drivers/target/iscsi/iscsi_target.c

   1 /*******************************************************************************
   2  * This file contains main functions related to the iSCSI Target Core Driver.
   3  *
   4  * (c) Copyright 2007-2013 Datera, Inc.
   5  *
   6  * Author: Nicholas A. Bellinger <nab@linux-iscsi.org>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  ******************************************************************************/
  18
  19 #include <crypto/hash.h>
  20 #include <linux/string.h>
  21 #include <linux/kthread.h>
  22 #include <linux/completion.h>
  23 #include <linux/module.h>
  24 #include <linux/vmalloc.h>
  25 #include <linux/idr.h>
  26 #include <asm/unaligned.h>
  27 #include <scsi/scsi_proto.h>
  28 #include <scsi/iscsi_proto.h>
  29 #include <scsi/scsi_tcq.h>
  30 #include <target/target_core_base.h>
  31 #include <target/target_core_fabric.h>
  32
  33 #include <target/iscsi/iscsi_target_core.h>
  34 #include "iscsi_target_parameters.h"
  35 #include "iscsi_target_seq_pdu_list.h"
  36 #include "iscsi_target_datain_values.h"
  37 #include "iscsi_target_erl0.h"
  38 #include "iscsi_target_erl1.h"
  39 #include "iscsi_target_erl2.h"
  40 #include "iscsi_target_login.h"
  41 #include "iscsi_target_tmr.h"
  42 #include "iscsi_target_tpg.h"
  43 #include "iscsi_target_util.h"
  44 #include "iscsi_target.h"
  45 #include "iscsi_target_device.h"
  46 #include <target/iscsi/iscsi_target_stat.h>
  47
  48 #include <target/iscsi/iscsi_transport.h>
  49
  50 static LIST_HEAD(g_tiqn_list);
  51 static LIST_HEAD(g_np_list);
  52 static DEFINE_SPINLOCK(tiqn_lock);
  53 static DEFINE_MUTEX(np_lock);
  54
  55 static struct idr tiqn_idr;
  56 struct idr sess_idr;
  57 struct mutex auth_id_lock;
  58 spinlock_t sess_idr_lock;
  59
  60 struct iscsit_global *iscsit_global;
  61
  62 struct kmem_cache *lio_qr_cache;
  63 struct kmem_cache *lio_dr_cache;
  64 struct kmem_cache *lio_ooo_cache;
  65 struct kmem_cache *lio_r2t_cache;
  66
  67 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
  68                         struct iscsi_scsi_req *, u32);
  69
  70 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
  71 {
  72         struct iscsi_tiqn *tiqn = NULL;
  73
  74         spin_lock(&tiqn_lock);
  75         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
  76                 if (!strcmp(tiqn->tiqn, buf)) {
  77
  78                         spin_lock(&tiqn->tiqn_state_lock);
  79                         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
  80                                 tiqn->tiqn_access_count++;
  81                                 spin_unlock(&tiqn->tiqn_state_lock);
  82                                 spin_unlock(&tiqn_lock);
  83                                 return tiqn;
  84                         }
  85                         spin_unlock(&tiqn->tiqn_state_lock);
  86                 }
  87         }
  88         spin_unlock(&tiqn_lock);
  89
  90         return NULL;
  91 }
  92
  93 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
  94 {
  95         spin_lock(&tiqn->tiqn_state_lock);
  96         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
  97                 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
  98                 spin_unlock(&tiqn->tiqn_state_lock);
  99                 return 0;
 100         }
 101         spin_unlock(&tiqn->tiqn_state_lock);
 102
 103         return -1;
 104 }
 105
 106 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
 107 {
 108         spin_lock(&tiqn->tiqn_state_lock);
 109         tiqn->tiqn_access_count--;
 110         spin_unlock(&tiqn->tiqn_state_lock);
 111 }
 112
 113 /*
 114  * Note that IQN formatting is expected to be done in userspace, and
 115  * no explict IQN format checks are done here.
 116  */
 117 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
 118 {
 119         struct iscsi_tiqn *tiqn = NULL;
 120         int ret;
 121
 122         if (strlen(buf) >= ISCSI_IQN_LEN) {
 123                 pr_err("Target IQN exceeds %d bytes\n",
 124                                 ISCSI_IQN_LEN);
 125                 return ERR_PTR(-EINVAL);
 126         }
 127
 128         tiqn = kzalloc(sizeof(struct iscsi_tiqn), GFP_KERNEL);
 129         if (!tiqn) {
 130                 pr_err("Unable to allocate struct iscsi_tiqn\n");
 131                 return ERR_PTR(-ENOMEM);
 132         }
 133
 134         sprintf(tiqn->tiqn, "%s", buf);
 135         INIT_LIST_HEAD(&tiqn->tiqn_list);
 136         INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
 137         spin_lock_init(&tiqn->tiqn_state_lock);
 138         spin_lock_init(&tiqn->tiqn_tpg_lock);
 139         spin_lock_init(&tiqn->sess_err_stats.lock);
 140         spin_lock_init(&tiqn->login_stats.lock);
 141         spin_lock_init(&tiqn->logout_stats.lock);
 142
 143         tiqn->tiqn_state = TIQN_STATE_ACTIVE;
 144
 145         idr_preload(GFP_KERNEL);
 146         spin_lock(&tiqn_lock);
 147
 148         ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
 149         if (ret < 0) {
 150                 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
 151                 spin_unlock(&tiqn_lock);
 152                 idr_preload_end();
 153                 kfree(tiqn);
 154                 return ERR_PTR(ret);
 155         }
 156         tiqn->tiqn_index = ret;
 157         list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
 158
 159         spin_unlock(&tiqn_lock);
 160         idr_preload_end();
 161
 162         pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
 163
 164         return tiqn;
 165
 166 }
 167
 168 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
 169 {
 170         /*
 171          * Wait for accesses to said struct iscsi_tiqn to end.
 172          */
 173         spin_lock(&tiqn->tiqn_state_lock);
 174         while (tiqn->tiqn_access_count != 0) {
 175                 spin_unlock(&tiqn->tiqn_state_lock);
 176                 msleep(10);
 177                 spin_lock(&tiqn->tiqn_state_lock);
 178         }
 179         spin_unlock(&tiqn->tiqn_state_lock);
 180 }
 181
 182 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
 183 {
 184         /*
 185          * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
 186          * while holding tiqn->tiqn_state_lock.  This means that all subsequent
 187          * attempts to access this struct iscsi_tiqn will fail from both transport
 188          * fabric and control code paths.
 189          */
 190         if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
 191                 pr_err("iscsit_set_tiqn_shutdown() failed\n");
 192                 return;
 193         }
 194
 195         iscsit_wait_for_tiqn(tiqn);
 196
 197         spin_lock(&tiqn_lock);
 198         list_del(&tiqn->tiqn_list);
 199         idr_remove(&tiqn_idr, tiqn->tiqn_index);
 200         spin_unlock(&tiqn_lock);
 201
 202         pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
 203                         tiqn->tiqn);
 204         kfree(tiqn);
 205 }
 206
 207 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
 208 {
 209         int ret;
 210         /*
 211          * Determine if the network portal is accepting storage traffic.
 212          */
 213         spin_lock_bh(&np->np_thread_lock);
 214         if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 215                 spin_unlock_bh(&np->np_thread_lock);
 216                 return -1;
 217         }
 218         spin_unlock_bh(&np->np_thread_lock);
 219         /*
 220          * Determine if the portal group is accepting storage traffic.
 221          */
 222         spin_lock_bh(&tpg->tpg_state_lock);
 223         if (tpg->tpg_state != TPG_STATE_ACTIVE) {
 224                 spin_unlock_bh(&tpg->tpg_state_lock);
 225                 return -1;
 226         }
 227         spin_unlock_bh(&tpg->tpg_state_lock);
 228
 229         /*
 230          * Here we serialize access across the TIQN+TPG Tuple.
 231          */
 232         ret = down_interruptible(&tpg->np_login_sem);
 233         if (ret != 0)
 234                 return -1;
 235
 236         spin_lock_bh(&tpg->tpg_state_lock);
 237         if (tpg->tpg_state != TPG_STATE_ACTIVE) {
 238                 spin_unlock_bh(&tpg->tpg_state_lock);
 239                 up(&tpg->np_login_sem);
 240                 return -1;
 241         }
 242         spin_unlock_bh(&tpg->tpg_state_lock);
 243
 244         return 0;
 245 }
 246
 247 void iscsit_login_kref_put(struct kref *kref)
 248 {
 249         struct iscsi_tpg_np *tpg_np = container_of(kref,
 250                                 struct iscsi_tpg_np, tpg_np_kref);
 251
 252         complete(&tpg_np->tpg_np_comp);
 253 }
 254
 255 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg,
 256                        struct iscsi_tpg_np *tpg_np)
 257 {
 258         struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
 259
 260         up(&tpg->np_login_sem);
 261
 262         if (tpg_np)
 263                 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
 264
 265         if (tiqn)
 266                 iscsit_put_tiqn_for_login(tiqn);
 267
 268         return 0;
 269 }
 270
 271 bool iscsit_check_np_match(
 272         struct sockaddr_storage *sockaddr,
 273         struct iscsi_np *np,
 274         int network_transport)
 275 {
 276         struct sockaddr_in *sock_in, *sock_in_e;
 277         struct sockaddr_in6 *sock_in6, *sock_in6_e;
 278         bool ip_match = false;
 279         u16 port, port_e;
 280
 281         if (sockaddr->ss_family == AF_INET6) {
 282                 sock_in6 = (struct sockaddr_in6 *)sockaddr;
 283                 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
 284
 285                 if (!memcmp(&sock_in6->sin6_addr.in6_u,
 286                             &sock_in6_e->sin6_addr.in6_u,
 287                             sizeof(struct in6_addr)))
 288                         ip_match = true;
 289
 290                 port = ntohs(sock_in6->sin6_port);
 291                 port_e = ntohs(sock_in6_e->sin6_port);
 292         } else {
 293                 sock_in = (struct sockaddr_in *)sockaddr;
 294                 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
 295
 296                 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
 297                         ip_match = true;
 298
 299                 port = ntohs(sock_in->sin_port);
 300                 port_e = ntohs(sock_in_e->sin_port);
 301         }
 302
 303         if (ip_match && (port_e == port) &&
 304             (np->np_network_transport == network_transport))
 305                 return true;
 306
 307         return false;
 308 }
 309
 310 /*
 311  * Called with mutex np_lock held
 312  */
 313 static struct iscsi_np *iscsit_get_np(
 314         struct sockaddr_storage *sockaddr,
 315         int network_transport)
 316 {
 317         struct iscsi_np *np;
 318         bool match;
 319
 320         list_for_each_entry(np, &g_np_list, np_list) {
 321                 spin_lock_bh(&np->np_thread_lock);
 322                 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 323                         spin_unlock_bh(&np->np_thread_lock);
 324                         continue;
 325                 }
 326
 327                 match = iscsit_check_np_match(sockaddr, np, network_transport);
 328                 if (match) {
 329                         /*
 330                          * Increment the np_exports reference count now to
 331                          * prevent iscsit_del_np() below from being called
 332                          * while iscsi_tpg_add_network_portal() is called.
 333                          */
 334                         np->np_exports++;
 335                         spin_unlock_bh(&np->np_thread_lock);
 336                         return np;
 337                 }
 338                 spin_unlock_bh(&np->np_thread_lock);
 339         }
 340
 341         return NULL;
 342 }
 343
 344 struct iscsi_np *iscsit_add_np(
 345         struct sockaddr_storage *sockaddr,
 346         int network_transport)
 347 {
 348         struct iscsi_np *np;
 349         int ret;
 350
 351         mutex_lock(&np_lock);
 352
 353         /*
 354          * Locate the existing struct iscsi_np if already active..
 355          */
 356         np = iscsit_get_np(sockaddr, network_transport);
 357         if (np) {
 358                 mutex_unlock(&np_lock);
 359                 return np;
 360         }
 361
 362         np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
 363         if (!np) {
 364                 pr_err("Unable to allocate memory for struct iscsi_np\n");
 365                 mutex_unlock(&np_lock);
 366                 return ERR_PTR(-ENOMEM);
 367         }
 368
 369         np->np_flags |= NPF_IP_NETWORK;
 370         np->np_network_transport = network_transport;
 371         spin_lock_init(&np->np_thread_lock);
 372         init_completion(&np->np_restart_comp);
 373         INIT_LIST_HEAD(&np->np_list);
 374
 375         ret = iscsi_target_setup_login_socket(np, sockaddr);
 376         if (ret != 0) {
 377                 kfree(np);
 378                 mutex_unlock(&np_lock);
 379                 return ERR_PTR(ret);
 380         }
 381
 382         np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
 383         if (IS_ERR(np->np_thread)) {
 384                 pr_err("Unable to create kthread: iscsi_np\n");
 385                 ret = PTR_ERR(np->np_thread);
 386                 kfree(np);
 387                 mutex_unlock(&np_lock);
 388                 return ERR_PTR(ret);
 389         }
 390         /*
 391          * Increment the np_exports reference count now to prevent
 392          * iscsit_del_np() below from being run while a new call to
 393          * iscsi_tpg_add_network_portal() for a matching iscsi_np is
 394          * active.  We don't need to hold np->np_thread_lock at this
 395          * point because iscsi_np has not been added to g_np_list yet.
 396          */
 397         np->np_exports = 1;
 398         np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
 399
 400         list_add_tail(&np->np_list, &g_np_list);
 401         mutex_unlock(&np_lock);
 402
 403         pr_debug("CORE[0] - Added Network Portal: %pISpc on %s\n",
 404                 &np->np_sockaddr, np->np_transport->name);
 405
 406         return np;
 407 }
 408
 409 int iscsit_reset_np_thread(
 410         struct iscsi_np *np,
 411         struct iscsi_tpg_np *tpg_np,
 412         struct iscsi_portal_group *tpg,
 413         bool shutdown)
 414 {
 415         spin_lock_bh(&np->np_thread_lock);
 416         if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
 417                 spin_unlock_bh(&np->np_thread_lock);
 418                 return 0;
 419         }
 420         np->np_thread_state = ISCSI_NP_THREAD_RESET;
 421
 422         if (np->np_thread) {
 423                 spin_unlock_bh(&np->np_thread_lock);
 424                 send_sig(SIGINT, np->np_thread, 1);
 425                 wait_for_completion(&np->np_restart_comp);
 426                 spin_lock_bh(&np->np_thread_lock);
 427         }
 428         spin_unlock_bh(&np->np_thread_lock);
 429
 430         if (tpg_np && shutdown) {
 431                 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
 432
 433                 wait_for_completion(&tpg_np->tpg_np_comp);
 434         }
 435
 436         return 0;
 437 }
 438
 439 static void iscsit_free_np(struct iscsi_np *np)
 440 {
 441         if (np->np_socket)
 442                 sock_release(np->np_socket);
 443 }
 444
 445 int iscsit_del_np(struct iscsi_np *np)
 446 {
 447         spin_lock_bh(&np->np_thread_lock);
 448         np->np_exports--;
 449         if (np->np_exports) {
 450                 np->enabled = true;
 451                 spin_unlock_bh(&np->np_thread_lock);
 452                 return 0;
 453         }
 454         np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
 455         spin_unlock_bh(&np->np_thread_lock);
 456
 457         if (np->np_thread) {
 458                 /*
 459                  * We need to send the signal to wakeup Linux/Net
 460                  * which may be sleeping in sock_accept()..
 461                  */
 462                 send_sig(SIGINT, np->np_thread, 1);
 463                 kthread_stop(np->np_thread);
 464                 np->np_thread = NULL;
 465         }
 466
 467         np->np_transport->iscsit_free_np(np);
 468
 469         mutex_lock(&np_lock);
 470         list_del(&np->np_list);
 471         mutex_unlock(&np_lock);
 472
 473         pr_debug("CORE[0] - Removed Network Portal: %pISpc on %s\n",
 474                 &np->np_sockaddr, np->np_transport->name);
 475
 476         iscsit_put_transport(np->np_transport);
 477         kfree(np);
 478         return 0;
 479 }
 480
 481 static void iscsit_get_rx_pdu(struct iscsi_conn *);
 482
 483 int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
 484 {
 485         iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
 486         return 0;
 487 }
 488 EXPORT_SYMBOL(iscsit_queue_rsp);
 489
 490 void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
 491 {
 492         bool scsi_cmd = (cmd->iscsi_opcode == ISCSI_OP_SCSI_CMD);
 493
 494         spin_lock_bh(&conn->cmd_lock);
 495         if (!list_empty(&cmd->i_conn_node) &&
 496             !(cmd->se_cmd.transport_state & CMD_T_FABRIC_STOP))
 497                 list_del_init(&cmd->i_conn_node);
 498         spin_unlock_bh(&conn->cmd_lock);
 499
 500         __iscsit_free_cmd(cmd, scsi_cmd, true);
 501 }
 502 EXPORT_SYMBOL(iscsit_aborted_task);
 503
 504 static void iscsit_do_crypto_hash_buf(struct ahash_request *, const void *,
 505                                       u32, u32, u8 *, u8 *);
 506 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *);
 507
 508 static int
 509 iscsit_xmit_nondatain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 510                           const void *data_buf, u32 data_buf_len)
 511 {
 512         struct iscsi_hdr *hdr = (struct iscsi_hdr *)cmd->pdu;
 513         struct kvec *iov;
 514         u32 niov = 0, tx_size = ISCSI_HDR_LEN;
 515         int ret;
 516
 517         iov = &cmd->iov_misc[0];
 518         iov[niov].iov_base      = cmd->pdu;
 519         iov[niov++].iov_len     = ISCSI_HDR_LEN;
 520
 521         if (conn->conn_ops->HeaderDigest) {
 522                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
 523
 524                 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, hdr,
 525                                           ISCSI_HDR_LEN, 0, NULL,
 526                                           (u8 *)header_digest);
 527
 528                 iov[0].iov_len += ISCSI_CRC_LEN;
 529                 tx_size += ISCSI_CRC_LEN;
 530                 pr_debug("Attaching CRC32C HeaderDigest"
 531                          " to opcode 0x%x 0x%08x\n",
 532                          hdr->opcode, *header_digest);
 533         }
 534
 535         if (data_buf_len) {
 536                 u32 padding = ((-data_buf_len) & 3);
 537
 538                 iov[niov].iov_base      = (void *)data_buf;
 539                 iov[niov++].iov_len     = data_buf_len;
 540                 tx_size += data_buf_len;
 541
 542                 if (padding != 0) {
 543                         iov[niov].iov_base = &cmd->pad_bytes;
 544                         iov[niov++].iov_len = padding;
 545                         tx_size += padding;
 546                         pr_debug("Attaching %u additional"
 547                                  " padding bytes.\n", padding);
 548                 }
 549
 550                 if (conn->conn_ops->DataDigest) {
 551                         iscsit_do_crypto_hash_buf(conn->conn_tx_hash,
 552                                                   data_buf, data_buf_len,
 553                                                   padding,
 554                                                   (u8 *)&cmd->pad_bytes,
 555                                                   (u8 *)&cmd->data_crc);
 556
 557                         iov[niov].iov_base = &cmd->data_crc;
 558                         iov[niov++].iov_len = ISCSI_CRC_LEN;
 559                         tx_size += ISCSI_CRC_LEN;
 560                         pr_debug("Attached DataDigest for %u"
 561                                  " bytes opcode 0x%x, CRC 0x%08x\n",
 562                                  data_buf_len, hdr->opcode, cmd->data_crc);
 563                 }
 564         }
 565
 566         cmd->iov_misc_count = niov;
 567         cmd->tx_size = tx_size;
 568
 569         ret = iscsit_send_tx_data(cmd, conn, 1);
 570         if (ret < 0) {
 571                 iscsit_tx_thread_wait_for_tcp(conn);
 572                 return ret;
 573         }
 574
 575         return 0;
 576 }
 577
 578 static int iscsit_map_iovec(struct iscsi_cmd *, struct kvec *, u32, u32);
 579 static void iscsit_unmap_iovec(struct iscsi_cmd *);
 580 static u32 iscsit_do_crypto_hash_sg(struct ahash_request *, struct iscsi_cmd *,
 581                                     u32, u32, u32, u8 *);
 582 static int
 583 iscsit_xmit_datain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 584                        const struct iscsi_datain *datain)
 585 {
 586         struct kvec *iov;
 587         u32 iov_count = 0, tx_size = 0;
 588         int ret, iov_ret;
 589
 590         iov = &cmd->iov_data[0];
 591         iov[iov_count].iov_base = cmd->pdu;
 592         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
 593         tx_size += ISCSI_HDR_LEN;
 594
 595         if (conn->conn_ops->HeaderDigest) {
 596                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
 597
 598                 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, cmd->pdu,
 599                                           ISCSI_HDR_LEN, 0, NULL,
 600                                           (u8 *)header_digest);
 601
 602                 iov[0].iov_len += ISCSI_CRC_LEN;
 603                 tx_size += ISCSI_CRC_LEN;
 604
 605                 pr_debug("Attaching CRC32 HeaderDigest for DataIN PDU 0x%08x\n",
 606                          *header_digest);
 607         }
 608
 609         iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
 610                                    datain->offset, datain->length);
 611         if (iov_ret < 0)
 612                 return -1;
 613
 614         iov_count += iov_ret;
 615         tx_size += datain->length;
 616
 617         cmd->padding = ((-datain->length) & 3);
 618         if (cmd->padding) {
 619                 iov[iov_count].iov_base         = cmd->pad_bytes;
 620                 iov[iov_count++].iov_len        = cmd->padding;
 621                 tx_size += cmd->padding;
 622
 623                 pr_debug("Attaching %u padding bytes\n", cmd->padding);
 624         }
 625
 626         if (conn->conn_ops->DataDigest) {
 627                 cmd->data_crc = iscsit_do_crypto_hash_sg(conn->conn_tx_hash,
 628                                                          cmd, datain->offset,
 629                                                          datain->length,
 630                                                          cmd->padding,
 631                                                          cmd->pad_bytes);
 632
 633                 iov[iov_count].iov_base = &cmd->data_crc;
 634                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
 635                 tx_size += ISCSI_CRC_LEN;
 636
 637                 pr_debug("Attached CRC32C DataDigest %d bytes, crc 0x%08x\n",
 638                          datain->length + cmd->padding, cmd->data_crc);
 639         }
 640
 641         cmd->iov_data_count = iov_count;
 642         cmd->tx_size = tx_size;
 643
 644         ret = iscsit_fe_sendpage_sg(cmd, conn);
 645
 646         iscsit_unmap_iovec(cmd);
 647
 648         if (ret < 0) {
 649                 iscsit_tx_thread_wait_for_tcp(conn);
 650                 return ret;
 651         }
 652
 653         return 0;
 654 }
 655
 656 static int iscsit_xmit_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 657                            struct iscsi_datain_req *dr, const void *buf,
 658                            u32 buf_len)
 659 {
 660         if (dr)
 661                 return iscsit_xmit_datain_pdu(conn, cmd, buf);
 662         else
 663                 return iscsit_xmit_nondatain_pdu(conn, cmd, buf, buf_len);
 664 }
 665
 666 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn)
 667 {
 668         return TARGET_PROT_NORMAL;
 669 }
 670
 671 static struct iscsit_transport iscsi_target_transport = {
 672         .name                   = "iSCSI/TCP",
 673         .transport_type         = ISCSI_TCP,
 674         .rdma_shutdown          = false,
 675         .owner                  = NULL,
 676         .iscsit_setup_np        = iscsit_setup_np,
 677         .iscsit_accept_np       = iscsit_accept_np,
 678         .iscsit_free_np         = iscsit_free_np,
 679         .iscsit_get_login_rx    = iscsit_get_login_rx,
 680         .iscsit_put_login_tx    = iscsit_put_login_tx,
 681         .iscsit_get_dataout     = iscsit_build_r2ts_for_cmd,
 682         .iscsit_immediate_queue = iscsit_immediate_queue,
 683         .iscsit_response_queue  = iscsit_response_queue,
 684         .iscsit_queue_data_in   = iscsit_queue_rsp,
 685         .iscsit_queue_status    = iscsit_queue_rsp,
 686         .iscsit_aborted_task    = iscsit_aborted_task,
 687         .iscsit_xmit_pdu        = iscsit_xmit_pdu,
 688         .iscsit_get_rx_pdu      = iscsit_get_rx_pdu,
 689         .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops,
 690 };
 691
 692 static int __init iscsi_target_init_module(void)
 693 {
 694         int ret = 0, size;
 695
 696         pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
 697
 698         iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
 699         if (!iscsit_global) {
 700                 pr_err("Unable to allocate memory for iscsit_global\n");
 701                 return -1;
 702         }
 703         spin_lock_init(&iscsit_global->ts_bitmap_lock);
 704         mutex_init(&auth_id_lock);
 705         spin_lock_init(&sess_idr_lock);
 706         idr_init(&tiqn_idr);
 707         idr_init(&sess_idr);
 708
 709         ret = target_register_template(&iscsi_ops);
 710         if (ret)
 711                 goto out;
 712
 713         size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long);
 714         iscsit_global->ts_bitmap = vzalloc(size);
 715         if (!iscsit_global->ts_bitmap) {
 716                 pr_err("Unable to allocate iscsit_global->ts_bitmap\n");
 717                 goto configfs_out;
 718         }
 719
 720         lio_qr_cache = kmem_cache_create("lio_qr_cache",
 721                         sizeof(struct iscsi_queue_req),
 722                         __alignof__(struct iscsi_queue_req), 0, NULL);
 723         if (!lio_qr_cache) {
 724                 pr_err("nable to kmem_cache_create() for"
 725                                 " lio_qr_cache\n");
 726                 goto bitmap_out;
 727         }
 728
 729         lio_dr_cache = kmem_cache_create("lio_dr_cache",
 730                         sizeof(struct iscsi_datain_req),
 731                         __alignof__(struct iscsi_datain_req), 0, NULL);
 732         if (!lio_dr_cache) {
 733                 pr_err("Unable to kmem_cache_create() for"
 734                                 " lio_dr_cache\n");
 735                 goto qr_out;
 736         }
 737
 738         lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
 739                         sizeof(struct iscsi_ooo_cmdsn),
 740                         __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
 741         if (!lio_ooo_cache) {
 742                 pr_err("Unable to kmem_cache_create() for"
 743                                 " lio_ooo_cache\n");
 744                 goto dr_out;
 745         }
 746
 747         lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
 748                         sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
 749                         0, NULL);
 750         if (!lio_r2t_cache) {
 751                 pr_err("Unable to kmem_cache_create() for"
 752                                 " lio_r2t_cache\n");
 753                 goto ooo_out;
 754         }
 755
 756         iscsit_register_transport(&iscsi_target_transport);
 757
 758         if (iscsit_load_discovery_tpg() < 0)
 759                 goto r2t_out;
 760
 761         return ret;
 762 r2t_out:
 763         iscsit_unregister_transport(&iscsi_target_transport);
 764         kmem_cache_destroy(lio_r2t_cache);
 765 ooo_out:
 766         kmem_cache_destroy(lio_ooo_cache);
 767 dr_out:
 768         kmem_cache_destroy(lio_dr_cache);
 769 qr_out:
 770         kmem_cache_destroy(lio_qr_cache);
 771 bitmap_out:
 772         vfree(iscsit_global->ts_bitmap);
 773 configfs_out:
 774         /* XXX: this probably wants it to be it's own unwind step.. */
 775         if (iscsit_global->discovery_tpg)
 776                 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
 777         target_unregister_template(&iscsi_ops);
 778 out:
 779         kfree(iscsit_global);
 780         return -ENOMEM;
 781 }
 782
 783 static void __exit iscsi_target_cleanup_module(void)
 784 {
 785         iscsit_release_discovery_tpg();
 786         iscsit_unregister_transport(&iscsi_target_transport);
 787         kmem_cache_destroy(lio_qr_cache);
 788         kmem_cache_destroy(lio_dr_cache);
 789         kmem_cache_destroy(lio_ooo_cache);
 790         kmem_cache_destroy(lio_r2t_cache);
 791
 792         /*
 793          * Shutdown discovery sessions and disable discovery TPG
 794          */
 795         if (iscsit_global->discovery_tpg)
 796                 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
 797
 798         target_unregister_template(&iscsi_ops);
 799
 800         vfree(iscsit_global->ts_bitmap);
 801         kfree(iscsit_global);
 802 }
 803
 804 int iscsit_add_reject(
 805         struct iscsi_conn *conn,
 806         u8 reason,
 807         unsigned char *buf)
 808 {
 809         struct iscsi_cmd *cmd;
 810
 811         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
 812         if (!cmd)
 813                 return -1;
 814
 815         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 816         cmd->reject_reason = reason;
 817
 818         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 819         if (!cmd->buf_ptr) {
 820                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 821                 iscsit_free_cmd(cmd, false);
 822                 return -1;
 823         }
 824
 825         spin_lock_bh(&conn->cmd_lock);
 826         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 827         spin_unlock_bh(&conn->cmd_lock);
 828
 829         cmd->i_state = ISTATE_SEND_REJECT;
 830         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 831
 832         return -1;
 833 }
 834 EXPORT_SYMBOL(iscsit_add_reject);
 835
 836 static int iscsit_add_reject_from_cmd(
 837         struct iscsi_cmd *cmd,
 838         u8 reason,
 839         bool add_to_conn,
 840         unsigned char *buf)
 841 {
 842         struct iscsi_conn *conn;
 843
 844         if (!cmd->conn) {
 845                 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
 846                                 cmd->init_task_tag);
 847                 return -1;
 848         }
 849         conn = cmd->conn;
 850
 851         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 852         cmd->reject_reason = reason;
 853
 854         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 855         if (!cmd->buf_ptr) {
 856                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 857                 iscsit_free_cmd(cmd, false);
 858                 return -1;
 859         }
 860
 861         if (add_to_conn) {
 862                 spin_lock_bh(&conn->cmd_lock);
 863                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 864                 spin_unlock_bh(&conn->cmd_lock);
 865         }
 866
 867         cmd->i_state = ISTATE_SEND_REJECT;
 868         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 869         /*
 870          * Perform the kref_put now if se_cmd has already been setup by
 871          * scsit_setup_scsi_cmd()
 872          */
 873         if (cmd->se_cmd.se_tfo != NULL) {
 874                 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
 875                 target_put_sess_cmd(&cmd->se_cmd);
 876         }
 877         return -1;
 878 }
 879
 880 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
 881                                  unsigned char *buf)
 882 {
 883         return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
 884 }
 885
 886 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
 887 {
 888         return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
 889 }
 890 EXPORT_SYMBOL(iscsit_reject_cmd);
 891
 892 /*
 893  * Map some portion of the allocated scatterlist to an iovec, suitable for
 894  * kernel sockets to copy data in/out.
 895  */
 896 static int iscsit_map_iovec(
 897         struct iscsi_cmd *cmd,
 898         struct kvec *iov,
 899         u32 data_offset,
 900         u32 data_length)
 901 {
 902         u32 i = 0;
 903         struct scatterlist *sg;
 904         unsigned int page_off;
 905
 906         /*
 907          * We know each entry in t_data_sg contains a page.
 908          */
 909         u32 ent = data_offset / PAGE_SIZE;
 910
 911         if (ent >= cmd->se_cmd.t_data_nents) {
 912                 pr_err("Initial page entry out-of-bounds\n");
 913                 return -1;
 914         }
 915
 916         sg = &cmd->se_cmd.t_data_sg[ent];
 917         page_off = (data_offset % PAGE_SIZE);
 918
 919         cmd->first_data_sg = sg;
 920         cmd->first_data_sg_off = page_off;
 921
 922         while (data_length) {
 923                 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
 924
 925                 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
 926                 iov[i].iov_len = cur_len;
 927
 928                 data_length -= cur_len;
 929                 page_off = 0;
 930                 sg = sg_next(sg);
 931                 i++;
 932         }
 933
 934         cmd->kmapped_nents = i;
 935
 936         return i;
 937 }
 938
 939 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
 940 {
 941         u32 i;
 942         struct scatterlist *sg;
 943
 944         sg = cmd->first_data_sg;
 945
 946         for (i = 0; i < cmd->kmapped_nents; i++)
 947                 kunmap(sg_page(&sg[i]));
 948 }
 949
 950 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
 951 {
 952         LIST_HEAD(ack_list);
 953         struct iscsi_cmd *cmd, *cmd_p;
 954
 955         conn->exp_statsn = exp_statsn;
 956
 957         if (conn->sess->sess_ops->RDMAExtensions)
 958                 return;
 959
 960         spin_lock_bh(&conn->cmd_lock);
 961         list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
 962                 spin_lock(&cmd->istate_lock);
 963                 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
 964                     iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
 965                         cmd->i_state = ISTATE_REMOVE;
 966                         spin_unlock(&cmd->istate_lock);
 967                         list_move_tail(&cmd->i_conn_node, &ack_list);
 968                         continue;
 969                 }
 970                 spin_unlock(&cmd->istate_lock);
 971         }
 972         spin_unlock_bh(&conn->cmd_lock);
 973
 974         list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
 975                 list_del_init(&cmd->i_conn_node);
 976                 iscsit_free_cmd(cmd, false);
 977         }
 978 }
 979
 980 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
 981 {
 982         u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
 983
 984         iov_count += ISCSI_IOV_DATA_BUFFER;
 985
 986         cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
 987         if (!cmd->iov_data) {
 988                 pr_err("Unable to allocate cmd->iov_data\n");
 989                 return -ENOMEM;
 990         }
 991
 992         cmd->orig_iov_data_count = iov_count;
 993         return 0;
 994 }
 995
 996 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 997                           unsigned char *buf)
 998 {
 999         int data_direction, payload_length;
1000         struct iscsi_scsi_req *hdr;
1001         int iscsi_task_attr;
1002         int sam_task_attr;
1003
1004         atomic_long_inc(&conn->sess->cmd_pdus);
1005
1006         hdr                     = (struct iscsi_scsi_req *) buf;
1007         payload_length          = ntoh24(hdr->dlength);
1008
1009         /* FIXME; Add checks for AdditionalHeaderSegment */
1010
1011         if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
1012             !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1013                 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
1014                                 " not set. Bad iSCSI Initiator.\n");
1015                 return iscsit_add_reject_cmd(cmd,
1016                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1017         }
1018
1019         if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
1020              (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
1021                 /*
1022                  * From RFC-3720 Section 10.3.1:
1023                  *
1024                  * "Either or both of R and W MAY be 1 when either the
1025                  *  Expected Data Transfer Length and/or Bidirectional Read
1026                  *  Expected Data Transfer Length are 0"
1027                  *
1028                  * For this case, go ahead and clear the unnecssary bits
1029                  * to avoid any confusion with ->data_direction.
1030                  */
1031                 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
1032                 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
1033
1034                 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
1035                         " set when Expected Data Transfer Length is 0 for"
1036                         " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
1037         }
1038
1039         if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
1040             !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
1041                 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
1042                         " MUST be set if Expected Data Transfer Length is not 0."
1043                         " Bad iSCSI Initiator\n");
1044                 return iscsit_add_reject_cmd(cmd,
1045                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1046         }
1047
1048         if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
1049             (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
1050                 pr_err("Bidirectional operations not supported!\n");
1051                 return iscsit_add_reject_cmd(cmd,
1052                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1053         }
1054
1055         if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1056                 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
1057                                 " Scsi Command PDU.\n");
1058                 return iscsit_add_reject_cmd(cmd,
1059                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1060         }
1061
1062         if (payload_length && !conn->sess->sess_ops->ImmediateData) {
1063                 pr_err("ImmediateData=No but DataSegmentLength=%u,"
1064                         " protocol error.\n", payload_length);
1065                 return iscsit_add_reject_cmd(cmd,
1066                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1067         }
1068
1069         if ((be32_to_cpu(hdr->data_length) == payload_length) &&
1070             (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
1071                 pr_err("Expected Data Transfer Length and Length of"
1072                         " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
1073                         " bit is not set protocol error\n");
1074                 return iscsit_add_reject_cmd(cmd,
1075                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1076         }
1077
1078         if (payload_length > be32_to_cpu(hdr->data_length)) {
1079                 pr_err("DataSegmentLength: %u is greater than"
1080                         " EDTL: %u, protocol error.\n", payload_length,
1081                                 hdr->data_length);
1082                 return iscsit_add_reject_cmd(cmd,
1083                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1084         }
1085
1086         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1087                 pr_err("DataSegmentLength: %u is greater than"
1088                         " MaxXmitDataSegmentLength: %u, protocol error.\n",
1089                         payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1090                 return iscsit_add_reject_cmd(cmd,
1091                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1092         }
1093
1094         if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
1095                 pr_err("DataSegmentLength: %u is greater than"
1096                         " FirstBurstLength: %u, protocol error.\n",
1097                         payload_length, conn->sess->sess_ops->FirstBurstLength);
1098                 return iscsit_add_reject_cmd(cmd,
1099                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1100         }
1101
1102         data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
1103                          (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
1104                           DMA_NONE;
1105
1106         cmd->data_direction = data_direction;
1107         iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
1108         /*
1109          * Figure out the SAM Task Attribute for the incoming SCSI CDB
1110          */
1111         if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
1112             (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
1113                 sam_task_attr = TCM_SIMPLE_TAG;
1114         else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
1115                 sam_task_attr = TCM_ORDERED_TAG;
1116         else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
1117                 sam_task_attr = TCM_HEAD_TAG;
1118         else if (iscsi_task_attr == ISCSI_ATTR_ACA)
1119                 sam_task_attr = TCM_ACA_TAG;
1120         else {
1121                 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
1122                         " TCM_SIMPLE_TAG\n", iscsi_task_attr);
1123                 sam_task_attr = TCM_SIMPLE_TAG;
1124         }
1125
1126         cmd->iscsi_opcode       = ISCSI_OP_SCSI_CMD;
1127         cmd->i_state            = ISTATE_NEW_CMD;
1128         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1129         cmd->immediate_data     = (payload_length) ? 1 : 0;
1130         cmd->unsolicited_data   = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
1131                                      (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
1132         if (cmd->unsolicited_data)
1133                 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
1134
1135         conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1136         if (hdr->flags & ISCSI_FLAG_CMD_READ)
1137                 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
1138         else
1139                 cmd->targ_xfer_tag = 0xFFFFFFFF;
1140         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1141         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1142         cmd->first_burst_len    = payload_length;
1143
1144         if (!conn->sess->sess_ops->RDMAExtensions &&
1145              cmd->data_direction == DMA_FROM_DEVICE) {
1146                 struct iscsi_datain_req *dr;
1147
1148                 dr = iscsit_allocate_datain_req();
1149                 if (!dr)
1150                         return iscsit_add_reject_cmd(cmd,
1151                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1152
1153                 iscsit_attach_datain_req(cmd, dr);
1154         }
1155
1156         /*
1157          * Initialize struct se_cmd descriptor from target_core_mod infrastructure
1158          */
1159         transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1160                         conn->sess->se_sess, be32_to_cpu(hdr->data_length),
1161                         cmd->data_direction, sam_task_attr,
1162                         cmd->sense_buffer + 2);
1163
1164         pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1165                 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
1166                 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1167                 conn->cid);
1168
1169         target_get_sess_cmd(&cmd->se_cmd, true);
1170
1171         cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
1172                                                      scsilun_to_int(&hdr->lun));
1173         if (cmd->sense_reason)
1174                 goto attach_cmd;
1175
1176         /* only used for printks or comparing with ->ref_task_tag */
1177         cmd->se_cmd.tag = (__force u32)cmd->init_task_tag;
1178         cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1179         if (cmd->sense_reason) {
1180                 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1181                         return iscsit_add_reject_cmd(cmd,
1182                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1183                 }
1184
1185                 goto attach_cmd;
1186         }
1187
1188         if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1189                 return iscsit_add_reject_cmd(cmd,
1190                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1191         }
1192
1193 attach_cmd:
1194         spin_lock_bh(&conn->cmd_lock);
1195         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1196         spin_unlock_bh(&conn->cmd_lock);
1197         /*
1198          * Check if we need to delay processing because of ALUA
1199          * Active/NonOptimized primary access state..
1200          */
1201         core_alua_check_nonop_delay(&cmd->se_cmd);
1202
1203         return 0;
1204 }
1205 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1206
1207 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1208 {
1209         iscsit_set_dataout_sequence_values(cmd);
1210
1211         spin_lock_bh(&cmd->dataout_timeout_lock);
1212         iscsit_start_dataout_timer(cmd, cmd->conn);
1213         spin_unlock_bh(&cmd->dataout_timeout_lock);
1214 }
1215 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1216
1217 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1218                             struct iscsi_scsi_req *hdr)
1219 {
1220         int cmdsn_ret = 0;
1221         /*
1222          * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1223          * the Immediate Bit is not set, and no Immediate
1224          * Data is attached.
1225          *
1226          * A PDU/CmdSN carrying Immediate Data can only
1227          * be processed after the DataCRC has passed.
1228          * If the DataCRC fails, the CmdSN MUST NOT
1229          * be acknowledged. (See below)
1230          */
1231         if (!cmd->immediate_data) {
1232                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1233                                         (unsigned char *)hdr, hdr->cmdsn);
1234                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1235                         return -1;
1236                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1237                         target_put_sess_cmd(&cmd->se_cmd);
1238                         return 0;
1239                 }
1240         }
1241
1242         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1243
1244         /*
1245          * If no Immediate Data is attached, it's OK to return now.
1246          */
1247         if (!cmd->immediate_data) {
1248                 if (!cmd->sense_reason && cmd->unsolicited_data)
1249                         iscsit_set_unsoliticed_dataout(cmd);
1250                 if (!cmd->sense_reason)
1251                         return 0;
1252
1253                 target_put_sess_cmd(&cmd->se_cmd);
1254                 return 0;
1255         }
1256
1257         /*
1258          * Early CHECK_CONDITIONs with ImmediateData never make it to command
1259          * execution.  These exceptions are processed in CmdSN order using
1260          * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1261          */
1262         if (cmd->sense_reason) {
1263                 if (cmd->reject_reason)
1264                         return 0;
1265
1266                 return 1;
1267         }
1268         /*
1269          * Call directly into transport_generic_new_cmd() to perform
1270          * the backend memory allocation.
1271          */
1272         cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1273         if (cmd->sense_reason)
1274                 return 1;
1275
1276         return 0;
1277 }
1278 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1279
1280 static int
1281 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1282                           bool dump_payload)
1283 {
1284         int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1285         /*
1286          * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1287          */
1288         if (dump_payload)
1289                 goto after_immediate_data;
1290
1291         immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1292                                         cmd->first_burst_len);
1293 after_immediate_data:
1294         if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1295                 /*
1296                  * A PDU/CmdSN carrying Immediate Data passed
1297                  * DataCRC, check against ExpCmdSN/MaxCmdSN if
1298                  * Immediate Bit is not set.
1299                  */
1300                 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1301                                         (unsigned char *)hdr, hdr->cmdsn);
1302                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1303                         return -1;
1304
1305                 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1306                         int rc;
1307
1308                         rc = iscsit_dump_data_payload(cmd->conn,
1309                                                       cmd->first_burst_len, 1);
1310                         target_put_sess_cmd(&cmd->se_cmd);
1311                         return rc;
1312                 } else if (cmd->unsolicited_data)
1313                         iscsit_set_unsoliticed_dataout(cmd);
1314
1315         } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1316                 /*
1317                  * Immediate Data failed DataCRC and ERL>=1,
1318                  * silently drop this PDU and let the initiator
1319                  * plug the CmdSN gap.
1320                  *
1321                  * FIXME: Send Unsolicited NOPIN with reserved
1322                  * TTT here to help the initiator figure out
1323                  * the missing CmdSN, although they should be
1324                  * intelligent enough to determine the missing
1325                  * CmdSN and issue a retry to plug the sequence.
1326                  */
1327                 cmd->i_state = ISTATE_REMOVE;
1328                 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1329         } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1330                 return -1;
1331
1332         return 0;
1333 }
1334
1335 static int
1336 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1337                            unsigned char *buf)
1338 {
1339         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1340         int rc, immed_data;
1341         bool dump_payload = false;
1342
1343         rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1344         if (rc < 0)
1345                 return 0;
1346         /*
1347          * Allocation iovecs needed for struct socket operations for
1348          * traditional iSCSI block I/O.
1349          */
1350         if (iscsit_allocate_iovecs(cmd) < 0) {
1351                 return iscsit_reject_cmd(cmd,
1352                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1353         }
1354         immed_data = cmd->immediate_data;
1355
1356         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1357         if (rc < 0)
1358                 return rc;
1359         else if (rc > 0)
1360                 dump_payload = true;
1361
1362         if (!immed_data)
1363                 return 0;
1364
1365         return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1366 }
1367
1368 static u32 iscsit_do_crypto_hash_sg(
1369         struct ahash_request *hash,
1370         struct iscsi_cmd *cmd,
1371         u32 data_offset,
1372         u32 data_length,
1373         u32 padding,
1374         u8 *pad_bytes)
1375 {
1376         u32 data_crc;
1377         struct scatterlist *sg;
1378         unsigned int page_off;
1379
1380         crypto_ahash_init(hash);
1381
1382         sg = cmd->first_data_sg;
1383         page_off = cmd->first_data_sg_off;
1384
1385         while (data_length) {
1386                 u32 cur_len = min_t(u32, data_length, (sg->length - page_off));
1387
1388                 ahash_request_set_crypt(hash, sg, NULL, cur_len);
1389                 crypto_ahash_update(hash);
1390
1391                 data_length -= cur_len;
1392                 page_off = 0;
1393                 /* iscsit_map_iovec has already checked for invalid sg pointers */
1394                 sg = sg_next(sg);
1395         }
1396
1397         if (padding) {
1398                 struct scatterlist pad_sg;
1399
1400                 sg_init_one(&pad_sg, pad_bytes, padding);
1401                 ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc,
1402                                         padding);
1403                 crypto_ahash_finup(hash);
1404         } else {
1405                 ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0);
1406                 crypto_ahash_final(hash);
1407         }
1408
1409         return data_crc;
1410 }
1411
1412 static void iscsit_do_crypto_hash_buf(
1413         struct ahash_request *hash,
1414         const void *buf,
1415         u32 payload_length,
1416         u32 padding,
1417         u8 *pad_bytes,
1418         u8 *data_crc)
1419 {
1420         struct scatterlist sg[2];
1421
1422         sg_init_table(sg, ARRAY_SIZE(sg));
1423         sg_set_buf(sg, buf, payload_length);
1424         sg_set_buf(sg + 1, pad_bytes, padding);
1425
1426         ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding);
1427
1428         crypto_ahash_digest(hash);
1429 }
1430
1431 int
1432 iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf,
1433                           struct iscsi_cmd **out_cmd)
1434 {
1435         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1436         struct iscsi_cmd *cmd = NULL;
1437         struct se_cmd *se_cmd;
1438         u32 payload_length = ntoh24(hdr->dlength);
1439         int rc;
1440
1441         if (!payload_length) {
1442                 pr_warn("DataOUT payload is ZERO, ignoring.\n");
1443                 return 0;
1444         }
1445
1446         /* iSCSI write */
1447         atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1448
1449         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1450                 pr_err("DataSegmentLength: %u is greater than"
1451                         " MaxXmitDataSegmentLength: %u\n", payload_length,
1452                         conn->conn_ops->MaxXmitDataSegmentLength);
1453                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1454                                          buf);
1455         }
1456
1457         cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1458                         payload_length);
1459         if (!cmd)
1460                 return 0;
1461
1462         pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1463                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1464                 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1465                 payload_length, conn->cid);
1466
1467         if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1468                 pr_err("Command ITT: 0x%08x received DataOUT after"
1469                         " last DataOUT received, dumping payload\n",
1470                         cmd->init_task_tag);
1471                 return iscsit_dump_data_payload(conn, payload_length, 1);
1472         }
1473
1474         if (cmd->data_direction != DMA_TO_DEVICE) {
1475                 pr_err("Command ITT: 0x%08x received DataOUT for a"
1476                         " NON-WRITE command.\n", cmd->init_task_tag);
1477                 return iscsit_dump_data_payload(conn, payload_length, 1);
1478         }
1479         se_cmd = &cmd->se_cmd;
1480         iscsit_mod_dataout_timer(cmd);
1481
1482         if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1483                 pr_err("DataOut Offset: %u, Length %u greater than"
1484                         " iSCSI Command EDTL %u, protocol error.\n",
1485                         hdr->offset, payload_length, cmd->se_cmd.data_length);
1486                 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1487         }
1488
1489         if (cmd->unsolicited_data) {
1490                 int dump_unsolicited_data = 0;
1491
1492                 if (conn->sess->sess_ops->InitialR2T) {
1493                         pr_err("Received unexpected unsolicited data"
1494                                 " while InitialR2T=Yes, protocol error.\n");
1495                         transport_send_check_condition_and_sense(&cmd->se_cmd,
1496                                         TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1497                         return -1;
1498                 }
1499                 /*
1500                  * Special case for dealing with Unsolicited DataOUT
1501                  * and Unsupported SAM WRITE Opcodes and SE resource allocation
1502                  * failures;
1503                  */
1504
1505                 /* Something's amiss if we're not in WRITE_PENDING state... */
1506                 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1507                 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1508                         dump_unsolicited_data = 1;
1509
1510                 if (dump_unsolicited_data) {
1511                         /*
1512                          * Check if a delayed TASK_ABORTED status needs to
1513                          * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1514                          * received with the unsolicited data out.
1515                          */
1516                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1517                                 iscsit_stop_dataout_timer(cmd);
1518
1519                         transport_check_aborted_status(se_cmd,
1520                                         (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1521                         return iscsit_dump_data_payload(conn, payload_length, 1);
1522                 }
1523         } else {
1524                 /*
1525                  * For the normal solicited data path:
1526                  *
1527                  * Check for a delayed TASK_ABORTED status and dump any
1528                  * incoming data out payload if one exists.  Also, when the
1529                  * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1530                  * data out sequence, we decrement outstanding_r2ts.  Once
1531                  * outstanding_r2ts reaches zero, go ahead and send the delayed
1532                  * TASK_ABORTED status.
1533                  */
1534                 if (se_cmd->transport_state & CMD_T_ABORTED) {
1535                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1536                                 if (--cmd->outstanding_r2ts < 1) {
1537                                         iscsit_stop_dataout_timer(cmd);
1538                                         transport_check_aborted_status(
1539                                                         se_cmd, 1);
1540                                 }
1541
1542                         return iscsit_dump_data_payload(conn, payload_length, 1);
1543                 }
1544         }
1545         /*
1546          * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1547          * within-command recovery checks before receiving the payload.
1548          */
1549         rc = iscsit_check_pre_dataout(cmd, buf);
1550         if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1551                 return 0;
1552         else if (rc == DATAOUT_CANNOT_RECOVER)
1553                 return -1;
1554
1555         *out_cmd = cmd;
1556         return 0;
1557 }
1558 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1559
1560 static int
1561 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1562                    struct iscsi_data *hdr)
1563 {
1564         struct kvec *iov;
1565         u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1566         u32 payload_length = ntoh24(hdr->dlength);
1567         int iov_ret, data_crc_failed = 0;
1568
1569         rx_size += payload_length;
1570         iov = &cmd->iov_data[0];
1571
1572         iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1573                                    payload_length);
1574         if (iov_ret < 0)
1575                 return -1;
1576
1577         iov_count += iov_ret;
1578
1579         padding = ((-payload_length) & 3);
1580         if (padding != 0) {
1581                 iov[iov_count].iov_base = cmd->pad_bytes;
1582                 iov[iov_count++].iov_len = padding;
1583                 rx_size += padding;
1584                 pr_debug("Receiving %u padding bytes.\n", padding);
1585         }
1586
1587         if (conn->conn_ops->DataDigest) {
1588                 iov[iov_count].iov_base = &checksum;
1589                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1590                 rx_size += ISCSI_CRC_LEN;
1591         }
1592
1593         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1594
1595         iscsit_unmap_iovec(cmd);
1596
1597         if (rx_got != rx_size)
1598                 return -1;
1599
1600         if (conn->conn_ops->DataDigest) {
1601                 u32 data_crc;
1602
1603                 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
1604                                                     be32_to_cpu(hdr->offset),
1605                                                     payload_length, padding,
1606                                                     cmd->pad_bytes);
1607
1608                 if (checksum != data_crc) {
1609                         pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1610                                 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1611                                 " does not match computed 0x%08x\n",
1612                                 hdr->itt, hdr->offset, payload_length,
1613                                 hdr->datasn, checksum, data_crc);
1614                         data_crc_failed = 1;
1615                 } else {
1616                         pr_debug("Got CRC32C DataDigest 0x%08x for"
1617                                 " %u bytes of Data Out\n", checksum,
1618                                 payload_length);
1619                 }
1620         }
1621
1622         return data_crc_failed;
1623 }
1624
1625 int
1626 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1627                              bool data_crc_failed)
1628 {
1629         struct iscsi_conn *conn = cmd->conn;
1630         int rc, ooo_cmdsn;
1631         /*
1632          * Increment post receive data and CRC values or perform
1633          * within-command recovery.
1634          */
1635         rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1636         if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1637                 return 0;
1638         else if (rc == DATAOUT_SEND_R2T) {
1639                 iscsit_set_dataout_sequence_values(cmd);
1640                 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1641         } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1642                 /*
1643                  * Handle extra special case for out of order
1644                  * Unsolicited Data Out.
1645                  */
1646                 spin_lock_bh(&cmd->istate_lock);
1647                 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1648                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1649                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1650                 spin_unlock_bh(&cmd->istate_lock);
1651
1652                 iscsit_stop_dataout_timer(cmd);
1653                 if (ooo_cmdsn)
1654                         return 0;
1655                 target_execute_cmd(&cmd->se_cmd);
1656                 return 0;
1657         } else /* DATAOUT_CANNOT_RECOVER */
1658                 return -1;
1659
1660         return 0;
1661 }
1662 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1663
1664 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1665 {
1666         struct iscsi_cmd *cmd = NULL;
1667         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1668         int rc;
1669         bool data_crc_failed = false;
1670
1671         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1672         if (rc < 0)
1673                 return 0;
1674         else if (!cmd)
1675                 return 0;
1676
1677         rc = iscsit_get_dataout(conn, cmd, hdr);
1678         if (rc < 0)
1679                 return rc;
1680         else if (rc > 0)
1681                 data_crc_failed = true;
1682
1683         return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1684 }
1685
1686 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1687                          struct iscsi_nopout *hdr)
1688 {
1689         u32 payload_length = ntoh24(hdr->dlength);
1690
1691         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1692                 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1693                 if (!cmd)
1694                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1695                                                  (unsigned char *)hdr);
1696
1697                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1698                                          (unsigned char *)hdr);
1699         }
1700
1701         if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1702                 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1703                         " not set, protocol error.\n");
1704                 if (!cmd)
1705                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1706                                                  (unsigned char *)hdr);
1707
1708                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1709                                          (unsigned char *)hdr);
1710         }
1711
1712         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1713                 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1714                         " greater than MaxXmitDataSegmentLength: %u, protocol"
1715                         " error.\n", payload_length,
1716                         conn->conn_ops->MaxXmitDataSegmentLength);
1717                 if (!cmd)
1718                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1719                                                  (unsigned char *)hdr);
1720
1721                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1722                                          (unsigned char *)hdr);
1723         }
1724
1725         pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1726                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1727                 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1728                 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1729                 payload_length);
1730         /*
1731          * This is not a response to a Unsolicited NopIN, which means
1732          * it can either be a NOPOUT ping request (with a valid ITT),
1733          * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1734          * Either way, make sure we allocate an struct iscsi_cmd, as both
1735          * can contain ping data.
1736          */
1737         if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1738                 cmd->iscsi_opcode       = ISCSI_OP_NOOP_OUT;
1739                 cmd->i_state            = ISTATE_SEND_NOPIN;
1740                 cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1741                                                 1 : 0);
1742                 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1743                 cmd->targ_xfer_tag      = 0xFFFFFFFF;
1744                 cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1745                 cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1746                 cmd->data_direction     = DMA_NONE;
1747         }
1748
1749         return 0;
1750 }
1751 EXPORT_SYMBOL(iscsit_setup_nop_out);
1752
1753 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1754                            struct iscsi_nopout *hdr)
1755 {
1756         struct iscsi_cmd *cmd_p = NULL;
1757         int cmdsn_ret = 0;
1758         /*
1759          * Initiator is expecting a NopIN ping reply..
1760          */
1761         if (hdr->itt != RESERVED_ITT) {
1762                 if (!cmd)
1763                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1764                                                 (unsigned char *)hdr);
1765
1766                 spin_lock_bh(&conn->cmd_lock);
1767                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1768                 spin_unlock_bh(&conn->cmd_lock);
1769
1770                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1771
1772                 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1773                         iscsit_add_cmd_to_response_queue(cmd, conn,
1774                                                          cmd->i_state);
1775                         return 0;
1776                 }
1777
1778                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1779                                 (unsigned char *)hdr, hdr->cmdsn);
1780                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1781                         return 0;
1782                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1783                         return -1;
1784
1785                 return 0;
1786         }
1787         /*
1788          * This was a response to a unsolicited NOPIN ping.
1789          */
1790         if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1791                 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1792                 if (!cmd_p)
1793                         return -EINVAL;
1794
1795                 iscsit_stop_nopin_response_timer(conn);
1796
1797                 cmd_p->i_state = ISTATE_REMOVE;
1798                 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1799
1800                 iscsit_start_nopin_timer(conn);
1801                 return 0;
1802         }
1803         /*
1804          * Otherwise, initiator is not expecting a NOPIN is response.
1805          * Just ignore for now.
1806          */
1807
1808         if (cmd)
1809                 iscsit_free_cmd(cmd, false);
1810
1811         return 0;
1812 }
1813 EXPORT_SYMBOL(iscsit_process_nop_out);
1814
1815 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1816                                  unsigned char *buf)
1817 {
1818         unsigned char *ping_data = NULL;
1819         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1820         struct kvec *iov = NULL;
1821         u32 payload_length = ntoh24(hdr->dlength);
1822         int ret;
1823
1824         ret = iscsit_setup_nop_out(conn, cmd, hdr);
1825         if (ret < 0)
1826                 return 0;
1827         /*
1828          * Handle NOP-OUT payload for traditional iSCSI sockets
1829          */
1830         if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1831                 u32 checksum, data_crc, padding = 0;
1832                 int niov = 0, rx_got, rx_size = payload_length;
1833
1834                 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1835                 if (!ping_data) {
1836                         pr_err("Unable to allocate memory for"
1837                                 " NOPOUT ping data.\n");
1838                         ret = -1;
1839                         goto out;
1840                 }
1841
1842                 iov = &cmd->iov_misc[0];
1843                 iov[niov].iov_base      = ping_data;
1844                 iov[niov++].iov_len     = payload_length;
1845
1846                 padding = ((-payload_length) & 3);
1847                 if (padding != 0) {
1848                         pr_debug("Receiving %u additional bytes"
1849                                 " for padding.\n", padding);
1850                         iov[niov].iov_base      = &cmd->pad_bytes;
1851                         iov[niov++].iov_len     = padding;
1852                         rx_size += padding;
1853                 }
1854                 if (conn->conn_ops->DataDigest) {
1855                         iov[niov].iov_base      = &checksum;
1856                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
1857                         rx_size += ISCSI_CRC_LEN;
1858                 }
1859
1860                 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1861                 if (rx_got != rx_size) {
1862                         ret = -1;
1863                         goto out;
1864                 }
1865
1866                 if (conn->conn_ops->DataDigest) {
1867                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
1868                                         ping_data, payload_length,
1869                                         padding, cmd->pad_bytes,
1870                                         (u8 *)&data_crc);
1871
1872                         if (checksum != data_crc) {
1873                                 pr_err("Ping data CRC32C DataDigest"
1874                                 " 0x%08x does not match computed 0x%08x\n",
1875                                         checksum, data_crc);
1876                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1877                                         pr_err("Unable to recover from"
1878                                         " NOPOUT Ping DataCRC failure while in"
1879                                                 " ERL=0.\n");
1880                                         ret = -1;
1881                                         goto out;
1882                                 } else {
1883                                         /*
1884                                          * Silently drop this PDU and let the
1885                                          * initiator plug the CmdSN gap.
1886                                          */
1887                                         pr_debug("Dropping NOPOUT"
1888                                         " Command CmdSN: 0x%08x due to"
1889                                         " DataCRC error.\n", hdr->cmdsn);
1890                                         ret = 0;
1891                                         goto out;
1892                                 }
1893                         } else {
1894                                 pr_debug("Got CRC32C DataDigest"
1895                                 " 0x%08x for %u bytes of ping data.\n",
1896                                         checksum, payload_length);
1897                         }
1898                 }
1899
1900                 ping_data[payload_length] = '\0';
1901                 /*
1902                  * Attach ping data to struct iscsi_cmd->buf_ptr.
1903                  */
1904                 cmd->buf_ptr = ping_data;
1905                 cmd->buf_ptr_size = payload_length;
1906
1907                 pr_debug("Got %u bytes of NOPOUT ping"
1908                         " data.\n", payload_length);
1909                 pr_debug("Ping Data: \"%s\"\n", ping_data);
1910         }
1911
1912         return iscsit_process_nop_out(conn, cmd, hdr);
1913 out:
1914         if (cmd)
1915                 iscsit_free_cmd(cmd, false);
1916
1917         kfree(ping_data);
1918         return ret;
1919 }
1920
1921 int
1922 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1923                            unsigned char *buf)
1924 {
1925         struct se_tmr_req *se_tmr;
1926         struct iscsi_tmr_req *tmr_req;
1927         struct iscsi_tm *hdr;
1928         int out_of_order_cmdsn = 0, ret;
1929         bool sess_ref = false;
1930         u8 function;
1931
1932         hdr                     = (struct iscsi_tm *) buf;
1933         hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1934         function = hdr->flags;
1935
1936         pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1937                 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1938                 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1939                 hdr->rtt, hdr->refcmdsn, conn->cid);
1940
1941         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1942             ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1943              hdr->rtt != RESERVED_ITT)) {
1944                 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1945                 hdr->rtt = RESERVED_ITT;
1946         }
1947
1948         if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1949                         !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1950                 pr_err("Task Management Request TASK_REASSIGN not"
1951                         " issued as immediate command, bad iSCSI Initiator"
1952                                 "implementation\n");
1953                 return iscsit_add_reject_cmd(cmd,
1954                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1955         }
1956         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1957             be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1958                 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1959
1960         cmd->data_direction = DMA_NONE;
1961
1962         cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1963         if (!cmd->tmr_req) {
1964                 pr_err("Unable to allocate memory for"
1965                         " Task Management command!\n");
1966                 return iscsit_add_reject_cmd(cmd,
1967                                              ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1968                                              buf);
1969         }
1970
1971         /*
1972          * TASK_REASSIGN for ERL=2 / connection stays inside of
1973          * LIO-Target $FABRIC_MOD
1974          */
1975         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
1976
1977                 u8 tcm_function;
1978                 int ret;
1979
1980                 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1981                                       conn->sess->se_sess, 0, DMA_NONE,
1982                                       TCM_SIMPLE_TAG, cmd->sense_buffer + 2);
1983
1984                 target_get_sess_cmd(&cmd->se_cmd, true);
1985                 sess_ref = true;
1986
1987                 switch (function) {
1988                 case ISCSI_TM_FUNC_ABORT_TASK:
1989                         tcm_function = TMR_ABORT_TASK;
1990                         break;
1991                 case ISCSI_TM_FUNC_ABORT_TASK_SET:
1992                         tcm_function = TMR_ABORT_TASK_SET;
1993                         break;
1994                 case ISCSI_TM_FUNC_CLEAR_ACA:
1995                         tcm_function = TMR_CLEAR_ACA;
1996                         break;
1997                 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1998                         tcm_function = TMR_CLEAR_TASK_SET;
1999                         break;
2000                 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
2001                         tcm_function = TMR_LUN_RESET;
2002                         break;
2003                 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2004                         tcm_function = TMR_TARGET_WARM_RESET;
2005                         break;
2006                 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2007                         tcm_function = TMR_TARGET_COLD_RESET;
2008                         break;
2009                 default:
2010                         pr_err("Unknown iSCSI TMR Function:"
2011                                " 0x%02x\n", function);
2012                         return iscsit_add_reject_cmd(cmd,
2013                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2014                 }
2015
2016                 ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req,
2017                                          tcm_function, GFP_KERNEL);
2018                 if (ret < 0)
2019                         return iscsit_add_reject_cmd(cmd,
2020                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2021
2022                 cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
2023         }
2024
2025         cmd->iscsi_opcode       = ISCSI_OP_SCSI_TMFUNC;
2026         cmd->i_state            = ISTATE_SEND_TASKMGTRSP;
2027         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2028         cmd->init_task_tag      = hdr->itt;
2029         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2030         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2031         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2032         se_tmr                  = cmd->se_cmd.se_tmr_req;
2033         tmr_req                 = cmd->tmr_req;
2034         /*
2035          * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
2036          */
2037         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2038                 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
2039                                                scsilun_to_int(&hdr->lun));
2040                 if (ret < 0) {
2041                         se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
2042                         goto attach;
2043                 }
2044         }
2045
2046         switch (function) {
2047         case ISCSI_TM_FUNC_ABORT_TASK:
2048                 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
2049                 if (se_tmr->response)
2050                         goto attach;
2051                 break;
2052         case ISCSI_TM_FUNC_ABORT_TASK_SET:
2053         case ISCSI_TM_FUNC_CLEAR_ACA:
2054         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
2055         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
2056                 break;
2057         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2058                 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
2059                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2060                         goto attach;
2061                 }
2062                 break;
2063         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2064                 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
2065                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2066                         goto attach;
2067                 }
2068                 break;
2069         case ISCSI_TM_FUNC_TASK_REASSIGN:
2070                 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
2071                 /*
2072                  * Perform sanity checks on the ExpDataSN only if the
2073                  * TASK_REASSIGN was successful.
2074                  */
2075                 if (se_tmr->response)
2076                         break;
2077
2078                 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
2079                         return iscsit_add_reject_cmd(cmd,
2080                                         ISCSI_REASON_BOOKMARK_INVALID, buf);
2081                 break;
2082         default:
2083                 pr_err("Unknown TMR function: 0x%02x, protocol"
2084                         " error.\n", function);
2085                 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
2086                 goto attach;
2087         }
2088
2089         if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
2090             (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
2091                 se_tmr->call_transport = 1;
2092 attach:
2093         spin_lock_bh(&conn->cmd_lock);
2094         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2095         spin_unlock_bh(&conn->cmd_lock);
2096
2097         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2098                 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2099                 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
2100                         out_of_order_cmdsn = 1;
2101                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2102                         return 0;
2103                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2104                         return -1;
2105         }
2106         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2107
2108         if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
2109                 return 0;
2110         /*
2111          * Found the referenced task, send to transport for processing.
2112          */
2113         if (se_tmr->call_transport)
2114                 return transport_generic_handle_tmr(&cmd->se_cmd);
2115
2116         /*
2117          * Could not find the referenced LUN, task, or Task Management
2118          * command not authorized or supported.  Change state and
2119          * let the tx_thread send the response.
2120          *
2121          * For connection recovery, this is also the default action for
2122          * TMR TASK_REASSIGN.
2123          */
2124         if (sess_ref) {
2125                 pr_debug("Handle TMR, using sess_ref=true check\n");
2126                 target_put_sess_cmd(&cmd->se_cmd);
2127         }
2128
2129         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2130         return 0;
2131 }
2132 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
2133
2134 /* #warning FIXME: Support Text Command parameters besides SendTargets */
2135 int
2136 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2137                       struct iscsi_text *hdr)
2138 {
2139         u32 payload_length = ntoh24(hdr->dlength);
2140
2141         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
2142                 pr_err("Unable to accept text parameter length: %u"
2143                         "greater than MaxXmitDataSegmentLength %u.\n",
2144                        payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
2145                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2146                                          (unsigned char *)hdr);
2147         }
2148
2149         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
2150              (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
2151                 pr_err("Multi sequence text commands currently not supported\n");
2152                 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
2153                                         (unsigned char *)hdr);
2154         }
2155
2156         pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
2157                 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
2158                 hdr->exp_statsn, payload_length);
2159
2160         cmd->iscsi_opcode       = ISCSI_OP_TEXT;
2161         cmd->i_state            = ISTATE_SEND_TEXTRSP;
2162         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2163         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2164         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2165         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2166         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2167         cmd->data_direction     = DMA_NONE;
2168         cmd->text_in_ptr        = NULL;
2169
2170         return 0;
2171 }
2172 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2173
2174 int
2175 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2176                         struct iscsi_text *hdr)
2177 {
2178         unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2179         int cmdsn_ret;
2180
2181         if (!text_in) {
2182                 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2183                 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2184                         pr_err("Unable to locate text_in buffer for sendtargets"
2185                                " discovery\n");
2186                         goto reject;
2187                 }
2188                 goto empty_sendtargets;
2189         }
2190         if (strncmp("SendTargets", text_in, 11) != 0) {
2191                 pr_err("Received Text Data that is not"
2192                         " SendTargets, cannot continue.\n");
2193                 goto reject;
2194         }
2195         text_ptr = strchr(text_in, '=');
2196         if (!text_ptr) {
2197                 pr_err("No \"=\" separator found in Text Data,"
2198                         "  cannot continue.\n");
2199                 goto reject;
2200         }
2201         if (!strncmp("=All", text_ptr, 4)) {
2202                 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2203         } else if (!strncmp("=iqn.", text_ptr, 5) ||
2204                    !strncmp("=eui.", text_ptr, 5)) {
2205                 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2206         } else {
2207                 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2208                 goto reject;
2209         }
2210
2211         spin_lock_bh(&conn->cmd_lock);
2212         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2213         spin_unlock_bh(&conn->cmd_lock);
2214
2215 empty_sendtargets:
2216         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2217
2218         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2219                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2220                                 (unsigned char *)hdr, hdr->cmdsn);
2221                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2222                         return -1;
2223
2224                 return 0;
2225         }
2226
2227         return iscsit_execute_cmd(cmd, 0);
2228
2229 reject:
2230         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2231                                  (unsigned char *)hdr);
2232 }
2233 EXPORT_SYMBOL(iscsit_process_text_cmd);
2234
2235 static int
2236 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2237                        unsigned char *buf)
2238 {
2239         struct iscsi_text *hdr = (struct iscsi_text *)buf;
2240         char *text_in = NULL;
2241         u32 payload_length = ntoh24(hdr->dlength);
2242         int rx_size, rc;
2243
2244         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2245         if (rc < 0)
2246                 return 0;
2247
2248         rx_size = payload_length;
2249         if (payload_length) {
2250                 u32 checksum = 0, data_crc = 0;
2251                 u32 padding = 0, pad_bytes = 0;
2252                 int niov = 0, rx_got;
2253                 struct kvec iov[3];
2254
2255                 text_in = kzalloc(payload_length, GFP_KERNEL);
2256                 if (!text_in) {
2257                         pr_err("Unable to allocate memory for"
2258                                 " incoming text parameters\n");
2259                         goto reject;
2260                 }
2261                 cmd->text_in_ptr = text_in;
2262
2263                 memset(iov, 0, 3 * sizeof(struct kvec));
2264                 iov[niov].iov_base      = text_in;
2265                 iov[niov++].iov_len     = payload_length;
2266
2267                 padding = ((-payload_length) & 3);
2268                 if (padding != 0) {
2269                         iov[niov].iov_base = &pad_bytes;
2270                         iov[niov++].iov_len  = padding;
2271                         rx_size += padding;
2272                         pr_debug("Receiving %u additional bytes"
2273                                         " for padding.\n", padding);
2274                 }
2275                 if (conn->conn_ops->DataDigest) {
2276                         iov[niov].iov_base      = &checksum;
2277                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
2278                         rx_size += ISCSI_CRC_LEN;
2279                 }
2280
2281                 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2282                 if (rx_got != rx_size)
2283                         goto reject;
2284
2285                 if (conn->conn_ops->DataDigest) {
2286                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
2287                                         text_in, payload_length,
2288                                         padding, (u8 *)&pad_bytes,
2289                                         (u8 *)&data_crc);
2290
2291                         if (checksum != data_crc) {
2292                                 pr_err("Text data CRC32C DataDigest"
2293                                         " 0x%08x does not match computed"
2294                                         " 0x%08x\n", checksum, data_crc);
2295                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2296                                         pr_err("Unable to recover from"
2297                                         " Text Data digest failure while in"
2298                                                 " ERL=0.\n");
2299                                         goto reject;
2300                                 } else {
2301                                         /*
2302                                          * Silently drop this PDU and let the
2303                                          * initiator plug the CmdSN gap.
2304                                          */
2305                                         pr_debug("Dropping Text"
2306                                         " Command CmdSN: 0x%08x due to"
2307                                         " DataCRC error.\n", hdr->cmdsn);
2308                                         kfree(text_in);
2309                                         return 0;
2310                                 }
2311                         } else {
2312                                 pr_debug("Got CRC32C DataDigest"
2313                                         " 0x%08x for %u bytes of text data.\n",
2314                                                 checksum, payload_length);
2315                         }
2316                 }
2317                 text_in[payload_length - 1] = '\0';
2318                 pr_debug("Successfully read %d bytes of text"
2319                                 " data.\n", payload_length);
2320         }
2321
2322         return iscsit_process_text_cmd(conn, cmd, hdr);
2323
2324 reject:
2325         kfree(cmd->text_in_ptr);
2326         cmd->text_in_ptr = NULL;
2327         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2328 }
2329
2330 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2331 {
2332         struct iscsi_conn *conn_p;
2333         struct iscsi_session *sess = conn->sess;
2334
2335         pr_debug("Received logout request CLOSESESSION on CID: %hu"
2336                 " for SID: %u.\n", conn->cid, conn->sess->sid);
2337
2338         atomic_set(&sess->session_logout, 1);
2339         atomic_set(&conn->conn_logout_remove, 1);
2340         conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2341
2342         iscsit_inc_conn_usage_count(conn);
2343         iscsit_inc_session_usage_count(sess);
2344
2345         spin_lock_bh(&sess->conn_lock);
2346         list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2347                 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2348                         continue;
2349
2350                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2351                 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2352         }
2353         spin_unlock_bh(&sess->conn_lock);
2354
2355         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2356
2357         return 0;
2358 }
2359
2360 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2361 {
2362         struct iscsi_conn *l_conn;
2363         struct iscsi_session *sess = conn->sess;
2364
2365         pr_debug("Received logout request CLOSECONNECTION for CID:"
2366                 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2367
2368         /*
2369          * A Logout Request with a CLOSECONNECTION reason code for a CID
2370          * can arrive on a connection with a differing CID.
2371          */
2372         if (conn->cid == cmd->logout_cid) {
2373                 spin_lock_bh(&conn->state_lock);
2374                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2375                 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2376
2377                 atomic_set(&conn->conn_logout_remove, 1);
2378                 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2379                 iscsit_inc_conn_usage_count(conn);
2380
2381                 spin_unlock_bh(&conn->state_lock);
2382         } else {
2383                 /*
2384                  * Handle all different cid CLOSECONNECTION requests in
2385                  * iscsit_logout_post_handler_diffcid() as to give enough
2386                  * time for any non immediate command's CmdSN to be
2387                  * acknowledged on the connection in question.
2388                  *
2389                  * Here we simply make sure the CID is still around.
2390                  */
2391                 l_conn = iscsit_get_conn_from_cid(sess,
2392                                 cmd->logout_cid);
2393                 if (!l_conn) {
2394                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2395                         iscsit_add_cmd_to_response_queue(cmd, conn,
2396                                         cmd->i_state);
2397                         return 0;
2398                 }
2399
2400                 iscsit_dec_conn_usage_count(l_conn);
2401         }
2402
2403         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2404
2405         return 0;
2406 }
2407
2408 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2409 {
2410         struct iscsi_session *sess = conn->sess;
2411
2412         pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2413                 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2414
2415         if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2416                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2417                         " while ERL!=2.\n");
2418                 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2419                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2420                 return 0;
2421         }
2422
2423         if (conn->cid == cmd->logout_cid) {
2424                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2425                         " with CID: %hu on CID: %hu, implementation error.\n",
2426                                 cmd->logout_cid, conn->cid);
2427                 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2428                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2429                 return 0;
2430         }
2431
2432         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2433
2434         return 0;
2435 }
2436
2437 int
2438 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2439                         unsigned char *buf)
2440 {
2441         int cmdsn_ret, logout_remove = 0;
2442         u8 reason_code = 0;
2443         struct iscsi_logout *hdr;
2444         struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2445
2446         hdr                     = (struct iscsi_logout *) buf;
2447         reason_code             = (hdr->flags & 0x7f);
2448
2449         if (tiqn) {
2450                 spin_lock(&tiqn->logout_stats.lock);
2451                 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2452                         tiqn->logout_stats.normal_logouts++;
2453                 else
2454                         tiqn->logout_stats.abnormal_logouts++;
2455                 spin_unlock(&tiqn->logout_stats.lock);
2456         }
2457
2458         pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2459                 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2460                 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2461                 hdr->cid, conn->cid);
2462
2463         if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2464                 pr_err("Received logout request on connection that"
2465                         " is not in logged in state, ignoring request.\n");
2466                 iscsit_free_cmd(cmd, false);
2467                 return 0;
2468         }
2469
2470         cmd->iscsi_opcode       = ISCSI_OP_LOGOUT;
2471         cmd->i_state            = ISTATE_SEND_LOGOUTRSP;
2472         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2473         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2474         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2475         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2476         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2477         cmd->logout_cid         = be16_to_cpu(hdr->cid);
2478         cmd->logout_reason      = reason_code;
2479         cmd->data_direction     = DMA_NONE;
2480
2481         /*
2482          * We need to sleep in these cases (by returning 1) until the Logout
2483          * Response gets sent in the tx thread.
2484          */
2485         if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2486            ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2487             be16_to_cpu(hdr->cid) == conn->cid))
2488                 logout_remove = 1;
2489
2490         spin_lock_bh(&conn->cmd_lock);
2491         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2492         spin_unlock_bh(&conn->cmd_lock);
2493
2494         if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2495                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2496
2497         /*
2498          * Immediate commands are executed, well, immediately.
2499          * Non-Immediate Logout Commands are executed in CmdSN order.
2500          */
2501         if (cmd->immediate_cmd) {
2502                 int ret = iscsit_execute_cmd(cmd, 0);
2503
2504                 if (ret < 0)
2505                         return ret;
2506         } else {
2507                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2508                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2509                         logout_remove = 0;
2510                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2511                         return -1;
2512         }
2513
2514         return logout_remove;
2515 }
2516 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2517
2518 int iscsit_handle_snack(
2519         struct iscsi_conn *conn,
2520         unsigned char *buf)
2521 {
2522         struct iscsi_snack *hdr;
2523
2524         hdr                     = (struct iscsi_snack *) buf;
2525         hdr->flags              &= ~ISCSI_FLAG_CMD_FINAL;
2526
2527         pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2528                 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2529                 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2530                         hdr->begrun, hdr->runlength, conn->cid);
2531
2532         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2533                 pr_err("Initiator sent SNACK request while in"
2534                         " ErrorRecoveryLevel=0.\n");
2535                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2536                                          buf);
2537         }
2538         /*
2539          * SNACK_DATA and SNACK_R2T are both 0,  so check which function to
2540          * call from inside iscsi_send_recovery_datain_or_r2t().
2541          */
2542         switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2543         case 0:
2544                 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2545                         hdr->itt,
2546                         be32_to_cpu(hdr->ttt),
2547                         be32_to_cpu(hdr->begrun),
2548                         be32_to_cpu(hdr->runlength));
2549         case ISCSI_FLAG_SNACK_TYPE_STATUS:
2550                 return iscsit_handle_status_snack(conn, hdr->itt,
2551                         be32_to_cpu(hdr->ttt),
2552                         be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2553         case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2554                 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2555                         be32_to_cpu(hdr->begrun),
2556                         be32_to_cpu(hdr->runlength));
2557         case ISCSI_FLAG_SNACK_TYPE_RDATA:
2558                 /* FIXME: Support R-Data SNACK */
2559                 pr_err("R-Data SNACK Not Supported.\n");
2560                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2561                                          buf);
2562         default:
2563                 pr_err("Unknown SNACK type 0x%02x, protocol"
2564                         " error.\n", hdr->flags & 0x0f);
2565                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2566                                          buf);
2567         }
2568
2569         return 0;
2570 }
2571 EXPORT_SYMBOL(iscsit_handle_snack);
2572
2573 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2574 {
2575         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2576             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2577                 wait_for_completion_interruptible_timeout(
2578                                         &conn->rx_half_close_comp,
2579                                         ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2580         }
2581 }
2582
2583 static int iscsit_handle_immediate_data(
2584         struct iscsi_cmd *cmd,
2585         struct iscsi_scsi_req *hdr,
2586         u32 length)
2587 {
2588         int iov_ret, rx_got = 0, rx_size = 0;
2589         u32 checksum, iov_count = 0, padding = 0;
2590         struct iscsi_conn *conn = cmd->conn;
2591         struct kvec *iov;
2592
2593         iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2594         if (iov_ret < 0)
2595                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2596
2597         rx_size = length;
2598         iov_count = iov_ret;
2599         iov = &cmd->iov_data[0];
2600
2601         padding = ((-length) & 3);
2602         if (padding != 0) {
2603                 iov[iov_count].iov_base = cmd->pad_bytes;
2604                 iov[iov_count++].iov_len = padding;
2605                 rx_size += padding;
2606         }
2607
2608         if (conn->conn_ops->DataDigest) {
2609                 iov[iov_count].iov_base         = &checksum;
2610                 iov[iov_count++].iov_len        = ISCSI_CRC_LEN;
2611                 rx_size += ISCSI_CRC_LEN;
2612         }
2613
2614         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2615
2616         iscsit_unmap_iovec(cmd);
2617
2618         if (rx_got != rx_size) {
2619                 iscsit_rx_thread_wait_for_tcp(conn);
2620                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2621         }
2622
2623         if (conn->conn_ops->DataDigest) {
2624                 u32 data_crc;
2625
2626                 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
2627                                                     cmd->write_data_done, length, padding,
2628                                                     cmd->pad_bytes);
2629
2630                 if (checksum != data_crc) {
2631                         pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2632                                 " does not match computed 0x%08x\n", checksum,
2633                                 data_crc);
2634
2635                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2636                                 pr_err("Unable to recover from"
2637                                         " Immediate Data digest failure while"
2638                                         " in ERL=0.\n");
2639                                 iscsit_reject_cmd(cmd,
2640                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2641                                                 (unsigned char *)hdr);
2642                                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2643                         } else {
2644                                 iscsit_reject_cmd(cmd,
2645                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2646                                                 (unsigned char *)hdr);
2647                                 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2648                         }
2649                 } else {
2650                         pr_debug("Got CRC32C DataDigest 0x%08x for"
2651                                 " %u bytes of Immediate Data\n", checksum,
2652                                 length);
2653                 }
2654         }
2655
2656         cmd->write_data_done += length;
2657
2658         if (cmd->write_data_done == cmd->se_cmd.data_length) {
2659                 spin_lock_bh(&cmd->istate_lock);
2660                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2661                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2662                 spin_unlock_bh(&cmd->istate_lock);
2663         }
2664
2665         return IMMEDIATE_DATA_NORMAL_OPERATION;
2666 }
2667
2668 /*
2669  *      Called with sess->conn_lock held.
2670  */
2671 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2672         with active network interface */
2673 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2674 {
2675         struct iscsi_cmd *cmd;
2676         struct iscsi_conn *conn_p;
2677         bool found = false;
2678
2679         /*
2680          * Only send a Asynchronous Message on connections whos network
2681          * interface is still functional.
2682          */
2683         list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2684                 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2685                         iscsit_inc_conn_usage_count(conn_p);
2686                         found = true;
2687                         break;
2688                 }
2689         }
2690
2691         if (!found)
2692                 return;
2693
2694         cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2695         if (!cmd) {
2696                 iscsit_dec_conn_usage_count(conn_p);
2697                 return;
2698         }
2699
2700         cmd->logout_cid = conn->cid;
2701         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2702         cmd->i_state = ISTATE_SEND_ASYNCMSG;
2703
2704         spin_lock_bh(&conn_p->cmd_lock);
2705         list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2706         spin_unlock_bh(&conn_p->cmd_lock);
2707
2708         iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2709         iscsit_dec_conn_usage_count(conn_p);
2710 }
2711
2712 static int iscsit_send_conn_drop_async_message(
2713         struct iscsi_cmd *cmd,
2714         struct iscsi_conn *conn)
2715 {
2716         struct iscsi_async *hdr;
2717
2718         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2719
2720         hdr                     = (struct iscsi_async *) cmd->pdu;
2721         hdr->opcode             = ISCSI_OP_ASYNC_EVENT;
2722         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
2723         cmd->init_task_tag      = RESERVED_ITT;
2724         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2725         put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2726         cmd->stat_sn            = conn->stat_sn++;
2727         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2728         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2729         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2730         hdr->async_event        = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2731         hdr->param1             = cpu_to_be16(cmd->logout_cid);
2732         hdr->param2             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2733         hdr->param3             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2734
2735         pr_debug("Sending Connection Dropped Async Message StatSN:"
2736                 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2737                         cmd->logout_cid, conn->cid);
2738
2739         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2740 }
2741
2742 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2743 {
2744         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2745             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2746                 wait_for_completion_interruptible_timeout(
2747                                         &conn->tx_half_close_comp,
2748                                         ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2749         }
2750 }
2751
2752 void
2753 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2754                         struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2755                         bool set_statsn)
2756 {
2757         hdr->opcode             = ISCSI_OP_SCSI_DATA_IN;
2758         hdr->flags              = datain->flags;
2759         if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2760                 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2761                         hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2762                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2763                 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2764                         hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2765                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2766                 }
2767         }
2768         hton24(hdr->dlength, datain->length);
2769         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2770                 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2771                                 (struct scsi_lun *)&hdr->lun);
2772         else
2773                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2774
2775         hdr->itt                = cmd->init_task_tag;
2776
2777         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2778                 hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2779         else
2780                 hdr->ttt                = cpu_to_be32(0xFFFFFFFF);
2781         if (set_statsn)
2782                 hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2783         else
2784                 hdr->statsn             = cpu_to_be32(0xFFFFFFFF);
2785
2786         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2787         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2788         hdr->datasn             = cpu_to_be32(datain->data_sn);
2789         hdr->offset             = cpu_to_be32(datain->offset);
2790
2791         pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2792                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2793                 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2794                 ntohl(hdr->offset), datain->length, conn->cid);
2795 }
2796 EXPORT_SYMBOL(iscsit_build_datain_pdu);
2797
2798 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2799 {
2800         struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2801         struct iscsi_datain datain;
2802         struct iscsi_datain_req *dr;
2803         int eodr = 0, ret;
2804         bool set_statsn = false;
2805
2806         memset(&datain, 0, sizeof(struct iscsi_datain));
2807         dr = iscsit_get_datain_values(cmd, &datain);
2808         if (!dr) {
2809                 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2810                                 cmd->init_task_tag);
2811                 return -1;
2812         }
2813         /*
2814          * Be paranoid and double check the logic for now.
2815          */
2816         if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2817                 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2818                         " datain.length: %u exceeds cmd->data_length: %u\n",
2819                         cmd->init_task_tag, datain.offset, datain.length,
2820                         cmd->se_cmd.data_length);
2821                 return -1;
2822         }
2823
2824         atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2825         /*
2826          * Special case for successfully execution w/ both DATAIN
2827          * and Sense Data.
2828          */
2829         if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2830             (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2831                 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2832         else {
2833                 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2834                     (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2835                         iscsit_increment_maxcmdsn(cmd, conn->sess);
2836                         cmd->stat_sn = conn->stat_sn++;
2837                         set_statsn = true;
2838                 } else if (dr->dr_complete ==
2839                            DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2840                         set_statsn = true;
2841         }
2842
2843         iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2844
2845         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0);
2846         if (ret < 0)
2847                 return ret;
2848
2849         if (dr->dr_complete) {
2850                 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2851                                 2 : 1;
2852                 iscsit_free_datain_req(cmd, dr);
2853         }
2854
2855         return eodr;
2856 }
2857
2858 int
2859 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2860                         struct iscsi_logout_rsp *hdr)
2861 {
2862         struct iscsi_conn *logout_conn = NULL;
2863         struct iscsi_conn_recovery *cr = NULL;
2864         struct iscsi_session *sess = conn->sess;
2865         /*
2866          * The actual shutting down of Sessions and/or Connections
2867          * for CLOSESESSION and CLOSECONNECTION Logout Requests
2868          * is done in scsi_logout_post_handler().
2869          */
2870         switch (cmd->logout_reason) {
2871         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2872                 pr_debug("iSCSI session logout successful, setting"
2873                         " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2874                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2875                 break;
2876         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2877                 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2878                         break;
2879                 /*
2880                  * For CLOSECONNECTION logout requests carrying
2881                  * a matching logout CID -> local CID, the reference
2882                  * for the local CID will have been incremented in
2883                  * iscsi_logout_closeconnection().
2884                  *
2885                  * For CLOSECONNECTION logout requests carrying
2886                  * a different CID than the connection it arrived
2887                  * on, the connection responding to cmd->logout_cid
2888                  * is stopped in iscsit_logout_post_handler_diffcid().
2889                  */
2890
2891                 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2892                         " successful.\n", cmd->logout_cid, conn->cid);
2893                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2894                 break;
2895         case ISCSI_LOGOUT_REASON_RECOVERY:
2896                 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2897                     (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2898                         break;
2899                 /*
2900                  * If the connection is still active from our point of view
2901                  * force connection recovery to occur.
2902                  */
2903                 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2904                                 cmd->logout_cid);
2905                 if (logout_conn) {
2906                         iscsit_connection_reinstatement_rcfr(logout_conn);
2907                         iscsit_dec_conn_usage_count(logout_conn);
2908                 }
2909
2910                 cr = iscsit_get_inactive_connection_recovery_entry(
2911                                 conn->sess, cmd->logout_cid);
2912                 if (!cr) {
2913                         pr_err("Unable to locate CID: %hu for"
2914                         " REMOVECONNFORRECOVERY Logout Request.\n",
2915                                 cmd->logout_cid);
2916                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2917                         break;
2918                 }
2919
2920                 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2921
2922                 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2923                         " for recovery for CID: %hu on CID: %hu successful.\n",
2924                                 cmd->logout_cid, conn->cid);
2925                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2926                 break;
2927         default:
2928                 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2929                                 cmd->logout_reason);
2930                 return -1;
2931         }
2932
2933         hdr->opcode             = ISCSI_OP_LOGOUT_RSP;
2934         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2935         hdr->response           = cmd->logout_response;
2936         hdr->itt                = cmd->init_task_tag;
2937         cmd->stat_sn            = conn->stat_sn++;
2938         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2939
2940         iscsit_increment_maxcmdsn(cmd, conn->sess);
2941         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2942         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2943
2944         pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2945                 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2946                 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2947                 cmd->logout_cid, conn->cid);
2948
2949         return 0;
2950 }
2951 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2952
2953 static int
2954 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2955 {
2956         int rc;
2957
2958         rc = iscsit_build_logout_rsp(cmd, conn,
2959                         (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2960         if (rc < 0)
2961                 return rc;
2962
2963         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2964 }
2965
2966 void
2967 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2968                        struct iscsi_nopin *hdr, bool nopout_response)
2969 {
2970         hdr->opcode             = ISCSI_OP_NOOP_IN;
2971         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2972         hton24(hdr->dlength, cmd->buf_ptr_size);
2973         if (nopout_response)
2974                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2975         hdr->itt                = cmd->init_task_tag;
2976         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2977         cmd->stat_sn            = (nopout_response) ? conn->stat_sn++ :
2978                                   conn->stat_sn;
2979         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2980
2981         if (nopout_response)
2982                 iscsit_increment_maxcmdsn(cmd, conn->sess);
2983
2984         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2985         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2986
2987         pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2988                 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2989                 "Solicited" : "Unsolicited", cmd->init_task_tag,
2990                 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2991 }
2992 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2993
2994 /*
2995  *      Unsolicited NOPIN, either requesting a response or not.
2996  */
2997 static int iscsit_send_unsolicited_nopin(
2998         struct iscsi_cmd *cmd,
2999         struct iscsi_conn *conn,
3000         int want_response)
3001 {
3002         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3003         int ret;
3004
3005         iscsit_build_nopin_rsp(cmd, conn, hdr, false);
3006
3007         pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
3008                 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
3009
3010         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3011         if (ret < 0)
3012                 return ret;
3013
3014         spin_lock_bh(&cmd->istate_lock);
3015         cmd->i_state = want_response ?
3016                 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
3017         spin_unlock_bh(&cmd->istate_lock);
3018
3019         return 0;
3020 }
3021
3022 static int
3023 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3024 {
3025         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3026
3027         iscsit_build_nopin_rsp(cmd, conn, hdr, true);
3028
3029         /*
3030          * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
3031          * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
3032          */
3033         pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size);
3034
3035         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3036                                                      cmd->buf_ptr,
3037                                                      cmd->buf_ptr_size);
3038 }
3039
3040 static int iscsit_send_r2t(
3041         struct iscsi_cmd *cmd,
3042         struct iscsi_conn *conn)
3043 {
3044         struct iscsi_r2t *r2t;
3045         struct iscsi_r2t_rsp *hdr;
3046         int ret;
3047
3048         r2t = iscsit_get_r2t_from_list(cmd);
3049         if (!r2t)
3050                 return -1;
3051
3052         hdr                     = (struct iscsi_r2t_rsp *) cmd->pdu;
3053         memset(hdr, 0, ISCSI_HDR_LEN);
3054         hdr->opcode             = ISCSI_OP_R2T;
3055         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3056         int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3057                         (struct scsi_lun *)&hdr->lun);
3058         hdr->itt                = cmd->init_task_tag;
3059         if (conn->conn_transport->iscsit_get_r2t_ttt)
3060                 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t);
3061         else
3062                 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
3063         hdr->ttt                = cpu_to_be32(r2t->targ_xfer_tag);
3064         hdr->statsn             = cpu_to_be32(conn->stat_sn);
3065         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3066         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3067         hdr->r2tsn              = cpu_to_be32(r2t->r2t_sn);
3068         hdr->data_offset        = cpu_to_be32(r2t->offset);
3069         hdr->data_length        = cpu_to_be32(r2t->xfer_len);
3070
3071         pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3072                 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3073                 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3074                 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3075                         r2t->offset, r2t->xfer_len, conn->cid);
3076
3077         spin_lock_bh(&cmd->r2t_lock);
3078         r2t->sent_r2t = 1;
3079         spin_unlock_bh(&cmd->r2t_lock);
3080
3081         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3082         if (ret < 0) {
3083                 return ret;
3084         }
3085
3086         spin_lock_bh(&cmd->dataout_timeout_lock);
3087         iscsit_start_dataout_timer(cmd, conn);
3088         spin_unlock_bh(&cmd->dataout_timeout_lock);
3089
3090         return 0;
3091 }
3092
3093 /*
3094  *      @recovery: If called from iscsi_task_reassign_complete_write() for
3095  *              connection recovery.
3096  */
3097 int iscsit_build_r2ts_for_cmd(
3098         struct iscsi_conn *conn,
3099         struct iscsi_cmd *cmd,
3100         bool recovery)
3101 {
3102         int first_r2t = 1;
3103         u32 offset = 0, xfer_len = 0;
3104
3105         spin_lock_bh(&cmd->r2t_lock);
3106         if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3107                 spin_unlock_bh(&cmd->r2t_lock);
3108                 return 0;
3109         }
3110
3111         if (conn->sess->sess_ops->DataSequenceInOrder &&
3112             !recovery)
3113                 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3114
3115         while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3116                 if (conn->sess->sess_ops->DataSequenceInOrder) {
3117                         offset = cmd->r2t_offset;
3118
3119                         if (first_r2t && recovery) {
3120                                 int new_data_end = offset +
3121                                         conn->sess->sess_ops->MaxBurstLength -
3122                                         cmd->next_burst_len;
3123
3124                                 if (new_data_end > cmd->se_cmd.data_length)
3125                                         xfer_len = cmd->se_cmd.data_length - offset;
3126                                 else
3127                                         xfer_len =
3128                                                 conn->sess->sess_ops->MaxBurstLength -
3129                                                 cmd->next_burst_len;
3130                         } else {
3131                                 int new_data_end = offset +
3132                                         conn->sess->sess_ops->MaxBurstLength;
3133
3134                                 if (new_data_end > cmd->se_cmd.data_length)
3135                                         xfer_len = cmd->se_cmd.data_length - offset;
3136                                 else
3137                                         xfer_len = conn->sess->sess_ops->MaxBurstLength;
3138                         }
3139                         cmd->r2t_offset += xfer_len;
3140
3141                         if (cmd->r2t_offset == cmd->se_cmd.data_length)
3142                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3143                 } else {
3144                         struct iscsi_seq *seq;
3145
3146                         seq = iscsit_get_seq_holder_for_r2t(cmd);
3147                         if (!seq) {
3148                                 spin_unlock_bh(&cmd->r2t_lock);
3149                                 return -1;
3150                         }
3151
3152                         offset = seq->offset;
3153                         xfer_len = seq->xfer_len;
3154
3155                         if (cmd->seq_send_order == cmd->seq_count)
3156                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3157                 }
3158                 cmd->outstanding_r2ts++;
3159                 first_r2t = 0;
3160
3161                 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3162                         spin_unlock_bh(&cmd->r2t_lock);
3163                         return -1;
3164                 }
3165
3166                 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3167                         break;
3168         }
3169         spin_unlock_bh(&cmd->r2t_lock);
3170
3171         return 0;
3172 }
3173 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd);
3174
3175 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3176                         bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3177 {
3178         if (inc_stat_sn)
3179                 cmd->stat_sn = conn->stat_sn++;
3180
3181         atomic_long_inc(&conn->sess->rsp_pdus);
3182
3183         memset(hdr, 0, ISCSI_HDR_LEN);
3184         hdr->opcode             = ISCSI_OP_SCSI_CMD_RSP;
3185         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3186         if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3187                 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3188                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3189         } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3190                 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3191                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3192         }
3193         hdr->response           = cmd->iscsi_response;
3194         hdr->cmd_status         = cmd->se_cmd.scsi_status;
3195         hdr->itt                = cmd->init_task_tag;
3196         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3197
3198         iscsit_increment_maxcmdsn(cmd, conn->sess);
3199         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3200         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3201
3202         pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3203                 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3204                 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3205                 cmd->se_cmd.scsi_status, conn->cid);
3206 }
3207 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3208
3209 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3210 {
3211         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3212         bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3213         void *data_buf = NULL;
3214         u32 padding = 0, data_buf_len = 0;
3215
3216         iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3217
3218         /*
3219          * Attach SENSE DATA payload to iSCSI Response PDU
3220          */
3221         if (cmd->se_cmd.sense_buffer &&
3222            ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3223             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3224                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3225                 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3226
3227                 padding         = -(cmd->se_cmd.scsi_sense_length) & 3;
3228                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3229                 data_buf = cmd->sense_buffer;
3230                 data_buf_len = cmd->se_cmd.scsi_sense_length + padding;
3231
3232                 if (padding) {
3233                         memset(cmd->sense_buffer +
3234                                 cmd->se_cmd.scsi_sense_length, 0, padding);
3235                         pr_debug("Adding %u bytes of padding to"
3236                                 " SENSE.\n", padding);
3237                 }
3238
3239                 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3240                                 " Response PDU\n",
3241                                 cmd->se_cmd.scsi_sense_length);
3242         }
3243
3244         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf,
3245                                                      data_buf_len);
3246 }
3247
3248 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3249 {
3250         switch (se_tmr->response) {
3251         case TMR_FUNCTION_COMPLETE:
3252                 return ISCSI_TMF_RSP_COMPLETE;
3253         case TMR_TASK_DOES_NOT_EXIST:
3254                 return ISCSI_TMF_RSP_NO_TASK;
3255         case TMR_LUN_DOES_NOT_EXIST:
3256                 return ISCSI_TMF_RSP_NO_LUN;
3257         case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3258                 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3259         case TMR_FUNCTION_REJECTED:
3260         default:
3261                 return ISCSI_TMF_RSP_REJECTED;
3262         }
3263 }
3264
3265 void
3266 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3267                           struct iscsi_tm_rsp *hdr)
3268 {
3269         struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3270
3271         hdr->opcode             = ISCSI_OP_SCSI_TMFUNC_RSP;
3272         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
3273         hdr->response           = iscsit_convert_tcm_tmr_rsp(se_tmr);
3274         hdr->itt                = cmd->init_task_tag;
3275         cmd->stat_sn            = conn->stat_sn++;
3276         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3277
3278         iscsit_increment_maxcmdsn(cmd, conn->sess);
3279         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3280         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3281
3282         pr_debug("Built Task Management Response ITT: 0x%08x,"
3283                 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3284                 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3285 }
3286 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3287
3288 static int
3289 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3290 {
3291         struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3292
3293         iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3294
3295         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3296 }
3297
3298 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3299 {
3300         bool ret = false;
3301
3302         if (np->np_sockaddr.ss_family == AF_INET6) {
3303                 const struct sockaddr_in6 sin6 = {
3304                         .sin6_addr = IN6ADDR_ANY_INIT };
3305                 struct sockaddr_in6 *sock_in6 =
3306                          (struct sockaddr_in6 *)&np->np_sockaddr;
3307
3308                 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3309                                 sin6.sin6_addr.s6_addr, 16))
3310                         ret = true;
3311         } else {
3312                 struct sockaddr_in * sock_in =
3313                         (struct sockaddr_in *)&np->np_sockaddr;
3314
3315                 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
3316                         ret = true;
3317         }
3318
3319         return ret;
3320 }
3321
3322 #define SENDTARGETS_BUF_LIMIT 32768U
3323
3324 static int
3325 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
3326                                   enum iscsit_transport_type network_transport,
3327                                   int skip_bytes, bool *completed)
3328 {
3329         char *payload = NULL;
3330         struct iscsi_conn *conn = cmd->conn;
3331         struct iscsi_portal_group *tpg;
3332         struct iscsi_tiqn *tiqn;
3333         struct iscsi_tpg_np *tpg_np;
3334         int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3335         int target_name_printed;
3336         unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3337         unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3338         bool active;
3339
3340         buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3341                          SENDTARGETS_BUF_LIMIT);
3342
3343         payload = kzalloc(buffer_len, GFP_KERNEL);
3344         if (!payload) {
3345                 pr_err("Unable to allocate memory for sendtargets"
3346                                 " response.\n");
3347                 return -ENOMEM;
3348         }
3349         /*
3350          * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3351          * explicit case..
3352          */
3353         if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3354                 text_ptr = strchr(text_in, '=');
3355                 if (!text_ptr) {
3356                         pr_err("Unable to locate '=' string in text_in:"
3357                                " %s\n", text_in);
3358                         kfree(payload);
3359                         return -EINVAL;
3360                 }
3361                 /*
3362                  * Skip over '=' character..
3363                  */
3364                 text_ptr += 1;
3365         }
3366
3367         spin_lock(&tiqn_lock);
3368         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3369                 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3370                      strcmp(tiqn->tiqn, text_ptr)) {
3371                         continue;
3372                 }
3373
3374                 target_name_printed = 0;
3375
3376                 spin_lock(&tiqn->tiqn_tpg_lock);
3377                 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3378
3379                         /* If demo_mode_discovery=0 and generate_node_acls=0
3380                          * (demo mode dislabed) do not return
3381                          * TargetName+TargetAddress unless a NodeACL exists.
3382                          */
3383
3384                         if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3385                             (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3386                             (!target_tpg_has_node_acl(&tpg->tpg_se_tpg,
3387                                 cmd->conn->sess->sess_ops->InitiatorName))) {
3388                                 continue;
3389                         }
3390
3391                         spin_lock(&tpg->tpg_state_lock);
3392                         active = (tpg->tpg_state == TPG_STATE_ACTIVE);
3393                         spin_unlock(&tpg->tpg_state_lock);
3394
3395                         if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets)
3396                                 continue;
3397
3398                         spin_lock(&tpg->tpg_np_lock);
3399                         list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3400                                                 tpg_np_list) {
3401                                 struct iscsi_np *np = tpg_np->tpg_np;
3402                                 bool inaddr_any = iscsit_check_inaddr_any(np);
3403                                 struct sockaddr_storage *sockaddr;
3404
3405                                 if (np->np_network_transport != network_transport)
3406                                         continue;
3407
3408                                 if (!target_name_printed) {
3409                                         len = sprintf(buf, "TargetName=%s",
3410                                                       tiqn->tiqn);
3411                                         len += 1;
3412
3413                                         if ((len + payload_len) > buffer_len) {
3414                                                 spin_unlock(&tpg->tpg_np_lock);
3415                                                 spin_unlock(&tiqn->tiqn_tpg_lock);
3416                                                 end_of_buf = 1;
3417                                                 goto eob;
3418                                         }
3419
3420                                         if (skip_bytes && len <= skip_bytes) {
3421                                                 skip_bytes -= len;
3422                                         } else {
3423                                                 memcpy(payload + payload_len, buf, len);
3424                                                 payload_len += len;
3425                                                 target_name_printed = 1;
3426                                                 if (len > skip_bytes)
3427                                                         skip_bytes = 0;
3428                                         }
3429                                 }
3430
3431                                 if (inaddr_any)
3432                                         sockaddr = &conn->local_sockaddr;
3433                                 else
3434                                         sockaddr = &np->np_sockaddr;
3435
3436                                 len = sprintf(buf, "TargetAddress="
3437                                               "%pISpc,%hu",
3438                                               sockaddr,
3439                                               tpg->tpgt);
3440                                 len += 1;
3441
3442                                 if ((len + payload_len) > buffer_len) {
3443                                         spin_unlock(&tpg->tpg_np_lock);
3444                                         spin_unlock(&tiqn->tiqn_tpg_lock);
3445                                         end_of_buf = 1;
3446                                         goto eob;
3447                                 }
3448
3449                                 if (skip_bytes && len <= skip_bytes) {
3450                                         skip_bytes -= len;
3451                                 } else {
3452                                         memcpy(payload + payload_len, buf, len);
3453                                         payload_len += len;
3454                                         if (len > skip_bytes)
3455                                                 skip_bytes = 0;
3456                                 }
3457                         }
3458                         spin_unlock(&tpg->tpg_np_lock);
3459                 }
3460                 spin_unlock(&tiqn->tiqn_tpg_lock);
3461 eob:
3462                 if (end_of_buf) {
3463                         *completed = false;
3464                         break;
3465                 }
3466
3467                 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3468                         break;
3469         }
3470         spin_unlock(&tiqn_lock);
3471
3472         cmd->buf_ptr = payload;
3473
3474         return payload_len;
3475 }
3476
3477 int
3478 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3479                       struct iscsi_text_rsp *hdr,
3480                       enum iscsit_transport_type network_transport)
3481 {
3482         int text_length, padding;
3483         bool completed = true;
3484
3485         text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3486                                                         cmd->read_data_done,
3487                                                         &completed);
3488         if (text_length < 0)
3489                 return text_length;
3490
3491         if (completed) {
3492                 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3493         } else {
3494                 hdr->flags |= ISCSI_FLAG_TEXT_CONTINUE;
3495                 cmd->read_data_done += text_length;
3496                 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3497                         cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3498         }
3499         hdr->opcode = ISCSI_OP_TEXT_RSP;
3500         padding = ((-text_length) & 3);
3501         hton24(hdr->dlength, text_length);
3502         hdr->itt = cmd->init_task_tag;
3503         hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3504         cmd->stat_sn = conn->stat_sn++;
3505         hdr->statsn = cpu_to_be32(cmd->stat_sn);
3506
3507         iscsit_increment_maxcmdsn(cmd, conn->sess);
3508         /*
3509          * Reset maxcmdsn_inc in multi-part text payload exchanges to
3510          * correctly increment MaxCmdSN for each response answering a
3511          * non immediate text request with a valid CmdSN.
3512          */
3513         cmd->maxcmdsn_inc = 0;
3514         hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3515         hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3516
3517         pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3518                 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3519                 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3520                 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3521                 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3522
3523         return text_length + padding;
3524 }
3525 EXPORT_SYMBOL(iscsit_build_text_rsp);
3526
3527 static int iscsit_send_text_rsp(
3528         struct iscsi_cmd *cmd,
3529         struct iscsi_conn *conn)
3530 {
3531         struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3532         int text_length;
3533
3534         text_length = iscsit_build_text_rsp(cmd, conn, hdr,
3535                                 conn->conn_transport->transport_type);
3536         if (text_length < 0)
3537                 return text_length;
3538
3539         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3540                                                      cmd->buf_ptr,
3541                                                      text_length);
3542 }
3543
3544 void
3545 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3546                     struct iscsi_reject *hdr)
3547 {
3548         hdr->opcode             = ISCSI_OP_REJECT;
3549         hdr->reason             = cmd->reject_reason;
3550         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3551         hton24(hdr->dlength, ISCSI_HDR_LEN);
3552         hdr->ffffffff           = cpu_to_be32(0xffffffff);
3553         cmd->stat_sn            = conn->stat_sn++;
3554         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3555         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3556         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3557
3558 }
3559 EXPORT_SYMBOL(iscsit_build_reject);
3560
3561 static int iscsit_send_reject(
3562         struct iscsi_cmd *cmd,
3563         struct iscsi_conn *conn)
3564 {
3565         struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3566
3567         iscsit_build_reject(cmd, conn, hdr);
3568
3569         pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3570                 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3571
3572         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3573                                                      cmd->buf_ptr,
3574                                                      ISCSI_HDR_LEN);
3575 }
3576
3577 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3578 {
3579         int ord, cpu;
3580         /*
3581          * bitmap_id is assigned from iscsit_global->ts_bitmap from
3582          * within iscsit_start_kthreads()
3583          *
3584          * Here we use bitmap_id to determine which CPU that this
3585          * iSCSI connection's RX/TX threads will be scheduled to
3586          * execute upon.
3587          */
3588         ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3589         for_each_online_cpu(cpu) {
3590                 if (ord-- == 0) {
3591                         cpumask_set_cpu(cpu, conn->conn_cpumask);
3592                         return;
3593                 }
3594         }
3595         /*
3596          * This should never be reached..
3597          */
3598         dump_stack();
3599         cpumask_setall(conn->conn_cpumask);
3600 }
3601
3602 int
3603 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3604 {
3605         int ret;
3606
3607         switch (state) {
3608         case ISTATE_SEND_R2T:
3609                 ret = iscsit_send_r2t(cmd, conn);
3610                 if (ret < 0)
3611                         goto err;
3612                 break;
3613         case ISTATE_REMOVE:
3614                 spin_lock_bh(&conn->cmd_lock);
3615                 list_del_init(&cmd->i_conn_node);
3616                 spin_unlock_bh(&conn->cmd_lock);
3617
3618                 iscsit_free_cmd(cmd, false);
3619                 break;
3620         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3621                 iscsit_mod_nopin_response_timer(conn);
3622                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3623                 if (ret < 0)
3624                         goto err;
3625                 break;
3626         case ISTATE_SEND_NOPIN_NO_RESPONSE:
3627                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3628                 if (ret < 0)
3629                         goto err;
3630                 break;
3631         default:
3632                 pr_err("Unknown Opcode: 0x%02x ITT:"
3633                        " 0x%08x, i_state: %d on CID: %hu\n",
3634                        cmd->iscsi_opcode, cmd->init_task_tag, state,
3635                        conn->cid);
3636                 goto err;
3637         }
3638
3639         return 0;
3640
3641 err:
3642         return -1;
3643 }
3644 EXPORT_SYMBOL(iscsit_immediate_queue);
3645
3646 static int
3647 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3648 {
3649         struct iscsit_transport *t = conn->conn_transport;
3650         struct iscsi_queue_req *qr;
3651         struct iscsi_cmd *cmd;
3652         u8 state;
3653         int ret;
3654
3655         while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3656                 atomic_set(&conn->check_immediate_queue, 0);
3657                 cmd = qr->cmd;
3658                 state = qr->state;
3659                 kmem_cache_free(lio_qr_cache, qr);
3660
3661                 ret = t->iscsit_immediate_queue(conn, cmd, state);
3662                 if (ret < 0)
3663                         return ret;
3664         }
3665
3666         return 0;
3667 }
3668
3669 int
3670 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3671 {
3672         int ret;
3673
3674 check_rsp_state:
3675         switch (state) {
3676         case ISTATE_SEND_DATAIN:
3677                 ret = iscsit_send_datain(cmd, conn);
3678                 if (ret < 0)
3679                         goto err;
3680                 else if (!ret)
3681                         /* more drs */
3682                         goto check_rsp_state;
3683                 else if (ret == 1) {
3684                         /* all done */
3685                         spin_lock_bh(&cmd->istate_lock);
3686                         cmd->i_state = ISTATE_SENT_STATUS;
3687                         spin_unlock_bh(&cmd->istate_lock);
3688
3689                         if (atomic_read(&conn->check_immediate_queue))
3690                                 return 1;
3691
3692                         return 0;
3693                 } else if (ret == 2) {
3694                         /* Still must send status,
3695                            SCF_TRANSPORT_TASK_SENSE was set */
3696                         spin_lock_bh(&cmd->istate_lock);
3697                         cmd->i_state = ISTATE_SEND_STATUS;
3698                         spin_unlock_bh(&cmd->istate_lock);
3699                         state = ISTATE_SEND_STATUS;
3700                         goto check_rsp_state;
3701                 }
3702
3703                 break;
3704         case ISTATE_SEND_STATUS:
3705         case ISTATE_SEND_STATUS_RECOVERY:
3706                 ret = iscsit_send_response(cmd, conn);
3707                 break;
3708         case ISTATE_SEND_LOGOUTRSP:
3709                 ret = iscsit_send_logout(cmd, conn);
3710                 break;
3711         case ISTATE_SEND_ASYNCMSG:
3712                 ret = iscsit_send_conn_drop_async_message(
3713                         cmd, conn);
3714                 break;
3715         case ISTATE_SEND_NOPIN:
3716                 ret = iscsit_send_nopin(cmd, conn);
3717                 break;
3718         case ISTATE_SEND_REJECT:
3719                 ret = iscsit_send_reject(cmd, conn);
3720                 break;
3721         case ISTATE_SEND_TASKMGTRSP:
3722                 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3723                 if (ret != 0)
3724                         break;
3725                 ret = iscsit_tmr_post_handler(cmd, conn);
3726                 if (ret != 0)
3727                         iscsit_fall_back_to_erl0(conn->sess);
3728                 break;
3729         case ISTATE_SEND_TEXTRSP:
3730                 ret = iscsit_send_text_rsp(cmd, conn);
3731                 break;
3732         default:
3733                 pr_err("Unknown Opcode: 0x%02x ITT:"
3734                        " 0x%08x, i_state: %d on CID: %hu\n",
3735                        cmd->iscsi_opcode, cmd->init_task_tag,
3736                        state, conn->cid);
3737                 goto err;
3738         }
3739         if (ret < 0)
3740                 goto err;
3741
3742         switch (state) {
3743         case ISTATE_SEND_LOGOUTRSP:
3744                 if (!iscsit_logout_post_handler(cmd, conn))
3745                         return -ECONNRESET;
3746                 /* fall through */
3747         case ISTATE_SEND_STATUS:
3748         case ISTATE_SEND_ASYNCMSG:
3749         case ISTATE_SEND_NOPIN:
3750         case ISTATE_SEND_STATUS_RECOVERY:
3751         case ISTATE_SEND_TEXTRSP:
3752         case ISTATE_SEND_TASKMGTRSP:
3753         case ISTATE_SEND_REJECT:
3754                 spin_lock_bh(&cmd->istate_lock);
3755                 cmd->i_state = ISTATE_SENT_STATUS;
3756                 spin_unlock_bh(&cmd->istate_lock);
3757                 break;
3758         default:
3759                 pr_err("Unknown Opcode: 0x%02x ITT:"
3760                        " 0x%08x, i_state: %d on CID: %hu\n",
3761                        cmd->iscsi_opcode, cmd->init_task_tag,
3762                        cmd->i_state, conn->cid);
3763                 goto err;
3764         }
3765
3766         if (atomic_read(&conn->check_immediate_queue))
3767                 return 1;
3768
3769         return 0;
3770
3771 err:
3772         return -1;
3773 }
3774 EXPORT_SYMBOL(iscsit_response_queue);
3775
3776 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3777 {
3778         struct iscsit_transport *t = conn->conn_transport;
3779         struct iscsi_queue_req *qr;
3780         struct iscsi_cmd *cmd;
3781         u8 state;
3782         int ret;
3783
3784         while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3785                 cmd = qr->cmd;
3786                 state = qr->state;
3787                 kmem_cache_free(lio_qr_cache, qr);
3788
3789                 ret = t->iscsit_response_queue(conn, cmd, state);
3790                 if (ret == 1 || ret < 0)
3791                         return ret;
3792         }
3793
3794         return 0;
3795 }
3796
3797 int iscsi_target_tx_thread(void *arg)
3798 {
3799         int ret = 0;
3800         struct iscsi_conn *conn = arg;
3801         /*
3802          * Allow ourselves to be interrupted by SIGINT so that a
3803          * connection recovery / failure event can be triggered externally.
3804          */
3805         allow_signal(SIGINT);
3806
3807         while (!kthread_should_stop()) {
3808                 /*
3809                  * Ensure that both TX and RX per connection kthreads
3810                  * are scheduled to run on the same CPU.
3811                  */
3812                 iscsit_thread_check_cpumask(conn, current, 1);
3813
3814                 wait_event_interruptible(conn->queues_wq,
3815                                          !iscsit_conn_all_queues_empty(conn));
3816
3817                 if (signal_pending(current))
3818                         goto transport_err;
3819
3820 get_immediate:
3821                 ret = iscsit_handle_immediate_queue(conn);
3822                 if (ret < 0)
3823                         goto transport_err;
3824
3825                 ret = iscsit_handle_response_queue(conn);
3826                 if (ret == 1)
3827                         goto get_immediate;
3828                 else if (ret == -ECONNRESET)
3829                         goto out;
3830                 else if (ret < 0)
3831                         goto transport_err;
3832         }
3833
3834 transport_err:
3835         /*
3836          * Avoid the normal connection failure code-path if this connection
3837          * is still within LOGIN mode, and iscsi_np process context is
3838          * responsible for cleaning up the early connection failure.
3839          */
3840         if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
3841                 iscsit_take_action_for_connection_exit(conn);
3842 out:
3843         return 0;
3844 }
3845
3846 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3847 {
3848         struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3849         struct iscsi_cmd *cmd;
3850         int ret = 0;
3851
3852         switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3853         case ISCSI_OP_SCSI_CMD:
3854                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3855                 if (!cmd)
3856                         goto reject;
3857
3858                 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3859                 break;
3860         case ISCSI_OP_SCSI_DATA_OUT:
3861                 ret = iscsit_handle_data_out(conn, buf);
3862                 break;
3863         case ISCSI_OP_NOOP_OUT:
3864                 cmd = NULL;
3865                 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3866                         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3867                         if (!cmd)
3868                                 goto reject;
3869                 }
3870                 ret = iscsit_handle_nop_out(conn, cmd, buf);
3871                 break;
3872         case ISCSI_OP_SCSI_TMFUNC:
3873                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3874                 if (!cmd)
3875                         goto reject;
3876
3877                 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3878                 break;
3879         case ISCSI_OP_TEXT:
3880                 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
3881                         cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
3882                         if (!cmd)
3883                                 goto reject;
3884                 } else {
3885                         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3886                         if (!cmd)
3887                                 goto reject;
3888                 }
3889
3890                 ret = iscsit_handle_text_cmd(conn, cmd, buf);
3891                 break;
3892         case ISCSI_OP_LOGOUT:
3893                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3894                 if (!cmd)
3895                         goto reject;
3896
3897                 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3898                 if (ret > 0)
3899                         wait_for_completion_timeout(&conn->conn_logout_comp,
3900                                         SECONDS_FOR_LOGOUT_COMP * HZ);
3901                 break;
3902         case ISCSI_OP_SNACK:
3903                 ret = iscsit_handle_snack(conn, buf);
3904                 break;
3905         default:
3906                 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
3907                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3908                         pr_err("Cannot recover from unknown"
3909                         " opcode while ERL=0, closing iSCSI connection.\n");
3910                         return -1;
3911                 }
3912                 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
3913                        " closing iSCSI connection.\n");
3914                 ret = -1;
3915                 break;
3916         }
3917
3918         return ret;
3919 reject:
3920         return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3921 }
3922
3923 static bool iscsi_target_check_conn_state(struct iscsi_conn *conn)
3924 {
3925         bool ret;
3926
3927         spin_lock_bh(&conn->state_lock);
3928         ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN);
3929         spin_unlock_bh(&conn->state_lock);
3930
3931         return ret;
3932 }
3933
3934 static void iscsit_get_rx_pdu(struct iscsi_conn *conn)
3935 {
3936         int ret;
3937         u8 buffer[ISCSI_HDR_LEN], opcode;
3938         u32 checksum = 0, digest = 0;
3939         struct kvec iov;
3940
3941         while (!kthread_should_stop()) {
3942                 /*
3943                  * Ensure that both TX and RX per connection kthreads
3944                  * are scheduled to run on the same CPU.
3945                  */
3946                 iscsit_thread_check_cpumask(conn, current, 0);
3947
3948                 memset(buffer, 0, ISCSI_HDR_LEN);
3949                 memset(&iov, 0, sizeof(struct kvec));
3950
3951                 iov.iov_base    = buffer;
3952                 iov.iov_len     = ISCSI_HDR_LEN;
3953
3954                 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3955                 if (ret != ISCSI_HDR_LEN) {
3956                         iscsit_rx_thread_wait_for_tcp(conn);
3957                         return;
3958                 }
3959
3960                 if (conn->conn_ops->HeaderDigest) {
3961                         iov.iov_base    = &digest;
3962                         iov.iov_len     = ISCSI_CRC_LEN;
3963
3964                         ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3965                         if (ret != ISCSI_CRC_LEN) {
3966                                 iscsit_rx_thread_wait_for_tcp(conn);
3967                                 return;
3968                         }
3969
3970                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
3971                                         buffer, ISCSI_HDR_LEN,
3972                                         0, NULL, (u8 *)&checksum);
3973
3974                         if (digest != checksum) {
3975                                 pr_err("HeaderDigest CRC32C failed,"
3976                                         " received 0x%08x, computed 0x%08x\n",
3977                                         digest, checksum);
3978                                 /*
3979                                  * Set the PDU to 0xff so it will intentionally
3980                                  * hit default in the switch below.
3981                                  */
3982                                 memset(buffer, 0xff, ISCSI_HDR_LEN);
3983                                 atomic_long_inc(&conn->sess->conn_digest_errors);
3984                         } else {
3985                                 pr_debug("Got HeaderDigest CRC32C"
3986                                                 " 0x%08x\n", checksum);
3987                         }
3988                 }
3989
3990                 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
3991                         return;
3992
3993                 opcode = buffer[0] & ISCSI_OPCODE_MASK;
3994
3995                 if (conn->sess->sess_ops->SessionType &&
3996                    ((!(opcode & ISCSI_OP_TEXT)) ||
3997                     (!(opcode & ISCSI_OP_LOGOUT)))) {
3998                         pr_err("Received illegal iSCSI Opcode: 0x%02x"
3999                         " while in Discovery Session, rejecting.\n", opcode);
4000                         iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4001                                           buffer);
4002                         return;
4003                 }
4004
4005                 ret = iscsi_target_rx_opcode(conn, buffer);
4006                 if (ret < 0)
4007                         return;
4008         }
4009 }
4010
4011 int iscsi_target_rx_thread(void *arg)
4012 {
4013         int rc;
4014         struct iscsi_conn *conn = arg;
4015
4016         /*
4017          * Allow ourselves to be interrupted by SIGINT so that a
4018          * connection recovery / failure event can be triggered externally.
4019          */
4020         allow_signal(SIGINT);
4021         /*
4022          * Wait for iscsi_post_login_handler() to complete before allowing
4023          * incoming iscsi/tcp socket I/O, and/or failing the connection.
4024          */
4025         rc = wait_for_completion_interruptible(&conn->rx_login_comp);
4026         if (rc < 0 || iscsi_target_check_conn_state(conn))
4027                 return 0;
4028
4029         if (!conn->conn_transport->iscsit_get_rx_pdu)
4030                 return 0;
4031
4032         conn->conn_transport->iscsit_get_rx_pdu(conn);
4033
4034         if (!signal_pending(current))
4035                 atomic_set(&conn->transport_failed, 1);
4036         iscsit_take_action_for_connection_exit(conn);
4037         return 0;
4038 }
4039
4040 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4041 {
4042         LIST_HEAD(tmp_list);
4043         struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4044         struct iscsi_session *sess = conn->sess;
4045         /*
4046          * We expect this function to only ever be called from either RX or TX
4047          * thread context via iscsit_close_connection() once the other context
4048          * has been reset -> returned sleeping pre-handler state.
4049          */
4050         spin_lock_bh(&conn->cmd_lock);
4051         list_splice_init(&conn->conn_cmd_list, &tmp_list);
4052
4053         list_for_each_entry(cmd, &tmp_list, i_conn_node) {
4054                 struct se_cmd *se_cmd = &cmd->se_cmd;
4055
4056                 if (se_cmd->se_tfo != NULL) {
4057                         spin_lock(&se_cmd->t_state_lock);
4058                         se_cmd->transport_state |= CMD_T_FABRIC_STOP;
4059                         spin_unlock(&se_cmd->t_state_lock);
4060                 }
4061         }
4062         spin_unlock_bh(&conn->cmd_lock);
4063
4064         list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4065                 list_del_init(&cmd->i_conn_node);
4066
4067                 iscsit_increment_maxcmdsn(cmd, sess);
4068                 iscsit_free_cmd(cmd, true);
4069
4070         }
4071 }
4072
4073 static void iscsit_stop_timers_for_cmds(
4074         struct iscsi_conn *conn)
4075 {
4076         struct iscsi_cmd *cmd;
4077
4078         spin_lock_bh(&conn->cmd_lock);
4079         list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4080                 if (cmd->data_direction == DMA_TO_DEVICE)
4081                         iscsit_stop_dataout_timer(cmd);
4082         }
4083         spin_unlock_bh(&conn->cmd_lock);
4084 }
4085
4086 int iscsit_close_connection(
4087         struct iscsi_conn *conn)
4088 {
4089         int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4090         struct iscsi_session    *sess = conn->sess;
4091
4092         pr_debug("Closing iSCSI connection CID %hu on SID:"
4093                 " %u\n", conn->cid, sess->sid);
4094         /*
4095          * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD
4096          * case just in case the RX Thread in iscsi_target_rx_opcode() is
4097          * sleeping and the logout response never got sent because the
4098          * connection failed.
4099          *
4100          * However for iser-target, isert_wait4logout() is using conn_logout_comp
4101          * to signal logout response TX interrupt completion.  Go ahead and skip
4102          * this for iser since isert_rx_opcode() does not wait on logout failure,
4103          * and to avoid iscsi_conn pointer dereference in iser-target code.
4104          */
4105         if (!conn->conn_transport->rdma_shutdown)
4106                 complete(&conn->conn_logout_comp);
4107
4108         if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4109                 if (conn->tx_thread &&
4110                     cmpxchg(&conn->tx_thread_active, true, false)) {
4111                         send_sig(SIGINT, conn->tx_thread, 1);
4112                         kthread_stop(conn->tx_thread);
4113                 }
4114         } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4115                 if (conn->rx_thread &&
4116                     cmpxchg(&conn->rx_thread_active, true, false)) {
4117                         send_sig(SIGINT, conn->rx_thread, 1);
4118                         kthread_stop(conn->rx_thread);
4119                 }
4120         }
4121
4122         spin_lock(&iscsit_global->ts_bitmap_lock);
4123         bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4124                               get_order(1));
4125         spin_unlock(&iscsit_global->ts_bitmap_lock);
4126
4127         iscsit_stop_timers_for_cmds(conn);
4128         iscsit_stop_nopin_response_timer(conn);
4129         iscsit_stop_nopin_timer(conn);
4130
4131         if (conn->conn_transport->iscsit_wait_conn)
4132                 conn->conn_transport->iscsit_wait_conn(conn);
4133
4134         /*
4135          * During Connection recovery drop unacknowledged out of order
4136          * commands for this connection, and prepare the other commands
4137          * for realligence.
4138          *
4139          * During normal operation clear the out of order commands (but
4140          * do not free the struct iscsi_ooo_cmdsn's) and release all
4141          * struct iscsi_cmds.
4142          */
4143         if (atomic_read(&conn->connection_recovery)) {
4144                 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4145                 iscsit_prepare_cmds_for_realligance(conn);
4146         } else {
4147                 iscsit_clear_ooo_cmdsns_for_conn(conn);
4148                 iscsit_release_commands_from_conn(conn);
4149         }
4150         iscsit_free_queue_reqs_for_conn(conn);
4151
4152         /*
4153          * Handle decrementing session or connection usage count if
4154          * a logout response was not able to be sent because the
4155          * connection failed.  Fall back to Session Recovery here.
4156          */
4157         if (atomic_read(&conn->conn_logout_remove)) {
4158                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4159                         iscsit_dec_conn_usage_count(conn);
4160                         iscsit_dec_session_usage_count(sess);
4161                 }
4162                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4163                         iscsit_dec_conn_usage_count(conn);
4164
4165                 atomic_set(&conn->conn_logout_remove, 0);
4166                 atomic_set(&sess->session_reinstatement, 0);
4167                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4168         }
4169
4170         spin_lock_bh(&sess->conn_lock);
4171         list_del(&conn->conn_list);
4172
4173         /*
4174          * Attempt to let the Initiator know this connection failed by
4175          * sending an Connection Dropped Async Message on another
4176          * active connection.
4177          */
4178         if (atomic_read(&conn->connection_recovery))
4179                 iscsit_build_conn_drop_async_message(conn);
4180
4181         spin_unlock_bh(&sess->conn_lock);
4182
4183         /*
4184          * If connection reinstatement is being performed on this connection,
4185          * up the connection reinstatement semaphore that is being blocked on
4186          * in iscsit_cause_connection_reinstatement().
4187          */
4188         spin_lock_bh(&conn->state_lock);
4189         if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4190                 spin_unlock_bh(&conn->state_lock);
4191                 complete(&conn->conn_wait_comp);
4192                 wait_for_completion(&conn->conn_post_wait_comp);
4193                 spin_lock_bh(&conn->state_lock);
4194         }
4195
4196         /*
4197          * If connection reinstatement is being performed on this connection
4198          * by receiving a REMOVECONNFORRECOVERY logout request, up the
4199          * connection wait rcfr semaphore that is being blocked on
4200          * an iscsit_connection_reinstatement_rcfr().
4201          */
4202         if (atomic_read(&conn->connection_wait_rcfr)) {
4203                 spin_unlock_bh(&conn->state_lock);
4204                 complete(&conn->conn_wait_rcfr_comp);
4205                 wait_for_completion(&conn->conn_post_wait_comp);
4206                 spin_lock_bh(&conn->state_lock);
4207         }
4208         atomic_set(&conn->connection_reinstatement, 1);
4209         spin_unlock_bh(&conn->state_lock);
4210
4211         /*
4212          * If any other processes are accessing this connection pointer we
4213          * must wait until they have completed.
4214          */
4215         iscsit_check_conn_usage_count(conn);
4216
4217         ahash_request_free(conn->conn_tx_hash);
4218         if (conn->conn_rx_hash) {
4219                 struct crypto_ahash *tfm;
4220
4221                 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
4222                 ahash_request_free(conn->conn_rx_hash);
4223                 crypto_free_ahash(tfm);
4224         }
4225
4226         free_cpumask_var(conn->conn_cpumask);
4227
4228         kfree(conn->conn_ops);
4229         conn->conn_ops = NULL;
4230
4231         if (conn->sock)
4232                 sock_release(conn->sock);
4233
4234         if (conn->conn_transport->iscsit_free_conn)
4235                 conn->conn_transport->iscsit_free_conn(conn);
4236
4237         iscsit_put_transport(conn->conn_transport);
4238
4239         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4240         conn->conn_state = TARG_CONN_STATE_FREE;
4241         kfree(conn);
4242
4243         spin_lock_bh(&sess->conn_lock);
4244         atomic_dec(&sess->nconn);
4245         pr_debug("Decremented iSCSI connection count to %hu from node:"
4246                 " %s\n", atomic_read(&sess->nconn),
4247                 sess->sess_ops->InitiatorName);
4248         /*
4249          * Make sure that if one connection fails in an non ERL=2 iSCSI
4250          * Session that they all fail.
4251          */
4252         if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4253              !atomic_read(&sess->session_logout))
4254                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4255
4256         /*
4257          * If this was not the last connection in the session, and we are
4258          * performing session reinstatement or falling back to ERL=0, call
4259          * iscsit_stop_session() without sleeping to shutdown the other
4260          * active connections.
4261          */
4262         if (atomic_read(&sess->nconn)) {
4263                 if (!atomic_read(&sess->session_reinstatement) &&
4264                     !atomic_read(&sess->session_fall_back_to_erl0)) {
4265                         spin_unlock_bh(&sess->conn_lock);
4266                         return 0;
4267                 }
4268                 if (!atomic_read(&sess->session_stop_active)) {
4269                         atomic_set(&sess->session_stop_active, 1);
4270                         spin_unlock_bh(&sess->conn_lock);
4271                         iscsit_stop_session(sess, 0, 0);
4272                         return 0;
4273                 }
4274                 spin_unlock_bh(&sess->conn_lock);
4275                 return 0;
4276         }
4277
4278         /*
4279          * If this was the last connection in the session and one of the
4280          * following is occurring:
4281          *
4282          * Session Reinstatement is not being performed, and are falling back
4283          * to ERL=0 call iscsit_close_session().
4284          *
4285          * Session Logout was requested.  iscsit_close_session() will be called
4286          * elsewhere.
4287          *
4288          * Session Continuation is not being performed, start the Time2Retain
4289          * handler and check if sleep_on_sess_wait_sem is active.
4290          */
4291         if (!atomic_read(&sess->session_reinstatement) &&
4292              atomic_read(&sess->session_fall_back_to_erl0)) {
4293                 spin_unlock_bh(&sess->conn_lock);
4294                 iscsit_close_session(sess);
4295
4296                 return 0;
4297         } else if (atomic_read(&sess->session_logout)) {
4298                 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4299                 sess->session_state = TARG_SESS_STATE_FREE;
4300                 spin_unlock_bh(&sess->conn_lock);
4301
4302                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4303                         complete(&sess->session_wait_comp);
4304
4305                 return 0;
4306         } else {
4307                 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4308                 sess->session_state = TARG_SESS_STATE_FAILED;
4309
4310                 if (!atomic_read(&sess->session_continuation)) {
4311                         spin_unlock_bh(&sess->conn_lock);
4312                         iscsit_start_time2retain_handler(sess);
4313                 } else
4314                         spin_unlock_bh(&sess->conn_lock);
4315
4316                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4317                         complete(&sess->session_wait_comp);
4318
4319                 return 0;
4320         }
4321 }
4322
4323 /*
4324  * If the iSCSI Session for the iSCSI Initiator Node exists,
4325  * forcefully shutdown the iSCSI NEXUS.
4326  */
4327 int iscsit_close_session(struct iscsi_session *sess)
4328 {
4329         struct iscsi_portal_group *tpg = sess->tpg;
4330         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4331
4332         if (atomic_read(&sess->nconn)) {
4333                 pr_err("%d connection(s) still exist for iSCSI session"
4334                         " to %s\n", atomic_read(&sess->nconn),
4335                         sess->sess_ops->InitiatorName);
4336                 BUG();
4337         }
4338
4339         spin_lock_bh(&se_tpg->session_lock);
4340         atomic_set(&sess->session_logout, 1);
4341         atomic_set(&sess->session_reinstatement, 1);
4342         iscsit_stop_time2retain_timer(sess);
4343         spin_unlock_bh(&se_tpg->session_lock);
4344
4345         /*
4346          * transport_deregister_session_configfs() will clear the
4347          * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4348          * can be setting it again with __transport_register_session() in
4349          * iscsi_post_login_handler() again after the iscsit_stop_session()
4350          * completes in iscsi_np context.
4351          */
4352         transport_deregister_session_configfs(sess->se_sess);
4353
4354         /*
4355          * If any other processes are accessing this session pointer we must
4356          * wait until they have completed.  If we are in an interrupt (the
4357          * time2retain handler) and contain and active session usage count we
4358          * restart the timer and exit.
4359          */
4360         if (!in_interrupt()) {
4361                 if (iscsit_check_session_usage_count(sess) == 1)
4362                         iscsit_stop_session(sess, 1, 1);
4363         } else {
4364                 if (iscsit_check_session_usage_count(sess) == 2) {
4365                         atomic_set(&sess->session_logout, 0);
4366                         iscsit_start_time2retain_handler(sess);
4367                         return 0;
4368                 }
4369         }
4370
4371         transport_deregister_session(sess->se_sess);
4372
4373         if (sess->sess_ops->ErrorRecoveryLevel == 2)
4374                 iscsit_free_connection_recovery_entires(sess);
4375
4376         iscsit_free_all_ooo_cmdsns(sess);
4377
4378         spin_lock_bh(&se_tpg->session_lock);
4379         pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4380         sess->session_state = TARG_SESS_STATE_FREE;
4381         pr_debug("Released iSCSI session from node: %s\n",
4382                         sess->sess_ops->InitiatorName);
4383         tpg->nsessions--;
4384         if (tpg->tpg_tiqn)
4385                 tpg->tpg_tiqn->tiqn_nsessions--;
4386
4387         pr_debug("Decremented number of active iSCSI Sessions on"
4388                 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4389
4390         spin_lock(&sess_idr_lock);
4391         idr_remove(&sess_idr, sess->session_index);
4392         spin_unlock(&sess_idr_lock);
4393
4394         kfree(sess->sess_ops);
4395         sess->sess_ops = NULL;
4396         spin_unlock_bh(&se_tpg->session_lock);
4397
4398         kfree(sess);
4399         return 0;
4400 }
4401
4402 static void iscsit_logout_post_handler_closesession(
4403         struct iscsi_conn *conn)
4404 {
4405         struct iscsi_session *sess = conn->sess;
4406         int sleep = 1;
4407         /*
4408          * Traditional iscsi/tcp will invoke this logic from TX thread
4409          * context during session logout, so clear tx_thread_active and
4410          * sleep if iscsit_close_connection() has not already occured.
4411          *
4412          * Since iser-target invokes this logic from it's own workqueue,
4413          * always sleep waiting for RX/TX thread shutdown to complete
4414          * within iscsit_close_connection().
4415          */
4416         if (!conn->conn_transport->rdma_shutdown)
4417                 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4418
4419         atomic_set(&conn->conn_logout_remove, 0);
4420         complete(&conn->conn_logout_comp);
4421
4422         iscsit_dec_conn_usage_count(conn);
4423         iscsit_stop_session(sess, sleep, sleep);
4424         iscsit_dec_session_usage_count(sess);
4425         iscsit_close_session(sess);
4426 }
4427
4428 static void iscsit_logout_post_handler_samecid(
4429         struct iscsi_conn *conn)
4430 {
4431         int sleep = 1;
4432
4433         if (!conn->conn_transport->rdma_shutdown)
4434                 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4435
4436         atomic_set(&conn->conn_logout_remove, 0);
4437         complete(&conn->conn_logout_comp);
4438
4439         iscsit_cause_connection_reinstatement(conn, sleep);
4440         iscsit_dec_conn_usage_count(conn);
4441 }
4442
4443 static void iscsit_logout_post_handler_diffcid(
4444         struct iscsi_conn *conn,
4445         u16 cid)
4446 {
4447         struct iscsi_conn *l_conn;
4448         struct iscsi_session *sess = conn->sess;
4449         bool conn_found = false;
4450
4451         if (!sess)
4452                 return;
4453
4454         spin_lock_bh(&sess->conn_lock);
4455         list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4456                 if (l_conn->cid == cid) {
4457                         iscsit_inc_conn_usage_count(l_conn);
4458                         conn_found = true;
4459                         break;
4460                 }
4461         }
4462         spin_unlock_bh(&sess->conn_lock);
4463
4464         if (!conn_found)
4465                 return;
4466
4467         if (l_conn->sock)
4468                 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4469
4470         spin_lock_bh(&l_conn->state_lock);
4471         pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4472         l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4473         spin_unlock_bh(&l_conn->state_lock);
4474
4475         iscsit_cause_connection_reinstatement(l_conn, 1);
4476         iscsit_dec_conn_usage_count(l_conn);
4477 }
4478
4479 /*
4480  *      Return of 0 causes the TX thread to restart.
4481  */
4482 int iscsit_logout_post_handler(
4483         struct iscsi_cmd *cmd,
4484         struct iscsi_conn *conn)
4485 {
4486         int ret = 0;
4487
4488         switch (cmd->logout_reason) {
4489         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4490                 switch (cmd->logout_response) {
4491                 case ISCSI_LOGOUT_SUCCESS:
4492                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4493                 default:
4494                         iscsit_logout_post_handler_closesession(conn);
4495                         break;
4496                 }
4497                 ret = 0;
4498                 break;
4499         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4500                 if (conn->cid == cmd->logout_cid) {
4501                         switch (cmd->logout_response) {
4502                         case ISCSI_LOGOUT_SUCCESS:
4503                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4504                         default:
4505                                 iscsit_logout_post_handler_samecid(conn);
4506                                 break;
4507                         }
4508                         ret = 0;
4509                 } else {
4510                         switch (cmd->logout_response) {
4511                         case ISCSI_LOGOUT_SUCCESS:
4512                                 iscsit_logout_post_handler_diffcid(conn,
4513                                         cmd->logout_cid);
4514                                 break;
4515                         case ISCSI_LOGOUT_CID_NOT_FOUND:
4516                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4517                         default:
4518                                 break;
4519                         }
4520                         ret = 1;
4521                 }
4522                 break;
4523         case ISCSI_LOGOUT_REASON_RECOVERY:
4524                 switch (cmd->logout_response) {
4525                 case ISCSI_LOGOUT_SUCCESS:
4526                 case ISCSI_LOGOUT_CID_NOT_FOUND:
4527                 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4528                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4529                 default:
4530                         break;
4531                 }
4532                 ret = 1;
4533                 break;
4534         default:
4535                 break;
4536
4537         }
4538         return ret;
4539 }
4540 EXPORT_SYMBOL(iscsit_logout_post_handler);
4541
4542 void iscsit_fail_session(struct iscsi_session *sess)
4543 {
4544         struct iscsi_conn *conn;
4545
4546         spin_lock_bh(&sess->conn_lock);
4547         list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4548                 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4549                 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4550         }
4551         spin_unlock_bh(&sess->conn_lock);
4552
4553         pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4554         sess->session_state = TARG_SESS_STATE_FAILED;
4555 }
4556
4557 int iscsit_free_session(struct iscsi_session *sess)
4558 {
4559         u16 conn_count = atomic_read(&sess->nconn);
4560         struct iscsi_conn *conn, *conn_tmp = NULL;
4561         int is_last;
4562
4563         spin_lock_bh(&sess->conn_lock);
4564         atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4565
4566         list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4567                         conn_list) {
4568                 if (conn_count == 0)
4569                         break;
4570
4571                 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4572                         is_last = 1;
4573                 } else {
4574                         iscsit_inc_conn_usage_count(conn_tmp);
4575                         is_last = 0;
4576                 }
4577                 iscsit_inc_conn_usage_count(conn);
4578
4579                 spin_unlock_bh(&sess->conn_lock);
4580                 iscsit_cause_connection_reinstatement(conn, 1);
4581                 spin_lock_bh(&sess->conn_lock);
4582
4583                 iscsit_dec_conn_usage_count(conn);
4584                 if (is_last == 0)
4585                         iscsit_dec_conn_usage_count(conn_tmp);
4586
4587                 conn_count--;
4588         }
4589
4590         if (atomic_read(&sess->nconn)) {
4591                 spin_unlock_bh(&sess->conn_lock);
4592                 wait_for_completion(&sess->session_wait_comp);
4593         } else
4594                 spin_unlock_bh(&sess->conn_lock);
4595
4596         iscsit_close_session(sess);
4597         return 0;
4598 }
4599
4600 void iscsit_stop_session(
4601         struct iscsi_session *sess,
4602         int session_sleep,
4603         int connection_sleep)
4604 {
4605         u16 conn_count = atomic_read(&sess->nconn);
4606         struct iscsi_conn *conn, *conn_tmp = NULL;
4607         int is_last;
4608
4609         spin_lock_bh(&sess->conn_lock);
4610         if (session_sleep)
4611                 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4612
4613         if (connection_sleep) {
4614                 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4615                                 conn_list) {
4616                         if (conn_count == 0)
4617                                 break;
4618
4619                         if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4620                                 is_last = 1;
4621                         } else {
4622                                 iscsit_inc_conn_usage_count(conn_tmp);
4623                                 is_last = 0;
4624                         }
4625                         iscsit_inc_conn_usage_count(conn);
4626
4627                         spin_unlock_bh(&sess->conn_lock);
4628                         iscsit_cause_connection_reinstatement(conn, 1);
4629                         spin_lock_bh(&sess->conn_lock);
4630
4631                         iscsit_dec_conn_usage_count(conn);
4632                         if (is_last == 0)
4633                                 iscsit_dec_conn_usage_count(conn_tmp);
4634                         conn_count--;
4635                 }
4636         } else {
4637                 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4638                         iscsit_cause_connection_reinstatement(conn, 0);
4639         }
4640
4641         if (session_sleep && atomic_read(&sess->nconn)) {
4642                 spin_unlock_bh(&sess->conn_lock);
4643                 wait_for_completion(&sess->session_wait_comp);
4644         } else
4645                 spin_unlock_bh(&sess->conn_lock);
4646 }
4647
4648 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4649 {
4650         struct iscsi_session *sess;
4651         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4652         struct se_session *se_sess, *se_sess_tmp;
4653         LIST_HEAD(free_list);
4654         int session_count = 0;
4655
4656         spin_lock_bh(&se_tpg->session_lock);
4657         if (tpg->nsessions && !force) {
4658                 spin_unlock_bh(&se_tpg->session_lock);
4659                 return -1;
4660         }
4661
4662         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4663                         sess_list) {
4664                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4665
4666                 spin_lock(&sess->conn_lock);
4667                 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4668                     atomic_read(&sess->session_logout) ||
4669                     (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4670                         spin_unlock(&sess->conn_lock);
4671                         continue;
4672                 }
4673                 atomic_set(&sess->session_reinstatement, 1);
4674                 spin_unlock(&sess->conn_lock);
4675
4676                 list_move_tail(&se_sess->sess_list, &free_list);
4677         }
4678         spin_unlock_bh(&se_tpg->session_lock);
4679
4680         list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
4681                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4682
4683                 iscsit_free_session(sess);
4684                 session_count++;
4685         }
4686
4687         pr_debug("Released %d iSCSI Session(s) from Target Portal"
4688                         " Group: %hu\n", session_count, tpg->tpgt);
4689         return 0;
4690 }
4691
4692 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4693 MODULE_VERSION("4.1.x");
4694 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4695 MODULE_LICENSE("GPL");
4696
4697 module_init(iscsi_target_init_module);
4698 module_exit(iscsi_target_cleanup_module);