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 "cifsglob.h"
  27#include "cifsacl.h"
  28#include "cifsproto.h"
  29#include "smb2proto.h"
  30#include "cifs_unicode.h"
  31#include "cifs_debug.h"
  32#include "ntlmssp.h"
  33#include "smb2status.h"
  34#include "smb2glob.h"
  35#include "cifspdu.h"
  36#include "cifs_spnego.h"
  37#include "smbdirect.h"
  38#include "trace.h"
  39#ifdef CONFIG_CIFS_DFS_UPCALL
  40#include "dfs_cache.h"
  41#endif
  42#include "cached_dir.h"
  43
  44/*
  45 *  The following table defines the expected "StructureSize" of SMB2 requests
  46 *  in order by SMB2 command.  This is similar to "wct" in SMB/CIFS requests.
  47 *
  48 *  Note that commands are defined in smb2pdu.h in le16 but the array below is
  49 *  indexed by command in host byte order.
  50 */
  51static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
  52	/* SMB2_NEGOTIATE */ 36,
  53	/* SMB2_SESSION_SETUP */ 25,
  54	/* SMB2_LOGOFF */ 4,
  55	/* SMB2_TREE_CONNECT */	9,
  56	/* SMB2_TREE_DISCONNECT */ 4,
  57	/* SMB2_CREATE */ 57,
  58	/* SMB2_CLOSE */ 24,
  59	/* SMB2_FLUSH */ 24,
  60	/* SMB2_READ */	49,
  61	/* SMB2_WRITE */ 49,
  62	/* SMB2_LOCK */	48,
  63	/* SMB2_IOCTL */ 57,
  64	/* SMB2_CANCEL */ 4,
  65	/* SMB2_ECHO */ 4,
  66	/* SMB2_QUERY_DIRECTORY */ 33,
  67	/* SMB2_CHANGE_NOTIFY */ 32,
  68	/* SMB2_QUERY_INFO */ 41,
  69	/* SMB2_SET_INFO */ 33,
  70	/* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
  71};
  72
  73int smb3_encryption_required(const struct cifs_tcon *tcon)
  74{
  75	if (!tcon || !tcon->ses)
  76		return 0;
  77	if ((tcon->ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) ||
  78	    (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA))
  79		return 1;
  80	if (tcon->seal &&
  81	    (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
  82		return 1;
  83	return 0;
  84}
  85
  86static void
  87smb2_hdr_assemble(struct smb2_hdr *shdr, __le16 smb2_cmd,
  88		  const struct cifs_tcon *tcon,
  89		  struct TCP_Server_Info *server)
  90{
  91	shdr->ProtocolId = SMB2_PROTO_NUMBER;
  92	shdr->StructureSize = cpu_to_le16(64);
  93	shdr->Command = smb2_cmd;
  94	if (server) {
  95		spin_lock(&server->req_lock);
  96		/* Request up to 10 credits but don't go over the limit. */
  97		if (server->credits >= server->max_credits)
  98			shdr->CreditRequest = cpu_to_le16(0);
  99		else
 100			shdr->CreditRequest = cpu_to_le16(
 101				min_t(int, server->max_credits -
 102						server->credits, 10));
 103		spin_unlock(&server->req_lock);
 104	} else {
 105		shdr->CreditRequest = cpu_to_le16(2);
 106	}
 107	shdr->Id.SyncId.ProcessId = cpu_to_le32((__u16)current->tgid);
 108
 109	if (!tcon)
 110		goto out;
 111
 112	/* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
 113	/* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
 114	if (server && (server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 115		shdr->CreditCharge = cpu_to_le16(1);
 116	/* else CreditCharge MBZ */
 117
 118	shdr->Id.SyncId.TreeId = cpu_to_le32(tcon->tid);
 119	/* Uid is not converted */
 120	if (tcon->ses)
 121		shdr->SessionId = cpu_to_le64(tcon->ses->Suid);
 122
 123	/*
 124	 * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
 125	 * to pass the path on the Open SMB prefixed by \\server\share.
 126	 * Not sure when we would need to do the augmented path (if ever) and
 127	 * setting this flag breaks the SMB2 open operation since it is
 128	 * illegal to send an empty path name (without \\server\share prefix)
 129	 * when the DFS flag is set in the SMB open header. We could
 130	 * consider setting the flag on all operations other than open
 131	 * but it is safer to net set it for now.
 132	 */
 133/*	if (tcon->share_flags & SHI1005_FLAGS_DFS)
 134		shdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
 135
 136	if (server && server->sign && !smb3_encryption_required(tcon))
 137		shdr->Flags |= SMB2_FLAGS_SIGNED;
 138out:
 139	return;
 140}
 141
 142static int
 143smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon,
 144	       struct TCP_Server_Info *server)
 145{
 146	int rc = 0;
 147	struct nls_table *nls_codepage;
 148	struct cifs_ses *ses;
 149	int retries;
 150
 151	/*
 152	 * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
 153	 * check for tcp and smb session status done differently
 154	 * for those three - in the calling routine.
 155	 */
 156	if (tcon == NULL)
 157		return 0;
 158
 159	/*
 160	 * Need to also skip SMB2_IOCTL because it is used for checking nested dfs links in
 161	 * cifs_tree_connect().
 162	 */
 163	if (smb2_command == SMB2_TREE_CONNECT || smb2_command == SMB2_IOCTL)
 164		return 0;
 165
 166	spin_lock(&tcon->tc_lock);
 167	if (tcon->status == TID_EXITING) {
 168		/*
 169		 * only tree disconnect, open, and write,
 170		 * (and ulogoff which does not have tcon)
 171		 * are allowed as we start force umount.
 172		 */
 173		if ((smb2_command != SMB2_WRITE) &&
 174		   (smb2_command != SMB2_CREATE) &&
 175		   (smb2_command != SMB2_TREE_DISCONNECT)) {
 176			spin_unlock(&tcon->tc_lock);
 177			cifs_dbg(FYI, "can not send cmd %d while umounting\n",
 178				 smb2_command);
 179			return -ENODEV;
 180		}
 181	}
 182	spin_unlock(&tcon->tc_lock);
 183	if ((!tcon->ses) || (tcon->ses->ses_status == SES_EXITING) ||
 184	    (!tcon->ses->server) || !server)
 185		return -EIO;
 186
 187	ses = tcon->ses;
 188	retries = server->nr_targets;
 189
 190	/*
 191	 * Give demultiplex thread up to 10 seconds to each target available for
 192	 * reconnect -- should be greater than cifs socket timeout which is 7
 193	 * seconds.
 194	 */
 195	while (server->tcpStatus == CifsNeedReconnect) {
 196		/*
 197		 * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
 198		 * here since they are implicitly done when session drops.
 199		 */
 200		switch (smb2_command) {
 201		/*
 202		 * BB Should we keep oplock break and add flush to exceptions?
 203		 */
 204		case SMB2_TREE_DISCONNECT:
 205		case SMB2_CANCEL:
 206		case SMB2_CLOSE:
 207		case SMB2_OPLOCK_BREAK:
 208			return -EAGAIN;
 209		}
 210
 211		rc = wait_event_interruptible_timeout(server->response_q,
 212						      (server->tcpStatus != CifsNeedReconnect),
 213						      10 * HZ);
 214		if (rc < 0) {
 215			cifs_dbg(FYI, "%s: aborting reconnect due to a received signal by the process\n",
 216				 __func__);
 217			return -ERESTARTSYS;
 218		}
 219
 220		/* are we still trying to reconnect? */
 221		spin_lock(&server->srv_lock);
 222		if (server->tcpStatus != CifsNeedReconnect) {
 223			spin_unlock(&server->srv_lock);
 224			break;
 225		}
 226		spin_unlock(&server->srv_lock);
 227
 228		if (retries && --retries)
 229			continue;
 230
 231		/*
 232		 * on "soft" mounts we wait once. Hard mounts keep
 233		 * retrying until process is killed or server comes
 234		 * back on-line
 235		 */
 236		if (!tcon->retry) {
 237			cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
 238			return -EHOSTDOWN;
 239		}
 240		retries = server->nr_targets;
 241	}
 242
 243	spin_lock(&ses->chan_lock);
 244	if (!cifs_chan_needs_reconnect(ses, server) && !tcon->need_reconnect) {
 245		spin_unlock(&ses->chan_lock);
 246		return 0;
 247	}
 248	spin_unlock(&ses->chan_lock);
 249	cifs_dbg(FYI, "sess reconnect mask: 0x%lx, tcon reconnect: %d",
 250		 tcon->ses->chans_need_reconnect,
 251		 tcon->need_reconnect);
 252
 253	nls_codepage = load_nls_default();
 254
 255	/*
 
 
 
 
 
 
 256	 * Recheck after acquire mutex. If another thread is negotiating
 257	 * and the server never sends an answer the socket will be closed
 258	 * and tcpStatus set to reconnect.
 259	 */
 260	spin_lock(&server->srv_lock);
 261	if (server->tcpStatus == CifsNeedReconnect) {
 262		spin_unlock(&server->srv_lock);
 263		rc = -EHOSTDOWN;
 
 264		goto out;
 265	}
 266	spin_unlock(&server->srv_lock);
 267
 268	/*
 269	 * need to prevent multiple threads trying to simultaneously
 270	 * reconnect the same SMB session
 271	 */
 272	spin_lock(&ses->chan_lock);
 273	if (!cifs_chan_needs_reconnect(ses, server)) {
 274		spin_unlock(&ses->chan_lock);
 275
 276		/* this means that we only need to tree connect */
 277		if (tcon->need_reconnect)
 278			goto skip_sess_setup;
 279
 280		goto out;
 281	}
 282	spin_unlock(&ses->chan_lock);
 283
 284	mutex_lock(&ses->session_mutex);
 285	rc = cifs_negotiate_protocol(0, ses, server);
 286	if (!rc) {
 287		rc = cifs_setup_session(0, ses, server, nls_codepage);
 288		if ((rc == -EACCES) && !tcon->retry) {
 289			mutex_unlock(&ses->session_mutex);
 290			rc = -EHOSTDOWN;
 
 
 
 291			goto failed;
 292		} else if (rc) {
 293			mutex_unlock(&ses->session_mutex);
 294			goto out;
 295		}
 296	} else {
 297		mutex_unlock(&ses->session_mutex);
 298		goto out;
 299	}
 300	mutex_unlock(&ses->session_mutex);
 
 
 
 
 301
 302skip_sess_setup:
 303	mutex_lock(&ses->session_mutex);
 304	if (!tcon->need_reconnect) {
 305		mutex_unlock(&ses->session_mutex);
 306		goto out;
 307	}
 
 308	cifs_mark_open_files_invalid(tcon);
 309	if (tcon->use_persistent)
 310		tcon->need_reopen_files = true;
 311
 312	rc = cifs_tree_connect(0, tcon, nls_codepage);
 313	mutex_unlock(&ses->session_mutex);
 314
 315	cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
 316	if (rc) {
 317		/* If sess reconnected but tcon didn't, something strange ... */
 318		pr_warn_once("reconnect tcon failed rc = %d\n", rc);
 319		goto out;
 320	}
 321
 322	if (smb2_command != SMB2_INTERNAL_CMD)
 323		mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
 324
 325	atomic_inc(&tconInfoReconnectCount);
 326out:
 327	/*
 328	 * Check if handle based operation so we know whether we can continue
 329	 * or not without returning to caller to reset file handle.
 330	 */
 331	/*
 332	 * BB Is flush done by server on drop of tcp session? Should we special
 333	 * case it and skip above?
 334	 */
 335	switch (smb2_command) {
 336	case SMB2_FLUSH:
 337	case SMB2_READ:
 338	case SMB2_WRITE:
 339	case SMB2_LOCK:
 340	case SMB2_IOCTL:
 341	case SMB2_QUERY_DIRECTORY:
 342	case SMB2_CHANGE_NOTIFY:
 343	case SMB2_QUERY_INFO:
 344	case SMB2_SET_INFO:
 345		rc = -EAGAIN;
 346	}
 347failed:
 348	unload_nls(nls_codepage);
 349	return rc;
 350}
 351
 352static void
 353fill_small_buf(__le16 smb2_command, struct cifs_tcon *tcon,
 354	       struct TCP_Server_Info *server,
 355	       void *buf,
 356	       unsigned int *total_len)
 357{
 358	struct smb2_pdu *spdu = buf;
 359	/* lookup word count ie StructureSize from table */
 360	__u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_command)];
 361
 362	/*
 363	 * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
 364	 * largest operations (Create)
 365	 */
 366	memset(buf, 0, 256);
 367
 368	smb2_hdr_assemble(&spdu->hdr, smb2_command, tcon, server);
 369	spdu->StructureSize2 = cpu_to_le16(parmsize);
 370
 371	*total_len = parmsize + sizeof(struct smb2_hdr);
 372}
 373
 374/*
 375 * Allocate and return pointer to an SMB request hdr, and set basic
 376 * SMB information in the SMB header. If the return code is zero, this
 377 * function must have filled in request_buf pointer.
 378 */
 379static int __smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
 380				 struct TCP_Server_Info *server,
 381				 void **request_buf, unsigned int *total_len)
 382{
 383	/* BB eventually switch this to SMB2 specific small buf size */
 384	if (smb2_command == SMB2_SET_INFO)
 385		*request_buf = cifs_buf_get();
 386	else
 387		*request_buf = cifs_small_buf_get();
 388	if (*request_buf == NULL) {
 389		/* BB should we add a retry in here if not a writepage? */
 390		return -ENOMEM;
 391	}
 392
 393	fill_small_buf(smb2_command, tcon, server,
 394		       (struct smb2_hdr *)(*request_buf),
 395		       total_len);
 396
 397	if (tcon != NULL) {
 398		uint16_t com_code = le16_to_cpu(smb2_command);
 399		cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
 400		cifs_stats_inc(&tcon->num_smbs_sent);
 401	}
 402
 403	return 0;
 404}
 405
 406static int smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
 407			       struct TCP_Server_Info *server,
 408			       void **request_buf, unsigned int *total_len)
 409{
 410	int rc;
 411
 412	rc = smb2_reconnect(smb2_command, tcon, server);
 413	if (rc)
 414		return rc;
 415
 416	return __smb2_plain_req_init(smb2_command, tcon, server, request_buf,
 417				     total_len);
 418}
 419
 420static int smb2_ioctl_req_init(u32 opcode, struct cifs_tcon *tcon,
 421			       struct TCP_Server_Info *server,
 422			       void **request_buf, unsigned int *total_len)
 423{
 424	/* Skip reconnect only for FSCTL_VALIDATE_NEGOTIATE_INFO IOCTLs */
 425	if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO) {
 426		return __smb2_plain_req_init(SMB2_IOCTL, tcon, server,
 427					     request_buf, total_len);
 428	}
 429	return smb2_plain_req_init(SMB2_IOCTL, tcon, server,
 430				   request_buf, total_len);
 431}
 432
 433/* For explanation of negotiate contexts see MS-SMB2 section 2.2.3.1 */
 434
 435static void
 436build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
 437{
 438	pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
 439	pneg_ctxt->DataLength = cpu_to_le16(38);
 440	pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
 441	pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE);
 442	get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE);
 443	pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
 444}
 445
 446static void
 447build_compression_ctxt(struct smb2_compression_capabilities_context *pneg_ctxt)
 448{
 449	pneg_ctxt->ContextType = SMB2_COMPRESSION_CAPABILITIES;
 450	pneg_ctxt->DataLength =
 451		cpu_to_le16(sizeof(struct smb2_compression_capabilities_context)
 452			  - sizeof(struct smb2_neg_context));
 453	pneg_ctxt->CompressionAlgorithmCount = cpu_to_le16(3);
 454	pneg_ctxt->CompressionAlgorithms[0] = SMB3_COMPRESS_LZ77;
 455	pneg_ctxt->CompressionAlgorithms[1] = SMB3_COMPRESS_LZ77_HUFF;
 456	pneg_ctxt->CompressionAlgorithms[2] = SMB3_COMPRESS_LZNT1;
 457}
 458
 459static unsigned int
 460build_signing_ctxt(struct smb2_signing_capabilities *pneg_ctxt)
 461{
 462	unsigned int ctxt_len = sizeof(struct smb2_signing_capabilities);
 463	unsigned short num_algs = 1; /* number of signing algorithms sent */
 464
 465	pneg_ctxt->ContextType = SMB2_SIGNING_CAPABILITIES;
 466	/*
 467	 * Context Data length must be rounded to multiple of 8 for some servers
 468	 */
 469	pneg_ctxt->DataLength = cpu_to_le16(ALIGN(sizeof(struct smb2_signing_capabilities) -
 470					    sizeof(struct smb2_neg_context) +
 471					    (num_algs * sizeof(u16)), 8));
 472	pneg_ctxt->SigningAlgorithmCount = cpu_to_le16(num_algs);
 473	pneg_ctxt->SigningAlgorithms[0] = cpu_to_le16(SIGNING_ALG_AES_CMAC);
 474
 475	ctxt_len += sizeof(__le16) * num_algs;
 476	ctxt_len = ALIGN(ctxt_len, 8);
 477	return ctxt_len;
 478	/* TBD add SIGNING_ALG_AES_GMAC and/or SIGNING_ALG_HMAC_SHA256 */
 479}
 480
 481static void
 482build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
 483{
 484	pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
 485	if (require_gcm_256) {
 486		pneg_ctxt->DataLength = cpu_to_le16(4); /* Cipher Count + 1 cipher */
 487		pneg_ctxt->CipherCount = cpu_to_le16(1);
 488		pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES256_GCM;
 489	} else if (enable_gcm_256) {
 490		pneg_ctxt->DataLength = cpu_to_le16(8); /* Cipher Count + 3 ciphers */
 491		pneg_ctxt->CipherCount = cpu_to_le16(3);
 492		pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
 493		pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES256_GCM;
 494		pneg_ctxt->Ciphers[2] = SMB2_ENCRYPTION_AES128_CCM;
 495	} else {
 496		pneg_ctxt->DataLength = cpu_to_le16(6); /* Cipher Count + 2 ciphers */
 497		pneg_ctxt->CipherCount = cpu_to_le16(2);
 498		pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
 499		pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES128_CCM;
 500	}
 501}
 502
 503static unsigned int
 504build_netname_ctxt(struct smb2_netname_neg_context *pneg_ctxt, char *hostname)
 505{
 506	struct nls_table *cp = load_nls_default();
 507
 508	pneg_ctxt->ContextType = SMB2_NETNAME_NEGOTIATE_CONTEXT_ID;
 509
 510	/* copy up to max of first 100 bytes of server name to NetName field */
 511	pneg_ctxt->DataLength = cpu_to_le16(2 * cifs_strtoUTF16(pneg_ctxt->NetName, hostname, 100, cp));
 512	/* context size is DataLength + minimal smb2_neg_context */
 513	return ALIGN(le16_to_cpu(pneg_ctxt->DataLength) + sizeof(struct smb2_neg_context), 8);
 
 514}
 515
 516static void
 517build_posix_ctxt(struct smb2_posix_neg_context *pneg_ctxt)
 518{
 519	pneg_ctxt->ContextType = SMB2_POSIX_EXTENSIONS_AVAILABLE;
 520	pneg_ctxt->DataLength = cpu_to_le16(POSIX_CTXT_DATA_LEN);
 521	/* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
 522	pneg_ctxt->Name[0] = 0x93;
 523	pneg_ctxt->Name[1] = 0xAD;
 524	pneg_ctxt->Name[2] = 0x25;
 525	pneg_ctxt->Name[3] = 0x50;
 526	pneg_ctxt->Name[4] = 0x9C;
 527	pneg_ctxt->Name[5] = 0xB4;
 528	pneg_ctxt->Name[6] = 0x11;
 529	pneg_ctxt->Name[7] = 0xE7;
 530	pneg_ctxt->Name[8] = 0xB4;
 531	pneg_ctxt->Name[9] = 0x23;
 532	pneg_ctxt->Name[10] = 0x83;
 533	pneg_ctxt->Name[11] = 0xDE;
 534	pneg_ctxt->Name[12] = 0x96;
 535	pneg_ctxt->Name[13] = 0x8B;
 536	pneg_ctxt->Name[14] = 0xCD;
 537	pneg_ctxt->Name[15] = 0x7C;
 538}
 539
 540static void
 541assemble_neg_contexts(struct smb2_negotiate_req *req,
 542		      struct TCP_Server_Info *server, unsigned int *total_len)
 543{
 544	unsigned int ctxt_len, neg_context_count;
 545	struct TCP_Server_Info *pserver;
 546	char *pneg_ctxt;
 547	char *hostname;
 548
 549	if (*total_len > 200) {
 550		/* In case length corrupted don't want to overrun smb buffer */
 551		cifs_server_dbg(VFS, "Bad frame length assembling neg contexts\n");
 552		return;
 553	}
 554
 555	/*
 556	 * round up total_len of fixed part of SMB3 negotiate request to 8
 557	 * byte boundary before adding negotiate contexts
 558	 */
 559	*total_len = ALIGN(*total_len, 8);
 560
 561	pneg_ctxt = (*total_len) + (char *)req;
 562	req->NegotiateContextOffset = cpu_to_le32(*total_len);
 563
 564	build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
 565	ctxt_len = ALIGN(sizeof(struct smb2_preauth_neg_context), 8);
 566	*total_len += ctxt_len;
 567	pneg_ctxt += ctxt_len;
 568
 569	build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
 570	ctxt_len = ALIGN(sizeof(struct smb2_encryption_neg_context), 8);
 571	*total_len += ctxt_len;
 572	pneg_ctxt += ctxt_len;
 573
 574	/*
 575	 * secondary channels don't have the hostname field populated
 576	 * use the hostname field in the primary channel instead
 577	 */
 578	pserver = CIFS_SERVER_IS_CHAN(server) ? server->primary_server : server;
 579	cifs_server_lock(pserver);
 580	hostname = pserver->hostname;
 581	if (hostname && (hostname[0] != 0)) {
 582		ctxt_len = build_netname_ctxt((struct smb2_netname_neg_context *)pneg_ctxt,
 583					      hostname);
 584		*total_len += ctxt_len;
 585		pneg_ctxt += ctxt_len;
 586		neg_context_count = 3;
 587	} else
 588		neg_context_count = 2;
 589	cifs_server_unlock(pserver);
 590
 591	build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt);
 592	*total_len += sizeof(struct smb2_posix_neg_context);
 593	pneg_ctxt += sizeof(struct smb2_posix_neg_context);
 594	neg_context_count++;
 595
 596	if (server->compress_algorithm) {
 597		build_compression_ctxt((struct smb2_compression_capabilities_context *)
 598				pneg_ctxt);
 599		ctxt_len = ALIGN(sizeof(struct smb2_compression_capabilities_context), 8);
 
 
 600		*total_len += ctxt_len;
 601		pneg_ctxt += ctxt_len;
 602		neg_context_count++;
 603	}
 604
 605	if (enable_negotiate_signing) {
 606		ctxt_len = build_signing_ctxt((struct smb2_signing_capabilities *)
 607				pneg_ctxt);
 608		*total_len += ctxt_len;
 609		pneg_ctxt += ctxt_len;
 610		neg_context_count++;
 611	}
 612
 613	/* check for and add transport_capabilities and signing capabilities */
 614	req->NegotiateContextCount = cpu_to_le16(neg_context_count);
 
 
 615
 
 
 616}
 617
 618static void decode_preauth_context(struct smb2_preauth_neg_context *ctxt)
 619{
 620	unsigned int len = le16_to_cpu(ctxt->DataLength);
 621
 622	/* If invalid preauth context warn but use what we requested, SHA-512 */
 623	if (len < MIN_PREAUTH_CTXT_DATA_LEN) {
 624		pr_warn_once("server sent bad preauth context\n");
 625		return;
 626	} else if (len < MIN_PREAUTH_CTXT_DATA_LEN + le16_to_cpu(ctxt->SaltLength)) {
 627		pr_warn_once("server sent invalid SaltLength\n");
 628		return;
 629	}
 630	if (le16_to_cpu(ctxt->HashAlgorithmCount) != 1)
 631		pr_warn_once("Invalid SMB3 hash algorithm count\n");
 632	if (ctxt->HashAlgorithms != SMB2_PREAUTH_INTEGRITY_SHA512)
 633		pr_warn_once("unknown SMB3 hash algorithm\n");
 634}
 635
 636static void decode_compress_ctx(struct TCP_Server_Info *server,
 637			 struct smb2_compression_capabilities_context *ctxt)
 638{
 639	unsigned int len = le16_to_cpu(ctxt->DataLength);
 640
 641	/* sizeof compress context is a one element compression capbility struct */
 642	if (len < 10) {
 643		pr_warn_once("server sent bad compression cntxt\n");
 644		return;
 645	}
 646	if (le16_to_cpu(ctxt->CompressionAlgorithmCount) != 1) {
 647		pr_warn_once("Invalid SMB3 compress algorithm count\n");
 648		return;
 649	}
 650	if (le16_to_cpu(ctxt->CompressionAlgorithms[0]) > 3) {
 651		pr_warn_once("unknown compression algorithm\n");
 652		return;
 653	}
 654	server->compress_algorithm = ctxt->CompressionAlgorithms[0];
 655}
 656
 657static int decode_encrypt_ctx(struct TCP_Server_Info *server,
 658			      struct smb2_encryption_neg_context *ctxt)
 659{
 660	unsigned int len = le16_to_cpu(ctxt->DataLength);
 661
 662	cifs_dbg(FYI, "decode SMB3.11 encryption neg context of len %d\n", len);
 663	if (len < MIN_ENCRYPT_CTXT_DATA_LEN) {
 664		pr_warn_once("server sent bad crypto ctxt len\n");
 665		return -EINVAL;
 666	}
 667
 668	if (le16_to_cpu(ctxt->CipherCount) != 1) {
 669		pr_warn_once("Invalid SMB3.11 cipher count\n");
 670		return -EINVAL;
 671	}
 672	cifs_dbg(FYI, "SMB311 cipher type:%d\n", le16_to_cpu(ctxt->Ciphers[0]));
 673	if (require_gcm_256) {
 674		if (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES256_GCM) {
 675			cifs_dbg(VFS, "Server does not support requested encryption type (AES256 GCM)\n");
 676			return -EOPNOTSUPP;
 677		}
 678	} else if (ctxt->Ciphers[0] == 0) {
 679		/*
 680		 * e.g. if server only supported AES256_CCM (very unlikely)
 681		 * or server supported no encryption types or had all disabled.
 682		 * Since GLOBAL_CAP_ENCRYPTION will be not set, in the case
 683		 * in which mount requested encryption ("seal") checks later
 684		 * on during tree connection will return proper rc, but if
 685		 * seal not requested by client, since server is allowed to
 686		 * return 0 to indicate no supported cipher, we can't fail here
 687		 */
 688		server->cipher_type = 0;
 689		server->capabilities &= ~SMB2_GLOBAL_CAP_ENCRYPTION;
 690		pr_warn_once("Server does not support requested encryption types\n");
 691		return 0;
 692	} else if ((ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_CCM) &&
 693		   (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_GCM) &&
 694		   (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES256_GCM)) {
 695		/* server returned a cipher we didn't ask for */
 696		pr_warn_once("Invalid SMB3.11 cipher returned\n");
 697		return -EINVAL;
 698	}
 699	server->cipher_type = ctxt->Ciphers[0];
 700	server->capabilities |= SMB2_GLOBAL_CAP_ENCRYPTION;
 701	return 0;
 702}
 703
 704static void decode_signing_ctx(struct TCP_Server_Info *server,
 705			       struct smb2_signing_capabilities *pctxt)
 706{
 707	unsigned int len = le16_to_cpu(pctxt->DataLength);
 708
 709	if ((len < 4) || (len > 16)) {
 710		pr_warn_once("server sent bad signing negcontext\n");
 711		return;
 712	}
 713	if (le16_to_cpu(pctxt->SigningAlgorithmCount) != 1) {
 714		pr_warn_once("Invalid signing algorithm count\n");
 715		return;
 716	}
 717	if (le16_to_cpu(pctxt->SigningAlgorithms[0]) > 2) {
 718		pr_warn_once("unknown signing algorithm\n");
 719		return;
 720	}
 721
 722	server->signing_negotiated = true;
 723	server->signing_algorithm = le16_to_cpu(pctxt->SigningAlgorithms[0]);
 724	cifs_dbg(FYI, "signing algorithm %d chosen\n",
 725		     server->signing_algorithm);
 726}
 727
 728
 729static int smb311_decode_neg_context(struct smb2_negotiate_rsp *rsp,
 730				     struct TCP_Server_Info *server,
 731				     unsigned int len_of_smb)
 732{
 733	struct smb2_neg_context *pctx;
 734	unsigned int offset = le32_to_cpu(rsp->NegotiateContextOffset);
 735	unsigned int ctxt_cnt = le16_to_cpu(rsp->NegotiateContextCount);
 736	unsigned int len_of_ctxts, i;
 737	int rc = 0;
 738
 739	cifs_dbg(FYI, "decoding %d negotiate contexts\n", ctxt_cnt);
 740	if (len_of_smb <= offset) {
 741		cifs_server_dbg(VFS, "Invalid response: negotiate context offset\n");
 742		return -EINVAL;
 743	}
 744
 745	len_of_ctxts = len_of_smb - offset;
 746
 747	for (i = 0; i < ctxt_cnt; i++) {
 748		int clen;
 749		/* check that offset is not beyond end of SMB */
 750		if (len_of_ctxts == 0)
 751			break;
 752
 753		if (len_of_ctxts < sizeof(struct smb2_neg_context))
 754			break;
 755
 756		pctx = (struct smb2_neg_context *)(offset + (char *)rsp);
 757		clen = le16_to_cpu(pctx->DataLength);
 758		if (clen > len_of_ctxts)
 759			break;
 760
 761		if (pctx->ContextType == SMB2_PREAUTH_INTEGRITY_CAPABILITIES)
 762			decode_preauth_context(
 763				(struct smb2_preauth_neg_context *)pctx);
 764		else if (pctx->ContextType == SMB2_ENCRYPTION_CAPABILITIES)
 765			rc = decode_encrypt_ctx(server,
 766				(struct smb2_encryption_neg_context *)pctx);
 767		else if (pctx->ContextType == SMB2_COMPRESSION_CAPABILITIES)
 768			decode_compress_ctx(server,
 769				(struct smb2_compression_capabilities_context *)pctx);
 770		else if (pctx->ContextType == SMB2_POSIX_EXTENSIONS_AVAILABLE)
 771			server->posix_ext_supported = true;
 772		else if (pctx->ContextType == SMB2_SIGNING_CAPABILITIES)
 773			decode_signing_ctx(server,
 774				(struct smb2_signing_capabilities *)pctx);
 775		else
 776			cifs_server_dbg(VFS, "unknown negcontext of type %d ignored\n",
 777				le16_to_cpu(pctx->ContextType));
 778
 779		if (rc)
 780			break;
 781		/* offsets must be 8 byte aligned */
 782		clen = ALIGN(clen, 8);
 783		offset += clen + sizeof(struct smb2_neg_context);
 784		len_of_ctxts -= clen;
 785	}
 786	return rc;
 787}
 788
 789static struct create_posix *
 790create_posix_buf(umode_t mode)
 791{
 792	struct create_posix *buf;
 793
 794	buf = kzalloc(sizeof(struct create_posix),
 795			GFP_KERNEL);
 796	if (!buf)
 797		return NULL;
 798
 799	buf->ccontext.DataOffset =
 800		cpu_to_le16(offsetof(struct create_posix, Mode));
 801	buf->ccontext.DataLength = cpu_to_le32(4);
 802	buf->ccontext.NameOffset =
 803		cpu_to_le16(offsetof(struct create_posix, Name));
 804	buf->ccontext.NameLength = cpu_to_le16(16);
 805
 806	/* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
 807	buf->Name[0] = 0x93;
 808	buf->Name[1] = 0xAD;
 809	buf->Name[2] = 0x25;
 810	buf->Name[3] = 0x50;
 811	buf->Name[4] = 0x9C;
 812	buf->Name[5] = 0xB4;
 813	buf->Name[6] = 0x11;
 814	buf->Name[7] = 0xE7;
 815	buf->Name[8] = 0xB4;
 816	buf->Name[9] = 0x23;
 817	buf->Name[10] = 0x83;
 818	buf->Name[11] = 0xDE;
 819	buf->Name[12] = 0x96;
 820	buf->Name[13] = 0x8B;
 821	buf->Name[14] = 0xCD;
 822	buf->Name[15] = 0x7C;
 823	buf->Mode = cpu_to_le32(mode);
 824	cifs_dbg(FYI, "mode on posix create 0%o\n", mode);
 825	return buf;
 826}
 827
 828static int
 829add_posix_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode)
 830{
 831	struct smb2_create_req *req = iov[0].iov_base;
 832	unsigned int num = *num_iovec;
 833
 834	iov[num].iov_base = create_posix_buf(mode);
 835	if (mode == ACL_NO_MODE)
 836		cifs_dbg(FYI, "Invalid mode\n");
 837	if (iov[num].iov_base == NULL)
 838		return -ENOMEM;
 839	iov[num].iov_len = sizeof(struct create_posix);
 840	if (!req->CreateContextsOffset)
 841		req->CreateContextsOffset = cpu_to_le32(
 842				sizeof(struct smb2_create_req) +
 843				iov[num - 1].iov_len);
 844	le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_posix));
 845	*num_iovec = num + 1;
 846	return 0;
 847}
 848
 849
 850/*
 851 *
 852 *	SMB2 Worker functions follow:
 853 *
 854 *	The general structure of the worker functions is:
 855 *	1) Call smb2_init (assembles SMB2 header)
 856 *	2) Initialize SMB2 command specific fields in fixed length area of SMB
 857 *	3) Call smb_sendrcv2 (sends request on socket and waits for response)
 858 *	4) Decode SMB2 command specific fields in the fixed length area
 859 *	5) Decode variable length data area (if any for this SMB2 command type)
 860 *	6) Call free smb buffer
 861 *	7) return
 862 *
 863 */
 864
 865int
 866SMB2_negotiate(const unsigned int xid,
 867	       struct cifs_ses *ses,
 868	       struct TCP_Server_Info *server)
 869{
 870	struct smb_rqst rqst;
 871	struct smb2_negotiate_req *req;
 872	struct smb2_negotiate_rsp *rsp;
 873	struct kvec iov[1];
 874	struct kvec rsp_iov;
 875	int rc;
 876	int resp_buftype;
 
 877	int blob_offset, blob_length;
 878	char *security_blob;
 879	int flags = CIFS_NEG_OP;
 880	unsigned int total_len;
 881
 882	cifs_dbg(FYI, "Negotiate protocol\n");
 883
 884	if (!server) {
 885		WARN(1, "%s: server is NULL!\n", __func__);
 886		return -EIO;
 887	}
 888
 889	rc = smb2_plain_req_init(SMB2_NEGOTIATE, NULL, server,
 890				 (void **) &req, &total_len);
 891	if (rc)
 892		return rc;
 893
 894	req->hdr.SessionId = 0;
 895
 896	memset(server->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 897	memset(ses->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 898
 899	if (strcmp(server->vals->version_string,
 900		   SMB3ANY_VERSION_STRING) == 0) {
 901		req->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
 902		req->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
 903		req->Dialects[2] = cpu_to_le16(SMB311_PROT_ID);
 904		req->DialectCount = cpu_to_le16(3);
 905		total_len += 6;
 906	} else if (strcmp(server->vals->version_string,
 907		   SMBDEFAULT_VERSION_STRING) == 0) {
 908		req->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
 909		req->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
 910		req->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
 911		req->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
 912		req->DialectCount = cpu_to_le16(4);
 913		total_len += 8;
 914	} else {
 915		/* otherwise send specific dialect */
 916		req->Dialects[0] = cpu_to_le16(server->vals->protocol_id);
 917		req->DialectCount = cpu_to_le16(1);
 918		total_len += 2;
 919	}
 920
 921	/* only one of SMB2 signing flags may be set in SMB2 request */
 922	if (ses->sign)
 923		req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 924	else if (global_secflags & CIFSSEC_MAY_SIGN)
 925		req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 926	else
 927		req->SecurityMode = 0;
 928
 929	req->Capabilities = cpu_to_le32(server->vals->req_capabilities);
 930	if (ses->chan_max > 1)
 931		req->Capabilities |= cpu_to_le32(SMB2_GLOBAL_CAP_MULTI_CHANNEL);
 932
 933	/* ClientGUID must be zero for SMB2.02 dialect */
 934	if (server->vals->protocol_id == SMB20_PROT_ID)
 935		memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
 936	else {
 937		memcpy(req->ClientGUID, server->client_guid,
 938			SMB2_CLIENT_GUID_SIZE);
 939		if ((server->vals->protocol_id == SMB311_PROT_ID) ||
 940		    (strcmp(server->vals->version_string,
 941		     SMB3ANY_VERSION_STRING) == 0) ||
 942		    (strcmp(server->vals->version_string,
 943		     SMBDEFAULT_VERSION_STRING) == 0))
 944			assemble_neg_contexts(req, server, &total_len);
 945	}
 946	iov[0].iov_base = (char *)req;
 947	iov[0].iov_len = total_len;
 948
 949	memset(&rqst, 0, sizeof(struct smb_rqst));
 950	rqst.rq_iov = iov;
 951	rqst.rq_nvec = 1;
 952
 953	rc = cifs_send_recv(xid, ses, server,
 954			    &rqst, &resp_buftype, flags, &rsp_iov);
 955	cifs_small_buf_release(req);
 956	rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base;
 957	/*
 958	 * No tcon so can't do
 959	 * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 960	 */
 961	if (rc == -EOPNOTSUPP) {
 962		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");
 963		goto neg_exit;
 964	} else if (rc != 0)
 965		goto neg_exit;
 966
 967	rc = -EIO;
 968	if (strcmp(server->vals->version_string,
 969		   SMB3ANY_VERSION_STRING) == 0) {
 970		if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 971			cifs_server_dbg(VFS,
 972				"SMB2 dialect returned but not requested\n");
 973			goto neg_exit;
 974		} else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 975			cifs_server_dbg(VFS,
 976				"SMB2.1 dialect returned but not requested\n");
 977			goto neg_exit;
 978		} else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
 979			/* ops set to 3.0 by default for default so update */
 980			server->ops = &smb311_operations;
 981			server->vals = &smb311_values;
 982		}
 983	} else if (strcmp(server->vals->version_string,
 984		   SMBDEFAULT_VERSION_STRING) == 0) {
 985		if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 986			cifs_server_dbg(VFS,
 987				"SMB2 dialect returned but not requested\n");
 988			goto neg_exit;
 989		} else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 990			/* ops set to 3.0 by default for default so update */
 991			server->ops = &smb21_operations;
 992			server->vals = &smb21_values;
 993		} else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
 994			server->ops = &smb311_operations;
 995			server->vals = &smb311_values;
 996		}
 997	} else if (le16_to_cpu(rsp->DialectRevision) !=
 998				server->vals->protocol_id) {
 999		/* if requested single dialect ensure returned dialect matched */
1000		cifs_server_dbg(VFS, "Invalid 0x%x dialect returned: not requested\n",
1001				le16_to_cpu(rsp->DialectRevision));
1002		goto neg_exit;
1003	}
1004
1005	cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
1006
1007	if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
1008		cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
1009	else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
1010		cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
1011	else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
1012		cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
1013	else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
1014		cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
1015	else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
1016		cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
1017	else {
1018		cifs_server_dbg(VFS, "Invalid dialect returned by server 0x%x\n",
1019				le16_to_cpu(rsp->DialectRevision));
 
1020		goto neg_exit;
1021	}
1022
1023	rc = 0;
1024	server->dialect = le16_to_cpu(rsp->DialectRevision);
1025
1026	/*
1027	 * Keep a copy of the hash after negprot. This hash will be
1028	 * the starting hash value for all sessions made from this
1029	 * server.
1030	 */
1031	memcpy(server->preauth_sha_hash, ses->preauth_sha_hash,
1032	       SMB2_PREAUTH_HASH_SIZE);
1033
1034	/* SMB2 only has an extended negflavor */
1035	server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
1036	/* set it to the maximum buffer size value we can send with 1 credit */
1037	server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
1038			       SMB2_MAX_BUFFER_SIZE);
1039	server->max_read = le32_to_cpu(rsp->MaxReadSize);
1040	server->max_write = le32_to_cpu(rsp->MaxWriteSize);
1041	server->sec_mode = le16_to_cpu(rsp->SecurityMode);
1042	if ((server->sec_mode & SMB2_SEC_MODE_FLAGS_ALL) != server->sec_mode)
1043		cifs_dbg(FYI, "Server returned unexpected security mode 0x%x\n",
1044				server->sec_mode);
1045	server->capabilities = le32_to_cpu(rsp->Capabilities);
1046	/* Internal types */
1047	server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
1048
1049	/*
1050	 * SMB3.0 supports only 1 cipher and doesn't have a encryption neg context
1051	 * Set the cipher type manually.
1052	 */
1053	if (server->dialect == SMB30_PROT_ID && (server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1054		server->cipher_type = SMB2_ENCRYPTION_AES128_CCM;
1055
1056	security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
1057					       (struct smb2_hdr *)rsp);
1058	/*
1059	 * See MS-SMB2 section 2.2.4: if no blob, client picks default which
1060	 * for us will be
1061	 *	ses->sectype = RawNTLMSSP;
1062	 * but for time being this is our only auth choice so doesn't matter.
1063	 * We just found a server which sets blob length to zero expecting raw.
1064	 */
1065	if (blob_length == 0) {
1066		cifs_dbg(FYI, "missing security blob on negprot\n");
1067		server->sec_ntlmssp = true;
1068	}
1069
1070	rc = cifs_enable_signing(server, ses->sign);
1071	if (rc)
1072		goto neg_exit;
1073	if (blob_length) {
1074		rc = decode_negTokenInit(security_blob, blob_length, server);
1075		if (rc == 1)
1076			rc = 0;
1077		else if (rc == 0)
1078			rc = -EIO;
1079	}
1080
1081	if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
1082		if (rsp->NegotiateContextCount)
1083			rc = smb311_decode_neg_context(rsp, server,
1084						       rsp_iov.iov_len);
1085		else
1086			cifs_server_dbg(VFS, "Missing expected negotiate contexts\n");
1087	}
1088neg_exit:
1089	free_rsp_buf(resp_buftype, rsp);
1090	return rc;
1091}
1092
1093int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
1094{
1095	int rc;
1096	struct validate_negotiate_info_req *pneg_inbuf;
1097	struct validate_negotiate_info_rsp *pneg_rsp = NULL;
1098	u32 rsplen;
1099	u32 inbuflen; /* max of 4 dialects */
1100	struct TCP_Server_Info *server = tcon->ses->server;
1101
1102	cifs_dbg(FYI, "validate negotiate\n");
1103
1104	/* In SMB3.11 preauth integrity supersedes validate negotiate */
1105	if (server->dialect == SMB311_PROT_ID)
1106		return 0;
1107
1108	/*
1109	 * validation ioctl must be signed, so no point sending this if we
1110	 * can not sign it (ie are not known user).  Even if signing is not
1111	 * required (enabled but not negotiated), in those cases we selectively
1112	 * sign just this, the first and only signed request on a connection.
1113	 * Having validation of negotiate info  helps reduce attack vectors.
1114	 */
1115	if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
1116		return 0; /* validation requires signing */
1117
1118	if (tcon->ses->user_name == NULL) {
1119		cifs_dbg(FYI, "Can't validate negotiate: null user mount\n");
1120		return 0; /* validation requires signing */
1121	}
1122
1123	if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)
1124		cifs_tcon_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n");
1125
1126	pneg_inbuf = kmalloc(sizeof(*pneg_inbuf), GFP_NOFS);
1127	if (!pneg_inbuf)
1128		return -ENOMEM;
1129
1130	pneg_inbuf->Capabilities =
1131			cpu_to_le32(server->vals->req_capabilities);
1132	if (tcon->ses->chan_max > 1)
1133		pneg_inbuf->Capabilities |= cpu_to_le32(SMB2_GLOBAL_CAP_MULTI_CHANNEL);
1134
1135	memcpy(pneg_inbuf->Guid, server->client_guid,
1136					SMB2_CLIENT_GUID_SIZE);
1137
1138	if (tcon->ses->sign)
1139		pneg_inbuf->SecurityMode =
1140			cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
1141	else if (global_secflags & CIFSSEC_MAY_SIGN)
1142		pneg_inbuf->SecurityMode =
1143			cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
1144	else
1145		pneg_inbuf->SecurityMode = 0;
1146
1147
1148	if (strcmp(server->vals->version_string,
1149		SMB3ANY_VERSION_STRING) == 0) {
1150		pneg_inbuf->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
1151		pneg_inbuf->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
1152		pneg_inbuf->Dialects[2] = cpu_to_le16(SMB311_PROT_ID);
1153		pneg_inbuf->DialectCount = cpu_to_le16(3);
1154		/* SMB 2.1 not included so subtract one dialect from len */
1155		inbuflen = sizeof(*pneg_inbuf) -
1156				(sizeof(pneg_inbuf->Dialects[0]));
1157	} else if (strcmp(server->vals->version_string,
1158		SMBDEFAULT_VERSION_STRING) == 0) {
1159		pneg_inbuf->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
1160		pneg_inbuf->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
1161		pneg_inbuf->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
1162		pneg_inbuf->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
1163		pneg_inbuf->DialectCount = cpu_to_le16(4);
1164		/* structure is big enough for 4 dialects */
1165		inbuflen = sizeof(*pneg_inbuf);
1166	} else {
1167		/* otherwise specific dialect was requested */
1168		pneg_inbuf->Dialects[0] =
1169			cpu_to_le16(server->vals->protocol_id);
1170		pneg_inbuf->DialectCount = cpu_to_le16(1);
1171		/* structure is big enough for 4 dialects, sending only 1 */
1172		inbuflen = sizeof(*pneg_inbuf) -
1173				sizeof(pneg_inbuf->Dialects[0]) * 3;
1174	}
1175
1176	rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
1177		FSCTL_VALIDATE_NEGOTIATE_INFO,
1178		(char *)pneg_inbuf, inbuflen, CIFSMaxBufSize,
1179		(char **)&pneg_rsp, &rsplen);
1180	if (rc == -EOPNOTSUPP) {
1181		/*
1182		 * Old Windows versions or Netapp SMB server can return
1183		 * not supported error. Client should accept it.
1184		 */
1185		cifs_tcon_dbg(VFS, "Server does not support validate negotiate\n");
1186		rc = 0;
1187		goto out_free_inbuf;
1188	} else if (rc != 0) {
1189		cifs_tcon_dbg(VFS, "validate protocol negotiate failed: %d\n",
1190			      rc);
1191		rc = -EIO;
1192		goto out_free_inbuf;
1193	}
1194
1195	rc = -EIO;
1196	if (rsplen != sizeof(*pneg_rsp)) {
1197		cifs_tcon_dbg(VFS, "Invalid protocol negotiate response size: %d\n",
1198			      rsplen);
1199
1200		/* relax check since Mac returns max bufsize allowed on ioctl */
1201		if (rsplen > CIFSMaxBufSize || rsplen < sizeof(*pneg_rsp))
1202			goto out_free_rsp;
1203	}
1204
1205	/* check validate negotiate info response matches what we got earlier */
1206	if (pneg_rsp->Dialect != cpu_to_le16(server->dialect))
1207		goto vneg_out;
1208
1209	if (pneg_rsp->SecurityMode != cpu_to_le16(server->sec_mode))
1210		goto vneg_out;
1211
1212	/* do not validate server guid because not saved at negprot time yet */
1213
1214	if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
1215	      SMB2_LARGE_FILES) != server->capabilities)
1216		goto vneg_out;
1217
1218	/* validate negotiate successful */
1219	rc = 0;
1220	cifs_dbg(FYI, "validate negotiate info successful\n");
1221	goto out_free_rsp;
1222
1223vneg_out:
1224	cifs_tcon_dbg(VFS, "protocol revalidation - security settings mismatch\n");
1225out_free_rsp:
1226	kfree(pneg_rsp);
1227out_free_inbuf:
1228	kfree(pneg_inbuf);
1229	return rc;
1230}
1231
1232enum securityEnum
1233smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
1234{
1235	switch (requested) {
1236	case Kerberos:
1237	case RawNTLMSSP:
1238		return requested;
1239	case NTLMv2:
1240		return RawNTLMSSP;
1241	case Unspecified:
1242		if (server->sec_ntlmssp &&
1243			(global_secflags & CIFSSEC_MAY_NTLMSSP))
1244			return RawNTLMSSP;
1245		if ((server->sec_kerberos || server->sec_mskerberos) &&
1246			(global_secflags & CIFSSEC_MAY_KRB5))
1247			return Kerberos;
1248		fallthrough;
1249	default:
1250		return Unspecified;
1251	}
1252}
1253
1254struct SMB2_sess_data {
1255	unsigned int xid;
1256	struct cifs_ses *ses;
1257	struct TCP_Server_Info *server;
1258	struct nls_table *nls_cp;
1259	void (*func)(struct SMB2_sess_data *);
1260	int result;
1261	u64 previous_session;
1262
1263	/* we will send the SMB in three pieces:
1264	 * a fixed length beginning part, an optional
1265	 * SPNEGO blob (which can be zero length), and a
1266	 * last part which will include the strings
1267	 * and rest of bcc area. This allows us to avoid
1268	 * a large buffer 17K allocation
1269	 */
1270	int buf0_type;
1271	struct kvec iov[2];
1272};
1273
1274static int
1275SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
1276{
1277	int rc;
1278	struct cifs_ses *ses = sess_data->ses;
1279	struct TCP_Server_Info *server = sess_data->server;
1280	struct smb2_sess_setup_req *req;
 
1281	unsigned int total_len;
1282	bool is_binding = false;
1283
1284	rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, server,
1285				 (void **) &req,
1286				 &total_len);
1287	if (rc)
1288		return rc;
1289
1290	spin_lock(&ses->chan_lock);
1291	is_binding = !CIFS_ALL_CHANS_NEED_RECONNECT(ses);
1292	spin_unlock(&ses->chan_lock);
1293
1294	if (is_binding) {
1295		req->hdr.SessionId = cpu_to_le64(ses->Suid);
1296		req->hdr.Flags |= SMB2_FLAGS_SIGNED;
1297		req->PreviousSessionId = 0;
1298		req->Flags = SMB2_SESSION_REQ_FLAG_BINDING;
1299		cifs_dbg(FYI, "Binding to sess id: %llx\n", ses->Suid);
1300	} else {
1301		/* First session, not a reauthenticate */
1302		req->hdr.SessionId = 0;
1303		/*
1304		 * if reconnect, we need to send previous sess id
1305		 * otherwise it is 0
1306		 */
1307		req->PreviousSessionId = cpu_to_le64(sess_data->previous_session);
1308		req->Flags = 0; /* MBZ */
1309		cifs_dbg(FYI, "Fresh session. Previous: %llx\n",
1310			 sess_data->previous_session);
1311	}
1312
1313	/* enough to enable echos and oplocks and one max size write */
1314	req->hdr.CreditRequest = cpu_to_le16(130);
1315
1316	/* only one of SMB2 signing flags may be set in SMB2 request */
1317	if (server->sign)
1318		req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
1319	else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
1320		req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
1321	else
1322		req->SecurityMode = 0;
1323
1324#ifdef CONFIG_CIFS_DFS_UPCALL
1325	req->Capabilities = cpu_to_le32(SMB2_GLOBAL_CAP_DFS);
1326#else
1327	req->Capabilities = 0;
1328#endif /* DFS_UPCALL */
1329
1330	req->Channel = 0; /* MBZ */
1331
1332	sess_data->iov[0].iov_base = (char *)req;
1333	/* 1 for pad */
1334	sess_data->iov[0].iov_len = total_len - 1;
1335	/*
1336	 * This variable will be used to clear the buffer
1337	 * allocated above in case of any error in the calling function.
1338	 */
1339	sess_data->buf0_type = CIFS_SMALL_BUFFER;
1340
1341	return 0;
1342}
1343
1344static void
1345SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)
1346{
1347	struct kvec *iov = sess_data->iov;
1348
1349	/* iov[1] is already freed by caller */
1350	if (sess_data->buf0_type != CIFS_NO_BUFFER && iov[0].iov_base)
1351		memzero_explicit(iov[0].iov_base, iov[0].iov_len);
1352
1353	free_rsp_buf(sess_data->buf0_type, iov[0].iov_base);
1354	sess_data->buf0_type = CIFS_NO_BUFFER;
1355}
1356
1357static int
1358SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
1359{
1360	int rc;
1361	struct smb_rqst rqst;
1362	struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
1363	struct kvec rsp_iov = { NULL, 0 };
1364
1365	/* Testing shows that buffer offset must be at location of Buffer[0] */
1366	req->SecurityBufferOffset =
1367		cpu_to_le16(sizeof(struct smb2_sess_setup_req) - 1 /* pad */);
1368	req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);
1369
1370	memset(&rqst, 0, sizeof(struct smb_rqst));
1371	rqst.rq_iov = sess_data->iov;
1372	rqst.rq_nvec = 2;
1373
1374	/* BB add code to build os and lm fields */
1375	rc = cifs_send_recv(sess_data->xid, sess_data->ses,
1376			    sess_data->server,
1377			    &rqst,
1378			    &sess_data->buf0_type,
1379			    CIFS_LOG_ERROR | CIFS_SESS_OP, &rsp_iov);
1380	cifs_small_buf_release(sess_data->iov[0].iov_base);
1381	memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
1382
1383	return rc;
1384}
1385
1386static int
1387SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)
1388{
1389	int rc = 0;
1390	struct cifs_ses *ses = sess_data->ses;
1391	struct TCP_Server_Info *server = sess_data->server;
1392
1393	cifs_server_lock(server);
1394	if (server->ops->generate_signingkey) {
1395		rc = server->ops->generate_signingkey(ses, server);
1396		if (rc) {
1397			cifs_dbg(FYI,
1398				"SMB3 session key generation failed\n");
1399			cifs_server_unlock(server);
1400			return rc;
1401		}
1402	}
1403	if (!server->session_estab) {
1404		server->sequence_number = 0x2;
1405		server->session_estab = true;
1406	}
1407	cifs_server_unlock(server);
1408
1409	cifs_dbg(FYI, "SMB2/3 session established successfully\n");
 
 
 
 
 
 
 
 
1410	return rc;
1411}
1412
1413#ifdef CONFIG_CIFS_UPCALL
1414static void
1415SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1416{
1417	int rc;
1418	struct cifs_ses *ses = sess_data->ses;
1419	struct TCP_Server_Info *server = sess_data->server;
1420	struct cifs_spnego_msg *msg;
1421	struct key *spnego_key = NULL;
1422	struct smb2_sess_setup_rsp *rsp = NULL;
1423	bool is_binding = false;
1424
1425	rc = SMB2_sess_alloc_buffer(sess_data);
1426	if (rc)
1427		goto out;
1428
1429	spnego_key = cifs_get_spnego_key(ses, server);
1430	if (IS_ERR(spnego_key)) {
1431		rc = PTR_ERR(spnego_key);
1432		if (rc == -ENOKEY)
1433			cifs_dbg(VFS, "Verify user has a krb5 ticket and keyutils is installed\n");
1434		spnego_key = NULL;
1435		goto out;
1436	}
1437
1438	msg = spnego_key->payload.data[0];
1439	/*
1440	 * check version field to make sure that cifs.upcall is
1441	 * sending us a response in an expected form
1442	 */
1443	if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1444		cifs_dbg(VFS, "bad cifs.upcall version. Expected %d got %d\n",
1445			 CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1446		rc = -EKEYREJECTED;
1447		goto out_put_spnego_key;
1448	}
1449
1450	spin_lock(&ses->chan_lock);
1451	is_binding = !CIFS_ALL_CHANS_NEED_RECONNECT(ses);
1452	spin_unlock(&ses->chan_lock);
1453
1454	/* keep session key if binding */
1455	if (!is_binding) {
1456		kfree_sensitive(ses->auth_key.response);
1457		ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1458						 GFP_KERNEL);
1459		if (!ses->auth_key.response) {
1460			cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory\n",
1461				 msg->sesskey_len);
1462			rc = -ENOMEM;
1463			goto out_put_spnego_key;
1464		}
1465		ses->auth_key.len = msg->sesskey_len;
1466	}
1467
1468	sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1469	sess_data->iov[1].iov_len = msg->secblob_len;
1470
1471	rc = SMB2_sess_sendreceive(sess_data);
1472	if (rc)
1473		goto out_put_spnego_key;
1474
1475	rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1476	/* keep session id and flags if binding */
1477	if (!is_binding) {
1478		ses->Suid = le64_to_cpu(rsp->hdr.SessionId);
1479		ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1480	}
1481
1482	rc = SMB2_sess_establish_session(sess_data);
1483out_put_spnego_key:
1484	key_invalidate(spnego_key);
1485	key_put(spnego_key);
1486	if (rc) {
1487		kfree_sensitive(ses->auth_key.response);
1488		ses->auth_key.response = NULL;
1489		ses->auth_key.len = 0;
1490	}
1491out:
1492	sess_data->result = rc;
1493	sess_data->func = NULL;
1494	SMB2_sess_free_buffer(sess_data);
1495}
1496#else
1497static void
1498SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1499{
1500	cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1501	sess_data->result = -EOPNOTSUPP;
1502	sess_data->func = NULL;
1503}
1504#endif
1505
1506static void
1507SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);
1508
1509static void
1510SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
1511{
1512	int rc;
1513	struct cifs_ses *ses = sess_data->ses;
1514	struct TCP_Server_Info *server = sess_data->server;
1515	struct smb2_sess_setup_rsp *rsp = NULL;
1516	unsigned char *ntlmssp_blob = NULL;
1517	bool use_spnego = false; /* else use raw ntlmssp */
1518	u16 blob_length = 0;
1519	bool is_binding = false;
1520
1521	/*
1522	 * If memory allocation is successful, caller of this function
1523	 * frees it.
1524	 */
1525	ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1526	if (!ses->ntlmssp) {
1527		rc = -ENOMEM;
1528		goto out_err;
1529	}
1530	ses->ntlmssp->sesskey_per_smbsess = true;
1531
1532	rc = SMB2_sess_alloc_buffer(sess_data);
1533	if (rc)
1534		goto out_err;
1535
1536	rc = build_ntlmssp_smb3_negotiate_blob(&ntlmssp_blob,
1537					  &blob_length, ses, server,
1538					  sess_data->nls_cp);
1539	if (rc)
1540		goto out;
 
1541
 
1542	if (use_spnego) {
1543		/* BB eventually need to add this */
1544		cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1545		rc = -EOPNOTSUPP;
1546		goto out;
 
 
 
1547	}
1548	sess_data->iov[1].iov_base = ntlmssp_blob;
1549	sess_data->iov[1].iov_len = blob_length;
1550
1551	rc = SMB2_sess_sendreceive(sess_data);
1552	rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1553
1554	/* If true, rc here is expected and not an error */
1555	if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1556		rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
1557		rc = 0;
1558
1559	if (rc)
1560		goto out;
1561
1562	if (offsetof(struct smb2_sess_setup_rsp, Buffer) !=
1563			le16_to_cpu(rsp->SecurityBufferOffset)) {
1564		cifs_dbg(VFS, "Invalid security buffer offset %d\n",
1565			le16_to_cpu(rsp->SecurityBufferOffset));
1566		rc = -EIO;
1567		goto out;
1568	}
1569	rc = decode_ntlmssp_challenge(rsp->Buffer,
1570			le16_to_cpu(rsp->SecurityBufferLength), ses);
1571	if (rc)
1572		goto out;
1573
1574	cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1575
1576	spin_lock(&ses->chan_lock);
1577	is_binding = !CIFS_ALL_CHANS_NEED_RECONNECT(ses);
1578	spin_unlock(&ses->chan_lock);
1579
1580	/* keep existing ses id and flags if binding */
1581	if (!is_binding) {
1582		ses->Suid = le64_to_cpu(rsp->hdr.SessionId);
1583		ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1584	}
1585
1586out:
1587	kfree_sensitive(ntlmssp_blob);
1588	SMB2_sess_free_buffer(sess_data);
1589	if (!rc) {
1590		sess_data->result = 0;
1591		sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
1592		return;
1593	}
1594out_err:
1595	kfree_sensitive(ses->ntlmssp);
1596	ses->ntlmssp = NULL;
1597	sess_data->result = rc;
1598	sess_data->func = NULL;
1599}
1600
1601static void
1602SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
1603{
1604	int rc;
1605	struct cifs_ses *ses = sess_data->ses;
1606	struct TCP_Server_Info *server = sess_data->server;
1607	struct smb2_sess_setup_req *req;
1608	struct smb2_sess_setup_rsp *rsp = NULL;
1609	unsigned char *ntlmssp_blob = NULL;
1610	bool use_spnego = false; /* else use raw ntlmssp */
1611	u16 blob_length = 0;
1612	bool is_binding = false;
1613
1614	rc = SMB2_sess_alloc_buffer(sess_data);
1615	if (rc)
1616		goto out;
1617
1618	req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
1619	req->hdr.SessionId = cpu_to_le64(ses->Suid);
1620
1621	rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length,
1622				     ses, server,
1623				     sess_data->nls_cp);
1624	if (rc) {
1625		cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
1626		goto out;
1627	}
1628
1629	if (use_spnego) {
1630		/* BB eventually need to add this */
1631		cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1632		rc = -EOPNOTSUPP;
1633		goto out;
1634	}
1635	sess_data->iov[1].iov_base = ntlmssp_blob;
1636	sess_data->iov[1].iov_len = blob_length;
1637
1638	rc = SMB2_sess_sendreceive(sess_data);
1639	if (rc)
1640		goto out;
1641
1642	rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1643
1644	spin_lock(&ses->chan_lock);
1645	is_binding = !CIFS_ALL_CHANS_NEED_RECONNECT(ses);
1646	spin_unlock(&ses->chan_lock);
1647
1648	/* keep existing ses id and flags if binding */
1649	if (!is_binding) {
1650		ses->Suid = le64_to_cpu(rsp->hdr.SessionId);
1651		ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1652	}
1653
1654	rc = SMB2_sess_establish_session(sess_data);
1655#ifdef CONFIG_CIFS_DEBUG_DUMP_KEYS
1656	if (ses->server->dialect < SMB30_PROT_ID) {
1657		cifs_dbg(VFS, "%s: dumping generated SMB2 session keys\n", __func__);
1658		/*
1659		 * The session id is opaque in terms of endianness, so we can't
1660		 * print it as a long long. we dump it as we got it on the wire
1661		 */
1662		cifs_dbg(VFS, "Session Id    %*ph\n", (int)sizeof(ses->Suid),
1663			 &ses->Suid);
1664		cifs_dbg(VFS, "Session Key   %*ph\n",
1665			 SMB2_NTLMV2_SESSKEY_SIZE, ses->auth_key.response);
1666		cifs_dbg(VFS, "Signing Key   %*ph\n",
1667			 SMB3_SIGN_KEY_SIZE, ses->auth_key.response);
1668	}
1669#endif
1670out:
1671	kfree_sensitive(ntlmssp_blob);
1672	SMB2_sess_free_buffer(sess_data);
1673	kfree_sensitive(ses->ntlmssp);
1674	ses->ntlmssp = NULL;
1675	sess_data->result = rc;
1676	sess_data->func = NULL;
1677}
1678
1679static int
1680SMB2_select_sec(struct SMB2_sess_data *sess_data)
1681{
1682	int type;
1683	struct cifs_ses *ses = sess_data->ses;
1684	struct TCP_Server_Info *server = sess_data->server;
1685
1686	type = smb2_select_sectype(server, ses->sectype);
1687	cifs_dbg(FYI, "sess setup type %d\n", type);
1688	if (type == Unspecified) {
1689		cifs_dbg(VFS, "Unable to select appropriate authentication method!\n");
1690		return -EINVAL;
1691	}
1692
1693	switch (type) {
1694	case Kerberos:
1695		sess_data->func = SMB2_auth_kerberos;
1696		break;
1697	case RawNTLMSSP:
1698		sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
1699		break;
1700	default:
1701		cifs_dbg(VFS, "secType %d not supported!\n", type);
1702		return -EOPNOTSUPP;
1703	}
1704
1705	return 0;
1706}
1707
1708int
1709SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
1710		struct TCP_Server_Info *server,
1711		const struct nls_table *nls_cp)
1712{
1713	int rc = 0;
 
1714	struct SMB2_sess_data *sess_data;
1715
1716	cifs_dbg(FYI, "Session Setup\n");
1717
1718	if (!server) {
1719		WARN(1, "%s: server is NULL!\n", __func__);
1720		return -EIO;
1721	}
1722
1723	sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
1724	if (!sess_data)
1725		return -ENOMEM;
1726
 
 
 
1727	sess_data->xid = xid;
1728	sess_data->ses = ses;
1729	sess_data->server = server;
1730	sess_data->buf0_type = CIFS_NO_BUFFER;
1731	sess_data->nls_cp = (struct nls_table *) nls_cp;
1732	sess_data->previous_session = ses->Suid;
1733
1734	rc = SMB2_select_sec(sess_data);
1735	if (rc)
1736		goto out;
1737
1738	/*
1739	 * Initialize the session hash with the server one.
1740	 */
1741	memcpy(ses->preauth_sha_hash, server->preauth_sha_hash,
1742	       SMB2_PREAUTH_HASH_SIZE);
1743
1744	while (sess_data->func)
1745		sess_data->func(sess_data);
1746
1747	if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign))
1748		cifs_server_dbg(VFS, "signing requested but authenticated as guest\n");
1749	rc = sess_data->result;
1750out:
1751	kfree_sensitive(sess_data);
1752	return rc;
1753}
1754
1755int
1756SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
1757{
1758	struct smb_rqst rqst;
1759	struct smb2_logoff_req *req; /* response is also trivial struct */
1760	int rc = 0;
1761	struct TCP_Server_Info *server;
1762	int flags = 0;
1763	unsigned int total_len;
1764	struct kvec iov[1];
1765	struct kvec rsp_iov;
1766	int resp_buf_type;
1767
1768	cifs_dbg(FYI, "disconnect session %p\n", ses);
1769
1770	if (ses && (ses->server))
1771		server = ses->server;
1772	else
1773		return -EIO;
1774
1775	/* no need to send SMB logoff if uid already closed due to reconnect */
1776	spin_lock(&ses->chan_lock);
1777	if (CIFS_ALL_CHANS_NEED_RECONNECT(ses)) {
1778		spin_unlock(&ses->chan_lock);
1779		goto smb2_session_already_dead;
1780	}
1781	spin_unlock(&ses->chan_lock);
1782
1783	rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, ses->server,
1784				 (void **) &req, &total_len);
1785	if (rc)
1786		return rc;
1787
1788	 /* since no tcon, smb2_init can not do this, so do here */
1789	req->hdr.SessionId = cpu_to_le64(ses->Suid);
1790
1791	if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
1792		flags |= CIFS_TRANSFORM_REQ;
1793	else if (server->sign)
1794		req->hdr.Flags |= SMB2_FLAGS_SIGNED;
1795
1796	flags |= CIFS_NO_RSP_BUF;
1797
1798	iov[0].iov_base = (char *)req;
1799	iov[0].iov_len = total_len;
1800
1801	memset(&rqst, 0, sizeof(struct smb_rqst));
1802	rqst.rq_iov = iov;
1803	rqst.rq_nvec = 1;
1804
1805	rc = cifs_send_recv(xid, ses, ses->server,
1806			    &rqst, &resp_buf_type, flags, &rsp_iov);
1807	cifs_small_buf_release(req);
1808	/*
1809	 * No tcon so can't do
1810	 * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1811	 */
1812
1813smb2_session_already_dead:
1814	return rc;
1815}
1816
1817static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
1818{
1819	cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
1820}
1821
1822#define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
1823
1824/* These are similar values to what Windows uses */
1825static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
1826{
1827	tcon->max_chunks = 256;
1828	tcon->max_bytes_chunk = 1048576;
1829	tcon->max_bytes_copy = 16777216;
1830}
1831
1832int
1833SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
1834	  struct cifs_tcon *tcon, const struct nls_table *cp)
1835{
1836	struct smb_rqst rqst;
1837	struct smb2_tree_connect_req *req;
1838	struct smb2_tree_connect_rsp *rsp = NULL;
1839	struct kvec iov[2];
1840	struct kvec rsp_iov = { NULL, 0 };
1841	int rc = 0;
1842	int resp_buftype;
1843	int unc_path_len;
1844	__le16 *unc_path = NULL;
1845	int flags = 0;
1846	unsigned int total_len;
1847	struct TCP_Server_Info *server;
1848
1849	/* always use master channel */
1850	server = ses->server;
1851
1852	cifs_dbg(FYI, "TCON\n");
1853
1854	if (!server || !tree)
1855		return -EIO;
1856
1857	unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
1858	if (unc_path == NULL)
1859		return -ENOMEM;
1860
1861	unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
1862	unc_path_len *= 2;
1863	if (unc_path_len < 2) {
1864		kfree(unc_path);
1865		return -EINVAL;
1866	}
1867
1868	/* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
1869	tcon->tid = 0;
1870	atomic_set(&tcon->num_remote_opens, 0);
1871	rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, server,
1872				 (void **) &req, &total_len);
1873	if (rc) {
1874		kfree(unc_path);
1875		return rc;
1876	}
1877
1878	if (smb3_encryption_required(tcon))
1879		flags |= CIFS_TRANSFORM_REQ;
1880
1881	iov[0].iov_base = (char *)req;
1882	/* 1 for pad */
1883	iov[0].iov_len = total_len - 1;
1884
1885	/* Testing shows that buffer offset must be at location of Buffer[0] */
1886	req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
1887			- 1 /* pad */);
1888	req->PathLength = cpu_to_le16(unc_path_len - 2);
1889	iov[1].iov_base = unc_path;
1890	iov[1].iov_len = unc_path_len;
1891
1892	/*
1893	 * 3.11 tcon req must be signed if not encrypted. See MS-SMB2 3.2.4.1.1
1894	 * unless it is guest or anonymous user. See MS-SMB2 3.2.5.3.1
1895	 * (Samba servers don't always set the flag so also check if null user)
1896	 */
1897	if ((server->dialect == SMB311_PROT_ID) &&
1898	    !smb3_encryption_required(tcon) &&
1899	    !(ses->session_flags &
1900		    (SMB2_SESSION_FLAG_IS_GUEST|SMB2_SESSION_FLAG_IS_NULL)) &&
1901	    ((ses->user_name != NULL) || (ses->sectype == Kerberos)))
1902		req->hdr.Flags |= SMB2_FLAGS_SIGNED;
1903
1904	memset(&rqst, 0, sizeof(struct smb_rqst));
1905	rqst.rq_iov = iov;
1906	rqst.rq_nvec = 2;
1907
1908	/* Need 64 for max size write so ask for more in case not there yet */
1909	req->hdr.CreditRequest = cpu_to_le16(64);
1910
1911	rc = cifs_send_recv(xid, ses, server,
1912			    &rqst, &resp_buftype, flags, &rsp_iov);
1913	cifs_small_buf_release(req);
1914	rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
1915	trace_smb3_tcon(xid, tcon->tid, ses->Suid, tree, rc);
1916	if ((rc != 0) || (rsp == NULL)) {
1917		cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
1918		tcon->need_reconnect = true;
 
 
1919		goto tcon_error_exit;
1920	}
1921
1922	switch (rsp->ShareType) {
1923	case SMB2_SHARE_TYPE_DISK:
1924		cifs_dbg(FYI, "connection to disk share\n");
1925		break;
1926	case SMB2_SHARE_TYPE_PIPE:
1927		tcon->pipe = true;
1928		cifs_dbg(FYI, "connection to pipe share\n");
1929		break;
1930	case SMB2_SHARE_TYPE_PRINT:
1931		tcon->print = true;
1932		cifs_dbg(FYI, "connection to printer\n");
1933		break;
1934	default:
1935		cifs_server_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
1936		rc = -EOPNOTSUPP;
1937		goto tcon_error_exit;
1938	}
1939
1940	tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
1941	tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
1942	tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
1943	tcon->tid = le32_to_cpu(rsp->hdr.Id.SyncId.TreeId);
1944	strscpy(tcon->tree_name, tree, sizeof(tcon->tree_name));
 
 
1945
1946	if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
1947	    ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
1948		cifs_tcon_dbg(VFS, "DFS capability contradicts DFS flag\n");
1949
1950	if (tcon->seal &&
1951	    !(server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1952		cifs_tcon_dbg(VFS, "Encryption is requested but not supported\n");
1953
1954	init_copy_chunk_defaults(tcon);
1955	if (server->ops->validate_negotiate)
1956		rc = server->ops->validate_negotiate(xid, tcon);
1957tcon_exit:
1958
1959	free_rsp_buf(resp_buftype, rsp);
1960	kfree(unc_path);
1961	return rc;
1962
1963tcon_error_exit:
1964	if (rsp && rsp->hdr.Status == STATUS_BAD_NETWORK_NAME)
1965		cifs_tcon_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
 
1966	goto tcon_exit;
1967}
1968
1969int
1970SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
1971{
1972	struct smb_rqst rqst;
1973	struct smb2_tree_disconnect_req *req; /* response is trivial */
1974	int rc = 0;
1975	struct cifs_ses *ses = tcon->ses;
1976	int flags = 0;
1977	unsigned int total_len;
1978	struct kvec iov[1];
1979	struct kvec rsp_iov;
1980	int resp_buf_type;
1981
1982	cifs_dbg(FYI, "Tree Disconnect\n");
1983
1984	if (!ses || !(ses->server))
1985		return -EIO;
1986
1987	trace_smb3_tdis_enter(xid, tcon->tid, ses->Suid, tcon->tree_name);
1988	spin_lock(&ses->chan_lock);
1989	if ((tcon->need_reconnect) ||
1990	    (CIFS_ALL_CHANS_NEED_RECONNECT(tcon->ses))) {
1991		spin_unlock(&ses->chan_lock);
1992		return 0;
1993	}
1994	spin_unlock(&ses->chan_lock);
1995
1996	invalidate_all_cached_dirs(tcon);
1997
1998	rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, ses->server,
1999				 (void **) &req,
2000				 &total_len);
2001	if (rc)
2002		return rc;
2003
2004	if (smb3_encryption_required(tcon))
2005		flags |= CIFS_TRANSFORM_REQ;
2006
2007	flags |= CIFS_NO_RSP_BUF;
2008
2009	iov[0].iov_base = (char *)req;
2010	iov[0].iov_len = total_len;
2011
2012	memset(&rqst, 0, sizeof(struct smb_rqst));
2013	rqst.rq_iov = iov;
2014	rqst.rq_nvec = 1;
2015
2016	rc = cifs_send_recv(xid, ses, ses->server,
2017			    &rqst, &resp_buf_type, flags, &rsp_iov);
2018	cifs_small_buf_release(req);
2019	if (rc) {
2020		cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
2021		trace_smb3_tdis_err(xid, tcon->tid, ses->Suid, rc);
2022	}
2023	trace_smb3_tdis_done(xid, tcon->tid, ses->Suid);
2024
2025	return rc;
2026}
2027
2028
2029static struct create_durable *
2030create_durable_buf(void)
2031{
2032	struct create_durable *buf;
2033
2034	buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
2035	if (!buf)
2036		return NULL;
2037
2038	buf->ccontext.DataOffset = cpu_to_le16(offsetof
2039					(struct create_durable, Data));
2040	buf->ccontext.DataLength = cpu_to_le32(16);
2041	buf->ccontext.NameOffset = cpu_to_le16(offsetof
2042				(struct create_durable, Name));
2043	buf->ccontext.NameLength = cpu_to_le16(4);
2044	/* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
2045	buf->Name[0] = 'D';
2046	buf->Name[1] = 'H';
2047	buf->Name[2] = 'n';
2048	buf->Name[3] = 'Q';
2049	return buf;
2050}
2051
2052static struct create_durable *
2053create_reconnect_durable_buf(struct cifs_fid *fid)
2054{
2055	struct create_durable *buf;
2056
2057	buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
2058	if (!buf)
2059		return NULL;
2060
2061	buf->ccontext.DataOffset = cpu_to_le16(offsetof
2062					(struct create_durable, Data));
2063	buf->ccontext.DataLength = cpu_to_le32(16);
2064	buf->ccontext.NameOffset = cpu_to_le16(offsetof
2065				(struct create_durable, Name));
2066	buf->ccontext.NameLength = cpu_to_le16(4);
2067	buf->Data.Fid.PersistentFileId = fid->persistent_fid;
2068	buf->Data.Fid.VolatileFileId = fid->volatile_fid;
2069	/* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
2070	buf->Name[0] = 'D';
2071	buf->Name[1] = 'H';
2072	buf->Name[2] = 'n';
2073	buf->Name[3] = 'C';
2074	return buf;
2075}
2076
2077static void
2078parse_query_id_ctxt(struct create_context *cc, struct smb2_file_all_info *buf)
2079{
2080	struct create_on_disk_id *pdisk_id = (struct create_on_disk_id *)cc;
2081
2082	cifs_dbg(FYI, "parse query id context 0x%llx 0x%llx\n",
2083		pdisk_id->DiskFileId, pdisk_id->VolumeId);
2084	buf->IndexNumber = pdisk_id->DiskFileId;
2085}
2086
2087static void
2088parse_posix_ctxt(struct create_context *cc, struct smb2_file_all_info *info,
2089		 struct create_posix_rsp *posix)
2090{
2091	int sid_len;
2092	u8 *beg = (u8 *)cc + le16_to_cpu(cc->DataOffset);
2093	u8 *end = beg + le32_to_cpu(cc->DataLength);
2094	u8 *sid;
2095
2096	memset(posix, 0, sizeof(*posix));
2097
2098	posix->nlink = le32_to_cpu(*(__le32 *)(beg + 0));
2099	posix->reparse_tag = le32_to_cpu(*(__le32 *)(beg + 4));
2100	posix->mode = le32_to_cpu(*(__le32 *)(beg + 8));
2101
2102	sid = beg + 12;
2103	sid_len = posix_info_sid_size(sid, end);
2104	if (sid_len < 0) {
2105		cifs_dbg(VFS, "bad owner sid in posix create response\n");
2106		return;
2107	}
2108	memcpy(&posix->owner, sid, sid_len);
2109
2110	sid = sid + sid_len;
2111	sid_len = posix_info_sid_size(sid, end);
2112	if (sid_len < 0) {
2113		cifs_dbg(VFS, "bad group sid in posix create response\n");
2114		return;
2115	}
2116	memcpy(&posix->group, sid, sid_len);
2117
2118	cifs_dbg(FYI, "nlink=%d mode=%o reparse_tag=%x\n",
2119		 posix->nlink, posix->mode, posix->reparse_tag);
2120}
2121
2122void
2123smb2_parse_contexts(struct TCP_Server_Info *server,
2124		    struct smb2_create_rsp *rsp,
2125		    unsigned int *epoch, char *lease_key, __u8 *oplock,
2126		    struct smb2_file_all_info *buf,
2127		    struct create_posix_rsp *posix)
2128{
2129	char *data_offset;
2130	struct create_context *cc;
2131	unsigned int next;
2132	unsigned int remaining;
2133	char *name;
2134	static const char smb3_create_tag_posix[] = {
2135		0x93, 0xAD, 0x25, 0x50, 0x9C,
2136		0xB4, 0x11, 0xE7, 0xB4, 0x23, 0x83,
2137		0xDE, 0x96, 0x8B, 0xCD, 0x7C
2138	};
2139
2140	*oplock = 0;
2141	data_offset = (char *)rsp + le32_to_cpu(rsp->CreateContextsOffset);
2142	remaining = le32_to_cpu(rsp->CreateContextsLength);
2143	cc = (struct create_context *)data_offset;
2144
2145	/* Initialize inode number to 0 in case no valid data in qfid context */
2146	if (buf)
2147		buf->IndexNumber = 0;
2148
2149	while (remaining >= sizeof(struct create_context)) {
2150		name = le16_to_cpu(cc->NameOffset) + (char *)cc;
2151		if (le16_to_cpu(cc->NameLength) == 4 &&
2152		    strncmp(name, SMB2_CREATE_REQUEST_LEASE, 4) == 0)
2153			*oplock = server->ops->parse_lease_buf(cc, epoch,
2154							   lease_key);
2155		else if (buf && (le16_to_cpu(cc->NameLength) == 4) &&
2156		    strncmp(name, SMB2_CREATE_QUERY_ON_DISK_ID, 4) == 0)
2157			parse_query_id_ctxt(cc, buf);
2158		else if ((le16_to_cpu(cc->NameLength) == 16)) {
2159			if (posix &&
2160			    memcmp(name, smb3_create_tag_posix, 16) == 0)
2161				parse_posix_ctxt(cc, buf, posix);
2162		}
2163		/* else {
2164			cifs_dbg(FYI, "Context not matched with len %d\n",
2165				le16_to_cpu(cc->NameLength));
2166			cifs_dump_mem("Cctxt name: ", name, 4);
2167		} */
2168
2169		next = le32_to_cpu(cc->Next);
2170		if (!next)
2171			break;
2172		remaining -= next;
2173		cc = (struct create_context *)((char *)cc + next);
2174	}
2175
2176	if (rsp->OplockLevel != SMB2_OPLOCK_LEVEL_LEASE)
2177		*oplock = rsp->OplockLevel;
2178
2179	return;
2180}
2181
2182static int
2183add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
2184		  unsigned int *num_iovec, u8 *lease_key, __u8 *oplock)
2185{
2186	struct smb2_create_req *req = iov[0].iov_base;
2187	unsigned int num = *num_iovec;
2188
2189	iov[num].iov_base = server->ops->create_lease_buf(lease_key, *oplock);
2190	if (iov[num].iov_base == NULL)
2191		return -ENOMEM;
2192	iov[num].iov_len = server->vals->create_lease_size;
2193	req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
2194	if (!req->CreateContextsOffset)
2195		req->CreateContextsOffset = cpu_to_le32(
2196				sizeof(struct smb2_create_req) +
2197				iov[num - 1].iov_len);
2198	le32_add_cpu(&req->CreateContextsLength,
2199		     server->vals->create_lease_size);
2200	*num_iovec = num + 1;
2201	return 0;
2202}
2203
2204static struct create_durable_v2 *
2205create_durable_v2_buf(struct cifs_open_parms *oparms)
2206{
2207	struct cifs_fid *pfid = oparms->fid;
2208	struct create_durable_v2 *buf;
2209
2210	buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
2211	if (!buf)
2212		return NULL;
2213
2214	buf->ccontext.DataOffset = cpu_to_le16(offsetof
2215					(struct create_durable_v2, dcontext));
2216	buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
2217	buf->ccontext.NameOffset = cpu_to_le16(offsetof
2218				(struct create_durable_v2, Name));
2219	buf->ccontext.NameLength = cpu_to_le16(4);
2220
2221	/*
2222	 * NB: Handle timeout defaults to 0, which allows server to choose
2223	 * (most servers default to 120 seconds) and most clients default to 0.
2224	 * This can be overridden at mount ("handletimeout=") if the user wants
2225	 * a different persistent (or resilient) handle timeout for all opens
2226	 * opens on a particular SMB3 mount.
2227	 */
2228	buf->dcontext.Timeout = cpu_to_le32(oparms->tcon->handle_timeout);
2229	buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
2230	generate_random_uuid(buf->dcontext.CreateGuid);
2231	memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
2232
2233	/* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
2234	buf->Name[0] = 'D';
2235	buf->Name[1] = 'H';
2236	buf->Name[2] = '2';
2237	buf->Name[3] = 'Q';
2238	return buf;
2239}
2240
2241static struct create_durable_handle_reconnect_v2 *
2242create_reconnect_durable_v2_buf(struct cifs_fid *fid)
2243{
2244	struct create_durable_handle_reconnect_v2 *buf;
2245
2246	buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
2247			GFP_KERNEL);
2248	if (!buf)
2249		return NULL;
2250
2251	buf->ccontext.DataOffset =
2252		cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2253				     dcontext));
2254	buf->ccontext.DataLength =
2255		cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
2256	buf->ccontext.NameOffset =
2257		cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2258			    Name));
2259	buf->ccontext.NameLength = cpu_to_le16(4);
2260
2261	buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
2262	buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
2263	buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
2264	memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
2265
2266	/* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
2267	buf->Name[0] = 'D';
2268	buf->Name[1] = 'H';
2269	buf->Name[2] = '2';
2270	buf->Name[3] = 'C';
2271	return buf;
2272}
2273
2274static int
2275add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
2276		    struct cifs_open_parms *oparms)
2277{
2278	struct smb2_create_req *req = iov[0].iov_base;
2279	unsigned int num = *num_iovec;
2280
2281	iov[num].iov_base = create_durable_v2_buf(oparms);
2282	if (iov[num].iov_base == NULL)
2283		return -ENOMEM;
2284	iov[num].iov_len = sizeof(struct create_durable_v2);
2285	if (!req->CreateContextsOffset)
2286		req->CreateContextsOffset =
2287			cpu_to_le32(sizeof(struct smb2_create_req) +
2288								iov[1].iov_len);
2289	le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
2290	*num_iovec = num + 1;
2291	return 0;
2292}
2293
2294static int
2295add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
2296		    struct cifs_open_parms *oparms)
2297{
2298	struct smb2_create_req *req = iov[0].iov_base;
2299	unsigned int num = *num_iovec;
2300
2301	/* indicate that we don't need to relock the file */
2302	oparms->reconnect = false;
2303
2304	iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
2305	if (iov[num].iov_base == NULL)
2306		return -ENOMEM;
2307	iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
2308	if (!req->CreateContextsOffset)
2309		req->CreateContextsOffset =
2310			cpu_to_le32(sizeof(struct smb2_create_req) +
2311								iov[1].iov_len);
2312	le32_add_cpu(&req->CreateContextsLength,
2313			sizeof(struct create_durable_handle_reconnect_v2));
2314	*num_iovec = num + 1;
2315	return 0;
2316}
2317
2318static int
2319add_durable_context(struct kvec *iov, unsigned int *num_iovec,
2320		    struct cifs_open_parms *oparms, bool use_persistent)
2321{
2322	struct smb2_create_req *req = iov[0].iov_base;
2323	unsigned int num = *num_iovec;
2324
2325	if (use_persistent) {
2326		if (oparms->reconnect)
2327			return add_durable_reconnect_v2_context(iov, num_iovec,
2328								oparms);
2329		else
2330			return add_durable_v2_context(iov, num_iovec, oparms);
2331	}
2332
2333	if (oparms->reconnect) {
2334		iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
2335		/* indicate that we don't need to relock the file */
2336		oparms->reconnect = false;
2337	} else
2338		iov[num].iov_base = create_durable_buf();
2339	if (iov[num].iov_base == NULL)
2340		return -ENOMEM;
2341	iov[num].iov_len = sizeof(struct create_durable);
2342	if (!req->CreateContextsOffset)
2343		req->CreateContextsOffset =
2344			cpu_to_le32(sizeof(struct smb2_create_req) +
2345								iov[1].iov_len);
2346	le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
2347	*num_iovec = num + 1;
2348	return 0;
2349}
2350
2351/* See MS-SMB2 2.2.13.2.7 */
2352static struct crt_twarp_ctxt *
2353create_twarp_buf(__u64 timewarp)
2354{
2355	struct crt_twarp_ctxt *buf;
2356
2357	buf = kzalloc(sizeof(struct crt_twarp_ctxt), GFP_KERNEL);
2358	if (!buf)
2359		return NULL;
2360
2361	buf->ccontext.DataOffset = cpu_to_le16(offsetof
2362					(struct crt_twarp_ctxt, Timestamp));
2363	buf->ccontext.DataLength = cpu_to_le32(8);
2364	buf->ccontext.NameOffset = cpu_to_le16(offsetof
2365				(struct crt_twarp_ctxt, Name));
2366	buf->ccontext.NameLength = cpu_to_le16(4);
2367	/* SMB2_CREATE_TIMEWARP_TOKEN is "TWrp" */
2368	buf->Name[0] = 'T';
2369	buf->Name[1] = 'W';
2370	buf->Name[2] = 'r';
2371	buf->Name[3] = 'p';
2372	buf->Timestamp = cpu_to_le64(timewarp);
2373	return buf;
2374}
2375
2376/* See MS-SMB2 2.2.13.2.7 */
2377static int
2378add_twarp_context(struct kvec *iov, unsigned int *num_iovec, __u64 timewarp)
2379{
2380	struct smb2_create_req *req = iov[0].iov_base;
2381	unsigned int num = *num_iovec;
2382
2383	iov[num].iov_base = create_twarp_buf(timewarp);
2384	if (iov[num].iov_base == NULL)
2385		return -ENOMEM;
2386	iov[num].iov_len = sizeof(struct crt_twarp_ctxt);
2387	if (!req->CreateContextsOffset)
2388		req->CreateContextsOffset = cpu_to_le32(
2389				sizeof(struct smb2_create_req) +
2390				iov[num - 1].iov_len);
2391	le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_twarp_ctxt));
2392	*num_iovec = num + 1;
2393	return 0;
2394}
2395
2396/* See See http://technet.microsoft.com/en-us/library/hh509017(v=ws.10).aspx */
2397static void setup_owner_group_sids(char *buf)
2398{
2399	struct owner_group_sids *sids = (struct owner_group_sids *)buf;
2400
2401	/* Populate the user ownership fields S-1-5-88-1 */
2402	sids->owner.Revision = 1;
2403	sids->owner.NumAuth = 3;
2404	sids->owner.Authority[5] = 5;
2405	sids->owner.SubAuthorities[0] = cpu_to_le32(88);
2406	sids->owner.SubAuthorities[1] = cpu_to_le32(1);
2407	sids->owner.SubAuthorities[2] = cpu_to_le32(current_fsuid().val);
2408
2409	/* Populate the group ownership fields S-1-5-88-2 */
2410	sids->group.Revision = 1;
2411	sids->group.NumAuth = 3;
2412	sids->group.Authority[5] = 5;
2413	sids->group.SubAuthorities[0] = cpu_to_le32(88);
2414	sids->group.SubAuthorities[1] = cpu_to_le32(2);
2415	sids->group.SubAuthorities[2] = cpu_to_le32(current_fsgid().val);
2416
2417	cifs_dbg(FYI, "owner S-1-5-88-1-%d, group S-1-5-88-2-%d\n", current_fsuid().val, current_fsgid().val);
2418}
2419
2420/* See MS-SMB2 2.2.13.2.2 and MS-DTYP 2.4.6 */
2421static struct crt_sd_ctxt *
2422create_sd_buf(umode_t mode, bool set_owner, unsigned int *len)
2423{
2424	struct crt_sd_ctxt *buf;
2425	__u8 *ptr, *aclptr;
2426	unsigned int acelen, acl_size, ace_count;
2427	unsigned int owner_offset = 0;
2428	unsigned int group_offset = 0;
2429	struct smb3_acl acl = {};
2430
2431	*len = round_up(sizeof(struct crt_sd_ctxt) + (sizeof(struct cifs_ace) * 4), 8);
2432
2433	if (set_owner) {
 
 
 
2434		/* sizeof(struct owner_group_sids) is already multiple of 8 so no need to round */
2435		*len += sizeof(struct owner_group_sids);
2436	}
2437
2438	buf = kzalloc(*len, GFP_KERNEL);
2439	if (buf == NULL)
2440		return buf;
2441
2442	ptr = (__u8 *)&buf[1];
2443	if (set_owner) {
2444		/* offset fields are from beginning of security descriptor not of create context */
2445		owner_offset = ptr - (__u8 *)&buf->sd;
2446		buf->sd.OffsetOwner = cpu_to_le32(owner_offset);
2447		group_offset = owner_offset + offsetof(struct owner_group_sids, group);
2448		buf->sd.OffsetGroup = cpu_to_le32(group_offset);
2449
2450		setup_owner_group_sids(ptr);
2451		ptr += sizeof(struct owner_group_sids);
2452	} else {
2453		buf->sd.OffsetOwner = 0;
2454		buf->sd.OffsetGroup = 0;
2455	}
2456
2457	buf->ccontext.DataOffset = cpu_to_le16(offsetof(struct crt_sd_ctxt, sd));
 
 
 
 
 
 
 
 
 
 
2458	buf->ccontext.NameOffset = cpu_to_le16(offsetof(struct crt_sd_ctxt, Name));
2459	buf->ccontext.NameLength = cpu_to_le16(4);
2460	/* SMB2_CREATE_SD_BUFFER_TOKEN is "SecD" */
2461	buf->Name[0] = 'S';
2462	buf->Name[1] = 'e';
2463	buf->Name[2] = 'c';
2464	buf->Name[3] = 'D';
2465	buf->sd.Revision = 1;  /* Must be one see MS-DTYP 2.4.6 */
2466
2467	/*
2468	 * ACL is "self relative" ie ACL is stored in contiguous block of memory
2469	 * and "DP" ie the DACL is present
2470	 */
2471	buf->sd.Control = cpu_to_le16(ACL_CONTROL_SR | ACL_CONTROL_DP);
2472
2473	/* offset owner, group and Sbz1 and SACL are all zero */
2474	buf->sd.OffsetDacl = cpu_to_le32(ptr - (__u8 *)&buf->sd);
2475	/* Ship the ACL for now. we will copy it into buf later. */
2476	aclptr = ptr;
2477	ptr += sizeof(struct smb3_acl);
2478
2479	/* create one ACE to hold the mode embedded in reserved special SID */
2480	acelen = setup_special_mode_ACE((struct cifs_ace *)ptr, (__u64)mode);
2481	ptr += acelen;
2482	acl_size = acelen + sizeof(struct smb3_acl);
2483	ace_count = 1;
2484
2485	if (set_owner) {
2486		/* we do not need to reallocate buffer to add the two more ACEs. plenty of space */
2487		acelen = setup_special_user_owner_ACE((struct cifs_ace *)ptr);
2488		ptr += acelen;
2489		acl_size += acelen;
2490		ace_count += 1;
2491	}
 
2492
2493	/* and one more ACE to allow access for authenticated users */
2494	acelen = setup_authusers_ACE((struct cifs_ace *)ptr);
2495	ptr += acelen;
2496	acl_size += acelen;
2497	ace_count += 1;
2498
2499	acl.AclRevision = ACL_REVISION; /* See 2.4.4.1 of MS-DTYP */
2500	acl.AclSize = cpu_to_le16(acl_size);
2501	acl.AceCount = cpu_to_le16(ace_count);
2502	/* acl.Sbz1 and Sbz2 MBZ so are not set here, but initialized above */
2503	memcpy(aclptr, &acl, sizeof(struct smb3_acl));
2504
2505	buf->ccontext.DataLength = cpu_to_le32(ptr - (__u8 *)&buf->sd);
2506	*len = round_up((unsigned int)(ptr - (__u8 *)buf), 8);
2507
2508	return buf;
2509}
2510
2511static int
2512add_sd_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode, bool set_owner)
2513{
2514	struct smb2_create_req *req = iov[0].iov_base;
2515	unsigned int num = *num_iovec;
2516	unsigned int len = 0;
2517
2518	iov[num].iov_base = create_sd_buf(mode, set_owner, &len);
2519	if (iov[num].iov_base == NULL)
2520		return -ENOMEM;
2521	iov[num].iov_len = len;
2522	if (!req->CreateContextsOffset)
2523		req->CreateContextsOffset = cpu_to_le32(
2524				sizeof(struct smb2_create_req) +
2525				iov[num - 1].iov_len);
2526	le32_add_cpu(&req->CreateContextsLength, len);
2527	*num_iovec = num + 1;
2528	return 0;
2529}
2530
2531static struct crt_query_id_ctxt *
2532create_query_id_buf(void)
2533{
2534	struct crt_query_id_ctxt *buf;
2535
2536	buf = kzalloc(sizeof(struct crt_query_id_ctxt), GFP_KERNEL);
2537	if (!buf)
2538		return NULL;
2539
2540	buf->ccontext.DataOffset = cpu_to_le16(0);
2541	buf->ccontext.DataLength = cpu_to_le32(0);
2542	buf->ccontext.NameOffset = cpu_to_le16(offsetof
2543				(struct crt_query_id_ctxt, Name));
2544	buf->ccontext.NameLength = cpu_to_le16(4);
2545	/* SMB2_CREATE_QUERY_ON_DISK_ID is "QFid" */
2546	buf->Name[0] = 'Q';
2547	buf->Name[1] = 'F';
2548	buf->Name[2] = 'i';
2549	buf->Name[3] = 'd';
2550	return buf;
2551}
2552
2553/* See MS-SMB2 2.2.13.2.9 */
2554static int
2555add_query_id_context(struct kvec *iov, unsigned int *num_iovec)
2556{
2557	struct smb2_create_req *req = iov[0].iov_base;
2558	unsigned int num = *num_iovec;
2559
2560	iov[num].iov_base = create_query_id_buf();
2561	if (iov[num].iov_base == NULL)
2562		return -ENOMEM;
2563	iov[num].iov_len = sizeof(struct crt_query_id_ctxt);
2564	if (!req->CreateContextsOffset)
2565		req->CreateContextsOffset = cpu_to_le32(
2566				sizeof(struct smb2_create_req) +
2567				iov[num - 1].iov_len);
2568	le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_query_id_ctxt));
2569	*num_iovec = num + 1;
2570	return 0;
2571}
2572
2573static int
2574alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
2575			    const char *treename, const __le16 *path)
2576{
2577	int treename_len, path_len;
2578	struct nls_table *cp;
2579	const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
2580
2581	/*
2582	 * skip leading "\\"
2583	 */
2584	treename_len = strlen(treename);
2585	if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
2586		return -EINVAL;
2587
2588	treename += 2;
2589	treename_len -= 2;
2590
2591	path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
2592
2593	/* make room for one path separator only if @path isn't empty */
2594	*out_len = treename_len + (path[0] ? 1 : 0) + path_len;
 
 
 
2595
2596	/*
2597	 * final path needs to be 8-byte aligned as specified in
2598	 * MS-SMB2 2.2.13 SMB2 CREATE Request.
2599	 */
2600	*out_size = round_up(*out_len * sizeof(__le16), 8);
2601	*out_path = kzalloc(*out_size + sizeof(__le16) /* null */, GFP_KERNEL);
 
2602	if (!*out_path)
2603		return -ENOMEM;
2604
2605	cp = load_nls_default();
2606	cifs_strtoUTF16(*out_path, treename, treename_len, cp);
2607
2608	/* Do not append the separator if the path is empty */
2609	if (path[0] != cpu_to_le16(0x0000)) {
2610		UniStrcat(*out_path, sep);
2611		UniStrcat(*out_path, path);
2612	}
2613
2614	unload_nls(cp);
2615
2616	return 0;
2617}
2618
2619int smb311_posix_mkdir(const unsigned int xid, struct inode *inode,
2620			       umode_t mode, struct cifs_tcon *tcon,
2621			       const char *full_path,
2622			       struct cifs_sb_info *cifs_sb)
2623{
2624	struct smb_rqst rqst;
2625	struct smb2_create_req *req;
2626	struct smb2_create_rsp *rsp = NULL;
2627	struct cifs_ses *ses = tcon->ses;
2628	struct kvec iov[3]; /* make sure at least one for each open context */
2629	struct kvec rsp_iov = {NULL, 0};
2630	int resp_buftype;
2631	int uni_path_len;
2632	__le16 *copy_path = NULL;
2633	int copy_size;
2634	int rc = 0;
2635	unsigned int n_iov = 2;
2636	__u32 file_attributes = 0;
2637	char *pc_buf = NULL;
2638	int flags = 0;
2639	unsigned int total_len;
2640	__le16 *utf16_path = NULL;
2641	struct TCP_Server_Info *server = cifs_pick_channel(ses);
2642
2643	cifs_dbg(FYI, "mkdir\n");
2644
2645	/* resource #1: path allocation */
2646	utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
2647	if (!utf16_path)
2648		return -ENOMEM;
2649
2650	if (!ses || !server) {
2651		rc = -EIO;
2652		goto err_free_path;
2653	}
2654
2655	/* resource #2: request */
2656	rc = smb2_plain_req_init(SMB2_CREATE, tcon, server,
2657				 (void **) &req, &total_len);
2658	if (rc)
2659		goto err_free_path;
2660
2661
2662	if (smb3_encryption_required(tcon))
2663		flags |= CIFS_TRANSFORM_REQ;
2664
2665	req->ImpersonationLevel = IL_IMPERSONATION;
2666	req->DesiredAccess = cpu_to_le32(FILE_WRITE_ATTRIBUTES);
2667	/* File attributes ignored on open (used in create though) */
2668	req->FileAttributes = cpu_to_le32(file_attributes);
2669	req->ShareAccess = FILE_SHARE_ALL_LE;
2670	req->CreateDisposition = cpu_to_le32(FILE_CREATE);
2671	req->CreateOptions = cpu_to_le32(CREATE_NOT_FILE);
2672
2673	iov[0].iov_base = (char *)req;
2674	/* -1 since last byte is buf[0] which is sent below (path) */
2675	iov[0].iov_len = total_len - 1;
2676
2677	req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2678
2679	/* [MS-SMB2] 2.2.13 NameOffset:
2680	 * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2681	 * the SMB2 header, the file name includes a prefix that will
2682	 * be processed during DFS name normalization as specified in
2683	 * section 3.3.5.9. Otherwise, the file name is relative to
2684	 * the share that is identified by the TreeId in the SMB2
2685	 * header.
2686	 */
2687	if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2688		int name_len;
2689
2690		req->hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2691		rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2692						 &name_len,
2693						 tcon->tree_name, utf16_path);
2694		if (rc)
2695			goto err_free_req;
2696
2697		req->NameLength = cpu_to_le16(name_len * 2);
2698		uni_path_len = copy_size;
2699		/* free before overwriting resource */
2700		kfree(utf16_path);
2701		utf16_path = copy_path;
2702	} else {
2703		uni_path_len = (2 * UniStrnlen((wchar_t *)utf16_path, PATH_MAX)) + 2;
2704		/* MUST set path len (NameLength) to 0 opening root of share */
2705		req->NameLength = cpu_to_le16(uni_path_len - 2);
2706		if (uni_path_len % 8 != 0) {
2707			copy_size = roundup(uni_path_len, 8);
2708			copy_path = kzalloc(copy_size, GFP_KERNEL);
2709			if (!copy_path) {
2710				rc = -ENOMEM;
2711				goto err_free_req;
2712			}
2713			memcpy((char *)copy_path, (const char *)utf16_path,
2714			       uni_path_len);
2715			uni_path_len = copy_size;
2716			/* free before overwriting resource */
2717			kfree(utf16_path);
2718			utf16_path = copy_path;
2719		}
2720	}
2721
2722	iov[1].iov_len = uni_path_len;
2723	iov[1].iov_base = utf16_path;
2724	req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;
2725
2726	if (tcon->posix_extensions) {
2727		/* resource #3: posix buf */
2728		rc = add_posix_context(iov, &n_iov, mode);
2729		if (rc)
2730			goto err_free_req;
2731		pc_buf = iov[n_iov-1].iov_base;
2732	}
2733
2734
2735	memset(&rqst, 0, sizeof(struct smb_rqst));
2736	rqst.rq_iov = iov;
2737	rqst.rq_nvec = n_iov;
2738
2739	/* no need to inc num_remote_opens because we close it just below */
2740	trace_smb3_posix_mkdir_enter(xid, tcon->tid, ses->Suid, CREATE_NOT_FILE,
2741				    FILE_WRITE_ATTRIBUTES);
2742	/* resource #4: response buffer */
2743	rc = cifs_send_recv(xid, ses, server,
2744			    &rqst, &resp_buftype, flags, &rsp_iov);
2745	if (rc) {
2746		cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2747		trace_smb3_posix_mkdir_err(xid, tcon->tid, ses->Suid,
2748					   CREATE_NOT_FILE,
2749					   FILE_WRITE_ATTRIBUTES, rc);
2750		goto err_free_rsp_buf;
2751	}
2752
2753	/*
2754	 * Although unlikely to be possible for rsp to be null and rc not set,
2755	 * adding check below is slightly safer long term (and quiets Coverity
2756	 * warning)
2757	 */
2758	rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2759	if (rsp == NULL) {
2760		rc = -EIO;
2761		kfree(pc_buf);
2762		goto err_free_req;
2763	}
2764
2765	trace_smb3_posix_mkdir_done(xid, rsp->PersistentFileId, tcon->tid, ses->Suid,
2766				    CREATE_NOT_FILE, FILE_WRITE_ATTRIBUTES);
2767
2768	SMB2_close(xid, tcon, rsp->PersistentFileId, rsp->VolatileFileId);
2769
2770	/* Eventually save off posix specific response info and timestaps */
2771
2772err_free_rsp_buf:
2773	free_rsp_buf(resp_buftype, rsp);
2774	kfree(pc_buf);
2775err_free_req:
2776	cifs_small_buf_release(req);
2777err_free_path:
2778	kfree(utf16_path);
2779	return rc;
2780}
2781
2782int
2783SMB2_open_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
2784	       struct smb_rqst *rqst, __u8 *oplock,
2785	       struct cifs_open_parms *oparms, __le16 *path)
2786{
2787	struct smb2_create_req *req;
2788	unsigned int n_iov = 2;
2789	__u32 file_attributes = 0;
2790	int copy_size;
2791	int uni_path_len;
2792	unsigned int total_len;
2793	struct kvec *iov = rqst->rq_iov;
2794	__le16 *copy_path;
2795	int rc;
2796
2797	rc = smb2_plain_req_init(SMB2_CREATE, tcon, server,
2798				 (void **) &req, &total_len);
2799	if (rc)
2800		return rc;
2801
2802	iov[0].iov_base = (char *)req;
2803	/* -1 since last byte is buf[0] which is sent below (path) */
2804	iov[0].iov_len = total_len - 1;
2805
2806	if (oparms->create_options & CREATE_OPTION_READONLY)
2807		file_attributes |= ATTR_READONLY;
2808	if (oparms->create_options & CREATE_OPTION_SPECIAL)
2809		file_attributes |= ATTR_SYSTEM;
2810
2811	req->ImpersonationLevel = IL_IMPERSONATION;
2812	req->DesiredAccess = cpu_to_le32(oparms->desired_access);
2813	/* File attributes ignored on open (used in create though) */
2814	req->FileAttributes = cpu_to_le32(file_attributes);
2815	req->ShareAccess = FILE_SHARE_ALL_LE;
2816
2817	req->CreateDisposition = cpu_to_le32(oparms->disposition);
2818	req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
2819	req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2820
2821	/* [MS-SMB2] 2.2.13 NameOffset:
2822	 * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2823	 * the SMB2 header, the file name includes a prefix that will
2824	 * be processed during DFS name normalization as specified in
2825	 * section 3.3.5.9. Otherwise, the file name is relative to
2826	 * the share that is identified by the TreeId in the SMB2
2827	 * header.
2828	 */
2829	if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2830		int name_len;
2831
2832		req->hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2833		rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2834						 &name_len,
2835						 tcon->tree_name, path);
2836		if (rc)
2837			return rc;
2838		req->NameLength = cpu_to_le16(name_len * 2);
2839		uni_path_len = copy_size;
2840		path = copy_path;
2841	} else {
2842		uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
2843		/* MUST set path len (NameLength) to 0 opening root of share */
2844		req->NameLength = cpu_to_le16(uni_path_len - 2);
2845		copy_size = round_up(uni_path_len, 8);
 
 
2846		copy_path = kzalloc(copy_size, GFP_KERNEL);
2847		if (!copy_path)
2848			return -ENOMEM;
2849		memcpy((char *)copy_path, (const char *)path,
2850		       uni_path_len);
2851		uni_path_len = copy_size;
2852		path = copy_path;
2853	}
2854
2855	iov[1].iov_len = uni_path_len;
2856	iov[1].iov_base = path;
2857
2858	if ((!server->oplocks) || (tcon->no_lease))
2859		*oplock = SMB2_OPLOCK_LEVEL_NONE;
2860
2861	if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
2862	    *oplock == SMB2_OPLOCK_LEVEL_NONE)
2863		req->RequestedOplockLevel = *oplock;
2864	else if (!(server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING) &&
2865		  (oparms->create_options & CREATE_NOT_FILE))
2866		req->RequestedOplockLevel = *oplock; /* no srv lease support */
2867	else {
2868		rc = add_lease_context(server, iov, &n_iov,
2869				       oparms->fid->lease_key, oplock);
2870		if (rc)
2871			return rc;
2872	}
2873
2874	if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
2875		/* need to set Next field of lease context if we request it */
2876		if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
2877			struct create_context *ccontext =
2878			    (struct create_context *)iov[n_iov-1].iov_base;
2879			ccontext->Next =
2880				cpu_to_le32(server->vals->create_lease_size);
2881		}
2882
2883		rc = add_durable_context(iov, &n_iov, oparms,
2884					tcon->use_persistent);
2885		if (rc)
2886			return rc;
2887	}
2888
2889	if (tcon->posix_extensions) {
2890		if (n_iov > 2) {
2891			struct create_context *ccontext =
2892			    (struct create_context *)iov[n_iov-1].iov_base;
2893			ccontext->Next =
2894				cpu_to_le32(iov[n_iov-1].iov_len);
2895		}
2896
2897		rc = add_posix_context(iov, &n_iov, oparms->mode);
2898		if (rc)
2899			return rc;
2900	}
2901
2902	if (tcon->snapshot_time) {
2903		cifs_dbg(FYI, "adding snapshot context\n");
2904		if (n_iov > 2) {
2905			struct create_context *ccontext =
2906			    (struct create_context *)iov[n_iov-1].iov_base;
2907			ccontext->Next =
2908				cpu_to_le32(iov[n_iov-1].iov_len);
2909		}
2910
2911		rc = add_twarp_context(iov, &n_iov, tcon->snapshot_time);
2912		if (rc)
2913			return rc;
2914	}
2915
2916	if ((oparms->disposition != FILE_OPEN) && (oparms->cifs_sb)) {
2917		bool set_mode;
2918		bool set_owner;
2919
2920		if ((oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID) &&
2921		    (oparms->mode != ACL_NO_MODE))
2922			set_mode = true;
2923		else {
2924			set_mode = false;
2925			oparms->mode = ACL_NO_MODE;
2926		}
2927
2928		if (oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
2929			set_owner = true;
2930		else
2931			set_owner = false;
2932
2933		if (set_owner | set_mode) {
2934			if (n_iov > 2) {
2935				struct create_context *ccontext =
2936				    (struct create_context *)iov[n_iov-1].iov_base;
2937				ccontext->Next = cpu_to_le32(iov[n_iov-1].iov_len);
2938			}
2939
2940			cifs_dbg(FYI, "add sd with mode 0x%x\n", oparms->mode);
2941			rc = add_sd_context(iov, &n_iov, oparms->mode, set_owner);
2942			if (rc)
2943				return rc;
2944		}
2945	}
2946
2947	if (n_iov > 2) {
2948		struct create_context *ccontext =
2949			(struct create_context *)iov[n_iov-1].iov_base;
2950		ccontext->Next = cpu_to_le32(iov[n_iov-1].iov_len);
2951	}
2952	add_query_id_context(iov, &n_iov);
2953
2954	rqst->rq_nvec = n_iov;
2955	return 0;
2956}
2957
2958/* rq_iov[0] is the request and is released by cifs_small_buf_release().
2959 * All other vectors are freed by kfree().
2960 */
2961void
2962SMB2_open_free(struct smb_rqst *rqst)
2963{
2964	int i;
2965
2966	if (rqst && rqst->rq_iov) {
2967		cifs_small_buf_release(rqst->rq_iov[0].iov_base);
2968		for (i = 1; i < rqst->rq_nvec; i++)
2969			if (rqst->rq_iov[i].iov_base != smb2_padding)
2970				kfree(rqst->rq_iov[i].iov_base);
2971	}
2972}
2973
2974int
2975SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
2976	  __u8 *oplock, struct smb2_file_all_info *buf,
2977	  struct create_posix_rsp *posix,
2978	  struct kvec *err_iov, int *buftype)
2979{
2980	struct smb_rqst rqst;
2981	struct smb2_create_rsp *rsp = NULL;
2982	struct cifs_tcon *tcon = oparms->tcon;
2983	struct cifs_ses *ses = tcon->ses;
2984	struct TCP_Server_Info *server = cifs_pick_channel(ses);
2985	struct kvec iov[SMB2_CREATE_IOV_SIZE];
2986	struct kvec rsp_iov = {NULL, 0};
2987	int resp_buftype = CIFS_NO_BUFFER;
2988	int rc = 0;
2989	int flags = 0;
2990
2991	cifs_dbg(FYI, "create/open\n");
2992	if (!ses || !server)
2993		return -EIO;
2994
2995	if (smb3_encryption_required(tcon))
2996		flags |= CIFS_TRANSFORM_REQ;
2997
2998	memset(&rqst, 0, sizeof(struct smb_rqst));
2999	memset(&iov, 0, sizeof(iov));
3000	rqst.rq_iov = iov;
3001	rqst.rq_nvec = SMB2_CREATE_IOV_SIZE;
3002
3003	rc = SMB2_open_init(tcon, server,
3004			    &rqst, oplock, oparms, path);
3005	if (rc)
3006		goto creat_exit;
3007
3008	trace_smb3_open_enter(xid, tcon->tid, tcon->ses->Suid,
3009		oparms->create_options, oparms->desired_access);
3010
3011	rc = cifs_send_recv(xid, ses, server,
3012			    &rqst, &resp_buftype, flags,
3013			    &rsp_iov);
3014	rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
3015
3016	if (rc != 0) {
3017		cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
3018		if (err_iov && rsp) {
3019			*err_iov = rsp_iov;
3020			*buftype = resp_buftype;
3021			resp_buftype = CIFS_NO_BUFFER;
3022			rsp = NULL;
3023		}
3024		trace_smb3_open_err(xid, tcon->tid, ses->Suid,
3025				    oparms->create_options, oparms->desired_access, rc);
3026		if (rc == -EREMCHG) {
3027			pr_warn_once("server share %s deleted\n",
3028				     tcon->tree_name);
3029			tcon->need_reconnect = true;
3030		}
3031		goto creat_exit;
3032	} else if (rsp == NULL) /* unlikely to happen, but safer to check */
3033		goto creat_exit;
3034	else
3035		trace_smb3_open_done(xid, rsp->PersistentFileId, tcon->tid, ses->Suid,
3036				     oparms->create_options, oparms->desired_access);
3037
3038	atomic_inc(&tcon->num_remote_opens);
3039	oparms->fid->persistent_fid = rsp->PersistentFileId;
3040	oparms->fid->volatile_fid = rsp->VolatileFileId;
3041	oparms->fid->access = oparms->desired_access;
3042#ifdef CONFIG_CIFS_DEBUG2
3043	oparms->fid->mid = le64_to_cpu(rsp->hdr.MessageId);
3044#endif /* CIFS_DEBUG2 */
3045
3046	if (buf) {
3047		buf->CreationTime = rsp->CreationTime;
3048		buf->LastAccessTime = rsp->LastAccessTime;
3049		buf->LastWriteTime = rsp->LastWriteTime;
3050		buf->ChangeTime = rsp->ChangeTime;
3051		buf->AllocationSize = rsp->AllocationSize;
3052		buf->EndOfFile = rsp->EndofFile;
3053		buf->Attributes = rsp->FileAttributes;
3054		buf->NumberOfLinks = cpu_to_le32(1);
3055		buf->DeletePending = 0;
3056	}
3057
3058
3059	smb2_parse_contexts(server, rsp, &oparms->fid->epoch,
3060			    oparms->fid->lease_key, oplock, buf, posix);
3061creat_exit:
3062	SMB2_open_free(&rqst);
3063	free_rsp_buf(resp_buftype, rsp);
3064	return rc;
3065}
3066
3067int
3068SMB2_ioctl_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3069		struct smb_rqst *rqst,
3070		u64 persistent_fid, u64 volatile_fid, u32 opcode,
3071		char *in_data, u32 indatalen,
3072		__u32 max_response_size)
3073{
3074	struct smb2_ioctl_req *req;
3075	struct kvec *iov = rqst->rq_iov;
3076	unsigned int total_len;
3077	int rc;
3078	char *in_data_buf;
3079
3080	rc = smb2_ioctl_req_init(opcode, tcon, server,
3081				 (void **) &req, &total_len);
3082	if (rc)
3083		return rc;
3084
3085	if (indatalen) {
3086		/*
3087		 * indatalen is usually small at a couple of bytes max, so
3088		 * just allocate through generic pool
3089		 */
3090		in_data_buf = kmemdup(in_data, indatalen, GFP_NOFS);
3091		if (!in_data_buf) {
3092			cifs_small_buf_release(req);
3093			return -ENOMEM;
3094		}
3095	}
3096
3097	req->CtlCode = cpu_to_le32(opcode);
3098	req->PersistentFileId = persistent_fid;
3099	req->VolatileFileId = volatile_fid;
3100
3101	iov[0].iov_base = (char *)req;
3102	/*
3103	 * If no input data, the size of ioctl struct in
3104	 * protocol spec still includes a 1 byte data buffer,
3105	 * but if input data passed to ioctl, we do not
3106	 * want to double count this, so we do not send
3107	 * the dummy one byte of data in iovec[0] if sending
3108	 * input data (in iovec[1]).
3109	 */
3110	if (indatalen) {
3111		req->InputCount = cpu_to_le32(indatalen);
3112		/* do not set InputOffset if no input data */
3113		req->InputOffset =
3114		       cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer));
3115		rqst->rq_nvec = 2;
3116		iov[0].iov_len = total_len - 1;
3117		iov[1].iov_base = in_data_buf;
3118		iov[1].iov_len = indatalen;
3119	} else {
3120		rqst->rq_nvec = 1;
3121		iov[0].iov_len = total_len;
3122	}
3123
3124	req->OutputOffset = 0;
3125	req->OutputCount = 0; /* MBZ */
3126
3127	/*
3128	 * In most cases max_response_size is set to 16K (CIFSMaxBufSize)
3129	 * We Could increase default MaxOutputResponse, but that could require
3130	 * more credits. Windows typically sets this smaller, but for some
3131	 * ioctls it may be useful to allow server to send more. No point
3132	 * limiting what the server can send as long as fits in one credit
3133	 * We can not handle more than CIFS_MAX_BUF_SIZE yet but may want
3134	 * to increase this limit up in the future.
3135	 * Note that for snapshot queries that servers like Azure expect that
3136	 * the first query be minimal size (and just used to get the number/size
3137	 * of previous versions) so response size must be specified as EXACTLY
3138	 * sizeof(struct snapshot_array) which is 16 when rounded up to multiple
3139	 * of eight bytes.  Currently that is the only case where we set max
3140	 * response size smaller.
3141	 */
3142	req->MaxOutputResponse = cpu_to_le32(max_response_size);
3143	req->hdr.CreditCharge =
3144		cpu_to_le16(DIV_ROUND_UP(max(indatalen, max_response_size),
3145					 SMB2_MAX_BUFFER_SIZE));
3146	/* always an FSCTL (for now) */
3147	req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
 
 
3148
3149	/* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
3150	if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
3151		req->hdr.Flags |= SMB2_FLAGS_SIGNED;
3152
3153	return 0;
3154}
3155
3156void
3157SMB2_ioctl_free(struct smb_rqst *rqst)
3158{
3159	int i;
3160	if (rqst && rqst->rq_iov) {
3161		cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3162		for (i = 1; i < rqst->rq_nvec; i++)
3163			if (rqst->rq_iov[i].iov_base != smb2_padding)
3164				kfree(rqst->rq_iov[i].iov_base);
3165	}
3166}
3167
3168
3169/*
3170 *	SMB2 IOCTL is used for both IOCTLs and FSCTLs
3171 */
3172int
3173SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3174	   u64 volatile_fid, u32 opcode, char *in_data, u32 indatalen,
3175	   u32 max_out_data_len, char **out_data,
3176	   u32 *plen /* returned data len */)
3177{
3178	struct smb_rqst rqst;
3179	struct smb2_ioctl_rsp *rsp = NULL;
3180	struct cifs_ses *ses;
3181	struct TCP_Server_Info *server;
3182	struct kvec iov[SMB2_IOCTL_IOV_SIZE];
3183	struct kvec rsp_iov = {NULL, 0};
3184	int resp_buftype = CIFS_NO_BUFFER;
3185	int rc = 0;
3186	int flags = 0;
3187
3188	cifs_dbg(FYI, "SMB2 IOCTL\n");
3189
3190	if (out_data != NULL)
3191		*out_data = NULL;
3192
3193	/* zero out returned data len, in case of error */
3194	if (plen)
3195		*plen = 0;
3196
3197	if (!tcon)
3198		return -EIO;
3199
3200	ses = tcon->ses;
3201	if (!ses)
3202		return -EIO;
3203
3204	server = cifs_pick_channel(ses);
3205	if (!server)
3206		return -EIO;
3207
3208	if (smb3_encryption_required(tcon))
3209		flags |= CIFS_TRANSFORM_REQ;
3210
3211	memset(&rqst, 0, sizeof(struct smb_rqst));
3212	memset(&iov, 0, sizeof(iov));
3213	rqst.rq_iov = iov;
3214	rqst.rq_nvec = SMB2_IOCTL_IOV_SIZE;
3215
3216	rc = SMB2_ioctl_init(tcon, server,
3217			     &rqst, persistent_fid, volatile_fid, opcode,
3218			     in_data, indatalen, max_out_data_len);
3219	if (rc)
3220		goto ioctl_exit;
3221
3222	rc = cifs_send_recv(xid, ses, server,
3223			    &rqst, &resp_buftype, flags,
3224			    &rsp_iov);
3225	rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
3226
3227	if (rc != 0)
3228		trace_smb3_fsctl_err(xid, persistent_fid, tcon->tid,
3229				ses->Suid, 0, opcode, rc);
3230
3231	if ((rc != 0) && (rc != -EINVAL) && (rc != -E2BIG)) {
3232		cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3233		goto ioctl_exit;
3234	} else if (rc == -EINVAL) {
3235		if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
3236		    (opcode != FSCTL_SRV_COPYCHUNK)) {
3237			cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3238			goto ioctl_exit;
3239		}
3240	} else if (rc == -E2BIG) {
3241		if (opcode != FSCTL_QUERY_ALLOCATED_RANGES) {
3242			cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3243			goto ioctl_exit;
3244		}
3245	}
3246
3247	/* check if caller wants to look at return data or just return rc */
3248	if ((plen == NULL) || (out_data == NULL))
3249		goto ioctl_exit;
3250
3251	/*
3252	 * Although unlikely to be possible for rsp to be null and rc not set,
3253	 * adding check below is slightly safer long term (and quiets Coverity
3254	 * warning)
3255	 */
3256	if (rsp == NULL) {
3257		rc = -EIO;
3258		goto ioctl_exit;
3259	}
3260
3261	*plen = le32_to_cpu(rsp->OutputCount);
3262
3263	/* We check for obvious errors in the output buffer length and offset */
3264	if (*plen == 0)
3265		goto ioctl_exit; /* server returned no data */
3266	else if (*plen > rsp_iov.iov_len || *plen > 0xFF00) {
3267		cifs_tcon_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
3268		*plen = 0;
3269		rc = -EIO;
3270		goto ioctl_exit;
3271	}
3272
3273	if (rsp_iov.iov_len - *plen < le32_to_cpu(rsp->OutputOffset)) {
3274		cifs_tcon_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
3275			le32_to_cpu(rsp->OutputOffset));
3276		*plen = 0;
3277		rc = -EIO;
3278		goto ioctl_exit;
3279	}
3280
3281	*out_data = kmemdup((char *)rsp + le32_to_cpu(rsp->OutputOffset),
3282			    *plen, GFP_KERNEL);
3283	if (*out_data == NULL) {
3284		rc = -ENOMEM;
3285		goto ioctl_exit;
3286	}
3287
3288ioctl_exit:
3289	SMB2_ioctl_free(&rqst);
3290	free_rsp_buf(resp_buftype, rsp);
3291	return rc;
3292}
3293
3294/*
3295 *   Individual callers to ioctl worker function follow
3296 */
3297
3298int
3299SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
3300		     u64 persistent_fid, u64 volatile_fid)
3301{
3302	int rc;
3303	struct  compress_ioctl fsctl_input;
3304	char *ret_data = NULL;
3305
3306	fsctl_input.CompressionState =
3307			cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
3308
3309	rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
3310			FSCTL_SET_COMPRESSION,
3311			(char *)&fsctl_input /* data input */,
3312			2 /* in data len */, CIFSMaxBufSize /* max out data */,
3313			&ret_data /* out data */, NULL);
3314
3315	cifs_dbg(FYI, "set compression rc %d\n", rc);
3316
3317	return rc;
3318}
3319
3320int
3321SMB2_close_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3322		struct smb_rqst *rqst,
3323		u64 persistent_fid, u64 volatile_fid, bool query_attrs)
3324{
3325	struct smb2_close_req *req;
3326	struct kvec *iov = rqst->rq_iov;
3327	unsigned int total_len;
3328	int rc;
3329
3330	rc = smb2_plain_req_init(SMB2_CLOSE, tcon, server,
3331				 (void **) &req, &total_len);
3332	if (rc)
3333		return rc;
3334
3335	req->PersistentFileId = persistent_fid;
3336	req->VolatileFileId = volatile_fid;
3337	if (query_attrs)
3338		req->Flags = SMB2_CLOSE_FLAG_POSTQUERY_ATTRIB;
3339	else
3340		req->Flags = 0;
3341	iov[0].iov_base = (char *)req;
3342	iov[0].iov_len = total_len;
3343
3344	return 0;
3345}
3346
3347void
3348SMB2_close_free(struct smb_rqst *rqst)
3349{
3350	if (rqst && rqst->rq_iov)
3351		cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3352}
3353
3354int
3355__SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
3356	     u64 persistent_fid, u64 volatile_fid,
3357	     struct smb2_file_network_open_info *pbuf)
3358{
3359	struct smb_rqst rqst;
3360	struct smb2_close_rsp *rsp = NULL;
3361	struct cifs_ses *ses = tcon->ses;
3362	struct TCP_Server_Info *server = cifs_pick_channel(ses);
3363	struct kvec iov[1];
3364	struct kvec rsp_iov;
3365	int resp_buftype = CIFS_NO_BUFFER;
3366	int rc = 0;
3367	int flags = 0;
3368	bool query_attrs = false;
3369
3370	cifs_dbg(FYI, "Close\n");
3371
3372	if (!ses || !server)
3373		return -EIO;
3374
3375	if (smb3_encryption_required(tcon))
3376		flags |= CIFS_TRANSFORM_REQ;
3377
3378	memset(&rqst, 0, sizeof(struct smb_rqst));
3379	memset(&iov, 0, sizeof(iov));
3380	rqst.rq_iov = iov;
3381	rqst.rq_nvec = 1;
3382
3383	/* check if need to ask server to return timestamps in close response */
3384	if (pbuf)
3385		query_attrs = true;
3386
3387	trace_smb3_close_enter(xid, persistent_fid, tcon->tid, ses->Suid);
3388	rc = SMB2_close_init(tcon, server,
3389			     &rqst, persistent_fid, volatile_fid,
3390			     query_attrs);
3391	if (rc)
3392		goto close_exit;
3393
3394	rc = cifs_send_recv(xid, ses, server,
3395			    &rqst, &resp_buftype, flags, &rsp_iov);
3396	rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
3397
3398	if (rc != 0) {
3399		cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
3400		trace_smb3_close_err(xid, persistent_fid, tcon->tid, ses->Suid,
3401				     rc);
3402		goto close_exit;
3403	} else {
3404		trace_smb3_close_done(xid, persistent_fid, tcon->tid,
3405				      ses->Suid);
3406		/*
3407		 * Note that have to subtract 4 since struct network_open_info
3408		 * has a final 4 byte pad that close response does not have
3409		 */
3410		if (pbuf)
3411			memcpy(pbuf, (char *)&rsp->CreationTime, sizeof(*pbuf) - 4);
3412	}
3413
3414	atomic_dec(&tcon->num_remote_opens);
3415close_exit:
3416	SMB2_close_free(&rqst);
3417	free_rsp_buf(resp_buftype, rsp);
3418
3419	/* retry close in a worker thread if this one is interrupted */
3420	if (is_interrupt_error(rc)) {
3421		int tmp_rc;
3422
3423		tmp_rc = smb2_handle_cancelled_close(tcon, persistent_fid,
3424						     volatile_fid);
3425		if (tmp_rc)
3426			cifs_dbg(VFS, "handle cancelled close fid 0x%llx returned error %d\n",
3427				 persistent_fid, tmp_rc);
3428	}
3429	return rc;
3430}
3431
3432int
3433SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
3434		u64 persistent_fid, u64 volatile_fid)
3435{
3436	return __SMB2_close(xid, tcon, persistent_fid, volatile_fid, NULL);
3437}
3438
3439int
3440smb2_validate_iov(unsigned int offset, unsigned int buffer_length,
3441		  struct kvec *iov, unsigned int min_buf_size)
3442{
3443	unsigned int smb_len = iov->iov_len;
3444	char *end_of_smb = smb_len + (char *)iov->iov_base;
3445	char *begin_of_buf = offset + (char *)iov->iov_base;
3446	char *end_of_buf = begin_of_buf + buffer_length;
3447
3448
3449	if (buffer_length < min_buf_size) {
3450		cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
3451			 buffer_length, min_buf_size);
3452		return -EINVAL;
3453	}
3454
3455	/* check if beyond RFC1001 maximum length */
3456	if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
3457		cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
3458			 buffer_length, smb_len);
3459		return -EINVAL;
3460	}
3461
3462	if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
3463		cifs_dbg(VFS, "Invalid server response, bad offset to data\n");
3464		return -EINVAL;
3465	}
3466
3467	return 0;
3468}
3469
3470/*
3471 * If SMB buffer fields are valid, copy into temporary buffer to hold result.
3472 * Caller must free buffer.
3473 */
3474int
3475smb2_validate_and_copy_iov(unsigned int offset, unsigned int buffer_length,
3476			   struct kvec *iov, unsigned int minbufsize,
3477			   char *data)
3478{
3479	char *begin_of_buf = offset + (char *)iov->iov_base;
3480	int rc;
3481
3482	if (!data)
3483		return -EINVAL;
3484
3485	rc = smb2_validate_iov(offset, buffer_length, iov, minbufsize);
3486	if (rc)
3487		return rc;
3488
3489	memcpy(data, begin_of_buf, minbufsize);
3490
3491	return 0;
3492}
3493
3494int
3495SMB2_query_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3496		     struct smb_rqst *rqst,
3497		     u64 persistent_fid, u64 volatile_fid,
3498		     u8 info_class, u8 info_type, u32 additional_info,
3499		     size_t output_len, size_t input_len, void *input)
3500{
3501	struct smb2_query_info_req *req;
3502	struct kvec *iov = rqst->rq_iov;
3503	unsigned int total_len;
3504	int rc;
3505
3506	rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server,
3507				 (void **) &req, &total_len);
3508	if (rc)
3509		return rc;
3510
3511	req->InfoType = info_type;
3512	req->FileInfoClass = info_class;
3513	req->PersistentFileId = persistent_fid;
3514	req->VolatileFileId = volatile_fid;
3515	req->AdditionalInformation = cpu_to_le32(additional_info);
3516
3517	req->OutputBufferLength = cpu_to_le32(output_len);
3518	if (input_len) {
3519		req->InputBufferLength = cpu_to_le32(input_len);
3520		/* total_len for smb query request never close to le16 max */
3521		req->InputBufferOffset = cpu_to_le16(total_len - 1);
3522		memcpy(req->Buffer, input, input_len);
3523	}
3524
3525	iov[0].iov_base = (char *)req;
3526	/* 1 for Buffer */
3527	iov[0].iov_len = total_len - 1 + input_len;
3528	return 0;
3529}
3530
3531void
3532SMB2_query_info_free(struct smb_rqst *rqst)
3533{
3534	if (rqst && rqst->rq_iov)
3535		cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3536}
3537
3538static int
3539query_info(const unsigned int xid, struct cifs_tcon *tcon,
3540	   u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,
3541	   u32 additional_info, size_t output_len, size_t min_len, void **data,
3542		u32 *dlen)
3543{
3544	struct smb_rqst rqst;
3545	struct smb2_query_info_rsp *rsp = NULL;
3546	struct kvec iov[1];
3547	struct kvec rsp_iov;
3548	int rc = 0;
3549	int resp_buftype = CIFS_NO_BUFFER;
3550	struct cifs_ses *ses = tcon->ses;
3551	struct TCP_Server_Info *server;
3552	int flags = 0;
3553	bool allocated = false;
3554
3555	cifs_dbg(FYI, "Query Info\n");
3556
3557	if (!ses)
3558		return -EIO;
3559	server = cifs_pick_channel(ses);
3560	if (!server)
3561		return -EIO;
3562
3563	if (smb3_encryption_required(tcon))
3564		flags |= CIFS_TRANSFORM_REQ;
3565
3566	memset(&rqst, 0, sizeof(struct smb_rqst));
3567	memset(&iov, 0, sizeof(iov));
3568	rqst.rq_iov = iov;
3569	rqst.rq_nvec = 1;
3570
3571	rc = SMB2_query_info_init(tcon, server,
3572				  &rqst, persistent_fid, volatile_fid,
3573				  info_class, info_type, additional_info,
3574				  output_len, 0, NULL);
3575	if (rc)
3576		goto qinf_exit;
3577
3578	trace_smb3_query_info_enter(xid, persistent_fid, tcon->tid,
3579				    ses->Suid, info_class, (__u32)info_type);
3580
3581	rc = cifs_send_recv(xid, ses, server,
3582			    &rqst, &resp_buftype, flags, &rsp_iov);
3583	rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3584
3585	if (rc) {
3586		cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3587		trace_smb3_query_info_err(xid, persistent_fid, tcon->tid,
3588				ses->Suid, info_class, (__u32)info_type, rc);
3589		goto qinf_exit;
3590	}
3591
3592	trace_smb3_query_info_done(xid, persistent_fid, tcon->tid,
3593				ses->Suid, info_class, (__u32)info_type);
3594
3595	if (dlen) {
3596		*dlen = le32_to_cpu(rsp->OutputBufferLength);
3597		if (!*data) {
3598			*data = kmalloc(*dlen, GFP_KERNEL);
3599			if (!*data) {
3600				cifs_tcon_dbg(VFS,
3601					"Error %d allocating memory for acl\n",
3602					rc);
3603				*dlen = 0;
3604				rc = -ENOMEM;
3605				goto qinf_exit;
3606			}
3607			allocated = true;
3608		}
3609	}
3610
3611	rc = smb2_validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset),
3612					le32_to_cpu(rsp->OutputBufferLength),
3613					&rsp_iov, dlen ? *dlen : min_len, *data);
3614	if (rc && allocated) {
3615		kfree(*data);
3616		*data = NULL;
3617		*dlen = 0;
3618	}
3619
3620qinf_exit:
3621	SMB2_query_info_free(&rqst);
3622	free_rsp_buf(resp_buftype, rsp);
3623	return rc;
3624}
3625
3626int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
3627	u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
3628{
3629	return query_info(xid, tcon, persistent_fid, volatile_fid,
3630			  FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,
3631			  sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
3632			  sizeof(struct smb2_file_all_info), (void **)&data,
3633			  NULL);
3634}
3635
3636#if 0
3637/* currently unused, as now we are doing compounding instead (see smb311_posix_query_path_info) */
3638int
3639SMB311_posix_query_info(const unsigned int xid, struct cifs_tcon *tcon,
3640		u64 persistent_fid, u64 volatile_fid, struct smb311_posix_qinfo *data, u32 *plen)
3641{
3642	size_t output_len = sizeof(struct smb311_posix_qinfo *) +
3643			(sizeof(struct cifs_sid) * 2) + (PATH_MAX * 2);
3644	*plen = 0;
3645
3646	return query_info(xid, tcon, persistent_fid, volatile_fid,
3647			  SMB_FIND_FILE_POSIX_INFO, SMB2_O_INFO_FILE, 0,
3648			  output_len, sizeof(struct smb311_posix_qinfo), (void **)&data, plen);
3649	/* Note caller must free "data" (passed in above). It may be allocated in query_info call */
3650}
3651#endif
3652
3653int
3654SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
3655	       u64 persistent_fid, u64 volatile_fid,
3656	       void **data, u32 *plen, u32 extra_info)
3657{
3658	__u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO |
3659				extra_info;
3660	*plen = 0;
3661
3662	return query_info(xid, tcon, persistent_fid, volatile_fid,
3663			  0, SMB2_O_INFO_SECURITY, additional_info,
3664			  SMB2_MAX_BUFFER_SIZE, MIN_SEC_DESC_LEN, data, plen);
3665}
3666
3667int
3668SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
3669		 u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
3670{
3671	return query_info(xid, tcon, persistent_fid, volatile_fid,
3672			  FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
3673			  sizeof(struct smb2_file_internal_info),
3674			  sizeof(struct smb2_file_internal_info),
3675			  (void **)&uniqueid, NULL);
3676}
3677
3678/*
3679 * CHANGE_NOTIFY Request is sent to get notifications on changes to a directory
3680 * See MS-SMB2 2.2.35 and 2.2.36
3681 */
3682
3683static int
3684SMB2_notify_init(const unsigned int xid, struct smb_rqst *rqst,
3685		 struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3686		 u64 persistent_fid, u64 volatile_fid,
3687		 u32 completion_filter, bool watch_tree)
3688{
3689	struct smb2_change_notify_req *req;
3690	struct kvec *iov = rqst->rq_iov;
3691	unsigned int total_len;
3692	int rc;
3693
3694	rc = smb2_plain_req_init(SMB2_CHANGE_NOTIFY, tcon, server,
3695				 (void **) &req, &total_len);
3696	if (rc)
3697		return rc;
3698
3699	req->PersistentFileId = persistent_fid;
3700	req->VolatileFileId = volatile_fid;
3701	/* See note 354 of MS-SMB2, 64K max */
3702	req->OutputBufferLength =
3703		cpu_to_le32(SMB2_MAX_BUFFER_SIZE - MAX_SMB2_HDR_SIZE);
3704	req->CompletionFilter = cpu_to_le32(completion_filter);
3705	if (watch_tree)
3706		req->Flags = cpu_to_le16(SMB2_WATCH_TREE);
3707	else
3708		req->Flags = 0;
3709
3710	iov[0].iov_base = (char *)req;
3711	iov[0].iov_len = total_len;
3712
3713	return 0;
3714}
3715
3716int
3717SMB2_change_notify(const unsigned int xid, struct cifs_tcon *tcon,
3718		u64 persistent_fid, u64 volatile_fid, bool watch_tree,
3719		u32 completion_filter, u32 max_out_data_len, char **out_data,
3720		u32 *plen /* returned data len */)
3721{
3722	struct cifs_ses *ses = tcon->ses;
3723	struct TCP_Server_Info *server = cifs_pick_channel(ses);
3724	struct smb_rqst rqst;
3725	struct smb2_change_notify_rsp *smb_rsp;
3726	struct kvec iov[1];
3727	struct kvec rsp_iov = {NULL, 0};
3728	int resp_buftype = CIFS_NO_BUFFER;
3729	int flags = 0;
3730	int rc = 0;
3731
3732	cifs_dbg(FYI, "change notify\n");
3733	if (!ses || !server)
3734		return -EIO;
3735
3736	if (smb3_encryption_required(tcon))
3737		flags |= CIFS_TRANSFORM_REQ;
3738
3739	memset(&rqst, 0, sizeof(struct smb_rqst));
3740	memset(&iov, 0, sizeof(iov));
3741	if (plen)
3742		*plen = 0;
3743
3744	rqst.rq_iov = iov;
3745	rqst.rq_nvec = 1;
3746
3747	rc = SMB2_notify_init(xid, &rqst, tcon, server,
3748			      persistent_fid, volatile_fid,
3749			      completion_filter, watch_tree);
3750	if (rc)
3751		goto cnotify_exit;
3752
3753	trace_smb3_notify_enter(xid, persistent_fid, tcon->tid, ses->Suid,
3754				(u8)watch_tree, completion_filter);
3755	rc = cifs_send_recv(xid, ses, server,
3756			    &rqst, &resp_buftype, flags, &rsp_iov);
3757
3758	if (rc != 0) {
3759		cifs_stats_fail_inc(tcon, SMB2_CHANGE_NOTIFY_HE);
3760		trace_smb3_notify_err(xid, persistent_fid, tcon->tid, ses->Suid,
3761				(u8)watch_tree, completion_filter, rc);
3762	} else {
3763		trace_smb3_notify_done(xid, persistent_fid, tcon->tid,
3764			ses->Suid, (u8)watch_tree, completion_filter);
3765		/* validate that notify information is plausible */
3766		if ((rsp_iov.iov_base == NULL) ||
3767		    (rsp_iov.iov_len < sizeof(struct smb2_change_notify_rsp)))
3768			goto cnotify_exit;
3769
3770		smb_rsp = (struct smb2_change_notify_rsp *)rsp_iov.iov_base;
3771
3772		smb2_validate_iov(le16_to_cpu(smb_rsp->OutputBufferOffset),
3773				le32_to_cpu(smb_rsp->OutputBufferLength), &rsp_iov,
3774				sizeof(struct file_notify_information));
3775
3776		*out_data = kmemdup((char *)smb_rsp + le16_to_cpu(smb_rsp->OutputBufferOffset),
3777				le32_to_cpu(smb_rsp->OutputBufferLength), GFP_KERNEL);
3778		if (*out_data == NULL) {
3779			rc = -ENOMEM;
3780			goto cnotify_exit;
3781		} else
3782			*plen = le32_to_cpu(smb_rsp->OutputBufferLength);
3783	}
3784
3785 cnotify_exit:
3786	if (rqst.rq_iov)
3787		cifs_small_buf_release(rqst.rq_iov[0].iov_base); /* request */
3788	free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3789	return rc;
3790}
3791
3792
3793
3794/*
3795 * This is a no-op for now. We're not really interested in the reply, but
3796 * rather in the fact that the server sent one and that server->lstrp
3797 * gets updated.
3798 *
3799 * FIXME: maybe we should consider checking that the reply matches request?
3800 */
3801static void
3802smb2_echo_callback(struct mid_q_entry *mid)
3803{
3804	struct TCP_Server_Info *server = mid->callback_data;
3805	struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
3806	struct cifs_credits credits = { .value = 0, .instance = 0 };
3807
3808	if (mid->mid_state == MID_RESPONSE_RECEIVED
3809	    || mid->mid_state == MID_RESPONSE_MALFORMED) {
3810		credits.value = le16_to_cpu(rsp->hdr.CreditRequest);
3811		credits.instance = server->reconnect_instance;
3812	}
3813
3814	release_mid(mid);
3815	add_credits(server, &credits, CIFS_ECHO_OP);
3816}
3817
3818void smb2_reconnect_server(struct work_struct *work)
3819{
3820	struct TCP_Server_Info *server = container_of(work,
3821					struct TCP_Server_Info, reconnect.work);
3822	struct TCP_Server_Info *pserver;
3823	struct cifs_ses *ses, *ses2;
3824	struct cifs_tcon *tcon, *tcon2;
3825	struct list_head tmp_list, tmp_ses_list;
3826	bool tcon_exist = false, ses_exist = false;
3827	bool tcon_selected = false;
3828	int rc;
3829	bool resched = false;
3830
3831	/* If server is a channel, select the primary channel */
3832	pserver = CIFS_SERVER_IS_CHAN(server) ? server->primary_server : server;
3833
3834	/* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
3835	mutex_lock(&pserver->reconnect_mutex);
3836
3837	INIT_LIST_HEAD(&tmp_list);
3838	INIT_LIST_HEAD(&tmp_ses_list);
3839	cifs_dbg(FYI, "Reconnecting tcons and channels\n");
3840
3841	spin_lock(&cifs_tcp_ses_lock);
3842	list_for_each_entry(ses, &pserver->smb_ses_list, smb_ses_list) {
3843
3844		tcon_selected = false;
3845
3846		list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
3847			if (tcon->need_reconnect || tcon->need_reopen_files) {
3848				tcon->tc_count++;
3849				list_add_tail(&tcon->rlist, &tmp_list);
3850				tcon_selected = tcon_exist = true;
3851			}
3852		}
3853		/*
3854		 * IPC has the same lifetime as its session and uses its
3855		 * refcount.
3856		 */
3857		if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) {
3858			list_add_tail(&ses->tcon_ipc->rlist, &tmp_list);
3859			tcon_selected = tcon_exist = true;
3860			ses->ses_count++;
3861		}
3862		/*
3863		 * handle the case where channel needs to reconnect
3864		 * binding session, but tcon is healthy (some other channel
3865		 * is active)
3866		 */
3867		spin_lock(&ses->chan_lock);
3868		if (!tcon_selected && cifs_chan_needs_reconnect(ses, server)) {
3869			list_add_tail(&ses->rlist, &tmp_ses_list);
3870			ses_exist = true;
3871			ses->ses_count++;
3872		}
3873		spin_unlock(&ses->chan_lock);
3874	}
3875	/*
3876	 * Get the reference to server struct to be sure that the last call of
3877	 * cifs_put_tcon() in the loop below won't release the server pointer.
3878	 */
3879	if (tcon_exist || ses_exist)
3880		server->srv_count++;
3881
3882	spin_unlock(&cifs_tcp_ses_lock);
3883
3884	list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
3885		rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon, server);
3886		if (!rc)
3887			cifs_reopen_persistent_handles(tcon);
3888		else
3889			resched = true;
3890		list_del_init(&tcon->rlist);
3891		if (tcon->ipc)
3892			cifs_put_smb_ses(tcon->ses);
3893		else
3894			cifs_put_tcon(tcon);
3895	}
3896
3897	if (!ses_exist)
3898		goto done;
3899
3900	/* allocate a dummy tcon struct used for reconnect */
3901	tcon = kzalloc(sizeof(struct cifs_tcon), GFP_KERNEL);
3902	if (!tcon) {
3903		resched = true;
3904		list_for_each_entry_safe(ses, ses2, &tmp_ses_list, rlist) {
3905			list_del_init(&ses->rlist);
3906			cifs_put_smb_ses(ses);
3907		}
3908		goto done;
3909	}
3910
3911	tcon->status = TID_GOOD;
3912	tcon->retry = false;
3913	tcon->need_reconnect = false;
3914
3915	/* now reconnect sessions for necessary channels */
3916	list_for_each_entry_safe(ses, ses2, &tmp_ses_list, rlist) {
3917		tcon->ses = ses;
3918		rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon, server);
3919		if (rc)
3920			resched = true;
3921		list_del_init(&ses->rlist);
3922		cifs_put_smb_ses(ses);
3923	}
3924	kfree(tcon);
3925
3926done:
3927	cifs_dbg(FYI, "Reconnecting tcons and channels finished\n");
3928	if (resched)
3929		queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
3930	mutex_unlock(&pserver->reconnect_mutex);
3931
3932	/* now we can safely release srv struct */
3933	if (tcon_exist || ses_exist)
3934		cifs_put_tcp_session(server, 1);
3935}
3936
3937int
3938SMB2_echo(struct TCP_Server_Info *server)
3939{
3940	struct smb2_echo_req *req;
3941	int rc = 0;
3942	struct kvec iov[1];
3943	struct smb_rqst rqst = { .rq_iov = iov,
3944				 .rq_nvec = 1 };
3945	unsigned int total_len;
3946
3947	cifs_dbg(FYI, "In echo request for conn_id %lld\n", server->conn_id);
3948
3949	spin_lock(&server->srv_lock);
3950	if (server->ops->need_neg &&
3951	    server->ops->need_neg(server)) {
3952		spin_unlock(&server->srv_lock);
3953		/* No need to send echo on newly established connections */
3954		mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
3955		return rc;
3956	}
3957	spin_unlock(&server->srv_lock);
3958
3959	rc = smb2_plain_req_init(SMB2_ECHO, NULL, server,
3960				 (void **)&req, &total_len);
3961	if (rc)
3962		return rc;
3963
3964	req->hdr.CreditRequest = cpu_to_le16(1);
3965
3966	iov[0].iov_len = total_len;
3967	iov[0].iov_base = (char *)req;
3968
3969	rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
3970			     server, CIFS_ECHO_OP, NULL);
3971	if (rc)
3972		cifs_dbg(FYI, "Echo request failed: %d\n", rc);
3973
3974	cifs_small_buf_release(req);
3975	return rc;
3976}
3977
3978void
3979SMB2_flush_free(struct smb_rqst *rqst)
3980{
3981	if (rqst && rqst->rq_iov)
3982		cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3983}
3984
3985int
3986SMB2_flush_init(const unsigned int xid, struct smb_rqst *rqst,
3987		struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3988		u64 persistent_fid, u64 volatile_fid)
3989{
3990	struct smb2_flush_req *req;
3991	struct kvec *iov = rqst->rq_iov;
3992	unsigned int total_len;
3993	int rc;
3994
3995	rc = smb2_plain_req_init(SMB2_FLUSH, tcon, server,
3996				 (void **) &req, &total_len);
3997	if (rc)
3998		return rc;
3999
4000	req->PersistentFileId = persistent_fid;
4001	req->VolatileFileId = volatile_fid;
4002
4003	iov[0].iov_base = (char *)req;
4004	iov[0].iov_len = total_len;
4005
4006	return 0;
4007}
4008
4009int
4010SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
4011	   u64 volatile_fid)
4012{
4013	struct cifs_ses *ses = tcon->ses;
4014	struct smb_rqst rqst;
4015	struct kvec iov[1];
4016	struct kvec rsp_iov = {NULL, 0};
4017	struct TCP_Server_Info *server = cifs_pick_channel(ses);
4018	int resp_buftype = CIFS_NO_BUFFER;
4019	int flags = 0;
4020	int rc = 0;
4021
4022	cifs_dbg(FYI, "flush\n");
4023	if (!ses || !(ses->server))
4024		return -EIO;
4025
4026	if (smb3_encryption_required(tcon))
4027		flags |= CIFS_TRANSFORM_REQ;
4028
4029	memset(&rqst, 0, sizeof(struct smb_rqst));
4030	memset(&iov, 0, sizeof(iov));
4031	rqst.rq_iov = iov;
4032	rqst.rq_nvec = 1;
4033
4034	rc = SMB2_flush_init(xid, &rqst, tcon, server,
4035			     persistent_fid, volatile_fid);
4036	if (rc)
4037		goto flush_exit;
4038
4039	trace_smb3_flush_enter(xid, persistent_fid, tcon->tid, ses->Suid);
4040	rc = cifs_send_recv(xid, ses, server,
4041			    &rqst, &resp_buftype, flags, &rsp_iov);
4042
4043	if (rc != 0) {
4044		cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
4045		trace_smb3_flush_err(xid, persistent_fid, tcon->tid, ses->Suid,
4046				     rc);
4047	} else
4048		trace_smb3_flush_done(xid, persistent_fid, tcon->tid,
4049				      ses->Suid);
4050
4051 flush_exit:
4052	SMB2_flush_free(&rqst);
4053	free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4054	return rc;
4055}
4056
4057/*
4058 * To form a chain of read requests, any read requests after the first should
4059 * have the end_of_chain boolean set to true.
4060 */
4061static int
4062smb2_new_read_req(void **buf, unsigned int *total_len,
4063	struct cifs_io_parms *io_parms, struct cifs_readdata *rdata,
4064	unsigned int remaining_bytes, int request_type)
4065{
4066	int rc = -EACCES;
4067	struct smb2_read_req *req = NULL;
4068	struct smb2_hdr *shdr;
4069	struct TCP_Server_Info *server = io_parms->server;
4070
4071	rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, server,
4072				 (void **) &req, total_len);
4073	if (rc)
4074		return rc;
4075
4076	if (server == NULL)
4077		return -ECONNABORTED;
4078
4079	shdr = &req->hdr;
4080	shdr->Id.SyncId.ProcessId = cpu_to_le32(io_parms->pid);
4081
4082	req->PersistentFileId = io_parms->persistent_fid;
4083	req->VolatileFileId = io_parms->volatile_fid;
4084	req->ReadChannelInfoOffset = 0; /* reserved */
4085	req->ReadChannelInfoLength = 0; /* reserved */
4086	req->Channel = 0; /* reserved */
4087	req->MinimumCount = 0;
4088	req->Length = cpu_to_le32(io_parms->length);
4089	req->Offset = cpu_to_le64(io_parms->offset);
4090
4091	trace_smb3_read_enter(0 /* xid */,
4092			io_parms->persistent_fid,
4093			io_parms->tcon->tid, io_parms->tcon->ses->Suid,
4094			io_parms->offset, io_parms->length);
4095#ifdef CONFIG_CIFS_SMB_DIRECT
4096	/*
4097	 * If we want to do a RDMA write, fill in and append
4098	 * smbd_buffer_descriptor_v1 to the end of read request
4099	 */
4100	if (server->rdma && rdata && !server->sign &&
4101		rdata->bytes >= server->smbd_conn->rdma_readwrite_threshold) {
4102
4103		struct smbd_buffer_descriptor_v1 *v1;
4104		bool need_invalidate = server->dialect == SMB30_PROT_ID;
4105
4106		rdata->mr = smbd_register_mr(
4107				server->smbd_conn, rdata->pages,
4108				rdata->nr_pages, rdata->page_offset,
4109				rdata->tailsz, true, need_invalidate);
4110		if (!rdata->mr)
4111			return -EAGAIN;
4112
4113		req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
4114		if (need_invalidate)
4115			req->Channel = SMB2_CHANNEL_RDMA_V1;
4116		req->ReadChannelInfoOffset =
4117			cpu_to_le16(offsetof(struct smb2_read_req, Buffer));
4118		req->ReadChannelInfoLength =
4119			cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
4120		v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
4121		v1->offset = cpu_to_le64(rdata->mr->mr->iova);
4122		v1->token = cpu_to_le32(rdata->mr->mr->rkey);
4123		v1->length = cpu_to_le32(rdata->mr->mr->length);
4124
4125		*total_len += sizeof(*v1) - 1;
4126	}
4127#endif
4128	if (request_type & CHAINED_REQUEST) {
4129		if (!(request_type & END_OF_CHAIN)) {
4130			/* next 8-byte aligned request */
4131			*total_len = ALIGN(*total_len, 8);
4132			shdr->NextCommand = cpu_to_le32(*total_len);
4133		} else /* END_OF_CHAIN */
4134			shdr->NextCommand = 0;
4135		if (request_type & RELATED_REQUEST) {
4136			shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
4137			/*
4138			 * Related requests use info from previous read request
4139			 * in chain.
4140			 */
4141			shdr->SessionId = cpu_to_le64(0xFFFFFFFFFFFFFFFF);
4142			shdr->Id.SyncId.TreeId = cpu_to_le32(0xFFFFFFFF);
4143			req->PersistentFileId = (u64)-1;
4144			req->VolatileFileId = (u64)-1;
4145		}
4146	}
4147	if (remaining_bytes > io_parms->length)
4148		req->RemainingBytes = cpu_to_le32(remaining_bytes);
4149	else
4150		req->RemainingBytes = 0;
4151
4152	*buf = req;
4153	return rc;
4154}
4155
4156static void
4157smb2_readv_callback(struct mid_q_entry *mid)
4158{
4159	struct cifs_readdata *rdata = mid->callback_data;
4160	struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
4161	struct TCP_Server_Info *server = rdata->server;
4162	struct smb2_hdr *shdr =
4163				(struct smb2_hdr *)rdata->iov[0].iov_base;
4164	struct cifs_credits credits = { .value = 0, .instance = 0 };
4165	struct smb_rqst rqst = { .rq_iov = &rdata->iov[1],
4166				 .rq_nvec = 1, };
4167
4168	if (rdata->got_bytes) {
4169		rqst.rq_pages = rdata->pages;
4170		rqst.rq_offset = rdata->page_offset;
4171		rqst.rq_npages = rdata->nr_pages;
4172		rqst.rq_pagesz = rdata->pagesz;
4173		rqst.rq_tailsz = rdata->tailsz;
4174	}
4175
4176	WARN_ONCE(rdata->server != mid->server,
4177		  "rdata server %p != mid server %p",
4178		  rdata->server, mid->server);
4179
4180	cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
4181		 __func__, mid->mid, mid->mid_state, rdata->result,
4182		 rdata->bytes);
4183
4184	switch (mid->mid_state) {
4185	case MID_RESPONSE_RECEIVED:
4186		credits.value = le16_to_cpu(shdr->CreditRequest);
4187		credits.instance = server->reconnect_instance;
4188		/* result already set, check signature */
4189		if (server->sign && !mid->decrypted) {
4190			int rc;
4191
4192			rc = smb2_verify_signature(&rqst, server);
4193			if (rc)
4194				cifs_tcon_dbg(VFS, "SMB signature verification returned error = %d\n",
4195					 rc);
4196		}
4197		/* FIXME: should this be counted toward the initiating task? */
4198		task_io_account_read(rdata->got_bytes);
4199		cifs_stats_bytes_read(tcon, rdata->got_bytes);
4200		break;
4201	case MID_REQUEST_SUBMITTED:
4202	case MID_RETRY_NEEDED:
4203		rdata->result = -EAGAIN;
4204		if (server->sign && rdata->got_bytes)
4205			/* reset bytes number since we can not check a sign */
4206			rdata->got_bytes = 0;
4207		/* FIXME: should this be counted toward the initiating task? */
4208		task_io_account_read(rdata->got_bytes);
4209		cifs_stats_bytes_read(tcon, rdata->got_bytes);
4210		break;
4211	case MID_RESPONSE_MALFORMED:
4212		credits.value = le16_to_cpu(shdr->CreditRequest);
4213		credits.instance = server->reconnect_instance;
4214		fallthrough;
4215	default:
4216		rdata->result = -EIO;
4217	}
4218#ifdef CONFIG_CIFS_SMB_DIRECT
4219	/*
4220	 * If this rdata has a memmory registered, the MR can be freed
4221	 * MR needs to be freed as soon as I/O finishes to prevent deadlock
4222	 * because they have limited number and are used for future I/Os
4223	 */
4224	if (rdata->mr) {
4225		smbd_deregister_mr(rdata->mr);
4226		rdata->mr = NULL;
4227	}
4228#endif
4229	if (rdata->result && rdata->result != -ENODATA) {
4230		cifs_stats_fail_inc(tcon, SMB2_READ_HE);
4231		trace_smb3_read_err(0 /* xid */,
4232				    rdata->cfile->fid.persistent_fid,
4233				    tcon->tid, tcon->ses->Suid, rdata->offset,
4234				    rdata->bytes, rdata->result);
4235	} else
4236		trace_smb3_read_done(0 /* xid */,
4237				     rdata->cfile->fid.persistent_fid,
4238				     tcon->tid, tcon->ses->Suid,
4239				     rdata->offset, rdata->got_bytes);
4240
4241	queue_work(cifsiod_wq, &rdata->work);
4242	release_mid(mid);
4243	add_credits(server, &credits, 0);
4244}
4245
4246/* smb2_async_readv - send an async read, and set up mid to handle result */
4247int
4248smb2_async_readv(struct cifs_readdata *rdata)
4249{
4250	int rc, flags = 0;
4251	char *buf;
4252	struct smb2_hdr *shdr;
4253	struct cifs_io_parms io_parms;
4254	struct smb_rqst rqst = { .rq_iov = rdata->iov,
4255				 .rq_nvec = 1 };
4256	struct TCP_Server_Info *server;
4257	struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
4258	unsigned int total_len;
4259
4260	cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
4261		 __func__, rdata->offset, rdata->bytes);
4262
4263	if (!rdata->server)
4264		rdata->server = cifs_pick_channel(tcon->ses);
4265
4266	io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
4267	io_parms.server = server = rdata->server;
4268	io_parms.offset = rdata->offset;
4269	io_parms.length = rdata->bytes;
4270	io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
4271	io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
4272	io_parms.pid = rdata->pid;
4273
4274	rc = smb2_new_read_req(
4275		(void **) &buf, &total_len, &io_parms, rdata, 0, 0);
4276	if (rc)
4277		return rc;
4278
4279	if (smb3_encryption_required(io_parms.tcon))
4280		flags |= CIFS_TRANSFORM_REQ;
4281
4282	rdata->iov[0].iov_base = buf;
4283	rdata->iov[0].iov_len = total_len;
4284
4285	shdr = (struct smb2_hdr *)buf;
4286
4287	if (rdata->credits.value > 0) {
4288		shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
4289						SMB2_MAX_BUFFER_SIZE));
4290		shdr->CreditRequest = cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 8);
 
4291
4292		rc = adjust_credits(server, &rdata->credits, rdata->bytes);
4293		if (rc)
4294			goto async_readv_out;
4295
4296		flags |= CIFS_HAS_CREDITS;
4297	}
4298
4299	kref_get(&rdata->refcount);
4300	rc = cifs_call_async(server, &rqst,
4301			     cifs_readv_receive, smb2_readv_callback,
4302			     smb3_handle_read_data, rdata, flags,
4303			     &rdata->credits);
4304	if (rc) {
4305		kref_put(&rdata->refcount, cifs_readdata_release);
4306		cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
4307		trace_smb3_read_err(0 /* xid */, io_parms.persistent_fid,
4308				    io_parms.tcon->tid,
4309				    io_parms.tcon->ses->Suid,
4310				    io_parms.offset, io_parms.length, rc);
4311	}
4312
4313async_readv_out:
4314	cifs_small_buf_release(buf);
4315	return rc;
4316}
4317
4318int
4319SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
4320	  unsigned int *nbytes, char **buf, int *buf_type)
4321{
4322	struct smb_rqst rqst;
4323	int resp_buftype, rc;
4324	struct smb2_read_req *req = NULL;
4325	struct smb2_read_rsp *rsp = NULL;
4326	struct kvec iov[1];
4327	struct kvec rsp_iov;
4328	unsigned int total_len;
4329	int flags = CIFS_LOG_ERROR;
4330	struct cifs_ses *ses = io_parms->tcon->ses;
4331
4332	if (!io_parms->server)
4333		io_parms->server = cifs_pick_channel(io_parms->tcon->ses);
4334
4335	*nbytes = 0;
4336	rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0);
4337	if (rc)
4338		return rc;
4339
4340	if (smb3_encryption_required(io_parms->tcon))
4341		flags |= CIFS_TRANSFORM_REQ;
4342
4343	iov[0].iov_base = (char *)req;
4344	iov[0].iov_len = total_len;
4345
4346	memset(&rqst, 0, sizeof(struct smb_rqst));
4347	rqst.rq_iov = iov;
4348	rqst.rq_nvec = 1;
4349
4350	rc = cifs_send_recv(xid, ses, io_parms->server,
4351			    &rqst, &resp_buftype, flags, &rsp_iov);
4352	rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
4353
4354	if (rc) {
4355		if (rc != -ENODATA) {
4356			cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
4357			cifs_dbg(VFS, "Send error in read = %d\n", rc);
4358			trace_smb3_read_err(xid,
4359					    req->PersistentFileId,
4360					    io_parms->tcon->tid, ses->Suid,
4361					    io_parms->offset, io_parms->length,
4362					    rc);
4363		} else
4364			trace_smb3_read_done(xid, req->PersistentFileId, io_parms->tcon->tid,
4365					     ses->Suid, io_parms->offset, 0);
 
4366		free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4367		cifs_small_buf_release(req);
4368		return rc == -ENODATA ? 0 : rc;
4369	} else
4370		trace_smb3_read_done(xid,
4371				    req->PersistentFileId,
4372				    io_parms->tcon->tid, ses->Suid,
4373				    io_parms->offset, io_parms->length);
4374
4375	cifs_small_buf_release(req);
4376
4377	*nbytes = le32_to_cpu(rsp->DataLength);
4378	if ((*nbytes > CIFS_MAX_MSGSIZE) ||
4379	    (*nbytes > io_parms->length)) {
4380		cifs_dbg(FYI, "bad length %d for count %d\n",
4381			 *nbytes, io_parms->length);
4382		rc = -EIO;
4383		*nbytes = 0;
4384	}
4385
4386	if (*buf) {
4387		memcpy(*buf, (char *)rsp + rsp->DataOffset, *nbytes);
4388		free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4389	} else if (resp_buftype != CIFS_NO_BUFFER) {
4390		*buf = rsp_iov.iov_base;
4391		if (resp_buftype == CIFS_SMALL_BUFFER)
4392			*buf_type = CIFS_SMALL_BUFFER;
4393		else if (resp_buftype == CIFS_LARGE_BUFFER)
4394			*buf_type = CIFS_LARGE_BUFFER;
4395	}
4396	return rc;
4397}
4398
4399/*
4400 * Check the mid_state and signature on received buffer (if any), and queue the
4401 * workqueue completion task.
4402 */
4403static void
4404smb2_writev_callback(struct mid_q_entry *mid)
4405{
4406	struct cifs_writedata *wdata = mid->callback_data;
4407	struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
4408	struct TCP_Server_Info *server = wdata->server;
4409	unsigned int written;
4410	struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
4411	struct cifs_credits credits = { .value = 0, .instance = 0 };
4412
4413	WARN_ONCE(wdata->server != mid->server,
4414		  "wdata server %p != mid server %p",
4415		  wdata->server, mid->server);
4416
4417	switch (mid->mid_state) {
4418	case MID_RESPONSE_RECEIVED:
4419		credits.value = le16_to_cpu(rsp->hdr.CreditRequest);
4420		credits.instance = server->reconnect_instance;
4421		wdata->result = smb2_check_receive(mid, server, 0);
4422		if (wdata->result != 0)
4423			break;
4424
4425		written = le32_to_cpu(rsp->DataLength);
4426		/*
4427		 * Mask off high 16 bits when bytes written as returned
4428		 * by the server is greater than bytes requested by the
4429		 * client. OS/2 servers are known to set incorrect
4430		 * CountHigh values.
4431		 */
4432		if (written > wdata->bytes)
4433			written &= 0xFFFF;
4434
4435		if (written < wdata->bytes)
4436			wdata->result = -ENOSPC;
4437		else
4438			wdata->bytes = written;
4439		break;
4440	case MID_REQUEST_SUBMITTED:
4441	case MID_RETRY_NEEDED:
4442		wdata->result = -EAGAIN;
4443		break;
4444	case MID_RESPONSE_MALFORMED:
4445		credits.value = le16_to_cpu(rsp->hdr.CreditRequest);
4446		credits.instance = server->reconnect_instance;
4447		fallthrough;
4448	default:
4449		wdata->result = -EIO;
4450		break;
4451	}
4452#ifdef CONFIG_CIFS_SMB_DIRECT
4453	/*
4454	 * If this wdata has a memory registered, the MR can be freed
4455	 * The number of MRs available is limited, it's important to recover
4456	 * used MR as soon as I/O is finished. Hold MR longer in the later
4457	 * I/O process can possibly result in I/O deadlock due to lack of MR
4458	 * to send request on I/O retry
4459	 */
4460	if (wdata->mr) {
4461		smbd_deregister_mr(wdata->mr);
4462		wdata->mr = NULL;
4463	}
4464#endif
4465	if (wdata->result) {
4466		cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
4467		trace_smb3_write_err(0 /* no xid */,
4468				     wdata->cfile->fid.persistent_fid,
4469				     tcon->tid, tcon->ses->Suid, wdata->offset,
4470				     wdata->bytes, wdata->result);
4471		if (wdata->result == -ENOSPC)
4472			pr_warn_once("Out of space writing to %s\n",
4473				     tcon->tree_name);
4474	} else
4475		trace_smb3_write_done(0 /* no xid */,
4476				      wdata->cfile->fid.persistent_fid,
4477				      tcon->tid, tcon->ses->Suid,
4478				      wdata->offset, wdata->bytes);
4479
4480	queue_work(cifsiod_wq, &wdata->work);
4481	release_mid(mid);
4482	add_credits(server, &credits, 0);
4483}
4484
4485/* smb2_async_writev - send an async write, and set up mid to handle result */
4486int
4487smb2_async_writev(struct cifs_writedata *wdata,
4488		  void (*release)(struct kref *kref))
4489{
4490	int rc = -EACCES, flags = 0;
4491	struct smb2_write_req *req = NULL;
4492	struct smb2_hdr *shdr;
4493	struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
4494	struct TCP_Server_Info *server = wdata->server;
4495	struct kvec iov[1];
4496	struct smb_rqst rqst = { };
4497	unsigned int total_len;
4498
4499	if (!wdata->server)
4500		server = wdata->server = cifs_pick_channel(tcon->ses);
4501
4502	rc = smb2_plain_req_init(SMB2_WRITE, tcon, server,
4503				 (void **) &req, &total_len);
4504	if (rc)
4505		return rc;
4506
4507	if (smb3_encryption_required(tcon))
4508		flags |= CIFS_TRANSFORM_REQ;
4509
4510	shdr = (struct smb2_hdr *)req;
4511	shdr->Id.SyncId.ProcessId = cpu_to_le32(wdata->cfile->pid);
4512
4513	req->PersistentFileId = wdata->cfile->fid.persistent_fid;
4514	req->VolatileFileId = wdata->cfile->fid.volatile_fid;
4515	req->WriteChannelInfoOffset = 0;
4516	req->WriteChannelInfoLength = 0;
4517	req->Channel = 0;
4518	req->Offset = cpu_to_le64(wdata->offset);
4519	req->DataOffset = cpu_to_le16(
4520				offsetof(struct smb2_write_req, Buffer));
4521	req->RemainingBytes = 0;
4522
4523	trace_smb3_write_enter(0 /* xid */, wdata->cfile->fid.persistent_fid,
4524		tcon->tid, tcon->ses->Suid, wdata->offset, wdata->bytes);
4525#ifdef CONFIG_CIFS_SMB_DIRECT
4526	/*
4527	 * If we want to do a server RDMA read, fill in and append
4528	 * smbd_buffer_descriptor_v1 to the end of write request
4529	 */
4530	if (server->rdma && !server->sign && wdata->bytes >=
4531		server->smbd_conn->rdma_readwrite_threshold) {
4532
4533		struct smbd_buffer_descriptor_v1 *v1;
4534		bool need_invalidate = server->dialect == SMB30_PROT_ID;
4535
4536		wdata->mr = smbd_register_mr(
4537				server->smbd_conn, wdata->pages,
4538				wdata->nr_pages, wdata->page_offset,
4539				wdata->tailsz, false, need_invalidate);
4540		if (!wdata->mr) {
4541			rc = -EAGAIN;
4542			goto async_writev_out;
4543		}
4544		req->Length = 0;
4545		req->DataOffset = 0;
4546		if (wdata->nr_pages > 1)
4547			req->RemainingBytes =
4548				cpu_to_le32(
4549					(wdata->nr_pages - 1) * wdata->pagesz -
4550					wdata->page_offset + wdata->tailsz
4551				);
4552		else
4553			req->RemainingBytes = cpu_to_le32(wdata->tailsz);
4554		req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
4555		if (need_invalidate)
4556			req->Channel = SMB2_CHANNEL_RDMA_V1;
4557		req->WriteChannelInfoOffset =
4558			cpu_to_le16(offsetof(struct smb2_write_req, Buffer));
4559		req->WriteChannelInfoLength =
4560			cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
4561		v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
4562		v1->offset = cpu_to_le64(wdata->mr->mr->iova);
4563		v1->token = cpu_to_le32(wdata->mr->mr->rkey);
4564		v1->length = cpu_to_le32(wdata->mr->mr->length);
4565	}
4566#endif
4567	iov[0].iov_len = total_len - 1;
4568	iov[0].iov_base = (char *)req;
4569
4570	rqst.rq_iov = iov;
4571	rqst.rq_nvec = 1;
4572	rqst.rq_pages = wdata->pages;
4573	rqst.rq_offset = wdata->page_offset;
4574	rqst.rq_npages = wdata->nr_pages;
4575	rqst.rq_pagesz = wdata->pagesz;
4576	rqst.rq_tailsz = wdata->tailsz;
4577#ifdef CONFIG_CIFS_SMB_DIRECT
4578	if (wdata->mr) {
4579		iov[0].iov_len += sizeof(struct smbd_buffer_descriptor_v1);
4580		rqst.rq_npages = 0;
4581	}
4582#endif
4583	cifs_dbg(FYI, "async write at %llu %u bytes\n",
4584		 wdata->offset, wdata->bytes);
4585
4586#ifdef CONFIG_CIFS_SMB_DIRECT
4587	/* For RDMA read, I/O size is in RemainingBytes not in Length */
4588	if (!wdata->mr)
4589		req->Length = cpu_to_le32(wdata->bytes);
4590#else
4591	req->Length = cpu_to_le32(wdata->bytes);
4592#endif
4593
4594	if (wdata->credits.value > 0) {
4595		shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
4596						    SMB2_MAX_BUFFER_SIZE));
4597		shdr->CreditRequest = cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 8);
 
4598
4599		rc = adjust_credits(server, &wdata->credits, wdata->bytes);
4600		if (rc)
4601			goto async_writev_out;
4602
4603		flags |= CIFS_HAS_CREDITS;
4604	}
4605
4606	kref_get(&wdata->refcount);
4607	rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
4608			     wdata, flags, &wdata->credits);
4609
4610	if (rc) {
4611		trace_smb3_write_err(0 /* no xid */,
4612				     req->PersistentFileId,
4613				     tcon->tid, tcon->ses->Suid, wdata->offset,
4614				     wdata->bytes, rc);
4615		kref_put(&wdata->refcount, release);
4616		cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
4617	}
4618
4619async_writev_out:
4620	cifs_small_buf_release(req);
4621	return rc;
4622}
4623
4624/*
4625 * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
4626 * The length field from io_parms must be at least 1 and indicates a number of
4627 * elements with data to write that begins with position 1 in iov array. All
4628 * data length is specified by count.
4629 */
4630int
4631SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
4632	   unsigned int *nbytes, struct kvec *iov, int n_vec)
4633{
4634	struct smb_rqst rqst;
4635	int rc = 0;
4636	struct smb2_write_req *req = NULL;
4637	struct smb2_write_rsp *rsp = NULL;
4638	int resp_buftype;
4639	struct kvec rsp_iov;
4640	int flags = 0;
4641	unsigned int total_len;
4642	struct TCP_Server_Info *server;
4643
4644	*nbytes = 0;
4645
4646	if (n_vec < 1)
4647		return rc;
4648
4649	if (!io_parms->server)
4650		io_parms->server = cifs_pick_channel(io_parms->tcon->ses);
4651	server = io_parms->server;
4652	if (server == NULL)
4653		return -ECONNABORTED;
4654
4655	rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, server,
4656				 (void **) &req, &total_len);
4657	if (rc)
4658		return rc;
4659
4660	if (smb3_encryption_required(io_parms->tcon))
4661		flags |= CIFS_TRANSFORM_REQ;
4662
4663	req->hdr.Id.SyncId.ProcessId = cpu_to_le32(io_parms->pid);
4664
4665	req->PersistentFileId = io_parms->persistent_fid;
4666	req->VolatileFileId = io_parms->volatile_fid;
4667	req->WriteChannelInfoOffset = 0;
4668	req->WriteChannelInfoLength = 0;
4669	req->Channel = 0;
4670	req->Length = cpu_to_le32(io_parms->length);
4671	req->Offset = cpu_to_le64(io_parms->offset);
4672	req->DataOffset = cpu_to_le16(
4673				offsetof(struct smb2_write_req, Buffer));
4674	req->RemainingBytes = 0;
4675
4676	trace_smb3_write_enter(xid, io_parms->persistent_fid,
4677		io_parms->tcon->tid, io_parms->tcon->ses->Suid,
4678		io_parms->offset, io_parms->length);
4679
4680	iov[0].iov_base = (char *)req;
4681	/* 1 for Buffer */
4682	iov[0].iov_len = total_len - 1;
4683
4684	memset(&rqst, 0, sizeof(struct smb_rqst));
4685	rqst.rq_iov = iov;
4686	rqst.rq_nvec = n_vec + 1;
4687
4688	rc = cifs_send_recv(xid, io_parms->tcon->ses, server,
4689			    &rqst,
4690			    &resp_buftype, flags, &rsp_iov);
4691	rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
4692
4693	if (rc) {
4694		trace_smb3_write_err(xid,
4695				     req->PersistentFileId,
4696				     io_parms->tcon->tid,
4697				     io_parms->tcon->ses->Suid,
4698				     io_parms->offset, io_parms->length, rc);
4699		cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
4700		cifs_dbg(VFS, "Send error in write = %d\n", rc);
4701	} else {
4702		*nbytes = le32_to_cpu(rsp->DataLength);
4703		trace_smb3_write_done(xid,
4704				      req->PersistentFileId,
4705				      io_parms->tcon->tid,
4706				      io_parms->tcon->ses->Suid,
4707				      io_parms->offset, *nbytes);
4708	}
4709
4710	cifs_small_buf_release(req);
4711	free_rsp_buf(resp_buftype, rsp);
4712	return rc;
4713}
4714
4715int posix_info_sid_size(const void *beg, const void *end)
4716{
4717	size_t subauth;
4718	int total;
4719
4720	if (beg + 1 > end)
4721		return -1;
4722
4723	subauth = *(u8 *)(beg+1);
4724	if (subauth < 1 || subauth > 15)
4725		return -1;
4726
4727	total = 1 + 1 + 6 + 4*subauth;
4728	if (beg + total > end)
4729		return -1;
4730
4731	return total;
4732}
4733
4734int posix_info_parse(const void *beg, const void *end,
4735		     struct smb2_posix_info_parsed *out)
4736
4737{
4738	int total_len = 0;
4739	int owner_len, group_len;
4740	int name_len;
4741	const void *owner_sid;
4742	const void *group_sid;
4743	const void *name;
4744
4745	/* if no end bound given, assume payload to be correct */
4746	if (!end) {
4747		const struct smb2_posix_info *p = beg;
4748
4749		end = beg + le32_to_cpu(p->NextEntryOffset);
4750		/* last element will have a 0 offset, pick a sensible bound */
4751		if (end == beg)
4752			end += 0xFFFF;
4753	}
4754
4755	/* check base buf */
4756	if (beg + sizeof(struct smb2_posix_info) > end)
4757		return -1;
4758	total_len = sizeof(struct smb2_posix_info);
4759
4760	/* check owner sid */
4761	owner_sid = beg + total_len;
4762	owner_len = posix_info_sid_size(owner_sid, end);
4763	if (owner_len < 0)
4764		return -1;
4765	total_len += owner_len;
4766
4767	/* check group sid */
4768	group_sid = beg + total_len;
4769	group_len = posix_info_sid_size(group_sid, end);
4770	if (group_len < 0)
4771		return -1;
4772	total_len += group_len;
4773
4774	/* check name len */
4775	if (beg + total_len + 4 > end)
4776		return -1;
4777	name_len = le32_to_cpu(*(__le32 *)(beg + total_len));
4778	if (name_len < 1 || name_len > 0xFFFF)
4779		return -1;
4780	total_len += 4;
4781
4782	/* check name */
4783	name = beg + total_len;
4784	if (name + name_len > end)
4785		return -1;
4786	total_len += name_len;
4787
4788	if (out) {
4789		out->base = beg;
4790		out->size = total_len;
4791		out->name_len = name_len;
4792		out->name = name;
4793		memcpy(&out->owner, owner_sid, owner_len);
4794		memcpy(&out->group, group_sid, group_len);
 
 
4795	}
4796	return total_len;
4797}
4798
4799static int posix_info_extra_size(const void *beg, const void *end)
4800{
4801	int len = posix_info_parse(beg, end, NULL);
4802
4803	if (len < 0)
4804		return -1;
4805	return len - sizeof(struct smb2_posix_info);
4806}
4807
4808static unsigned int
4809num_entries(int infotype, char *bufstart, char *end_of_buf, char **lastentry,
4810	    size_t size)
4811{
4812	int len;
4813	unsigned int entrycount = 0;
4814	unsigned int next_offset = 0;
4815	char *entryptr;
4816	FILE_DIRECTORY_INFO *dir_info;
4817
4818	if (bufstart == NULL)
4819		return 0;
4820
4821	entryptr = bufstart;
4822
4823	while (1) {
4824		if (entryptr + next_offset < entryptr ||
4825		    entryptr + next_offset > end_of_buf ||
4826		    entryptr + next_offset + size > end_of_buf) {
4827			cifs_dbg(VFS, "malformed search entry would overflow\n");
4828			break;
4829		}
4830
4831		entryptr = entryptr + next_offset;
4832		dir_info = (FILE_DIRECTORY_INFO *)entryptr;
4833
4834		if (infotype == SMB_FIND_FILE_POSIX_INFO)
4835			len = posix_info_extra_size(entryptr, end_of_buf);
4836		else
4837			len = le32_to_cpu(dir_info->FileNameLength);
4838
4839		if (len < 0 ||
4840		    entryptr + len < entryptr ||
4841		    entryptr + len > end_of_buf ||
4842		    entryptr + len + size > end_of_buf) {
4843			cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
4844				 end_of_buf);
4845			break;
4846		}
4847
4848		*lastentry = entryptr;
4849		entrycount++;
4850
4851		next_offset = le32_to_cpu(dir_info->NextEntryOffset);
4852		if (!next_offset)
4853			break;
4854	}
4855
4856	return entrycount;
4857}
4858
4859/*
4860 * Readdir/FindFirst
4861 */
4862int SMB2_query_directory_init(const unsigned int xid,
4863			      struct cifs_tcon *tcon,
4864			      struct TCP_Server_Info *server,
4865			      struct smb_rqst *rqst,
4866			      u64 persistent_fid, u64 volatile_fid,
4867			      int index, int info_level)
4868{
4869	struct smb2_query_directory_req *req;
4870	unsigned char *bufptr;
4871	__le16 asteriks = cpu_to_le16('*');
4872	unsigned int output_size = CIFSMaxBufSize -
4873		MAX_SMB2_CREATE_RESPONSE_SIZE -
4874		MAX_SMB2_CLOSE_RESPONSE_SIZE;
4875	unsigned int total_len;
4876	struct kvec *iov = rqst->rq_iov;
4877	int len, rc;
4878
4879	rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, server,
4880				 (void **) &req, &total_len);
4881	if (rc)
4882		return rc;
4883
4884	switch (info_level) {
4885	case SMB_FIND_FILE_DIRECTORY_INFO:
4886		req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
4887		break;
4888	case SMB_FIND_FILE_ID_FULL_DIR_INFO:
4889		req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
4890		break;
4891	case SMB_FIND_FILE_POSIX_INFO:
4892		req->FileInformationClass = SMB_FIND_FILE_POSIX_INFO;
4893		break;
4894	default:
4895		cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
4896			info_level);
4897		return -EINVAL;
4898	}
4899
4900	req->FileIndex = cpu_to_le32(index);
4901	req->PersistentFileId = persistent_fid;
4902	req->VolatileFileId = volatile_fid;
4903
4904	len = 0x2;
4905	bufptr = req->Buffer;
4906	memcpy(bufptr, &asteriks, len);
4907
4908	req->FileNameOffset =
4909		cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1);
4910	req->FileNameLength = cpu_to_le16(len);
4911	/*
4912	 * BB could be 30 bytes or so longer if we used SMB2 specific
4913	 * buffer lengths, but this is safe and close enough.
4914	 */
4915	output_size = min_t(unsigned int, output_size, server->maxBuf);
4916	output_size = min_t(unsigned int, output_size, 2 << 15);
4917	req->OutputBufferLength = cpu_to_le32(output_size);
4918
4919	iov[0].iov_base = (char *)req;
4920	/* 1 for Buffer */
4921	iov[0].iov_len = total_len - 1;
4922
4923	iov[1].iov_base = (char *)(req->Buffer);
4924	iov[1].iov_len = len;
4925
4926	trace_smb3_query_dir_enter(xid, persistent_fid, tcon->tid,
4927			tcon->ses->Suid, index, output_size);
4928
4929	return 0;
4930}
4931
4932void SMB2_query_directory_free(struct smb_rqst *rqst)
4933{
4934	if (rqst && rqst->rq_iov) {
4935		cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
4936	}
4937}
4938
4939int
4940smb2_parse_query_directory(struct cifs_tcon *tcon,
4941			   struct kvec *rsp_iov,
4942			   int resp_buftype,
4943			   struct cifs_search_info *srch_inf)
4944{
4945	struct smb2_query_directory_rsp *rsp;
4946	size_t info_buf_size;
4947	char *end_of_smb;
4948	int rc;
4949
4950	rsp = (struct smb2_query_directory_rsp *)rsp_iov->iov_base;
4951
4952	switch (srch_inf->info_level) {
4953	case SMB_FIND_FILE_DIRECTORY_INFO:
4954		info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
4955		break;
4956	case SMB_FIND_FILE_ID_FULL_DIR_INFO:
4957		info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
4958		break;
4959	case SMB_FIND_FILE_POSIX_INFO:
4960		/* note that posix payload are variable size */
4961		info_buf_size = sizeof(struct smb2_posix_info);
4962		break;
4963	default:
4964		cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
4965			 srch_inf->info_level);
4966		return -EINVAL;
4967	}
4968
4969	rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4970			       le32_to_cpu(rsp->OutputBufferLength), rsp_iov,
4971			       info_buf_size);
4972	if (rc) {
4973		cifs_tcon_dbg(VFS, "bad info payload");
4974		return rc;
4975	}
4976
4977	srch_inf->unicode = true;
4978
4979	if (srch_inf->ntwrk_buf_start) {
4980		if (srch_inf->smallBuf)
4981			cifs_small_buf_release(srch_inf->ntwrk_buf_start);
4982		else
4983			cifs_buf_release(srch_inf->ntwrk_buf_start);
4984	}
4985	srch_inf->ntwrk_buf_start = (char *)rsp;
4986	srch_inf->srch_entries_start = srch_inf->last_entry =
4987		(char *)rsp + le16_to_cpu(rsp->OutputBufferOffset);
4988	end_of_smb = rsp_iov->iov_len + (char *)rsp;
4989
4990	srch_inf->entries_in_buffer = num_entries(
4991		srch_inf->info_level,
4992		srch_inf->srch_entries_start,
4993		end_of_smb,
4994		&srch_inf->last_entry,
4995		info_buf_size);
4996
4997	srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
4998	cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
4999		 srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
5000		 srch_inf->srch_entries_start, srch_inf->last_entry);
5001	if (resp_buftype == CIFS_LARGE_BUFFER)
5002		srch_inf->smallBuf = false;
5003	else if (resp_buftype == CIFS_SMALL_BUFFER)
5004		srch_inf->smallBuf = true;
5005	else
5006		cifs_tcon_dbg(VFS, "Invalid search buffer type\n");
5007
5008	return 0;
5009}
5010
5011int
5012SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
5013		     u64 persistent_fid, u64 volatile_fid, int index,
5014		     struct cifs_search_info *srch_inf)
5015{
5016	struct smb_rqst rqst;
5017	struct kvec iov[SMB2_QUERY_DIRECTORY_IOV_SIZE];
5018	struct smb2_query_directory_rsp *rsp = NULL;
5019	int resp_buftype = CIFS_NO_BUFFER;
5020	struct kvec rsp_iov;
5021	int rc = 0;
5022	struct cifs_ses *ses = tcon->ses;
5023	struct TCP_Server_Info *server = cifs_pick_channel(ses);
5024	int flags = 0;
5025
5026	if (!ses || !(ses->server))
5027		return -EIO;
5028
5029	if (smb3_encryption_required(tcon))
5030		flags |= CIFS_TRANSFORM_REQ;
5031
5032	memset(&rqst, 0, sizeof(struct smb_rqst));
5033	memset(&iov, 0, sizeof(iov));
5034	rqst.rq_iov = iov;
5035	rqst.rq_nvec = SMB2_QUERY_DIRECTORY_IOV_SIZE;
5036
5037	rc = SMB2_query_directory_init(xid, tcon, server,
5038				       &rqst, persistent_fid,
5039				       volatile_fid, index,
5040				       srch_inf->info_level);
5041	if (rc)
5042		goto qdir_exit;
5043
5044	rc = cifs_send_recv(xid, ses, server,
5045			    &rqst, &resp_buftype, flags, &rsp_iov);
5046	rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
5047
5048	if (rc) {
5049		if (rc == -ENODATA &&
5050		    rsp->hdr.Status == STATUS_NO_MORE_FILES) {
5051			trace_smb3_query_dir_done(xid, persistent_fid,
5052				tcon->tid, tcon->ses->Suid, index, 0);
5053			srch_inf->endOfSearch = true;
5054			rc = 0;
5055		} else {
5056			trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
5057				tcon->ses->Suid, index, 0, rc);
5058			cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
5059		}
5060		goto qdir_exit;
5061	}
5062
5063	rc = smb2_parse_query_directory(tcon, &rsp_iov,	resp_buftype,
5064					srch_inf);
5065	if (rc) {
5066		trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
5067			tcon->ses->Suid, index, 0, rc);
5068		goto qdir_exit;
5069	}
5070	resp_buftype = CIFS_NO_BUFFER;
5071
5072	trace_smb3_query_dir_done(xid, persistent_fid, tcon->tid,
5073			tcon->ses->Suid, index, srch_inf->entries_in_buffer);
5074
5075qdir_exit:
5076	SMB2_query_directory_free(&rqst);
5077	free_rsp_buf(resp_buftype, rsp);
5078	return rc;
5079}
5080
5081int
5082SMB2_set_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
5083		   struct smb_rqst *rqst,
5084		   u64 persistent_fid, u64 volatile_fid, u32 pid,
5085		   u8 info_class, u8 info_type, u32 additional_info,
5086		   void **data, unsigned int *size)
5087{
5088	struct smb2_set_info_req *req;
5089	struct kvec *iov = rqst->rq_iov;
5090	unsigned int i, total_len;
5091	int rc;
5092
5093	rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, server,
5094				 (void **) &req, &total_len);
5095	if (rc)
5096		return rc;
5097
5098	req->hdr.Id.SyncId.ProcessId = cpu_to_le32(pid);
5099	req->InfoType = info_type;
5100	req->FileInfoClass = info_class;
5101	req->PersistentFileId = persistent_fid;
5102	req->VolatileFileId = volatile_fid;
5103	req->AdditionalInformation = cpu_to_le32(additional_info);
5104
5105	req->BufferOffset =
5106			cpu_to_le16(sizeof(struct smb2_set_info_req) - 1);
5107	req->BufferLength = cpu_to_le32(*size);
5108
5109	memcpy(req->Buffer, *data, *size);
5110	total_len += *size;
5111
5112	iov[0].iov_base = (char *)req;
5113	/* 1 for Buffer */
5114	iov[0].iov_len = total_len - 1;
5115
5116	for (i = 1; i < rqst->rq_nvec; i++) {
5117		le32_add_cpu(&req->BufferLength, size[i]);
5118		iov[i].iov_base = (char *)data[i];
5119		iov[i].iov_len = size[i];
5120	}
5121
5122	return 0;
5123}
5124
5125void
5126SMB2_set_info_free(struct smb_rqst *rqst)
5127{
5128	if (rqst && rqst->rq_iov)
5129		cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
5130}
5131
5132static int
5133send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
5134	       u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
5135	       u8 info_type, u32 additional_info, unsigned int num,
5136		void **data, unsigned int *size)
5137{
5138	struct smb_rqst rqst;
5139	struct smb2_set_info_rsp *rsp = NULL;
5140	struct kvec *iov;
5141	struct kvec rsp_iov;
5142	int rc = 0;
5143	int resp_buftype;
5144	struct cifs_ses *ses = tcon->ses;
5145	struct TCP_Server_Info *server = cifs_pick_channel(ses);
5146	int flags = 0;
5147
5148	if (!ses || !server)
5149		return -EIO;
5150
5151	if (!num)
5152		return -EINVAL;
5153
5154	if (smb3_encryption_required(tcon))
5155		flags |= CIFS_TRANSFORM_REQ;
5156
5157	iov = kmalloc_array(num, sizeof(struct kvec), GFP_KERNEL);
5158	if (!iov)
5159		return -ENOMEM;
5160
5161	memset(&rqst, 0, sizeof(struct smb_rqst));
5162	rqst.rq_iov = iov;
5163	rqst.rq_nvec = num;
5164
5165	rc = SMB2_set_info_init(tcon, server,
5166				&rqst, persistent_fid, volatile_fid, pid,
5167				info_class, info_type, additional_info,
5168				data, size);
5169	if (rc) {
5170		kfree(iov);
5171		return rc;
5172	}
5173
5174
5175	rc = cifs_send_recv(xid, ses, server,
5176			    &rqst, &resp_buftype, flags,
5177			    &rsp_iov);
5178	SMB2_set_info_free(&rqst);
5179	rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
5180
5181	if (rc != 0) {
5182		cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
5183		trace_smb3_set_info_err(xid, persistent_fid, tcon->tid,
5184				ses->Suid, info_class, (__u32)info_type, rc);
5185	}
5186
5187	free_rsp_buf(resp_buftype, rsp);
5188	kfree(iov);
5189	return rc;
5190}
5191
5192int
5193SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
5194	     u64 volatile_fid, u32 pid, __le64 *eof)
5195{
5196	struct smb2_file_eof_info info;
5197	void *data;
5198	unsigned int size;
5199
5200	info.EndOfFile = *eof;
5201
5202	data = &info;
5203	size = sizeof(struct smb2_file_eof_info);
5204
5205	trace_smb3_set_eof(xid, persistent_fid, tcon->tid, tcon->ses->Suid, le64_to_cpu(*eof));
5206
5207	return send_set_info(xid, tcon, persistent_fid, volatile_fid,
5208			pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
5209			0, 1, &data, &size);
5210}
5211
5212int
5213SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,
5214		u64 persistent_fid, u64 volatile_fid,
5215		struct cifs_ntsd *pnntsd, int pacllen, int aclflag)
5216{
5217	return send_set_info(xid, tcon, persistent_fid, volatile_fid,
5218			current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag,
5219			1, (void **)&pnntsd, &pacllen);
5220}
5221
5222int
5223SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
5224	    u64 persistent_fid, u64 volatile_fid,
5225	    struct smb2_file_full_ea_info *buf, int len)
5226{
5227	return send_set_info(xid, tcon, persistent_fid, volatile_fid,
5228		current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE,
5229		0, 1, (void **)&buf, &len);
5230}
5231
5232int
5233SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
5234		  const u64 persistent_fid, const u64 volatile_fid,
5235		  __u8 oplock_level)
5236{
5237	struct smb_rqst rqst;
5238	int rc;
5239	struct smb2_oplock_break *req = NULL;
5240	struct cifs_ses *ses = tcon->ses;
5241	struct TCP_Server_Info *server = cifs_pick_channel(ses);
5242	int flags = CIFS_OBREAK_OP;
5243	unsigned int total_len;
5244	struct kvec iov[1];
5245	struct kvec rsp_iov;
5246	int resp_buf_type;
5247
5248	cifs_dbg(FYI, "SMB2_oplock_break\n");
5249	rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server,
5250				 (void **) &req, &total_len);
5251	if (rc)
5252		return rc;
5253
5254	if (smb3_encryption_required(tcon))
5255		flags |= CIFS_TRANSFORM_REQ;
5256
5257	req->VolatileFid = volatile_fid;
5258	req->PersistentFid = persistent_fid;
5259	req->OplockLevel = oplock_level;
5260	req->hdr.CreditRequest = cpu_to_le16(1);
5261
5262	flags |= CIFS_NO_RSP_BUF;
5263
5264	iov[0].iov_base = (char *)req;
5265	iov[0].iov_len = total_len;
5266
5267	memset(&rqst, 0, sizeof(struct smb_rqst));
5268	rqst.rq_iov = iov;
5269	rqst.rq_nvec = 1;
5270
5271	rc = cifs_send_recv(xid, ses, server,
5272			    &rqst, &resp_buf_type, flags, &rsp_iov);
5273	cifs_small_buf_release(req);
5274
5275	if (rc) {
5276		cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
5277		cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
5278	}
5279
5280	return rc;
5281}
5282
5283void
5284smb2_copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
5285			     struct kstatfs *kst)
5286{
5287	kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
5288			  le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
5289	kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
5290	kst->f_bfree  = kst->f_bavail =
5291			le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
5292	return;
5293}
5294
5295static void
5296copy_posix_fs_info_to_kstatfs(FILE_SYSTEM_POSIX_INFO *response_data,
5297			struct kstatfs *kst)
5298{
5299	kst->f_bsize = le32_to_cpu(response_data->BlockSize);
5300	kst->f_blocks = le64_to_cpu(response_data->TotalBlocks);
5301	kst->f_bfree =  le64_to_cpu(response_data->BlocksAvail);
5302	if (response_data->UserBlocksAvail == cpu_to_le64(-1))
5303		kst->f_bavail = kst->f_bfree;
5304	else
5305		kst->f_bavail = le64_to_cpu(response_data->UserBlocksAvail);
5306	if (response_data->TotalFileNodes != cpu_to_le64(-1))
5307		kst->f_files = le64_to_cpu(response_data->TotalFileNodes);
5308	if (response_data->FreeFileNodes != cpu_to_le64(-1))
5309		kst->f_ffree = le64_to_cpu(response_data->FreeFileNodes);
5310
5311	return;
5312}
5313
5314static int
5315build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon,
5316		   struct TCP_Server_Info *server,
5317		   int level, int outbuf_len, u64 persistent_fid,
5318		   u64 volatile_fid)
5319{
5320	int rc;
5321	struct smb2_query_info_req *req;
5322	unsigned int total_len;
5323
5324	cifs_dbg(FYI, "Query FSInfo level %d\n", level);
5325
5326	if ((tcon->ses == NULL) || server == NULL)
5327		return -EIO;
5328
5329	rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server,
5330				 (void **) &req, &total_len);
5331	if (rc)
5332		return rc;
5333
5334	req->InfoType = SMB2_O_INFO_FILESYSTEM;
5335	req->FileInfoClass = level;
5336	req->PersistentFileId = persistent_fid;
5337	req->VolatileFileId = volatile_fid;
5338	/* 1 for pad */
5339	req->InputBufferOffset =
5340			cpu_to_le16(sizeof(struct smb2_query_info_req) - 1);
5341	req->OutputBufferLength = cpu_to_le32(
5342		outbuf_len + sizeof(struct smb2_query_info_rsp) - 1);
5343
5344	iov->iov_base = (char *)req;
5345	iov->iov_len = total_len;
5346	return 0;
5347}
5348
5349int
5350SMB311_posix_qfs_info(const unsigned int xid, struct cifs_tcon *tcon,
5351	      u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
5352{
5353	struct smb_rqst rqst;
5354	struct smb2_query_info_rsp *rsp = NULL;
5355	struct kvec iov;
5356	struct kvec rsp_iov;
5357	int rc = 0;
5358	int resp_buftype;
5359	struct cifs_ses *ses = tcon->ses;
5360	struct TCP_Server_Info *server = cifs_pick_channel(ses);
5361	FILE_SYSTEM_POSIX_INFO *info = NULL;
5362	int flags = 0;
5363
5364	rc = build_qfs_info_req(&iov, tcon, server,
5365				FS_POSIX_INFORMATION,
5366				sizeof(FILE_SYSTEM_POSIX_INFO),
5367				persistent_fid, volatile_fid);
5368	if (rc)
5369		return rc;
5370
5371	if (smb3_encryption_required(tcon))
5372		flags |= CIFS_TRANSFORM_REQ;
5373
5374	memset(&rqst, 0, sizeof(struct smb_rqst));
5375	rqst.rq_iov = &iov;
5376	rqst.rq_nvec = 1;
5377
5378	rc = cifs_send_recv(xid, ses, server,
5379			    &rqst, &resp_buftype, flags, &rsp_iov);
5380	cifs_small_buf_release(iov.iov_base);
5381	if (rc) {
5382		cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5383		goto posix_qfsinf_exit;
5384	}
5385	rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5386
5387	info = (FILE_SYSTEM_POSIX_INFO *)(
5388		le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
5389	rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
5390			       le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
5391			       sizeof(FILE_SYSTEM_POSIX_INFO));
5392	if (!rc)
5393		copy_posix_fs_info_to_kstatfs(info, fsdata);
5394
5395posix_qfsinf_exit:
5396	free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5397	return rc;
5398}
5399
5400int
5401SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
5402	      u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
5403{
5404	struct smb_rqst rqst;
5405	struct smb2_query_info_rsp *rsp = NULL;
5406	struct kvec iov;
5407	struct kvec rsp_iov;
5408	int rc = 0;
5409	int resp_buftype;
5410	struct cifs_ses *ses = tcon->ses;
5411	struct TCP_Server_Info *server = cifs_pick_channel(ses);
5412	struct smb2_fs_full_size_info *info = NULL;
5413	int flags = 0;
5414
5415	rc = build_qfs_info_req(&iov, tcon, server,
5416				FS_FULL_SIZE_INFORMATION,
5417				sizeof(struct smb2_fs_full_size_info),
5418				persistent_fid, volatile_fid);
5419	if (rc)
5420		return rc;
5421
5422	if (smb3_encryption_required(tcon))
5423		flags |= CIFS_TRANSFORM_REQ;
5424
5425	memset(&rqst, 0, sizeof(struct smb_rqst));
5426	rqst.rq_iov = &iov;
5427	rqst.rq_nvec = 1;
5428
5429	rc = cifs_send_recv(xid, ses, server,
5430			    &rqst, &resp_buftype, flags, &rsp_iov);
5431	cifs_small_buf_release(iov.iov_base);
5432	if (rc) {
5433		cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5434		goto qfsinf_exit;
5435	}
5436	rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5437
5438	info = (struct smb2_fs_full_size_info *)(
5439		le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
5440	rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
5441			       le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
5442			       sizeof(struct smb2_fs_full_size_info));
5443	if (!rc)
5444		smb2_copy_fs_info_to_kstatfs(info, fsdata);
5445
5446qfsinf_exit:
5447	free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5448	return rc;
5449}
5450
5451int
5452SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
5453	      u64 persistent_fid, u64 volatile_fid, int level)
5454{
5455	struct smb_rqst rqst;
5456	struct smb2_query_info_rsp *rsp = NULL;
5457	struct kvec iov;
5458	struct kvec rsp_iov;
5459	int rc = 0;
5460	int resp_buftype, max_len, min_len;
5461	struct cifs_ses *ses = tcon->ses;
5462	struct TCP_Server_Info *server = cifs_pick_channel(ses);
5463	unsigned int rsp_len, offset;
5464	int flags = 0;
5465
5466	if (level == FS_DEVICE_INFORMATION) {
5467		max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
5468		min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
5469	} else if (level == FS_ATTRIBUTE_INFORMATION) {
5470		max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
5471		min_len = MIN_FS_ATTR_INFO_SIZE;
5472	} else if (level == FS_SECTOR_SIZE_INFORMATION) {
5473		max_len = sizeof(struct smb3_fs_ss_info);
5474		min_len = sizeof(struct smb3_fs_ss_info);
5475	} else if (level == FS_VOLUME_INFORMATION) {
5476		max_len = sizeof(struct smb3_fs_vol_info) + MAX_VOL_LABEL_LEN;
5477		min_len = sizeof(struct smb3_fs_vol_info);
5478	} else {
5479		cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
5480		return -EINVAL;
5481	}
5482
5483	rc = build_qfs_info_req(&iov, tcon, server,
5484				level, max_len,
5485				persistent_fid, volatile_fid);
5486	if (rc)
5487		return rc;
5488
5489	if (smb3_encryption_required(tcon))
5490		flags |= CIFS_TRANSFORM_REQ;
5491
5492	memset(&rqst, 0, sizeof(struct smb_rqst));
5493	rqst.rq_iov = &iov;
5494	rqst.rq_nvec = 1;
5495
5496	rc = cifs_send_recv(xid, ses, server,
5497			    &rqst, &resp_buftype, flags, &rsp_iov);
5498	cifs_small_buf_release(iov.iov_base);
5499	if (rc) {
5500		cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5501		goto qfsattr_exit;
5502	}
5503	rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5504
5505	rsp_len = le32_to_cpu(rsp->OutputBufferLength);
5506	offset = le16_to_cpu(rsp->OutputBufferOffset);
5507	rc = smb2_validate_iov(offset, rsp_len, &rsp_iov, min_len);
5508	if (rc)
5509		goto qfsattr_exit;
5510
5511	if (level == FS_ATTRIBUTE_INFORMATION)
5512		memcpy(&tcon->fsAttrInfo, offset
5513			+ (char *)rsp, min_t(unsigned int,
5514			rsp_len, max_len));
5515	else if (level == FS_DEVICE_INFORMATION)
5516		memcpy(&tcon->fsDevInfo, offset
5517			+ (char *)rsp, sizeof(FILE_SYSTEM_DEVICE_INFO));
5518	else if (level == FS_SECTOR_SIZE_INFORMATION) {
5519		struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
5520			(offset + (char *)rsp);
5521		tcon->ss_flags = le32_to_cpu(ss_info->Flags);
5522		tcon->perf_sector_size =
5523			le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
5524	} else if (level == FS_VOLUME_INFORMATION) {
5525		struct smb3_fs_vol_info *vol_info = (struct smb3_fs_vol_info *)
5526			(offset + (char *)rsp);
5527		tcon->vol_serial_number = vol_info->VolumeSerialNumber;
5528		tcon->vol_create_time = vol_info->VolumeCreationTime;
5529	}
5530
5531qfsattr_exit:
5532	free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5533	return rc;
5534}
5535
5536int
5537smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
5538	   const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
5539	   const __u32 num_lock, struct smb2_lock_element *buf)
5540{
5541	struct smb_rqst rqst;
5542	int rc = 0;
5543	struct smb2_lock_req *req = NULL;
5544	struct kvec iov[2];
5545	struct kvec rsp_iov;
5546	int resp_buf_type;
5547	unsigned int count;
5548	int flags = CIFS_NO_RSP_BUF;
5549	unsigned int total_len;
5550	struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses);
5551
5552	cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
5553
5554	rc = smb2_plain_req_init(SMB2_LOCK, tcon, server,
5555				 (void **) &req, &total_len);
5556	if (rc)
5557		return rc;
5558
5559	if (smb3_encryption_required(tcon))
5560		flags |= CIFS_TRANSFORM_REQ;
5561
5562	req->hdr.Id.SyncId.ProcessId = cpu_to_le32(pid);
5563	req->LockCount = cpu_to_le16(num_lock);
5564
5565	req->PersistentFileId = persist_fid;
5566	req->VolatileFileId = volatile_fid;
5567
5568	count = num_lock * sizeof(struct smb2_lock_element);
5569
5570	iov[0].iov_base = (char *)req;
5571	iov[0].iov_len = total_len - sizeof(struct smb2_lock_element);
5572	iov[1].iov_base = (char *)buf;
5573	iov[1].iov_len = count;
5574
5575	cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
5576
5577	memset(&rqst, 0, sizeof(struct smb_rqst));
5578	rqst.rq_iov = iov;
5579	rqst.rq_nvec = 2;
5580
5581	rc = cifs_send_recv(xid, tcon->ses, server,
5582			    &rqst, &resp_buf_type, flags,
5583			    &rsp_iov);
5584	cifs_small_buf_release(req);
5585	if (rc) {
5586		cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
5587		cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
5588		trace_smb3_lock_err(xid, persist_fid, tcon->tid,
5589				    tcon->ses->Suid, rc);
5590	}
5591
5592	return rc;
5593}
5594
5595int
5596SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
5597	  const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
5598	  const __u64 length, const __u64 offset, const __u32 lock_flags,
5599	  const bool wait)
5600{
5601	struct smb2_lock_element lock;
5602
5603	lock.Offset = cpu_to_le64(offset);
5604	lock.Length = cpu_to_le64(length);
5605	lock.Flags = cpu_to_le32(lock_flags);
5606	if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
5607		lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
5608
5609	return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
5610}
5611
5612int
5613SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
5614		 __u8 *lease_key, const __le32 lease_state)
5615{
5616	struct smb_rqst rqst;
5617	int rc;
5618	struct smb2_lease_ack *req = NULL;
5619	struct cifs_ses *ses = tcon->ses;
5620	int flags = CIFS_OBREAK_OP;
5621	unsigned int total_len;
5622	struct kvec iov[1];
5623	struct kvec rsp_iov;
5624	int resp_buf_type;
5625	__u64 *please_key_high;
5626	__u64 *please_key_low;
5627	struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses);
5628
5629	cifs_dbg(FYI, "SMB2_lease_break\n");
5630	rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server,
5631				 (void **) &req, &total_len);
5632	if (rc)
5633		return rc;
5634
5635	if (smb3_encryption_required(tcon))
5636		flags |= CIFS_TRANSFORM_REQ;
5637
5638	req->hdr.CreditRequest = cpu_to_le16(1);
5639	req->StructureSize = cpu_to_le16(36);
5640	total_len += 12;
5641
5642	memcpy(req->LeaseKey, lease_key, 16);
5643	req->LeaseState = lease_state;
5644
5645	flags |= CIFS_NO_RSP_BUF;
5646
5647	iov[0].iov_base = (char *)req;
5648	iov[0].iov_len = total_len;
5649
5650	memset(&rqst, 0, sizeof(struct smb_rqst));
5651	rqst.rq_iov = iov;
5652	rqst.rq_nvec = 1;
5653
5654	rc = cifs_send_recv(xid, ses, server,
5655			    &rqst, &resp_buf_type, flags, &rsp_iov);
5656	cifs_small_buf_release(req);
5657
5658	please_key_low = (__u64 *)lease_key;
5659	please_key_high = (__u64 *)(lease_key+8);
5660	if (rc) {
5661		cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
5662		trace_smb3_lease_err(le32_to_cpu(lease_state), tcon->tid,
5663			ses->Suid, *please_key_low, *please_key_high, rc);
5664		cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
5665	} else
5666		trace_smb3_lease_done(le32_to_cpu(lease_state), tcon->tid,
5667			ses->Suid, *please_key_low, *please_key_high);
5668
5669	return rc;
5670}