drivers/target/iscsi/iscsi_target.c

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