->pad_bytes;
1498                         iov[niov++].iov_len     = padding;
1499                         rx_size += padding;
1500                 }
1501                 if (conn->conn_ops->DataDigest) {
1502                         iov[niov].iov_base      = &checksum;
1503                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
1504                         rx_size += ISCSI_CRC_LEN;
1505                 }
1506
1507                 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1508                 if (rx_got != rx_size) {
1509                         ret = -1;
1510                         goto out;
1511                 }
1512
1513                 if (conn->conn_ops->DataDigest) {
1514                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1515                                         ping_data, payload_length,
1516                                         padding, cmd->pad_bytes,
1517                                         (u8 *)&data_crc);
1518
1519                         if (checksum != data_crc) {
1520                                 pr_err("Ping data CRC32C DataDigest"
1521                                 " 0x%08x does not match computed 0x%08x\n",
1522                                         checksum, data_crc);
1523                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1524                                         pr_err("Unable to recover from"
1525                                         " NOPOUT Ping DataCRC failure while in"
1526                                                 " ERL=0.\n");
1527                                         ret = -1;
1528                                         goto out;
1529                                 } else {
1530                                         /*
1531                                          * Silently drop this PDU and let the
1532                                          * initiator plug the CmdSN gap.
1533                                          */
1534                                         pr_debug("Dropping NOPOUT"
1535                                         " Command CmdSN: 0x%08x due to"
1536                                         " DataCRC error.\n", hdr->cmdsn);
1537                                         ret = 0;
1538                                         goto out;
1539                                 }
1540                         } else {
1541                                 pr_debug("Got CRC32C DataDigest"
1542                                 " 0x%08x for %u bytes of ping data.\n",
1543                                         checksum, payload_length);
1544                         }
1545                 }
1546
1547                 ping_data[payload_length] = '\0';
1548                 /*
1549                  * Attach ping data to struct iscsi_cmd->buf_ptr.
1550                  */
1551                 cmd->buf_ptr = ping_data;
1552                 cmd->buf_ptr_size = payload_length;
1553
1554                 pr_debug("Got %u bytes of NOPOUT ping"
1555                         " data.\n", payload_length);
1556                 pr_debug("Ping Data: \"%s\"\n", ping_data);
1557         }
1558
1559         if (hdr->itt != 0xFFFFFFFF) {
1560                 if (!cmd) {
1561                         pr_err("Checking CmdSN for NOPOUT,"
1562                                 " but cmd is NULL!\n");
1563                         return -1;
1564                 }
1565                 /*
1566                  * Initiator is expecting a NopIN ping reply,
1567                  */
1568                 spin_lock_bh(&conn->cmd_lock);
1569                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1570                 spin_unlock_bh(&conn->cmd_lock);
1571
1572                 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1573
1574                 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1575                         iscsit_add_cmd_to_response_queue(cmd, conn,
1576                                         cmd->i_state);
1577                         return 0;
1578                 }
1579
1580                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1581                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1582                         ret = 0;
1583                         goto ping_out;
1584                 }
1585                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1586                         return iscsit_add_reject_from_cmd(
1587                                         ISCSI_REASON_PROTOCOL_ERROR,
1588                                         1, 0, buf, cmd);
1589
1590                 return 0;
1591         }
1592
1593         if (hdr->ttt != 0xFFFFFFFF) {
1594                 /*
1595                  * This was a response to a unsolicited NOPIN ping.
1596                  */
1597                 cmd = iscsit_find_cmd_from_ttt(conn, hdr->ttt);
1598                 if (!cmd)
1599                         return -1;
1600
1601                 iscsit_stop_nopin_response_timer(conn);
1602
1603                 cmd->i_state = ISTATE_REMOVE;
1604                 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
1605                 iscsit_start_nopin_timer(conn);
1606         } else {
1607                 /*
1608                  * Initiator is not expecting a NOPIN is response.
1609                  * Just ignore for now.
1610                  *
1611                  * iSCSI v19-91 10.18
1612                  * "A NOP-OUT may also be used to confirm a changed
1613                  *  ExpStatSN if another PDU will not be available
1614                  *  for a long time."
1615                  */
1616                 ret = 0;
1617                 goto out;
1618         }
1619
1620         return 0;
1621 out:
1622         if (cmd)
1623                 iscsit_release_cmd(cmd);
1624 ping_out:
1625         kfree(ping_data);
1626         return ret;
1627 }
1628
1629 static int iscsit_handle_task_mgt_cmd(
1630         struct iscsi_conn *conn,
1631         unsigned char *buf)
1632 {
1633         struct iscsi_cmd *cmd;
1634         struct se_tmr_req *se_tmr;
1635         struct iscsi_tmr_req *tmr_req;
1636         struct iscsi_tm *hdr;
1637         int out_of_order_cmdsn = 0;
1638         int ret;
1639         u8 function;
1640
1641         hdr                     = (struct iscsi_tm *) buf;
1642         hdr->itt                = be32_to_cpu(hdr->itt);
1643         hdr->rtt                = be32_to_cpu(hdr->rtt);
1644         hdr->cmdsn              = be32_to_cpu(hdr->cmdsn);
1645         hdr->exp_statsn         = be32_to_cpu(hdr->exp_statsn);
1646         hdr->refcmdsn           = be32_to_cpu(hdr->refcmdsn);
1647         hdr->exp_datasn         = be32_to_cpu(hdr->exp_datasn);
1648         hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1649         function = hdr->flags;
1650
1651         pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1652                 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1653                 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1654                 hdr->rtt, hdr->refcmdsn, conn->cid);
1655
1656         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1657             ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1658              (hdr->rtt != ISCSI_RESERVED_TAG))) {
1659                 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1660                 hdr->rtt = ISCSI_RESERVED_TAG;
1661         }
1662
1663         if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1664                         !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1665                 pr_err("Task Management Request TASK_REASSIGN not"
1666                         " issued as immediate command, bad iSCSI Initiator"
1667                                 "implementation\n");
1668                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1669                                         buf, conn);
1670         }
1671         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1672             (hdr->refcmdsn != ISCSI_RESERVED_TAG))
1673                 hdr->refcmdsn = ISCSI_RESERVED_TAG;
1674
1675         cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1676         if (!cmd)
1677                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1678                                          1, buf, conn);
1679
1680         cmd->data_direction = DMA_NONE;
1681
1682         cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1683         if (!cmd->tmr_req) {
1684                 pr_err("Unable to allocate memory for"
1685                         " Task Management command!\n");
1686                 return iscsit_add_reject_from_cmd(
1687                         ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1688                         1, 1, buf, cmd);
1689         }
1690
1691         /*
1692          * TASK_REASSIGN for ERL=2 / connection stays inside of
1693          * LIO-Target $FABRIC_MOD
1694          */
1695         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1696
1697                 u8 tcm_function;
1698                 int ret;
1699
1700                 transport_init_se_cmd(&cmd->se_cmd,
1701                                       &lio_target_fabric_configfs->tf_ops,
1702                                       conn->sess->se_sess, 0, DMA_NONE,
1703                                       MSG_SIMPLE_TAG, &cmd->sense_buffer[0]);
1704
1705                 switch (function) {
1706                 case ISCSI_TM_FUNC_ABORT_TASK:
1707                         tcm_function = TMR_ABORT_TASK;
1708                         break;
1709                 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1710                         tcm_function = TMR_ABORT_TASK_SET;
1711                         break;
1712                 case ISCSI_TM_FUNC_CLEAR_ACA:
1713                         tcm_function = TMR_CLEAR_ACA;
1714                         break;
1715                 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1716                         tcm_function = TMR_CLEAR_TASK_SET;
1717                         break;
1718                 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1719                         tcm_function = TMR_LUN_RESET;
1720                         break;
1721                 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1722                         tcm_function = TMR_TARGET_WARM_RESET;
1723                         break;
1724                 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1725                         tcm_function = TMR_TARGET_COLD_RESET;
1726                         break;
1727                 default:
1728                         pr_err("Unknown iSCSI TMR Function:"
1729                                " 0x%02x\n", function);
1730                         return iscsit_add_reject_from_cmd(
1731                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1732                                 1, 1, buf, cmd);
1733                 }
1734
1735                 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req,
1736                                          tcm_function, GFP_KERNEL);
1737                 if (ret < 0)
1738                         return iscsit_add_reject_from_cmd(
1739                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1740                                 1, 1, buf, cmd);
1741
1742                 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
1743         }
1744
1745         cmd->iscsi_opcode       = ISCSI_OP_SCSI_TMFUNC;
1746         cmd->i_state            = ISTATE_SEND_TASKMGTRSP;
1747         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1748         cmd->init_task_tag      = hdr->itt;
1749         cmd->targ_xfer_tag      = 0xFFFFFFFF;
1750         cmd->cmd_sn             = hdr->cmdsn;
1751         cmd->exp_stat_sn        = hdr->exp_statsn;
1752         se_tmr                  = cmd->se_cmd.se_tmr_req;
1753         tmr_req                 = cmd->tmr_req;
1754         /*
1755          * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1756          */
1757         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1758                 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
1759                                                scsilun_to_int(&hdr->lun));
1760                 if (ret < 0) {
1761                         cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1762                         se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1763                         goto attach;
1764                 }
1765         }
1766
1767         switch (function) {
1768         case ISCSI_TM_FUNC_ABORT_TASK:
1769                 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
1770                 if (se_tmr->response != ISCSI_TMF_RSP_COMPLETE) {
1771                         cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1772                         goto attach;
1773                 }
1774                 break;
1775         case ISCSI_TM_FUNC_ABORT_TASK_SET:
1776         case ISCSI_TM_FUNC_CLEAR_ACA:
1777         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1778         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1779                 break;
1780         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1781                 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
1782                         cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1783                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1784                         goto attach;
1785                 }
1786                 break;
1787         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1788                 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
1789                         cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1790                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1791                         goto attach;
1792                 }
1793                 break;
1794         case ISCSI_TM_FUNC_TASK_REASSIGN:
1795                 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1796                 /*
1797                  * Perform sanity checks on the ExpDataSN only if the
1798                  * TASK_REASSIGN was successful.
1799                  */
1800                 if (se_tmr->response != ISCSI_TMF_RSP_COMPLETE)
1801                         break;
1802
1803                 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1804                         return iscsit_add_reject_from_cmd(
1805                                         ISCSI_REASON_BOOKMARK_INVALID, 1, 1,
1806                                         buf, cmd);
1807                 break;
1808         default:
1809                 pr_err("Unknown TMR function: 0x%02x, protocol"
1810                         " error.\n", function);
1811                 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1812                 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1813                 goto attach;
1814         }
1815
1816         if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1817             (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1818                 se_tmr->call_transport = 1;
1819 attach:
1820         spin_lock_bh(&conn->cmd_lock);
1821         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1822         spin_unlock_bh(&conn->cmd_lock);
1823
1824         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1825                 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1826                 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1827                         out_of_order_cmdsn = 1;
1828                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1829                         return 0;
1830                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1831                         return iscsit_add_reject_from_cmd(
1832                                         ISCSI_REASON_PROTOCOL_ERROR,
1833                                         1, 0, buf, cmd);
1834         }
1835         iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
1836
1837         if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
1838                 return 0;
1839         /*
1840          * Found the referenced task, send to transport for processing.
1841          */
1842         if (se_tmr->call_transport)
1843                 return transport_generic_handle_tmr(&cmd->se_cmd);
1844
1845         /*
1846          * Could not find the referenced LUN, task, or Task Management
1847          * command not authorized or supported.  Change state and
1848          * let the tx_thread send the response.
1849          *
1850          * For connection recovery, this is also the default action for
1851          * TMR TASK_REASSIGN.
1852          */
1853         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1854         return 0;
1855 }
1856
1857 /* #warning FIXME: Support Text Command parameters besides SendTargets */
1858 static int iscsit_handle_text_cmd(
1859         struct iscsi_conn *conn,
1860         unsigned char *buf)
1861 {
1862         char *text_ptr, *text_in;
1863         int cmdsn_ret, niov = 0, rx_got, rx_size;
1864         u32 checksum = 0, data_crc = 0, payload_length;
1865         u32 padding = 0, pad_bytes = 0, text_length = 0;
1866         struct iscsi_cmd *cmd;
1867         struct kvec iov[3];
1868         struct iscsi_text *hdr;
1869
1870         hdr                     = (struct iscsi_text *) buf;
1871         payload_length          = ntoh24(hdr->dlength);
1872         hdr->itt                = be32_to_cpu(hdr->itt);
1873         hdr->ttt                = be32_to_cpu(hdr->ttt);
1874         hdr->cmdsn              = be32_to_cpu(hdr->cmdsn);
1875         hdr->exp_statsn         = be32_to_cpu(hdr->exp_statsn);
1876
1877         if (payload_length > conn->conn_ops->MaxRecvDataSegmentLength) {
1878                 pr_err("Unable to accept text parameter length: %u"
1879                         "greater than MaxRecvDataSegmentLength %u.\n",
1880                        payload_length, conn->conn_ops->MaxRecvDataSegmentLength);
1881                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1882                                         buf, conn);
1883         }
1884
1885         pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1886                 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1887                 hdr->exp_statsn, payload_length);
1888
1889         rx_size = text_length = payload_length;
1890         if (text_length) {
1891                 text_in = kzalloc(text_length, GFP_KERNEL);
1892                 if (!text_in) {
1893                         pr_err("Unable to allocate memory for"
1894                                 " incoming text parameters\n");
1895                         return -1;
1896                 }
1897
1898                 memset(iov, 0, 3 * sizeof(struct kvec));
1899                 iov[niov].iov_base      = text_in;
1900                 iov[niov++].iov_len     = text_length;
1901
1902                 padding = ((-payload_length) & 3);
1903                 if (padding != 0) {
1904                         iov[niov].iov_base = &pad_bytes;
1905                         iov[niov++].iov_len  = padding;
1906                         rx_size += padding;
1907                         pr_debug("Receiving %u additional bytes"
1908                                         " for padding.\n", padding);
1909                 }
1910                 if (conn->conn_ops->DataDigest) {
1911                         iov[niov].iov_base      = &checksum;
1912                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
1913                         rx_size += ISCSI_CRC_LEN;
1914                 }
1915
1916                 rx_got = rx_data(conn, &iov[0], niov, rx_size);
1917                 if (rx_got != rx_size) {
1918                         kfree(text_in);
1919                         return -1;
1920                 }
1921
1922                 if (conn->conn_ops->DataDigest) {
1923                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1924                                         text_in, text_length,
1925                                         padding, (u8 *)&pad_bytes,
1926                                         (u8 *)&data_crc);
1927
1928                         if (checksum != data_crc) {
1929                                 pr_err("Text data CRC32C DataDigest"
1930                                         " 0x%08x does not match computed"
1931                                         " 0x%08x\n", checksum, data_crc);
1932                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1933                                         pr_err("Unable to recover from"
1934                                         " Text Data digest failure while in"
1935                                                 " ERL=0.\n");
1936                                         kfree(text_in);
1937                                         return -1;
1938                                 } else {
1939                                         /*
1940                                          * Silently drop this PDU and let the
1941                                          * initiator plug the CmdSN gap.
1942                                          */
1943                                         pr_debug("Dropping Text"
1944                                         " Command CmdSN: 0x%08x due to"
1945                                         " DataCRC error.\n", hdr->cmdsn);
1946                                         kfree(text_in);
1947                                         return 0;
1948                                 }
1949                         } else {
1950                                 pr_debug("Got CRC32C DataDigest"
1951                                         " 0x%08x for %u bytes of text data.\n",
1952                                                 checksum, text_length);
1953                         }
1954                 }
1955                 text_in[text_length - 1] = '\0';
1956                 pr_debug("Successfully read %d bytes of text"
1957                                 " data.\n", text_length);
1958
1959                 if (strncmp("SendTargets", text_in, 11) != 0) {
1960                         pr_err("Received Text Data that is not"
1961                                 " SendTargets, cannot continue.\n");
1962                         kfree(text_in);
1963                         return -1;
1964                 }
1965                 text_ptr = strchr(text_in, '=');
1966                 if (!text_ptr) {
1967                         pr_err("No \"=\" separator found in Text Data,"
1968                                 "  cannot continue.\n");
1969                         kfree(text_in);
1970                         return -1;
1971                 }
1972                 if (strncmp("=All", text_ptr, 4) != 0) {
1973                         pr_err("Unable to locate All value for"
1974                                 " SendTargets key,  cannot continue.\n");
1975                         kfree(text_in);
1976                         return -1;
1977                 }
1978 /*#warning Support SendTargets=(iSCSI Target Name/Nothing) values. */
1979                 kfree(text_in);
1980         }
1981
1982         cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1983         if (!cmd)
1984                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1985                                         1, buf, conn);
1986
1987         cmd->iscsi_opcode       = ISCSI_OP_TEXT;
1988         cmd->i_state            = ISTATE_SEND_TEXTRSP;
1989         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1990         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
1991         cmd->targ_xfer_tag      = 0xFFFFFFFF;
1992         cmd->cmd_sn             = hdr->cmdsn;
1993         cmd->exp_stat_sn        = hdr->exp_statsn;
1994         cmd->data_direction     = DMA_NONE;
1995
1996         spin_lock_bh(&conn->cmd_lock);
1997         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1998         spin_unlock_bh(&conn->cmd_lock);
1999
2000         iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
2001
2002         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2003                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
2004                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2005                         return iscsit_add_reject_from_cmd(
2006                                         ISCSI_REASON_PROTOCOL_ERROR,
2007                                         1, 0, buf, cmd);
2008
2009                 return 0;
2010         }
2011
2012         return iscsit_execute_cmd(cmd, 0);
2013 }
2014
2015 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2016 {
2017         struct iscsi_conn *conn_p;
2018         struct iscsi_session *sess = conn->sess;
2019
2020         pr_debug("Received logout request CLOSESESSION on CID: %hu"
2021                 " for SID: %u.\n", conn->cid, conn->sess->sid);
2022
2023         atomic_set(&sess->session_logout, 1);
2024         atomic_set(&conn->conn_logout_remove, 1);
2025         conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2026
2027         iscsit_inc_conn_usage_count(conn);
2028         iscsit_inc_session_usage_count(sess);
2029
2030         spin_lock_bh(&sess->conn_lock);
2031         list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2032                 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2033                         continue;
2034
2035                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2036                 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2037         }
2038         spin_unlock_bh(&sess->conn_lock);
2039
2040         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2041
2042         return 0;
2043 }
2044
2045 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2046 {
2047         struct iscsi_conn *l_conn;
2048         struct iscsi_session *sess = conn->sess;
2049
2050         pr_debug("Received logout request CLOSECONNECTION for CID:"
2051                 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2052
2053         /*
2054          * A Logout Request with a CLOSECONNECTION reason code for a CID
2055          * can arrive on a connection with a differing CID.
2056          */
2057         if (conn->cid == cmd->logout_cid) {
2058                 spin_lock_bh(&conn->state_lock);
2059                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2060                 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2061
2062                 atomic_set(&conn->conn_logout_remove, 1);
2063                 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2064                 iscsit_inc_conn_usage_count(conn);
2065
2066                 spin_unlock_bh(&conn->state_lock);
2067         } else {
2068                 /*
2069                  * Handle all different cid CLOSECONNECTION requests in
2070                  * iscsit_logout_post_handler_diffcid() as to give enough
2071                  * time for any non immediate command's CmdSN to be
2072                  * acknowledged on the connection in question.
2073                  *
2074                  * Here we simply make sure the CID is still around.
2075                  */
2076                 l_conn = iscsit_get_conn_from_cid(sess,
2077                                 cmd->logout_cid);
2078                 if (!l_conn) {
2079                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2080                         iscsit_add_cmd_to_response_queue(cmd, conn,
2081                                         cmd->i_state);
2082                         return 0;
2083                 }
2084
2085                 iscsit_dec_conn_usage_count(l_conn);
2086         }
2087
2088         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2089
2090         return 0;
2091 }
2092
2093 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2094 {
2095         struct iscsi_session *sess = conn->sess;
2096
2097         pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2098                 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2099
2100         if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2101                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2102                         " while ERL!=2.\n");
2103                 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2104                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2105                 return 0;
2106         }
2107
2108         if (conn->cid == cmd->logout_cid) {
2109                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2110                         " with CID: %hu on CID: %hu, implementation error.\n",
2111                                 cmd->logout_cid, conn->cid);
2112                 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2113                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2114                 return 0;
2115         }
2116
2117         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2118
2119         return 0;
2120 }
2121
2122 static int iscsit_handle_logout_cmd(
2123         struct iscsi_conn *conn,
2124         unsigned char *buf)
2125 {
2126         int cmdsn_ret, logout_remove = 0;
2127         u8 reason_code = 0;
2128         struct iscsi_cmd *cmd;
2129         struct iscsi_logout *hdr;
2130         struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2131
2132         hdr                     = (struct iscsi_logout *) buf;
2133         reason_code             = (hdr->flags & 0x7f);
2134         hdr->itt                = be32_to_cpu(hdr->itt);
2135         hdr->cid                = be16_to_cpu(hdr->cid);
2136         hdr->cmdsn              = be32_to_cpu(hdr->cmdsn);
2137         hdr->exp_statsn = be32_to_cpu(hdr->exp_statsn);
2138
2139         if (tiqn) {
2140                 spin_lock(&tiqn->logout_stats.lock);
2141                 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2142                         tiqn->logout_stats.normal_logouts++;
2143                 else
2144                         tiqn->logout_stats.abnormal_logouts++;
2145                 spin_unlock(&tiqn->logout_stats.lock);
2146         }
2147
2148         pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2149                 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2150                 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2151                 hdr->cid, conn->cid);
2152
2153         if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2154                 pr_err("Received logout request on connection that"
2155                         " is not in logged in state, ignoring request.\n");
2156                 return 0;
2157         }
2158
2159         cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
2160         if (!cmd)
2161                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1,
2162                                         buf, conn);
2163
2164         cmd->iscsi_opcode       = ISCSI_OP_LOGOUT;
2165         cmd->i_state            = ISTATE_SEND_LOGOUTRSP;
2166         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2167         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2168         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2169         cmd->cmd_sn             = hdr->cmdsn;
2170         cmd->exp_stat_sn        = hdr->exp_statsn;
2171         cmd->logout_cid         = hdr->cid;
2172         cmd->logout_reason      = reason_code;
2173         cmd->data_direction     = DMA_NONE;
2174
2175         /*
2176          * We need to sleep in these cases (by returning 1) until the Logout
2177          * Response gets sent in the tx thread.
2178          */
2179         if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2180            ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2181             (hdr->cid == conn->cid)))
2182                 logout_remove = 1;
2183
2184         spin_lock_bh(&conn->cmd_lock);
2185         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2186         spin_unlock_bh(&conn->cmd_lock);
2187
2188         if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2189                 iscsit_ack_from_expstatsn(conn, hdr->exp_statsn);
2190
2191         /*
2192          * Immediate commands are executed, well, immediately.
2193          * Non-Immediate Logout Commands are executed in CmdSN order.
2194          */
2195         if (cmd->immediate_cmd) {
2196                 int ret = iscsit_execute_cmd(cmd, 0);
2197
2198                 if (ret < 0)
2199                         return ret;
2200         } else {
2201                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
2202                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2203                         logout_remove = 0;
2204                 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2205                         return iscsit_add_reject_from_cmd(
2206                                 ISCSI_REASON_PROTOCOL_ERROR,
2207                                 1, 0, buf, cmd);
2208                 }
2209         }
2210
2211         return logout_remove;
2212 }
2213
2214 static int iscsit_handle_snack(
2215         struct iscsi_conn *conn,
2216         unsigned char *buf)
2217 {
2218         struct iscsi_snack *hdr;
2219
2220         hdr                     = (struct iscsi_snack *) buf;
2221         hdr->flags              &= ~ISCSI_FLAG_CMD_FINAL;
2222         hdr->itt                = be32_to_cpu(hdr->itt);
2223         hdr->ttt                = be32_to_cpu(hdr->ttt);
2224         hdr->exp_statsn         = be32_to_cpu(hdr->exp_statsn);
2225         hdr->begrun             = be32_to_cpu(hdr->begrun);
2226         hdr->runlength          = be32_to_cpu(hdr->runlength);
2227
2228         pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2229                 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2230                 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2231                         hdr->begrun, hdr->runlength, conn->cid);
2232
2233         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2234                 pr_err("Initiator sent SNACK request while in"
2235                         " ErrorRecoveryLevel=0.\n");
2236                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2237                                         buf, conn);
2238         }
2239         /*
2240          * SNACK_DATA and SNACK_R2T are both 0,  so check which function to
2241          * call from inside iscsi_send_recovery_datain_or_r2t().
2242          */
2243         switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2244         case 0:
2245                 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2246                         hdr->itt, hdr->ttt, hdr->begrun, hdr->runlength);
2247         case ISCSI_FLAG_SNACK_TYPE_STATUS:
2248                 return iscsit_handle_status_snack(conn, hdr->itt, hdr->ttt,
2249                         hdr->begrun, hdr->runlength);
2250         case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2251                 return iscsit_handle_data_ack(conn, hdr->ttt, hdr->begrun,
2252                         hdr->runlength);
2253         case ISCSI_FLAG_SNACK_TYPE_RDATA:
2254                 /* FIXME: Support R-Data SNACK */
2255                 pr_err("R-Data SNACK Not Supported.\n");
2256                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2257                                         buf, conn);
2258         default:
2259                 pr_err("Unknown SNACK type 0x%02x, protocol"
2260                         " error.\n", hdr->flags & 0x0f);
2261                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2262                                         buf, conn);
2263         }
2264
2265         return 0;
2266 }
2267
2268 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2269 {
2270         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2271             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2272                 wait_for_completion_interruptible_timeout(
2273                                         &conn->rx_half_close_comp,
2274                                         ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2275         }
2276 }
2277
2278 static int iscsit_handle_immediate_data(
2279         struct iscsi_cmd *cmd,
2280         unsigned char *buf,
2281         u32 length)
2282 {
2283         int iov_ret, rx_got = 0, rx_size = 0;
2284         u32 checksum, iov_count = 0, padding = 0;
2285         struct iscsi_conn *conn = cmd->conn;
2286         struct kvec *iov;
2287
2288         iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2289         if (iov_ret < 0)
2290                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2291
2292         rx_size = length;
2293         iov_count = iov_ret;
2294         iov = &cmd->iov_data[0];
2295
2296         padding = ((-length) & 3);
2297         if (padding != 0) {
2298                 iov[iov_count].iov_base = cmd->pad_bytes;
2299                 iov[iov_count++].iov_len = padding;
2300                 rx_size += padding;
2301         }
2302
2303         if (conn->conn_ops->DataDigest) {
2304                 iov[iov_count].iov_base         = &checksum;
2305                 iov[iov_count++].iov_len        = ISCSI_CRC_LEN;
2306                 rx_size += ISCSI_CRC_LEN;
2307         }
2308
2309         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2310
2311         iscsit_unmap_iovec(cmd);
2312
2313         if (rx_got != rx_size) {
2314                 iscsit_rx_thread_wait_for_tcp(conn);
2315                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2316         }
2317
2318         if (conn->conn_ops->DataDigest) {
2319                 u32 data_crc;
2320
2321                 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2322                                                     cmd->write_data_done, length, padding,
2323                                                     cmd->pad_bytes);
2324
2325                 if (checksum != data_crc) {
2326                         pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2327                                 " does not match computed 0x%08x\n", checksum,
2328                                 data_crc);
2329
2330                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2331                                 pr_err("Unable to recover from"
2332                                         " Immediate Data digest failure while"
2333                                         " in ERL=0.\n");
2334                                 iscsit_add_reject_from_cmd(
2335                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2336                                                 1, 0, buf, cmd);
2337                                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2338                         } else {
2339                                 iscsit_add_reject_from_cmd(
2340                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2341                                                 0, 0, buf, cmd);
2342                                 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2343                         }
2344                 } else {
2345                         pr_debug("Got CRC32C DataDigest 0x%08x for"
2346                                 " %u bytes of Immediate Data\n", checksum,
2347                                 length);
2348                 }
2349         }
2350
2351         cmd->write_data_done += length;
2352
2353         if (cmd->write_data_done == cmd->se_cmd.data_length) {
2354                 spin_lock_bh(&cmd->istate_lock);
2355                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2356                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2357                 spin_unlock_bh(&cmd->istate_lock);
2358         }
2359
2360         return IMMEDIATE_DATA_NORMAL_OPERATION;
2361 }
2362
2363 /*
2364  *      Called with sess->conn_lock held.
2365  */
2366 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2367         with active network interface */
2368 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2369 {
2370         struct iscsi_cmd *cmd;
2371         struct iscsi_conn *conn_p;
2372
2373         /*
2374          * Only send a Asynchronous Message on connections whos network
2375          * interface is still functional.
2376          */
2377         list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2378                 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2379                         iscsit_inc_conn_usage_count(conn_p);
2380                         break;
2381                 }
2382         }
2383
2384         if (!conn_p)
2385                 return;
2386
2387         cmd = iscsit_allocate_cmd(conn_p, GFP_KERNEL);
2388         if (!cmd) {
2389                 iscsit_dec_conn_usage_count(conn_p);
2390                 return;
2391         }
2392
2393         cmd->logout_cid = conn->cid;
2394         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2395         cmd->i_state = ISTATE_SEND_ASYNCMSG;
2396
2397         spin_lock_bh(&conn_p->cmd_lock);
2398         list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2399         spin_unlock_bh(&conn_p->cmd_lock);
2400
2401         iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2402         iscsit_dec_conn_usage_count(conn_p);
2403 }
2404
2405 static int iscsit_send_conn_drop_async_message(
2406         struct iscsi_cmd *cmd,
2407         struct iscsi_conn *conn)
2408 {
2409         struct iscsi_async *hdr;
2410
2411         cmd->tx_size = ISCSI_HDR_LEN;
2412         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2413
2414         hdr                     = (struct iscsi_async *) cmd->pdu;
2415         hdr->opcode             = ISCSI_OP_ASYNC_EVENT;
2416         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
2417         cmd->init_task_tag      = 0xFFFFFFFF;
2418         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2419         put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2420         cmd->stat_sn            = conn->stat_sn++;
2421         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2422         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2423         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2424         hdr->async_event        = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2425         hdr->param1             = cpu_to_be16(cmd->logout_cid);
2426         hdr->param2             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2427         hdr->param3             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2428
2429         if (conn->conn_ops->HeaderDigest) {
2430                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2431
2432                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2433                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2434                                 0, NULL, (u8 *)header_digest);
2435
2436                 cmd->tx_size += ISCSI_CRC_LEN;
2437                 pr_debug("Attaching CRC32C HeaderDigest to"
2438                         " Async Message 0x%08x\n", *header_digest);
2439         }
2440
2441         cmd->iov_misc[0].iov_base       = cmd->pdu;
2442         cmd->iov_misc[0].iov_len        = cmd->tx_size;
2443         cmd->iov_misc_count             = 1;
2444
2445         pr_debug("Sending Connection Dropped Async Message StatSN:"
2446                 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2447                         cmd->logout_cid, conn->cid);
2448         return 0;
2449 }
2450
2451 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2452 {
2453         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2454             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2455                 wait_for_completion_interruptible_timeout(
2456                                         &conn->tx_half_close_comp,
2457                                         ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2458         }
2459 }
2460
2461 static int iscsit_send_data_in(
2462         struct iscsi_cmd *cmd,
2463         struct iscsi_conn *conn)
2464 {
2465         int iov_ret = 0, set_statsn = 0;
2466         u32 iov_count = 0, tx_size = 0;
2467         struct iscsi_datain datain;
2468         struct iscsi_datain_req *dr;
2469         struct iscsi_data_rsp *hdr;
2470         struct kvec *iov;
2471         int eodr = 0;
2472         int ret;
2473
2474         memset(&datain, 0, sizeof(struct iscsi_datain));
2475         dr = iscsit_get_datain_values(cmd, &datain);
2476         if (!dr) {
2477                 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2478                                 cmd->init_task_tag);
2479                 return -1;
2480         }
2481
2482         /*
2483          * Be paranoid and double check the logic for now.
2484          */
2485         if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2486                 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2487                         " datain.length: %u exceeds cmd->data_length: %u\n",
2488                         cmd->init_task_tag, datain.offset, datain.length,
2489                                 cmd->se_cmd.data_length);
2490                 return -1;
2491         }
2492
2493         spin_lock_bh(&conn->sess->session_stats_lock);
2494         conn->sess->tx_data_octets += datain.length;
2495         if (conn->sess->se_sess->se_node_acl) {
2496                 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
2497                 conn->sess->se_sess->se_node_acl->read_bytes += datain.length;
2498                 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
2499         }
2500         spin_unlock_bh(&conn->sess->session_stats_lock);
2501         /*
2502          * Special case for successfully execution w/ both DATAIN
2503          * and Sense Data.
2504          */
2505         if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2506             (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2507                 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2508         else {
2509                 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2510                     (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2511                         iscsit_increment_maxcmdsn(cmd, conn->sess);
2512                         cmd->stat_sn = conn->stat_sn++;
2513                         set_statsn = 1;
2514                 } else if (dr->dr_complete ==
2515                                 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2516                         set_statsn = 1;
2517         }
2518
2519         hdr     = (struct iscsi_data_rsp *) cmd->pdu;
2520         memset(hdr, 0, ISCSI_HDR_LEN);
2521         hdr->opcode             = ISCSI_OP_SCSI_DATA_IN;
2522         hdr->flags              = datain.flags;
2523         if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2524                 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2525                         hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2526                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2527                 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2528                         hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2529                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2530                 }
2531         }
2532         hton24(hdr->dlength, datain.length);
2533         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2534                 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2535                                 (struct scsi_lun *)&hdr->lun);
2536         else
2537                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2538
2539         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
2540         hdr->ttt                = (hdr->flags & ISCSI_FLAG_DATA_ACK) ?
2541                                    cpu_to_be32(cmd->targ_xfer_tag) :
2542                                    0xFFFFFFFF;
2543         hdr->statsn             = (set_statsn) ? cpu_to_be32(cmd->stat_sn) :
2544                                                 0xFFFFFFFF;
2545         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2546         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2547         hdr->datasn             = cpu_to_be32(datain.data_sn);
2548         hdr->offset             = cpu_to_be32(datain.offset);
2549
2550         iov = &cmd->iov_data[0];
2551         iov[iov_count].iov_base = cmd->pdu;
2552         iov[iov_count++].iov_len        = ISCSI_HDR_LEN;
2553         tx_size += ISCSI_HDR_LEN;
2554
2555         if (conn->conn_ops->HeaderDigest) {
2556                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2557
2558                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2559                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2560                                 0, NULL, (u8 *)header_digest);
2561
2562                 iov[0].iov_len += ISCSI_CRC_LEN;
2563                 tx_size += ISCSI_CRC_LEN;
2564
2565                 pr_debug("Attaching CRC32 HeaderDigest"
2566                         " for DataIN PDU 0x%08x\n", *header_digest);
2567         }
2568
2569         iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1], datain.offset, datain.length);
2570         if (iov_ret < 0)
2571                 return -1;
2572
2573         iov_count += iov_ret;
2574         tx_size += datain.length;
2575
2576         cmd->padding = ((-datain.length) & 3);
2577         if (cmd->padding) {
2578                 iov[iov_count].iov_base         = cmd->pad_bytes;
2579                 iov[iov_count++].iov_len        = cmd->padding;
2580                 tx_size += cmd->padding;
2581
2582                 pr_debug("Attaching %u padding bytes\n",
2583                                 cmd->padding);
2584         }
2585         if (conn->conn_ops->DataDigest) {
2586                 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2587                          datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2588
2589                 iov[iov_count].iov_base = &cmd->data_crc;
2590                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2591                 tx_size += ISCSI_CRC_LEN;
2592
2593                 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2594                         " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2595         }
2596
2597         cmd->iov_data_count = iov_count;
2598         cmd->tx_size = tx_size;
2599
2600         pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2601                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2602                 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2603                 ntohl(hdr->offset), datain.length, conn->cid);
2604
2605         /* sendpage is preferred but can't insert markers */
2606         if (!conn->conn_ops->IFMarker)
2607                 ret = iscsit_fe_sendpage_sg(cmd, conn);
2608         else
2609                 ret = iscsit_send_tx_data(cmd, conn, 0);
2610
2611         iscsit_unmap_iovec(cmd);
2612
2613         if (ret < 0) {
2614                 iscsit_tx_thread_wait_for_tcp(conn);
2615                 return ret;
2616         }
2617
2618         if (dr->dr_complete) {
2619                 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2620                                 2 : 1;
2621                 iscsit_free_datain_req(cmd, dr);
2622         }
2623
2624         return eodr;
2625 }
2626
2627 static int iscsit_send_logout_response(
2628         struct iscsi_cmd *cmd,
2629         struct iscsi_conn *conn)
2630 {
2631         int niov = 0, tx_size;
2632         struct iscsi_conn *logout_conn = NULL;
2633         struct iscsi_conn_recovery *cr = NULL;
2634         struct iscsi_session *sess = conn->sess;
2635         struct kvec *iov;
2636         struct iscsi_logout_rsp *hdr;
2637         /*
2638          * The actual shutting down of Sessions and/or Connections
2639          * for CLOSESESSION and CLOSECONNECTION Logout Requests
2640          * is done in scsi_logout_post_handler().
2641          */
2642         switch (cmd->logout_reason) {
2643         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2644                 pr_debug("iSCSI session logout successful, setting"
2645                         " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2646                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2647                 break;
2648         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2649                 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2650                         break;
2651                 /*
2652                  * For CLOSECONNECTION logout requests carrying
2653                  * a matching logout CID -> local CID, the reference
2654                  * for the local CID will have been incremented in
2655                  * iscsi_logout_closeconnection().
2656                  *
2657                  * For CLOSECONNECTION logout requests carrying
2658                  * a different CID than the connection it arrived
2659                  * on, the connection responding to cmd->logout_cid
2660                  * is stopped in iscsit_logout_post_handler_diffcid().
2661                  */
2662
2663                 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2664                         " successful.\n", cmd->logout_cid, conn->cid);
2665                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2666                 break;
2667         case ISCSI_LOGOUT_REASON_RECOVERY:
2668                 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2669                     (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2670                         break;
2671                 /*
2672                  * If the connection is still active from our point of view
2673                  * force connection recovery to occur.
2674                  */
2675                 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2676                                 cmd->logout_cid);
2677                 if (logout_conn) {
2678                         iscsit_connection_reinstatement_rcfr(logout_conn);
2679                         iscsit_dec_conn_usage_count(logout_conn);
2680                 }
2681
2682                 cr = iscsit_get_inactive_connection_recovery_entry(
2683                                 conn->sess, cmd->logout_cid);
2684                 if (!cr) {
2685                         pr_err("Unable to locate CID: %hu for"
2686                         " REMOVECONNFORRECOVERY Logout Request.\n",
2687                                 cmd->logout_cid);
2688                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2689                         break;
2690                 }
2691
2692                 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2693
2694                 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2695                         " for recovery for CID: %hu on CID: %hu successful.\n",
2696                                 cmd->logout_cid, conn->cid);
2697                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2698                 break;
2699         default:
2700                 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2701                                 cmd->logout_reason);
2702                 return -1;
2703         }
2704
2705         tx_size = ISCSI_HDR_LEN;
2706         hdr                     = (struct iscsi_logout_rsp *)cmd->pdu;
2707         memset(hdr, 0, ISCSI_HDR_LEN);
2708         hdr->opcode             = ISCSI_OP_LOGOUT_RSP;
2709         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2710         hdr->response           = cmd->logout_response;
2711         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
2712         cmd->stat_sn            = conn->stat_sn++;
2713         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2714
2715         iscsit_increment_maxcmdsn(cmd, conn->sess);
2716         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2717         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2718
2719         iov = &cmd->iov_misc[0];
2720         iov[niov].iov_base      = cmd->pdu;
2721         iov[niov++].iov_len     = ISCSI_HDR_LEN;
2722
2723         if (conn->conn_ops->HeaderDigest) {
2724                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2725
2726                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2727                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2728                                 0, NULL, (u8 *)header_digest);
2729
2730                 iov[0].iov_len += ISCSI_CRC_LEN;
2731                 tx_size += ISCSI_CRC_LEN;
2732                 pr_debug("Attaching CRC32C HeaderDigest to"
2733                         " Logout Response 0x%08x\n", *header_digest);
2734         }
2735         cmd->iov_misc_count = niov;
2736         cmd->tx_size = tx_size;
2737
2738         pr_debug("Sending Logout Response ITT: 0x%08x StatSN:"
2739                 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2740                 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2741                 cmd->logout_cid, conn->cid);
2742
2743         return 0;
2744 }
2745
2746 /*
2747  *      Unsolicited NOPIN, either requesting a response or not.
2748  */
2749 static int iscsit_send_unsolicited_nopin(
2750         struct iscsi_cmd *cmd,
2751         struct iscsi_conn *conn,
2752         int want_response)
2753 {
2754         int tx_size = ISCSI_HDR_LEN;
2755         struct iscsi_nopin *hdr;
2756         int ret;
2757
2758         hdr                     = (struct iscsi_nopin *) cmd->pdu;
2759         memset(hdr, 0, ISCSI_HDR_LEN);
2760         hdr->opcode             = ISCSI_OP_NOOP_IN;
2761         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2762         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
2763         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2764         cmd->stat_sn            = conn->stat_sn;
2765         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2766         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2767         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2768
2769         if (conn->conn_ops->HeaderDigest) {
2770                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2771
2772                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2773                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2774                                 0, NULL, (u8 *)header_digest);
2775
2776                 tx_size += ISCSI_CRC_LEN;
2777                 pr_debug("Attaching CRC32C HeaderDigest to"
2778                         " NopIN 0x%08x\n", *header_digest);
2779         }
2780
2781         cmd->iov_misc[0].iov_base       = cmd->pdu;
2782         cmd->iov_misc[0].iov_len        = tx_size;
2783         cmd->iov_misc_count     = 1;
2784         cmd->tx_size            = tx_size;
2785
2786         pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2787                 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2788
2789         ret = iscsit_send_tx_data(cmd, conn, 1);
2790         if (ret < 0) {
2791                 iscsit_tx_thread_wait_for_tcp(conn);
2792                 return ret;
2793         }
2794
2795         spin_lock_bh(&cmd->istate_lock);
2796         cmd->i_state = want_response ?
2797                 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
2798         spin_unlock_bh(&cmd->istate_lock);
2799
2800         return 0;
2801 }
2802
2803 static int iscsit_send_nopin_response(
2804         struct iscsi_cmd *cmd,
2805         struct iscsi_conn *conn)
2806 {
2807         int niov = 0, tx_size;
2808         u32 padding = 0;
2809         struct kvec *iov;
2810         struct iscsi_nopin *hdr;
2811
2812         tx_size = ISCSI_HDR_LEN;
2813         hdr                     = (struct iscsi_nopin *) cmd->pdu;
2814         memset(hdr, 0, ISCSI_HDR_LEN);
2815         hdr->opcode             = ISCSI_OP_NOOP_IN;
2816         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2817         hton24(hdr->dlength, cmd->buf_ptr_size);
2818         put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2819         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
2820         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2821         cmd->stat_sn            = conn->stat_sn++;
2822         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2823
2824         iscsit_increment_maxcmdsn(cmd, conn->sess);
2825         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2826         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2827
2828         iov = &cmd->iov_misc[0];
2829         iov[niov].iov_base      = cmd->pdu;
2830         iov[niov++].iov_len     = ISCSI_HDR_LEN;
2831
2832         if (conn->conn_ops->HeaderDigest) {
2833                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2834
2835                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2836                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2837                                 0, NULL, (u8 *)header_digest);
2838
2839                 iov[0].iov_len += ISCSI_CRC_LEN;
2840                 tx_size += ISCSI_CRC_LEN;
2841                 pr_debug("Attaching CRC32C HeaderDigest"
2842                         " to NopIn 0x%08x\n", *header_digest);
2843         }
2844
2845         /*
2846          * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2847          * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2848          */
2849         if (cmd->buf_ptr_size) {
2850                 iov[niov].iov_base      = cmd->buf_ptr;
2851                 iov[niov++].iov_len     = cmd->buf_ptr_size;
2852                 tx_size += cmd->buf_ptr_size;
2853
2854                 pr_debug("Echoing back %u bytes of ping"
2855                         " data.\n", cmd->buf_ptr_size);
2856
2857                 padding = ((-cmd->buf_ptr_size) & 3);
2858                 if (padding != 0) {
2859                         iov[niov].iov_base = &cmd->pad_bytes;
2860                         iov[niov++].iov_len = padding;
2861                         tx_size += padding;
2862                         pr_debug("Attaching %u additional"
2863                                 " padding bytes.\n", padding);
2864                 }
2865                 if (conn->conn_ops->DataDigest) {
2866                         iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2867                                 cmd->buf_ptr, cmd->buf_ptr_size,
2868                                 padding, (u8 *)&cmd->pad_bytes,
2869                                 (u8 *)&cmd->data_crc);
2870
2871                         iov[niov].iov_base = &cmd->data_crc;
2872                         iov[niov++].iov_len = ISCSI_CRC_LEN;
2873                         tx_size += ISCSI_CRC_LEN;
2874                         pr_debug("Attached DataDigest for %u"
2875                                 " bytes of ping data, CRC 0x%08x\n",
2876                                 cmd->buf_ptr_size, cmd->data_crc);
2877                 }
2878         }
2879
2880         cmd->iov_misc_count = niov;
2881         cmd->tx_size = tx_size;
2882
2883         pr_debug("Sending NOPIN Response ITT: 0x%08x, TTT:"
2884                 " 0x%08x, StatSN: 0x%08x, Length %u\n", cmd->init_task_tag,
2885                 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2886
2887         return 0;
2888 }
2889
2890 static int iscsit_send_r2t(
2891         struct iscsi_cmd *cmd,
2892         struct iscsi_conn *conn)
2893 {
2894         int tx_size = 0;
2895         struct iscsi_r2t *r2t;
2896         struct iscsi_r2t_rsp *hdr;
2897         int ret;
2898
2899         r2t = iscsit_get_r2t_from_list(cmd);
2900         if (!r2t)
2901                 return -1;
2902
2903         hdr                     = (struct iscsi_r2t_rsp *) cmd->pdu;
2904         memset(hdr, 0, ISCSI_HDR_LEN);
2905         hdr->opcode             = ISCSI_OP_R2T;
2906         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2907         int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2908                         (struct scsi_lun *)&hdr->lun);
2909         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
2910         spin_lock_bh(&conn->sess->ttt_lock);
2911         r2t->targ_xfer_tag      = conn->sess->targ_xfer_tag++;
2912         if (r2t->targ_xfer_tag == 0xFFFFFFFF)
2913                 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
2914         spin_unlock_bh(&conn->sess->ttt_lock);
2915         hdr->ttt                = cpu_to_be32(r2t->targ_xfer_tag);
2916         hdr->statsn             = cpu_to_be32(conn->stat_sn);
2917         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2918         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2919         hdr->r2tsn              = cpu_to_be32(r2t->r2t_sn);
2920         hdr->data_offset        = cpu_to_be32(r2t->offset);
2921         hdr->data_length        = cpu_to_be32(r2t->xfer_len);
2922
2923         cmd->iov_misc[0].iov_base       = cmd->pdu;
2924         cmd->iov_misc[0].iov_len        = ISCSI_HDR_LEN;
2925         tx_size += ISCSI_HDR_LEN;
2926
2927         if (conn->conn_ops->HeaderDigest) {
2928                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2929
2930                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2931                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2932                                 0, NULL, (u8 *)header_digest);
2933
2934                 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
2935                 tx_size += ISCSI_CRC_LEN;
2936                 pr_debug("Attaching CRC32 HeaderDigest for R2T"
2937                         " PDU 0x%08x\n", *header_digest);
2938         }
2939
2940         pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
2941                 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
2942                 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
2943                 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
2944                         r2t->offset, r2t->xfer_len, conn->cid);
2945
2946         cmd->iov_misc_count = 1;
2947         cmd->tx_size = tx_size;
2948
2949         spin_lock_bh(&cmd->r2t_lock);
2950         r2t->sent_r2t = 1;
2951         spin_unlock_bh(&cmd->r2t_lock);
2952
2953         ret = iscsit_send_tx_data(cmd, conn, 1);
2954         if (ret < 0) {
2955                 iscsit_tx_thread_wait_for_tcp(conn);
2956                 return ret;
2957         }
2958
2959         spin_lock_bh(&cmd->dataout_timeout_lock);
2960         iscsit_start_dataout_timer(cmd, conn);
2961         spin_unlock_bh(&cmd->dataout_timeout_lock);
2962
2963         return 0;
2964 }
2965
2966 /*
2967  *      @recovery: If called from iscsi_task_reassign_complete_write() for
2968  *              connection recovery.
2969  */
2970 int iscsit_build_r2ts_for_cmd(
2971         struct iscsi_cmd *cmd,
2972         struct iscsi_conn *conn,
2973         bool recovery)
2974 {
2975         int first_r2t = 1;
2976         u32 offset = 0, xfer_len = 0;
2977
2978         spin_lock_bh(&cmd->r2t_lock);
2979         if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
2980                 spin_unlock_bh(&cmd->r2t_lock);
2981                 return 0;
2982         }
2983
2984         if (conn->sess->sess_ops->DataSequenceInOrder &&
2985             !recovery)
2986                 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
2987
2988         while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
2989                 if (conn->sess->sess_ops->DataSequenceInOrder) {
2990                         offset = cmd->r2t_offset;
2991
2992                         if (first_r2t && recovery) {
2993                                 int new_data_end = offset +
2994                                         conn->sess->sess_ops->MaxBurstLength -
2995                                         cmd->next_burst_len;
2996
2997                                 if (new_data_end > cmd->se_cmd.data_length)
2998                                         xfer_len = cmd->se_cmd.data_length - offset;
2999                                 else
3000                                         xfer_len =
3001                                                 conn->sess->sess_ops->MaxBurstLength -
3002                                                 cmd->next_burst_len;
3003                         } else {
3004                                 int new_data_end = offset +
3005                                         conn->sess->sess_ops->MaxBurstLength;
3006
3007                                 if (new_data_end > cmd->se_cmd.data_length)
3008                                         xfer_len = cmd->se_cmd.data_length - offset;
3009                                 else
3010                                         xfer_len = conn->sess->sess_ops->MaxBurstLength;
3011                         }
3012                         cmd->r2t_offset += xfer_len;
3013
3014                         if (cmd->r2t_offset == cmd->se_cmd.data_length)
3015                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3016                 } else {
3017                         struct iscsi_seq *seq;
3018
3019                         seq = iscsit_get_seq_holder_for_r2t(cmd);
3020                         if (!seq) {
3021                                 spin_unlock_bh(&cmd->r2t_lock);
3022                                 return -1;
3023                         }
3024
3025                         offset = seq->offset;
3026                         xfer_len = seq->xfer_len;
3027
3028                         if (cmd->seq_send_order == cmd->seq_count)
3029                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3030                 }
3031                 cmd->outstanding_r2ts++;
3032                 first_r2t = 0;
3033
3034                 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3035                         spin_unlock_bh(&cmd->r2t_lock);
3036                         return -1;
3037                 }
3038
3039                 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3040                         break;
3041         }
3042         spin_unlock_bh(&cmd->r2t_lock);
3043
3044         return 0;
3045 }
3046
3047 static int iscsit_send_status(
3048         struct iscsi_cmd *cmd,
3049         struct iscsi_conn *conn)
3050 {
3051         u8 iov_count = 0, recovery;
3052         u32 padding = 0, tx_size = 0;
3053         struct iscsi_scsi_rsp *hdr;
3054         struct kvec *iov;
3055
3056         recovery = (cmd->i_state != ISTATE_SEND_STATUS);
3057         if (!recovery)
3058                 cmd->stat_sn = conn->stat_sn++;
3059
3060         spin_lock_bh(&conn->sess->session_stats_lock);
3061         conn->sess->rsp_pdus++;
3062         spin_unlock_bh(&conn->sess->session_stats_lock);
3063
3064         hdr                     = (struct iscsi_scsi_rsp *) cmd->pdu;
3065         memset(hdr, 0, ISCSI_HDR_LEN);
3066         hdr->opcode             = ISCSI_OP_SCSI_CMD_RSP;
3067         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3068         if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3069                 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3070                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3071         } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3072                 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3073                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3074         }
3075         hdr->response           = cmd->iscsi_response;
3076         hdr->cmd_status         = cmd->se_cmd.scsi_status;
3077         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
3078         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3079
3080         iscsit_increment_maxcmdsn(cmd, conn->sess);
3081         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3082         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3083
3084         iov = &cmd->iov_misc[0];
3085         iov[iov_count].iov_base = cmd->pdu;
3086         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3087         tx_size += ISCSI_HDR_LEN;
3088
3089         /*
3090          * Attach SENSE DATA payload to iSCSI Response PDU
3091          */
3092         if (cmd->se_cmd.sense_buffer &&
3093            ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3094             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3095                 padding         = -(cmd->se_cmd.scsi_sense_length) & 3;
3096                 hton24(hdr->dlength, cmd->se_cmd.scsi_sense_length);
3097                 iov[iov_count].iov_base = cmd->se_cmd.sense_buffer;
3098                 iov[iov_count++].iov_len =
3099                                 (cmd->se_cmd.scsi_sense_length + padding);
3100                 tx_size += cmd->se_cmd.scsi_sense_length;
3101
3102                 if (padding) {
3103                         memset(cmd->se_cmd.sense_buffer +
3104                                 cmd->se_cmd.scsi_sense_length, 0, padding);
3105                         tx_size += padding;
3106                         pr_debug("Adding %u bytes of padding to"
3107                                 " SENSE.\n", padding);
3108                 }
3109
3110                 if (conn->conn_ops->DataDigest) {
3111                         iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3112                                 cmd->se_cmd.sense_buffer,
3113                                 (cmd->se_cmd.scsi_sense_length + padding),
3114                                 0, NULL, (u8 *)&cmd->data_crc);
3115
3116                         iov[iov_count].iov_base    = &cmd->data_crc;
3117                         iov[iov_count++].iov_len     = ISCSI_CRC_LEN;
3118                         tx_size += ISCSI_CRC_LEN;
3119
3120                         pr_debug("Attaching CRC32 DataDigest for"
3121                                 " SENSE, %u bytes CRC 0x%08x\n",
3122                                 (cmd->se_cmd.scsi_sense_length + padding),
3123                                 cmd->data_crc);
3124                 }
3125
3126                 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3127                                 " Response PDU\n",
3128                                 cmd->se_cmd.scsi_sense_length);
3129         }
3130
3131         if (conn->conn_ops->HeaderDigest) {
3132                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3133
3134                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3135                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
3136                                 0, NULL, (u8 *)header_digest);
3137
3138                 iov[0].iov_len += ISCSI_CRC_LEN;
3139                 tx_size += ISCSI_CRC_LEN;
3140                 pr_debug("Attaching CRC32 HeaderDigest for Response"
3141                                 " PDU 0x%08x\n", *header_digest);
3142         }
3143
3144         cmd->iov_misc_count = iov_count;
3145         cmd->tx_size = tx_size;
3146
3147         pr_debug("Built %sSCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3148                 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3149                 (!recovery) ? "" : "Recovery ", cmd->init_task_tag,
3150                 cmd->stat_sn, 0x00, cmd->se_cmd.scsi_status, conn->cid);
3151
3152         return 0;
3153 }
3154
3155 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3156 {
3157         switch (se_tmr->response) {
3158         case TMR_FUNCTION_COMPLETE:
3159                 return ISCSI_TMF_RSP_COMPLETE;
3160         case TMR_TASK_DOES_NOT_EXIST:
3161                 return ISCSI_TMF_RSP_NO_TASK;
3162         case TMR_LUN_DOES_NOT_EXIST:
3163                 return ISCSI_TMF_RSP_NO_LUN;
3164         case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3165                 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3166         case TMR_FUNCTION_AUTHORIZATION_FAILED:
3167                 return ISCSI_TMF_RSP_AUTH_FAILED;
3168         case TMR_FUNCTION_REJECTED:
3169         default:
3170                 return ISCSI_TMF_RSP_REJECTED;
3171         }
3172 }
3173
3174 static int iscsit_send_task_mgt_rsp(
3175         struct iscsi_cmd *cmd,
3176         struct iscsi_conn *conn)
3177 {
3178         struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3179         struct iscsi_tm_rsp *hdr;
3180         u32 tx_size = 0;
3181
3182         hdr                     = (struct iscsi_tm_rsp *) cmd->pdu;
3183         memset(hdr, 0, ISCSI_HDR_LEN);
3184         hdr->opcode             = ISCSI_OP_SCSI_TMFUNC_RSP;
3185         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
3186         hdr->response           = iscsit_convert_tcm_tmr_rsp(se_tmr);
3187         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
3188         cmd->stat_sn            = conn->stat_sn++;
3189         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3190
3191         iscsit_increment_maxcmdsn(cmd, conn->sess);
3192         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3193         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3194
3195         cmd->iov_misc[0].iov_base       = cmd->pdu;
3196         cmd->iov_misc[0].iov_len        = ISCSI_HDR_LEN;
3197         tx_size += ISCSI_HDR_LEN;
3198
3199         if (conn->conn_ops->HeaderDigest) {
3200                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3201
3202                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3203                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
3204                                 0, NULL, (u8 *)header_digest);
3205
3206                 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3207                 tx_size += ISCSI_CRC_LEN;
3208                 pr_debug("Attaching CRC32 HeaderDigest for Task"
3209                         " Mgmt Response PDU 0x%08x\n", *header_digest);
3210         }
3211
3212         cmd->iov_misc_count = 1;
3213         cmd->tx_size = tx_size;
3214
3215         pr_debug("Built Task Management Response ITT: 0x%08x,"
3216                 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3217                 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3218
3219         return 0;
3220 }
3221
3222 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3223 {
3224         bool ret = false;
3225
3226         if (np->np_sockaddr.ss_family == AF_INET6) {
3227                 const struct sockaddr_in6 sin6 = {
3228                         .sin6_addr = IN6ADDR_ANY_INIT };
3229                 struct sockaddr_in6 *sock_in6 =
3230                          (struct sockaddr_in6 *)&np->np_sockaddr;
3231
3232                 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3233                                 sin6.sin6_addr.s6_addr, 16))
3234                         ret = true;
3235         } else {
3236                 struct sockaddr_in * sock_in =
3237                         (struct sockaddr_in *)&np->np_sockaddr;
3238
3239                 if (sock_in->sin_addr.s_addr == INADDR_ANY)
3240                         ret = true;
3241         }
3242
3243         return ret;
3244 }
3245
3246 #define SENDTARGETS_BUF_LIMIT 32768U
3247
3248 static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd)
3249 {
3250         char *payload = NULL;
3251         struct iscsi_conn *conn = cmd->conn;
3252         struct iscsi_portal_group *tpg;
3253         struct iscsi_tiqn *tiqn;
3254         struct iscsi_tpg_np *tpg_np;
3255         int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3256         unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3257
3258         buffer_len = max(conn->conn_ops->MaxRecvDataSegmentLength,
3259                          SENDTARGETS_BUF_LIMIT);
3260
3261         payload = kzalloc(buffer_len, GFP_KERNEL);
3262         if (!payload) {
3263                 pr_err("Unable to allocate memory for sendtargets"
3264                                 " response.\n");
3265                 return -ENOMEM;
3266         }
3267
3268         spin_lock(&tiqn_lock);
3269         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3270                 len = sprintf(buf, "TargetName=%s", tiqn->tiqn);
3271                 len += 1;
3272
3273                 if ((len + payload_len) > buffer_len) {
3274                         spin_unlock(&tiqn->tiqn_tpg_lock);
3275                         end_of_buf = 1;
3276                         goto eob;
3277                 }
3278                 memcpy(payload + payload_len, buf, len);
3279                 payload_len += len;
3280
3281                 spin_lock(&tiqn->tiqn_tpg_lock);
3282                 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3283
3284                         spin_lock(&tpg->tpg_state_lock);
3285                         if ((tpg->tpg_state == TPG_STATE_FREE) ||
3286                             (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3287                                 spin_unlock(&tpg->tpg_state_lock);
3288                                 continue;
3289                         }
3290                         spin_unlock(&tpg->tpg_state_lock);
3291
3292                         spin_lock(&tpg->tpg_np_lock);
3293                         list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3294                                                 tpg_np_list) {
3295                                 struct iscsi_np *np = tpg_np->tpg_np;
3296                                 bool inaddr_any = iscsit_check_inaddr_any(np);
3297
3298                                 len = sprintf(buf, "TargetAddress="
3299                                         "%s%s%s:%hu,%hu",
3300                                         (np->np_sockaddr.ss_family == AF_INET6) ?
3301                                         "[" : "", (inaddr_any == false) ?
3302                                                 np->np_ip : conn->local_ip,
3303                                         (np->np_sockaddr.ss_family == AF_INET6) ?
3304                                         "]" : "", (inaddr_any == false) ?
3305                                                 np->np_port : conn->local_port,
3306                                         tpg->tpgt);
3307                                 len += 1;
3308
3309                                 if ((len + payload_len) > buffer_len) {
3310                                         spin_unlock(&tpg->tpg_np_lock);
3311                                         spin_unlock(&tiqn->tiqn_tpg_lock);
3312                                         end_of_buf = 1;
3313                                         goto eob;
3314                                 }
3315                                 memcpy(payload + payload_len, buf, len);
3316                                 payload_len += len;
3317                         }
3318                         spin_unlock(&tpg->tpg_np_lock);
3319                 }
3320                 spin_unlock(&tiqn->tiqn_tpg_lock);
3321 eob:
3322                 if (end_of_buf)
3323                         break;
3324         }
3325         spin_unlock(&tiqn_lock);
3326
3327         cmd->buf_ptr = payload;
3328
3329         return payload_len;
3330 }
3331
3332 /*
3333  *      FIXME: Add support for F_BIT and C_BIT when the length is longer than
3334  *      MaxRecvDataSegmentLength.
3335  */
3336 static int iscsit_send_text_rsp(
3337         struct iscsi_cmd *cmd,
3338         struct iscsi_conn *conn)
3339 {
3340         struct iscsi_text_rsp *hdr;
3341         struct kvec *iov;
3342         u32 padding = 0, tx_size = 0;
3343         int text_length, iov_count = 0;
3344
3345         text_length = iscsit_build_sendtargets_response(cmd);
3346         if (text_length < 0)
3347                 return text_length;
3348
3349         padding = ((-text_length) & 3);
3350         if (padding != 0) {
3351                 memset(cmd->buf_ptr + text_length, 0, padding);
3352                 pr_debug("Attaching %u additional bytes for"
3353                         " padding.\n", padding);
3354         }
3355
3356         hdr                     = (struct iscsi_text_rsp *) cmd->pdu;
3357         memset(hdr, 0, ISCSI_HDR_LEN);
3358         hdr->opcode             = ISCSI_OP_TEXT_RSP;
3359         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3360         hton24(hdr->dlength, text_length);
3361         hdr->itt                = cpu_to_be32(cmd->init_task_tag);
3362         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
3363         cmd->stat_sn            = conn->stat_sn++;
3364         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3365
3366         iscsit_increment_maxcmdsn(cmd, conn->sess);
3367         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3368         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3369
3370         iov = &cmd->iov_misc[0];
3371
3372         iov[iov_count].iov_base = cmd->pdu;
3373         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3374         iov[iov_count].iov_base = cmd->buf_ptr;
3375         iov[iov_count++].iov_len = text_length + padding;
3376
3377         tx_size += (ISCSI_HDR_LEN + text_length + padding);
3378
3379         if (conn->conn_ops->HeaderDigest) {
3380                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3381
3382                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3383                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
3384                                 0, NULL, (u8 *)header_digest);
3385
3386                 iov[0].iov_len += ISCSI_CRC_LEN;
3387                 tx_size += ISCSI_CRC_LEN;
3388                 pr_debug("Attaching CRC32 HeaderDigest for"
3389                         " Text Response PDU 0x%08x\n", *header_digest);
3390         }
3391
3392         if (conn->conn_ops->DataDigest) {
3393                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3394                                 cmd->buf_ptr, (text_length + padding),
3395                                 0, NULL, (u8 *)&cmd->data_crc);
3396
3397                 iov[iov_count].iov_base = &cmd->data_crc;
3398                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3399                 tx_size += ISCSI_CRC_LEN;
3400
3401                 pr_debug("Attaching DataDigest for %u bytes of text"
3402                         " data, CRC 0x%08x\n", (text_length + padding),
3403                         cmd->data_crc);
3404         }
3405
3406         cmd->iov_misc_count = iov_count;
3407         cmd->tx_size = tx_size;
3408
3409         pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
3410                 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn,
3411                         text_length, conn->cid);
3412         return 0;
3413 }
3414
3415 static int iscsit_send_reject(
3416         struct iscsi_cmd *cmd,
3417         struct iscsi_conn *conn)
3418 {
3419         u32 iov_count = 0, tx_size = 0;
3420         struct iscsi_reject *hdr;
3421         struct kvec *iov;
3422
3423         hdr                     = (struct iscsi_reject *) cmd->pdu;
3424         hdr->opcode             = ISCSI_OP_REJECT;
3425         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3426         hton24(hdr->dlength, ISCSI_HDR_LEN);
3427         cmd->stat_sn            = conn->stat_sn++;
3428         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3429         hdr->exp_cmdsn  = cpu_to_be32(conn->sess->exp_cmd_sn);
3430         hdr->max_cmdsn  = cpu_to_be32(conn->sess->max_cmd_sn);
3431
3432         iov = &cmd->iov_misc[0];
3433
3434         iov[iov_count].iov_base = cmd->pdu;
3435         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3436         iov[iov_count].iov_base = cmd->buf_ptr;
3437         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3438
3439         tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3440
3441         if (conn->conn_ops->HeaderDigest) {
3442                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3443
3444                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3445                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
3446                                 0, NULL, (u8 *)header_digest);
3447
3448                 iov[0].iov_len += ISCSI_CRC_LEN;
3449                 tx_size += ISCSI_CRC_LEN;
3450                 pr_debug("Attaching CRC32 HeaderDigest for"
3451                         " REJECT PDU 0x%08x\n", *header_digest);
3452         }
3453
3454         if (conn->conn_ops->DataDigest) {
3455                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3456                                 (unsigned char *)cmd->buf_ptr, ISCSI_HDR_LEN,
3457                                 0, NULL, (u8 *)&cmd->data_crc);
3458
3459                 iov[iov_count].iov_base = &cmd->data_crc;
3460                 iov[iov_count++].iov_len  = ISCSI_CRC_LEN;
3461                 tx_size += ISCSI_CRC_LEN;
3462                 pr_debug("Attaching CRC32 DataDigest for REJECT"
3463                                 " PDU 0x%08x\n", cmd->data_crc);
3464         }
3465
3466         cmd->iov_misc_count = iov_count;
3467         cmd->tx_size = tx_size;
3468
3469         pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3470                 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3471
3472         return 0;
3473 }
3474
3475 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3476 {
3477         struct iscsi_thread_set *ts = conn->thread_set;
3478         int ord, cpu;
3479         /*
3480          * thread_id is assigned from iscsit_global->ts_bitmap from
3481          * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
3482          *
3483          * Here we use thread_id to determine which CPU that this
3484          * iSCSI connection's iscsi_thread_set will be scheduled to
3485          * execute upon.
3486          */
3487         ord = ts->thread_id % cpumask_weight(cpu_online_mask);
3488         for_each_online_cpu(cpu) {
3489                 if (ord-- == 0) {
3490                         cpumask_set_cpu(cpu, conn->conn_cpumask);
3491                         return;
3492                 }
3493         }
3494         /*
3495          * This should never be reached..
3496          */
3497         dump_stack();
3498         cpumask_setall(conn->conn_cpumask);
3499 }
3500
3501 static inline void iscsit_thread_check_cpumask(
3502         struct iscsi_conn *conn,
3503         struct task_struct *p,
3504         int mode)
3505 {
3506         char buf[128];
3507         /*
3508          * mode == 1 signals iscsi_target_tx_thread() usage.
3509          * mode == 0 signals iscsi_target_rx_thread() usage.
3510          */
3511         if (mode == 1) {
3512                 if (!conn->conn_tx_reset_cpumask)
3513                         return;
3514                 conn->conn_tx_reset_cpumask = 0;
3515         } else {
3516                 if (!conn->conn_rx_reset_cpumask)
3517                         return;
3518                 conn->conn_rx_reset_cpumask = 0;
3519         }
3520         /*
3521          * Update the CPU mask for this single kthread so that
3522          * both TX and RX kthreads are scheduled to run on the
3523          * same CPU.
3524          */
3525         memset(buf, 0, 128);
3526         cpumask_scnprintf(buf, 128, conn->conn_cpumask);
3527         set_cpus_allowed_ptr(p, conn->conn_cpumask);
3528 }
3529
3530 static int handle_immediate_queue(struct iscsi_conn *conn)
3531 {
3532         struct iscsi_queue_req *qr;
3533         struct iscsi_cmd *cmd;
3534         u8 state;
3535         int ret;
3536
3537         while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3538                 atomic_set(&conn->check_immediate_queue, 0);
3539                 cmd = qr->cmd;
3540                 state = qr->state;
3541                 kmem_cache_free(lio_qr_cache, qr);
3542
3543                 switch (state) {
3544                 case ISTATE_SEND_R2T:
3545                         ret = iscsit_send_r2t(cmd, conn);
3546                         if (ret < 0)
3547                                 goto err;
3548                         break;
3549                 case ISTATE_REMOVE:
3550                         if (cmd->data_direction == DMA_TO_DEVICE)
3551                                 iscsit_stop_dataout_timer(cmd);
3552
3553                         spin_lock_bh(&conn->cmd_lock);
3554                         list_del(&cmd->i_conn_node);
3555                         spin_unlock_bh(&conn->cmd_lock);
3556
3557                         iscsit_free_cmd(cmd);
3558                         continue;
3559                 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3560                         iscsit_mod_nopin_response_timer(conn);
3561                         ret = iscsit_send_unsolicited_nopin(cmd,
3562                                                             conn, 1);
3563                         if (ret < 0)
3564                                 goto err;
3565                         break;
3566                 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3567                         ret = iscsit_send_unsolicited_nopin(cmd,
3568                                                             conn, 0);
3569                         if (ret < 0)
3570                                 goto err;
3571                         break;
3572                 default:
3573                         pr_err("Unknown Opcode: 0x%02x ITT:"
3574                                " 0x%08x, i_state: %d on CID: %hu\n",
3575                                cmd->iscsi_opcode, cmd->init_task_tag, state,
3576                                conn->cid);
3577                         goto err;
3578                 }
3579         }
3580
3581         return 0;
3582
3583 err:
3584         return -1;
3585 }
3586
3587 static int handle_response_queue(struct iscsi_conn *conn)
3588 {
3589         struct iscsi_queue_req *qr;
3590         struct iscsi_cmd *cmd;
3591         u8 state;
3592         int ret;
3593
3594         while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3595                 cmd = qr->cmd;
3596                 state = qr->state;
3597                 kmem_cache_free(lio_qr_cache, qr);
3598
3599 check_rsp_state:
3600                 switch (state) {
3601                 case ISTATE_SEND_DATAIN:
3602                         ret = iscsit_send_data_in(cmd, conn);
3603                         if (ret < 0)
3604                                 goto err;
3605                         else if (!ret)
3606                                 /* more drs */
3607                                 goto check_rsp_state;
3608                         else if (ret == 1) {
3609                                 /* all done */
3610                                 spin_lock_bh(&cmd->istate_lock);
3611                                 cmd->i_state = ISTATE_SENT_STATUS;
3612                                 spin_unlock_bh(&cmd->istate_lock);
3613                                 continue;
3614                         } else if (ret == 2) {
3615                                 /* Still must send status,
3616                                    SCF_TRANSPORT_TASK_SENSE was set */
3617                                 spin_lock_bh(&cmd->istate_lock);
3618                                 cmd->i_state = ISTATE_SEND_STATUS;
3619                                 spin_unlock_bh(&cmd->istate_lock);
3620                                 state = ISTATE_SEND_STATUS;
3621                                 goto check_rsp_state;
3622                         }
3623
3624                         break;
3625                 case ISTATE_SEND_STATUS:
3626                 case ISTATE_SEND_STATUS_RECOVERY:
3627                         ret = iscsit_send_status(cmd, conn);
3628                         break;
3629                 case ISTATE_SEND_LOGOUTRSP:
3630                         ret = iscsit_send_logout_response(cmd, conn);
3631                         break;
3632                 case ISTATE_SEND_ASYNCMSG:
3633                         ret = iscsit_send_conn_drop_async_message(
3634                                 cmd, conn);
3635                         break;
3636                 case ISTATE_SEND_NOPIN:
3637                         ret = iscsit_send_nopin_response(cmd, conn);
3638                         break;
3639                 case ISTATE_SEND_REJECT:
3640                         ret = iscsit_send_reject(cmd, conn);
3641                         break;
3642                 case ISTATE_SEND_TASKMGTRSP:
3643                         ret = iscsit_send_task_mgt_rsp(cmd, conn);
3644                         if (ret != 0)
3645                                 break;
3646                         ret = iscsit_tmr_post_handler(cmd, conn);
3647                         if (ret != 0)
3648                                 iscsit_fall_back_to_erl0(conn->sess);
3649                         break;
3650                 case ISTATE_SEND_TEXTRSP:
3651                         ret = iscsit_send_text_rsp(cmd, conn);
3652                         break;
3653                 default:
3654                         pr_err("Unknown Opcode: 0x%02x ITT:"
3655                                " 0x%08x, i_state: %d on CID: %hu\n",
3656                                cmd->iscsi_opcode, cmd->init_task_tag,
3657                                state, conn->cid);
3658                         goto err;
3659                 }
3660                 if (ret < 0)
3661                         goto err;
3662
3663                 if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3664                         iscsit_tx_thread_wait_for_tcp(conn);
3665                         iscsit_unmap_iovec(cmd);
3666                         goto err;
3667                 }
3668                 iscsit_unmap_iovec(cmd);
3669
3670                 switch (state) {
3671                 case ISTATE_SEND_LOGOUTRSP:
3672                         if (!iscsit_logout_post_handler(cmd, conn))
3673                                 goto restart;
3674                         /* fall through */
3675                 case ISTATE_SEND_STATUS:
3676                 case ISTATE_SEND_ASYNCMSG:
3677                 case ISTATE_SEND_NOPIN:
3678                 case ISTATE_SEND_STATUS_RECOVERY:
3679                 case ISTATE_SEND_TEXTRSP:
3680                 case ISTATE_SEND_TASKMGTRSP:
3681                         spin_lock_bh(&cmd->istate_lock);
3682                         cmd->i_state = ISTATE_SENT_STATUS;
3683                         spin_unlock_bh(&cmd->istate_lock);
3684                         break;
3685                 case ISTATE_SEND_REJECT:
3686                         if (cmd->cmd_flags & ICF_REJECT_FAIL_CONN) {
3687                                 cmd->cmd_flags &= ~ICF_REJECT_FAIL_CONN;
3688                                 complete(&cmd->reject_comp);
3689                                 goto err;
3690                         }
3691                         complete(&cmd->reject_comp);
3692                         break;
3693                 default:
3694                         pr_err("Unknown Opcode: 0x%02x ITT:"
3695                                " 0x%08x, i_state: %d on CID: %hu\n",
3696                                cmd->iscsi_opcode, cmd->init_task_tag,
3697                                cmd->i_state, conn->cid);
3698                         goto err;
3699                 }
3700
3701                 if (atomic_read(&conn->check_immediate_queue))
3702                         break;
3703         }
3704
3705         return 0;
3706
3707 err:
3708         return -1;
3709 restart:
3710         return -EAGAIN;
3711 }
3712
3713 int iscsi_target_tx_thread(void *arg)
3714 {
3715         int ret = 0;
3716         struct iscsi_conn *conn;
3717         struct iscsi_thread_set *ts = arg;
3718         /*
3719          * Allow ourselves to be interrupted by SIGINT so that a
3720          * connection recovery / failure event can be triggered externally.
3721          */
3722         allow_signal(SIGINT);
3723
3724 restart:
3725         conn = iscsi_tx_thread_pre_handler(ts);
3726         if (!conn)
3727                 goto out;
3728
3729         ret = 0;
3730
3731         while (!kthread_should_stop()) {
3732                 /*
3733                  * Ensure that both TX and RX per connection kthreads
3734                  * are scheduled to run on the same CPU.
3735                  */
3736                 iscsit_thread_check_cpumask(conn, current, 1);
3737
3738                 schedule_timeout_interruptible(MAX_SCHEDULE_TIMEOUT);
3739
3740                 if ((ts->status == ISCSI_THREAD_SET_RESET) ||
3741                      signal_pending(current))
3742                         goto transport_err;
3743
3744                 ret = handle_immediate_queue(conn);
3745                 if (ret < 0)
3746                         goto transport_err;
3747
3748                 ret = handle_response_queue(conn);
3749                 if (ret == -EAGAIN)
3750                         goto restart;
3751                 else if (ret < 0)
3752                         goto transport_err;
3753         }
3754
3755 transport_err:
3756         iscsit_take_action_for_connection_exit(conn);
3757         goto restart;
3758 out:
3759         return 0;
3760 }
3761
3762 int iscsi_target_rx_thread(void *arg)
3763 {
3764         int ret;
3765         u8 buffer[ISCSI_HDR_LEN], opcode;
3766         u32 checksum = 0, digest = 0;
3767         struct iscsi_conn *conn = NULL;
3768         struct iscsi_thread_set *ts = arg;
3769         struct kvec iov;
3770         /*
3771          * Allow ourselves to be interrupted by SIGINT so that a
3772          * connection recovery / failure event can be triggered externally.
3773          */
3774         allow_signal(SIGINT);
3775
3776 restart:
3777         conn = iscsi_rx_thread_pre_handler(ts);
3778         if (!conn)
3779                 goto out;
3780
3781         while (!kthread_should_stop()) {
3782                 /*
3783                  * Ensure that both TX and RX per connection kthreads
3784                  * are scheduled to run on the same CPU.
3785                  */
3786                 iscsit_thread_check_cpumask(conn, current, 0);
3787
3788                 memset(buffer, 0, ISCSI_HDR_LEN);
3789                 memset(&iov, 0, sizeof(struct kvec));
3790
3791                 iov.iov_base    = buffer;
3792                 iov.iov_len     = ISCSI_HDR_LEN;
3793
3794                 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3795                 if (ret != ISCSI_HDR_LEN) {
3796                         iscsit_rx_thread_wait_for_tcp(conn);
3797                         goto transport_err;
3798                 }
3799
3800                 /*
3801                  * Set conn->bad_hdr for use with REJECT PDUs.
3802                  */
3803                 memcpy(&conn->bad_hdr, &buffer, ISCSI_HDR_LEN);
3804
3805                 if (conn->conn_ops->HeaderDigest) {
3806                         iov.iov_base    = &digest;
3807                         iov.iov_len     = ISCSI_CRC_LEN;
3808
3809                         ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3810                         if (ret != ISCSI_CRC_LEN) {
3811                                 iscsit_rx_thread_wait_for_tcp(conn);
3812                                 goto transport_err;
3813                         }
3814
3815                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
3816                                         buffer, ISCSI_HDR_LEN,
3817                                         0, NULL, (u8 *)&checksum);
3818
3819                         if (digest != checksum) {
3820                                 pr_err("HeaderDigest CRC32C failed,"
3821                                         " received 0x%08x, computed 0x%08x\n",
3822                                         digest, checksum);
3823                                 /*
3824                                  * Set the PDU to 0xff so it will intentionally
3825                                  * hit default in the switch below.
3826                                  */
3827                                 memset(buffer, 0xff, ISCSI_HDR_LEN);
3828                                 spin_lock_bh(&conn->sess->session_stats_lock);
3829                                 conn->sess->conn_digest_errors++;
3830                                 spin_unlock_bh(&conn->sess->session_stats_lock);
3831                         } else {
3832                                 pr_debug("Got HeaderDigest CRC32C"
3833                                                 " 0x%08x\n", checksum);
3834                         }
3835                 }
3836
3837                 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
3838                         goto transport_err;
3839
3840                 opcode = buffer[0] & ISCSI_OPCODE_MASK;
3841
3842                 if (conn->sess->sess_ops->SessionType &&
3843                    ((!(opcode & ISCSI_OP_TEXT)) ||
3844                     (!(opcode & ISCSI_OP_LOGOUT)))) {
3845                         pr_err("Received illegal iSCSI Opcode: 0x%02x"
3846                         " while in Discovery Session, rejecting.\n", opcode);
3847                         iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
3848                                         buffer, conn);
3849                         goto transport_err;
3850                 }
3851
3852                 switch (opcode) {
3853                 case ISCSI_OP_SCSI_CMD:
3854                         if (iscsit_handle_scsi_cmd(conn, buffer) < 0)
3855                                 goto transport_err;
3856                         break;
3857                 case ISCSI_OP_SCSI_DATA_OUT:
3858                         if (iscsit_handle_data_out(conn, buffer) < 0)
3859                                 goto transport_err;
3860                         break;
3861                 case ISCSI_OP_NOOP_OUT:
3862                         if (iscsit_handle_nop_out(conn, buffer) < 0)
3863                                 goto transport_err;
3864                         break;
3865                 case ISCSI_OP_SCSI_TMFUNC:
3866                         if (iscsit_handle_task_mgt_cmd(conn, buffer) < 0)
3867                                 goto transport_err;
3868                         break;
3869                 case ISCSI_OP_TEXT:
3870                         if (iscsit_handle_text_cmd(conn, buffer) < 0)
3871                                 goto transport_err;
3872                         break;
3873                 case ISCSI_OP_LOGOUT:
3874                         ret = iscsit_handle_logout_cmd(conn, buffer);
3875                         if (ret > 0) {
3876                                 wait_for_completion_timeout(&conn->conn_logout_comp,
3877                                                 SECONDS_FOR_LOGOUT_COMP * HZ);
3878                                 goto transport_err;
3879                         } else if (ret < 0)
3880                                 goto transport_err;
3881                         break;
3882                 case ISCSI_OP_SNACK:
3883                         if (iscsit_handle_snack(conn, buffer) < 0)
3884                                 goto transport_err;
3885                         break;
3886                 default:
3887                         pr_err("Got unknown iSCSI OpCode: 0x%02x\n",
3888                                         opcode);
3889                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3890                                 pr_err("Cannot recover from unknown"
3891                                 " opcode while ERL=0, closing iSCSI connection"
3892                                 ".\n");
3893                                 goto transport_err;
3894                         }
3895                         if (!conn->conn_ops->OFMarker) {
3896                                 pr_err("Unable to recover from unknown"
3897                                 " opcode while OFMarker=No, closing iSCSI"
3898                                         " connection.\n");
3899                                 goto transport_err;
3900                         }
3901                         if (iscsit_recover_from_unknown_opcode(conn) < 0) {
3902                                 pr_err("Unable to recover from unknown"
3903                                         " opcode, closing iSCSI connection.\n");
3904                                 goto transport_err;
3905                         }
3906                         break;
3907                 }
3908         }
3909
3910 transport_err:
3911         if (!signal_pending(current))
3912                 atomic_set(&conn->transport_failed, 1);
3913         iscsit_take_action_for_connection_exit(conn);
3914         goto restart;
3915 out:
3916         return 0;
3917 }
3918
3919 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
3920 {
3921         struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
3922         struct iscsi_session *sess = conn->sess;
3923         /*
3924          * We expect this function to only ever be called from either RX or TX
3925          * thread context via iscsit_close_connection() once the other context
3926          * has been reset -> returned sleeping pre-handler state.
3927          */
3928         spin_lock_bh(&conn->cmd_lock);
3929         list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) {
3930
3931                 list_del(&cmd->i_conn_node);
3932                 spin_unlock_bh(&conn->cmd_lock);
3933
3934                 iscsit_increment_maxcmdsn(cmd, sess);
3935
3936                 iscsit_free_cmd(cmd);
3937
3938                 spin_lock_bh(&conn->cmd_lock);
3939         }
3940         spin_unlock_bh(&conn->cmd_lock);
3941 }
3942
3943 static void iscsit_stop_timers_for_cmds(
3944         struct iscsi_conn *conn)
3945 {
3946         struct iscsi_cmd *cmd;
3947
3948         spin_lock_bh(&conn->cmd_lock);
3949         list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
3950                 if (cmd->data_direction == DMA_TO_DEVICE)
3951                         iscsit_stop_dataout_timer(cmd);
3952         }
3953         spin_unlock_bh(&conn->cmd_lock);
3954 }
3955
3956 int iscsit_close_connection(
3957         struct iscsi_conn *conn)
3958 {
3959         int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
3960         struct iscsi_session    *sess = conn->sess;
3961
3962         pr_debug("Closing iSCSI connection CID %hu on SID:"
3963                 " %u\n", conn->cid, sess->sid);
3964         /*
3965          * Always up conn_logout_comp just in case the RX Thread is sleeping
3966          * and the logout response never got sent because the connection
3967          * failed.
3968          */
3969         complete(&conn->conn_logout_comp);
3970
3971         iscsi_release_thread_set(conn);
3972
3973         iscsit_stop_timers_for_cmds(conn);
3974         iscsit_stop_nopin_response_timer(conn);
3975         iscsit_stop_nopin_timer(conn);
3976         iscsit_free_queue_reqs_for_conn(conn);
3977
3978         /*
3979          * During Connection recovery drop unacknowledged out of order
3980          * commands for this connection, and prepare the other commands
3981          * for realligence.
3982          *
3983          * During normal operation clear the out of order commands (but
3984          * do not free the struct iscsi_ooo_cmdsn's) and release all
3985          * struct iscsi_cmds.
3986          */
3987         if (atomic_read(&conn->connection_recovery)) {
3988                 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
3989                 iscsit_prepare_cmds_for_realligance(conn);
3990         } else {
3991                 iscsit_clear_ooo_cmdsns_for_conn(conn);
3992                 iscsit_release_commands_from_conn(conn);
3993         }
3994
3995         /*
3996          * Handle decrementing session or connection usage count if
3997          * a logout response was not able to be sent because the
3998          * connection failed.  Fall back to Session Recovery here.
3999          */
4000         if (atomic_read(&conn->conn_logout_remove)) {
4001                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4002                         iscsit_dec_conn_usage_count(conn);
4003                         iscsit_dec_session_usage_count(sess);
4004                 }
4005                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4006                         iscsit_dec_conn_usage_count(conn);
4007
4008                 atomic_set(&conn->conn_logout_remove, 0);
4009                 atomic_set(&sess->session_reinstatement, 0);
4010                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4011         }
4012
4013         spin_lock_bh(&sess->conn_lock);
4014         list_del(&conn->conn_list);
4015
4016         /*
4017          * Attempt to let the Initiator know this connection failed by
4018          * sending an Connection Dropped Async Message on another
4019          * active connection.
4020          */
4021         if (atomic_read(&conn->connection_recovery))
4022                 iscsit_build_conn_drop_async_message(conn);
4023
4024         spin_unlock_bh(&sess->conn_lock);
4025
4026         /*
4027          * If connection reinstatement is being performed on this connection,
4028          * up the connection reinstatement semaphore that is being blocked on
4029          * in iscsit_cause_connection_reinstatement().
4030          */
4031         spin_lock_bh(&conn->state_lock);
4032         if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4033                 spin_unlock_bh(&conn->state_lock);
4034                 complete(&conn->conn_wait_comp);
4035                 wait_for_completion(&conn->conn_post_wait_comp);
4036                 spin_lock_bh(&conn->state_lock);
4037         }
4038
4039         /*
4040          * If connection reinstatement is being performed on this connection
4041          * by receiving a REMOVECONNFORRECOVERY logout request, up the
4042          * connection wait rcfr semaphore that is being blocked on
4043          * an iscsit_connection_reinstatement_rcfr().
4044          */
4045         if (atomic_read(&conn->connection_wait_rcfr)) {
4046                 spin_unlock_bh(&conn->state_lock);
4047                 complete(&conn->conn_wait_rcfr_comp);
4048                 wait_for_completion(&conn->conn_post_wait_comp);
4049                 spin_lock_bh(&conn->state_lock);
4050         }
4051         atomic_set(&conn->connection_reinstatement, 1);
4052         spin_unlock_bh(&conn->state_lock);
4053
4054         /*
4055          * If any other processes are accessing this connection pointer we
4056          * must wait until they have completed.
4057          */
4058         iscsit_check_conn_usage_count(conn);
4059
4060         if (conn->conn_rx_hash.tfm)
4061                 crypto_free_hash(conn->conn_rx_hash.tfm);
4062         if (conn->conn_tx_hash.tfm)
4063                 crypto_free_hash(conn->conn_tx_hash.tfm);
4064
4065         if (conn->conn_cpumask)
4066                 free_cpumask_var(conn->conn_cpumask);
4067
4068         kfree(conn->conn_ops);
4069         conn->conn_ops = NULL;
4070
4071         if (conn->sock)
4072                 sock_release(conn->sock);
4073         conn->thread_set = NULL;
4074
4075         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4076         conn->conn_state = TARG_CONN_STATE_FREE;
4077         kfree(conn);
4078
4079         spin_lock_bh(&sess->conn_lock);
4080         atomic_dec(&sess->nconn);
4081         pr_debug("Decremented iSCSI connection count to %hu from node:"
4082                 " %s\n", atomic_read(&sess->nconn),
4083                 sess->sess_ops->InitiatorName);
4084         /*
4085          * Make sure that if one connection fails in an non ERL=2 iSCSI
4086          * Session that they all fail.
4087          */
4088         if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4089              !atomic_read(&sess->session_logout))
4090                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4091
4092         /*
4093          * If this was not the last connection in the session, and we are
4094          * performing session reinstatement or falling back to ERL=0, call
4095          * iscsit_stop_session() without sleeping to shutdown the other
4096          * active connections.
4097          */
4098         if (atomic_read(&sess->nconn)) {
4099                 if (!atomic_read(&sess->session_reinstatement) &&
4100                     !atomic_read(&sess->session_fall_back_to_erl0)) {
4101                         spin_unlock_bh(&sess->conn_lock);
4102                         return 0;
4103                 }
4104                 if (!atomic_read(&sess->session_stop_active)) {
4105                         atomic_set(&sess->session_stop_active, 1);
4106                         spin_unlock_bh(&sess->conn_lock);
4107                         iscsit_stop_session(sess, 0, 0);
4108                         return 0;
4109                 }
4110                 spin_unlock_bh(&sess->conn_lock);
4111                 return 0;
4112         }
4113
4114         /*
4115          * If this was the last connection in the session and one of the
4116          * following is occurring:
4117          *
4118          * Session Reinstatement is not being performed, and are falling back
4119          * to ERL=0 call iscsit_close_session().
4120          *
4121          * Session Logout was requested.  iscsit_close_session() will be called
4122          * elsewhere.
4123          *
4124          * Session Continuation is not being performed, start the Time2Retain
4125          * handler and check if sleep_on_sess_wait_sem is active.
4126          */
4127         if (!atomic_read(&sess->session_reinstatement) &&
4128              atomic_read(&sess->session_fall_back_to_erl0)) {
4129                 spin_unlock_bh(&sess->conn_lock);
4130                 target_put_session(sess->se_sess);
4131
4132                 return 0;
4133         } else if (atomic_read(&sess->session_logout)) {
4134                 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4135                 sess->session_state = TARG_SESS_STATE_FREE;
4136                 spin_unlock_bh(&sess->conn_lock);
4137
4138                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4139                         complete(&sess->session_wait_comp);
4140
4141                 return 0;
4142         } else {
4143                 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4144                 sess->session_state = TARG_SESS_STATE_FAILED;
4145
4146                 if (!atomic_read(&sess->session_continuation)) {
4147                         spin_unlock_bh(&sess->conn_lock);
4148                         iscsit_start_time2retain_handler(sess);
4149                 } else
4150                         spin_unlock_bh(&sess->conn_lock);
4151
4152                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4153                         complete(&sess->session_wait_comp);
4154
4155                 return 0;
4156         }
4157         spin_unlock_bh(&sess->conn_lock);
4158
4159         return 0;
4160 }
4161
4162 int iscsit_close_session(struct iscsi_session *sess)
4163 {
4164         struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess);
4165         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4166
4167         if (atomic_read(&sess->nconn)) {
4168                 pr_err("%d connection(s) still exist for iSCSI session"
4169                         " to %s\n", atomic_read(&sess->nconn),
4170                         sess->sess_ops->InitiatorName);
4171                 BUG();
4172         }
4173
4174         spin_lock_bh(&se_tpg->session_lock);
4175         atomic_set(&sess->session_logout, 1);
4176         atomic_set(&sess->session_reinstatement, 1);
4177         iscsit_stop_time2retain_timer(sess);
4178         spin_unlock_bh(&se_tpg->session_lock);
4179
4180         /*
4181          * transport_deregister_session_configfs() will clear the
4182          * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4183          * can be setting it again with __transport_register_session() in
4184          * iscsi_post_login_handler() again after the iscsit_stop_session()
4185          * completes in iscsi_np context.
4186          */
4187         transport_deregister_session_configfs(sess->se_sess);
4188
4189         /*
4190          * If any other processes are accessing this session pointer we must
4191          * wait until they have completed.  If we are in an interrupt (the
4192          * time2retain handler) and contain and active session usage count we
4193          * restart the timer and exit.
4194          */
4195         if (!in_interrupt()) {
4196                 if (iscsit_check_session_usage_count(sess) == 1)
4197                         iscsit_stop_session(sess, 1, 1);
4198         } else {
4199                 if (iscsit_check_session_usage_count(sess) == 2) {
4200                         atomic_set(&sess->session_logout, 0);
4201                         iscsit_start_time2retain_handler(sess);
4202                         return 0;
4203                 }
4204         }
4205
4206         transport_deregister_session(sess->se_sess);
4207
4208         if (sess->sess_ops->ErrorRecoveryLevel == 2)
4209                 iscsit_free_connection_recovery_entires(sess);
4210
4211         iscsit_free_all_ooo_cmdsns(sess);
4212
4213         spin_lock_bh(&se_tpg->session_lock);
4214         pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4215         sess->session_state = TARG_SESS_STATE_FREE;
4216         pr_debug("Released iSCSI session from node: %s\n",
4217                         sess->sess_ops->InitiatorName);
4218         tpg->nsessions--;
4219         if (tpg->tpg_tiqn)
4220                 tpg->tpg_tiqn->tiqn_nsessions--;
4221
4222         pr_debug("Decremented number of active iSCSI Sessions on"
4223                 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4224
4225         spin_lock(&sess_idr_lock);
4226         idr_remove(&sess_idr, sess->session_index);
4227         spin_unlock(&sess_idr_lock);
4228
4229         kfree(sess->sess_ops);
4230         sess->sess_ops = NULL;
4231         spin_unlock_bh(&se_tpg->session_lock);
4232
4233         kfree(sess);
4234         return 0;
4235 }
4236
4237 static void iscsit_logout_post_handler_closesession(
4238         struct iscsi_conn *conn)
4239 {
4240         struct iscsi_session *sess = conn->sess;
4241
4242         iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4243         iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4244
4245         atomic_set(&conn->conn_logout_remove, 0);
4246         complete(&conn->conn_logout_comp);
4247
4248         iscsit_dec_conn_usage_count(conn);
4249         iscsit_stop_session(sess, 1, 1);
4250         iscsit_dec_session_usage_count(sess);
4251         target_put_session(sess->se_sess);
4252 }
4253
4254 static void iscsit_logout_post_handler_samecid(
4255         struct iscsi_conn *conn)
4256 {
4257         iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4258         iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4259
4260         atomic_set(&conn->conn_logout_remove, 0);
4261         complete(&conn->conn_logout_comp);
4262
4263         iscsit_cause_connection_reinstatement(conn, 1);
4264         iscsit_dec_conn_usage_count(conn);
4265 }
4266
4267 static void iscsit_logout_post_handler_diffcid(
4268         struct iscsi_conn *conn,
4269         u16 cid)
4270 {
4271         struct iscsi_conn *l_conn;
4272         struct iscsi_session *sess = conn->sess;
4273
4274         if (!sess)
4275                 return;
4276
4277         spin_lock_bh(&sess->conn_lock);
4278         list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4279                 if (l_conn->cid == cid) {
4280                         iscsit_inc_conn_usage_count(l_conn);
4281                         break;
4282                 }
4283         }
4284         spin_unlock_bh(&sess->conn_lock);
4285
4286         if (!l_conn)
4287                 return;
4288
4289         if (l_conn->sock)
4290                 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4291
4292         spin_lock_bh(&l_conn->state_lock);
4293         pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4294         l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4295         spin_unlock_bh(&l_conn->state_lock);
4296
4297         iscsit_cause_connection_reinstatement(l_conn, 1);
4298         iscsit_dec_conn_usage_count(l_conn);
4299 }
4300
4301 /*
4302  *      Return of 0 causes the TX thread to restart.
4303  */
4304 static int iscsit_logout_post_handler(
4305         struct iscsi_cmd *cmd,
4306         struct iscsi_conn *conn)
4307 {
4308         int ret = 0;
4309
4310         switch (cmd->logout_reason) {
4311         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4312                 switch (cmd->logout_response) {
4313                 case ISCSI_LOGOUT_SUCCESS:
4314                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4315                 default:
4316                         iscsit_logout_post_handler_closesession(conn);
4317                         break;
4318                 }
4319                 ret = 0;
4320                 break;
4321         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4322                 if (conn->cid == cmd->logout_cid) {
4323                         switch (cmd->logout_response) {
4324                         case ISCSI_LOGOUT_SUCCESS:
4325                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4326                         default:
4327                                 iscsit_logout_post_handler_samecid(conn);
4328                                 break;
4329                         }
4330                         ret = 0;
4331                 } else {
4332                         switch (cmd->logout_response) {
4333                         case ISCSI_LOGOUT_SUCCESS:
4334                                 iscsit_logout_post_handler_diffcid(conn,
4335                                         cmd->logout_cid);
4336                                 break;
4337                         case ISCSI_LOGOUT_CID_NOT_FOUND:
4338                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4339                         default:
4340                                 break;
4341                         }
4342                         ret = 1;
4343                 }
4344                 break;
4345         case ISCSI_LOGOUT_REASON_RECOVERY:
4346                 switch (cmd->logout_response) {
4347                 case ISCSI_LOGOUT_SUCCESS:
4348                 case ISCSI_LOGOUT_CID_NOT_FOUND:
4349                 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4350                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4351                 default:
4352                         break;
4353                 }
4354                 ret = 1;
4355                 break;
4356         default:
4357                 break;
4358
4359         }
4360         return ret;
4361 }
4362
4363 void iscsit_fail_session(struct iscsi_session *sess)
4364 {
4365         struct iscsi_conn *conn;
4366
4367         spin_lock_bh(&sess->conn_lock);
4368         list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4369                 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4370                 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4371         }
4372         spin_unlock_bh(&sess->conn_lock);
4373
4374         pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4375         sess->session_state = TARG_SESS_STATE_FAILED;
4376 }
4377
4378 int iscsit_free_session(struct iscsi_session *sess)
4379 {
4380         u16 conn_count = atomic_read(&sess->nconn);
4381         struct iscsi_conn *conn, *conn_tmp = NULL;
4382         int is_last;
4383
4384         spin_lock_bh(&sess->conn_lock);
4385         atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4386
4387         list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4388                         conn_list) {
4389                 if (conn_count == 0)
4390                         break;
4391
4392                 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4393                         is_last = 1;
4394                 } else {
4395                         iscsit_inc_conn_usage_count(conn_tmp);
4396                         is_last = 0;
4397                 }
4398                 iscsit_inc_conn_usage_count(conn);
4399
4400                 spin_unlock_bh(&sess->conn_lock);
4401                 iscsit_cause_connection_reinstatement(conn, 1);
4402                 spin_lock_bh(&sess->conn_lock);
4403
4404                 iscsit_dec_conn_usage_count(conn);
4405                 if (is_last == 0)
4406                         iscsit_dec_conn_usage_count(conn_tmp);
4407
4408                 conn_count--;
4409         }
4410
4411         if (atomic_read(&sess->nconn)) {
4412                 spin_unlock_bh(&sess->conn_lock);
4413                 wait_for_completion(&sess->session_wait_comp);
4414         } else
4415                 spin_unlock_bh(&sess->conn_lock);
4416
4417         target_put_session(sess->se_sess);
4418         return 0;
4419 }
4420
4421 void iscsit_stop_session(
4422         struct iscsi_session *sess,
4423         int session_sleep,
4424         int connection_sleep)
4425 {
4426         u16 conn_count = atomic_read(&sess->nconn);
4427         struct iscsi_conn *conn, *conn_tmp = NULL;
4428         int is_last;
4429
4430         spin_lock_bh(&sess->conn_lock);
4431         if (session_sleep)
4432                 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4433
4434         if (connection_sleep) {
4435                 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4436                                 conn_list) {
4437                         if (conn_count == 0)
4438                                 break;
4439
4440                         if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4441                                 is_last = 1;
4442                         } else {
4443                                 iscsit_inc_conn_usage_count(conn_tmp);
4444                                 is_last = 0;
4445                         }
4446                         iscsit_inc_conn_usage_count(conn);
4447
4448                         spin_unlock_bh(&sess->conn_lock);
4449                         iscsit_cause_connection_reinstatement(conn, 1);
4450                         spin_lock_bh(&sess->conn_lock);
4451
4452                         iscsit_dec_conn_usage_count(conn);
4453                         if (is_last == 0)
4454                                 iscsit_dec_conn_usage_count(conn_tmp);
4455                         conn_count--;
4456                 }
4457         } else {
4458                 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4459                         iscsit_cause_connection_reinstatement(conn, 0);
4460         }
4461
4462         if (session_sleep && atomic_read(&sess->nconn)) {
4463                 spin_unlock_bh(&sess->conn_lock);
4464                 wait_for_completion(&sess->session_wait_comp);
4465         } else
4466                 spin_unlock_bh(&sess->conn_lock);
4467 }
4468
4469 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4470 {
4471         struct iscsi_session *sess;
4472         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4473         struct se_session *se_sess, *se_sess_tmp;
4474         int session_count = 0;
4475
4476         spin_lock_bh(&se_tpg->session_lock);
4477         if (tpg->nsessions && !force) {
4478                 spin_unlock_bh(&se_tpg->session_lock);
4479                 return -1;
4480         }
4481
4482         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4483                         sess_list) {
4484                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4485
4486                 spin_lock(&sess->conn_lock);
4487                 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4488                     atomic_read(&sess->session_logout) ||
4489                     (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4490                         spin_unlock(&sess->conn_lock);
4491                         continue;
4492                 }
4493                 atomic_set(&sess->session_reinstatement, 1);
4494                 spin_unlock(&sess->conn_lock);
4495                 spin_unlock_bh(&se_tpg->session_lock);
4496
4497                 iscsit_free_session(sess);
4498                 spin_lock_bh(&se_tpg->session_lock);
4499
4500                 session_count++;
4501         }
4502         spin_unlock_bh(&se_tpg->session_lock);
4503
4504         pr_debug("Released %d iSCSI Session(s) from Target Portal"
4505                         " Group: %hu\n", session_count, tpg->tpgt);
4506         return 0;
4507 }
4508
4509 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4510 MODULE_VERSION("4.1.x");
4511 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4512 MODULE_LICENSE("GPL");
4513
4514 module_init(iscsi_target_init_module);
4515 module_exit(iscsi_target_cleanup_module);