smb2pdu.c 104.5 KB
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/*
 *   fs/cifs/smb2pdu.c
 *
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 *   Copyright (C) International Business Machines  Corp., 2009, 2013
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 *                 Etersoft, 2012
 *   Author(s): Steve French (sfrench@us.ibm.com)
 *              Pavel Shilovsky (pshilovsky@samba.org) 2012
 *
 *   Contains the routines for constructing the SMB2 PDUs themselves
 *
 *   This library is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU Lesser General Public License as published
 *   by the Free Software Foundation; either version 2.1 of the License, or
 *   (at your option) any later version.
 *
 *   This library is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 *   the GNU Lesser General Public License for more details.
 *
 *   You should have received a copy of the GNU Lesser General Public License
 *   along with this library; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

 /* SMB2 PDU handling routines here - except for leftovers (eg session setup) */
 /* Note that there are handle based routines which must be		      */
 /* treated slightly differently for reconnection purposes since we never     */
 /* want to reuse a stale file handle and only the caller knows the file info */

#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/vfs.h>
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#include <linux/task_io_accounting_ops.h>
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#include <linux/uaccess.h>
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#include <linux/uuid.h>
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#include <linux/pagemap.h>
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#include <linux/xattr.h>
#include "smb2pdu.h"
#include "cifsglob.h"
#include "cifsacl.h"
#include "cifsproto.h"
#include "smb2proto.h"
#include "cifs_unicode.h"
#include "cifs_debug.h"
#include "ntlmssp.h"
#include "smb2status.h"
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#include "smb2glob.h"
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#include "cifspdu.h"
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#include "cifs_spnego.h"
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#include "smbdirect.h"
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/*
 *  The following table defines the expected "StructureSize" of SMB2 requests
 *  in order by SMB2 command.  This is similar to "wct" in SMB/CIFS requests.
 *
 *  Note that commands are defined in smb2pdu.h in le16 but the array below is
 *  indexed by command in host byte order.
 */
static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
	/* SMB2_NEGOTIATE */ 36,
	/* SMB2_SESSION_SETUP */ 25,
	/* SMB2_LOGOFF */ 4,
	/* SMB2_TREE_CONNECT */	9,
	/* SMB2_TREE_DISCONNECT */ 4,
	/* SMB2_CREATE */ 57,
	/* SMB2_CLOSE */ 24,
	/* SMB2_FLUSH */ 24,
	/* SMB2_READ */	49,
	/* SMB2_WRITE */ 49,
	/* SMB2_LOCK */	48,
	/* SMB2_IOCTL */ 57,
	/* SMB2_CANCEL */ 4,
	/* SMB2_ECHO */ 4,
	/* SMB2_QUERY_DIRECTORY */ 33,
	/* SMB2_CHANGE_NOTIFY */ 32,
	/* SMB2_QUERY_INFO */ 41,
	/* SMB2_SET_INFO */ 33,
	/* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
};

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static int encryption_required(const struct cifs_tcon *tcon)
{
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	if (!tcon)
		return 0;
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	if ((tcon->ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) ||
	    (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA))
		return 1;
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	if (tcon->seal &&
	    (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
		return 1;
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	return 0;
}
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static void
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smb2_hdr_assemble(struct smb2_sync_hdr *shdr, __le16 smb2_cmd,
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		  const struct cifs_tcon *tcon)
{
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	shdr->ProtocolId = SMB2_PROTO_NUMBER;
	shdr->StructureSize = cpu_to_le16(64);
	shdr->Command = smb2_cmd;
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	if (tcon && tcon->ses && tcon->ses->server) {
		struct TCP_Server_Info *server = tcon->ses->server;

		spin_lock(&server->req_lock);
		/* Request up to 2 credits but don't go over the limit. */
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		if (server->credits >= server->max_credits)
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			shdr->CreditRequest = cpu_to_le16(0);
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		else
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			shdr->CreditRequest = cpu_to_le16(
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				min_t(int, server->max_credits -
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						server->credits, 2));
		spin_unlock(&server->req_lock);
	} else {
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		shdr->CreditRequest = cpu_to_le16(2);
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	}
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	shdr->ProcessId = cpu_to_le32((__u16)current->tgid);
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	if (!tcon)
		goto out;

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	/* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
	/* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
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	if ((tcon->ses) && (tcon->ses->server) &&
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	    (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
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		shdr->CreditCharge = cpu_to_le16(1);
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	/* else CreditCharge MBZ */

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	shdr->TreeId = tcon->tid;
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	/* Uid is not converted */
	if (tcon->ses)
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		shdr->SessionId = tcon->ses->Suid;
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	/*
	 * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
	 * to pass the path on the Open SMB prefixed by \\server\share.
	 * Not sure when we would need to do the augmented path (if ever) and
	 * setting this flag breaks the SMB2 open operation since it is
	 * illegal to send an empty path name (without \\server\share prefix)
	 * when the DFS flag is set in the SMB open header. We could
	 * consider setting the flag on all operations other than open
	 * but it is safer to net set it for now.
	 */
/*	if (tcon->share_flags & SHI1005_FLAGS_DFS)
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		shdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
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	if (tcon->ses && tcon->ses->server && tcon->ses->server->sign &&
	    !encryption_required(tcon))
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		shdr->Flags |= SMB2_FLAGS_SIGNED;
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out:
	return;
}

static int
smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
{
	int rc = 0;
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	struct nls_table *nls_codepage;
	struct cifs_ses *ses;
	struct TCP_Server_Info *server;

	/*
	 * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
	 * check for tcp and smb session status done differently
	 * for those three - in the calling routine.
	 */
	if (tcon == NULL)
		return rc;

	if (smb2_command == SMB2_TREE_CONNECT)
		return rc;

	if (tcon->tidStatus == CifsExiting) {
		/*
		 * only tree disconnect, open, and write,
		 * (and ulogoff which does not have tcon)
		 * are allowed as we start force umount.
		 */
		if ((smb2_command != SMB2_WRITE) &&
		   (smb2_command != SMB2_CREATE) &&
		   (smb2_command != SMB2_TREE_DISCONNECT)) {
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			cifs_dbg(FYI, "can not send cmd %d while umounting\n",
				 smb2_command);
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			return -ENODEV;
		}
	}
	if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
	    (!tcon->ses->server))
		return -EIO;

	ses = tcon->ses;
	server = ses->server;

	/*
	 * Give demultiplex thread up to 10 seconds to reconnect, should be
	 * greater than cifs socket timeout which is 7 seconds
	 */
	while (server->tcpStatus == CifsNeedReconnect) {
		/*
		 * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
		 * here since they are implicitly done when session drops.
		 */
		switch (smb2_command) {
		/*
		 * BB Should we keep oplock break and add flush to exceptions?
		 */
		case SMB2_TREE_DISCONNECT:
		case SMB2_CANCEL:
		case SMB2_CLOSE:
		case SMB2_OPLOCK_BREAK:
			return -EAGAIN;
		}

		wait_event_interruptible_timeout(server->response_q,
			(server->tcpStatus != CifsNeedReconnect), 10 * HZ);

		/* are we still trying to reconnect? */
		if (server->tcpStatus != CifsNeedReconnect)
			break;

		/*
		 * on "soft" mounts we wait once. Hard mounts keep
		 * retrying until process is killed or server comes
		 * back on-line
		 */
		if (!tcon->retry) {
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			cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
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			return -EHOSTDOWN;
		}
	}

	if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
		return rc;

	nls_codepage = load_nls_default();

	/*
	 * need to prevent multiple threads trying to simultaneously reconnect
	 * the same SMB session
	 */
	mutex_lock(&tcon->ses->session_mutex);
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	/*
	 * Recheck after acquire mutex. If another thread is negotiating
	 * and the server never sends an answer the socket will be closed
	 * and tcpStatus set to reconnect.
	 */
	if (server->tcpStatus == CifsNeedReconnect) {
		rc = -EHOSTDOWN;
		mutex_unlock(&tcon->ses->session_mutex);
		goto out;
	}

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	rc = cifs_negotiate_protocol(0, tcon->ses);
	if (!rc && tcon->ses->need_reconnect)
		rc = cifs_setup_session(0, tcon->ses, nls_codepage);

	if (rc || !tcon->need_reconnect) {
		mutex_unlock(&tcon->ses->session_mutex);
		goto out;
	}

	cifs_mark_open_files_invalid(tcon);
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	if (tcon->use_persistent)
		tcon->need_reopen_files = true;
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	rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nls_codepage);
	mutex_unlock(&tcon->ses->session_mutex);
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	cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
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	if (rc) {
		/* If sess reconnected but tcon didn't, something strange ... */
		printk_once(KERN_WARNING "reconnect tcon failed rc = %d\n", rc);
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		goto out;
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	}
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	if (smb2_command != SMB2_INTERNAL_CMD)
		queue_delayed_work(cifsiod_wq, &server->reconnect, 0);

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	atomic_inc(&tconInfoReconnectCount);
out:
	/*
	 * Check if handle based operation so we know whether we can continue
	 * or not without returning to caller to reset file handle.
	 */
	/*
	 * BB Is flush done by server on drop of tcp session? Should we special
	 * case it and skip above?
	 */
	switch (smb2_command) {
	case SMB2_FLUSH:
	case SMB2_READ:
	case SMB2_WRITE:
	case SMB2_LOCK:
	case SMB2_IOCTL:
	case SMB2_QUERY_DIRECTORY:
	case SMB2_CHANGE_NOTIFY:
	case SMB2_QUERY_INFO:
	case SMB2_SET_INFO:
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		rc = -EAGAIN;
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	}
	unload_nls(nls_codepage);
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	return rc;
}

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static void
fill_small_buf(__le16 smb2_command, struct cifs_tcon *tcon, void *buf,
	       unsigned int *total_len)
{
	struct smb2_sync_pdu *spdu = (struct smb2_sync_pdu *)buf;
	/* lookup word count ie StructureSize from table */
	__u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_command)];

	/*
	 * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
	 * largest operations (Create)
	 */
	memset(buf, 0, 256);

	smb2_hdr_assemble(&spdu->sync_hdr, smb2_command, tcon);
	spdu->StructureSize2 = cpu_to_le16(parmsize);

	*total_len = parmsize + sizeof(struct smb2_sync_hdr);
}

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/*
 * Allocate and return pointer to an SMB request hdr, and set basic
 * SMB information in the SMB header. If the return code is zero, this
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 * function must have filled in request_buf pointer.
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 */
static int
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smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
		    void **request_buf, unsigned int *total_len)
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{
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	int rc;
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	rc = smb2_reconnect(smb2_command, tcon);
	if (rc)
		return rc;

	/* BB eventually switch this to SMB2 specific small buf size */
	*request_buf = cifs_small_buf_get();
	if (*request_buf == NULL) {
		/* BB should we add a retry in here if not a writepage? */
		return -ENOMEM;
	}

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	fill_small_buf(smb2_command, tcon,
		       (struct smb2_sync_hdr *)(*request_buf),
		       total_len);
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	if (tcon != NULL) {
#ifdef CONFIG_CIFS_STATS2
		uint16_t com_code = le16_to_cpu(smb2_command);
		cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
#endif
		cifs_stats_inc(&tcon->num_smbs_sent);
	}

	return rc;
}

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#ifdef CONFIG_CIFS_SMB311
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/* offset is sizeof smb2_negotiate_req but rounded up to 8 bytes */
#define OFFSET_OF_NEG_CONTEXT 0x68  /* sizeof(struct smb2_negotiate_req) */
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#define SMB2_PREAUTH_INTEGRITY_CAPABILITIES	cpu_to_le16(1)
#define SMB2_ENCRYPTION_CAPABILITIES		cpu_to_le16(2)

static void
build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
{
	pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
	pneg_ctxt->DataLength = cpu_to_le16(38);
	pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
	pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE);
	get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE);
	pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
}

static void
build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
{
	pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
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	pneg_ctxt->DataLength = cpu_to_le16(4); /* Cipher Count + le16 cipher */
	pneg_ctxt->CipherCount = cpu_to_le16(1);
/* pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;*/ /* not supported yet */
	pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_CCM;
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}

static void
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assemble_neg_contexts(struct smb2_negotiate_req *req,
		      unsigned int *total_len)
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{
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	char *pneg_ctxt = (char *)req + OFFSET_OF_NEG_CONTEXT;
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	build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
	/* Add 2 to size to round to 8 byte boundary */
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	pneg_ctxt += 2 + sizeof(struct smb2_preauth_neg_context);
	build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
	req->NegotiateContextOffset = cpu_to_le32(OFFSET_OF_NEG_CONTEXT);
	req->NegotiateContextCount = cpu_to_le16(2);
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	*total_len += 4 + sizeof(struct smb2_preauth_neg_context)
		+ sizeof(struct smb2_encryption_neg_context);
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}
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static void decode_preauth_context(struct smb2_preauth_neg_context *ctxt)
{
	unsigned int len = le16_to_cpu(ctxt->DataLength);

	/* If invalid preauth context warn but use what we requested, SHA-512 */
	if (len < MIN_PREAUTH_CTXT_DATA_LEN) {
		printk_once(KERN_WARNING "server sent bad preauth context\n");
		return;
	}
	if (le16_to_cpu(ctxt->HashAlgorithmCount) != 1)
		printk_once(KERN_WARNING "illegal SMB3 hash algorithm count\n");
	if (ctxt->HashAlgorithms != SMB2_PREAUTH_INTEGRITY_SHA512)
		printk_once(KERN_WARNING "unknown SMB3 hash algorithm\n");
}

static int decode_encrypt_ctx(struct TCP_Server_Info *server,
			      struct smb2_encryption_neg_context *ctxt)
{
	unsigned int len = le16_to_cpu(ctxt->DataLength);

	cifs_dbg(FYI, "decode SMB3.11 encryption neg context of len %d\n", len);
	if (len < MIN_ENCRYPT_CTXT_DATA_LEN) {
		printk_once(KERN_WARNING "server sent bad crypto ctxt len\n");
		return -EINVAL;
	}

	if (le16_to_cpu(ctxt->CipherCount) != 1) {
		printk_once(KERN_WARNING "illegal SMB3.11 cipher count\n");
		return -EINVAL;
	}
	cifs_dbg(FYI, "SMB311 cipher type:%d\n", le16_to_cpu(ctxt->Ciphers[0]));
	if ((ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_CCM) &&
	    (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_GCM)) {
		printk_once(KERN_WARNING "invalid SMB3.11 cipher returned\n");
		return -EINVAL;
	}
	server->cipher_type = ctxt->Ciphers[0];
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	server->capabilities |= SMB2_GLOBAL_CAP_ENCRYPTION;
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	return 0;
}

static int smb311_decode_neg_context(struct smb2_negotiate_rsp *rsp,
				     struct TCP_Server_Info *server)
{
	struct smb2_neg_context *pctx;
	unsigned int offset = le32_to_cpu(rsp->NegotiateContextOffset);
	unsigned int ctxt_cnt = le16_to_cpu(rsp->NegotiateContextCount);
	unsigned int len_of_smb = be32_to_cpu(rsp->hdr.smb2_buf_length);
	unsigned int len_of_ctxts, i;
	int rc = 0;

	cifs_dbg(FYI, "decoding %d negotiate contexts\n", ctxt_cnt);
	if (len_of_smb <= offset) {
		cifs_dbg(VFS, "Invalid response: negotiate context offset\n");
		return -EINVAL;
	}

	len_of_ctxts = len_of_smb - offset;

	for (i = 0; i < ctxt_cnt; i++) {
		int clen;
		/* check that offset is not beyond end of SMB */
		if (len_of_ctxts == 0)
			break;

		if (len_of_ctxts < sizeof(struct smb2_neg_context))
			break;

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		pctx = (struct smb2_neg_context *)(offset +
			server->vals->header_preamble_size + (char *)rsp);
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		clen = le16_to_cpu(pctx->DataLength);
		if (clen > len_of_ctxts)
			break;

		if (pctx->ContextType == SMB2_PREAUTH_INTEGRITY_CAPABILITIES)
			decode_preauth_context(
				(struct smb2_preauth_neg_context *)pctx);
		else if (pctx->ContextType == SMB2_ENCRYPTION_CAPABILITIES)
			rc = decode_encrypt_ctx(server,
				(struct smb2_encryption_neg_context *)pctx);
		else
			cifs_dbg(VFS, "unknown negcontext of type %d ignored\n",
				le16_to_cpu(pctx->ContextType));

		if (rc)
			break;
		/* offsets must be 8 byte aligned */
		clen = (clen + 7) & ~0x7;
		offset += clen + sizeof(struct smb2_neg_context);
		len_of_ctxts -= clen;
	}
	return rc;
}

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#else
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static void assemble_neg_contexts(struct smb2_negotiate_req *req,
				  unsigned int *total_len)
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{
	return;
}
#endif /* SMB311 */

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/*
 *
 *	SMB2 Worker functions follow:
 *
 *	The general structure of the worker functions is:
 *	1) Call smb2_init (assembles SMB2 header)
 *	2) Initialize SMB2 command specific fields in fixed length area of SMB
 *	3) Call smb_sendrcv2 (sends request on socket and waits for response)
 *	4) Decode SMB2 command specific fields in the fixed length area
 *	5) Decode variable length data area (if any for this SMB2 command type)
 *	6) Call free smb buffer
 *	7) return
 *
 */

int
SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
{
	struct smb2_negotiate_req *req;
	struct smb2_negotiate_rsp *rsp;
	struct kvec iov[1];
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	struct kvec rsp_iov;
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	int rc = 0;
	int resp_buftype;
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	struct TCP_Server_Info *server = ses->server;
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	int blob_offset, blob_length;
	char *security_blob;
	int flags = CIFS_NEG_OP;
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	unsigned int total_len;
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	cifs_dbg(FYI, "Negotiate protocol\n");
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	if (!server) {
		WARN(1, "%s: server is NULL!\n", __func__);
		return -EIO;
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	}

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	rc = smb2_plain_req_init(SMB2_NEGOTIATE, NULL, (void **) &req, &total_len);
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	if (rc)
		return rc;

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	req->sync_hdr.SessionId = 0;
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#ifdef CONFIG_CIFS_SMB311
	memset(server->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
	memset(ses->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
#endif
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	if (strcmp(ses->server->vals->version_string,
		   SMB3ANY_VERSION_STRING) == 0) {
		req->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
		req->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
		req->DialectCount = cpu_to_le16(2);
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		total_len += 4;
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	} else if (strcmp(ses->server->vals->version_string,
		   SMBDEFAULT_VERSION_STRING) == 0) {
		req->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
		req->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
		req->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
		req->DialectCount = cpu_to_le16(3);
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		total_len += 6;
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	} else {
		/* otherwise send specific dialect */
		req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
		req->DialectCount = cpu_to_le16(1);
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		total_len += 2;
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	}
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	/* only one of SMB2 signing flags may be set in SMB2 request */
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	if (ses->sign)
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		req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
582
	else if (global_secflags & CIFSSEC_MAY_SIGN)
583
		req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
584 585
	else
		req->SecurityMode = 0;
586

587
	req->Capabilities = cpu_to_le32(ses->server->vals->req_capabilities);
588

589 590 591
	/* ClientGUID must be zero for SMB2.02 dialect */
	if (ses->server->vals->protocol_id == SMB20_PROT_ID)
		memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
592
	else {
593 594
		memcpy(req->ClientGUID, server->client_guid,
			SMB2_CLIENT_GUID_SIZE);
595
		if (ses->server->vals->protocol_id == SMB311_PROT_ID)
596
			assemble_neg_contexts(req, &total_len);
597
	}
598
	iov[0].iov_base = (char *)req;
599
	iov[0].iov_len = total_len;
600

601
	rc = smb2_send_recv(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
602 603
	cifs_small_buf_release(req);
	rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base;
604 605 606 607
	/*
	 * No tcon so can't do
	 * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
	 */
608 609
	if (rc == -EOPNOTSUPP) {
		cifs_dbg(VFS, "Dialect not supported by server. Consider "
610
			"specifying vers=1.0 or vers=2.0 on mount for accessing"
611 612 613
			" older servers\n");
		goto neg_exit;
	} else if (rc != 0)
614 615
		goto neg_exit;

616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636
	if (strcmp(ses->server->vals->version_string,
		   SMB3ANY_VERSION_STRING) == 0) {
		if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
			cifs_dbg(VFS,
				"SMB2 dialect returned but not requested\n");
			return -EIO;
		} else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
			cifs_dbg(VFS,
				"SMB2.1 dialect returned but not requested\n");
			return -EIO;
		}
	} else if (strcmp(ses->server->vals->version_string,
		   SMBDEFAULT_VERSION_STRING) == 0) {
		if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
			cifs_dbg(VFS,
				"SMB2 dialect returned but not requested\n");
			return -EIO;
		} else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
			/* ops set to 3.0 by default for default so update */
			ses->server->ops = &smb21_operations;
		}
S
Steve French 已提交
637 638
	} else if (le16_to_cpu(rsp->DialectRevision) !=
				ses->server->vals->protocol_id) {
639 640
		/* if requested single dialect ensure returned dialect matched */
		cifs_dbg(VFS, "Illegal 0x%x dialect returned: not requested\n",
S
Steve French 已提交
641
			le16_to_cpu(rsp->DialectRevision));
642 643 644
		return -EIO;
	}

645
	cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
646

647
	if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
648
		cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
649
	else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
650
		cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
651
	else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
652
		cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
S
Steve French 已提交
653 654
	else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
		cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
655 656 657 658
#ifdef CONFIG_CIFS_SMB311
	else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
		cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
#endif /* SMB311 */
659
	else {
660
		cifs_dbg(VFS, "Illegal dialect returned by server 0x%x\n",
661
			 le16_to_cpu(rsp->DialectRevision));
662 663 664 665 666
		rc = -EIO;
		goto neg_exit;
	}
	server->dialect = le16_to_cpu(rsp->DialectRevision);

667 668
	/* BB: add check that dialect was valid given dialect(s) we asked for */

669 670 671 672 673 674 675 676 677
#ifdef CONFIG_CIFS_SMB311
	/*
	 * Keep a copy of the hash after negprot. This hash will be
	 * the starting hash value for all sessions made from this
	 * server.
	 */
	memcpy(server->preauth_sha_hash, ses->preauth_sha_hash,
	       SMB2_PREAUTH_HASH_SIZE);
#endif
678 679
	/* SMB2 only has an extended negflavor */
	server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
680 681 682
	/* set it to the maximum buffer size value we can send with 1 credit */
	server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
			       SMB2_MAX_BUFFER_SIZE);
683 684 685
	server->max_read = le32_to_cpu(rsp->MaxReadSize);
	server->max_write = le32_to_cpu(rsp->MaxWriteSize);
	server->sec_mode = le16_to_cpu(rsp->SecurityMode);
686 687 688
	if ((server->sec_mode & SMB2_SEC_MODE_FLAGS_ALL) != server->sec_mode)
		cifs_dbg(FYI, "Server returned unexpected security mode 0x%x\n",
				server->sec_mode);
689
	server->capabilities = le32_to_cpu(rsp->Capabilities);
690 691
	/* Internal types */
	server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
692 693 694

	security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
					       &rsp->hdr);
695 696 697 698 699 700 701
	/*
	 * See MS-SMB2 section 2.2.4: if no blob, client picks default which
	 * for us will be
	 *	ses->sectype = RawNTLMSSP;
	 * but for time being this is our only auth choice so doesn't matter.
	 * We just found a server which sets blob length to zero expecting raw.
	 */
702
	if (blob_length == 0) {
703
		cifs_dbg(FYI, "missing security blob on negprot\n");
704 705
		server->sec_ntlmssp = true;
	}
P
Pavel Shilovsky 已提交
706

707
	rc = cifs_enable_signing(server, ses->sign);
708 709
	if (rc)
		goto neg_exit;
710
	if (blob_length) {
711
		rc = decode_negTokenInit(security_blob, blob_length, server);
712 713 714 715
		if (rc == 1)
			rc = 0;
		else if (rc == 0)
			rc = -EIO;
716
	}
717 718 719 720 721 722 723 724 725

#ifdef CONFIG_CIFS_SMB311
	if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
		if (rsp->NegotiateContextCount)
			rc = smb311_decode_neg_context(rsp, server);
		else
			cifs_dbg(VFS, "Missing expected negotiate contexts\n");
	}
#endif /* CONFIG_CIFS_SMB311 */
726 727 728 729
neg_exit:
	free_rsp_buf(resp_buftype, rsp);
	return rc;
}
730

731 732
int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
{
733 734
	int rc;
	struct validate_negotiate_info_req *pneg_inbuf;
735
	struct validate_negotiate_info_rsp *pneg_rsp = NULL;
736
	u32 rsplen;
737
	u32 inbuflen; /* max of 4 dialects */
738 739 740

	cifs_dbg(FYI, "validate negotiate\n");

741 742 743 744
	/* In SMB3.11 preauth integrity supersedes validate negotiate */
	if (tcon->ses->server->dialect == SMB311_PROT_ID)
		return 0;

745 746
	/*
	 * validation ioctl must be signed, so no point sending this if we
747 748
	 * can not sign it (ie are not known user).  Even if signing is not
	 * required (enabled but not negotiated), in those cases we selectively
749
	 * sign just this, the first and only signed request on a connection.
750
	 * Having validation of negotiate info  helps reduce attack vectors.
751
	 */
752
	if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
753 754
		return 0; /* validation requires signing */

755 756 757 758 759 760 761 762
	if (tcon->ses->user_name == NULL) {
		cifs_dbg(FYI, "Can't validate negotiate: null user mount\n");
		return 0; /* validation requires signing */
	}

	if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)
		cifs_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n");

763 764 765 766 767
	pneg_inbuf = kmalloc(sizeof(*pneg_inbuf), GFP_NOFS);
	if (!pneg_inbuf)
		return -ENOMEM;

	pneg_inbuf->Capabilities =
768
			cpu_to_le32(tcon->ses->server->vals->req_capabilities);
769
	memcpy(pneg_inbuf->Guid, tcon->ses->server->client_guid,
770
					SMB2_CLIENT_GUID_SIZE);
771 772

	if (tcon->ses->sign)
773
		pneg_inbuf->SecurityMode =
774 775
			cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
	else if (global_secflags & CIFSSEC_MAY_SIGN)
776
		pneg_inbuf->SecurityMode =
777 778
			cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
	else
779
		pneg_inbuf->SecurityMode = 0;
780

781 782 783

	if (strcmp(tcon->ses->server->vals->version_string,
		SMB3ANY_VERSION_STRING) == 0) {
784 785 786
		pneg_inbuf->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
		pneg_inbuf->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
		pneg_inbuf->DialectCount = cpu_to_le16(2);
787
		/* structure is big enough for 3 dialects, sending only 2 */
788 789
		inbuflen = sizeof(*pneg_inbuf) -
				sizeof(pneg_inbuf->Dialects[0]);
790 791
	} else if (strcmp(tcon->ses->server->vals->version_string,
		SMBDEFAULT_VERSION_STRING) == 0) {
792 793 794 795
		pneg_inbuf->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
		pneg_inbuf->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
		pneg_inbuf->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
		pneg_inbuf->DialectCount = cpu_to_le16(3);
796
		/* structure is big enough for 3 dialects */
797
		inbuflen = sizeof(*pneg_inbuf);
798 799
	} else {
		/* otherwise specific dialect was requested */
800
		pneg_inbuf->Dialects[0] =
801
			cpu_to_le16(tcon->ses->server->vals->protocol_id);
802
		pneg_inbuf->DialectCount = cpu_to_le16(1);
803
		/* structure is big enough for 3 dialects, sending only 1 */
804 805
		inbuflen = sizeof(*pneg_inbuf) -
				sizeof(pneg_inbuf->Dialects[0]) * 2;
806
	}
807 808 809

	rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
		FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
810
		(char *)pneg_inbuf, inbuflen, (char **)&pneg_rsp, &rsplen);
811 812 813

	if (rc != 0) {
		cifs_dbg(VFS, "validate protocol negotiate failed: %d\n", rc);
814 815
		rc = -EIO;
		goto out_free_inbuf;
816 817
	}

818 819
	rc = -EIO;
	if (rsplen != sizeof(*pneg_rsp)) {
820 821 822 823
		cifs_dbg(VFS, "invalid protocol negotiate response size: %d\n",
			 rsplen);

		/* relax check since Mac returns max bufsize allowed on ioctl */
824 825
		if (rsplen > CIFSMaxBufSize || rsplen < sizeof(*pneg_rsp))
			goto out_free_rsp;
826 827 828
	}

	/* check validate negotiate info response matches what we got earlier */
829
	if (pneg_rsp->Dialect != cpu_to_le16(tcon->ses->server->dialect))
830 831 832 833 834 835 836 837 838 839 840 841
		goto vneg_out;

	if (pneg_rsp->SecurityMode != cpu_to_le16(tcon->ses->server->sec_mode))
		goto vneg_out;

	/* do not validate server guid because not saved at negprot time yet */

	if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
	      SMB2_LARGE_FILES) != tcon->ses->server->capabilities)
		goto vneg_out;

	/* validate negotiate successful */
842
	rc = 0;
843
	cifs_dbg(FYI, "validate negotiate info successful\n");
844
	goto out_free_rsp;
845 846 847

vneg_out:
	cifs_dbg(VFS, "protocol revalidation - security settings mismatch\n");
848
out_free_rsp:
849
	kfree(pneg_rsp);
850 851 852
out_free_inbuf:
	kfree(pneg_inbuf);
	return rc;
853 854
}

S
Sachin Prabhu 已提交
855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876
enum securityEnum
smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
{
	switch (requested) {
	case Kerberos:
	case RawNTLMSSP:
		return requested;
	case NTLMv2:
		return RawNTLMSSP;
	case Unspecified:
		if (server->sec_ntlmssp &&
			(global_secflags & CIFSSEC_MAY_NTLMSSP))
			return RawNTLMSSP;
		if ((server->sec_kerberos || server->sec_mskerberos) &&
			(global_secflags & CIFSSEC_MAY_KRB5))
			return Kerberos;
		/* Fallthrough */
	default:
		return Unspecified;
	}
}

877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902
struct SMB2_sess_data {
	unsigned int xid;
	struct cifs_ses *ses;
	struct nls_table *nls_cp;
	void (*func)(struct SMB2_sess_data *);
	int result;
	u64 previous_session;

	/* we will send the SMB in three pieces:
	 * a fixed length beginning part, an optional
	 * SPNEGO blob (which can be zero length), and a
	 * last part which will include the strings
	 * and rest of bcc area. This allows us to avoid
	 * a large buffer 17K allocation
	 */
	int buf0_type;
	struct kvec iov[2];
};

static int
SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
{
	int rc;
	struct cifs_ses *ses = sess_data->ses;
	struct smb2_sess_setup_req *req;
	struct TCP_Server_Info *server = ses->server;
903
	unsigned int total_len;
904

905 906
	rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, (void **) &req,
			     &total_len);
907 908 909
	if (rc)
		return rc;

910
	/* First session, not a reauthenticate */
911
	req->sync_hdr.SessionId = 0;
912 913 914 915 916 917

	/* if reconnect, we need to send previous sess id, otherwise it is 0 */
	req->PreviousSessionId = sess_data->previous_session;

	req->Flags = 0; /* MBZ */
	/* to enable echos and oplocks */
918
	req->sync_hdr.CreditRequest = cpu_to_le16(3);
919 920 921 922 923 924 925 926 927 928 929 930 931

	/* only one of SMB2 signing flags may be set in SMB2 request */
	if (server->sign)
		req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
	else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
		req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
	else
		req->SecurityMode = 0;

	req->Capabilities = 0;
	req->Channel = 0; /* MBZ */

	sess_data->iov[0].iov_base = (char *)req;
932 933
	/* 1 for pad */
	sess_data->iov[0].iov_len = total_len - 1;
934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954
	/*
	 * This variable will be used to clear the buffer
	 * allocated above in case of any error in the calling function.
	 */
	sess_data->buf0_type = CIFS_SMALL_BUFFER;

	return 0;
}

static void
SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)
{
	free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
	sess_data->buf0_type = CIFS_NO_BUFFER;
}

static int
SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
{
	int rc;
	struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
955
	struct kvec rsp_iov = { NULL, 0 };
956 957 958

	/* Testing shows that buffer offset must be at location of Buffer[0] */
	req->SecurityBufferOffset =
959
		cpu_to_le16(sizeof(struct smb2_sess_setup_req) - 1 /* pad */);
960 961 962 963
	req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);

	/* BB add code to build os and lm fields */

964 965 966 967
	rc = smb2_send_recv(sess_data->xid, sess_data->ses,
			    sess_data->iov, 2,
			    &sess_data->buf0_type,
			    CIFS_LOG_ERROR | CIFS_NEG_OP, &rsp_iov);
968 969
	cifs_small_buf_release(sess_data->iov[0].iov_base);
	memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
970 971 972 973 974 975 976 977 978 979 980

	return rc;
}

static int
SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)
{
	int rc = 0;
	struct cifs_ses *ses = sess_data->ses;

	mutex_lock(&ses->server->srv_mutex);
981
	if (ses->server->ops->generate_signingkey) {
982 983 984 985 986
		rc = ses->server->ops->generate_signingkey(ses);
		if (rc) {
			cifs_dbg(FYI,
				"SMB3 session key generation failed\n");
			mutex_unlock(&ses->server->srv_mutex);
987
			return rc;
988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056
		}
	}
	if (!ses->server->session_estab) {
		ses->server->sequence_number = 0x2;
		ses->server->session_estab = true;
	}
	mutex_unlock(&ses->server->srv_mutex);

	cifs_dbg(FYI, "SMB2/3 session established successfully\n");
	spin_lock(&GlobalMid_Lock);
	ses->status = CifsGood;
	ses->need_reconnect = false;
	spin_unlock(&GlobalMid_Lock);
	return rc;
}

#ifdef CONFIG_CIFS_UPCALL
static void
SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
{
	int rc;
	struct cifs_ses *ses = sess_data->ses;
	struct cifs_spnego_msg *msg;
	struct key *spnego_key = NULL;
	struct smb2_sess_setup_rsp *rsp = NULL;

	rc = SMB2_sess_alloc_buffer(sess_data);
	if (rc)
		goto out;

	spnego_key = cifs_get_spnego_key(ses);
	if (IS_ERR(spnego_key)) {
		rc = PTR_ERR(spnego_key);
		spnego_key = NULL;
		goto out;
	}

	msg = spnego_key->payload.data[0];
	/*
	 * check version field to make sure that cifs.upcall is
	 * sending us a response in an expected form
	 */
	if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
		cifs_dbg(VFS,
			  "bad cifs.upcall version. Expected %d got %d",
			  CIFS_SPNEGO_UPCALL_VERSION, msg->version);
		rc = -EKEYREJECTED;
		goto out_put_spnego_key;
	}

	ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
					 GFP_KERNEL);
	if (!ses->auth_key.response) {
		cifs_dbg(VFS,
			"Kerberos can't allocate (%u bytes) memory",
			msg->sesskey_len);
		rc = -ENOMEM;
		goto out_put_spnego_key;
	}
	ses->auth_key.len = msg->sesskey_len;

	sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
	sess_data->iov[1].iov_len = msg->secblob_len;

	rc = SMB2_sess_sendreceive(sess_data);
	if (rc)
		goto out_put_spnego_key;

	rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1057
	ses->Suid = rsp->hdr.sync_hdr.SessionId;
1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079

	ses->session_flags = le16_to_cpu(rsp->SessionFlags);

	rc = SMB2_sess_establish_session(sess_data);
out_put_spnego_key:
	key_invalidate(spnego_key);
	key_put(spnego_key);
out:
	sess_data->result = rc;
	sess_data->func = NULL;
	SMB2_sess_free_buffer(sess_data);
}
#else
static void
SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
{
	cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
	sess_data->result = -EOPNOTSUPP;
	sess_data->func = NULL;
}
#endif

1080 1081 1082 1083 1084
static void
SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);

static void
SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
1085
{
1086 1087
	int rc;
	struct cifs_ses *ses = sess_data->ses;
1088
	struct smb2_sess_setup_rsp *rsp = NULL;
1089
	char *ntlmssp_blob = NULL;
1090
	bool use_spnego = false; /* else use raw ntlmssp */
1091
	u16 blob_length = 0;
1092

1093 1094 1095 1096 1097
	/*
	 * If memory allocation is successful, caller of this function
	 * frees it.
	 */
	ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1098 1099 1100 1101
	if (!ses->ntlmssp) {
		rc = -ENOMEM;
		goto out_err;
	}
1102
	ses->ntlmssp->sesskey_per_smbsess = true;
1103

1104
	rc = SMB2_sess_alloc_buffer(sess_data);
1105
	if (rc)
1106
		goto out_err;
1107

1108 1109 1110 1111 1112 1113
	ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
			       GFP_KERNEL);
	if (ntlmssp_blob == NULL) {
		rc = -ENOMEM;
		goto out;
	}
1114

1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126
	build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
	if (use_spnego) {
		/* BB eventually need to add this */
		cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
		rc = -EOPNOTSUPP;
		goto out;
	} else {
		blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
		/* with raw NTLMSSP we don't encapsulate in SPNEGO */
	}
	sess_data->iov[1].iov_base = ntlmssp_blob;
	sess_data->iov[1].iov_len = blob_length;
1127

1128 1129
	rc = SMB2_sess_sendreceive(sess_data);
	rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1130

1131 1132
	/* If true, rc here is expected and not an error */
	if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1133
		rsp->hdr.sync_hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
1134
		rc = 0;
1135

1136 1137
	if (rc)
		goto out;
1138

1139
	if (offsetof(struct smb2_sess_setup_rsp, Buffer) - ses->server->vals->header_preamble_size !=
1140 1141 1142
			le16_to_cpu(rsp->SecurityBufferOffset)) {
		cifs_dbg(VFS, "Invalid security buffer offset %d\n",
			le16_to_cpu(rsp->SecurityBufferOffset));
1143
		rc = -EIO;
1144
		goto out;
1145
	}
1146 1147 1148 1149
	rc = decode_ntlmssp_challenge(rsp->Buffer,
			le16_to_cpu(rsp->SecurityBufferLength), ses);
	if (rc)
		goto out;
1150

1151
	cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1152 1153


1154
	ses->Suid = rsp->hdr.sync_hdr.SessionId;
1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170
	ses->session_flags = le16_to_cpu(rsp->SessionFlags);

out:
	kfree(ntlmssp_blob);
	SMB2_sess_free_buffer(sess_data);
	if (!rc) {
		sess_data->result = 0;
		sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
		return;
	}
out_err:
	kfree(ses->ntlmssp);
	ses->ntlmssp = NULL;
	sess_data->result = rc;
	sess_data->func = NULL;
}
1171

1172 1173 1174 1175 1176 1177 1178 1179 1180 1181
static void
SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
{
	int rc;
	struct cifs_ses *ses = sess_data->ses;
	struct smb2_sess_setup_req *req;
	struct smb2_sess_setup_rsp *rsp = NULL;
	unsigned char *ntlmssp_blob = NULL;
	bool use_spnego = false; /* else use raw ntlmssp */
	u16 blob_length = 0;
1182

1183 1184 1185
	rc = SMB2_sess_alloc_buffer(sess_data);
	if (rc)
		goto out;
1186

1187
	req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
1188
	req->sync_hdr.SessionId = ses->Suid;
1189 1190 1191 1192 1193 1194

	rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length, ses,
					sess_data->nls_cp);
	if (rc) {
		cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
		goto out;
1195 1196
	}

1197 1198 1199 1200 1201 1202 1203 1204
	if (use_spnego) {
		/* BB eventually need to add this */
		cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
		rc = -EOPNOTSUPP;
		goto out;
	}
	sess_data->iov[1].iov_base = ntlmssp_blob;
	sess_data->iov[1].iov_len = blob_length;
1205

1206 1207 1208 1209 1210 1211
	rc = SMB2_sess_sendreceive(sess_data);
	if (rc)
		goto out;

	rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;

1212
	ses->Suid = rsp->hdr.sync_hdr.SessionId;
1213 1214
	ses->session_flags = le16_to_cpu(rsp->SessionFlags);

1215 1216 1217 1218 1219 1220 1221 1222 1223
	rc = SMB2_sess_establish_session(sess_data);
out:
	kfree(ntlmssp_blob);
	SMB2_sess_free_buffer(sess_data);
	kfree(ses->ntlmssp);
	ses->ntlmssp = NULL;
	sess_data->result = rc;
	sess_data->func = NULL;
}
1224

1225 1226 1227
static int
SMB2_select_sec(struct cifs_ses *ses, struct SMB2_sess_data *sess_data)
{
S
Sachin Prabhu 已提交
1228 1229 1230 1231 1232 1233 1234 1235 1236
	int type;

	type = smb2_select_sectype(ses->server, ses->sectype);
	cifs_dbg(FYI, "sess setup type %d\n", type);
	if (type == Unspecified) {
		cifs_dbg(VFS,
			"Unable to select appropriate authentication method!");
		return -EINVAL;
	}
1237

S
Sachin Prabhu 已提交
1238
	switch (type) {
1239 1240 1241 1242 1243 1244 1245
	case Kerberos:
		sess_data->func = SMB2_auth_kerberos;
		break;
	case RawNTLMSSP:
		sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
		break;
	default:
S
Sachin Prabhu 已提交
1246
		cifs_dbg(VFS, "secType %d not supported!\n", type);
1247
		return -EOPNOTSUPP;
1248 1249
	}

1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265
	return 0;
}

int
SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
		const struct nls_table *nls_cp)
{
	int rc = 0;
	struct TCP_Server_Info *server = ses->server;
	struct SMB2_sess_data *sess_data;

	cifs_dbg(FYI, "Session Setup\n");

	if (!server) {
		WARN(1, "%s: server is NULL!\n", __func__);
		return -EIO;
1266 1267
	}

1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279
	sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
	if (!sess_data)
		return -ENOMEM;

	rc = SMB2_select_sec(ses, sess_data);
	if (rc)
		goto out;
	sess_data->xid = xid;
	sess_data->ses = ses;
	sess_data->buf0_type = CIFS_NO_BUFFER;
	sess_data->nls_cp = (struct nls_table *) nls_cp;

1280 1281 1282 1283 1284 1285 1286 1287
#ifdef CONFIG_CIFS_SMB311
	/*
	 * Initialize the session hash with the server one.
	 */
	memcpy(ses->preauth_sha_hash, ses->server->preauth_sha_hash,
	       SMB2_PREAUTH_HASH_SIZE);
#endif

1288 1289 1290
	while (sess_data->func)
		sess_data->func(sess_data);

1291 1292
	if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign))
		cifs_dbg(VFS, "signing requested but authenticated as guest\n");
1293
	rc = sess_data->result;
1294
out:
1295
	kfree(sess_data);
1296 1297 1298 1299 1300 1301 1302 1303 1304
	return rc;
}

int
SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
{
	struct smb2_logoff_req *req; /* response is also trivial struct */
	int rc = 0;
	struct TCP_Server_Info *server;
1305
	int flags = 0;
1306 1307 1308 1309
	unsigned int total_len;
	struct kvec iov[1];
	struct kvec rsp_iov;
	int resp_buf_type;
1310

1311
	cifs_dbg(FYI, "disconnect session %p\n", ses);
1312 1313 1314 1315 1316 1317

	if (ses && (ses->server))
		server = ses->server;
	else
		return -EIO;

1318 1319 1320 1321
	/* no need to send SMB logoff if uid already closed due to reconnect */
	if (ses->need_reconnect)
		goto smb2_session_already_dead;

1322
	rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, (void **) &req, &total_len);
1323 1324 1325 1326
	if (rc)
		return rc;

	 /* since no tcon, smb2_init can not do this, so do here */
1327
	req->sync_hdr.SessionId = ses->Suid;
1328 1329 1330 1331

	if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
		flags |= CIFS_TRANSFORM_REQ;
	else if (server->sign)
1332 1333 1334 1335 1336 1337
		req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;

	flags |= CIFS_NO_RESP;

	iov[0].iov_base = (char *)req;
	iov[0].iov_len = total_len;
1338

1339
	rc = smb2_send_recv(xid, ses, iov, 1, &resp_buf_type, flags, &rsp_iov);
1340
	cifs_small_buf_release(req);
1341 1342 1343 1344
	/*
	 * No tcon so can't do
	 * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
	 */
1345 1346

smb2_session_already_dead:
1347 1348
	return rc;
}
1349 1350 1351

static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
{
1352
	cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
1353 1354 1355 1356
}

#define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)

S
Steve French 已提交
1357 1358 1359 1360 1361 1362 1363 1364
/* These are similar values to what Windows uses */
static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
{
	tcon->max_chunks = 256;
	tcon->max_bytes_chunk = 1048576;
	tcon->max_bytes_copy = 16777216;
}

1365 1366 1367 1368 1369 1370 1371
int
SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
	  struct cifs_tcon *tcon, const struct nls_table *cp)
{
	struct smb2_tree_connect_req *req;
	struct smb2_tree_connect_rsp *rsp = NULL;
	struct kvec iov[2];
1372
	struct kvec rsp_iov = { NULL, 0 };
1373 1374 1375 1376
	int rc = 0;
	int resp_buftype;
	int unc_path_len;
	__le16 *unc_path = NULL;
1377
	int flags = 0;
1378
	unsigned int total_len;
1379

1380
	cifs_dbg(FYI, "TCON\n");
1381

1382
	if (!(ses->server) || !tree)
1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395
		return -EIO;

	unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
	if (unc_path == NULL)
		return -ENOMEM;

	unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
	unc_path_len *= 2;
	if (unc_path_len < 2) {
		kfree(unc_path);
		return -EINVAL;
	}

1396
	/* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
A
Aurelien Aptel 已提交
1397
	tcon->tid = 0;
1398

1399 1400
	rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, (void **) &req,
			     &total_len);
1401 1402 1403 1404 1405
	if (rc) {
		kfree(unc_path);
		return rc;
	}

A
Aurelien Aptel 已提交
1406
	if (encryption_required(tcon))
1407
		flags |= CIFS_TRANSFORM_REQ;
1408 1409

	iov[0].iov_base = (char *)req;
1410 1411
	/* 1 for pad */
	iov[0].iov_len = total_len - 1;
1412 1413 1414

	/* Testing shows that buffer offset must be at location of Buffer[0] */
	req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
1415
			- 1 /* pad */);
1416 1417 1418 1419
	req->PathLength = cpu_to_le16(unc_path_len - 2);
	iov[1].iov_base = unc_path;
	iov[1].iov_len = unc_path_len;

1420 1421 1422 1423 1424
	/* 3.11 tcon req must be signed if not encrypted. See MS-SMB2 3.2.4.1.1 */
	if ((ses->server->dialect == SMB311_PROT_ID) &&
	    !encryption_required(tcon))
		req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;

1425
	rc = smb2_send_recv(xid, ses, iov, 2, &resp_buftype, flags, &rsp_iov);
1426 1427
	cifs_small_buf_release(req);
	rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
1428 1429 1430 1431 1432 1433 1434 1435 1436

	if (rc != 0) {
		if (tcon) {
			cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
			tcon->need_reconnect = true;
		}
		goto tcon_error_exit;
	}

1437 1438
	switch (rsp->ShareType) {
	case SMB2_SHARE_TYPE_DISK:
1439
		cifs_dbg(FYI, "connection to disk share\n");
1440 1441
		break;
	case SMB2_SHARE_TYPE_PIPE:
A
Aurelien Aptel 已提交
1442
		tcon->pipe = true;
1443
		cifs_dbg(FYI, "connection to pipe share\n");
1444 1445
		break;
	case SMB2_SHARE_TYPE_PRINT:
A
Aurelien Aptel 已提交
1446
		tcon->print = true;
1447
		cifs_dbg(FYI, "connection to printer\n");
1448 1449
		break;
	default:
1450
		cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
1451 1452 1453 1454 1455
		rc = -EOPNOTSUPP;
		goto tcon_error_exit;
	}

	tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
1456
	tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
1457 1458 1459
	tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
	tcon->tidStatus = CifsGood;
	tcon->need_reconnect = false;
1460
	tcon->tid = rsp->hdr.sync_hdr.TreeId;
1461
	strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
1462 1463 1464

	if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
	    ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
1465
		cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
1466 1467 1468 1469 1470

	if (tcon->seal &&
	    !(tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
		cifs_dbg(VFS, "Encryption is requested but not supported\n");

S
Steve French 已提交
1471
	init_copy_chunk_defaults(tcon);
1472 1473
	if (tcon->ses->server->ops->validate_negotiate)
		rc = tcon->ses->server->ops->validate_negotiate(xid, tcon);
1474 1475 1476 1477 1478 1479
tcon_exit:
	free_rsp_buf(resp_buftype, rsp);
	kfree(unc_path);
	return rc;

tcon_error_exit:
1480
	if (rsp && rsp->hdr.sync_hdr.Status == STATUS_BAD_NETWORK_NAME) {
1481
		cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1482 1483 1484 1485 1486 1487 1488 1489 1490 1491
	}
	goto tcon_exit;
}

int
SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
{
	struct smb2_tree_disconnect_req *req; /* response is trivial */
	int rc = 0;
	struct cifs_ses *ses = tcon->ses;
1492
	int flags = 0;
1493 1494 1495 1496
	unsigned int total_len;
	struct kvec iov[1];
	struct kvec rsp_iov;
	int resp_buf_type;
1497

1498
	cifs_dbg(FYI, "Tree Disconnect\n");
1499

1500
	if (!ses || !(ses->server))
1501 1502 1503 1504 1505
		return -EIO;

	if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
		return 0;

1506 1507
	rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req,
			     &total_len);
1508 1509 1510
	if (rc)
		return rc;

1511 1512 1513
	if (encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

1514 1515 1516 1517 1518 1519
	flags |= CIFS_NO_RESP;

	iov[0].iov_base = (char *)req;
	iov[0].iov_len = total_len;

	rc = smb2_send_recv(xid, ses, iov, 1, &resp_buf_type, flags, &rsp_iov);
1520
	cifs_small_buf_release(req);
1521 1522 1523 1524 1525
	if (rc)
		cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);

	return rc;
}
1526

P
Pavel Shilovsky 已提交
1527

1528 1529 1530 1531 1532 1533 1534 1535 1536 1537
static struct create_durable *
create_durable_buf(void)
{
	struct create_durable *buf;

	buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
	if (!buf)
		return NULL;

	buf->ccontext.DataOffset = cpu_to_le16(offsetof
1538
					(struct create_durable, Data));
1539 1540 1541 1542
	buf->ccontext.DataLength = cpu_to_le32(16);
	buf->ccontext.NameOffset = cpu_to_le16(offsetof
				(struct create_durable, Name));
	buf->ccontext.NameLength = cpu_to_le16(4);
1543
	/* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
1544 1545 1546 1547 1548 1549 1550
	buf->Name[0] = 'D';
	buf->Name[1] = 'H';
	buf->Name[2] = 'n';
	buf->Name[3] = 'Q';
	return buf;
}

1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567
static struct create_durable *
create_reconnect_durable_buf(struct cifs_fid *fid)
{
	struct create_durable *buf;

	buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
	if (!buf)
		return NULL;

	buf->ccontext.DataOffset = cpu_to_le16(offsetof
					(struct create_durable, Data));
	buf->ccontext.DataLength = cpu_to_le32(16);
	buf->ccontext.NameOffset = cpu_to_le16(offsetof
				(struct create_durable, Name));
	buf->ccontext.NameLength = cpu_to_le16(4);
	buf->Data.Fid.PersistentFileId = fid->persistent_fid;
	buf->Data.Fid.VolatileFileId = fid->volatile_fid;
1568
	/* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
1569 1570 1571 1572 1573 1574 1575
	buf->Name[0] = 'D';
	buf->Name[1] = 'H';
	buf->Name[2] = 'n';
	buf->Name[3] = 'C';
	return buf;
}

P
Pavel Shilovsky 已提交
1576
static __u8
1577
parse_lease_state(struct TCP_Server_Info *server, struct smb2_create_rsp *rsp,
1578
		  unsigned int *epoch, char *lease_key)
P
Pavel Shilovsky 已提交
1579 1580
{
	char *data_offset;
1581
	struct create_context *cc;
1582 1583
	unsigned int next;
	unsigned int remaining;
1584
	char *name;
P
Pavel Shilovsky 已提交
1585

1586
	data_offset = (char *)rsp + server->vals->header_preamble_size + le32_to_cpu(rsp->CreateContextsOffset);
1587
	remaining = le32_to_cpu(rsp->CreateContextsLength);
1588
	cc = (struct create_context *)data_offset;
1589
	while (remaining >= sizeof(struct create_context)) {
1590
		name = le16_to_cpu(cc->NameOffset) + (char *)cc;
1591 1592
		if (le16_to_cpu(cc->NameLength) == 4 &&
		    strncmp(name, "RqLs", 4) == 0)
1593 1594
			return server->ops->parse_lease_buf(cc, epoch,
							    lease_key);
1595 1596 1597 1598 1599 1600 1601

		next = le32_to_cpu(cc->Next);
		if (!next)
			break;
		remaining -= next;
		cc = (struct create_context *)((char *)cc + next);
	}
P
Pavel Shilovsky 已提交
1602

1603
	return 0;
P
Pavel Shilovsky 已提交
1604 1605
}

1606
static int
1607 1608
add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
		  unsigned int *num_iovec, __u8 *oplock)
1609 1610 1611 1612
{
	struct smb2_create_req *req = iov[0].iov_base;
	unsigned int num = *num_iovec;

1613
	iov[num].iov_base = server->ops->create_lease_buf(oplock+1, *oplock);
1614 1615
	if (iov[num].iov_base == NULL)
		return -ENOMEM;
1616
	iov[num].iov_len = server->vals->create_lease_size;
1617 1618 1619
	req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
	if (!req->CreateContextsOffset)
		req->CreateContextsOffset = cpu_to_le32(
1620
				sizeof(struct smb2_create_req) +
1621
				iov[num - 1].iov_len);
1622 1623
	le32_add_cpu(&req->CreateContextsLength,
		     server->vals->create_lease_size);
1624 1625 1626 1627
	*num_iovec = num + 1;
	return 0;
}

1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645
static struct create_durable_v2 *
create_durable_v2_buf(struct cifs_fid *pfid)
{
	struct create_durable_v2 *buf;

	buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
	if (!buf)
		return NULL;

	buf->ccontext.DataOffset = cpu_to_le16(offsetof
					(struct create_durable_v2, dcontext));
	buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
	buf->ccontext.NameOffset = cpu_to_le16(offsetof
				(struct create_durable_v2, Name));
	buf->ccontext.NameLength = cpu_to_le16(4);

	buf->dcontext.Timeout = 0; /* Should this be configurable by workload */
	buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1646
	generate_random_uuid(buf->dcontext.CreateGuid);
1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689
	memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);

	/* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
	buf->Name[0] = 'D';
	buf->Name[1] = 'H';
	buf->Name[2] = '2';
	buf->Name[3] = 'Q';
	return buf;
}

static struct create_durable_handle_reconnect_v2 *
create_reconnect_durable_v2_buf(struct cifs_fid *fid)
{
	struct create_durable_handle_reconnect_v2 *buf;

	buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
			GFP_KERNEL);
	if (!buf)
		return NULL;

	buf->ccontext.DataOffset =
		cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
				     dcontext));
	buf->ccontext.DataLength =
		cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
	buf->ccontext.NameOffset =
		cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
			    Name));
	buf->ccontext.NameLength = cpu_to_le16(4);

	buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
	buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
	buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
	memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);

	/* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
	buf->Name[0] = 'D';
	buf->Name[1] = 'H';
	buf->Name[2] = '2';
	buf->Name[3] = 'C';
	return buf;
}

1690
static int
1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702
add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
		    struct cifs_open_parms *oparms)
{
	struct smb2_create_req *req = iov[0].iov_base;
	unsigned int num = *num_iovec;

	iov[num].iov_base = create_durable_v2_buf(oparms->fid);
	if (iov[num].iov_base == NULL)
		return -ENOMEM;
	iov[num].iov_len = sizeof(struct create_durable_v2);
	if (!req->CreateContextsOffset)
		req->CreateContextsOffset =
1703
			cpu_to_le32(sizeof(struct smb2_create_req) +
1704 1705 1706 1707 1708 1709 1710 1711
								iov[1].iov_len);
	le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
	*num_iovec = num + 1;
	return 0;
}

static int
add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
1712
		    struct cifs_open_parms *oparms)
1713 1714 1715 1716
{
	struct smb2_create_req *req = iov[0].iov_base;
	unsigned int num = *num_iovec;

1717 1718 1719 1720 1721 1722 1723 1724 1725
	/* indicate that we don't need to relock the file */
	oparms->reconnect = false;

	iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
	if (iov[num].iov_base == NULL)
		return -ENOMEM;
	iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
	if (!req->CreateContextsOffset)
		req->CreateContextsOffset =
1726
			cpu_to_le32(sizeof(struct smb2_create_req) +
1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748
								iov[1].iov_len);
	le32_add_cpu(&req->CreateContextsLength,
			sizeof(struct create_durable_handle_reconnect_v2));
	*num_iovec = num + 1;
	return 0;
}

static int
add_durable_context(struct kvec *iov, unsigned int *num_iovec,
		    struct cifs_open_parms *oparms, bool use_persistent)
{
	struct smb2_create_req *req = iov[0].iov_base;
	unsigned int num = *num_iovec;

	if (use_persistent) {
		if (oparms->reconnect)
			return add_durable_reconnect_v2_context(iov, num_iovec,
								oparms);
		else
			return add_durable_v2_context(iov, num_iovec, oparms);
	}

1749 1750 1751 1752 1753 1754
	if (oparms->reconnect) {
		iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
		/* indicate that we don't need to relock the file */
		oparms->reconnect = false;
	} else
		iov[num].iov_base = create_durable_buf();
1755 1756 1757 1758 1759
	if (iov[num].iov_base == NULL)
		return -ENOMEM;
	iov[num].iov_len = sizeof(struct create_durable);
	if (!req->CreateContextsOffset)
		req->CreateContextsOffset =
1760
			cpu_to_le32(sizeof(struct smb2_create_req) +
1761
								iov[1].iov_len);
1762
	le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
1763 1764 1765 1766
	*num_iovec = num + 1;
	return 0;
}

1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811
static int
alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
			    const char *treename, const __le16 *path)
{
	int treename_len, path_len;
	struct nls_table *cp;
	const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};

	/*
	 * skip leading "\\"
	 */
	treename_len = strlen(treename);
	if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
		return -EINVAL;

	treename += 2;
	treename_len -= 2;

	path_len = UniStrnlen((wchar_t *)path, PATH_MAX);

	/*
	 * make room for one path separator between the treename and
	 * path
	 */
	*out_len = treename_len + 1 + path_len;

	/*
	 * final path needs to be null-terminated UTF16 with a
	 * size aligned to 8
	 */

	*out_size = roundup((*out_len+1)*2, 8);
	*out_path = kzalloc(*out_size, GFP_KERNEL);
	if (!*out_path)
		return -ENOMEM;

	cp = load_nls_default();
	cifs_strtoUTF16(*out_path, treename, treename_len, cp);
	UniStrcat(*out_path, sep);
	UniStrcat(*out_path, path);
	unload_nls(cp);

	return 0;
}

1812
int
1813
SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
1814
	  __u8 *oplock, struct smb2_file_all_info *buf,
1815
	  struct kvec *err_iov)
1816 1817 1818 1819
{
	struct smb2_create_req *req;
	struct smb2_create_rsp *rsp;
	struct TCP_Server_Info *server;
1820
	struct cifs_tcon *tcon = oparms->tcon;
1821
	struct cifs_ses *ses = tcon->ses;
1822
	struct kvec iov[4];
1823
	struct kvec rsp_iov = {NULL, 0};
1824 1825
	int resp_buftype;
	int uni_path_len;
P
Pavel Shilovsky 已提交
1826 1827
	__le16 *copy_path = NULL;
	int copy_size;
1828
	int rc = 0;
1829
	unsigned int n_iov = 2;
1830
	__u32 file_attributes = 0;
1831
	char *dhc_buf = NULL, *lc_buf = NULL;
1832
	int flags = 0;
1833
	unsigned int total_len;
1834

1835
	cifs_dbg(FYI, "create/open\n");
1836 1837 1838 1839 1840 1841

	if (ses && (ses->server))
		server = ses->server;
	else
		return -EIO;

1842 1843
	rc = smb2_plain_req_init(SMB2_CREATE, tcon, (void **) &req, &total_len);

1844 1845 1846
	if (rc)
		return rc;

1847 1848 1849
	if (encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

1850
	if (oparms->create_options & CREATE_OPTION_READONLY)
1851
		file_attributes |= ATTR_READONLY;
1852 1853
	if (oparms->create_options & CREATE_OPTION_SPECIAL)
		file_attributes |= ATTR_SYSTEM;
1854

1855
	req->ImpersonationLevel = IL_IMPERSONATION;
1856
	req->DesiredAccess = cpu_to_le32(oparms->desired_access);
1857 1858 1859
	/* File attributes ignored on open (used in create though) */
	req->FileAttributes = cpu_to_le32(file_attributes);
	req->ShareAccess = FILE_SHARE_ALL_LE;
1860 1861
	req->CreateDisposition = cpu_to_le32(oparms->disposition);
	req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
1862 1863

	iov[0].iov_base = (char *)req;
1864
	/* -1 since last byte is buf[0] which is sent below (path) */
1865
	iov[0].iov_len = total_len - 1;
1866

1867
	req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879

	/* [MS-SMB2] 2.2.13 NameOffset:
	 * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
	 * the SMB2 header, the file name includes a prefix that will
	 * be processed during DFS name normalization as specified in
	 * section 3.3.5.9. Otherwise, the file name is relative to
	 * the share that is identified by the TreeId in the SMB2
	 * header.
	 */
	if (tcon->share_flags & SHI1005_FLAGS_DFS) {
		int name_len;

1880
		req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
1881 1882 1883
		rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
						 &name_len,
						 tcon->treeName, path);
1884 1885
		if (rc) {
			cifs_small_buf_release(req);
1886
			return rc;
1887
		}
1888
		req->NameLength = cpu_to_le16(name_len * 2);
1889 1890
		uni_path_len = copy_size;
		path = copy_path;
1891 1892 1893 1894 1895 1896 1897
	} else {
		uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
		/* MUST set path len (NameLength) to 0 opening root of share */
		req->NameLength = cpu_to_le16(uni_path_len - 2);
		if (uni_path_len % 8 != 0) {
			copy_size = roundup(uni_path_len, 8);
			copy_path = kzalloc(copy_size, GFP_KERNEL);
1898 1899
			if (!copy_path) {
				cifs_small_buf_release(req);
1900
				return -ENOMEM;
1901
			}
1902 1903 1904 1905 1906
			memcpy((char *)copy_path, (const char *)path,
			       uni_path_len);
			uni_path_len = copy_size;
			path = copy_path;
		}
1907 1908
	}

1909 1910 1911
	iov[1].iov_len = uni_path_len;
	iov[1].iov_base = path;

P
Pavel Shilovsky 已提交
1912 1913 1914
	if (!server->oplocks)
		*oplock = SMB2_OPLOCK_LEVEL_NONE;

1915
	if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
P
Pavel Shilovsky 已提交
1916 1917 1918
	    *oplock == SMB2_OPLOCK_LEVEL_NONE)
		req->RequestedOplockLevel = *oplock;
	else {
1919
		rc = add_lease_context(server, iov, &n_iov, oplock);
1920
		if (rc) {
P
Pavel Shilovsky 已提交
1921 1922
			cifs_small_buf_release(req);
			kfree(copy_path);
1923
			return rc;
P
Pavel Shilovsky 已提交
1924
		}
1925
		lc_buf = iov[n_iov-1].iov_base;
P
Pavel Shilovsky 已提交
1926 1927
	}

1928 1929
	if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
		/* need to set Next field of lease context if we request it */
1930
		if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
1931
			struct create_context *ccontext =
1932
			    (struct create_context *)iov[n_iov-1].iov_base;
1933
			ccontext->Next =
1934
				cpu_to_le32(server->vals->create_lease_size);
1935
		}
1936

1937
		rc = add_durable_context(iov, &n_iov, oparms,
1938
					tcon->use_persistent);
1939 1940 1941
		if (rc) {
			cifs_small_buf_release(req);
			kfree(copy_path);
1942
			kfree(lc_buf);
1943 1944
			return rc;
		}
1945
		dhc_buf = iov[n_iov-1].iov_base;
1946 1947
	}

1948 1949
	rc = smb2_send_recv(xid, ses, iov, n_iov, &resp_buftype, flags,
			    &rsp_iov);
1950 1951
	cifs_small_buf_release(req);
	rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
1952 1953 1954

	if (rc != 0) {
		cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
1955 1956 1957 1958 1959
		if (err_iov && rsp) {
			*err_iov = rsp_iov;
			resp_buftype = CIFS_NO_BUFFER;
			rsp = NULL;
		}
1960 1961 1962
		goto creat_exit;
	}

1963 1964
	oparms->fid->persistent_fid = rsp->PersistentFileId;
	oparms->fid->volatile_fid = rsp->VolatileFileId;
1965 1966 1967 1968 1969 1970 1971 1972 1973

	if (buf) {
		memcpy(buf, &rsp->CreationTime, 32);
		buf->AllocationSize = rsp->AllocationSize;
		buf->EndOfFile = rsp->EndofFile;
		buf->Attributes = rsp->FileAttributes;
		buf->NumberOfLinks = cpu_to_le32(1);
		buf->DeletePending = 0;
	}
P
Pavel Shilovsky 已提交
1974

P
Pavel Shilovsky 已提交
1975
	if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
1976 1977
		*oplock = parse_lease_state(server, rsp, &oparms->fid->epoch,
					    oparms->fid->lease_key);
P
Pavel Shilovsky 已提交
1978 1979
	else
		*oplock = rsp->OplockLevel;
1980
creat_exit:
P
Pavel Shilovsky 已提交
1981
	kfree(copy_path);
1982 1983
	kfree(lc_buf);
	kfree(dhc_buf);
1984 1985 1986 1987
	free_rsp_buf(resp_buftype, rsp);
	return rc;
}

1988 1989 1990 1991 1992
/*
 *	SMB2 IOCTL is used for both IOCTLs and FSCTLs
 */
int
SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1993
	   u64 volatile_fid, u32 opcode, bool is_fsctl,
1994 1995
	   char *in_data, u32 indatalen,
	   char **out_data, u32 *plen /* returned data len */)
1996 1997 1998
{
	struct smb2_ioctl_req *req;
	struct smb2_ioctl_rsp *rsp;
1999
	struct smb2_sync_hdr *shdr;
2000
	struct cifs_ses *ses;
2001
	struct kvec iov[2];
2002
	struct kvec rsp_iov;
2003
	int resp_buftype;
2004
	int n_iov;
2005
	int rc = 0;
2006
	int flags = 0;
2007
	unsigned int total_len;
2008 2009 2010

	cifs_dbg(FYI, "SMB2 IOCTL\n");

2011 2012 2013
	if (out_data != NULL)
		*out_data = NULL;

2014 2015 2016 2017
	/* zero out returned data len, in case of error */
	if (plen)
		*plen = 0;

2018 2019 2020 2021 2022
	if (tcon)
		ses = tcon->ses;
	else
		return -EIO;

2023
	if (!ses || !(ses->server))
2024 2025
		return -EIO;

2026
	rc = smb2_plain_req_init(SMB2_IOCTL, tcon, (void **) &req, &total_len);
2027 2028 2029
	if (rc)
		return rc;

2030 2031 2032
	if (encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

2033 2034 2035 2036 2037 2038 2039 2040
	req->CtlCode = cpu_to_le32(opcode);
	req->PersistentFileId = persistent_fid;
	req->VolatileFileId = volatile_fid;

	if (indatalen) {
		req->InputCount = cpu_to_le32(indatalen);
		/* do not set InputOffset if no input data */
		req->InputOffset =
2041
		       cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer));
2042 2043
		iov[1].iov_base = in_data;
		iov[1].iov_len = indatalen;
2044
		n_iov = 2;
2045
	} else
2046
		n_iov = 1;
2047 2048 2049 2050 2051 2052 2053 2054 2055

	req->OutputOffset = 0;
	req->OutputCount = 0; /* MBZ */

	/*
	 * Could increase MaxOutputResponse, but that would require more
	 * than one credit. Windows typically sets this smaller, but for some
	 * ioctls it may be useful to allow server to send more. No point
	 * limiting what the server can send as long as fits in one credit
2056 2057 2058 2059
	 * Unfortunately - we can not handle more than CIFS_MAX_MSG_SIZE
	 * (by default, note that it can be overridden to make max larger)
	 * in responses (except for read responses which can be bigger.
	 * We may want to bump this limit up
2060
	 */
2061
	req->MaxOutputResponse = cpu_to_le32(CIFSMaxBufSize);
2062 2063 2064 2065 2066 2067 2068 2069

	if (is_fsctl)
		req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
	else
		req->Flags = 0;

	iov[0].iov_base = (char *)req;

S
Steve French 已提交
2070 2071 2072 2073 2074 2075
	/*
	 * If no input data, the size of ioctl struct in
	 * protocol spec still includes a 1 byte data buffer,
	 * but if input data passed to ioctl, we do not
	 * want to double count this, so we do not send
	 * the dummy one byte of data in iovec[0] if sending
2076
	 * input data (in iovec[1]).
S
Steve French 已提交
2077 2078 2079
	 */

	if (indatalen) {
2080
		iov[0].iov_len = total_len - 1;
S
Steve French 已提交
2081
	} else
2082
		iov[0].iov_len = total_len;
S
Steve French 已提交
2083

2084 2085
	/* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
	if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
2086
		req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
2087

2088 2089
	rc = smb2_send_recv(xid, ses, iov, n_iov, &resp_buftype, flags,
			    &rsp_iov);
2090 2091
	cifs_small_buf_release(req);
	rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
2092

2093
	if ((rc != 0) && (rc != -EINVAL)) {
2094
		cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2095
		goto ioctl_exit;
2096 2097 2098
	} else if (rc == -EINVAL) {
		if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
		    (opcode != FSCTL_SRV_COPYCHUNK)) {
2099
			cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2100 2101
			goto ioctl_exit;
		}
2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133
	}

	/* check if caller wants to look at return data or just return rc */
	if ((plen == NULL) || (out_data == NULL))
		goto ioctl_exit;

	*plen = le32_to_cpu(rsp->OutputCount);

	/* We check for obvious errors in the output buffer length and offset */
	if (*plen == 0)
		goto ioctl_exit; /* server returned no data */
	else if (*plen > 0xFF00) {
		cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
		*plen = 0;
		rc = -EIO;
		goto ioctl_exit;
	}

	if (get_rfc1002_length(rsp) < le32_to_cpu(rsp->OutputOffset) + *plen) {
		cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
			le32_to_cpu(rsp->OutputOffset));
		*plen = 0;
		rc = -EIO;
		goto ioctl_exit;
	}

	*out_data = kmalloc(*plen, GFP_KERNEL);
	if (*out_data == NULL) {
		rc = -ENOMEM;
		goto ioctl_exit;
	}

2134 2135
	shdr = get_sync_hdr(rsp);
	memcpy(*out_data, (char *)shdr + le32_to_cpu(rsp->OutputOffset), *plen);
2136 2137 2138 2139 2140
ioctl_exit:
	free_rsp_buf(resp_buftype, rsp);
	return rc;
}

2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153
/*
 *   Individual callers to ioctl worker function follow
 */

int
SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
		     u64 persistent_fid, u64 volatile_fid)
{
	int rc;
	struct  compress_ioctl fsctl_input;
	char *ret_data = NULL;

	fsctl_input.CompressionState =
2154
			cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165

	rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
			FSCTL_SET_COMPRESSION, true /* is_fsctl */,
			(char *)&fsctl_input /* data input */,
			2 /* in data len */, &ret_data /* out data */, NULL);

	cifs_dbg(FYI, "set compression rc %d\n", rc);

	return rc;
}

2166 2167 2168 2169 2170 2171 2172 2173
int
SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
	   u64 persistent_fid, u64 volatile_fid)
{
	struct smb2_close_req *req;
	struct smb2_close_rsp *rsp;
	struct cifs_ses *ses = tcon->ses;
	struct kvec iov[1];
2174
	struct kvec rsp_iov;
2175 2176
	int resp_buftype;
	int rc = 0;
2177
	int flags = 0;
2178
	unsigned int total_len;
2179

2180
	cifs_dbg(FYI, "Close\n");
2181

2182
	if (!ses || !(ses->server))
2183 2184
		return -EIO;

2185
	rc = smb2_plain_req_init(SMB2_CLOSE, tcon, (void **) &req, &total_len);
2186 2187 2188
	if (rc)
		return rc;

2189 2190 2191
	if (encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

2192 2193 2194 2195
	req->PersistentFileId = persistent_fid;
	req->VolatileFileId = volatile_fid;

	iov[0].iov_base = (char *)req;
2196
	iov[0].iov_len = total_len;
2197

2198
	rc = smb2_send_recv(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
2199 2200
	cifs_small_buf_release(req);
	rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
2201 2202

	if (rc != 0) {
2203
		cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
2204 2205 2206 2207 2208 2209 2210 2211 2212
		goto close_exit;
	}

	/* BB FIXME - decode close response, update inode for caching */

close_exit:
	free_rsp_buf(resp_buftype, rsp);
	return rc;
}
P
Pavel Shilovsky 已提交
2213 2214

static int
2215 2216 2217
validate_iov(struct TCP_Server_Info *server,
	     unsigned int offset, unsigned int buffer_length,
	     struct kvec *iov, unsigned int min_buf_size)
P
Pavel Shilovsky 已提交
2218
{
2219 2220 2221
	unsigned int smb_len = iov->iov_len;
	char *end_of_smb = smb_len + server->vals->header_preamble_size + (char *)iov->iov_base;
	char *begin_of_buf = server->vals->header_preamble_size + offset + (char *)iov->iov_base;
P
Pavel Shilovsky 已提交
2222 2223 2224 2225
	char *end_of_buf = begin_of_buf + buffer_length;


	if (buffer_length < min_buf_size) {
2226 2227
		cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
			 buffer_length, min_buf_size);
P
Pavel Shilovsky 已提交
2228 2229 2230 2231 2232
		return -EINVAL;
	}

	/* check if beyond RFC1001 maximum length */
	if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
2233 2234
		cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
			 buffer_length, smb_len);
P
Pavel Shilovsky 已提交
2235 2236 2237 2238
		return -EINVAL;
	}

	if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
2239
		cifs_dbg(VFS, "illegal server response, bad offset to data\n");
P
Pavel Shilovsky 已提交
2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250
		return -EINVAL;
	}

	return 0;
}

/*
 * If SMB buffer fields are valid, copy into temporary buffer to hold result.
 * Caller must free buffer.
 */
static int
2251 2252 2253
validate_and_copy_iov(struct TCP_Server_Info *server,
		      unsigned int offset, unsigned int buffer_length,
		      struct kvec *iov, unsigned int minbufsize,
P
Pavel Shilovsky 已提交
2254 2255
		      char *data)
{
2256
	char *begin_of_buf = server->vals->header_preamble_size + offset + (char *)(iov->iov_base);
P
Pavel Shilovsky 已提交
2257 2258 2259 2260 2261
	int rc;

	if (!data)
		return -EINVAL;

2262
	rc = validate_iov(server, offset, buffer_length, iov, minbufsize);
P
Pavel Shilovsky 已提交
2263 2264 2265 2266 2267 2268 2269 2270
	if (rc)
		return rc;

	memcpy(data, begin_of_buf, buffer_length);

	return 0;
}

2271 2272
static int
query_info(const unsigned int xid, struct cifs_tcon *tcon,
2273 2274 2275
	   u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,
	   u32 additional_info, size_t output_len, size_t min_len, void **data,
		u32 *dlen)
P
Pavel Shilovsky 已提交
2276 2277 2278 2279
{
	struct smb2_query_info_req *req;
	struct smb2_query_info_rsp *rsp = NULL;
	struct kvec iov[2];
2280
	struct kvec rsp_iov;
P
Pavel Shilovsky 已提交
2281 2282 2283
	int rc = 0;
	int resp_buftype;
	struct cifs_ses *ses = tcon->ses;
2284
	int flags = 0;
2285
	unsigned int total_len;
P
Pavel Shilovsky 已提交
2286

2287
	cifs_dbg(FYI, "Query Info\n");
P
Pavel Shilovsky 已提交
2288

2289
	if (!ses || !(ses->server))
P
Pavel Shilovsky 已提交
2290 2291
		return -EIO;

2292 2293
	rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req,
			     &total_len);
P
Pavel Shilovsky 已提交
2294 2295 2296
	if (rc)
		return rc;

2297 2298 2299
	if (encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

2300
	req->InfoType = info_type;
2301
	req->FileInfoClass = info_class;
P
Pavel Shilovsky 已提交
2302 2303
	req->PersistentFileId = persistent_fid;
	req->VolatileFileId = volatile_fid;
2304
	req->AdditionalInformation = cpu_to_le32(additional_info);
2305 2306 2307 2308 2309 2310

	/*
	 * We do not use the input buffer (do not send extra byte)
	 */
	req->InputBufferOffset = 0;

2311
	req->OutputBufferLength = cpu_to_le32(output_len);
P
Pavel Shilovsky 已提交
2312 2313

	iov[0].iov_base = (char *)req;
2314 2315
	/* 1 for Buffer */
	iov[0].iov_len = total_len - 1;
P
Pavel Shilovsky 已提交
2316

2317
	rc = smb2_send_recv(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
2318 2319
	cifs_small_buf_release(req);
	rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
2320

P
Pavel Shilovsky 已提交
2321 2322 2323 2324 2325
	if (rc) {
		cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
		goto qinf_exit;
	}

2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339
	if (dlen) {
		*dlen = le32_to_cpu(rsp->OutputBufferLength);
		if (!*data) {
			*data = kmalloc(*dlen, GFP_KERNEL);
			if (!*data) {
				cifs_dbg(VFS,
					"Error %d allocating memory for acl\n",
					rc);
				*dlen = 0;
				goto qinf_exit;
			}
		}
	}

2340 2341
	rc = validate_and_copy_iov(ses->server,
				   le16_to_cpu(rsp->OutputBufferOffset),
P
Pavel Shilovsky 已提交
2342
				   le32_to_cpu(rsp->OutputBufferLength),
2343
				   &rsp_iov, min_len, *data);
P
Pavel Shilovsky 已提交
2344 2345 2346 2347 2348

qinf_exit:
	free_rsp_buf(resp_buftype, rsp);
	return rc;
}
2349

2350
int SMB2_query_eas(const unsigned int xid, struct cifs_tcon *tcon,
2351 2352
		   u64 persistent_fid, u64 volatile_fid,
		   int ea_buf_size, struct smb2_file_full_ea_info *data)
2353 2354 2355
{
	return query_info(xid, tcon, persistent_fid, volatile_fid,
			  FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE, 0,
2356
			  ea_buf_size,
2357 2358 2359 2360 2361
			  sizeof(struct smb2_file_full_ea_info),
			  (void **)&data,
			  NULL);
}

2362 2363 2364 2365 2366 2367 2368 2369 2370 2371
int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
	u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
{
	return query_info(xid, tcon, persistent_fid, volatile_fid,
			  FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,
			  sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
			  sizeof(struct smb2_file_all_info), (void **)&data,
			  NULL);
}

2372
int
2373
SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
2374
		u64 persistent_fid, u64 volatile_fid,
2375
		void **data, u32 *plen)
2376
{
2377 2378 2379
	__u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO;
	*plen = 0;

2380
	return query_info(xid, tcon, persistent_fid, volatile_fid,
2381 2382 2383
			  0, SMB2_O_INFO_SECURITY, additional_info,
			  SMB2_MAX_BUFFER_SIZE,
			  sizeof(struct smb2_file_all_info), data, plen);
2384 2385 2386 2387 2388 2389 2390
}

int
SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
		 u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
{
	return query_info(xid, tcon, persistent_fid, volatile_fid,
2391 2392
			  FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
			  sizeof(struct smb2_file_internal_info),
2393
			  sizeof(struct smb2_file_internal_info),
2394
			  (void **)&uniqueid, NULL);
2395 2396
}

2397 2398 2399 2400 2401 2402 2403 2404 2405 2406 2407
/*
 * This is a no-op for now. We're not really interested in the reply, but
 * rather in the fact that the server sent one and that server->lstrp
 * gets updated.
 *
 * FIXME: maybe we should consider checking that the reply matches request?
 */
static void
smb2_echo_callback(struct mid_q_entry *mid)
{
	struct TCP_Server_Info *server = mid->callback_data;
2408
	struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
2409 2410 2411
	unsigned int credits_received = 1;

	if (mid->mid_state == MID_RESPONSE_RECEIVED)
2412
		credits_received = le16_to_cpu(rsp->hdr.sync_hdr.CreditRequest);
2413 2414 2415 2416 2417

	DeleteMidQEntry(mid);
	add_credits(server, credits_received, CIFS_ECHO_OP);
}

2418 2419 2420 2421 2422 2423 2424 2425
void smb2_reconnect_server(struct work_struct *work)
{
	struct TCP_Server_Info *server = container_of(work,
					struct TCP_Server_Info, reconnect.work);
	struct cifs_ses *ses;
	struct cifs_tcon *tcon, *tcon2;
	struct list_head tmp_list;
	int tcon_exist = false;
2426 2427 2428
	int rc;
	int resched = false;

2429 2430 2431 2432 2433 2434 2435 2436 2437 2438

	/* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
	mutex_lock(&server->reconnect_mutex);

	INIT_LIST_HEAD(&tmp_list);
	cifs_dbg(FYI, "Need negotiate, reconnecting tcons\n");

	spin_lock(&cifs_tcp_ses_lock);
	list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
		list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
2439
			if (tcon->need_reconnect || tcon->need_reopen_files) {
2440 2441 2442 2443 2444
				tcon->tc_count++;
				list_add_tail(&tcon->rlist, &tmp_list);
				tcon_exist = true;
			}
		}
A
Aurelien Aptel 已提交
2445 2446 2447 2448
		if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) {
			list_add_tail(&ses->tcon_ipc->rlist, &tmp_list);
			tcon_exist = true;
		}
2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459
	}
	/*
	 * Get the reference to server struct to be sure that the last call of
	 * cifs_put_tcon() in the loop below won't release the server pointer.
	 */
	if (tcon_exist)
		server->srv_count++;

	spin_unlock(&cifs_tcp_ses_lock);

	list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
2460 2461
		rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon);
		if (!rc)
2462
			cifs_reopen_persistent_handles(tcon);
2463 2464
		else
			resched = true;
2465 2466 2467 2468 2469
		list_del_init(&tcon->rlist);
		cifs_put_tcon(tcon);
	}

	cifs_dbg(FYI, "Reconnecting tcons finished\n");
2470 2471
	if (resched)
		queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
2472 2473 2474 2475 2476 2477 2478
	mutex_unlock(&server->reconnect_mutex);

	/* now we can safely release srv struct */
	if (tcon_exist)
		cifs_put_tcp_session(server, 1);
}

2479 2480 2481 2482 2483
int
SMB2_echo(struct TCP_Server_Info *server)
{
	struct smb2_echo_req *req;
	int rc = 0;
2484 2485 2486
	struct kvec iov[2];
	struct smb_rqst rqst = { .rq_iov = iov,
				 .rq_nvec = 2 };
2487 2488
	unsigned int total_len;
	__be32 rfc1002_marker;
2489

2490
	cifs_dbg(FYI, "In echo request\n");
2491

2492
	if (server->tcpStatus == CifsNeedNegotiate) {
2493 2494 2495
		/* No need to send echo on newly established connections */
		queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
		return rc;
2496 2497
	}

2498
	rc = smb2_plain_req_init(SMB2_ECHO, NULL, (void **)&req, &total_len);
2499 2500 2501
	if (rc)
		return rc;

2502
	req->sync_hdr.CreditRequest = cpu_to_le16(1);
2503

2504
	iov[0].iov_len = 4;
2505 2506 2507 2508
	rfc1002_marker = cpu_to_be32(total_len);
	iov[0].iov_base = &rfc1002_marker;
	iov[1].iov_len = total_len;
	iov[1].iov_base = (char *)req;
2509

P
Pavel Shilovsky 已提交
2510 2511
	rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
			     server, CIFS_ECHO_OP);
2512
	if (rc)
2513
		cifs_dbg(FYI, "Echo request failed: %d\n", rc);
2514 2515 2516 2517

	cifs_small_buf_release(req);
	return rc;
}
2518 2519 2520 2521 2522 2523 2524 2525

int
SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
	   u64 volatile_fid)
{
	struct smb2_flush_req *req;
	struct cifs_ses *ses = tcon->ses;
	struct kvec iov[1];
2526
	struct kvec rsp_iov;
2527 2528
	int resp_buftype;
	int rc = 0;
2529
	int flags = 0;
2530
	unsigned int total_len;
2531

2532
	cifs_dbg(FYI, "Flush\n");
2533

2534
	if (!ses || !(ses->server))
2535 2536
		return -EIO;

2537
	rc = smb2_plain_req_init(SMB2_FLUSH, tcon, (void **) &req, &total_len);
2538 2539 2540
	if (rc)
		return rc;

2541 2542 2543
	if (encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

2544 2545 2546 2547
	req->PersistentFileId = persistent_fid;
	req->VolatileFileId = volatile_fid;

	iov[0].iov_base = (char *)req;
2548
	iov[0].iov_len = total_len;
2549

2550
	rc = smb2_send_recv(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
2551
	cifs_small_buf_release(req);
2552

2553
	if (rc != 0)
2554 2555
		cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);

2556
	free_rsp_buf(resp_buftype, rsp_iov.iov_base);
2557 2558
	return rc;
}
2559 2560 2561 2562 2563 2564

/*
 * To form a chain of read requests, any read requests after the first should
 * have the end_of_chain boolean set to true.
 */
static int
2565
smb2_new_read_req(void **buf, unsigned int *total_len,
2566 2567
	struct cifs_io_parms *io_parms, struct cifs_readdata *rdata,
	unsigned int remaining_bytes, int request_type)
2568 2569
{
	int rc = -EACCES;
2570
	struct smb2_read_plain_req *req = NULL;
2571
	struct smb2_sync_hdr *shdr;
2572
	struct TCP_Server_Info *server;
2573

2574 2575
	rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, (void **) &req,
				 total_len);
2576 2577
	if (rc)
		return rc;
2578 2579 2580

	server = io_parms->tcon->ses->server;
	if (server == NULL)
2581 2582
		return -ECONNABORTED;

2583
	shdr = &req->sync_hdr;
2584
	shdr->ProcessId = cpu_to_le32(io_parms->pid);
2585 2586 2587 2588 2589 2590 2591 2592 2593

	req->PersistentFileId = io_parms->persistent_fid;
	req->VolatileFileId = io_parms->volatile_fid;
	req->ReadChannelInfoOffset = 0; /* reserved */
	req->ReadChannelInfoLength = 0; /* reserved */
	req->Channel = 0; /* reserved */
	req->MinimumCount = 0;
	req->Length = cpu_to_le32(io_parms->length);
	req->Offset = cpu_to_le64(io_parms->offset);
2594 2595 2596 2597 2598
#ifdef CONFIG_CIFS_SMB_DIRECT
	/*
	 * If we want to do a RDMA write, fill in and append
	 * smbd_buffer_descriptor_v1 to the end of read request
	 */
2599
	if (server->rdma && rdata && !server->sign &&
2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616
		rdata->bytes >= server->smbd_conn->rdma_readwrite_threshold) {

		struct smbd_buffer_descriptor_v1 *v1;
		bool need_invalidate =
			io_parms->tcon->ses->server->dialect == SMB30_PROT_ID;

		rdata->mr = smbd_register_mr(
				server->smbd_conn, rdata->pages,
				rdata->nr_pages, rdata->tailsz,
				true, need_invalidate);
		if (!rdata->mr)
			return -ENOBUFS;

		req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
		if (need_invalidate)
			req->Channel = SMB2_CHANNEL_RDMA_V1;
		req->ReadChannelInfoOffset =
2617
			cpu_to_le16(offsetof(struct smb2_read_plain_req, Buffer));
2618
		req->ReadChannelInfoLength =
2619
			cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
2620
		v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
2621 2622 2623
		v1->offset = cpu_to_le64(rdata->mr->mr->iova);
		v1->token = cpu_to_le32(rdata->mr->mr->rkey);
		v1->length = cpu_to_le32(rdata->mr->mr->length);
2624 2625 2626 2627

		*total_len += sizeof(*v1) - 1;
	}
#endif
2628 2629
	if (request_type & CHAINED_REQUEST) {
		if (!(request_type & END_OF_CHAIN)) {
2630 2631 2632
			/* next 8-byte aligned request */
			*total_len = DIV_ROUND_UP(*total_len, 8) * 8;
			shdr->NextCommand = cpu_to_le32(*total_len);
2633
		} else /* END_OF_CHAIN */
2634
			shdr->NextCommand = 0;
2635
		if (request_type & RELATED_REQUEST) {
2636
			shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
2637 2638 2639 2640
			/*
			 * Related requests use info from previous read request
			 * in chain.
			 */
2641 2642
			shdr->SessionId = 0xFFFFFFFF;
			shdr->TreeId = 0xFFFFFFFF;
2643 2644 2645 2646 2647 2648 2649 2650 2651
			req->PersistentFileId = 0xFFFFFFFF;
			req->VolatileFileId = 0xFFFFFFFF;
		}
	}
	if (remaining_bytes > io_parms->length)
		req->RemainingBytes = cpu_to_le32(remaining_bytes);
	else
		req->RemainingBytes = 0;

2652
	*buf = req;
2653 2654 2655 2656 2657 2658 2659 2660 2661
	return rc;
}

static void
smb2_readv_callback(struct mid_q_entry *mid)
{
	struct cifs_readdata *rdata = mid->callback_data;
	struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
	struct TCP_Server_Info *server = tcon->ses->server;
2662 2663
	struct smb2_sync_hdr *shdr =
				(struct smb2_sync_hdr *)rdata->iov[1].iov_base;
2664
	unsigned int credits_received = 1;
2665 2666
	struct smb_rqst rqst = { .rq_iov = rdata->iov,
				 .rq_nvec = 2,
2667 2668 2669 2670
				 .rq_pages = rdata->pages,
				 .rq_npages = rdata->nr_pages,
				 .rq_pagesz = rdata->pagesz,
				 .rq_tailsz = rdata->tailsz };
2671

2672 2673 2674
	cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
		 __func__, mid->mid, mid->mid_state, rdata->result,
		 rdata->bytes);
2675 2676 2677

	switch (mid->mid_state) {
	case MID_RESPONSE_RECEIVED:
2678
		credits_received = le16_to_cpu(shdr->CreditRequest);
2679
		/* result already set, check signature */
2680
		if (server->sign && !mid->decrypted) {
P
Pavel Shilovsky 已提交
2681 2682
			int rc;

2683
			rc = smb2_verify_signature(&rqst, server);
P
Pavel Shilovsky 已提交
2684
			if (rc)
2685 2686
				cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
					 rc);
P
Pavel Shilovsky 已提交
2687
		}
2688
		/* FIXME: should this be counted toward the initiating task? */
2689 2690
		task_io_account_read(rdata->got_bytes);
		cifs_stats_bytes_read(tcon, rdata->got_bytes);
2691 2692 2693 2694
		break;
	case MID_REQUEST_SUBMITTED:
	case MID_RETRY_NEEDED:
		rdata->result = -EAGAIN;
2695 2696 2697 2698 2699 2700
		if (server->sign && rdata->got_bytes)
			/* reset bytes number since we can not check a sign */
			rdata->got_bytes = 0;
		/* FIXME: should this be counted toward the initiating task? */
		task_io_account_read(rdata->got_bytes);
		cifs_stats_bytes_read(tcon, rdata->got_bytes);
2701 2702 2703 2704 2705
		break;
	default:
		if (rdata->result != -ENODATA)
			rdata->result = -EIO;
	}
2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716
#ifdef CONFIG_CIFS_SMB_DIRECT
	/*
	 * If this rdata has a memmory registered, the MR can be freed
	 * MR needs to be freed as soon as I/O finishes to prevent deadlock
	 * because they have limited number and are used for future I/Os
	 */
	if (rdata->mr) {
		smbd_deregister_mr(rdata->mr);
		rdata->mr = NULL;
	}
#endif
2717 2718 2719 2720 2721 2722 2723 2724
	if (rdata->result)
		cifs_stats_fail_inc(tcon, SMB2_READ_HE);

	queue_work(cifsiod_wq, &rdata->work);
	DeleteMidQEntry(mid);
	add_credits(server, credits_received, 0);
}

2725
/* smb2_async_readv - send an async read, and set up mid to handle result */
2726 2727 2728
int
smb2_async_readv(struct cifs_readdata *rdata)
{
2729
	int rc, flags = 0;
2730 2731
	char *buf;
	struct smb2_sync_hdr *shdr;
2732
	struct cifs_io_parms io_parms;
2733 2734
	struct smb_rqst rqst = { .rq_iov = rdata->iov,
				 .rq_nvec = 2 };
2735
	struct TCP_Server_Info *server;
2736
	unsigned int total_len;
2737
	__be32 req_len;
2738

2739 2740
	cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
		 __func__, rdata->offset, rdata->bytes);
2741 2742 2743 2744 2745 2746 2747

	io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
	io_parms.offset = rdata->offset;
	io_parms.length = rdata->bytes;
	io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
	io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
	io_parms.pid = rdata->pid;
2748 2749 2750

	server = io_parms.tcon->ses->server;

2751 2752
	rc = smb2_new_read_req(
		(void **) &buf, &total_len, &io_parms, rdata, 0, 0);
2753 2754 2755 2756 2757 2758 2759 2760 2761
	if (rc) {
		if (rc == -EAGAIN && rdata->credits) {
			/* credits was reset by reconnect */
			rdata->credits = 0;
			/* reduce in_flight value since we won't send the req */
			spin_lock(&server->req_lock);
			server->in_flight--;
			spin_unlock(&server->req_lock);
		}
2762
		return rc;
2763
	}
2764

2765 2766 2767
	if (encryption_required(io_parms.tcon))
		flags |= CIFS_TRANSFORM_REQ;

2768 2769 2770 2771 2772 2773 2774 2775
	req_len = cpu_to_be32(total_len);

	rdata->iov[0].iov_base = &req_len;
	rdata->iov[0].iov_len = sizeof(__be32);
	rdata->iov[1].iov_base = buf;
	rdata->iov[1].iov_len = total_len;

	shdr = (struct smb2_sync_hdr *)buf;
2776

2777
	if (rdata->credits) {
2778
		shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
2779
						SMB2_MAX_BUFFER_SIZE));
2780
		shdr->CreditRequest = shdr->CreditCharge;
2781 2782
		spin_lock(&server->req_lock);
		server->credits += rdata->credits -
2783
						le16_to_cpu(shdr->CreditCharge);
2784 2785
		spin_unlock(&server->req_lock);
		wake_up(&server->request_q);
2786
		flags |= CIFS_HAS_CREDITS;
2787 2788
	}

2789
	kref_get(&rdata->refcount);
2790
	rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
2791
			     cifs_readv_receive, smb2_readv_callback,
2792
			     smb3_handle_read_data, rdata, flags);
2793
	if (rc) {
2794
		kref_put(&rdata->refcount, cifs_readdata_release);
2795 2796
		cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
	}
2797 2798 2799 2800

	cifs_small_buf_release(buf);
	return rc;
}
2801

2802 2803 2804 2805 2806
int
SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
	  unsigned int *nbytes, char **buf, int *buf_type)
{
	int resp_buftype, rc = -EACCES;
2807
	struct smb2_read_plain_req *req = NULL;
2808
	struct smb2_read_rsp *rsp = NULL;
2809
	struct smb2_sync_hdr *shdr;
2810
	struct kvec iov[1];
2811
	struct kvec rsp_iov;
2812
	unsigned int total_len;
2813 2814
	int flags = CIFS_LOG_ERROR;
	struct cifs_ses *ses = io_parms->tcon->ses;
2815 2816

	*nbytes = 0;
2817
	rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0);
2818 2819 2820
	if (rc)
		return rc;

2821 2822 2823
	if (encryption_required(io_parms->tcon))
		flags |= CIFS_TRANSFORM_REQ;

2824 2825
	iov[0].iov_base = (char *)req;
	iov[0].iov_len = total_len;
2826

2827
	rc = smb2_send_recv(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
2828
	cifs_small_buf_release(req);
2829

2830
	rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
2831

2832 2833 2834 2835 2836
	if (rc) {
		if (rc != -ENODATA) {
			cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
			cifs_dbg(VFS, "Send error in read = %d\n", rc);
		}
2837
		free_rsp_buf(resp_buftype, rsp_iov.iov_base);
2838
		return rc == -ENODATA ? 0 : rc;
2839 2840
	}

2841 2842 2843 2844 2845 2846 2847
	*nbytes = le32_to_cpu(rsp->DataLength);
	if ((*nbytes > CIFS_MAX_MSGSIZE) ||
	    (*nbytes > io_parms->length)) {
		cifs_dbg(FYI, "bad length %d for count %d\n",
			 *nbytes, io_parms->length);
		rc = -EIO;
		*nbytes = 0;
2848 2849
	}

2850 2851
	shdr = get_sync_hdr(rsp);

2852
	if (*buf) {
2853
		memcpy(*buf, (char *)shdr + rsp->DataOffset, *nbytes);
2854
		free_rsp_buf(resp_buftype, rsp_iov.iov_base);
2855
	} else if (resp_buftype != CIFS_NO_BUFFER) {
2856
		*buf = rsp_iov.iov_base;
2857 2858 2859 2860 2861 2862 2863 2864
		if (resp_buftype == CIFS_SMALL_BUFFER)
			*buf_type = CIFS_SMALL_BUFFER;
		else if (resp_buftype == CIFS_LARGE_BUFFER)
			*buf_type = CIFS_LARGE_BUFFER;
	}
	return rc;
}

2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879
/*
 * Check the mid_state and signature on received buffer (if any), and queue the
 * workqueue completion task.
 */
static void
smb2_writev_callback(struct mid_q_entry *mid)
{
	struct cifs_writedata *wdata = mid->callback_data;
	struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
	unsigned int written;
	struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
	unsigned int credits_received = 1;

	switch (mid->mid_state) {
	case MID_RESPONSE_RECEIVED:
2880
		credits_received = le16_to_cpu(rsp->hdr.sync_hdr.CreditRequest);
2881 2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893 2894 2895 2896 2897 2898 2899 2900 2901 2902 2903 2904 2905 2906 2907
		wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
		if (wdata->result != 0)
			break;

		written = le32_to_cpu(rsp->DataLength);
		/*
		 * Mask off high 16 bits when bytes written as returned
		 * by the server is greater than bytes requested by the
		 * client. OS/2 servers are known to set incorrect
		 * CountHigh values.
		 */
		if (written > wdata->bytes)
			written &= 0xFFFF;

		if (written < wdata->bytes)
			wdata->result = -ENOSPC;
		else
			wdata->bytes = written;
		break;
	case MID_REQUEST_SUBMITTED:
	case MID_RETRY_NEEDED:
		wdata->result = -EAGAIN;
		break;
	default:
		wdata->result = -EIO;
		break;
	}
2908 2909 2910 2911 2912 2913 2914 2915 2916 2917 2918 2919 2920
#ifdef CONFIG_CIFS_SMB_DIRECT
	/*
	 * If this wdata has a memory registered, the MR can be freed
	 * The number of MRs available is limited, it's important to recover
	 * used MR as soon as I/O is finished. Hold MR longer in the later
	 * I/O process can possibly result in I/O deadlock due to lack of MR
	 * to send request on I/O retry
	 */
	if (wdata->mr) {
		smbd_deregister_mr(wdata->mr);
		wdata->mr = NULL;
	}
#endif
2921 2922 2923 2924 2925 2926 2927 2928 2929 2930
	if (wdata->result)
		cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);

	queue_work(cifsiod_wq, &wdata->work);
	DeleteMidQEntry(mid);
	add_credits(tcon->ses->server, credits_received, 0);
}

/* smb2_async_writev - send an async write, and set up mid to handle result */
int
2931 2932
smb2_async_writev(struct cifs_writedata *wdata,
		  void (*release)(struct kref *kref))
2933
{
2934
	int rc = -EACCES, flags = 0;
2935
	struct smb2_write_req *req = NULL;
2936
	struct smb2_sync_hdr *shdr;
2937
	struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
2938
	struct TCP_Server_Info *server = tcon->ses->server;
2939 2940
	struct kvec iov[2];
	struct smb_rqst rqst = { };
2941 2942
	unsigned int total_len;
	__be32 rfc1002_marker;
2943

2944
	rc = smb2_plain_req_init(SMB2_WRITE, tcon, (void **) &req, &total_len);
2945 2946 2947 2948 2949 2950 2951 2952 2953
	if (rc) {
		if (rc == -EAGAIN && wdata->credits) {
			/* credits was reset by reconnect */
			wdata->credits = 0;
			/* reduce in_flight value since we won't send the req */
			spin_lock(&server->req_lock);
			server->in_flight--;
			spin_unlock(&server->req_lock);
		}
2954
		goto async_writev_out;
2955
	}
2956

2957 2958 2959
	if (encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

2960
	shdr = (struct smb2_sync_hdr *)req;
2961
	shdr->ProcessId = cpu_to_le32(wdata->cfile->pid);
2962 2963 2964 2965 2966 2967 2968 2969

	req->PersistentFileId = wdata->cfile->fid.persistent_fid;
	req->VolatileFileId = wdata->cfile->fid.volatile_fid;
	req->WriteChannelInfoOffset = 0;
	req->WriteChannelInfoLength = 0;
	req->Channel = 0;
	req->Offset = cpu_to_le64(wdata->offset);
	req->DataOffset = cpu_to_le16(
2970
				offsetof(struct smb2_write_req, Buffer));
2971
	req->RemainingBytes = 0;
2972 2973 2974 2975 2976
#ifdef CONFIG_CIFS_SMB_DIRECT
	/*
	 * If we want to do a server RDMA read, fill in and append
	 * smbd_buffer_descriptor_v1 to the end of write request
	 */
2977
	if (server->rdma && !server->sign && wdata->bytes >=
2978 2979 2980 2981 2982 2983 2984 2985 2986 2987 2988 2989 2990 2991 2992 2993
		server->smbd_conn->rdma_readwrite_threshold) {

		struct smbd_buffer_descriptor_v1 *v1;
		bool need_invalidate = server->dialect == SMB30_PROT_ID;

		wdata->mr = smbd_register_mr(
				server->smbd_conn, wdata->pages,
				wdata->nr_pages, wdata->tailsz,
				false, need_invalidate);
		if (!wdata->mr) {
			rc = -ENOBUFS;
			goto async_writev_out;
		}
		req->Length = 0;
		req->DataOffset = 0;
		req->RemainingBytes =
2994
			cpu_to_le32((wdata->nr_pages-1)*PAGE_SIZE + wdata->tailsz);
2995 2996 2997 2998
		req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
		if (need_invalidate)
			req->Channel = SMB2_CHANNEL_RDMA_V1;
		req->WriteChannelInfoOffset =
2999
			cpu_to_le16(offsetof(struct smb2_write_req, Buffer));
3000
		req->WriteChannelInfoLength =
3001
			cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
3002
		v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
3003 3004 3005
		v1->offset = cpu_to_le64(wdata->mr->mr->iova);
		v1->token = cpu_to_le32(wdata->mr->mr->rkey);
		v1->length = cpu_to_le32(wdata->mr->mr->length);
3006 3007
	}
#endif
3008
	/* 4 for rfc1002 length field and 1 for Buffer */
3009
	iov[0].iov_len = 4;
3010 3011 3012 3013
	rfc1002_marker = cpu_to_be32(total_len - 1 + wdata->bytes);
	iov[0].iov_base = &rfc1002_marker;
	iov[1].iov_len = total_len - 1;
	iov[1].iov_base = (char *)req;
3014

3015 3016
	rqst.rq_iov = iov;
	rqst.rq_nvec = 2;
3017 3018 3019 3020
	rqst.rq_pages = wdata->pages;
	rqst.rq_npages = wdata->nr_pages;
	rqst.rq_pagesz = wdata->pagesz;
	rqst.rq_tailsz = wdata->tailsz;
3021 3022 3023 3024 3025 3026
#ifdef CONFIG_CIFS_SMB_DIRECT
	if (wdata->mr) {
		iov[1].iov_len += sizeof(struct smbd_buffer_descriptor_v1);
		rqst.rq_npages = 0;
	}
#endif
3027 3028
	cifs_dbg(FYI, "async write at %llu %u bytes\n",
		 wdata->offset, wdata->bytes);
3029

3030 3031 3032 3033 3034
#ifdef CONFIG_CIFS_SMB_DIRECT
	/* For RDMA read, I/O size is in RemainingBytes not in Length */
	if (!wdata->mr)
		req->Length = cpu_to_le32(wdata->bytes);
#else
3035
	req->Length = cpu_to_le32(wdata->bytes);
3036
#endif
3037

3038
	if (wdata->credits) {
3039
		shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
3040
						    SMB2_MAX_BUFFER_SIZE));
3041
		shdr->CreditRequest = shdr->CreditCharge;
3042 3043
		spin_lock(&server->req_lock);
		server->credits += wdata->credits -
3044
						le16_to_cpu(shdr->CreditCharge);
3045 3046
		spin_unlock(&server->req_lock);
		wake_up(&server->request_q);
3047
		flags |= CIFS_HAS_CREDITS;
3048 3049
	}

3050
	kref_get(&wdata->refcount);
P
Pavel Shilovsky 已提交
3051 3052
	rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
			     wdata, flags);
3053

3054
	if (rc) {
3055
		kref_put(&wdata->refcount, release);
3056 3057
		cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
	}
3058 3059 3060 3061 3062

async_writev_out:
	cifs_small_buf_release(req);
	return rc;
}
3063 3064 3065 3066 3067 3068 3069 3070 3071 3072 3073 3074 3075 3076 3077

/*
 * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
 * The length field from io_parms must be at least 1 and indicates a number of
 * elements with data to write that begins with position 1 in iov array. All
 * data length is specified by count.
 */
int
SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
	   unsigned int *nbytes, struct kvec *iov, int n_vec)
{
	int rc = 0;
	struct smb2_write_req *req = NULL;
	struct smb2_write_rsp *rsp = NULL;
	int resp_buftype;
3078
	struct kvec rsp_iov;
3079
	int flags = 0;
3080
	unsigned int total_len;
3081

3082 3083 3084 3085 3086
	*nbytes = 0;

	if (n_vec < 1)
		return rc;

3087 3088
	rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, (void **) &req,
			     &total_len);
3089 3090 3091 3092 3093 3094
	if (rc)
		return rc;

	if (io_parms->tcon->ses->server == NULL)
		return -ECONNABORTED;

3095 3096 3097
	if (encryption_required(io_parms->tcon))
		flags |= CIFS_TRANSFORM_REQ;

3098
	req->sync_hdr.ProcessId = cpu_to_le32(io_parms->pid);
3099 3100 3101 3102 3103 3104 3105 3106 3107

	req->PersistentFileId = io_parms->persistent_fid;
	req->VolatileFileId = io_parms->volatile_fid;
	req->WriteChannelInfoOffset = 0;
	req->WriteChannelInfoLength = 0;
	req->Channel = 0;
	req->Length = cpu_to_le32(io_parms->length);
	req->Offset = cpu_to_le64(io_parms->offset);
	req->DataOffset = cpu_to_le16(
3108
				offsetof(struct smb2_write_req, Buffer));
3109 3110 3111
	req->RemainingBytes = 0;

	iov[0].iov_base = (char *)req;
3112 3113
	/* 1 for Buffer */
	iov[0].iov_len = total_len - 1;
3114

3115 3116
	rc = smb2_send_recv(xid, io_parms->tcon->ses, iov, n_vec + 1,
			    &resp_buftype, flags, &rsp_iov);
3117 3118
	cifs_small_buf_release(req);
	rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
3119 3120 3121

	if (rc) {
		cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
3122
		cifs_dbg(VFS, "Send error in write = %d\n", rc);
3123
	} else
3124
		*nbytes = le32_to_cpu(rsp->DataLength);
3125 3126

	free_rsp_buf(resp_buftype, rsp);
3127 3128
	return rc;
}
3129

3130 3131 3132 3133 3134 3135 3136 3137 3138 3139 3140 3141 3142 3143 3144 3145 3146 3147
static unsigned int
num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
{
	int len;
	unsigned int entrycount = 0;
	unsigned int next_offset = 0;
	FILE_DIRECTORY_INFO *entryptr;

	if (bufstart == NULL)
		return 0;

	entryptr = (FILE_DIRECTORY_INFO *)bufstart;

	while (1) {
		entryptr = (FILE_DIRECTORY_INFO *)
					((char *)entryptr + next_offset);

		if ((char *)entryptr + size > end_of_buf) {
3148
			cifs_dbg(VFS, "malformed search entry would overflow\n");
3149 3150 3151 3152 3153
			break;
		}

		len = le32_to_cpu(entryptr->FileNameLength);
		if ((char *)entryptr + len + size > end_of_buf) {
3154 3155
			cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
				 end_of_buf);
3156 3157 3158 3159 3160 3161 3162 3163 3164 3165 3166 3167 3168 3169 3170 3171 3172 3173 3174 3175 3176 3177 3178 3179 3180
			break;
		}

		*lastentry = (char *)entryptr;
		entrycount++;

		next_offset = le32_to_cpu(entryptr->NextEntryOffset);
		if (!next_offset)
			break;
	}

	return entrycount;
}

/*
 * Readdir/FindFirst
 */
int
SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
		     u64 persistent_fid, u64 volatile_fid, int index,
		     struct cifs_search_info *srch_inf)
{
	struct smb2_query_directory_req *req;
	struct smb2_query_directory_rsp *rsp = NULL;
	struct kvec iov[2];
3181
	struct kvec rsp_iov;
3182 3183
	int rc = 0;
	int len;
3184
	int resp_buftype = CIFS_NO_BUFFER;
3185 3186 3187 3188 3189 3190 3191
	unsigned char *bufptr;
	struct TCP_Server_Info *server;
	struct cifs_ses *ses = tcon->ses;
	__le16 asteriks = cpu_to_le16('*');
	char *end_of_smb;
	unsigned int output_size = CIFSMaxBufSize;
	size_t info_buf_size;
3192
	int flags = 0;
3193
	unsigned int total_len;
3194 3195 3196 3197 3198 3199

	if (ses && (ses->server))
		server = ses->server;
	else
		return -EIO;

3200 3201
	rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req,
			     &total_len);
3202 3203 3204
	if (rc)
		return rc;

3205 3206 3207
	if (encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

3208 3209 3210 3211 3212 3213 3214 3215 3216 3217
	switch (srch_inf->info_level) {
	case SMB_FIND_FILE_DIRECTORY_INFO:
		req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
		info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
		break;
	case SMB_FIND_FILE_ID_FULL_DIR_INFO:
		req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
		info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
		break;
	default:
3218 3219
		cifs_dbg(VFS, "info level %u isn't supported\n",
			 srch_inf->info_level);
3220 3221 3222 3223 3224 3225 3226 3227 3228 3229 3230 3231 3232
		rc = -EINVAL;
		goto qdir_exit;
	}

	req->FileIndex = cpu_to_le32(index);
	req->PersistentFileId = persistent_fid;
	req->VolatileFileId = volatile_fid;

	len = 0x2;
	bufptr = req->Buffer;
	memcpy(bufptr, &asteriks, len);

	req->FileNameOffset =
3233
		cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1);
3234 3235 3236 3237 3238 3239 3240 3241 3242 3243
	req->FileNameLength = cpu_to_le16(len);
	/*
	 * BB could be 30 bytes or so longer if we used SMB2 specific
	 * buffer lengths, but this is safe and close enough.
	 */
	output_size = min_t(unsigned int, output_size, server->maxBuf);
	output_size = min_t(unsigned int, output_size, 2 << 15);
	req->OutputBufferLength = cpu_to_le32(output_size);

	iov[0].iov_base = (char *)req;
3244 3245
	/* 1 for Buffer */
	iov[0].iov_len = total_len - 1;
3246 3247 3248 3249

	iov[1].iov_base = (char *)(req->Buffer);
	iov[1].iov_len = len;

3250
	rc = smb2_send_recv(xid, ses, iov, 2, &resp_buftype, flags, &rsp_iov);
3251 3252
	cifs_small_buf_release(req);
	rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
3253

3254
	if (rc) {
3255 3256
		if (rc == -ENODATA &&
		    rsp->hdr.sync_hdr.Status == STATUS_NO_MORE_FILES) {
3257 3258 3259
			srch_inf->endOfSearch = true;
			rc = 0;
		}
3260 3261 3262 3263
		cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
		goto qdir_exit;
	}

3264 3265 3266
	rc = validate_iov(server,
			  le16_to_cpu(rsp->OutputBufferOffset),
			  le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
3267 3268 3269 3270 3271 3272 3273 3274 3275 3276 3277 3278 3279 3280 3281 3282 3283 3284 3285 3286 3287
			  info_buf_size);
	if (rc)
		goto qdir_exit;

	srch_inf->unicode = true;

	if (srch_inf->ntwrk_buf_start) {
		if (srch_inf->smallBuf)
			cifs_small_buf_release(srch_inf->ntwrk_buf_start);
		else
			cifs_buf_release(srch_inf->ntwrk_buf_start);
	}
	srch_inf->ntwrk_buf_start = (char *)rsp;
	srch_inf->srch_entries_start = srch_inf->last_entry = 4 /* rfclen */ +
		(char *)&rsp->hdr + le16_to_cpu(rsp->OutputBufferOffset);
	/* 4 for rfc1002 length field */
	end_of_smb = get_rfc1002_length(rsp) + 4 + (char *)&rsp->hdr;
	srch_inf->entries_in_buffer =
			num_entries(srch_inf->srch_entries_start, end_of_smb,
				    &srch_inf->last_entry, info_buf_size);
	srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
3288 3289 3290
	cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
		 srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
		 srch_inf->srch_entries_start, srch_inf->last_entry);
3291 3292 3293 3294 3295
	if (resp_buftype == CIFS_LARGE_BUFFER)
		srch_inf->smallBuf = false;
	else if (resp_buftype == CIFS_SMALL_BUFFER)
		srch_inf->smallBuf = true;
	else
3296
		cifs_dbg(VFS, "illegal search buffer type\n");
3297 3298 3299 3300 3301 3302 3303 3304

	return rc;

qdir_exit:
	free_rsp_buf(resp_buftype, rsp);
	return rc;
}

3305 3306
static int
send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
3307 3308 3309
	       u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
	       u8 info_type, u32 additional_info, unsigned int num,
		void **data, unsigned int *size)
3310 3311 3312 3313
{
	struct smb2_set_info_req *req;
	struct smb2_set_info_rsp *rsp = NULL;
	struct kvec *iov;
3314
	struct kvec rsp_iov;
3315 3316 3317 3318
	int rc = 0;
	int resp_buftype;
	unsigned int i;
	struct cifs_ses *ses = tcon->ses;
3319
	int flags = 0;
3320
	unsigned int total_len;
3321

3322
	if (!ses || !(ses->server))
3323 3324 3325 3326 3327 3328 3329 3330 3331
		return -EIO;

	if (!num)
		return -EINVAL;

	iov = kmalloc(sizeof(struct kvec) * num, GFP_KERNEL);
	if (!iov)
		return -ENOMEM;

3332
	rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, (void **) &req, &total_len);
3333 3334 3335 3336 3337
	if (rc) {
		kfree(iov);
		return rc;
	}

3338 3339 3340
	if (encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

3341
	req->sync_hdr.ProcessId = cpu_to_le32(pid);
3342

3343
	req->InfoType = info_type;
3344 3345 3346
	req->FileInfoClass = info_class;
	req->PersistentFileId = persistent_fid;
	req->VolatileFileId = volatile_fid;
3347
	req->AdditionalInformation = cpu_to_le32(additional_info);
3348 3349

	req->BufferOffset =
3350
			cpu_to_le16(sizeof(struct smb2_set_info_req) - 1);
3351 3352 3353
	req->BufferLength = cpu_to_le32(*size);

	memcpy(req->Buffer, *data, *size);
3354
	total_len += *size;
3355 3356

	iov[0].iov_base = (char *)req;
3357 3358
	/* 1 for Buffer */
	iov[0].iov_len = total_len - 1;
3359 3360 3361 3362 3363 3364 3365

	for (i = 1; i < num; i++) {
		le32_add_cpu(&req->BufferLength, size[i]);
		iov[i].iov_base = (char *)data[i];
		iov[i].iov_len = size[i];
	}

3366 3367
	rc = smb2_send_recv(xid, ses, iov, num, &resp_buftype, flags,
			    &rsp_iov);
3368 3369
	cifs_small_buf_release(req);
	rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
3370

3371
	if (rc != 0)
3372
		cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
3373

3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386 3387 3388 3389 3390 3391 3392 3393 3394 3395 3396 3397 3398 3399 3400 3401 3402 3403 3404
	free_rsp_buf(resp_buftype, rsp);
	kfree(iov);
	return rc;
}

int
SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
	    u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
{
	struct smb2_file_rename_info info;
	void **data;
	unsigned int size[2];
	int rc;
	int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));

	data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	info.ReplaceIfExists = 1; /* 1 = replace existing target with new */
			      /* 0 = fail if target already exists */
	info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
	info.FileNameLength = cpu_to_le32(len);

	data[0] = &info;
	size[0] = sizeof(struct smb2_file_rename_info);

	data[1] = target_file;
	size[1] = len + 2 /* null */;

	rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
3405 3406
		current->tgid, FILE_RENAME_INFORMATION, SMB2_O_INFO_FILE,
		0, 2, data, size);
3407 3408 3409
	kfree(data);
	return rc;
}
3410

3411 3412 3413 3414 3415 3416 3417 3418 3419 3420 3421 3422
int
SMB2_rmdir(const unsigned int xid, struct cifs_tcon *tcon,
		  u64 persistent_fid, u64 volatile_fid)
{
	__u8 delete_pending = 1;
	void *data;
	unsigned int size;

	data = &delete_pending;
	size = 1; /* sizeof __u8 */

	return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3423 3424
		current->tgid, FILE_DISPOSITION_INFORMATION, SMB2_O_INFO_FILE,
		0, 1, &data, &size);
3425 3426
}

3427 3428 3429 3430 3431 3432 3433 3434 3435 3436 3437 3438 3439 3440 3441 3442 3443 3444 3445 3446 3447 3448 3449 3450 3451 3452
int
SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
		  u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
{
	struct smb2_file_link_info info;
	void **data;
	unsigned int size[2];
	int rc;
	int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));

	data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	info.ReplaceIfExists = 0; /* 1 = replace existing link with new */
			      /* 0 = fail if link already exists */
	info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
	info.FileNameLength = cpu_to_le32(len);

	data[0] = &info;
	size[0] = sizeof(struct smb2_file_link_info);

	data[1] = target_file;
	size[1] = len + 2 /* null */;

	rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
3453 3454
			current->tgid, FILE_LINK_INFORMATION, SMB2_O_INFO_FILE,
			0, 2, data, size);
3455 3456 3457
	kfree(data);
	return rc;
}
3458 3459 3460

int
SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3461
	     u64 volatile_fid, u32 pid, __le64 *eof, bool is_falloc)
3462 3463 3464 3465 3466 3467 3468 3469 3470 3471
{
	struct smb2_file_eof_info info;
	void *data;
	unsigned int size;

	info.EndOfFile = *eof;

	data = &info;
	size = sizeof(struct smb2_file_eof_info);

3472 3473
	if (is_falloc)
		return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3474 3475
			pid, FILE_ALLOCATION_INFORMATION, SMB2_O_INFO_FILE,
			0, 1, &data, &size);
3476 3477
	else
		return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3478 3479
			pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
			0, 1, &data, &size);
3480
}
3481 3482 3483 3484 3485 3486 3487 3488

int
SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon,
	      u64 persistent_fid, u64 volatile_fid, FILE_BASIC_INFO *buf)
{
	unsigned int size;
	size = sizeof(FILE_BASIC_INFO);
	return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3489 3490 3491 3492 3493 3494 3495 3496 3497 3498 3499 3500
		current->tgid, FILE_BASIC_INFORMATION, SMB2_O_INFO_FILE,
		0, 1, (void **)&buf, &size);
}

int
SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,
		u64 persistent_fid, u64 volatile_fid,
		struct cifs_ntsd *pnntsd, int pacllen, int aclflag)
{
	return send_set_info(xid, tcon, persistent_fid, volatile_fid,
			current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag,
			1, (void **)&pnntsd, &pacllen);
3501
}
3502

3503 3504 3505 3506 3507 3508 3509 3510 3511 3512
int
SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
	    u64 persistent_fid, u64 volatile_fid,
	    struct smb2_file_full_ea_info *buf, int len)
{
	return send_set_info(xid, tcon, persistent_fid, volatile_fid,
		current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE,
		0, 1, (void **)&buf, &len);
}

3513 3514 3515 3516 3517 3518
int
SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
		  const u64 persistent_fid, const u64 volatile_fid,
		  __u8 oplock_level)
{
	int rc;
3519 3520
	struct smb2_oplock_break_req *req = NULL;
	struct cifs_ses *ses = tcon->ses;
3521
	int flags = CIFS_OBREAK_OP;
3522 3523 3524 3525
	unsigned int total_len;
	struct kvec iov[1];
	struct kvec rsp_iov;
	int resp_buf_type;
3526

3527
	cifs_dbg(FYI, "SMB2_oplock_break\n");
3528 3529
	rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req,
			     &total_len);
3530 3531 3532
	if (rc)
		return rc;

3533 3534 3535
	if (encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

3536 3537 3538
	req->VolatileFid = volatile_fid;
	req->PersistentFid = persistent_fid;
	req->OplockLevel = oplock_level;
3539
	req->sync_hdr.CreditRequest = cpu_to_le16(1);
3540

3541 3542 3543 3544 3545 3546
	flags |= CIFS_NO_RESP;

	iov[0].iov_base = (char *)req;
	iov[0].iov_len = total_len;

	rc = smb2_send_recv(xid, ses, iov, 1, &resp_buf_type, flags, &rsp_iov);
3547
	cifs_small_buf_release(req);
3548 3549 3550

	if (rc) {
		cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
3551
		cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
3552 3553 3554 3555
	}

	return rc;
}
3556 3557 3558 3559 3560 3561 3562 3563

static void
copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
			struct kstatfs *kst)
{
	kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
			  le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
	kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
3564 3565
	kst->f_bfree  = kst->f_bavail =
			le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
3566 3567 3568 3569 3570 3571 3572
	return;
}

static int
build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
		   int outbuf_len, u64 persistent_fid, u64 volatile_fid)
{
3573
	struct TCP_Server_Info *server;
3574 3575
	int rc;
	struct smb2_query_info_req *req;
3576
	unsigned int total_len;
3577

3578
	cifs_dbg(FYI, "Query FSInfo level %d\n", level);
3579 3580 3581 3582

	if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
		return -EIO;

3583 3584
	server = tcon->ses->server;

3585 3586
	rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req,
			     &total_len);
3587 3588 3589 3590 3591 3592 3593
	if (rc)
		return rc;

	req->InfoType = SMB2_O_INFO_FILESYSTEM;
	req->FileInfoClass = level;
	req->PersistentFileId = persistent_fid;
	req->VolatileFileId = volatile_fid;
3594
	/* 1 for pad */
3595
	req->InputBufferOffset =
3596
			cpu_to_le16(sizeof(struct smb2_query_info_req) - 1);
3597
	req->OutputBufferLength = cpu_to_le32(
3598
		outbuf_len + sizeof(struct smb2_query_info_rsp) - 1 - server->vals->header_preamble_size);
3599 3600

	iov->iov_base = (char *)req;
3601
	iov->iov_len = total_len;
3602 3603 3604 3605 3606 3607 3608 3609 3610
	return 0;
}

int
SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
	      u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
{
	struct smb2_query_info_rsp *rsp = NULL;
	struct kvec iov;
3611
	struct kvec rsp_iov;
3612 3613 3614
	int rc = 0;
	int resp_buftype;
	struct cifs_ses *ses = tcon->ses;
3615
	struct TCP_Server_Info *server = ses->server;
3616
	struct smb2_fs_full_size_info *info = NULL;
3617
	int flags = 0;
3618 3619 3620 3621 3622 3623 3624

	rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
				sizeof(struct smb2_fs_full_size_info),
				persistent_fid, volatile_fid);
	if (rc)
		return rc;

3625 3626 3627
	if (encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

3628
	rc = smb2_send_recv(xid, ses, &iov, 1, &resp_buftype, flags, &rsp_iov);
3629
	cifs_small_buf_release(iov.iov_base);
3630 3631
	if (rc) {
		cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3632
		goto qfsinf_exit;
3633
	}
3634
	rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3635

3636
	info = (struct smb2_fs_full_size_info *)(server->vals->header_preamble_size +
3637
		le16_to_cpu(rsp->OutputBufferOffset) + (char *)&rsp->hdr);
3638 3639 3640
	rc = validate_iov(server,
			  le16_to_cpu(rsp->OutputBufferOffset),
			  le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
3641 3642 3643 3644
			  sizeof(struct smb2_fs_full_size_info));
	if (!rc)
		copy_fs_info_to_kstatfs(info, fsdata);

3645
qfsinf_exit:
3646
	free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3647 3648 3649 3650 3651
	return rc;
}

int
SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
3652
	      u64 persistent_fid, u64 volatile_fid, int level)
3653 3654 3655
{
	struct smb2_query_info_rsp *rsp = NULL;
	struct kvec iov;
3656
	struct kvec rsp_iov;
3657
	int rc = 0;
3658
	int resp_buftype, max_len, min_len;
3659
	struct cifs_ses *ses = tcon->ses;
3660
	struct TCP_Server_Info *server = ses->server;
3661
	unsigned int rsp_len, offset;
3662
	int flags = 0;
3663

3664 3665 3666 3667 3668 3669
	if (level == FS_DEVICE_INFORMATION) {
		max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
		min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
	} else if (level == FS_ATTRIBUTE_INFORMATION) {
		max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
		min_len = MIN_FS_ATTR_INFO_SIZE;
S
Steven French 已提交
3670 3671 3672
	} else if (level == FS_SECTOR_SIZE_INFORMATION) {
		max_len = sizeof(struct smb3_fs_ss_info);
		min_len = sizeof(struct smb3_fs_ss_info);
3673
	} else {
S
Steven French 已提交
3674
		cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
3675 3676 3677 3678
		return -EINVAL;
	}

	rc = build_qfs_info_req(&iov, tcon, level, max_len,
3679 3680 3681 3682
				persistent_fid, volatile_fid);
	if (rc)
		return rc;

3683 3684 3685
	if (encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

3686
	rc = smb2_send_recv(xid, ses, &iov, 1, &resp_buftype, flags, &rsp_iov);
3687
	cifs_small_buf_release(iov.iov_base);
3688 3689 3690 3691
	if (rc) {
		cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
		goto qfsattr_exit;
	}
3692
	rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3693 3694 3695

	rsp_len = le32_to_cpu(rsp->OutputBufferLength);
	offset = le16_to_cpu(rsp->OutputBufferOffset);
3696
	rc = validate_iov(server, offset, rsp_len, &rsp_iov, min_len);
3697 3698 3699 3700
	if (rc)
		goto qfsattr_exit;

	if (level == FS_ATTRIBUTE_INFORMATION)
3701
		memcpy(&tcon->fsAttrInfo, server->vals->header_preamble_size + offset
3702
			+ (char *)&rsp->hdr, min_t(unsigned int,
3703 3704
			rsp_len, max_len));
	else if (level == FS_DEVICE_INFORMATION)
3705
		memcpy(&tcon->fsDevInfo, server->vals->header_preamble_size + offset
3706
			+ (char *)&rsp->hdr, sizeof(FILE_SYSTEM_DEVICE_INFO));
S
Steven French 已提交
3707 3708
	else if (level == FS_SECTOR_SIZE_INFORMATION) {
		struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
3709
			(server->vals->header_preamble_size + offset + (char *)&rsp->hdr);
S
Steven French 已提交
3710 3711 3712 3713
		tcon->ss_flags = le32_to_cpu(ss_info->Flags);
		tcon->perf_sector_size =
			le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
	}
3714 3715

qfsattr_exit:
3716
	free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3717 3718
	return rc;
}
3719 3720 3721 3722 3723 3724 3725 3726 3727

int
smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
	   const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
	   const __u32 num_lock, struct smb2_lock_element *buf)
{
	int rc = 0;
	struct smb2_lock_req *req = NULL;
	struct kvec iov[2];
3728
	struct kvec rsp_iov;
3729 3730
	int resp_buf_type;
	unsigned int count;
3731
	int flags = CIFS_NO_RESP;
3732
	unsigned int total_len;
3733

3734
	cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
3735

3736
	rc = smb2_plain_req_init(SMB2_LOCK, tcon, (void **) &req, &total_len);
3737 3738 3739
	if (rc)
		return rc;

3740 3741 3742
	if (encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

3743
	req->sync_hdr.ProcessId = cpu_to_le32(pid);
3744 3745 3746 3747 3748 3749 3750 3751
	req->LockCount = cpu_to_le16(num_lock);

	req->PersistentFileId = persist_fid;
	req->VolatileFileId = volatile_fid;

	count = num_lock * sizeof(struct smb2_lock_element);

	iov[0].iov_base = (char *)req;
3752
	iov[0].iov_len = total_len - sizeof(struct smb2_lock_element);
3753 3754 3755 3756
	iov[1].iov_base = (char *)buf;
	iov[1].iov_len = count;

	cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
3757 3758
	rc = smb2_send_recv(xid, tcon->ses, iov, 2, &resp_buf_type, flags,
			    &rsp_iov);
3759
	cifs_small_buf_release(req);
3760
	if (rc) {
3761
		cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
3762 3763 3764 3765 3766 3767 3768 3769 3770 3771 3772 3773 3774 3775 3776 3777 3778 3779 3780 3781 3782 3783
		cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
	}

	return rc;
}

int
SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
	  const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
	  const __u64 length, const __u64 offset, const __u32 lock_flags,
	  const bool wait)
{
	struct smb2_lock_element lock;

	lock.Offset = cpu_to_le64(offset);
	lock.Length = cpu_to_le64(length);
	lock.Flags = cpu_to_le32(lock_flags);
	if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
		lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);

	return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
}
3784 3785 3786 3787 3788 3789 3790

int
SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
		 __u8 *lease_key, const __le32 lease_state)
{
	int rc;
	struct smb2_lease_ack *req = NULL;
3791
	struct cifs_ses *ses = tcon->ses;
3792
	int flags = CIFS_OBREAK_OP;
3793 3794 3795 3796
	unsigned int total_len;
	struct kvec iov[1];
	struct kvec rsp_iov;
	int resp_buf_type;
3797

3798
	cifs_dbg(FYI, "SMB2_lease_break\n");
3799 3800
	rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req,
			     &total_len);
3801 3802 3803
	if (rc)
		return rc;

3804 3805 3806
	if (encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

3807
	req->sync_hdr.CreditRequest = cpu_to_le16(1);
3808
	req->StructureSize = cpu_to_le16(36);
3809
	total_len += 12;
3810 3811 3812 3813

	memcpy(req->LeaseKey, lease_key, 16);
	req->LeaseState = lease_state;

3814 3815 3816 3817 3818 3819
	flags |= CIFS_NO_RESP;

	iov[0].iov_base = (char *)req;
	iov[0].iov_len = total_len;

	rc = smb2_send_recv(xid, ses, iov, 1, &resp_buf_type, flags, &rsp_iov);
3820
	cifs_small_buf_release(req);
3821 3822 3823

	if (rc) {
		cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
3824
		cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
3825 3826 3827 3828
	}

	return rc;
}