smb2pdu.c 59.7 KB
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/*
 *   fs/cifs/smb2pdu.c
 *
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 *   Copyright (C) International Business Machines  Corp., 2009, 2012
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 *                 Etersoft, 2012
 *   Author(s): Steve French (sfrench@us.ibm.com)
 *              Pavel Shilovsky (pshilovsky@samba.org) 2012
 *
 *   Contains the routines for constructing the SMB2 PDUs themselves
 *
 *   This library is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU Lesser General Public License as published
 *   by the Free Software Foundation; either version 2.1 of the License, or
 *   (at your option) any later version.
 *
 *   This library is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 *   the GNU Lesser General Public License for more details.
 *
 *   You should have received a copy of the GNU Lesser General Public License
 *   along with this library; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

 /* SMB2 PDU handling routines here - except for leftovers (eg session setup) */
 /* Note that there are handle based routines which must be		      */
 /* treated slightly differently for reconnection purposes since we never     */
 /* want to reuse a stale file handle and only the caller knows the file info */

#include <linux/fs.h>
#include <linux/kernel.h>
#include <linux/vfs.h>
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#include <linux/task_io_accounting_ops.h>
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#include <linux/uaccess.h>
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#include <linux/pagemap.h>
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#include <linux/xattr.h>
#include "smb2pdu.h"
#include "cifsglob.h"
#include "cifsacl.h"
#include "cifsproto.h"
#include "smb2proto.h"
#include "cifs_unicode.h"
#include "cifs_debug.h"
#include "ntlmssp.h"
#include "smb2status.h"
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#include "smb2glob.h"
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#include "cifspdu.h"
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/*
 *  The following table defines the expected "StructureSize" of SMB2 requests
 *  in order by SMB2 command.  This is similar to "wct" in SMB/CIFS requests.
 *
 *  Note that commands are defined in smb2pdu.h in le16 but the array below is
 *  indexed by command in host byte order.
 */
static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
	/* SMB2_NEGOTIATE */ 36,
	/* SMB2_SESSION_SETUP */ 25,
	/* SMB2_LOGOFF */ 4,
	/* SMB2_TREE_CONNECT */	9,
	/* SMB2_TREE_DISCONNECT */ 4,
	/* SMB2_CREATE */ 57,
	/* SMB2_CLOSE */ 24,
	/* SMB2_FLUSH */ 24,
	/* SMB2_READ */	49,
	/* SMB2_WRITE */ 49,
	/* SMB2_LOCK */	48,
	/* SMB2_IOCTL */ 57,
	/* SMB2_CANCEL */ 4,
	/* SMB2_ECHO */ 4,
	/* SMB2_QUERY_DIRECTORY */ 33,
	/* SMB2_CHANGE_NOTIFY */ 32,
	/* SMB2_QUERY_INFO */ 41,
	/* SMB2_SET_INFO */ 33,
	/* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
};


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

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

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

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

	if (!tcon)
		goto out;

	hdr->TreeId = tcon->tid;
	/* Uid is not converted */
	if (tcon->ses)
		hdr->SessionId = tcon->ses->Suid;
	/* BB check following DFS flags BB */
	/* BB do we have to add check for SHI1005_FLAGS_DFS_ROOT too? */
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	if (tcon->share_flags & SHI1005_FLAGS_DFS)
		hdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS;
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	/* BB how does SMB2 do case sensitive? */
	/* if (tcon->nocase)
		hdr->Flags |= SMBFLG_CASELESS; */
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	if (tcon->ses && tcon->ses->server &&
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	    (tcon->ses->server->sec_mode & SECMODE_SIGN_REQUIRED))
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		hdr->Flags |= SMB2_FLAGS_SIGNED;
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out:
	pdu->StructureSize2 = cpu_to_le16(parmsize);
	return;
}

static int
smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
{
	int rc = 0;
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	struct nls_table *nls_codepage;
	struct cifs_ses *ses;
	struct TCP_Server_Info *server;

	/*
	 * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
	 * check for tcp and smb session status done differently
	 * for those three - in the calling routine.
	 */
	if (tcon == NULL)
		return rc;

	if (smb2_command == SMB2_TREE_CONNECT)
		return rc;

	if (tcon->tidStatus == CifsExiting) {
		/*
		 * only tree disconnect, open, and write,
		 * (and ulogoff which does not have tcon)
		 * are allowed as we start force umount.
		 */
		if ((smb2_command != SMB2_WRITE) &&
		   (smb2_command != SMB2_CREATE) &&
		   (smb2_command != SMB2_TREE_DISCONNECT)) {
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			cifs_dbg(FYI, "can not send cmd %d while umounting\n",
				 smb2_command);
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			return -ENODEV;
		}
	}
	if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
	    (!tcon->ses->server))
		return -EIO;

	ses = tcon->ses;
	server = ses->server;

	/*
	 * Give demultiplex thread up to 10 seconds to reconnect, should be
	 * greater than cifs socket timeout which is 7 seconds
	 */
	while (server->tcpStatus == CifsNeedReconnect) {
		/*
		 * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
		 * here since they are implicitly done when session drops.
		 */
		switch (smb2_command) {
		/*
		 * BB Should we keep oplock break and add flush to exceptions?
		 */
		case SMB2_TREE_DISCONNECT:
		case SMB2_CANCEL:
		case SMB2_CLOSE:
		case SMB2_OPLOCK_BREAK:
			return -EAGAIN;
		}

		wait_event_interruptible_timeout(server->response_q,
			(server->tcpStatus != CifsNeedReconnect), 10 * HZ);

		/* are we still trying to reconnect? */
		if (server->tcpStatus != CifsNeedReconnect)
			break;

		/*
		 * on "soft" mounts we wait once. Hard mounts keep
		 * retrying until process is killed or server comes
		 * back on-line
		 */
		if (!tcon->retry) {
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			cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
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			return -EHOSTDOWN;
		}
	}

	if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
		return rc;

	nls_codepage = load_nls_default();

	/*
	 * need to prevent multiple threads trying to simultaneously reconnect
	 * the same SMB session
	 */
	mutex_lock(&tcon->ses->session_mutex);
	rc = cifs_negotiate_protocol(0, tcon->ses);
	if (!rc && tcon->ses->need_reconnect)
		rc = cifs_setup_session(0, tcon->ses, nls_codepage);

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

	cifs_mark_open_files_invalid(tcon);
	rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nls_codepage);
	mutex_unlock(&tcon->ses->session_mutex);
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	cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
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	if (rc)
		goto out;
	atomic_inc(&tconInfoReconnectCount);
	/*
	 * BB FIXME add code to check if wsize needs update due to negotiated
	 * smb buffer size shrinking.
	 */
out:
	/*
	 * Check if handle based operation so we know whether we can continue
	 * or not without returning to caller to reset file handle.
	 */
	/*
	 * BB Is flush done by server on drop of tcp session? Should we special
	 * case it and skip above?
	 */
	switch (smb2_command) {
	case SMB2_FLUSH:
	case SMB2_READ:
	case SMB2_WRITE:
	case SMB2_LOCK:
	case SMB2_IOCTL:
	case SMB2_QUERY_DIRECTORY:
	case SMB2_CHANGE_NOTIFY:
	case SMB2_QUERY_INFO:
	case SMB2_SET_INFO:
		return -EAGAIN;
	}
	unload_nls(nls_codepage);
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	return rc;
}

/*
 * Allocate and return pointer to an SMB request hdr, and set basic
 * SMB information in the SMB header. If the return code is zero, this
 * function must have filled in request_buf pointer.
 */
static int
small_smb2_init(__le16 smb2_command, struct cifs_tcon *tcon,
		void **request_buf)
{
	int rc = 0;

	rc = smb2_reconnect(smb2_command, tcon);
	if (rc)
		return rc;

	/* BB eventually switch this to SMB2 specific small buf size */
	*request_buf = cifs_small_buf_get();
	if (*request_buf == NULL) {
		/* BB should we add a retry in here if not a writepage? */
		return -ENOMEM;
	}

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

	if (tcon != NULL) {
#ifdef CONFIG_CIFS_STATS2
		uint16_t com_code = le16_to_cpu(smb2_command);
		cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
#endif
		cifs_stats_inc(&tcon->num_smbs_sent);
	}

	return rc;
}

static void
free_rsp_buf(int resp_buftype, void *rsp)
{
	if (resp_buftype == CIFS_SMALL_BUFFER)
		cifs_small_buf_release(rsp);
	else if (resp_buftype == CIFS_LARGE_BUFFER)
		cifs_buf_release(rsp);
}


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

int
SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
{
	struct smb2_negotiate_req *req;
	struct smb2_negotiate_rsp *rsp;
	struct kvec iov[1];
	int rc = 0;
	int resp_buftype;
	struct TCP_Server_Info *server;
	unsigned int sec_flags;
	u16 temp = 0;
	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 (ses->server)
		server = ses->server;
	else {
		rc = -EIO;
		return rc;
	}

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

	/* if any of auth flags (ie not sign or seal) are overriden use them */
	if (ses->overrideSecFlg & (~(CIFSSEC_MUST_SIGN | CIFSSEC_MUST_SEAL)))
		sec_flags = ses->overrideSecFlg;  /* BB FIXME fix sign flags?*/
	else /* if override flags set only sign/seal OR them with global auth */
		sec_flags = global_secflags | ses->overrideSecFlg;

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	cifs_dbg(FYI, "sec_flags 0x%x\n", sec_flags);
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	req->hdr.SessionId = 0;

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	req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
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	req->DialectCount = cpu_to_le16(1); /* One vers= at a time for now */
	inc_rfc1001_len(req, 2);
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	/* only one of SMB2 signing flags may be set in SMB2 request */
	if ((sec_flags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN)
		temp = SMB2_NEGOTIATE_SIGNING_REQUIRED;
	else if (sec_flags & CIFSSEC_MAY_SIGN) /* MAY_SIGN is a single flag */
		temp = SMB2_NEGOTIATE_SIGNING_ENABLED;

	req->SecurityMode = cpu_to_le16(temp);

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	req->Capabilities = cpu_to_le32(ses->server->vals->req_capabilities);
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	memcpy(req->ClientGUID, cifs_client_guid, SMB2_CLIENT_GUID_SIZE);

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

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

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

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

	server->maxBuf = le32_to_cpu(rsp->MaxTransactSize);
	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);
	if (blob_length == 0) {
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		cifs_dbg(VFS, "missing security blob on negprot\n");
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		rc = -EIO;
		goto neg_exit;
	}
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	cifs_dbg(FYI, "sec_flags 0x%x\n", sec_flags);
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	if ((sec_flags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN) {
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		cifs_dbg(FYI, "Signing required\n");
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		if (!(server->sec_mode & (SMB2_NEGOTIATE_SIGNING_REQUIRED |
		      SMB2_NEGOTIATE_SIGNING_ENABLED))) {
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			cifs_dbg(VFS, "signing required but server lacks support\n");
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			rc = -EOPNOTSUPP;
			goto neg_exit;
		}
		server->sec_mode |= SECMODE_SIGN_REQUIRED;
	} else if (sec_flags & CIFSSEC_MAY_SIGN) {
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		cifs_dbg(FYI, "Signing optional\n");
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		if (server->sec_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) {
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			cifs_dbg(FYI, "Server requires signing\n");
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			server->sec_mode |= SECMODE_SIGN_REQUIRED;
		} else {
			server->sec_mode &=
				~(SECMODE_SIGN_ENABLED | SECMODE_SIGN_REQUIRED);
		}
	} else {
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		cifs_dbg(FYI, "Signing disabled\n");
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		if (server->sec_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) {
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			cifs_dbg(VFS, "Server requires packet signing to be enabled in /proc/fs/cifs/SecurityFlags\n");
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			rc = -EOPNOTSUPP;
			goto neg_exit;
		}
		server->sec_mode &=
			~(SECMODE_SIGN_ENABLED | SECMODE_SIGN_REQUIRED);
	}

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#ifdef CONFIG_SMB2_ASN1  /* BB REMOVEME when updated asn1.c ready */
	rc = decode_neg_token_init(security_blob, blob_length,
				   &server->sec_type);
	if (rc == 1)
		rc = 0;
	else if (rc == 0) {
		rc = -EIO;
		goto neg_exit;
	}
#endif

neg_exit:
	free_rsp_buf(resp_buftype, rsp);
	return rc;
}
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int
SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
		const struct nls_table *nls_cp)
{
	struct smb2_sess_setup_req *req;
	struct smb2_sess_setup_rsp *rsp = NULL;
	struct kvec iov[2];
	int rc = 0;
	int resp_buftype;
	__le32 phase = NtLmNegotiate; /* NTLMSSP, if needed, is multistage */
	struct TCP_Server_Info *server;
	unsigned int sec_flags;
	u8 temp = 0;
	u16 blob_length = 0;
	char *security_blob;
	char *ntlmssp_blob = NULL;
	bool use_spnego = false; /* else use raw ntlmssp */

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	cifs_dbg(FYI, "Session Setup\n");
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	if (ses->server)
		server = ses->server;
	else {
		rc = -EIO;
		return rc;
	}

	/*
	 * If memory allocation is successful, caller of this function
	 * frees it.
	 */
	ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
	if (!ses->ntlmssp)
		return -ENOMEM;

	ses->server->secType = RawNTLMSSP;

ssetup_ntlmssp_authenticate:
	if (phase == NtLmChallenge)
		phase = NtLmAuthenticate; /* if ntlmssp, now final phase */

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

	/* if any of auth flags (ie not sign or seal) are overriden use them */
	if (ses->overrideSecFlg & (~(CIFSSEC_MUST_SIGN | CIFSSEC_MUST_SEAL)))
		sec_flags = ses->overrideSecFlg;  /* BB FIXME fix sign flags?*/
	else /* if override flags set only sign/seal OR them with global auth */
		sec_flags = global_secflags | ses->overrideSecFlg;

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	cifs_dbg(FYI, "sec_flags 0x%x\n", sec_flags);
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	req->hdr.SessionId = 0; /* First session, not a reauthenticate */
	req->VcNumber = 0; /* MBZ */
	/* to enable echos and oplocks */
	req->hdr.CreditRequest = cpu_to_le16(3);

	/* only one of SMB2 signing flags may be set in SMB2 request */
	if ((sec_flags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN)
		temp = SMB2_NEGOTIATE_SIGNING_REQUIRED;
	else if (ses->server->sec_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED)
		temp = SMB2_NEGOTIATE_SIGNING_REQUIRED;
	else if (sec_flags & CIFSSEC_MAY_SIGN) /* MAY_SIGN is a single flag */
		temp = SMB2_NEGOTIATE_SIGNING_ENABLED;

	req->SecurityMode = temp;
	req->Capabilities = 0;
	req->Channel = 0; /* MBZ */

	iov[0].iov_base = (char *)req;
	/* 4 for rfc1002 length field and 1 for pad */
	iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
	if (phase == NtLmNegotiate) {
		ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
				       GFP_KERNEL);
		if (ntlmssp_blob == NULL) {
			rc = -ENOMEM;
			goto ssetup_exit;
		}
		build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
		if (use_spnego) {
			/* blob_length = build_spnego_ntlmssp_blob(
					&security_blob,
					sizeof(struct _NEGOTIATE_MESSAGE),
					ntlmssp_blob); */
			/* BB eventually need to add this */
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			cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
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			rc = -EOPNOTSUPP;
			kfree(ntlmssp_blob);
			goto ssetup_exit;
		} else {
			blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
			/* with raw NTLMSSP we don't encapsulate in SPNEGO */
			security_blob = ntlmssp_blob;
		}
	} else if (phase == NtLmAuthenticate) {
		req->hdr.SessionId = ses->Suid;
		ntlmssp_blob = kzalloc(sizeof(struct _NEGOTIATE_MESSAGE) + 500,
				       GFP_KERNEL);
		if (ntlmssp_blob == NULL) {
			rc = -ENOMEM;
			goto ssetup_exit;
		}
		rc = build_ntlmssp_auth_blob(ntlmssp_blob, &blob_length, ses,
					     nls_cp);
		if (rc) {
580 581
			cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n",
				 rc);
582 583 584 585 586 587 588
			goto ssetup_exit; /* BB double check error handling */
		}
		if (use_spnego) {
			/* blob_length = build_spnego_ntlmssp_blob(
							&security_blob,
							blob_length,
							ntlmssp_blob); */
589
			cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
590 591 592 593 594 595 596
			rc = -EOPNOTSUPP;
			kfree(ntlmssp_blob);
			goto ssetup_exit;
		} else {
			security_blob = ntlmssp_blob;
		}
	} else {
597
		cifs_dbg(VFS, "illegal ntlmssp phase\n");
598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613
		rc = -EIO;
		goto ssetup_exit;
	}

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

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

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

614 615
	rc = SendReceive2(xid, ses, iov, 2, &resp_buftype,
			  CIFS_LOG_ERROR | CIFS_NEG_OP);
616 617 618

	kfree(security_blob);
	rsp = (struct smb2_sess_setup_rsp *)iov[0].iov_base;
619 620
	if (resp_buftype != CIFS_NO_BUFFER &&
	    rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED) {
621
		if (phase != NtLmNegotiate) {
622
			cifs_dbg(VFS, "Unexpected more processing error\n");
623 624 625
			goto ssetup_exit;
		}
		if (offsetof(struct smb2_sess_setup_rsp, Buffer) - 4 !=
626
				le16_to_cpu(rsp->SecurityBufferOffset)) {
627 628
			cifs_dbg(VFS, "Invalid security buffer offset %d\n",
				 le16_to_cpu(rsp->SecurityBufferOffset));
629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668
			rc = -EIO;
			goto ssetup_exit;
		}

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

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

	ses->session_flags = le16_to_cpu(rsp->SessionFlags);
ssetup_exit:
	free_rsp_buf(resp_buftype, rsp);

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

669
	cifs_dbg(FYI, "disconnect session %p\n", ses);
670 671 672 673 674 675 676 677 678 679 680 681

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

	rc = small_smb2_init(SMB2_LOGOFF, NULL, (void **) &req);
	if (rc)
		return rc;

	 /* since no tcon, smb2_init can not do this, so do here */
	req->hdr.SessionId = ses->Suid;
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	if (server->sec_mode & SECMODE_SIGN_REQUIRED)
		req->hdr.Flags |= SMB2_FLAGS_SIGNED;
684 685 686 687 688 689 690 691

	rc = SendReceiveNoRsp(xid, ses, (char *) &req->hdr, 0);
	/*
	 * No tcon so can't do
	 * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
	 */
	return rc;
}
692 693 694

static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
{
695
	cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712
}

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

int
SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
	  struct cifs_tcon *tcon, const struct nls_table *cp)
{
	struct smb2_tree_connect_req *req;
	struct smb2_tree_connect_rsp *rsp = NULL;
	struct kvec iov[2];
	int rc = 0;
	int resp_buftype;
	int unc_path_len;
	struct TCP_Server_Info *server;
	__le16 *unc_path = NULL;

713
	cifs_dbg(FYI, "TCON\n");
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

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

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

	unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
	if (unc_path == NULL)
		return -ENOMEM;

	unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
	unc_path_len *= 2;
	if (unc_path_len < 2) {
		kfree(unc_path);
		return -EINVAL;
	}

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

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

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

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

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

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

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

	if (tcon == NULL) {
		ses->ipc_tid = rsp->hdr.TreeId;
		goto tcon_exit;
	}

	if (rsp->ShareType & SMB2_SHARE_TYPE_DISK)
777
		cifs_dbg(FYI, "connection to disk share\n");
778 779
	else if (rsp->ShareType & SMB2_SHARE_TYPE_PIPE) {
		tcon->ipc = true;
780
		cifs_dbg(FYI, "connection to pipe share\n");
781 782
	} else if (rsp->ShareType & SMB2_SHARE_TYPE_PRINT) {
		tcon->print = true;
783
		cifs_dbg(FYI, "connection to printer\n");
784
	} else {
785
		cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
786 787 788 789 790 791 792 793 794 795 796 797 798
		rc = -EOPNOTSUPP;
		goto tcon_error_exit;
	}

	tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
	tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
	tcon->tidStatus = CifsGood;
	tcon->need_reconnect = false;
	tcon->tid = rsp->hdr.TreeId;
	strncpy(tcon->treeName, tree, MAX_TREE_SIZE);

	if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
	    ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
799
		cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
800 801 802 803 804 805 806 807

tcon_exit:
	free_rsp_buf(resp_buftype, rsp);
	kfree(unc_path);
	return rc;

tcon_error_exit:
	if (rsp->hdr.Status == STATUS_BAD_NETWORK_NAME) {
808
		cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
809 810 811 812 813 814 815 816 817 818 819 820 821
		tcon->bad_network_name = true;
	}
	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;

822
	cifs_dbg(FYI, "Tree Disconnect\n");
823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841

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

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

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

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

	return rc;
}
842

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static struct create_lease *
create_lease_buf(u8 *lease_key, u8 oplock)
{
	struct create_lease *buf;

848
	buf = kzalloc(sizeof(struct create_lease), GFP_KERNEL);
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	if (!buf)
		return NULL;

	buf->lcontext.LeaseKeyLow = cpu_to_le64(*((u64 *)lease_key));
	buf->lcontext.LeaseKeyHigh = cpu_to_le64(*((u64 *)(lease_key + 8)));
	if (oplock == SMB2_OPLOCK_LEVEL_EXCLUSIVE)
		buf->lcontext.LeaseState = SMB2_LEASE_WRITE_CACHING |
					   SMB2_LEASE_READ_CACHING;
	else if (oplock == SMB2_OPLOCK_LEVEL_II)
		buf->lcontext.LeaseState = SMB2_LEASE_READ_CACHING;
	else if (oplock == SMB2_OPLOCK_LEVEL_BATCH)
		buf->lcontext.LeaseState = SMB2_LEASE_HANDLE_CACHING |
					   SMB2_LEASE_READ_CACHING |
					   SMB2_LEASE_WRITE_CACHING;

	buf->ccontext.DataOffset = cpu_to_le16(offsetof
					(struct create_lease, lcontext));
	buf->ccontext.DataLength = cpu_to_le32(sizeof(struct lease_context));
	buf->ccontext.NameOffset = cpu_to_le16(offsetof
				(struct create_lease, Name));
	buf->ccontext.NameLength = cpu_to_le16(4);
	buf->Name[0] = 'R';
	buf->Name[1] = 'q';
	buf->Name[2] = 'L';
	buf->Name[3] = 's';
	return buf;
}

static __u8
parse_lease_state(struct smb2_create_rsp *rsp)
{
	char *data_offset;
	struct create_lease *lc;
	bool found = false;

	data_offset = (char *)rsp;
	data_offset += 4 + le32_to_cpu(rsp->CreateContextsOffset);
	lc = (struct create_lease *)data_offset;
	do {
		char *name = le16_to_cpu(lc->ccontext.NameOffset) + (char *)lc;
		if (le16_to_cpu(lc->ccontext.NameLength) != 4 ||
		    strncmp(name, "RqLs", 4)) {
			lc = (struct create_lease *)((char *)lc
					+ le32_to_cpu(lc->ccontext.Next));
			continue;
		}
		if (lc->lcontext.LeaseFlags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS)
			return SMB2_OPLOCK_LEVEL_NOCHANGE;
		found = true;
		break;
	} while (le32_to_cpu(lc->ccontext.Next) != 0);

	if (!found)
902
		return 0;
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904
	return smb2_map_lease_to_oplock(lc->lcontext.LeaseState);
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}

907 908 909
int
SMB2_open(const unsigned int xid, struct cifs_tcon *tcon, __le16 *path,
	  u64 *persistent_fid, u64 *volatile_fid, __u32 desired_access,
910
	  __u32 create_disposition, __u32 file_attributes, __u32 create_options,
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911
	  __u8 *oplock, struct smb2_file_all_info *buf)
912 913 914 915 916
{
	struct smb2_create_req *req;
	struct smb2_create_rsp *rsp;
	struct TCP_Server_Info *server;
	struct cifs_ses *ses = tcon->ses;
P
Pavel Shilovsky 已提交
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	struct kvec iov[3];
918 919
	int resp_buftype;
	int uni_path_len;
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920 921
	__le16 *copy_path = NULL;
	int copy_size;
922 923 924
	int rc = 0;
	int num_iovecs = 2;

925
	cifs_dbg(FYI, "create/open\n");
926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944

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

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

	req->ImpersonationLevel = IL_IMPERSONATION;
	req->DesiredAccess = cpu_to_le32(desired_access);
	/* File attributes ignored on open (used in create though) */
	req->FileAttributes = cpu_to_le32(file_attributes);
	req->ShareAccess = FILE_SHARE_ALL_LE;
	req->CreateDisposition = cpu_to_le32(create_disposition);
	req->CreateOptions = cpu_to_le32(create_options);
	uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
	req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req)
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			- 8 /* pad */ - 4 /* do not count rfc1001 len field */);
946 947 948 949 950 951 952 953 954 955

	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 */
	if (uni_path_len >= 4) {
		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--;
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956 957 958 959 960 961 962 963 964 965 966 967 968 969
		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;
		}

970 971 972 973 974 975 976 977
		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);
	} else {
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978 979 980
		iov[0].iov_len += 7;
		req->hdr.smb2_buf_length = cpu_to_be32(be32_to_cpu(
				req->hdr.smb2_buf_length) + 8 - 1);
981 982 983 984
		num_iovecs = 1;
		req->NameLength = 0;
	}

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985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008
	if (!server->oplocks)
		*oplock = SMB2_OPLOCK_LEVEL_NONE;

	if (!(tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
	    *oplock == SMB2_OPLOCK_LEVEL_NONE)
		req->RequestedOplockLevel = *oplock;
	else {
		iov[num_iovecs].iov_base = create_lease_buf(oplock+1, *oplock);
		if (iov[num_iovecs].iov_base == NULL) {
			cifs_small_buf_release(req);
			kfree(copy_path);
			return -ENOMEM;
		}
		iov[num_iovecs].iov_len = sizeof(struct create_lease);
		req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
		req->CreateContextsOffset = cpu_to_le32(
			sizeof(struct smb2_create_req) - 4 - 8 +
			iov[num_iovecs-1].iov_len);
		req->CreateContextsLength = cpu_to_le32(
			sizeof(struct create_lease));
		inc_rfc1001_len(&req->hdr, sizeof(struct create_lease));
		num_iovecs++;
	}

1009 1010 1011 1012 1013 1014 1015 1016 1017 1018
	rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
	rsp = (struct smb2_create_rsp *)iov[0].iov_base;

	if (rc != 0) {
		cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
		goto creat_exit;
	}

	*persistent_fid = rsp->PersistentFileId;
	*volatile_fid = rsp->VolatileFileId;
1019 1020 1021 1022 1023 1024 1025 1026 1027

	if (buf) {
		memcpy(buf, &rsp->CreationTime, 32);
		buf->AllocationSize = rsp->AllocationSize;
		buf->EndOfFile = rsp->EndofFile;
		buf->Attributes = rsp->FileAttributes;
		buf->NumberOfLinks = cpu_to_le32(1);
		buf->DeletePending = 0;
	}
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	if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
		*oplock = parse_lease_state(rsp);
	else
		*oplock = rsp->OplockLevel;
1033
creat_exit:
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1034
	kfree(copy_path);
1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050
	free_rsp_buf(resp_buftype, rsp);
	return rc;
}

int
SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
	   u64 persistent_fid, u64 volatile_fid)
{
	struct smb2_close_req *req;
	struct smb2_close_rsp *rsp;
	struct TCP_Server_Info *server;
	struct cifs_ses *ses = tcon->ses;
	struct kvec iov[1];
	int resp_buftype;
	int rc = 0;

1051
	cifs_dbg(FYI, "Close\n");
1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083

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

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

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

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

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

	if (rc != 0) {
		if (tcon)
			cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
		goto close_exit;
	}

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

close_exit:
	free_rsp_buf(resp_buftype, rsp);
	return rc;
}
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1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096

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) {
1097 1098
		cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
			 buffer_length, min_buf_size);
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1099 1100 1101 1102 1103
		return -EINVAL;
	}

	/* check if beyond RFC1001 maximum length */
	if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
1104 1105
		cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
			 buffer_length, smb_len);
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1106 1107 1108 1109
		return -EINVAL;
	}

	if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
1110
		cifs_dbg(VFS, "illegal server response, bad offset to data\n");
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1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141
		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;
}

1142 1143 1144 1145
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)
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{
	struct smb2_query_info_req *req;
	struct smb2_query_info_rsp *rsp = NULL;
	struct kvec iov[2];
	int rc = 0;
	int resp_buftype;
	struct TCP_Server_Info *server;
	struct cifs_ses *ses = tcon->ses;

1155
	cifs_dbg(FYI, "Query Info\n");
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	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;
1167
	req->FileInfoClass = info_class;
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	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);
1173
	req->OutputBufferLength = cpu_to_le32(output_len);
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	iov[0].iov_base = (char *)req;
	/* 4 for rfc1002 length field */
	iov[0].iov_len = get_rfc1002_length(req) + 4;

	rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1180 1181
	rsp = (struct smb2_query_info_rsp *)iov[0].iov_base;

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	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),
1189
				   &rsp->hdr, min_len, data);
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qinf_exit:
	free_rsp_buf(resp_buftype, rsp);
	return rc;
}
1195

1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216
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,
			  sizeof(struct smb2_file_all_info) + MAX_NAME * 2,
			  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);
}

1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243
/*
 * This is a no-op for now. We're not really interested in the reply, but
 * rather in the fact that the server sent one and that server->lstrp
 * gets updated.
 *
 * FIXME: maybe we should consider checking that the reply matches request?
 */
static void
smb2_echo_callback(struct mid_q_entry *mid)
{
	struct TCP_Server_Info *server = mid->callback_data;
	struct smb2_echo_rsp *smb2 = (struct smb2_echo_rsp *)mid->resp_buf;
	unsigned int credits_received = 1;

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

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

int
SMB2_echo(struct TCP_Server_Info *server)
{
	struct smb2_echo_req *req;
	int rc = 0;
	struct kvec iov;
1244 1245
	struct smb_rqst rqst = { .rq_iov = &iov,
				 .rq_nvec = 1 };
1246

1247
	cifs_dbg(FYI, "In echo request\n");
1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258

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

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

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

1259
	rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, server,
1260 1261
			     CIFS_ECHO_OP);
	if (rc)
1262
		cifs_dbg(FYI, "Echo request failed: %d\n", rc);
1263 1264 1265 1266

	cifs_small_buf_release(req);
	return rc;
}
1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278

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

1279
	cifs_dbg(FYI, "Flush\n");
1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304

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

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

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

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

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

	if ((rc != 0) && tcon)
		cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);

	free_rsp_buf(resp_buftype, iov[0].iov_base);
	return rc;
}
1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369

/*
 * To form a chain of read requests, any read requests after the first should
 * have the end_of_chain boolean set to true.
 */
static int
smb2_new_read_req(struct kvec *iov, struct cifs_io_parms *io_parms,
		  unsigned int remaining_bytes, int request_type)
{
	int rc = -EACCES;
	struct smb2_read_req *req = NULL;

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

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

	req->PersistentFileId = io_parms->persistent_fid;
	req->VolatileFileId = io_parms->volatile_fid;
	req->ReadChannelInfoOffset = 0; /* reserved */
	req->ReadChannelInfoLength = 0; /* reserved */
	req->Channel = 0; /* reserved */
	req->MinimumCount = 0;
	req->Length = cpu_to_le32(io_parms->length);
	req->Offset = cpu_to_le64(io_parms->offset);

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

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

static void
smb2_readv_callback(struct mid_q_entry *mid)
{
	struct cifs_readdata *rdata = mid->callback_data;
	struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
	struct TCP_Server_Info *server = tcon->ses->server;
1370
	struct smb2_hdr *buf = (struct smb2_hdr *)rdata->iov.iov_base;
1371
	unsigned int credits_received = 1;
1372
	struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1373 1374 1375 1376 1377
				 .rq_nvec = 1,
				 .rq_pages = rdata->pages,
				 .rq_npages = rdata->nr_pages,
				 .rq_pagesz = rdata->pagesz,
				 .rq_tailsz = rdata->tailsz };
1378

1379 1380 1381
	cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
		 __func__, mid->mid, mid->mid_state, rdata->result,
		 rdata->bytes);
1382 1383 1384 1385 1386

	switch (mid->mid_state) {
	case MID_RESPONSE_RECEIVED:
		credits_received = le16_to_cpu(buf->CreditRequest);
		/* result already set, check signature */
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		if (server->sec_mode &
		    (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) {
			int rc;

1391
			rc = smb2_verify_signature(&rqst, server);
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			if (rc)
1393 1394
				cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
					 rc);
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		}
1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423
		/* FIXME: should this be counted toward the initiating task? */
		task_io_account_read(rdata->bytes);
		cifs_stats_bytes_read(tcon, rdata->bytes);
		break;
	case MID_REQUEST_SUBMITTED:
	case MID_RETRY_NEEDED:
		rdata->result = -EAGAIN;
		break;
	default:
		if (rdata->result != -ENODATA)
			rdata->result = -EIO;
	}

	if (rdata->result)
		cifs_stats_fail_inc(tcon, SMB2_READ_HE);

	queue_work(cifsiod_wq, &rdata->work);
	DeleteMidQEntry(mid);
	add_credits(server, credits_received, 0);
}

/* smb2_async_readv - send an async write, and set up mid to handle result */
int
smb2_async_readv(struct cifs_readdata *rdata)
{
	int rc;
	struct smb2_hdr *buf;
	struct cifs_io_parms io_parms;
1424
	struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1425
				 .rq_nvec = 1 };
1426

1427 1428
	cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
		 __func__, rdata->offset, rdata->bytes);
1429 1430 1431 1432 1433 1434 1435

	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;
1436
	rc = smb2_new_read_req(&rdata->iov, &io_parms, 0, 0);
1437 1438 1439
	if (rc)
		return rc;

1440
	buf = (struct smb2_hdr *)rdata->iov.iov_base;
1441
	/* 4 for rfc1002 length field */
1442
	rdata->iov.iov_len = get_rfc1002_length(rdata->iov.iov_base) + 4;
1443 1444

	kref_get(&rdata->refcount);
1445
	rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
1446 1447
			     cifs_readv_receive, smb2_readv_callback,
			     rdata, 0);
1448
	if (rc) {
1449
		kref_put(&rdata->refcount, cifs_readdata_release);
1450 1451
		cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
	}
1452 1453 1454 1455

	cifs_small_buf_release(buf);
	return rc;
}
1456

1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481
int
SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
	  unsigned int *nbytes, char **buf, int *buf_type)
{
	int resp_buftype, rc = -EACCES;
	struct smb2_read_rsp *rsp = NULL;
	struct kvec iov[1];

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

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

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

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

	if (rc) {
		cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
1482
		cifs_dbg(VFS, "Send error in read = %d\n", rc);
1483 1484 1485 1486
	} else {
		*nbytes = le32_to_cpu(rsp->DataLength);
		if ((*nbytes > CIFS_MAX_MSGSIZE) ||
		    (*nbytes > io_parms->length)) {
1487 1488
			cifs_dbg(FYI, "bad length %d for count %d\n",
				 *nbytes, io_parms->length);
1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507
			rc = -EIO;
			*nbytes = 0;
		}
	}

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

1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563
/*
 * Check the mid_state and signature on received buffer (if any), and queue the
 * workqueue completion task.
 */
static void
smb2_writev_callback(struct mid_q_entry *mid)
{
	struct cifs_writedata *wdata = mid->callback_data;
	struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
	unsigned int written;
	struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
	unsigned int credits_received = 1;

	switch (mid->mid_state) {
	case MID_RESPONSE_RECEIVED:
		credits_received = le16_to_cpu(rsp->hdr.CreditRequest);
		wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
		if (wdata->result != 0)
			break;

		written = le32_to_cpu(rsp->DataLength);
		/*
		 * Mask off high 16 bits when bytes written as returned
		 * by the server is greater than bytes requested by the
		 * client. OS/2 servers are known to set incorrect
		 * CountHigh values.
		 */
		if (written > wdata->bytes)
			written &= 0xFFFF;

		if (written < wdata->bytes)
			wdata->result = -ENOSPC;
		else
			wdata->bytes = written;
		break;
	case MID_REQUEST_SUBMITTED:
	case MID_RETRY_NEEDED:
		wdata->result = -EAGAIN;
		break;
	default:
		wdata->result = -EIO;
		break;
	}

	if (wdata->result)
		cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);

	queue_work(cifsiod_wq, &wdata->work);
	DeleteMidQEntry(mid);
	add_credits(tcon->ses->server, credits_received, 0);
}

/* smb2_async_writev - send an async write, and set up mid to handle result */
int
smb2_async_writev(struct cifs_writedata *wdata)
{
1564
	int rc = -EACCES;
1565 1566
	struct smb2_write_req *req = NULL;
	struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1567
	struct kvec iov;
1568
	struct smb_rqst rqst;
1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587

	rc = small_smb2_init(SMB2_WRITE, tcon, (void **) &req);
	if (rc)
		goto async_writev_out;

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

	req->PersistentFileId = wdata->cfile->fid.persistent_fid;
	req->VolatileFileId = wdata->cfile->fid.volatile_fid;
	req->WriteChannelInfoOffset = 0;
	req->WriteChannelInfoLength = 0;
	req->Channel = 0;
	req->Offset = cpu_to_le64(wdata->offset);
	/* 4 for rfc1002 length field */
	req->DataOffset = cpu_to_le16(
				offsetof(struct smb2_write_req, Buffer) - 4);
	req->RemainingBytes = 0;

	/* 4 for rfc1002 length field and 1 for Buffer */
1588 1589
	iov.iov_len = get_rfc1002_length(req) + 4 - 1;
	iov.iov_base = req;
1590

1591 1592 1593 1594 1595 1596
	rqst.rq_iov = &iov;
	rqst.rq_nvec = 1;
	rqst.rq_pages = wdata->pages;
	rqst.rq_npages = wdata->nr_pages;
	rqst.rq_pagesz = wdata->pagesz;
	rqst.rq_tailsz = wdata->tailsz;
1597

1598 1599
	cifs_dbg(FYI, "async write at %llu %u bytes\n",
		 wdata->offset, wdata->bytes);
1600 1601 1602 1603 1604 1605

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

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

	kref_get(&wdata->refcount);
1606 1607
	rc = cifs_call_async(tcon->ses->server, &rqst, NULL,
				smb2_writev_callback, wdata, 0);
1608

1609
	if (rc) {
1610
		kref_put(&wdata->refcount, cifs_writedata_release);
1611 1612
		cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
	}
1613 1614 1615 1616 1617

async_writev_out:
	cifs_small_buf_release(req);
	return rc;
}
1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667

/*
 * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
 * The length field from io_parms must be at least 1 and indicates a number of
 * elements with data to write that begins with position 1 in iov array. All
 * data length is specified by count.
 */
int
SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
	   unsigned int *nbytes, struct kvec *iov, int n_vec)
{
	int rc = 0;
	struct smb2_write_req *req = NULL;
	struct smb2_write_rsp *rsp = NULL;
	int resp_buftype;
	*nbytes = 0;

	if (n_vec < 1)
		return rc;

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

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

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

	req->PersistentFileId = io_parms->persistent_fid;
	req->VolatileFileId = io_parms->volatile_fid;
	req->WriteChannelInfoOffset = 0;
	req->WriteChannelInfoLength = 0;
	req->Channel = 0;
	req->Length = cpu_to_le32(io_parms->length);
	req->Offset = cpu_to_le64(io_parms->offset);
	/* 4 for rfc1002 length field */
	req->DataOffset = cpu_to_le16(
				offsetof(struct smb2_write_req, Buffer) - 4);
	req->RemainingBytes = 0;

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

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

	rc = SendReceive2(xid, io_parms->tcon->ses, iov, n_vec + 1,
			  &resp_buftype, 0);
1668
	rsp = (struct smb2_write_rsp *)iov[0].iov_base;
1669 1670 1671

	if (rc) {
		cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
1672
		cifs_dbg(VFS, "Send error in write = %d\n", rc);
1673
	} else
1674
		*nbytes = le32_to_cpu(rsp->DataLength);
1675 1676

	free_rsp_buf(resp_buftype, rsp);
1677 1678
	return rc;
}
1679

1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697
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) {
1698
			cifs_dbg(VFS, "malformed search entry would overflow\n");
1699 1700 1701 1702 1703
			break;
		}

		len = le32_to_cpu(entryptr->FileNameLength);
		if ((char *)entryptr + len + size > end_of_buf) {
1704 1705
			cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
				 end_of_buf);
1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760
			break;
		}

		*lastentry = (char *)entryptr;
		entrycount++;

		next_offset = le32_to_cpu(entryptr->NextEntryOffset);
		if (!next_offset)
			break;
	}

	return entrycount;
}

/*
 * Readdir/FindFirst
 */
int
SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
		     u64 persistent_fid, u64 volatile_fid, int index,
		     struct cifs_search_info *srch_inf)
{
	struct smb2_query_directory_req *req;
	struct smb2_query_directory_rsp *rsp = NULL;
	struct kvec iov[2];
	int rc = 0;
	int len;
	int resp_buftype;
	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:
1761 1762
		cifs_dbg(VFS, "info level %u isn't supported\n",
			 srch_inf->info_level);
1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795
		rc = -EINVAL;
		goto qdir_exit;
	}

	req->FileIndex = cpu_to_le32(index);
	req->PersistentFileId = persistent_fid;
	req->VolatileFileId = volatile_fid;

	len = 0x2;
	bufptr = req->Buffer;
	memcpy(bufptr, &asteriks, len);

	req->FileNameOffset =
		cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1 - 4);
	req->FileNameLength = cpu_to_le16(len);
	/*
	 * BB could be 30 bytes or so longer if we used SMB2 specific
	 * buffer lengths, but this is safe and close enough.
	 */
	output_size = min_t(unsigned int, output_size, server->maxBuf);
	output_size = min_t(unsigned int, output_size, 2 << 15);
	req->OutputBufferLength = cpu_to_le32(output_size);

	iov[0].iov_base = (char *)req;
	/* 4 for RFC1001 length and 1 for Buffer */
	iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;

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

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

	rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
1796 1797
	rsp = (struct smb2_query_directory_rsp *)iov[0].iov_base;

1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825
	if (rc) {
		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;
1826 1827 1828
	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);
1829 1830 1831 1832 1833
	if (resp_buftype == CIFS_LARGE_BUFFER)
		srch_inf->smallBuf = false;
	else if (resp_buftype == CIFS_SMALL_BUFFER)
		srch_inf->smallBuf = true;
	else
1834
		cifs_dbg(VFS, "illegal search buffer type\n");
1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847

	if (rsp->hdr.Status == STATUS_NO_MORE_FILES)
		srch_inf->endOfSearch = 1;
	else
		srch_inf->endOfSearch = 0;

	return rc;

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

1848 1849
static int
send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
1850
	       u64 persistent_fid, u64 volatile_fid, u32 pid, int info_class,
1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879
	       unsigned int num, void **data, unsigned int *size)
{
	struct smb2_set_info_req *req;
	struct smb2_set_info_rsp *rsp = NULL;
	struct kvec *iov;
	int rc = 0;
	int resp_buftype;
	unsigned int i;
	struct TCP_Server_Info *server;
	struct cifs_ses *ses = tcon->ses;

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

	if (!num)
		return -EINVAL;

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

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

1880 1881
	req->hdr.ProcessId = cpu_to_le32(pid);

1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945
	req->InfoType = SMB2_O_INFO_FILE;
	req->FileInfoClass = info_class;
	req->PersistentFileId = persistent_fid;
	req->VolatileFileId = volatile_fid;

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

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

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

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

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

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

	if (rc != 0) {
		cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
		goto out;
	}
out:
	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,
1946 1947
			   current->tgid, FILE_RENAME_INFORMATION, 2, data,
			   size);
1948 1949 1950
	kfree(data);
	return rc;
}
1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977

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,
1978
			   current->tgid, FILE_LINK_INFORMATION, 2, data, size);
1979 1980 1981
	kfree(data);
	return rc;
}
1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998

int
SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
	     u64 volatile_fid, u32 pid, __le64 *eof)
{
	struct smb2_file_eof_info info;
	void *data;
	unsigned int size;

	info.EndOfFile = *eof;

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

	return send_set_info(xid, tcon, persistent_fid, volatile_fid, pid,
			     FILE_END_OF_FILE_INFORMATION, 1, &data, &size);
}
1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009

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);
}
2010 2011 2012 2013 2014 2015 2016 2017 2018

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;

2019
	cifs_dbg(FYI, "SMB2_oplock_break\n");
2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034
	rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);

	if (rc)
		return rc;

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

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

	if (rc) {
		cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2035
		cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
2036 2037 2038 2039
	}

	return rc;
}
2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059

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;

2060
	cifs_dbg(FYI, "Query FSInfo level %d\n", level);
2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120

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

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

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

	iov->iov_base = (char *)req;
	/* 4 for rfc1002 length field */
	iov->iov_len = get_rfc1002_length(req) + 4;
	return 0;
}

int
SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
	      u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
{
	struct smb2_query_info_rsp *rsp = NULL;
	struct kvec iov;
	int rc = 0;
	int resp_buftype;
	struct cifs_ses *ses = tcon->ses;
	struct smb2_fs_full_size_info *info = NULL;

	rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
				sizeof(struct smb2_fs_full_size_info),
				persistent_fid, volatile_fid);
	if (rc)
		return rc;

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

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

qinf_exit:
	free_rsp_buf(resp_buftype, iov.iov_base);
	return rc;
}
2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132

int
smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
	   const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
	   const __u32 num_lock, struct smb2_lock_element *buf)
{
	int rc = 0;
	struct smb2_lock_req *req = NULL;
	struct kvec iov[2];
	int resp_buf_type;
	unsigned int count;

2133
	cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156

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

	req->hdr.ProcessId = cpu_to_le32(pid);
	req->LockCount = cpu_to_le16(num_lock);

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

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

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

	cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
	rc = SendReceive2(xid, tcon->ses, iov, 2, &resp_buf_type, CIFS_NO_RESP);
	if (rc) {
2157
		cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179
		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);
}
2180 2181 2182 2183 2184 2185 2186 2187

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;

2188
	cifs_dbg(FYI, "SMB2_lease_break\n");
2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205
	rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);

	if (rc)
		return rc;

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

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

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

	if (rc) {
		cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2206
		cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
2207 2208 2209 2210
	}

	return rc;
}