smb2pdu.c 87.4 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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#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 */
};


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

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

	cifs_mark_open_files_invalid(tcon);
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	if (tcon->use_persistent)
		tcon->need_reopen_files = true;
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	rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nls_codepage);
	mutex_unlock(&tcon->ses->session_mutex);
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	cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
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	if (rc)
		goto out;
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	if (smb2_command != SMB2_INTERNAL_CMD)
		queue_delayed_work(cifsiod_wq, &server->reconnect, 0);

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

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

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

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

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

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/*
 * Allocate and return pointer to an SMB request hdr, and set basic
 * SMB information in the SMB header. If the return code is zero, this
 * function must have filled in request_buf pointer.
 */
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);
	inc_rfc1001_len(req, 4 + sizeof(struct smb2_preauth_neg_context) + 2
			+ 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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	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);
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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...]);
	 */
	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 0x%x\n",
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			 le16_to_cpu(rsp->DialectRevision));
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		rc = -EIO;
		goto neg_exit;
	}
	server->dialect = le16_to_cpu(rsp->DialectRevision);

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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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	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;
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	}
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;
}

611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641
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;

642 643
	/* First session, not a reauthenticate */
	req->hdr.sync_hdr.SessionId = 0;
644 645 646 647 648 649

	/* 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 */
650
	req->hdr.sync_hdr.CreditRequest = cpu_to_le16(3);
651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686

	/* 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;
687
	struct kvec rsp_iov = { NULL, 0 };
688 689 690 691 692 693 694 695 696 697 698 699 700 701

	/* 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,
702 703 704
				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));
705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799

	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);
	if (ses->server->sign && ses->server->ops->generate_signingkey) {
		rc = ses->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(&ses->server->srv_mutex);
			goto keygen_exit;
		}
	}
	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);

keygen_exit:
	if (!ses->server->sign) {
		kfree(ses->auth_key.response);
		ses->auth_key.response = NULL;
	}
	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;
800
	ses->Suid = rsp->hdr.sync_hdr.SessionId;
801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824

	ses->session_flags = le16_to_cpu(rsp->SessionFlags);
	if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
		cifs_dbg(VFS, "SMB3 encryption not supported yet\n");

	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

825 826 827 828 829
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)
830
{
831 832
	int rc;
	struct cifs_ses *ses = sess_data->ses;
833
	struct smb2_sess_setup_rsp *rsp = NULL;
834
	char *ntlmssp_blob = NULL;
835
	bool use_spnego = false; /* else use raw ntlmssp */
836
	u16 blob_length = 0;
837

838 839 840 841 842
	/*
	 * If memory allocation is successful, caller of this function
	 * frees it.
	 */
	ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
843 844 845 846
	if (!ses->ntlmssp) {
		rc = -ENOMEM;
		goto out_err;
	}
847
	ses->ntlmssp->sesskey_per_smbsess = true;
848

849
	rc = SMB2_sess_alloc_buffer(sess_data);
850
	if (rc)
851
		goto out_err;
852

853 854 855 856 857 858
	ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
			       GFP_KERNEL);
	if (ntlmssp_blob == NULL) {
		rc = -ENOMEM;
		goto out;
	}
859

860 861 862 863 864 865 866 867 868 869 870 871
	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;
872

873 874
	rc = SMB2_sess_sendreceive(sess_data);
	rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
875

876 877
	/* If true, rc here is expected and not an error */
	if (sess_data->buf0_type != CIFS_NO_BUFFER &&
878
		rsp->hdr.sync_hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
879
		rc = 0;
880

881 882
	if (rc)
		goto out;
883

884 885 886 887
	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));
888
		rc = -EIO;
889
		goto out;
890
	}
891 892 893 894
	rc = decode_ntlmssp_challenge(rsp->Buffer,
			le16_to_cpu(rsp->SecurityBufferLength), ses);
	if (rc)
		goto out;
895

896
	cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
897 898


899
	ses->Suid = rsp->hdr.sync_hdr.SessionId;
900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917
	ses->session_flags = le16_to_cpu(rsp->SessionFlags);
	if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
		cifs_dbg(VFS, "SMB3 encryption not supported yet\n");

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;
}
918

919 920 921 922 923 924 925 926 927 928
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;
929

930 931 932
	rc = SMB2_sess_alloc_buffer(sess_data);
	if (rc)
		goto out;
933

934
	req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
935
	req->hdr.sync_hdr.SessionId = ses->Suid;
936 937 938 939 940 941

	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;
942 943
	}

944 945 946 947 948 949 950 951
	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;
952

953 954 955 956 957 958
	rc = SMB2_sess_sendreceive(sess_data);
	if (rc)
		goto out;

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

959
	ses->Suid = rsp->hdr.sync_hdr.SessionId;
960
	ses->session_flags = le16_to_cpu(rsp->SessionFlags);
961 962
	if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
		cifs_dbg(VFS, "SMB3 encryption not supported yet\n");
963

964 965 966 967 968 969 970 971 972
	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;
}
973

974 975 976 977 978
static int
SMB2_select_sec(struct cifs_ses *ses, struct SMB2_sess_data *sess_data)
{
	if (ses->sectype != Kerberos && ses->sectype != RawNTLMSSP)
		ses->sectype = RawNTLMSSP;
979

980 981 982 983 984 985 986 987 988 989
	switch (ses->sectype) {
	case Kerberos:
		sess_data->func = SMB2_auth_kerberos;
		break;
	case RawNTLMSSP:
		sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
		break;
	default:
		cifs_dbg(VFS, "secType %d not supported!\n", ses->sectype);
		return -EOPNOTSUPP;
990 991
	}

992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007
	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;
1008 1009
	}

1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024
	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);

1025
	rc = sess_data->result;
1026
out:
1027
	kfree(sess_data);
1028 1029 1030 1031 1032 1033 1034 1035 1036 1037
	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;

1038
	cifs_dbg(FYI, "disconnect session %p\n", ses);
1039 1040 1041 1042 1043 1044

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

1045 1046 1047 1048
	/* no need to send SMB logoff if uid already closed due to reconnect */
	if (ses->need_reconnect)
		goto smb2_session_already_dead;

1049 1050 1051 1052 1053
	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 */
1054
	req->hdr.sync_hdr.SessionId = ses->Suid;
1055
	if (server->sign)
1056
		req->hdr.sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1057

1058 1059
	rc = SendReceiveNoRsp(xid, ses, (char *) req, 0);
	cifs_small_buf_release(req);
1060 1061 1062 1063
	/*
	 * No tcon so can't do
	 * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
	 */
1064 1065

smb2_session_already_dead:
1066 1067
	return rc;
}
1068 1069 1070

static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
{
1071
	cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
1072 1073 1074 1075
}

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

S
Steve French 已提交
1076 1077 1078 1079 1080 1081 1082 1083
/* 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;
}

1084 1085 1086 1087 1088 1089 1090
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];
1091
	struct kvec rsp_iov;
1092 1093 1094 1095 1096 1097
	int rc = 0;
	int resp_buftype;
	int unc_path_len;
	struct TCP_Server_Info *server;
	__le16 *unc_path = NULL;

1098
	cifs_dbg(FYI, "TCON\n");
1099 1100 1101 1102 1103 1104 1105 1106 1107

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

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

S
Steve French 已提交
1108
	if ((tcon && tcon->seal) &&
1109 1110 1111 1112 1113
	    ((ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION) == 0)) {
		cifs_dbg(VFS, "encryption requested but no server support");
		return -EOPNOTSUPP;
	}

1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132
	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 */
1133
		req->hdr.sync_hdr.SessionId = ses->Suid;
1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150
		/* 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 */);

1151 1152 1153
	rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0, &rsp_iov);
	cifs_small_buf_release(req);
	rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
1154 1155 1156 1157 1158 1159 1160 1161 1162 1163

	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) {
1164
		ses->ipc_tid = rsp->hdr.sync_hdr.TreeId;
1165 1166 1167 1168
		goto tcon_exit;
	}

	if (rsp->ShareType & SMB2_SHARE_TYPE_DISK)
1169
		cifs_dbg(FYI, "connection to disk share\n");
1170 1171
	else if (rsp->ShareType & SMB2_SHARE_TYPE_PIPE) {
		tcon->ipc = true;
1172
		cifs_dbg(FYI, "connection to pipe share\n");
1173 1174
	} else if (rsp->ShareType & SMB2_SHARE_TYPE_PRINT) {
		tcon->print = true;
1175
		cifs_dbg(FYI, "connection to printer\n");
1176
	} else {
1177
		cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
1178 1179 1180 1181 1182
		rc = -EOPNOTSUPP;
		goto tcon_error_exit;
	}

	tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
1183
	tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
1184 1185 1186
	tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
	tcon->tidStatus = CifsGood;
	tcon->need_reconnect = false;
1187
	tcon->tid = rsp->hdr.sync_hdr.TreeId;
1188
	strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
1189 1190 1191

	if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
	    ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
1192
		cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
S
Steve French 已提交
1193
	init_copy_chunk_defaults(tcon);
1194 1195
	if (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA)
		cifs_dbg(VFS, "Encrypted shares not supported");
1196 1197
	if (tcon->ses->server->ops->validate_negotiate)
		rc = tcon->ses->server->ops->validate_negotiate(xid, tcon);
1198 1199 1200 1201 1202 1203
tcon_exit:
	free_rsp_buf(resp_buftype, rsp);
	kfree(unc_path);
	return rc;

tcon_error_exit:
1204
	if (rsp->hdr.sync_hdr.Status == STATUS_BAD_NETWORK_NAME) {
1205
		cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1206 1207
		if (tcon)
			tcon->bad_network_name = true;
1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219
	}
	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;

1220
	cifs_dbg(FYI, "Tree Disconnect\n");
1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233

	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;

1234 1235
	rc = SendReceiveNoRsp(xid, ses, (char *)req, 0);
	cifs_small_buf_release(req);
1236 1237 1238 1239 1240
	if (rc)
		cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);

	return rc;
}
1241

P
Pavel Shilovsky 已提交
1242

1243 1244 1245 1246 1247 1248 1249 1250 1251 1252
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
1253
					(struct create_durable, Data));
1254 1255 1256 1257
	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);
1258
	/* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
1259 1260 1261 1262 1263 1264 1265
	buf->Name[0] = 'D';
	buf->Name[1] = 'H';
	buf->Name[2] = 'n';
	buf->Name[3] = 'Q';
	return buf;
}

1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282
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;
1283
	/* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
1284 1285 1286 1287 1288 1289 1290
	buf->Name[0] = 'D';
	buf->Name[1] = 'H';
	buf->Name[2] = 'n';
	buf->Name[3] = 'C';
	return buf;
}

P
Pavel Shilovsky 已提交
1291
static __u8
1292 1293
parse_lease_state(struct TCP_Server_Info *server, struct smb2_create_rsp *rsp,
		  unsigned int *epoch)
P
Pavel Shilovsky 已提交
1294 1295
{
	char *data_offset;
1296
	struct create_context *cc;
1297 1298
	unsigned int next;
	unsigned int remaining;
1299
	char *name;
P
Pavel Shilovsky 已提交
1300

1301
	data_offset = (char *)rsp + 4 + le32_to_cpu(rsp->CreateContextsOffset);
1302
	remaining = le32_to_cpu(rsp->CreateContextsLength);
1303
	cc = (struct create_context *)data_offset;
1304
	while (remaining >= sizeof(struct create_context)) {
1305
		name = le16_to_cpu(cc->NameOffset) + (char *)cc;
1306 1307 1308 1309 1310 1311 1312 1313 1314 1315
		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
1316

1317
	return 0;
P
Pavel Shilovsky 已提交
1318 1319
}

1320
static int
1321 1322
add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
		  unsigned int *num_iovec, __u8 *oplock)
1323 1324 1325 1326
{
	struct smb2_create_req *req = iov[0].iov_base;
	unsigned int num = *num_iovec;

1327
	iov[num].iov_base = server->ops->create_lease_buf(oplock+1, *oplock);
1328 1329
	if (iov[num].iov_base == NULL)
		return -ENOMEM;
1330
	iov[num].iov_len = server->vals->create_lease_size;
1331 1332 1333 1334 1335
	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);
1336 1337 1338
	le32_add_cpu(&req->CreateContextsLength,
		     server->vals->create_lease_size);
	inc_rfc1001_len(&req->hdr, server->vals->create_lease_size);
1339 1340 1341 1342
	*num_iovec = num + 1;
	return 0;
}

1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360
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);
1361
	generate_random_uuid(buf->dcontext.CreateGuid);
1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404
	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;
}

1405
static int
1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427
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,
1428
		    struct cifs_open_parms *oparms)
1429 1430 1431 1432
{
	struct smb2_create_req *req = iov[0].iov_base;
	unsigned int num = *num_iovec;

1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466
	/* 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);
	}

1467 1468 1469 1470 1471 1472
	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();
1473 1474 1475 1476 1477 1478 1479
	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);
1480
	le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
1481 1482 1483 1484 1485
	inc_rfc1001_len(&req->hdr, sizeof(struct create_durable));
	*num_iovec = num + 1;
	return 0;
}

1486
int
1487
SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
1488 1489
	  __u8 *oplock, struct smb2_file_all_info *buf,
	  struct smb2_err_rsp **err_buf)
1490 1491 1492 1493
{
	struct smb2_create_req *req;
	struct smb2_create_rsp *rsp;
	struct TCP_Server_Info *server;
1494
	struct cifs_tcon *tcon = oparms->tcon;
1495
	struct cifs_ses *ses = tcon->ses;
1496
	struct kvec iov[4];
1497
	struct kvec rsp_iov;
1498 1499
	int resp_buftype;
	int uni_path_len;
P
Pavel Shilovsky 已提交
1500 1501
	__le16 *copy_path = NULL;
	int copy_size;
1502
	int rc = 0;
1503
	unsigned int n_iov = 2;
1504
	__u32 file_attributes = 0;
1505
	char *dhc_buf = NULL, *lc_buf = NULL;
1506

1507
	cifs_dbg(FYI, "create/open\n");
1508 1509 1510 1511 1512 1513 1514 1515 1516 1517

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

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

1518
	if (oparms->create_options & CREATE_OPTION_READONLY)
1519
		file_attributes |= ATTR_READONLY;
1520 1521
	if (oparms->create_options & CREATE_OPTION_SPECIAL)
		file_attributes |= ATTR_SYSTEM;
1522

1523
	req->ImpersonationLevel = IL_IMPERSONATION;
1524
	req->DesiredAccess = cpu_to_le32(oparms->desired_access);
1525 1526 1527
	/* File attributes ignored on open (used in create though) */
	req->FileAttributes = cpu_to_le32(file_attributes);
	req->ShareAccess = FILE_SHARE_ALL_LE;
1528 1529
	req->CreateDisposition = cpu_to_le32(oparms->disposition);
	req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
1530
	uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
1531 1532
	/* do not count rfc1001 len field */
	req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req) - 4);
1533 1534 1535 1536 1537 1538

	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 */
1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553
	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;
1554 1555
	}

1556 1557 1558 1559 1560
	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
1561 1562 1563
	if (!server->oplocks)
		*oplock = SMB2_OPLOCK_LEVEL_NONE;

1564
	if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
P
Pavel Shilovsky 已提交
1565 1566 1567
	    *oplock == SMB2_OPLOCK_LEVEL_NONE)
		req->RequestedOplockLevel = *oplock;
	else {
1568
		rc = add_lease_context(server, iov, &n_iov, oplock);
1569
		if (rc) {
P
Pavel Shilovsky 已提交
1570 1571
			cifs_small_buf_release(req);
			kfree(copy_path);
1572
			return rc;
P
Pavel Shilovsky 已提交
1573
		}
1574
		lc_buf = iov[n_iov-1].iov_base;
P
Pavel Shilovsky 已提交
1575 1576
	}

1577 1578
	if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
		/* need to set Next field of lease context if we request it */
1579
		if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
1580
			struct create_context *ccontext =
1581
			    (struct create_context *)iov[n_iov-1].iov_base;
1582
			ccontext->Next =
1583
				cpu_to_le32(server->vals->create_lease_size);
1584
		}
1585

1586
		rc = add_durable_context(iov, &n_iov, oparms,
1587
					tcon->use_persistent);
1588 1589 1590
		if (rc) {
			cifs_small_buf_release(req);
			kfree(copy_path);
1591
			kfree(lc_buf);
1592 1593
			return rc;
		}
1594
		dhc_buf = iov[n_iov-1].iov_base;
1595 1596
	}

1597 1598 1599
	rc = SendReceive2(xid, ses, iov, n_iov, &resp_buftype, 0, &rsp_iov);
	cifs_small_buf_release(req);
	rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
1600 1601 1602

	if (rc != 0) {
		cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
1603 1604 1605
		if (err_buf)
			*err_buf = kmemdup(rsp, get_rfc1002_length(rsp) + 4,
					   GFP_KERNEL);
1606 1607 1608
		goto creat_exit;
	}

1609 1610
	oparms->fid->persistent_fid = rsp->PersistentFileId;
	oparms->fid->volatile_fid = rsp->VolatileFileId;
1611 1612 1613 1614 1615 1616 1617 1618 1619

	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
1620

P
Pavel Shilovsky 已提交
1621
	if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
1622
		*oplock = parse_lease_state(server, rsp, &oparms->fid->epoch);
P
Pavel Shilovsky 已提交
1623 1624
	else
		*oplock = rsp->OplockLevel;
1625
creat_exit:
P
Pavel Shilovsky 已提交
1626
	kfree(copy_path);
1627 1628
	kfree(lc_buf);
	kfree(dhc_buf);
1629 1630 1631 1632
	free_rsp_buf(resp_buftype, rsp);
	return rc;
}

1633 1634 1635 1636 1637 1638 1639 1640 1641 1642
/*
 *	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;
1643
	struct smb2_sync_hdr *shdr;
1644
	struct TCP_Server_Info *server;
1645
	struct cifs_ses *ses;
1646
	struct kvec iov[2];
1647
	struct kvec rsp_iov;
1648
	int resp_buftype;
1649
	int n_iov;
1650 1651 1652 1653
	int rc = 0;

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

1654 1655 1656
	if (out_data != NULL)
		*out_data = NULL;

1657 1658 1659 1660
	/* zero out returned data len, in case of error */
	if (plen)
		*plen = 0;

1661 1662 1663 1664 1665
	if (tcon)
		ses = tcon->ses;
	else
		return -EIO;

1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685
	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;
1686
		n_iov = 2;
1687
	} else
1688
		n_iov = 1;
1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707

	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;

S
Steve French 已提交
1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723
	/*
	 * 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;

1724

1725 1726 1727
	rc = SendReceive2(xid, ses, iov, n_iov, &resp_buftype, 0, &rsp_iov);
	cifs_small_buf_release(req);
	rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
1728

1729
	if ((rc != 0) && (rc != -EINVAL)) {
1730
		cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1731
		goto ioctl_exit;
1732 1733 1734
	} else if (rc == -EINVAL) {
		if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
		    (opcode != FSCTL_SRV_COPYCHUNK)) {
1735
			cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1736 1737
			goto ioctl_exit;
		}
1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769
	}

	/* 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;
	}

1770 1771
	shdr = get_sync_hdr(rsp);
	memcpy(*out_data, (char *)shdr + le32_to_cpu(rsp->OutputOffset), *plen);
1772 1773 1774 1775 1776
ioctl_exit:
	free_rsp_buf(resp_buftype, rsp);
	return rc;
}

1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789
/*
 *   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 =
1790
			cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801

	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;
}

1802 1803 1804 1805 1806 1807 1808 1809 1810
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];
1811
	struct kvec rsp_iov;
1812 1813 1814
	int resp_buftype;
	int rc = 0;

1815
	cifs_dbg(FYI, "Close\n");
1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832

	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;

1833 1834 1835
	rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0, &rsp_iov);
	cifs_small_buf_release(req);
	rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
1836 1837

	if (rc != 0) {
1838
		cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
1839 1840 1841 1842 1843 1844 1845 1846 1847
		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
1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860

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) {
1861 1862
		cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
			 buffer_length, min_buf_size);
P
Pavel Shilovsky 已提交
1863 1864 1865 1866 1867
		return -EINVAL;
	}

	/* check if beyond RFC1001 maximum length */
	if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
1868 1869
		cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
			 buffer_length, smb_len);
P
Pavel Shilovsky 已提交
1870 1871 1872 1873
		return -EINVAL;
	}

	if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
1874
		cifs_dbg(VFS, "illegal server response, bad offset to data\n");
P
Pavel Shilovsky 已提交
1875 1876 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
		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;
}

1906 1907 1908 1909
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
1910 1911 1912 1913
{
	struct smb2_query_info_req *req;
	struct smb2_query_info_rsp *rsp = NULL;
	struct kvec iov[2];
1914
	struct kvec rsp_iov;
P
Pavel Shilovsky 已提交
1915 1916 1917 1918 1919
	int rc = 0;
	int resp_buftype;
	struct TCP_Server_Info *server;
	struct cifs_ses *ses = tcon->ses;

1920
	cifs_dbg(FYI, "Query Info\n");
P
Pavel Shilovsky 已提交
1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931

	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;
1932
	req->FileInfoClass = info_class;
P
Pavel Shilovsky 已提交
1933 1934 1935 1936 1937
	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);
1938
	req->OutputBufferLength = cpu_to_le32(output_len);
P
Pavel Shilovsky 已提交
1939 1940 1941 1942 1943

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

1944 1945 1946
	rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0, &rsp_iov);
	cifs_small_buf_release(req);
	rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
1947

P
Pavel Shilovsky 已提交
1948 1949 1950 1951 1952 1953 1954
	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),
1955
				   &rsp->hdr, min_len, data);
P
Pavel Shilovsky 已提交
1956 1957 1958 1959 1960

qinf_exit:
	free_rsp_buf(resp_buftype, rsp);
	return rc;
}
1961

1962 1963 1964 1965 1966 1967 1968
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,
1969
			  sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982
			  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);
}

1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993
/*
 * 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;
1994
	struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
1995 1996 1997
	unsigned int credits_received = 1;

	if (mid->mid_state == MID_RESPONSE_RECEIVED)
1998
		credits_received = le16_to_cpu(rsp->hdr.sync_hdr.CreditRequest);
1999

2000
	mutex_lock(&server->srv_mutex);
2001
	DeleteMidQEntry(mid);
2002
	mutex_unlock(&server->srv_mutex);
2003 2004 2005
	add_credits(server, credits_received, CIFS_ECHO_OP);
}

2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023
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;

	/* 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) {
2024
			if (tcon->need_reconnect || tcon->need_reopen_files) {
2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040
				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) {
2041 2042
		if (!smb2_reconnect(SMB2_INTERNAL_CMD, tcon))
			cifs_reopen_persistent_handles(tcon);
2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054
		list_del_init(&tcon->rlist);
		cifs_put_tcon(tcon);
	}

	cifs_dbg(FYI, "Reconnecting tcons finished\n");
	mutex_unlock(&server->reconnect_mutex);

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

2055 2056 2057 2058 2059
int
SMB2_echo(struct TCP_Server_Info *server)
{
	struct smb2_echo_req *req;
	int rc = 0;
2060 2061 2062
	struct kvec iov[2];
	struct smb_rqst rqst = { .rq_iov = iov,
				 .rq_nvec = 2 };
2063

2064
	cifs_dbg(FYI, "In echo request\n");
2065

2066
	if (server->tcpStatus == CifsNeedNegotiate) {
2067 2068 2069
		/* No need to send echo on newly established connections */
		queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
		return rc;
2070 2071
	}

2072 2073 2074 2075
	rc = small_smb2_init(SMB2_ECHO, NULL, (void **)&req);
	if (rc)
		return rc;

2076
	req->hdr.sync_hdr.CreditRequest = cpu_to_le16(1);
2077 2078

	/* 4 for rfc1002 length field */
2079 2080 2081 2082
	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;
2083

2084
	rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, server,
2085 2086
			     CIFS_ECHO_OP);
	if (rc)
2087
		cifs_dbg(FYI, "Echo request failed: %d\n", rc);
2088 2089 2090 2091

	cifs_small_buf_release(req);
	return rc;
}
2092 2093 2094 2095 2096 2097 2098 2099 2100

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];
2101
	struct kvec rsp_iov;
2102 2103 2104
	int resp_buftype;
	int rc = 0;

2105
	cifs_dbg(FYI, "Flush\n");
2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122

	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;

2123 2124
	rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0, &rsp_iov);
	cifs_small_buf_release(req);
2125

2126
	if (rc != 0)
2127 2128
		cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);

2129
	free_rsp_buf(resp_buftype, rsp_iov.iov_base);
2130 2131
	return rc;
}
2132 2133 2134 2135 2136 2137

/*
 * 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
2138 2139 2140
smb2_new_read_req(void **buf, unsigned int *total_len,
		  struct cifs_io_parms *io_parms, unsigned int remaining_bytes,
		  int request_type)
2141 2142 2143
{
	int rc = -EACCES;
	struct smb2_read_req *req = NULL;
2144
	struct smb2_sync_hdr *shdr;
2145 2146 2147 2148 2149 2150 2151

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

2152 2153
	shdr = get_sync_hdr(req);
	shdr->ProcessId = cpu_to_le32(io_parms->pid);
2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166

	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 */
2167
			shdr->NextCommand =
2168 2169
				cpu_to_le32(get_rfc1002_length(req) + 4);
		} else /* END_OF_CHAIN */
2170
			shdr->NextCommand = 0;
2171
		if (request_type & RELATED_REQUEST) {
2172
			shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
2173 2174 2175 2176
			/*
			 * Related requests use info from previous read request
			 * in chain.
			 */
2177 2178
			shdr->SessionId = 0xFFFFFFFF;
			shdr->TreeId = 0xFFFFFFFF;
2179 2180 2181 2182 2183 2184 2185 2186 2187
			req->PersistentFileId = 0xFFFFFFFF;
			req->VolatileFileId = 0xFFFFFFFF;
		}
	}
	if (remaining_bytes > io_parms->length)
		req->RemainingBytes = cpu_to_le32(remaining_bytes);
	else
		req->RemainingBytes = 0;

2188
	*buf = req;
2189
	/* 4 for rfc1002 length field */
2190
	*total_len = get_rfc1002_length(req) + 4;
2191 2192 2193 2194 2195 2196 2197 2198 2199
	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;
2200 2201
	struct smb2_sync_hdr *shdr =
				(struct smb2_sync_hdr *)rdata->iov[1].iov_base;
2202
	unsigned int credits_received = 1;
2203 2204
	struct smb_rqst rqst = { .rq_iov = rdata->iov,
				 .rq_nvec = 2,
2205 2206 2207 2208
				 .rq_pages = rdata->pages,
				 .rq_npages = rdata->nr_pages,
				 .rq_pagesz = rdata->pagesz,
				 .rq_tailsz = rdata->tailsz };
2209

2210 2211 2212
	cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
		 __func__, mid->mid, mid->mid_state, rdata->result,
		 rdata->bytes);
2213 2214 2215

	switch (mid->mid_state) {
	case MID_RESPONSE_RECEIVED:
2216
		credits_received = le16_to_cpu(shdr->CreditRequest);
2217
		/* result already set, check signature */
2218
		if (server->sign) {
P
Pavel Shilovsky 已提交
2219 2220
			int rc;

2221
			rc = smb2_verify_signature(&rqst, server);
P
Pavel Shilovsky 已提交
2222
			if (rc)
2223 2224
				cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
					 rc);
P
Pavel Shilovsky 已提交
2225
		}
2226
		/* FIXME: should this be counted toward the initiating task? */
2227 2228
		task_io_account_read(rdata->got_bytes);
		cifs_stats_bytes_read(tcon, rdata->got_bytes);
2229 2230 2231 2232
		break;
	case MID_REQUEST_SUBMITTED:
	case MID_RETRY_NEEDED:
		rdata->result = -EAGAIN;
2233 2234 2235 2236 2237 2238
		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);
2239 2240 2241 2242 2243 2244 2245 2246 2247 2248
		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);
2249
	mutex_lock(&server->srv_mutex);
2250
	DeleteMidQEntry(mid);
2251
	mutex_unlock(&server->srv_mutex);
2252 2253 2254
	add_credits(server, credits_received, 0);
}

2255
/* smb2_async_readv - send an async read, and set up mid to handle result */
2256 2257 2258
int
smb2_async_readv(struct cifs_readdata *rdata)
{
2259
	int rc, flags = 0;
2260 2261
	char *buf;
	struct smb2_sync_hdr *shdr;
2262
	struct cifs_io_parms io_parms;
2263 2264
	struct smb_rqst rqst = { .rq_iov = rdata->iov,
				 .rq_nvec = 2 };
2265
	struct TCP_Server_Info *server;
2266
	unsigned int total_len;
2267

2268 2269
	cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
		 __func__, rdata->offset, rdata->bytes);
2270 2271 2272 2273 2274 2275 2276

	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;
2277 2278 2279

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

2280
	rc = smb2_new_read_req((void **) &buf, &total_len, &io_parms, 0, 0);
2281 2282 2283 2284 2285 2286 2287 2288 2289
	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);
		}
2290
		return rc;
2291
	}
2292

2293
	shdr = get_sync_hdr(buf);
2294
	/* 4 for rfc1002 length field */
2295 2296 2297 2298
	rdata->iov[0].iov_len = 4;
	rdata->iov[0].iov_base = buf;
	rdata->iov[1].iov_len = total_len - 4;
	rdata->iov[1].iov_base = buf + 4;
2299

2300
	if (rdata->credits) {
2301
		shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
2302
						SMB2_MAX_BUFFER_SIZE));
2303
		shdr->CreditRequest = shdr->CreditCharge;
2304 2305
		spin_lock(&server->req_lock);
		server->credits += rdata->credits -
2306
						le16_to_cpu(shdr->CreditCharge);
2307 2308 2309 2310 2311
		spin_unlock(&server->req_lock);
		wake_up(&server->request_q);
		flags = CIFS_HAS_CREDITS;
	}

2312
	kref_get(&rdata->refcount);
2313
	rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
2314
			     cifs_readv_receive, smb2_readv_callback,
2315
			     rdata, flags);
2316
	if (rc) {
2317
		kref_put(&rdata->refcount, cifs_readdata_release);
2318 2319
		cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
	}
2320 2321 2322 2323

	cifs_small_buf_release(buf);
	return rc;
}
2324

2325 2326 2327 2328 2329 2330
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;
2331
	struct smb2_sync_hdr *shdr;
2332
	struct kvec iov[1];
2333
	struct kvec rsp_iov;
2334 2335
	unsigned int total_len;
	char *req;
2336 2337

	*nbytes = 0;
2338
	rc = smb2_new_read_req((void **)&req, &total_len, io_parms, 0, 0);
2339 2340 2341
	if (rc)
		return rc;

2342 2343 2344
	iov[0].iov_base = buf;
	iov[0].iov_len = total_len;

2345
	rc = SendReceive2(xid, io_parms->tcon->ses, iov, 1,
2346 2347
			  &resp_buftype, CIFS_LOG_ERROR, &rsp_iov);
	cifs_small_buf_release(iov[0].iov_base);
2348

2349
	rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
2350
	shdr = get_sync_hdr(rsp);
2351

2352
	if (shdr->Status == STATUS_END_OF_FILE) {
2353
		free_rsp_buf(resp_buftype, rsp_iov.iov_base);
2354 2355 2356 2357 2358
		return 0;
	}

	if (rc) {
		cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
2359
		cifs_dbg(VFS, "Send error in read = %d\n", rc);
2360 2361 2362 2363
	} else {
		*nbytes = le32_to_cpu(rsp->DataLength);
		if ((*nbytes > CIFS_MAX_MSGSIZE) ||
		    (*nbytes > io_parms->length)) {
2364 2365
			cifs_dbg(FYI, "bad length %d for count %d\n",
				 *nbytes, io_parms->length);
2366 2367 2368 2369 2370 2371
			rc = -EIO;
			*nbytes = 0;
		}
	}

	if (*buf) {
2372
		memcpy(*buf, (char *)shdr + rsp->DataOffset, *nbytes);
2373
		free_rsp_buf(resp_buftype, rsp_iov.iov_base);
2374
	} else if (resp_buftype != CIFS_NO_BUFFER) {
2375
		*buf = rsp_iov.iov_base;
2376 2377 2378 2379 2380 2381 2382 2383
		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;
}

2384 2385 2386 2387 2388 2389 2390 2391 2392
/*
 * 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);
2393
	struct TCP_Server_Info *server = tcon->ses->server;
2394 2395 2396 2397 2398 2399
	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:
2400
		credits_received = le16_to_cpu(rsp->hdr.sync_hdr.CreditRequest);
2401 2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432
		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);
2433
	mutex_lock(&server->srv_mutex);
2434
	DeleteMidQEntry(mid);
2435
	mutex_unlock(&server->srv_mutex);
2436 2437 2438 2439 2440
	add_credits(tcon->ses->server, credits_received, 0);
}

/* smb2_async_writev - send an async write, and set up mid to handle result */
int
2441 2442
smb2_async_writev(struct cifs_writedata *wdata,
		  void (*release)(struct kref *kref))
2443
{
2444
	int rc = -EACCES, flags = 0;
2445
	struct smb2_write_req *req = NULL;
2446
	struct smb2_sync_hdr *shdr;
2447
	struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
2448
	struct TCP_Server_Info *server = tcon->ses->server;
2449 2450
	struct kvec iov[2];
	struct smb_rqst rqst = { };
2451 2452

	rc = small_smb2_init(SMB2_WRITE, tcon, (void **) &req);
2453 2454 2455 2456 2457 2458 2459 2460 2461
	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);
		}
2462
		goto async_writev_out;
2463
	}
2464

2465 2466
	shdr = get_sync_hdr(req);
	shdr->ProcessId = cpu_to_le32(wdata->cfile->pid);
2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479

	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 */
2480 2481 2482 2483
	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;
2484

2485 2486
	rqst.rq_iov = iov;
	rqst.rq_nvec = 2;
2487 2488 2489 2490
	rqst.rq_pages = wdata->pages;
	rqst.rq_npages = wdata->nr_pages;
	rqst.rq_pagesz = wdata->pagesz;
	rqst.rq_tailsz = wdata->tailsz;
2491

2492 2493
	cifs_dbg(FYI, "async write at %llu %u bytes\n",
		 wdata->offset, wdata->bytes);
2494 2495 2496 2497 2498

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

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

2499
	if (wdata->credits) {
2500
		shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
2501
						    SMB2_MAX_BUFFER_SIZE));
2502
		shdr->CreditRequest = shdr->CreditCharge;
2503 2504
		spin_lock(&server->req_lock);
		server->credits += wdata->credits -
2505
						le16_to_cpu(shdr->CreditCharge);
2506 2507 2508 2509 2510
		spin_unlock(&server->req_lock);
		wake_up(&server->request_q);
		flags = CIFS_HAS_CREDITS;
	}

2511
	kref_get(&wdata->refcount);
2512 2513
	rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, wdata,
			     flags);
2514

2515
	if (rc) {
2516
		kref_put(&wdata->refcount, release);
2517 2518
		cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
	}
2519 2520 2521 2522 2523

async_writev_out:
	cifs_small_buf_release(req);
	return rc;
}
2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538

/*
 * 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;
2539 2540
	struct kvec rsp_iov;

2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552
	*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;

2553
	req->hdr.sync_hdr.ProcessId = cpu_to_le32(io_parms->pid);
2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574

	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,
2575 2576 2577
			  &resp_buftype, 0, &rsp_iov);
	cifs_small_buf_release(req);
	rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
2578 2579 2580

	if (rc) {
		cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
2581
		cifs_dbg(VFS, "Send error in write = %d\n", rc);
2582
	} else
2583
		*nbytes = le32_to_cpu(rsp->DataLength);
2584 2585

	free_rsp_buf(resp_buftype, rsp);
2586 2587
	return rc;
}
2588

2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606
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) {
2607
			cifs_dbg(VFS, "malformed search entry would overflow\n");
2608 2609 2610 2611 2612
			break;
		}

		len = le32_to_cpu(entryptr->FileNameLength);
		if ((char *)entryptr + len + size > end_of_buf) {
2613 2614
			cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
				 end_of_buf);
2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639
			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];
2640
	struct kvec rsp_iov;
2641 2642
	int rc = 0;
	int len;
2643
	int resp_buftype = CIFS_NO_BUFFER;
2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670
	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:
2671 2672
		cifs_dbg(VFS, "info level %u isn't supported\n",
			 srch_inf->info_level);
2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704
		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 */);

2705 2706 2707
	rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0, &rsp_iov);
	cifs_small_buf_release(req);
	rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
2708

2709
	if (rc) {
2710 2711
		if (rc == -ENODATA &&
		    rsp->hdr.sync_hdr.Status == STATUS_NO_MORE_FILES) {
2712 2713 2714
			srch_inf->endOfSearch = true;
			rc = 0;
		}
2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741
		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;
2742 2743 2744
	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);
2745 2746 2747 2748 2749
	if (resp_buftype == CIFS_LARGE_BUFFER)
		srch_inf->smallBuf = false;
	else if (resp_buftype == CIFS_SMALL_BUFFER)
		srch_inf->smallBuf = true;
	else
2750
		cifs_dbg(VFS, "illegal search buffer type\n");
2751 2752 2753 2754 2755 2756 2757 2758

	return rc;

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

2759 2760
static int
send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2761
	       u64 persistent_fid, u64 volatile_fid, u32 pid, int info_class,
2762 2763 2764 2765 2766
	       unsigned int num, void **data, unsigned int *size)
{
	struct smb2_set_info_req *req;
	struct smb2_set_info_rsp *rsp = NULL;
	struct kvec *iov;
2767
	struct kvec rsp_iov;
2768 2769 2770 2771 2772 2773 2774 2775 2776 2777 2778 2779 2780 2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791
	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;
	}

2792
	req->hdr.sync_hdr.ProcessId = cpu_to_le32(pid);
2793

2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818
	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];
	}

2819 2820 2821
	rc = SendReceive2(xid, ses, iov, num, &resp_buftype, 0, &rsp_iov);
	cifs_small_buf_release(req);
	rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
2822

2823
	if (rc != 0)
2824
		cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
2825

2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856
	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,
2857 2858
			   current->tgid, FILE_RENAME_INFORMATION, 2, data,
			   size);
2859 2860 2861
	kfree(data);
	return rc;
}
2862

2863 2864 2865 2866 2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877 2878
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,
			current->tgid, FILE_DISPOSITION_INFORMATION, 1, &data,
			&size);
}

2879 2880 2881 2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893 2894 2895 2896 2897 2898 2899 2900 2901 2902 2903 2904
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,
2905
			   current->tgid, FILE_LINK_INFORMATION, 2, data, size);
2906 2907 2908
	kfree(data);
	return rc;
}
2909 2910 2911

int
SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2912
	     u64 volatile_fid, u32 pid, __le64 *eof, bool is_falloc)
2913 2914 2915 2916 2917 2918 2919 2920 2921 2922
{
	struct smb2_file_eof_info info;
	void *data;
	unsigned int size;

	info.EndOfFile = *eof;

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

2923 2924 2925 2926 2927 2928
	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);
2929
}
2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940

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);
}
2941 2942 2943 2944 2945 2946 2947 2948 2949

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;

2950
	cifs_dbg(FYI, "SMB2_oplock_break\n");
2951 2952 2953 2954 2955 2956 2957 2958
	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;
2959
	req->hdr.sync_hdr.CreditRequest = cpu_to_le16(1);
2960 2961

	rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2962
	cifs_small_buf_release(req);
2963 2964 2965

	if (rc) {
		cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2966
		cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
2967 2968 2969 2970
	}

	return rc;
}
2971 2972 2973 2974 2975 2976 2977 2978 2979 2980 2981 2982 2983 2984 2985 2986 2987 2988 2989 2990

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;

2991
	cifs_dbg(FYI, "Query FSInfo level %d\n", level);
2992 2993 2994 2995 2996 2997 2998 2999 3000 3001 3002 3003 3004 3005 3006 3007 3008 3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021

	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;
3022
	struct kvec rsp_iov;
3023 3024 3025 3026 3027 3028 3029 3030 3031 3032 3033
	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;

3034 3035
	rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0, &rsp_iov);
	cifs_small_buf_release(iov.iov_base);
3036 3037
	if (rc) {
		cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3038
		goto qfsinf_exit;
3039
	}
3040
	rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3041 3042 3043 3044 3045 3046 3047 3048 3049

	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);

3050
qfsinf_exit:
3051
	free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3052 3053 3054 3055 3056
	return rc;
}

int
SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
3057
	      u64 persistent_fid, u64 volatile_fid, int level)
3058 3059 3060
{
	struct smb2_query_info_rsp *rsp = NULL;
	struct kvec iov;
3061
	struct kvec rsp_iov;
3062
	int rc = 0;
3063
	int resp_buftype, max_len, min_len;
3064 3065 3066
	struct cifs_ses *ses = tcon->ses;
	unsigned int rsp_len, offset;

3067 3068 3069 3070 3071 3072
	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
3073 3074 3075
	} else if (level == FS_SECTOR_SIZE_INFORMATION) {
		max_len = sizeof(struct smb3_fs_ss_info);
		min_len = sizeof(struct smb3_fs_ss_info);
3076
	} else {
S
Steven French 已提交
3077
		cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
3078 3079 3080 3081
		return -EINVAL;
	}

	rc = build_qfs_info_req(&iov, tcon, level, max_len,
3082 3083 3084 3085
				persistent_fid, volatile_fid);
	if (rc)
		return rc;

3086 3087
	rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0, &rsp_iov);
	cifs_small_buf_release(iov.iov_base);
3088 3089 3090 3091
	if (rc) {
		cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
		goto qfsattr_exit;
	}
3092
	rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3093 3094 3095

	rsp_len = le32_to_cpu(rsp->OutputBufferLength);
	offset = le16_to_cpu(rsp->OutputBufferOffset);
3096 3097 3098 3099 3100
	rc = validate_buf(offset, rsp_len, &rsp->hdr, min_len);
	if (rc)
		goto qfsattr_exit;

	if (level == FS_ATTRIBUTE_INFORMATION)
3101 3102
		memcpy(&tcon->fsAttrInfo, 4 /* RFC1001 len */ + offset
			+ (char *)&rsp->hdr, min_t(unsigned int,
3103 3104 3105 3106
			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
3107 3108 3109 3110 3111 3112 3113
	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);
	}
3114 3115

qfsattr_exit:
3116
	free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3117 3118
	return rc;
}
3119 3120 3121 3122 3123 3124 3125 3126 3127

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];
3128
	struct kvec rsp_iov;
3129 3130 3131
	int resp_buf_type;
	unsigned int count;

3132
	cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
3133 3134 3135 3136 3137

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

3138
	req->hdr.sync_hdr.ProcessId = cpu_to_le32(pid);
3139 3140 3141 3142 3143 3144 3145 3146 3147 3148 3149 3150 3151 3152 3153
	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);
3154 3155 3156
	rc = SendReceive2(xid, tcon->ses, iov, 2, &resp_buf_type, CIFS_NO_RESP,
			  &rsp_iov);
	cifs_small_buf_release(req);
3157
	if (rc) {
3158
		cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
3159 3160 3161 3162 3163 3164 3165 3166 3167 3168 3169 3170 3171 3172 3173 3174 3175 3176 3177 3178 3179 3180
		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);
}
3181 3182 3183 3184 3185 3186 3187 3188

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;

3189
	cifs_dbg(FYI, "SMB2_lease_break\n");
3190 3191 3192 3193 3194
	rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);

	if (rc)
		return rc;

3195
	req->hdr.sync_hdr.CreditRequest = cpu_to_le16(1);
3196 3197 3198 3199 3200 3201 3202
	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);
3203
	cifs_small_buf_release(req);
3204 3205 3206

	if (rc) {
		cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
3207
		cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
3208 3209 3210 3211
	}

	return rc;
}