drivers/target/iscsi/iscsi_target.c

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