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(struct iscsi_tiqn), GFP_KERNEL);
 132         if (!tiqn) {
 133                 pr_err("Unable to allocate struct iscsi_tiqn\n");
 134                 return ERR_PTR(-ENOMEM);
 135         }
 136
 137         sprintf(tiqn->tiqn, "%s", buf);
 138         INIT_LIST_HEAD(&tiqn->tiqn_list);
 139         INIT_LIST_HEAD(&tiqn->tiqn_tpg_list);
 140         spin_lock_init(&tiqn->tiqn_state_lock);
 141         spin_lock_init(&tiqn->tiqn_tpg_lock);
 142         spin_lock_init(&tiqn->sess_err_stats.lock);
 143         spin_lock_init(&tiqn->login_stats.lock);
 144         spin_lock_init(&tiqn->logout_stats.lock);
 145
 146         tiqn->tiqn_state = TIQN_STATE_ACTIVE;
 147
 148         idr_preload(GFP_KERNEL);
 149         spin_lock(&tiqn_lock);
 150
 151         ret = idr_alloc(&tiqn_idr, NULL, 0, 0, GFP_NOWAIT);
 152         if (ret < 0) {
 153                 pr_err("idr_alloc() failed for tiqn->tiqn_index\n");
 154                 spin_unlock(&tiqn_lock);
 155                 idr_preload_end();
 156                 kfree(tiqn);
 157                 return ERR_PTR(ret);
 158         }
 159         tiqn->tiqn_index = ret;
 160         list_add_tail(&tiqn->tiqn_list, &g_tiqn_list);
 161
 162         spin_unlock(&tiqn_lock);
 163         idr_preload_end();
 164
 165         pr_debug("CORE[0] - Added iSCSI Target IQN: %s\n", tiqn->tiqn);
 166
 167         return tiqn;
 168
 169 }
 170
 171 static void iscsit_wait_for_tiqn(struct iscsi_tiqn *tiqn)
 172 {
 173         /*
 174          * Wait for accesses to said struct iscsi_tiqn to end.
 175          */
 176         spin_lock(&tiqn->tiqn_state_lock);
 177         while (tiqn->tiqn_access_count != 0) {
 178                 spin_unlock(&tiqn->tiqn_state_lock);
 179                 msleep(10);
 180                 spin_lock(&tiqn->tiqn_state_lock);
 181         }
 182         spin_unlock(&tiqn->tiqn_state_lock);
 183 }
 184
 185 void iscsit_del_tiqn(struct iscsi_tiqn *tiqn)
 186 {
 187         /*
 188          * iscsit_set_tiqn_shutdown sets tiqn->tiqn_state = TIQN_STATE_SHUTDOWN
 189          * while holding tiqn->tiqn_state_lock.  This means that all subsequent
 190          * attempts to access this struct iscsi_tiqn will fail from both transport
 191          * fabric and control code paths.
 192          */
 193         if (iscsit_set_tiqn_shutdown(tiqn) < 0) {
 194                 pr_err("iscsit_set_tiqn_shutdown() failed\n");
 195                 return;
 196         }
 197
 198         iscsit_wait_for_tiqn(tiqn);
 199
 200         spin_lock(&tiqn_lock);
 201         list_del(&tiqn->tiqn_list);
 202         idr_remove(&tiqn_idr, tiqn->tiqn_index);
 203         spin_unlock(&tiqn_lock);
 204
 205         pr_debug("CORE[0] - Deleted iSCSI Target IQN: %s\n",
 206                         tiqn->tiqn);
 207         kfree(tiqn);
 208 }
 209
 210 int iscsit_access_np(struct iscsi_np *np, struct iscsi_portal_group *tpg)
 211 {
 212         int ret;
 213         /*
 214          * Determine if the network portal is accepting storage traffic.
 215          */
 216         spin_lock_bh(&np->np_thread_lock);
 217         if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 218                 spin_unlock_bh(&np->np_thread_lock);
 219                 return -1;
 220         }
 221         spin_unlock_bh(&np->np_thread_lock);
 222         /*
 223          * Determine if the portal group is accepting storage traffic.
 224          */
 225         spin_lock_bh(&tpg->tpg_state_lock);
 226         if (tpg->tpg_state != TPG_STATE_ACTIVE) {
 227                 spin_unlock_bh(&tpg->tpg_state_lock);
 228                 return -1;
 229         }
 230         spin_unlock_bh(&tpg->tpg_state_lock);
 231
 232         /*
 233          * Here we serialize access across the TIQN+TPG Tuple.
 234          */
 235         ret = down_interruptible(&tpg->np_login_sem);
 236         if (ret != 0)
 237                 return -1;
 238
 239         spin_lock_bh(&tpg->tpg_state_lock);
 240         if (tpg->tpg_state != TPG_STATE_ACTIVE) {
 241                 spin_unlock_bh(&tpg->tpg_state_lock);
 242                 up(&tpg->np_login_sem);
 243                 return -1;
 244         }
 245         spin_unlock_bh(&tpg->tpg_state_lock);
 246
 247         return 0;
 248 }
 249
 250 void iscsit_login_kref_put(struct kref *kref)
 251 {
 252         struct iscsi_tpg_np *tpg_np = container_of(kref,
 253                                 struct iscsi_tpg_np, tpg_np_kref);
 254
 255         complete(&tpg_np->tpg_np_comp);
 256 }
 257
 258 int iscsit_deaccess_np(struct iscsi_np *np, struct iscsi_portal_group *tpg,
 259                        struct iscsi_tpg_np *tpg_np)
 260 {
 261         struct iscsi_tiqn *tiqn = tpg->tpg_tiqn;
 262
 263         up(&tpg->np_login_sem);
 264
 265         if (tpg_np)
 266                 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
 267
 268         if (tiqn)
 269                 iscsit_put_tiqn_for_login(tiqn);
 270
 271         return 0;
 272 }
 273
 274 bool iscsit_check_np_match(
 275         struct sockaddr_storage *sockaddr,
 276         struct iscsi_np *np,
 277         int network_transport)
 278 {
 279         struct sockaddr_in *sock_in, *sock_in_e;
 280         struct sockaddr_in6 *sock_in6, *sock_in6_e;
 281         bool ip_match = false;
 282         u16 port, port_e;
 283
 284         if (sockaddr->ss_family == AF_INET6) {
 285                 sock_in6 = (struct sockaddr_in6 *)sockaddr;
 286                 sock_in6_e = (struct sockaddr_in6 *)&np->np_sockaddr;
 287
 288                 if (!memcmp(&sock_in6->sin6_addr.in6_u,
 289                             &sock_in6_e->sin6_addr.in6_u,
 290                             sizeof(struct in6_addr)))
 291                         ip_match = true;
 292
 293                 port = ntohs(sock_in6->sin6_port);
 294                 port_e = ntohs(sock_in6_e->sin6_port);
 295         } else {
 296                 sock_in = (struct sockaddr_in *)sockaddr;
 297                 sock_in_e = (struct sockaddr_in *)&np->np_sockaddr;
 298
 299                 if (sock_in->sin_addr.s_addr == sock_in_e->sin_addr.s_addr)
 300                         ip_match = true;
 301
 302                 port = ntohs(sock_in->sin_port);
 303                 port_e = ntohs(sock_in_e->sin_port);
 304         }
 305
 306         if (ip_match && (port_e == port) &&
 307             (np->np_network_transport == network_transport))
 308                 return true;
 309
 310         return false;
 311 }
 312
 313 /*
 314  * Called with mutex np_lock held
 315  */
 316 static struct iscsi_np *iscsit_get_np(
 317         struct sockaddr_storage *sockaddr,
 318         int network_transport)
 319 {
 320         struct iscsi_np *np;
 321         bool match;
 322
 323         list_for_each_entry(np, &g_np_list, np_list) {
 324                 spin_lock_bh(&np->np_thread_lock);
 325                 if (np->np_thread_state != ISCSI_NP_THREAD_ACTIVE) {
 326                         spin_unlock_bh(&np->np_thread_lock);
 327                         continue;
 328                 }
 329
 330                 match = iscsit_check_np_match(sockaddr, np, network_transport);
 331                 if (match) {
 332                         /*
 333                          * Increment the np_exports reference count now to
 334                          * prevent iscsit_del_np() below from being called
 335                          * while iscsi_tpg_add_network_portal() is called.
 336                          */
 337                         np->np_exports++;
 338                         spin_unlock_bh(&np->np_thread_lock);
 339                         return np;
 340                 }
 341                 spin_unlock_bh(&np->np_thread_lock);
 342         }
 343
 344         return NULL;
 345 }
 346
 347 struct iscsi_np *iscsit_add_np(
 348         struct sockaddr_storage *sockaddr,
 349         int network_transport)
 350 {
 351         struct iscsi_np *np;
 352         int ret;
 353
 354         mutex_lock(&np_lock);
 355
 356         /*
 357          * Locate the existing struct iscsi_np if already active..
 358          */
 359         np = iscsit_get_np(sockaddr, network_transport);
 360         if (np) {
 361                 mutex_unlock(&np_lock);
 362                 return np;
 363         }
 364
 365         np = kzalloc(sizeof(struct iscsi_np), GFP_KERNEL);
 366         if (!np) {
 367                 pr_err("Unable to allocate memory for struct iscsi_np\n");
 368                 mutex_unlock(&np_lock);
 369                 return ERR_PTR(-ENOMEM);
 370         }
 371
 372         np->np_flags |= NPF_IP_NETWORK;
 373         np->np_network_transport = network_transport;
 374         spin_lock_init(&np->np_thread_lock);
 375         init_completion(&np->np_restart_comp);
 376         INIT_LIST_HEAD(&np->np_list);
 377
 378         ret = iscsi_target_setup_login_socket(np, sockaddr);
 379         if (ret != 0) {
 380                 kfree(np);
 381                 mutex_unlock(&np_lock);
 382                 return ERR_PTR(ret);
 383         }
 384
 385         np->np_thread = kthread_run(iscsi_target_login_thread, np, "iscsi_np");
 386         if (IS_ERR(np->np_thread)) {
 387                 pr_err("Unable to create kthread: iscsi_np\n");
 388                 ret = PTR_ERR(np->np_thread);
 389                 kfree(np);
 390                 mutex_unlock(&np_lock);
 391                 return ERR_PTR(ret);
 392         }
 393         /*
 394          * Increment the np_exports reference count now to prevent
 395          * iscsit_del_np() below from being run while a new call to
 396          * iscsi_tpg_add_network_portal() for a matching iscsi_np is
 397          * active.  We don't need to hold np->np_thread_lock at this
 398          * point because iscsi_np has not been added to g_np_list yet.
 399          */
 400         np->np_exports = 1;
 401         np->np_thread_state = ISCSI_NP_THREAD_ACTIVE;
 402
 403         list_add_tail(&np->np_list, &g_np_list);
 404         mutex_unlock(&np_lock);
 405
 406         pr_debug("CORE[0] - Added Network Portal: %pISpc on %s\n",
 407                 &np->np_sockaddr, np->np_transport->name);
 408
 409         return np;
 410 }
 411
 412 int iscsit_reset_np_thread(
 413         struct iscsi_np *np,
 414         struct iscsi_tpg_np *tpg_np,
 415         struct iscsi_portal_group *tpg,
 416         bool shutdown)
 417 {
 418         spin_lock_bh(&np->np_thread_lock);
 419         if (np->np_thread_state == ISCSI_NP_THREAD_INACTIVE) {
 420                 spin_unlock_bh(&np->np_thread_lock);
 421                 return 0;
 422         }
 423         np->np_thread_state = ISCSI_NP_THREAD_RESET;
 424
 425         if (np->np_thread) {
 426                 spin_unlock_bh(&np->np_thread_lock);
 427                 send_sig(SIGINT, np->np_thread, 1);
 428                 wait_for_completion(&np->np_restart_comp);
 429                 spin_lock_bh(&np->np_thread_lock);
 430         }
 431         spin_unlock_bh(&np->np_thread_lock);
 432
 433         if (tpg_np && shutdown) {
 434                 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
 435
 436                 wait_for_completion(&tpg_np->tpg_np_comp);
 437         }
 438
 439         return 0;
 440 }
 441
 442 static void iscsit_free_np(struct iscsi_np *np)
 443 {
 444         if (np->np_socket)
 445                 sock_release(np->np_socket);
 446 }
 447
 448 int iscsit_del_np(struct iscsi_np *np)
 449 {
 450         spin_lock_bh(&np->np_thread_lock);
 451         np->np_exports--;
 452         if (np->np_exports) {
 453                 np->enabled = true;
 454                 spin_unlock_bh(&np->np_thread_lock);
 455                 return 0;
 456         }
 457         np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
 458         spin_unlock_bh(&np->np_thread_lock);
 459
 460         if (np->np_thread) {
 461                 /*
 462                  * We need to send the signal to wakeup Linux/Net
 463                  * which may be sleeping in sock_accept()..
 464                  */
 465                 send_sig(SIGINT, np->np_thread, 1);
 466                 kthread_stop(np->np_thread);
 467                 np->np_thread = NULL;
 468         }
 469
 470         np->np_transport->iscsit_free_np(np);
 471
 472         mutex_lock(&np_lock);
 473         list_del(&np->np_list);
 474         mutex_unlock(&np_lock);
 475
 476         pr_debug("CORE[0] - Removed Network Portal: %pISpc on %s\n",
 477                 &np->np_sockaddr, np->np_transport->name);
 478
 479         iscsit_put_transport(np->np_transport);
 480         kfree(np);
 481         return 0;
 482 }
 483
 484 static void iscsit_get_rx_pdu(struct iscsi_conn *);
 485
 486 int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
 487 {
 488         return iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
 489 }
 490 EXPORT_SYMBOL(iscsit_queue_rsp);
 491
 492 void iscsit_aborted_task(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
 493 {
 494         bool scsi_cmd = (cmd->iscsi_opcode == ISCSI_OP_SCSI_CMD);
 495
 496         spin_lock_bh(&conn->cmd_lock);
 497         if (!list_empty(&cmd->i_conn_node) &&
 498             !(cmd->se_cmd.transport_state & CMD_T_FABRIC_STOP))
 499                 list_del_init(&cmd->i_conn_node);
 500         spin_unlock_bh(&conn->cmd_lock);
 501
 502         __iscsit_free_cmd(cmd, scsi_cmd, true);
 503 }
 504 EXPORT_SYMBOL(iscsit_aborted_task);
 505
 506 static void iscsit_do_crypto_hash_buf(struct ahash_request *, const void *,
 507                                       u32, u32, u8 *, u8 *);
 508 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *);
 509
 510 static int
 511 iscsit_xmit_nondatain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 512                           const void *data_buf, u32 data_buf_len)
 513 {
 514         struct iscsi_hdr *hdr = (struct iscsi_hdr *)cmd->pdu;
 515         struct kvec *iov;
 516         u32 niov = 0, tx_size = ISCSI_HDR_LEN;
 517         int ret;
 518
 519         iov = &cmd->iov_misc[0];
 520         iov[niov].iov_base      = cmd->pdu;
 521         iov[niov++].iov_len     = ISCSI_HDR_LEN;
 522
 523         if (conn->conn_ops->HeaderDigest) {
 524                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
 525
 526                 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, hdr,
 527                                           ISCSI_HDR_LEN, 0, NULL,
 528                                           (u8 *)header_digest);
 529
 530                 iov[0].iov_len += ISCSI_CRC_LEN;
 531                 tx_size += ISCSI_CRC_LEN;
 532                 pr_debug("Attaching CRC32C HeaderDigest"
 533                          " to opcode 0x%x 0x%08x\n",
 534                          hdr->opcode, *header_digest);
 535         }
 536
 537         if (data_buf_len) {
 538                 u32 padding = ((-data_buf_len) & 3);
 539
 540                 iov[niov].iov_base      = (void *)data_buf;
 541                 iov[niov++].iov_len     = data_buf_len;
 542                 tx_size += data_buf_len;
 543
 544                 if (padding != 0) {
 545                         iov[niov].iov_base = &cmd->pad_bytes;
 546                         iov[niov++].iov_len = padding;
 547                         tx_size += padding;
 548                         pr_debug("Attaching %u additional"
 549                                  " padding bytes.\n", padding);
 550                 }
 551
 552                 if (conn->conn_ops->DataDigest) {
 553                         iscsit_do_crypto_hash_buf(conn->conn_tx_hash,
 554                                                   data_buf, data_buf_len,
 555                                                   padding,
 556                                                   (u8 *)&cmd->pad_bytes,
 557                                                   (u8 *)&cmd->data_crc);
 558
 559                         iov[niov].iov_base = &cmd->data_crc;
 560                         iov[niov++].iov_len = ISCSI_CRC_LEN;
 561                         tx_size += ISCSI_CRC_LEN;
 562                         pr_debug("Attached DataDigest for %u"
 563                                  " bytes opcode 0x%x, CRC 0x%08x\n",
 564                                  data_buf_len, hdr->opcode, cmd->data_crc);
 565                 }
 566         }
 567
 568         cmd->iov_misc_count = niov;
 569         cmd->tx_size = tx_size;
 570
 571         ret = iscsit_send_tx_data(cmd, conn, 1);
 572         if (ret < 0) {
 573                 iscsit_tx_thread_wait_for_tcp(conn);
 574                 return ret;
 575         }
 576
 577         return 0;
 578 }
 579
 580 static int iscsit_map_iovec(struct iscsi_cmd *, struct kvec *, u32, u32);
 581 static void iscsit_unmap_iovec(struct iscsi_cmd *);
 582 static u32 iscsit_do_crypto_hash_sg(struct ahash_request *, struct iscsi_cmd *,
 583                                     u32, u32, u32, u8 *);
 584 static int
 585 iscsit_xmit_datain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 586                        const struct iscsi_datain *datain)
 587 {
 588         struct kvec *iov;
 589         u32 iov_count = 0, tx_size = 0;
 590         int ret, iov_ret;
 591
 592         iov = &cmd->iov_data[0];
 593         iov[iov_count].iov_base = cmd->pdu;
 594         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
 595         tx_size += ISCSI_HDR_LEN;
 596
 597         if (conn->conn_ops->HeaderDigest) {
 598                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
 599
 600                 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, cmd->pdu,
 601                                           ISCSI_HDR_LEN, 0, NULL,
 602                                           (u8 *)header_digest);
 603
 604                 iov[0].iov_len += ISCSI_CRC_LEN;
 605                 tx_size += ISCSI_CRC_LEN;
 606
 607                 pr_debug("Attaching CRC32 HeaderDigest for DataIN PDU 0x%08x\n",
 608                          *header_digest);
 609         }
 610
 611         iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
 612                                    datain->offset, datain->length);
 613         if (iov_ret < 0)
 614                 return -1;
 615
 616         iov_count += iov_ret;
 617         tx_size += datain->length;
 618
 619         cmd->padding = ((-datain->length) & 3);
 620         if (cmd->padding) {
 621                 iov[iov_count].iov_base         = cmd->pad_bytes;
 622                 iov[iov_count++].iov_len        = cmd->padding;
 623                 tx_size += cmd->padding;
 624
 625                 pr_debug("Attaching %u padding bytes\n", cmd->padding);
 626         }
 627
 628         if (conn->conn_ops->DataDigest) {
 629                 cmd->data_crc = iscsit_do_crypto_hash_sg(conn->conn_tx_hash,
 630                                                          cmd, datain->offset,
 631                                                          datain->length,
 632                                                          cmd->padding,
 633                                                          cmd->pad_bytes);
 634
 635                 iov[iov_count].iov_base = &cmd->data_crc;
 636                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
 637                 tx_size += ISCSI_CRC_LEN;
 638
 639                 pr_debug("Attached CRC32C DataDigest %d bytes, crc 0x%08x\n",
 640                          datain->length + cmd->padding, cmd->data_crc);
 641         }
 642
 643         cmd->iov_data_count = iov_count;
 644         cmd->tx_size = tx_size;
 645
 646         ret = iscsit_fe_sendpage_sg(cmd, conn);
 647
 648         iscsit_unmap_iovec(cmd);
 649
 650         if (ret < 0) {
 651                 iscsit_tx_thread_wait_for_tcp(conn);
 652                 return ret;
 653         }
 654
 655         return 0;
 656 }
 657
 658 static int iscsit_xmit_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 659                            struct iscsi_datain_req *dr, const void *buf,
 660                            u32 buf_len)
 661 {
 662         if (dr)
 663                 return iscsit_xmit_datain_pdu(conn, cmd, buf);
 664         else
 665                 return iscsit_xmit_nondatain_pdu(conn, cmd, buf, buf_len);
 666 }
 667
 668 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn)
 669 {
 670         return TARGET_PROT_NORMAL;
 671 }
 672
 673 static struct iscsit_transport iscsi_target_transport = {
 674         .name                   = "iSCSI/TCP",
 675         .transport_type         = ISCSI_TCP,
 676         .rdma_shutdown          = false,
 677         .owner                  = NULL,
 678         .iscsit_setup_np        = iscsit_setup_np,
 679         .iscsit_accept_np       = iscsit_accept_np,
 680         .iscsit_free_np         = iscsit_free_np,
 681         .iscsit_get_login_rx    = iscsit_get_login_rx,
 682         .iscsit_put_login_tx    = iscsit_put_login_tx,
 683         .iscsit_get_dataout     = iscsit_build_r2ts_for_cmd,
 684         .iscsit_immediate_queue = iscsit_immediate_queue,
 685         .iscsit_response_queue  = iscsit_response_queue,
 686         .iscsit_queue_data_in   = iscsit_queue_rsp,
 687         .iscsit_queue_status    = iscsit_queue_rsp,
 688         .iscsit_aborted_task    = iscsit_aborted_task,
 689         .iscsit_xmit_pdu        = iscsit_xmit_pdu,
 690         .iscsit_get_rx_pdu      = iscsit_get_rx_pdu,
 691         .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops,
 692 };
 693
 694 static int __init iscsi_target_init_module(void)
 695 {
 696         int ret = 0, size;
 697
 698         pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
 699
 700         iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
 701         if (!iscsit_global) {
 702                 pr_err("Unable to allocate memory for iscsit_global\n");
 703                 return -1;
 704         }
 705         spin_lock_init(&iscsit_global->ts_bitmap_lock);
 706         mutex_init(&auth_id_lock);
 707         spin_lock_init(&sess_idr_lock);
 708         idr_init(&tiqn_idr);
 709         idr_init(&sess_idr);
 710
 711         ret = target_register_template(&iscsi_ops);
 712         if (ret)
 713                 goto out;
 714
 715         size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long);
 716         iscsit_global->ts_bitmap = vzalloc(size);
 717         if (!iscsit_global->ts_bitmap) {
 718                 pr_err("Unable to allocate iscsit_global->ts_bitmap\n");
 719                 goto configfs_out;
 720         }
 721
 722         lio_qr_cache = kmem_cache_create("lio_qr_cache",
 723                         sizeof(struct iscsi_queue_req),
 724                         __alignof__(struct iscsi_queue_req), 0, NULL);
 725         if (!lio_qr_cache) {
 726                 pr_err("nable to kmem_cache_create() for"
 727                                 " lio_qr_cache\n");
 728                 goto bitmap_out;
 729         }
 730
 731         lio_dr_cache = kmem_cache_create("lio_dr_cache",
 732                         sizeof(struct iscsi_datain_req),
 733                         __alignof__(struct iscsi_datain_req), 0, NULL);
 734         if (!lio_dr_cache) {
 735                 pr_err("Unable to kmem_cache_create() for"
 736                                 " lio_dr_cache\n");
 737                 goto qr_out;
 738         }
 739
 740         lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
 741                         sizeof(struct iscsi_ooo_cmdsn),
 742                         __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
 743         if (!lio_ooo_cache) {
 744                 pr_err("Unable to kmem_cache_create() for"
 745                                 " lio_ooo_cache\n");
 746                 goto dr_out;
 747         }
 748
 749         lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
 750                         sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
 751                         0, NULL);
 752         if (!lio_r2t_cache) {
 753                 pr_err("Unable to kmem_cache_create() for"
 754                                 " lio_r2t_cache\n");
 755                 goto ooo_out;
 756         }
 757
 758         iscsit_register_transport(&iscsi_target_transport);
 759
 760         if (iscsit_load_discovery_tpg() < 0)
 761                 goto r2t_out;
 762
 763         return ret;
 764 r2t_out:
 765         iscsit_unregister_transport(&iscsi_target_transport);
 766         kmem_cache_destroy(lio_r2t_cache);
 767 ooo_out:
 768         kmem_cache_destroy(lio_ooo_cache);
 769 dr_out:
 770         kmem_cache_destroy(lio_dr_cache);
 771 qr_out:
 772         kmem_cache_destroy(lio_qr_cache);
 773 bitmap_out:
 774         vfree(iscsit_global->ts_bitmap);
 775 configfs_out:
 776         /* XXX: this probably wants it to be it's own unwind step.. */
 777         if (iscsit_global->discovery_tpg)
 778                 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
 779         target_unregister_template(&iscsi_ops);
 780 out:
 781         kfree(iscsit_global);
 782         return -ENOMEM;
 783 }
 784
 785 static void __exit iscsi_target_cleanup_module(void)
 786 {
 787         iscsit_release_discovery_tpg();
 788         iscsit_unregister_transport(&iscsi_target_transport);
 789         kmem_cache_destroy(lio_qr_cache);
 790         kmem_cache_destroy(lio_dr_cache);
 791         kmem_cache_destroy(lio_ooo_cache);
 792         kmem_cache_destroy(lio_r2t_cache);
 793
 794         /*
 795          * Shutdown discovery sessions and disable discovery TPG
 796          */
 797         if (iscsit_global->discovery_tpg)
 798                 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
 799
 800         target_unregister_template(&iscsi_ops);
 801
 802         vfree(iscsit_global->ts_bitmap);
 803         kfree(iscsit_global);
 804 }
 805
 806 int iscsit_add_reject(
 807         struct iscsi_conn *conn,
 808         u8 reason,
 809         unsigned char *buf)
 810 {
 811         struct iscsi_cmd *cmd;
 812
 813         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
 814         if (!cmd)
 815                 return -1;
 816
 817         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 818         cmd->reject_reason = reason;
 819
 820         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 821         if (!cmd->buf_ptr) {
 822                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 823                 iscsit_free_cmd(cmd, false);
 824                 return -1;
 825         }
 826
 827         spin_lock_bh(&conn->cmd_lock);
 828         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 829         spin_unlock_bh(&conn->cmd_lock);
 830
 831         cmd->i_state = ISTATE_SEND_REJECT;
 832         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 833
 834         return -1;
 835 }
 836 EXPORT_SYMBOL(iscsit_add_reject);
 837
 838 static int iscsit_add_reject_from_cmd(
 839         struct iscsi_cmd *cmd,
 840         u8 reason,
 841         bool add_to_conn,
 842         unsigned char *buf)
 843 {
 844         struct iscsi_conn *conn;
 845
 846         if (!cmd->conn) {
 847                 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
 848                                 cmd->init_task_tag);
 849                 return -1;
 850         }
 851         conn = cmd->conn;
 852
 853         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 854         cmd->reject_reason = reason;
 855
 856         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 857         if (!cmd->buf_ptr) {
 858                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 859                 iscsit_free_cmd(cmd, false);
 860                 return -1;
 861         }
 862
 863         if (add_to_conn) {
 864                 spin_lock_bh(&conn->cmd_lock);
 865                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 866                 spin_unlock_bh(&conn->cmd_lock);
 867         }
 868
 869         cmd->i_state = ISTATE_SEND_REJECT;
 870         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 871         /*
 872          * Perform the kref_put now if se_cmd has already been setup by
 873          * scsit_setup_scsi_cmd()
 874          */
 875         if (cmd->se_cmd.se_tfo != NULL) {
 876                 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
 877                 target_put_sess_cmd(&cmd->se_cmd);
 878         }
 879         return -1;
 880 }
 881
 882 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
 883                                  unsigned char *buf)
 884 {
 885         return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
 886 }
 887
 888 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
 889 {
 890         return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
 891 }
 892 EXPORT_SYMBOL(iscsit_reject_cmd);
 893
 894 /*
 895  * Map some portion of the allocated scatterlist to an iovec, suitable for
 896  * kernel sockets to copy data in/out.
 897  */
 898 static int iscsit_map_iovec(
 899         struct iscsi_cmd *cmd,
 900         struct kvec *iov,
 901         u32 data_offset,
 902         u32 data_length)
 903 {
 904         u32 i = 0;
 905         struct scatterlist *sg;
 906         unsigned int page_off;
 907
 908         /*
 909          * We know each entry in t_data_sg contains a page.
 910          */
 911         u32 ent = data_offset / PAGE_SIZE;
 912
 913         if (ent >= cmd->se_cmd.t_data_nents) {
 914                 pr_err("Initial page entry out-of-bounds\n");
 915                 return -1;
 916         }
 917
 918         sg = &cmd->se_cmd.t_data_sg[ent];
 919         page_off = (data_offset % PAGE_SIZE);
 920
 921         cmd->first_data_sg = sg;
 922         cmd->first_data_sg_off = page_off;
 923
 924         while (data_length) {
 925                 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
 926
 927                 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
 928                 iov[i].iov_len = cur_len;
 929
 930                 data_length -= cur_len;
 931                 page_off = 0;
 932                 sg = sg_next(sg);
 933                 i++;
 934         }
 935
 936         cmd->kmapped_nents = i;
 937
 938         return i;
 939 }
 940
 941 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
 942 {
 943         u32 i;
 944         struct scatterlist *sg;
 945
 946         sg = cmd->first_data_sg;
 947
 948         for (i = 0; i < cmd->kmapped_nents; i++)
 949                 kunmap(sg_page(&sg[i]));
 950 }
 951
 952 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
 953 {
 954         LIST_HEAD(ack_list);
 955         struct iscsi_cmd *cmd, *cmd_p;
 956
 957         conn->exp_statsn = exp_statsn;
 958
 959         if (conn->sess->sess_ops->RDMAExtensions)
 960                 return;
 961
 962         spin_lock_bh(&conn->cmd_lock);
 963         list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
 964                 spin_lock(&cmd->istate_lock);
 965                 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
 966                     iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
 967                         cmd->i_state = ISTATE_REMOVE;
 968                         spin_unlock(&cmd->istate_lock);
 969                         list_move_tail(&cmd->i_conn_node, &ack_list);
 970                         continue;
 971                 }
 972                 spin_unlock(&cmd->istate_lock);
 973         }
 974         spin_unlock_bh(&conn->cmd_lock);
 975
 976         list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
 977                 list_del_init(&cmd->i_conn_node);
 978                 iscsit_free_cmd(cmd, false);
 979         }
 980 }
 981
 982 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
 983 {
 984         u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
 985
 986         iov_count += ISCSI_IOV_DATA_BUFFER;
 987
 988         cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
 989         if (!cmd->iov_data) {
 990                 pr_err("Unable to allocate cmd->iov_data\n");
 991                 return -ENOMEM;
 992         }
 993
 994         cmd->orig_iov_data_count = iov_count;
 995         return 0;
 996 }
 997
 998 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 999                           unsigned char *buf)
1000 {
1001         int data_direction, payload_length;
1002         struct iscsi_scsi_req *hdr;
1003         int iscsi_task_attr;
1004         int sam_task_attr;
1005
1006         atomic_long_inc(&conn->sess->cmd_pdus);
1007
1008         hdr                     = (struct iscsi_scsi_req *) buf;
1009         payload_length          = ntoh24(hdr->dlength);
1010
1011         /* FIXME; Add checks for AdditionalHeaderSegment */
1012
1013         if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
1014             !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1015                 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
1016                                 " not set. Bad iSCSI Initiator.\n");
1017                 return iscsit_add_reject_cmd(cmd,
1018                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1019         }
1020
1021         if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
1022              (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
1023                 /*
1024                  * From RFC-3720 Section 10.3.1:
1025                  *
1026                  * "Either or both of R and W MAY be 1 when either the
1027                  *  Expected Data Transfer Length and/or Bidirectional Read
1028                  *  Expected Data Transfer Length are 0"
1029                  *
1030                  * For this case, go ahead and clear the unnecssary bits
1031                  * to avoid any confusion with ->data_direction.
1032                  */
1033                 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
1034                 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
1035
1036                 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
1037                         " set when Expected Data Transfer Length is 0 for"
1038                         " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
1039         }
1040
1041         if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
1042             !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
1043                 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
1044                         " MUST be set if Expected Data Transfer Length is not 0."
1045                         " Bad iSCSI Initiator\n");
1046                 return iscsit_add_reject_cmd(cmd,
1047                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1048         }
1049
1050         if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
1051             (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
1052                 pr_err("Bidirectional operations not supported!\n");
1053                 return iscsit_add_reject_cmd(cmd,
1054                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1055         }
1056
1057         if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1058                 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
1059                                 " Scsi Command PDU.\n");
1060                 return iscsit_add_reject_cmd(cmd,
1061                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1062         }
1063
1064         if (payload_length && !conn->sess->sess_ops->ImmediateData) {
1065                 pr_err("ImmediateData=No but DataSegmentLength=%u,"
1066                         " protocol error.\n", payload_length);
1067                 return iscsit_add_reject_cmd(cmd,
1068                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1069         }
1070
1071         if ((be32_to_cpu(hdr->data_length) == payload_length) &&
1072             (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
1073                 pr_err("Expected Data Transfer Length and Length of"
1074                         " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
1075                         " bit is not set protocol error\n");
1076                 return iscsit_add_reject_cmd(cmd,
1077                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1078         }
1079
1080         if (payload_length > be32_to_cpu(hdr->data_length)) {
1081                 pr_err("DataSegmentLength: %u is greater than"
1082                         " EDTL: %u, protocol error.\n", payload_length,
1083                                 hdr->data_length);
1084                 return iscsit_add_reject_cmd(cmd,
1085                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1086         }
1087
1088         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1089                 pr_err("DataSegmentLength: %u is greater than"
1090                         " MaxXmitDataSegmentLength: %u, protocol error.\n",
1091                         payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1092                 return iscsit_add_reject_cmd(cmd,
1093                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1094         }
1095
1096         if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
1097                 pr_err("DataSegmentLength: %u is greater than"
1098                         " FirstBurstLength: %u, protocol error.\n",
1099                         payload_length, conn->sess->sess_ops->FirstBurstLength);
1100                 return iscsit_add_reject_cmd(cmd,
1101                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1102         }
1103
1104         data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
1105                          (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
1106                           DMA_NONE;
1107
1108         cmd->data_direction = data_direction;
1109         iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
1110         /*
1111          * Figure out the SAM Task Attribute for the incoming SCSI CDB
1112          */
1113         if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
1114             (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
1115                 sam_task_attr = TCM_SIMPLE_TAG;
1116         else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
1117                 sam_task_attr = TCM_ORDERED_TAG;
1118         else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
1119                 sam_task_attr = TCM_HEAD_TAG;
1120         else if (iscsi_task_attr == ISCSI_ATTR_ACA)
1121                 sam_task_attr = TCM_ACA_TAG;
1122         else {
1123                 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
1124                         " TCM_SIMPLE_TAG\n", iscsi_task_attr);
1125                 sam_task_attr = TCM_SIMPLE_TAG;
1126         }
1127
1128         cmd->iscsi_opcode       = ISCSI_OP_SCSI_CMD;
1129         cmd->i_state            = ISTATE_NEW_CMD;
1130         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1131         cmd->immediate_data     = (payload_length) ? 1 : 0;
1132         cmd->unsolicited_data   = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
1133                                      (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
1134         if (cmd->unsolicited_data)
1135                 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
1136
1137         conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1138         if (hdr->flags & ISCSI_FLAG_CMD_READ)
1139                 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
1140         else
1141                 cmd->targ_xfer_tag = 0xFFFFFFFF;
1142         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1143         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1144         cmd->first_burst_len    = payload_length;
1145
1146         if (!conn->sess->sess_ops->RDMAExtensions &&
1147              cmd->data_direction == DMA_FROM_DEVICE) {
1148                 struct iscsi_datain_req *dr;
1149
1150                 dr = iscsit_allocate_datain_req();
1151                 if (!dr)
1152                         return iscsit_add_reject_cmd(cmd,
1153                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1154
1155                 iscsit_attach_datain_req(cmd, dr);
1156         }
1157
1158         /*
1159          * Initialize struct se_cmd descriptor from target_core_mod infrastructure
1160          */
1161         transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1162                         conn->sess->se_sess, be32_to_cpu(hdr->data_length),
1163                         cmd->data_direction, sam_task_attr,
1164                         cmd->sense_buffer + 2);
1165
1166         pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1167                 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
1168                 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1169                 conn->cid);
1170
1171         target_get_sess_cmd(&cmd->se_cmd, true);
1172
1173         cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
1174                                                      scsilun_to_int(&hdr->lun));
1175         if (cmd->sense_reason)
1176                 goto attach_cmd;
1177
1178         /* only used for printks or comparing with ->ref_task_tag */
1179         cmd->se_cmd.tag = (__force u32)cmd->init_task_tag;
1180         cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1181         if (cmd->sense_reason) {
1182                 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1183                         return iscsit_add_reject_cmd(cmd,
1184                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1185                 }
1186
1187                 goto attach_cmd;
1188         }
1189
1190         if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1191                 return iscsit_add_reject_cmd(cmd,
1192                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1193         }
1194
1195 attach_cmd:
1196         spin_lock_bh(&conn->cmd_lock);
1197         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1198         spin_unlock_bh(&conn->cmd_lock);
1199         /*
1200          * Check if we need to delay processing because of ALUA
1201          * Active/NonOptimized primary access state..
1202          */
1203         core_alua_check_nonop_delay(&cmd->se_cmd);
1204
1205         return 0;
1206 }
1207 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1208
1209 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1210 {
1211         iscsit_set_dataout_sequence_values(cmd);
1212
1213         spin_lock_bh(&cmd->dataout_timeout_lock);
1214         iscsit_start_dataout_timer(cmd, cmd->conn);
1215         spin_unlock_bh(&cmd->dataout_timeout_lock);
1216 }
1217 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1218
1219 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1220                             struct iscsi_scsi_req *hdr)
1221 {
1222         int cmdsn_ret = 0;
1223         /*
1224          * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1225          * the Immediate Bit is not set, and no Immediate
1226          * Data is attached.
1227          *
1228          * A PDU/CmdSN carrying Immediate Data can only
1229          * be processed after the DataCRC has passed.
1230          * If the DataCRC fails, the CmdSN MUST NOT
1231          * be acknowledged. (See below)
1232          */
1233         if (!cmd->immediate_data) {
1234                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1235                                         (unsigned char *)hdr, hdr->cmdsn);
1236                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1237                         return -1;
1238                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1239                         target_put_sess_cmd(&cmd->se_cmd);
1240                         return 0;
1241                 }
1242         }
1243
1244         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1245
1246         /*
1247          * If no Immediate Data is attached, it's OK to return now.
1248          */
1249         if (!cmd->immediate_data) {
1250                 if (!cmd->sense_reason && cmd->unsolicited_data)
1251                         iscsit_set_unsoliticed_dataout(cmd);
1252                 if (!cmd->sense_reason)
1253                         return 0;
1254
1255                 target_put_sess_cmd(&cmd->se_cmd);
1256                 return 0;
1257         }
1258
1259         /*
1260          * Early CHECK_CONDITIONs with ImmediateData never make it to command
1261          * execution.  These exceptions are processed in CmdSN order using
1262          * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1263          */
1264         if (cmd->sense_reason) {
1265                 if (cmd->reject_reason)
1266                         return 0;
1267
1268                 return 1;
1269         }
1270         /*
1271          * Call directly into transport_generic_new_cmd() to perform
1272          * the backend memory allocation.
1273          */
1274         cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1275         if (cmd->sense_reason)
1276                 return 1;
1277
1278         return 0;
1279 }
1280 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1281
1282 static int
1283 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1284                           bool dump_payload)
1285 {
1286         int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1287         /*
1288          * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1289          */
1290         if (dump_payload)
1291                 goto after_immediate_data;
1292
1293         immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1294                                         cmd->first_burst_len);
1295 after_immediate_data:
1296         if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1297                 /*
1298                  * A PDU/CmdSN carrying Immediate Data passed
1299                  * DataCRC, check against ExpCmdSN/MaxCmdSN if
1300                  * Immediate Bit is not set.
1301                  */
1302                 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1303                                         (unsigned char *)hdr, hdr->cmdsn);
1304                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1305                         return -1;
1306
1307                 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1308                         int rc;
1309
1310                         rc = iscsit_dump_data_payload(cmd->conn,
1311                                                       cmd->first_burst_len, 1);
1312                         target_put_sess_cmd(&cmd->se_cmd);
1313                         return rc;
1314                 } else if (cmd->unsolicited_data)
1315                         iscsit_set_unsoliticed_dataout(cmd);
1316
1317         } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1318                 /*
1319                  * Immediate Data failed DataCRC and ERL>=1,
1320                  * silently drop this PDU and let the initiator
1321                  * plug the CmdSN gap.
1322                  *
1323                  * FIXME: Send Unsolicited NOPIN with reserved
1324                  * TTT here to help the initiator figure out
1325                  * the missing CmdSN, although they should be
1326                  * intelligent enough to determine the missing
1327                  * CmdSN and issue a retry to plug the sequence.
1328                  */
1329                 cmd->i_state = ISTATE_REMOVE;
1330                 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1331         } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1332                 return -1;
1333
1334         return 0;
1335 }
1336
1337 static int
1338 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1339                            unsigned char *buf)
1340 {
1341         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1342         int rc, immed_data;
1343         bool dump_payload = false;
1344
1345         rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1346         if (rc < 0)
1347                 return 0;
1348         /*
1349          * Allocation iovecs needed for struct socket operations for
1350          * traditional iSCSI block I/O.
1351          */
1352         if (iscsit_allocate_iovecs(cmd) < 0) {
1353                 return iscsit_reject_cmd(cmd,
1354                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1355         }
1356         immed_data = cmd->immediate_data;
1357
1358         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1359         if (rc < 0)
1360                 return rc;
1361         else if (rc > 0)
1362                 dump_payload = true;
1363
1364         if (!immed_data)
1365                 return 0;
1366
1367         return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1368 }
1369
1370 static u32 iscsit_do_crypto_hash_sg(
1371         struct ahash_request *hash,
1372         struct iscsi_cmd *cmd,
1373         u32 data_offset,
1374         u32 data_length,
1375         u32 padding,
1376         u8 *pad_bytes)
1377 {
1378         u32 data_crc;
1379         struct scatterlist *sg;
1380         unsigned int page_off;
1381
1382         crypto_ahash_init(hash);
1383
1384         sg = cmd->first_data_sg;
1385         page_off = cmd->first_data_sg_off;
1386
1387         while (data_length) {
1388                 u32 cur_len = min_t(u32, data_length, (sg->length - page_off));
1389
1390                 ahash_request_set_crypt(hash, sg, NULL, cur_len);
1391                 crypto_ahash_update(hash);
1392
1393                 data_length -= cur_len;
1394                 page_off = 0;
1395                 /* iscsit_map_iovec has already checked for invalid sg pointers */
1396                 sg = sg_next(sg);
1397         }
1398
1399         if (padding) {
1400                 struct scatterlist pad_sg;
1401
1402                 sg_init_one(&pad_sg, pad_bytes, padding);
1403                 ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc,
1404                                         padding);
1405                 crypto_ahash_finup(hash);
1406         } else {
1407                 ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0);
1408                 crypto_ahash_final(hash);
1409         }
1410
1411         return data_crc;
1412 }
1413
1414 static void iscsit_do_crypto_hash_buf(
1415         struct ahash_request *hash,
1416         const void *buf,
1417         u32 payload_length,
1418         u32 padding,
1419         u8 *pad_bytes,
1420         u8 *data_crc)
1421 {
1422         struct scatterlist sg[2];
1423
1424         sg_init_table(sg, ARRAY_SIZE(sg));
1425         sg_set_buf(sg, buf, payload_length);
1426         sg_set_buf(sg + 1, pad_bytes, padding);
1427
1428         ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding);
1429
1430         crypto_ahash_digest(hash);
1431 }
1432
1433 int
1434 __iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1435                            struct iscsi_cmd *cmd, u32 payload_length,
1436                            bool *success)
1437 {
1438         struct iscsi_data *hdr = buf;
1439         struct se_cmd *se_cmd;
1440         int rc;
1441
1442         /* iSCSI write */
1443         atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1444
1445         pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1446                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1447                 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1448                 payload_length, conn->cid);
1449
1450         if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1451                 pr_err("Command ITT: 0x%08x received DataOUT after"
1452                         " last DataOUT received, dumping payload\n",
1453                         cmd->init_task_tag);
1454                 return iscsit_dump_data_payload(conn, payload_length, 1);
1455         }
1456
1457         if (cmd->data_direction != DMA_TO_DEVICE) {
1458                 pr_err("Command ITT: 0x%08x received DataOUT for a"
1459                         " NON-WRITE command.\n", cmd->init_task_tag);
1460                 return iscsit_dump_data_payload(conn, payload_length, 1);
1461         }
1462         se_cmd = &cmd->se_cmd;
1463         iscsit_mod_dataout_timer(cmd);
1464
1465         if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1466                 pr_err("DataOut Offset: %u, Length %u greater than"
1467                         " iSCSI Command EDTL %u, protocol error.\n",
1468                         hdr->offset, payload_length, cmd->se_cmd.data_length);
1469                 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1470         }
1471
1472         if (cmd->unsolicited_data) {
1473                 int dump_unsolicited_data = 0;
1474
1475                 if (conn->sess->sess_ops->InitialR2T) {
1476                         pr_err("Received unexpected unsolicited data"
1477                                 " while InitialR2T=Yes, protocol error.\n");
1478                         transport_send_check_condition_and_sense(&cmd->se_cmd,
1479                                         TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1480                         return -1;
1481                 }
1482                 /*
1483                  * Special case for dealing with Unsolicited DataOUT
1484                  * and Unsupported SAM WRITE Opcodes and SE resource allocation
1485                  * failures;
1486                  */
1487
1488                 /* Something's amiss if we're not in WRITE_PENDING state... */
1489                 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1490                 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1491                         dump_unsolicited_data = 1;
1492
1493                 if (dump_unsolicited_data) {
1494                         /*
1495                          * Check if a delayed TASK_ABORTED status needs to
1496                          * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1497                          * received with the unsolicited data out.
1498                          */
1499                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1500                                 iscsit_stop_dataout_timer(cmd);
1501
1502                         transport_check_aborted_status(se_cmd,
1503                                         (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1504                         return iscsit_dump_data_payload(conn, payload_length, 1);
1505                 }
1506         } else {
1507                 /*
1508                  * For the normal solicited data path:
1509                  *
1510                  * Check for a delayed TASK_ABORTED status and dump any
1511                  * incoming data out payload if one exists.  Also, when the
1512                  * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1513                  * data out sequence, we decrement outstanding_r2ts.  Once
1514                  * outstanding_r2ts reaches zero, go ahead and send the delayed
1515                  * TASK_ABORTED status.
1516                  */
1517                 if (se_cmd->transport_state & CMD_T_ABORTED) {
1518                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1519                                 if (--cmd->outstanding_r2ts < 1) {
1520                                         iscsit_stop_dataout_timer(cmd);
1521                                         transport_check_aborted_status(
1522                                                         se_cmd, 1);
1523                                 }
1524
1525                         return iscsit_dump_data_payload(conn, payload_length, 1);
1526                 }
1527         }
1528         /*
1529          * Perform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1530          * within-command recovery checks before receiving the payload.
1531          */
1532         rc = iscsit_check_pre_dataout(cmd, buf);
1533         if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1534                 return 0;
1535         else if (rc == DATAOUT_CANNOT_RECOVER)
1536                 return -1;
1537         *success = true;
1538         return 0;
1539 }
1540 EXPORT_SYMBOL(__iscsit_check_dataout_hdr);
1541
1542 int
1543 iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
1544                          struct iscsi_cmd **out_cmd)
1545 {
1546         struct iscsi_data *hdr = buf;
1547         struct iscsi_cmd *cmd;
1548         u32 payload_length = ntoh24(hdr->dlength);
1549         int rc;
1550         bool success = false;
1551
1552         if (!payload_length) {
1553                 pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n");
1554                 return 0;
1555         }
1556
1557         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1558                 pr_err_ratelimited("DataSegmentLength: %u is greater than"
1559                         " MaxXmitDataSegmentLength: %u\n", payload_length,
1560                         conn->conn_ops->MaxXmitDataSegmentLength);
1561                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf);
1562         }
1563
1564         cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, payload_length);
1565         if (!cmd)
1566                 return 0;
1567
1568         rc = __iscsit_check_dataout_hdr(conn, buf, cmd, payload_length, &success);
1569
1570         if (success)
1571                 *out_cmd = cmd;
1572
1573         return rc;
1574 }
1575 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1576
1577 static int
1578 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1579                    struct iscsi_data *hdr)
1580 {
1581         struct kvec *iov;
1582         u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1583         u32 payload_length = ntoh24(hdr->dlength);
1584         int iov_ret, data_crc_failed = 0;
1585
1586         rx_size += payload_length;
1587         iov = &cmd->iov_data[0];
1588
1589         iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1590                                    payload_length);
1591         if (iov_ret < 0)
1592                 return -1;
1593
1594         iov_count += iov_ret;
1595
1596         padding = ((-payload_length) & 3);
1597         if (padding != 0) {
1598                 iov[iov_count].iov_base = cmd->pad_bytes;
1599                 iov[iov_count++].iov_len = padding;
1600                 rx_size += padding;
1601                 pr_debug("Receiving %u padding bytes.\n", padding);
1602         }
1603
1604         if (conn->conn_ops->DataDigest) {
1605                 iov[iov_count].iov_base = &checksum;
1606                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1607                 rx_size += ISCSI_CRC_LEN;
1608         }
1609
1610         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1611
1612         iscsit_unmap_iovec(cmd);
1613
1614         if (rx_got != rx_size)
1615                 return -1;
1616
1617         if (conn->conn_ops->DataDigest) {
1618                 u32 data_crc;
1619
1620                 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
1621                                                     be32_to_cpu(hdr->offset),
1622                                                     payload_length, padding,
1623                                                     cmd->pad_bytes);
1624
1625                 if (checksum != data_crc) {
1626                         pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1627                                 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1628                                 " does not match computed 0x%08x\n",
1629                                 hdr->itt, hdr->offset, payload_length,
1630                                 hdr->datasn, checksum, data_crc);
1631                         data_crc_failed = 1;
1632                 } else {
1633                         pr_debug("Got CRC32C DataDigest 0x%08x for"
1634                                 " %u bytes of Data Out\n", checksum,
1635                                 payload_length);
1636                 }
1637         }
1638
1639         return data_crc_failed;
1640 }
1641
1642 int
1643 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1644                              bool data_crc_failed)
1645 {
1646         struct iscsi_conn *conn = cmd->conn;
1647         int rc, ooo_cmdsn;
1648         /*
1649          * Increment post receive data and CRC values or perform
1650          * within-command recovery.
1651          */
1652         rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1653         if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1654                 return 0;
1655         else if (rc == DATAOUT_SEND_R2T) {
1656                 iscsit_set_dataout_sequence_values(cmd);
1657                 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1658         } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1659                 /*
1660                  * Handle extra special case for out of order
1661                  * Unsolicited Data Out.
1662                  */
1663                 spin_lock_bh(&cmd->istate_lock);
1664                 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1665                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1666                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1667                 spin_unlock_bh(&cmd->istate_lock);
1668
1669                 iscsit_stop_dataout_timer(cmd);
1670                 if (ooo_cmdsn)
1671                         return 0;
1672                 target_execute_cmd(&cmd->se_cmd);
1673                 return 0;
1674         } else /* DATAOUT_CANNOT_RECOVER */
1675                 return -1;
1676
1677         return 0;
1678 }
1679 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1680
1681 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1682 {
1683         struct iscsi_cmd *cmd = NULL;
1684         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1685         int rc;
1686         bool data_crc_failed = false;
1687
1688         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1689         if (rc < 0)
1690                 return 0;
1691         else if (!cmd)
1692                 return 0;
1693
1694         rc = iscsit_get_dataout(conn, cmd, hdr);
1695         if (rc < 0)
1696                 return rc;
1697         else if (rc > 0)
1698                 data_crc_failed = true;
1699
1700         return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1701 }
1702
1703 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1704                          struct iscsi_nopout *hdr)
1705 {
1706         u32 payload_length = ntoh24(hdr->dlength);
1707
1708         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1709                 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1710                 if (!cmd)
1711                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1712                                                  (unsigned char *)hdr);
1713
1714                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1715                                          (unsigned char *)hdr);
1716         }
1717
1718         if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1719                 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1720                         " not set, protocol error.\n");
1721                 if (!cmd)
1722                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1723                                                  (unsigned char *)hdr);
1724
1725                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1726                                          (unsigned char *)hdr);
1727         }
1728
1729         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1730                 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1731                         " greater than MaxXmitDataSegmentLength: %u, protocol"
1732                         " error.\n", payload_length,
1733                         conn->conn_ops->MaxXmitDataSegmentLength);
1734                 if (!cmd)
1735                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1736                                                  (unsigned char *)hdr);
1737
1738                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1739                                          (unsigned char *)hdr);
1740         }
1741
1742         pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1743                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1744                 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1745                 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1746                 payload_length);
1747         /*
1748          * This is not a response to a Unsolicited NopIN, which means
1749          * it can either be a NOPOUT ping request (with a valid ITT),
1750          * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1751          * Either way, make sure we allocate an struct iscsi_cmd, as both
1752          * can contain ping data.
1753          */
1754         if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1755                 cmd->iscsi_opcode       = ISCSI_OP_NOOP_OUT;
1756                 cmd->i_state            = ISTATE_SEND_NOPIN;
1757                 cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1758                                                 1 : 0);
1759                 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1760                 cmd->targ_xfer_tag      = 0xFFFFFFFF;
1761                 cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1762                 cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1763                 cmd->data_direction     = DMA_NONE;
1764         }
1765
1766         return 0;
1767 }
1768 EXPORT_SYMBOL(iscsit_setup_nop_out);
1769
1770 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1771                            struct iscsi_nopout *hdr)
1772 {
1773         struct iscsi_cmd *cmd_p = NULL;
1774         int cmdsn_ret = 0;
1775         /*
1776          * Initiator is expecting a NopIN ping reply..
1777          */
1778         if (hdr->itt != RESERVED_ITT) {
1779                 if (!cmd)
1780                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1781                                                 (unsigned char *)hdr);
1782
1783                 spin_lock_bh(&conn->cmd_lock);
1784                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1785                 spin_unlock_bh(&conn->cmd_lock);
1786
1787                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1788
1789                 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1790                         iscsit_add_cmd_to_response_queue(cmd, conn,
1791                                                          cmd->i_state);
1792                         return 0;
1793                 }
1794
1795                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1796                                 (unsigned char *)hdr, hdr->cmdsn);
1797                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1798                         return 0;
1799                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1800                         return -1;
1801
1802                 return 0;
1803         }
1804         /*
1805          * This was a response to a unsolicited NOPIN ping.
1806          */
1807         if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1808                 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1809                 if (!cmd_p)
1810                         return -EINVAL;
1811
1812                 iscsit_stop_nopin_response_timer(conn);
1813
1814                 cmd_p->i_state = ISTATE_REMOVE;
1815                 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1816
1817                 iscsit_start_nopin_timer(conn);
1818                 return 0;
1819         }
1820         /*
1821          * Otherwise, initiator is not expecting a NOPIN is response.
1822          * Just ignore for now.
1823          */
1824
1825         if (cmd)
1826                 iscsit_free_cmd(cmd, false);
1827
1828         return 0;
1829 }
1830 EXPORT_SYMBOL(iscsit_process_nop_out);
1831
1832 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1833                                  unsigned char *buf)
1834 {
1835         unsigned char *ping_data = NULL;
1836         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1837         struct kvec *iov = NULL;
1838         u32 payload_length = ntoh24(hdr->dlength);
1839         int ret;
1840
1841         ret = iscsit_setup_nop_out(conn, cmd, hdr);
1842         if (ret < 0)
1843                 return 0;
1844         /*
1845          * Handle NOP-OUT payload for traditional iSCSI sockets
1846          */
1847         if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1848                 u32 checksum, data_crc, padding = 0;
1849                 int niov = 0, rx_got, rx_size = payload_length;
1850
1851                 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1852                 if (!ping_data) {
1853                         pr_err("Unable to allocate memory for"
1854                                 " NOPOUT ping data.\n");
1855                         ret = -1;
1856                         goto out;
1857                 }
1858
1859                 iov = &cmd->iov_misc[0];
1860                 iov[niov].iov_base      = ping_data;
1861                 iov[niov++].iov_len     = payload_length;
1862
1863                 padding = ((-payload_length) & 3);
1864                 if (padding != 0) {
1865                         pr_debug("Receiving %u additional bytes"
1866                                 " for padding.\n", padding);
1867                         iov[niov].iov_base      = &cmd->pad_bytes;
1868                         iov[niov++].iov_len     = padding;
1869                         rx_size += padding;
1870                 }
1871                 if (conn->conn_ops->DataDigest) {
1872                         iov[niov].iov_base      = &checksum;
1873                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
1874                         rx_size += ISCSI_CRC_LEN;
1875                 }
1876
1877                 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1878                 if (rx_got != rx_size) {
1879                         ret = -1;
1880                         goto out;
1881                 }
1882
1883                 if (conn->conn_ops->DataDigest) {
1884                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
1885                                         ping_data, payload_length,
1886                                         padding, cmd->pad_bytes,
1887                                         (u8 *)&data_crc);
1888
1889                         if (checksum != data_crc) {
1890                                 pr_err("Ping data CRC32C DataDigest"
1891                                 " 0x%08x does not match computed 0x%08x\n",
1892                                         checksum, data_crc);
1893                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1894                                         pr_err("Unable to recover from"
1895                                         " NOPOUT Ping DataCRC failure while in"
1896                                                 " ERL=0.\n");
1897                                         ret = -1;
1898                                         goto out;
1899                                 } else {
1900                                         /*
1901                                          * Silently drop this PDU and let the
1902                                          * initiator plug the CmdSN gap.
1903                                          */
1904                                         pr_debug("Dropping NOPOUT"
1905                                         " Command CmdSN: 0x%08x due to"
1906                                         " DataCRC error.\n", hdr->cmdsn);
1907                                         ret = 0;
1908                                         goto out;
1909                                 }
1910                         } else {
1911                                 pr_debug("Got CRC32C DataDigest"
1912                                 " 0x%08x for %u bytes of ping data.\n",
1913                                         checksum, payload_length);
1914                         }
1915                 }
1916
1917                 ping_data[payload_length] = '\0';
1918                 /*
1919                  * Attach ping data to struct iscsi_cmd->buf_ptr.
1920                  */
1921                 cmd->buf_ptr = ping_data;
1922                 cmd->buf_ptr_size = payload_length;
1923
1924                 pr_debug("Got %u bytes of NOPOUT ping"
1925                         " data.\n", payload_length);
1926                 pr_debug("Ping Data: \"%s\"\n", ping_data);
1927         }
1928
1929         return iscsit_process_nop_out(conn, cmd, hdr);
1930 out:
1931         if (cmd)
1932                 iscsit_free_cmd(cmd, false);
1933
1934         kfree(ping_data);
1935         return ret;
1936 }
1937
1938 static enum tcm_tmreq_table iscsit_convert_tmf(u8 iscsi_tmf)
1939 {
1940         switch (iscsi_tmf) {
1941         case ISCSI_TM_FUNC_ABORT_TASK:
1942                 return TMR_ABORT_TASK;
1943         case ISCSI_TM_FUNC_ABORT_TASK_SET:
1944                 return TMR_ABORT_TASK_SET;
1945         case ISCSI_TM_FUNC_CLEAR_ACA:
1946                 return TMR_CLEAR_ACA;
1947         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
1948                 return TMR_CLEAR_TASK_SET;
1949         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
1950                 return TMR_LUN_RESET;
1951         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
1952                 return TMR_TARGET_WARM_RESET;
1953         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
1954                 return TMR_TARGET_COLD_RESET;
1955         default:
1956                 return TMR_UNKNOWN;
1957         }
1958 }
1959
1960 int
1961 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1962                            unsigned char *buf)
1963 {
1964         struct se_tmr_req *se_tmr;
1965         struct iscsi_tmr_req *tmr_req;
1966         struct iscsi_tm *hdr;
1967         int out_of_order_cmdsn = 0, ret;
1968         bool sess_ref = false;
1969         u8 function, tcm_function = TMR_UNKNOWN;
1970
1971         hdr                     = (struct iscsi_tm *) buf;
1972         hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1973         function = hdr->flags;
1974
1975         pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1976                 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1977                 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1978                 hdr->rtt, hdr->refcmdsn, conn->cid);
1979
1980         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1981             ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1982              hdr->rtt != RESERVED_ITT)) {
1983                 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1984                 hdr->rtt = RESERVED_ITT;
1985         }
1986
1987         if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1988                         !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1989                 pr_err("Task Management Request TASK_REASSIGN not"
1990                         " issued as immediate command, bad iSCSI Initiator"
1991                                 "implementation\n");
1992                 return iscsit_add_reject_cmd(cmd,
1993                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1994         }
1995         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1996             be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1997                 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1998
1999         cmd->data_direction = DMA_NONE;
2000
2001         cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
2002         if (!cmd->tmr_req) {
2003                 pr_err("Unable to allocate memory for"
2004                         " Task Management command!\n");
2005                 return iscsit_add_reject_cmd(cmd,
2006                                              ISCSI_REASON_BOOKMARK_NO_RESOURCES,
2007                                              buf);
2008         }
2009
2010         /*
2011          * TASK_REASSIGN for ERL=2 / connection stays inside of
2012          * LIO-Target $FABRIC_MOD
2013          */
2014         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2015                 transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
2016                                       conn->sess->se_sess, 0, DMA_NONE,
2017                                       TCM_SIMPLE_TAG, cmd->sense_buffer + 2);
2018
2019                 target_get_sess_cmd(&cmd->se_cmd, true);
2020                 sess_ref = true;
2021                 tcm_function = iscsit_convert_tmf(function);
2022                 if (tcm_function == TMR_UNKNOWN) {
2023                         pr_err("Unknown iSCSI TMR Function:"
2024                                " 0x%02x\n", function);
2025                         return iscsit_add_reject_cmd(cmd,
2026                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2027                 }
2028         }
2029         ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function,
2030                                  GFP_KERNEL);
2031         if (ret < 0)
2032                 return iscsit_add_reject_cmd(cmd,
2033                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2034
2035         cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
2036
2037         cmd->iscsi_opcode       = ISCSI_OP_SCSI_TMFUNC;
2038         cmd->i_state            = ISTATE_SEND_TASKMGTRSP;
2039         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2040         cmd->init_task_tag      = hdr->itt;
2041         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2042         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2043         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2044         se_tmr                  = cmd->se_cmd.se_tmr_req;
2045         tmr_req                 = cmd->tmr_req;
2046         /*
2047          * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
2048          */
2049         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2050                 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
2051                                                scsilun_to_int(&hdr->lun));
2052                 if (ret < 0) {
2053                         se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
2054                         goto attach;
2055                 }
2056         }
2057
2058         switch (function) {
2059         case ISCSI_TM_FUNC_ABORT_TASK:
2060                 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
2061                 if (se_tmr->response)
2062                         goto attach;
2063                 break;
2064         case ISCSI_TM_FUNC_ABORT_TASK_SET:
2065         case ISCSI_TM_FUNC_CLEAR_ACA:
2066         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
2067         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
2068                 break;
2069         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2070                 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
2071                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2072                         goto attach;
2073                 }
2074                 break;
2075         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2076                 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
2077                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2078                         goto attach;
2079                 }
2080                 break;
2081         case ISCSI_TM_FUNC_TASK_REASSIGN:
2082                 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
2083                 /*
2084                  * Perform sanity checks on the ExpDataSN only if the
2085                  * TASK_REASSIGN was successful.
2086                  */
2087                 if (se_tmr->response)
2088                         break;
2089
2090                 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
2091                         return iscsit_add_reject_cmd(cmd,
2092                                         ISCSI_REASON_BOOKMARK_INVALID, buf);
2093                 break;
2094         default:
2095                 pr_err("Unknown TMR function: 0x%02x, protocol"
2096                         " error.\n", function);
2097                 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
2098                 goto attach;
2099         }
2100
2101         if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
2102             (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
2103                 se_tmr->call_transport = 1;
2104 attach:
2105         spin_lock_bh(&conn->cmd_lock);
2106         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2107         spin_unlock_bh(&conn->cmd_lock);
2108
2109         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2110                 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2111                 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP)
2112                         out_of_order_cmdsn = 1;
2113                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2114                         return 0;
2115                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2116                         return -1;
2117         }
2118         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2119
2120         if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
2121                 return 0;
2122         /*
2123          * Found the referenced task, send to transport for processing.
2124          */
2125         if (se_tmr->call_transport)
2126                 return transport_generic_handle_tmr(&cmd->se_cmd);
2127
2128         /*
2129          * Could not find the referenced LUN, task, or Task Management
2130          * command not authorized or supported.  Change state and
2131          * let the tx_thread send the response.
2132          *
2133          * For connection recovery, this is also the default action for
2134          * TMR TASK_REASSIGN.
2135          */
2136         if (sess_ref) {
2137                 pr_debug("Handle TMR, using sess_ref=true check\n");
2138                 target_put_sess_cmd(&cmd->se_cmd);
2139         }
2140
2141         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2142         return 0;
2143 }
2144 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
2145
2146 /* #warning FIXME: Support Text Command parameters besides SendTargets */
2147 int
2148 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2149                       struct iscsi_text *hdr)
2150 {
2151         u32 payload_length = ntoh24(hdr->dlength);
2152
2153         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
2154                 pr_err("Unable to accept text parameter length: %u"
2155                         "greater than MaxXmitDataSegmentLength %u.\n",
2156                        payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
2157                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2158                                          (unsigned char *)hdr);
2159         }
2160
2161         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
2162              (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
2163                 pr_err("Multi sequence text commands currently not supported\n");
2164                 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
2165                                         (unsigned char *)hdr);
2166         }
2167
2168         pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
2169                 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
2170                 hdr->exp_statsn, payload_length);
2171
2172         cmd->iscsi_opcode       = ISCSI_OP_TEXT;
2173         cmd->i_state            = ISTATE_SEND_TEXTRSP;
2174         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2175         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2176         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2177         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2178         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2179         cmd->data_direction     = DMA_NONE;
2180         cmd->text_in_ptr        = NULL;
2181
2182         return 0;
2183 }
2184 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2185
2186 int
2187 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2188                         struct iscsi_text *hdr)
2189 {
2190         unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2191         int cmdsn_ret;
2192
2193         if (!text_in) {
2194                 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2195                 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2196                         pr_err("Unable to locate text_in buffer for sendtargets"
2197                                " discovery\n");
2198                         goto reject;
2199                 }
2200                 goto empty_sendtargets;
2201         }
2202         if (strncmp("SendTargets", text_in, 11) != 0) {
2203                 pr_err("Received Text Data that is not"
2204                         " SendTargets, cannot continue.\n");
2205                 goto reject;
2206         }
2207         text_ptr = strchr(text_in, '=');
2208         if (!text_ptr) {
2209                 pr_err("No \"=\" separator found in Text Data,"
2210                         "  cannot continue.\n");
2211                 goto reject;
2212         }
2213         if (!strncmp("=All", text_ptr, 4)) {
2214                 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2215         } else if (!strncmp("=iqn.", text_ptr, 5) ||
2216                    !strncmp("=eui.", text_ptr, 5)) {
2217                 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2218         } else {
2219                 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2220                 goto reject;
2221         }
2222
2223         spin_lock_bh(&conn->cmd_lock);
2224         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2225         spin_unlock_bh(&conn->cmd_lock);
2226
2227 empty_sendtargets:
2228         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2229
2230         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2231                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2232                                 (unsigned char *)hdr, hdr->cmdsn);
2233                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2234                         return -1;
2235
2236                 return 0;
2237         }
2238
2239         return iscsit_execute_cmd(cmd, 0);
2240
2241 reject:
2242         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2243                                  (unsigned char *)hdr);
2244 }
2245 EXPORT_SYMBOL(iscsit_process_text_cmd);
2246
2247 static int
2248 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2249                        unsigned char *buf)
2250 {
2251         struct iscsi_text *hdr = (struct iscsi_text *)buf;
2252         char *text_in = NULL;
2253         u32 payload_length = ntoh24(hdr->dlength);
2254         int rx_size, rc;
2255
2256         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2257         if (rc < 0)
2258                 return 0;
2259
2260         rx_size = payload_length;
2261         if (payload_length) {
2262                 u32 checksum = 0, data_crc = 0;
2263                 u32 padding = 0, pad_bytes = 0;
2264                 int niov = 0, rx_got;
2265                 struct kvec iov[3];
2266
2267                 text_in = kzalloc(payload_length, GFP_KERNEL);
2268                 if (!text_in) {
2269                         pr_err("Unable to allocate memory for"
2270                                 " incoming text parameters\n");
2271                         goto reject;
2272                 }
2273                 cmd->text_in_ptr = text_in;
2274
2275                 memset(iov, 0, 3 * sizeof(struct kvec));
2276                 iov[niov].iov_base      = text_in;
2277                 iov[niov++].iov_len     = payload_length;
2278
2279                 padding = ((-payload_length) & 3);
2280                 if (padding != 0) {
2281                         iov[niov].iov_base = &pad_bytes;
2282                         iov[niov++].iov_len  = padding;
2283                         rx_size += padding;
2284                         pr_debug("Receiving %u additional bytes"
2285                                         " for padding.\n", padding);
2286                 }
2287                 if (conn->conn_ops->DataDigest) {
2288                         iov[niov].iov_base      = &checksum;
2289                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
2290                         rx_size += ISCSI_CRC_LEN;
2291                 }
2292
2293                 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2294                 if (rx_got != rx_size)
2295                         goto reject;
2296
2297                 if (conn->conn_ops->DataDigest) {
2298                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
2299                                         text_in, payload_length,
2300                                         padding, (u8 *)&pad_bytes,
2301                                         (u8 *)&data_crc);
2302
2303                         if (checksum != data_crc) {
2304                                 pr_err("Text data CRC32C DataDigest"
2305                                         " 0x%08x does not match computed"
2306                                         " 0x%08x\n", checksum, data_crc);
2307                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2308                                         pr_err("Unable to recover from"
2309                                         " Text Data digest failure while in"
2310                                                 " ERL=0.\n");
2311                                         goto reject;
2312                                 } else {
2313                                         /*
2314                                          * Silently drop this PDU and let the
2315                                          * initiator plug the CmdSN gap.
2316                                          */
2317                                         pr_debug("Dropping Text"
2318                                         " Command CmdSN: 0x%08x due to"
2319                                         " DataCRC error.\n", hdr->cmdsn);
2320                                         kfree(text_in);
2321                                         return 0;
2322                                 }
2323                         } else {
2324                                 pr_debug("Got CRC32C DataDigest"
2325                                         " 0x%08x for %u bytes of text data.\n",
2326                                                 checksum, payload_length);
2327                         }
2328                 }
2329                 text_in[payload_length - 1] = '\0';
2330                 pr_debug("Successfully read %d bytes of text"
2331                                 " data.\n", payload_length);
2332         }
2333
2334         return iscsit_process_text_cmd(conn, cmd, hdr);
2335
2336 reject:
2337         kfree(cmd->text_in_ptr);
2338         cmd->text_in_ptr = NULL;
2339         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2340 }
2341
2342 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2343 {
2344         struct iscsi_conn *conn_p;
2345         struct iscsi_session *sess = conn->sess;
2346
2347         pr_debug("Received logout request CLOSESESSION on CID: %hu"
2348                 " for SID: %u.\n", conn->cid, conn->sess->sid);
2349
2350         atomic_set(&sess->session_logout, 1);
2351         atomic_set(&conn->conn_logout_remove, 1);
2352         conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2353
2354         iscsit_inc_conn_usage_count(conn);
2355         iscsit_inc_session_usage_count(sess);
2356
2357         spin_lock_bh(&sess->conn_lock);
2358         list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2359                 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2360                         continue;
2361
2362                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2363                 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2364         }
2365         spin_unlock_bh(&sess->conn_lock);
2366
2367         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2368
2369         return 0;
2370 }
2371
2372 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2373 {
2374         struct iscsi_conn *l_conn;
2375         struct iscsi_session *sess = conn->sess;
2376
2377         pr_debug("Received logout request CLOSECONNECTION for CID:"
2378                 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2379
2380         /*
2381          * A Logout Request with a CLOSECONNECTION reason code for a CID
2382          * can arrive on a connection with a differing CID.
2383          */
2384         if (conn->cid == cmd->logout_cid) {
2385                 spin_lock_bh(&conn->state_lock);
2386                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2387                 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2388
2389                 atomic_set(&conn->conn_logout_remove, 1);
2390                 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2391                 iscsit_inc_conn_usage_count(conn);
2392
2393                 spin_unlock_bh(&conn->state_lock);
2394         } else {
2395                 /*
2396                  * Handle all different cid CLOSECONNECTION requests in
2397                  * iscsit_logout_post_handler_diffcid() as to give enough
2398                  * time for any non immediate command's CmdSN to be
2399                  * acknowledged on the connection in question.
2400                  *
2401                  * Here we simply make sure the CID is still around.
2402                  */
2403                 l_conn = iscsit_get_conn_from_cid(sess,
2404                                 cmd->logout_cid);
2405                 if (!l_conn) {
2406                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2407                         iscsit_add_cmd_to_response_queue(cmd, conn,
2408                                         cmd->i_state);
2409                         return 0;
2410                 }
2411
2412                 iscsit_dec_conn_usage_count(l_conn);
2413         }
2414
2415         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2416
2417         return 0;
2418 }
2419
2420 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2421 {
2422         struct iscsi_session *sess = conn->sess;
2423
2424         pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2425                 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2426
2427         if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2428                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2429                         " while ERL!=2.\n");
2430                 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2431                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2432                 return 0;
2433         }
2434
2435         if (conn->cid == cmd->logout_cid) {
2436                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2437                         " with CID: %hu on CID: %hu, implementation error.\n",
2438                                 cmd->logout_cid, conn->cid);
2439                 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2440                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2441                 return 0;
2442         }
2443
2444         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2445
2446         return 0;
2447 }
2448
2449 int
2450 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2451                         unsigned char *buf)
2452 {
2453         int cmdsn_ret, logout_remove = 0;
2454         u8 reason_code = 0;
2455         struct iscsi_logout *hdr;
2456         struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2457
2458         hdr                     = (struct iscsi_logout *) buf;
2459         reason_code             = (hdr->flags & 0x7f);
2460
2461         if (tiqn) {
2462                 spin_lock(&tiqn->logout_stats.lock);
2463                 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2464                         tiqn->logout_stats.normal_logouts++;
2465                 else
2466                         tiqn->logout_stats.abnormal_logouts++;
2467                 spin_unlock(&tiqn->logout_stats.lock);
2468         }
2469
2470         pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2471                 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2472                 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2473                 hdr->cid, conn->cid);
2474
2475         if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2476                 pr_err("Received logout request on connection that"
2477                         " is not in logged in state, ignoring request.\n");
2478                 iscsit_free_cmd(cmd, false);
2479                 return 0;
2480         }
2481
2482         cmd->iscsi_opcode       = ISCSI_OP_LOGOUT;
2483         cmd->i_state            = ISTATE_SEND_LOGOUTRSP;
2484         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2485         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2486         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2487         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2488         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2489         cmd->logout_cid         = be16_to_cpu(hdr->cid);
2490         cmd->logout_reason      = reason_code;
2491         cmd->data_direction     = DMA_NONE;
2492
2493         /*
2494          * We need to sleep in these cases (by returning 1) until the Logout
2495          * Response gets sent in the tx thread.
2496          */
2497         if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2498            ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2499             be16_to_cpu(hdr->cid) == conn->cid))
2500                 logout_remove = 1;
2501
2502         spin_lock_bh(&conn->cmd_lock);
2503         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2504         spin_unlock_bh(&conn->cmd_lock);
2505
2506         if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2507                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2508
2509         /*
2510          * Immediate commands are executed, well, immediately.
2511          * Non-Immediate Logout Commands are executed in CmdSN order.
2512          */
2513         if (cmd->immediate_cmd) {
2514                 int ret = iscsit_execute_cmd(cmd, 0);
2515
2516                 if (ret < 0)
2517                         return ret;
2518         } else {
2519                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2520                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2521                         logout_remove = 0;
2522                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2523                         return -1;
2524         }
2525
2526         return logout_remove;
2527 }
2528 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2529
2530 int iscsit_handle_snack(
2531         struct iscsi_conn *conn,
2532         unsigned char *buf)
2533 {
2534         struct iscsi_snack *hdr;
2535
2536         hdr                     = (struct iscsi_snack *) buf;
2537         hdr->flags              &= ~ISCSI_FLAG_CMD_FINAL;
2538
2539         pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2540                 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2541                 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2542                         hdr->begrun, hdr->runlength, conn->cid);
2543
2544         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2545                 pr_err("Initiator sent SNACK request while in"
2546                         " ErrorRecoveryLevel=0.\n");
2547                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2548                                          buf);
2549         }
2550         /*
2551          * SNACK_DATA and SNACK_R2T are both 0,  so check which function to
2552          * call from inside iscsi_send_recovery_datain_or_r2t().
2553          */
2554         switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2555         case 0:
2556                 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2557                         hdr->itt,
2558                         be32_to_cpu(hdr->ttt),
2559                         be32_to_cpu(hdr->begrun),
2560                         be32_to_cpu(hdr->runlength));
2561         case ISCSI_FLAG_SNACK_TYPE_STATUS:
2562                 return iscsit_handle_status_snack(conn, hdr->itt,
2563                         be32_to_cpu(hdr->ttt),
2564                         be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2565         case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2566                 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2567                         be32_to_cpu(hdr->begrun),
2568                         be32_to_cpu(hdr->runlength));
2569         case ISCSI_FLAG_SNACK_TYPE_RDATA:
2570                 /* FIXME: Support R-Data SNACK */
2571                 pr_err("R-Data SNACK Not Supported.\n");
2572                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2573                                          buf);
2574         default:
2575                 pr_err("Unknown SNACK type 0x%02x, protocol"
2576                         " error.\n", hdr->flags & 0x0f);
2577                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2578                                          buf);
2579         }
2580
2581         return 0;
2582 }
2583 EXPORT_SYMBOL(iscsit_handle_snack);
2584
2585 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2586 {
2587         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2588             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2589                 wait_for_completion_interruptible_timeout(
2590                                         &conn->rx_half_close_comp,
2591                                         ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2592         }
2593 }
2594
2595 static int iscsit_handle_immediate_data(
2596         struct iscsi_cmd *cmd,
2597         struct iscsi_scsi_req *hdr,
2598         u32 length)
2599 {
2600         int iov_ret, rx_got = 0, rx_size = 0;
2601         u32 checksum, iov_count = 0, padding = 0;
2602         struct iscsi_conn *conn = cmd->conn;
2603         struct kvec *iov;
2604
2605         iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2606         if (iov_ret < 0)
2607                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2608
2609         rx_size = length;
2610         iov_count = iov_ret;
2611         iov = &cmd->iov_data[0];
2612
2613         padding = ((-length) & 3);
2614         if (padding != 0) {
2615                 iov[iov_count].iov_base = cmd->pad_bytes;
2616                 iov[iov_count++].iov_len = padding;
2617                 rx_size += padding;
2618         }
2619
2620         if (conn->conn_ops->DataDigest) {
2621                 iov[iov_count].iov_base         = &checksum;
2622                 iov[iov_count++].iov_len        = ISCSI_CRC_LEN;
2623                 rx_size += ISCSI_CRC_LEN;
2624         }
2625
2626         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2627
2628         iscsit_unmap_iovec(cmd);
2629
2630         if (rx_got != rx_size) {
2631                 iscsit_rx_thread_wait_for_tcp(conn);
2632                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2633         }
2634
2635         if (conn->conn_ops->DataDigest) {
2636                 u32 data_crc;
2637
2638                 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
2639                                                     cmd->write_data_done, length, padding,
2640                                                     cmd->pad_bytes);
2641
2642                 if (checksum != data_crc) {
2643                         pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2644                                 " does not match computed 0x%08x\n", checksum,
2645                                 data_crc);
2646
2647                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2648                                 pr_err("Unable to recover from"
2649                                         " Immediate Data digest failure while"
2650                                         " in ERL=0.\n");
2651                                 iscsit_reject_cmd(cmd,
2652                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2653                                                 (unsigned char *)hdr);
2654                                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2655                         } else {
2656                                 iscsit_reject_cmd(cmd,
2657                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2658                                                 (unsigned char *)hdr);
2659                                 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2660                         }
2661                 } else {
2662                         pr_debug("Got CRC32C DataDigest 0x%08x for"
2663                                 " %u bytes of Immediate Data\n", checksum,
2664                                 length);
2665                 }
2666         }
2667
2668         cmd->write_data_done += length;
2669
2670         if (cmd->write_data_done == cmd->se_cmd.data_length) {
2671                 spin_lock_bh(&cmd->istate_lock);
2672                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2673                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2674                 spin_unlock_bh(&cmd->istate_lock);
2675         }
2676
2677         return IMMEDIATE_DATA_NORMAL_OPERATION;
2678 }
2679
2680 /*
2681  *      Called with sess->conn_lock held.
2682  */
2683 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2684         with active network interface */
2685 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2686 {
2687         struct iscsi_cmd *cmd;
2688         struct iscsi_conn *conn_p;
2689         bool found = false;
2690
2691         /*
2692          * Only send a Asynchronous Message on connections whos network
2693          * interface is still functional.
2694          */
2695         list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2696                 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2697                         iscsit_inc_conn_usage_count(conn_p);
2698                         found = true;
2699                         break;
2700                 }
2701         }
2702
2703         if (!found)
2704                 return;
2705
2706         cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2707         if (!cmd) {
2708                 iscsit_dec_conn_usage_count(conn_p);
2709                 return;
2710         }
2711
2712         cmd->logout_cid = conn->cid;
2713         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2714         cmd->i_state = ISTATE_SEND_ASYNCMSG;
2715
2716         spin_lock_bh(&conn_p->cmd_lock);
2717         list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2718         spin_unlock_bh(&conn_p->cmd_lock);
2719
2720         iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2721         iscsit_dec_conn_usage_count(conn_p);
2722 }
2723
2724 static int iscsit_send_conn_drop_async_message(
2725         struct iscsi_cmd *cmd,
2726         struct iscsi_conn *conn)
2727 {
2728         struct iscsi_async *hdr;
2729
2730         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2731
2732         hdr                     = (struct iscsi_async *) cmd->pdu;
2733         hdr->opcode             = ISCSI_OP_ASYNC_EVENT;
2734         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
2735         cmd->init_task_tag      = RESERVED_ITT;
2736         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2737         put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2738         cmd->stat_sn            = conn->stat_sn++;
2739         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2740         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2741         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2742         hdr->async_event        = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2743         hdr->param1             = cpu_to_be16(cmd->logout_cid);
2744         hdr->param2             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2745         hdr->param3             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2746
2747         pr_debug("Sending Connection Dropped Async Message StatSN:"
2748                 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2749                         cmd->logout_cid, conn->cid);
2750
2751         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2752 }
2753
2754 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2755 {
2756         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2757             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2758                 wait_for_completion_interruptible_timeout(
2759                                         &conn->tx_half_close_comp,
2760                                         ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2761         }
2762 }
2763
2764 void
2765 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2766                         struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2767                         bool set_statsn)
2768 {
2769         hdr->opcode             = ISCSI_OP_SCSI_DATA_IN;
2770         hdr->flags              = datain->flags;
2771         if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2772                 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2773                         hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2774                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2775                 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2776                         hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2777                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2778                 }
2779         }
2780         hton24(hdr->dlength, datain->length);
2781         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2782                 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2783                                 (struct scsi_lun *)&hdr->lun);
2784         else
2785                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2786
2787         hdr->itt                = cmd->init_task_tag;
2788
2789         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2790                 hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2791         else
2792                 hdr->ttt                = cpu_to_be32(0xFFFFFFFF);
2793         if (set_statsn)
2794                 hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2795         else
2796                 hdr->statsn             = cpu_to_be32(0xFFFFFFFF);
2797
2798         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2799         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2800         hdr->datasn             = cpu_to_be32(datain->data_sn);
2801         hdr->offset             = cpu_to_be32(datain->offset);
2802
2803         pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2804                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2805                 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2806                 ntohl(hdr->offset), datain->length, conn->cid);
2807 }
2808 EXPORT_SYMBOL(iscsit_build_datain_pdu);
2809
2810 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2811 {
2812         struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2813         struct iscsi_datain datain;
2814         struct iscsi_datain_req *dr;
2815         int eodr = 0, ret;
2816         bool set_statsn = false;
2817
2818         memset(&datain, 0, sizeof(struct iscsi_datain));
2819         dr = iscsit_get_datain_values(cmd, &datain);
2820         if (!dr) {
2821                 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2822                                 cmd->init_task_tag);
2823                 return -1;
2824         }
2825         /*
2826          * Be paranoid and double check the logic for now.
2827          */
2828         if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2829                 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2830                         " datain.length: %u exceeds cmd->data_length: %u\n",
2831                         cmd->init_task_tag, datain.offset, datain.length,
2832                         cmd->se_cmd.data_length);
2833                 return -1;
2834         }
2835
2836         atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2837         /*
2838          * Special case for successfully execution w/ both DATAIN
2839          * and Sense Data.
2840          */
2841         if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2842             (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2843                 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2844         else {
2845                 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2846                     (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2847                         iscsit_increment_maxcmdsn(cmd, conn->sess);
2848                         cmd->stat_sn = conn->stat_sn++;
2849                         set_statsn = true;
2850                 } else if (dr->dr_complete ==
2851                            DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2852                         set_statsn = true;
2853         }
2854
2855         iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2856
2857         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0);
2858         if (ret < 0)
2859                 return ret;
2860
2861         if (dr->dr_complete) {
2862                 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2863                                 2 : 1;
2864                 iscsit_free_datain_req(cmd, dr);
2865         }
2866
2867         return eodr;
2868 }
2869
2870 int
2871 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2872                         struct iscsi_logout_rsp *hdr)
2873 {
2874         struct iscsi_conn *logout_conn = NULL;
2875         struct iscsi_conn_recovery *cr = NULL;
2876         struct iscsi_session *sess = conn->sess;
2877         /*
2878          * The actual shutting down of Sessions and/or Connections
2879          * for CLOSESESSION and CLOSECONNECTION Logout Requests
2880          * is done in scsi_logout_post_handler().
2881          */
2882         switch (cmd->logout_reason) {
2883         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2884                 pr_debug("iSCSI session logout successful, setting"
2885                         " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2886                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2887                 break;
2888         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2889                 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2890                         break;
2891                 /*
2892                  * For CLOSECONNECTION logout requests carrying
2893                  * a matching logout CID -> local CID, the reference
2894                  * for the local CID will have been incremented in
2895                  * iscsi_logout_closeconnection().
2896                  *
2897                  * For CLOSECONNECTION logout requests carrying
2898                  * a different CID than the connection it arrived
2899                  * on, the connection responding to cmd->logout_cid
2900                  * is stopped in iscsit_logout_post_handler_diffcid().
2901                  */
2902
2903                 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2904                         " successful.\n", cmd->logout_cid, conn->cid);
2905                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2906                 break;
2907         case ISCSI_LOGOUT_REASON_RECOVERY:
2908                 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2909                     (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2910                         break;
2911                 /*
2912                  * If the connection is still active from our point of view
2913                  * force connection recovery to occur.
2914                  */
2915                 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2916                                 cmd->logout_cid);
2917                 if (logout_conn) {
2918                         iscsit_connection_reinstatement_rcfr(logout_conn);
2919                         iscsit_dec_conn_usage_count(logout_conn);
2920                 }
2921
2922                 cr = iscsit_get_inactive_connection_recovery_entry(
2923                                 conn->sess, cmd->logout_cid);
2924                 if (!cr) {
2925                         pr_err("Unable to locate CID: %hu for"
2926                         " REMOVECONNFORRECOVERY Logout Request.\n",
2927                                 cmd->logout_cid);
2928                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2929                         break;
2930                 }
2931
2932                 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2933
2934                 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2935                         " for recovery for CID: %hu on CID: %hu successful.\n",
2936                                 cmd->logout_cid, conn->cid);
2937                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2938                 break;
2939         default:
2940                 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2941                                 cmd->logout_reason);
2942                 return -1;
2943         }
2944
2945         hdr->opcode             = ISCSI_OP_LOGOUT_RSP;
2946         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2947         hdr->response           = cmd->logout_response;
2948         hdr->itt                = cmd->init_task_tag;
2949         cmd->stat_sn            = conn->stat_sn++;
2950         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2951
2952         iscsit_increment_maxcmdsn(cmd, conn->sess);
2953         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2954         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2955
2956         pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2957                 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2958                 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2959                 cmd->logout_cid, conn->cid);
2960
2961         return 0;
2962 }
2963 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2964
2965 static int
2966 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2967 {
2968         int rc;
2969
2970         rc = iscsit_build_logout_rsp(cmd, conn,
2971                         (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2972         if (rc < 0)
2973                 return rc;
2974
2975         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2976 }
2977
2978 void
2979 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2980                        struct iscsi_nopin *hdr, bool nopout_response)
2981 {
2982         hdr->opcode             = ISCSI_OP_NOOP_IN;
2983         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2984         hton24(hdr->dlength, cmd->buf_ptr_size);
2985         if (nopout_response)
2986                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2987         hdr->itt                = cmd->init_task_tag;
2988         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2989         cmd->stat_sn            = (nopout_response) ? conn->stat_sn++ :
2990                                   conn->stat_sn;
2991         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2992
2993         if (nopout_response)
2994                 iscsit_increment_maxcmdsn(cmd, conn->sess);
2995
2996         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2997         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2998
2999         pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
3000                 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
3001                 "Solicited" : "Unsolicited", cmd->init_task_tag,
3002                 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
3003 }
3004 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
3005
3006 /*
3007  *      Unsolicited NOPIN, either requesting a response or not.
3008  */
3009 static int iscsit_send_unsolicited_nopin(
3010         struct iscsi_cmd *cmd,
3011         struct iscsi_conn *conn,
3012         int want_response)
3013 {
3014         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3015         int ret;
3016
3017         iscsit_build_nopin_rsp(cmd, conn, hdr, false);
3018
3019         pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
3020                 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
3021
3022         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3023         if (ret < 0)
3024                 return ret;
3025
3026         spin_lock_bh(&cmd->istate_lock);
3027         cmd->i_state = want_response ?
3028                 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
3029         spin_unlock_bh(&cmd->istate_lock);
3030
3031         return 0;
3032 }
3033
3034 static int
3035 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3036 {
3037         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3038
3039         iscsit_build_nopin_rsp(cmd, conn, hdr, true);
3040
3041         /*
3042          * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
3043          * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
3044          */
3045         pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size);
3046
3047         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3048                                                      cmd->buf_ptr,
3049                                                      cmd->buf_ptr_size);
3050 }
3051
3052 static int iscsit_send_r2t(
3053         struct iscsi_cmd *cmd,
3054         struct iscsi_conn *conn)
3055 {
3056         struct iscsi_r2t *r2t;
3057         struct iscsi_r2t_rsp *hdr;
3058         int ret;
3059
3060         r2t = iscsit_get_r2t_from_list(cmd);
3061         if (!r2t)
3062                 return -1;
3063
3064         hdr                     = (struct iscsi_r2t_rsp *) cmd->pdu;
3065         memset(hdr, 0, ISCSI_HDR_LEN);
3066         hdr->opcode             = ISCSI_OP_R2T;
3067         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3068         int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3069                         (struct scsi_lun *)&hdr->lun);
3070         hdr->itt                = cmd->init_task_tag;
3071         if (conn->conn_transport->iscsit_get_r2t_ttt)
3072                 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t);
3073         else
3074                 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
3075         hdr->ttt                = cpu_to_be32(r2t->targ_xfer_tag);
3076         hdr->statsn             = cpu_to_be32(conn->stat_sn);
3077         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3078         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3079         hdr->r2tsn              = cpu_to_be32(r2t->r2t_sn);
3080         hdr->data_offset        = cpu_to_be32(r2t->offset);
3081         hdr->data_length        = cpu_to_be32(r2t->xfer_len);
3082
3083         pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3084                 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3085                 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3086                 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3087                         r2t->offset, r2t->xfer_len, conn->cid);
3088
3089         spin_lock_bh(&cmd->r2t_lock);
3090         r2t->sent_r2t = 1;
3091         spin_unlock_bh(&cmd->r2t_lock);
3092
3093         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3094         if (ret < 0) {
3095                 return ret;
3096         }
3097
3098         spin_lock_bh(&cmd->dataout_timeout_lock);
3099         iscsit_start_dataout_timer(cmd, conn);
3100         spin_unlock_bh(&cmd->dataout_timeout_lock);
3101
3102         return 0;
3103 }
3104
3105 /*
3106  *      @recovery: If called from iscsi_task_reassign_complete_write() for
3107  *              connection recovery.
3108  */
3109 int iscsit_build_r2ts_for_cmd(
3110         struct iscsi_conn *conn,
3111         struct iscsi_cmd *cmd,
3112         bool recovery)
3113 {
3114         int first_r2t = 1;
3115         u32 offset = 0, xfer_len = 0;
3116
3117         spin_lock_bh(&cmd->r2t_lock);
3118         if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3119                 spin_unlock_bh(&cmd->r2t_lock);
3120                 return 0;
3121         }
3122
3123         if (conn->sess->sess_ops->DataSequenceInOrder &&
3124             !recovery)
3125                 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3126
3127         while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3128                 if (conn->sess->sess_ops->DataSequenceInOrder) {
3129                         offset = cmd->r2t_offset;
3130
3131                         if (first_r2t && recovery) {
3132                                 int new_data_end = offset +
3133                                         conn->sess->sess_ops->MaxBurstLength -
3134                                         cmd->next_burst_len;
3135
3136                                 if (new_data_end > cmd->se_cmd.data_length)
3137                                         xfer_len = cmd->se_cmd.data_length - offset;
3138                                 else
3139                                         xfer_len =
3140                                                 conn->sess->sess_ops->MaxBurstLength -
3141                                                 cmd->next_burst_len;
3142                         } else {
3143                                 int new_data_end = offset +
3144                                         conn->sess->sess_ops->MaxBurstLength;
3145
3146                                 if (new_data_end > cmd->se_cmd.data_length)
3147                                         xfer_len = cmd->se_cmd.data_length - offset;
3148                                 else
3149                                         xfer_len = conn->sess->sess_ops->MaxBurstLength;
3150                         }
3151                         cmd->r2t_offset += xfer_len;
3152
3153                         if (cmd->r2t_offset == cmd->se_cmd.data_length)
3154                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3155                 } else {
3156                         struct iscsi_seq *seq;
3157
3158                         seq = iscsit_get_seq_holder_for_r2t(cmd);
3159                         if (!seq) {
3160                                 spin_unlock_bh(&cmd->r2t_lock);
3161                                 return -1;
3162                         }
3163
3164                         offset = seq->offset;
3165                         xfer_len = seq->xfer_len;
3166
3167                         if (cmd->seq_send_order == cmd->seq_count)
3168                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3169                 }
3170                 cmd->outstanding_r2ts++;
3171                 first_r2t = 0;
3172
3173                 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3174                         spin_unlock_bh(&cmd->r2t_lock);
3175                         return -1;
3176                 }
3177
3178                 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3179                         break;
3180         }
3181         spin_unlock_bh(&cmd->r2t_lock);
3182
3183         return 0;
3184 }
3185 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd);
3186
3187 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3188                         bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3189 {
3190         if (inc_stat_sn)
3191                 cmd->stat_sn = conn->stat_sn++;
3192
3193         atomic_long_inc(&conn->sess->rsp_pdus);
3194
3195         memset(hdr, 0, ISCSI_HDR_LEN);
3196         hdr->opcode             = ISCSI_OP_SCSI_CMD_RSP;
3197         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3198         if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3199                 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3200                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3201         } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3202                 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3203                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3204         }
3205         hdr->response           = cmd->iscsi_response;
3206         hdr->cmd_status         = cmd->se_cmd.scsi_status;
3207         hdr->itt                = cmd->init_task_tag;
3208         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3209
3210         iscsit_increment_maxcmdsn(cmd, conn->sess);
3211         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3212         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3213
3214         pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3215                 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3216                 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3217                 cmd->se_cmd.scsi_status, conn->cid);
3218 }
3219 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3220
3221 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3222 {
3223         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3224         bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3225         void *data_buf = NULL;
3226         u32 padding = 0, data_buf_len = 0;
3227
3228         iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3229
3230         /*
3231          * Attach SENSE DATA payload to iSCSI Response PDU
3232          */
3233         if (cmd->se_cmd.sense_buffer &&
3234            ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3235             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3236                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3237                 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3238
3239                 padding         = -(cmd->se_cmd.scsi_sense_length) & 3;
3240                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3241                 data_buf = cmd->sense_buffer;
3242                 data_buf_len = cmd->se_cmd.scsi_sense_length + padding;
3243
3244                 if (padding) {
3245                         memset(cmd->sense_buffer +
3246                                 cmd->se_cmd.scsi_sense_length, 0, padding);
3247                         pr_debug("Adding %u bytes of padding to"
3248                                 " SENSE.\n", padding);
3249                 }
3250
3251                 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3252                                 " Response PDU\n",
3253                                 cmd->se_cmd.scsi_sense_length);
3254         }
3255
3256         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf,
3257                                                      data_buf_len);
3258 }
3259
3260 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3261 {
3262         switch (se_tmr->response) {
3263         case TMR_FUNCTION_COMPLETE:
3264                 return ISCSI_TMF_RSP_COMPLETE;
3265         case TMR_TASK_DOES_NOT_EXIST:
3266                 return ISCSI_TMF_RSP_NO_TASK;
3267         case TMR_LUN_DOES_NOT_EXIST:
3268                 return ISCSI_TMF_RSP_NO_LUN;
3269         case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3270                 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3271         case TMR_FUNCTION_REJECTED:
3272         default:
3273                 return ISCSI_TMF_RSP_REJECTED;
3274         }
3275 }
3276
3277 void
3278 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3279                           struct iscsi_tm_rsp *hdr)
3280 {
3281         struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3282
3283         hdr->opcode             = ISCSI_OP_SCSI_TMFUNC_RSP;
3284         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
3285         hdr->response           = iscsit_convert_tcm_tmr_rsp(se_tmr);
3286         hdr->itt                = cmd->init_task_tag;
3287         cmd->stat_sn            = conn->stat_sn++;
3288         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3289
3290         iscsit_increment_maxcmdsn(cmd, conn->sess);
3291         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3292         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3293
3294         pr_debug("Built Task Management Response ITT: 0x%08x,"
3295                 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3296                 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3297 }
3298 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3299
3300 static int
3301 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3302 {
3303         struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3304
3305         iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3306
3307         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3308 }
3309
3310 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3311 {
3312         bool ret = false;
3313
3314         if (np->np_sockaddr.ss_family == AF_INET6) {
3315                 const struct sockaddr_in6 sin6 = {
3316                         .sin6_addr = IN6ADDR_ANY_INIT };
3317                 struct sockaddr_in6 *sock_in6 =
3318                          (struct sockaddr_in6 *)&np->np_sockaddr;
3319
3320                 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3321                                 sin6.sin6_addr.s6_addr, 16))
3322                         ret = true;
3323         } else {
3324                 struct sockaddr_in * sock_in =
3325                         (struct sockaddr_in *)&np->np_sockaddr;
3326
3327                 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
3328                         ret = true;
3329         }
3330
3331         return ret;
3332 }
3333
3334 #define SENDTARGETS_BUF_LIMIT 32768U
3335
3336 static int
3337 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
3338                                   enum iscsit_transport_type network_transport,
3339                                   int skip_bytes, bool *completed)
3340 {
3341         char *payload = NULL;
3342         struct iscsi_conn *conn = cmd->conn;
3343         struct iscsi_portal_group *tpg;
3344         struct iscsi_tiqn *tiqn;
3345         struct iscsi_tpg_np *tpg_np;
3346         int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3347         int target_name_printed;
3348         unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3349         unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3350         bool active;
3351
3352         buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3353                          SENDTARGETS_BUF_LIMIT);
3354
3355         payload = kzalloc(buffer_len, GFP_KERNEL);
3356         if (!payload) {
3357                 pr_err("Unable to allocate memory for sendtargets"
3358                                 " response.\n");
3359                 return -ENOMEM;
3360         }
3361         /*
3362          * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3363          * explicit case..
3364          */
3365         if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3366                 text_ptr = strchr(text_in, '=');
3367                 if (!text_ptr) {
3368                         pr_err("Unable to locate '=' string in text_in:"
3369                                " %s\n", text_in);
3370                         kfree(payload);
3371                         return -EINVAL;
3372                 }
3373                 /*
3374                  * Skip over '=' character..
3375                  */
3376                 text_ptr += 1;
3377         }
3378
3379         spin_lock(&tiqn_lock);
3380         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3381                 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3382                      strcmp(tiqn->tiqn, text_ptr)) {
3383                         continue;
3384                 }
3385
3386                 target_name_printed = 0;
3387
3388                 spin_lock(&tiqn->tiqn_tpg_lock);
3389                 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3390
3391                         /* If demo_mode_discovery=0 and generate_node_acls=0
3392                          * (demo mode dislabed) do not return
3393                          * TargetName+TargetAddress unless a NodeACL exists.
3394                          */
3395
3396                         if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3397                             (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3398                             (!target_tpg_has_node_acl(&tpg->tpg_se_tpg,
3399                                 cmd->conn->sess->sess_ops->InitiatorName))) {
3400                                 continue;
3401                         }
3402
3403                         spin_lock(&tpg->tpg_state_lock);
3404                         active = (tpg->tpg_state == TPG_STATE_ACTIVE);
3405                         spin_unlock(&tpg->tpg_state_lock);
3406
3407                         if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets)
3408                                 continue;
3409
3410                         spin_lock(&tpg->tpg_np_lock);
3411                         list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3412                                                 tpg_np_list) {
3413                                 struct iscsi_np *np = tpg_np->tpg_np;
3414                                 bool inaddr_any = iscsit_check_inaddr_any(np);
3415                                 struct sockaddr_storage *sockaddr;
3416
3417                                 if (np->np_network_transport != network_transport)
3418                                         continue;
3419
3420                                 if (!target_name_printed) {
3421                                         len = sprintf(buf, "TargetName=%s",
3422                                                       tiqn->tiqn);
3423                                         len += 1;
3424
3425                                         if ((len + payload_len) > buffer_len) {
3426                                                 spin_unlock(&tpg->tpg_np_lock);
3427                                                 spin_unlock(&tiqn->tiqn_tpg_lock);
3428                                                 end_of_buf = 1;
3429                                                 goto eob;
3430                                         }
3431
3432                                         if (skip_bytes && len <= skip_bytes) {
3433                                                 skip_bytes -= len;
3434                                         } else {
3435                                                 memcpy(payload + payload_len, buf, len);
3436                                                 payload_len += len;
3437                                                 target_name_printed = 1;
3438                                                 if (len > skip_bytes)
3439                                                         skip_bytes = 0;
3440                                         }
3441                                 }
3442
3443                                 if (inaddr_any)
3444                                         sockaddr = &conn->local_sockaddr;
3445                                 else
3446                                         sockaddr = &np->np_sockaddr;
3447
3448                                 len = sprintf(buf, "TargetAddress="
3449                                               "%pISpc,%hu",
3450                                               sockaddr,
3451                                               tpg->tpgt);
3452                                 len += 1;
3453
3454                                 if ((len + payload_len) > buffer_len) {
3455                                         spin_unlock(&tpg->tpg_np_lock);
3456                                         spin_unlock(&tiqn->tiqn_tpg_lock);
3457                                         end_of_buf = 1;
3458                                         goto eob;
3459                                 }
3460
3461                                 if (skip_bytes && len <= skip_bytes) {
3462                                         skip_bytes -= len;
3463                                 } else {
3464                                         memcpy(payload + payload_len, buf, len);
3465                                         payload_len += len;
3466                                         if (len > skip_bytes)
3467                                                 skip_bytes = 0;
3468                                 }
3469                         }
3470                         spin_unlock(&tpg->tpg_np_lock);
3471                 }
3472                 spin_unlock(&tiqn->tiqn_tpg_lock);
3473 eob:
3474                 if (end_of_buf) {
3475                         *completed = false;
3476                         break;
3477                 }
3478
3479                 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3480                         break;
3481         }
3482         spin_unlock(&tiqn_lock);
3483
3484         cmd->buf_ptr = payload;
3485
3486         return payload_len;
3487 }
3488
3489 int
3490 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3491                       struct iscsi_text_rsp *hdr,
3492                       enum iscsit_transport_type network_transport)
3493 {
3494         int text_length, padding;
3495         bool completed = true;
3496
3497         text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3498                                                         cmd->read_data_done,
3499                                                         &completed);
3500         if (text_length < 0)
3501                 return text_length;
3502
3503         if (completed) {
3504                 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3505         } else {
3506                 hdr->flags |= ISCSI_FLAG_TEXT_CONTINUE;
3507                 cmd->read_data_done += text_length;
3508                 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3509                         cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3510         }
3511         hdr->opcode = ISCSI_OP_TEXT_RSP;
3512         padding = ((-text_length) & 3);
3513         hton24(hdr->dlength, text_length);
3514         hdr->itt = cmd->init_task_tag;
3515         hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3516         cmd->stat_sn = conn->stat_sn++;
3517         hdr->statsn = cpu_to_be32(cmd->stat_sn);
3518
3519         iscsit_increment_maxcmdsn(cmd, conn->sess);
3520         /*
3521          * Reset maxcmdsn_inc in multi-part text payload exchanges to
3522          * correctly increment MaxCmdSN for each response answering a
3523          * non immediate text request with a valid CmdSN.
3524          */
3525         cmd->maxcmdsn_inc = 0;
3526         hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3527         hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3528
3529         pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3530                 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3531                 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3532                 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3533                 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3534
3535         return text_length + padding;
3536 }
3537 EXPORT_SYMBOL(iscsit_build_text_rsp);
3538
3539 static int iscsit_send_text_rsp(
3540         struct iscsi_cmd *cmd,
3541         struct iscsi_conn *conn)
3542 {
3543         struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3544         int text_length;
3545
3546         text_length = iscsit_build_text_rsp(cmd, conn, hdr,
3547                                 conn->conn_transport->transport_type);
3548         if (text_length < 0)
3549                 return text_length;
3550
3551         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3552                                                      cmd->buf_ptr,
3553                                                      text_length);
3554 }
3555
3556 void
3557 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3558                     struct iscsi_reject *hdr)
3559 {
3560         hdr->opcode             = ISCSI_OP_REJECT;
3561         hdr->reason             = cmd->reject_reason;
3562         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3563         hton24(hdr->dlength, ISCSI_HDR_LEN);
3564         hdr->ffffffff           = cpu_to_be32(0xffffffff);
3565         cmd->stat_sn            = conn->stat_sn++;
3566         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3567         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3568         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3569
3570 }
3571 EXPORT_SYMBOL(iscsit_build_reject);
3572
3573 static int iscsit_send_reject(
3574         struct iscsi_cmd *cmd,
3575         struct iscsi_conn *conn)
3576 {
3577         struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3578
3579         iscsit_build_reject(cmd, conn, hdr);
3580
3581         pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3582                 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3583
3584         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3585                                                      cmd->buf_ptr,
3586                                                      ISCSI_HDR_LEN);
3587 }
3588
3589 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3590 {
3591         int ord, cpu;
3592         /*
3593          * bitmap_id is assigned from iscsit_global->ts_bitmap from
3594          * within iscsit_start_kthreads()
3595          *
3596          * Here we use bitmap_id to determine which CPU that this
3597          * iSCSI connection's RX/TX threads will be scheduled to
3598          * execute upon.
3599          */
3600         ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3601         for_each_online_cpu(cpu) {
3602                 if (ord-- == 0) {
3603                         cpumask_set_cpu(cpu, conn->conn_cpumask);
3604                         return;
3605                 }
3606         }
3607         /*
3608          * This should never be reached..
3609          */
3610         dump_stack();
3611         cpumask_setall(conn->conn_cpumask);
3612 }
3613
3614 int
3615 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3616 {
3617         int ret;
3618
3619         switch (state) {
3620         case ISTATE_SEND_R2T:
3621                 ret = iscsit_send_r2t(cmd, conn);
3622                 if (ret < 0)
3623                         goto err;
3624                 break;
3625         case ISTATE_REMOVE:
3626                 spin_lock_bh(&conn->cmd_lock);
3627                 list_del_init(&cmd->i_conn_node);
3628                 spin_unlock_bh(&conn->cmd_lock);
3629
3630                 iscsit_free_cmd(cmd, false);
3631                 break;
3632         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3633                 iscsit_mod_nopin_response_timer(conn);
3634                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3635                 if (ret < 0)
3636                         goto err;
3637                 break;
3638         case ISTATE_SEND_NOPIN_NO_RESPONSE:
3639                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3640                 if (ret < 0)
3641                         goto err;
3642                 break;
3643         default:
3644                 pr_err("Unknown Opcode: 0x%02x ITT:"
3645                        " 0x%08x, i_state: %d on CID: %hu\n",
3646                        cmd->iscsi_opcode, cmd->init_task_tag, state,
3647                        conn->cid);
3648                 goto err;
3649         }
3650
3651         return 0;
3652
3653 err:
3654         return -1;
3655 }
3656 EXPORT_SYMBOL(iscsit_immediate_queue);
3657
3658 static int
3659 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3660 {
3661         struct iscsit_transport *t = conn->conn_transport;
3662         struct iscsi_queue_req *qr;
3663         struct iscsi_cmd *cmd;
3664         u8 state;
3665         int ret;
3666
3667         while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3668                 atomic_set(&conn->check_immediate_queue, 0);
3669                 cmd = qr->cmd;
3670                 state = qr->state;
3671                 kmem_cache_free(lio_qr_cache, qr);
3672
3673                 ret = t->iscsit_immediate_queue(conn, cmd, state);
3674                 if (ret < 0)
3675                         return ret;
3676         }
3677
3678         return 0;
3679 }
3680
3681 int
3682 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3683 {
3684         int ret;
3685
3686 check_rsp_state:
3687         switch (state) {
3688         case ISTATE_SEND_DATAIN:
3689                 ret = iscsit_send_datain(cmd, conn);
3690                 if (ret < 0)
3691                         goto err;
3692                 else if (!ret)
3693                         /* more drs */
3694                         goto check_rsp_state;
3695                 else if (ret == 1) {
3696                         /* all done */
3697                         spin_lock_bh(&cmd->istate_lock);
3698                         cmd->i_state = ISTATE_SENT_STATUS;
3699                         spin_unlock_bh(&cmd->istate_lock);
3700
3701                         if (atomic_read(&conn->check_immediate_queue))
3702                                 return 1;
3703
3704                         return 0;
3705                 } else if (ret == 2) {
3706                         /* Still must send status,
3707                            SCF_TRANSPORT_TASK_SENSE was set */
3708                         spin_lock_bh(&cmd->istate_lock);
3709                         cmd->i_state = ISTATE_SEND_STATUS;
3710                         spin_unlock_bh(&cmd->istate_lock);
3711                         state = ISTATE_SEND_STATUS;
3712                         goto check_rsp_state;
3713                 }
3714
3715                 break;
3716         case ISTATE_SEND_STATUS:
3717         case ISTATE_SEND_STATUS_RECOVERY:
3718                 ret = iscsit_send_response(cmd, conn);
3719                 break;
3720         case ISTATE_SEND_LOGOUTRSP:
3721                 ret = iscsit_send_logout(cmd, conn);
3722                 break;
3723         case ISTATE_SEND_ASYNCMSG:
3724                 ret = iscsit_send_conn_drop_async_message(
3725                         cmd, conn);
3726                 break;
3727         case ISTATE_SEND_NOPIN:
3728                 ret = iscsit_send_nopin(cmd, conn);
3729                 break;
3730         case ISTATE_SEND_REJECT:
3731                 ret = iscsit_send_reject(cmd, conn);
3732                 break;
3733         case ISTATE_SEND_TASKMGTRSP:
3734                 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3735                 if (ret != 0)
3736                         break;
3737                 ret = iscsit_tmr_post_handler(cmd, conn);
3738                 if (ret != 0)
3739                         iscsit_fall_back_to_erl0(conn->sess);
3740                 break;
3741         case ISTATE_SEND_TEXTRSP:
3742                 ret = iscsit_send_text_rsp(cmd, conn);
3743                 break;
3744         default:
3745                 pr_err("Unknown Opcode: 0x%02x ITT:"
3746                        " 0x%08x, i_state: %d on CID: %hu\n",
3747                        cmd->iscsi_opcode, cmd->init_task_tag,
3748                        state, conn->cid);
3749                 goto err;
3750         }
3751         if (ret < 0)
3752                 goto err;
3753
3754         switch (state) {
3755         case ISTATE_SEND_LOGOUTRSP:
3756                 if (!iscsit_logout_post_handler(cmd, conn))
3757                         return -ECONNRESET;
3758                 /* fall through */
3759         case ISTATE_SEND_STATUS:
3760         case ISTATE_SEND_ASYNCMSG:
3761         case ISTATE_SEND_NOPIN:
3762         case ISTATE_SEND_STATUS_RECOVERY:
3763         case ISTATE_SEND_TEXTRSP:
3764         case ISTATE_SEND_TASKMGTRSP:
3765         case ISTATE_SEND_REJECT:
3766                 spin_lock_bh(&cmd->istate_lock);
3767                 cmd->i_state = ISTATE_SENT_STATUS;
3768                 spin_unlock_bh(&cmd->istate_lock);
3769                 break;
3770         default:
3771                 pr_err("Unknown Opcode: 0x%02x ITT:"
3772                        " 0x%08x, i_state: %d on CID: %hu\n",
3773                        cmd->iscsi_opcode, cmd->init_task_tag,
3774                        cmd->i_state, conn->cid);
3775                 goto err;
3776         }
3777
3778         if (atomic_read(&conn->check_immediate_queue))
3779                 return 1;
3780
3781         return 0;
3782
3783 err:
3784         return -1;
3785 }
3786 EXPORT_SYMBOL(iscsit_response_queue);
3787
3788 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3789 {
3790         struct iscsit_transport *t = conn->conn_transport;
3791         struct iscsi_queue_req *qr;
3792         struct iscsi_cmd *cmd;
3793         u8 state;
3794         int ret;
3795
3796         while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3797                 cmd = qr->cmd;
3798                 state = qr->state;
3799                 kmem_cache_free(lio_qr_cache, qr);
3800
3801                 ret = t->iscsit_response_queue(conn, cmd, state);
3802                 if (ret == 1 || ret < 0)
3803                         return ret;
3804         }
3805
3806         return 0;
3807 }
3808
3809 int iscsi_target_tx_thread(void *arg)
3810 {
3811         int ret = 0;
3812         struct iscsi_conn *conn = arg;
3813         /*
3814          * Allow ourselves to be interrupted by SIGINT so that a
3815          * connection recovery / failure event can be triggered externally.
3816          */
3817         allow_signal(SIGINT);
3818
3819         while (!kthread_should_stop()) {
3820                 /*
3821                  * Ensure that both TX and RX per connection kthreads
3822                  * are scheduled to run on the same CPU.
3823                  */
3824                 iscsit_thread_check_cpumask(conn, current, 1);
3825
3826                 wait_event_interruptible(conn->queues_wq,
3827                                          !iscsit_conn_all_queues_empty(conn));
3828
3829                 if (signal_pending(current))
3830                         goto transport_err;
3831
3832 get_immediate:
3833                 ret = iscsit_handle_immediate_queue(conn);
3834                 if (ret < 0)
3835                         goto transport_err;
3836
3837                 ret = iscsit_handle_response_queue(conn);
3838                 if (ret == 1)
3839                         goto get_immediate;
3840                 else if (ret == -ECONNRESET)
3841                         goto out;
3842                 else if (ret < 0)
3843                         goto transport_err;
3844         }
3845
3846 transport_err:
3847         /*
3848          * Avoid the normal connection failure code-path if this connection
3849          * is still within LOGIN mode, and iscsi_np process context is
3850          * responsible for cleaning up the early connection failure.
3851          */
3852         if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
3853                 iscsit_take_action_for_connection_exit(conn);
3854 out:
3855         return 0;
3856 }
3857
3858 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3859 {
3860         struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3861         struct iscsi_cmd *cmd;
3862         int ret = 0;
3863
3864         switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3865         case ISCSI_OP_SCSI_CMD:
3866                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3867                 if (!cmd)
3868                         goto reject;
3869
3870                 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3871                 break;
3872         case ISCSI_OP_SCSI_DATA_OUT:
3873                 ret = iscsit_handle_data_out(conn, buf);
3874                 break;
3875         case ISCSI_OP_NOOP_OUT:
3876                 cmd = NULL;
3877                 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3878                         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3879                         if (!cmd)
3880                                 goto reject;
3881                 }
3882                 ret = iscsit_handle_nop_out(conn, cmd, buf);
3883                 break;
3884         case ISCSI_OP_SCSI_TMFUNC:
3885                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3886                 if (!cmd)
3887                         goto reject;
3888
3889                 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3890                 break;
3891         case ISCSI_OP_TEXT:
3892                 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
3893                         cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
3894                         if (!cmd)
3895                                 goto reject;
3896                 } else {
3897                         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3898                         if (!cmd)
3899                                 goto reject;
3900                 }
3901
3902                 ret = iscsit_handle_text_cmd(conn, cmd, buf);
3903                 break;
3904         case ISCSI_OP_LOGOUT:
3905                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3906                 if (!cmd)
3907                         goto reject;
3908
3909                 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3910                 if (ret > 0)
3911                         wait_for_completion_timeout(&conn->conn_logout_comp,
3912                                         SECONDS_FOR_LOGOUT_COMP * HZ);
3913                 break;
3914         case ISCSI_OP_SNACK:
3915                 ret = iscsit_handle_snack(conn, buf);
3916                 break;
3917         default:
3918                 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
3919                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3920                         pr_err("Cannot recover from unknown"
3921                         " opcode while ERL=0, closing iSCSI connection.\n");
3922                         return -1;
3923                 }
3924                 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
3925                        " closing iSCSI connection.\n");
3926                 ret = -1;
3927                 break;
3928         }
3929
3930         return ret;
3931 reject:
3932         return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3933 }
3934
3935 static bool iscsi_target_check_conn_state(struct iscsi_conn *conn)
3936 {
3937         bool ret;
3938
3939         spin_lock_bh(&conn->state_lock);
3940         ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN);
3941         spin_unlock_bh(&conn->state_lock);
3942
3943         return ret;
3944 }
3945
3946 static void iscsit_get_rx_pdu(struct iscsi_conn *conn)
3947 {
3948         int ret;
3949         u8 buffer[ISCSI_HDR_LEN], opcode;
3950         u32 checksum = 0, digest = 0;
3951         struct kvec iov;
3952
3953         while (!kthread_should_stop()) {
3954                 /*
3955                  * Ensure that both TX and RX per connection kthreads
3956                  * are scheduled to run on the same CPU.
3957                  */
3958                 iscsit_thread_check_cpumask(conn, current, 0);
3959
3960                 memset(buffer, 0, ISCSI_HDR_LEN);
3961                 memset(&iov, 0, sizeof(struct kvec));
3962
3963                 iov.iov_base    = buffer;
3964                 iov.iov_len     = ISCSI_HDR_LEN;
3965
3966                 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3967                 if (ret != ISCSI_HDR_LEN) {
3968                         iscsit_rx_thread_wait_for_tcp(conn);
3969                         return;
3970                 }
3971
3972                 if (conn->conn_ops->HeaderDigest) {
3973                         iov.iov_base    = &digest;
3974                         iov.iov_len     = ISCSI_CRC_LEN;
3975
3976                         ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3977                         if (ret != ISCSI_CRC_LEN) {
3978                                 iscsit_rx_thread_wait_for_tcp(conn);
3979                                 return;
3980                         }
3981
3982                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
3983                                         buffer, ISCSI_HDR_LEN,
3984                                         0, NULL, (u8 *)&checksum);
3985
3986                         if (digest != checksum) {
3987                                 pr_err("HeaderDigest CRC32C failed,"
3988                                         " received 0x%08x, computed 0x%08x\n",
3989                                         digest, checksum);
3990                                 /*
3991                                  * Set the PDU to 0xff so it will intentionally
3992                                  * hit default in the switch below.
3993                                  */
3994                                 memset(buffer, 0xff, ISCSI_HDR_LEN);
3995                                 atomic_long_inc(&conn->sess->conn_digest_errors);
3996                         } else {
3997                                 pr_debug("Got HeaderDigest CRC32C"
3998                                                 " 0x%08x\n", checksum);
3999                         }
4000                 }
4001
4002                 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4003                         return;
4004
4005                 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4006
4007                 if (conn->sess->sess_ops->SessionType &&
4008                    ((!(opcode & ISCSI_OP_TEXT)) ||
4009                     (!(opcode & ISCSI_OP_LOGOUT)))) {
4010                         pr_err("Received illegal iSCSI Opcode: 0x%02x"
4011                         " while in Discovery Session, rejecting.\n", opcode);
4012                         iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4013                                           buffer);
4014                         return;
4015                 }
4016
4017                 ret = iscsi_target_rx_opcode(conn, buffer);
4018                 if (ret < 0)
4019                         return;
4020         }
4021 }
4022
4023 int iscsi_target_rx_thread(void *arg)
4024 {
4025         int rc;
4026         struct iscsi_conn *conn = arg;
4027
4028         /*
4029          * Allow ourselves to be interrupted by SIGINT so that a
4030          * connection recovery / failure event can be triggered externally.
4031          */
4032         allow_signal(SIGINT);
4033         /*
4034          * Wait for iscsi_post_login_handler() to complete before allowing
4035          * incoming iscsi/tcp socket I/O, and/or failing the connection.
4036          */
4037         rc = wait_for_completion_interruptible(&conn->rx_login_comp);
4038         if (rc < 0 || iscsi_target_check_conn_state(conn))
4039                 return 0;
4040
4041         if (!conn->conn_transport->iscsit_get_rx_pdu)
4042                 return 0;
4043
4044         conn->conn_transport->iscsit_get_rx_pdu(conn);
4045
4046         if (!signal_pending(current))
4047                 atomic_set(&conn->transport_failed, 1);
4048         iscsit_take_action_for_connection_exit(conn);
4049         return 0;
4050 }
4051
4052 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4053 {
4054         LIST_HEAD(tmp_list);
4055         struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4056         struct iscsi_session *sess = conn->sess;
4057         /*
4058          * We expect this function to only ever be called from either RX or TX
4059          * thread context via iscsit_close_connection() once the other context
4060          * has been reset -> returned sleeping pre-handler state.
4061          */
4062         spin_lock_bh(&conn->cmd_lock);
4063         list_splice_init(&conn->conn_cmd_list, &tmp_list);
4064
4065         list_for_each_entry(cmd, &tmp_list, i_conn_node) {
4066                 struct se_cmd *se_cmd = &cmd->se_cmd;
4067
4068                 if (se_cmd->se_tfo != NULL) {
4069                         spin_lock(&se_cmd->t_state_lock);
4070                         se_cmd->transport_state |= CMD_T_FABRIC_STOP;
4071                         spin_unlock(&se_cmd->t_state_lock);
4072                 }
4073         }
4074         spin_unlock_bh(&conn->cmd_lock);
4075
4076         list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4077                 list_del_init(&cmd->i_conn_node);
4078
4079                 iscsit_increment_maxcmdsn(cmd, sess);
4080                 iscsit_free_cmd(cmd, true);
4081
4082         }
4083 }
4084
4085 static void iscsit_stop_timers_for_cmds(
4086         struct iscsi_conn *conn)
4087 {
4088         struct iscsi_cmd *cmd;
4089
4090         spin_lock_bh(&conn->cmd_lock);
4091         list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4092                 if (cmd->data_direction == DMA_TO_DEVICE)
4093                         iscsit_stop_dataout_timer(cmd);
4094         }
4095         spin_unlock_bh(&conn->cmd_lock);
4096 }
4097
4098 int iscsit_close_connection(
4099         struct iscsi_conn *conn)
4100 {
4101         int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4102         struct iscsi_session    *sess = conn->sess;
4103
4104         pr_debug("Closing iSCSI connection CID %hu on SID:"
4105                 " %u\n", conn->cid, sess->sid);
4106         /*
4107          * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD
4108          * case just in case the RX Thread in iscsi_target_rx_opcode() is
4109          * sleeping and the logout response never got sent because the
4110          * connection failed.
4111          *
4112          * However for iser-target, isert_wait4logout() is using conn_logout_comp
4113          * to signal logout response TX interrupt completion.  Go ahead and skip
4114          * this for iser since isert_rx_opcode() does not wait on logout failure,
4115          * and to avoid iscsi_conn pointer dereference in iser-target code.
4116          */
4117         if (!conn->conn_transport->rdma_shutdown)
4118                 complete(&conn->conn_logout_comp);
4119
4120         if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4121                 if (conn->tx_thread &&
4122                     cmpxchg(&conn->tx_thread_active, true, false)) {
4123                         send_sig(SIGINT, conn->tx_thread, 1);
4124                         kthread_stop(conn->tx_thread);
4125                 }
4126         } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4127                 if (conn->rx_thread &&
4128                     cmpxchg(&conn->rx_thread_active, true, false)) {
4129                         send_sig(SIGINT, conn->rx_thread, 1);
4130                         kthread_stop(conn->rx_thread);
4131                 }
4132         }
4133
4134         spin_lock(&iscsit_global->ts_bitmap_lock);
4135         bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4136                               get_order(1));
4137         spin_unlock(&iscsit_global->ts_bitmap_lock);
4138
4139         iscsit_stop_timers_for_cmds(conn);
4140         iscsit_stop_nopin_response_timer(conn);
4141         iscsit_stop_nopin_timer(conn);
4142
4143         if (conn->conn_transport->iscsit_wait_conn)
4144                 conn->conn_transport->iscsit_wait_conn(conn);
4145
4146         /*
4147          * During Connection recovery drop unacknowledged out of order
4148          * commands for this connection, and prepare the other commands
4149          * for reallegiance.
4150          *
4151          * During normal operation clear the out of order commands (but
4152          * do not free the struct iscsi_ooo_cmdsn's) and release all
4153          * struct iscsi_cmds.
4154          */
4155         if (atomic_read(&conn->connection_recovery)) {
4156                 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4157                 iscsit_prepare_cmds_for_reallegiance(conn);
4158         } else {
4159                 iscsit_clear_ooo_cmdsns_for_conn(conn);
4160                 iscsit_release_commands_from_conn(conn);
4161         }
4162         iscsit_free_queue_reqs_for_conn(conn);
4163
4164         /*
4165          * Handle decrementing session or connection usage count if
4166          * a logout response was not able to be sent because the
4167          * connection failed.  Fall back to Session Recovery here.
4168          */
4169         if (atomic_read(&conn->conn_logout_remove)) {
4170                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4171                         iscsit_dec_conn_usage_count(conn);
4172                         iscsit_dec_session_usage_count(sess);
4173                 }
4174                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4175                         iscsit_dec_conn_usage_count(conn);
4176
4177                 atomic_set(&conn->conn_logout_remove, 0);
4178                 atomic_set(&sess->session_reinstatement, 0);
4179                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4180         }
4181
4182         spin_lock_bh(&sess->conn_lock);
4183         list_del(&conn->conn_list);
4184
4185         /*
4186          * Attempt to let the Initiator know this connection failed by
4187          * sending an Connection Dropped Async Message on another
4188          * active connection.
4189          */
4190         if (atomic_read(&conn->connection_recovery))
4191                 iscsit_build_conn_drop_async_message(conn);
4192
4193         spin_unlock_bh(&sess->conn_lock);
4194
4195         /*
4196          * If connection reinstatement is being performed on this connection,
4197          * up the connection reinstatement semaphore that is being blocked on
4198          * in iscsit_cause_connection_reinstatement().
4199          */
4200         spin_lock_bh(&conn->state_lock);
4201         if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4202                 spin_unlock_bh(&conn->state_lock);
4203                 complete(&conn->conn_wait_comp);
4204                 wait_for_completion(&conn->conn_post_wait_comp);
4205                 spin_lock_bh(&conn->state_lock);
4206         }
4207
4208         /*
4209          * If connection reinstatement is being performed on this connection
4210          * by receiving a REMOVECONNFORRECOVERY logout request, up the
4211          * connection wait rcfr semaphore that is being blocked on
4212          * an iscsit_connection_reinstatement_rcfr().
4213          */
4214         if (atomic_read(&conn->connection_wait_rcfr)) {
4215                 spin_unlock_bh(&conn->state_lock);
4216                 complete(&conn->conn_wait_rcfr_comp);
4217                 wait_for_completion(&conn->conn_post_wait_comp);
4218                 spin_lock_bh(&conn->state_lock);
4219         }
4220         atomic_set(&conn->connection_reinstatement, 1);
4221         spin_unlock_bh(&conn->state_lock);
4222
4223         /*
4224          * If any other processes are accessing this connection pointer we
4225          * must wait until they have completed.
4226          */
4227         iscsit_check_conn_usage_count(conn);
4228
4229         ahash_request_free(conn->conn_tx_hash);
4230         if (conn->conn_rx_hash) {
4231                 struct crypto_ahash *tfm;
4232
4233                 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
4234                 ahash_request_free(conn->conn_rx_hash);
4235                 crypto_free_ahash(tfm);
4236         }
4237
4238         free_cpumask_var(conn->conn_cpumask);
4239
4240         kfree(conn->conn_ops);
4241         conn->conn_ops = NULL;
4242
4243         if (conn->sock)
4244                 sock_release(conn->sock);
4245
4246         if (conn->conn_transport->iscsit_free_conn)
4247                 conn->conn_transport->iscsit_free_conn(conn);
4248
4249         iscsit_put_transport(conn->conn_transport);
4250
4251         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4252         conn->conn_state = TARG_CONN_STATE_FREE;
4253         kfree(conn);
4254
4255         spin_lock_bh(&sess->conn_lock);
4256         atomic_dec(&sess->nconn);
4257         pr_debug("Decremented iSCSI connection count to %hu from node:"
4258                 " %s\n", atomic_read(&sess->nconn),
4259                 sess->sess_ops->InitiatorName);
4260         /*
4261          * Make sure that if one connection fails in an non ERL=2 iSCSI
4262          * Session that they all fail.
4263          */
4264         if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4265              !atomic_read(&sess->session_logout))
4266                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4267
4268         /*
4269          * If this was not the last connection in the session, and we are
4270          * performing session reinstatement or falling back to ERL=0, call
4271          * iscsit_stop_session() without sleeping to shutdown the other
4272          * active connections.
4273          */
4274         if (atomic_read(&sess->nconn)) {
4275                 if (!atomic_read(&sess->session_reinstatement) &&
4276                     !atomic_read(&sess->session_fall_back_to_erl0)) {
4277                         spin_unlock_bh(&sess->conn_lock);
4278                         return 0;
4279                 }
4280                 if (!atomic_read(&sess->session_stop_active)) {
4281                         atomic_set(&sess->session_stop_active, 1);
4282                         spin_unlock_bh(&sess->conn_lock);
4283                         iscsit_stop_session(sess, 0, 0);
4284                         return 0;
4285                 }
4286                 spin_unlock_bh(&sess->conn_lock);
4287                 return 0;
4288         }
4289
4290         /*
4291          * If this was the last connection in the session and one of the
4292          * following is occurring:
4293          *
4294          * Session Reinstatement is not being performed, and are falling back
4295          * to ERL=0 call iscsit_close_session().
4296          *
4297          * Session Logout was requested.  iscsit_close_session() will be called
4298          * elsewhere.
4299          *
4300          * Session Continuation is not being performed, start the Time2Retain
4301          * handler and check if sleep_on_sess_wait_sem is active.
4302          */
4303         if (!atomic_read(&sess->session_reinstatement) &&
4304              atomic_read(&sess->session_fall_back_to_erl0)) {
4305                 spin_unlock_bh(&sess->conn_lock);
4306                 iscsit_close_session(sess);
4307
4308                 return 0;
4309         } else if (atomic_read(&sess->session_logout)) {
4310                 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4311                 sess->session_state = TARG_SESS_STATE_FREE;
4312                 spin_unlock_bh(&sess->conn_lock);
4313
4314                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4315                         complete(&sess->session_wait_comp);
4316
4317                 return 0;
4318         } else {
4319                 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4320                 sess->session_state = TARG_SESS_STATE_FAILED;
4321
4322                 if (!atomic_read(&sess->session_continuation)) {
4323                         spin_unlock_bh(&sess->conn_lock);
4324                         iscsit_start_time2retain_handler(sess);
4325                 } else
4326                         spin_unlock_bh(&sess->conn_lock);
4327
4328                 if (atomic_read(&sess->sleep_on_sess_wait_comp))
4329                         complete(&sess->session_wait_comp);
4330
4331                 return 0;
4332         }
4333 }
4334
4335 /*
4336  * If the iSCSI Session for the iSCSI Initiator Node exists,
4337  * forcefully shutdown the iSCSI NEXUS.
4338  */
4339 int iscsit_close_session(struct iscsi_session *sess)
4340 {
4341         struct iscsi_portal_group *tpg = sess->tpg;
4342         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4343
4344         if (atomic_read(&sess->nconn)) {
4345                 pr_err("%d connection(s) still exist for iSCSI session"
4346                         " to %s\n", atomic_read(&sess->nconn),
4347                         sess->sess_ops->InitiatorName);
4348                 BUG();
4349         }
4350
4351         spin_lock_bh(&se_tpg->session_lock);
4352         atomic_set(&sess->session_logout, 1);
4353         atomic_set(&sess->session_reinstatement, 1);
4354         iscsit_stop_time2retain_timer(sess);
4355         spin_unlock_bh(&se_tpg->session_lock);
4356
4357         /*
4358          * transport_deregister_session_configfs() will clear the
4359          * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4360          * can be setting it again with __transport_register_session() in
4361          * iscsi_post_login_handler() again after the iscsit_stop_session()
4362          * completes in iscsi_np context.
4363          */
4364         transport_deregister_session_configfs(sess->se_sess);
4365
4366         /*
4367          * If any other processes are accessing this session pointer we must
4368          * wait until they have completed.  If we are in an interrupt (the
4369          * time2retain handler) and contain and active session usage count we
4370          * restart the timer and exit.
4371          */
4372         if (!in_interrupt()) {
4373                 if (iscsit_check_session_usage_count(sess) == 1)
4374                         iscsit_stop_session(sess, 1, 1);
4375         } else {
4376                 if (iscsit_check_session_usage_count(sess) == 2) {
4377                         atomic_set(&sess->session_logout, 0);
4378                         iscsit_start_time2retain_handler(sess);
4379                         return 0;
4380                 }
4381         }
4382
4383         transport_deregister_session(sess->se_sess);
4384
4385         if (sess->sess_ops->ErrorRecoveryLevel == 2)
4386                 iscsit_free_connection_recovery_entires(sess);
4387
4388         iscsit_free_all_ooo_cmdsns(sess);
4389
4390         spin_lock_bh(&se_tpg->session_lock);
4391         pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4392         sess->session_state = TARG_SESS_STATE_FREE;
4393         pr_debug("Released iSCSI session from node: %s\n",
4394                         sess->sess_ops->InitiatorName);
4395         tpg->nsessions--;
4396         if (tpg->tpg_tiqn)
4397                 tpg->tpg_tiqn->tiqn_nsessions--;
4398
4399         pr_debug("Decremented number of active iSCSI Sessions on"
4400                 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4401
4402         spin_lock(&sess_idr_lock);
4403         idr_remove(&sess_idr, sess->session_index);
4404         spin_unlock(&sess_idr_lock);
4405
4406         kfree(sess->sess_ops);
4407         sess->sess_ops = NULL;
4408         spin_unlock_bh(&se_tpg->session_lock);
4409
4410         kfree(sess);
4411         return 0;
4412 }
4413
4414 static void iscsit_logout_post_handler_closesession(
4415         struct iscsi_conn *conn)
4416 {
4417         struct iscsi_session *sess = conn->sess;
4418         int sleep = 1;
4419         /*
4420          * Traditional iscsi/tcp will invoke this logic from TX thread
4421          * context during session logout, so clear tx_thread_active and
4422          * sleep if iscsit_close_connection() has not already occured.
4423          *
4424          * Since iser-target invokes this logic from it's own workqueue,
4425          * always sleep waiting for RX/TX thread shutdown to complete
4426          * within iscsit_close_connection().
4427          */
4428         if (!conn->conn_transport->rdma_shutdown)
4429                 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4430
4431         atomic_set(&conn->conn_logout_remove, 0);
4432         complete(&conn->conn_logout_comp);
4433
4434         iscsit_dec_conn_usage_count(conn);
4435         iscsit_stop_session(sess, sleep, sleep);
4436         iscsit_dec_session_usage_count(sess);
4437         iscsit_close_session(sess);
4438 }
4439
4440 static void iscsit_logout_post_handler_samecid(
4441         struct iscsi_conn *conn)
4442 {
4443         int sleep = 1;
4444
4445         if (!conn->conn_transport->rdma_shutdown)
4446                 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4447
4448         atomic_set(&conn->conn_logout_remove, 0);
4449         complete(&conn->conn_logout_comp);
4450
4451         iscsit_cause_connection_reinstatement(conn, sleep);
4452         iscsit_dec_conn_usage_count(conn);
4453 }
4454
4455 static void iscsit_logout_post_handler_diffcid(
4456         struct iscsi_conn *conn,
4457         u16 cid)
4458 {
4459         struct iscsi_conn *l_conn;
4460         struct iscsi_session *sess = conn->sess;
4461         bool conn_found = false;
4462
4463         if (!sess)
4464                 return;
4465
4466         spin_lock_bh(&sess->conn_lock);
4467         list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4468                 if (l_conn->cid == cid) {
4469                         iscsit_inc_conn_usage_count(l_conn);
4470                         conn_found = true;
4471                         break;
4472                 }
4473         }
4474         spin_unlock_bh(&sess->conn_lock);
4475
4476         if (!conn_found)
4477                 return;
4478
4479         if (l_conn->sock)
4480                 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4481
4482         spin_lock_bh(&l_conn->state_lock);
4483         pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4484         l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4485         spin_unlock_bh(&l_conn->state_lock);
4486
4487         iscsit_cause_connection_reinstatement(l_conn, 1);
4488         iscsit_dec_conn_usage_count(l_conn);
4489 }
4490
4491 /*
4492  *      Return of 0 causes the TX thread to restart.
4493  */
4494 int iscsit_logout_post_handler(
4495         struct iscsi_cmd *cmd,
4496         struct iscsi_conn *conn)
4497 {
4498         int ret = 0;
4499
4500         switch (cmd->logout_reason) {
4501         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4502                 switch (cmd->logout_response) {
4503                 case ISCSI_LOGOUT_SUCCESS:
4504                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4505                 default:
4506                         iscsit_logout_post_handler_closesession(conn);
4507                         break;
4508                 }
4509                 ret = 0;
4510                 break;
4511         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4512                 if (conn->cid == cmd->logout_cid) {
4513                         switch (cmd->logout_response) {
4514                         case ISCSI_LOGOUT_SUCCESS:
4515                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4516                         default:
4517                                 iscsit_logout_post_handler_samecid(conn);
4518                                 break;
4519                         }
4520                         ret = 0;
4521                 } else {
4522                         switch (cmd->logout_response) {
4523                         case ISCSI_LOGOUT_SUCCESS:
4524                                 iscsit_logout_post_handler_diffcid(conn,
4525                                         cmd->logout_cid);
4526                                 break;
4527                         case ISCSI_LOGOUT_CID_NOT_FOUND:
4528                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4529                         default:
4530                                 break;
4531                         }
4532                         ret = 1;
4533                 }
4534                 break;
4535         case ISCSI_LOGOUT_REASON_RECOVERY:
4536                 switch (cmd->logout_response) {
4537                 case ISCSI_LOGOUT_SUCCESS:
4538                 case ISCSI_LOGOUT_CID_NOT_FOUND:
4539                 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4540                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4541                 default:
4542                         break;
4543                 }
4544                 ret = 1;
4545                 break;
4546         default:
4547                 break;
4548
4549         }
4550         return ret;
4551 }
4552 EXPORT_SYMBOL(iscsit_logout_post_handler);
4553
4554 void iscsit_fail_session(struct iscsi_session *sess)
4555 {
4556         struct iscsi_conn *conn;
4557
4558         spin_lock_bh(&sess->conn_lock);
4559         list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4560                 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4561                 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4562         }
4563         spin_unlock_bh(&sess->conn_lock);
4564
4565         pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4566         sess->session_state = TARG_SESS_STATE_FAILED;
4567 }
4568
4569 int iscsit_free_session(struct iscsi_session *sess)
4570 {
4571         u16 conn_count = atomic_read(&sess->nconn);
4572         struct iscsi_conn *conn, *conn_tmp = NULL;
4573         int is_last;
4574
4575         spin_lock_bh(&sess->conn_lock);
4576         atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4577
4578         list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4579                         conn_list) {
4580                 if (conn_count == 0)
4581                         break;
4582
4583                 if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4584                         is_last = 1;
4585                 } else {
4586                         iscsit_inc_conn_usage_count(conn_tmp);
4587                         is_last = 0;
4588                 }
4589                 iscsit_inc_conn_usage_count(conn);
4590
4591                 spin_unlock_bh(&sess->conn_lock);
4592                 iscsit_cause_connection_reinstatement(conn, 1);
4593                 spin_lock_bh(&sess->conn_lock);
4594
4595                 iscsit_dec_conn_usage_count(conn);
4596                 if (is_last == 0)
4597                         iscsit_dec_conn_usage_count(conn_tmp);
4598
4599                 conn_count--;
4600         }
4601
4602         if (atomic_read(&sess->nconn)) {
4603                 spin_unlock_bh(&sess->conn_lock);
4604                 wait_for_completion(&sess->session_wait_comp);
4605         } else
4606                 spin_unlock_bh(&sess->conn_lock);
4607
4608         iscsit_close_session(sess);
4609         return 0;
4610 }
4611
4612 void iscsit_stop_session(
4613         struct iscsi_session *sess,
4614         int session_sleep,
4615         int connection_sleep)
4616 {
4617         u16 conn_count = atomic_read(&sess->nconn);
4618         struct iscsi_conn *conn, *conn_tmp = NULL;
4619         int is_last;
4620
4621         spin_lock_bh(&sess->conn_lock);
4622         if (session_sleep)
4623                 atomic_set(&sess->sleep_on_sess_wait_comp, 1);
4624
4625         if (connection_sleep) {
4626                 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4627                                 conn_list) {
4628                         if (conn_count == 0)
4629                                 break;
4630
4631                         if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4632                                 is_last = 1;
4633                         } else {
4634                                 iscsit_inc_conn_usage_count(conn_tmp);
4635                                 is_last = 0;
4636                         }
4637                         iscsit_inc_conn_usage_count(conn);
4638
4639                         spin_unlock_bh(&sess->conn_lock);
4640                         iscsit_cause_connection_reinstatement(conn, 1);
4641                         spin_lock_bh(&sess->conn_lock);
4642
4643                         iscsit_dec_conn_usage_count(conn);
4644                         if (is_last == 0)
4645                                 iscsit_dec_conn_usage_count(conn_tmp);
4646                         conn_count--;
4647                 }
4648         } else {
4649                 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4650                         iscsit_cause_connection_reinstatement(conn, 0);
4651         }
4652
4653         if (session_sleep && atomic_read(&sess->nconn)) {
4654                 spin_unlock_bh(&sess->conn_lock);
4655                 wait_for_completion(&sess->session_wait_comp);
4656         } else
4657                 spin_unlock_bh(&sess->conn_lock);
4658 }
4659
4660 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4661 {
4662         struct iscsi_session *sess;
4663         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4664         struct se_session *se_sess, *se_sess_tmp;
4665         LIST_HEAD(free_list);
4666         int session_count = 0;
4667
4668         spin_lock_bh(&se_tpg->session_lock);
4669         if (tpg->nsessions && !force) {
4670                 spin_unlock_bh(&se_tpg->session_lock);
4671                 return -1;
4672         }
4673
4674         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4675                         sess_list) {
4676                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4677
4678                 spin_lock(&sess->conn_lock);
4679                 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4680                     atomic_read(&sess->session_logout) ||
4681                     (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4682                         spin_unlock(&sess->conn_lock);
4683                         continue;
4684                 }
4685                 atomic_set(&sess->session_reinstatement, 1);
4686                 spin_unlock(&sess->conn_lock);
4687
4688                 list_move_tail(&se_sess->sess_list, &free_list);
4689         }
4690         spin_unlock_bh(&se_tpg->session_lock);
4691
4692         list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
4693                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4694
4695                 iscsit_free_session(sess);
4696                 session_count++;
4697         }
4698
4699         pr_debug("Released %d iSCSI Session(s) from Target Portal"
4700                         " Group: %hu\n", session_count, tpg->tpgt);
4701         return 0;
4702 }
4703
4704 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4705 MODULE_VERSION("4.1.x");
4706 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4707 MODULE_LICENSE("GPL");
4708
4709 module_init(iscsi_target_init_module);
4710 module_exit(iscsi_target_cleanup_module);