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[CIFS] Do not send newer QFSInfo to legacy servers which can not support it 

Fix dialect negotiation to save off when we have negotiated lanman.
This allows us to avoid sending some somewhat newer requests that the server
can not handle and go directly to the older version (infolevel) of the same
call. Make sure we try to negotiate a level which allows us to get the
server OS (which we check so we can detect Win9x vs. other legacy servers
and eventually work around the Win9x DOS time bug (they reverse date/time
fields).

Signed-off-by: Steve French <sfrench@us.ibm.com>
This commit is contained in:
Steve French 2006-09-30 04:13:17 +00:00
parent f46d3e1190
commit 9ac00b7d96
6 changed files with 32 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
fs/cifs/cifsfs.c
View File

@ -199,10 +199,12 @@ cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
/* Only need to call the old QFSInfo if failed
on newer one */
if(rc)
rc = CIFSSMBQFSInfo(xid, pTcon, buf);
if((pTcon->ses->flags & CIFS_SES_LANMAN) == 0)
rc = CIFSSMBQFSInfo(xid, pTcon, buf); /* not supported by OS2 */
/* Old Windows servers do not support level 103, retry with level
one if old server failed the previous call */
/* Some old Windows servers also do not support level 103, retry with
older level one if old server failed the previous call or we
bypassed it because we detected that this was an older LANMAN sess */
if(rc)
rc = SMBOldQFSInfo(xid, pTcon, buf);
/*

9
fs/cifs/cifsglob.h
View File

@ -203,9 +203,14 @@ struct cifsSesInfo {
char * domainName;
char * password;
};
/* session flags */
/* no more than one of the following three session flags may be set */
#define CIFS_SES_NT4 1
#define CIFS_SES_OS2 2
#define CIFS_SES_W9X 4
/* following flag is set for old servers such as OS2 (and Win95?)
which do not negotiate NTLM or POSIX dialects, but instead
negotiate one of the older LANMAN dialects */
#define CIFS_SES_LANMAN 8
/*
* there is one of these for each connection to a resource on a particular
* session

3
fs/cifs/cifspdu.h
View File

@ -26,7 +26,8 @@
#ifdef CONFIG_CIFS_WEAK_PW_HASH
#define LANMAN_PROT 0
#define CIFS_PROT 1
#define LANMAN2_PROT 1
#define CIFS_PROT 2
#else
#define CIFS_PROT 0
#endif

8
fs/cifs/cifssmb.c
View File

@ -46,6 +46,7 @@ static struct {
} protocols[] = {
#ifdef CONFIG_CIFS_WEAK_PW_HASH
{LANMAN_PROT, "\2LM1.2X002"},
{LANMAN2_PROT, "\2LANMAN2.1"},
#endif /* weak password hashing for legacy clients */
{CIFS_PROT, "\2NT LM 0.12"},
{POSIX_PROT, "\2POSIX 2"},
@ -67,13 +68,13 @@ static struct {
/* define the number of elements in the cifs dialect array */
#ifdef CONFIG_CIFS_POSIX
#ifdef CONFIG_CIFS_WEAK_PW_HASH
#define CIFS_NUM_PROT 3
#define CIFS_NUM_PROT 4
#else
#define CIFS_NUM_PROT 2
#endif /* CIFS_WEAK_PW_HASH */
#else /* not posix */
#ifdef CONFIG_CIFS_WEAK_PW_HASH
#define CIFS_NUM_PROT 2
#define CIFS_NUM_PROT 3
#else
#define CIFS_NUM_PROT 1
#endif /* CONFIG_CIFS_WEAK_PW_HASH */
@ -446,7 +447,8 @@ CIFSSMBNegotiate(unsigned int xid, struct cifsSesInfo *ses)
goto neg_err_exit;
#ifdef CONFIG_CIFS_WEAK_PW_HASH
} else if((pSMBr->hdr.WordCount == 13)
&& (pSMBr->DialectIndex == LANMAN_PROT)) {
&& ((pSMBr->DialectIndex == LANMAN_PROT)
|| (pSMBr->DialectIndex == LANMAN2_PROT))) {
int tmp, adjust;
struct lanman_neg_rsp * rsp = (struct lanman_neg_rsp *)pSMBr;

1
fs/cifs/connect.c
View File

@ -3316,6 +3316,7 @@ int cifs_setup_session(unsigned int xid, struct cifsSesInfo *pSesInfo,
first_time = 1;
}
if (!rc) {
pSesInfo->flags = 0;
pSesInfo->capabilities = pSesInfo->server->capabilities;
if(linuxExtEnabled == 0)
pSesInfo->capabilities &= (~CAP_UNIX);

23
fs/cifs/sess.c
View File

@ -268,6 +268,10 @@ static int decode_ascii_ssetup(char ** pbcc_area, int bleft, struct cifsSesInfo
ses->serverOS = kzalloc(len + 1, GFP_KERNEL);
if(ses->serverOS)
strncpy(ses->serverOS, bcc_ptr, len);
if(strncmp(ses->serverOS, "OS/2",4) == 0) {
cFYI(1,("OS/2 server"));
ses->flags |= CIFS_SES_OS2;
}
bcc_ptr += len + 1;
bleft -= len + 1;
@ -290,16 +294,11 @@ static int decode_ascii_ssetup(char ** pbcc_area, int bleft, struct cifsSesInfo
if(len > bleft)
return rc;
if(ses->serverDomain)
kfree(ses->serverDomain);
ses->serverDomain = kzalloc(len + 1, GFP_KERNEL);
if(ses->serverOS)
strncpy(ses->serverOS, bcc_ptr, len);
bcc_ptr += len + 1;
bleft -= len + 1;
/* No domain field in LANMAN case. Domain is
returned by old servers in the SMB negprot response */
/* BB For newer servers which do not support Unicode,
but thus do return domain here we could add parsing
for it later, but it is not very important */
cFYI(1,("ascii: bytes left %d",bleft));
return rc;
@ -366,6 +365,8 @@ CIFS_SessSetup(unsigned int xid, struct cifsSesInfo *ses, int first_time,
str_area = kmalloc(2000, GFP_KERNEL);
bcc_ptr = str_area;
ses->flags &= ~CIFS_SES_LANMAN;
if(type == LANMAN) {
#ifdef CONFIG_CIFS_WEAK_PW_HASH
char lnm_session_key[CIFS_SESS_KEY_SIZE];
@ -377,7 +378,7 @@ CIFS_SessSetup(unsigned int xid, struct cifsSesInfo *ses, int first_time,
/* and copy into bcc */
calc_lanman_hash(ses, lnm_session_key);
ses->flags |= CIFS_SES_LANMAN;
/* #ifdef CONFIG_CIFS_DEBUG2
cifs_dump_mem("cryptkey: ",ses->server->cryptKey,
CIFS_SESS_KEY_SIZE);