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         spin_lock_bh(&conn->cmd_lock);
 492         if (!list_empty(&cmd->i_conn_node) &&
 493             !(cmd->se_cmd.transport_state & CMD_T_FABRIC_STOP))
 494                 list_del_init(&cmd->i_conn_node);
 495         spin_unlock_bh(&conn->cmd_lock);
 496
 497         __iscsit_free_cmd(cmd, true);
 498 }
 499 EXPORT_SYMBOL(iscsit_aborted_task);
 500
 501 static void iscsit_do_crypto_hash_buf(struct ahash_request *, const void *,
 502                                       u32, u32, u8 *, u8 *);
 503 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *);
 504
 505 static int
 506 iscsit_xmit_nondatain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 507                           const void *data_buf, u32 data_buf_len)
 508 {
 509         struct iscsi_hdr *hdr = (struct iscsi_hdr *)cmd->pdu;
 510         struct kvec *iov;
 511         u32 niov = 0, tx_size = ISCSI_HDR_LEN;
 512         int ret;
 513
 514         iov = &cmd->iov_misc[0];
 515         iov[niov].iov_base      = cmd->pdu;
 516         iov[niov++].iov_len     = ISCSI_HDR_LEN;
 517
 518         if (conn->conn_ops->HeaderDigest) {
 519                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
 520
 521                 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, hdr,
 522                                           ISCSI_HDR_LEN, 0, NULL,
 523                                           (u8 *)header_digest);
 524
 525                 iov[0].iov_len += ISCSI_CRC_LEN;
 526                 tx_size += ISCSI_CRC_LEN;
 527                 pr_debug("Attaching CRC32C HeaderDigest"
 528                          " to opcode 0x%x 0x%08x\n",
 529                          hdr->opcode, *header_digest);
 530         }
 531
 532         if (data_buf_len) {
 533                 u32 padding = ((-data_buf_len) & 3);
 534
 535                 iov[niov].iov_base      = (void *)data_buf;
 536                 iov[niov++].iov_len     = data_buf_len;
 537                 tx_size += data_buf_len;
 538
 539                 if (padding != 0) {
 540                         iov[niov].iov_base = &cmd->pad_bytes;
 541                         iov[niov++].iov_len = padding;
 542                         tx_size += padding;
 543                         pr_debug("Attaching %u additional"
 544                                  " padding bytes.\n", padding);
 545                 }
 546
 547                 if (conn->conn_ops->DataDigest) {
 548                         iscsit_do_crypto_hash_buf(conn->conn_tx_hash,
 549                                                   data_buf, data_buf_len,
 550                                                   padding,
 551                                                   (u8 *)&cmd->pad_bytes,
 552                                                   (u8 *)&cmd->data_crc);
 553
 554                         iov[niov].iov_base = &cmd->data_crc;
 555                         iov[niov++].iov_len = ISCSI_CRC_LEN;
 556                         tx_size += ISCSI_CRC_LEN;
 557                         pr_debug("Attached DataDigest for %u"
 558                                  " bytes opcode 0x%x, CRC 0x%08x\n",
 559                                  data_buf_len, hdr->opcode, cmd->data_crc);
 560                 }
 561         }
 562
 563         cmd->iov_misc_count = niov;
 564         cmd->tx_size = tx_size;
 565
 566         ret = iscsit_send_tx_data(cmd, conn, 1);
 567         if (ret < 0) {
 568                 iscsit_tx_thread_wait_for_tcp(conn);
 569                 return ret;
 570         }
 571
 572         return 0;
 573 }
 574
 575 static int iscsit_map_iovec(struct iscsi_cmd *, struct kvec *, u32, u32);
 576 static void iscsit_unmap_iovec(struct iscsi_cmd *);
 577 static u32 iscsit_do_crypto_hash_sg(struct ahash_request *, struct iscsi_cmd *,
 578                                     u32, u32, u32, u8 *);
 579 static int
 580 iscsit_xmit_datain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 581                        const struct iscsi_datain *datain)
 582 {
 583         struct kvec *iov;
 584         u32 iov_count = 0, tx_size = 0;
 585         int ret, iov_ret;
 586
 587         iov = &cmd->iov_data[0];
 588         iov[iov_count].iov_base = cmd->pdu;
 589         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
 590         tx_size += ISCSI_HDR_LEN;
 591
 592         if (conn->conn_ops->HeaderDigest) {
 593                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
 594
 595                 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, cmd->pdu,
 596                                           ISCSI_HDR_LEN, 0, NULL,
 597                                           (u8 *)header_digest);
 598
 599                 iov[0].iov_len += ISCSI_CRC_LEN;
 600                 tx_size += ISCSI_CRC_LEN;
 601
 602                 pr_debug("Attaching CRC32 HeaderDigest for DataIN PDU 0x%08x\n",
 603                          *header_digest);
 604         }
 605
 606         iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
 607                                    datain->offset, datain->length);
 608         if (iov_ret < 0)
 609                 return -1;
 610
 611         iov_count += iov_ret;
 612         tx_size += datain->length;
 613
 614         cmd->padding = ((-datain->length) & 3);
 615         if (cmd->padding) {
 616                 iov[iov_count].iov_base         = cmd->pad_bytes;
 617                 iov[iov_count++].iov_len        = cmd->padding;
 618                 tx_size += cmd->padding;
 619
 620                 pr_debug("Attaching %u padding bytes\n", cmd->padding);
 621         }
 622
 623         if (conn->conn_ops->DataDigest) {
 624                 cmd->data_crc = iscsit_do_crypto_hash_sg(conn->conn_tx_hash,
 625                                                          cmd, datain->offset,
 626                                                          datain->length,
 627                                                          cmd->padding,
 628                                                          cmd->pad_bytes);
 629
 630                 iov[iov_count].iov_base = &cmd->data_crc;
 631                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
 632                 tx_size += ISCSI_CRC_LEN;
 633
 634                 pr_debug("Attached CRC32C DataDigest %d bytes, crc 0x%08x\n",
 635                          datain->length + cmd->padding, cmd->data_crc);
 636         }
 637
 638         cmd->iov_data_count = iov_count;
 639         cmd->tx_size = tx_size;
 640
 641         ret = iscsit_fe_sendpage_sg(cmd, conn);
 642
 643         iscsit_unmap_iovec(cmd);
 644
 645         if (ret < 0) {
 646                 iscsit_tx_thread_wait_for_tcp(conn);
 647                 return ret;
 648         }
 649
 650         return 0;
 651 }
 652
 653 static int iscsit_xmit_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 654                            struct iscsi_datain_req *dr, const void *buf,
 655                            u32 buf_len)
 656 {
 657         if (dr)
 658                 return iscsit_xmit_datain_pdu(conn, cmd, buf);
 659         else
 660                 return iscsit_xmit_nondatain_pdu(conn, cmd, buf, buf_len);
 661 }
 662
 663 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn)
 664 {
 665         return TARGET_PROT_NORMAL;
 666 }
 667
 668 static struct iscsit_transport iscsi_target_transport = {
 669         .name                   = "iSCSI/TCP",
 670         .transport_type         = ISCSI_TCP,
 671         .rdma_shutdown          = false,
 672         .owner                  = NULL,
 673         .iscsit_setup_np        = iscsit_setup_np,
 674         .iscsit_accept_np       = iscsit_accept_np,
 675         .iscsit_free_np         = iscsit_free_np,
 676         .iscsit_get_login_rx    = iscsit_get_login_rx,
 677         .iscsit_put_login_tx    = iscsit_put_login_tx,
 678         .iscsit_get_dataout     = iscsit_build_r2ts_for_cmd,
 679         .iscsit_immediate_queue = iscsit_immediate_queue,
 680         .iscsit_response_queue  = iscsit_response_queue,
 681         .iscsit_queue_data_in   = iscsit_queue_rsp,
 682         .iscsit_queue_status    = iscsit_queue_rsp,
 683         .iscsit_aborted_task    = iscsit_aborted_task,
 684         .iscsit_xmit_pdu        = iscsit_xmit_pdu,
 685         .iscsit_get_rx_pdu      = iscsit_get_rx_pdu,
 686         .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops,
 687 };
 688
 689 static int __init iscsi_target_init_module(void)
 690 {
 691         int ret = 0, size;
 692
 693         pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
 694         iscsit_global = kzalloc(sizeof(*iscsit_global), GFP_KERNEL);
 695         if (!iscsit_global)
 696                 return -1;
 697
 698         spin_lock_init(&iscsit_global->ts_bitmap_lock);
 699         mutex_init(&auth_id_lock);
 700         spin_lock_init(&sess_idr_lock);
 701         idr_init(&tiqn_idr);
 702         idr_init(&sess_idr);
 703
 704         ret = target_register_template(&iscsi_ops);
 705         if (ret)
 706                 goto out;
 707
 708         size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long);
 709         iscsit_global->ts_bitmap = vzalloc(size);
 710         if (!iscsit_global->ts_bitmap)
 711                 goto configfs_out;
 712
 713         lio_qr_cache = kmem_cache_create("lio_qr_cache",
 714                         sizeof(struct iscsi_queue_req),
 715                         __alignof__(struct iscsi_queue_req), 0, NULL);
 716         if (!lio_qr_cache) {
 717                 pr_err("nable to kmem_cache_create() for"
 718                                 " lio_qr_cache\n");
 719                 goto bitmap_out;
 720         }
 721
 722         lio_dr_cache = kmem_cache_create("lio_dr_cache",
 723                         sizeof(struct iscsi_datain_req),
 724                         __alignof__(struct iscsi_datain_req), 0, NULL);
 725         if (!lio_dr_cache) {
 726                 pr_err("Unable to kmem_cache_create() for"
 727                                 " lio_dr_cache\n");
 728                 goto qr_out;
 729         }
 730
 731         lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
 732                         sizeof(struct iscsi_ooo_cmdsn),
 733                         __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
 734         if (!lio_ooo_cache) {
 735                 pr_err("Unable to kmem_cache_create() for"
 736                                 " lio_ooo_cache\n");
 737                 goto dr_out;
 738         }
 739
 740         lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
 741                         sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
 742                         0, NULL);
 743         if (!lio_r2t_cache) {
 744                 pr_err("Unable to kmem_cache_create() for"
 745                                 " lio_r2t_cache\n");
 746                 goto ooo_out;
 747         }
 748
 749         iscsit_register_transport(&iscsi_target_transport);
 750
 751         if (iscsit_load_discovery_tpg() < 0)
 752                 goto r2t_out;
 753
 754         return ret;
 755 r2t_out:
 756         iscsit_unregister_transport(&iscsi_target_transport);
 757         kmem_cache_destroy(lio_r2t_cache);
 758 ooo_out:
 759         kmem_cache_destroy(lio_ooo_cache);
 760 dr_out:
 761         kmem_cache_destroy(lio_dr_cache);
 762 qr_out:
 763         kmem_cache_destroy(lio_qr_cache);
 764 bitmap_out:
 765         vfree(iscsit_global->ts_bitmap);
 766 configfs_out:
 767         /* XXX: this probably wants it to be it's own unwind step.. */
 768         if (iscsit_global->discovery_tpg)
 769                 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
 770         target_unregister_template(&iscsi_ops);
 771 out:
 772         kfree(iscsit_global);
 773         return -ENOMEM;
 774 }
 775
 776 static void __exit iscsi_target_cleanup_module(void)
 777 {
 778         iscsit_release_discovery_tpg();
 779         iscsit_unregister_transport(&iscsi_target_transport);
 780         kmem_cache_destroy(lio_qr_cache);
 781         kmem_cache_destroy(lio_dr_cache);
 782         kmem_cache_destroy(lio_ooo_cache);
 783         kmem_cache_destroy(lio_r2t_cache);
 784
 785         /*
 786          * Shutdown discovery sessions and disable discovery TPG
 787          */
 788         if (iscsit_global->discovery_tpg)
 789                 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
 790
 791         target_unregister_template(&iscsi_ops);
 792
 793         vfree(iscsit_global->ts_bitmap);
 794         kfree(iscsit_global);
 795 }
 796
 797 int iscsit_add_reject(
 798         struct iscsi_conn *conn,
 799         u8 reason,
 800         unsigned char *buf)
 801 {
 802         struct iscsi_cmd *cmd;
 803
 804         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
 805         if (!cmd)
 806                 return -1;
 807
 808         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 809         cmd->reject_reason = reason;
 810
 811         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 812         if (!cmd->buf_ptr) {
 813                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 814                 iscsit_free_cmd(cmd, false);
 815                 return -1;
 816         }
 817
 818         spin_lock_bh(&conn->cmd_lock);
 819         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 820         spin_unlock_bh(&conn->cmd_lock);
 821
 822         cmd->i_state = ISTATE_SEND_REJECT;
 823         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 824
 825         return -1;
 826 }
 827 EXPORT_SYMBOL(iscsit_add_reject);
 828
 829 static int iscsit_add_reject_from_cmd(
 830         struct iscsi_cmd *cmd,
 831         u8 reason,
 832         bool add_to_conn,
 833         unsigned char *buf)
 834 {
 835         struct iscsi_conn *conn;
 836
 837         if (!cmd->conn) {
 838                 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
 839                                 cmd->init_task_tag);
 840                 return -1;
 841         }
 842         conn = cmd->conn;
 843
 844         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 845         cmd->reject_reason = reason;
 846
 847         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 848         if (!cmd->buf_ptr) {
 849                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 850                 iscsit_free_cmd(cmd, false);
 851                 return -1;
 852         }
 853
 854         if (add_to_conn) {
 855                 spin_lock_bh(&conn->cmd_lock);
 856                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 857                 spin_unlock_bh(&conn->cmd_lock);
 858         }
 859
 860         cmd->i_state = ISTATE_SEND_REJECT;
 861         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 862         /*
 863          * Perform the kref_put now if se_cmd has already been setup by
 864          * scsit_setup_scsi_cmd()
 865          */
 866         if (cmd->se_cmd.se_tfo != NULL) {
 867                 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
 868                 target_put_sess_cmd(&cmd->se_cmd);
 869         }
 870         return -1;
 871 }
 872
 873 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
 874                                  unsigned char *buf)
 875 {
 876         return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
 877 }
 878
 879 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
 880 {
 881         return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
 882 }
 883 EXPORT_SYMBOL(iscsit_reject_cmd);
 884
 885 /*
 886  * Map some portion of the allocated scatterlist to an iovec, suitable for
 887  * kernel sockets to copy data in/out.
 888  */
 889 static int iscsit_map_iovec(
 890         struct iscsi_cmd *cmd,
 891         struct kvec *iov,
 892         u32 data_offset,
 893         u32 data_length)
 894 {
 895         u32 i = 0;
 896         struct scatterlist *sg;
 897         unsigned int page_off;
 898
 899         /*
 900          * We know each entry in t_data_sg contains a page.
 901          */
 902         u32 ent = data_offset / PAGE_SIZE;
 903
 904         if (ent >= cmd->se_cmd.t_data_nents) {
 905                 pr_err("Initial page entry out-of-bounds\n");
 906                 return -1;
 907         }
 908
 909         sg = &cmd->se_cmd.t_data_sg[ent];
 910         page_off = (data_offset % PAGE_SIZE);
 911
 912         cmd->first_data_sg = sg;
 913         cmd->first_data_sg_off = page_off;
 914
 915         while (data_length) {
 916                 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
 917
 918                 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
 919                 iov[i].iov_len = cur_len;
 920
 921                 data_length -= cur_len;
 922                 page_off = 0;
 923                 sg = sg_next(sg);
 924                 i++;
 925         }
 926
 927         cmd->kmapped_nents = i;
 928
 929         return i;
 930 }
 931
 932 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
 933 {
 934         u32 i;
 935         struct scatterlist *sg;
 936
 937         sg = cmd->first_data_sg;
 938
 939         for (i = 0; i < cmd->kmapped_nents; i++)
 940                 kunmap(sg_page(&sg[i]));
 941 }
 942
 943 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
 944 {
 945         LIST_HEAD(ack_list);
 946         struct iscsi_cmd *cmd, *cmd_p;
 947
 948         conn->exp_statsn = exp_statsn;
 949
 950         if (conn->sess->sess_ops->RDMAExtensions)
 951                 return;
 952
 953         spin_lock_bh(&conn->cmd_lock);
 954         list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
 955                 spin_lock(&cmd->istate_lock);
 956                 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
 957                     iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
 958                         cmd->i_state = ISTATE_REMOVE;
 959                         spin_unlock(&cmd->istate_lock);
 960                         list_move_tail(&cmd->i_conn_node, &ack_list);
 961                         continue;
 962                 }
 963                 spin_unlock(&cmd->istate_lock);
 964         }
 965         spin_unlock_bh(&conn->cmd_lock);
 966
 967         list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
 968                 list_del_init(&cmd->i_conn_node);
 969                 iscsit_free_cmd(cmd, false);
 970         }
 971 }
 972
 973 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
 974 {
 975         u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
 976
 977         iov_count += ISCSI_IOV_DATA_BUFFER;
 978         cmd->iov_data = kcalloc(iov_count, sizeof(*cmd->iov_data), GFP_KERNEL);
 979         if (!cmd->iov_data)
 980                 return -ENOMEM;
 981
 982         cmd->orig_iov_data_count = iov_count;
 983         return 0;
 984 }
 985
 986 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 987                           unsigned char *buf)
 988 {
 989         int data_direction, payload_length;
 990         struct iscsi_scsi_req *hdr;
 991         int iscsi_task_attr;
 992         int sam_task_attr;
 993
 994         atomic_long_inc(&conn->sess->cmd_pdus);
 995
 996         hdr                     = (struct iscsi_scsi_req *) buf;
 997         payload_length          = ntoh24(hdr->dlength);
 998
 999         /* FIXME; Add checks for AdditionalHeaderSegment */
1000
1001         if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
1002             !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1003                 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
1004                                 " not set. Bad iSCSI Initiator.\n");
1005                 return iscsit_add_reject_cmd(cmd,
1006                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1007         }
1008
1009         if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
1010              (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
1011                 /*
1012                  * From RFC-3720 Section 10.3.1:
1013                  *
1014                  * "Either or both of R and W MAY be 1 when either the
1015                  *  Expected Data Transfer Length and/or Bidirectional Read
1016                  *  Expected Data Transfer Length are 0"
1017                  *
1018                  * For this case, go ahead and clear the unnecssary bits
1019                  * to avoid any confusion with ->data_direction.
1020                  */
1021                 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
1022                 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
1023
1024                 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
1025                         " set when Expected Data Transfer Length is 0 for"
1026                         " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
1027         }
1028
1029         if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
1030             !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
1031                 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
1032                         " MUST be set if Expected Data Transfer Length is not 0."
1033                         " Bad iSCSI Initiator\n");
1034                 return iscsit_add_reject_cmd(cmd,
1035                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1036         }
1037
1038         if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
1039             (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
1040                 pr_err("Bidirectional operations not supported!\n");
1041                 return iscsit_add_reject_cmd(cmd,
1042                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1043         }
1044
1045         if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1046                 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
1047                                 " Scsi Command PDU.\n");
1048                 return iscsit_add_reject_cmd(cmd,
1049                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1050         }
1051
1052         if (payload_length && !conn->sess->sess_ops->ImmediateData) {
1053                 pr_err("ImmediateData=No but DataSegmentLength=%u,"
1054                         " protocol error.\n", payload_length);
1055                 return iscsit_add_reject_cmd(cmd,
1056                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1057         }
1058
1059         if ((be32_to_cpu(hdr->data_length) == payload_length) &&
1060             (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
1061                 pr_err("Expected Data Transfer Length and Length of"
1062                         " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
1063                         " bit is not set protocol error\n");
1064                 return iscsit_add_reject_cmd(cmd,
1065                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1066         }
1067
1068         if (payload_length > be32_to_cpu(hdr->data_length)) {
1069                 pr_err("DataSegmentLength: %u is greater than"
1070                         " EDTL: %u, protocol error.\n", payload_length,
1071                                 hdr->data_length);
1072                 return iscsit_add_reject_cmd(cmd,
1073                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1074         }
1075
1076         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1077                 pr_err("DataSegmentLength: %u is greater than"
1078                         " MaxXmitDataSegmentLength: %u, protocol error.\n",
1079                         payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1080                 return iscsit_add_reject_cmd(cmd,
1081                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1082         }
1083
1084         if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
1085                 pr_err("DataSegmentLength: %u is greater than"
1086                         " FirstBurstLength: %u, protocol error.\n",
1087                         payload_length, conn->sess->sess_ops->FirstBurstLength);
1088                 return iscsit_add_reject_cmd(cmd,
1089                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1090         }
1091
1092         data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
1093                          (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
1094                           DMA_NONE;
1095
1096         cmd->data_direction = data_direction;
1097         iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
1098         /*
1099          * Figure out the SAM Task Attribute for the incoming SCSI CDB
1100          */
1101         if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
1102             (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
1103                 sam_task_attr = TCM_SIMPLE_TAG;
1104         else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
1105                 sam_task_attr = TCM_ORDERED_TAG;
1106         else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
1107                 sam_task_attr = TCM_HEAD_TAG;
1108         else if (iscsi_task_attr == ISCSI_ATTR_ACA)
1109                 sam_task_attr = TCM_ACA_TAG;
1110         else {
1111                 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
1112                         " TCM_SIMPLE_TAG\n", iscsi_task_attr);
1113                 sam_task_attr = TCM_SIMPLE_TAG;
1114         }
1115
1116         cmd->iscsi_opcode       = ISCSI_OP_SCSI_CMD;
1117         cmd->i_state            = ISTATE_NEW_CMD;
1118         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1119         cmd->immediate_data     = (payload_length) ? 1 : 0;
1120         cmd->unsolicited_data   = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
1121                                      (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
1122         if (cmd->unsolicited_data)
1123                 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
1124
1125         conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1126         if (hdr->flags & ISCSI_FLAG_CMD_READ)
1127                 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
1128         else
1129                 cmd->targ_xfer_tag = 0xFFFFFFFF;
1130         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1131         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1132         cmd->first_burst_len    = payload_length;
1133
1134         if (!conn->sess->sess_ops->RDMAExtensions &&
1135              cmd->data_direction == DMA_FROM_DEVICE) {
1136                 struct iscsi_datain_req *dr;
1137
1138                 dr = iscsit_allocate_datain_req();
1139                 if (!dr)
1140                         return iscsit_add_reject_cmd(cmd,
1141                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1142
1143                 iscsit_attach_datain_req(cmd, dr);
1144         }
1145
1146         /*
1147          * Initialize struct se_cmd descriptor from target_core_mod infrastructure
1148          */
1149         transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1150                         conn->sess->se_sess, be32_to_cpu(hdr->data_length),
1151                         cmd->data_direction, sam_task_attr,
1152                         cmd->sense_buffer + 2);
1153
1154         pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1155                 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
1156                 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1157                 conn->cid);
1158
1159         target_get_sess_cmd(&cmd->se_cmd, true);
1160
1161         cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
1162                                                      scsilun_to_int(&hdr->lun));
1163         if (cmd->sense_reason)
1164                 goto attach_cmd;
1165
1166         /* only used for printks or comparing with ->ref_task_tag */
1167         cmd->se_cmd.tag = (__force u32)cmd->init_task_tag;
1168         cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1169         if (cmd->sense_reason) {
1170                 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1171                         return iscsit_add_reject_cmd(cmd,
1172                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1173                 }
1174
1175                 goto attach_cmd;
1176         }
1177
1178         if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1179                 return iscsit_add_reject_cmd(cmd,
1180                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1181         }
1182
1183 attach_cmd:
1184         spin_lock_bh(&conn->cmd_lock);
1185         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1186         spin_unlock_bh(&conn->cmd_lock);
1187         /*
1188          * Check if we need to delay processing because of ALUA
1189          * Active/NonOptimized primary access state..
1190          */
1191         core_alua_check_nonop_delay(&cmd->se_cmd);
1192
1193         return 0;
1194 }
1195 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1196
1197 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1198 {
1199         iscsit_set_dataout_sequence_values(cmd);
1200
1201         spin_lock_bh(&cmd->dataout_timeout_lock);
1202         iscsit_start_dataout_timer(cmd, cmd->conn);
1203         spin_unlock_bh(&cmd->dataout_timeout_lock);
1204 }
1205 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1206
1207 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1208                             struct iscsi_scsi_req *hdr)
1209 {
1210         int cmdsn_ret = 0;
1211         /*
1212          * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1213          * the Immediate Bit is not set, and no Immediate
1214          * Data is attached.
1215          *
1216          * A PDU/CmdSN carrying Immediate Data can only
1217          * be processed after the DataCRC has passed.
1218          * If the DataCRC fails, the CmdSN MUST NOT
1219          * be acknowledged. (See below)
1220          */
1221         if (!cmd->immediate_data) {
1222                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1223                                         (unsigned char *)hdr, hdr->cmdsn);
1224                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1225                         return -1;
1226                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1227                         target_put_sess_cmd(&cmd->se_cmd);
1228                         return 0;
1229                 }
1230         }
1231
1232         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1233
1234         /*
1235          * If no Immediate Data is attached, it's OK to return now.
1236          */
1237         if (!cmd->immediate_data) {
1238                 if (!cmd->sense_reason && cmd->unsolicited_data)
1239                         iscsit_set_unsoliticed_dataout(cmd);
1240                 if (!cmd->sense_reason)
1241                         return 0;
1242
1243                 target_put_sess_cmd(&cmd->se_cmd);
1244                 return 0;
1245         }
1246
1247         /*
1248          * Early CHECK_CONDITIONs with ImmediateData never make it to command
1249          * execution.  These exceptions are processed in CmdSN order using
1250          * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1251          */
1252         if (cmd->sense_reason)
1253                 return 1;
1254         /*
1255          * Call directly into transport_generic_new_cmd() to perform
1256          * the backend memory allocation.
1257          */
1258         cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1259         if (cmd->sense_reason)
1260                 return 1;
1261
1262         return 0;
1263 }
1264 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1265
1266 static int
1267 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1268                           bool dump_payload)
1269 {
1270         int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1271         /*
1272          * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1273          */
1274         if (dump_payload)
1275                 goto after_immediate_data;
1276         /*
1277          * Check for underflow case where both EDTL and immediate data payload
1278          * exceeds what is presented by CDB's TRANSFER LENGTH, and what has
1279          * already been set in target_cmd_size_check() as se_cmd->data_length.
1280          *
1281          * For this special case, fail the command and dump the immediate data
1282          * payload.
1283          */
1284         if (cmd->first_burst_len > cmd->se_cmd.data_length) {
1285                 cmd->sense_reason = TCM_INVALID_CDB_FIELD;
1286                 goto after_immediate_data;
1287         }
1288
1289         immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1290                                         cmd->first_burst_len);
1291 after_immediate_data:
1292         if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1293                 /*
1294                  * A PDU/CmdSN carrying Immediate Data passed
1295                  * DataCRC, check against ExpCmdSN/MaxCmdSN if
1296                  * Immediate Bit is not set.
1297                  */
1298                 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1299                                         (unsigned char *)hdr, hdr->cmdsn);
1300                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1301                         return -1;
1302
1303                 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1304                         int rc;
1305
1306                         rc = iscsit_dump_data_payload(cmd->conn,
1307                                                       cmd->first_burst_len, 1);
1308                         target_put_sess_cmd(&cmd->se_cmd);
1309                         return rc;
1310                 } else if (cmd->unsolicited_data)
1311                         iscsit_set_unsoliticed_dataout(cmd);
1312
1313         } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1314                 /*
1315                  * Immediate Data failed DataCRC and ERL>=1,
1316                  * silently drop this PDU and let the initiator
1317                  * plug the CmdSN gap.
1318                  *
1319                  * FIXME: Send Unsolicited NOPIN with reserved
1320                  * TTT here to help the initiator figure out
1321                  * the missing CmdSN, although they should be
1322                  * intelligent enough to determine the missing
1323                  * CmdSN and issue a retry to plug the sequence.
1324                  */
1325                 cmd->i_state = ISTATE_REMOVE;
1326                 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1327         } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1328                 return -1;
1329
1330         return 0;
1331 }
1332
1333 static int
1334 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1335                            unsigned char *buf)
1336 {
1337         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1338         int rc, immed_data;
1339         bool dump_payload = false;
1340
1341         rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1342         if (rc < 0)
1343                 return 0;
1344         /*
1345          * Allocation iovecs needed for struct socket operations for
1346          * traditional iSCSI block I/O.
1347          */
1348         if (iscsit_allocate_iovecs(cmd) < 0) {
1349                 return iscsit_reject_cmd(cmd,
1350                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1351         }
1352         immed_data = cmd->immediate_data;
1353
1354         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1355         if (rc < 0)
1356                 return rc;
1357         else if (rc > 0)
1358                 dump_payload = true;
1359
1360         if (!immed_data)
1361                 return 0;
1362
1363         return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1364 }
1365
1366 static u32 iscsit_do_crypto_hash_sg(
1367         struct ahash_request *hash,
1368         struct iscsi_cmd *cmd,
1369         u32 data_offset,
1370         u32 data_length,
1371         u32 padding,
1372         u8 *pad_bytes)
1373 {
1374         u32 data_crc;
1375         struct scatterlist *sg;
1376         unsigned int page_off;
1377
1378         crypto_ahash_init(hash);
1379
1380         sg = cmd->first_data_sg;
1381         page_off = cmd->first_data_sg_off;
1382
1383         while (data_length) {
1384                 u32 cur_len = min_t(u32, data_length, (sg->length - page_off));
1385
1386                 ahash_request_set_crypt(hash, sg, NULL, cur_len);
1387                 crypto_ahash_update(hash);
1388
1389                 data_length -= cur_len;
1390                 page_off = 0;
1391                 /* iscsit_map_iovec has already checked for invalid sg pointers */
1392                 sg = sg_next(sg);
1393         }
1394
1395         if (padding) {
1396                 struct scatterlist pad_sg;
1397
1398                 sg_init_one(&pad_sg, pad_bytes, padding);
1399                 ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc,
1400                                         padding);
1401                 crypto_ahash_finup(hash);
1402         } else {
1403                 ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0);
1404                 crypto_ahash_final(hash);
1405         }
1406
1407         return data_crc;
1408 }
1409
1410 static void iscsit_do_crypto_hash_buf(
1411         struct ahash_request *hash,
1412         const void *buf,
1413         u32 payload_length,
1414         u32 padding,
1415         u8 *pad_bytes,
1416         u8 *data_crc)
1417 {
1418         struct scatterlist sg[2];
1419
1420         sg_init_table(sg, ARRAY_SIZE(sg));
1421         sg_set_buf(sg, buf, payload_length);
1422         sg_set_buf(sg + 1, pad_bytes, padding);
1423
1424         ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding);
1425
1426         crypto_ahash_digest(hash);
1427 }
1428
1429 int
1430 __iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1431                            struct iscsi_cmd *cmd, u32 payload_length,
1432                            bool *success)
1433 {
1434         struct iscsi_data *hdr = buf;
1435         struct se_cmd *se_cmd;
1436         int rc;
1437
1438         /* iSCSI write */
1439         atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1440
1441         pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1442                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1443                 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1444                 payload_length, conn->cid);
1445
1446         if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1447                 pr_err("Command ITT: 0x%08x received DataOUT after"
1448                         " last DataOUT received, dumping payload\n",
1449                         cmd->init_task_tag);
1450                 return iscsit_dump_data_payload(conn, payload_length, 1);
1451         }
1452
1453         if (cmd->data_direction != DMA_TO_DEVICE) {
1454                 pr_err("Command ITT: 0x%08x received DataOUT for a"
1455                         " NON-WRITE command.\n", cmd->init_task_tag);
1456                 return iscsit_dump_data_payload(conn, payload_length, 1);
1457         }
1458         se_cmd = &cmd->se_cmd;
1459         iscsit_mod_dataout_timer(cmd);
1460
1461         if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1462                 pr_err("DataOut Offset: %u, Length %u greater than"
1463                         " iSCSI Command EDTL %u, protocol error.\n",
1464                         hdr->offset, payload_length, cmd->se_cmd.data_length);
1465                 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1466         }
1467
1468         if (cmd->unsolicited_data) {
1469                 int dump_unsolicited_data = 0;
1470
1471                 if (conn->sess->sess_ops->InitialR2T) {
1472                         pr_err("Received unexpected unsolicited data"
1473                                 " while InitialR2T=Yes, protocol error.\n");
1474                         transport_send_check_condition_and_sense(&cmd->se_cmd,
1475                                         TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1476                         return -1;
1477                 }
1478                 /*
1479                  * Special case for dealing with Unsolicited DataOUT
1480                  * and Unsupported SAM WRITE Opcodes and SE resource allocation
1481                  * failures;
1482                  */
1483
1484                 /* Something's amiss if we're not in WRITE_PENDING state... */
1485                 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1486                 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1487                         dump_unsolicited_data = 1;
1488
1489                 if (dump_unsolicited_data) {
1490                         /*
1491                          * Check if a delayed TASK_ABORTED status needs to
1492                          * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1493                          * received with the unsolicited data out.
1494                          */
1495                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1496                                 iscsit_stop_dataout_timer(cmd);
1497
1498                         transport_check_aborted_status(se_cmd,
1499                                         (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1500                         return iscsit_dump_data_payload(conn, payload_length, 1);
1501                 }
1502         } else {
1503                 /*
1504                  * For the normal solicited data path:
1505                  *
1506                  * Check for a delayed TASK_ABORTED status and dump any
1507                  * incoming data out payload if one exists.  Also, when the
1508                  * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1509                  * data out sequence, we decrement outstanding_r2ts.  Once
1510                  * outstanding_r2ts reaches zero, go ahead and send the delayed
1511                  * TASK_ABORTED status.
1512                  */
1513                 if (se_cmd->transport_state & CMD_T_ABORTED) {
1514                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1515                                 if (--cmd->outstanding_r2ts < 1) {
1516                                         iscsit_stop_dataout_timer(cmd);
1517                                         transport_check_aborted_status(
1518                                                         se_cmd, 1);
1519                                 }
1520
1521                         return iscsit_dump_data_payload(conn, payload_length, 1);
1522                 }
1523         }
1524         /*
1525          * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1526          * within-command recovery checks before receiving the payload.
1527          */
1528         rc = iscsit_check_pre_dataout(cmd, buf);
1529         if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1530                 return 0;
1531         else if (rc == DATAOUT_CANNOT_RECOVER)
1532                 return -1;
1533         *success = true;
1534         return 0;
1535 }
1536 EXPORT_SYMBOL(__iscsit_check_dataout_hdr);
1537
1538 int
1539 iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1540                          struct iscsi_cmd **out_cmd)
1541 {
1542         struct iscsi_data *hdr = buf;
1543         struct iscsi_cmd *cmd;
1544         u32 payload_length = ntoh24(hdr->dlength);
1545         int rc;
1546         bool success = false;
1547
1548         if (!payload_length) {
1549                 pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n");
1550                 return 0;
1551         }
1552
1553         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1554                 pr_err_ratelimited("DataSegmentLength: %u is greater than"
1555                         " MaxXmitDataSegmentLength: %u\n", payload_length,
1556                         conn->conn_ops->MaxXmitDataSegmentLength);
1557                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf);
1558         }
1559
1560         cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, payload_length);
1561         if (!cmd)
1562                 return 0;
1563
1564         rc = __iscsit_check_dataout_hdr(conn, buf, cmd, payload_length, &success);
1565
1566         if (success)
1567                 *out_cmd = cmd;
1568
1569         return rc;
1570 }
1571 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1572
1573 static int
1574 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1575                    struct iscsi_data *hdr)
1576 {
1577         struct kvec *iov;
1578         u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1579         u32 payload_length = ntoh24(hdr->dlength);
1580         int iov_ret, data_crc_failed = 0;
1581
1582         rx_size += payload_length;
1583         iov = &cmd->iov_data[0];
1584
1585         iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1586                                    payload_length);
1587         if (iov_ret < 0)
1588                 return -1;
1589
1590         iov_count += iov_ret;
1591
1592         padding = ((-payload_length) & 3);
1593         if (padding != 0) {
1594                 iov[iov_count].iov_base = cmd->pad_bytes;
1595                 iov[iov_count++].iov_len = padding;
1596                 rx_size += padding;
1597                 pr_debug("Receiving %u padding bytes.\n", padding);
1598         }
1599
1600         if (conn->conn_ops->DataDigest) {
1601                 iov[iov_count].iov_base = &checksum;
1602                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1603                 rx_size += ISCSI_CRC_LEN;
1604         }
1605
1606         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1607
1608         iscsit_unmap_iovec(cmd);
1609
1610         if (rx_got != rx_size)
1611                 return -1;
1612
1613         if (conn->conn_ops->DataDigest) {
1614                 u32 data_crc;
1615
1616                 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
1617                                                     be32_to_cpu(hdr->offset),
1618                                                     payload_length, padding,
1619                                                     cmd->pad_bytes);
1620
1621                 if (checksum != data_crc) {
1622                         pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1623                                 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1624                                 " does not match computed 0x%08x\n",
1625                                 hdr->itt, hdr->offset, payload_length,
1626                                 hdr->datasn, checksum, data_crc);
1627                         data_crc_failed = 1;
1628                 } else {
1629                         pr_debug("Got CRC32C DataDigest 0x%08x for"
1630                                 " %u bytes of Data Out\n", checksum,
1631                                 payload_length);
1632                 }
1633         }
1634
1635         return data_crc_failed;
1636 }
1637
1638 int
1639 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1640                              bool data_crc_failed)
1641 {
1642         struct iscsi_conn *conn = cmd->conn;
1643         int rc, ooo_cmdsn;
1644         /*
1645          * Increment post receive data and CRC values or perform
1646          * within-command recovery.
1647          */
1648         rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1649         if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1650                 return 0;
1651         else if (rc == DATAOUT_SEND_R2T) {
1652                 iscsit_set_dataout_sequence_values(cmd);
1653                 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1654         } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1655                 /*
1656                  * Handle extra special case for out of order
1657                  * Unsolicited Data Out.
1658                  */
1659                 spin_lock_bh(&cmd->istate_lock);
1660                 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1661                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1662                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1663                 spin_unlock_bh(&cmd->istate_lock);
1664
1665                 iscsit_stop_dataout_timer(cmd);
1666                 if (ooo_cmdsn)
1667                         return 0;
1668                 target_execute_cmd(&cmd->se_cmd);
1669                 return 0;
1670         } else /* DATAOUT_CANNOT_RECOVER */
1671                 return -1;
1672
1673         return 0;
1674 }
1675 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1676
1677 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1678 {
1679         struct iscsi_cmd *cmd = NULL;
1680         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1681         int rc;
1682         bool data_crc_failed = false;
1683
1684         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1685         if (rc < 0)
1686                 return 0;
1687         else if (!cmd)
1688                 return 0;
1689
1690         rc = iscsit_get_dataout(conn, cmd, hdr);
1691         if (rc < 0)
1692                 return rc;
1693         else if (rc > 0)
1694                 data_crc_failed = true;
1695
1696         return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1697 }
1698
1699 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1700                          struct iscsi_nopout *hdr)
1701 {
1702         u32 payload_length = ntoh24(hdr->dlength);
1703
1704         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1705                 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1706                 if (!cmd)
1707                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1708                                                  (unsigned char *)hdr);
1709
1710                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1711                                          (unsigned char *)hdr);
1712         }
1713
1714         if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1715                 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1716                         " not set, protocol error.\n");
1717                 if (!cmd)
1718                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1719                                                  (unsigned char *)hdr);
1720
1721                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1722                                          (unsigned char *)hdr);
1723         }
1724
1725         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1726                 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1727                         " greater than MaxXmitDataSegmentLength: %u, protocol"
1728                         " error.\n", payload_length,
1729                         conn->conn_ops->MaxXmitDataSegmentLength);
1730                 if (!cmd)
1731                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1732                                                  (unsigned char *)hdr);
1733
1734                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1735                                          (unsigned char *)hdr);
1736         }
1737
1738         pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1739                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1740                 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1741                 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1742                 payload_length);
1743         /*
1744          * This is not a response to a Unsolicited NopIN, which means
1745          * it can either be a NOPOUT ping request (with a valid ITT),
1746          * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1747          * Either way, make sure we allocate an struct iscsi_cmd, as both
1748          * can contain ping data.
1749          */
1750         if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1751                 cmd->iscsi_opcode       = ISCSI_OP_NOOP_OUT;
1752                 cmd->i_state            = ISTATE_SEND_NOPIN;
1753                 cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1754                                                 1 : 0);
1755                 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1756                 cmd->targ_xfer_tag      = 0xFFFFFFFF;
1757                 cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1758                 cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1759                 cmd->data_direction     = DMA_NONE;
1760         }
1761
1762         return 0;
1763 }
1764 EXPORT_SYMBOL(iscsit_setup_nop_out);
1765
1766 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1767                            struct iscsi_nopout *hdr)
1768 {
1769         struct iscsi_cmd *cmd_p = NULL;
1770         int cmdsn_ret = 0;
1771         /*
1772          * Initiator is expecting a NopIN ping reply..
1773          */
1774         if (hdr->itt != RESERVED_ITT) {
1775                 if (!cmd)
1776                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1777                                                 (unsigned char *)hdr);
1778
1779                 spin_lock_bh(&conn->cmd_lock);
1780                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1781                 spin_unlock_bh(&conn->cmd_lock);
1782
1783                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1784
1785                 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1786                         iscsit_add_cmd_to_response_queue(cmd, conn,
1787                                                          cmd->i_state);
1788                         return 0;
1789                 }
1790
1791                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1792                                 (unsigned char *)hdr, hdr->cmdsn);
1793                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1794                         return 0;
1795                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1796                         return -1;
1797
1798                 return 0;
1799         }
1800         /*
1801          * This was a response to a unsolicited NOPIN ping.
1802          */
1803         if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1804                 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1805                 if (!cmd_p)
1806                         return -EINVAL;
1807
1808                 iscsit_stop_nopin_response_timer(conn);
1809
1810                 cmd_p->i_state = ISTATE_REMOVE;
1811                 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1812
1813                 iscsit_start_nopin_timer(conn);
1814                 return 0;
1815         }
1816         /*
1817          * Otherwise, initiator is not expecting a NOPIN is response.
1818          * Just ignore for now.
1819          */
1820
1821         if (cmd)
1822                 iscsit_free_cmd(cmd, false);
1823
1824         return 0;
1825 }
1826 EXPORT_SYMBOL(iscsit_process_nop_out);
1827
1828 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1829                                  unsigned char *buf)
1830 {
1831         unsigned char *ping_data = NULL;
1832         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1833         struct kvec *iov = NULL;
1834         u32 payload_length = ntoh24(hdr->dlength);
1835         int ret;
1836
1837         ret = iscsit_setup_nop_out(conn, cmd, hdr);
1838         if (ret < 0)
1839                 return 0;
1840         /*
1841          * Handle NOP-OUT payload for traditional iSCSI sockets
1842          */
1843         if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1844                 u32 checksum, data_crc, padding = 0;
1845                 int niov = 0, rx_got, rx_size = payload_length;
1846
1847                 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1848                 if (!ping_data) {
1849                         ret = -1;
1850                         goto out;
1851                 }
1852
1853                 iov = &cmd->iov_misc[0];
1854                 iov[niov].iov_base      = ping_data;
1855                 iov[niov++].iov_len     = payload_length;
1856
1857                 padding = ((-payload_length) & 3);
1858                 if (padding != 0) {
1859                         pr_debug("Receiving %u additional bytes"
1860                                 " for padding.\n", padding);
1861                         iov[niov].iov_base      = &cmd->pad_bytes;
1862                         iov[niov++].iov_len     = padding;
1863                         rx_size += padding;
1864                 }
1865                 if (conn->conn_ops->DataDigest) {
1866                         iov[niov].iov_base      = &checksum;
1867                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
1868                         rx_size += ISCSI_CRC_LEN;
1869                 }
1870
1871                 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1872                 if (rx_got != rx_size) {
1873                         ret = -1;
1874                         goto out;
1875                 }
1876
1877                 if (conn->conn_ops->DataDigest) {
1878                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
1879                                         ping_data, payload_length,
1880                                         padding, cmd->pad_bytes,
1881                                         (u8 *)&data_crc);
1882
1883                         if (checksum != data_crc) {
1884                                 pr_err("Ping data CRC32C DataDigest"
1885                                 " 0x%08x does not match computed 0x%08x\n",
1886                                         checksum, data_crc);
1887                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1888                                         pr_err("Unable to recover from"
1889                                         " NOPOUT Ping DataCRC failure while in"
1890                                                 " ERL=0.\n");
1891                                         ret = -1;
1892                                         goto out;
1893                                 } else {
1894                                         /*
1895                                          * Silently drop this PDU and let the
1896                                          * initiator plug the CmdSN gap.
1897                                          */
1898                                         pr_debug("Dropping NOPOUT"
1899                                         " Command CmdSN: 0x%08x due to"
1900                                         " DataCRC error.\n", hdr->cmdsn);
1901                                         ret = 0;
1902                                         goto out;
1903                                 }
1904                         } else {
1905                                 pr_debug("Got CRC32C DataDigest"
1906                                 " 0x%08x for %u bytes of ping data.\n",
1907                                         checksum, payload_length);
1908                         }
1909                 }
1910
1911                 ping_data[payload_length] = '\0';
1912                 /*
1913                  * Attach ping data to struct iscsi_cmd->buf_ptr.
1914                  */
1915                 cmd->buf_ptr = ping_data;
1916                 cmd->buf_ptr_size = payload_length;
1917
1918                 pr_debug("Got %u bytes of NOPOUT ping"
1919                         " data.\n", payload_length);
1920                 pr_debug("Ping Data: \"%s\"\n", ping_data);
1921         }
1922
1923         return iscsit_process_nop_out(conn, cmd, hdr);
1924 out:
1925         if (cmd)
1926                 iscsit_free_cmd(cmd, false);
1927
1928         kfree(ping_data);
1929         return ret;
1930 }
1931
1932 static enum tcm_tmreq_table iscsit_convert_tmf(u8 iscsi_tmf)
1933 {
1934         switch (iscsi_tmf) {
1935         case ISCSI_TM_FUNC_ABORT_TASK:
1936                 return TMR_ABORT_TASK;
1937         case ISCSI_TM_FUNC_ABORT_TASK_SET:
1938                 return TMR_ABORT_TASK_SET;
1939         case ISCSI_TM_FUNC_CLEAR_ACA:
1940                 return TMR_CLEAR_ACA;
1941         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1942                 return TMR_CLEAR_TASK_SET;
1943         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1944                 return TMR_LUN_RESET;
1945         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1946                 return TMR_TARGET_WARM_RESET;
1947         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1948                 return TMR_TARGET_COLD_RESET;
1949         default:
1950                 return TMR_UNKNOWN;
1951         }
1952 }
1953
1954 int
1955 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1956                            unsigned char *buf)
1957 {
1958         struct se_tmr_req *se_tmr;
1959         struct iscsi_tmr_req *tmr_req;
1960         struct iscsi_tm *hdr;
1961         int out_of_order_cmdsn = 0, ret;
1962         bool sess_ref = false;
1963         u8 function, tcm_function = TMR_UNKNOWN;
1964
1965         hdr                     = (struct iscsi_tm *) buf;
1966         hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1967         function = hdr->flags;
1968
1969         pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1970                 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1971                 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1972                 hdr->rtt, hdr->refcmdsn, conn->cid);
1973
1974         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1975             ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1976              hdr->rtt != RESERVED_ITT)) {
1977                 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1978                 hdr->rtt = RESERVED_ITT;
1979         }
1980
1981         if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1982                         !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1983                 pr_err("Task Management Request TASK_REASSIGN not"
1984                         " issued as immediate command, bad iSCSI Initiator"
1985                                 "implementation\n");
1986                 return iscsit_add_reject_cmd(cmd,
1987                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1988         }
1989         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1990             be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1991                 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1992
1993         cmd->data_direction = DMA_NONE;
1994         cmd->tmr_req = kzalloc(sizeof(*cmd->tmr_req), GFP_KERNEL);
1995         if (!cmd->tmr_req)
1996                 return iscsit_add_reject_cmd(cmd,
1997                                              ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1998                                              buf);
1999
2000         /*
2001          * TASK_REASSIGN for ERL=2 / connection stays inside of
2002          * LIO-Target $FABRIC_MOD
2003          */
2004         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2005                 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
2006                                       conn->sess->se_sess, 0, DMA_NONE,
2007                                       TCM_SIMPLE_TAG, cmd->sense_buffer + 2);
2008
2009                 target_get_sess_cmd(&cmd->se_cmd, true);
2010                 sess_ref = true;
2011                 tcm_function = iscsit_convert_tmf(function);
2012                 if (tcm_function == TMR_UNKNOWN) {
2013                         pr_err("Unknown iSCSI TMR Function:"
2014                                " 0x%02x\n", function);
2015                         return iscsit_add_reject_cmd(cmd,
2016                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2017                 }
2018         }
2019         ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function,
2020                                  GFP_KERNEL);
2021         if (ret < 0)
2022                 return iscsit_add_reject_cmd(cmd,
2023                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2024
2025         cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
2026
2027         cmd->iscsi_opcode       = ISCSI_OP_SCSI_TMFUNC;
2028         cmd->i_state            = ISTATE_SEND_TASKMGTRSP;
2029         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2030         cmd->init_task_tag      = hdr->itt;
2031         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2032         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2033         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2034         se_tmr                  = cmd->se_cmd.se_tmr_req;
2035         tmr_req                 = cmd->tmr_req;
2036         /*
2037          * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
2038          */
2039         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2040                 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
2041                                                scsilun_to_int(&hdr->lun));
2042                 if (ret < 0) {
2043                         se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
2044                         goto attach;
2045                 }
2046         }
2047
2048         switch (function) {
2049         case ISCSI_TM_FUNC_ABORT_TASK:
2050                 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
2051                 if (se_tmr->response)
2052                         goto attach;
2053                 break;
2054         case ISCSI_TM_FUNC_ABORT_TASK_SET:
2055         case ISCSI_TM_FUNC_CLEAR_ACA:
2056         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
2057         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
2058                 break;
2059         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2060                 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
2061                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2062                         goto attach;
2063                 }
2064                 break;
2065         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2066                 if (iscsit_tmr_task_cold_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_TASK_REASSIGN:
2072                 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
2073                 /*
2074                  * Perform sanity checks on the ExpDataSN only if the
2075                  * TASK_REASSIGN was successful.
2076                  */
2077                 if (se_tmr->response)
2078                         break;
2079
2080                 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
2081                         return iscsit_add_reject_cmd(cmd,
2082                                         ISCSI_REASON_BOOKMARK_INVALID, buf);
2083                 break;
2084         default:
2085                 pr_err("Unknown TMR function: 0x%02x, protocol"
2086                         " error.\n", function);
2087                 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
2088                 goto attach;
2089         }
2090
2091         if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
2092             (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
2093                 se_tmr->call_transport = 1;
2094 attach:
2095         spin_lock_bh(&conn->cmd_lock);
2096         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2097         spin_unlock_bh(&conn->cmd_lock);
2098
2099         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2100                 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2101                 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
2102                         out_of_order_cmdsn = 1;
2103                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2104                         return 0;
2105                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2106                         return -1;
2107         }
2108         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2109
2110         if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
2111                 return 0;
2112         /*
2113          * Found the referenced task, send to transport for processing.
2114          */
2115         if (se_tmr->call_transport)
2116                 return transport_generic_handle_tmr(&cmd->se_cmd);
2117
2118         /*
2119          * Could not find the referenced LUN, task, or Task Management
2120          * command not authorized or supported.  Change state and
2121          * let the tx_thread send the response.
2122          *
2123          * For connection recovery, this is also the default action for
2124          * TMR TASK_REASSIGN.
2125          */
2126         if (sess_ref) {
2127                 pr_debug("Handle TMR, using sess_ref=true check\n");
2128                 target_put_sess_cmd(&cmd->se_cmd);
2129         }
2130
2131         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2132         return 0;
2133 }
2134 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
2135
2136 /* #warning FIXME: Support Text Command parameters besides SendTargets */
2137 int
2138 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2139                       struct iscsi_text *hdr)
2140 {
2141         u32 payload_length = ntoh24(hdr->dlength);
2142
2143         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
2144                 pr_err("Unable to accept text parameter length: %u"
2145                         "greater than MaxXmitDataSegmentLength %u.\n",
2146                        payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
2147                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2148                                          (unsigned char *)hdr);
2149         }
2150
2151         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
2152              (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
2153                 pr_err("Multi sequence text commands currently not supported\n");
2154                 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
2155                                         (unsigned char *)hdr);
2156         }
2157
2158         pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
2159                 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
2160                 hdr->exp_statsn, payload_length);
2161
2162         cmd->iscsi_opcode       = ISCSI_OP_TEXT;
2163         cmd->i_state            = ISTATE_SEND_TEXTRSP;
2164         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2165         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2166         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2167         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2168         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2169         cmd->data_direction     = DMA_NONE;
2170         cmd->text_in_ptr        = NULL;
2171
2172         return 0;
2173 }
2174 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2175
2176 int
2177 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2178                         struct iscsi_text *hdr)
2179 {
2180         unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2181         int cmdsn_ret;
2182
2183         if (!text_in) {
2184                 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2185                 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2186                         pr_err("Unable to locate text_in buffer for sendtargets"
2187                                " discovery\n");
2188                         goto reject;
2189                 }
2190                 goto empty_sendtargets;
2191         }
2192         if (strncmp("SendTargets", text_in, 11) != 0) {
2193                 pr_err("Received Text Data that is not"
2194                         " SendTargets, cannot continue.\n");
2195                 goto reject;
2196         }
2197         text_ptr = strchr(text_in, '=');
2198         if (!text_ptr) {
2199                 pr_err("No \"=\" separator found in Text Data,"
2200                         "  cannot continue.\n");
2201                 goto reject;
2202         }
2203         if (!strncmp("=All", text_ptr, 4)) {
2204                 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2205         } else if (!strncmp("=iqn.", text_ptr, 5) ||
2206                    !strncmp("=eui.", text_ptr, 5)) {
2207                 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2208         } else {
2209                 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2210                 goto reject;
2211         }
2212
2213         spin_lock_bh(&conn->cmd_lock);
2214         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2215         spin_unlock_bh(&conn->cmd_lock);
2216
2217 empty_sendtargets:
2218         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2219
2220         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2221                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2222                                 (unsigned char *)hdr, hdr->cmdsn);
2223                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2224                         return -1;
2225
2226                 return 0;
2227         }
2228
2229         return iscsit_execute_cmd(cmd, 0);
2230
2231 reject:
2232         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2233                                  (unsigned char *)hdr);
2234 }
2235 EXPORT_SYMBOL(iscsit_process_text_cmd);
2236
2237 static int
2238 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2239                        unsigned char *buf)
2240 {
2241         struct iscsi_text *hdr = (struct iscsi_text *)buf;
2242         char *text_in = NULL;
2243         u32 payload_length = ntoh24(hdr->dlength);
2244         int rx_size, rc;
2245
2246         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2247         if (rc < 0)
2248                 return 0;
2249
2250         rx_size = payload_length;
2251         if (payload_length) {
2252                 u32 checksum = 0, data_crc = 0;
2253                 u32 padding = 0, pad_bytes = 0;
2254                 int niov = 0, rx_got;
2255                 struct kvec iov[3];
2256
2257                 text_in = kzalloc(payload_length, GFP_KERNEL);
2258                 if (!text_in)
2259                         goto reject;
2260
2261                 cmd->text_in_ptr = text_in;
2262
2263                 memset(iov, 0, 3 * sizeof(struct kvec));
2264                 iov[niov].iov_base      = text_in;
2265                 iov[niov++].iov_len     = payload_length;
2266
2267                 padding = ((-payload_length) & 3);
2268                 if (padding != 0) {
2269                         iov[niov].iov_base = &pad_bytes;
2270                         iov[niov++].iov_len  = padding;
2271                         rx_size += padding;
2272                         pr_debug("Receiving %u additional bytes"
2273                                         " for padding.\n", padding);
2274                 }
2275                 if (conn->conn_ops->DataDigest) {
2276                         iov[niov].iov_base      = &checksum;
2277                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
2278                         rx_size += ISCSI_CRC_LEN;
2279                 }
2280
2281                 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2282                 if (rx_got != rx_size)
2283                         goto reject;
2284
2285                 if (conn->conn_ops->DataDigest) {
2286                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
2287                                         text_in, payload_length,
2288                                         padding, (u8 *)&pad_bytes,
2289                                         (u8 *)&data_crc);
2290
2291                         if (checksum != data_crc) {
2292                                 pr_err("Text data CRC32C DataDigest"
2293                                         " 0x%08x does not match computed"
2294                                         " 0x%08x\n", checksum, data_crc);
2295                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2296                                         pr_err("Unable to recover from"
2297                                         " Text Data digest failure while in"
2298                                                 " ERL=0.\n");
2299                                         goto reject;
2300                                 } else {
2301                                         /*
2302                                          * Silently drop this PDU and let the
2303                                          * initiator plug the CmdSN gap.
2304                                          */
2305                                         pr_debug("Dropping Text"
2306                                         " Command CmdSN: 0x%08x due to"
2307                                         " DataCRC error.\n", hdr->cmdsn);
2308                                         kfree(text_in);
2309                                         return 0;
2310                                 }
2311                         } else {
2312                                 pr_debug("Got CRC32C DataDigest"
2313                                         " 0x%08x for %u bytes of text data.\n",
2314                                                 checksum, payload_length);
2315                         }
2316                 }
2317                 text_in[payload_length - 1] = '\0';
2318                 pr_debug("Successfully read %d bytes of text"
2319                                 " data.\n", payload_length);
2320         }
2321
2322         return iscsit_process_text_cmd(conn, cmd, hdr);
2323
2324 reject:
2325         kfree(cmd->text_in_ptr);
2326         cmd->text_in_ptr = NULL;
2327         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2328 }
2329
2330 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2331 {
2332         struct iscsi_conn *conn_p;
2333         struct iscsi_session *sess = conn->sess;
2334
2335         pr_debug("Received logout request CLOSESESSION on CID: %hu"
2336                 " for SID: %u.\n", conn->cid, conn->sess->sid);
2337
2338         atomic_set(&sess->session_logout, 1);
2339         atomic_set(&conn->conn_logout_remove, 1);
2340         conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2341
2342         iscsit_inc_conn_usage_count(conn);
2343         iscsit_inc_session_usage_count(sess);
2344
2345         spin_lock_bh(&sess->conn_lock);
2346         list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2347                 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2348                         continue;
2349
2350                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2351                 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2352         }
2353         spin_unlock_bh(&sess->conn_lock);
2354
2355         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2356
2357         return 0;
2358 }
2359
2360 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2361 {
2362         struct iscsi_conn *l_conn;
2363         struct iscsi_session *sess = conn->sess;
2364
2365         pr_debug("Received logout request CLOSECONNECTION for CID:"
2366                 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2367
2368         /*
2369          * A Logout Request with a CLOSECONNECTION reason code for a CID
2370          * can arrive on a connection with a differing CID.
2371          */
2372         if (conn->cid == cmd->logout_cid) {
2373                 spin_lock_bh(&conn->state_lock);
2374                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2375                 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2376
2377                 atomic_set(&conn->conn_logout_remove, 1);
2378                 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2379                 iscsit_inc_conn_usage_count(conn);
2380
2381                 spin_unlock_bh(&conn->state_lock);
2382         } else {
2383                 /*
2384                  * Handle all different cid CLOSECONNECTION requests in
2385                  * iscsit_logout_post_handler_diffcid() as to give enough
2386                  * time for any non immediate command's CmdSN to be
2387                  * acknowledged on the connection in question.
2388                  *
2389                  * Here we simply make sure the CID is still around.
2390                  */
2391                 l_conn = iscsit_get_conn_from_cid(sess,
2392                                 cmd->logout_cid);
2393                 if (!l_conn) {
2394                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2395                         iscsit_add_cmd_to_response_queue(cmd, conn,
2396                                         cmd->i_state);
2397                         return 0;
2398                 }
2399
2400                 iscsit_dec_conn_usage_count(l_conn);
2401         }
2402
2403         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2404
2405         return 0;
2406 }
2407
2408 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2409 {
2410         struct iscsi_session *sess = conn->sess;
2411
2412         pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2413                 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2414
2415         if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2416                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2417                         " while ERL!=2.\n");
2418                 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2419                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2420                 return 0;
2421         }
2422
2423         if (conn->cid == cmd->logout_cid) {
2424                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2425                         " with CID: %hu on CID: %hu, implementation error.\n",
2426                                 cmd->logout_cid, conn->cid);
2427                 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2428                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2429                 return 0;
2430         }
2431
2432         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2433
2434         return 0;
2435 }
2436
2437 int
2438 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2439                         unsigned char *buf)
2440 {
2441         int cmdsn_ret, logout_remove = 0;
2442         u8 reason_code = 0;
2443         struct iscsi_logout *hdr;
2444         struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2445
2446         hdr                     = (struct iscsi_logout *) buf;
2447         reason_code             = (hdr->flags & 0x7f);
2448
2449         if (tiqn) {
2450                 spin_lock(&tiqn->logout_stats.lock);
2451                 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2452                         tiqn->logout_stats.normal_logouts++;
2453                 else
2454                         tiqn->logout_stats.abnormal_logouts++;
2455                 spin_unlock(&tiqn->logout_stats.lock);
2456         }
2457
2458         pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2459                 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2460                 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2461                 hdr->cid, conn->cid);
2462
2463         if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2464                 pr_err("Received logout request on connection that"
2465                         " is not in logged in state, ignoring request.\n");
2466                 iscsit_free_cmd(cmd, false);
2467                 return 0;
2468         }
2469
2470         cmd->iscsi_opcode       = ISCSI_OP_LOGOUT;
2471         cmd->i_state            = ISTATE_SEND_LOGOUTRSP;
2472         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2473         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2474         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2475         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2476         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2477         cmd->logout_cid         = be16_to_cpu(hdr->cid);
2478         cmd->logout_reason      = reason_code;
2479         cmd->data_direction     = DMA_NONE;
2480
2481         /*
2482          * We need to sleep in these cases (by returning 1) until the Logout
2483          * Response gets sent in the tx thread.
2484          */
2485         if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2486            ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2487             be16_to_cpu(hdr->cid) == conn->cid))
2488                 logout_remove = 1;
2489
2490         spin_lock_bh(&conn->cmd_lock);
2491         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2492         spin_unlock_bh(&conn->cmd_lock);
2493
2494         if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2495                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2496
2497         /*
2498          * Immediate commands are executed, well, immediately.
2499          * Non-Immediate Logout Commands are executed in CmdSN order.
2500          */
2501         if (cmd->immediate_cmd) {
2502                 int ret = iscsit_execute_cmd(cmd, 0);
2503
2504                 if (ret < 0)
2505                         return ret;
2506         } else {
2507                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2508                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2509                         logout_remove = 0;
2510                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2511                         return -1;
2512         }
2513
2514         return logout_remove;
2515 }
2516 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2517
2518 int iscsit_handle_snack(
2519         struct iscsi_conn *conn,
2520         unsigned char *buf)
2521 {
2522         struct iscsi_snack *hdr;
2523
2524         hdr                     = (struct iscsi_snack *) buf;
2525         hdr->flags              &= ~ISCSI_FLAG_CMD_FINAL;
2526
2527         pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2528                 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2529                 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2530                         hdr->begrun, hdr->runlength, conn->cid);
2531
2532         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2533                 pr_err("Initiator sent SNACK request while in"
2534                         " ErrorRecoveryLevel=0.\n");
2535                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2536                                          buf);
2537         }
2538         /*
2539          * SNACK_DATA and SNACK_R2T are both 0,  so check which function to
2540          * call from inside iscsi_send_recovery_datain_or_r2t().
2541          */
2542         switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2543         case 0:
2544                 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2545                         hdr->itt,
2546                         be32_to_cpu(hdr->ttt),
2547                         be32_to_cpu(hdr->begrun),
2548                         be32_to_cpu(hdr->runlength));
2549         case ISCSI_FLAG_SNACK_TYPE_STATUS:
2550                 return iscsit_handle_status_snack(conn, hdr->itt,
2551                         be32_to_cpu(hdr->ttt),
2552                         be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2553         case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2554                 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2555                         be32_to_cpu(hdr->begrun),
2556                         be32_to_cpu(hdr->runlength));
2557         case ISCSI_FLAG_SNACK_TYPE_RDATA:
2558                 /* FIXME: Support R-Data SNACK */
2559                 pr_err("R-Data SNACK Not Supported.\n");
2560                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2561                                          buf);
2562         default:
2563                 pr_err("Unknown SNACK type 0x%02x, protocol"
2564                         " error.\n", hdr->flags & 0x0f);
2565                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2566                                          buf);
2567         }
2568
2569         return 0;
2570 }
2571 EXPORT_SYMBOL(iscsit_handle_snack);
2572
2573 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2574 {
2575         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2576             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2577                 wait_for_completion_interruptible_timeout(
2578                                         &conn->rx_half_close_comp,
2579                                         ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2580         }
2581 }
2582
2583 static int iscsit_handle_immediate_data(
2584         struct iscsi_cmd *cmd,
2585         struct iscsi_scsi_req *hdr,
2586         u32 length)
2587 {
2588         int iov_ret, rx_got = 0, rx_size = 0;
2589         u32 checksum, iov_count = 0, padding = 0;
2590         struct iscsi_conn *conn = cmd->conn;
2591         struct kvec *iov;
2592
2593         iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2594         if (iov_ret < 0)
2595                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2596
2597         rx_size = length;
2598         iov_count = iov_ret;
2599         iov = &cmd->iov_data[0];
2600
2601         padding = ((-length) & 3);
2602         if (padding != 0) {
2603                 iov[iov_count].iov_base = cmd->pad_bytes;
2604                 iov[iov_count++].iov_len = padding;
2605                 rx_size += padding;
2606         }
2607
2608         if (conn->conn_ops->DataDigest) {
2609                 iov[iov_count].iov_base         = &checksum;
2610                 iov[iov_count++].iov_len        = ISCSI_CRC_LEN;
2611                 rx_size += ISCSI_CRC_LEN;
2612         }
2613
2614         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2615
2616         iscsit_unmap_iovec(cmd);
2617
2618         if (rx_got != rx_size) {
2619                 iscsit_rx_thread_wait_for_tcp(conn);
2620                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2621         }
2622
2623         if (conn->conn_ops->DataDigest) {
2624                 u32 data_crc;
2625
2626                 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
2627                                                     cmd->write_data_done, length, padding,
2628                                                     cmd->pad_bytes);
2629
2630                 if (checksum != data_crc) {
2631                         pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2632                                 " does not match computed 0x%08x\n", checksum,
2633                                 data_crc);
2634
2635                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2636                                 pr_err("Unable to recover from"
2637                                         " Immediate Data digest failure while"
2638                                         " in ERL=0.\n");
2639                                 iscsit_reject_cmd(cmd,
2640                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2641                                                 (unsigned char *)hdr);
2642                                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2643                         } else {
2644                                 iscsit_reject_cmd(cmd,
2645                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2646                                                 (unsigned char *)hdr);
2647                                 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2648                         }
2649                 } else {
2650                         pr_debug("Got CRC32C DataDigest 0x%08x for"
2651                                 " %u bytes of Immediate Data\n", checksum,
2652                                 length);
2653                 }
2654         }
2655
2656         cmd->write_data_done += length;
2657
2658         if (cmd->write_data_done == cmd->se_cmd.data_length) {
2659                 spin_lock_bh(&cmd->istate_lock);
2660                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2661                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2662                 spin_unlock_bh(&cmd->istate_lock);
2663         }
2664
2665         return IMMEDIATE_DATA_NORMAL_OPERATION;
2666 }
2667
2668 /*
2669  *      Called with sess->conn_lock held.
2670  */
2671 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2672         with active network interface */
2673 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2674 {
2675         struct iscsi_cmd *cmd;
2676         struct iscsi_conn *conn_p;
2677         bool found = false;
2678
2679         /*
2680          * Only send a Asynchronous Message on connections whos network
2681          * interface is still functional.
2682          */
2683         list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2684                 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2685                         iscsit_inc_conn_usage_count(conn_p);
2686                         found = true;
2687                         break;
2688                 }
2689         }
2690
2691         if (!found)
2692                 return;
2693
2694         cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2695         if (!cmd) {
2696                 iscsit_dec_conn_usage_count(conn_p);
2697                 return;
2698         }
2699
2700         cmd->logout_cid = conn->cid;
2701         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2702         cmd->i_state = ISTATE_SEND_ASYNCMSG;
2703
2704         spin_lock_bh(&conn_p->cmd_lock);
2705         list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2706         spin_unlock_bh(&conn_p->cmd_lock);
2707
2708         iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2709         iscsit_dec_conn_usage_count(conn_p);
2710 }
2711
2712 static int iscsit_send_conn_drop_async_message(
2713         struct iscsi_cmd *cmd,
2714         struct iscsi_conn *conn)
2715 {
2716         struct iscsi_async *hdr;
2717
2718         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2719
2720         hdr                     = (struct iscsi_async *) cmd->pdu;
2721         hdr->opcode             = ISCSI_OP_ASYNC_EVENT;
2722         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
2723         cmd->init_task_tag      = RESERVED_ITT;
2724         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2725         put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2726         cmd->stat_sn            = conn->stat_sn++;
2727         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2728         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2729         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2730         hdr->async_event        = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2731         hdr->param1             = cpu_to_be16(cmd->logout_cid);
2732         hdr->param2             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2733         hdr->param3             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2734
2735         pr_debug("Sending Connection Dropped Async Message StatSN:"
2736                 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2737                         cmd->logout_cid, conn->cid);
2738
2739         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2740 }
2741
2742 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2743 {
2744         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2745             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2746                 wait_for_completion_interruptible_timeout(
2747                                         &conn->tx_half_close_comp,
2748                                         ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2749         }
2750 }
2751
2752 void
2753 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2754                         struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2755                         bool set_statsn)
2756 {
2757         hdr->opcode             = ISCSI_OP_SCSI_DATA_IN;
2758         hdr->flags              = datain->flags;
2759         if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2760                 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2761                         hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2762                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2763                 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2764                         hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2765                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2766                 }
2767         }
2768         hton24(hdr->dlength, datain->length);
2769         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2770                 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2771                                 (struct scsi_lun *)&hdr->lun);
2772         else
2773                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2774
2775         hdr->itt                = cmd->init_task_tag;
2776
2777         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2778                 hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2779         else
2780                 hdr->ttt                = cpu_to_be32(0xFFFFFFFF);
2781         if (set_statsn)
2782                 hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2783         else
2784                 hdr->statsn             = cpu_to_be32(0xFFFFFFFF);
2785
2786         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2787         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2788         hdr->datasn             = cpu_to_be32(datain->data_sn);
2789         hdr->offset             = cpu_to_be32(datain->offset);
2790
2791         pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2792                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2793                 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2794                 ntohl(hdr->offset), datain->length, conn->cid);
2795 }
2796 EXPORT_SYMBOL(iscsit_build_datain_pdu);
2797
2798 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2799 {
2800         struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2801         struct iscsi_datain datain;
2802         struct iscsi_datain_req *dr;
2803         int eodr = 0, ret;
2804         bool set_statsn = false;
2805
2806         memset(&datain, 0, sizeof(struct iscsi_datain));
2807         dr = iscsit_get_datain_values(cmd, &datain);
2808         if (!dr) {
2809                 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2810                                 cmd->init_task_tag);
2811                 return -1;
2812         }
2813         /*
2814          * Be paranoid and double check the logic for now.
2815          */
2816         if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2817                 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2818                         " datain.length: %u exceeds cmd->data_length: %u\n",
2819                         cmd->init_task_tag, datain.offset, datain.length,
2820                         cmd->se_cmd.data_length);
2821                 return -1;
2822         }
2823
2824         atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2825         /*
2826          * Special case for successfully execution w/ both DATAIN
2827          * and Sense Data.
2828          */
2829         if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2830             (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2831                 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2832         else {
2833                 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2834                     (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2835                         iscsit_increment_maxcmdsn(cmd, conn->sess);
2836                         cmd->stat_sn = conn->stat_sn++;
2837                         set_statsn = true;
2838                 } else if (dr->dr_complete ==
2839                            DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2840                         set_statsn = true;
2841         }
2842
2843         iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2844
2845         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0);
2846         if (ret < 0)
2847                 return ret;
2848
2849         if (dr->dr_complete) {
2850                 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2851                                 2 : 1;
2852                 iscsit_free_datain_req(cmd, dr);
2853         }
2854
2855         return eodr;
2856 }
2857
2858 int
2859 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2860                         struct iscsi_logout_rsp *hdr)
2861 {
2862         struct iscsi_conn *logout_conn = NULL;
2863         struct iscsi_conn_recovery *cr = NULL;
2864         struct iscsi_session *sess = conn->sess;
2865         /*
2866          * The actual shutting down of Sessions and/or Connections
2867          * for CLOSESESSION and CLOSECONNECTION Logout Requests
2868          * is done in scsi_logout_post_handler().
2869          */
2870         switch (cmd->logout_reason) {
2871         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2872                 pr_debug("iSCSI session logout successful, setting"
2873                         " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2874                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2875                 break;
2876         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2877                 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2878                         break;
2879                 /*
2880                  * For CLOSECONNECTION logout requests carrying
2881                  * a matching logout CID -> local CID, the reference
2882                  * for the local CID will have been incremented in
2883                  * iscsi_logout_closeconnection().
2884                  *
2885                  * For CLOSECONNECTION logout requests carrying
2886                  * a different CID than the connection it arrived
2887                  * on, the connection responding to cmd->logout_cid
2888                  * is stopped in iscsit_logout_post_handler_diffcid().
2889                  */
2890
2891                 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2892                         " successful.\n", cmd->logout_cid, conn->cid);
2893                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2894                 break;
2895         case ISCSI_LOGOUT_REASON_RECOVERY:
2896                 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2897                     (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2898                         break;
2899                 /*
2900                  * If the connection is still active from our point of view
2901                  * force connection recovery to occur.
2902                  */
2903                 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2904                                 cmd->logout_cid);
2905                 if (logout_conn) {
2906                         iscsit_connection_reinstatement_rcfr(logout_conn);
2907                         iscsit_dec_conn_usage_count(logout_conn);
2908                 }
2909
2910                 cr = iscsit_get_inactive_connection_recovery_entry(
2911                                 conn->sess, cmd->logout_cid);
2912                 if (!cr) {
2913                         pr_err("Unable to locate CID: %hu for"
2914                         " REMOVECONNFORRECOVERY Logout Request.\n",
2915                                 cmd->logout_cid);
2916                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2917                         break;
2918                 }
2919
2920                 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2921
2922                 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2923                         " for recovery for CID: %hu on CID: %hu successful.\n",
2924                                 cmd->logout_cid, conn->cid);
2925                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2926                 break;
2927         default:
2928                 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2929                                 cmd->logout_reason);
2930                 return -1;
2931         }
2932
2933         hdr->opcode             = ISCSI_OP_LOGOUT_RSP;
2934         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2935         hdr->response           = cmd->logout_response;
2936         hdr->itt                = cmd->init_task_tag;
2937         cmd->stat_sn            = conn->stat_sn++;
2938         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2939
2940         iscsit_increment_maxcmdsn(cmd, conn->sess);
2941         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2942         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2943
2944         pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2945                 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2946                 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2947                 cmd->logout_cid, conn->cid);
2948
2949         return 0;
2950 }
2951 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2952
2953 static int
2954 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2955 {
2956         int rc;
2957
2958         rc = iscsit_build_logout_rsp(cmd, conn,
2959                         (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2960         if (rc < 0)
2961                 return rc;
2962
2963         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2964 }
2965
2966 void
2967 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2968                        struct iscsi_nopin *hdr, bool nopout_response)
2969 {
2970         hdr->opcode             = ISCSI_OP_NOOP_IN;
2971         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2972         hton24(hdr->dlength, cmd->buf_ptr_size);
2973         if (nopout_response)
2974                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2975         hdr->itt                = cmd->init_task_tag;
2976         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2977         cmd->stat_sn            = (nopout_response) ? conn->stat_sn++ :
2978                                   conn->stat_sn;
2979         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2980
2981         if (nopout_response)
2982                 iscsit_increment_maxcmdsn(cmd, conn->sess);
2983
2984         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2985         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2986
2987         pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
2988                 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
2989                 "Solicited" : "Unsolicited", cmd->init_task_tag,
2990                 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
2991 }
2992 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
2993
2994 /*
2995  *      Unsolicited NOPIN, either requesting a response or not.
2996  */
2997 static int iscsit_send_unsolicited_nopin(
2998         struct iscsi_cmd *cmd,
2999         struct iscsi_conn *conn,
3000         int want_response)
3001 {
3002         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3003         int ret;
3004
3005         iscsit_build_nopin_rsp(cmd, conn, hdr, false);
3006
3007         pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
3008                 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
3009
3010         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3011         if (ret < 0)
3012                 return ret;
3013
3014         spin_lock_bh(&cmd->istate_lock);
3015         cmd->i_state = want_response ?
3016                 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
3017         spin_unlock_bh(&cmd->istate_lock);
3018
3019         return 0;
3020 }
3021
3022 static int
3023 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3024 {
3025         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3026
3027         iscsit_build_nopin_rsp(cmd, conn, hdr, true);
3028
3029         /*
3030          * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
3031          * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
3032          */
3033         pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size);
3034
3035         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3036                                                      cmd->buf_ptr,
3037                                                      cmd->buf_ptr_size);
3038 }
3039
3040 static int iscsit_send_r2t(
3041         struct iscsi_cmd *cmd,
3042         struct iscsi_conn *conn)
3043 {
3044         struct iscsi_r2t *r2t;
3045         struct iscsi_r2t_rsp *hdr;
3046         int ret;
3047
3048         r2t = iscsit_get_r2t_from_list(cmd);
3049         if (!r2t)
3050                 return -1;
3051
3052         hdr                     = (struct iscsi_r2t_rsp *) cmd->pdu;
3053         memset(hdr, 0, ISCSI_HDR_LEN);
3054         hdr->opcode             = ISCSI_OP_R2T;
3055         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3056         int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3057                         (struct scsi_lun *)&hdr->lun);
3058         hdr->itt                = cmd->init_task_tag;
3059         if (conn->conn_transport->iscsit_get_r2t_ttt)
3060                 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t);
3061         else
3062                 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
3063         hdr->ttt                = cpu_to_be32(r2t->targ_xfer_tag);
3064         hdr->statsn             = cpu_to_be32(conn->stat_sn);
3065         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3066         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3067         hdr->r2tsn              = cpu_to_be32(r2t->r2t_sn);
3068         hdr->data_offset        = cpu_to_be32(r2t->offset);
3069         hdr->data_length        = cpu_to_be32(r2t->xfer_len);
3070
3071         pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3072                 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3073                 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3074                 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3075                         r2t->offset, r2t->xfer_len, conn->cid);
3076
3077         spin_lock_bh(&cmd->r2t_lock);
3078         r2t->sent_r2t = 1;
3079         spin_unlock_bh(&cmd->r2t_lock);
3080
3081         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3082         if (ret < 0) {
3083                 return ret;
3084         }
3085
3086         spin_lock_bh(&cmd->dataout_timeout_lock);
3087         iscsit_start_dataout_timer(cmd, conn);
3088         spin_unlock_bh(&cmd->dataout_timeout_lock);
3089
3090         return 0;
3091 }
3092
3093 /*
3094  *      @recovery: If called from iscsi_task_reassign_complete_write() for
3095  *              connection recovery.
3096  */
3097 int iscsit_build_r2ts_for_cmd(
3098         struct iscsi_conn *conn,
3099         struct iscsi_cmd *cmd,
3100         bool recovery)
3101 {
3102         int first_r2t = 1;
3103         u32 offset = 0, xfer_len = 0;
3104
3105         spin_lock_bh(&cmd->r2t_lock);
3106         if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3107                 spin_unlock_bh(&cmd->r2t_lock);
3108                 return 0;
3109         }
3110
3111         if (conn->sess->sess_ops->DataSequenceInOrder &&
3112             !recovery)
3113                 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3114
3115         while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3116                 if (conn->sess->sess_ops->DataSequenceInOrder) {
3117                         offset = cmd->r2t_offset;
3118
3119                         if (first_r2t && recovery) {
3120                                 int new_data_end = offset +
3121                                         conn->sess->sess_ops->MaxBurstLength -
3122                                         cmd->next_burst_len;
3123
3124                                 if (new_data_end > cmd->se_cmd.data_length)
3125                                         xfer_len = cmd->se_cmd.data_length - offset;
3126                                 else
3127                                         xfer_len =
3128                                                 conn->sess->sess_ops->MaxBurstLength -
3129                                                 cmd->next_burst_len;
3130                         } else {
3131                                 int new_data_end = offset +
3132                                         conn->sess->sess_ops->MaxBurstLength;
3133
3134                                 if (new_data_end > cmd->se_cmd.data_length)
3135                                         xfer_len = cmd->se_cmd.data_length - offset;
3136                                 else
3137                                         xfer_len = conn->sess->sess_ops->MaxBurstLength;
3138                         }
3139                         cmd->r2t_offset += xfer_len;
3140
3141                         if (cmd->r2t_offset == cmd->se_cmd.data_length)
3142                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3143                 } else {
3144                         struct iscsi_seq *seq;
3145
3146                         seq = iscsit_get_seq_holder_for_r2t(cmd);
3147                         if (!seq) {
3148                                 spin_unlock_bh(&cmd->r2t_lock);
3149                                 return -1;
3150                         }
3151
3152                         offset = seq->offset;
3153                         xfer_len = seq->xfer_len;
3154
3155                         if (cmd->seq_send_order == cmd->seq_count)
3156                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3157                 }
3158                 cmd->outstanding_r2ts++;
3159                 first_r2t = 0;
3160
3161                 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3162                         spin_unlock_bh(&cmd->r2t_lock);
3163                         return -1;
3164                 }
3165
3166                 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3167                         break;
3168         }
3169         spin_unlock_bh(&cmd->r2t_lock);
3170
3171         return 0;
3172 }
3173 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd);
3174
3175 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3176                         bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3177 {
3178         if (inc_stat_sn)
3179                 cmd->stat_sn = conn->stat_sn++;
3180
3181         atomic_long_inc(&conn->sess->rsp_pdus);
3182
3183         memset(hdr, 0, ISCSI_HDR_LEN);
3184         hdr->opcode             = ISCSI_OP_SCSI_CMD_RSP;
3185         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3186         if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3187                 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3188                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3189         } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3190                 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3191                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3192         }
3193         hdr->response           = cmd->iscsi_response;
3194         hdr->cmd_status         = cmd->se_cmd.scsi_status;
3195         hdr->itt                = cmd->init_task_tag;
3196         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3197
3198         iscsit_increment_maxcmdsn(cmd, conn->sess);
3199         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3200         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3201
3202         pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3203                 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3204                 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3205                 cmd->se_cmd.scsi_status, conn->cid);
3206 }
3207 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3208
3209 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3210 {
3211         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3212         bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3213         void *data_buf = NULL;
3214         u32 padding = 0, data_buf_len = 0;
3215
3216         iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3217
3218         /*
3219          * Attach SENSE DATA payload to iSCSI Response PDU
3220          */
3221         if (cmd->se_cmd.sense_buffer &&
3222            ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3223             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3224                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3225                 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3226
3227                 padding         = -(cmd->se_cmd.scsi_sense_length) & 3;
3228                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3229                 data_buf = cmd->sense_buffer;
3230                 data_buf_len = cmd->se_cmd.scsi_sense_length + padding;
3231
3232                 if (padding) {
3233                         memset(cmd->sense_buffer +
3234                                 cmd->se_cmd.scsi_sense_length, 0, padding);
3235                         pr_debug("Adding %u bytes of padding to"
3236                                 " SENSE.\n", padding);
3237                 }
3238
3239                 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3240                                 " Response PDU\n",
3241                                 cmd->se_cmd.scsi_sense_length);
3242         }
3243
3244         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf,
3245                                                      data_buf_len);
3246 }
3247
3248 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3249 {
3250         switch (se_tmr->response) {
3251         case TMR_FUNCTION_COMPLETE:
3252                 return ISCSI_TMF_RSP_COMPLETE;
3253         case TMR_TASK_DOES_NOT_EXIST:
3254                 return ISCSI_TMF_RSP_NO_TASK;
3255         case TMR_LUN_DOES_NOT_EXIST:
3256                 return ISCSI_TMF_RSP_NO_LUN;
3257         case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3258                 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3259         case TMR_FUNCTION_REJECTED:
3260         default:
3261                 return ISCSI_TMF_RSP_REJECTED;
3262         }
3263 }
3264
3265 void
3266 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3267                           struct iscsi_tm_rsp *hdr)
3268 {
3269         struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3270
3271         hdr->opcode             = ISCSI_OP_SCSI_TMFUNC_RSP;
3272         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
3273         hdr->response           = iscsit_convert_tcm_tmr_rsp(se_tmr);
3274         hdr->itt                = cmd->init_task_tag;
3275         cmd->stat_sn            = conn->stat_sn++;
3276         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3277
3278         iscsit_increment_maxcmdsn(cmd, conn->sess);
3279         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3280         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3281
3282         pr_debug("Built Task Management Response ITT: 0x%08x,"
3283                 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3284                 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3285 }
3286 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3287
3288 static int
3289 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3290 {
3291         struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3292
3293         iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3294
3295         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3296 }
3297
3298 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3299 {
3300         bool ret = false;
3301
3302         if (np->np_sockaddr.ss_family == AF_INET6) {
3303                 const struct sockaddr_in6 sin6 = {
3304                         .sin6_addr = IN6ADDR_ANY_INIT };
3305                 struct sockaddr_in6 *sock_in6 =
3306                          (struct sockaddr_in6 *)&np->np_sockaddr;
3307
3308                 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3309                                 sin6.sin6_addr.s6_addr, 16))
3310                         ret = true;
3311         } else {
3312                 struct sockaddr_in * sock_in =
3313                         (struct sockaddr_in *)&np->np_sockaddr;
3314
3315                 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
3316                         ret = true;
3317         }
3318
3319         return ret;
3320 }
3321
3322 #define SENDTARGETS_BUF_LIMIT 32768U
3323
3324 static int
3325 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
3326                                   enum iscsit_transport_type network_transport,
3327                                   int skip_bytes, bool *completed)
3328 {
3329         char *payload = NULL;
3330         struct iscsi_conn *conn = cmd->conn;
3331         struct iscsi_portal_group *tpg;
3332         struct iscsi_tiqn *tiqn;
3333         struct iscsi_tpg_np *tpg_np;
3334         int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3335         int target_name_printed;
3336         unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3337         unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3338         bool active;
3339
3340         buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3341                          SENDTARGETS_BUF_LIMIT);
3342
3343         payload = kzalloc(buffer_len, GFP_KERNEL);
3344         if (!payload)
3345                 return -ENOMEM;
3346
3347         /*
3348          * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3349          * explicit case..
3350          */
3351         if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3352                 text_ptr = strchr(text_in, '=');
3353                 if (!text_ptr) {
3354                         pr_err("Unable to locate '=' string in text_in:"
3355                                " %s\n", text_in);
3356                         kfree(payload);
3357                         return -EINVAL;
3358                 }
3359                 /*
3360                  * Skip over '=' character..
3361                  */
3362                 text_ptr += 1;
3363         }
3364
3365         spin_lock(&tiqn_lock);
3366         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3367                 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3368                      strcmp(tiqn->tiqn, text_ptr)) {
3369                         continue;
3370                 }
3371
3372                 target_name_printed = 0;
3373
3374                 spin_lock(&tiqn->tiqn_tpg_lock);
3375                 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3376
3377                         /* If demo_mode_discovery=0 and generate_node_acls=0
3378                          * (demo mode dislabed) do not return
3379                          * TargetName+TargetAddress unless a NodeACL exists.
3380                          */
3381
3382                         if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3383                             (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3384                             (!target_tpg_has_node_acl(&tpg->tpg_se_tpg,
3385                                 cmd->conn->sess->sess_ops->InitiatorName))) {
3386                                 continue;
3387                         }
3388
3389                         spin_lock(&tpg->tpg_state_lock);
3390                         active = (tpg->tpg_state == TPG_STATE_ACTIVE);
3391                         spin_unlock(&tpg->tpg_state_lock);
3392
3393                         if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets)
3394                                 continue;
3395
3396                         spin_lock(&tpg->tpg_np_lock);
3397                         list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3398                                                 tpg_np_list) {
3399                                 struct iscsi_np *np = tpg_np->tpg_np;
3400                                 bool inaddr_any = iscsit_check_inaddr_any(np);
3401                                 struct sockaddr_storage *sockaddr;
3402
3403                                 if (np->np_network_transport != network_transport)
3404                                         continue;
3405
3406                                 if (!target_name_printed) {
3407                                         len = sprintf(buf, "TargetName=%s",
3408                                                       tiqn->tiqn);
3409                                         len += 1;
3410
3411                                         if ((len + payload_len) > buffer_len) {
3412                                                 spin_unlock(&tpg->tpg_np_lock);
3413                                                 spin_unlock(&tiqn->tiqn_tpg_lock);
3414                                                 end_of_buf = 1;
3415                                                 goto eob;
3416                                         }
3417
3418                                         if (skip_bytes && len <= skip_bytes) {
3419                                                 skip_bytes -= len;
3420                                         } else {
3421                                                 memcpy(payload + payload_len, buf, len);
3422                                                 payload_len += len;
3423                                                 target_name_printed = 1;
3424                                                 if (len > skip_bytes)
3425                                                         skip_bytes = 0;
3426                                         }
3427                                 }
3428
3429                                 if (inaddr_any)
3430                                         sockaddr = &conn->local_sockaddr;
3431                                 else
3432                                         sockaddr = &np->np_sockaddr;
3433
3434                                 len = sprintf(buf, "TargetAddress="
3435                                               "%pISpc,%hu",
3436                                               sockaddr,
3437                                               tpg->tpgt);
3438                                 len += 1;
3439
3440                                 if ((len + payload_len) > buffer_len) {
3441                                         spin_unlock(&tpg->tpg_np_lock);
3442                                         spin_unlock(&tiqn->tiqn_tpg_lock);
3443                                         end_of_buf = 1;
3444                                         goto eob;
3445                                 }
3446
3447                                 if (skip_bytes && len <= skip_bytes) {
3448                                         skip_bytes -= len;
3449                                 } else {
3450                                         memcpy(payload + payload_len, buf, len);
3451                                         payload_len += len;
3452                                         if (len > skip_bytes)
3453                                                 skip_bytes = 0;
3454                                 }
3455                         }
3456                         spin_unlock(&tpg->tpg_np_lock);
3457                 }
3458                 spin_unlock(&tiqn->tiqn_tpg_lock);
3459 eob:
3460                 if (end_of_buf) {
3461                         *completed = false;
3462                         break;
3463                 }
3464
3465                 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3466                         break;
3467         }
3468         spin_unlock(&tiqn_lock);
3469
3470         cmd->buf_ptr = payload;
3471
3472         return payload_len;
3473 }
3474
3475 int
3476 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3477                       struct iscsi_text_rsp *hdr,
3478                       enum iscsit_transport_type network_transport)
3479 {
3480         int text_length, padding;
3481         bool completed = true;
3482
3483         text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3484                                                         cmd->read_data_done,
3485                                                         &completed);
3486         if (text_length < 0)
3487                 return text_length;
3488
3489         if (completed) {
3490                 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3491         } else {
3492                 hdr->flags |= ISCSI_FLAG_TEXT_CONTINUE;
3493                 cmd->read_data_done += text_length;
3494                 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3495                         cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3496         }
3497         hdr->opcode = ISCSI_OP_TEXT_RSP;
3498         padding = ((-text_length) & 3);
3499         hton24(hdr->dlength, text_length);
3500         hdr->itt = cmd->init_task_tag;
3501         hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3502         cmd->stat_sn = conn->stat_sn++;
3503         hdr->statsn = cpu_to_be32(cmd->stat_sn);
3504
3505         iscsit_increment_maxcmdsn(cmd, conn->sess);
3506         /*
3507          * Reset maxcmdsn_inc in multi-part text payload exchanges to
3508          * correctly increment MaxCmdSN for each response answering a
3509          * non immediate text request with a valid CmdSN.
3510          */
3511         cmd->maxcmdsn_inc = 0;
3512         hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3513         hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3514
3515         pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3516                 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3517                 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3518                 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3519                 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3520
3521         return text_length + padding;
3522 }
3523 EXPORT_SYMBOL(iscsit_build_text_rsp);
3524
3525 static int iscsit_send_text_rsp(
3526         struct iscsi_cmd *cmd,
3527         struct iscsi_conn *conn)
3528 {
3529         struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3530         int text_length;
3531
3532         text_length = iscsit_build_text_rsp(cmd, conn, hdr,
3533                                 conn->conn_transport->transport_type);
3534         if (text_length < 0)
3535                 return text_length;
3536
3537         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3538                                                      cmd->buf_ptr,
3539                                                      text_length);
3540 }
3541
3542 void
3543 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3544                     struct iscsi_reject *hdr)
3545 {
3546         hdr->opcode             = ISCSI_OP_REJECT;
3547         hdr->reason             = cmd->reject_reason;
3548         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3549         hton24(hdr->dlength, ISCSI_HDR_LEN);
3550         hdr->ffffffff           = cpu_to_be32(0xffffffff);
3551         cmd->stat_sn            = conn->stat_sn++;
3552         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3553         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3554         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3555
3556 }
3557 EXPORT_SYMBOL(iscsit_build_reject);
3558
3559 static int iscsit_send_reject(
3560         struct iscsi_cmd *cmd,
3561         struct iscsi_conn *conn)
3562 {
3563         struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3564
3565         iscsit_build_reject(cmd, conn, hdr);
3566
3567         pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3568                 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3569
3570         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3571                                                      cmd->buf_ptr,
3572                                                      ISCSI_HDR_LEN);
3573 }
3574
3575 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3576 {
3577         int ord, cpu;
3578         /*
3579          * bitmap_id is assigned from iscsit_global->ts_bitmap from
3580          * within iscsit_start_kthreads()
3581          *
3582          * Here we use bitmap_id to determine which CPU that this
3583          * iSCSI connection's RX/TX threads will be scheduled to
3584          * execute upon.
3585          */
3586         ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3587         for_each_online_cpu(cpu) {
3588                 if (ord-- == 0) {
3589                         cpumask_set_cpu(cpu, conn->conn_cpumask);
3590                         return;
3591                 }
3592         }
3593         /*
3594          * This should never be reached..
3595          */
3596         dump_stack();
3597         cpumask_setall(conn->conn_cpumask);
3598 }
3599
3600 int
3601 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3602 {
3603         int ret;
3604
3605         switch (state) {
3606         case ISTATE_SEND_R2T:
3607                 ret = iscsit_send_r2t(cmd, conn);
3608                 if (ret < 0)
3609                         goto err;
3610                 break;
3611         case ISTATE_REMOVE:
3612                 spin_lock_bh(&conn->cmd_lock);
3613                 list_del_init(&cmd->i_conn_node);
3614                 spin_unlock_bh(&conn->cmd_lock);
3615
3616                 iscsit_free_cmd(cmd, false);
3617                 break;
3618         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3619                 iscsit_mod_nopin_response_timer(conn);
3620                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3621                 if (ret < 0)
3622                         goto err;
3623                 break;
3624         case ISTATE_SEND_NOPIN_NO_RESPONSE:
3625                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3626                 if (ret < 0)
3627                         goto err;
3628                 break;
3629         default:
3630                 pr_err("Unknown Opcode: 0x%02x ITT:"
3631                        " 0x%08x, i_state: %d on CID: %hu\n",
3632                        cmd->iscsi_opcode, cmd->init_task_tag, state,
3633                        conn->cid);
3634                 goto err;
3635         }
3636
3637         return 0;
3638
3639 err:
3640         return -1;
3641 }
3642 EXPORT_SYMBOL(iscsit_immediate_queue);
3643
3644 static int
3645 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3646 {
3647         struct iscsit_transport *t = conn->conn_transport;
3648         struct iscsi_queue_req *qr;
3649         struct iscsi_cmd *cmd;
3650         u8 state;
3651         int ret;
3652
3653         while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3654                 atomic_set(&conn->check_immediate_queue, 0);
3655                 cmd = qr->cmd;
3656                 state = qr->state;
3657                 kmem_cache_free(lio_qr_cache, qr);
3658
3659                 ret = t->iscsit_immediate_queue(conn, cmd, state);
3660                 if (ret < 0)
3661                         return ret;
3662         }
3663
3664         return 0;
3665 }
3666
3667 int
3668 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3669 {
3670         int ret;
3671
3672 check_rsp_state:
3673         switch (state) {
3674         case ISTATE_SEND_DATAIN:
3675                 ret = iscsit_send_datain(cmd, conn);
3676                 if (ret < 0)
3677                         goto err;
3678                 else if (!ret)
3679                         /* more drs */
3680                         goto check_rsp_state;
3681                 else if (ret == 1) {
3682                         /* all done */
3683                         spin_lock_bh(&cmd->istate_lock);
3684                         cmd->i_state = ISTATE_SENT_STATUS;
3685                         spin_unlock_bh(&cmd->istate_lock);
3686
3687                         if (atomic_read(&conn->check_immediate_queue))
3688                                 return 1;
3689
3690                         return 0;
3691                 } else if (ret == 2) {
3692                         /* Still must send status,
3693                            SCF_TRANSPORT_TASK_SENSE was set */
3694                         spin_lock_bh(&cmd->istate_lock);
3695                         cmd->i_state = ISTATE_SEND_STATUS;
3696                         spin_unlock_bh(&cmd->istate_lock);
3697                         state = ISTATE_SEND_STATUS;
3698                         goto check_rsp_state;
3699                 }
3700
3701                 break;
3702         case ISTATE_SEND_STATUS:
3703         case ISTATE_SEND_STATUS_RECOVERY:
3704                 ret = iscsit_send_response(cmd, conn);
3705                 break;
3706         case ISTATE_SEND_LOGOUTRSP:
3707                 ret = iscsit_send_logout(cmd, conn);
3708                 break;
3709         case ISTATE_SEND_ASYNCMSG:
3710                 ret = iscsit_send_conn_drop_async_message(
3711                         cmd, conn);
3712                 break;
3713         case ISTATE_SEND_NOPIN:
3714                 ret = iscsit_send_nopin(cmd, conn);
3715                 break;
3716         case ISTATE_SEND_REJECT:
3717                 ret = iscsit_send_reject(cmd, conn);
3718                 break;
3719         case ISTATE_SEND_TASKMGTRSP:
3720                 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3721                 if (ret != 0)
3722                         break;
3723                 ret = iscsit_tmr_post_handler(cmd, conn);
3724                 if (ret != 0)
3725                         iscsit_fall_back_to_erl0(conn->sess);
3726                 break;
3727         case ISTATE_SEND_TEXTRSP:
3728                 ret = iscsit_send_text_rsp(cmd, conn);
3729                 break;
3730         default:
3731                 pr_err("Unknown Opcode: 0x%02x ITT:"
3732                        " 0x%08x, i_state: %d on CID: %hu\n",
3733                        cmd->iscsi_opcode, cmd->init_task_tag,
3734                        state, conn->cid);
3735                 goto err;
3736         }
3737         if (ret < 0)
3738                 goto err;
3739
3740         switch (state) {
3741         case ISTATE_SEND_LOGOUTRSP:
3742                 if (!iscsit_logout_post_handler(cmd, conn))
3743                         return -ECONNRESET;
3744                 /* fall through */
3745         case ISTATE_SEND_STATUS:
3746         case ISTATE_SEND_ASYNCMSG:
3747         case ISTATE_SEND_NOPIN:
3748         case ISTATE_SEND_STATUS_RECOVERY:
3749         case ISTATE_SEND_TEXTRSP:
3750         case ISTATE_SEND_TASKMGTRSP:
3751         case ISTATE_SEND_REJECT:
3752                 spin_lock_bh(&cmd->istate_lock);
3753                 cmd->i_state = ISTATE_SENT_STATUS;
3754                 spin_unlock_bh(&cmd->istate_lock);
3755                 break;
3756         default:
3757                 pr_err("Unknown Opcode: 0x%02x ITT:"
3758                        " 0x%08x, i_state: %d on CID: %hu\n",
3759                        cmd->iscsi_opcode, cmd->init_task_tag,
3760                        cmd->i_state, conn->cid);
3761                 goto err;
3762         }
3763
3764         if (atomic_read(&conn->check_immediate_queue))
3765                 return 1;
3766
3767         return 0;
3768
3769 err:
3770         return -1;
3771 }
3772 EXPORT_SYMBOL(iscsit_response_queue);
3773
3774 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3775 {
3776         struct iscsit_transport *t = conn->conn_transport;
3777         struct iscsi_queue_req *qr;
3778         struct iscsi_cmd *cmd;
3779         u8 state;
3780         int ret;
3781
3782         while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3783                 cmd = qr->cmd;
3784                 state = qr->state;
3785                 kmem_cache_free(lio_qr_cache, qr);
3786
3787                 ret = t->iscsit_response_queue(conn, cmd, state);
3788                 if (ret == 1 || ret < 0)
3789                         return ret;
3790         }
3791
3792         return 0;
3793 }
3794
3795 int iscsi_target_tx_thread(void *arg)
3796 {
3797         int ret = 0;
3798         struct iscsi_conn *conn = arg;
3799         bool conn_freed = false;
3800
3801         /*
3802          * Allow ourselves to be interrupted by SIGINT so that a
3803          * connection recovery / failure event can be triggered externally.
3804          */
3805         allow_signal(SIGINT);
3806
3807         while (!kthread_should_stop()) {
3808                 /*
3809                  * Ensure that both TX and RX per connection kthreads
3810                  * are scheduled to run on the same CPU.
3811                  */
3812                 iscsit_thread_check_cpumask(conn, current, 1);
3813
3814                 wait_event_interruptible(conn->queues_wq,
3815                                          !iscsit_conn_all_queues_empty(conn));
3816
3817                 if (signal_pending(current))
3818                         goto transport_err;
3819
3820 get_immediate:
3821                 ret = iscsit_handle_immediate_queue(conn);
3822                 if (ret < 0)
3823                         goto transport_err;
3824
3825                 ret = iscsit_handle_response_queue(conn);
3826                 if (ret == 1) {
3827                         goto get_immediate;
3828                 } else if (ret == -ECONNRESET) {
3829                         conn_freed = true;
3830                         goto out;
3831                 } else if (ret < 0) {
3832                         goto transport_err;
3833                 }
3834         }
3835
3836 transport_err:
3837         /*
3838          * Avoid the normal connection failure code-path if this connection
3839          * is still within LOGIN mode, and iscsi_np process context is
3840          * responsible for cleaning up the early connection failure.
3841          */
3842         if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
3843                 iscsit_take_action_for_connection_exit(conn, &conn_freed);
3844 out:
3845         if (!conn_freed) {
3846                 while (!kthread_should_stop()) {
3847                         msleep(100);
3848                 }
3849         }
3850         return 0;
3851 }
3852
3853 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3854 {
3855         struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3856         struct iscsi_cmd *cmd;
3857         int ret = 0;
3858
3859         switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3860         case ISCSI_OP_SCSI_CMD:
3861                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3862                 if (!cmd)
3863                         goto reject;
3864
3865                 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3866                 break;
3867         case ISCSI_OP_SCSI_DATA_OUT:
3868                 ret = iscsit_handle_data_out(conn, buf);
3869                 break;
3870         case ISCSI_OP_NOOP_OUT:
3871                 cmd = NULL;
3872                 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3873                         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3874                         if (!cmd)
3875                                 goto reject;
3876                 }
3877                 ret = iscsit_handle_nop_out(conn, cmd, buf);
3878                 break;
3879         case ISCSI_OP_SCSI_TMFUNC:
3880                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3881                 if (!cmd)
3882                         goto reject;
3883
3884                 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3885                 break;
3886         case ISCSI_OP_TEXT:
3887                 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
3888                         cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
3889                         if (!cmd)
3890                                 goto reject;
3891                 } else {
3892                         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3893                         if (!cmd)
3894                                 goto reject;
3895                 }
3896
3897                 ret = iscsit_handle_text_cmd(conn, cmd, buf);
3898                 break;
3899         case ISCSI_OP_LOGOUT:
3900                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3901                 if (!cmd)
3902                         goto reject;
3903
3904                 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3905                 if (ret > 0)
3906                         wait_for_completion_timeout(&conn->conn_logout_comp,
3907                                         SECONDS_FOR_LOGOUT_COMP * HZ);
3908                 break;
3909         case ISCSI_OP_SNACK:
3910                 ret = iscsit_handle_snack(conn, buf);
3911                 break;
3912         default:
3913                 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
3914                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3915                         pr_err("Cannot recover from unknown"
3916                         " opcode while ERL=0, closing iSCSI connection.\n");
3917                         return -1;
3918                 }
3919                 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
3920                        " closing iSCSI connection.\n");
3921                 ret = -1;
3922                 break;
3923         }
3924
3925         return ret;
3926 reject:
3927         return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3928 }
3929
3930 static bool iscsi_target_check_conn_state(struct iscsi_conn *conn)
3931 {
3932         bool ret;
3933
3934         spin_lock_bh(&conn->state_lock);
3935         ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN);
3936         spin_unlock_bh(&conn->state_lock);
3937
3938         return ret;
3939 }
3940
3941 static void iscsit_get_rx_pdu(struct iscsi_conn *conn)
3942 {
3943         int ret;
3944         u8 buffer[ISCSI_HDR_LEN], opcode;
3945         u32 checksum = 0, digest = 0;
3946         struct kvec iov;
3947
3948         while (!kthread_should_stop()) {
3949                 /*
3950                  * Ensure that both TX and RX per connection kthreads
3951                  * are scheduled to run on the same CPU.
3952                  */
3953                 iscsit_thread_check_cpumask(conn, current, 0);
3954
3955                 memset(buffer, 0, ISCSI_HDR_LEN);
3956                 memset(&iov, 0, sizeof(struct kvec));
3957
3958                 iov.iov_base    = buffer;
3959                 iov.iov_len     = ISCSI_HDR_LEN;
3960
3961                 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3962                 if (ret != ISCSI_HDR_LEN) {
3963                         iscsit_rx_thread_wait_for_tcp(conn);
3964                         return;
3965                 }
3966
3967                 if (conn->conn_ops->HeaderDigest) {
3968                         iov.iov_base    = &digest;
3969                         iov.iov_len     = ISCSI_CRC_LEN;
3970
3971                         ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3972                         if (ret != ISCSI_CRC_LEN) {
3973                                 iscsit_rx_thread_wait_for_tcp(conn);
3974                                 return;
3975                         }
3976
3977                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
3978                                         buffer, ISCSI_HDR_LEN,
3979                                         0, NULL, (u8 *)&checksum);
3980
3981                         if (digest != checksum) {
3982                                 pr_err("HeaderDigest CRC32C failed,"
3983                                         " received 0x%08x, computed 0x%08x\n",
3984                                         digest, checksum);
3985                                 /*
3986                                  * Set the PDU to 0xff so it will intentionally
3987                                  * hit default in the switch below.
3988                                  */
3989                                 memset(buffer, 0xff, ISCSI_HDR_LEN);
3990                                 atomic_long_inc(&conn->sess->conn_digest_errors);
3991                         } else {
3992                                 pr_debug("Got HeaderDigest CRC32C"
3993                                                 " 0x%08x\n", checksum);
3994                         }
3995                 }
3996
3997                 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
3998                         return;
3999
4000                 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4001
4002                 if (conn->sess->sess_ops->SessionType &&
4003                    ((!(opcode & ISCSI_OP_TEXT)) ||
4004                     (!(opcode & ISCSI_OP_LOGOUT)))) {
4005                         pr_err("Received illegal iSCSI Opcode: 0x%02x"
4006                         " while in Discovery Session, rejecting.\n", opcode);
4007                         iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4008                                           buffer);
4009                         return;
4010                 }
4011
4012                 ret = iscsi_target_rx_opcode(conn, buffer);
4013                 if (ret < 0)
4014                         return;
4015         }
4016 }
4017
4018 int iscsi_target_rx_thread(void *arg)
4019 {
4020         int rc;
4021         struct iscsi_conn *conn = arg;
4022         bool conn_freed = false;
4023
4024         /*
4025          * Allow ourselves to be interrupted by SIGINT so that a
4026          * connection recovery / failure event can be triggered externally.
4027          */
4028         allow_signal(SIGINT);
4029         /*
4030          * Wait for iscsi_post_login_handler() to complete before allowing
4031          * incoming iscsi/tcp socket I/O, and/or failing the connection.
4032          */
4033         rc = wait_for_completion_interruptible(&conn->rx_login_comp);
4034         if (rc < 0 || iscsi_target_check_conn_state(conn))
4035                 goto out;
4036
4037         if (!conn->conn_transport->iscsit_get_rx_pdu)
4038                 return 0;
4039
4040         conn->conn_transport->iscsit_get_rx_pdu(conn);
4041
4042         if (!signal_pending(current))
4043                 atomic_set(&conn->transport_failed, 1);
4044         iscsit_take_action_for_connection_exit(conn, &conn_freed);
4045
4046 out:
4047         if (!conn_freed) {
4048                 while (!kthread_should_stop()) {
4049                         msleep(100);
4050                 }
4051         }
4052
4053         return 0;
4054 }
4055
4056 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4057 {
4058         LIST_HEAD(tmp_list);
4059         struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4060         struct iscsi_session *sess = conn->sess;
4061         /*
4062          * We expect this function to only ever be called from either RX or TX
4063          * thread context via iscsit_close_connection() once the other context
4064          * has been reset -> returned sleeping pre-handler state.
4065          */
4066         spin_lock_bh(&conn->cmd_lock);
4067         list_splice_init(&conn->conn_cmd_list, &tmp_list);
4068
4069         list_for_each_entry(cmd, &tmp_list, i_conn_node) {
4070                 struct se_cmd *se_cmd = &cmd->se_cmd;
4071
4072                 if (se_cmd->se_tfo != NULL) {
4073                         spin_lock(&se_cmd->t_state_lock);
4074                         se_cmd->transport_state |= CMD_T_FABRIC_STOP;
4075                         spin_unlock(&se_cmd->t_state_lock);
4076                 }
4077         }
4078         spin_unlock_bh(&conn->cmd_lock);
4079
4080         list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4081                 list_del_init(&cmd->i_conn_node);
4082
4083                 iscsit_increment_maxcmdsn(cmd, sess);
4084                 iscsit_free_cmd(cmd, true);
4085
4086         }
4087 }
4088
4089 static void iscsit_stop_timers_for_cmds(
4090         struct iscsi_conn *conn)
4091 {
4092         struct iscsi_cmd *cmd;
4093
4094         spin_lock_bh(&conn->cmd_lock);
4095         list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4096                 if (cmd->data_direction == DMA_TO_DEVICE)
4097                         iscsit_stop_dataout_timer(cmd);
4098         }
4099         spin_unlock_bh(&conn->cmd_lock);
4100 }
4101
4102 int iscsit_close_connection(
4103         struct iscsi_conn *conn)
4104 {
4105         int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4106         struct iscsi_session    *sess = conn->sess;
4107
4108         pr_debug("Closing iSCSI connection CID %hu on SID:"
4109                 " %u\n", conn->cid, sess->sid);
4110         /*
4111          * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD
4112          * case just in case the RX Thread in iscsi_target_rx_opcode() is
4113          * sleeping and the logout response never got sent because the
4114          * connection failed.
4115          *
4116          * However for iser-target, isert_wait4logout() is using conn_logout_comp
4117          * to signal logout response TX interrupt completion.  Go ahead and skip
4118          * this for iser since isert_rx_opcode() does not wait on logout failure,
4119          * and to avoid iscsi_conn pointer dereference in iser-target code.
4120          */
4121         if (!conn->conn_transport->rdma_shutdown)
4122                 complete(&conn->conn_logout_comp);
4123
4124         if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4125                 if (conn->tx_thread &&
4126                     cmpxchg(&conn->tx_thread_active, true, false)) {
4127                         send_sig(SIGINT, conn->tx_thread, 1);
4128                         kthread_stop(conn->tx_thread);
4129                 }
4130         } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4131                 if (conn->rx_thread &&
4132                     cmpxchg(&conn->rx_thread_active, true, false)) {
4133                         send_sig(SIGINT, conn->rx_thread, 1);
4134                         kthread_stop(conn->rx_thread);
4135                 }
4136         }
4137
4138         spin_lock(&iscsit_global->ts_bitmap_lock);
4139         bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4140                               get_order(1));
4141         spin_unlock(&iscsit_global->ts_bitmap_lock);
4142
4143         iscsit_stop_timers_for_cmds(conn);
4144         iscsit_stop_nopin_response_timer(conn);
4145         iscsit_stop_nopin_timer(conn);
4146
4147         if (conn->conn_transport->iscsit_wait_conn)
4148                 conn->conn_transport->iscsit_wait_conn(conn);
4149
4150         /*
4151          * During Connection recovery drop unacknowledged out of order
4152          * commands for this connection, and prepare the other commands
4153          * for reallegiance.
4154          *
4155          * During normal operation clear the out of order commands (but
4156          * do not free the struct iscsi_ooo_cmdsn's) and release all
4157          * struct iscsi_cmds.
4158          */
4159         if (atomic_read(&conn->connection_recovery)) {
4160                 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4161                 iscsit_prepare_cmds_for_reallegiance(conn);
4162         } else {
4163                 iscsit_clear_ooo_cmdsns_for_conn(conn);
4164                 iscsit_release_commands_from_conn(conn);
4165         }
4166         iscsit_free_queue_reqs_for_conn(conn);
4167
4168         /*
4169          * Handle decrementing session or connection usage count if
4170          * a logout response was not able to be sent because the
4171          * connection failed.  Fall back to Session Recovery here.
4172          */
4173         if (atomic_read(&conn->conn_logout_remove)) {
4174                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4175                         iscsit_dec_conn_usage_count(conn);
4176                         iscsit_dec_session_usage_count(sess);
4177                 }
4178                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4179                         iscsit_dec_conn_usage_count(conn);
4180
4181                 atomic_set(&conn->conn_logout_remove, 0);
4182                 atomic_set(&sess->session_reinstatement, 0);
4183                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4184         }
4185
4186         spin_lock_bh(&sess->conn_lock);
4187         list_del(&conn->conn_list);
4188
4189         /*
4190          * Attempt to let the Initiator know this connection failed by
4191          * sending an Connection Dropped Async Message on another
4192          * active connection.
4193          */
4194         if (atomic_read(&conn->connection_recovery))
4195                 iscsit_build_conn_drop_async_message(conn);
4196
4197         spin_unlock_bh(&sess->conn_lock);
4198
4199         /*
4200          * If connection reinstatement is being performed on this connection,
4201          * up the connection reinstatement semaphore that is being blocked on
4202          * in iscsit_cause_connection_reinstatement().
4203          */
4204         spin_lock_bh(&conn->state_lock);
4205         if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4206                 spin_unlock_bh(&conn->state_lock);
4207                 complete(&conn->conn_wait_comp);
4208                 wait_for_completion(&conn->conn_post_wait_comp);
4209                 spin_lock_bh(&conn->state_lock);
4210         }
4211
4212         /*
4213          * If connection reinstatement is being performed on this connection
4214          * by receiving a REMOVECONNFORRECOVERY logout request, up the
4215          * connection wait rcfr semaphore that is being blocked on
4216          * an iscsit_connection_reinstatement_rcfr().
4217          */
4218         if (atomic_read(&conn->connection_wait_rcfr)) {
4219                 spin_unlock_bh(&conn->state_lock);
4220                 complete(&conn->conn_wait_rcfr_comp);
4221                 wait_for_completion(&conn->conn_post_wait_comp);
4222                 spin_lock_bh(&conn->state_lock);
4223         }
4224         atomic_set(&conn->connection_reinstatement, 1);
4225         spin_unlock_bh(&conn->state_lock);
4226
4227         /*
4228          * If any other processes are accessing this connection pointer we
4229          * must wait until they have completed.
4230          */
4231         iscsit_check_conn_usage_count(conn);
4232
4233         ahash_request_free(conn->conn_tx_hash);
4234         if (conn->conn_rx_hash) {
4235                 struct crypto_ahash *tfm;
4236
4237                 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
4238                 ahash_request_free(conn->conn_rx_hash);
4239                 crypto_free_ahash(tfm);
4240         }
4241
4242         free_cpumask_var(conn->conn_cpumask);
4243
4244         kfree(conn->conn_ops);
4245         conn->conn_ops = NULL;
4246
4247         if (conn->sock)
4248                 sock_release(conn->sock);
4249
4250         if (conn->conn_transport->iscsit_free_conn)
4251                 conn->conn_transport->iscsit_free_conn(conn);
4252
4253         iscsit_put_transport(conn->conn_transport);
4254
4255         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4256         conn->conn_state = TARG_CONN_STATE_FREE;
4257         kfree(conn);
4258
4259         spin_lock_bh(&sess->conn_lock);
4260         atomic_dec(&sess->nconn);
4261         pr_debug("Decremented iSCSI connection count to %hu from node:"
4262                 " %s\n", atomic_read(&sess->nconn),
4263                 sess->sess_ops->InitiatorName);
4264         /*
4265          * Make sure that if one connection fails in an non ERL=2 iSCSI
4266          * Session that they all fail.
4267          */
4268         if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4269              !atomic_read(&sess->session_logout))
4270                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4271
4272         /*
4273          * If this was not the last connection in the session, and we are
4274          * performing session reinstatement or falling back to ERL=0, call
4275          * iscsit_stop_session() without sleeping to shutdown the other
4276          * active connections.
4277          */
4278         if (atomic_read(&sess->nconn)) {
4279                 if (!atomic_read(&sess->session_reinstatement) &&
4280                     !atomic_read(&sess->session_fall_back_to_erl0)) {
4281                         spin_unlock_bh(&sess->conn_lock);
4282                         return 0;
4283                 }
4284                 if (!atomic_read(&sess->session_stop_active)) {
4285                         atomic_set(&sess->session_stop_active, 1);
4286                         spin_unlock_bh(&sess->conn_lock);
4287                         iscsit_stop_session(sess, 0, 0);
4288                         return 0;
4289                 }
4290                 spin_unlock_bh(&sess->conn_lock);
4291                 return 0;
4292         }
4293
4294         /*
4295          * If this was the last connection in the session and one of the
4296          * following is occurring:
4297          *
4298          * Session Reinstatement is not being performed, and are falling back
4299          * to ERL=0 call iscsit_close_session().
4300          *
4301          * Session Logout was requested.  iscsit_close_session() will be called
4302          * elsewhere.
4303          *
4304          * Session Continuation is not being performed, start the Time2Retain
4305          * handler and check if sleep_on_sess_wait_sem is active.
4306          */
4307         if (!atomic_read(&sess->session_reinstatement) &&
4308              atomic_read(&sess->session_fall_back_to_erl0)) {
4309                 spin_unlock_bh(&sess->conn_lock);
4310                 iscsit_close_session(sess);
4311
4312                 return 0;
4313         } else if (atomic_read(&sess->session_logout)) {
4314                 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4315                 sess->session_state = TARG_SESS_STATE_FREE;
4316                 spin_unlock_bh(&sess->conn_lock);
4317
4318                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4319                         complete(&sess->session_wait_comp);
4320
4321                 return 0;
4322         } else {
4323                 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4324                 sess->session_state = TARG_SESS_STATE_FAILED;
4325
4326                 if (!atomic_read(&sess->session_continuation)) {
4327                         spin_unlock_bh(&sess->conn_lock);
4328                         iscsit_start_time2retain_handler(sess);
4329                 } else
4330                         spin_unlock_bh(&sess->conn_lock);
4331
4332                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4333                         complete(&sess->session_wait_comp);
4334
4335                 return 0;
4336         }
4337 }
4338
4339 /*
4340  * If the iSCSI Session for the iSCSI Initiator Node exists,
4341  * forcefully shutdown the iSCSI NEXUS.
4342  */
4343 int iscsit_close_session(struct iscsi_session *sess)
4344 {
4345         struct iscsi_portal_group *tpg = sess->tpg;
4346         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4347
4348         if (atomic_read(&sess->nconn)) {
4349                 pr_err("%d connection(s) still exist for iSCSI session"
4350                         " to %s\n", atomic_read(&sess->nconn),
4351                         sess->sess_ops->InitiatorName);
4352                 BUG();
4353         }
4354
4355         spin_lock_bh(&se_tpg->session_lock);
4356         atomic_set(&sess->session_logout, 1);
4357         atomic_set(&sess->session_reinstatement, 1);
4358         iscsit_stop_time2retain_timer(sess);
4359         spin_unlock_bh(&se_tpg->session_lock);
4360
4361         /*
4362          * transport_deregister_session_configfs() will clear the
4363          * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4364          * can be setting it again with __transport_register_session() in
4365          * iscsi_post_login_handler() again after the iscsit_stop_session()
4366          * completes in iscsi_np context.
4367          */
4368         transport_deregister_session_configfs(sess->se_sess);
4369
4370         /*
4371          * If any other processes are accessing this session pointer we must
4372          * wait until they have completed.  If we are in an interrupt (the
4373          * time2retain handler) and contain and active session usage count we
4374          * restart the timer and exit.
4375          */
4376         if (!in_interrupt()) {
4377                 if (iscsit_check_session_usage_count(sess) == 1)
4378                         iscsit_stop_session(sess, 1, 1);
4379         } else {
4380                 if (iscsit_check_session_usage_count(sess) == 2) {
4381                         atomic_set(&sess->session_logout, 0);
4382                         iscsit_start_time2retain_handler(sess);
4383                         return 0;
4384                 }
4385         }
4386
4387         transport_deregister_session(sess->se_sess);
4388
4389         if (sess->sess_ops->ErrorRecoveryLevel == 2)
4390                 iscsit_free_connection_recovery_entires(sess);
4391
4392         iscsit_free_all_ooo_cmdsns(sess);
4393
4394         spin_lock_bh(&se_tpg->session_lock);
4395         pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4396         sess->session_state = TARG_SESS_STATE_FREE;
4397         pr_debug("Released iSCSI session from node: %s\n",
4398                         sess->sess_ops->InitiatorName);
4399         tpg->nsessions--;
4400         if (tpg->tpg_tiqn)
4401                 tpg->tpg_tiqn->tiqn_nsessions--;
4402
4403         pr_debug("Decremented number of active iSCSI Sessions on"
4404                 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4405
4406         spin_lock(&sess_idr_lock);
4407         idr_remove(&sess_idr, sess->session_index);
4408         spin_unlock(&sess_idr_lock);
4409
4410         kfree(sess->sess_ops);
4411         sess->sess_ops = NULL;
4412         spin_unlock_bh(&se_tpg->session_lock);
4413
4414         kfree(sess);
4415         return 0;
4416 }
4417
4418 static void iscsit_logout_post_handler_closesession(
4419         struct iscsi_conn *conn)
4420 {
4421         struct iscsi_session *sess = conn->sess;
4422         int sleep = 1;
4423         /*
4424          * Traditional iscsi/tcp will invoke this logic from TX thread
4425          * context during session logout, so clear tx_thread_active and
4426          * sleep if iscsit_close_connection() has not already occured.
4427          *
4428          * Since iser-target invokes this logic from it's own workqueue,
4429          * always sleep waiting for RX/TX thread shutdown to complete
4430          * within iscsit_close_connection().
4431          */
4432         if (!conn->conn_transport->rdma_shutdown) {
4433                 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4434                 if (!sleep)
4435                         return;
4436         }
4437
4438         atomic_set(&conn->conn_logout_remove, 0);
4439         complete(&conn->conn_logout_comp);
4440
4441         iscsit_dec_conn_usage_count(conn);
4442         iscsit_stop_session(sess, sleep, sleep);
4443         iscsit_dec_session_usage_count(sess);
4444         iscsit_close_session(sess);
4445 }
4446
4447 static void iscsit_logout_post_handler_samecid(
4448         struct iscsi_conn *conn)
4449 {
4450         int sleep = 1;
4451
4452         if (!conn->conn_transport->rdma_shutdown) {
4453                 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4454                 if (!sleep)
4455                         return;
4456         }
4457
4458         atomic_set(&conn->conn_logout_remove, 0);
4459         complete(&conn->conn_logout_comp);
4460
4461         iscsit_cause_connection_reinstatement(conn, sleep);
4462         iscsit_dec_conn_usage_count(conn);
4463 }
4464
4465 static void iscsit_logout_post_handler_diffcid(
4466         struct iscsi_conn *conn,
4467         u16 cid)
4468 {
4469         struct iscsi_conn *l_conn;
4470         struct iscsi_session *sess = conn->sess;
4471         bool conn_found = false;
4472
4473         if (!sess)
4474                 return;
4475
4476         spin_lock_bh(&sess->conn_lock);
4477         list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4478                 if (l_conn->cid == cid) {
4479                         iscsit_inc_conn_usage_count(l_conn);
4480                         conn_found = true;
4481                         break;
4482                 }
4483         }
4484         spin_unlock_bh(&sess->conn_lock);
4485
4486         if (!conn_found)
4487                 return;
4488
4489         if (l_conn->sock)
4490                 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4491
4492         spin_lock_bh(&l_conn->state_lock);
4493         pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4494         l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4495         spin_unlock_bh(&l_conn->state_lock);
4496
4497         iscsit_cause_connection_reinstatement(l_conn, 1);
4498         iscsit_dec_conn_usage_count(l_conn);
4499 }
4500
4501 /*
4502  *      Return of 0 causes the TX thread to restart.
4503  */
4504 int iscsit_logout_post_handler(
4505         struct iscsi_cmd *cmd,
4506         struct iscsi_conn *conn)
4507 {
4508         int ret = 0;
4509
4510         switch (cmd->logout_reason) {
4511         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4512                 switch (cmd->logout_response) {
4513                 case ISCSI_LOGOUT_SUCCESS:
4514                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4515                 default:
4516                         iscsit_logout_post_handler_closesession(conn);
4517                         break;
4518                 }
4519                 ret = 0;
4520                 break;
4521         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4522                 if (conn->cid == cmd->logout_cid) {
4523                         switch (cmd->logout_response) {
4524                         case ISCSI_LOGOUT_SUCCESS:
4525                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4526                         default:
4527                                 iscsit_logout_post_handler_samecid(conn);
4528                                 break;
4529                         }
4530                         ret = 0;
4531                 } else {
4532                         switch (cmd->logout_response) {
4533                         case ISCSI_LOGOUT_SUCCESS:
4534                                 iscsit_logout_post_handler_diffcid(conn,
4535                                         cmd->logout_cid);
4536                                 break;
4537                         case ISCSI_LOGOUT_CID_NOT_FOUND:
4538                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4539                         default:
4540                                 break;
4541                         }
4542                         ret = 1;
4543                 }
4544                 break;
4545         case ISCSI_LOGOUT_REASON_RECOVERY:
4546                 switch (cmd->logout_response) {
4547                 case ISCSI_LOGOUT_SUCCESS:
4548                 case ISCSI_LOGOUT_CID_NOT_FOUND:
4549                 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4550                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4551                 default:
4552                         break;
4553                 }
4554                 ret = 1;
4555                 break;
4556         default:
4557                 break;
4558
4559         }
4560         return ret;
4561 }
4562 EXPORT_SYMBOL(iscsit_logout_post_handler);
4563
4564 void iscsit_fail_session(struct iscsi_session *sess)
4565 {
4566         struct iscsi_conn *conn;
4567
4568         spin_lock_bh(&sess->conn_lock);
4569         list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4570                 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4571                 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4572         }
4573         spin_unlock_bh(&sess->conn_lock);
4574
4575         pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4576         sess->session_state = TARG_SESS_STATE_FAILED;
4577 }
4578
4579 int iscsit_free_session(struct iscsi_session *sess)
4580 {
4581         u16 conn_count = atomic_read(&sess->nconn);
4582         struct iscsi_conn *conn, *conn_tmp = NULL;
4583         int is_last;
4584
4585         spin_lock_bh(&sess->conn_lock);
4586         atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4587
4588         list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4589                         conn_list) {
4590                 if (conn_count == 0)
4591                         break;
4592
4593                 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4594                         is_last = 1;
4595                 } else {
4596                         iscsit_inc_conn_usage_count(conn_tmp);
4597                         is_last = 0;
4598                 }
4599                 iscsit_inc_conn_usage_count(conn);
4600
4601                 spin_unlock_bh(&sess->conn_lock);
4602                 iscsit_cause_connection_reinstatement(conn, 1);
4603                 spin_lock_bh(&sess->conn_lock);
4604
4605                 iscsit_dec_conn_usage_count(conn);
4606                 if (is_last == 0)
4607                         iscsit_dec_conn_usage_count(conn_tmp);
4608
4609                 conn_count--;
4610         }
4611
4612         if (atomic_read(&sess->nconn)) {
4613                 spin_unlock_bh(&sess->conn_lock);
4614                 wait_for_completion(&sess->session_wait_comp);
4615         } else
4616                 spin_unlock_bh(&sess->conn_lock);
4617
4618         iscsit_close_session(sess);
4619         return 0;
4620 }
4621
4622 void iscsit_stop_session(
4623         struct iscsi_session *sess,
4624         int session_sleep,
4625         int connection_sleep)
4626 {
4627         u16 conn_count = atomic_read(&sess->nconn);
4628         struct iscsi_conn *conn, *conn_tmp = NULL;
4629         int is_last;
4630
4631         spin_lock_bh(&sess->conn_lock);
4632         if (session_sleep)
4633                 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4634
4635         if (connection_sleep) {
4636                 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4637                                 conn_list) {
4638                         if (conn_count == 0)
4639                                 break;
4640
4641                         if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4642                                 is_last = 1;
4643                         } else {
4644                                 iscsit_inc_conn_usage_count(conn_tmp);
4645                                 is_last = 0;
4646                         }
4647                         iscsit_inc_conn_usage_count(conn);
4648
4649                         spin_unlock_bh(&sess->conn_lock);
4650                         iscsit_cause_connection_reinstatement(conn, 1);
4651                         spin_lock_bh(&sess->conn_lock);
4652
4653                         iscsit_dec_conn_usage_count(conn);
4654                         if (is_last == 0)
4655                                 iscsit_dec_conn_usage_count(conn_tmp);
4656                         conn_count--;
4657                 }
4658         } else {
4659                 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4660                         iscsit_cause_connection_reinstatement(conn, 0);
4661         }
4662
4663         if (session_sleep && atomic_read(&sess->nconn)) {
4664                 spin_unlock_bh(&sess->conn_lock);
4665                 wait_for_completion(&sess->session_wait_comp);
4666         } else
4667                 spin_unlock_bh(&sess->conn_lock);
4668 }
4669
4670 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4671 {
4672         struct iscsi_session *sess;
4673         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4674         struct se_session *se_sess, *se_sess_tmp;
4675         LIST_HEAD(free_list);
4676         int session_count = 0;
4677
4678         spin_lock_bh(&se_tpg->session_lock);
4679         if (tpg->nsessions && !force) {
4680                 spin_unlock_bh(&se_tpg->session_lock);
4681                 return -1;
4682         }
4683
4684         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4685                         sess_list) {
4686                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4687
4688                 spin_lock(&sess->conn_lock);
4689                 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4690                     atomic_read(&sess->session_logout) ||
4691                     (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4692                         spin_unlock(&sess->conn_lock);
4693                         continue;
4694                 }
4695                 atomic_set(&sess->session_reinstatement, 1);
4696                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4697                 spin_unlock(&sess->conn_lock);
4698
4699                 list_move_tail(&se_sess->sess_list, &free_list);
4700         }
4701         spin_unlock_bh(&se_tpg->session_lock);
4702
4703         list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
4704                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4705
4706                 iscsit_free_session(sess);
4707                 session_count++;
4708         }
4709
4710         pr_debug("Released %d iSCSI Session(s) from Target Portal"
4711                         " Group: %hu\n", session_count, tpg->tpgt);
4712         return 0;
4713 }
4714
4715 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4716 MODULE_VERSION("4.1.x");
4717 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4718 MODULE_LICENSE("GPL");
4719
4720 module_init(iscsi_target_init_module);
4721 module_exit(iscsi_target_cleanup_module);