drivers/target/iscsi/iscsi_target.c

   1 /*******************************************************************************
   2  * This file contains main functions related to the iSCSI Target Core Driver.
   3  *
   4  * (c) Copyright 2007-2013 Datera, Inc.
   5  *
   6  * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  ******************************************************************************/
  18
  19 #include <linux/string.h>
  20 #include <linux/kthread.h>
  21 #include <linux/crypto.h>
  22 #include <linux/completion.h>
  23 #include <linux/module.h>
  24 #include <linux/idr.h>
  25 #include <asm/unaligned.h>
  26 #include <scsi/scsi_device.h>
  27 #include <scsi/iscsi_proto.h>
  28 #include <scsi/scsi_tcq.h>
  29 #include <target/target_core_base.h>
  30 #include <target/target_core_fabric.h>
  31 #include <target/target_core_configfs.h>
  32
  33 #include "iscsi_target_core.h"
  34 #include "iscsi_target_parameters.h"
  35 #include "iscsi_target_seq_pdu_list.h"
  36 #include "iscsi_target_tq.h"
  37 #include "iscsi_target_configfs.h"
  38 #include "iscsi_target_datain_values.h"
  39 #include "iscsi_target_erl0.h"
  40 #include "iscsi_target_erl1.h"
  41 #include "iscsi_target_erl2.h"
  42 #include "iscsi_target_login.h"
  43 #include "iscsi_target_tmr.h"
  44 #include "iscsi_target_tpg.h"
  45 #include "iscsi_target_util.h"
  46 #include "iscsi_target.h"
  47 #include "iscsi_target_device.h"
  48 #include "iscsi_target_stat.h"
  49
  50 #include <target/iscsi/iscsi_transport.h>
  51
  52 static LIST_HEAD(g_tiqn_list);
  53 static LIST_HEAD(g_np_list);
  54 static DEFINE_SPINLOCK(tiqn_lock);
  55 static DEFINE_MUTEX(np_lock);
  56
  57 static struct idr tiqn_idr;
  58 struct idr sess_idr;
  59 struct mutex auth_id_lock;
  60 spinlock_t sess_idr_lock;
  61
  62 struct iscsit_global *iscsit_global;
  63
  64 struct kmem_cache *lio_qr_cache;
  65 struct kmem_cache *lio_dr_cache;
  66 struct kmem_cache *lio_ooo_cache;
  67 struct kmem_cache *lio_r2t_cache;
  68
  69 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
  70                         struct iscsi_scsi_req *, u32);
  71
  72 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
  73 {
  74         struct iscsi_tiqn *tiqn = NULL;
  75
  76         spin_lock(&tiqn_lock);
  77         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
  78                 if (!strcmp(tiqn->tiqn, buf)) {
  79
  80                         spin_lock(&tiqn->tiqn_state_lock);
  81                         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
  82                                 tiqn->tiqn_access_count++;
  83                                 spin_unlock(&tiqn->tiqn_state_lock);
  84                                 spin_unlock(&tiqn_lock);
  85                                 return tiqn;
  86                         }
  87                         spin_unlock(&tiqn->tiqn_state_lock);
  88                 }
  89         }
  90         spin_unlock(&tiqn_lock);
  91
  92         return NULL;
  93 }
  94
  95 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
  96 {
  97         spin_lock(&tiqn->tiqn_state_lock);
  98         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
  99                 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
 100                 spin_unlock(&tiqn->tiqn_state_lock);
 101                 return 0;
 102         }
 103         spin_unlock(&tiqn->tiqn_state_lock);
 104
 105         return -1;
 106 }
 107
 108 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
 109 {
 110         spin_lock(&tiqn->tiqn_state_lock);
 111         tiqn->tiqn_access_count--;
 112         spin_unlock(&tiqn->tiqn_state_lock);
 113 }
 114
 115 /*
 116  * Note that IQN formatting is expected to be done in userspace, and
 117  * no explict IQN format checks are done here.
 118  */
 119 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
 120 {
 121         struct iscsi_tiqn *tiqn = NULL;
 122         int ret;
 123
 124         if (strlen(buf) >= ISCSI_IQN_LEN) {
 125                 pr_err("Target IQN exceeds %d bytes\n",
 126                                 ISCSI_IQN_LEN);
 127                 return ERR_PTR(-EINVAL);
 128         }
 129
 130         tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL);
 131         if (!tiqn) {
 132                 pr_err("Unable to allocate struct iscsi_tiqn\n");
 133                 return ERR_PTR(-ENOMEM);
 134         }
 135
 136         sprintf(tiqn->tiqn, "%s", buf);
 137         INIT_LIST_HEAD(&tiqn->tiqn_list);
 138         INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
 139         spin_lock_init(&tiqn->tiqn_state_lock);
 140         spin_lock_init(&tiqn->tiqn_tpg_lock);
 141         spin_lock_init(&tiqn->sess_err_stats.lock);
 142         spin_lock_init(&tiqn->login_stats.lock);
 143         spin_lock_init(&tiqn->logout_stats.lock);
 144
 145         tiqn->tiqn_state = TIQN_STATE_ACTIVE;
 146
 147         idr_preload(GFP_KERNEL);
 148         spin_lock(&tiqn_lock);
 149
 150         ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
 151         if (ret < 0) {
 152                 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
 153                 spin_unlock(&tiqn_lock);
 154                 idr_preload_end();
 155                 kfree(tiqn);
 156                 return ERR_PTR(ret);
 157         }
 158         tiqn->tiqn_index = ret;
 159         list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
 160
 161         spin_unlock(&tiqn_lock);
 162         idr_preload_end();
 163
 164         pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
 165
 166         return tiqn;
 167
 168 }
 169
 170 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
 171 {
 172         /*
 173          * Wait for accesses to said struct iscsi_tiqn to end.
 174          */
 175         spin_lock(&tiqn->tiqn_state_lock);
 176         while (tiqn->tiqn_access_count != 0) {
 177                 spin_unlock(&tiqn->tiqn_state_lock);
 178                 msleep(10);
 179                 spin_lock(&tiqn->tiqn_state_lock);
 180         }
 181         spin_unlock(&tiqn->tiqn_state_lock);
 182 }
 183
 184 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
 185 {
 186         /*
 187          * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
 188          * while holding tiqn->tiqn_state_lock.  This means that all subsequent
 189          * attempts to access this struct iscsi_tiqn will fail from both transport
 190          * fabric and control code paths.
 191          */
 192         if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
 193                 pr_err("iscsit_set_tiqn_shutdown() failed\n");
 194                 return;
 195         }
 196
 197         iscsit_wait_for_tiqn(tiqn);
 198
 199         spin_lock(&tiqn_lock);
 200         list_del(&tiqn->tiqn_list);
 201         idr_remove(&tiqn_idr, tiqn->tiqn_index);
 202         spin_unlock(&tiqn_lock);
 203
 204         pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
 205                         tiqn->tiqn);
 206         kfree(tiqn);
 207 }
 208
 209 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
 210 {
 211         int ret;
 212         /*
 213          * Determine if the network portal is accepting storage traffic.
 214          */
 215         spin_lock_bh(&np->np_thread_lock);
 216         if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 217                 spin_unlock_bh(&np->np_thread_lock);
 218                 return -1;
 219         }
 220         spin_unlock_bh(&np->np_thread_lock);
 221         /*
 222          * Determine if the portal group is accepting storage traffic.
 223          */
 224         spin_lock_bh(&tpg->tpg_state_lock);
 225         if (tpg->tpg_state != TPG_STATE_ACTIVE) {
 226                 spin_unlock_bh(&tpg->tpg_state_lock);
 227                 return -1;
 228         }
 229         spin_unlock_bh(&tpg->tpg_state_lock);
 230
 231         /*
 232          * Here we serialize access across the TIQN+TPG Tuple.
 233          */
 234         ret = down_interruptible(&tpg->np_login_sem);
 235         if ((ret != 0) || signal_pending(current))
 236                 return -1;
 237
 238         spin_lock_bh(&tpg->tpg_state_lock);
 239         if (tpg->tpg_state != TPG_STATE_ACTIVE) {
 240                 spin_unlock_bh(&tpg->tpg_state_lock);
 241                 up(&tpg->np_login_sem);
 242                 return -1;
 243         }
 244         spin_unlock_bh(&tpg->tpg_state_lock);
 245
 246         return 0;
 247 }
 248
 249 void iscsit_login_kref_put(struct kref *kref)
 250 {
 251         struct iscsi_tpg_np *tpg_np = container_of(kref,
 252                                 struct iscsi_tpg_np, tpg_np_kref);
 253
 254         complete(&tpg_np->tpg_np_comp);
 255 }
 256
 257 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg,
 258                        struct iscsi_tpg_np *tpg_np)
 259 {
 260         struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
 261
 262         up(&tpg->np_login_sem);
 263
 264         if (tpg_np)
 265                 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
 266
 267         if (tiqn)
 268                 iscsit_put_tiqn_for_login(tiqn);
 269
 270         return 0;
 271 }
 272
 273 bool iscsit_check_np_match(
 274         struct __kernel_sockaddr_storage *sockaddr,
 275         struct iscsi_np *np,
 276         int network_transport)
 277 {
 278         struct sockaddr_in *sock_in, *sock_in_e;
 279         struct sockaddr_in6 *sock_in6, *sock_in6_e;
 280         bool ip_match = false;
 281         u16 port;
 282
 283         if (sockaddr->ss_family == AF_INET6) {
 284                 sock_in6 = (struct sockaddr_in6 *)sockaddr;
 285                 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
 286
 287                 if (!memcmp(&sock_in6->sin6_addr.in6_u,
 288                             &sock_in6_e->sin6_addr.in6_u,
 289                             sizeof(struct in6_addr)))
 290                         ip_match = true;
 291
 292                 port = ntohs(sock_in6->sin6_port);
 293         } else {
 294                 sock_in = (struct sockaddr_in *)sockaddr;
 295                 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
 296
 297                 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
 298                         ip_match = true;
 299
 300                 port = ntohs(sock_in->sin_port);
 301         }
 302
 303         if (ip_match && (np->np_port == 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 __kernel_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 __kernel_sockaddr_storage *sockaddr,
 346         char *ip_str,
 347         int network_transport)
 348 {
 349         struct sockaddr_in *sock_in;
 350         struct sockaddr_in6 *sock_in6;
 351         struct iscsi_np *np;
 352         int ret;
 353
 354         mutex_lock(&np_lock);
 355
 356         /*
 357          * Locate the existing struct iscsi_np if already active..
 358          */
 359         np = iscsit_get_np(sockaddr, network_transport);
 360         if (np) {
 361                 mutex_unlock(&np_lock);
 362                 return np;
 363         }
 364
 365         np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
 366         if (!np) {
 367                 pr_err("Unable to allocate memory for struct iscsi_np\n");
 368                 mutex_unlock(&np_lock);
 369                 return ERR_PTR(-ENOMEM);
 370         }
 371
 372         np->np_flags |= NPF_IP_NETWORK;
 373         if (sockaddr->ss_family == AF_INET6) {
 374                 sock_in6 = (struct sockaddr_in6 *)sockaddr;
 375                 snprintf(np->np_ip, IPV6_ADDRESS_SPACE, "%s", ip_str);
 376                 np->np_port = ntohs(sock_in6->sin6_port);
 377         } else {
 378                 sock_in = (struct sockaddr_in *)sockaddr;
 379                 sprintf(np->np_ip, "%s", ip_str);
 380                 np->np_port = ntohs(sock_in->sin_port);
 381         }
 382
 383         np->np_network_transport = network_transport;
 384         spin_lock_init(&np->np_thread_lock);
 385         init_completion(&np->np_restart_comp);
 386         INIT_LIST_HEAD(&np->np_list);
 387
 388         ret = iscsi_target_setup_login_socket(np, sockaddr);
 389         if (ret != 0) {
 390                 kfree(np);
 391                 mutex_unlock(&np_lock);
 392                 return ERR_PTR(ret);
 393         }
 394
 395         np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
 396         if (IS_ERR(np->np_thread)) {
 397                 pr_err("Unable to create kthread: iscsi_np\n");
 398                 ret = PTR_ERR(np->np_thread);
 399                 kfree(np);
 400                 mutex_unlock(&np_lock);
 401                 return ERR_PTR(ret);
 402         }
 403         /*
 404          * Increment the np_exports reference count now to prevent
 405          * iscsit_del_np() below from being run while a new call to
 406          * iscsi_tpg_add_network_portal() for a matching iscsi_np is
 407          * active.  We don't need to hold np->np_thread_lock at this
 408          * point because iscsi_np has not been added to g_np_list yet.
 409          */
 410         np->np_exports = 1;
 411         np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
 412
 413         list_add_tail(&np->np_list, &g_np_list);
 414         mutex_unlock(&np_lock);
 415
 416         pr_debug("CORE[0] - Added Network Portal: %s:%hu on %s\n",
 417                 np->np_ip, np->np_port, np->np_transport->name);
 418
 419         return np;
 420 }
 421
 422 int iscsit_reset_np_thread(
 423         struct iscsi_np *np,
 424         struct iscsi_tpg_np *tpg_np,
 425         struct iscsi_portal_group *tpg,
 426         bool shutdown)
 427 {
 428         spin_lock_bh(&np->np_thread_lock);
 429         if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
 430                 spin_unlock_bh(&np->np_thread_lock);
 431                 return 0;
 432         }
 433         np->np_thread_state = ISCSI_NP_THREAD_RESET;
 434
 435         if (np->np_thread) {
 436                 spin_unlock_bh(&np->np_thread_lock);
 437                 send_sig(SIGINT, np->np_thread, 1);
 438                 wait_for_completion(&np->np_restart_comp);
 439                 spin_lock_bh(&np->np_thread_lock);
 440         }
 441         spin_unlock_bh(&np->np_thread_lock);
 442
 443         if (tpg_np && shutdown) {
 444                 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
 445
 446                 wait_for_completion(&tpg_np->tpg_np_comp);
 447         }
 448
 449         return 0;
 450 }
 451
 452 static void iscsit_free_np(struct iscsi_np *np)
 453 {
 454         if (np->np_socket)
 455                 sock_release(np->np_socket);
 456 }
 457
 458 int iscsit_del_np(struct iscsi_np *np)
 459 {
 460         spin_lock_bh(&np->np_thread_lock);
 461         np->np_exports--;
 462         if (np->np_exports) {
 463                 np->enabled = true;
 464                 spin_unlock_bh(&np->np_thread_lock);
 465                 return 0;
 466         }
 467         np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
 468         spin_unlock_bh(&np->np_thread_lock);
 469
 470         if (np->np_thread) {
 471                 /*
 472                  * We need to send the signal to wakeup Linux/Net
 473                  * which may be sleeping in sock_accept()..
 474                  */
 475                 send_sig(SIGINT, np->np_thread, 1);
 476                 kthread_stop(np->np_thread);
 477                 np->np_thread = NULL;
 478         }
 479
 480         np->np_transport->iscsit_free_np(np);
 481
 482         mutex_lock(&np_lock);
 483         list_del(&np->np_list);
 484         mutex_unlock(&np_lock);
 485
 486         pr_debug("CORE[0] - Removed Network Portal: %s:%hu on %s\n",
 487                 np->np_ip, np->np_port, np->np_transport->name);
 488
 489         iscsit_put_transport(np->np_transport);
 490         kfree(np);
 491         return 0;
 492 }
 493
 494 static int iscsit_immediate_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
 495 static int iscsit_response_queue(struct iscsi_conn *, struct iscsi_cmd *, int);
 496
 497 static int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
 498 {
 499         iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
 500         return 0;
 501 }
 502
 503 static void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
 504 {
 505         bool scsi_cmd = (cmd->iscsi_opcode == ISCSI_OP_SCSI_CMD);
 506
 507         spin_lock_bh(&conn->cmd_lock);
 508         if (!list_empty(&cmd->i_conn_node))
 509                 list_del_init(&cmd->i_conn_node);
 510         spin_unlock_bh(&conn->cmd_lock);
 511
 512         __iscsit_free_cmd(cmd, scsi_cmd, true);
 513 }
 514
 515 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn)
 516 {
 517         return TARGET_PROT_NORMAL;
 518 }
 519
 520 static struct iscsit_transport iscsi_target_transport = {
 521         .name                   = "iSCSI/TCP",
 522         .transport_type         = ISCSI_TCP,
 523         .owner                  = NULL,
 524         .iscsit_setup_np        = iscsit_setup_np,
 525         .iscsit_accept_np       = iscsit_accept_np,
 526         .iscsit_free_np         = iscsit_free_np,
 527         .iscsit_get_login_rx    = iscsit_get_login_rx,
 528         .iscsit_put_login_tx    = iscsit_put_login_tx,
 529         .iscsit_get_dataout     = iscsit_build_r2ts_for_cmd,
 530         .iscsit_immediate_queue = iscsit_immediate_queue,
 531         .iscsit_response_queue  = iscsit_response_queue,
 532         .iscsit_queue_data_in   = iscsit_queue_rsp,
 533         .iscsit_queue_status    = iscsit_queue_rsp,
 534         .iscsit_aborted_task    = iscsit_aborted_task,
 535         .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops,
 536 };
 537
 538 static int __init iscsi_target_init_module(void)
 539 {
 540         int ret = 0;
 541
 542         pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
 543
 544         iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
 545         if (!iscsit_global) {
 546                 pr_err("Unable to allocate memory for iscsit_global\n");
 547                 return -1;
 548         }
 549         mutex_init(&auth_id_lock);
 550         spin_lock_init(&sess_idr_lock);
 551         idr_init(&tiqn_idr);
 552         idr_init(&sess_idr);
 553
 554         ret = iscsi_target_register_configfs();
 555         if (ret < 0)
 556                 goto out;
 557
 558         ret = iscsi_thread_set_init();
 559         if (ret < 0)
 560                 goto configfs_out;
 561
 562         if (iscsi_allocate_thread_sets(TARGET_THREAD_SET_COUNT) !=
 563                         TARGET_THREAD_SET_COUNT) {
 564                 pr_err("iscsi_allocate_thread_sets() returned"
 565                         " unexpected value!\n");
 566                 goto ts_out1;
 567         }
 568
 569         lio_qr_cache = kmem_cache_create("lio_qr_cache",
 570                         sizeof(struct iscsi_queue_req),
 571                         __alignof__(struct iscsi_queue_req), 0, NULL);
 572         if (!lio_qr_cache) {
 573                 pr_err("nable to kmem_cache_create() for"
 574                                 " lio_qr_cache\n");
 575                 goto ts_out2;
 576         }
 577
 578         lio_dr_cache = kmem_cache_create("lio_dr_cache",
 579                         sizeof(struct iscsi_datain_req),
 580                         __alignof__(struct iscsi_datain_req), 0, NULL);
 581         if (!lio_dr_cache) {
 582                 pr_err("Unable to kmem_cache_create() for"
 583                                 " lio_dr_cache\n");
 584                 goto qr_out;
 585         }
 586
 587         lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
 588                         sizeof(struct iscsi_ooo_cmdsn),
 589                         __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
 590         if (!lio_ooo_cache) {
 591                 pr_err("Unable to kmem_cache_create() for"
 592                                 " lio_ooo_cache\n");
 593                 goto dr_out;
 594         }
 595
 596         lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
 597                         sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
 598                         0, NULL);
 599         if (!lio_r2t_cache) {
 600                 pr_err("Unable to kmem_cache_create() for"
 601                                 " lio_r2t_cache\n");
 602                 goto ooo_out;
 603         }
 604
 605         iscsit_register_transport(&iscsi_target_transport);
 606
 607         if (iscsit_load_discovery_tpg() < 0)
 608                 goto r2t_out;
 609
 610         return ret;
 611 r2t_out:
 612         kmem_cache_destroy(lio_r2t_cache);
 613 ooo_out:
 614         kmem_cache_destroy(lio_ooo_cache);
 615 dr_out:
 616         kmem_cache_destroy(lio_dr_cache);
 617 qr_out:
 618         kmem_cache_destroy(lio_qr_cache);
 619 ts_out2:
 620         iscsi_deallocate_thread_sets();
 621 ts_out1:
 622         iscsi_thread_set_free();
 623 configfs_out:
 624         iscsi_target_deregister_configfs();
 625 out:
 626         kfree(iscsit_global);
 627         return -ENOMEM;
 628 }
 629
 630 static void __exit iscsi_target_cleanup_module(void)
 631 {
 632         iscsi_deallocate_thread_sets();
 633         iscsi_thread_set_free();
 634         iscsit_release_discovery_tpg();
 635         iscsit_unregister_transport(&iscsi_target_transport);
 636         kmem_cache_destroy(lio_qr_cache);
 637         kmem_cache_destroy(lio_dr_cache);
 638         kmem_cache_destroy(lio_ooo_cache);
 639         kmem_cache_destroy(lio_r2t_cache);
 640
 641         iscsi_target_deregister_configfs();
 642
 643         kfree(iscsit_global);
 644 }
 645
 646 static int iscsit_add_reject(
 647         struct iscsi_conn *conn,
 648         u8 reason,
 649         unsigned char *buf)
 650 {
 651         struct iscsi_cmd *cmd;
 652
 653         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
 654         if (!cmd)
 655                 return -1;
 656
 657         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 658         cmd->reject_reason = reason;
 659
 660         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 661         if (!cmd->buf_ptr) {
 662                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 663                 iscsit_free_cmd(cmd, false);
 664                 return -1;
 665         }
 666
 667         spin_lock_bh(&conn->cmd_lock);
 668         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 669         spin_unlock_bh(&conn->cmd_lock);
 670
 671         cmd->i_state = ISTATE_SEND_REJECT;
 672         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 673
 674         return -1;
 675 }
 676
 677 static int iscsit_add_reject_from_cmd(
 678         struct iscsi_cmd *cmd,
 679         u8 reason,
 680         bool add_to_conn,
 681         unsigned char *buf)
 682 {
 683         struct iscsi_conn *conn;
 684
 685         if (!cmd->conn) {
 686                 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
 687                                 cmd->init_task_tag);
 688                 return -1;
 689         }
 690         conn = cmd->conn;
 691
 692         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 693         cmd->reject_reason = reason;
 694
 695         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 696         if (!cmd->buf_ptr) {
 697                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 698                 iscsit_free_cmd(cmd, false);
 699                 return -1;
 700         }
 701
 702         if (add_to_conn) {
 703                 spin_lock_bh(&conn->cmd_lock);
 704                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 705                 spin_unlock_bh(&conn->cmd_lock);
 706         }
 707
 708         cmd->i_state = ISTATE_SEND_REJECT;
 709         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 710         /*
 711          * Perform the kref_put now if se_cmd has already been setup by
 712          * scsit_setup_scsi_cmd()
 713          */
 714         if (cmd->se_cmd.se_tfo != NULL) {
 715                 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
 716                 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
 717         }
 718         return -1;
 719 }
 720
 721 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
 722                                  unsigned char *buf)
 723 {
 724         return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
 725 }
 726
 727 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
 728 {
 729         return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
 730 }
 731
 732 /*
 733  * Map some portion of the allocated scatterlist to an iovec, suitable for
 734  * kernel sockets to copy data in/out.
 735  */
 736 static int iscsit_map_iovec(
 737         struct iscsi_cmd *cmd,
 738         struct kvec *iov,
 739         u32 data_offset,
 740         u32 data_length)
 741 {
 742         u32 i = 0;
 743         struct scatterlist *sg;
 744         unsigned int page_off;
 745
 746         /*
 747          * We know each entry in t_data_sg contains a page.
 748          */
 749         sg = &cmd->se_cmd.t_data_sg[data_offset / PAGE_SIZE];
 750         page_off = (data_offset % PAGE_SIZE);
 751
 752         cmd->first_data_sg = sg;
 753         cmd->first_data_sg_off = page_off;
 754
 755         while (data_length) {
 756                 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
 757
 758                 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
 759                 iov[i].iov_len = cur_len;
 760
 761                 data_length -= cur_len;
 762                 page_off = 0;
 763                 sg = sg_next(sg);
 764                 i++;
 765         }
 766
 767         cmd->kmapped_nents = i;
 768
 769         return i;
 770 }
 771
 772 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
 773 {
 774         u32 i;
 775         struct scatterlist *sg;
 776
 777         sg = cmd->first_data_sg;
 778
 779         for (i = 0; i < cmd->kmapped_nents; i++)
 780                 kunmap(sg_page(&sg[i]));
 781 }
 782
 783 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
 784 {
 785         LIST_HEAD(ack_list);
 786         struct iscsi_cmd *cmd, *cmd_p;
 787
 788         conn->exp_statsn = exp_statsn;
 789
 790         if (conn->sess->sess_ops->RDMAExtensions)
 791                 return;
 792
 793         spin_lock_bh(&conn->cmd_lock);
 794         list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
 795                 spin_lock(&cmd->istate_lock);
 796                 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
 797                     iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
 798                         cmd->i_state = ISTATE_REMOVE;
 799                         spin_unlock(&cmd->istate_lock);
 800                         list_move_tail(&cmd->i_conn_node, &ack_list);
 801                         continue;
 802                 }
 803                 spin_unlock(&cmd->istate_lock);
 804         }
 805         spin_unlock_bh(&conn->cmd_lock);
 806
 807         list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
 808                 list_del_init(&cmd->i_conn_node);
 809                 iscsit_free_cmd(cmd, false);
 810         }
 811 }
 812
 813 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
 814 {
 815         u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
 816
 817         iov_count += ISCSI_IOV_DATA_BUFFER;
 818
 819         cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
 820         if (!cmd->iov_data) {
 821                 pr_err("Unable to allocate cmd->iov_data\n");
 822                 return -ENOMEM;
 823         }
 824
 825         cmd->orig_iov_data_count = iov_count;
 826         return 0;
 827 }
 828
 829 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 830                           unsigned char *buf)
 831 {
 832         int data_direction, payload_length;
 833         struct iscsi_scsi_req *hdr;
 834         int iscsi_task_attr;
 835         int sam_task_attr;
 836
 837         atomic_long_inc(&conn->sess->cmd_pdus);
 838
 839         hdr                     = (struct iscsi_scsi_req *) buf;
 840         payload_length          = ntoh24(hdr->dlength);
 841
 842         /* FIXME; Add checks for AdditionalHeaderSegment */
 843
 844         if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
 845             !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
 846                 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
 847                                 " not set. Bad iSCSI Initiator.\n");
 848                 return iscsit_add_reject_cmd(cmd,
 849                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 850         }
 851
 852         if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
 853              (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
 854                 /*
 855                  * From RFC-3720 Section 10.3.1:
 856                  *
 857                  * "Either or both of R and W MAY be 1 when either the
 858                  *  Expected Data Transfer Length and/or Bidirectional Read
 859                  *  Expected Data Transfer Length are 0"
 860                  *
 861                  * For this case, go ahead and clear the unnecssary bits
 862                  * to avoid any confusion with ->data_direction.
 863                  */
 864                 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
 865                 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
 866
 867                 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
 868                         " set when Expected Data Transfer Length is 0 for"
 869                         " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
 870         }
 871
 872         if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
 873             !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
 874                 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
 875                         " MUST be set if Expected Data Transfer Length is not 0."
 876                         " Bad iSCSI Initiator\n");
 877                 return iscsit_add_reject_cmd(cmd,
 878                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 879         }
 880
 881         if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
 882             (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
 883                 pr_err("Bidirectional operations not supported!\n");
 884                 return iscsit_add_reject_cmd(cmd,
 885                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 886         }
 887
 888         if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
 889                 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
 890                                 " Scsi Command PDU.\n");
 891                 return iscsit_add_reject_cmd(cmd,
 892                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 893         }
 894
 895         if (payload_length && !conn->sess->sess_ops->ImmediateData) {
 896                 pr_err("ImmediateData=No but DataSegmentLength=%u,"
 897                         " protocol error.\n", payload_length);
 898                 return iscsit_add_reject_cmd(cmd,
 899                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
 900         }
 901
 902         if ((be32_to_cpu(hdr->data_length) == payload_length) &&
 903             (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
 904                 pr_err("Expected Data Transfer Length and Length of"
 905                         " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
 906                         " bit is not set protocol error\n");
 907                 return iscsit_add_reject_cmd(cmd,
 908                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
 909         }
 910
 911         if (payload_length > be32_to_cpu(hdr->data_length)) {
 912                 pr_err("DataSegmentLength: %u is greater than"
 913                         " EDTL: %u, protocol error.\n", payload_length,
 914                                 hdr->data_length);
 915                 return iscsit_add_reject_cmd(cmd,
 916                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
 917         }
 918
 919         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
 920                 pr_err("DataSegmentLength: %u is greater than"
 921                         " MaxXmitDataSegmentLength: %u, protocol error.\n",
 922                         payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
 923                 return iscsit_add_reject_cmd(cmd,
 924                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
 925         }
 926
 927         if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
 928                 pr_err("DataSegmentLength: %u is greater than"
 929                         " FirstBurstLength: %u, protocol error.\n",
 930                         payload_length, conn->sess->sess_ops->FirstBurstLength);
 931                 return iscsit_add_reject_cmd(cmd,
 932                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
 933         }
 934
 935         data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
 936                          (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
 937                           DMA_NONE;
 938
 939         cmd->data_direction = data_direction;
 940         iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
 941         /*
 942          * Figure out the SAM Task Attribute for the incoming SCSI CDB
 943          */
 944         if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
 945             (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
 946                 sam_task_attr = MSG_SIMPLE_TAG;
 947         else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
 948                 sam_task_attr = MSG_ORDERED_TAG;
 949         else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
 950                 sam_task_attr = MSG_HEAD_TAG;
 951         else if (iscsi_task_attr == ISCSI_ATTR_ACA)
 952                 sam_task_attr = MSG_ACA_TAG;
 953         else {
 954                 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
 955                         " MSG_SIMPLE_TAG\n", iscsi_task_attr);
 956                 sam_task_attr = MSG_SIMPLE_TAG;
 957         }
 958
 959         cmd->iscsi_opcode       = ISCSI_OP_SCSI_CMD;
 960         cmd->i_state            = ISTATE_NEW_CMD;
 961         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
 962         cmd->immediate_data     = (payload_length) ? 1 : 0;
 963         cmd->unsolicited_data   = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
 964                                      (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
 965         if (cmd->unsolicited_data)
 966                 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
 967
 968         conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
 969         if (hdr->flags & ISCSI_FLAG_CMD_READ) {
 970                 spin_lock_bh(&conn->sess->ttt_lock);
 971                 cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
 972                 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
 973                         cmd->targ_xfer_tag = conn->sess->targ_xfer_tag++;
 974                 spin_unlock_bh(&conn->sess->ttt_lock);
 975         } else if (hdr->flags & ISCSI_FLAG_CMD_WRITE)
 976                 cmd->targ_xfer_tag = 0xFFFFFFFF;
 977         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
 978         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
 979         cmd->first_burst_len    = payload_length;
 980
 981         if (!conn->sess->sess_ops->RDMAExtensions &&
 982              cmd->data_direction == DMA_FROM_DEVICE) {
 983                 struct iscsi_datain_req *dr;
 984
 985                 dr = iscsit_allocate_datain_req();
 986                 if (!dr)
 987                         return iscsit_add_reject_cmd(cmd,
 988                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
 989
 990                 iscsit_attach_datain_req(cmd, dr);
 991         }
 992
 993         /*
 994          * Initialize struct se_cmd descriptor from target_core_mod infrastructure
 995          */
 996         transport_init_se_cmd(&cmd->se_cmd, &lio_target_fabric_configfs->tf_ops,
 997                         conn->sess->se_sess, be32_to_cpu(hdr->data_length),
 998                         cmd->data_direction, sam_task_attr,
 999                         cmd->sense_buffer + 2);
1000
1001         pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1002                 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
1003                 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1004                 conn->cid);
1005
1006         target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
1007
1008         cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
1009                                                      scsilun_to_int(&hdr->lun));
1010         if (cmd->sense_reason)
1011                 goto attach_cmd;
1012
1013         cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1014         if (cmd->sense_reason) {
1015                 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1016                         return iscsit_add_reject_cmd(cmd,
1017                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1018                 }
1019
1020                 goto attach_cmd;
1021         }
1022
1023         if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1024                 return iscsit_add_reject_cmd(cmd,
1025                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1026         }
1027
1028 attach_cmd:
1029         spin_lock_bh(&conn->cmd_lock);
1030         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1031         spin_unlock_bh(&conn->cmd_lock);
1032         /*
1033          * Check if we need to delay processing because of ALUA
1034          * Active/NonOptimized primary access state..
1035          */
1036         core_alua_check_nonop_delay(&cmd->se_cmd);
1037
1038         return 0;
1039 }
1040 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1041
1042 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1043 {
1044         iscsit_set_dataout_sequence_values(cmd);
1045
1046         spin_lock_bh(&cmd->dataout_timeout_lock);
1047         iscsit_start_dataout_timer(cmd, cmd->conn);
1048         spin_unlock_bh(&cmd->dataout_timeout_lock);
1049 }
1050 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1051
1052 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1053                             struct iscsi_scsi_req *hdr)
1054 {
1055         int cmdsn_ret = 0;
1056         /*
1057          * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1058          * the Immediate Bit is not set, and no Immediate
1059          * Data is attached.
1060          *
1061          * A PDU/CmdSN carrying Immediate Data can only
1062          * be processed after the DataCRC has passed.
1063          * If the DataCRC fails, the CmdSN MUST NOT
1064          * be acknowledged. (See below)
1065          */
1066         if (!cmd->immediate_data) {
1067                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1068                                         (unsigned char *)hdr, hdr->cmdsn);
1069                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1070                         return -1;
1071                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1072                         target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1073                         return 0;
1074                 }
1075         }
1076
1077         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1078
1079         /*
1080          * If no Immediate Data is attached, it's OK to return now.
1081          */
1082         if (!cmd->immediate_data) {
1083                 if (!cmd->sense_reason && cmd->unsolicited_data)
1084                         iscsit_set_unsoliticed_dataout(cmd);
1085                 if (!cmd->sense_reason)
1086                         return 0;
1087
1088                 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1089                 return 0;
1090         }
1091
1092         /*
1093          * Early CHECK_CONDITIONs with ImmediateData never make it to command
1094          * execution.  These exceptions are processed in CmdSN order using
1095          * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1096          */
1097         if (cmd->sense_reason) {
1098                 if (cmd->reject_reason)
1099                         return 0;
1100
1101                 return 1;
1102         }
1103         /*
1104          * Call directly into transport_generic_new_cmd() to perform
1105          * the backend memory allocation.
1106          */
1107         cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1108         if (cmd->sense_reason)
1109                 return 1;
1110
1111         return 0;
1112 }
1113 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1114
1115 static int
1116 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1117                           bool dump_payload)
1118 {
1119         struct iscsi_conn *conn = cmd->conn;
1120         int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1121         /*
1122          * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1123          */
1124         if (dump_payload)
1125                 goto after_immediate_data;
1126
1127         immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1128                                         cmd->first_burst_len);
1129 after_immediate_data:
1130         if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1131                 /*
1132                  * A PDU/CmdSN carrying Immediate Data passed
1133                  * DataCRC, check against ExpCmdSN/MaxCmdSN if
1134                  * Immediate Bit is not set.
1135                  */
1136                 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1137                                         (unsigned char *)hdr, hdr->cmdsn);
1138                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1139                         return -1;
1140
1141                 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1142                         int rc;
1143
1144                         rc = iscsit_dump_data_payload(cmd->conn,
1145                                                       cmd->first_burst_len, 1);
1146                         target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1147                         return rc;
1148                 } else if (cmd->unsolicited_data)
1149                         iscsit_set_unsoliticed_dataout(cmd);
1150
1151         } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1152                 /*
1153                  * Immediate Data failed DataCRC and ERL>=1,
1154                  * silently drop this PDU and let the initiator
1155                  * plug the CmdSN gap.
1156                  *
1157                  * FIXME: Send Unsolicited NOPIN with reserved
1158                  * TTT here to help the initiator figure out
1159                  * the missing CmdSN, although they should be
1160                  * intelligent enough to determine the missing
1161                  * CmdSN and issue a retry to plug the sequence.
1162                  */
1163                 cmd->i_state = ISTATE_REMOVE;
1164                 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1165         } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1166                 return -1;
1167
1168         return 0;
1169 }
1170
1171 static int
1172 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1173                            unsigned char *buf)
1174 {
1175         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1176         int rc, immed_data;
1177         bool dump_payload = false;
1178
1179         rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1180         if (rc < 0)
1181                 return 0;
1182         /*
1183          * Allocation iovecs needed for struct socket operations for
1184          * traditional iSCSI block I/O.
1185          */
1186         if (iscsit_allocate_iovecs(cmd) < 0) {
1187                 return iscsit_add_reject_cmd(cmd,
1188                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1189         }
1190         immed_data = cmd->immediate_data;
1191
1192         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1193         if (rc < 0)
1194                 return rc;
1195         else if (rc > 0)
1196                 dump_payload = true;
1197
1198         if (!immed_data)
1199                 return 0;
1200
1201         return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1202 }
1203
1204 static u32 iscsit_do_crypto_hash_sg(
1205         struct hash_desc *hash,
1206         struct iscsi_cmd *cmd,
1207         u32 data_offset,
1208         u32 data_length,
1209         u32 padding,
1210         u8 *pad_bytes)
1211 {
1212         u32 data_crc;
1213         u32 i;
1214         struct scatterlist *sg;
1215         unsigned int page_off;
1216
1217         crypto_hash_init(hash);
1218
1219         sg = cmd->first_data_sg;
1220         page_off = cmd->first_data_sg_off;
1221
1222         i = 0;
1223         while (data_length) {
1224                 u32 cur_len = min_t(u32, data_length, (sg[i].length - page_off));
1225
1226                 crypto_hash_update(hash, &sg[i], cur_len);
1227
1228                 data_length -= cur_len;
1229                 page_off = 0;
1230                 i++;
1231         }
1232
1233         if (padding) {
1234                 struct scatterlist pad_sg;
1235
1236                 sg_init_one(&pad_sg, pad_bytes, padding);
1237                 crypto_hash_update(hash, &pad_sg, padding);
1238         }
1239         crypto_hash_final(hash, (u8 *) &data_crc);
1240
1241         return data_crc;
1242 }
1243
1244 static void iscsit_do_crypto_hash_buf(
1245         struct hash_desc *hash,
1246         const void *buf,
1247         u32 payload_length,
1248         u32 padding,
1249         u8 *pad_bytes,
1250         u8 *data_crc)
1251 {
1252         struct scatterlist sg;
1253
1254         crypto_hash_init(hash);
1255
1256         sg_init_one(&sg, buf, payload_length);
1257         crypto_hash_update(hash, &sg, payload_length);
1258
1259         if (padding) {
1260                 sg_init_one(&sg, pad_bytes, padding);
1261                 crypto_hash_update(hash, &sg, padding);
1262         }
1263         crypto_hash_final(hash, data_crc);
1264 }
1265
1266 int
1267 iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf,
1268                           struct iscsi_cmd **out_cmd)
1269 {
1270         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1271         struct iscsi_cmd *cmd = NULL;
1272         struct se_cmd *se_cmd;
1273         u32 payload_length = ntoh24(hdr->dlength);
1274         int rc;
1275
1276         if (!payload_length) {
1277                 pr_warn("DataOUT payload is ZERO, ignoring.\n");
1278                 return 0;
1279         }
1280
1281         /* iSCSI write */
1282         atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1283
1284         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1285                 pr_err("DataSegmentLength: %u is greater than"
1286                         " MaxXmitDataSegmentLength: %u\n", payload_length,
1287                         conn->conn_ops->MaxXmitDataSegmentLength);
1288                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1289                                          buf);
1290         }
1291
1292         cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1293                         payload_length);
1294         if (!cmd)
1295                 return 0;
1296
1297         pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1298                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1299                 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1300                 payload_length, conn->cid);
1301
1302         if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1303                 pr_err("Command ITT: 0x%08x received DataOUT after"
1304                         " last DataOUT received, dumping payload\n",
1305                         cmd->init_task_tag);
1306                 return iscsit_dump_data_payload(conn, payload_length, 1);
1307         }
1308
1309         if (cmd->data_direction != DMA_TO_DEVICE) {
1310                 pr_err("Command ITT: 0x%08x received DataOUT for a"
1311                         " NON-WRITE command.\n", cmd->init_task_tag);
1312                 return iscsit_dump_data_payload(conn, payload_length, 1);
1313         }
1314         se_cmd = &cmd->se_cmd;
1315         iscsit_mod_dataout_timer(cmd);
1316
1317         if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1318                 pr_err("DataOut Offset: %u, Length %u greater than"
1319                         " iSCSI Command EDTL %u, protocol error.\n",
1320                         hdr->offset, payload_length, cmd->se_cmd.data_length);
1321                 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1322         }
1323
1324         if (cmd->unsolicited_data) {
1325                 int dump_unsolicited_data = 0;
1326
1327                 if (conn->sess->sess_ops->InitialR2T) {
1328                         pr_err("Received unexpected unsolicited data"
1329                                 " while InitialR2T=Yes, protocol error.\n");
1330                         transport_send_check_condition_and_sense(&cmd->se_cmd,
1331                                         TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1332                         return -1;
1333                 }
1334                 /*
1335                  * Special case for dealing with Unsolicited DataOUT
1336                  * and Unsupported SAM WRITE Opcodes and SE resource allocation
1337                  * failures;
1338                  */
1339
1340                 /* Something's amiss if we're not in WRITE_PENDING state... */
1341                 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1342                 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1343                         dump_unsolicited_data = 1;
1344
1345                 if (dump_unsolicited_data) {
1346                         /*
1347                          * Check if a delayed TASK_ABORTED status needs to
1348                          * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1349                          * received with the unsolicitied data out.
1350                          */
1351                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1352                                 iscsit_stop_dataout_timer(cmd);
1353
1354                         transport_check_aborted_status(se_cmd,
1355                                         (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1356                         return iscsit_dump_data_payload(conn, payload_length, 1);
1357                 }
1358         } else {
1359                 /*
1360                  * For the normal solicited data path:
1361                  *
1362                  * Check for a delayed TASK_ABORTED status and dump any
1363                  * incoming data out payload if one exists.  Also, when the
1364                  * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1365                  * data out sequence, we decrement outstanding_r2ts.  Once
1366                  * outstanding_r2ts reaches zero, go ahead and send the delayed
1367                  * TASK_ABORTED status.
1368                  */
1369                 if (se_cmd->transport_state & CMD_T_ABORTED) {
1370                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1371                                 if (--cmd->outstanding_r2ts < 1) {
1372                                         iscsit_stop_dataout_timer(cmd);
1373                                         transport_check_aborted_status(
1374                                                         se_cmd, 1);
1375                                 }
1376
1377                         return iscsit_dump_data_payload(conn, payload_length, 1);
1378                 }
1379         }
1380         /*
1381          * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1382          * within-command recovery checks before receiving the payload.
1383          */
1384         rc = iscsit_check_pre_dataout(cmd, buf);
1385         if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1386                 return 0;
1387         else if (rc == DATAOUT_CANNOT_RECOVER)
1388                 return -1;
1389
1390         *out_cmd = cmd;
1391         return 0;
1392 }
1393 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1394
1395 static int
1396 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1397                    struct iscsi_data *hdr)
1398 {
1399         struct kvec *iov;
1400         u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1401         u32 payload_length = ntoh24(hdr->dlength);
1402         int iov_ret, data_crc_failed = 0;
1403
1404         rx_size += payload_length;
1405         iov = &cmd->iov_data[0];
1406
1407         iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1408                                    payload_length);
1409         if (iov_ret < 0)
1410                 return -1;
1411
1412         iov_count += iov_ret;
1413
1414         padding = ((-payload_length) & 3);
1415         if (padding != 0) {
1416                 iov[iov_count].iov_base = cmd->pad_bytes;
1417                 iov[iov_count++].iov_len = padding;
1418                 rx_size += padding;
1419                 pr_debug("Receiving %u padding bytes.\n", padding);
1420         }
1421
1422         if (conn->conn_ops->DataDigest) {
1423                 iov[iov_count].iov_base = &checksum;
1424                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1425                 rx_size += ISCSI_CRC_LEN;
1426         }
1427
1428         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1429
1430         iscsit_unmap_iovec(cmd);
1431
1432         if (rx_got != rx_size)
1433                 return -1;
1434
1435         if (conn->conn_ops->DataDigest) {
1436                 u32 data_crc;
1437
1438                 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
1439                                                     be32_to_cpu(hdr->offset),
1440                                                     payload_length, padding,
1441                                                     cmd->pad_bytes);
1442
1443                 if (checksum != data_crc) {
1444                         pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1445                                 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1446                                 " does not match computed 0x%08x\n",
1447                                 hdr->itt, hdr->offset, payload_length,
1448                                 hdr->datasn, checksum, data_crc);
1449                         data_crc_failed = 1;
1450                 } else {
1451                         pr_debug("Got CRC32C DataDigest 0x%08x for"
1452                                 " %u bytes of Data Out\n", checksum,
1453                                 payload_length);
1454                 }
1455         }
1456
1457         return data_crc_failed;
1458 }
1459
1460 int
1461 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1462                              bool data_crc_failed)
1463 {
1464         struct iscsi_conn *conn = cmd->conn;
1465         int rc, ooo_cmdsn;
1466         /*
1467          * Increment post receive data and CRC values or perform
1468          * within-command recovery.
1469          */
1470         rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1471         if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1472                 return 0;
1473         else if (rc == DATAOUT_SEND_R2T) {
1474                 iscsit_set_dataout_sequence_values(cmd);
1475                 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1476         } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1477                 /*
1478                  * Handle extra special case for out of order
1479                  * Unsolicited Data Out.
1480                  */
1481                 spin_lock_bh(&cmd->istate_lock);
1482                 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1483                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1484                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1485                 spin_unlock_bh(&cmd->istate_lock);
1486
1487                 iscsit_stop_dataout_timer(cmd);
1488                 if (ooo_cmdsn)
1489                         return 0;
1490                 target_execute_cmd(&cmd->se_cmd);
1491                 return 0;
1492         } else /* DATAOUT_CANNOT_RECOVER */
1493                 return -1;
1494
1495         return 0;
1496 }
1497 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1498
1499 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1500 {
1501         struct iscsi_cmd *cmd = NULL;
1502         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1503         int rc;
1504         bool data_crc_failed = false;
1505
1506         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1507         if (rc < 0)
1508                 return 0;
1509         else if (!cmd)
1510                 return 0;
1511
1512         rc = iscsit_get_dataout(conn, cmd, hdr);
1513         if (rc < 0)
1514                 return rc;
1515         else if (rc > 0)
1516                 data_crc_failed = true;
1517
1518         return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1519 }
1520
1521 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1522                          struct iscsi_nopout *hdr)
1523 {
1524         u32 payload_length = ntoh24(hdr->dlength);
1525
1526         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1527                 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1528                 if (!cmd)
1529                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1530                                                  (unsigned char *)hdr);
1531
1532                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1533                                          (unsigned char *)hdr);
1534         }
1535
1536         if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1537                 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1538                         " not set, protocol error.\n");
1539                 if (!cmd)
1540                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1541                                                  (unsigned char *)hdr);
1542
1543                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1544                                          (unsigned char *)hdr);
1545         }
1546
1547         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1548                 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1549                         " greater than MaxXmitDataSegmentLength: %u, protocol"
1550                         " error.\n", payload_length,
1551                         conn->conn_ops->MaxXmitDataSegmentLength);
1552                 if (!cmd)
1553                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1554                                                  (unsigned char *)hdr);
1555
1556                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1557                                          (unsigned char *)hdr);
1558         }
1559
1560         pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1561                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1562                 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1563                 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1564                 payload_length);
1565         /*
1566          * This is not a response to a Unsolicited NopIN, which means
1567          * it can either be a NOPOUT ping request (with a valid ITT),
1568          * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1569          * Either way, make sure we allocate an struct iscsi_cmd, as both
1570          * can contain ping data.
1571          */
1572         if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1573                 cmd->iscsi_opcode       = ISCSI_OP_NOOP_OUT;
1574                 cmd->i_state            = ISTATE_SEND_NOPIN;
1575                 cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1576                                                 1 : 0);
1577                 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1578                 cmd->targ_xfer_tag      = 0xFFFFFFFF;
1579                 cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1580                 cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1581                 cmd->data_direction     = DMA_NONE;
1582         }
1583
1584         return 0;
1585 }
1586 EXPORT_SYMBOL(iscsit_setup_nop_out);
1587
1588 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1589                            struct iscsi_nopout *hdr)
1590 {
1591         struct iscsi_cmd *cmd_p = NULL;
1592         int cmdsn_ret = 0;
1593         /*
1594          * Initiator is expecting a NopIN ping reply..
1595          */
1596         if (hdr->itt != RESERVED_ITT) {
1597                 if (!cmd)
1598                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1599                                                 (unsigned char *)hdr);
1600
1601                 spin_lock_bh(&conn->cmd_lock);
1602                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1603                 spin_unlock_bh(&conn->cmd_lock);
1604
1605                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1606
1607                 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1608                         iscsit_add_cmd_to_response_queue(cmd, conn,
1609                                                          cmd->i_state);
1610                         return 0;
1611                 }
1612
1613                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1614                                 (unsigned char *)hdr, hdr->cmdsn);
1615                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1616                         return 0;
1617                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1618                         return -1;
1619
1620                 return 0;
1621         }
1622         /*
1623          * This was a response to a unsolicited NOPIN ping.
1624          */
1625         if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1626                 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1627                 if (!cmd_p)
1628                         return -EINVAL;
1629
1630                 iscsit_stop_nopin_response_timer(conn);
1631
1632                 cmd_p->i_state = ISTATE_REMOVE;
1633                 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1634
1635                 iscsit_start_nopin_timer(conn);
1636                 return 0;
1637         }
1638         /*
1639          * Otherwise, initiator is not expecting a NOPIN is response.
1640          * Just ignore for now.
1641          */
1642         return 0;
1643 }
1644 EXPORT_SYMBOL(iscsit_process_nop_out);
1645
1646 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1647                                  unsigned char *buf)
1648 {
1649         unsigned char *ping_data = NULL;
1650         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1651         struct kvec *iov = NULL;
1652         u32 payload_length = ntoh24(hdr->dlength);
1653         int ret;
1654
1655         ret = iscsit_setup_nop_out(conn, cmd, hdr);
1656         if (ret < 0)
1657                 return 0;
1658         /*
1659          * Handle NOP-OUT payload for traditional iSCSI sockets
1660          */
1661         if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1662                 u32 checksum, data_crc, padding = 0;
1663                 int niov = 0, rx_got, rx_size = payload_length;
1664
1665                 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1666                 if (!ping_data) {
1667                         pr_err("Unable to allocate memory for"
1668                                 " NOPOUT ping data.\n");
1669                         ret = -1;
1670                         goto out;
1671                 }
1672
1673                 iov = &cmd->iov_misc[0];
1674                 iov[niov].iov_base      = ping_data;
1675                 iov[niov++].iov_len     = payload_length;
1676
1677                 padding = ((-payload_length) & 3);
1678                 if (padding != 0) {
1679                         pr_debug("Receiving %u additional bytes"
1680                                 " for padding.\n", padding);
1681                         iov[niov].iov_base      = &cmd->pad_bytes;
1682                         iov[niov++].iov_len     = padding;
1683                         rx_size += padding;
1684                 }
1685                 if (conn->conn_ops->DataDigest) {
1686                         iov[niov].iov_base      = &checksum;
1687                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
1688                         rx_size += ISCSI_CRC_LEN;
1689                 }
1690
1691                 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1692                 if (rx_got != rx_size) {
1693                         ret = -1;
1694                         goto out;
1695                 }
1696
1697                 if (conn->conn_ops->DataDigest) {
1698                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
1699                                         ping_data, payload_length,
1700                                         padding, cmd->pad_bytes,
1701                                         (u8 *)&data_crc);
1702
1703                         if (checksum != data_crc) {
1704                                 pr_err("Ping data CRC32C DataDigest"
1705                                 " 0x%08x does not match computed 0x%08x\n",
1706                                         checksum, data_crc);
1707                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1708                                         pr_err("Unable to recover from"
1709                                         " NOPOUT Ping DataCRC failure while in"
1710                                                 " ERL=0.\n");
1711                                         ret = -1;
1712                                         goto out;
1713                                 } else {
1714                                         /*
1715                                          * Silently drop this PDU and let the
1716                                          * initiator plug the CmdSN gap.
1717                                          */
1718                                         pr_debug("Dropping NOPOUT"
1719                                         " Command CmdSN: 0x%08x due to"
1720                                         " DataCRC error.\n", hdr->cmdsn);
1721                                         ret = 0;
1722                                         goto out;
1723                                 }
1724                         } else {
1725                                 pr_debug("Got CRC32C DataDigest"
1726                                 " 0x%08x for %u bytes of ping data.\n",
1727                                         checksum, payload_length);
1728                         }
1729                 }
1730
1731                 ping_data[payload_length] = '\0';
1732                 /*
1733                  * Attach ping data to struct iscsi_cmd->buf_ptr.
1734                  */
1735                 cmd->buf_ptr = ping_data;
1736                 cmd->buf_ptr_size = payload_length;
1737
1738                 pr_debug("Got %u bytes of NOPOUT ping"
1739                         " data.\n", payload_length);
1740                 pr_debug("Ping Data: \"%s\"\n", ping_data);
1741         }
1742
1743         return iscsit_process_nop_out(conn, cmd, hdr);
1744 out:
1745         if (cmd)
1746                 iscsit_free_cmd(cmd, false);
1747
1748         kfree(ping_data);
1749         return ret;
1750 }
1751
1752 int
1753 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1754                            unsigned char *buf)
1755 {
1756         struct se_tmr_req *se_tmr;
1757         struct iscsi_tmr_req *tmr_req;
1758         struct iscsi_tm *hdr;
1759         int out_of_order_cmdsn = 0, ret;
1760         bool sess_ref = false;
1761         u8 function;
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         /*
1803          * TASK_REASSIGN for ERL=2 / connection stays inside of
1804          * LIO-Target $FABRIC_MOD
1805          */
1806         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1807
1808                 u8 tcm_function;
1809                 int ret;
1810
1811                 transport_init_se_cmd(&cmd->se_cmd,
1812                                       &lio_target_fabric_configfs->tf_ops,
1813                                       conn->sess->se_sess, 0, DMA_NONE,
1814                                       MSG_SIMPLE_TAG, cmd->sense_buffer + 2);
1815
1816                 target_get_sess_cmd(conn->sess->se_sess, &cmd->se_cmd, true);
1817                 sess_ref = true;
1818
1819                 switch (function) {
1820                 case ISCSI_TM_FUNC_ABORT_TASK:
1821                         tcm_function = TMR_ABORT_TASK;
1822                         break;
1823                 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1824                         tcm_function = TMR_ABORT_TASK_SET;
1825                         break;
1826                 case ISCSI_TM_FUNC_CLEAR_ACA:
1827                         tcm_function = TMR_CLEAR_ACA;
1828                         break;
1829                 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1830                         tcm_function = TMR_CLEAR_TASK_SET;
1831                         break;
1832                 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1833                         tcm_function = TMR_LUN_RESET;
1834                         break;
1835                 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1836                         tcm_function = TMR_TARGET_WARM_RESET;
1837                         break;
1838                 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1839                         tcm_function = TMR_TARGET_COLD_RESET;
1840                         break;
1841                 default:
1842                         pr_err("Unknown iSCSI TMR Function:"
1843                                " 0x%02x\n", function);
1844                         return iscsit_add_reject_cmd(cmd,
1845                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1846                 }
1847
1848                 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req,
1849                                          tcm_function, GFP_KERNEL);
1850                 if (ret < 0)
1851                         return iscsit_add_reject_cmd(cmd,
1852                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1853
1854                 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
1855         }
1856
1857         cmd->iscsi_opcode       = ISCSI_OP_SCSI_TMFUNC;
1858         cmd->i_state            = ISTATE_SEND_TASKMGTRSP;
1859         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1860         cmd->init_task_tag      = hdr->itt;
1861         cmd->targ_xfer_tag      = 0xFFFFFFFF;
1862         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1863         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1864         se_tmr                  = cmd->se_cmd.se_tmr_req;
1865         tmr_req                 = cmd->tmr_req;
1866         /*
1867          * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
1868          */
1869         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1870                 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
1871                                                scsilun_to_int(&hdr->lun));
1872                 if (ret < 0) {
1873                         se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
1874                         goto attach;
1875                 }
1876         }
1877
1878         switch (function) {
1879         case ISCSI_TM_FUNC_ABORT_TASK:
1880                 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
1881                 if (se_tmr->response)
1882                         goto attach;
1883                 break;
1884         case ISCSI_TM_FUNC_ABORT_TASK_SET:
1885         case ISCSI_TM_FUNC_CLEAR_ACA:
1886         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1887         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1888                 break;
1889         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1890                 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
1891                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1892                         goto attach;
1893                 }
1894                 break;
1895         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1896                 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
1897                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
1898                         goto attach;
1899                 }
1900                 break;
1901         case ISCSI_TM_FUNC_TASK_REASSIGN:
1902                 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
1903                 /*
1904                  * Perform sanity checks on the ExpDataSN only if the
1905                  * TASK_REASSIGN was successful.
1906                  */
1907                 if (se_tmr->response)
1908                         break;
1909
1910                 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
1911                         return iscsit_add_reject_cmd(cmd,
1912                                         ISCSI_REASON_BOOKMARK_INVALID, buf);
1913                 break;
1914         default:
1915                 pr_err("Unknown TMR function: 0x%02x, protocol"
1916                         " error.\n", function);
1917                 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
1918                 goto attach;
1919         }
1920
1921         if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1922             (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
1923                 se_tmr->call_transport = 1;
1924 attach:
1925         spin_lock_bh(&conn->cmd_lock);
1926         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1927         spin_unlock_bh(&conn->cmd_lock);
1928
1929         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1930                 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
1931                 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
1932                         out_of_order_cmdsn = 1;
1933                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1934                         return 0;
1935                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1936                         return -1;
1937         }
1938         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1939
1940         if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
1941                 return 0;
1942         /*
1943          * Found the referenced task, send to transport for processing.
1944          */
1945         if (se_tmr->call_transport)
1946                 return transport_generic_handle_tmr(&cmd->se_cmd);
1947
1948         /*
1949          * Could not find the referenced LUN, task, or Task Management
1950          * command not authorized or supported.  Change state and
1951          * let the tx_thread send the response.
1952          *
1953          * For connection recovery, this is also the default action for
1954          * TMR TASK_REASSIGN.
1955          */
1956         if (sess_ref) {
1957                 pr_debug("Handle TMR, using sess_ref=true check\n");
1958                 target_put_sess_cmd(conn->sess->se_sess, &cmd->se_cmd);
1959         }
1960
1961         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
1962         return 0;
1963 }
1964 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
1965
1966 /* #warning FIXME: Support Text Command parameters besides SendTargets */
1967 int
1968 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1969                       struct iscsi_text *hdr)
1970 {
1971         u32 payload_length = ntoh24(hdr->dlength);
1972
1973         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1974                 pr_err("Unable to accept text parameter length: %u"
1975                         "greater than MaxXmitDataSegmentLength %u.\n",
1976                        payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1977                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1978                                          (unsigned char *)hdr);
1979         }
1980
1981         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
1982              (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
1983                 pr_err("Multi sequence text commands currently not supported\n");
1984                 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
1985                                         (unsigned char *)hdr);
1986         }
1987
1988         pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
1989                 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
1990                 hdr->exp_statsn, payload_length);
1991
1992         cmd->iscsi_opcode       = ISCSI_OP_TEXT;
1993         cmd->i_state            = ISTATE_SEND_TEXTRSP;
1994         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1995         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
1996         cmd->targ_xfer_tag      = 0xFFFFFFFF;
1997         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1998         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1999         cmd->data_direction     = DMA_NONE;
2000
2001         return 0;
2002 }
2003 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2004
2005 int
2006 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2007                         struct iscsi_text *hdr)
2008 {
2009         unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2010         int cmdsn_ret;
2011
2012         if (!text_in) {
2013                 pr_err("Unable to locate text_in buffer for sendtargets"
2014                        " discovery\n");
2015                 goto reject;
2016         }
2017         if (strncmp("SendTargets", text_in, 11) != 0) {
2018                 pr_err("Received Text Data that is not"
2019                         " SendTargets, cannot continue.\n");
2020                 goto reject;
2021         }
2022         text_ptr = strchr(text_in, '=');
2023         if (!text_ptr) {
2024                 pr_err("No \"=\" separator found in Text Data,"
2025                         "  cannot continue.\n");
2026                 goto reject;
2027         }
2028         if (!strncmp("=All", text_ptr, 4)) {
2029                 cmd->cmd_flags |= IFC_SENDTARGETS_ALL;
2030         } else if (!strncmp("=iqn.", text_ptr, 5) ||
2031                    !strncmp("=eui.", text_ptr, 5)) {
2032                 cmd->cmd_flags |= IFC_SENDTARGETS_SINGLE;
2033         } else {
2034                 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2035                 goto reject;
2036         }
2037
2038         spin_lock_bh(&conn->cmd_lock);
2039         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2040         spin_unlock_bh(&conn->cmd_lock);
2041
2042         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2043
2044         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2045                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2046                                 (unsigned char *)hdr, hdr->cmdsn);
2047                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2048                         return -1;
2049
2050                 return 0;
2051         }
2052
2053         return iscsit_execute_cmd(cmd, 0);
2054
2055 reject:
2056         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2057                                  (unsigned char *)hdr);
2058 }
2059 EXPORT_SYMBOL(iscsit_process_text_cmd);
2060
2061 static int
2062 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2063                        unsigned char *buf)
2064 {
2065         struct iscsi_text *hdr = (struct iscsi_text *)buf;
2066         char *text_in = NULL;
2067         u32 payload_length = ntoh24(hdr->dlength);
2068         int rx_size, rc;
2069
2070         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2071         if (rc < 0)
2072                 return 0;
2073
2074         rx_size = payload_length;
2075         if (payload_length) {
2076                 u32 checksum = 0, data_crc = 0;
2077                 u32 padding = 0, pad_bytes = 0;
2078                 int niov = 0, rx_got;
2079                 struct kvec iov[3];
2080
2081                 text_in = kzalloc(payload_length, GFP_KERNEL);
2082                 if (!text_in) {
2083                         pr_err("Unable to allocate memory for"
2084                                 " incoming text parameters\n");
2085                         goto reject;
2086                 }
2087                 cmd->text_in_ptr = text_in;
2088
2089                 memset(iov, 0, 3 * sizeof(struct kvec));
2090                 iov[niov].iov_base      = text_in;
2091                 iov[niov++].iov_len     = payload_length;
2092
2093                 padding = ((-payload_length) & 3);
2094                 if (padding != 0) {
2095                         iov[niov].iov_base = &pad_bytes;
2096                         iov[niov++].iov_len  = padding;
2097                         rx_size += padding;
2098                         pr_debug("Receiving %u additional bytes"
2099                                         " for padding.\n", padding);
2100                 }
2101                 if (conn->conn_ops->DataDigest) {
2102                         iov[niov].iov_base      = &checksum;
2103                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
2104                         rx_size += ISCSI_CRC_LEN;
2105                 }
2106
2107                 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2108                 if (rx_got != rx_size)
2109                         goto reject;
2110
2111                 if (conn->conn_ops->DataDigest) {
2112                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
2113                                         text_in, payload_length,
2114                                         padding, (u8 *)&pad_bytes,
2115                                         (u8 *)&data_crc);
2116
2117                         if (checksum != data_crc) {
2118                                 pr_err("Text data CRC32C DataDigest"
2119                                         " 0x%08x does not match computed"
2120                                         " 0x%08x\n", checksum, data_crc);
2121                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2122                                         pr_err("Unable to recover from"
2123                                         " Text Data digest failure while in"
2124                                                 " ERL=0.\n");
2125                                         goto reject;
2126                                 } else {
2127                                         /*
2128                                          * Silently drop this PDU and let the
2129                                          * initiator plug the CmdSN gap.
2130                                          */
2131                                         pr_debug("Dropping Text"
2132                                         " Command CmdSN: 0x%08x due to"
2133                                         " DataCRC error.\n", hdr->cmdsn);
2134                                         kfree(text_in);
2135                                         return 0;
2136                                 }
2137                         } else {
2138                                 pr_debug("Got CRC32C DataDigest"
2139                                         " 0x%08x for %u bytes of text data.\n",
2140                                                 checksum, payload_length);
2141                         }
2142                 }
2143                 text_in[payload_length - 1] = '\0';
2144                 pr_debug("Successfully read %d bytes of text"
2145                                 " data.\n", payload_length);
2146         }
2147
2148         return iscsit_process_text_cmd(conn, cmd, hdr);
2149
2150 reject:
2151         kfree(cmd->text_in_ptr);
2152         cmd->text_in_ptr = NULL;
2153         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2154 }
2155 EXPORT_SYMBOL(iscsit_handle_text_cmd);
2156
2157 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2158 {
2159         struct iscsi_conn *conn_p;
2160         struct iscsi_session *sess = conn->sess;
2161
2162         pr_debug("Received logout request CLOSESESSION on CID: %hu"
2163                 " for SID: %u.\n", conn->cid, conn->sess->sid);
2164
2165         atomic_set(&sess->session_logout, 1);
2166         atomic_set(&conn->conn_logout_remove, 1);
2167         conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2168
2169         iscsit_inc_conn_usage_count(conn);
2170         iscsit_inc_session_usage_count(sess);
2171
2172         spin_lock_bh(&sess->conn_lock);
2173         list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2174                 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2175                         continue;
2176
2177                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2178                 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2179         }
2180         spin_unlock_bh(&sess->conn_lock);
2181
2182         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2183
2184         return 0;
2185 }
2186
2187 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2188 {
2189         struct iscsi_conn *l_conn;
2190         struct iscsi_session *sess = conn->sess;
2191
2192         pr_debug("Received logout request CLOSECONNECTION for CID:"
2193                 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2194
2195         /*
2196          * A Logout Request with a CLOSECONNECTION reason code for a CID
2197          * can arrive on a connection with a differing CID.
2198          */
2199         if (conn->cid == cmd->logout_cid) {
2200                 spin_lock_bh(&conn->state_lock);
2201                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2202                 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2203
2204                 atomic_set(&conn->conn_logout_remove, 1);
2205                 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2206                 iscsit_inc_conn_usage_count(conn);
2207
2208                 spin_unlock_bh(&conn->state_lock);
2209         } else {
2210                 /*
2211                  * Handle all different cid CLOSECONNECTION requests in
2212                  * iscsit_logout_post_handler_diffcid() as to give enough
2213                  * time for any non immediate command's CmdSN to be
2214                  * acknowledged on the connection in question.
2215                  *
2216                  * Here we simply make sure the CID is still around.
2217                  */
2218                 l_conn = iscsit_get_conn_from_cid(sess,
2219                                 cmd->logout_cid);
2220                 if (!l_conn) {
2221                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2222                         iscsit_add_cmd_to_response_queue(cmd, conn,
2223                                         cmd->i_state);
2224                         return 0;
2225                 }
2226
2227                 iscsit_dec_conn_usage_count(l_conn);
2228         }
2229
2230         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2231
2232         return 0;
2233 }
2234
2235 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2236 {
2237         struct iscsi_session *sess = conn->sess;
2238
2239         pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2240                 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2241
2242         if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2243                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2244                         " while ERL!=2.\n");
2245                 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2246                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2247                 return 0;
2248         }
2249
2250         if (conn->cid == cmd->logout_cid) {
2251                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2252                         " with CID: %hu on CID: %hu, implementation error.\n",
2253                                 cmd->logout_cid, conn->cid);
2254                 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2255                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2256                 return 0;
2257         }
2258
2259         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2260
2261         return 0;
2262 }
2263
2264 int
2265 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2266                         unsigned char *buf)
2267 {
2268         int cmdsn_ret, logout_remove = 0;
2269         u8 reason_code = 0;
2270         struct iscsi_logout *hdr;
2271         struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2272
2273         hdr                     = (struct iscsi_logout *) buf;
2274         reason_code             = (hdr->flags & 0x7f);
2275
2276         if (tiqn) {
2277                 spin_lock(&tiqn->logout_stats.lock);
2278                 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2279                         tiqn->logout_stats.normal_logouts++;
2280                 else
2281                         tiqn->logout_stats.abnormal_logouts++;
2282                 spin_unlock(&tiqn->logout_stats.lock);
2283         }
2284
2285         pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2286                 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2287                 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2288                 hdr->cid, conn->cid);
2289
2290         if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2291                 pr_err("Received logout request on connection that"
2292                         " is not in logged in state, ignoring request.\n");
2293                 iscsit_free_cmd(cmd, false);
2294                 return 0;
2295         }
2296
2297         cmd->iscsi_opcode       = ISCSI_OP_LOGOUT;
2298         cmd->i_state            = ISTATE_SEND_LOGOUTRSP;
2299         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2300         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2301         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2302         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2303         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2304         cmd->logout_cid         = be16_to_cpu(hdr->cid);
2305         cmd->logout_reason      = reason_code;
2306         cmd->data_direction     = DMA_NONE;
2307
2308         /*
2309          * We need to sleep in these cases (by returning 1) until the Logout
2310          * Response gets sent in the tx thread.
2311          */
2312         if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2313            ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2314             be16_to_cpu(hdr->cid) == conn->cid))
2315                 logout_remove = 1;
2316
2317         spin_lock_bh(&conn->cmd_lock);
2318         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2319         spin_unlock_bh(&conn->cmd_lock);
2320
2321         if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2322                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2323
2324         /*
2325          * Immediate commands are executed, well, immediately.
2326          * Non-Immediate Logout Commands are executed in CmdSN order.
2327          */
2328         if (cmd->immediate_cmd) {
2329                 int ret = iscsit_execute_cmd(cmd, 0);
2330
2331                 if (ret < 0)
2332                         return ret;
2333         } else {
2334                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2335                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2336                         logout_remove = 0;
2337                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2338                         return -1;
2339         }
2340
2341         return logout_remove;
2342 }
2343 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2344
2345 static int iscsit_handle_snack(
2346         struct iscsi_conn *conn,
2347         unsigned char *buf)
2348 {
2349         struct iscsi_snack *hdr;
2350
2351         hdr                     = (struct iscsi_snack *) buf;
2352         hdr->flags              &= ~ISCSI_FLAG_CMD_FINAL;
2353
2354         pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2355                 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2356                 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2357                         hdr->begrun, hdr->runlength, conn->cid);
2358
2359         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2360                 pr_err("Initiator sent SNACK request while in"
2361                         " ErrorRecoveryLevel=0.\n");
2362                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2363                                          buf);
2364         }
2365         /*
2366          * SNACK_DATA and SNACK_R2T are both 0,  so check which function to
2367          * call from inside iscsi_send_recovery_datain_or_r2t().
2368          */
2369         switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2370         case 0:
2371                 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2372                         hdr->itt,
2373                         be32_to_cpu(hdr->ttt),
2374                         be32_to_cpu(hdr->begrun),
2375                         be32_to_cpu(hdr->runlength));
2376         case ISCSI_FLAG_SNACK_TYPE_STATUS:
2377                 return iscsit_handle_status_snack(conn, hdr->itt,
2378                         be32_to_cpu(hdr->ttt),
2379                         be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2380         case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2381                 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2382                         be32_to_cpu(hdr->begrun),
2383                         be32_to_cpu(hdr->runlength));
2384         case ISCSI_FLAG_SNACK_TYPE_RDATA:
2385                 /* FIXME: Support R-Data SNACK */
2386                 pr_err("R-Data SNACK Not Supported.\n");
2387                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2388                                          buf);
2389         default:
2390                 pr_err("Unknown SNACK type 0x%02x, protocol"
2391                         " error.\n", hdr->flags & 0x0f);
2392                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2393                                          buf);
2394         }
2395
2396         return 0;
2397 }
2398
2399 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2400 {
2401         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2402             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2403                 wait_for_completion_interruptible_timeout(
2404                                         &conn->rx_half_close_comp,
2405                                         ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2406         }
2407 }
2408
2409 static int iscsit_handle_immediate_data(
2410         struct iscsi_cmd *cmd,
2411         struct iscsi_scsi_req *hdr,
2412         u32 length)
2413 {
2414         int iov_ret, rx_got = 0, rx_size = 0;
2415         u32 checksum, iov_count = 0, padding = 0;
2416         struct iscsi_conn *conn = cmd->conn;
2417         struct kvec *iov;
2418
2419         iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2420         if (iov_ret < 0)
2421                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2422
2423         rx_size = length;
2424         iov_count = iov_ret;
2425         iov = &cmd->iov_data[0];
2426
2427         padding = ((-length) & 3);
2428         if (padding != 0) {
2429                 iov[iov_count].iov_base = cmd->pad_bytes;
2430                 iov[iov_count++].iov_len = padding;
2431                 rx_size += padding;
2432         }
2433
2434         if (conn->conn_ops->DataDigest) {
2435                 iov[iov_count].iov_base         = &checksum;
2436                 iov[iov_count++].iov_len        = ISCSI_CRC_LEN;
2437                 rx_size += ISCSI_CRC_LEN;
2438         }
2439
2440         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2441
2442         iscsit_unmap_iovec(cmd);
2443
2444         if (rx_got != rx_size) {
2445                 iscsit_rx_thread_wait_for_tcp(conn);
2446                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2447         }
2448
2449         if (conn->conn_ops->DataDigest) {
2450                 u32 data_crc;
2451
2452                 data_crc = iscsit_do_crypto_hash_sg(&conn->conn_rx_hash, cmd,
2453                                                     cmd->write_data_done, length, padding,
2454                                                     cmd->pad_bytes);
2455
2456                 if (checksum != data_crc) {
2457                         pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2458                                 " does not match computed 0x%08x\n", checksum,
2459                                 data_crc);
2460
2461                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2462                                 pr_err("Unable to recover from"
2463                                         " Immediate Data digest failure while"
2464                                         " in ERL=0.\n");
2465                                 iscsit_reject_cmd(cmd,
2466                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2467                                                 (unsigned char *)hdr);
2468                                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2469                         } else {
2470                                 iscsit_reject_cmd(cmd,
2471                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2472                                                 (unsigned char *)hdr);
2473                                 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2474                         }
2475                 } else {
2476                         pr_debug("Got CRC32C DataDigest 0x%08x for"
2477                                 " %u bytes of Immediate Data\n", checksum,
2478                                 length);
2479                 }
2480         }
2481
2482         cmd->write_data_done += length;
2483
2484         if (cmd->write_data_done == cmd->se_cmd.data_length) {
2485                 spin_lock_bh(&cmd->istate_lock);
2486                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2487                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2488                 spin_unlock_bh(&cmd->istate_lock);
2489         }
2490
2491         return IMMEDIATE_DATA_NORMAL_OPERATION;
2492 }
2493
2494 /*
2495  *      Called with sess->conn_lock held.
2496  */
2497 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2498         with active network interface */
2499 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2500 {
2501         struct iscsi_cmd *cmd;
2502         struct iscsi_conn *conn_p;
2503         bool found = false;
2504
2505         /*
2506          * Only send a Asynchronous Message on connections whos network
2507          * interface is still functional.
2508          */
2509         list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2510                 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2511                         iscsit_inc_conn_usage_count(conn_p);
2512                         found = true;
2513                         break;
2514                 }
2515         }
2516
2517         if (!found)
2518                 return;
2519
2520         cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2521         if (!cmd) {
2522                 iscsit_dec_conn_usage_count(conn_p);
2523                 return;
2524         }
2525
2526         cmd->logout_cid = conn->cid;
2527         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2528         cmd->i_state = ISTATE_SEND_ASYNCMSG;
2529
2530         spin_lock_bh(&conn_p->cmd_lock);
2531         list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2532         spin_unlock_bh(&conn_p->cmd_lock);
2533
2534         iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2535         iscsit_dec_conn_usage_count(conn_p);
2536 }
2537
2538 static int iscsit_send_conn_drop_async_message(
2539         struct iscsi_cmd *cmd,
2540         struct iscsi_conn *conn)
2541 {
2542         struct iscsi_async *hdr;
2543
2544         cmd->tx_size = ISCSI_HDR_LEN;
2545         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2546
2547         hdr                     = (struct iscsi_async *) cmd->pdu;
2548         hdr->opcode             = ISCSI_OP_ASYNC_EVENT;
2549         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
2550         cmd->init_task_tag      = RESERVED_ITT;
2551         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2552         put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2553         cmd->stat_sn            = conn->stat_sn++;
2554         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2555         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2556         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2557         hdr->async_event        = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2558         hdr->param1             = cpu_to_be16(cmd->logout_cid);
2559         hdr->param2             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2560         hdr->param3             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2561
2562         if (conn->conn_ops->HeaderDigest) {
2563                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2564
2565                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2566                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2567
2568                 cmd->tx_size += ISCSI_CRC_LEN;
2569                 pr_debug("Attaching CRC32C HeaderDigest to"
2570                         " Async Message 0x%08x\n", *header_digest);
2571         }
2572
2573         cmd->iov_misc[0].iov_base       = cmd->pdu;
2574         cmd->iov_misc[0].iov_len        = cmd->tx_size;
2575         cmd->iov_misc_count             = 1;
2576
2577         pr_debug("Sending Connection Dropped Async Message StatSN:"
2578                 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2579                         cmd->logout_cid, conn->cid);
2580         return 0;
2581 }
2582
2583 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2584 {
2585         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2586             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2587                 wait_for_completion_interruptible_timeout(
2588                                         &conn->tx_half_close_comp,
2589                                         ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2590         }
2591 }
2592
2593 static void
2594 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2595                         struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2596                         bool set_statsn)
2597 {
2598         hdr->opcode             = ISCSI_OP_SCSI_DATA_IN;
2599         hdr->flags              = datain->flags;
2600         if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2601                 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2602                         hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2603                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2604                 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2605                         hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2606                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2607                 }
2608         }
2609         hton24(hdr->dlength, datain->length);
2610         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2611                 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2612                                 (struct scsi_lun *)&hdr->lun);
2613         else
2614                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2615
2616         hdr->itt                = cmd->init_task_tag;
2617
2618         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2619                 hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2620         else
2621                 hdr->ttt                = cpu_to_be32(0xFFFFFFFF);
2622         if (set_statsn)
2623                 hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2624         else
2625                 hdr->statsn             = cpu_to_be32(0xFFFFFFFF);
2626
2627         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2628         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2629         hdr->datasn             = cpu_to_be32(datain->data_sn);
2630         hdr->offset             = cpu_to_be32(datain->offset);
2631
2632         pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2633                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2634                 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2635                 ntohl(hdr->offset), datain->length, conn->cid);
2636 }
2637
2638 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2639 {
2640         struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2641         struct iscsi_datain datain;
2642         struct iscsi_datain_req *dr;
2643         struct kvec *iov;
2644         u32 iov_count = 0, tx_size = 0;
2645         int eodr = 0, ret, iov_ret;
2646         bool set_statsn = false;
2647
2648         memset(&datain, 0, sizeof(struct iscsi_datain));
2649         dr = iscsit_get_datain_values(cmd, &datain);
2650         if (!dr) {
2651                 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2652                                 cmd->init_task_tag);
2653                 return -1;
2654         }
2655         /*
2656          * Be paranoid and double check the logic for now.
2657          */
2658         if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2659                 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2660                         " datain.length: %u exceeds cmd->data_length: %u\n",
2661                         cmd->init_task_tag, datain.offset, datain.length,
2662                         cmd->se_cmd.data_length);
2663                 return -1;
2664         }
2665
2666         atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2667         /*
2668          * Special case for successfully execution w/ both DATAIN
2669          * and Sense Data.
2670          */
2671         if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2672             (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2673                 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2674         else {
2675                 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2676                     (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2677                         iscsit_increment_maxcmdsn(cmd, conn->sess);
2678                         cmd->stat_sn = conn->stat_sn++;
2679                         set_statsn = true;
2680                 } else if (dr->dr_complete ==
2681                            DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2682                         set_statsn = true;
2683         }
2684
2685         iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2686
2687         iov = &cmd->iov_data[0];
2688         iov[iov_count].iov_base = cmd->pdu;
2689         iov[iov_count++].iov_len        = ISCSI_HDR_LEN;
2690         tx_size += ISCSI_HDR_LEN;
2691
2692         if (conn->conn_ops->HeaderDigest) {
2693                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2694
2695                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
2696                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2697
2698                 iov[0].iov_len += ISCSI_CRC_LEN;
2699                 tx_size += ISCSI_CRC_LEN;
2700
2701                 pr_debug("Attaching CRC32 HeaderDigest"
2702                         " for DataIN PDU 0x%08x\n", *header_digest);
2703         }
2704
2705         iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
2706                                 datain.offset, datain.length);
2707         if (iov_ret < 0)
2708                 return -1;
2709
2710         iov_count += iov_ret;
2711         tx_size += datain.length;
2712
2713         cmd->padding = ((-datain.length) & 3);
2714         if (cmd->padding) {
2715                 iov[iov_count].iov_base         = cmd->pad_bytes;
2716                 iov[iov_count++].iov_len        = cmd->padding;
2717                 tx_size += cmd->padding;
2718
2719                 pr_debug("Attaching %u padding bytes\n",
2720                                 cmd->padding);
2721         }
2722         if (conn->conn_ops->DataDigest) {
2723                 cmd->data_crc = iscsit_do_crypto_hash_sg(&conn->conn_tx_hash, cmd,
2724                          datain.offset, datain.length, cmd->padding, cmd->pad_bytes);
2725
2726                 iov[iov_count].iov_base = &cmd->data_crc;
2727                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
2728                 tx_size += ISCSI_CRC_LEN;
2729
2730                 pr_debug("Attached CRC32C DataDigest %d bytes, crc"
2731                         " 0x%08x\n", datain.length+cmd->padding, cmd->data_crc);
2732         }
2733
2734         cmd->iov_data_count = iov_count;
2735         cmd->tx_size = tx_size;
2736
2737         /* sendpage is preferred but can't insert markers */
2738         if (!conn->conn_ops->IFMarker)
2739                 ret = iscsit_fe_sendpage_sg(cmd, conn);
2740         else
2741                 ret = iscsit_send_tx_data(cmd, conn, 0);
2742
2743         iscsit_unmap_iovec(cmd);
2744
2745         if (ret < 0) {
2746                 iscsit_tx_thread_wait_for_tcp(conn);
2747                 return ret;
2748         }
2749
2750         if (dr->dr_complete) {
2751                 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2752                                 2 : 1;
2753                 iscsit_free_datain_req(cmd, dr);
2754         }
2755
2756         return eodr;
2757 }
2758
2759 int
2760 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2761                         struct iscsi_logout_rsp *hdr)
2762 {
2763         struct iscsi_conn *logout_conn = NULL;
2764         struct iscsi_conn_recovery *cr = NULL;
2765         struct iscsi_session *sess = conn->sess;
2766         /*
2767          * The actual shutting down of Sessions and/or Connections
2768          * for CLOSESESSION and CLOSECONNECTION Logout Requests
2769          * is done in scsi_logout_post_handler().
2770          */
2771         switch (cmd->logout_reason) {
2772         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2773                 pr_debug("iSCSI session logout successful, setting"
2774                         " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2775                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2776                 break;
2777         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2778                 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2779                         break;
2780                 /*
2781                  * For CLOSECONNECTION logout requests carrying
2782                  * a matching logout CID -> local CID, the reference
2783                  * for the local CID will have been incremented in
2784                  * iscsi_logout_closeconnection().
2785                  *
2786                  * For CLOSECONNECTION logout requests carrying
2787                  * a different CID than the connection it arrived
2788                  * on, the connection responding to cmd->logout_cid
2789                  * is stopped in iscsit_logout_post_handler_diffcid().
2790                  */
2791
2792                 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2793                         " successful.\n", cmd->logout_cid, conn->cid);
2794                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2795                 break;
2796         case ISCSI_LOGOUT_REASON_RECOVERY:
2797                 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2798                     (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2799                         break;
2800                 /*
2801                  * If the connection is still active from our point of view
2802                  * force connection recovery to occur.
2803                  */
2804                 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2805                                 cmd->logout_cid);
2806                 if (logout_conn) {
2807                         iscsit_connection_reinstatement_rcfr(logout_conn);
2808                         iscsit_dec_conn_usage_count(logout_conn);
2809                 }
2810
2811                 cr = iscsit_get_inactive_connection_recovery_entry(
2812                                 conn->sess, cmd->logout_cid);
2813                 if (!cr) {
2814                         pr_err("Unable to locate CID: %hu for"
2815                         " REMOVECONNFORRECOVERY Logout Request.\n",
2816                                 cmd->logout_cid);
2817                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2818                         break;
2819                 }
2820
2821                 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2822
2823                 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2824                         " for recovery for CID: %hu on CID: %hu successful.\n",
2825                                 cmd->logout_cid, conn->cid);
2826                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2827                 break;
2828         default:
2829                 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2830                                 cmd->logout_reason);
2831                 return -1;
2832         }
2833
2834         hdr->opcode             = ISCSI_OP_LOGOUT_RSP;
2835         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2836         hdr->response           = cmd->logout_response;
2837         hdr->itt                = cmd->init_task_tag;
2838         cmd->stat_sn            = conn->stat_sn++;
2839         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2840
2841         iscsit_increment_maxcmdsn(cmd, conn->sess);
2842         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2843         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2844
2845         pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2846                 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2847                 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2848                 cmd->logout_cid, conn->cid);
2849
2850         return 0;
2851 }
2852 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2853
2854 static int
2855 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2856 {
2857         struct kvec *iov;
2858         int niov = 0, tx_size, rc;
2859
2860         rc = iscsit_build_logout_rsp(cmd, conn,
2861                         (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2862         if (rc < 0)
2863                 return rc;
2864
2865         tx_size = ISCSI_HDR_LEN;
2866         iov = &cmd->iov_misc[0];
2867         iov[niov].iov_base      = cmd->pdu;
2868         iov[niov++].iov_len     = ISCSI_HDR_LEN;
2869
2870         if (conn->conn_ops->HeaderDigest) {
2871                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2872
2873                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, &cmd->pdu[0],
2874                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2875
2876                 iov[0].iov_len += ISCSI_CRC_LEN;
2877                 tx_size += ISCSI_CRC_LEN;
2878                 pr_debug("Attaching CRC32C HeaderDigest to"
2879                         " Logout Response 0x%08x\n", *header_digest);
2880         }
2881         cmd->iov_misc_count = niov;
2882         cmd->tx_size = tx_size;
2883
2884         return 0;
2885 }
2886
2887 void
2888 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2889                        struct iscsi_nopin *hdr, bool nopout_response)
2890 {
2891         hdr->opcode             = ISCSI_OP_NOOP_IN;
2892         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2893         hton24(hdr->dlength, cmd->buf_ptr_size);
2894         if (nopout_response)
2895                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2896         hdr->itt                = cmd->init_task_tag;
2897         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2898         cmd->stat_sn            = (nopout_response) ? conn->stat_sn++ :
2899                                   conn->stat_sn;
2900         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2901
2902         if (nopout_response)
2903                 iscsit_increment_maxcmdsn(cmd, conn->sess);
2904
2905         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2906         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
2907
2908         pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2909                 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2910                 "Solicitied" : "Unsolicitied", cmd->init_task_tag,
2911                 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2912 }
2913 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2914
2915 /*
2916  *      Unsolicited NOPIN, either requesting a response or not.
2917  */
2918 static int iscsit_send_unsolicited_nopin(
2919         struct iscsi_cmd *cmd,
2920         struct iscsi_conn *conn,
2921         int want_response)
2922 {
2923         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2924         int tx_size = ISCSI_HDR_LEN, ret;
2925
2926         iscsit_build_nopin_rsp(cmd, conn, hdr, false);
2927
2928         if (conn->conn_ops->HeaderDigest) {
2929                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2930
2931                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2932                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2933
2934                 tx_size += ISCSI_CRC_LEN;
2935                 pr_debug("Attaching CRC32C HeaderDigest to"
2936                         " NopIN 0x%08x\n", *header_digest);
2937         }
2938
2939         cmd->iov_misc[0].iov_base       = cmd->pdu;
2940         cmd->iov_misc[0].iov_len        = tx_size;
2941         cmd->iov_misc_count     = 1;
2942         cmd->tx_size            = tx_size;
2943
2944         pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
2945                 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
2946
2947         ret = iscsit_send_tx_data(cmd, conn, 1);
2948         if (ret < 0) {
2949                 iscsit_tx_thread_wait_for_tcp(conn);
2950                 return ret;
2951         }
2952
2953         spin_lock_bh(&cmd->istate_lock);
2954         cmd->i_state = want_response ?
2955                 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
2956         spin_unlock_bh(&cmd->istate_lock);
2957
2958         return 0;
2959 }
2960
2961 static int
2962 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2963 {
2964         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2965         struct kvec *iov;
2966         u32 padding = 0;
2967         int niov = 0, tx_size;
2968
2969         iscsit_build_nopin_rsp(cmd, conn, hdr, true);
2970
2971         tx_size = ISCSI_HDR_LEN;
2972         iov = &cmd->iov_misc[0];
2973         iov[niov].iov_base      = cmd->pdu;
2974         iov[niov++].iov_len     = ISCSI_HDR_LEN;
2975
2976         if (conn->conn_ops->HeaderDigest) {
2977                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
2978
2979                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
2980                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
2981
2982                 iov[0].iov_len += ISCSI_CRC_LEN;
2983                 tx_size += ISCSI_CRC_LEN;
2984                 pr_debug("Attaching CRC32C HeaderDigest"
2985                         " to NopIn 0x%08x\n", *header_digest);
2986         }
2987
2988         /*
2989          * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
2990          * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
2991          */
2992         if (cmd->buf_ptr_size) {
2993                 iov[niov].iov_base      = cmd->buf_ptr;
2994                 iov[niov++].iov_len     = cmd->buf_ptr_size;
2995                 tx_size += cmd->buf_ptr_size;
2996
2997                 pr_debug("Echoing back %u bytes of ping"
2998                         " data.\n", cmd->buf_ptr_size);
2999
3000                 padding = ((-cmd->buf_ptr_size) & 3);
3001                 if (padding != 0) {
3002                         iov[niov].iov_base = &cmd->pad_bytes;
3003                         iov[niov++].iov_len = padding;
3004                         tx_size += padding;
3005                         pr_debug("Attaching %u additional"
3006                                 " padding bytes.\n", padding);
3007                 }
3008                 if (conn->conn_ops->DataDigest) {
3009                         iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3010                                 cmd->buf_ptr, cmd->buf_ptr_size,
3011                                 padding, (u8 *)&cmd->pad_bytes,
3012                                 (u8 *)&cmd->data_crc);
3013
3014                         iov[niov].iov_base = &cmd->data_crc;
3015                         iov[niov++].iov_len = ISCSI_CRC_LEN;
3016                         tx_size += ISCSI_CRC_LEN;
3017                         pr_debug("Attached DataDigest for %u"
3018                                 " bytes of ping data, CRC 0x%08x\n",
3019                                 cmd->buf_ptr_size, cmd->data_crc);
3020                 }
3021         }
3022
3023         cmd->iov_misc_count = niov;
3024         cmd->tx_size = tx_size;
3025
3026         return 0;
3027 }
3028
3029 static int iscsit_send_r2t(
3030         struct iscsi_cmd *cmd,
3031         struct iscsi_conn *conn)
3032 {
3033         int tx_size = 0;
3034         struct iscsi_r2t *r2t;
3035         struct iscsi_r2t_rsp *hdr;
3036         int ret;
3037
3038         r2t = iscsit_get_r2t_from_list(cmd);
3039         if (!r2t)
3040                 return -1;
3041
3042         hdr                     = (struct iscsi_r2t_rsp *) cmd->pdu;
3043         memset(hdr, 0, ISCSI_HDR_LEN);
3044         hdr->opcode             = ISCSI_OP_R2T;
3045         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3046         int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3047                         (struct scsi_lun *)&hdr->lun);
3048         hdr->itt                = cmd->init_task_tag;
3049         spin_lock_bh(&conn->sess->ttt_lock);
3050         r2t->targ_xfer_tag      = conn->sess->targ_xfer_tag++;
3051         if (r2t->targ_xfer_tag == 0xFFFFFFFF)
3052                 r2t->targ_xfer_tag = conn->sess->targ_xfer_tag++;
3053         spin_unlock_bh(&conn->sess->ttt_lock);
3054         hdr->ttt                = cpu_to_be32(r2t->targ_xfer_tag);
3055         hdr->statsn             = cpu_to_be32(conn->stat_sn);
3056         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3057         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3058         hdr->r2tsn              = cpu_to_be32(r2t->r2t_sn);
3059         hdr->data_offset        = cpu_to_be32(r2t->offset);
3060         hdr->data_length        = cpu_to_be32(r2t->xfer_len);
3061
3062         cmd->iov_misc[0].iov_base       = cmd->pdu;
3063         cmd->iov_misc[0].iov_len        = ISCSI_HDR_LEN;
3064         tx_size += ISCSI_HDR_LEN;
3065
3066         if (conn->conn_ops->HeaderDigest) {
3067                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3068
3069                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3070                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3071
3072                 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3073                 tx_size += ISCSI_CRC_LEN;
3074                 pr_debug("Attaching CRC32 HeaderDigest for R2T"
3075                         " PDU 0x%08x\n", *header_digest);
3076         }
3077
3078         pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3079                 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3080                 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3081                 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3082                         r2t->offset, r2t->xfer_len, conn->cid);
3083
3084         cmd->iov_misc_count = 1;
3085         cmd->tx_size = tx_size;
3086
3087         spin_lock_bh(&cmd->r2t_lock);
3088         r2t->sent_r2t = 1;
3089         spin_unlock_bh(&cmd->r2t_lock);
3090
3091         ret = iscsit_send_tx_data(cmd, conn, 1);
3092         if (ret < 0) {
3093                 iscsit_tx_thread_wait_for_tcp(conn);
3094                 return ret;
3095         }
3096
3097         spin_lock_bh(&cmd->dataout_timeout_lock);
3098         iscsit_start_dataout_timer(cmd, conn);
3099         spin_unlock_bh(&cmd->dataout_timeout_lock);
3100
3101         return 0;
3102 }
3103
3104 /*
3105  *      @recovery: If called from iscsi_task_reassign_complete_write() for
3106  *              connection recovery.
3107  */
3108 int iscsit_build_r2ts_for_cmd(
3109         struct iscsi_conn *conn,
3110         struct iscsi_cmd *cmd,
3111         bool recovery)
3112 {
3113         int first_r2t = 1;
3114         u32 offset = 0, xfer_len = 0;
3115
3116         spin_lock_bh(&cmd->r2t_lock);
3117         if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3118                 spin_unlock_bh(&cmd->r2t_lock);
3119                 return 0;
3120         }
3121
3122         if (conn->sess->sess_ops->DataSequenceInOrder &&
3123             !recovery)
3124                 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3125
3126         while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3127                 if (conn->sess->sess_ops->DataSequenceInOrder) {
3128                         offset = cmd->r2t_offset;
3129
3130                         if (first_r2t && recovery) {
3131                                 int new_data_end = offset +
3132                                         conn->sess->sess_ops->MaxBurstLength -
3133                                         cmd->next_burst_len;
3134
3135                                 if (new_data_end > cmd->se_cmd.data_length)
3136                                         xfer_len = cmd->se_cmd.data_length - offset;
3137                                 else
3138                                         xfer_len =
3139                                                 conn->sess->sess_ops->MaxBurstLength -
3140                                                 cmd->next_burst_len;
3141                         } else {
3142                                 int new_data_end = offset +
3143                                         conn->sess->sess_ops->MaxBurstLength;
3144
3145                                 if (new_data_end > cmd->se_cmd.data_length)
3146                                         xfer_len = cmd->se_cmd.data_length - offset;
3147                                 else
3148                                         xfer_len = conn->sess->sess_ops->MaxBurstLength;
3149                         }
3150                         cmd->r2t_offset += xfer_len;
3151
3152                         if (cmd->r2t_offset == cmd->se_cmd.data_length)
3153                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3154                 } else {
3155                         struct iscsi_seq *seq;
3156
3157                         seq = iscsit_get_seq_holder_for_r2t(cmd);
3158                         if (!seq) {
3159                                 spin_unlock_bh(&cmd->r2t_lock);
3160                                 return -1;
3161                         }
3162
3163                         offset = seq->offset;
3164                         xfer_len = seq->xfer_len;
3165
3166                         if (cmd->seq_send_order == cmd->seq_count)
3167                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3168                 }
3169                 cmd->outstanding_r2ts++;
3170                 first_r2t = 0;
3171
3172                 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3173                         spin_unlock_bh(&cmd->r2t_lock);
3174                         return -1;
3175                 }
3176
3177                 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3178                         break;
3179         }
3180         spin_unlock_bh(&cmd->r2t_lock);
3181
3182         return 0;
3183 }
3184
3185 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3186                         bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3187 {
3188         if (inc_stat_sn)
3189                 cmd->stat_sn = conn->stat_sn++;
3190
3191         atomic_long_inc(&conn->sess->rsp_pdus);
3192
3193         memset(hdr, 0, ISCSI_HDR_LEN);
3194         hdr->opcode             = ISCSI_OP_SCSI_CMD_RSP;
3195         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3196         if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3197                 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3198                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3199         } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3200                 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3201                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3202         }
3203         hdr->response           = cmd->iscsi_response;
3204         hdr->cmd_status         = cmd->se_cmd.scsi_status;
3205         hdr->itt                = cmd->init_task_tag;
3206         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3207
3208         iscsit_increment_maxcmdsn(cmd, conn->sess);
3209         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3210         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3211
3212         pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3213                 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3214                 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3215                 cmd->se_cmd.scsi_status, conn->cid);
3216 }
3217 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3218
3219 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3220 {
3221         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3222         struct kvec *iov;
3223         u32 padding = 0, tx_size = 0;
3224         int iov_count = 0;
3225         bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3226
3227         iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3228
3229         iov = &cmd->iov_misc[0];
3230         iov[iov_count].iov_base = cmd->pdu;
3231         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3232         tx_size += ISCSI_HDR_LEN;
3233
3234         /*
3235          * Attach SENSE DATA payload to iSCSI Response PDU
3236          */
3237         if (cmd->se_cmd.sense_buffer &&
3238            ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3239             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3240                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3241                 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3242
3243                 padding         = -(cmd->se_cmd.scsi_sense_length) & 3;
3244                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3245                 iov[iov_count].iov_base = cmd->sense_buffer;
3246                 iov[iov_count++].iov_len =
3247                                 (cmd->se_cmd.scsi_sense_length + padding);
3248                 tx_size += cmd->se_cmd.scsi_sense_length;
3249
3250                 if (padding) {
3251                         memset(cmd->sense_buffer +
3252                                 cmd->se_cmd.scsi_sense_length, 0, padding);
3253                         tx_size += padding;
3254                         pr_debug("Adding %u bytes of padding to"
3255                                 " SENSE.\n", padding);
3256                 }
3257
3258                 if (conn->conn_ops->DataDigest) {
3259                         iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3260                                 cmd->sense_buffer,
3261                                 (cmd->se_cmd.scsi_sense_length + padding),
3262                                 0, NULL, (u8 *)&cmd->data_crc);
3263
3264                         iov[iov_count].iov_base    = &cmd->data_crc;
3265                         iov[iov_count++].iov_len     = ISCSI_CRC_LEN;
3266                         tx_size += ISCSI_CRC_LEN;
3267
3268                         pr_debug("Attaching CRC32 DataDigest for"
3269                                 " SENSE, %u bytes CRC 0x%08x\n",
3270                                 (cmd->se_cmd.scsi_sense_length + padding),
3271                                 cmd->data_crc);
3272                 }
3273
3274                 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3275                                 " Response PDU\n",
3276                                 cmd->se_cmd.scsi_sense_length);
3277         }
3278
3279         if (conn->conn_ops->HeaderDigest) {
3280                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3281
3282                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->pdu,
3283                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3284
3285                 iov[0].iov_len += ISCSI_CRC_LEN;
3286                 tx_size += ISCSI_CRC_LEN;
3287                 pr_debug("Attaching CRC32 HeaderDigest for Response"
3288                                 " PDU 0x%08x\n", *header_digest);
3289         }
3290
3291         cmd->iov_misc_count = iov_count;
3292         cmd->tx_size = tx_size;
3293
3294         return 0;
3295 }
3296
3297 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3298 {
3299         switch (se_tmr->response) {
3300         case TMR_FUNCTION_COMPLETE:
3301                 return ISCSI_TMF_RSP_COMPLETE;
3302         case TMR_TASK_DOES_NOT_EXIST:
3303                 return ISCSI_TMF_RSP_NO_TASK;
3304         case TMR_LUN_DOES_NOT_EXIST:
3305                 return ISCSI_TMF_RSP_NO_LUN;
3306         case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3307                 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3308         case TMR_FUNCTION_REJECTED:
3309         default:
3310                 return ISCSI_TMF_RSP_REJECTED;
3311         }
3312 }
3313
3314 void
3315 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3316                           struct iscsi_tm_rsp *hdr)
3317 {
3318         struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3319
3320         hdr->opcode             = ISCSI_OP_SCSI_TMFUNC_RSP;
3321         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
3322         hdr->response           = iscsit_convert_tcm_tmr_rsp(se_tmr);
3323         hdr->itt                = cmd->init_task_tag;
3324         cmd->stat_sn            = conn->stat_sn++;
3325         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3326
3327         iscsit_increment_maxcmdsn(cmd, conn->sess);
3328         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3329         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3330
3331         pr_debug("Built Task Management Response ITT: 0x%08x,"
3332                 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3333                 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3334 }
3335 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3336
3337 static int
3338 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3339 {
3340         struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3341         u32 tx_size = 0;
3342
3343         iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3344
3345         cmd->iov_misc[0].iov_base       = cmd->pdu;
3346         cmd->iov_misc[0].iov_len        = ISCSI_HDR_LEN;
3347         tx_size += ISCSI_HDR_LEN;
3348
3349         if (conn->conn_ops->HeaderDigest) {
3350                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3351
3352                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3353                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3354
3355                 cmd->iov_misc[0].iov_len += ISCSI_CRC_LEN;
3356                 tx_size += ISCSI_CRC_LEN;
3357                 pr_debug("Attaching CRC32 HeaderDigest for Task"
3358                         " Mgmt Response PDU 0x%08x\n", *header_digest);
3359         }
3360
3361         cmd->iov_misc_count = 1;
3362         cmd->tx_size = tx_size;
3363
3364         return 0;
3365 }
3366
3367 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3368 {
3369         bool ret = false;
3370
3371         if (np->np_sockaddr.ss_family == AF_INET6) {
3372                 const struct sockaddr_in6 sin6 = {
3373                         .sin6_addr = IN6ADDR_ANY_INIT };
3374                 struct sockaddr_in6 *sock_in6 =
3375                          (struct sockaddr_in6 *)&np->np_sockaddr;
3376
3377                 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3378                                 sin6.sin6_addr.s6_addr, 16))
3379                         ret = true;
3380         } else {
3381                 struct sockaddr_in * sock_in =
3382                         (struct sockaddr_in *)&np->np_sockaddr;
3383
3384                 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
3385                         ret = true;
3386         }
3387
3388         return ret;
3389 }
3390
3391 #define SENDTARGETS_BUF_LIMIT 32768U
3392
3393 static int
3394 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
3395                                   enum iscsit_transport_type network_transport)
3396 {
3397         char *payload = NULL;
3398         struct iscsi_conn *conn = cmd->conn;
3399         struct iscsi_portal_group *tpg;
3400         struct iscsi_tiqn *tiqn;
3401         struct iscsi_tpg_np *tpg_np;
3402         int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3403         int target_name_printed;
3404         unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3405         unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3406
3407         buffer_len = max(conn->conn_ops->MaxRecvDataSegmentLength,
3408                          SENDTARGETS_BUF_LIMIT);
3409
3410         payload = kzalloc(buffer_len, GFP_KERNEL);
3411         if (!payload) {
3412                 pr_err("Unable to allocate memory for sendtargets"
3413                                 " response.\n");
3414                 return -ENOMEM;
3415         }
3416         /*
3417          * Locate pointer to iqn./eui. string for IFC_SENDTARGETS_SINGLE
3418          * explicit case..
3419          */
3420         if (cmd->cmd_flags & IFC_SENDTARGETS_SINGLE) {
3421                 text_ptr = strchr(text_in, '=');
3422                 if (!text_ptr) {
3423                         pr_err("Unable to locate '=' string in text_in:"
3424                                " %s\n", text_in);
3425                         kfree(payload);
3426                         return -EINVAL;
3427                 }
3428                 /*
3429                  * Skip over '=' character..
3430                  */
3431                 text_ptr += 1;
3432         }
3433
3434         spin_lock(&tiqn_lock);
3435         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3436                 if ((cmd->cmd_flags & IFC_SENDTARGETS_SINGLE) &&
3437                      strcmp(tiqn->tiqn, text_ptr)) {
3438                         continue;
3439                 }
3440
3441                 target_name_printed = 0;
3442
3443                 spin_lock(&tiqn->tiqn_tpg_lock);
3444                 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3445
3446                         /* If demo_mode_discovery=0 and generate_node_acls=0
3447                          * (demo mode dislabed) do not return
3448                          * TargetName+TargetAddress unless a NodeACL exists.
3449                          */
3450
3451                         if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3452                             (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3453                             (!core_tpg_get_initiator_node_acl(&tpg->tpg_se_tpg,
3454                                 cmd->conn->sess->sess_ops->InitiatorName))) {
3455                                 continue;
3456                         }
3457
3458                         spin_lock(&tpg->tpg_state_lock);
3459                         if ((tpg->tpg_state == TPG_STATE_FREE) ||
3460                             (tpg->tpg_state == TPG_STATE_INACTIVE)) {
3461                                 spin_unlock(&tpg->tpg_state_lock);
3462                                 continue;
3463                         }
3464                         spin_unlock(&tpg->tpg_state_lock);
3465
3466                         spin_lock(&tpg->tpg_np_lock);
3467                         list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3468                                                 tpg_np_list) {
3469                                 struct iscsi_np *np = tpg_np->tpg_np;
3470                                 bool inaddr_any = iscsit_check_inaddr_any(np);
3471
3472                                 if (np->np_network_transport != network_transport)
3473                                         continue;
3474
3475                                 if (!target_name_printed) {
3476                                         len = sprintf(buf, "TargetName=%s",
3477                                                       tiqn->tiqn);
3478                                         len += 1;
3479
3480                                         if ((len + payload_len) > buffer_len) {
3481                                                 spin_unlock(&tpg->tpg_np_lock);
3482                                                 spin_unlock(&tiqn->tiqn_tpg_lock);
3483                                                 end_of_buf = 1;
3484                                                 goto eob;
3485                                         }
3486                                         memcpy(payload + payload_len, buf, len);
3487                                         payload_len += len;
3488                                         target_name_printed = 1;
3489                                 }
3490
3491                                 len = sprintf(buf, "TargetAddress="
3492                                         "%s:%hu,%hu",
3493                                         inaddr_any ? conn->local_ip : np->np_ip,
3494                                         inaddr_any ? conn->local_port : np->np_port,
3495                                         tpg->tpgt);
3496                                 len += 1;
3497
3498                                 if ((len + payload_len) > buffer_len) {
3499                                         spin_unlock(&tpg->tpg_np_lock);
3500                                         spin_unlock(&tiqn->tiqn_tpg_lock);
3501                                         end_of_buf = 1;
3502                                         goto eob;
3503                                 }
3504                                 memcpy(payload + payload_len, buf, len);
3505                                 payload_len += len;
3506                         }
3507                         spin_unlock(&tpg->tpg_np_lock);
3508                 }
3509                 spin_unlock(&tiqn->tiqn_tpg_lock);
3510 eob:
3511                 if (end_of_buf)
3512                         break;
3513
3514                 if (cmd->cmd_flags & IFC_SENDTARGETS_SINGLE)
3515                         break;
3516         }
3517         spin_unlock(&tiqn_lock);
3518
3519         cmd->buf_ptr = payload;
3520
3521         return payload_len;
3522 }
3523
3524 int
3525 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3526                       struct iscsi_text_rsp *hdr,
3527                       enum iscsit_transport_type network_transport)
3528 {
3529         int text_length, padding;
3530
3531         text_length = iscsit_build_sendtargets_response(cmd, network_transport);
3532         if (text_length < 0)
3533                 return text_length;
3534
3535         hdr->opcode = ISCSI_OP_TEXT_RSP;
3536         hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3537         padding = ((-text_length) & 3);
3538         hton24(hdr->dlength, text_length);
3539         hdr->itt = cmd->init_task_tag;
3540         hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3541         cmd->stat_sn = conn->stat_sn++;
3542         hdr->statsn = cpu_to_be32(cmd->stat_sn);
3543
3544         iscsit_increment_maxcmdsn(cmd, conn->sess);
3545         hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3546         hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
3547
3548         pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
3549                 " Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn,
3550                 text_length, conn->cid);
3551
3552         return text_length + padding;
3553 }
3554 EXPORT_SYMBOL(iscsit_build_text_rsp);
3555
3556 /*
3557  *      FIXME: Add support for F_BIT and C_BIT when the length is longer than
3558  *      MaxRecvDataSegmentLength.
3559  */
3560 static int iscsit_send_text_rsp(
3561         struct iscsi_cmd *cmd,
3562         struct iscsi_conn *conn)
3563 {
3564         struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3565         struct kvec *iov;
3566         u32 tx_size = 0;
3567         int text_length, iov_count = 0, rc;
3568
3569         rc = iscsit_build_text_rsp(cmd, conn, hdr, ISCSI_TCP);
3570         if (rc < 0)
3571                 return rc;
3572
3573         text_length = rc;
3574         iov = &cmd->iov_misc[0];
3575         iov[iov_count].iov_base = cmd->pdu;
3576         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3577         iov[iov_count].iov_base = cmd->buf_ptr;
3578         iov[iov_count++].iov_len = text_length;
3579
3580         tx_size += (ISCSI_HDR_LEN + text_length);
3581
3582         if (conn->conn_ops->HeaderDigest) {
3583                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3584
3585                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3586                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3587
3588                 iov[0].iov_len += ISCSI_CRC_LEN;
3589                 tx_size += ISCSI_CRC_LEN;
3590                 pr_debug("Attaching CRC32 HeaderDigest for"
3591                         " Text Response PDU 0x%08x\n", *header_digest);
3592         }
3593
3594         if (conn->conn_ops->DataDigest) {
3595                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
3596                                 cmd->buf_ptr, text_length,
3597                                 0, NULL, (u8 *)&cmd->data_crc);
3598
3599                 iov[iov_count].iov_base = &cmd->data_crc;
3600                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
3601                 tx_size += ISCSI_CRC_LEN;
3602
3603                 pr_debug("Attaching DataDigest for %u bytes of text"
3604                         " data, CRC 0x%08x\n", text_length,
3605                         cmd->data_crc);
3606         }
3607
3608         cmd->iov_misc_count = iov_count;
3609         cmd->tx_size = tx_size;
3610
3611         return 0;
3612 }
3613
3614 void
3615 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3616                     struct iscsi_reject *hdr)
3617 {
3618         hdr->opcode             = ISCSI_OP_REJECT;
3619         hdr->reason             = cmd->reject_reason;
3620         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3621         hton24(hdr->dlength, ISCSI_HDR_LEN);
3622         hdr->ffffffff           = cpu_to_be32(0xffffffff);
3623         cmd->stat_sn            = conn->stat_sn++;
3624         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3625         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3626         hdr->max_cmdsn          = cpu_to_be32(conn->sess->max_cmd_sn);
3627
3628 }
3629 EXPORT_SYMBOL(iscsit_build_reject);
3630
3631 static int iscsit_send_reject(
3632         struct iscsi_cmd *cmd,
3633         struct iscsi_conn *conn)
3634 {
3635         struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3636         struct kvec *iov;
3637         u32 iov_count = 0, tx_size;
3638
3639         iscsit_build_reject(cmd, conn, hdr);
3640
3641         iov = &cmd->iov_misc[0];
3642         iov[iov_count].iov_base = cmd->pdu;
3643         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3644         iov[iov_count].iov_base = cmd->buf_ptr;
3645         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
3646
3647         tx_size = (ISCSI_HDR_LEN + ISCSI_HDR_LEN);
3648
3649         if (conn->conn_ops->HeaderDigest) {
3650                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
3651
3652                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, hdr,
3653                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)header_digest);
3654
3655                 iov[0].iov_len += ISCSI_CRC_LEN;
3656                 tx_size += ISCSI_CRC_LEN;
3657                 pr_debug("Attaching CRC32 HeaderDigest for"
3658                         " REJECT PDU 0x%08x\n", *header_digest);
3659         }
3660
3661         if (conn->conn_ops->DataDigest) {
3662                 iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, cmd->buf_ptr,
3663                                 ISCSI_HDR_LEN, 0, NULL, (u8 *)&cmd->data_crc);
3664
3665                 iov[iov_count].iov_base = &cmd->data_crc;
3666                 iov[iov_count++].iov_len  = ISCSI_CRC_LEN;
3667                 tx_size += ISCSI_CRC_LEN;
3668                 pr_debug("Attaching CRC32 DataDigest for REJECT"
3669                                 " PDU 0x%08x\n", cmd->data_crc);
3670         }
3671
3672         cmd->iov_misc_count = iov_count;
3673         cmd->tx_size = tx_size;
3674
3675         pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3676                 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3677
3678         return 0;
3679 }
3680
3681 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3682 {
3683         struct iscsi_thread_set *ts = conn->thread_set;
3684         int ord, cpu;
3685         /*
3686          * thread_id is assigned from iscsit_global->ts_bitmap from
3687          * within iscsi_thread_set.c:iscsi_allocate_thread_sets()
3688          *
3689          * Here we use thread_id to determine which CPU that this
3690          * iSCSI connection's iscsi_thread_set will be scheduled to
3691          * execute upon.
3692          */
3693         ord = ts->thread_id % cpumask_weight(cpu_online_mask);
3694         for_each_online_cpu(cpu) {
3695                 if (ord-- == 0) {
3696                         cpumask_set_cpu(cpu, conn->conn_cpumask);
3697                         return;
3698                 }
3699         }
3700         /*
3701          * This should never be reached..
3702          */
3703         dump_stack();
3704         cpumask_setall(conn->conn_cpumask);
3705 }
3706
3707 static inline void iscsit_thread_check_cpumask(
3708         struct iscsi_conn *conn,
3709         struct task_struct *p,
3710         int mode)
3711 {
3712         /*
3713          * mode == 1 signals iscsi_target_tx_thread() usage.
3714          * mode == 0 signals iscsi_target_rx_thread() usage.
3715          */
3716         if (mode == 1) {
3717                 if (!conn->conn_tx_reset_cpumask)
3718                         return;
3719                 conn->conn_tx_reset_cpumask = 0;
3720         } else {
3721                 if (!conn->conn_rx_reset_cpumask)
3722                         return;
3723                 conn->conn_rx_reset_cpumask = 0;
3724         }
3725         /*
3726          * Update the CPU mask for this single kthread so that
3727          * both TX and RX kthreads are scheduled to run on the
3728          * same CPU.
3729          */
3730         set_cpus_allowed_ptr(p, conn->conn_cpumask);
3731 }
3732
3733 static int
3734 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3735 {
3736         int ret;
3737
3738         switch (state) {
3739         case ISTATE_SEND_R2T:
3740                 ret = iscsit_send_r2t(cmd, conn);
3741                 if (ret < 0)
3742                         goto err;
3743                 break;
3744         case ISTATE_REMOVE:
3745                 spin_lock_bh(&conn->cmd_lock);
3746                 list_del_init(&cmd->i_conn_node);
3747                 spin_unlock_bh(&conn->cmd_lock);
3748
3749                 iscsit_free_cmd(cmd, false);
3750                 break;
3751         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3752                 iscsit_mod_nopin_response_timer(conn);
3753                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3754                 if (ret < 0)
3755                         goto err;
3756                 break;
3757         case ISTATE_SEND_NOPIN_NO_RESPONSE:
3758                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3759                 if (ret < 0)
3760                         goto err;
3761                 break;
3762         default:
3763                 pr_err("Unknown Opcode: 0x%02x ITT:"
3764                        " 0x%08x, i_state: %d on CID: %hu\n",
3765                        cmd->iscsi_opcode, cmd->init_task_tag, state,
3766                        conn->cid);
3767                 goto err;
3768         }
3769
3770         return 0;
3771
3772 err:
3773         return -1;
3774 }
3775
3776 static int
3777 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3778 {
3779         struct iscsit_transport *t = conn->conn_transport;
3780         struct iscsi_queue_req *qr;
3781         struct iscsi_cmd *cmd;
3782         u8 state;
3783         int ret;
3784
3785         while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3786                 atomic_set(&conn->check_immediate_queue, 0);
3787                 cmd = qr->cmd;
3788                 state = qr->state;
3789                 kmem_cache_free(lio_qr_cache, qr);
3790
3791                 ret = t->iscsit_immediate_queue(conn, cmd, state);
3792                 if (ret < 0)
3793                         return ret;
3794         }
3795
3796         return 0;
3797 }
3798
3799 static int
3800 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3801 {
3802         int ret;
3803
3804 check_rsp_state:
3805         switch (state) {
3806         case ISTATE_SEND_DATAIN:
3807                 ret = iscsit_send_datain(cmd, conn);
3808                 if (ret < 0)
3809                         goto err;
3810                 else if (!ret)
3811                         /* more drs */
3812                         goto check_rsp_state;
3813                 else if (ret == 1) {
3814                         /* all done */
3815                         spin_lock_bh(&cmd->istate_lock);
3816                         cmd->i_state = ISTATE_SENT_STATUS;
3817                         spin_unlock_bh(&cmd->istate_lock);
3818
3819                         if (atomic_read(&conn->check_immediate_queue))
3820                                 return 1;
3821
3822                         return 0;
3823                 } else if (ret == 2) {
3824                         /* Still must send status,
3825                            SCF_TRANSPORT_TASK_SENSE was set */
3826                         spin_lock_bh(&cmd->istate_lock);
3827                         cmd->i_state = ISTATE_SEND_STATUS;
3828                         spin_unlock_bh(&cmd->istate_lock);
3829                         state = ISTATE_SEND_STATUS;
3830                         goto check_rsp_state;
3831                 }
3832
3833                 break;
3834         case ISTATE_SEND_STATUS:
3835         case ISTATE_SEND_STATUS_RECOVERY:
3836                 ret = iscsit_send_response(cmd, conn);
3837                 break;
3838         case ISTATE_SEND_LOGOUTRSP:
3839                 ret = iscsit_send_logout(cmd, conn);
3840                 break;
3841         case ISTATE_SEND_ASYNCMSG:
3842                 ret = iscsit_send_conn_drop_async_message(
3843                         cmd, conn);
3844                 break;
3845         case ISTATE_SEND_NOPIN:
3846                 ret = iscsit_send_nopin(cmd, conn);
3847                 break;
3848         case ISTATE_SEND_REJECT:
3849                 ret = iscsit_send_reject(cmd, conn);
3850                 break;
3851         case ISTATE_SEND_TASKMGTRSP:
3852                 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3853                 if (ret != 0)
3854                         break;
3855                 ret = iscsit_tmr_post_handler(cmd, conn);
3856                 if (ret != 0)
3857                         iscsit_fall_back_to_erl0(conn->sess);
3858                 break;
3859         case ISTATE_SEND_TEXTRSP:
3860                 ret = iscsit_send_text_rsp(cmd, conn);
3861                 break;
3862         default:
3863                 pr_err("Unknown Opcode: 0x%02x ITT:"
3864                        " 0x%08x, i_state: %d on CID: %hu\n",
3865                        cmd->iscsi_opcode, cmd->init_task_tag,
3866                        state, conn->cid);
3867                 goto err;
3868         }
3869         if (ret < 0)
3870                 goto err;
3871
3872         if (iscsit_send_tx_data(cmd, conn, 1) < 0) {
3873                 iscsit_tx_thread_wait_for_tcp(conn);
3874                 iscsit_unmap_iovec(cmd);
3875                 goto err;
3876         }
3877         iscsit_unmap_iovec(cmd);
3878
3879         switch (state) {
3880         case ISTATE_SEND_LOGOUTRSP:
3881                 if (!iscsit_logout_post_handler(cmd, conn))
3882                         goto restart;
3883                 /* fall through */
3884         case ISTATE_SEND_STATUS:
3885         case ISTATE_SEND_ASYNCMSG:
3886         case ISTATE_SEND_NOPIN:
3887         case ISTATE_SEND_STATUS_RECOVERY:
3888         case ISTATE_SEND_TEXTRSP:
3889         case ISTATE_SEND_TASKMGTRSP:
3890         case ISTATE_SEND_REJECT:
3891                 spin_lock_bh(&cmd->istate_lock);
3892                 cmd->i_state = ISTATE_SENT_STATUS;
3893                 spin_unlock_bh(&cmd->istate_lock);
3894                 break;
3895         default:
3896                 pr_err("Unknown Opcode: 0x%02x ITT:"
3897                        " 0x%08x, i_state: %d on CID: %hu\n",
3898                        cmd->iscsi_opcode, cmd->init_task_tag,
3899                        cmd->i_state, conn->cid);
3900                 goto err;
3901         }
3902
3903         if (atomic_read(&conn->check_immediate_queue))
3904                 return 1;
3905
3906         return 0;
3907
3908 err:
3909         return -1;
3910 restart:
3911         return -EAGAIN;
3912 }
3913
3914 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3915 {
3916         struct iscsit_transport *t = conn->conn_transport;
3917         struct iscsi_queue_req *qr;
3918         struct iscsi_cmd *cmd;
3919         u8 state;
3920         int ret;
3921
3922         while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3923                 cmd = qr->cmd;
3924                 state = qr->state;
3925                 kmem_cache_free(lio_qr_cache, qr);
3926
3927                 ret = t->iscsit_response_queue(conn, cmd, state);
3928                 if (ret == 1 || ret < 0)
3929                         return ret;
3930         }
3931
3932         return 0;
3933 }
3934
3935 int iscsi_target_tx_thread(void *arg)
3936 {
3937         int ret = 0;
3938         struct iscsi_conn *conn;
3939         struct iscsi_thread_set *ts = arg;
3940         /*
3941          * Allow ourselves to be interrupted by SIGINT so that a
3942          * connection recovery / failure event can be triggered externally.
3943          */
3944         allow_signal(SIGINT);
3945
3946 restart:
3947         conn = iscsi_tx_thread_pre_handler(ts);
3948         if (!conn)
3949                 goto out;
3950
3951         ret = 0;
3952
3953         while (!kthread_should_stop()) {
3954                 /*
3955                  * Ensure that both TX and RX per connection kthreads
3956                  * are scheduled to run on the same CPU.
3957                  */
3958                 iscsit_thread_check_cpumask(conn, current, 1);
3959
3960                 wait_event_interruptible(conn->queues_wq,
3961                                          !iscsit_conn_all_queues_empty(conn) ||
3962                                          ts->status == ISCSI_THREAD_SET_RESET);
3963
3964                 if ((ts->status == ISCSI_THREAD_SET_RESET) ||
3965                      signal_pending(current))
3966                         goto transport_err;
3967
3968 get_immediate:
3969                 ret = iscsit_handle_immediate_queue(conn);
3970                 if (ret < 0)
3971                         goto transport_err;
3972
3973                 ret = iscsit_handle_response_queue(conn);
3974                 if (ret == 1)
3975                         goto get_immediate;
3976                 else if (ret == -EAGAIN)
3977                         goto restart;
3978                 else if (ret < 0)
3979                         goto transport_err;
3980         }
3981
3982 transport_err:
3983         iscsit_take_action_for_connection_exit(conn);
3984         goto restart;
3985 out:
3986         return 0;
3987 }
3988
3989 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3990 {
3991         struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3992         struct iscsi_cmd *cmd;
3993         int ret = 0;
3994
3995         switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3996         case ISCSI_OP_SCSI_CMD:
3997                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3998                 if (!cmd)
3999                         goto reject;
4000
4001                 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
4002                 break;
4003         case ISCSI_OP_SCSI_DATA_OUT:
4004                 ret = iscsit_handle_data_out(conn, buf);
4005                 break;
4006         case ISCSI_OP_NOOP_OUT:
4007                 cmd = NULL;
4008                 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
4009                         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4010                         if (!cmd)
4011                                 goto reject;
4012                 }
4013                 ret = iscsit_handle_nop_out(conn, cmd, buf);
4014                 break;
4015         case ISCSI_OP_SCSI_TMFUNC:
4016                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4017                 if (!cmd)
4018                         goto reject;
4019
4020                 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
4021                 break;
4022         case ISCSI_OP_TEXT:
4023                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4024                 if (!cmd)
4025                         goto reject;
4026
4027                 ret = iscsit_handle_text_cmd(conn, cmd, buf);
4028                 break;
4029         case ISCSI_OP_LOGOUT:
4030                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
4031                 if (!cmd)
4032                         goto reject;
4033
4034                 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
4035                 if (ret > 0)
4036                         wait_for_completion_timeout(&conn->conn_logout_comp,
4037                                         SECONDS_FOR_LOGOUT_COMP * HZ);
4038                 break;
4039         case ISCSI_OP_SNACK:
4040                 ret = iscsit_handle_snack(conn, buf);
4041                 break;
4042         default:
4043                 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
4044                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
4045                         pr_err("Cannot recover from unknown"
4046                         " opcode while ERL=0, closing iSCSI connection.\n");
4047                         return -1;
4048                 }
4049                 if (!conn->conn_ops->OFMarker) {
4050                         pr_err("Unable to recover from unknown"
4051                         " opcode while OFMarker=No, closing iSCSI"
4052                                 " connection.\n");
4053                         return -1;
4054                 }
4055                 if (iscsit_recover_from_unknown_opcode(conn) < 0) {
4056                         pr_err("Unable to recover from unknown"
4057                                 " opcode, closing iSCSI connection.\n");
4058                         return -1;
4059                 }
4060                 break;
4061         }
4062
4063         return ret;
4064 reject:
4065         return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
4066 }
4067
4068 int iscsi_target_rx_thread(void *arg)
4069 {
4070         int ret;
4071         u8 buffer[ISCSI_HDR_LEN], opcode;
4072         u32 checksum = 0, digest = 0;
4073         struct iscsi_conn *conn = NULL;
4074         struct iscsi_thread_set *ts = arg;
4075         struct kvec iov;
4076         /*
4077          * Allow ourselves to be interrupted by SIGINT so that a
4078          * connection recovery / failure event can be triggered externally.
4079          */
4080         allow_signal(SIGINT);
4081
4082 restart:
4083         conn = iscsi_rx_thread_pre_handler(ts);
4084         if (!conn)
4085                 goto out;
4086
4087         if (conn->conn_transport->transport_type == ISCSI_INFINIBAND) {
4088                 struct completion comp;
4089                 int rc;
4090
4091                 init_completion(&comp);
4092                 rc = wait_for_completion_interruptible(&comp);
4093                 if (rc < 0)
4094                         goto transport_err;
4095
4096                 goto out;
4097         }
4098
4099         while (!kthread_should_stop()) {
4100                 /*
4101                  * Ensure that both TX and RX per connection kthreads
4102                  * are scheduled to run on the same CPU.
4103                  */
4104                 iscsit_thread_check_cpumask(conn, current, 0);
4105
4106                 memset(buffer, 0, ISCSI_HDR_LEN);
4107                 memset(&iov, 0, sizeof(struct kvec));
4108
4109                 iov.iov_base    = buffer;
4110                 iov.iov_len     = ISCSI_HDR_LEN;
4111
4112                 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
4113                 if (ret != ISCSI_HDR_LEN) {
4114                         iscsit_rx_thread_wait_for_tcp(conn);
4115                         goto transport_err;
4116                 }
4117
4118                 if (conn->conn_ops->HeaderDigest) {
4119                         iov.iov_base    = &digest;
4120                         iov.iov_len     = ISCSI_CRC_LEN;
4121
4122                         ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
4123                         if (ret != ISCSI_CRC_LEN) {
4124                                 iscsit_rx_thread_wait_for_tcp(conn);
4125                                 goto transport_err;
4126                         }
4127
4128                         iscsit_do_crypto_hash_buf(&conn->conn_rx_hash,
4129                                         buffer, ISCSI_HDR_LEN,
4130                                         0, NULL, (u8 *)&checksum);
4131
4132                         if (digest != checksum) {
4133                                 pr_err("HeaderDigest CRC32C failed,"
4134                                         " received 0x%08x, computed 0x%08x\n",
4135                                         digest, checksum);
4136                                 /*
4137                                  * Set the PDU to 0xff so it will intentionally
4138                                  * hit default in the switch below.
4139                                  */
4140                                 memset(buffer, 0xff, ISCSI_HDR_LEN);
4141                                 atomic_long_inc(&conn->sess->conn_digest_errors);
4142                         } else {
4143                                 pr_debug("Got HeaderDigest CRC32C"
4144                                                 " 0x%08x\n", checksum);
4145                         }
4146                 }
4147
4148                 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4149                         goto transport_err;
4150
4151                 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4152
4153                 if (conn->sess->sess_ops->SessionType &&
4154                    ((!(opcode & ISCSI_OP_TEXT)) ||
4155                     (!(opcode & ISCSI_OP_LOGOUT)))) {
4156                         pr_err("Received illegal iSCSI Opcode: 0x%02x"
4157                         " while in Discovery Session, rejecting.\n", opcode);
4158                         iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4159                                           buffer);
4160                         goto transport_err;
4161                 }
4162
4163                 ret = iscsi_target_rx_opcode(conn, buffer);
4164                 if (ret < 0)
4165                         goto transport_err;
4166         }
4167
4168 transport_err:
4169         if (!signal_pending(current))
4170                 atomic_set(&conn->transport_failed, 1);
4171         iscsit_take_action_for_connection_exit(conn);
4172         goto restart;
4173 out:
4174         return 0;
4175 }
4176
4177 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4178 {
4179         struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4180         struct iscsi_session *sess = conn->sess;
4181         /*
4182          * We expect this function to only ever be called from either RX or TX
4183          * thread context via iscsit_close_connection() once the other context
4184          * has been reset -> returned sleeping pre-handler state.
4185          */
4186         spin_lock_bh(&conn->cmd_lock);
4187         list_for_each_entry_safe(cmd, cmd_tmp, &conn->conn_cmd_list, i_conn_node) {
4188
4189                 list_del_init(&cmd->i_conn_node);
4190                 spin_unlock_bh(&conn->cmd_lock);
4191
4192                 iscsit_increment_maxcmdsn(cmd, sess);
4193
4194                 iscsit_free_cmd(cmd, true);
4195
4196                 spin_lock_bh(&conn->cmd_lock);
4197         }
4198         spin_unlock_bh(&conn->cmd_lock);
4199 }
4200
4201 static void iscsit_stop_timers_for_cmds(
4202         struct iscsi_conn *conn)
4203 {
4204         struct iscsi_cmd *cmd;
4205
4206         spin_lock_bh(&conn->cmd_lock);
4207         list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4208                 if (cmd->data_direction == DMA_TO_DEVICE)
4209                         iscsit_stop_dataout_timer(cmd);
4210         }
4211         spin_unlock_bh(&conn->cmd_lock);
4212 }
4213
4214 int iscsit_close_connection(
4215         struct iscsi_conn *conn)
4216 {
4217         int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4218         struct iscsi_session    *sess = conn->sess;
4219
4220         pr_debug("Closing iSCSI connection CID %hu on SID:"
4221                 " %u\n", conn->cid, sess->sid);
4222         /*
4223          * Always up conn_logout_comp just in case the RX Thread is sleeping
4224          * and the logout response never got sent because the connection
4225          * failed.
4226          */
4227         complete(&conn->conn_logout_comp);
4228
4229         iscsi_release_thread_set(conn);
4230
4231         iscsit_stop_timers_for_cmds(conn);
4232         iscsit_stop_nopin_response_timer(conn);
4233         iscsit_stop_nopin_timer(conn);
4234
4235         if (conn->conn_transport->iscsit_wait_conn)
4236                 conn->conn_transport->iscsit_wait_conn(conn);
4237
4238         /*
4239          * During Connection recovery drop unacknowledged out of order
4240          * commands for this connection, and prepare the other commands
4241          * for realligence.
4242          *
4243          * During normal operation clear the out of order commands (but
4244          * do not free the struct iscsi_ooo_cmdsn's) and release all
4245          * struct iscsi_cmds.
4246          */
4247         if (atomic_read(&conn->connection_recovery)) {
4248                 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4249                 iscsit_prepare_cmds_for_realligance(conn);
4250         } else {
4251                 iscsit_clear_ooo_cmdsns_for_conn(conn);
4252                 iscsit_release_commands_from_conn(conn);
4253         }
4254         iscsit_free_queue_reqs_for_conn(conn);
4255
4256         /*
4257          * Handle decrementing session or connection usage count if
4258          * a logout response was not able to be sent because the
4259          * connection failed.  Fall back to Session Recovery here.
4260          */
4261         if (atomic_read(&conn->conn_logout_remove)) {
4262                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4263                         iscsit_dec_conn_usage_count(conn);
4264                         iscsit_dec_session_usage_count(sess);
4265                 }
4266                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4267                         iscsit_dec_conn_usage_count(conn);
4268
4269                 atomic_set(&conn->conn_logout_remove, 0);
4270                 atomic_set(&sess->session_reinstatement, 0);
4271                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4272         }
4273
4274         spin_lock_bh(&sess->conn_lock);
4275         list_del(&conn->conn_list);
4276
4277         /*
4278          * Attempt to let the Initiator know this connection failed by
4279          * sending an Connection Dropped Async Message on another
4280          * active connection.
4281          */
4282         if (atomic_read(&conn->connection_recovery))
4283                 iscsit_build_conn_drop_async_message(conn);
4284
4285         spin_unlock_bh(&sess->conn_lock);
4286
4287         /*
4288          * If connection reinstatement is being performed on this connection,
4289          * up the connection reinstatement semaphore that is being blocked on
4290          * in iscsit_cause_connection_reinstatement().
4291          */
4292         spin_lock_bh(&conn->state_lock);
4293         if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4294                 spin_unlock_bh(&conn->state_lock);
4295                 complete(&conn->conn_wait_comp);
4296                 wait_for_completion(&conn->conn_post_wait_comp);
4297                 spin_lock_bh(&conn->state_lock);
4298         }
4299
4300         /*
4301          * If connection reinstatement is being performed on this connection
4302          * by receiving a REMOVECONNFORRECOVERY logout request, up the
4303          * connection wait rcfr semaphore that is being blocked on
4304          * an iscsit_connection_reinstatement_rcfr().
4305          */
4306         if (atomic_read(&conn->connection_wait_rcfr)) {
4307                 spin_unlock_bh(&conn->state_lock);
4308                 complete(&conn->conn_wait_rcfr_comp);
4309                 wait_for_completion(&conn->conn_post_wait_comp);
4310                 spin_lock_bh(&conn->state_lock);
4311         }
4312         atomic_set(&conn->connection_reinstatement, 1);
4313         spin_unlock_bh(&conn->state_lock);
4314
4315         /*
4316          * If any other processes are accessing this connection pointer we
4317          * must wait until they have completed.
4318          */
4319         iscsit_check_conn_usage_count(conn);
4320
4321         if (conn->conn_rx_hash.tfm)
4322                 crypto_free_hash(conn->conn_rx_hash.tfm);
4323         if (conn->conn_tx_hash.tfm)
4324                 crypto_free_hash(conn->conn_tx_hash.tfm);
4325
4326         free_cpumask_var(conn->conn_cpumask);
4327
4328         kfree(conn->conn_ops);
4329         conn->conn_ops = NULL;
4330
4331         if (conn->sock)
4332                 sock_release(conn->sock);
4333
4334         if (conn->conn_transport->iscsit_free_conn)
4335                 conn->conn_transport->iscsit_free_conn(conn);
4336
4337         iscsit_put_transport(conn->conn_transport);
4338
4339         conn->thread_set = NULL;
4340
4341         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4342         conn->conn_state = TARG_CONN_STATE_FREE;
4343         kfree(conn);
4344
4345         spin_lock_bh(&sess->conn_lock);
4346         atomic_dec(&sess->nconn);
4347         pr_debug("Decremented iSCSI connection count to %hu from node:"
4348                 " %s\n", atomic_read(&sess->nconn),
4349                 sess->sess_ops->InitiatorName);
4350         /*
4351          * Make sure that if one connection fails in an non ERL=2 iSCSI
4352          * Session that they all fail.
4353          */
4354         if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4355              !atomic_read(&sess->session_logout))
4356                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4357
4358         /*
4359          * If this was not the last connection in the session, and we are
4360          * performing session reinstatement or falling back to ERL=0, call
4361          * iscsit_stop_session() without sleeping to shutdown the other
4362          * active connections.
4363          */
4364         if (atomic_read(&sess->nconn)) {
4365                 if (!atomic_read(&sess->session_reinstatement) &&
4366                     !atomic_read(&sess->session_fall_back_to_erl0)) {
4367                         spin_unlock_bh(&sess->conn_lock);
4368                         return 0;
4369                 }
4370                 if (!atomic_read(&sess->session_stop_active)) {
4371                         atomic_set(&sess->session_stop_active, 1);
4372                         spin_unlock_bh(&sess->conn_lock);
4373                         iscsit_stop_session(sess, 0, 0);
4374                         return 0;
4375                 }
4376                 spin_unlock_bh(&sess->conn_lock);
4377                 return 0;
4378         }
4379
4380         /*
4381          * If this was the last connection in the session and one of the
4382          * following is occurring:
4383          *
4384          * Session Reinstatement is not being performed, and are falling back
4385          * to ERL=0 call iscsit_close_session().
4386          *
4387          * Session Logout was requested.  iscsit_close_session() will be called
4388          * elsewhere.
4389          *
4390          * Session Continuation is not being performed, start the Time2Retain
4391          * handler and check if sleep_on_sess_wait_sem is active.
4392          */
4393         if (!atomic_read(&sess->session_reinstatement) &&
4394              atomic_read(&sess->session_fall_back_to_erl0)) {
4395                 spin_unlock_bh(&sess->conn_lock);
4396                 target_put_session(sess->se_sess);
4397
4398                 return 0;
4399         } else if (atomic_read(&sess->session_logout)) {
4400                 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4401                 sess->session_state = TARG_SESS_STATE_FREE;
4402                 spin_unlock_bh(&sess->conn_lock);
4403
4404                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4405                         complete(&sess->session_wait_comp);
4406
4407                 return 0;
4408         } else {
4409                 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4410                 sess->session_state = TARG_SESS_STATE_FAILED;
4411
4412                 if (!atomic_read(&sess->session_continuation)) {
4413                         spin_unlock_bh(&sess->conn_lock);
4414                         iscsit_start_time2retain_handler(sess);
4415                 } else
4416                         spin_unlock_bh(&sess->conn_lock);
4417
4418                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4419                         complete(&sess->session_wait_comp);
4420
4421                 return 0;
4422         }
4423         spin_unlock_bh(&sess->conn_lock);
4424
4425         return 0;
4426 }
4427
4428 int iscsit_close_session(struct iscsi_session *sess)
4429 {
4430         struct iscsi_portal_group *tpg = sess->tpg;
4431         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4432
4433         if (atomic_read(&sess->nconn)) {
4434                 pr_err("%d connection(s) still exist for iSCSI session"
4435                         " to %s\n", atomic_read(&sess->nconn),
4436                         sess->sess_ops->InitiatorName);
4437                 BUG();
4438         }
4439
4440         spin_lock_bh(&se_tpg->session_lock);
4441         atomic_set(&sess->session_logout, 1);
4442         atomic_set(&sess->session_reinstatement, 1);
4443         iscsit_stop_time2retain_timer(sess);
4444         spin_unlock_bh(&se_tpg->session_lock);
4445
4446         /*
4447          * transport_deregister_session_configfs() will clear the
4448          * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4449          * can be setting it again with __transport_register_session() in
4450          * iscsi_post_login_handler() again after the iscsit_stop_session()
4451          * completes in iscsi_np context.
4452          */
4453         transport_deregister_session_configfs(sess->se_sess);
4454
4455         /*
4456          * If any other processes are accessing this session pointer we must
4457          * wait until they have completed.  If we are in an interrupt (the
4458          * time2retain handler) and contain and active session usage count we
4459          * restart the timer and exit.
4460          */
4461         if (!in_interrupt()) {
4462                 if (iscsit_check_session_usage_count(sess) == 1)
4463                         iscsit_stop_session(sess, 1, 1);
4464         } else {
4465                 if (iscsit_check_session_usage_count(sess) == 2) {
4466                         atomic_set(&sess->session_logout, 0);
4467                         iscsit_start_time2retain_handler(sess);
4468                         return 0;
4469                 }
4470         }
4471
4472         transport_deregister_session(sess->se_sess);
4473
4474         if (sess->sess_ops->ErrorRecoveryLevel == 2)
4475                 iscsit_free_connection_recovery_entires(sess);
4476
4477         iscsit_free_all_ooo_cmdsns(sess);
4478
4479         spin_lock_bh(&se_tpg->session_lock);
4480         pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4481         sess->session_state = TARG_SESS_STATE_FREE;
4482         pr_debug("Released iSCSI session from node: %s\n",
4483                         sess->sess_ops->InitiatorName);
4484         tpg->nsessions--;
4485         if (tpg->tpg_tiqn)
4486                 tpg->tpg_tiqn->tiqn_nsessions--;
4487
4488         pr_debug("Decremented number of active iSCSI Sessions on"
4489                 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4490
4491         spin_lock(&sess_idr_lock);
4492         idr_remove(&sess_idr, sess->session_index);
4493         spin_unlock(&sess_idr_lock);
4494
4495         kfree(sess->sess_ops);
4496         sess->sess_ops = NULL;
4497         spin_unlock_bh(&se_tpg->session_lock);
4498
4499         kfree(sess);
4500         return 0;
4501 }
4502
4503 static void iscsit_logout_post_handler_closesession(
4504         struct iscsi_conn *conn)
4505 {
4506         struct iscsi_session *sess = conn->sess;
4507
4508         iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4509         iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4510
4511         atomic_set(&conn->conn_logout_remove, 0);
4512         complete(&conn->conn_logout_comp);
4513
4514         iscsit_dec_conn_usage_count(conn);
4515         iscsit_stop_session(sess, 1, 1);
4516         iscsit_dec_session_usage_count(sess);
4517         target_put_session(sess->se_sess);
4518 }
4519
4520 static void iscsit_logout_post_handler_samecid(
4521         struct iscsi_conn *conn)
4522 {
4523         iscsi_set_thread_clear(conn, ISCSI_CLEAR_TX_THREAD);
4524         iscsi_set_thread_set_signal(conn, ISCSI_SIGNAL_TX_THREAD);
4525
4526         atomic_set(&conn->conn_logout_remove, 0);
4527         complete(&conn->conn_logout_comp);
4528
4529         iscsit_cause_connection_reinstatement(conn, 1);
4530         iscsit_dec_conn_usage_count(conn);
4531 }
4532
4533 static void iscsit_logout_post_handler_diffcid(
4534         struct iscsi_conn *conn,
4535         u16 cid)
4536 {
4537         struct iscsi_conn *l_conn;
4538         struct iscsi_session *sess = conn->sess;
4539         bool conn_found = false;
4540
4541         if (!sess)
4542                 return;
4543
4544         spin_lock_bh(&sess->conn_lock);
4545         list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4546                 if (l_conn->cid == cid) {
4547                         iscsit_inc_conn_usage_count(l_conn);
4548                         conn_found = true;
4549                         break;
4550                 }
4551         }
4552         spin_unlock_bh(&sess->conn_lock);
4553
4554         if (!conn_found)
4555                 return;
4556
4557         if (l_conn->sock)
4558                 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4559
4560         spin_lock_bh(&l_conn->state_lock);
4561         pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4562         l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4563         spin_unlock_bh(&l_conn->state_lock);
4564
4565         iscsit_cause_connection_reinstatement(l_conn, 1);
4566         iscsit_dec_conn_usage_count(l_conn);
4567 }
4568
4569 /*
4570  *      Return of 0 causes the TX thread to restart.
4571  */
4572 int iscsit_logout_post_handler(
4573         struct iscsi_cmd *cmd,
4574         struct iscsi_conn *conn)
4575 {
4576         int ret = 0;
4577
4578         switch (cmd->logout_reason) {
4579         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4580                 switch (cmd->logout_response) {
4581                 case ISCSI_LOGOUT_SUCCESS:
4582                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4583                 default:
4584                         iscsit_logout_post_handler_closesession(conn);
4585                         break;
4586                 }
4587                 ret = 0;
4588                 break;
4589         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4590                 if (conn->cid == cmd->logout_cid) {
4591                         switch (cmd->logout_response) {
4592                         case ISCSI_LOGOUT_SUCCESS:
4593                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4594                         default:
4595                                 iscsit_logout_post_handler_samecid(conn);
4596                                 break;
4597                         }
4598                         ret = 0;
4599                 } else {
4600                         switch (cmd->logout_response) {
4601                         case ISCSI_LOGOUT_SUCCESS:
4602                                 iscsit_logout_post_handler_diffcid(conn,
4603                                         cmd->logout_cid);
4604                                 break;
4605                         case ISCSI_LOGOUT_CID_NOT_FOUND:
4606                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4607                         default:
4608                                 break;
4609                         }
4610                         ret = 1;
4611                 }
4612                 break;
4613         case ISCSI_LOGOUT_REASON_RECOVERY:
4614                 switch (cmd->logout_response) {
4615                 case ISCSI_LOGOUT_SUCCESS:
4616                 case ISCSI_LOGOUT_CID_NOT_FOUND:
4617                 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4618                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4619                 default:
4620                         break;
4621                 }
4622                 ret = 1;
4623                 break;
4624         default:
4625                 break;
4626
4627         }
4628         return ret;
4629 }
4630 EXPORT_SYMBOL(iscsit_logout_post_handler);
4631
4632 void iscsit_fail_session(struct iscsi_session *sess)
4633 {
4634         struct iscsi_conn *conn;
4635
4636         spin_lock_bh(&sess->conn_lock);
4637         list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4638                 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4639                 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4640         }
4641         spin_unlock_bh(&sess->conn_lock);
4642
4643         pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4644         sess->session_state = TARG_SESS_STATE_FAILED;
4645 }
4646
4647 int iscsit_free_session(struct iscsi_session *sess)
4648 {
4649         u16 conn_count = atomic_read(&sess->nconn);
4650         struct iscsi_conn *conn, *conn_tmp = NULL;
4651         int is_last;
4652
4653         spin_lock_bh(&sess->conn_lock);
4654         atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4655
4656         list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4657                         conn_list) {
4658                 if (conn_count == 0)
4659                         break;
4660
4661                 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4662                         is_last = 1;
4663                 } else {
4664                         iscsit_inc_conn_usage_count(conn_tmp);
4665                         is_last = 0;
4666                 }
4667                 iscsit_inc_conn_usage_count(conn);
4668
4669                 spin_unlock_bh(&sess->conn_lock);
4670                 iscsit_cause_connection_reinstatement(conn, 1);
4671                 spin_lock_bh(&sess->conn_lock);
4672
4673                 iscsit_dec_conn_usage_count(conn);
4674                 if (is_last == 0)
4675                         iscsit_dec_conn_usage_count(conn_tmp);
4676
4677                 conn_count--;
4678         }
4679
4680         if (atomic_read(&sess->nconn)) {
4681                 spin_unlock_bh(&sess->conn_lock);
4682                 wait_for_completion(&sess->session_wait_comp);
4683         } else
4684                 spin_unlock_bh(&sess->conn_lock);
4685
4686         target_put_session(sess->se_sess);
4687         return 0;
4688 }
4689
4690 void iscsit_stop_session(
4691         struct iscsi_session *sess,
4692         int session_sleep,
4693         int connection_sleep)
4694 {
4695         u16 conn_count = atomic_read(&sess->nconn);
4696         struct iscsi_conn *conn, *conn_tmp = NULL;
4697         int is_last;
4698
4699         spin_lock_bh(&sess->conn_lock);
4700         if (session_sleep)
4701                 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4702
4703         if (connection_sleep) {
4704                 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4705                                 conn_list) {
4706                         if (conn_count == 0)
4707                                 break;
4708
4709                         if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4710                                 is_last = 1;
4711                         } else {
4712                                 iscsit_inc_conn_usage_count(conn_tmp);
4713                                 is_last = 0;
4714                         }
4715                         iscsit_inc_conn_usage_count(conn);
4716
4717                         spin_unlock_bh(&sess->conn_lock);
4718                         iscsit_cause_connection_reinstatement(conn, 1);
4719                         spin_lock_bh(&sess->conn_lock);
4720
4721                         iscsit_dec_conn_usage_count(conn);
4722                         if (is_last == 0)
4723                                 iscsit_dec_conn_usage_count(conn_tmp);
4724                         conn_count--;
4725                 }
4726         } else {
4727                 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4728                         iscsit_cause_connection_reinstatement(conn, 0);
4729         }
4730
4731         if (session_sleep && atomic_read(&sess->nconn)) {
4732                 spin_unlock_bh(&sess->conn_lock);
4733                 wait_for_completion(&sess->session_wait_comp);
4734         } else
4735                 spin_unlock_bh(&sess->conn_lock);
4736 }
4737
4738 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4739 {
4740         struct iscsi_session *sess;
4741         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4742         struct se_session *se_sess, *se_sess_tmp;
4743         int session_count = 0;
4744
4745         spin_lock_bh(&se_tpg->session_lock);
4746         if (tpg->nsessions && !force) {
4747                 spin_unlock_bh(&se_tpg->session_lock);
4748                 return -1;
4749         }
4750
4751         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4752                         sess_list) {
4753                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4754
4755                 spin_lock(&sess->conn_lock);
4756                 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4757                     atomic_read(&sess->session_logout) ||
4758                     (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4759                         spin_unlock(&sess->conn_lock);
4760                         continue;
4761                 }
4762                 atomic_set(&sess->session_reinstatement, 1);
4763                 spin_unlock(&sess->conn_lock);
4764                 spin_unlock_bh(&se_tpg->session_lock);
4765
4766                 iscsit_free_session(sess);
4767                 spin_lock_bh(&se_tpg->session_lock);
4768
4769                 session_count++;
4770         }
4771         spin_unlock_bh(&se_tpg->session_lock);
4772
4773         pr_debug("Released %d iSCSI Session(s) from Target Portal"
4774                         " Group: %hu\n", session_count, tpg->tpgt);
4775         return 0;
4776 }
4777
4778 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4779 MODULE_VERSION("4.1.x");
4780 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4781 MODULE_LICENSE("GPL");
4782
4783 module_init(iscsi_target_init_module);
4784 module_exit(iscsi_target_cleanup_module);