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