drivers/target/iscsi/iscsi_target.c

   1 /*******************************************************************************
   2  * This file contains main functions related to the iSCSI Target Core Driver.
   3  *
   4  * (c) Copyright 2007-2013 Datera, Inc.
   5  *
   6  * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  ******************************************************************************/
  18
  19 #include <linux/string.h>
  20 #include <linux/kthread.h>
  21 #include <linux/crypto.h>
  22 #include <linux/completion.h>
  23 #include <linux/module.h>
  24 #include <linux/vmalloc.h>
  25 #include <linux/idr.h>
  26 #include <asm/unaligned.h>
  27 #include <scsi/scsi_proto.h>
  28 #include <scsi/iscsi_proto.h>
  29 #include <scsi/scsi_tcq.h>
  30 #include <target/target_core_base.h>
  31 #include <target/target_core_fabric.h>
  32
  33 #include <target/iscsi/iscsi_target_core.h>
  34 #include "iscsi_target_parameters.h"
  35 #include "iscsi_target_seq_pdu_list.h"
  36 #include "iscsi_target_datain_values.h"
  37 #include "iscsi_target_erl0.h"
  38 #include "iscsi_target_erl1.h"
  39 #include "iscsi_target_erl2.h"
  40 #include "iscsi_target_login.h"
  41 #include "iscsi_target_tmr.h"
  42 #include "iscsi_target_tpg.h"
  43 #include "iscsi_target_util.h"
  44 #include "iscsi_target.h"
  45 #include "iscsi_target_device.h"
  46 #include <target/iscsi/iscsi_target_stat.h>
  47
  48 #include <target/iscsi/iscsi_transport.h>
  49
  50 static LIST_HEAD(g_tiqn_list);
  51 static LIST_HEAD(g_np_list);
  52 static DEFINE_SPINLOCK(tiqn_lock);
  53 static DEFINE_MUTEX(np_lock);
  54
  55 static struct idr tiqn_idr;
  56 struct idr sess_idr;
  57 struct mutex auth_id_lock;
  58 spinlock_t sess_idr_lock;
  59
  60 struct iscsit_global *iscsit_global;
  61
  62 struct kmem_cache *lio_qr_cache;
  63 struct kmem_cache *lio_dr_cache;
  64 struct kmem_cache *lio_ooo_cache;
  65 struct kmem_cache *lio_r2t_cache;
  66
  67 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
  68                         struct iscsi_scsi_req *, u32);
  69
  70 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
  71 {
  72         struct iscsi_tiqn *tiqn = NULL;
  73
  74         spin_lock(&tiqn_lock);
  75         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
  76                 if (!strcmp(tiqn->tiqn, buf)) {
  77
  78                         spin_lock(&tiqn->tiqn_state_lock);
  79                         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
  80                                 tiqn->tiqn_access_count++;
  81                                 spin_unlock(&tiqn->tiqn_state_lock);
  82                                 spin_unlock(&tiqn_lock);
  83                                 return tiqn;
  84                         }
  85                         spin_unlock(&tiqn->tiqn_state_lock);
  86                 }
  87         }
  88         spin_unlock(&tiqn_lock);
  89
  90         return NULL;
  91 }
  92
  93 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
  94 {
  95         spin_lock(&tiqn->tiqn_state_lock);
  96         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
  97                 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
  98                 spin_unlock(&tiqn->tiqn_state_lock);
  99                 return 0;
 100         }
 101         spin_unlock(&tiqn->tiqn_state_lock);
 102
 103         return -1;
 104 }
 105
 106 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
 107 {
 108         spin_lock(&tiqn->tiqn_state_lock);
 109         tiqn->tiqn_access_count--;
 110         spin_unlock(&tiqn->tiqn_state_lock);
 111 }
 112
 113 /*
 114  * Note that IQN formatting is expected to be done in userspace, and
 115  * no explict IQN format checks are done here.
 116  */
 117 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
 118 {
 119         struct iscsi_tiqn *tiqn = NULL;
 120         int ret;
 121
 122         if (strlen(buf) >= ISCSI_IQN_LEN) {
 123                 pr_err("Target IQN exceeds %d bytes\n",
 124                                 ISCSI_IQN_LEN);
 125                 return ERR_PTR(-EINVAL);
 126         }
 127
 128         tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL);
 129         if (!tiqn) {
 130                 pr_err("Unable to allocate struct iscsi_tiqn\n");
 131                 return ERR_PTR(-ENOMEM);
 132         }
 133
 134         sprintf(tiqn->tiqn, "%s", buf);
 135         INIT_LIST_HEAD(&tiqn->tiqn_list);
 136         INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
 137         spin_lock_init(&tiqn->tiqn_state_lock);
 138         spin_lock_init(&tiqn->tiqn_tpg_lock);
 139         spin_lock_init(&tiqn->sess_err_stats.lock);
 140         spin_lock_init(&tiqn->login_stats.lock);
 141         spin_lock_init(&tiqn->logout_stats.lock);
 142
 143         tiqn->tiqn_state = TIQN_STATE_ACTIVE;
 144
 145         idr_preload(GFP_KERNEL);
 146         spin_lock(&tiqn_lock);
 147
 148         ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
 149         if (ret < 0) {
 150                 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
 151                 spin_unlock(&tiqn_lock);
 152                 idr_preload_end();
 153                 kfree(tiqn);
 154                 return ERR_PTR(ret);
 155         }
 156         tiqn->tiqn_index = ret;
 157         list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
 158
 159         spin_unlock(&tiqn_lock);
 160         idr_preload_end();
 161
 162         pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
 163
 164         return tiqn;
 165
 166 }
 167
 168 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
 169 {
 170         /*
 171          * Wait for accesses to said struct iscsi_tiqn to end.
 172          */
 173         spin_lock(&tiqn->tiqn_state_lock);
 174         while (tiqn->tiqn_access_count != 0) {
 175                 spin_unlock(&tiqn->tiqn_state_lock);
 176                 msleep(10);
 177                 spin_lock(&tiqn->tiqn_state_lock);
 178         }
 179         spin_unlock(&tiqn->tiqn_state_lock);
 180 }
 181
 182 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
 183 {
 184         /*
 185          * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
 186          * while holding tiqn->tiqn_state_lock.  This means that all subsequent
 187          * attempts to access this struct iscsi_tiqn will fail from both transport
 188          * fabric and control code paths.
 189          */
 190         if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
 191                 pr_err("iscsit_set_tiqn_shutdown() failed\n");
 192                 return;
 193         }
 194
 195         iscsit_wait_for_tiqn(tiqn);
 196
 197         spin_lock(&tiqn_lock);
 198         list_del(&tiqn->tiqn_list);
 199         idr_remove(&tiqn_idr, tiqn->tiqn_index);
 200         spin_unlock(&tiqn_lock);
 201
 202         pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
 203                         tiqn->tiqn);
 204         kfree(tiqn);
 205 }
 206
 207 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
 208 {
 209         int ret;
 210         /*
 211          * Determine if the network portal is accepting storage traffic.
 212          */
 213         spin_lock_bh(&np->np_thread_lock);
 214         if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 215                 spin_unlock_bh(&np->np_thread_lock);
 216                 return -1;
 217         }
 218         spin_unlock_bh(&np->np_thread_lock);
 219         /*
 220          * Determine if the portal group is accepting storage traffic.
 221          */
 222         spin_lock_bh(&tpg->tpg_state_lock);
 223         if (tpg->tpg_state != TPG_STATE_ACTIVE) {
 224                 spin_unlock_bh(&tpg->tpg_state_lock);
 225                 return -1;
 226         }
 227         spin_unlock_bh(&tpg->tpg_state_lock);
 228
 229         /*
 230          * Here we serialize access across the TIQN+TPG Tuple.
 231          */
 232         ret = down_interruptible(&tpg->np_login_sem);
 233         if (ret != 0)
 234                 return -1;
 235
 236         spin_lock_bh(&tpg->tpg_state_lock);
 237         if (tpg->tpg_state != TPG_STATE_ACTIVE) {
 238                 spin_unlock_bh(&tpg->tpg_state_lock);
 239                 up(&tpg->np_login_sem);
 240                 return -1;
 241         }
 242         spin_unlock_bh(&tpg->tpg_state_lock);
 243
 244         return 0;
 245 }
 246
 247 void iscsit_login_kref_put(struct kref *kref)
 248 {
 249         struct iscsi_tpg_np *tpg_np = container_of(kref,
 250                                 struct iscsi_tpg_np, tpg_np_kref);
 251
 252         complete(&tpg_np->tpg_np_comp);
 253 }
 254
 255 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg,
 256                        struct iscsi_tpg_np *tpg_np)
 257 {
 258         struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
 259
 260         up(&tpg->np_login_sem);
 261
 262         if (tpg_np)
 263                 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
 264
 265         if (tiqn)
 266                 iscsit_put_tiqn_for_login(tiqn);
 267
 268         return 0;
 269 }
 270
 271 bool iscsit_check_np_match(
 272         struct sockaddr_storage *sockaddr,
 273         struct iscsi_np *np,
 274         int network_transport)
 275 {
 276         struct sockaddr_in *sock_in, *sock_in_e;
 277         struct sockaddr_in6 *sock_in6, *sock_in6_e;
 278         bool ip_match = false;
 279         u16 port, port_e;
 280
 281         if (sockaddr->ss_family == AF_INET6) {
 282                 sock_in6 = (struct sockaddr_in6 *)sockaddr;
 283                 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
 284
 285                 if (!memcmp(&sock_in6->sin6_addr.in6_u,
 286                             &sock_in6_e->sin6_addr.in6_u,
 287                             sizeof(struct in6_addr)))
 288                         ip_match = true;
 289
 290                 port = ntohs(sock_in6->sin6_port);
 291                 port_e = ntohs(sock_in6_e->sin6_port);
 292         } else {
 293                 sock_in = (struct sockaddr_in *)sockaddr;
 294                 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
 295
 296                 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
 297                         ip_match = true;
 298
 299                 port = ntohs(sock_in->sin_port);
 300                 port_e = ntohs(sock_in_e->sin_port);
 301         }
 302
 303         if (ip_match && (port_e == port) &&
 304             (np->np_network_transport == network_transport))
 305                 return true;
 306
 307         return false;
 308 }
 309
 310 /*
 311  * Called with mutex np_lock held
 312  */
 313 static struct iscsi_np *iscsit_get_np(
 314         struct sockaddr_storage *sockaddr,
 315         int network_transport)
 316 {
 317         struct iscsi_np *np;
 318         bool match;
 319
 320         list_for_each_entry(np, &g_np_list, np_list) {
 321                 spin_lock_bh(&np->np_thread_lock);
 322                 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 323                         spin_unlock_bh(&np->np_thread_lock);
 324                         continue;
 325                 }
 326
 327                 match = iscsit_check_np_match(sockaddr, np, network_transport);
 328                 if (match) {
 329                         /*
 330                          * Increment the np_exports reference count now to
 331                          * prevent iscsit_del_np() below from being called
 332                          * while iscsi_tpg_add_network_portal() is called.
 333                          */
 334                         np->np_exports++;
 335                         spin_unlock_bh(&np->np_thread_lock);
 336                         return np;
 337                 }
 338                 spin_unlock_bh(&np->np_thread_lock);
 339         }
 340
 341         return NULL;
 342 }
 343
 344 struct iscsi_np *iscsit_add_np(
 345         struct sockaddr_storage *sockaddr,
 346         int network_transport)
 347 {
 348         struct iscsi_np *np;
 349         int ret;
 350
 351         mutex_lock(&np_lock);
 352
 353         /*
 354          * Locate the existing struct iscsi_np if already active..
 355          */
 356         np = iscsit_get_np(sockaddr, network_transport);
 357         if (np) {
 358                 mutex_unlock(&np_lock);
 359                 return np;
 360         }
 361
 362         np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
 363         if (!np) {
 364                 pr_err("Unable to allocate memory for struct iscsi_np\n");
 365                 mutex_unlock(&np_lock);
 366                 return ERR_PTR(-ENOMEM);
 367         }
 368
 369         np->np_flags |= NPF_IP_NETWORK;
 370         np->np_network_transport = network_transport;
 371         spin_lock_init(&np->np_thread_lock);
 372         init_completion(&np->np_restart_comp);
 373         INIT_LIST_HEAD(&np->np_list);
 374
 375         ret = iscsi_target_setup_login_socket(np, sockaddr);
 376         if (ret != 0) {
 377                 kfree(np);
 378                 mutex_unlock(&np_lock);
 379                 return ERR_PTR(ret);
 380         }
 381
 382         np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
 383         if (IS_ERR(np->np_thread)) {
 384                 pr_err("Unable to create kthread: iscsi_np\n");
 385                 ret = PTR_ERR(np->np_thread);
 386                 kfree(np);
 387                 mutex_unlock(&np_lock);
 388                 return ERR_PTR(ret);
 389         }
 390         /*
 391          * Increment the np_exports reference count now to prevent
 392          * iscsit_del_np() below from being run while a new call to
 393          * iscsi_tpg_add_network_portal() for a matching iscsi_np is
 394          * active.  We don't need to hold np->np_thread_lock at this
 395          * point because iscsi_np has not been added to g_np_list yet.
 396          */
 397         np->np_exports = 1;
 398         np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
 399
 400         list_add_tail(&np->np_list, &g_np_list);
 401         mutex_unlock(&np_lock);
 402
 403         pr_debug("CORE[0] - Added Network Portal: %pISpc on %s\n",
 404                 &np->np_sockaddr, np->np_transport->name);
 405
 406         return np;
 407 }
 408
 409 int iscsit_reset_np_thread(
 410         struct iscsi_np *np,
 411         struct iscsi_tpg_np *tpg_np,
 412         struct iscsi_portal_group *tpg,
 413         bool shutdown)
 414 {
 415         spin_lock_bh(&np->np_thread_lock);
 416         if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
 417                 spin_unlock_bh(&np->np_thread_lock);
 418                 return 0;
 419         }
 420         np->np_thread_state = ISCSI_NP_THREAD_RESET;
 421         atomic_inc(&np->np_reset_count);
 422
 423         if (np->np_thread) {
 424                 spin_unlock_bh(&np->np_thread_lock);
 425                 send_sig(SIGINT, np->np_thread, 1);
 426                 wait_for_completion(&np->np_restart_comp);
 427                 spin_lock_bh(&np->np_thread_lock);
 428         }
 429         spin_unlock_bh(&np->np_thread_lock);
 430
 431         if (tpg_np && shutdown) {
 432                 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
 433
 434                 wait_for_completion(&tpg_np->tpg_np_comp);
 435         }
 436
 437         return 0;
 438 }
 439
 440 static void iscsit_free_np(struct iscsi_np *np)
 441 {
 442         if (np->np_socket)
 443                 sock_release(np->np_socket);
 444 }
 445
 446 int iscsit_del_np(struct iscsi_np *np)
 447 {
 448         spin_lock_bh(&np->np_thread_lock);
 449         np->np_exports--;
 450         if (np->np_exports) {
 451                 np->enabled = true;
 452                 spin_unlock_bh(&np->np_thread_lock);
 453                 return 0;
 454         }
 455         np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
 456         spin_unlock_bh(&np->np_thread_lock);
 457
 458         if (np->np_thread) {
 459                 /*
 460                  * We need to send the signal to wakeup Linux/Net
 461                  * which may be sleeping in sock_accept()..
 462                  */
 463                 send_sig(SIGINT, np->np_thread, 1);
 464                 kthread_stop(np->np_thread);
 465                 np->np_thread = NULL;
 466         }
 467
 468         np->np_transport->iscsit_free_np(np);
 469
 470         mutex_lock(&np_lock);
 471         list_del(&np->np_list);
 472         mutex_unlock(&np_lock);
 473
 474         pr_debug("CORE[0] - Removed Network Portal: %pISpc on %s\n",
 475                 &np->np_sockaddr, np->np_transport->name);
 476
 477         iscsit_put_transport(np->np_transport);
 478         kfree(np);
 479         return 0;
 480 }
 481
 482 static int iscsit_immediate_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
 483 static int iscsit_response_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
 484
 485 static int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
 486 {
 487         iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
 488         return 0;
 489 }
 490
 491 static void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
 492 {
 493         bool scsi_cmd = (cmd->iscsi_opcode == ISCSI_OP_SCSI_CMD);
 494
 495         spin_lock_bh(&conn->cmd_lock);
 496         if (!list_empty(&cmd->i_conn_node))
 497                 list_del_init(&cmd->i_conn_node);
 498         spin_unlock_bh(&conn->cmd_lock);
 499
 500         __iscsit_free_cmd(cmd, scsi_cmd, true);
 501 }
 502
 503 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn)
 504 {
 505         return TARGET_PROT_NORMAL;
 506 }
 507
 508 static struct iscsit_transport iscsi_target_transport = {
 509         .name                   = "iSCSI/TCP",
 510         .transport_type         = ISCSI_TCP,
 511         .owner                  = NULL,
 512         .iscsit_setup_np        = iscsit_setup_np,
 513         .iscsit_accept_np       = iscsit_accept_np,
 514         .iscsit_free_np         = iscsit_free_np,
 515         .iscsit_get_login_rx    = iscsit_get_login_rx,
 516         .iscsit_put_login_tx    = iscsit_put_login_tx,
 517         .iscsit_get_dataout     = iscsit_build_r2ts_for_cmd,
 518         .iscsit_immediate_queue = iscsit_immediate_queue,
 519         .iscsit_response_queue  = iscsit_response_queue,
 520         .iscsit_queue_data_in   = iscsit_queue_rsp,
 521         .iscsit_queue_status    = iscsit_queue_rsp,
 522         .iscsit_aborted_task    = iscsit_aborted_task,
 523         .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops,
 524 };
 525
 526 static int __init iscsi_target_init_module(void)
 527 {
 528         int ret = 0, size;
 529
 530         pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
 531
 532         iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
 533         if (!iscsit_global) {
 534                 pr_err("Unable to allocate memory for iscsit_global\n");
 535                 return -1;
 536         }
 537         spin_lock_init(&iscsit_global->ts_bitmap_lock);
 538         mutex_init(&auth_id_lock);
 539         spin_lock_init(&sess_idr_lock);
 540         idr_init(&tiqn_idr);
 541         idr_init(&sess_idr);
 542
 543         ret = target_register_template(&iscsi_ops);
 544         if (ret)
 545                 goto out;
 546
 547         size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long);
 548         iscsit_global->ts_bitmap = vzalloc(size);
 549         if (!iscsit_global->ts_bitmap) {
 550                 pr_err("Unable to allocate iscsit_global->ts_bitmap\n");
 551                 goto configfs_out;
 552         }
 553
 554         lio_qr_cache = kmem_cache_create("lio_qr_cache",
 555                         sizeof(struct iscsi_queue_req),
 556                         __alignof__(struct iscsi_queue_req), 0, NULL);
 557         if (!lio_qr_cache) {
 558                 pr_err("nable to kmem_cache_create() for"
 559                                 " lio_qr_cache\n");
 560                 goto bitmap_out;
 561         }
 562
 563         lio_dr_cache = kmem_cache_create("lio_dr_cache",
 564                         sizeof(struct iscsi_datain_req),
 565                         __alignof__(struct iscsi_datain_req), 0, NULL);
 566         if (!lio_dr_cache) {
 567                 pr_err("Unable to kmem_cache_create() for"
 568                                 " lio_dr_cache\n");
 569                 goto qr_out;
 570         }
 571
 572         lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
 573                         sizeof(struct iscsi_ooo_cmdsn),
 574                         __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
 575         if (!lio_ooo_cache) {
 576                 pr_err("Unable to kmem_cache_create() for"
 577                                 " lio_ooo_cache\n");
 578                 goto dr_out;
 579         }
 580
 581         lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
 582                         sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
 583                         0, NULL);
 584         if (!lio_r2t_cache) {
 585                 pr_err("Unable to kmem_cache_create() for"
 586                                 " lio_r2t_cache\n");
 587                 goto ooo_out;
 588         }
 589
 590         iscsit_register_transport(&iscsi_target_transport);
 591
 592         if (iscsit_load_discovery_tpg() < 0)
 593                 goto r2t_out;
 594
 595         return ret;
 596 r2t_out:
 597         iscsit_unregister_transport(&iscsi_target_transport);
 598         kmem_cache_destroy(lio_r2t_cache);
 599 ooo_out:
 600         kmem_cache_destroy(lio_ooo_cache);
 601 dr_out:
 602         kmem_cache_destroy(lio_dr_cache);
 603 qr_out:
 604         kmem_cache_destroy(lio_qr_cache);
 605 bitmap_out:
 606         vfree(iscsit_global->ts_bitmap);
 607 configfs_out:
 608         /* XXX: this probably wants it to be it's own unwind step.. */
 609         if (iscsit_global->discovery_tpg)
 610                 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
 611         target_unregister_template(&iscsi_ops);
 612 out:
 613         kfree(iscsit_global);
 614         return -ENOMEM;
 615 }
 616
 617 static void __exit iscsi_target_cleanup_module(void)
 618 {
 619         iscsit_release_discovery_tpg();
 620         iscsit_unregister_transport(&iscsi_target_transport);
 621         kmem_cache_destroy(lio_qr_cache);
 622         kmem_cache_destroy(lio_dr_cache);
 623         kmem_cache_destroy(lio_ooo_cache);
 624         kmem_cache_destroy(lio_r2t_cache);
 625
 626         /*
 627          * Shutdown discovery sessions and disable discovery TPG
 628          */
 629         if (iscsit_global->discovery_tpg)
 630                 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
 631
 632         target_unregister_template(&iscsi_ops);
 633
 634         vfree(iscsit_global->ts_bitmap);
 635         kfree(iscsit_global);
 636 }
 637
 638 static int iscsit_add_reject(
 639         struct iscsi_conn *conn,
 640         u8 reason,
 641         unsigned char *buf)
 642 {
 643         struct iscsi_cmd *cmd;
 644
 645         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
 646         if (!cmd)
 647                 return -1;
 648
 649         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 650         cmd->reject_reason = reason;
 651
 652         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 653         if (!cmd->buf_ptr) {
 654                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 655                 iscsit_free_cmd(cmd, false);
 656                 return -1;
 657         }
 658
 659         spin_lock_bh(&conn->cmd_lock);
 660         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 661         spin_unlock_bh(&conn->cmd_lock);
 662
 663         cmd->i_state = ISTATE_SEND_REJECT;
 664         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 665
 666         return -1;
 667 }
 668
 669 static int iscsit_add_reject_from_cmd(
 670         struct iscsi_cmd *cmd,
 671         u8 reason,
 672         bool add_to_conn,
 673         unsigned char *buf)
 674 {
 675         struct iscsi_conn *conn;
 676         const bool do_put = cmd->se_cmd.se_tfo != NULL;
 677
 678         if (!cmd->conn) {
 679                 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
 680                                 cmd->init_task_tag);
 681                 return -1;
 682         }
 683         conn = cmd->conn;
 684
 685         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 686         cmd->reject_reason = reason;
 687
 688         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 689         if (!cmd->buf_ptr) {
 690                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 691                 iscsit_free_cmd(cmd, false);
 692                 return -1;
 693         }
 694
 695         if (add_to_conn) {
 696                 spin_lock_bh(&conn->cmd_lock);
 697                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 698                 spin_unlock_bh(&conn->cmd_lock);
 699         }
 700
 701         cmd->i_state = ISTATE_SEND_REJECT;
 702         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 703         /*
 704          * Perform the kref_put now if se_cmd has already been setup by
 705          * scsit_setup_scsi_cmd()
 706          */
 707         if (do_put) {
 708                 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
 709                 target_put_sess_cmd(&cmd->se_cmd);
 710         }
 711         return -1;
 712 }
 713
 714 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
 715                                  unsigned char *buf)
 716 {
 717         return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
 718 }
 719
 720 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
 721 {
 722         return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
 723 }
 724
 725 /*
 726  * Map some portion of the allocated scatterlist to an iovec, suitable for
 727  * kernel sockets to copy data in/out.
 728  */
 729 static int iscsit_map_iovec(
 730         struct iscsi_cmd *cmd,
 731         struct kvec *iov,
 732         u32 data_offset,
 733         u32 data_length)
 734 {
 735         u32 i = 0;
 736         struct scatterlist *sg;
 737         unsigned int page_off;
 738
 739         /*
 740          * We know each entry in t_data_sg contains a page.
 741          */
 742         sg = &cmd->se_cmd.t_data_sg[data_offset / PAGE_SIZE];
 743         page_off = (data_offset % PAGE_SIZE);
 744
 745         cmd->first_data_sg = sg;
 746         cmd->first_data_sg_off = page_off;
 747
 748         while (data_length) {
 749                 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
 750
 751                 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
 752                 iov[i].iov_len = cur_len;
 753
 754                 data_length -= cur_len;
 755                 page_off = 0;
 756                 sg = sg_next(sg);
 757                 i++;
 758         }
 759
 760         cmd->kmapped_nents = i;
 761
 762         return i;
 763 }
 764
 765 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
 766 {
 767         u32 i;
 768         struct scatterlist *sg;
 769
 770         sg = cmd->first_data_sg;
 771
 772         for (i = 0; i < cmd->kmapped_nents; i++)
 773                 kunmap(sg_page(&sg[i]));
 774 }
 775
 776 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
 777 {
 778         LIST_HEAD(ack_list);
 779         struct iscsi_cmd *cmd, *cmd_p;
 780
 781         conn->exp_statsn = exp_statsn;
 782
 783         if (conn->sess->sess_ops->RDMAExtensions)
 784                 return;
 785
 786         spin_lock_bh(&conn->cmd_lock);
 787         list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
 788                 spin_lock(&cmd->istate_lock);
 789                 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
 790                     iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
 791                         cmd->i_state = ISTATE_REMOVE;
 792                         spin_unlock(&cmd->istate_lock);
 793                         list_move_tail(&cmd->i_conn_node, &ack_list);
 794                         continue;
 795                 }
 796                 spin_unlock(&cmd->istate_lock);
 797         }
 798         spin_unlock_bh(&conn->cmd_lock);
 799
 800         list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
 801                 list_del_init(&cmd->i_conn_node);
 802                 iscsit_free_cmd(cmd, false);
 803         }
 804 }
 805
 806 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
 807 {
 808         u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
 809
 810         iov_count += ISCSI_IOV_DATA_BUFFER;
 811
 812         cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
 813         if (!cmd->iov_data) {
 814                 pr_err("Unable to allocate cmd->iov_data\n");
 815                 return -ENOMEM;
 816         }
 817
 818         cmd->orig_iov_data_count = iov_count;
 819         return 0;
 820 }
 821
 822 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 823                           unsigned char *buf)
 824 {
 825         int data_direction, payload_length;
 826         struct iscsi_scsi_req *hdr;
 827         int iscsi_task_attr;
 828         int sam_task_attr;
 829
 830         atomic_long_inc(&conn->sess->cmd_pdus);
 831
 832         hdr                     = (struct iscsi_scsi_req *) buf;
 833         payload_length          = ntoh24(hdr->dlength);
 834
 835         /* FIXME; Add checks for AdditionalHeaderSegment */
 836
 837         if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
 838             !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
 839                 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
 840                                 " not set. Bad iSCSI Initiator.\n");
 841                 return iscsit_add_reject_cmd(cmd,
 842                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 843         }
 844
 845         if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
 846              (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
 847                 /*
 848                  * From RFC-3720 Section 10.3.1:
 849                  *
 850                  * "Either or both of R and W MAY be 1 when either the
 851                  *  Expected Data Transfer Length and/or Bidirectional Read
 852                  *  Expected Data Transfer Length are 0"
 853                  *
 854                  * For this case, go ahead and clear the unnecssary bits
 855                  * to avoid any confusion with ->data_direction.
 856                  */
 857                 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
 858                 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
 859
 860                 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
 861                         " set when Expected Data Transfer Length is 0 for"
 862                         " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
 863         }
 864
 865         if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
 866             !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
 867                 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
 868                         " MUST be set if Expected Data Transfer Length is not 0."
 869                         " Bad iSCSI Initiator\n");
 870                 return iscsit_add_reject_cmd(cmd,
 871                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 872         }
 873
 874         if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
 875             (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
 876                 pr_err("Bidirectional operations not supported!\n");
 877                 return iscsit_add_reject_cmd(cmd,
 878                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 879         }
 880
 881         if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
 882                 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
 883                                 " Scsi Command PDU.\n");
 884                 return iscsit_add_reject_cmd(cmd,
 885                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 886         }
 887
 888         if (payload_length && !conn->sess->sess_ops->ImmediateData) {
 889                 pr_err("ImmediateData=No but DataSegmentLength=%u,"
 890                         " protocol error.\n", payload_length);
 891                 return iscsit_add_reject_cmd(cmd,
 892                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
 893         }
 894
 895         if ((be32_to_cpu(hdr->data_length) == payload_length) &&
 896             (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
 897                 pr_err("Expected Data Transfer Length and Length of"
 898                         " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
 899                         " bit is not set protocol error\n");
 900                 return iscsit_add_reject_cmd(cmd,
 901                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
 902         }
 903
 904         if (payload_length > be32_to_cpu(hdr->data_length)) {
 905                 pr_err("DataSegmentLength: %u is greater than"
 906                         " EDTL: %u, protocol error.\n", payload_length,
 907                                 hdr->data_length);
 908                 return iscsit_add_reject_cmd(cmd,
 909                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
 910         }
 911
 912         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
 913                 pr_err("DataSegmentLength: %u is greater than"
 914                         " MaxXmitDataSegmentLength: %u, protocol error.\n",
 915                         payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
 916                 return iscsit_add_reject_cmd(cmd,
 917                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
 918         }
 919
 920         if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
 921                 pr_err("DataSegmentLength: %u is greater than"
 922                         " FirstBurstLength: %u, protocol error.\n",
 923                         payload_length, conn->sess->sess_ops->FirstBurstLength);
 924                 return iscsit_add_reject_cmd(cmd,
 925                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 926         }
 927
 928         data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
 929                          (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
 930                           DMA_NONE;
 931
 932         cmd->data_direction = data_direction;
 933         iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
 934         /*
 935          * Figure out the SAM Task Attribute for the incoming SCSI CDB
 936          */
 937         if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
 938             (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
 939                 sam_task_attr = TCM_SIMPLE_TAG;
 940         else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
 941                 sam_task_attr = TCM_ORDERED_TAG;
 942         else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
 943                 sam_task_attr = TCM_HEAD_TAG;
 944         else if (iscsi_task_attr == ISCSI_ATTR_ACA)
 945                 sam_task_attr = TCM_ACA_TAG;
 946         else {
 947                 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
 948                         " TCM_SIMPLE_TAG\n", iscsi_task_attr);
 949                 sam_task_attr = TCM_SIMPLE_TAG;
 950         }
 951
 952         cmd->iscsi_opcode       = ISCSI_OP_SCSI_CMD;
 953         cmd->i_state            = ISTATE_NEW_CMD;
 954         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
 955         cmd->immediate_data     = (payload_length) ? 1 : 0;
 956         cmd->unsolicited_data   = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
 957                                      (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
 958         if (cmd->unsolicited_data)
 959                 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
 960
 961         conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
 962         if (hdr->flags & ISCSI_FLAG_CMD_READ)
 963                 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
 964         else
 965                 cmd->targ_xfer_tag = 0xFFFFFFFF;
 966         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
 967         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
 968         cmd->first_burst_len    = payload_length;
 969
 970         if (!conn->sess->sess_ops->RDMAExtensions &&
 971              cmd->data_direction == DMA_FROM_DEVICE) {
 972                 struct iscsi_datain_req *dr;
 973
 974                 dr = iscsit_allocate_datain_req();
 975                 if (!dr)
 976                         return iscsit_add_reject_cmd(cmd,
 977                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
 978
 979                 iscsit_attach_datain_req(cmd, dr);
 980         }
 981
 982         /*
 983          * Initialize struct se_cmd descriptor from target_core_mod infrastructure
 984          */
 985         transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
 986                         conn->sess->se_sess, be32_to_cpu(hdr->data_length),
 987                         cmd->data_direction, sam_task_attr,
 988                         cmd->sense_buffer + 2);
 989
 990         pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
 991                 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
 992                 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
 993                 conn->cid);
 994
 995         target_get_sess_cmd(&cmd->se_cmd, true);
 996
 997         cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
 998                                                      scsilun_to_int(&hdr->lun));
 999         if (cmd->sense_reason)
1000                 goto attach_cmd;
1001
1002         /* only used for printks or comparing with ->ref_task_tag */
1003         cmd->se_cmd.tag = (__force u32)cmd->init_task_tag;
1004         cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1005         if (cmd->sense_reason) {
1006                 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1007                         return iscsit_add_reject_cmd(cmd,
1008                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1009                 }
1010
1011                 goto attach_cmd;
1012         }
1013
1014         if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1015                 return iscsit_add_reject_cmd(cmd,
1016                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1017         }
1018
1019 attach_cmd:
1020         spin_lock_bh(&conn->cmd_lock);
1021         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1022         spin_unlock_bh(&conn->cmd_lock);
1023         /*
1024          * Check if we need to delay processing because of ALUA
1025          * Active/NonOptimized primary access state..
1026          */
1027         core_alua_check_nonop_delay(&cmd->se_cmd);
1028
1029         return 0;
1030 }
1031 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1032
1033 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1034 {
1035         iscsit_set_dataout_sequence_values(cmd);
1036
1037         spin_lock_bh(&cmd->dataout_timeout_lock);
1038         iscsit_start_dataout_timer(cmd, cmd->conn);
1039         spin_unlock_bh(&cmd->dataout_timeout_lock);
1040 }
1041 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1042
1043 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1044                             struct iscsi_scsi_req *hdr)
1045 {
1046         int cmdsn_ret = 0;
1047         /*
1048          * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1049          * the Immediate Bit is not set, and no Immediate
1050          * Data is attached.
1051          *
1052          * A PDU/CmdSN carrying Immediate Data can only
1053          * be processed after the DataCRC has passed.
1054          * If the DataCRC fails, the CmdSN MUST NOT
1055          * be acknowledged. (See below)
1056          */
1057         if (!cmd->immediate_data) {
1058                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1059                                         (unsigned char *)hdr, hdr->cmdsn);
1060                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1061                         return -1;
1062                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1063                         target_put_sess_cmd(&cmd->se_cmd);
1064                         return 0;
1065                 }
1066         }
1067
1068         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1069
1070         /*
1071          * If no Immediate Data is attached, it's OK to return now.
1072          */
1073         if (!cmd->immediate_data) {
1074                 if (!cmd->sense_reason && cmd->unsolicited_data)
1075                         iscsit_set_unsoliticed_dataout(cmd);
1076                 if (!cmd->sense_reason)
1077                         return 0;
1078
1079                 target_put_sess_cmd(&cmd->se_cmd);
1080                 return 0;
1081         }
1082
1083         /*
1084          * Early CHECK_CONDITIONs with ImmediateData never make it to command
1085          * execution.  These exceptions are processed in CmdSN order using
1086          * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1087          */
1088         if (cmd->sense_reason) {
1089                 if (cmd->reject_reason)
1090                         return 0;
1091
1092                 return 1;
1093         }
1094         /*
1095          * Call directly into transport_generic_new_cmd() to perform
1096          * the backend memory allocation.
1097          */
1098         cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1099         if (cmd->sense_reason)
1100                 return 1;
1101
1102         return 0;
1103 }
1104 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1105
1106 static int
1107 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1108                           bool dump_payload)
1109 {
1110         int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1111         /*
1112          * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1113          */
1114         if (dump_payload)
1115                 goto after_immediate_data;
1116         /*
1117          * Check for underflow case where both EDTL and immediate data payload
1118          * exceeds what is presented by CDB's TRANSFER LENGTH, and what has
1119          * already been set in target_cmd_size_check() as se_cmd->data_length.
1120          *
1121          * For this special case, fail the command and dump the immediate data
1122          * payload.
1123          */
1124         if (cmd->first_burst_len > cmd->se_cmd.data_length) {
1125                 cmd->sense_reason = TCM_INVALID_CDB_FIELD;
1126                 goto after_immediate_data;
1127         }
1128
1129         immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1130                                         cmd->first_burst_len);
1131 after_immediate_data:
1132         if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1133                 /*
1134                  * A PDU/CmdSN carrying Immediate Data passed
1135                  * DataCRC, check against ExpCmdSN/MaxCmdSN if
1136                  * Immediate Bit is not set.
1137                  */
1138                 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1139                                         (unsigned char *)hdr, hdr->cmdsn);
1140                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1141                         return -1;
1142
1143                 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1144                         int rc;
1145
1146                         rc = iscsit_dump_data_payload(cmd->conn,
1147                                                       cmd->first_burst_len, 1);
1148                         target_put_sess_cmd(&cmd->se_cmd);
1149                         return rc;
1150                 } else if (cmd->unsolicited_data)
1151                         iscsit_set_unsoliticed_dataout(cmd);
1152
1153         } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1154                 /*
1155                  * Immediate Data failed DataCRC and ERL>=1,
1156                  * silently drop this PDU and let the initiator
1157                  * plug the CmdSN gap.
1158                  *
1159                  * FIXME: Send Unsolicited NOPIN with reserved
1160                  * TTT here to help the initiator figure out
1161                  * the missing CmdSN, although they should be
1162                  * intelligent enough to determine the missing
1163                  * CmdSN and issue a retry to plug the sequence.
1164                  */
1165                 cmd->i_state = ISTATE_REMOVE;
1166                 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1167         } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1168                 return -1;
1169
1170         return 0;
1171 }
1172
1173 static int
1174 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1175                            unsigned char *buf)
1176 {
1177         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1178         int rc, immed_data;
1179         bool dump_payload = false;
1180
1181         rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1182         if (rc < 0)
1183                 return 0;
1184         /*
1185          * Allocation iovecs needed for struct socket operations for
1186          * traditional iSCSI block I/O.
1187          */
1188         if (iscsit_allocate_iovecs(cmd) < 0) {
1189                 return iscsit_reject_cmd(cmd,
1190                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1191         }
1192         immed_data = cmd->immediate_data;
1193
1194         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1195         if (rc < 0)
1196                 return rc;
1197         else if (rc > 0)
1198                 dump_payload = true;
1199
1200         if (!immed_data)
1201                 return 0;
1202
1203         return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1204 }
1205
1206 static u32 iscsit_do_crypto_hash_sg(
1207         struct hash_desc *hash,
1208         struct iscsi_cmd *cmd,
1209         u32 data_offset,
1210         u32 data_length,
1211         u32 padding,
1212         u8 *pad_bytes)
1213 {
1214         u32 data_crc;
1215         struct scatterlist *sg;
1216         unsigned int page_off;
1217
1218         crypto_hash_init(hash);
1219
1220         sg = cmd->first_data_sg;
1221         page_off = cmd->first_data_sg_off;
1222
1223         while (data_length) {
1224                 u32 cur_len = min_t(u32, data_length, (sg->length - page_off));
1225
1226                 crypto_hash_update(hash, sg, cur_len);
1227
1228                 data_length -= cur_len;
1229                 page_off = 0;
1230                 /* iscsit_map_iovec has already checked for invalid sg pointers */
1231                 sg = sg_next(sg);
1232         }
1233
1234         if (padding) {
1235                 struct scatterlist pad_sg;
1236
1237                 sg_init_one(&pad_sg, pad_bytes, padding);
1238                 crypto_hash_update(hash, &pad_sg, padding);
1239         }
1240         crypto_hash_final(hash, (u8 *) &data_crc);
1241
1242         return data_crc;
1243 }
1244
1245 static void iscsit_do_crypto_hash_buf(
1246         struct hash_desc *hash,
1247         const void *buf,
1248         u32 payload_length,
1249         u32 padding,
1250         u8 *pad_bytes,
1251         u8 *data_crc)
1252 {
1253         struct scatterlist sg;
1254
1255         crypto_hash_init(hash);
1256
1257         sg_init_one(&sg, buf, payload_length);
1258         crypto_hash_update(hash, &sg, payload_length);
1259
1260         if (padding) {
1261                 sg_init_one(&sg, pad_bytes, padding);
1262                 crypto_hash_update(hash, &sg, padding);
1263         }
1264         crypto_hash_final(hash, data_crc);
1265 }
1266
1267 int
1268 iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf,
1269                           struct iscsi_cmd **out_cmd)
1270 {
1271         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1272         struct iscsi_cmd *cmd = NULL;
1273         struct se_cmd *se_cmd;
1274         u32 payload_length = ntoh24(hdr->dlength);
1275         int rc;
1276
1277         if (!payload_length) {
1278                 pr_warn("DataOUT payload is ZERO, ignoring.\n");
1279                 return 0;
1280         }
1281
1282         /* iSCSI write */
1283         atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1284
1285         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1286                 pr_err("DataSegmentLength: %u is greater than"
1287                         " MaxXmitDataSegmentLength: %u\n", payload_length,
1288                         conn->conn_ops->MaxXmitDataSegmentLength);
1289                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1290                                          buf);
1291         }
1292
1293         cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1294                         payload_length);
1295         if (!cmd)
1296                 return 0;
1297
1298         pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1299                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1300                 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1301                 payload_length, conn->cid);
1302
1303         if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1304                 pr_err("Command ITT: 0x%08x received DataOUT after"
1305                         " last DataOUT received, dumping payload\n",
1306                         cmd->init_task_tag);
1307                 return iscsit_dump_data_payload(conn, payload_length, 1);
1308         }
1309
1310         if (cmd->data_direction != DMA_TO_DEVICE) {
1311                 pr_err("Command ITT: 0x%08x received DataOUT for a"
1312                         " NON-WRITE command.\n", cmd->init_task_tag);
1313                 return iscsit_dump_data_payload(conn, payload_length, 1);
1314         }
1315         se_cmd = &cmd->se_cmd;
1316         iscsit_mod_dataout_timer(cmd);
1317
1318         if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1319                 pr_err("DataOut Offset: %u, Length %u greater than"
1320                         " iSCSI Command EDTL %u, protocol error.\n",
1321                         hdr->offset, payload_length, cmd->se_cmd.data_length);
1322                 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1323         }
1324
1325         if (cmd->unsolicited_data) {
1326                 int dump_unsolicited_data = 0;
1327
1328                 if (conn->sess->sess_ops->InitialR2T) {
1329                         pr_err("Received unexpected unsolicited data"
1330                                 " while InitialR2T=Yes, protocol error.\n");
1331                         transport_send_check_condition_and_sense(&cmd->se_cmd,
1332                                         TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1333                         return -1;
1334                 }
1335                 /*
1336                  * Special case for dealing with Unsolicited DataOUT
1337                  * and Unsupported SAM WRITE Opcodes and SE resource allocation
1338                  * failures;
1339                  */
1340
1341                 /* Something's amiss if we're not in WRITE_PENDING state... */
1342                 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1343                 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1344                         dump_unsolicited_data = 1;
1345
1346                 if (dump_unsolicited_data) {
1347                         /*
1348                          * Check if a delayed TASK_ABORTED status needs to
1349                          * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1350                          * received with the unsolicitied data out.
1351                          */
1352                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1353                                 iscsit_stop_dataout_timer(cmd);
1354
1355                         transport_check_aborted_status(se_cmd,
1356                                         (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1357                         return iscsit_dump_data_payload(conn, payload_length, 1);
1358                 }
1359         } else {
1360                 /*
1361                  * For the normal solicited data path:
1362                  *
1363                  * Check for a delayed TASK_ABORTED status and dump any
1364                  * incoming data out payload if one exists.  Also, when the
1365                  * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1366                  * data out sequence, we decrement outstanding_r2ts.  Once
1367                  * outstanding_r2ts reaches zero, go ahead and send the delayed
1368                  * TASK_ABORTED status.
1369                  */
1370                 if (se_cmd->transport_state & CMD_T_ABORTED) {
1371                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1372                                 if (--cmd->outstanding_r2ts < 1) {
1373                                         iscsit_stop_dataout_timer(cmd);
1374                                         transport_check_aborted_status(
1375                                                         se_cmd, 1);
1376                                 }
1377
1378                         return iscsit_dump_data_payload(conn, payload_length, 1);
1379                 }
1380         }
1381         /*
1382          * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1383          * within-command recovery checks before receiving the payload.
1384          */
1385         rc = iscsit_check_pre_dataout(cmd, buf);
1386         if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1387                 return 0;
1388         else if (rc == DATAOUT_CANNOT_RECOVER)
1389                 return -1;
1390
1391         *out_cmd = cmd;
1392         return 0;
1393 }
1394 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1395
1396 static int
1397 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1398                    struct iscsi_data *hdr)
1399 {
1400         struct kvec *iov;
1401         u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1402         u32 payload_length = ntoh24(hdr->dlength);
1403         int iov_ret, data_crc_failed = 0;
1404
1405         rx_size += payload_length;
1406         iov = &cmd->iov_data[0];
1407
1408         iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1409                                    payload_length);
1410         if (iov_ret < 0)
1411                 return -1;
1412
1413         iov_count += iov_ret;
1414
1415         padding = ((-payload_length) & 3);
1416         if (padding != 0) {
1417                 iov[iov_count].iov_base = cmd->pad_bytes;
1418                 iov[iov_count++].iov_len = padding;
1419                 rx_size += padding;
1420                 pr_debug("Receiving %u padding bytes.\n", padding);
1421         }
1422
1423         if (conn->conn_ops->DataDigest) {
1424                 iov[iov_count].iov_base = &checksum;
1425                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1426                 rx_size += ISCSI_CRC_LEN;
1427         }
1428
1429         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1430
1431         iscsit_unmap_iovec(cmd);
1432
1433         if (rx_got != rx_size)
1434                 return -1;
1435
1436         if (conn->conn_ops->DataDigest) {
1437                 u32 data_crc;
1438
1439                 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
1440                                                     be32_to_cpu(hdr->offset),
1441                                                     payload_length, padding,
1442                                                     cmd->pad_bytes);
1443
1444                 if (checksum != data_crc) {
1445                         pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1446                                 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1447                                 " does not match computed 0x%08x\n",
1448                                 hdr->itt, hdr->offset, payload_length,
1449                                 hdr->datasn, checksum, data_crc);
1450                         data_crc_failed = 1;
1451                 } else {
1452                         pr_debug("Got CRC32C DataDigest 0x%08x for"
1453                                 " %u bytes of Data Out\n", checksum,
1454                                 payload_length);
1455                 }
1456         }
1457
1458         return data_crc_failed;
1459 }
1460
1461 int
1462 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1463                              bool data_crc_failed)
1464 {
1465         struct iscsi_conn *conn = cmd->conn;
1466         int rc, ooo_cmdsn;
1467         /*
1468          * Increment post receive data and CRC values or perform
1469          * within-command recovery.
1470          */
1471         rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1472         if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1473                 return 0;
1474         else if (rc == DATAOUT_SEND_R2T) {
1475                 iscsit_set_dataout_sequence_values(cmd);
1476                 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1477         } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1478                 /*
1479                  * Handle extra special case for out of order
1480                  * Unsolicited Data Out.
1481                  */
1482                 spin_lock_bh(&cmd->istate_lock);
1483                 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1484                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1485                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1486                 spin_unlock_bh(&cmd->istate_lock);
1487
1488                 iscsit_stop_dataout_timer(cmd);
1489                 if (ooo_cmdsn)
1490                         return 0;
1491                 target_execute_cmd(&cmd->se_cmd);
1492                 return 0;
1493         } else /* DATAOUT_CANNOT_RECOVER */
1494                 return -1;
1495
1496         return 0;
1497 }
1498 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1499
1500 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1501 {
1502         struct iscsi_cmd *cmd = NULL;
1503         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1504         int rc;
1505         bool data_crc_failed = false;
1506
1507         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1508         if (rc < 0)
1509                 return 0;
1510         else if (!cmd)
1511                 return 0;
1512
1513         rc = iscsit_get_dataout(conn, cmd, hdr);
1514         if (rc < 0)
1515                 return rc;
1516         else if (rc > 0)
1517                 data_crc_failed = true;
1518
1519         return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1520 }
1521
1522 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1523                          struct iscsi_nopout *hdr)
1524 {
1525         u32 payload_length = ntoh24(hdr->dlength);
1526
1527         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1528                 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1529                 if (!cmd)
1530                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1531                                                  (unsigned char *)hdr);
1532
1533                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1534                                          (unsigned char *)hdr);
1535         }
1536
1537         if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1538                 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1539                         " not set, protocol error.\n");
1540                 if (!cmd)
1541                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1542                                                  (unsigned char *)hdr);
1543
1544                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1545                                          (unsigned char *)hdr);
1546         }
1547
1548         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1549                 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1550                         " greater than MaxXmitDataSegmentLength: %u, protocol"
1551                         " error.\n", payload_length,
1552                         conn->conn_ops->MaxXmitDataSegmentLength);
1553                 if (!cmd)
1554                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1555                                                  (unsigned char *)hdr);
1556
1557                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1558                                          (unsigned char *)hdr);
1559         }
1560
1561         pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1562                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1563                 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1564                 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1565                 payload_length);
1566         /*
1567          * This is not a response to a Unsolicited NopIN, which means
1568          * it can either be a NOPOUT ping request (with a valid ITT),
1569          * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1570          * Either way, make sure we allocate an struct iscsi_cmd, as both
1571          * can contain ping data.
1572          */
1573         if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1574                 cmd->iscsi_opcode       = ISCSI_OP_NOOP_OUT;
1575                 cmd->i_state            = ISTATE_SEND_NOPIN;
1576                 cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1577                                                 1 : 0);
1578                 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1579                 cmd->targ_xfer_tag      = 0xFFFFFFFF;
1580                 cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1581                 cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1582                 cmd->data_direction     = DMA_NONE;
1583         }
1584
1585         return 0;
1586 }
1587 EXPORT_SYMBOL(iscsit_setup_nop_out);
1588
1589 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1590                            struct iscsi_nopout *hdr)
1591 {
1592         struct iscsi_cmd *cmd_p = NULL;
1593         int cmdsn_ret = 0;
1594         /*
1595          * Initiator is expecting a NopIN ping reply..
1596          */
1597         if (hdr->itt != RESERVED_ITT) {
1598                 if (!cmd)
1599                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1600                                                 (unsigned char *)hdr);
1601
1602                 spin_lock_bh(&conn->cmd_lock);
1603                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1604                 spin_unlock_bh(&conn->cmd_lock);
1605
1606                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1607
1608                 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1609                         iscsit_add_cmd_to_response_queue(cmd, conn,
1610                                                          cmd->i_state);
1611                         return 0;
1612                 }
1613
1614                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1615                                 (unsigned char *)hdr, hdr->cmdsn);
1616                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1617                         return 0;
1618                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1619                         return -1;
1620
1621                 return 0;
1622         }
1623         /*
1624          * This was a response to a unsolicited NOPIN ping.
1625          */
1626         if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1627                 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1628                 if (!cmd_p)
1629                         return -EINVAL;
1630
1631                 iscsit_stop_nopin_response_timer(conn);
1632
1633                 cmd_p->i_state = ISTATE_REMOVE;
1634                 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1635
1636                 iscsit_start_nopin_timer(conn);
1637                 return 0;
1638         }
1639         /*
1640          * Otherwise, initiator is not expecting a NOPIN is response.
1641          * Just ignore for now.
1642          */
1643         return 0;
1644 }
1645 EXPORT_SYMBOL(iscsit_process_nop_out);
1646
1647 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1648                                  unsigned char *buf)
1649 {
1650         unsigned char *ping_data = NULL;
1651         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1652         struct kvec *iov = NULL;
1653         u32 payload_length = ntoh24(hdr->dlength);
1654         int ret;
1655
1656         ret = iscsit_setup_nop_out(conn, cmd, hdr);
1657         if (ret < 0)
1658                 return 0;
1659         /*
1660          * Handle NOP-OUT payload for traditional iSCSI sockets
1661          */
1662         if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1663                 u32 checksum, data_crc, padding = 0;
1664                 int niov = 0, rx_got, rx_size = payload_length;
1665
1666                 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1667                 if (!ping_data) {
1668                         pr_err("Unable to allocate memory for"
1669                                 " NOPOUT ping data.\n");
1670                         ret = -1;
1671                         goto out;
1672                 }
1673
1674                 iov = &cmd->iov_misc[0];
1675                 iov[niov].iov_base      = ping_data;
1676                 iov[niov++].iov_len     = payload_length;
1677
1678                 padding = ((-payload_length) & 3);
1679                 if (padding != 0) {
1680                         pr_debug("Receiving %u additional bytes"
1681                                 " for padding.\n", padding);
1682                         iov[niov].iov_base      = &cmd->pad_bytes;
1683                         iov[niov++].iov_len     = padding;
1684                         rx_size += padding;
1685                 }
1686                 if (conn->conn_ops->DataDigest) {
1687                         iov[niov].iov_base      = &checksum;
1688                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
1689                         rx_size += ISCSI_CRC_LEN;
1690                 }
1691
1692                 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1693                 if (rx_got != rx_size) {
1694                         ret = -1;
1695                         goto out;
1696                 }
1697
1698                 if (conn->conn_ops->DataDigest) {
1699                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1700                                         ping_data, payload_length,
1701                                         padding, cmd->pad_bytes,
1702                                         (u8 *)&data_crc);
1703
1704                         if (checksum != data_crc) {
1705                                 pr_err("Ping data CRC32C DataDigest"
1706                                 " 0x%08x does not match computed 0x%08x\n",
1707                                         checksum, data_crc);
1708                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1709                                         pr_err("Unable to recover from"
1710                                         " NOPOUT Ping DataCRC failure while in"
1711                                                 " ERL=0.\n");
1712                                         ret = -1;
1713                                         goto out;
1714                                 } else {
1715                                         /*
1716                                          * Silently drop this PDU and let the
1717                                          * initiator plug the CmdSN gap.
1718                                          */
1719                                         pr_debug("Dropping NOPOUT"
1720                                         " Command CmdSN: 0x%08x due to"
1721                                         " DataCRC error.\n", hdr->cmdsn);
1722                                         ret = 0;
1723                                         goto out;
1724                                 }
1725                         } else {
1726                                 pr_debug("Got CRC32C DataDigest"
1727                                 " 0x%08x for %u bytes of ping data.\n",
1728                                         checksum, payload_length);
1729                         }
1730                 }
1731
1732                 ping_data[payload_length] = '\0';
1733                 /*
1734                  * Attach ping data to struct iscsi_cmd->buf_ptr.
1735                  */
1736                 cmd->buf_ptr = ping_data;
1737                 cmd->buf_ptr_size = payload_length;
1738
1739                 pr_debug("Got %u bytes of NOPOUT ping"
1740                         " data.\n", payload_length);
1741                 pr_debug("Ping Data: \"%s\"\n", ping_data);
1742         }
1743
1744         return iscsit_process_nop_out(conn, cmd, hdr);
1745 out:
1746         if (cmd)
1747                 iscsit_free_cmd(cmd, false);
1748
1749         kfree(ping_data);
1750         return ret;
1751 }
1752
1753 int
1754 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1755                            unsigned char *buf)
1756 {
1757         struct se_tmr_req *se_tmr;
1758         struct iscsi_tmr_req *tmr_req;
1759         struct iscsi_tm *hdr;
1760         int out_of_order_cmdsn = 0, ret;
1761         u8 function, tcm_function = TMR_UNKNOWN;
1762
1763         hdr                     = (struct iscsi_tm *) buf;
1764         hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1765         function = hdr->flags;
1766
1767         pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1768                 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1769                 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1770                 hdr->rtt, hdr->refcmdsn, conn->cid);
1771
1772         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1773             ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1774              hdr->rtt != RESERVED_ITT)) {
1775                 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1776                 hdr->rtt = RESERVED_ITT;
1777         }
1778
1779         if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1780                         !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1781                 pr_err("Task Management Request TASK_REASSIGN not"
1782                         " issued as immediate command, bad iSCSI Initiator"
1783                                 "implementation\n");
1784                 return iscsit_add_reject_cmd(cmd,
1785                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1786         }
1787         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1788             be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1789                 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1790
1791         cmd->data_direction = DMA_NONE;
1792
1793         cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1794         if (!cmd->tmr_req) {
1795                 pr_err("Unable to allocate memory for"
1796                         " Task Management command!\n");
1797                 return iscsit_add_reject_cmd(cmd,
1798                                              ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1799                                              buf);
1800         }
1801
1802         transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1803                               conn->sess->se_sess, 0, DMA_NONE,
1804                               TCM_SIMPLE_TAG, cmd->sense_buffer + 2);
1805
1806         target_get_sess_cmd(&cmd->se_cmd, true);
1807
1808         /*
1809          * TASK_REASSIGN for ERL=2 / connection stays inside of
1810          * LIO-Target $FABRIC_MOD
1811          */
1812         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1813                 switch (function) {
1814                 case ISCSI_TM_FUNC_ABORT_TASK:
1815                         tcm_function = TMR_ABORT_TASK;
1816                         break;
1817                 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1818                         tcm_function = TMR_ABORT_TASK_SET;
1819                         break;
1820                 case ISCSI_TM_FUNC_CLEAR_ACA:
1821                         tcm_function = TMR_CLEAR_ACA;
1822                         break;
1823                 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1824                         tcm_function = TMR_CLEAR_TASK_SET;
1825                         break;
1826                 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1827                         tcm_function = TMR_LUN_RESET;
1828                         break;
1829                 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1830                         tcm_function = TMR_TARGET_WARM_RESET;
1831                         break;
1832                 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1833                         tcm_function = TMR_TARGET_COLD_RESET;
1834                         break;
1835                 default:
1836                         pr_err("Unknown iSCSI TMR Function:"
1837                                " 0x%02x\n", function);
1838                         return iscsit_add_reject_cmd(cmd,
1839                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1840                 }
1841         }
1842         ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function,
1843                                  GFP_KERNEL);
1844         if (ret < 0)
1845                 return iscsit_add_reject_cmd(cmd,
1846                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1847
1848         cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
1849
1850         cmd->iscsi_opcode       = ISCSI_OP_SCSI_TMFUNC;
1851         cmd->i_state            = ISTATE_SEND_TASKMGTRSP;
1852         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1853         cmd->init_task_tag      = hdr->itt;
1854         cmd->targ_xfer_tag      = 0xFFFFFFFF;
1855         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1856         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1857         se_tmr                  = cmd->se_cmd.se_tmr_req;
1858         tmr_req                 = cmd->tmr_req;
1859         /*
1860          * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1861          */
1862         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1863                 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
1864                                                scsilun_to_int(&hdr->lun));
1865                 if (ret < 0) {
1866                         se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1867                         goto attach;
1868                 }
1869         }
1870
1871         switch (function) {
1872         case ISCSI_TM_FUNC_ABORT_TASK:
1873                 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
1874                 if (se_tmr->response)
1875                         goto attach;
1876                 break;
1877         case ISCSI_TM_FUNC_ABORT_TASK_SET:
1878         case ISCSI_TM_FUNC_CLEAR_ACA:
1879         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1880         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1881                 break;
1882         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1883                 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
1884                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1885                         goto attach;
1886                 }
1887                 break;
1888         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1889                 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
1890                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1891                         goto attach;
1892                 }
1893                 break;
1894         case ISCSI_TM_FUNC_TASK_REASSIGN:
1895                 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1896                 /*
1897                  * Perform sanity checks on the ExpDataSN only if the
1898                  * TASK_REASSIGN was successful.
1899                  */
1900                 if (se_tmr->response)
1901                         break;
1902
1903                 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1904                         return iscsit_add_reject_cmd(cmd,
1905                                         ISCSI_REASON_BOOKMARK_INVALID, buf);
1906                 break;
1907         default:
1908                 pr_err("Unknown TMR function: 0x%02x, protocol"
1909                         " error.\n", function);
1910                 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1911                 goto attach;
1912         }
1913
1914         if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1915             (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1916                 se_tmr->call_transport = 1;
1917 attach:
1918         spin_lock_bh(&conn->cmd_lock);
1919         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1920         spin_unlock_bh(&conn->cmd_lock);
1921
1922         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1923                 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1924                 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP) {
1925                         out_of_order_cmdsn = 1;
1926                 } else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1927                         target_put_sess_cmd(&cmd->se_cmd);
1928                         return 0;
1929                 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
1930                         return -1;
1931                 }
1932         }
1933         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1934
1935         if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
1936                 return 0;
1937         /*
1938          * Found the referenced task, send to transport for processing.
1939          */
1940         if (se_tmr->call_transport)
1941                 return transport_generic_handle_tmr(&cmd->se_cmd);
1942
1943         /*
1944          * Could not find the referenced LUN, task, or Task Management
1945          * command not authorized or supported.  Change state and
1946          * let the tx_thread send the response.
1947          *
1948          * For connection recovery, this is also the default action for
1949          * TMR TASK_REASSIGN.
1950          */
1951         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1952         target_put_sess_cmd(&cmd->se_cmd);
1953         return 0;
1954 }
1955 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
1956
1957 /* #warning FIXME: Support Text Command parameters besides SendTargets */
1958 int
1959 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1960                       struct iscsi_text *hdr)
1961 {
1962         u32 payload_length = ntoh24(hdr->dlength);
1963
1964         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1965                 pr_err("Unable to accept text parameter length: %u"
1966                         "greater than MaxXmitDataSegmentLength %u.\n",
1967                        payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1968                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1969                                          (unsigned char *)hdr);
1970         }
1971
1972         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
1973              (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
1974                 pr_err("Multi sequence text commands currently not supported\n");
1975                 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
1976                                         (unsigned char *)hdr);
1977         }
1978
1979         pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1980                 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1981                 hdr->exp_statsn, payload_length);
1982
1983         cmd->iscsi_opcode       = ISCSI_OP_TEXT;
1984         cmd->i_state            = ISTATE_SEND_TEXTRSP;
1985         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1986         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
1987         cmd->targ_xfer_tag      = 0xFFFFFFFF;
1988         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1989         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1990         cmd->data_direction     = DMA_NONE;
1991         kfree(cmd->text_in_ptr);
1992         cmd->text_in_ptr        = NULL;
1993
1994         return 0;
1995 }
1996 EXPORT_SYMBOL(iscsit_setup_text_cmd);
1997
1998 int
1999 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2000                         struct iscsi_text *hdr)
2001 {
2002         unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2003         int cmdsn_ret;
2004
2005         if (!text_in) {
2006                 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2007                 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2008                         pr_err("Unable to locate text_in buffer for sendtargets"
2009                                " discovery\n");
2010                         goto reject;
2011                 }
2012                 goto empty_sendtargets;
2013         }
2014         if (strncmp("SendTargets", text_in, 11) != 0) {
2015                 pr_err("Received Text Data that is not"
2016                         " SendTargets, cannot continue.\n");
2017                 goto reject;
2018         }
2019         text_ptr = strchr(text_in, '=');
2020         if (!text_ptr) {
2021                 pr_err("No \"=\" separator found in Text Data,"
2022                         "  cannot continue.\n");
2023                 goto reject;
2024         }
2025         if (!strncmp("=All", text_ptr, 4)) {
2026                 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2027         } else if (!strncmp("=iqn.", text_ptr, 5) ||
2028                    !strncmp("=eui.", text_ptr, 5)) {
2029                 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2030         } else {
2031                 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2032                 goto reject;
2033         }
2034
2035         spin_lock_bh(&conn->cmd_lock);
2036         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2037         spin_unlock_bh(&conn->cmd_lock);
2038
2039 empty_sendtargets:
2040         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2041
2042         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2043                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2044                                 (unsigned char *)hdr, hdr->cmdsn);
2045                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2046                         return -1;
2047
2048                 return 0;
2049         }
2050
2051         return iscsit_execute_cmd(cmd, 0);
2052
2053 reject:
2054         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2055                                  (unsigned char *)hdr);
2056 }
2057 EXPORT_SYMBOL(iscsit_process_text_cmd);
2058
2059 static int
2060 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2061                        unsigned char *buf)
2062 {
2063         struct iscsi_text *hdr = (struct iscsi_text *)buf;
2064         char *text_in = NULL;
2065         u32 payload_length = ntoh24(hdr->dlength);
2066         int rx_size, rc;
2067
2068         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2069         if (rc < 0)
2070                 return 0;
2071
2072         rx_size = payload_length;
2073         if (payload_length) {
2074                 u32 checksum = 0, data_crc = 0;
2075                 u32 padding = 0, pad_bytes = 0;
2076                 int niov = 0, rx_got;
2077                 struct kvec iov[3];
2078
2079                 text_in = kzalloc(payload_length, GFP_KERNEL);
2080                 if (!text_in) {
2081                         pr_err("Unable to allocate memory for"
2082                                 " incoming text parameters\n");
2083                         goto reject;
2084                 }
2085                 cmd->text_in_ptr = text_in;
2086
2087                 memset(iov, 0, 3 * sizeof(struct kvec));
2088                 iov[niov].iov_base      = text_in;
2089                 iov[niov++].iov_len     = payload_length;
2090
2091                 padding = ((-payload_length) & 3);
2092                 if (padding != 0) {
2093                         iov[niov].iov_base = &pad_bytes;
2094                         iov[niov++].iov_len  = padding;
2095                         rx_size += padding;
2096                         pr_debug("Receiving %u additional bytes"
2097                                         " for padding.\n", padding);
2098                 }
2099                 if (conn->conn_ops->DataDigest) {
2100                         iov[niov].iov_base      = &checksum;
2101                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
2102                         rx_size += ISCSI_CRC_LEN;
2103                 }
2104
2105                 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2106                 if (rx_got != rx_size)
2107                         goto reject;
2108
2109                 if (conn->conn_ops->DataDigest) {
2110                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
2111                                         text_in, payload_length,
2112                                         padding, (u8 *)&pad_bytes,
2113                                         (u8 *)&data_crc);
2114
2115                         if (checksum != data_crc) {
2116                                 pr_err("Text data CRC32C DataDigest"
2117                                         " 0x%08x does not match computed"
2118                                         " 0x%08x\n", checksum, data_crc);
2119                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2120                                         pr_err("Unable to recover from"
2121                                         " Text Data digest failure while in"
2122                                                 " ERL=0.\n");
2123                                         goto reject;
2124                                 } else {
2125                                         /*
2126                                          * Silently drop this PDU and let the
2127                                          * initiator plug the CmdSN gap.
2128                                          */
2129                                         pr_debug("Dropping Text"
2130                                         " Command CmdSN: 0x%08x due to"
2131                                         " DataCRC error.\n", hdr->cmdsn);
2132                                         kfree(text_in);
2133                                         return 0;
2134                                 }
2135                         } else {
2136                                 pr_debug("Got CRC32C DataDigest"
2137                                         " 0x%08x for %u bytes of text data.\n",
2138                                                 checksum, payload_length);
2139                         }
2140                 }
2141                 text_in[payload_length - 1] = '\0';
2142                 pr_debug("Successfully read %d bytes of text"
2143                                 " data.\n", payload_length);
2144         }
2145
2146         return iscsit_process_text_cmd(conn, cmd, hdr);
2147
2148 reject:
2149         kfree(cmd->text_in_ptr);
2150         cmd->text_in_ptr = NULL;
2151         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2152 }
2153
2154 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2155 {
2156         struct iscsi_conn *conn_p;
2157         struct iscsi_session *sess = conn->sess;
2158
2159         pr_debug("Received logout request CLOSESESSION on CID: %hu"
2160                 " for SID: %u.\n", conn->cid, conn->sess->sid);
2161
2162         atomic_set(&sess->session_logout, 1);
2163         atomic_set(&conn->conn_logout_remove, 1);
2164         conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2165
2166         iscsit_inc_conn_usage_count(conn);
2167         iscsit_inc_session_usage_count(sess);
2168
2169         spin_lock_bh(&sess->conn_lock);
2170         list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2171                 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2172                         continue;
2173
2174                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2175                 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2176         }
2177         spin_unlock_bh(&sess->conn_lock);
2178
2179         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2180
2181         return 0;
2182 }
2183
2184 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2185 {
2186         struct iscsi_conn *l_conn;
2187         struct iscsi_session *sess = conn->sess;
2188
2189         pr_debug("Received logout request CLOSECONNECTION for CID:"
2190                 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2191
2192         /*
2193          * A Logout Request with a CLOSECONNECTION reason code for a CID
2194          * can arrive on a connection with a differing CID.
2195          */
2196         if (conn->cid == cmd->logout_cid) {
2197                 spin_lock_bh(&conn->state_lock);
2198                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2199                 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2200
2201                 atomic_set(&conn->conn_logout_remove, 1);
2202                 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2203                 iscsit_inc_conn_usage_count(conn);
2204
2205                 spin_unlock_bh(&conn->state_lock);
2206         } else {
2207                 /*
2208                  * Handle all different cid CLOSECONNECTION requests in
2209                  * iscsit_logout_post_handler_diffcid() as to give enough
2210                  * time for any non immediate command's CmdSN to be
2211                  * acknowledged on the connection in question.
2212                  *
2213                  * Here we simply make sure the CID is still around.
2214                  */
2215                 l_conn = iscsit_get_conn_from_cid(sess,
2216                                 cmd->logout_cid);
2217                 if (!l_conn) {
2218                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2219                         iscsit_add_cmd_to_response_queue(cmd, conn,
2220                                         cmd->i_state);
2221                         return 0;
2222                 }
2223
2224                 iscsit_dec_conn_usage_count(l_conn);
2225         }
2226
2227         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2228
2229         return 0;
2230 }
2231
2232 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2233 {
2234         struct iscsi_session *sess = conn->sess;
2235
2236         pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2237                 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2238
2239         if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2240                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2241                         " while ERL!=2.\n");
2242                 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2243                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2244                 return 0;
2245         }
2246
2247         if (conn->cid == cmd->logout_cid) {
2248                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2249                         " with CID: %hu on CID: %hu, implementation error.\n",
2250                                 cmd->logout_cid, conn->cid);
2251                 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2252                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2253                 return 0;
2254         }
2255
2256         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2257
2258         return 0;
2259 }
2260
2261 int
2262 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2263                         unsigned char *buf)
2264 {
2265         int cmdsn_ret, logout_remove = 0;
2266         u8 reason_code = 0;
2267         struct iscsi_logout *hdr;
2268         struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2269
2270         hdr                     = (struct iscsi_logout *) buf;
2271         reason_code             = (hdr->flags & 0x7f);
2272
2273         if (tiqn) {
2274                 spin_lock(&tiqn->logout_stats.lock);
2275                 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2276                         tiqn->logout_stats.normal_logouts++;
2277                 else
2278                         tiqn->logout_stats.abnormal_logouts++;
2279                 spin_unlock(&tiqn->logout_stats.lock);
2280         }
2281
2282         pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2283                 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2284                 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2285                 hdr->cid, conn->cid);
2286
2287         if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2288                 pr_err("Received logout request on connection that"
2289                         " is not in logged in state, ignoring request.\n");
2290                 iscsit_free_cmd(cmd, false);
2291                 return 0;
2292         }
2293
2294         cmd->iscsi_opcode       = ISCSI_OP_LOGOUT;
2295         cmd->i_state            = ISTATE_SEND_LOGOUTRSP;
2296         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2297         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2298         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2299         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2300         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2301         cmd->logout_cid         = be16_to_cpu(hdr->cid);
2302         cmd->logout_reason      = reason_code;
2303         cmd->data_direction     = DMA_NONE;
2304
2305         /*
2306          * We need to sleep in these cases (by returning 1) until the Logout
2307          * Response gets sent in the tx thread.
2308          */
2309         if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2310            ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2311             be16_to_cpu(hdr->cid) == conn->cid))
2312                 logout_remove = 1;
2313
2314         spin_lock_bh(&conn->cmd_lock);
2315         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2316         spin_unlock_bh(&conn->cmd_lock);
2317
2318         if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2319                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2320
2321         /*
2322          * Immediate commands are executed, well, immediately.
2323          * Non-Immediate Logout Commands are executed in CmdSN order.
2324          */
2325         if (cmd->immediate_cmd) {
2326                 int ret = iscsit_execute_cmd(cmd, 0);
2327
2328                 if (ret < 0)
2329                         return ret;
2330         } else {
2331                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2332                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2333                         logout_remove = 0;
2334                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2335                         return -1;
2336         }
2337
2338         return logout_remove;
2339 }
2340 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2341
2342 static int iscsit_handle_snack(
2343         struct iscsi_conn *conn,
2344         unsigned char *buf)
2345 {
2346         struct iscsi_snack *hdr;
2347
2348         hdr                     = (struct iscsi_snack *) buf;
2349         hdr->flags              &= ~ISCSI_FLAG_CMD_FINAL;
2350
2351         pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2352                 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2353                 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2354                         hdr->begrun, hdr->runlength, conn->cid);
2355
2356         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2357                 pr_err("Initiator sent SNACK request while in"
2358                         " ErrorRecoveryLevel=0.\n");
2359                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2360                                          buf);
2361         }
2362         /*
2363          * SNACK_DATA and SNACK_R2T are both 0,  so check which function to
2364          * call from inside iscsi_send_recovery_datain_or_r2t().
2365          */
2366         switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2367         case 0:
2368                 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2369                         hdr->itt,
2370                         be32_to_cpu(hdr->ttt),
2371                         be32_to_cpu(hdr->begrun),
2372                         be32_to_cpu(hdr->runlength));
2373         case ISCSI_FLAG_SNACK_TYPE_STATUS:
2374                 return iscsit_handle_status_snack(conn, hdr->itt,
2375                         be32_to_cpu(hdr->ttt),
2376                         be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2377         case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2378                 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2379                         be32_to_cpu(hdr->begrun),
2380                         be32_to_cpu(hdr->runlength));
2381         case ISCSI_FLAG_SNACK_TYPE_RDATA:
2382                 /* FIXME: Support R-Data SNACK */
2383                 pr_err("R-Data SNACK Not Supported.\n");
2384                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2385                                          buf);
2386         default:
2387                 pr_err("Unknown SNACK type 0x%02x, protocol"
2388                         " error.\n", hdr->flags & 0x0f);
2389                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2390                                          buf);
2391         }
2392
2393         return 0;
2394 }
2395
2396 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2397 {
2398         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2399             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2400                 wait_for_completion_interruptible_timeout(
2401                                         &conn->rx_half_close_comp,
2402                                         ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2403         }
2404 }
2405
2406 static int iscsit_handle_immediate_data(
2407         struct iscsi_cmd *cmd,
2408         struct iscsi_scsi_req *hdr,
2409         u32 length)
2410 {
2411         int iov_ret, rx_got = 0, rx_size = 0;
2412         u32 checksum, iov_count = 0, padding = 0;
2413         struct iscsi_conn *conn = cmd->conn;
2414         struct kvec *iov;
2415
2416         iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2417         if (iov_ret < 0)
2418                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2419
2420         rx_size = length;
2421         iov_count = iov_ret;
2422         iov = &cmd->iov_data[0];
2423
2424         padding = ((-length) & 3);
2425         if (padding != 0) {
2426                 iov[iov_count].iov_base = cmd->pad_bytes;
2427                 iov[iov_count++].iov_len = padding;
2428                 rx_size += padding;
2429         }
2430
2431         if (conn->conn_ops->DataDigest) {
2432                 iov[iov_count].iov_base         = &checksum;
2433                 iov[iov_count++].iov_len        = ISCSI_CRC_LEN;
2434                 rx_size += ISCSI_CRC_LEN;
2435         }
2436
2437         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2438
2439         iscsit_unmap_iovec(cmd);
2440
2441         if (rx_got != rx_size) {
2442                 iscsit_rx_thread_wait_for_tcp(conn);
2443                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2444         }
2445
2446         if (conn->conn_ops->DataDigest) {
2447                 u32 data_crc;
2448
2449                 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2450                                                     cmd->write_data_done, length, padding,
2451                                                     cmd->pad_bytes);
2452
2453                 if (checksum != data_crc) {
2454                         pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2455                                 " does not match computed 0x%08x\n", checksum,
2456                                 data_crc);
2457
2458                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2459                                 pr_err("Unable to recover from"
2460                                         " Immediate Data digest failure while"
2461                                         " in ERL=0.\n");
2462                                 iscsit_reject_cmd(cmd,
2463                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2464                                                 (unsigned char *)hdr);
2465                                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2466                         } else {
2467                                 iscsit_reject_cmd(cmd,
2468                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2469                                                 (unsigned char *)hdr);
2470                                 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2471                         }
2472                 } else {
2473                         pr_debug("Got CRC32C DataDigest 0x%08x for"
2474                                 " %u bytes of Immediate Data\n", checksum,
2475                                 length);
2476                 }
2477         }
2478
2479         cmd->write_data_done += length;
2480
2481         if (cmd->write_data_done == cmd->se_cmd.data_length) {
2482                 spin_lock_bh(&cmd->istate_lock);
2483                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2484                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2485                 spin_unlock_bh(&cmd->istate_lock);
2486         }
2487
2488         return IMMEDIATE_DATA_NORMAL_OPERATION;
2489 }
2490
2491 /*
2492  *      Called with sess->conn_lock held.
2493  */
2494 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2495         with active network interface */
2496 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2497 {
2498         struct iscsi_cmd *cmd;
2499         struct iscsi_conn *conn_p;
2500         bool found = false;
2501
2502         /*
2503          * Only send a Asynchronous Message on connections whos network
2504          * interface is still functional.
2505          */
2506         list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2507                 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2508                         iscsit_inc_conn_usage_count(conn_p);
2509                         found = true;
2510                         break;
2511                 }
2512         }
2513
2514         if (!found)
2515                 return;
2516
2517         cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2518         if (!cmd) {
2519                 iscsit_dec_conn_usage_count(conn_p);
2520                 return;
2521         }
2522
2523         cmd->logout_cid = conn->cid;
2524         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2525         cmd->i_state = ISTATE_SEND_ASYNCMSG;
2526
2527         spin_lock_bh(&conn_p->cmd_lock);
2528         list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2529         spin_unlock_bh(&conn_p->cmd_lock);
2530
2531         iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2532         iscsit_dec_conn_usage_count(conn_p);
2533 }
2534
2535 static int iscsit_send_conn_drop_async_message(
2536         struct iscsi_cmd *cmd,
2537         struct iscsi_conn *conn)
2538 {
2539         struct iscsi_async *hdr;
2540
2541         cmd->tx_size = ISCSI_HDR_LEN;
2542         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2543
2544         hdr                     = (struct iscsi_async *) cmd->pdu;
2545         hdr->opcode             = ISCSI_OP_ASYNC_EVENT;
2546         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
2547         cmd->init_task_tag      = RESERVED_ITT;
2548         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2549         put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2550         cmd->stat_sn            = conn->stat_sn++;
2551         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2552         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2553         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2554         hdr->async_event        = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2555         hdr->param1             = cpu_to_be16(cmd->logout_cid);
2556         hdr->param2             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2557         hdr->param3             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2558
2559         if (conn->conn_ops->HeaderDigest) {
2560                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2561
2562                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2563                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2564
2565                 cmd->tx_size += ISCSI_CRC_LEN;
2566                 pr_debug("Attaching CRC32C HeaderDigest to"
2567                         " Async Message 0x%08x\n", *header_digest);
2568         }
2569
2570         cmd->iov_misc[0].iov_base       = cmd->pdu;
2571         cmd->iov_misc[0].iov_len        = cmd->tx_size;
2572         cmd->iov_misc_count             = 1;
2573
2574         pr_debug("Sending Connection Dropped Async Message StatSN:"
2575                 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2576                         cmd->logout_cid, conn->cid);
2577         return 0;
2578 }
2579
2580 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2581 {
2582         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2583             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2584                 wait_for_completion_interruptible_timeout(
2585                                         &conn->tx_half_close_comp,
2586                                         ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2587         }
2588 }
2589
2590 static void
2591 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2592                         struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2593                         bool set_statsn)
2594 {
2595         hdr->opcode             = ISCSI_OP_SCSI_DATA_IN;
2596         hdr->flags              = datain->flags;
2597         if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2598                 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2599                         hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2600                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2601                 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2602                         hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2603                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2604                 }
2605         }
2606         hton24(hdr->dlength, datain->length);
2607         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2608                 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2609                                 (struct scsi_lun *)&hdr->lun);
2610         else
2611                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2612
2613         hdr->itt                = cmd->init_task_tag;
2614
2615         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2616                 hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2617         else
2618                 hdr->ttt                = cpu_to_be32(0xFFFFFFFF);
2619         if (set_statsn)
2620                 hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2621         else
2622                 hdr->statsn             = cpu_to_be32(0xFFFFFFFF);
2623
2624         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2625         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2626         hdr->datasn             = cpu_to_be32(datain->data_sn);
2627         hdr->offset             = cpu_to_be32(datain->offset);
2628
2629         pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2630                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2631                 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2632                 ntohl(hdr->offset), datain->length, conn->cid);
2633 }
2634
2635 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2636 {
2637         struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2638         struct iscsi_datain datain;
2639         struct iscsi_datain_req *dr;
2640         struct kvec *iov;
2641         u32 iov_count = 0, tx_size = 0;
2642         int eodr = 0, ret, iov_ret;
2643         bool set_statsn = false;
2644
2645         memset(&datain, 0, sizeof(struct iscsi_datain));
2646         dr = iscsit_get_datain_values(cmd, &datain);
2647         if (!dr) {
2648                 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2649                                 cmd->init_task_tag);
2650                 return -1;
2651         }
2652         /*
2653          * Be paranoid and double check the logic for now.
2654          */
2655         if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2656                 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2657                         " datain.length: %u exceeds cmd->data_length: %u\n",
2658                         cmd->init_task_tag, datain.offset, datain.length,
2659                         cmd->se_cmd.data_length);
2660                 return -1;
2661         }
2662
2663         atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2664         /*
2665          * Special case for successfully execution w/ both DATAIN
2666          * and Sense Data.
2667          */
2668         if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2669             (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2670                 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2671         else {
2672                 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2673                     (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2674                         iscsit_increment_maxcmdsn(cmd, conn->sess);
2675                         cmd->stat_sn = conn->stat_sn++;
2676                         set_statsn = true;
2677                 } else if (dr->dr_complete ==
2678                            DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2679                         set_statsn = true;
2680         }
2681
2682         iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2683
2684         iov = &cmd->iov_data[0];
2685         iov[iov_count].iov_base = cmd->pdu;
2686         iov[iov_count++].iov_len        = ISCSI_HDR_LEN;
2687         tx_size += ISCSI_HDR_LEN;
2688
2689         if (conn->conn_ops->HeaderDigest) {
2690                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2691
2692                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
2693                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2694
2695                 iov[0].iov_len += ISCSI_CRC_LEN;
2696                 tx_size += ISCSI_CRC_LEN;
2697
2698                 pr_debug("Attaching CRC32 HeaderDigest"
2699                         " for DataIN PDU 0x%08x\n", *header_digest);
2700         }
2701
2702         iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
2703                                 datain.offset, datain.length);
2704         if (iov_ret < 0)
2705                 return -1;
2706
2707         iov_count += iov_ret;
2708         tx_size += datain.length;
2709
2710         cmd->padding = ((-datain.length) & 3);
2711         if (cmd->padding) {
2712                 iov[iov_count].iov_base         = cmd->pad_bytes;
2713                 iov[iov_count++].iov_len        = cmd->padding;
2714                 tx_size += cmd->padding;
2715
2716                 pr_debug("Attaching %u padding bytes\n",
2717                                 cmd->padding);
2718         }
2719         if (conn->conn_ops->DataDigest) {
2720                 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2721                          datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2722
2723                 iov[iov_count].iov_base = &cmd->data_crc;
2724                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2725                 tx_size += ISCSI_CRC_LEN;
2726
2727                 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2728                         " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2729         }
2730
2731         cmd->iov_data_count = iov_count;
2732         cmd->tx_size = tx_size;
2733
2734         ret = iscsit_fe_sendpage_sg(cmd, conn);
2735
2736         iscsit_unmap_iovec(cmd);
2737
2738         if (ret < 0) {
2739                 iscsit_tx_thread_wait_for_tcp(conn);
2740                 return ret;
2741         }
2742
2743         if (dr->dr_complete) {
2744                 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2745                                 2 : 1;
2746                 iscsit_free_datain_req(cmd, dr);
2747         }
2748
2749         return eodr;
2750 }
2751
2752 int
2753 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2754                         struct iscsi_logout_rsp *hdr)
2755 {
2756         struct iscsi_conn *logout_conn = NULL;
2757         struct iscsi_conn_recovery *cr = NULL;
2758         struct iscsi_session *sess = conn->sess;
2759         /*
2760          * The actual shutting down of Sessions and/or Connections
2761          * for CLOSESESSION and CLOSECONNECTION Logout Requests
2762          * is done in scsi_logout_post_handler().
2763          */
2764         switch (cmd->logout_reason) {
2765         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2766                 pr_debug("iSCSI session logout successful, setting"
2767                         " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2768                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2769                 break;
2770         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2771                 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2772                         break;
2773                 /*
2774                  * For CLOSECONNECTION logout requests carrying
2775                  * a matching logout CID -> local CID, the reference
2776                  * for the local CID will have been incremented in
2777                  * iscsi_logout_closeconnection().
2778                  *
2779                  * For CLOSECONNECTION logout requests carrying
2780                  * a different CID than the connection it arrived
2781                  * on, the connection responding to cmd->logout_cid
2782                  * is stopped in iscsit_logout_post_handler_diffcid().
2783                  */
2784
2785                 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2786                         " successful.\n", cmd->logout_cid, conn->cid);
2787                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2788                 break;
2789         case ISCSI_LOGOUT_REASON_RECOVERY:
2790                 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2791                     (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2792                         break;
2793                 /*
2794                  * If the connection is still active from our point of view
2795                  * force connection recovery to occur.
2796                  */
2797                 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2798                                 cmd->logout_cid);
2799                 if (logout_conn) {
2800                         iscsit_connection_reinstatement_rcfr(logout_conn);
2801                         iscsit_dec_conn_usage_count(logout_conn);
2802                 }
2803
2804                 cr = iscsit_get_inactive_connection_recovery_entry(
2805                                 conn->sess, cmd->logout_cid);
2806                 if (!cr) {
2807                         pr_err("Unable to locate CID: %hu for"
2808                         " REMOVECONNFORRECOVERY Logout Request.\n",
2809                                 cmd->logout_cid);
2810                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2811                         break;
2812                 }
2813
2814                 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2815
2816                 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2817                         " for recovery for CID: %hu on CID: %hu successful.\n",
2818                                 cmd->logout_cid, conn->cid);
2819                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2820                 break;
2821         default:
2822                 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2823                                 cmd->logout_reason);
2824                 return -1;
2825         }
2826
2827         hdr->opcode             = ISCSI_OP_LOGOUT_RSP;
2828         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2829         hdr->response           = cmd->logout_response;
2830         hdr->itt                = cmd->init_task_tag;
2831         cmd->stat_sn            = conn->stat_sn++;
2832         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2833
2834         iscsit_increment_maxcmdsn(cmd, conn->sess);
2835         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2836         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2837
2838         pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2839                 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2840                 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2841                 cmd->logout_cid, conn->cid);
2842
2843         return 0;
2844 }
2845 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2846
2847 static int
2848 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2849 {
2850         struct kvec *iov;
2851         int niov = 0, tx_size, rc;
2852
2853         rc = iscsit_build_logout_rsp(cmd, conn,
2854                         (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2855         if (rc < 0)
2856                 return rc;
2857
2858         tx_size = ISCSI_HDR_LEN;
2859         iov = &cmd->iov_misc[0];
2860         iov[niov].iov_base      = cmd->pdu;
2861         iov[niov++].iov_len     = ISCSI_HDR_LEN;
2862
2863         if (conn->conn_ops->HeaderDigest) {
2864                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2865
2866                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, &cmd->pdu[0],
2867                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2868
2869                 iov[0].iov_len += ISCSI_CRC_LEN;
2870                 tx_size += ISCSI_CRC_LEN;
2871                 pr_debug("Attaching CRC32C HeaderDigest to"
2872                         " Logout Response 0x%08x\n", *header_digest);
2873         }
2874         cmd->iov_misc_count = niov;
2875         cmd->tx_size = tx_size;
2876
2877         return 0;
2878 }
2879
2880 void
2881 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2882                        struct iscsi_nopin *hdr, bool nopout_response)
2883 {
2884         hdr->opcode             = ISCSI_OP_NOOP_IN;
2885         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2886         hton24(hdr->dlength, cmd->buf_ptr_size);
2887         if (nopout_response)
2888                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2889         hdr->itt                = cmd->init_task_tag;
2890         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2891         cmd->stat_sn            = (nopout_response) ? conn->stat_sn++ :
2892                                   conn->stat_sn;
2893         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2894
2895         if (nopout_response)
2896                 iscsit_increment_maxcmdsn(cmd, conn->sess);
2897
2898         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2899         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2900
2901         pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2902                 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2903                 "Solicitied" : "Unsolicitied", cmd->init_task_tag,
2904                 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2905 }
2906 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2907
2908 /*
2909  *      Unsolicited NOPIN, either requesting a response or not.
2910  */
2911 static int iscsit_send_unsolicited_nopin(
2912         struct iscsi_cmd *cmd,
2913         struct iscsi_conn *conn,
2914         int want_response)
2915 {
2916         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2917         int tx_size = ISCSI_HDR_LEN, ret;
2918
2919         iscsit_build_nopin_rsp(cmd, conn, hdr, false);
2920
2921         if (conn->conn_ops->HeaderDigest) {
2922                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2923
2924                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2925                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2926
2927                 tx_size += ISCSI_CRC_LEN;
2928                 pr_debug("Attaching CRC32C HeaderDigest to"
2929                         " NopIN 0x%08x\n", *header_digest);
2930         }
2931
2932         cmd->iov_misc[0].iov_base       = cmd->pdu;
2933         cmd->iov_misc[0].iov_len        = tx_size;
2934         cmd->iov_misc_count     = 1;
2935         cmd->tx_size            = tx_size;
2936
2937         pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2938                 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2939
2940         ret = iscsit_send_tx_data(cmd, conn, 1);
2941         if (ret < 0) {
2942                 iscsit_tx_thread_wait_for_tcp(conn);
2943                 return ret;
2944         }
2945
2946         spin_lock_bh(&cmd->istate_lock);
2947         cmd->i_state = want_response ?
2948                 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
2949         spin_unlock_bh(&cmd->istate_lock);
2950
2951         return 0;
2952 }
2953
2954 static int
2955 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2956 {
2957         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2958         struct kvec *iov;
2959         u32 padding = 0;
2960         int niov = 0, tx_size;
2961
2962         iscsit_build_nopin_rsp(cmd, conn, hdr, true);
2963
2964         tx_size = ISCSI_HDR_LEN;
2965         iov = &cmd->iov_misc[0];
2966         iov[niov].iov_base      = cmd->pdu;
2967         iov[niov++].iov_len     = ISCSI_HDR_LEN;
2968
2969         if (conn->conn_ops->HeaderDigest) {
2970                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2971
2972                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2973                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2974
2975                 iov[0].iov_len += ISCSI_CRC_LEN;
2976                 tx_size += ISCSI_CRC_LEN;
2977                 pr_debug("Attaching CRC32C HeaderDigest"
2978                         " to NopIn 0x%08x\n", *header_digest);
2979         }
2980
2981         /*
2982          * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2983          * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2984          */
2985         if (cmd->buf_ptr_size) {
2986                 iov[niov].iov_base      = cmd->buf_ptr;
2987                 iov[niov++].iov_len     = cmd->buf_ptr_size;
2988                 tx_size += cmd->buf_ptr_size;
2989
2990                 pr_debug("Echoing back %u bytes of ping"
2991                         " data.\n", cmd->buf_ptr_size);
2992
2993                 padding = ((-cmd->buf_ptr_size) & 3);
2994                 if (padding != 0) {
2995                         iov[niov].iov_base = &cmd->pad_bytes;
2996                         iov[niov++].iov_len = padding;
2997                         tx_size += padding;
2998                         pr_debug("Attaching %u additional"
2999                                 " padding bytes.\n", padding);
3000                 }
3001                 if (conn->conn_ops->DataDigest) {
3002                         iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3003                                 cmd->buf_ptr, cmd->buf_ptr_size,
3004                                 padding, (u8 *)&cmd->pad_bytes,
3005                                 (u8 *)&cmd->data_crc);
3006
3007                         iov[niov].iov_base = &cmd->data_crc;
3008                         iov[niov++].iov_len = ISCSI_CRC_LEN;
3009                         tx_size += ISCSI_CRC_LEN;
3010                         pr_debug("Attached DataDigest for %u"
3011                                 " bytes of ping data, CRC 0x%08x\n",
3012                                 cmd->buf_ptr_size, cmd->data_crc);
3013                 }
3014         }
3015
3016         cmd->iov_misc_count = niov;
3017         cmd->tx_size = tx_size;
3018
3019         return 0;
3020 }
3021
3022 static int iscsit_send_r2t(
3023         struct iscsi_cmd *cmd,
3024         struct iscsi_conn *conn)
3025 {
3026         int tx_size = 0;
3027         struct iscsi_r2t *r2t;
3028         struct iscsi_r2t_rsp *hdr;
3029         int ret;
3030
3031         r2t = iscsit_get_r2t_from_list(cmd);
3032         if (!r2t)
3033                 return -1;
3034
3035         hdr                     = (struct iscsi_r2t_rsp *) cmd->pdu;
3036         memset(hdr, 0, ISCSI_HDR_LEN);
3037         hdr->opcode             = ISCSI_OP_R2T;
3038         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3039         int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3040                         (struct scsi_lun *)&hdr->lun);
3041         hdr->itt                = cmd->init_task_tag;
3042         r2t->targ_xfer_tag      = session_get_next_ttt(conn->sess);
3043         hdr->ttt                = cpu_to_be32(r2t->targ_xfer_tag);
3044         hdr->statsn             = cpu_to_be32(conn->stat_sn);
3045         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3046         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3047         hdr->r2tsn              = cpu_to_be32(r2t->r2t_sn);
3048         hdr->data_offset        = cpu_to_be32(r2t->offset);
3049         hdr->data_length        = cpu_to_be32(r2t->xfer_len);
3050
3051         cmd->iov_misc[0].iov_base       = cmd->pdu;
3052         cmd->iov_misc[0].iov_len        = ISCSI_HDR_LEN;
3053         tx_size += ISCSI_HDR_LEN;
3054
3055         if (conn->conn_ops->HeaderDigest) {
3056                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3057
3058                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3059                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3060
3061                 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3062                 tx_size += ISCSI_CRC_LEN;
3063                 pr_debug("Attaching CRC32 HeaderDigest for R2T"
3064                         " PDU 0x%08x\n", *header_digest);
3065         }
3066
3067         pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3068                 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3069                 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3070                 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3071                         r2t->offset, r2t->xfer_len, conn->cid);
3072
3073         cmd->iov_misc_count = 1;
3074         cmd->tx_size = tx_size;
3075
3076         spin_lock_bh(&cmd->r2t_lock);
3077         r2t->sent_r2t = 1;
3078         spin_unlock_bh(&cmd->r2t_lock);
3079
3080         ret = iscsit_send_tx_data(cmd, conn, 1);
3081         if (ret < 0) {
3082                 iscsit_tx_thread_wait_for_tcp(conn);
3083                 return ret;
3084         }
3085
3086         spin_lock_bh(&cmd->dataout_timeout_lock);
3087         iscsit_start_dataout_timer(cmd, conn);
3088         spin_unlock_bh(&cmd->dataout_timeout_lock);
3089
3090         return 0;
3091 }
3092
3093 /*
3094  *      @recovery: If called from iscsi_task_reassign_complete_write() for
3095  *              connection recovery.
3096  */
3097 int iscsit_build_r2ts_for_cmd(
3098         struct iscsi_conn *conn,
3099         struct iscsi_cmd *cmd,
3100         bool recovery)
3101 {
3102         int first_r2t = 1;
3103         u32 offset = 0, xfer_len = 0;
3104
3105         spin_lock_bh(&cmd->r2t_lock);
3106         if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3107                 spin_unlock_bh(&cmd->r2t_lock);
3108                 return 0;
3109         }
3110
3111         if (conn->sess->sess_ops->DataSequenceInOrder &&
3112             !recovery)
3113                 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3114
3115         while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3116                 if (conn->sess->sess_ops->DataSequenceInOrder) {
3117                         offset = cmd->r2t_offset;
3118
3119                         if (first_r2t && recovery) {
3120                                 int new_data_end = offset +
3121                                         conn->sess->sess_ops->MaxBurstLength -
3122                                         cmd->next_burst_len;
3123
3124                                 if (new_data_end > cmd->se_cmd.data_length)
3125                                         xfer_len = cmd->se_cmd.data_length - offset;
3126                                 else
3127                                         xfer_len =
3128                                                 conn->sess->sess_ops->MaxBurstLength -
3129                                                 cmd->next_burst_len;
3130                         } else {
3131                                 int new_data_end = offset +
3132                                         conn->sess->sess_ops->MaxBurstLength;
3133
3134                                 if (new_data_end > cmd->se_cmd.data_length)
3135                                         xfer_len = cmd->se_cmd.data_length - offset;
3136                                 else
3137                                         xfer_len = conn->sess->sess_ops->MaxBurstLength;
3138                         }
3139                         cmd->r2t_offset += xfer_len;
3140
3141                         if (cmd->r2t_offset == cmd->se_cmd.data_length)
3142                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3143                 } else {
3144                         struct iscsi_seq *seq;
3145
3146                         seq = iscsit_get_seq_holder_for_r2t(cmd);
3147                         if (!seq) {
3148                                 spin_unlock_bh(&cmd->r2t_lock);
3149                                 return -1;
3150                         }
3151
3152                         offset = seq->offset;
3153                         xfer_len = seq->xfer_len;
3154
3155                         if (cmd->seq_send_order == cmd->seq_count)
3156                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3157                 }
3158                 cmd->outstanding_r2ts++;
3159                 first_r2t = 0;
3160
3161                 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3162                         spin_unlock_bh(&cmd->r2t_lock);
3163                         return -1;
3164                 }
3165
3166                 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3167                         break;
3168         }
3169         spin_unlock_bh(&cmd->r2t_lock);
3170
3171         return 0;
3172 }
3173
3174 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3175                         bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3176 {
3177         if (inc_stat_sn)
3178                 cmd->stat_sn = conn->stat_sn++;
3179
3180         atomic_long_inc(&conn->sess->rsp_pdus);
3181
3182         memset(hdr, 0, ISCSI_HDR_LEN);
3183         hdr->opcode             = ISCSI_OP_SCSI_CMD_RSP;
3184         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3185         if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3186                 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3187                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3188         } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3189                 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3190                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3191         }
3192         hdr->response           = cmd->iscsi_response;
3193         hdr->cmd_status         = cmd->se_cmd.scsi_status;
3194         hdr->itt                = cmd->init_task_tag;
3195         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3196
3197         iscsit_increment_maxcmdsn(cmd, conn->sess);
3198         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3199         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3200
3201         pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3202                 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3203                 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3204                 cmd->se_cmd.scsi_status, conn->cid);
3205 }
3206 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3207
3208 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3209 {
3210         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3211         struct kvec *iov;
3212         u32 padding = 0, tx_size = 0;
3213         int iov_count = 0;
3214         bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3215
3216         iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3217
3218         iov = &cmd->iov_misc[0];
3219         iov[iov_count].iov_base = cmd->pdu;
3220         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3221         tx_size += ISCSI_HDR_LEN;
3222
3223         /*
3224          * Attach SENSE DATA payload to iSCSI Response PDU
3225          */
3226         if (cmd->se_cmd.sense_buffer &&
3227            ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3228             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3229                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3230                 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3231
3232                 padding         = -(cmd->se_cmd.scsi_sense_length) & 3;
3233                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3234                 iov[iov_count].iov_base = cmd->sense_buffer;
3235                 iov[iov_count++].iov_len =
3236                                 (cmd->se_cmd.scsi_sense_length + padding);
3237                 tx_size += cmd->se_cmd.scsi_sense_length;
3238
3239                 if (padding) {
3240                         memset(cmd->sense_buffer +
3241                                 cmd->se_cmd.scsi_sense_length, 0, padding);
3242                         tx_size += padding;
3243                         pr_debug("Adding %u bytes of padding to"
3244                                 " SENSE.\n", padding);
3245                 }
3246
3247                 if (conn->conn_ops->DataDigest) {
3248                         iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3249                                 cmd->sense_buffer,
3250                                 (cmd->se_cmd.scsi_sense_length + padding),
3251                                 0, NULL, (u8 *)&cmd->data_crc);
3252
3253                         iov[iov_count].iov_base    = &cmd->data_crc;
3254                         iov[iov_count++].iov_len     = ISCSI_CRC_LEN;
3255                         tx_size += ISCSI_CRC_LEN;
3256
3257                         pr_debug("Attaching CRC32 DataDigest for"
3258                                 " SENSE, %u bytes CRC 0x%08x\n",
3259                                 (cmd->se_cmd.scsi_sense_length + padding),
3260                                 cmd->data_crc);
3261                 }
3262
3263                 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3264                                 " Response PDU\n",
3265                                 cmd->se_cmd.scsi_sense_length);
3266         }
3267
3268         if (conn->conn_ops->HeaderDigest) {
3269                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3270
3271                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
3272                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3273
3274                 iov[0].iov_len += ISCSI_CRC_LEN;
3275                 tx_size += ISCSI_CRC_LEN;
3276                 pr_debug("Attaching CRC32 HeaderDigest for Response"
3277                                 " PDU 0x%08x\n", *header_digest);
3278         }
3279
3280         cmd->iov_misc_count = iov_count;
3281         cmd->tx_size = tx_size;
3282
3283         return 0;
3284 }
3285
3286 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3287 {
3288         switch (se_tmr->response) {
3289         case TMR_FUNCTION_COMPLETE:
3290                 return ISCSI_TMF_RSP_COMPLETE;
3291         case TMR_TASK_DOES_NOT_EXIST:
3292                 return ISCSI_TMF_RSP_NO_TASK;
3293         case TMR_LUN_DOES_NOT_EXIST:
3294                 return ISCSI_TMF_RSP_NO_LUN;
3295         case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3296                 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3297         case TMR_FUNCTION_REJECTED:
3298         default:
3299                 return ISCSI_TMF_RSP_REJECTED;
3300         }
3301 }
3302
3303 void
3304 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3305                           struct iscsi_tm_rsp *hdr)
3306 {
3307         struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3308
3309         hdr->opcode             = ISCSI_OP_SCSI_TMFUNC_RSP;
3310         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
3311         hdr->response           = iscsit_convert_tcm_tmr_rsp(se_tmr);
3312         hdr->itt                = cmd->init_task_tag;
3313         cmd->stat_sn            = conn->stat_sn++;
3314         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3315
3316         iscsit_increment_maxcmdsn(cmd, conn->sess);
3317         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3318         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3319
3320         pr_debug("Built Task Management Response ITT: 0x%08x,"
3321                 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3322                 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3323 }
3324 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3325
3326 static int
3327 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3328 {
3329         struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3330         u32 tx_size = 0;
3331
3332         iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3333
3334         cmd->iov_misc[0].iov_base       = cmd->pdu;
3335         cmd->iov_misc[0].iov_len        = ISCSI_HDR_LEN;
3336         tx_size += ISCSI_HDR_LEN;
3337
3338         if (conn->conn_ops->HeaderDigest) {
3339                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3340
3341                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3342                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3343
3344                 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3345                 tx_size += ISCSI_CRC_LEN;
3346                 pr_debug("Attaching CRC32 HeaderDigest for Task"
3347                         " Mgmt Response PDU 0x%08x\n", *header_digest);
3348         }
3349
3350         cmd->iov_misc_count = 1;
3351         cmd->tx_size = tx_size;
3352
3353         return 0;
3354 }
3355
3356 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3357 {
3358         bool ret = false;
3359
3360         if (np->np_sockaddr.ss_family == AF_INET6) {
3361                 const struct sockaddr_in6 sin6 = {
3362                         .sin6_addr = IN6ADDR_ANY_INIT };
3363                 struct sockaddr_in6 *sock_in6 =
3364                          (struct sockaddr_in6 *)&np->np_sockaddr;
3365
3366                 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3367                                 sin6.sin6_addr.s6_addr, 16))
3368                         ret = true;
3369         } else {
3370                 struct sockaddr_in * sock_in =
3371                         (struct sockaddr_in *)&np->np_sockaddr;
3372
3373                 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
3374                         ret = true;
3375         }
3376
3377         return ret;
3378 }
3379
3380 #define SENDTARGETS_BUF_LIMIT 32768U
3381
3382 static int
3383 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
3384                                   enum iscsit_transport_type network_transport,
3385                                   int skip_bytes, bool *completed)
3386 {
3387         char *payload = NULL;
3388         struct iscsi_conn *conn = cmd->conn;
3389         struct iscsi_portal_group *tpg;
3390         struct iscsi_tiqn *tiqn;
3391         struct iscsi_tpg_np *tpg_np;
3392         int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3393         int target_name_printed;
3394         unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3395         unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3396         bool active;
3397
3398         buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3399                          SENDTARGETS_BUF_LIMIT);
3400
3401         payload = kzalloc(buffer_len, GFP_KERNEL);
3402         if (!payload) {
3403                 pr_err("Unable to allocate memory for sendtargets"
3404                                 " response.\n");
3405                 return -ENOMEM;
3406         }
3407         /*
3408          * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3409          * explicit case..
3410          */
3411         if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3412                 text_ptr = strchr(text_in, '=');
3413                 if (!text_ptr) {
3414                         pr_err("Unable to locate '=' string in text_in:"
3415                                " %s\n", text_in);
3416                         kfree(payload);
3417                         return -EINVAL;
3418                 }
3419                 /*
3420                  * Skip over '=' character..
3421                  */
3422                 text_ptr += 1;
3423         }
3424
3425         spin_lock(&tiqn_lock);
3426         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3427                 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3428                      strcmp(tiqn->tiqn, text_ptr)) {
3429                         continue;
3430                 }
3431
3432                 target_name_printed = 0;
3433
3434                 spin_lock(&tiqn->tiqn_tpg_lock);
3435                 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3436
3437                         /* If demo_mode_discovery=0 and generate_node_acls=0
3438                          * (demo mode dislabed) do not return
3439                          * TargetName+TargetAddress unless a NodeACL exists.
3440                          */
3441
3442                         if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3443                             (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3444                             (!target_tpg_has_node_acl(&tpg->tpg_se_tpg,
3445                                 cmd->conn->sess->sess_ops->InitiatorName))) {
3446                                 continue;
3447                         }
3448
3449                         spin_lock(&tpg->tpg_state_lock);
3450                         active = (tpg->tpg_state == TPG_STATE_ACTIVE);
3451                         spin_unlock(&tpg->tpg_state_lock);
3452
3453                         if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets)
3454                                 continue;
3455
3456                         spin_lock(&tpg->tpg_np_lock);
3457                         list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3458                                                 tpg_np_list) {
3459                                 struct iscsi_np *np = tpg_np->tpg_np;
3460                                 bool inaddr_any = iscsit_check_inaddr_any(np);
3461                                 struct sockaddr_storage *sockaddr;
3462
3463                                 if (np->np_network_transport != network_transport)
3464                                         continue;
3465
3466                                 if (!target_name_printed) {
3467                                         len = sprintf(buf, "TargetName=%s",
3468                                                       tiqn->tiqn);
3469                                         len += 1;
3470
3471                                         if ((len + payload_len) > buffer_len) {
3472                                                 spin_unlock(&tpg->tpg_np_lock);
3473                                                 spin_unlock(&tiqn->tiqn_tpg_lock);
3474                                                 end_of_buf = 1;
3475                                                 goto eob;
3476                                         }
3477
3478                                         if (skip_bytes && len <= skip_bytes) {
3479                                                 skip_bytes -= len;
3480                                         } else {
3481                                                 memcpy(payload + payload_len, buf, len);
3482                                                 payload_len += len;
3483                                                 target_name_printed = 1;
3484                                                 if (len > skip_bytes)
3485                                                         skip_bytes = 0;
3486                                         }
3487                                 }
3488
3489                                 if (inaddr_any)
3490                                         sockaddr = &conn->local_sockaddr;
3491                                 else
3492                                         sockaddr = &np->np_sockaddr;
3493
3494                                 len = sprintf(buf, "TargetAddress="
3495                                               "%pISpc,%hu",
3496                                               sockaddr,
3497                                               tpg->tpgt);
3498                                 len += 1;
3499
3500                                 if ((len + payload_len) > buffer_len) {
3501                                         spin_unlock(&tpg->tpg_np_lock);
3502                                         spin_unlock(&tiqn->tiqn_tpg_lock);
3503                                         end_of_buf = 1;
3504                                         goto eob;
3505                                 }
3506
3507                                 if (skip_bytes && len <= skip_bytes) {
3508                                         skip_bytes -= len;
3509                                 } else {
3510                                         memcpy(payload + payload_len, buf, len);
3511                                         payload_len += len;
3512                                         if (len > skip_bytes)
3513                                                 skip_bytes = 0;
3514                                 }
3515                         }
3516                         spin_unlock(&tpg->tpg_np_lock);
3517                 }
3518                 spin_unlock(&tiqn->tiqn_tpg_lock);
3519 eob:
3520                 if (end_of_buf) {
3521                         *completed = false;
3522                         break;
3523                 }
3524
3525                 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3526                         break;
3527         }
3528         spin_unlock(&tiqn_lock);
3529
3530         cmd->buf_ptr = payload;
3531
3532         return payload_len;
3533 }
3534
3535 int
3536 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3537                       struct iscsi_text_rsp *hdr,
3538                       enum iscsit_transport_type network_transport)
3539 {
3540         int text_length, padding;
3541         bool completed = true;
3542
3543         text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3544                                                         cmd->read_data_done,
3545                                                         &completed);
3546         if (text_length < 0)
3547                 return text_length;
3548
3549         if (completed) {
3550                 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3551         } else {
3552                 hdr->flags |= ISCSI_FLAG_TEXT_CONTINUE;
3553                 cmd->read_data_done += text_length;
3554                 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3555                         cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3556         }
3557         hdr->opcode = ISCSI_OP_TEXT_RSP;
3558         padding = ((-text_length) & 3);
3559         hton24(hdr->dlength, text_length);
3560         hdr->itt = cmd->init_task_tag;
3561         hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3562         cmd->stat_sn = conn->stat_sn++;
3563         hdr->statsn = cpu_to_be32(cmd->stat_sn);
3564
3565         iscsit_increment_maxcmdsn(cmd, conn->sess);
3566         /*
3567          * Reset maxcmdsn_inc in multi-part text payload exchanges to
3568          * correctly increment MaxCmdSN for each response answering a
3569          * non immediate text request with a valid CmdSN.
3570          */
3571         cmd->maxcmdsn_inc = 0;
3572         hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3573         hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3574
3575         pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3576                 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3577                 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3578                 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3579                 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3580
3581         return text_length + padding;
3582 }
3583 EXPORT_SYMBOL(iscsit_build_text_rsp);
3584
3585 static int iscsit_send_text_rsp(
3586         struct iscsi_cmd *cmd,
3587         struct iscsi_conn *conn)
3588 {
3589         struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3590         struct kvec *iov;
3591         u32 tx_size = 0;
3592         int text_length, iov_count = 0, rc;
3593
3594         rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_TCP);
3595         if (rc < 0)
3596                 return rc;
3597
3598         text_length = rc;
3599         iov = &cmd->iov_misc[0];
3600         iov[iov_count].iov_base = cmd->pdu;
3601         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3602         iov[iov_count].iov_base = cmd->buf_ptr;
3603         iov[iov_count++].iov_len = text_length;
3604
3605         tx_size += (ISCSI_HDR_LEN + text_length);
3606
3607         if (conn->conn_ops->HeaderDigest) {
3608                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3609
3610                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3611                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3612
3613                 iov[0].iov_len += ISCSI_CRC_LEN;
3614                 tx_size += ISCSI_CRC_LEN;
3615                 pr_debug("Attaching CRC32 HeaderDigest for"
3616                         " Text Response PDU 0x%08x\n", *header_digest);
3617         }
3618
3619         if (conn->conn_ops->DataDigest) {
3620                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3621                                 cmd->buf_ptr, text_length,
3622                                 0, NULL, (u8 *)&cmd->data_crc);
3623
3624                 iov[iov_count].iov_base = &cmd->data_crc;
3625                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3626                 tx_size += ISCSI_CRC_LEN;
3627
3628                 pr_debug("Attaching DataDigest for %u bytes of text"
3629                         " data, CRC 0x%08x\n", text_length,
3630                         cmd->data_crc);
3631         }
3632
3633         cmd->iov_misc_count = iov_count;
3634         cmd->tx_size = tx_size;
3635
3636         return 0;
3637 }
3638
3639 void
3640 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3641                     struct iscsi_reject *hdr)
3642 {
3643         hdr->opcode             = ISCSI_OP_REJECT;
3644         hdr->reason             = cmd->reject_reason;
3645         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3646         hton24(hdr->dlength, ISCSI_HDR_LEN);
3647         hdr->ffffffff           = cpu_to_be32(0xffffffff);
3648         cmd->stat_sn            = conn->stat_sn++;
3649         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3650         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3651         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3652
3653 }
3654 EXPORT_SYMBOL(iscsit_build_reject);
3655
3656 static int iscsit_send_reject(
3657         struct iscsi_cmd *cmd,
3658         struct iscsi_conn *conn)
3659 {
3660         struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3661         struct kvec *iov;
3662         u32 iov_count = 0, tx_size;
3663
3664         iscsit_build_reject(cmd, conn, hdr);
3665
3666         iov = &cmd->iov_misc[0];
3667         iov[iov_count].iov_base = cmd->pdu;
3668         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3669         iov[iov_count].iov_base = cmd->buf_ptr;
3670         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3671
3672         tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3673
3674         if (conn->conn_ops->HeaderDigest) {
3675                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3676
3677                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3678                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3679
3680                 iov[0].iov_len += ISCSI_CRC_LEN;
3681                 tx_size += ISCSI_CRC_LEN;
3682                 pr_debug("Attaching CRC32 HeaderDigest for"
3683                         " REJECT PDU 0x%08x\n", *header_digest);
3684         }
3685
3686         if (conn->conn_ops->DataDigest) {
3687                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->buf_ptr,
3688                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)&cmd->data_crc);
3689
3690                 iov[iov_count].iov_base = &cmd->data_crc;
3691                 iov[iov_count++].iov_len  = ISCSI_CRC_LEN;
3692                 tx_size += ISCSI_CRC_LEN;
3693                 pr_debug("Attaching CRC32 DataDigest for REJECT"
3694                                 " PDU 0x%08x\n", cmd->data_crc);
3695         }
3696
3697         cmd->iov_misc_count = iov_count;
3698         cmd->tx_size = tx_size;
3699
3700         pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3701                 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3702
3703         return 0;
3704 }
3705
3706 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3707 {
3708         int ord, cpu;
3709         /*
3710          * bitmap_id is assigned from iscsit_global->ts_bitmap from
3711          * within iscsit_start_kthreads()
3712          *
3713          * Here we use bitmap_id to determine which CPU that this
3714          * iSCSI connection's RX/TX threads will be scheduled to
3715          * execute upon.
3716          */
3717         ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3718         for_each_online_cpu(cpu) {
3719                 if (ord-- == 0) {
3720                         cpumask_set_cpu(cpu, conn->conn_cpumask);
3721                         return;
3722                 }
3723         }
3724         /*
3725          * This should never be reached..
3726          */
3727         dump_stack();
3728         cpumask_setall(conn->conn_cpumask);
3729 }
3730
3731 static inline void iscsit_thread_check_cpumask(
3732         struct iscsi_conn *conn,
3733         struct task_struct *p,
3734         int mode)
3735 {
3736         /*
3737          * mode == 1 signals iscsi_target_tx_thread() usage.
3738          * mode == 0 signals iscsi_target_rx_thread() usage.
3739          */
3740         if (mode == 1) {
3741                 if (!conn->conn_tx_reset_cpumask)
3742                         return;
3743                 conn->conn_tx_reset_cpumask = 0;
3744         } else {
3745                 if (!conn->conn_rx_reset_cpumask)
3746                         return;
3747                 conn->conn_rx_reset_cpumask = 0;
3748         }
3749         /*
3750          * Update the CPU mask for this single kthread so that
3751          * both TX and RX kthreads are scheduled to run on the
3752          * same CPU.
3753          */
3754         set_cpus_allowed_ptr(p, conn->conn_cpumask);
3755 }
3756
3757 static int
3758 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3759 {
3760         int ret;
3761
3762         switch (state) {
3763         case ISTATE_SEND_R2T:
3764                 ret = iscsit_send_r2t(cmd, conn);
3765                 if (ret < 0)
3766                         goto err;
3767                 break;
3768         case ISTATE_REMOVE:
3769                 spin_lock_bh(&conn->cmd_lock);
3770                 list_del_init(&cmd->i_conn_node);
3771                 spin_unlock_bh(&conn->cmd_lock);
3772
3773                 iscsit_free_cmd(cmd, false);
3774                 break;
3775         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3776                 iscsit_mod_nopin_response_timer(conn);
3777                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3778                 if (ret < 0)
3779                         goto err;
3780                 break;
3781         case ISTATE_SEND_NOPIN_NO_RESPONSE:
3782                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3783                 if (ret < 0)
3784                         goto err;
3785                 break;
3786         default:
3787                 pr_err("Unknown Opcode: 0x%02x ITT:"
3788                        " 0x%08x, i_state: %d on CID: %hu\n",
3789                        cmd->iscsi_opcode, cmd->init_task_tag, state,
3790                        conn->cid);
3791                 goto err;
3792         }
3793
3794         return 0;
3795
3796 err:
3797         return -1;
3798 }
3799
3800 static int
3801 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3802 {
3803         struct iscsit_transport *t = conn->conn_transport;
3804         struct iscsi_queue_req *qr;
3805         struct iscsi_cmd *cmd;
3806         u8 state;
3807         int ret;
3808
3809         while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3810                 atomic_set(&conn->check_immediate_queue, 0);
3811                 cmd = qr->cmd;
3812                 state = qr->state;
3813                 kmem_cache_free(lio_qr_cache, qr);
3814
3815                 ret = t->iscsit_immediate_queue(conn, cmd, state);
3816                 if (ret < 0)
3817                         return ret;
3818         }
3819
3820         return 0;
3821 }
3822
3823 static int
3824 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3825 {
3826         int ret;
3827
3828 check_rsp_state:
3829         switch (state) {
3830         case ISTATE_SEND_DATAIN:
3831                 ret = iscsit_send_datain(cmd, conn);
3832                 if (ret < 0)
3833                         goto err;
3834                 else if (!ret)
3835                         /* more drs */
3836                         goto check_rsp_state;
3837                 else if (ret == 1) {
3838                         /* all done */
3839                         spin_lock_bh(&cmd->istate_lock);
3840                         cmd->i_state = ISTATE_SENT_STATUS;
3841                         spin_unlock_bh(&cmd->istate_lock);
3842
3843                         if (atomic_read(&conn->check_immediate_queue))
3844                                 return 1;
3845
3846                         return 0;
3847                 } else if (ret == 2) {
3848                         /* Still must send status,
3849                            SCF_TRANSPORT_TASK_SENSE was set */
3850                         spin_lock_bh(&cmd->istate_lock);
3851                         cmd->i_state = ISTATE_SEND_STATUS;
3852                         spin_unlock_bh(&cmd->istate_lock);
3853                         state = ISTATE_SEND_STATUS;
3854                         goto check_rsp_state;
3855                 }
3856
3857                 break;
3858         case ISTATE_SEND_STATUS:
3859         case ISTATE_SEND_STATUS_RECOVERY:
3860                 ret = iscsit_send_response(cmd, conn);
3861                 break;
3862         case ISTATE_SEND_LOGOUTRSP:
3863                 ret = iscsit_send_logout(cmd, conn);
3864                 break;
3865         case ISTATE_SEND_ASYNCMSG:
3866                 ret = iscsit_send_conn_drop_async_message(
3867                         cmd, conn);
3868                 break;
3869         case ISTATE_SEND_NOPIN:
3870                 ret = iscsit_send_nopin(cmd, conn);
3871                 break;
3872         case ISTATE_SEND_REJECT:
3873                 ret = iscsit_send_reject(cmd, conn);
3874                 break;
3875         case ISTATE_SEND_TASKMGTRSP:
3876                 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3877                 if (ret != 0)
3878                         break;
3879                 ret = iscsit_tmr_post_handler(cmd, conn);
3880                 if (ret != 0)
3881                         iscsit_fall_back_to_erl0(conn->sess);
3882                 break;
3883         case ISTATE_SEND_TEXTRSP:
3884                 ret = iscsit_send_text_rsp(cmd, conn);
3885                 break;
3886         default:
3887                 pr_err("Unknown Opcode: 0x%02x ITT:"
3888                        " 0x%08x, i_state: %d on CID: %hu\n",
3889                        cmd->iscsi_opcode, cmd->init_task_tag,
3890                        state, conn->cid);
3891                 goto err;
3892         }
3893         if (ret < 0)
3894                 goto err;
3895
3896         if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3897                 iscsit_tx_thread_wait_for_tcp(conn);
3898                 iscsit_unmap_iovec(cmd);
3899                 goto err;
3900         }
3901         iscsit_unmap_iovec(cmd);
3902
3903         switch (state) {
3904         case ISTATE_SEND_LOGOUTRSP:
3905                 if (!iscsit_logout_post_handler(cmd, conn))
3906                         return -ECONNRESET;
3907                 /* fall through */
3908         case ISTATE_SEND_STATUS:
3909         case ISTATE_SEND_ASYNCMSG:
3910         case ISTATE_SEND_NOPIN:
3911         case ISTATE_SEND_STATUS_RECOVERY:
3912         case ISTATE_SEND_TEXTRSP:
3913         case ISTATE_SEND_TASKMGTRSP:
3914         case ISTATE_SEND_REJECT:
3915                 spin_lock_bh(&cmd->istate_lock);
3916                 cmd->i_state = ISTATE_SENT_STATUS;
3917                 spin_unlock_bh(&cmd->istate_lock);
3918                 break;
3919         default:
3920                 pr_err("Unknown Opcode: 0x%02x ITT:"
3921                        " 0x%08x, i_state: %d on CID: %hu\n",
3922                        cmd->iscsi_opcode, cmd->init_task_tag,
3923                        cmd->i_state, conn->cid);
3924                 goto err;
3925         }
3926
3927         if (atomic_read(&conn->check_immediate_queue))
3928                 return 1;
3929
3930         return 0;
3931
3932 err:
3933         return -1;
3934 }
3935
3936 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3937 {
3938         struct iscsit_transport *t = conn->conn_transport;
3939         struct iscsi_queue_req *qr;
3940         struct iscsi_cmd *cmd;
3941         u8 state;
3942         int ret;
3943
3944         while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3945                 cmd = qr->cmd;
3946                 state = qr->state;
3947                 kmem_cache_free(lio_qr_cache, qr);
3948
3949                 ret = t->iscsit_response_queue(conn, cmd, state);
3950                 if (ret == 1 || ret < 0)
3951                         return ret;
3952         }
3953
3954         return 0;
3955 }
3956
3957 int iscsi_target_tx_thread(void *arg)
3958 {
3959         int ret = 0;
3960         struct iscsi_conn *conn = arg;
3961         bool conn_freed = false;
3962
3963         /*
3964          * Allow ourselves to be interrupted by SIGINT so that a
3965          * connection recovery / failure event can be triggered externally.
3966          */
3967         allow_signal(SIGINT);
3968
3969         while (!kthread_should_stop()) {
3970                 /*
3971                  * Ensure that both TX and RX per connection kthreads
3972                  * are scheduled to run on the same CPU.
3973                  */
3974                 iscsit_thread_check_cpumask(conn, current, 1);
3975
3976                 wait_event_interruptible(conn->queues_wq,
3977                                          !iscsit_conn_all_queues_empty(conn));
3978
3979                 if (signal_pending(current))
3980                         goto transport_err;
3981
3982 get_immediate:
3983                 ret = iscsit_handle_immediate_queue(conn);
3984                 if (ret < 0)
3985                         goto transport_err;
3986
3987                 ret = iscsit_handle_response_queue(conn);
3988                 if (ret == 1) {
3989                         goto get_immediate;
3990                 } else if (ret == -ECONNRESET) {
3991                         conn_freed = true;
3992                         goto out;
3993                 } else if (ret < 0) {
3994                         goto transport_err;
3995                 }
3996         }
3997
3998 transport_err:
3999         /*
4000          * Avoid the normal connection failure code-path if this connection
4001          * is still within LOGIN mode, and iscsi_np process context is
4002          * responsible for cleaning up the early connection failure.
4003          */
4004         if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
4005                 iscsit_take_action_for_connection_exit(conn, &conn_freed);
4006 out:
4007         if (!conn_freed) {
4008                 while (!kthread_should_stop()) {
4009                         msleep(100);
4010                 }
4011         }
4012         return 0;
4013 }
4014
4015 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
4016 {
4017         struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
4018         struct iscsi_cmd *cmd;
4019         int ret = 0;
4020
4021         switch (hdr->opcode & ISCSI_OPCODE_MASK) {
4022         case ISCSI_OP_SCSI_CMD:
4023                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4024                 if (!cmd)
4025                         goto reject;
4026
4027                 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
4028                 break;
4029         case ISCSI_OP_SCSI_DATA_OUT:
4030                 ret = iscsit_handle_data_out(conn, buf);
4031                 break;
4032         case ISCSI_OP_NOOP_OUT:
4033                 cmd = NULL;
4034                 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
4035                         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4036                         if (!cmd)
4037                                 goto reject;
4038                 }
4039                 ret = iscsit_handle_nop_out(conn, cmd, buf);
4040                 break;
4041         case ISCSI_OP_SCSI_TMFUNC:
4042                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4043                 if (!cmd)
4044                         goto reject;
4045
4046                 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
4047                 break;
4048         case ISCSI_OP_TEXT:
4049                 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
4050                         cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
4051                         if (!cmd)
4052                                 goto reject;
4053                 } else {
4054                         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4055                         if (!cmd)
4056                                 goto reject;
4057                 }
4058
4059                 ret = iscsit_handle_text_cmd(conn, cmd, buf);
4060                 break;
4061         case ISCSI_OP_LOGOUT:
4062                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4063                 if (!cmd)
4064                         goto reject;
4065
4066                 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
4067                 if (ret > 0)
4068                         wait_for_completion_timeout(&conn->conn_logout_comp,
4069                                         SECONDS_FOR_LOGOUT_COMP * HZ);
4070                 break;
4071         case ISCSI_OP_SNACK:
4072                 ret = iscsit_handle_snack(conn, buf);
4073                 break;
4074         default:
4075                 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
4076                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
4077                         pr_err("Cannot recover from unknown"
4078                         " opcode while ERL=0, closing iSCSI connection.\n");
4079                         return -1;
4080                 }
4081                 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
4082                        " closing iSCSI connection.\n");
4083                 ret = -1;
4084                 break;
4085         }
4086
4087         return ret;
4088 reject:
4089         return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
4090 }
4091
4092 static bool iscsi_target_check_conn_state(struct iscsi_conn *conn)
4093 {
4094         bool ret;
4095
4096         spin_lock_bh(&conn->state_lock);
4097         ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN);
4098         spin_unlock_bh(&conn->state_lock);
4099
4100         return ret;
4101 }
4102
4103 int iscsi_target_rx_thread(void *arg)
4104 {
4105         int ret, rc;
4106         u8 buffer[ISCSI_HDR_LEN], opcode;
4107         u32 checksum = 0, digest = 0;
4108         struct iscsi_conn *conn = arg;
4109         struct kvec iov;
4110         bool conn_freed = false;
4111         /*
4112          * Allow ourselves to be interrupted by SIGINT so that a
4113          * connection recovery / failure event can be triggered externally.
4114          */
4115         allow_signal(SIGINT);
4116         /*
4117          * Wait for iscsi_post_login_handler() to complete before allowing
4118          * incoming iscsi/tcp socket I/O, and/or failing the connection.
4119          */
4120         rc = wait_for_completion_interruptible(&conn->rx_login_comp);
4121         if (rc < 0 || iscsi_target_check_conn_state(conn))
4122                 goto out;
4123
4124         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) {
4125                 struct completion comp;
4126
4127                 init_completion(&comp);
4128                 rc = wait_for_completion_interruptible(&comp);
4129                 if (rc < 0)
4130                         goto transport_err;
4131
4132                 goto transport_err;
4133         }
4134
4135         while (!kthread_should_stop()) {
4136                 /*
4137                  * Ensure that both TX and RX per connection kthreads
4138                  * are scheduled to run on the same CPU.
4139                  */
4140                 iscsit_thread_check_cpumask(conn, current, 0);
4141
4142                 memset(buffer, 0, ISCSI_HDR_LEN);
4143                 memset(&iov, 0, sizeof(struct kvec));
4144
4145                 iov.iov_base    = buffer;
4146                 iov.iov_len     = ISCSI_HDR_LEN;
4147
4148                 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
4149                 if (ret != ISCSI_HDR_LEN) {
4150                         iscsit_rx_thread_wait_for_tcp(conn);
4151                         goto transport_err;
4152                 }
4153
4154                 if (conn->conn_ops->HeaderDigest) {
4155                         iov.iov_base    = &digest;
4156                         iov.iov_len     = ISCSI_CRC_LEN;
4157
4158                         ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
4159                         if (ret != ISCSI_CRC_LEN) {
4160                                 iscsit_rx_thread_wait_for_tcp(conn);
4161                                 goto transport_err;
4162                         }
4163
4164                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
4165                                         buffer, ISCSI_HDR_LEN,
4166                                         0, NULL, (u8 *)&checksum);
4167
4168                         if (digest != checksum) {
4169                                 pr_err("HeaderDigest CRC32C failed,"
4170                                         " received 0x%08x, computed 0x%08x\n",
4171                                         digest, checksum);
4172                                 /*
4173                                  * Set the PDU to 0xff so it will intentionally
4174                                  * hit default in the switch below.
4175                                  */
4176                                 memset(buffer, 0xff, ISCSI_HDR_LEN);
4177                                 atomic_long_inc(&conn->sess->conn_digest_errors);
4178                         } else {
4179                                 pr_debug("Got HeaderDigest CRC32C"
4180                                                 " 0x%08x\n", checksum);
4181                         }
4182                 }
4183
4184                 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4185                         goto transport_err;
4186
4187                 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4188
4189                 if (conn->sess->sess_ops->SessionType &&
4190                    ((!(opcode & ISCSI_OP_TEXT)) ||
4191                     (!(opcode & ISCSI_OP_LOGOUT)))) {
4192                         pr_err("Received illegal iSCSI Opcode: 0x%02x"
4193                         " while in Discovery Session, rejecting.\n", opcode);
4194                         iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4195                                           buffer);
4196                         goto transport_err;
4197                 }
4198
4199                 ret = iscsi_target_rx_opcode(conn, buffer);
4200                 if (ret < 0)
4201                         goto transport_err;
4202         }
4203
4204 transport_err:
4205         if (!signal_pending(current))
4206                 atomic_set(&conn->transport_failed, 1);
4207         iscsit_take_action_for_connection_exit(conn, &conn_freed);
4208 out:
4209         if (!conn_freed) {
4210                 while (!kthread_should_stop()) {
4211                         msleep(100);
4212                 }
4213         }
4214         return 0;
4215 }
4216
4217 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4218 {
4219         LIST_HEAD(tmp_list);
4220         struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4221         struct iscsi_session *sess = conn->sess;
4222         /*
4223          * We expect this function to only ever be called from either RX or TX
4224          * thread context via iscsit_close_connection() once the other context
4225          * has been reset -> returned sleeping pre-handler state.
4226          */
4227         spin_lock_bh(&conn->cmd_lock);
4228         list_splice_init(&conn->conn_cmd_list, &tmp_list);
4229
4230         list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4231                 struct se_cmd *se_cmd = &cmd->se_cmd;
4232
4233                 if (se_cmd->se_tfo != NULL) {
4234                         spin_lock_irq(&se_cmd->t_state_lock);
4235                         if (se_cmd->transport_state & CMD_T_ABORTED) {
4236                                 /*
4237                                  * LIO's abort path owns the cleanup for this,
4238                                  * so put it back on the list and let
4239                                  * aborted_task handle it.
4240                                  */
4241                                 list_move_tail(&cmd->i_conn_node,
4242                                                &conn->conn_cmd_list);
4243                         } else {
4244                                 se_cmd->transport_state |= CMD_T_FABRIC_STOP;
4245                         }
4246                         spin_unlock_irq(&se_cmd->t_state_lock);
4247                 }
4248         }
4249         spin_unlock_bh(&conn->cmd_lock);
4250
4251         list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4252                 list_del_init(&cmd->i_conn_node);
4253
4254                 iscsit_increment_maxcmdsn(cmd, sess);
4255                 iscsit_free_cmd(cmd, true);
4256
4257         }
4258 }
4259
4260 static void iscsit_stop_timers_for_cmds(
4261         struct iscsi_conn *conn)
4262 {
4263         struct iscsi_cmd *cmd;
4264
4265         spin_lock_bh(&conn->cmd_lock);
4266         list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4267                 if (cmd->data_direction == DMA_TO_DEVICE)
4268                         iscsit_stop_dataout_timer(cmd);
4269         }
4270         spin_unlock_bh(&conn->cmd_lock);
4271 }
4272
4273 int iscsit_close_connection(
4274         struct iscsi_conn *conn)
4275 {
4276         int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4277         struct iscsi_session    *sess = conn->sess;
4278
4279         pr_debug("Closing iSCSI connection CID %hu on SID:"
4280                 " %u\n", conn->cid, sess->sid);
4281         /*
4282          * Always up conn_logout_comp for the traditional TCP case just in case
4283          * the RX Thread in iscsi_target_rx_opcode() is sleeping and the logout
4284          * response never got sent because the connection failed.
4285          *
4286          * However for iser-target, isert_wait4logout() is using conn_logout_comp
4287          * to signal logout response TX interrupt completion.  Go ahead and skip
4288          * this for iser since isert_rx_opcode() does not wait on logout failure,
4289          * and to avoid iscsi_conn pointer dereference in iser-target code.
4290          */
4291         if (conn->conn_transport->transport_type == ISCSI_TCP)
4292                 complete(&conn->conn_logout_comp);
4293
4294         if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4295                 if (conn->tx_thread &&
4296                     cmpxchg(&conn->tx_thread_active, true, false)) {
4297                         send_sig(SIGINT, conn->tx_thread, 1);
4298                         kthread_stop(conn->tx_thread);
4299                 }
4300         } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4301                 if (conn->rx_thread &&
4302                     cmpxchg(&conn->rx_thread_active, true, false)) {
4303                         send_sig(SIGINT, conn->rx_thread, 1);
4304                         kthread_stop(conn->rx_thread);
4305                 }
4306         }
4307
4308         spin_lock(&iscsit_global->ts_bitmap_lock);
4309         bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4310                               get_order(1));
4311         spin_unlock(&iscsit_global->ts_bitmap_lock);
4312
4313         iscsit_stop_timers_for_cmds(conn);
4314         iscsit_stop_nopin_response_timer(conn);
4315         iscsit_stop_nopin_timer(conn);
4316
4317         if (conn->conn_transport->iscsit_wait_conn)
4318                 conn->conn_transport->iscsit_wait_conn(conn);
4319
4320         /*
4321          * During Connection recovery drop unacknowledged out of order
4322          * commands for this connection, and prepare the other commands
4323          * for realligence.
4324          *
4325          * During normal operation clear the out of order commands (but
4326          * do not free the struct iscsi_ooo_cmdsn's) and release all
4327          * struct iscsi_cmds.
4328          */
4329         if (atomic_read(&conn->connection_recovery)) {
4330                 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4331                 iscsit_prepare_cmds_for_realligance(conn);
4332         } else {
4333                 iscsit_clear_ooo_cmdsns_for_conn(conn);
4334                 iscsit_release_commands_from_conn(conn);
4335         }
4336         iscsit_free_queue_reqs_for_conn(conn);
4337
4338         /*
4339          * Handle decrementing session or connection usage count if
4340          * a logout response was not able to be sent because the
4341          * connection failed.  Fall back to Session Recovery here.
4342          */
4343         if (atomic_read(&conn->conn_logout_remove)) {
4344                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4345                         iscsit_dec_conn_usage_count(conn);
4346                         iscsit_dec_session_usage_count(sess);
4347                 }
4348                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4349                         iscsit_dec_conn_usage_count(conn);
4350
4351                 atomic_set(&conn->conn_logout_remove, 0);
4352                 atomic_set(&sess->session_reinstatement, 0);
4353                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4354         }
4355
4356         spin_lock_bh(&sess->conn_lock);
4357         list_del(&conn->conn_list);
4358
4359         /*
4360          * Attempt to let the Initiator know this connection failed by
4361          * sending an Connection Dropped Async Message on another
4362          * active connection.
4363          */
4364         if (atomic_read(&conn->connection_recovery))
4365                 iscsit_build_conn_drop_async_message(conn);
4366
4367         spin_unlock_bh(&sess->conn_lock);
4368
4369         /*
4370          * If connection reinstatement is being performed on this connection,
4371          * up the connection reinstatement semaphore that is being blocked on
4372          * in iscsit_cause_connection_reinstatement().
4373          */
4374         spin_lock_bh(&conn->state_lock);
4375         if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4376                 spin_unlock_bh(&conn->state_lock);
4377                 complete(&conn->conn_wait_comp);
4378                 wait_for_completion(&conn->conn_post_wait_comp);
4379                 spin_lock_bh(&conn->state_lock);
4380         }
4381
4382         /*
4383          * If connection reinstatement is being performed on this connection
4384          * by receiving a REMOVECONNFORRECOVERY logout request, up the
4385          * connection wait rcfr semaphore that is being blocked on
4386          * an iscsit_connection_reinstatement_rcfr().
4387          */
4388         if (atomic_read(&conn->connection_wait_rcfr)) {
4389                 spin_unlock_bh(&conn->state_lock);
4390                 complete(&conn->conn_wait_rcfr_comp);
4391                 wait_for_completion(&conn->conn_post_wait_comp);
4392                 spin_lock_bh(&conn->state_lock);
4393         }
4394         atomic_set(&conn->connection_reinstatement, 1);
4395         spin_unlock_bh(&conn->state_lock);
4396
4397         /*
4398          * If any other processes are accessing this connection pointer we
4399          * must wait until they have completed.
4400          */
4401         iscsit_check_conn_usage_count(conn);
4402
4403         if (conn->conn_rx_hash.tfm)
4404                 crypto_free_hash(conn->conn_rx_hash.tfm);
4405         if (conn->conn_tx_hash.tfm)
4406                 crypto_free_hash(conn->conn_tx_hash.tfm);
4407
4408         free_cpumask_var(conn->conn_cpumask);
4409
4410         kfree(conn->conn_ops);
4411         conn->conn_ops = NULL;
4412
4413         if (conn->sock)
4414                 sock_release(conn->sock);
4415
4416         if (conn->conn_transport->iscsit_free_conn)
4417                 conn->conn_transport->iscsit_free_conn(conn);
4418
4419         iscsit_put_transport(conn->conn_transport);
4420
4421         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4422         conn->conn_state = TARG_CONN_STATE_FREE;
4423         kfree(conn);
4424
4425         spin_lock_bh(&sess->conn_lock);
4426         atomic_dec(&sess->nconn);
4427         pr_debug("Decremented iSCSI connection count to %hu from node:"
4428                 " %s\n", atomic_read(&sess->nconn),
4429                 sess->sess_ops->InitiatorName);
4430         /*
4431          * Make sure that if one connection fails in an non ERL=2 iSCSI
4432          * Session that they all fail.
4433          */
4434         if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4435              !atomic_read(&sess->session_logout))
4436                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4437
4438         /*
4439          * If this was not the last connection in the session, and we are
4440          * performing session reinstatement or falling back to ERL=0, call
4441          * iscsit_stop_session() without sleeping to shutdown the other
4442          * active connections.
4443          */
4444         if (atomic_read(&sess->nconn)) {
4445                 if (!atomic_read(&sess->session_reinstatement) &&
4446                     !atomic_read(&sess->session_fall_back_to_erl0)) {
4447                         spin_unlock_bh(&sess->conn_lock);
4448                         return 0;
4449                 }
4450                 if (!atomic_read(&sess->session_stop_active)) {
4451                         atomic_set(&sess->session_stop_active, 1);
4452                         spin_unlock_bh(&sess->conn_lock);
4453                         iscsit_stop_session(sess, 0, 0);
4454                         return 0;
4455                 }
4456                 spin_unlock_bh(&sess->conn_lock);
4457                 return 0;
4458         }
4459
4460         /*
4461          * If this was the last connection in the session and one of the
4462          * following is occurring:
4463          *
4464          * Session Reinstatement is not being performed, and are falling back
4465          * to ERL=0 call iscsit_close_session().
4466          *
4467          * Session Logout was requested.  iscsit_close_session() will be called
4468          * elsewhere.
4469          *
4470          * Session Continuation is not being performed, start the Time2Retain
4471          * handler and check if sleep_on_sess_wait_sem is active.
4472          */
4473         if (!atomic_read(&sess->session_reinstatement) &&
4474              atomic_read(&sess->session_fall_back_to_erl0)) {
4475                 spin_unlock_bh(&sess->conn_lock);
4476                 target_put_session(sess->se_sess);
4477
4478                 return 0;
4479         } else if (atomic_read(&sess->session_logout)) {
4480                 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4481                 sess->session_state = TARG_SESS_STATE_FREE;
4482                 spin_unlock_bh(&sess->conn_lock);
4483
4484                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4485                         complete(&sess->session_wait_comp);
4486
4487                 return 0;
4488         } else {
4489                 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4490                 sess->session_state = TARG_SESS_STATE_FAILED;
4491
4492                 if (!atomic_read(&sess->session_continuation)) {
4493                         spin_unlock_bh(&sess->conn_lock);
4494                         iscsit_start_time2retain_handler(sess);
4495                 } else
4496                         spin_unlock_bh(&sess->conn_lock);
4497
4498                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4499                         complete(&sess->session_wait_comp);
4500
4501                 return 0;
4502         }
4503         spin_unlock_bh(&sess->conn_lock);
4504
4505         return 0;
4506 }
4507
4508 int iscsit_close_session(struct iscsi_session *sess)
4509 {
4510         struct iscsi_portal_group *tpg = sess->tpg;
4511         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4512
4513         if (atomic_read(&sess->nconn)) {
4514                 pr_err("%d connection(s) still exist for iSCSI session"
4515                         " to %s\n", atomic_read(&sess->nconn),
4516                         sess->sess_ops->InitiatorName);
4517                 BUG();
4518         }
4519
4520         spin_lock_bh(&se_tpg->session_lock);
4521         atomic_set(&sess->session_logout, 1);
4522         atomic_set(&sess->session_reinstatement, 1);
4523         iscsit_stop_time2retain_timer(sess);
4524         spin_unlock_bh(&se_tpg->session_lock);
4525
4526         /*
4527          * transport_deregister_session_configfs() will clear the
4528          * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4529          * can be setting it again with __transport_register_session() in
4530          * iscsi_post_login_handler() again after the iscsit_stop_session()
4531          * completes in iscsi_np context.
4532          */
4533         transport_deregister_session_configfs(sess->se_sess);
4534
4535         /*
4536          * If any other processes are accessing this session pointer we must
4537          * wait until they have completed.  If we are in an interrupt (the
4538          * time2retain handler) and contain and active session usage count we
4539          * restart the timer and exit.
4540          */
4541         if (!in_interrupt()) {
4542                 if (iscsit_check_session_usage_count(sess) == 1)
4543                         iscsit_stop_session(sess, 1, 1);
4544         } else {
4545                 if (iscsit_check_session_usage_count(sess) == 2) {
4546                         atomic_set(&sess->session_logout, 0);
4547                         iscsit_start_time2retain_handler(sess);
4548                         return 0;
4549                 }
4550         }
4551
4552         transport_deregister_session(sess->se_sess);
4553
4554         if (sess->sess_ops->ErrorRecoveryLevel == 2)
4555                 iscsit_free_connection_recovery_entires(sess);
4556
4557         iscsit_free_all_ooo_cmdsns(sess);
4558
4559         spin_lock_bh(&se_tpg->session_lock);
4560         pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4561         sess->session_state = TARG_SESS_STATE_FREE;
4562         pr_debug("Released iSCSI session from node: %s\n",
4563                         sess->sess_ops->InitiatorName);
4564         tpg->nsessions--;
4565         if (tpg->tpg_tiqn)
4566                 tpg->tpg_tiqn->tiqn_nsessions--;
4567
4568         pr_debug("Decremented number of active iSCSI Sessions on"
4569                 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4570
4571         spin_lock(&sess_idr_lock);
4572         idr_remove(&sess_idr, sess->session_index);
4573         spin_unlock(&sess_idr_lock);
4574
4575         kfree(sess->sess_ops);
4576         sess->sess_ops = NULL;
4577         spin_unlock_bh(&se_tpg->session_lock);
4578
4579         kfree(sess);
4580         return 0;
4581 }
4582
4583 static void iscsit_logout_post_handler_closesession(
4584         struct iscsi_conn *conn)
4585 {
4586         struct iscsi_session *sess = conn->sess;
4587         int sleep = 1;
4588         /*
4589          * Traditional iscsi/tcp will invoke this logic from TX thread
4590          * context during session logout, so clear tx_thread_active and
4591          * sleep if iscsit_close_connection() has not already occured.
4592          *
4593          * Since iser-target invokes this logic from it's own workqueue,
4594          * always sleep waiting for RX/TX thread shutdown to complete
4595          * within iscsit_close_connection().
4596          */
4597         if (conn->conn_transport->transport_type == ISCSI_TCP) {
4598                 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4599                 if (!sleep)
4600                         return;
4601         }
4602
4603         atomic_set(&conn->conn_logout_remove, 0);
4604         complete(&conn->conn_logout_comp);
4605
4606         iscsit_dec_conn_usage_count(conn);
4607         iscsit_stop_session(sess, sleep, sleep);
4608         iscsit_dec_session_usage_count(sess);
4609         target_put_session(sess->se_sess);
4610 }
4611
4612 static void iscsit_logout_post_handler_samecid(
4613         struct iscsi_conn *conn)
4614 {
4615         int sleep = 1;
4616
4617         if (conn->conn_transport->transport_type == ISCSI_TCP) {
4618                 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4619                 if (!sleep)
4620                         return;
4621         }
4622
4623         atomic_set(&conn->conn_logout_remove, 0);
4624         complete(&conn->conn_logout_comp);
4625
4626         iscsit_cause_connection_reinstatement(conn, sleep);
4627         iscsit_dec_conn_usage_count(conn);
4628 }
4629
4630 static void iscsit_logout_post_handler_diffcid(
4631         struct iscsi_conn *conn,
4632         u16 cid)
4633 {
4634         struct iscsi_conn *l_conn;
4635         struct iscsi_session *sess = conn->sess;
4636         bool conn_found = false;
4637
4638         if (!sess)
4639                 return;
4640
4641         spin_lock_bh(&sess->conn_lock);
4642         list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4643                 if (l_conn->cid == cid) {
4644                         iscsit_inc_conn_usage_count(l_conn);
4645                         conn_found = true;
4646                         break;
4647                 }
4648         }
4649         spin_unlock_bh(&sess->conn_lock);
4650
4651         if (!conn_found)
4652                 return;
4653
4654         if (l_conn->sock)
4655                 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4656
4657         spin_lock_bh(&l_conn->state_lock);
4658         pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4659         l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4660         spin_unlock_bh(&l_conn->state_lock);
4661
4662         iscsit_cause_connection_reinstatement(l_conn, 1);
4663         iscsit_dec_conn_usage_count(l_conn);
4664 }
4665
4666 /*
4667  *      Return of 0 causes the TX thread to restart.
4668  */
4669 int iscsit_logout_post_handler(
4670         struct iscsi_cmd *cmd,
4671         struct iscsi_conn *conn)
4672 {
4673         int ret = 0;
4674
4675         switch (cmd->logout_reason) {
4676         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4677                 switch (cmd->logout_response) {
4678                 case ISCSI_LOGOUT_SUCCESS:
4679                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4680                 default:
4681                         iscsit_logout_post_handler_closesession(conn);
4682                         break;
4683                 }
4684                 ret = 0;
4685                 break;
4686         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4687                 if (conn->cid == cmd->logout_cid) {
4688                         switch (cmd->logout_response) {
4689                         case ISCSI_LOGOUT_SUCCESS:
4690                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4691                         default:
4692                                 iscsit_logout_post_handler_samecid(conn);
4693                                 break;
4694                         }
4695                         ret = 0;
4696                 } else {
4697                         switch (cmd->logout_response) {
4698                         case ISCSI_LOGOUT_SUCCESS:
4699                                 iscsit_logout_post_handler_diffcid(conn,
4700                                         cmd->logout_cid);
4701                                 break;
4702                         case ISCSI_LOGOUT_CID_NOT_FOUND:
4703                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4704                         default:
4705                                 break;
4706                         }
4707                         ret = 1;
4708                 }
4709                 break;
4710         case ISCSI_LOGOUT_REASON_RECOVERY:
4711                 switch (cmd->logout_response) {
4712                 case ISCSI_LOGOUT_SUCCESS:
4713                 case ISCSI_LOGOUT_CID_NOT_FOUND:
4714                 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4715                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4716                 default:
4717                         break;
4718                 }
4719                 ret = 1;
4720                 break;
4721         default:
4722                 break;
4723
4724         }
4725         return ret;
4726 }
4727 EXPORT_SYMBOL(iscsit_logout_post_handler);
4728
4729 void iscsit_fail_session(struct iscsi_session *sess)
4730 {
4731         struct iscsi_conn *conn;
4732
4733         spin_lock_bh(&sess->conn_lock);
4734         list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4735                 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4736                 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4737         }
4738         spin_unlock_bh(&sess->conn_lock);
4739
4740         pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4741         sess->session_state = TARG_SESS_STATE_FAILED;
4742 }
4743
4744 int iscsit_free_session(struct iscsi_session *sess)
4745 {
4746         u16 conn_count = atomic_read(&sess->nconn);
4747         struct iscsi_conn *conn, *conn_tmp = NULL;
4748         int is_last;
4749
4750         spin_lock_bh(&sess->conn_lock);
4751         atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4752
4753         list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4754                         conn_list) {
4755                 if (conn_count == 0)
4756                         break;
4757
4758                 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4759                         is_last = 1;
4760                 } else {
4761                         iscsit_inc_conn_usage_count(conn_tmp);
4762                         is_last = 0;
4763                 }
4764                 iscsit_inc_conn_usage_count(conn);
4765
4766                 spin_unlock_bh(&sess->conn_lock);
4767                 iscsit_cause_connection_reinstatement(conn, 1);
4768                 spin_lock_bh(&sess->conn_lock);
4769
4770                 iscsit_dec_conn_usage_count(conn);
4771                 if (is_last == 0)
4772                         iscsit_dec_conn_usage_count(conn_tmp);
4773
4774                 conn_count--;
4775         }
4776
4777         if (atomic_read(&sess->nconn)) {
4778                 spin_unlock_bh(&sess->conn_lock);
4779                 wait_for_completion(&sess->session_wait_comp);
4780         } else
4781                 spin_unlock_bh(&sess->conn_lock);
4782
4783         target_put_session(sess->se_sess);
4784         return 0;
4785 }
4786
4787 void iscsit_stop_session(
4788         struct iscsi_session *sess,
4789         int session_sleep,
4790         int connection_sleep)
4791 {
4792         u16 conn_count = atomic_read(&sess->nconn);
4793         struct iscsi_conn *conn, *conn_tmp = NULL;
4794         int is_last;
4795
4796         spin_lock_bh(&sess->conn_lock);
4797         if (session_sleep)
4798                 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4799
4800         if (connection_sleep) {
4801                 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4802                                 conn_list) {
4803                         if (conn_count == 0)
4804                                 break;
4805
4806                         if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4807                                 is_last = 1;
4808                         } else {
4809                                 iscsit_inc_conn_usage_count(conn_tmp);
4810                                 is_last = 0;
4811                         }
4812                         iscsit_inc_conn_usage_count(conn);
4813
4814                         spin_unlock_bh(&sess->conn_lock);
4815                         iscsit_cause_connection_reinstatement(conn, 1);
4816                         spin_lock_bh(&sess->conn_lock);
4817
4818                         iscsit_dec_conn_usage_count(conn);
4819                         if (is_last == 0)
4820                                 iscsit_dec_conn_usage_count(conn_tmp);
4821                         conn_count--;
4822                 }
4823         } else {
4824                 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4825                         iscsit_cause_connection_reinstatement(conn, 0);
4826         }
4827
4828         if (session_sleep && atomic_read(&sess->nconn)) {
4829                 spin_unlock_bh(&sess->conn_lock);
4830                 wait_for_completion(&sess->session_wait_comp);
4831         } else
4832                 spin_unlock_bh(&sess->conn_lock);
4833 }
4834
4835 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4836 {
4837         struct iscsi_session *sess;
4838         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4839         struct se_session *se_sess, *se_sess_tmp;
4840         LIST_HEAD(free_list);
4841         int session_count = 0;
4842
4843         spin_lock_bh(&se_tpg->session_lock);
4844         if (tpg->nsessions && !force) {
4845                 spin_unlock_bh(&se_tpg->session_lock);
4846                 return -1;
4847         }
4848
4849         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4850                         sess_list) {
4851                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4852
4853                 spin_lock(&sess->conn_lock);
4854                 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4855                     atomic_read(&sess->session_logout) ||
4856                     (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4857                         spin_unlock(&sess->conn_lock);
4858                         continue;
4859                 }
4860                 atomic_set(&sess->session_reinstatement, 1);
4861                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4862                 spin_unlock(&sess->conn_lock);
4863
4864                 list_move_tail(&se_sess->sess_list, &free_list);
4865         }
4866         spin_unlock_bh(&se_tpg->session_lock);
4867
4868         list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
4869                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4870
4871                 iscsit_free_session(sess);
4872                 session_count++;
4873         }
4874
4875         pr_debug("Released %d iSCSI Session(s) from Target Portal"
4876                         " Group: %hu\n", session_count, tpg->tpgt);
4877         return 0;
4878 }
4879
4880 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4881 MODULE_VERSION("4.1.x");
4882 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4883 MODULE_LICENSE("GPL");
4884
4885 module_init(iscsi_target_init_module);
4886 module_exit(iscsi_target_cleanup_module);