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         ret = iscsi_target_setup_login_socket(np, sockaddr);
 376         if (ret != 0) {
 377                 kfree(np);
 378                 mutex_unlock(&np_lock);
 379                 return ERR_PTR(ret);
 380         }
 381
 382         np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
 383         if (IS_ERR(np->np_thread)) {
 384                 pr_err("Unable to create kthread: iscsi_np\n");
 385                 ret = PTR_ERR(np->np_thread);
 386                 kfree(np);
 387                 mutex_unlock(&np_lock);
 388                 return ERR_PTR(ret);
 389         }
 390         /*
 391          * Increment the np_exports reference count now to prevent
 392          * iscsit_del_np() below from being run while a new call to
 393          * iscsi_tpg_add_network_portal() for a matching iscsi_np is
 394          * active.  We don't need to hold np->np_thread_lock at this
 395          * point because iscsi_np has not been added to g_np_list yet.
 396          */
 397         np->np_exports = 1;
 398         np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
 399
 400         list_add_tail(&np->np_list, &g_np_list);
 401         mutex_unlock(&np_lock);
 402
 403         pr_debug("CORE[0] - Added Network Portal: %pISpc on %s\n",
 404                 &np->np_sockaddr, np->np_transport->name);
 405
 406         return np;
 407 }
 408
 409 int iscsit_reset_np_thread(
 410         struct iscsi_np *np,
 411         struct iscsi_tpg_np *tpg_np,
 412         struct iscsi_portal_group *tpg,
 413         bool shutdown)
 414 {
 415         spin_lock_bh(&np->np_thread_lock);
 416         if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
 417                 spin_unlock_bh(&np->np_thread_lock);
 418                 return 0;
 419         }
 420         np->np_thread_state = ISCSI_NP_THREAD_RESET;
 421
 422         if (np->np_thread) {
 423                 spin_unlock_bh(&np->np_thread_lock);
 424                 send_sig(SIGINT, np->np_thread, 1);
 425                 wait_for_completion(&np->np_restart_comp);
 426                 spin_lock_bh(&np->np_thread_lock);
 427         }
 428         spin_unlock_bh(&np->np_thread_lock);
 429
 430         if (tpg_np && shutdown) {
 431                 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
 432
 433                 wait_for_completion(&tpg_np->tpg_np_comp);
 434         }
 435
 436         return 0;
 437 }
 438
 439 static void iscsit_free_np(struct iscsi_np *np)
 440 {
 441         if (np->np_socket)
 442                 sock_release(np->np_socket);
 443 }
 444
 445 int iscsit_del_np(struct iscsi_np *np)
 446 {
 447         spin_lock_bh(&np->np_thread_lock);
 448         np->np_exports--;
 449         if (np->np_exports) {
 450                 np->enabled = true;
 451                 spin_unlock_bh(&np->np_thread_lock);
 452                 return 0;
 453         }
 454         np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
 455         spin_unlock_bh(&np->np_thread_lock);
 456
 457         if (np->np_thread) {
 458                 /*
 459                  * We need to send the signal to wakeup Linux/Net
 460                  * which may be sleeping in sock_accept()..
 461                  */
 462                 send_sig(SIGINT, np->np_thread, 1);
 463                 kthread_stop(np->np_thread);
 464                 np->np_thread = NULL;
 465         }
 466
 467         np->np_transport->iscsit_free_np(np);
 468
 469         mutex_lock(&np_lock);
 470         list_del(&np->np_list);
 471         mutex_unlock(&np_lock);
 472
 473         pr_debug("CORE[0] - Removed Network Portal: %pISpc on %s\n",
 474                 &np->np_sockaddr, np->np_transport->name);
 475
 476         iscsit_put_transport(np->np_transport);
 477         kfree(np);
 478         return 0;
 479 }
 480
 481 static void iscsit_get_rx_pdu(struct iscsi_conn *);
 482
 483 int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
 484 {
 485         return iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
 486 }
 487 EXPORT_SYMBOL(iscsit_queue_rsp);
 488
 489 void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
 490 {
 491         bool scsi_cmd = (cmd->iscsi_opcode == ISCSI_OP_SCSI_CMD);
 492
 493         spin_lock_bh(&conn->cmd_lock);
 494         if (!list_empty(&cmd->i_conn_node) &&
 495             !(cmd->se_cmd.transport_state & CMD_T_FABRIC_STOP))
 496                 list_del_init(&cmd->i_conn_node);
 497         spin_unlock_bh(&conn->cmd_lock);
 498
 499         __iscsit_free_cmd(cmd, scsi_cmd, true);
 500 }
 501 EXPORT_SYMBOL(iscsit_aborted_task);
 502
 503 static void iscsit_do_crypto_hash_buf(struct ahash_request *, const void *,
 504                                       u32, u32, u8 *, u8 *);
 505 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *);
 506
 507 static int
 508 iscsit_xmit_nondatain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 509                           const void *data_buf, u32 data_buf_len)
 510 {
 511         struct iscsi_hdr *hdr = (struct iscsi_hdr *)cmd->pdu;
 512         struct kvec *iov;
 513         u32 niov = 0, tx_size = ISCSI_HDR_LEN;
 514         int ret;
 515
 516         iov = &cmd->iov_misc[0];
 517         iov[niov].iov_base      = cmd->pdu;
 518         iov[niov++].iov_len     = ISCSI_HDR_LEN;
 519
 520         if (conn->conn_ops->HeaderDigest) {
 521                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
 522
 523                 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, hdr,
 524                                           ISCSI_HDR_LEN, 0, NULL,
 525                                           (u8 *)header_digest);
 526
 527                 iov[0].iov_len += ISCSI_CRC_LEN;
 528                 tx_size += ISCSI_CRC_LEN;
 529                 pr_debug("Attaching CRC32C HeaderDigest"
 530                          " to opcode 0x%x 0x%08x\n",
 531                          hdr->opcode, *header_digest);
 532         }
 533
 534         if (data_buf_len) {
 535                 u32 padding = ((-data_buf_len) & 3);
 536
 537                 iov[niov].iov_base      = (void *)data_buf;
 538                 iov[niov++].iov_len     = data_buf_len;
 539                 tx_size += data_buf_len;
 540
 541                 if (padding != 0) {
 542                         iov[niov].iov_base = &cmd->pad_bytes;
 543                         iov[niov++].iov_len = padding;
 544                         tx_size += padding;
 545                         pr_debug("Attaching %u additional"
 546                                  " padding bytes.\n", padding);
 547                 }
 548
 549                 if (conn->conn_ops->DataDigest) {
 550                         iscsit_do_crypto_hash_buf(conn->conn_tx_hash,
 551                                                   data_buf, data_buf_len,
 552                                                   padding,
 553                                                   (u8 *)&cmd->pad_bytes,
 554                                                   (u8 *)&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                                           (u8 *)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
 839         if (!cmd->conn) {
 840                 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
 841                                 cmd->init_task_tag);
 842                 return -1;
 843         }
 844         conn = cmd->conn;
 845
 846         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 847         cmd->reject_reason = reason;
 848
 849         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 850         if (!cmd->buf_ptr) {
 851                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 852                 iscsit_free_cmd(cmd, false);
 853                 return -1;
 854         }
 855
 856         if (add_to_conn) {
 857                 spin_lock_bh(&conn->cmd_lock);
 858                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 859                 spin_unlock_bh(&conn->cmd_lock);
 860         }
 861
 862         cmd->i_state = ISTATE_SEND_REJECT;
 863         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 864         /*
 865          * Perform the kref_put now if se_cmd has already been setup by
 866          * scsit_setup_scsi_cmd()
 867          */
 868         if (cmd->se_cmd.se_tfo != NULL) {
 869                 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
 870                 target_put_sess_cmd(&cmd->se_cmd);
 871         }
 872         return -1;
 873 }
 874
 875 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
 876                                  unsigned char *buf)
 877 {
 878         return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
 879 }
 880
 881 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
 882 {
 883         return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
 884 }
 885 EXPORT_SYMBOL(iscsit_reject_cmd);
 886
 887 /*
 888  * Map some portion of the allocated scatterlist to an iovec, suitable for
 889  * kernel sockets to copy data in/out.
 890  */
 891 static int iscsit_map_iovec(
 892         struct iscsi_cmd *cmd,
 893         struct kvec *iov,
 894         u32 data_offset,
 895         u32 data_length)
 896 {
 897         u32 i = 0;
 898         struct scatterlist *sg;
 899         unsigned int page_off;
 900
 901         /*
 902          * We know each entry in t_data_sg contains a page.
 903          */
 904         u32 ent = data_offset / PAGE_SIZE;
 905
 906         if (ent >= cmd->se_cmd.t_data_nents) {
 907                 pr_err("Initial page entry out-of-bounds\n");
 908                 return -1;
 909         }
 910
 911         sg = &cmd->se_cmd.t_data_sg[ent];
 912         page_off = (data_offset % PAGE_SIZE);
 913
 914         cmd->first_data_sg = sg;
 915         cmd->first_data_sg_off = page_off;
 916
 917         while (data_length) {
 918                 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
 919
 920                 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
 921                 iov[i].iov_len = cur_len;
 922
 923                 data_length -= cur_len;
 924                 page_off = 0;
 925                 sg = sg_next(sg);
 926                 i++;
 927         }
 928
 929         cmd->kmapped_nents = i;
 930
 931         return i;
 932 }
 933
 934 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
 935 {
 936         u32 i;
 937         struct scatterlist *sg;
 938
 939         sg = cmd->first_data_sg;
 940
 941         for (i = 0; i < cmd->kmapped_nents; i++)
 942                 kunmap(sg_page(&sg[i]));
 943 }
 944
 945 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
 946 {
 947         LIST_HEAD(ack_list);
 948         struct iscsi_cmd *cmd, *cmd_p;
 949
 950         conn->exp_statsn = exp_statsn;
 951
 952         if (conn->sess->sess_ops->RDMAExtensions)
 953                 return;
 954
 955         spin_lock_bh(&conn->cmd_lock);
 956         list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
 957                 spin_lock(&cmd->istate_lock);
 958                 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
 959                     iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
 960                         cmd->i_state = ISTATE_REMOVE;
 961                         spin_unlock(&cmd->istate_lock);
 962                         list_move_tail(&cmd->i_conn_node, &ack_list);
 963                         continue;
 964                 }
 965                 spin_unlock(&cmd->istate_lock);
 966         }
 967         spin_unlock_bh(&conn->cmd_lock);
 968
 969         list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
 970                 list_del_init(&cmd->i_conn_node);
 971                 iscsit_free_cmd(cmd, false);
 972         }
 973 }
 974
 975 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
 976 {
 977         u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
 978
 979         iov_count += ISCSI_IOV_DATA_BUFFER;
 980         cmd->iov_data = kcalloc(iov_count, sizeof(*cmd->iov_data), GFP_KERNEL);
 981         if (!cmd->iov_data)
 982                 return -ENOMEM;
 983
 984         cmd->orig_iov_data_count = iov_count;
 985         return 0;
 986 }
 987
 988 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 989                           unsigned char *buf)
 990 {
 991         int data_direction, payload_length;
 992         struct iscsi_scsi_req *hdr;
 993         int iscsi_task_attr;
 994         int sam_task_attr;
 995
 996         atomic_long_inc(&conn->sess->cmd_pdus);
 997
 998         hdr                     = (struct iscsi_scsi_req *) buf;
 999         payload_length          = ntoh24(hdr->dlength);
1000
1001         /* FIXME; Add checks for AdditionalHeaderSegment */
1002
1003         if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
1004             !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1005                 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
1006                                 " not set. Bad iSCSI Initiator.\n");
1007                 return iscsit_add_reject_cmd(cmd,
1008                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1009         }
1010
1011         if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
1012              (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
1013                 /*
1014                  * From RFC-3720 Section 10.3.1:
1015                  *
1016                  * "Either or both of R and W MAY be 1 when either the
1017                  *  Expected Data Transfer Length and/or Bidirectional Read
1018                  *  Expected Data Transfer Length are 0"
1019                  *
1020                  * For this case, go ahead and clear the unnecssary bits
1021                  * to avoid any confusion with ->data_direction.
1022                  */
1023                 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
1024                 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
1025
1026                 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
1027                         " set when Expected Data Transfer Length is 0 for"
1028                         " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
1029         }
1030
1031         if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
1032             !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
1033                 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
1034                         " MUST be set if Expected Data Transfer Length is not 0."
1035                         " Bad iSCSI Initiator\n");
1036                 return iscsit_add_reject_cmd(cmd,
1037                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1038         }
1039
1040         if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
1041             (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
1042                 pr_err("Bidirectional operations not supported!\n");
1043                 return iscsit_add_reject_cmd(cmd,
1044                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1045         }
1046
1047         if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1048                 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
1049                                 " Scsi Command PDU.\n");
1050                 return iscsit_add_reject_cmd(cmd,
1051                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1052         }
1053
1054         if (payload_length && !conn->sess->sess_ops->ImmediateData) {
1055                 pr_err("ImmediateData=No but DataSegmentLength=%u,"
1056                         " protocol error.\n", payload_length);
1057                 return iscsit_add_reject_cmd(cmd,
1058                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1059         }
1060
1061         if ((be32_to_cpu(hdr->data_length) == payload_length) &&
1062             (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
1063                 pr_err("Expected Data Transfer Length and Length of"
1064                         " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
1065                         " bit is not set protocol error\n");
1066                 return iscsit_add_reject_cmd(cmd,
1067                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1068         }
1069
1070         if (payload_length > be32_to_cpu(hdr->data_length)) {
1071                 pr_err("DataSegmentLength: %u is greater than"
1072                         " EDTL: %u, protocol error.\n", payload_length,
1073                                 hdr->data_length);
1074                 return iscsit_add_reject_cmd(cmd,
1075                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1076         }
1077
1078         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1079                 pr_err("DataSegmentLength: %u is greater than"
1080                         " MaxXmitDataSegmentLength: %u, protocol error.\n",
1081                         payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1082                 return iscsit_add_reject_cmd(cmd,
1083                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1084         }
1085
1086         if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
1087                 pr_err("DataSegmentLength: %u is greater than"
1088                         " FirstBurstLength: %u, protocol error.\n",
1089                         payload_length, conn->sess->sess_ops->FirstBurstLength);
1090                 return iscsit_add_reject_cmd(cmd,
1091                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1092         }
1093
1094         data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
1095                          (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
1096                           DMA_NONE;
1097
1098         cmd->data_direction = data_direction;
1099         iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
1100         /*
1101          * Figure out the SAM Task Attribute for the incoming SCSI CDB
1102          */
1103         if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
1104             (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
1105                 sam_task_attr = TCM_SIMPLE_TAG;
1106         else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
1107                 sam_task_attr = TCM_ORDERED_TAG;
1108         else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
1109                 sam_task_attr = TCM_HEAD_TAG;
1110         else if (iscsi_task_attr == ISCSI_ATTR_ACA)
1111                 sam_task_attr = TCM_ACA_TAG;
1112         else {
1113                 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
1114                         " TCM_SIMPLE_TAG\n", iscsi_task_attr);
1115                 sam_task_attr = TCM_SIMPLE_TAG;
1116         }
1117
1118         cmd->iscsi_opcode       = ISCSI_OP_SCSI_CMD;
1119         cmd->i_state            = ISTATE_NEW_CMD;
1120         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1121         cmd->immediate_data     = (payload_length) ? 1 : 0;
1122         cmd->unsolicited_data   = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
1123                                      (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
1124         if (cmd->unsolicited_data)
1125                 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
1126
1127         conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1128         if (hdr->flags & ISCSI_FLAG_CMD_READ)
1129                 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
1130         else
1131                 cmd->targ_xfer_tag = 0xFFFFFFFF;
1132         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1133         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1134         cmd->first_burst_len    = payload_length;
1135
1136         if (!conn->sess->sess_ops->RDMAExtensions &&
1137              cmd->data_direction == DMA_FROM_DEVICE) {
1138                 struct iscsi_datain_req *dr;
1139
1140                 dr = iscsit_allocate_datain_req();
1141                 if (!dr)
1142                         return iscsit_add_reject_cmd(cmd,
1143                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1144
1145                 iscsit_attach_datain_req(cmd, dr);
1146         }
1147
1148         /*
1149          * Initialize struct se_cmd descriptor from target_core_mod infrastructure
1150          */
1151         transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1152                         conn->sess->se_sess, be32_to_cpu(hdr->data_length),
1153                         cmd->data_direction, sam_task_attr,
1154                         cmd->sense_buffer + 2);
1155
1156         pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1157                 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
1158                 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1159                 conn->cid);
1160
1161         target_get_sess_cmd(&cmd->se_cmd, true);
1162
1163         cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
1164                                                      scsilun_to_int(&hdr->lun));
1165         if (cmd->sense_reason)
1166                 goto attach_cmd;
1167
1168         /* only used for printks or comparing with ->ref_task_tag */
1169         cmd->se_cmd.tag = (__force u32)cmd->init_task_tag;
1170         cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1171         if (cmd->sense_reason) {
1172                 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1173                         return iscsit_add_reject_cmd(cmd,
1174                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1175                 }
1176
1177                 goto attach_cmd;
1178         }
1179
1180         if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1181                 return iscsit_add_reject_cmd(cmd,
1182                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1183         }
1184
1185 attach_cmd:
1186         spin_lock_bh(&conn->cmd_lock);
1187         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1188         spin_unlock_bh(&conn->cmd_lock);
1189         /*
1190          * Check if we need to delay processing because of ALUA
1191          * Active/NonOptimized primary access state..
1192          */
1193         core_alua_check_nonop_delay(&cmd->se_cmd);
1194
1195         return 0;
1196 }
1197 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1198
1199 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1200 {
1201         iscsit_set_dataout_sequence_values(cmd);
1202
1203         spin_lock_bh(&cmd->dataout_timeout_lock);
1204         iscsit_start_dataout_timer(cmd, cmd->conn);
1205         spin_unlock_bh(&cmd->dataout_timeout_lock);
1206 }
1207 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1208
1209 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1210                             struct iscsi_scsi_req *hdr)
1211 {
1212         int cmdsn_ret = 0;
1213         /*
1214          * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1215          * the Immediate Bit is not set, and no Immediate
1216          * Data is attached.
1217          *
1218          * A PDU/CmdSN carrying Immediate Data can only
1219          * be processed after the DataCRC has passed.
1220          * If the DataCRC fails, the CmdSN MUST NOT
1221          * be acknowledged. (See below)
1222          */
1223         if (!cmd->immediate_data) {
1224                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1225                                         (unsigned char *)hdr, hdr->cmdsn);
1226                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1227                         return -1;
1228                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1229                         target_put_sess_cmd(&cmd->se_cmd);
1230                         return 0;
1231                 }
1232         }
1233
1234         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1235
1236         /*
1237          * If no Immediate Data is attached, it's OK to return now.
1238          */
1239         if (!cmd->immediate_data) {
1240                 if (!cmd->sense_reason && cmd->unsolicited_data)
1241                         iscsit_set_unsoliticed_dataout(cmd);
1242                 if (!cmd->sense_reason)
1243                         return 0;
1244
1245                 target_put_sess_cmd(&cmd->se_cmd);
1246                 return 0;
1247         }
1248
1249         /*
1250          * Early CHECK_CONDITIONs with ImmediateData never make it to command
1251          * execution.  These exceptions are processed in CmdSN order using
1252          * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1253          */
1254         if (cmd->sense_reason) {
1255                 if (cmd->reject_reason)
1256                         return 0;
1257
1258                 return 1;
1259         }
1260         /*
1261          * Call directly into transport_generic_new_cmd() to perform
1262          * the backend memory allocation.
1263          */
1264         cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1265         if (cmd->sense_reason)
1266                 return 1;
1267
1268         return 0;
1269 }
1270 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1271
1272 static int
1273 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1274                           bool dump_payload)
1275 {
1276         int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1277         /*
1278          * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1279          */
1280         if (dump_payload)
1281                 goto after_immediate_data;
1282         /*
1283          * Check for underflow case where both EDTL and immediate data payload
1284          * exceeds what is presented by CDB's TRANSFER LENGTH, and what has
1285          * already been set in target_cmd_size_check() as se_cmd->data_length.
1286          *
1287          * For this special case, fail the command and dump the immediate data
1288          * payload.
1289          */
1290         if (cmd->first_burst_len > cmd->se_cmd.data_length) {
1291                 cmd->sense_reason = TCM_INVALID_CDB_FIELD;
1292                 goto after_immediate_data;
1293         }
1294
1295         immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1296                                         cmd->first_burst_len);
1297 after_immediate_data:
1298         if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1299                 /*
1300                  * A PDU/CmdSN carrying Immediate Data passed
1301                  * DataCRC, check against ExpCmdSN/MaxCmdSN if
1302                  * Immediate Bit is not set.
1303                  */
1304                 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1305                                         (unsigned char *)hdr, hdr->cmdsn);
1306                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1307                         return -1;
1308
1309                 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1310                         int rc;
1311
1312                         rc = iscsit_dump_data_payload(cmd->conn,
1313                                                       cmd->first_burst_len, 1);
1314                         target_put_sess_cmd(&cmd->se_cmd);
1315                         return rc;
1316                 } else if (cmd->unsolicited_data)
1317                         iscsit_set_unsoliticed_dataout(cmd);
1318
1319         } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1320                 /*
1321                  * Immediate Data failed DataCRC and ERL>=1,
1322                  * silently drop this PDU and let the initiator
1323                  * plug the CmdSN gap.
1324                  *
1325                  * FIXME: Send Unsolicited NOPIN with reserved
1326                  * TTT here to help the initiator figure out
1327                  * the missing CmdSN, although they should be
1328                  * intelligent enough to determine the missing
1329                  * CmdSN and issue a retry to plug the sequence.
1330                  */
1331                 cmd->i_state = ISTATE_REMOVE;
1332                 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1333         } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1334                 return -1;
1335
1336         return 0;
1337 }
1338
1339 static int
1340 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1341                            unsigned char *buf)
1342 {
1343         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1344         int rc, immed_data;
1345         bool dump_payload = false;
1346
1347         rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1348         if (rc < 0)
1349                 return 0;
1350         /*
1351          * Allocation iovecs needed for struct socket operations for
1352          * traditional iSCSI block I/O.
1353          */
1354         if (iscsit_allocate_iovecs(cmd) < 0) {
1355                 return iscsit_reject_cmd(cmd,
1356                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1357         }
1358         immed_data = cmd->immediate_data;
1359
1360         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1361         if (rc < 0)
1362                 return rc;
1363         else if (rc > 0)
1364                 dump_payload = true;
1365
1366         if (!immed_data)
1367                 return 0;
1368
1369         return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1370 }
1371
1372 static u32 iscsit_do_crypto_hash_sg(
1373         struct ahash_request *hash,
1374         struct iscsi_cmd *cmd,
1375         u32 data_offset,
1376         u32 data_length,
1377         u32 padding,
1378         u8 *pad_bytes)
1379 {
1380         u32 data_crc;
1381         struct scatterlist *sg;
1382         unsigned int page_off;
1383
1384         crypto_ahash_init(hash);
1385
1386         sg = cmd->first_data_sg;
1387         page_off = cmd->first_data_sg_off;
1388
1389         while (data_length) {
1390                 u32 cur_len = min_t(u32, data_length, (sg->length - page_off));
1391
1392                 ahash_request_set_crypt(hash, sg, NULL, cur_len);
1393                 crypto_ahash_update(hash);
1394
1395                 data_length -= cur_len;
1396                 page_off = 0;
1397                 /* iscsit_map_iovec has already checked for invalid sg pointers */
1398                 sg = sg_next(sg);
1399         }
1400
1401         if (padding) {
1402                 struct scatterlist pad_sg;
1403
1404                 sg_init_one(&pad_sg, pad_bytes, padding);
1405                 ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc,
1406                                         padding);
1407                 crypto_ahash_finup(hash);
1408         } else {
1409                 ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0);
1410                 crypto_ahash_final(hash);
1411         }
1412
1413         return data_crc;
1414 }
1415
1416 static void iscsit_do_crypto_hash_buf(
1417         struct ahash_request *hash,
1418         const void *buf,
1419         u32 payload_length,
1420         u32 padding,
1421         u8 *pad_bytes,
1422         u8 *data_crc)
1423 {
1424         struct scatterlist sg[2];
1425
1426         sg_init_table(sg, ARRAY_SIZE(sg));
1427         sg_set_buf(sg, buf, payload_length);
1428         sg_set_buf(sg + 1, pad_bytes, padding);
1429
1430         ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding);
1431
1432         crypto_ahash_digest(hash);
1433 }
1434
1435 int
1436 __iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1437                            struct iscsi_cmd *cmd, u32 payload_length,
1438                            bool *success)
1439 {
1440         struct iscsi_data *hdr = buf;
1441         struct se_cmd *se_cmd;
1442         int rc;
1443
1444         /* iSCSI write */
1445         atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1446
1447         pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1448                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1449                 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1450                 payload_length, conn->cid);
1451
1452         if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1453                 pr_err("Command ITT: 0x%08x received DataOUT after"
1454                         " last DataOUT received, dumping payload\n",
1455                         cmd->init_task_tag);
1456                 return iscsit_dump_data_payload(conn, payload_length, 1);
1457         }
1458
1459         if (cmd->data_direction != DMA_TO_DEVICE) {
1460                 pr_err("Command ITT: 0x%08x received DataOUT for a"
1461                         " NON-WRITE command.\n", cmd->init_task_tag);
1462                 return iscsit_dump_data_payload(conn, payload_length, 1);
1463         }
1464         se_cmd = &cmd->se_cmd;
1465         iscsit_mod_dataout_timer(cmd);
1466
1467         if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1468                 pr_err("DataOut Offset: %u, Length %u greater than"
1469                         " iSCSI Command EDTL %u, protocol error.\n",
1470                         hdr->offset, payload_length, cmd->se_cmd.data_length);
1471                 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1472         }
1473
1474         if (cmd->unsolicited_data) {
1475                 int dump_unsolicited_data = 0;
1476
1477                 if (conn->sess->sess_ops->InitialR2T) {
1478                         pr_err("Received unexpected unsolicited data"
1479                                 " while InitialR2T=Yes, protocol error.\n");
1480                         transport_send_check_condition_and_sense(&cmd->se_cmd,
1481                                         TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1482                         return -1;
1483                 }
1484                 /*
1485                  * Special case for dealing with Unsolicited DataOUT
1486                  * and Unsupported SAM WRITE Opcodes and SE resource allocation
1487                  * failures;
1488                  */
1489
1490                 /* Something's amiss if we're not in WRITE_PENDING state... */
1491                 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1492                 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1493                         dump_unsolicited_data = 1;
1494
1495                 if (dump_unsolicited_data) {
1496                         /*
1497                          * Check if a delayed TASK_ABORTED status needs to
1498                          * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1499                          * received with the unsolicited data out.
1500                          */
1501                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1502                                 iscsit_stop_dataout_timer(cmd);
1503
1504                         transport_check_aborted_status(se_cmd,
1505                                         (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1506                         return iscsit_dump_data_payload(conn, payload_length, 1);
1507                 }
1508         } else {
1509                 /*
1510                  * For the normal solicited data path:
1511                  *
1512                  * Check for a delayed TASK_ABORTED status and dump any
1513                  * incoming data out payload if one exists.  Also, when the
1514                  * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1515                  * data out sequence, we decrement outstanding_r2ts.  Once
1516                  * outstanding_r2ts reaches zero, go ahead and send the delayed
1517                  * TASK_ABORTED status.
1518                  */
1519                 if (se_cmd->transport_state & CMD_T_ABORTED) {
1520                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1521                                 if (--cmd->outstanding_r2ts < 1) {
1522                                         iscsit_stop_dataout_timer(cmd);
1523                                         transport_check_aborted_status(
1524                                                         se_cmd, 1);
1525                                 }
1526
1527                         return iscsit_dump_data_payload(conn, payload_length, 1);
1528                 }
1529         }
1530         /*
1531          * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1532          * within-command recovery checks before receiving the payload.
1533          */
1534         rc = iscsit_check_pre_dataout(cmd, buf);
1535         if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1536                 return 0;
1537         else if (rc == DATAOUT_CANNOT_RECOVER)
1538                 return -1;
1539         *success = true;
1540         return 0;
1541 }
1542 EXPORT_SYMBOL(__iscsit_check_dataout_hdr);
1543
1544 int
1545 iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1546                          struct iscsi_cmd **out_cmd)
1547 {
1548         struct iscsi_data *hdr = buf;
1549         struct iscsi_cmd *cmd;
1550         u32 payload_length = ntoh24(hdr->dlength);
1551         int rc;
1552         bool success = false;
1553
1554         if (!payload_length) {
1555                 pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n");
1556                 return 0;
1557         }
1558
1559         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1560                 pr_err_ratelimited("DataSegmentLength: %u is greater than"
1561                         " MaxXmitDataSegmentLength: %u\n", payload_length,
1562                         conn->conn_ops->MaxXmitDataSegmentLength);
1563                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf);
1564         }
1565
1566         cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, payload_length);
1567         if (!cmd)
1568                 return 0;
1569
1570         rc = __iscsit_check_dataout_hdr(conn, buf, cmd, payload_length, &success);
1571
1572         if (success)
1573                 *out_cmd = cmd;
1574
1575         return rc;
1576 }
1577 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1578
1579 static int
1580 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1581                    struct iscsi_data *hdr)
1582 {
1583         struct kvec *iov;
1584         u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1585         u32 payload_length = ntoh24(hdr->dlength);
1586         int iov_ret, data_crc_failed = 0;
1587
1588         rx_size += payload_length;
1589         iov = &cmd->iov_data[0];
1590
1591         iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1592                                    payload_length);
1593         if (iov_ret < 0)
1594                 return -1;
1595
1596         iov_count += iov_ret;
1597
1598         padding = ((-payload_length) & 3);
1599         if (padding != 0) {
1600                 iov[iov_count].iov_base = cmd->pad_bytes;
1601                 iov[iov_count++].iov_len = padding;
1602                 rx_size += padding;
1603                 pr_debug("Receiving %u padding bytes.\n", padding);
1604         }
1605
1606         if (conn->conn_ops->DataDigest) {
1607                 iov[iov_count].iov_base = &checksum;
1608                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1609                 rx_size += ISCSI_CRC_LEN;
1610         }
1611
1612         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1613
1614         iscsit_unmap_iovec(cmd);
1615
1616         if (rx_got != rx_size)
1617                 return -1;
1618
1619         if (conn->conn_ops->DataDigest) {
1620                 u32 data_crc;
1621
1622                 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
1623                                                     be32_to_cpu(hdr->offset),
1624                                                     payload_length, padding,
1625                                                     cmd->pad_bytes);
1626
1627                 if (checksum != data_crc) {
1628                         pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1629                                 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1630                                 " does not match computed 0x%08x\n",
1631                                 hdr->itt, hdr->offset, payload_length,
1632                                 hdr->datasn, checksum, data_crc);
1633                         data_crc_failed = 1;
1634                 } else {
1635                         pr_debug("Got CRC32C DataDigest 0x%08x for"
1636                                 " %u bytes of Data Out\n", checksum,
1637                                 payload_length);
1638                 }
1639         }
1640
1641         return data_crc_failed;
1642 }
1643
1644 int
1645 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1646                              bool data_crc_failed)
1647 {
1648         struct iscsi_conn *conn = cmd->conn;
1649         int rc, ooo_cmdsn;
1650         /*
1651          * Increment post receive data and CRC values or perform
1652          * within-command recovery.
1653          */
1654         rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1655         if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1656                 return 0;
1657         else if (rc == DATAOUT_SEND_R2T) {
1658                 iscsit_set_dataout_sequence_values(cmd);
1659                 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1660         } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1661                 /*
1662                  * Handle extra special case for out of order
1663                  * Unsolicited Data Out.
1664                  */
1665                 spin_lock_bh(&cmd->istate_lock);
1666                 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1667                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1668                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1669                 spin_unlock_bh(&cmd->istate_lock);
1670
1671                 iscsit_stop_dataout_timer(cmd);
1672                 if (ooo_cmdsn)
1673                         return 0;
1674                 target_execute_cmd(&cmd->se_cmd);
1675                 return 0;
1676         } else /* DATAOUT_CANNOT_RECOVER */
1677                 return -1;
1678
1679         return 0;
1680 }
1681 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1682
1683 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1684 {
1685         struct iscsi_cmd *cmd = NULL;
1686         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1687         int rc;
1688         bool data_crc_failed = false;
1689
1690         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1691         if (rc < 0)
1692                 return 0;
1693         else if (!cmd)
1694                 return 0;
1695
1696         rc = iscsit_get_dataout(conn, cmd, hdr);
1697         if (rc < 0)
1698                 return rc;
1699         else if (rc > 0)
1700                 data_crc_failed = true;
1701
1702         return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1703 }
1704
1705 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1706                          struct iscsi_nopout *hdr)
1707 {
1708         u32 payload_length = ntoh24(hdr->dlength);
1709
1710         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1711                 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1712                 if (!cmd)
1713                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1714                                                  (unsigned char *)hdr);
1715
1716                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1717                                          (unsigned char *)hdr);
1718         }
1719
1720         if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1721                 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1722                         " not set, protocol error.\n");
1723                 if (!cmd)
1724                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1725                                                  (unsigned char *)hdr);
1726
1727                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1728                                          (unsigned char *)hdr);
1729         }
1730
1731         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1732                 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1733                         " greater than MaxXmitDataSegmentLength: %u, protocol"
1734                         " error.\n", payload_length,
1735                         conn->conn_ops->MaxXmitDataSegmentLength);
1736                 if (!cmd)
1737                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1738                                                  (unsigned char *)hdr);
1739
1740                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1741                                          (unsigned char *)hdr);
1742         }
1743
1744         pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1745                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1746                 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1747                 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1748                 payload_length);
1749         /*
1750          * This is not a response to a Unsolicited NopIN, which means
1751          * it can either be a NOPOUT ping request (with a valid ITT),
1752          * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1753          * Either way, make sure we allocate an struct iscsi_cmd, as both
1754          * can contain ping data.
1755          */
1756         if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1757                 cmd->iscsi_opcode       = ISCSI_OP_NOOP_OUT;
1758                 cmd->i_state            = ISTATE_SEND_NOPIN;
1759                 cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1760                                                 1 : 0);
1761                 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1762                 cmd->targ_xfer_tag      = 0xFFFFFFFF;
1763                 cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1764                 cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1765                 cmd->data_direction     = DMA_NONE;
1766         }
1767
1768         return 0;
1769 }
1770 EXPORT_SYMBOL(iscsit_setup_nop_out);
1771
1772 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1773                            struct iscsi_nopout *hdr)
1774 {
1775         struct iscsi_cmd *cmd_p = NULL;
1776         int cmdsn_ret = 0;
1777         /*
1778          * Initiator is expecting a NopIN ping reply..
1779          */
1780         if (hdr->itt != RESERVED_ITT) {
1781                 if (!cmd)
1782                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1783                                                 (unsigned char *)hdr);
1784
1785                 spin_lock_bh(&conn->cmd_lock);
1786                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1787                 spin_unlock_bh(&conn->cmd_lock);
1788
1789                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1790
1791                 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1792                         iscsit_add_cmd_to_response_queue(cmd, conn,
1793                                                          cmd->i_state);
1794                         return 0;
1795                 }
1796
1797                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1798                                 (unsigned char *)hdr, hdr->cmdsn);
1799                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1800                         return 0;
1801                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1802                         return -1;
1803
1804                 return 0;
1805         }
1806         /*
1807          * This was a response to a unsolicited NOPIN ping.
1808          */
1809         if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1810                 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1811                 if (!cmd_p)
1812                         return -EINVAL;
1813
1814                 iscsit_stop_nopin_response_timer(conn);
1815
1816                 cmd_p->i_state = ISTATE_REMOVE;
1817                 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1818
1819                 iscsit_start_nopin_timer(conn);
1820                 return 0;
1821         }
1822         /*
1823          * Otherwise, initiator is not expecting a NOPIN is response.
1824          * Just ignore for now.
1825          */
1826
1827         if (cmd)
1828                 iscsit_free_cmd(cmd, false);
1829
1830         return 0;
1831 }
1832 EXPORT_SYMBOL(iscsit_process_nop_out);
1833
1834 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1835                                  unsigned char *buf)
1836 {
1837         unsigned char *ping_data = NULL;
1838         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1839         struct kvec *iov = NULL;
1840         u32 payload_length = ntoh24(hdr->dlength);
1841         int ret;
1842
1843         ret = iscsit_setup_nop_out(conn, cmd, hdr);
1844         if (ret < 0)
1845                 return 0;
1846         /*
1847          * Handle NOP-OUT payload for traditional iSCSI sockets
1848          */
1849         if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1850                 u32 checksum, data_crc, padding = 0;
1851                 int niov = 0, rx_got, rx_size = payload_length;
1852
1853                 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1854                 if (!ping_data) {
1855                         ret = -1;
1856                         goto out;
1857                 }
1858
1859                 iov = &cmd->iov_misc[0];
1860                 iov[niov].iov_base      = ping_data;
1861                 iov[niov++].iov_len     = payload_length;
1862
1863                 padding = ((-payload_length) & 3);
1864                 if (padding != 0) {
1865                         pr_debug("Receiving %u additional bytes"
1866                                 " for padding.\n", padding);
1867                         iov[niov].iov_base      = &cmd->pad_bytes;
1868                         iov[niov++].iov_len     = padding;
1869                         rx_size += padding;
1870                 }
1871                 if (conn->conn_ops->DataDigest) {
1872                         iov[niov].iov_base      = &checksum;
1873                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
1874                         rx_size += ISCSI_CRC_LEN;
1875                 }
1876
1877                 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1878                 if (rx_got != rx_size) {
1879                         ret = -1;
1880                         goto out;
1881                 }
1882
1883                 if (conn->conn_ops->DataDigest) {
1884                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
1885                                         ping_data, payload_length,
1886                                         padding, cmd->pad_bytes,
1887                                         (u8 *)&data_crc);
1888
1889                         if (checksum != data_crc) {
1890                                 pr_err("Ping data CRC32C DataDigest"
1891                                 " 0x%08x does not match computed 0x%08x\n",
1892                                         checksum, data_crc);
1893                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1894                                         pr_err("Unable to recover from"
1895                                         " NOPOUT Ping DataCRC failure while in"
1896                                                 " ERL=0.\n");
1897                                         ret = -1;
1898                                         goto out;
1899                                 } else {
1900                                         /*
1901                                          * Silently drop this PDU and let the
1902                                          * initiator plug the CmdSN gap.
1903                                          */
1904                                         pr_debug("Dropping NOPOUT"
1905                                         " Command CmdSN: 0x%08x due to"
1906                                         " DataCRC error.\n", hdr->cmdsn);
1907                                         ret = 0;
1908                                         goto out;
1909                                 }
1910                         } else {
1911                                 pr_debug("Got CRC32C DataDigest"
1912                                 " 0x%08x for %u bytes of ping data.\n",
1913                                         checksum, payload_length);
1914                         }
1915                 }
1916
1917                 ping_data[payload_length] = '\0';
1918                 /*
1919                  * Attach ping data to struct iscsi_cmd->buf_ptr.
1920                  */
1921                 cmd->buf_ptr = ping_data;
1922                 cmd->buf_ptr_size = payload_length;
1923
1924                 pr_debug("Got %u bytes of NOPOUT ping"
1925                         " data.\n", payload_length);
1926                 pr_debug("Ping Data: \"%s\"\n", ping_data);
1927         }
1928
1929         return iscsit_process_nop_out(conn, cmd, hdr);
1930 out:
1931         if (cmd)
1932                 iscsit_free_cmd(cmd, false);
1933
1934         kfree(ping_data);
1935         return ret;
1936 }
1937
1938 static enum tcm_tmreq_table iscsit_convert_tmf(u8 iscsi_tmf)
1939 {
1940         switch (iscsi_tmf) {
1941         case ISCSI_TM_FUNC_ABORT_TASK:
1942                 return TMR_ABORT_TASK;
1943         case ISCSI_TM_FUNC_ABORT_TASK_SET:
1944                 return TMR_ABORT_TASK_SET;
1945         case ISCSI_TM_FUNC_CLEAR_ACA:
1946                 return TMR_CLEAR_ACA;
1947         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1948                 return TMR_CLEAR_TASK_SET;
1949         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1950                 return TMR_LUN_RESET;
1951         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1952                 return TMR_TARGET_WARM_RESET;
1953         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1954                 return TMR_TARGET_COLD_RESET;
1955         default:
1956                 return TMR_UNKNOWN;
1957         }
1958 }
1959
1960 int
1961 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1962                            unsigned char *buf)
1963 {
1964         struct se_tmr_req *se_tmr;
1965         struct iscsi_tmr_req *tmr_req;
1966         struct iscsi_tm *hdr;
1967         int out_of_order_cmdsn = 0, ret;
1968         bool sess_ref = false;
1969         u8 function, tcm_function = TMR_UNKNOWN;
1970
1971         hdr                     = (struct iscsi_tm *) buf;
1972         hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1973         function = hdr->flags;
1974
1975         pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1976                 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1977                 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1978                 hdr->rtt, hdr->refcmdsn, conn->cid);
1979
1980         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1981             ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1982              hdr->rtt != RESERVED_ITT)) {
1983                 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1984                 hdr->rtt = RESERVED_ITT;
1985         }
1986
1987         if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1988                         !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1989                 pr_err("Task Management Request TASK_REASSIGN not"
1990                         " issued as immediate command, bad iSCSI Initiator"
1991                                 "implementation\n");
1992                 return iscsit_add_reject_cmd(cmd,
1993                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1994         }
1995         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1996             be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1997                 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1998
1999         cmd->data_direction = DMA_NONE;
2000         cmd->tmr_req = kzalloc(sizeof(*cmd->tmr_req), GFP_KERNEL);
2001         if (!cmd->tmr_req)
2002                 return iscsit_add_reject_cmd(cmd,
2003                                              ISCSI_REASON_BOOKMARK_NO_RESOURCES,
2004                                              buf);
2005
2006         /*
2007          * TASK_REASSIGN for ERL=2 / connection stays inside of
2008          * LIO-Target $FABRIC_MOD
2009          */
2010         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2011                 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
2012                                       conn->sess->se_sess, 0, DMA_NONE,
2013                                       TCM_SIMPLE_TAG, cmd->sense_buffer + 2);
2014
2015                 target_get_sess_cmd(&cmd->se_cmd, true);
2016                 sess_ref = true;
2017                 tcm_function = iscsit_convert_tmf(function);
2018                 if (tcm_function == TMR_UNKNOWN) {
2019                         pr_err("Unknown iSCSI TMR Function:"
2020                                " 0x%02x\n", function);
2021                         return iscsit_add_reject_cmd(cmd,
2022                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2023                 }
2024         }
2025         ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function,
2026                                  GFP_KERNEL);
2027         if (ret < 0)
2028                 return iscsit_add_reject_cmd(cmd,
2029                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2030
2031         cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
2032
2033         cmd->iscsi_opcode       = ISCSI_OP_SCSI_TMFUNC;
2034         cmd->i_state            = ISTATE_SEND_TASKMGTRSP;
2035         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2036         cmd->init_task_tag      = hdr->itt;
2037         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2038         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2039         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2040         se_tmr                  = cmd->se_cmd.se_tmr_req;
2041         tmr_req                 = cmd->tmr_req;
2042         /*
2043          * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
2044          */
2045         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2046                 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
2047                                                scsilun_to_int(&hdr->lun));
2048                 if (ret < 0) {
2049                         se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
2050                         goto attach;
2051                 }
2052         }
2053
2054         switch (function) {
2055         case ISCSI_TM_FUNC_ABORT_TASK:
2056                 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
2057                 if (se_tmr->response)
2058                         goto attach;
2059                 break;
2060         case ISCSI_TM_FUNC_ABORT_TASK_SET:
2061         case ISCSI_TM_FUNC_CLEAR_ACA:
2062         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
2063         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
2064                 break;
2065         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2066                 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
2067                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2068                         goto attach;
2069                 }
2070                 break;
2071         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2072                 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
2073                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2074                         goto attach;
2075                 }
2076                 break;
2077         case ISCSI_TM_FUNC_TASK_REASSIGN:
2078                 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
2079                 /*
2080                  * Perform sanity checks on the ExpDataSN only if the
2081                  * TASK_REASSIGN was successful.
2082                  */
2083                 if (se_tmr->response)
2084                         break;
2085
2086                 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
2087                         return iscsit_add_reject_cmd(cmd,
2088                                         ISCSI_REASON_BOOKMARK_INVALID, buf);
2089                 break;
2090         default:
2091                 pr_err("Unknown TMR function: 0x%02x, protocol"
2092                         " error.\n", function);
2093                 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
2094                 goto attach;
2095         }
2096
2097         if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
2098             (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
2099                 se_tmr->call_transport = 1;
2100 attach:
2101         spin_lock_bh(&conn->cmd_lock);
2102         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2103         spin_unlock_bh(&conn->cmd_lock);
2104
2105         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2106                 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2107                 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
2108                         out_of_order_cmdsn = 1;
2109                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2110                         return 0;
2111                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2112                         return -1;
2113         }
2114         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2115
2116         if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
2117                 return 0;
2118         /*
2119          * Found the referenced task, send to transport for processing.
2120          */
2121         if (se_tmr->call_transport)
2122                 return transport_generic_handle_tmr(&cmd->se_cmd);
2123
2124         /*
2125          * Could not find the referenced LUN, task, or Task Management
2126          * command not authorized or supported.  Change state and
2127          * let the tx_thread send the response.
2128          *
2129          * For connection recovery, this is also the default action for
2130          * TMR TASK_REASSIGN.
2131          */
2132         if (sess_ref) {
2133                 pr_debug("Handle TMR, using sess_ref=true check\n");
2134                 target_put_sess_cmd(&cmd->se_cmd);
2135         }
2136
2137         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2138         return 0;
2139 }
2140 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
2141
2142 /* #warning FIXME: Support Text Command parameters besides SendTargets */
2143 int
2144 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2145                       struct iscsi_text *hdr)
2146 {
2147         u32 payload_length = ntoh24(hdr->dlength);
2148
2149         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
2150                 pr_err("Unable to accept text parameter length: %u"
2151                         "greater than MaxXmitDataSegmentLength %u.\n",
2152                        payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
2153                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2154                                          (unsigned char *)hdr);
2155         }
2156
2157         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
2158              (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
2159                 pr_err("Multi sequence text commands currently not supported\n");
2160                 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
2161                                         (unsigned char *)hdr);
2162         }
2163
2164         pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
2165                 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
2166                 hdr->exp_statsn, payload_length);
2167
2168         cmd->iscsi_opcode       = ISCSI_OP_TEXT;
2169         cmd->i_state            = ISTATE_SEND_TEXTRSP;
2170         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2171         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2172         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2173         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2174         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2175         cmd->data_direction     = DMA_NONE;
2176         cmd->text_in_ptr        = NULL;
2177
2178         return 0;
2179 }
2180 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2181
2182 int
2183 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2184                         struct iscsi_text *hdr)
2185 {
2186         unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2187         int cmdsn_ret;
2188
2189         if (!text_in) {
2190                 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2191                 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2192                         pr_err("Unable to locate text_in buffer for sendtargets"
2193                                " discovery\n");
2194                         goto reject;
2195                 }
2196                 goto empty_sendtargets;
2197         }
2198         if (strncmp("SendTargets", text_in, 11) != 0) {
2199                 pr_err("Received Text Data that is not"
2200                         " SendTargets, cannot continue.\n");
2201                 goto reject;
2202         }
2203         text_ptr = strchr(text_in, '=');
2204         if (!text_ptr) {
2205                 pr_err("No \"=\" separator found in Text Data,"
2206                         "  cannot continue.\n");
2207                 goto reject;
2208         }
2209         if (!strncmp("=All", text_ptr, 4)) {
2210                 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2211         } else if (!strncmp("=iqn.", text_ptr, 5) ||
2212                    !strncmp("=eui.", text_ptr, 5)) {
2213                 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2214         } else {
2215                 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2216                 goto reject;
2217         }
2218
2219         spin_lock_bh(&conn->cmd_lock);
2220         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2221         spin_unlock_bh(&conn->cmd_lock);
2222
2223 empty_sendtargets:
2224         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2225
2226         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2227                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2228                                 (unsigned char *)hdr, hdr->cmdsn);
2229                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2230                         return -1;
2231
2232                 return 0;
2233         }
2234
2235         return iscsit_execute_cmd(cmd, 0);
2236
2237 reject:
2238         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2239                                  (unsigned char *)hdr);
2240 }
2241 EXPORT_SYMBOL(iscsit_process_text_cmd);
2242
2243 static int
2244 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2245                        unsigned char *buf)
2246 {
2247         struct iscsi_text *hdr = (struct iscsi_text *)buf;
2248         char *text_in = NULL;
2249         u32 payload_length = ntoh24(hdr->dlength);
2250         int rx_size, rc;
2251
2252         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2253         if (rc < 0)
2254                 return 0;
2255
2256         rx_size = payload_length;
2257         if (payload_length) {
2258                 u32 checksum = 0, data_crc = 0;
2259                 u32 padding = 0, pad_bytes = 0;
2260                 int niov = 0, rx_got;
2261                 struct kvec iov[3];
2262
2263                 text_in = kzalloc(payload_length, GFP_KERNEL);
2264                 if (!text_in)
2265                         goto reject;
2266
2267                 cmd->text_in_ptr = text_in;
2268
2269                 memset(iov, 0, 3 * sizeof(struct kvec));
2270                 iov[niov].iov_base      = text_in;
2271                 iov[niov++].iov_len     = payload_length;
2272
2273                 padding = ((-payload_length) & 3);
2274                 if (padding != 0) {
2275                         iov[niov].iov_base = &pad_bytes;
2276                         iov[niov++].iov_len  = padding;
2277                         rx_size += padding;
2278                         pr_debug("Receiving %u additional bytes"
2279                                         " for padding.\n", padding);
2280                 }
2281                 if (conn->conn_ops->DataDigest) {
2282                         iov[niov].iov_base      = &checksum;
2283                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
2284                         rx_size += ISCSI_CRC_LEN;
2285                 }
2286
2287                 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2288                 if (rx_got != rx_size)
2289                         goto reject;
2290
2291                 if (conn->conn_ops->DataDigest) {
2292                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
2293                                         text_in, payload_length,
2294                                         padding, (u8 *)&pad_bytes,
2295                                         (u8 *)&data_crc);
2296
2297                         if (checksum != data_crc) {
2298                                 pr_err("Text data CRC32C DataDigest"
2299                                         " 0x%08x does not match computed"
2300                                         " 0x%08x\n", checksum, data_crc);
2301                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2302                                         pr_err("Unable to recover from"
2303                                         " Text Data digest failure while in"
2304                                                 " ERL=0.\n");
2305                                         goto reject;
2306                                 } else {
2307                                         /*
2308                                          * Silently drop this PDU and let the
2309                                          * initiator plug the CmdSN gap.
2310                                          */
2311                                         pr_debug("Dropping Text"
2312                                         " Command CmdSN: 0x%08x due to"
2313                                         " DataCRC error.\n", hdr->cmdsn);
2314                                         kfree(text_in);
2315                                         return 0;
2316                                 }
2317                         } else {
2318                                 pr_debug("Got CRC32C DataDigest"
2319                                         " 0x%08x for %u bytes of text data.\n",
2320                                                 checksum, payload_length);
2321                         }
2322                 }
2323                 text_in[payload_length - 1] = '\0';
2324                 pr_debug("Successfully read %d bytes of text"
2325                                 " data.\n", payload_length);
2326         }
2327
2328         return iscsit_process_text_cmd(conn, cmd, hdr);
2329
2330 reject:
2331         kfree(cmd->text_in_ptr);
2332         cmd->text_in_ptr = NULL;
2333         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2334 }
2335
2336 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2337 {
2338         struct iscsi_conn *conn_p;
2339         struct iscsi_session *sess = conn->sess;
2340
2341         pr_debug("Received logout request CLOSESESSION on CID: %hu"
2342                 " for SID: %u.\n", conn->cid, conn->sess->sid);
2343
2344         atomic_set(&sess->session_logout, 1);
2345         atomic_set(&conn->conn_logout_remove, 1);
2346         conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2347
2348         iscsit_inc_conn_usage_count(conn);
2349         iscsit_inc_session_usage_count(sess);
2350
2351         spin_lock_bh(&sess->conn_lock);
2352         list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2353                 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2354                         continue;
2355
2356                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2357                 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2358         }
2359         spin_unlock_bh(&sess->conn_lock);
2360
2361         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2362
2363         return 0;
2364 }
2365
2366 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2367 {
2368         struct iscsi_conn *l_conn;
2369         struct iscsi_session *sess = conn->sess;
2370
2371         pr_debug("Received logout request CLOSECONNECTION for CID:"
2372                 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2373
2374         /*
2375          * A Logout Request with a CLOSECONNECTION reason code for a CID
2376          * can arrive on a connection with a differing CID.
2377          */
2378         if (conn->cid == cmd->logout_cid) {
2379                 spin_lock_bh(&conn->state_lock);
2380                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2381                 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2382
2383                 atomic_set(&conn->conn_logout_remove, 1);
2384                 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2385                 iscsit_inc_conn_usage_count(conn);
2386
2387                 spin_unlock_bh(&conn->state_lock);
2388         } else {
2389                 /*
2390                  * Handle all different cid CLOSECONNECTION requests in
2391                  * iscsit_logout_post_handler_diffcid() as to give enough
2392                  * time for any non immediate command's CmdSN to be
2393                  * acknowledged on the connection in question.
2394                  *
2395                  * Here we simply make sure the CID is still around.
2396                  */
2397                 l_conn = iscsit_get_conn_from_cid(sess,
2398                                 cmd->logout_cid);
2399                 if (!l_conn) {
2400                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2401                         iscsit_add_cmd_to_response_queue(cmd, conn,
2402                                         cmd->i_state);
2403                         return 0;
2404                 }
2405
2406                 iscsit_dec_conn_usage_count(l_conn);
2407         }
2408
2409         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2410
2411         return 0;
2412 }
2413
2414 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2415 {
2416         struct iscsi_session *sess = conn->sess;
2417
2418         pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2419                 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2420
2421         if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2422                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2423                         " while ERL!=2.\n");
2424                 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2425                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2426                 return 0;
2427         }
2428
2429         if (conn->cid == cmd->logout_cid) {
2430                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2431                         " with CID: %hu on CID: %hu, implementation error.\n",
2432                                 cmd->logout_cid, conn->cid);
2433                 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2434                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2435                 return 0;
2436         }
2437
2438         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2439
2440         return 0;
2441 }
2442
2443 int
2444 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2445                         unsigned char *buf)
2446 {
2447         int cmdsn_ret, logout_remove = 0;
2448         u8 reason_code = 0;
2449         struct iscsi_logout *hdr;
2450         struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2451
2452         hdr                     = (struct iscsi_logout *) buf;
2453         reason_code             = (hdr->flags & 0x7f);
2454
2455         if (tiqn) {
2456                 spin_lock(&tiqn->logout_stats.lock);
2457                 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2458                         tiqn->logout_stats.normal_logouts++;
2459                 else
2460                         tiqn->logout_stats.abnormal_logouts++;
2461                 spin_unlock(&tiqn->logout_stats.lock);
2462         }
2463
2464         pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2465                 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2466                 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2467                 hdr->cid, conn->cid);
2468
2469         if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2470                 pr_err("Received logout request on connection that"
2471                         " is not in logged in state, ignoring request.\n");
2472                 iscsit_free_cmd(cmd, false);
2473                 return 0;
2474         }
2475
2476         cmd->iscsi_opcode       = ISCSI_OP_LOGOUT;
2477         cmd->i_state            = ISTATE_SEND_LOGOUTRSP;
2478         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2479         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2480         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2481         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2482         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2483         cmd->logout_cid         = be16_to_cpu(hdr->cid);
2484         cmd->logout_reason      = reason_code;
2485         cmd->data_direction     = DMA_NONE;
2486
2487         /*
2488          * We need to sleep in these cases (by returning 1) until the Logout
2489          * Response gets sent in the tx thread.
2490          */
2491         if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2492            ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2493             be16_to_cpu(hdr->cid) == conn->cid))
2494                 logout_remove = 1;
2495
2496         spin_lock_bh(&conn->cmd_lock);
2497         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2498         spin_unlock_bh(&conn->cmd_lock);
2499
2500         if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2501                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2502
2503         /*
2504          * Immediate commands are executed, well, immediately.
2505          * Non-Immediate Logout Commands are executed in CmdSN order.
2506          */
2507         if (cmd->immediate_cmd) {
2508                 int ret = iscsit_execute_cmd(cmd, 0);
2509
2510                 if (ret < 0)
2511                         return ret;
2512         } else {
2513                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2514                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2515                         logout_remove = 0;
2516                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2517                         return -1;
2518         }
2519
2520         return logout_remove;
2521 }
2522 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2523
2524 int iscsit_handle_snack(
2525         struct iscsi_conn *conn,
2526         unsigned char *buf)
2527 {
2528         struct iscsi_snack *hdr;
2529
2530         hdr                     = (struct iscsi_snack *) buf;
2531         hdr->flags              &= ~ISCSI_FLAG_CMD_FINAL;
2532
2533         pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2534                 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2535                 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2536                         hdr->begrun, hdr->runlength, conn->cid);
2537
2538         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2539                 pr_err("Initiator sent SNACK request while in"
2540                         " ErrorRecoveryLevel=0.\n");
2541                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2542                                          buf);
2543         }
2544         /*
2545          * SNACK_DATA and SNACK_R2T are both 0,  so check which function to
2546          * call from inside iscsi_send_recovery_datain_or_r2t().
2547          */
2548         switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2549         case 0:
2550                 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2551                         hdr->itt,
2552                         be32_to_cpu(hdr->ttt),
2553                         be32_to_cpu(hdr->begrun),
2554                         be32_to_cpu(hdr->runlength));
2555         case ISCSI_FLAG_SNACK_TYPE_STATUS:
2556                 return iscsit_handle_status_snack(conn, hdr->itt,
2557                         be32_to_cpu(hdr->ttt),
2558                         be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2559         case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2560                 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2561                         be32_to_cpu(hdr->begrun),
2562                         be32_to_cpu(hdr->runlength));
2563         case ISCSI_FLAG_SNACK_TYPE_RDATA:
2564                 /* FIXME: Support R-Data SNACK */
2565                 pr_err("R-Data SNACK Not Supported.\n");
2566                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2567                                          buf);
2568         default:
2569                 pr_err("Unknown SNACK type 0x%02x, protocol"
2570                         " error.\n", hdr->flags & 0x0f);
2571                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2572                                          buf);
2573         }
2574
2575         return 0;
2576 }
2577 EXPORT_SYMBOL(iscsit_handle_snack);
2578
2579 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2580 {
2581         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2582             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2583                 wait_for_completion_interruptible_timeout(
2584                                         &conn->rx_half_close_comp,
2585                                         ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2586         }
2587 }
2588
2589 static int iscsit_handle_immediate_data(
2590         struct iscsi_cmd *cmd,
2591         struct iscsi_scsi_req *hdr,
2592         u32 length)
2593 {
2594         int iov_ret, rx_got = 0, rx_size = 0;
2595         u32 checksum, iov_count = 0, padding = 0;
2596         struct iscsi_conn *conn = cmd->conn;
2597         struct kvec *iov;
2598
2599         iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2600         if (iov_ret < 0)
2601                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2602
2603         rx_size = length;
2604         iov_count = iov_ret;
2605         iov = &cmd->iov_data[0];
2606
2607         padding = ((-length) & 3);
2608         if (padding != 0) {
2609                 iov[iov_count].iov_base = cmd->pad_bytes;
2610                 iov[iov_count++].iov_len = padding;
2611                 rx_size += padding;
2612         }
2613
2614         if (conn->conn_ops->DataDigest) {
2615                 iov[iov_count].iov_base         = &checksum;
2616                 iov[iov_count++].iov_len        = ISCSI_CRC_LEN;
2617                 rx_size += ISCSI_CRC_LEN;
2618         }
2619
2620         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2621
2622         iscsit_unmap_iovec(cmd);
2623
2624         if (rx_got != rx_size) {
2625                 iscsit_rx_thread_wait_for_tcp(conn);
2626                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2627         }
2628
2629         if (conn->conn_ops->DataDigest) {
2630                 u32 data_crc;
2631
2632                 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
2633                                                     cmd->write_data_done, length, padding,
2634                                                     cmd->pad_bytes);
2635
2636                 if (checksum != data_crc) {
2637                         pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2638                                 " does not match computed 0x%08x\n", checksum,
2639                                 data_crc);
2640
2641                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2642                                 pr_err("Unable to recover from"
2643                                         " Immediate Data digest failure while"
2644                                         " in ERL=0.\n");
2645                                 iscsit_reject_cmd(cmd,
2646                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2647                                                 (unsigned char *)hdr);
2648                                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2649                         } else {
2650                                 iscsit_reject_cmd(cmd,
2651                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2652                                                 (unsigned char *)hdr);
2653                                 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2654                         }
2655                 } else {
2656                         pr_debug("Got CRC32C DataDigest 0x%08x for"
2657                                 " %u bytes of Immediate Data\n", checksum,
2658                                 length);
2659                 }
2660         }
2661
2662         cmd->write_data_done += length;
2663
2664         if (cmd->write_data_done == cmd->se_cmd.data_length) {
2665                 spin_lock_bh(&cmd->istate_lock);
2666                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2667                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2668                 spin_unlock_bh(&cmd->istate_lock);
2669         }
2670
2671         return IMMEDIATE_DATA_NORMAL_OPERATION;
2672 }
2673
2674 /*
2675  *      Called with sess->conn_lock held.
2676  */
2677 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2678         with active network interface */
2679 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2680 {
2681         struct iscsi_cmd *cmd;
2682         struct iscsi_conn *conn_p;
2683         bool found = false;
2684
2685         /*
2686          * Only send a Asynchronous Message on connections whos network
2687          * interface is still functional.
2688          */
2689         list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2690                 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2691                         iscsit_inc_conn_usage_count(conn_p);
2692                         found = true;
2693                         break;
2694                 }
2695         }
2696
2697         if (!found)
2698                 return;
2699
2700         cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2701         if (!cmd) {
2702                 iscsit_dec_conn_usage_count(conn_p);
2703                 return;
2704         }
2705
2706         cmd->logout_cid = conn->cid;
2707         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2708         cmd->i_state = ISTATE_SEND_ASYNCMSG;
2709
2710         spin_lock_bh(&conn_p->cmd_lock);
2711         list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2712         spin_unlock_bh(&conn_p->cmd_lock);
2713
2714         iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2715         iscsit_dec_conn_usage_count(conn_p);
2716 }
2717
2718 static int iscsit_send_conn_drop_async_message(
2719         struct iscsi_cmd *cmd,
2720         struct iscsi_conn *conn)
2721 {
2722         struct iscsi_async *hdr;
2723
2724         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2725
2726         hdr                     = (struct iscsi_async *) cmd->pdu;
2727         hdr->opcode             = ISCSI_OP_ASYNC_EVENT;
2728         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
2729         cmd->init_task_tag      = RESERVED_ITT;
2730         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2731         put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2732         cmd->stat_sn            = conn->stat_sn++;
2733         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2734         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2735         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2736         hdr->async_event        = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2737         hdr->param1             = cpu_to_be16(cmd->logout_cid);
2738         hdr->param2             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2739         hdr->param3             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2740
2741         pr_debug("Sending Connection Dropped Async Message StatSN:"
2742                 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2743                         cmd->logout_cid, conn->cid);
2744
2745         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2746 }
2747
2748 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2749 {
2750         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2751             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2752                 wait_for_completion_interruptible_timeout(
2753                                         &conn->tx_half_close_comp,
2754                                         ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2755         }
2756 }
2757
2758 void
2759 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2760                         struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2761                         bool set_statsn)
2762 {
2763         hdr->opcode             = ISCSI_OP_SCSI_DATA_IN;
2764         hdr->flags              = datain->flags;
2765         if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2766                 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2767                         hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2768                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2769                 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2770                         hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2771                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2772                 }
2773         }
2774         hton24(hdr->dlength, datain->length);
2775         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2776                 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2777                                 (struct scsi_lun *)&hdr->lun);
2778         else
2779                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2780
2781         hdr->itt                = cmd->init_task_tag;
2782
2783         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2784                 hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2785         else
2786                 hdr->ttt                = cpu_to_be32(0xFFFFFFFF);
2787         if (set_statsn)
2788                 hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2789         else
2790                 hdr->statsn             = cpu_to_be32(0xFFFFFFFF);
2791
2792         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2793         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2794         hdr->datasn             = cpu_to_be32(datain->data_sn);
2795         hdr->offset             = cpu_to_be32(datain->offset);
2796
2797         pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2798                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2799                 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2800                 ntohl(hdr->offset), datain->length, conn->cid);
2801 }
2802 EXPORT_SYMBOL(iscsit_build_datain_pdu);
2803
2804 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2805 {
2806         struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2807         struct iscsi_datain datain;
2808         struct iscsi_datain_req *dr;
2809         int eodr = 0, ret;
2810         bool set_statsn = false;
2811
2812         memset(&datain, 0, sizeof(struct iscsi_datain));
2813         dr = iscsit_get_datain_values(cmd, &datain);
2814         if (!dr) {
2815                 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2816                                 cmd->init_task_tag);
2817                 return -1;
2818         }
2819         /*
2820          * Be paranoid and double check the logic for now.
2821          */
2822         if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2823                 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2824                         " datain.length: %u exceeds cmd->data_length: %u\n",
2825                         cmd->init_task_tag, datain.offset, datain.length,
2826                         cmd->se_cmd.data_length);
2827                 return -1;
2828         }
2829
2830         atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2831         /*
2832          * Special case for successfully execution w/ both DATAIN
2833          * and Sense Data.
2834          */
2835         if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2836             (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2837                 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2838         else {
2839                 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2840                     (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2841                         iscsit_increment_maxcmdsn(cmd, conn->sess);
2842                         cmd->stat_sn = conn->stat_sn++;
2843                         set_statsn = true;
2844                 } else if (dr->dr_complete ==
2845                            DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2846                         set_statsn = true;
2847         }
2848
2849         iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2850
2851         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0);
2852         if (ret < 0)
2853                 return ret;
2854
2855         if (dr->dr_complete) {
2856                 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2857                                 2 : 1;
2858                 iscsit_free_datain_req(cmd, dr);
2859         }
2860
2861         return eodr;
2862 }
2863
2864 int
2865 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2866                         struct iscsi_logout_rsp *hdr)
2867 {
2868         struct iscsi_conn *logout_conn = NULL;
2869         struct iscsi_conn_recovery *cr = NULL;
2870         struct iscsi_session *sess = conn->sess;
2871         /*
2872          * The actual shutting down of Sessions and/or Connections
2873          * for CLOSESESSION and CLOSECONNECTION Logout Requests
2874          * is done in scsi_logout_post_handler().
2875          */
2876         switch (cmd->logout_reason) {
2877         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2878                 pr_debug("iSCSI session logout successful, setting"
2879                         " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2880                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2881                 break;
2882         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2883                 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2884                         break;
2885                 /*
2886                  * For CLOSECONNECTION logout requests carrying
2887                  * a matching logout CID -> local CID, the reference
2888                  * for the local CID will have been incremented in
2889                  * iscsi_logout_closeconnection().
2890                  *
2891                  * For CLOSECONNECTION logout requests carrying
2892                  * a different CID than the connection it arrived
2893                  * on, the connection responding to cmd->logout_cid
2894                  * is stopped in iscsit_logout_post_handler_diffcid().
2895                  */
2896
2897                 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2898                         " successful.\n", cmd->logout_cid, conn->cid);
2899                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2900                 break;
2901         case ISCSI_LOGOUT_REASON_RECOVERY:
2902                 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2903                     (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2904                         break;
2905                 /*
2906                  * If the connection is still active from our point of view
2907                  * force connection recovery to occur.
2908                  */
2909                 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2910                                 cmd->logout_cid);
2911                 if (logout_conn) {
2912                         iscsit_connection_reinstatement_rcfr(logout_conn);
2913                         iscsit_dec_conn_usage_count(logout_conn);
2914                 }
2915
2916                 cr = iscsit_get_inactive_connection_recovery_entry(
2917                                 conn->sess, cmd->logout_cid);
2918                 if (!cr) {
2919                         pr_err("Unable to locate CID: %hu for"
2920                         " REMOVECONNFORRECOVERY Logout Request.\n",
2921                                 cmd->logout_cid);
2922                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2923                         break;
2924                 }
2925
2926                 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2927
2928                 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2929                         " for recovery for CID: %hu on CID: %hu successful.\n",
2930                                 cmd->logout_cid, conn->cid);
2931                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2932                 break;
2933         default:
2934                 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2935                                 cmd->logout_reason);
2936                 return -1;
2937         }
2938
2939         hdr->opcode             = ISCSI_OP_LOGOUT_RSP;
2940         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2941         hdr->response           = cmd->logout_response;
2942         hdr->itt                = cmd->init_task_tag;
2943         cmd->stat_sn            = conn->stat_sn++;
2944         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2945
2946         iscsit_increment_maxcmdsn(cmd, conn->sess);
2947         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2948         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2949
2950         pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2951                 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2952                 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2953                 cmd->logout_cid, conn->cid);
2954
2955         return 0;
2956 }
2957 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2958
2959 static int
2960 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2961 {
2962         int rc;
2963
2964         rc = iscsit_build_logout_rsp(cmd, conn,
2965                         (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2966         if (rc < 0)
2967                 return rc;
2968
2969         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2970 }
2971
2972 void
2973 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2974                        struct iscsi_nopin *hdr, bool nopout_response)
2975 {
2976         hdr->opcode             = ISCSI_OP_NOOP_IN;
2977         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2978         hton24(hdr->dlength, cmd->buf_ptr_size);
2979         if (nopout_response)
2980                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2981         hdr->itt                = cmd->init_task_tag;
2982         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2983         cmd->stat_sn            = (nopout_response) ? conn->stat_sn++ :
2984                                   conn->stat_sn;
2985         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2986
2987         if (nopout_response)
2988                 iscsit_increment_maxcmdsn(cmd, conn->sess);
2989
2990         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2991         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2992
2993         pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2994                 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2995                 "Solicited" : "Unsolicited", cmd->init_task_tag,
2996                 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2997 }
2998 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2999
3000 /*
3001  *      Unsolicited NOPIN, either requesting a response or not.
3002  */
3003 static int iscsit_send_unsolicited_nopin(
3004         struct iscsi_cmd *cmd,
3005         struct iscsi_conn *conn,
3006         int want_response)
3007 {
3008         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3009         int ret;
3010
3011         iscsit_build_nopin_rsp(cmd, conn, hdr, false);
3012
3013         pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
3014                 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
3015
3016         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3017         if (ret < 0)
3018                 return ret;
3019
3020         spin_lock_bh(&cmd->istate_lock);
3021         cmd->i_state = want_response ?
3022                 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
3023         spin_unlock_bh(&cmd->istate_lock);
3024
3025         return 0;
3026 }
3027
3028 static int
3029 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3030 {
3031         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3032
3033         iscsit_build_nopin_rsp(cmd, conn, hdr, true);
3034
3035         /*
3036          * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
3037          * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
3038          */
3039         pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size);
3040
3041         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3042                                                      cmd->buf_ptr,
3043                                                      cmd->buf_ptr_size);
3044 }
3045
3046 static int iscsit_send_r2t(
3047         struct iscsi_cmd *cmd,
3048         struct iscsi_conn *conn)
3049 {
3050         struct iscsi_r2t *r2t;
3051         struct iscsi_r2t_rsp *hdr;
3052         int ret;
3053
3054         r2t = iscsit_get_r2t_from_list(cmd);
3055         if (!r2t)
3056                 return -1;
3057
3058         hdr                     = (struct iscsi_r2t_rsp *) cmd->pdu;
3059         memset(hdr, 0, ISCSI_HDR_LEN);
3060         hdr->opcode             = ISCSI_OP_R2T;
3061         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3062         int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3063                         (struct scsi_lun *)&hdr->lun);
3064         hdr->itt                = cmd->init_task_tag;
3065         if (conn->conn_transport->iscsit_get_r2t_ttt)
3066                 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t);
3067         else
3068                 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
3069         hdr->ttt                = cpu_to_be32(r2t->targ_xfer_tag);
3070         hdr->statsn             = cpu_to_be32(conn->stat_sn);
3071         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3072         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3073         hdr->r2tsn              = cpu_to_be32(r2t->r2t_sn);
3074         hdr->data_offset        = cpu_to_be32(r2t->offset);
3075         hdr->data_length        = cpu_to_be32(r2t->xfer_len);
3076
3077         pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3078                 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3079                 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3080                 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3081                         r2t->offset, r2t->xfer_len, conn->cid);
3082
3083         spin_lock_bh(&cmd->r2t_lock);
3084         r2t->sent_r2t = 1;
3085         spin_unlock_bh(&cmd->r2t_lock);
3086
3087         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3088         if (ret < 0) {
3089                 return ret;
3090         }
3091
3092         spin_lock_bh(&cmd->dataout_timeout_lock);
3093         iscsit_start_dataout_timer(cmd, conn);
3094         spin_unlock_bh(&cmd->dataout_timeout_lock);
3095
3096         return 0;
3097 }
3098
3099 /*
3100  *      @recovery: If called from iscsi_task_reassign_complete_write() for
3101  *              connection recovery.
3102  */
3103 int iscsit_build_r2ts_for_cmd(
3104         struct iscsi_conn *conn,
3105         struct iscsi_cmd *cmd,
3106         bool recovery)
3107 {
3108         int first_r2t = 1;
3109         u32 offset = 0, xfer_len = 0;
3110
3111         spin_lock_bh(&cmd->r2t_lock);
3112         if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3113                 spin_unlock_bh(&cmd->r2t_lock);
3114                 return 0;
3115         }
3116
3117         if (conn->sess->sess_ops->DataSequenceInOrder &&
3118             !recovery)
3119                 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3120
3121         while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3122                 if (conn->sess->sess_ops->DataSequenceInOrder) {
3123                         offset = cmd->r2t_offset;
3124
3125                         if (first_r2t && recovery) {
3126                                 int new_data_end = offset +
3127                                         conn->sess->sess_ops->MaxBurstLength -
3128                                         cmd->next_burst_len;
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 =
3134                                                 conn->sess->sess_ops->MaxBurstLength -
3135                                                 cmd->next_burst_len;
3136                         } else {
3137                                 int new_data_end = offset +
3138                                         conn->sess->sess_ops->MaxBurstLength;
3139
3140                                 if (new_data_end > cmd->se_cmd.data_length)
3141                                         xfer_len = cmd->se_cmd.data_length - offset;
3142                                 else
3143                                         xfer_len = conn->sess->sess_ops->MaxBurstLength;
3144                         }
3145                         cmd->r2t_offset += xfer_len;
3146
3147                         if (cmd->r2t_offset == cmd->se_cmd.data_length)
3148                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3149                 } else {
3150                         struct iscsi_seq *seq;
3151
3152                         seq = iscsit_get_seq_holder_for_r2t(cmd);
3153                         if (!seq) {
3154                                 spin_unlock_bh(&cmd->r2t_lock);
3155                                 return -1;
3156                         }
3157
3158                         offset = seq->offset;
3159                         xfer_len = seq->xfer_len;
3160
3161                         if (cmd->seq_send_order == cmd->seq_count)
3162                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3163                 }
3164                 cmd->outstanding_r2ts++;
3165                 first_r2t = 0;
3166
3167                 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3168                         spin_unlock_bh(&cmd->r2t_lock);
3169                         return -1;
3170                 }
3171
3172                 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3173                         break;
3174         }
3175         spin_unlock_bh(&cmd->r2t_lock);
3176
3177         return 0;
3178 }
3179 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd);
3180
3181 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3182                         bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3183 {
3184         if (inc_stat_sn)
3185                 cmd->stat_sn = conn->stat_sn++;
3186
3187         atomic_long_inc(&conn->sess->rsp_pdus);
3188
3189         memset(hdr, 0, ISCSI_HDR_LEN);
3190         hdr->opcode             = ISCSI_OP_SCSI_CMD_RSP;
3191         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3192         if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3193                 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3194                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3195         } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3196                 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3197                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3198         }
3199         hdr->response           = cmd->iscsi_response;
3200         hdr->cmd_status         = cmd->se_cmd.scsi_status;
3201         hdr->itt                = cmd->init_task_tag;
3202         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3203
3204         iscsit_increment_maxcmdsn(cmd, conn->sess);
3205         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3206         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3207
3208         pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3209                 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3210                 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3211                 cmd->se_cmd.scsi_status, conn->cid);
3212 }
3213 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3214
3215 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3216 {
3217         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3218         bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3219         void *data_buf = NULL;
3220         u32 padding = 0, data_buf_len = 0;
3221
3222         iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3223
3224         /*
3225          * Attach SENSE DATA payload to iSCSI Response PDU
3226          */
3227         if (cmd->se_cmd.sense_buffer &&
3228            ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3229             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3230                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3231                 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3232
3233                 padding         = -(cmd->se_cmd.scsi_sense_length) & 3;
3234                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3235                 data_buf = cmd->sense_buffer;
3236                 data_buf_len = cmd->se_cmd.scsi_sense_length + padding;
3237
3238                 if (padding) {
3239                         memset(cmd->sense_buffer +
3240                                 cmd->se_cmd.scsi_sense_length, 0, padding);
3241                         pr_debug("Adding %u bytes of padding to"
3242                                 " SENSE.\n", padding);
3243                 }
3244
3245                 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3246                                 " Response PDU\n",
3247                                 cmd->se_cmd.scsi_sense_length);
3248         }
3249
3250         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf,
3251                                                      data_buf_len);
3252 }
3253
3254 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3255 {
3256         switch (se_tmr->response) {
3257         case TMR_FUNCTION_COMPLETE:
3258                 return ISCSI_TMF_RSP_COMPLETE;
3259         case TMR_TASK_DOES_NOT_EXIST:
3260                 return ISCSI_TMF_RSP_NO_TASK;
3261         case TMR_LUN_DOES_NOT_EXIST:
3262                 return ISCSI_TMF_RSP_NO_LUN;
3263         case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3264                 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3265         case TMR_FUNCTION_REJECTED:
3266         default:
3267                 return ISCSI_TMF_RSP_REJECTED;
3268         }
3269 }
3270
3271 void
3272 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3273                           struct iscsi_tm_rsp *hdr)
3274 {
3275         struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3276
3277         hdr->opcode             = ISCSI_OP_SCSI_TMFUNC_RSP;
3278         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
3279         hdr->response           = iscsit_convert_tcm_tmr_rsp(se_tmr);
3280         hdr->itt                = cmd->init_task_tag;
3281         cmd->stat_sn            = conn->stat_sn++;
3282         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3283
3284         iscsit_increment_maxcmdsn(cmd, conn->sess);
3285         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3286         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3287
3288         pr_debug("Built Task Management Response ITT: 0x%08x,"
3289                 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3290                 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3291 }
3292 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3293
3294 static int
3295 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3296 {
3297         struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3298
3299         iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3300
3301         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3302 }
3303
3304 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3305 {
3306         bool ret = false;
3307
3308         if (np->np_sockaddr.ss_family == AF_INET6) {
3309                 const struct sockaddr_in6 sin6 = {
3310                         .sin6_addr = IN6ADDR_ANY_INIT };
3311                 struct sockaddr_in6 *sock_in6 =
3312                          (struct sockaddr_in6 *)&np->np_sockaddr;
3313
3314                 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3315                                 sin6.sin6_addr.s6_addr, 16))
3316                         ret = true;
3317         } else {
3318                 struct sockaddr_in * sock_in =
3319                         (struct sockaddr_in *)&np->np_sockaddr;
3320
3321                 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
3322                         ret = true;
3323         }
3324
3325         return ret;
3326 }
3327
3328 #define SENDTARGETS_BUF_LIMIT 32768U
3329
3330 static int
3331 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
3332                                   enum iscsit_transport_type network_transport,
3333                                   int skip_bytes, bool *completed)
3334 {
3335         char *payload = NULL;
3336         struct iscsi_conn *conn = cmd->conn;
3337         struct iscsi_portal_group *tpg;
3338         struct iscsi_tiqn *tiqn;
3339         struct iscsi_tpg_np *tpg_np;
3340         int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3341         int target_name_printed;
3342         unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3343         unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3344         bool active;
3345
3346         buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3347                          SENDTARGETS_BUF_LIMIT);
3348
3349         payload = kzalloc(buffer_len, GFP_KERNEL);
3350         if (!payload)
3351                 return -ENOMEM;
3352
3353         /*
3354          * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3355          * explicit case..
3356          */
3357         if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3358                 text_ptr = strchr(text_in, '=');
3359                 if (!text_ptr) {
3360                         pr_err("Unable to locate '=' string in text_in:"
3361                                " %s\n", text_in);
3362                         kfree(payload);
3363                         return -EINVAL;
3364                 }
3365                 /*
3366                  * Skip over '=' character..
3367                  */
3368                 text_ptr += 1;
3369         }
3370
3371         spin_lock(&tiqn_lock);
3372         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3373                 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3374                      strcmp(tiqn->tiqn, text_ptr)) {
3375                         continue;
3376                 }
3377
3378                 target_name_printed = 0;
3379
3380                 spin_lock(&tiqn->tiqn_tpg_lock);
3381                 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3382
3383                         /* If demo_mode_discovery=0 and generate_node_acls=0
3384                          * (demo mode dislabed) do not return
3385                          * TargetName+TargetAddress unless a NodeACL exists.
3386                          */
3387
3388                         if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3389                             (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3390                             (!target_tpg_has_node_acl(&tpg->tpg_se_tpg,
3391                                 cmd->conn->sess->sess_ops->InitiatorName))) {
3392                                 continue;
3393                         }
3394
3395                         spin_lock(&tpg->tpg_state_lock);
3396                         active = (tpg->tpg_state == TPG_STATE_ACTIVE);
3397                         spin_unlock(&tpg->tpg_state_lock);
3398
3399                         if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets)
3400                                 continue;
3401
3402                         spin_lock(&tpg->tpg_np_lock);
3403                         list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3404                                                 tpg_np_list) {
3405                                 struct iscsi_np *np = tpg_np->tpg_np;
3406                                 bool inaddr_any = iscsit_check_inaddr_any(np);
3407                                 struct sockaddr_storage *sockaddr;
3408
3409                                 if (np->np_network_transport != network_transport)
3410                                         continue;
3411
3412                                 if (!target_name_printed) {
3413                                         len = sprintf(buf, "TargetName=%s",
3414                                                       tiqn->tiqn);
3415                                         len += 1;
3416
3417                                         if ((len + payload_len) > buffer_len) {
3418                                                 spin_unlock(&tpg->tpg_np_lock);
3419                                                 spin_unlock(&tiqn->tiqn_tpg_lock);
3420                                                 end_of_buf = 1;
3421                                                 goto eob;
3422                                         }
3423
3424                                         if (skip_bytes && len <= skip_bytes) {
3425                                                 skip_bytes -= len;
3426                                         } else {
3427                                                 memcpy(payload + payload_len, buf, len);
3428                                                 payload_len += len;
3429                                                 target_name_printed = 1;
3430                                                 if (len > skip_bytes)
3431                                                         skip_bytes = 0;
3432                                         }
3433                                 }
3434
3435                                 if (inaddr_any)
3436                                         sockaddr = &conn->local_sockaddr;
3437                                 else
3438                                         sockaddr = &np->np_sockaddr;
3439
3440                                 len = sprintf(buf, "TargetAddress="
3441                                               "%pISpc,%hu",
3442                                               sockaddr,
3443                                               tpg->tpgt);
3444                                 len += 1;
3445
3446                                 if ((len + payload_len) > buffer_len) {
3447                                         spin_unlock(&tpg->tpg_np_lock);
3448                                         spin_unlock(&tiqn->tiqn_tpg_lock);
3449                                         end_of_buf = 1;
3450                                         goto eob;
3451                                 }
3452
3453                                 if (skip_bytes && len <= skip_bytes) {
3454                                         skip_bytes -= len;
3455                                 } else {
3456                                         memcpy(payload + payload_len, buf, len);
3457                                         payload_len += len;
3458                                         if (len > skip_bytes)
3459                                                 skip_bytes = 0;
3460                                 }
3461                         }
3462                         spin_unlock(&tpg->tpg_np_lock);
3463                 }
3464                 spin_unlock(&tiqn->tiqn_tpg_lock);
3465 eob:
3466                 if (end_of_buf) {
3467                         *completed = false;
3468                         break;
3469                 }
3470
3471                 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3472                         break;
3473         }
3474         spin_unlock(&tiqn_lock);
3475
3476         cmd->buf_ptr = payload;
3477
3478         return payload_len;
3479 }
3480
3481 int
3482 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3483                       struct iscsi_text_rsp *hdr,
3484                       enum iscsit_transport_type network_transport)
3485 {
3486         int text_length, padding;
3487         bool completed = true;
3488
3489         text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3490                                                         cmd->read_data_done,
3491                                                         &completed);
3492         if (text_length < 0)
3493                 return text_length;
3494
3495         if (completed) {
3496                 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3497         } else {
3498                 hdr->flags |= ISCSI_FLAG_TEXT_CONTINUE;
3499                 cmd->read_data_done += text_length;
3500                 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3501                         cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3502         }
3503         hdr->opcode = ISCSI_OP_TEXT_RSP;
3504         padding = ((-text_length) & 3);
3505         hton24(hdr->dlength, text_length);
3506         hdr->itt = cmd->init_task_tag;
3507         hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3508         cmd->stat_sn = conn->stat_sn++;
3509         hdr->statsn = cpu_to_be32(cmd->stat_sn);
3510
3511         iscsit_increment_maxcmdsn(cmd, conn->sess);
3512         /*
3513          * Reset maxcmdsn_inc in multi-part text payload exchanges to
3514          * correctly increment MaxCmdSN for each response answering a
3515          * non immediate text request with a valid CmdSN.
3516          */
3517         cmd->maxcmdsn_inc = 0;
3518         hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3519         hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3520
3521         pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3522                 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3523                 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3524                 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3525                 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3526
3527         return text_length + padding;
3528 }
3529 EXPORT_SYMBOL(iscsit_build_text_rsp);
3530
3531 static int iscsit_send_text_rsp(
3532         struct iscsi_cmd *cmd,
3533         struct iscsi_conn *conn)
3534 {
3535         struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3536         int text_length;
3537
3538         text_length = iscsit_build_text_rsp(cmd, conn, hdr,
3539                                 conn->conn_transport->transport_type);
3540         if (text_length < 0)
3541                 return text_length;
3542
3543         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3544                                                      cmd->buf_ptr,
3545                                                      text_length);
3546 }
3547
3548 void
3549 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3550                     struct iscsi_reject *hdr)
3551 {
3552         hdr->opcode             = ISCSI_OP_REJECT;
3553         hdr->reason             = cmd->reject_reason;
3554         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3555         hton24(hdr->dlength, ISCSI_HDR_LEN);
3556         hdr->ffffffff           = cpu_to_be32(0xffffffff);
3557         cmd->stat_sn            = conn->stat_sn++;
3558         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3559         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3560         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3561
3562 }
3563 EXPORT_SYMBOL(iscsit_build_reject);
3564
3565 static int iscsit_send_reject(
3566         struct iscsi_cmd *cmd,
3567         struct iscsi_conn *conn)
3568 {
3569         struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3570
3571         iscsit_build_reject(cmd, conn, hdr);
3572
3573         pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3574                 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3575
3576         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3577                                                      cmd->buf_ptr,
3578                                                      ISCSI_HDR_LEN);
3579 }
3580
3581 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3582 {
3583         int ord, cpu;
3584         /*
3585          * bitmap_id is assigned from iscsit_global->ts_bitmap from
3586          * within iscsit_start_kthreads()
3587          *
3588          * Here we use bitmap_id to determine which CPU that this
3589          * iSCSI connection's RX/TX threads will be scheduled to
3590          * execute upon.
3591          */
3592         ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3593         for_each_online_cpu(cpu) {
3594                 if (ord-- == 0) {
3595                         cpumask_set_cpu(cpu, conn->conn_cpumask);
3596                         return;
3597                 }
3598         }
3599         /*
3600          * This should never be reached..
3601          */
3602         dump_stack();
3603         cpumask_setall(conn->conn_cpumask);
3604 }
3605
3606 int
3607 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3608 {
3609         int ret;
3610
3611         switch (state) {
3612         case ISTATE_SEND_R2T:
3613                 ret = iscsit_send_r2t(cmd, conn);
3614                 if (ret < 0)
3615                         goto err;
3616                 break;
3617         case ISTATE_REMOVE:
3618                 spin_lock_bh(&conn->cmd_lock);
3619                 list_del_init(&cmd->i_conn_node);
3620                 spin_unlock_bh(&conn->cmd_lock);
3621
3622                 iscsit_free_cmd(cmd, false);
3623                 break;
3624         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3625                 iscsit_mod_nopin_response_timer(conn);
3626                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3627                 if (ret < 0)
3628                         goto err;
3629                 break;
3630         case ISTATE_SEND_NOPIN_NO_RESPONSE:
3631                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3632                 if (ret < 0)
3633                         goto err;
3634                 break;
3635         default:
3636                 pr_err("Unknown Opcode: 0x%02x ITT:"
3637                        " 0x%08x, i_state: %d on CID: %hu\n",
3638                        cmd->iscsi_opcode, cmd->init_task_tag, state,
3639                        conn->cid);
3640                 goto err;
3641         }
3642
3643         return 0;
3644
3645 err:
3646         return -1;
3647 }
3648 EXPORT_SYMBOL(iscsit_immediate_queue);
3649
3650 static int
3651 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3652 {
3653         struct iscsit_transport *t = conn->conn_transport;
3654         struct iscsi_queue_req *qr;
3655         struct iscsi_cmd *cmd;
3656         u8 state;
3657         int ret;
3658
3659         while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3660                 atomic_set(&conn->check_immediate_queue, 0);
3661                 cmd = qr->cmd;
3662                 state = qr->state;
3663                 kmem_cache_free(lio_qr_cache, qr);
3664
3665                 ret = t->iscsit_immediate_queue(conn, cmd, state);
3666                 if (ret < 0)
3667                         return ret;
3668         }
3669
3670         return 0;
3671 }
3672
3673 int
3674 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3675 {
3676         int ret;
3677
3678 check_rsp_state:
3679         switch (state) {
3680         case ISTATE_SEND_DATAIN:
3681                 ret = iscsit_send_datain(cmd, conn);
3682                 if (ret < 0)
3683                         goto err;
3684                 else if (!ret)
3685                         /* more drs */
3686                         goto check_rsp_state;
3687                 else if (ret == 1) {
3688                         /* all done */
3689                         spin_lock_bh(&cmd->istate_lock);
3690                         cmd->i_state = ISTATE_SENT_STATUS;
3691                         spin_unlock_bh(&cmd->istate_lock);
3692
3693                         if (atomic_read(&conn->check_immediate_queue))
3694                                 return 1;
3695
3696                         return 0;
3697                 } else if (ret == 2) {
3698                         /* Still must send status,
3699                            SCF_TRANSPORT_TASK_SENSE was set */
3700                         spin_lock_bh(&cmd->istate_lock);
3701                         cmd->i_state = ISTATE_SEND_STATUS;
3702                         spin_unlock_bh(&cmd->istate_lock);
3703                         state = ISTATE_SEND_STATUS;
3704                         goto check_rsp_state;
3705                 }
3706
3707                 break;
3708         case ISTATE_SEND_STATUS:
3709         case ISTATE_SEND_STATUS_RECOVERY:
3710                 ret = iscsit_send_response(cmd, conn);
3711                 break;
3712         case ISTATE_SEND_LOGOUTRSP:
3713                 ret = iscsit_send_logout(cmd, conn);
3714                 break;
3715         case ISTATE_SEND_ASYNCMSG:
3716                 ret = iscsit_send_conn_drop_async_message(
3717                         cmd, conn);
3718                 break;
3719         case ISTATE_SEND_NOPIN:
3720                 ret = iscsit_send_nopin(cmd, conn);
3721                 break;
3722         case ISTATE_SEND_REJECT:
3723                 ret = iscsit_send_reject(cmd, conn);
3724                 break;
3725         case ISTATE_SEND_TASKMGTRSP:
3726                 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3727                 if (ret != 0)
3728                         break;
3729                 ret = iscsit_tmr_post_handler(cmd, conn);
3730                 if (ret != 0)
3731                         iscsit_fall_back_to_erl0(conn->sess);
3732                 break;
3733         case ISTATE_SEND_TEXTRSP:
3734                 ret = iscsit_send_text_rsp(cmd, conn);
3735                 break;
3736         default:
3737                 pr_err("Unknown Opcode: 0x%02x ITT:"
3738                        " 0x%08x, i_state: %d on CID: %hu\n",
3739                        cmd->iscsi_opcode, cmd->init_task_tag,
3740                        state, conn->cid);
3741                 goto err;
3742         }
3743         if (ret < 0)
3744                 goto err;
3745
3746         switch (state) {
3747         case ISTATE_SEND_LOGOUTRSP:
3748                 if (!iscsit_logout_post_handler(cmd, conn))
3749                         return -ECONNRESET;
3750                 /* fall through */
3751         case ISTATE_SEND_STATUS:
3752         case ISTATE_SEND_ASYNCMSG:
3753         case ISTATE_SEND_NOPIN:
3754         case ISTATE_SEND_STATUS_RECOVERY:
3755         case ISTATE_SEND_TEXTRSP:
3756         case ISTATE_SEND_TASKMGTRSP:
3757         case ISTATE_SEND_REJECT:
3758                 spin_lock_bh(&cmd->istate_lock);
3759                 cmd->i_state = ISTATE_SENT_STATUS;
3760                 spin_unlock_bh(&cmd->istate_lock);
3761                 break;
3762         default:
3763                 pr_err("Unknown Opcode: 0x%02x ITT:"
3764                        " 0x%08x, i_state: %d on CID: %hu\n",
3765                        cmd->iscsi_opcode, cmd->init_task_tag,
3766                        cmd->i_state, conn->cid);
3767                 goto err;
3768         }
3769
3770         if (atomic_read(&conn->check_immediate_queue))
3771                 return 1;
3772
3773         return 0;
3774
3775 err:
3776         return -1;
3777 }
3778 EXPORT_SYMBOL(iscsit_response_queue);
3779
3780 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3781 {
3782         struct iscsit_transport *t = conn->conn_transport;
3783         struct iscsi_queue_req *qr;
3784         struct iscsi_cmd *cmd;
3785         u8 state;
3786         int ret;
3787
3788         while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3789                 cmd = qr->cmd;
3790                 state = qr->state;
3791                 kmem_cache_free(lio_qr_cache, qr);
3792
3793                 ret = t->iscsit_response_queue(conn, cmd, state);
3794                 if (ret == 1 || ret < 0)
3795                         return ret;
3796         }
3797
3798         return 0;
3799 }
3800
3801 int iscsi_target_tx_thread(void *arg)
3802 {
3803         int ret = 0;
3804         struct iscsi_conn *conn = arg;
3805         bool conn_freed = false;
3806
3807         /*
3808          * Allow ourselves to be interrupted by SIGINT so that a
3809          * connection recovery / failure event can be triggered externally.
3810          */
3811         allow_signal(SIGINT);
3812
3813         while (!kthread_should_stop()) {
3814                 /*
3815                  * Ensure that both TX and RX per connection kthreads
3816                  * are scheduled to run on the same CPU.
3817                  */
3818                 iscsit_thread_check_cpumask(conn, current, 1);
3819
3820                 wait_event_interruptible(conn->queues_wq,
3821                                          !iscsit_conn_all_queues_empty(conn));
3822
3823                 if (signal_pending(current))
3824                         goto transport_err;
3825
3826 get_immediate:
3827                 ret = iscsit_handle_immediate_queue(conn);
3828                 if (ret < 0)
3829                         goto transport_err;
3830
3831                 ret = iscsit_handle_response_queue(conn);
3832                 if (ret == 1) {
3833                         goto get_immediate;
3834                 } else if (ret == -ECONNRESET) {
3835                         conn_freed = true;
3836                         goto out;
3837                 } else if (ret < 0) {
3838                         goto transport_err;
3839                 }
3840         }
3841
3842 transport_err:
3843         /*
3844          * Avoid the normal connection failure code-path if this connection
3845          * is still within LOGIN mode, and iscsi_np process context is
3846          * responsible for cleaning up the early connection failure.
3847          */
3848         if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
3849                 iscsit_take_action_for_connection_exit(conn, &conn_freed);
3850 out:
3851         if (!conn_freed) {
3852                 while (!kthread_should_stop()) {
3853                         msleep(100);
3854                 }
3855         }
3856         return 0;
3857 }
3858
3859 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3860 {
3861         struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3862         struct iscsi_cmd *cmd;
3863         int ret = 0;
3864
3865         switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3866         case ISCSI_OP_SCSI_CMD:
3867                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3868                 if (!cmd)
3869                         goto reject;
3870
3871                 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3872                 break;
3873         case ISCSI_OP_SCSI_DATA_OUT:
3874                 ret = iscsit_handle_data_out(conn, buf);
3875                 break;
3876         case ISCSI_OP_NOOP_OUT:
3877                 cmd = NULL;
3878                 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3879                         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3880                         if (!cmd)
3881                                 goto reject;
3882                 }
3883                 ret = iscsit_handle_nop_out(conn, cmd, buf);
3884                 break;
3885         case ISCSI_OP_SCSI_TMFUNC:
3886                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3887                 if (!cmd)
3888                         goto reject;
3889
3890                 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3891                 break;
3892         case ISCSI_OP_TEXT:
3893                 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
3894                         cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
3895                         if (!cmd)
3896                                 goto reject;
3897                 } else {
3898                         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3899                         if (!cmd)
3900                                 goto reject;
3901                 }
3902
3903                 ret = iscsit_handle_text_cmd(conn, cmd, buf);
3904                 break;
3905         case ISCSI_OP_LOGOUT:
3906                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3907                 if (!cmd)
3908                         goto reject;
3909
3910                 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3911                 if (ret > 0)
3912                         wait_for_completion_timeout(&conn->conn_logout_comp,
3913                                         SECONDS_FOR_LOGOUT_COMP * HZ);
3914                 break;
3915         case ISCSI_OP_SNACK:
3916                 ret = iscsit_handle_snack(conn, buf);
3917                 break;
3918         default:
3919                 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
3920                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3921                         pr_err("Cannot recover from unknown"
3922                         " opcode while ERL=0, closing iSCSI connection.\n");
3923                         return -1;
3924                 }
3925                 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
3926                        " closing iSCSI connection.\n");
3927                 ret = -1;
3928                 break;
3929         }
3930
3931         return ret;
3932 reject:
3933         return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3934 }
3935
3936 static bool iscsi_target_check_conn_state(struct iscsi_conn *conn)
3937 {
3938         bool ret;
3939
3940         spin_lock_bh(&conn->state_lock);
3941         ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN);
3942         spin_unlock_bh(&conn->state_lock);
3943
3944         return ret;
3945 }
3946
3947 static void iscsit_get_rx_pdu(struct iscsi_conn *conn)
3948 {
3949         int ret;
3950         u8 buffer[ISCSI_HDR_LEN], opcode;
3951         u32 checksum = 0, digest = 0;
3952         struct kvec iov;
3953
3954         while (!kthread_should_stop()) {
3955                 /*
3956                  * Ensure that both TX and RX per connection kthreads
3957                  * are scheduled to run on the same CPU.
3958                  */
3959                 iscsit_thread_check_cpumask(conn, current, 0);
3960
3961                 memset(buffer, 0, ISCSI_HDR_LEN);
3962                 memset(&iov, 0, sizeof(struct kvec));
3963
3964                 iov.iov_base    = buffer;
3965                 iov.iov_len     = ISCSI_HDR_LEN;
3966
3967                 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3968                 if (ret != ISCSI_HDR_LEN) {
3969                         iscsit_rx_thread_wait_for_tcp(conn);
3970                         return;
3971                 }
3972
3973                 if (conn->conn_ops->HeaderDigest) {
3974                         iov.iov_base    = &digest;
3975                         iov.iov_len     = ISCSI_CRC_LEN;
3976
3977                         ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3978                         if (ret != ISCSI_CRC_LEN) {
3979                                 iscsit_rx_thread_wait_for_tcp(conn);
3980                                 return;
3981                         }
3982
3983                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
3984                                         buffer, ISCSI_HDR_LEN,
3985                                         0, NULL, (u8 *)&checksum);
3986
3987                         if (digest != checksum) {
3988                                 pr_err("HeaderDigest CRC32C failed,"
3989                                         " received 0x%08x, computed 0x%08x\n",
3990                                         digest, checksum);
3991                                 /*
3992                                  * Set the PDU to 0xff so it will intentionally
3993                                  * hit default in the switch below.
3994                                  */
3995                                 memset(buffer, 0xff, ISCSI_HDR_LEN);
3996                                 atomic_long_inc(&conn->sess->conn_digest_errors);
3997                         } else {
3998                                 pr_debug("Got HeaderDigest CRC32C"
3999                                                 " 0x%08x\n", checksum);
4000                         }
4001                 }
4002
4003                 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4004                         return;
4005
4006                 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4007
4008                 if (conn->sess->sess_ops->SessionType &&
4009                    ((!(opcode & ISCSI_OP_TEXT)) ||
4010                     (!(opcode & ISCSI_OP_LOGOUT)))) {
4011                         pr_err("Received illegal iSCSI Opcode: 0x%02x"
4012                         " while in Discovery Session, rejecting.\n", opcode);
4013                         iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4014                                           buffer);
4015                         return;
4016                 }
4017
4018                 ret = iscsi_target_rx_opcode(conn, buffer);
4019                 if (ret < 0)
4020                         return;
4021         }
4022 }
4023
4024 int iscsi_target_rx_thread(void *arg)
4025 {
4026         int rc;
4027         struct iscsi_conn *conn = arg;
4028         bool conn_freed = false;
4029
4030         /*
4031          * Allow ourselves to be interrupted by SIGINT so that a
4032          * connection recovery / failure event can be triggered externally.
4033          */
4034         allow_signal(SIGINT);
4035         /*
4036          * Wait for iscsi_post_login_handler() to complete before allowing
4037          * incoming iscsi/tcp socket I/O, and/or failing the connection.
4038          */
4039         rc = wait_for_completion_interruptible(&conn->rx_login_comp);
4040         if (rc < 0 || iscsi_target_check_conn_state(conn))
4041                 goto out;
4042
4043         if (!conn->conn_transport->iscsit_get_rx_pdu)
4044                 return 0;
4045
4046         conn->conn_transport->iscsit_get_rx_pdu(conn);
4047
4048         if (!signal_pending(current))
4049                 atomic_set(&conn->transport_failed, 1);
4050         iscsit_take_action_for_connection_exit(conn, &conn_freed);
4051
4052 out:
4053         if (!conn_freed) {
4054                 while (!kthread_should_stop()) {
4055                         msleep(100);
4056                 }
4057         }
4058
4059         return 0;
4060 }
4061
4062 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4063 {
4064         LIST_HEAD(tmp_list);
4065         struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4066         struct iscsi_session *sess = conn->sess;
4067         /*
4068          * We expect this function to only ever be called from either RX or TX
4069          * thread context via iscsit_close_connection() once the other context
4070          * has been reset -> returned sleeping pre-handler state.
4071          */
4072         spin_lock_bh(&conn->cmd_lock);
4073         list_splice_init(&conn->conn_cmd_list, &tmp_list);
4074
4075         list_for_each_entry(cmd, &tmp_list, i_conn_node) {
4076                 struct se_cmd *se_cmd = &cmd->se_cmd;
4077
4078                 if (se_cmd->se_tfo != NULL) {
4079                         spin_lock(&se_cmd->t_state_lock);
4080                         se_cmd->transport_state |= CMD_T_FABRIC_STOP;
4081                         spin_unlock(&se_cmd->t_state_lock);
4082                 }
4083         }
4084         spin_unlock_bh(&conn->cmd_lock);
4085
4086         list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4087                 list_del_init(&cmd->i_conn_node);
4088
4089                 iscsit_increment_maxcmdsn(cmd, sess);
4090                 iscsit_free_cmd(cmd, true);
4091
4092         }
4093 }
4094
4095 static void iscsit_stop_timers_for_cmds(
4096         struct iscsi_conn *conn)
4097 {
4098         struct iscsi_cmd *cmd;
4099
4100         spin_lock_bh(&conn->cmd_lock);
4101         list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4102                 if (cmd->data_direction == DMA_TO_DEVICE)
4103                         iscsit_stop_dataout_timer(cmd);
4104         }
4105         spin_unlock_bh(&conn->cmd_lock);
4106 }
4107
4108 int iscsit_close_connection(
4109         struct iscsi_conn *conn)
4110 {
4111         int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4112         struct iscsi_session    *sess = conn->sess;
4113
4114         pr_debug("Closing iSCSI connection CID %hu on SID:"
4115                 " %u\n", conn->cid, sess->sid);
4116         /*
4117          * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD
4118          * case just in case the RX Thread in iscsi_target_rx_opcode() is
4119          * sleeping and the logout response never got sent because the
4120          * connection failed.
4121          *
4122          * However for iser-target, isert_wait4logout() is using conn_logout_comp
4123          * to signal logout response TX interrupt completion.  Go ahead and skip
4124          * this for iser since isert_rx_opcode() does not wait on logout failure,
4125          * and to avoid iscsi_conn pointer dereference in iser-target code.
4126          */
4127         if (!conn->conn_transport->rdma_shutdown)
4128                 complete(&conn->conn_logout_comp);
4129
4130         if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4131                 if (conn->tx_thread &&
4132                     cmpxchg(&conn->tx_thread_active, true, false)) {
4133                         send_sig(SIGINT, conn->tx_thread, 1);
4134                         kthread_stop(conn->tx_thread);
4135                 }
4136         } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4137                 if (conn->rx_thread &&
4138                     cmpxchg(&conn->rx_thread_active, true, false)) {
4139                         send_sig(SIGINT, conn->rx_thread, 1);
4140                         kthread_stop(conn->rx_thread);
4141                 }
4142         }
4143
4144         spin_lock(&iscsit_global->ts_bitmap_lock);
4145         bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4146                               get_order(1));
4147         spin_unlock(&iscsit_global->ts_bitmap_lock);
4148
4149         iscsit_stop_timers_for_cmds(conn);
4150         iscsit_stop_nopin_response_timer(conn);
4151         iscsit_stop_nopin_timer(conn);
4152
4153         if (conn->conn_transport->iscsit_wait_conn)
4154                 conn->conn_transport->iscsit_wait_conn(conn);
4155
4156         /*
4157          * During Connection recovery drop unacknowledged out of order
4158          * commands for this connection, and prepare the other commands
4159          * for reallegiance.
4160          *
4161          * During normal operation clear the out of order commands (but
4162          * do not free the struct iscsi_ooo_cmdsn's) and release all
4163          * struct iscsi_cmds.
4164          */
4165         if (atomic_read(&conn->connection_recovery)) {
4166                 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4167                 iscsit_prepare_cmds_for_reallegiance(conn);
4168         } else {
4169                 iscsit_clear_ooo_cmdsns_for_conn(conn);
4170                 iscsit_release_commands_from_conn(conn);
4171         }
4172         iscsit_free_queue_reqs_for_conn(conn);
4173
4174         /*
4175          * Handle decrementing session or connection usage count if
4176          * a logout response was not able to be sent because the
4177          * connection failed.  Fall back to Session Recovery here.
4178          */
4179         if (atomic_read(&conn->conn_logout_remove)) {
4180                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4181                         iscsit_dec_conn_usage_count(conn);
4182                         iscsit_dec_session_usage_count(sess);
4183                 }
4184                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4185                         iscsit_dec_conn_usage_count(conn);
4186
4187                 atomic_set(&conn->conn_logout_remove, 0);
4188                 atomic_set(&sess->session_reinstatement, 0);
4189                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4190         }
4191
4192         spin_lock_bh(&sess->conn_lock);
4193         list_del(&conn->conn_list);
4194
4195         /*
4196          * Attempt to let the Initiator know this connection failed by
4197          * sending an Connection Dropped Async Message on another
4198          * active connection.
4199          */
4200         if (atomic_read(&conn->connection_recovery))
4201                 iscsit_build_conn_drop_async_message(conn);
4202
4203         spin_unlock_bh(&sess->conn_lock);
4204
4205         /*
4206          * If connection reinstatement is being performed on this connection,
4207          * up the connection reinstatement semaphore that is being blocked on
4208          * in iscsit_cause_connection_reinstatement().
4209          */
4210         spin_lock_bh(&conn->state_lock);
4211         if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4212                 spin_unlock_bh(&conn->state_lock);
4213                 complete(&conn->conn_wait_comp);
4214                 wait_for_completion(&conn->conn_post_wait_comp);
4215                 spin_lock_bh(&conn->state_lock);
4216         }
4217
4218         /*
4219          * If connection reinstatement is being performed on this connection
4220          * by receiving a REMOVECONNFORRECOVERY logout request, up the
4221          * connection wait rcfr semaphore that is being blocked on
4222          * an iscsit_connection_reinstatement_rcfr().
4223          */
4224         if (atomic_read(&conn->connection_wait_rcfr)) {
4225                 spin_unlock_bh(&conn->state_lock);
4226                 complete(&conn->conn_wait_rcfr_comp);
4227                 wait_for_completion(&conn->conn_post_wait_comp);
4228                 spin_lock_bh(&conn->state_lock);
4229         }
4230         atomic_set(&conn->connection_reinstatement, 1);
4231         spin_unlock_bh(&conn->state_lock);
4232
4233         /*
4234          * If any other processes are accessing this connection pointer we
4235          * must wait until they have completed.
4236          */
4237         iscsit_check_conn_usage_count(conn);
4238
4239         ahash_request_free(conn->conn_tx_hash);
4240         if (conn->conn_rx_hash) {
4241                 struct crypto_ahash *tfm;
4242
4243                 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
4244                 ahash_request_free(conn->conn_rx_hash);
4245                 crypto_free_ahash(tfm);
4246         }
4247
4248         free_cpumask_var(conn->conn_cpumask);
4249
4250         kfree(conn->conn_ops);
4251         conn->conn_ops = NULL;
4252
4253         if (conn->sock)
4254                 sock_release(conn->sock);
4255
4256         if (conn->conn_transport->iscsit_free_conn)
4257                 conn->conn_transport->iscsit_free_conn(conn);
4258
4259         iscsit_put_transport(conn->conn_transport);
4260
4261         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4262         conn->conn_state = TARG_CONN_STATE_FREE;
4263         kfree(conn);
4264
4265         spin_lock_bh(&sess->conn_lock);
4266         atomic_dec(&sess->nconn);
4267         pr_debug("Decremented iSCSI connection count to %hu from node:"
4268                 " %s\n", atomic_read(&sess->nconn),
4269                 sess->sess_ops->InitiatorName);
4270         /*
4271          * Make sure that if one connection fails in an non ERL=2 iSCSI
4272          * Session that they all fail.
4273          */
4274         if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4275              !atomic_read(&sess->session_logout))
4276                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4277
4278         /*
4279          * If this was not the last connection in the session, and we are
4280          * performing session reinstatement or falling back to ERL=0, call
4281          * iscsit_stop_session() without sleeping to shutdown the other
4282          * active connections.
4283          */
4284         if (atomic_read(&sess->nconn)) {
4285                 if (!atomic_read(&sess->session_reinstatement) &&
4286                     !atomic_read(&sess->session_fall_back_to_erl0)) {
4287                         spin_unlock_bh(&sess->conn_lock);
4288                         return 0;
4289                 }
4290                 if (!atomic_read(&sess->session_stop_active)) {
4291                         atomic_set(&sess->session_stop_active, 1);
4292                         spin_unlock_bh(&sess->conn_lock);
4293                         iscsit_stop_session(sess, 0, 0);
4294                         return 0;
4295                 }
4296                 spin_unlock_bh(&sess->conn_lock);
4297                 return 0;
4298         }
4299
4300         /*
4301          * If this was the last connection in the session and one of the
4302          * following is occurring:
4303          *
4304          * Session Reinstatement is not being performed, and are falling back
4305          * to ERL=0 call iscsit_close_session().
4306          *
4307          * Session Logout was requested.  iscsit_close_session() will be called
4308          * elsewhere.
4309          *
4310          * Session Continuation is not being performed, start the Time2Retain
4311          * handler and check if sleep_on_sess_wait_sem is active.
4312          */
4313         if (!atomic_read(&sess->session_reinstatement) &&
4314              atomic_read(&sess->session_fall_back_to_erl0)) {
4315                 spin_unlock_bh(&sess->conn_lock);
4316                 iscsit_close_session(sess);
4317
4318                 return 0;
4319         } else if (atomic_read(&sess->session_logout)) {
4320                 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4321                 sess->session_state = TARG_SESS_STATE_FREE;
4322                 spin_unlock_bh(&sess->conn_lock);
4323
4324                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4325                         complete(&sess->session_wait_comp);
4326
4327                 return 0;
4328         } else {
4329                 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4330                 sess->session_state = TARG_SESS_STATE_FAILED;
4331
4332                 if (!atomic_read(&sess->session_continuation)) {
4333                         spin_unlock_bh(&sess->conn_lock);
4334                         iscsit_start_time2retain_handler(sess);
4335                 } else
4336                         spin_unlock_bh(&sess->conn_lock);
4337
4338                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4339                         complete(&sess->session_wait_comp);
4340
4341                 return 0;
4342         }
4343 }
4344
4345 /*
4346  * If the iSCSI Session for the iSCSI Initiator Node exists,
4347  * forcefully shutdown the iSCSI NEXUS.
4348  */
4349 int iscsit_close_session(struct iscsi_session *sess)
4350 {
4351         struct iscsi_portal_group *tpg = sess->tpg;
4352         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4353
4354         if (atomic_read(&sess->nconn)) {
4355                 pr_err("%d connection(s) still exist for iSCSI session"
4356                         " to %s\n", atomic_read(&sess->nconn),
4357                         sess->sess_ops->InitiatorName);
4358                 BUG();
4359         }
4360
4361         spin_lock_bh(&se_tpg->session_lock);
4362         atomic_set(&sess->session_logout, 1);
4363         atomic_set(&sess->session_reinstatement, 1);
4364         iscsit_stop_time2retain_timer(sess);
4365         spin_unlock_bh(&se_tpg->session_lock);
4366
4367         /*
4368          * transport_deregister_session_configfs() will clear the
4369          * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4370          * can be setting it again with __transport_register_session() in
4371          * iscsi_post_login_handler() again after the iscsit_stop_session()
4372          * completes in iscsi_np context.
4373          */
4374         transport_deregister_session_configfs(sess->se_sess);
4375
4376         /*
4377          * If any other processes are accessing this session pointer we must
4378          * wait until they have completed.  If we are in an interrupt (the
4379          * time2retain handler) and contain and active session usage count we
4380          * restart the timer and exit.
4381          */
4382         if (!in_interrupt()) {
4383                 if (iscsit_check_session_usage_count(sess) == 1)
4384                         iscsit_stop_session(sess, 1, 1);
4385         } else {
4386                 if (iscsit_check_session_usage_count(sess) == 2) {
4387                         atomic_set(&sess->session_logout, 0);
4388                         iscsit_start_time2retain_handler(sess);
4389                         return 0;
4390                 }
4391         }
4392
4393         transport_deregister_session(sess->se_sess);
4394
4395         if (sess->sess_ops->ErrorRecoveryLevel == 2)
4396                 iscsit_free_connection_recovery_entires(sess);
4397
4398         iscsit_free_all_ooo_cmdsns(sess);
4399
4400         spin_lock_bh(&se_tpg->session_lock);
4401         pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4402         sess->session_state = TARG_SESS_STATE_FREE;
4403         pr_debug("Released iSCSI session from node: %s\n",
4404                         sess->sess_ops->InitiatorName);
4405         tpg->nsessions--;
4406         if (tpg->tpg_tiqn)
4407                 tpg->tpg_tiqn->tiqn_nsessions--;
4408
4409         pr_debug("Decremented number of active iSCSI Sessions on"
4410                 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4411
4412         spin_lock(&sess_idr_lock);
4413         idr_remove(&sess_idr, sess->session_index);
4414         spin_unlock(&sess_idr_lock);
4415
4416         kfree(sess->sess_ops);
4417         sess->sess_ops = NULL;
4418         spin_unlock_bh(&se_tpg->session_lock);
4419
4420         kfree(sess);
4421         return 0;
4422 }
4423
4424 static void iscsit_logout_post_handler_closesession(
4425         struct iscsi_conn *conn)
4426 {
4427         struct iscsi_session *sess = conn->sess;
4428         int sleep = 1;
4429         /*
4430          * Traditional iscsi/tcp will invoke this logic from TX thread
4431          * context during session logout, so clear tx_thread_active and
4432          * sleep if iscsit_close_connection() has not already occured.
4433          *
4434          * Since iser-target invokes this logic from it's own workqueue,
4435          * always sleep waiting for RX/TX thread shutdown to complete
4436          * within iscsit_close_connection().
4437          */
4438         if (!conn->conn_transport->rdma_shutdown) {
4439                 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4440                 if (!sleep)
4441                         return;
4442         }
4443
4444         atomic_set(&conn->conn_logout_remove, 0);
4445         complete(&conn->conn_logout_comp);
4446
4447         iscsit_dec_conn_usage_count(conn);
4448         iscsit_stop_session(sess, sleep, sleep);
4449         iscsit_dec_session_usage_count(sess);
4450         iscsit_close_session(sess);
4451 }
4452
4453 static void iscsit_logout_post_handler_samecid(
4454         struct iscsi_conn *conn)
4455 {
4456         int sleep = 1;
4457
4458         if (!conn->conn_transport->rdma_shutdown) {
4459                 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4460                 if (!sleep)
4461                         return;
4462         }
4463
4464         atomic_set(&conn->conn_logout_remove, 0);
4465         complete(&conn->conn_logout_comp);
4466
4467         iscsit_cause_connection_reinstatement(conn, sleep);
4468         iscsit_dec_conn_usage_count(conn);
4469 }
4470
4471 static void iscsit_logout_post_handler_diffcid(
4472         struct iscsi_conn *conn,
4473         u16 cid)
4474 {
4475         struct iscsi_conn *l_conn;
4476         struct iscsi_session *sess = conn->sess;
4477         bool conn_found = false;
4478
4479         if (!sess)
4480                 return;
4481
4482         spin_lock_bh(&sess->conn_lock);
4483         list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4484                 if (l_conn->cid == cid) {
4485                         iscsit_inc_conn_usage_count(l_conn);
4486                         conn_found = true;
4487                         break;
4488                 }
4489         }
4490         spin_unlock_bh(&sess->conn_lock);
4491
4492         if (!conn_found)
4493                 return;
4494
4495         if (l_conn->sock)
4496                 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4497
4498         spin_lock_bh(&l_conn->state_lock);
4499         pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4500         l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4501         spin_unlock_bh(&l_conn->state_lock);
4502
4503         iscsit_cause_connection_reinstatement(l_conn, 1);
4504         iscsit_dec_conn_usage_count(l_conn);
4505 }
4506
4507 /*
4508  *      Return of 0 causes the TX thread to restart.
4509  */
4510 int iscsit_logout_post_handler(
4511         struct iscsi_cmd *cmd,
4512         struct iscsi_conn *conn)
4513 {
4514         int ret = 0;
4515
4516         switch (cmd->logout_reason) {
4517         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4518                 switch (cmd->logout_response) {
4519                 case ISCSI_LOGOUT_SUCCESS:
4520                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4521                 default:
4522                         iscsit_logout_post_handler_closesession(conn);
4523                         break;
4524                 }
4525                 ret = 0;
4526                 break;
4527         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4528                 if (conn->cid == cmd->logout_cid) {
4529                         switch (cmd->logout_response) {
4530                         case ISCSI_LOGOUT_SUCCESS:
4531                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4532                         default:
4533                                 iscsit_logout_post_handler_samecid(conn);
4534                                 break;
4535                         }
4536                         ret = 0;
4537                 } else {
4538                         switch (cmd->logout_response) {
4539                         case ISCSI_LOGOUT_SUCCESS:
4540                                 iscsit_logout_post_handler_diffcid(conn,
4541                                         cmd->logout_cid);
4542                                 break;
4543                         case ISCSI_LOGOUT_CID_NOT_FOUND:
4544                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4545                         default:
4546                                 break;
4547                         }
4548                         ret = 1;
4549                 }
4550                 break;
4551         case ISCSI_LOGOUT_REASON_RECOVERY:
4552                 switch (cmd->logout_response) {
4553                 case ISCSI_LOGOUT_SUCCESS:
4554                 case ISCSI_LOGOUT_CID_NOT_FOUND:
4555                 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4556                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4557                 default:
4558                         break;
4559                 }
4560                 ret = 1;
4561                 break;
4562         default:
4563                 break;
4564
4565         }
4566         return ret;
4567 }
4568 EXPORT_SYMBOL(iscsit_logout_post_handler);
4569
4570 void iscsit_fail_session(struct iscsi_session *sess)
4571 {
4572         struct iscsi_conn *conn;
4573
4574         spin_lock_bh(&sess->conn_lock);
4575         list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4576                 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4577                 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4578         }
4579         spin_unlock_bh(&sess->conn_lock);
4580
4581         pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4582         sess->session_state = TARG_SESS_STATE_FAILED;
4583 }
4584
4585 int iscsit_free_session(struct iscsi_session *sess)
4586 {
4587         u16 conn_count = atomic_read(&sess->nconn);
4588         struct iscsi_conn *conn, *conn_tmp = NULL;
4589         int is_last;
4590
4591         spin_lock_bh(&sess->conn_lock);
4592         atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4593
4594         list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4595                         conn_list) {
4596                 if (conn_count == 0)
4597                         break;
4598
4599                 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4600                         is_last = 1;
4601                 } else {
4602                         iscsit_inc_conn_usage_count(conn_tmp);
4603                         is_last = 0;
4604                 }
4605                 iscsit_inc_conn_usage_count(conn);
4606
4607                 spin_unlock_bh(&sess->conn_lock);
4608                 iscsit_cause_connection_reinstatement(conn, 1);
4609                 spin_lock_bh(&sess->conn_lock);
4610
4611                 iscsit_dec_conn_usage_count(conn);
4612                 if (is_last == 0)
4613                         iscsit_dec_conn_usage_count(conn_tmp);
4614
4615                 conn_count--;
4616         }
4617
4618         if (atomic_read(&sess->nconn)) {
4619                 spin_unlock_bh(&sess->conn_lock);
4620                 wait_for_completion(&sess->session_wait_comp);
4621         } else
4622                 spin_unlock_bh(&sess->conn_lock);
4623
4624         iscsit_close_session(sess);
4625         return 0;
4626 }
4627
4628 void iscsit_stop_session(
4629         struct iscsi_session *sess,
4630         int session_sleep,
4631         int connection_sleep)
4632 {
4633         u16 conn_count = atomic_read(&sess->nconn);
4634         struct iscsi_conn *conn, *conn_tmp = NULL;
4635         int is_last;
4636
4637         spin_lock_bh(&sess->conn_lock);
4638         if (session_sleep)
4639                 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4640
4641         if (connection_sleep) {
4642                 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4643                                 conn_list) {
4644                         if (conn_count == 0)
4645                                 break;
4646
4647                         if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4648                                 is_last = 1;
4649                         } else {
4650                                 iscsit_inc_conn_usage_count(conn_tmp);
4651                                 is_last = 0;
4652                         }
4653                         iscsit_inc_conn_usage_count(conn);
4654
4655                         spin_unlock_bh(&sess->conn_lock);
4656                         iscsit_cause_connection_reinstatement(conn, 1);
4657                         spin_lock_bh(&sess->conn_lock);
4658
4659                         iscsit_dec_conn_usage_count(conn);
4660                         if (is_last == 0)
4661                                 iscsit_dec_conn_usage_count(conn_tmp);
4662                         conn_count--;
4663                 }
4664         } else {
4665                 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4666                         iscsit_cause_connection_reinstatement(conn, 0);
4667         }
4668
4669         if (session_sleep && atomic_read(&sess->nconn)) {
4670                 spin_unlock_bh(&sess->conn_lock);
4671                 wait_for_completion(&sess->session_wait_comp);
4672         } else
4673                 spin_unlock_bh(&sess->conn_lock);
4674 }
4675
4676 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4677 {
4678         struct iscsi_session *sess;
4679         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4680         struct se_session *se_sess, *se_sess_tmp;
4681         LIST_HEAD(free_list);
4682         int session_count = 0;
4683
4684         spin_lock_bh(&se_tpg->session_lock);
4685         if (tpg->nsessions && !force) {
4686                 spin_unlock_bh(&se_tpg->session_lock);
4687                 return -1;
4688         }
4689
4690         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4691                         sess_list) {
4692                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4693
4694                 spin_lock(&sess->conn_lock);
4695                 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4696                     atomic_read(&sess->session_logout) ||
4697                     (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4698                         spin_unlock(&sess->conn_lock);
4699                         continue;
4700                 }
4701                 atomic_set(&sess->session_reinstatement, 1);
4702                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4703                 spin_unlock(&sess->conn_lock);
4704
4705                 list_move_tail(&se_sess->sess_list, &free_list);
4706         }
4707         spin_unlock_bh(&se_tpg->session_lock);
4708
4709         list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
4710                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4711
4712                 iscsit_free_session(sess);
4713                 session_count++;
4714         }
4715
4716         pr_debug("Released %d iSCSI Session(s) from Target Portal"
4717                         " Group: %hu\n", session_count, tpg->tpgt);
4718         return 0;
4719 }
4720
4721 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4722 MODULE_VERSION("4.1.x");
4723 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4724 MODULE_LICENSE("GPL");
4725
4726 module_init(iscsi_target_init_module);
4727 module_exit(iscsi_target_cleanup_module);