1 files changed, 516 insertions, 0 deletions

diff --git a/fs/cifs/misc.c b/fs/cifs/misc.c
new file mode 100644
index 0000000..7b38d30
--- /dev/null
+++ b/fs/cifs/misc.c
@@ -0,0 +1,516 @@
+/*
+ *   fs/cifs/misc.c
+ *
+ *   Copyright (C) International Business Machines  Corp., 2002,2004
+ *   Author(s): Steve French (sfrench@us.ibm.com)
+ *
+ *   This library is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU Lesser General Public License as published
+ *   by the Free Software Foundation; either version 2.1 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This library is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
+ *   the GNU Lesser General Public License for more details.
+ *
+ *   You should have received a copy of the GNU Lesser General Public License
+ *   along with this library; if not, write to the Free Software
+ *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 
+ */
+
+#include <linux/slab.h>
+#include <linux/ctype.h>
+#include <linux/mempool.h>
+#include "cifspdu.h"
+#include "cifsglob.h"
+#include "cifsproto.h"
+#include "cifs_debug.h"
+#include "smberr.h"
+#include "nterr.h"
+
+extern mempool_t *cifs_sm_req_poolp;
+extern mempool_t *cifs_req_poolp;
+extern struct task_struct * oplockThread;
+
+static __u16 GlobalMid;		/* multiplex id - rotating counter */
+
+/* The xid serves as a useful identifier for each incoming vfs request, 
+   in a similar way to the mid which is useful to track each sent smb, 
+   and CurrentXid can also provide a running counter (although it 
+   will eventually wrap past zero) of the total vfs operations handled 
+   since the cifs fs was mounted */
+
+unsigned int
+_GetXid(void)
+{
+	unsigned int xid;
+
+	spin_lock(&GlobalMid_Lock);
+	GlobalTotalActiveXid++;
+	if (GlobalTotalActiveXid > GlobalMaxActiveXid)
+		GlobalMaxActiveXid = GlobalTotalActiveXid;	/* keep high water mark for number of simultaneous vfs ops in our filesystem */
+	xid = GlobalCurrentXid++;
+	spin_unlock(&GlobalMid_Lock);
+	return xid;
+}
+
+void
+_FreeXid(unsigned int xid)
+{
+	spin_lock(&GlobalMid_Lock);
+	/* if(GlobalTotalActiveXid == 0)
+		BUG(); */
+	GlobalTotalActiveXid--;
+	spin_unlock(&GlobalMid_Lock);
+}
+
+struct cifsSesInfo *
+sesInfoAlloc(void)
+{
+	struct cifsSesInfo *ret_buf;
+
+	ret_buf =
+	    (struct cifsSesInfo *) kmalloc(sizeof (struct cifsSesInfo),
+					   GFP_KERNEL);
+	if (ret_buf) {
+		memset(ret_buf, 0, sizeof (struct cifsSesInfo));
+		write_lock(&GlobalSMBSeslock);
+		atomic_inc(&sesInfoAllocCount);
+		ret_buf->status = CifsNew;
+		list_add(&ret_buf->cifsSessionList, &GlobalSMBSessionList);
+		init_MUTEX(&ret_buf->sesSem);
+		write_unlock(&GlobalSMBSeslock);
+	}
+	return ret_buf;
+}
+
+void
+sesInfoFree(struct cifsSesInfo *buf_to_free)
+{
+	if (buf_to_free == NULL) {
+		cFYI(1, ("Null buffer passed to sesInfoFree"));
+		return;
+	}
+
+	write_lock(&GlobalSMBSeslock);
+	atomic_dec(&sesInfoAllocCount);
+	list_del(&buf_to_free->cifsSessionList);
+	write_unlock(&GlobalSMBSeslock);
+	if (buf_to_free->serverOS)
+		kfree(buf_to_free->serverOS);
+	if (buf_to_free->serverDomain)
+		kfree(buf_to_free->serverDomain);
+	if (buf_to_free->serverNOS)
+		kfree(buf_to_free->serverNOS);
+	if (buf_to_free->password)
+		kfree(buf_to_free->password);
+	kfree(buf_to_free);
+}
+
+struct cifsTconInfo *
+tconInfoAlloc(void)
+{
+	struct cifsTconInfo *ret_buf;
+	ret_buf =
+	    (struct cifsTconInfo *) kmalloc(sizeof (struct cifsTconInfo),
+					    GFP_KERNEL);
+	if (ret_buf) {
+		memset(ret_buf, 0, sizeof (struct cifsTconInfo));
+		write_lock(&GlobalSMBSeslock);
+		atomic_inc(&tconInfoAllocCount);
+		list_add(&ret_buf->cifsConnectionList,
+			 &GlobalTreeConnectionList);
+		ret_buf->tidStatus = CifsNew;
+		INIT_LIST_HEAD(&ret_buf->openFileList);
+		init_MUTEX(&ret_buf->tconSem);
+#ifdef CONFIG_CIFS_STATS
+		spin_lock_init(&ret_buf->stat_lock);
+#endif
+		write_unlock(&GlobalSMBSeslock);
+	}
+	return ret_buf;
+}
+
+void
+tconInfoFree(struct cifsTconInfo *buf_to_free)
+{
+	if (buf_to_free == NULL) {
+		cFYI(1, ("Null buffer passed to tconInfoFree"));
+		return;
+	}
+	write_lock(&GlobalSMBSeslock);
+	atomic_dec(&tconInfoAllocCount);
+	list_del(&buf_to_free->cifsConnectionList);
+	write_unlock(&GlobalSMBSeslock);
+	if (buf_to_free->nativeFileSystem)
+		kfree(buf_to_free->nativeFileSystem);
+	kfree(buf_to_free);
+}
+
+struct smb_hdr *
+cifs_buf_get(void)
+{
+	struct smb_hdr *ret_buf = NULL;
+
+/* We could use negotiated size instead of max_msgsize - 
+   but it may be more efficient to always alloc same size 
+   albeit slightly larger than necessary and maxbuffersize 
+   defaults to this and can not be bigger */
+	ret_buf =
+	    (struct smb_hdr *) mempool_alloc(cifs_req_poolp, SLAB_KERNEL | SLAB_NOFS);
+
+	/* clear the first few header bytes */
+	/* for most paths, more is cleared in header_assemble */
+	if (ret_buf) {
+		memset(ret_buf, 0, sizeof(struct smb_hdr) + 3);
+		atomic_inc(&bufAllocCount);
+	}
+
+	return ret_buf;
+}
+
+void
+cifs_buf_release(void *buf_to_free)
+{
+
+	if (buf_to_free == NULL) {
+		/* cFYI(1, ("Null buffer passed to cifs_buf_release"));*/
+		return;
+	}
+	mempool_free(buf_to_free,cifs_req_poolp);
+
+	atomic_dec(&bufAllocCount);
+	return;
+}
+
+struct smb_hdr *
+cifs_small_buf_get(void)
+{
+	struct smb_hdr *ret_buf = NULL;
+
+/* We could use negotiated size instead of max_msgsize - 
+   but it may be more efficient to always alloc same size 
+   albeit slightly larger than necessary and maxbuffersize 
+   defaults to this and can not be bigger */
+	ret_buf =
+	    (struct smb_hdr *) mempool_alloc(cifs_sm_req_poolp, SLAB_KERNEL | SLAB_NOFS);
+	if (ret_buf) {
+	/* No need to clear memory here, cleared in header assemble */
+	/*	memset(ret_buf, 0, sizeof(struct smb_hdr) + 27);*/
+		atomic_inc(&smBufAllocCount);
+	}
+	return ret_buf;
+}
+
+void
+cifs_small_buf_release(void *buf_to_free)
+{
+
+	if (buf_to_free == NULL) {
+		cFYI(1, ("Null buffer passed to cifs_small_buf_release"));
+		return;
+	}
+	mempool_free(buf_to_free,cifs_sm_req_poolp);
+
+	atomic_dec(&smBufAllocCount);
+	return;
+}
+
+void
+header_assemble(struct smb_hdr *buffer, char smb_command /* command */ ,
+		const struct cifsTconInfo *treeCon, int word_count
+		/* length of fixed section (word count) in two byte units  */)
+{
+	struct list_head* temp_item;
+	struct cifsSesInfo * ses;
+	char *temp = (char *) buffer;
+
+	memset(temp,0,MAX_CIFS_HDR_SIZE);
+
+	buffer->smb_buf_length =
+	    (2 * word_count) + sizeof (struct smb_hdr) -
+	    4 /*  RFC 1001 length field does not count */  +
+	    2 /* for bcc field itself */ ;
+	/* Note that this is the only network field that has to be converted to big endian and it is done just before we send it */
+
+	buffer->Protocol[0] = 0xFF;
+	buffer->Protocol[1] = 'S';
+	buffer->Protocol[2] = 'M';
+	buffer->Protocol[3] = 'B';
+	buffer->Command = smb_command;
+	buffer->Flags = 0x00;	/* case sensitive */
+	buffer->Flags2 = SMBFLG2_KNOWS_LONG_NAMES;
+	buffer->Pid = cpu_to_le16((__u16)current->tgid);
+	buffer->PidHigh = cpu_to_le16((__u16)(current->tgid >> 16));
+	spin_lock(&GlobalMid_Lock);
+	GlobalMid++;
+	buffer->Mid = GlobalMid;
+	spin_unlock(&GlobalMid_Lock);
+	if (treeCon) {
+		buffer->Tid = treeCon->tid;
+		if (treeCon->ses) {
+			if (treeCon->ses->capabilities & CAP_UNICODE)
+				buffer->Flags2 |= SMBFLG2_UNICODE;
+			if (treeCon->ses->capabilities & CAP_STATUS32) {
+				buffer->Flags2 |= SMBFLG2_ERR_STATUS;
+			}
+
+			buffer->Uid = treeCon->ses->Suid;	/* always in LE format */
+			if(multiuser_mount != 0) {
+		/* For the multiuser case, there are few obvious technically  */
+		/* possible mechanisms to match the local linux user (uid)    */
+		/* to a valid remote smb user (smb_uid):		      */
+		/* 	1) Query Winbind (or other local pam/nss daemon       */
+		/* 	  for userid/password/logon_domain or credential      */
+		/*      2) Query Winbind for uid to sid to username mapping   */
+		/* 	   and see if we have a matching password for existing*/
+		/*         session for that user perhas getting password by   */
+		/*         adding a new pam_cifs module that stores passwords */
+		/*         so that the cifs vfs can get at that for all logged*/
+		/*	   on users					      */
+		/*	3) (Which is the mechanism we have chosen)	      */
+		/*	   Search through sessions to the same server for a   */
+		/*	   a match on the uid that was passed in on mount     */
+		/*         with the current processes uid (or euid?) and use  */
+		/* 	   that smb uid.   If no existing smb session for     */
+		/* 	   that uid found, use the default smb session ie     */
+		/*         the smb session for the volume mounted which is    */
+		/* 	   the same as would be used if the multiuser mount   */
+		/* 	   flag were disabled.  */
+
+		/*  BB Add support for establishing new tCon and SMB Session  */
+		/*      with userid/password pairs found on the smb session   */ 
+		/*	for other target tcp/ip addresses 		BB    */
+				if(current->uid != treeCon->ses->linux_uid) {
+					cFYI(1,("Multiuser mode and UID did not match tcon uid "));
+					read_lock(&GlobalSMBSeslock);
+					list_for_each(temp_item, &GlobalSMBSessionList) {
+						ses = list_entry(temp_item, struct cifsSesInfo, cifsSessionList);
+						if(ses->linux_uid == current->uid) {
+							if(ses->server == treeCon->ses->server) {
+								cFYI(1,("found matching uid substitute right smb_uid"));  
+								buffer->Uid = ses->Suid;
+								break;
+							} else {
+								/* BB eventually call cifs_setup_session here */
+								cFYI(1,("local UID found but smb sess with this server does not exist"));  
+							}
+						}
+					}
+					read_unlock(&GlobalSMBSeslock);
+				}
+			}
+		}
+		if (treeCon->Flags & SMB_SHARE_IS_IN_DFS)
+			buffer->Flags2 |= SMBFLG2_DFS;
+		if((treeCon->ses) && (treeCon->ses->server))
+			if(treeCon->ses->server->secMode & 
+			  (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
+				buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
+	}
+
+/*  endian conversion of flags is now done just before sending */
+	buffer->WordCount = (char) word_count;
+	return;
+}
+
+int
+checkSMBhdr(struct smb_hdr *smb, __u16 mid)
+{
+	/* Make sure that this really is an SMB, that it is a response, 
+	   and that the message ids match */
+	if ((*(__le32 *) smb->Protocol == cpu_to_le32(0x424d53ff)) && 
+		(mid == smb->Mid)) {    
+		if(smb->Flags & SMBFLG_RESPONSE)
+			return 0;                    
+		else {        
+		/* only one valid case where server sends us request */
+			if(smb->Command == SMB_COM_LOCKING_ANDX)
+				return 0;
+			else
+				cERROR(1, ("Rcvd Request not response "));         
+		}
+	} else { /* bad signature or mid */
+		if (*(__le32 *) smb->Protocol != cpu_to_le32(0x424d53ff))
+			cERROR(1,
+			       ("Bad protocol string signature header %x ",
+				*(unsigned int *) smb->Protocol));
+		if (mid != smb->Mid)
+			cERROR(1, ("Mids do not match"));
+	}
+	cERROR(1, ("bad smb detected. The Mid=%d", smb->Mid));
+	return 1;
+}
+
+int
+checkSMB(struct smb_hdr *smb, __u16 mid, int length)
+{
+	__u32 len = be32_to_cpu(smb->smb_buf_length);
+	cFYI(0,
+	     ("Entering checkSMB with Length: %x, smb_buf_length: %x ",
+	      length, len));
+	if (((unsigned int)length < 2 + sizeof (struct smb_hdr)) ||
+	    (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4)) {
+		if ((unsigned int)length < 2 + sizeof (struct smb_hdr)) {
+			if (((unsigned int)length >= 
+				sizeof (struct smb_hdr) - 1)
+			    && (smb->Status.CifsError != 0)) {
+				smb->WordCount = 0;
+				return 0;	/* some error cases do not return wct and bcc */
+			} else {
+				cERROR(1, ("Length less than smb header size"));
+			}
+
+		}
+		if (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4)
+			cERROR(1,
+			       ("smb_buf_length greater than MaxBufSize"));
+		cERROR(1,
+		       ("bad smb detected. Illegal length. The mid=%d",
+			smb->Mid));
+		return 1;
+	}
+
+	if (checkSMBhdr(smb, mid))
+		return 1;
+
+	if ((4 + len != smbCalcSize(smb))
+	    || (4 + len != (unsigned int)length)) {
+		return 0;
+	} else {
+		cERROR(1, ("smbCalcSize %x ", smbCalcSize(smb)));
+		cERROR(1,
+		       ("bad smb size detected. The Mid=%d", smb->Mid));
+		return 1;
+	}
+}
+int
+is_valid_oplock_break(struct smb_hdr *buf)
+{    
+	struct smb_com_lock_req * pSMB = (struct smb_com_lock_req *)buf;
+	struct list_head *tmp;
+	struct list_head *tmp1;
+	struct cifsTconInfo *tcon;
+	struct cifsFileInfo *netfile;
+
+	cFYI(1,("Checking for oplock break or dnotify response"));
+	if((pSMB->hdr.Command == SMB_COM_NT_TRANSACT) &&
+	   (pSMB->hdr.Flags & SMBFLG_RESPONSE)) {
+		struct smb_com_transaction_change_notify_rsp * pSMBr =
+			(struct smb_com_transaction_change_notify_rsp *)buf;
+		struct file_notify_information * pnotify;
+		__u32 data_offset = 0;
+		if(pSMBr->ByteCount > sizeof(struct file_notify_information)) {
+			data_offset = le32_to_cpu(pSMBr->DataOffset);
+
+			pnotify = (struct file_notify_information *)((char *)&pSMBr->hdr.Protocol
+				+ data_offset);
+			cFYI(1,("dnotify on %s with action: 0x%x",pnotify->FileName,
+				pnotify->Action));  /* BB removeme BB */
+	             /*   cifs_dump_mem("Received notify Data is: ",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 */
+	read_lock(&GlobalSMBSeslock);
+	list_for_each(tmp, &GlobalTreeConnectionList) {
+		tcon = list_entry(tmp, struct cifsTconInfo, cifsConnectionList);
+		if (tcon->tid == buf->Tid) {
+#ifdef CONFIG_CIFS_STATS
+			atomic_inc(&tcon->num_oplock_brks);
+#endif
+			list_for_each(tmp1,&tcon->openFileList){
+				netfile = list_entry(tmp1,struct cifsFileInfo,tlist);
+				if(pSMB->Fid == netfile->netfid) {
+					struct cifsInodeInfo *pCifsInode;
+					read_unlock(&GlobalSMBSeslock);
+					cFYI(1,("Matching file id, processing oplock break"));
+					pCifsInode = 
+						CIFS_I(netfile->pInode);
+					pCifsInode->clientCanCacheAll = FALSE;
+					if(pSMB->OplockLevel == 0)
+						pCifsInode->clientCanCacheRead = FALSE;
+					pCifsInode->oplockPending = TRUE;
+					AllocOplockQEntry(netfile->pInode, netfile->netfid, tcon);
+					cFYI(1,("about to wake up oplock thd"));
+					wake_up_process(oplockThread);               
+					return TRUE;
+				}
+			}
+			read_unlock(&GlobalSMBSeslock);
+			cFYI(1,("No matching file for oplock break on connection"));
+			return TRUE;
+		}
+	}
+	read_unlock(&GlobalSMBSeslock);
+	cFYI(1,("Can not process oplock break for non-existent connection"));
+	return TRUE;
+}
+
+void
+dump_smb(struct smb_hdr *smb_buf, int smb_buf_length)
+{
+	int i, j;
+	char debug_line[17];
+	unsigned char *buffer;
+
+	if (traceSMB == 0)
+		return;
+
+	buffer = (unsigned char *) smb_buf;
+	for (i = 0, j = 0; i < smb_buf_length; i++, j++) {
+		if (i % 8 == 0) {	/* we 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) {	/* we have 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;
+}