kernel/drivers/target/iscsi/iscsi_target.c

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