4 * Copyright (C) 2001 by Urban Widmark
6 * Please add a note about your changes to smbfs in the ChangeLog file.
9 #include <linux/types.h>
11 #include <linux/slab.h>
12 #include <linux/net.h>
14 #include <linux/smb_fs.h>
15 #include <linux/smbno.h>
16 #include <linux/smb_mount.h>
18 #include "smb_debug.h"
22 /* #define SMB_SLAB_DEBUG (SLAB_RED_ZONE | SLAB_POISON) */
23 #define SMB_SLAB_DEBUG 0
25 #define ROUND_UP(x) (((x)+3) & ~3)
27 /* cache for request structures */
28 static kmem_cache_t
*req_cachep
;
32 name, active, num, objsize, active_slabs, num_slaps, #pages
36 int smb_init_request_cache(void)
38 req_cachep
= kmem_cache_create("smb_request",
39 sizeof(struct smb_request
), 0,
40 SMB_SLAB_DEBUG
| SLAB_HWCACHE_ALIGN
,
42 if (req_cachep
== NULL
)
48 void smb_destroy_request_cache(void)
50 if (kmem_cache_destroy(req_cachep
))
51 printk(KERN_INFO
"smb_destroy_request_cache: not all structures were freed\n");
55 * Allocate and initialise a request structure
57 static struct smb_request
*smb_do_alloc_request(struct smb_sb_info
*server
,
60 struct smb_request
*req
;
61 unsigned char *buf
= NULL
;
63 req
= kmem_cache_alloc(req_cachep
, SLAB_KERNEL
);
64 VERBOSE("allocating request: %p\n", req
);
69 buf
= smb_kmalloc(bufsize
, GFP_NOFS
);
71 kmem_cache_free(req_cachep
, req
);
76 memset(req
, 0, sizeof(struct smb_request
));
78 req
->rq_bufsize
= bufsize
;
79 req
->rq_server
= server
;
80 init_waitqueue_head(&req
->rq_wait
);
81 INIT_LIST_HEAD(&req
->rq_queue
);
82 atomic_set(&req
->rq_count
, 1);
88 struct smb_request
*smb_alloc_request(struct smb_sb_info
*server
, int bufsize
)
90 struct smb_request
*req
= NULL
;
93 atomic_inc(&server
->nr_requests
);
94 if (atomic_read(&server
->nr_requests
) <= MAX_REQUEST_HARD
) {
95 req
= smb_do_alloc_request(server
, bufsize
);
102 * Try to free up at least one request in order to stay
103 * below the hard limit
105 if (nfs_try_to_free_pages(server
))
108 if (signalled() && (server
->flags
& NFS_MOUNT_INTR
))
109 return ERR_PTR(-ERESTARTSYS
);
110 current
->policy
= SCHED_YIELD
;
113 /* FIXME: we want something like nfs does above, but that
114 requires changes to all callers and can wait. */
121 static void smb_free_request(struct smb_request
*req
)
123 atomic_dec(&req
->rq_server
->nr_requests
);
124 if (req
->rq_buffer
&& !(req
->rq_flags
& SMB_REQ_STATIC
))
125 smb_kfree(req
->rq_buffer
);
126 if (req
->rq_trans2buffer
)
127 smb_kfree(req
->rq_trans2buffer
);
128 kmem_cache_free(req_cachep
, req
);
132 * What prevents a rget to race with a rput? The count must never drop to zero
133 * while it is in use. Only rput if it is ok that it is free'd.
135 void smb_rget(struct smb_request
*req
)
137 atomic_inc(&req
->rq_count
);
139 void smb_rput(struct smb_request
*req
)
141 if (atomic_dec_and_test(&req
->rq_count
)) {
142 list_del_init(&req
->rq_queue
);
143 smb_free_request(req
);
147 /* setup to receive the data part of the SMB */
148 static int smb_setup_bcc(struct smb_request
*req
)
151 req
->rq_rlen
= smb_len(req
->rq_header
) + 4 - req
->rq_bytes_recvd
;
153 if (req
->rq_rlen
> req
->rq_bufsize
) {
154 PARANOIA("Packet too large %d > %d\n",
155 req
->rq_rlen
, req
->rq_bufsize
);
159 req
->rq_iov
[0].iov_base
= req
->rq_buffer
;
160 req
->rq_iov
[0].iov_len
= req
->rq_rlen
;
167 * Prepare a "normal" request structure.
169 static int smb_setup_request(struct smb_request
*req
)
171 int len
= smb_len(req
->rq_header
) + 4;
174 /* if we expect a data part in the reply we set the iov's to read it */
175 if (req
->rq_resp_bcc
)
176 req
->rq_setup_read
= smb_setup_bcc
;
178 /* This tries to support re-using the same request */
179 req
->rq_bytes_sent
= 0;
183 req
->rq_fragment
= 0;
184 if (req
->rq_trans2buffer
)
185 smb_kfree(req
->rq_trans2buffer
);
191 * Prepare a transaction2 request structure
193 static int smb_setup_trans2request(struct smb_request
*req
)
195 struct smb_sb_info
*server
= req
->rq_server
;
197 static unsigned char padding
[4] = { 0, };
199 /* I know the following is very ugly, but I want to build the
200 smb packet as efficiently as possible. */
202 const int smb_parameters
= 15;
203 const int header
= SMB_HEADER_LEN
+ 2 * smb_parameters
+ 2;
204 const int oparam
= ROUND_UP(header
+ 3);
205 const int odata
= ROUND_UP(oparam
+ req
->rq_lparm
);
206 const int bcc
= (req
->rq_data
? odata
+ req
->rq_ldata
:
207 oparam
+ req
->rq_lparm
) - header
;
209 if ((bcc
+ oparam
) > server
->opt
.max_xmit
)
211 smb_setup_header(req
, SMBtrans2
, smb_parameters
, bcc
);
214 * max parameters + max data + max setup == bufsize to make NT4 happy
215 * and not abort the transfer or split into multiple responses. It also
216 * makes smbfs happy as handling packets larger than the buffer size
219 * OS/2 is probably going to hate me for this ...
221 mparam
= SMB_TRANS2_MAX_PARAM
;
222 mdata
= req
->rq_bufsize
- mparam
;
224 mdata
= server
->opt
.max_xmit
- mparam
- 100;
231 /* NT/win2k has ~4k max_xmit, so with this we request more than it wants
232 to return as one SMB. Useful for testing the fragmented trans2
237 WSET(req
->rq_header
, smb_tpscnt
, req
->rq_lparm
);
238 WSET(req
->rq_header
, smb_tdscnt
, req
->rq_ldata
);
239 WSET(req
->rq_header
, smb_mprcnt
, mparam
);
240 WSET(req
->rq_header
, smb_mdrcnt
, mdata
);
241 WSET(req
->rq_header
, smb_msrcnt
, 0); /* max setup always 0 ? */
242 WSET(req
->rq_header
, smb_flags
, 0);
243 DSET(req
->rq_header
, smb_timeout
, 0);
244 WSET(req
->rq_header
, smb_pscnt
, req
->rq_lparm
);
245 WSET(req
->rq_header
, smb_psoff
, oparam
- 4);
246 WSET(req
->rq_header
, smb_dscnt
, req
->rq_ldata
);
247 WSET(req
->rq_header
, smb_dsoff
, req
->rq_data
? odata
- 4 : 0);
248 *(req
->rq_header
+ smb_suwcnt
) = 0x01; /* setup count */
249 *(req
->rq_header
+ smb_suwcnt
+ 1) = 0x00; /* reserved */
250 WSET(req
->rq_header
, smb_setup0
, req
->rq_trans2_command
);
253 req
->rq_iov
[0].iov_base
= (void *) req
->rq_header
;
254 req
->rq_iov
[0].iov_len
= oparam
;
255 req
->rq_iov
[1].iov_base
= (req
->rq_parm
==NULL
) ? padding
: req
->rq_parm
;
256 req
->rq_iov
[1].iov_len
= req
->rq_lparm
;
257 req
->rq_slen
= oparam
+ req
->rq_lparm
;
261 req
->rq_iov
[2].iov_base
= padding
;
262 req
->rq_iov
[2].iov_len
= odata
- oparam
- req
->rq_lparm
;
263 req
->rq_iov
[3].iov_base
= req
->rq_data
;
264 req
->rq_iov
[3].iov_len
= req
->rq_ldata
;
265 req
->rq_slen
= odata
+ req
->rq_ldata
;
268 /* always a data part for trans2 replies */
269 req
->rq_setup_read
= smb_setup_bcc
;
275 * Add a request and tell smbiod to process it
277 int smb_add_request(struct smb_request
*req
)
280 struct smb_sb_info
*server
= req
->rq_server
;
283 smb_setup_request(req
);
284 if (req
->rq_trans2_command
) {
285 if (req
->rq_buffer
== NULL
) {
286 PARANOIA("trans2 attempted without response buffer!\n");
289 result
= smb_setup_trans2request(req
);
294 #ifdef SMB_DEBUG_PACKET_SIZE
298 /* add 'req' to the queue of requests */
299 if (smb_lock_server_interruptible(server
))
303 * Try to send the request as the process. If that fails we queue the
304 * request and let smbiod send it later.
307 /* FIXME: each server has a number on the maximum number of parallel
308 requests. 10, 50 or so. We should not allow more requests to be
310 if (server
->mid
> 0xf000)
312 req
->rq_mid
= server
->mid
++;
313 WSET(req
->rq_header
, smb_mid
, req
->rq_mid
);
316 if (server
->state
== CONN_VALID
) {
317 if (list_empty(&server
->xmitq
))
318 result
= smb_request_send_req(req
);
320 /* Connection lost? */
321 server
->conn_error
= result
;
322 server
->state
= CONN_INVALID
;
326 list_add_tail(&req
->rq_queue
, &server
->xmitq
);
329 if (server
->state
!= CONN_VALID
)
330 smbiod_retry(server
);
332 smb_unlock_server(server
);
336 timeleft
= wait_event_interruptible_timeout(req
->rq_wait
,
337 req
->rq_flags
& SMB_REQ_RECEIVED
, 30*HZ
);
338 if (!timeleft
|| signal_pending(current
)) {
340 * On timeout or on interrupt we want to try and remove the
341 * request from the recvq/xmitq.
343 smb_lock_server(server
);
344 if (!(req
->rq_flags
& SMB_REQ_RECEIVED
)) {
345 list_del_init(&req
->rq_queue
);
348 smb_unlock_server(server
);
352 PARANOIA("request [%p, mid=%d] timed out!\n",
354 VERBOSE("smb_com: %02x\n", *(req
->rq_header
+ smb_com
));
355 VERBOSE("smb_rcls: %02x\n", *(req
->rq_header
+ smb_rcls
));
356 VERBOSE("smb_flg: %02x\n", *(req
->rq_header
+ smb_flg
));
357 VERBOSE("smb_tid: %04x\n", WVAL(req
->rq_header
, smb_tid
));
358 VERBOSE("smb_pid: %04x\n", WVAL(req
->rq_header
, smb_pid
));
359 VERBOSE("smb_uid: %04x\n", WVAL(req
->rq_header
, smb_uid
));
360 VERBOSE("smb_mid: %04x\n", WVAL(req
->rq_header
, smb_mid
));
361 VERBOSE("smb_wct: %02x\n", *(req
->rq_header
+ smb_wct
));
363 req
->rq_rcls
= ERRSRV
;
364 req
->rq_err
= ERRtimeout
;
366 /* Just in case it was "stuck" */
369 VERBOSE("woke up, rcls=%d\n", req
->rq_rcls
);
371 if (req
->rq_rcls
!= 0)
372 req
->rq_errno
= smb_errno(req
);
373 if (signal_pending(current
))
374 req
->rq_errno
= -ERESTARTSYS
;
375 return req
->rq_errno
;
379 * Send a request and place it on the recvq if successfully sent.
380 * Must be called with the server lock held.
382 int smb_request_send_req(struct smb_request
*req
)
384 struct smb_sb_info
*server
= req
->rq_server
;
387 result
= smb_send_request(req
);
388 if (result
< 0 && result
!= -EAGAIN
)
392 if (!(req
->rq_flags
& SMB_REQ_TRANSMITTED
))
395 list_del_init(&req
->rq_queue
);
396 list_add_tail(&req
->rq_queue
, &server
->recvq
);
403 * Sends one request for this server. (smbiod)
404 * Must be called with the server lock held.
405 * Returns: <0 on error
406 * 0 if no request could be completely sent
407 * 1 if all data for one request was sent
409 int smb_request_send_server(struct smb_sb_info
*server
)
411 struct list_head
*head
;
412 struct smb_request
*req
;
415 if (server
->state
!= CONN_VALID
)
418 /* dequeue first request, if any */
420 head
= server
->xmitq
.next
;
421 if (head
!= &server
->xmitq
) {
422 req
= list_entry(head
, struct smb_request
, rq_queue
);
427 result
= smb_request_send_req(req
);
429 server
->conn_error
= result
;
430 list_del_init(&req
->rq_queue
);
431 list_add(&req
->rq_queue
, &server
->xmitq
);
441 * Try to find a request matching this "mid". Typically the first entry will
442 * be the matching one.
444 static struct smb_request
*find_request(struct smb_sb_info
*server
, int mid
)
446 struct list_head
*tmp
;
447 struct smb_request
*req
= NULL
;
449 list_for_each(tmp
, &server
->recvq
) {
450 req
= list_entry(tmp
, struct smb_request
, rq_queue
);
451 if (req
->rq_mid
== mid
) {
458 VERBOSE("received reply with mid %d but no request!\n",
459 WVAL(server
->header
, smb_mid
));
460 server
->rstate
= SMB_RECV_DROP
;
467 * Called when we have read the smb header and believe this is a response.
469 static int smb_init_request(struct smb_sb_info
*server
, struct smb_request
*req
)
473 memcpy(req
->rq_header
, server
->header
, SMB_HEADER_LEN
);
475 wct
= *(req
->rq_header
+ smb_wct
);
477 PARANOIA("wct too large, %d > 20\n", wct
);
478 server
->rstate
= SMB_RECV_DROP
;
482 req
->rq_resp_wct
= wct
;
483 hdrlen
= SMB_HEADER_LEN
+ wct
*2 + 2;
484 VERBOSE("header length: %d smb_wct: %2d\n", hdrlen
, wct
);
486 req
->rq_bytes_recvd
= SMB_HEADER_LEN
;
487 req
->rq_rlen
= hdrlen
;
488 req
->rq_iov
[0].iov_base
= req
->rq_header
;
489 req
->rq_iov
[0].iov_len
= hdrlen
;
491 server
->rstate
= SMB_RECV_PARAM
;
493 #ifdef SMB_DEBUG_PACKET_SIZE
494 add_recv_stats(smb_len(server
->header
));
500 * Reads the SMB parameters
502 static int smb_recv_param(struct smb_sb_info
*server
, struct smb_request
*req
)
506 result
= smb_receive(server
, req
);
509 if (req
->rq_bytes_recvd
< req
->rq_rlen
)
512 VERBOSE("result: %d smb_bcc: %04x\n", result
,
513 WVAL(req
->rq_header
, SMB_HEADER_LEN
+
514 (*(req
->rq_header
+ smb_wct
) * 2)));
517 req
->rq_iov
[0].iov_base
= NULL
;
519 if (req
->rq_callback
)
520 req
->rq_callback(req
);
521 else if (req
->rq_setup_read
)
522 result
= req
->rq_setup_read(req
);
524 server
->rstate
= SMB_RECV_DROP
;
528 server
->rstate
= req
->rq_rlen
> 0 ? SMB_RECV_DATA
: SMB_RECV_END
;
530 req
->rq_bytes_recvd
= 0; // recvd out of the iov
532 VERBOSE("rlen: %d\n", req
->rq_rlen
);
533 if (req
->rq_rlen
< 0) {
534 PARANOIA("Parameters read beyond end of packet!\n");
535 server
->rstate
= SMB_RECV_END
;
544 static int smb_recv_data(struct smb_sb_info
*server
, struct smb_request
*req
)
548 result
= smb_receive(server
, req
);
551 if (req
->rq_bytes_recvd
< req
->rq_rlen
)
553 server
->rstate
= SMB_RECV_END
;
555 VERBOSE("result: %d\n", result
);
560 * Receive a transaction2 response
561 * Return: 0 if the response has been fully read
562 * 1 if there are further "fragments" to read
563 * <0 if there is an error
565 static int smb_recv_trans2(struct smb_sb_info
*server
, struct smb_request
*req
)
567 unsigned char *inbuf
;
568 unsigned int parm_disp
, parm_offset
, parm_count
, parm_tot
;
569 unsigned int data_disp
, data_offset
, data_count
, data_tot
;
570 int hdrlen
= SMB_HEADER_LEN
+ req
->rq_resp_wct
*2 - 2;
572 VERBOSE("handling trans2\n");
574 inbuf
= req
->rq_header
;
575 data_tot
= WVAL(inbuf
, smb_tdrcnt
);
576 parm_tot
= WVAL(inbuf
, smb_tprcnt
);
577 parm_disp
= WVAL(inbuf
, smb_prdisp
);
578 parm_offset
= WVAL(inbuf
, smb_proff
);
579 parm_count
= WVAL(inbuf
, smb_prcnt
);
580 data_disp
= WVAL(inbuf
, smb_drdisp
);
581 data_offset
= WVAL(inbuf
, smb_droff
);
582 data_count
= WVAL(inbuf
, smb_drcnt
);
584 /* Modify offset for the split header/buffer we use */
585 data_offset
-= hdrlen
;
586 parm_offset
-= hdrlen
;
588 if (parm_count
== parm_tot
&& data_count
== data_tot
) {
590 * This packet has all the trans2 data.
592 * We setup the request so that this will be the common
593 * case. It may be a server error to not return a
594 * response that fits.
596 VERBOSE("single trans2 response "
597 "dcnt=%d, pcnt=%d, doff=%d, poff=%d\n",
598 data_count
, parm_count
,
599 data_offset
, parm_offset
);
600 req
->rq_ldata
= data_count
;
601 req
->rq_lparm
= parm_count
;
602 req
->rq_data
= req
->rq_buffer
+ data_offset
;
603 req
->rq_parm
= req
->rq_buffer
+ parm_offset
;
607 VERBOSE("multi trans2 response "
608 "frag=%d, dcnt=%d, pcnt=%d, doff=%d, poff=%d\n",
610 data_count
, parm_count
,
611 data_offset
, parm_offset
);
613 if (!req
->rq_fragment
) {
616 /* We got the first trans2 fragment */
617 req
->rq_fragment
= 1;
618 req
->rq_total_data
= data_tot
;
619 req
->rq_total_parm
= parm_tot
;
623 buf_len
= data_tot
+ parm_tot
;
624 if (buf_len
> SMB_MAX_PACKET_SIZE
)
627 req
->rq_trans2bufsize
= buf_len
;
628 req
->rq_trans2buffer
= smb_kmalloc(buf_len
, GFP_NOFS
);
629 if (!req
->rq_trans2buffer
)
632 req
->rq_parm
= req
->rq_trans2buffer
;
633 req
->rq_data
= req
->rq_trans2buffer
+ parm_tot
;
634 } else if (req
->rq_total_data
< data_tot
||
635 req
->rq_total_parm
< parm_tot
)
638 if (parm_disp
+ parm_count
> req
->rq_total_parm
)
640 if (data_disp
+ data_count
> req
->rq_total_data
)
643 inbuf
= req
->rq_buffer
;
644 memcpy(req
->rq_parm
+ parm_disp
, inbuf
+ parm_offset
, parm_count
);
645 memcpy(req
->rq_data
+ data_disp
, inbuf
+ data_offset
, data_count
);
647 req
->rq_ldata
+= data_count
;
648 req
->rq_lparm
+= parm_count
;
651 * Check whether we've received all of the data. Note that
652 * we use the packet totals -- total lengths might shrink!
654 if (req
->rq_ldata
>= data_tot
&& req
->rq_lparm
>= parm_tot
)
659 printk(KERN_ERR
"smb_trans2: data/param too long, data=%d, parm=%d\n",
661 req
->rq_errno
= -EIO
;
664 printk(KERN_ERR
"smb_trans2: couldn't allocate data area of %d bytes\n",
665 req
->rq_trans2bufsize
);
666 req
->rq_errno
= -ENOMEM
;
669 printk(KERN_ERR
"smb_trans2: data/params grew!\n");
670 req
->rq_errno
= -EIO
;
673 printk(KERN_ERR
"smb_trans2: invalid parms, disp=%d, cnt=%d, tot=%d\n",
674 parm_disp
, parm_count
, parm_tot
);
675 req
->rq_errno
= -EIO
;
678 printk(KERN_ERR
"smb_trans2: invalid data, disp=%d, cnt=%d, tot=%d\n",
679 data_disp
, data_count
, data_tot
);
680 req
->rq_errno
= -EIO
;
682 return req
->rq_errno
;
686 * State machine for receiving responses. We handle the fact that we can't
687 * read the full response in one try by having states telling us how much we
690 * Must be called with the server lock held (only called from smbiod).
692 * Return: <0 on error
694 int smb_request_recv(struct smb_sb_info
*server
)
696 struct smb_request
*req
= NULL
;
699 if (smb_recv_available(server
) <= 0)
702 VERBOSE("state: %d\n", server
->rstate
);
703 switch (server
->rstate
) {
705 result
= smb_receive_drop(server
);
708 if (server
->rstate
== SMB_RECV_DROP
)
710 server
->rstate
= SMB_RECV_START
;
713 server
->smb_read
= 0;
714 server
->rstate
= SMB_RECV_HEADER
;
716 case SMB_RECV_HEADER
:
717 result
= smb_receive_header(server
);
720 if (server
->rstate
== SMB_RECV_HEADER
)
722 if (! (*(server
->header
+ smb_flg
) & SMB_FLAGS_REPLY
) ) {
723 server
->rstate
= SMB_RECV_REQUEST
;
726 if (server
->rstate
!= SMB_RECV_HCOMPLETE
)
729 case SMB_RECV_HCOMPLETE
:
730 req
= find_request(server
, WVAL(server
->header
, smb_mid
));
733 smb_init_request(server
, req
);
734 req
->rq_rcls
= *(req
->rq_header
+ smb_rcls
);
735 req
->rq_err
= WVAL(req
->rq_header
, smb_err
);
736 if (server
->rstate
!= SMB_RECV_PARAM
)
741 req
= find_request(server
,WVAL(server
->header
,smb_mid
));
744 result
= smb_recv_param(server
, req
);
747 if (server
->rstate
!= SMB_RECV_DATA
)
752 req
= find_request(server
,WVAL(server
->header
,smb_mid
));
755 result
= smb_recv_data(server
, req
);
760 /* We should never be called with any of these states */
762 case SMB_RECV_REQUEST
:
763 server
->rstate
= SMB_RECV_END
;
768 /* We saw an error */
772 if (server
->rstate
!= SMB_RECV_END
)
776 if (req
->rq_trans2_command
&& req
->rq_rcls
== SUCCESS
)
777 result
= smb_recv_trans2(server
, req
);
780 * Response completely read. Drop any extra bytes sent by the server.
781 * (Yes, servers sometimes add extra bytes to responses)
783 VERBOSE("smb_len: %d smb_read: %d\n",
784 server
->smb_len
, server
->smb_read
);
785 if (server
->smb_read
< server
->smb_len
)
786 smb_receive_drop(server
);
788 server
->rstate
= SMB_RECV_START
;
791 list_del_init(&req
->rq_queue
);
792 req
->rq_flags
|= SMB_REQ_RECEIVED
;
794 wake_up_interruptible(&req
->rq_wait
);