forked from Minki/linux
c592a70737
When ntlm security mechanim is used, the message that warns about the upgrade to ntlmv2 got the kernel release version wrong (Blame it on Linus :). Fix it. Signed-off-by: Suresh Jayaraman <sjayaraman@suse.de> Reviewed-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
3683 lines
103 KiB
C
3683 lines
103 KiB
C
/*
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* fs/cifs/connect.c
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*
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* Copyright (C) International Business Machines Corp., 2002,2009
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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 <net/ipv6.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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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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/*
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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->midState == MID_REQUEST_SUBMITTED)
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mid_entry->midState = 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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while (server->tcpStatus == CifsNeedReconnect) {
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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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}
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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(struct smb_hdr *pSMB, unsigned int maxBufSize)
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{
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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 > maxBufSize) {
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cERROR(1, "TotalDataSize %d is over maximum buffer %d",
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total_data_size, maxBufSize);
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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(struct smb_hdr *psecond, struct smb_hdr *pTargetSMB)
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{
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struct smb_t2_rsp *pSMB2 = (struct smb_t2_rsp *)psecond;
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struct smb_t2_rsp *pSMBt = (struct smb_t2_rsp *)pTargetSMB;
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char *data_area_of_target;
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char *data_area_of_buf2;
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int remaining;
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unsigned int byte_count, total_in_buf;
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__u16 total_data_size, total_in_buf2;
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total_data_size = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount);
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if (total_data_size !=
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get_unaligned_le16(&pSMB2->t2_rsp.TotalDataCount))
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cFYI(1, "total data size of primary and secondary t2 differ");
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total_in_buf = get_unaligned_le16(&pSMBt->t2_rsp.DataCount);
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remaining = total_data_size - total_in_buf;
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if (remaining < 0)
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return -EPROTO;
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if (remaining == 0) /* nothing to do, ignore */
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return 0;
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total_in_buf2 = get_unaligned_le16(&pSMB2->t2_rsp.DataCount);
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if (remaining < total_in_buf2) {
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cFYI(1, "transact2 2nd response contains too much data");
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}
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/* find end of first SMB data area */
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data_area_of_target = (char *)&pSMBt->hdr.Protocol +
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get_unaligned_le16(&pSMBt->t2_rsp.DataOffset);
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/* validate target area */
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data_area_of_buf2 = (char *)&pSMB2->hdr.Protocol +
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get_unaligned_le16(&pSMB2->t2_rsp.DataOffset);
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data_area_of_target += total_in_buf;
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/* copy second buffer into end of first buffer */
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total_in_buf += total_in_buf2;
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/* is the result too big for the field? */
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if (total_in_buf > USHRT_MAX)
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return -EPROTO;
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put_unaligned_le16(total_in_buf, &pSMBt->t2_rsp.DataCount);
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/* fix up the BCC */
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byte_count = get_bcc(pTargetSMB);
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byte_count += total_in_buf2;
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/* is the result too big for the field? */
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if (byte_count > USHRT_MAX)
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return -EPROTO;
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put_bcc(byte_count, pTargetSMB);
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byte_count = be32_to_cpu(pTargetSMB->smb_buf_length);
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byte_count += total_in_buf2;
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/* don't allow buffer to overflow */
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if (byte_count > CIFSMaxBufSize)
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return -ENOBUFS;
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pTargetSMB->smb_buf_length = cpu_to_be32(byte_count);
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memcpy(data_area_of_target, data_area_of_buf2, total_in_buf2);
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if (remaining == total_in_buf2) {
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cFYI(1, "found the last secondary response");
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return 0; /* we are done */
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} else /* more responses to go */
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return 1;
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}
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static void
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cifs_echo_request(struct work_struct *work)
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{
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int rc;
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struct TCP_Server_Info *server = container_of(work,
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struct TCP_Server_Info, echo.work);
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/*
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* We cannot send an echo until the NEGOTIATE_PROTOCOL request is
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* done, which is indicated by maxBuf != 0. Also, no need to ping if
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* we got a response recently
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*/
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if (server->maxBuf == 0 ||
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time_before(jiffies, server->lstrp + SMB_ECHO_INTERVAL - HZ))
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goto requeue_echo;
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rc = CIFSSMBEcho(server);
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if (rc)
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cFYI(1, "Unable to send echo request to server: %s",
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server->hostname);
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requeue_echo:
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queue_delayed_work(system_nrt_wq, &server->echo, SMB_ECHO_INTERVAL);
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}
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static int
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cifs_demultiplex_thread(struct TCP_Server_Info *server)
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{
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int length;
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unsigned int pdu_length, total_read;
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struct smb_hdr *smb_buffer = NULL;
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struct smb_hdr *bigbuf = NULL;
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struct smb_hdr *smallbuf = NULL;
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struct msghdr smb_msg;
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struct kvec iov;
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struct socket *csocket = server->ssocket;
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struct list_head *tmp, *tmp2;
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struct task_struct *task_to_wake = NULL;
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struct mid_q_entry *mid_entry;
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char temp;
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bool isLargeBuf = false;
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bool isMultiRsp;
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int reconnect;
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current->flags |= PF_MEMALLOC;
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cFYI(1, "Demultiplex PID: %d", task_pid_nr(current));
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length = atomic_inc_return(&tcpSesAllocCount);
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if (length > 1)
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mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
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GFP_KERNEL);
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set_freezable();
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while (server->tcpStatus != CifsExiting) {
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if (try_to_freeze())
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continue;
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if (bigbuf == NULL) {
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bigbuf = cifs_buf_get();
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if (!bigbuf) {
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cERROR(1, "No memory for large SMB response");
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msleep(3000);
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/* retry will check if exiting */
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continue;
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}
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} else if (isLargeBuf) {
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/* we are reusing a dirty large buf, clear its start */
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memset(bigbuf, 0, sizeof(struct smb_hdr));
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}
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if (smallbuf == NULL) {
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smallbuf = cifs_small_buf_get();
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if (!smallbuf) {
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cERROR(1, "No memory for SMB response");
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msleep(1000);
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/* retry will check if exiting */
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continue;
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}
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/* beginning of smb buffer is cleared in our buf_get */
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} else /* if existing small buf clear beginning */
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memset(smallbuf, 0, sizeof(struct smb_hdr));
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isLargeBuf = false;
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isMultiRsp = false;
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smb_buffer = smallbuf;
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iov.iov_base = smb_buffer;
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iov.iov_len = 4;
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smb_msg.msg_control = NULL;
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smb_msg.msg_controllen = 0;
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pdu_length = 4; /* enough to get RFC1001 header */
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incomplete_rcv:
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if (echo_retries > 0 && server->tcpStatus == CifsGood &&
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time_after(jiffies, server->lstrp +
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(echo_retries * SMB_ECHO_INTERVAL))) {
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cERROR(1, "Server %s has not responded in %d seconds. "
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"Reconnecting...", server->hostname,
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(echo_retries * SMB_ECHO_INTERVAL / HZ));
|
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cifs_reconnect(server);
|
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csocket = server->ssocket;
|
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wake_up(&server->response_q);
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continue;
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}
|
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|
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length =
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kernel_recvmsg(csocket, &smb_msg,
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&iov, 1, pdu_length, 0 /* BB other flags? */);
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|
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if (server->tcpStatus == CifsExiting) {
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break;
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} else if (server->tcpStatus == CifsNeedReconnect) {
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cFYI(1, "Reconnect after server stopped responding");
|
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cifs_reconnect(server);
|
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cFYI(1, "call to reconnect done");
|
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csocket = server->ssocket;
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continue;
|
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} else if (length == -ERESTARTSYS ||
|
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length == -EAGAIN ||
|
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length == -EINTR) {
|
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msleep(1); /* minimum sleep to prevent looping
|
|
allowing socket to clear and app threads to set
|
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tcpStatus CifsNeedReconnect if server hung */
|
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if (pdu_length < 4) {
|
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iov.iov_base = (4 - pdu_length) +
|
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(char *)smb_buffer;
|
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iov.iov_len = pdu_length;
|
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smb_msg.msg_control = NULL;
|
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smb_msg.msg_controllen = 0;
|
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goto incomplete_rcv;
|
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} else
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continue;
|
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} else if (length <= 0) {
|
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cFYI(1, "Reconnect after unexpected peek error %d",
|
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length);
|
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cifs_reconnect(server);
|
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csocket = server->ssocket;
|
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wake_up(&server->response_q);
|
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continue;
|
|
} else if (length < pdu_length) {
|
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cFYI(1, "requested %d bytes but only got %d bytes",
|
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pdu_length, length);
|
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pdu_length -= length;
|
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msleep(1);
|
|
goto incomplete_rcv;
|
|
}
|
|
|
|
/* The right amount was read from socket - 4 bytes */
|
|
/* so we can now interpret the length field */
|
|
|
|
/* the first byte big endian of the length field,
|
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is actually not part of the length but the type
|
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with the most common, zero, as regular data */
|
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temp = *((char *) smb_buffer);
|
|
|
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/* Note that FC 1001 length is big endian on the wire,
|
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but we convert it here so it is always manipulated
|
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as host byte order */
|
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pdu_length = be32_to_cpu(smb_buffer->smb_buf_length);
|
|
|
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cFYI(1, "rfc1002 length 0x%x", pdu_length+4);
|
|
|
|
if (temp == (char) RFC1002_SESSION_KEEP_ALIVE) {
|
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continue;
|
|
} else if (temp == (char)RFC1002_POSITIVE_SESSION_RESPONSE) {
|
|
cFYI(1, "Good RFC 1002 session rsp");
|
|
continue;
|
|
} else if (temp == (char)RFC1002_NEGATIVE_SESSION_RESPONSE) {
|
|
/* we get this from Windows 98 instead of
|
|
an error on SMB negprot response */
|
|
cFYI(1, "Negative RFC1002 Session Response Error 0x%x)",
|
|
pdu_length);
|
|
/* 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);
|
|
csocket = server->ssocket;
|
|
wake_up(&server->response_q);
|
|
continue;
|
|
} else if (temp != (char) 0) {
|
|
cERROR(1, "Unknown RFC 1002 frame");
|
|
cifs_dump_mem(" Received Data: ", (char *)smb_buffer,
|
|
length);
|
|
cifs_reconnect(server);
|
|
csocket = server->ssocket;
|
|
continue;
|
|
}
|
|
|
|
/* else we have an SMB response */
|
|
if ((pdu_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) ||
|
|
(pdu_length < sizeof(struct smb_hdr) - 1 - 4)) {
|
|
cERROR(1, "Invalid size SMB length %d pdu_length %d",
|
|
length, pdu_length+4);
|
|
cifs_reconnect(server);
|
|
csocket = server->ssocket;
|
|
wake_up(&server->response_q);
|
|
continue;
|
|
}
|
|
|
|
/* else length ok */
|
|
reconnect = 0;
|
|
|
|
if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
|
|
isLargeBuf = true;
|
|
memcpy(bigbuf, smallbuf, 4);
|
|
smb_buffer = bigbuf;
|
|
}
|
|
length = 0;
|
|
iov.iov_base = 4 + (char *)smb_buffer;
|
|
iov.iov_len = pdu_length;
|
|
for (total_read = 0; total_read < pdu_length;
|
|
total_read += length) {
|
|
length = kernel_recvmsg(csocket, &smb_msg, &iov, 1,
|
|
pdu_length - total_read, 0);
|
|
if (server->tcpStatus == CifsExiting) {
|
|
/* then will exit */
|
|
reconnect = 2;
|
|
break;
|
|
} else if (server->tcpStatus == CifsNeedReconnect) {
|
|
cifs_reconnect(server);
|
|
csocket = server->ssocket;
|
|
/* Reconnect wakes up rspns q */
|
|
/* Now we will reread sock */
|
|
reconnect = 1;
|
|
break;
|
|
} else if (length == -ERESTARTSYS ||
|
|
length == -EAGAIN ||
|
|
length == -EINTR) {
|
|
msleep(1); /* minimum sleep to prevent looping,
|
|
allowing socket to clear and app
|
|
threads to set tcpStatus
|
|
CifsNeedReconnect if server hung*/
|
|
length = 0;
|
|
continue;
|
|
} else if (length <= 0) {
|
|
cERROR(1, "Received no data, expecting %d",
|
|
pdu_length - total_read);
|
|
cifs_reconnect(server);
|
|
csocket = server->ssocket;
|
|
reconnect = 1;
|
|
break;
|
|
}
|
|
}
|
|
if (reconnect == 2)
|
|
break;
|
|
else if (reconnect == 1)
|
|
continue;
|
|
|
|
total_read += 4; /* account for rfc1002 hdr */
|
|
|
|
dump_smb(smb_buffer, 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 = checkSMB(smb_buffer, smb_buffer->Mid, total_read);
|
|
if (length != 0)
|
|
cifs_dump_mem("Bad SMB: ", smb_buffer,
|
|
min_t(unsigned int, total_read, 48));
|
|
|
|
mid_entry = NULL;
|
|
server->lstrp = jiffies;
|
|
|
|
spin_lock(&GlobalMid_Lock);
|
|
list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
|
|
mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
|
|
|
|
if (mid_entry->mid != smb_buffer->Mid ||
|
|
mid_entry->midState != MID_REQUEST_SUBMITTED ||
|
|
mid_entry->command != smb_buffer->Command) {
|
|
mid_entry = NULL;
|
|
continue;
|
|
}
|
|
|
|
if (length == 0 &&
|
|
check2ndT2(smb_buffer, server->maxBuf) > 0) {
|
|
/* We have a multipart transact2 resp */
|
|
isMultiRsp = true;
|
|
if (mid_entry->resp_buf) {
|
|
/* merge response - fix up 1st*/
|
|
length = coalesce_t2(smb_buffer,
|
|
mid_entry->resp_buf);
|
|
if (length > 0) {
|
|
length = 0;
|
|
mid_entry->multiRsp = true;
|
|
break;
|
|
} else {
|
|
/* all parts received or
|
|
* packet is malformed
|
|
*/
|
|
mid_entry->multiEnd = true;
|
|
goto multi_t2_fnd;
|
|
}
|
|
} else {
|
|
if (!isLargeBuf) {
|
|
/*
|
|
* FIXME: switch to already
|
|
* allocated largebuf?
|
|
*/
|
|
cERROR(1, "1st trans2 resp "
|
|
"needs bigbuf");
|
|
} else {
|
|
/* Have first buffer */
|
|
mid_entry->resp_buf =
|
|
smb_buffer;
|
|
mid_entry->largeBuf = true;
|
|
bigbuf = NULL;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
mid_entry->resp_buf = smb_buffer;
|
|
mid_entry->largeBuf = isLargeBuf;
|
|
multi_t2_fnd:
|
|
if (length == 0)
|
|
mid_entry->midState = MID_RESPONSE_RECEIVED;
|
|
else
|
|
mid_entry->midState = MID_RESPONSE_MALFORMED;
|
|
#ifdef CONFIG_CIFS_STATS2
|
|
mid_entry->when_received = jiffies;
|
|
#endif
|
|
list_del_init(&mid_entry->qhead);
|
|
break;
|
|
}
|
|
spin_unlock(&GlobalMid_Lock);
|
|
|
|
if (mid_entry != NULL) {
|
|
mid_entry->callback(mid_entry);
|
|
/* Was previous buf put in mpx struct for multi-rsp? */
|
|
if (!isMultiRsp) {
|
|
/* smb buffer will be freed by user thread */
|
|
if (isLargeBuf)
|
|
bigbuf = NULL;
|
|
else
|
|
smallbuf = NULL;
|
|
}
|
|
} else if (length != 0) {
|
|
/* response sanity checks failed */
|
|
continue;
|
|
} else if (!is_valid_oplock_break(smb_buffer, server) &&
|
|
!isMultiRsp) {
|
|
cERROR(1, "No task to wake, unknown frame received! "
|
|
"NumMids %d", atomic_read(&midCount));
|
|
cifs_dump_mem("Received Data is: ", (char *)smb_buffer,
|
|
sizeof(struct smb_hdr));
|
|
#ifdef CONFIG_CIFS_DEBUG2
|
|
cifs_dump_detail(smb_buffer);
|
|
cifs_dump_mids(server);
|
|
#endif /* CIFS_DEBUG2 */
|
|
|
|
}
|
|
} /* end while !EXITING */
|
|
|
|
/* 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 */
|
|
/* Note that cifs_max_pending is normally 50, but
|
|
can be set at module install time to as little as two */
|
|
spin_lock(&GlobalMid_Lock);
|
|
if (atomic_read(&server->inFlight) >= cifs_max_pending)
|
|
atomic_set(&server->inFlight, cifs_max_pending - 1);
|
|
/* We do not want to set the max_pending too low or we
|
|
could end up with the counter going negative */
|
|
spin_unlock(&GlobalMid_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(csocket);
|
|
server->ssocket = NULL;
|
|
}
|
|
/* buffer usually freed in free_mid - need to free it here on exit */
|
|
cifs_buf_release(bigbuf);
|
|
if (smallbuf) /* no sense logging a debug message if NULL */
|
|
cifs_small_buf_release(smallbuf);
|
|
|
|
if (!list_empty(&server->pending_mid_q)) {
|
|
struct list_head dispose_list;
|
|
|
|
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%x", mid_entry->mid);
|
|
mid_entry->midState = 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%x", 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);
|
|
task_to_wake = xchg(&server->tsk, NULL);
|
|
kfree(server);
|
|
|
|
length = atomic_dec_return(&tcpSesAllocCount);
|
|
if (length > 0)
|
|
mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
|
|
GFP_KERNEL);
|
|
|
|
/* 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
|
|
cifs_parse_mount_options(const char *mountdata, const char *devname,
|
|
struct smb_vol *vol)
|
|
{
|
|
char *value, *data, *end;
|
|
char *mountdata_copy, *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;
|
|
char *nodename = utsname()->nodename;
|
|
|
|
separator[0] = ',';
|
|
separator[1] = 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;
|
|
|
|
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");
|
|
}
|
|
}
|
|
|
|
while ((data = strsep(&options, separator)) != NULL) {
|
|
if (!*data)
|
|
continue;
|
|
if ((value = strchr(data, '=')) != NULL)
|
|
*value++ = '\0';
|
|
|
|
/* Have to parse this before we parse for "user" */
|
|
if (strnicmp(data, "user_xattr", 10) == 0) {
|
|
vol->no_xattr = 0;
|
|
} else if (strnicmp(data, "nouser_xattr", 12) == 0) {
|
|
vol->no_xattr = 1;
|
|
} else if (strnicmp(data, "user", 4) == 0) {
|
|
if (!value) {
|
|
printk(KERN_WARNING
|
|
"CIFS: invalid or missing username\n");
|
|
goto cifs_parse_mount_err;
|
|
} else if (!*value) {
|
|
/* null user, ie anonymous, authentication */
|
|
vol->nullauth = 1;
|
|
}
|
|
if (strnlen(value, MAX_USERNAME_SIZE) <
|
|
MAX_USERNAME_SIZE) {
|
|
vol->username = kstrdup(value, GFP_KERNEL);
|
|
if (!vol->username) {
|
|
printk(KERN_WARNING "CIFS: no memory "
|
|
"for username\n");
|
|
goto cifs_parse_mount_err;
|
|
}
|
|
} else {
|
|
printk(KERN_WARNING "CIFS: username too long\n");
|
|
goto cifs_parse_mount_err;
|
|
}
|
|
} else if (strnicmp(data, "pass", 4) == 0) {
|
|
if (!value) {
|
|
vol->password = NULL;
|
|
continue;
|
|
} else if (value[0] == 0) {
|
|
/* check if string begins with double comma
|
|
since that would mean the password really
|
|
does start with a comma, and would not
|
|
indicate an empty string */
|
|
if (value[1] != separator[0]) {
|
|
vol->password = NULL;
|
|
continue;
|
|
}
|
|
}
|
|
temp_len = strlen(value);
|
|
/* removed password length check, NTLM passwords
|
|
can be arbitrarily long */
|
|
|
|
/* if comma in password, the string will be
|
|
prematurely null terminated. Commas in password are
|
|
specified across the cifs mount interface by a double
|
|
comma ie ,, and a comma used as in other cases ie ','
|
|
as a parameter delimiter/separator is single and due
|
|
to the strsep above is temporarily zeroed. */
|
|
|
|
/* NB: password legally can have multiple commas and
|
|
the only illegal character in a password is null */
|
|
|
|
if ((value[temp_len] == 0) &&
|
|
(value + temp_len < end) &&
|
|
(value[temp_len+1] == separator[0])) {
|
|
/* reinsert comma */
|
|
value[temp_len] = separator[0];
|
|
temp_len += 2; /* move after second comma */
|
|
while (value[temp_len] != 0) {
|
|
if (value[temp_len] == separator[0]) {
|
|
if (value[temp_len+1] ==
|
|
separator[0]) {
|
|
/* skip second comma */
|
|
temp_len++;
|
|
} else {
|
|
/* single comma indicating start
|
|
of next parm */
|
|
break;
|
|
}
|
|
}
|
|
temp_len++;
|
|
}
|
|
if (value[temp_len] == 0) {
|
|
options = NULL;
|
|
} else {
|
|
value[temp_len] = 0;
|
|
/* point option to start of next parm */
|
|
options = value + temp_len + 1;
|
|
}
|
|
/* go from value to value + temp_len condensing
|
|
double commas to singles. Note that this ends up
|
|
allocating a few bytes too many, which is ok */
|
|
vol->password = kzalloc(temp_len, 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] == separator[0]
|
|
&& value[i+1] == separator[0]) {
|
|
/* skip second comma */
|
|
i++;
|
|
}
|
|
}
|
|
vol->password[j] = 0;
|
|
} else {
|
|
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;
|
|
}
|
|
strcpy(vol->password, value);
|
|
}
|
|
} else if (!strnicmp(data, "ip", 2) ||
|
|
!strnicmp(data, "addr", 4)) {
|
|
if (!value || !*value) {
|
|
vol->UNCip = NULL;
|
|
} else if (strnlen(value, INET6_ADDRSTRLEN) <
|
|
INET6_ADDRSTRLEN) {
|
|
vol->UNCip = kstrdup(value, GFP_KERNEL);
|
|
if (!vol->UNCip) {
|
|
printk(KERN_WARNING "CIFS: no memory "
|
|
"for UNC IP\n");
|
|
goto cifs_parse_mount_err;
|
|
}
|
|
} else {
|
|
printk(KERN_WARNING "CIFS: ip address "
|
|
"too long\n");
|
|
goto cifs_parse_mount_err;
|
|
}
|
|
} else if (strnicmp(data, "sec", 3) == 0) {
|
|
if (!value || !*value) {
|
|
cERROR(1, "no security value specified");
|
|
continue;
|
|
} else if (strnicmp(value, "krb5i", 5) == 0) {
|
|
vol->secFlg |= CIFSSEC_MAY_KRB5 |
|
|
CIFSSEC_MUST_SIGN;
|
|
} else if (strnicmp(value, "krb5p", 5) == 0) {
|
|
/* vol->secFlg |= CIFSSEC_MUST_SEAL |
|
|
CIFSSEC_MAY_KRB5; */
|
|
cERROR(1, "Krb5 cifs privacy not supported");
|
|
goto cifs_parse_mount_err;
|
|
} else if (strnicmp(value, "krb5", 4) == 0) {
|
|
vol->secFlg |= CIFSSEC_MAY_KRB5;
|
|
} else if (strnicmp(value, "ntlmsspi", 8) == 0) {
|
|
vol->secFlg |= CIFSSEC_MAY_NTLMSSP |
|
|
CIFSSEC_MUST_SIGN;
|
|
} else if (strnicmp(value, "ntlmssp", 7) == 0) {
|
|
vol->secFlg |= CIFSSEC_MAY_NTLMSSP;
|
|
} else if (strnicmp(value, "ntlmv2i", 7) == 0) {
|
|
vol->secFlg |= CIFSSEC_MAY_NTLMV2 |
|
|
CIFSSEC_MUST_SIGN;
|
|
} else if (strnicmp(value, "ntlmv2", 6) == 0) {
|
|
vol->secFlg |= CIFSSEC_MAY_NTLMV2;
|
|
} else if (strnicmp(value, "ntlmi", 5) == 0) {
|
|
vol->secFlg |= CIFSSEC_MAY_NTLM |
|
|
CIFSSEC_MUST_SIGN;
|
|
} else if (strnicmp(value, "ntlm", 4) == 0) {
|
|
/* ntlm is default so can be turned off too */
|
|
vol->secFlg |= CIFSSEC_MAY_NTLM;
|
|
} else if (strnicmp(value, "nontlm", 6) == 0) {
|
|
/* BB is there a better way to do this? */
|
|
vol->secFlg |= CIFSSEC_MAY_NTLMV2;
|
|
#ifdef CONFIG_CIFS_WEAK_PW_HASH
|
|
} else if (strnicmp(value, "lanman", 6) == 0) {
|
|
vol->secFlg |= CIFSSEC_MAY_LANMAN;
|
|
#endif
|
|
} else if (strnicmp(value, "none", 4) == 0) {
|
|
vol->nullauth = 1;
|
|
} else {
|
|
cERROR(1, "bad security option: %s", value);
|
|
goto cifs_parse_mount_err;
|
|
}
|
|
} else if (strnicmp(data, "vers", 3) == 0) {
|
|
if (!value || !*value) {
|
|
cERROR(1, "no protocol version specified"
|
|
" after vers= mount option");
|
|
} else if ((strnicmp(value, "cifs", 4) == 0) ||
|
|
(strnicmp(value, "1", 1) == 0)) {
|
|
/* this is the default */
|
|
continue;
|
|
}
|
|
} else if ((strnicmp(data, "unc", 3) == 0)
|
|
|| (strnicmp(data, "target", 6) == 0)
|
|
|| (strnicmp(data, "path", 4) == 0)) {
|
|
if (!value || !*value) {
|
|
printk(KERN_WARNING "CIFS: invalid path to "
|
|
"network resource\n");
|
|
goto cifs_parse_mount_err;
|
|
}
|
|
if ((temp_len = strnlen(value, 300)) < 300) {
|
|
vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
|
|
if (vol->UNC == NULL)
|
|
goto cifs_parse_mount_err;
|
|
strcpy(vol->UNC, value);
|
|
if (strncmp(vol->UNC, "//", 2) == 0) {
|
|
vol->UNC[0] = '\\';
|
|
vol->UNC[1] = '\\';
|
|
} else if (strncmp(vol->UNC, "\\\\", 2) != 0) {
|
|
printk(KERN_WARNING
|
|
"CIFS: UNC Path does not begin "
|
|
"with // or \\\\ \n");
|
|
goto cifs_parse_mount_err;
|
|
}
|
|
} else {
|
|
printk(KERN_WARNING "CIFS: UNC name too long\n");
|
|
goto cifs_parse_mount_err;
|
|
}
|
|
} else if ((strnicmp(data, "domain", 3) == 0)
|
|
|| (strnicmp(data, "workgroup", 5) == 0)) {
|
|
if (!value || !*value) {
|
|
printk(KERN_WARNING "CIFS: invalid domain name\n");
|
|
goto cifs_parse_mount_err;
|
|
}
|
|
/* BB are there cases in which a comma can be valid in
|
|
a domain name and need special handling? */
|
|
if (strnlen(value, 256) < 256) {
|
|
vol->domainname = kstrdup(value, GFP_KERNEL);
|
|
if (!vol->domainname) {
|
|
printk(KERN_WARNING "CIFS: no memory "
|
|
"for domainname\n");
|
|
goto cifs_parse_mount_err;
|
|
}
|
|
cFYI(1, "Domain name set");
|
|
} else {
|
|
printk(KERN_WARNING "CIFS: domain name too "
|
|
"long\n");
|
|
goto cifs_parse_mount_err;
|
|
}
|
|
} else if (strnicmp(data, "srcaddr", 7) == 0) {
|
|
vol->srcaddr.ss_family = AF_UNSPEC;
|
|
|
|
if (!value || !*value) {
|
|
printk(KERN_WARNING "CIFS: srcaddr value"
|
|
" not specified.\n");
|
|
goto cifs_parse_mount_err;
|
|
}
|
|
i = cifs_convert_address((struct sockaddr *)&vol->srcaddr,
|
|
value, strlen(value));
|
|
if (i == 0) {
|
|
printk(KERN_WARNING "CIFS: Could not parse"
|
|
" srcaddr: %s\n",
|
|
value);
|
|
goto cifs_parse_mount_err;
|
|
}
|
|
} else if (strnicmp(data, "prefixpath", 10) == 0) {
|
|
if (!value || !*value) {
|
|
printk(KERN_WARNING
|
|
"CIFS: invalid path prefix\n");
|
|
goto cifs_parse_mount_err;
|
|
}
|
|
if ((temp_len = strnlen(value, 1024)) < 1024) {
|
|
if (value[0] != '/')
|
|
temp_len++; /* missing leading slash */
|
|
vol->prepath = kmalloc(temp_len+1, GFP_KERNEL);
|
|
if (vol->prepath == NULL)
|
|
goto cifs_parse_mount_err;
|
|
if (value[0] != '/') {
|
|
vol->prepath[0] = '/';
|
|
strcpy(vol->prepath+1, value);
|
|
} else
|
|
strcpy(vol->prepath, value);
|
|
cFYI(1, "prefix path %s", vol->prepath);
|
|
} else {
|
|
printk(KERN_WARNING "CIFS: prefix too long\n");
|
|
goto cifs_parse_mount_err;
|
|
}
|
|
} else if (strnicmp(data, "iocharset", 9) == 0) {
|
|
if (!value || !*value) {
|
|
printk(KERN_WARNING "CIFS: invalid iocharset "
|
|
"specified\n");
|
|
goto cifs_parse_mount_err;
|
|
}
|
|
if (strnlen(value, 65) < 65) {
|
|
if (strnicmp(value, "default", 7)) {
|
|
vol->iocharset = kstrdup(value,
|
|
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", value);
|
|
} else {
|
|
printk(KERN_WARNING "CIFS: iocharset name "
|
|
"too long.\n");
|
|
goto cifs_parse_mount_err;
|
|
}
|
|
} else if (!strnicmp(data, "uid", 3) && value && *value) {
|
|
vol->linux_uid = simple_strtoul(value, &value, 0);
|
|
uid_specified = true;
|
|
} else if (!strnicmp(data, "cruid", 5) && value && *value) {
|
|
vol->cred_uid = simple_strtoul(value, &value, 0);
|
|
} else if (!strnicmp(data, "forceuid", 8)) {
|
|
override_uid = 1;
|
|
} else if (!strnicmp(data, "noforceuid", 10)) {
|
|
override_uid = 0;
|
|
} else if (!strnicmp(data, "gid", 3) && value && *value) {
|
|
vol->linux_gid = simple_strtoul(value, &value, 0);
|
|
gid_specified = true;
|
|
} else if (!strnicmp(data, "forcegid", 8)) {
|
|
override_gid = 1;
|
|
} else if (!strnicmp(data, "noforcegid", 10)) {
|
|
override_gid = 0;
|
|
} else if (strnicmp(data, "file_mode", 4) == 0) {
|
|
if (value && *value) {
|
|
vol->file_mode =
|
|
simple_strtoul(value, &value, 0);
|
|
}
|
|
} else if (strnicmp(data, "dir_mode", 4) == 0) {
|
|
if (value && *value) {
|
|
vol->dir_mode =
|
|
simple_strtoul(value, &value, 0);
|
|
}
|
|
} else if (strnicmp(data, "dirmode", 4) == 0) {
|
|
if (value && *value) {
|
|
vol->dir_mode =
|
|
simple_strtoul(value, &value, 0);
|
|
}
|
|
} else if (strnicmp(data, "port", 4) == 0) {
|
|
if (value && *value) {
|
|
vol->port =
|
|
simple_strtoul(value, &value, 0);
|
|
}
|
|
} else if (strnicmp(data, "rsize", 5) == 0) {
|
|
if (value && *value) {
|
|
vol->rsize =
|
|
simple_strtoul(value, &value, 0);
|
|
}
|
|
} else if (strnicmp(data, "wsize", 5) == 0) {
|
|
if (value && *value) {
|
|
vol->wsize =
|
|
simple_strtoul(value, &value, 0);
|
|
}
|
|
} else if (strnicmp(data, "sockopt", 5) == 0) {
|
|
if (!value || !*value) {
|
|
cERROR(1, "no socket option specified");
|
|
continue;
|
|
} else if (strnicmp(value, "TCP_NODELAY", 11) == 0) {
|
|
vol->sockopt_tcp_nodelay = 1;
|
|
}
|
|
} else if (strnicmp(data, "netbiosname", 4) == 0) {
|
|
if (!value || !*value || (*value == ' ')) {
|
|
cFYI(1, "invalid (empty) netbiosname");
|
|
} else {
|
|
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 (value[i] == 0)
|
|
break;
|
|
vol->source_rfc1001_name[i] = value[i];
|
|
}
|
|
/* The string has 16th byte zero still from
|
|
set at top of the function */
|
|
if (i == RFC1001_NAME_LEN && value[i] != 0)
|
|
printk(KERN_WARNING "CIFS: netbiosname"
|
|
" longer than 15 truncated.\n");
|
|
}
|
|
} else if (strnicmp(data, "servern", 7) == 0) {
|
|
/* servernetbiosname specified override *SMBSERVER */
|
|
if (!value || !*value || (*value == ' ')) {
|
|
cFYI(1, "empty server netbiosname specified");
|
|
} else {
|
|
/* last byte, type, is 0x20 for servr type */
|
|
memset(vol->target_rfc1001_name, 0x20,
|
|
RFC1001_NAME_LEN_WITH_NULL);
|
|
|
|
for (i = 0; i < 15; i++) {
|
|
/* 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 netbiosname */
|
|
if (value[i] == 0)
|
|
break;
|
|
else
|
|
vol->target_rfc1001_name[i] =
|
|
value[i];
|
|
}
|
|
/* The string has 16th byte zero still from
|
|
set at top of the function */
|
|
if (i == RFC1001_NAME_LEN && value[i] != 0)
|
|
printk(KERN_WARNING "CIFS: server net"
|
|
"biosname longer than 15 truncated.\n");
|
|
}
|
|
} else if (strnicmp(data, "actimeo", 7) == 0) {
|
|
if (value && *value) {
|
|
vol->actimeo = HZ * simple_strtoul(value,
|
|
&value, 0);
|
|
if (vol->actimeo > CIFS_MAX_ACTIMEO) {
|
|
cERROR(1, "CIFS: attribute cache"
|
|
"timeout too large");
|
|
goto cifs_parse_mount_err;
|
|
}
|
|
}
|
|
} else if (strnicmp(data, "credentials", 4) == 0) {
|
|
/* ignore */
|
|
} else if (strnicmp(data, "version", 3) == 0) {
|
|
/* ignore */
|
|
} else if (strnicmp(data, "guest", 5) == 0) {
|
|
/* ignore */
|
|
} else if (strnicmp(data, "rw", 2) == 0) {
|
|
/* ignore */
|
|
} else if (strnicmp(data, "ro", 2) == 0) {
|
|
/* ignore */
|
|
} else if (strnicmp(data, "noblocksend", 11) == 0) {
|
|
vol->noblocksnd = 1;
|
|
} else if (strnicmp(data, "noautotune", 10) == 0) {
|
|
vol->noautotune = 1;
|
|
} else if ((strnicmp(data, "suid", 4) == 0) ||
|
|
(strnicmp(data, "nosuid", 6) == 0) ||
|
|
(strnicmp(data, "exec", 4) == 0) ||
|
|
(strnicmp(data, "noexec", 6) == 0) ||
|
|
(strnicmp(data, "nodev", 5) == 0) ||
|
|
(strnicmp(data, "noauto", 6) == 0) ||
|
|
(strnicmp(data, "dev", 3) == 0)) {
|
|
/* The mount tool or mount.cifs helper (if present)
|
|
uses these opts to set flags, and the flags are read
|
|
by the kernel vfs layer before we get here (ie
|
|
before read super) so there is no point trying to
|
|
parse these options again and set anything and it
|
|
is ok to just ignore them */
|
|
continue;
|
|
} else if (strnicmp(data, "hard", 4) == 0) {
|
|
vol->retry = 1;
|
|
} else if (strnicmp(data, "soft", 4) == 0) {
|
|
vol->retry = 0;
|
|
} else if (strnicmp(data, "perm", 4) == 0) {
|
|
vol->noperm = 0;
|
|
} else if (strnicmp(data, "noperm", 6) == 0) {
|
|
vol->noperm = 1;
|
|
} else if (strnicmp(data, "mapchars", 8) == 0) {
|
|
vol->remap = 1;
|
|
} else if (strnicmp(data, "nomapchars", 10) == 0) {
|
|
vol->remap = 0;
|
|
} else if (strnicmp(data, "sfu", 3) == 0) {
|
|
vol->sfu_emul = 1;
|
|
} else if (strnicmp(data, "nosfu", 5) == 0) {
|
|
vol->sfu_emul = 0;
|
|
} else if (strnicmp(data, "nodfs", 5) == 0) {
|
|
vol->nodfs = 1;
|
|
} else if (strnicmp(data, "posixpaths", 10) == 0) {
|
|
vol->posix_paths = 1;
|
|
} else if (strnicmp(data, "noposixpaths", 12) == 0) {
|
|
vol->posix_paths = 0;
|
|
} else if (strnicmp(data, "nounix", 6) == 0) {
|
|
vol->no_linux_ext = 1;
|
|
} else if (strnicmp(data, "nolinux", 7) == 0) {
|
|
vol->no_linux_ext = 1;
|
|
} else if ((strnicmp(data, "nocase", 6) == 0) ||
|
|
(strnicmp(data, "ignorecase", 10) == 0)) {
|
|
vol->nocase = 1;
|
|
} else if (strnicmp(data, "mand", 4) == 0) {
|
|
/* ignore */
|
|
} else if (strnicmp(data, "nomand", 6) == 0) {
|
|
/* ignore */
|
|
} else if (strnicmp(data, "_netdev", 7) == 0) {
|
|
/* ignore */
|
|
} else if (strnicmp(data, "brl", 3) == 0) {
|
|
vol->nobrl = 0;
|
|
} else if ((strnicmp(data, "nobrl", 5) == 0) ||
|
|
(strnicmp(data, "nolock", 6) == 0)) {
|
|
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;
|
|
} else if (strnicmp(data, "forcemandatorylock", 9) == 0) {
|
|
/* will take the shorter form "forcemand" as well */
|
|
/* This mount option will force use of mandatory
|
|
(DOS/Windows style) byte range locks, instead of
|
|
using posix advisory byte range locks, even if the
|
|
Unix extensions are available and posix locks would
|
|
be supported otherwise. If Unix extensions are not
|
|
negotiated this has no effect since mandatory locks
|
|
would be used (mandatory locks is all that those
|
|
those servers support) */
|
|
vol->mand_lock = 1;
|
|
} else if (strnicmp(data, "setuids", 7) == 0) {
|
|
vol->setuids = 1;
|
|
} else if (strnicmp(data, "nosetuids", 9) == 0) {
|
|
vol->setuids = 0;
|
|
} else if (strnicmp(data, "dynperm", 7) == 0) {
|
|
vol->dynperm = true;
|
|
} else if (strnicmp(data, "nodynperm", 9) == 0) {
|
|
vol->dynperm = false;
|
|
} else if (strnicmp(data, "nohard", 6) == 0) {
|
|
vol->retry = 0;
|
|
} else if (strnicmp(data, "nosoft", 6) == 0) {
|
|
vol->retry = 1;
|
|
} else if (strnicmp(data, "nointr", 6) == 0) {
|
|
vol->intr = 0;
|
|
} else if (strnicmp(data, "intr", 4) == 0) {
|
|
vol->intr = 1;
|
|
} else if (strnicmp(data, "nostrictsync", 12) == 0) {
|
|
vol->nostrictsync = 1;
|
|
} else if (strnicmp(data, "strictsync", 10) == 0) {
|
|
vol->nostrictsync = 0;
|
|
} else if (strnicmp(data, "serverino", 7) == 0) {
|
|
vol->server_ino = 1;
|
|
} else if (strnicmp(data, "noserverino", 9) == 0) {
|
|
vol->server_ino = 0;
|
|
} else if (strnicmp(data, "rwpidforward", 4) == 0) {
|
|
vol->rwpidforward = 1;
|
|
} else if (strnicmp(data, "cifsacl", 7) == 0) {
|
|
vol->cifs_acl = 1;
|
|
} else if (strnicmp(data, "nocifsacl", 9) == 0) {
|
|
vol->cifs_acl = 0;
|
|
} else if (strnicmp(data, "acl", 3) == 0) {
|
|
vol->no_psx_acl = 0;
|
|
} else if (strnicmp(data, "noacl", 5) == 0) {
|
|
vol->no_psx_acl = 1;
|
|
} else if (strnicmp(data, "locallease", 6) == 0) {
|
|
vol->local_lease = 1;
|
|
} else if (strnicmp(data, "sign", 4) == 0) {
|
|
vol->secFlg |= CIFSSEC_MUST_SIGN;
|
|
} else if (strnicmp(data, "seal", 4) == 0) {
|
|
/* 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;
|
|
} else if (strnicmp(data, "direct", 6) == 0) {
|
|
vol->direct_io = 1;
|
|
} else if (strnicmp(data, "forcedirectio", 13) == 0) {
|
|
vol->direct_io = 1;
|
|
} else if (strnicmp(data, "strictcache", 11) == 0) {
|
|
vol->strict_io = 1;
|
|
} else if (strnicmp(data, "noac", 4) == 0) {
|
|
printk(KERN_WARNING "CIFS: Mount option noac not "
|
|
"supported. Instead set "
|
|
"/proc/fs/cifs/LookupCacheEnabled to 0\n");
|
|
} else if (strnicmp(data, "fsc", 3) == 0) {
|
|
#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;
|
|
} else if (strnicmp(data, "mfsymlinks", 10) == 0) {
|
|
vol->mfsymlinks = true;
|
|
} else if (strnicmp(data, "multiuser", 8) == 0) {
|
|
vol->multiuser = true;
|
|
} else
|
|
printk(KERN_WARNING "CIFS: Unknown mount option %s\n",
|
|
data);
|
|
}
|
|
if (vol->UNC == NULL) {
|
|
if (devname == NULL) {
|
|
printk(KERN_WARNING "CIFS: Missing UNC name for mount "
|
|
"target\n");
|
|
goto cifs_parse_mount_err;
|
|
}
|
|
if ((temp_len = strnlen(devname, 300)) < 300) {
|
|
vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
|
|
if (vol->UNC == NULL)
|
|
goto cifs_parse_mount_err;
|
|
strcpy(vol->UNC, devname);
|
|
if (strncmp(vol->UNC, "//", 2) == 0) {
|
|
vol->UNC[0] = '\\';
|
|
vol->UNC[1] = '\\';
|
|
} else if (strncmp(vol->UNC, "\\\\", 2) != 0) {
|
|
printk(KERN_WARNING "CIFS: UNC Path does not "
|
|
"begin with // or \\\\ \n");
|
|
goto cifs_parse_mount_err;
|
|
}
|
|
value = strpbrk(vol->UNC+2, "/\\");
|
|
if (value)
|
|
*value = '\\';
|
|
} else {
|
|
printk(KERN_WARNING "CIFS: UNC name too long\n");
|
|
goto cifs_parse_mount_err;
|
|
}
|
|
}
|
|
|
|
if (vol->multiuser && !(vol->secFlg & CIFSSEC_MAY_KRB5)) {
|
|
cERROR(1, "Multiuser mounts currently require krb5 "
|
|
"authentication!");
|
|
goto cifs_parse_mount_err;
|
|
}
|
|
|
|
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");
|
|
|
|
kfree(mountdata_copy);
|
|
return 0;
|
|
|
|
cifs_parse_mount_err:
|
|
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 (!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;
|
|
}
|
|
|
|
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;
|
|
atomic_set(&tcp_ses->inFlight, 0);
|
|
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;
|
|
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((void *)(void *)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(system_nrt_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:
|
|
/* anything else takes username/password */
|
|
if (ses->user_name == NULL)
|
|
return 0;
|
|
if (strncmp(ses->user_name, 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);
|
|
}
|
|
|
|
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 3.1");
|
|
}
|
|
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);
|
|
|
|
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;
|
|
|
|
if (old->rsize != new->rsize)
|
|
return 0;
|
|
|
|
/*
|
|
* We want to share sb only if we don't specify wsize or specified wsize
|
|
* is greater or equal than existing one.
|
|
*/
|
|
if (new->wsize && new->wsize < old->wsize)
|
|
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:
|
|
cifs_put_tlink(tlink);
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
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;
|
|
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
|
|
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 super_block *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 (sb)
|
|
sb->s_flags |= MS_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 (sb)
|
|
CIFS_SB(sb)->mnt_cifs_flags |=
|
|
CIFS_MOUNT_POSIX_PATHS;
|
|
}
|
|
|
|
if (sb && (CIFS_SB(sb)->rsize > 127 * 1024)) {
|
|
if ((cap & CIFS_UNIX_LARGE_READ_CAP) == 0) {
|
|
CIFS_SB(sb)->rsize = 127 * 1024;
|
|
cFYI(DBG2, "larger reads not supported by srv");
|
|
}
|
|
}
|
|
|
|
|
|
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);
|
|
|
|
if (pvolume_info->rsize > CIFSMaxBufSize) {
|
|
cERROR(1, "rsize %d too large, using MaxBufSize",
|
|
pvolume_info->rsize);
|
|
cifs_sb->rsize = CIFSMaxBufSize;
|
|
} else if ((pvolume_info->rsize) &&
|
|
(pvolume_info->rsize <= CIFSMaxBufSize))
|
|
cifs_sb->rsize = pvolume_info->rsize;
|
|
else /* default */
|
|
cifs_sb->rsize = CIFSMaxBufSize;
|
|
|
|
if (cifs_sb->rsize < 2048) {
|
|
cifs_sb->rsize = 2048;
|
|
/* Windows ME may prefer this */
|
|
cFYI(1, "readsize set to minimum: 2048");
|
|
}
|
|
|
|
/*
|
|
* Temporarily set wsize for matching superblock. If we end up using
|
|
* new sb then cifs_negotiate_wsize will later negotiate it downward
|
|
* if needed.
|
|
*/
|
|
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%x dir mode: 0x%x",
|
|
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->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 writes via POSIX extensions, we can
|
|
* allow up to 2^24 - PAGE_CACHE_SIZE.
|
|
*
|
|
* 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.
|
|
*/
|
|
#define CIFS_MAX_WSIZE ((1<<24) - PAGE_CACHE_SIZE)
|
|
|
|
/*
|
|
* When the server doesn't allow large posix writes, default to a wsize of
|
|
* 128k - PAGE_CACHE_SIZE -- one page less than the largest frame size
|
|
* described in RFC1001. This allows space for the header without going over
|
|
* that by default.
|
|
*/
|
|
#define CIFS_MAX_RFC1001_WSIZE (128 * 1024 - PAGE_CACHE_SIZE)
|
|
|
|
/*
|
|
* 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_WSIZE (1024 * 1024)
|
|
|
|
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 = pvolume_info->wsize ? pvolume_info->wsize :
|
|
CIFS_DEFAULT_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_RFC1001_WSIZE);
|
|
|
|
/* no CAP_LARGE_WRITE_X? Limit it to 16 bits */
|
|
if (!(server->capabilities & CAP_LARGE_WRITE_X))
|
|
wsize = min_t(unsigned int, wsize, USHRT_MAX);
|
|
|
|
/* hard limit of CIFS_MAX_WSIZE */
|
|
wsize = min_t(unsigned int, wsize, CIFS_MAX_WSIZE);
|
|
|
|
return wsize;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
void
|
|
cifs_cleanup_volume_info(struct smb_vol **pvolume_info)
|
|
{
|
|
struct smb_vol *volume_info;
|
|
|
|
if (!pvolume_info || !*pvolume_info)
|
|
return;
|
|
|
|
volume_info = *pvolume_info;
|
|
kfree(volume_info->username);
|
|
kzfree(volume_info->password);
|
|
kfree(volume_info->UNC);
|
|
kfree(volume_info->UNCip);
|
|
kfree(volume_info->domainname);
|
|
kfree(volume_info->iocharset);
|
|
kfree(volume_info->prepath);
|
|
kfree(volume_info);
|
|
*pvolume_info = NULL;
|
|
return;
|
|
}
|
|
|
|
#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 *volume_info,
|
|
const struct cifs_sb_info *cifs_sb)
|
|
{
|
|
char *full_path;
|
|
|
|
int unc_len = strnlen(volume_info->UNC, MAX_TREE_SIZE + 1);
|
|
full_path = kmalloc(unc_len + 1, GFP_KERNEL);
|
|
if (full_path == NULL)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
strncpy(full_path, volume_info->UNC, unc_len);
|
|
full_path[unc_len] = 0; /* add trailing null */
|
|
convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
|
|
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);
|
|
kfree(fake_devname);
|
|
|
|
if (cifs_sb->mountdata != NULL)
|
|
kfree(cifs_sb->mountdata);
|
|
|
|
if (IS_ERR(mdata)) {
|
|
rc = PTR_ERR(mdata);
|
|
mdata = NULL;
|
|
}
|
|
cifs_sb->mountdata = mdata;
|
|
}
|
|
kfree(full_path);
|
|
return rc;
|
|
}
|
|
#endif
|
|
|
|
int cifs_setup_volume_info(struct smb_vol **pvolume_info, char *mount_data,
|
|
const char *devname)
|
|
{
|
|
struct smb_vol *volume_info;
|
|
int rc = 0;
|
|
|
|
*pvolume_info = NULL;
|
|
|
|
volume_info = kzalloc(sizeof(struct smb_vol), GFP_KERNEL);
|
|
if (!volume_info) {
|
|
rc = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
if (cifs_parse_mount_options(mount_data, devname,
|
|
volume_info)) {
|
|
rc = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
if (volume_info->nullauth) {
|
|
cFYI(1, "null user");
|
|
volume_info->username = "";
|
|
} 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 */
|
|
rc = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
/* 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);
|
|
rc = -ELIBACC;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
*pvolume_info = volume_info;
|
|
return rc;
|
|
out:
|
|
cifs_cleanup_volume_info(&volume_info);
|
|
return rc;
|
|
}
|
|
|
|
int
|
|
cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
|
|
struct smb_vol *volume_info, const char *devname)
|
|
{
|
|
int rc = 0;
|
|
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;
|
|
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);
|
|
|
|
cifs_cleanup_volume_info(&volume_info);
|
|
FreeXid(xid);
|
|
}
|
|
#endif
|
|
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);
|
|
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;
|
|
}
|
|
|
|
if (pSesInfo->capabilities & CAP_LARGE_FILES)
|
|
sb->s_maxbytes = MAX_LFS_FILESIZE;
|
|
else
|
|
sb->s_maxbytes = MAX_NON_LFS;
|
|
|
|
/* BB FIXME fix time_gran to be larger for LANMAN sessions */
|
|
sb->s_time_gran = 100;
|
|
|
|
/* 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, 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);
|
|
}
|
|
|
|
if ((tcon->unix_ext == 0) && (cifs_sb->rsize > (1024 * 127))) {
|
|
cifs_sb->rsize = 1024 * 127;
|
|
cFYI(DBG2, "no very large read support, rsize now 127K");
|
|
}
|
|
if (!(tcon->ses->capabilities & CAP_LARGE_READ_X))
|
|
cifs_sb->rsize = min(cifs_sb->rsize,
|
|
(tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE));
|
|
|
|
cifs_sb->wsize = cifs_negotiate_wsize(tcon, volume_info);
|
|
|
|
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(system_nrt_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);
|
|
goto out;
|
|
}
|
|
|
|
/* volume_info->password is freed above when existing session found
|
|
(in which case it is not needed anymore) but when new sesion is created
|
|
the password ptr is put in the new session structure (in which case the
|
|
password will be freed at unmount time) */
|
|
out:
|
|
/* zero out password before freeing */
|
|
FreeXid(xid);
|
|
return rc;
|
|
}
|
|
|
|
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 = GetNextMid(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 ((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);
|
|
|
|
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_strtoUCS((__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_ucs(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;
|
|
}
|
|
|
|
int
|
|
cifs_umount(struct super_block *sb, 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);
|
|
|
|
return 0;
|
|
}
|
|
|
|
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;
|
|
|
|
rc = CIFSSMBNegotiate(xid, ses);
|
|
if (rc == -EAGAIN) {
|
|
/* retry only once on 1st time connection */
|
|
rc = CIFSSMBNegotiate(xid, ses);
|
|
if (rc == -EAGAIN)
|
|
rc = -EHOSTDOWN;
|
|
}
|
|
if (rc == 0) {
|
|
spin_lock(&GlobalMid_Lock);
|
|
if (server->tcpStatus != CifsExiting)
|
|
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 struct cifs_tcon *
|
|
cifs_construct_tcon(struct cifs_sb_info *cifs_sb, uid_t fsuid)
|
|
{
|
|
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;
|
|
char username[28]; /* big enough for "krb50x" + hex of ULONG_MAX 6+16 */
|
|
/* We used to have this as MAX_USERNAME which is */
|
|
/* way too big now (256 instead of 32) */
|
|
|
|
vol_info = kzalloc(sizeof(*vol_info), GFP_KERNEL);
|
|
if (vol_info == NULL) {
|
|
tcon = ERR_PTR(-ENOMEM);
|
|
goto out;
|
|
}
|
|
|
|
snprintf(username, MAX_USERNAME_SIZE, "krb50x%x", fsuid);
|
|
vol_info->username = username;
|
|
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;
|
|
|
|
/* FIXME: allow for other secFlg settings */
|
|
vol_info->secFlg = CIFSSEC_MUST_KRB5;
|
|
|
|
/* 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);
|
|
|
|
return tcon;
|
|
}
|
|
|
|
static inline struct tcon_link *
|
|
cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb)
|
|
{
|
|
return cifs_sb->master_tlink;
|
|
}
|
|
|
|
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(system_nrt_wq, &cifs_sb->prune_tlinks,
|
|
TLINK_IDLE_EXPIRE);
|
|
}
|