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8825736060
Reviewed-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Pavel Shilovsky <pshilovsky@samba.org> Signed-off-by: Steve French <sfrench@us.ibm.com>
4448 lines
115 KiB
C
4448 lines
115 KiB
C
/*
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* fs/cifs/connect.c
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*
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* Copyright (C) International Business Machines Corp., 2002,2011
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* Author(s): Steve French (sfrench@us.ibm.com)
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/fs.h>
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#include <linux/net.h>
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#include <linux/string.h>
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#include <linux/list.h>
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#include <linux/wait.h>
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#include <linux/slab.h>
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#include <linux/pagemap.h>
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#include <linux/ctype.h>
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#include <linux/utsname.h>
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#include <linux/mempool.h>
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#include <linux/delay.h>
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#include <linux/completion.h>
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#include <linux/kthread.h>
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#include <linux/pagevec.h>
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#include <linux/freezer.h>
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#include <linux/namei.h>
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#include <asm/uaccess.h>
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#include <asm/processor.h>
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#include <linux/inet.h>
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#include <linux/module.h>
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#include <keys/user-type.h>
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#include <net/ipv6.h>
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#include <linux/parser.h>
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#include "cifspdu.h"
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#include "cifsglob.h"
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#include "cifsproto.h"
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#include "cifs_unicode.h"
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#include "cifs_debug.h"
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#include "cifs_fs_sb.h"
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#include "ntlmssp.h"
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#include "nterr.h"
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#include "rfc1002pdu.h"
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#include "fscache.h"
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#define CIFS_PORT 445
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#define RFC1001_PORT 139
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/* SMB echo "timeout" -- FIXME: tunable? */
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#define SMB_ECHO_INTERVAL (60 * HZ)
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extern mempool_t *cifs_req_poolp;
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/* FIXME: should these be tunable? */
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#define TLINK_ERROR_EXPIRE (1 * HZ)
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#define TLINK_IDLE_EXPIRE (600 * HZ)
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enum {
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/* Mount options that take no arguments */
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Opt_user_xattr, Opt_nouser_xattr,
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Opt_forceuid, Opt_noforceuid,
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Opt_noblocksend, Opt_noautotune,
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Opt_hard, Opt_soft, Opt_perm, Opt_noperm,
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Opt_mapchars, Opt_nomapchars, Opt_sfu,
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Opt_nosfu, Opt_nodfs, Opt_posixpaths,
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Opt_noposixpaths, Opt_nounix,
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Opt_nocase,
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Opt_brl, Opt_nobrl,
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Opt_forcemandatorylock, Opt_setuids,
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Opt_nosetuids, Opt_dynperm, Opt_nodynperm,
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Opt_nohard, Opt_nosoft,
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Opt_nointr, Opt_intr,
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Opt_nostrictsync, Opt_strictsync,
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Opt_serverino, Opt_noserverino,
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Opt_rwpidforward, Opt_cifsacl, Opt_nocifsacl,
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Opt_acl, Opt_noacl, Opt_locallease,
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Opt_sign, Opt_seal, Opt_direct,
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Opt_strictcache, Opt_noac,
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Opt_fsc, Opt_mfsymlinks,
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Opt_multiuser, Opt_sloppy,
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/* Mount options which take numeric value */
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Opt_backupuid, Opt_backupgid, Opt_uid,
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Opt_cruid, Opt_gid, Opt_file_mode,
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Opt_dirmode, Opt_port,
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Opt_rsize, Opt_wsize, Opt_actimeo,
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/* Mount options which take string value */
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Opt_user, Opt_pass, Opt_ip,
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Opt_unc, Opt_domain,
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Opt_srcaddr, Opt_prefixpath,
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Opt_iocharset, Opt_sockopt,
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Opt_netbiosname, Opt_servern,
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Opt_ver, Opt_vers, Opt_sec, Opt_cache,
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/* Mount options to be ignored */
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Opt_ignore,
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/* Options which could be blank */
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Opt_blank_pass,
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Opt_blank_user,
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Opt_blank_ip,
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Opt_err
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};
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static const match_table_t cifs_mount_option_tokens = {
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{ Opt_user_xattr, "user_xattr" },
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{ Opt_nouser_xattr, "nouser_xattr" },
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{ Opt_forceuid, "forceuid" },
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{ Opt_noforceuid, "noforceuid" },
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{ Opt_noblocksend, "noblocksend" },
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{ Opt_noautotune, "noautotune" },
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{ Opt_hard, "hard" },
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{ Opt_soft, "soft" },
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{ Opt_perm, "perm" },
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{ Opt_noperm, "noperm" },
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{ Opt_mapchars, "mapchars" },
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{ Opt_nomapchars, "nomapchars" },
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{ Opt_sfu, "sfu" },
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{ Opt_nosfu, "nosfu" },
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{ Opt_nodfs, "nodfs" },
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{ Opt_posixpaths, "posixpaths" },
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{ Opt_noposixpaths, "noposixpaths" },
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{ Opt_nounix, "nounix" },
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{ Opt_nounix, "nolinux" },
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{ Opt_nocase, "nocase" },
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{ Opt_nocase, "ignorecase" },
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{ Opt_brl, "brl" },
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{ Opt_nobrl, "nobrl" },
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{ Opt_nobrl, "nolock" },
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{ Opt_forcemandatorylock, "forcemandatorylock" },
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{ Opt_forcemandatorylock, "forcemand" },
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{ Opt_setuids, "setuids" },
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{ Opt_nosetuids, "nosetuids" },
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{ Opt_dynperm, "dynperm" },
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{ Opt_nodynperm, "nodynperm" },
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{ Opt_nohard, "nohard" },
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{ Opt_nosoft, "nosoft" },
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{ Opt_nointr, "nointr" },
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{ Opt_intr, "intr" },
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{ Opt_nostrictsync, "nostrictsync" },
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{ Opt_strictsync, "strictsync" },
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{ Opt_serverino, "serverino" },
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{ Opt_noserverino, "noserverino" },
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{ Opt_rwpidforward, "rwpidforward" },
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{ Opt_cifsacl, "cifsacl" },
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{ Opt_nocifsacl, "nocifsacl" },
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{ Opt_acl, "acl" },
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{ Opt_noacl, "noacl" },
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{ Opt_locallease, "locallease" },
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{ Opt_sign, "sign" },
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{ Opt_seal, "seal" },
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{ Opt_direct, "direct" },
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{ Opt_direct, "directio" },
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{ Opt_direct, "forcedirectio" },
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{ Opt_strictcache, "strictcache" },
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{ Opt_noac, "noac" },
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{ Opt_fsc, "fsc" },
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{ Opt_mfsymlinks, "mfsymlinks" },
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{ Opt_multiuser, "multiuser" },
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{ Opt_sloppy, "sloppy" },
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{ Opt_backupuid, "backupuid=%s" },
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{ Opt_backupgid, "backupgid=%s" },
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{ Opt_uid, "uid=%s" },
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{ Opt_cruid, "cruid=%s" },
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{ Opt_gid, "gid=%s" },
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{ Opt_file_mode, "file_mode=%s" },
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{ Opt_dirmode, "dirmode=%s" },
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{ Opt_dirmode, "dir_mode=%s" },
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{ Opt_port, "port=%s" },
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{ Opt_rsize, "rsize=%s" },
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{ Opt_wsize, "wsize=%s" },
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{ Opt_actimeo, "actimeo=%s" },
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{ Opt_blank_user, "user=" },
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{ Opt_blank_user, "username=" },
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{ Opt_user, "user=%s" },
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{ Opt_user, "username=%s" },
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{ Opt_blank_pass, "pass=" },
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{ Opt_pass, "pass=%s" },
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{ Opt_pass, "password=%s" },
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{ Opt_blank_ip, "ip=" },
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{ Opt_blank_ip, "addr=" },
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{ Opt_ip, "ip=%s" },
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{ Opt_ip, "addr=%s" },
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{ Opt_unc, "unc=%s" },
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{ Opt_unc, "target=%s" },
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{ Opt_unc, "path=%s" },
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{ Opt_domain, "dom=%s" },
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{ Opt_domain, "domain=%s" },
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{ Opt_domain, "workgroup=%s" },
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{ Opt_srcaddr, "srcaddr=%s" },
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{ Opt_prefixpath, "prefixpath=%s" },
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{ Opt_iocharset, "iocharset=%s" },
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{ Opt_sockopt, "sockopt=%s" },
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{ Opt_netbiosname, "netbiosname=%s" },
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{ Opt_servern, "servern=%s" },
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{ Opt_ver, "ver=%s" },
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{ Opt_vers, "vers=%s" },
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{ Opt_sec, "sec=%s" },
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{ Opt_cache, "cache=%s" },
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{ Opt_ignore, "cred" },
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{ Opt_ignore, "credentials" },
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{ Opt_ignore, "cred=%s" },
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{ Opt_ignore, "credentials=%s" },
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{ Opt_ignore, "guest" },
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{ Opt_ignore, "rw" },
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{ Opt_ignore, "ro" },
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{ Opt_ignore, "suid" },
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{ Opt_ignore, "nosuid" },
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{ Opt_ignore, "exec" },
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{ Opt_ignore, "noexec" },
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{ Opt_ignore, "nodev" },
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{ Opt_ignore, "noauto" },
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{ Opt_ignore, "dev" },
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{ Opt_ignore, "mand" },
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{ Opt_ignore, "nomand" },
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{ Opt_ignore, "_netdev" },
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{ Opt_err, NULL }
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};
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enum {
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Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
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Opt_sec_ntlmsspi, Opt_sec_ntlmssp,
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Opt_ntlm, Opt_sec_ntlmi, Opt_sec_ntlmv2i,
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Opt_sec_nontlm, Opt_sec_lanman,
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Opt_sec_none,
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Opt_sec_err
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};
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static const match_table_t cifs_secflavor_tokens = {
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{ Opt_sec_krb5, "krb5" },
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{ Opt_sec_krb5i, "krb5i" },
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{ Opt_sec_krb5p, "krb5p" },
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{ Opt_sec_ntlmsspi, "ntlmsspi" },
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{ Opt_sec_ntlmssp, "ntlmssp" },
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{ Opt_ntlm, "ntlm" },
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{ Opt_sec_ntlmi, "ntlmi" },
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{ Opt_sec_ntlmv2i, "ntlmv2i" },
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{ Opt_sec_nontlm, "nontlm" },
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{ Opt_sec_lanman, "lanman" },
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{ Opt_sec_none, "none" },
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{ Opt_sec_err, NULL }
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};
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/* cache flavors */
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enum {
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Opt_cache_loose,
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Opt_cache_strict,
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Opt_cache_none,
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Opt_cache_err
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};
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static const match_table_t cifs_cacheflavor_tokens = {
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{ Opt_cache_loose, "loose" },
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{ Opt_cache_strict, "strict" },
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{ Opt_cache_none, "none" },
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{ Opt_cache_err, NULL }
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};
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static const match_table_t cifs_smb_version_tokens = {
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{ Smb_1, SMB1_VERSION_STRING },
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{ Smb_21, SMB21_VERSION_STRING },
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};
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static int ip_connect(struct TCP_Server_Info *server);
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static int generic_ip_connect(struct TCP_Server_Info *server);
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static void tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink);
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static void cifs_prune_tlinks(struct work_struct *work);
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static int cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
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const char *devname);
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/*
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* cifs tcp session reconnection
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*
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* mark tcp session as reconnecting so temporarily locked
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* mark all smb sessions as reconnecting for tcp session
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* reconnect tcp session
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* wake up waiters on reconnection? - (not needed currently)
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*/
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static int
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cifs_reconnect(struct TCP_Server_Info *server)
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{
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int rc = 0;
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struct list_head *tmp, *tmp2;
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struct cifs_ses *ses;
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struct cifs_tcon *tcon;
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struct mid_q_entry *mid_entry;
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struct list_head retry_list;
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spin_lock(&GlobalMid_Lock);
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if (server->tcpStatus == CifsExiting) {
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/* the demux thread will exit normally
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next time through the loop */
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spin_unlock(&GlobalMid_Lock);
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return rc;
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} else
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server->tcpStatus = CifsNeedReconnect;
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spin_unlock(&GlobalMid_Lock);
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server->maxBuf = 0;
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cFYI(1, "Reconnecting tcp session");
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/* before reconnecting the tcp session, mark the smb session (uid)
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and the tid bad so they are not used until reconnected */
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cFYI(1, "%s: marking sessions and tcons for reconnect", __func__);
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spin_lock(&cifs_tcp_ses_lock);
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list_for_each(tmp, &server->smb_ses_list) {
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ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
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ses->need_reconnect = true;
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ses->ipc_tid = 0;
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list_for_each(tmp2, &ses->tcon_list) {
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tcon = list_entry(tmp2, struct cifs_tcon, tcon_list);
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tcon->need_reconnect = true;
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}
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}
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spin_unlock(&cifs_tcp_ses_lock);
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/* do not want to be sending data on a socket we are freeing */
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cFYI(1, "%s: tearing down socket", __func__);
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mutex_lock(&server->srv_mutex);
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if (server->ssocket) {
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cFYI(1, "State: 0x%x Flags: 0x%lx", server->ssocket->state,
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server->ssocket->flags);
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kernel_sock_shutdown(server->ssocket, SHUT_WR);
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cFYI(1, "Post shutdown state: 0x%x Flags: 0x%lx",
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server->ssocket->state,
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server->ssocket->flags);
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sock_release(server->ssocket);
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server->ssocket = NULL;
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}
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server->sequence_number = 0;
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server->session_estab = false;
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kfree(server->session_key.response);
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server->session_key.response = NULL;
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server->session_key.len = 0;
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server->lstrp = jiffies;
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mutex_unlock(&server->srv_mutex);
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/* mark submitted MIDs for retry and issue callback */
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INIT_LIST_HEAD(&retry_list);
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cFYI(1, "%s: moving mids to private list", __func__);
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spin_lock(&GlobalMid_Lock);
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list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
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mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
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if (mid_entry->mid_state == MID_REQUEST_SUBMITTED)
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mid_entry->mid_state = MID_RETRY_NEEDED;
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list_move(&mid_entry->qhead, &retry_list);
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}
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spin_unlock(&GlobalMid_Lock);
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cFYI(1, "%s: issuing mid callbacks", __func__);
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list_for_each_safe(tmp, tmp2, &retry_list) {
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mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
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list_del_init(&mid_entry->qhead);
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mid_entry->callback(mid_entry);
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}
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do {
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try_to_freeze();
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/* we should try only the port we connected to before */
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rc = generic_ip_connect(server);
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if (rc) {
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cFYI(1, "reconnect error %d", rc);
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msleep(3000);
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} else {
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atomic_inc(&tcpSesReconnectCount);
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spin_lock(&GlobalMid_Lock);
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if (server->tcpStatus != CifsExiting)
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server->tcpStatus = CifsNeedNegotiate;
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spin_unlock(&GlobalMid_Lock);
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}
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} while (server->tcpStatus == CifsNeedReconnect);
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return rc;
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}
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/*
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return codes:
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0 not a transact2, or all data present
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>0 transact2 with that much data missing
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-EINVAL = invalid transact2
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*/
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static int check2ndT2(char *buf)
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{
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struct smb_hdr *pSMB = (struct smb_hdr *)buf;
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struct smb_t2_rsp *pSMBt;
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int remaining;
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__u16 total_data_size, data_in_this_rsp;
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if (pSMB->Command != SMB_COM_TRANSACTION2)
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return 0;
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/* check for plausible wct, bcc and t2 data and parm sizes */
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/* check for parm and data offset going beyond end of smb */
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if (pSMB->WordCount != 10) { /* coalesce_t2 depends on this */
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cFYI(1, "invalid transact2 word count");
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return -EINVAL;
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}
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pSMBt = (struct smb_t2_rsp *)pSMB;
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total_data_size = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount);
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data_in_this_rsp = get_unaligned_le16(&pSMBt->t2_rsp.DataCount);
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if (total_data_size == data_in_this_rsp)
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return 0;
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else if (total_data_size < data_in_this_rsp) {
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cFYI(1, "total data %d smaller than data in frame %d",
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total_data_size, data_in_this_rsp);
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return -EINVAL;
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}
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remaining = total_data_size - data_in_this_rsp;
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cFYI(1, "missing %d bytes from transact2, check next response",
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remaining);
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if (total_data_size > CIFSMaxBufSize) {
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cERROR(1, "TotalDataSize %d is over maximum buffer %d",
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total_data_size, CIFSMaxBufSize);
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return -EINVAL;
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}
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return remaining;
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}
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static int coalesce_t2(char *second_buf, struct smb_hdr *target_hdr)
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{
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struct smb_t2_rsp *pSMBs = (struct smb_t2_rsp *)second_buf;
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struct smb_t2_rsp *pSMBt = (struct smb_t2_rsp *)target_hdr;
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char *data_area_of_tgt;
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char *data_area_of_src;
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int remaining;
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unsigned int byte_count, total_in_tgt;
|
|
__u16 tgt_total_cnt, src_total_cnt, total_in_src;
|
|
|
|
src_total_cnt = get_unaligned_le16(&pSMBs->t2_rsp.TotalDataCount);
|
|
tgt_total_cnt = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount);
|
|
|
|
if (tgt_total_cnt != src_total_cnt)
|
|
cFYI(1, "total data count of primary and secondary t2 differ "
|
|
"source=%hu target=%hu", src_total_cnt, tgt_total_cnt);
|
|
|
|
total_in_tgt = get_unaligned_le16(&pSMBt->t2_rsp.DataCount);
|
|
|
|
remaining = tgt_total_cnt - total_in_tgt;
|
|
|
|
if (remaining < 0) {
|
|
cFYI(1, "Server sent too much data. tgt_total_cnt=%hu "
|
|
"total_in_tgt=%hu", tgt_total_cnt, total_in_tgt);
|
|
return -EPROTO;
|
|
}
|
|
|
|
if (remaining == 0) {
|
|
/* nothing to do, ignore */
|
|
cFYI(1, "no more data remains");
|
|
return 0;
|
|
}
|
|
|
|
total_in_src = get_unaligned_le16(&pSMBs->t2_rsp.DataCount);
|
|
if (remaining < total_in_src)
|
|
cFYI(1, "transact2 2nd response contains too much data");
|
|
|
|
/* find end of first SMB data area */
|
|
data_area_of_tgt = (char *)&pSMBt->hdr.Protocol +
|
|
get_unaligned_le16(&pSMBt->t2_rsp.DataOffset);
|
|
|
|
/* validate target area */
|
|
data_area_of_src = (char *)&pSMBs->hdr.Protocol +
|
|
get_unaligned_le16(&pSMBs->t2_rsp.DataOffset);
|
|
|
|
data_area_of_tgt += total_in_tgt;
|
|
|
|
total_in_tgt += total_in_src;
|
|
/* is the result too big for the field? */
|
|
if (total_in_tgt > USHRT_MAX) {
|
|
cFYI(1, "coalesced DataCount too large (%u)", total_in_tgt);
|
|
return -EPROTO;
|
|
}
|
|
put_unaligned_le16(total_in_tgt, &pSMBt->t2_rsp.DataCount);
|
|
|
|
/* fix up the BCC */
|
|
byte_count = get_bcc(target_hdr);
|
|
byte_count += total_in_src;
|
|
/* is the result too big for the field? */
|
|
if (byte_count > USHRT_MAX) {
|
|
cFYI(1, "coalesced BCC too large (%u)", byte_count);
|
|
return -EPROTO;
|
|
}
|
|
put_bcc(byte_count, target_hdr);
|
|
|
|
byte_count = be32_to_cpu(target_hdr->smb_buf_length);
|
|
byte_count += total_in_src;
|
|
/* don't allow buffer to overflow */
|
|
if (byte_count > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {
|
|
cFYI(1, "coalesced BCC exceeds buffer size (%u)", byte_count);
|
|
return -ENOBUFS;
|
|
}
|
|
target_hdr->smb_buf_length = cpu_to_be32(byte_count);
|
|
|
|
/* copy second buffer into end of first buffer */
|
|
memcpy(data_area_of_tgt, data_area_of_src, total_in_src);
|
|
|
|
if (remaining != total_in_src) {
|
|
/* more responses to go */
|
|
cFYI(1, "waiting for more secondary responses");
|
|
return 1;
|
|
}
|
|
|
|
/* we are done */
|
|
cFYI(1, "found the last secondary response");
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
cifs_echo_request(struct work_struct *work)
|
|
{
|
|
int rc;
|
|
struct TCP_Server_Info *server = container_of(work,
|
|
struct TCP_Server_Info, echo.work);
|
|
|
|
/*
|
|
* We cannot send an echo until the NEGOTIATE_PROTOCOL request is
|
|
* done, which is indicated by maxBuf != 0. Also, no need to ping if
|
|
* we got a response recently
|
|
*/
|
|
if (server->maxBuf == 0 ||
|
|
time_before(jiffies, server->lstrp + SMB_ECHO_INTERVAL - HZ))
|
|
goto requeue_echo;
|
|
|
|
rc = CIFSSMBEcho(server);
|
|
if (rc)
|
|
cFYI(1, "Unable to send echo request to server: %s",
|
|
server->hostname);
|
|
|
|
requeue_echo:
|
|
queue_delayed_work(cifsiod_wq, &server->echo, SMB_ECHO_INTERVAL);
|
|
}
|
|
|
|
static bool
|
|
allocate_buffers(struct TCP_Server_Info *server)
|
|
{
|
|
if (!server->bigbuf) {
|
|
server->bigbuf = (char *)cifs_buf_get();
|
|
if (!server->bigbuf) {
|
|
cERROR(1, "No memory for large SMB response");
|
|
msleep(3000);
|
|
/* retry will check if exiting */
|
|
return false;
|
|
}
|
|
} else if (server->large_buf) {
|
|
/* we are reusing a dirty large buf, clear its start */
|
|
memset(server->bigbuf, 0, HEADER_SIZE(server));
|
|
}
|
|
|
|
if (!server->smallbuf) {
|
|
server->smallbuf = (char *)cifs_small_buf_get();
|
|
if (!server->smallbuf) {
|
|
cERROR(1, "No memory for SMB response");
|
|
msleep(1000);
|
|
/* retry will check if exiting */
|
|
return false;
|
|
}
|
|
/* beginning of smb buffer is cleared in our buf_get */
|
|
} else {
|
|
/* if existing small buf clear beginning */
|
|
memset(server->smallbuf, 0, HEADER_SIZE(server));
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static bool
|
|
server_unresponsive(struct TCP_Server_Info *server)
|
|
{
|
|
/*
|
|
* We need to wait 2 echo intervals to make sure we handle such
|
|
* situations right:
|
|
* 1s client sends a normal SMB request
|
|
* 2s client gets a response
|
|
* 30s echo workqueue job pops, and decides we got a response recently
|
|
* and don't need to send another
|
|
* ...
|
|
* 65s kernel_recvmsg times out, and we see that we haven't gotten
|
|
* a response in >60s.
|
|
*/
|
|
if (server->tcpStatus == CifsGood &&
|
|
time_after(jiffies, server->lstrp + 2 * SMB_ECHO_INTERVAL)) {
|
|
cERROR(1, "Server %s has not responded in %d seconds. "
|
|
"Reconnecting...", server->hostname,
|
|
(2 * SMB_ECHO_INTERVAL) / HZ);
|
|
cifs_reconnect(server);
|
|
wake_up(&server->response_q);
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* kvec_array_init - clone a kvec array, and advance into it
|
|
* @new: pointer to memory for cloned array
|
|
* @iov: pointer to original array
|
|
* @nr_segs: number of members in original array
|
|
* @bytes: number of bytes to advance into the cloned array
|
|
*
|
|
* This function will copy the array provided in iov to a section of memory
|
|
* and advance the specified number of bytes into the new array. It returns
|
|
* the number of segments in the new array. "new" must be at least as big as
|
|
* the original iov array.
|
|
*/
|
|
static unsigned int
|
|
kvec_array_init(struct kvec *new, struct kvec *iov, unsigned int nr_segs,
|
|
size_t bytes)
|
|
{
|
|
size_t base = 0;
|
|
|
|
while (bytes || !iov->iov_len) {
|
|
int copy = min(bytes, iov->iov_len);
|
|
|
|
bytes -= copy;
|
|
base += copy;
|
|
if (iov->iov_len == base) {
|
|
iov++;
|
|
nr_segs--;
|
|
base = 0;
|
|
}
|
|
}
|
|
memcpy(new, iov, sizeof(*iov) * nr_segs);
|
|
new->iov_base += base;
|
|
new->iov_len -= base;
|
|
return nr_segs;
|
|
}
|
|
|
|
static struct kvec *
|
|
get_server_iovec(struct TCP_Server_Info *server, unsigned int nr_segs)
|
|
{
|
|
struct kvec *new_iov;
|
|
|
|
if (server->iov && nr_segs <= server->nr_iov)
|
|
return server->iov;
|
|
|
|
/* not big enough -- allocate a new one and release the old */
|
|
new_iov = kmalloc(sizeof(*new_iov) * nr_segs, GFP_NOFS);
|
|
if (new_iov) {
|
|
kfree(server->iov);
|
|
server->iov = new_iov;
|
|
server->nr_iov = nr_segs;
|
|
}
|
|
return new_iov;
|
|
}
|
|
|
|
int
|
|
cifs_readv_from_socket(struct TCP_Server_Info *server, struct kvec *iov_orig,
|
|
unsigned int nr_segs, unsigned int to_read)
|
|
{
|
|
int length = 0;
|
|
int total_read;
|
|
unsigned int segs;
|
|
struct msghdr smb_msg;
|
|
struct kvec *iov;
|
|
|
|
iov = get_server_iovec(server, nr_segs);
|
|
if (!iov)
|
|
return -ENOMEM;
|
|
|
|
smb_msg.msg_control = NULL;
|
|
smb_msg.msg_controllen = 0;
|
|
|
|
for (total_read = 0; to_read; total_read += length, to_read -= length) {
|
|
try_to_freeze();
|
|
|
|
if (server_unresponsive(server)) {
|
|
total_read = -EAGAIN;
|
|
break;
|
|
}
|
|
|
|
segs = kvec_array_init(iov, iov_orig, nr_segs, total_read);
|
|
|
|
length = kernel_recvmsg(server->ssocket, &smb_msg,
|
|
iov, segs, to_read, 0);
|
|
|
|
if (server->tcpStatus == CifsExiting) {
|
|
total_read = -ESHUTDOWN;
|
|
break;
|
|
} else if (server->tcpStatus == CifsNeedReconnect) {
|
|
cifs_reconnect(server);
|
|
total_read = -EAGAIN;
|
|
break;
|
|
} else if (length == -ERESTARTSYS ||
|
|
length == -EAGAIN ||
|
|
length == -EINTR) {
|
|
/*
|
|
* Minimum sleep to prevent looping, allowing socket
|
|
* to clear and app threads to set tcpStatus
|
|
* CifsNeedReconnect if server hung.
|
|
*/
|
|
usleep_range(1000, 2000);
|
|
length = 0;
|
|
continue;
|
|
} else if (length <= 0) {
|
|
cFYI(1, "Received no data or error: expecting %d "
|
|
"got %d", to_read, length);
|
|
cifs_reconnect(server);
|
|
total_read = -EAGAIN;
|
|
break;
|
|
}
|
|
}
|
|
return total_read;
|
|
}
|
|
|
|
int
|
|
cifs_read_from_socket(struct TCP_Server_Info *server, char *buf,
|
|
unsigned int to_read)
|
|
{
|
|
struct kvec iov;
|
|
|
|
iov.iov_base = buf;
|
|
iov.iov_len = to_read;
|
|
|
|
return cifs_readv_from_socket(server, &iov, 1, to_read);
|
|
}
|
|
|
|
static bool
|
|
is_smb_response(struct TCP_Server_Info *server, unsigned char type)
|
|
{
|
|
/*
|
|
* The first byte big endian of the length field,
|
|
* is actually not part of the length but the type
|
|
* with the most common, zero, as regular data.
|
|
*/
|
|
switch (type) {
|
|
case RFC1002_SESSION_MESSAGE:
|
|
/* Regular SMB response */
|
|
return true;
|
|
case RFC1002_SESSION_KEEP_ALIVE:
|
|
cFYI(1, "RFC 1002 session keep alive");
|
|
break;
|
|
case RFC1002_POSITIVE_SESSION_RESPONSE:
|
|
cFYI(1, "RFC 1002 positive session response");
|
|
break;
|
|
case RFC1002_NEGATIVE_SESSION_RESPONSE:
|
|
/*
|
|
* We get this from Windows 98 instead of an error on
|
|
* SMB negprot response.
|
|
*/
|
|
cFYI(1, "RFC 1002 negative session response");
|
|
/* give server a second to clean up */
|
|
msleep(1000);
|
|
/*
|
|
* Always try 445 first on reconnect since we get NACK
|
|
* on some if we ever connected to port 139 (the NACK
|
|
* is since we do not begin with RFC1001 session
|
|
* initialize frame).
|
|
*/
|
|
cifs_set_port((struct sockaddr *)&server->dstaddr, CIFS_PORT);
|
|
cifs_reconnect(server);
|
|
wake_up(&server->response_q);
|
|
break;
|
|
default:
|
|
cERROR(1, "RFC 1002 unknown response type 0x%x", type);
|
|
cifs_reconnect(server);
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
void
|
|
dequeue_mid(struct mid_q_entry *mid, bool malformed)
|
|
{
|
|
#ifdef CONFIG_CIFS_STATS2
|
|
mid->when_received = jiffies;
|
|
#endif
|
|
spin_lock(&GlobalMid_Lock);
|
|
if (!malformed)
|
|
mid->mid_state = MID_RESPONSE_RECEIVED;
|
|
else
|
|
mid->mid_state = MID_RESPONSE_MALFORMED;
|
|
list_del_init(&mid->qhead);
|
|
spin_unlock(&GlobalMid_Lock);
|
|
}
|
|
|
|
static void
|
|
handle_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server,
|
|
char *buf, int malformed)
|
|
{
|
|
if (malformed == 0 && check2ndT2(buf) > 0) {
|
|
mid->multiRsp = true;
|
|
if (mid->resp_buf) {
|
|
/* merge response - fix up 1st*/
|
|
malformed = coalesce_t2(buf, mid->resp_buf);
|
|
if (malformed > 0)
|
|
return;
|
|
|
|
/* All parts received or packet is malformed. */
|
|
mid->multiEnd = true;
|
|
return dequeue_mid(mid, malformed);
|
|
}
|
|
if (!server->large_buf) {
|
|
/*FIXME: switch to already allocated largebuf?*/
|
|
cERROR(1, "1st trans2 resp needs bigbuf");
|
|
} else {
|
|
/* Have first buffer */
|
|
mid->resp_buf = buf;
|
|
mid->large_buf = true;
|
|
server->bigbuf = NULL;
|
|
}
|
|
return;
|
|
}
|
|
mid->resp_buf = buf;
|
|
mid->large_buf = server->large_buf;
|
|
/* Was previous buf put in mpx struct for multi-rsp? */
|
|
if (!mid->multiRsp) {
|
|
/* smb buffer will be freed by user thread */
|
|
if (server->large_buf)
|
|
server->bigbuf = NULL;
|
|
else
|
|
server->smallbuf = NULL;
|
|
}
|
|
dequeue_mid(mid, malformed);
|
|
}
|
|
|
|
static void clean_demultiplex_info(struct TCP_Server_Info *server)
|
|
{
|
|
int length;
|
|
|
|
/* take it off the list, if it's not already */
|
|
spin_lock(&cifs_tcp_ses_lock);
|
|
list_del_init(&server->tcp_ses_list);
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
|
|
spin_lock(&GlobalMid_Lock);
|
|
server->tcpStatus = CifsExiting;
|
|
spin_unlock(&GlobalMid_Lock);
|
|
wake_up_all(&server->response_q);
|
|
|
|
/* check if we have blocked requests that need to free */
|
|
spin_lock(&server->req_lock);
|
|
if (server->credits <= 0)
|
|
server->credits = 1;
|
|
spin_unlock(&server->req_lock);
|
|
/*
|
|
* Although there should not be any requests blocked on this queue it
|
|
* can not hurt to be paranoid and try to wake up requests that may
|
|
* haven been blocked when more than 50 at time were on the wire to the
|
|
* same server - they now will see the session is in exit state and get
|
|
* out of SendReceive.
|
|
*/
|
|
wake_up_all(&server->request_q);
|
|
/* give those requests time to exit */
|
|
msleep(125);
|
|
|
|
if (server->ssocket) {
|
|
sock_release(server->ssocket);
|
|
server->ssocket = NULL;
|
|
}
|
|
|
|
if (!list_empty(&server->pending_mid_q)) {
|
|
struct list_head dispose_list;
|
|
struct mid_q_entry *mid_entry;
|
|
struct list_head *tmp, *tmp2;
|
|
|
|
INIT_LIST_HEAD(&dispose_list);
|
|
spin_lock(&GlobalMid_Lock);
|
|
list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
|
|
mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
|
|
cFYI(1, "Clearing mid 0x%llx", mid_entry->mid);
|
|
mid_entry->mid_state = MID_SHUTDOWN;
|
|
list_move(&mid_entry->qhead, &dispose_list);
|
|
}
|
|
spin_unlock(&GlobalMid_Lock);
|
|
|
|
/* now walk dispose list and issue callbacks */
|
|
list_for_each_safe(tmp, tmp2, &dispose_list) {
|
|
mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
|
|
cFYI(1, "Callback mid 0x%llx", mid_entry->mid);
|
|
list_del_init(&mid_entry->qhead);
|
|
mid_entry->callback(mid_entry);
|
|
}
|
|
/* 1/8th of sec is more than enough time for them to exit */
|
|
msleep(125);
|
|
}
|
|
|
|
if (!list_empty(&server->pending_mid_q)) {
|
|
/*
|
|
* mpx threads have not exited yet give them at least the smb
|
|
* send timeout time for long ops.
|
|
*
|
|
* Due to delays on oplock break requests, we need to wait at
|
|
* least 45 seconds before giving up on a request getting a
|
|
* response and going ahead and killing cifsd.
|
|
*/
|
|
cFYI(1, "Wait for exit from demultiplex thread");
|
|
msleep(46000);
|
|
/*
|
|
* If threads still have not exited they are probably never
|
|
* coming home not much else we can do but free the memory.
|
|
*/
|
|
}
|
|
|
|
kfree(server->hostname);
|
|
kfree(server->iov);
|
|
kfree(server);
|
|
|
|
length = atomic_dec_return(&tcpSesAllocCount);
|
|
if (length > 0)
|
|
mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
|
|
GFP_KERNEL);
|
|
}
|
|
|
|
static int
|
|
standard_receive3(struct TCP_Server_Info *server, struct mid_q_entry *mid)
|
|
{
|
|
int length;
|
|
char *buf = server->smallbuf;
|
|
unsigned int pdu_length = get_rfc1002_length(buf);
|
|
|
|
/* make sure this will fit in a large buffer */
|
|
if (pdu_length > CIFSMaxBufSize + MAX_HEADER_SIZE(server) - 4) {
|
|
cERROR(1, "SMB response too long (%u bytes)",
|
|
pdu_length);
|
|
cifs_reconnect(server);
|
|
wake_up(&server->response_q);
|
|
return -EAGAIN;
|
|
}
|
|
|
|
/* switch to large buffer if too big for a small one */
|
|
if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
|
|
server->large_buf = true;
|
|
memcpy(server->bigbuf, buf, server->total_read);
|
|
buf = server->bigbuf;
|
|
}
|
|
|
|
/* now read the rest */
|
|
length = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1,
|
|
pdu_length - HEADER_SIZE(server) + 1 + 4);
|
|
if (length < 0)
|
|
return length;
|
|
server->total_read += length;
|
|
|
|
dump_smb(buf, server->total_read);
|
|
|
|
/*
|
|
* We know that we received enough to get to the MID as we
|
|
* checked the pdu_length earlier. Now check to see
|
|
* if the rest of the header is OK. We borrow the length
|
|
* var for the rest of the loop to avoid a new stack var.
|
|
*
|
|
* 48 bytes is enough to display the header and a little bit
|
|
* into the payload for debugging purposes.
|
|
*/
|
|
length = server->ops->check_message(buf, server->total_read);
|
|
if (length != 0)
|
|
cifs_dump_mem("Bad SMB: ", buf,
|
|
min_t(unsigned int, server->total_read, 48));
|
|
|
|
if (!mid)
|
|
return length;
|
|
|
|
handle_mid(mid, server, buf, length);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
cifs_demultiplex_thread(void *p)
|
|
{
|
|
int length;
|
|
struct TCP_Server_Info *server = p;
|
|
unsigned int pdu_length;
|
|
char *buf = NULL;
|
|
struct task_struct *task_to_wake = NULL;
|
|
struct mid_q_entry *mid_entry;
|
|
|
|
current->flags |= PF_MEMALLOC;
|
|
cFYI(1, "Demultiplex PID: %d", task_pid_nr(current));
|
|
|
|
length = atomic_inc_return(&tcpSesAllocCount);
|
|
if (length > 1)
|
|
mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
|
|
GFP_KERNEL);
|
|
|
|
set_freezable();
|
|
while (server->tcpStatus != CifsExiting) {
|
|
if (try_to_freeze())
|
|
continue;
|
|
|
|
if (!allocate_buffers(server))
|
|
continue;
|
|
|
|
server->large_buf = false;
|
|
buf = server->smallbuf;
|
|
pdu_length = 4; /* enough to get RFC1001 header */
|
|
|
|
length = cifs_read_from_socket(server, buf, pdu_length);
|
|
if (length < 0)
|
|
continue;
|
|
server->total_read = length;
|
|
|
|
/*
|
|
* The right amount was read from socket - 4 bytes,
|
|
* so we can now interpret the length field.
|
|
*/
|
|
pdu_length = get_rfc1002_length(buf);
|
|
|
|
cFYI(1, "RFC1002 header 0x%x", pdu_length);
|
|
if (!is_smb_response(server, buf[0]))
|
|
continue;
|
|
|
|
/* make sure we have enough to get to the MID */
|
|
if (pdu_length < HEADER_SIZE(server) - 1 - 4) {
|
|
cERROR(1, "SMB response too short (%u bytes)",
|
|
pdu_length);
|
|
cifs_reconnect(server);
|
|
wake_up(&server->response_q);
|
|
continue;
|
|
}
|
|
|
|
/* read down to the MID */
|
|
length = cifs_read_from_socket(server, buf + 4,
|
|
HEADER_SIZE(server) - 1 - 4);
|
|
if (length < 0)
|
|
continue;
|
|
server->total_read += length;
|
|
|
|
mid_entry = server->ops->find_mid(server, buf);
|
|
|
|
if (!mid_entry || !mid_entry->receive)
|
|
length = standard_receive3(server, mid_entry);
|
|
else
|
|
length = mid_entry->receive(server, mid_entry);
|
|
|
|
if (length < 0)
|
|
continue;
|
|
|
|
if (server->large_buf)
|
|
buf = server->bigbuf;
|
|
|
|
server->lstrp = jiffies;
|
|
if (mid_entry != NULL) {
|
|
if (!mid_entry->multiRsp || mid_entry->multiEnd)
|
|
mid_entry->callback(mid_entry);
|
|
} else if (!server->ops->is_oplock_break ||
|
|
!server->ops->is_oplock_break(buf, server)) {
|
|
cERROR(1, "No task to wake, unknown frame received! "
|
|
"NumMids %d", atomic_read(&midCount));
|
|
cifs_dump_mem("Received Data is: ", buf,
|
|
HEADER_SIZE(server));
|
|
#ifdef CONFIG_CIFS_DEBUG2
|
|
if (server->ops->dump_detail)
|
|
server->ops->dump_detail(buf);
|
|
cifs_dump_mids(server);
|
|
#endif /* CIFS_DEBUG2 */
|
|
|
|
}
|
|
} /* end while !EXITING */
|
|
|
|
/* buffer usually freed in free_mid - need to free it here on exit */
|
|
cifs_buf_release(server->bigbuf);
|
|
if (server->smallbuf) /* no sense logging a debug message if NULL */
|
|
cifs_small_buf_release(server->smallbuf);
|
|
|
|
task_to_wake = xchg(&server->tsk, NULL);
|
|
clean_demultiplex_info(server);
|
|
|
|
/* if server->tsk was NULL then wait for a signal before exiting */
|
|
if (!task_to_wake) {
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
while (!signal_pending(current)) {
|
|
schedule();
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
}
|
|
set_current_state(TASK_RUNNING);
|
|
}
|
|
|
|
module_put_and_exit(0);
|
|
}
|
|
|
|
/* extract the host portion of the UNC string */
|
|
static char *
|
|
extract_hostname(const char *unc)
|
|
{
|
|
const char *src;
|
|
char *dst, *delim;
|
|
unsigned int len;
|
|
|
|
/* skip double chars at beginning of string */
|
|
/* BB: check validity of these bytes? */
|
|
src = unc + 2;
|
|
|
|
/* delimiter between hostname and sharename is always '\\' now */
|
|
delim = strchr(src, '\\');
|
|
if (!delim)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
len = delim - src;
|
|
dst = kmalloc((len + 1), GFP_KERNEL);
|
|
if (dst == NULL)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
memcpy(dst, src, len);
|
|
dst[len] = '\0';
|
|
|
|
return dst;
|
|
}
|
|
|
|
static int get_option_ul(substring_t args[], unsigned long *option)
|
|
{
|
|
int rc;
|
|
char *string;
|
|
|
|
string = match_strdup(args);
|
|
if (string == NULL)
|
|
return -ENOMEM;
|
|
rc = kstrtoul(string, 0, option);
|
|
kfree(string);
|
|
|
|
return rc;
|
|
}
|
|
|
|
|
|
static int cifs_parse_security_flavors(char *value,
|
|
struct smb_vol *vol)
|
|
{
|
|
|
|
substring_t args[MAX_OPT_ARGS];
|
|
|
|
switch (match_token(value, cifs_secflavor_tokens, args)) {
|
|
case Opt_sec_krb5:
|
|
vol->secFlg |= CIFSSEC_MAY_KRB5;
|
|
break;
|
|
case Opt_sec_krb5i:
|
|
vol->secFlg |= CIFSSEC_MAY_KRB5 | CIFSSEC_MUST_SIGN;
|
|
break;
|
|
case Opt_sec_krb5p:
|
|
/* vol->secFlg |= CIFSSEC_MUST_SEAL | CIFSSEC_MAY_KRB5; */
|
|
cERROR(1, "Krb5 cifs privacy not supported");
|
|
break;
|
|
case Opt_sec_ntlmssp:
|
|
vol->secFlg |= CIFSSEC_MAY_NTLMSSP;
|
|
break;
|
|
case Opt_sec_ntlmsspi:
|
|
vol->secFlg |= CIFSSEC_MAY_NTLMSSP | CIFSSEC_MUST_SIGN;
|
|
break;
|
|
case Opt_ntlm:
|
|
/* ntlm is default so can be turned off too */
|
|
vol->secFlg |= CIFSSEC_MAY_NTLM;
|
|
break;
|
|
case Opt_sec_ntlmi:
|
|
vol->secFlg |= CIFSSEC_MAY_NTLM | CIFSSEC_MUST_SIGN;
|
|
break;
|
|
case Opt_sec_nontlm:
|
|
vol->secFlg |= CIFSSEC_MAY_NTLMV2;
|
|
break;
|
|
case Opt_sec_ntlmv2i:
|
|
vol->secFlg |= CIFSSEC_MAY_NTLMV2 | CIFSSEC_MUST_SIGN;
|
|
break;
|
|
#ifdef CONFIG_CIFS_WEAK_PW_HASH
|
|
case Opt_sec_lanman:
|
|
vol->secFlg |= CIFSSEC_MAY_LANMAN;
|
|
break;
|
|
#endif
|
|
case Opt_sec_none:
|
|
vol->nullauth = 1;
|
|
break;
|
|
default:
|
|
cERROR(1, "bad security option: %s", value);
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
cifs_parse_cache_flavor(char *value, struct smb_vol *vol)
|
|
{
|
|
substring_t args[MAX_OPT_ARGS];
|
|
|
|
switch (match_token(value, cifs_cacheflavor_tokens, args)) {
|
|
case Opt_cache_loose:
|
|
vol->direct_io = false;
|
|
vol->strict_io = false;
|
|
break;
|
|
case Opt_cache_strict:
|
|
vol->direct_io = false;
|
|
vol->strict_io = true;
|
|
break;
|
|
case Opt_cache_none:
|
|
vol->direct_io = true;
|
|
vol->strict_io = false;
|
|
break;
|
|
default:
|
|
cERROR(1, "bad cache= option: %s", value);
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
cifs_parse_smb_version(char *value, struct smb_vol *vol)
|
|
{
|
|
substring_t args[MAX_OPT_ARGS];
|
|
|
|
switch (match_token(value, cifs_smb_version_tokens, args)) {
|
|
case Smb_1:
|
|
vol->ops = &smb1_operations;
|
|
vol->vals = &smb1_values;
|
|
break;
|
|
#ifdef CONFIG_CIFS_SMB2
|
|
case Smb_21:
|
|
vol->ops = &smb21_operations;
|
|
vol->vals = &smb21_values;
|
|
break;
|
|
#endif
|
|
default:
|
|
cERROR(1, "Unknown vers= option specified: %s", value);
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
cifs_parse_mount_options(const char *mountdata, const char *devname,
|
|
struct smb_vol *vol)
|
|
{
|
|
char *data, *end;
|
|
char *mountdata_copy = NULL, *options;
|
|
unsigned int temp_len, i, j;
|
|
char separator[2];
|
|
short int override_uid = -1;
|
|
short int override_gid = -1;
|
|
bool uid_specified = false;
|
|
bool gid_specified = false;
|
|
bool sloppy = false;
|
|
char *invalid = NULL;
|
|
char *nodename = utsname()->nodename;
|
|
char *string = NULL;
|
|
char *tmp_end, *value;
|
|
char delim;
|
|
bool cache_specified = false;
|
|
static bool cache_warned = false;
|
|
|
|
separator[0] = ',';
|
|
separator[1] = 0;
|
|
delim = separator[0];
|
|
|
|
/*
|
|
* does not have to be perfect mapping since field is
|
|
* informational, only used for servers that do not support
|
|
* port 445 and it can be overridden at mount time
|
|
*/
|
|
memset(vol->source_rfc1001_name, 0x20, RFC1001_NAME_LEN);
|
|
for (i = 0; i < strnlen(nodename, RFC1001_NAME_LEN); i++)
|
|
vol->source_rfc1001_name[i] = toupper(nodename[i]);
|
|
|
|
vol->source_rfc1001_name[RFC1001_NAME_LEN] = 0;
|
|
/* null target name indicates to use *SMBSERVR default called name
|
|
if we end up sending RFC1001 session initialize */
|
|
vol->target_rfc1001_name[0] = 0;
|
|
vol->cred_uid = current_uid();
|
|
vol->linux_uid = current_uid();
|
|
vol->linux_gid = current_gid();
|
|
|
|
/* default to only allowing write access to owner of the mount */
|
|
vol->dir_mode = vol->file_mode = S_IRUGO | S_IXUGO | S_IWUSR;
|
|
|
|
/* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */
|
|
/* default is always to request posix paths. */
|
|
vol->posix_paths = 1;
|
|
/* default to using server inode numbers where available */
|
|
vol->server_ino = 1;
|
|
|
|
vol->actimeo = CIFS_DEF_ACTIMEO;
|
|
|
|
/* FIXME: add autonegotiation -- for now, SMB1 is default */
|
|
vol->ops = &smb1_operations;
|
|
vol->vals = &smb1_values;
|
|
|
|
if (!mountdata)
|
|
goto cifs_parse_mount_err;
|
|
|
|
mountdata_copy = kstrndup(mountdata, PAGE_SIZE, GFP_KERNEL);
|
|
if (!mountdata_copy)
|
|
goto cifs_parse_mount_err;
|
|
|
|
options = mountdata_copy;
|
|
end = options + strlen(options);
|
|
|
|
if (strncmp(options, "sep=", 4) == 0) {
|
|
if (options[4] != 0) {
|
|
separator[0] = options[4];
|
|
options += 5;
|
|
} else {
|
|
cFYI(1, "Null separator not allowed");
|
|
}
|
|
}
|
|
vol->backupuid_specified = false; /* no backup intent for a user */
|
|
vol->backupgid_specified = false; /* no backup intent for a group */
|
|
|
|
while ((data = strsep(&options, separator)) != NULL) {
|
|
substring_t args[MAX_OPT_ARGS];
|
|
unsigned long option;
|
|
int token;
|
|
|
|
if (!*data)
|
|
continue;
|
|
|
|
token = match_token(data, cifs_mount_option_tokens, args);
|
|
|
|
switch (token) {
|
|
|
|
/* Ingnore the following */
|
|
case Opt_ignore:
|
|
break;
|
|
|
|
/* Boolean values */
|
|
case Opt_user_xattr:
|
|
vol->no_xattr = 0;
|
|
break;
|
|
case Opt_nouser_xattr:
|
|
vol->no_xattr = 1;
|
|
break;
|
|
case Opt_forceuid:
|
|
override_uid = 1;
|
|
break;
|
|
case Opt_noforceuid:
|
|
override_uid = 0;
|
|
break;
|
|
case Opt_noblocksend:
|
|
vol->noblocksnd = 1;
|
|
break;
|
|
case Opt_noautotune:
|
|
vol->noautotune = 1;
|
|
break;
|
|
case Opt_hard:
|
|
vol->retry = 1;
|
|
break;
|
|
case Opt_soft:
|
|
vol->retry = 0;
|
|
break;
|
|
case Opt_perm:
|
|
vol->noperm = 0;
|
|
break;
|
|
case Opt_noperm:
|
|
vol->noperm = 1;
|
|
break;
|
|
case Opt_mapchars:
|
|
vol->remap = 1;
|
|
break;
|
|
case Opt_nomapchars:
|
|
vol->remap = 0;
|
|
break;
|
|
case Opt_sfu:
|
|
vol->sfu_emul = 1;
|
|
break;
|
|
case Opt_nosfu:
|
|
vol->sfu_emul = 0;
|
|
break;
|
|
case Opt_nodfs:
|
|
vol->nodfs = 1;
|
|
break;
|
|
case Opt_posixpaths:
|
|
vol->posix_paths = 1;
|
|
break;
|
|
case Opt_noposixpaths:
|
|
vol->posix_paths = 0;
|
|
break;
|
|
case Opt_nounix:
|
|
vol->no_linux_ext = 1;
|
|
break;
|
|
case Opt_nocase:
|
|
vol->nocase = 1;
|
|
break;
|
|
case Opt_brl:
|
|
vol->nobrl = 0;
|
|
break;
|
|
case Opt_nobrl:
|
|
vol->nobrl = 1;
|
|
/*
|
|
* turn off mandatory locking in mode
|
|
* if remote locking is turned off since the
|
|
* local vfs will do advisory
|
|
*/
|
|
if (vol->file_mode ==
|
|
(S_IALLUGO & ~(S_ISUID | S_IXGRP)))
|
|
vol->file_mode = S_IALLUGO;
|
|
break;
|
|
case Opt_forcemandatorylock:
|
|
vol->mand_lock = 1;
|
|
break;
|
|
case Opt_setuids:
|
|
vol->setuids = 1;
|
|
break;
|
|
case Opt_nosetuids:
|
|
vol->setuids = 0;
|
|
break;
|
|
case Opt_dynperm:
|
|
vol->dynperm = true;
|
|
break;
|
|
case Opt_nodynperm:
|
|
vol->dynperm = false;
|
|
break;
|
|
case Opt_nohard:
|
|
vol->retry = 0;
|
|
break;
|
|
case Opt_nosoft:
|
|
vol->retry = 1;
|
|
break;
|
|
case Opt_nointr:
|
|
vol->intr = 0;
|
|
break;
|
|
case Opt_intr:
|
|
vol->intr = 1;
|
|
break;
|
|
case Opt_nostrictsync:
|
|
vol->nostrictsync = 1;
|
|
break;
|
|
case Opt_strictsync:
|
|
vol->nostrictsync = 0;
|
|
break;
|
|
case Opt_serverino:
|
|
vol->server_ino = 1;
|
|
break;
|
|
case Opt_noserverino:
|
|
vol->server_ino = 0;
|
|
break;
|
|
case Opt_rwpidforward:
|
|
vol->rwpidforward = 1;
|
|
break;
|
|
case Opt_cifsacl:
|
|
vol->cifs_acl = 1;
|
|
break;
|
|
case Opt_nocifsacl:
|
|
vol->cifs_acl = 0;
|
|
break;
|
|
case Opt_acl:
|
|
vol->no_psx_acl = 0;
|
|
break;
|
|
case Opt_noacl:
|
|
vol->no_psx_acl = 1;
|
|
break;
|
|
case Opt_locallease:
|
|
vol->local_lease = 1;
|
|
break;
|
|
case Opt_sign:
|
|
vol->secFlg |= CIFSSEC_MUST_SIGN;
|
|
break;
|
|
case Opt_seal:
|
|
/* we do not do the following in secFlags because seal
|
|
* is a per tree connection (mount) not a per socket
|
|
* or per-smb connection option in the protocol
|
|
* vol->secFlg |= CIFSSEC_MUST_SEAL;
|
|
*/
|
|
vol->seal = 1;
|
|
break;
|
|
case Opt_direct:
|
|
cache_specified = true;
|
|
vol->direct_io = true;
|
|
vol->strict_io = false;
|
|
cERROR(1, "The \"directio\" option will be removed in "
|
|
"3.7. Please switch to the \"cache=none\" "
|
|
"option.");
|
|
break;
|
|
case Opt_strictcache:
|
|
cache_specified = true;
|
|
vol->direct_io = false;
|
|
vol->strict_io = true;
|
|
cERROR(1, "The \"strictcache\" option will be removed "
|
|
"in 3.7. Please switch to the \"cache=strict\" "
|
|
"option.");
|
|
break;
|
|
case Opt_noac:
|
|
printk(KERN_WARNING "CIFS: Mount option noac not "
|
|
"supported. Instead set "
|
|
"/proc/fs/cifs/LookupCacheEnabled to 0\n");
|
|
break;
|
|
case Opt_fsc:
|
|
#ifndef CONFIG_CIFS_FSCACHE
|
|
cERROR(1, "FS-Cache support needs CONFIG_CIFS_FSCACHE "
|
|
"kernel config option set");
|
|
goto cifs_parse_mount_err;
|
|
#endif
|
|
vol->fsc = true;
|
|
break;
|
|
case Opt_mfsymlinks:
|
|
vol->mfsymlinks = true;
|
|
break;
|
|
case Opt_multiuser:
|
|
vol->multiuser = true;
|
|
break;
|
|
case Opt_sloppy:
|
|
sloppy = true;
|
|
break;
|
|
|
|
/* Numeric Values */
|
|
case Opt_backupuid:
|
|
if (get_option_ul(args, &option)) {
|
|
cERROR(1, "%s: Invalid backupuid value",
|
|
__func__);
|
|
goto cifs_parse_mount_err;
|
|
}
|
|
vol->backupuid = option;
|
|
vol->backupuid_specified = true;
|
|
break;
|
|
case Opt_backupgid:
|
|
if (get_option_ul(args, &option)) {
|
|
cERROR(1, "%s: Invalid backupgid value",
|
|
__func__);
|
|
goto cifs_parse_mount_err;
|
|
}
|
|
vol->backupgid = option;
|
|
vol->backupgid_specified = true;
|
|
break;
|
|
case Opt_uid:
|
|
if (get_option_ul(args, &option)) {
|
|
cERROR(1, "%s: Invalid uid value",
|
|
__func__);
|
|
goto cifs_parse_mount_err;
|
|
}
|
|
vol->linux_uid = option;
|
|
uid_specified = true;
|
|
break;
|
|
case Opt_cruid:
|
|
if (get_option_ul(args, &option)) {
|
|
cERROR(1, "%s: Invalid cruid value",
|
|
__func__);
|
|
goto cifs_parse_mount_err;
|
|
}
|
|
vol->cred_uid = option;
|
|
break;
|
|
case Opt_gid:
|
|
if (get_option_ul(args, &option)) {
|
|
cERROR(1, "%s: Invalid gid value",
|
|
__func__);
|
|
goto cifs_parse_mount_err;
|
|
}
|
|
vol->linux_gid = option;
|
|
gid_specified = true;
|
|
break;
|
|
case Opt_file_mode:
|
|
if (get_option_ul(args, &option)) {
|
|
cERROR(1, "%s: Invalid file_mode value",
|
|
__func__);
|
|
goto cifs_parse_mount_err;
|
|
}
|
|
vol->file_mode = option;
|
|
break;
|
|
case Opt_dirmode:
|
|
if (get_option_ul(args, &option)) {
|
|
cERROR(1, "%s: Invalid dir_mode value",
|
|
__func__);
|
|
goto cifs_parse_mount_err;
|
|
}
|
|
vol->dir_mode = option;
|
|
break;
|
|
case Opt_port:
|
|
if (get_option_ul(args, &option)) {
|
|
cERROR(1, "%s: Invalid port value",
|
|
__func__);
|
|
goto cifs_parse_mount_err;
|
|
}
|
|
vol->port = option;
|
|
break;
|
|
case Opt_rsize:
|
|
if (get_option_ul(args, &option)) {
|
|
cERROR(1, "%s: Invalid rsize value",
|
|
__func__);
|
|
goto cifs_parse_mount_err;
|
|
}
|
|
vol->rsize = option;
|
|
break;
|
|
case Opt_wsize:
|
|
if (get_option_ul(args, &option)) {
|
|
cERROR(1, "%s: Invalid wsize value",
|
|
__func__);
|
|
goto cifs_parse_mount_err;
|
|
}
|
|
vol->wsize = option;
|
|
break;
|
|
case Opt_actimeo:
|
|
if (get_option_ul(args, &option)) {
|
|
cERROR(1, "%s: Invalid actimeo value",
|
|
__func__);
|
|
goto cifs_parse_mount_err;
|
|
}
|
|
vol->actimeo = HZ * option;
|
|
if (vol->actimeo > CIFS_MAX_ACTIMEO) {
|
|
cERROR(1, "CIFS: attribute cache"
|
|
"timeout too large");
|
|
goto cifs_parse_mount_err;
|
|
}
|
|
break;
|
|
|
|
/* String Arguments */
|
|
|
|
case Opt_blank_user:
|
|
/* null user, ie. anonymous authentication */
|
|
vol->nullauth = 1;
|
|
vol->username = NULL;
|
|
break;
|
|
case Opt_user:
|
|
string = match_strdup(args);
|
|
if (string == NULL)
|
|
goto out_nomem;
|
|
|
|
if (strnlen(string, MAX_USERNAME_SIZE) >
|
|
MAX_USERNAME_SIZE) {
|
|
printk(KERN_WARNING "CIFS: username too long\n");
|
|
goto cifs_parse_mount_err;
|
|
}
|
|
vol->username = kstrdup(string, GFP_KERNEL);
|
|
if (!vol->username) {
|
|
printk(KERN_WARNING "CIFS: no memory "
|
|
"for username\n");
|
|
goto cifs_parse_mount_err;
|
|
}
|
|
break;
|
|
case Opt_blank_pass:
|
|
vol->password = NULL;
|
|
break;
|
|
case Opt_pass:
|
|
/* passwords have to be handled differently
|
|
* to allow the character used for deliminator
|
|
* to be passed within them
|
|
*/
|
|
|
|
/* Obtain the value string */
|
|
value = strchr(data, '=');
|
|
value++;
|
|
|
|
/* Set tmp_end to end of the string */
|
|
tmp_end = (char *) value + strlen(value);
|
|
|
|
/* Check if following character is the deliminator
|
|
* If yes, we have encountered a double deliminator
|
|
* reset the NULL character to the deliminator
|
|
*/
|
|
if (tmp_end < end && tmp_end[1] == delim)
|
|
tmp_end[0] = delim;
|
|
|
|
/* Keep iterating until we get to a single deliminator
|
|
* OR the end
|
|
*/
|
|
while ((tmp_end = strchr(tmp_end, delim)) != NULL &&
|
|
(tmp_end[1] == delim)) {
|
|
tmp_end = (char *) &tmp_end[2];
|
|
}
|
|
|
|
/* Reset var options to point to next element */
|
|
if (tmp_end) {
|
|
tmp_end[0] = '\0';
|
|
options = (char *) &tmp_end[1];
|
|
} else
|
|
/* Reached the end of the mount option string */
|
|
options = end;
|
|
|
|
/* Now build new password string */
|
|
temp_len = strlen(value);
|
|
vol->password = kzalloc(temp_len+1, GFP_KERNEL);
|
|
if (vol->password == NULL) {
|
|
printk(KERN_WARNING "CIFS: no memory "
|
|
"for password\n");
|
|
goto cifs_parse_mount_err;
|
|
}
|
|
|
|
for (i = 0, j = 0; i < temp_len; i++, j++) {
|
|
vol->password[j] = value[i];
|
|
if ((value[i] == delim) &&
|
|
value[i+1] == delim)
|
|
/* skip the second deliminator */
|
|
i++;
|
|
}
|
|
vol->password[j] = '\0';
|
|
break;
|
|
case Opt_blank_ip:
|
|
vol->UNCip = NULL;
|
|
break;
|
|
case Opt_ip:
|
|
string = match_strdup(args);
|
|
if (string == NULL)
|
|
goto out_nomem;
|
|
|
|
if (strnlen(string, INET6_ADDRSTRLEN) >
|
|
INET6_ADDRSTRLEN) {
|
|
printk(KERN_WARNING "CIFS: ip address "
|
|
"too long\n");
|
|
goto cifs_parse_mount_err;
|
|
}
|
|
vol->UNCip = kstrdup(string, GFP_KERNEL);
|
|
if (!vol->UNCip) {
|
|
printk(KERN_WARNING "CIFS: no memory "
|
|
"for UNC IP\n");
|
|
goto cifs_parse_mount_err;
|
|
}
|
|
break;
|
|
case Opt_unc:
|
|
string = match_strdup(args);
|
|
if (string == NULL)
|
|
goto out_nomem;
|
|
|
|
temp_len = strnlen(string, 300);
|
|
if (temp_len == 300) {
|
|
printk(KERN_WARNING "CIFS: UNC name too long\n");
|
|
goto cifs_parse_mount_err;
|
|
}
|
|
|
|
vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
|
|
if (vol->UNC == NULL) {
|
|
printk(KERN_WARNING "CIFS: no memory for UNC\n");
|
|
goto cifs_parse_mount_err;
|
|
}
|
|
strcpy(vol->UNC, string);
|
|
|
|
if (strncmp(string, "//", 2) == 0) {
|
|
vol->UNC[0] = '\\';
|
|
vol->UNC[1] = '\\';
|
|
} else if (strncmp(string, "\\\\", 2) != 0) {
|
|
printk(KERN_WARNING "CIFS: UNC Path does not "
|
|
"begin with // or \\\\\n");
|
|
goto cifs_parse_mount_err;
|
|
}
|
|
|
|
break;
|
|
case Opt_domain:
|
|
string = match_strdup(args);
|
|
if (string == NULL)
|
|
goto out_nomem;
|
|
|
|
if (strnlen(string, 256) == 256) {
|
|
printk(KERN_WARNING "CIFS: domain name too"
|
|
" long\n");
|
|
goto cifs_parse_mount_err;
|
|
}
|
|
|
|
vol->domainname = kstrdup(string, GFP_KERNEL);
|
|
if (!vol->domainname) {
|
|
printk(KERN_WARNING "CIFS: no memory "
|
|
"for domainname\n");
|
|
goto cifs_parse_mount_err;
|
|
}
|
|
cFYI(1, "Domain name set");
|
|
break;
|
|
case Opt_srcaddr:
|
|
string = match_strdup(args);
|
|
if (string == NULL)
|
|
goto out_nomem;
|
|
|
|
if (!cifs_convert_address(
|
|
(struct sockaddr *)&vol->srcaddr,
|
|
string, strlen(string))) {
|
|
printk(KERN_WARNING "CIFS: Could not parse"
|
|
" srcaddr: %s\n", string);
|
|
goto cifs_parse_mount_err;
|
|
}
|
|
break;
|
|
case Opt_prefixpath:
|
|
string = match_strdup(args);
|
|
if (string == NULL)
|
|
goto out_nomem;
|
|
|
|
temp_len = strnlen(string, 1024);
|
|
if (string[0] != '/')
|
|
temp_len++; /* missing leading slash */
|
|
if (temp_len > 1024) {
|
|
printk(KERN_WARNING "CIFS: prefix too long\n");
|
|
goto cifs_parse_mount_err;
|
|
}
|
|
|
|
vol->prepath = kmalloc(temp_len+1, GFP_KERNEL);
|
|
if (vol->prepath == NULL) {
|
|
printk(KERN_WARNING "CIFS: no memory "
|
|
"for path prefix\n");
|
|
goto cifs_parse_mount_err;
|
|
}
|
|
|
|
if (string[0] != '/') {
|
|
vol->prepath[0] = '/';
|
|
strcpy(vol->prepath+1, string);
|
|
} else
|
|
strcpy(vol->prepath, string);
|
|
|
|
break;
|
|
case Opt_iocharset:
|
|
string = match_strdup(args);
|
|
if (string == NULL)
|
|
goto out_nomem;
|
|
|
|
if (strnlen(string, 1024) >= 65) {
|
|
printk(KERN_WARNING "CIFS: iocharset name "
|
|
"too long.\n");
|
|
goto cifs_parse_mount_err;
|
|
}
|
|
|
|
if (strnicmp(string, "default", 7) != 0) {
|
|
vol->iocharset = kstrdup(string,
|
|
GFP_KERNEL);
|
|
if (!vol->iocharset) {
|
|
printk(KERN_WARNING "CIFS: no memory"
|
|
"for charset\n");
|
|
goto cifs_parse_mount_err;
|
|
}
|
|
}
|
|
/* if iocharset not set then load_nls_default
|
|
* is used by caller
|
|
*/
|
|
cFYI(1, "iocharset set to %s", string);
|
|
break;
|
|
case Opt_sockopt:
|
|
string = match_strdup(args);
|
|
if (string == NULL)
|
|
goto out_nomem;
|
|
|
|
if (strnicmp(string, "TCP_NODELAY", 11) == 0)
|
|
vol->sockopt_tcp_nodelay = 1;
|
|
break;
|
|
case Opt_netbiosname:
|
|
string = match_strdup(args);
|
|
if (string == NULL)
|
|
goto out_nomem;
|
|
|
|
memset(vol->source_rfc1001_name, 0x20,
|
|
RFC1001_NAME_LEN);
|
|
/*
|
|
* FIXME: are there cases in which a comma can
|
|
* be valid in workstation netbios name (and
|
|
* need special handling)?
|
|
*/
|
|
for (i = 0; i < RFC1001_NAME_LEN; i++) {
|
|
/* don't ucase netbiosname for user */
|
|
if (string[i] == 0)
|
|
break;
|
|
vol->source_rfc1001_name[i] = string[i];
|
|
}
|
|
/* The string has 16th byte zero still from
|
|
* set at top of the function
|
|
*/
|
|
if (i == RFC1001_NAME_LEN && string[i] != 0)
|
|
printk(KERN_WARNING "CIFS: netbiosname"
|
|
" longer than 15 truncated.\n");
|
|
|
|
break;
|
|
case Opt_servern:
|
|
/* servernetbiosname specified override *SMBSERVER */
|
|
string = match_strdup(args);
|
|
if (string == NULL)
|
|
goto out_nomem;
|
|
|
|
/* last byte, type, is 0x20 for servr type */
|
|
memset(vol->target_rfc1001_name, 0x20,
|
|
RFC1001_NAME_LEN_WITH_NULL);
|
|
|
|
/* BB are there cases in which a comma can be
|
|
valid in this workstation netbios name
|
|
(and need special handling)? */
|
|
|
|
/* user or mount helper must uppercase the
|
|
netbios name */
|
|
for (i = 0; i < 15; i++) {
|
|
if (string[i] == 0)
|
|
break;
|
|
vol->target_rfc1001_name[i] = string[i];
|
|
}
|
|
/* The string has 16th byte zero still from
|
|
set at top of the function */
|
|
if (i == RFC1001_NAME_LEN && string[i] != 0)
|
|
printk(KERN_WARNING "CIFS: server net"
|
|
"biosname longer than 15 truncated.\n");
|
|
break;
|
|
case Opt_ver:
|
|
string = match_strdup(args);
|
|
if (string == NULL)
|
|
goto out_nomem;
|
|
|
|
if (strnicmp(string, "1", 1) == 0) {
|
|
/* This is the default */
|
|
break;
|
|
}
|
|
/* For all other value, error */
|
|
printk(KERN_WARNING "CIFS: Invalid version"
|
|
" specified\n");
|
|
goto cifs_parse_mount_err;
|
|
case Opt_vers:
|
|
string = match_strdup(args);
|
|
if (string == NULL)
|
|
goto out_nomem;
|
|
|
|
if (cifs_parse_smb_version(string, vol) != 0)
|
|
goto cifs_parse_mount_err;
|
|
break;
|
|
case Opt_sec:
|
|
string = match_strdup(args);
|
|
if (string == NULL)
|
|
goto out_nomem;
|
|
|
|
if (cifs_parse_security_flavors(string, vol) != 0)
|
|
goto cifs_parse_mount_err;
|
|
break;
|
|
case Opt_cache:
|
|
cache_specified = true;
|
|
string = match_strdup(args);
|
|
if (string == NULL)
|
|
goto out_nomem;
|
|
|
|
if (cifs_parse_cache_flavor(string, vol) != 0)
|
|
goto cifs_parse_mount_err;
|
|
break;
|
|
default:
|
|
/*
|
|
* An option we don't recognize. Save it off for later
|
|
* if we haven't already found one
|
|
*/
|
|
if (!invalid)
|
|
invalid = data;
|
|
break;
|
|
}
|
|
/* Free up any allocated string */
|
|
kfree(string);
|
|
string = NULL;
|
|
}
|
|
|
|
if (!sloppy && invalid) {
|
|
printk(KERN_ERR "CIFS: Unknown mount option \"%s\"\n", invalid);
|
|
goto cifs_parse_mount_err;
|
|
}
|
|
|
|
#ifndef CONFIG_KEYS
|
|
/* Muliuser mounts require CONFIG_KEYS support */
|
|
if (vol->multiuser) {
|
|
cERROR(1, "Multiuser mounts require kernels with "
|
|
"CONFIG_KEYS enabled.");
|
|
goto cifs_parse_mount_err;
|
|
}
|
|
#endif
|
|
|
|
if (vol->UNCip == NULL)
|
|
vol->UNCip = &vol->UNC[2];
|
|
|
|
if (uid_specified)
|
|
vol->override_uid = override_uid;
|
|
else if (override_uid == 1)
|
|
printk(KERN_NOTICE "CIFS: ignoring forceuid mount option "
|
|
"specified with no uid= option.\n");
|
|
|
|
if (gid_specified)
|
|
vol->override_gid = override_gid;
|
|
else if (override_gid == 1)
|
|
printk(KERN_NOTICE "CIFS: ignoring forcegid mount option "
|
|
"specified with no gid= option.\n");
|
|
|
|
/* FIXME: remove this block in 3.7 */
|
|
if (!cache_specified && !cache_warned) {
|
|
cache_warned = true;
|
|
printk(KERN_NOTICE "CIFS: no cache= option specified, using "
|
|
"\"cache=loose\". This default will change "
|
|
"to \"cache=strict\" in 3.7.\n");
|
|
}
|
|
|
|
kfree(mountdata_copy);
|
|
return 0;
|
|
|
|
out_nomem:
|
|
printk(KERN_WARNING "Could not allocate temporary buffer\n");
|
|
cifs_parse_mount_err:
|
|
kfree(string);
|
|
kfree(mountdata_copy);
|
|
return 1;
|
|
}
|
|
|
|
/** Returns true if srcaddr isn't specified and rhs isn't
|
|
* specified, or if srcaddr is specified and
|
|
* matches the IP address of the rhs argument.
|
|
*/
|
|
static bool
|
|
srcip_matches(struct sockaddr *srcaddr, struct sockaddr *rhs)
|
|
{
|
|
switch (srcaddr->sa_family) {
|
|
case AF_UNSPEC:
|
|
return (rhs->sa_family == AF_UNSPEC);
|
|
case AF_INET: {
|
|
struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr;
|
|
struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs;
|
|
return (saddr4->sin_addr.s_addr == vaddr4->sin_addr.s_addr);
|
|
}
|
|
case AF_INET6: {
|
|
struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr;
|
|
struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)&rhs;
|
|
return ipv6_addr_equal(&saddr6->sin6_addr, &vaddr6->sin6_addr);
|
|
}
|
|
default:
|
|
WARN_ON(1);
|
|
return false; /* don't expect to be here */
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If no port is specified in addr structure, we try to match with 445 port
|
|
* and if it fails - with 139 ports. It should be called only if address
|
|
* families of server and addr are equal.
|
|
*/
|
|
static bool
|
|
match_port(struct TCP_Server_Info *server, struct sockaddr *addr)
|
|
{
|
|
__be16 port, *sport;
|
|
|
|
switch (addr->sa_family) {
|
|
case AF_INET:
|
|
sport = &((struct sockaddr_in *) &server->dstaddr)->sin_port;
|
|
port = ((struct sockaddr_in *) addr)->sin_port;
|
|
break;
|
|
case AF_INET6:
|
|
sport = &((struct sockaddr_in6 *) &server->dstaddr)->sin6_port;
|
|
port = ((struct sockaddr_in6 *) addr)->sin6_port;
|
|
break;
|
|
default:
|
|
WARN_ON(1);
|
|
return false;
|
|
}
|
|
|
|
if (!port) {
|
|
port = htons(CIFS_PORT);
|
|
if (port == *sport)
|
|
return true;
|
|
|
|
port = htons(RFC1001_PORT);
|
|
}
|
|
|
|
return port == *sport;
|
|
}
|
|
|
|
static bool
|
|
match_address(struct TCP_Server_Info *server, struct sockaddr *addr,
|
|
struct sockaddr *srcaddr)
|
|
{
|
|
switch (addr->sa_family) {
|
|
case AF_INET: {
|
|
struct sockaddr_in *addr4 = (struct sockaddr_in *)addr;
|
|
struct sockaddr_in *srv_addr4 =
|
|
(struct sockaddr_in *)&server->dstaddr;
|
|
|
|
if (addr4->sin_addr.s_addr != srv_addr4->sin_addr.s_addr)
|
|
return false;
|
|
break;
|
|
}
|
|
case AF_INET6: {
|
|
struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
|
|
struct sockaddr_in6 *srv_addr6 =
|
|
(struct sockaddr_in6 *)&server->dstaddr;
|
|
|
|
if (!ipv6_addr_equal(&addr6->sin6_addr,
|
|
&srv_addr6->sin6_addr))
|
|
return false;
|
|
if (addr6->sin6_scope_id != srv_addr6->sin6_scope_id)
|
|
return false;
|
|
break;
|
|
}
|
|
default:
|
|
WARN_ON(1);
|
|
return false; /* don't expect to be here */
|
|
}
|
|
|
|
if (!srcip_matches(srcaddr, (struct sockaddr *)&server->srcaddr))
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
static bool
|
|
match_security(struct TCP_Server_Info *server, struct smb_vol *vol)
|
|
{
|
|
unsigned int secFlags;
|
|
|
|
if (vol->secFlg & (~(CIFSSEC_MUST_SIGN | CIFSSEC_MUST_SEAL)))
|
|
secFlags = vol->secFlg;
|
|
else
|
|
secFlags = global_secflags | vol->secFlg;
|
|
|
|
switch (server->secType) {
|
|
case LANMAN:
|
|
if (!(secFlags & (CIFSSEC_MAY_LANMAN|CIFSSEC_MAY_PLNTXT)))
|
|
return false;
|
|
break;
|
|
case NTLMv2:
|
|
if (!(secFlags & CIFSSEC_MAY_NTLMV2))
|
|
return false;
|
|
break;
|
|
case NTLM:
|
|
if (!(secFlags & CIFSSEC_MAY_NTLM))
|
|
return false;
|
|
break;
|
|
case Kerberos:
|
|
if (!(secFlags & CIFSSEC_MAY_KRB5))
|
|
return false;
|
|
break;
|
|
case RawNTLMSSP:
|
|
if (!(secFlags & CIFSSEC_MAY_NTLMSSP))
|
|
return false;
|
|
break;
|
|
default:
|
|
/* shouldn't happen */
|
|
return false;
|
|
}
|
|
|
|
/* now check if signing mode is acceptable */
|
|
if ((secFlags & CIFSSEC_MAY_SIGN) == 0 &&
|
|
(server->sec_mode & SECMODE_SIGN_REQUIRED))
|
|
return false;
|
|
else if (((secFlags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN) &&
|
|
(server->sec_mode &
|
|
(SECMODE_SIGN_ENABLED|SECMODE_SIGN_REQUIRED)) == 0)
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
static int match_server(struct TCP_Server_Info *server, struct sockaddr *addr,
|
|
struct smb_vol *vol)
|
|
{
|
|
if ((server->vals != vol->vals) || (server->ops != vol->ops))
|
|
return 0;
|
|
|
|
if (!net_eq(cifs_net_ns(server), current->nsproxy->net_ns))
|
|
return 0;
|
|
|
|
if (!match_address(server, addr,
|
|
(struct sockaddr *)&vol->srcaddr))
|
|
return 0;
|
|
|
|
if (!match_port(server, addr))
|
|
return 0;
|
|
|
|
if (!match_security(server, vol))
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
static struct TCP_Server_Info *
|
|
cifs_find_tcp_session(struct sockaddr *addr, struct smb_vol *vol)
|
|
{
|
|
struct TCP_Server_Info *server;
|
|
|
|
spin_lock(&cifs_tcp_ses_lock);
|
|
list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
|
|
if (!match_server(server, addr, vol))
|
|
continue;
|
|
|
|
++server->srv_count;
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
cFYI(1, "Existing tcp session with server found");
|
|
return server;
|
|
}
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
return NULL;
|
|
}
|
|
|
|
static void
|
|
cifs_put_tcp_session(struct TCP_Server_Info *server)
|
|
{
|
|
struct task_struct *task;
|
|
|
|
spin_lock(&cifs_tcp_ses_lock);
|
|
if (--server->srv_count > 0) {
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
return;
|
|
}
|
|
|
|
put_net(cifs_net_ns(server));
|
|
|
|
list_del_init(&server->tcp_ses_list);
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
|
|
cancel_delayed_work_sync(&server->echo);
|
|
|
|
spin_lock(&GlobalMid_Lock);
|
|
server->tcpStatus = CifsExiting;
|
|
spin_unlock(&GlobalMid_Lock);
|
|
|
|
cifs_crypto_shash_release(server);
|
|
cifs_fscache_release_client_cookie(server);
|
|
|
|
kfree(server->session_key.response);
|
|
server->session_key.response = NULL;
|
|
server->session_key.len = 0;
|
|
|
|
task = xchg(&server->tsk, NULL);
|
|
if (task)
|
|
force_sig(SIGKILL, task);
|
|
}
|
|
|
|
static struct TCP_Server_Info *
|
|
cifs_get_tcp_session(struct smb_vol *volume_info)
|
|
{
|
|
struct TCP_Server_Info *tcp_ses = NULL;
|
|
struct sockaddr_storage addr;
|
|
struct sockaddr_in *sin_server = (struct sockaddr_in *) &addr;
|
|
struct sockaddr_in6 *sin_server6 = (struct sockaddr_in6 *) &addr;
|
|
int rc;
|
|
|
|
memset(&addr, 0, sizeof(struct sockaddr_storage));
|
|
|
|
cFYI(1, "UNC: %s ip: %s", volume_info->UNC, volume_info->UNCip);
|
|
|
|
if (volume_info->UNCip && volume_info->UNC) {
|
|
rc = cifs_fill_sockaddr((struct sockaddr *)&addr,
|
|
volume_info->UNCip,
|
|
strlen(volume_info->UNCip),
|
|
volume_info->port);
|
|
if (!rc) {
|
|
/* we failed translating address */
|
|
rc = -EINVAL;
|
|
goto out_err;
|
|
}
|
|
} else if (volume_info->UNCip) {
|
|
/* BB using ip addr as tcp_ses name to connect to the
|
|
DFS root below */
|
|
cERROR(1, "Connecting to DFS root not implemented yet");
|
|
rc = -EINVAL;
|
|
goto out_err;
|
|
} else /* which tcp_sess DFS root would we conect to */ {
|
|
cERROR(1, "CIFS mount error: No UNC path (e.g. -o "
|
|
"unc=//192.168.1.100/public) specified");
|
|
rc = -EINVAL;
|
|
goto out_err;
|
|
}
|
|
|
|
/* see if we already have a matching tcp_ses */
|
|
tcp_ses = cifs_find_tcp_session((struct sockaddr *)&addr, volume_info);
|
|
if (tcp_ses)
|
|
return tcp_ses;
|
|
|
|
tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
|
|
if (!tcp_ses) {
|
|
rc = -ENOMEM;
|
|
goto out_err;
|
|
}
|
|
|
|
rc = cifs_crypto_shash_allocate(tcp_ses);
|
|
if (rc) {
|
|
cERROR(1, "could not setup hash structures rc %d", rc);
|
|
goto out_err;
|
|
}
|
|
|
|
tcp_ses->ops = volume_info->ops;
|
|
tcp_ses->vals = volume_info->vals;
|
|
cifs_set_net_ns(tcp_ses, get_net(current->nsproxy->net_ns));
|
|
tcp_ses->hostname = extract_hostname(volume_info->UNC);
|
|
if (IS_ERR(tcp_ses->hostname)) {
|
|
rc = PTR_ERR(tcp_ses->hostname);
|
|
goto out_err_crypto_release;
|
|
}
|
|
|
|
tcp_ses->noblocksnd = volume_info->noblocksnd;
|
|
tcp_ses->noautotune = volume_info->noautotune;
|
|
tcp_ses->tcp_nodelay = volume_info->sockopt_tcp_nodelay;
|
|
tcp_ses->in_flight = 0;
|
|
tcp_ses->credits = 1;
|
|
init_waitqueue_head(&tcp_ses->response_q);
|
|
init_waitqueue_head(&tcp_ses->request_q);
|
|
INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
|
|
mutex_init(&tcp_ses->srv_mutex);
|
|
memcpy(tcp_ses->workstation_RFC1001_name,
|
|
volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
|
|
memcpy(tcp_ses->server_RFC1001_name,
|
|
volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
|
|
tcp_ses->session_estab = false;
|
|
tcp_ses->sequence_number = 0;
|
|
tcp_ses->lstrp = jiffies;
|
|
spin_lock_init(&tcp_ses->req_lock);
|
|
INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
|
|
INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
|
|
INIT_DELAYED_WORK(&tcp_ses->echo, cifs_echo_request);
|
|
|
|
/*
|
|
* at this point we are the only ones with the pointer
|
|
* to the struct since the kernel thread not created yet
|
|
* no need to spinlock this init of tcpStatus or srv_count
|
|
*/
|
|
tcp_ses->tcpStatus = CifsNew;
|
|
memcpy(&tcp_ses->srcaddr, &volume_info->srcaddr,
|
|
sizeof(tcp_ses->srcaddr));
|
|
++tcp_ses->srv_count;
|
|
|
|
if (addr.ss_family == AF_INET6) {
|
|
cFYI(1, "attempting ipv6 connect");
|
|
/* BB should we allow ipv6 on port 139? */
|
|
/* other OS never observed in Wild doing 139 with v6 */
|
|
memcpy(&tcp_ses->dstaddr, sin_server6,
|
|
sizeof(struct sockaddr_in6));
|
|
} else
|
|
memcpy(&tcp_ses->dstaddr, sin_server,
|
|
sizeof(struct sockaddr_in));
|
|
|
|
rc = ip_connect(tcp_ses);
|
|
if (rc < 0) {
|
|
cERROR(1, "Error connecting to socket. Aborting operation");
|
|
goto out_err_crypto_release;
|
|
}
|
|
|
|
/*
|
|
* since we're in a cifs function already, we know that
|
|
* this will succeed. No need for try_module_get().
|
|
*/
|
|
__module_get(THIS_MODULE);
|
|
tcp_ses->tsk = kthread_run(cifs_demultiplex_thread,
|
|
tcp_ses, "cifsd");
|
|
if (IS_ERR(tcp_ses->tsk)) {
|
|
rc = PTR_ERR(tcp_ses->tsk);
|
|
cERROR(1, "error %d create cifsd thread", rc);
|
|
module_put(THIS_MODULE);
|
|
goto out_err_crypto_release;
|
|
}
|
|
tcp_ses->tcpStatus = CifsNeedNegotiate;
|
|
|
|
/* thread spawned, put it on the list */
|
|
spin_lock(&cifs_tcp_ses_lock);
|
|
list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
|
|
cifs_fscache_get_client_cookie(tcp_ses);
|
|
|
|
/* queue echo request delayed work */
|
|
queue_delayed_work(cifsiod_wq, &tcp_ses->echo, SMB_ECHO_INTERVAL);
|
|
|
|
return tcp_ses;
|
|
|
|
out_err_crypto_release:
|
|
cifs_crypto_shash_release(tcp_ses);
|
|
|
|
put_net(cifs_net_ns(tcp_ses));
|
|
|
|
out_err:
|
|
if (tcp_ses) {
|
|
if (!IS_ERR(tcp_ses->hostname))
|
|
kfree(tcp_ses->hostname);
|
|
if (tcp_ses->ssocket)
|
|
sock_release(tcp_ses->ssocket);
|
|
kfree(tcp_ses);
|
|
}
|
|
return ERR_PTR(rc);
|
|
}
|
|
|
|
static int match_session(struct cifs_ses *ses, struct smb_vol *vol)
|
|
{
|
|
switch (ses->server->secType) {
|
|
case Kerberos:
|
|
if (vol->cred_uid != ses->cred_uid)
|
|
return 0;
|
|
break;
|
|
default:
|
|
/* NULL username means anonymous session */
|
|
if (ses->user_name == NULL) {
|
|
if (!vol->nullauth)
|
|
return 0;
|
|
break;
|
|
}
|
|
|
|
/* anything else takes username/password */
|
|
if (strncmp(ses->user_name,
|
|
vol->username ? vol->username : "",
|
|
MAX_USERNAME_SIZE))
|
|
return 0;
|
|
if (strlen(vol->username) != 0 &&
|
|
ses->password != NULL &&
|
|
strncmp(ses->password,
|
|
vol->password ? vol->password : "",
|
|
MAX_PASSWORD_SIZE))
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static struct cifs_ses *
|
|
cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol)
|
|
{
|
|
struct cifs_ses *ses;
|
|
|
|
spin_lock(&cifs_tcp_ses_lock);
|
|
list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
|
|
if (!match_session(ses, vol))
|
|
continue;
|
|
++ses->ses_count;
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
return ses;
|
|
}
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
return NULL;
|
|
}
|
|
|
|
static void
|
|
cifs_put_smb_ses(struct cifs_ses *ses)
|
|
{
|
|
int xid;
|
|
struct TCP_Server_Info *server = ses->server;
|
|
|
|
cFYI(1, "%s: ses_count=%d\n", __func__, ses->ses_count);
|
|
spin_lock(&cifs_tcp_ses_lock);
|
|
if (--ses->ses_count > 0) {
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
return;
|
|
}
|
|
|
|
list_del_init(&ses->smb_ses_list);
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
|
|
if (ses->status == CifsGood) {
|
|
xid = GetXid();
|
|
CIFSSMBLogoff(xid, ses);
|
|
_FreeXid(xid);
|
|
}
|
|
sesInfoFree(ses);
|
|
cifs_put_tcp_session(server);
|
|
}
|
|
|
|
#ifdef CONFIG_KEYS
|
|
|
|
/* strlen("cifs:a:") + INET6_ADDRSTRLEN + 1 */
|
|
#define CIFSCREDS_DESC_SIZE (7 + INET6_ADDRSTRLEN + 1)
|
|
|
|
/* Populate username and pw fields from keyring if possible */
|
|
static int
|
|
cifs_set_cifscreds(struct smb_vol *vol, struct cifs_ses *ses)
|
|
{
|
|
int rc = 0;
|
|
char *desc, *delim, *payload;
|
|
ssize_t len;
|
|
struct key *key;
|
|
struct TCP_Server_Info *server = ses->server;
|
|
struct sockaddr_in *sa;
|
|
struct sockaddr_in6 *sa6;
|
|
struct user_key_payload *upayload;
|
|
|
|
desc = kmalloc(CIFSCREDS_DESC_SIZE, GFP_KERNEL);
|
|
if (!desc)
|
|
return -ENOMEM;
|
|
|
|
/* try to find an address key first */
|
|
switch (server->dstaddr.ss_family) {
|
|
case AF_INET:
|
|
sa = (struct sockaddr_in *)&server->dstaddr;
|
|
sprintf(desc, "cifs:a:%pI4", &sa->sin_addr.s_addr);
|
|
break;
|
|
case AF_INET6:
|
|
sa6 = (struct sockaddr_in6 *)&server->dstaddr;
|
|
sprintf(desc, "cifs:a:%pI6c", &sa6->sin6_addr.s6_addr);
|
|
break;
|
|
default:
|
|
cFYI(1, "Bad ss_family (%hu)", server->dstaddr.ss_family);
|
|
rc = -EINVAL;
|
|
goto out_err;
|
|
}
|
|
|
|
cFYI(1, "%s: desc=%s", __func__, desc);
|
|
key = request_key(&key_type_logon, desc, "");
|
|
if (IS_ERR(key)) {
|
|
if (!ses->domainName) {
|
|
cFYI(1, "domainName is NULL");
|
|
rc = PTR_ERR(key);
|
|
goto out_err;
|
|
}
|
|
|
|
/* didn't work, try to find a domain key */
|
|
sprintf(desc, "cifs:d:%s", ses->domainName);
|
|
cFYI(1, "%s: desc=%s", __func__, desc);
|
|
key = request_key(&key_type_logon, desc, "");
|
|
if (IS_ERR(key)) {
|
|
rc = PTR_ERR(key);
|
|
goto out_err;
|
|
}
|
|
}
|
|
|
|
down_read(&key->sem);
|
|
upayload = key->payload.data;
|
|
if (IS_ERR_OR_NULL(upayload)) {
|
|
rc = upayload ? PTR_ERR(upayload) : -EINVAL;
|
|
goto out_key_put;
|
|
}
|
|
|
|
/* find first : in payload */
|
|
payload = (char *)upayload->data;
|
|
delim = strnchr(payload, upayload->datalen, ':');
|
|
cFYI(1, "payload=%s", payload);
|
|
if (!delim) {
|
|
cFYI(1, "Unable to find ':' in payload (datalen=%d)",
|
|
upayload->datalen);
|
|
rc = -EINVAL;
|
|
goto out_key_put;
|
|
}
|
|
|
|
len = delim - payload;
|
|
if (len > MAX_USERNAME_SIZE || len <= 0) {
|
|
cFYI(1, "Bad value from username search (len=%zd)", len);
|
|
rc = -EINVAL;
|
|
goto out_key_put;
|
|
}
|
|
|
|
vol->username = kstrndup(payload, len, GFP_KERNEL);
|
|
if (!vol->username) {
|
|
cFYI(1, "Unable to allocate %zd bytes for username", len);
|
|
rc = -ENOMEM;
|
|
goto out_key_put;
|
|
}
|
|
cFYI(1, "%s: username=%s", __func__, vol->username);
|
|
|
|
len = key->datalen - (len + 1);
|
|
if (len > MAX_PASSWORD_SIZE || len <= 0) {
|
|
cFYI(1, "Bad len for password search (len=%zd)", len);
|
|
rc = -EINVAL;
|
|
kfree(vol->username);
|
|
vol->username = NULL;
|
|
goto out_key_put;
|
|
}
|
|
|
|
++delim;
|
|
vol->password = kstrndup(delim, len, GFP_KERNEL);
|
|
if (!vol->password) {
|
|
cFYI(1, "Unable to allocate %zd bytes for password", len);
|
|
rc = -ENOMEM;
|
|
kfree(vol->username);
|
|
vol->username = NULL;
|
|
goto out_key_put;
|
|
}
|
|
|
|
out_key_put:
|
|
up_read(&key->sem);
|
|
key_put(key);
|
|
out_err:
|
|
kfree(desc);
|
|
cFYI(1, "%s: returning %d", __func__, rc);
|
|
return rc;
|
|
}
|
|
#else /* ! CONFIG_KEYS */
|
|
static inline int
|
|
cifs_set_cifscreds(struct smb_vol *vol __attribute__((unused)),
|
|
struct cifs_ses *ses __attribute__((unused)))
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
#endif /* CONFIG_KEYS */
|
|
|
|
static bool warned_on_ntlm; /* globals init to false automatically */
|
|
|
|
static struct cifs_ses *
|
|
cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
|
|
{
|
|
int rc = -ENOMEM, xid;
|
|
struct cifs_ses *ses;
|
|
struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
|
|
struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
|
|
|
|
xid = GetXid();
|
|
|
|
ses = cifs_find_smb_ses(server, volume_info);
|
|
if (ses) {
|
|
cFYI(1, "Existing smb sess found (status=%d)", ses->status);
|
|
|
|
mutex_lock(&ses->session_mutex);
|
|
rc = cifs_negotiate_protocol(xid, ses);
|
|
if (rc) {
|
|
mutex_unlock(&ses->session_mutex);
|
|
/* problem -- put our ses reference */
|
|
cifs_put_smb_ses(ses);
|
|
FreeXid(xid);
|
|
return ERR_PTR(rc);
|
|
}
|
|
if (ses->need_reconnect) {
|
|
cFYI(1, "Session needs reconnect");
|
|
rc = cifs_setup_session(xid, ses,
|
|
volume_info->local_nls);
|
|
if (rc) {
|
|
mutex_unlock(&ses->session_mutex);
|
|
/* problem -- put our reference */
|
|
cifs_put_smb_ses(ses);
|
|
FreeXid(xid);
|
|
return ERR_PTR(rc);
|
|
}
|
|
}
|
|
mutex_unlock(&ses->session_mutex);
|
|
|
|
/* existing SMB ses has a server reference already */
|
|
cifs_put_tcp_session(server);
|
|
FreeXid(xid);
|
|
return ses;
|
|
}
|
|
|
|
cFYI(1, "Existing smb sess not found");
|
|
ses = sesInfoAlloc();
|
|
if (ses == NULL)
|
|
goto get_ses_fail;
|
|
|
|
/* new SMB session uses our server ref */
|
|
ses->server = server;
|
|
if (server->dstaddr.ss_family == AF_INET6)
|
|
sprintf(ses->serverName, "%pI6", &addr6->sin6_addr);
|
|
else
|
|
sprintf(ses->serverName, "%pI4", &addr->sin_addr);
|
|
|
|
if (volume_info->username) {
|
|
ses->user_name = kstrdup(volume_info->username, GFP_KERNEL);
|
|
if (!ses->user_name)
|
|
goto get_ses_fail;
|
|
}
|
|
|
|
/* volume_info->password freed at unmount */
|
|
if (volume_info->password) {
|
|
ses->password = kstrdup(volume_info->password, GFP_KERNEL);
|
|
if (!ses->password)
|
|
goto get_ses_fail;
|
|
}
|
|
if (volume_info->domainname) {
|
|
ses->domainName = kstrdup(volume_info->domainname, GFP_KERNEL);
|
|
if (!ses->domainName)
|
|
goto get_ses_fail;
|
|
}
|
|
ses->cred_uid = volume_info->cred_uid;
|
|
ses->linux_uid = volume_info->linux_uid;
|
|
|
|
/* ntlmv2 is much stronger than ntlm security, and has been broadly
|
|
supported for many years, time to update default security mechanism */
|
|
if ((volume_info->secFlg == 0) && warned_on_ntlm == false) {
|
|
warned_on_ntlm = true;
|
|
cERROR(1, "default security mechanism requested. The default "
|
|
"security mechanism will be upgraded from ntlm to "
|
|
"ntlmv2 in kernel release 3.3");
|
|
}
|
|
ses->overrideSecFlg = volume_info->secFlg;
|
|
|
|
mutex_lock(&ses->session_mutex);
|
|
rc = cifs_negotiate_protocol(xid, ses);
|
|
if (!rc)
|
|
rc = cifs_setup_session(xid, ses, volume_info->local_nls);
|
|
mutex_unlock(&ses->session_mutex);
|
|
if (rc)
|
|
goto get_ses_fail;
|
|
|
|
/* success, put it on the list */
|
|
spin_lock(&cifs_tcp_ses_lock);
|
|
list_add(&ses->smb_ses_list, &server->smb_ses_list);
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
|
|
FreeXid(xid);
|
|
return ses;
|
|
|
|
get_ses_fail:
|
|
sesInfoFree(ses);
|
|
FreeXid(xid);
|
|
return ERR_PTR(rc);
|
|
}
|
|
|
|
static int match_tcon(struct cifs_tcon *tcon, const char *unc)
|
|
{
|
|
if (tcon->tidStatus == CifsExiting)
|
|
return 0;
|
|
if (strncmp(tcon->treeName, unc, MAX_TREE_SIZE))
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
static struct cifs_tcon *
|
|
cifs_find_tcon(struct cifs_ses *ses, const char *unc)
|
|
{
|
|
struct list_head *tmp;
|
|
struct cifs_tcon *tcon;
|
|
|
|
spin_lock(&cifs_tcp_ses_lock);
|
|
list_for_each(tmp, &ses->tcon_list) {
|
|
tcon = list_entry(tmp, struct cifs_tcon, tcon_list);
|
|
if (!match_tcon(tcon, unc))
|
|
continue;
|
|
++tcon->tc_count;
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
return tcon;
|
|
}
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
return NULL;
|
|
}
|
|
|
|
static void
|
|
cifs_put_tcon(struct cifs_tcon *tcon)
|
|
{
|
|
int xid;
|
|
struct cifs_ses *ses = tcon->ses;
|
|
|
|
cFYI(1, "%s: tc_count=%d\n", __func__, tcon->tc_count);
|
|
spin_lock(&cifs_tcp_ses_lock);
|
|
if (--tcon->tc_count > 0) {
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
return;
|
|
}
|
|
|
|
list_del_init(&tcon->tcon_list);
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
|
|
xid = GetXid();
|
|
CIFSSMBTDis(xid, tcon);
|
|
_FreeXid(xid);
|
|
|
|
cifs_fscache_release_super_cookie(tcon);
|
|
tconInfoFree(tcon);
|
|
cifs_put_smb_ses(ses);
|
|
}
|
|
|
|
static struct cifs_tcon *
|
|
cifs_get_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
|
|
{
|
|
int rc, xid;
|
|
struct cifs_tcon *tcon;
|
|
|
|
tcon = cifs_find_tcon(ses, volume_info->UNC);
|
|
if (tcon) {
|
|
cFYI(1, "Found match on UNC path");
|
|
/* existing tcon already has a reference */
|
|
cifs_put_smb_ses(ses);
|
|
if (tcon->seal != volume_info->seal)
|
|
cERROR(1, "transport encryption setting "
|
|
"conflicts with existing tid");
|
|
return tcon;
|
|
}
|
|
|
|
tcon = tconInfoAlloc();
|
|
if (tcon == NULL) {
|
|
rc = -ENOMEM;
|
|
goto out_fail;
|
|
}
|
|
|
|
tcon->ses = ses;
|
|
if (volume_info->password) {
|
|
tcon->password = kstrdup(volume_info->password, GFP_KERNEL);
|
|
if (!tcon->password) {
|
|
rc = -ENOMEM;
|
|
goto out_fail;
|
|
}
|
|
}
|
|
|
|
if (strchr(volume_info->UNC + 3, '\\') == NULL
|
|
&& strchr(volume_info->UNC + 3, '/') == NULL) {
|
|
cERROR(1, "Missing share name");
|
|
rc = -ENODEV;
|
|
goto out_fail;
|
|
}
|
|
|
|
/* BB Do we need to wrap session_mutex around
|
|
* this TCon call and Unix SetFS as
|
|
* we do on SessSetup and reconnect? */
|
|
xid = GetXid();
|
|
rc = CIFSTCon(xid, ses, volume_info->UNC, tcon, volume_info->local_nls);
|
|
FreeXid(xid);
|
|
cFYI(1, "CIFS Tcon rc = %d", rc);
|
|
if (rc)
|
|
goto out_fail;
|
|
|
|
if (volume_info->nodfs) {
|
|
tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
|
|
cFYI(1, "DFS disabled (%d)", tcon->Flags);
|
|
}
|
|
tcon->seal = volume_info->seal;
|
|
/* we can have only one retry value for a connection
|
|
to a share so for resources mounted more than once
|
|
to the same server share the last value passed in
|
|
for the retry flag is used */
|
|
tcon->retry = volume_info->retry;
|
|
tcon->nocase = volume_info->nocase;
|
|
tcon->local_lease = volume_info->local_lease;
|
|
|
|
spin_lock(&cifs_tcp_ses_lock);
|
|
list_add(&tcon->tcon_list, &ses->tcon_list);
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
|
|
cifs_fscache_get_super_cookie(tcon);
|
|
|
|
return tcon;
|
|
|
|
out_fail:
|
|
tconInfoFree(tcon);
|
|
return ERR_PTR(rc);
|
|
}
|
|
|
|
void
|
|
cifs_put_tlink(struct tcon_link *tlink)
|
|
{
|
|
if (!tlink || IS_ERR(tlink))
|
|
return;
|
|
|
|
if (!atomic_dec_and_test(&tlink->tl_count) ||
|
|
test_bit(TCON_LINK_IN_TREE, &tlink->tl_flags)) {
|
|
tlink->tl_time = jiffies;
|
|
return;
|
|
}
|
|
|
|
if (!IS_ERR(tlink_tcon(tlink)))
|
|
cifs_put_tcon(tlink_tcon(tlink));
|
|
kfree(tlink);
|
|
return;
|
|
}
|
|
|
|
static inline struct tcon_link *
|
|
cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb)
|
|
{
|
|
return cifs_sb->master_tlink;
|
|
}
|
|
|
|
static int
|
|
compare_mount_options(struct super_block *sb, struct cifs_mnt_data *mnt_data)
|
|
{
|
|
struct cifs_sb_info *old = CIFS_SB(sb);
|
|
struct cifs_sb_info *new = mnt_data->cifs_sb;
|
|
|
|
if ((sb->s_flags & CIFS_MS_MASK) != (mnt_data->flags & CIFS_MS_MASK))
|
|
return 0;
|
|
|
|
if ((old->mnt_cifs_flags & CIFS_MOUNT_MASK) !=
|
|
(new->mnt_cifs_flags & CIFS_MOUNT_MASK))
|
|
return 0;
|
|
|
|
/*
|
|
* We want to share sb only if we don't specify an r/wsize or
|
|
* specified r/wsize is greater than or equal to existing one.
|
|
*/
|
|
if (new->wsize && new->wsize < old->wsize)
|
|
return 0;
|
|
|
|
if (new->rsize && new->rsize < old->rsize)
|
|
return 0;
|
|
|
|
if (old->mnt_uid != new->mnt_uid || old->mnt_gid != new->mnt_gid)
|
|
return 0;
|
|
|
|
if (old->mnt_file_mode != new->mnt_file_mode ||
|
|
old->mnt_dir_mode != new->mnt_dir_mode)
|
|
return 0;
|
|
|
|
if (strcmp(old->local_nls->charset, new->local_nls->charset))
|
|
return 0;
|
|
|
|
if (old->actimeo != new->actimeo)
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
int
|
|
cifs_match_super(struct super_block *sb, void *data)
|
|
{
|
|
struct cifs_mnt_data *mnt_data = (struct cifs_mnt_data *)data;
|
|
struct smb_vol *volume_info;
|
|
struct cifs_sb_info *cifs_sb;
|
|
struct TCP_Server_Info *tcp_srv;
|
|
struct cifs_ses *ses;
|
|
struct cifs_tcon *tcon;
|
|
struct tcon_link *tlink;
|
|
struct sockaddr_storage addr;
|
|
int rc = 0;
|
|
|
|
memset(&addr, 0, sizeof(struct sockaddr_storage));
|
|
|
|
spin_lock(&cifs_tcp_ses_lock);
|
|
cifs_sb = CIFS_SB(sb);
|
|
tlink = cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
|
|
if (IS_ERR(tlink)) {
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
return rc;
|
|
}
|
|
tcon = tlink_tcon(tlink);
|
|
ses = tcon->ses;
|
|
tcp_srv = ses->server;
|
|
|
|
volume_info = mnt_data->vol;
|
|
|
|
if (!volume_info->UNCip || !volume_info->UNC)
|
|
goto out;
|
|
|
|
rc = cifs_fill_sockaddr((struct sockaddr *)&addr,
|
|
volume_info->UNCip,
|
|
strlen(volume_info->UNCip),
|
|
volume_info->port);
|
|
if (!rc)
|
|
goto out;
|
|
|
|
if (!match_server(tcp_srv, (struct sockaddr *)&addr, volume_info) ||
|
|
!match_session(ses, volume_info) ||
|
|
!match_tcon(tcon, volume_info->UNC)) {
|
|
rc = 0;
|
|
goto out;
|
|
}
|
|
|
|
rc = compare_mount_options(sb, mnt_data);
|
|
out:
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
cifs_put_tlink(tlink);
|
|
return rc;
|
|
}
|
|
|
|
int
|
|
get_dfs_path(int xid, struct cifs_ses *pSesInfo, const char *old_path,
|
|
const struct nls_table *nls_codepage, unsigned int *pnum_referrals,
|
|
struct dfs_info3_param **preferrals, int remap)
|
|
{
|
|
char *temp_unc;
|
|
int rc = 0;
|
|
|
|
*pnum_referrals = 0;
|
|
*preferrals = NULL;
|
|
|
|
if (pSesInfo->ipc_tid == 0) {
|
|
temp_unc = kmalloc(2 /* for slashes */ +
|
|
strnlen(pSesInfo->serverName,
|
|
SERVER_NAME_LEN_WITH_NULL * 2)
|
|
+ 1 + 4 /* slash IPC$ */ + 2,
|
|
GFP_KERNEL);
|
|
if (temp_unc == NULL)
|
|
return -ENOMEM;
|
|
temp_unc[0] = '\\';
|
|
temp_unc[1] = '\\';
|
|
strcpy(temp_unc + 2, pSesInfo->serverName);
|
|
strcpy(temp_unc + 2 + strlen(pSesInfo->serverName), "\\IPC$");
|
|
rc = CIFSTCon(xid, pSesInfo, temp_unc, NULL, nls_codepage);
|
|
cFYI(1, "CIFS Tcon rc = %d ipc_tid = %d", rc, pSesInfo->ipc_tid);
|
|
kfree(temp_unc);
|
|
}
|
|
if (rc == 0)
|
|
rc = CIFSGetDFSRefer(xid, pSesInfo, old_path, preferrals,
|
|
pnum_referrals, nls_codepage, remap);
|
|
/* BB map targetUNCs to dfs_info3 structures, here or
|
|
in CIFSGetDFSRefer BB */
|
|
|
|
return rc;
|
|
}
|
|
|
|
#ifdef CONFIG_DEBUG_LOCK_ALLOC
|
|
static struct lock_class_key cifs_key[2];
|
|
static struct lock_class_key cifs_slock_key[2];
|
|
|
|
static inline void
|
|
cifs_reclassify_socket4(struct socket *sock)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
BUG_ON(sock_owned_by_user(sk));
|
|
sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
|
|
&cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
|
|
}
|
|
|
|
static inline void
|
|
cifs_reclassify_socket6(struct socket *sock)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
BUG_ON(sock_owned_by_user(sk));
|
|
sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
|
|
&cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
|
|
}
|
|
#else
|
|
static inline void
|
|
cifs_reclassify_socket4(struct socket *sock)
|
|
{
|
|
}
|
|
|
|
static inline void
|
|
cifs_reclassify_socket6(struct socket *sock)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
/* See RFC1001 section 14 on representation of Netbios names */
|
|
static void rfc1002mangle(char *target, char *source, unsigned int length)
|
|
{
|
|
unsigned int i, j;
|
|
|
|
for (i = 0, j = 0; i < (length); i++) {
|
|
/* mask a nibble at a time and encode */
|
|
target[j] = 'A' + (0x0F & (source[i] >> 4));
|
|
target[j+1] = 'A' + (0x0F & source[i]);
|
|
j += 2;
|
|
}
|
|
|
|
}
|
|
|
|
static int
|
|
bind_socket(struct TCP_Server_Info *server)
|
|
{
|
|
int rc = 0;
|
|
if (server->srcaddr.ss_family != AF_UNSPEC) {
|
|
/* Bind to the specified local IP address */
|
|
struct socket *socket = server->ssocket;
|
|
rc = socket->ops->bind(socket,
|
|
(struct sockaddr *) &server->srcaddr,
|
|
sizeof(server->srcaddr));
|
|
if (rc < 0) {
|
|
struct sockaddr_in *saddr4;
|
|
struct sockaddr_in6 *saddr6;
|
|
saddr4 = (struct sockaddr_in *)&server->srcaddr;
|
|
saddr6 = (struct sockaddr_in6 *)&server->srcaddr;
|
|
if (saddr6->sin6_family == AF_INET6)
|
|
cERROR(1, "cifs: "
|
|
"Failed to bind to: %pI6c, error: %d\n",
|
|
&saddr6->sin6_addr, rc);
|
|
else
|
|
cERROR(1, "cifs: "
|
|
"Failed to bind to: %pI4, error: %d\n",
|
|
&saddr4->sin_addr.s_addr, rc);
|
|
}
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
static int
|
|
ip_rfc1001_connect(struct TCP_Server_Info *server)
|
|
{
|
|
int rc = 0;
|
|
/*
|
|
* some servers require RFC1001 sessinit before sending
|
|
* negprot - BB check reconnection in case where second
|
|
* sessinit is sent but no second negprot
|
|
*/
|
|
struct rfc1002_session_packet *ses_init_buf;
|
|
struct smb_hdr *smb_buf;
|
|
ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
|
|
GFP_KERNEL);
|
|
if (ses_init_buf) {
|
|
ses_init_buf->trailer.session_req.called_len = 32;
|
|
|
|
if (server->server_RFC1001_name &&
|
|
server->server_RFC1001_name[0] != 0)
|
|
rfc1002mangle(ses_init_buf->trailer.
|
|
session_req.called_name,
|
|
server->server_RFC1001_name,
|
|
RFC1001_NAME_LEN_WITH_NULL);
|
|
else
|
|
rfc1002mangle(ses_init_buf->trailer.
|
|
session_req.called_name,
|
|
DEFAULT_CIFS_CALLED_NAME,
|
|
RFC1001_NAME_LEN_WITH_NULL);
|
|
|
|
ses_init_buf->trailer.session_req.calling_len = 32;
|
|
|
|
/*
|
|
* calling name ends in null (byte 16) from old smb
|
|
* convention.
|
|
*/
|
|
if (server->workstation_RFC1001_name &&
|
|
server->workstation_RFC1001_name[0] != 0)
|
|
rfc1002mangle(ses_init_buf->trailer.
|
|
session_req.calling_name,
|
|
server->workstation_RFC1001_name,
|
|
RFC1001_NAME_LEN_WITH_NULL);
|
|
else
|
|
rfc1002mangle(ses_init_buf->trailer.
|
|
session_req.calling_name,
|
|
"LINUX_CIFS_CLNT",
|
|
RFC1001_NAME_LEN_WITH_NULL);
|
|
|
|
ses_init_buf->trailer.session_req.scope1 = 0;
|
|
ses_init_buf->trailer.session_req.scope2 = 0;
|
|
smb_buf = (struct smb_hdr *)ses_init_buf;
|
|
|
|
/* sizeof RFC1002_SESSION_REQUEST with no scope */
|
|
smb_buf->smb_buf_length = cpu_to_be32(0x81000044);
|
|
rc = smb_send(server, smb_buf, 0x44);
|
|
kfree(ses_init_buf);
|
|
/*
|
|
* RFC1001 layer in at least one server
|
|
* requires very short break before negprot
|
|
* presumably because not expecting negprot
|
|
* to follow so fast. This is a simple
|
|
* solution that works without
|
|
* complicating the code and causes no
|
|
* significant slowing down on mount
|
|
* for everyone else
|
|
*/
|
|
usleep_range(1000, 2000);
|
|
}
|
|
/*
|
|
* else the negprot may still work without this
|
|
* even though malloc failed
|
|
*/
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int
|
|
generic_ip_connect(struct TCP_Server_Info *server)
|
|
{
|
|
int rc = 0;
|
|
__be16 sport;
|
|
int slen, sfamily;
|
|
struct socket *socket = server->ssocket;
|
|
struct sockaddr *saddr;
|
|
|
|
saddr = (struct sockaddr *) &server->dstaddr;
|
|
|
|
if (server->dstaddr.ss_family == AF_INET6) {
|
|
sport = ((struct sockaddr_in6 *) saddr)->sin6_port;
|
|
slen = sizeof(struct sockaddr_in6);
|
|
sfamily = AF_INET6;
|
|
} else {
|
|
sport = ((struct sockaddr_in *) saddr)->sin_port;
|
|
slen = sizeof(struct sockaddr_in);
|
|
sfamily = AF_INET;
|
|
}
|
|
|
|
if (socket == NULL) {
|
|
rc = __sock_create(cifs_net_ns(server), sfamily, SOCK_STREAM,
|
|
IPPROTO_TCP, &socket, 1);
|
|
if (rc < 0) {
|
|
cERROR(1, "Error %d creating socket", rc);
|
|
server->ssocket = NULL;
|
|
return rc;
|
|
}
|
|
|
|
/* BB other socket options to set KEEPALIVE, NODELAY? */
|
|
cFYI(1, "Socket created");
|
|
server->ssocket = socket;
|
|
socket->sk->sk_allocation = GFP_NOFS;
|
|
if (sfamily == AF_INET6)
|
|
cifs_reclassify_socket6(socket);
|
|
else
|
|
cifs_reclassify_socket4(socket);
|
|
}
|
|
|
|
rc = bind_socket(server);
|
|
if (rc < 0)
|
|
return rc;
|
|
|
|
/*
|
|
* Eventually check for other socket options to change from
|
|
* the default. sock_setsockopt not used because it expects
|
|
* user space buffer
|
|
*/
|
|
socket->sk->sk_rcvtimeo = 7 * HZ;
|
|
socket->sk->sk_sndtimeo = 5 * HZ;
|
|
|
|
/* make the bufsizes depend on wsize/rsize and max requests */
|
|
if (server->noautotune) {
|
|
if (socket->sk->sk_sndbuf < (200 * 1024))
|
|
socket->sk->sk_sndbuf = 200 * 1024;
|
|
if (socket->sk->sk_rcvbuf < (140 * 1024))
|
|
socket->sk->sk_rcvbuf = 140 * 1024;
|
|
}
|
|
|
|
if (server->tcp_nodelay) {
|
|
int val = 1;
|
|
rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
|
|
(char *)&val, sizeof(val));
|
|
if (rc)
|
|
cFYI(1, "set TCP_NODELAY socket option error %d", rc);
|
|
}
|
|
|
|
cFYI(1, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx",
|
|
socket->sk->sk_sndbuf,
|
|
socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
|
|
|
|
rc = socket->ops->connect(socket, saddr, slen, 0);
|
|
if (rc < 0) {
|
|
cFYI(1, "Error %d connecting to server", rc);
|
|
sock_release(socket);
|
|
server->ssocket = NULL;
|
|
return rc;
|
|
}
|
|
|
|
if (sport == htons(RFC1001_PORT))
|
|
rc = ip_rfc1001_connect(server);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int
|
|
ip_connect(struct TCP_Server_Info *server)
|
|
{
|
|
__be16 *sport;
|
|
struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
|
|
struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
|
|
|
|
if (server->dstaddr.ss_family == AF_INET6)
|
|
sport = &addr6->sin6_port;
|
|
else
|
|
sport = &addr->sin_port;
|
|
|
|
if (*sport == 0) {
|
|
int rc;
|
|
|
|
/* try with 445 port at first */
|
|
*sport = htons(CIFS_PORT);
|
|
|
|
rc = generic_ip_connect(server);
|
|
if (rc >= 0)
|
|
return rc;
|
|
|
|
/* if it failed, try with 139 port */
|
|
*sport = htons(RFC1001_PORT);
|
|
}
|
|
|
|
return generic_ip_connect(server);
|
|
}
|
|
|
|
void reset_cifs_unix_caps(int xid, struct cifs_tcon *tcon,
|
|
struct cifs_sb_info *cifs_sb, struct smb_vol *vol_info)
|
|
{
|
|
/* if we are reconnecting then should we check to see if
|
|
* any requested capabilities changed locally e.g. via
|
|
* remount but we can not do much about it here
|
|
* if they have (even if we could detect it by the following)
|
|
* Perhaps we could add a backpointer to array of sb from tcon
|
|
* or if we change to make all sb to same share the same
|
|
* sb as NFS - then we only have one backpointer to sb.
|
|
* What if we wanted to mount the server share twice once with
|
|
* and once without posixacls or posix paths? */
|
|
__u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
|
|
|
|
if (vol_info && vol_info->no_linux_ext) {
|
|
tcon->fsUnixInfo.Capability = 0;
|
|
tcon->unix_ext = 0; /* Unix Extensions disabled */
|
|
cFYI(1, "Linux protocol extensions disabled");
|
|
return;
|
|
} else if (vol_info)
|
|
tcon->unix_ext = 1; /* Unix Extensions supported */
|
|
|
|
if (tcon->unix_ext == 0) {
|
|
cFYI(1, "Unix extensions disabled so not set on reconnect");
|
|
return;
|
|
}
|
|
|
|
if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
|
|
__u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
|
|
cFYI(1, "unix caps which server supports %lld", cap);
|
|
/* check for reconnect case in which we do not
|
|
want to change the mount behavior if we can avoid it */
|
|
if (vol_info == NULL) {
|
|
/* turn off POSIX ACL and PATHNAMES if not set
|
|
originally at mount time */
|
|
if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
|
|
cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
|
|
if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
|
|
if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
|
|
cERROR(1, "POSIXPATH support change");
|
|
cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
|
|
} else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
|
|
cERROR(1, "possible reconnect error");
|
|
cERROR(1, "server disabled POSIX path support");
|
|
}
|
|
}
|
|
|
|
if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
|
|
cERROR(1, "per-share encryption not supported yet");
|
|
|
|
cap &= CIFS_UNIX_CAP_MASK;
|
|
if (vol_info && vol_info->no_psx_acl)
|
|
cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
|
|
else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
|
|
cFYI(1, "negotiated posix acl support");
|
|
if (cifs_sb)
|
|
cifs_sb->mnt_cifs_flags |=
|
|
CIFS_MOUNT_POSIXACL;
|
|
}
|
|
|
|
if (vol_info && vol_info->posix_paths == 0)
|
|
cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
|
|
else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
|
|
cFYI(1, "negotiate posix pathnames");
|
|
if (cifs_sb)
|
|
cifs_sb->mnt_cifs_flags |=
|
|
CIFS_MOUNT_POSIX_PATHS;
|
|
}
|
|
|
|
cFYI(1, "Negotiate caps 0x%x", (int)cap);
|
|
#ifdef CONFIG_CIFS_DEBUG2
|
|
if (cap & CIFS_UNIX_FCNTL_CAP)
|
|
cFYI(1, "FCNTL cap");
|
|
if (cap & CIFS_UNIX_EXTATTR_CAP)
|
|
cFYI(1, "EXTATTR cap");
|
|
if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
|
|
cFYI(1, "POSIX path cap");
|
|
if (cap & CIFS_UNIX_XATTR_CAP)
|
|
cFYI(1, "XATTR cap");
|
|
if (cap & CIFS_UNIX_POSIX_ACL_CAP)
|
|
cFYI(1, "POSIX ACL cap");
|
|
if (cap & CIFS_UNIX_LARGE_READ_CAP)
|
|
cFYI(1, "very large read cap");
|
|
if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
|
|
cFYI(1, "very large write cap");
|
|
if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_CAP)
|
|
cFYI(1, "transport encryption cap");
|
|
if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
|
|
cFYI(1, "mandatory transport encryption cap");
|
|
#endif /* CIFS_DEBUG2 */
|
|
if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
|
|
if (vol_info == NULL) {
|
|
cFYI(1, "resetting capabilities failed");
|
|
} else
|
|
cERROR(1, "Negotiating Unix capabilities "
|
|
"with the server failed. Consider "
|
|
"mounting with the Unix Extensions\n"
|
|
"disabled, if problems are found, "
|
|
"by specifying the nounix mount "
|
|
"option.");
|
|
|
|
}
|
|
}
|
|
}
|
|
|
|
void cifs_setup_cifs_sb(struct smb_vol *pvolume_info,
|
|
struct cifs_sb_info *cifs_sb)
|
|
{
|
|
INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks);
|
|
|
|
spin_lock_init(&cifs_sb->tlink_tree_lock);
|
|
cifs_sb->tlink_tree = RB_ROOT;
|
|
|
|
/*
|
|
* Temporarily set r/wsize for matching superblock. If we end up using
|
|
* new sb then client will later negotiate it downward if needed.
|
|
*/
|
|
cifs_sb->rsize = pvolume_info->rsize;
|
|
cifs_sb->wsize = pvolume_info->wsize;
|
|
|
|
cifs_sb->mnt_uid = pvolume_info->linux_uid;
|
|
cifs_sb->mnt_gid = pvolume_info->linux_gid;
|
|
cifs_sb->mnt_file_mode = pvolume_info->file_mode;
|
|
cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
|
|
cFYI(1, "file mode: 0x%hx dir mode: 0x%hx",
|
|
cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode);
|
|
|
|
cifs_sb->actimeo = pvolume_info->actimeo;
|
|
cifs_sb->local_nls = pvolume_info->local_nls;
|
|
|
|
if (pvolume_info->noperm)
|
|
cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
|
|
if (pvolume_info->setuids)
|
|
cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
|
|
if (pvolume_info->server_ino)
|
|
cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
|
|
if (pvolume_info->remap)
|
|
cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
|
|
if (pvolume_info->no_xattr)
|
|
cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
|
|
if (pvolume_info->sfu_emul)
|
|
cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
|
|
if (pvolume_info->nobrl)
|
|
cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
|
|
if (pvolume_info->nostrictsync)
|
|
cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
|
|
if (pvolume_info->mand_lock)
|
|
cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
|
|
if (pvolume_info->rwpidforward)
|
|
cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RWPIDFORWARD;
|
|
if (pvolume_info->cifs_acl)
|
|
cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
|
|
if (pvolume_info->backupuid_specified) {
|
|
cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPUID;
|
|
cifs_sb->mnt_backupuid = pvolume_info->backupuid;
|
|
}
|
|
if (pvolume_info->backupgid_specified) {
|
|
cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPGID;
|
|
cifs_sb->mnt_backupgid = pvolume_info->backupgid;
|
|
}
|
|
if (pvolume_info->override_uid)
|
|
cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
|
|
if (pvolume_info->override_gid)
|
|
cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
|
|
if (pvolume_info->dynperm)
|
|
cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
|
|
if (pvolume_info->fsc)
|
|
cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_FSCACHE;
|
|
if (pvolume_info->multiuser)
|
|
cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_MULTIUSER |
|
|
CIFS_MOUNT_NO_PERM);
|
|
if (pvolume_info->strict_io)
|
|
cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_STRICT_IO;
|
|
if (pvolume_info->direct_io) {
|
|
cFYI(1, "mounting share using direct i/o");
|
|
cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
|
|
}
|
|
if (pvolume_info->mfsymlinks) {
|
|
if (pvolume_info->sfu_emul) {
|
|
cERROR(1, "mount option mfsymlinks ignored if sfu "
|
|
"mount option is used");
|
|
} else {
|
|
cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MF_SYMLINKS;
|
|
}
|
|
}
|
|
|
|
if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
|
|
cERROR(1, "mount option dynperm ignored if cifsacl "
|
|
"mount option supported");
|
|
}
|
|
|
|
/*
|
|
* When the server supports very large reads and writes via POSIX extensions,
|
|
* we can allow up to 2^24-1, minus the size of a READ/WRITE_AND_X header, not
|
|
* including the RFC1001 length.
|
|
*
|
|
* Note that this might make for "interesting" allocation problems during
|
|
* writeback however as we have to allocate an array of pointers for the
|
|
* pages. A 16M write means ~32kb page array with PAGE_CACHE_SIZE == 4096.
|
|
*
|
|
* For reads, there is a similar problem as we need to allocate an array
|
|
* of kvecs to handle the receive, though that should only need to be done
|
|
* once.
|
|
*/
|
|
#define CIFS_MAX_WSIZE ((1<<24) - 1 - sizeof(WRITE_REQ) + 4)
|
|
#define CIFS_MAX_RSIZE ((1<<24) - sizeof(READ_RSP) + 4)
|
|
|
|
/*
|
|
* When the server doesn't allow large posix writes, only allow a rsize/wsize
|
|
* of 2^17-1 minus the size of the call header. That allows for a read or
|
|
* write up to the maximum size described by RFC1002.
|
|
*/
|
|
#define CIFS_MAX_RFC1002_WSIZE ((1<<17) - 1 - sizeof(WRITE_REQ) + 4)
|
|
#define CIFS_MAX_RFC1002_RSIZE ((1<<17) - 1 - sizeof(READ_RSP) + 4)
|
|
|
|
/*
|
|
* The default wsize is 1M. find_get_pages seems to return a maximum of 256
|
|
* pages in a single call. With PAGE_CACHE_SIZE == 4k, this means we can fill
|
|
* a single wsize request with a single call.
|
|
*/
|
|
#define CIFS_DEFAULT_IOSIZE (1024 * 1024)
|
|
|
|
/*
|
|
* Windows only supports a max of 60kb reads and 65535 byte writes. Default to
|
|
* those values when posix extensions aren't in force. In actuality here, we
|
|
* use 65536 to allow for a write that is a multiple of 4k. Most servers seem
|
|
* to be ok with the extra byte even though Windows doesn't send writes that
|
|
* are that large.
|
|
*
|
|
* Citation:
|
|
*
|
|
* http://blogs.msdn.com/b/openspecification/archive/2009/04/10/smb-maximum-transmit-buffer-size-and-performance-tuning.aspx
|
|
*/
|
|
#define CIFS_DEFAULT_NON_POSIX_RSIZE (60 * 1024)
|
|
#define CIFS_DEFAULT_NON_POSIX_WSIZE (65536)
|
|
|
|
static unsigned int
|
|
cifs_negotiate_wsize(struct cifs_tcon *tcon, struct smb_vol *pvolume_info)
|
|
{
|
|
__u64 unix_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
|
|
struct TCP_Server_Info *server = tcon->ses->server;
|
|
unsigned int wsize;
|
|
|
|
/* start with specified wsize, or default */
|
|
if (pvolume_info->wsize)
|
|
wsize = pvolume_info->wsize;
|
|
else if (tcon->unix_ext && (unix_cap & CIFS_UNIX_LARGE_WRITE_CAP))
|
|
wsize = CIFS_DEFAULT_IOSIZE;
|
|
else
|
|
wsize = CIFS_DEFAULT_NON_POSIX_WSIZE;
|
|
|
|
/* can server support 24-bit write sizes? (via UNIX extensions) */
|
|
if (!tcon->unix_ext || !(unix_cap & CIFS_UNIX_LARGE_WRITE_CAP))
|
|
wsize = min_t(unsigned int, wsize, CIFS_MAX_RFC1002_WSIZE);
|
|
|
|
/*
|
|
* no CAP_LARGE_WRITE_X or is signing enabled without CAP_UNIX set?
|
|
* Limit it to max buffer offered by the server, minus the size of the
|
|
* WRITEX header, not including the 4 byte RFC1001 length.
|
|
*/
|
|
if (!(server->capabilities & CAP_LARGE_WRITE_X) ||
|
|
(!(server->capabilities & CAP_UNIX) &&
|
|
(server->sec_mode & (SECMODE_SIGN_ENABLED|SECMODE_SIGN_REQUIRED))))
|
|
wsize = min_t(unsigned int, wsize,
|
|
server->maxBuf - sizeof(WRITE_REQ) + 4);
|
|
|
|
/* hard limit of CIFS_MAX_WSIZE */
|
|
wsize = min_t(unsigned int, wsize, CIFS_MAX_WSIZE);
|
|
|
|
return wsize;
|
|
}
|
|
|
|
static unsigned int
|
|
cifs_negotiate_rsize(struct cifs_tcon *tcon, struct smb_vol *pvolume_info)
|
|
{
|
|
__u64 unix_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
|
|
struct TCP_Server_Info *server = tcon->ses->server;
|
|
unsigned int rsize, defsize;
|
|
|
|
/*
|
|
* Set default value...
|
|
*
|
|
* HACK alert! Ancient servers have very small buffers. Even though
|
|
* MS-CIFS indicates that servers are only limited by the client's
|
|
* bufsize for reads, testing against win98se shows that it throws
|
|
* INVALID_PARAMETER errors if you try to request too large a read.
|
|
*
|
|
* If the server advertises a MaxBufferSize of less than one page,
|
|
* assume that it also can't satisfy reads larger than that either.
|
|
*
|
|
* FIXME: Is there a better heuristic for this?
|
|
*/
|
|
if (tcon->unix_ext && (unix_cap & CIFS_UNIX_LARGE_READ_CAP))
|
|
defsize = CIFS_DEFAULT_IOSIZE;
|
|
else if (server->capabilities & CAP_LARGE_READ_X)
|
|
defsize = CIFS_DEFAULT_NON_POSIX_RSIZE;
|
|
else if (server->maxBuf >= PAGE_CACHE_SIZE)
|
|
defsize = CIFSMaxBufSize;
|
|
else
|
|
defsize = server->maxBuf - sizeof(READ_RSP);
|
|
|
|
rsize = pvolume_info->rsize ? pvolume_info->rsize : defsize;
|
|
|
|
/*
|
|
* no CAP_LARGE_READ_X? Then MS-CIFS states that we must limit this to
|
|
* the client's MaxBufferSize.
|
|
*/
|
|
if (!(server->capabilities & CAP_LARGE_READ_X))
|
|
rsize = min_t(unsigned int, CIFSMaxBufSize, rsize);
|
|
|
|
/* hard limit of CIFS_MAX_RSIZE */
|
|
rsize = min_t(unsigned int, rsize, CIFS_MAX_RSIZE);
|
|
|
|
return rsize;
|
|
}
|
|
|
|
static int
|
|
is_path_accessible(int xid, struct cifs_tcon *tcon,
|
|
struct cifs_sb_info *cifs_sb, const char *full_path)
|
|
{
|
|
int rc;
|
|
FILE_ALL_INFO *pfile_info;
|
|
|
|
pfile_info = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
|
|
if (pfile_info == NULL)
|
|
return -ENOMEM;
|
|
|
|
rc = CIFSSMBQPathInfo(xid, tcon, full_path, pfile_info,
|
|
0 /* not legacy */, cifs_sb->local_nls,
|
|
cifs_sb->mnt_cifs_flags &
|
|
CIFS_MOUNT_MAP_SPECIAL_CHR);
|
|
|
|
if (rc == -EOPNOTSUPP || rc == -EINVAL)
|
|
rc = SMBQueryInformation(xid, tcon, full_path, pfile_info,
|
|
cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
|
|
CIFS_MOUNT_MAP_SPECIAL_CHR);
|
|
kfree(pfile_info);
|
|
return rc;
|
|
}
|
|
|
|
static void
|
|
cleanup_volume_info_contents(struct smb_vol *volume_info)
|
|
{
|
|
kfree(volume_info->username);
|
|
kzfree(volume_info->password);
|
|
if (volume_info->UNCip != volume_info->UNC + 2)
|
|
kfree(volume_info->UNCip);
|
|
kfree(volume_info->UNC);
|
|
kfree(volume_info->domainname);
|
|
kfree(volume_info->iocharset);
|
|
kfree(volume_info->prepath);
|
|
}
|
|
|
|
void
|
|
cifs_cleanup_volume_info(struct smb_vol *volume_info)
|
|
{
|
|
if (!volume_info)
|
|
return;
|
|
cleanup_volume_info_contents(volume_info);
|
|
kfree(volume_info);
|
|
}
|
|
|
|
|
|
#ifdef CONFIG_CIFS_DFS_UPCALL
|
|
/* build_path_to_root returns full path to root when
|
|
* we do not have an exiting connection (tcon) */
|
|
static char *
|
|
build_unc_path_to_root(const struct smb_vol *vol,
|
|
const struct cifs_sb_info *cifs_sb)
|
|
{
|
|
char *full_path, *pos;
|
|
unsigned int pplen = vol->prepath ? strlen(vol->prepath) : 0;
|
|
unsigned int unc_len = strnlen(vol->UNC, MAX_TREE_SIZE + 1);
|
|
|
|
full_path = kmalloc(unc_len + pplen + 1, GFP_KERNEL);
|
|
if (full_path == NULL)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
strncpy(full_path, vol->UNC, unc_len);
|
|
pos = full_path + unc_len;
|
|
|
|
if (pplen) {
|
|
strncpy(pos, vol->prepath, pplen);
|
|
pos += pplen;
|
|
}
|
|
|
|
*pos = '\0'; /* add trailing null */
|
|
convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
|
|
cFYI(1, "%s: full_path=%s", __func__, full_path);
|
|
return full_path;
|
|
}
|
|
|
|
/*
|
|
* Perform a dfs referral query for a share and (optionally) prefix
|
|
*
|
|
* If a referral is found, cifs_sb->mountdata will be (re-)allocated
|
|
* to a string containing updated options for the submount. Otherwise it
|
|
* will be left untouched.
|
|
*
|
|
* Returns the rc from get_dfs_path to the caller, which can be used to
|
|
* determine whether there were referrals.
|
|
*/
|
|
static int
|
|
expand_dfs_referral(int xid, struct cifs_ses *pSesInfo,
|
|
struct smb_vol *volume_info, struct cifs_sb_info *cifs_sb,
|
|
int check_prefix)
|
|
{
|
|
int rc;
|
|
unsigned int num_referrals = 0;
|
|
struct dfs_info3_param *referrals = NULL;
|
|
char *full_path = NULL, *ref_path = NULL, *mdata = NULL;
|
|
|
|
full_path = build_unc_path_to_root(volume_info, cifs_sb);
|
|
if (IS_ERR(full_path))
|
|
return PTR_ERR(full_path);
|
|
|
|
/* For DFS paths, skip the first '\' of the UNC */
|
|
ref_path = check_prefix ? full_path + 1 : volume_info->UNC + 1;
|
|
|
|
rc = get_dfs_path(xid, pSesInfo , ref_path, cifs_sb->local_nls,
|
|
&num_referrals, &referrals,
|
|
cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
|
|
|
|
if (!rc && num_referrals > 0) {
|
|
char *fake_devname = NULL;
|
|
|
|
mdata = cifs_compose_mount_options(cifs_sb->mountdata,
|
|
full_path + 1, referrals,
|
|
&fake_devname);
|
|
|
|
free_dfs_info_array(referrals, num_referrals);
|
|
|
|
if (IS_ERR(mdata)) {
|
|
rc = PTR_ERR(mdata);
|
|
mdata = NULL;
|
|
} else {
|
|
cleanup_volume_info_contents(volume_info);
|
|
memset(volume_info, '\0', sizeof(*volume_info));
|
|
rc = cifs_setup_volume_info(volume_info, mdata,
|
|
fake_devname);
|
|
}
|
|
kfree(fake_devname);
|
|
kfree(cifs_sb->mountdata);
|
|
cifs_sb->mountdata = mdata;
|
|
}
|
|
kfree(full_path);
|
|
return rc;
|
|
}
|
|
#endif
|
|
|
|
static int
|
|
cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
|
|
const char *devname)
|
|
{
|
|
int rc = 0;
|
|
|
|
if (cifs_parse_mount_options(mount_data, devname, volume_info))
|
|
return -EINVAL;
|
|
|
|
|
|
if (volume_info->nullauth) {
|
|
cFYI(1, "Anonymous login");
|
|
kfree(volume_info->username);
|
|
volume_info->username = NULL;
|
|
} else if (volume_info->username) {
|
|
/* BB fixme parse for domain name here */
|
|
cFYI(1, "Username: %s", volume_info->username);
|
|
} else {
|
|
cifserror("No username specified");
|
|
/* In userspace mount helper we can get user name from alternate
|
|
locations such as env variables and files on disk */
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* this is needed for ASCII cp to Unicode converts */
|
|
if (volume_info->iocharset == NULL) {
|
|
/* load_nls_default cannot return null */
|
|
volume_info->local_nls = load_nls_default();
|
|
} else {
|
|
volume_info->local_nls = load_nls(volume_info->iocharset);
|
|
if (volume_info->local_nls == NULL) {
|
|
cERROR(1, "CIFS mount error: iocharset %s not found",
|
|
volume_info->iocharset);
|
|
return -ELIBACC;
|
|
}
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
struct smb_vol *
|
|
cifs_get_volume_info(char *mount_data, const char *devname)
|
|
{
|
|
int rc;
|
|
struct smb_vol *volume_info;
|
|
|
|
volume_info = kzalloc(sizeof(struct smb_vol), GFP_KERNEL);
|
|
if (!volume_info)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
rc = cifs_setup_volume_info(volume_info, mount_data, devname);
|
|
if (rc) {
|
|
cifs_cleanup_volume_info(volume_info);
|
|
volume_info = ERR_PTR(rc);
|
|
}
|
|
|
|
return volume_info;
|
|
}
|
|
|
|
int
|
|
cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *volume_info)
|
|
{
|
|
int rc;
|
|
int xid;
|
|
struct cifs_ses *pSesInfo;
|
|
struct cifs_tcon *tcon;
|
|
struct TCP_Server_Info *srvTcp;
|
|
char *full_path;
|
|
struct tcon_link *tlink;
|
|
#ifdef CONFIG_CIFS_DFS_UPCALL
|
|
int referral_walks_count = 0;
|
|
#endif
|
|
|
|
rc = bdi_setup_and_register(&cifs_sb->bdi, "cifs", BDI_CAP_MAP_COPY);
|
|
if (rc)
|
|
return rc;
|
|
|
|
#ifdef CONFIG_CIFS_DFS_UPCALL
|
|
try_mount_again:
|
|
/* cleanup activities if we're chasing a referral */
|
|
if (referral_walks_count) {
|
|
if (tcon)
|
|
cifs_put_tcon(tcon);
|
|
else if (pSesInfo)
|
|
cifs_put_smb_ses(pSesInfo);
|
|
|
|
FreeXid(xid);
|
|
}
|
|
#endif
|
|
rc = 0;
|
|
tcon = NULL;
|
|
pSesInfo = NULL;
|
|
srvTcp = NULL;
|
|
full_path = NULL;
|
|
tlink = NULL;
|
|
|
|
xid = GetXid();
|
|
|
|
/* get a reference to a tcp session */
|
|
srvTcp = cifs_get_tcp_session(volume_info);
|
|
if (IS_ERR(srvTcp)) {
|
|
rc = PTR_ERR(srvTcp);
|
|
bdi_destroy(&cifs_sb->bdi);
|
|
goto out;
|
|
}
|
|
|
|
/* get a reference to a SMB session */
|
|
pSesInfo = cifs_get_smb_ses(srvTcp, volume_info);
|
|
if (IS_ERR(pSesInfo)) {
|
|
rc = PTR_ERR(pSesInfo);
|
|
pSesInfo = NULL;
|
|
goto mount_fail_check;
|
|
}
|
|
|
|
/* search for existing tcon to this server share */
|
|
tcon = cifs_get_tcon(pSesInfo, volume_info);
|
|
if (IS_ERR(tcon)) {
|
|
rc = PTR_ERR(tcon);
|
|
tcon = NULL;
|
|
goto remote_path_check;
|
|
}
|
|
|
|
/* tell server which Unix caps we support */
|
|
if (tcon->ses->capabilities & CAP_UNIX) {
|
|
/* reset of caps checks mount to see if unix extensions
|
|
disabled for just this mount */
|
|
reset_cifs_unix_caps(xid, tcon, cifs_sb, volume_info);
|
|
if ((tcon->ses->server->tcpStatus == CifsNeedReconnect) &&
|
|
(le64_to_cpu(tcon->fsUnixInfo.Capability) &
|
|
CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)) {
|
|
rc = -EACCES;
|
|
goto mount_fail_check;
|
|
}
|
|
} else
|
|
tcon->unix_ext = 0; /* server does not support them */
|
|
|
|
/* do not care if following two calls succeed - informational */
|
|
if (!tcon->ipc) {
|
|
CIFSSMBQFSDeviceInfo(xid, tcon);
|
|
CIFSSMBQFSAttributeInfo(xid, tcon);
|
|
}
|
|
|
|
cifs_sb->wsize = cifs_negotiate_wsize(tcon, volume_info);
|
|
cifs_sb->rsize = cifs_negotiate_rsize(tcon, volume_info);
|
|
|
|
/* tune readahead according to rsize */
|
|
cifs_sb->bdi.ra_pages = cifs_sb->rsize / PAGE_CACHE_SIZE;
|
|
|
|
remote_path_check:
|
|
#ifdef CONFIG_CIFS_DFS_UPCALL
|
|
/*
|
|
* Perform an unconditional check for whether there are DFS
|
|
* referrals for this path without prefix, to provide support
|
|
* for DFS referrals from w2k8 servers which don't seem to respond
|
|
* with PATH_NOT_COVERED to requests that include the prefix.
|
|
* Chase the referral if found, otherwise continue normally.
|
|
*/
|
|
if (referral_walks_count == 0) {
|
|
int refrc = expand_dfs_referral(xid, pSesInfo, volume_info,
|
|
cifs_sb, false);
|
|
if (!refrc) {
|
|
referral_walks_count++;
|
|
goto try_mount_again;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/* check if a whole path is not remote */
|
|
if (!rc && tcon) {
|
|
/* build_path_to_root works only when we have a valid tcon */
|
|
full_path = cifs_build_path_to_root(volume_info, cifs_sb, tcon);
|
|
if (full_path == NULL) {
|
|
rc = -ENOMEM;
|
|
goto mount_fail_check;
|
|
}
|
|
rc = is_path_accessible(xid, tcon, cifs_sb, full_path);
|
|
if (rc != 0 && rc != -EREMOTE) {
|
|
kfree(full_path);
|
|
goto mount_fail_check;
|
|
}
|
|
kfree(full_path);
|
|
}
|
|
|
|
/* get referral if needed */
|
|
if (rc == -EREMOTE) {
|
|
#ifdef CONFIG_CIFS_DFS_UPCALL
|
|
if (referral_walks_count > MAX_NESTED_LINKS) {
|
|
/*
|
|
* BB: when we implement proper loop detection,
|
|
* we will remove this check. But now we need it
|
|
* to prevent an indefinite loop if 'DFS tree' is
|
|
* misconfigured (i.e. has loops).
|
|
*/
|
|
rc = -ELOOP;
|
|
goto mount_fail_check;
|
|
}
|
|
|
|
rc = expand_dfs_referral(xid, pSesInfo, volume_info, cifs_sb,
|
|
true);
|
|
|
|
if (!rc) {
|
|
referral_walks_count++;
|
|
goto try_mount_again;
|
|
}
|
|
goto mount_fail_check;
|
|
#else /* No DFS support, return error on mount */
|
|
rc = -EOPNOTSUPP;
|
|
#endif
|
|
}
|
|
|
|
if (rc)
|
|
goto mount_fail_check;
|
|
|
|
/* now, hang the tcon off of the superblock */
|
|
tlink = kzalloc(sizeof *tlink, GFP_KERNEL);
|
|
if (tlink == NULL) {
|
|
rc = -ENOMEM;
|
|
goto mount_fail_check;
|
|
}
|
|
|
|
tlink->tl_uid = pSesInfo->linux_uid;
|
|
tlink->tl_tcon = tcon;
|
|
tlink->tl_time = jiffies;
|
|
set_bit(TCON_LINK_MASTER, &tlink->tl_flags);
|
|
set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
|
|
|
|
cifs_sb->master_tlink = tlink;
|
|
spin_lock(&cifs_sb->tlink_tree_lock);
|
|
tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
|
|
spin_unlock(&cifs_sb->tlink_tree_lock);
|
|
|
|
queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
|
|
TLINK_IDLE_EXPIRE);
|
|
|
|
mount_fail_check:
|
|
/* on error free sesinfo and tcon struct if needed */
|
|
if (rc) {
|
|
/* If find_unc succeeded then rc == 0 so we can not end */
|
|
/* up accidentally freeing someone elses tcon struct */
|
|
if (tcon)
|
|
cifs_put_tcon(tcon);
|
|
else if (pSesInfo)
|
|
cifs_put_smb_ses(pSesInfo);
|
|
else
|
|
cifs_put_tcp_session(srvTcp);
|
|
bdi_destroy(&cifs_sb->bdi);
|
|
}
|
|
|
|
out:
|
|
FreeXid(xid);
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* Issue a TREE_CONNECT request. Note that for IPC$ shares, that the tcon
|
|
* pointer may be NULL.
|
|
*/
|
|
int
|
|
CIFSTCon(unsigned int xid, struct cifs_ses *ses,
|
|
const char *tree, struct cifs_tcon *tcon,
|
|
const struct nls_table *nls_codepage)
|
|
{
|
|
struct smb_hdr *smb_buffer;
|
|
struct smb_hdr *smb_buffer_response;
|
|
TCONX_REQ *pSMB;
|
|
TCONX_RSP *pSMBr;
|
|
unsigned char *bcc_ptr;
|
|
int rc = 0;
|
|
int length;
|
|
__u16 bytes_left, count;
|
|
|
|
if (ses == NULL)
|
|
return -EIO;
|
|
|
|
smb_buffer = cifs_buf_get();
|
|
if (smb_buffer == NULL)
|
|
return -ENOMEM;
|
|
|
|
smb_buffer_response = smb_buffer;
|
|
|
|
header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
|
|
NULL /*no tid */ , 4 /*wct */ );
|
|
|
|
smb_buffer->Mid = get_next_mid(ses->server);
|
|
smb_buffer->Uid = ses->Suid;
|
|
pSMB = (TCONX_REQ *) smb_buffer;
|
|
pSMBr = (TCONX_RSP *) smb_buffer_response;
|
|
|
|
pSMB->AndXCommand = 0xFF;
|
|
pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
|
|
bcc_ptr = &pSMB->Password[0];
|
|
if (!tcon || (ses->server->sec_mode & SECMODE_USER)) {
|
|
pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
|
|
*bcc_ptr = 0; /* password is null byte */
|
|
bcc_ptr++; /* skip password */
|
|
/* already aligned so no need to do it below */
|
|
} else {
|
|
pSMB->PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
|
|
/* BB FIXME add code to fail this if NTLMv2 or Kerberos
|
|
specified as required (when that support is added to
|
|
the vfs in the future) as only NTLM or the much
|
|
weaker LANMAN (which we do not send by default) is accepted
|
|
by Samba (not sure whether other servers allow
|
|
NTLMv2 password here) */
|
|
#ifdef CONFIG_CIFS_WEAK_PW_HASH
|
|
if ((global_secflags & CIFSSEC_MAY_LANMAN) &&
|
|
(ses->server->secType == LANMAN))
|
|
calc_lanman_hash(tcon->password, ses->server->cryptkey,
|
|
ses->server->sec_mode &
|
|
SECMODE_PW_ENCRYPT ? true : false,
|
|
bcc_ptr);
|
|
else
|
|
#endif /* CIFS_WEAK_PW_HASH */
|
|
rc = SMBNTencrypt(tcon->password, ses->server->cryptkey,
|
|
bcc_ptr, nls_codepage);
|
|
|
|
bcc_ptr += CIFS_AUTH_RESP_SIZE;
|
|
if (ses->capabilities & CAP_UNICODE) {
|
|
/* must align unicode strings */
|
|
*bcc_ptr = 0; /* null byte password */
|
|
bcc_ptr++;
|
|
}
|
|
}
|
|
|
|
if (ses->server->sec_mode &
|
|
(SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
|
|
smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
|
|
|
|
if (ses->capabilities & CAP_STATUS32) {
|
|
smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
|
|
}
|
|
if (ses->capabilities & CAP_DFS) {
|
|
smb_buffer->Flags2 |= SMBFLG2_DFS;
|
|
}
|
|
if (ses->capabilities & CAP_UNICODE) {
|
|
smb_buffer->Flags2 |= SMBFLG2_UNICODE;
|
|
length =
|
|
cifs_strtoUTF16((__le16 *) bcc_ptr, tree,
|
|
6 /* max utf8 char length in bytes */ *
|
|
(/* server len*/ + 256 /* share len */), nls_codepage);
|
|
bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
|
|
bcc_ptr += 2; /* skip trailing null */
|
|
} else { /* ASCII */
|
|
strcpy(bcc_ptr, tree);
|
|
bcc_ptr += strlen(tree) + 1;
|
|
}
|
|
strcpy(bcc_ptr, "?????");
|
|
bcc_ptr += strlen("?????");
|
|
bcc_ptr += 1;
|
|
count = bcc_ptr - &pSMB->Password[0];
|
|
pSMB->hdr.smb_buf_length = cpu_to_be32(be32_to_cpu(
|
|
pSMB->hdr.smb_buf_length) + count);
|
|
pSMB->ByteCount = cpu_to_le16(count);
|
|
|
|
rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
|
|
0);
|
|
|
|
/* above now done in SendReceive */
|
|
if ((rc == 0) && (tcon != NULL)) {
|
|
bool is_unicode;
|
|
|
|
tcon->tidStatus = CifsGood;
|
|
tcon->need_reconnect = false;
|
|
tcon->tid = smb_buffer_response->Tid;
|
|
bcc_ptr = pByteArea(smb_buffer_response);
|
|
bytes_left = get_bcc(smb_buffer_response);
|
|
length = strnlen(bcc_ptr, bytes_left - 2);
|
|
if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
|
|
is_unicode = true;
|
|
else
|
|
is_unicode = false;
|
|
|
|
|
|
/* skip service field (NB: this field is always ASCII) */
|
|
if (length == 3) {
|
|
if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
|
|
(bcc_ptr[2] == 'C')) {
|
|
cFYI(1, "IPC connection");
|
|
tcon->ipc = 1;
|
|
}
|
|
} else if (length == 2) {
|
|
if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
|
|
/* the most common case */
|
|
cFYI(1, "disk share connection");
|
|
}
|
|
}
|
|
bcc_ptr += length + 1;
|
|
bytes_left -= (length + 1);
|
|
strncpy(tcon->treeName, tree, MAX_TREE_SIZE);
|
|
|
|
/* mostly informational -- no need to fail on error here */
|
|
kfree(tcon->nativeFileSystem);
|
|
tcon->nativeFileSystem = cifs_strndup_from_utf16(bcc_ptr,
|
|
bytes_left, is_unicode,
|
|
nls_codepage);
|
|
|
|
cFYI(1, "nativeFileSystem=%s", tcon->nativeFileSystem);
|
|
|
|
if ((smb_buffer_response->WordCount == 3) ||
|
|
(smb_buffer_response->WordCount == 7))
|
|
/* field is in same location */
|
|
tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
|
|
else
|
|
tcon->Flags = 0;
|
|
cFYI(1, "Tcon flags: 0x%x ", tcon->Flags);
|
|
} else if ((rc == 0) && tcon == NULL) {
|
|
/* all we need to save for IPC$ connection */
|
|
ses->ipc_tid = smb_buffer_response->Tid;
|
|
}
|
|
|
|
cifs_buf_release(smb_buffer);
|
|
return rc;
|
|
}
|
|
|
|
void
|
|
cifs_umount(struct cifs_sb_info *cifs_sb)
|
|
{
|
|
struct rb_root *root = &cifs_sb->tlink_tree;
|
|
struct rb_node *node;
|
|
struct tcon_link *tlink;
|
|
|
|
cancel_delayed_work_sync(&cifs_sb->prune_tlinks);
|
|
|
|
spin_lock(&cifs_sb->tlink_tree_lock);
|
|
while ((node = rb_first(root))) {
|
|
tlink = rb_entry(node, struct tcon_link, tl_rbnode);
|
|
cifs_get_tlink(tlink);
|
|
clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
|
|
rb_erase(node, root);
|
|
|
|
spin_unlock(&cifs_sb->tlink_tree_lock);
|
|
cifs_put_tlink(tlink);
|
|
spin_lock(&cifs_sb->tlink_tree_lock);
|
|
}
|
|
spin_unlock(&cifs_sb->tlink_tree_lock);
|
|
|
|
bdi_destroy(&cifs_sb->bdi);
|
|
kfree(cifs_sb->mountdata);
|
|
unload_nls(cifs_sb->local_nls);
|
|
kfree(cifs_sb);
|
|
}
|
|
|
|
int cifs_negotiate_protocol(unsigned int xid, struct cifs_ses *ses)
|
|
{
|
|
int rc = 0;
|
|
struct TCP_Server_Info *server = ses->server;
|
|
|
|
/* only send once per connect */
|
|
if (server->maxBuf != 0)
|
|
return 0;
|
|
|
|
set_credits(server, 1);
|
|
rc = CIFSSMBNegotiate(xid, ses);
|
|
if (rc == -EAGAIN) {
|
|
/* retry only once on 1st time connection */
|
|
set_credits(server, 1);
|
|
rc = CIFSSMBNegotiate(xid, ses);
|
|
if (rc == -EAGAIN)
|
|
rc = -EHOSTDOWN;
|
|
}
|
|
if (rc == 0) {
|
|
spin_lock(&GlobalMid_Lock);
|
|
if (server->tcpStatus == CifsNeedNegotiate)
|
|
server->tcpStatus = CifsGood;
|
|
else
|
|
rc = -EHOSTDOWN;
|
|
spin_unlock(&GlobalMid_Lock);
|
|
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
|
|
int cifs_setup_session(unsigned int xid, struct cifs_ses *ses,
|
|
struct nls_table *nls_info)
|
|
{
|
|
int rc = 0;
|
|
struct TCP_Server_Info *server = ses->server;
|
|
|
|
ses->flags = 0;
|
|
ses->capabilities = server->capabilities;
|
|
if (linuxExtEnabled == 0)
|
|
ses->capabilities &= (~CAP_UNIX);
|
|
|
|
cFYI(1, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d",
|
|
server->sec_mode, server->capabilities, server->timeAdj);
|
|
|
|
rc = CIFS_SessSetup(xid, ses, nls_info);
|
|
if (rc) {
|
|
cERROR(1, "Send error in SessSetup = %d", rc);
|
|
} else {
|
|
mutex_lock(&ses->server->srv_mutex);
|
|
if (!server->session_estab) {
|
|
server->session_key.response = ses->auth_key.response;
|
|
server->session_key.len = ses->auth_key.len;
|
|
server->sequence_number = 0x2;
|
|
server->session_estab = true;
|
|
ses->auth_key.response = NULL;
|
|
}
|
|
mutex_unlock(&server->srv_mutex);
|
|
|
|
cFYI(1, "CIFS Session Established successfully");
|
|
spin_lock(&GlobalMid_Lock);
|
|
ses->status = CifsGood;
|
|
ses->need_reconnect = false;
|
|
spin_unlock(&GlobalMid_Lock);
|
|
}
|
|
|
|
kfree(ses->auth_key.response);
|
|
ses->auth_key.response = NULL;
|
|
ses->auth_key.len = 0;
|
|
kfree(ses->ntlmssp);
|
|
ses->ntlmssp = NULL;
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int
|
|
cifs_set_vol_auth(struct smb_vol *vol, struct cifs_ses *ses)
|
|
{
|
|
switch (ses->server->secType) {
|
|
case Kerberos:
|
|
vol->secFlg = CIFSSEC_MUST_KRB5;
|
|
return 0;
|
|
case NTLMv2:
|
|
vol->secFlg = CIFSSEC_MUST_NTLMV2;
|
|
break;
|
|
case NTLM:
|
|
vol->secFlg = CIFSSEC_MUST_NTLM;
|
|
break;
|
|
case RawNTLMSSP:
|
|
vol->secFlg = CIFSSEC_MUST_NTLMSSP;
|
|
break;
|
|
case LANMAN:
|
|
vol->secFlg = CIFSSEC_MUST_LANMAN;
|
|
break;
|
|
}
|
|
|
|
return cifs_set_cifscreds(vol, ses);
|
|
}
|
|
|
|
static struct cifs_tcon *
|
|
cifs_construct_tcon(struct cifs_sb_info *cifs_sb, uid_t fsuid)
|
|
{
|
|
int rc;
|
|
struct cifs_tcon *master_tcon = cifs_sb_master_tcon(cifs_sb);
|
|
struct cifs_ses *ses;
|
|
struct cifs_tcon *tcon = NULL;
|
|
struct smb_vol *vol_info;
|
|
|
|
vol_info = kzalloc(sizeof(*vol_info), GFP_KERNEL);
|
|
if (vol_info == NULL)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
vol_info->local_nls = cifs_sb->local_nls;
|
|
vol_info->linux_uid = fsuid;
|
|
vol_info->cred_uid = fsuid;
|
|
vol_info->UNC = master_tcon->treeName;
|
|
vol_info->retry = master_tcon->retry;
|
|
vol_info->nocase = master_tcon->nocase;
|
|
vol_info->local_lease = master_tcon->local_lease;
|
|
vol_info->no_linux_ext = !master_tcon->unix_ext;
|
|
|
|
rc = cifs_set_vol_auth(vol_info, master_tcon->ses);
|
|
if (rc) {
|
|
tcon = ERR_PTR(rc);
|
|
goto out;
|
|
}
|
|
|
|
/* get a reference for the same TCP session */
|
|
spin_lock(&cifs_tcp_ses_lock);
|
|
++master_tcon->ses->server->srv_count;
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
|
|
ses = cifs_get_smb_ses(master_tcon->ses->server, vol_info);
|
|
if (IS_ERR(ses)) {
|
|
tcon = (struct cifs_tcon *)ses;
|
|
cifs_put_tcp_session(master_tcon->ses->server);
|
|
goto out;
|
|
}
|
|
|
|
tcon = cifs_get_tcon(ses, vol_info);
|
|
if (IS_ERR(tcon)) {
|
|
cifs_put_smb_ses(ses);
|
|
goto out;
|
|
}
|
|
|
|
if (ses->capabilities & CAP_UNIX)
|
|
reset_cifs_unix_caps(0, tcon, NULL, vol_info);
|
|
out:
|
|
kfree(vol_info->username);
|
|
kfree(vol_info->password);
|
|
kfree(vol_info);
|
|
|
|
return tcon;
|
|
}
|
|
|
|
struct cifs_tcon *
|
|
cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
|
|
{
|
|
return tlink_tcon(cifs_sb_master_tlink(cifs_sb));
|
|
}
|
|
|
|
static int
|
|
cifs_sb_tcon_pending_wait(void *unused)
|
|
{
|
|
schedule();
|
|
return signal_pending(current) ? -ERESTARTSYS : 0;
|
|
}
|
|
|
|
/* find and return a tlink with given uid */
|
|
static struct tcon_link *
|
|
tlink_rb_search(struct rb_root *root, uid_t uid)
|
|
{
|
|
struct rb_node *node = root->rb_node;
|
|
struct tcon_link *tlink;
|
|
|
|
while (node) {
|
|
tlink = rb_entry(node, struct tcon_link, tl_rbnode);
|
|
|
|
if (tlink->tl_uid > uid)
|
|
node = node->rb_left;
|
|
else if (tlink->tl_uid < uid)
|
|
node = node->rb_right;
|
|
else
|
|
return tlink;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/* insert a tcon_link into the tree */
|
|
static void
|
|
tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink)
|
|
{
|
|
struct rb_node **new = &(root->rb_node), *parent = NULL;
|
|
struct tcon_link *tlink;
|
|
|
|
while (*new) {
|
|
tlink = rb_entry(*new, struct tcon_link, tl_rbnode);
|
|
parent = *new;
|
|
|
|
if (tlink->tl_uid > new_tlink->tl_uid)
|
|
new = &((*new)->rb_left);
|
|
else
|
|
new = &((*new)->rb_right);
|
|
}
|
|
|
|
rb_link_node(&new_tlink->tl_rbnode, parent, new);
|
|
rb_insert_color(&new_tlink->tl_rbnode, root);
|
|
}
|
|
|
|
/*
|
|
* Find or construct an appropriate tcon given a cifs_sb and the fsuid of the
|
|
* current task.
|
|
*
|
|
* If the superblock doesn't refer to a multiuser mount, then just return
|
|
* the master tcon for the mount.
|
|
*
|
|
* First, search the rbtree for an existing tcon for this fsuid. If one
|
|
* exists, then check to see if it's pending construction. If it is then wait
|
|
* for construction to complete. Once it's no longer pending, check to see if
|
|
* it failed and either return an error or retry construction, depending on
|
|
* the timeout.
|
|
*
|
|
* If one doesn't exist then insert a new tcon_link struct into the tree and
|
|
* try to construct a new one.
|
|
*/
|
|
struct tcon_link *
|
|
cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
|
|
{
|
|
int ret;
|
|
uid_t fsuid = current_fsuid();
|
|
struct tcon_link *tlink, *newtlink;
|
|
|
|
if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
|
|
return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
|
|
|
|
spin_lock(&cifs_sb->tlink_tree_lock);
|
|
tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
|
|
if (tlink)
|
|
cifs_get_tlink(tlink);
|
|
spin_unlock(&cifs_sb->tlink_tree_lock);
|
|
|
|
if (tlink == NULL) {
|
|
newtlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
|
|
if (newtlink == NULL)
|
|
return ERR_PTR(-ENOMEM);
|
|
newtlink->tl_uid = fsuid;
|
|
newtlink->tl_tcon = ERR_PTR(-EACCES);
|
|
set_bit(TCON_LINK_PENDING, &newtlink->tl_flags);
|
|
set_bit(TCON_LINK_IN_TREE, &newtlink->tl_flags);
|
|
cifs_get_tlink(newtlink);
|
|
|
|
spin_lock(&cifs_sb->tlink_tree_lock);
|
|
/* was one inserted after previous search? */
|
|
tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
|
|
if (tlink) {
|
|
cifs_get_tlink(tlink);
|
|
spin_unlock(&cifs_sb->tlink_tree_lock);
|
|
kfree(newtlink);
|
|
goto wait_for_construction;
|
|
}
|
|
tlink = newtlink;
|
|
tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
|
|
spin_unlock(&cifs_sb->tlink_tree_lock);
|
|
} else {
|
|
wait_for_construction:
|
|
ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING,
|
|
cifs_sb_tcon_pending_wait,
|
|
TASK_INTERRUPTIBLE);
|
|
if (ret) {
|
|
cifs_put_tlink(tlink);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
/* if it's good, return it */
|
|
if (!IS_ERR(tlink->tl_tcon))
|
|
return tlink;
|
|
|
|
/* return error if we tried this already recently */
|
|
if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) {
|
|
cifs_put_tlink(tlink);
|
|
return ERR_PTR(-EACCES);
|
|
}
|
|
|
|
if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags))
|
|
goto wait_for_construction;
|
|
}
|
|
|
|
tlink->tl_tcon = cifs_construct_tcon(cifs_sb, fsuid);
|
|
clear_bit(TCON_LINK_PENDING, &tlink->tl_flags);
|
|
wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING);
|
|
|
|
if (IS_ERR(tlink->tl_tcon)) {
|
|
cifs_put_tlink(tlink);
|
|
return ERR_PTR(-EACCES);
|
|
}
|
|
|
|
return tlink;
|
|
}
|
|
|
|
/*
|
|
* periodic workqueue job that scans tcon_tree for a superblock and closes
|
|
* out tcons.
|
|
*/
|
|
static void
|
|
cifs_prune_tlinks(struct work_struct *work)
|
|
{
|
|
struct cifs_sb_info *cifs_sb = container_of(work, struct cifs_sb_info,
|
|
prune_tlinks.work);
|
|
struct rb_root *root = &cifs_sb->tlink_tree;
|
|
struct rb_node *node = rb_first(root);
|
|
struct rb_node *tmp;
|
|
struct tcon_link *tlink;
|
|
|
|
/*
|
|
* Because we drop the spinlock in the loop in order to put the tlink
|
|
* it's not guarded against removal of links from the tree. The only
|
|
* places that remove entries from the tree are this function and
|
|
* umounts. Because this function is non-reentrant and is canceled
|
|
* before umount can proceed, this is safe.
|
|
*/
|
|
spin_lock(&cifs_sb->tlink_tree_lock);
|
|
node = rb_first(root);
|
|
while (node != NULL) {
|
|
tmp = node;
|
|
node = rb_next(tmp);
|
|
tlink = rb_entry(tmp, struct tcon_link, tl_rbnode);
|
|
|
|
if (test_bit(TCON_LINK_MASTER, &tlink->tl_flags) ||
|
|
atomic_read(&tlink->tl_count) != 0 ||
|
|
time_after(tlink->tl_time + TLINK_IDLE_EXPIRE, jiffies))
|
|
continue;
|
|
|
|
cifs_get_tlink(tlink);
|
|
clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
|
|
rb_erase(tmp, root);
|
|
|
|
spin_unlock(&cifs_sb->tlink_tree_lock);
|
|
cifs_put_tlink(tlink);
|
|
spin_lock(&cifs_sb->tlink_tree_lock);
|
|
}
|
|
spin_unlock(&cifs_sb->tlink_tree_lock);
|
|
|
|
queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
|
|
TLINK_IDLE_EXPIRE);
|
|
}
|