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         atomic_inc(&np->np_reset_count);
 422
 423         if (np->np_thread) {
 424                 spin_unlock_bh(&np->np_thread_lock);
 425                 send_sig(SIGINT, np->np_thread, 1);
 426                 wait_for_completion(&np->np_restart_comp);
 427                 spin_lock_bh(&np->np_thread_lock);
 428         }
 429         spin_unlock_bh(&np->np_thread_lock);
 430
 431         if (tpg_np && shutdown) {
 432                 kref_put(&tpg_np->tpg_np_kref, iscsit_login_kref_put);
 433
 434                 wait_for_completion(&tpg_np->tpg_np_comp);
 435         }
 436
 437         return 0;
 438 }
 439
 440 static void iscsit_free_np(struct iscsi_np *np)
 441 {
 442         if (np->np_socket)
 443                 sock_release(np->np_socket);
 444 }
 445
 446 int iscsit_del_np(struct iscsi_np *np)
 447 {
 448         spin_lock_bh(&np->np_thread_lock);
 449         np->np_exports--;
 450         if (np->np_exports) {
 451                 np->enabled = true;
 452                 spin_unlock_bh(&np->np_thread_lock);
 453                 return 0;
 454         }
 455         np->np_thread_state = ISCSI_NP_THREAD_SHUTDOWN;
 456         spin_unlock_bh(&np->np_thread_lock);
 457
 458         if (np->np_thread) {
 459                 /*
 460                  * We need to send the signal to wakeup Linux/Net
 461                  * which may be sleeping in sock_accept()..
 462                  */
 463                 send_sig(SIGINT, np->np_thread, 1);
 464                 kthread_stop(np->np_thread);
 465                 np->np_thread = NULL;
 466         }
 467
 468         np->np_transport->iscsit_free_np(np);
 469
 470         mutex_lock(&np_lock);
 471         list_del(&np->np_list);
 472         mutex_unlock(&np_lock);
 473
 474         pr_debug("CORE[0] - Removed Network Portal: %pISpc on %s\n",
 475                 &np->np_sockaddr, np->np_transport->name);
 476
 477         iscsit_put_transport(np->np_transport);
 478         kfree(np);
 479         return 0;
 480 }
 481
 482 static void iscsit_get_rx_pdu(struct iscsi_conn *);
 483
 484 int iscsit_queue_rsp(struct iscsi_conn *conn, struct iscsi_cmd *cmd)
 485 {
 486         iscsit_add_cmd_to_response_queue(cmd, cmd->conn, cmd->i_state);
 487         return 0;
 488 }
 489 EXPORT_SYMBOL(iscsit_queue_rsp);
 490
 491 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 EXPORT_SYMBOL(iscsit_aborted_task);
 503
 504 static void iscsit_do_crypto_hash_buf(struct ahash_request *, const void *,
 505                                       u32, u32, u8 *, u8 *);
 506 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *);
 507
 508 static int
 509 iscsit_xmit_nondatain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 510                           const void *data_buf, u32 data_buf_len)
 511 {
 512         struct iscsi_hdr *hdr = (struct iscsi_hdr *)cmd->pdu;
 513         struct kvec *iov;
 514         u32 niov = 0, tx_size = ISCSI_HDR_LEN;
 515         int ret;
 516
 517         iov = &cmd->iov_misc[0];
 518         iov[niov].iov_base      = cmd->pdu;
 519         iov[niov++].iov_len     = ISCSI_HDR_LEN;
 520
 521         if (conn->conn_ops->HeaderDigest) {
 522                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
 523
 524                 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, hdr,
 525                                           ISCSI_HDR_LEN, 0, NULL,
 526                                           (u8 *)header_digest);
 527
 528                 iov[0].iov_len += ISCSI_CRC_LEN;
 529                 tx_size += ISCSI_CRC_LEN;
 530                 pr_debug("Attaching CRC32C HeaderDigest"
 531                          " to opcode 0x%x 0x%08x\n",
 532                          hdr->opcode, *header_digest);
 533         }
 534
 535         if (data_buf_len) {
 536                 u32 padding = ((-data_buf_len) & 3);
 537
 538                 iov[niov].iov_base      = (void *)data_buf;
 539                 iov[niov++].iov_len     = data_buf_len;
 540                 tx_size += data_buf_len;
 541
 542                 if (padding != 0) {
 543                         iov[niov].iov_base = &cmd->pad_bytes;
 544                         iov[niov++].iov_len = padding;
 545                         tx_size += padding;
 546                         pr_debug("Attaching %u additional"
 547                                  " padding bytes.\n", padding);
 548                 }
 549
 550                 if (conn->conn_ops->DataDigest) {
 551                         iscsit_do_crypto_hash_buf(conn->conn_tx_hash,
 552                                                   data_buf, data_buf_len,
 553                                                   padding,
 554                                                   (u8 *)&cmd->pad_bytes,
 555                                                   (u8 *)&cmd->data_crc);
 556
 557                         iov[niov].iov_base = &cmd->data_crc;
 558                         iov[niov++].iov_len = ISCSI_CRC_LEN;
 559                         tx_size += ISCSI_CRC_LEN;
 560                         pr_debug("Attached DataDigest for %u"
 561                                  " bytes opcode 0x%x, CRC 0x%08x\n",
 562                                  data_buf_len, hdr->opcode, cmd->data_crc);
 563                 }
 564         }
 565
 566         cmd->iov_misc_count = niov;
 567         cmd->tx_size = tx_size;
 568
 569         ret = iscsit_send_tx_data(cmd, conn, 1);
 570         if (ret < 0) {
 571                 iscsit_tx_thread_wait_for_tcp(conn);
 572                 return ret;
 573         }
 574
 575         return 0;
 576 }
 577
 578 static int iscsit_map_iovec(struct iscsi_cmd *, struct kvec *, u32, u32);
 579 static void iscsit_unmap_iovec(struct iscsi_cmd *);
 580 static u32 iscsit_do_crypto_hash_sg(struct ahash_request *, struct iscsi_cmd *,
 581                                     u32, u32, u32, u8 *);
 582 static int
 583 iscsit_xmit_datain_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 584                        const struct iscsi_datain *datain)
 585 {
 586         struct kvec *iov;
 587         u32 iov_count = 0, tx_size = 0;
 588         int ret, iov_ret;
 589
 590         iov = &cmd->iov_data[0];
 591         iov[iov_count].iov_base = cmd->pdu;
 592         iov[iov_count++].iov_len = ISCSI_HDR_LEN;
 593         tx_size += ISCSI_HDR_LEN;
 594
 595         if (conn->conn_ops->HeaderDigest) {
 596                 u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
 597
 598                 iscsit_do_crypto_hash_buf(conn->conn_tx_hash, cmd->pdu,
 599                                           ISCSI_HDR_LEN, 0, NULL,
 600                                           (u8 *)header_digest);
 601
 602                 iov[0].iov_len += ISCSI_CRC_LEN;
 603                 tx_size += ISCSI_CRC_LEN;
 604
 605                 pr_debug("Attaching CRC32 HeaderDigest for DataIN PDU 0x%08x\n",
 606                          *header_digest);
 607         }
 608
 609         iov_ret = iscsit_map_iovec(cmd, &cmd->iov_data[1],
 610                                    datain->offset, datain->length);
 611         if (iov_ret < 0)
 612                 return -1;
 613
 614         iov_count += iov_ret;
 615         tx_size += datain->length;
 616
 617         cmd->padding = ((-datain->length) & 3);
 618         if (cmd->padding) {
 619                 iov[iov_count].iov_base         = cmd->pad_bytes;
 620                 iov[iov_count++].iov_len        = cmd->padding;
 621                 tx_size += cmd->padding;
 622
 623                 pr_debug("Attaching %u padding bytes\n", cmd->padding);
 624         }
 625
 626         if (conn->conn_ops->DataDigest) {
 627                 cmd->data_crc = iscsit_do_crypto_hash_sg(conn->conn_tx_hash,
 628                                                          cmd, datain->offset,
 629                                                          datain->length,
 630                                                          cmd->padding,
 631                                                          cmd->pad_bytes);
 632
 633                 iov[iov_count].iov_base = &cmd->data_crc;
 634                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
 635                 tx_size += ISCSI_CRC_LEN;
 636
 637                 pr_debug("Attached CRC32C DataDigest %d bytes, crc 0x%08x\n",
 638                          datain->length + cmd->padding, cmd->data_crc);
 639         }
 640
 641         cmd->iov_data_count = iov_count;
 642         cmd->tx_size = tx_size;
 643
 644         ret = iscsit_fe_sendpage_sg(cmd, conn);
 645
 646         iscsit_unmap_iovec(cmd);
 647
 648         if (ret < 0) {
 649                 iscsit_tx_thread_wait_for_tcp(conn);
 650                 return ret;
 651         }
 652
 653         return 0;
 654 }
 655
 656 static int iscsit_xmit_pdu(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 657                            struct iscsi_datain_req *dr, const void *buf,
 658                            u32 buf_len)
 659 {
 660         if (dr)
 661                 return iscsit_xmit_datain_pdu(conn, cmd, buf);
 662         else
 663                 return iscsit_xmit_nondatain_pdu(conn, cmd, buf, buf_len);
 664 }
 665
 666 static enum target_prot_op iscsit_get_sup_prot_ops(struct iscsi_conn *conn)
 667 {
 668         return TARGET_PROT_NORMAL;
 669 }
 670
 671 static struct iscsit_transport iscsi_target_transport = {
 672         .name                   = "iSCSI/TCP",
 673         .transport_type         = ISCSI_TCP,
 674         .rdma_shutdown          = false,
 675         .owner                  = NULL,
 676         .iscsit_setup_np        = iscsit_setup_np,
 677         .iscsit_accept_np       = iscsit_accept_np,
 678         .iscsit_free_np         = iscsit_free_np,
 679         .iscsit_get_login_rx    = iscsit_get_login_rx,
 680         .iscsit_put_login_tx    = iscsit_put_login_tx,
 681         .iscsit_get_dataout     = iscsit_build_r2ts_for_cmd,
 682         .iscsit_immediate_queue = iscsit_immediate_queue,
 683         .iscsit_response_queue  = iscsit_response_queue,
 684         .iscsit_queue_data_in   = iscsit_queue_rsp,
 685         .iscsit_queue_status    = iscsit_queue_rsp,
 686         .iscsit_aborted_task    = iscsit_aborted_task,
 687         .iscsit_xmit_pdu        = iscsit_xmit_pdu,
 688         .iscsit_get_rx_pdu      = iscsit_get_rx_pdu,
 689         .iscsit_get_sup_prot_ops = iscsit_get_sup_prot_ops,
 690 };
 691
 692 static int __init iscsi_target_init_module(void)
 693 {
 694         int ret = 0, size;
 695
 696         pr_debug("iSCSI-Target "ISCSIT_VERSION"\n");
 697
 698         iscsit_global = kzalloc(sizeof(struct iscsit_global), GFP_KERNEL);
 699         if (!iscsit_global) {
 700                 pr_err("Unable to allocate memory for iscsit_global\n");
 701                 return -1;
 702         }
 703         spin_lock_init(&iscsit_global->ts_bitmap_lock);
 704         mutex_init(&auth_id_lock);
 705         spin_lock_init(&sess_idr_lock);
 706         idr_init(&tiqn_idr);
 707         idr_init(&sess_idr);
 708
 709         ret = target_register_template(&iscsi_ops);
 710         if (ret)
 711                 goto out;
 712
 713         size = BITS_TO_LONGS(ISCSIT_BITMAP_BITS) * sizeof(long);
 714         iscsit_global->ts_bitmap = vzalloc(size);
 715         if (!iscsit_global->ts_bitmap) {
 716                 pr_err("Unable to allocate iscsit_global->ts_bitmap\n");
 717                 goto configfs_out;
 718         }
 719
 720         lio_qr_cache = kmem_cache_create("lio_qr_cache",
 721                         sizeof(struct iscsi_queue_req),
 722                         __alignof__(struct iscsi_queue_req), 0, NULL);
 723         if (!lio_qr_cache) {
 724                 pr_err("nable to kmem_cache_create() for"
 725                                 " lio_qr_cache\n");
 726                 goto bitmap_out;
 727         }
 728
 729         lio_dr_cache = kmem_cache_create("lio_dr_cache",
 730                         sizeof(struct iscsi_datain_req),
 731                         __alignof__(struct iscsi_datain_req), 0, NULL);
 732         if (!lio_dr_cache) {
 733                 pr_err("Unable to kmem_cache_create() for"
 734                                 " lio_dr_cache\n");
 735                 goto qr_out;
 736         }
 737
 738         lio_ooo_cache = kmem_cache_create("lio_ooo_cache",
 739                         sizeof(struct iscsi_ooo_cmdsn),
 740                         __alignof__(struct iscsi_ooo_cmdsn), 0, NULL);
 741         if (!lio_ooo_cache) {
 742                 pr_err("Unable to kmem_cache_create() for"
 743                                 " lio_ooo_cache\n");
 744                 goto dr_out;
 745         }
 746
 747         lio_r2t_cache = kmem_cache_create("lio_r2t_cache",
 748                         sizeof(struct iscsi_r2t), __alignof__(struct iscsi_r2t),
 749                         0, NULL);
 750         if (!lio_r2t_cache) {
 751                 pr_err("Unable to kmem_cache_create() for"
 752                                 " lio_r2t_cache\n");
 753                 goto ooo_out;
 754         }
 755
 756         iscsit_register_transport(&iscsi_target_transport);
 757
 758         if (iscsit_load_discovery_tpg() < 0)
 759                 goto r2t_out;
 760
 761         return ret;
 762 r2t_out:
 763         iscsit_unregister_transport(&iscsi_target_transport);
 764         kmem_cache_destroy(lio_r2t_cache);
 765 ooo_out:
 766         kmem_cache_destroy(lio_ooo_cache);
 767 dr_out:
 768         kmem_cache_destroy(lio_dr_cache);
 769 qr_out:
 770         kmem_cache_destroy(lio_qr_cache);
 771 bitmap_out:
 772         vfree(iscsit_global->ts_bitmap);
 773 configfs_out:
 774         /* XXX: this probably wants it to be it's own unwind step.. */
 775         if (iscsit_global->discovery_tpg)
 776                 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
 777         target_unregister_template(&iscsi_ops);
 778 out:
 779         kfree(iscsit_global);
 780         return -ENOMEM;
 781 }
 782
 783 static void __exit iscsi_target_cleanup_module(void)
 784 {
 785         iscsit_release_discovery_tpg();
 786         iscsit_unregister_transport(&iscsi_target_transport);
 787         kmem_cache_destroy(lio_qr_cache);
 788         kmem_cache_destroy(lio_dr_cache);
 789         kmem_cache_destroy(lio_ooo_cache);
 790         kmem_cache_destroy(lio_r2t_cache);
 791
 792         /*
 793          * Shutdown discovery sessions and disable discovery TPG
 794          */
 795         if (iscsit_global->discovery_tpg)
 796                 iscsit_tpg_disable_portal_group(iscsit_global->discovery_tpg, 1);
 797
 798         target_unregister_template(&iscsi_ops);
 799
 800         vfree(iscsit_global->ts_bitmap);
 801         kfree(iscsit_global);
 802 }
 803
 804 int iscsit_add_reject(
 805         struct iscsi_conn *conn,
 806         u8 reason,
 807         unsigned char *buf)
 808 {
 809         struct iscsi_cmd *cmd;
 810
 811         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
 812         if (!cmd)
 813                 return -1;
 814
 815         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 816         cmd->reject_reason = reason;
 817
 818         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 819         if (!cmd->buf_ptr) {
 820                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 821                 iscsit_free_cmd(cmd, false);
 822                 return -1;
 823         }
 824
 825         spin_lock_bh(&conn->cmd_lock);
 826         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 827         spin_unlock_bh(&conn->cmd_lock);
 828
 829         cmd->i_state = ISTATE_SEND_REJECT;
 830         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 831
 832         return -1;
 833 }
 834 EXPORT_SYMBOL(iscsit_add_reject);
 835
 836 static int iscsit_add_reject_from_cmd(
 837         struct iscsi_cmd *cmd,
 838         u8 reason,
 839         bool add_to_conn,
 840         unsigned char *buf)
 841 {
 842         struct iscsi_conn *conn;
 843         const bool do_put = cmd->se_cmd.se_tfo != NULL;
 844
 845         if (!cmd->conn) {
 846                 pr_err("cmd->conn is NULL for ITT: 0x%08x\n",
 847                                 cmd->init_task_tag);
 848                 return -1;
 849         }
 850         conn = cmd->conn;
 851
 852         cmd->iscsi_opcode = ISCSI_OP_REJECT;
 853         cmd->reject_reason = reason;
 854
 855         cmd->buf_ptr = kmemdup(buf, ISCSI_HDR_LEN, GFP_KERNEL);
 856         if (!cmd->buf_ptr) {
 857                 pr_err("Unable to allocate memory for cmd->buf_ptr\n");
 858                 iscsit_free_cmd(cmd, false);
 859                 return -1;
 860         }
 861
 862         if (add_to_conn) {
 863                 spin_lock_bh(&conn->cmd_lock);
 864                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
 865                 spin_unlock_bh(&conn->cmd_lock);
 866         }
 867
 868         cmd->i_state = ISTATE_SEND_REJECT;
 869         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
 870         /*
 871          * Perform the kref_put now if se_cmd has already been setup by
 872          * scsit_setup_scsi_cmd()
 873          */
 874         if (do_put) {
 875                 pr_debug("iscsi reject: calling target_put_sess_cmd >>>>>>\n");
 876                 target_put_sess_cmd(&cmd->se_cmd);
 877         }
 878         return -1;
 879 }
 880
 881 static int iscsit_add_reject_cmd(struct iscsi_cmd *cmd, u8 reason,
 882                                  unsigned char *buf)
 883 {
 884         return iscsit_add_reject_from_cmd(cmd, reason, true, buf);
 885 }
 886
 887 int iscsit_reject_cmd(struct iscsi_cmd *cmd, u8 reason, unsigned char *buf)
 888 {
 889         return iscsit_add_reject_from_cmd(cmd, reason, false, buf);
 890 }
 891 EXPORT_SYMBOL(iscsit_reject_cmd);
 892
 893 /*
 894  * Map some portion of the allocated scatterlist to an iovec, suitable for
 895  * kernel sockets to copy data in/out.
 896  */
 897 static int iscsit_map_iovec(
 898         struct iscsi_cmd *cmd,
 899         struct kvec *iov,
 900         u32 data_offset,
 901         u32 data_length)
 902 {
 903         u32 i = 0;
 904         struct scatterlist *sg;
 905         unsigned int page_off;
 906
 907         /*
 908          * We know each entry in t_data_sg contains a page.
 909          */
 910         u32 ent = data_offset / PAGE_SIZE;
 911
 912         if (ent >= cmd->se_cmd.t_data_nents) {
 913                 pr_err("Initial page entry out-of-bounds\n");
 914                 return -1;
 915         }
 916
 917         sg = &cmd->se_cmd.t_data_sg[ent];
 918         page_off = (data_offset % PAGE_SIZE);
 919
 920         cmd->first_data_sg = sg;
 921         cmd->first_data_sg_off = page_off;
 922
 923         while (data_length) {
 924                 u32 cur_len = min_t(u32, data_length, sg->length - page_off);
 925
 926                 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset + page_off;
 927                 iov[i].iov_len = cur_len;
 928
 929                 data_length -= cur_len;
 930                 page_off = 0;
 931                 sg = sg_next(sg);
 932                 i++;
 933         }
 934
 935         cmd->kmapped_nents = i;
 936
 937         return i;
 938 }
 939
 940 static void iscsit_unmap_iovec(struct iscsi_cmd *cmd)
 941 {
 942         u32 i;
 943         struct scatterlist *sg;
 944
 945         sg = cmd->first_data_sg;
 946
 947         for (i = 0; i < cmd->kmapped_nents; i++)
 948                 kunmap(sg_page(&sg[i]));
 949 }
 950
 951 static void iscsit_ack_from_expstatsn(struct iscsi_conn *conn, u32 exp_statsn)
 952 {
 953         LIST_HEAD(ack_list);
 954         struct iscsi_cmd *cmd, *cmd_p;
 955
 956         conn->exp_statsn = exp_statsn;
 957
 958         if (conn->sess->sess_ops->RDMAExtensions)
 959                 return;
 960
 961         spin_lock_bh(&conn->cmd_lock);
 962         list_for_each_entry_safe(cmd, cmd_p, &conn->conn_cmd_list, i_conn_node) {
 963                 spin_lock(&cmd->istate_lock);
 964                 if ((cmd->i_state == ISTATE_SENT_STATUS) &&
 965                     iscsi_sna_lt(cmd->stat_sn, exp_statsn)) {
 966                         cmd->i_state = ISTATE_REMOVE;
 967                         spin_unlock(&cmd->istate_lock);
 968                         list_move_tail(&cmd->i_conn_node, &ack_list);
 969                         continue;
 970                 }
 971                 spin_unlock(&cmd->istate_lock);
 972         }
 973         spin_unlock_bh(&conn->cmd_lock);
 974
 975         list_for_each_entry_safe(cmd, cmd_p, &ack_list, i_conn_node) {
 976                 list_del_init(&cmd->i_conn_node);
 977                 iscsit_free_cmd(cmd, false);
 978         }
 979 }
 980
 981 static int iscsit_allocate_iovecs(struct iscsi_cmd *cmd)
 982 {
 983         u32 iov_count = max(1UL, DIV_ROUND_UP(cmd->se_cmd.data_length, PAGE_SIZE));
 984
 985         iov_count += ISCSI_IOV_DATA_BUFFER;
 986
 987         cmd->iov_data = kzalloc(iov_count * sizeof(struct kvec), GFP_KERNEL);
 988         if (!cmd->iov_data) {
 989                 pr_err("Unable to allocate cmd->iov_data\n");
 990                 return -ENOMEM;
 991         }
 992
 993         cmd->orig_iov_data_count = iov_count;
 994         return 0;
 995 }
 996
 997 int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
 998                           unsigned char *buf)
 999 {
1000         int data_direction, payload_length;
1001         struct iscsi_scsi_req *hdr;
1002         int iscsi_task_attr;
1003         int sam_task_attr;
1004
1005         atomic_long_inc(&conn->sess->cmd_pdus);
1006
1007         hdr                     = (struct iscsi_scsi_req *) buf;
1008         payload_length          = ntoh24(hdr->dlength);
1009
1010         /* FIXME; Add checks for AdditionalHeaderSegment */
1011
1012         if (!(hdr->flags & ISCSI_FLAG_CMD_WRITE) &&
1013             !(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1014                 pr_err("ISCSI_FLAG_CMD_WRITE & ISCSI_FLAG_CMD_FINAL"
1015                                 " not set. Bad iSCSI Initiator.\n");
1016                 return iscsit_add_reject_cmd(cmd,
1017                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1018         }
1019
1020         if (((hdr->flags & ISCSI_FLAG_CMD_READ) ||
1021              (hdr->flags & ISCSI_FLAG_CMD_WRITE)) && !hdr->data_length) {
1022                 /*
1023                  * From RFC-3720 Section 10.3.1:
1024                  *
1025                  * "Either or both of R and W MAY be 1 when either the
1026                  *  Expected Data Transfer Length and/or Bidirectional Read
1027                  *  Expected Data Transfer Length are 0"
1028                  *
1029                  * For this case, go ahead and clear the unnecssary bits
1030                  * to avoid any confusion with ->data_direction.
1031                  */
1032                 hdr->flags &= ~ISCSI_FLAG_CMD_READ;
1033                 hdr->flags &= ~ISCSI_FLAG_CMD_WRITE;
1034
1035                 pr_warn("ISCSI_FLAG_CMD_READ or ISCSI_FLAG_CMD_WRITE"
1036                         " set when Expected Data Transfer Length is 0 for"
1037                         " CDB: 0x%02x, Fixing up flags\n", hdr->cdb[0]);
1038         }
1039
1040         if (!(hdr->flags & ISCSI_FLAG_CMD_READ) &&
1041             !(hdr->flags & ISCSI_FLAG_CMD_WRITE) && (hdr->data_length != 0)) {
1042                 pr_err("ISCSI_FLAG_CMD_READ and/or ISCSI_FLAG_CMD_WRITE"
1043                         " MUST be set if Expected Data Transfer Length is not 0."
1044                         " Bad iSCSI Initiator\n");
1045                 return iscsit_add_reject_cmd(cmd,
1046                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1047         }
1048
1049         if ((hdr->flags & ISCSI_FLAG_CMD_READ) &&
1050             (hdr->flags & ISCSI_FLAG_CMD_WRITE)) {
1051                 pr_err("Bidirectional operations not supported!\n");
1052                 return iscsit_add_reject_cmd(cmd,
1053                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1054         }
1055
1056         if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1057                 pr_err("Illegally set Immediate Bit in iSCSI Initiator"
1058                                 " Scsi Command PDU.\n");
1059                 return iscsit_add_reject_cmd(cmd,
1060                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1061         }
1062
1063         if (payload_length && !conn->sess->sess_ops->ImmediateData) {
1064                 pr_err("ImmediateData=No but DataSegmentLength=%u,"
1065                         " protocol error.\n", payload_length);
1066                 return iscsit_add_reject_cmd(cmd,
1067                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1068         }
1069
1070         if ((be32_to_cpu(hdr->data_length) == payload_length) &&
1071             (!(hdr->flags & ISCSI_FLAG_CMD_FINAL))) {
1072                 pr_err("Expected Data Transfer Length and Length of"
1073                         " Immediate Data are the same, but ISCSI_FLAG_CMD_FINAL"
1074                         " bit is not set protocol error\n");
1075                 return iscsit_add_reject_cmd(cmd,
1076                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1077         }
1078
1079         if (payload_length > be32_to_cpu(hdr->data_length)) {
1080                 pr_err("DataSegmentLength: %u is greater than"
1081                         " EDTL: %u, protocol error.\n", payload_length,
1082                                 hdr->data_length);
1083                 return iscsit_add_reject_cmd(cmd,
1084                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1085         }
1086
1087         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1088                 pr_err("DataSegmentLength: %u is greater than"
1089                         " MaxXmitDataSegmentLength: %u, protocol error.\n",
1090                         payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
1091                 return iscsit_add_reject_cmd(cmd,
1092                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1093         }
1094
1095         if (payload_length > conn->sess->sess_ops->FirstBurstLength) {
1096                 pr_err("DataSegmentLength: %u is greater than"
1097                         " FirstBurstLength: %u, protocol error.\n",
1098                         payload_length, conn->sess->sess_ops->FirstBurstLength);
1099                 return iscsit_add_reject_cmd(cmd,
1100                                              ISCSI_REASON_BOOKMARK_INVALID, buf);
1101         }
1102
1103         data_direction = (hdr->flags & ISCSI_FLAG_CMD_WRITE) ? DMA_TO_DEVICE :
1104                          (hdr->flags & ISCSI_FLAG_CMD_READ) ? DMA_FROM_DEVICE :
1105                           DMA_NONE;
1106
1107         cmd->data_direction = data_direction;
1108         iscsi_task_attr = hdr->flags & ISCSI_FLAG_CMD_ATTR_MASK;
1109         /*
1110          * Figure out the SAM Task Attribute for the incoming SCSI CDB
1111          */
1112         if ((iscsi_task_attr == ISCSI_ATTR_UNTAGGED) ||
1113             (iscsi_task_attr == ISCSI_ATTR_SIMPLE))
1114                 sam_task_attr = TCM_SIMPLE_TAG;
1115         else if (iscsi_task_attr == ISCSI_ATTR_ORDERED)
1116                 sam_task_attr = TCM_ORDERED_TAG;
1117         else if (iscsi_task_attr == ISCSI_ATTR_HEAD_OF_QUEUE)
1118                 sam_task_attr = TCM_HEAD_TAG;
1119         else if (iscsi_task_attr == ISCSI_ATTR_ACA)
1120                 sam_task_attr = TCM_ACA_TAG;
1121         else {
1122                 pr_debug("Unknown iSCSI Task Attribute: 0x%02x, using"
1123                         " TCM_SIMPLE_TAG\n", iscsi_task_attr);
1124                 sam_task_attr = TCM_SIMPLE_TAG;
1125         }
1126
1127         cmd->iscsi_opcode       = ISCSI_OP_SCSI_CMD;
1128         cmd->i_state            = ISTATE_NEW_CMD;
1129         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
1130         cmd->immediate_data     = (payload_length) ? 1 : 0;
1131         cmd->unsolicited_data   = ((!(hdr->flags & ISCSI_FLAG_CMD_FINAL) &&
1132                                      (hdr->flags & ISCSI_FLAG_CMD_WRITE)) ? 1 : 0);
1133         if (cmd->unsolicited_data)
1134                 cmd->cmd_flags |= ICF_NON_IMMEDIATE_UNSOLICITED_DATA;
1135
1136         conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1137         if (hdr->flags & ISCSI_FLAG_CMD_READ)
1138                 cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
1139         else
1140                 cmd->targ_xfer_tag = 0xFFFFFFFF;
1141         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1142         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1143         cmd->first_burst_len    = payload_length;
1144
1145         if (!conn->sess->sess_ops->RDMAExtensions &&
1146              cmd->data_direction == DMA_FROM_DEVICE) {
1147                 struct iscsi_datain_req *dr;
1148
1149                 dr = iscsit_allocate_datain_req();
1150                 if (!dr)
1151                         return iscsit_add_reject_cmd(cmd,
1152                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1153
1154                 iscsit_attach_datain_req(cmd, dr);
1155         }
1156
1157         /*
1158          * Initialize struct se_cmd descriptor from target_core_mod infrastructure
1159          */
1160         transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1161                         conn->sess->se_sess, be32_to_cpu(hdr->data_length),
1162                         cmd->data_direction, sam_task_attr,
1163                         cmd->sense_buffer + 2);
1164
1165         pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x,"
1166                 " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt,
1167                 hdr->cmdsn, be32_to_cpu(hdr->data_length), payload_length,
1168                 conn->cid);
1169
1170         target_get_sess_cmd(&cmd->se_cmd, true);
1171
1172         cmd->sense_reason = transport_lookup_cmd_lun(&cmd->se_cmd,
1173                                                      scsilun_to_int(&hdr->lun));
1174         if (cmd->sense_reason)
1175                 goto attach_cmd;
1176
1177         /* only used for printks or comparing with ->ref_task_tag */
1178         cmd->se_cmd.tag = (__force u32)cmd->init_task_tag;
1179         cmd->sense_reason = target_setup_cmd_from_cdb(&cmd->se_cmd, hdr->cdb);
1180         if (cmd->sense_reason) {
1181                 if (cmd->sense_reason == TCM_OUT_OF_RESOURCES) {
1182                         return iscsit_add_reject_cmd(cmd,
1183                                         ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1184                 }
1185
1186                 goto attach_cmd;
1187         }
1188
1189         if (iscsit_build_pdu_and_seq_lists(cmd, payload_length) < 0) {
1190                 return iscsit_add_reject_cmd(cmd,
1191                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1192         }
1193
1194 attach_cmd:
1195         spin_lock_bh(&conn->cmd_lock);
1196         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1197         spin_unlock_bh(&conn->cmd_lock);
1198         /*
1199          * Check if we need to delay processing because of ALUA
1200          * Active/NonOptimized primary access state..
1201          */
1202         core_alua_check_nonop_delay(&cmd->se_cmd);
1203
1204         return 0;
1205 }
1206 EXPORT_SYMBOL(iscsit_setup_scsi_cmd);
1207
1208 void iscsit_set_unsoliticed_dataout(struct iscsi_cmd *cmd)
1209 {
1210         iscsit_set_dataout_sequence_values(cmd);
1211
1212         spin_lock_bh(&cmd->dataout_timeout_lock);
1213         iscsit_start_dataout_timer(cmd, cmd->conn);
1214         spin_unlock_bh(&cmd->dataout_timeout_lock);
1215 }
1216 EXPORT_SYMBOL(iscsit_set_unsoliticed_dataout);
1217
1218 int iscsit_process_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1219                             struct iscsi_scsi_req *hdr)
1220 {
1221         int cmdsn_ret = 0;
1222         /*
1223          * Check the CmdSN against ExpCmdSN/MaxCmdSN here if
1224          * the Immediate Bit is not set, and no Immediate
1225          * Data is attached.
1226          *
1227          * A PDU/CmdSN carrying Immediate Data can only
1228          * be processed after the DataCRC has passed.
1229          * If the DataCRC fails, the CmdSN MUST NOT
1230          * be acknowledged. (See below)
1231          */
1232         if (!cmd->immediate_data) {
1233                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1234                                         (unsigned char *)hdr, hdr->cmdsn);
1235                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1236                         return -1;
1237                 else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1238                         target_put_sess_cmd(&cmd->se_cmd);
1239                         return 0;
1240                 }
1241         }
1242
1243         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1244
1245         /*
1246          * If no Immediate Data is attached, it's OK to return now.
1247          */
1248         if (!cmd->immediate_data) {
1249                 if (!cmd->sense_reason && cmd->unsolicited_data)
1250                         iscsit_set_unsoliticed_dataout(cmd);
1251                 if (!cmd->sense_reason)
1252                         return 0;
1253
1254                 target_put_sess_cmd(&cmd->se_cmd);
1255                 return 0;
1256         }
1257
1258         /*
1259          * Early CHECK_CONDITIONs with ImmediateData never make it to command
1260          * execution.  These exceptions are processed in CmdSN order using
1261          * iscsit_check_received_cmdsn() in iscsit_get_immediate_data() below.
1262          */
1263         if (cmd->sense_reason) {
1264                 if (cmd->reject_reason)
1265                         return 0;
1266
1267                 return 1;
1268         }
1269         /*
1270          * Call directly into transport_generic_new_cmd() to perform
1271          * the backend memory allocation.
1272          */
1273         cmd->sense_reason = transport_generic_new_cmd(&cmd->se_cmd);
1274         if (cmd->sense_reason)
1275                 return 1;
1276
1277         return 0;
1278 }
1279 EXPORT_SYMBOL(iscsit_process_scsi_cmd);
1280
1281 static int
1282 iscsit_get_immediate_data(struct iscsi_cmd *cmd, struct iscsi_scsi_req *hdr,
1283                           bool dump_payload)
1284 {
1285         int cmdsn_ret = 0, immed_ret = IMMEDIATE_DATA_NORMAL_OPERATION;
1286         /*
1287          * Special case for Unsupported SAM WRITE Opcodes and ImmediateData=Yes.
1288          */
1289         if (dump_payload)
1290                 goto after_immediate_data;
1291         /*
1292          * Check for underflow case where both EDTL and immediate data payload
1293          * exceeds what is presented by CDB's TRANSFER LENGTH, and what has
1294          * already been set in target_cmd_size_check() as se_cmd->data_length.
1295          *
1296          * For this special case, fail the command and dump the immediate data
1297          * payload.
1298          */
1299         if (cmd->first_burst_len > cmd->se_cmd.data_length) {
1300                 cmd->sense_reason = TCM_INVALID_CDB_FIELD;
1301                 goto after_immediate_data;
1302         }
1303
1304         immed_ret = iscsit_handle_immediate_data(cmd, hdr,
1305                                         cmd->first_burst_len);
1306 after_immediate_data:
1307         if (immed_ret == IMMEDIATE_DATA_NORMAL_OPERATION) {
1308                 /*
1309                  * A PDU/CmdSN carrying Immediate Data passed
1310                  * DataCRC, check against ExpCmdSN/MaxCmdSN if
1311                  * Immediate Bit is not set.
1312                  */
1313                 cmdsn_ret = iscsit_sequence_cmd(cmd->conn, cmd,
1314                                         (unsigned char *)hdr, hdr->cmdsn);
1315                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1316                         return -1;
1317
1318                 if (cmd->sense_reason || cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
1319                         int rc;
1320
1321                         rc = iscsit_dump_data_payload(cmd->conn,
1322                                                       cmd->first_burst_len, 1);
1323                         target_put_sess_cmd(&cmd->se_cmd);
1324                         return rc;
1325                 } else if (cmd->unsolicited_data)
1326                         iscsit_set_unsoliticed_dataout(cmd);
1327
1328         } else if (immed_ret == IMMEDIATE_DATA_ERL1_CRC_FAILURE) {
1329                 /*
1330                  * Immediate Data failed DataCRC and ERL>=1,
1331                  * silently drop this PDU and let the initiator
1332                  * plug the CmdSN gap.
1333                  *
1334                  * FIXME: Send Unsolicited NOPIN with reserved
1335                  * TTT here to help the initiator figure out
1336                  * the missing CmdSN, although they should be
1337                  * intelligent enough to determine the missing
1338                  * CmdSN and issue a retry to plug the sequence.
1339                  */
1340                 cmd->i_state = ISTATE_REMOVE;
1341                 iscsit_add_cmd_to_immediate_queue(cmd, cmd->conn, cmd->i_state);
1342         } else /* immed_ret == IMMEDIATE_DATA_CANNOT_RECOVER */
1343                 return -1;
1344
1345         return 0;
1346 }
1347
1348 static int
1349 iscsit_handle_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1350                            unsigned char *buf)
1351 {
1352         struct iscsi_scsi_req *hdr = (struct iscsi_scsi_req *)buf;
1353         int rc, immed_data;
1354         bool dump_payload = false;
1355
1356         rc = iscsit_setup_scsi_cmd(conn, cmd, buf);
1357         if (rc < 0)
1358                 return 0;
1359         /*
1360          * Allocation iovecs needed for struct socket operations for
1361          * traditional iSCSI block I/O.
1362          */
1363         if (iscsit_allocate_iovecs(cmd) < 0) {
1364                 return iscsit_reject_cmd(cmd,
1365                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
1366         }
1367         immed_data = cmd->immediate_data;
1368
1369         rc = iscsit_process_scsi_cmd(conn, cmd, hdr);
1370         if (rc < 0)
1371                 return rc;
1372         else if (rc > 0)
1373                 dump_payload = true;
1374
1375         if (!immed_data)
1376                 return 0;
1377
1378         return iscsit_get_immediate_data(cmd, hdr, dump_payload);
1379 }
1380
1381 static u32 iscsit_do_crypto_hash_sg(
1382         struct ahash_request *hash,
1383         struct iscsi_cmd *cmd,
1384         u32 data_offset,
1385         u32 data_length,
1386         u32 padding,
1387         u8 *pad_bytes)
1388 {
1389         u32 data_crc;
1390         struct scatterlist *sg;
1391         unsigned int page_off;
1392
1393         crypto_ahash_init(hash);
1394
1395         sg = cmd->first_data_sg;
1396         page_off = cmd->first_data_sg_off;
1397
1398         if (data_length && page_off) {
1399                 struct scatterlist first_sg;
1400                 u32 len = min_t(u32, data_length, sg->length - page_off);
1401
1402                 sg_init_table(&first_sg, 1);
1403                 sg_set_page(&first_sg, sg_page(sg), len, sg->offset + page_off);
1404
1405                 ahash_request_set_crypt(hash, &first_sg, NULL, len);
1406                 crypto_ahash_update(hash);
1407
1408                 data_length -= len;
1409                 sg = sg_next(sg);
1410         }
1411
1412         while (data_length) {
1413                 u32 cur_len = min_t(u32, data_length, sg->length);
1414
1415                 ahash_request_set_crypt(hash, sg, NULL, cur_len);
1416                 crypto_ahash_update(hash);
1417
1418                 data_length -= cur_len;
1419                 /* iscsit_map_iovec has already checked for invalid sg pointers */
1420                 sg = sg_next(sg);
1421         }
1422
1423         if (padding) {
1424                 struct scatterlist pad_sg;
1425
1426                 sg_init_one(&pad_sg, pad_bytes, padding);
1427                 ahash_request_set_crypt(hash, &pad_sg, (u8 *)&data_crc,
1428                                         padding);
1429                 crypto_ahash_finup(hash);
1430         } else {
1431                 ahash_request_set_crypt(hash, NULL, (u8 *)&data_crc, 0);
1432                 crypto_ahash_final(hash);
1433         }
1434
1435         return data_crc;
1436 }
1437
1438 static void iscsit_do_crypto_hash_buf(
1439         struct ahash_request *hash,
1440         const void *buf,
1441         u32 payload_length,
1442         u32 padding,
1443         u8 *pad_bytes,
1444         u8 *data_crc)
1445 {
1446         struct scatterlist sg[2];
1447
1448         sg_init_table(sg, ARRAY_SIZE(sg));
1449         sg_set_buf(sg, buf, payload_length);
1450         if (padding)
1451                 sg_set_buf(sg + 1, pad_bytes, padding);
1452
1453         ahash_request_set_crypt(hash, sg, data_crc, payload_length + padding);
1454
1455         crypto_ahash_digest(hash);
1456 }
1457
1458 int
1459 iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf,
1460                           struct iscsi_cmd **out_cmd)
1461 {
1462         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1463         struct iscsi_cmd *cmd = NULL;
1464         struct se_cmd *se_cmd;
1465         u32 payload_length = ntoh24(hdr->dlength);
1466         int rc;
1467
1468         if (!payload_length) {
1469                 pr_warn("DataOUT payload is ZERO, ignoring.\n");
1470                 return 0;
1471         }
1472
1473         /* iSCSI write */
1474         atomic_long_add(payload_length, &conn->sess->rx_data_octets);
1475
1476         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1477                 pr_err("DataSegmentLength: %u is greater than"
1478                         " MaxXmitDataSegmentLength: %u\n", payload_length,
1479                         conn->conn_ops->MaxXmitDataSegmentLength);
1480                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1481                                          buf);
1482         }
1483
1484         cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
1485                         payload_length);
1486         if (!cmd)
1487                 return 0;
1488
1489         pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
1490                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
1491                 hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
1492                 payload_length, conn->cid);
1493
1494         if (cmd->cmd_flags & ICF_GOT_LAST_DATAOUT) {
1495                 pr_err("Command ITT: 0x%08x received DataOUT after"
1496                         " last DataOUT received, dumping payload\n",
1497                         cmd->init_task_tag);
1498                 return iscsit_dump_data_payload(conn, payload_length, 1);
1499         }
1500
1501         if (cmd->data_direction != DMA_TO_DEVICE) {
1502                 pr_err("Command ITT: 0x%08x received DataOUT for a"
1503                         " NON-WRITE command.\n", cmd->init_task_tag);
1504                 return iscsit_dump_data_payload(conn, payload_length, 1);
1505         }
1506         se_cmd = &cmd->se_cmd;
1507         iscsit_mod_dataout_timer(cmd);
1508
1509         if ((be32_to_cpu(hdr->offset) + payload_length) > cmd->se_cmd.data_length) {
1510                 pr_err("DataOut Offset: %u, Length %u greater than"
1511                         " iSCSI Command EDTL %u, protocol error.\n",
1512                         hdr->offset, payload_length, cmd->se_cmd.data_length);
1513                 return iscsit_reject_cmd(cmd, ISCSI_REASON_BOOKMARK_INVALID, buf);
1514         }
1515
1516         if (cmd->unsolicited_data) {
1517                 int dump_unsolicited_data = 0;
1518
1519                 if (conn->sess->sess_ops->InitialR2T) {
1520                         pr_err("Received unexpected unsolicited data"
1521                                 " while InitialR2T=Yes, protocol error.\n");
1522                         transport_send_check_condition_and_sense(&cmd->se_cmd,
1523                                         TCM_UNEXPECTED_UNSOLICITED_DATA, 0);
1524                         return -1;
1525                 }
1526                 /*
1527                  * Special case for dealing with Unsolicited DataOUT
1528                  * and Unsupported SAM WRITE Opcodes and SE resource allocation
1529                  * failures;
1530                  */
1531
1532                 /* Something's amiss if we're not in WRITE_PENDING state... */
1533                 WARN_ON(se_cmd->t_state != TRANSPORT_WRITE_PENDING);
1534                 if (!(se_cmd->se_cmd_flags & SCF_SUPPORTED_SAM_OPCODE))
1535                         dump_unsolicited_data = 1;
1536
1537                 if (dump_unsolicited_data) {
1538                         /*
1539                          * Check if a delayed TASK_ABORTED status needs to
1540                          * be sent now if the ISCSI_FLAG_CMD_FINAL has been
1541                          * received with the unsolicited data out.
1542                          */
1543                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1544                                 iscsit_stop_dataout_timer(cmd);
1545
1546                         transport_check_aborted_status(se_cmd,
1547                                         (hdr->flags & ISCSI_FLAG_CMD_FINAL));
1548                         return iscsit_dump_data_payload(conn, payload_length, 1);
1549                 }
1550         } else {
1551                 /*
1552                  * For the normal solicited data path:
1553                  *
1554                  * Check for a delayed TASK_ABORTED status and dump any
1555                  * incoming data out payload if one exists.  Also, when the
1556                  * ISCSI_FLAG_CMD_FINAL is set to denote the end of the current
1557                  * data out sequence, we decrement outstanding_r2ts.  Once
1558                  * outstanding_r2ts reaches zero, go ahead and send the delayed
1559                  * TASK_ABORTED status.
1560                  */
1561                 if (se_cmd->transport_state & CMD_T_ABORTED) {
1562                         if (hdr->flags & ISCSI_FLAG_CMD_FINAL)
1563                                 if (--cmd->outstanding_r2ts < 1) {
1564                                         iscsit_stop_dataout_timer(cmd);
1565                                         transport_check_aborted_status(
1566                                                         se_cmd, 1);
1567                                 }
1568
1569                         return iscsit_dump_data_payload(conn, payload_length, 1);
1570                 }
1571         }
1572         /*
1573          * Preform DataSN, DataSequenceInOrder, DataPDUInOrder, and
1574          * within-command recovery checks before receiving the payload.
1575          */
1576         rc = iscsit_check_pre_dataout(cmd, buf);
1577         if (rc == DATAOUT_WITHIN_COMMAND_RECOVERY)
1578                 return 0;
1579         else if (rc == DATAOUT_CANNOT_RECOVER)
1580                 return -1;
1581
1582         *out_cmd = cmd;
1583         return 0;
1584 }
1585 EXPORT_SYMBOL(iscsit_check_dataout_hdr);
1586
1587 static int
1588 iscsit_get_dataout(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1589                    struct iscsi_data *hdr)
1590 {
1591         struct kvec *iov;
1592         u32 checksum, iov_count = 0, padding = 0, rx_got = 0, rx_size = 0;
1593         u32 payload_length = ntoh24(hdr->dlength);
1594         int iov_ret, data_crc_failed = 0;
1595
1596         rx_size += payload_length;
1597         iov = &cmd->iov_data[0];
1598
1599         iov_ret = iscsit_map_iovec(cmd, iov, be32_to_cpu(hdr->offset),
1600                                    payload_length);
1601         if (iov_ret < 0)
1602                 return -1;
1603
1604         iov_count += iov_ret;
1605
1606         padding = ((-payload_length) & 3);
1607         if (padding != 0) {
1608                 iov[iov_count].iov_base = cmd->pad_bytes;
1609                 iov[iov_count++].iov_len = padding;
1610                 rx_size += padding;
1611                 pr_debug("Receiving %u padding bytes.\n", padding);
1612         }
1613
1614         if (conn->conn_ops->DataDigest) {
1615                 iov[iov_count].iov_base = &checksum;
1616                 iov[iov_count++].iov_len = ISCSI_CRC_LEN;
1617                 rx_size += ISCSI_CRC_LEN;
1618         }
1619
1620         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
1621
1622         iscsit_unmap_iovec(cmd);
1623
1624         if (rx_got != rx_size)
1625                 return -1;
1626
1627         if (conn->conn_ops->DataDigest) {
1628                 u32 data_crc;
1629
1630                 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
1631                                                     be32_to_cpu(hdr->offset),
1632                                                     payload_length, padding,
1633                                                     cmd->pad_bytes);
1634
1635                 if (checksum != data_crc) {
1636                         pr_err("ITT: 0x%08x, Offset: %u, Length: %u,"
1637                                 " DataSN: 0x%08x, CRC32C DataDigest 0x%08x"
1638                                 " does not match computed 0x%08x\n",
1639                                 hdr->itt, hdr->offset, payload_length,
1640                                 hdr->datasn, checksum, data_crc);
1641                         data_crc_failed = 1;
1642                 } else {
1643                         pr_debug("Got CRC32C DataDigest 0x%08x for"
1644                                 " %u bytes of Data Out\n", checksum,
1645                                 payload_length);
1646                 }
1647         }
1648
1649         return data_crc_failed;
1650 }
1651
1652 int
1653 iscsit_check_dataout_payload(struct iscsi_cmd *cmd, struct iscsi_data *hdr,
1654                              bool data_crc_failed)
1655 {
1656         struct iscsi_conn *conn = cmd->conn;
1657         int rc, ooo_cmdsn;
1658         /*
1659          * Increment post receive data and CRC values or perform
1660          * within-command recovery.
1661          */
1662         rc = iscsit_check_post_dataout(cmd, (unsigned char *)hdr, data_crc_failed);
1663         if ((rc == DATAOUT_NORMAL) || (rc == DATAOUT_WITHIN_COMMAND_RECOVERY))
1664                 return 0;
1665         else if (rc == DATAOUT_SEND_R2T) {
1666                 iscsit_set_dataout_sequence_values(cmd);
1667                 conn->conn_transport->iscsit_get_dataout(conn, cmd, false);
1668         } else if (rc == DATAOUT_SEND_TO_TRANSPORT) {
1669                 /*
1670                  * Handle extra special case for out of order
1671                  * Unsolicited Data Out.
1672                  */
1673                 spin_lock_bh(&cmd->istate_lock);
1674                 ooo_cmdsn = (cmd->cmd_flags & ICF_OOO_CMDSN);
1675                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
1676                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
1677                 spin_unlock_bh(&cmd->istate_lock);
1678
1679                 iscsit_stop_dataout_timer(cmd);
1680                 if (ooo_cmdsn)
1681                         return 0;
1682                 target_execute_cmd(&cmd->se_cmd);
1683                 return 0;
1684         } else /* DATAOUT_CANNOT_RECOVER */
1685                 return -1;
1686
1687         return 0;
1688 }
1689 EXPORT_SYMBOL(iscsit_check_dataout_payload);
1690
1691 static int iscsit_handle_data_out(struct iscsi_conn *conn, unsigned char *buf)
1692 {
1693         struct iscsi_cmd *cmd = NULL;
1694         struct iscsi_data *hdr = (struct iscsi_data *)buf;
1695         int rc;
1696         bool data_crc_failed = false;
1697
1698         rc = iscsit_check_dataout_hdr(conn, buf, &cmd);
1699         if (rc < 0)
1700                 return 0;
1701         else if (!cmd)
1702                 return 0;
1703
1704         rc = iscsit_get_dataout(conn, cmd, hdr);
1705         if (rc < 0)
1706                 return rc;
1707         else if (rc > 0)
1708                 data_crc_failed = true;
1709
1710         return iscsit_check_dataout_payload(cmd, hdr, data_crc_failed);
1711 }
1712
1713 int iscsit_setup_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1714                          struct iscsi_nopout *hdr)
1715 {
1716         u32 payload_length = ntoh24(hdr->dlength);
1717
1718         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL)) {
1719                 pr_err("NopOUT Flag's, Left Most Bit not set, protocol error.\n");
1720                 if (!cmd)
1721                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1722                                                  (unsigned char *)hdr);
1723
1724                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1725                                          (unsigned char *)hdr);
1726         }
1727
1728         if (hdr->itt == RESERVED_ITT && !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1729                 pr_err("NOPOUT ITT is reserved, but Immediate Bit is"
1730                         " not set, protocol error.\n");
1731                 if (!cmd)
1732                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1733                                                  (unsigned char *)hdr);
1734
1735                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1736                                          (unsigned char *)hdr);
1737         }
1738
1739         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
1740                 pr_err("NOPOUT Ping Data DataSegmentLength: %u is"
1741                         " greater than MaxXmitDataSegmentLength: %u, protocol"
1742                         " error.\n", payload_length,
1743                         conn->conn_ops->MaxXmitDataSegmentLength);
1744                 if (!cmd)
1745                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1746                                                  (unsigned char *)hdr);
1747
1748                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
1749                                          (unsigned char *)hdr);
1750         }
1751
1752         pr_debug("Got NOPOUT Ping %s ITT: 0x%08x, TTT: 0x%08x,"
1753                 " CmdSN: 0x%08x, ExpStatSN: 0x%08x, Length: %u\n",
1754                 hdr->itt == RESERVED_ITT ? "Response" : "Request",
1755                 hdr->itt, hdr->ttt, hdr->cmdsn, hdr->exp_statsn,
1756                 payload_length);
1757         /*
1758          * This is not a response to a Unsolicited NopIN, which means
1759          * it can either be a NOPOUT ping request (with a valid ITT),
1760          * or a NOPOUT not requesting a NOPIN (with a reserved ITT).
1761          * Either way, make sure we allocate an struct iscsi_cmd, as both
1762          * can contain ping data.
1763          */
1764         if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1765                 cmd->iscsi_opcode       = ISCSI_OP_NOOP_OUT;
1766                 cmd->i_state            = ISTATE_SEND_NOPIN;
1767                 cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ?
1768                                                 1 : 0);
1769                 conn->sess->init_task_tag = cmd->init_task_tag = hdr->itt;
1770                 cmd->targ_xfer_tag      = 0xFFFFFFFF;
1771                 cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
1772                 cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
1773                 cmd->data_direction     = DMA_NONE;
1774         }
1775
1776         return 0;
1777 }
1778 EXPORT_SYMBOL(iscsit_setup_nop_out);
1779
1780 int iscsit_process_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1781                            struct iscsi_nopout *hdr)
1782 {
1783         struct iscsi_cmd *cmd_p = NULL;
1784         int cmdsn_ret = 0;
1785         /*
1786          * Initiator is expecting a NopIN ping reply..
1787          */
1788         if (hdr->itt != RESERVED_ITT) {
1789                 if (!cmd)
1790                         return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
1791                                                 (unsigned char *)hdr);
1792
1793                 spin_lock_bh(&conn->cmd_lock);
1794                 list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
1795                 spin_unlock_bh(&conn->cmd_lock);
1796
1797                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
1798
1799                 if (hdr->opcode & ISCSI_OP_IMMEDIATE) {
1800                         iscsit_add_cmd_to_response_queue(cmd, conn,
1801                                                          cmd->i_state);
1802                         return 0;
1803                 }
1804
1805                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
1806                                 (unsigned char *)hdr, hdr->cmdsn);
1807                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
1808                         return 0;
1809                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
1810                         return -1;
1811
1812                 return 0;
1813         }
1814         /*
1815          * This was a response to a unsolicited NOPIN ping.
1816          */
1817         if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
1818                 cmd_p = iscsit_find_cmd_from_ttt(conn, be32_to_cpu(hdr->ttt));
1819                 if (!cmd_p)
1820                         return -EINVAL;
1821
1822                 iscsit_stop_nopin_response_timer(conn);
1823
1824                 cmd_p->i_state = ISTATE_REMOVE;
1825                 iscsit_add_cmd_to_immediate_queue(cmd_p, conn, cmd_p->i_state);
1826
1827                 iscsit_start_nopin_timer(conn);
1828                 return 0;
1829         }
1830         /*
1831          * Otherwise, initiator is not expecting a NOPIN is response.
1832          * Just ignore for now.
1833          */
1834
1835         if (cmd)
1836                 iscsit_free_cmd(cmd, false);
1837
1838         return 0;
1839 }
1840 EXPORT_SYMBOL(iscsit_process_nop_out);
1841
1842 static int iscsit_handle_nop_out(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1843                                  unsigned char *buf)
1844 {
1845         unsigned char *ping_data = NULL;
1846         struct iscsi_nopout *hdr = (struct iscsi_nopout *)buf;
1847         struct kvec *iov = NULL;
1848         u32 payload_length = ntoh24(hdr->dlength);
1849         int ret;
1850
1851         ret = iscsit_setup_nop_out(conn, cmd, hdr);
1852         if (ret < 0)
1853                 return 0;
1854         /*
1855          * Handle NOP-OUT payload for traditional iSCSI sockets
1856          */
1857         if (payload_length && hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
1858                 u32 checksum, data_crc, padding = 0;
1859                 int niov = 0, rx_got, rx_size = payload_length;
1860
1861                 ping_data = kzalloc(payload_length + 1, GFP_KERNEL);
1862                 if (!ping_data) {
1863                         pr_err("Unable to allocate memory for"
1864                                 " NOPOUT ping data.\n");
1865                         ret = -1;
1866                         goto out;
1867                 }
1868
1869                 iov = &cmd->iov_misc[0];
1870                 iov[niov].iov_base      = ping_data;
1871                 iov[niov++].iov_len     = payload_length;
1872
1873                 padding = ((-payload_length) & 3);
1874                 if (padding != 0) {
1875                         pr_debug("Receiving %u additional bytes"
1876                                 " for padding.\n", padding);
1877                         iov[niov].iov_base      = &cmd->pad_bytes;
1878                         iov[niov++].iov_len     = padding;
1879                         rx_size += padding;
1880                 }
1881                 if (conn->conn_ops->DataDigest) {
1882                         iov[niov].iov_base      = &checksum;
1883                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
1884                         rx_size += ISCSI_CRC_LEN;
1885                 }
1886
1887                 rx_got = rx_data(conn, &cmd->iov_misc[0], niov, rx_size);
1888                 if (rx_got != rx_size) {
1889                         ret = -1;
1890                         goto out;
1891                 }
1892
1893                 if (conn->conn_ops->DataDigest) {
1894                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
1895                                         ping_data, payload_length,
1896                                         padding, cmd->pad_bytes,
1897                                         (u8 *)&data_crc);
1898
1899                         if (checksum != data_crc) {
1900                                 pr_err("Ping data CRC32C DataDigest"
1901                                 " 0x%08x does not match computed 0x%08x\n",
1902                                         checksum, data_crc);
1903                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
1904                                         pr_err("Unable to recover from"
1905                                         " NOPOUT Ping DataCRC failure while in"
1906                                                 " ERL=0.\n");
1907                                         ret = -1;
1908                                         goto out;
1909                                 } else {
1910                                         /*
1911                                          * Silently drop this PDU and let the
1912                                          * initiator plug the CmdSN gap.
1913                                          */
1914                                         pr_debug("Dropping NOPOUT"
1915                                         " Command CmdSN: 0x%08x due to"
1916                                         " DataCRC error.\n", hdr->cmdsn);
1917                                         ret = 0;
1918                                         goto out;
1919                                 }
1920                         } else {
1921                                 pr_debug("Got CRC32C DataDigest"
1922                                 " 0x%08x for %u bytes of ping data.\n",
1923                                         checksum, payload_length);
1924                         }
1925                 }
1926
1927                 ping_data[payload_length] = '\0';
1928                 /*
1929                  * Attach ping data to struct iscsi_cmd->buf_ptr.
1930                  */
1931                 cmd->buf_ptr = ping_data;
1932                 cmd->buf_ptr_size = payload_length;
1933
1934                 pr_debug("Got %u bytes of NOPOUT ping"
1935                         " data.\n", payload_length);
1936                 pr_debug("Ping Data: \"%s\"\n", ping_data);
1937         }
1938
1939         return iscsit_process_nop_out(conn, cmd, hdr);
1940 out:
1941         if (cmd)
1942                 iscsit_free_cmd(cmd, false);
1943
1944         kfree(ping_data);
1945         return ret;
1946 }
1947
1948 int
1949 iscsit_handle_task_mgt_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
1950                            unsigned char *buf)
1951 {
1952         struct se_tmr_req *se_tmr;
1953         struct iscsi_tmr_req *tmr_req;
1954         struct iscsi_tm *hdr;
1955         int out_of_order_cmdsn = 0, ret;
1956         u8 function, tcm_function = TMR_UNKNOWN;
1957
1958         hdr                     = (struct iscsi_tm *) buf;
1959         hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;
1960         function = hdr->flags;
1961
1962         pr_debug("Got Task Management Request ITT: 0x%08x, CmdSN:"
1963                 " 0x%08x, Function: 0x%02x, RefTaskTag: 0x%08x, RefCmdSN:"
1964                 " 0x%08x, CID: %hu\n", hdr->itt, hdr->cmdsn, function,
1965                 hdr->rtt, hdr->refcmdsn, conn->cid);
1966
1967         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1968             ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
1969              hdr->rtt != RESERVED_ITT)) {
1970                 pr_err("RefTaskTag should be set to 0xFFFFFFFF.\n");
1971                 hdr->rtt = RESERVED_ITT;
1972         }
1973
1974         if ((function == ISCSI_TM_FUNC_TASK_REASSIGN) &&
1975                         !(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
1976                 pr_err("Task Management Request TASK_REASSIGN not"
1977                         " issued as immediate command, bad iSCSI Initiator"
1978                                 "implementation\n");
1979                 return iscsit_add_reject_cmd(cmd,
1980                                              ISCSI_REASON_PROTOCOL_ERROR, buf);
1981         }
1982         if ((function != ISCSI_TM_FUNC_ABORT_TASK) &&
1983             be32_to_cpu(hdr->refcmdsn) != ISCSI_RESERVED_TAG)
1984                 hdr->refcmdsn = cpu_to_be32(ISCSI_RESERVED_TAG);
1985
1986         cmd->data_direction = DMA_NONE;
1987
1988         cmd->tmr_req = kzalloc(sizeof(struct iscsi_tmr_req), GFP_KERNEL);
1989         if (!cmd->tmr_req) {
1990                 pr_err("Unable to allocate memory for"
1991                         " Task Management command!\n");
1992                 return iscsit_add_reject_cmd(cmd,
1993                                              ISCSI_REASON_BOOKMARK_NO_RESOURCES,
1994                                              buf);
1995         }
1996
1997         transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
1998                               conn->sess->se_sess, 0, DMA_NONE,
1999                               TCM_SIMPLE_TAG, cmd->sense_buffer + 2);
2000
2001         target_get_sess_cmd(&cmd->se_cmd, true);
2002
2003         /*
2004          * TASK_REASSIGN for ERL=2 / connection stays inside of
2005          * LIO-Target $FABRIC_MOD
2006          */
2007         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2008                 switch (function) {
2009                 case ISCSI_TM_FUNC_ABORT_TASK:
2010                         tcm_function = TMR_ABORT_TASK;
2011                         break;
2012                 case ISCSI_TM_FUNC_ABORT_TASK_SET:
2013                         tcm_function = TMR_ABORT_TASK_SET;
2014                         break;
2015                 case ISCSI_TM_FUNC_CLEAR_ACA:
2016                         tcm_function = TMR_CLEAR_ACA;
2017                         break;
2018                 case ISCSI_TM_FUNC_CLEAR_TASK_SET:
2019                         tcm_function = TMR_CLEAR_TASK_SET;
2020                         break;
2021                 case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
2022                         tcm_function = TMR_LUN_RESET;
2023                         break;
2024                 case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2025                         tcm_function = TMR_TARGET_WARM_RESET;
2026                         break;
2027                 case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2028                         tcm_function = TMR_TARGET_COLD_RESET;
2029                         break;
2030                 default:
2031                         pr_err("Unknown iSCSI TMR Function:"
2032                                " 0x%02x\n", function);
2033                         return iscsit_add_reject_cmd(cmd,
2034                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2035                 }
2036         }
2037         ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function,
2038                                  GFP_KERNEL);
2039         if (ret < 0)
2040                 return iscsit_add_reject_cmd(cmd,
2041                                 ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
2042
2043         cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
2044
2045         cmd->iscsi_opcode       = ISCSI_OP_SCSI_TMFUNC;
2046         cmd->i_state            = ISTATE_SEND_TASKMGTRSP;
2047         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2048         cmd->init_task_tag      = hdr->itt;
2049         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2050         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2051         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2052         se_tmr                  = cmd->se_cmd.se_tmr_req;
2053         tmr_req                 = cmd->tmr_req;
2054         /*
2055          * Locate the struct se_lun for all TMRs not related to ERL=2 TASK_REASSIGN
2056          */
2057         if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
2058                 ret = transport_lookup_tmr_lun(&cmd->se_cmd,
2059                                                scsilun_to_int(&hdr->lun));
2060                 if (ret < 0) {
2061                         se_tmr->response = ISCSI_TMF_RSP_NO_LUN;
2062                         goto attach;
2063                 }
2064         }
2065
2066         switch (function) {
2067         case ISCSI_TM_FUNC_ABORT_TASK:
2068                 se_tmr->response = iscsit_tmr_abort_task(cmd, buf);
2069                 if (se_tmr->response)
2070                         goto attach;
2071                 break;
2072         case ISCSI_TM_FUNC_ABORT_TASK_SET:
2073         case ISCSI_TM_FUNC_CLEAR_ACA:
2074         case ISCSI_TM_FUNC_CLEAR_TASK_SET:
2075         case ISCSI_TM_FUNC_LOGICAL_UNIT_RESET:
2076                 break;
2077         case ISCSI_TM_FUNC_TARGET_WARM_RESET:
2078                 if (iscsit_tmr_task_warm_reset(conn, tmr_req, buf) < 0) {
2079                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2080                         goto attach;
2081                 }
2082                 break;
2083         case ISCSI_TM_FUNC_TARGET_COLD_RESET:
2084                 if (iscsit_tmr_task_cold_reset(conn, tmr_req, buf) < 0) {
2085                         se_tmr->response = ISCSI_TMF_RSP_AUTH_FAILED;
2086                         goto attach;
2087                 }
2088                 break;
2089         case ISCSI_TM_FUNC_TASK_REASSIGN:
2090                 se_tmr->response = iscsit_tmr_task_reassign(cmd, buf);
2091                 /*
2092                  * Perform sanity checks on the ExpDataSN only if the
2093                  * TASK_REASSIGN was successful.
2094                  */
2095                 if (se_tmr->response)
2096                         break;
2097
2098                 if (iscsit_check_task_reassign_expdatasn(tmr_req, conn) < 0)
2099                         return iscsit_add_reject_cmd(cmd,
2100                                         ISCSI_REASON_BOOKMARK_INVALID, buf);
2101                 break;
2102         default:
2103                 pr_err("Unknown TMR function: 0x%02x, protocol"
2104                         " error.\n", function);
2105                 se_tmr->response = ISCSI_TMF_RSP_NOT_SUPPORTED;
2106                 goto attach;
2107         }
2108
2109         if ((function != ISCSI_TM_FUNC_TASK_REASSIGN) &&
2110             (se_tmr->response == ISCSI_TMF_RSP_COMPLETE))
2111                 se_tmr->call_transport = 1;
2112 attach:
2113         spin_lock_bh(&conn->cmd_lock);
2114         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2115         spin_unlock_bh(&conn->cmd_lock);
2116
2117         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2118                 int cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2119                 if (cmdsn_ret == CMDSN_HIGHER_THAN_EXP) {
2120                         out_of_order_cmdsn = 1;
2121                 } else if (cmdsn_ret == CMDSN_LOWER_THAN_EXP) {
2122                         target_put_sess_cmd(&cmd->se_cmd);
2123                         return 0;
2124                 } else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER) {
2125                         return -1;
2126                 }
2127         }
2128         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2129
2130         if (out_of_order_cmdsn || !(hdr->opcode & ISCSI_OP_IMMEDIATE))
2131                 return 0;
2132         /*
2133          * Found the referenced task, send to transport for processing.
2134          */
2135         if (se_tmr->call_transport)
2136                 return transport_generic_handle_tmr(&cmd->se_cmd);
2137
2138         /*
2139          * Could not find the referenced LUN, task, or Task Management
2140          * command not authorized or supported.  Change state and
2141          * let the tx_thread send the response.
2142          *
2143          * For connection recovery, this is also the default action for
2144          * TMR TASK_REASSIGN.
2145          */
2146         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2147         target_put_sess_cmd(&cmd->se_cmd);
2148         return 0;
2149 }
2150 EXPORT_SYMBOL(iscsit_handle_task_mgt_cmd);
2151
2152 /* #warning FIXME: Support Text Command parameters besides SendTargets */
2153 int
2154 iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2155                       struct iscsi_text *hdr)
2156 {
2157         u32 payload_length = ntoh24(hdr->dlength);
2158
2159         if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
2160                 pr_err("Unable to accept text parameter length: %u"
2161                         "greater than MaxXmitDataSegmentLength %u.\n",
2162                        payload_length, conn->conn_ops->MaxXmitDataSegmentLength);
2163                 return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2164                                          (unsigned char *)hdr);
2165         }
2166
2167         if (!(hdr->flags & ISCSI_FLAG_CMD_FINAL) ||
2168              (hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)) {
2169                 pr_err("Multi sequence text commands currently not supported\n");
2170                 return iscsit_reject_cmd(cmd, ISCSI_REASON_CMD_NOT_SUPPORTED,
2171                                         (unsigned char *)hdr);
2172         }
2173
2174         pr_debug("Got Text Request: ITT: 0x%08x, CmdSN: 0x%08x,"
2175                 " ExpStatSN: 0x%08x, Length: %u\n", hdr->itt, hdr->cmdsn,
2176                 hdr->exp_statsn, payload_length);
2177
2178         cmd->iscsi_opcode       = ISCSI_OP_TEXT;
2179         cmd->i_state            = ISTATE_SEND_TEXTRSP;
2180         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2181         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2182         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2183         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2184         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2185         cmd->data_direction     = DMA_NONE;
2186         kfree(cmd->text_in_ptr);
2187         cmd->text_in_ptr        = NULL;
2188
2189         return 0;
2190 }
2191 EXPORT_SYMBOL(iscsit_setup_text_cmd);
2192
2193 int
2194 iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2195                         struct iscsi_text *hdr)
2196 {
2197         unsigned char *text_in = cmd->text_in_ptr, *text_ptr;
2198         int cmdsn_ret;
2199
2200         if (!text_in) {
2201                 cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt);
2202                 if (cmd->targ_xfer_tag == 0xFFFFFFFF) {
2203                         pr_err("Unable to locate text_in buffer for sendtargets"
2204                                " discovery\n");
2205                         goto reject;
2206                 }
2207                 goto empty_sendtargets;
2208         }
2209         if (strncmp("SendTargets", text_in, 11) != 0) {
2210                 pr_err("Received Text Data that is not"
2211                         " SendTargets, cannot continue.\n");
2212                 goto reject;
2213         }
2214         text_ptr = strchr(text_in, '=');
2215         if (!text_ptr) {
2216                 pr_err("No \"=\" separator found in Text Data,"
2217                         "  cannot continue.\n");
2218                 goto reject;
2219         }
2220         if (!strncmp("=All", text_ptr, 4)) {
2221                 cmd->cmd_flags |= ICF_SENDTARGETS_ALL;
2222         } else if (!strncmp("=iqn.", text_ptr, 5) ||
2223                    !strncmp("=eui.", text_ptr, 5)) {
2224                 cmd->cmd_flags |= ICF_SENDTARGETS_SINGLE;
2225         } else {
2226                 pr_err("Unable to locate valid SendTargets=%s value\n", text_ptr);
2227                 goto reject;
2228         }
2229
2230         spin_lock_bh(&conn->cmd_lock);
2231         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2232         spin_unlock_bh(&conn->cmd_lock);
2233
2234 empty_sendtargets:
2235         iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2236
2237         if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) {
2238                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd,
2239                                 (unsigned char *)hdr, hdr->cmdsn);
2240                 if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2241                         return -1;
2242
2243                 return 0;
2244         }
2245
2246         return iscsit_execute_cmd(cmd, 0);
2247
2248 reject:
2249         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR,
2250                                  (unsigned char *)hdr);
2251 }
2252 EXPORT_SYMBOL(iscsit_process_text_cmd);
2253
2254 static int
2255 iscsit_handle_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2256                        unsigned char *buf)
2257 {
2258         struct iscsi_text *hdr = (struct iscsi_text *)buf;
2259         char *text_in = NULL;
2260         u32 payload_length = ntoh24(hdr->dlength);
2261         int rx_size, rc;
2262
2263         rc = iscsit_setup_text_cmd(conn, cmd, hdr);
2264         if (rc < 0)
2265                 return 0;
2266
2267         rx_size = payload_length;
2268         if (payload_length) {
2269                 u32 checksum = 0, data_crc = 0;
2270                 u32 padding = 0, pad_bytes = 0;
2271                 int niov = 0, rx_got;
2272                 struct kvec iov[3];
2273
2274                 text_in = kzalloc(payload_length, GFP_KERNEL);
2275                 if (!text_in) {
2276                         pr_err("Unable to allocate memory for"
2277                                 " incoming text parameters\n");
2278                         goto reject;
2279                 }
2280                 cmd->text_in_ptr = text_in;
2281
2282                 memset(iov, 0, 3 * sizeof(struct kvec));
2283                 iov[niov].iov_base      = text_in;
2284                 iov[niov++].iov_len     = payload_length;
2285
2286                 padding = ((-payload_length) & 3);
2287                 if (padding != 0) {
2288                         iov[niov].iov_base = &pad_bytes;
2289                         iov[niov++].iov_len  = padding;
2290                         rx_size += padding;
2291                         pr_debug("Receiving %u additional bytes"
2292                                         " for padding.\n", padding);
2293                 }
2294                 if (conn->conn_ops->DataDigest) {
2295                         iov[niov].iov_base      = &checksum;
2296                         iov[niov++].iov_len     = ISCSI_CRC_LEN;
2297                         rx_size += ISCSI_CRC_LEN;
2298                 }
2299
2300                 rx_got = rx_data(conn, &iov[0], niov, rx_size);
2301                 if (rx_got != rx_size)
2302                         goto reject;
2303
2304                 if (conn->conn_ops->DataDigest) {
2305                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
2306                                         text_in, payload_length,
2307                                         padding, (u8 *)&pad_bytes,
2308                                         (u8 *)&data_crc);
2309
2310                         if (checksum != data_crc) {
2311                                 pr_err("Text data CRC32C DataDigest"
2312                                         " 0x%08x does not match computed"
2313                                         " 0x%08x\n", checksum, data_crc);
2314                                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2315                                         pr_err("Unable to recover from"
2316                                         " Text Data digest failure while in"
2317                                                 " ERL=0.\n");
2318                                         goto reject;
2319                                 } else {
2320                                         /*
2321                                          * Silently drop this PDU and let the
2322                                          * initiator plug the CmdSN gap.
2323                                          */
2324                                         pr_debug("Dropping Text"
2325                                         " Command CmdSN: 0x%08x due to"
2326                                         " DataCRC error.\n", hdr->cmdsn);
2327                                         kfree(text_in);
2328                                         return 0;
2329                                 }
2330                         } else {
2331                                 pr_debug("Got CRC32C DataDigest"
2332                                         " 0x%08x for %u bytes of text data.\n",
2333                                                 checksum, payload_length);
2334                         }
2335                 }
2336                 text_in[payload_length - 1] = '\0';
2337                 pr_debug("Successfully read %d bytes of text"
2338                                 " data.\n", payload_length);
2339         }
2340
2341         return iscsit_process_text_cmd(conn, cmd, hdr);
2342
2343 reject:
2344         kfree(cmd->text_in_ptr);
2345         cmd->text_in_ptr = NULL;
2346         return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
2347 }
2348
2349 int iscsit_logout_closesession(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2350 {
2351         struct iscsi_conn *conn_p;
2352         struct iscsi_session *sess = conn->sess;
2353
2354         pr_debug("Received logout request CLOSESESSION on CID: %hu"
2355                 " for SID: %u.\n", conn->cid, conn->sess->sid);
2356
2357         atomic_set(&sess->session_logout, 1);
2358         atomic_set(&conn->conn_logout_remove, 1);
2359         conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_SESSION;
2360
2361         iscsit_inc_conn_usage_count(conn);
2362         iscsit_inc_session_usage_count(sess);
2363
2364         spin_lock_bh(&sess->conn_lock);
2365         list_for_each_entry(conn_p, &sess->sess_conn_list, conn_list) {
2366                 if (conn_p->conn_state != TARG_CONN_STATE_LOGGED_IN)
2367                         continue;
2368
2369                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2370                 conn_p->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2371         }
2372         spin_unlock_bh(&sess->conn_lock);
2373
2374         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2375
2376         return 0;
2377 }
2378
2379 int iscsit_logout_closeconnection(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2380 {
2381         struct iscsi_conn *l_conn;
2382         struct iscsi_session *sess = conn->sess;
2383
2384         pr_debug("Received logout request CLOSECONNECTION for CID:"
2385                 " %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2386
2387         /*
2388          * A Logout Request with a CLOSECONNECTION reason code for a CID
2389          * can arrive on a connection with a differing CID.
2390          */
2391         if (conn->cid == cmd->logout_cid) {
2392                 spin_lock_bh(&conn->state_lock);
2393                 pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
2394                 conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
2395
2396                 atomic_set(&conn->conn_logout_remove, 1);
2397                 conn->conn_logout_reason = ISCSI_LOGOUT_REASON_CLOSE_CONNECTION;
2398                 iscsit_inc_conn_usage_count(conn);
2399
2400                 spin_unlock_bh(&conn->state_lock);
2401         } else {
2402                 /*
2403                  * Handle all different cid CLOSECONNECTION requests in
2404                  * iscsit_logout_post_handler_diffcid() as to give enough
2405                  * time for any non immediate command's CmdSN to be
2406                  * acknowledged on the connection in question.
2407                  *
2408                  * Here we simply make sure the CID is still around.
2409                  */
2410                 l_conn = iscsit_get_conn_from_cid(sess,
2411                                 cmd->logout_cid);
2412                 if (!l_conn) {
2413                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2414                         iscsit_add_cmd_to_response_queue(cmd, conn,
2415                                         cmd->i_state);
2416                         return 0;
2417                 }
2418
2419                 iscsit_dec_conn_usage_count(l_conn);
2420         }
2421
2422         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2423
2424         return 0;
2425 }
2426
2427 int iscsit_logout_removeconnforrecovery(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2428 {
2429         struct iscsi_session *sess = conn->sess;
2430
2431         pr_debug("Received explicit REMOVECONNFORRECOVERY logout for"
2432                 " CID: %hu on CID: %hu.\n", cmd->logout_cid, conn->cid);
2433
2434         if (sess->sess_ops->ErrorRecoveryLevel != 2) {
2435                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2436                         " while ERL!=2.\n");
2437                 cmd->logout_response = ISCSI_LOGOUT_RECOVERY_UNSUPPORTED;
2438                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2439                 return 0;
2440         }
2441
2442         if (conn->cid == cmd->logout_cid) {
2443                 pr_err("Received Logout Request REMOVECONNFORRECOVERY"
2444                         " with CID: %hu on CID: %hu, implementation error.\n",
2445                                 cmd->logout_cid, conn->cid);
2446                 cmd->logout_response = ISCSI_LOGOUT_CLEANUP_FAILED;
2447                 iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2448                 return 0;
2449         }
2450
2451         iscsit_add_cmd_to_response_queue(cmd, conn, cmd->i_state);
2452
2453         return 0;
2454 }
2455
2456 int
2457 iscsit_handle_logout_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd,
2458                         unsigned char *buf)
2459 {
2460         int cmdsn_ret, logout_remove = 0;
2461         u8 reason_code = 0;
2462         struct iscsi_logout *hdr;
2463         struct iscsi_tiqn *tiqn = iscsit_snmp_get_tiqn(conn);
2464
2465         hdr                     = (struct iscsi_logout *) buf;
2466         reason_code             = (hdr->flags & 0x7f);
2467
2468         if (tiqn) {
2469                 spin_lock(&tiqn->logout_stats.lock);
2470                 if (reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION)
2471                         tiqn->logout_stats.normal_logouts++;
2472                 else
2473                         tiqn->logout_stats.abnormal_logouts++;
2474                 spin_unlock(&tiqn->logout_stats.lock);
2475         }
2476
2477         pr_debug("Got Logout Request ITT: 0x%08x CmdSN: 0x%08x"
2478                 " ExpStatSN: 0x%08x Reason: 0x%02x CID: %hu on CID: %hu\n",
2479                 hdr->itt, hdr->cmdsn, hdr->exp_statsn, reason_code,
2480                 hdr->cid, conn->cid);
2481
2482         if (conn->conn_state != TARG_CONN_STATE_LOGGED_IN) {
2483                 pr_err("Received logout request on connection that"
2484                         " is not in logged in state, ignoring request.\n");
2485                 iscsit_free_cmd(cmd, false);
2486                 return 0;
2487         }
2488
2489         cmd->iscsi_opcode       = ISCSI_OP_LOGOUT;
2490         cmd->i_state            = ISTATE_SEND_LOGOUTRSP;
2491         cmd->immediate_cmd      = ((hdr->opcode & ISCSI_OP_IMMEDIATE) ? 1 : 0);
2492         conn->sess->init_task_tag = cmd->init_task_tag  = hdr->itt;
2493         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2494         cmd->cmd_sn             = be32_to_cpu(hdr->cmdsn);
2495         cmd->exp_stat_sn        = be32_to_cpu(hdr->exp_statsn);
2496         cmd->logout_cid         = be16_to_cpu(hdr->cid);
2497         cmd->logout_reason      = reason_code;
2498         cmd->data_direction     = DMA_NONE;
2499
2500         /*
2501          * We need to sleep in these cases (by returning 1) until the Logout
2502          * Response gets sent in the tx thread.
2503          */
2504         if ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_SESSION) ||
2505            ((reason_code == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION) &&
2506             be16_to_cpu(hdr->cid) == conn->cid))
2507                 logout_remove = 1;
2508
2509         spin_lock_bh(&conn->cmd_lock);
2510         list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list);
2511         spin_unlock_bh(&conn->cmd_lock);
2512
2513         if (reason_code != ISCSI_LOGOUT_REASON_RECOVERY)
2514                 iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn));
2515
2516         /*
2517          * Immediate commands are executed, well, immediately.
2518          * Non-Immediate Logout Commands are executed in CmdSN order.
2519          */
2520         if (cmd->immediate_cmd) {
2521                 int ret = iscsit_execute_cmd(cmd, 0);
2522
2523                 if (ret < 0)
2524                         return ret;
2525         } else {
2526                 cmdsn_ret = iscsit_sequence_cmd(conn, cmd, buf, hdr->cmdsn);
2527                 if (cmdsn_ret == CMDSN_LOWER_THAN_EXP)
2528                         logout_remove = 0;
2529                 else if (cmdsn_ret == CMDSN_ERROR_CANNOT_RECOVER)
2530                         return -1;
2531         }
2532
2533         return logout_remove;
2534 }
2535 EXPORT_SYMBOL(iscsit_handle_logout_cmd);
2536
2537 int iscsit_handle_snack(
2538         struct iscsi_conn *conn,
2539         unsigned char *buf)
2540 {
2541         struct iscsi_snack *hdr;
2542
2543         hdr                     = (struct iscsi_snack *) buf;
2544         hdr->flags              &= ~ISCSI_FLAG_CMD_FINAL;
2545
2546         pr_debug("Got ISCSI_INIT_SNACK, ITT: 0x%08x, ExpStatSN:"
2547                 " 0x%08x, Type: 0x%02x, BegRun: 0x%08x, RunLength: 0x%08x,"
2548                 " CID: %hu\n", hdr->itt, hdr->exp_statsn, hdr->flags,
2549                         hdr->begrun, hdr->runlength, conn->cid);
2550
2551         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2552                 pr_err("Initiator sent SNACK request while in"
2553                         " ErrorRecoveryLevel=0.\n");
2554                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2555                                          buf);
2556         }
2557         /*
2558          * SNACK_DATA and SNACK_R2T are both 0,  so check which function to
2559          * call from inside iscsi_send_recovery_datain_or_r2t().
2560          */
2561         switch (hdr->flags & ISCSI_FLAG_SNACK_TYPE_MASK) {
2562         case 0:
2563                 return iscsit_handle_recovery_datain_or_r2t(conn, buf,
2564                         hdr->itt,
2565                         be32_to_cpu(hdr->ttt),
2566                         be32_to_cpu(hdr->begrun),
2567                         be32_to_cpu(hdr->runlength));
2568         case ISCSI_FLAG_SNACK_TYPE_STATUS:
2569                 return iscsit_handle_status_snack(conn, hdr->itt,
2570                         be32_to_cpu(hdr->ttt),
2571                         be32_to_cpu(hdr->begrun), be32_to_cpu(hdr->runlength));
2572         case ISCSI_FLAG_SNACK_TYPE_DATA_ACK:
2573                 return iscsit_handle_data_ack(conn, be32_to_cpu(hdr->ttt),
2574                         be32_to_cpu(hdr->begrun),
2575                         be32_to_cpu(hdr->runlength));
2576         case ISCSI_FLAG_SNACK_TYPE_RDATA:
2577                 /* FIXME: Support R-Data SNACK */
2578                 pr_err("R-Data SNACK Not Supported.\n");
2579                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2580                                          buf);
2581         default:
2582                 pr_err("Unknown SNACK type 0x%02x, protocol"
2583                         " error.\n", hdr->flags & 0x0f);
2584                 return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
2585                                          buf);
2586         }
2587
2588         return 0;
2589 }
2590 EXPORT_SYMBOL(iscsit_handle_snack);
2591
2592 static void iscsit_rx_thread_wait_for_tcp(struct iscsi_conn *conn)
2593 {
2594         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2595             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2596                 wait_for_completion_interruptible_timeout(
2597                                         &conn->rx_half_close_comp,
2598                                         ISCSI_RX_THREAD_TCP_TIMEOUT * HZ);
2599         }
2600 }
2601
2602 static int iscsit_handle_immediate_data(
2603         struct iscsi_cmd *cmd,
2604         struct iscsi_scsi_req *hdr,
2605         u32 length)
2606 {
2607         int iov_ret, rx_got = 0, rx_size = 0;
2608         u32 checksum, iov_count = 0, padding = 0;
2609         struct iscsi_conn *conn = cmd->conn;
2610         struct kvec *iov;
2611
2612         iov_ret = iscsit_map_iovec(cmd, cmd->iov_data, cmd->write_data_done, length);
2613         if (iov_ret < 0)
2614                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2615
2616         rx_size = length;
2617         iov_count = iov_ret;
2618         iov = &cmd->iov_data[0];
2619
2620         padding = ((-length) & 3);
2621         if (padding != 0) {
2622                 iov[iov_count].iov_base = cmd->pad_bytes;
2623                 iov[iov_count++].iov_len = padding;
2624                 rx_size += padding;
2625         }
2626
2627         if (conn->conn_ops->DataDigest) {
2628                 iov[iov_count].iov_base         = &checksum;
2629                 iov[iov_count++].iov_len        = ISCSI_CRC_LEN;
2630                 rx_size += ISCSI_CRC_LEN;
2631         }
2632
2633         rx_got = rx_data(conn, &cmd->iov_data[0], iov_count, rx_size);
2634
2635         iscsit_unmap_iovec(cmd);
2636
2637         if (rx_got != rx_size) {
2638                 iscsit_rx_thread_wait_for_tcp(conn);
2639                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2640         }
2641
2642         if (conn->conn_ops->DataDigest) {
2643                 u32 data_crc;
2644
2645                 data_crc = iscsit_do_crypto_hash_sg(conn->conn_rx_hash, cmd,
2646                                                     cmd->write_data_done, length, padding,
2647                                                     cmd->pad_bytes);
2648
2649                 if (checksum != data_crc) {
2650                         pr_err("ImmediateData CRC32C DataDigest 0x%08x"
2651                                 " does not match computed 0x%08x\n", checksum,
2652                                 data_crc);
2653
2654                         if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
2655                                 pr_err("Unable to recover from"
2656                                         " Immediate Data digest failure while"
2657                                         " in ERL=0.\n");
2658                                 iscsit_reject_cmd(cmd,
2659                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2660                                                 (unsigned char *)hdr);
2661                                 return IMMEDIATE_DATA_CANNOT_RECOVER;
2662                         } else {
2663                                 iscsit_reject_cmd(cmd,
2664                                                 ISCSI_REASON_DATA_DIGEST_ERROR,
2665                                                 (unsigned char *)hdr);
2666                                 return IMMEDIATE_DATA_ERL1_CRC_FAILURE;
2667                         }
2668                 } else {
2669                         pr_debug("Got CRC32C DataDigest 0x%08x for"
2670                                 " %u bytes of Immediate Data\n", checksum,
2671                                 length);
2672                 }
2673         }
2674
2675         cmd->write_data_done += length;
2676
2677         if (cmd->write_data_done == cmd->se_cmd.data_length) {
2678                 spin_lock_bh(&cmd->istate_lock);
2679                 cmd->cmd_flags |= ICF_GOT_LAST_DATAOUT;
2680                 cmd->i_state = ISTATE_RECEIVED_LAST_DATAOUT;
2681                 spin_unlock_bh(&cmd->istate_lock);
2682         }
2683
2684         return IMMEDIATE_DATA_NORMAL_OPERATION;
2685 }
2686
2687 /*
2688  *      Called with sess->conn_lock held.
2689  */
2690 /* #warning iscsi_build_conn_drop_async_message() only sends out on connections
2691         with active network interface */
2692 static void iscsit_build_conn_drop_async_message(struct iscsi_conn *conn)
2693 {
2694         struct iscsi_cmd *cmd;
2695         struct iscsi_conn *conn_p;
2696         bool found = false;
2697
2698         /*
2699          * Only send a Asynchronous Message on connections whos network
2700          * interface is still functional.
2701          */
2702         list_for_each_entry(conn_p, &conn->sess->sess_conn_list, conn_list) {
2703                 if (conn_p->conn_state == TARG_CONN_STATE_LOGGED_IN) {
2704                         iscsit_inc_conn_usage_count(conn_p);
2705                         found = true;
2706                         break;
2707                 }
2708         }
2709
2710         if (!found)
2711                 return;
2712
2713         cmd = iscsit_allocate_cmd(conn_p, TASK_RUNNING);
2714         if (!cmd) {
2715                 iscsit_dec_conn_usage_count(conn_p);
2716                 return;
2717         }
2718
2719         cmd->logout_cid = conn->cid;
2720         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2721         cmd->i_state = ISTATE_SEND_ASYNCMSG;
2722
2723         spin_lock_bh(&conn_p->cmd_lock);
2724         list_add_tail(&cmd->i_conn_node, &conn_p->conn_cmd_list);
2725         spin_unlock_bh(&conn_p->cmd_lock);
2726
2727         iscsit_add_cmd_to_response_queue(cmd, conn_p, cmd->i_state);
2728         iscsit_dec_conn_usage_count(conn_p);
2729 }
2730
2731 static int iscsit_send_conn_drop_async_message(
2732         struct iscsi_cmd *cmd,
2733         struct iscsi_conn *conn)
2734 {
2735         struct iscsi_async *hdr;
2736
2737         cmd->iscsi_opcode = ISCSI_OP_ASYNC_EVENT;
2738
2739         hdr                     = (struct iscsi_async *) cmd->pdu;
2740         hdr->opcode             = ISCSI_OP_ASYNC_EVENT;
2741         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
2742         cmd->init_task_tag      = RESERVED_ITT;
2743         cmd->targ_xfer_tag      = 0xFFFFFFFF;
2744         put_unaligned_be64(0xFFFFFFFFFFFFFFFFULL, &hdr->rsvd4[0]);
2745         cmd->stat_sn            = conn->stat_sn++;
2746         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2747         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2748         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2749         hdr->async_event        = ISCSI_ASYNC_MSG_DROPPING_CONNECTION;
2750         hdr->param1             = cpu_to_be16(cmd->logout_cid);
2751         hdr->param2             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Wait);
2752         hdr->param3             = cpu_to_be16(conn->sess->sess_ops->DefaultTime2Retain);
2753
2754         pr_debug("Sending Connection Dropped Async Message StatSN:"
2755                 " 0x%08x, for CID: %hu on CID: %hu\n", cmd->stat_sn,
2756                         cmd->logout_cid, conn->cid);
2757
2758         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2759 }
2760
2761 static void iscsit_tx_thread_wait_for_tcp(struct iscsi_conn *conn)
2762 {
2763         if ((conn->sock->sk->sk_shutdown & SEND_SHUTDOWN) ||
2764             (conn->sock->sk->sk_shutdown & RCV_SHUTDOWN)) {
2765                 wait_for_completion_interruptible_timeout(
2766                                         &conn->tx_half_close_comp,
2767                                         ISCSI_TX_THREAD_TCP_TIMEOUT * HZ);
2768         }
2769 }
2770
2771 void
2772 iscsit_build_datain_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2773                         struct iscsi_datain *datain, struct iscsi_data_rsp *hdr,
2774                         bool set_statsn)
2775 {
2776         hdr->opcode             = ISCSI_OP_SCSI_DATA_IN;
2777         hdr->flags              = datain->flags;
2778         if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
2779                 if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
2780                         hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
2781                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2782                 } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
2783                         hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
2784                         hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
2785                 }
2786         }
2787         hton24(hdr->dlength, datain->length);
2788         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2789                 int_to_scsilun(cmd->se_cmd.orig_fe_lun,
2790                                 (struct scsi_lun *)&hdr->lun);
2791         else
2792                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2793
2794         hdr->itt                = cmd->init_task_tag;
2795
2796         if (hdr->flags & ISCSI_FLAG_DATA_ACK)
2797                 hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2798         else
2799                 hdr->ttt                = cpu_to_be32(0xFFFFFFFF);
2800         if (set_statsn)
2801                 hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2802         else
2803                 hdr->statsn             = cpu_to_be32(0xFFFFFFFF);
2804
2805         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2806         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2807         hdr->datasn             = cpu_to_be32(datain->data_sn);
2808         hdr->offset             = cpu_to_be32(datain->offset);
2809
2810         pr_debug("Built DataIN ITT: 0x%08x, StatSN: 0x%08x,"
2811                 " DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
2812                 cmd->init_task_tag, ntohl(hdr->statsn), ntohl(hdr->datasn),
2813                 ntohl(hdr->offset), datain->length, conn->cid);
2814 }
2815 EXPORT_SYMBOL(iscsit_build_datain_pdu);
2816
2817 static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2818 {
2819         struct iscsi_data_rsp *hdr = (struct iscsi_data_rsp *)&cmd->pdu[0];
2820         struct iscsi_datain datain;
2821         struct iscsi_datain_req *dr;
2822         int eodr = 0, ret;
2823         bool set_statsn = false;
2824
2825         memset(&datain, 0, sizeof(struct iscsi_datain));
2826         dr = iscsit_get_datain_values(cmd, &datain);
2827         if (!dr) {
2828                 pr_err("iscsit_get_datain_values failed for ITT: 0x%08x\n",
2829                                 cmd->init_task_tag);
2830                 return -1;
2831         }
2832         /*
2833          * Be paranoid and double check the logic for now.
2834          */
2835         if ((datain.offset + datain.length) > cmd->se_cmd.data_length) {
2836                 pr_err("Command ITT: 0x%08x, datain.offset: %u and"
2837                         " datain.length: %u exceeds cmd->data_length: %u\n",
2838                         cmd->init_task_tag, datain.offset, datain.length,
2839                         cmd->se_cmd.data_length);
2840                 return -1;
2841         }
2842
2843         atomic_long_add(datain.length, &conn->sess->tx_data_octets);
2844         /*
2845          * Special case for successfully execution w/ both DATAIN
2846          * and Sense Data.
2847          */
2848         if ((datain.flags & ISCSI_FLAG_DATA_STATUS) &&
2849             (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE))
2850                 datain.flags &= ~ISCSI_FLAG_DATA_STATUS;
2851         else {
2852                 if ((dr->dr_complete == DATAIN_COMPLETE_NORMAL) ||
2853                     (dr->dr_complete == DATAIN_COMPLETE_CONNECTION_RECOVERY)) {
2854                         iscsit_increment_maxcmdsn(cmd, conn->sess);
2855                         cmd->stat_sn = conn->stat_sn++;
2856                         set_statsn = true;
2857                 } else if (dr->dr_complete ==
2858                            DATAIN_COMPLETE_WITHIN_COMMAND_RECOVERY)
2859                         set_statsn = true;
2860         }
2861
2862         iscsit_build_datain_pdu(cmd, conn, &datain, hdr, set_statsn);
2863
2864         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, dr, &datain, 0);
2865         if (ret < 0)
2866                 return ret;
2867
2868         if (dr->dr_complete) {
2869                 eodr = (cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ?
2870                                 2 : 1;
2871                 iscsit_free_datain_req(cmd, dr);
2872         }
2873
2874         return eodr;
2875 }
2876
2877 int
2878 iscsit_build_logout_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2879                         struct iscsi_logout_rsp *hdr)
2880 {
2881         struct iscsi_conn *logout_conn = NULL;
2882         struct iscsi_conn_recovery *cr = NULL;
2883         struct iscsi_session *sess = conn->sess;
2884         /*
2885          * The actual shutting down of Sessions and/or Connections
2886          * for CLOSESESSION and CLOSECONNECTION Logout Requests
2887          * is done in scsi_logout_post_handler().
2888          */
2889         switch (cmd->logout_reason) {
2890         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
2891                 pr_debug("iSCSI session logout successful, setting"
2892                         " logout response to ISCSI_LOGOUT_SUCCESS.\n");
2893                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2894                 break;
2895         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
2896                 if (cmd->logout_response == ISCSI_LOGOUT_CID_NOT_FOUND)
2897                         break;
2898                 /*
2899                  * For CLOSECONNECTION logout requests carrying
2900                  * a matching logout CID -> local CID, the reference
2901                  * for the local CID will have been incremented in
2902                  * iscsi_logout_closeconnection().
2903                  *
2904                  * For CLOSECONNECTION logout requests carrying
2905                  * a different CID than the connection it arrived
2906                  * on, the connection responding to cmd->logout_cid
2907                  * is stopped in iscsit_logout_post_handler_diffcid().
2908                  */
2909
2910                 pr_debug("iSCSI CID: %hu logout on CID: %hu"
2911                         " successful.\n", cmd->logout_cid, conn->cid);
2912                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2913                 break;
2914         case ISCSI_LOGOUT_REASON_RECOVERY:
2915                 if ((cmd->logout_response == ISCSI_LOGOUT_RECOVERY_UNSUPPORTED) ||
2916                     (cmd->logout_response == ISCSI_LOGOUT_CLEANUP_FAILED))
2917                         break;
2918                 /*
2919                  * If the connection is still active from our point of view
2920                  * force connection recovery to occur.
2921                  */
2922                 logout_conn = iscsit_get_conn_from_cid_rcfr(sess,
2923                                 cmd->logout_cid);
2924                 if (logout_conn) {
2925                         iscsit_connection_reinstatement_rcfr(logout_conn);
2926                         iscsit_dec_conn_usage_count(logout_conn);
2927                 }
2928
2929                 cr = iscsit_get_inactive_connection_recovery_entry(
2930                                 conn->sess, cmd->logout_cid);
2931                 if (!cr) {
2932                         pr_err("Unable to locate CID: %hu for"
2933                         " REMOVECONNFORRECOVERY Logout Request.\n",
2934                                 cmd->logout_cid);
2935                         cmd->logout_response = ISCSI_LOGOUT_CID_NOT_FOUND;
2936                         break;
2937                 }
2938
2939                 iscsit_discard_cr_cmds_by_expstatsn(cr, cmd->exp_stat_sn);
2940
2941                 pr_debug("iSCSI REMOVECONNFORRECOVERY logout"
2942                         " for recovery for CID: %hu on CID: %hu successful.\n",
2943                                 cmd->logout_cid, conn->cid);
2944                 cmd->logout_response = ISCSI_LOGOUT_SUCCESS;
2945                 break;
2946         default:
2947                 pr_err("Unknown cmd->logout_reason: 0x%02x\n",
2948                                 cmd->logout_reason);
2949                 return -1;
2950         }
2951
2952         hdr->opcode             = ISCSI_OP_LOGOUT_RSP;
2953         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2954         hdr->response           = cmd->logout_response;
2955         hdr->itt                = cmd->init_task_tag;
2956         cmd->stat_sn            = conn->stat_sn++;
2957         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2958
2959         iscsit_increment_maxcmdsn(cmd, conn->sess);
2960         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
2961         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
2962
2963         pr_debug("Built Logout Response ITT: 0x%08x StatSN:"
2964                 " 0x%08x Response: 0x%02x CID: %hu on CID: %hu\n",
2965                 cmd->init_task_tag, cmd->stat_sn, hdr->response,
2966                 cmd->logout_cid, conn->cid);
2967
2968         return 0;
2969 }
2970 EXPORT_SYMBOL(iscsit_build_logout_rsp);
2971
2972 static int
2973 iscsit_send_logout(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
2974 {
2975         int rc;
2976
2977         rc = iscsit_build_logout_rsp(cmd, conn,
2978                         (struct iscsi_logout_rsp *)&cmd->pdu[0]);
2979         if (rc < 0)
2980                 return rc;
2981
2982         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
2983 }
2984
2985 void
2986 iscsit_build_nopin_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
2987                        struct iscsi_nopin *hdr, bool nopout_response)
2988 {
2989         hdr->opcode             = ISCSI_OP_NOOP_IN;
2990         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
2991         hton24(hdr->dlength, cmd->buf_ptr_size);
2992         if (nopout_response)
2993                 put_unaligned_le64(0xFFFFFFFFFFFFFFFFULL, &hdr->lun);
2994         hdr->itt                = cmd->init_task_tag;
2995         hdr->ttt                = cpu_to_be32(cmd->targ_xfer_tag);
2996         cmd->stat_sn            = (nopout_response) ? conn->stat_sn++ :
2997                                   conn->stat_sn;
2998         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
2999
3000         if (nopout_response)
3001                 iscsit_increment_maxcmdsn(cmd, conn->sess);
3002
3003         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3004         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3005
3006         pr_debug("Built NOPIN %s Response ITT: 0x%08x, TTT: 0x%08x,"
3007                 " StatSN: 0x%08x, Length %u\n", (nopout_response) ?
3008                 "Solicited" : "Unsolicited", cmd->init_task_tag,
3009                 cmd->targ_xfer_tag, cmd->stat_sn, cmd->buf_ptr_size);
3010 }
3011 EXPORT_SYMBOL(iscsit_build_nopin_rsp);
3012
3013 /*
3014  *      Unsolicited NOPIN, either requesting a response or not.
3015  */
3016 static int iscsit_send_unsolicited_nopin(
3017         struct iscsi_cmd *cmd,
3018         struct iscsi_conn *conn,
3019         int want_response)
3020 {
3021         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3022         int ret;
3023
3024         iscsit_build_nopin_rsp(cmd, conn, hdr, false);
3025
3026         pr_debug("Sending Unsolicited NOPIN TTT: 0x%08x StatSN:"
3027                 " 0x%08x CID: %hu\n", hdr->ttt, cmd->stat_sn, conn->cid);
3028
3029         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3030         if (ret < 0)
3031                 return ret;
3032
3033         spin_lock_bh(&cmd->istate_lock);
3034         cmd->i_state = want_response ?
3035                 ISTATE_SENT_NOPIN_WANT_RESPONSE : ISTATE_SENT_STATUS;
3036         spin_unlock_bh(&cmd->istate_lock);
3037
3038         return 0;
3039 }
3040
3041 static int
3042 iscsit_send_nopin(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3043 {
3044         struct iscsi_nopin *hdr = (struct iscsi_nopin *)&cmd->pdu[0];
3045
3046         iscsit_build_nopin_rsp(cmd, conn, hdr, true);
3047
3048         /*
3049          * NOPOUT Ping Data is attached to struct iscsi_cmd->buf_ptr.
3050          * NOPOUT DataSegmentLength is at struct iscsi_cmd->buf_ptr_size.
3051          */
3052         pr_debug("Echoing back %u bytes of ping data.\n", cmd->buf_ptr_size);
3053
3054         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3055                                                      cmd->buf_ptr,
3056                                                      cmd->buf_ptr_size);
3057 }
3058
3059 static int iscsit_send_r2t(
3060         struct iscsi_cmd *cmd,
3061         struct iscsi_conn *conn)
3062 {
3063         struct iscsi_r2t *r2t;
3064         struct iscsi_r2t_rsp *hdr;
3065         int ret;
3066
3067         r2t = iscsit_get_r2t_from_list(cmd);
3068         if (!r2t)
3069                 return -1;
3070
3071         hdr                     = (struct iscsi_r2t_rsp *) cmd->pdu;
3072         memset(hdr, 0, ISCSI_HDR_LEN);
3073         hdr->opcode             = ISCSI_OP_R2T;
3074         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3075         int_to_scsilun(cmd->se_cmd.orig_fe_lun,
3076                         (struct scsi_lun *)&hdr->lun);
3077         hdr->itt                = cmd->init_task_tag;
3078         if (conn->conn_transport->iscsit_get_r2t_ttt)
3079                 conn->conn_transport->iscsit_get_r2t_ttt(conn, cmd, r2t);
3080         else
3081                 r2t->targ_xfer_tag = session_get_next_ttt(conn->sess);
3082         hdr->ttt                = cpu_to_be32(r2t->targ_xfer_tag);
3083         hdr->statsn             = cpu_to_be32(conn->stat_sn);
3084         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3085         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3086         hdr->r2tsn              = cpu_to_be32(r2t->r2t_sn);
3087         hdr->data_offset        = cpu_to_be32(r2t->offset);
3088         hdr->data_length        = cpu_to_be32(r2t->xfer_len);
3089
3090         pr_debug("Built %sR2T, ITT: 0x%08x, TTT: 0x%08x, StatSN:"
3091                 " 0x%08x, R2TSN: 0x%08x, Offset: %u, DDTL: %u, CID: %hu\n",
3092                 (!r2t->recovery_r2t) ? "" : "Recovery ", cmd->init_task_tag,
3093                 r2t->targ_xfer_tag, ntohl(hdr->statsn), r2t->r2t_sn,
3094                         r2t->offset, r2t->xfer_len, conn->cid);
3095
3096         spin_lock_bh(&cmd->r2t_lock);
3097         r2t->sent_r2t = 1;
3098         spin_unlock_bh(&cmd->r2t_lock);
3099
3100         ret = conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3101         if (ret < 0) {
3102                 return ret;
3103         }
3104
3105         spin_lock_bh(&cmd->dataout_timeout_lock);
3106         iscsit_start_dataout_timer(cmd, conn);
3107         spin_unlock_bh(&cmd->dataout_timeout_lock);
3108
3109         return 0;
3110 }
3111
3112 /*
3113  *      @recovery: If called from iscsi_task_reassign_complete_write() for
3114  *              connection recovery.
3115  */
3116 int iscsit_build_r2ts_for_cmd(
3117         struct iscsi_conn *conn,
3118         struct iscsi_cmd *cmd,
3119         bool recovery)
3120 {
3121         int first_r2t = 1;
3122         u32 offset = 0, xfer_len = 0;
3123
3124         spin_lock_bh(&cmd->r2t_lock);
3125         if (cmd->cmd_flags & ICF_SENT_LAST_R2T) {
3126                 spin_unlock_bh(&cmd->r2t_lock);
3127                 return 0;
3128         }
3129
3130         if (conn->sess->sess_ops->DataSequenceInOrder &&
3131             !recovery)
3132                 cmd->r2t_offset = max(cmd->r2t_offset, cmd->write_data_done);
3133
3134         while (cmd->outstanding_r2ts < conn->sess->sess_ops->MaxOutstandingR2T) {
3135                 if (conn->sess->sess_ops->DataSequenceInOrder) {
3136                         offset = cmd->r2t_offset;
3137
3138                         if (first_r2t && recovery) {
3139                                 int new_data_end = offset +
3140                                         conn->sess->sess_ops->MaxBurstLength -
3141                                         cmd->next_burst_len;
3142
3143                                 if (new_data_end > cmd->se_cmd.data_length)
3144                                         xfer_len = cmd->se_cmd.data_length - offset;
3145                                 else
3146                                         xfer_len =
3147                                                 conn->sess->sess_ops->MaxBurstLength -
3148                                                 cmd->next_burst_len;
3149                         } else {
3150                                 int new_data_end = offset +
3151                                         conn->sess->sess_ops->MaxBurstLength;
3152
3153                                 if (new_data_end > cmd->se_cmd.data_length)
3154                                         xfer_len = cmd->se_cmd.data_length - offset;
3155                                 else
3156                                         xfer_len = conn->sess->sess_ops->MaxBurstLength;
3157                         }
3158                         cmd->r2t_offset += xfer_len;
3159
3160                         if (cmd->r2t_offset == cmd->se_cmd.data_length)
3161                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3162                 } else {
3163                         struct iscsi_seq *seq;
3164
3165                         seq = iscsit_get_seq_holder_for_r2t(cmd);
3166                         if (!seq) {
3167                                 spin_unlock_bh(&cmd->r2t_lock);
3168                                 return -1;
3169                         }
3170
3171                         offset = seq->offset;
3172                         xfer_len = seq->xfer_len;
3173
3174                         if (cmd->seq_send_order == cmd->seq_count)
3175                                 cmd->cmd_flags |= ICF_SENT_LAST_R2T;
3176                 }
3177                 cmd->outstanding_r2ts++;
3178                 first_r2t = 0;
3179
3180                 if (iscsit_add_r2t_to_list(cmd, offset, xfer_len, 0, 0) < 0) {
3181                         spin_unlock_bh(&cmd->r2t_lock);
3182                         return -1;
3183                 }
3184
3185                 if (cmd->cmd_flags & ICF_SENT_LAST_R2T)
3186                         break;
3187         }
3188         spin_unlock_bh(&cmd->r2t_lock);
3189
3190         return 0;
3191 }
3192 EXPORT_SYMBOL(iscsit_build_r2ts_for_cmd);
3193
3194 void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3195                         bool inc_stat_sn, struct iscsi_scsi_rsp *hdr)
3196 {
3197         if (inc_stat_sn)
3198                 cmd->stat_sn = conn->stat_sn++;
3199
3200         atomic_long_inc(&conn->sess->rsp_pdus);
3201
3202         memset(hdr, 0, ISCSI_HDR_LEN);
3203         hdr->opcode             = ISCSI_OP_SCSI_CMD_RSP;
3204         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3205         if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
3206                 hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
3207                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3208         } else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
3209                 hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
3210                 hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
3211         }
3212         hdr->response           = cmd->iscsi_response;
3213         hdr->cmd_status         = cmd->se_cmd.scsi_status;
3214         hdr->itt                = cmd->init_task_tag;
3215         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3216
3217         iscsit_increment_maxcmdsn(cmd, conn->sess);
3218         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3219         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3220
3221         pr_debug("Built SCSI Response, ITT: 0x%08x, StatSN: 0x%08x,"
3222                 " Response: 0x%02x, SAM Status: 0x%02x, CID: %hu\n",
3223                 cmd->init_task_tag, cmd->stat_sn, cmd->se_cmd.scsi_status,
3224                 cmd->se_cmd.scsi_status, conn->cid);
3225 }
3226 EXPORT_SYMBOL(iscsit_build_rsp_pdu);
3227
3228 static int iscsit_send_response(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3229 {
3230         struct iscsi_scsi_rsp *hdr = (struct iscsi_scsi_rsp *)&cmd->pdu[0];
3231         bool inc_stat_sn = (cmd->i_state == ISTATE_SEND_STATUS);
3232         void *data_buf = NULL;
3233         u32 padding = 0, data_buf_len = 0;
3234
3235         iscsit_build_rsp_pdu(cmd, conn, inc_stat_sn, hdr);
3236
3237         /*
3238          * Attach SENSE DATA payload to iSCSI Response PDU
3239          */
3240         if (cmd->se_cmd.sense_buffer &&
3241            ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
3242             (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) {
3243                 put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer);
3244                 cmd->se_cmd.scsi_sense_length += sizeof (__be16);
3245
3246                 padding         = -(cmd->se_cmd.scsi_sense_length) & 3;
3247                 hton24(hdr->dlength, (u32)cmd->se_cmd.scsi_sense_length);
3248                 data_buf = cmd->sense_buffer;
3249                 data_buf_len = cmd->se_cmd.scsi_sense_length + padding;
3250
3251                 if (padding) {
3252                         memset(cmd->sense_buffer +
3253                                 cmd->se_cmd.scsi_sense_length, 0, padding);
3254                         pr_debug("Adding %u bytes of padding to"
3255                                 " SENSE.\n", padding);
3256                 }
3257
3258                 pr_debug("Attaching SENSE DATA: %u bytes to iSCSI"
3259                                 " Response PDU\n",
3260                                 cmd->se_cmd.scsi_sense_length);
3261         }
3262
3263         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, data_buf,
3264                                                      data_buf_len);
3265 }
3266
3267 static u8 iscsit_convert_tcm_tmr_rsp(struct se_tmr_req *se_tmr)
3268 {
3269         switch (se_tmr->response) {
3270         case TMR_FUNCTION_COMPLETE:
3271                 return ISCSI_TMF_RSP_COMPLETE;
3272         case TMR_TASK_DOES_NOT_EXIST:
3273                 return ISCSI_TMF_RSP_NO_TASK;
3274         case TMR_LUN_DOES_NOT_EXIST:
3275                 return ISCSI_TMF_RSP_NO_LUN;
3276         case TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED:
3277                 return ISCSI_TMF_RSP_NOT_SUPPORTED;
3278         case TMR_FUNCTION_REJECTED:
3279         default:
3280                 return ISCSI_TMF_RSP_REJECTED;
3281         }
3282 }
3283
3284 void
3285 iscsit_build_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3286                           struct iscsi_tm_rsp *hdr)
3287 {
3288         struct se_tmr_req *se_tmr = cmd->se_cmd.se_tmr_req;
3289
3290         hdr->opcode             = ISCSI_OP_SCSI_TMFUNC_RSP;
3291         hdr->flags              = ISCSI_FLAG_CMD_FINAL;
3292         hdr->response           = iscsit_convert_tcm_tmr_rsp(se_tmr);
3293         hdr->itt                = cmd->init_task_tag;
3294         cmd->stat_sn            = conn->stat_sn++;
3295         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3296
3297         iscsit_increment_maxcmdsn(cmd, conn->sess);
3298         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3299         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3300
3301         pr_debug("Built Task Management Response ITT: 0x%08x,"
3302                 " StatSN: 0x%08x, Response: 0x%02x, CID: %hu\n",
3303                 cmd->init_task_tag, cmd->stat_sn, hdr->response, conn->cid);
3304 }
3305 EXPORT_SYMBOL(iscsit_build_task_mgt_rsp);
3306
3307 static int
3308 iscsit_send_task_mgt_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn)
3309 {
3310         struct iscsi_tm_rsp *hdr = (struct iscsi_tm_rsp *)&cmd->pdu[0];
3311
3312         iscsit_build_task_mgt_rsp(cmd, conn, hdr);
3313
3314         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL, NULL, 0);
3315 }
3316
3317 static bool iscsit_check_inaddr_any(struct iscsi_np *np)
3318 {
3319         bool ret = false;
3320
3321         if (np->np_sockaddr.ss_family == AF_INET6) {
3322                 const struct sockaddr_in6 sin6 = {
3323                         .sin6_addr = IN6ADDR_ANY_INIT };
3324                 struct sockaddr_in6 *sock_in6 =
3325                          (struct sockaddr_in6 *)&np->np_sockaddr;
3326
3327                 if (!memcmp(sock_in6->sin6_addr.s6_addr,
3328                                 sin6.sin6_addr.s6_addr, 16))
3329                         ret = true;
3330         } else {
3331                 struct sockaddr_in * sock_in =
3332                         (struct sockaddr_in *)&np->np_sockaddr;
3333
3334                 if (sock_in->sin_addr.s_addr == htonl(INADDR_ANY))
3335                         ret = true;
3336         }
3337
3338         return ret;
3339 }
3340
3341 #define SENDTARGETS_BUF_LIMIT 32768U
3342
3343 static int
3344 iscsit_build_sendtargets_response(struct iscsi_cmd *cmd,
3345                                   enum iscsit_transport_type network_transport,
3346                                   int skip_bytes, bool *completed)
3347 {
3348         char *payload = NULL;
3349         struct iscsi_conn *conn = cmd->conn;
3350         struct iscsi_portal_group *tpg;
3351         struct iscsi_tiqn *tiqn;
3352         struct iscsi_tpg_np *tpg_np;
3353         int buffer_len, end_of_buf = 0, len = 0, payload_len = 0;
3354         int target_name_printed;
3355         unsigned char buf[ISCSI_IQN_LEN+12]; /* iqn + "TargetName=" + \0 */
3356         unsigned char *text_in = cmd->text_in_ptr, *text_ptr = NULL;
3357         bool active;
3358
3359         buffer_len = min(conn->conn_ops->MaxRecvDataSegmentLength,
3360                          SENDTARGETS_BUF_LIMIT);
3361
3362         payload = kzalloc(buffer_len, GFP_KERNEL);
3363         if (!payload) {
3364                 pr_err("Unable to allocate memory for sendtargets"
3365                                 " response.\n");
3366                 return -ENOMEM;
3367         }
3368         /*
3369          * Locate pointer to iqn./eui. string for ICF_SENDTARGETS_SINGLE
3370          * explicit case..
3371          */
3372         if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) {
3373                 text_ptr = strchr(text_in, '=');
3374                 if (!text_ptr) {
3375                         pr_err("Unable to locate '=' string in text_in:"
3376                                " %s\n", text_in);
3377                         kfree(payload);
3378                         return -EINVAL;
3379                 }
3380                 /*
3381                  * Skip over '=' character..
3382                  */
3383                 text_ptr += 1;
3384         }
3385
3386         spin_lock(&tiqn_lock);
3387         list_for_each_entry(tiqn, &g_tiqn_list, tiqn_list) {
3388                 if ((cmd->cmd_flags & ICF_SENDTARGETS_SINGLE) &&
3389                      strcmp(tiqn->tiqn, text_ptr)) {
3390                         continue;
3391                 }
3392
3393                 target_name_printed = 0;
3394
3395                 spin_lock(&tiqn->tiqn_tpg_lock);
3396                 list_for_each_entry(tpg, &tiqn->tiqn_tpg_list, tpg_list) {
3397
3398                         /* If demo_mode_discovery=0 and generate_node_acls=0
3399                          * (demo mode dislabed) do not return
3400                          * TargetName+TargetAddress unless a NodeACL exists.
3401                          */
3402
3403                         if ((tpg->tpg_attrib.generate_node_acls == 0) &&
3404                             (tpg->tpg_attrib.demo_mode_discovery == 0) &&
3405                             (!target_tpg_has_node_acl(&tpg->tpg_se_tpg,
3406                                 cmd->conn->sess->sess_ops->InitiatorName))) {
3407                                 continue;
3408                         }
3409
3410                         spin_lock(&tpg->tpg_state_lock);
3411                         active = (tpg->tpg_state == TPG_STATE_ACTIVE);
3412                         spin_unlock(&tpg->tpg_state_lock);
3413
3414                         if (!active && tpg->tpg_attrib.tpg_enabled_sendtargets)
3415                                 continue;
3416
3417                         spin_lock(&tpg->tpg_np_lock);
3418                         list_for_each_entry(tpg_np, &tpg->tpg_gnp_list,
3419                                                 tpg_np_list) {
3420                                 struct iscsi_np *np = tpg_np->tpg_np;
3421                                 bool inaddr_any = iscsit_check_inaddr_any(np);
3422                                 struct sockaddr_storage *sockaddr;
3423
3424                                 if (np->np_network_transport != network_transport)
3425                                         continue;
3426
3427                                 if (!target_name_printed) {
3428                                         len = sprintf(buf, "TargetName=%s",
3429                                                       tiqn->tiqn);
3430                                         len += 1;
3431
3432                                         if ((len + payload_len) > buffer_len) {
3433                                                 spin_unlock(&tpg->tpg_np_lock);
3434                                                 spin_unlock(&tiqn->tiqn_tpg_lock);
3435                                                 end_of_buf = 1;
3436                                                 goto eob;
3437                                         }
3438
3439                                         if (skip_bytes && len <= skip_bytes) {
3440                                                 skip_bytes -= len;
3441                                         } else {
3442                                                 memcpy(payload + payload_len, buf, len);
3443                                                 payload_len += len;
3444                                                 target_name_printed = 1;
3445                                                 if (len > skip_bytes)
3446                                                         skip_bytes = 0;
3447                                         }
3448                                 }
3449
3450                                 if (inaddr_any)
3451                                         sockaddr = &conn->local_sockaddr;
3452                                 else
3453                                         sockaddr = &np->np_sockaddr;
3454
3455                                 len = sprintf(buf, "TargetAddress="
3456                                               "%pISpc,%hu",
3457                                               sockaddr,
3458                                               tpg->tpgt);
3459                                 len += 1;
3460
3461                                 if ((len + payload_len) > buffer_len) {
3462                                         spin_unlock(&tpg->tpg_np_lock);
3463                                         spin_unlock(&tiqn->tiqn_tpg_lock);
3464                                         end_of_buf = 1;
3465                                         goto eob;
3466                                 }
3467
3468                                 if (skip_bytes && len <= skip_bytes) {
3469                                         skip_bytes -= len;
3470                                 } else {
3471                                         memcpy(payload + payload_len, buf, len);
3472                                         payload_len += len;
3473                                         if (len > skip_bytes)
3474                                                 skip_bytes = 0;
3475                                 }
3476                         }
3477                         spin_unlock(&tpg->tpg_np_lock);
3478                 }
3479                 spin_unlock(&tiqn->tiqn_tpg_lock);
3480 eob:
3481                 if (end_of_buf) {
3482                         *completed = false;
3483                         break;
3484                 }
3485
3486                 if (cmd->cmd_flags & ICF_SENDTARGETS_SINGLE)
3487                         break;
3488         }
3489         spin_unlock(&tiqn_lock);
3490
3491         cmd->buf_ptr = payload;
3492
3493         return payload_len;
3494 }
3495
3496 int
3497 iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3498                       struct iscsi_text_rsp *hdr,
3499                       enum iscsit_transport_type network_transport)
3500 {
3501         int text_length, padding;
3502         bool completed = true;
3503
3504         text_length = iscsit_build_sendtargets_response(cmd, network_transport,
3505                                                         cmd->read_data_done,
3506                                                         &completed);
3507         if (text_length < 0)
3508                 return text_length;
3509
3510         if (completed) {
3511                 hdr->flags |= ISCSI_FLAG_CMD_FINAL;
3512         } else {
3513                 hdr->flags |= ISCSI_FLAG_TEXT_CONTINUE;
3514                 cmd->read_data_done += text_length;
3515                 if (cmd->targ_xfer_tag == 0xFFFFFFFF)
3516                         cmd->targ_xfer_tag = session_get_next_ttt(conn->sess);
3517         }
3518         hdr->opcode = ISCSI_OP_TEXT_RSP;
3519         padding = ((-text_length) & 3);
3520         hton24(hdr->dlength, text_length);
3521         hdr->itt = cmd->init_task_tag;
3522         hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
3523         cmd->stat_sn = conn->stat_sn++;
3524         hdr->statsn = cpu_to_be32(cmd->stat_sn);
3525
3526         iscsit_increment_maxcmdsn(cmd, conn->sess);
3527         /*
3528          * Reset maxcmdsn_inc in multi-part text payload exchanges to
3529          * correctly increment MaxCmdSN for each response answering a
3530          * non immediate text request with a valid CmdSN.
3531          */
3532         cmd->maxcmdsn_inc = 0;
3533         hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
3534         hdr->max_cmdsn = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3535
3536         pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x,"
3537                 " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag,
3538                 cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid,
3539                 !!(hdr->flags & ISCSI_FLAG_CMD_FINAL),
3540                 !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE));
3541
3542         return text_length + padding;
3543 }
3544 EXPORT_SYMBOL(iscsit_build_text_rsp);
3545
3546 static int iscsit_send_text_rsp(
3547         struct iscsi_cmd *cmd,
3548         struct iscsi_conn *conn)
3549 {
3550         struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
3551         int text_length;
3552
3553         text_length = iscsit_build_text_rsp(cmd, conn, hdr,
3554                                 conn->conn_transport->transport_type);
3555         if (text_length < 0)
3556                 return text_length;
3557
3558         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3559                                                      cmd->buf_ptr,
3560                                                      text_length);
3561 }
3562
3563 void
3564 iscsit_build_reject(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
3565                     struct iscsi_reject *hdr)
3566 {
3567         hdr->opcode             = ISCSI_OP_REJECT;
3568         hdr->reason             = cmd->reject_reason;
3569         hdr->flags              |= ISCSI_FLAG_CMD_FINAL;
3570         hton24(hdr->dlength, ISCSI_HDR_LEN);
3571         hdr->ffffffff           = cpu_to_be32(0xffffffff);
3572         cmd->stat_sn            = conn->stat_sn++;
3573         hdr->statsn             = cpu_to_be32(cmd->stat_sn);
3574         hdr->exp_cmdsn          = cpu_to_be32(conn->sess->exp_cmd_sn);
3575         hdr->max_cmdsn          = cpu_to_be32((u32) atomic_read(&conn->sess->max_cmd_sn));
3576
3577 }
3578 EXPORT_SYMBOL(iscsit_build_reject);
3579
3580 static int iscsit_send_reject(
3581         struct iscsi_cmd *cmd,
3582         struct iscsi_conn *conn)
3583 {
3584         struct iscsi_reject *hdr = (struct iscsi_reject *)&cmd->pdu[0];
3585
3586         iscsit_build_reject(cmd, conn, hdr);
3587
3588         pr_debug("Built Reject PDU StatSN: 0x%08x, Reason: 0x%02x,"
3589                 " CID: %hu\n", ntohl(hdr->statsn), hdr->reason, conn->cid);
3590
3591         return conn->conn_transport->iscsit_xmit_pdu(conn, cmd, NULL,
3592                                                      cmd->buf_ptr,
3593                                                      ISCSI_HDR_LEN);
3594 }
3595
3596 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
3597 {
3598         int ord, cpu;
3599         /*
3600          * bitmap_id is assigned from iscsit_global->ts_bitmap from
3601          * within iscsit_start_kthreads()
3602          *
3603          * Here we use bitmap_id to determine which CPU that this
3604          * iSCSI connection's RX/TX threads will be scheduled to
3605          * execute upon.
3606          */
3607         ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
3608         for_each_online_cpu(cpu) {
3609                 if (ord-- == 0) {
3610                         cpumask_set_cpu(cpu, conn->conn_cpumask);
3611                         return;
3612                 }
3613         }
3614         /*
3615          * This should never be reached..
3616          */
3617         dump_stack();
3618         cpumask_setall(conn->conn_cpumask);
3619 }
3620
3621 int
3622 iscsit_immediate_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3623 {
3624         int ret;
3625
3626         switch (state) {
3627         case ISTATE_SEND_R2T:
3628                 ret = iscsit_send_r2t(cmd, conn);
3629                 if (ret < 0)
3630                         goto err;
3631                 break;
3632         case ISTATE_REMOVE:
3633                 spin_lock_bh(&conn->cmd_lock);
3634                 list_del_init(&cmd->i_conn_node);
3635                 spin_unlock_bh(&conn->cmd_lock);
3636
3637                 iscsit_free_cmd(cmd, false);
3638                 break;
3639         case ISTATE_SEND_NOPIN_WANT_RESPONSE:
3640                 iscsit_mod_nopin_response_timer(conn);
3641                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 1);
3642                 if (ret < 0)
3643                         goto err;
3644                 break;
3645         case ISTATE_SEND_NOPIN_NO_RESPONSE:
3646                 ret = iscsit_send_unsolicited_nopin(cmd, conn, 0);
3647                 if (ret < 0)
3648                         goto err;
3649                 break;
3650         default:
3651                 pr_err("Unknown Opcode: 0x%02x ITT:"
3652                        " 0x%08x, i_state: %d on CID: %hu\n",
3653                        cmd->iscsi_opcode, cmd->init_task_tag, state,
3654                        conn->cid);
3655                 goto err;
3656         }
3657
3658         return 0;
3659
3660 err:
3661         return -1;
3662 }
3663 EXPORT_SYMBOL(iscsit_immediate_queue);
3664
3665 static int
3666 iscsit_handle_immediate_queue(struct iscsi_conn *conn)
3667 {
3668         struct iscsit_transport *t = conn->conn_transport;
3669         struct iscsi_queue_req *qr;
3670         struct iscsi_cmd *cmd;
3671         u8 state;
3672         int ret;
3673
3674         while ((qr = iscsit_get_cmd_from_immediate_queue(conn))) {
3675                 atomic_set(&conn->check_immediate_queue, 0);
3676                 cmd = qr->cmd;
3677                 state = qr->state;
3678                 kmem_cache_free(lio_qr_cache, qr);
3679
3680                 ret = t->iscsit_immediate_queue(conn, cmd, state);
3681                 if (ret < 0)
3682                         return ret;
3683         }
3684
3685         return 0;
3686 }
3687
3688 int
3689 iscsit_response_queue(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int state)
3690 {
3691         int ret;
3692
3693 check_rsp_state:
3694         switch (state) {
3695         case ISTATE_SEND_DATAIN:
3696                 ret = iscsit_send_datain(cmd, conn);
3697                 if (ret < 0)
3698                         goto err;
3699                 else if (!ret)
3700                         /* more drs */
3701                         goto check_rsp_state;
3702                 else if (ret == 1) {
3703                         /* all done */
3704                         spin_lock_bh(&cmd->istate_lock);
3705                         cmd->i_state = ISTATE_SENT_STATUS;
3706                         spin_unlock_bh(&cmd->istate_lock);
3707
3708                         if (atomic_read(&conn->check_immediate_queue))
3709                                 return 1;
3710
3711                         return 0;
3712                 } else if (ret == 2) {
3713                         /* Still must send status,
3714                            SCF_TRANSPORT_TASK_SENSE was set */
3715                         spin_lock_bh(&cmd->istate_lock);
3716                         cmd->i_state = ISTATE_SEND_STATUS;
3717                         spin_unlock_bh(&cmd->istate_lock);
3718                         state = ISTATE_SEND_STATUS;
3719                         goto check_rsp_state;
3720                 }
3721
3722                 break;
3723         case ISTATE_SEND_STATUS:
3724         case ISTATE_SEND_STATUS_RECOVERY:
3725                 ret = iscsit_send_response(cmd, conn);
3726                 break;
3727         case ISTATE_SEND_LOGOUTRSP:
3728                 ret = iscsit_send_logout(cmd, conn);
3729                 break;
3730         case ISTATE_SEND_ASYNCMSG:
3731                 ret = iscsit_send_conn_drop_async_message(
3732                         cmd, conn);
3733                 break;
3734         case ISTATE_SEND_NOPIN:
3735                 ret = iscsit_send_nopin(cmd, conn);
3736                 break;
3737         case ISTATE_SEND_REJECT:
3738                 ret = iscsit_send_reject(cmd, conn);
3739                 break;
3740         case ISTATE_SEND_TASKMGTRSP:
3741                 ret = iscsit_send_task_mgt_rsp(cmd, conn);
3742                 if (ret != 0)
3743                         break;
3744                 ret = iscsit_tmr_post_handler(cmd, conn);
3745                 if (ret != 0)
3746                         iscsit_fall_back_to_erl0(conn->sess);
3747                 break;
3748         case ISTATE_SEND_TEXTRSP:
3749                 ret = iscsit_send_text_rsp(cmd, conn);
3750                 break;
3751         default:
3752                 pr_err("Unknown Opcode: 0x%02x ITT:"
3753                        " 0x%08x, i_state: %d on CID: %hu\n",
3754                        cmd->iscsi_opcode, cmd->init_task_tag,
3755                        state, conn->cid);
3756                 goto err;
3757         }
3758         if (ret < 0)
3759                 goto err;
3760
3761         switch (state) {
3762         case ISTATE_SEND_LOGOUTRSP:
3763                 if (!iscsit_logout_post_handler(cmd, conn))
3764                         return -ECONNRESET;
3765                 /* fall through */
3766         case ISTATE_SEND_STATUS:
3767         case ISTATE_SEND_ASYNCMSG:
3768         case ISTATE_SEND_NOPIN:
3769         case ISTATE_SEND_STATUS_RECOVERY:
3770         case ISTATE_SEND_TEXTRSP:
3771         case ISTATE_SEND_TASKMGTRSP:
3772         case ISTATE_SEND_REJECT:
3773                 spin_lock_bh(&cmd->istate_lock);
3774                 cmd->i_state = ISTATE_SENT_STATUS;
3775                 spin_unlock_bh(&cmd->istate_lock);
3776                 break;
3777         default:
3778                 pr_err("Unknown Opcode: 0x%02x ITT:"
3779                        " 0x%08x, i_state: %d on CID: %hu\n",
3780                        cmd->iscsi_opcode, cmd->init_task_tag,
3781                        cmd->i_state, conn->cid);
3782                 goto err;
3783         }
3784
3785         if (atomic_read(&conn->check_immediate_queue))
3786                 return 1;
3787
3788         return 0;
3789
3790 err:
3791         return -1;
3792 }
3793 EXPORT_SYMBOL(iscsit_response_queue);
3794
3795 static int iscsit_handle_response_queue(struct iscsi_conn *conn)
3796 {
3797         struct iscsit_transport *t = conn->conn_transport;
3798         struct iscsi_queue_req *qr;
3799         struct iscsi_cmd *cmd;
3800         u8 state;
3801         int ret;
3802
3803         while ((qr = iscsit_get_cmd_from_response_queue(conn))) {
3804                 cmd = qr->cmd;
3805                 state = qr->state;
3806                 kmem_cache_free(lio_qr_cache, qr);
3807
3808                 ret = t->iscsit_response_queue(conn, cmd, state);
3809                 if (ret == 1 || ret < 0)
3810                         return ret;
3811         }
3812
3813         return 0;
3814 }
3815
3816 int iscsi_target_tx_thread(void *arg)
3817 {
3818         int ret = 0;
3819         struct iscsi_conn *conn = arg;
3820         bool conn_freed = false;
3821
3822         /*
3823          * Allow ourselves to be interrupted by SIGINT so that a
3824          * connection recovery / failure event can be triggered externally.
3825          */
3826         allow_signal(SIGINT);
3827
3828         while (!kthread_should_stop()) {
3829                 /*
3830                  * Ensure that both TX and RX per connection kthreads
3831                  * are scheduled to run on the same CPU.
3832                  */
3833                 iscsit_thread_check_cpumask(conn, current, 1);
3834
3835                 wait_event_interruptible(conn->queues_wq,
3836                                          !iscsit_conn_all_queues_empty(conn));
3837
3838                 if (signal_pending(current))
3839                         goto transport_err;
3840
3841 get_immediate:
3842                 ret = iscsit_handle_immediate_queue(conn);
3843                 if (ret < 0)
3844                         goto transport_err;
3845
3846                 ret = iscsit_handle_response_queue(conn);
3847                 if (ret == 1) {
3848                         goto get_immediate;
3849                 } else if (ret == -ECONNRESET) {
3850                         conn_freed = true;
3851                         goto out;
3852                 } else if (ret < 0) {
3853                         goto transport_err;
3854                 }
3855         }
3856
3857 transport_err:
3858         /*
3859          * Avoid the normal connection failure code-path if this connection
3860          * is still within LOGIN mode, and iscsi_np process context is
3861          * responsible for cleaning up the early connection failure.
3862          */
3863         if (conn->conn_state != TARG_CONN_STATE_IN_LOGIN)
3864                 iscsit_take_action_for_connection_exit(conn, &conn_freed);
3865 out:
3866         if (!conn_freed) {
3867                 while (!kthread_should_stop()) {
3868                         msleep(100);
3869                 }
3870         }
3871         return 0;
3872 }
3873
3874 static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf)
3875 {
3876         struct iscsi_hdr *hdr = (struct iscsi_hdr *)buf;
3877         struct iscsi_cmd *cmd;
3878         int ret = 0;
3879
3880         switch (hdr->opcode & ISCSI_OPCODE_MASK) {
3881         case ISCSI_OP_SCSI_CMD:
3882                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3883                 if (!cmd)
3884                         goto reject;
3885
3886                 ret = iscsit_handle_scsi_cmd(conn, cmd, buf);
3887                 break;
3888         case ISCSI_OP_SCSI_DATA_OUT:
3889                 ret = iscsit_handle_data_out(conn, buf);
3890                 break;
3891         case ISCSI_OP_NOOP_OUT:
3892                 cmd = NULL;
3893                 if (hdr->ttt == cpu_to_be32(0xFFFFFFFF)) {
3894                         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3895                         if (!cmd)
3896                                 goto reject;
3897                 }
3898                 ret = iscsit_handle_nop_out(conn, cmd, buf);
3899                 break;
3900         case ISCSI_OP_SCSI_TMFUNC:
3901                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3902                 if (!cmd)
3903                         goto reject;
3904
3905                 ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf);
3906                 break;
3907         case ISCSI_OP_TEXT:
3908                 if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) {
3909                         cmd = iscsit_find_cmd_from_itt(conn, hdr->itt);
3910                         if (!cmd)
3911                                 goto reject;
3912                 } else {
3913                         cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3914                         if (!cmd)
3915                                 goto reject;
3916                 }
3917
3918                 ret = iscsit_handle_text_cmd(conn, cmd, buf);
3919                 break;
3920         case ISCSI_OP_LOGOUT:
3921                 cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE);
3922                 if (!cmd)
3923                         goto reject;
3924
3925                 ret = iscsit_handle_logout_cmd(conn, cmd, buf);
3926                 if (ret > 0)
3927                         wait_for_completion_timeout(&conn->conn_logout_comp,
3928                                         SECONDS_FOR_LOGOUT_COMP * HZ);
3929                 break;
3930         case ISCSI_OP_SNACK:
3931                 ret = iscsit_handle_snack(conn, buf);
3932                 break;
3933         default:
3934                 pr_err("Got unknown iSCSI OpCode: 0x%02x\n", hdr->opcode);
3935                 if (!conn->sess->sess_ops->ErrorRecoveryLevel) {
3936                         pr_err("Cannot recover from unknown"
3937                         " opcode while ERL=0, closing iSCSI connection.\n");
3938                         return -1;
3939                 }
3940                 pr_err("Unable to recover from unknown opcode while OFMarker=No,"
3941                        " closing iSCSI connection.\n");
3942                 ret = -1;
3943                 break;
3944         }
3945
3946         return ret;
3947 reject:
3948         return iscsit_add_reject(conn, ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
3949 }
3950
3951 static bool iscsi_target_check_conn_state(struct iscsi_conn *conn)
3952 {
3953         bool ret;
3954
3955         spin_lock_bh(&conn->state_lock);
3956         ret = (conn->conn_state != TARG_CONN_STATE_LOGGED_IN);
3957         spin_unlock_bh(&conn->state_lock);
3958
3959         return ret;
3960 }
3961
3962 static void iscsit_get_rx_pdu(struct iscsi_conn *conn)
3963 {
3964         int ret;
3965         u8 *buffer, opcode;
3966         u32 checksum = 0, digest = 0;
3967         struct kvec iov;
3968
3969         buffer = kcalloc(ISCSI_HDR_LEN, sizeof(*buffer), GFP_KERNEL);
3970         if (!buffer)
3971                 return;
3972
3973         while (!kthread_should_stop()) {
3974                 /*
3975                  * Ensure that both TX and RX per connection kthreads
3976                  * are scheduled to run on the same CPU.
3977                  */
3978                 iscsit_thread_check_cpumask(conn, current, 0);
3979
3980                 memset(&iov, 0, sizeof(struct kvec));
3981
3982                 iov.iov_base    = buffer;
3983                 iov.iov_len     = ISCSI_HDR_LEN;
3984
3985                 ret = rx_data(conn, &iov, 1, ISCSI_HDR_LEN);
3986                 if (ret != ISCSI_HDR_LEN) {
3987                         iscsit_rx_thread_wait_for_tcp(conn);
3988                         break;
3989                 }
3990
3991                 if (conn->conn_ops->HeaderDigest) {
3992                         iov.iov_base    = &digest;
3993                         iov.iov_len     = ISCSI_CRC_LEN;
3994
3995                         ret = rx_data(conn, &iov, 1, ISCSI_CRC_LEN);
3996                         if (ret != ISCSI_CRC_LEN) {
3997                                 iscsit_rx_thread_wait_for_tcp(conn);
3998                                 break;
3999                         }
4000
4001                         iscsit_do_crypto_hash_buf(conn->conn_rx_hash,
4002                                         buffer, ISCSI_HDR_LEN,
4003                                         0, NULL, (u8 *)&checksum);
4004
4005                         if (digest != checksum) {
4006                                 pr_err("HeaderDigest CRC32C failed,"
4007                                         " received 0x%08x, computed 0x%08x\n",
4008                                         digest, checksum);
4009                                 /*
4010                                  * Set the PDU to 0xff so it will intentionally
4011                                  * hit default in the switch below.
4012                                  */
4013                                 memset(buffer, 0xff, ISCSI_HDR_LEN);
4014                                 atomic_long_inc(&conn->sess->conn_digest_errors);
4015                         } else {
4016                                 pr_debug("Got HeaderDigest CRC32C"
4017                                                 " 0x%08x\n", checksum);
4018                         }
4019                 }
4020
4021                 if (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT)
4022                         break;
4023
4024                 opcode = buffer[0] & ISCSI_OPCODE_MASK;
4025
4026                 if (conn->sess->sess_ops->SessionType &&
4027                    ((!(opcode & ISCSI_OP_TEXT)) ||
4028                     (!(opcode & ISCSI_OP_LOGOUT)))) {
4029                         pr_err("Received illegal iSCSI Opcode: 0x%02x"
4030                         " while in Discovery Session, rejecting.\n", opcode);
4031                         iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
4032                                           buffer);
4033                         break;
4034                 }
4035
4036                 ret = iscsi_target_rx_opcode(conn, buffer);
4037                 if (ret < 0)
4038                         break;
4039         }
4040
4041         kfree(buffer);
4042 }
4043
4044 int iscsi_target_rx_thread(void *arg)
4045 {
4046         int rc;
4047         struct iscsi_conn *conn = arg;
4048         bool conn_freed = false;
4049
4050         /*
4051          * Allow ourselves to be interrupted by SIGINT so that a
4052          * connection recovery / failure event can be triggered externally.
4053          */
4054         allow_signal(SIGINT);
4055         /*
4056          * Wait for iscsi_post_login_handler() to complete before allowing
4057          * incoming iscsi/tcp socket I/O, and/or failing the connection.
4058          */
4059         rc = wait_for_completion_interruptible(&conn->rx_login_comp);
4060         if (rc < 0 || iscsi_target_check_conn_state(conn))
4061                 goto out;
4062
4063         if (!conn->conn_transport->iscsit_get_rx_pdu)
4064                 return 0;
4065
4066         conn->conn_transport->iscsit_get_rx_pdu(conn);
4067
4068         if (!signal_pending(current))
4069                 atomic_set(&conn->transport_failed, 1);
4070         iscsit_take_action_for_connection_exit(conn, &conn_freed);
4071
4072 out:
4073         if (!conn_freed) {
4074                 while (!kthread_should_stop()) {
4075                         msleep(100);
4076                 }
4077         }
4078
4079         return 0;
4080 }
4081
4082 static void iscsit_release_commands_from_conn(struct iscsi_conn *conn)
4083 {
4084         LIST_HEAD(tmp_list);
4085         struct iscsi_cmd *cmd = NULL, *cmd_tmp = NULL;
4086         struct iscsi_session *sess = conn->sess;
4087         /*
4088          * We expect this function to only ever be called from either RX or TX
4089          * thread context via iscsit_close_connection() once the other context
4090          * has been reset -> returned sleeping pre-handler state.
4091          */
4092         spin_lock_bh(&conn->cmd_lock);
4093         list_splice_init(&conn->conn_cmd_list, &tmp_list);
4094
4095         list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4096                 struct se_cmd *se_cmd = &cmd->se_cmd;
4097
4098                 if (se_cmd->se_tfo != NULL) {
4099                         spin_lock_irq(&se_cmd->t_state_lock);
4100                         if (se_cmd->transport_state & CMD_T_ABORTED) {
4101                                 /*
4102                                  * LIO's abort path owns the cleanup for this,
4103                                  * so put it back on the list and let
4104                                  * aborted_task handle it.
4105                                  */
4106                                 list_move_tail(&cmd->i_conn_node,
4107                                                &conn->conn_cmd_list);
4108                         } else {
4109                                 se_cmd->transport_state |= CMD_T_FABRIC_STOP;
4110                         }
4111                         spin_unlock_irq(&se_cmd->t_state_lock);
4112                 }
4113         }
4114         spin_unlock_bh(&conn->cmd_lock);
4115
4116         list_for_each_entry_safe(cmd, cmd_tmp, &tmp_list, i_conn_node) {
4117                 list_del_init(&cmd->i_conn_node);
4118
4119                 iscsit_increment_maxcmdsn(cmd, sess);
4120                 iscsit_free_cmd(cmd, true);
4121
4122         }
4123 }
4124
4125 static void iscsit_stop_timers_for_cmds(
4126         struct iscsi_conn *conn)
4127 {
4128         struct iscsi_cmd *cmd;
4129
4130         spin_lock_bh(&conn->cmd_lock);
4131         list_for_each_entry(cmd, &conn->conn_cmd_list, i_conn_node) {
4132                 if (cmd->data_direction == DMA_TO_DEVICE)
4133                         iscsit_stop_dataout_timer(cmd);
4134         }
4135         spin_unlock_bh(&conn->cmd_lock);
4136 }
4137
4138 int iscsit_close_connection(
4139         struct iscsi_conn *conn)
4140 {
4141         int conn_logout = (conn->conn_state == TARG_CONN_STATE_IN_LOGOUT);
4142         struct iscsi_session    *sess = conn->sess;
4143
4144         pr_debug("Closing iSCSI connection CID %hu on SID:"
4145                 " %u\n", conn->cid, sess->sid);
4146         /*
4147          * Always up conn_logout_comp for the traditional TCP and HW_OFFLOAD
4148          * case just in case the RX Thread in iscsi_target_rx_opcode() is
4149          * sleeping and the logout response never got sent because the
4150          * connection failed.
4151          *
4152          * However for iser-target, isert_wait4logout() is using conn_logout_comp
4153          * to signal logout response TX interrupt completion.  Go ahead and skip
4154          * this for iser since isert_rx_opcode() does not wait on logout failure,
4155          * and to avoid iscsi_conn pointer dereference in iser-target code.
4156          */
4157         if (!conn->conn_transport->rdma_shutdown)
4158                 complete(&conn->conn_logout_comp);
4159
4160         if (!strcmp(current->comm, ISCSI_RX_THREAD_NAME)) {
4161                 if (conn->tx_thread &&
4162                     cmpxchg(&conn->tx_thread_active, true, false)) {
4163                         send_sig(SIGINT, conn->tx_thread, 1);
4164                         kthread_stop(conn->tx_thread);
4165                 }
4166         } else if (!strcmp(current->comm, ISCSI_TX_THREAD_NAME)) {
4167                 if (conn->rx_thread &&
4168                     cmpxchg(&conn->rx_thread_active, true, false)) {
4169                         send_sig(SIGINT, conn->rx_thread, 1);
4170                         kthread_stop(conn->rx_thread);
4171                 }
4172         }
4173
4174         spin_lock(&iscsit_global->ts_bitmap_lock);
4175         bitmap_release_region(iscsit_global->ts_bitmap, conn->bitmap_id,
4176                               get_order(1));
4177         spin_unlock(&iscsit_global->ts_bitmap_lock);
4178
4179         iscsit_stop_timers_for_cmds(conn);
4180         iscsit_stop_nopin_response_timer(conn);
4181         iscsit_stop_nopin_timer(conn);
4182
4183         if (conn->conn_transport->iscsit_wait_conn)
4184                 conn->conn_transport->iscsit_wait_conn(conn);
4185
4186         /*
4187          * During Connection recovery drop unacknowledged out of order
4188          * commands for this connection, and prepare the other commands
4189          * for realligence.
4190          *
4191          * During normal operation clear the out of order commands (but
4192          * do not free the struct iscsi_ooo_cmdsn's) and release all
4193          * struct iscsi_cmds.
4194          */
4195         if (atomic_read(&conn->connection_recovery)) {
4196                 iscsit_discard_unacknowledged_ooo_cmdsns_for_conn(conn);
4197                 iscsit_prepare_cmds_for_realligance(conn);
4198         } else {
4199                 iscsit_clear_ooo_cmdsns_for_conn(conn);
4200                 iscsit_release_commands_from_conn(conn);
4201         }
4202         iscsit_free_queue_reqs_for_conn(conn);
4203
4204         /*
4205          * Handle decrementing session or connection usage count if
4206          * a logout response was not able to be sent because the
4207          * connection failed.  Fall back to Session Recovery here.
4208          */
4209         if (atomic_read(&conn->conn_logout_remove)) {
4210                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_SESSION) {
4211                         iscsit_dec_conn_usage_count(conn);
4212                         iscsit_dec_session_usage_count(sess);
4213                 }
4214                 if (conn->conn_logout_reason == ISCSI_LOGOUT_REASON_CLOSE_CONNECTION)
4215                         iscsit_dec_conn_usage_count(conn);
4216
4217                 atomic_set(&conn->conn_logout_remove, 0);
4218                 atomic_set(&sess->session_reinstatement, 0);
4219                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4220         }
4221
4222         spin_lock_bh(&sess->conn_lock);
4223         list_del(&conn->conn_list);
4224
4225         /*
4226          * Attempt to let the Initiator know this connection failed by
4227          * sending an Connection Dropped Async Message on another
4228          * active connection.
4229          */
4230         if (atomic_read(&conn->connection_recovery))
4231                 iscsit_build_conn_drop_async_message(conn);
4232
4233         spin_unlock_bh(&sess->conn_lock);
4234
4235         /*
4236          * If connection reinstatement is being performed on this connection,
4237          * up the connection reinstatement semaphore that is being blocked on
4238          * in iscsit_cause_connection_reinstatement().
4239          */
4240         spin_lock_bh(&conn->state_lock);
4241         if (atomic_read(&conn->sleep_on_conn_wait_comp)) {
4242                 spin_unlock_bh(&conn->state_lock);
4243                 complete(&conn->conn_wait_comp);
4244                 wait_for_completion(&conn->conn_post_wait_comp);
4245                 spin_lock_bh(&conn->state_lock);
4246         }
4247
4248         /*
4249          * If connection reinstatement is being performed on this connection
4250          * by receiving a REMOVECONNFORRECOVERY logout request, up the
4251          * connection wait rcfr semaphore that is being blocked on
4252          * an iscsit_connection_reinstatement_rcfr().
4253          */
4254         if (atomic_read(&conn->connection_wait_rcfr)) {
4255                 spin_unlock_bh(&conn->state_lock);
4256                 complete(&conn->conn_wait_rcfr_comp);
4257                 wait_for_completion(&conn->conn_post_wait_comp);
4258                 spin_lock_bh(&conn->state_lock);
4259         }
4260         atomic_set(&conn->connection_reinstatement, 1);
4261         spin_unlock_bh(&conn->state_lock);
4262
4263         /*
4264          * If any other processes are accessing this connection pointer we
4265          * must wait until they have completed.
4266          */
4267         iscsit_check_conn_usage_count(conn);
4268
4269         ahash_request_free(conn->conn_tx_hash);
4270         if (conn->conn_rx_hash) {
4271                 struct crypto_ahash *tfm;
4272
4273                 tfm = crypto_ahash_reqtfm(conn->conn_rx_hash);
4274                 ahash_request_free(conn->conn_rx_hash);
4275                 crypto_free_ahash(tfm);
4276         }
4277
4278         free_cpumask_var(conn->conn_cpumask);
4279
4280         kfree(conn->conn_ops);
4281         conn->conn_ops = NULL;
4282
4283         if (conn->sock)
4284                 sock_release(conn->sock);
4285
4286         if (conn->conn_transport->iscsit_free_conn)
4287                 conn->conn_transport->iscsit_free_conn(conn);
4288
4289         iscsit_put_transport(conn->conn_transport);
4290
4291         pr_debug("Moving to TARG_CONN_STATE_FREE.\n");
4292         conn->conn_state = TARG_CONN_STATE_FREE;
4293         kfree(conn);
4294
4295         spin_lock_bh(&sess->conn_lock);
4296         atomic_dec(&sess->nconn);
4297         pr_debug("Decremented iSCSI connection count to %hu from node:"
4298                 " %s\n", atomic_read(&sess->nconn),
4299                 sess->sess_ops->InitiatorName);
4300         /*
4301          * Make sure that if one connection fails in an non ERL=2 iSCSI
4302          * Session that they all fail.
4303          */
4304         if ((sess->sess_ops->ErrorRecoveryLevel != 2) && !conn_logout &&
4305              !atomic_read(&sess->session_logout))
4306                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4307
4308         /*
4309          * If this was not the last connection in the session, and we are
4310          * performing session reinstatement or falling back to ERL=0, call
4311          * iscsit_stop_session() without sleeping to shutdown the other
4312          * active connections.
4313          */
4314         if (atomic_read(&sess->nconn)) {
4315                 if (!atomic_read(&sess->session_reinstatement) &&
4316                     !atomic_read(&sess->session_fall_back_to_erl0)) {
4317                         spin_unlock_bh(&sess->conn_lock);
4318                         return 0;
4319                 }
4320                 if (!atomic_read(&sess->session_stop_active)) {
4321                         atomic_set(&sess->session_stop_active, 1);
4322                         spin_unlock_bh(&sess->conn_lock);
4323                         iscsit_stop_session(sess, 0, 0);
4324                         return 0;
4325                 }
4326                 spin_unlock_bh(&sess->conn_lock);
4327                 return 0;
4328         }
4329
4330         /*
4331          * If this was the last connection in the session and one of the
4332          * following is occurring:
4333          *
4334          * Session Reinstatement is not being performed, and are falling back
4335          * to ERL=0 call iscsit_close_session().
4336          *
4337          * Session Logout was requested.  iscsit_close_session() will be called
4338          * elsewhere.
4339          *
4340          * Session Continuation is not being performed, start the Time2Retain
4341          * handler and check if sleep_on_sess_wait_sem is active.
4342          */
4343         if (!atomic_read(&sess->session_reinstatement) &&
4344              atomic_read(&sess->session_fall_back_to_erl0)) {
4345                 spin_unlock_bh(&sess->conn_lock);
4346                 complete_all(&sess->session_wait_comp);
4347                 iscsit_close_session(sess);
4348
4349                 return 0;
4350         } else if (atomic_read(&sess->session_logout)) {
4351                 pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4352                 sess->session_state = TARG_SESS_STATE_FREE;
4353
4354                 if (atomic_read(&sess->session_close)) {
4355                         spin_unlock_bh(&sess->conn_lock);
4356                         complete_all(&sess->session_wait_comp);
4357                         iscsit_close_session(sess);
4358                 } else {
4359                         spin_unlock_bh(&sess->conn_lock);
4360                 }
4361
4362                 return 0;
4363         } else {
4364                 pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4365                 sess->session_state = TARG_SESS_STATE_FAILED;
4366
4367                 if (!atomic_read(&sess->session_continuation))
4368                         iscsit_start_time2retain_handler(sess);
4369
4370                 if (atomic_read(&sess->session_close)) {
4371                         spin_unlock_bh(&sess->conn_lock);
4372                         complete_all(&sess->session_wait_comp);
4373                         iscsit_close_session(sess);
4374                 } else {
4375                         spin_unlock_bh(&sess->conn_lock);
4376                 }
4377
4378                 return 0;
4379         }
4380 }
4381
4382 /*
4383  * If the iSCSI Session for the iSCSI Initiator Node exists,
4384  * forcefully shutdown the iSCSI NEXUS.
4385  */
4386 int iscsit_close_session(struct iscsi_session *sess)
4387 {
4388         struct iscsi_portal_group *tpg = sess->tpg;
4389         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4390
4391         if (atomic_read(&sess->nconn)) {
4392                 pr_err("%d connection(s) still exist for iSCSI session"
4393                         " to %s\n", atomic_read(&sess->nconn),
4394                         sess->sess_ops->InitiatorName);
4395                 BUG();
4396         }
4397
4398         spin_lock_bh(&se_tpg->session_lock);
4399         atomic_set(&sess->session_logout, 1);
4400         atomic_set(&sess->session_reinstatement, 1);
4401         iscsit_stop_time2retain_timer(sess);
4402         spin_unlock_bh(&se_tpg->session_lock);
4403
4404         /*
4405          * transport_deregister_session_configfs() will clear the
4406          * struct se_node_acl->nacl_sess pointer now as a iscsi_np process context
4407          * can be setting it again with __transport_register_session() in
4408          * iscsi_post_login_handler() again after the iscsit_stop_session()
4409          * completes in iscsi_np context.
4410          */
4411         transport_deregister_session_configfs(sess->se_sess);
4412
4413         /*
4414          * If any other processes are accessing this session pointer we must
4415          * wait until they have completed.  If we are in an interrupt (the
4416          * time2retain handler) and contain and active session usage count we
4417          * restart the timer and exit.
4418          */
4419         if (!in_interrupt()) {
4420                 if (iscsit_check_session_usage_count(sess) == 1)
4421                         iscsit_stop_session(sess, 1, 1);
4422         } else {
4423                 if (iscsit_check_session_usage_count(sess) == 2) {
4424                         atomic_set(&sess->session_logout, 0);
4425                         iscsit_start_time2retain_handler(sess);
4426                         return 0;
4427                 }
4428         }
4429
4430         transport_deregister_session(sess->se_sess);
4431
4432         if (sess->sess_ops->ErrorRecoveryLevel == 2)
4433                 iscsit_free_connection_recovery_entires(sess);
4434
4435         iscsit_free_all_ooo_cmdsns(sess);
4436
4437         spin_lock_bh(&se_tpg->session_lock);
4438         pr_debug("Moving to TARG_SESS_STATE_FREE.\n");
4439         sess->session_state = TARG_SESS_STATE_FREE;
4440         pr_debug("Released iSCSI session from node: %s\n",
4441                         sess->sess_ops->InitiatorName);
4442         tpg->nsessions--;
4443         if (tpg->tpg_tiqn)
4444                 tpg->tpg_tiqn->tiqn_nsessions--;
4445
4446         pr_debug("Decremented number of active iSCSI Sessions on"
4447                 " iSCSI TPG: %hu to %u\n", tpg->tpgt, tpg->nsessions);
4448
4449         spin_lock(&sess_idr_lock);
4450         idr_remove(&sess_idr, sess->session_index);
4451         spin_unlock(&sess_idr_lock);
4452
4453         kfree(sess->sess_ops);
4454         sess->sess_ops = NULL;
4455         spin_unlock_bh(&se_tpg->session_lock);
4456
4457         kfree(sess);
4458         return 0;
4459 }
4460
4461 static void iscsit_logout_post_handler_closesession(
4462         struct iscsi_conn *conn)
4463 {
4464         struct iscsi_session *sess = conn->sess;
4465         int sleep = 1;
4466         /*
4467          * Traditional iscsi/tcp will invoke this logic from TX thread
4468          * context during session logout, so clear tx_thread_active and
4469          * sleep if iscsit_close_connection() has not already occured.
4470          *
4471          * Since iser-target invokes this logic from it's own workqueue,
4472          * always sleep waiting for RX/TX thread shutdown to complete
4473          * within iscsit_close_connection().
4474          */
4475         if (!conn->conn_transport->rdma_shutdown) {
4476                 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4477                 if (!sleep)
4478                         return;
4479         }
4480
4481         atomic_set(&conn->conn_logout_remove, 0);
4482         complete(&conn->conn_logout_comp);
4483
4484         iscsit_dec_conn_usage_count(conn);
4485         atomic_set(&sess->session_close, 1);
4486         iscsit_stop_session(sess, sleep, sleep);
4487         iscsit_dec_session_usage_count(sess);
4488 }
4489
4490 static void iscsit_logout_post_handler_samecid(
4491         struct iscsi_conn *conn)
4492 {
4493         int sleep = 1;
4494
4495         if (!conn->conn_transport->rdma_shutdown) {
4496                 sleep = cmpxchg(&conn->tx_thread_active, true, false);
4497                 if (!sleep)
4498                         return;
4499         }
4500
4501         atomic_set(&conn->conn_logout_remove, 0);
4502         complete(&conn->conn_logout_comp);
4503
4504         iscsit_cause_connection_reinstatement(conn, sleep);
4505         iscsit_dec_conn_usage_count(conn);
4506 }
4507
4508 static void iscsit_logout_post_handler_diffcid(
4509         struct iscsi_conn *conn,
4510         u16 cid)
4511 {
4512         struct iscsi_conn *l_conn;
4513         struct iscsi_session *sess = conn->sess;
4514         bool conn_found = false;
4515
4516         if (!sess)
4517                 return;
4518
4519         spin_lock_bh(&sess->conn_lock);
4520         list_for_each_entry(l_conn, &sess->sess_conn_list, conn_list) {
4521                 if (l_conn->cid == cid) {
4522                         iscsit_inc_conn_usage_count(l_conn);
4523                         conn_found = true;
4524                         break;
4525                 }
4526         }
4527         spin_unlock_bh(&sess->conn_lock);
4528
4529         if (!conn_found)
4530                 return;
4531
4532         if (l_conn->sock)
4533                 l_conn->sock->ops->shutdown(l_conn->sock, RCV_SHUTDOWN);
4534
4535         spin_lock_bh(&l_conn->state_lock);
4536         pr_debug("Moving to TARG_CONN_STATE_IN_LOGOUT.\n");
4537         l_conn->conn_state = TARG_CONN_STATE_IN_LOGOUT;
4538         spin_unlock_bh(&l_conn->state_lock);
4539
4540         iscsit_cause_connection_reinstatement(l_conn, 1);
4541         iscsit_dec_conn_usage_count(l_conn);
4542 }
4543
4544 /*
4545  *      Return of 0 causes the TX thread to restart.
4546  */
4547 int iscsit_logout_post_handler(
4548         struct iscsi_cmd *cmd,
4549         struct iscsi_conn *conn)
4550 {
4551         int ret = 0;
4552
4553         switch (cmd->logout_reason) {
4554         case ISCSI_LOGOUT_REASON_CLOSE_SESSION:
4555                 switch (cmd->logout_response) {
4556                 case ISCSI_LOGOUT_SUCCESS:
4557                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4558                 default:
4559                         iscsit_logout_post_handler_closesession(conn);
4560                         break;
4561                 }
4562                 ret = 0;
4563                 break;
4564         case ISCSI_LOGOUT_REASON_CLOSE_CONNECTION:
4565                 if (conn->cid == cmd->logout_cid) {
4566                         switch (cmd->logout_response) {
4567                         case ISCSI_LOGOUT_SUCCESS:
4568                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4569                         default:
4570                                 iscsit_logout_post_handler_samecid(conn);
4571                                 break;
4572                         }
4573                         ret = 0;
4574                 } else {
4575                         switch (cmd->logout_response) {
4576                         case ISCSI_LOGOUT_SUCCESS:
4577                                 iscsit_logout_post_handler_diffcid(conn,
4578                                         cmd->logout_cid);
4579                                 break;
4580                         case ISCSI_LOGOUT_CID_NOT_FOUND:
4581                         case ISCSI_LOGOUT_CLEANUP_FAILED:
4582                         default:
4583                                 break;
4584                         }
4585                         ret = 1;
4586                 }
4587                 break;
4588         case ISCSI_LOGOUT_REASON_RECOVERY:
4589                 switch (cmd->logout_response) {
4590                 case ISCSI_LOGOUT_SUCCESS:
4591                 case ISCSI_LOGOUT_CID_NOT_FOUND:
4592                 case ISCSI_LOGOUT_RECOVERY_UNSUPPORTED:
4593                 case ISCSI_LOGOUT_CLEANUP_FAILED:
4594                 default:
4595                         break;
4596                 }
4597                 ret = 1;
4598                 break;
4599         default:
4600                 break;
4601
4602         }
4603         return ret;
4604 }
4605 EXPORT_SYMBOL(iscsit_logout_post_handler);
4606
4607 void iscsit_fail_session(struct iscsi_session *sess)
4608 {
4609         struct iscsi_conn *conn;
4610
4611         spin_lock_bh(&sess->conn_lock);
4612         list_for_each_entry(conn, &sess->sess_conn_list, conn_list) {
4613                 pr_debug("Moving to TARG_CONN_STATE_CLEANUP_WAIT.\n");
4614                 conn->conn_state = TARG_CONN_STATE_CLEANUP_WAIT;
4615         }
4616         spin_unlock_bh(&sess->conn_lock);
4617
4618         pr_debug("Moving to TARG_SESS_STATE_FAILED.\n");
4619         sess->session_state = TARG_SESS_STATE_FAILED;
4620 }
4621
4622 void iscsit_stop_session(
4623         struct iscsi_session *sess,
4624         int session_sleep,
4625         int connection_sleep)
4626 {
4627         u16 conn_count = atomic_read(&sess->nconn);
4628         struct iscsi_conn *conn, *conn_tmp = NULL;
4629         int is_last;
4630
4631         spin_lock_bh(&sess->conn_lock);
4632
4633         if (connection_sleep) {
4634                 list_for_each_entry_safe(conn, conn_tmp, &sess->sess_conn_list,
4635                                 conn_list) {
4636                         if (conn_count == 0)
4637                                 break;
4638
4639                         if (list_is_last(&conn->conn_list, &sess->sess_conn_list)) {
4640                                 is_last = 1;
4641                         } else {
4642                                 iscsit_inc_conn_usage_count(conn_tmp);
4643                                 is_last = 0;
4644                         }
4645                         iscsit_inc_conn_usage_count(conn);
4646
4647                         spin_unlock_bh(&sess->conn_lock);
4648                         iscsit_cause_connection_reinstatement(conn, 1);
4649                         spin_lock_bh(&sess->conn_lock);
4650
4651                         iscsit_dec_conn_usage_count(conn);
4652                         if (is_last == 0)
4653                                 iscsit_dec_conn_usage_count(conn_tmp);
4654                         conn_count--;
4655                 }
4656         } else {
4657                 list_for_each_entry(conn, &sess->sess_conn_list, conn_list)
4658                         iscsit_cause_connection_reinstatement(conn, 0);
4659         }
4660
4661         if (session_sleep && atomic_read(&sess->nconn)) {
4662                 spin_unlock_bh(&sess->conn_lock);
4663                 wait_for_completion(&sess->session_wait_comp);
4664         } else
4665                 spin_unlock_bh(&sess->conn_lock);
4666 }
4667
4668 int iscsit_release_sessions_for_tpg(struct iscsi_portal_group *tpg, int force)
4669 {
4670         struct iscsi_session *sess;
4671         struct se_portal_group *se_tpg = &tpg->tpg_se_tpg;
4672         struct se_session *se_sess, *se_sess_tmp;
4673         LIST_HEAD(free_list);
4674         int session_count = 0;
4675
4676         spin_lock_bh(&se_tpg->session_lock);
4677         if (tpg->nsessions && !force) {
4678                 spin_unlock_bh(&se_tpg->session_lock);
4679                 return -1;
4680         }
4681
4682         list_for_each_entry_safe(se_sess, se_sess_tmp, &se_tpg->tpg_sess_list,
4683                         sess_list) {
4684                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4685
4686                 spin_lock(&sess->conn_lock);
4687                 if (atomic_read(&sess->session_fall_back_to_erl0) ||
4688                     atomic_read(&sess->session_logout) ||
4689                     atomic_read(&sess->session_close) ||
4690                     (sess->time2retain_timer_flags & ISCSI_TF_EXPIRED)) {
4691                         spin_unlock(&sess->conn_lock);
4692                         continue;
4693                 }
4694                 iscsit_inc_session_usage_count(sess);
4695                 atomic_set(&sess->session_reinstatement, 1);
4696                 atomic_set(&sess->session_fall_back_to_erl0, 1);
4697                 atomic_set(&sess->session_close, 1);
4698                 spin_unlock(&sess->conn_lock);
4699
4700                 list_move_tail(&se_sess->sess_list, &free_list);
4701         }
4702         spin_unlock_bh(&se_tpg->session_lock);
4703
4704         list_for_each_entry_safe(se_sess, se_sess_tmp, &free_list, sess_list) {
4705                 sess = (struct iscsi_session *)se_sess->fabric_sess_ptr;
4706
4707                 list_del_init(&se_sess->sess_list);
4708                 iscsit_stop_session(sess, 1, 1);
4709                 iscsit_dec_session_usage_count(sess);
4710                 session_count++;
4711         }
4712
4713         pr_debug("Released %d iSCSI Session(s) from Target Portal"
4714                         " Group: %hu\n", session_count, tpg->tpgt);
4715         return 0;
4716 }
4717
4718 MODULE_DESCRIPTION("iSCSI-Target Driver for mainline target infrastructure");
4719 MODULE_VERSION("4.1.x");
4720 MODULE_AUTHOR("nab@Linux-iSCSI.org");
4721 MODULE_LICENSE("GPL");
4722
4723 module_init(iscsi_target_init_module);
4724 module_exit(iscsi_target_cleanup_module);