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 <linux/delay.h>
  27 #include <linux/sched/signal.h>
  28 #include <asm/unaligned.h>
  29 #include <net/ipv6.h>
  30 #include <scsi/scsi_proto.h>
  31 #include <scsi/iscsi_proto.h>
  32 #include <scsi/scsi_tcq.h>
  33 #include <target/target_core_base.h>
  34 #include <target/target_core_fabric.h>
  35
  36 #include <target/iscsi/iscsi_target_core.h>
  37 #include "iscsi_target_parameters.h"
  38 #include "iscsi_target_seq_pdu_list.h"
  39 #include "iscsi_target_datain_values.h"
  40 #include "iscsi_target_erl0.h"
  41 #include "iscsi_target_erl1.h"
  42 #include "iscsi_target_erl2.h"
  43 #include "iscsi_target_login.h"
  44 #include "iscsi_target_tmr.h"
  45 #include "iscsi_target_tpg.h"
  46 #include "iscsi_target_util.h"
  47 #include "iscsi_target.h"
  48 #include "iscsi_target_device.h"
  49 #include <target/iscsi/iscsi_target_stat.h>
  50
  51 #include <target/iscsi/iscsi_transport.h>
  52
  53 static LIST_HEAD(g_tiqn_list);
  54 static LIST_HEAD(g_np_list);
  55 static DEFINE_SPINLOCK(tiqn_lock);
  56 static DEFINE_MUTEX(np_lock);
  57
  58 static struct idr tiqn_idr;
  59 struct idr sess_idr;
  60 struct mutex auth_id_lock;
  61 spinlock_t sess_idr_lock;
  62
  63 struct iscsit_global *iscsit_global;
  64
  65 struct kmem_cache *lio_qr_cache;
  66 struct kmem_cache *lio_dr_cache;
  67 struct kmem_cache *lio_ooo_cache;
  68 struct kmem_cache *lio_r2t_cache;
  69
  70 static int iscsit_handle_immediate_data(struct iscsi_cmd *,
  71                         struct iscsi_scsi_req *, u32);
  72
  73 struct iscsi_tiqn *iscsit_get_tiqn_for_login(unsigned char *buf)
  74 {
  75         struct iscsi_tiqn *tiqn = NULL;
  76
  77         spin_lock(&tiqn_lock);
  78         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
  79                 if (!strcmp(tiqn->tiqn, buf)) {
  80
  81                         spin_lock(&tiqn->tiqn_state_lock);
  82                         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
  83                                 tiqn->tiqn_access_count++;
  84                                 spin_unlock(&tiqn->tiqn_state_lock);
  85                                 spin_unlock(&tiqn_lock);
  86                                 return tiqn;
  87                         }
  88                         spin_unlock(&tiqn->tiqn_state_lock);
  89                 }
  90         }
  91         spin_unlock(&tiqn_lock);
  92
  93         return NULL;
  94 }
  95
  96 static int iscsit_set_tiqn_shutdown(struct iscsi_tiqn *tiqn)
  97 {
  98         spin_lock(&tiqn->tiqn_state_lock);
  99         if (tiqn->tiqn_state == TIQN_STATE_ACTIVE) {
 100                 tiqn->tiqn_state = TIQN_STATE_SHUTDOWN;
 101                 spin_unlock(&tiqn->tiqn_state_lock);
 102                 return 0;
 103         }
 104         spin_unlock(&tiqn->tiqn_state_lock);
 105
 106         return -1;
 107 }
 108
 109 void iscsit_put_tiqn_for_login(struct iscsi_tiqn *tiqn)
 110 {
 111         spin_lock(&tiqn->tiqn_state_lock);
 112         tiqn->tiqn_access_count--;
 113         spin_unlock(&tiqn->tiqn_state_lock);
 114 }
 115
 116 /*
 117  * Note that IQN formatting is expected to be done in userspace, and
 118  * no explict IQN format checks are done here.
 119  */
 120 struct iscsi_tiqn *iscsit_add_tiqn(unsigned char *buf)
 121 {
 122         struct iscsi_tiqn *tiqn = NULL;
 123         int ret;
 124
 125         if (strlen(buf) >= ISCSI_IQN_LEN) {
 126                 pr_err("Target IQN exceeds %d bytes\n",
 127                                 ISCSI_IQN_LEN);
 128                 return ERR_PTR(-EINVAL);
 129         }
 130
 131         tiqn = kzalloc(sizeof(*tiqn), GFP_KERNEL);
 132         if (!tiqn)
 133                 return ERR_PTR(-ENOMEM);
 134
 135         sprintf(tiqn->tiqn, "%s", buf);
 136         INIT_LIST_HEAD(&tiqn->tiqn_list);
 137         INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
 138         spin_lock_init(&tiqn->tiqn_state_lock);
 139         spin_lock_init(&tiqn->tiqn_tpg_lock);
 140         spin_lock_init(&tiqn->sess_err_stats.lock);
 141         spin_lock_init(&tiqn->login_stats.lock);
 142         spin_lock_init(&tiqn->logout_stats.lock);
 143
 144         tiqn->tiqn_state = TIQN_STATE_ACTIVE;
 145
 146         idr_preload(GFP_KERNEL);
 147         spin_lock(&tiqn_lock);
 148
 149         ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
 150         if (ret < 0) {
 151                 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
 152                 spin_unlock(&tiqn_lock);
 153                 idr_preload_end();
 154                 kfree(tiqn);
 155                 return ERR_PTR(ret);
 156         }
 157         tiqn->tiqn_index = ret;
 158         list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
 159
 160         spin_unlock(&tiqn_lock);
 161         idr_preload_end();
 162
 163         pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
 164
 165         return tiqn;
 166
 167 }
 168
 169 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
 170 {
 171         /*
 172          * Wait for accesses to said struct iscsi_tiqn to end.
 173          */
 174         spin_lock(&tiqn->tiqn_state_lock);
 175         while (tiqn->tiqn_access_count != 0) {
 176                 spin_unlock(&tiqn->tiqn_state_lock);
 177                 msleep(10);
 178                 spin_lock(&tiqn->tiqn_state_lock);
 179         }
 180         spin_unlock(&tiqn->tiqn_state_lock);
 181 }
 182
 183 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
 184 {
 185         /*
 186          * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
 187          * while holding tiqn->tiqn_state_lock.  This means that all subsequent
 188          * attempts to access this struct iscsi_tiqn will fail from both transport
 189          * fabric and control code paths.
 190          */
 191         if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
 192                 pr_err("iscsit_set_tiqn_shutdown() failed\n");
 193                 return;
 194         }
 195
 196         iscsit_wait_for_tiqn(tiqn);
 197
 198         spin_lock(&tiqn_lock);
 199         list_del(&tiqn->tiqn_list);
 200         idr_remove(&tiqn_idr, tiqn->tiqn_index);
 201         spin_unlock(&tiqn_lock);
 202
 203         pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
 204                         tiqn->tiqn);
 205         kfree(tiqn);
 206 }
 207
 208 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
 209 {
 210         int ret;
 211         /*
 212          * Determine if the network portal is accepting storage traffic.
 213          */
 214         spin_lock_bh(&np->np_thread_lock);
 215         if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 216                 spin_unlock_bh(&np->np_thread_lock);
 217                 return -1;
 218         }
 219         spin_unlock_bh(&np->np_thread_lock);
 220         /*
 221          * Determine if the portal group is accepting storage traffic.
 222          */
 223         spin_lock_bh(&tpg->tpg_state_lock);
 224         if (tpg->tpg_state != TPG_STATE_ACTIVE) {
 225                 spin_unlock_bh(&tpg->tpg_state_lock);
 226                 return -1;
 227         }
 228         spin_unlock_bh(&tpg->tpg_state_lock);
 229
 230         /*
 231          * Here we serialize access across the TIQN+TPG Tuple.
 232          */
 233         ret = down_interruptible(&tpg->np_login_sem);
 234         if (ret != 0)
 235                 return -1;
 236
 237         spin_lock_bh(&tpg->tpg_state_lock);
 238         if (tpg->tpg_state != TPG_STATE_ACTIVE) {
 239                 spin_unlock_bh(&tpg->tpg_state_lock);
 240                 up(&tpg->np_login_sem);
 241                 return -1;
 242         }
 243         spin_unlock_bh(&tpg->tpg_state_lock);
 244
 245         return 0;
 246 }
 247
 248 void iscsit_login_kref_put(struct kref *kref)
 249 {
 250         struct iscsi_tpg_np *tpg_np = container_of(kref,
 251                                 struct iscsi_tpg_np, tpg_np_kref);
 252
 253         complete(&tpg_np->tpg_np_comp);
 254 }
 255
 256 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg,
 257                        struct iscsi_tpg_np *tpg_np)
 258 {
 259         struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
 260
 261         up(&tpg->np_login_sem);
 262
 263         if (tpg_np)
 264                 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
 265
 266         if (tiqn)
 267                 iscsit_put_tiqn_for_login(tiqn);
 268
 269         return 0;
 270 }
 271
 272 bool iscsit_check_np_match(
 273         struct sockaddr_storage *sockaddr,
 274         struct iscsi_np *np,
 275         int network_transport)
 276 {
 277         struct sockaddr_in *sock_in, *sock_in_e;
 278         struct sockaddr_in6 *sock_in6, *sock_in6_e;
 279         bool ip_match = false;
 280         u16 port, port_e;
 281
 282         if (sockaddr->ss_family == AF_INET6) {
 283                 sock_in6 = (struct sockaddr_in6 *)sockaddr;
 284                 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
 285
 286                 if (!memcmp(&sock_in6->sin6_addr.in6_u,
 287                             &sock_in6_e->sin6_addr.in6_u,
 288                             sizeof(struct in6_addr)))
 289                         ip_match = true;
 290
 291                 port = ntohs(sock_in6->sin6_port);
 292                 port_e = ntohs(sock_in6_e->sin6_port);
 293         } else {
 294                 sock_in = (struct sockaddr_in *)sockaddr;
 295                 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
 296
 297                 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
 298                         ip_match = true;
 299
 300                 port = ntohs(sock_in->sin_port);
 301                 port_e = ntohs(sock_in_e->sin_port);
 302         }
 303
 304         if (ip_match && (port_e == port) &&
 305             (np->np_network_transport == network_transport))
 306                 return true;
 307
 308         return false;
 309 }
 310
 311 /*
 312  * Called with mutex np_lock held
 313  */
 314 static struct iscsi_np *iscsit_get_np(
 315         struct sockaddr_storage *sockaddr,
 316         int network_transport)
 317 {
 318         struct iscsi_np *np;
 319         bool match;
 320
 321         list_for_each_entry(np, &g_np_list, np_list) {
 322                 spin_lock_bh(&np->np_thread_lock);
 323                 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 324                         spin_unlock_bh(&np->np_thread_lock);
 325                         continue;
 326                 }
 327
 328                 match = iscsit_check_np_match(sockaddr, np, network_transport);
 329                 if (match) {
 330                         /*
 331                          * Increment the np_exports reference count now to
 332                          * prevent iscsit_del_np() below from being called
 333                          * while iscsi_tpg_add_network_portal() is called.
 334                          */
 335                         np->np_exports++;
 336                         spin_unlock_bh(&np->np_thread_lock);
 337                         return np;
 338                 }
 339                 spin_unlock_bh(&np->np_thread_lock);
 340         }
 341
 342         return NULL;
 343 }
 344
 345 struct iscsi_np *iscsit_add_np(
 346         struct sockaddr_storage *sockaddr,
 347         int network_transport)
 348 {
 349         struct iscsi_np *np;
 350         int ret;
 351
 352         mutex_lock(&np_lock);
 353
 354         /*
 355          * Locate the existing struct iscsi_np if already active..
 356          */
 357         np = iscsit_get_np(sockaddr, network_transport);
 358         if (np) {
 359                 mutex_unlock(&np_lock);
 360                 return np;
 361         }
 362
 363         np = kzalloc(sizeof(*np), GFP_KERNEL);
 364         if (!np) {
 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         timer_setup(&np->np_login_timer, iscsi_handle_login_thread_timeout, 0);
 376
 377         ret = iscsi_target_setup_login_socket(np, sockaddr);
 378         if (ret != 0) {
 379                 kfree(np);
 380                 mutex_unlock(&np_lock);
 381                 return ERR_PTR(ret);
 382         }
 383
 384         np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
 385         if (IS_ERR(np->np_thread)) {
 386                 pr_err("Unable to create kthread: iscsi_np\n");
 387                 ret = PTR_ERR(np->np_thread);
 388                 kfree(np);
 389                 mutex_unlock(&np_lock);
 390                 return ERR_PTR(ret);
 391         }
 392         /*
 393          * Increment the np_exports reference count now to prevent
 394          * iscsit_del_np() below from being run while a new call to
 395          * iscsi_tpg_add_network_portal() for a matching iscsi_np is
 396          * active.  We don't need to hold np->np_thread_lock at this
 397          * point because iscsi_np has not been added to g_np_list yet.
 398          */
 399         np->np_exports = 1;
 400         np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
 401
 402         list_add_tail(&np->np_list, &g_np_list);
 403         mutex_unlock(&np_lock);
 404
 405         pr_debug("CORE[0] - Added Network Portal: %pISpc on %s\n",
 406                 &np->np_sockaddr, np->np_transport->name);
 407
 408         return np;
 409 }
 410
 411 int iscsit_reset_np_thread(
 412         struct iscsi_np *np,
 413         struct iscsi_tpg_np *tpg_np,
 414         struct iscsi_portal_group *tpg,
 415         bool shutdown)
 416 {
 417         spin_lock_bh(&np->np_thread_lock);
 418         if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
 419                 spin_unlock_bh(&np->np_thread_lock);
 420                 return 0;
 421         }
 422         np->np_thread_state = ISCSI_NP_THREAD_RESET;
 423         atomic_inc(&np->np_reset_count);
 424
 425         if (np->np_thread) {
 426                 spin_unlock_bh(&np->np_thread_lock);
 427                 send_sig(SIGINT, np->np_thread, 1);
 428                 wait_for_completion(&np->np_restart_comp);
 429                 spin_lock_bh(&np->np_thread_lock);
 430         }
 431         spin_unlock_bh(&np->np_thread_lock);
 432
 433         if (tpg_np && shutdown) {
 434                 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
 435
 436                 wait_for_completion(&tpg_np->tpg_np_comp);
 437         }
 438
 439         return 0;
 440 }
 441
 442 static void iscsit_free_np(struct iscsi_np *np)
 443 {
 444         if (np->np_socket)
 445                 sock_release(np->np_socket);
 446 }
 447
 448 int iscsit_del_np(struct iscsi_np *np)
 449 {
 450         spin_lock_bh(&np->np_thread_lock);
 451         np->np_exports--;
 452         if (np->np_exports) {
 453                 np->enabled = true;
 454                 spin_unlock_bh(&np->np_thread_lock);
 455                 return 0;
 456         }
 457         np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
 458         spin_unlock_bh(&np->np_thread_lock);
 459
 460         if (np->np_thread) {
 461                 /*
 462                  * We need to send the signal to wakeup Linux/Net
 463                  * which may be sleeping in sock_accept()..
 464                  */
 465                 send_sig(SIGINT, np->np_thread, 1);
 466                 kthread_stop(np->np_thread);
 467                 np->np_thread = NULL;
 468         }
 469
 470         np->np_transport->iscsit_free_np(np);
 471
 472         mutex_lock(&np_lock);
 473         list_del(&np->np_list);
 474         mutex_unlock(&np_lock);
 475
 476         pr_debug("CORE[0] - Removed Network Portal: %pISpc on %s\n",
 477                 &np->np_sockaddr, np->np_transport->name);
 478
 479         iscsit_put_transport(np->np_transport);
 480         kfree(np);
 481         return 0;
 482 }
 483
 484 static void iscsit_get_rx_pdu(struct iscsi_conn *);
 485
 486 int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
 487 {
 488         return iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
 489 }
 490 EXPORT_SYMBOL(iscsit_queue_rsp);
 491
 492 void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *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, 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, const void *, void *);
 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                                           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, &cmd->pad_bytes,
 554                                                   &cmd->data_crc);
 555
 556                         iov[niov].iov_base = &cmd->data_crc;
 557                         iov[niov++].iov_len = ISCSI_CRC_LEN;
 558                         tx_size += ISCSI_CRC_LEN;
 559                         pr_debug("Attached DataDigest for %u"
 560                                  " bytes opcode 0x%x, CRC 0x%08x\n",
 561                                  data_buf_len, hdr->opcode, cmd->data_crc);
 562                 }
 563         }
 564
 565         cmd->iov_misc_count = niov;
 566         cmd->tx_size = tx_size;
 567
 568         ret = iscsit_send_tx_data(cmd, conn, 1);
 569         if (ret < 0) {
 570                 iscsit_tx_thread_wait_for_tcp(conn);
 571                 return ret;
 572         }
 573
 574         return 0;
 575 }
 576
 577 static int iscsit_map_iovec(struct iscsi_cmd *, struct kvec *, u32, u32);
 578 static void iscsit_unmap_iovec(struct iscsi_cmd *);
 579 static u32 iscsit_do_crypto_hash_sg(struct ahash_request *, struct iscsi_cmd *,
 580                                     u32, u32, u32, u8 *);
 581 static int
 582 iscsit_xmit_datain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 583                        const struct iscsi_datain *datain)
 584 {
 585         struct kvec *iov;
 586         u32 iov_count = 0, tx_size = 0;
 587         int ret, iov_ret;
 588
 589         iov = &cmd->iov_data[0];
 590         iov[iov_count].iov_base = cmd->pdu;
 591         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
 592         tx_size += ISCSI_HDR_LEN;
 593
 594         if (conn->conn_ops->HeaderDigest) {
 595                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
 596
 597                 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, cmd->pdu,
 598                                           ISCSI_HDR_LEN, 0, NULL,
 599                                           header_digest);
 600
 601                 iov[0].iov_len += ISCSI_CRC_LEN;
 602                 tx_size += ISCSI_CRC_LEN;
 603
 604                 pr_debug("Attaching CRC32 HeaderDigest for DataIN PDU 0x%08x\n",
 605                          *header_digest);
 606         }
 607
 608         iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
 609                                    datain->offset, datain->length);
 610         if (iov_ret < 0)
 611                 return -1;
 612
 613         iov_count += iov_ret;
 614         tx_size += datain->length;
 615
 616         cmd->padding = ((-datain->length) & 3);
 617         if (cmd->padding) {
 618                 iov[iov_count].iov_base         = cmd->pad_bytes;
 619                 iov[iov_count++].iov_len        = cmd->padding;
 620                 tx_size += cmd->padding;
 621
 622                 pr_debug("Attaching %u padding bytes\n", cmd->padding);
 623         }
 624
 625         if (conn->conn_ops->DataDigest) {
 626                 cmd->data_crc = iscsit_do_crypto_hash_sg(conn->conn_tx_hash,
 627                                                          cmd, datain->offset,
 628                                                          datain->length,
 629                                                          cmd->padding,
 630                                                          cmd->pad_bytes);
 631
 632                 iov[iov_count].iov_base = &cmd->data_crc;
 633                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
 634                 tx_size += ISCSI_CRC_LEN;
 635
 636                 pr_debug("Attached CRC32C DataDigest %d bytes, crc 0x%08x\n",
 637                          datain->length + cmd->padding, cmd->data_crc);
 638         }
 639
 640         cmd->iov_data_count = iov_count;
 641         cmd->tx_size = tx_size;
 642
 643         ret = iscsit_fe_sendpage_sg(cmd, conn);
 644
 645         iscsit_unmap_iovec(cmd);
 646
 647         if (ret < 0) {
 648                 iscsit_tx_thread_wait_for_tcp(conn);
 649                 return ret;
 650         }
 651
 652         return 0;
 653 }
 654
 655 static int iscsit_xmit_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 656                            struct iscsi_datain_req *dr, const void *buf,
 657                            u32 buf_len)
 658 {
 659         if (dr)
 660                 return iscsit_xmit_datain_pdu(conn, cmd, buf);
 661         else
 662                 return iscsit_xmit_nondatain_pdu(conn, cmd, buf, buf_len);
 663 }
 664
 665 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn)
 666 {
 667         return TARGET_PROT_NORMAL;
 668 }
 669
 670 static struct iscsit_transport iscsi_target_transport = {
 671         .name                   = "iSCSI/TCP",
 672         .transport_type         = ISCSI_TCP,
 673         .rdma_shutdown          = false,
 674         .owner                  = NULL,
 675         .iscsit_setup_np        = iscsit_setup_np,
 676         .iscsit_accept_np       = iscsit_accept_np,
 677         .iscsit_free_np         = iscsit_free_np,
 678         .iscsit_get_login_rx    = iscsit_get_login_rx,
 679         .iscsit_put_login_tx    = iscsit_put_login_tx,
 680         .iscsit_get_dataout     = iscsit_build_r2ts_for_cmd,
 681         .iscsit_immediate_queue = iscsit_immediate_queue,
 682         .iscsit_response_queue  = iscsit_response_queue,
 683         .iscsit_queue_data_in   = iscsit_queue_rsp,
 684         .iscsit_queue_status    = iscsit_queue_rsp,
 685         .iscsit_aborted_task    = iscsit_aborted_task,
 686         .iscsit_xmit_pdu        = iscsit_xmit_pdu,
 687         .iscsit_get_rx_pdu      = iscsit_get_rx_pdu,
 688         .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops,
 689 };
 690
 691 static int __init iscsi_target_init_module(void)
 692 {
 693         int ret = 0, size;
 694
 695         pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
 696         iscsit_global = kzalloc(sizeof(*iscsit_global), GFP_KERNEL);
 697         if (!iscsit_global)
 698                 return -1;
 699
 700         spin_lock_init(&iscsit_global->ts_bitmap_lock);
 701         mutex_init(&auth_id_lock);
 702         spin_lock_init(&sess_idr_lock);
 703         idr_init(&tiqn_idr);
 704         idr_init(&sess_idr);
 705
 706         ret = target_register_template(&iscsi_ops);
 707         if (ret)
 708                 goto out;
 709
 710         size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long);
 711         iscsit_global->ts_bitmap = vzalloc(size);
 712         if (!iscsit_global->ts_bitmap)
 713                 goto configfs_out;
 714
 715         lio_qr_cache = kmem_cache_create("lio_qr_cache",
 716                         sizeof(struct iscsi_queue_req),
 717                         __alignof__(struct iscsi_queue_req), 0, NULL);
 718         if (!lio_qr_cache) {
 719                 pr_err("nable to kmem_cache_create() for"
 720                                 " lio_qr_cache\n");
 721                 goto bitmap_out;
 722         }
 723
 724         lio_dr_cache = kmem_cache_create("lio_dr_cache",
 725                         sizeof(struct iscsi_datain_req),
 726                         __alignof__(struct iscsi_datain_req), 0, NULL);
 727         if (!lio_dr_cache) {
 728                 pr_err("Unable to kmem_cache_create() for"
 729                                 " lio_dr_cache\n");
 730                 goto qr_out;
 731         }
 732
 733         lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
 734                         sizeof(struct iscsi_ooo_cmdsn),
 735                         __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
 736         if (!lio_ooo_cache) {
 737                 pr_err("Unable to kmem_cache_create() for"
 738                                 " lio_ooo_cache\n");
 739                 goto dr_out;
 740         }
 741
 742         lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
 743                         sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
 744                         0, NULL);
 745         if (!lio_r2t_cache) {
 746                 pr_err("Unable to kmem_cache_create() for"
 747                                 " lio_r2t_cache\n");
 748                 goto ooo_out;
 749         }
 750
 751         iscsit_register_transport(&iscsi_target_transport);
 752
 753         if (iscsit_load_discovery_tpg() < 0)
 754                 goto r2t_out;
 755
 756         return ret;
 757 r2t_out:
 758         iscsit_unregister_transport(&iscsi_target_transport);
 759         kmem_cache_destroy(lio_r2t_cache);
 760 ooo_out:
 761         kmem_cache_destroy(lio_ooo_cache);
 762 dr_out:
 763         kmem_cache_destroy(lio_dr_cache);
 764 qr_out:
 765         kmem_cache_destroy(lio_qr_cache);
 766 bitmap_out:
 767         vfree(iscsit_global->ts_bitmap);
 768 configfs_out:
 769         /* XXX: this probably wants it to be it's own unwind step.. */
 770         if (iscsit_global->discovery_tpg)
 771                 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
 772         target_unregister_template(&iscsi_ops);
 773 out:
 774         kfree(iscsit_global);
 775         return -ENOMEM;
 776 }
 777
 778 static void __exit iscsi_target_cleanup_module(void)
 779 {
 780         iscsit_release_discovery_tpg();
 781         iscsit_unregister_transport(&iscsi_target_transport);
 782         kmem_cache_destroy(lio_qr_cache);
 783         kmem_cache_destroy(lio_dr_cache);
 784         kmem_cache_destroy(lio_ooo_cache);
 785         kmem_cache_destroy(lio_r2t_cache);
 786
 787         /*
 788          * Shutdown discovery sessions and disable discovery TPG
 789          */
 790         if (iscsit_global->discovery_tpg)
 791                 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
 792
 793         target_unregister_template(&iscsi_ops);
 794
 795         vfree(iscsit_global->ts_bitmap);
 796         kfree(iscsit_global);
 797 }
 798
 799 int iscsit_add_reject(
 800         struct iscsi_conn *conn,
 801         u8 reason,
 802         unsigned char *buf)
 803 {
 804         struct iscsi_cmd *cmd;
 805
 806         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
 807         if (!cmd)
 808                 return -1;
 809
 810         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 811         cmd->reject_reason = reason;
 812
 813         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 814         if (!cmd->buf_ptr) {
 815                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 816                 iscsit_free_cmd(cmd, false);
 817                 return -1;
 818         }
 819
 820         spin_lock_bh(&conn->cmd_lock);
 821         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 822         spin_unlock_bh(&conn->cmd_lock);
 823
 824         cmd->i_state = ISTATE_SEND_REJECT;
 825         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 826
 827         return -1;
 828 }
 829 EXPORT_SYMBOL(iscsit_add_reject);
 830
 831 static int iscsit_add_reject_from_cmd(
 832         struct iscsi_cmd *cmd,
 833         u8 reason,
 834         bool add_to_conn,
 835         unsigned char *buf)
 836 {
 837         struct iscsi_conn *conn;
 838         const bool do_put = cmd->se_cmd.se_tfo != NULL;
 839
 840         if (!cmd->conn) {
 841                 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
 842                                 cmd->init_task_tag);
 843                 return -1;
 844         }
 845         conn = cmd->conn;
 846
 847         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 848         cmd->reject_reason = reason;
 849
 850         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 851         if (!cmd->buf_ptr) {
 852                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 853                 iscsit_free_cmd(cmd, false);
 854                 return -1;
 855         }
 856
 857         if (add_to_conn) {
 858                 spin_lock_bh(&conn->cmd_lock);
 859                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 860                 spin_unlock_bh(&conn->cmd_lock);
 861         }
 862
 863         cmd->i_state = ISTATE_SEND_REJECT;
 864         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 865         /*
 866          * Perform the kref_put now if se_cmd has already been setup by
 867          * scsit_setup_scsi_cmd()
 868          */
 869         if (do_put) {
 870                 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
 871                 target_put_sess_cmd(&cmd->se_cmd);
 872         }
 873         return -1;
 874 }
 875
 876 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
 877                                  unsigned char *buf)
 878 {
 879         return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
 880 }
 881
 882 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
 883 {
 884         return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
 885 }
 886 EXPORT_SYMBOL(iscsit_reject_cmd);
 887
 888 /*
 889  * Map some portion of the allocated scatterlist to an iovec, suitable for
 890  * kernel sockets to copy data in/out.
 891  */
 892 static int iscsit_map_iovec(
 893         struct iscsi_cmd *cmd,
 894         struct kvec *iov,
 895         u32 data_offset,
 896         u32 data_length)
 897 {
 898         u32 i = 0;
 899         struct scatterlist *sg;
 900         unsigned int page_off;
 901
 902         /*
 903          * We know each entry in t_data_sg contains a page.
 904          */
 905         u32 ent = data_offset / PAGE_SIZE;
 906
 907         if (ent >= cmd->se_cmd.t_data_nents) {
 908                 pr_err("Initial page entry out-of-bounds\n");
 909                 return -1;
 910         }
 911
 912         sg = &cmd->se_cmd.t_data_sg[ent];
 913         page_off = (data_offset % PAGE_SIZE);
 914
 915         cmd->first_data_sg = sg;
 916         cmd->first_data_sg_off = page_off;
 917
 918         while (data_length) {
 919                 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
 920
 921                 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
 922                 iov[i].iov_len = cur_len;
 923
 924                 data_length -= cur_len;
 925                 page_off = 0;
 926                 sg = sg_next(sg);
 927                 i++;
 928         }
 929
 930         cmd->kmapped_nents = i;
 931
 932         return i;
 933 }
 934
 935 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
 936 {
 937         u32 i;
 938         struct scatterlist *sg;
 939
 940         sg = cmd->first_data_sg;
 941
 942         for (i = 0; i < cmd->kmapped_nents; i++)
 943                 kunmap(sg_page(&sg[i]));
 944 }
 945
 946 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
 947 {
 948         LIST_HEAD(ack_list);
 949         struct iscsi_cmd *cmd, *cmd_p;
 950
 951         conn->exp_statsn = exp_statsn;
 952
 953         if (conn->sess->sess_ops->RDMAExtensions)
 954                 return;
 955
 956         spin_lock_bh(&conn->cmd_lock);
 957         list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
 958                 spin_lock(&cmd->istate_lock);
 959                 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
 960                     iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
 961                         cmd->i_state = ISTATE_REMOVE;
 962                         spin_unlock(&cmd->istate_lock);
 963                         list_move_tail(&cmd->i_conn_node, &ack_list);
 964                         continue;
 965                 }
 966                 spin_unlock(&cmd->istate_lock);
 967         }
 968         spin_unlock_bh(&conn->cmd_lock);
 969
 970         list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
 971                 list_del_init(&cmd->i_conn_node);
 972                 iscsit_free_cmd(cmd, false);
 973         }
 974 }
 975
 976 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
 977 {
 978         u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
 979
 980         iov_count += ISCSI_IOV_DATA_BUFFER;
 981         cmd->iov_data = kcalloc(iov_count, sizeof(*cmd->iov_data), GFP_KERNEL);
 982         if (!cmd->iov_data)
 983                 return -ENOMEM;
 984
 985         cmd->orig_iov_data_count = iov_count;
 986         return 0;
 987 }
 988
 989 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 990                           unsigned char *buf)
 991 {
 992         int data_direction, payload_length;
 993         struct iscsi_scsi_req *hdr;
 994         int iscsi_task_attr;
 995         int sam_task_attr;
 996
 997         atomic_long_inc(&conn->sess->cmd_pdus);
 998
 999         hdr                     = (struct iscsi_scsi_req *) buf;
1000         payload_length          = ntoh24(hdr->dlength);
1001
1002         /* FIXME; Add checks for AdditionalHeaderSegment */
1003
1004         if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
1005             !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1006                 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
1007                                 " not set. Bad iSCSI Initiator.\n");
1008                 return iscsit_add_reject_cmd(cmd,
1009                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1010         }
1011
1012         if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
1013              (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
1014                 /*
1015                  * From RFC-3720 Section 10.3.1:
1016                  *
1017                  * "Either or both of R and W MAY be 1 when either the
1018                  *  Expected Data Transfer Length and/or Bidirectional Read
1019                  *  Expected Data Transfer Length are 0"
1020                  *
1021                  * For this case, go ahead and clear the unnecssary bits
1022                  * to avoid any confusion with ->data_direction.
1023                  */
1024                 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
1025                 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
1026
1027                 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
1028                         " set when Expected Data Transfer Length is 0 for"
1029                         " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
1030         }
1031
1032         if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
1033             !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
1034                 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
1035                         " MUST be set if Expected Data Transfer Length is not 0."
1036                         " Bad iSCSI Initiator\n");
1037                 return iscsit_add_reject_cmd(cmd,
1038                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1039         }
1040
1041         if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
1042             (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
1043                 pr_err("Bidirectional operations not supported!\n");
1044                 return iscsit_add_reject_cmd(cmd,
1045                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1046         }
1047
1048         if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1049                 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
1050                                 " Scsi Command PDU.\n");
1051                 return iscsit_add_reject_cmd(cmd,
1052                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1053         }
1054
1055         if (payload_length && !conn->sess->sess_ops->ImmediateData) {
1056                 pr_err("ImmediateData=No but DataSegmentLength=%u,"
1057                         " protocol error.\n", payload_length);
1058                 return iscsit_add_reject_cmd(cmd,
1059                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1060         }
1061
1062         if ((be32_to_cpu(hdr->data_length) == payload_length) &&
1063             (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
1064                 pr_err("Expected Data Transfer Length and Length of"
1065                         " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
1066                         " bit is not set protocol error\n");
1067                 return iscsit_add_reject_cmd(cmd,
1068                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1069         }
1070
1071         if (payload_length > be32_to_cpu(hdr->data_length)) {
1072                 pr_err("DataSegmentLength: %u is greater than"
1073                         " EDTL: %u, protocol error.\n", payload_length,
1074                                 hdr->data_length);
1075                 return iscsit_add_reject_cmd(cmd,
1076                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1077         }
1078
1079         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1080                 pr_err("DataSegmentLength: %u is greater than"
1081                         " MaxXmitDataSegmentLength: %u, protocol error.\n",
1082                         payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1083                 return iscsit_add_reject_cmd(cmd,
1084                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1085         }
1086
1087         if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
1088                 pr_err("DataSegmentLength: %u is greater than"
1089                         " FirstBurstLength: %u, protocol error.\n",
1090                         payload_length, conn->sess->sess_ops->FirstBurstLength);
1091                 return iscsit_add_reject_cmd(cmd,
1092                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1093         }
1094
1095         data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
1096                          (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
1097                           DMA_NONE;
1098
1099         cmd->data_direction = data_direction;
1100         iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
1101         /*
1102          * Figure out the SAM Task Attribute for the incoming SCSI CDB
1103          */
1104         if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
1105             (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
1106                 sam_task_attr = TCM_SIMPLE_TAG;
1107         else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
1108                 sam_task_attr = TCM_ORDERED_TAG;
1109         else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
1110                 sam_task_attr = TCM_HEAD_TAG;
1111         else if (iscsi_task_attr == ISCSI_ATTR_ACA)
1112                 sam_task_attr = TCM_ACA_TAG;
1113         else {
1114                 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
1115                         " TCM_SIMPLE_TAG\n", iscsi_task_attr);
1116                 sam_task_attr = TCM_SIMPLE_TAG;
1117         }
1118
1119         cmd->iscsi_opcode       = ISCSI_OP_SCSI_CMD;
1120         cmd->i_state            = ISTATE_NEW_CMD;
1121         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1122         cmd->immediate_data     = (payload_length) ? 1 : 0;
1123         cmd->unsolicited_data   = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
1124                                      (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
1125         if (cmd->unsolicited_data)
1126                 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
1127
1128         conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1129         if (hdr->flags & ISCSI_FLAG_CMD_READ)
1130                 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
1131         else
1132                 cmd->targ_xfer_tag = 0xFFFFFFFF;
1133         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1134         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1135         cmd->first_burst_len    = payload_length;
1136
1137         if (!conn->sess->sess_ops->RDMAExtensions &&
1138              cmd->data_direction == DMA_FROM_DEVICE) {
1139                 struct iscsi_datain_req *dr;
1140
1141                 dr = iscsit_allocate_datain_req();
1142                 if (!dr)
1143                         return iscsit_add_reject_cmd(cmd,
1144                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1145
1146                 iscsit_attach_datain_req(cmd, dr);
1147         }
1148
1149         /*
1150          * Initialize struct se_cmd descriptor from target_core_mod infrastructure
1151          */
1152         transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1153                         conn->sess->se_sess, be32_to_cpu(hdr->data_length),
1154                         cmd->data_direction, sam_task_attr,
1155                         cmd->sense_buffer + 2);
1156
1157         pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1158                 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
1159                 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1160                 conn->cid);
1161
1162         target_get_sess_cmd(&cmd->se_cmd, true);
1163
1164         cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
1165                                                      scsilun_to_int(&hdr->lun));
1166         if (cmd->sense_reason)
1167                 goto attach_cmd;
1168
1169         /* only used for printks or comparing with ->ref_task_tag */
1170         cmd->se_cmd.tag = (__force u32)cmd->init_task_tag;
1171         cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1172         if (cmd->sense_reason) {
1173                 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1174                         return iscsit_add_reject_cmd(cmd,
1175                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1176                 }
1177
1178                 goto attach_cmd;
1179         }
1180
1181         if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1182                 return iscsit_add_reject_cmd(cmd,
1183                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1184         }
1185
1186 attach_cmd:
1187         spin_lock_bh(&conn->cmd_lock);
1188         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1189         spin_unlock_bh(&conn->cmd_lock);
1190         /*
1191          * Check if we need to delay processing because of ALUA
1192          * Active/NonOptimized primary access state..
1193          */
1194         core_alua_check_nonop_delay(&cmd->se_cmd);
1195
1196         return 0;
1197 }
1198 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1199
1200 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1201 {
1202         iscsit_set_dataout_sequence_values(cmd);
1203
1204         spin_lock_bh(&cmd->dataout_timeout_lock);
1205         iscsit_start_dataout_timer(cmd, cmd->conn);
1206         spin_unlock_bh(&cmd->dataout_timeout_lock);
1207 }
1208 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1209
1210 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1211                             struct iscsi_scsi_req *hdr)
1212 {
1213         int cmdsn_ret = 0;
1214         /*
1215          * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1216          * the Immediate Bit is not set, and no Immediate
1217          * Data is attached.
1218          *
1219          * A PDU/CmdSN carrying Immediate Data can only
1220          * be processed after the DataCRC has passed.
1221          * If the DataCRC fails, the CmdSN MUST NOT
1222          * be acknowledged. (See below)
1223          */
1224         if (!cmd->immediate_data) {
1225                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1226                                         (unsigned char *)hdr, hdr->cmdsn);
1227                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1228                         return -1;
1229                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1230                         target_put_sess_cmd(&cmd->se_cmd);
1231                         return 0;
1232                 }
1233         }
1234
1235         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1236
1237         /*
1238          * If no Immediate Data is attached, it's OK to return now.
1239          */
1240         if (!cmd->immediate_data) {
1241                 if (!cmd->sense_reason && cmd->unsolicited_data)
1242                         iscsit_set_unsoliticed_dataout(cmd);
1243                 if (!cmd->sense_reason)
1244                         return 0;
1245
1246                 target_put_sess_cmd(&cmd->se_cmd);
1247                 return 0;
1248         }
1249
1250         /*
1251          * Early CHECK_CONDITIONs with ImmediateData never make it to command
1252          * execution.  These exceptions are processed in CmdSN order using
1253          * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1254          */
1255         if (cmd->sense_reason)
1256                 return 1;
1257         /*
1258          * Call directly into transport_generic_new_cmd() to perform
1259          * the backend memory allocation.
1260          */
1261         cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1262         if (cmd->sense_reason)
1263                 return 1;
1264
1265         return 0;
1266 }
1267 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1268
1269 static int
1270 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1271                           bool dump_payload)
1272 {
1273         int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1274         /*
1275          * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1276          */
1277         if (dump_payload)
1278                 goto after_immediate_data;
1279         /*
1280          * Check for underflow case where both EDTL and immediate data payload
1281          * exceeds what is presented by CDB's TRANSFER LENGTH, and what has
1282          * already been set in target_cmd_size_check() as se_cmd->data_length.
1283          *
1284          * For this special case, fail the command and dump the immediate data
1285          * payload.
1286          */
1287         if (cmd->first_burst_len > cmd->se_cmd.data_length) {
1288                 cmd->sense_reason = TCM_INVALID_CDB_FIELD;
1289                 goto after_immediate_data;
1290         }
1291
1292         immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1293                                         cmd->first_burst_len);
1294 after_immediate_data:
1295         if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1296                 /*
1297                  * A PDU/CmdSN carrying Immediate Data passed
1298                  * DataCRC, check against ExpCmdSN/MaxCmdSN if
1299                  * Immediate Bit is not set.
1300                  */
1301                 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1302                                         (unsigned char *)hdr, hdr->cmdsn);
1303                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1304                         return -1;
1305
1306                 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1307                         int rc;
1308
1309                         rc = iscsit_dump_data_payload(cmd->conn,
1310                                                       cmd->first_burst_len, 1);
1311                         target_put_sess_cmd(&cmd->se_cmd);
1312                         return rc;
1313                 } else if (cmd->unsolicited_data)
1314                         iscsit_set_unsoliticed_dataout(cmd);
1315
1316         } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1317                 /*
1318                  * Immediate Data failed DataCRC and ERL>=1,
1319                  * silently drop this PDU and let the initiator
1320                  * plug the CmdSN gap.
1321                  *
1322                  * FIXME: Send Unsolicited NOPIN with reserved
1323                  * TTT here to help the initiator figure out
1324                  * the missing CmdSN, although they should be
1325                  * intelligent enough to determine the missing
1326                  * CmdSN and issue a retry to plug the sequence.
1327                  */
1328                 cmd->i_state = ISTATE_REMOVE;
1329                 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1330         } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1331                 return -1;
1332
1333         return 0;
1334 }
1335
1336 static int
1337 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1338                            unsigned char *buf)
1339 {
1340         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1341         int rc, immed_data;
1342         bool dump_payload = false;
1343
1344         rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1345         if (rc < 0)
1346                 return 0;
1347         /*
1348          * Allocation iovecs needed for struct socket operations for
1349          * traditional iSCSI block I/O.
1350          */
1351         if (iscsit_allocate_iovecs(cmd) < 0) {
1352                 return iscsit_reject_cmd(cmd,
1353                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1354         }
1355         immed_data = cmd->immediate_data;
1356
1357         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1358         if (rc < 0)
1359                 return rc;
1360         else if (rc > 0)
1361                 dump_payload = true;
1362
1363         if (!immed_data)
1364                 return 0;
1365
1366         return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1367 }
1368
1369 static u32 iscsit_do_crypto_hash_sg(
1370         struct ahash_request *hash,
1371         struct iscsi_cmd *cmd,
1372         u32 data_offset,
1373         u32 data_length,
1374         u32 padding,
1375         u8 *pad_bytes)
1376 {
1377         u32 data_crc;
1378         struct scatterlist *sg;
1379         unsigned int page_off;
1380
1381         crypto_ahash_init(hash);
1382
1383         sg = cmd->first_data_sg;
1384         page_off = cmd->first_data_sg_off;
1385
1386         while (data_length) {
1387                 u32 cur_len = min_t(u32, data_length, (sg->length - page_off));
1388
1389                 ahash_request_set_crypt(hash, sg, NULL, cur_len);
1390                 crypto_ahash_update(hash);
1391
1392                 data_length -= cur_len;
1393                 page_off = 0;
1394                 /* iscsit_map_iovec has already checked for invalid sg pointers */
1395                 sg = sg_next(sg);
1396         }
1397
1398         if (padding) {
1399                 struct scatterlist pad_sg;
1400
1401                 sg_init_one(&pad_sg, pad_bytes, padding);
1402                 ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc,
1403                                         padding);
1404                 crypto_ahash_finup(hash);
1405         } else {
1406                 ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0);
1407                 crypto_ahash_final(hash);
1408         }
1409
1410         return data_crc;
1411 }
1412
1413 static void iscsit_do_crypto_hash_buf(struct ahash_request *hash,
1414         const void *buf, u32 payload_length, u32 padding,
1415         const void *pad_bytes, void *data_crc)
1416 {
1417         struct scatterlist sg[2];
1418
1419         sg_init_table(sg, ARRAY_SIZE(sg));
1420         sg_set_buf(sg, buf, payload_length);
1421         sg_set_buf(sg + 1, pad_bytes, padding);
1422
1423         ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding);
1424
1425         crypto_ahash_digest(hash);
1426 }
1427
1428 int
1429 __iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1430                            struct iscsi_cmd *cmd, u32 payload_length,
1431                            bool *success)
1432 {
1433         struct iscsi_data *hdr = buf;
1434         struct se_cmd *se_cmd;
1435         int rc;
1436
1437         /* iSCSI write */
1438         atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1439
1440         pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1441                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1442                 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1443                 payload_length, conn->cid);
1444
1445         if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1446                 pr_err("Command ITT: 0x%08x received DataOUT after"
1447                         " last DataOUT received, dumping payload\n",
1448                         cmd->init_task_tag);
1449                 return iscsit_dump_data_payload(conn, payload_length, 1);
1450         }
1451
1452         if (cmd->data_direction != DMA_TO_DEVICE) {
1453                 pr_err("Command ITT: 0x%08x received DataOUT for a"
1454                         " NON-WRITE command.\n", cmd->init_task_tag);
1455                 return iscsit_dump_data_payload(conn, payload_length, 1);
1456         }
1457         se_cmd = &cmd->se_cmd;
1458         iscsit_mod_dataout_timer(cmd);
1459
1460         if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1461                 pr_err("DataOut Offset: %u, Length %u greater than iSCSI Command EDTL %u, protocol error.\n",
1462                        be32_to_cpu(hdr->offset), payload_length,
1463                        cmd->se_cmd.data_length);
1464                 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1465         }
1466
1467         if (cmd->unsolicited_data) {
1468                 int dump_unsolicited_data = 0;
1469
1470                 if (conn->sess->sess_ops->InitialR2T) {
1471                         pr_err("Received unexpected unsolicited data"
1472                                 " while InitialR2T=Yes, protocol error.\n");
1473                         transport_send_check_condition_and_sense(&cmd->se_cmd,
1474                                         TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1475                         return -1;
1476                 }
1477                 /*
1478                  * Special case for dealing with Unsolicited DataOUT
1479                  * and Unsupported SAM WRITE Opcodes and SE resource allocation
1480                  * failures;
1481                  */
1482
1483                 /* Something's amiss if we're not in WRITE_PENDING state... */
1484                 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1485                 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1486                         dump_unsolicited_data = 1;
1487
1488                 if (dump_unsolicited_data) {
1489                         /*
1490                          * Check if a delayed TASK_ABORTED status needs to
1491                          * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1492                          * received with the unsolicited data out.
1493                          */
1494                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1495                                 iscsit_stop_dataout_timer(cmd);
1496
1497                         transport_check_aborted_status(se_cmd,
1498                                         (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1499                         return iscsit_dump_data_payload(conn, payload_length, 1);
1500                 }
1501         } else {
1502                 /*
1503                  * For the normal solicited data path:
1504                  *
1505                  * Check for a delayed TASK_ABORTED status and dump any
1506                  * incoming data out payload if one exists.  Also, when the
1507                  * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1508                  * data out sequence, we decrement outstanding_r2ts.  Once
1509                  * outstanding_r2ts reaches zero, go ahead and send the delayed
1510                  * TASK_ABORTED status.
1511                  */
1512                 if (se_cmd->transport_state & CMD_T_ABORTED) {
1513                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1514                                 if (--cmd->outstanding_r2ts < 1) {
1515                                         iscsit_stop_dataout_timer(cmd);
1516                                         transport_check_aborted_status(
1517                                                         se_cmd, 1);
1518                                 }
1519
1520                         return iscsit_dump_data_payload(conn, payload_length, 1);
1521                 }
1522         }
1523         /*
1524          * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1525          * within-command recovery checks before receiving the payload.
1526          */
1527         rc = iscsit_check_pre_dataout(cmd, buf);
1528         if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1529                 return 0;
1530         else if (rc == DATAOUT_CANNOT_RECOVER)
1531                 return -1;
1532         *success = true;
1533         return 0;
1534 }
1535 EXPORT_SYMBOL(__iscsit_check_dataout_hdr);
1536
1537 int
1538 iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1539                          struct iscsi_cmd **out_cmd)
1540 {
1541         struct iscsi_data *hdr = buf;
1542         struct iscsi_cmd *cmd;
1543         u32 payload_length = ntoh24(hdr->dlength);
1544         int rc;
1545         bool success = false;
1546
1547         if (!payload_length) {
1548                 pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n");
1549                 return 0;
1550         }
1551
1552         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1553                 pr_err_ratelimited("DataSegmentLength: %u is greater than"
1554                         " MaxXmitDataSegmentLength: %u\n", payload_length,
1555                         conn->conn_ops->MaxXmitDataSegmentLength);
1556                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf);
1557         }
1558
1559         cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, payload_length);
1560         if (!cmd)
1561                 return 0;
1562
1563         rc = __iscsit_check_dataout_hdr(conn, buf, cmd, payload_length, &success);
1564
1565         if (success)
1566                 *out_cmd = cmd;
1567
1568         return rc;
1569 }
1570 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1571
1572 static int
1573 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1574                    struct iscsi_data *hdr)
1575 {
1576         struct kvec *iov;
1577         u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1578         u32 payload_length = ntoh24(hdr->dlength);
1579         int iov_ret, data_crc_failed = 0;
1580
1581         rx_size += payload_length;
1582         iov = &cmd->iov_data[0];
1583
1584         iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1585                                    payload_length);
1586         if (iov_ret < 0)
1587                 return -1;
1588
1589         iov_count += iov_ret;
1590
1591         padding = ((-payload_length) & 3);
1592         if (padding != 0) {
1593                 iov[iov_count].iov_base = cmd->pad_bytes;
1594                 iov[iov_count++].iov_len = padding;
1595                 rx_size += padding;
1596                 pr_debug("Receiving %u padding bytes.\n", padding);
1597         }
1598
1599         if (conn->conn_ops->DataDigest) {
1600                 iov[iov_count].iov_base = &checksum;
1601                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1602                 rx_size += ISCSI_CRC_LEN;
1603         }
1604
1605         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1606
1607         iscsit_unmap_iovec(cmd);
1608
1609         if (rx_got != rx_size)
1610                 return -1;
1611
1612         if (conn->conn_ops->DataDigest) {
1613                 u32 data_crc;
1614
1615                 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
1616                                                     be32_to_cpu(hdr->offset),
1617                                                     payload_length, padding,
1618                                                     cmd->pad_bytes);
1619
1620                 if (checksum != data_crc) {
1621                         pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1622                                 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1623                                 " does not match computed 0x%08x\n",
1624                                 hdr->itt, hdr->offset, payload_length,
1625                                 hdr->datasn, checksum, data_crc);
1626                         data_crc_failed = 1;
1627                 } else {
1628                         pr_debug("Got CRC32C DataDigest 0x%08x for"
1629                                 " %u bytes of Data Out\n", checksum,
1630                                 payload_length);
1631                 }
1632         }
1633
1634         return data_crc_failed;
1635 }
1636
1637 int
1638 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1639                              bool data_crc_failed)
1640 {
1641         struct iscsi_conn *conn = cmd->conn;
1642         int rc, ooo_cmdsn;
1643         /*
1644          * Increment post receive data and CRC values or perform
1645          * within-command recovery.
1646          */
1647         rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1648         if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1649                 return 0;
1650         else if (rc == DATAOUT_SEND_R2T) {
1651                 iscsit_set_dataout_sequence_values(cmd);
1652                 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1653         } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1654                 /*
1655                  * Handle extra special case for out of order
1656                  * Unsolicited Data Out.
1657                  */
1658                 spin_lock_bh(&cmd->istate_lock);
1659                 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1660                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1661                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1662                 spin_unlock_bh(&cmd->istate_lock);
1663
1664                 iscsit_stop_dataout_timer(cmd);
1665                 if (ooo_cmdsn)
1666                         return 0;
1667                 target_execute_cmd(&cmd->se_cmd);
1668                 return 0;
1669         } else /* DATAOUT_CANNOT_RECOVER */
1670                 return -1;
1671
1672         return 0;
1673 }
1674 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1675
1676 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1677 {
1678         struct iscsi_cmd *cmd = NULL;
1679         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1680         int rc;
1681         bool data_crc_failed = false;
1682
1683         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1684         if (rc < 0)
1685                 return 0;
1686         else if (!cmd)
1687                 return 0;
1688
1689         rc = iscsit_get_dataout(conn, cmd, hdr);
1690         if (rc < 0)
1691                 return rc;
1692         else if (rc > 0)
1693                 data_crc_failed = true;
1694
1695         return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1696 }
1697
1698 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1699                          struct iscsi_nopout *hdr)
1700 {
1701         u32 payload_length = ntoh24(hdr->dlength);
1702
1703         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1704                 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1705                 if (!cmd)
1706                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1707                                                  (unsigned char *)hdr);
1708
1709                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1710                                          (unsigned char *)hdr);
1711         }
1712
1713         if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1714                 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1715                         " not set, protocol error.\n");
1716                 if (!cmd)
1717                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1718                                                  (unsigned char *)hdr);
1719
1720                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1721                                          (unsigned char *)hdr);
1722         }
1723
1724         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1725                 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1726                         " greater than MaxXmitDataSegmentLength: %u, protocol"
1727                         " error.\n", payload_length,
1728                         conn->conn_ops->MaxXmitDataSegmentLength);
1729                 if (!cmd)
1730                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1731                                                  (unsigned char *)hdr);
1732
1733                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1734                                          (unsigned char *)hdr);
1735         }
1736
1737         pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1738                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1739                 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1740                 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1741                 payload_length);
1742         /*
1743          * This is not a response to a Unsolicited NopIN, which means
1744          * it can either be a NOPOUT ping request (with a valid ITT),
1745          * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1746          * Either way, make sure we allocate an struct iscsi_cmd, as both
1747          * can contain ping data.
1748          */
1749         if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1750                 cmd->iscsi_opcode       = ISCSI_OP_NOOP_OUT;
1751                 cmd->i_state            = ISTATE_SEND_NOPIN;
1752                 cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1753                                                 1 : 0);
1754                 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1755                 cmd->targ_xfer_tag      = 0xFFFFFFFF;
1756                 cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1757                 cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1758                 cmd->data_direction     = DMA_NONE;
1759         }
1760
1761         return 0;
1762 }
1763 EXPORT_SYMBOL(iscsit_setup_nop_out);
1764
1765 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1766                            struct iscsi_nopout *hdr)
1767 {
1768         struct iscsi_cmd *cmd_p = NULL;
1769         int cmdsn_ret = 0;
1770         /*
1771          * Initiator is expecting a NopIN ping reply..
1772          */
1773         if (hdr->itt != RESERVED_ITT) {
1774                 if (!cmd)
1775                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1776                                                 (unsigned char *)hdr);
1777
1778                 spin_lock_bh(&conn->cmd_lock);
1779                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1780                 spin_unlock_bh(&conn->cmd_lock);
1781
1782                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1783
1784                 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1785                         iscsit_add_cmd_to_response_queue(cmd, conn,
1786                                                          cmd->i_state);
1787                         return 0;
1788                 }
1789
1790                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1791                                 (unsigned char *)hdr, hdr->cmdsn);
1792                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1793                         return 0;
1794                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1795                         return -1;
1796
1797                 return 0;
1798         }
1799         /*
1800          * This was a response to a unsolicited NOPIN ping.
1801          */
1802         if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1803                 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1804                 if (!cmd_p)
1805                         return -EINVAL;
1806
1807                 iscsit_stop_nopin_response_timer(conn);
1808
1809                 cmd_p->i_state = ISTATE_REMOVE;
1810                 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1811
1812                 iscsit_start_nopin_timer(conn);
1813                 return 0;
1814         }
1815         /*
1816          * Otherwise, initiator is not expecting a NOPIN is response.
1817          * Just ignore for now.
1818          */
1819
1820         if (cmd)
1821                 iscsit_free_cmd(cmd, false);
1822
1823         return 0;
1824 }
1825 EXPORT_SYMBOL(iscsit_process_nop_out);
1826
1827 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1828                                  unsigned char *buf)
1829 {
1830         unsigned char *ping_data = NULL;
1831         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1832         struct kvec *iov = NULL;
1833         u32 payload_length = ntoh24(hdr->dlength);
1834         int ret;
1835
1836         ret = iscsit_setup_nop_out(conn, cmd, hdr);
1837         if (ret < 0)
1838                 return 0;
1839         /*
1840          * Handle NOP-OUT payload for traditional iSCSI sockets
1841          */
1842         if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1843                 u32 checksum, data_crc, padding = 0;
1844                 int niov = 0, rx_got, rx_size = payload_length;
1845
1846                 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1847                 if (!ping_data) {
1848                         ret = -1;
1849                         goto out;
1850                 }
1851
1852                 iov = &cmd->iov_misc[0];
1853                 iov[niov].iov_base      = ping_data;
1854                 iov[niov++].iov_len     = payload_length;
1855
1856                 padding = ((-payload_length) & 3);
1857                 if (padding != 0) {
1858                         pr_debug("Receiving %u additional bytes"
1859                                 " for padding.\n", padding);
1860                         iov[niov].iov_base      = &cmd->pad_bytes;
1861                         iov[niov++].iov_len     = padding;
1862                         rx_size += padding;
1863                 }
1864                 if (conn->conn_ops->DataDigest) {
1865                         iov[niov].iov_base      = &checksum;
1866                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
1867                         rx_size += ISCSI_CRC_LEN;
1868                 }
1869
1870                 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1871                 if (rx_got != rx_size) {
1872                         ret = -1;
1873                         goto out;
1874                 }
1875
1876                 if (conn->conn_ops->DataDigest) {
1877                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash, ping_data,
1878                                                   payload_length, padding,
1879                                                   cmd->pad_bytes, &data_crc);
1880
1881                         if (checksum != data_crc) {
1882                                 pr_err("Ping data CRC32C DataDigest"
1883                                 " 0x%08x does not match computed 0x%08x\n",
1884                                         checksum, data_crc);
1885                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1886                                         pr_err("Unable to recover from"
1887                                         " NOPOUT Ping DataCRC failure while in"
1888                                                 " ERL=0.\n");
1889                                         ret = -1;
1890                                         goto out;
1891                                 } else {
1892                                         /*
1893                                          * Silently drop this PDU and let the
1894                                          * initiator plug the CmdSN gap.
1895                                          */
1896                                         pr_debug("Dropping NOPOUT"
1897                                         " Command CmdSN: 0x%08x due to"
1898                                         " DataCRC error.\n", hdr->cmdsn);
1899                                         ret = 0;
1900                                         goto out;
1901                                 }
1902                         } else {
1903                                 pr_debug("Got CRC32C DataDigest"
1904                                 " 0x%08x for %u bytes of ping data.\n",
1905                                         checksum, payload_length);
1906                         }
1907                 }
1908
1909                 ping_data[payload_length] = '\0';
1910                 /*
1911                  * Attach ping data to struct iscsi_cmd->buf_ptr.
1912                  */
1913                 cmd->buf_ptr = ping_data;
1914                 cmd->buf_ptr_size = payload_length;
1915
1916                 pr_debug("Got %u bytes of NOPOUT ping"
1917                         " data.\n", payload_length);
1918                 pr_debug("Ping Data: \"%s\"\n", ping_data);
1919         }
1920
1921         return iscsit_process_nop_out(conn, cmd, hdr);
1922 out:
1923         if (cmd)
1924                 iscsit_free_cmd(cmd, false);
1925
1926         kfree(ping_data);
1927         return ret;
1928 }
1929
1930 static enum tcm_tmreq_table iscsit_convert_tmf(u8 iscsi_tmf)
1931 {
1932         switch (iscsi_tmf) {
1933         case ISCSI_TM_FUNC_ABORT_TASK:
1934                 return TMR_ABORT_TASK;
1935         case ISCSI_TM_FUNC_ABORT_TASK_SET:
1936                 return TMR_ABORT_TASK_SET;
1937         case ISCSI_TM_FUNC_CLEAR_ACA:
1938                 return TMR_CLEAR_ACA;
1939         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1940                 return TMR_CLEAR_TASK_SET;
1941         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1942                 return TMR_LUN_RESET;
1943         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1944                 return TMR_TARGET_WARM_RESET;
1945         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1946                 return TMR_TARGET_COLD_RESET;
1947         default:
1948                 return TMR_UNKNOWN;
1949         }
1950 }
1951
1952 int
1953 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1954                            unsigned char *buf)
1955 {
1956         struct se_tmr_req *se_tmr;
1957         struct iscsi_tmr_req *tmr_req;
1958         struct iscsi_tm *hdr;
1959         int out_of_order_cmdsn = 0, ret;
1960         u8 function, tcm_function = TMR_UNKNOWN;
1961
1962         hdr                     = (struct iscsi_tm *) buf;
1963         hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1964         function = hdr->flags;
1965
1966         pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1967                 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1968                 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1969                 hdr->rtt, hdr->refcmdsn, conn->cid);
1970
1971         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1972             ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1973              hdr->rtt != RESERVED_ITT)) {
1974                 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1975                 hdr->rtt = RESERVED_ITT;
1976         }
1977
1978         if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1979                         !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1980                 pr_err("Task Management Request TASK_REASSIGN not"
1981                         " issued as immediate command, bad iSCSI Initiator"
1982                                 "implementation\n");
1983                 return iscsit_add_reject_cmd(cmd,
1984                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1985         }
1986         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1987             be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1988                 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1989
1990         cmd->data_direction = DMA_NONE;
1991         cmd->tmr_req = kzalloc(sizeof(*cmd->tmr_req), GFP_KERNEL);
1992         if (!cmd->tmr_req) {
1993                 return iscsit_add_reject_cmd(cmd,
1994                                              ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1995                                              buf);
1996         }
1997
1998         transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1999                               conn->sess->se_sess, 0, DMA_NONE,
2000                               TCM_SIMPLE_TAG, cmd->sense_buffer + 2);
2001
2002         target_get_sess_cmd(&cmd->se_cmd, true);
2003
2004         /*
2005          * TASK_REASSIGN for ERL=2 / connection stays inside of
2006          * LIO-Target $FABRIC_MOD
2007          */
2008         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2009                 tcm_function = iscsit_convert_tmf(function);
2010                 if (tcm_function == TMR_UNKNOWN) {
2011                         pr_err("Unknown iSCSI TMR Function:"
2012                                " 0x%02x\n", function);
2013                         return iscsit_add_reject_cmd(cmd,
2014                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2015                 }
2016         }
2017         ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function,
2018                                  GFP_KERNEL);
2019         if (ret < 0)
2020                 return iscsit_add_reject_cmd(cmd,
2021                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2022
2023         cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
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                         target_put_sess_cmd(&cmd->se_cmd);
2103                         return 0;
2104                 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2105                         return -1;
2106                 }
2107         }
2108         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2109
2110         if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
2111                 return 0;
2112         /*
2113          * Found the referenced task, send to transport for processing.
2114          */
2115         if (se_tmr->call_transport)
2116                 return transport_generic_handle_tmr(&cmd->se_cmd);
2117
2118         /*
2119          * Could not find the referenced LUN, task, or Task Management
2120          * command not authorized or supported.  Change state and
2121          * let the tx_thread send the response.
2122          *
2123          * For connection recovery, this is also the default action for
2124          * TMR TASK_REASSIGN.
2125          */
2126         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2127         target_put_sess_cmd(&cmd->se_cmd);
2128         return 0;
2129 }
2130 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
2131
2132 /* #warning FIXME: Support Text Command parameters besides SendTargets */
2133 int
2134 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2135                       struct iscsi_text *hdr)
2136 {
2137         u32 payload_length = ntoh24(hdr->dlength);
2138
2139         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
2140                 pr_err("Unable to accept text parameter length: %u"
2141                         "greater than MaxXmitDataSegmentLength %u.\n",
2142                        payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
2143                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2144                                          (unsigned char *)hdr);
2145         }
2146
2147         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
2148              (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
2149                 pr_err("Multi sequence text commands currently not supported\n");
2150                 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
2151                                         (unsigned char *)hdr);
2152         }
2153
2154         pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
2155                 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
2156                 hdr->exp_statsn, payload_length);
2157
2158         cmd->iscsi_opcode       = ISCSI_OP_TEXT;
2159         cmd->i_state            = ISTATE_SEND_TEXTRSP;
2160         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2161         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2162         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2163         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2164         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2165         cmd->data_direction     = DMA_NONE;
2166         kfree(cmd->text_in_ptr);
2167         cmd->text_in_ptr        = NULL;
2168
2169         return 0;
2170 }
2171 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2172
2173 int
2174 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2175                         struct iscsi_text *hdr)
2176 {
2177         unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2178         int cmdsn_ret;
2179
2180         if (!text_in) {
2181                 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2182                 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2183                         pr_err("Unable to locate text_in buffer for sendtargets"
2184                                " discovery\n");
2185                         goto reject;
2186                 }
2187                 goto empty_sendtargets;
2188         }
2189         if (strncmp("SendTargets", text_in, 11) != 0) {
2190                 pr_err("Received Text Data that is not"
2191                         " SendTargets, cannot continue.\n");
2192                 goto reject;
2193         }
2194         text_ptr = strchr(text_in, '=');
2195         if (!text_ptr) {
2196                 pr_err("No \"=\" separator found in Text Data,"
2197                         "  cannot continue.\n");
2198                 goto reject;
2199         }
2200         if (!strncmp("=All", text_ptr, 4)) {
2201                 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2202         } else if (!strncmp("=iqn.", text_ptr, 5) ||
2203                    !strncmp("=eui.", text_ptr, 5)) {
2204                 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2205         } else {
2206                 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2207                 goto reject;
2208         }
2209
2210         spin_lock_bh(&conn->cmd_lock);
2211         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2212         spin_unlock_bh(&conn->cmd_lock);
2213
2214 empty_sendtargets:
2215         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2216
2217         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2218                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2219                                 (unsigned char *)hdr, hdr->cmdsn);
2220                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2221                         return -1;
2222
2223                 return 0;
2224         }
2225
2226         return iscsit_execute_cmd(cmd, 0);
2227
2228 reject:
2229         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2230                                  (unsigned char *)hdr);
2231 }
2232 EXPORT_SYMBOL(iscsit_process_text_cmd);
2233
2234 static int
2235 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2236                        unsigned char *buf)
2237 {
2238         struct iscsi_text *hdr = (struct iscsi_text *)buf;
2239         char *text_in = NULL;
2240         u32 payload_length = ntoh24(hdr->dlength);
2241         int rx_size, rc;
2242
2243         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2244         if (rc < 0)
2245                 return 0;
2246
2247         rx_size = payload_length;
2248         if (payload_length) {
2249                 u32 checksum = 0, data_crc = 0;
2250                 u32 padding = 0, pad_bytes = 0;
2251                 int niov = 0, rx_got;
2252                 struct kvec iov[3];
2253
2254                 text_in = kzalloc(payload_length, GFP_KERNEL);
2255                 if (!text_in)
2256                         goto reject;
2257
2258                 cmd->text_in_ptr = text_in;
2259
2260                 memset(iov, 0, 3 * sizeof(struct kvec));
2261                 iov[niov].iov_base      = text_in;
2262                 iov[niov++].iov_len     = payload_length;
2263
2264                 padding = ((-payload_length) & 3);
2265                 if (padding != 0) {
2266                         iov[niov].iov_base = &pad_bytes;
2267                         iov[niov++].iov_len  = padding;
2268                         rx_size += padding;
2269                         pr_debug("Receiving %u additional bytes"
2270                                         " for padding.\n", padding);
2271                 }
2272                 if (conn->conn_ops->DataDigest) {
2273                         iov[niov].iov_base      = &checksum;
2274                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
2275                         rx_size += ISCSI_CRC_LEN;
2276                 }
2277
2278                 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2279                 if (rx_got != rx_size)
2280                         goto reject;
2281
2282                 if (conn->conn_ops->DataDigest) {
2283                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash, text_in,
2284                                                   payload_length, padding,
2285                                                   &pad_bytes, &data_crc);
2286
2287                         if (checksum != data_crc) {
2288                                 pr_err("Text data CRC32C DataDigest"
2289                                         " 0x%08x does not match computed"
2290                                         " 0x%08x\n", checksum, data_crc);
2291                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2292                                         pr_err("Unable to recover from"
2293                                         " Text Data digest failure while in"
2294                                                 " ERL=0.\n");
2295                                         goto reject;
2296                                 } else {
2297                                         /*
2298                                          * Silently drop this PDU and let the
2299                                          * initiator plug the CmdSN gap.
2300                                          */
2301                                         pr_debug("Dropping Text"
2302                                         " Command CmdSN: 0x%08x due to"
2303                                         " DataCRC error.\n", hdr->cmdsn);
2304                                         kfree(text_in);
2305                                         return 0;
2306                                 }
2307                         } else {
2308                                 pr_debug("Got CRC32C DataDigest"
2309                                         " 0x%08x for %u bytes of text data.\n",
2310                                                 checksum, payload_length);
2311                         }
2312                 }
2313                 text_in[payload_length - 1] = '\0';
2314                 pr_debug("Successfully read %d bytes of text"
2315                                 " data.\n", payload_length);
2316         }
2317
2318         return iscsit_process_text_cmd(conn, cmd, hdr);
2319
2320 reject:
2321         kfree(cmd->text_in_ptr);
2322         cmd->text_in_ptr = NULL;
2323         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2324 }
2325
2326 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2327 {
2328         struct iscsi_conn *conn_p;
2329         struct iscsi_session *sess = conn->sess;
2330
2331         pr_debug("Received logout request CLOSESESSION on CID: %hu"
2332                 " for SID: %u.\n", conn->cid, conn->sess->sid);
2333
2334         atomic_set(&sess->session_logout, 1);
2335         atomic_set(&conn->conn_logout_remove, 1);
2336         conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2337
2338         iscsit_inc_conn_usage_count(conn);
2339         iscsit_inc_session_usage_count(sess);
2340
2341         spin_lock_bh(&sess->conn_lock);
2342         list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2343                 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2344                         continue;
2345
2346                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2347                 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2348         }
2349         spin_unlock_bh(&sess->conn_lock);
2350
2351         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2352
2353         return 0;
2354 }
2355
2356 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2357 {
2358         struct iscsi_conn *l_conn;
2359         struct iscsi_session *sess = conn->sess;
2360
2361         pr_debug("Received logout request CLOSECONNECTION for CID:"
2362                 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2363
2364         /*
2365          * A Logout Request with a CLOSECONNECTION reason code for a CID
2366          * can arrive on a connection with a differing CID.
2367          */
2368         if (conn->cid == cmd->logout_cid) {
2369                 spin_lock_bh(&conn->state_lock);
2370                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2371                 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2372
2373                 atomic_set(&conn->conn_logout_remove, 1);
2374                 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2375                 iscsit_inc_conn_usage_count(conn);
2376
2377                 spin_unlock_bh(&conn->state_lock);
2378         } else {
2379                 /*
2380                  * Handle all different cid CLOSECONNECTION requests in
2381                  * iscsit_logout_post_handler_diffcid() as to give enough
2382                  * time for any non immediate command's CmdSN to be
2383                  * acknowledged on the connection in question.
2384                  *
2385                  * Here we simply make sure the CID is still around.
2386                  */
2387                 l_conn = iscsit_get_conn_from_cid(sess,
2388                                 cmd->logout_cid);
2389                 if (!l_conn) {
2390                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2391                         iscsit_add_cmd_to_response_queue(cmd, conn,
2392                                         cmd->i_state);
2393                         return 0;
2394                 }
2395
2396                 iscsit_dec_conn_usage_count(l_conn);
2397         }
2398
2399         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2400
2401         return 0;
2402 }
2403
2404 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2405 {
2406         struct iscsi_session *sess = conn->sess;
2407
2408         pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2409                 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2410
2411         if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2412                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2413                         " while ERL!=2.\n");
2414                 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2415                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2416                 return 0;
2417         }
2418
2419         if (conn->cid == cmd->logout_cid) {
2420                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2421                         " with CID: %hu on CID: %hu, implementation error.\n",
2422                                 cmd->logout_cid, conn->cid);
2423                 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2424                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2425                 return 0;
2426         }
2427
2428         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2429
2430         return 0;
2431 }
2432
2433 int
2434 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2435                         unsigned char *buf)
2436 {
2437         int cmdsn_ret, logout_remove = 0;
2438         u8 reason_code = 0;
2439         struct iscsi_logout *hdr;
2440         struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2441
2442         hdr                     = (struct iscsi_logout *) buf;
2443         reason_code             = (hdr->flags & 0x7f);
2444
2445         if (tiqn) {
2446                 spin_lock(&tiqn->logout_stats.lock);
2447                 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2448                         tiqn->logout_stats.normal_logouts++;
2449                 else
2450                         tiqn->logout_stats.abnormal_logouts++;
2451                 spin_unlock(&tiqn->logout_stats.lock);
2452         }
2453
2454         pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2455                 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2456                 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2457                 hdr->cid, conn->cid);
2458
2459         if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2460                 pr_err("Received logout request on connection that"
2461                         " is not in logged in state, ignoring request.\n");
2462                 iscsit_free_cmd(cmd, false);
2463                 return 0;
2464         }
2465
2466         cmd->iscsi_opcode       = ISCSI_OP_LOGOUT;
2467         cmd->i_state            = ISTATE_SEND_LOGOUTRSP;
2468         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2469         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2470         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2471         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2472         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2473         cmd->logout_cid         = be16_to_cpu(hdr->cid);
2474         cmd->logout_reason      = reason_code;
2475         cmd->data_direction     = DMA_NONE;
2476
2477         /*
2478          * We need to sleep in these cases (by returning 1) until the Logout
2479          * Response gets sent in the tx thread.
2480          */
2481         if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2482            ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2483             be16_to_cpu(hdr->cid) == conn->cid))
2484                 logout_remove = 1;
2485
2486         spin_lock_bh(&conn->cmd_lock);
2487         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2488         spin_unlock_bh(&conn->cmd_lock);
2489
2490         if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2491                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2492
2493         /*
2494          * Immediate commands are executed, well, immediately.
2495          * Non-Immediate Logout Commands are executed in CmdSN order.
2496          */
2497         if (cmd->immediate_cmd) {
2498                 int ret = iscsit_execute_cmd(cmd, 0);
2499
2500                 if (ret < 0)
2501                         return ret;
2502         } else {
2503                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2504                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2505                         logout_remove = 0;
2506                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2507                         return -1;
2508         }
2509
2510         return logout_remove;
2511 }
2512 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2513
2514 int iscsit_handle_snack(
2515         struct iscsi_conn *conn,
2516         unsigned char *buf)
2517 {
2518         struct iscsi_snack *hdr;
2519
2520         hdr                     = (struct iscsi_snack *) buf;
2521         hdr->flags              &= ~ISCSI_FLAG_CMD_FINAL;
2522
2523         pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2524                 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2525                 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2526                         hdr->begrun, hdr->runlength, conn->cid);
2527
2528         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2529                 pr_err("Initiator sent SNACK request while in"
2530                         " ErrorRecoveryLevel=0.\n");
2531                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2532                                          buf);
2533         }
2534         /*
2535          * SNACK_DATA and SNACK_R2T are both 0,  so check which function to
2536          * call from inside iscsi_send_recovery_datain_or_r2t().
2537          */
2538         switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2539         case 0:
2540                 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2541                         hdr->itt,
2542                         be32_to_cpu(hdr->ttt),
2543                         be32_to_cpu(hdr->begrun),
2544                         be32_to_cpu(hdr->runlength));
2545         case ISCSI_FLAG_SNACK_TYPE_STATUS:
2546                 return iscsit_handle_status_snack(conn, hdr->itt,
2547                         be32_to_cpu(hdr->ttt),
2548                         be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2549         case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2550                 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2551                         be32_to_cpu(hdr->begrun),
2552                         be32_to_cpu(hdr->runlength));
2553         case ISCSI_FLAG_SNACK_TYPE_RDATA:
2554                 /* FIXME: Support R-Data SNACK */
2555                 pr_err("R-Data SNACK Not Supported.\n");
2556                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2557                                          buf);
2558         default:
2559                 pr_err("Unknown SNACK type 0x%02x, protocol"
2560                         " error.\n", hdr->flags & 0x0f);
2561                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2562                                          buf);
2563         }
2564
2565         return 0;
2566 }
2567 EXPORT_SYMBOL(iscsit_handle_snack);
2568
2569 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2570 {
2571         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2572             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2573                 wait_for_completion_interruptible_timeout(
2574                                         &conn->rx_half_close_comp,
2575                                         ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2576         }
2577 }
2578
2579 static int iscsit_handle_immediate_data(
2580         struct iscsi_cmd *cmd,
2581         struct iscsi_scsi_req *hdr,
2582         u32 length)
2583 {
2584         int iov_ret, rx_got = 0, rx_size = 0;
2585         u32 checksum, iov_count = 0, padding = 0;
2586         struct iscsi_conn *conn = cmd->conn;
2587         struct kvec *iov;
2588
2589         iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2590         if (iov_ret < 0)
2591                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2592
2593         rx_size = length;
2594         iov_count = iov_ret;
2595         iov = &cmd->iov_data[0];
2596
2597         padding = ((-length) & 3);
2598         if (padding != 0) {
2599                 iov[iov_count].iov_base = cmd->pad_bytes;
2600                 iov[iov_count++].iov_len = padding;
2601                 rx_size += padding;
2602         }
2603
2604         if (conn->conn_ops->DataDigest) {
2605                 iov[iov_count].iov_base         = &checksum;
2606                 iov[iov_count++].iov_len        = ISCSI_CRC_LEN;
2607                 rx_size += ISCSI_CRC_LEN;
2608         }
2609
2610         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2611
2612         iscsit_unmap_iovec(cmd);
2613
2614         if (rx_got != rx_size) {
2615                 iscsit_rx_thread_wait_for_tcp(conn);
2616                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2617         }
2618
2619         if (conn->conn_ops->DataDigest) {
2620                 u32 data_crc;
2621
2622                 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
2623                                                     cmd->write_data_done, length, padding,
2624                                                     cmd->pad_bytes);
2625
2626                 if (checksum != data_crc) {
2627                         pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2628                                 " does not match computed 0x%08x\n", checksum,
2629                                 data_crc);
2630
2631                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2632                                 pr_err("Unable to recover from"
2633                                         " Immediate Data digest failure while"
2634                                         " in ERL=0.\n");
2635                                 iscsit_reject_cmd(cmd,
2636                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2637                                                 (unsigned char *)hdr);
2638                                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2639                         } else {
2640                                 iscsit_reject_cmd(cmd,
2641                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2642                                                 (unsigned char *)hdr);
2643                                 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2644                         }
2645                 } else {
2646                         pr_debug("Got CRC32C DataDigest 0x%08x for"
2647                                 " %u bytes of Immediate Data\n", checksum,
2648                                 length);
2649                 }
2650         }
2651
2652         cmd->write_data_done += length;
2653
2654         if (cmd->write_data_done == cmd->se_cmd.data_length) {
2655                 spin_lock_bh(&cmd->istate_lock);
2656                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2657                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2658                 spin_unlock_bh(&cmd->istate_lock);
2659         }
2660
2661         return IMMEDIATE_DATA_NORMAL_OPERATION;
2662 }
2663
2664 /*
2665  *      Called with sess->conn_lock held.
2666  */
2667 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2668         with active network interface */
2669 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2670 {
2671         struct iscsi_cmd *cmd;
2672         struct iscsi_conn *conn_p;
2673         bool found = false;
2674
2675         /*
2676          * Only send a Asynchronous Message on connections whos network
2677          * interface is still functional.
2678          */
2679         list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2680                 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2681                         iscsit_inc_conn_usage_count(conn_p);
2682                         found = true;
2683                         break;
2684                 }
2685         }
2686
2687         if (!found)
2688                 return;
2689
2690         cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2691         if (!cmd) {
2692                 iscsit_dec_conn_usage_count(conn_p);
2693                 return;
2694         }
2695
2696         cmd->logout_cid = conn->cid;
2697         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2698         cmd->i_state = ISTATE_SEND_ASYNCMSG;
2699
2700         spin_lock_bh(&conn_p->cmd_lock);
2701         list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2702         spin_unlock_bh(&conn_p->cmd_lock);
2703
2704         iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2705         iscsit_dec_conn_usage_count(conn_p);
2706 }
2707
2708 static int iscsit_send_conn_drop_async_message(
2709         struct iscsi_cmd *cmd,
2710         struct iscsi_conn *conn)
2711 {
2712         struct iscsi_async *hdr;
2713
2714         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2715
2716         hdr                     = (struct iscsi_async *) cmd->pdu;
2717         hdr->opcode             = ISCSI_OP_ASYNC_EVENT;
2718         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
2719         cmd->init_task_tag      = RESERVED_ITT;
2720         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2721         put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2722         cmd->stat_sn            = conn->stat_sn++;
2723         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2724         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2725         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2726         hdr->async_event        = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2727         hdr->param1             = cpu_to_be16(cmd->logout_cid);
2728         hdr->param2             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2729         hdr->param3             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2730
2731         pr_debug("Sending Connection Dropped Async Message StatSN:"
2732                 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2733                         cmd->logout_cid, conn->cid);
2734
2735         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2736 }
2737
2738 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2739 {
2740         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2741             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2742                 wait_for_completion_interruptible_timeout(
2743                                         &conn->tx_half_close_comp,
2744                                         ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2745         }
2746 }
2747
2748 void
2749 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2750                         struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2751                         bool set_statsn)
2752 {
2753         hdr->opcode             = ISCSI_OP_SCSI_DATA_IN;
2754         hdr->flags              = datain->flags;
2755         if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2756                 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2757                         hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2758                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2759                 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2760                         hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2761                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2762                 }
2763         }
2764         hton24(hdr->dlength, datain->length);
2765         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2766                 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2767                                 (struct scsi_lun *)&hdr->lun);
2768         else
2769                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2770
2771         hdr->itt                = cmd->init_task_tag;
2772
2773         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2774                 hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2775         else
2776                 hdr->ttt                = cpu_to_be32(0xFFFFFFFF);
2777         if (set_statsn)
2778                 hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2779         else
2780                 hdr->statsn             = cpu_to_be32(0xFFFFFFFF);
2781
2782         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2783         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2784         hdr->datasn             = cpu_to_be32(datain->data_sn);
2785         hdr->offset             = cpu_to_be32(datain->offset);
2786
2787         pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2788                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2789                 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2790                 ntohl(hdr->offset), datain->length, conn->cid);
2791 }
2792 EXPORT_SYMBOL(iscsit_build_datain_pdu);
2793
2794 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2795 {
2796         struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2797         struct iscsi_datain datain;
2798         struct iscsi_datain_req *dr;
2799         int eodr = 0, ret;
2800         bool set_statsn = false;
2801
2802         memset(&datain, 0, sizeof(struct iscsi_datain));
2803         dr = iscsit_get_datain_values(cmd, &datain);
2804         if (!dr) {
2805                 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2806                                 cmd->init_task_tag);
2807                 return -1;
2808         }
2809         /*
2810          * Be paranoid and double check the logic for now.
2811          */
2812         if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2813                 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2814                         " datain.length: %u exceeds cmd->data_length: %u\n",
2815                         cmd->init_task_tag, datain.offset, datain.length,
2816                         cmd->se_cmd.data_length);
2817                 return -1;
2818         }
2819
2820         atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2821         /*
2822          * Special case for successfully execution w/ both DATAIN
2823          * and Sense Data.
2824          */
2825         if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2826             (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2827                 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2828         else {
2829                 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2830                     (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2831                         iscsit_increment_maxcmdsn(cmd, conn->sess);
2832                         cmd->stat_sn = conn->stat_sn++;
2833                         set_statsn = true;
2834                 } else if (dr->dr_complete ==
2835                            DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2836                         set_statsn = true;
2837         }
2838
2839         iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2840
2841         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0);
2842         if (ret < 0)
2843                 return ret;
2844
2845         if (dr->dr_complete) {
2846                 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2847                                 2 : 1;
2848                 iscsit_free_datain_req(cmd, dr);
2849         }
2850
2851         return eodr;
2852 }
2853
2854 int
2855 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2856                         struct iscsi_logout_rsp *hdr)
2857 {
2858         struct iscsi_conn *logout_conn = NULL;
2859         struct iscsi_conn_recovery *cr = NULL;
2860         struct iscsi_session *sess = conn->sess;
2861         /*
2862          * The actual shutting down of Sessions and/or Connections
2863          * for CLOSESESSION and CLOSECONNECTION Logout Requests
2864          * is done in scsi_logout_post_handler().
2865          */
2866         switch (cmd->logout_reason) {
2867         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2868                 pr_debug("iSCSI session logout successful, setting"
2869                         " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2870                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2871                 break;
2872         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2873                 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2874                         break;
2875                 /*
2876                  * For CLOSECONNECTION logout requests carrying
2877                  * a matching logout CID -> local CID, the reference
2878                  * for the local CID will have been incremented in
2879                  * iscsi_logout_closeconnection().
2880                  *
2881                  * For CLOSECONNECTION logout requests carrying
2882                  * a different CID than the connection it arrived
2883                  * on, the connection responding to cmd->logout_cid
2884                  * is stopped in iscsit_logout_post_handler_diffcid().
2885                  */
2886
2887                 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2888                         " successful.\n", cmd->logout_cid, conn->cid);
2889                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2890                 break;
2891         case ISCSI_LOGOUT_REASON_RECOVERY:
2892                 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2893                     (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2894                         break;
2895                 /*
2896                  * If the connection is still active from our point of view
2897                  * force connection recovery to occur.
2898                  */
2899                 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2900                                 cmd->logout_cid);
2901                 if (logout_conn) {
2902                         iscsit_connection_reinstatement_rcfr(logout_conn);
2903                         iscsit_dec_conn_usage_count(logout_conn);
2904                 }
2905
2906                 cr = iscsit_get_inactive_connection_recovery_entry(
2907                                 conn->sess, cmd->logout_cid);
2908                 if (!cr) {
2909                         pr_err("Unable to locate CID: %hu for"
2910                         " REMOVECONNFORRECOVERY Logout Request.\n",
2911                                 cmd->logout_cid);
2912                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2913                         break;
2914                 }
2915
2916                 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2917
2918                 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2919                         " for recovery for CID: %hu on CID: %hu successful.\n",
2920                                 cmd->logout_cid, conn->cid);
2921                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2922                 break;
2923         default:
2924                 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2925                                 cmd->logout_reason);
2926                 return -1;
2927         }
2928
2929         hdr->opcode             = ISCSI_OP_LOGOUT_RSP;
2930         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2931         hdr->response           = cmd->logout_response;
2932         hdr->itt                = cmd->init_task_tag;
2933         cmd->stat_sn            = conn->stat_sn++;
2934         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2935
2936         iscsit_increment_maxcmdsn(cmd, conn->sess);
2937         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2938         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2939
2940         pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2941                 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2942                 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2943                 cmd->logout_cid, conn->cid);
2944
2945         return 0;
2946 }
2947 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2948
2949 static int
2950 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2951 {
2952         int rc;
2953
2954         rc = iscsit_build_logout_rsp(cmd, conn,
2955                         (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2956         if (rc < 0)
2957                 return rc;
2958
2959         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2960 }
2961
2962 void
2963 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2964                        struct iscsi_nopin *hdr, bool nopout_response)
2965 {
2966         hdr->opcode             = ISCSI_OP_NOOP_IN;
2967         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2968         hton24(hdr->dlength, cmd->buf_ptr_size);
2969         if (nopout_response)
2970                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2971         hdr->itt                = cmd->init_task_tag;
2972         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2973         cmd->stat_sn            = (nopout_response) ? conn->stat_sn++ :
2974                                   conn->stat_sn;
2975         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2976
2977         if (nopout_response)
2978                 iscsit_increment_maxcmdsn(cmd, conn->sess);
2979
2980         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2981         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2982
2983         pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2984                 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2985                 "Solicited" : "Unsolicited", cmd->init_task_tag,
2986                 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2987 }
2988 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2989
2990 /*
2991  *      Unsolicited NOPIN, either requesting a response or not.
2992  */
2993 static int iscsit_send_unsolicited_nopin(
2994         struct iscsi_cmd *cmd,
2995         struct iscsi_conn *conn,
2996         int want_response)
2997 {
2998         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
2999         int ret;
3000
3001         iscsit_build_nopin_rsp(cmd, conn, hdr, false);
3002
3003         pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
3004                 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
3005
3006         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3007         if (ret < 0)
3008                 return ret;
3009
3010         spin_lock_bh(&cmd->istate_lock);
3011         cmd->i_state = want_response ?
3012                 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
3013         spin_unlock_bh(&cmd->istate_lock);
3014
3015         return 0;
3016 }
3017
3018 static int
3019 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3020 {
3021         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3022
3023         iscsit_build_nopin_rsp(cmd, conn, hdr, true);
3024
3025         /*
3026          * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
3027          * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
3028          */
3029         pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size);
3030
3031         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3032                                                      cmd->buf_ptr,
3033                                                      cmd->buf_ptr_size);
3034 }
3035
3036 static int iscsit_send_r2t(
3037         struct iscsi_cmd *cmd,
3038         struct iscsi_conn *conn)
3039 {
3040         struct iscsi_r2t *r2t;
3041         struct iscsi_r2t_rsp *hdr;
3042         int ret;
3043
3044         r2t = iscsit_get_r2t_from_list(cmd);
3045         if (!r2t)
3046                 return -1;
3047
3048         hdr                     = (struct iscsi_r2t_rsp *) cmd->pdu;
3049         memset(hdr, 0, ISCSI_HDR_LEN);
3050         hdr->opcode             = ISCSI_OP_R2T;
3051         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3052         int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3053                         (struct scsi_lun *)&hdr->lun);
3054         hdr->itt                = cmd->init_task_tag;
3055         if (conn->conn_transport->iscsit_get_r2t_ttt)
3056                 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t);
3057         else
3058                 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
3059         hdr->ttt                = cpu_to_be32(r2t->targ_xfer_tag);
3060         hdr->statsn             = cpu_to_be32(conn->stat_sn);
3061         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3062         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3063         hdr->r2tsn              = cpu_to_be32(r2t->r2t_sn);
3064         hdr->data_offset        = cpu_to_be32(r2t->offset);
3065         hdr->data_length        = cpu_to_be32(r2t->xfer_len);
3066
3067         pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3068                 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3069                 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3070                 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3071                         r2t->offset, r2t->xfer_len, conn->cid);
3072
3073         spin_lock_bh(&cmd->r2t_lock);
3074         r2t->sent_r2t = 1;
3075         spin_unlock_bh(&cmd->r2t_lock);
3076
3077         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3078         if (ret < 0) {
3079                 return ret;
3080         }
3081
3082         spin_lock_bh(&cmd->dataout_timeout_lock);
3083         iscsit_start_dataout_timer(cmd, conn);
3084         spin_unlock_bh(&cmd->dataout_timeout_lock);
3085
3086         return 0;
3087 }
3088
3089 /*
3090  *      @recovery: If called from iscsi_task_reassign_complete_write() for
3091  *              connection recovery.
3092  */
3093 int iscsit_build_r2ts_for_cmd(
3094         struct iscsi_conn *conn,
3095         struct iscsi_cmd *cmd,
3096         bool recovery)
3097 {
3098         int first_r2t = 1;
3099         u32 offset = 0, xfer_len = 0;
3100
3101         spin_lock_bh(&cmd->r2t_lock);
3102         if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3103                 spin_unlock_bh(&cmd->r2t_lock);
3104                 return 0;
3105         }
3106
3107         if (conn->sess->sess_ops->DataSequenceInOrder &&
3108             !recovery)
3109                 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3110
3111         while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3112                 if (conn->sess->sess_ops->DataSequenceInOrder) {
3113                         offset = cmd->r2t_offset;
3114
3115                         if (first_r2t && recovery) {
3116                                 int new_data_end = offset +
3117                                         conn->sess->sess_ops->MaxBurstLength -
3118                                         cmd->next_burst_len;
3119
3120                                 if (new_data_end > cmd->se_cmd.data_length)
3121                                         xfer_len = cmd->se_cmd.data_length - offset;
3122                                 else
3123                                         xfer_len =
3124                                                 conn->sess->sess_ops->MaxBurstLength -
3125                                                 cmd->next_burst_len;
3126                         } else {
3127                                 int new_data_end = offset +
3128                                         conn->sess->sess_ops->MaxBurstLength;
3129
3130                                 if (new_data_end > cmd->se_cmd.data_length)
3131                                         xfer_len = cmd->se_cmd.data_length - offset;
3132                                 else
3133                                         xfer_len = conn->sess->sess_ops->MaxBurstLength;
3134                         }
3135                         cmd->r2t_offset += xfer_len;
3136
3137                         if (cmd->r2t_offset == cmd->se_cmd.data_length)
3138                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3139                 } else {
3140                         struct iscsi_seq *seq;
3141
3142                         seq = iscsit_get_seq_holder_for_r2t(cmd);
3143                         if (!seq) {
3144                                 spin_unlock_bh(&cmd->r2t_lock);
3145                                 return -1;
3146                         }
3147
3148                         offset = seq->offset;
3149                         xfer_len = seq->xfer_len;
3150
3151                         if (cmd->seq_send_order == cmd->seq_count)
3152                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3153                 }
3154                 cmd->outstanding_r2ts++;
3155                 first_r2t = 0;
3156
3157                 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3158                         spin_unlock_bh(&cmd->r2t_lock);
3159                         return -1;
3160                 }
3161
3162                 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3163                         break;
3164         }
3165         spin_unlock_bh(&cmd->r2t_lock);
3166
3167         return 0;
3168 }
3169 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd);
3170
3171 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3172                         bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3173 {
3174         if (inc_stat_sn)
3175                 cmd->stat_sn = conn->stat_sn++;
3176
3177         atomic_long_inc(&conn->sess->rsp_pdus);
3178
3179         memset(hdr, 0, ISCSI_HDR_LEN);
3180         hdr->opcode             = ISCSI_OP_SCSI_CMD_RSP;
3181         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3182         if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3183                 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3184                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3185         } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3186                 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3187                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3188         }
3189         hdr->response           = cmd->iscsi_response;
3190         hdr->cmd_status         = cmd->se_cmd.scsi_status;
3191         hdr->itt                = cmd->init_task_tag;
3192         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3193
3194         iscsit_increment_maxcmdsn(cmd, conn->sess);
3195         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3196         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3197
3198         pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3199                 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3200                 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3201                 cmd->se_cmd.scsi_status, conn->cid);
3202 }
3203 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3204
3205 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3206 {
3207         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3208         bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3209         void *data_buf = NULL;
3210         u32 padding = 0, data_buf_len = 0;
3211
3212         iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3213
3214         /*
3215          * Attach SENSE DATA payload to iSCSI Response PDU
3216          */
3217         if (cmd->se_cmd.sense_buffer &&
3218            ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3219             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3220                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3221                 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3222
3223                 padding         = -(cmd->se_cmd.scsi_sense_length) & 3;
3224                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3225                 data_buf = cmd->sense_buffer;
3226                 data_buf_len = cmd->se_cmd.scsi_sense_length + padding;
3227
3228                 if (padding) {
3229                         memset(cmd->sense_buffer +
3230                                 cmd->se_cmd.scsi_sense_length, 0, padding);
3231                         pr_debug("Adding %u bytes of padding to"
3232                                 " SENSE.\n", padding);
3233                 }
3234
3235                 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3236                                 " Response PDU\n",
3237                                 cmd->se_cmd.scsi_sense_length);
3238         }
3239
3240         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf,
3241                                                      data_buf_len);
3242 }
3243
3244 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3245 {
3246         switch (se_tmr->response) {
3247         case TMR_FUNCTION_COMPLETE:
3248                 return ISCSI_TMF_RSP_COMPLETE;
3249         case TMR_TASK_DOES_NOT_EXIST:
3250                 return ISCSI_TMF_RSP_NO_TASK;
3251         case TMR_LUN_DOES_NOT_EXIST:
3252                 return ISCSI_TMF_RSP_NO_LUN;
3253         case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3254                 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3255         case TMR_FUNCTION_REJECTED:
3256         default:
3257                 return ISCSI_TMF_RSP_REJECTED;
3258         }
3259 }
3260
3261 void
3262 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3263                           struct iscsi_tm_rsp *hdr)
3264 {
3265         struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3266
3267         hdr->opcode             = ISCSI_OP_SCSI_TMFUNC_RSP;
3268         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
3269         hdr->response           = iscsit_convert_tcm_tmr_rsp(se_tmr);
3270         hdr->itt                = cmd->init_task_tag;
3271         cmd->stat_sn            = conn->stat_sn++;
3272         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3273
3274         iscsit_increment_maxcmdsn(cmd, conn->sess);
3275         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3276         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3277
3278         pr_debug("Built Task Management Response ITT: 0x%08x,"
3279                 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3280                 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3281 }
3282 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3283
3284 static int
3285 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3286 {
3287         struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3288
3289         iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3290
3291         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3292 }
3293
3294 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3295 {
3296         bool ret = false;
3297
3298         if (np->np_sockaddr.ss_family == AF_INET6) {
3299                 const struct sockaddr_in6 sin6 = {
3300                         .sin6_addr = IN6ADDR_ANY_INIT };
3301                 struct sockaddr_in6 *sock_in6 =
3302                          (struct sockaddr_in6 *)&np->np_sockaddr;
3303
3304                 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3305                                 sin6.sin6_addr.s6_addr, 16))
3306                         ret = true;
3307         } else {
3308                 struct sockaddr_in * sock_in =
3309                         (struct sockaddr_in *)&np->np_sockaddr;
3310
3311                 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
3312                         ret = true;
3313         }
3314
3315         return ret;
3316 }
3317
3318 #define SENDTARGETS_BUF_LIMIT 32768U
3319
3320 static int
3321 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
3322                                   enum iscsit_transport_type network_transport,
3323                                   int skip_bytes, bool *completed)
3324 {
3325         char *payload = NULL;
3326         struct iscsi_conn *conn = cmd->conn;
3327         struct iscsi_portal_group *tpg;
3328         struct iscsi_tiqn *tiqn;
3329         struct iscsi_tpg_np *tpg_np;
3330         int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3331         int target_name_printed;
3332         unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3333         unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3334         bool active;
3335
3336         buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3337                          SENDTARGETS_BUF_LIMIT);
3338
3339         payload = kzalloc(buffer_len, GFP_KERNEL);
3340         if (!payload)
3341                 return -ENOMEM;
3342
3343         /*
3344          * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3345          * explicit case..
3346          */
3347         if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3348                 text_ptr = strchr(text_in, '=');
3349                 if (!text_ptr) {
3350                         pr_err("Unable to locate '=' string in text_in:"
3351                                " %s\n", text_in);
3352                         kfree(payload);
3353                         return -EINVAL;
3354                 }
3355                 /*
3356                  * Skip over '=' character..
3357                  */
3358                 text_ptr += 1;
3359         }
3360
3361         spin_lock(&tiqn_lock);
3362         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3363                 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3364                      strcmp(tiqn->tiqn, text_ptr)) {
3365                         continue;
3366                 }
3367
3368                 target_name_printed = 0;
3369
3370                 spin_lock(&tiqn->tiqn_tpg_lock);
3371                 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3372
3373                         /* If demo_mode_discovery=0 and generate_node_acls=0
3374                          * (demo mode dislabed) do not return
3375                          * TargetName+TargetAddress unless a NodeACL exists.
3376                          */
3377
3378                         if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3379                             (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3380                             (!target_tpg_has_node_acl(&tpg->tpg_se_tpg,
3381                                 cmd->conn->sess->sess_ops->InitiatorName))) {
3382                                 continue;
3383                         }
3384
3385                         spin_lock(&tpg->tpg_state_lock);
3386                         active = (tpg->tpg_state == TPG_STATE_ACTIVE);
3387                         spin_unlock(&tpg->tpg_state_lock);
3388
3389                         if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets)
3390                                 continue;
3391
3392                         spin_lock(&tpg->tpg_np_lock);
3393                         list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3394                                                 tpg_np_list) {
3395                                 struct iscsi_np *np = tpg_np->tpg_np;
3396                                 bool inaddr_any = iscsit_check_inaddr_any(np);
3397                                 struct sockaddr_storage *sockaddr;
3398
3399                                 if (np->np_network_transport != network_transport)
3400                                         continue;
3401
3402                                 if (!target_name_printed) {
3403                                         len = sprintf(buf, "TargetName=%s",
3404                                                       tiqn->tiqn);
3405                                         len += 1;
3406
3407                                         if ((len + payload_len) > buffer_len) {
3408                                                 spin_unlock(&tpg->tpg_np_lock);
3409                                                 spin_unlock(&tiqn->tiqn_tpg_lock);
3410                                                 end_of_buf = 1;
3411                                                 goto eob;
3412                                         }
3413
3414                                         if (skip_bytes && len <= skip_bytes) {
3415                                                 skip_bytes -= len;
3416                                         } else {
3417                                                 memcpy(payload + payload_len, buf, len);
3418                                                 payload_len += len;
3419                                                 target_name_printed = 1;
3420                                                 if (len > skip_bytes)
3421                                                         skip_bytes = 0;
3422                                         }
3423                                 }
3424
3425                                 if (inaddr_any)
3426                                         sockaddr = &conn->local_sockaddr;
3427                                 else
3428                                         sockaddr = &np->np_sockaddr;
3429
3430                                 len = sprintf(buf, "TargetAddress="
3431                                               "%pISpc,%hu",
3432                                               sockaddr,
3433                                               tpg->tpgt);
3434                                 len += 1;
3435
3436                                 if ((len + payload_len) > buffer_len) {
3437                                         spin_unlock(&tpg->tpg_np_lock);
3438                                         spin_unlock(&tiqn->tiqn_tpg_lock);
3439                                         end_of_buf = 1;
3440                                         goto eob;
3441                                 }
3442
3443                                 if (skip_bytes && len <= skip_bytes) {
3444                                         skip_bytes -= len;
3445                                 } else {
3446                                         memcpy(payload + payload_len, buf, len);
3447                                         payload_len += len;
3448                                         if (len > skip_bytes)
3449                                                 skip_bytes = 0;
3450                                 }
3451                         }
3452                         spin_unlock(&tpg->tpg_np_lock);
3453                 }
3454                 spin_unlock(&tiqn->tiqn_tpg_lock);
3455 eob:
3456                 if (end_of_buf) {
3457                         *completed = false;
3458                         break;
3459                 }
3460
3461                 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3462                         break;
3463         }
3464         spin_unlock(&tiqn_lock);
3465
3466         cmd->buf_ptr = payload;
3467
3468         return payload_len;
3469 }
3470
3471 int
3472 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3473                       struct iscsi_text_rsp *hdr,
3474                       enum iscsit_transport_type network_transport)
3475 {
3476         int text_length, padding;
3477         bool completed = true;
3478
3479         text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3480                                                         cmd->read_data_done,
3481                                                         &completed);
3482         if (text_length < 0)
3483                 return text_length;
3484
3485         if (completed) {
3486                 hdr->flags = ISCSI_FLAG_CMD_FINAL;
3487         } else {
3488                 hdr->flags = ISCSI_FLAG_TEXT_CONTINUE;
3489                 cmd->read_data_done += text_length;
3490                 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3491                         cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3492         }
3493         hdr->opcode = ISCSI_OP_TEXT_RSP;
3494         padding = ((-text_length) & 3);
3495         hton24(hdr->dlength, text_length);
3496         hdr->itt = cmd->init_task_tag;
3497         hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3498         cmd->stat_sn = conn->stat_sn++;
3499         hdr->statsn = cpu_to_be32(cmd->stat_sn);
3500
3501         iscsit_increment_maxcmdsn(cmd, conn->sess);
3502         /*
3503          * Reset maxcmdsn_inc in multi-part text payload exchanges to
3504          * correctly increment MaxCmdSN for each response answering a
3505          * non immediate text request with a valid CmdSN.
3506          */
3507         cmd->maxcmdsn_inc = 0;
3508         hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3509         hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3510
3511         pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3512                 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3513                 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3514                 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3515                 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3516
3517         return text_length + padding;
3518 }
3519 EXPORT_SYMBOL(iscsit_build_text_rsp);
3520
3521 static int iscsit_send_text_rsp(
3522         struct iscsi_cmd *cmd,
3523         struct iscsi_conn *conn)
3524 {
3525         struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3526         int text_length;
3527
3528         text_length = iscsit_build_text_rsp(cmd, conn, hdr,
3529                                 conn->conn_transport->transport_type);
3530         if (text_length < 0)
3531                 return text_length;
3532
3533         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3534                                                      cmd->buf_ptr,
3535                                                      text_length);
3536 }
3537
3538 void
3539 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3540                     struct iscsi_reject *hdr)
3541 {
3542         hdr->opcode             = ISCSI_OP_REJECT;
3543         hdr->reason             = cmd->reject_reason;
3544         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3545         hton24(hdr->dlength, ISCSI_HDR_LEN);
3546         hdr->ffffffff           = cpu_to_be32(0xffffffff);
3547         cmd->stat_sn            = conn->stat_sn++;
3548         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3549         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3550         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3551
3552 }
3553 EXPORT_SYMBOL(iscsit_build_reject);
3554
3555 static int iscsit_send_reject(
3556         struct iscsi_cmd *cmd,
3557         struct iscsi_conn *conn)
3558 {
3559         struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3560
3561         iscsit_build_reject(cmd, conn, hdr);
3562
3563         pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3564                 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3565
3566         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3567                                                      cmd->buf_ptr,
3568                                                      ISCSI_HDR_LEN);
3569 }
3570
3571 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3572 {
3573         int ord, cpu;
3574         /*
3575          * bitmap_id is assigned from iscsit_global->ts_bitmap from
3576          * within iscsit_start_kthreads()
3577          *
3578          * Here we use bitmap_id to determine which CPU that this
3579          * iSCSI connection's RX/TX threads will be scheduled to
3580          * execute upon.
3581          */
3582         ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3583         for_each_online_cpu(cpu) {
3584                 if (ord-- == 0) {
3585                         cpumask_set_cpu(cpu, conn->conn_cpumask);
3586                         return;
3587                 }
3588         }
3589         /*
3590          * This should never be reached..
3591          */
3592         dump_stack();
3593         cpumask_setall(conn->conn_cpumask);
3594 }
3595
3596 int
3597 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3598 {
3599         int ret;
3600
3601         switch (state) {
3602         case ISTATE_SEND_R2T:
3603                 ret = iscsit_send_r2t(cmd, conn);
3604                 if (ret < 0)
3605                         goto err;
3606                 break;
3607         case ISTATE_REMOVE:
3608                 spin_lock_bh(&conn->cmd_lock);
3609                 list_del_init(&cmd->i_conn_node);
3610                 spin_unlock_bh(&conn->cmd_lock);
3611
3612                 iscsit_free_cmd(cmd, false);
3613                 break;
3614         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3615                 iscsit_mod_nopin_response_timer(conn);
3616                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3617                 if (ret < 0)
3618                         goto err;
3619                 break;
3620         case ISTATE_SEND_NOPIN_NO_RESPONSE:
3621                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3622                 if (ret < 0)
3623                         goto err;
3624                 break;
3625         default:
3626                 pr_err("Unknown Opcode: 0x%02x ITT:"
3627                        " 0x%08x, i_state: %d on CID: %hu\n",
3628                        cmd->iscsi_opcode, cmd->init_task_tag, state,
3629                        conn->cid);
3630                 goto err;
3631         }
3632
3633         return 0;
3634
3635 err:
3636         return -1;
3637 }
3638 EXPORT_SYMBOL(iscsit_immediate_queue);
3639
3640 static int
3641 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3642 {
3643         struct iscsit_transport *t = conn->conn_transport;
3644         struct iscsi_queue_req *qr;
3645         struct iscsi_cmd *cmd;
3646         u8 state;
3647         int ret;
3648
3649         while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3650                 atomic_set(&conn->check_immediate_queue, 0);
3651                 cmd = qr->cmd;
3652                 state = qr->state;
3653                 kmem_cache_free(lio_qr_cache, qr);
3654
3655                 ret = t->iscsit_immediate_queue(conn, cmd, state);
3656                 if (ret < 0)
3657                         return ret;
3658         }
3659
3660         return 0;
3661 }
3662
3663 int
3664 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3665 {
3666         int ret;
3667
3668 check_rsp_state:
3669         switch (state) {
3670         case ISTATE_SEND_DATAIN:
3671                 ret = iscsit_send_datain(cmd, conn);
3672                 if (ret < 0)
3673                         goto err;
3674                 else if (!ret)
3675                         /* more drs */
3676                         goto check_rsp_state;
3677                 else if (ret == 1) {
3678                         /* all done */
3679                         spin_lock_bh(&cmd->istate_lock);
3680                         cmd->i_state = ISTATE_SENT_STATUS;
3681                         spin_unlock_bh(&cmd->istate_lock);
3682
3683                         if (atomic_read(&conn->check_immediate_queue))
3684                                 return 1;
3685
3686                         return 0;
3687                 } else if (ret == 2) {
3688                         /* Still must send status,
3689                            SCF_TRANSPORT_TASK_SENSE was set */
3690                         spin_lock_bh(&cmd->istate_lock);
3691                         cmd->i_state = ISTATE_SEND_STATUS;
3692                         spin_unlock_bh(&cmd->istate_lock);
3693                         state = ISTATE_SEND_STATUS;
3694                         goto check_rsp_state;
3695                 }
3696
3697                 break;
3698         case ISTATE_SEND_STATUS:
3699         case ISTATE_SEND_STATUS_RECOVERY:
3700                 ret = iscsit_send_response(cmd, conn);
3701                 break;
3702         case ISTATE_SEND_LOGOUTRSP:
3703                 ret = iscsit_send_logout(cmd, conn);
3704                 break;
3705         case ISTATE_SEND_ASYNCMSG:
3706                 ret = iscsit_send_conn_drop_async_message(
3707                         cmd, conn);
3708                 break;
3709         case ISTATE_SEND_NOPIN:
3710                 ret = iscsit_send_nopin(cmd, conn);
3711                 break;
3712         case ISTATE_SEND_REJECT:
3713                 ret = iscsit_send_reject(cmd, conn);
3714                 break;
3715         case ISTATE_SEND_TASKMGTRSP:
3716                 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3717                 if (ret != 0)
3718                         break;
3719                 ret = iscsit_tmr_post_handler(cmd, conn);
3720                 if (ret != 0)
3721                         iscsit_fall_back_to_erl0(conn->sess);
3722                 break;
3723         case ISTATE_SEND_TEXTRSP:
3724                 ret = iscsit_send_text_rsp(cmd, conn);
3725                 break;
3726         default:
3727                 pr_err("Unknown Opcode: 0x%02x ITT:"
3728                        " 0x%08x, i_state: %d on CID: %hu\n",
3729                        cmd->iscsi_opcode, cmd->init_task_tag,
3730                        state, conn->cid);
3731                 goto err;
3732         }
3733         if (ret < 0)
3734                 goto err;
3735
3736         switch (state) {
3737         case ISTATE_SEND_LOGOUTRSP:
3738                 if (!iscsit_logout_post_handler(cmd, conn))
3739                         return -ECONNRESET;
3740                 /* fall through */
3741         case ISTATE_SEND_STATUS:
3742         case ISTATE_SEND_ASYNCMSG:
3743         case ISTATE_SEND_NOPIN:
3744         case ISTATE_SEND_STATUS_RECOVERY:
3745         case ISTATE_SEND_TEXTRSP:
3746         case ISTATE_SEND_TASKMGTRSP:
3747         case ISTATE_SEND_REJECT:
3748                 spin_lock_bh(&cmd->istate_lock);
3749                 cmd->i_state = ISTATE_SENT_STATUS;
3750                 spin_unlock_bh(&cmd->istate_lock);
3751                 break;
3752         default:
3753                 pr_err("Unknown Opcode: 0x%02x ITT:"
3754                        " 0x%08x, i_state: %d on CID: %hu\n",
3755                        cmd->iscsi_opcode, cmd->init_task_tag,
3756                        cmd->i_state, conn->cid);
3757                 goto err;
3758         }
3759
3760         if (atomic_read(&conn->check_immediate_queue))
3761                 return 1;
3762
3763         return 0;
3764
3765 err:
3766         return -1;
3767 }
3768 EXPORT_SYMBOL(iscsit_response_queue);
3769
3770 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3771 {
3772         struct iscsit_transport *t = conn->conn_transport;
3773         struct iscsi_queue_req *qr;
3774         struct iscsi_cmd *cmd;
3775         u8 state;
3776         int ret;
3777
3778         while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3779                 cmd = qr->cmd;
3780                 state = qr->state;
3781                 kmem_cache_free(lio_qr_cache, qr);
3782
3783                 ret = t->iscsit_response_queue(conn, cmd, state);
3784                 if (ret == 1 || ret < 0)
3785                         return ret;
3786         }
3787
3788         return 0;
3789 }
3790
3791 int iscsi_target_tx_thread(void *arg)
3792 {
3793         int ret = 0;
3794         struct iscsi_conn *conn = arg;
3795         bool conn_freed = false;
3796
3797         /*
3798          * Allow ourselves to be interrupted by SIGINT so that a
3799          * connection recovery / failure event can be triggered externally.
3800          */
3801         allow_signal(SIGINT);
3802
3803         while (!kthread_should_stop()) {
3804                 /*
3805                  * Ensure that both TX and RX per connection kthreads
3806                  * are scheduled to run on the same CPU.
3807                  */
3808                 iscsit_thread_check_cpumask(conn, current, 1);
3809
3810                 wait_event_interruptible(conn->queues_wq,
3811                                          !iscsit_conn_all_queues_empty(conn));
3812
3813                 if (signal_pending(current))
3814                         goto transport_err;
3815
3816 get_immediate:
3817                 ret = iscsit_handle_immediate_queue(conn);
3818                 if (ret < 0)
3819                         goto transport_err;
3820
3821                 ret = iscsit_handle_response_queue(conn);
3822                 if (ret == 1) {
3823                         goto get_immediate;
3824                 } else if (ret == -ECONNRESET) {
3825                         conn_freed = true;
3826                         goto out;
3827                 } else if (ret < 0) {
3828                         goto transport_err;
3829                 }
3830         }
3831
3832 transport_err:
3833         /*
3834          * Avoid the normal connection failure code-path if this connection
3835          * is still within LOGIN mode, and iscsi_np process context is
3836          * responsible for cleaning up the early connection failure.
3837          */
3838         if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
3839                 iscsit_take_action_for_connection_exit(conn, &conn_freed);
3840 out:
3841         if (!conn_freed) {
3842                 while (!kthread_should_stop()) {
3843                         msleep(100);
3844                 }
3845         }
3846         return 0;
3847 }
3848
3849 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3850 {
3851         struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3852         struct iscsi_cmd *cmd;
3853         int ret = 0;
3854
3855         switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3856         case ISCSI_OP_SCSI_CMD:
3857                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3858                 if (!cmd)
3859                         goto reject;
3860
3861                 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3862                 break;
3863         case ISCSI_OP_SCSI_DATA_OUT:
3864                 ret = iscsit_handle_data_out(conn, buf);
3865                 break;
3866         case ISCSI_OP_NOOP_OUT:
3867                 cmd = NULL;
3868                 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3869                         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3870                         if (!cmd)
3871                                 goto reject;
3872                 }
3873                 ret = iscsit_handle_nop_out(conn, cmd, buf);
3874                 break;
3875         case ISCSI_OP_SCSI_TMFUNC:
3876                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3877                 if (!cmd)
3878                         goto reject;
3879
3880                 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3881                 break;
3882         case ISCSI_OP_TEXT:
3883                 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
3884                         cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
3885                         if (!cmd)
3886                                 goto reject;
3887                 } else {
3888                         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3889                         if (!cmd)
3890                                 goto reject;
3891                 }
3892
3893                 ret = iscsit_handle_text_cmd(conn, cmd, buf);
3894                 break;
3895         case ISCSI_OP_LOGOUT:
3896                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3897                 if (!cmd)
3898                         goto reject;
3899
3900                 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3901                 if (ret > 0)
3902                         wait_for_completion_timeout(&conn->conn_logout_comp,
3903                                         SECONDS_FOR_LOGOUT_COMP * HZ);
3904                 break;
3905         case ISCSI_OP_SNACK:
3906                 ret = iscsit_handle_snack(conn, buf);
3907                 break;
3908         default:
3909                 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
3910                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3911                         pr_err("Cannot recover from unknown"
3912                         " opcode while ERL=0, closing iSCSI connection.\n");
3913                         return -1;
3914                 }
3915                 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
3916                        " closing iSCSI connection.\n");
3917                 ret = -1;
3918                 break;
3919         }
3920
3921         return ret;
3922 reject:
3923         return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3924 }
3925
3926 static bool iscsi_target_check_conn_state(struct iscsi_conn *conn)
3927 {
3928         bool ret;
3929
3930         spin_lock_bh(&conn->state_lock);
3931         ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN);
3932         spin_unlock_bh(&conn->state_lock);
3933
3934         return ret;
3935 }
3936
3937 static void iscsit_get_rx_pdu(struct iscsi_conn *conn)
3938 {
3939         int ret;
3940         u8 buffer[ISCSI_HDR_LEN], opcode;
3941         u32 checksum = 0, digest = 0;
3942         struct kvec iov;
3943
3944         while (!kthread_should_stop()) {
3945                 /*
3946                  * Ensure that both TX and RX per connection kthreads
3947                  * are scheduled to run on the same CPU.
3948                  */
3949                 iscsit_thread_check_cpumask(conn, current, 0);
3950
3951                 memset(buffer, 0, ISCSI_HDR_LEN);
3952                 memset(&iov, 0, sizeof(struct kvec));
3953
3954                 iov.iov_base    = buffer;
3955                 iov.iov_len     = ISCSI_HDR_LEN;
3956
3957                 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3958                 if (ret != ISCSI_HDR_LEN) {
3959                         iscsit_rx_thread_wait_for_tcp(conn);
3960                         return;
3961                 }
3962
3963                 if (conn->conn_ops->HeaderDigest) {
3964                         iov.iov_base    = &digest;
3965                         iov.iov_len     = ISCSI_CRC_LEN;
3966
3967                         ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3968                         if (ret != ISCSI_CRC_LEN) {
3969                                 iscsit_rx_thread_wait_for_tcp(conn);
3970                                 return;
3971                         }
3972
3973                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash, buffer,
3974                                                   ISCSI_HDR_LEN, 0, NULL,
3975                                                   &checksum);
3976
3977                         if (digest != checksum) {
3978                                 pr_err("HeaderDigest CRC32C failed,"
3979                                         " received 0x%08x, computed 0x%08x\n",
3980                                         digest, checksum);
3981                                 /*
3982                                  * Set the PDU to 0xff so it will intentionally
3983                                  * hit default in the switch below.
3984                                  */
3985                                 memset(buffer, 0xff, ISCSI_HDR_LEN);
3986                                 atomic_long_inc(&conn->sess->conn_digest_errors);
3987                         } else {
3988                                 pr_debug("Got HeaderDigest CRC32C"
3989                                                 " 0x%08x\n", checksum);
3990                         }
3991                 }
3992
3993                 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
3994                         return;
3995
3996                 opcode = buffer[0] & ISCSI_OPCODE_MASK;
3997
3998                 if (conn->sess->sess_ops->SessionType &&
3999                    ((!(opcode & ISCSI_OP_TEXT)) ||
4000                     (!(opcode & ISCSI_OP_LOGOUT)))) {
4001                         pr_err("Received illegal iSCSI Opcode: 0x%02x"
4002                         " while in Discovery Session, rejecting.\n", opcode);
4003                         iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4004                                           buffer);
4005                         return;
4006                 }
4007
4008                 ret = iscsi_target_rx_opcode(conn, buffer);
4009                 if (ret < 0)
4010                         return;
4011         }
4012 }
4013
4014 int iscsi_target_rx_thread(void *arg)
4015 {
4016         int rc;
4017         struct iscsi_conn *conn = arg;
4018         bool conn_freed = false;
4019
4020         /*
4021          * Allow ourselves to be interrupted by SIGINT so that a
4022          * connection recovery / failure event can be triggered externally.
4023          */
4024         allow_signal(SIGINT);
4025         /*
4026          * Wait for iscsi_post_login_handler() to complete before allowing
4027          * incoming iscsi/tcp socket I/O, and/or failing the connection.
4028          */
4029         rc = wait_for_completion_interruptible(&conn->rx_login_comp);
4030         if (rc < 0 || iscsi_target_check_conn_state(conn))
4031                 goto out;
4032
4033         if (!conn->conn_transport->iscsit_get_rx_pdu)
4034                 return 0;
4035
4036         conn->conn_transport->iscsit_get_rx_pdu(conn);
4037
4038         if (!signal_pending(current))
4039                 atomic_set(&conn->transport_failed, 1);
4040         iscsit_take_action_for_connection_exit(conn, &conn_freed);
4041
4042 out:
4043         if (!conn_freed) {
4044                 while (!kthread_should_stop()) {
4045                         msleep(100);
4046                 }
4047         }
4048
4049         return 0;
4050 }
4051
4052 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4053 {
4054         LIST_HEAD(tmp_list);
4055         struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4056         struct iscsi_session *sess = conn->sess;
4057         /*
4058          * We expect this function to only ever be called from either RX or TX
4059          * thread context via iscsit_close_connection() once the other context
4060          * has been reset -> returned sleeping pre-handler state.
4061          */
4062         spin_lock_bh(&conn->cmd_lock);
4063         list_splice_init(&conn->conn_cmd_list, &tmp_list);
4064
4065         list_for_each_entry(cmd, &tmp_list, i_conn_node) {
4066                 struct se_cmd *se_cmd = &cmd->se_cmd;
4067
4068                 if (se_cmd->se_tfo != NULL) {
4069                         spin_lock(&se_cmd->t_state_lock);
4070                         se_cmd->transport_state |= CMD_T_FABRIC_STOP;
4071                         spin_unlock(&se_cmd->t_state_lock);
4072                 }
4073         }
4074         spin_unlock_bh(&conn->cmd_lock);
4075
4076         list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4077                 list_del_init(&cmd->i_conn_node);
4078
4079                 iscsit_increment_maxcmdsn(cmd, sess);
4080                 iscsit_free_cmd(cmd, true);
4081
4082         }
4083 }
4084
4085 static void iscsit_stop_timers_for_cmds(
4086         struct iscsi_conn *conn)
4087 {
4088         struct iscsi_cmd *cmd;
4089
4090         spin_lock_bh(&conn->cmd_lock);
4091         list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4092                 if (cmd->data_direction == DMA_TO_DEVICE)
4093                         iscsit_stop_dataout_timer(cmd);
4094         }
4095         spin_unlock_bh(&conn->cmd_lock);
4096 }
4097
4098 int iscsit_close_connection(
4099         struct iscsi_conn *conn)
4100 {
4101         int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4102         struct iscsi_session    *sess = conn->sess;
4103
4104         pr_debug("Closing iSCSI connection CID %hu on SID:"
4105                 " %u\n", conn->cid, sess->sid);
4106         /*
4107          * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD
4108          * case just in case the RX Thread in iscsi_target_rx_opcode() is
4109          * sleeping and the logout response never got sent because the
4110          * connection failed.
4111          *
4112          * However for iser-target, isert_wait4logout() is using conn_logout_comp
4113          * to signal logout response TX interrupt completion.  Go ahead and skip
4114          * this for iser since isert_rx_opcode() does not wait on logout failure,
4115          * and to avoid iscsi_conn pointer dereference in iser-target code.
4116          */
4117         if (!conn->conn_transport->rdma_shutdown)
4118                 complete(&conn->conn_logout_comp);
4119
4120         if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4121                 if (conn->tx_thread &&
4122                     cmpxchg(&conn->tx_thread_active, true, false)) {
4123                         send_sig(SIGINT, conn->tx_thread, 1);
4124                         kthread_stop(conn->tx_thread);
4125                 }
4126         } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4127                 if (conn->rx_thread &&
4128                     cmpxchg(&conn->rx_thread_active, true, false)) {
4129                         send_sig(SIGINT, conn->rx_thread, 1);
4130                         kthread_stop(conn->rx_thread);
4131                 }
4132         }
4133
4134         spin_lock(&iscsit_global->ts_bitmap_lock);
4135         bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4136                               get_order(1));
4137         spin_unlock(&iscsit_global->ts_bitmap_lock);
4138
4139         iscsit_stop_timers_for_cmds(conn);
4140         iscsit_stop_nopin_response_timer(conn);
4141         iscsit_stop_nopin_timer(conn);
4142
4143         if (conn->conn_transport->iscsit_wait_conn)
4144                 conn->conn_transport->iscsit_wait_conn(conn);
4145
4146         /*
4147          * During Connection recovery drop unacknowledged out of order
4148          * commands for this connection, and prepare the other commands
4149          * for reallegiance.
4150          *
4151          * During normal operation clear the out of order commands (but
4152          * do not free the struct iscsi_ooo_cmdsn's) and release all
4153          * struct iscsi_cmds.
4154          */
4155         if (atomic_read(&conn->connection_recovery)) {
4156                 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4157                 iscsit_prepare_cmds_for_reallegiance(conn);
4158         } else {
4159                 iscsit_clear_ooo_cmdsns_for_conn(conn);
4160                 iscsit_release_commands_from_conn(conn);
4161         }
4162         iscsit_free_queue_reqs_for_conn(conn);
4163
4164         /*
4165          * Handle decrementing session or connection usage count if
4166          * a logout response was not able to be sent because the
4167          * connection failed.  Fall back to Session Recovery here.
4168          */
4169         if (atomic_read(&conn->conn_logout_remove)) {
4170                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4171                         iscsit_dec_conn_usage_count(conn);
4172                         iscsit_dec_session_usage_count(sess);
4173                 }
4174                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4175                         iscsit_dec_conn_usage_count(conn);
4176
4177                 atomic_set(&conn->conn_logout_remove, 0);
4178                 atomic_set(&sess->session_reinstatement, 0);
4179                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4180         }
4181
4182         spin_lock_bh(&sess->conn_lock);
4183         list_del(&conn->conn_list);
4184
4185         /*
4186          * Attempt to let the Initiator know this connection failed by
4187          * sending an Connection Dropped Async Message on another
4188          * active connection.
4189          */
4190         if (atomic_read(&conn->connection_recovery))
4191                 iscsit_build_conn_drop_async_message(conn);
4192
4193         spin_unlock_bh(&sess->conn_lock);
4194
4195         /*
4196          * If connection reinstatement is being performed on this connection,
4197          * up the connection reinstatement semaphore that is being blocked on
4198          * in iscsit_cause_connection_reinstatement().
4199          */
4200         spin_lock_bh(&conn->state_lock);
4201         if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4202                 spin_unlock_bh(&conn->state_lock);
4203                 complete(&conn->conn_wait_comp);
4204                 wait_for_completion(&conn->conn_post_wait_comp);
4205                 spin_lock_bh(&conn->state_lock);
4206         }
4207
4208         /*
4209          * If connection reinstatement is being performed on this connection
4210          * by receiving a REMOVECONNFORRECOVERY logout request, up the
4211          * connection wait rcfr semaphore that is being blocked on
4212          * an iscsit_connection_reinstatement_rcfr().
4213          */
4214         if (atomic_read(&conn->connection_wait_rcfr)) {
4215                 spin_unlock_bh(&conn->state_lock);
4216                 complete(&conn->conn_wait_rcfr_comp);
4217                 wait_for_completion(&conn->conn_post_wait_comp);
4218                 spin_lock_bh(&conn->state_lock);
4219         }
4220         atomic_set(&conn->connection_reinstatement, 1);
4221         spin_unlock_bh(&conn->state_lock);
4222
4223         /*
4224          * If any other processes are accessing this connection pointer we
4225          * must wait until they have completed.
4226          */
4227         iscsit_check_conn_usage_count(conn);
4228
4229         ahash_request_free(conn->conn_tx_hash);
4230         if (conn->conn_rx_hash) {
4231                 struct crypto_ahash *tfm;
4232
4233                 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
4234                 ahash_request_free(conn->conn_rx_hash);
4235                 crypto_free_ahash(tfm);
4236         }
4237
4238         free_cpumask_var(conn->conn_cpumask);
4239
4240         kfree(conn->conn_ops);
4241         conn->conn_ops = NULL;
4242
4243         if (conn->sock)
4244                 sock_release(conn->sock);
4245
4246         if (conn->conn_transport->iscsit_free_conn)
4247                 conn->conn_transport->iscsit_free_conn(conn);
4248
4249         iscsit_put_transport(conn->conn_transport);
4250
4251         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4252         conn->conn_state = TARG_CONN_STATE_FREE;
4253         kfree(conn);
4254
4255         spin_lock_bh(&sess->conn_lock);
4256         atomic_dec(&sess->nconn);
4257         pr_debug("Decremented iSCSI connection count to %hu from node:"
4258                 " %s\n", atomic_read(&sess->nconn),
4259                 sess->sess_ops->InitiatorName);
4260         /*
4261          * Make sure that if one connection fails in an non ERL=2 iSCSI
4262          * Session that they all fail.
4263          */
4264         if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4265              !atomic_read(&sess->session_logout))
4266                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4267
4268         /*
4269          * If this was not the last connection in the session, and we are
4270          * performing session reinstatement or falling back to ERL=0, call
4271          * iscsit_stop_session() without sleeping to shutdown the other
4272          * active connections.
4273          */
4274         if (atomic_read(&sess->nconn)) {
4275                 if (!atomic_read(&sess->session_reinstatement) &&
4276                     !atomic_read(&sess->session_fall_back_to_erl0)) {
4277                         spin_unlock_bh(&sess->conn_lock);
4278                         return 0;
4279                 }
4280                 if (!atomic_read(&sess->session_stop_active)) {
4281                         atomic_set(&sess->session_stop_active, 1);
4282                         spin_unlock_bh(&sess->conn_lock);
4283                         iscsit_stop_session(sess, 0, 0);
4284                         return 0;
4285                 }
4286                 spin_unlock_bh(&sess->conn_lock);
4287                 return 0;
4288         }
4289
4290         /*
4291          * If this was the last connection in the session and one of the
4292          * following is occurring:
4293          *
4294          * Session Reinstatement is not being performed, and are falling back
4295          * to ERL=0 call iscsit_close_session().
4296          *
4297          * Session Logout was requested.  iscsit_close_session() will be called
4298          * elsewhere.
4299          *
4300          * Session Continuation is not being performed, start the Time2Retain
4301          * handler and check if sleep_on_sess_wait_sem is active.
4302          */
4303         if (!atomic_read(&sess->session_reinstatement) &&
4304              atomic_read(&sess->session_fall_back_to_erl0)) {
4305                 spin_unlock_bh(&sess->conn_lock);
4306                 iscsit_close_session(sess);
4307
4308                 return 0;
4309         } else if (atomic_read(&sess->session_logout)) {
4310                 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4311                 sess->session_state = TARG_SESS_STATE_FREE;
4312                 spin_unlock_bh(&sess->conn_lock);
4313
4314                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4315                         complete(&sess->session_wait_comp);
4316
4317                 return 0;
4318         } else {
4319                 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4320                 sess->session_state = TARG_SESS_STATE_FAILED;
4321
4322                 if (!atomic_read(&sess->session_continuation)) {
4323                         spin_unlock_bh(&sess->conn_lock);
4324                         iscsit_start_time2retain_handler(sess);
4325                 } else
4326                         spin_unlock_bh(&sess->conn_lock);
4327
4328                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4329                         complete(&sess->session_wait_comp);
4330
4331                 return 0;
4332         }
4333 }
4334
4335 /*
4336  * If the iSCSI Session for the iSCSI Initiator Node exists,
4337  * forcefully shutdown the iSCSI NEXUS.
4338  */
4339 int iscsit_close_session(struct iscsi_session *sess)
4340 {
4341         struct iscsi_portal_group *tpg = sess->tpg;
4342         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4343
4344         if (atomic_read(&sess->nconn)) {
4345                 pr_err("%d connection(s) still exist for iSCSI session"
4346                         " to %s\n", atomic_read(&sess->nconn),
4347                         sess->sess_ops->InitiatorName);
4348                 BUG();
4349         }
4350
4351         spin_lock_bh(&se_tpg->session_lock);
4352         atomic_set(&sess->session_logout, 1);
4353         atomic_set(&sess->session_reinstatement, 1);
4354         iscsit_stop_time2retain_timer(sess);
4355         spin_unlock_bh(&se_tpg->session_lock);
4356
4357         /*
4358          * transport_deregister_session_configfs() will clear the
4359          * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4360          * can be setting it again with __transport_register_session() in
4361          * iscsi_post_login_handler() again after the iscsit_stop_session()
4362          * completes in iscsi_np context.
4363          */
4364         transport_deregister_session_configfs(sess->se_sess);
4365
4366         /*
4367          * If any other processes are accessing this session pointer we must
4368          * wait until they have completed.  If we are in an interrupt (the
4369          * time2retain handler) and contain and active session usage count we
4370          * restart the timer and exit.
4371          */
4372         if (!in_interrupt()) {
4373                 if (iscsit_check_session_usage_count(sess) == 1)
4374                         iscsit_stop_session(sess, 1, 1);
4375         } else {
4376                 if (iscsit_check_session_usage_count(sess) == 2) {
4377                         atomic_set(&sess->session_logout, 0);
4378                         iscsit_start_time2retain_handler(sess);
4379                         return 0;
4380                 }
4381         }
4382
4383         transport_deregister_session(sess->se_sess);
4384
4385         if (sess->sess_ops->ErrorRecoveryLevel == 2)
4386                 iscsit_free_connection_recovery_entires(sess);
4387
4388         iscsit_free_all_ooo_cmdsns(sess);
4389
4390         spin_lock_bh(&se_tpg->session_lock);
4391         pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4392         sess->session_state = TARG_SESS_STATE_FREE;
4393         pr_debug("Released iSCSI session from node: %s\n",
4394                         sess->sess_ops->InitiatorName);
4395         tpg->nsessions--;
4396         if (tpg->tpg_tiqn)
4397                 tpg->tpg_tiqn->tiqn_nsessions--;
4398
4399         pr_debug("Decremented number of active iSCSI Sessions on"
4400                 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4401
4402         spin_lock(&sess_idr_lock);
4403         idr_remove(&sess_idr, sess->session_index);
4404         spin_unlock(&sess_idr_lock);
4405
4406         kfree(sess->sess_ops);
4407         sess->sess_ops = NULL;
4408         spin_unlock_bh(&se_tpg->session_lock);
4409
4410         kfree(sess);
4411         return 0;
4412 }
4413
4414 static void iscsit_logout_post_handler_closesession(
4415         struct iscsi_conn *conn)
4416 {
4417         struct iscsi_session *sess = conn->sess;
4418         int sleep = 1;
4419         /*
4420          * Traditional iscsi/tcp will invoke this logic from TX thread
4421          * context during session logout, so clear tx_thread_active and
4422          * sleep if iscsit_close_connection() has not already occured.
4423          *
4424          * Since iser-target invokes this logic from it's own workqueue,
4425          * always sleep waiting for RX/TX thread shutdown to complete
4426          * within iscsit_close_connection().
4427          */
4428         if (!conn->conn_transport->rdma_shutdown) {
4429                 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4430                 if (!sleep)
4431                         return;
4432         }
4433
4434         atomic_set(&conn->conn_logout_remove, 0);
4435         complete(&conn->conn_logout_comp);
4436
4437         iscsit_dec_conn_usage_count(conn);
4438         iscsit_stop_session(sess, sleep, sleep);
4439         iscsit_dec_session_usage_count(sess);
4440         iscsit_close_session(sess);
4441 }
4442
4443 static void iscsit_logout_post_handler_samecid(
4444         struct iscsi_conn *conn)
4445 {
4446         int sleep = 1;
4447
4448         if (!conn->conn_transport->rdma_shutdown) {
4449                 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4450                 if (!sleep)
4451                         return;
4452         }
4453
4454         atomic_set(&conn->conn_logout_remove, 0);
4455         complete(&conn->conn_logout_comp);
4456
4457         iscsit_cause_connection_reinstatement(conn, sleep);
4458         iscsit_dec_conn_usage_count(conn);
4459 }
4460
4461 static void iscsit_logout_post_handler_diffcid(
4462         struct iscsi_conn *conn,
4463         u16 cid)
4464 {
4465         struct iscsi_conn *l_conn;
4466         struct iscsi_session *sess = conn->sess;
4467         bool conn_found = false;
4468
4469         if (!sess)
4470                 return;
4471
4472         spin_lock_bh(&sess->conn_lock);
4473         list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4474                 if (l_conn->cid == cid) {
4475                         iscsit_inc_conn_usage_count(l_conn);
4476                         conn_found = true;
4477                         break;
4478                 }
4479         }
4480         spin_unlock_bh(&sess->conn_lock);
4481
4482         if (!conn_found)
4483                 return;
4484
4485         if (l_conn->sock)
4486                 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4487
4488         spin_lock_bh(&l_conn->state_lock);
4489         pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4490         l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4491         spin_unlock_bh(&l_conn->state_lock);
4492
4493         iscsit_cause_connection_reinstatement(l_conn, 1);
4494         iscsit_dec_conn_usage_count(l_conn);
4495 }
4496
4497 /*
4498  *      Return of 0 causes the TX thread to restart.
4499  */
4500 int iscsit_logout_post_handler(
4501         struct iscsi_cmd *cmd,
4502         struct iscsi_conn *conn)
4503 {
4504         int ret = 0;
4505
4506         switch (cmd->logout_reason) {
4507         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4508                 switch (cmd->logout_response) {
4509                 case ISCSI_LOGOUT_SUCCESS:
4510                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4511                 default:
4512                         iscsit_logout_post_handler_closesession(conn);
4513                         break;
4514                 }
4515                 ret = 0;
4516                 break;
4517         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4518                 if (conn->cid == cmd->logout_cid) {
4519                         switch (cmd->logout_response) {
4520                         case ISCSI_LOGOUT_SUCCESS:
4521                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4522                         default:
4523                                 iscsit_logout_post_handler_samecid(conn);
4524                                 break;
4525                         }
4526                         ret = 0;
4527                 } else {
4528                         switch (cmd->logout_response) {
4529                         case ISCSI_LOGOUT_SUCCESS:
4530                                 iscsit_logout_post_handler_diffcid(conn,
4531                                         cmd->logout_cid);
4532                                 break;
4533                         case ISCSI_LOGOUT_CID_NOT_FOUND:
4534                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4535                         default:
4536                                 break;
4537                         }
4538                         ret = 1;
4539                 }
4540                 break;
4541         case ISCSI_LOGOUT_REASON_RECOVERY:
4542                 switch (cmd->logout_response) {
4543                 case ISCSI_LOGOUT_SUCCESS:
4544                 case ISCSI_LOGOUT_CID_NOT_FOUND:
4545                 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4546                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4547                 default:
4548                         break;
4549                 }
4550                 ret = 1;
4551                 break;
4552         default:
4553                 break;
4554
4555         }
4556         return ret;
4557 }
4558 EXPORT_SYMBOL(iscsit_logout_post_handler);
4559
4560 void iscsit_fail_session(struct iscsi_session *sess)
4561 {
4562         struct iscsi_conn *conn;
4563
4564         spin_lock_bh(&sess->conn_lock);
4565         list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4566                 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4567                 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4568         }
4569         spin_unlock_bh(&sess->conn_lock);
4570
4571         pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4572         sess->session_state = TARG_SESS_STATE_FAILED;
4573 }
4574
4575 int iscsit_free_session(struct iscsi_session *sess)
4576 {
4577         u16 conn_count = atomic_read(&sess->nconn);
4578         struct iscsi_conn *conn, *conn_tmp = NULL;
4579         int is_last;
4580
4581         spin_lock_bh(&sess->conn_lock);
4582         atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4583
4584         list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4585                         conn_list) {
4586                 if (conn_count == 0)
4587                         break;
4588
4589                 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4590                         is_last = 1;
4591                 } else {
4592                         iscsit_inc_conn_usage_count(conn_tmp);
4593                         is_last = 0;
4594                 }
4595                 iscsit_inc_conn_usage_count(conn);
4596
4597                 spin_unlock_bh(&sess->conn_lock);
4598                 iscsit_cause_connection_reinstatement(conn, 1);
4599                 spin_lock_bh(&sess->conn_lock);
4600
4601                 iscsit_dec_conn_usage_count(conn);
4602                 if (is_last == 0)
4603                         iscsit_dec_conn_usage_count(conn_tmp);
4604
4605                 conn_count--;
4606         }
4607
4608         if (atomic_read(&sess->nconn)) {
4609                 spin_unlock_bh(&sess->conn_lock);
4610                 wait_for_completion(&sess->session_wait_comp);
4611         } else
4612                 spin_unlock_bh(&sess->conn_lock);
4613
4614         iscsit_close_session(sess);
4615         return 0;
4616 }
4617
4618 void iscsit_stop_session(
4619         struct iscsi_session *sess,
4620         int session_sleep,
4621         int connection_sleep)
4622 {
4623         u16 conn_count = atomic_read(&sess->nconn);
4624         struct iscsi_conn *conn, *conn_tmp = NULL;
4625         int is_last;
4626
4627         spin_lock_bh(&sess->conn_lock);
4628         if (session_sleep)
4629                 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4630
4631         if (connection_sleep) {
4632                 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4633                                 conn_list) {
4634                         if (conn_count == 0)
4635                                 break;
4636
4637                         if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4638                                 is_last = 1;
4639                         } else {
4640                                 iscsit_inc_conn_usage_count(conn_tmp);
4641                                 is_last = 0;
4642                         }
4643                         iscsit_inc_conn_usage_count(conn);
4644
4645                         spin_unlock_bh(&sess->conn_lock);
4646                         iscsit_cause_connection_reinstatement(conn, 1);
4647                         spin_lock_bh(&sess->conn_lock);
4648
4649                         iscsit_dec_conn_usage_count(conn);
4650                         if (is_last == 0)
4651                                 iscsit_dec_conn_usage_count(conn_tmp);
4652                         conn_count--;
4653                 }
4654         } else {
4655                 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4656                         iscsit_cause_connection_reinstatement(conn, 0);
4657         }
4658
4659         if (session_sleep && atomic_read(&sess->nconn)) {
4660                 spin_unlock_bh(&sess->conn_lock);
4661                 wait_for_completion(&sess->session_wait_comp);
4662         } else
4663                 spin_unlock_bh(&sess->conn_lock);
4664 }
4665
4666 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4667 {
4668         struct iscsi_session *sess;
4669         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4670         struct se_session *se_sess, *se_sess_tmp;
4671         LIST_HEAD(free_list);
4672         int session_count = 0;
4673
4674         spin_lock_bh(&se_tpg->session_lock);
4675         if (tpg->nsessions && !force) {
4676                 spin_unlock_bh(&se_tpg->session_lock);
4677                 return -1;
4678         }
4679
4680         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4681                         sess_list) {
4682                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4683
4684                 spin_lock(&sess->conn_lock);
4685                 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4686                     atomic_read(&sess->session_logout) ||
4687                     (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4688                         spin_unlock(&sess->conn_lock);
4689                         continue;
4690                 }
4691                 atomic_set(&sess->session_reinstatement, 1);
4692                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4693                 spin_unlock(&sess->conn_lock);
4694
4695                 list_move_tail(&se_sess->sess_list, &free_list);
4696         }
4697         spin_unlock_bh(&se_tpg->session_lock);
4698
4699         list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
4700                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4701
4702                 iscsit_free_session(sess);
4703                 session_count++;
4704         }
4705
4706         pr_debug("Released %d iSCSI Session(s) from Target Portal"
4707                         " Group: %hu\n", session_count, tpg->tpgt);
4708         return 0;
4709 }
4710
4711 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4712 MODULE_VERSION("4.1.x");
4713 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4714 MODULE_LICENSE("GPL");
4715
4716 module_init(iscsi_target_init_module);
4717 module_exit(iscsi_target_cleanup_module);