<commit_before>/*
 *   fs/cifs/sess.c
 *
 *   SMB/CIFS session setup handling routines
 *
 *   Copyright (c) International Business Machines  Corp., 2006, 2009
 *   Author(s): <NAME> (<EMAIL>)
 *
 *   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
 */

#include "cifspdu.h"
#include "cifsglob.h"
#include "cifsproto.h"
#include "cifs_unicode.h"
#include "cifs_debug.h"
#include "ntlmssp.h"
#include "nterr.h"
#include <linux/utsname.h>
#include <linux/slab.h>
#include "cifs_spnego.h"

/*
 * Checks if this is the first smb session to be reconnected after
 * the socket has been reestablished (so we know whether to use vc 0).
 * Called while holding the cifs_tcp_ses_lock, so do not block
 */
static bool is_first_ses_reconnect(struct cifs_ses *ses)
{
	struct list_head *tmp;
	struct cifs_ses *tmp_ses;

	list_for_each(tmp, &ses->server->smb_ses_list) {
		tmp_ses = list_entry(tmp, struct cifs_ses,
				     smb_ses_list);
		if (tmp_ses->need_reconnect == false)
			return false;
	}
	/* could not find a session that was already connected,
	   this must be the first one we are reconnecting */
	return true;
}

/*
 *	vc number 0 is treated specially by some servers, and should be the
 *      first one we request.  After that we can use vcnumbers up to maxvcs,
 *	one for each smb session (some Windows versions set maxvcs incorrectly
 *	so maxvc=1 can be ignored).  If we have too many vcs, we can reuse
 *	any vc but zero (some servers reset the connection on vcnum zero)
 *
 */
static __le16 get_next_vcnum(struct cifs_ses *ses)
{
	__u16 vcnum = 0;
	struct list_head *tmp;
	struct cifs_ses *tmp_ses;
	__u16 max_vcs = ses->server->max_vcs;
	__u16 i;
	int free_vc_found = 0;

	/* Quoting the MS-SMB specification: "Windows-based SMB servers set this
	field to one but do not enforce this limit, which allows an SMB client
	to establish more virtual circuits than allowed by this value ... but
	other server implementations can enforce this limit." */
	if (max_vcs < 2)
		max_vcs = 0xFFFF;

	spin_lock(&cifs_tcp_ses_lock);
	if ((ses->need_reconnect) && is_first_ses_reconnect(ses))
			goto get_vc_num_exit;  /* vcnum will be zero */
	for (i = ses->server->srv_count - 1; i < max_vcs; i++) {
		if (i == 0) /* this is the only connection, use vc 0 */
			break;

		free_vc_found = 1;

		list_for_each(tmp, &ses->server->smb_ses_list) {
			tmp_ses = list_entry(tmp, struct cifs_ses,
					     smb_ses_list);
			if (tmp_ses->vcnum == i) {
				free_vc_found = 0;
				break; /* found duplicate, try next vcnum */
			}
		}
		if (free_vc_found)
			break; /* we found a vcnumber that will work - use it */
	}

	if (i == 0)
		vcnum = 0; /* for most common case, ie if one smb session, use
			      vc zero.  Also for case when no free vcnum, zero
			      is safest to send (some clients only send zero) */
	else if (free_vc_found == 0)
		vcnum = 1;  /* we can not reuse vc=0 safely, since some servers
				reset all uids on that, but 1 is ok. */
	else
		vcnum = i;
	ses->vcnum = vcnum;
get_vc_num_exit:
	spin_unlock(&cifs_tcp_ses_lock);

	return cpu_to_le16(vcnum);
}

static __u32 cifs_ssetup_hdr(struct cifs_ses *ses, SESSION_SETUP_ANDX *pSMB)
{
	__u32 capabilities = 0;

	/* init fields common to all four types of SessSetup */
	/* Note that offsets for first seven fields in req struct are same  */
	/*	in CIFS Specs so does not matter which of 3 forms of struct */
	/*	that we use in next few lines                               */
	/* Note that header is initialized to zero in header_assemble */
	pSMB->req.AndXCommand = 0xFF;
	pSMB->req.MaxBufferSize = cpu_to_le16(ses->server->maxBuf);
	pSMB->req.MaxMpxCount = cpu_to_le16(ses->server->maxReq);
	pSMB->req.VcNumber = get_next_vcnum(ses);

	/* Now no need to set SMBFLG_CASELESS or obsolete CANONICAL PATH */

	/* BB verify whether signing required on neg or just on auth frame
	   (and NTLM case) */

	capabilities = CAP_LARGE_FILES | CAP_NT_SMBS | CAP_LEVEL_II_OPLOCKS |
			CAP_LARGE_WRITE_X | CAP_LARGE_READ_X;

	if (ses->server->sec_mode &
	    (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
		pSMB->req.hdr.Flags2 |= SMBFLG2_SECURITY_SIGNATURE;

	if (ses->capabilities & CAP_UNICODE) {
		pSMB->req.hdr.Flags2 |= SMBFLG2_UNICODE;
		capabilities |= CAP_UNICODE;
	}
	if (ses->capabilities & CAP_STATUS32) {
		pSMB->req.hdr.Flags2 |= SMBFLG2_ERR_STATUS;
		capabilities |= CAP_STATUS32;
	}
	if (ses->capabilities & CAP_DFS) {
		pSMB->req.hdr.Flags2 |= SMBFLG2_DFS;
		capabilities |= CAP_DFS;
	}
	if (ses->capabilities & CAP_UNIX)
		capabilities |= CAP_UNIX;

	return capabilities;<commit_msg>cifs: advertise the right receive buffer size to the server<commit_after>/*
 *   fs/cifs/sess.c
 *
 *   SMB/CIFS session setup handling routines
 *
 *   Copyright (c) International Business Machines  Corp., 2006, 2009
 *   Author(s): <NAME> (<EMAIL>)
 *
 *   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
 */

#include "cifspdu.h"
#include "cifsglob.h"
#include "cifsproto.h"
#include "cifs_unicode.h"
#include "cifs_debug.h"
#include "ntlmssp.h"
#include "nterr.h"
#include <linux/utsname.h>
#include <linux/slab.h>
#include "cifs_spnego.h"

/*
 * Checks if this is the first smb session to be reconnected after
 * the socket has been reestablished (so we know whether to use vc 0).
 * Called while holding the cifs_tcp_ses_lock, so do not block
 */
static bool is_first_ses_reconnect(struct cifs_ses *ses)
{
	struct list_head *tmp;
	struct cifs_ses *tmp_ses;

	list_for_each(tmp, &ses->server->smb_ses_list) {
		tmp_ses = list_entry(tmp, struct cifs_ses,
				     smb_ses_list);
		if (tmp_ses->need_reconnect == false)
			return false;
	}
	/* could not find a session that was already connected,
	   this must be the first one we are reconnecting */
	return true;
}

/*
 *	vc number 0 is treated specially by some servers, and should be the
 *      first one we request.  After that we can use vcnumbers up to maxvcs,
 *	one for each smb session (some Windows versions set maxvcs incorrectly
 *	so maxvc=1 can be ignored).  If we have too many vcs, we can reuse
 *	any vc but zero (some servers reset the connection on vcnum zero)
 *
 */
static __le16 get_next_vcnum(struct cifs_ses *ses)
{
	__u16 vcnum = 0;
	struct list_head *tmp;
	struct cifs_ses *tmp_ses;
	__u16 max_vcs = ses->server->max_vcs;
	__u16 i;
	int free_vc_found = 0;

	/* Quoting the MS-SMB specification: "Windows-based SMB servers set this
	field to one but do not enforce this limit, which allows an SMB client
	to establish more virtual circuits than allowed by this value ... but
	other server implementations can enforce this limit." */
	if (max_vcs < 2)
		max_vcs = 0xFFFF;

	spin_lock(&cifs_tcp_ses_lock);
	if ((ses->need_reconnect) && is_first_ses_reconnect(ses))
			goto get_vc_num_exit;  /* vcnum will be zero */
	for (i = ses->server->srv_count - 1; i < max_vcs; i++) {
		if (i == 0) /* this is the only connection, use vc 0 */
			break;

		free_vc_found = 1;

		list_for_each(tmp, &ses->server->smb_ses_list) {
			tmp_ses = list_entry(tmp, struct cifs_ses,
					     smb_ses_list);
			if (tmp_ses->vcnum == i) {
				free_vc_found = 0;
				break; /* found duplicate, try next vcnum */
			}
		}
		if (free_vc_found)
			break; /* we found a vcnumber that will work - use it */
	}

	if (i == 0)
		vcnum = 0; /* for most common case, ie if one smb session, use
			      vc zero.  Also for case when no free vcnum, zero
			      is safest to send (some clients only send zero) */
	else if (free_vc_found == 0)
		vcnum = 1;  /* we can not reuse vc=0 safely, since some servers
				reset all uids on that, but 1 is ok. */
	else
		vcnum = i;
	ses->vcnum = vcnum;
get_vc_num_exit:
	spin_unlock(&cifs_tcp_ses_lock);

	return cpu_to_le16(vcnum);
}

static __u32 cifs_ssetup_hdr(struct cifs_ses *ses, SESSION_SETUP_ANDX *pSMB)
{
	__u32 capabilities = 0;

	/* init fields common to all four types of SessSetup */
	/* Note that offsets for first seven fields in req struct are same  */
	/*	in CIFS Specs so does not matter which of 3 forms of struct */
	/*	that we use in next few lines                               */
	/* Note that header is initialized to zero in header_assemble */
	pSMB->req.AndXCommand = 0xFF;
	pSMB->req.MaxBufferSize = cpu_to_le16(min_t(u32, CIFSMaxBufSize - 4,
						USHRT_MAX));
	pSMB->req.MaxMpxCount = cpu_to_le16(ses->server->maxReq);
	pSMB->req.VcNumber = get_next_vcnum(ses);

	/* Now no need to set SMBFLG_CASELESS or obsolete CANONICAL PATH */

	/* BB verify whether signing required on neg or just on auth frame
	   (and NTLM case) */

	capabilities = CAP_LARGE_FILES | CAP_NT_SMBS | CAP_LEVEL_II_OPLOCKS |
			CAP_LARGE_WRITE_X | CAP_LARGE_READ_X;

	if (ses->server->sec_mode &
	    (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
		pSMB->req.hdr.Flags2 |= SMBFLG2_SECURITY_SIGNATURE;

	if (ses->capabilities & CAP_UNICODE) {
		pSMB->req.hdr.Flags2 |= SMBFLG2_UNICODE;
		capabilities |= CAP_UNICODE;
	}
	if (ses->capabilities & CAP_STATUS32) {
		pSMB->req.hdr.Flags2 |= SMBFLG2_ERR_STATUS;
		capabilities |= CAP_STATUS32;
	}
	if (ses->capabilities & CAP_DFS) {
		pSMB->req.hdr.Flags2 |= SMBFLG2_DFS;
		capabilities |= CAP_DFS;
	}
	if (ses->capabilities & CAP_UNIX)
		capabilities |= CAP_UNIX;

	return capabilities;
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