smb2pdu.c 96.5 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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/*
 *  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)
		goto out;
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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)
330
{
331
	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;
	pneg_ctxt->DataLength = cpu_to_le16(6);
	pneg_ctxt->CipherCount = cpu_to_le16(2);
	pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
	pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES128_CCM;
}

static void
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assemble_neg_contexts(struct smb2_negotiate_req *req,
		      unsigned int *total_len)
391
{
392
	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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}
#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;
442

443
	cifs_dbg(FYI, "Negotiate protocol\n");
444

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

450
	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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	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);
479
	else if (global_secflags & CIFSSEC_MAY_SIGN)
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		req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
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	else
		req->SecurityMode = 0;
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484
	req->Capabilities = cpu_to_le32(ses->server->vals->req_capabilities);
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	/* 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);
489
	else {
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		memcpy(req->ClientGUID, server->client_guid,
			SMB2_CLIENT_GUID_SIZE);
492
		if (ses->server->vals->protocol_id == SMB311_PROT_ID)
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			assemble_neg_contexts(req, &total_len);
494
	}
495
	iov[0].iov_base = (char *)req;
496
	iov[0].iov_len = total_len;
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498
	rc = smb2_send_recv(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
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	cifs_small_buf_release(req);
	rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base;
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	/*
	 * No tcon so can't do
	 * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
	 */
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	if (rc == -EOPNOTSUPP) {
		cifs_dbg(VFS, "Dialect not supported by server. Consider "
507
			"specifying vers=1.0 or vers=2.0 on mount for accessing"
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			" older servers\n");
		goto neg_exit;
	} else if (rc != 0)
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		goto neg_exit;

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	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;
		}
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	} else if (le16_to_cpu(rsp->DialectRevision) !=
				ses->server->vals->protocol_id) {
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		/* if requested single dialect ensure returned dialect matched */
		cifs_dbg(VFS, "Illegal 0x%x dialect returned: not requested\n",
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			le16_to_cpu(rsp->DialectRevision));
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		return -EIO;
	}

542
	cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
543

544
	if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
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		cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
546
	else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
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		cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
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	else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
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		cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
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	else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
		cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
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#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 */
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	else {
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		cifs_dbg(VFS, "Illegal dialect returned by server 0x%x\n",
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			 le16_to_cpu(rsp->DialectRevision));
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		rc = -EIO;
		goto neg_exit;
	}
	server->dialect = le16_to_cpu(rsp->DialectRevision);

564 565
	/* BB: add check that dialect was valid given dialect(s) we asked for */

566 567
	/* SMB2 only has an extended negflavor */
	server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
568 569 570
	/* 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);
571 572 573 574 575
	server->max_read = le32_to_cpu(rsp->MaxReadSize);
	server->max_write = le32_to_cpu(rsp->MaxWriteSize);
	/* BB Do we need to validate the SecurityMode? */
	server->sec_mode = le16_to_cpu(rsp->SecurityMode);
	server->capabilities = le32_to_cpu(rsp->Capabilities);
576 577
	/* Internal types */
	server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
578 579 580

	security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
					       &rsp->hdr);
581 582 583 584 585 586 587
	/*
	 * 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.
	 */
588
	if (blob_length == 0) {
589
		cifs_dbg(FYI, "missing security blob on negprot\n");
590 591
		server->sec_ntlmssp = true;
	}
P
Pavel Shilovsky 已提交
592

593
	rc = cifs_enable_signing(server, ses->sign);
594 595
	if (rc)
		goto neg_exit;
596
	if (blob_length) {
597
		rc = decode_negTokenInit(security_blob, blob_length, server);
598 599 600 601
		if (rc == 1)
			rc = 0;
		else if (rc == 0)
			rc = -EIO;
602 603 604 605 606
	}
neg_exit:
	free_rsp_buf(resp_buftype, rsp);
	return rc;
}
607

608 609 610 611
int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
{
	int rc = 0;
	struct validate_negotiate_info_req vneg_inbuf;
612
	struct validate_negotiate_info_rsp *pneg_rsp = NULL;
613
	u32 rsplen;
614
	u32 inbuflen; /* max of 4 dialects */
615 616 617 618 619

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

	/*
	 * validation ioctl must be signed, so no point sending this if we
620 621
	 * can not sign it (ie are not known user).  Even if signing is not
	 * required (enabled but not negotiated), in those cases we selectively
622
	 * sign just this, the first and only signed request on a connection.
623
	 * Having validation of negotiate info  helps reduce attack vectors.
624
	 */
625
	if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
626 627
		return 0; /* validation requires signing */

628 629 630 631 632 633 634 635
	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");

636 637
	vneg_inbuf.Capabilities =
			cpu_to_le32(tcon->ses->server->vals->req_capabilities);
638 639
	memcpy(vneg_inbuf.Guid, tcon->ses->server->client_guid,
					SMB2_CLIENT_GUID_SIZE);
640 641 642 643 644 645 646 647 648 649

	if (tcon->ses->sign)
		vneg_inbuf.SecurityMode =
			cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
	else if (global_secflags & CIFSSEC_MAY_SIGN)
		vneg_inbuf.SecurityMode =
			cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
	else
		vneg_inbuf.SecurityMode = 0;

650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673

	if (strcmp(tcon->ses->server->vals->version_string,
		SMB3ANY_VERSION_STRING) == 0) {
		vneg_inbuf.Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
		vneg_inbuf.Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
		vneg_inbuf.DialectCount = cpu_to_le16(2);
		/* structure is big enough for 3 dialects, sending only 2 */
		inbuflen = sizeof(struct validate_negotiate_info_req) - 2;
	} else if (strcmp(tcon->ses->server->vals->version_string,
		SMBDEFAULT_VERSION_STRING) == 0) {
		vneg_inbuf.Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
		vneg_inbuf.Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
		vneg_inbuf.Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
		vneg_inbuf.DialectCount = cpu_to_le16(3);
		/* structure is big enough for 3 dialects */
		inbuflen = sizeof(struct validate_negotiate_info_req);
	} else {
		/* otherwise specific dialect was requested */
		vneg_inbuf.Dialects[0] =
			cpu_to_le16(tcon->ses->server->vals->protocol_id);
		vneg_inbuf.DialectCount = cpu_to_le16(1);
		/* structure is big enough for 3 dialects, sending only 1 */
		inbuflen = sizeof(struct validate_negotiate_info_req) - 4;
	}
674 675 676

	rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
		FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
677
		false /* use_ipc */,
678 679 680 681 682 683 684 685 686
		(char *)&vneg_inbuf, sizeof(struct validate_negotiate_info_req),
		(char **)&pneg_rsp, &rsplen);

	if (rc != 0) {
		cifs_dbg(VFS, "validate protocol negotiate failed: %d\n", rc);
		return -EIO;
	}

	if (rsplen != sizeof(struct validate_negotiate_info_rsp)) {
687 688 689 690
		cifs_dbg(VFS, "invalid protocol negotiate response size: %d\n",
			 rsplen);

		/* relax check since Mac returns max bufsize allowed on ioctl */
691 692
		if ((rsplen > CIFSMaxBufSize)
		     || (rsplen < sizeof(struct validate_negotiate_info_rsp)))
693
			goto err_rsp_free;
694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711
	}

	/* check validate negotiate info response matches what we got earlier */
	if (pneg_rsp->Dialect !=
			cpu_to_le16(tcon->ses->server->vals->protocol_id))
		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 */
	cifs_dbg(FYI, "validate negotiate info successful\n");
712
	kfree(pneg_rsp);
713 714 715 716
	return 0;

vneg_out:
	cifs_dbg(VFS, "protocol revalidation - security settings mismatch\n");
717 718
err_rsp_free:
	kfree(pneg_rsp);
719 720 721
	return -EIO;
}

S
Sachin Prabhu 已提交
722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743
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;
	}
}

744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769
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;
770
	unsigned int total_len;
771

772 773
	rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, (void **) &req,
			     &total_len);
774 775 776
	if (rc)
		return rc;

777
	/* First session, not a reauthenticate */
778
	req->sync_hdr.SessionId = 0;
779 780 781 782 783 784

	/* 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 */
785
	req->sync_hdr.CreditRequest = cpu_to_le16(3);
786 787 788 789 790 791 792 793 794 795 796 797 798

	/* 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;
799 800
	/* 1 for pad */
	sess_data->iov[0].iov_len = total_len - 1;
801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821
	/*
	 * 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;
822
	struct kvec rsp_iov = { NULL, 0 };
823 824 825

	/* Testing shows that buffer offset must be at location of Buffer[0] */
	req->SecurityBufferOffset =
826
		cpu_to_le16(sizeof(struct smb2_sess_setup_req) - 1 /* pad */);
827 828 829 830
	req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);

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

831 832 833 834
	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);
835 836
	cifs_small_buf_release(sess_data->iov[0].iov_base);
	memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
837 838 839 840 841 842 843 844 845 846 847

	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);
848
	if (ses->server->ops->generate_signingkey) {
849 850 851 852 853
		rc = ses->server->ops->generate_signingkey(ses);
		if (rc) {
			cifs_dbg(FYI,
				"SMB3 session key generation failed\n");
			mutex_unlock(&ses->server->srv_mutex);
854
			return rc;
855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923
		}
	}
	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;
924
	ses->Suid = rsp->hdr.sync_hdr.SessionId;
925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946

	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

947 948 949 950 951
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)
952
{
953 954
	int rc;
	struct cifs_ses *ses = sess_data->ses;
955
	struct smb2_sess_setup_rsp *rsp = NULL;
956
	char *ntlmssp_blob = NULL;
957
	bool use_spnego = false; /* else use raw ntlmssp */
958
	u16 blob_length = 0;
959

960 961 962 963 964
	/*
	 * If memory allocation is successful, caller of this function
	 * frees it.
	 */
	ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
965 966 967 968
	if (!ses->ntlmssp) {
		rc = -ENOMEM;
		goto out_err;
	}
969
	ses->ntlmssp->sesskey_per_smbsess = true;
970

971
	rc = SMB2_sess_alloc_buffer(sess_data);
972
	if (rc)
973
		goto out_err;
974

975 976 977 978 979 980
	ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
			       GFP_KERNEL);
	if (ntlmssp_blob == NULL) {
		rc = -ENOMEM;
		goto out;
	}
981

982 983 984 985 986 987 988 989 990 991 992 993
	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;
994

995 996
	rc = SMB2_sess_sendreceive(sess_data);
	rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
997

998 999
	/* If true, rc here is expected and not an error */
	if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1000
		rsp->hdr.sync_hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
1001
		rc = 0;
1002

1003 1004
	if (rc)
		goto out;
1005

1006 1007 1008 1009
	if (offsetof(struct smb2_sess_setup_rsp, Buffer) - 4 !=
			le16_to_cpu(rsp->SecurityBufferOffset)) {
		cifs_dbg(VFS, "Invalid security buffer offset %d\n",
			le16_to_cpu(rsp->SecurityBufferOffset));
1010
		rc = -EIO;
1011
		goto out;
1012
	}
1013 1014 1015 1016
	rc = decode_ntlmssp_challenge(rsp->Buffer,
			le16_to_cpu(rsp->SecurityBufferLength), ses);
	if (rc)
		goto out;
1017

1018
	cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1019 1020


1021
	ses->Suid = rsp->hdr.sync_hdr.SessionId;
1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037
	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;
}
1038

1039 1040 1041 1042 1043 1044 1045 1046 1047 1048
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;
1049

1050 1051 1052
	rc = SMB2_sess_alloc_buffer(sess_data);
	if (rc)
		goto out;
1053

1054
	req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
1055
	req->sync_hdr.SessionId = ses->Suid;
1056 1057 1058 1059 1060 1061

	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;
1062 1063
	}

1064 1065 1066 1067 1068 1069 1070 1071
	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;
1072

1073 1074 1075 1076 1077 1078
	rc = SMB2_sess_sendreceive(sess_data);
	if (rc)
		goto out;

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

1079
	ses->Suid = rsp->hdr.sync_hdr.SessionId;
1080 1081
	ses->session_flags = le16_to_cpu(rsp->SessionFlags);

1082 1083 1084 1085 1086 1087 1088 1089 1090
	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;
}
1091

1092 1093 1094
static int
SMB2_select_sec(struct cifs_ses *ses, struct SMB2_sess_data *sess_data)
{
S
Sachin Prabhu 已提交
1095 1096 1097 1098 1099 1100 1101 1102 1103
	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;
	}
1104

S
Sachin Prabhu 已提交
1105
	switch (type) {
1106 1107 1108 1109 1110 1111 1112
	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
1113
		cifs_dbg(VFS, "secType %d not supported!\n", type);
1114
		return -EOPNOTSUPP;
1115 1116
	}

1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132
	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;
1133 1134
	}

1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149
	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;

	while (sess_data->func)
		sess_data->func(sess_data);

1150 1151
	if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign))
		cifs_dbg(VFS, "signing requested but authenticated as guest\n");
1152
	rc = sess_data->result;
1153
out:
1154
	kfree(sess_data);
1155 1156 1157 1158 1159 1160 1161 1162 1163
	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;
1164
	int flags = 0;
1165 1166 1167 1168
	unsigned int total_len;
	struct kvec iov[1];
	struct kvec rsp_iov;
	int resp_buf_type;
1169

1170
	cifs_dbg(FYI, "disconnect session %p\n", ses);
1171 1172 1173 1174 1175 1176

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

1177 1178 1179 1180
	/* no need to send SMB logoff if uid already closed due to reconnect */
	if (ses->need_reconnect)
		goto smb2_session_already_dead;

1181
	rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, (void **) &req, &total_len);
1182 1183 1184 1185
	if (rc)
		return rc;

	 /* since no tcon, smb2_init can not do this, so do here */
1186
	req->sync_hdr.SessionId = ses->Suid;
1187 1188 1189 1190

	if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
		flags |= CIFS_TRANSFORM_REQ;
	else if (server->sign)
1191 1192 1193 1194 1195 1196
		req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;

	flags |= CIFS_NO_RESP;

	iov[0].iov_base = (char *)req;
	iov[0].iov_len = total_len;
1197

1198
	rc = smb2_send_recv(xid, ses, iov, 1, &resp_buf_type, flags, &rsp_iov);
1199
	cifs_small_buf_release(req);
1200 1201 1202 1203
	/*
	 * No tcon so can't do
	 * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
	 */
1204 1205

smb2_session_already_dead:
1206 1207
	return rc;
}
1208 1209 1210

static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
{
1211
	cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
1212 1213 1214 1215
}

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

S
Steve French 已提交
1216 1217 1218 1219 1220 1221 1222 1223
/* 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;
}

1224 1225 1226 1227 1228 1229 1230
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];
1231
	struct kvec rsp_iov = { NULL, 0 };
1232 1233 1234 1235
	int rc = 0;
	int resp_buftype;
	int unc_path_len;
	__le16 *unc_path = NULL;
1236
	int flags = 0;
1237
	unsigned int total_len;
1238

1239
	cifs_dbg(FYI, "TCON\n");
1240

1241
	if (!(ses->server) || !tree)
1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254
		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;
	}

1255 1256 1257 1258
	/* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
	if (tcon)
		tcon->tid = 0;

1259 1260
	rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, (void **) &req,
			     &total_len);
1261 1262 1263 1264 1265 1266
	if (rc) {
		kfree(unc_path);
		return rc;
	}

	if (tcon == NULL) {
1267 1268 1269
		if ((ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA))
			flags |= CIFS_TRANSFORM_REQ;

1270
		/* since no tcon, smb2_init can not do this, so do here */
1271
		req->sync_hdr.SessionId = ses->Suid;
1272
		if (ses->server->sign)
1273
			req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1274 1275
	} else if (encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;
1276 1277

	iov[0].iov_base = (char *)req;
1278 1279
	/* 1 for pad */
	iov[0].iov_len = total_len - 1;
1280 1281 1282

	/* Testing shows that buffer offset must be at location of Buffer[0] */
	req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
1283
			- 1 /* pad */);
1284 1285 1286 1287
	req->PathLength = cpu_to_le16(unc_path_len - 2);
	iov[1].iov_base = unc_path;
	iov[1].iov_len = unc_path_len;

1288
	rc = smb2_send_recv(xid, ses, iov, 2, &resp_buftype, flags, &rsp_iov);
1289 1290
	cifs_small_buf_release(req);
	rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
1291 1292 1293 1294 1295 1296 1297 1298 1299 1300

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

	if (tcon == NULL) {
1301
		ses->ipc_tid = rsp->hdr.sync_hdr.TreeId;
1302 1303 1304
		goto tcon_exit;
	}

1305 1306
	switch (rsp->ShareType) {
	case SMB2_SHARE_TYPE_DISK:
1307
		cifs_dbg(FYI, "connection to disk share\n");
1308 1309
		break;
	case SMB2_SHARE_TYPE_PIPE:
1310
		tcon->ipc = true;
1311
		cifs_dbg(FYI, "connection to pipe share\n");
1312 1313 1314
		break;
	case SMB2_SHARE_TYPE_PRINT:
		tcon->ipc = true;
1315
		cifs_dbg(FYI, "connection to printer\n");
1316 1317
		break;
	default:
1318
		cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
1319 1320 1321 1322 1323
		rc = -EOPNOTSUPP;
		goto tcon_error_exit;
	}

	tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
1324
	tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
1325 1326 1327
	tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
	tcon->tidStatus = CifsGood;
	tcon->need_reconnect = false;
1328
	tcon->tid = rsp->hdr.sync_hdr.TreeId;
1329
	strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
1330 1331 1332

	if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
	    ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
1333
		cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
1334 1335 1336 1337 1338

	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
1339
	init_copy_chunk_defaults(tcon);
1340 1341
	if (tcon->ses->server->ops->validate_negotiate)
		rc = tcon->ses->server->ops->validate_negotiate(xid, tcon);
1342 1343 1344 1345 1346 1347
tcon_exit:
	free_rsp_buf(resp_buftype, rsp);
	kfree(unc_path);
	return rc;

tcon_error_exit:
1348
	if (rsp && rsp->hdr.sync_hdr.Status == STATUS_BAD_NETWORK_NAME) {
1349
		cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1350 1351 1352 1353 1354 1355 1356 1357 1358 1359
	}
	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;
1360
	int flags = 0;
1361 1362 1363 1364
	unsigned int total_len;
	struct kvec iov[1];
	struct kvec rsp_iov;
	int resp_buf_type;
1365

1366
	cifs_dbg(FYI, "Tree Disconnect\n");
1367

1368
	if (!ses || !(ses->server))
1369 1370 1371 1372 1373
		return -EIO;

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

1374 1375
	rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req,
			     &total_len);
1376 1377 1378
	if (rc)
		return rc;

1379 1380 1381
	if (encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

1382 1383 1384 1385 1386 1387
	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);
1388
	cifs_small_buf_release(req);
1389 1390 1391 1392 1393
	if (rc)
		cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);

	return rc;
}
1394

P
Pavel Shilovsky 已提交
1395

1396 1397 1398 1399 1400 1401 1402 1403 1404 1405
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
1406
					(struct create_durable, Data));
1407 1408 1409 1410
	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);
1411
	/* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
1412 1413 1414 1415 1416 1417 1418
	buf->Name[0] = 'D';
	buf->Name[1] = 'H';
	buf->Name[2] = 'n';
	buf->Name[3] = 'Q';
	return buf;
}

1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435
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;
1436
	/* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
1437 1438 1439 1440 1441 1442 1443
	buf->Name[0] = 'D';
	buf->Name[1] = 'H';
	buf->Name[2] = 'n';
	buf->Name[3] = 'C';
	return buf;
}

P
Pavel Shilovsky 已提交
1444
static __u8
1445 1446
parse_lease_state(struct TCP_Server_Info *server, struct smb2_create_rsp *rsp,
		  unsigned int *epoch)
P
Pavel Shilovsky 已提交
1447 1448
{
	char *data_offset;
1449
	struct create_context *cc;
1450 1451
	unsigned int next;
	unsigned int remaining;
1452
	char *name;
P
Pavel Shilovsky 已提交
1453

1454
	data_offset = (char *)rsp + 4 + le32_to_cpu(rsp->CreateContextsOffset);
1455
	remaining = le32_to_cpu(rsp->CreateContextsLength);
1456
	cc = (struct create_context *)data_offset;
1457
	while (remaining >= sizeof(struct create_context)) {
1458
		name = le16_to_cpu(cc->NameOffset) + (char *)cc;
1459 1460 1461 1462 1463 1464 1465 1466 1467 1468
		if (le16_to_cpu(cc->NameLength) == 4 &&
		    strncmp(name, "RqLs", 4) == 0)
			return server->ops->parse_lease_buf(cc, epoch);

		next = le32_to_cpu(cc->Next);
		if (!next)
			break;
		remaining -= next;
		cc = (struct create_context *)((char *)cc + next);
	}
P
Pavel Shilovsky 已提交
1469

1470
	return 0;
P
Pavel Shilovsky 已提交
1471 1472
}

1473
static int
1474 1475
add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
		  unsigned int *num_iovec, __u8 *oplock)
1476 1477 1478 1479
{
	struct smb2_create_req *req = iov[0].iov_base;
	unsigned int num = *num_iovec;

1480
	iov[num].iov_base = server->ops->create_lease_buf(oplock+1, *oplock);
1481 1482
	if (iov[num].iov_base == NULL)
		return -ENOMEM;
1483
	iov[num].iov_len = server->vals->create_lease_size;
1484 1485 1486
	req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
	if (!req->CreateContextsOffset)
		req->CreateContextsOffset = cpu_to_le32(
1487
				sizeof(struct smb2_create_req) +
1488
				iov[num - 1].iov_len);
1489 1490
	le32_add_cpu(&req->CreateContextsLength,
		     server->vals->create_lease_size);
1491 1492 1493 1494
	*num_iovec = num + 1;
	return 0;
}

1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512
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);
1513
	generate_random_uuid(buf->dcontext.CreateGuid);
1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556
	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;
}

1557
static int
1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569
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 =
1570
			cpu_to_le32(sizeof(struct smb2_create_req) +
1571 1572 1573 1574 1575 1576 1577 1578
								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,
1579
		    struct cifs_open_parms *oparms)
1580 1581 1582 1583
{
	struct smb2_create_req *req = iov[0].iov_base;
	unsigned int num = *num_iovec;

1584 1585 1586 1587 1588 1589 1590 1591 1592
	/* 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 =
1593
			cpu_to_le32(sizeof(struct smb2_create_req) +
1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615
								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);
	}

1616 1617 1618 1619 1620 1621
	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();
1622 1623 1624 1625 1626
	if (iov[num].iov_base == NULL)
		return -ENOMEM;
	iov[num].iov_len = sizeof(struct create_durable);
	if (!req->CreateContextsOffset)
		req->CreateContextsOffset =
1627
			cpu_to_le32(sizeof(struct smb2_create_req) +
1628
								iov[1].iov_len);
1629
	le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
1630 1631 1632 1633
	*num_iovec = num + 1;
	return 0;
}

1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 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
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;
}

1679
int
1680
SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
1681 1682
	  __u8 *oplock, struct smb2_file_all_info *buf,
	  struct smb2_err_rsp **err_buf)
1683 1684 1685 1686
{
	struct smb2_create_req *req;
	struct smb2_create_rsp *rsp;
	struct TCP_Server_Info *server;
1687
	struct cifs_tcon *tcon = oparms->tcon;
1688
	struct cifs_ses *ses = tcon->ses;
1689
	struct kvec iov[4];
1690
	struct kvec rsp_iov = {NULL, 0};
1691 1692
	int resp_buftype;
	int uni_path_len;
P
Pavel Shilovsky 已提交
1693 1694
	__le16 *copy_path = NULL;
	int copy_size;
1695
	int rc = 0;
1696
	unsigned int n_iov = 2;
1697
	__u32 file_attributes = 0;
1698
	char *dhc_buf = NULL, *lc_buf = NULL;
1699
	int flags = 0;
1700
	unsigned int total_len;
1701

1702
	cifs_dbg(FYI, "create/open\n");
1703 1704 1705 1706 1707 1708

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

1709 1710
	rc = smb2_plain_req_init(SMB2_CREATE, tcon, (void **) &req, &total_len);

1711 1712 1713
	if (rc)
		return rc;

1714 1715 1716
	if (encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

1717
	if (oparms->create_options & CREATE_OPTION_READONLY)
1718
		file_attributes |= ATTR_READONLY;
1719 1720
	if (oparms->create_options & CREATE_OPTION_SPECIAL)
		file_attributes |= ATTR_SYSTEM;
1721

1722
	req->ImpersonationLevel = IL_IMPERSONATION;
1723
	req->DesiredAccess = cpu_to_le32(oparms->desired_access);
1724 1725 1726
	/* File attributes ignored on open (used in create though) */
	req->FileAttributes = cpu_to_le32(file_attributes);
	req->ShareAccess = FILE_SHARE_ALL_LE;
1727 1728
	req->CreateDisposition = cpu_to_le32(oparms->disposition);
	req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
1729 1730

	iov[0].iov_base = (char *)req;
1731
	/* -1 since last byte is buf[0] which is sent below (path) */
1732
	iov[0].iov_len = total_len - 1;
1733

1734
	req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746

	/* [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;

1747
		req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
1748 1749 1750 1751 1752 1753
		rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
						 &name_len,
						 tcon->treeName, path);
		if (rc)
			return rc;
		req->NameLength = cpu_to_le16(name_len * 2);
1754 1755
		uni_path_len = copy_size;
		path = copy_path;
1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769
	} 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);
			if (!copy_path)
				return -ENOMEM;
			memcpy((char *)copy_path, (const char *)path,
			       uni_path_len);
			uni_path_len = copy_size;
			path = copy_path;
		}
1770 1771
	}

1772 1773 1774
	iov[1].iov_len = uni_path_len;
	iov[1].iov_base = path;

P
Pavel Shilovsky 已提交
1775 1776 1777
	if (!server->oplocks)
		*oplock = SMB2_OPLOCK_LEVEL_NONE;

1778
	if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
P
Pavel Shilovsky 已提交
1779 1780 1781
	    *oplock == SMB2_OPLOCK_LEVEL_NONE)
		req->RequestedOplockLevel = *oplock;
	else {
1782
		rc = add_lease_context(server, iov, &n_iov, oplock);
1783
		if (rc) {
P
Pavel Shilovsky 已提交
1784 1785
			cifs_small_buf_release(req);
			kfree(copy_path);
1786
			return rc;
P
Pavel Shilovsky 已提交
1787
		}
1788
		lc_buf = iov[n_iov-1].iov_base;
P
Pavel Shilovsky 已提交
1789 1790
	}

1791 1792
	if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
		/* need to set Next field of lease context if we request it */
1793
		if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
1794
			struct create_context *ccontext =
1795
			    (struct create_context *)iov[n_iov-1].iov_base;
1796
			ccontext->Next =
1797
				cpu_to_le32(server->vals->create_lease_size);
1798
		}
1799

1800
		rc = add_durable_context(iov, &n_iov, oparms,
1801
					tcon->use_persistent);
1802 1803 1804
		if (rc) {
			cifs_small_buf_release(req);
			kfree(copy_path);
1805
			kfree(lc_buf);
1806 1807
			return rc;
		}
1808
		dhc_buf = iov[n_iov-1].iov_base;
1809 1810
	}

1811 1812
	rc = smb2_send_recv(xid, ses, iov, n_iov, &resp_buftype, flags,
			    &rsp_iov);
1813 1814
	cifs_small_buf_release(req);
	rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
1815 1816 1817

	if (rc != 0) {
		cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
1818
		if (err_buf && rsp)
1819 1820
			*err_buf = kmemdup(rsp, get_rfc1002_length(rsp) + 4,
					   GFP_KERNEL);
1821 1822 1823
		goto creat_exit;
	}

1824 1825
	oparms->fid->persistent_fid = rsp->PersistentFileId;
	oparms->fid->volatile_fid = rsp->VolatileFileId;
1826 1827 1828 1829 1830 1831 1832 1833 1834

	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
1835

P
Pavel Shilovsky 已提交
1836
	if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
1837
		*oplock = parse_lease_state(server, rsp, &oparms->fid->epoch);
P
Pavel Shilovsky 已提交
1838 1839
	else
		*oplock = rsp->OplockLevel;
1840
creat_exit:
P
Pavel Shilovsky 已提交
1841
	kfree(copy_path);
1842 1843
	kfree(lc_buf);
	kfree(dhc_buf);
1844 1845 1846 1847
	free_rsp_buf(resp_buftype, rsp);
	return rc;
}

1848 1849 1850 1851 1852
/*
 *	SMB2 IOCTL is used for both IOCTLs and FSCTLs
 */
int
SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1853 1854 1855
	   u64 volatile_fid, u32 opcode, bool is_fsctl, bool use_ipc,
	   char *in_data, u32 indatalen,
	   char **out_data, u32 *plen /* returned data len */)
1856 1857 1858
{
	struct smb2_ioctl_req *req;
	struct smb2_ioctl_rsp *rsp;
1859
	struct smb2_sync_hdr *shdr;
1860
	struct cifs_ses *ses;
1861
	struct kvec iov[2];
1862
	struct kvec rsp_iov;
1863
	int resp_buftype;
1864
	int n_iov;
1865
	int rc = 0;
1866
	int flags = 0;
1867
	unsigned int total_len;
1868 1869 1870

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

1871 1872 1873
	if (out_data != NULL)
		*out_data = NULL;

1874 1875 1876 1877
	/* zero out returned data len, in case of error */
	if (plen)
		*plen = 0;

1878 1879 1880 1881 1882
	if (tcon)
		ses = tcon->ses;
	else
		return -EIO;

1883
	if (!ses || !(ses->server))
1884 1885
		return -EIO;

1886
	rc = smb2_plain_req_init(SMB2_IOCTL, tcon, (void **) &req, &total_len);
1887 1888 1889
	if (rc)
		return rc;

1890 1891 1892 1893 1894 1895 1896
	if (use_ipc) {
		if (ses->ipc_tid == 0) {
			cifs_small_buf_release(req);
			return -ENOTCONN;
		}

		cifs_dbg(FYI, "replacing tid 0x%x with IPC tid 0x%x\n",
1897 1898
			 req->sync_hdr.TreeId, ses->ipc_tid);
		req->sync_hdr.TreeId = ses->ipc_tid;
1899
	}
1900 1901 1902
	if (encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

1903 1904 1905 1906 1907 1908 1909 1910
	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 =
1911
		       cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer));
1912 1913
		iov[1].iov_base = in_data;
		iov[1].iov_len = indatalen;
1914
		n_iov = 2;
1915
	} else
1916
		n_iov = 1;
1917 1918 1919 1920 1921 1922 1923 1924 1925

	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
1926 1927 1928 1929
	 * 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
1930
	 */
1931
	req->MaxOutputResponse = cpu_to_le32(CIFSMaxBufSize);
1932 1933 1934 1935 1936 1937 1938 1939

	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
1940 1941 1942 1943 1944 1945
	/*
	 * 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
1946
	 * input data (in iovec[1]).
S
Steve French 已提交
1947 1948 1949
	 */

	if (indatalen) {
1950
		iov[0].iov_len = total_len - 1;
S
Steve French 已提交
1951
	} else
1952
		iov[0].iov_len = total_len;
S
Steve French 已提交
1953

1954 1955
	/* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
	if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
1956
		req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1957

1958 1959
	rc = smb2_send_recv(xid, ses, iov, n_iov, &resp_buftype, flags,
			    &rsp_iov);
1960 1961
	cifs_small_buf_release(req);
	rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
1962

1963
	if ((rc != 0) && (rc != -EINVAL)) {
1964
		cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1965
		goto ioctl_exit;
1966 1967 1968
	} else if (rc == -EINVAL) {
		if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
		    (opcode != FSCTL_SRV_COPYCHUNK)) {
1969
			cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1970 1971
			goto ioctl_exit;
		}
1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003
	}

	/* 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;
	}

2004 2005
	shdr = get_sync_hdr(rsp);
	memcpy(*out_data, (char *)shdr + le32_to_cpu(rsp->OutputOffset), *plen);
2006 2007 2008 2009 2010
ioctl_exit:
	free_rsp_buf(resp_buftype, rsp);
	return rc;
}

2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023
/*
 *   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 =
2024
			cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
2025 2026 2027

	rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
			FSCTL_SET_COMPRESSION, true /* is_fsctl */,
2028
			false /* use_ipc */,
2029 2030 2031 2032 2033 2034 2035 2036
			(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;
}

2037 2038 2039 2040 2041 2042 2043 2044
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];
2045
	struct kvec rsp_iov;
2046 2047
	int resp_buftype;
	int rc = 0;
2048
	int flags = 0;
2049
	unsigned int total_len;
2050

2051
	cifs_dbg(FYI, "Close\n");
2052

2053
	if (!ses || !(ses->server))
2054 2055
		return -EIO;

2056
	rc = smb2_plain_req_init(SMB2_CLOSE, tcon, (void **) &req, &total_len);
2057 2058 2059
	if (rc)
		return rc;

2060 2061 2062
	if (encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

2063 2064 2065 2066
	req->PersistentFileId = persistent_fid;
	req->VolatileFileId = volatile_fid;

	iov[0].iov_base = (char *)req;
2067
	iov[0].iov_len = total_len;
2068

2069
	rc = smb2_send_recv(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
2070 2071
	cifs_small_buf_release(req);
	rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
2072 2073

	if (rc != 0) {
2074
		cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
2075 2076 2077 2078 2079 2080 2081 2082 2083
		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
2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096

static int
validate_buf(unsigned int offset, unsigned int buffer_length,
	     struct smb2_hdr *hdr, unsigned int min_buf_size)

{
	unsigned int smb_len = be32_to_cpu(hdr->smb2_buf_length);
	char *end_of_smb = smb_len + 4 /* RFC1001 length field */ + (char *)hdr;
	char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
	char *end_of_buf = begin_of_buf + buffer_length;


	if (buffer_length < min_buf_size) {
2097 2098
		cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
			 buffer_length, min_buf_size);
P
Pavel Shilovsky 已提交
2099 2100 2101 2102 2103
		return -EINVAL;
	}

	/* check if beyond RFC1001 maximum length */
	if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
2104 2105
		cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
			 buffer_length, smb_len);
P
Pavel Shilovsky 已提交
2106 2107 2108 2109
		return -EINVAL;
	}

	if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
2110
		cifs_dbg(VFS, "illegal server response, bad offset to data\n");
P
Pavel Shilovsky 已提交
2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141
		return -EINVAL;
	}

	return 0;
}

/*
 * If SMB buffer fields are valid, copy into temporary buffer to hold result.
 * Caller must free buffer.
 */
static int
validate_and_copy_buf(unsigned int offset, unsigned int buffer_length,
		      struct smb2_hdr *hdr, unsigned int minbufsize,
		      char *data)

{
	char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
	int rc;

	if (!data)
		return -EINVAL;

	rc = validate_buf(offset, buffer_length, hdr, minbufsize);
	if (rc)
		return rc;

	memcpy(data, begin_of_buf, buffer_length);

	return 0;
}

2142 2143
static int
query_info(const unsigned int xid, struct cifs_tcon *tcon,
2144 2145 2146
	   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
2147 2148 2149 2150
{
	struct smb2_query_info_req *req;
	struct smb2_query_info_rsp *rsp = NULL;
	struct kvec iov[2];
2151
	struct kvec rsp_iov;
P
Pavel Shilovsky 已提交
2152 2153 2154
	int rc = 0;
	int resp_buftype;
	struct cifs_ses *ses = tcon->ses;
2155
	int flags = 0;
2156
	unsigned int total_len;
P
Pavel Shilovsky 已提交
2157

2158
	cifs_dbg(FYI, "Query Info\n");
P
Pavel Shilovsky 已提交
2159

2160
	if (!ses || !(ses->server))
P
Pavel Shilovsky 已提交
2161 2162
		return -EIO;

2163 2164
	rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req,
			     &total_len);
P
Pavel Shilovsky 已提交
2165 2166 2167
	if (rc)
		return rc;

2168 2169 2170
	if (encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

2171
	req->InfoType = info_type;
2172
	req->FileInfoClass = info_class;
P
Pavel Shilovsky 已提交
2173 2174
	req->PersistentFileId = persistent_fid;
	req->VolatileFileId = volatile_fid;
2175
	req->AdditionalInformation = cpu_to_le32(additional_info);
2176 2177 2178 2179 2180 2181

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

2182
	req->OutputBufferLength = cpu_to_le32(output_len);
P
Pavel Shilovsky 已提交
2183 2184

	iov[0].iov_base = (char *)req;
2185 2186
	/* 1 for Buffer */
	iov[0].iov_len = total_len - 1;
P
Pavel Shilovsky 已提交
2187

2188
	rc = smb2_send_recv(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
2189 2190
	cifs_small_buf_release(req);
	rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
2191

P
Pavel Shilovsky 已提交
2192 2193 2194 2195 2196
	if (rc) {
		cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
		goto qinf_exit;
	}

2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210
	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;
			}
		}
	}

P
Pavel Shilovsky 已提交
2211 2212
	rc = validate_and_copy_buf(le16_to_cpu(rsp->OutputBufferOffset),
				   le32_to_cpu(rsp->OutputBufferLength),
2213
				   &rsp->hdr, min_len, *data);
P
Pavel Shilovsky 已提交
2214 2215 2216 2217 2218

qinf_exit:
	free_rsp_buf(resp_buftype, rsp);
	return rc;
}
2219

2220
int SMB2_query_eas(const unsigned int xid, struct cifs_tcon *tcon,
2221 2222
		   u64 persistent_fid, u64 volatile_fid,
		   int ea_buf_size, struct smb2_file_full_ea_info *data)
2223 2224 2225
{
	return query_info(xid, tcon, persistent_fid, volatile_fid,
			  FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE, 0,
2226
			  ea_buf_size,
2227 2228 2229 2230 2231
			  sizeof(struct smb2_file_full_ea_info),
			  (void **)&data,
			  NULL);
}

2232 2233 2234 2235 2236 2237 2238 2239 2240 2241
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);
}

2242
int
2243
SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
2244
		u64 persistent_fid, u64 volatile_fid,
2245
		void **data, u32 *plen)
2246
{
2247 2248 2249
	__u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO;
	*plen = 0;

2250
	return query_info(xid, tcon, persistent_fid, volatile_fid,
2251 2252 2253
			  0, SMB2_O_INFO_SECURITY, additional_info,
			  SMB2_MAX_BUFFER_SIZE,
			  sizeof(struct smb2_file_all_info), data, plen);
2254 2255 2256 2257 2258 2259 2260
}

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,
2261 2262
			  FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
			  sizeof(struct smb2_file_internal_info),
2263
			  sizeof(struct smb2_file_internal_info),
2264
			  (void **)&uniqueid, NULL);
2265 2266
}

2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277
/*
 * 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;
2278
	struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
2279 2280 2281
	unsigned int credits_received = 1;

	if (mid->mid_state == MID_RESPONSE_RECEIVED)
2282
		credits_received = le16_to_cpu(rsp->hdr.sync_hdr.CreditRequest);
2283 2284 2285 2286 2287

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

2288 2289 2290 2291 2292 2293 2294 2295
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;
2296 2297 2298
	int rc;
	int resched = false;

2299 2300 2301 2302 2303 2304 2305 2306 2307 2308

	/* 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) {
2309
			if (tcon->need_reconnect || tcon->need_reopen_files) {
2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325
				tcon->tc_count++;
				list_add_tail(&tcon->rlist, &tmp_list);
				tcon_exist = true;
			}
		}
	}
	/*
	 * 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) {
2326 2327
		rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon);
		if (!rc)
2328
			cifs_reopen_persistent_handles(tcon);
2329 2330
		else
			resched = true;
2331 2332 2333 2334 2335
		list_del_init(&tcon->rlist);
		cifs_put_tcon(tcon);
	}

	cifs_dbg(FYI, "Reconnecting tcons finished\n");
2336 2337
	if (resched)
		queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
2338 2339 2340 2341 2342 2343 2344
	mutex_unlock(&server->reconnect_mutex);

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

2345 2346 2347 2348 2349
int
SMB2_echo(struct TCP_Server_Info *server)
{
	struct smb2_echo_req *req;
	int rc = 0;
2350 2351 2352
	struct kvec iov[2];
	struct smb_rqst rqst = { .rq_iov = iov,
				 .rq_nvec = 2 };
2353 2354
	unsigned int total_len;
	__be32 rfc1002_marker;
2355

2356
	cifs_dbg(FYI, "In echo request\n");
2357

2358
	if (server->tcpStatus == CifsNeedNegotiate) {
2359 2360 2361
		/* No need to send echo on newly established connections */
		queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
		return rc;
2362 2363
	}

2364
	rc = smb2_plain_req_init(SMB2_ECHO, NULL, (void **)&req, &total_len);
2365 2366 2367
	if (rc)
		return rc;

2368
	req->sync_hdr.CreditRequest = cpu_to_le16(1);
2369

2370
	iov[0].iov_len = 4;
2371 2372 2373 2374
	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;
2375

P
Pavel Shilovsky 已提交
2376 2377
	rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
			     server, CIFS_ECHO_OP);
2378
	if (rc)
2379
		cifs_dbg(FYI, "Echo request failed: %d\n", rc);
2380 2381 2382 2383

	cifs_small_buf_release(req);
	return rc;
}
2384 2385 2386 2387 2388 2389 2390 2391

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];
2392
	struct kvec rsp_iov;
2393 2394
	int resp_buftype;
	int rc = 0;
2395
	int flags = 0;
2396
	unsigned int total_len;
2397

2398
	cifs_dbg(FYI, "Flush\n");
2399

2400
	if (!ses || !(ses->server))
2401 2402
		return -EIO;

2403
	rc = smb2_plain_req_init(SMB2_FLUSH, tcon, (void **) &req, &total_len);
2404 2405 2406
	if (rc)
		return rc;

2407 2408 2409
	if (encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

2410 2411 2412 2413
	req->PersistentFileId = persistent_fid;
	req->VolatileFileId = volatile_fid;

	iov[0].iov_base = (char *)req;
2414
	iov[0].iov_len = total_len;
2415

2416
	rc = smb2_send_recv(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
2417
	cifs_small_buf_release(req);
2418

2419
	if (rc != 0)
2420 2421
		cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);

2422
	free_rsp_buf(resp_buftype, rsp_iov.iov_base);
2423 2424
	return rc;
}
2425 2426 2427 2428 2429 2430

/*
 * 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
2431 2432 2433
smb2_new_read_req(void **buf, unsigned int *total_len,
		  struct cifs_io_parms *io_parms, unsigned int remaining_bytes,
		  int request_type)
2434 2435
{
	int rc = -EACCES;
2436
	struct smb2_read_plain_req *req = NULL;
2437
	struct smb2_sync_hdr *shdr;
2438

2439 2440
	rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, (void **) &req,
				 total_len);
2441 2442 2443 2444 2445
	if (rc)
		return rc;
	if (io_parms->tcon->ses->server == NULL)
		return -ECONNABORTED;

2446
	shdr = &req->sync_hdr;
2447
	shdr->ProcessId = cpu_to_le32(io_parms->pid);
2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459

	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);

	if (request_type & CHAINED_REQUEST) {
		if (!(request_type & END_OF_CHAIN)) {
2460 2461 2462
			/* next 8-byte aligned request */
			*total_len = DIV_ROUND_UP(*total_len, 8) * 8;
			shdr->NextCommand = cpu_to_le32(*total_len);
2463
		} else /* END_OF_CHAIN */
2464
			shdr->NextCommand = 0;
2465
		if (request_type & RELATED_REQUEST) {
2466
			shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
2467 2468 2469 2470
			/*
			 * Related requests use info from previous read request
			 * in chain.
			 */
2471 2472
			shdr->SessionId = 0xFFFFFFFF;
			shdr->TreeId = 0xFFFFFFFF;
2473 2474 2475 2476 2477 2478 2479 2480 2481
			req->PersistentFileId = 0xFFFFFFFF;
			req->VolatileFileId = 0xFFFFFFFF;
		}
	}
	if (remaining_bytes > io_parms->length)
		req->RemainingBytes = cpu_to_le32(remaining_bytes);
	else
		req->RemainingBytes = 0;

2482
	*buf = req;
2483 2484 2485 2486 2487 2488 2489 2490 2491
	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;
2492 2493
	struct smb2_sync_hdr *shdr =
				(struct smb2_sync_hdr *)rdata->iov[1].iov_base;
2494
	unsigned int credits_received = 1;
2495 2496
	struct smb_rqst rqst = { .rq_iov = rdata->iov,
				 .rq_nvec = 2,
2497 2498 2499 2500
				 .rq_pages = rdata->pages,
				 .rq_npages = rdata->nr_pages,
				 .rq_pagesz = rdata->pagesz,
				 .rq_tailsz = rdata->tailsz };
2501

2502 2503 2504
	cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
		 __func__, mid->mid, mid->mid_state, rdata->result,
		 rdata->bytes);
2505 2506 2507

	switch (mid->mid_state) {
	case MID_RESPONSE_RECEIVED:
2508
		credits_received = le16_to_cpu(shdr->CreditRequest);
2509
		/* result already set, check signature */
2510
		if (server->sign && !mid->decrypted) {
P
Pavel Shilovsky 已提交
2511 2512
			int rc;

2513
			rc = smb2_verify_signature(&rqst, server);
P
Pavel Shilovsky 已提交
2514
			if (rc)
2515 2516
				cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
					 rc);
P
Pavel Shilovsky 已提交
2517
		}
2518
		/* FIXME: should this be counted toward the initiating task? */
2519 2520
		task_io_account_read(rdata->got_bytes);
		cifs_stats_bytes_read(tcon, rdata->got_bytes);
2521 2522 2523 2524
		break;
	case MID_REQUEST_SUBMITTED:
	case MID_RETRY_NEEDED:
		rdata->result = -EAGAIN;
2525 2526 2527 2528 2529 2530
		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);
2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544
		break;
	default:
		if (rdata->result != -ENODATA)
			rdata->result = -EIO;
	}

	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);
}

2545
/* smb2_async_readv - send an async read, and set up mid to handle result */
2546 2547 2548
int
smb2_async_readv(struct cifs_readdata *rdata)
{
2549
	int rc, flags = 0;
2550 2551
	char *buf;
	struct smb2_sync_hdr *shdr;
2552
	struct cifs_io_parms io_parms;
2553 2554
	struct smb_rqst rqst = { .rq_iov = rdata->iov,
				 .rq_nvec = 2 };
2555
	struct TCP_Server_Info *server;
2556
	unsigned int total_len;
2557
	__be32 req_len;
2558

2559 2560
	cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
		 __func__, rdata->offset, rdata->bytes);
2561 2562 2563 2564 2565 2566 2567

	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;
2568 2569 2570

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

2571
	rc = smb2_new_read_req((void **) &buf, &total_len, &io_parms, 0, 0);
2572 2573 2574 2575 2576 2577 2578 2579 2580
	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);
		}
2581
		return rc;
2582
	}
2583

2584 2585 2586
	if (encryption_required(io_parms.tcon))
		flags |= CIFS_TRANSFORM_REQ;

2587 2588 2589 2590 2591 2592 2593 2594
	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;
2595

2596
	if (rdata->credits) {
2597
		shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
2598
						SMB2_MAX_BUFFER_SIZE));
2599
		shdr->CreditRequest = shdr->CreditCharge;
2600 2601
		spin_lock(&server->req_lock);
		server->credits += rdata->credits -
2602
						le16_to_cpu(shdr->CreditCharge);
2603 2604
		spin_unlock(&server->req_lock);
		wake_up(&server->request_q);
2605
		flags |= CIFS_HAS_CREDITS;
2606 2607
	}

2608
	kref_get(&rdata->refcount);
2609
	rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
2610
			     cifs_readv_receive, smb2_readv_callback,
2611
			     smb3_handle_read_data, rdata, flags);
2612
	if (rc) {
2613
		kref_put(&rdata->refcount, cifs_readdata_release);
2614 2615
		cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
	}
2616 2617 2618 2619

	cifs_small_buf_release(buf);
	return rc;
}
2620

2621 2622 2623 2624 2625
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;
2626
	struct smb2_read_plain_req *req = NULL;
2627
	struct smb2_read_rsp *rsp = NULL;
2628
	struct smb2_sync_hdr *shdr;
2629
	struct kvec iov[1];
2630
	struct kvec rsp_iov;
2631
	unsigned int total_len;
2632 2633
	int flags = CIFS_LOG_ERROR;
	struct cifs_ses *ses = io_parms->tcon->ses;
2634 2635

	*nbytes = 0;
2636
	rc = smb2_new_read_req((void **)&req, &total_len, io_parms, 0, 0);
2637 2638 2639
	if (rc)
		return rc;

2640 2641 2642
	if (encryption_required(io_parms->tcon))
		flags |= CIFS_TRANSFORM_REQ;

2643 2644
	iov[0].iov_base = (char *)req;
	iov[0].iov_len = total_len;
2645

2646
	rc = smb2_send_recv(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
2647
	cifs_small_buf_release(req);
2648

2649
	rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
2650

2651 2652 2653 2654 2655
	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);
		}
2656
		free_rsp_buf(resp_buftype, rsp_iov.iov_base);
2657
		return rc == -ENODATA ? 0 : rc;
2658 2659
	}

2660 2661 2662 2663 2664 2665 2666
	*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;
2667 2668
	}

2669 2670
	shdr = get_sync_hdr(rsp);

2671
	if (*buf) {
2672
		memcpy(*buf, (char *)shdr + rsp->DataOffset, *nbytes);
2673
		free_rsp_buf(resp_buftype, rsp_iov.iov_base);
2674
	} else if (resp_buftype != CIFS_NO_BUFFER) {
2675
		*buf = rsp_iov.iov_base;
2676 2677 2678 2679 2680 2681 2682 2683
		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;
}

2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697 2698
/*
 * 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:
2699
		credits_received = le16_to_cpu(rsp->hdr.sync_hdr.CreditRequest);
2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737
		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;
	}

	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
2738 2739
smb2_async_writev(struct cifs_writedata *wdata,
		  void (*release)(struct kref *kref))
2740
{
2741
	int rc = -EACCES, flags = 0;
2742
	struct smb2_write_req *req = NULL;
2743
	struct smb2_sync_hdr *shdr;
2744
	struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
2745
	struct TCP_Server_Info *server = tcon->ses->server;
2746 2747
	struct kvec iov[2];
	struct smb_rqst rqst = { };
2748 2749
	unsigned int total_len;
	__be32 rfc1002_marker;
2750

2751
	rc = smb2_plain_req_init(SMB2_WRITE, tcon, (void **) &req, &total_len);
2752 2753 2754 2755 2756 2757 2758 2759 2760
	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);
		}
2761
		goto async_writev_out;
2762
	}
2763

2764 2765 2766
	if (encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

2767
	shdr = (struct smb2_sync_hdr *)req;
2768
	shdr->ProcessId = cpu_to_le32(wdata->cfile->pid);
2769 2770 2771 2772 2773 2774 2775 2776

	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(
2777
				offsetof(struct smb2_write_req, Buffer));
2778 2779 2780
	req->RemainingBytes = 0;

	/* 4 for rfc1002 length field and 1 for Buffer */
2781
	iov[0].iov_len = 4;
2782 2783 2784 2785
	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;
2786

2787 2788
	rqst.rq_iov = iov;
	rqst.rq_nvec = 2;
2789 2790 2791 2792
	rqst.rq_pages = wdata->pages;
	rqst.rq_npages = wdata->nr_pages;
	rqst.rq_pagesz = wdata->pagesz;
	rqst.rq_tailsz = wdata->tailsz;
2793

2794 2795
	cifs_dbg(FYI, "async write at %llu %u bytes\n",
		 wdata->offset, wdata->bytes);
2796 2797 2798

	req->Length = cpu_to_le32(wdata->bytes);

2799
	if (wdata->credits) {
2800
		shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
2801
						    SMB2_MAX_BUFFER_SIZE));
2802
		shdr->CreditRequest = shdr->CreditCharge;
2803 2804
		spin_lock(&server->req_lock);
		server->credits += wdata->credits -
2805
						le16_to_cpu(shdr->CreditCharge);
2806 2807
		spin_unlock(&server->req_lock);
		wake_up(&server->request_q);
2808
		flags |= CIFS_HAS_CREDITS;
2809 2810
	}

2811
	kref_get(&wdata->refcount);
P
Pavel Shilovsky 已提交
2812 2813
	rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
			     wdata, flags);
2814

2815
	if (rc) {
2816
		kref_put(&wdata->refcount, release);
2817 2818
		cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
	}
2819 2820 2821 2822 2823

async_writev_out:
	cifs_small_buf_release(req);
	return rc;
}
2824 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838

/*
 * 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;
2839
	struct kvec rsp_iov;
2840
	int flags = 0;
2841
	unsigned int total_len;
2842

2843 2844 2845 2846 2847
	*nbytes = 0;

	if (n_vec < 1)
		return rc;

2848 2849
	rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, (void **) &req,
			     &total_len);
2850 2851 2852 2853 2854 2855
	if (rc)
		return rc;

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

2856 2857 2858
	if (encryption_required(io_parms->tcon))
		flags |= CIFS_TRANSFORM_REQ;

2859
	req->sync_hdr.ProcessId = cpu_to_le32(io_parms->pid);
2860 2861 2862 2863 2864 2865 2866 2867 2868

	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(
2869
				offsetof(struct smb2_write_req, Buffer));
2870 2871 2872
	req->RemainingBytes = 0;

	iov[0].iov_base = (char *)req;
2873 2874
	/* 1 for Buffer */
	iov[0].iov_len = total_len - 1;
2875

2876 2877
	rc = smb2_send_recv(xid, io_parms->tcon->ses, iov, n_vec + 1,
			    &resp_buftype, flags, &rsp_iov);
2878 2879
	cifs_small_buf_release(req);
	rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
2880 2881 2882

	if (rc) {
		cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
2883
		cifs_dbg(VFS, "Send error in write = %d\n", rc);
2884
	} else
2885
		*nbytes = le32_to_cpu(rsp->DataLength);
2886 2887

	free_rsp_buf(resp_buftype, rsp);
2888 2889
	return rc;
}
2890

2891 2892 2893 2894 2895 2896 2897 2898 2899 2900 2901 2902 2903 2904 2905 2906 2907 2908
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) {
2909
			cifs_dbg(VFS, "malformed search entry would overflow\n");
2910 2911 2912 2913 2914
			break;
		}

		len = le32_to_cpu(entryptr->FileNameLength);
		if ((char *)entryptr + len + size > end_of_buf) {
2915 2916
			cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
				 end_of_buf);
2917 2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941
			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];
2942
	struct kvec rsp_iov;
2943 2944
	int rc = 0;
	int len;
2945
	int resp_buftype = CIFS_NO_BUFFER;
2946 2947 2948 2949 2950 2951 2952
	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;
2953
	int flags = 0;
2954
	unsigned int total_len;
2955 2956 2957 2958 2959 2960

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

2961 2962
	rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req,
			     &total_len);
2963 2964 2965
	if (rc)
		return rc;

2966 2967 2968
	if (encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

2969 2970 2971 2972 2973 2974 2975 2976 2977 2978
	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:
2979 2980
		cifs_dbg(VFS, "info level %u isn't supported\n",
			 srch_inf->info_level);
2981 2982 2983 2984 2985 2986 2987 2988 2989 2990 2991 2992 2993
		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 =
2994
		cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1);
2995 2996 2997 2998 2999 3000 3001 3002 3003 3004
	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;
3005 3006
	/* 1 for Buffer */
	iov[0].iov_len = total_len - 1;
3007 3008 3009 3010

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

3011
	rc = smb2_send_recv(xid, ses, iov, 2, &resp_buftype, flags, &rsp_iov);
3012 3013
	cifs_small_buf_release(req);
	rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
3014

3015
	if (rc) {
3016 3017
		if (rc == -ENODATA &&
		    rsp->hdr.sync_hdr.Status == STATUS_NO_MORE_FILES) {
3018 3019 3020
			srch_inf->endOfSearch = true;
			rc = 0;
		}
3021 3022 3023 3024 3025 3026 3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047
		cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
		goto qdir_exit;
	}

	rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
			  le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
			  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;
3048 3049 3050
	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);
3051 3052 3053 3054 3055
	if (resp_buftype == CIFS_LARGE_BUFFER)
		srch_inf->smallBuf = false;
	else if (resp_buftype == CIFS_SMALL_BUFFER)
		srch_inf->smallBuf = true;
	else
3056
		cifs_dbg(VFS, "illegal search buffer type\n");
3057 3058 3059 3060 3061 3062 3063 3064

	return rc;

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

3065 3066
static int
send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
3067 3068 3069
	       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)
3070 3071 3072 3073
{
	struct smb2_set_info_req *req;
	struct smb2_set_info_rsp *rsp = NULL;
	struct kvec *iov;
3074
	struct kvec rsp_iov;
3075 3076 3077 3078
	int rc = 0;
	int resp_buftype;
	unsigned int i;
	struct cifs_ses *ses = tcon->ses;
3079
	int flags = 0;
3080
	unsigned int total_len;
3081

3082
	if (!ses || !(ses->server))
3083 3084 3085 3086 3087 3088 3089 3090 3091
		return -EIO;

	if (!num)
		return -EINVAL;

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

3092
	rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, (void **) &req, &total_len);
3093 3094 3095 3096 3097
	if (rc) {
		kfree(iov);
		return rc;
	}

3098 3099 3100
	if (encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

3101
	req->sync_hdr.ProcessId = cpu_to_le32(pid);
3102

3103
	req->InfoType = info_type;
3104 3105 3106
	req->FileInfoClass = info_class;
	req->PersistentFileId = persistent_fid;
	req->VolatileFileId = volatile_fid;
3107
	req->AdditionalInformation = cpu_to_le32(additional_info);
3108 3109

	req->BufferOffset =
3110
			cpu_to_le16(sizeof(struct smb2_set_info_req) - 1);
3111 3112 3113
	req->BufferLength = cpu_to_le32(*size);

	memcpy(req->Buffer, *data, *size);
3114
	total_len += *size;
3115 3116

	iov[0].iov_base = (char *)req;
3117 3118
	/* 1 for Buffer */
	iov[0].iov_len = total_len - 1;
3119 3120 3121 3122 3123 3124 3125

	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];
	}

3126 3127
	rc = smb2_send_recv(xid, ses, iov, num, &resp_buftype, flags,
			    &rsp_iov);
3128 3129
	cifs_small_buf_release(req);
	rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
3130

3131
	if (rc != 0)
3132
		cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
3133

3134 3135 3136 3137 3138 3139 3140 3141 3142 3143 3144 3145 3146 3147 3148 3149 3150 3151 3152 3153 3154 3155 3156 3157 3158 3159 3160 3161 3162 3163 3164
	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,
3165 3166
		current->tgid, FILE_RENAME_INFORMATION, SMB2_O_INFO_FILE,
		0, 2, data, size);
3167 3168 3169
	kfree(data);
	return rc;
}
3170

3171 3172 3173 3174 3175 3176 3177 3178 3179 3180 3181 3182
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,
3183 3184
		current->tgid, FILE_DISPOSITION_INFORMATION, SMB2_O_INFO_FILE,
		0, 1, &data, &size);
3185 3186
}

3187 3188 3189 3190 3191 3192 3193 3194 3195 3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212
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,
3213 3214
			current->tgid, FILE_LINK_INFORMATION, SMB2_O_INFO_FILE,
			0, 2, data, size);
3215 3216 3217
	kfree(data);
	return rc;
}
3218 3219 3220

int
SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3221
	     u64 volatile_fid, u32 pid, __le64 *eof, bool is_falloc)
3222 3223 3224 3225 3226 3227 3228 3229 3230 3231
{
	struct smb2_file_eof_info info;
	void *data;
	unsigned int size;

	info.EndOfFile = *eof;

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

3232 3233
	if (is_falloc)
		return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3234 3235
			pid, FILE_ALLOCATION_INFORMATION, SMB2_O_INFO_FILE,
			0, 1, &data, &size);
3236 3237
	else
		return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3238 3239
			pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
			0, 1, &data, &size);
3240
}
3241 3242 3243 3244 3245 3246 3247 3248

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,
3249 3250 3251 3252 3253 3254 3255 3256 3257 3258 3259 3260
		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);
3261
}
3262

3263 3264 3265 3266 3267 3268 3269 3270 3271 3272
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);
}

3273 3274 3275 3276 3277 3278
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;
3279 3280
	struct smb2_oplock_break_req *req = NULL;
	struct cifs_ses *ses = tcon->ses;
3281
	int flags = CIFS_OBREAK_OP;
3282 3283 3284 3285
	unsigned int total_len;
	struct kvec iov[1];
	struct kvec rsp_iov;
	int resp_buf_type;
3286

3287
	cifs_dbg(FYI, "SMB2_oplock_break\n");
3288 3289
	rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req,
			     &total_len);
3290 3291 3292
	if (rc)
		return rc;

3293 3294 3295
	if (encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

3296 3297 3298
	req->VolatileFid = volatile_fid;
	req->PersistentFid = persistent_fid;
	req->OplockLevel = oplock_level;
3299
	req->sync_hdr.CreditRequest = cpu_to_le16(1);
3300

3301 3302 3303 3304 3305 3306
	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);
3307
	cifs_small_buf_release(req);
3308 3309 3310

	if (rc) {
		cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
3311
		cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
3312 3313 3314 3315
	}

	return rc;
}
3316 3317 3318 3319 3320 3321 3322 3323

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);
3324 3325
	kst->f_bfree  = kst->f_bavail =
			le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
3326 3327 3328 3329 3330 3331 3332 3333 3334
	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)
{
	int rc;
	struct smb2_query_info_req *req;
3335
	unsigned int total_len;
3336

3337
	cifs_dbg(FYI, "Query FSInfo level %d\n", level);
3338 3339 3340 3341

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

3342 3343
	rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req,
			     &total_len);
3344 3345 3346 3347 3348 3349 3350
	if (rc)
		return rc;

	req->InfoType = SMB2_O_INFO_FILESYSTEM;
	req->FileInfoClass = level;
	req->PersistentFileId = persistent_fid;
	req->VolatileFileId = volatile_fid;
3351
	/* 1 for pad */
3352
	req->InputBufferOffset =
3353
			cpu_to_le16(sizeof(struct smb2_query_info_req) - 1);
3354 3355 3356 3357
	req->OutputBufferLength = cpu_to_le32(
		outbuf_len + sizeof(struct smb2_query_info_rsp) - 1 - 4);

	iov->iov_base = (char *)req;
3358
	iov->iov_len = total_len;
3359 3360 3361 3362 3363 3364 3365 3366 3367
	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;
3368
	struct kvec rsp_iov;
3369 3370 3371 3372
	int rc = 0;
	int resp_buftype;
	struct cifs_ses *ses = tcon->ses;
	struct smb2_fs_full_size_info *info = NULL;
3373
	int flags = 0;
3374 3375 3376 3377 3378 3379 3380

	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;

3381 3382 3383
	if (encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

3384
	rc = smb2_send_recv(xid, ses, &iov, 1, &resp_buftype, flags, &rsp_iov);
3385
	cifs_small_buf_release(iov.iov_base);
3386 3387
	if (rc) {
		cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3388
		goto qfsinf_exit;
3389
	}
3390
	rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3391 3392 3393 3394 3395 3396 3397 3398 3399

	info = (struct smb2_fs_full_size_info *)(4 /* RFC1001 len */ +
		le16_to_cpu(rsp->OutputBufferOffset) + (char *)&rsp->hdr);
	rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
			  le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
			  sizeof(struct smb2_fs_full_size_info));
	if (!rc)
		copy_fs_info_to_kstatfs(info, fsdata);

3400
qfsinf_exit:
3401
	free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3402 3403 3404 3405 3406
	return rc;
}

int
SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
3407
	      u64 persistent_fid, u64 volatile_fid, int level)
3408 3409 3410
{
	struct smb2_query_info_rsp *rsp = NULL;
	struct kvec iov;
3411
	struct kvec rsp_iov;
3412
	int rc = 0;
3413
	int resp_buftype, max_len, min_len;
3414 3415
	struct cifs_ses *ses = tcon->ses;
	unsigned int rsp_len, offset;
3416
	int flags = 0;
3417

3418 3419 3420 3421 3422 3423
	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
3424 3425 3426
	} else if (level == FS_SECTOR_SIZE_INFORMATION) {
		max_len = sizeof(struct smb3_fs_ss_info);
		min_len = sizeof(struct smb3_fs_ss_info);
3427
	} else {
S
Steven French 已提交
3428
		cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
3429 3430 3431 3432
		return -EINVAL;
	}

	rc = build_qfs_info_req(&iov, tcon, level, max_len,
3433 3434 3435 3436
				persistent_fid, volatile_fid);
	if (rc)
		return rc;

3437 3438 3439
	if (encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

3440
	rc = smb2_send_recv(xid, ses, &iov, 1, &resp_buftype, flags, &rsp_iov);
3441
	cifs_small_buf_release(iov.iov_base);
3442 3443 3444 3445
	if (rc) {
		cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
		goto qfsattr_exit;
	}
3446
	rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3447 3448 3449

	rsp_len = le32_to_cpu(rsp->OutputBufferLength);
	offset = le16_to_cpu(rsp->OutputBufferOffset);
3450 3451 3452 3453 3454
	rc = validate_buf(offset, rsp_len, &rsp->hdr, min_len);
	if (rc)
		goto qfsattr_exit;

	if (level == FS_ATTRIBUTE_INFORMATION)
3455 3456
		memcpy(&tcon->fsAttrInfo, 4 /* RFC1001 len */ + offset
			+ (char *)&rsp->hdr, min_t(unsigned int,
3457 3458 3459 3460
			rsp_len, max_len));
	else if (level == FS_DEVICE_INFORMATION)
		memcpy(&tcon->fsDevInfo, 4 /* RFC1001 len */ + offset
			+ (char *)&rsp->hdr, sizeof(FILE_SYSTEM_DEVICE_INFO));
S
Steven French 已提交
3461 3462 3463 3464 3465 3466 3467
	else if (level == FS_SECTOR_SIZE_INFORMATION) {
		struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
			(4 /* RFC1001 len */ + offset + (char *)&rsp->hdr);
		tcon->ss_flags = le32_to_cpu(ss_info->Flags);
		tcon->perf_sector_size =
			le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
	}
3468 3469

qfsattr_exit:
3470
	free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3471 3472
	return rc;
}
3473 3474 3475 3476 3477 3478 3479 3480 3481

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];
3482
	struct kvec rsp_iov;
3483 3484
	int resp_buf_type;
	unsigned int count;
3485
	int flags = CIFS_NO_RESP;
3486
	unsigned int total_len;
3487

3488
	cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
3489

3490
	rc = smb2_plain_req_init(SMB2_LOCK, tcon, (void **) &req, &total_len);
3491 3492 3493
	if (rc)
		return rc;

3494 3495 3496
	if (encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

3497
	req->sync_hdr.ProcessId = cpu_to_le32(pid);
3498 3499 3500 3501 3502 3503 3504 3505
	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;
3506
	iov[0].iov_len = total_len - sizeof(struct smb2_lock_element);
3507 3508 3509 3510
	iov[1].iov_base = (char *)buf;
	iov[1].iov_len = count;

	cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
3511 3512
	rc = smb2_send_recv(xid, tcon->ses, iov, 2, &resp_buf_type, flags,
			    &rsp_iov);
3513
	cifs_small_buf_release(req);
3514
	if (rc) {
3515
		cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
3516 3517 3518 3519 3520 3521 3522 3523 3524 3525 3526 3527 3528 3529 3530 3531 3532 3533 3534 3535 3536 3537
		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);
}
3538 3539 3540 3541 3542 3543 3544

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;
3545
	struct cifs_ses *ses = tcon->ses;
3546
	int flags = CIFS_OBREAK_OP;
3547 3548 3549 3550
	unsigned int total_len;
	struct kvec iov[1];
	struct kvec rsp_iov;
	int resp_buf_type;
3551

3552
	cifs_dbg(FYI, "SMB2_lease_break\n");
3553 3554
	rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req,
			     &total_len);
3555 3556 3557
	if (rc)
		return rc;

3558 3559 3560
	if (encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

3561
	req->sync_hdr.CreditRequest = cpu_to_le16(1);
3562
	req->StructureSize = cpu_to_le16(36);
3563
	total_len += 12;
3564 3565 3566 3567

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

3568 3569 3570 3571 3572 3573
	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);
3574
	cifs_small_buf_release(req);
3575 3576 3577

	if (rc) {
		cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
3578
		cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
3579 3580 3581 3582
	}

	return rc;
}