smb2pdu.c 97.3 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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/* init request without RFC1001 length at the beginning */
static int
smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
		    void **request_buf, unsigned int *total_len)
{
	int rc;
	struct smb2_sync_hdr *shdr;

	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;
	}

	shdr = (struct smb2_sync_hdr *)(*request_buf);

	fill_small_buf(smb2_command, tcon, shdr, total_len);

	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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/*
 * 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. The returned buffer
 * has RFC1001 length at the beginning.
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 */
static int
small_smb2_init(__le16 smb2_command, struct cifs_tcon *tcon,
		void **request_buf)
{
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	int rc;
	unsigned int total_len;
	struct smb2_pdu *pdu;
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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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	pdu = (struct smb2_pdu *)(*request_buf);

	fill_small_buf(smb2_command, tcon, get_sync_hdr(pdu), &total_len);

	/* Note this is only network field converted to big endian */
	pdu->hdr.smb2_buf_length = cpu_to_be32(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)
432
{
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	char *pneg_ctxt = (char *)req + OFFSET_OF_NEG_CONTEXT;
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	build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
	/* Add 2 to size to round to 8 byte boundary */
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	pneg_ctxt += 2 + sizeof(struct smb2_preauth_neg_context);
	build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
	req->NegotiateContextOffset = cpu_to_le32(OFFSET_OF_NEG_CONTEXT);
	req->NegotiateContextCount = cpu_to_le16(2);
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	*total_len += 4 + sizeof(struct smb2_preauth_neg_context)
		+ sizeof(struct smb2_encryption_neg_context);
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}
#else
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static void assemble_neg_contexts(struct smb2_negotiate_req *req,
				  unsigned int *total_len)
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{
	return;
}
#endif /* SMB311 */

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

int
SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
{
	struct smb2_negotiate_req *req;
	struct smb2_negotiate_rsp *rsp;
	struct kvec iov[1];
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	struct kvec rsp_iov;
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	int rc = 0;
	int resp_buftype;
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	struct TCP_Server_Info *server = ses->server;
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	int blob_offset, blob_length;
	char *security_blob;
	int flags = CIFS_NEG_OP;
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	unsigned int total_len;
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484
	cifs_dbg(FYI, "Negotiate protocol\n");
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	if (!server) {
		WARN(1, "%s: server is NULL!\n", __func__);
		return -EIO;
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	}

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

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	req->sync_hdr.SessionId = 0;
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	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);
520
	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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	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);
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	else {
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		memcpy(req->ClientGUID, server->client_guid,
			SMB2_CLIENT_GUID_SIZE);
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		if (ses->server->vals->protocol_id == SMB311_PROT_ID)
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			assemble_neg_contexts(req, &total_len);
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	}
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	iov[0].iov_base = (char *)req;
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	iov[0].iov_len = total_len;
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	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 "
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			"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;
	}

583
	cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
584

585
	if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
586
		cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
587
	else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
588
		cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
589
	else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
590
		cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
S
Steve French 已提交
591 592
	else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
		cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
593 594 595 596
#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 */
597
	else {
598
		cifs_dbg(VFS, "Illegal dialect returned by server 0x%x\n",
599
			 le16_to_cpu(rsp->DialectRevision));
600 601 602 603 604
		rc = -EIO;
		goto neg_exit;
	}
	server->dialect = le16_to_cpu(rsp->DialectRevision);

605 606
	/* BB: add check that dialect was valid given dialect(s) we asked for */

607 608
	/* SMB2 only has an extended negflavor */
	server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
609 610 611
	/* 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);
612 613 614 615 616
	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);
617 618
	/* Internal types */
	server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
619 620 621

	security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
					       &rsp->hdr);
622 623 624 625 626 627 628
	/*
	 * 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.
	 */
629
	if (blob_length == 0) {
630
		cifs_dbg(FYI, "missing security blob on negprot\n");
631 632
		server->sec_ntlmssp = true;
	}
P
Pavel Shilovsky 已提交
633

634
	rc = cifs_enable_signing(server, ses->sign);
635 636
	if (rc)
		goto neg_exit;
637
	if (blob_length) {
638
		rc = decode_negTokenInit(security_blob, blob_length, server);
639 640 641 642
		if (rc == 1)
			rc = 0;
		else if (rc == 0)
			rc = -EIO;
643 644 645 646 647
	}
neg_exit:
	free_rsp_buf(resp_buftype, rsp);
	return rc;
}
648

649 650 651 652
int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
{
	int rc = 0;
	struct validate_negotiate_info_req vneg_inbuf;
653
	struct validate_negotiate_info_rsp *pneg_rsp = NULL;
654
	u32 rsplen;
655
	u32 inbuflen; /* max of 4 dialects */
656 657 658 659 660

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

	/*
	 * validation ioctl must be signed, so no point sending this if we
661 662
	 * can not sign it (ie are not known user).  Even if signing is not
	 * required (enabled but not negotiated), in those cases we selectively
663
	 * sign just this, the first and only signed request on a connection.
664
	 * Having validation of negotiate info  helps reduce attack vectors.
665
	 */
666
	if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
667 668
		return 0; /* validation requires signing */

669 670 671 672 673 674 675 676
	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");

677 678
	vneg_inbuf.Capabilities =
			cpu_to_le32(tcon->ses->server->vals->req_capabilities);
679 680
	memcpy(vneg_inbuf.Guid, tcon->ses->server->client_guid,
					SMB2_CLIENT_GUID_SIZE);
681 682 683 684 685 686 687 688 689 690

	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;

691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714

	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;
	}
715 716 717

	rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
		FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
718
		false /* use_ipc */,
719 720 721 722 723 724 725 726 727
		(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)) {
728 729 730 731
		cifs_dbg(VFS, "invalid protocol negotiate response size: %d\n",
			 rsplen);

		/* relax check since Mac returns max bufsize allowed on ioctl */
732 733
		if ((rsplen > CIFSMaxBufSize)
		     || (rsplen < sizeof(struct validate_negotiate_info_rsp)))
734
			goto err_rsp_free;
735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752
	}

	/* 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");
753
	kfree(pneg_rsp);
754 755 756 757
	return 0;

vneg_out:
	cifs_dbg(VFS, "protocol revalidation - security settings mismatch\n");
758 759
err_rsp_free:
	kfree(pneg_rsp);
760 761 762
	return -EIO;
}

S
Sachin Prabhu 已提交
763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784
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;
	}
}

785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810
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;
811
	unsigned int total_len;
812

813 814
	rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, (void **) &req,
			     &total_len);
815 816 817
	if (rc)
		return rc;

818
	/* First session, not a reauthenticate */
819
	req->sync_hdr.SessionId = 0;
820 821 822 823 824 825

	/* 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 */
826
	req->sync_hdr.CreditRequest = cpu_to_le16(3);
827 828 829 830 831 832 833 834 835 836 837 838 839

	/* 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;
840 841
	/* 1 for pad */
	sess_data->iov[0].iov_len = total_len - 1;
842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862
	/*
	 * 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;
863
	struct kvec rsp_iov = { NULL, 0 };
864 865 866

	/* Testing shows that buffer offset must be at location of Buffer[0] */
	req->SecurityBufferOffset =
867
		cpu_to_le16(sizeof(struct smb2_sess_setup_req) - 1 /* pad */);
868 869 870 871
	req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);

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

872 873 874 875
	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);
876 877
	cifs_small_buf_release(sess_data->iov[0].iov_base);
	memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
878 879 880 881 882 883 884 885 886 887 888

	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);
889
	if (ses->server->ops->generate_signingkey) {
890 891 892 893 894
		rc = ses->server->ops->generate_signingkey(ses);
		if (rc) {
			cifs_dbg(FYI,
				"SMB3 session key generation failed\n");
			mutex_unlock(&ses->server->srv_mutex);
895
			return rc;
896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964
		}
	}
	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;
965
	ses->Suid = rsp->hdr.sync_hdr.SessionId;
966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987

	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

988 989 990 991 992
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)
993
{
994 995
	int rc;
	struct cifs_ses *ses = sess_data->ses;
996
	struct smb2_sess_setup_rsp *rsp = NULL;
997
	char *ntlmssp_blob = NULL;
998
	bool use_spnego = false; /* else use raw ntlmssp */
999
	u16 blob_length = 0;
1000

1001 1002 1003 1004 1005
	/*
	 * If memory allocation is successful, caller of this function
	 * frees it.
	 */
	ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1006 1007 1008 1009
	if (!ses->ntlmssp) {
		rc = -ENOMEM;
		goto out_err;
	}
1010
	ses->ntlmssp->sesskey_per_smbsess = true;
1011

1012
	rc = SMB2_sess_alloc_buffer(sess_data);
1013
	if (rc)
1014
		goto out_err;
1015

1016 1017 1018 1019 1020 1021
	ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
			       GFP_KERNEL);
	if (ntlmssp_blob == NULL) {
		rc = -ENOMEM;
		goto out;
	}
1022

1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034
	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;
1035

1036 1037
	rc = SMB2_sess_sendreceive(sess_data);
	rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1038

1039 1040
	/* If true, rc here is expected and not an error */
	if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1041
		rsp->hdr.sync_hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
1042
		rc = 0;
1043

1044 1045
	if (rc)
		goto out;
1046

1047 1048 1049 1050
	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));
1051
		rc = -EIO;
1052
		goto out;
1053
	}
1054 1055 1056 1057
	rc = decode_ntlmssp_challenge(rsp->Buffer,
			le16_to_cpu(rsp->SecurityBufferLength), ses);
	if (rc)
		goto out;
1058

1059
	cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1060 1061


1062
	ses->Suid = rsp->hdr.sync_hdr.SessionId;
1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078
	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;
}
1079

1080 1081 1082 1083 1084 1085 1086 1087 1088 1089
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;
1090

1091 1092 1093
	rc = SMB2_sess_alloc_buffer(sess_data);
	if (rc)
		goto out;
1094

1095
	req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
1096
	req->sync_hdr.SessionId = ses->Suid;
1097 1098 1099 1100 1101 1102

	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;
1103 1104
	}

1105 1106 1107 1108 1109 1110 1111 1112
	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;
1113

1114 1115 1116 1117 1118 1119
	rc = SMB2_sess_sendreceive(sess_data);
	if (rc)
		goto out;

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

1120
	ses->Suid = rsp->hdr.sync_hdr.SessionId;
1121 1122
	ses->session_flags = le16_to_cpu(rsp->SessionFlags);

1123 1124 1125 1126 1127 1128 1129 1130 1131
	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;
}
1132

1133 1134 1135
static int
SMB2_select_sec(struct cifs_ses *ses, struct SMB2_sess_data *sess_data)
{
S
Sachin Prabhu 已提交
1136 1137 1138 1139 1140 1141 1142 1143 1144
	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;
	}
1145

S
Sachin Prabhu 已提交
1146
	switch (type) {
1147 1148 1149 1150 1151 1152 1153
	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
1154
		cifs_dbg(VFS, "secType %d not supported!\n", type);
1155
		return -EOPNOTSUPP;
1156 1157
	}

1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173
	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;
1174 1175
	}

1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190
	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);

1191 1192
	if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign))
		cifs_dbg(VFS, "signing requested but authenticated as guest\n");
1193
	rc = sess_data->result;
1194
out:
1195
	kfree(sess_data);
1196 1197 1198 1199 1200 1201 1202 1203 1204
	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;
1205
	int flags = 0;
1206 1207 1208 1209
	unsigned int total_len;
	struct kvec iov[1];
	struct kvec rsp_iov;
	int resp_buf_type;
1210

1211
	cifs_dbg(FYI, "disconnect session %p\n", ses);
1212 1213 1214 1215 1216 1217

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

1218 1219 1220 1221
	/* no need to send SMB logoff if uid already closed due to reconnect */
	if (ses->need_reconnect)
		goto smb2_session_already_dead;

1222
	rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, (void **) &req, &total_len);
1223 1224 1225 1226
	if (rc)
		return rc;

	 /* since no tcon, smb2_init can not do this, so do here */
1227
	req->sync_hdr.SessionId = ses->Suid;
1228 1229 1230 1231

	if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
		flags |= CIFS_TRANSFORM_REQ;
	else if (server->sign)
1232 1233 1234 1235 1236 1237
		req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;

	flags |= CIFS_NO_RESP;

	iov[0].iov_base = (char *)req;
	iov[0].iov_len = total_len;
1238

1239
	rc = smb2_send_recv(xid, ses, iov, 1, &resp_buf_type, flags, &rsp_iov);
1240
	cifs_small_buf_release(req);
1241 1242 1243 1244
	/*
	 * No tcon so can't do
	 * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
	 */
1245 1246

smb2_session_already_dead:
1247 1248
	return rc;
}
1249 1250 1251

static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
{
1252
	cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
1253 1254 1255 1256
}

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

S
Steve French 已提交
1257 1258 1259 1260 1261 1262 1263 1264
/* 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;
}

1265 1266 1267 1268 1269 1270 1271
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];
1272
	struct kvec rsp_iov = { NULL, 0 };
1273 1274 1275 1276
	int rc = 0;
	int resp_buftype;
	int unc_path_len;
	__le16 *unc_path = NULL;
1277
	int flags = 0;
1278
	unsigned int total_len;
1279

1280
	cifs_dbg(FYI, "TCON\n");
1281

1282
	if (!(ses->server) || !tree)
1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295
		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;
	}

1296 1297 1298 1299
	/* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
	if (tcon)
		tcon->tid = 0;

1300 1301
	rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, (void **) &req,
			     &total_len);
1302 1303 1304 1305 1306 1307
	if (rc) {
		kfree(unc_path);
		return rc;
	}

	if (tcon == NULL) {
1308 1309 1310
		if ((ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA))
			flags |= CIFS_TRANSFORM_REQ;

1311
		/* since no tcon, smb2_init can not do this, so do here */
1312
		req->sync_hdr.SessionId = ses->Suid;
1313
		if (ses->server->sign)
1314
			req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1315 1316
	} else if (encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;
1317 1318

	iov[0].iov_base = (char *)req;
1319 1320
	/* 1 for pad */
	iov[0].iov_len = total_len - 1;
1321 1322 1323

	/* Testing shows that buffer offset must be at location of Buffer[0] */
	req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
1324
			- 1 /* pad */);
1325 1326 1327 1328
	req->PathLength = cpu_to_le16(unc_path_len - 2);
	iov[1].iov_base = unc_path;
	iov[1].iov_len = unc_path_len;

1329
	rc = smb2_send_recv(xid, ses, iov, 2, &resp_buftype, flags, &rsp_iov);
1330 1331
	cifs_small_buf_release(req);
	rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
1332 1333 1334 1335 1336 1337 1338 1339 1340 1341

	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) {
1342
		ses->ipc_tid = rsp->hdr.sync_hdr.TreeId;
1343 1344 1345
		goto tcon_exit;
	}

1346 1347
	switch (rsp->ShareType) {
	case SMB2_SHARE_TYPE_DISK:
1348
		cifs_dbg(FYI, "connection to disk share\n");
1349 1350
		break;
	case SMB2_SHARE_TYPE_PIPE:
1351
		tcon->ipc = true;
1352
		cifs_dbg(FYI, "connection to pipe share\n");
1353 1354 1355
		break;
	case SMB2_SHARE_TYPE_PRINT:
		tcon->ipc = true;
1356
		cifs_dbg(FYI, "connection to printer\n");
1357 1358
		break;
	default:
1359
		cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
1360 1361 1362 1363 1364
		rc = -EOPNOTSUPP;
		goto tcon_error_exit;
	}

	tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
1365
	tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
1366 1367 1368
	tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
	tcon->tidStatus = CifsGood;
	tcon->need_reconnect = false;
1369
	tcon->tid = rsp->hdr.sync_hdr.TreeId;
1370
	strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
1371 1372 1373

	if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
	    ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
1374
		cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
1375 1376 1377 1378 1379

	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
1380
	init_copy_chunk_defaults(tcon);
1381 1382
	if (tcon->ses->server->ops->validate_negotiate)
		rc = tcon->ses->server->ops->validate_negotiate(xid, tcon);
1383 1384 1385 1386 1387 1388
tcon_exit:
	free_rsp_buf(resp_buftype, rsp);
	kfree(unc_path);
	return rc;

tcon_error_exit:
1389
	if (rsp && rsp->hdr.sync_hdr.Status == STATUS_BAD_NETWORK_NAME) {
1390
		cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1391 1392 1393 1394 1395 1396 1397 1398 1399 1400
	}
	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;
1401
	int flags = 0;
1402 1403 1404 1405
	unsigned int total_len;
	struct kvec iov[1];
	struct kvec rsp_iov;
	int resp_buf_type;
1406

1407
	cifs_dbg(FYI, "Tree Disconnect\n");
1408

1409
	if (!ses || !(ses->server))
1410 1411 1412 1413 1414
		return -EIO;

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

1415 1416
	rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req,
			     &total_len);
1417 1418 1419
	if (rc)
		return rc;

1420 1421 1422
	if (encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

1423 1424 1425 1426 1427 1428
	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);
1429
	cifs_small_buf_release(req);
1430 1431 1432 1433 1434
	if (rc)
		cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);

	return rc;
}
1435

P
Pavel Shilovsky 已提交
1436

1437 1438 1439 1440 1441 1442 1443 1444 1445 1446
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
1447
					(struct create_durable, Data));
1448 1449 1450 1451
	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);
1452
	/* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
1453 1454 1455 1456 1457 1458 1459
	buf->Name[0] = 'D';
	buf->Name[1] = 'H';
	buf->Name[2] = 'n';
	buf->Name[3] = 'Q';
	return buf;
}

1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476
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;
1477
	/* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
1478 1479 1480 1481 1482 1483 1484
	buf->Name[0] = 'D';
	buf->Name[1] = 'H';
	buf->Name[2] = 'n';
	buf->Name[3] = 'C';
	return buf;
}

P
Pavel Shilovsky 已提交
1485
static __u8
1486 1487
parse_lease_state(struct TCP_Server_Info *server, struct smb2_create_rsp *rsp,
		  unsigned int *epoch)
P
Pavel Shilovsky 已提交
1488 1489
{
	char *data_offset;
1490
	struct create_context *cc;
1491 1492
	unsigned int next;
	unsigned int remaining;
1493
	char *name;
P
Pavel Shilovsky 已提交
1494

1495
	data_offset = (char *)rsp + 4 + le32_to_cpu(rsp->CreateContextsOffset);
1496
	remaining = le32_to_cpu(rsp->CreateContextsLength);
1497
	cc = (struct create_context *)data_offset;
1498
	while (remaining >= sizeof(struct create_context)) {
1499
		name = le16_to_cpu(cc->NameOffset) + (char *)cc;
1500 1501 1502 1503 1504 1505 1506 1507 1508 1509
		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
1510

1511
	return 0;
P
Pavel Shilovsky 已提交
1512 1513
}

1514
static int
1515 1516
add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
		  unsigned int *num_iovec, __u8 *oplock)
1517 1518 1519 1520
{
	struct smb2_create_req *req = iov[0].iov_base;
	unsigned int num = *num_iovec;

1521
	iov[num].iov_base = server->ops->create_lease_buf(oplock+1, *oplock);
1522 1523
	if (iov[num].iov_base == NULL)
		return -ENOMEM;
1524
	iov[num].iov_len = server->vals->create_lease_size;
1525 1526 1527
	req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
	if (!req->CreateContextsOffset)
		req->CreateContextsOffset = cpu_to_le32(
1528
				sizeof(struct smb2_create_req) +
1529
				iov[num - 1].iov_len);
1530 1531
	le32_add_cpu(&req->CreateContextsLength,
		     server->vals->create_lease_size);
1532 1533 1534 1535
	*num_iovec = num + 1;
	return 0;
}

1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553
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);
1554
	generate_random_uuid(buf->dcontext.CreateGuid);
1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597
	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;
}

1598
static int
1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610
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 =
1611
			cpu_to_le32(sizeof(struct smb2_create_req) +
1612 1613 1614 1615 1616 1617 1618 1619
								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,
1620
		    struct cifs_open_parms *oparms)
1621 1622 1623 1624
{
	struct smb2_create_req *req = iov[0].iov_base;
	unsigned int num = *num_iovec;

1625 1626 1627 1628 1629 1630 1631 1632 1633
	/* 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 =
1634
			cpu_to_le32(sizeof(struct smb2_create_req) +
1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656
								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);
	}

1657 1658 1659 1660 1661 1662
	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();
1663 1664 1665 1666 1667
	if (iov[num].iov_base == NULL)
		return -ENOMEM;
	iov[num].iov_len = sizeof(struct create_durable);
	if (!req->CreateContextsOffset)
		req->CreateContextsOffset =
1668
			cpu_to_le32(sizeof(struct smb2_create_req) +
1669
								iov[1].iov_len);
1670
	le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
1671 1672 1673 1674
	*num_iovec = num + 1;
	return 0;
}

1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719
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;
}

1720
int
1721
SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
1722 1723
	  __u8 *oplock, struct smb2_file_all_info *buf,
	  struct smb2_err_rsp **err_buf)
1724 1725 1726 1727
{
	struct smb2_create_req *req;
	struct smb2_create_rsp *rsp;
	struct TCP_Server_Info *server;
1728
	struct cifs_tcon *tcon = oparms->tcon;
1729
	struct cifs_ses *ses = tcon->ses;
1730
	struct kvec iov[4];
1731
	struct kvec rsp_iov = {NULL, 0};
1732 1733
	int resp_buftype;
	int uni_path_len;
P
Pavel Shilovsky 已提交
1734 1735
	__le16 *copy_path = NULL;
	int copy_size;
1736
	int rc = 0;
1737
	unsigned int n_iov = 2;
1738
	__u32 file_attributes = 0;
1739
	char *dhc_buf = NULL, *lc_buf = NULL;
1740
	int flags = 0;
1741
	unsigned int total_len;
1742

1743
	cifs_dbg(FYI, "create/open\n");
1744 1745 1746 1747 1748 1749

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

1750 1751
	rc = smb2_plain_req_init(SMB2_CREATE, tcon, (void **) &req, &total_len);

1752 1753 1754
	if (rc)
		return rc;

1755 1756 1757
	if (encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

1758
	if (oparms->create_options & CREATE_OPTION_READONLY)
1759
		file_attributes |= ATTR_READONLY;
1760 1761
	if (oparms->create_options & CREATE_OPTION_SPECIAL)
		file_attributes |= ATTR_SYSTEM;
1762

1763
	req->ImpersonationLevel = IL_IMPERSONATION;
1764
	req->DesiredAccess = cpu_to_le32(oparms->desired_access);
1765 1766 1767
	/* File attributes ignored on open (used in create though) */
	req->FileAttributes = cpu_to_le32(file_attributes);
	req->ShareAccess = FILE_SHARE_ALL_LE;
1768 1769
	req->CreateDisposition = cpu_to_le32(oparms->disposition);
	req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
1770 1771

	iov[0].iov_base = (char *)req;
1772
	/* -1 since last byte is buf[0] which is sent below (path) */
1773
	iov[0].iov_len = total_len - 1;
1774

1775
	req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787

	/* [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;

1788
		req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
1789 1790 1791 1792 1793 1794
		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);
1795 1796
		uni_path_len = copy_size;
		path = copy_path;
1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810
	} 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;
		}
1811 1812
	}

1813 1814 1815
	iov[1].iov_len = uni_path_len;
	iov[1].iov_base = path;

P
Pavel Shilovsky 已提交
1816 1817 1818
	if (!server->oplocks)
		*oplock = SMB2_OPLOCK_LEVEL_NONE;

1819
	if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
P
Pavel Shilovsky 已提交
1820 1821 1822
	    *oplock == SMB2_OPLOCK_LEVEL_NONE)
		req->RequestedOplockLevel = *oplock;
	else {
1823
		rc = add_lease_context(server, iov, &n_iov, oplock);
1824
		if (rc) {
P
Pavel Shilovsky 已提交
1825 1826
			cifs_small_buf_release(req);
			kfree(copy_path);
1827
			return rc;
P
Pavel Shilovsky 已提交
1828
		}
1829
		lc_buf = iov[n_iov-1].iov_base;
P
Pavel Shilovsky 已提交
1830 1831
	}

1832 1833
	if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
		/* need to set Next field of lease context if we request it */
1834
		if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
1835
			struct create_context *ccontext =
1836
			    (struct create_context *)iov[n_iov-1].iov_base;
1837
			ccontext->Next =
1838
				cpu_to_le32(server->vals->create_lease_size);
1839
		}
1840

1841
		rc = add_durable_context(iov, &n_iov, oparms,
1842
					tcon->use_persistent);
1843 1844 1845
		if (rc) {
			cifs_small_buf_release(req);
			kfree(copy_path);
1846
			kfree(lc_buf);
1847 1848
			return rc;
		}
1849
		dhc_buf = iov[n_iov-1].iov_base;
1850 1851
	}

1852 1853
	rc = smb2_send_recv(xid, ses, iov, n_iov, &resp_buftype, flags,
			    &rsp_iov);
1854 1855
	cifs_small_buf_release(req);
	rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
1856 1857 1858

	if (rc != 0) {
		cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
1859
		if (err_buf && rsp)
1860 1861
			*err_buf = kmemdup(rsp, get_rfc1002_length(rsp) + 4,
					   GFP_KERNEL);
1862 1863 1864
		goto creat_exit;
	}

1865 1866
	oparms->fid->persistent_fid = rsp->PersistentFileId;
	oparms->fid->volatile_fid = rsp->VolatileFileId;
1867 1868 1869 1870 1871 1872 1873 1874 1875

	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
1876

P
Pavel Shilovsky 已提交
1877
	if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
1878
		*oplock = parse_lease_state(server, rsp, &oparms->fid->epoch);
P
Pavel Shilovsky 已提交
1879 1880
	else
		*oplock = rsp->OplockLevel;
1881
creat_exit:
P
Pavel Shilovsky 已提交
1882
	kfree(copy_path);
1883 1884
	kfree(lc_buf);
	kfree(dhc_buf);
1885 1886 1887 1888
	free_rsp_buf(resp_buftype, rsp);
	return rc;
}

1889 1890 1891 1892 1893
/*
 *	SMB2 IOCTL is used for both IOCTLs and FSCTLs
 */
int
SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1894 1895 1896
	   u64 volatile_fid, u32 opcode, bool is_fsctl, bool use_ipc,
	   char *in_data, u32 indatalen,
	   char **out_data, u32 *plen /* returned data len */)
1897 1898 1899
{
	struct smb2_ioctl_req *req;
	struct smb2_ioctl_rsp *rsp;
1900
	struct smb2_sync_hdr *shdr;
1901
	struct cifs_ses *ses;
1902
	struct kvec iov[2];
1903
	struct kvec rsp_iov;
1904
	int resp_buftype;
1905
	int n_iov;
1906
	int rc = 0;
1907
	int flags = 0;
1908
	unsigned int total_len;
1909 1910 1911

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

1912 1913 1914
	if (out_data != NULL)
		*out_data = NULL;

1915 1916 1917 1918
	/* zero out returned data len, in case of error */
	if (plen)
		*plen = 0;

1919 1920 1921 1922 1923
	if (tcon)
		ses = tcon->ses;
	else
		return -EIO;

1924
	if (!ses || !(ses->server))
1925 1926
		return -EIO;

1927
	rc = smb2_plain_req_init(SMB2_IOCTL, tcon, (void **) &req, &total_len);
1928 1929 1930
	if (rc)
		return rc;

1931 1932 1933 1934 1935 1936 1937
	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",
1938 1939
			 req->sync_hdr.TreeId, ses->ipc_tid);
		req->sync_hdr.TreeId = ses->ipc_tid;
1940
	}
1941 1942 1943
	if (encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

1944 1945 1946 1947 1948 1949 1950 1951
	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 =
1952
		       cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer));
1953 1954
		iov[1].iov_base = in_data;
		iov[1].iov_len = indatalen;
1955
		n_iov = 2;
1956
	} else
1957
		n_iov = 1;
1958 1959 1960 1961 1962 1963 1964 1965 1966

	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
1967 1968 1969 1970
	 * 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
1971
	 */
1972
	req->MaxOutputResponse = cpu_to_le32(CIFSMaxBufSize);
1973 1974 1975 1976 1977 1978 1979 1980

	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
1981 1982 1983 1984 1985 1986
	/*
	 * 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
1987
	 * input data (in iovec[1]).
S
Steve French 已提交
1988 1989 1990
	 */

	if (indatalen) {
1991
		iov[0].iov_len = total_len - 1;
S
Steve French 已提交
1992
	} else
1993
		iov[0].iov_len = total_len;
S
Steve French 已提交
1994

1995 1996
	/* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
	if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
1997
		req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1998

1999 2000
	rc = smb2_send_recv(xid, ses, iov, n_iov, &resp_buftype, flags,
			    &rsp_iov);
2001 2002
	cifs_small_buf_release(req);
	rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
2003

2004
	if ((rc != 0) && (rc != -EINVAL)) {
2005
		cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2006
		goto ioctl_exit;
2007 2008 2009
	} else if (rc == -EINVAL) {
		if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
		    (opcode != FSCTL_SRV_COPYCHUNK)) {
2010
			cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2011 2012
			goto ioctl_exit;
		}
2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044
	}

	/* 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;
	}

2045 2046
	shdr = get_sync_hdr(rsp);
	memcpy(*out_data, (char *)shdr + le32_to_cpu(rsp->OutputOffset), *plen);
2047 2048 2049 2050 2051
ioctl_exit:
	free_rsp_buf(resp_buftype, rsp);
	return rc;
}

2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064
/*
 *   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 =
2065
			cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
2066 2067 2068

	rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
			FSCTL_SET_COMPRESSION, true /* is_fsctl */,
2069
			false /* use_ipc */,
2070 2071 2072 2073 2074 2075 2076 2077
			(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;
}

2078 2079 2080 2081 2082 2083 2084 2085
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];
2086
	struct kvec rsp_iov;
2087 2088
	int resp_buftype;
	int rc = 0;
2089
	int flags = 0;
2090
	unsigned int total_len;
2091

2092
	cifs_dbg(FYI, "Close\n");
2093

2094
	if (!ses || !(ses->server))
2095 2096
		return -EIO;

2097
	rc = smb2_plain_req_init(SMB2_CLOSE, tcon, (void **) &req, &total_len);
2098 2099 2100
	if (rc)
		return rc;

2101 2102 2103
	if (encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

2104 2105 2106 2107
	req->PersistentFileId = persistent_fid;
	req->VolatileFileId = volatile_fid;

	iov[0].iov_base = (char *)req;
2108
	iov[0].iov_len = total_len;
2109

2110
	rc = smb2_send_recv(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
2111 2112
	cifs_small_buf_release(req);
	rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
2113 2114

	if (rc != 0) {
2115
		cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
2116 2117 2118 2119 2120 2121 2122 2123 2124
		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
2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137

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) {
2138 2139
		cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
			 buffer_length, min_buf_size);
P
Pavel Shilovsky 已提交
2140 2141 2142 2143 2144
		return -EINVAL;
	}

	/* check if beyond RFC1001 maximum length */
	if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
2145 2146
		cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
			 buffer_length, smb_len);
P
Pavel Shilovsky 已提交
2147 2148 2149 2150
		return -EINVAL;
	}

	if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
2151
		cifs_dbg(VFS, "illegal server response, bad offset to data\n");
P
Pavel Shilovsky 已提交
2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182
		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;
}

2183 2184
static int
query_info(const unsigned int xid, struct cifs_tcon *tcon,
2185 2186 2187
	   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
2188 2189 2190 2191
{
	struct smb2_query_info_req *req;
	struct smb2_query_info_rsp *rsp = NULL;
	struct kvec iov[2];
2192
	struct kvec rsp_iov;
P
Pavel Shilovsky 已提交
2193 2194 2195
	int rc = 0;
	int resp_buftype;
	struct cifs_ses *ses = tcon->ses;
2196
	int flags = 0;
P
Pavel Shilovsky 已提交
2197

2198
	cifs_dbg(FYI, "Query Info\n");
P
Pavel Shilovsky 已提交
2199

2200
	if (!ses || !(ses->server))
P
Pavel Shilovsky 已提交
2201 2202 2203 2204 2205 2206
		return -EIO;

	rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
	if (rc)
		return rc;

2207 2208 2209
	if (encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

2210
	req->InfoType = info_type;
2211
	req->FileInfoClass = info_class;
P
Pavel Shilovsky 已提交
2212 2213
	req->PersistentFileId = persistent_fid;
	req->VolatileFileId = volatile_fid;
2214
	req->AdditionalInformation = cpu_to_le32(additional_info);
2215 2216 2217 2218 2219 2220 2221

	/*
	 * We do not use the input buffer (do not send extra byte)
	 */
	req->InputBufferOffset = 0;
	inc_rfc1001_len(req, -1);

2222
	req->OutputBufferLength = cpu_to_le32(output_len);
P
Pavel Shilovsky 已提交
2223 2224 2225 2226 2227

	iov[0].iov_base = (char *)req;
	/* 4 for rfc1002 length field */
	iov[0].iov_len = get_rfc1002_length(req) + 4;

2228
	rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
2229 2230
	cifs_small_buf_release(req);
	rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
2231

P
Pavel Shilovsky 已提交
2232 2233 2234 2235 2236
	if (rc) {
		cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
		goto qinf_exit;
	}

2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250
	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
2251 2252
	rc = validate_and_copy_buf(le16_to_cpu(rsp->OutputBufferOffset),
				   le32_to_cpu(rsp->OutputBufferLength),
2253
				   &rsp->hdr, min_len, *data);
P
Pavel Shilovsky 已提交
2254 2255 2256 2257 2258

qinf_exit:
	free_rsp_buf(resp_buftype, rsp);
	return rc;
}
2259

2260
int SMB2_query_eas(const unsigned int xid, struct cifs_tcon *tcon,
2261 2262
		   u64 persistent_fid, u64 volatile_fid,
		   int ea_buf_size, struct smb2_file_full_ea_info *data)
2263 2264 2265
{
	return query_info(xid, tcon, persistent_fid, volatile_fid,
			  FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE, 0,
2266
			  ea_buf_size,
2267 2268 2269 2270 2271
			  sizeof(struct smb2_file_full_ea_info),
			  (void **)&data,
			  NULL);
}

2272 2273 2274 2275 2276 2277 2278 2279 2280 2281
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);
}

2282
int
2283
SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
2284
		u64 persistent_fid, u64 volatile_fid,
2285
		void **data, u32 *plen)
2286
{
2287 2288 2289
	__u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO;
	*plen = 0;

2290
	return query_info(xid, tcon, persistent_fid, volatile_fid,
2291 2292 2293
			  0, SMB2_O_INFO_SECURITY, additional_info,
			  SMB2_MAX_BUFFER_SIZE,
			  sizeof(struct smb2_file_all_info), data, plen);
2294 2295 2296 2297 2298 2299 2300
}

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,
2301 2302
			  FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
			  sizeof(struct smb2_file_internal_info),
2303
			  sizeof(struct smb2_file_internal_info),
2304
			  (void **)&uniqueid, NULL);
2305 2306
}

2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317
/*
 * 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;
2318
	struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
2319 2320 2321
	unsigned int credits_received = 1;

	if (mid->mid_state == MID_RESPONSE_RECEIVED)
2322
		credits_received = le16_to_cpu(rsp->hdr.sync_hdr.CreditRequest);
2323 2324 2325 2326 2327

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

2328 2329 2330 2331 2332 2333 2334 2335
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;
2336 2337 2338
	int rc;
	int resched = false;

2339 2340 2341 2342 2343 2344 2345 2346 2347 2348

	/* 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) {
2349
			if (tcon->need_reconnect || tcon->need_reopen_files) {
2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365
				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) {
2366 2367
		rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon);
		if (!rc)
2368
			cifs_reopen_persistent_handles(tcon);
2369 2370
		else
			resched = true;
2371 2372 2373 2374 2375
		list_del_init(&tcon->rlist);
		cifs_put_tcon(tcon);
	}

	cifs_dbg(FYI, "Reconnecting tcons finished\n");
2376 2377
	if (resched)
		queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
2378 2379 2380 2381 2382 2383 2384
	mutex_unlock(&server->reconnect_mutex);

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

2385 2386 2387 2388 2389
int
SMB2_echo(struct TCP_Server_Info *server)
{
	struct smb2_echo_req *req;
	int rc = 0;
2390 2391 2392
	struct kvec iov[2];
	struct smb_rqst rqst = { .rq_iov = iov,
				 .rq_nvec = 2 };
2393 2394
	unsigned int total_len;
	__be32 rfc1002_marker;
2395

2396
	cifs_dbg(FYI, "In echo request\n");
2397

2398
	if (server->tcpStatus == CifsNeedNegotiate) {
2399 2400 2401
		/* No need to send echo on newly established connections */
		queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
		return rc;
2402 2403
	}

2404
	rc = smb2_plain_req_init(SMB2_ECHO, NULL, (void **)&req, &total_len);
2405 2406 2407
	if (rc)
		return rc;

2408
	req->sync_hdr.CreditRequest = cpu_to_le16(1);
2409

2410
	iov[0].iov_len = 4;
2411 2412 2413 2414
	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;
2415

P
Pavel Shilovsky 已提交
2416 2417
	rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
			     server, CIFS_ECHO_OP);
2418
	if (rc)
2419
		cifs_dbg(FYI, "Echo request failed: %d\n", rc);
2420 2421 2422 2423

	cifs_small_buf_release(req);
	return rc;
}
2424 2425 2426 2427 2428 2429 2430 2431

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];
2432
	struct kvec rsp_iov;
2433 2434
	int resp_buftype;
	int rc = 0;
2435
	int flags = 0;
2436
	unsigned int total_len;
2437

2438
	cifs_dbg(FYI, "Flush\n");
2439

2440
	if (!ses || !(ses->server))
2441 2442
		return -EIO;

2443
	rc = smb2_plain_req_init(SMB2_FLUSH, tcon, (void **) &req, &total_len);
2444 2445 2446
	if (rc)
		return rc;

2447 2448 2449
	if (encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

2450 2451 2452 2453
	req->PersistentFileId = persistent_fid;
	req->VolatileFileId = volatile_fid;

	iov[0].iov_base = (char *)req;
2454
	iov[0].iov_len = total_len;
2455

2456
	rc = smb2_send_recv(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
2457
	cifs_small_buf_release(req);
2458

2459
	if (rc != 0)
2460 2461
		cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);

2462
	free_rsp_buf(resp_buftype, rsp_iov.iov_base);
2463 2464
	return rc;
}
2465 2466 2467 2468 2469 2470

/*
 * 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
2471 2472 2473
smb2_new_read_req(void **buf, unsigned int *total_len,
		  struct cifs_io_parms *io_parms, unsigned int remaining_bytes,
		  int request_type)
2474 2475
{
	int rc = -EACCES;
2476
	struct smb2_read_plain_req *req = NULL;
2477
	struct smb2_sync_hdr *shdr;
2478

2479 2480
	rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, (void **) &req,
				 total_len);
2481 2482 2483 2484 2485
	if (rc)
		return rc;
	if (io_parms->tcon->ses->server == NULL)
		return -ECONNABORTED;

2486
	shdr = &req->sync_hdr;
2487
	shdr->ProcessId = cpu_to_le32(io_parms->pid);
2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499

	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)) {
2500 2501 2502
			/* next 8-byte aligned request */
			*total_len = DIV_ROUND_UP(*total_len, 8) * 8;
			shdr->NextCommand = cpu_to_le32(*total_len);
2503
		} else /* END_OF_CHAIN */
2504
			shdr->NextCommand = 0;
2505
		if (request_type & RELATED_REQUEST) {
2506
			shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
2507 2508 2509 2510
			/*
			 * Related requests use info from previous read request
			 * in chain.
			 */
2511 2512
			shdr->SessionId = 0xFFFFFFFF;
			shdr->TreeId = 0xFFFFFFFF;
2513 2514 2515 2516 2517 2518 2519 2520 2521
			req->PersistentFileId = 0xFFFFFFFF;
			req->VolatileFileId = 0xFFFFFFFF;
		}
	}
	if (remaining_bytes > io_parms->length)
		req->RemainingBytes = cpu_to_le32(remaining_bytes);
	else
		req->RemainingBytes = 0;

2522
	*buf = req;
2523 2524 2525 2526 2527 2528 2529 2530 2531
	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;
2532 2533
	struct smb2_sync_hdr *shdr =
				(struct smb2_sync_hdr *)rdata->iov[1].iov_base;
2534
	unsigned int credits_received = 1;
2535 2536
	struct smb_rqst rqst = { .rq_iov = rdata->iov,
				 .rq_nvec = 2,
2537 2538 2539 2540
				 .rq_pages = rdata->pages,
				 .rq_npages = rdata->nr_pages,
				 .rq_pagesz = rdata->pagesz,
				 .rq_tailsz = rdata->tailsz };
2541

2542 2543 2544
	cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
		 __func__, mid->mid, mid->mid_state, rdata->result,
		 rdata->bytes);
2545 2546 2547

	switch (mid->mid_state) {
	case MID_RESPONSE_RECEIVED:
2548
		credits_received = le16_to_cpu(shdr->CreditRequest);
2549
		/* result already set, check signature */
2550
		if (server->sign && !mid->decrypted) {
P
Pavel Shilovsky 已提交
2551 2552
			int rc;

2553
			rc = smb2_verify_signature(&rqst, server);
P
Pavel Shilovsky 已提交
2554
			if (rc)
2555 2556
				cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
					 rc);
P
Pavel Shilovsky 已提交
2557
		}
2558
		/* FIXME: should this be counted toward the initiating task? */
2559 2560
		task_io_account_read(rdata->got_bytes);
		cifs_stats_bytes_read(tcon, rdata->got_bytes);
2561 2562 2563 2564
		break;
	case MID_REQUEST_SUBMITTED:
	case MID_RETRY_NEEDED:
		rdata->result = -EAGAIN;
2565 2566 2567 2568 2569 2570
		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);
2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584
		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);
}

2585
/* smb2_async_readv - send an async read, and set up mid to handle result */
2586 2587 2588
int
smb2_async_readv(struct cifs_readdata *rdata)
{
2589
	int rc, flags = 0;
2590 2591
	char *buf;
	struct smb2_sync_hdr *shdr;
2592
	struct cifs_io_parms io_parms;
2593 2594
	struct smb_rqst rqst = { .rq_iov = rdata->iov,
				 .rq_nvec = 2 };
2595
	struct TCP_Server_Info *server;
2596
	unsigned int total_len;
2597
	__be32 req_len;
2598

2599 2600
	cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
		 __func__, rdata->offset, rdata->bytes);
2601 2602 2603 2604 2605 2606 2607

	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;
2608 2609 2610

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

2611
	rc = smb2_new_read_req((void **) &buf, &total_len, &io_parms, 0, 0);
2612 2613 2614 2615 2616 2617 2618 2619 2620
	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);
		}
2621
		return rc;
2622
	}
2623

2624 2625 2626
	if (encryption_required(io_parms.tcon))
		flags |= CIFS_TRANSFORM_REQ;

2627 2628 2629 2630 2631 2632 2633 2634
	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;
2635

2636
	if (rdata->credits) {
2637
		shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
2638
						SMB2_MAX_BUFFER_SIZE));
2639
		shdr->CreditRequest = shdr->CreditCharge;
2640 2641
		spin_lock(&server->req_lock);
		server->credits += rdata->credits -
2642
						le16_to_cpu(shdr->CreditCharge);
2643 2644
		spin_unlock(&server->req_lock);
		wake_up(&server->request_q);
2645
		flags |= CIFS_HAS_CREDITS;
2646 2647
	}

2648
	kref_get(&rdata->refcount);
2649
	rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
2650
			     cifs_readv_receive, smb2_readv_callback,
2651
			     smb3_handle_read_data, rdata, flags);
2652
	if (rc) {
2653
		kref_put(&rdata->refcount, cifs_readdata_release);
2654 2655
		cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
	}
2656 2657 2658 2659

	cifs_small_buf_release(buf);
	return rc;
}
2660

2661 2662 2663 2664 2665
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;
2666
	struct smb2_read_plain_req *req = NULL;
2667
	struct smb2_read_rsp *rsp = NULL;
2668
	struct smb2_sync_hdr *shdr;
2669
	struct kvec iov[1];
2670
	struct kvec rsp_iov;
2671
	unsigned int total_len;
2672 2673
	struct smb_rqst rqst = { .rq_iov = iov,
				 .rq_nvec = 2 };
2674 2675
	int flags = CIFS_LOG_ERROR;
	struct cifs_ses *ses = io_parms->tcon->ses;
2676 2677

	*nbytes = 0;
2678
	rc = smb2_new_read_req((void **)&req, &total_len, io_parms, 0, 0);
2679 2680 2681
	if (rc)
		return rc;

2682 2683 2684
	if (encryption_required(io_parms->tcon))
		flags |= CIFS_TRANSFORM_REQ;

2685 2686
	iov[0].iov_base = (char *)req;
	iov[0].iov_len = total_len;
2687

2688
	rc = smb2_send_recv(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
2689
	cifs_small_buf_release(req);
2690

2691
	rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
2692

2693 2694 2695 2696 2697
	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);
		}
2698
		free_rsp_buf(resp_buftype, rsp_iov.iov_base);
2699
		return rc == -ENODATA ? 0 : rc;
2700 2701
	}

2702 2703 2704 2705 2706 2707 2708
	*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;
2709 2710
	}

2711 2712
	shdr = get_sync_hdr(rsp);

2713
	if (*buf) {
2714
		memcpy(*buf, (char *)shdr + rsp->DataOffset, *nbytes);
2715
		free_rsp_buf(resp_buftype, rsp_iov.iov_base);
2716
	} else if (resp_buftype != CIFS_NO_BUFFER) {
2717
		*buf = rsp_iov.iov_base;
2718 2719 2720 2721 2722 2723 2724 2725
		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;
}

2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740
/*
 * 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:
2741
		credits_received = le16_to_cpu(rsp->hdr.sync_hdr.CreditRequest);
2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 2764 2765 2766 2767 2768 2769 2770 2771 2772 2773 2774 2775 2776 2777 2778 2779
		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
2780 2781
smb2_async_writev(struct cifs_writedata *wdata,
		  void (*release)(struct kref *kref))
2782
{
2783
	int rc = -EACCES, flags = 0;
2784
	struct smb2_write_req *req = NULL;
2785
	struct smb2_sync_hdr *shdr;
2786
	struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
2787
	struct TCP_Server_Info *server = tcon->ses->server;
2788 2789
	struct kvec iov[2];
	struct smb_rqst rqst = { };
2790 2791
	unsigned int total_len;
	__be32 rfc1002_marker;
2792

2793
	rc = smb2_plain_req_init(SMB2_WRITE, tcon, (void **) &req, &total_len);
2794 2795 2796 2797 2798 2799 2800 2801 2802
	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);
		}
2803
		goto async_writev_out;
2804
	}
2805

2806 2807 2808
	if (encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

2809
	shdr = (struct smb2_sync_hdr *)req;
2810
	shdr->ProcessId = cpu_to_le32(wdata->cfile->pid);
2811 2812 2813 2814 2815 2816 2817 2818

	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(
2819
				offsetof(struct smb2_write_req, Buffer));
2820 2821 2822
	req->RemainingBytes = 0;

	/* 4 for rfc1002 length field and 1 for Buffer */
2823
	iov[0].iov_len = 4;
2824 2825 2826 2827
	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;
2828

2829 2830
	rqst.rq_iov = iov;
	rqst.rq_nvec = 2;
2831 2832 2833 2834
	rqst.rq_pages = wdata->pages;
	rqst.rq_npages = wdata->nr_pages;
	rqst.rq_pagesz = wdata->pagesz;
	rqst.rq_tailsz = wdata->tailsz;
2835

2836 2837
	cifs_dbg(FYI, "async write at %llu %u bytes\n",
		 wdata->offset, wdata->bytes);
2838 2839 2840

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

2841
	if (wdata->credits) {
2842
		shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
2843
						    SMB2_MAX_BUFFER_SIZE));
2844
		shdr->CreditRequest = shdr->CreditCharge;
2845 2846
		spin_lock(&server->req_lock);
		server->credits += wdata->credits -
2847
						le16_to_cpu(shdr->CreditCharge);
2848 2849
		spin_unlock(&server->req_lock);
		wake_up(&server->request_q);
2850
		flags |= CIFS_HAS_CREDITS;
2851 2852
	}

2853
	kref_get(&wdata->refcount);
P
Pavel Shilovsky 已提交
2854 2855
	rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
			     wdata, flags);
2856

2857
	if (rc) {
2858
		kref_put(&wdata->refcount, release);
2859 2860
		cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
	}
2861 2862 2863 2864 2865

async_writev_out:
	cifs_small_buf_release(req);
	return rc;
}
2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880

/*
 * 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;
2881
	struct kvec rsp_iov;
2882
	int flags = 0;
2883
	unsigned int total_len;
2884

2885 2886 2887 2888 2889
	*nbytes = 0;

	if (n_vec < 1)
		return rc;

2890 2891
	rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, (void **) &req,
			     &total_len);
2892 2893 2894 2895 2896 2897
	if (rc)
		return rc;

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

2898 2899 2900
	if (encryption_required(io_parms->tcon))
		flags |= CIFS_TRANSFORM_REQ;

2901
	req->sync_hdr.ProcessId = cpu_to_le32(io_parms->pid);
2902 2903 2904 2905 2906 2907 2908 2909 2910

	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(
2911
				offsetof(struct smb2_write_req, Buffer));
2912 2913 2914
	req->RemainingBytes = 0;

	iov[0].iov_base = (char *)req;
2915 2916
	/* 1 for Buffer */
	iov[0].iov_len = total_len - 1;
2917

2918 2919
	rc = smb2_send_recv(xid, io_parms->tcon->ses, iov, n_vec + 1,
			    &resp_buftype, flags, &rsp_iov);
2920 2921
	cifs_small_buf_release(req);
	rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
2922 2923 2924

	if (rc) {
		cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
2925
		cifs_dbg(VFS, "Send error in write = %d\n", rc);
2926
	} else
2927
		*nbytes = le32_to_cpu(rsp->DataLength);
2928 2929

	free_rsp_buf(resp_buftype, rsp);
2930 2931
	return rc;
}
2932

2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950
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) {
2951
			cifs_dbg(VFS, "malformed search entry would overflow\n");
2952 2953 2954 2955 2956
			break;
		}

		len = le32_to_cpu(entryptr->FileNameLength);
		if ((char *)entryptr + len + size > end_of_buf) {
2957 2958
			cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
				 end_of_buf);
2959 2960 2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971 2972 2973 2974 2975 2976 2977 2978 2979 2980 2981 2982 2983
			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];
2984
	struct kvec rsp_iov;
2985 2986
	int rc = 0;
	int len;
2987
	int resp_buftype = CIFS_NO_BUFFER;
2988 2989 2990 2991 2992 2993 2994
	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;
2995
	int flags = 0;
2996 2997 2998 2999 3000 3001 3002 3003 3004 3005

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

	rc = small_smb2_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req);
	if (rc)
		return rc;

3006 3007 3008
	if (encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

3009 3010 3011 3012 3013 3014 3015 3016 3017 3018
	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:
3019 3020
		cifs_dbg(VFS, "info level %u isn't supported\n",
			 srch_inf->info_level);
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 3048 3049 3050 3051 3052
		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 =
		cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1 - 4);
	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;
	/* 4 for RFC1001 length and 1 for Buffer */
	iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;

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

	inc_rfc1001_len(req, len - 1 /* Buffer */);

3053
	rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, flags, &rsp_iov);
3054 3055
	cifs_small_buf_release(req);
	rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
3056

3057
	if (rc) {
3058 3059
		if (rc == -ENODATA &&
		    rsp->hdr.sync_hdr.Status == STATUS_NO_MORE_FILES) {
3060 3061 3062
			srch_inf->endOfSearch = true;
			rc = 0;
		}
3063 3064 3065 3066 3067 3068 3069 3070 3071 3072 3073 3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084 3085 3086 3087 3088 3089
		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;
3090 3091 3092
	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);
3093 3094 3095 3096 3097
	if (resp_buftype == CIFS_LARGE_BUFFER)
		srch_inf->smallBuf = false;
	else if (resp_buftype == CIFS_SMALL_BUFFER)
		srch_inf->smallBuf = true;
	else
3098
		cifs_dbg(VFS, "illegal search buffer type\n");
3099 3100 3101 3102 3103 3104 3105 3106

	return rc;

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

3107 3108
static int
send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
3109 3110 3111
	       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)
3112 3113 3114 3115
{
	struct smb2_set_info_req *req;
	struct smb2_set_info_rsp *rsp = NULL;
	struct kvec *iov;
3116
	struct kvec rsp_iov;
3117 3118 3119 3120
	int rc = 0;
	int resp_buftype;
	unsigned int i;
	struct cifs_ses *ses = tcon->ses;
3121
	int flags = 0;
3122

3123
	if (!ses || !(ses->server))
3124 3125 3126 3127 3128 3129 3130 3131 3132 3133 3134 3135 3136 3137 3138
		return -EIO;

	if (!num)
		return -EINVAL;

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

	rc = small_smb2_init(SMB2_SET_INFO, tcon, (void **) &req);
	if (rc) {
		kfree(iov);
		return rc;
	}

3139 3140 3141
	if (encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

3142
	req->hdr.sync_hdr.ProcessId = cpu_to_le32(pid);
3143

3144
	req->InfoType = info_type;
3145 3146 3147
	req->FileInfoClass = info_class;
	req->PersistentFileId = persistent_fid;
	req->VolatileFileId = volatile_fid;
3148
	req->AdditionalInformation = cpu_to_le32(additional_info);
3149 3150 3151 3152 3153 3154 3155 3156 3157 3158 3159 3160 3161 3162 3163 3164 3165 3166 3167 3168 3169

	/* 4 for RFC1001 length and 1 for Buffer */
	req->BufferOffset =
			cpu_to_le16(sizeof(struct smb2_set_info_req) - 1 - 4);
	req->BufferLength = cpu_to_le32(*size);

	inc_rfc1001_len(req, *size - 1 /* Buffer */);

	memcpy(req->Buffer, *data, *size);

	iov[0].iov_base = (char *)req;
	/* 4 for RFC1001 length */
	iov[0].iov_len = get_rfc1002_length(req) + 4;

	for (i = 1; i < num; i++) {
		inc_rfc1001_len(req, size[i]);
		le32_add_cpu(&req->BufferLength, size[i]);
		iov[i].iov_base = (char *)data[i];
		iov[i].iov_len = size[i];
	}

3170
	rc = SendReceive2(xid, ses, iov, num, &resp_buftype, flags, &rsp_iov);
3171 3172
	cifs_small_buf_release(req);
	rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
3173

3174
	if (rc != 0)
3175
		cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
3176

3177 3178 3179 3180 3181 3182 3183 3184 3185 3186 3187 3188 3189 3190 3191 3192 3193 3194 3195 3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207
	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,
3208 3209
		current->tgid, FILE_RENAME_INFORMATION, SMB2_O_INFO_FILE,
		0, 2, data, size);
3210 3211 3212
	kfree(data);
	return rc;
}
3213

3214 3215 3216 3217 3218 3219 3220 3221 3222 3223 3224 3225
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,
3226 3227
		current->tgid, FILE_DISPOSITION_INFORMATION, SMB2_O_INFO_FILE,
		0, 1, &data, &size);
3228 3229
}

3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 3242 3243 3244 3245 3246 3247 3248 3249 3250 3251 3252 3253 3254 3255
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,
3256 3257
			current->tgid, FILE_LINK_INFORMATION, SMB2_O_INFO_FILE,
			0, 2, data, size);
3258 3259 3260
	kfree(data);
	return rc;
}
3261 3262 3263

int
SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3264
	     u64 volatile_fid, u32 pid, __le64 *eof, bool is_falloc)
3265 3266 3267 3268 3269 3270 3271 3272 3273 3274
{
	struct smb2_file_eof_info info;
	void *data;
	unsigned int size;

	info.EndOfFile = *eof;

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

3275 3276
	if (is_falloc)
		return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3277 3278
			pid, FILE_ALLOCATION_INFORMATION, SMB2_O_INFO_FILE,
			0, 1, &data, &size);
3279 3280
	else
		return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3281 3282
			pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
			0, 1, &data, &size);
3283
}
3284 3285 3286 3287 3288 3289 3290 3291

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,
3292 3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303
		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);
3304
}
3305

3306 3307 3308 3309 3310 3311 3312 3313 3314 3315
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);
}

3316 3317 3318 3319 3320 3321 3322
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;
	struct smb2_oplock_break *req = NULL;
3323
	int flags = CIFS_OBREAK_OP;
3324

3325
	cifs_dbg(FYI, "SMB2_oplock_break\n");
3326 3327 3328 3329
	rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
	if (rc)
		return rc;

3330 3331 3332
	if (encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

3333 3334 3335
	req->VolatileFid = volatile_fid;
	req->PersistentFid = persistent_fid;
	req->OplockLevel = oplock_level;
3336
	req->hdr.sync_hdr.CreditRequest = cpu_to_le16(1);
3337

3338
	rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, flags);
3339
	cifs_small_buf_release(req);
3340 3341 3342

	if (rc) {
		cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
3343
		cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
3344 3345 3346 3347
	}

	return rc;
}
3348 3349 3350 3351 3352 3353 3354 3355

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);
3356 3357
	kst->f_bfree  = kst->f_bavail =
			le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
3358 3359 3360 3361 3362 3363 3364 3365 3366 3367
	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;

3368
	cifs_dbg(FYI, "Query FSInfo level %d\n", level);
3369 3370 3371 3372 3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386 3387 3388 3389 3390 3391 3392 3393 3394 3395 3396 3397 3398

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

	rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
	if (rc)
		return rc;

	req->InfoType = SMB2_O_INFO_FILESYSTEM;
	req->FileInfoClass = level;
	req->PersistentFileId = persistent_fid;
	req->VolatileFileId = volatile_fid;
	/* 4 for rfc1002 length field and 1 for pad */
	req->InputBufferOffset =
			cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
	req->OutputBufferLength = cpu_to_le32(
		outbuf_len + sizeof(struct smb2_query_info_rsp) - 1 - 4);

	iov->iov_base = (char *)req;
	/* 4 for rfc1002 length field */
	iov->iov_len = get_rfc1002_length(req) + 4;
	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;
3399
	struct kvec rsp_iov;
3400 3401 3402 3403
	int rc = 0;
	int resp_buftype;
	struct cifs_ses *ses = tcon->ses;
	struct smb2_fs_full_size_info *info = NULL;
3404
	int flags = 0;
3405 3406 3407 3408 3409 3410 3411

	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;

3412 3413 3414 3415
	if (encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

	rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, flags, &rsp_iov);
3416
	cifs_small_buf_release(iov.iov_base);
3417 3418
	if (rc) {
		cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3419
		goto qfsinf_exit;
3420
	}
3421
	rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3422 3423 3424 3425 3426 3427 3428 3429 3430

	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);

3431
qfsinf_exit:
3432
	free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3433 3434 3435 3436 3437
	return rc;
}

int
SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
3438
	      u64 persistent_fid, u64 volatile_fid, int level)
3439 3440 3441
{
	struct smb2_query_info_rsp *rsp = NULL;
	struct kvec iov;
3442
	struct kvec rsp_iov;
3443
	int rc = 0;
3444
	int resp_buftype, max_len, min_len;
3445 3446
	struct cifs_ses *ses = tcon->ses;
	unsigned int rsp_len, offset;
3447
	int flags = 0;
3448

3449 3450 3451 3452 3453 3454
	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
3455 3456 3457
	} else if (level == FS_SECTOR_SIZE_INFORMATION) {
		max_len = sizeof(struct smb3_fs_ss_info);
		min_len = sizeof(struct smb3_fs_ss_info);
3458
	} else {
S
Steven French 已提交
3459
		cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
3460 3461 3462 3463
		return -EINVAL;
	}

	rc = build_qfs_info_req(&iov, tcon, level, max_len,
3464 3465 3466 3467
				persistent_fid, volatile_fid);
	if (rc)
		return rc;

3468 3469 3470 3471
	if (encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

	rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, flags, &rsp_iov);
3472
	cifs_small_buf_release(iov.iov_base);
3473 3474 3475 3476
	if (rc) {
		cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
		goto qfsattr_exit;
	}
3477
	rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3478 3479 3480

	rsp_len = le32_to_cpu(rsp->OutputBufferLength);
	offset = le16_to_cpu(rsp->OutputBufferOffset);
3481 3482 3483 3484 3485
	rc = validate_buf(offset, rsp_len, &rsp->hdr, min_len);
	if (rc)
		goto qfsattr_exit;

	if (level == FS_ATTRIBUTE_INFORMATION)
3486 3487
		memcpy(&tcon->fsAttrInfo, 4 /* RFC1001 len */ + offset
			+ (char *)&rsp->hdr, min_t(unsigned int,
3488 3489 3490 3491
			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
3492 3493 3494 3495 3496 3497 3498
	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);
	}
3499 3500

qfsattr_exit:
3501
	free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3502 3503
	return rc;
}
3504 3505 3506 3507 3508 3509 3510 3511 3512

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];
3513
	struct kvec rsp_iov;
3514 3515
	int resp_buf_type;
	unsigned int count;
3516
	int flags = CIFS_NO_RESP;
3517
	unsigned int total_len;
3518

3519
	cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
3520

3521
	rc = smb2_plain_req_init(SMB2_LOCK, tcon, (void **) &req, &total_len);
3522 3523 3524
	if (rc)
		return rc;

3525 3526 3527
	if (encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

3528
	req->sync_hdr.ProcessId = cpu_to_le32(pid);
3529 3530 3531 3532 3533 3534 3535 3536
	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;
3537
	iov[0].iov_len = total_len - sizeof(struct smb2_lock_element);
3538 3539 3540 3541
	iov[1].iov_base = (char *)buf;
	iov[1].iov_len = count;

	cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
3542 3543
	rc = smb2_send_recv(xid, tcon->ses, iov, 2, &resp_buf_type, flags,
			    &rsp_iov);
3544
	cifs_small_buf_release(req);
3545
	if (rc) {
3546
		cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
3547 3548 3549 3550 3551 3552 3553 3554 3555 3556 3557 3558 3559 3560 3561 3562 3563 3564 3565 3566 3567 3568
		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);
}
3569 3570 3571 3572 3573 3574 3575

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;
3576
	int flags = CIFS_OBREAK_OP;
3577

3578
	cifs_dbg(FYI, "SMB2_lease_break\n");
3579 3580 3581 3582
	rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
	if (rc)
		return rc;

3583 3584 3585
	if (encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

3586
	req->hdr.sync_hdr.CreditRequest = cpu_to_le16(1);
3587 3588 3589 3590 3591 3592
	req->StructureSize = cpu_to_le16(36);
	inc_rfc1001_len(req, 12);

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

3593
	rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, flags);
3594
	cifs_small_buf_release(req);
3595 3596 3597

	if (rc) {
		cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
3598
		cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
3599 3600 3601 3602
	}

	return rc;
}