smb2pdu.c 72.8 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/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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/*
 *  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 */
};


static void
smb2_hdr_assemble(struct smb2_hdr *hdr, __le16 smb2_cmd /* command */ ,
		  const struct cifs_tcon *tcon)
{
	struct smb2_pdu *pdu = (struct smb2_pdu *)hdr;
	char *temp = (char *)hdr;
	/* lookup word count ie StructureSize from table */
	__u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_cmd)];

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

	/* Note this is only network field converted to big endian */
	hdr->smb2_buf_length = cpu_to_be32(parmsize + sizeof(struct smb2_hdr)
			- 4 /*  RFC 1001 length field itself not counted */);

	hdr->ProtocolId[0] = 0xFE;
	hdr->ProtocolId[1] = 'S';
	hdr->ProtocolId[2] = 'M';
	hdr->ProtocolId[3] = 'B';
	hdr->StructureSize = cpu_to_le16(64);
	hdr->Command = smb2_cmd;
	hdr->CreditRequest = cpu_to_le16(2); /* BB make this dynamic */
	hdr->ProcessId = cpu_to_le32((__u16)current->tgid);

	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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		hdr->CreditCharge = cpu_to_le16(1);
	/* else CreditCharge MBZ */

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	hdr->TreeId = tcon->tid;
	/* Uid is not converted */
	if (tcon->ses)
		hdr->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)
		hdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */

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	if (tcon->ses && tcon->ses->server && tcon->ses->server->sign)
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		hdr->Flags |= SMB2_FLAGS_SIGNED;
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out:
	pdu->StructureSize2 = cpu_to_le16(parmsize);
	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);
	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);
	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;
	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:
		return -EAGAIN;
	}
	unload_nls(nls_codepage);
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	return rc;
}

/*
 * 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
 * function must have filled in request_buf pointer.
 */
static int
small_smb2_init(__le16 smb2_command, struct cifs_tcon *tcon,
		void **request_buf)
{
	int rc = 0;

	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;
	}

	smb2_hdr_assemble((struct smb2_hdr *) *request_buf, smb2_command, tcon);

	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;
}

/*
 *
 *	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];
	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;

	req->hdr.SessionId = 0;

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	req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
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	req->DialectCount = cpu_to_le16(1); /* One vers= at a time for now */
	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);
	else
		memcpy(req->ClientGUID, server->client_guid,
			SMB2_CLIENT_GUID_SIZE);
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	iov[0].iov_base = (char *)req;
	/* 4 for rfc1002 length field */
	iov[0].iov_len = get_rfc1002_length(req) + 4;

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

	rsp = (struct smb2_negotiate_rsp *)iov[0].iov_base;
	/*
	 * No tcon so can't do
	 * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
	 */
	if (rc != 0)
		goto neg_exit;

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	cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
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	/* BB we may eventually want to match the negotiated vs. requested
	   dialect, even though we are only requesting one at a time */
	if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
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		cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
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	else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
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		cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
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	else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
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		cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
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	else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
		cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
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#ifdef CONFIG_CIFS_SMB311
	else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
		cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
#endif /* SMB311 */
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	else {
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		cifs_dbg(VFS, "Illegal dialect returned by server %d\n",
			 le16_to_cpu(rsp->DialectRevision));
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		rc = -EIO;
		goto neg_exit;
	}
	server->dialect = le16_to_cpu(rsp->DialectRevision);

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	/* SMB2 only has an extended negflavor */
	server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
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	/* 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);
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	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);
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	/* Internal types */
	server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
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	security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
					       &rsp->hdr);
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	/*
	 * 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.
	 */
	if (blob_length == 0)
		cifs_dbg(FYI, "missing security blob on negprot\n");
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	rc = cifs_enable_signing(server, ses->sign);
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#ifdef CONFIG_SMB2_ASN1  /* BB REMOVEME when updated asn1.c ready */
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	if (rc)
		goto neg_exit;
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	if (blob_length)
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		rc = decode_negTokenInit(security_blob, blob_length, server);
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	if (rc == 1)
		rc = 0;
	else if (rc == 0) {
		rc = -EIO;
		goto neg_exit;
	}
#endif

neg_exit:
	free_rsp_buf(resp_buftype, rsp);
	return rc;
}
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int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
{
	int rc = 0;
	struct validate_negotiate_info_req vneg_inbuf;
	struct validate_negotiate_info_rsp *pneg_rsp;
	u32 rsplen;

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

	/*
	 * validation ioctl must be signed, so no point sending this if we
	 * can not sign it.  We could eventually change this to selectively
	 * sign just this, the first and only signed request on a connection.
	 * This is good enough for now since a user who wants better security
	 * would also enable signing on the mount. Having validation of
	 * negotiate info for signed connections helps reduce attack vectors
	 */
	if (tcon->ses->server->sign == false)
		return 0; /* validation requires signing */

	vneg_inbuf.Capabilities =
			cpu_to_le32(tcon->ses->server->vals->req_capabilities);
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	memcpy(vneg_inbuf.Guid, tcon->ses->server->client_guid,
					SMB2_CLIENT_GUID_SIZE);
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	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;

	vneg_inbuf.DialectCount = cpu_to_le16(1);
	vneg_inbuf.Dialects[0] =
		cpu_to_le16(tcon->ses->server->vals->protocol_id);

	rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
		FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
		(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)) {
		cifs_dbg(VFS, "invalid size of protocol negotiate response\n");
		return -EIO;
	}

	/* 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");
	return 0;

vneg_out:
	cifs_dbg(VFS, "protocol revalidation - security settings mismatch\n");
	return -EIO;
}

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int
SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
		const struct nls_table *nls_cp)
{
	struct smb2_sess_setup_req *req;
	struct smb2_sess_setup_rsp *rsp = NULL;
	struct kvec iov[2];
	int rc = 0;
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	int resp_buftype = CIFS_NO_BUFFER;
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	__le32 phase = NtLmNegotiate; /* NTLMSSP, if needed, is multistage */
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	struct TCP_Server_Info *server = ses->server;
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	u16 blob_length = 0;
	char *security_blob;
	char *ntlmssp_blob = NULL;
	bool use_spnego = false; /* else use raw ntlmssp */

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

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	/*
	 * If we are here due to reconnect, free per-smb session key
	 * in case signing was required.
	 */
	kfree(ses->auth_key.response);
	ses->auth_key.response = NULL;

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	/*
	 * If memory allocation is successful, caller of this function
	 * frees it.
	 */
	ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
	if (!ses->ntlmssp)
		return -ENOMEM;
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	ses->ntlmssp->sesskey_per_smbsess = true;
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	/* FIXME: allow for other auth types besides NTLMSSP (e.g. krb5) */
	ses->sectype = RawNTLMSSP;
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ssetup_ntlmssp_authenticate:
	if (phase == NtLmChallenge)
		phase = NtLmAuthenticate; /* if ntlmssp, now final phase */

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

	req->hdr.SessionId = 0; /* First session, not a reauthenticate */
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	req->Flags = 0; /* MBZ */
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	/* to enable echos and oplocks */
	req->hdr.CreditRequest = cpu_to_le16(3);

	/* only one of SMB2 signing flags may be set in SMB2 request */
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	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;

591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610
	req->Capabilities = 0;
	req->Channel = 0; /* MBZ */

	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;
	if (phase == NtLmNegotiate) {
		ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
				       GFP_KERNEL);
		if (ntlmssp_blob == NULL) {
			rc = -ENOMEM;
			goto ssetup_exit;
		}
		build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
		if (use_spnego) {
			/* blob_length = build_spnego_ntlmssp_blob(
					&security_blob,
					sizeof(struct _NEGOTIATE_MESSAGE),
					ntlmssp_blob); */
			/* BB eventually need to add this */
611
			cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630
			rc = -EOPNOTSUPP;
			kfree(ntlmssp_blob);
			goto ssetup_exit;
		} else {
			blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
			/* with raw NTLMSSP we don't encapsulate in SPNEGO */
			security_blob = ntlmssp_blob;
		}
	} else if (phase == NtLmAuthenticate) {
		req->hdr.SessionId = ses->Suid;
		ntlmssp_blob = kzalloc(sizeof(struct _NEGOTIATE_MESSAGE) + 500,
				       GFP_KERNEL);
		if (ntlmssp_blob == NULL) {
			rc = -ENOMEM;
			goto ssetup_exit;
		}
		rc = build_ntlmssp_auth_blob(ntlmssp_blob, &blob_length, ses,
					     nls_cp);
		if (rc) {
631 632
			cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n",
				 rc);
633 634 635 636 637 638 639
			goto ssetup_exit; /* BB double check error handling */
		}
		if (use_spnego) {
			/* blob_length = build_spnego_ntlmssp_blob(
							&security_blob,
							blob_length,
							ntlmssp_blob); */
640
			cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
641 642 643 644 645 646 647
			rc = -EOPNOTSUPP;
			kfree(ntlmssp_blob);
			goto ssetup_exit;
		} else {
			security_blob = ntlmssp_blob;
		}
	} else {
648
		cifs_dbg(VFS, "illegal ntlmssp phase\n");
649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664
		rc = -EIO;
		goto ssetup_exit;
	}

	/* 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(blob_length);
	iov[1].iov_base = security_blob;
	iov[1].iov_len = blob_length;

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

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

665 666
	rc = SendReceive2(xid, ses, iov, 2, &resp_buftype,
			  CIFS_LOG_ERROR | CIFS_NEG_OP);
667 668 669

	kfree(security_blob);
	rsp = (struct smb2_sess_setup_rsp *)iov[0].iov_base;
670 671
	if (resp_buftype != CIFS_NO_BUFFER &&
	    rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED) {
672
		if (phase != NtLmNegotiate) {
673
			cifs_dbg(VFS, "Unexpected more processing error\n");
674 675 676
			goto ssetup_exit;
		}
		if (offsetof(struct smb2_sess_setup_rsp, Buffer) - 4 !=
677
				le16_to_cpu(rsp->SecurityBufferOffset)) {
678 679
			cifs_dbg(VFS, "Invalid security buffer offset %d\n",
				 le16_to_cpu(rsp->SecurityBufferOffset));
680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703
			rc = -EIO;
			goto ssetup_exit;
		}

		/* NTLMSSP Negotiate sent now processing challenge (response) */
		phase = NtLmChallenge; /* process ntlmssp challenge */
		rc = 0; /* MORE_PROCESSING is not an error here but expected */
		ses->Suid = rsp->hdr.SessionId;
		rc = decode_ntlmssp_challenge(rsp->Buffer,
				le16_to_cpu(rsp->SecurityBufferLength), ses);
	}

	/*
	 * BB eventually add code for SPNEGO decoding of NtlmChallenge blob,
	 * but at least the raw NTLMSSP case works.
	 */
	/*
	 * No tcon so can't do
	 * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
	 */
	if (rc != 0)
		goto ssetup_exit;

	ses->session_flags = le16_to_cpu(rsp->SessionFlags);
704 705
	if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
		cifs_dbg(VFS, "SMB3 encryption not supported yet\n");
706 707 708 709 710 711
ssetup_exit:
	free_rsp_buf(resp_buftype, rsp);

	/* if ntlmssp, and negotiate succeeded, proceed to authenticate phase */
	if ((phase == NtLmChallenge) && (rc == 0))
		goto ssetup_ntlmssp_authenticate;
712 713 714

	if (!rc) {
		mutex_lock(&server->srv_mutex);
715 716 717 718 719 720 721 722 723 724 725
		if (server->sign && server->ops->generate_signingkey) {
			rc = server->ops->generate_signingkey(ses);
			kfree(ses->auth_key.response);
			ses->auth_key.response = NULL;
			if (rc) {
				cifs_dbg(FYI,
					"SMB3 session key generation failed\n");
				mutex_unlock(&server->srv_mutex);
				goto keygen_exit;
			}
		}
726 727 728 729 730 731 732 733 734 735 736 737 738
		if (!server->session_estab) {
			server->sequence_number = 0x2;
			server->session_estab = true;
		}
		mutex_unlock(&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);
	}

739
keygen_exit:
740 741 742 743 744 745
	if (!server->sign) {
		kfree(ses->auth_key.response);
		ses->auth_key.response = NULL;
	}
	kfree(ses->ntlmssp);

746 747 748 749 750 751 752 753 754 755
	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;

756
	cifs_dbg(FYI, "disconnect session %p\n", ses);
757 758 759 760 761 762

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

763 764 765 766
	/* no need to send SMB logoff if uid already closed due to reconnect */
	if (ses->need_reconnect)
		goto smb2_session_already_dead;

767 768 769 770 771 772
	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 */
	req->hdr.SessionId = ses->Suid;
773
	if (server->sign)
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Pavel Shilovsky 已提交
774
		req->hdr.Flags |= SMB2_FLAGS_SIGNED;
775 776 777 778 779 780

	rc = SendReceiveNoRsp(xid, ses, (char *) &req->hdr, 0);
	/*
	 * No tcon so can't do
	 * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
	 */
781 782

smb2_session_already_dead:
783 784
	return rc;
}
785 786 787

static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
{
788
	cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
789 790 791 792
}

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

S
Steve French 已提交
793 794 795 796 797 798 799 800
/* 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;
}

801 802 803 804 805 806 807 808 809 810 811 812 813
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];
	int rc = 0;
	int resp_buftype;
	int unc_path_len;
	struct TCP_Server_Info *server;
	__le16 *unc_path = NULL;

814
	cifs_dbg(FYI, "TCON\n");
815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877

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

	if (tcon && tcon->bad_network_name)
		return -ENOENT;

	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;
	}

	rc = small_smb2_init(SMB2_TREE_CONNECT, tcon, (void **) &req);
	if (rc) {
		kfree(unc_path);
		return rc;
	}

	if (tcon == NULL) {
		/* since no tcon, smb2_init can not do this, so do here */
		req->hdr.SessionId = ses->Suid;
		/* if (ses->server->sec_mode & SECMODE_SIGN_REQUIRED)
			req->hdr.Flags |= SMB2_FLAGS_SIGNED; */
	}

	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 */);

	rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
	rsp = (struct smb2_tree_connect_rsp *)iov[0].iov_base;

	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) {
		ses->ipc_tid = rsp->hdr.TreeId;
		goto tcon_exit;
	}

	if (rsp->ShareType & SMB2_SHARE_TYPE_DISK)
878
		cifs_dbg(FYI, "connection to disk share\n");
879 880
	else if (rsp->ShareType & SMB2_SHARE_TYPE_PIPE) {
		tcon->ipc = true;
881
		cifs_dbg(FYI, "connection to pipe share\n");
882 883
	} else if (rsp->ShareType & SMB2_SHARE_TYPE_PRINT) {
		tcon->print = true;
884
		cifs_dbg(FYI, "connection to printer\n");
885
	} else {
886
		cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
887 888 889 890 891
		rc = -EOPNOTSUPP;
		goto tcon_error_exit;
	}

	tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
892
	tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
893 894 895 896
	tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
	tcon->tidStatus = CifsGood;
	tcon->need_reconnect = false;
	tcon->tid = rsp->hdr.TreeId;
897
	strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
898 899 900

	if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
	    ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
901
		cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
S
Steve French 已提交
902
	init_copy_chunk_defaults(tcon);
903 904
	if (tcon->ses->server->ops->validate_negotiate)
		rc = tcon->ses->server->ops->validate_negotiate(xid, tcon);
905 906 907 908 909 910 911
tcon_exit:
	free_rsp_buf(resp_buftype, rsp);
	kfree(unc_path);
	return rc;

tcon_error_exit:
	if (rsp->hdr.Status == STATUS_BAD_NETWORK_NAME) {
912
		cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
913 914
		if (tcon)
			tcon->bad_network_name = true;
915 916 917 918 919 920 921 922 923 924 925 926
	}
	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 TCP_Server_Info *server;
	struct cifs_ses *ses = tcon->ses;

927
	cifs_dbg(FYI, "Tree Disconnect\n");
928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946

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

	rc = SendReceiveNoRsp(xid, ses, (char *)&req->hdr, 0);
	if (rc)
		cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);

	return rc;
}
947

P
Pavel Shilovsky 已提交
948

949 950 951 952 953 954 955 956 957 958
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
959
					(struct create_durable, Data));
960 961 962 963
	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);
964
	/* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
965 966 967 968 969 970 971
	buf->Name[0] = 'D';
	buf->Name[1] = 'H';
	buf->Name[2] = 'n';
	buf->Name[3] = 'Q';
	return buf;
}

972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988
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;
989
	/* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
990 991 992 993 994 995 996
	buf->Name[0] = 'D';
	buf->Name[1] = 'H';
	buf->Name[2] = 'n';
	buf->Name[3] = 'C';
	return buf;
}

P
Pavel Shilovsky 已提交
997
static __u8
998 999
parse_lease_state(struct TCP_Server_Info *server, struct smb2_create_rsp *rsp,
		  unsigned int *epoch)
P
Pavel Shilovsky 已提交
1000 1001
{
	char *data_offset;
1002
	struct create_context *cc;
1003 1004
	unsigned int next = 0;
	char *name;
P
Pavel Shilovsky 已提交
1005

1006
	data_offset = (char *)rsp + 4 + le32_to_cpu(rsp->CreateContextsOffset);
1007
	cc = (struct create_context *)data_offset;
P
Pavel Shilovsky 已提交
1008
	do {
1009 1010 1011
		cc = (struct create_context *)((char *)cc + next);
		name = le16_to_cpu(cc->NameOffset) + (char *)cc;
		if (le16_to_cpu(cc->NameLength) != 4 ||
P
Pavel Shilovsky 已提交
1012
		    strncmp(name, "RqLs", 4)) {
1013
			next = le32_to_cpu(cc->Next);
P
Pavel Shilovsky 已提交
1014 1015
			continue;
		}
1016
		return server->ops->parse_lease_buf(cc, epoch);
1017
	} while (next != 0);
P
Pavel Shilovsky 已提交
1018

1019
	return 0;
P
Pavel Shilovsky 已提交
1020 1021
}

1022
static int
1023 1024
add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
		  unsigned int *num_iovec, __u8 *oplock)
1025 1026 1027 1028
{
	struct smb2_create_req *req = iov[0].iov_base;
	unsigned int num = *num_iovec;

1029
	iov[num].iov_base = server->ops->create_lease_buf(oplock+1, *oplock);
1030 1031
	if (iov[num].iov_base == NULL)
		return -ENOMEM;
1032
	iov[num].iov_len = server->vals->create_lease_size;
1033 1034 1035 1036 1037
	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);
1038 1039 1040
	le32_add_cpu(&req->CreateContextsLength,
		     server->vals->create_lease_size);
	inc_rfc1001_len(&req->hdr, server->vals->create_lease_size);
1041 1042 1043 1044
	*num_iovec = num + 1;
	return 0;
}

1045
static int
1046 1047
add_durable_context(struct kvec *iov, unsigned int *num_iovec,
		    struct cifs_open_parms *oparms)
1048 1049 1050 1051
{
	struct smb2_create_req *req = iov[0].iov_base;
	unsigned int num = *num_iovec;

1052 1053 1054 1055 1056 1057
	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();
1058 1059 1060 1061 1062 1063 1064
	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);
1065
	le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
1066 1067 1068 1069 1070
	inc_rfc1001_len(&req->hdr, sizeof(struct create_durable));
	*num_iovec = num + 1;
	return 0;
}

1071
int
1072
SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
1073 1074
	  __u8 *oplock, struct smb2_file_all_info *buf,
	  struct smb2_err_rsp **err_buf)
1075 1076 1077 1078
{
	struct smb2_create_req *req;
	struct smb2_create_rsp *rsp;
	struct TCP_Server_Info *server;
1079
	struct cifs_tcon *tcon = oparms->tcon;
1080
	struct cifs_ses *ses = tcon->ses;
1081
	struct kvec iov[4];
1082 1083
	int resp_buftype;
	int uni_path_len;
P
Pavel Shilovsky 已提交
1084 1085
	__le16 *copy_path = NULL;
	int copy_size;
1086
	int rc = 0;
1087
	unsigned int num_iovecs = 2;
1088
	__u32 file_attributes = 0;
1089
	char *dhc_buf = NULL, *lc_buf = NULL;
1090

1091
	cifs_dbg(FYI, "create/open\n");
1092 1093 1094 1095 1096 1097 1098 1099 1100 1101

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

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

1102
	if (oparms->create_options & CREATE_OPTION_READONLY)
1103
		file_attributes |= ATTR_READONLY;
1104 1105
	if (oparms->create_options & CREATE_OPTION_SPECIAL)
		file_attributes |= ATTR_SYSTEM;
1106

1107
	req->ImpersonationLevel = IL_IMPERSONATION;
1108
	req->DesiredAccess = cpu_to_le32(oparms->desired_access);
1109 1110 1111
	/* File attributes ignored on open (used in create though) */
	req->FileAttributes = cpu_to_le32(file_attributes);
	req->ShareAccess = FILE_SHARE_ALL_LE;
1112 1113
	req->CreateDisposition = cpu_to_le32(oparms->disposition);
	req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
1114
	uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
1115 1116
	/* do not count rfc1001 len field */
	req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req) - 4);
1117 1118 1119 1120 1121 1122

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

	/* MUST set path len (NameLength) to 0 opening root of share */
1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137
	req->NameLength = cpu_to_le16(uni_path_len - 2);
	/* -1 since last byte is buf[0] which is sent below (path) */
	iov[0].iov_len--;
	if (uni_path_len % 8 != 0) {
		copy_size = uni_path_len / 8 * 8;
		if (copy_size < uni_path_len)
			copy_size += 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;
1138 1139
	}

1140 1141 1142 1143 1144
	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);

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1145 1146 1147
	if (!server->oplocks)
		*oplock = SMB2_OPLOCK_LEVEL_NONE;

1148
	if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
P
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1149 1150 1151
	    *oplock == SMB2_OPLOCK_LEVEL_NONE)
		req->RequestedOplockLevel = *oplock;
	else {
1152
		rc = add_lease_context(server, iov, &num_iovecs, oplock);
1153
		if (rc) {
P
Pavel Shilovsky 已提交
1154 1155
			cifs_small_buf_release(req);
			kfree(copy_path);
1156
			return rc;
P
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1157
		}
1158
		lc_buf = iov[num_iovecs-1].iov_base;
P
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1159 1160
	}

1161 1162
	if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
		/* need to set Next field of lease context if we request it */
1163
		if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
1164 1165
			struct create_context *ccontext =
			    (struct create_context *)iov[num_iovecs-1].iov_base;
1166
			ccontext->Next =
1167
				cpu_to_le32(server->vals->create_lease_size);
1168
		}
1169
		rc = add_durable_context(iov, &num_iovecs, oparms);
1170 1171 1172
		if (rc) {
			cifs_small_buf_release(req);
			kfree(copy_path);
1173
			kfree(lc_buf);
1174 1175
			return rc;
		}
1176
		dhc_buf = iov[num_iovecs-1].iov_base;
1177 1178
	}

1179 1180 1181 1182 1183
	rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
	rsp = (struct smb2_create_rsp *)iov[0].iov_base;

	if (rc != 0) {
		cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
1184 1185 1186
		if (err_buf)
			*err_buf = kmemdup(rsp, get_rfc1002_length(rsp) + 4,
					   GFP_KERNEL);
1187 1188 1189
		goto creat_exit;
	}

1190 1191
	oparms->fid->persistent_fid = rsp->PersistentFileId;
	oparms->fid->volatile_fid = rsp->VolatileFileId;
1192 1193 1194 1195 1196 1197 1198 1199 1200

	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;
	}
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1201

P
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1202
	if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
1203
		*oplock = parse_lease_state(server, rsp, &oparms->fid->epoch);
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1204 1205
	else
		*oplock = rsp->OplockLevel;
1206
creat_exit:
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1207
	kfree(copy_path);
1208 1209
	kfree(lc_buf);
	kfree(dhc_buf);
1210 1211 1212 1213
	free_rsp_buf(resp_buftype, rsp);
	return rc;
}

1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224
/*
 *	SMB2 IOCTL is used for both IOCTLs and FSCTLs
 */
int
SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
	   u64 volatile_fid, u32 opcode, bool is_fsctl, char *in_data,
	   u32 indatalen, char **out_data, u32 *plen /* returned data len */)
{
	struct smb2_ioctl_req *req;
	struct smb2_ioctl_rsp *rsp;
	struct TCP_Server_Info *server;
1225
	struct cifs_ses *ses;
1226 1227 1228 1229 1230 1231 1232
	struct kvec iov[2];
	int resp_buftype;
	int num_iovecs;
	int rc = 0;

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

1233 1234 1235
	if (out_data != NULL)
		*out_data = NULL;

1236 1237 1238 1239
	/* zero out returned data len, in case of error */
	if (plen)
		*plen = 0;

1240 1241 1242 1243 1244
	if (tcon)
		ses = tcon->ses;
	else
		return -EIO;

1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286
	if (ses && (ses->server))
		server = ses->server;
	else
		return -EIO;

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

	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;
		num_iovecs = 2;
	} else
		num_iovecs = 1;

	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
	 */
	req->MaxOutputResponse = cpu_to_le32(0xFF00); /* < 64K uses 1 credit */

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

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

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1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302
	/*
	 * 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;

1303 1304 1305 1306

	rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
	rsp = (struct smb2_ioctl_rsp *)iov[0].iov_base;

1307
	if ((rc != 0) && (rc != -EINVAL)) {
1308
		cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1309
		goto ioctl_exit;
1310 1311 1312
	} else if (rc == -EINVAL) {
		if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
		    (opcode != FSCTL_SRV_COPYCHUNK)) {
1313
			cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1314 1315
			goto ioctl_exit;
		}
1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354
	}

	/* 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;
	}

	memcpy(*out_data, rsp->hdr.ProtocolId + le32_to_cpu(rsp->OutputOffset),
	       *plen);
ioctl_exit:
	free_rsp_buf(resp_buftype, rsp);
	return rc;
}

1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367
/*
 *   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 =
1368
			cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379

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

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

	return rc;
}

1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391
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 TCP_Server_Info *server;
	struct cifs_ses *ses = tcon->ses;
	struct kvec iov[1];
	int resp_buftype;
	int rc = 0;

1392
	cifs_dbg(FYI, "Close\n");
1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413

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

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

	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;

	rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
	rsp = (struct smb2_close_rsp *)iov[0].iov_base;

	if (rc != 0) {
1414
		cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
1415 1416 1417 1418 1419 1420 1421 1422 1423
		goto close_exit;
	}

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

close_exit:
	free_rsp_buf(resp_buftype, rsp);
	return rc;
}
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1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436

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) {
1437 1438
		cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
			 buffer_length, min_buf_size);
P
Pavel Shilovsky 已提交
1439 1440 1441 1442 1443
		return -EINVAL;
	}

	/* check if beyond RFC1001 maximum length */
	if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
1444 1445
		cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
			 buffer_length, smb_len);
P
Pavel Shilovsky 已提交
1446 1447 1448 1449
		return -EINVAL;
	}

	if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
1450
		cifs_dbg(VFS, "illegal server response, bad offset to data\n");
P
Pavel Shilovsky 已提交
1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481
		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;
}

1482 1483 1484 1485
static int
query_info(const unsigned int xid, struct cifs_tcon *tcon,
	   u64 persistent_fid, u64 volatile_fid, u8 info_class,
	   size_t output_len, size_t min_len, void *data)
P
Pavel Shilovsky 已提交
1486 1487 1488 1489 1490 1491 1492 1493 1494
{
	struct smb2_query_info_req *req;
	struct smb2_query_info_rsp *rsp = NULL;
	struct kvec iov[2];
	int rc = 0;
	int resp_buftype;
	struct TCP_Server_Info *server;
	struct cifs_ses *ses = tcon->ses;

1495
	cifs_dbg(FYI, "Query Info\n");
P
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1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506

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

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

	req->InfoType = SMB2_O_INFO_FILE;
1507
	req->FileInfoClass = info_class;
P
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1508 1509 1510 1511 1512
	req->PersistentFileId = persistent_fid;
	req->VolatileFileId = volatile_fid;
	/* 4 for rfc1002 length field and 1 for Buffer */
	req->InputBufferOffset =
		cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
1513
	req->OutputBufferLength = cpu_to_le32(output_len);
P
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1514 1515 1516 1517 1518 1519

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

	rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1520 1521
	rsp = (struct smb2_query_info_rsp *)iov[0].iov_base;

P
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1522 1523 1524 1525 1526 1527 1528
	if (rc) {
		cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
		goto qinf_exit;
	}

	rc = validate_and_copy_buf(le16_to_cpu(rsp->OutputBufferOffset),
				   le32_to_cpu(rsp->OutputBufferLength),
1529
				   &rsp->hdr, min_len, data);
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Pavel Shilovsky 已提交
1530 1531 1532 1533 1534

qinf_exit:
	free_rsp_buf(resp_buftype, rsp);
	return rc;
}
1535

1536 1537 1538 1539 1540 1541 1542
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,
1543
			  sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556
			  sizeof(struct smb2_file_all_info), data);
}

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,
			  FILE_INTERNAL_INFORMATION,
			  sizeof(struct smb2_file_internal_info),
			  sizeof(struct smb2_file_internal_info), uniqueid);
}

1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583
/*
 * 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;
	struct smb2_echo_rsp *smb2 = (struct smb2_echo_rsp *)mid->resp_buf;
	unsigned int credits_received = 1;

	if (mid->mid_state == MID_RESPONSE_RECEIVED)
		credits_received = le16_to_cpu(smb2->hdr.CreditRequest);

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

int
SMB2_echo(struct TCP_Server_Info *server)
{
	struct smb2_echo_req *req;
	int rc = 0;
	struct kvec iov;
1584 1585
	struct smb_rqst rqst = { .rq_iov = &iov,
				 .rq_nvec = 1 };
1586

1587
	cifs_dbg(FYI, "In echo request\n");
1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598

	rc = small_smb2_init(SMB2_ECHO, NULL, (void **)&req);
	if (rc)
		return rc;

	req->hdr.CreditRequest = cpu_to_le16(1);

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

1599
	rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, server,
1600 1601
			     CIFS_ECHO_OP);
	if (rc)
1602
		cifs_dbg(FYI, "Echo request failed: %d\n", rc);
1603 1604 1605 1606

	cifs_small_buf_release(req);
	return rc;
}
1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618

int
SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
	   u64 volatile_fid)
{
	struct smb2_flush_req *req;
	struct TCP_Server_Info *server;
	struct cifs_ses *ses = tcon->ses;
	struct kvec iov[1];
	int resp_buftype;
	int rc = 0;

1619
	cifs_dbg(FYI, "Flush\n");
1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638

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

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

	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;

	rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);

1639
	if (rc != 0)
1640 1641 1642 1643 1644
		cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);

	free_rsp_buf(resp_buftype, iov[0].iov_base);
	return rc;
}
1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709

/*
 * 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
smb2_new_read_req(struct kvec *iov, struct cifs_io_parms *io_parms,
		  unsigned int remaining_bytes, int request_type)
{
	int rc = -EACCES;
	struct smb2_read_req *req = NULL;

	rc = small_smb2_init(SMB2_READ, io_parms->tcon, (void **) &req);
	if (rc)
		return rc;
	if (io_parms->tcon->ses->server == NULL)
		return -ECONNABORTED;

	req->hdr.ProcessId = cpu_to_le32(io_parms->pid);

	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)) {
			/* 4 for rfc1002 length field */
			req->hdr.NextCommand =
				cpu_to_le32(get_rfc1002_length(req) + 4);
		} else /* END_OF_CHAIN */
			req->hdr.NextCommand = 0;
		if (request_type & RELATED_REQUEST) {
			req->hdr.Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
			/*
			 * Related requests use info from previous read request
			 * in chain.
			 */
			req->hdr.SessionId = 0xFFFFFFFF;
			req->hdr.TreeId = 0xFFFFFFFF;
			req->PersistentFileId = 0xFFFFFFFF;
			req->VolatileFileId = 0xFFFFFFFF;
		}
	}
	if (remaining_bytes > io_parms->length)
		req->RemainingBytes = cpu_to_le32(remaining_bytes);
	else
		req->RemainingBytes = 0;

	iov[0].iov_base = (char *)req;
	/* 4 for rfc1002 length field */
	iov[0].iov_len = get_rfc1002_length(req) + 4;
	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;
1710
	struct smb2_hdr *buf = (struct smb2_hdr *)rdata->iov.iov_base;
1711
	unsigned int credits_received = 1;
1712
	struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1713 1714 1715 1716 1717
				 .rq_nvec = 1,
				 .rq_pages = rdata->pages,
				 .rq_npages = rdata->nr_pages,
				 .rq_pagesz = rdata->pagesz,
				 .rq_tailsz = rdata->tailsz };
1718

1719 1720 1721
	cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
		 __func__, mid->mid, mid->mid_state, rdata->result,
		 rdata->bytes);
1722 1723 1724 1725 1726

	switch (mid->mid_state) {
	case MID_RESPONSE_RECEIVED:
		credits_received = le16_to_cpu(buf->CreditRequest);
		/* result already set, check signature */
1727
		if (server->sign) {
P
Pavel Shilovsky 已提交
1728 1729
			int rc;

1730
			rc = smb2_verify_signature(&rqst, server);
P
Pavel Shilovsky 已提交
1731
			if (rc)
1732 1733
				cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
					 rc);
P
Pavel Shilovsky 已提交
1734
		}
1735
		/* FIXME: should this be counted toward the initiating task? */
1736 1737
		task_io_account_read(rdata->got_bytes);
		cifs_stats_bytes_read(tcon, rdata->got_bytes);
1738 1739 1740 1741
		break;
	case MID_REQUEST_SUBMITTED:
	case MID_RETRY_NEEDED:
		rdata->result = -EAGAIN;
1742 1743 1744 1745 1746 1747
		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);
1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765
		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);
}

/* smb2_async_readv - send an async write, and set up mid to handle result */
int
smb2_async_readv(struct cifs_readdata *rdata)
{
1766
	int rc, flags = 0;
1767 1768
	struct smb2_hdr *buf;
	struct cifs_io_parms io_parms;
1769
	struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1770
				 .rq_nvec = 1 };
1771
	struct TCP_Server_Info *server;
1772

1773 1774
	cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
		 __func__, rdata->offset, rdata->bytes);
1775 1776 1777 1778 1779 1780 1781

	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;
1782 1783 1784

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

1785
	rc = smb2_new_read_req(&rdata->iov, &io_parms, 0, 0);
1786 1787 1788 1789 1790 1791 1792 1793 1794
	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);
		}
1795
		return rc;
1796
	}
1797

1798
	buf = (struct smb2_hdr *)rdata->iov.iov_base;
1799
	/* 4 for rfc1002 length field */
1800
	rdata->iov.iov_len = get_rfc1002_length(rdata->iov.iov_base) + 4;
1801

1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812
	if (rdata->credits) {
		buf->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
						SMB2_MAX_BUFFER_SIZE));
		spin_lock(&server->req_lock);
		server->credits += rdata->credits -
						le16_to_cpu(buf->CreditCharge);
		spin_unlock(&server->req_lock);
		wake_up(&server->request_q);
		flags = CIFS_HAS_CREDITS;
	}

1813
	kref_get(&rdata->refcount);
1814
	rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
1815
			     cifs_readv_receive, smb2_readv_callback,
1816
			     rdata, flags);
1817
	if (rc) {
1818
		kref_put(&rdata->refcount, cifs_readdata_release);
1819 1820
		cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
	}
1821 1822 1823 1824

	cifs_small_buf_release(buf);
	return rc;
}
1825

1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850
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;
	struct smb2_read_rsp *rsp = NULL;
	struct kvec iov[1];

	*nbytes = 0;
	rc = smb2_new_read_req(iov, io_parms, 0, 0);
	if (rc)
		return rc;

	rc = SendReceive2(xid, io_parms->tcon->ses, iov, 1,
			  &resp_buftype, CIFS_LOG_ERROR);

	rsp = (struct smb2_read_rsp *)iov[0].iov_base;

	if (rsp->hdr.Status == STATUS_END_OF_FILE) {
		free_rsp_buf(resp_buftype, iov[0].iov_base);
		return 0;
	}

	if (rc) {
		cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
1851
		cifs_dbg(VFS, "Send error in read = %d\n", rc);
1852 1853 1854 1855
	} else {
		*nbytes = le32_to_cpu(rsp->DataLength);
		if ((*nbytes > CIFS_MAX_MSGSIZE) ||
		    (*nbytes > io_parms->length)) {
1856 1857
			cifs_dbg(FYI, "bad length %d for count %d\n",
				 *nbytes, io_parms->length);
1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876
			rc = -EIO;
			*nbytes = 0;
		}
	}

	if (*buf) {
		memcpy(*buf, (char *)rsp->hdr.ProtocolId + rsp->DataOffset,
		       *nbytes);
		free_rsp_buf(resp_buftype, iov[0].iov_base);
	} else if (resp_buftype != CIFS_NO_BUFFER) {
		*buf = iov[0].iov_base;
		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;
}

1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930
/*
 * 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:
		credits_received = le16_to_cpu(rsp->hdr.CreditRequest);
		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
1931 1932
smb2_async_writev(struct cifs_writedata *wdata,
		  void (*release)(struct kref *kref))
1933
{
1934
	int rc = -EACCES, flags = 0;
1935 1936
	struct smb2_write_req *req = NULL;
	struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1937
	struct TCP_Server_Info *server = tcon->ses->server;
1938
	struct kvec iov;
1939
	struct smb_rqst rqst;
1940 1941

	rc = small_smb2_init(SMB2_WRITE, tcon, (void **) &req);
1942 1943 1944 1945 1946 1947 1948 1949 1950
	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);
		}
1951
		goto async_writev_out;
1952
	}
1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967

	req->hdr.ProcessId = cpu_to_le32(wdata->cfile->pid);

	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 */
1968 1969
	iov.iov_len = get_rfc1002_length(req) + 4 - 1;
	iov.iov_base = req;
1970

1971 1972 1973 1974 1975 1976
	rqst.rq_iov = &iov;
	rqst.rq_nvec = 1;
	rqst.rq_pages = wdata->pages;
	rqst.rq_npages = wdata->nr_pages;
	rqst.rq_pagesz = wdata->pagesz;
	rqst.rq_tailsz = wdata->tailsz;
1977

1978 1979
	cifs_dbg(FYI, "async write at %llu %u bytes\n",
		 wdata->offset, wdata->bytes);
1980 1981 1982 1983 1984

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

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

1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995
	if (wdata->credits) {
		req->hdr.CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
						    SMB2_MAX_BUFFER_SIZE));
		spin_lock(&server->req_lock);
		server->credits += wdata->credits -
					le16_to_cpu(req->hdr.CreditCharge);
		spin_unlock(&server->req_lock);
		wake_up(&server->request_q);
		flags = CIFS_HAS_CREDITS;
	}

1996
	kref_get(&wdata->refcount);
1997 1998
	rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, wdata,
			     flags);
1999

2000
	if (rc) {
2001
		kref_put(&wdata->refcount, release);
2002 2003
		cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
	}
2004 2005 2006 2007 2008

async_writev_out:
	cifs_small_buf_release(req);
	return rc;
}
2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058

/*
 * 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;
	*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;

	req->hdr.ProcessId = cpu_to_le32(io_parms->pid);

	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,
			  &resp_buftype, 0);
2059
	rsp = (struct smb2_write_rsp *)iov[0].iov_base;
2060 2061 2062

	if (rc) {
		cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
2063
		cifs_dbg(VFS, "Send error in write = %d\n", rc);
2064
	} else
2065
		*nbytes = le32_to_cpu(rsp->DataLength);
2066 2067

	free_rsp_buf(resp_buftype, rsp);
2068 2069
	return rc;
}
2070

2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088
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) {
2089
			cifs_dbg(VFS, "malformed search entry would overflow\n");
2090 2091 2092 2093 2094
			break;
		}

		len = le32_to_cpu(entryptr->FileNameLength);
		if ((char *)entryptr + len + size > end_of_buf) {
2095 2096
			cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
				 end_of_buf);
2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123
			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];
	int rc = 0;
	int len;
2124
	int resp_buftype = CIFS_NO_BUFFER;
2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151
	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;

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

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

	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:
2152 2153
		cifs_dbg(VFS, "info level %u isn't supported\n",
			 srch_inf->info_level);
2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186
		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 */);

	rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
2187 2188
	rsp = (struct smb2_query_directory_rsp *)iov[0].iov_base;

2189
	if (rc) {
2190 2191 2192 2193
		if (rc == -ENODATA && rsp->hdr.Status == STATUS_NO_MORE_FILES) {
			srch_inf->endOfSearch = true;
			rc = 0;
		}
2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220
		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;
2221 2222 2223
	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);
2224 2225 2226 2227 2228
	if (resp_buftype == CIFS_LARGE_BUFFER)
		srch_inf->smallBuf = false;
	else if (resp_buftype == CIFS_SMALL_BUFFER)
		srch_inf->smallBuf = true;
	else
2229
		cifs_dbg(VFS, "illegal search buffer type\n");
2230 2231 2232 2233 2234 2235 2236 2237

	return rc;

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

2238 2239
static int
send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2240
	       u64 persistent_fid, u64 volatile_fid, u32 pid, int info_class,
2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269
	       unsigned int num, void **data, unsigned int *size)
{
	struct smb2_set_info_req *req;
	struct smb2_set_info_rsp *rsp = NULL;
	struct kvec *iov;
	int rc = 0;
	int resp_buftype;
	unsigned int i;
	struct TCP_Server_Info *server;
	struct cifs_ses *ses = tcon->ses;

	if (ses && (ses->server))
		server = ses->server;
	else
		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;
	}

2270 2271
	req->hdr.ProcessId = cpu_to_le32(pid);

2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299
	req->InfoType = SMB2_O_INFO_FILE;
	req->FileInfoClass = info_class;
	req->PersistentFileId = persistent_fid;
	req->VolatileFileId = volatile_fid;

	/* 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];
	}

	rc = SendReceive2(xid, ses, iov, num, &resp_buftype, 0);
	rsp = (struct smb2_set_info_rsp *)iov[0].iov_base;

2300
	if (rc != 0)
2301
		cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
2302

2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333
	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,
2334 2335
			   current->tgid, FILE_RENAME_INFORMATION, 2, data,
			   size);
2336 2337 2338
	kfree(data);
	return rc;
}
2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365

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,
2366
			   current->tgid, FILE_LINK_INFORMATION, 2, data, size);
2367 2368 2369
	kfree(data);
	return rc;
}
2370 2371 2372

int
SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2373
	     u64 volatile_fid, u32 pid, __le64 *eof, bool is_falloc)
2374 2375 2376 2377 2378 2379 2380 2381 2382 2383
{
	struct smb2_file_eof_info info;
	void *data;
	unsigned int size;

	info.EndOfFile = *eof;

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

2384 2385 2386 2387 2388 2389
	if (is_falloc)
		return send_set_info(xid, tcon, persistent_fid, volatile_fid,
			pid, FILE_ALLOCATION_INFORMATION, 1, &data, &size);
	else
		return send_set_info(xid, tcon, persistent_fid, volatile_fid,
			pid, FILE_END_OF_FILE_INFORMATION, 1, &data, &size);
2390
}
2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401

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,
			     current->tgid, FILE_BASIC_INFORMATION, 1,
			     (void **)&buf, &size);
}
2402 2403 2404 2405 2406 2407 2408 2409 2410

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;

2411
	cifs_dbg(FYI, "SMB2_oplock_break\n");
2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426
	rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);

	if (rc)
		return rc;

	req->VolatileFid = volatile_fid;
	req->PersistentFid = persistent_fid;
	req->OplockLevel = oplock_level;
	req->hdr.CreditRequest = cpu_to_le16(1);

	rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
	/* SMB2 buffer freed by function above */

	if (rc) {
		cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2427
		cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
2428 2429 2430 2431
	}

	return rc;
}
2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451

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);
	kst->f_bfree  = le64_to_cpu(pfs_inf->ActualAvailableAllocationUnits);
	kst->f_bavail = le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
	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;

2452
	cifs_dbg(FYI, "Query FSInfo level %d\n", level);
2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495 2496

	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;
	int rc = 0;
	int resp_buftype;
	struct cifs_ses *ses = tcon->ses;
	struct smb2_fs_full_size_info *info = NULL;

	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;

	rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0);
	if (rc) {
		cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2497
		goto qfsinf_exit;
2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508
	}
	rsp = (struct smb2_query_info_rsp *)iov.iov_base;

	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);

2509 2510 2511 2512 2513 2514 2515
qfsinf_exit:
	free_rsp_buf(resp_buftype, iov.iov_base);
	return rc;
}

int
SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
2516
	      u64 persistent_fid, u64 volatile_fid, int level)
2517 2518 2519 2520
{
	struct smb2_query_info_rsp *rsp = NULL;
	struct kvec iov;
	int rc = 0;
2521
	int resp_buftype, max_len, min_len;
2522 2523 2524
	struct cifs_ses *ses = tcon->ses;
	unsigned int rsp_len, offset;

2525 2526 2527 2528 2529 2530
	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
2531 2532 2533
	} else if (level == FS_SECTOR_SIZE_INFORMATION) {
		max_len = sizeof(struct smb3_fs_ss_info);
		min_len = sizeof(struct smb3_fs_ss_info);
2534
	} else {
S
Steven French 已提交
2535
		cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
2536 2537 2538 2539
		return -EINVAL;
	}

	rc = build_qfs_info_req(&iov, tcon, level, max_len,
2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552
				persistent_fid, volatile_fid);
	if (rc)
		return rc;

	rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0);
	if (rc) {
		cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
		goto qfsattr_exit;
	}
	rsp = (struct smb2_query_info_rsp *)iov.iov_base;

	rsp_len = le32_to_cpu(rsp->OutputBufferLength);
	offset = le16_to_cpu(rsp->OutputBufferOffset);
2553 2554 2555 2556 2557
	rc = validate_buf(offset, rsp_len, &rsp->hdr, min_len);
	if (rc)
		goto qfsattr_exit;

	if (level == FS_ATTRIBUTE_INFORMATION)
2558 2559
		memcpy(&tcon->fsAttrInfo, 4 /* RFC1001 len */ + offset
			+ (char *)&rsp->hdr, min_t(unsigned int,
2560 2561 2562 2563
			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
2564 2565 2566 2567 2568 2569 2570
	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);
	}
2571 2572

qfsattr_exit:
2573 2574 2575
	free_rsp_buf(resp_buftype, iov.iov_base);
	return rc;
}
2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587

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];
	int resp_buf_type;
	unsigned int count;

2588
	cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611

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

	req->hdr.ProcessId = cpu_to_le32(pid);
	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);
	rc = SendReceive2(xid, tcon->ses, iov, 2, &resp_buf_type, CIFS_NO_RESP);
	if (rc) {
2612
		cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634
		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);
}
2635 2636 2637 2638 2639 2640 2641 2642

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;

2643
	cifs_dbg(FYI, "SMB2_lease_break\n");
2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660
	rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);

	if (rc)
		return rc;

	req->hdr.CreditRequest = cpu_to_le16(1);
	req->StructureSize = cpu_to_le16(36);
	inc_rfc1001_len(req, 12);

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

	rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
	/* SMB2 buffer freed by function above */

	if (rc) {
		cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2661
		cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
2662 2663 2664 2665
	}

	return rc;
}