5e500ed125
We've now warned about this for two releases. Remove it for 3.5. Signed-off-by: Jeff Layton <jlayton@redhat.com>
675 lines
19 KiB
C
675 lines
19 KiB
C
/*
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* fs/cifs/misc.c
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*
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* Copyright (C) International Business Machines Corp., 2002,2008
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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/slab.h>
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#include <linux/ctype.h>
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#include <linux/mempool.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_debug.h"
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#include "smberr.h"
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#include "nterr.h"
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#include "cifs_unicode.h"
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extern mempool_t *cifs_sm_req_poolp;
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extern mempool_t *cifs_req_poolp;
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/* The xid serves as a useful identifier for each incoming vfs request,
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in a similar way to the mid which is useful to track each sent smb,
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and CurrentXid can also provide a running counter (although it
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will eventually wrap past zero) of the total vfs operations handled
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since the cifs fs was mounted */
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unsigned int
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_GetXid(void)
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{
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unsigned int xid;
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spin_lock(&GlobalMid_Lock);
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GlobalTotalActiveXid++;
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/* keep high water mark for number of simultaneous ops in filesystem */
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if (GlobalTotalActiveXid > GlobalMaxActiveXid)
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GlobalMaxActiveXid = GlobalTotalActiveXid;
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if (GlobalTotalActiveXid > 65000)
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cFYI(1, "warning: more than 65000 requests active");
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xid = GlobalCurrentXid++;
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spin_unlock(&GlobalMid_Lock);
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return xid;
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}
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void
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_FreeXid(unsigned int xid)
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{
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spin_lock(&GlobalMid_Lock);
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/* if (GlobalTotalActiveXid == 0)
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BUG(); */
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GlobalTotalActiveXid--;
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spin_unlock(&GlobalMid_Lock);
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}
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struct cifs_ses *
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sesInfoAlloc(void)
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{
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struct cifs_ses *ret_buf;
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ret_buf = kzalloc(sizeof(struct cifs_ses), GFP_KERNEL);
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if (ret_buf) {
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atomic_inc(&sesInfoAllocCount);
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ret_buf->status = CifsNew;
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++ret_buf->ses_count;
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INIT_LIST_HEAD(&ret_buf->smb_ses_list);
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INIT_LIST_HEAD(&ret_buf->tcon_list);
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mutex_init(&ret_buf->session_mutex);
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}
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return ret_buf;
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}
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void
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sesInfoFree(struct cifs_ses *buf_to_free)
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{
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if (buf_to_free == NULL) {
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cFYI(1, "Null buffer passed to sesInfoFree");
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return;
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}
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atomic_dec(&sesInfoAllocCount);
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kfree(buf_to_free->serverOS);
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kfree(buf_to_free->serverDomain);
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kfree(buf_to_free->serverNOS);
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if (buf_to_free->password) {
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memset(buf_to_free->password, 0, strlen(buf_to_free->password));
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kfree(buf_to_free->password);
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}
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kfree(buf_to_free->user_name);
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kfree(buf_to_free->domainName);
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kfree(buf_to_free);
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}
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struct cifs_tcon *
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tconInfoAlloc(void)
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{
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struct cifs_tcon *ret_buf;
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ret_buf = kzalloc(sizeof(struct cifs_tcon), GFP_KERNEL);
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if (ret_buf) {
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atomic_inc(&tconInfoAllocCount);
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ret_buf->tidStatus = CifsNew;
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++ret_buf->tc_count;
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INIT_LIST_HEAD(&ret_buf->openFileList);
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INIT_LIST_HEAD(&ret_buf->tcon_list);
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#ifdef CONFIG_CIFS_STATS
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spin_lock_init(&ret_buf->stat_lock);
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#endif
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}
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return ret_buf;
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}
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void
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tconInfoFree(struct cifs_tcon *buf_to_free)
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{
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if (buf_to_free == NULL) {
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cFYI(1, "Null buffer passed to tconInfoFree");
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return;
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}
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atomic_dec(&tconInfoAllocCount);
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kfree(buf_to_free->nativeFileSystem);
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if (buf_to_free->password) {
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memset(buf_to_free->password, 0, strlen(buf_to_free->password));
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kfree(buf_to_free->password);
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}
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kfree(buf_to_free);
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}
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struct smb_hdr *
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cifs_buf_get(void)
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{
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struct smb_hdr *ret_buf = NULL;
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/* We could use negotiated size instead of max_msgsize -
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but it may be more efficient to always alloc same size
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albeit slightly larger than necessary and maxbuffersize
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defaults to this and can not be bigger */
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ret_buf = mempool_alloc(cifs_req_poolp, GFP_NOFS);
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/* clear the first few header bytes */
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/* for most paths, more is cleared in header_assemble */
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if (ret_buf) {
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memset(ret_buf, 0, sizeof(struct smb_hdr) + 3);
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atomic_inc(&bufAllocCount);
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#ifdef CONFIG_CIFS_STATS2
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atomic_inc(&totBufAllocCount);
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#endif /* CONFIG_CIFS_STATS2 */
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}
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return ret_buf;
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}
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void
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cifs_buf_release(void *buf_to_free)
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{
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if (buf_to_free == NULL) {
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/* cFYI(1, "Null buffer passed to cifs_buf_release");*/
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return;
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}
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mempool_free(buf_to_free, cifs_req_poolp);
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atomic_dec(&bufAllocCount);
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return;
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}
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struct smb_hdr *
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cifs_small_buf_get(void)
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{
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struct smb_hdr *ret_buf = NULL;
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/* We could use negotiated size instead of max_msgsize -
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but it may be more efficient to always alloc same size
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albeit slightly larger than necessary and maxbuffersize
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defaults to this and can not be bigger */
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ret_buf = mempool_alloc(cifs_sm_req_poolp, GFP_NOFS);
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if (ret_buf) {
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/* No need to clear memory here, cleared in header assemble */
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/* memset(ret_buf, 0, sizeof(struct smb_hdr) + 27);*/
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atomic_inc(&smBufAllocCount);
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#ifdef CONFIG_CIFS_STATS2
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atomic_inc(&totSmBufAllocCount);
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#endif /* CONFIG_CIFS_STATS2 */
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}
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return ret_buf;
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}
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void
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cifs_small_buf_release(void *buf_to_free)
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{
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if (buf_to_free == NULL) {
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cFYI(1, "Null buffer passed to cifs_small_buf_release");
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return;
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}
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mempool_free(buf_to_free, cifs_sm_req_poolp);
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atomic_dec(&smBufAllocCount);
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return;
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}
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/*
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* Find a free multiplex id (SMB mid). Otherwise there could be
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* mid collisions which might cause problems, demultiplexing the
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* wrong response to this request. Multiplex ids could collide if
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* one of a series requests takes much longer than the others, or
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* if a very large number of long lived requests (byte range
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* locks or FindNotify requests) are pending. No more than
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* 64K-1 requests can be outstanding at one time. If no
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* mids are available, return zero. A future optimization
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* could make the combination of mids and uid the key we use
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* to demultiplex on (rather than mid alone).
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* In addition to the above check, the cifs demultiplex
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* code already used the command code as a secondary
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* check of the frame and if signing is negotiated the
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* response would be discarded if the mid were the same
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* but the signature was wrong. Since the mid is not put in the
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* pending queue until later (when it is about to be dispatched)
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* we do have to limit the number of outstanding requests
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* to somewhat less than 64K-1 although it is hard to imagine
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* so many threads being in the vfs at one time.
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*/
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__u64 GetNextMid(struct TCP_Server_Info *server)
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{
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__u64 mid = 0;
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__u16 last_mid, cur_mid;
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bool collision;
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spin_lock(&GlobalMid_Lock);
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/* mid is 16 bit only for CIFS/SMB */
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cur_mid = (__u16)((server->CurrentMid) & 0xffff);
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/* we do not want to loop forever */
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last_mid = cur_mid;
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cur_mid++;
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/*
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* This nested loop looks more expensive than it is.
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* In practice the list of pending requests is short,
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* fewer than 50, and the mids are likely to be unique
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* on the first pass through the loop unless some request
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* takes longer than the 64 thousand requests before it
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* (and it would also have to have been a request that
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* did not time out).
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*/
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while (cur_mid != last_mid) {
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struct mid_q_entry *mid_entry;
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unsigned int num_mids;
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collision = false;
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if (cur_mid == 0)
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cur_mid++;
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num_mids = 0;
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list_for_each_entry(mid_entry, &server->pending_mid_q, qhead) {
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++num_mids;
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if (mid_entry->mid == cur_mid &&
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mid_entry->mid_state == MID_REQUEST_SUBMITTED) {
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/* This mid is in use, try a different one */
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collision = true;
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break;
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}
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}
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/*
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* if we have more than 32k mids in the list, then something
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* is very wrong. Possibly a local user is trying to DoS the
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* box by issuing long-running calls and SIGKILL'ing them. If
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* we get to 2^16 mids then we're in big trouble as this
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* function could loop forever.
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*
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* Go ahead and assign out the mid in this situation, but force
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* an eventual reconnect to clean out the pending_mid_q.
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*/
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if (num_mids > 32768)
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server->tcpStatus = CifsNeedReconnect;
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if (!collision) {
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mid = (__u64)cur_mid;
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server->CurrentMid = mid;
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break;
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}
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cur_mid++;
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}
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spin_unlock(&GlobalMid_Lock);
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return mid;
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}
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/* NB: MID can not be set if treeCon not passed in, in that
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case it is responsbility of caller to set the mid */
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void
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header_assemble(struct smb_hdr *buffer, char smb_command /* command */ ,
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const struct cifs_tcon *treeCon, int word_count
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/* length of fixed section (word count) in two byte units */)
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{
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char *temp = (char *) buffer;
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memset(temp, 0, 256); /* bigger than MAX_CIFS_HDR_SIZE */
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buffer->smb_buf_length = cpu_to_be32(
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(2 * word_count) + sizeof(struct smb_hdr) -
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4 /* RFC 1001 length field does not count */ +
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2 /* for bcc field itself */) ;
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buffer->Protocol[0] = 0xFF;
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buffer->Protocol[1] = 'S';
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buffer->Protocol[2] = 'M';
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buffer->Protocol[3] = 'B';
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buffer->Command = smb_command;
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buffer->Flags = 0x00; /* case sensitive */
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buffer->Flags2 = SMBFLG2_KNOWS_LONG_NAMES;
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buffer->Pid = cpu_to_le16((__u16)current->tgid);
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buffer->PidHigh = cpu_to_le16((__u16)(current->tgid >> 16));
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if (treeCon) {
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buffer->Tid = treeCon->tid;
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if (treeCon->ses) {
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if (treeCon->ses->capabilities & CAP_UNICODE)
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buffer->Flags2 |= SMBFLG2_UNICODE;
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if (treeCon->ses->capabilities & CAP_STATUS32)
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buffer->Flags2 |= SMBFLG2_ERR_STATUS;
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/* Uid is not converted */
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buffer->Uid = treeCon->ses->Suid;
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buffer->Mid = GetNextMid(treeCon->ses->server);
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}
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if (treeCon->Flags & SMB_SHARE_IS_IN_DFS)
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buffer->Flags2 |= SMBFLG2_DFS;
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if (treeCon->nocase)
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buffer->Flags |= SMBFLG_CASELESS;
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if ((treeCon->ses) && (treeCon->ses->server))
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if (treeCon->ses->server->sec_mode &
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(SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
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buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
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}
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/* endian conversion of flags is now done just before sending */
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buffer->WordCount = (char) word_count;
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return;
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}
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static int
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check_smb_hdr(struct smb_hdr *smb, __u16 mid)
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{
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/* does it have the right SMB "signature" ? */
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if (*(__le32 *) smb->Protocol != cpu_to_le32(0x424d53ff)) {
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cERROR(1, "Bad protocol string signature header 0x%x",
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*(unsigned int *)smb->Protocol);
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return 1;
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}
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/* Make sure that message ids match */
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if (mid != smb->Mid) {
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cERROR(1, "Mids do not match. received=%u expected=%u",
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smb->Mid, mid);
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return 1;
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}
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/* if it's a response then accept */
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if (smb->Flags & SMBFLG_RESPONSE)
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return 0;
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/* only one valid case where server sends us request */
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if (smb->Command == SMB_COM_LOCKING_ANDX)
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return 0;
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cERROR(1, "Server sent request, not response. mid=%u", smb->Mid);
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return 1;
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}
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int
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checkSMB(char *buf, unsigned int total_read)
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{
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struct smb_hdr *smb = (struct smb_hdr *)buf;
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__u16 mid = smb->Mid;
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__u32 rfclen = be32_to_cpu(smb->smb_buf_length);
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__u32 clc_len; /* calculated length */
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cFYI(0, "checkSMB Length: 0x%x, smb_buf_length: 0x%x",
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total_read, rfclen);
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/* is this frame too small to even get to a BCC? */
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if (total_read < 2 + sizeof(struct smb_hdr)) {
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if ((total_read >= sizeof(struct smb_hdr) - 1)
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&& (smb->Status.CifsError != 0)) {
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/* it's an error return */
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smb->WordCount = 0;
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/* some error cases do not return wct and bcc */
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return 0;
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} else if ((total_read == sizeof(struct smb_hdr) + 1) &&
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(smb->WordCount == 0)) {
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char *tmp = (char *)smb;
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/* Need to work around a bug in two servers here */
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/* First, check if the part of bcc they sent was zero */
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if (tmp[sizeof(struct smb_hdr)] == 0) {
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/* some servers return only half of bcc
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* on simple responses (wct, bcc both zero)
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* in particular have seen this on
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* ulogoffX and FindClose. This leaves
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* one byte of bcc potentially unitialized
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*/
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/* zero rest of bcc */
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tmp[sizeof(struct smb_hdr)+1] = 0;
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return 0;
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}
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cERROR(1, "rcvd invalid byte count (bcc)");
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} else {
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cERROR(1, "Length less than smb header size");
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}
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return -EIO;
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}
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/* otherwise, there is enough to get to the BCC */
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if (check_smb_hdr(smb, mid))
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return -EIO;
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clc_len = smbCalcSize(smb);
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if (4 + rfclen != total_read) {
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cERROR(1, "Length read does not match RFC1001 length %d",
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rfclen);
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return -EIO;
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}
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if (4 + rfclen != clc_len) {
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/* check if bcc wrapped around for large read responses */
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if ((rfclen > 64 * 1024) && (rfclen > clc_len)) {
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/* check if lengths match mod 64K */
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if (((4 + rfclen) & 0xFFFF) == (clc_len & 0xFFFF))
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return 0; /* bcc wrapped */
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}
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cFYI(1, "Calculated size %u vs length %u mismatch for mid=%u",
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clc_len, 4 + rfclen, smb->Mid);
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if (4 + rfclen < clc_len) {
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cERROR(1, "RFC1001 size %u smaller than SMB for mid=%u",
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rfclen, smb->Mid);
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return -EIO;
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} else if (rfclen > clc_len + 512) {
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/*
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* Some servers (Windows XP in particular) send more
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* data than the lengths in the SMB packet would
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* indicate on certain calls (byte range locks and
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* trans2 find first calls in particular). While the
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* client can handle such a frame by ignoring the
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* trailing data, we choose limit the amount of extra
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* data to 512 bytes.
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*/
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cERROR(1, "RFC1001 size %u more than 512 bytes larger "
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"than SMB for mid=%u", rfclen, smb->Mid);
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return -EIO;
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}
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}
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return 0;
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}
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bool
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is_valid_oplock_break(char *buffer, struct TCP_Server_Info *srv)
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{
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struct smb_hdr *buf = (struct smb_hdr *)buffer;
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struct smb_com_lock_req *pSMB = (struct smb_com_lock_req *)buf;
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struct list_head *tmp, *tmp1, *tmp2;
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struct cifs_ses *ses;
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struct cifs_tcon *tcon;
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struct cifsInodeInfo *pCifsInode;
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struct cifsFileInfo *netfile;
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cFYI(1, "Checking for oplock break or dnotify response");
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if ((pSMB->hdr.Command == SMB_COM_NT_TRANSACT) &&
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(pSMB->hdr.Flags & SMBFLG_RESPONSE)) {
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struct smb_com_transaction_change_notify_rsp *pSMBr =
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(struct smb_com_transaction_change_notify_rsp *)buf;
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struct file_notify_information *pnotify;
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__u32 data_offset = 0;
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if (get_bcc(buf) > sizeof(struct file_notify_information)) {
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data_offset = le32_to_cpu(pSMBr->DataOffset);
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pnotify = (struct file_notify_information *)
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((char *)&pSMBr->hdr.Protocol + data_offset);
|
|
cFYI(1, "dnotify on %s Action: 0x%x",
|
|
pnotify->FileName, pnotify->Action);
|
|
/* cifs_dump_mem("Rcvd notify Data: ",buf,
|
|
sizeof(struct smb_hdr)+60); */
|
|
return true;
|
|
}
|
|
if (pSMBr->hdr.Status.CifsError) {
|
|
cFYI(1, "notify err 0x%d",
|
|
pSMBr->hdr.Status.CifsError);
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
if (pSMB->hdr.Command != SMB_COM_LOCKING_ANDX)
|
|
return false;
|
|
if (pSMB->hdr.Flags & SMBFLG_RESPONSE) {
|
|
/* no sense logging error on invalid handle on oplock
|
|
break - harmless race between close request and oplock
|
|
break response is expected from time to time writing out
|
|
large dirty files cached on the client */
|
|
if ((NT_STATUS_INVALID_HANDLE) ==
|
|
le32_to_cpu(pSMB->hdr.Status.CifsError)) {
|
|
cFYI(1, "invalid handle on oplock break");
|
|
return true;
|
|
} else if (ERRbadfid ==
|
|
le16_to_cpu(pSMB->hdr.Status.DosError.Error)) {
|
|
return true;
|
|
} else {
|
|
return false; /* on valid oplock brk we get "request" */
|
|
}
|
|
}
|
|
if (pSMB->hdr.WordCount != 8)
|
|
return false;
|
|
|
|
cFYI(1, "oplock type 0x%d level 0x%d",
|
|
pSMB->LockType, pSMB->OplockLevel);
|
|
if (!(pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE))
|
|
return false;
|
|
|
|
/* look up tcon based on tid & uid */
|
|
spin_lock(&cifs_tcp_ses_lock);
|
|
list_for_each(tmp, &srv->smb_ses_list) {
|
|
ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
|
|
list_for_each(tmp1, &ses->tcon_list) {
|
|
tcon = list_entry(tmp1, struct cifs_tcon, tcon_list);
|
|
if (tcon->tid != buf->Tid)
|
|
continue;
|
|
|
|
cifs_stats_inc(&tcon->num_oplock_brks);
|
|
spin_lock(&cifs_file_list_lock);
|
|
list_for_each(tmp2, &tcon->openFileList) {
|
|
netfile = list_entry(tmp2, struct cifsFileInfo,
|
|
tlist);
|
|
if (pSMB->Fid != netfile->netfid)
|
|
continue;
|
|
|
|
cFYI(1, "file id match, oplock break");
|
|
pCifsInode = CIFS_I(netfile->dentry->d_inode);
|
|
|
|
cifs_set_oplock_level(pCifsInode,
|
|
pSMB->OplockLevel ? OPLOCK_READ : 0);
|
|
queue_work(cifsiod_wq,
|
|
&netfile->oplock_break);
|
|
netfile->oplock_break_cancelled = false;
|
|
|
|
spin_unlock(&cifs_file_list_lock);
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
return true;
|
|
}
|
|
spin_unlock(&cifs_file_list_lock);
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
cFYI(1, "No matching file for oplock break");
|
|
return true;
|
|
}
|
|
}
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
cFYI(1, "Can not process oplock break for non-existent connection");
|
|
return true;
|
|
}
|
|
|
|
void
|
|
dump_smb(void *buf, int smb_buf_length)
|
|
{
|
|
int i, j;
|
|
char debug_line[17];
|
|
unsigned char *buffer = buf;
|
|
|
|
if (traceSMB == 0)
|
|
return;
|
|
|
|
for (i = 0, j = 0; i < smb_buf_length; i++, j++) {
|
|
if (i % 8 == 0) {
|
|
/* have reached the beginning of line */
|
|
printk(KERN_DEBUG "| ");
|
|
j = 0;
|
|
}
|
|
printk("%0#4x ", buffer[i]);
|
|
debug_line[2 * j] = ' ';
|
|
if (isprint(buffer[i]))
|
|
debug_line[1 + (2 * j)] = buffer[i];
|
|
else
|
|
debug_line[1 + (2 * j)] = '_';
|
|
|
|
if (i % 8 == 7) {
|
|
/* reached end of line, time to print ascii */
|
|
debug_line[16] = 0;
|
|
printk(" | %s\n", debug_line);
|
|
}
|
|
}
|
|
for (; j < 8; j++) {
|
|
printk(" ");
|
|
debug_line[2 * j] = ' ';
|
|
debug_line[1 + (2 * j)] = ' ';
|
|
}
|
|
printk(" | %s\n", debug_line);
|
|
return;
|
|
}
|
|
|
|
void
|
|
cifs_autodisable_serverino(struct cifs_sb_info *cifs_sb)
|
|
{
|
|
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
|
|
cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM;
|
|
cERROR(1, "Autodisabling the use of server inode numbers on "
|
|
"%s. This server doesn't seem to support them "
|
|
"properly. Hardlinks will not be recognized on this "
|
|
"mount. Consider mounting with the \"noserverino\" "
|
|
"option to silence this message.",
|
|
cifs_sb_master_tcon(cifs_sb)->treeName);
|
|
}
|
|
}
|
|
|
|
void cifs_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock)
|
|
{
|
|
oplock &= 0xF;
|
|
|
|
if (oplock == OPLOCK_EXCLUSIVE) {
|
|
cinode->clientCanCacheAll = true;
|
|
cinode->clientCanCacheRead = true;
|
|
cFYI(1, "Exclusive Oplock granted on inode %p",
|
|
&cinode->vfs_inode);
|
|
} else if (oplock == OPLOCK_READ) {
|
|
cinode->clientCanCacheAll = false;
|
|
cinode->clientCanCacheRead = true;
|
|
cFYI(1, "Level II Oplock granted on inode %p",
|
|
&cinode->vfs_inode);
|
|
} else {
|
|
cinode->clientCanCacheAll = false;
|
|
cinode->clientCanCacheRead = false;
|
|
}
|
|
}
|
|
|
|
bool
|
|
backup_cred(struct cifs_sb_info *cifs_sb)
|
|
{
|
|
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID) {
|
|
if (cifs_sb->mnt_backupuid == current_fsuid())
|
|
return true;
|
|
}
|
|
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID) {
|
|
if (in_group_p(cifs_sb->mnt_backupgid))
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
void
|
|
cifs_add_credits(struct TCP_Server_Info *server, const unsigned int add)
|
|
{
|
|
spin_lock(&server->req_lock);
|
|
server->credits += add;
|
|
server->in_flight--;
|
|
spin_unlock(&server->req_lock);
|
|
wake_up(&server->request_q);
|
|
}
|
|
|
|
void
|
|
cifs_set_credits(struct TCP_Server_Info *server, const int val)
|
|
{
|
|
spin_lock(&server->req_lock);
|
|
server->credits = val;
|
|
server->oplocks = val > 1 ? enable_oplocks : false;
|
|
spin_unlock(&server->req_lock);
|
|
}
|