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 static 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
 789         /* FIXME; Add checks for AdditionalHeaderSegment */
 790
 791         if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
 792             !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
 793                 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
 794                                 " not set. Bad iSCSI Initiator.\n");
 795                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
 796                                 buf, conn);
 797         }
 798
 799         if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
 800              (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
 801                 /*
 802                  * Vmware ESX v3.0 uses a modified Cisco Initiator (v3.4.2)
 803                  * that adds support for RESERVE/RELEASE.  There is a bug
 804                  * add with this new functionality that sets R/W bits when
 805                  * neither CDB carries any READ or WRITE datapayloads.
 806                  */
 807                 if ((hdr->cdb[0] == 0x16) || (hdr->cdb[0] == 0x17)) {
 808                         hdr->flags &= ~ISCSI_FLAG_CMD_READ;
 809                         hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
 810                         goto done;
 811                 }
 812
 813                 pr_err("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
 814                         " set when Expected Data Transfer Length is 0 for"
 815                         " CDB: 0x%02x. Bad iSCSI Initiator.\n", hdr->cdb[0]);
 816                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
 817                                 buf, conn);
 818         }
 819 done:
 820
 821         if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
 822             !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
 823                 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
 824                         " MUST be set if Expected Data Transfer Length is not 0."
 825                         " Bad iSCSI Initiator\n");
 826                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
 827                                 buf, conn);
 828         }
 829
 830         if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
 831             (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
 832                 pr_err("Bidirectional operations not supported!\n");
 833                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
 834                                 buf, conn);
 835         }
 836
 837         if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
 838                 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
 839                                 " Scsi Command PDU.\n");
 840                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
 841                                 buf, conn);
 842         }
 843
 844         if (payload_length && !conn->sess->sess_ops->ImmediateData) {
 845                 pr_err("ImmediateData=No but DataSegmentLength=%u,"
 846                         " protocol error.\n", payload_length);
 847                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
 848                                 buf, conn);
 849         }
 850
 851         if ((be32_to_cpu(hdr->data_length )== payload_length) &&
 852             (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
 853                 pr_err("Expected Data Transfer Length and Length of"
 854                         " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
 855                         " bit is not set protocol error\n");
 856                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
 857                                 buf, conn);
 858         }
 859
 860         if (payload_length > be32_to_cpu(hdr->data_length)) {
 861                 pr_err("DataSegmentLength: %u is greater than"
 862                         " EDTL: %u, protocol error.\n", payload_length,
 863                                 hdr->data_length);
 864                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
 865                                 buf, conn);
 866         }
 867
 868         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
 869                 pr_err("DataSegmentLength: %u is greater than"
 870                         " MaxXmitDataSegmentLength: %u, protocol error.\n",
 871                         payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
 872                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
 873                                 buf, conn);
 874         }
 875
 876         if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
 877                 pr_err("DataSegmentLength: %u is greater than"
 878                         " FirstBurstLength: %u, protocol error.\n",
 879                         payload_length, conn->sess->sess_ops->FirstBurstLength);
 880                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_INVALID, 1,
 881                                         buf, conn);
 882         }
 883
 884         data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
 885                          (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
 886                           DMA_NONE;
 887
 888         cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
 889         if (!cmd)
 890                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1,
 891                                          buf, conn);
 892
 893         cmd->data_direction = data_direction;
 894         iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
 895         /*
 896          * Figure out the SAM Task Attribute for the incoming SCSI CDB
 897          */
 898         if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
 899             (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
 900                 sam_task_attr = MSG_SIMPLE_TAG;
 901         else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
 902                 sam_task_attr = MSG_ORDERED_TAG;
 903         else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
 904                 sam_task_attr = MSG_HEAD_TAG;
 905         else if (iscsi_task_attr == ISCSI_ATTR_ACA)
 906                 sam_task_attr = MSG_ACA_TAG;
 907         else {
 908                 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
 909                         " MSG_SIMPLE_TAG\n", iscsi_task_attr);
 910                 sam_task_attr = MSG_SIMPLE_TAG;
 911         }
 912
 913         cmd->iscsi_opcode       = ISCSI_OP_SCSI_CMD;
 914         cmd->i_state            = ISTATE_NEW_CMD;
 915         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
 916         cmd->immediate_data     = (payload_length) ? 1 : 0;
 917         cmd->unsolicited_data   = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
 918                                      (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
 919         if (cmd->unsolicited_data)
 920                 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
 921
 922         conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
 923         if (hdr->flags & ISCSI_FLAG_CMD_READ) {
 924                 spin_lock_bh(&conn->sess->ttt_lock);
 925                 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
 926                 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
 927                         cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
 928                 spin_unlock_bh(&conn->sess->ttt_lock);
 929         } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
 930                 cmd->targ_xfer_tag = 0xFFFFFFFF;
 931         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
 932         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
 933         cmd->first_burst_len    = payload_length;
 934
 935         if (cmd->data_direction == DMA_FROM_DEVICE) {
 936                 struct iscsi_datain_req *dr;
 937
 938                 dr = iscsit_allocate_datain_req();
 939                 if (!dr)
 940                         return iscsit_add_reject_from_cmd(
 941                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES,
 942                                         1, 1, buf, cmd);
 943
 944                 iscsit_attach_datain_req(cmd, dr);
 945         }
 946
 947         /*
 948          * Initialize struct se_cmd descriptor from target_core_mod infrastructure
 949          */
 950         transport_init_se_cmd(&cmd->se_cmd, &lio_target_fabric_configfs->tf_ops,
 951                         conn->sess->se_sess, be32_to_cpu(hdr->data_length),
 952                         cmd->data_direction, sam_task_attr,
 953                         cmd->sense_buffer + 2);
 954
 955         pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
 956                 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
 957                 hdr->cmdsn, hdr->data_length, payload_length, conn->cid);
 958
 959         /*
 960          * The CDB is going to an se_device_t.
 961          */
 962         ret = transport_lookup_cmd_lun(&cmd->se_cmd,
 963                                        scsilun_to_int(&hdr->lun));
 964         if (ret < 0) {
 965                 if (cmd->se_cmd.scsi_sense_reason == TCM_NON_EXISTENT_LUN) {
 966                         pr_debug("Responding to non-acl'ed,"
 967                                 " non-existent or non-exported iSCSI LUN:"
 968                                 " 0x%016Lx\n", get_unaligned_le64(&hdr->lun));
 969                 }
 970                 send_check_condition = 1;
 971                 goto attach_cmd;
 972         }
 973
 974         transport_ret = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
 975         if (transport_ret == -ENOMEM) {
 976                 return iscsit_add_reject_from_cmd(
 977                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
 978                                 1, 1, buf, cmd);
 979         } else if (transport_ret < 0) {
 980                 /*
 981                  * Unsupported SAM Opcode.  CHECK_CONDITION will be sent
 982                  * in iscsit_execute_cmd() during the CmdSN OOO Execution
 983                  * Mechinism.
 984                  */
 985                 send_check_condition = 1;
 986         } else {
 987                 if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0)
 988                         return iscsit_add_reject_from_cmd(
 989                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
 990                                 1, 1, buf, cmd);
 991         }
 992
 993 attach_cmd:
 994         spin_lock_bh(&conn->cmd_lock);
 995         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 996         spin_unlock_bh(&conn->cmd_lock);
 997         /*
 998          * Check if we need to delay processing because of ALUA
 999          * Active/NonOptimized primary access state..
1000          */
1001         core_alua_check_nonop_delay(&cmd->se_cmd);
1002
1003         ret = iscsit_allocate_iovecs(cmd);
1004         if (ret < 0)
1005                 return iscsit_add_reject_from_cmd(
1006                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1007                                 1, 0, buf, cmd);
1008         /*
1009          * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1010          * the Immediate Bit is not set, and no Immediate
1011          * Data is attached.
1012          *
1013          * A PDU/CmdSN carrying Immediate Data can only
1014          * be processed after the DataCRC has passed.
1015          * If the DataCRC fails, the CmdSN MUST NOT
1016          * be acknowledged. (See below)
1017          */
1018         if (!cmd->immediate_data) {
1019                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1020                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1021                         return 0;
1022                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1023                         return iscsit_add_reject_from_cmd(
1024                                 ISCSI_REASON_PROTOCOL_ERROR,
1025                                 1, 0, buf, cmd);
1026         }
1027
1028         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1029
1030         /*
1031          * If no Immediate Data is attached, it's OK to return now.
1032          */
1033         if (!cmd->immediate_data) {
1034                 if (send_check_condition)
1035                         return 0;
1036
1037                 if (cmd->unsolicited_data) {
1038                         iscsit_set_dataout_sequence_values(cmd);
1039
1040                         spin_lock_bh(&cmd->dataout_timeout_lock);
1041                         iscsit_start_dataout_timer(cmd, cmd->conn);
1042                         spin_unlock_bh(&cmd->dataout_timeout_lock);
1043                 }
1044
1045                 return 0;
1046         }
1047
1048         /*
1049          * Early CHECK_CONDITIONs never make it to the transport processing
1050          * thread.  They are processed in CmdSN order by
1051          * iscsit_check_received_cmdsn() below.
1052          */
1053         if (send_check_condition) {
1054                 immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1055                 dump_immediate_data = 1;
1056                 goto after_immediate_data;
1057         }
1058         /*
1059          * Call directly into transport_generic_new_cmd() to perform
1060          * the backend memory allocation.
1061          */
1062         ret = transport_generic_new_cmd(&cmd->se_cmd);
1063         if (ret < 0) {
1064                 immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1065                 dump_immediate_data = 1;
1066                 goto after_immediate_data;
1067         }
1068
1069         immed_ret = iscsit_handle_immediate_data(cmd, buf, payload_length);
1070 after_immediate_data:
1071         if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1072                 /*
1073                  * A PDU/CmdSN carrying Immediate Data passed
1074                  * DataCRC, check against ExpCmdSN/MaxCmdSN if
1075                  * Immediate Bit is not set.
1076                  */
1077                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1078                 /*
1079                  * Special case for Unsupported SAM WRITE Opcodes
1080                  * and ImmediateData=Yes.
1081                  */
1082                 if (dump_immediate_data) {
1083                         if (iscsit_dump_data_payload(conn, payload_length, 1) < 0)
1084                                 return -1;
1085                 } else if (cmd->unsolicited_data) {
1086                         iscsit_set_dataout_sequence_values(cmd);
1087
1088                         spin_lock_bh(&cmd->dataout_timeout_lock);
1089                         iscsit_start_dataout_timer(cmd, cmd->conn);
1090                         spin_unlock_bh(&cmd->dataout_timeout_lock);
1091                 }
1092
1093                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1094                         return iscsit_add_reject_from_cmd(
1095                                 ISCSI_REASON_PROTOCOL_ERROR,
1096                                 1, 0, buf, cmd);
1097
1098         } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1099                 /*
1100                  * Immediate Data failed DataCRC and ERL>=1,
1101                  * silently drop this PDU and let the initiator
1102                  * plug the CmdSN gap.
1103                  *
1104                  * FIXME: Send Unsolicited NOPIN with reserved
1105                  * TTT here to help the initiator figure out
1106                  * the missing CmdSN, although they should be
1107                  * intelligent enough to determine the missing
1108                  * CmdSN and issue a retry to plug the sequence.
1109                  */
1110                 cmd->i_state = ISTATE_REMOVE;
1111                 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
1112         } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1113                 return -1;
1114
1115         return 0;
1116 }
1117
1118 static u32 iscsit_do_crypto_hash_sg(
1119         struct hash_desc *hash,
1120         struct iscsi_cmd *cmd,
1121         u32 data_offset,
1122         u32 data_length,
1123         u32 padding,
1124         u8 *pad_bytes)
1125 {
1126         u32 data_crc;
1127         u32 i;
1128         struct scatterlist *sg;
1129         unsigned int page_off;
1130
1131         crypto_hash_init(hash);
1132
1133         sg = cmd->first_data_sg;
1134         page_off = cmd->first_data_sg_off;
1135
1136         i = 0;
1137         while (data_length) {
1138                 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1139
1140                 crypto_hash_update(hash, &sg[i], cur_len);
1141
1142                 data_length -= cur_len;
1143                 page_off = 0;
1144                 i++;
1145         }
1146
1147         if (padding) {
1148                 struct scatterlist pad_sg;
1149
1150                 sg_init_one(&pad_sg, pad_bytes, padding);
1151                 crypto_hash_update(hash, &pad_sg, padding);
1152         }
1153         crypto_hash_final(hash, (u8 *) &data_crc);
1154
1155         return data_crc;
1156 }
1157
1158 static void iscsit_do_crypto_hash_buf(
1159         struct hash_desc *hash,
1160         unsigned char *buf,
1161         u32 payload_length,
1162         u32 padding,
1163         u8 *pad_bytes,
1164         u8 *data_crc)
1165 {
1166         struct scatterlist sg;
1167
1168         crypto_hash_init(hash);
1169
1170         sg_init_one(&sg, buf, payload_length);
1171         crypto_hash_update(hash, &sg, payload_length);
1172
1173         if (padding) {
1174                 sg_init_one(&sg, pad_bytes, padding);
1175                 crypto_hash_update(hash, &sg, padding);
1176         }
1177         crypto_hash_final(hash, data_crc);
1178 }
1179
1180 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1181 {
1182         int iov_ret, ooo_cmdsn = 0, ret;
1183         u8 data_crc_failed = 0;
1184         u32 checksum, iov_count = 0, padding = 0, rx_got = 0;
1185         u32 rx_size = 0, payload_length;
1186         struct iscsi_cmd *cmd = NULL;
1187         struct se_cmd *se_cmd;
1188         struct iscsi_data *hdr;
1189         struct kvec *iov;
1190         unsigned long flags;
1191
1192         hdr                     = (struct iscsi_data *) buf;
1193         payload_length          = ntoh24(hdr->dlength);
1194
1195         if (!payload_length) {
1196                 pr_err("DataOUT payload is ZERO, protocol error.\n");
1197                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1198                                         buf, conn);
1199         }
1200
1201         /* iSCSI write */
1202         spin_lock_bh(&conn->sess->session_stats_lock);
1203         conn->sess->rx_data_octets += payload_length;
1204         if (conn->sess->se_sess->se_node_acl) {
1205                 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
1206                 conn->sess->se_sess->se_node_acl->write_bytes += payload_length;
1207                 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
1208         }
1209         spin_unlock_bh(&conn->sess->session_stats_lock);
1210
1211         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1212                 pr_err("DataSegmentLength: %u is greater than"
1213                         " MaxXmitDataSegmentLength: %u\n", payload_length,
1214                         conn->conn_ops->MaxXmitDataSegmentLength);
1215                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1216                                         buf, conn);
1217         }
1218
1219         cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1220                         payload_length);
1221         if (!cmd)
1222                 return 0;
1223
1224         pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1225                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1226                 hdr->itt, hdr->ttt, hdr->datasn, hdr->offset,
1227                 payload_length, conn->cid);
1228
1229         if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1230                 pr_err("Command ITT: 0x%08x received DataOUT after"
1231                         " last DataOUT received, dumping payload\n",
1232                         cmd->init_task_tag);
1233                 return iscsit_dump_data_payload(conn, payload_length, 1);
1234         }
1235
1236         if (cmd->data_direction != DMA_TO_DEVICE) {
1237                 pr_err("Command ITT: 0x%08x received DataOUT for a"
1238                         " NON-WRITE command.\n", cmd->init_task_tag);
1239                 return iscsit_add_reject_from_cmd(ISCSI_REASON_PROTOCOL_ERROR,
1240                                 1, 0, buf, cmd);
1241         }
1242         se_cmd = &cmd->se_cmd;
1243         iscsit_mod_dataout_timer(cmd);
1244
1245         if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1246                 pr_err("DataOut Offset: %u, Length %u greater than"
1247                         " iSCSI Command EDTL %u, protocol error.\n",
1248                         hdr->offset, payload_length, cmd->se_cmd.data_length);
1249                 return iscsit_add_reject_from_cmd(ISCSI_REASON_BOOKMARK_INVALID,
1250                                 1, 0, buf, cmd);
1251         }
1252
1253         if (cmd->unsolicited_data) {
1254                 int dump_unsolicited_data = 0;
1255
1256                 if (conn->sess->sess_ops->InitialR2T) {
1257                         pr_err("Received unexpected unsolicited data"
1258                                 " while InitialR2T=Yes, protocol error.\n");
1259                         transport_send_check_condition_and_sense(&cmd->se_cmd,
1260                                         TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1261                         return -1;
1262                 }
1263                 /*
1264                  * Special case for dealing with Unsolicited DataOUT
1265                  * and Unsupported SAM WRITE Opcodes and SE resource allocation
1266                  * failures;
1267                  */
1268
1269                 /* Something's amiss if we're not in WRITE_PENDING state... */
1270                 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1271                 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1272                 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1273
1274                 spin_lock_irqsave(&se_cmd->t_state_lock, flags);
1275                 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE) ||
1276                      (se_cmd->se_cmd_flags & SCF_SCSI_CDB_EXCEPTION))
1277                         dump_unsolicited_data = 1;
1278                 spin_unlock_irqrestore(&se_cmd->t_state_lock, flags);
1279
1280                 if (dump_unsolicited_data) {
1281                         /*
1282                          * Check if a delayed TASK_ABORTED status needs to
1283                          * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1284                          * received with the unsolicitied data out.
1285                          */
1286                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1287                                 iscsit_stop_dataout_timer(cmd);
1288
1289                         transport_check_aborted_status(se_cmd,
1290                                         (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1291                         return iscsit_dump_data_payload(conn, payload_length, 1);
1292                 }
1293         } else {
1294                 /*
1295                  * For the normal solicited data path:
1296                  *
1297                  * Check for a delayed TASK_ABORTED status and dump any
1298                  * incoming data out payload if one exists.  Also, when the
1299                  * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1300                  * data out sequence, we decrement outstanding_r2ts.  Once
1301                  * outstanding_r2ts reaches zero, go ahead and send the delayed
1302                  * TASK_ABORTED status.
1303                  */
1304                 if (se_cmd->transport_state & CMD_T_ABORTED) {
1305                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1306                                 if (--cmd->outstanding_r2ts < 1) {
1307                                         iscsit_stop_dataout_timer(cmd);
1308                                         transport_check_aborted_status(
1309                                                         se_cmd, 1);
1310                                 }
1311
1312                         return iscsit_dump_data_payload(conn, payload_length, 1);
1313                 }
1314         }
1315         /*
1316          * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1317          * within-command recovery checks before receiving the payload.
1318          */
1319         ret = iscsit_check_pre_dataout(cmd, buf);
1320         if (ret == DATAOUT_WITHIN_COMMAND_RECOVERY)
1321                 return 0;
1322         else if (ret == DATAOUT_CANNOT_RECOVER)
1323                 return -1;
1324
1325         rx_size += payload_length;
1326         iov = &cmd->iov_data[0];
1327
1328         iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1329                                    payload_length);
1330         if (iov_ret < 0)
1331                 return -1;
1332
1333         iov_count += iov_ret;
1334
1335         padding = ((-payload_length) & 3);
1336         if (padding != 0) {
1337                 iov[iov_count].iov_base = cmd->pad_bytes;
1338                 iov[iov_count++].iov_len = padding;
1339                 rx_size += padding;
1340                 pr_debug("Receiving %u padding bytes.\n", padding);
1341         }
1342
1343         if (conn->conn_ops->DataDigest) {
1344                 iov[iov_count].iov_base = &checksum;
1345                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1346                 rx_size += ISCSI_CRC_LEN;
1347         }
1348
1349         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1350
1351         iscsit_unmap_iovec(cmd);
1352
1353         if (rx_got != rx_size)
1354                 return -1;
1355
1356         if (conn->conn_ops->DataDigest) {
1357                 u32 data_crc;
1358
1359                 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
1360                                                     be32_to_cpu(hdr->offset),
1361                                                     payload_length, padding,
1362                                                     cmd->pad_bytes);
1363
1364                 if (checksum != data_crc) {
1365                         pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1366                                 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1367                                 " does not match computed 0x%08x\n",
1368                                 hdr->itt, hdr->offset, payload_length,
1369                                 hdr->datasn, checksum, data_crc);
1370                         data_crc_failed = 1;
1371                 } else {
1372                         pr_debug("Got CRC32C DataDigest 0x%08x for"
1373                                 " %u bytes of Data Out\n", checksum,
1374                                 payload_length);
1375                 }
1376         }
1377         /*
1378          * Increment post receive data and CRC values or perform
1379          * within-command recovery.
1380          */
1381         ret = iscsit_check_post_dataout(cmd, buf, data_crc_failed);
1382         if ((ret == DATAOUT_NORMAL) || (ret == DATAOUT_WITHIN_COMMAND_RECOVERY))
1383                 return 0;
1384         else if (ret == DATAOUT_SEND_R2T) {
1385                 iscsit_set_dataout_sequence_values(cmd);
1386                 iscsit_build_r2ts_for_cmd(cmd, conn, false);
1387         } else if (ret == DATAOUT_SEND_TO_TRANSPORT) {
1388                 /*
1389                  * Handle extra special case for out of order
1390                  * Unsolicited Data Out.
1391                  */
1392                 spin_lock_bh(&cmd->istate_lock);
1393                 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1394                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1395                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1396                 spin_unlock_bh(&cmd->istate_lock);
1397
1398                 iscsit_stop_dataout_timer(cmd);
1399                 if (ooo_cmdsn)
1400                         return 0;
1401                 target_execute_cmd(&cmd->se_cmd);
1402                 return 0;
1403         } else /* DATAOUT_CANNOT_RECOVER */
1404                 return -1;
1405
1406         return 0;
1407 }
1408
1409 static int iscsit_handle_nop_out(
1410         struct iscsi_conn *conn,
1411         unsigned char *buf)
1412 {
1413         unsigned char *ping_data = NULL;
1414         int cmdsn_ret, niov = 0, ret = 0, rx_got, rx_size;
1415         u32 checksum, data_crc, padding = 0, payload_length;
1416         struct iscsi_cmd *cmd = NULL;
1417         struct kvec *iov = NULL;
1418         struct iscsi_nopout *hdr;
1419
1420         hdr                     = (struct iscsi_nopout *) buf;
1421         payload_length          = ntoh24(hdr->dlength);
1422
1423         if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1424                 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1425                         " not set, protocol error.\n");
1426                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1427                                         buf, conn);
1428         }
1429
1430         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1431                 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1432                         " greater than MaxXmitDataSegmentLength: %u, protocol"
1433                         " error.\n", payload_length,
1434                         conn->conn_ops->MaxXmitDataSegmentLength);
1435                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1436                                         buf, conn);
1437         }
1438
1439         pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%09x,"
1440                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1441                 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1442                 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1443                 payload_length);
1444         /*
1445          * This is not a response to a Unsolicited NopIN, which means
1446          * it can either be a NOPOUT ping request (with a valid ITT),
1447          * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1448          * Either way, make sure we allocate an struct iscsi_cmd, as both
1449          * can contain ping data.
1450          */
1451         if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1452                 cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1453                 if (!cmd)
1454                         return iscsit_add_reject(
1455                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1456                                         1, buf, conn);
1457
1458                 cmd->iscsi_opcode       = ISCSI_OP_NOOP_OUT;
1459                 cmd->i_state            = ISTATE_SEND_NOPIN;
1460                 cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1461                                                 1 : 0);
1462                 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1463                 cmd->targ_xfer_tag      = 0xFFFFFFFF;
1464                 cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1465                 cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1466                 cmd->data_direction     = DMA_NONE;
1467         }
1468
1469         if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1470                 rx_size = payload_length;
1471                 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1472                 if (!ping_data) {
1473                         pr_err("Unable to allocate memory for"
1474                                 " NOPOUT ping data.\n");
1475                         ret = -1;
1476                         goto out;
1477                 }
1478
1479                 iov = &cmd->iov_misc[0];
1480                 iov[niov].iov_base      = ping_data;
1481                 iov[niov++].iov_len     = payload_length;
1482
1483                 padding = ((-payload_length) & 3);
1484                 if (padding != 0) {
1485                         pr_debug("Receiving %u additional bytes"
1486                                 " for padding.\n", padding);
1487                         iov[niov].iov_base      = &cmd->pad_bytes;
1488                         iov[niov++].iov_len     = padding;
1489                         rx_size += padding;
1490                 }
1491                 if (conn->conn_ops->DataDigest) {
1492                         iov[niov].iov_base      = &checksum;
1493                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
1494                         rx_size += ISCSI_CRC_LEN;
1495                 }
1496
1497                 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1498                 if (rx_got != rx_size) {
1499                         ret = -1;
1500                         goto out;
1501                 }
1502
1503                 if (conn->conn_ops->DataDigest) {
1504                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1505                                         ping_data, payload_length,
1506                                         padding, cmd->pad_bytes,
1507                                         (u8 *)&data_crc);
1508
1509                         if (checksum != data_crc) {
1510                                 pr_err("Ping data CRC32C DataDigest"
1511                                 " 0x%08x does not match computed 0x%08x\n",
1512                                         checksum, data_crc);
1513                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1514                                         pr_err("Unable to recover from"
1515                                         " NOPOUT Ping DataCRC failure while in"
1516                                                 " ERL=0.\n");
1517                                         ret = -1;
1518                                         goto out;
1519                                 } else {
1520                                         /*
1521                                          * Silently drop this PDU and let the
1522                                          * initiator plug the CmdSN gap.
1523                                          */
1524                                         pr_debug("Dropping NOPOUT"
1525                                         " Command CmdSN: 0x%08x due to"
1526                                         " DataCRC error.\n", hdr->cmdsn);
1527                                         ret = 0;
1528                                         goto out;
1529                                 }
1530                         } else {
1531                                 pr_debug("Got CRC32C DataDigest"
1532                                 " 0x%08x for %u bytes of ping data.\n",
1533                                         checksum, payload_length);
1534                         }
1535                 }
1536
1537                 ping_data[payload_length] = '\0';
1538                 /*
1539                  * Attach ping data to struct iscsi_cmd->buf_ptr.
1540                  */
1541                 cmd->buf_ptr = ping_data;
1542                 cmd->buf_ptr_size = payload_length;
1543
1544                 pr_debug("Got %u bytes of NOPOUT ping"
1545                         " data.\n", payload_length);
1546                 pr_debug("Ping Data: \"%s\"\n", ping_data);
1547         }
1548
1549         if (hdr->itt != RESERVED_ITT) {
1550                 if (!cmd) {
1551                         pr_err("Checking CmdSN for NOPOUT,"
1552                                 " but cmd is NULL!\n");
1553                         return -1;
1554                 }
1555                 /*
1556                  * Initiator is expecting a NopIN ping reply,
1557                  */
1558                 spin_lock_bh(&conn->cmd_lock);
1559                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1560                 spin_unlock_bh(&conn->cmd_lock);
1561
1562                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1563
1564                 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1565                         iscsit_add_cmd_to_response_queue(cmd, conn,
1566                                         cmd->i_state);
1567                         return 0;
1568                 }
1569
1570                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1571                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1572                         ret = 0;
1573                         goto ping_out;
1574                 }
1575                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1576                         return iscsit_add_reject_from_cmd(
1577                                         ISCSI_REASON_PROTOCOL_ERROR,
1578                                         1, 0, buf, cmd);
1579
1580                 return 0;
1581         }
1582
1583         if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1584                 /*
1585                  * This was a response to a unsolicited NOPIN ping.
1586                  */
1587                 cmd = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1588                 if (!cmd)
1589                         return -1;
1590
1591                 iscsit_stop_nopin_response_timer(conn);
1592
1593                 cmd->i_state = ISTATE_REMOVE;
1594                 iscsit_add_cmd_to_immediate_queue(cmd, conn, cmd->i_state);
1595                 iscsit_start_nopin_timer(conn);
1596         } else {
1597                 /*
1598                  * Initiator is not expecting a NOPIN is response.
1599                  * Just ignore for now.
1600                  *
1601                  * iSCSI v19-91 10.18
1602                  * "A NOP-OUT may also be used to confirm a changed
1603                  *  ExpStatSN if another PDU will not be available
1604                  *  for a long time."
1605                  */
1606                 ret = 0;
1607                 goto out;
1608         }
1609
1610         return 0;
1611 out:
1612         if (cmd)
1613                 iscsit_release_cmd(cmd);
1614 ping_out:
1615         kfree(ping_data);
1616         return ret;
1617 }
1618
1619 static int iscsit_handle_task_mgt_cmd(
1620         struct iscsi_conn *conn,
1621         unsigned char *buf)
1622 {
1623         struct iscsi_cmd *cmd;
1624         struct se_tmr_req *se_tmr;
1625         struct iscsi_tmr_req *tmr_req;
1626         struct iscsi_tm *hdr;
1627         int out_of_order_cmdsn = 0;
1628         int ret;
1629         u8 function;
1630
1631         hdr                     = (struct iscsi_tm *) buf;
1632         hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1633         function = hdr->flags;
1634
1635         pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1636                 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1637                 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1638                 hdr->rtt, hdr->refcmdsn, conn->cid);
1639
1640         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1641             ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1642              hdr->rtt != RESERVED_ITT)) {
1643                 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1644                 hdr->rtt = RESERVED_ITT;
1645         }
1646
1647         if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1648                         !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1649                 pr_err("Task Management Request TASK_REASSIGN not"
1650                         " issued as immediate command, bad iSCSI Initiator"
1651                                 "implementation\n");
1652                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1653                                         buf, conn);
1654         }
1655         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1656             be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1657                 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1658
1659         cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1660         if (!cmd)
1661                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1662                                          1, buf, conn);
1663
1664         cmd->data_direction = DMA_NONE;
1665
1666         cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1667         if (!cmd->tmr_req) {
1668                 pr_err("Unable to allocate memory for"
1669                         " Task Management command!\n");
1670                 return iscsit_add_reject_from_cmd(
1671                         ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1672                         1, 1, buf, cmd);
1673         }
1674
1675         /*
1676          * TASK_REASSIGN for ERL=2 / connection stays inside of
1677          * LIO-Target $FABRIC_MOD
1678          */
1679         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1680
1681                 u8 tcm_function;
1682                 int ret;
1683
1684                 transport_init_se_cmd(&cmd->se_cmd,
1685                                       &lio_target_fabric_configfs->tf_ops,
1686                                       conn->sess->se_sess, 0, DMA_NONE,
1687                                       MSG_SIMPLE_TAG, cmd->sense_buffer + 2);
1688
1689                 switch (function) {
1690                 case ISCSI_TM_FUNC_ABORT_TASK:
1691                         tcm_function = TMR_ABORT_TASK;
1692                         break;
1693                 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1694                         tcm_function = TMR_ABORT_TASK_SET;
1695                         break;
1696                 case ISCSI_TM_FUNC_CLEAR_ACA:
1697                         tcm_function = TMR_CLEAR_ACA;
1698                         break;
1699                 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1700                         tcm_function = TMR_CLEAR_TASK_SET;
1701                         break;
1702                 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1703                         tcm_function = TMR_LUN_RESET;
1704                         break;
1705                 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1706                         tcm_function = TMR_TARGET_WARM_RESET;
1707                         break;
1708                 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1709                         tcm_function = TMR_TARGET_COLD_RESET;
1710                         break;
1711                 default:
1712                         pr_err("Unknown iSCSI TMR Function:"
1713                                " 0x%02x\n", function);
1714                         return iscsit_add_reject_from_cmd(
1715                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1716                                 1, 1, buf, cmd);
1717                 }
1718
1719                 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req,
1720                                          tcm_function, GFP_KERNEL);
1721                 if (ret < 0)
1722                         return iscsit_add_reject_from_cmd(
1723                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1724                                 1, 1, buf, cmd);
1725
1726                 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
1727         }
1728
1729         cmd->iscsi_opcode       = ISCSI_OP_SCSI_TMFUNC;
1730         cmd->i_state            = ISTATE_SEND_TASKMGTRSP;
1731         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1732         cmd->init_task_tag      = hdr->itt;
1733         cmd->targ_xfer_tag      = 0xFFFFFFFF;
1734         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1735         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1736         se_tmr                  = cmd->se_cmd.se_tmr_req;
1737         tmr_req                 = cmd->tmr_req;
1738         /*
1739          * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1740          */
1741         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1742                 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
1743                                                scsilun_to_int(&hdr->lun));
1744                 if (ret < 0) {
1745                         cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1746                         se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1747                         goto attach;
1748                 }
1749         }
1750
1751         switch (function) {
1752         case ISCSI_TM_FUNC_ABORT_TASK:
1753                 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
1754                 if (se_tmr->response != ISCSI_TMF_RSP_COMPLETE) {
1755                         cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1756                         goto attach;
1757                 }
1758                 break;
1759         case ISCSI_TM_FUNC_ABORT_TASK_SET:
1760         case ISCSI_TM_FUNC_CLEAR_ACA:
1761         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1762         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1763                 break;
1764         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1765                 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
1766                         cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1767                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1768                         goto attach;
1769                 }
1770                 break;
1771         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1772                 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
1773                         cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1774                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1775                         goto attach;
1776                 }
1777                 break;
1778         case ISCSI_TM_FUNC_TASK_REASSIGN:
1779                 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1780                 /*
1781                  * Perform sanity checks on the ExpDataSN only if the
1782                  * TASK_REASSIGN was successful.
1783                  */
1784                 if (se_tmr->response != ISCSI_TMF_RSP_COMPLETE)
1785                         break;
1786
1787                 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1788                         return iscsit_add_reject_from_cmd(
1789                                         ISCSI_REASON_BOOKMARK_INVALID, 1, 1,
1790                                         buf, cmd);
1791                 break;
1792         default:
1793                 pr_err("Unknown TMR function: 0x%02x, protocol"
1794                         " error.\n", function);
1795                 cmd->se_cmd.se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION;
1796                 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1797                 goto attach;
1798         }
1799
1800         if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1801             (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1802                 se_tmr->call_transport = 1;
1803 attach:
1804         spin_lock_bh(&conn->cmd_lock);
1805         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1806         spin_unlock_bh(&conn->cmd_lock);
1807
1808         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1809                 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1810                 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1811                         out_of_order_cmdsn = 1;
1812                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1813                         return 0;
1814                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1815                         return iscsit_add_reject_from_cmd(
1816                                         ISCSI_REASON_PROTOCOL_ERROR,
1817                                         1, 0, buf, cmd);
1818         }
1819         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1820
1821         if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
1822                 return 0;
1823         /*
1824          * Found the referenced task, send to transport for processing.
1825          */
1826         if (se_tmr->call_transport)
1827                 return transport_generic_handle_tmr(&cmd->se_cmd);
1828
1829         /*
1830          * Could not find the referenced LUN, task, or Task Management
1831          * command not authorized or supported.  Change state and
1832          * let the tx_thread send the response.
1833          *
1834          * For connection recovery, this is also the default action for
1835          * TMR TASK_REASSIGN.
1836          */
1837         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1838         return 0;
1839 }
1840
1841 /* #warning FIXME: Support Text Command parameters besides SendTargets */
1842 static int iscsit_handle_text_cmd(
1843         struct iscsi_conn *conn,
1844         unsigned char *buf)
1845 {
1846         char *text_ptr, *text_in;
1847         int cmdsn_ret, niov = 0, rx_got, rx_size;
1848         u32 checksum = 0, data_crc = 0, payload_length;
1849         u32 padding = 0, pad_bytes = 0, text_length = 0;
1850         struct iscsi_cmd *cmd;
1851         struct kvec iov[3];
1852         struct iscsi_text *hdr;
1853
1854         hdr                     = (struct iscsi_text *) buf;
1855         payload_length          = ntoh24(hdr->dlength);
1856
1857         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1858                 pr_err("Unable to accept text parameter length: %u"
1859                         "greater than MaxXmitDataSegmentLength %u.\n",
1860                        payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1861                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
1862                                         buf, conn);
1863         }
1864
1865         pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1866                 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1867                 hdr->exp_statsn, payload_length);
1868
1869         rx_size = text_length = payload_length;
1870         if (text_length) {
1871                 text_in = kzalloc(text_length, GFP_KERNEL);
1872                 if (!text_in) {
1873                         pr_err("Unable to allocate memory for"
1874                                 " incoming text parameters\n");
1875                         return -1;
1876                 }
1877
1878                 memset(iov, 0, 3 * sizeof(struct kvec));
1879                 iov[niov].iov_base      = text_in;
1880                 iov[niov++].iov_len     = text_length;
1881
1882                 padding = ((-payload_length) & 3);
1883                 if (padding != 0) {
1884                         iov[niov].iov_base = &pad_bytes;
1885                         iov[niov++].iov_len  = padding;
1886                         rx_size += padding;
1887                         pr_debug("Receiving %u additional bytes"
1888                                         " for padding.\n", padding);
1889                 }
1890                 if (conn->conn_ops->DataDigest) {
1891                         iov[niov].iov_base      = &checksum;
1892                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
1893                         rx_size += ISCSI_CRC_LEN;
1894                 }
1895
1896                 rx_got = rx_data(conn, &iov[0], niov, rx_size);
1897                 if (rx_got != rx_size) {
1898                         kfree(text_in);
1899                         return -1;
1900                 }
1901
1902                 if (conn->conn_ops->DataDigest) {
1903                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1904                                         text_in, text_length,
1905                                         padding, (u8 *)&pad_bytes,
1906                                         (u8 *)&data_crc);
1907
1908                         if (checksum != data_crc) {
1909                                 pr_err("Text data CRC32C DataDigest"
1910                                         " 0x%08x does not match computed"
1911                                         " 0x%08x\n", checksum, data_crc);
1912                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1913                                         pr_err("Unable to recover from"
1914                                         " Text Data digest failure while in"
1915                                                 " ERL=0.\n");
1916                                         kfree(text_in);
1917                                         return -1;
1918                                 } else {
1919                                         /*
1920                                          * Silently drop this PDU and let the
1921                                          * initiator plug the CmdSN gap.
1922                                          */
1923                                         pr_debug("Dropping Text"
1924                                         " Command CmdSN: 0x%08x due to"
1925                                         " DataCRC error.\n", hdr->cmdsn);
1926                                         kfree(text_in);
1927                                         return 0;
1928                                 }
1929                         } else {
1930                                 pr_debug("Got CRC32C DataDigest"
1931                                         " 0x%08x for %u bytes of text data.\n",
1932                                                 checksum, text_length);
1933                         }
1934                 }
1935                 text_in[text_length - 1] = '\0';
1936                 pr_debug("Successfully read %d bytes of text"
1937                                 " data.\n", text_length);
1938
1939                 if (strncmp("SendTargets", text_in, 11) != 0) {
1940                         pr_err("Received Text Data that is not"
1941                                 " SendTargets, cannot continue.\n");
1942                         kfree(text_in);
1943                         return -1;
1944                 }
1945                 text_ptr = strchr(text_in, '=');
1946                 if (!text_ptr) {
1947                         pr_err("No \"=\" separator found in Text Data,"
1948                                 "  cannot continue.\n");
1949                         kfree(text_in);
1950                         return -1;
1951                 }
1952                 if (strncmp("=All", text_ptr, 4) != 0) {
1953                         pr_err("Unable to locate All value for"
1954                                 " SendTargets key,  cannot continue.\n");
1955                         kfree(text_in);
1956                         return -1;
1957                 }
1958 /*#warning Support SendTargets=(iSCSI Target Name/Nothing) values. */
1959                 kfree(text_in);
1960         }
1961
1962         cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
1963         if (!cmd)
1964                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1965                                         1, buf, conn);
1966
1967         cmd->iscsi_opcode       = ISCSI_OP_TEXT;
1968         cmd->i_state            = ISTATE_SEND_TEXTRSP;
1969         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1970         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
1971         cmd->targ_xfer_tag      = 0xFFFFFFFF;
1972         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1973         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1974         cmd->data_direction     = DMA_NONE;
1975
1976         spin_lock_bh(&conn->cmd_lock);
1977         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1978         spin_unlock_bh(&conn->cmd_lock);
1979
1980         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1981
1982         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1983                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
1984                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1985                         return iscsit_add_reject_from_cmd(
1986                                         ISCSI_REASON_PROTOCOL_ERROR,
1987                                         1, 0, buf, cmd);
1988
1989                 return 0;
1990         }
1991
1992         return iscsit_execute_cmd(cmd, 0);
1993 }
1994
1995 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
1996 {
1997         struct iscsi_conn *conn_p;
1998         struct iscsi_session *sess = conn->sess;
1999
2000         pr_debug("Received logout request CLOSESESSION on CID: %hu"
2001                 " for SID: %u.\n", conn->cid, conn->sess->sid);
2002
2003         atomic_set(&sess->session_logout, 1);
2004         atomic_set(&conn->conn_logout_remove, 1);
2005         conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2006
2007         iscsit_inc_conn_usage_count(conn);
2008         iscsit_inc_session_usage_count(sess);
2009
2010         spin_lock_bh(&sess->conn_lock);
2011         list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2012                 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2013                         continue;
2014
2015                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2016                 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2017         }
2018         spin_unlock_bh(&sess->conn_lock);
2019
2020         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2021
2022         return 0;
2023 }
2024
2025 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2026 {
2027         struct iscsi_conn *l_conn;
2028         struct iscsi_session *sess = conn->sess;
2029
2030         pr_debug("Received logout request CLOSECONNECTION for CID:"
2031                 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2032
2033         /*
2034          * A Logout Request with a CLOSECONNECTION reason code for a CID
2035          * can arrive on a connection with a differing CID.
2036          */
2037         if (conn->cid == cmd->logout_cid) {
2038                 spin_lock_bh(&conn->state_lock);
2039                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2040                 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2041
2042                 atomic_set(&conn->conn_logout_remove, 1);
2043                 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2044                 iscsit_inc_conn_usage_count(conn);
2045
2046                 spin_unlock_bh(&conn->state_lock);
2047         } else {
2048                 /*
2049                  * Handle all different cid CLOSECONNECTION requests in
2050                  * iscsit_logout_post_handler_diffcid() as to give enough
2051                  * time for any non immediate command's CmdSN to be
2052                  * acknowledged on the connection in question.
2053                  *
2054                  * Here we simply make sure the CID is still around.
2055                  */
2056                 l_conn = iscsit_get_conn_from_cid(sess,
2057                                 cmd->logout_cid);
2058                 if (!l_conn) {
2059                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2060                         iscsit_add_cmd_to_response_queue(cmd, conn,
2061                                         cmd->i_state);
2062                         return 0;
2063                 }
2064
2065                 iscsit_dec_conn_usage_count(l_conn);
2066         }
2067
2068         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2069
2070         return 0;
2071 }
2072
2073 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2074 {
2075         struct iscsi_session *sess = conn->sess;
2076
2077         pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2078                 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2079
2080         if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2081                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2082                         " while ERL!=2.\n");
2083                 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2084                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2085                 return 0;
2086         }
2087
2088         if (conn->cid == cmd->logout_cid) {
2089                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2090                         " with CID: %hu on CID: %hu, implementation error.\n",
2091                                 cmd->logout_cid, conn->cid);
2092                 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2093                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2094                 return 0;
2095         }
2096
2097         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2098
2099         return 0;
2100 }
2101
2102 static int iscsit_handle_logout_cmd(
2103         struct iscsi_conn *conn,
2104         unsigned char *buf)
2105 {
2106         int cmdsn_ret, logout_remove = 0;
2107         u8 reason_code = 0;
2108         struct iscsi_cmd *cmd;
2109         struct iscsi_logout *hdr;
2110         struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2111
2112         hdr                     = (struct iscsi_logout *) buf;
2113         reason_code             = (hdr->flags & 0x7f);
2114
2115         if (tiqn) {
2116                 spin_lock(&tiqn->logout_stats.lock);
2117                 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2118                         tiqn->logout_stats.normal_logouts++;
2119                 else
2120                         tiqn->logout_stats.abnormal_logouts++;
2121                 spin_unlock(&tiqn->logout_stats.lock);
2122         }
2123
2124         pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2125                 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2126                 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2127                 hdr->cid, conn->cid);
2128
2129         if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2130                 pr_err("Received logout request on connection that"
2131                         " is not in logged in state, ignoring request.\n");
2132                 return 0;
2133         }
2134
2135         cmd = iscsit_allocate_cmd(conn, GFP_KERNEL);
2136         if (!cmd)
2137                 return iscsit_add_reject(ISCSI_REASON_BOOKMARK_NO_RESOURCES, 1,
2138                                         buf, conn);
2139
2140         cmd->iscsi_opcode       = ISCSI_OP_LOGOUT;
2141         cmd->i_state            = ISTATE_SEND_LOGOUTRSP;
2142         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2143         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2144         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2145         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2146         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2147         cmd->logout_cid         = be16_to_cpu(hdr->cid);
2148         cmd->logout_reason      = reason_code;
2149         cmd->data_direction     = DMA_NONE;
2150
2151         /*
2152          * We need to sleep in these cases (by returning 1) until the Logout
2153          * Response gets sent in the tx thread.
2154          */
2155         if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2156            ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2157             be16_to_cpu(hdr->cid) == conn->cid))
2158                 logout_remove = 1;
2159
2160         spin_lock_bh(&conn->cmd_lock);
2161         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2162         spin_unlock_bh(&conn->cmd_lock);
2163
2164         if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2165                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2166
2167         /*
2168          * Immediate commands are executed, well, immediately.
2169          * Non-Immediate Logout Commands are executed in CmdSN order.
2170          */
2171         if (cmd->immediate_cmd) {
2172                 int ret = iscsit_execute_cmd(cmd, 0);
2173
2174                 if (ret < 0)
2175                         return ret;
2176         } else {
2177                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, hdr->cmdsn);
2178                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2179                         logout_remove = 0;
2180                 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2181                         return iscsit_add_reject_from_cmd(
2182                                 ISCSI_REASON_PROTOCOL_ERROR,
2183                                 1, 0, buf, cmd);
2184                 }
2185         }
2186
2187         return logout_remove;
2188 }
2189
2190 static int iscsit_handle_snack(
2191         struct iscsi_conn *conn,
2192         unsigned char *buf)
2193 {
2194         struct iscsi_snack *hdr;
2195
2196         hdr                     = (struct iscsi_snack *) buf;
2197         hdr->flags              &= ~ISCSI_FLAG_CMD_FINAL;
2198
2199         pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2200                 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2201                 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2202                         hdr->begrun, hdr->runlength, conn->cid);
2203
2204         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2205                 pr_err("Initiator sent SNACK request while in"
2206                         " ErrorRecoveryLevel=0.\n");
2207                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2208                                         buf, conn);
2209         }
2210         /*
2211          * SNACK_DATA and SNACK_R2T are both 0,  so check which function to
2212          * call from inside iscsi_send_recovery_datain_or_r2t().
2213          */
2214         switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2215         case 0:
2216                 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2217                         hdr->itt,
2218                         be32_to_cpu(hdr->ttt),
2219                         be32_to_cpu(hdr->begrun),
2220                         be32_to_cpu(hdr->runlength));
2221         case ISCSI_FLAG_SNACK_TYPE_STATUS:
2222                 return iscsit_handle_status_snack(conn, hdr->itt,
2223                         be32_to_cpu(hdr->ttt),
2224                         be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2225         case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2226                 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2227                         be32_to_cpu(hdr->begrun),
2228                         be32_to_cpu(hdr->runlength));
2229         case ISCSI_FLAG_SNACK_TYPE_RDATA:
2230                 /* FIXME: Support R-Data SNACK */
2231                 pr_err("R-Data SNACK Not Supported.\n");
2232                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2233                                         buf, conn);
2234         default:
2235                 pr_err("Unknown SNACK type 0x%02x, protocol"
2236                         " error.\n", hdr->flags & 0x0f);
2237                 return iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
2238                                         buf, conn);
2239         }
2240
2241         return 0;
2242 }
2243
2244 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2245 {
2246         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2247             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2248                 wait_for_completion_interruptible_timeout(
2249                                         &conn->rx_half_close_comp,
2250                                         ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2251         }
2252 }
2253
2254 static int iscsit_handle_immediate_data(
2255         struct iscsi_cmd *cmd,
2256         unsigned char *buf,
2257         u32 length)
2258 {
2259         int iov_ret, rx_got = 0, rx_size = 0;
2260         u32 checksum, iov_count = 0, padding = 0;
2261         struct iscsi_conn *conn = cmd->conn;
2262         struct kvec *iov;
2263
2264         iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2265         if (iov_ret < 0)
2266                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2267
2268         rx_size = length;
2269         iov_count = iov_ret;
2270         iov = &cmd->iov_data[0];
2271
2272         padding = ((-length) & 3);
2273         if (padding != 0) {
2274                 iov[iov_count].iov_base = cmd->pad_bytes;
2275                 iov[iov_count++].iov_len = padding;
2276                 rx_size += padding;
2277         }
2278
2279         if (conn->conn_ops->DataDigest) {
2280                 iov[iov_count].iov_base         = &checksum;
2281                 iov[iov_count++].iov_len        = ISCSI_CRC_LEN;
2282                 rx_size += ISCSI_CRC_LEN;
2283         }
2284
2285         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2286
2287         iscsit_unmap_iovec(cmd);
2288
2289         if (rx_got != rx_size) {
2290                 iscsit_rx_thread_wait_for_tcp(conn);
2291                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2292         }
2293
2294         if (conn->conn_ops->DataDigest) {
2295                 u32 data_crc;
2296
2297                 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2298                                                     cmd->write_data_done, length, padding,
2299                                                     cmd->pad_bytes);
2300
2301                 if (checksum != data_crc) {
2302                         pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2303                                 " does not match computed 0x%08x\n", checksum,
2304                                 data_crc);
2305
2306                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2307                                 pr_err("Unable to recover from"
2308                                         " Immediate Data digest failure while"
2309                                         " in ERL=0.\n");
2310                                 iscsit_add_reject_from_cmd(
2311                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2312                                                 1, 0, buf, cmd);
2313                                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2314                         } else {
2315                                 iscsit_add_reject_from_cmd(
2316                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2317                                                 0, 0, buf, cmd);
2318                                 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2319                         }
2320                 } else {
2321                         pr_debug("Got CRC32C DataDigest 0x%08x for"
2322                                 " %u bytes of Immediate Data\n", checksum,
2323                                 length);
2324                 }
2325         }
2326
2327         cmd->write_data_done += length;
2328
2329         if (cmd->write_data_done == cmd->se_cmd.data_length) {
2330                 spin_lock_bh(&cmd->istate_lock);
2331                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2332                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2333                 spin_unlock_bh(&cmd->istate_lock);
2334         }
2335
2336         return IMMEDIATE_DATA_NORMAL_OPERATION;
2337 }
2338
2339 /*
2340  *      Called with sess->conn_lock held.
2341  */
2342 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2343         with active network interface */
2344 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2345 {
2346         struct iscsi_cmd *cmd;
2347         struct iscsi_conn *conn_p;
2348
2349         /*
2350          * Only send a Asynchronous Message on connections whos network
2351          * interface is still functional.
2352          */
2353         list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2354                 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2355                         iscsit_inc_conn_usage_count(conn_p);
2356                         break;
2357                 }
2358         }
2359
2360         if (!conn_p)
2361                 return;
2362
2363         cmd = iscsit_allocate_cmd(conn_p, GFP_KERNEL);
2364         if (!cmd) {
2365                 iscsit_dec_conn_usage_count(conn_p);
2366                 return;
2367         }
2368
2369         cmd->logout_cid = conn->cid;
2370         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2371         cmd->i_state = ISTATE_SEND_ASYNCMSG;
2372
2373         spin_lock_bh(&conn_p->cmd_lock);
2374         list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2375         spin_unlock_bh(&conn_p->cmd_lock);
2376
2377         iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2378         iscsit_dec_conn_usage_count(conn_p);
2379 }
2380
2381 static int iscsit_send_conn_drop_async_message(
2382         struct iscsi_cmd *cmd,
2383         struct iscsi_conn *conn)
2384 {
2385         struct iscsi_async *hdr;
2386
2387         cmd->tx_size = ISCSI_HDR_LEN;
2388         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2389
2390         hdr                     = (struct iscsi_async *) cmd->pdu;
2391         hdr->opcode             = ISCSI_OP_ASYNC_EVENT;
2392         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
2393         cmd->init_task_tag      = RESERVED_ITT;
2394         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2395         put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2396         cmd->stat_sn            = conn->stat_sn++;
2397         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2398         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2399         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2400         hdr->async_event        = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2401         hdr->param1             = cpu_to_be16(cmd->logout_cid);
2402         hdr->param2             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2403         hdr->param3             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2404
2405         if (conn->conn_ops->HeaderDigest) {
2406                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2407
2408                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2409                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2410                                 0, NULL, (u8 *)header_digest);
2411
2412                 cmd->tx_size += ISCSI_CRC_LEN;
2413                 pr_debug("Attaching CRC32C HeaderDigest to"
2414                         " Async Message 0x%08x\n", *header_digest);
2415         }
2416
2417         cmd->iov_misc[0].iov_base       = cmd->pdu;
2418         cmd->iov_misc[0].iov_len        = cmd->tx_size;
2419         cmd->iov_misc_count             = 1;
2420
2421         pr_debug("Sending Connection Dropped Async Message StatSN:"
2422                 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2423                         cmd->logout_cid, conn->cid);
2424         return 0;
2425 }
2426
2427 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2428 {
2429         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2430             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2431                 wait_for_completion_interruptible_timeout(
2432                                         &conn->tx_half_close_comp,
2433                                         ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2434         }
2435 }
2436
2437 static int iscsit_send_data_in(
2438         struct iscsi_cmd *cmd,
2439         struct iscsi_conn *conn)
2440 {
2441         int iov_ret = 0, set_statsn = 0;
2442         u32 iov_count = 0, tx_size = 0;
2443         struct iscsi_datain datain;
2444         struct iscsi_datain_req *dr;
2445         struct iscsi_data_rsp *hdr;
2446         struct kvec *iov;
2447         int eodr = 0;
2448         int ret;
2449
2450         memset(&datain, 0, sizeof(struct iscsi_datain));
2451         dr = iscsit_get_datain_values(cmd, &datain);
2452         if (!dr) {
2453                 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2454                                 cmd->init_task_tag);
2455                 return -1;
2456         }
2457
2458         /*
2459          * Be paranoid and double check the logic for now.
2460          */
2461         if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2462                 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2463                         " datain.length: %u exceeds cmd->data_length: %u\n",
2464                         cmd->init_task_tag, datain.offset, datain.length,
2465                                 cmd->se_cmd.data_length);
2466                 return -1;
2467         }
2468
2469         spin_lock_bh(&conn->sess->session_stats_lock);
2470         conn->sess->tx_data_octets += datain.length;
2471         if (conn->sess->se_sess->se_node_acl) {
2472                 spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock);
2473                 conn->sess->se_sess->se_node_acl->read_bytes += datain.length;
2474                 spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock);
2475         }
2476         spin_unlock_bh(&conn->sess->session_stats_lock);
2477         /*
2478          * Special case for successfully execution w/ both DATAIN
2479          * and Sense Data.
2480          */
2481         if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2482             (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2483                 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2484         else {
2485                 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2486                     (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2487                         iscsit_increment_maxcmdsn(cmd, conn->sess);
2488                         cmd->stat_sn = conn->stat_sn++;
2489                         set_statsn = 1;
2490                 } else if (dr->dr_complete ==
2491                                 DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2492                         set_statsn = 1;
2493         }
2494
2495         hdr     = (struct iscsi_data_rsp *) cmd->pdu;
2496         memset(hdr, 0, ISCSI_HDR_LEN);
2497         hdr->opcode             = ISCSI_OP_SCSI_DATA_IN;
2498         hdr->flags              = datain.flags;
2499         if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2500                 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2501                         hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2502                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2503                 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2504                         hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2505                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2506                 }
2507         }
2508         hton24(hdr->dlength, datain.length);
2509         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2510                 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2511                                 (struct scsi_lun *)&hdr->lun);
2512         else
2513                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2514
2515         hdr->itt                = cmd->init_task_tag;
2516
2517         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2518                 hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2519         else
2520                 hdr->ttt                = cpu_to_be32(0xFFFFFFFF);
2521         if (set_statsn)
2522                 hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2523         else
2524                 hdr->statsn             = cpu_to_be32(0xFFFFFFFF);
2525
2526         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2527         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2528         hdr->datasn             = cpu_to_be32(datain.data_sn);
2529         hdr->offset             = cpu_to_be32(datain.offset);
2530
2531         iov = &cmd->iov_data[0];
2532         iov[iov_count].iov_base = cmd->pdu;
2533         iov[iov_count++].iov_len        = ISCSI_HDR_LEN;
2534         tx_size += ISCSI_HDR_LEN;
2535
2536         if (conn->conn_ops->HeaderDigest) {
2537                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2538
2539                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2540                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2541                                 0, NULL, (u8 *)header_digest);
2542
2543                 iov[0].iov_len += ISCSI_CRC_LEN;
2544                 tx_size += ISCSI_CRC_LEN;
2545
2546                 pr_debug("Attaching CRC32 HeaderDigest"
2547                         " for DataIN PDU 0x%08x\n", *header_digest);
2548         }
2549
2550         iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1], datain.offset, datain.length);
2551         if (iov_ret < 0)
2552                 return -1;
2553
2554         iov_count += iov_ret;
2555         tx_size += datain.length;
2556
2557         cmd->padding = ((-datain.length) & 3);
2558         if (cmd->padding) {
2559                 iov[iov_count].iov_base         = cmd->pad_bytes;
2560                 iov[iov_count++].iov_len        = cmd->padding;
2561                 tx_size += cmd->padding;
2562
2563                 pr_debug("Attaching %u padding bytes\n",
2564                                 cmd->padding);
2565         }
2566         if (conn->conn_ops->DataDigest) {
2567                 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2568                          datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2569
2570                 iov[iov_count].iov_base = &cmd->data_crc;
2571                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2572                 tx_size += ISCSI_CRC_LEN;
2573
2574                 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2575                         " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2576         }
2577
2578         cmd->iov_data_count = iov_count;
2579         cmd->tx_size = tx_size;
2580
2581         pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2582                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2583                 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2584                 ntohl(hdr->offset), datain.length, conn->cid);
2585
2586         /* sendpage is preferred but can't insert markers */
2587         if (!conn->conn_ops->IFMarker)
2588                 ret = iscsit_fe_sendpage_sg(cmd, conn);
2589         else
2590                 ret = iscsit_send_tx_data(cmd, conn, 0);
2591
2592         iscsit_unmap_iovec(cmd);
2593
2594         if (ret < 0) {
2595                 iscsit_tx_thread_wait_for_tcp(conn);
2596                 return ret;
2597         }
2598
2599         if (dr->dr_complete) {
2600                 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2601                                 2 : 1;
2602                 iscsit_free_datain_req(cmd, dr);
2603         }
2604
2605         return eodr;
2606 }
2607
2608 static int iscsit_send_logout_response(
2609         struct iscsi_cmd *cmd,
2610         struct iscsi_conn *conn)
2611 {
2612         int niov = 0, tx_size;
2613         struct iscsi_conn *logout_conn = NULL;
2614         struct iscsi_conn_recovery *cr = NULL;
2615         struct iscsi_session *sess = conn->sess;
2616         struct kvec *iov;
2617         struct iscsi_logout_rsp *hdr;
2618         /*
2619          * The actual shutting down of Sessions and/or Connections
2620          * for CLOSESESSION and CLOSECONNECTION Logout Requests
2621          * is done in scsi_logout_post_handler().
2622          */
2623         switch (cmd->logout_reason) {
2624         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2625                 pr_debug("iSCSI session logout successful, setting"
2626                         " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2627                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2628                 break;
2629         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2630                 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2631                         break;
2632                 /*
2633                  * For CLOSECONNECTION logout requests carrying
2634                  * a matching logout CID -> local CID, the reference
2635                  * for the local CID will have been incremented in
2636                  * iscsi_logout_closeconnection().
2637                  *
2638                  * For CLOSECONNECTION logout requests carrying
2639                  * a different CID than the connection it arrived
2640                  * on, the connection responding to cmd->logout_cid
2641                  * is stopped in iscsit_logout_post_handler_diffcid().
2642                  */
2643
2644                 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2645                         " successful.\n", cmd->logout_cid, conn->cid);
2646                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2647                 break;
2648         case ISCSI_LOGOUT_REASON_RECOVERY:
2649                 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2650                     (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2651                         break;
2652                 /*
2653                  * If the connection is still active from our point of view
2654                  * force connection recovery to occur.
2655                  */
2656                 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2657                                 cmd->logout_cid);
2658                 if (logout_conn) {
2659                         iscsit_connection_reinstatement_rcfr(logout_conn);
2660                         iscsit_dec_conn_usage_count(logout_conn);
2661                 }
2662
2663                 cr = iscsit_get_inactive_connection_recovery_entry(
2664                                 conn->sess, cmd->logout_cid);
2665                 if (!cr) {
2666                         pr_err("Unable to locate CID: %hu for"
2667                         " REMOVECONNFORRECOVERY Logout Request.\n",
2668                                 cmd->logout_cid);
2669                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2670                         break;
2671                 }
2672
2673                 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2674
2675                 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2676                         " for recovery for CID: %hu on CID: %hu successful.\n",
2677                                 cmd->logout_cid, conn->cid);
2678                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2679                 break;
2680         default:
2681                 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2682                                 cmd->logout_reason);
2683                 return -1;
2684         }
2685
2686         tx_size = ISCSI_HDR_LEN;
2687         hdr                     = (struct iscsi_logout_rsp *)cmd->pdu;
2688         memset(hdr, 0, ISCSI_HDR_LEN);
2689         hdr->opcode             = ISCSI_OP_LOGOUT_RSP;
2690         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2691         hdr->response           = cmd->logout_response;
2692         hdr->itt                = cmd->init_task_tag;
2693         cmd->stat_sn            = conn->stat_sn++;
2694         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2695
2696         iscsit_increment_maxcmdsn(cmd, conn->sess);
2697         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2698         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2699
2700         iov = &cmd->iov_misc[0];
2701         iov[niov].iov_base      = cmd->pdu;
2702         iov[niov++].iov_len     = ISCSI_HDR_LEN;
2703
2704         if (conn->conn_ops->HeaderDigest) {
2705                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2706
2707                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2708                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2709                                 0, NULL, (u8 *)header_digest);
2710
2711                 iov[0].iov_len += ISCSI_CRC_LEN;
2712                 tx_size += ISCSI_CRC_LEN;
2713                 pr_debug("Attaching CRC32C HeaderDigest to"
2714                         " Logout Response 0x%08x\n", *header_digest);
2715         }
2716         cmd->iov_misc_count = niov;
2717         cmd->tx_size = tx_size;
2718
2719         pr_debug("Sending Logout Response ITT: 0x%08x StatSN:"
2720                 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2721                 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2722                 cmd->logout_cid, conn->cid);
2723
2724         return 0;
2725 }
2726
2727 /*
2728  *      Unsolicited NOPIN, either requesting a response or not.
2729  */
2730 static int iscsit_send_unsolicited_nopin(
2731         struct iscsi_cmd *cmd,
2732         struct iscsi_conn *conn,
2733         int want_response)
2734 {
2735         int tx_size = ISCSI_HDR_LEN;
2736         struct iscsi_nopin *hdr;
2737         int ret;
2738
2739         hdr                     = (struct iscsi_nopin *) cmd->pdu;
2740         memset(hdr, 0, ISCSI_HDR_LEN);
2741         hdr->opcode             = ISCSI_OP_NOOP_IN;
2742         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2743         hdr->itt                = cmd->init_task_tag;
2744         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2745         cmd->stat_sn            = conn->stat_sn;
2746         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2747         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2748         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2749
2750         if (conn->conn_ops->HeaderDigest) {
2751                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2752
2753                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2754                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2755                                 0, NULL, (u8 *)header_digest);
2756
2757                 tx_size += ISCSI_CRC_LEN;
2758                 pr_debug("Attaching CRC32C HeaderDigest to"
2759                         " NopIN 0x%08x\n", *header_digest);
2760         }
2761
2762         cmd->iov_misc[0].iov_base       = cmd->pdu;
2763         cmd->iov_misc[0].iov_len        = tx_size;
2764         cmd->iov_misc_count     = 1;
2765         cmd->tx_size            = tx_size;
2766
2767         pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2768                 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2769
2770         ret = iscsit_send_tx_data(cmd, conn, 1);
2771         if (ret < 0) {
2772                 iscsit_tx_thread_wait_for_tcp(conn);
2773                 return ret;
2774         }
2775
2776         spin_lock_bh(&cmd->istate_lock);
2777         cmd->i_state = want_response ?
2778                 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
2779         spin_unlock_bh(&cmd->istate_lock);
2780
2781         return 0;
2782 }
2783
2784 static int iscsit_send_nopin_response(
2785         struct iscsi_cmd *cmd,
2786         struct iscsi_conn *conn)
2787 {
2788         int niov = 0, tx_size;
2789         u32 padding = 0;
2790         struct kvec *iov;
2791         struct iscsi_nopin *hdr;
2792
2793         tx_size = ISCSI_HDR_LEN;
2794         hdr                     = (struct iscsi_nopin *) cmd->pdu;
2795         memset(hdr, 0, ISCSI_HDR_LEN);
2796         hdr->opcode             = ISCSI_OP_NOOP_IN;
2797         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2798         hton24(hdr->dlength, cmd->buf_ptr_size);
2799         put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2800         hdr->itt                = cmd->init_task_tag;
2801         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2802         cmd->stat_sn            = conn->stat_sn++;
2803         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2804
2805         iscsit_increment_maxcmdsn(cmd, conn->sess);
2806         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2807         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2808
2809         iov = &cmd->iov_misc[0];
2810         iov[niov].iov_base      = cmd->pdu;
2811         iov[niov++].iov_len     = ISCSI_HDR_LEN;
2812
2813         if (conn->conn_ops->HeaderDigest) {
2814                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2815
2816                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2817                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2818                                 0, NULL, (u8 *)header_digest);
2819
2820                 iov[0].iov_len += ISCSI_CRC_LEN;
2821                 tx_size += ISCSI_CRC_LEN;
2822                 pr_debug("Attaching CRC32C HeaderDigest"
2823                         " to NopIn 0x%08x\n", *header_digest);
2824         }
2825
2826         /*
2827          * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2828          * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2829          */
2830         if (cmd->buf_ptr_size) {
2831                 iov[niov].iov_base      = cmd->buf_ptr;
2832                 iov[niov++].iov_len     = cmd->buf_ptr_size;
2833                 tx_size += cmd->buf_ptr_size;
2834
2835                 pr_debug("Echoing back %u bytes of ping"
2836                         " data.\n", cmd->buf_ptr_size);
2837
2838                 padding = ((-cmd->buf_ptr_size) & 3);
2839                 if (padding != 0) {
2840                         iov[niov].iov_base = &cmd->pad_bytes;
2841                         iov[niov++].iov_len = padding;
2842                         tx_size += padding;
2843                         pr_debug("Attaching %u additional"
2844                                 " padding bytes.\n", padding);
2845                 }
2846                 if (conn->conn_ops->DataDigest) {
2847                         iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2848                                 cmd->buf_ptr, cmd->buf_ptr_size,
2849                                 padding, (u8 *)&cmd->pad_bytes,
2850                                 (u8 *)&cmd->data_crc);
2851
2852                         iov[niov].iov_base = &cmd->data_crc;
2853                         iov[niov++].iov_len = ISCSI_CRC_LEN;
2854                         tx_size += ISCSI_CRC_LEN;
2855                         pr_debug("Attached DataDigest for %u"
2856                                 " bytes of ping data, CRC 0x%08x\n",
2857                                 cmd->buf_ptr_size, cmd->data_crc);
2858                 }
2859         }
2860
2861         cmd->iov_misc_count = niov;
2862         cmd->tx_size = tx_size;
2863
2864         pr_debug("Sending NOPIN Response ITT: 0x%08x, TTT:"
2865                 " 0x%08x, StatSN: 0x%08x, Length %u\n", cmd->init_task_tag,
2866                 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2867
2868         return 0;
2869 }
2870
2871 static int iscsit_send_r2t(
2872         struct iscsi_cmd *cmd,
2873         struct iscsi_conn *conn)
2874 {
2875         int tx_size = 0;
2876         struct iscsi_r2t *r2t;
2877         struct iscsi_r2t_rsp *hdr;
2878         int ret;
2879
2880         r2t = iscsit_get_r2t_from_list(cmd);
2881         if (!r2t)
2882                 return -1;
2883
2884         hdr                     = (struct iscsi_r2t_rsp *) cmd->pdu;
2885         memset(hdr, 0, ISCSI_HDR_LEN);
2886         hdr->opcode             = ISCSI_OP_R2T;
2887         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2888         int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2889                         (struct scsi_lun *)&hdr->lun);
2890         hdr->itt                = cmd->init_task_tag;
2891         spin_lock_bh(&conn->sess->ttt_lock);
2892         r2t->targ_xfer_tag      = conn->sess->targ_xfer_tag++;
2893         if (r2t->targ_xfer_tag == 0xFFFFFFFF)
2894                 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
2895         spin_unlock_bh(&conn->sess->ttt_lock);
2896         hdr->ttt                = cpu_to_be32(r2t->targ_xfer_tag);
2897         hdr->statsn             = cpu_to_be32(conn->stat_sn);
2898         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2899         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2900         hdr->r2tsn              = cpu_to_be32(r2t->r2t_sn);
2901         hdr->data_offset        = cpu_to_be32(r2t->offset);
2902         hdr->data_length        = cpu_to_be32(r2t->xfer_len);
2903
2904         cmd->iov_misc[0].iov_base       = cmd->pdu;
2905         cmd->iov_misc[0].iov_len        = ISCSI_HDR_LEN;
2906         tx_size += ISCSI_HDR_LEN;
2907
2908         if (conn->conn_ops->HeaderDigest) {
2909                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2910
2911                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
2912                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
2913                                 0, NULL, (u8 *)header_digest);
2914
2915                 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
2916                 tx_size += ISCSI_CRC_LEN;
2917                 pr_debug("Attaching CRC32 HeaderDigest for R2T"
2918                         " PDU 0x%08x\n", *header_digest);
2919         }
2920
2921         pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
2922                 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
2923                 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
2924                 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
2925                         r2t->offset, r2t->xfer_len, conn->cid);
2926
2927         cmd->iov_misc_count = 1;
2928         cmd->tx_size = tx_size;
2929
2930         spin_lock_bh(&cmd->r2t_lock);
2931         r2t->sent_r2t = 1;
2932         spin_unlock_bh(&cmd->r2t_lock);
2933
2934         ret = iscsit_send_tx_data(cmd, conn, 1);
2935         if (ret < 0) {
2936                 iscsit_tx_thread_wait_for_tcp(conn);
2937                 return ret;
2938         }
2939
2940         spin_lock_bh(&cmd->dataout_timeout_lock);
2941         iscsit_start_dataout_timer(cmd, conn);
2942         spin_unlock_bh(&cmd->dataout_timeout_lock);
2943
2944         return 0;
2945 }
2946
2947 /*
2948  *      @recovery: If called from iscsi_task_reassign_complete_write() for
2949  *              connection recovery.
2950  */
2951 int iscsit_build_r2ts_for_cmd(
2952         struct iscsi_cmd *cmd,
2953         struct iscsi_conn *conn,
2954         bool recovery)
2955 {
2956         int first_r2t = 1;
2957         u32 offset = 0, xfer_len = 0;
2958
2959         spin_lock_bh(&cmd->r2t_lock);
2960         if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
2961                 spin_unlock_bh(&cmd->r2t_lock);
2962                 return 0;
2963         }
2964
2965         if (conn->sess->sess_ops->DataSequenceInOrder &&
2966             !recovery)
2967                 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
2968
2969         while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
2970                 if (conn->sess->sess_ops->DataSequenceInOrder) {
2971                         offset = cmd->r2t_offset;
2972
2973                         if (first_r2t && recovery) {
2974                                 int new_data_end = offset +
2975                                         conn->sess->sess_ops->MaxBurstLength -
2976                                         cmd->next_burst_len;
2977
2978                                 if (new_data_end > cmd->se_cmd.data_length)
2979                                         xfer_len = cmd->se_cmd.data_length - offset;
2980                                 else
2981                                         xfer_len =
2982                                                 conn->sess->sess_ops->MaxBurstLength -
2983                                                 cmd->next_burst_len;
2984                         } else {
2985                                 int new_data_end = offset +
2986                                         conn->sess->sess_ops->MaxBurstLength;
2987
2988                                 if (new_data_end > cmd->se_cmd.data_length)
2989                                         xfer_len = cmd->se_cmd.data_length - offset;
2990                                 else
2991                                         xfer_len = conn->sess->sess_ops->MaxBurstLength;
2992                         }
2993                         cmd->r2t_offset += xfer_len;
2994
2995                         if (cmd->r2t_offset == cmd->se_cmd.data_length)
2996                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
2997                 } else {
2998                         struct iscsi_seq *seq;
2999
3000                         seq = iscsit_get_seq_holder_for_r2t(cmd);
3001                         if (!seq) {
3002                                 spin_unlock_bh(&cmd->r2t_lock);
3003                                 return -1;
3004                         }
3005
3006                         offset = seq->offset;
3007                         xfer_len = seq->xfer_len;
3008
3009                         if (cmd->seq_send_order == cmd->seq_count)
3010                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3011                 }
3012                 cmd->outstanding_r2ts++;
3013                 first_r2t = 0;
3014
3015                 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3016                         spin_unlock_bh(&cmd->r2t_lock);
3017                         return -1;
3018                 }
3019
3020                 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3021                         break;
3022         }
3023         spin_unlock_bh(&cmd->r2t_lock);
3024
3025         return 0;
3026 }
3027
3028 static int iscsit_send_status(
3029         struct iscsi_cmd *cmd,
3030         struct iscsi_conn *conn)
3031 {
3032         u8 iov_count = 0, recovery;
3033         u32 padding = 0, tx_size = 0;
3034         struct iscsi_scsi_rsp *hdr;
3035         struct kvec *iov;
3036
3037         recovery = (cmd->i_state != ISTATE_SEND_STATUS);
3038         if (!recovery)
3039                 cmd->stat_sn = conn->stat_sn++;
3040
3041         spin_lock_bh(&conn->sess->session_stats_lock);
3042         conn->sess->rsp_pdus++;
3043         spin_unlock_bh(&conn->sess->session_stats_lock);
3044
3045         hdr                     = (struct iscsi_scsi_rsp *) cmd->pdu;
3046         memset(hdr, 0, ISCSI_HDR_LEN);
3047         hdr->opcode             = ISCSI_OP_SCSI_CMD_RSP;
3048         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3049         if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3050                 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3051                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3052         } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3053                 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3054                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3055         }
3056         hdr->response           = cmd->iscsi_response;
3057         hdr->cmd_status         = cmd->se_cmd.scsi_status;
3058         hdr->itt                = cmd->init_task_tag;
3059         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3060
3061         iscsit_increment_maxcmdsn(cmd, conn->sess);
3062         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3063         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3064
3065         iov = &cmd->iov_misc[0];
3066         iov[iov_count].iov_base = cmd->pdu;
3067         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3068         tx_size += ISCSI_HDR_LEN;
3069
3070         /*
3071          * Attach SENSE DATA payload to iSCSI Response PDU
3072          */
3073         if (cmd->se_cmd.sense_buffer &&
3074            ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3075             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3076                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3077                 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3078
3079                 padding         = -(cmd->se_cmd.scsi_sense_length) & 3;
3080                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3081                 iov[iov_count].iov_base = cmd->sense_buffer;
3082                 iov[iov_count++].iov_len =
3083                                 (cmd->se_cmd.scsi_sense_length + padding);
3084                 tx_size += cmd->se_cmd.scsi_sense_length;
3085
3086                 if (padding) {
3087                         memset(cmd->sense_buffer +
3088                                 cmd->se_cmd.scsi_sense_length, 0, padding);
3089                         tx_size += padding;
3090                         pr_debug("Adding %u bytes of padding to"
3091                                 " SENSE.\n", padding);
3092                 }
3093
3094                 if (conn->conn_ops->DataDigest) {
3095                         iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3096                                 cmd->sense_buffer,
3097                                 (cmd->se_cmd.scsi_sense_length + padding),
3098                                 0, NULL, (u8 *)&cmd->data_crc);
3099
3100                         iov[iov_count].iov_base    = &cmd->data_crc;
3101                         iov[iov_count++].iov_len     = ISCSI_CRC_LEN;
3102                         tx_size += ISCSI_CRC_LEN;
3103
3104                         pr_debug("Attaching CRC32 DataDigest for"
3105                                 " SENSE, %u bytes CRC 0x%08x\n",
3106                                 (cmd->se_cmd.scsi_sense_length + padding),
3107                                 cmd->data_crc);
3108                 }
3109
3110                 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3111                                 " Response PDU\n",
3112                                 cmd->se_cmd.scsi_sense_length);
3113         }
3114
3115         if (conn->conn_ops->HeaderDigest) {
3116                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3117
3118                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3119                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
3120                                 0, NULL, (u8 *)header_digest);
3121
3122                 iov[0].iov_len += ISCSI_CRC_LEN;
3123                 tx_size += ISCSI_CRC_LEN;
3124                 pr_debug("Attaching CRC32 HeaderDigest for Response"
3125                                 " PDU 0x%08x\n", *header_digest);
3126         }
3127
3128         cmd->iov_misc_count = iov_count;
3129         cmd->tx_size = tx_size;
3130
3131         pr_debug("Built %sSCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3132                 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3133                 (!recovery) ? "" : "Recovery ", cmd->init_task_tag,
3134                 cmd->stat_sn, 0x00, cmd->se_cmd.scsi_status, conn->cid);
3135
3136         return 0;
3137 }
3138
3139 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3140 {
3141         switch (se_tmr->response) {
3142         case TMR_FUNCTION_COMPLETE:
3143                 return ISCSI_TMF_RSP_COMPLETE;
3144         case TMR_TASK_DOES_NOT_EXIST:
3145                 return ISCSI_TMF_RSP_NO_TASK;
3146         case TMR_LUN_DOES_NOT_EXIST:
3147                 return ISCSI_TMF_RSP_NO_LUN;
3148         case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3149                 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3150         case TMR_FUNCTION_AUTHORIZATION_FAILED:
3151                 return ISCSI_TMF_RSP_AUTH_FAILED;
3152         case TMR_FUNCTION_REJECTED:
3153         default:
3154                 return ISCSI_TMF_RSP_REJECTED;
3155         }
3156 }
3157
3158 static int iscsit_send_task_mgt_rsp(
3159         struct iscsi_cmd *cmd,
3160         struct iscsi_conn *conn)
3161 {
3162         struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3163         struct iscsi_tm_rsp *hdr;
3164         u32 tx_size = 0;
3165
3166         hdr                     = (struct iscsi_tm_rsp *) cmd->pdu;
3167         memset(hdr, 0, ISCSI_HDR_LEN);
3168         hdr->opcode             = ISCSI_OP_SCSI_TMFUNC_RSP;
3169         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
3170         hdr->response           = iscsit_convert_tcm_tmr_rsp(se_tmr);
3171         hdr->itt                = cmd->init_task_tag;
3172         cmd->stat_sn            = conn->stat_sn++;
3173         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3174
3175         iscsit_increment_maxcmdsn(cmd, conn->sess);
3176         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3177         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3178
3179         cmd->iov_misc[0].iov_base       = cmd->pdu;
3180         cmd->iov_misc[0].iov_len        = ISCSI_HDR_LEN;
3181         tx_size += ISCSI_HDR_LEN;
3182
3183         if (conn->conn_ops->HeaderDigest) {
3184                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3185
3186                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3187                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
3188                                 0, NULL, (u8 *)header_digest);
3189
3190                 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3191                 tx_size += ISCSI_CRC_LEN;
3192                 pr_debug("Attaching CRC32 HeaderDigest for Task"
3193                         " Mgmt Response PDU 0x%08x\n", *header_digest);
3194         }
3195
3196         cmd->iov_misc_count = 1;
3197         cmd->tx_size = tx_size;
3198
3199         pr_debug("Built Task Management Response ITT: 0x%08x,"
3200                 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3201                 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3202
3203         return 0;
3204 }
3205
3206 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3207 {
3208         bool ret = false;
3209
3210         if (np->np_sockaddr.ss_family == AF_INET6) {
3211                 const struct sockaddr_in6 sin6 = {
3212                         .sin6_addr = IN6ADDR_ANY_INIT };
3213                 struct sockaddr_in6 *sock_in6 =
3214                          (struct sockaddr_in6 *)&np->np_sockaddr;
3215
3216                 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3217                                 sin6.sin6_addr.s6_addr, 16))
3218                         ret = true;
3219         } else {
3220                 struct sockaddr_in * sock_in =
3221                         (struct sockaddr_in *)&np->np_sockaddr;
3222
3223                 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
3224                         ret = true;
3225         }
3226
3227         return ret;
3228 }
3229
3230 #define SENDTARGETS_BUF_LIMIT 32768U
3231
3232 static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd)
3233 {
3234         char *payload = NULL;
3235         struct iscsi_conn *conn = cmd->conn;
3236         struct iscsi_portal_group *tpg;
3237         struct iscsi_tiqn *tiqn;
3238         struct iscsi_tpg_np *tpg_np;
3239         int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3240         unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3241
3242         buffer_len = max(conn->conn_ops->MaxRecvDataSegmentLength,
3243                          SENDTARGETS_BUF_LIMIT);
3244
3245         payload = kzalloc(buffer_len, GFP_KERNEL);
3246         if (!payload) {
3247                 pr_err("Unable to allocate memory for sendtargets"
3248                                 " response.\n");
3249                 return -ENOMEM;
3250         }
3251
3252         spin_lock(&tiqn_lock);
3253         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3254                 len = sprintf(buf, "TargetName=%s", tiqn->tiqn);
3255                 len += 1;
3256
3257                 if ((len + payload_len) > buffer_len) {
3258                         end_of_buf = 1;
3259                         goto eob;
3260                 }
3261                 memcpy(payload + payload_len, buf, len);
3262                 payload_len += len;
3263
3264                 spin_lock(&tiqn->tiqn_tpg_lock);
3265                 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3266
3267                         spin_lock(&tpg->tpg_state_lock);
3268                         if ((tpg->tpg_state == TPG_STATE_FREE) ||
3269                             (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3270                                 spin_unlock(&tpg->tpg_state_lock);
3271                                 continue;
3272                         }
3273                         spin_unlock(&tpg->tpg_state_lock);
3274
3275                         spin_lock(&tpg->tpg_np_lock);
3276                         list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3277                                                 tpg_np_list) {
3278                                 struct iscsi_np *np = tpg_np->tpg_np;
3279                                 bool inaddr_any = iscsit_check_inaddr_any(np);
3280
3281                                 len = sprintf(buf, "TargetAddress="
3282                                         "%s%s%s:%hu,%hu",
3283                                         (np->np_sockaddr.ss_family == AF_INET6) ?
3284                                         "[" : "", (inaddr_any == false) ?
3285                                                 np->np_ip : conn->local_ip,
3286                                         (np->np_sockaddr.ss_family == AF_INET6) ?
3287                                         "]" : "", (inaddr_any == false) ?
3288                                                 np->np_port : conn->local_port,
3289                                         tpg->tpgt);
3290                                 len += 1;
3291
3292                                 if ((len + payload_len) > buffer_len) {
3293                                         spin_unlock(&tpg->tpg_np_lock);
3294                                         spin_unlock(&tiqn->tiqn_tpg_lock);
3295                                         end_of_buf = 1;
3296                                         goto eob;
3297                                 }
3298                                 memcpy(payload + payload_len, buf, len);
3299                                 payload_len += len;
3300                         }
3301                         spin_unlock(&tpg->tpg_np_lock);
3302                 }
3303                 spin_unlock(&tiqn->tiqn_tpg_lock);
3304 eob:
3305                 if (end_of_buf)
3306                         break;
3307         }
3308         spin_unlock(&tiqn_lock);
3309
3310         cmd->buf_ptr = payload;
3311
3312         return payload_len;
3313 }
3314
3315 /*
3316  *      FIXME: Add support for F_BIT and C_BIT when the length is longer than
3317  *      MaxRecvDataSegmentLength.
3318  */
3319 static int iscsit_send_text_rsp(
3320         struct iscsi_cmd *cmd,
3321         struct iscsi_conn *conn)
3322 {
3323         struct iscsi_text_rsp *hdr;
3324         struct kvec *iov;
3325         u32 padding = 0, tx_size = 0;
3326         int text_length, iov_count = 0;
3327
3328         text_length = iscsit_build_sendtargets_response(cmd);
3329         if (text_length < 0)
3330                 return text_length;
3331
3332         padding = ((-text_length) & 3);
3333         if (padding != 0) {
3334                 memset(cmd->buf_ptr + text_length, 0, padding);
3335                 pr_debug("Attaching %u additional bytes for"
3336                         " padding.\n", padding);
3337         }
3338
3339         hdr                     = (struct iscsi_text_rsp *) cmd->pdu;
3340         memset(hdr, 0, ISCSI_HDR_LEN);
3341         hdr->opcode             = ISCSI_OP_TEXT_RSP;
3342         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3343         hton24(hdr->dlength, text_length);
3344         hdr->itt                = cmd->init_task_tag;
3345         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
3346         cmd->stat_sn            = conn->stat_sn++;
3347         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3348
3349         iscsit_increment_maxcmdsn(cmd, conn->sess);
3350         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3351         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3352
3353         iov = &cmd->iov_misc[0];
3354
3355         iov[iov_count].iov_base = cmd->pdu;
3356         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3357         iov[iov_count].iov_base = cmd->buf_ptr;
3358         iov[iov_count++].iov_len = text_length + padding;
3359
3360         tx_size += (ISCSI_HDR_LEN + text_length + padding);
3361
3362         if (conn->conn_ops->HeaderDigest) {
3363                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3364
3365                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3366                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
3367                                 0, NULL, (u8 *)header_digest);
3368
3369                 iov[0].iov_len += ISCSI_CRC_LEN;
3370                 tx_size += ISCSI_CRC_LEN;
3371                 pr_debug("Attaching CRC32 HeaderDigest for"
3372                         " Text Response PDU 0x%08x\n", *header_digest);
3373         }
3374
3375         if (conn->conn_ops->DataDigest) {
3376                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3377                                 cmd->buf_ptr, (text_length + padding),
3378                                 0, NULL, (u8 *)&cmd->data_crc);
3379
3380                 iov[iov_count].iov_base = &cmd->data_crc;
3381                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3382                 tx_size += ISCSI_CRC_LEN;
3383
3384                 pr_debug("Attaching DataDigest for %u bytes of text"
3385                         " data, CRC 0x%08x\n", (text_length + padding),
3386                         cmd->data_crc);
3387         }
3388
3389         cmd->iov_misc_count = iov_count;
3390         cmd->tx_size = tx_size;
3391
3392         pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
3393                 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn,
3394                         text_length, conn->cid);
3395         return 0;
3396 }
3397
3398 static int iscsit_send_reject(
3399         struct iscsi_cmd *cmd,
3400         struct iscsi_conn *conn)
3401 {
3402         u32 iov_count = 0, tx_size = 0;
3403         struct iscsi_reject *hdr;
3404         struct kvec *iov;
3405
3406         hdr                     = (struct iscsi_reject *) cmd->pdu;
3407         hdr->opcode             = ISCSI_OP_REJECT;
3408         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3409         hton24(hdr->dlength, ISCSI_HDR_LEN);
3410         hdr->ffffffff           = cpu_to_be32(0xffffffff);
3411         cmd->stat_sn            = conn->stat_sn++;
3412         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3413         hdr->exp_cmdsn  = cpu_to_be32(conn->sess->exp_cmd_sn);
3414         hdr->max_cmdsn  = cpu_to_be32(conn->sess->max_cmd_sn);
3415
3416         iov = &cmd->iov_misc[0];
3417
3418         iov[iov_count].iov_base = cmd->pdu;
3419         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3420         iov[iov_count].iov_base = cmd->buf_ptr;
3421         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3422
3423         tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3424
3425         if (conn->conn_ops->HeaderDigest) {
3426                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3427
3428                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3429                                 (unsigned char *)hdr, ISCSI_HDR_LEN,
3430                                 0, NULL, (u8 *)header_digest);
3431
3432                 iov[0].iov_len += ISCSI_CRC_LEN;
3433                 tx_size += ISCSI_CRC_LEN;
3434                 pr_debug("Attaching CRC32 HeaderDigest for"
3435                         " REJECT PDU 0x%08x\n", *header_digest);
3436         }
3437
3438         if (conn->conn_ops->DataDigest) {
3439                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3440                                 (unsigned char *)cmd->buf_ptr, ISCSI_HDR_LEN,
3441                                 0, NULL, (u8 *)&cmd->data_crc);
3442
3443                 iov[iov_count].iov_base = &cmd->data_crc;
3444                 iov[iov_count++].iov_len  = ISCSI_CRC_LEN;
3445                 tx_size += ISCSI_CRC_LEN;
3446                 pr_debug("Attaching CRC32 DataDigest for REJECT"
3447                                 " PDU 0x%08x\n", cmd->data_crc);
3448         }
3449
3450         cmd->iov_misc_count = iov_count;
3451         cmd->tx_size = tx_size;
3452
3453         pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3454                 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3455
3456         return 0;
3457 }
3458
3459 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3460 {
3461         struct iscsi_thread_set *ts = conn->thread_set;
3462         int ord, cpu;
3463         /*
3464          * thread_id is assigned from iscsit_global->ts_bitmap from
3465          * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
3466          *
3467          * Here we use thread_id to determine which CPU that this
3468          * iSCSI connection's iscsi_thread_set will be scheduled to
3469          * execute upon.
3470          */
3471         ord = ts->thread_id % cpumask_weight(cpu_online_mask);
3472         for_each_online_cpu(cpu) {
3473                 if (ord-- == 0) {
3474                         cpumask_set_cpu(cpu, conn->conn_cpumask);
3475                         return;
3476                 }
3477         }
3478         /*
3479          * This should never be reached..
3480          */
3481         dump_stack();
3482         cpumask_setall(conn->conn_cpumask);
3483 }
3484
3485 static inline void iscsit_thread_check_cpumask(
3486         struct iscsi_conn *conn,
3487         struct task_struct *p,
3488         int mode)
3489 {
3490         char buf[128];
3491         /*
3492          * mode == 1 signals iscsi_target_tx_thread() usage.
3493          * mode == 0 signals iscsi_target_rx_thread() usage.
3494          */
3495         if (mode == 1) {
3496                 if (!conn->conn_tx_reset_cpumask)
3497                         return;
3498                 conn->conn_tx_reset_cpumask = 0;
3499         } else {
3500                 if (!conn->conn_rx_reset_cpumask)
3501                         return;
3502                 conn->conn_rx_reset_cpumask = 0;
3503         }
3504         /*
3505          * Update the CPU mask for this single kthread so that
3506          * both TX and RX kthreads are scheduled to run on the
3507          * same CPU.
3508          */
3509         memset(buf, 0, 128);
3510         cpumask_scnprintf(buf, 128, conn->conn_cpumask);
3511         set_cpus_allowed_ptr(p, conn->conn_cpumask);
3512 }
3513
3514 static int handle_immediate_queue(struct iscsi_conn *conn)
3515 {
3516         struct iscsi_queue_req *qr;
3517         struct iscsi_cmd *cmd;
3518         u8 state;
3519         int ret;
3520
3521         while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3522                 atomic_set(&conn->check_immediate_queue, 0);
3523                 cmd = qr->cmd;
3524                 state = qr->state;
3525                 kmem_cache_free(lio_qr_cache, qr);
3526
3527                 switch (state) {
3528                 case ISTATE_SEND_R2T:
3529                         ret = iscsit_send_r2t(cmd, conn);
3530                         if (ret < 0)
3531                                 goto err;
3532                         break;
3533                 case ISTATE_REMOVE:
3534                         if (cmd->data_direction == DMA_TO_DEVICE)
3535                                 iscsit_stop_dataout_timer(cmd);
3536
3537                         spin_lock_bh(&conn->cmd_lock);
3538                         list_del(&cmd->i_conn_node);
3539                         spin_unlock_bh(&conn->cmd_lock);
3540
3541                         iscsit_free_cmd(cmd);
3542                         continue;
3543                 case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3544                         iscsit_mod_nopin_response_timer(conn);
3545                         ret = iscsit_send_unsolicited_nopin(cmd,
3546                                                             conn, 1);
3547                         if (ret < 0)
3548                                 goto err;
3549                         break;
3550                 case ISTATE_SEND_NOPIN_NO_RESPONSE:
3551                         ret = iscsit_send_unsolicited_nopin(cmd,
3552                                                             conn, 0);
3553                         if (ret < 0)
3554                                 goto err;
3555                         break;
3556                 default:
3557                         pr_err("Unknown Opcode: 0x%02x ITT:"
3558                                " 0x%08x, i_state: %d on CID: %hu\n",
3559                                cmd->iscsi_opcode, cmd->init_task_tag, state,
3560                                conn->cid);
3561                         goto err;
3562                 }
3563         }
3564
3565         return 0;
3566
3567 err:
3568         return -1;
3569 }
3570
3571 static int handle_response_queue(struct iscsi_conn *conn)
3572 {
3573         struct iscsi_queue_req *qr;
3574         struct iscsi_cmd *cmd;
3575         u8 state;
3576         int ret;
3577
3578         while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3579                 cmd = qr->cmd;
3580                 state = qr->state;
3581                 kmem_cache_free(lio_qr_cache, qr);
3582
3583 check_rsp_state:
3584                 switch (state) {
3585                 case ISTATE_SEND_DATAIN:
3586                         ret = iscsit_send_data_in(cmd, conn);
3587                         if (ret < 0)
3588                                 goto err;
3589                         else if (!ret)
3590                                 /* more drs */
3591                                 goto check_rsp_state;
3592                         else if (ret == 1) {
3593                                 /* all done */
3594                                 spin_lock_bh(&cmd->istate_lock);
3595                                 cmd->i_state = ISTATE_SENT_STATUS;
3596                                 spin_unlock_bh(&cmd->istate_lock);
3597                                 continue;
3598                         } else if (ret == 2) {
3599                                 /* Still must send status,
3600                                    SCF_TRANSPORT_TASK_SENSE was set */
3601                                 spin_lock_bh(&cmd->istate_lock);
3602                                 cmd->i_state = ISTATE_SEND_STATUS;
3603                                 spin_unlock_bh(&cmd->istate_lock);
3604                                 state = ISTATE_SEND_STATUS;
3605                                 goto check_rsp_state;
3606                         }
3607
3608                         break;
3609                 case ISTATE_SEND_STATUS:
3610                 case ISTATE_SEND_STATUS_RECOVERY:
3611                         ret = iscsit_send_status(cmd, conn);
3612                         break;
3613                 case ISTATE_SEND_LOGOUTRSP:
3614                         ret = iscsit_send_logout_response(cmd, conn);
3615                         break;
3616                 case ISTATE_SEND_ASYNCMSG:
3617                         ret = iscsit_send_conn_drop_async_message(
3618                                 cmd, conn);
3619                         break;
3620                 case ISTATE_SEND_NOPIN:
3621                         ret = iscsit_send_nopin_response(cmd, conn);
3622                         break;
3623                 case ISTATE_SEND_REJECT:
3624                         ret = iscsit_send_reject(cmd, conn);
3625                         break;
3626                 case ISTATE_SEND_TASKMGTRSP:
3627                         ret = iscsit_send_task_mgt_rsp(cmd, conn);
3628                         if (ret != 0)
3629                                 break;
3630                         ret = iscsit_tmr_post_handler(cmd, conn);
3631                         if (ret != 0)
3632                                 iscsit_fall_back_to_erl0(conn->sess);
3633                         break;
3634                 case ISTATE_SEND_TEXTRSP:
3635                         ret = iscsit_send_text_rsp(cmd, conn);
3636                         break;
3637                 default:
3638                         pr_err("Unknown Opcode: 0x%02x ITT:"
3639                                " 0x%08x, i_state: %d on CID: %hu\n",
3640                                cmd->iscsi_opcode, cmd->init_task_tag,
3641                                state, conn->cid);
3642                         goto err;
3643                 }
3644                 if (ret < 0)
3645                         goto err;
3646
3647                 if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3648                         iscsit_tx_thread_wait_for_tcp(conn);
3649                         iscsit_unmap_iovec(cmd);
3650                         goto err;
3651                 }
3652                 iscsit_unmap_iovec(cmd);
3653
3654                 switch (state) {
3655                 case ISTATE_SEND_LOGOUTRSP:
3656                         if (!iscsit_logout_post_handler(cmd, conn))
3657                                 goto restart;
3658                         /* fall through */
3659                 case ISTATE_SEND_STATUS:
3660                 case ISTATE_SEND_ASYNCMSG:
3661                 case ISTATE_SEND_NOPIN:
3662                 case ISTATE_SEND_STATUS_RECOVERY:
3663                 case ISTATE_SEND_TEXTRSP:
3664                 case ISTATE_SEND_TASKMGTRSP:
3665                         spin_lock_bh(&cmd->istate_lock);
3666                         cmd->i_state = ISTATE_SENT_STATUS;
3667                         spin_unlock_bh(&cmd->istate_lock);
3668                         break;
3669                 case ISTATE_SEND_REJECT:
3670                         if (cmd->cmd_flags & ICF_REJECT_FAIL_CONN) {
3671                                 cmd->cmd_flags &= ~ICF_REJECT_FAIL_CONN;
3672                                 complete(&cmd->reject_comp);
3673                                 goto err;
3674                         }
3675                         complete(&cmd->reject_comp);
3676                         break;
3677                 default:
3678                         pr_err("Unknown Opcode: 0x%02x ITT:"
3679                                " 0x%08x, i_state: %d on CID: %hu\n",
3680                                cmd->iscsi_opcode, cmd->init_task_tag,
3681                                cmd->i_state, conn->cid);
3682                         goto err;
3683                 }
3684
3685                 if (atomic_read(&conn->check_immediate_queue))
3686                         break;
3687         }
3688
3689         return 0;
3690
3691 err:
3692         return -1;
3693 restart:
3694         return -EAGAIN;
3695 }
3696
3697 int iscsi_target_tx_thread(void *arg)
3698 {
3699         int ret = 0;
3700         struct iscsi_conn *conn;
3701         struct iscsi_thread_set *ts = arg;
3702         /*
3703          * Allow ourselves to be interrupted by SIGINT so that a
3704          * connection recovery / failure event can be triggered externally.
3705          */
3706         allow_signal(SIGINT);
3707
3708 restart:
3709         conn = iscsi_tx_thread_pre_handler(ts);
3710         if (!conn)
3711                 goto out;
3712
3713         ret = 0;
3714
3715         while (!kthread_should_stop()) {
3716                 /*
3717                  * Ensure that both TX and RX per connection kthreads
3718                  * are scheduled to run on the same CPU.
3719                  */
3720                 iscsit_thread_check_cpumask(conn, current, 1);
3721
3722                 schedule_timeout_interruptible(MAX_SCHEDULE_TIMEOUT);
3723
3724                 if ((ts->status == ISCSI_THREAD_SET_RESET) ||
3725                      signal_pending(current))
3726                         goto transport_err;
3727
3728                 ret = handle_immediate_queue(conn);
3729                 if (ret < 0)
3730                         goto transport_err;
3731
3732                 ret = handle_response_queue(conn);
3733                 if (ret == -EAGAIN)
3734                         goto restart;
3735                 else if (ret < 0)
3736                         goto transport_err;
3737         }
3738
3739 transport_err:
3740         iscsit_take_action_for_connection_exit(conn);
3741         goto restart;
3742 out:
3743         return 0;
3744 }
3745
3746 int iscsi_target_rx_thread(void *arg)
3747 {
3748         int ret;
3749         u8 buffer[ISCSI_HDR_LEN], opcode;
3750         u32 checksum = 0, digest = 0;
3751         struct iscsi_conn *conn = NULL;
3752         struct iscsi_thread_set *ts = arg;
3753         struct kvec iov;
3754         /*
3755          * Allow ourselves to be interrupted by SIGINT so that a
3756          * connection recovery / failure event can be triggered externally.
3757          */
3758         allow_signal(SIGINT);
3759
3760 restart:
3761         conn = iscsi_rx_thread_pre_handler(ts);
3762         if (!conn)
3763                 goto out;
3764
3765         while (!kthread_should_stop()) {
3766                 /*
3767                  * Ensure that both TX and RX per connection kthreads
3768                  * are scheduled to run on the same CPU.
3769                  */
3770                 iscsit_thread_check_cpumask(conn, current, 0);
3771
3772                 memset(buffer, 0, ISCSI_HDR_LEN);
3773                 memset(&iov, 0, sizeof(struct kvec));
3774
3775                 iov.iov_base    = buffer;
3776                 iov.iov_len     = ISCSI_HDR_LEN;
3777
3778                 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3779                 if (ret != ISCSI_HDR_LEN) {
3780                         iscsit_rx_thread_wait_for_tcp(conn);
3781                         goto transport_err;
3782                 }
3783
3784                 /*
3785                  * Set conn->bad_hdr for use with REJECT PDUs.
3786                  */
3787                 memcpy(&conn->bad_hdr, &buffer, ISCSI_HDR_LEN);
3788
3789                 if (conn->conn_ops->HeaderDigest) {
3790                         iov.iov_base    = &digest;
3791                         iov.iov_len     = ISCSI_CRC_LEN;
3792
3793                         ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3794                         if (ret != ISCSI_CRC_LEN) {
3795                                 iscsit_rx_thread_wait_for_tcp(conn);
3796                                 goto transport_err;
3797                         }
3798
3799                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
3800                                         buffer, ISCSI_HDR_LEN,
3801                                         0, NULL, (u8 *)&checksum);
3802
3803                         if (digest != checksum) {
3804                                 pr_err("HeaderDigest CRC32C failed,"
3805                                         " received 0x%08x, computed 0x%08x\n",
3806                                         digest, checksum);
3807                                 /*
3808                                  * Set the PDU to 0xff so it will intentionally
3809                                  * hit default in the switch below.
3810                                  */
3811                                 memset(buffer, 0xff, ISCSI_HDR_LEN);
3812                                 spin_lock_bh(&conn->sess->session_stats_lock);
3813                                 conn->sess->conn_digest_errors++;
3814                                 spin_unlock_bh(&conn->sess->session_stats_lock);
3815                         } else {
3816                                 pr_debug("Got HeaderDigest CRC32C"
3817                                                 " 0x%08x\n", checksum);
3818                         }
3819                 }
3820
3821                 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
3822                         goto transport_err;
3823
3824                 opcode = buffer[0] & ISCSI_OPCODE_MASK;
3825
3826                 if (conn->sess->sess_ops->SessionType &&
3827                    ((!(opcode & ISCSI_OP_TEXT)) ||
3828                     (!(opcode & ISCSI_OP_LOGOUT)))) {
3829                         pr_err("Received illegal iSCSI Opcode: 0x%02x"
3830                         " while in Discovery Session, rejecting.\n", opcode);
3831                         iscsit_add_reject(ISCSI_REASON_PROTOCOL_ERROR, 1,
3832                                         buffer, conn);
3833                         goto transport_err;
3834                 }
3835
3836                 switch (opcode) {
3837                 case ISCSI_OP_SCSI_CMD:
3838                         if (iscsit_handle_scsi_cmd(conn, buffer) < 0)
3839                                 goto transport_err;
3840                         break;
3841                 case ISCSI_OP_SCSI_DATA_OUT:
3842                         if (iscsit_handle_data_out(conn, buffer) < 0)
3843                                 goto transport_err;
3844                         break;
3845                 case ISCSI_OP_NOOP_OUT:
3846                         if (iscsit_handle_nop_out(conn, buffer) < 0)
3847                                 goto transport_err;
3848                         break;
3849                 case ISCSI_OP_SCSI_TMFUNC:
3850                         if (iscsit_handle_task_mgt_cmd(conn, buffer) < 0)
3851                                 goto transport_err;
3852                         break;
3853                 case ISCSI_OP_TEXT:
3854                         if (iscsit_handle_text_cmd(conn, buffer) < 0)
3855                                 goto transport_err;
3856                         break;
3857                 case ISCSI_OP_LOGOUT:
3858                         ret = iscsit_handle_logout_cmd(conn, buffer);
3859                         if (ret > 0) {
3860                                 wait_for_completion_timeout(&conn->conn_logout_comp,
3861                                                 SECONDS_FOR_LOGOUT_COMP * HZ);
3862                                 goto transport_err;
3863                         } else if (ret < 0)
3864                                 goto transport_err;
3865                         break;
3866                 case ISCSI_OP_SNACK:
3867                         if (iscsit_handle_snack(conn, buffer) < 0)
3868                                 goto transport_err;
3869                         break;
3870                 default:
3871                         pr_err("Got unknown iSCSI OpCode: 0x%02x\n",
3872                                         opcode);
3873                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3874                                 pr_err("Cannot recover from unknown"
3875                                 " opcode while ERL=0, closing iSCSI connection"
3876                                 ".\n");
3877                                 goto transport_err;
3878                         }
3879                         if (!conn->conn_ops->OFMarker) {
3880                                 pr_err("Unable to recover from unknown"
3881                                 " opcode while OFMarker=No, closing iSCSI"
3882                                         " connection.\n");
3883                                 goto transport_err;
3884                         }
3885                         if (iscsit_recover_from_unknown_opcode(conn) < 0) {
3886                                 pr_err("Unable to recover from unknown"
3887                                         " opcode, closing iSCSI connection.\n");
3888                                 goto transport_err;
3889                         }
3890                         break;
3891                 }
3892         }
3893
3894 transport_err:
3895         if (!signal_pending(current))
3896                 atomic_set(&conn->transport_failed, 1);
3897         iscsit_take_action_for_connection_exit(conn);
3898         goto restart;
3899 out:
3900         return 0;
3901 }
3902
3903 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
3904 {
3905         struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
3906         struct iscsi_session *sess = conn->sess;
3907         /*
3908          * We expect this function to only ever be called from either RX or TX
3909          * thread context via iscsit_close_connection() once the other context
3910          * has been reset -> returned sleeping pre-handler state.
3911          */
3912         spin_lock_bh(&conn->cmd_lock);
3913         list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) {
3914
3915                 list_del(&cmd->i_conn_node);
3916                 spin_unlock_bh(&conn->cmd_lock);
3917
3918                 iscsit_increment_maxcmdsn(cmd, sess);
3919
3920                 iscsit_free_cmd(cmd);
3921
3922                 spin_lock_bh(&conn->cmd_lock);
3923         }
3924         spin_unlock_bh(&conn->cmd_lock);
3925 }
3926
3927 static void iscsit_stop_timers_for_cmds(
3928         struct iscsi_conn *conn)
3929 {
3930         struct iscsi_cmd *cmd;
3931
3932         spin_lock_bh(&conn->cmd_lock);
3933         list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
3934                 if (cmd->data_direction == DMA_TO_DEVICE)
3935                         iscsit_stop_dataout_timer(cmd);
3936         }
3937         spin_unlock_bh(&conn->cmd_lock);
3938 }
3939
3940 int iscsit_close_connection(
3941         struct iscsi_conn *conn)
3942 {
3943         int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
3944         struct iscsi_session    *sess = conn->sess;
3945
3946         pr_debug("Closing iSCSI connection CID %hu on SID:"
3947                 " %u\n", conn->cid, sess->sid);
3948         /*
3949          * Always up conn_logout_comp just in case the RX Thread is sleeping
3950          * and the logout response never got sent because the connection
3951          * failed.
3952          */
3953         complete(&conn->conn_logout_comp);
3954
3955         iscsi_release_thread_set(conn);
3956
3957         iscsit_stop_timers_for_cmds(conn);
3958         iscsit_stop_nopin_response_timer(conn);
3959         iscsit_stop_nopin_timer(conn);
3960         iscsit_free_queue_reqs_for_conn(conn);
3961
3962         /*
3963          * During Connection recovery drop unacknowledged out of order
3964          * commands for this connection, and prepare the other commands
3965          * for realligence.
3966          *
3967          * During normal operation clear the out of order commands (but
3968          * do not free the struct iscsi_ooo_cmdsn's) and release all
3969          * struct iscsi_cmds.
3970          */
3971         if (atomic_read(&conn->connection_recovery)) {
3972                 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
3973                 iscsit_prepare_cmds_for_realligance(conn);
3974         } else {
3975                 iscsit_clear_ooo_cmdsns_for_conn(conn);
3976                 iscsit_release_commands_from_conn(conn);
3977         }
3978
3979         /*
3980          * Handle decrementing session or connection usage count if
3981          * a logout response was not able to be sent because the
3982          * connection failed.  Fall back to Session Recovery here.
3983          */
3984         if (atomic_read(&conn->conn_logout_remove)) {
3985                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
3986                         iscsit_dec_conn_usage_count(conn);
3987                         iscsit_dec_session_usage_count(sess);
3988                 }
3989                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
3990                         iscsit_dec_conn_usage_count(conn);
3991
3992                 atomic_set(&conn->conn_logout_remove, 0);
3993                 atomic_set(&sess->session_reinstatement, 0);
3994                 atomic_set(&sess->session_fall_back_to_erl0, 1);
3995         }
3996
3997         spin_lock_bh(&sess->conn_lock);
3998         list_del(&conn->conn_list);
3999
4000         /*
4001          * Attempt to let the Initiator know this connection failed by
4002          * sending an Connection Dropped Async Message on another
4003          * active connection.
4004          */
4005         if (atomic_read(&conn->connection_recovery))
4006                 iscsit_build_conn_drop_async_message(conn);
4007
4008         spin_unlock_bh(&sess->conn_lock);
4009
4010         /*
4011          * If connection reinstatement is being performed on this connection,
4012          * up the connection reinstatement semaphore that is being blocked on
4013          * in iscsit_cause_connection_reinstatement().
4014          */
4015         spin_lock_bh(&conn->state_lock);
4016         if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4017                 spin_unlock_bh(&conn->state_lock);
4018                 complete(&conn->conn_wait_comp);
4019                 wait_for_completion(&conn->conn_post_wait_comp);
4020                 spin_lock_bh(&conn->state_lock);
4021         }
4022
4023         /*
4024          * If connection reinstatement is being performed on this connection
4025          * by receiving a REMOVECONNFORRECOVERY logout request, up the
4026          * connection wait rcfr semaphore that is being blocked on
4027          * an iscsit_connection_reinstatement_rcfr().
4028          */
4029         if (atomic_read(&conn->connection_wait_rcfr)) {
4030                 spin_unlock_bh(&conn->state_lock);
4031                 complete(&conn->conn_wait_rcfr_comp);
4032                 wait_for_completion(&conn->conn_post_wait_comp);
4033                 spin_lock_bh(&conn->state_lock);
4034         }
4035         atomic_set(&conn->connection_reinstatement, 1);
4036         spin_unlock_bh(&conn->state_lock);
4037
4038         /*
4039          * If any other processes are accessing this connection pointer we
4040          * must wait until they have completed.
4041          */
4042         iscsit_check_conn_usage_count(conn);
4043
4044         if (conn->conn_rx_hash.tfm)
4045                 crypto_free_hash(conn->conn_rx_hash.tfm);
4046         if (conn->conn_tx_hash.tfm)
4047                 crypto_free_hash(conn->conn_tx_hash.tfm);
4048
4049         if (conn->conn_cpumask)
4050                 free_cpumask_var(conn->conn_cpumask);
4051
4052         kfree(conn->conn_ops);
4053         conn->conn_ops = NULL;
4054
4055         if (conn->sock)
4056                 sock_release(conn->sock);
4057         conn->thread_set = NULL;
4058
4059         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4060         conn->conn_state = TARG_CONN_STATE_FREE;
4061         kfree(conn);
4062
4063         spin_lock_bh(&sess->conn_lock);
4064         atomic_dec(&sess->nconn);
4065         pr_debug("Decremented iSCSI connection count to %hu from node:"
4066                 " %s\n", atomic_read(&sess->nconn),
4067                 sess->sess_ops->InitiatorName);
4068         /*
4069          * Make sure that if one connection fails in an non ERL=2 iSCSI
4070          * Session that they all fail.
4071          */
4072         if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4073              !atomic_read(&sess->session_logout))
4074                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4075
4076         /*
4077          * If this was not the last connection in the session, and we are
4078          * performing session reinstatement or falling back to ERL=0, call
4079          * iscsit_stop_session() without sleeping to shutdown the other
4080          * active connections.
4081          */
4082         if (atomic_read(&sess->nconn)) {
4083                 if (!atomic_read(&sess->session_reinstatement) &&
4084                     !atomic_read(&sess->session_fall_back_to_erl0)) {
4085                         spin_unlock_bh(&sess->conn_lock);
4086                         return 0;
4087                 }
4088                 if (!atomic_read(&sess->session_stop_active)) {
4089                         atomic_set(&sess->session_stop_active, 1);
4090                         spin_unlock_bh(&sess->conn_lock);
4091                         iscsit_stop_session(sess, 0, 0);
4092                         return 0;
4093                 }
4094                 spin_unlock_bh(&sess->conn_lock);
4095                 return 0;
4096         }
4097
4098         /*
4099          * If this was the last connection in the session and one of the
4100          * following is occurring:
4101          *
4102          * Session Reinstatement is not being performed, and are falling back
4103          * to ERL=0 call iscsit_close_session().
4104          *
4105          * Session Logout was requested.  iscsit_close_session() will be called
4106          * elsewhere.
4107          *
4108          * Session Continuation is not being performed, start the Time2Retain
4109          * handler and check if sleep_on_sess_wait_sem is active.
4110          */
4111         if (!atomic_read(&sess->session_reinstatement) &&
4112              atomic_read(&sess->session_fall_back_to_erl0)) {
4113                 spin_unlock_bh(&sess->conn_lock);
4114                 target_put_session(sess->se_sess);
4115
4116                 return 0;
4117         } else if (atomic_read(&sess->session_logout)) {
4118                 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4119                 sess->session_state = TARG_SESS_STATE_FREE;
4120                 spin_unlock_bh(&sess->conn_lock);
4121
4122                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4123                         complete(&sess->session_wait_comp);
4124
4125                 return 0;
4126         } else {
4127                 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4128                 sess->session_state = TARG_SESS_STATE_FAILED;
4129
4130                 if (!atomic_read(&sess->session_continuation)) {
4131                         spin_unlock_bh(&sess->conn_lock);
4132                         iscsit_start_time2retain_handler(sess);
4133                 } else
4134                         spin_unlock_bh(&sess->conn_lock);
4135
4136                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4137                         complete(&sess->session_wait_comp);
4138
4139                 return 0;
4140         }
4141         spin_unlock_bh(&sess->conn_lock);
4142
4143         return 0;
4144 }
4145
4146 int iscsit_close_session(struct iscsi_session *sess)
4147 {
4148         struct iscsi_portal_group *tpg = ISCSI_TPG_S(sess);
4149         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4150
4151         if (atomic_read(&sess->nconn)) {
4152                 pr_err("%d connection(s) still exist for iSCSI session"
4153                         " to %s\n", atomic_read(&sess->nconn),
4154                         sess->sess_ops->InitiatorName);
4155                 BUG();
4156         }
4157
4158         spin_lock_bh(&se_tpg->session_lock);
4159         atomic_set(&sess->session_logout, 1);
4160         atomic_set(&sess->session_reinstatement, 1);
4161         iscsit_stop_time2retain_timer(sess);
4162         spin_unlock_bh(&se_tpg->session_lock);
4163
4164         /*
4165          * transport_deregister_session_configfs() will clear the
4166          * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4167          * can be setting it again with __transport_register_session() in
4168          * iscsi_post_login_handler() again after the iscsit_stop_session()
4169          * completes in iscsi_np context.
4170          */
4171         transport_deregister_session_configfs(sess->se_sess);
4172
4173         /*
4174          * If any other processes are accessing this session pointer we must
4175          * wait until they have completed.  If we are in an interrupt (the
4176          * time2retain handler) and contain and active session usage count we
4177          * restart the timer and exit.
4178          */
4179         if (!in_interrupt()) {
4180                 if (iscsit_check_session_usage_count(sess) == 1)
4181                         iscsit_stop_session(sess, 1, 1);
4182         } else {
4183                 if (iscsit_check_session_usage_count(sess) == 2) {
4184                         atomic_set(&sess->session_logout, 0);
4185                         iscsit_start_time2retain_handler(sess);
4186                         return 0;
4187                 }
4188         }
4189
4190         transport_deregister_session(sess->se_sess);
4191
4192         if (sess->sess_ops->ErrorRecoveryLevel == 2)
4193                 iscsit_free_connection_recovery_entires(sess);
4194
4195         iscsit_free_all_ooo_cmdsns(sess);
4196
4197         spin_lock_bh(&se_tpg->session_lock);
4198         pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4199         sess->session_state = TARG_SESS_STATE_FREE;
4200         pr_debug("Released iSCSI session from node: %s\n",
4201                         sess->sess_ops->InitiatorName);
4202         tpg->nsessions--;
4203         if (tpg->tpg_tiqn)
4204                 tpg->tpg_tiqn->tiqn_nsessions--;
4205
4206         pr_debug("Decremented number of active iSCSI Sessions on"
4207                 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4208
4209         spin_lock(&sess_idr_lock);
4210         idr_remove(&sess_idr, sess->session_index);
4211         spin_unlock(&sess_idr_lock);
4212
4213         kfree(sess->sess_ops);
4214         sess->sess_ops = NULL;
4215         spin_unlock_bh(&se_tpg->session_lock);
4216
4217         kfree(sess);
4218         return 0;
4219 }
4220
4221 static void iscsit_logout_post_handler_closesession(
4222         struct iscsi_conn *conn)
4223 {
4224         struct iscsi_session *sess = conn->sess;
4225
4226         iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4227         iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4228
4229         atomic_set(&conn->conn_logout_remove, 0);
4230         complete(&conn->conn_logout_comp);
4231
4232         iscsit_dec_conn_usage_count(conn);
4233         iscsit_stop_session(sess, 1, 1);
4234         iscsit_dec_session_usage_count(sess);
4235         target_put_session(sess->se_sess);
4236 }
4237
4238 static void iscsit_logout_post_handler_samecid(
4239         struct iscsi_conn *conn)
4240 {
4241         iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4242         iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4243
4244         atomic_set(&conn->conn_logout_remove, 0);
4245         complete(&conn->conn_logout_comp);
4246
4247         iscsit_cause_connection_reinstatement(conn, 1);
4248         iscsit_dec_conn_usage_count(conn);
4249 }
4250
4251 static void iscsit_logout_post_handler_diffcid(
4252         struct iscsi_conn *conn,
4253         u16 cid)
4254 {
4255         struct iscsi_conn *l_conn;
4256         struct iscsi_session *sess = conn->sess;
4257
4258         if (!sess)
4259                 return;
4260
4261         spin_lock_bh(&sess->conn_lock);
4262         list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4263                 if (l_conn->cid == cid) {
4264                         iscsit_inc_conn_usage_count(l_conn);
4265                         break;
4266                 }
4267         }
4268         spin_unlock_bh(&sess->conn_lock);
4269
4270         if (!l_conn)
4271                 return;
4272
4273         if (l_conn->sock)
4274                 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4275
4276         spin_lock_bh(&l_conn->state_lock);
4277         pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4278         l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4279         spin_unlock_bh(&l_conn->state_lock);
4280
4281         iscsit_cause_connection_reinstatement(l_conn, 1);
4282         iscsit_dec_conn_usage_count(l_conn);
4283 }
4284
4285 /*
4286  *      Return of 0 causes the TX thread to restart.
4287  */
4288 static int iscsit_logout_post_handler(
4289         struct iscsi_cmd *cmd,
4290         struct iscsi_conn *conn)
4291 {
4292         int ret = 0;
4293
4294         switch (cmd->logout_reason) {
4295         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4296                 switch (cmd->logout_response) {
4297                 case ISCSI_LOGOUT_SUCCESS:
4298                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4299                 default:
4300                         iscsit_logout_post_handler_closesession(conn);
4301                         break;
4302                 }
4303                 ret = 0;
4304                 break;
4305         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4306                 if (conn->cid == cmd->logout_cid) {
4307                         switch (cmd->logout_response) {
4308                         case ISCSI_LOGOUT_SUCCESS:
4309                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4310                         default:
4311                                 iscsit_logout_post_handler_samecid(conn);
4312                                 break;
4313                         }
4314                         ret = 0;
4315                 } else {
4316                         switch (cmd->logout_response) {
4317                         case ISCSI_LOGOUT_SUCCESS:
4318                                 iscsit_logout_post_handler_diffcid(conn,
4319                                         cmd->logout_cid);
4320                                 break;
4321                         case ISCSI_LOGOUT_CID_NOT_FOUND:
4322                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4323                         default:
4324                                 break;
4325                         }
4326                         ret = 1;
4327                 }
4328                 break;
4329         case ISCSI_LOGOUT_REASON_RECOVERY:
4330                 switch (cmd->logout_response) {
4331                 case ISCSI_LOGOUT_SUCCESS:
4332                 case ISCSI_LOGOUT_CID_NOT_FOUND:
4333                 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4334                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4335                 default:
4336                         break;
4337                 }
4338                 ret = 1;
4339                 break;
4340         default:
4341                 break;
4342
4343         }
4344         return ret;
4345 }
4346
4347 void iscsit_fail_session(struct iscsi_session *sess)
4348 {
4349         struct iscsi_conn *conn;
4350
4351         spin_lock_bh(&sess->conn_lock);
4352         list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4353                 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4354                 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4355         }
4356         spin_unlock_bh(&sess->conn_lock);
4357
4358         pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4359         sess->session_state = TARG_SESS_STATE_FAILED;
4360 }
4361
4362 int iscsit_free_session(struct iscsi_session *sess)
4363 {
4364         u16 conn_count = atomic_read(&sess->nconn);
4365         struct iscsi_conn *conn, *conn_tmp = NULL;
4366         int is_last;
4367
4368         spin_lock_bh(&sess->conn_lock);
4369         atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4370
4371         list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4372                         conn_list) {
4373                 if (conn_count == 0)
4374                         break;
4375
4376                 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4377                         is_last = 1;
4378                 } else {
4379                         iscsit_inc_conn_usage_count(conn_tmp);
4380                         is_last = 0;
4381                 }
4382                 iscsit_inc_conn_usage_count(conn);
4383
4384                 spin_unlock_bh(&sess->conn_lock);
4385                 iscsit_cause_connection_reinstatement(conn, 1);
4386                 spin_lock_bh(&sess->conn_lock);
4387
4388                 iscsit_dec_conn_usage_count(conn);
4389                 if (is_last == 0)
4390                         iscsit_dec_conn_usage_count(conn_tmp);
4391
4392                 conn_count--;
4393         }
4394
4395         if (atomic_read(&sess->nconn)) {
4396                 spin_unlock_bh(&sess->conn_lock);
4397                 wait_for_completion(&sess->session_wait_comp);
4398         } else
4399                 spin_unlock_bh(&sess->conn_lock);
4400
4401         target_put_session(sess->se_sess);
4402         return 0;
4403 }
4404
4405 void iscsit_stop_session(
4406         struct iscsi_session *sess,
4407         int session_sleep,
4408         int connection_sleep)
4409 {
4410         u16 conn_count = atomic_read(&sess->nconn);
4411         struct iscsi_conn *conn, *conn_tmp = NULL;
4412         int is_last;
4413
4414         spin_lock_bh(&sess->conn_lock);
4415         if (session_sleep)
4416                 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4417
4418         if (connection_sleep) {
4419                 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4420                                 conn_list) {
4421                         if (conn_count == 0)
4422                                 break;
4423
4424                         if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4425                                 is_last = 1;
4426                         } else {
4427                                 iscsit_inc_conn_usage_count(conn_tmp);
4428                                 is_last = 0;
4429                         }
4430                         iscsit_inc_conn_usage_count(conn);
4431
4432                         spin_unlock_bh(&sess->conn_lock);
4433                         iscsit_cause_connection_reinstatement(conn, 1);
4434                         spin_lock_bh(&sess->conn_lock);
4435
4436                         iscsit_dec_conn_usage_count(conn);
4437                         if (is_last == 0)
4438                                 iscsit_dec_conn_usage_count(conn_tmp);
4439                         conn_count--;
4440                 }
4441         } else {
4442                 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4443                         iscsit_cause_connection_reinstatement(conn, 0);
4444         }
4445
4446         if (session_sleep && atomic_read(&sess->nconn)) {
4447                 spin_unlock_bh(&sess->conn_lock);
4448                 wait_for_completion(&sess->session_wait_comp);
4449         } else
4450                 spin_unlock_bh(&sess->conn_lock);
4451 }
4452
4453 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4454 {
4455         struct iscsi_session *sess;
4456         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4457         struct se_session *se_sess, *se_sess_tmp;
4458         int session_count = 0;
4459
4460         spin_lock_bh(&se_tpg->session_lock);
4461         if (tpg->nsessions && !force) {
4462                 spin_unlock_bh(&se_tpg->session_lock);
4463                 return -1;
4464         }
4465
4466         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4467                         sess_list) {
4468                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4469
4470                 spin_lock(&sess->conn_lock);
4471                 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4472                     atomic_read(&sess->session_logout) ||
4473                     (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4474                         spin_unlock(&sess->conn_lock);
4475                         continue;
4476                 }
4477                 atomic_set(&sess->session_reinstatement, 1);
4478                 spin_unlock(&sess->conn_lock);
4479                 spin_unlock_bh(&se_tpg->session_lock);
4480
4481                 iscsit_free_session(sess);
4482                 spin_lock_bh(&se_tpg->session_lock);
4483
4484                 session_count++;
4485         }
4486         spin_unlock_bh(&se_tpg->session_lock);
4487
4488         pr_debug("Released %d iSCSI Session(s) from Target Portal"
4489                         " Group: %hu\n", session_count, tpg->tpgt);
4490         return 0;
4491 }
4492
4493 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4494 MODULE_VERSION("4.1.x");
4495 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4496 MODULE_LICENSE("GPL");
4497
4498 module_init(iscsi_target_init_module);
4499 module_exit(iscsi_target_cleanup_module);