smb2pdu.c 97.8 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
/* offset is sizeof smb2_negotiate_req - 4 but rounded up to 8 bytes */
#define OFFSET_OF_NEG_CONTEXT 0x68  /* sizeof(struct smb2_negotiate_req) - 4 */


#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
assemble_neg_contexts(struct smb2_negotiate_req *req)
{

	/* +4 is to account for the RFC1001 len field */
	char *pneg_ctxt = (char *)req + OFFSET_OF_NEG_CONTEXT + 4;

	build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
	/* Add 2 to size to round to 8 byte boundary */
	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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	inc_rfc1001_len(req, 4 + sizeof(struct smb2_preauth_neg_context)
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			+ sizeof(struct smb2_encryption_neg_context)); /* calculate hash */
}
#else
static void assemble_neg_contexts(struct smb2_negotiate_req *req)
{
	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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	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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	}

	rc = small_smb2_init(SMB2_NEGOTIATE, NULL, (void **) &req);
	if (rc)
		return rc;

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	req->hdr.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);
		inc_rfc1001_len(req, 4);
	} 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);
		inc_rfc1001_len(req, 6);
	} else {
		/* otherwise send specific dialect */
		req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
		req->DialectCount = cpu_to_le16(1);
		inc_rfc1001_len(req, 2);
	}
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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);
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	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)
			assemble_neg_contexts(req);
	}
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	iov[0].iov_base = (char *)req;
	/* 4 for rfc1002 length field */
	iov[0].iov_len = get_rfc1002_length(req) + 4;

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	rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
	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;
	}

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	cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
582

583
	if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
584
		cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
585
	else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
586
		cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
587
	else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
588
		cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
S
Steve French 已提交
589 590
	else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
		cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
591 592 593 594
#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 */
595
	else {
596
		cifs_dbg(VFS, "Illegal dialect returned by server 0x%x\n",
597
			 le16_to_cpu(rsp->DialectRevision));
598 599 600 601 602
		rc = -EIO;
		goto neg_exit;
	}
	server->dialect = le16_to_cpu(rsp->DialectRevision);

603 604
	/* BB: add check that dialect was valid given dialect(s) we asked for */

605 606
	/* SMB2 only has an extended negflavor */
	server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
607 608 609
	/* 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);
610 611 612 613 614
	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);
615 616
	/* Internal types */
	server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
617 618 619

	security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
					       &rsp->hdr);
620 621 622 623 624 625 626
	/*
	 * 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.
	 */
627
	if (blob_length == 0) {
628
		cifs_dbg(FYI, "missing security blob on negprot\n");
629 630
		server->sec_ntlmssp = true;
	}
P
Pavel Shilovsky 已提交
631

632
	rc = cifs_enable_signing(server, ses->sign);
633 634
	if (rc)
		goto neg_exit;
635
	if (blob_length) {
636
		rc = decode_negTokenInit(security_blob, blob_length, server);
637 638 639 640
		if (rc == 1)
			rc = 0;
		else if (rc == 0)
			rc = -EIO;
641 642 643 644 645
	}
neg_exit:
	free_rsp_buf(resp_buftype, rsp);
	return rc;
}
646

647 648 649 650
int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
{
	int rc = 0;
	struct validate_negotiate_info_req vneg_inbuf;
651
	struct validate_negotiate_info_rsp *pneg_rsp = NULL;
652
	u32 rsplen;
653
	u32 inbuflen; /* max of 4 dialects */
654 655 656 657 658

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

	/*
	 * validation ioctl must be signed, so no point sending this if we
659 660
	 * can not sign it (ie are not known user).  Even if signing is not
	 * required (enabled but not negotiated), in those cases we selectively
661
	 * sign just this, the first and only signed request on a connection.
662
	 * Having validation of negotiate info  helps reduce attack vectors.
663
	 */
664
	if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
665 666
		return 0; /* validation requires signing */

667 668 669 670 671 672 673 674
	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");

675 676
	vneg_inbuf.Capabilities =
			cpu_to_le32(tcon->ses->server->vals->req_capabilities);
677 678
	memcpy(vneg_inbuf.Guid, tcon->ses->server->client_guid,
					SMB2_CLIENT_GUID_SIZE);
679 680 681 682 683 684 685 686 687 688

	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;

689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712

	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;
	}
713 714 715

	rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
		FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
716
		false /* use_ipc */,
717 718 719 720 721 722 723 724 725
		(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)) {
726 727 728 729
		cifs_dbg(VFS, "invalid protocol negotiate response size: %d\n",
			 rsplen);

		/* relax check since Mac returns max bufsize allowed on ioctl */
730 731
		if ((rsplen > CIFSMaxBufSize)
		     || (rsplen < sizeof(struct validate_negotiate_info_rsp)))
732
			goto err_rsp_free;
733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750
	}

	/* 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");
751
	kfree(pneg_rsp);
752 753 754 755
	return 0;

vneg_out:
	cifs_dbg(VFS, "protocol revalidation - security settings mismatch\n");
756 757
err_rsp_free:
	kfree(pneg_rsp);
758 759 760
	return -EIO;
}

S
Sachin Prabhu 已提交
761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782
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;
	}
}

783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813
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;

	rc = small_smb2_init(SMB2_SESSION_SETUP, NULL, (void **) &req);
	if (rc)
		return rc;

814 815
	/* First session, not a reauthenticate */
	req->hdr.sync_hdr.SessionId = 0;
816 817 818 819 820 821

	/* 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 */
822
	req->hdr.sync_hdr.CreditRequest = cpu_to_le16(3);
823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858

	/* 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;
	/* 4 for rfc1002 length field and 1 for pad */
	sess_data->iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
	/*
	 * 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;
859
	struct kvec rsp_iov = { NULL, 0 };
860 861 862 863 864 865 866 867 868 869 870 871 872 873

	/* Testing shows that buffer offset must be at location of Buffer[0] */
	req->SecurityBufferOffset =
		cpu_to_le16(sizeof(struct smb2_sess_setup_req) -
			1 /* pad */ - 4 /* rfc1001 len */);
	req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);

	inc_rfc1001_len(req, sess_data->iov[1].iov_len - 1 /* pad */);

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

	rc = SendReceive2(sess_data->xid, sess_data->ses,
				sess_data->iov, 2,
				&sess_data->buf0_type,
874 875 876
				CIFS_LOG_ERROR | CIFS_NEG_OP, &rsp_iov);
	cifs_small_buf_release(sess_data->iov[0].iov_base);
	memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
877 878 879 880 881 882 883 884 885 886 887

	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);
888
	if (ses->server->ops->generate_signingkey) {
889 890 891 892 893
		rc = ses->server->ops->generate_signingkey(ses);
		if (rc) {
			cifs_dbg(FYI,
				"SMB3 session key generation failed\n");
			mutex_unlock(&ses->server->srv_mutex);
894
			return rc;
895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963
		}
	}
	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;
964
	ses->Suid = rsp->hdr.sync_hdr.SessionId;
965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986

	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

987 988 989 990 991
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)
992
{
993 994
	int rc;
	struct cifs_ses *ses = sess_data->ses;
995
	struct smb2_sess_setup_rsp *rsp = NULL;
996
	char *ntlmssp_blob = NULL;
997
	bool use_spnego = false; /* else use raw ntlmssp */
998
	u16 blob_length = 0;
999

1000 1001 1002 1003 1004
	/*
	 * If memory allocation is successful, caller of this function
	 * frees it.
	 */
	ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1005 1006 1007 1008
	if (!ses->ntlmssp) {
		rc = -ENOMEM;
		goto out_err;
	}
1009
	ses->ntlmssp->sesskey_per_smbsess = true;
1010

1011
	rc = SMB2_sess_alloc_buffer(sess_data);
1012
	if (rc)
1013
		goto out_err;
1014

1015 1016 1017 1018 1019 1020
	ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
			       GFP_KERNEL);
	if (ntlmssp_blob == NULL) {
		rc = -ENOMEM;
		goto out;
	}
1021

1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033
	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;
1034

1035 1036
	rc = SMB2_sess_sendreceive(sess_data);
	rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1037

1038 1039
	/* If true, rc here is expected and not an error */
	if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1040
		rsp->hdr.sync_hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
1041
		rc = 0;
1042

1043 1044
	if (rc)
		goto out;
1045

1046 1047 1048 1049
	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));
1050
		rc = -EIO;
1051
		goto out;
1052
	}
1053 1054 1055 1056
	rc = decode_ntlmssp_challenge(rsp->Buffer,
			le16_to_cpu(rsp->SecurityBufferLength), ses);
	if (rc)
		goto out;
1057

1058
	cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1059 1060


1061
	ses->Suid = rsp->hdr.sync_hdr.SessionId;
1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077
	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;
}
1078

1079 1080 1081 1082 1083 1084 1085 1086 1087 1088
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;
1089

1090 1091 1092
	rc = SMB2_sess_alloc_buffer(sess_data);
	if (rc)
		goto out;
1093

1094
	req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
1095
	req->hdr.sync_hdr.SessionId = ses->Suid;
1096 1097 1098 1099 1100 1101

	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;
1102 1103
	}

1104 1105 1106 1107 1108 1109 1110 1111
	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;
1112

1113 1114 1115 1116 1117 1118
	rc = SMB2_sess_sendreceive(sess_data);
	if (rc)
		goto out;

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

1119
	ses->Suid = rsp->hdr.sync_hdr.SessionId;
1120 1121
	ses->session_flags = le16_to_cpu(rsp->SessionFlags);

1122 1123 1124 1125 1126 1127 1128 1129 1130
	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;
}
1131

1132 1133 1134
static int
SMB2_select_sec(struct cifs_ses *ses, struct SMB2_sess_data *sess_data)
{
S
Sachin Prabhu 已提交
1135 1136 1137 1138 1139 1140 1141 1142 1143
	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;
	}
1144

S
Sachin Prabhu 已提交
1145
	switch (type) {
1146 1147 1148 1149 1150 1151 1152
	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
1153
		cifs_dbg(VFS, "secType %d not supported!\n", type);
1154
		return -EOPNOTSUPP;
1155 1156
	}

1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172
	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;
1173 1174
	}

1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189
	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);

1190 1191
	if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign))
		cifs_dbg(VFS, "signing requested but authenticated as guest\n");
1192
	rc = sess_data->result;
1193
out:
1194
	kfree(sess_data);
1195 1196 1197 1198 1199 1200 1201 1202 1203
	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;
1204
	int flags = 0;
1205

1206
	cifs_dbg(FYI, "disconnect session %p\n", ses);
1207 1208 1209 1210 1211 1212

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

1213 1214 1215 1216
	/* no need to send SMB logoff if uid already closed due to reconnect */
	if (ses->need_reconnect)
		goto smb2_session_already_dead;

1217 1218 1219 1220 1221
	rc = small_smb2_init(SMB2_LOGOFF, NULL, (void **) &req);
	if (rc)
		return rc;

	 /* since no tcon, smb2_init can not do this, so do here */
1222
	req->hdr.sync_hdr.SessionId = ses->Suid;
1223 1224 1225 1226

	if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
		flags |= CIFS_TRANSFORM_REQ;
	else if (server->sign)
1227
		req->hdr.sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1228

1229
	rc = SendReceiveNoRsp(xid, ses, (char *) req, flags);
1230
	cifs_small_buf_release(req);
1231 1232 1233 1234
	/*
	 * No tcon so can't do
	 * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
	 */
1235 1236

smb2_session_already_dead:
1237 1238
	return rc;
}
1239 1240 1241

static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
{
1242
	cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
1243 1244 1245 1246
}

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

S
Steve French 已提交
1247 1248 1249 1250 1251 1252 1253 1254
/* 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;
}

1255 1256 1257 1258 1259 1260 1261
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];
1262
	struct kvec rsp_iov = { NULL, 0 };
1263 1264 1265 1266
	int rc = 0;
	int resp_buftype;
	int unc_path_len;
	__le16 *unc_path = NULL;
1267
	int flags = 0;
1268

1269
	cifs_dbg(FYI, "TCON\n");
1270

1271
	if (!(ses->server) || !tree)
1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284
		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;
	}

1285 1286 1287 1288
	/* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
	if (tcon)
		tcon->tid = 0;

1289 1290 1291 1292 1293 1294 1295
	rc = small_smb2_init(SMB2_TREE_CONNECT, tcon, (void **) &req);
	if (rc) {
		kfree(unc_path);
		return rc;
	}

	if (tcon == NULL) {
1296 1297 1298
		if ((ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA))
			flags |= CIFS_TRANSFORM_REQ;

1299
		/* since no tcon, smb2_init can not do this, so do here */
1300
		req->hdr.sync_hdr.SessionId = ses->Suid;
1301 1302
		if (ses->server->sign)
			req->hdr.sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1303 1304
	} else if (encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;
1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318

	iov[0].iov_base = (char *)req;
	/* 4 for rfc1002 length field and 1 for pad */
	iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;

	/* Testing shows that buffer offset must be at location of Buffer[0] */
	req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
			- 1 /* pad */ - 4 /* do not count rfc1001 len field */);
	req->PathLength = cpu_to_le16(unc_path_len - 2);
	iov[1].iov_base = unc_path;
	iov[1].iov_len = unc_path_len;

	inc_rfc1001_len(req, unc_path_len - 1 /* pad */);

1319
	rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, flags, &rsp_iov);
1320 1321
	cifs_small_buf_release(req);
	rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
1322 1323 1324 1325 1326 1327 1328 1329 1330 1331

	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) {
1332
		ses->ipc_tid = rsp->hdr.sync_hdr.TreeId;
1333 1334 1335
		goto tcon_exit;
	}

1336 1337
	switch (rsp->ShareType) {
	case SMB2_SHARE_TYPE_DISK:
1338
		cifs_dbg(FYI, "connection to disk share\n");
1339 1340
		break;
	case SMB2_SHARE_TYPE_PIPE:
1341
		tcon->ipc = true;
1342
		cifs_dbg(FYI, "connection to pipe share\n");
1343 1344 1345
		break;
	case SMB2_SHARE_TYPE_PRINT:
		tcon->ipc = true;
1346
		cifs_dbg(FYI, "connection to printer\n");
1347 1348
		break;
	default:
1349
		cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
1350 1351 1352 1353 1354
		rc = -EOPNOTSUPP;
		goto tcon_error_exit;
	}

	tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
1355
	tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
1356 1357 1358
	tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
	tcon->tidStatus = CifsGood;
	tcon->need_reconnect = false;
1359
	tcon->tid = rsp->hdr.sync_hdr.TreeId;
1360
	strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
1361 1362 1363

	if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
	    ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
1364
		cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
1365 1366 1367 1368 1369

	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
1370
	init_copy_chunk_defaults(tcon);
1371 1372
	if (tcon->ses->server->ops->validate_negotiate)
		rc = tcon->ses->server->ops->validate_negotiate(xid, tcon);
1373 1374 1375 1376 1377 1378
tcon_exit:
	free_rsp_buf(resp_buftype, rsp);
	kfree(unc_path);
	return rc;

tcon_error_exit:
1379
	if (rsp && rsp->hdr.sync_hdr.Status == STATUS_BAD_NETWORK_NAME) {
1380
		cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1381 1382 1383 1384 1385 1386 1387 1388 1389 1390
	}
	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;
1391
	int flags = 0;
1392

1393
	cifs_dbg(FYI, "Tree Disconnect\n");
1394

1395
	if (!ses || !(ses->server))
1396 1397 1398 1399 1400 1401 1402 1403 1404
		return -EIO;

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

	rc = small_smb2_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req);
	if (rc)
		return rc;

1405 1406 1407 1408
	if (encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

	rc = SendReceiveNoRsp(xid, ses, (char *)req, flags);
1409
	cifs_small_buf_release(req);
1410 1411 1412 1413 1414
	if (rc)
		cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);

	return rc;
}
1415

P
Pavel Shilovsky 已提交
1416

1417 1418 1419 1420 1421 1422 1423 1424 1425 1426
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
1427
					(struct create_durable, Data));
1428 1429 1430 1431
	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);
1432
	/* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
1433 1434 1435 1436 1437 1438 1439
	buf->Name[0] = 'D';
	buf->Name[1] = 'H';
	buf->Name[2] = 'n';
	buf->Name[3] = 'Q';
	return buf;
}

1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456
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;
1457
	/* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
1458 1459 1460 1461 1462 1463 1464
	buf->Name[0] = 'D';
	buf->Name[1] = 'H';
	buf->Name[2] = 'n';
	buf->Name[3] = 'C';
	return buf;
}

P
Pavel Shilovsky 已提交
1465
static __u8
1466 1467
parse_lease_state(struct TCP_Server_Info *server, struct smb2_create_rsp *rsp,
		  unsigned int *epoch)
P
Pavel Shilovsky 已提交
1468 1469
{
	char *data_offset;
1470
	struct create_context *cc;
1471 1472
	unsigned int next;
	unsigned int remaining;
1473
	char *name;
P
Pavel Shilovsky 已提交
1474

1475
	data_offset = (char *)rsp + 4 + le32_to_cpu(rsp->CreateContextsOffset);
1476
	remaining = le32_to_cpu(rsp->CreateContextsLength);
1477
	cc = (struct create_context *)data_offset;
1478
	while (remaining >= sizeof(struct create_context)) {
1479
		name = le16_to_cpu(cc->NameOffset) + (char *)cc;
1480 1481 1482 1483 1484 1485 1486 1487 1488 1489
		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
1490

1491
	return 0;
P
Pavel Shilovsky 已提交
1492 1493
}

1494
static int
1495 1496
add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
		  unsigned int *num_iovec, __u8 *oplock)
1497 1498 1499 1500
{
	struct smb2_create_req *req = iov[0].iov_base;
	unsigned int num = *num_iovec;

1501
	iov[num].iov_base = server->ops->create_lease_buf(oplock+1, *oplock);
1502 1503
	if (iov[num].iov_base == NULL)
		return -ENOMEM;
1504
	iov[num].iov_len = server->vals->create_lease_size;
1505 1506 1507 1508 1509
	req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
	if (!req->CreateContextsOffset)
		req->CreateContextsOffset = cpu_to_le32(
				sizeof(struct smb2_create_req) - 4 +
				iov[num - 1].iov_len);
1510 1511 1512
	le32_add_cpu(&req->CreateContextsLength,
		     server->vals->create_lease_size);
	inc_rfc1001_len(&req->hdr, server->vals->create_lease_size);
1513 1514 1515 1516
	*num_iovec = num + 1;
	return 0;
}

1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534
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);
1535
	generate_random_uuid(buf->dcontext.CreateGuid);
1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578
	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;
}

1579
static int
1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601
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 =
			cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
								iov[1].iov_len);
	le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
	inc_rfc1001_len(&req->hdr, 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,
1602
		    struct cifs_open_parms *oparms)
1603 1604 1605 1606
{
	struct smb2_create_req *req = iov[0].iov_base;
	unsigned int num = *num_iovec;

1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640
	/* 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 =
			cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
								iov[1].iov_len);
	le32_add_cpu(&req->CreateContextsLength,
			sizeof(struct create_durable_handle_reconnect_v2));
	inc_rfc1001_len(&req->hdr,
			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);
	}

1641 1642 1643 1644 1645 1646
	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();
1647 1648 1649 1650 1651 1652 1653
	if (iov[num].iov_base == NULL)
		return -ENOMEM;
	iov[num].iov_len = sizeof(struct create_durable);
	if (!req->CreateContextsOffset)
		req->CreateContextsOffset =
			cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
								iov[1].iov_len);
1654
	le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
1655 1656 1657 1658 1659
	inc_rfc1001_len(&req->hdr, sizeof(struct create_durable));
	*num_iovec = num + 1;
	return 0;
}

1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704
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;
}

1705
int
1706
SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
1707 1708
	  __u8 *oplock, struct smb2_file_all_info *buf,
	  struct smb2_err_rsp **err_buf)
1709 1710 1711 1712
{
	struct smb2_create_req *req;
	struct smb2_create_rsp *rsp;
	struct TCP_Server_Info *server;
1713
	struct cifs_tcon *tcon = oparms->tcon;
1714
	struct cifs_ses *ses = tcon->ses;
1715
	struct kvec iov[4];
1716
	struct kvec rsp_iov = {NULL, 0};
1717 1718
	int resp_buftype;
	int uni_path_len;
P
Pavel Shilovsky 已提交
1719 1720
	__le16 *copy_path = NULL;
	int copy_size;
1721
	int rc = 0;
1722
	unsigned int n_iov = 2;
1723
	__u32 file_attributes = 0;
1724
	char *dhc_buf = NULL, *lc_buf = NULL;
1725
	int flags = 0;
1726

1727
	cifs_dbg(FYI, "create/open\n");
1728 1729 1730 1731 1732 1733 1734 1735 1736 1737

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

	rc = small_smb2_init(SMB2_CREATE, tcon, (void **) &req);
	if (rc)
		return rc;

1738 1739 1740
	if (encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

1741
	if (oparms->create_options & CREATE_OPTION_READONLY)
1742
		file_attributes |= ATTR_READONLY;
1743 1744
	if (oparms->create_options & CREATE_OPTION_SPECIAL)
		file_attributes |= ATTR_SYSTEM;
1745

1746
	req->ImpersonationLevel = IL_IMPERSONATION;
1747
	req->DesiredAccess = cpu_to_le32(oparms->desired_access);
1748 1749 1750
	/* File attributes ignored on open (used in create though) */
	req->FileAttributes = cpu_to_le32(file_attributes);
	req->ShareAccess = FILE_SHARE_ALL_LE;
1751 1752
	req->CreateDisposition = cpu_to_le32(oparms->disposition);
	req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
1753 1754 1755 1756

	iov[0].iov_base = (char *)req;
	/* 4 for rfc1002 length field */
	iov[0].iov_len = get_rfc1002_length(req) + 4;
1757 1758
	/* -1 since last byte is buf[0] which is sent below (path) */
	iov[0].iov_len--;
1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779

	req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req) - 4);

	/* [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;

		req->hdr.sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
		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);
1780 1781
		uni_path_len = copy_size;
		path = copy_path;
1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795
	} 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;
		}
1796 1797
	}

1798 1799 1800 1801 1802
	iov[1].iov_len = uni_path_len;
	iov[1].iov_base = path;
	/* -1 since last byte is buf[0] which was counted in smb2_buf_len */
	inc_rfc1001_len(req, uni_path_len - 1);

P
Pavel Shilovsky 已提交
1803 1804 1805
	if (!server->oplocks)
		*oplock = SMB2_OPLOCK_LEVEL_NONE;

1806
	if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
P
Pavel Shilovsky 已提交
1807 1808 1809
	    *oplock == SMB2_OPLOCK_LEVEL_NONE)
		req->RequestedOplockLevel = *oplock;
	else {
1810
		rc = add_lease_context(server, iov, &n_iov, oplock);
1811
		if (rc) {
P
Pavel Shilovsky 已提交
1812 1813
			cifs_small_buf_release(req);
			kfree(copy_path);
1814
			return rc;
P
Pavel Shilovsky 已提交
1815
		}
1816
		lc_buf = iov[n_iov-1].iov_base;
P
Pavel Shilovsky 已提交
1817 1818
	}

1819 1820
	if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
		/* need to set Next field of lease context if we request it */
1821
		if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
1822
			struct create_context *ccontext =
1823
			    (struct create_context *)iov[n_iov-1].iov_base;
1824
			ccontext->Next =
1825
				cpu_to_le32(server->vals->create_lease_size);
1826
		}
1827

1828
		rc = add_durable_context(iov, &n_iov, oparms,
1829
					tcon->use_persistent);
1830 1831 1832
		if (rc) {
			cifs_small_buf_release(req);
			kfree(copy_path);
1833
			kfree(lc_buf);
1834 1835
			return rc;
		}
1836
		dhc_buf = iov[n_iov-1].iov_base;
1837 1838
	}

1839
	rc = SendReceive2(xid, ses, iov, n_iov, &resp_buftype, flags, &rsp_iov);
1840 1841
	cifs_small_buf_release(req);
	rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
1842 1843 1844

	if (rc != 0) {
		cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
1845
		if (err_buf && rsp)
1846 1847
			*err_buf = kmemdup(rsp, get_rfc1002_length(rsp) + 4,
					   GFP_KERNEL);
1848 1849 1850
		goto creat_exit;
	}

1851 1852
	oparms->fid->persistent_fid = rsp->PersistentFileId;
	oparms->fid->volatile_fid = rsp->VolatileFileId;
1853 1854 1855 1856 1857 1858 1859 1860 1861

	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
1862

P
Pavel Shilovsky 已提交
1863
	if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
1864
		*oplock = parse_lease_state(server, rsp, &oparms->fid->epoch);
P
Pavel Shilovsky 已提交
1865 1866
	else
		*oplock = rsp->OplockLevel;
1867
creat_exit:
P
Pavel Shilovsky 已提交
1868
	kfree(copy_path);
1869 1870
	kfree(lc_buf);
	kfree(dhc_buf);
1871 1872 1873 1874
	free_rsp_buf(resp_buftype, rsp);
	return rc;
}

1875 1876 1877 1878 1879
/*
 *	SMB2 IOCTL is used for both IOCTLs and FSCTLs
 */
int
SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1880 1881 1882
	   u64 volatile_fid, u32 opcode, bool is_fsctl, bool use_ipc,
	   char *in_data, u32 indatalen,
	   char **out_data, u32 *plen /* returned data len */)
1883 1884 1885
{
	struct smb2_ioctl_req *req;
	struct smb2_ioctl_rsp *rsp;
1886
	struct smb2_sync_hdr *shdr;
1887
	struct cifs_ses *ses;
1888
	struct kvec iov[2];
1889
	struct kvec rsp_iov;
1890
	int resp_buftype;
1891
	int n_iov;
1892
	int rc = 0;
1893
	int flags = 0;
1894 1895 1896

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

1897 1898 1899
	if (out_data != NULL)
		*out_data = NULL;

1900 1901 1902 1903
	/* zero out returned data len, in case of error */
	if (plen)
		*plen = 0;

1904 1905 1906 1907 1908
	if (tcon)
		ses = tcon->ses;
	else
		return -EIO;

1909
	if (!ses || !(ses->server))
1910 1911 1912 1913 1914 1915
		return -EIO;

	rc = small_smb2_init(SMB2_IOCTL, tcon, (void **) &req);
	if (rc)
		return rc;

1916 1917 1918 1919 1920 1921 1922 1923 1924 1925
	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",
			 req->hdr.sync_hdr.TreeId, ses->ipc_tid);
		req->hdr.sync_hdr.TreeId = ses->ipc_tid;
	}
1926 1927 1928
	if (encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939
	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 =
		       cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer) - 4);
		iov[1].iov_base = in_data;
		iov[1].iov_len = indatalen;
1940
		n_iov = 2;
1941
	} else
1942
		n_iov = 1;
1943 1944 1945 1946 1947 1948 1949 1950 1951

	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
1952 1953 1954 1955
	 * 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
1956
	 */
1957
	req->MaxOutputResponse = cpu_to_le32(CIFSMaxBufSize);
1958 1959 1960 1961 1962 1963 1964 1965

	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
1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981
	/*
	 * 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
	 * input data (in iovec[1]). We also must add 4 bytes
	 * in first iovec to allow for rfc1002 length field.
	 */

	if (indatalen) {
		iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
		inc_rfc1001_len(req, indatalen - 1);
	} else
		iov[0].iov_len = get_rfc1002_length(req) + 4;

1982

1983
	rc = SendReceive2(xid, ses, iov, n_iov, &resp_buftype, flags, &rsp_iov);
1984 1985
	cifs_small_buf_release(req);
	rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
1986

1987
	if ((rc != 0) && (rc != -EINVAL)) {
1988
		cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1989
		goto ioctl_exit;
1990 1991 1992
	} else if (rc == -EINVAL) {
		if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
		    (opcode != FSCTL_SRV_COPYCHUNK)) {
1993
			cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1994 1995
			goto ioctl_exit;
		}
1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027
	}

	/* 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;
	}

2028 2029
	shdr = get_sync_hdr(rsp);
	memcpy(*out_data, (char *)shdr + le32_to_cpu(rsp->OutputOffset), *plen);
2030 2031 2032 2033 2034
ioctl_exit:
	free_rsp_buf(resp_buftype, rsp);
	return rc;
}

2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047
/*
 *   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 =
2048
			cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
2049 2050 2051

	rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
			FSCTL_SET_COMPRESSION, true /* is_fsctl */,
2052
			false /* use_ipc */,
2053 2054 2055 2056 2057 2058 2059 2060
			(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;
}

2061 2062 2063 2064 2065 2066 2067 2068
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];
2069
	struct kvec rsp_iov;
2070 2071
	int resp_buftype;
	int rc = 0;
2072
	int flags = 0;
2073

2074
	cifs_dbg(FYI, "Close\n");
2075

2076
	if (!ses || !(ses->server))
2077 2078 2079 2080 2081 2082
		return -EIO;

	rc = small_smb2_init(SMB2_CLOSE, tcon, (void **) &req);
	if (rc)
		return rc;

2083 2084 2085
	if (encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

2086 2087 2088 2089 2090 2091 2092
	req->PersistentFileId = persistent_fid;
	req->VolatileFileId = volatile_fid;

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

2093
	rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
2094 2095
	cifs_small_buf_release(req);
	rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
2096 2097

	if (rc != 0) {
2098
		cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
2099 2100 2101 2102 2103 2104 2105 2106 2107
		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
2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120

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) {
2121 2122
		cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
			 buffer_length, min_buf_size);
P
Pavel Shilovsky 已提交
2123 2124 2125 2126 2127
		return -EINVAL;
	}

	/* check if beyond RFC1001 maximum length */
	if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
2128 2129
		cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
			 buffer_length, smb_len);
P
Pavel Shilovsky 已提交
2130 2131 2132 2133
		return -EINVAL;
	}

	if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
2134
		cifs_dbg(VFS, "illegal server response, bad offset to data\n");
P
Pavel Shilovsky 已提交
2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165
		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;
}

2166 2167
static int
query_info(const unsigned int xid, struct cifs_tcon *tcon,
2168 2169 2170
	   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
2171 2172 2173 2174
{
	struct smb2_query_info_req *req;
	struct smb2_query_info_rsp *rsp = NULL;
	struct kvec iov[2];
2175
	struct kvec rsp_iov;
P
Pavel Shilovsky 已提交
2176 2177 2178
	int rc = 0;
	int resp_buftype;
	struct cifs_ses *ses = tcon->ses;
2179
	int flags = 0;
P
Pavel Shilovsky 已提交
2180

2181
	cifs_dbg(FYI, "Query Info\n");
P
Pavel Shilovsky 已提交
2182

2183
	if (!ses || !(ses->server))
P
Pavel Shilovsky 已提交
2184 2185 2186 2187 2188 2189
		return -EIO;

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

2190 2191 2192
	if (encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

2193
	req->InfoType = info_type;
2194
	req->FileInfoClass = info_class;
P
Pavel Shilovsky 已提交
2195 2196
	req->PersistentFileId = persistent_fid;
	req->VolatileFileId = volatile_fid;
2197
	req->AdditionalInformation = cpu_to_le32(additional_info);
2198 2199 2200 2201 2202 2203 2204

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

2205
	req->OutputBufferLength = cpu_to_le32(output_len);
P
Pavel Shilovsky 已提交
2206 2207 2208 2209 2210

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

2211
	rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
2212 2213
	cifs_small_buf_release(req);
	rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
2214

P
Pavel Shilovsky 已提交
2215 2216 2217 2218 2219
	if (rc) {
		cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
		goto qinf_exit;
	}

2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233
	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
2234 2235
	rc = validate_and_copy_buf(le16_to_cpu(rsp->OutputBufferOffset),
				   le32_to_cpu(rsp->OutputBufferLength),
2236
				   &rsp->hdr, min_len, *data);
P
Pavel Shilovsky 已提交
2237 2238 2239 2240 2241

qinf_exit:
	free_rsp_buf(resp_buftype, rsp);
	return rc;
}
2242

2243
int SMB2_query_eas(const unsigned int xid, struct cifs_tcon *tcon,
2244 2245
		   u64 persistent_fid, u64 volatile_fid,
		   int ea_buf_size, struct smb2_file_full_ea_info *data)
2246 2247 2248
{
	return query_info(xid, tcon, persistent_fid, volatile_fid,
			  FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE, 0,
2249
			  ea_buf_size,
2250 2251 2252 2253 2254
			  sizeof(struct smb2_file_full_ea_info),
			  (void **)&data,
			  NULL);
}

2255 2256 2257 2258 2259 2260 2261 2262 2263 2264
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);
}

2265
int
2266
SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
2267
		u64 persistent_fid, u64 volatile_fid,
2268
		void **data, u32 *plen)
2269
{
2270 2271 2272
	__u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO;
	*plen = 0;

2273
	return query_info(xid, tcon, persistent_fid, volatile_fid,
2274 2275 2276
			  0, SMB2_O_INFO_SECURITY, additional_info,
			  SMB2_MAX_BUFFER_SIZE,
			  sizeof(struct smb2_file_all_info), data, plen);
2277 2278 2279 2280 2281 2282 2283
}

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,
2284 2285
			  FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
			  sizeof(struct smb2_file_internal_info),
2286
			  sizeof(struct smb2_file_internal_info),
2287
			  (void **)&uniqueid, NULL);
2288 2289
}

2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300
/*
 * 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;
2301
	struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
2302 2303 2304
	unsigned int credits_received = 1;

	if (mid->mid_state == MID_RESPONSE_RECEIVED)
2305
		credits_received = le16_to_cpu(rsp->hdr.sync_hdr.CreditRequest);
2306 2307 2308 2309 2310

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

2311 2312 2313 2314 2315 2316 2317 2318
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;
2319 2320 2321
	int rc;
	int resched = false;

2322 2323 2324 2325 2326 2327 2328 2329 2330 2331

	/* 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) {
2332
			if (tcon->need_reconnect || tcon->need_reopen_files) {
2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348
				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) {
2349 2350
		rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon);
		if (!rc)
2351
			cifs_reopen_persistent_handles(tcon);
2352 2353
		else
			resched = true;
2354 2355 2356 2357 2358
		list_del_init(&tcon->rlist);
		cifs_put_tcon(tcon);
	}

	cifs_dbg(FYI, "Reconnecting tcons finished\n");
2359 2360
	if (resched)
		queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
2361 2362 2363 2364 2365 2366 2367
	mutex_unlock(&server->reconnect_mutex);

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

2368 2369 2370 2371 2372
int
SMB2_echo(struct TCP_Server_Info *server)
{
	struct smb2_echo_req *req;
	int rc = 0;
2373 2374 2375
	struct kvec iov[2];
	struct smb_rqst rqst = { .rq_iov = iov,
				 .rq_nvec = 2 };
2376

2377
	cifs_dbg(FYI, "In echo request\n");
2378

2379
	if (server->tcpStatus == CifsNeedNegotiate) {
2380 2381 2382
		/* No need to send echo on newly established connections */
		queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
		return rc;
2383 2384
	}

2385 2386 2387 2388
	rc = small_smb2_init(SMB2_ECHO, NULL, (void **)&req);
	if (rc)
		return rc;

2389
	req->hdr.sync_hdr.CreditRequest = cpu_to_le16(1);
2390 2391

	/* 4 for rfc1002 length field */
2392 2393 2394 2395
	iov[0].iov_len = 4;
	iov[0].iov_base = (char *)req;
	iov[1].iov_len = get_rfc1002_length(req);
	iov[1].iov_base = (char *)req + 4;
2396

P
Pavel Shilovsky 已提交
2397 2398
	rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
			     server, CIFS_ECHO_OP);
2399
	if (rc)
2400
		cifs_dbg(FYI, "Echo request failed: %d\n", rc);
2401 2402 2403 2404

	cifs_small_buf_release(req);
	return rc;
}
2405 2406 2407 2408 2409 2410 2411 2412

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];
2413
	struct kvec rsp_iov;
2414 2415
	int resp_buftype;
	int rc = 0;
2416
	int flags = 0;
2417

2418
	cifs_dbg(FYI, "Flush\n");
2419

2420
	if (!ses || !(ses->server))
2421 2422 2423 2424 2425 2426
		return -EIO;

	rc = small_smb2_init(SMB2_FLUSH, tcon, (void **) &req);
	if (rc)
		return rc;

2427 2428 2429
	if (encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

2430 2431 2432 2433 2434 2435 2436
	req->PersistentFileId = persistent_fid;
	req->VolatileFileId = volatile_fid;

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

2437
	rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
2438
	cifs_small_buf_release(req);
2439

2440
	if (rc != 0)
2441 2442
		cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);

2443
	free_rsp_buf(resp_buftype, rsp_iov.iov_base);
2444 2445
	return rc;
}
2446 2447 2448 2449 2450 2451

/*
 * 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
2452 2453 2454
smb2_new_read_req(void **buf, unsigned int *total_len,
		  struct cifs_io_parms *io_parms, unsigned int remaining_bytes,
		  int request_type)
2455 2456
{
	int rc = -EACCES;
2457
	struct smb2_read_plain_req *req = NULL;
2458
	struct smb2_sync_hdr *shdr;
2459

2460 2461
	rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, (void **) &req,
				 total_len);
2462 2463 2464 2465 2466
	if (rc)
		return rc;
	if (io_parms->tcon->ses->server == NULL)
		return -ECONNABORTED;

2467
	shdr = &req->sync_hdr;
2468
	shdr->ProcessId = cpu_to_le32(io_parms->pid);
2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480

	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)) {
2481 2482 2483
			/* next 8-byte aligned request */
			*total_len = DIV_ROUND_UP(*total_len, 8) * 8;
			shdr->NextCommand = cpu_to_le32(*total_len);
2484
		} else /* END_OF_CHAIN */
2485
			shdr->NextCommand = 0;
2486
		if (request_type & RELATED_REQUEST) {
2487
			shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
2488 2489 2490 2491
			/*
			 * Related requests use info from previous read request
			 * in chain.
			 */
2492 2493
			shdr->SessionId = 0xFFFFFFFF;
			shdr->TreeId = 0xFFFFFFFF;
2494 2495 2496 2497 2498 2499 2500 2501 2502
			req->PersistentFileId = 0xFFFFFFFF;
			req->VolatileFileId = 0xFFFFFFFF;
		}
	}
	if (remaining_bytes > io_parms->length)
		req->RemainingBytes = cpu_to_le32(remaining_bytes);
	else
		req->RemainingBytes = 0;

2503
	*buf = req;
2504 2505 2506 2507 2508 2509 2510 2511 2512
	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;
2513 2514
	struct smb2_sync_hdr *shdr =
				(struct smb2_sync_hdr *)rdata->iov[1].iov_base;
2515
	unsigned int credits_received = 1;
2516 2517
	struct smb_rqst rqst = { .rq_iov = rdata->iov,
				 .rq_nvec = 2,
2518 2519 2520 2521
				 .rq_pages = rdata->pages,
				 .rq_npages = rdata->nr_pages,
				 .rq_pagesz = rdata->pagesz,
				 .rq_tailsz = rdata->tailsz };
2522

2523 2524 2525
	cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
		 __func__, mid->mid, mid->mid_state, rdata->result,
		 rdata->bytes);
2526 2527 2528

	switch (mid->mid_state) {
	case MID_RESPONSE_RECEIVED:
2529
		credits_received = le16_to_cpu(shdr->CreditRequest);
2530
		/* result already set, check signature */
2531
		if (server->sign && !mid->decrypted) {
P
Pavel Shilovsky 已提交
2532 2533
			int rc;

2534
			rc = smb2_verify_signature(&rqst, server);
P
Pavel Shilovsky 已提交
2535
			if (rc)
2536 2537
				cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
					 rc);
P
Pavel Shilovsky 已提交
2538
		}
2539
		/* FIXME: should this be counted toward the initiating task? */
2540 2541
		task_io_account_read(rdata->got_bytes);
		cifs_stats_bytes_read(tcon, rdata->got_bytes);
2542 2543 2544 2545
		break;
	case MID_REQUEST_SUBMITTED:
	case MID_RETRY_NEEDED:
		rdata->result = -EAGAIN;
2546 2547 2548 2549 2550 2551
		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);
2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565
		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);
}

2566
/* smb2_async_readv - send an async read, and set up mid to handle result */
2567 2568 2569
int
smb2_async_readv(struct cifs_readdata *rdata)
{
2570
	int rc, flags = 0;
2571 2572
	char *buf;
	struct smb2_sync_hdr *shdr;
2573
	struct cifs_io_parms io_parms;
2574 2575
	struct smb_rqst rqst = { .rq_iov = rdata->iov,
				 .rq_nvec = 2 };
2576
	struct TCP_Server_Info *server;
2577
	unsigned int total_len;
2578
	__be32 req_len;
2579

2580 2581
	cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
		 __func__, rdata->offset, rdata->bytes);
2582 2583 2584 2585 2586 2587 2588

	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;
2589 2590 2591

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

2592
	rc = smb2_new_read_req((void **) &buf, &total_len, &io_parms, 0, 0);
2593 2594 2595 2596 2597 2598 2599 2600 2601
	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);
		}
2602
		return rc;
2603
	}
2604

2605 2606 2607
	if (encryption_required(io_parms.tcon))
		flags |= CIFS_TRANSFORM_REQ;

2608 2609 2610 2611 2612 2613 2614 2615
	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;
2616

2617
	if (rdata->credits) {
2618
		shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
2619
						SMB2_MAX_BUFFER_SIZE));
2620
		shdr->CreditRequest = shdr->CreditCharge;
2621 2622
		spin_lock(&server->req_lock);
		server->credits += rdata->credits -
2623
						le16_to_cpu(shdr->CreditCharge);
2624 2625
		spin_unlock(&server->req_lock);
		wake_up(&server->request_q);
2626
		flags |= CIFS_HAS_CREDITS;
2627 2628
	}

2629
	kref_get(&rdata->refcount);
2630
	rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
2631
			     cifs_readv_receive, smb2_readv_callback,
2632
			     smb3_handle_read_data, rdata, flags);
2633
	if (rc) {
2634
		kref_put(&rdata->refcount, cifs_readdata_release);
2635 2636
		cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
	}
2637 2638 2639 2640

	cifs_small_buf_release(buf);
	return rc;
}
2641

2642 2643 2644 2645 2646
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;
2647
	struct smb2_read_plain_req *req = NULL;
2648
	struct smb2_read_rsp *rsp = NULL;
2649
	struct smb2_sync_hdr *shdr;
2650
	struct kvec iov[2];
2651
	struct kvec rsp_iov;
2652
	unsigned int total_len;
2653 2654 2655
	__be32 req_len;
	struct smb_rqst rqst = { .rq_iov = iov,
				 .rq_nvec = 2 };
2656 2657
	int flags = CIFS_LOG_ERROR;
	struct cifs_ses *ses = io_parms->tcon->ses;
2658 2659

	*nbytes = 0;
2660
	rc = smb2_new_read_req((void **)&req, &total_len, io_parms, 0, 0);
2661 2662 2663
	if (rc)
		return rc;

2664 2665 2666
	if (encryption_required(io_parms->tcon))
		flags |= CIFS_TRANSFORM_REQ;

2667
	req_len = cpu_to_be32(total_len);
2668

2669 2670 2671 2672 2673
	iov[0].iov_base = &req_len;
	iov[0].iov_len = sizeof(__be32);
	iov[1].iov_base = req;
	iov[1].iov_len = total_len;

2674
	rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2675
	cifs_small_buf_release(req);
2676

2677
	rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
2678
	shdr = get_sync_hdr(rsp);
2679

2680
	if (shdr->Status == STATUS_END_OF_FILE) {
2681
		free_rsp_buf(resp_buftype, rsp_iov.iov_base);
2682 2683 2684 2685 2686
		return 0;
	}

	if (rc) {
		cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
2687
		cifs_dbg(VFS, "Send error in read = %d\n", rc);
2688 2689 2690 2691
	} else {
		*nbytes = le32_to_cpu(rsp->DataLength);
		if ((*nbytes > CIFS_MAX_MSGSIZE) ||
		    (*nbytes > io_parms->length)) {
2692 2693
			cifs_dbg(FYI, "bad length %d for count %d\n",
				 *nbytes, io_parms->length);
2694 2695 2696 2697 2698 2699
			rc = -EIO;
			*nbytes = 0;
		}
	}

	if (*buf) {
2700
		memcpy(*buf, (char *)shdr + rsp->DataOffset, *nbytes);
2701
		free_rsp_buf(resp_buftype, rsp_iov.iov_base);
2702
	} else if (resp_buftype != CIFS_NO_BUFFER) {
2703
		*buf = rsp_iov.iov_base;
2704 2705 2706 2707 2708 2709 2710 2711
		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;
}

2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726
/*
 * 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:
2727
		credits_received = le16_to_cpu(rsp->hdr.sync_hdr.CreditRequest);
2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 2764 2765
		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
2766 2767
smb2_async_writev(struct cifs_writedata *wdata,
		  void (*release)(struct kref *kref))
2768
{
2769
	int rc = -EACCES, flags = 0;
2770
	struct smb2_write_req *req = NULL;
2771
	struct smb2_sync_hdr *shdr;
2772
	struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
2773
	struct TCP_Server_Info *server = tcon->ses->server;
2774 2775
	struct kvec iov[2];
	struct smb_rqst rqst = { };
2776 2777

	rc = small_smb2_init(SMB2_WRITE, tcon, (void **) &req);
2778 2779 2780 2781 2782 2783 2784 2785 2786
	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);
		}
2787
		goto async_writev_out;
2788
	}
2789

2790 2791 2792
	if (encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

2793 2794
	shdr = get_sync_hdr(req);
	shdr->ProcessId = cpu_to_le32(wdata->cfile->pid);
2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807

	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);
	/* 4 for rfc1002 length field */
	req->DataOffset = cpu_to_le16(
				offsetof(struct smb2_write_req, Buffer) - 4);
	req->RemainingBytes = 0;

	/* 4 for rfc1002 length field and 1 for Buffer */
2808 2809 2810 2811
	iov[0].iov_len = 4;
	iov[0].iov_base = req;
	iov[1].iov_len = get_rfc1002_length(req) - 1;
	iov[1].iov_base = (char *)req + 4;
2812

2813 2814
	rqst.rq_iov = iov;
	rqst.rq_nvec = 2;
2815 2816 2817 2818
	rqst.rq_pages = wdata->pages;
	rqst.rq_npages = wdata->nr_pages;
	rqst.rq_pagesz = wdata->pagesz;
	rqst.rq_tailsz = wdata->tailsz;
2819

2820 2821
	cifs_dbg(FYI, "async write at %llu %u bytes\n",
		 wdata->offset, wdata->bytes);
2822 2823 2824 2825 2826

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

	inc_rfc1001_len(&req->hdr, wdata->bytes - 1 /* Buffer */);

2827
	if (wdata->credits) {
2828
		shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
2829
						    SMB2_MAX_BUFFER_SIZE));
2830
		shdr->CreditRequest = shdr->CreditCharge;
2831 2832
		spin_lock(&server->req_lock);
		server->credits += wdata->credits -
2833
						le16_to_cpu(shdr->CreditCharge);
2834 2835
		spin_unlock(&server->req_lock);
		wake_up(&server->request_q);
2836
		flags |= CIFS_HAS_CREDITS;
2837 2838
	}

2839
	kref_get(&wdata->refcount);
P
Pavel Shilovsky 已提交
2840 2841
	rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
			     wdata, flags);
2842

2843
	if (rc) {
2844
		kref_put(&wdata->refcount, release);
2845 2846
		cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
	}
2847 2848 2849 2850 2851

async_writev_out:
	cifs_small_buf_release(req);
	return rc;
}
2852 2853 2854 2855 2856 2857 2858 2859 2860 2861 2862 2863 2864 2865 2866

/*
 * 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;
2867
	struct kvec rsp_iov;
2868
	int flags = 0;
2869

2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881
	*nbytes = 0;

	if (n_vec < 1)
		return rc;

	rc = small_smb2_init(SMB2_WRITE, io_parms->tcon, (void **) &req);
	if (rc)
		return rc;

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

2882 2883 2884
	if (encryption_required(io_parms->tcon))
		flags |= CIFS_TRANSFORM_REQ;

2885
	req->hdr.sync_hdr.ProcessId = cpu_to_le32(io_parms->pid);
2886 2887 2888 2889 2890 2891 2892 2893 2894 2895 2896 2897 2898 2899 2900 2901 2902 2903 2904 2905 2906

	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);
	/* 4 for rfc1002 length field */
	req->DataOffset = cpu_to_le16(
				offsetof(struct smb2_write_req, Buffer) - 4);
	req->RemainingBytes = 0;

	iov[0].iov_base = (char *)req;
	/* 4 for rfc1002 length field and 1 for Buffer */
	iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;

	/* length of entire message including data to be written */
	inc_rfc1001_len(req, io_parms->length - 1 /* Buffer */);

	rc = SendReceive2(xid, io_parms->tcon->ses, iov, n_vec + 1,
2907
			  &resp_buftype, flags, &rsp_iov);
2908 2909
	cifs_small_buf_release(req);
	rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
2910 2911 2912

	if (rc) {
		cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
2913
		cifs_dbg(VFS, "Send error in write = %d\n", rc);
2914
	} else
2915
		*nbytes = le32_to_cpu(rsp->DataLength);
2916 2917

	free_rsp_buf(resp_buftype, rsp);
2918 2919
	return rc;
}
2920

2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938
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) {
2939
			cifs_dbg(VFS, "malformed search entry would overflow\n");
2940 2941 2942 2943 2944
			break;
		}

		len = le32_to_cpu(entryptr->FileNameLength);
		if ((char *)entryptr + len + size > end_of_buf) {
2945 2946
			cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
				 end_of_buf);
2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971
			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];
2972
	struct kvec rsp_iov;
2973 2974
	int rc = 0;
	int len;
2975
	int resp_buftype = CIFS_NO_BUFFER;
2976 2977 2978 2979 2980 2981 2982
	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;
2983
	int flags = 0;
2984 2985 2986 2987 2988 2989 2990 2991 2992 2993

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

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

2994 2995 2996
	if (encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

2997 2998 2999 3000 3001 3002 3003 3004 3005 3006
	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:
3007 3008
		cifs_dbg(VFS, "info level %u isn't supported\n",
			 srch_inf->info_level);
3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024 3025 3026 3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040
		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 */);

3041
	rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, flags, &rsp_iov);
3042 3043
	cifs_small_buf_release(req);
	rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
3044

3045
	if (rc) {
3046 3047
		if (rc == -ENODATA &&
		    rsp->hdr.sync_hdr.Status == STATUS_NO_MORE_FILES) {
3048 3049 3050
			srch_inf->endOfSearch = true;
			rc = 0;
		}
3051 3052 3053 3054 3055 3056 3057 3058 3059 3060 3061 3062 3063 3064 3065 3066 3067 3068 3069 3070 3071 3072 3073 3074 3075 3076 3077
		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;
3078 3079 3080
	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);
3081 3082 3083 3084 3085
	if (resp_buftype == CIFS_LARGE_BUFFER)
		srch_inf->smallBuf = false;
	else if (resp_buftype == CIFS_SMALL_BUFFER)
		srch_inf->smallBuf = true;
	else
3086
		cifs_dbg(VFS, "illegal search buffer type\n");
3087 3088 3089 3090 3091 3092 3093 3094

	return rc;

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

3095 3096
static int
send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
3097 3098 3099
	       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)
3100 3101 3102 3103
{
	struct smb2_set_info_req *req;
	struct smb2_set_info_rsp *rsp = NULL;
	struct kvec *iov;
3104
	struct kvec rsp_iov;
3105 3106 3107 3108
	int rc = 0;
	int resp_buftype;
	unsigned int i;
	struct cifs_ses *ses = tcon->ses;
3109
	int flags = 0;
3110

3111
	if (!ses || !(ses->server))
3112 3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 3123 3124 3125 3126
		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;
	}

3127 3128 3129
	if (encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

3130
	req->hdr.sync_hdr.ProcessId = cpu_to_le32(pid);
3131

3132
	req->InfoType = info_type;
3133 3134 3135
	req->FileInfoClass = info_class;
	req->PersistentFileId = persistent_fid;
	req->VolatileFileId = volatile_fid;
3136
	req->AdditionalInformation = cpu_to_le32(additional_info);
3137 3138 3139 3140 3141 3142 3143 3144 3145 3146 3147 3148 3149 3150 3151 3152 3153 3154 3155 3156 3157

	/* 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];
	}

3158
	rc = SendReceive2(xid, ses, iov, num, &resp_buftype, flags, &rsp_iov);
3159 3160
	cifs_small_buf_release(req);
	rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
3161

3162
	if (rc != 0)
3163
		cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
3164

3165 3166 3167 3168 3169 3170 3171 3172 3173 3174 3175 3176 3177 3178 3179 3180 3181 3182 3183 3184 3185 3186 3187 3188 3189 3190 3191 3192 3193 3194 3195
	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,
3196 3197
		current->tgid, FILE_RENAME_INFORMATION, SMB2_O_INFO_FILE,
		0, 2, data, size);
3198 3199 3200
	kfree(data);
	return rc;
}
3201

3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212 3213
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,
3214 3215
		current->tgid, FILE_DISPOSITION_INFORMATION, SMB2_O_INFO_FILE,
		0, 1, &data, &size);
3216 3217
}

3218 3219 3220 3221 3222 3223 3224 3225 3226 3227 3228 3229 3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241 3242 3243
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,
3244 3245
			current->tgid, FILE_LINK_INFORMATION, SMB2_O_INFO_FILE,
			0, 2, data, size);
3246 3247 3248
	kfree(data);
	return rc;
}
3249 3250 3251

int
SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3252
	     u64 volatile_fid, u32 pid, __le64 *eof, bool is_falloc)
3253 3254 3255 3256 3257 3258 3259 3260 3261 3262
{
	struct smb2_file_eof_info info;
	void *data;
	unsigned int size;

	info.EndOfFile = *eof;

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

3263 3264
	if (is_falloc)
		return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3265 3266
			pid, FILE_ALLOCATION_INFORMATION, SMB2_O_INFO_FILE,
			0, 1, &data, &size);
3267 3268
	else
		return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3269 3270
			pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
			0, 1, &data, &size);
3271
}
3272 3273 3274 3275 3276 3277 3278 3279

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,
3280 3281 3282 3283 3284 3285 3286 3287 3288 3289 3290 3291
		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);
3292
}
3293

3294 3295 3296 3297 3298 3299 3300 3301 3302 3303
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);
}

3304 3305 3306 3307 3308 3309 3310
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;
3311
	int flags = CIFS_OBREAK_OP;
3312

3313
	cifs_dbg(FYI, "SMB2_oplock_break\n");
3314 3315 3316 3317
	rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
	if (rc)
		return rc;

3318 3319 3320
	if (encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

3321 3322 3323
	req->VolatileFid = volatile_fid;
	req->PersistentFid = persistent_fid;
	req->OplockLevel = oplock_level;
3324
	req->hdr.sync_hdr.CreditRequest = cpu_to_le16(1);
3325

3326
	rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, flags);
3327
	cifs_small_buf_release(req);
3328 3329 3330

	if (rc) {
		cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
3331
		cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
3332 3333 3334 3335
	}

	return rc;
}
3336 3337 3338 3339 3340 3341 3342 3343

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);
3344 3345
	kst->f_bfree  = kst->f_bavail =
			le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
3346 3347 3348 3349 3350 3351 3352 3353 3354 3355
	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;

3356
	cifs_dbg(FYI, "Query FSInfo level %d\n", level);
3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386

	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;
3387
	struct kvec rsp_iov;
3388 3389 3390 3391
	int rc = 0;
	int resp_buftype;
	struct cifs_ses *ses = tcon->ses;
	struct smb2_fs_full_size_info *info = NULL;
3392
	int flags = 0;
3393 3394 3395 3396 3397 3398 3399

	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;

3400 3401 3402 3403
	if (encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

	rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, flags, &rsp_iov);
3404
	cifs_small_buf_release(iov.iov_base);
3405 3406
	if (rc) {
		cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3407
		goto qfsinf_exit;
3408
	}
3409
	rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3410 3411 3412 3413 3414 3415 3416 3417 3418

	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);

3419
qfsinf_exit:
3420
	free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3421 3422 3423 3424 3425
	return rc;
}

int
SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
3426
	      u64 persistent_fid, u64 volatile_fid, int level)
3427 3428 3429
{
	struct smb2_query_info_rsp *rsp = NULL;
	struct kvec iov;
3430
	struct kvec rsp_iov;
3431
	int rc = 0;
3432
	int resp_buftype, max_len, min_len;
3433 3434
	struct cifs_ses *ses = tcon->ses;
	unsigned int rsp_len, offset;
3435
	int flags = 0;
3436

3437 3438 3439 3440 3441 3442
	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
3443 3444 3445
	} else if (level == FS_SECTOR_SIZE_INFORMATION) {
		max_len = sizeof(struct smb3_fs_ss_info);
		min_len = sizeof(struct smb3_fs_ss_info);
3446
	} else {
S
Steven French 已提交
3447
		cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
3448 3449 3450 3451
		return -EINVAL;
	}

	rc = build_qfs_info_req(&iov, tcon, level, max_len,
3452 3453 3454 3455
				persistent_fid, volatile_fid);
	if (rc)
		return rc;

3456 3457 3458 3459
	if (encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

	rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, flags, &rsp_iov);
3460
	cifs_small_buf_release(iov.iov_base);
3461 3462 3463 3464
	if (rc) {
		cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
		goto qfsattr_exit;
	}
3465
	rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3466 3467 3468

	rsp_len = le32_to_cpu(rsp->OutputBufferLength);
	offset = le16_to_cpu(rsp->OutputBufferOffset);
3469 3470 3471 3472 3473
	rc = validate_buf(offset, rsp_len, &rsp->hdr, min_len);
	if (rc)
		goto qfsattr_exit;

	if (level == FS_ATTRIBUTE_INFORMATION)
3474 3475
		memcpy(&tcon->fsAttrInfo, 4 /* RFC1001 len */ + offset
			+ (char *)&rsp->hdr, min_t(unsigned int,
3476 3477 3478 3479
			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
3480 3481 3482 3483 3484 3485 3486
	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);
	}
3487 3488

qfsattr_exit:
3489
	free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3490 3491
	return rc;
}
3492 3493 3494 3495 3496 3497 3498 3499 3500

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];
3501
	struct kvec rsp_iov;
3502 3503
	int resp_buf_type;
	unsigned int count;
3504
	int flags = CIFS_NO_RESP;
3505

3506
	cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
3507 3508 3509 3510 3511

	rc = small_smb2_init(SMB2_LOCK, tcon, (void **) &req);
	if (rc)
		return rc;

3512 3513 3514
	if (encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

3515
	req->hdr.sync_hdr.ProcessId = cpu_to_le32(pid);
3516 3517 3518 3519 3520 3521 3522 3523 3524 3525 3526 3527 3528 3529 3530
	req->LockCount = cpu_to_le16(num_lock);

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

	count = num_lock * sizeof(struct smb2_lock_element);
	inc_rfc1001_len(req, count - sizeof(struct smb2_lock_element));

	iov[0].iov_base = (char *)req;
	/* 4 for rfc1002 length field and count for all locks */
	iov[0].iov_len = get_rfc1002_length(req) + 4 - count;
	iov[1].iov_base = (char *)buf;
	iov[1].iov_len = count;

	cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
3531
	rc = SendReceive2(xid, tcon->ses, iov, 2, &resp_buf_type, flags,
3532 3533
			  &rsp_iov);
	cifs_small_buf_release(req);
3534
	if (rc) {
3535
		cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
3536 3537 3538 3539 3540 3541 3542 3543 3544 3545 3546 3547 3548 3549 3550 3551 3552 3553 3554 3555 3556 3557
		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);
}
3558 3559 3560 3561 3562 3563 3564

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;
3565
	int flags = CIFS_OBREAK_OP;
3566

3567
	cifs_dbg(FYI, "SMB2_lease_break\n");
3568 3569 3570 3571
	rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
	if (rc)
		return rc;

3572 3573 3574
	if (encryption_required(tcon))
		flags |= CIFS_TRANSFORM_REQ;

3575
	req->hdr.sync_hdr.CreditRequest = cpu_to_le16(1);
3576 3577 3578 3579 3580 3581
	req->StructureSize = cpu_to_le16(36);
	inc_rfc1001_len(req, 12);

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

3582
	rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, flags);
3583
	cifs_small_buf_release(req);
3584 3585 3586

	if (rc) {
		cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
3587
		cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
3588 3589 3590 3591
	}

	return rc;
}