smb2pdu.c

   1// SPDX-License-Identifier: LGPL-2.1
   2/*
   3 *
   4 *   Copyright (C) International Business Machines  Corp., 2009, 2013
   5 *                 Etersoft, 2012
   6 *   Author(s): Steve French (sfrench@us.ibm.com)
   7 *              Pavel Shilovsky (pshilovsky@samba.org) 2012
   8 *
   9 *   Contains the routines for constructing the SMB2 PDUs themselves
  10 *
  11 */
  12
  13 /* SMB2 PDU handling routines here - except for leftovers (eg session setup) */
  14 /* Note that there are handle based routines which must be		      */
  15 /* treated slightly differently for reconnection purposes since we never     */
  16 /* want to reuse a stale file handle and only the caller knows the file info */
  17
  18#include <linux/fs.h>
  19#include <linux/kernel.h>
  20#include <linux/vfs.h>
  21#include <linux/task_io_accounting_ops.h>
  22#include <linux/uaccess.h>
  23#include <linux/uuid.h>
  24#include <linux/pagemap.h>
  25#include <linux/xattr.h>
  26#include <linux/netfs.h>
  27#include <trace/events/netfs.h>
  28#include "cifsglob.h"
  29#include "cifsproto.h"
  30#include "cifsacl.h"
  31#include "smb2proto.h"
  32#include "cifs_unicode.h"
  33#include "cifs_debug.h"
  34#include "ntlmssp.h"
  35#include "../common/smb2status.h"
  36#include "smb2glob.h"
  37#include "cifspdu.h"
  38#include "cifs_spnego.h"
  39#include "../common/smbdirect/smbdirect.h"
  40#include "smbdirect.h"
  41#include "trace.h"
  42#ifdef CONFIG_CIFS_DFS_UPCALL
  43#include "dfs_cache.h"
  44#endif
  45#include "cached_dir.h"
  46#include "compress.h"
  47#include "fs_context.h"
  48
  49/*
  50 *  The following table defines the expected "StructureSize" of SMB2 requests
  51 *  in order by SMB2 command.  This is similar to "wct" in SMB/CIFS requests.
  52 *
  53 *  Note that commands are defined in smb2pdu.h in le16 but the array below is
  54 *  indexed by command in host byte order.
  55 */
  56static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
  57	/* SMB2_NEGOTIATE */ 36,
  58	/* SMB2_SESSION_SETUP */ 25,
  59	/* SMB2_LOGOFF */ 4,
  60	/* SMB2_TREE_CONNECT */	9,
  61	/* SMB2_TREE_DISCONNECT */ 4,
  62	/* SMB2_CREATE */ 57,
  63	/* SMB2_CLOSE */ 24,
  64	/* SMB2_FLUSH */ 24,
  65	/* SMB2_READ */	49,
  66	/* SMB2_WRITE */ 49,
  67	/* SMB2_LOCK */	48,
  68	/* SMB2_IOCTL */ 57,
  69	/* SMB2_CANCEL */ 4,
  70	/* SMB2_ECHO */ 4,
  71	/* SMB2_QUERY_DIRECTORY */ 33,
  72	/* SMB2_CHANGE_NOTIFY */ 32,
  73	/* SMB2_QUERY_INFO */ 41,
  74	/* SMB2_SET_INFO */ 33,
  75	/* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
  76};
  77
  78int smb3_encryption_required(const struct cifs_tcon *tcon)
  79{
  80	if (!tcon || !tcon->ses)
  81		return 0;
  82	if ((tcon->ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) ||
  83	    (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA))
  84		return 1;
  85	if (tcon->seal &&
  86	    (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
  87		return 1;
  88	if (((global_secflags & CIFSSEC_MUST_SEAL) == CIFSSEC_MUST_SEAL) &&
  89	    (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
  90		return 1;
  91	return 0;
  92}
  93
  94static void
  95smb2_hdr_assemble(struct smb2_hdr *shdr, __le16 smb2_cmd,
  96		  const struct cifs_tcon *tcon,
  97		  struct TCP_Server_Info *server)
  98{
  99	struct smb3_hdr_req *smb3_hdr;
 100
 101	shdr->ProtocolId = SMB2_PROTO_NUMBER;
 102	shdr->StructureSize = cpu_to_le16(64);
 103	shdr->Command = smb2_cmd;
 104
 105	if (server) {
 106		/* After reconnect SMB3 must set ChannelSequence on subsequent reqs */
 107		if (server->dialect >= SMB30_PROT_ID) {
 108			smb3_hdr = (struct smb3_hdr_req *)shdr;
 109			/*
 110			 * if primary channel is not set yet, use default
 111			 * channel for chan sequence num
 112			 */
 113			if (SERVER_IS_CHAN(server))
 114				smb3_hdr->ChannelSequence =
 115					cpu_to_le16(server->primary_server->channel_sequence_num);
 116			else
 117				smb3_hdr->ChannelSequence =
 118					cpu_to_le16(server->channel_sequence_num);
 119		}
 120		spin_lock(&server->req_lock);
 121		/* Request up to 10 credits but don't go over the limit. */
 122		if (server->credits >= server->max_credits)
 123			shdr->CreditRequest = cpu_to_le16(0);
 124		else
 125			shdr->CreditRequest = cpu_to_le16(
 126				min_t(int, server->max_credits -
 127						server->credits, 10));
 128		spin_unlock(&server->req_lock);
 129	} else {
 130		shdr->CreditRequest = cpu_to_le16(2);
 131	}
 132	shdr->Id.SyncId.ProcessId = cpu_to_le32((__u16)current->tgid);
 133
 134	if (!tcon)
 135		goto out;
 136
 137	/* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
 138	/* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
 139	if (server && (server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 140		shdr->CreditCharge = cpu_to_le16(1);
 141	/* else CreditCharge MBZ */
 142
 143	shdr->Id.SyncId.TreeId = cpu_to_le32(tcon->tid);
 144	/* Uid is not converted */
 145	if (tcon->ses)
 146		shdr->SessionId = cpu_to_le64(tcon->ses->Suid);
 147
 148	/*
 149	 * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
 150	 * to pass the path on the Open SMB prefixed by \\server\share.
 151	 * Not sure when we would need to do the augmented path (if ever) and
 152	 * setting this flag breaks the SMB2 open operation since it is
 153	 * illegal to send an empty path name (without \\server\share prefix)
 154	 * when the DFS flag is set in the SMB open header. We could
 155	 * consider setting the flag on all operations other than open
 156	 * but it is safer to net set it for now.
 157	 */
 158/*	if (tcon->share_flags & SHI1005_FLAGS_DFS)
 159		shdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
 160
 161	if (server && server->sign && !smb3_encryption_required(tcon))
 162		shdr->Flags |= SMB2_FLAGS_SIGNED;
 163out:
 164	return;
 165}
 166
 167/* helper function for code reuse */
 168static int
 169cifs_chan_skip_or_disable(struct cifs_ses *ses,
 170			  struct TCP_Server_Info *server,
 171			  bool from_reconnect, bool disable_mchan)
 172{
 173	struct TCP_Server_Info *pserver;
 174	unsigned int chan_index;
 175
 176	if (SERVER_IS_CHAN(server)) {
 177		cifs_dbg(VFS,
 178			"server %s does not support multichannel anymore. Skip secondary channel\n",
 179			 ses->server->hostname);
 180
 181		spin_lock(&ses->chan_lock);
 182		chan_index = cifs_ses_get_chan_index(ses, server);
 183		if (chan_index == CIFS_INVAL_CHAN_INDEX) {
 184			spin_unlock(&ses->chan_lock);
 185			goto skip_terminate;
 186		}
 187
 188		ses->chans[chan_index].server = NULL;
 189		server->terminate = true;
 190		spin_unlock(&ses->chan_lock);
 191
 192		/*
 193		 * the above reference of server by channel
 194		 * needs to be dropped without holding chan_lock
 195		 * as cifs_put_tcp_session takes a higher lock
 196		 * i.e. cifs_tcp_ses_lock
 197		 */
 198		cifs_put_tcp_session(server, from_reconnect);
 199
 200		cifs_signal_cifsd_for_reconnect(server, false);
 201
 202		/* mark primary server as needing reconnect */
 203		pserver = server->primary_server;
 204		cifs_signal_cifsd_for_reconnect(pserver, false);
 205skip_terminate:
 206		return -EHOSTDOWN;
 207	}
 208
 209	cifs_decrease_secondary_channels(ses, disable_mchan);
 210
 211	return 0;
 212}
 213
 214/*
 215 * smb3_update_ses_channels - Synchronize session channels with new configuration
 216 * @ses: pointer to the CIFS session structure
 217 * @server: pointer to the TCP server info structure
 218 * @from_reconnect: indicates if called from reconnect context
 219 * @disable_mchan: indicates if called from reconnect to disable multichannel
 220 *
 221 * Returns 0 on success or error code on failure.
 222 *
 223 * Outside of reconfigure, this function is called from cifs_mount() during mount
 224 * and from reconnect scenarios to adjust channel count when the
 225 * server's multichannel support changes.
 226 */
 227int smb3_update_ses_channels(struct cifs_ses *ses, struct TCP_Server_Info *server,
 228			bool from_reconnect, bool disable_mchan)
 229{
 230	int rc = 0;
 231	/*
 232	 * Manage session channels based on current count vs max:
 233	 * - If disable requested, skip or disable the channel
 234	 * - If below max channels, attempt to add more
 235	 * - If above max channels, skip or disable excess channels
 236	 */
 237	if (disable_mchan)
 238		rc = cifs_chan_skip_or_disable(ses, server, from_reconnect, disable_mchan);
 239	else {
 240		if (ses->chan_count < ses->chan_max)
 241			rc = cifs_try_adding_channels(ses);
 242		else if (ses->chan_count > ses->chan_max)
 243			rc = cifs_chan_skip_or_disable(ses, server, from_reconnect, disable_mchan);
 244	}
 245
 246	return rc;
 247}
 248
 249static int
 250smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon,
 251	       struct TCP_Server_Info *server, bool from_reconnect)
 252{
 253	struct cifs_ses *ses;
 254	int xid;
 255	int rc = 0;
 256
 257	/*
 258	 * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
 259	 * check for tcp and smb session status done differently
 260	 * for those three - in the calling routine.
 261	 */
 262	if (tcon == NULL)
 263		return 0;
 264
 265	if (smb2_command == SMB2_TREE_CONNECT)
 266		return 0;
 267
 268	spin_lock(&tcon->tc_lock);
 269	if (tcon->status == TID_EXITING) {
 270		/*
 271		 * only tree disconnect allowed when disconnecting ...
 272		 */
 273		if (smb2_command != SMB2_TREE_DISCONNECT) {
 274			spin_unlock(&tcon->tc_lock);
 275			cifs_tcon_dbg(FYI, "can not send cmd %d while umounting\n",
 276				      smb2_command);
 277			return -ENODEV;
 278		}
 279	}
 280	spin_unlock(&tcon->tc_lock);
 281
 282	ses = tcon->ses;
 283	if (!ses)
 284		return smb_EIO(smb_eio_trace_null_pointers);
 285	spin_lock(&ses->ses_lock);
 286	if (ses->ses_status == SES_EXITING) {
 287		spin_unlock(&ses->ses_lock);
 288		return smb_EIO(smb_eio_trace_sess_exiting);
 289	}
 290	spin_unlock(&ses->ses_lock);
 291	if (!ses->server || !server)
 292		return smb_EIO(smb_eio_trace_null_pointers);
 293
 294	spin_lock(&server->srv_lock);
 295	if (server->tcpStatus == CifsNeedReconnect) {
 296		/*
 297		 * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
 298		 * here since they are implicitly done when session drops.
 299		 */
 300		switch (smb2_command) {
 301		/*
 302		 * BB Should we keep oplock break and add flush to exceptions?
 303		 */
 304		case SMB2_TREE_DISCONNECT:
 305		case SMB2_CANCEL:
 306		case SMB2_CLOSE:
 307		case SMB2_OPLOCK_BREAK:
 308			spin_unlock(&server->srv_lock);
 309			return -EAGAIN;
 310		}
 311	}
 312
 313	/* if server is marked for termination, cifsd will cleanup */
 314	if (server->terminate) {
 315		spin_unlock(&server->srv_lock);
 316		return -EHOSTDOWN;
 317	}
 318	spin_unlock(&server->srv_lock);
 319
 320again:
 321	rc = cifs_wait_for_server_reconnect(server, tcon->retry);
 322	if (rc)
 323		return rc;
 324
 325	spin_lock(&ses->chan_lock);
 326	if (!cifs_chan_needs_reconnect(ses, server) && !tcon->need_reconnect) {
 327		spin_unlock(&ses->chan_lock);
 328		return 0;
 329	}
 330	spin_unlock(&ses->chan_lock);
 331	cifs_tcon_dbg(FYI, "sess reconnect mask: 0x%lx, tcon reconnect: %d\n",
 332		      tcon->ses->chans_need_reconnect,
 333		      tcon->need_reconnect);
 334
 335	mutex_lock(&ses->session_mutex);
 336	/*
 337	 * Handle the case where a concurrent thread failed to negotiate or
 338	 * killed a channel.
 339	 */
 340	spin_lock(&server->srv_lock);
 341	switch (server->tcpStatus) {
 342	case CifsExiting:
 343		spin_unlock(&server->srv_lock);
 344		mutex_unlock(&ses->session_mutex);
 345		return -EHOSTDOWN;
 346	case CifsNeedReconnect:
 347		spin_unlock(&server->srv_lock);
 348		mutex_unlock(&ses->session_mutex);
 349		if (!tcon->retry)
 350			return -EHOSTDOWN;
 351		goto again;
 352	default:
 353		break;
 354	}
 355	spin_unlock(&server->srv_lock);
 356
 357	/*
 358	 * need to prevent multiple threads trying to simultaneously
 359	 * reconnect the same SMB session
 360	 */
 361	spin_lock(&ses->ses_lock);
 362	spin_lock(&ses->chan_lock);
 363	if (!cifs_chan_needs_reconnect(ses, server) &&
 364	    ses->ses_status == SES_GOOD) {
 365		spin_unlock(&ses->chan_lock);
 366		spin_unlock(&ses->ses_lock);
 367		/* this means that we only need to tree connect */
 368		if (tcon->need_reconnect)
 369			goto skip_sess_setup;
 370
 371		mutex_unlock(&ses->session_mutex);
 372		goto out;
 373	}
 374	spin_unlock(&ses->chan_lock);
 375	spin_unlock(&ses->ses_lock);
 376
 377	rc = cifs_negotiate_protocol(0, ses, server);
 378	if (rc) {
 379		mutex_unlock(&ses->session_mutex);
 380		if (!tcon->retry)
 381			return -EHOSTDOWN;
 382		goto again;
 383	}
 384	/*
 385	 * if server stopped supporting multichannel
 386	 * and the first channel reconnected, disable all the others.
 387	 */
 388	if (ses->chan_count > 1 &&
 389	    !(server->capabilities & SMB2_GLOBAL_CAP_MULTI_CHANNEL)) {
 390		rc = smb3_update_ses_channels(ses, server,
 391					       from_reconnect, true /* disable_mchan */);
 392		if (rc) {
 393			mutex_unlock(&ses->session_mutex);
 394			goto out;
 395		}
 396	}
 397
 398	rc = cifs_setup_session(0, ses, server, ses->local_nls);
 399	if ((rc == -EACCES) || (rc == -EKEYEXPIRED) || (rc == -EKEYREVOKED)) {
 400		/*
 401		 * Try alternate password for next reconnect (key rotation
 402		 * could be enabled on the server e.g.) if an alternate
 403		 * password is available and the current password is expired,
 404		 * but do not swap on non pwd related errors like host down
 405		 */
 406		if (ses->password2)
 407			swap(ses->password2, ses->password);
 408	}
 409	if (rc) {
 410		mutex_unlock(&ses->session_mutex);
 411		if (rc == -EACCES && !tcon->retry)
 412			return -EHOSTDOWN;
 413		goto out;
 414	}
 415
 416skip_sess_setup:
 417	if (!tcon->need_reconnect) {
 418		mutex_unlock(&ses->session_mutex);
 419		goto out;
 420	}
 421	cifs_mark_open_files_invalid(tcon);
 422	if (tcon->use_persistent)
 423		tcon->need_reopen_files = true;
 424
 425	rc = cifs_tree_connect(0, tcon);
 426
 427	cifs_tcon_dbg(FYI, "reconnect tcon rc = %d\n", rc);
 428	if (rc) {
 429		/* If sess reconnected but tcon didn't, something strange ... */
 430		mutex_unlock(&ses->session_mutex);
 431		cifs_tcon_dbg(VFS, "reconnect tcon failed rc = %d\n", rc);
 432		goto out;
 433	}
 434
 435	spin_lock(&ses->ses_lock);
 436	if (ses->flags & CIFS_SES_FLAG_SCALE_CHANNELS) {
 437		spin_unlock(&ses->ses_lock);
 438		mutex_unlock(&ses->session_mutex);
 439		goto skip_add_channels;
 440	}
 441	ses->flags |= CIFS_SES_FLAG_SCALE_CHANNELS;
 442	spin_unlock(&ses->ses_lock);
 443
 444	if (!rc &&
 445	    (server->capabilities & SMB2_GLOBAL_CAP_MULTI_CHANNEL) &&
 446	    server->ops->query_server_interfaces) {
 447		/*
 448		 * query server network interfaces, in case they change.
 449		 * Also mark the session as pending this update while the query
 450		 * is in progress. This will be used to avoid calling
 451		 * smb2_reconnect recursively.
 452		 */
 453		ses->flags |= CIFS_SES_FLAGS_PENDING_QUERY_INTERFACES;
 454		xid = get_xid();
 455		rc = server->ops->query_server_interfaces(xid, tcon, false);
 456		free_xid(xid);
 457		ses->flags &= ~CIFS_SES_FLAGS_PENDING_QUERY_INTERFACES;
 458
 459		if (!tcon->ipc && !tcon->dummy)
 460			queue_delayed_work(cifsiod_wq, &tcon->query_interfaces,
 461					   (SMB_INTERFACE_POLL_INTERVAL * HZ));
 462
 463		mutex_unlock(&ses->session_mutex);
 464
 465		if (rc == -EOPNOTSUPP && ses->chan_count > 1) {
 466			/*
 467			 * some servers like Azure SMB server do not advertise
 468			 * that multichannel has been disabled with server
 469			 * capabilities, rather return STATUS_NOT_IMPLEMENTED.
 470			 * treat this as server not supporting multichannel
 471			 */
 472
 473			rc = smb3_update_ses_channels(ses, server,
 474						       from_reconnect,
 475						       true /* disable_mchan */);
 476			goto skip_add_channels;
 477		} else if (rc)
 478			cifs_tcon_dbg(FYI, "%s: failed to query server interfaces: %d\n",
 479				      __func__, rc);
 480
 481		if (ses->chan_max > ses->chan_count &&
 482		    ses->iface_count &&
 483		    !SERVER_IS_CHAN(server)) {
 484			if (ses->chan_count == 1)
 485				cifs_server_dbg(VFS, "supports multichannel now\n");
 486
 487			smb3_update_ses_channels(ses, server, from_reconnect,
 488						  false /* disable_mchan */);
 489		}
 490	} else {
 491		mutex_unlock(&ses->session_mutex);
 492	}
 493
 494skip_add_channels:
 495	spin_lock(&ses->ses_lock);
 496	ses->flags &= ~CIFS_SES_FLAG_SCALE_CHANNELS;
 497	spin_unlock(&ses->ses_lock);
 498
 499	if (smb2_command != SMB2_INTERNAL_CMD)
 500		cifs_queue_server_reconn(server);
 501
 502	atomic_inc(&tconInfoReconnectCount);
 503out:
 504	/*
 505	 * Check if handle based operation so we know whether we can continue
 506	 * or not without returning to caller to reset file handle.
 507	 */
 508	/*
 509	 * BB Is flush done by server on drop of tcp session? Should we special
 510	 * case it and skip above?
 511	 */
 512	switch (smb2_command) {
 513	case SMB2_FLUSH:
 514	case SMB2_READ:
 515	case SMB2_WRITE:
 516	case SMB2_LOCK:
 517	case SMB2_QUERY_DIRECTORY:
 518	case SMB2_CHANGE_NOTIFY:
 519	case SMB2_QUERY_INFO:
 520	case SMB2_SET_INFO:
 521	case SMB2_IOCTL:
 522		rc = -EAGAIN;
 523	}
 524	return rc;
 525}
 526
 527static void
 528fill_small_buf(__le16 smb2_command, struct cifs_tcon *tcon,
 529	       struct TCP_Server_Info *server,
 530	       void *buf,
 531	       unsigned int *total_len)
 532{
 533	struct smb2_pdu *spdu = buf;
 534	/* lookup word count ie StructureSize from table */
 535	__u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_command)];
 536
 537	/*
 538	 * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
 539	 * largest operations (Create)
 540	 */
 541	memset(buf, 0, 256);
 542
 543	smb2_hdr_assemble(&spdu->hdr, smb2_command, tcon, server);
 544	spdu->StructureSize2 = cpu_to_le16(parmsize);
 545
 546	*total_len = parmsize + sizeof(struct smb2_hdr);
 547}
 548
 549/*
 550 * Allocate and return pointer to an SMB request hdr, and set basic
 551 * SMB information in the SMB header. If the return code is zero, this
 552 * function must have filled in request_buf pointer.
 553 */
 554static int __smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
 555				 struct TCP_Server_Info *server,
 556				 void **request_buf, unsigned int *total_len)
 557{
 558	/* BB eventually switch this to SMB2 specific small buf size */
 559	switch (smb2_command) {
 560	case SMB2_SET_INFO:
 561	case SMB2_QUERY_INFO:
 562		*request_buf = cifs_buf_get();
 563		break;
 564	default:
 565		*request_buf = cifs_small_buf_get();
 566		break;
 567	}
 568	if (*request_buf == NULL) {
 569		/* BB should we add a retry in here if not a writepage? */
 570		return -ENOMEM;
 571	}
 572
 573	fill_small_buf(smb2_command, tcon, server,
 574		       (struct smb2_hdr *)(*request_buf),
 575		       total_len);
 576
 577	if (tcon != NULL) {
 578		uint16_t com_code = le16_to_cpu(smb2_command);
 579		cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
 580		cifs_stats_inc(&tcon->num_smbs_sent);
 581	}
 582
 583	return 0;
 584}
 585
 586static int smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
 587			       struct TCP_Server_Info *server,
 588			       void **request_buf, unsigned int *total_len)
 589{
 590	int rc;
 591
 592	rc = smb2_reconnect(smb2_command, tcon, server, false);
 593	if (rc)
 594		return rc;
 595
 596	return __smb2_plain_req_init(smb2_command, tcon, server, request_buf,
 597				     total_len);
 598}
 599
 600static int smb2_ioctl_req_init(u32 opcode, struct cifs_tcon *tcon,
 601			       struct TCP_Server_Info *server,
 602			       void **request_buf, unsigned int *total_len)
 603{
 604	/*
 605	 * Skip reconnect in one of the following cases:
 606	 * 1. For FSCTL_VALIDATE_NEGOTIATE_INFO IOCTLs
 607	 * 2. For FSCTL_QUERY_NETWORK_INTERFACE_INFO IOCTL when called from
 608	 * smb2_reconnect (indicated by CIFS_SES_FLAG_SCALE_CHANNELS ses flag)
 609	 */
 610	if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO ||
 611	    (opcode == FSCTL_QUERY_NETWORK_INTERFACE_INFO &&
 612	     (tcon->ses->flags & CIFS_SES_FLAGS_PENDING_QUERY_INTERFACES)))
 613		return __smb2_plain_req_init(SMB2_IOCTL, tcon, server,
 614					     request_buf, total_len);
 615
 616	return smb2_plain_req_init(SMB2_IOCTL, tcon, server,
 617				   request_buf, total_len);
 618}
 619
 620/* For explanation of negotiate contexts see MS-SMB2 section 2.2.3.1 */
 621
 622static void
 623build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
 624{
 625	pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
 626	pneg_ctxt->DataLength = cpu_to_le16(38);
 627	pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
 628	pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE);
 629	get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE);
 630	pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
 631}
 632
 633static void
 634build_compression_ctxt(struct smb2_compression_capabilities_context *pneg_ctxt)
 635{
 636	pneg_ctxt->ContextType = SMB2_COMPRESSION_CAPABILITIES;
 637	pneg_ctxt->DataLength =
 638		cpu_to_le16(sizeof(struct smb2_compression_capabilities_context)
 639			  - sizeof(struct smb2_neg_context));
 640	pneg_ctxt->CompressionAlgorithmCount = cpu_to_le16(3);
 641	pneg_ctxt->CompressionAlgorithms[0] = SMB3_COMPRESS_LZ77;
 642	pneg_ctxt->CompressionAlgorithms[1] = SMB3_COMPRESS_LZ77_HUFF;
 643	pneg_ctxt->CompressionAlgorithms[2] = SMB3_COMPRESS_LZNT1;
 644}
 645
 646static unsigned int
 647build_signing_ctxt(struct smb2_signing_capabilities *pneg_ctxt)
 648{
 649	unsigned int ctxt_len = sizeof(struct smb2_signing_capabilities);
 650	unsigned short num_algs = 1; /* number of signing algorithms sent */
 651
 652	pneg_ctxt->ContextType = SMB2_SIGNING_CAPABILITIES;
 653	/*
 654	 * Context Data length must be rounded to multiple of 8 for some servers
 655	 */
 656	pneg_ctxt->DataLength = cpu_to_le16(ALIGN(sizeof(struct smb2_signing_capabilities) -
 657					    sizeof(struct smb2_neg_context) +
 658					    (num_algs * sizeof(u16)), 8));
 659	pneg_ctxt->SigningAlgorithmCount = cpu_to_le16(num_algs);
 660	pneg_ctxt->SigningAlgorithms[0] = cpu_to_le16(SIGNING_ALG_AES_CMAC);
 661
 662	ctxt_len += sizeof(__le16) * num_algs;
 663	ctxt_len = ALIGN(ctxt_len, 8);
 664	return ctxt_len;
 665	/* TBD add SIGNING_ALG_AES_GMAC and/or SIGNING_ALG_HMAC_SHA256 */
 666}
 667
 668static void
 669build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
 670{
 671	pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
 672	if (require_gcm_256) {
 673		pneg_ctxt->DataLength = cpu_to_le16(4); /* Cipher Count + 1 cipher */
 674		pneg_ctxt->CipherCount = cpu_to_le16(1);
 675		pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES256_GCM;
 676	} else if (enable_gcm_256) {
 677		pneg_ctxt->DataLength = cpu_to_le16(8); /* Cipher Count + 3 ciphers */
 678		pneg_ctxt->CipherCount = cpu_to_le16(3);
 679		pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
 680		pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES256_GCM;
 681		pneg_ctxt->Ciphers[2] = SMB2_ENCRYPTION_AES128_CCM;
 682	} else {
 683		pneg_ctxt->DataLength = cpu_to_le16(6); /* Cipher Count + 2 ciphers */
 684		pneg_ctxt->CipherCount = cpu_to_le16(2);
 685		pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
 686		pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES128_CCM;
 687	}
 688}
 689
 690static unsigned int
 691build_netname_ctxt(struct smb2_netname_neg_context *pneg_ctxt, char *hostname)
 692{
 693	struct nls_table *cp = load_nls_default();
 694
 695	pneg_ctxt->ContextType = SMB2_NETNAME_NEGOTIATE_CONTEXT_ID;
 696
 697	/* copy up to max of first 100 bytes of server name to NetName field */
 698	pneg_ctxt->DataLength = cpu_to_le16(2 * cifs_strtoUTF16(pneg_ctxt->NetName, hostname, 100, cp));
 699	/* context size is DataLength + minimal smb2_neg_context */
 700	return ALIGN(le16_to_cpu(pneg_ctxt->DataLength) + sizeof(struct smb2_neg_context), 8);
 701}
 702
 703static void
 704build_posix_ctxt(struct smb2_posix_neg_context *pneg_ctxt)
 705{
 706	pneg_ctxt->ContextType = SMB2_POSIX_EXTENSIONS_AVAILABLE;
 707	pneg_ctxt->DataLength = cpu_to_le16(POSIX_CTXT_DATA_LEN);
 708	/* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
 709	pneg_ctxt->Name[0] = 0x93;
 710	pneg_ctxt->Name[1] = 0xAD;
 711	pneg_ctxt->Name[2] = 0x25;
 712	pneg_ctxt->Name[3] = 0x50;
 713	pneg_ctxt->Name[4] = 0x9C;
 714	pneg_ctxt->Name[5] = 0xB4;
 715	pneg_ctxt->Name[6] = 0x11;
 716	pneg_ctxt->Name[7] = 0xE7;
 717	pneg_ctxt->Name[8] = 0xB4;
 718	pneg_ctxt->Name[9] = 0x23;
 719	pneg_ctxt->Name[10] = 0x83;
 720	pneg_ctxt->Name[11] = 0xDE;
 721	pneg_ctxt->Name[12] = 0x96;
 722	pneg_ctxt->Name[13] = 0x8B;
 723	pneg_ctxt->Name[14] = 0xCD;
 724	pneg_ctxt->Name[15] = 0x7C;
 725}
 726
 727static void
 728assemble_neg_contexts(struct smb2_negotiate_req *req,
 729		      struct TCP_Server_Info *server, unsigned int *total_len)
 730{
 731	unsigned int ctxt_len, neg_context_count;
 732	struct TCP_Server_Info *pserver;
 733	char *pneg_ctxt;
 734	char *hostname;
 735
 736	if (*total_len > 200) {
 737		/* In case length corrupted don't want to overrun smb buffer */
 738		cifs_server_dbg(VFS, "Bad frame length assembling neg contexts\n");
 739		return;
 740	}
 741
 742	/*
 743	 * round up total_len of fixed part of SMB3 negotiate request to 8
 744	 * byte boundary before adding negotiate contexts
 745	 */
 746	*total_len = ALIGN(*total_len, 8);
 747
 748	pneg_ctxt = (*total_len) + (char *)req;
 749	req->NegotiateContextOffset = cpu_to_le32(*total_len);
 750
 751	build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
 752	ctxt_len = ALIGN(sizeof(struct smb2_preauth_neg_context), 8);
 753	*total_len += ctxt_len;
 754	pneg_ctxt += ctxt_len;
 755
 756	build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
 757	ctxt_len = ALIGN(sizeof(struct smb2_encryption_neg_context), 8);
 758	*total_len += ctxt_len;
 759	pneg_ctxt += ctxt_len;
 760
 761	/*
 762	 * secondary channels don't have the hostname field populated
 763	 * use the hostname field in the primary channel instead
 764	 */
 765	pserver = SERVER_IS_CHAN(server) ? server->primary_server : server;
 766	cifs_server_lock(pserver);
 767	hostname = pserver->hostname;
 768	if (hostname && (hostname[0] != 0)) {
 769		ctxt_len = build_netname_ctxt((struct smb2_netname_neg_context *)pneg_ctxt,
 770					      hostname);
 771		*total_len += ctxt_len;
 772		pneg_ctxt += ctxt_len;
 773		neg_context_count = 3;
 774	} else
 775		neg_context_count = 2;
 776	cifs_server_unlock(pserver);
 777
 778	build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt);
 779	*total_len += sizeof(struct smb2_posix_neg_context);
 780	pneg_ctxt += sizeof(struct smb2_posix_neg_context);
 781	neg_context_count++;
 782
 783	if (server->compression.requested) {
 784		build_compression_ctxt((struct smb2_compression_capabilities_context *)
 785				pneg_ctxt);
 786		ctxt_len = ALIGN(sizeof(struct smb2_compression_capabilities_context), 8);
 787		*total_len += ctxt_len;
 788		pneg_ctxt += ctxt_len;
 789		neg_context_count++;
 790	}
 791
 792	if (enable_negotiate_signing) {
 793		ctxt_len = build_signing_ctxt((struct smb2_signing_capabilities *)
 794				pneg_ctxt);
 795		*total_len += ctxt_len;
 796		pneg_ctxt += ctxt_len;
 797		neg_context_count++;
 798	}
 799
 800	/* check for and add transport_capabilities and signing capabilities */
 801	req->NegotiateContextCount = cpu_to_le16(neg_context_count);
 802
 803}
 804
 805/* If invalid preauth context warn but use what we requested, SHA-512 */
 806static void decode_preauth_context(struct smb2_preauth_neg_context *ctxt)
 807{
 808	unsigned int len = le16_to_cpu(ctxt->DataLength);
 809
 810	/*
 811	 * Caller checked that DataLength remains within SMB boundary. We still
 812	 * need to confirm that one HashAlgorithms member is accounted for.
 813	 */
 814	if (len < MIN_PREAUTH_CTXT_DATA_LEN) {
 815		pr_warn_once("server sent bad preauth context\n");
 816		return;
 817	} else if (len < MIN_PREAUTH_CTXT_DATA_LEN + le16_to_cpu(ctxt->SaltLength)) {
 818		pr_warn_once("server sent invalid SaltLength\n");
 819		return;
 820	}
 821	if (le16_to_cpu(ctxt->HashAlgorithmCount) != 1)
 822		pr_warn_once("Invalid SMB3 hash algorithm count\n");
 823	if (ctxt->HashAlgorithms != SMB2_PREAUTH_INTEGRITY_SHA512)
 824		pr_warn_once("unknown SMB3 hash algorithm\n");
 825}
 826
 827static void decode_compress_ctx(struct TCP_Server_Info *server,
 828			 struct smb2_compression_capabilities_context *ctxt)
 829{
 830	unsigned int len = le16_to_cpu(ctxt->DataLength);
 831	__le16 alg;
 832
 833	server->compression.enabled = false;
 834
 835	/*
 836	 * Caller checked that DataLength remains within SMB boundary. We still
 837	 * need to confirm that one CompressionAlgorithms member is accounted
 838	 * for.
 839	 */
 840	if (len < 10) {
 841		pr_warn_once("server sent bad compression cntxt\n");
 842		return;
 843	}
 844
 845	if (le16_to_cpu(ctxt->CompressionAlgorithmCount) != 1) {
 846		pr_warn_once("invalid SMB3 compress algorithm count\n");
 847		return;
 848	}
 849
 850	alg = ctxt->CompressionAlgorithms[0];
 851
 852	/* 'NONE' (0) compressor type is never negotiated */
 853	if (alg == 0 || le16_to_cpu(alg) > 3) {
 854		pr_warn_once("invalid compression algorithm '%u'\n", alg);
 855		return;
 856	}
 857
 858	server->compression.alg = alg;
 859	server->compression.enabled = true;
 860}
 861
 862static int decode_encrypt_ctx(struct TCP_Server_Info *server,
 863			      struct smb2_encryption_neg_context *ctxt)
 864{
 865	unsigned int len = le16_to_cpu(ctxt->DataLength);
 866
 867	cifs_dbg(FYI, "decode SMB3.11 encryption neg context of len %d\n", len);
 868	/*
 869	 * Caller checked that DataLength remains within SMB boundary. We still
 870	 * need to confirm that one Cipher flexible array member is accounted
 871	 * for.
 872	 */
 873	if (len < MIN_ENCRYPT_CTXT_DATA_LEN) {
 874		pr_warn_once("server sent bad crypto ctxt len\n");
 875		return -EINVAL;
 876	}
 877
 878	if (le16_to_cpu(ctxt->CipherCount) != 1) {
 879		pr_warn_once("Invalid SMB3.11 cipher count\n");
 880		return -EINVAL;
 881	}
 882	cifs_dbg(FYI, "SMB311 cipher type:%d\n", le16_to_cpu(ctxt->Ciphers[0]));
 883	if (require_gcm_256) {
 884		if (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES256_GCM) {
 885			cifs_dbg(VFS, "Server does not support requested encryption type (AES256 GCM)\n");
 886			return -EOPNOTSUPP;
 887		}
 888	} else if (ctxt->Ciphers[0] == 0) {
 889		/*
 890		 * e.g. if server only supported AES256_CCM (very unlikely)
 891		 * or server supported no encryption types or had all disabled.
 892		 * Since GLOBAL_CAP_ENCRYPTION will be not set, in the case
 893		 * in which mount requested encryption ("seal") checks later
 894		 * on during tree connection will return proper rc, but if
 895		 * seal not requested by client, since server is allowed to
 896		 * return 0 to indicate no supported cipher, we can't fail here
 897		 */
 898		server->cipher_type = 0;
 899		server->capabilities &= ~SMB2_GLOBAL_CAP_ENCRYPTION;
 900		pr_warn_once("Server does not support requested encryption types\n");
 901		return 0;
 902	} else if ((ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_CCM) &&
 903		   (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_GCM) &&
 904		   (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES256_GCM)) {
 905		/* server returned a cipher we didn't ask for */
 906		pr_warn_once("Invalid SMB3.11 cipher returned\n");
 907		return -EINVAL;
 908	}
 909	server->cipher_type = ctxt->Ciphers[0];
 910	server->capabilities |= SMB2_GLOBAL_CAP_ENCRYPTION;
 911	return 0;
 912}
 913
 914static void decode_signing_ctx(struct TCP_Server_Info *server,
 915			       struct smb2_signing_capabilities *pctxt)
 916{
 917	unsigned int len = le16_to_cpu(pctxt->DataLength);
 918
 919	/*
 920	 * Caller checked that DataLength remains within SMB boundary. We still
 921	 * need to confirm that one SigningAlgorithms flexible array member is
 922	 * accounted for.
 923	 */
 924	if ((len < 4) || (len > 16)) {
 925		pr_warn_once("server sent bad signing negcontext\n");
 926		return;
 927	}
 928	if (le16_to_cpu(pctxt->SigningAlgorithmCount) != 1) {
 929		pr_warn_once("Invalid signing algorithm count\n");
 930		return;
 931	}
 932	if (le16_to_cpu(pctxt->SigningAlgorithms[0]) > 2) {
 933		pr_warn_once("unknown signing algorithm\n");
 934		return;
 935	}
 936
 937	server->signing_negotiated = true;
 938	server->signing_algorithm = le16_to_cpu(pctxt->SigningAlgorithms[0]);
 939	cifs_dbg(FYI, "signing algorithm %d chosen\n",
 940		     server->signing_algorithm);
 941}
 942
 943
 944static int smb311_decode_neg_context(struct smb2_negotiate_rsp *rsp,
 945				     struct TCP_Server_Info *server,
 946				     unsigned int len_of_smb)
 947{
 948	struct smb2_neg_context *pctx;
 949	unsigned int offset = le32_to_cpu(rsp->NegotiateContextOffset);
 950	unsigned int ctxt_cnt = le16_to_cpu(rsp->NegotiateContextCount);
 951	unsigned int len_of_ctxts, i;
 952	int rc = 0;
 953
 954	cifs_dbg(FYI, "decoding %d negotiate contexts\n", ctxt_cnt);
 955	if (len_of_smb <= offset) {
 956		cifs_server_dbg(VFS, "Invalid response: negotiate context offset\n");
 957		return -EINVAL;
 958	}
 959
 960	len_of_ctxts = len_of_smb - offset;
 961
 962	for (i = 0; i < ctxt_cnt; i++) {
 963		int clen;
 964		/* check that offset is not beyond end of SMB */
 965		if (len_of_ctxts < sizeof(struct smb2_neg_context))
 966			break;
 967
 968		pctx = (struct smb2_neg_context *)(offset + (char *)rsp);
 969		clen = sizeof(struct smb2_neg_context)
 970			+ le16_to_cpu(pctx->DataLength);
 971		/*
 972		 * 2.2.4 SMB2 NEGOTIATE Response
 973		 * Subsequent negotiate contexts MUST appear at the first 8-byte
 974		 * aligned offset following the previous negotiate context.
 975		 */
 976		if (i + 1 != ctxt_cnt)
 977			clen = ALIGN(clen, 8);
 978		if (clen > len_of_ctxts)
 979			break;
 980
 981		if (pctx->ContextType == SMB2_PREAUTH_INTEGRITY_CAPABILITIES)
 982			decode_preauth_context(
 983				(struct smb2_preauth_neg_context *)pctx);
 984		else if (pctx->ContextType == SMB2_ENCRYPTION_CAPABILITIES)
 985			rc = decode_encrypt_ctx(server,
 986				(struct smb2_encryption_neg_context *)pctx);
 987		else if (pctx->ContextType == SMB2_COMPRESSION_CAPABILITIES)
 988			decode_compress_ctx(server,
 989				(struct smb2_compression_capabilities_context *)pctx);
 990		else if (pctx->ContextType == SMB2_POSIX_EXTENSIONS_AVAILABLE)
 991			server->posix_ext_supported = true;
 992		else if (pctx->ContextType == SMB2_SIGNING_CAPABILITIES)
 993			decode_signing_ctx(server,
 994				(struct smb2_signing_capabilities *)pctx);
 995		else
 996			cifs_server_dbg(VFS, "unknown negcontext of type %d ignored\n",
 997				le16_to_cpu(pctx->ContextType));
 998		if (rc)
 999			break;
1000
1001		offset += clen;
1002		len_of_ctxts -= clen;
1003	}
1004	return rc;
1005}
1006
1007static struct create_posix *
1008create_posix_buf(umode_t mode)
1009{
1010	struct create_posix *buf;
1011
1012	buf = kzalloc(sizeof(struct create_posix),
1013			GFP_KERNEL);
1014	if (!buf)
1015		return NULL;
1016
1017	buf->ccontext.DataOffset =
1018		cpu_to_le16(offsetof(struct create_posix, Mode));
1019	buf->ccontext.DataLength = cpu_to_le32(4);
1020	buf->ccontext.NameOffset =
1021		cpu_to_le16(offsetof(struct create_posix, Name));
1022	buf->ccontext.NameLength = cpu_to_le16(16);
1023
1024	/* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
1025	buf->Name[0] = 0x93;
1026	buf->Name[1] = 0xAD;
1027	buf->Name[2] = 0x25;
1028	buf->Name[3] = 0x50;
1029	buf->Name[4] = 0x9C;
1030	buf->Name[5] = 0xB4;
1031	buf->Name[6] = 0x11;
1032	buf->Name[7] = 0xE7;
1033	buf->Name[8] = 0xB4;
1034	buf->Name[9] = 0x23;
1035	buf->Name[10] = 0x83;
1036	buf->Name[11] = 0xDE;
1037	buf->Name[12] = 0x96;
1038	buf->Name[13] = 0x8B;
1039	buf->Name[14] = 0xCD;
1040	buf->Name[15] = 0x7C;
1041	buf->Mode = cpu_to_le32(mode);
1042	cifs_dbg(FYI, "mode on posix create 0%o\n", mode);
1043	return buf;
1044}
1045
1046static int
1047add_posix_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode)
1048{
1049	unsigned int num = *num_iovec;
1050
1051	iov[num].iov_base = create_posix_buf(mode);
1052	if (mode == ACL_NO_MODE)
1053		cifs_dbg(FYI, "%s: no mode\n", __func__);
1054	if (iov[num].iov_base == NULL)
1055		return -ENOMEM;
1056	iov[num].iov_len = sizeof(struct create_posix);
1057	*num_iovec = num + 1;
1058	return 0;
1059}
1060
1061
1062/*
1063 *
1064 *	SMB2 Worker functions follow:
1065 *
1066 *	The general structure of the worker functions is:
1067 *	1) Call smb2_init (assembles SMB2 header)
1068 *	2) Initialize SMB2 command specific fields in fixed length area of SMB
1069 *	3) Call smb_sendrcv2 (sends request on socket and waits for response)
1070 *	4) Decode SMB2 command specific fields in the fixed length area
1071 *	5) Decode variable length data area (if any for this SMB2 command type)
1072 *	6) Call free smb buffer
1073 *	7) return
1074 *
1075 */
1076
1077int
1078SMB2_negotiate(const unsigned int xid,
1079	       struct cifs_ses *ses,
1080	       struct TCP_Server_Info *server)
1081{
1082	struct smb_rqst rqst;
1083	struct smb2_negotiate_req *req;
1084	struct smb2_negotiate_rsp *rsp;
1085	struct kvec iov[1];
1086	struct kvec rsp_iov;
1087	int rc;
1088	int resp_buftype;
1089	int blob_offset, blob_length;
1090	char *security_blob;
1091	int flags = CIFS_NEG_OP;
1092	unsigned int total_len;
1093
1094	cifs_dbg(FYI, "Negotiate protocol\n");
1095
1096	if (!server) {
1097		WARN(1, "%s: server is NULL!\n", __func__);
1098		return smb_EIO(smb_eio_trace_null_pointers);
1099	}
1100
1101	rc = smb2_plain_req_init(SMB2_NEGOTIATE, NULL, server,
1102				 (void **) &req, &total_len);
1103	if (rc)
1104		return rc;
1105
1106	req->hdr.SessionId = 0;
1107
1108	memset(server->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
1109	memset(ses->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
1110
1111	if (strcmp(server->vals->version_string,
1112		   SMB3ANY_VERSION_STRING) == 0) {
1113		req->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
1114		req->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
1115		req->Dialects[2] = cpu_to_le16(SMB311_PROT_ID);
1116		req->DialectCount = cpu_to_le16(3);
1117		total_len += 6;
1118	} else if (strcmp(server->vals->version_string,
1119		   SMBDEFAULT_VERSION_STRING) == 0) {
1120		req->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
1121		req->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
1122		req->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
1123		req->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
1124		req->DialectCount = cpu_to_le16(4);
1125		total_len += 8;
1126	} else {
1127		/* otherwise send specific dialect */
1128		req->Dialects[0] = cpu_to_le16(server->vals->protocol_id);
1129		req->DialectCount = cpu_to_le16(1);
1130		total_len += 2;
1131	}
1132
1133	/* only one of SMB2 signing flags may be set in SMB2 request */
1134	if (ses->sign)
1135		req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
1136	else if (global_secflags & CIFSSEC_MAY_SIGN)
1137		req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
1138	else
1139		req->SecurityMode = 0;
1140
1141	req->Capabilities = cpu_to_le32(server->vals->req_capabilities);
1142	req->Capabilities |= cpu_to_le32(SMB2_GLOBAL_CAP_MULTI_CHANNEL);
1143
1144	/* ClientGUID must be zero for SMB2.02 dialect */
1145	if (server->vals->protocol_id == SMB20_PROT_ID)
1146		memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
1147	else {
1148		memcpy(req->ClientGUID, server->client_guid,
1149			SMB2_CLIENT_GUID_SIZE);
1150		if ((server->vals->protocol_id == SMB311_PROT_ID) ||
1151		    (strcmp(server->vals->version_string,
1152		     SMB3ANY_VERSION_STRING) == 0) ||
1153		    (strcmp(server->vals->version_string,
1154		     SMBDEFAULT_VERSION_STRING) == 0))
1155			assemble_neg_contexts(req, server, &total_len);
1156	}
1157	iov[0].iov_base = (char *)req;
1158	iov[0].iov_len = total_len;
1159
1160	memset(&rqst, 0, sizeof(struct smb_rqst));
1161	rqst.rq_iov = iov;
1162	rqst.rq_nvec = 1;
1163
1164	rc = cifs_send_recv(xid, ses, server,
1165			    &rqst, &resp_buftype, flags, &rsp_iov);
1166	cifs_small_buf_release(req);
1167	rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base;
1168	/*
1169	 * No tcon so can't do
1170	 * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1171	 */
1172	if (rc == -EOPNOTSUPP) {
1173		cifs_server_dbg(VFS, "Dialect not supported by server. Consider  specifying vers=1.0 or vers=2.0 on mount for accessing older servers\n");
1174		goto neg_exit;
1175	} else if (rc != 0)
1176		goto neg_exit;
1177
1178	u16 dialect = le16_to_cpu(rsp->DialectRevision);
1179	if (strcmp(server->vals->version_string,
1180		   SMB3ANY_VERSION_STRING) == 0) {
1181		switch (dialect) {
1182		case SMB20_PROT_ID:
1183			cifs_server_dbg(VFS,
1184				"SMB2 dialect returned but not requested\n");
1185			rc = smb_EIO2(smb_eio_trace_neg_unreq_dialect, dialect, 3);
1186			goto neg_exit;
1187		case SMB21_PROT_ID:
1188			cifs_server_dbg(VFS,
1189				"SMB2.1 dialect returned but not requested\n");
1190			rc = smb_EIO2(smb_eio_trace_neg_unreq_dialect, dialect, 3);
1191			goto neg_exit;
1192		case SMB311_PROT_ID:
1193			/* ops set to 3.0 by default for default so update */
1194			server->ops = &smb311_operations;
1195			server->vals = &smb311_values;
1196			break;
1197		default:
1198			break;
1199		}
1200	} else if (strcmp(server->vals->version_string,
1201			  SMBDEFAULT_VERSION_STRING) == 0) {
1202		switch (dialect) {
1203		case SMB20_PROT_ID:
1204			cifs_server_dbg(VFS,
1205				"SMB2 dialect returned but not requested\n");
1206			rc = smb_EIO2(smb_eio_trace_neg_unreq_dialect, dialect, 0);
1207			goto neg_exit;
1208		case SMB21_PROT_ID:
1209			/* ops set to 3.0 by default for default so update */
1210			server->ops = &smb21_operations;
1211			server->vals = &smb21_values;
1212			break;
1213		case SMB311_PROT_ID:
1214			server->ops = &smb311_operations;
1215			server->vals = &smb311_values;
1216			break;
1217		default:
1218			break;
1219		}
1220	} else if (dialect != server->vals->protocol_id) {
1221		/* if requested single dialect ensure returned dialect matched */
1222		cifs_server_dbg(VFS, "Invalid 0x%x dialect returned: not requested\n",
1223				dialect);
1224		rc = smb_EIO2(smb_eio_trace_neg_unreq_dialect,
1225			      dialect, server->vals->protocol_id);
1226		goto neg_exit;
1227	}
1228
1229	cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
1230
1231	switch (dialect) {
1232	case SMB20_PROT_ID:
1233		cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
1234		break;
1235	case SMB21_PROT_ID:
1236		cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
1237		break;
1238	case SMB30_PROT_ID:
1239		cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
1240		break;
1241	case SMB302_PROT_ID:
1242		cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
1243		break;
1244	case SMB311_PROT_ID:
1245		cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
1246		break;
1247	default:
1248		cifs_server_dbg(VFS, "Invalid dialect returned by server 0x%x\n",
1249				dialect);
1250		rc = smb_EIO1(smb_eio_trace_neg_inval_dialect, dialect);
1251		goto neg_exit;
1252	}
1253
1254	rc = 0;
1255	server->dialect = dialect;
1256
1257	/*
1258	 * Keep a copy of the hash after negprot. This hash will be
1259	 * the starting hash value for all sessions made from this
1260	 * server.
1261	 */
1262	memcpy(server->preauth_sha_hash, ses->preauth_sha_hash,
1263	       SMB2_PREAUTH_HASH_SIZE);
1264
1265	/* SMB2 only has an extended negflavor */
1266	server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
1267	/* set it to the maximum buffer size value we can send with 1 credit */
1268	server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
1269			       SMB2_MAX_BUFFER_SIZE);
1270	server->max_read = le32_to_cpu(rsp->MaxReadSize);
1271	server->max_write = le32_to_cpu(rsp->MaxWriteSize);
1272	server->sec_mode = le16_to_cpu(rsp->SecurityMode);
1273	if ((server->sec_mode & SMB2_SEC_MODE_FLAGS_ALL) != server->sec_mode)
1274		cifs_dbg(FYI, "Server returned unexpected security mode 0x%x\n",
1275				server->sec_mode);
1276	server->capabilities = le32_to_cpu(rsp->Capabilities);
1277	/* Internal types */
1278	server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
1279
1280	/*
1281	 * SMB3.0 supports only 1 cipher and doesn't have a encryption neg context
1282	 * Set the cipher type manually.
1283	 */
1284	if ((server->dialect == SMB30_PROT_ID ||
1285	     server->dialect == SMB302_PROT_ID) &&
1286	    (server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1287		server->cipher_type = SMB2_ENCRYPTION_AES128_CCM;
1288
1289	security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
1290					       (struct smb2_hdr *)rsp);
1291	/*
1292	 * See MS-SMB2 section 2.2.4: if no blob, client picks default which
1293	 * for us will be
1294	 *	ses->sectype = RawNTLMSSP;
1295	 * but for time being this is our only auth choice so doesn't matter.
1296	 * We just found a server which sets blob length to zero expecting raw.
1297	 */
1298	if (blob_length == 0) {
1299		cifs_dbg(FYI, "missing security blob on negprot\n");
1300		server->sec_ntlmssp = true;
1301	}
1302
1303	rc = cifs_enable_signing(server, ses->sign);
1304	if (rc)
1305		goto neg_exit;
1306	if (blob_length) {
1307		rc = decode_negTokenInit(security_blob, blob_length, server);
1308		if (rc == 1)
1309			rc = 0;
1310		else if (rc == 0)
1311			rc = smb_EIO1(smb_eio_trace_neg_decode_token, rc);
1312	}
1313
1314	if (server->dialect == SMB311_PROT_ID) {
1315		if (rsp->NegotiateContextCount)
1316			rc = smb311_decode_neg_context(rsp, server,
1317						       rsp_iov.iov_len);
1318		else
1319			cifs_server_dbg(VFS, "Missing expected negotiate contexts\n");
1320	}
1321
1322	if (server->cipher_type && !rc)
1323		rc = smb3_crypto_aead_allocate(server);
1324neg_exit:
1325	free_rsp_buf(resp_buftype, rsp);
1326	return rc;
1327}
1328
1329int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
1330{
1331	int rc;
1332	struct validate_negotiate_info_req *pneg_inbuf;
1333	struct validate_negotiate_info_rsp *pneg_rsp = NULL;
1334	u32 rsplen;
1335	u32 inbuflen; /* max of 4 dialects */
1336	struct TCP_Server_Info *server = tcon->ses->server;
1337
1338	cifs_dbg(FYI, "validate negotiate\n");
1339
1340	/* In SMB3.11 preauth integrity supersedes validate negotiate */
1341	if (server->dialect == SMB311_PROT_ID)
1342		return 0;
1343
1344	/*
1345	 * validation ioctl must be signed, so no point sending this if we
1346	 * can not sign it (ie are not known user).  Even if signing is not
1347	 * required (enabled but not negotiated), in those cases we selectively
1348	 * sign just this, the first and only signed request on a connection.
1349	 * Having validation of negotiate info  helps reduce attack vectors.
1350	 */
1351	if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
1352		return 0; /* validation requires signing */
1353
1354	if (tcon->ses->user_name == NULL) {
1355		cifs_dbg(FYI, "Can't validate negotiate: null user mount\n");
1356		return 0; /* validation requires signing */
1357	}
1358
1359	if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)
1360		cifs_tcon_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n");
1361
1362	pneg_inbuf = kmalloc(sizeof(*pneg_inbuf), GFP_NOFS);
1363	if (!pneg_inbuf)
1364		return -ENOMEM;
1365
1366	pneg_inbuf->Capabilities =
1367			cpu_to_le32(server->vals->req_capabilities);
1368	pneg_inbuf->Capabilities |= cpu_to_le32(SMB2_GLOBAL_CAP_MULTI_CHANNEL);
1369
1370	memcpy(pneg_inbuf->Guid, server->client_guid,
1371					SMB2_CLIENT_GUID_SIZE);
1372
1373	if (tcon->ses->sign)
1374		pneg_inbuf->SecurityMode =
1375			cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
1376	else if (global_secflags & CIFSSEC_MAY_SIGN)
1377		pneg_inbuf->SecurityMode =
1378			cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
1379	else
1380		pneg_inbuf->SecurityMode = 0;
1381
1382
1383	if (strcmp(server->vals->version_string,
1384		SMB3ANY_VERSION_STRING) == 0) {
1385		pneg_inbuf->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
1386		pneg_inbuf->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
1387		pneg_inbuf->Dialects[2] = cpu_to_le16(SMB311_PROT_ID);
1388		pneg_inbuf->DialectCount = cpu_to_le16(3);
1389		/* SMB 2.1 not included so subtract one dialect from len */
1390		inbuflen = sizeof(*pneg_inbuf) -
1391				(sizeof(pneg_inbuf->Dialects[0]));
1392	} else if (strcmp(server->vals->version_string,
1393		SMBDEFAULT_VERSION_STRING) == 0) {
1394		pneg_inbuf->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
1395		pneg_inbuf->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
1396		pneg_inbuf->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
1397		pneg_inbuf->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
1398		pneg_inbuf->DialectCount = cpu_to_le16(4);
1399		/* structure is big enough for 4 dialects */
1400		inbuflen = sizeof(*pneg_inbuf);
1401	} else {
1402		/* otherwise specific dialect was requested */
1403		pneg_inbuf->Dialects[0] =
1404			cpu_to_le16(server->vals->protocol_id);
1405		pneg_inbuf->DialectCount = cpu_to_le16(1);
1406		/* structure is big enough for 4 dialects, sending only 1 */
1407		inbuflen = sizeof(*pneg_inbuf) -
1408				sizeof(pneg_inbuf->Dialects[0]) * 3;
1409	}
1410
1411	rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
1412		FSCTL_VALIDATE_NEGOTIATE_INFO,
1413		(char *)pneg_inbuf, inbuflen, CIFSMaxBufSize,
1414		(char **)&pneg_rsp, &rsplen);
1415	if (rc == -EOPNOTSUPP) {
1416		/*
1417		 * Old Windows versions or Netapp SMB server can return
1418		 * not supported error. Client should accept it.
1419		 */
1420		cifs_tcon_dbg(VFS, "Server does not support validate negotiate\n");
1421		rc = 0;
1422		goto out_free_inbuf;
1423	} else if (rc != 0) {
1424		cifs_tcon_dbg(VFS, "validate protocol negotiate failed: %d\n",
1425			      rc);
1426		rc = smb_EIO1(smb_eio_trace_neg_info_fail, rc);
1427		goto out_free_inbuf;
1428	}
1429
1430	if (rsplen != sizeof(*pneg_rsp)) {
1431		cifs_tcon_dbg(VFS, "Invalid protocol negotiate response size: %d\n",
1432			      rsplen);
1433
1434		/* relax check since Mac returns max bufsize allowed on ioctl */
1435		if (rsplen > CIFSMaxBufSize || rsplen < sizeof(*pneg_rsp)) {
1436			rc = smb_EIO1(smb_eio_trace_neg_bad_rsplen, rsplen);
1437			goto out_free_rsp;
1438		}
1439	}
1440
1441	/* check validate negotiate info response matches what we got earlier */
1442	u16 dialect = le16_to_cpu(pneg_rsp->Dialect);
1443
1444	if (dialect != server->dialect) {
1445		rc = smb_EIO2(smb_eio_trace_neg_info_dialect,
1446			      dialect, server->dialect);
1447		goto vneg_out;
1448	}
1449
1450	u16 sec_mode = le16_to_cpu(pneg_rsp->SecurityMode);
1451
1452	if (sec_mode != server->sec_mode) {
1453		rc = smb_EIO2(smb_eio_trace_neg_info_sec_mode,
1454			      sec_mode, server->sec_mode);
1455		goto vneg_out;
1456	}
1457
1458	/* do not validate server guid because not saved at negprot time yet */
1459	u32 caps = le32_to_cpu(pneg_rsp->Capabilities);
1460
1461	if ((caps | SMB2_NT_FIND |
1462	     SMB2_LARGE_FILES) != server->capabilities) {
1463		rc = smb_EIO2(smb_eio_trace_neg_info_caps,
1464			      caps, server->capabilities);
1465		goto vneg_out;
1466	}
1467
1468	/* validate negotiate successful */
1469	rc = 0;
1470	cifs_dbg(FYI, "validate negotiate info successful\n");
1471	goto out_free_rsp;
1472
1473vneg_out:
1474	cifs_tcon_dbg(VFS, "protocol revalidation - security settings mismatch\n");
1475out_free_rsp:
1476	kfree(pneg_rsp);
1477out_free_inbuf:
1478	kfree(pneg_inbuf);
1479	return rc;
1480}
1481
1482enum securityEnum
1483smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
1484{
1485	switch (requested) {
1486	case Kerberos:
1487	case RawNTLMSSP:
1488		return requested;
1489	case NTLMv2:
1490		return RawNTLMSSP;
1491	case Unspecified:
1492		if (server->sec_ntlmssp &&
1493			(global_secflags & CIFSSEC_MAY_NTLMSSP))
1494			return RawNTLMSSP;
1495		if ((server->sec_kerberos || server->sec_mskerberos || server->sec_iakerb) &&
1496			(global_secflags & CIFSSEC_MAY_KRB5))
1497			return Kerberos;
1498		fallthrough;
1499	default:
1500		return Unspecified;
1501	}
1502}
1503
1504struct SMB2_sess_data {
1505	unsigned int xid;
1506	struct cifs_ses *ses;
1507	struct TCP_Server_Info *server;
1508	struct nls_table *nls_cp;
1509	void (*func)(struct SMB2_sess_data *);
1510	int result;
1511	u64 previous_session;
1512
1513	/* we will send the SMB in three pieces:
1514	 * a fixed length beginning part, an optional
1515	 * SPNEGO blob (which can be zero length), and a
1516	 * last part which will include the strings
1517	 * and rest of bcc area. This allows us to avoid
1518	 * a large buffer 17K allocation
1519	 */
1520	int buf0_type;
1521	struct kvec iov[2];
1522};
1523
1524static int
1525SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
1526{
1527	int rc;
1528	struct cifs_ses *ses = sess_data->ses;
1529	struct TCP_Server_Info *server = sess_data->server;
1530	struct smb2_sess_setup_req *req;
1531	unsigned int total_len;
1532	bool is_binding = false;
1533
1534	rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, server,
1535				 (void **) &req,
1536				 &total_len);
1537	if (rc)
1538		return rc;
1539
1540	spin_lock(&ses->ses_lock);
1541	is_binding = (ses->ses_status == SES_GOOD);
1542	spin_unlock(&ses->ses_lock);
1543
1544	if (is_binding) {
1545		req->hdr.SessionId = cpu_to_le64(ses->Suid);
1546		req->hdr.Flags |= SMB2_FLAGS_SIGNED;
1547		req->PreviousSessionId = 0;
1548		req->Flags = SMB2_SESSION_REQ_FLAG_BINDING;
1549		cifs_dbg(FYI, "Binding to sess id: %llx\n", ses->Suid);
1550	} else {
1551		/* First session, not a reauthenticate */
1552		req->hdr.SessionId = 0;
1553		/*
1554		 * if reconnect, we need to send previous sess id
1555		 * otherwise it is 0
1556		 */
1557		req->PreviousSessionId = cpu_to_le64(sess_data->previous_session);
1558		req->Flags = 0; /* MBZ */
1559		cifs_dbg(FYI, "Fresh session. Previous: %llx\n",
1560			 sess_data->previous_session);
1561	}
1562
1563	/* enough to enable echos and oplocks and one max size write */
1564	if (server->credits >= server->max_credits)
1565		req->hdr.CreditRequest = cpu_to_le16(0);
1566	else
1567		req->hdr.CreditRequest = cpu_to_le16(
1568			min_t(int, server->max_credits -
1569			      server->credits, 130));
1570
1571	/* only one of SMB2 signing flags may be set in SMB2 request */
1572	if (server->sign)
1573		req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
1574	else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
1575		req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
1576	else
1577		req->SecurityMode = 0;
1578
1579#ifdef CONFIG_CIFS_DFS_UPCALL
1580	req->Capabilities = cpu_to_le32(SMB2_GLOBAL_CAP_DFS);
1581#else
1582	req->Capabilities = 0;
1583#endif /* DFS_UPCALL */
1584
1585	req->Channel = 0; /* MBZ */
1586
1587	sess_data->iov[0].iov_base = (char *)req;
1588	/* 1 for pad */
1589	sess_data->iov[0].iov_len = total_len - 1;
1590	/*
1591	 * This variable will be used to clear the buffer
1592	 * allocated above in case of any error in the calling function.
1593	 */
1594	sess_data->buf0_type = CIFS_SMALL_BUFFER;
1595
1596	return 0;
1597}
1598
1599static void
1600SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)
1601{
1602	struct kvec *iov = sess_data->iov;
1603
1604	/* iov[1] is already freed by caller */
1605	if (sess_data->buf0_type != CIFS_NO_BUFFER && iov[0].iov_base)
1606		memzero_explicit(iov[0].iov_base, iov[0].iov_len);
1607
1608	free_rsp_buf(sess_data->buf0_type, iov[0].iov_base);
1609	sess_data->buf0_type = CIFS_NO_BUFFER;
1610}
1611
1612static int
1613SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
1614{
1615	int rc;
1616	struct smb_rqst rqst;
1617	struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
1618	struct kvec rsp_iov = { NULL, 0 };
1619
1620	/* Testing shows that buffer offset must be at location of Buffer[0] */
1621	req->SecurityBufferOffset =
1622		cpu_to_le16(sizeof(struct smb2_sess_setup_req));
1623	req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);
1624
1625	memset(&rqst, 0, sizeof(struct smb_rqst));
1626	rqst.rq_iov = sess_data->iov;
1627	rqst.rq_nvec = 2;
1628
1629	/* BB add code to build os and lm fields */
1630	rc = cifs_send_recv(sess_data->xid, sess_data->ses,
1631			    sess_data->server,
1632			    &rqst,
1633			    &sess_data->buf0_type,
1634			    CIFS_LOG_ERROR | CIFS_SESS_OP, &rsp_iov);
1635	cifs_small_buf_release(sess_data->iov[0].iov_base);
1636	if (rc == 0)
1637		sess_data->ses->expired_pwd = false;
1638	else if ((rc == -EACCES) || (rc == -EKEYEXPIRED) || (rc == -EKEYREVOKED)) {
1639		if (sess_data->ses->expired_pwd == false)
1640			trace_smb3_key_expired(sess_data->server->hostname,
1641					       sess_data->ses->user_name,
1642					       sess_data->server->conn_id,
1643					       &sess_data->server->dstaddr, rc);
1644		sess_data->ses->expired_pwd = true;
1645	}
1646
1647	memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
1648
1649	return rc;
1650}
1651
1652static int
1653SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)
1654{
1655	int rc = 0;
1656	struct cifs_ses *ses = sess_data->ses;
1657	struct TCP_Server_Info *server = sess_data->server;
1658
1659	cifs_server_lock(server);
1660	if (server->ops->generate_signingkey) {
1661		rc = server->ops->generate_signingkey(ses, server);
1662		if (rc) {
1663			cifs_dbg(FYI,
1664				"SMB3 session key generation failed\n");
1665			cifs_server_unlock(server);
1666			return rc;
1667		}
1668	}
1669	if (!server->session_estab) {
1670		server->sequence_number = 0x2;
1671		server->session_estab = true;
1672	}
1673	cifs_server_unlock(server);
1674
1675	cifs_dbg(FYI, "SMB2/3 session established successfully\n");
1676	return rc;
1677}
1678
1679#ifdef CONFIG_CIFS_UPCALL
1680static void
1681SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1682{
1683	int rc;
1684	struct cifs_ses *ses = sess_data->ses;
1685	struct TCP_Server_Info *server = sess_data->server;
1686	struct cifs_spnego_msg *msg;
1687	struct key *spnego_key = NULL;
1688	struct smb2_sess_setup_rsp *rsp = NULL;
1689	bool is_binding = false;
1690
1691	rc = SMB2_sess_alloc_buffer(sess_data);
1692	if (rc)
1693		goto out;
1694
1695	spnego_key = cifs_get_spnego_key(ses, server);
1696	if (IS_ERR(spnego_key)) {
1697		rc = PTR_ERR(spnego_key);
1698		spnego_key = NULL;
1699		goto out;
1700	}
1701
1702	msg = spnego_key->payload.data[0];
1703	/*
1704	 * check version field to make sure that cifs.upcall is
1705	 * sending us a response in an expected form
1706	 */
1707	if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1708		cifs_dbg(VFS, "bad cifs.upcall version. Expected %d got %d\n",
1709			 CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1710		rc = -EKEYREJECTED;
1711		goto out_put_spnego_key;
1712	}
1713
1714	spin_lock(&ses->ses_lock);
1715	is_binding = (ses->ses_status == SES_GOOD);
1716	spin_unlock(&ses->ses_lock);
1717
1718	kfree_sensitive(ses->auth_key.response);
1719	ses->auth_key.response = kmemdup(msg->data,
1720					 msg->sesskey_len,
1721					 GFP_KERNEL);
1722	if (!ses->auth_key.response) {
1723		cifs_dbg(VFS, "%s: can't allocate (%u bytes) memory\n",
1724			 __func__, msg->sesskey_len);
1725		rc = -ENOMEM;
1726		goto out_put_spnego_key;
1727	}
1728	ses->auth_key.len = msg->sesskey_len;
1729
1730	sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1731	sess_data->iov[1].iov_len = msg->secblob_len;
1732
1733	rc = SMB2_sess_sendreceive(sess_data);
1734	if (rc)
1735		goto out_put_spnego_key;
1736
1737	rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1738	/* keep session id and flags if binding */
1739	if (!is_binding) {
1740		ses->Suid = le64_to_cpu(rsp->hdr.SessionId);
1741		ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1742	}
1743
1744	rc = SMB2_sess_establish_session(sess_data);
1745out_put_spnego_key:
1746	key_invalidate(spnego_key);
1747	key_put(spnego_key);
1748	if (rc) {
1749		kfree_sensitive(ses->auth_key.response);
1750		ses->auth_key.response = NULL;
1751		ses->auth_key.len = 0;
1752	}
1753out:
1754	sess_data->result = rc;
1755	sess_data->func = NULL;
1756	SMB2_sess_free_buffer(sess_data);
1757}
1758#else
1759static void
1760SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1761{
1762	cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1763	sess_data->result = -EOPNOTSUPP;
1764	sess_data->func = NULL;
1765}
1766#endif
1767
1768static void
1769SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);
1770
1771static void
1772SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
1773{
1774	int rc;
1775	struct cifs_ses *ses = sess_data->ses;
1776	struct TCP_Server_Info *server = sess_data->server;
1777	struct smb2_sess_setup_rsp *rsp = NULL;
1778	unsigned char *ntlmssp_blob = NULL;
1779	bool use_spnego = false; /* else use raw ntlmssp */
1780	u16 blob_length = 0;
1781	bool is_binding = false;
1782
1783	/*
1784	 * If memory allocation is successful, caller of this function
1785	 * frees it.
1786	 */
1787	ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1788	if (!ses->ntlmssp) {
1789		rc = -ENOMEM;
1790		goto out_err;
1791	}
1792	ses->ntlmssp->sesskey_per_smbsess = true;
1793
1794	rc = SMB2_sess_alloc_buffer(sess_data);
1795	if (rc)
1796		goto out_err;
1797
1798	rc = build_ntlmssp_smb3_negotiate_blob(&ntlmssp_blob,
1799					  &blob_length, ses, server,
1800					  sess_data->nls_cp);
1801	if (rc)
1802		goto out;
1803
1804	if (use_spnego) {
1805		/* BB eventually need to add this */
1806		cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1807		rc = -EOPNOTSUPP;
1808		goto out;
1809	}
1810	sess_data->iov[1].iov_base = ntlmssp_blob;
1811	sess_data->iov[1].iov_len = blob_length;
1812
1813	rc = SMB2_sess_sendreceive(sess_data);
1814	rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1815
1816	/* If true, rc here is expected and not an error */
1817	if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1818		rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
1819		rc = 0;
1820
1821	if (rc)
1822		goto out;
1823
1824	u16 boff = le16_to_cpu(rsp->SecurityBufferOffset);
1825
1826	if (offsetof(struct smb2_sess_setup_rsp, Buffer) != boff) {
1827		cifs_dbg(VFS, "Invalid security buffer offset %d\n", boff);
1828		rc = smb_EIO1(smb_eio_trace_sess_buf_off, boff);
1829		goto out;
1830	}
1831	rc = decode_ntlmssp_challenge(rsp->Buffer,
1832			le16_to_cpu(rsp->SecurityBufferLength), ses);
1833	if (rc)
1834		goto out;
1835
1836	cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1837
1838	spin_lock(&ses->ses_lock);
1839	is_binding = (ses->ses_status == SES_GOOD);
1840	spin_unlock(&ses->ses_lock);
1841
1842	/* keep existing ses id and flags if binding */
1843	if (!is_binding) {
1844		ses->Suid = le64_to_cpu(rsp->hdr.SessionId);
1845		ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1846	}
1847
1848out:
1849	kfree_sensitive(ntlmssp_blob);
1850	SMB2_sess_free_buffer(sess_data);
1851	if (!rc) {
1852		sess_data->result = 0;
1853		sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
1854		return;
1855	}
1856out_err:
1857	kfree_sensitive(ses->ntlmssp);
1858	ses->ntlmssp = NULL;
1859	sess_data->result = rc;
1860	sess_data->func = NULL;
1861}
1862
1863static void
1864SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
1865{
1866	int rc;
1867	struct cifs_ses *ses = sess_data->ses;
1868	struct TCP_Server_Info *server = sess_data->server;
1869	struct smb2_sess_setup_req *req;
1870	struct smb2_sess_setup_rsp *rsp = NULL;
1871	unsigned char *ntlmssp_blob = NULL;
1872	bool use_spnego = false; /* else use raw ntlmssp */
1873	u16 blob_length = 0;
1874	bool is_binding = false;
1875
1876	rc = SMB2_sess_alloc_buffer(sess_data);
1877	if (rc)
1878		goto out;
1879
1880	req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
1881	req->hdr.SessionId = cpu_to_le64(ses->Suid);
1882
1883	rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length,
1884				     ses, server,
1885				     sess_data->nls_cp);
1886	if (rc) {
1887		cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
1888		goto out;
1889	}
1890
1891	if (use_spnego) {
1892		/* BB eventually need to add this */
1893		cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1894		rc = -EOPNOTSUPP;
1895		goto out;
1896	}
1897	sess_data->iov[1].iov_base = ntlmssp_blob;
1898	sess_data->iov[1].iov_len = blob_length;
1899
1900	rc = SMB2_sess_sendreceive(sess_data);
1901	if (rc)
1902		goto out;
1903
1904	rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1905
1906	spin_lock(&ses->ses_lock);
1907	is_binding = (ses->ses_status == SES_GOOD);
1908	spin_unlock(&ses->ses_lock);
1909
1910	/* keep existing ses id and flags if binding */
1911	if (!is_binding) {
1912		ses->Suid = le64_to_cpu(rsp->hdr.SessionId);
1913		ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1914	}
1915
1916	rc = SMB2_sess_establish_session(sess_data);
1917#ifdef CONFIG_CIFS_DEBUG_DUMP_KEYS
1918	if (ses->server->dialect < SMB30_PROT_ID) {
1919		cifs_dbg(VFS, "%s: dumping generated SMB2 session keys\n", __func__);
1920		/*
1921		 * The session id is opaque in terms of endianness, so we can't
1922		 * print it as a long long. we dump it as we got it on the wire
1923		 */
1924		cifs_dbg(VFS, "Session Id    %*ph\n", (int)sizeof(ses->Suid),
1925			 &ses->Suid);
1926		cifs_dbg(VFS, "Session Key   %*ph\n",
1927			 SMB2_NTLMV2_SESSKEY_SIZE, ses->auth_key.response);
1928		cifs_dbg(VFS, "Signing Key   %*ph\n",
1929			 SMB3_SIGN_KEY_SIZE, ses->auth_key.response);
1930	}
1931#endif
1932out:
1933	kfree_sensitive(ntlmssp_blob);
1934	SMB2_sess_free_buffer(sess_data);
1935	kfree_sensitive(ses->ntlmssp);
1936	ses->ntlmssp = NULL;
1937	sess_data->result = rc;
1938	sess_data->func = NULL;
1939}
1940
1941static int
1942SMB2_select_sec(struct SMB2_sess_data *sess_data)
1943{
1944	int type;
1945	struct cifs_ses *ses = sess_data->ses;
1946	struct TCP_Server_Info *server = sess_data->server;
1947
1948	type = smb2_select_sectype(server, ses->sectype);
1949	cifs_dbg(FYI, "sess setup type %d\n", type);
1950	if (type == Unspecified) {
1951		cifs_dbg(VFS, "Unable to select appropriate authentication method!\n");
1952		return -EINVAL;
1953	}
1954
1955	switch (type) {
1956	case Kerberos:
1957		sess_data->func = SMB2_auth_kerberos;
1958		break;
1959	case RawNTLMSSP:
1960		sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
1961		break;
1962	default:
1963		cifs_dbg(VFS, "secType %d not supported!\n", type);
1964		return -EOPNOTSUPP;
1965	}
1966
1967	return 0;
1968}
1969
1970int
1971SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
1972		struct TCP_Server_Info *server,
1973		const struct nls_table *nls_cp)
1974{
1975	int rc = 0;
1976	struct SMB2_sess_data *sess_data;
1977
1978	cifs_dbg(FYI, "Session Setup\n");
1979
1980	if (!server) {
1981		WARN(1, "%s: server is NULL!\n", __func__);
1982		return smb_EIO(smb_eio_trace_null_pointers);
1983	}
1984
1985	sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
1986	if (!sess_data)
1987		return -ENOMEM;
1988
1989	sess_data->xid = xid;
1990	sess_data->ses = ses;
1991	sess_data->server = server;
1992	sess_data->buf0_type = CIFS_NO_BUFFER;
1993	sess_data->nls_cp = (struct nls_table *) nls_cp;
1994	sess_data->previous_session = ses->Suid;
1995
1996	rc = SMB2_select_sec(sess_data);
1997	if (rc)
1998		goto out;
1999
2000	/*
2001	 * Initialize the session hash with the server one.
2002	 */
2003	memcpy(ses->preauth_sha_hash, server->preauth_sha_hash,
2004	       SMB2_PREAUTH_HASH_SIZE);
2005
2006	while (sess_data->func)
2007		sess_data->func(sess_data);
2008
2009	if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign))
2010		cifs_server_dbg(VFS, "signing requested but authenticated as guest\n");
2011	rc = sess_data->result;
2012out:
2013	kfree_sensitive(sess_data);
2014	return rc;
2015}
2016
2017int
2018SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
2019{
2020	struct smb_rqst rqst;
2021	struct smb2_logoff_req *req; /* response is also trivial struct */
2022	int rc = 0;
2023	struct TCP_Server_Info *server;
2024	int flags = 0;
2025	unsigned int total_len;
2026	struct kvec iov[1];
2027	struct kvec rsp_iov;
2028	int resp_buf_type;
2029
2030	cifs_dbg(FYI, "disconnect session %p\n", ses);
2031
2032	if (!ses || !ses->server)
2033		return smb_EIO(smb_eio_trace_null_pointers);
2034	server = ses->server;
2035
2036	/* no need to send SMB logoff if uid already closed due to reconnect */
2037	spin_lock(&ses->chan_lock);
2038	if (CIFS_ALL_CHANS_NEED_RECONNECT(ses)) {
2039		spin_unlock(&ses->chan_lock);
2040		goto smb2_session_already_dead;
2041	}
2042	spin_unlock(&ses->chan_lock);
2043
2044	rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, ses->server,
2045				 (void **) &req, &total_len);
2046	if (rc)
2047		return rc;
2048
2049	 /* since no tcon, smb2_init can not do this, so do here */
2050	req->hdr.SessionId = cpu_to_le64(ses->Suid);
2051
2052	if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
2053		flags |= CIFS_TRANSFORM_REQ;
2054	else if (server->sign)
2055		req->hdr.Flags |= SMB2_FLAGS_SIGNED;
2056
2057	flags |= CIFS_NO_RSP_BUF;
2058
2059	iov[0].iov_base = (char *)req;
2060	iov[0].iov_len = total_len;
2061
2062	memset(&rqst, 0, sizeof(struct smb_rqst));
2063	rqst.rq_iov = iov;
2064	rqst.rq_nvec = 1;
2065
2066	rc = cifs_send_recv(xid, ses, ses->server,
2067			    &rqst, &resp_buf_type, flags, &rsp_iov);
2068	cifs_small_buf_release(req);
2069	/*
2070	 * No tcon so can't do
2071	 * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
2072	 */
2073
2074smb2_session_already_dead:
2075	return rc;
2076}
2077
2078static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
2079{
2080	cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
2081}
2082
2083#define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
2084
2085/* These are similar values to what Windows uses */
2086static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
2087{
2088	tcon->max_chunks = 256;
2089	tcon->max_bytes_chunk = 1048576;
2090	tcon->max_bytes_copy = 16777216;
2091}
2092
2093int
2094SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
2095	  struct cifs_tcon *tcon, const struct nls_table *cp)
2096{
2097	struct smb_rqst rqst;
2098	struct smb2_tree_connect_req *req;
2099	struct smb2_tree_connect_rsp *rsp = NULL;
2100	struct kvec iov[2];
2101	struct kvec rsp_iov = { NULL, 0 };
2102	int rc = 0;
2103	int resp_buftype;
2104	int unc_path_len;
2105	__le16 *unc_path = NULL;
2106	int flags = 0;
2107	unsigned int total_len;
2108	struct TCP_Server_Info *server = cifs_pick_channel(ses);
2109
2110	cifs_dbg(FYI, "TCON\n");
2111
2112	if (!server || !tree)
2113		return smb_EIO(smb_eio_trace_null_pointers);
2114
2115	unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
2116	if (unc_path == NULL)
2117		return -ENOMEM;
2118
2119	unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp);
2120	if (unc_path_len <= 0) {
2121		kfree(unc_path);
2122		return -EINVAL;
2123	}
2124	unc_path_len *= 2;
2125
2126	/* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
2127	tcon->tid = 0;
2128	atomic_set(&tcon->num_remote_opens, 0);
2129	rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, server,
2130				 (void **) &req, &total_len);
2131	if (rc) {
2132		kfree(unc_path);
2133		return rc;
2134	}
2135
2136	if (smb3_encryption_required(tcon))
2137		flags |= CIFS_TRANSFORM_REQ;
2138
2139	iov[0].iov_base = (char *)req;
2140	/* 1 for pad */
2141	iov[0].iov_len = total_len - 1;
2142
2143	/* Testing shows that buffer offset must be at location of Buffer[0] */
2144	req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req));
2145	req->PathLength = cpu_to_le16(unc_path_len);
2146	iov[1].iov_base = unc_path;
2147	iov[1].iov_len = unc_path_len;
2148
2149	/*
2150	 * 3.11 tcon req must be signed if not encrypted. See MS-SMB2 3.2.4.1.1
2151	 * unless it is guest or anonymous user. See MS-SMB2 3.2.5.3.1
2152	 * (Samba servers don't always set the flag so also check if null user)
2153	 */
2154	if ((server->dialect == SMB311_PROT_ID) &&
2155	    !smb3_encryption_required(tcon) &&
2156	    !(ses->session_flags &
2157		    (SMB2_SESSION_FLAG_IS_GUEST|SMB2_SESSION_FLAG_IS_NULL)) &&
2158	    ((ses->user_name != NULL) || (ses->sectype == Kerberos)))
2159		req->hdr.Flags |= SMB2_FLAGS_SIGNED;
2160
2161	memset(&rqst, 0, sizeof(struct smb_rqst));
2162	rqst.rq_iov = iov;
2163	rqst.rq_nvec = 2;
2164
2165	/* Need 64 for max size write so ask for more in case not there yet */
2166	if (server->credits >= server->max_credits)
2167		req->hdr.CreditRequest = cpu_to_le16(0);
2168	else
2169		req->hdr.CreditRequest = cpu_to_le16(
2170			min_t(int, server->max_credits -
2171			      server->credits, 64));
2172
2173	rc = cifs_send_recv(xid, ses, server,
2174			    &rqst, &resp_buftype, flags, &rsp_iov);
2175	cifs_small_buf_release(req);
2176	rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
2177	trace_smb3_tcon(xid, tcon->tid, ses->Suid, tree, rc);
2178	if ((rc != 0) || (rsp == NULL)) {
2179		cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
2180		tcon->need_reconnect = true;
2181		goto tcon_error_exit;
2182	}
2183
2184	switch (rsp->ShareType) {
2185	case SMB2_SHARE_TYPE_DISK:
2186		cifs_dbg(FYI, "connection to disk share\n");
2187		break;
2188	case SMB2_SHARE_TYPE_PIPE:
2189		tcon->pipe = true;
2190		cifs_dbg(FYI, "connection to pipe share\n");
2191		break;
2192	case SMB2_SHARE_TYPE_PRINT:
2193		tcon->print = true;
2194		cifs_dbg(FYI, "connection to printer\n");
2195		break;
2196	default:
2197		cifs_server_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
2198		rc = -EOPNOTSUPP;
2199		goto tcon_error_exit;
2200	}
2201
2202	tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
2203	tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
2204	tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
2205	tcon->tid = le32_to_cpu(rsp->hdr.Id.SyncId.TreeId);
2206	strscpy(tcon->tree_name, tree, sizeof(tcon->tree_name));
2207
2208	if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
2209	    ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
2210		cifs_tcon_dbg(VFS, "DFS capability contradicts DFS flag\n");
2211
2212	if (tcon->seal &&
2213	    !(server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
2214		cifs_tcon_dbg(VFS, "Encryption is requested but not supported\n");
2215
2216	init_copy_chunk_defaults(tcon);
2217	if (server->ops->validate_negotiate)
2218		rc = server->ops->validate_negotiate(xid, tcon);
2219	if (rc == 0) /* See MS-SMB2 2.2.10 and 3.2.5.5 */
2220		if (tcon->share_flags & SMB2_SHAREFLAG_ISOLATED_TRANSPORT)
2221			server->nosharesock = true;
2222tcon_exit:
2223
2224	free_rsp_buf(resp_buftype, rsp);
2225	kfree(unc_path);
2226	return rc;
2227
2228tcon_error_exit:
2229	if (rsp && rsp->hdr.Status == STATUS_BAD_NETWORK_NAME)
2230		cifs_dbg(VFS | ONCE, "BAD_NETWORK_NAME: %s\n", tree);
2231	goto tcon_exit;
2232}
2233
2234int
2235SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
2236{
2237	struct smb_rqst rqst;
2238	struct smb2_tree_disconnect_req *req; /* response is trivial */
2239	int rc = 0;
2240	struct cifs_ses *ses = tcon->ses;
2241	struct TCP_Server_Info *server = cifs_pick_channel(ses);
2242	int flags = 0;
2243	unsigned int total_len;
2244	struct kvec iov[1];
2245	struct kvec rsp_iov;
2246	int resp_buf_type;
2247
2248	cifs_dbg(FYI, "Tree Disconnect\n");
2249
2250	if (!ses || !(ses->server))
2251		return smb_EIO(smb_eio_trace_null_pointers);
2252
2253	trace_smb3_tdis_enter(xid, tcon->tid, ses->Suid, tcon->tree_name);
2254	spin_lock(&ses->chan_lock);
2255	if ((tcon->need_reconnect) ||
2256	    (CIFS_ALL_CHANS_NEED_RECONNECT(tcon->ses))) {
2257		spin_unlock(&ses->chan_lock);
2258		return 0;
2259	}
2260	spin_unlock(&ses->chan_lock);
2261
2262	invalidate_all_cached_dirs(tcon);
2263
2264	rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, server,
2265				 (void **) &req,
2266				 &total_len);
2267	if (rc)
2268		return rc;
2269
2270	if (smb3_encryption_required(tcon))
2271		flags |= CIFS_TRANSFORM_REQ;
2272
2273	flags |= CIFS_NO_RSP_BUF;
2274
2275	iov[0].iov_base = (char *)req;
2276	iov[0].iov_len = total_len;
2277
2278	memset(&rqst, 0, sizeof(struct smb_rqst));
2279	rqst.rq_iov = iov;
2280	rqst.rq_nvec = 1;
2281
2282	rc = cifs_send_recv(xid, ses, server,
2283			    &rqst, &resp_buf_type, flags, &rsp_iov);
2284	cifs_small_buf_release(req);
2285	if (rc) {
2286		cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
2287		trace_smb3_tdis_err(xid, tcon->tid, ses->Suid, rc);
2288	}
2289	trace_smb3_tdis_done(xid, tcon->tid, ses->Suid);
2290
2291	return rc;
2292}
2293
2294static create_durable_req_t *
2295create_durable_buf(void)
2296{
2297	create_durable_req_t *buf;
2298
2299	buf = kzalloc(sizeof(create_durable_req_t), GFP_KERNEL);
2300	if (!buf)
2301		return NULL;
2302
2303	buf->ccontext.DataOffset = cpu_to_le16(offsetof
2304					(create_durable_req_t, Data));
2305	buf->ccontext.DataLength = cpu_to_le32(16);
2306	buf->ccontext.NameOffset = cpu_to_le16(offsetof
2307				(create_durable_req_t, Name));
2308	buf->ccontext.NameLength = cpu_to_le16(4);
2309	/* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
2310	buf->Name[0] = 'D';
2311	buf->Name[1] = 'H';
2312	buf->Name[2] = 'n';
2313	buf->Name[3] = 'Q';
2314	return buf;
2315}
2316
2317static create_durable_req_t *
2318create_reconnect_durable_buf(struct cifs_fid *fid)
2319{
2320	create_durable_req_t *buf;
2321
2322	buf = kzalloc(sizeof(create_durable_req_t), GFP_KERNEL);
2323	if (!buf)
2324		return NULL;
2325
2326	buf->ccontext.DataOffset = cpu_to_le16(offsetof
2327					(create_durable_req_t, Data));
2328	buf->ccontext.DataLength = cpu_to_le32(16);
2329	buf->ccontext.NameOffset = cpu_to_le16(offsetof
2330				(create_durable_req_t, Name));
2331	buf->ccontext.NameLength = cpu_to_le16(4);
2332	buf->Data.Fid.PersistentFileId = fid->persistent_fid;
2333	buf->Data.Fid.VolatileFileId = fid->volatile_fid;
2334	/* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
2335	buf->Name[0] = 'D';
2336	buf->Name[1] = 'H';
2337	buf->Name[2] = 'n';
2338	buf->Name[3] = 'C';
2339	return buf;
2340}
2341
2342static void
2343parse_query_id_ctxt(struct create_context *cc, struct smb2_file_all_info *buf)
2344{
2345	struct create_disk_id_rsp *pdisk_id = (struct create_disk_id_rsp *)cc;
2346
2347	cifs_dbg(FYI, "parse query id context 0x%llx 0x%llx\n",
2348		pdisk_id->DiskFileId, pdisk_id->VolumeId);
2349	buf->IndexNumber = pdisk_id->DiskFileId;
2350}
2351
2352static void
2353parse_posix_ctxt(struct create_context *cc, struct smb2_file_all_info *info,
2354		 struct create_posix_rsp *posix)
2355{
2356	int sid_len;
2357	u8 *beg = (u8 *)cc + le16_to_cpu(cc->DataOffset);
2358	u8 *end = beg + le32_to_cpu(cc->DataLength);
2359	u8 *sid;
2360
2361	memset(posix, 0, sizeof(*posix));
2362
2363	posix->nlink = le32_to_cpu(*(__le32 *)(beg + 0));
2364	posix->reparse_tag = le32_to_cpu(*(__le32 *)(beg + 4));
2365	posix->mode = le32_to_cpu(*(__le32 *)(beg + 8));
2366
2367	sid = beg + 12;
2368	sid_len = posix_info_sid_size(sid, end);
2369	if (sid_len < 0) {
2370		cifs_dbg(VFS, "bad owner sid in posix create response\n");
2371		return;
2372	}
2373	memcpy(&posix->owner, sid, sid_len);
2374
2375	sid = sid + sid_len;
2376	sid_len = posix_info_sid_size(sid, end);
2377	if (sid_len < 0) {
2378		cifs_dbg(VFS, "bad group sid in posix create response\n");
2379		return;
2380	}
2381	memcpy(&posix->group, sid, sid_len);
2382
2383	cifs_dbg(FYI, "nlink=%d mode=%o reparse_tag=%x\n",
2384		 posix->nlink, posix->mode, posix->reparse_tag);
2385}
2386
2387int smb2_parse_contexts(struct TCP_Server_Info *server,
2388			struct kvec *rsp_iov,
2389			__u16 *epoch,
2390			char *lease_key, __u8 *oplock,
2391			struct smb2_file_all_info *buf,
2392			struct create_posix_rsp *posix)
2393{
2394	struct smb2_create_rsp *rsp = rsp_iov->iov_base;
2395	struct create_context *cc;
2396	size_t rem, off, len;
2397	size_t doff, dlen;
2398	size_t noff, nlen;
2399	char *name;
2400	static const char smb3_create_tag_posix[] = {
2401		0x93, 0xAD, 0x25, 0x50, 0x9C,
2402		0xB4, 0x11, 0xE7, 0xB4, 0x23, 0x83,
2403		0xDE, 0x96, 0x8B, 0xCD, 0x7C
2404	};
2405
2406	*oplock = 0;
2407
2408	off = le32_to_cpu(rsp->CreateContextsOffset);
2409	rem = le32_to_cpu(rsp->CreateContextsLength);
2410	if (check_add_overflow(off, rem, &len) || len > rsp_iov->iov_len)
2411		return -EINVAL;
2412	cc = (struct create_context *)((u8 *)rsp + off);
2413
2414	/* Initialize inode number to 0 in case no valid data in qfid context */
2415	if (buf)
2416		buf->IndexNumber = 0;
2417
2418	while (rem >= sizeof(*cc)) {
2419		doff = le16_to_cpu(cc->DataOffset);
2420		dlen = le32_to_cpu(cc->DataLength);
2421		if (check_add_overflow(doff, dlen, &len) || len > rem)
2422			return -EINVAL;
2423
2424		noff = le16_to_cpu(cc->NameOffset);
2425		nlen = le16_to_cpu(cc->NameLength);
2426		if (noff + nlen > doff)
2427			return -EINVAL;
2428
2429		name = (char *)cc + noff;
2430		switch (nlen) {
2431		case 4:
2432			if (!strncmp(name, SMB2_CREATE_REQUEST_LEASE, 4)) {
2433				*oplock = server->ops->parse_lease_buf(cc, epoch,
2434								       lease_key);
2435			} else if (buf &&
2436				   !strncmp(name, SMB2_CREATE_QUERY_ON_DISK_ID, 4)) {
2437				parse_query_id_ctxt(cc, buf);
2438			}
2439			break;
2440		case 16:
2441			if (posix && !memcmp(name, smb3_create_tag_posix, 16))
2442				parse_posix_ctxt(cc, buf, posix);
2443			break;
2444		default:
2445			cifs_dbg(FYI, "%s: unhandled context (nlen=%zu dlen=%zu)\n",
2446				 __func__, nlen, dlen);
2447			if (IS_ENABLED(CONFIG_CIFS_DEBUG2))
2448				cifs_dump_mem("context data: ", cc, dlen);
2449			break;
2450		}
2451
2452		off = le32_to_cpu(cc->Next);
2453		if (!off)
2454			break;
2455		if (check_sub_overflow(rem, off, &rem))
2456			return -EINVAL;
2457		cc = (struct create_context *)((u8 *)cc + off);
2458	}
2459
2460	if (rsp->OplockLevel != SMB2_OPLOCK_LEVEL_LEASE)
2461		*oplock = rsp->OplockLevel;
2462
2463	return 0;
2464}
2465
2466static int
2467add_lease_context(struct TCP_Server_Info *server,
2468		  struct smb2_create_req *req,
2469		  struct kvec *iov,
2470		  unsigned int *num_iovec,
2471		  u8 *lease_key,
2472		  __u8 *oplock,
2473		  u8 *parent_lease_key,
2474		  __le32 flags)
2475{
2476	unsigned int num = *num_iovec;
2477
2478	iov[num].iov_base = server->ops->create_lease_buf(lease_key, *oplock,
2479							  parent_lease_key, flags);
2480	if (iov[num].iov_base == NULL)
2481		return -ENOMEM;
2482	iov[num].iov_len = server->vals->create_lease_size;
2483	req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
2484	*num_iovec = num + 1;
2485	return 0;
2486}
2487
2488static struct create_durable_req_v2 *
2489create_durable_v2_buf(struct cifs_open_parms *oparms)
2490{
2491	struct cifs_fid *pfid = oparms->fid;
2492	struct create_durable_req_v2 *buf;
2493
2494	buf = kzalloc(sizeof(struct create_durable_req_v2), GFP_KERNEL);
2495	if (!buf)
2496		return NULL;
2497
2498	buf->ccontext.DataOffset = cpu_to_le16(offsetof
2499					(struct create_durable_req_v2, dcontext));
2500	buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2_req));
2501	buf->ccontext.NameOffset = cpu_to_le16(offsetof
2502				(struct create_durable_req_v2, Name));
2503	buf->ccontext.NameLength = cpu_to_le16(4);
2504
2505	/*
2506	 * NB: Handle timeout defaults to 0, which allows server to choose
2507	 * (most servers default to 120 seconds) and most clients default to 0.
2508	 * This can be overridden at mount ("handletimeout=") if the user wants
2509	 * a different persistent (or resilient) handle timeout for all opens
2510	 * on a particular SMB3 mount.
2511	 */
2512	buf->dcontext.Timeout = cpu_to_le32(oparms->tcon->handle_timeout);
2513	buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
2514
2515	/* for replay, we should not overwrite the existing create guid */
2516	if (!oparms->replay) {
2517		generate_random_uuid(buf->dcontext.CreateGuid);
2518		memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
2519	} else
2520		memcpy(buf->dcontext.CreateGuid, pfid->create_guid, 16);
2521
2522	/* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
2523	buf->Name[0] = 'D';
2524	buf->Name[1] = 'H';
2525	buf->Name[2] = '2';
2526	buf->Name[3] = 'Q';
2527	return buf;
2528}
2529
2530static struct create_durable_handle_reconnect_v2 *
2531create_reconnect_durable_v2_buf(struct cifs_fid *fid)
2532{
2533	struct create_durable_handle_reconnect_v2 *buf;
2534
2535	buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
2536			GFP_KERNEL);
2537	if (!buf)
2538		return NULL;
2539
2540	buf->ccontext.DataOffset =
2541		cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2542				     dcontext));
2543	buf->ccontext.DataLength =
2544		cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
2545	buf->ccontext.NameOffset =
2546		cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2547			    Name));
2548	buf->ccontext.NameLength = cpu_to_le16(4);
2549
2550	buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
2551	buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
2552	buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
2553	memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
2554
2555	/* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
2556	buf->Name[0] = 'D';
2557	buf->Name[1] = 'H';
2558	buf->Name[2] = '2';
2559	buf->Name[3] = 'C';
2560	return buf;
2561}
2562
2563static int
2564add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
2565		    struct cifs_open_parms *oparms)
2566{
2567	unsigned int num = *num_iovec;
2568
2569	iov[num].iov_base = create_durable_v2_buf(oparms);
2570	if (iov[num].iov_base == NULL)
2571		return -ENOMEM;
2572	iov[num].iov_len = sizeof(struct create_durable_req_v2);
2573	*num_iovec = num + 1;
2574	return 0;
2575}
2576
2577static int
2578add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
2579		    struct cifs_open_parms *oparms)
2580{
2581	unsigned int num = *num_iovec;
2582
2583	/* indicate that we don't need to relock the file */
2584	oparms->reconnect = false;
2585
2586	iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
2587	if (iov[num].iov_base == NULL)
2588		return -ENOMEM;
2589	iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
2590	*num_iovec = num + 1;
2591	return 0;
2592}
2593
2594static int
2595add_durable_context(struct kvec *iov, unsigned int *num_iovec,
2596		    struct cifs_open_parms *oparms, bool use_persistent)
2597{
2598	unsigned int num = *num_iovec;
2599
2600	if (use_persistent) {
2601		if (oparms->reconnect)
2602			return add_durable_reconnect_v2_context(iov, num_iovec,
2603								oparms);
2604		else
2605			return add_durable_v2_context(iov, num_iovec, oparms);
2606	}
2607
2608	if (oparms->reconnect) {
2609		iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
2610		/* indicate that we don't need to relock the file */
2611		oparms->reconnect = false;
2612	} else
2613		iov[num].iov_base = create_durable_buf();
2614	if (iov[num].iov_base == NULL)
2615		return -ENOMEM;
2616	iov[num].iov_len = sizeof(create_durable_req_t);
2617	*num_iovec = num + 1;
2618	return 0;
2619}
2620
2621/* See MS-SMB2 2.2.13.2.7 */
2622static struct crt_twarp_ctxt *
2623create_twarp_buf(__u64 timewarp)
2624{
2625	struct crt_twarp_ctxt *buf;
2626
2627	buf = kzalloc(sizeof(struct crt_twarp_ctxt), GFP_KERNEL);
2628	if (!buf)
2629		return NULL;
2630
2631	buf->ccontext.DataOffset = cpu_to_le16(offsetof
2632					(struct crt_twarp_ctxt, Timestamp));
2633	buf->ccontext.DataLength = cpu_to_le32(8);
2634	buf->ccontext.NameOffset = cpu_to_le16(offsetof
2635				(struct crt_twarp_ctxt, Name));
2636	buf->ccontext.NameLength = cpu_to_le16(4);
2637	/* SMB2_CREATE_TIMEWARP_TOKEN is "TWrp" */
2638	buf->Name[0] = 'T';
2639	buf->Name[1] = 'W';
2640	buf->Name[2] = 'r';
2641	buf->Name[3] = 'p';
2642	buf->Timestamp = cpu_to_le64(timewarp);
2643	return buf;
2644}
2645
2646/* See MS-SMB2 2.2.13.2.7 */
2647static int
2648add_twarp_context(struct kvec *iov, unsigned int *num_iovec, __u64 timewarp)
2649{
2650	unsigned int num = *num_iovec;
2651
2652	iov[num].iov_base = create_twarp_buf(timewarp);
2653	if (iov[num].iov_base == NULL)
2654		return -ENOMEM;
2655	iov[num].iov_len = sizeof(struct crt_twarp_ctxt);
2656	*num_iovec = num + 1;
2657	return 0;
2658}
2659
2660/* See http://technet.microsoft.com/en-us/library/hh509017(v=ws.10).aspx */
2661static void setup_owner_group_sids(char *buf)
2662{
2663	struct owner_group_sids *sids = (struct owner_group_sids *)buf;
2664
2665	/* Populate the user ownership fields S-1-5-88-1 */
2666	sids->owner.Revision = 1;
2667	sids->owner.NumAuth = 3;
2668	sids->owner.Authority[5] = 5;
2669	sids->owner.SubAuthorities[0] = cpu_to_le32(88);
2670	sids->owner.SubAuthorities[1] = cpu_to_le32(1);
2671	sids->owner.SubAuthorities[2] = cpu_to_le32(current_fsuid().val);
2672
2673	/* Populate the group ownership fields S-1-5-88-2 */
2674	sids->group.Revision = 1;
2675	sids->group.NumAuth = 3;
2676	sids->group.Authority[5] = 5;
2677	sids->group.SubAuthorities[0] = cpu_to_le32(88);
2678	sids->group.SubAuthorities[1] = cpu_to_le32(2);
2679	sids->group.SubAuthorities[2] = cpu_to_le32(current_fsgid().val);
2680
2681	cifs_dbg(FYI, "owner S-1-5-88-1-%d, group S-1-5-88-2-%d\n", current_fsuid().val, current_fsgid().val);
2682}
2683
2684/* See MS-SMB2 2.2.13.2.2 and MS-DTYP 2.4.6 */
2685static struct crt_sd_ctxt *
2686create_sd_buf(umode_t mode, bool set_owner, unsigned int *len)
2687{
2688	struct crt_sd_ctxt *buf;
2689	__u8 *ptr, *aclptr;
2690	unsigned int acelen, acl_size, ace_count;
2691	unsigned int owner_offset = 0;
2692	unsigned int group_offset = 0;
2693	struct smb3_acl acl = {};
2694
2695	*len = round_up(sizeof(struct crt_sd_ctxt) + (sizeof(struct smb_ace) * 4), 8);
2696
2697	if (set_owner) {
2698		/* sizeof(struct owner_group_sids) is already multiple of 8 so no need to round */
2699		*len += sizeof(struct owner_group_sids);
2700	}
2701
2702	buf = kzalloc(*len, GFP_KERNEL);
2703	if (buf == NULL)
2704		return buf;
2705
2706	ptr = (__u8 *)&buf[1];
2707	if (set_owner) {
2708		/* offset fields are from beginning of security descriptor not of create context */
2709		owner_offset = ptr - (__u8 *)&buf->sd;
2710		buf->sd.OffsetOwner = cpu_to_le32(owner_offset);
2711		group_offset = owner_offset + offsetof(struct owner_group_sids, group);
2712		buf->sd.OffsetGroup = cpu_to_le32(group_offset);
2713
2714		setup_owner_group_sids(ptr);
2715		ptr += sizeof(struct owner_group_sids);
2716	} else {
2717		buf->sd.OffsetOwner = 0;
2718		buf->sd.OffsetGroup = 0;
2719	}
2720
2721	buf->ccontext.DataOffset = cpu_to_le16(offsetof(struct crt_sd_ctxt, sd));
2722	buf->ccontext.NameOffset = cpu_to_le16(offsetof(struct crt_sd_ctxt, Name));
2723	buf->ccontext.NameLength = cpu_to_le16(4);
2724	/* SMB2_CREATE_SD_BUFFER_TOKEN is "SecD" */
2725	buf->Name[0] = 'S';
2726	buf->Name[1] = 'e';
2727	buf->Name[2] = 'c';
2728	buf->Name[3] = 'D';
2729	buf->sd.Revision = 1;  /* Must be one see MS-DTYP 2.4.6 */
2730
2731	/*
2732	 * ACL is "self relative" ie ACL is stored in contiguous block of memory
2733	 * and "DP" ie the DACL is present
2734	 */
2735	buf->sd.Control = cpu_to_le16(ACL_CONTROL_SR | ACL_CONTROL_DP);
2736
2737	/* offset owner, group and Sbz1 and SACL are all zero */
2738	buf->sd.OffsetDacl = cpu_to_le32(ptr - (__u8 *)&buf->sd);
2739	/* Ship the ACL for now. we will copy it into buf later. */
2740	aclptr = ptr;
2741	ptr += sizeof(struct smb3_acl);
2742
2743	/* create one ACE to hold the mode embedded in reserved special SID */
2744	acelen = setup_special_mode_ACE((struct smb_ace *)ptr, false, (__u64)mode);
2745	ptr += acelen;
2746	acl_size = acelen + sizeof(struct smb3_acl);
2747	ace_count = 1;
2748
2749	if (set_owner) {
2750		/* we do not need to reallocate buffer to add the two more ACEs. plenty of space */
2751		acelen = setup_special_user_owner_ACE((struct smb_ace *)ptr);
2752		ptr += acelen;
2753		acl_size += acelen;
2754		ace_count += 1;
2755	}
2756
2757	/* and one more ACE to allow access for authenticated users */
2758	acelen = setup_authusers_ACE((struct smb_ace *)ptr);
2759	ptr += acelen;
2760	acl_size += acelen;
2761	ace_count += 1;
2762
2763	acl.AclRevision = ACL_REVISION; /* See 2.4.4.1 of MS-DTYP */
2764	acl.AclSize = cpu_to_le16(acl_size);
2765	acl.AceCount = cpu_to_le16(ace_count);
2766	/* acl.Sbz1 and Sbz2 MBZ so are not set here, but initialized above */
2767	memcpy(aclptr, &acl, sizeof(struct smb3_acl));
2768
2769	buf->ccontext.DataLength = cpu_to_le32(ptr - (__u8 *)&buf->sd);
2770	*len = round_up((unsigned int)(ptr - (__u8 *)buf), 8);
2771
2772	return buf;
2773}
2774
2775static int
2776add_sd_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode, bool set_owner)
2777{
2778	unsigned int num = *num_iovec;
2779	unsigned int len = 0;
2780
2781	iov[num].iov_base = create_sd_buf(mode, set_owner, &len);
2782	if (iov[num].iov_base == NULL)
2783		return -ENOMEM;
2784	iov[num].iov_len = len;
2785	*num_iovec = num + 1;
2786	return 0;
2787}
2788
2789static struct crt_query_id_ctxt *
2790create_query_id_buf(void)
2791{
2792	struct crt_query_id_ctxt *buf;
2793
2794	buf = kzalloc(sizeof(struct crt_query_id_ctxt), GFP_KERNEL);
2795	if (!buf)
2796		return NULL;
2797
2798	buf->ccontext.DataOffset = cpu_to_le16(0);
2799	buf->ccontext.DataLength = cpu_to_le32(0);
2800	buf->ccontext.NameOffset = cpu_to_le16(offsetof
2801				(struct crt_query_id_ctxt, Name));
2802	buf->ccontext.NameLength = cpu_to_le16(4);
2803	/* SMB2_CREATE_QUERY_ON_DISK_ID is "QFid" */
2804	buf->Name[0] = 'Q';
2805	buf->Name[1] = 'F';
2806	buf->Name[2] = 'i';
2807	buf->Name[3] = 'd';
2808	return buf;
2809}
2810
2811/* See MS-SMB2 2.2.13.2.9 */
2812static int
2813add_query_id_context(struct kvec *iov, unsigned int *num_iovec)
2814{
2815	unsigned int num = *num_iovec;
2816
2817	iov[num].iov_base = create_query_id_buf();
2818	if (iov[num].iov_base == NULL)
2819		return -ENOMEM;
2820	iov[num].iov_len = sizeof(struct crt_query_id_ctxt);
2821	*num_iovec = num + 1;
2822	return 0;
2823}
2824
2825static void add_ea_context(struct cifs_open_parms *oparms,
2826			   struct kvec *rq_iov, unsigned int *num_iovs)
2827{
2828	struct kvec *iov = oparms->ea_cctx;
2829
2830	if (iov && iov->iov_base && iov->iov_len) {
2831		rq_iov[(*num_iovs)++] = *iov;
2832		memset(iov, 0, sizeof(*iov));
2833	}
2834}
2835
2836static int
2837alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
2838			    const char *treename, const __le16 *path)
2839{
2840	int treename_len, path_len;
2841	struct nls_table *cp;
2842	const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
2843
2844	/*
2845	 * skip leading "\\"
2846	 */
2847	treename_len = strlen(treename);
2848	if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
2849		return -EINVAL;
2850
2851	treename += 2;
2852	treename_len -= 2;
2853
2854	path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
2855
2856	/* make room for one path separator only if @path isn't empty */
2857	*out_len = treename_len + (path[0] ? 1 : 0) + path_len;
2858
2859	/*
2860	 * final path needs to be 8-byte aligned as specified in
2861	 * MS-SMB2 2.2.13 SMB2 CREATE Request.
2862	 */
2863	*out_size = round_up(*out_len * sizeof(__le16), 8);
2864	*out_path = kzalloc(*out_size + sizeof(__le16) /* null */, GFP_KERNEL);
2865	if (!*out_path)
2866		return -ENOMEM;
2867
2868	cp = load_nls_default();
2869	cifs_strtoUTF16(*out_path, treename, treename_len, cp);
2870
2871	/* Do not append the separator if the path is empty */
2872	if (path[0] != cpu_to_le16(0x0000)) {
2873		UniStrcat((wchar_t *)*out_path, (wchar_t *)sep);
2874		UniStrcat((wchar_t *)*out_path, (wchar_t *)path);
2875	}
2876
2877	unload_nls(cp);
2878
2879	return 0;
2880}
2881
2882int smb311_posix_mkdir(const unsigned int xid, struct inode *inode,
2883			       umode_t mode, struct cifs_tcon *tcon,
2884			       const char *full_path,
2885			       struct cifs_sb_info *cifs_sb)
2886{
2887	struct smb_rqst rqst;
2888	struct smb2_create_req *req;
2889	struct smb2_create_rsp *rsp = NULL;
2890	struct cifs_ses *ses = tcon->ses;
2891	struct kvec iov[3]; /* make sure at least one for each open context */
2892	struct kvec rsp_iov = {NULL, 0};
2893	int resp_buftype;
2894	int uni_path_len;
2895	__le16 *copy_path = NULL;
2896	int copy_size;
2897	int rc = 0;
2898	unsigned int n_iov = 2;
2899	__u32 file_attributes = 0;
2900	char *pc_buf = NULL;
2901	int flags = 0;
2902	unsigned int total_len;
2903	__le16 *utf16_path = NULL;
2904	struct TCP_Server_Info *server;
2905	int retries = 0, cur_sleep = 1;
2906
2907replay_again:
2908	/* reinitialize for possible replay */
2909	pc_buf = NULL;
2910	flags = 0;
2911	n_iov = 2;
2912	server = cifs_pick_channel(ses);
2913
2914	cifs_dbg(FYI, "mkdir\n");
2915
2916	/* resource #1: path allocation */
2917	utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
2918	if (!utf16_path)
2919		return -ENOMEM;
2920
2921	if (!ses || !server) {
2922		rc = smb_EIO(smb_eio_trace_null_pointers);
2923		goto err_free_path;
2924	}
2925
2926	/* resource #2: request */
2927	rc = smb2_plain_req_init(SMB2_CREATE, tcon, server,
2928				 (void **) &req, &total_len);
2929	if (rc)
2930		goto err_free_path;
2931
2932
2933	if (smb3_encryption_required(tcon))
2934		flags |= CIFS_TRANSFORM_REQ;
2935
2936	req->ImpersonationLevel = IL_IMPERSONATION;
2937	req->DesiredAccess = cpu_to_le32(FILE_WRITE_ATTRIBUTES);
2938	/* File attributes ignored on open (used in create though) */
2939	req->FileAttributes = cpu_to_le32(file_attributes);
2940	req->ShareAccess = FILE_SHARE_ALL_LE;
2941	req->CreateDisposition = cpu_to_le32(FILE_CREATE);
2942	req->CreateOptions = cpu_to_le32(CREATE_NOT_FILE);
2943
2944	iov[0].iov_base = (char *)req;
2945	/* -1 since last byte is buf[0] which is sent below (path) */
2946	iov[0].iov_len = total_len - 1;
2947
2948	req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2949
2950	/* [MS-SMB2] 2.2.13 NameOffset:
2951	 * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2952	 * the SMB2 header, the file name includes a prefix that will
2953	 * be processed during DFS name normalization as specified in
2954	 * section 3.3.5.9. Otherwise, the file name is relative to
2955	 * the share that is identified by the TreeId in the SMB2
2956	 * header.
2957	 */
2958	if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2959		int name_len;
2960
2961		req->hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2962		rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2963						 &name_len,
2964						 tcon->tree_name, utf16_path);
2965		if (rc)
2966			goto err_free_req;
2967
2968		req->NameLength = cpu_to_le16(name_len * 2);
2969		uni_path_len = copy_size;
2970		/* free before overwriting resource */
2971		kfree(utf16_path);
2972		utf16_path = copy_path;
2973	} else {
2974		uni_path_len = (2 * UniStrnlen((wchar_t *)utf16_path, PATH_MAX)) + 2;
2975		/* MUST set path len (NameLength) to 0 opening root of share */
2976		req->NameLength = cpu_to_le16(uni_path_len - 2);
2977		if (uni_path_len % 8 != 0) {
2978			copy_size = roundup(uni_path_len, 8);
2979			copy_path = kzalloc(copy_size, GFP_KERNEL);
2980			if (!copy_path) {
2981				rc = -ENOMEM;
2982				goto err_free_req;
2983			}
2984			memcpy((char *)copy_path, (const char *)utf16_path,
2985			       uni_path_len);
2986			uni_path_len = copy_size;
2987			/* free before overwriting resource */
2988			kfree(utf16_path);
2989			utf16_path = copy_path;
2990		}
2991	}
2992
2993	iov[1].iov_len = uni_path_len;
2994	iov[1].iov_base = utf16_path;
2995	req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;
2996
2997	if (tcon->posix_extensions) {
2998		/* resource #3: posix buf */
2999		rc = add_posix_context(iov, &n_iov, mode);
3000		if (rc)
3001			goto err_free_req;
3002		req->CreateContextsOffset = cpu_to_le32(
3003			sizeof(struct smb2_create_req) +
3004			iov[1].iov_len);
3005		le32_add_cpu(&req->CreateContextsLength, iov[n_iov-1].iov_len);
3006		pc_buf = iov[n_iov-1].iov_base;
3007	}
3008
3009
3010	memset(&rqst, 0, sizeof(struct smb_rqst));
3011	rqst.rq_iov = iov;
3012	rqst.rq_nvec = n_iov;
3013
3014	/* no need to inc num_remote_opens because we close it just below */
3015	trace_smb3_posix_mkdir_enter(xid, tcon->tid, ses->Suid, full_path, CREATE_NOT_FILE,
3016				    FILE_WRITE_ATTRIBUTES);
3017
3018	if (retries)
3019		smb2_set_replay(server, &rqst);
3020
3021	/* resource #4: response buffer */
3022	rc = cifs_send_recv(xid, ses, server,
3023			    &rqst, &resp_buftype, flags, &rsp_iov);
3024	if (rc) {
3025		cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
3026		trace_smb3_posix_mkdir_err(xid, tcon->tid, ses->Suid,
3027					   CREATE_NOT_FILE,
3028					   FILE_WRITE_ATTRIBUTES, rc);
3029		goto err_free_rsp_buf;
3030	}
3031
3032	/*
3033	 * Although unlikely to be possible for rsp to be null and rc not set,
3034	 * adding check below is slightly safer long term (and quiets Coverity
3035	 * warning)
3036	 */
3037	rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
3038	if (rsp == NULL) {
3039		rc = smb_EIO(smb_eio_trace_mkdir_no_rsp);
3040		kfree(pc_buf);
3041		goto err_free_req;
3042	}
3043
3044	trace_smb3_posix_mkdir_done(xid, rsp->PersistentFileId, tcon->tid, ses->Suid,
3045				    CREATE_NOT_FILE, FILE_WRITE_ATTRIBUTES);
3046
3047	SMB2_close(xid, tcon, rsp->PersistentFileId, rsp->VolatileFileId);
3048
3049	/* Eventually save off posix specific response info and timestamps */
3050
3051err_free_rsp_buf:
3052	free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3053	kfree(pc_buf);
3054err_free_req:
3055	cifs_small_buf_release(req);
3056err_free_path:
3057	kfree(utf16_path);
3058
3059	if (is_replayable_error(rc) &&
3060	    smb2_should_replay(tcon, &retries, &cur_sleep))
3061		goto replay_again;
3062
3063	return rc;
3064}
3065
3066int
3067SMB2_open_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3068	       struct smb_rqst *rqst, __u8 *oplock,
3069	       struct cifs_open_parms *oparms, __le16 *path)
3070{
3071	struct smb2_create_req *req;
3072	unsigned int n_iov = 2;
3073	__u32 file_attributes = 0;
3074	int copy_size;
3075	int uni_path_len;
3076	unsigned int total_len;
3077	struct kvec *iov = rqst->rq_iov;
3078	__le16 *copy_path;
3079	int rc;
3080
3081	rc = smb2_plain_req_init(SMB2_CREATE, tcon, server,
3082				 (void **) &req, &total_len);
3083	if (rc)
3084		return rc;
3085
3086	iov[0].iov_base = (char *)req;
3087	/* -1 since last byte is buf[0] which is sent below (path) */
3088	iov[0].iov_len = total_len - 1;
3089
3090	if (oparms->create_options & CREATE_OPTION_READONLY)
3091		file_attributes |= ATTR_READONLY;
3092	if (oparms->create_options & CREATE_OPTION_SPECIAL)
3093		file_attributes |= ATTR_SYSTEM;
3094
3095	req->ImpersonationLevel = IL_IMPERSONATION;
3096	req->DesiredAccess = cpu_to_le32(oparms->desired_access);
3097	/* File attributes ignored on open (used in create though) */
3098	req->FileAttributes = cpu_to_le32(file_attributes);
3099	req->ShareAccess = FILE_SHARE_ALL_LE;
3100
3101	req->CreateDisposition = cpu_to_le32(oparms->disposition);
3102	req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
3103	req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
3104
3105	/* [MS-SMB2] 2.2.13 NameOffset:
3106	 * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
3107	 * the SMB2 header, the file name includes a prefix that will
3108	 * be processed during DFS name normalization as specified in
3109	 * section 3.3.5.9. Otherwise, the file name is relative to
3110	 * the share that is identified by the TreeId in the SMB2
3111	 * header.
3112	 */
3113	if (tcon->share_flags & SHI1005_FLAGS_DFS) {
3114		int name_len;
3115
3116		req->hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
3117		rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
3118						 &name_len,
3119						 tcon->tree_name, path);
3120		if (rc)
3121			return rc;
3122		req->NameLength = cpu_to_le16(name_len * 2);
3123		uni_path_len = copy_size;
3124		path = copy_path;
3125	} else {
3126		uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
3127		/* MUST set path len (NameLength) to 0 opening root of share */
3128		req->NameLength = cpu_to_le16(uni_path_len - 2);
3129		copy_size = round_up(uni_path_len, 8);
3130		copy_path = kzalloc(copy_size, GFP_KERNEL);
3131		if (!copy_path)
3132			return -ENOMEM;
3133		memcpy((char *)copy_path, (const char *)path,
3134		       uni_path_len);
3135		uni_path_len = copy_size;
3136		path = copy_path;
3137	}
3138
3139	iov[1].iov_len = uni_path_len;
3140	iov[1].iov_base = path;
3141
3142	if ((!server->oplocks) || (tcon->no_lease))
3143		*oplock = SMB2_OPLOCK_LEVEL_NONE;
3144
3145	if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
3146	    *oplock == SMB2_OPLOCK_LEVEL_NONE)
3147		req->RequestedOplockLevel = *oplock;
3148	else if (!(server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING) &&
3149		  (oparms->create_options & CREATE_NOT_FILE))
3150		req->RequestedOplockLevel = *oplock; /* no srv lease support */
3151	else {
3152		rc = add_lease_context(server, req, iov, &n_iov,
3153				       oparms->fid->lease_key, oplock,
3154				       oparms->fid->parent_lease_key,
3155				       oparms->lease_flags);
3156		if (rc)
3157			return rc;
3158	}
3159
3160	if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
3161		rc = add_durable_context(iov, &n_iov, oparms,
3162					tcon->use_persistent);
3163		if (rc)
3164			return rc;
3165	}
3166
3167	if (tcon->posix_extensions) {
3168		rc = add_posix_context(iov, &n_iov, oparms->mode);
3169		if (rc)
3170			return rc;
3171	}
3172
3173	if (tcon->snapshot_time) {
3174		cifs_dbg(FYI, "adding snapshot context\n");
3175		rc = add_twarp_context(iov, &n_iov, tcon->snapshot_time);
3176		if (rc)
3177			return rc;
3178	}
3179
3180	if ((oparms->disposition != FILE_OPEN) && (oparms->cifs_sb)) {
3181		bool set_mode;
3182		bool set_owner;
3183
3184		if ((oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID) &&
3185		    (oparms->mode != ACL_NO_MODE))
3186			set_mode = true;
3187		else {
3188			set_mode = false;
3189			oparms->mode = ACL_NO_MODE;
3190		}
3191
3192		if (oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
3193			set_owner = true;
3194		else
3195			set_owner = false;
3196
3197		if (set_owner | set_mode) {
3198			cifs_dbg(FYI, "add sd with mode 0x%x\n", oparms->mode);
3199			rc = add_sd_context(iov, &n_iov, oparms->mode, set_owner);
3200			if (rc)
3201				return rc;
3202		}
3203	}
3204
3205	add_query_id_context(iov, &n_iov);
3206	add_ea_context(oparms, iov, &n_iov);
3207
3208	if (n_iov > 2) {
3209		/*
3210		 * We have create contexts behind iov[1] (the file
3211		 * name), point at them from the main create request
3212		 */
3213		req->CreateContextsOffset = cpu_to_le32(
3214			sizeof(struct smb2_create_req) +
3215			iov[1].iov_len);
3216		req->CreateContextsLength = 0;
3217
3218		for (unsigned int i = 2; i < (n_iov-1); i++) {
3219			struct kvec *v = &iov[i];
3220			size_t len = v->iov_len;
3221			struct create_context *cctx =
3222				(struct create_context *)v->iov_base;
3223
3224			cctx->Next = cpu_to_le32(len);
3225			le32_add_cpu(&req->CreateContextsLength, len);
3226		}
3227		le32_add_cpu(&req->CreateContextsLength,
3228			     iov[n_iov-1].iov_len);
3229	}
3230
3231	rqst->rq_nvec = n_iov;
3232	return 0;
3233}
3234
3235/* rq_iov[0] is the request and is released by cifs_small_buf_release().
3236 * All other vectors are freed by kfree().
3237 */
3238void
3239SMB2_open_free(struct smb_rqst *rqst)
3240{
3241	int i;
3242
3243	if (rqst && rqst->rq_iov) {
3244		cifs_small_buf_release(rqst->rq_iov[0].iov_base);
3245		for (i = 1; i < rqst->rq_nvec; i++)
3246			if (rqst->rq_iov[i].iov_base != smb2_padding)
3247				kfree(rqst->rq_iov[i].iov_base);
3248	}
3249}
3250
3251int
3252SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
3253	  __u8 *oplock, struct smb2_file_all_info *buf,
3254	  struct create_posix_rsp *posix,
3255	  struct kvec *err_iov, int *buftype)
3256{
3257	struct smb_rqst rqst;
3258	struct smb2_create_rsp *rsp = NULL;
3259	struct cifs_tcon *tcon = oparms->tcon;
3260	struct cifs_ses *ses = tcon->ses;
3261	struct TCP_Server_Info *server;
3262	struct kvec iov[SMB2_CREATE_IOV_SIZE];
3263	struct kvec rsp_iov = {NULL, 0};
3264	int resp_buftype = CIFS_NO_BUFFER;
3265	int rc = 0;
3266	int flags = 0;
3267	int retries = 0, cur_sleep = 1;
3268
3269replay_again:
3270	/* reinitialize for possible replay */
3271	flags = 0;
3272	server = cifs_pick_channel(ses);
3273	oparms->replay = !!(retries);
3274
3275	cifs_dbg(FYI, "create/open\n");
3276	if (!ses || !server)
3277		return smb_EIO(smb_eio_trace_null_pointers);
3278
3279	if (smb3_encryption_required(tcon))
3280		flags |= CIFS_TRANSFORM_REQ;
3281
3282	memset(&rqst, 0, sizeof(struct smb_rqst));
3283	memset(&iov, 0, sizeof(iov));
3284	rqst.rq_iov = iov;
3285	rqst.rq_nvec = SMB2_CREATE_IOV_SIZE;
3286
3287	rc = SMB2_open_init(tcon, server,
3288			    &rqst, oplock, oparms, path);
3289	if (rc)
3290		goto creat_exit;
3291
3292	trace_smb3_open_enter(xid, tcon->tid, tcon->ses->Suid, oparms->path,
3293		oparms->create_options, oparms->desired_access);
3294
3295	if (retries)
3296		smb2_set_replay(server, &rqst);
3297
3298	rc = cifs_send_recv(xid, ses, server,
3299			    &rqst, &resp_buftype, flags,
3300			    &rsp_iov);
3301	rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
3302
3303	if (rc != 0) {
3304		cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
3305		if (err_iov && rsp) {
3306			*err_iov = rsp_iov;
3307			*buftype = resp_buftype;
3308			resp_buftype = CIFS_NO_BUFFER;
3309			rsp = NULL;
3310		}
3311		trace_smb3_open_err(xid, tcon->tid, ses->Suid,
3312				    oparms->create_options, oparms->desired_access, rc);
3313		if (rc == -EREMCHG) {
3314			pr_warn_once("server share %s deleted\n",
3315				     tcon->tree_name);
3316			tcon->need_reconnect = true;
3317		}
3318		goto creat_exit;
3319	} else if (rsp == NULL) /* unlikely to happen, but safer to check */
3320		goto creat_exit;
3321	else
3322		trace_smb3_open_done(xid, rsp->PersistentFileId, tcon->tid, ses->Suid,
3323				     oparms->create_options, oparms->desired_access);
3324
3325	atomic_inc(&tcon->num_remote_opens);
3326	oparms->fid->persistent_fid = rsp->PersistentFileId;
3327	oparms->fid->volatile_fid = rsp->VolatileFileId;
3328	oparms->fid->access = oparms->desired_access;
3329#ifdef CONFIG_CIFS_DEBUG2
3330	oparms->fid->mid = le64_to_cpu(rsp->hdr.MessageId);
3331#endif /* CIFS_DEBUG2 */
3332
3333	if (buf) {
3334		buf->CreationTime = rsp->CreationTime;
3335		buf->LastAccessTime = rsp->LastAccessTime;
3336		buf->LastWriteTime = rsp->LastWriteTime;
3337		buf->ChangeTime = rsp->ChangeTime;
3338		buf->AllocationSize = rsp->AllocationSize;
3339		buf->EndOfFile = rsp->EndofFile;
3340		buf->Attributes = rsp->FileAttributes;
3341		buf->NumberOfLinks = cpu_to_le32(1);
3342		buf->DeletePending = 0; /* successful open = not delete pending */
3343	}
3344
3345
3346	rc = smb2_parse_contexts(server, &rsp_iov, &oparms->fid->epoch,
3347				 oparms->fid->lease_key, oplock, buf, posix);
3348creat_exit:
3349	SMB2_open_free(&rqst);
3350	free_rsp_buf(resp_buftype, rsp);
3351
3352	if (is_replayable_error(rc) &&
3353	    smb2_should_replay(tcon, &retries, &cur_sleep))
3354		goto replay_again;
3355
3356	return rc;
3357}
3358
3359int
3360SMB2_ioctl_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3361		struct smb_rqst *rqst,
3362		u64 persistent_fid, u64 volatile_fid, u32 opcode,
3363		char *in_data, u32 indatalen,
3364		__u32 max_response_size)
3365{
3366	struct smb2_ioctl_req *req;
3367	struct kvec *iov = rqst->rq_iov;
3368	unsigned int total_len;
3369	int rc;
3370	char *in_data_buf;
3371
3372	rc = smb2_ioctl_req_init(opcode, tcon, server,
3373				 (void **) &req, &total_len);
3374	if (rc)
3375		return rc;
3376
3377	if (indatalen) {
3378		/*
3379		 * indatalen is usually small at a couple of bytes max, so
3380		 * just allocate through generic pool
3381		 */
3382		in_data_buf = kmemdup(in_data, indatalen, GFP_NOFS);
3383		if (!in_data_buf) {
3384			cifs_small_buf_release(req);
3385			return -ENOMEM;
3386		}
3387	}
3388
3389	req->CtlCode = cpu_to_le32(opcode);
3390	req->PersistentFileId = persistent_fid;
3391	req->VolatileFileId = volatile_fid;
3392
3393	iov[0].iov_base = (char *)req;
3394	/*
3395	 * If no input data, the size of ioctl struct in
3396	 * protocol spec still includes a 1 byte data buffer,
3397	 * but if input data passed to ioctl, we do not
3398	 * want to double count this, so we do not send
3399	 * the dummy one byte of data in iovec[0] if sending
3400	 * input data (in iovec[1]).
3401	 */
3402	if (indatalen) {
3403		req->InputCount = cpu_to_le32(indatalen);
3404		/* do not set InputOffset if no input data */
3405		req->InputOffset =
3406		       cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer));
3407		rqst->rq_nvec = 2;
3408		iov[0].iov_len = total_len - 1;
3409		iov[1].iov_base = in_data_buf;
3410		iov[1].iov_len = indatalen;
3411	} else {
3412		rqst->rq_nvec = 1;
3413		iov[0].iov_len = total_len;
3414	}
3415
3416	req->OutputOffset = 0;
3417	req->OutputCount = 0; /* MBZ */
3418
3419	/*
3420	 * In most cases max_response_size is set to 16K (CIFSMaxBufSize)
3421	 * We Could increase default MaxOutputResponse, but that could require
3422	 * more credits. Windows typically sets this smaller, but for some
3423	 * ioctls it may be useful to allow server to send more. No point
3424	 * limiting what the server can send as long as fits in one credit
3425	 * We can not handle more than CIFS_MAX_BUF_SIZE yet but may want
3426	 * to increase this limit up in the future.
3427	 * Note that for snapshot queries that servers like Azure expect that
3428	 * the first query be minimal size (and just used to get the number/size
3429	 * of previous versions) so response size must be specified as EXACTLY
3430	 * sizeof(struct snapshot_array) which is 16 when rounded up to multiple
3431	 * of eight bytes.  Currently that is the only case where we set max
3432	 * response size smaller.
3433	 */
3434	req->MaxOutputResponse = cpu_to_le32(max_response_size);
3435	req->hdr.CreditCharge =
3436		cpu_to_le16(DIV_ROUND_UP(max(indatalen, max_response_size),
3437					 SMB2_MAX_BUFFER_SIZE));
3438	/* always an FSCTL (for now) */
3439	req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
3440
3441	/* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
3442	if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
3443		req->hdr.Flags |= SMB2_FLAGS_SIGNED;
3444
3445	return 0;
3446}
3447
3448void
3449SMB2_ioctl_free(struct smb_rqst *rqst)
3450{
3451	int i;
3452
3453	if (rqst && rqst->rq_iov) {
3454		cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3455		for (i = 1; i < rqst->rq_nvec; i++)
3456			if (rqst->rq_iov[i].iov_base != smb2_padding)
3457				kfree(rqst->rq_iov[i].iov_base);
3458	}
3459}
3460
3461
3462/*
3463 *	SMB2 IOCTL is used for both IOCTLs and FSCTLs
3464 */
3465int
3466SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3467	   u64 volatile_fid, u32 opcode, char *in_data, u32 indatalen,
3468	   u32 max_out_data_len, char **out_data,
3469	   u32 *plen /* returned data len */)
3470{
3471	struct smb_rqst rqst;
3472	struct smb2_ioctl_rsp *rsp = NULL;
3473	struct cifs_ses *ses;
3474	struct TCP_Server_Info *server;
3475	struct kvec iov[SMB2_IOCTL_IOV_SIZE];
3476	struct kvec rsp_iov = {NULL, 0};
3477	int resp_buftype = CIFS_NO_BUFFER;
3478	int rc = 0;
3479	int flags = 0;
3480	int retries = 0, cur_sleep = 1;
3481
3482	if (!tcon)
3483		return smb_EIO(smb_eio_trace_null_pointers);
3484
3485	ses = tcon->ses;
3486	if (!ses)
3487		return smb_EIO(smb_eio_trace_null_pointers);
3488
3489replay_again:
3490	/* reinitialize for possible replay */
3491	flags = 0;
3492	server = cifs_pick_channel(ses);
3493
3494	if (!server)
3495		return smb_EIO(smb_eio_trace_null_pointers);
3496
3497	cifs_dbg(FYI, "SMB2 IOCTL\n");
3498
3499	if (out_data != NULL)
3500		*out_data = NULL;
3501
3502	/* zero out returned data len, in case of error */
3503	if (plen)
3504		*plen = 0;
3505
3506	if (smb3_encryption_required(tcon))
3507		flags |= CIFS_TRANSFORM_REQ;
3508
3509	memset(&rqst, 0, sizeof(struct smb_rqst));
3510	memset(&iov, 0, sizeof(iov));
3511	rqst.rq_iov = iov;
3512	rqst.rq_nvec = SMB2_IOCTL_IOV_SIZE;
3513
3514	rc = SMB2_ioctl_init(tcon, server,
3515			     &rqst, persistent_fid, volatile_fid, opcode,
3516			     in_data, indatalen, max_out_data_len);
3517	if (rc)
3518		goto ioctl_exit;
3519
3520	if (retries)
3521		smb2_set_replay(server, &rqst);
3522
3523	rc = cifs_send_recv(xid, ses, server,
3524			    &rqst, &resp_buftype, flags,
3525			    &rsp_iov);
3526	rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
3527
3528	if (rc != 0)
3529		trace_smb3_fsctl_err(xid, persistent_fid, tcon->tid,
3530				ses->Suid, 0, opcode, rc);
3531
3532	if ((rc != 0) && (rc != -EINVAL) && (rc != -E2BIG)) {
3533		cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3534		goto ioctl_exit;
3535	} else if (rc == -EINVAL) {
3536		if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
3537		    (opcode != FSCTL_SRV_COPYCHUNK)) {
3538			cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3539			goto ioctl_exit;
3540		}
3541	} else if (rc == -E2BIG) {
3542		if (opcode != FSCTL_QUERY_ALLOCATED_RANGES) {
3543			cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3544			goto ioctl_exit;
3545		}
3546	}
3547
3548	/* check if caller wants to look at return data or just return rc */
3549	if ((plen == NULL) || (out_data == NULL))
3550		goto ioctl_exit;
3551
3552	/*
3553	 * Although unlikely to be possible for rsp to be null and rc not set,
3554	 * adding check below is slightly safer long term (and quiets Coverity
3555	 * warning)
3556	 */
3557	if (rsp == NULL) {
3558		rc = smb_EIO(smb_eio_trace_ioctl_no_rsp);
3559		goto ioctl_exit;
3560	}
3561
3562	*plen = le32_to_cpu(rsp->OutputCount);
3563
3564	/* We check for obvious errors in the output buffer length and offset */
3565	if (*plen == 0)
3566		goto ioctl_exit; /* server returned no data */
3567	else if (*plen > rsp_iov.iov_len || *plen > 0xFF00) {
3568		cifs_tcon_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
3569		rc = smb_EIO2(smb_eio_trace_ioctl_data_len, *plen, rsp_iov.iov_len);
3570		*plen = 0;
3571		goto ioctl_exit;
3572	}
3573
3574	u32 outoff = le32_to_cpu(rsp->OutputOffset);
3575
3576	if (rsp_iov.iov_len - *plen < outoff) {
3577		cifs_tcon_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n",
3578			      *plen, outoff);
3579		rc = smb_EIO2(smb_eio_trace_ioctl_out_off, rsp_iov.iov_len - *plen, outoff);
3580		*plen = 0;
3581		goto ioctl_exit;
3582	}
3583
3584	*out_data = kmemdup((char *)rsp + le32_to_cpu(rsp->OutputOffset),
3585			    *plen, GFP_KERNEL);
3586	if (*out_data == NULL) {
3587		rc = -ENOMEM;
3588		goto ioctl_exit;
3589	}
3590
3591ioctl_exit:
3592	SMB2_ioctl_free(&rqst);
3593	free_rsp_buf(resp_buftype, rsp);
3594
3595	if (is_replayable_error(rc) &&
3596	    smb2_should_replay(tcon, &retries, &cur_sleep))
3597		goto replay_again;
3598
3599	return rc;
3600}
3601
3602/*
3603 *   Individual callers to ioctl worker function follow
3604 */
3605
3606int
3607SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
3608		     u64 persistent_fid, u64 volatile_fid)
3609{
3610	int rc;
3611	struct  compress_ioctl fsctl_input;
3612	char *ret_data = NULL;
3613
3614	fsctl_input.CompressionState =
3615			cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
3616
3617	rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
3618			FSCTL_SET_COMPRESSION,
3619			(char *)&fsctl_input /* data input */,
3620			2 /* in data len */, CIFSMaxBufSize /* max out data */,
3621			&ret_data /* out data */, NULL);
3622
3623	cifs_dbg(FYI, "set compression rc %d\n", rc);
3624
3625	return rc;
3626}
3627
3628int
3629SMB2_close_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3630		struct smb_rqst *rqst,
3631		u64 persistent_fid, u64 volatile_fid, bool query_attrs)
3632{
3633	struct smb2_close_req *req;
3634	struct kvec *iov = rqst->rq_iov;
3635	unsigned int total_len;
3636	int rc;
3637
3638	rc = smb2_plain_req_init(SMB2_CLOSE, tcon, server,
3639				 (void **) &req, &total_len);
3640	if (rc)
3641		return rc;
3642
3643	req->PersistentFileId = persistent_fid;
3644	req->VolatileFileId = volatile_fid;
3645	if (query_attrs)
3646		req->Flags = SMB2_CLOSE_FLAG_POSTQUERY_ATTRIB;
3647	else
3648		req->Flags = 0;
3649	iov[0].iov_base = (char *)req;
3650	iov[0].iov_len = total_len;
3651
3652	return 0;
3653}
3654
3655void
3656SMB2_close_free(struct smb_rqst *rqst)
3657{
3658	if (rqst && rqst->rq_iov)
3659		cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3660}
3661
3662int
3663__SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
3664	     u64 persistent_fid, u64 volatile_fid,
3665	     struct smb2_file_network_open_info *pbuf)
3666{
3667	struct smb_rqst rqst;
3668	struct smb2_close_rsp *rsp = NULL;
3669	struct cifs_ses *ses = tcon->ses;
3670	struct TCP_Server_Info *server;
3671	struct kvec iov[1];
3672	struct kvec rsp_iov;
3673	int resp_buftype = CIFS_NO_BUFFER;
3674	int rc = 0;
3675	int flags = 0;
3676	bool query_attrs = false;
3677	int retries = 0, cur_sleep = 1;
3678
3679replay_again:
3680	/* reinitialize for possible replay */
3681	flags = 0;
3682	query_attrs = false;
3683	server = cifs_pick_channel(ses);
3684
3685	cifs_dbg(FYI, "Close\n");
3686
3687	if (!ses || !server)
3688		return smb_EIO(smb_eio_trace_null_pointers);
3689
3690	if (smb3_encryption_required(tcon))
3691		flags |= CIFS_TRANSFORM_REQ;
3692
3693	memset(&rqst, 0, sizeof(struct smb_rqst));
3694	memset(&iov, 0, sizeof(iov));
3695	rqst.rq_iov = iov;
3696	rqst.rq_nvec = 1;
3697
3698	/* check if need to ask server to return timestamps in close response */
3699	if (pbuf)
3700		query_attrs = true;
3701
3702	trace_smb3_close_enter(xid, persistent_fid, tcon->tid, ses->Suid);
3703	rc = SMB2_close_init(tcon, server,
3704			     &rqst, persistent_fid, volatile_fid,
3705			     query_attrs);
3706	if (rc)
3707		goto close_exit;
3708
3709	if (retries)
3710		smb2_set_replay(server, &rqst);
3711
3712	rc = cifs_send_recv(xid, ses, server,
3713			    &rqst, &resp_buftype, flags, &rsp_iov);
3714	rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
3715
3716	if (rc != 0) {
3717		cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
3718		trace_smb3_close_err(xid, persistent_fid, tcon->tid, ses->Suid,
3719				     rc);
3720		goto close_exit;
3721	} else {
3722		trace_smb3_close_done(xid, persistent_fid, tcon->tid,
3723				      ses->Suid);
3724		if (pbuf)
3725			memcpy(&pbuf->network_open_info,
3726			       &rsp->network_open_info,
3727			       sizeof(pbuf->network_open_info));
3728		atomic_dec(&tcon->num_remote_opens);
3729	}
3730
3731close_exit:
3732	SMB2_close_free(&rqst);
3733	free_rsp_buf(resp_buftype, rsp);
3734
3735	/* retry close in a worker thread if this one is interrupted */
3736	if (is_interrupt_error(rc)) {
3737		int tmp_rc;
3738
3739		tmp_rc = smb2_handle_cancelled_close(tcon, persistent_fid,
3740						     volatile_fid);
3741		if (tmp_rc)
3742			cifs_dbg(VFS, "handle cancelled close fid 0x%llx returned error %d\n",
3743				 persistent_fid, tmp_rc);
3744	}
3745
3746	if (is_replayable_error(rc) &&
3747	    smb2_should_replay(tcon, &retries, &cur_sleep))
3748		goto replay_again;
3749
3750	return rc;
3751}
3752
3753int
3754SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
3755		u64 persistent_fid, u64 volatile_fid)
3756{
3757	return __SMB2_close(xid, tcon, persistent_fid, volatile_fid, NULL);
3758}
3759
3760int
3761smb2_validate_iov(unsigned int offset, unsigned int buffer_length,
3762		  struct kvec *iov, unsigned int min_buf_size)
3763{
3764	unsigned int smb_len = iov->iov_len;
3765	char *end_of_smb = smb_len + (char *)iov->iov_base;
3766	char *begin_of_buf = offset + (char *)iov->iov_base;
3767	char *end_of_buf = begin_of_buf + buffer_length;
3768
3769
3770	if (buffer_length < min_buf_size) {
3771		cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
3772			 buffer_length, min_buf_size);
3773		return -EINVAL;
3774	}
3775
3776	/* check if beyond RFC1001 maximum length */
3777	if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
3778		cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
3779			 buffer_length, smb_len);
3780		return -EINVAL;
3781	}
3782
3783	if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
3784		cifs_dbg(VFS, "Invalid server response, bad offset to data\n");
3785		return -EINVAL;
3786	}
3787
3788	return 0;
3789}
3790
3791/*
3792 * If SMB buffer fields are valid, copy into temporary buffer to hold result.
3793 * Caller must free buffer.
3794 */
3795int
3796smb2_validate_and_copy_iov(unsigned int offset, unsigned int buffer_length,
3797			   struct kvec *iov, unsigned int minbufsize,
3798			   char *data)
3799{
3800	char *begin_of_buf = offset + (char *)iov->iov_base;
3801	int rc;
3802
3803	if (!data)
3804		return -EINVAL;
3805
3806	rc = smb2_validate_iov(offset, buffer_length, iov, minbufsize);
3807	if (rc)
3808		return rc;
3809
3810	memcpy(data, begin_of_buf, minbufsize);
3811
3812	return 0;
3813}
3814
3815int
3816SMB2_query_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3817		     struct smb_rqst *rqst,
3818		     u64 persistent_fid, u64 volatile_fid,
3819		     u8 info_class, u8 info_type, u32 additional_info,
3820		     size_t output_len, size_t input_len, void *input)
3821{
3822	struct smb2_query_info_req *req;
3823	struct kvec *iov = rqst->rq_iov;
3824	unsigned int total_len;
3825	size_t len;
3826	int rc;
3827
3828	if (unlikely(check_add_overflow(input_len, sizeof(*req), &len) ||
3829		     len > CIFSMaxBufSize))
3830		return -EINVAL;
3831
3832	rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server,
3833				 (void **) &req, &total_len);
3834	if (rc)
3835		return rc;
3836
3837	req->InfoType = info_type;
3838	req->FileInfoClass = info_class;
3839	req->PersistentFileId = persistent_fid;
3840	req->VolatileFileId = volatile_fid;
3841	req->AdditionalInformation = cpu_to_le32(additional_info);
3842
3843	req->OutputBufferLength = cpu_to_le32(output_len);
3844	if (input_len) {
3845		req->InputBufferLength = cpu_to_le32(input_len);
3846		/* total_len for smb query request never close to le16 max */
3847		req->InputBufferOffset = cpu_to_le16(total_len - 1);
3848		memcpy(req->Buffer, input, input_len);
3849	}
3850
3851	iov[0].iov_base = (char *)req;
3852	/* 1 for Buffer */
3853	iov[0].iov_len = len;
3854	return 0;
3855}
3856
3857void
3858SMB2_query_info_free(struct smb_rqst *rqst)
3859{
3860	if (rqst && rqst->rq_iov)
3861		cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
3862}
3863
3864static int
3865query_info(const unsigned int xid, struct cifs_tcon *tcon,
3866	   u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,
3867	   u32 additional_info, size_t output_len, size_t min_len, void **data,
3868		u32 *dlen)
3869{
3870	struct smb_rqst rqst;
3871	struct smb2_query_info_rsp *rsp = NULL;
3872	struct kvec iov[1];
3873	struct kvec rsp_iov;
3874	int rc = 0;
3875	int resp_buftype = CIFS_NO_BUFFER;
3876	struct cifs_ses *ses = tcon->ses;
3877	struct TCP_Server_Info *server;
3878	int flags = 0;
3879	bool allocated = false;
3880	int retries = 0, cur_sleep = 1;
3881
3882	cifs_dbg(FYI, "Query Info\n");
3883
3884	if (!ses)
3885		return smb_EIO(smb_eio_trace_null_pointers);
3886
3887replay_again:
3888	/* reinitialize for possible replay */
3889	flags = 0;
3890	allocated = false;
3891	server = cifs_pick_channel(ses);
3892
3893	if (!server)
3894		return smb_EIO(smb_eio_trace_null_pointers);
3895
3896	if (smb3_encryption_required(tcon))
3897		flags |= CIFS_TRANSFORM_REQ;
3898
3899	memset(&rqst, 0, sizeof(struct smb_rqst));
3900	memset(&iov, 0, sizeof(iov));
3901	rqst.rq_iov = iov;
3902	rqst.rq_nvec = 1;
3903
3904	rc = SMB2_query_info_init(tcon, server,
3905				  &rqst, persistent_fid, volatile_fid,
3906				  info_class, info_type, additional_info,
3907				  output_len, 0, NULL);
3908	if (rc)
3909		goto qinf_exit;
3910
3911	trace_smb3_query_info_enter(xid, persistent_fid, tcon->tid,
3912				    ses->Suid, info_class, (__u32)info_type);
3913
3914	if (retries)
3915		smb2_set_replay(server, &rqst);
3916
3917	rc = cifs_send_recv(xid, ses, server,
3918			    &rqst, &resp_buftype, flags, &rsp_iov);
3919	rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3920
3921	if (rc) {
3922		cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3923		trace_smb3_query_info_err(xid, persistent_fid, tcon->tid,
3924				ses->Suid, info_class, (__u32)info_type, rc);
3925		goto qinf_exit;
3926	}
3927
3928	trace_smb3_query_info_done(xid, persistent_fid, tcon->tid,
3929				ses->Suid, info_class, (__u32)info_type);
3930
3931	if (dlen) {
3932		*dlen = le32_to_cpu(rsp->OutputBufferLength);
3933		if (!*data) {
3934			*data = kmalloc(*dlen, GFP_KERNEL);
3935			if (!*data) {
3936				cifs_tcon_dbg(VFS,
3937					"Error %d allocating memory for acl\n",
3938					rc);
3939				*dlen = 0;
3940				rc = -ENOMEM;
3941				goto qinf_exit;
3942			}
3943			allocated = true;
3944		}
3945	}
3946
3947	rc = smb2_validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset),
3948					le32_to_cpu(rsp->OutputBufferLength),
3949					&rsp_iov, dlen ? *dlen : min_len, *data);
3950	if (rc && allocated) {
3951		kfree(*data);
3952		*data = NULL;
3953		*dlen = 0;
3954	}
3955
3956qinf_exit:
3957	SMB2_query_info_free(&rqst);
3958	free_rsp_buf(resp_buftype, rsp);
3959
3960	if (is_replayable_error(rc) &&
3961	    smb2_should_replay(tcon, &retries, &cur_sleep))
3962		goto replay_again;
3963
3964	return rc;
3965}
3966
3967int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
3968	u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
3969{
3970	return query_info(xid, tcon, persistent_fid, volatile_fid,
3971			  FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,
3972			  sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
3973			  sizeof(struct smb2_file_all_info), (void **)&data,
3974			  NULL);
3975}
3976
3977#if 0
3978/* currently unused, as now we are doing compounding instead (see smb311_posix_query_path_info) */
3979int
3980SMB311_posix_query_info(const unsigned int xid, struct cifs_tcon *tcon,
3981			u64 persistent_fid, u64 volatile_fid,
3982			struct smb311_posix_qinfo *data, u32 *plen)
3983{
3984	size_t output_len = sizeof(struct smb311_posix_qinfo) +
3985			(sizeof(struct smb_sid) * 2) + (PATH_MAX * 2);
3986	*plen = 0;
3987
3988	return query_info(xid, tcon, persistent_fid, volatile_fid,
3989			  SMB_FIND_FILE_POSIX_INFO, SMB2_O_INFO_FILE, 0,
3990			  output_len, sizeof(struct smb311_posix_qinfo), (void **)&data, plen);
3991	/* Note caller must free "data" (passed in above). It may be allocated in query_info call */
3992}
3993#endif
3994
3995int
3996SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
3997	       u64 persistent_fid, u64 volatile_fid,
3998	       void **data, u32 *plen, u32 extra_info)
3999{
4000	*plen = 0;
4001
4002	return query_info(xid, tcon, persistent_fid, volatile_fid,
4003			  0, SMB2_O_INFO_SECURITY, extra_info,
4004			  SMB2_MAX_BUFFER_SIZE, MIN_SEC_DESC_LEN, data, plen);
4005}
4006
4007int
4008SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
4009		 u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
4010{
4011	return query_info(xid, tcon, persistent_fid, volatile_fid,
4012			  FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
4013			  sizeof(struct smb2_file_internal_info),
4014			  sizeof(struct smb2_file_internal_info),
4015			  (void **)&uniqueid, NULL);
4016}
4017
4018/*
4019 * CHANGE_NOTIFY Request is sent to get notifications on changes to a directory
4020 * See MS-SMB2 2.2.35 and 2.2.36
4021 */
4022
4023static int
4024SMB2_notify_init(const unsigned int xid, struct smb_rqst *rqst,
4025		 struct cifs_tcon *tcon, struct TCP_Server_Info *server,
4026		 u64 persistent_fid, u64 volatile_fid,
4027		 u32 completion_filter, bool watch_tree)
4028{
4029	struct smb2_change_notify_req *req;
4030	struct kvec *iov = rqst->rq_iov;
4031	unsigned int total_len;
4032	int rc;
4033
4034	rc = smb2_plain_req_init(SMB2_CHANGE_NOTIFY, tcon, server,
4035				 (void **) &req, &total_len);
4036	if (rc)
4037		return rc;
4038
4039	req->PersistentFileId = persistent_fid;
4040	req->VolatileFileId = volatile_fid;
4041	/* See note 354 of MS-SMB2, 64K max */
4042	req->OutputBufferLength =
4043		cpu_to_le32(SMB2_MAX_BUFFER_SIZE - MAX_SMB2_HDR_SIZE);
4044	req->CompletionFilter = cpu_to_le32(completion_filter);
4045	if (watch_tree)
4046		req->Flags = cpu_to_le16(SMB2_WATCH_TREE);
4047	else
4048		req->Flags = 0;
4049
4050	iov[0].iov_base = (char *)req;
4051	iov[0].iov_len = total_len;
4052
4053	return 0;
4054}
4055
4056int
4057SMB2_change_notify(const unsigned int xid, struct cifs_tcon *tcon,
4058		u64 persistent_fid, u64 volatile_fid, bool watch_tree,
4059		u32 completion_filter, u32 max_out_data_len, char **out_data,
4060		u32 *plen /* returned data len */)
4061{
4062	struct cifs_ses *ses = tcon->ses;
4063	struct TCP_Server_Info *server;
4064	struct smb_rqst rqst;
4065	struct smb2_change_notify_rsp *smb_rsp;
4066	struct kvec iov[1];
4067	struct kvec rsp_iov = {NULL, 0};
4068	int resp_buftype = CIFS_NO_BUFFER;
4069	int flags = 0;
4070	int rc = 0;
4071	int retries = 0, cur_sleep = 1;
4072
4073replay_again:
4074	/* reinitialize for possible replay */
4075	flags = 0;
4076	server = cifs_pick_channel(ses);
4077
4078	cifs_dbg(FYI, "change notify\n");
4079	if (!ses || !server)
4080		return smb_EIO(smb_eio_trace_null_pointers);
4081
4082	if (smb3_encryption_required(tcon))
4083		flags |= CIFS_TRANSFORM_REQ;
4084
4085	memset(&rqst, 0, sizeof(struct smb_rqst));
4086	memset(&iov, 0, sizeof(iov));
4087	if (plen)
4088		*plen = 0;
4089
4090	rqst.rq_iov = iov;
4091	rqst.rq_nvec = 1;
4092
4093	rc = SMB2_notify_init(xid, &rqst, tcon, server,
4094			      persistent_fid, volatile_fid,
4095			      completion_filter, watch_tree);
4096	if (rc)
4097		goto cnotify_exit;
4098
4099	trace_smb3_notify_enter(xid, persistent_fid, tcon->tid, ses->Suid,
4100				(u8)watch_tree, completion_filter);
4101
4102	if (retries)
4103		smb2_set_replay(server, &rqst);
4104
4105	rc = cifs_send_recv(xid, ses, server,
4106			    &rqst, &resp_buftype, flags, &rsp_iov);
4107
4108	if (rc != 0) {
4109		cifs_stats_fail_inc(tcon, SMB2_CHANGE_NOTIFY_HE);
4110		trace_smb3_notify_err(xid, persistent_fid, tcon->tid, ses->Suid,
4111				(u8)watch_tree, completion_filter, rc);
4112	} else {
4113		trace_smb3_notify_done(xid, persistent_fid, tcon->tid,
4114			ses->Suid, (u8)watch_tree, completion_filter);
4115		/* validate that notify information is plausible */
4116		if ((rsp_iov.iov_base == NULL) ||
4117		    (rsp_iov.iov_len < sizeof(struct smb2_change_notify_rsp) + 1))
4118			goto cnotify_exit;
4119
4120		smb_rsp = (struct smb2_change_notify_rsp *)rsp_iov.iov_base;
4121
4122		rc = smb2_validate_iov(le16_to_cpu(smb_rsp->OutputBufferOffset),
4123				le32_to_cpu(smb_rsp->OutputBufferLength),
4124				&rsp_iov,
4125				sizeof(struct file_notify_information));
4126		if (rc)
4127			goto cnotify_exit;
4128
4129		*out_data = kmemdup((char *)smb_rsp + le16_to_cpu(smb_rsp->OutputBufferOffset),
4130				le32_to_cpu(smb_rsp->OutputBufferLength), GFP_KERNEL);
4131		if (*out_data == NULL) {
4132			rc = -ENOMEM;
4133			goto cnotify_exit;
4134		} else if (plen)
4135			*plen = le32_to_cpu(smb_rsp->OutputBufferLength);
4136	}
4137
4138 cnotify_exit:
4139	if (rqst.rq_iov)
4140		cifs_small_buf_release(rqst.rq_iov[0].iov_base); /* request */
4141	free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4142
4143	if (is_replayable_error(rc) &&
4144	    smb2_should_replay(tcon, &retries, &cur_sleep))
4145		goto replay_again;
4146
4147	return rc;
4148}
4149
4150
4151
4152/*
4153 * This is a no-op for now. We're not really interested in the reply, but
4154 * rather in the fact that the server sent one and that server->lstrp
4155 * gets updated.
4156 *
4157 * FIXME: maybe we should consider checking that the reply matches request?
4158 */
4159static void
4160smb2_echo_callback(struct TCP_Server_Info *server, struct mid_q_entry *mid)
4161{
4162	struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
4163	struct cifs_credits credits = { .value = 0, .instance = 0 };
4164
4165	if (mid->mid_state == MID_RESPONSE_RECEIVED
4166	    || mid->mid_state == MID_RESPONSE_MALFORMED) {
4167		credits.value = le16_to_cpu(rsp->hdr.CreditRequest);
4168		credits.instance = server->reconnect_instance;
4169	}
4170
4171	release_mid(server, mid);
4172	add_credits(server, &credits, CIFS_ECHO_OP);
4173}
4174
4175static void cifs_renegotiate_iosize(struct TCP_Server_Info *server,
4176				    struct cifs_tcon *tcon)
4177{
4178	struct cifs_sb_info *cifs_sb;
4179
4180	if (server == NULL || tcon == NULL)
4181		return;
4182
4183	spin_lock(&tcon->sb_list_lock);
4184	list_for_each_entry(cifs_sb, &tcon->cifs_sb_list, tcon_sb_link)
4185		cifs_negotiate_iosize(server, cifs_sb->ctx, tcon);
4186	spin_unlock(&tcon->sb_list_lock);
4187}
4188
4189void smb2_reconnect_server(struct work_struct *work)
4190{
4191	struct TCP_Server_Info *server = container_of(work,
4192					struct TCP_Server_Info, reconnect.work);
4193	struct TCP_Server_Info *pserver;
4194	struct cifs_ses *ses, *ses2;
4195	struct cifs_tcon *tcon, *tcon2;
4196	struct list_head tmp_list, tmp_ses_list;
4197	bool ses_exist = false;
4198	bool tcon_selected = false;
4199	int rc;
4200	bool resched = false;
4201
4202	/* first check if ref count has reached 0, if not inc ref count */
4203	spin_lock(&cifs_tcp_ses_lock);
4204	if (!server->srv_count) {
4205		spin_unlock(&cifs_tcp_ses_lock);
4206		return;
4207	}
4208	server->srv_count++;
4209	spin_unlock(&cifs_tcp_ses_lock);
4210
4211	/* If server is a channel, select the primary channel */
4212	pserver = SERVER_IS_CHAN(server) ? server->primary_server : server;
4213
4214	/* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
4215	mutex_lock(&pserver->reconnect_mutex);
4216
4217	/* if the server is marked for termination, drop the ref count here */
4218	if (server->terminate) {
4219		cifs_put_tcp_session(server, true);
4220		mutex_unlock(&pserver->reconnect_mutex);
4221		return;
4222	}
4223
4224	INIT_LIST_HEAD(&tmp_list);
4225	INIT_LIST_HEAD(&tmp_ses_list);
4226	cifs_dbg(FYI, "Reconnecting tcons and channels\n");
4227
4228	spin_lock(&cifs_tcp_ses_lock);
4229	list_for_each_entry(ses, &pserver->smb_ses_list, smb_ses_list) {
4230		spin_lock(&ses->ses_lock);
4231		if (ses->ses_status == SES_EXITING) {
4232			spin_unlock(&ses->ses_lock);
4233			continue;
4234		}
4235		spin_unlock(&ses->ses_lock);
4236
4237		tcon_selected = false;
4238
4239		list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
4240			if (tcon->need_reconnect || tcon->need_reopen_files) {
4241				spin_lock(&tcon->tc_lock);
4242				tcon->tc_count++;
4243				spin_unlock(&tcon->tc_lock);
4244				trace_smb3_tcon_ref(tcon->debug_id, tcon->tc_count,
4245						    netfs_trace_tcon_ref_get_reconnect_server);
4246				list_add_tail(&tcon->rlist, &tmp_list);
4247				tcon_selected = true;
4248			}
4249		}
4250		/*
4251		 * IPC has the same lifetime as its session and uses its
4252		 * refcount.
4253		 */
4254		if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) {
4255			list_add_tail(&ses->tcon_ipc->rlist, &tmp_list);
4256			tcon_selected = true;
4257			cifs_smb_ses_inc_refcount(ses);
4258		}
4259		/*
4260		 * handle the case where channel needs to reconnect
4261		 * binding session, but tcon is healthy (some other channel
4262		 * is active)
4263		 */
4264		spin_lock(&ses->chan_lock);
4265		if (!tcon_selected && cifs_chan_needs_reconnect(ses, server)) {
4266			list_add_tail(&ses->rlist, &tmp_ses_list);
4267			ses_exist = true;
4268			cifs_smb_ses_inc_refcount(ses);
4269		}
4270		spin_unlock(&ses->chan_lock);
4271	}
4272	spin_unlock(&cifs_tcp_ses_lock);
4273
4274	list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
4275		rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon, server, true);
4276		if (!rc) {
4277			cifs_renegotiate_iosize(server, tcon);
4278			cifs_reopen_persistent_handles(tcon);
4279		} else
4280			resched = true;
4281		list_del_init(&tcon->rlist);
4282		if (tcon->ipc)
4283			cifs_put_smb_ses(tcon->ses);
4284		else
4285			cifs_put_tcon(tcon, netfs_trace_tcon_ref_put_reconnect_server);
4286	}
4287
4288	if (!ses_exist)
4289		goto done;
4290
4291	/* allocate a dummy tcon struct used for reconnect */
4292	tcon = tcon_info_alloc(false, netfs_trace_tcon_ref_new_reconnect_server);
4293	if (!tcon) {
4294		resched = true;
4295		list_for_each_entry_safe(ses, ses2, &tmp_ses_list, rlist) {
4296			list_del_init(&ses->rlist);
4297			cifs_put_smb_ses(ses);
4298		}
4299		goto done;
4300	}
4301	tcon->status = TID_GOOD;
4302	tcon->dummy = true;
4303
4304	/* now reconnect sessions for necessary channels */
4305	list_for_each_entry_safe(ses, ses2, &tmp_ses_list, rlist) {
4306		tcon->ses = ses;
4307		rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon, server, true);
4308		if (rc)
4309			resched = true;
4310		list_del_init(&ses->rlist);
4311		cifs_put_smb_ses(ses);
4312	}
4313	tconInfoFree(tcon, netfs_trace_tcon_ref_free_reconnect_server);
4314
4315done:
4316	cifs_dbg(FYI, "Reconnecting tcons and channels finished\n");
4317	if (resched)
4318		cifs_requeue_server_reconn(server);
4319	mutex_unlock(&pserver->reconnect_mutex);
4320
4321	/* now we can safely release srv struct */
4322	cifs_put_tcp_session(server, true);
4323}
4324
4325int
4326SMB2_echo(struct TCP_Server_Info *server)
4327{
4328	struct smb2_echo_req *req;
4329	int rc = 0;
4330	struct kvec iov[1];
4331	struct smb_rqst rqst = { .rq_iov = iov,
4332				 .rq_nvec = 1 };
4333	unsigned int total_len;
4334
4335	cifs_dbg(FYI, "In echo request for conn_id %lld\n", server->conn_id);
4336
4337	spin_lock(&server->srv_lock);
4338	if (server->ops->need_neg &&
4339	    server->ops->need_neg(server)) {
4340		spin_unlock(&server->srv_lock);
4341		/* No need to send echo on newly established connections */
4342		cifs_queue_server_reconn(server);
4343		return rc;
4344	}
4345	spin_unlock(&server->srv_lock);
4346
4347	rc = smb2_plain_req_init(SMB2_ECHO, NULL, server,
4348				 (void **)&req, &total_len);
4349	if (rc)
4350		return rc;
4351
4352	req->hdr.CreditRequest = cpu_to_le16(1);
4353
4354	iov[0].iov_len = total_len;
4355	iov[0].iov_base = (char *)req;
4356
4357	rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
4358			     server, CIFS_ECHO_OP, NULL);
4359	if (rc)
4360		cifs_dbg(FYI, "Echo request failed: %d\n", rc);
4361
4362	cifs_small_buf_release(req);
4363	return rc;
4364}
4365
4366void
4367SMB2_flush_free(struct smb_rqst *rqst)
4368{
4369	if (rqst && rqst->rq_iov)
4370		cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
4371}
4372
4373int
4374SMB2_flush_init(const unsigned int xid, struct smb_rqst *rqst,
4375		struct cifs_tcon *tcon, struct TCP_Server_Info *server,
4376		u64 persistent_fid, u64 volatile_fid)
4377{
4378	struct smb2_flush_req *req;
4379	struct kvec *iov = rqst->rq_iov;
4380	unsigned int total_len;
4381	int rc;
4382
4383	rc = smb2_plain_req_init(SMB2_FLUSH, tcon, server,
4384				 (void **) &req, &total_len);
4385	if (rc)
4386		return rc;
4387
4388	req->PersistentFileId = persistent_fid;
4389	req->VolatileFileId = volatile_fid;
4390
4391	iov[0].iov_base = (char *)req;
4392	iov[0].iov_len = total_len;
4393
4394	return 0;
4395}
4396
4397int
4398SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
4399	   u64 volatile_fid)
4400{
4401	struct cifs_ses *ses = tcon->ses;
4402	struct smb_rqst rqst;
4403	struct kvec iov[1];
4404	struct kvec rsp_iov = {NULL, 0};
4405	struct TCP_Server_Info *server;
4406	int resp_buftype = CIFS_NO_BUFFER;
4407	int flags = 0;
4408	int rc = 0;
4409	int retries = 0, cur_sleep = 1;
4410
4411replay_again:
4412	/* reinitialize for possible replay */
4413	flags = 0;
4414	server = cifs_pick_channel(ses);
4415
4416	cifs_dbg(FYI, "flush\n");
4417	if (!ses || !(ses->server))
4418		return smb_EIO(smb_eio_trace_null_pointers);
4419
4420	if (smb3_encryption_required(tcon))
4421		flags |= CIFS_TRANSFORM_REQ;
4422
4423	memset(&rqst, 0, sizeof(struct smb_rqst));
4424	memset(&iov, 0, sizeof(iov));
4425	rqst.rq_iov = iov;
4426	rqst.rq_nvec = 1;
4427
4428	rc = SMB2_flush_init(xid, &rqst, tcon, server,
4429			     persistent_fid, volatile_fid);
4430	if (rc)
4431		goto flush_exit;
4432
4433	trace_smb3_flush_enter(xid, persistent_fid, tcon->tid, ses->Suid);
4434
4435	if (retries)
4436		smb2_set_replay(server, &rqst);
4437
4438	rc = cifs_send_recv(xid, ses, server,
4439			    &rqst, &resp_buftype, flags, &rsp_iov);
4440
4441	if (rc != 0) {
4442		cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
4443		trace_smb3_flush_err(xid, persistent_fid, tcon->tid, ses->Suid,
4444				     rc);
4445	} else
4446		trace_smb3_flush_done(xid, persistent_fid, tcon->tid,
4447				      ses->Suid);
4448
4449 flush_exit:
4450	SMB2_flush_free(&rqst);
4451	free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4452
4453	if (is_replayable_error(rc) &&
4454	    smb2_should_replay(tcon, &retries, &cur_sleep))
4455		goto replay_again;
4456
4457	return rc;
4458}
4459
4460#ifdef CONFIG_CIFS_SMB_DIRECT
4461static inline bool smb3_use_rdma_offload(struct cifs_io_parms *io_parms)
4462{
4463	struct TCP_Server_Info *server = io_parms->server;
4464	struct cifs_tcon *tcon = io_parms->tcon;
4465
4466	/* we can only offload if we're connected */
4467	if (!server || !tcon)
4468		return false;
4469
4470	/* we can only offload on an rdma connection */
4471	if (!server->rdma || !server->smbd_conn)
4472		return false;
4473
4474	/* we don't support signed offload yet */
4475	if (server->sign)
4476		return false;
4477
4478	/* we don't support encrypted offload yet */
4479	if (smb3_encryption_required(tcon))
4480		return false;
4481
4482	/* offload also has its overhead, so only do it if desired */
4483	if (io_parms->length < server->rdma_readwrite_threshold)
4484		return false;
4485
4486	return true;
4487}
4488#endif /* CONFIG_CIFS_SMB_DIRECT */
4489
4490/*
4491 * To form a chain of read requests, any read requests after the first should
4492 * have the end_of_chain boolean set to true.
4493 */
4494static int
4495smb2_new_read_req(void **buf, unsigned int *total_len,
4496	struct cifs_io_parms *io_parms, struct cifs_io_subrequest *rdata,
4497	unsigned int remaining_bytes, int request_type)
4498{
4499	int rc = -EACCES;
4500	struct smb2_read_req *req = NULL;
4501	struct smb2_hdr *shdr;
4502	struct TCP_Server_Info *server = io_parms->server;
4503
4504	rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, server,
4505				 (void **) &req, total_len);
4506	if (rc)
4507		return rc;
4508
4509	if (server == NULL)
4510		return -ECONNABORTED;
4511
4512	shdr = &req->hdr;
4513	shdr->Id.SyncId.ProcessId = cpu_to_le32(io_parms->pid);
4514
4515	req->PersistentFileId = io_parms->persistent_fid;
4516	req->VolatileFileId = io_parms->volatile_fid;
4517	req->ReadChannelInfoOffset = 0; /* reserved */
4518	req->ReadChannelInfoLength = 0; /* reserved */
4519	req->Channel = 0; /* reserved */
4520	req->MinimumCount = 0;
4521	req->Length = cpu_to_le32(io_parms->length);
4522	req->Offset = cpu_to_le64(io_parms->offset);
4523
4524	trace_smb3_read_enter(rdata ? rdata->rreq->debug_id : 0,
4525			      rdata ? rdata->subreq.debug_index : 0,
4526			      rdata ? rdata->xid : 0,
4527			      io_parms->persistent_fid,
4528			      io_parms->tcon->tid, io_parms->tcon->ses->Suid,
4529			      io_parms->offset, io_parms->length);
4530#ifdef CONFIG_CIFS_SMB_DIRECT
4531	/*
4532	 * If we want to do a RDMA write, fill in and append
4533	 * smbdirect_buffer_descriptor_v1 to the end of read request
4534	 */
4535	if (rdata && smb3_use_rdma_offload(io_parms)) {
4536		struct smbdirect_buffer_descriptor_v1 *v1;
4537		bool need_invalidate = server->dialect == SMB30_PROT_ID;
4538
4539		rdata->mr = smbd_register_mr(server->smbd_conn, &rdata->subreq.io_iter,
4540					     true, need_invalidate);
4541		if (!rdata->mr)
4542			return -EAGAIN;
4543
4544		req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
4545		if (need_invalidate)
4546			req->Channel = SMB2_CHANNEL_RDMA_V1;
4547		req->ReadChannelInfoOffset =
4548			cpu_to_le16(offsetof(struct smb2_read_req, Buffer));
4549		req->ReadChannelInfoLength =
4550			cpu_to_le16(sizeof(struct smbdirect_buffer_descriptor_v1));
4551		v1 = (struct smbdirect_buffer_descriptor_v1 *) &req->Buffer[0];
4552		v1->offset = cpu_to_le64(rdata->mr->mr->iova);
4553		v1->token = cpu_to_le32(rdata->mr->mr->rkey);
4554		v1->length = cpu_to_le32(rdata->mr->mr->length);
4555
4556		*total_len += sizeof(*v1) - 1;
4557	}
4558#endif
4559	if (request_type & CHAINED_REQUEST) {
4560		if (!(request_type & END_OF_CHAIN)) {
4561			/* next 8-byte aligned request */
4562			*total_len = ALIGN(*total_len, 8);
4563			shdr->NextCommand = cpu_to_le32(*total_len);
4564		} else /* END_OF_CHAIN */
4565			shdr->NextCommand = 0;
4566		if (request_type & RELATED_REQUEST) {
4567			shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
4568			/*
4569			 * Related requests use info from previous read request
4570			 * in chain.
4571			 */
4572			shdr->SessionId = cpu_to_le64(0xFFFFFFFFFFFFFFFF);
4573			shdr->Id.SyncId.TreeId = cpu_to_le32(0xFFFFFFFF);
4574			req->PersistentFileId = (u64)-1;
4575			req->VolatileFileId = (u64)-1;
4576		}
4577	}
4578	if (remaining_bytes > io_parms->length)
4579		req->RemainingBytes = cpu_to_le32(remaining_bytes);
4580	else
4581		req->RemainingBytes = 0;
4582
4583	*buf = req;
4584	return rc;
4585}
4586
4587static void
4588smb2_readv_callback(struct TCP_Server_Info *server, struct mid_q_entry *mid)
4589{
4590	struct cifs_io_subrequest *rdata = mid->callback_data;
4591	struct netfs_inode *ictx = netfs_inode(rdata->rreq->inode);
4592	struct cifs_tcon *tcon = tlink_tcon(rdata->req->cfile->tlink);
4593	struct smb2_hdr *shdr = (struct smb2_hdr *)rdata->iov[0].iov_base;
4594	struct cifs_credits credits = {
4595		.value = 0,
4596		.instance = 0,
4597		.rreq_debug_id = rdata->rreq->debug_id,
4598		.rreq_debug_index = rdata->subreq.debug_index,
4599	};
4600	struct smb_rqst rqst = { .rq_iov = &rdata->iov[0], .rq_nvec = 1 };
4601	unsigned int rreq_debug_id = rdata->rreq->debug_id;
4602	unsigned int subreq_debug_index = rdata->subreq.debug_index;
4603
4604	if (rdata->got_bytes) {
4605		rqst.rq_iter	  = rdata->subreq.io_iter;
4606	}
4607
4608	WARN_ONCE(rdata->server != server,
4609		  "rdata server %p != mid server %p",
4610		  rdata->server, server);
4611
4612	cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%zu/%zu\n",
4613		 __func__, mid->mid, mid->mid_state, rdata->result,
4614		 rdata->got_bytes, rdata->subreq.len - rdata->subreq.transferred);
4615
4616	switch (mid->mid_state) {
4617	case MID_RESPONSE_RECEIVED:
4618		credits.value = le16_to_cpu(shdr->CreditRequest);
4619		credits.instance = server->reconnect_instance;
4620		/* result already set, check signature */
4621		if (server->sign && !mid->decrypted) {
4622			int rc;
4623
4624			iov_iter_truncate(&rqst.rq_iter, rdata->got_bytes);
4625			rc = smb2_verify_signature(&rqst, server);
4626			if (rc)
4627				cifs_tcon_dbg(VFS, "SMB signature verification returned error = %d\n",
4628					 rc);
4629		}
4630		/* FIXME: should this be counted toward the initiating task? */
4631		task_io_account_read(rdata->got_bytes);
4632		cifs_stats_bytes_read(tcon, rdata->got_bytes);
4633		break;
4634	case MID_REQUEST_SUBMITTED:
4635		trace_netfs_sreq(&rdata->subreq, netfs_sreq_trace_io_req_submitted);
4636		goto do_retry;
4637	case MID_RETRY_NEEDED:
4638		trace_netfs_sreq(&rdata->subreq, netfs_sreq_trace_io_retry_needed);
4639do_retry:
4640		__set_bit(NETFS_SREQ_NEED_RETRY, &rdata->subreq.flags);
4641		rdata->result = -EAGAIN;
4642		if (server->sign && rdata->got_bytes)
4643			/* reset bytes number since we can not check a sign */
4644			rdata->got_bytes = 0;
4645		/* FIXME: should this be counted toward the initiating task? */
4646		task_io_account_read(rdata->got_bytes);
4647		cifs_stats_bytes_read(tcon, rdata->got_bytes);
4648		break;
4649	case MID_RESPONSE_MALFORMED:
4650		trace_netfs_sreq(&rdata->subreq, netfs_sreq_trace_io_malformed);
4651		credits.value = le16_to_cpu(shdr->CreditRequest);
4652		credits.instance = server->reconnect_instance;
4653		rdata->result = smb_EIO(smb_eio_trace_read_rsp_malformed);
4654		break;
4655	default:
4656		trace_netfs_sreq(&rdata->subreq, netfs_sreq_trace_io_unknown);
4657		rdata->result = smb_EIO1(smb_eio_trace_read_mid_state_unknown,
4658					 mid->mid_state);
4659		break;
4660	}
4661#ifdef CONFIG_CIFS_SMB_DIRECT
4662	/*
4663	 * If this rdata has a memory registered, the MR can be freed
4664	 * MR needs to be freed as soon as I/O finishes to prevent deadlock
4665	 * because they have limited number and are used for future I/Os
4666	 */
4667	if (rdata->mr) {
4668		smbd_deregister_mr(rdata->mr);
4669		rdata->mr = NULL;
4670	}
4671#endif
4672	if (rdata->result && rdata->result != -ENODATA) {
4673		cifs_stats_fail_inc(tcon, SMB2_READ_HE);
4674		trace_smb3_read_err(rdata->rreq->debug_id,
4675				    rdata->subreq.debug_index,
4676				    rdata->xid,
4677				    rdata->req->cfile->fid.persistent_fid,
4678				    tcon->tid, tcon->ses->Suid,
4679				    rdata->subreq.start + rdata->subreq.transferred,
4680				    rdata->subreq.len   - rdata->subreq.transferred,
4681				    rdata->result);
4682	} else
4683		trace_smb3_read_done(rdata->rreq->debug_id,
4684				     rdata->subreq.debug_index,
4685				     rdata->xid,
4686				     rdata->req->cfile->fid.persistent_fid,
4687				     tcon->tid, tcon->ses->Suid,
4688				     rdata->subreq.start + rdata->subreq.transferred,
4689				     rdata->got_bytes);
4690
4691	if (rdata->result == -ENODATA) {
4692		__set_bit(NETFS_SREQ_HIT_EOF, &rdata->subreq.flags);
4693		rdata->result = 0;
4694	} else {
4695		size_t trans = rdata->subreq.transferred + rdata->got_bytes;
4696		if (trans < rdata->subreq.len &&
4697		    rdata->subreq.start + trans >= ictx->remote_i_size) {
4698			__set_bit(NETFS_SREQ_HIT_EOF, &rdata->subreq.flags);
4699			rdata->result = 0;
4700		}
4701		if (rdata->got_bytes)
4702			__set_bit(NETFS_SREQ_MADE_PROGRESS, &rdata->subreq.flags);
4703	}
4704	trace_smb3_rw_credits(rreq_debug_id, subreq_debug_index, rdata->credits.value,
4705			      server->credits, server->in_flight,
4706			      0, cifs_trace_rw_credits_read_response_clear);
4707	rdata->credits.value = 0;
4708	rdata->subreq.error = rdata->result;
4709	rdata->subreq.transferred += rdata->got_bytes;
4710	trace_netfs_sreq(&rdata->subreq, netfs_sreq_trace_io_progress);
4711	netfs_read_subreq_terminated(&rdata->subreq);
4712	release_mid(server, mid);
4713	trace_smb3_rw_credits(rreq_debug_id, subreq_debug_index, 0,
4714			      server->credits, server->in_flight,
4715			      credits.value, cifs_trace_rw_credits_read_response_add);
4716	add_credits(server, &credits, 0);
4717}
4718
4719/* smb2_async_readv - send an async read, and set up mid to handle result */
4720int
4721smb2_async_readv(struct cifs_io_subrequest *rdata)
4722{
4723	int rc, flags = 0;
4724	char *buf;
4725	struct netfs_io_subrequest *subreq = &rdata->subreq;
4726	struct smb2_hdr *shdr;
4727	struct cifs_io_parms io_parms;
4728	struct smb_rqst rqst = { .rq_iov = rdata->iov,
4729				 .rq_nvec = 1 };
4730	struct TCP_Server_Info *server;
4731	struct cifs_tcon *tcon = tlink_tcon(rdata->req->cfile->tlink);
4732	unsigned int total_len;
4733	int credit_request;
4734
4735	cifs_dbg(FYI, "%s: offset=%llu bytes=%zu\n",
4736		 __func__, subreq->start, subreq->len);
4737
4738	if (!rdata->server)
4739		rdata->server = cifs_pick_channel(tcon->ses);
4740
4741	io_parms.tcon = tlink_tcon(rdata->req->cfile->tlink);
4742	io_parms.server = server = rdata->server;
4743	io_parms.offset = subreq->start + subreq->transferred;
4744	io_parms.length = subreq->len   - subreq->transferred;
4745	io_parms.persistent_fid = rdata->req->cfile->fid.persistent_fid;
4746	io_parms.volatile_fid = rdata->req->cfile->fid.volatile_fid;
4747	io_parms.pid = rdata->req->pid;
4748
4749	rc = smb2_new_read_req(
4750		(void **) &buf, &total_len, &io_parms, rdata, 0, 0);
4751	if (rc)
4752		return rc;
4753
4754	if (smb3_encryption_required(io_parms.tcon))
4755		flags |= CIFS_TRANSFORM_REQ;
4756
4757	rdata->iov[0].iov_base = buf;
4758	rdata->iov[0].iov_len = total_len;
4759	rdata->got_bytes = 0;
4760	rdata->result = 0;
4761
4762	shdr = (struct smb2_hdr *)buf;
4763
4764	if (rdata->credits.value > 0) {
4765		shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(io_parms.length,
4766						SMB2_MAX_BUFFER_SIZE));
4767		credit_request = le16_to_cpu(shdr->CreditCharge) + 8;
4768		if (server->credits >= server->max_credits)
4769			shdr->CreditRequest = cpu_to_le16(0);
4770		else
4771			shdr->CreditRequest = cpu_to_le16(
4772				min_t(int, server->max_credits -
4773						server->credits, credit_request));
4774
4775		rc = adjust_credits(server, rdata, cifs_trace_rw_credits_call_readv_adjust);
4776		if (rc)
4777			goto async_readv_out;
4778
4779		flags |= CIFS_HAS_CREDITS;
4780	}
4781
4782	rc = cifs_call_async(server, &rqst,
4783			     cifs_readv_receive, smb2_readv_callback,
4784			     smb3_handle_read_data, rdata, flags,
4785			     &rdata->credits);
4786	if (rc) {
4787		cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
4788		trace_smb3_read_err(rdata->rreq->debug_id,
4789				    subreq->debug_index,
4790				    rdata->xid, io_parms.persistent_fid,
4791				    io_parms.tcon->tid,
4792				    io_parms.tcon->ses->Suid,
4793				    io_parms.offset,
4794				    subreq->len - subreq->transferred, rc);
4795	}
4796
4797async_readv_out:
4798	cifs_small_buf_release(buf);
4799	return rc;
4800}
4801
4802int
4803SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
4804	  unsigned int *nbytes, char **buf, int *buf_type)
4805{
4806	struct smb_rqst rqst;
4807	int resp_buftype, rc;
4808	struct smb2_read_req *req = NULL;
4809	struct smb2_read_rsp *rsp = NULL;
4810	struct kvec iov[1];
4811	struct kvec rsp_iov;
4812	unsigned int total_len;
4813	int flags = CIFS_LOG_ERROR;
4814	struct cifs_ses *ses = io_parms->tcon->ses;
4815
4816	if (!io_parms->server)
4817		io_parms->server = cifs_pick_channel(io_parms->tcon->ses);
4818
4819	*nbytes = 0;
4820	rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0);
4821	if (rc)
4822		return rc;
4823
4824	if (smb3_encryption_required(io_parms->tcon))
4825		flags |= CIFS_TRANSFORM_REQ;
4826
4827	iov[0].iov_base = (char *)req;
4828	iov[0].iov_len = total_len;
4829
4830	memset(&rqst, 0, sizeof(struct smb_rqst));
4831	rqst.rq_iov = iov;
4832	rqst.rq_nvec = 1;
4833
4834	rc = cifs_send_recv(xid, ses, io_parms->server,
4835			    &rqst, &resp_buftype, flags, &rsp_iov);
4836	rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
4837
4838	if (rc) {
4839		if (rc != -ENODATA) {
4840			cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
4841			cifs_dbg(VFS, "Send error in read = %d\n", rc);
4842			trace_smb3_read_err(0, 0, xid,
4843					    req->PersistentFileId,
4844					    io_parms->tcon->tid, ses->Suid,
4845					    io_parms->offset, io_parms->length,
4846					    rc);
4847		} else
4848			trace_smb3_read_done(0, 0, xid,
4849					     req->PersistentFileId, io_parms->tcon->tid,
4850					     ses->Suid, io_parms->offset, 0);
4851		free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4852		cifs_small_buf_release(req);
4853		return rc == -ENODATA ? 0 : rc;
4854	} else
4855		trace_smb3_read_done(0, 0, xid,
4856				     req->PersistentFileId,
4857				     io_parms->tcon->tid, ses->Suid,
4858				     io_parms->offset, io_parms->length);
4859
4860	cifs_small_buf_release(req);
4861
4862	*nbytes = le32_to_cpu(rsp->DataLength);
4863	if ((*nbytes > CIFS_MAX_MSGSIZE) ||
4864	    (*nbytes > io_parms->length)) {
4865		cifs_dbg(FYI, "bad length %d for count %d\n",
4866			 *nbytes, io_parms->length);
4867		rc = smb_EIO2(smb_eio_trace_read_overlarge,
4868			      *nbytes, io_parms->length);
4869		*nbytes = 0;
4870	}
4871
4872	if (*buf) {
4873		memcpy(*buf, (char *)rsp + rsp->DataOffset, *nbytes);
4874		free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4875	} else if (resp_buftype != CIFS_NO_BUFFER) {
4876		*buf = rsp_iov.iov_base;
4877		if (resp_buftype == CIFS_SMALL_BUFFER)
4878			*buf_type = CIFS_SMALL_BUFFER;
4879		else if (resp_buftype == CIFS_LARGE_BUFFER)
4880			*buf_type = CIFS_LARGE_BUFFER;
4881	}
4882	return rc;
4883}
4884
4885/*
4886 * Check the mid_state and signature on received buffer (if any), and queue the
4887 * workqueue completion task.
4888 */
4889static void
4890smb2_writev_callback(struct TCP_Server_Info *server, struct mid_q_entry *mid)
4891{
4892	struct cifs_io_subrequest *wdata = mid->callback_data;
4893	struct cifs_tcon *tcon = tlink_tcon(wdata->req->cfile->tlink);
4894	struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
4895	struct cifs_credits credits = {
4896		.value = 0,
4897		.instance = 0,
4898		.rreq_debug_id = wdata->rreq->debug_id,
4899		.rreq_debug_index = wdata->subreq.debug_index,
4900	};
4901	unsigned int rreq_debug_id = wdata->rreq->debug_id;
4902	unsigned int subreq_debug_index = wdata->subreq.debug_index;
4903	ssize_t result = 0;
4904	size_t written;
4905
4906	WARN_ONCE(wdata->server != server,
4907		  "wdata server %p != mid server %p",
4908		  wdata->server, server);
4909
4910	switch (mid->mid_state) {
4911	case MID_RESPONSE_RECEIVED:
4912		trace_netfs_sreq(&wdata->subreq, netfs_sreq_trace_io_progress);
4913		credits.value = le16_to_cpu(rsp->hdr.CreditRequest);
4914		credits.instance = server->reconnect_instance;
4915		result = smb2_check_receive(mid, server, 0);
4916		if (result != 0) {
4917			trace_netfs_sreq(&wdata->subreq, netfs_sreq_trace_io_bad);
4918			break;
4919		}
4920
4921		written = le32_to_cpu(rsp->DataLength);
4922		/*
4923		 * Mask off high 16 bits when bytes written as returned
4924		 * by the server is greater than bytes requested by the
4925		 * client. OS/2 servers are known to set incorrect
4926		 * CountHigh values.
4927		 */
4928		if (written > wdata->subreq.len)
4929			written &= 0xFFFF;
4930
4931		cifs_stats_bytes_written(tcon, written);
4932
4933		if (written < wdata->subreq.len) {
4934			wdata->result = -ENOSPC;
4935		} else if (written > 0) {
4936			wdata->subreq.len = written;
4937			__set_bit(NETFS_SREQ_MADE_PROGRESS, &wdata->subreq.flags);
4938		}
4939		break;
4940	case MID_REQUEST_SUBMITTED:
4941		trace_netfs_sreq(&wdata->subreq, netfs_sreq_trace_io_req_submitted);
4942		__set_bit(NETFS_SREQ_NEED_RETRY, &wdata->subreq.flags);
4943		result = -EAGAIN;
4944		break;
4945	case MID_RETRY_NEEDED:
4946		trace_netfs_sreq(&wdata->subreq, netfs_sreq_trace_io_retry_needed);
4947		__set_bit(NETFS_SREQ_NEED_RETRY, &wdata->subreq.flags);
4948		result = -EAGAIN;
4949		break;
4950	case MID_RESPONSE_MALFORMED:
4951		trace_netfs_sreq(&wdata->subreq, netfs_sreq_trace_io_malformed);
4952		credits.value = le16_to_cpu(rsp->hdr.CreditRequest);
4953		credits.instance = server->reconnect_instance;
4954		result = smb_EIO(smb_eio_trace_write_rsp_malformed);
4955		break;
4956	default:
4957		trace_netfs_sreq(&wdata->subreq, netfs_sreq_trace_io_unknown);
4958		result = smb_EIO1(smb_eio_trace_write_mid_state_unknown,
4959				  mid->mid_state);
4960		break;
4961	}
4962#ifdef CONFIG_CIFS_SMB_DIRECT
4963	/*
4964	 * If this wdata has a memory registered, the MR can be freed
4965	 * The number of MRs available is limited, it's important to recover
4966	 * used MR as soon as I/O is finished. Hold MR longer in the later
4967	 * I/O process can possibly result in I/O deadlock due to lack of MR
4968	 * to send request on I/O retry
4969	 */
4970	if (wdata->mr) {
4971		smbd_deregister_mr(wdata->mr);
4972		wdata->mr = NULL;
4973	}
4974#endif
4975	if (result) {
4976		cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
4977		trace_smb3_write_err(wdata->rreq->debug_id,
4978				     wdata->subreq.debug_index,
4979				     wdata->xid,
4980				     wdata->req->cfile->fid.persistent_fid,
4981				     tcon->tid, tcon->ses->Suid, wdata->subreq.start,
4982				     wdata->subreq.len, wdata->result);
4983		if (wdata->result == -ENOSPC)
4984			pr_warn_once("Out of space writing to %s\n",
4985				     tcon->tree_name);
4986	} else
4987		trace_smb3_write_done(wdata->rreq->debug_id,
4988				      wdata->subreq.debug_index,
4989				      wdata->xid,
4990				      wdata->req->cfile->fid.persistent_fid,
4991				      tcon->tid, tcon->ses->Suid,
4992				      wdata->subreq.start, wdata->subreq.len);
4993
4994	trace_smb3_rw_credits(rreq_debug_id, subreq_debug_index, wdata->credits.value,
4995			      server->credits, server->in_flight,
4996			      0, cifs_trace_rw_credits_write_response_clear);
4997	wdata->credits.value = 0;
4998	cifs_write_subrequest_terminated(wdata, result ?: written);
4999	release_mid(server, mid);
5000	trace_smb3_rw_credits(rreq_debug_id, subreq_debug_index, 0,
5001			      server->credits, server->in_flight,
5002			      credits.value, cifs_trace_rw_credits_write_response_add);
5003	add_credits(server, &credits, 0);
5004}
5005
5006/* smb2_async_writev - send an async write, and set up mid to handle result */
5007void
5008smb2_async_writev(struct cifs_io_subrequest *wdata)
5009{
5010	int rc = -EACCES, flags = 0;
5011	struct smb2_write_req *req = NULL;
5012	struct smb2_hdr *shdr;
5013	struct cifs_tcon *tcon = tlink_tcon(wdata->req->cfile->tlink);
5014	struct TCP_Server_Info *server = wdata->server;
5015	struct kvec iov[1];
5016	struct smb_rqst rqst = { };
5017	unsigned int total_len, xid = wdata->xid;
5018	struct cifs_io_parms _io_parms;
5019	struct cifs_io_parms *io_parms = NULL;
5020	int credit_request;
5021
5022	/*
5023	 * in future we may get cifs_io_parms passed in from the caller,
5024	 * but for now we construct it here...
5025	 */
5026	_io_parms = (struct cifs_io_parms) {
5027		.tcon = tcon,
5028		.server = server,
5029		.offset = wdata->subreq.start,
5030		.length = wdata->subreq.len,
5031		.persistent_fid = wdata->req->cfile->fid.persistent_fid,
5032		.volatile_fid = wdata->req->cfile->fid.volatile_fid,
5033		.pid = wdata->req->pid,
5034	};
5035	io_parms = &_io_parms;
5036
5037	rc = smb2_plain_req_init(SMB2_WRITE, tcon, server,
5038				 (void **) &req, &total_len);
5039	if (rc)
5040		goto out;
5041
5042	rqst.rq_iov = iov;
5043	rqst.rq_iter = wdata->subreq.io_iter;
5044
5045	rqst.rq_iov[0].iov_len = total_len - 1;
5046	rqst.rq_iov[0].iov_base = (char *)req;
5047	rqst.rq_nvec += 1;
5048
5049	if (smb3_encryption_required(tcon))
5050		flags |= CIFS_TRANSFORM_REQ;
5051
5052	shdr = (struct smb2_hdr *)req;
5053	shdr->Id.SyncId.ProcessId = cpu_to_le32(io_parms->pid);
5054
5055	req->PersistentFileId = io_parms->persistent_fid;
5056	req->VolatileFileId = io_parms->volatile_fid;
5057	req->WriteChannelInfoOffset = 0;
5058	req->WriteChannelInfoLength = 0;
5059	req->Channel = SMB2_CHANNEL_NONE;
5060	req->Length = cpu_to_le32(io_parms->length);
5061	req->Offset = cpu_to_le64(io_parms->offset);
5062	req->DataOffset = cpu_to_le16(
5063				offsetof(struct smb2_write_req, Buffer));
5064	req->RemainingBytes = 0;
5065
5066	trace_smb3_write_enter(wdata->rreq->debug_id,
5067			       wdata->subreq.debug_index,
5068			       wdata->xid,
5069			       io_parms->persistent_fid,
5070			       io_parms->tcon->tid,
5071			       io_parms->tcon->ses->Suid,
5072			       io_parms->offset,
5073			       io_parms->length);
5074
5075#ifdef CONFIG_CIFS_SMB_DIRECT
5076	/*
5077	 * If we want to do a server RDMA read, fill in and append
5078	 * smbdirect_buffer_descriptor_v1 to the end of write request
5079	 */
5080	if (smb3_use_rdma_offload(io_parms)) {
5081		struct smbdirect_buffer_descriptor_v1 *v1;
5082		bool need_invalidate = server->dialect == SMB30_PROT_ID;
5083
5084		wdata->mr = smbd_register_mr(server->smbd_conn, &wdata->subreq.io_iter,
5085					     false, need_invalidate);
5086		if (!wdata->mr) {
5087			rc = -EAGAIN;
5088			goto async_writev_out;
5089		}
5090		/* For RDMA read, I/O size is in RemainingBytes not in Length */
5091		req->RemainingBytes = req->Length;
5092		req->Length = 0;
5093		req->DataOffset = 0;
5094		req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
5095		if (need_invalidate)
5096			req->Channel = SMB2_CHANNEL_RDMA_V1;
5097		req->WriteChannelInfoOffset =
5098			cpu_to_le16(offsetof(struct smb2_write_req, Buffer));
5099		req->WriteChannelInfoLength =
5100			cpu_to_le16(sizeof(struct smbdirect_buffer_descriptor_v1));
5101		v1 = (struct smbdirect_buffer_descriptor_v1 *) &req->Buffer[0];
5102		v1->offset = cpu_to_le64(wdata->mr->mr->iova);
5103		v1->token = cpu_to_le32(wdata->mr->mr->rkey);
5104		v1->length = cpu_to_le32(wdata->mr->mr->length);
5105
5106		rqst.rq_iov[0].iov_len += sizeof(*v1);
5107
5108		/*
5109		 * We keep wdata->subreq.io_iter,
5110		 * but we have to truncate rqst.rq_iter
5111		 */
5112		iov_iter_truncate(&rqst.rq_iter, 0);
5113	}
5114#endif
5115
5116	if (wdata->subreq.retry_count > 0)
5117		smb2_set_replay(server, &rqst);
5118
5119	cifs_dbg(FYI, "async write at %llu %u bytes iter=%zx\n",
5120		 io_parms->offset, io_parms->length, iov_iter_count(&wdata->subreq.io_iter));
5121
5122	if (wdata->credits.value > 0) {
5123		shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->subreq.len,
5124						    SMB2_MAX_BUFFER_SIZE));
5125		credit_request = le16_to_cpu(shdr->CreditCharge) + 8;
5126		if (server->credits >= server->max_credits)
5127			shdr->CreditRequest = cpu_to_le16(0);
5128		else
5129			shdr->CreditRequest = cpu_to_le16(
5130				min_t(int, server->max_credits -
5131						server->credits, credit_request));
5132
5133		rc = adjust_credits(server, wdata, cifs_trace_rw_credits_call_writev_adjust);
5134		if (rc)
5135			goto async_writev_out;
5136
5137		flags |= CIFS_HAS_CREDITS;
5138	}
5139
5140	/* XXX: compression + encryption is unsupported for now */
5141	if (((flags & CIFS_TRANSFORM_REQ) != CIFS_TRANSFORM_REQ) && should_compress(tcon, &rqst))
5142		flags |= CIFS_COMPRESS_REQ;
5143
5144	rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
5145			     wdata, flags, &wdata->credits);
5146	/* Can't touch wdata if rc == 0 */
5147	if (rc) {
5148		trace_smb3_write_err(wdata->rreq->debug_id,
5149				     wdata->subreq.debug_index,
5150				     xid,
5151				     io_parms->persistent_fid,
5152				     io_parms->tcon->tid,
5153				     io_parms->tcon->ses->Suid,
5154				     io_parms->offset,
5155				     io_parms->length,
5156				     rc);
5157		cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
5158	}
5159
5160async_writev_out:
5161	cifs_small_buf_release(req);
5162out:
5163	if (rc) {
5164		trace_smb3_rw_credits(wdata->rreq->debug_id,
5165				      wdata->subreq.debug_index,
5166				      wdata->credits.value,
5167				      server->credits, server->in_flight,
5168				      -(int)wdata->credits.value,
5169				      cifs_trace_rw_credits_write_response_clear);
5170		add_credits_and_wake_if(wdata->server, &wdata->credits, 0);
5171		cifs_write_subrequest_terminated(wdata, rc);
5172	}
5173}
5174
5175/*
5176 * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
5177 * The length field from io_parms must be at least 1 and indicates a number of
5178 * elements with data to write that begins with position 1 in iov array. All
5179 * data length is specified by count.
5180 */
5181int
5182SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
5183	   unsigned int *nbytes, struct kvec *iov, int n_vec)
5184{
5185	struct smb_rqst rqst;
5186	int rc = 0;
5187	struct smb2_write_req *req = NULL;
5188	struct smb2_write_rsp *rsp = NULL;
5189	int resp_buftype;
5190	struct kvec rsp_iov;
5191	int flags = 0;
5192	unsigned int total_len;
5193	struct TCP_Server_Info *server;
5194	int retries = 0, cur_sleep = 1;
5195
5196replay_again:
5197	/* reinitialize for possible replay */
5198	flags = 0;
5199	*nbytes = 0;
5200	if (!io_parms->server)
5201		io_parms->server = cifs_pick_channel(io_parms->tcon->ses);
5202	server = io_parms->server;
5203	if (server == NULL)
5204		return -ECONNABORTED;
5205
5206	if (n_vec < 1)
5207		return rc;
5208
5209	rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, server,
5210				 (void **) &req, &total_len);
5211	if (rc)
5212		return rc;
5213
5214	if (smb3_encryption_required(io_parms->tcon))
5215		flags |= CIFS_TRANSFORM_REQ;
5216
5217	req->hdr.Id.SyncId.ProcessId = cpu_to_le32(io_parms->pid);
5218
5219	req->PersistentFileId = io_parms->persistent_fid;
5220	req->VolatileFileId = io_parms->volatile_fid;
5221	req->WriteChannelInfoOffset = 0;
5222	req->WriteChannelInfoLength = 0;
5223	req->Channel = 0;
5224	req->Length = cpu_to_le32(io_parms->length);
5225	req->Offset = cpu_to_le64(io_parms->offset);
5226	req->DataOffset = cpu_to_le16(
5227				offsetof(struct smb2_write_req, Buffer));
5228	req->RemainingBytes = 0;
5229
5230	trace_smb3_write_enter(0, 0, xid, io_parms->persistent_fid,
5231		io_parms->tcon->tid, io_parms->tcon->ses->Suid,
5232		io_parms->offset, io_parms->length);
5233
5234	iov[0].iov_base = (char *)req;
5235	/* 1 for Buffer */
5236	iov[0].iov_len = total_len - 1;
5237
5238	memset(&rqst, 0, sizeof(struct smb_rqst));
5239	rqst.rq_iov = iov;
5240	/* iov[0] is the SMB header; move payload to rq_iter for encryption safety */
5241	rqst.rq_nvec = 1;
5242	iov_iter_kvec(&rqst.rq_iter, ITER_SOURCE, &iov[1], n_vec,
5243		      io_parms->length);
5244
5245	if (retries)
5246		smb2_set_replay(server, &rqst);
5247
5248	rc = cifs_send_recv(xid, io_parms->tcon->ses, server,
5249			    &rqst,
5250			    &resp_buftype, flags, &rsp_iov);
5251	rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
5252
5253	if (rc) {
5254		trace_smb3_write_err(0, 0, xid,
5255				     req->PersistentFileId,
5256				     io_parms->tcon->tid,
5257				     io_parms->tcon->ses->Suid,
5258				     io_parms->offset, io_parms->length, rc);
5259		cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
5260		cifs_dbg(VFS, "Send error in write = %d\n", rc);
5261	} else {
5262		*nbytes = le32_to_cpu(rsp->DataLength);
5263		cifs_stats_bytes_written(io_parms->tcon, *nbytes);
5264		trace_smb3_write_done(0, 0, xid,
5265				      req->PersistentFileId,
5266				      io_parms->tcon->tid,
5267				      io_parms->tcon->ses->Suid,
5268				      io_parms->offset, *nbytes);
5269	}
5270
5271	cifs_small_buf_release(req);
5272	free_rsp_buf(resp_buftype, rsp);
5273
5274	if (is_replayable_error(rc) &&
5275	    smb2_should_replay(io_parms->tcon, &retries, &cur_sleep))
5276		goto replay_again;
5277
5278	return rc;
5279}
5280
5281int posix_info_sid_size(const void *beg, const void *end)
5282{
5283	size_t subauth;
5284	int total;
5285
5286	if (beg + 1 > end)
5287		return -1;
5288
5289	subauth = *(u8 *)(beg+1);
5290	if (subauth < 1 || subauth > 15)
5291		return -1;
5292
5293	total = 1 + 1 + 6 + 4*subauth;
5294	if (beg + total > end)
5295		return -1;
5296
5297	return total;
5298}
5299
5300int posix_info_parse(const void *beg, const void *end,
5301		     struct smb2_posix_info_parsed *out)
5302
5303{
5304	int total_len = 0;
5305	int owner_len, group_len;
5306	int name_len;
5307	const void *owner_sid;
5308	const void *group_sid;
5309	const void *name;
5310
5311	/* if no end bound given, assume payload to be correct */
5312	if (!end) {
5313		const struct smb2_posix_info *p = beg;
5314
5315		end = beg + le32_to_cpu(p->NextEntryOffset);
5316		/* last element will have a 0 offset, pick a sensible bound */
5317		if (end == beg)
5318			end += 0xFFFF;
5319	}
5320
5321	/* check base buf */
5322	if (beg + sizeof(struct smb2_posix_info) > end)
5323		return -1;
5324	total_len = sizeof(struct smb2_posix_info);
5325
5326	/* check owner sid */
5327	owner_sid = beg + total_len;
5328	owner_len = posix_info_sid_size(owner_sid, end);
5329	if (owner_len < 0)
5330		return -1;
5331	total_len += owner_len;
5332
5333	/* check group sid */
5334	group_sid = beg + total_len;
5335	group_len = posix_info_sid_size(group_sid, end);
5336	if (group_len < 0)
5337		return -1;
5338	total_len += group_len;
5339
5340	/* check name len */
5341	if (beg + total_len + 4 > end)
5342		return -1;
5343	name_len = le32_to_cpu(*(__le32 *)(beg + total_len));
5344	if (name_len < 1 || name_len > 0xFFFF)
5345		return -1;
5346	total_len += 4;
5347
5348	/* check name */
5349	name = beg + total_len;
5350	if (name + name_len > end)
5351		return -1;
5352	total_len += name_len;
5353
5354	if (out) {
5355		out->base = beg;
5356		out->size = total_len;
5357		out->name_len = name_len;
5358		out->name = name;
5359		memcpy(&out->owner, owner_sid, owner_len);
5360		memcpy(&out->group, group_sid, group_len);
5361	}
5362	return total_len;
5363}
5364
5365static int posix_info_extra_size(const void *beg, const void *end)
5366{
5367	int len = posix_info_parse(beg, end, NULL);
5368
5369	if (len < 0)
5370		return -1;
5371	return len - sizeof(struct smb2_posix_info);
5372}
5373
5374static unsigned int
5375num_entries(int infotype, char *bufstart, char *end_of_buf, char **lastentry,
5376	    size_t size)
5377{
5378	int len;
5379	unsigned int entrycount = 0;
5380	unsigned int next_offset = 0;
5381	char *entryptr;
5382	FILE_DIRECTORY_INFO *dir_info;
5383
5384	if (bufstart == NULL)
5385		return 0;
5386
5387	entryptr = bufstart;
5388
5389	while (1) {
5390		if (entryptr + next_offset < entryptr ||
5391		    entryptr + next_offset > end_of_buf ||
5392		    entryptr + next_offset + size > end_of_buf) {
5393			cifs_dbg(VFS, "malformed search entry would overflow\n");
5394			break;
5395		}
5396
5397		entryptr = entryptr + next_offset;
5398		dir_info = (FILE_DIRECTORY_INFO *)entryptr;
5399
5400		if (infotype == SMB_FIND_FILE_POSIX_INFO)
5401			len = posix_info_extra_size(entryptr, end_of_buf);
5402		else
5403			len = le32_to_cpu(dir_info->FileNameLength);
5404
5405		if (len < 0 ||
5406		    entryptr + len < entryptr ||
5407		    entryptr + len > end_of_buf ||
5408		    entryptr + len + size > end_of_buf) {
5409			cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
5410				 end_of_buf);
5411			break;
5412		}
5413
5414		*lastentry = entryptr;
5415		entrycount++;
5416
5417		next_offset = le32_to_cpu(dir_info->NextEntryOffset);
5418		if (!next_offset)
5419			break;
5420	}
5421
5422	return entrycount;
5423}
5424
5425/*
5426 * Readdir/FindFirst
5427 */
5428int SMB2_query_directory_init(const unsigned int xid,
5429			      struct cifs_tcon *tcon,
5430			      struct TCP_Server_Info *server,
5431			      struct smb_rqst *rqst,
5432			      u64 persistent_fid, u64 volatile_fid,
5433			      int index, int info_level)
5434{
5435	struct smb2_query_directory_req *req;
5436	unsigned char *bufptr;
5437	__le16 asteriks = cpu_to_le16('*');
5438	unsigned int output_size = CIFSMaxBufSize -
5439		MAX_SMB2_CREATE_RESPONSE_SIZE -
5440		MAX_SMB2_CLOSE_RESPONSE_SIZE;
5441	unsigned int total_len;
5442	struct kvec *iov = rqst->rq_iov;
5443	int len, rc;
5444
5445	rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, server,
5446				 (void **) &req, &total_len);
5447	if (rc)
5448		return rc;
5449
5450	switch (info_level) {
5451	case SMB_FIND_FILE_DIRECTORY_INFO:
5452		req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
5453		break;
5454	case SMB_FIND_FILE_ID_FULL_DIR_INFO:
5455		req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
5456		break;
5457	case SMB_FIND_FILE_POSIX_INFO:
5458		req->FileInformationClass = SMB_FIND_FILE_POSIX_INFO;
5459		break;
5460	case SMB_FIND_FILE_FULL_DIRECTORY_INFO:
5461		req->FileInformationClass = FILE_FULL_DIRECTORY_INFORMATION;
5462		break;
5463	default:
5464		cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
5465			info_level);
5466		return -EINVAL;
5467	}
5468
5469	req->FileIndex = cpu_to_le32(index);
5470	req->PersistentFileId = persistent_fid;
5471	req->VolatileFileId = volatile_fid;
5472
5473	len = 0x2;
5474	bufptr = req->Buffer;
5475	memcpy(bufptr, &asteriks, len);
5476
5477	req->FileNameOffset =
5478		cpu_to_le16(sizeof(struct smb2_query_directory_req));
5479	req->FileNameLength = cpu_to_le16(len);
5480	/*
5481	 * BB could be 30 bytes or so longer if we used SMB2 specific
5482	 * buffer lengths, but this is safe and close enough.
5483	 */
5484	output_size = min_t(unsigned int, output_size, server->maxBuf);
5485	output_size = min_t(unsigned int, output_size, 2 << 15);
5486	req->OutputBufferLength = cpu_to_le32(output_size);
5487
5488	iov[0].iov_base = (char *)req;
5489	/* 1 for Buffer */
5490	iov[0].iov_len = total_len - 1;
5491
5492	iov[1].iov_base = (char *)(req->Buffer);
5493	iov[1].iov_len = len;
5494
5495	trace_smb3_query_dir_enter(xid, persistent_fid, tcon->tid,
5496			tcon->ses->Suid, index, output_size);
5497
5498	return 0;
5499}
5500
5501void SMB2_query_directory_free(struct smb_rqst *rqst)
5502{
5503	if (rqst && rqst->rq_iov) {
5504		cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
5505	}
5506}
5507
5508int
5509smb2_parse_query_directory(struct cifs_tcon *tcon,
5510			   struct kvec *rsp_iov,
5511			   int resp_buftype,
5512			   struct cifs_search_info *srch_inf)
5513{
5514	struct smb2_query_directory_rsp *rsp;
5515	size_t info_buf_size;
5516	char *end_of_smb;
5517	int rc;
5518
5519	rsp = (struct smb2_query_directory_rsp *)rsp_iov->iov_base;
5520
5521	switch (srch_inf->info_level) {
5522	case SMB_FIND_FILE_DIRECTORY_INFO:
5523		info_buf_size = sizeof(FILE_DIRECTORY_INFO);
5524		break;
5525	case SMB_FIND_FILE_ID_FULL_DIR_INFO:
5526		info_buf_size = sizeof(FILE_ID_FULL_DIR_INFO);
5527		break;
5528	case SMB_FIND_FILE_POSIX_INFO:
5529		/* note that posix payload are variable size */
5530		info_buf_size = sizeof(struct smb2_posix_info);
5531		break;
5532	case SMB_FIND_FILE_FULL_DIRECTORY_INFO:
5533		info_buf_size = sizeof(FILE_FULL_DIRECTORY_INFO);
5534		break;
5535	default:
5536		cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
5537			 srch_inf->info_level);
5538		return -EINVAL;
5539	}
5540
5541	rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
5542			       le32_to_cpu(rsp->OutputBufferLength), rsp_iov,
5543			       info_buf_size);
5544	if (rc) {
5545		cifs_tcon_dbg(VFS, "bad info payload");
5546		return rc;
5547	}
5548
5549	srch_inf->unicode = true;
5550
5551	if (srch_inf->ntwrk_buf_start) {
5552		if (srch_inf->smallBuf)
5553			cifs_small_buf_release(srch_inf->ntwrk_buf_start);
5554		else
5555			cifs_buf_release(srch_inf->ntwrk_buf_start);
5556	}
5557	srch_inf->ntwrk_buf_start = (char *)rsp;
5558	srch_inf->srch_entries_start = srch_inf->last_entry =
5559		(char *)rsp + le16_to_cpu(rsp->OutputBufferOffset);
5560	end_of_smb = rsp_iov->iov_len + (char *)rsp;
5561
5562	srch_inf->entries_in_buffer = num_entries(
5563		srch_inf->info_level,
5564		srch_inf->srch_entries_start,
5565		end_of_smb,
5566		&srch_inf->last_entry,
5567		info_buf_size);
5568
5569	srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
5570	cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
5571		 srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
5572		 srch_inf->srch_entries_start, srch_inf->last_entry);
5573	if (resp_buftype == CIFS_LARGE_BUFFER)
5574		srch_inf->smallBuf = false;
5575	else if (resp_buftype == CIFS_SMALL_BUFFER)
5576		srch_inf->smallBuf = true;
5577	else
5578		cifs_tcon_dbg(VFS, "Invalid search buffer type\n");
5579
5580	return 0;
5581}
5582
5583int
5584SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
5585		     u64 persistent_fid, u64 volatile_fid, int index,
5586		     struct cifs_search_info *srch_inf)
5587{
5588	struct smb_rqst rqst;
5589	struct kvec iov[SMB2_QUERY_DIRECTORY_IOV_SIZE];
5590	struct smb2_query_directory_rsp *rsp = NULL;
5591	int resp_buftype = CIFS_NO_BUFFER;
5592	struct kvec rsp_iov;
5593	int rc = 0;
5594	struct cifs_ses *ses = tcon->ses;
5595	struct TCP_Server_Info *server;
5596	int flags = 0;
5597	int retries = 0, cur_sleep = 1;
5598
5599replay_again:
5600	/* reinitialize for possible replay */
5601	flags = 0;
5602	server = cifs_pick_channel(ses);
5603
5604	if (!ses || !(ses->server))
5605		return smb_EIO(smb_eio_trace_null_pointers);
5606
5607	if (smb3_encryption_required(tcon))
5608		flags |= CIFS_TRANSFORM_REQ;
5609
5610	memset(&rqst, 0, sizeof(struct smb_rqst));
5611	memset(&iov, 0, sizeof(iov));
5612	rqst.rq_iov = iov;
5613	rqst.rq_nvec = SMB2_QUERY_DIRECTORY_IOV_SIZE;
5614
5615	rc = SMB2_query_directory_init(xid, tcon, server,
5616				       &rqst, persistent_fid,
5617				       volatile_fid, index,
5618				       srch_inf->info_level);
5619	if (rc)
5620		goto qdir_exit;
5621
5622	if (retries)
5623		smb2_set_replay(server, &rqst);
5624
5625	rc = cifs_send_recv(xid, ses, server,
5626			    &rqst, &resp_buftype, flags, &rsp_iov);
5627	rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
5628
5629	if (rc) {
5630		if (rc == -ENODATA &&
5631		    rsp->hdr.Status == STATUS_NO_MORE_FILES) {
5632			trace_smb3_query_dir_done(xid, persistent_fid,
5633				tcon->tid, tcon->ses->Suid, index, 0);
5634			srch_inf->endOfSearch = true;
5635			rc = 0;
5636		} else {
5637			trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
5638				tcon->ses->Suid, index, 0, rc);
5639			cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
5640		}
5641		goto qdir_exit;
5642	}
5643
5644	rc = smb2_parse_query_directory(tcon, &rsp_iov,	resp_buftype,
5645					srch_inf);
5646	if (rc) {
5647		trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
5648			tcon->ses->Suid, index, 0, rc);
5649		goto qdir_exit;
5650	}
5651	resp_buftype = CIFS_NO_BUFFER;
5652
5653	trace_smb3_query_dir_done(xid, persistent_fid, tcon->tid,
5654			tcon->ses->Suid, index, srch_inf->entries_in_buffer);
5655
5656qdir_exit:
5657	SMB2_query_directory_free(&rqst);
5658	free_rsp_buf(resp_buftype, rsp);
5659
5660	if (is_replayable_error(rc) &&
5661	    smb2_should_replay(tcon, &retries, &cur_sleep))
5662		goto replay_again;
5663
5664	return rc;
5665}
5666
5667int
5668SMB2_set_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
5669		   struct smb_rqst *rqst,
5670		   u64 persistent_fid, u64 volatile_fid, u32 pid,
5671		   u8 info_class, u8 info_type, u32 additional_info,
5672		   void **data, unsigned int *size)
5673{
5674	struct smb2_set_info_req *req;
5675	struct kvec *iov = rqst->rq_iov;
5676	unsigned int i, total_len;
5677	int rc;
5678
5679	rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, server,
5680				 (void **) &req, &total_len);
5681	if (rc)
5682		return rc;
5683
5684	req->hdr.Id.SyncId.ProcessId = cpu_to_le32(pid);
5685	req->InfoType = info_type;
5686	req->FileInfoClass = info_class;
5687	req->PersistentFileId = persistent_fid;
5688	req->VolatileFileId = volatile_fid;
5689	req->AdditionalInformation = cpu_to_le32(additional_info);
5690
5691	req->BufferOffset = cpu_to_le16(sizeof(struct smb2_set_info_req));
5692	req->BufferLength = cpu_to_le32(*size);
5693
5694	memcpy(req->Buffer, *data, *size);
5695	total_len += *size;
5696
5697	iov[0].iov_base = (char *)req;
5698	/* 1 for Buffer */
5699	iov[0].iov_len = total_len - 1;
5700
5701	for (i = 1; i < rqst->rq_nvec; i++) {
5702		le32_add_cpu(&req->BufferLength, size[i]);
5703		iov[i].iov_base = (char *)data[i];
5704		iov[i].iov_len = size[i];
5705	}
5706
5707	return 0;
5708}
5709
5710void
5711SMB2_set_info_free(struct smb_rqst *rqst)
5712{
5713	if (rqst && rqst->rq_iov)
5714		cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
5715}
5716
5717static int
5718send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
5719	       u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
5720	       u8 info_type, u32 additional_info, unsigned int num,
5721		void **data, unsigned int *size)
5722{
5723	struct smb_rqst rqst;
5724	struct smb2_set_info_rsp *rsp = NULL;
5725	struct kvec *iov;
5726	struct kvec rsp_iov;
5727	int rc = 0;
5728	int resp_buftype;
5729	struct cifs_ses *ses = tcon->ses;
5730	struct TCP_Server_Info *server;
5731	int flags = 0;
5732	int retries = 0, cur_sleep = 1;
5733
5734replay_again:
5735	/* reinitialize for possible replay */
5736	flags = 0;
5737	server = cifs_pick_channel(ses);
5738
5739	if (!ses || !server)
5740		return smb_EIO(smb_eio_trace_null_pointers);
5741
5742	if (!num)
5743		return -EINVAL;
5744
5745	if (smb3_encryption_required(tcon))
5746		flags |= CIFS_TRANSFORM_REQ;
5747
5748	iov = kmalloc_array(num, sizeof(struct kvec), GFP_KERNEL);
5749	if (!iov)
5750		return -ENOMEM;
5751
5752	memset(&rqst, 0, sizeof(struct smb_rqst));
5753	rqst.rq_iov = iov;
5754	rqst.rq_nvec = num;
5755
5756	rc = SMB2_set_info_init(tcon, server,
5757				&rqst, persistent_fid, volatile_fid, pid,
5758				info_class, info_type, additional_info,
5759				data, size);
5760	if (rc) {
5761		kfree(iov);
5762		return rc;
5763	}
5764
5765	if (retries)
5766		smb2_set_replay(server, &rqst);
5767
5768	rc = cifs_send_recv(xid, ses, server,
5769			    &rqst, &resp_buftype, flags,
5770			    &rsp_iov);
5771	SMB2_set_info_free(&rqst);
5772	rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
5773
5774	if (rc != 0) {
5775		cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
5776		trace_smb3_set_info_err(xid, persistent_fid, tcon->tid,
5777				ses->Suid, info_class, (__u32)info_type, rc);
5778	}
5779
5780	free_rsp_buf(resp_buftype, rsp);
5781	kfree(iov);
5782
5783	if (is_replayable_error(rc) &&
5784	    smb2_should_replay(tcon, &retries, &cur_sleep))
5785		goto replay_again;
5786
5787	return rc;
5788}
5789
5790int
5791SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
5792	     u64 volatile_fid, u32 pid, loff_t new_eof)
5793{
5794	struct smb2_file_eof_info info;
5795	void *data;
5796	unsigned int size;
5797
5798	info.EndOfFile = cpu_to_le64(new_eof);
5799
5800	data = &info;
5801	size = sizeof(struct smb2_file_eof_info);
5802
5803	trace_smb3_set_eof(xid, persistent_fid, tcon->tid, tcon->ses->Suid, new_eof);
5804
5805	return send_set_info(xid, tcon, persistent_fid, volatile_fid,
5806			pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
5807			0, 1, &data, &size);
5808}
5809
5810int
5811SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,
5812		u64 persistent_fid, u64 volatile_fid,
5813		struct smb_ntsd *pnntsd, int pacllen, int aclflag)
5814{
5815	return send_set_info(xid, tcon, persistent_fid, volatile_fid,
5816			current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag,
5817			1, (void **)&pnntsd, &pacllen);
5818}
5819
5820int
5821SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
5822	    u64 persistent_fid, u64 volatile_fid,
5823	    struct smb2_file_full_ea_info *buf, int len)
5824{
5825	return send_set_info(xid, tcon, persistent_fid, volatile_fid,
5826		current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE,
5827		0, 1, (void **)&buf, &len);
5828}
5829
5830int
5831SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
5832		  const u64 persistent_fid, const u64 volatile_fid,
5833		  __u8 oplock_level)
5834{
5835	struct smb_rqst rqst;
5836	int rc;
5837	struct smb2_oplock_break *req = NULL;
5838	struct cifs_ses *ses = tcon->ses;
5839	struct TCP_Server_Info *server;
5840	int flags = CIFS_OBREAK_OP;
5841	unsigned int total_len;
5842	struct kvec iov[1];
5843	struct kvec rsp_iov;
5844	int resp_buf_type;
5845	int retries = 0, cur_sleep = 1;
5846
5847replay_again:
5848	/* reinitialize for possible replay */
5849	flags = CIFS_OBREAK_OP;
5850	server = cifs_pick_channel(ses);
5851
5852	cifs_dbg(FYI, "SMB2_oplock_break\n");
5853	rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server,
5854				 (void **) &req, &total_len);
5855	if (rc)
5856		return rc;
5857
5858	if (smb3_encryption_required(tcon))
5859		flags |= CIFS_TRANSFORM_REQ;
5860
5861	req->VolatileFid = volatile_fid;
5862	req->PersistentFid = persistent_fid;
5863	req->OplockLevel = oplock_level;
5864	req->hdr.CreditRequest = cpu_to_le16(1);
5865
5866	flags |= CIFS_NO_RSP_BUF;
5867
5868	iov[0].iov_base = (char *)req;
5869	iov[0].iov_len = total_len;
5870
5871	memset(&rqst, 0, sizeof(struct smb_rqst));
5872	rqst.rq_iov = iov;
5873	rqst.rq_nvec = 1;
5874
5875	if (retries)
5876		smb2_set_replay(server, &rqst);
5877
5878	rc = cifs_send_recv(xid, ses, server,
5879			    &rqst, &resp_buf_type, flags, &rsp_iov);
5880	cifs_small_buf_release(req);
5881	if (rc) {
5882		cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
5883		cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
5884	}
5885
5886	if (is_replayable_error(rc) &&
5887	    smb2_should_replay(tcon, &retries, &cur_sleep))
5888		goto replay_again;
5889
5890	return rc;
5891}
5892
5893void
5894smb2_copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
5895			     struct kstatfs *kst)
5896{
5897	kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
5898			  le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
5899	kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
5900	kst->f_bfree  = kst->f_bavail =
5901			le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
5902	return;
5903}
5904
5905static void
5906copy_posix_fs_info_to_kstatfs(FILE_SYSTEM_POSIX_INFO *response_data,
5907			struct kstatfs *kst)
5908{
5909	kst->f_bsize = le32_to_cpu(response_data->BlockSize);
5910	kst->f_blocks = le64_to_cpu(response_data->TotalBlocks);
5911	kst->f_bfree =  le64_to_cpu(response_data->BlocksAvail);
5912	if (response_data->UserBlocksAvail == cpu_to_le64(-1))
5913		kst->f_bavail = kst->f_bfree;
5914	else
5915		kst->f_bavail = le64_to_cpu(response_data->UserBlocksAvail);
5916	if (response_data->TotalFileNodes != cpu_to_le64(-1))
5917		kst->f_files = le64_to_cpu(response_data->TotalFileNodes);
5918	if (response_data->FreeFileNodes != cpu_to_le64(-1))
5919		kst->f_ffree = le64_to_cpu(response_data->FreeFileNodes);
5920
5921	return;
5922}
5923
5924static int
5925build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon,
5926		   struct TCP_Server_Info *server,
5927		   int level, int outbuf_len, u64 persistent_fid,
5928		   u64 volatile_fid)
5929{
5930	int rc;
5931	struct smb2_query_info_req *req;
5932	unsigned int total_len;
5933
5934	cifs_dbg(FYI, "Query FSInfo level %d\n", level);
5935
5936	if ((tcon->ses == NULL) || server == NULL)
5937		return smb_EIO(smb_eio_trace_null_pointers);
5938
5939	rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server,
5940				 (void **) &req, &total_len);
5941	if (rc)
5942		return rc;
5943
5944	req->InfoType = SMB2_O_INFO_FILESYSTEM;
5945	req->FileInfoClass = level;
5946	req->PersistentFileId = persistent_fid;
5947	req->VolatileFileId = volatile_fid;
5948	/* 1 for pad */
5949	req->InputBufferOffset =
5950			cpu_to_le16(sizeof(struct smb2_query_info_req));
5951	req->OutputBufferLength = cpu_to_le32(
5952		outbuf_len + sizeof(struct smb2_query_info_rsp));
5953
5954	iov->iov_base = (char *)req;
5955	iov->iov_len = total_len;
5956	return 0;
5957}
5958
5959static inline void free_qfs_info_req(struct kvec *iov)
5960{
5961	cifs_buf_release(iov->iov_base);
5962}
5963
5964int
5965SMB311_posix_qfs_info(const unsigned int xid, struct cifs_tcon *tcon,
5966	      u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
5967{
5968	struct smb_rqst rqst;
5969	struct smb2_query_info_rsp *rsp = NULL;
5970	struct kvec iov;
5971	struct kvec rsp_iov;
5972	int rc = 0;
5973	int resp_buftype;
5974	struct cifs_ses *ses = tcon->ses;
5975	struct TCP_Server_Info *server;
5976	FILE_SYSTEM_POSIX_INFO *info = NULL;
5977	int flags = 0;
5978	int retries = 0, cur_sleep = 1;
5979
5980replay_again:
5981	/* reinitialize for possible replay */
5982	flags = 0;
5983	server = cifs_pick_channel(ses);
5984
5985	rc = build_qfs_info_req(&iov, tcon, server,
5986				FS_POSIX_INFORMATION,
5987				sizeof(FILE_SYSTEM_POSIX_INFO),
5988				persistent_fid, volatile_fid);
5989	if (rc)
5990		return rc;
5991
5992	if (smb3_encryption_required(tcon))
5993		flags |= CIFS_TRANSFORM_REQ;
5994
5995	memset(&rqst, 0, sizeof(struct smb_rqst));
5996	rqst.rq_iov = &iov;
5997	rqst.rq_nvec = 1;
5998
5999	if (retries)
6000		smb2_set_replay(server, &rqst);
6001
6002	rc = cifs_send_recv(xid, ses, server,
6003			    &rqst, &resp_buftype, flags, &rsp_iov);
6004	free_qfs_info_req(&iov);
6005	if (rc) {
6006		cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
6007		goto posix_qfsinf_exit;
6008	}
6009	rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
6010
6011	info = (FILE_SYSTEM_POSIX_INFO *)(
6012		le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
6013	rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
6014			       le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
6015			       sizeof(FILE_SYSTEM_POSIX_INFO));
6016	if (!rc)
6017		copy_posix_fs_info_to_kstatfs(info, fsdata);
6018
6019posix_qfsinf_exit:
6020	free_rsp_buf(resp_buftype, rsp_iov.iov_base);
6021
6022	if (is_replayable_error(rc) &&
6023	    smb2_should_replay(tcon, &retries, &cur_sleep))
6024		goto replay_again;
6025
6026	return rc;
6027}
6028
6029int
6030SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
6031	      u64 persistent_fid, u64 volatile_fid, int level)
6032{
6033	struct smb_rqst rqst;
6034	struct smb2_query_info_rsp *rsp = NULL;
6035	struct kvec iov;
6036	struct kvec rsp_iov;
6037	int rc = 0;
6038	int resp_buftype, max_len, min_len;
6039	struct cifs_ses *ses = tcon->ses;
6040	struct TCP_Server_Info *server;
6041	unsigned int rsp_len, offset;
6042	int flags = 0;
6043	int retries = 0, cur_sleep = 1;
6044
6045replay_again:
6046	/* reinitialize for possible replay */
6047	flags = 0;
6048	server = cifs_pick_channel(ses);
6049
6050	if (level == FS_DEVICE_INFORMATION) {
6051		max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
6052		min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
6053	} else if (level == FS_ATTRIBUTE_INFORMATION) {
6054		max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO) + MAX_FS_NAME_LEN;
6055		min_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
6056	} else if (level == FS_SECTOR_SIZE_INFORMATION) {
6057		max_len = sizeof(struct smb3_fs_ss_info);
6058		min_len = sizeof(struct smb3_fs_ss_info);
6059	} else if (level == FS_VOLUME_INFORMATION) {
6060		max_len = sizeof(struct smb3_fs_vol_info) + MAX_VOL_LABEL_LEN;
6061		min_len = sizeof(struct smb3_fs_vol_info);
6062	} else {
6063		cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
6064		return -EINVAL;
6065	}
6066
6067	rc = build_qfs_info_req(&iov, tcon, server,
6068				level, max_len,
6069				persistent_fid, volatile_fid);
6070	if (rc)
6071		return rc;
6072
6073	if (smb3_encryption_required(tcon))
6074		flags |= CIFS_TRANSFORM_REQ;
6075
6076	memset(&rqst, 0, sizeof(struct smb_rqst));
6077	rqst.rq_iov = &iov;
6078	rqst.rq_nvec = 1;
6079
6080	if (retries)
6081		smb2_set_replay(server, &rqst);
6082
6083	rc = cifs_send_recv(xid, ses, server,
6084			    &rqst, &resp_buftype, flags, &rsp_iov);
6085	free_qfs_info_req(&iov);
6086	if (rc) {
6087		cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
6088		goto qfsattr_exit;
6089	}
6090	rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
6091
6092	rsp_len = le32_to_cpu(rsp->OutputBufferLength);
6093	offset = le16_to_cpu(rsp->OutputBufferOffset);
6094	rc = smb2_validate_iov(offset, rsp_len, &rsp_iov, min_len);
6095	if (rc)
6096		goto qfsattr_exit;
6097
6098	if (level == FS_ATTRIBUTE_INFORMATION)
6099		memcpy(&tcon->fsAttrInfo, offset
6100			+ (char *)rsp, min_t(unsigned int,
6101			rsp_len, min_len));
6102	else if (level == FS_DEVICE_INFORMATION)
6103		memcpy(&tcon->fsDevInfo, offset
6104			+ (char *)rsp, sizeof(FILE_SYSTEM_DEVICE_INFO));
6105	else if (level == FS_SECTOR_SIZE_INFORMATION) {
6106		struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
6107			(offset + (char *)rsp);
6108		tcon->ss_flags = le32_to_cpu(ss_info->Flags);
6109		tcon->perf_sector_size =
6110			le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
6111	} else if (level == FS_VOLUME_INFORMATION) {
6112		struct smb3_fs_vol_info *vol_info = (struct smb3_fs_vol_info *)
6113			(offset + (char *)rsp);
6114		tcon->vol_serial_number = vol_info->VolumeSerialNumber;
6115		tcon->vol_create_time = vol_info->VolumeCreationTime;
6116	}
6117
6118qfsattr_exit:
6119	free_rsp_buf(resp_buftype, rsp_iov.iov_base);
6120
6121	if (is_replayable_error(rc) &&
6122	    smb2_should_replay(tcon, &retries, &cur_sleep))
6123		goto replay_again;
6124
6125	return rc;
6126}
6127
6128int
6129smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
6130	   const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
6131	   const __u32 num_lock, struct smb2_lock_element *buf)
6132{
6133	struct smb_rqst rqst;
6134	int rc = 0;
6135	struct smb2_lock_req *req = NULL;
6136	struct kvec iov[2];
6137	struct kvec rsp_iov;
6138	int resp_buf_type;
6139	unsigned int count;
6140	int flags = CIFS_NO_RSP_BUF;
6141	unsigned int total_len;
6142	struct TCP_Server_Info *server;
6143	int retries = 0, cur_sleep = 1;
6144
6145replay_again:
6146	/* reinitialize for possible replay */
6147	flags = CIFS_NO_RSP_BUF;
6148	server = cifs_pick_channel(tcon->ses);
6149
6150	cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
6151
6152	rc = smb2_plain_req_init(SMB2_LOCK, tcon, server,
6153				 (void **) &req, &total_len);
6154	if (rc)
6155		return rc;
6156
6157	if (smb3_encryption_required(tcon))
6158		flags |= CIFS_TRANSFORM_REQ;
6159
6160	req->hdr.Id.SyncId.ProcessId = cpu_to_le32(pid);
6161	req->LockCount = cpu_to_le16(num_lock);
6162
6163	req->PersistentFileId = persist_fid;
6164	req->VolatileFileId = volatile_fid;
6165
6166	count = num_lock * sizeof(struct smb2_lock_element);
6167
6168	iov[0].iov_base = (char *)req;
6169	iov[0].iov_len = total_len - sizeof(struct smb2_lock_element);
6170	iov[1].iov_base = (char *)buf;
6171	iov[1].iov_len = count;
6172
6173	cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
6174
6175	memset(&rqst, 0, sizeof(struct smb_rqst));
6176	rqst.rq_iov = iov;
6177	rqst.rq_nvec = 2;
6178
6179	if (retries)
6180		smb2_set_replay(server, &rqst);
6181
6182	rc = cifs_send_recv(xid, tcon->ses, server,
6183			    &rqst, &resp_buf_type, flags,
6184			    &rsp_iov);
6185	cifs_small_buf_release(req);
6186	if (rc) {
6187		cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
6188		cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
6189		trace_smb3_lock_err(xid, persist_fid, tcon->tid,
6190				    tcon->ses->Suid, rc);
6191	}
6192
6193	if (is_replayable_error(rc) &&
6194	    smb2_should_replay(tcon, &retries, &cur_sleep))
6195		goto replay_again;
6196
6197	return rc;
6198}
6199
6200int
6201SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
6202	  const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
6203	  const __u64 length, const __u64 offset, const __u32 lock_flags,
6204	  const bool wait)
6205{
6206	struct smb2_lock_element lock;
6207
6208	lock.Offset = cpu_to_le64(offset);
6209	lock.Length = cpu_to_le64(length);
6210	lock.Flags = cpu_to_le32(lock_flags);
6211	if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
6212		lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
6213
6214	return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
6215}
6216
6217int
6218SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
6219		 __u8 *lease_key, const __le32 lease_state)
6220{
6221	struct smb_rqst rqst;
6222	int rc;
6223	struct smb2_lease_ack *req = NULL;
6224	struct cifs_ses *ses = tcon->ses;
6225	int flags = CIFS_OBREAK_OP;
6226	unsigned int total_len;
6227	struct kvec iov[1];
6228	struct kvec rsp_iov;
6229	int resp_buf_type;
6230	__u64 *please_key_high;
6231	__u64 *please_key_low;
6232	struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses);
6233
6234	cifs_dbg(FYI, "SMB2_lease_break\n");
6235	rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server,
6236				 (void **) &req, &total_len);
6237	if (rc)
6238		return rc;
6239
6240	if (smb3_encryption_required(tcon))
6241		flags |= CIFS_TRANSFORM_REQ;
6242
6243	req->hdr.CreditRequest = cpu_to_le16(1);
6244	req->StructureSize = cpu_to_le16(36);
6245	total_len += 12;
6246
6247	memcpy(req->LeaseKey, lease_key, SMB2_LEASE_KEY_SIZE);
6248	req->LeaseState = lease_state;
6249
6250	flags |= CIFS_NO_RSP_BUF;
6251
6252	iov[0].iov_base = (char *)req;
6253	iov[0].iov_len = total_len;
6254
6255	memset(&rqst, 0, sizeof(struct smb_rqst));
6256	rqst.rq_iov = iov;
6257	rqst.rq_nvec = 1;
6258
6259	rc = cifs_send_recv(xid, ses, server,
6260			    &rqst, &resp_buf_type, flags, &rsp_iov);
6261	cifs_small_buf_release(req);
6262
6263	please_key_low = (__u64 *)lease_key;
6264	please_key_high = (__u64 *)(lease_key+8);
6265	if (rc) {
6266		cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
6267		trace_smb3_lease_ack_err(le32_to_cpu(lease_state), tcon->tid,
6268			ses->Suid, *please_key_low, *please_key_high, rc);
6269		cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
6270	} else
6271		trace_smb3_lease_ack_done(le32_to_cpu(lease_state), tcon->tid,
6272			ses->Suid, *please_key_low, *please_key_high);
6273
6274	return rc;
6275}