4 * Copyright (C) International Business Machines Corp., 2002,2009
5 * Author(s): Steve French (sfrench@us.ibm.com)
7 * This library is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU Lesser General Public License as published
9 * by the Free Software Foundation; either version 2.1 of the License, or
10 * (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
15 * the GNU Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public License
18 * along with this library; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 #include <linux/net.h>
23 #include <linux/string.h>
24 #include <linux/list.h>
25 #include <linux/wait.h>
26 #include <linux/slab.h>
27 #include <linux/pagemap.h>
28 #include <linux/ctype.h>
29 #include <linux/utsname.h>
30 #include <linux/mempool.h>
31 #include <linux/delay.h>
32 #include <linux/completion.h>
33 #include <linux/kthread.h>
34 #include <linux/pagevec.h>
35 #include <linux/freezer.h>
36 #include <linux/namei.h>
37 #include <asm/uaccess.h>
38 #include <asm/processor.h>
39 #include <linux/inet.h>
40 #include <linux/module.h>
44 #include "cifsproto.h"
45 #include "cifs_unicode.h"
46 #include "cifs_debug.h"
47 #include "cifs_fs_sb.h"
50 #include "rfc1002pdu.h"
54 #define RFC1001_PORT 139
56 /* SMB echo "timeout" -- FIXME: tunable? */
57 #define SMB_ECHO_INTERVAL (60 * HZ)
59 extern mempool_t *cifs_req_poolp;
61 /* FIXME: should these be tunable? */
62 #define TLINK_ERROR_EXPIRE (1 * HZ)
63 #define TLINK_IDLE_EXPIRE (600 * HZ)
65 static int ip_connect(struct TCP_Server_Info *server);
66 static int generic_ip_connect(struct TCP_Server_Info *server);
67 static void tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink);
68 static void cifs_prune_tlinks(struct work_struct *work);
69 static int cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
73 * cifs tcp session reconnection
75 * mark tcp session as reconnecting so temporarily locked
76 * mark all smb sessions as reconnecting for tcp session
77 * reconnect tcp session
78 * wake up waiters on reconnection? - (not needed currently)
81 cifs_reconnect(struct TCP_Server_Info *server)
84 struct list_head *tmp, *tmp2;
86 struct cifs_tcon *tcon;
87 struct mid_q_entry *mid_entry;
88 struct list_head retry_list;
90 spin_lock(&GlobalMid_Lock);
91 if (server->tcpStatus == CifsExiting) {
92 /* the demux thread will exit normally
93 next time through the loop */
94 spin_unlock(&GlobalMid_Lock);
97 server->tcpStatus = CifsNeedReconnect;
98 spin_unlock(&GlobalMid_Lock);
101 cFYI(1, "Reconnecting tcp session");
103 /* before reconnecting the tcp session, mark the smb session (uid)
104 and the tid bad so they are not used until reconnected */
105 cFYI(1, "%s: marking sessions and tcons for reconnect", __func__);
106 spin_lock(&cifs_tcp_ses_lock);
107 list_for_each(tmp, &server->smb_ses_list) {
108 ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
109 ses->need_reconnect = true;
111 list_for_each(tmp2, &ses->tcon_list) {
112 tcon = list_entry(tmp2, struct cifs_tcon, tcon_list);
113 tcon->need_reconnect = true;
116 spin_unlock(&cifs_tcp_ses_lock);
118 /* do not want to be sending data on a socket we are freeing */
119 cFYI(1, "%s: tearing down socket", __func__);
120 mutex_lock(&server->srv_mutex);
121 if (server->ssocket) {
122 cFYI(1, "State: 0x%x Flags: 0x%lx", server->ssocket->state,
123 server->ssocket->flags);
124 kernel_sock_shutdown(server->ssocket, SHUT_WR);
125 cFYI(1, "Post shutdown state: 0x%x Flags: 0x%lx",
126 server->ssocket->state,
127 server->ssocket->flags);
128 sock_release(server->ssocket);
129 server->ssocket = NULL;
131 server->sequence_number = 0;
132 server->session_estab = false;
133 kfree(server->session_key.response);
134 server->session_key.response = NULL;
135 server->session_key.len = 0;
136 server->lstrp = jiffies;
137 mutex_unlock(&server->srv_mutex);
139 /* mark submitted MIDs for retry and issue callback */
140 INIT_LIST_HEAD(&retry_list);
141 cFYI(1, "%s: moving mids to private list", __func__);
142 spin_lock(&GlobalMid_Lock);
143 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
144 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
145 if (mid_entry->midState == MID_REQUEST_SUBMITTED)
146 mid_entry->midState = MID_RETRY_NEEDED;
147 list_move(&mid_entry->qhead, &retry_list);
149 spin_unlock(&GlobalMid_Lock);
151 cFYI(1, "%s: issuing mid callbacks", __func__);
152 list_for_each_safe(tmp, tmp2, &retry_list) {
153 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
154 list_del_init(&mid_entry->qhead);
155 mid_entry->callback(mid_entry);
161 /* we should try only the port we connected to before */
162 rc = generic_ip_connect(server);
164 cFYI(1, "reconnect error %d", rc);
167 atomic_inc(&tcpSesReconnectCount);
168 spin_lock(&GlobalMid_Lock);
169 if (server->tcpStatus != CifsExiting)
170 server->tcpStatus = CifsNeedNegotiate;
171 spin_unlock(&GlobalMid_Lock);
173 } while (server->tcpStatus == CifsNeedReconnect);
180 0 not a transact2, or all data present
181 >0 transact2 with that much data missing
182 -EINVAL = invalid transact2
185 static int check2ndT2(struct smb_hdr *pSMB)
187 struct smb_t2_rsp *pSMBt;
189 __u16 total_data_size, data_in_this_rsp;
191 if (pSMB->Command != SMB_COM_TRANSACTION2)
194 /* check for plausible wct, bcc and t2 data and parm sizes */
195 /* check for parm and data offset going beyond end of smb */
196 if (pSMB->WordCount != 10) { /* coalesce_t2 depends on this */
197 cFYI(1, "invalid transact2 word count");
201 pSMBt = (struct smb_t2_rsp *)pSMB;
203 total_data_size = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount);
204 data_in_this_rsp = get_unaligned_le16(&pSMBt->t2_rsp.DataCount);
206 if (total_data_size == data_in_this_rsp)
208 else if (total_data_size < data_in_this_rsp) {
209 cFYI(1, "total data %d smaller than data in frame %d",
210 total_data_size, data_in_this_rsp);
214 remaining = total_data_size - data_in_this_rsp;
216 cFYI(1, "missing %d bytes from transact2, check next response",
218 if (total_data_size > CIFSMaxBufSize) {
219 cERROR(1, "TotalDataSize %d is over maximum buffer %d",
220 total_data_size, CIFSMaxBufSize);
226 static int coalesce_t2(struct smb_hdr *psecond, struct smb_hdr *pTargetSMB)
228 struct smb_t2_rsp *pSMBs = (struct smb_t2_rsp *)psecond;
229 struct smb_t2_rsp *pSMBt = (struct smb_t2_rsp *)pTargetSMB;
230 char *data_area_of_tgt;
231 char *data_area_of_src;
233 unsigned int byte_count, total_in_tgt;
234 __u16 tgt_total_cnt, src_total_cnt, total_in_src;
236 src_total_cnt = get_unaligned_le16(&pSMBs->t2_rsp.TotalDataCount);
237 tgt_total_cnt = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount);
239 if (tgt_total_cnt != src_total_cnt)
240 cFYI(1, "total data count of primary and secondary t2 differ "
241 "source=%hu target=%hu", src_total_cnt, tgt_total_cnt);
243 total_in_tgt = get_unaligned_le16(&pSMBt->t2_rsp.DataCount);
245 remaining = tgt_total_cnt - total_in_tgt;
248 cFYI(1, "Server sent too much data. tgt_total_cnt=%hu "
249 "total_in_tgt=%hu", tgt_total_cnt, total_in_tgt);
253 if (remaining == 0) {
254 /* nothing to do, ignore */
255 cFYI(1, "no more data remains");
259 total_in_src = get_unaligned_le16(&pSMBs->t2_rsp.DataCount);
260 if (remaining < total_in_src)
261 cFYI(1, "transact2 2nd response contains too much data");
263 /* find end of first SMB data area */
264 data_area_of_tgt = (char *)&pSMBt->hdr.Protocol +
265 get_unaligned_le16(&pSMBt->t2_rsp.DataOffset);
267 /* validate target area */
268 data_area_of_src = (char *)&pSMBs->hdr.Protocol +
269 get_unaligned_le16(&pSMBs->t2_rsp.DataOffset);
271 data_area_of_tgt += total_in_tgt;
273 total_in_tgt += total_in_src;
274 /* is the result too big for the field? */
275 if (total_in_tgt > USHRT_MAX) {
276 cFYI(1, "coalesced DataCount too large (%u)", total_in_tgt);
279 put_unaligned_le16(total_in_tgt, &pSMBt->t2_rsp.DataCount);
282 byte_count = get_bcc(pTargetSMB);
283 byte_count += total_in_src;
284 /* is the result too big for the field? */
285 if (byte_count > USHRT_MAX) {
286 cFYI(1, "coalesced BCC too large (%u)", byte_count);
289 put_bcc(byte_count, pTargetSMB);
291 byte_count = be32_to_cpu(pTargetSMB->smb_buf_length);
292 byte_count += total_in_src;
293 /* don't allow buffer to overflow */
294 if (byte_count > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {
295 cFYI(1, "coalesced BCC exceeds buffer size (%u)", byte_count);
298 pTargetSMB->smb_buf_length = cpu_to_be32(byte_count);
300 /* copy second buffer into end of first buffer */
301 memcpy(data_area_of_tgt, data_area_of_src, total_in_src);
303 if (remaining != total_in_src) {
304 /* more responses to go */
305 cFYI(1, "waiting for more secondary responses");
310 cFYI(1, "found the last secondary response");
315 cifs_echo_request(struct work_struct *work)
318 struct TCP_Server_Info *server = container_of(work,
319 struct TCP_Server_Info, echo.work);
322 * We cannot send an echo until the NEGOTIATE_PROTOCOL request is
323 * done, which is indicated by maxBuf != 0. Also, no need to ping if
324 * we got a response recently
326 if (server->maxBuf == 0 ||
327 time_before(jiffies, server->lstrp + SMB_ECHO_INTERVAL - HZ))
330 rc = CIFSSMBEcho(server);
332 cFYI(1, "Unable to send echo request to server: %s",
336 queue_delayed_work(system_nrt_wq, &server->echo, SMB_ECHO_INTERVAL);
340 allocate_buffers(struct TCP_Server_Info *server)
342 if (!server->bigbuf) {
343 server->bigbuf = (char *)cifs_buf_get();
344 if (!server->bigbuf) {
345 cERROR(1, "No memory for large SMB response");
347 /* retry will check if exiting */
350 } else if (server->large_buf) {
351 /* we are reusing a dirty large buf, clear its start */
352 memset(server->bigbuf, 0, sizeof(struct smb_hdr));
355 if (!server->smallbuf) {
356 server->smallbuf = (char *)cifs_small_buf_get();
357 if (!server->smallbuf) {
358 cERROR(1, "No memory for SMB response");
360 /* retry will check if exiting */
363 /* beginning of smb buffer is cleared in our buf_get */
365 /* if existing small buf clear beginning */
366 memset(server->smallbuf, 0, sizeof(struct smb_hdr));
373 server_unresponsive(struct TCP_Server_Info *server)
375 if (echo_retries > 0 && server->tcpStatus == CifsGood &&
376 time_after(jiffies, server->lstrp +
377 (echo_retries * SMB_ECHO_INTERVAL))) {
378 cERROR(1, "Server %s has not responded in %d seconds. "
379 "Reconnecting...", server->hostname,
380 (echo_retries * SMB_ECHO_INTERVAL / HZ));
381 cifs_reconnect(server);
382 wake_up(&server->response_q);
390 * kvec_array_init - clone a kvec array, and advance into it
391 * @new: pointer to memory for cloned array
392 * @iov: pointer to original array
393 * @nr_segs: number of members in original array
394 * @bytes: number of bytes to advance into the cloned array
396 * This function will copy the array provided in iov to a section of memory
397 * and advance the specified number of bytes into the new array. It returns
398 * the number of segments in the new array. "new" must be at least as big as
399 * the original iov array.
402 kvec_array_init(struct kvec *new, struct kvec *iov, unsigned int nr_segs,
407 while (bytes || !iov->iov_len) {
408 int copy = min(bytes, iov->iov_len);
412 if (iov->iov_len == base) {
418 memcpy(new, iov, sizeof(*iov) * nr_segs);
419 new->iov_base += base;
420 new->iov_len -= base;
425 get_server_iovec(struct TCP_Server_Info *server, unsigned int nr_segs)
427 struct kvec *new_iov;
429 if (server->iov && nr_segs <= server->nr_iov)
432 /* not big enough -- allocate a new one and release the old */
433 new_iov = kmalloc(sizeof(*new_iov) * nr_segs, GFP_NOFS);
436 server->iov = new_iov;
437 server->nr_iov = nr_segs;
443 cifs_readv_from_socket(struct TCP_Server_Info *server, struct kvec *iov_orig,
444 unsigned int nr_segs, unsigned int to_read)
449 struct msghdr smb_msg;
452 iov = get_server_iovec(server, nr_segs);
456 smb_msg.msg_control = NULL;
457 smb_msg.msg_controllen = 0;
459 for (total_read = 0; to_read; total_read += length, to_read -= length) {
462 if (server_unresponsive(server)) {
463 total_read = -EAGAIN;
467 segs = kvec_array_init(iov, iov_orig, nr_segs, total_read);
469 length = kernel_recvmsg(server->ssocket, &smb_msg,
470 iov, segs, to_read, 0);
472 if (server->tcpStatus == CifsExiting) {
473 total_read = -ESHUTDOWN;
475 } else if (server->tcpStatus == CifsNeedReconnect) {
476 cifs_reconnect(server);
477 total_read = -EAGAIN;
479 } else if (length == -ERESTARTSYS ||
483 * Minimum sleep to prevent looping, allowing socket
484 * to clear and app threads to set tcpStatus
485 * CifsNeedReconnect if server hung.
487 usleep_range(1000, 2000);
490 } else if (length <= 0) {
491 cFYI(1, "Received no data or error: expecting %d "
492 "got %d", to_read, length);
493 cifs_reconnect(server);
494 total_read = -EAGAIN;
502 cifs_read_from_socket(struct TCP_Server_Info *server, char *buf,
503 unsigned int to_read)
508 iov.iov_len = to_read;
510 return cifs_readv_from_socket(server, &iov, 1, to_read);
514 is_smb_response(struct TCP_Server_Info *server, unsigned char type)
517 * The first byte big endian of the length field,
518 * is actually not part of the length but the type
519 * with the most common, zero, as regular data.
522 case RFC1002_SESSION_MESSAGE:
523 /* Regular SMB response */
525 case RFC1002_SESSION_KEEP_ALIVE:
526 cFYI(1, "RFC 1002 session keep alive");
528 case RFC1002_POSITIVE_SESSION_RESPONSE:
529 cFYI(1, "RFC 1002 positive session response");
531 case RFC1002_NEGATIVE_SESSION_RESPONSE:
533 * We get this from Windows 98 instead of an error on
534 * SMB negprot response.
536 cFYI(1, "RFC 1002 negative session response");
537 /* give server a second to clean up */
540 * Always try 445 first on reconnect since we get NACK
541 * on some if we ever connected to port 139 (the NACK
542 * is since we do not begin with RFC1001 session
545 cifs_set_port((struct sockaddr *)&server->dstaddr, CIFS_PORT);
546 cifs_reconnect(server);
547 wake_up(&server->response_q);
550 cERROR(1, "RFC 1002 unknown response type 0x%x", type);
551 cifs_reconnect(server);
557 static struct mid_q_entry *
558 find_mid(struct TCP_Server_Info *server, struct smb_hdr *buf)
560 struct mid_q_entry *mid;
562 spin_lock(&GlobalMid_Lock);
563 list_for_each_entry(mid, &server->pending_mid_q, qhead) {
564 if (mid->mid == buf->Mid &&
565 mid->midState == MID_REQUEST_SUBMITTED &&
566 mid->command == buf->Command) {
567 spin_unlock(&GlobalMid_Lock);
571 spin_unlock(&GlobalMid_Lock);
576 dequeue_mid(struct mid_q_entry *mid, bool malformed)
578 #ifdef CONFIG_CIFS_STATS2
579 mid->when_received = jiffies;
581 spin_lock(&GlobalMid_Lock);
583 mid->midState = MID_RESPONSE_RECEIVED;
585 mid->midState = MID_RESPONSE_MALFORMED;
586 list_del_init(&mid->qhead);
587 spin_unlock(&GlobalMid_Lock);
591 handle_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server,
592 struct smb_hdr *buf, int malformed)
594 if (malformed == 0 && check2ndT2(buf) > 0) {
595 mid->multiRsp = true;
597 /* merge response - fix up 1st*/
598 malformed = coalesce_t2(buf, mid->resp_buf);
602 /* All parts received or packet is malformed. */
603 mid->multiEnd = true;
604 return dequeue_mid(mid, malformed);
606 if (!server->large_buf) {
607 /*FIXME: switch to already allocated largebuf?*/
608 cERROR(1, "1st trans2 resp needs bigbuf");
610 /* Have first buffer */
612 mid->largeBuf = true;
613 server->bigbuf = NULL;
618 mid->largeBuf = server->large_buf;
619 /* Was previous buf put in mpx struct for multi-rsp? */
620 if (!mid->multiRsp) {
621 /* smb buffer will be freed by user thread */
622 if (server->large_buf)
623 server->bigbuf = NULL;
625 server->smallbuf = NULL;
627 dequeue_mid(mid, malformed);
630 static void clean_demultiplex_info(struct TCP_Server_Info *server)
634 /* take it off the list, if it's not already */
635 spin_lock(&cifs_tcp_ses_lock);
636 list_del_init(&server->tcp_ses_list);
637 spin_unlock(&cifs_tcp_ses_lock);
639 spin_lock(&GlobalMid_Lock);
640 server->tcpStatus = CifsExiting;
641 spin_unlock(&GlobalMid_Lock);
642 wake_up_all(&server->response_q);
645 * Check if we have blocked requests that need to free. Note that
646 * cifs_max_pending is normally 50, but can be set at module install
647 * time to as little as two.
649 spin_lock(&GlobalMid_Lock);
650 if (atomic_read(&server->inFlight) >= cifs_max_pending)
651 atomic_set(&server->inFlight, cifs_max_pending - 1);
653 * We do not want to set the max_pending too low or we could end up
654 * with the counter going negative.
656 spin_unlock(&GlobalMid_Lock);
658 * Although there should not be any requests blocked on this queue it
659 * can not hurt to be paranoid and try to wake up requests that may
660 * haven been blocked when more than 50 at time were on the wire to the
661 * same server - they now will see the session is in exit state and get
662 * out of SendReceive.
664 wake_up_all(&server->request_q);
665 /* give those requests time to exit */
668 if (server->ssocket) {
669 sock_release(server->ssocket);
670 server->ssocket = NULL;
673 if (!list_empty(&server->pending_mid_q)) {
674 struct list_head dispose_list;
675 struct mid_q_entry *mid_entry;
676 struct list_head *tmp, *tmp2;
678 INIT_LIST_HEAD(&dispose_list);
679 spin_lock(&GlobalMid_Lock);
680 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
681 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
682 cFYI(1, "Clearing mid 0x%x", mid_entry->mid);
683 mid_entry->midState = MID_SHUTDOWN;
684 list_move(&mid_entry->qhead, &dispose_list);
686 spin_unlock(&GlobalMid_Lock);
688 /* now walk dispose list and issue callbacks */
689 list_for_each_safe(tmp, tmp2, &dispose_list) {
690 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
691 cFYI(1, "Callback mid 0x%x", mid_entry->mid);
692 list_del_init(&mid_entry->qhead);
693 mid_entry->callback(mid_entry);
695 /* 1/8th of sec is more than enough time for them to exit */
699 if (!list_empty(&server->pending_mid_q)) {
701 * mpx threads have not exited yet give them at least the smb
702 * send timeout time for long ops.
704 * Due to delays on oplock break requests, we need to wait at
705 * least 45 seconds before giving up on a request getting a
706 * response and going ahead and killing cifsd.
708 cFYI(1, "Wait for exit from demultiplex thread");
711 * If threads still have not exited they are probably never
712 * coming home not much else we can do but free the memory.
716 kfree(server->hostname);
720 length = atomic_dec_return(&tcpSesAllocCount);
722 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
727 standard_receive3(struct TCP_Server_Info *server, struct mid_q_entry *mid)
730 char *buf = server->smallbuf;
731 struct smb_hdr *smb_buffer = (struct smb_hdr *)buf;
732 unsigned int pdu_length = be32_to_cpu(smb_buffer->smb_buf_length);
734 /* make sure this will fit in a large buffer */
735 if (pdu_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {
736 cERROR(1, "SMB response too long (%u bytes)",
738 cifs_reconnect(server);
739 wake_up(&server->response_q);
743 /* switch to large buffer if too big for a small one */
744 if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
745 server->large_buf = true;
746 memcpy(server->bigbuf, server->smallbuf, server->total_read);
747 buf = server->bigbuf;
748 smb_buffer = (struct smb_hdr *)buf;
751 /* now read the rest */
752 length = cifs_read_from_socket(server,
753 buf + sizeof(struct smb_hdr) - 1,
754 pdu_length - sizeof(struct smb_hdr) + 1 + 4);
757 server->total_read += length;
759 dump_smb(smb_buffer, server->total_read);
762 * We know that we received enough to get to the MID as we
763 * checked the pdu_length earlier. Now check to see
764 * if the rest of the header is OK. We borrow the length
765 * var for the rest of the loop to avoid a new stack var.
767 * 48 bytes is enough to display the header and a little bit
768 * into the payload for debugging purposes.
770 length = checkSMB(smb_buffer, smb_buffer->Mid, server->total_read);
772 cifs_dump_mem("Bad SMB: ", buf,
773 min_t(unsigned int, server->total_read, 48));
776 handle_mid(mid, server, smb_buffer, length);
782 cifs_demultiplex_thread(void *p)
785 struct TCP_Server_Info *server = p;
786 unsigned int pdu_length;
788 struct smb_hdr *smb_buffer = NULL;
789 struct task_struct *task_to_wake = NULL;
790 struct mid_q_entry *mid_entry;
792 current->flags |= PF_MEMALLOC;
793 cFYI(1, "Demultiplex PID: %d", task_pid_nr(current));
795 length = atomic_inc_return(&tcpSesAllocCount);
797 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
801 while (server->tcpStatus != CifsExiting) {
805 if (!allocate_buffers(server))
808 server->large_buf = false;
809 smb_buffer = (struct smb_hdr *)server->smallbuf;
810 buf = server->smallbuf;
811 pdu_length = 4; /* enough to get RFC1001 header */
813 length = cifs_read_from_socket(server, buf, pdu_length);
816 server->total_read = length;
819 * The right amount was read from socket - 4 bytes,
820 * so we can now interpret the length field.
822 pdu_length = be32_to_cpu(smb_buffer->smb_buf_length);
824 cFYI(1, "RFC1002 header 0x%x", pdu_length);
825 if (!is_smb_response(server, buf[0]))
828 /* make sure we have enough to get to the MID */
829 if (pdu_length < sizeof(struct smb_hdr) - 1 - 4) {
830 cERROR(1, "SMB response too short (%u bytes)",
832 cifs_reconnect(server);
833 wake_up(&server->response_q);
837 /* read down to the MID */
838 length = cifs_read_from_socket(server, buf + 4,
839 sizeof(struct smb_hdr) - 1 - 4);
842 server->total_read += length;
844 mid_entry = find_mid(server, smb_buffer);
846 if (!mid_entry || !mid_entry->receive)
847 length = standard_receive3(server, mid_entry);
849 length = mid_entry->receive(server, mid_entry);
854 if (server->large_buf) {
855 buf = server->bigbuf;
856 smb_buffer = (struct smb_hdr *)buf;
859 server->lstrp = jiffies;
860 if (mid_entry != NULL) {
861 if (!mid_entry->multiRsp || mid_entry->multiEnd)
862 mid_entry->callback(mid_entry);
863 } else if (!is_valid_oplock_break(smb_buffer, server)) {
864 cERROR(1, "No task to wake, unknown frame received! "
865 "NumMids %d", atomic_read(&midCount));
866 cifs_dump_mem("Received Data is: ", buf,
867 sizeof(struct smb_hdr));
868 #ifdef CONFIG_CIFS_DEBUG2
869 cifs_dump_detail(smb_buffer);
870 cifs_dump_mids(server);
871 #endif /* CIFS_DEBUG2 */
874 } /* end while !EXITING */
876 /* buffer usually freed in free_mid - need to free it here on exit */
877 cifs_buf_release(server->bigbuf);
878 if (server->smallbuf) /* no sense logging a debug message if NULL */
879 cifs_small_buf_release(server->smallbuf);
881 task_to_wake = xchg(&server->tsk, NULL);
882 clean_demultiplex_info(server);
884 /* if server->tsk was NULL then wait for a signal before exiting */
886 set_current_state(TASK_INTERRUPTIBLE);
887 while (!signal_pending(current)) {
889 set_current_state(TASK_INTERRUPTIBLE);
891 set_current_state(TASK_RUNNING);
894 module_put_and_exit(0);
897 /* extract the host portion of the UNC string */
899 extract_hostname(const char *unc)
905 /* skip double chars at beginning of string */
906 /* BB: check validity of these bytes? */
909 /* delimiter between hostname and sharename is always '\\' now */
910 delim = strchr(src, '\\');
912 return ERR_PTR(-EINVAL);
915 dst = kmalloc((len + 1), GFP_KERNEL);
917 return ERR_PTR(-ENOMEM);
919 memcpy(dst, src, len);
926 cifs_parse_mount_options(const char *mountdata, const char *devname,
929 char *value, *data, *end;
930 char *mountdata_copy = NULL, *options;
932 unsigned int temp_len, i, j;
934 short int override_uid = -1;
935 short int override_gid = -1;
936 bool uid_specified = false;
937 bool gid_specified = false;
938 char *nodename = utsname()->nodename;
944 * does not have to be perfect mapping since field is
945 * informational, only used for servers that do not support
946 * port 445 and it can be overridden at mount time
948 memset(vol->source_rfc1001_name, 0x20, RFC1001_NAME_LEN);
949 for (i = 0; i < strnlen(nodename, RFC1001_NAME_LEN); i++)
950 vol->source_rfc1001_name[i] = toupper(nodename[i]);
952 vol->source_rfc1001_name[RFC1001_NAME_LEN] = 0;
953 /* null target name indicates to use *SMBSERVR default called name
954 if we end up sending RFC1001 session initialize */
955 vol->target_rfc1001_name[0] = 0;
956 vol->cred_uid = current_uid();
957 vol->linux_uid = current_uid();
958 vol->linux_gid = current_gid();
960 /* default to only allowing write access to owner of the mount */
961 vol->dir_mode = vol->file_mode = S_IRUGO | S_IXUGO | S_IWUSR;
963 /* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */
964 /* default is always to request posix paths. */
965 vol->posix_paths = 1;
966 /* default to using server inode numbers where available */
969 vol->actimeo = CIFS_DEF_ACTIMEO;
972 goto cifs_parse_mount_err;
974 mountdata_copy = kstrndup(mountdata, PAGE_SIZE, GFP_KERNEL);
976 goto cifs_parse_mount_err;
978 options = mountdata_copy;
979 end = options + strlen(options);
980 if (strncmp(options, "sep=", 4) == 0) {
981 if (options[4] != 0) {
982 separator[0] = options[4];
985 cFYI(1, "Null separator not allowed");
988 vol->backupuid_specified = false; /* no backup intent for a user */
989 vol->backupgid_specified = false; /* no backup intent for a group */
991 while ((data = strsep(&options, separator)) != NULL) {
994 if ((value = strchr(data, '=')) != NULL)
997 /* Have to parse this before we parse for "user" */
998 if (strnicmp(data, "user_xattr", 10) == 0) {
1000 } else if (strnicmp(data, "nouser_xattr", 12) == 0) {
1002 } else if (strnicmp(data, "user", 4) == 0) {
1005 "CIFS: invalid or missing username\n");
1006 goto cifs_parse_mount_err;
1007 } else if (!*value) {
1008 /* null user, ie anonymous, authentication */
1011 if (strnlen(value, MAX_USERNAME_SIZE) <
1012 MAX_USERNAME_SIZE) {
1013 vol->username = kstrdup(value, GFP_KERNEL);
1014 if (!vol->username) {
1015 printk(KERN_WARNING "CIFS: no memory "
1017 goto cifs_parse_mount_err;
1020 printk(KERN_WARNING "CIFS: username too long\n");
1021 goto cifs_parse_mount_err;
1023 } else if (strnicmp(data, "pass", 4) == 0) {
1025 vol->password = NULL;
1027 } else if (value[0] == 0) {
1028 /* check if string begins with double comma
1029 since that would mean the password really
1030 does start with a comma, and would not
1031 indicate an empty string */
1032 if (value[1] != separator[0]) {
1033 vol->password = NULL;
1037 temp_len = strlen(value);
1038 /* removed password length check, NTLM passwords
1039 can be arbitrarily long */
1041 /* if comma in password, the string will be
1042 prematurely null terminated. Commas in password are
1043 specified across the cifs mount interface by a double
1044 comma ie ,, and a comma used as in other cases ie ','
1045 as a parameter delimiter/separator is single and due
1046 to the strsep above is temporarily zeroed. */
1048 /* NB: password legally can have multiple commas and
1049 the only illegal character in a password is null */
1051 if ((value[temp_len] == 0) &&
1052 (value + temp_len < end) &&
1053 (value[temp_len+1] == separator[0])) {
1054 /* reinsert comma */
1055 value[temp_len] = separator[0];
1056 temp_len += 2; /* move after second comma */
1057 while (value[temp_len] != 0) {
1058 if (value[temp_len] == separator[0]) {
1059 if (value[temp_len+1] ==
1061 /* skip second comma */
1064 /* single comma indicating start
1071 if (value[temp_len] == 0) {
1074 value[temp_len] = 0;
1075 /* point option to start of next parm */
1076 options = value + temp_len + 1;
1078 /* go from value to value + temp_len condensing
1079 double commas to singles. Note that this ends up
1080 allocating a few bytes too many, which is ok */
1081 vol->password = kzalloc(temp_len, GFP_KERNEL);
1082 if (vol->password == NULL) {
1083 printk(KERN_WARNING "CIFS: no memory "
1085 goto cifs_parse_mount_err;
1087 for (i = 0, j = 0; i < temp_len; i++, j++) {
1088 vol->password[j] = value[i];
1089 if (value[i] == separator[0]
1090 && value[i+1] == separator[0]) {
1091 /* skip second comma */
1095 vol->password[j] = 0;
1097 vol->password = kzalloc(temp_len+1, GFP_KERNEL);
1098 if (vol->password == NULL) {
1099 printk(KERN_WARNING "CIFS: no memory "
1101 goto cifs_parse_mount_err;
1103 strcpy(vol->password, value);
1105 } else if (!strnicmp(data, "ip", 2) ||
1106 !strnicmp(data, "addr", 4)) {
1107 if (!value || !*value) {
1109 } else if (strnlen(value, INET6_ADDRSTRLEN) <
1111 vol->UNCip = kstrdup(value, GFP_KERNEL);
1113 printk(KERN_WARNING "CIFS: no memory "
1115 goto cifs_parse_mount_err;
1118 printk(KERN_WARNING "CIFS: ip address "
1120 goto cifs_parse_mount_err;
1122 } else if (strnicmp(data, "sec", 3) == 0) {
1123 if (!value || !*value) {
1124 cERROR(1, "no security value specified");
1126 } else if (strnicmp(value, "krb5i", 5) == 0) {
1127 vol->secFlg |= CIFSSEC_MAY_KRB5 |
1129 } else if (strnicmp(value, "krb5p", 5) == 0) {
1130 /* vol->secFlg |= CIFSSEC_MUST_SEAL |
1131 CIFSSEC_MAY_KRB5; */
1132 cERROR(1, "Krb5 cifs privacy not supported");
1133 goto cifs_parse_mount_err;
1134 } else if (strnicmp(value, "krb5", 4) == 0) {
1135 vol->secFlg |= CIFSSEC_MAY_KRB5;
1136 } else if (strnicmp(value, "ntlmsspi", 8) == 0) {
1137 vol->secFlg |= CIFSSEC_MAY_NTLMSSP |
1139 } else if (strnicmp(value, "ntlmssp", 7) == 0) {
1140 vol->secFlg |= CIFSSEC_MAY_NTLMSSP;
1141 } else if (strnicmp(value, "ntlmv2i", 7) == 0) {
1142 vol->secFlg |= CIFSSEC_MAY_NTLMV2 |
1144 } else if (strnicmp(value, "ntlmv2", 6) == 0) {
1145 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
1146 } else if (strnicmp(value, "ntlmi", 5) == 0) {
1147 vol->secFlg |= CIFSSEC_MAY_NTLM |
1149 } else if (strnicmp(value, "ntlm", 4) == 0) {
1150 /* ntlm is default so can be turned off too */
1151 vol->secFlg |= CIFSSEC_MAY_NTLM;
1152 } else if (strnicmp(value, "nontlm", 6) == 0) {
1153 /* BB is there a better way to do this? */
1154 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
1155 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1156 } else if (strnicmp(value, "lanman", 6) == 0) {
1157 vol->secFlg |= CIFSSEC_MAY_LANMAN;
1159 } else if (strnicmp(value, "none", 4) == 0) {
1162 cERROR(1, "bad security option: %s", value);
1163 goto cifs_parse_mount_err;
1165 } else if (strnicmp(data, "vers", 3) == 0) {
1166 if (!value || !*value) {
1167 cERROR(1, "no protocol version specified"
1168 " after vers= mount option");
1169 } else if ((strnicmp(value, "cifs", 4) == 0) ||
1170 (strnicmp(value, "1", 1) == 0)) {
1171 /* this is the default */
1174 } else if ((strnicmp(data, "unc", 3) == 0)
1175 || (strnicmp(data, "target", 6) == 0)
1176 || (strnicmp(data, "path", 4) == 0)) {
1177 if (!value || !*value) {
1178 printk(KERN_WARNING "CIFS: invalid path to "
1179 "network resource\n");
1180 goto cifs_parse_mount_err;
1182 if ((temp_len = strnlen(value, 300)) < 300) {
1183 vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
1184 if (vol->UNC == NULL)
1185 goto cifs_parse_mount_err;
1186 strcpy(vol->UNC, value);
1187 if (strncmp(vol->UNC, "//", 2) == 0) {
1190 } else if (strncmp(vol->UNC, "\\\\", 2) != 0) {
1192 "CIFS: UNC Path does not begin "
1193 "with // or \\\\ \n");
1194 goto cifs_parse_mount_err;
1197 printk(KERN_WARNING "CIFS: UNC name too long\n");
1198 goto cifs_parse_mount_err;
1200 } else if ((strnicmp(data, "domain", 3) == 0)
1201 || (strnicmp(data, "workgroup", 5) == 0)) {
1202 if (!value || !*value) {
1203 printk(KERN_WARNING "CIFS: invalid domain name\n");
1204 goto cifs_parse_mount_err;
1206 /* BB are there cases in which a comma can be valid in
1207 a domain name and need special handling? */
1208 if (strnlen(value, 256) < 256) {
1209 vol->domainname = kstrdup(value, GFP_KERNEL);
1210 if (!vol->domainname) {
1211 printk(KERN_WARNING "CIFS: no memory "
1212 "for domainname\n");
1213 goto cifs_parse_mount_err;
1215 cFYI(1, "Domain name set");
1217 printk(KERN_WARNING "CIFS: domain name too "
1219 goto cifs_parse_mount_err;
1221 } else if (strnicmp(data, "srcaddr", 7) == 0) {
1222 vol->srcaddr.ss_family = AF_UNSPEC;
1224 if (!value || !*value) {
1225 printk(KERN_WARNING "CIFS: srcaddr value"
1226 " not specified.\n");
1227 goto cifs_parse_mount_err;
1229 i = cifs_convert_address((struct sockaddr *)&vol->srcaddr,
1230 value, strlen(value));
1232 printk(KERN_WARNING "CIFS: Could not parse"
1235 goto cifs_parse_mount_err;
1237 } else if (strnicmp(data, "prefixpath", 10) == 0) {
1238 if (!value || !*value) {
1240 "CIFS: invalid path prefix\n");
1241 goto cifs_parse_mount_err;
1243 if ((temp_len = strnlen(value, 1024)) < 1024) {
1244 if (value[0] != '/')
1245 temp_len++; /* missing leading slash */
1246 vol->prepath = kmalloc(temp_len+1, GFP_KERNEL);
1247 if (vol->prepath == NULL)
1248 goto cifs_parse_mount_err;
1249 if (value[0] != '/') {
1250 vol->prepath[0] = '/';
1251 strcpy(vol->prepath+1, value);
1253 strcpy(vol->prepath, value);
1254 cFYI(1, "prefix path %s", vol->prepath);
1256 printk(KERN_WARNING "CIFS: prefix too long\n");
1257 goto cifs_parse_mount_err;
1259 } else if (strnicmp(data, "iocharset", 9) == 0) {
1260 if (!value || !*value) {
1261 printk(KERN_WARNING "CIFS: invalid iocharset "
1263 goto cifs_parse_mount_err;
1265 if (strnlen(value, 65) < 65) {
1266 if (strnicmp(value, "default", 7)) {
1267 vol->iocharset = kstrdup(value,
1270 if (!vol->iocharset) {
1271 printk(KERN_WARNING "CIFS: no "
1274 goto cifs_parse_mount_err;
1277 /* if iocharset not set then load_nls_default
1278 is used by caller */
1279 cFYI(1, "iocharset set to %s", value);
1281 printk(KERN_WARNING "CIFS: iocharset name "
1283 goto cifs_parse_mount_err;
1285 } else if (!strnicmp(data, "uid", 3) && value && *value) {
1286 vol->linux_uid = simple_strtoul(value, &value, 0);
1287 uid_specified = true;
1288 } else if (!strnicmp(data, "cruid", 5) && value && *value) {
1289 vol->cred_uid = simple_strtoul(value, &value, 0);
1290 } else if (!strnicmp(data, "forceuid", 8)) {
1292 } else if (!strnicmp(data, "noforceuid", 10)) {
1294 } else if (!strnicmp(data, "gid", 3) && value && *value) {
1295 vol->linux_gid = simple_strtoul(value, &value, 0);
1296 gid_specified = true;
1297 } else if (!strnicmp(data, "forcegid", 8)) {
1299 } else if (!strnicmp(data, "noforcegid", 10)) {
1301 } else if (strnicmp(data, "file_mode", 4) == 0) {
1302 if (value && *value) {
1304 simple_strtoul(value, &value, 0);
1306 } else if (strnicmp(data, "dir_mode", 4) == 0) {
1307 if (value && *value) {
1309 simple_strtoul(value, &value, 0);
1311 } else if (strnicmp(data, "dirmode", 4) == 0) {
1312 if (value && *value) {
1314 simple_strtoul(value, &value, 0);
1316 } else if (strnicmp(data, "port", 4) == 0) {
1317 if (value && *value) {
1319 simple_strtoul(value, &value, 0);
1321 } else if (strnicmp(data, "rsize", 5) == 0) {
1322 if (value && *value) {
1324 simple_strtoul(value, &value, 0);
1326 } else if (strnicmp(data, "wsize", 5) == 0) {
1327 if (value && *value) {
1329 simple_strtoul(value, &value, 0);
1331 } else if (strnicmp(data, "sockopt", 5) == 0) {
1332 if (!value || !*value) {
1333 cERROR(1, "no socket option specified");
1335 } else if (strnicmp(value, "TCP_NODELAY", 11) == 0) {
1336 vol->sockopt_tcp_nodelay = 1;
1338 } else if (strnicmp(data, "netbiosname", 4) == 0) {
1339 if (!value || !*value || (*value == ' ')) {
1340 cFYI(1, "invalid (empty) netbiosname");
1342 memset(vol->source_rfc1001_name, 0x20,
1345 * FIXME: are there cases in which a comma can
1346 * be valid in workstation netbios name (and
1347 * need special handling)?
1349 for (i = 0; i < RFC1001_NAME_LEN; i++) {
1350 /* don't ucase netbiosname for user */
1353 vol->source_rfc1001_name[i] = value[i];
1355 /* The string has 16th byte zero still from
1356 set at top of the function */
1357 if (i == RFC1001_NAME_LEN && value[i] != 0)
1358 printk(KERN_WARNING "CIFS: netbiosname"
1359 " longer than 15 truncated.\n");
1361 } else if (strnicmp(data, "servern", 7) == 0) {
1362 /* servernetbiosname specified override *SMBSERVER */
1363 if (!value || !*value || (*value == ' ')) {
1364 cFYI(1, "empty server netbiosname specified");
1366 /* last byte, type, is 0x20 for servr type */
1367 memset(vol->target_rfc1001_name, 0x20,
1368 RFC1001_NAME_LEN_WITH_NULL);
1370 for (i = 0; i < 15; i++) {
1371 /* BB are there cases in which a comma can be
1372 valid in this workstation netbios name
1373 (and need special handling)? */
1375 /* user or mount helper must uppercase
1380 vol->target_rfc1001_name[i] =
1383 /* The string has 16th byte zero still from
1384 set at top of the function */
1385 if (i == RFC1001_NAME_LEN && value[i] != 0)
1386 printk(KERN_WARNING "CIFS: server net"
1387 "biosname longer than 15 truncated.\n");
1389 } else if (strnicmp(data, "actimeo", 7) == 0) {
1390 if (value && *value) {
1391 vol->actimeo = HZ * simple_strtoul(value,
1393 if (vol->actimeo > CIFS_MAX_ACTIMEO) {
1394 cERROR(1, "CIFS: attribute cache"
1395 "timeout too large");
1396 goto cifs_parse_mount_err;
1399 } else if (strnicmp(data, "credentials", 4) == 0) {
1401 } else if (strnicmp(data, "version", 3) == 0) {
1403 } else if (strnicmp(data, "guest", 5) == 0) {
1405 } else if (strnicmp(data, "rw", 2) == 0 && strlen(data) == 2) {
1407 } else if (strnicmp(data, "ro", 2) == 0) {
1409 } else if (strnicmp(data, "noblocksend", 11) == 0) {
1410 vol->noblocksnd = 1;
1411 } else if (strnicmp(data, "noautotune", 10) == 0) {
1412 vol->noautotune = 1;
1413 } else if ((strnicmp(data, "suid", 4) == 0) ||
1414 (strnicmp(data, "nosuid", 6) == 0) ||
1415 (strnicmp(data, "exec", 4) == 0) ||
1416 (strnicmp(data, "noexec", 6) == 0) ||
1417 (strnicmp(data, "nodev", 5) == 0) ||
1418 (strnicmp(data, "noauto", 6) == 0) ||
1419 (strnicmp(data, "dev", 3) == 0)) {
1420 /* The mount tool or mount.cifs helper (if present)
1421 uses these opts to set flags, and the flags are read
1422 by the kernel vfs layer before we get here (ie
1423 before read super) so there is no point trying to
1424 parse these options again and set anything and it
1425 is ok to just ignore them */
1427 } else if (strnicmp(data, "hard", 4) == 0) {
1429 } else if (strnicmp(data, "soft", 4) == 0) {
1431 } else if (strnicmp(data, "perm", 4) == 0) {
1433 } else if (strnicmp(data, "noperm", 6) == 0) {
1435 } else if (strnicmp(data, "mapchars", 8) == 0) {
1437 } else if (strnicmp(data, "nomapchars", 10) == 0) {
1439 } else if (strnicmp(data, "sfu", 3) == 0) {
1441 } else if (strnicmp(data, "nosfu", 5) == 0) {
1443 } else if (strnicmp(data, "nodfs", 5) == 0) {
1445 } else if (strnicmp(data, "posixpaths", 10) == 0) {
1446 vol->posix_paths = 1;
1447 } else if (strnicmp(data, "noposixpaths", 12) == 0) {
1448 vol->posix_paths = 0;
1449 } else if (strnicmp(data, "nounix", 6) == 0) {
1450 vol->no_linux_ext = 1;
1451 } else if (strnicmp(data, "nolinux", 7) == 0) {
1452 vol->no_linux_ext = 1;
1453 } else if ((strnicmp(data, "nocase", 6) == 0) ||
1454 (strnicmp(data, "ignorecase", 10) == 0)) {
1456 } else if (strnicmp(data, "mand", 4) == 0) {
1458 } else if (strnicmp(data, "nomand", 6) == 0) {
1460 } else if (strnicmp(data, "_netdev", 7) == 0) {
1462 } else if (strnicmp(data, "brl", 3) == 0) {
1464 } else if ((strnicmp(data, "nobrl", 5) == 0) ||
1465 (strnicmp(data, "nolock", 6) == 0)) {
1467 /* turn off mandatory locking in mode
1468 if remote locking is turned off since the
1469 local vfs will do advisory */
1470 if (vol->file_mode ==
1471 (S_IALLUGO & ~(S_ISUID | S_IXGRP)))
1472 vol->file_mode = S_IALLUGO;
1473 } else if (strnicmp(data, "forcemandatorylock", 9) == 0) {
1474 /* will take the shorter form "forcemand" as well */
1475 /* This mount option will force use of mandatory
1476 (DOS/Windows style) byte range locks, instead of
1477 using posix advisory byte range locks, even if the
1478 Unix extensions are available and posix locks would
1479 be supported otherwise. If Unix extensions are not
1480 negotiated this has no effect since mandatory locks
1481 would be used (mandatory locks is all that those
1482 those servers support) */
1484 } else if (strnicmp(data, "setuids", 7) == 0) {
1486 } else if (strnicmp(data, "nosetuids", 9) == 0) {
1488 } else if (strnicmp(data, "dynperm", 7) == 0) {
1489 vol->dynperm = true;
1490 } else if (strnicmp(data, "nodynperm", 9) == 0) {
1491 vol->dynperm = false;
1492 } else if (strnicmp(data, "nohard", 6) == 0) {
1494 } else if (strnicmp(data, "nosoft", 6) == 0) {
1496 } else if (strnicmp(data, "nointr", 6) == 0) {
1498 } else if (strnicmp(data, "intr", 4) == 0) {
1500 } else if (strnicmp(data, "nostrictsync", 12) == 0) {
1501 vol->nostrictsync = 1;
1502 } else if (strnicmp(data, "strictsync", 10) == 0) {
1503 vol->nostrictsync = 0;
1504 } else if (strnicmp(data, "serverino", 7) == 0) {
1505 vol->server_ino = 1;
1506 } else if (strnicmp(data, "noserverino", 9) == 0) {
1507 vol->server_ino = 0;
1508 } else if (strnicmp(data, "rwpidforward", 12) == 0) {
1509 vol->rwpidforward = 1;
1510 } else if (strnicmp(data, "cifsacl", 7) == 0) {
1512 } else if (strnicmp(data, "nocifsacl", 9) == 0) {
1514 } else if (strnicmp(data, "acl", 3) == 0) {
1515 vol->no_psx_acl = 0;
1516 } else if (strnicmp(data, "noacl", 5) == 0) {
1517 vol->no_psx_acl = 1;
1518 } else if (strnicmp(data, "locallease", 6) == 0) {
1519 vol->local_lease = 1;
1520 } else if (strnicmp(data, "sign", 4) == 0) {
1521 vol->secFlg |= CIFSSEC_MUST_SIGN;
1522 } else if (strnicmp(data, "seal", 4) == 0) {
1523 /* we do not do the following in secFlags because seal
1524 is a per tree connection (mount) not a per socket
1525 or per-smb connection option in the protocol */
1526 /* vol->secFlg |= CIFSSEC_MUST_SEAL; */
1528 } else if (strnicmp(data, "direct", 6) == 0) {
1530 } else if (strnicmp(data, "forcedirectio", 13) == 0) {
1532 } else if (strnicmp(data, "strictcache", 11) == 0) {
1534 } else if (strnicmp(data, "noac", 4) == 0) {
1535 printk(KERN_WARNING "CIFS: Mount option noac not "
1536 "supported. Instead set "
1537 "/proc/fs/cifs/LookupCacheEnabled to 0\n");
1538 } else if (strnicmp(data, "fsc", 3) == 0) {
1539 #ifndef CONFIG_CIFS_FSCACHE
1540 cERROR(1, "FS-Cache support needs CONFIG_CIFS_FSCACHE "
1541 "kernel config option set");
1542 goto cifs_parse_mount_err;
1545 } else if (strnicmp(data, "mfsymlinks", 10) == 0) {
1546 vol->mfsymlinks = true;
1547 } else if (strnicmp(data, "multiuser", 8) == 0) {
1548 vol->multiuser = true;
1549 } else if (!strnicmp(data, "backupuid", 9) && value && *value) {
1550 err = kstrtouint(value, 0, &vol->backupuid);
1552 cERROR(1, "%s: Invalid backupuid value",
1554 goto cifs_parse_mount_err;
1556 vol->backupuid_specified = true;
1557 } else if (!strnicmp(data, "backupgid", 9) && value && *value) {
1558 err = kstrtouint(value, 0, &vol->backupgid);
1560 cERROR(1, "%s: Invalid backupgid value",
1562 goto cifs_parse_mount_err;
1564 vol->backupgid_specified = true;
1566 printk(KERN_WARNING "CIFS: Unknown mount option %s\n",
1569 if (vol->UNC == NULL) {
1570 if (devname == NULL) {
1571 printk(KERN_WARNING "CIFS: Missing UNC name for mount "
1573 goto cifs_parse_mount_err;
1575 if ((temp_len = strnlen(devname, 300)) < 300) {
1576 vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
1577 if (vol->UNC == NULL)
1578 goto cifs_parse_mount_err;
1579 strcpy(vol->UNC, devname);
1580 if (strncmp(vol->UNC, "//", 2) == 0) {
1583 } else if (strncmp(vol->UNC, "\\\\", 2) != 0) {
1584 printk(KERN_WARNING "CIFS: UNC Path does not "
1585 "begin with // or \\\\ \n");
1586 goto cifs_parse_mount_err;
1588 value = strpbrk(vol->UNC+2, "/\\");
1592 printk(KERN_WARNING "CIFS: UNC name too long\n");
1593 goto cifs_parse_mount_err;
1597 if (vol->multiuser && !(vol->secFlg & CIFSSEC_MAY_KRB5)) {
1598 cERROR(1, "Multiuser mounts currently require krb5 "
1600 goto cifs_parse_mount_err;
1603 if (vol->UNCip == NULL)
1604 vol->UNCip = &vol->UNC[2];
1607 vol->override_uid = override_uid;
1608 else if (override_uid == 1)
1609 printk(KERN_NOTICE "CIFS: ignoring forceuid mount option "
1610 "specified with no uid= option.\n");
1613 vol->override_gid = override_gid;
1614 else if (override_gid == 1)
1615 printk(KERN_NOTICE "CIFS: ignoring forcegid mount option "
1616 "specified with no gid= option.\n");
1618 kfree(mountdata_copy);
1621 cifs_parse_mount_err:
1622 kfree(mountdata_copy);
1626 /** Returns true if srcaddr isn't specified and rhs isn't
1627 * specified, or if srcaddr is specified and
1628 * matches the IP address of the rhs argument.
1631 srcip_matches(struct sockaddr *srcaddr, struct sockaddr *rhs)
1633 switch (srcaddr->sa_family) {
1635 return (rhs->sa_family == AF_UNSPEC);
1637 struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr;
1638 struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs;
1639 return (saddr4->sin_addr.s_addr == vaddr4->sin_addr.s_addr);
1642 struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr;
1643 struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)&rhs;
1644 return ipv6_addr_equal(&saddr6->sin6_addr, &vaddr6->sin6_addr);
1648 return false; /* don't expect to be here */
1653 * If no port is specified in addr structure, we try to match with 445 port
1654 * and if it fails - with 139 ports. It should be called only if address
1655 * families of server and addr are equal.
1658 match_port(struct TCP_Server_Info *server, struct sockaddr *addr)
1660 __be16 port, *sport;
1662 switch (addr->sa_family) {
1664 sport = &((struct sockaddr_in *) &server->dstaddr)->sin_port;
1665 port = ((struct sockaddr_in *) addr)->sin_port;
1668 sport = &((struct sockaddr_in6 *) &server->dstaddr)->sin6_port;
1669 port = ((struct sockaddr_in6 *) addr)->sin6_port;
1677 port = htons(CIFS_PORT);
1681 port = htons(RFC1001_PORT);
1684 return port == *sport;
1688 match_address(struct TCP_Server_Info *server, struct sockaddr *addr,
1689 struct sockaddr *srcaddr)
1691 switch (addr->sa_family) {
1693 struct sockaddr_in *addr4 = (struct sockaddr_in *)addr;
1694 struct sockaddr_in *srv_addr4 =
1695 (struct sockaddr_in *)&server->dstaddr;
1697 if (addr4->sin_addr.s_addr != srv_addr4->sin_addr.s_addr)
1702 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
1703 struct sockaddr_in6 *srv_addr6 =
1704 (struct sockaddr_in6 *)&server->dstaddr;
1706 if (!ipv6_addr_equal(&addr6->sin6_addr,
1707 &srv_addr6->sin6_addr))
1709 if (addr6->sin6_scope_id != srv_addr6->sin6_scope_id)
1715 return false; /* don't expect to be here */
1718 if (!srcip_matches(srcaddr, (struct sockaddr *)&server->srcaddr))
1725 match_security(struct TCP_Server_Info *server, struct smb_vol *vol)
1727 unsigned int secFlags;
1729 if (vol->secFlg & (~(CIFSSEC_MUST_SIGN | CIFSSEC_MUST_SEAL)))
1730 secFlags = vol->secFlg;
1732 secFlags = global_secflags | vol->secFlg;
1734 switch (server->secType) {
1736 if (!(secFlags & (CIFSSEC_MAY_LANMAN|CIFSSEC_MAY_PLNTXT)))
1740 if (!(secFlags & CIFSSEC_MAY_NTLMV2))
1744 if (!(secFlags & CIFSSEC_MAY_NTLM))
1748 if (!(secFlags & CIFSSEC_MAY_KRB5))
1752 if (!(secFlags & CIFSSEC_MAY_NTLMSSP))
1756 /* shouldn't happen */
1760 /* now check if signing mode is acceptable */
1761 if ((secFlags & CIFSSEC_MAY_SIGN) == 0 &&
1762 (server->sec_mode & SECMODE_SIGN_REQUIRED))
1764 else if (((secFlags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN) &&
1766 (SECMODE_SIGN_ENABLED|SECMODE_SIGN_REQUIRED)) == 0)
1772 static int match_server(struct TCP_Server_Info *server, struct sockaddr *addr,
1773 struct smb_vol *vol)
1775 if (!net_eq(cifs_net_ns(server), current->nsproxy->net_ns))
1778 if (!match_address(server, addr,
1779 (struct sockaddr *)&vol->srcaddr))
1782 if (!match_port(server, addr))
1785 if (!match_security(server, vol))
1791 static struct TCP_Server_Info *
1792 cifs_find_tcp_session(struct sockaddr *addr, struct smb_vol *vol)
1794 struct TCP_Server_Info *server;
1796 spin_lock(&cifs_tcp_ses_lock);
1797 list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
1798 if (!match_server(server, addr, vol))
1801 ++server->srv_count;
1802 spin_unlock(&cifs_tcp_ses_lock);
1803 cFYI(1, "Existing tcp session with server found");
1806 spin_unlock(&cifs_tcp_ses_lock);
1811 cifs_put_tcp_session(struct TCP_Server_Info *server)
1813 struct task_struct *task;
1815 spin_lock(&cifs_tcp_ses_lock);
1816 if (--server->srv_count > 0) {
1817 spin_unlock(&cifs_tcp_ses_lock);
1821 put_net(cifs_net_ns(server));
1823 list_del_init(&server->tcp_ses_list);
1824 spin_unlock(&cifs_tcp_ses_lock);
1826 cancel_delayed_work_sync(&server->echo);
1828 spin_lock(&GlobalMid_Lock);
1829 server->tcpStatus = CifsExiting;
1830 spin_unlock(&GlobalMid_Lock);
1832 cifs_crypto_shash_release(server);
1833 cifs_fscache_release_client_cookie(server);
1835 kfree(server->session_key.response);
1836 server->session_key.response = NULL;
1837 server->session_key.len = 0;
1839 task = xchg(&server->tsk, NULL);
1841 force_sig(SIGKILL, task);
1844 static struct TCP_Server_Info *
1845 cifs_get_tcp_session(struct smb_vol *volume_info)
1847 struct TCP_Server_Info *tcp_ses = NULL;
1848 struct sockaddr_storage addr;
1849 struct sockaddr_in *sin_server = (struct sockaddr_in *) &addr;
1850 struct sockaddr_in6 *sin_server6 = (struct sockaddr_in6 *) &addr;
1853 memset(&addr, 0, sizeof(struct sockaddr_storage));
1855 cFYI(1, "UNC: %s ip: %s", volume_info->UNC, volume_info->UNCip);
1857 if (volume_info->UNCip && volume_info->UNC) {
1858 rc = cifs_fill_sockaddr((struct sockaddr *)&addr,
1860 strlen(volume_info->UNCip),
1863 /* we failed translating address */
1867 } else if (volume_info->UNCip) {
1868 /* BB using ip addr as tcp_ses name to connect to the
1870 cERROR(1, "Connecting to DFS root not implemented yet");
1873 } else /* which tcp_sess DFS root would we conect to */ {
1874 cERROR(1, "CIFS mount error: No UNC path (e.g. -o "
1875 "unc=//192.168.1.100/public) specified");
1880 /* see if we already have a matching tcp_ses */
1881 tcp_ses = cifs_find_tcp_session((struct sockaddr *)&addr, volume_info);
1885 tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
1891 rc = cifs_crypto_shash_allocate(tcp_ses);
1893 cERROR(1, "could not setup hash structures rc %d", rc);
1897 cifs_set_net_ns(tcp_ses, get_net(current->nsproxy->net_ns));
1898 tcp_ses->hostname = extract_hostname(volume_info->UNC);
1899 if (IS_ERR(tcp_ses->hostname)) {
1900 rc = PTR_ERR(tcp_ses->hostname);
1901 goto out_err_crypto_release;
1904 tcp_ses->noblocksnd = volume_info->noblocksnd;
1905 tcp_ses->noautotune = volume_info->noautotune;
1906 tcp_ses->tcp_nodelay = volume_info->sockopt_tcp_nodelay;
1907 atomic_set(&tcp_ses->inFlight, 0);
1908 init_waitqueue_head(&tcp_ses->response_q);
1909 init_waitqueue_head(&tcp_ses->request_q);
1910 INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
1911 mutex_init(&tcp_ses->srv_mutex);
1912 memcpy(tcp_ses->workstation_RFC1001_name,
1913 volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1914 memcpy(tcp_ses->server_RFC1001_name,
1915 volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1916 tcp_ses->session_estab = false;
1917 tcp_ses->sequence_number = 0;
1918 tcp_ses->lstrp = jiffies;
1919 INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
1920 INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
1921 INIT_DELAYED_WORK(&tcp_ses->echo, cifs_echo_request);
1924 * at this point we are the only ones with the pointer
1925 * to the struct since the kernel thread not created yet
1926 * no need to spinlock this init of tcpStatus or srv_count
1928 tcp_ses->tcpStatus = CifsNew;
1929 memcpy(&tcp_ses->srcaddr, &volume_info->srcaddr,
1930 sizeof(tcp_ses->srcaddr));
1931 ++tcp_ses->srv_count;
1933 if (addr.ss_family == AF_INET6) {
1934 cFYI(1, "attempting ipv6 connect");
1935 /* BB should we allow ipv6 on port 139? */
1936 /* other OS never observed in Wild doing 139 with v6 */
1937 memcpy(&tcp_ses->dstaddr, sin_server6,
1938 sizeof(struct sockaddr_in6));
1940 memcpy(&tcp_ses->dstaddr, sin_server,
1941 sizeof(struct sockaddr_in));
1943 rc = ip_connect(tcp_ses);
1945 cERROR(1, "Error connecting to socket. Aborting operation");
1946 goto out_err_crypto_release;
1950 * since we're in a cifs function already, we know that
1951 * this will succeed. No need for try_module_get().
1953 __module_get(THIS_MODULE);
1954 tcp_ses->tsk = kthread_run(cifs_demultiplex_thread,
1956 if (IS_ERR(tcp_ses->tsk)) {
1957 rc = PTR_ERR(tcp_ses->tsk);
1958 cERROR(1, "error %d create cifsd thread", rc);
1959 module_put(THIS_MODULE);
1960 goto out_err_crypto_release;
1962 tcp_ses->tcpStatus = CifsNeedNegotiate;
1964 /* thread spawned, put it on the list */
1965 spin_lock(&cifs_tcp_ses_lock);
1966 list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
1967 spin_unlock(&cifs_tcp_ses_lock);
1969 cifs_fscache_get_client_cookie(tcp_ses);
1971 /* queue echo request delayed work */
1972 queue_delayed_work(system_nrt_wq, &tcp_ses->echo, SMB_ECHO_INTERVAL);
1976 out_err_crypto_release:
1977 cifs_crypto_shash_release(tcp_ses);
1979 put_net(cifs_net_ns(tcp_ses));
1983 if (!IS_ERR(tcp_ses->hostname))
1984 kfree(tcp_ses->hostname);
1985 if (tcp_ses->ssocket)
1986 sock_release(tcp_ses->ssocket);
1992 static int match_session(struct cifs_ses *ses, struct smb_vol *vol)
1994 switch (ses->server->secType) {
1996 if (vol->cred_uid != ses->cred_uid)
2000 /* anything else takes username/password */
2001 if (ses->user_name == NULL)
2003 if (strncmp(ses->user_name, vol->username,
2006 if (strlen(vol->username) != 0 &&
2007 ses->password != NULL &&
2008 strncmp(ses->password,
2009 vol->password ? vol->password : "",
2016 static struct cifs_ses *
2017 cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol)
2019 struct cifs_ses *ses;
2021 spin_lock(&cifs_tcp_ses_lock);
2022 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
2023 if (!match_session(ses, vol))
2026 spin_unlock(&cifs_tcp_ses_lock);
2029 spin_unlock(&cifs_tcp_ses_lock);
2034 cifs_put_smb_ses(struct cifs_ses *ses)
2037 struct TCP_Server_Info *server = ses->server;
2039 cFYI(1, "%s: ses_count=%d\n", __func__, ses->ses_count);
2040 spin_lock(&cifs_tcp_ses_lock);
2041 if (--ses->ses_count > 0) {
2042 spin_unlock(&cifs_tcp_ses_lock);
2046 list_del_init(&ses->smb_ses_list);
2047 spin_unlock(&cifs_tcp_ses_lock);
2049 if (ses->status == CifsGood) {
2051 CIFSSMBLogoff(xid, ses);
2055 cifs_put_tcp_session(server);
2058 static bool warned_on_ntlm; /* globals init to false automatically */
2060 static struct cifs_ses *
2061 cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
2063 int rc = -ENOMEM, xid;
2064 struct cifs_ses *ses;
2065 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
2066 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
2070 ses = cifs_find_smb_ses(server, volume_info);
2072 cFYI(1, "Existing smb sess found (status=%d)", ses->status);
2074 mutex_lock(&ses->session_mutex);
2075 rc = cifs_negotiate_protocol(xid, ses);
2077 mutex_unlock(&ses->session_mutex);
2078 /* problem -- put our ses reference */
2079 cifs_put_smb_ses(ses);
2083 if (ses->need_reconnect) {
2084 cFYI(1, "Session needs reconnect");
2085 rc = cifs_setup_session(xid, ses,
2086 volume_info->local_nls);
2088 mutex_unlock(&ses->session_mutex);
2089 /* problem -- put our reference */
2090 cifs_put_smb_ses(ses);
2095 mutex_unlock(&ses->session_mutex);
2097 /* existing SMB ses has a server reference already */
2098 cifs_put_tcp_session(server);
2103 cFYI(1, "Existing smb sess not found");
2104 ses = sesInfoAlloc();
2108 /* new SMB session uses our server ref */
2109 ses->server = server;
2110 if (server->dstaddr.ss_family == AF_INET6)
2111 sprintf(ses->serverName, "%pI6", &addr6->sin6_addr);
2113 sprintf(ses->serverName, "%pI4", &addr->sin_addr);
2115 if (volume_info->username) {
2116 ses->user_name = kstrdup(volume_info->username, GFP_KERNEL);
2117 if (!ses->user_name)
2121 /* volume_info->password freed at unmount */
2122 if (volume_info->password) {
2123 ses->password = kstrdup(volume_info->password, GFP_KERNEL);
2127 if (volume_info->domainname) {
2128 ses->domainName = kstrdup(volume_info->domainname, GFP_KERNEL);
2129 if (!ses->domainName)
2132 ses->cred_uid = volume_info->cred_uid;
2133 ses->linux_uid = volume_info->linux_uid;
2135 /* ntlmv2 is much stronger than ntlm security, and has been broadly
2136 supported for many years, time to update default security mechanism */
2137 if ((volume_info->secFlg == 0) && warned_on_ntlm == false) {
2138 warned_on_ntlm = true;
2139 cERROR(1, "default security mechanism requested. The default "
2140 "security mechanism will be upgraded from ntlm to "
2141 "ntlmv2 in kernel release 3.3");
2143 ses->overrideSecFlg = volume_info->secFlg;
2145 mutex_lock(&ses->session_mutex);
2146 rc = cifs_negotiate_protocol(xid, ses);
2148 rc = cifs_setup_session(xid, ses, volume_info->local_nls);
2149 mutex_unlock(&ses->session_mutex);
2153 /* success, put it on the list */
2154 spin_lock(&cifs_tcp_ses_lock);
2155 list_add(&ses->smb_ses_list, &server->smb_ses_list);
2156 spin_unlock(&cifs_tcp_ses_lock);
2167 static int match_tcon(struct cifs_tcon *tcon, const char *unc)
2169 if (tcon->tidStatus == CifsExiting)
2171 if (strncmp(tcon->treeName, unc, MAX_TREE_SIZE))
2176 static struct cifs_tcon *
2177 cifs_find_tcon(struct cifs_ses *ses, const char *unc)
2179 struct list_head *tmp;
2180 struct cifs_tcon *tcon;
2182 spin_lock(&cifs_tcp_ses_lock);
2183 list_for_each(tmp, &ses->tcon_list) {
2184 tcon = list_entry(tmp, struct cifs_tcon, tcon_list);
2185 if (!match_tcon(tcon, unc))
2188 spin_unlock(&cifs_tcp_ses_lock);
2191 spin_unlock(&cifs_tcp_ses_lock);
2196 cifs_put_tcon(struct cifs_tcon *tcon)
2199 struct cifs_ses *ses = tcon->ses;
2201 cFYI(1, "%s: tc_count=%d\n", __func__, tcon->tc_count);
2202 spin_lock(&cifs_tcp_ses_lock);
2203 if (--tcon->tc_count > 0) {
2204 spin_unlock(&cifs_tcp_ses_lock);
2208 list_del_init(&tcon->tcon_list);
2209 spin_unlock(&cifs_tcp_ses_lock);
2212 CIFSSMBTDis(xid, tcon);
2215 cifs_fscache_release_super_cookie(tcon);
2217 cifs_put_smb_ses(ses);
2220 static struct cifs_tcon *
2221 cifs_get_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
2224 struct cifs_tcon *tcon;
2226 tcon = cifs_find_tcon(ses, volume_info->UNC);
2228 cFYI(1, "Found match on UNC path");
2229 /* existing tcon already has a reference */
2230 cifs_put_smb_ses(ses);
2231 if (tcon->seal != volume_info->seal)
2232 cERROR(1, "transport encryption setting "
2233 "conflicts with existing tid");
2237 tcon = tconInfoAlloc();
2244 if (volume_info->password) {
2245 tcon->password = kstrdup(volume_info->password, GFP_KERNEL);
2246 if (!tcon->password) {
2252 if (strchr(volume_info->UNC + 3, '\\') == NULL
2253 && strchr(volume_info->UNC + 3, '/') == NULL) {
2254 cERROR(1, "Missing share name");
2259 /* BB Do we need to wrap session_mutex around
2260 * this TCon call and Unix SetFS as
2261 * we do on SessSetup and reconnect? */
2263 rc = CIFSTCon(xid, ses, volume_info->UNC, tcon, volume_info->local_nls);
2265 cFYI(1, "CIFS Tcon rc = %d", rc);
2269 if (volume_info->nodfs) {
2270 tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
2271 cFYI(1, "DFS disabled (%d)", tcon->Flags);
2273 tcon->seal = volume_info->seal;
2274 /* we can have only one retry value for a connection
2275 to a share so for resources mounted more than once
2276 to the same server share the last value passed in
2277 for the retry flag is used */
2278 tcon->retry = volume_info->retry;
2279 tcon->nocase = volume_info->nocase;
2280 tcon->local_lease = volume_info->local_lease;
2282 spin_lock(&cifs_tcp_ses_lock);
2283 list_add(&tcon->tcon_list, &ses->tcon_list);
2284 spin_unlock(&cifs_tcp_ses_lock);
2286 cifs_fscache_get_super_cookie(tcon);
2296 cifs_put_tlink(struct tcon_link *tlink)
2298 if (!tlink || IS_ERR(tlink))
2301 if (!atomic_dec_and_test(&tlink->tl_count) ||
2302 test_bit(TCON_LINK_IN_TREE, &tlink->tl_flags)) {
2303 tlink->tl_time = jiffies;
2307 if (!IS_ERR(tlink_tcon(tlink)))
2308 cifs_put_tcon(tlink_tcon(tlink));
2313 static inline struct tcon_link *
2314 cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb)
2316 return cifs_sb->master_tlink;
2320 compare_mount_options(struct super_block *sb, struct cifs_mnt_data *mnt_data)
2322 struct cifs_sb_info *old = CIFS_SB(sb);
2323 struct cifs_sb_info *new = mnt_data->cifs_sb;
2325 if ((sb->s_flags & CIFS_MS_MASK) != (mnt_data->flags & CIFS_MS_MASK))
2328 if ((old->mnt_cifs_flags & CIFS_MOUNT_MASK) !=
2329 (new->mnt_cifs_flags & CIFS_MOUNT_MASK))
2333 * We want to share sb only if we don't specify an r/wsize or
2334 * specified r/wsize is greater than or equal to existing one.
2336 if (new->wsize && new->wsize < old->wsize)
2339 if (new->rsize && new->rsize < old->rsize)
2342 if (old->mnt_uid != new->mnt_uid || old->mnt_gid != new->mnt_gid)
2345 if (old->mnt_file_mode != new->mnt_file_mode ||
2346 old->mnt_dir_mode != new->mnt_dir_mode)
2349 if (strcmp(old->local_nls->charset, new->local_nls->charset))
2352 if (old->actimeo != new->actimeo)
2359 cifs_match_super(struct super_block *sb, void *data)
2361 struct cifs_mnt_data *mnt_data = (struct cifs_mnt_data *)data;
2362 struct smb_vol *volume_info;
2363 struct cifs_sb_info *cifs_sb;
2364 struct TCP_Server_Info *tcp_srv;
2365 struct cifs_ses *ses;
2366 struct cifs_tcon *tcon;
2367 struct tcon_link *tlink;
2368 struct sockaddr_storage addr;
2371 memset(&addr, 0, sizeof(struct sockaddr_storage));
2373 spin_lock(&cifs_tcp_ses_lock);
2374 cifs_sb = CIFS_SB(sb);
2375 tlink = cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
2376 if (IS_ERR(tlink)) {
2377 spin_unlock(&cifs_tcp_ses_lock);
2380 tcon = tlink_tcon(tlink);
2382 tcp_srv = ses->server;
2384 volume_info = mnt_data->vol;
2386 if (!volume_info->UNCip || !volume_info->UNC)
2389 rc = cifs_fill_sockaddr((struct sockaddr *)&addr,
2391 strlen(volume_info->UNCip),
2396 if (!match_server(tcp_srv, (struct sockaddr *)&addr, volume_info) ||
2397 !match_session(ses, volume_info) ||
2398 !match_tcon(tcon, volume_info->UNC)) {
2403 rc = compare_mount_options(sb, mnt_data);
2405 spin_unlock(&cifs_tcp_ses_lock);
2406 cifs_put_tlink(tlink);
2411 get_dfs_path(int xid, struct cifs_ses *pSesInfo, const char *old_path,
2412 const struct nls_table *nls_codepage, unsigned int *pnum_referrals,
2413 struct dfs_info3_param **preferrals, int remap)
2418 *pnum_referrals = 0;
2421 if (pSesInfo->ipc_tid == 0) {
2422 temp_unc = kmalloc(2 /* for slashes */ +
2423 strnlen(pSesInfo->serverName,
2424 SERVER_NAME_LEN_WITH_NULL * 2)
2425 + 1 + 4 /* slash IPC$ */ + 2,
2427 if (temp_unc == NULL)
2431 strcpy(temp_unc + 2, pSesInfo->serverName);
2432 strcpy(temp_unc + 2 + strlen(pSesInfo->serverName), "\\IPC$");
2433 rc = CIFSTCon(xid, pSesInfo, temp_unc, NULL, nls_codepage);
2434 cFYI(1, "CIFS Tcon rc = %d ipc_tid = %d", rc, pSesInfo->ipc_tid);
2438 rc = CIFSGetDFSRefer(xid, pSesInfo, old_path, preferrals,
2439 pnum_referrals, nls_codepage, remap);
2440 /* BB map targetUNCs to dfs_info3 structures, here or
2441 in CIFSGetDFSRefer BB */
2446 #ifdef CONFIG_DEBUG_LOCK_ALLOC
2447 static struct lock_class_key cifs_key[2];
2448 static struct lock_class_key cifs_slock_key[2];
2451 cifs_reclassify_socket4(struct socket *sock)
2453 struct sock *sk = sock->sk;
2454 BUG_ON(sock_owned_by_user(sk));
2455 sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
2456 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
2460 cifs_reclassify_socket6(struct socket *sock)
2462 struct sock *sk = sock->sk;
2463 BUG_ON(sock_owned_by_user(sk));
2464 sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
2465 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
2469 cifs_reclassify_socket4(struct socket *sock)
2474 cifs_reclassify_socket6(struct socket *sock)
2479 /* See RFC1001 section 14 on representation of Netbios names */
2480 static void rfc1002mangle(char *target, char *source, unsigned int length)
2484 for (i = 0, j = 0; i < (length); i++) {
2485 /* mask a nibble at a time and encode */
2486 target[j] = 'A' + (0x0F & (source[i] >> 4));
2487 target[j+1] = 'A' + (0x0F & source[i]);
2494 bind_socket(struct TCP_Server_Info *server)
2497 if (server->srcaddr.ss_family != AF_UNSPEC) {
2498 /* Bind to the specified local IP address */
2499 struct socket *socket = server->ssocket;
2500 rc = socket->ops->bind(socket,
2501 (struct sockaddr *) &server->srcaddr,
2502 sizeof(server->srcaddr));
2504 struct sockaddr_in *saddr4;
2505 struct sockaddr_in6 *saddr6;
2506 saddr4 = (struct sockaddr_in *)&server->srcaddr;
2507 saddr6 = (struct sockaddr_in6 *)&server->srcaddr;
2508 if (saddr6->sin6_family == AF_INET6)
2510 "Failed to bind to: %pI6c, error: %d\n",
2511 &saddr6->sin6_addr, rc);
2514 "Failed to bind to: %pI4, error: %d\n",
2515 &saddr4->sin_addr.s_addr, rc);
2522 ip_rfc1001_connect(struct TCP_Server_Info *server)
2526 * some servers require RFC1001 sessinit before sending
2527 * negprot - BB check reconnection in case where second
2528 * sessinit is sent but no second negprot
2530 struct rfc1002_session_packet *ses_init_buf;
2531 struct smb_hdr *smb_buf;
2532 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
2535 ses_init_buf->trailer.session_req.called_len = 32;
2537 if (server->server_RFC1001_name &&
2538 server->server_RFC1001_name[0] != 0)
2539 rfc1002mangle(ses_init_buf->trailer.
2540 session_req.called_name,
2541 server->server_RFC1001_name,
2542 RFC1001_NAME_LEN_WITH_NULL);
2544 rfc1002mangle(ses_init_buf->trailer.
2545 session_req.called_name,
2546 DEFAULT_CIFS_CALLED_NAME,
2547 RFC1001_NAME_LEN_WITH_NULL);
2549 ses_init_buf->trailer.session_req.calling_len = 32;
2552 * calling name ends in null (byte 16) from old smb
2555 if (server->workstation_RFC1001_name &&
2556 server->workstation_RFC1001_name[0] != 0)
2557 rfc1002mangle(ses_init_buf->trailer.
2558 session_req.calling_name,
2559 server->workstation_RFC1001_name,
2560 RFC1001_NAME_LEN_WITH_NULL);
2562 rfc1002mangle(ses_init_buf->trailer.
2563 session_req.calling_name,
2565 RFC1001_NAME_LEN_WITH_NULL);
2567 ses_init_buf->trailer.session_req.scope1 = 0;
2568 ses_init_buf->trailer.session_req.scope2 = 0;
2569 smb_buf = (struct smb_hdr *)ses_init_buf;
2571 /* sizeof RFC1002_SESSION_REQUEST with no scope */
2572 smb_buf->smb_buf_length = cpu_to_be32(0x81000044);
2573 rc = smb_send(server, smb_buf, 0x44);
2574 kfree(ses_init_buf);
2576 * RFC1001 layer in at least one server
2577 * requires very short break before negprot
2578 * presumably because not expecting negprot
2579 * to follow so fast. This is a simple
2580 * solution that works without
2581 * complicating the code and causes no
2582 * significant slowing down on mount
2585 usleep_range(1000, 2000);
2588 * else the negprot may still work without this
2589 * even though malloc failed
2596 generic_ip_connect(struct TCP_Server_Info *server)
2601 struct socket *socket = server->ssocket;
2602 struct sockaddr *saddr;
2604 saddr = (struct sockaddr *) &server->dstaddr;
2606 if (server->dstaddr.ss_family == AF_INET6) {
2607 sport = ((struct sockaddr_in6 *) saddr)->sin6_port;
2608 slen = sizeof(struct sockaddr_in6);
2611 sport = ((struct sockaddr_in *) saddr)->sin_port;
2612 slen = sizeof(struct sockaddr_in);
2616 if (socket == NULL) {
2617 rc = __sock_create(cifs_net_ns(server), sfamily, SOCK_STREAM,
2618 IPPROTO_TCP, &socket, 1);
2620 cERROR(1, "Error %d creating socket", rc);
2621 server->ssocket = NULL;
2625 /* BB other socket options to set KEEPALIVE, NODELAY? */
2626 cFYI(1, "Socket created");
2627 server->ssocket = socket;
2628 socket->sk->sk_allocation = GFP_NOFS;
2629 if (sfamily == AF_INET6)
2630 cifs_reclassify_socket6(socket);
2632 cifs_reclassify_socket4(socket);
2635 rc = bind_socket(server);
2640 * Eventually check for other socket options to change from
2641 * the default. sock_setsockopt not used because it expects
2644 socket->sk->sk_rcvtimeo = 7 * HZ;
2645 socket->sk->sk_sndtimeo = 5 * HZ;
2647 /* make the bufsizes depend on wsize/rsize and max requests */
2648 if (server->noautotune) {
2649 if (socket->sk->sk_sndbuf < (200 * 1024))
2650 socket->sk->sk_sndbuf = 200 * 1024;
2651 if (socket->sk->sk_rcvbuf < (140 * 1024))
2652 socket->sk->sk_rcvbuf = 140 * 1024;
2655 if (server->tcp_nodelay) {
2657 rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
2658 (char *)&val, sizeof(val));
2660 cFYI(1, "set TCP_NODELAY socket option error %d", rc);
2663 cFYI(1, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx",
2664 socket->sk->sk_sndbuf,
2665 socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
2667 rc = socket->ops->connect(socket, saddr, slen, 0);
2669 cFYI(1, "Error %d connecting to server", rc);
2670 sock_release(socket);
2671 server->ssocket = NULL;
2675 if (sport == htons(RFC1001_PORT))
2676 rc = ip_rfc1001_connect(server);
2682 ip_connect(struct TCP_Server_Info *server)
2685 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
2686 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
2688 if (server->dstaddr.ss_family == AF_INET6)
2689 sport = &addr6->sin6_port;
2691 sport = &addr->sin_port;
2696 /* try with 445 port at first */
2697 *sport = htons(CIFS_PORT);
2699 rc = generic_ip_connect(server);
2703 /* if it failed, try with 139 port */
2704 *sport = htons(RFC1001_PORT);
2707 return generic_ip_connect(server);
2710 void reset_cifs_unix_caps(int xid, struct cifs_tcon *tcon,
2711 struct cifs_sb_info *cifs_sb, struct smb_vol *vol_info)
2713 /* if we are reconnecting then should we check to see if
2714 * any requested capabilities changed locally e.g. via
2715 * remount but we can not do much about it here
2716 * if they have (even if we could detect it by the following)
2717 * Perhaps we could add a backpointer to array of sb from tcon
2718 * or if we change to make all sb to same share the same
2719 * sb as NFS - then we only have one backpointer to sb.
2720 * What if we wanted to mount the server share twice once with
2721 * and once without posixacls or posix paths? */
2722 __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
2724 if (vol_info && vol_info->no_linux_ext) {
2725 tcon->fsUnixInfo.Capability = 0;
2726 tcon->unix_ext = 0; /* Unix Extensions disabled */
2727 cFYI(1, "Linux protocol extensions disabled");
2729 } else if (vol_info)
2730 tcon->unix_ext = 1; /* Unix Extensions supported */
2732 if (tcon->unix_ext == 0) {
2733 cFYI(1, "Unix extensions disabled so not set on reconnect");
2737 if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
2738 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
2739 cFYI(1, "unix caps which server supports %lld", cap);
2740 /* check for reconnect case in which we do not
2741 want to change the mount behavior if we can avoid it */
2742 if (vol_info == NULL) {
2743 /* turn off POSIX ACL and PATHNAMES if not set
2744 originally at mount time */
2745 if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
2746 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
2747 if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
2748 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
2749 cERROR(1, "POSIXPATH support change");
2750 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
2751 } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
2752 cERROR(1, "possible reconnect error");
2753 cERROR(1, "server disabled POSIX path support");
2757 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
2758 cERROR(1, "per-share encryption not supported yet");
2760 cap &= CIFS_UNIX_CAP_MASK;
2761 if (vol_info && vol_info->no_psx_acl)
2762 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
2763 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
2764 cFYI(1, "negotiated posix acl support");
2766 cifs_sb->mnt_cifs_flags |=
2767 CIFS_MOUNT_POSIXACL;
2770 if (vol_info && vol_info->posix_paths == 0)
2771 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
2772 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
2773 cFYI(1, "negotiate posix pathnames");
2775 cifs_sb->mnt_cifs_flags |=
2776 CIFS_MOUNT_POSIX_PATHS;
2779 cFYI(1, "Negotiate caps 0x%x", (int)cap);
2780 #ifdef CONFIG_CIFS_DEBUG2
2781 if (cap & CIFS_UNIX_FCNTL_CAP)
2782 cFYI(1, "FCNTL cap");
2783 if (cap & CIFS_UNIX_EXTATTR_CAP)
2784 cFYI(1, "EXTATTR cap");
2785 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
2786 cFYI(1, "POSIX path cap");
2787 if (cap & CIFS_UNIX_XATTR_CAP)
2788 cFYI(1, "XATTR cap");
2789 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
2790 cFYI(1, "POSIX ACL cap");
2791 if (cap & CIFS_UNIX_LARGE_READ_CAP)
2792 cFYI(1, "very large read cap");
2793 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
2794 cFYI(1, "very large write cap");
2795 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_CAP)
2796 cFYI(1, "transport encryption cap");
2797 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
2798 cFYI(1, "mandatory transport encryption cap");
2799 #endif /* CIFS_DEBUG2 */
2800 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
2801 if (vol_info == NULL) {
2802 cFYI(1, "resetting capabilities failed");
2804 cERROR(1, "Negotiating Unix capabilities "
2805 "with the server failed. Consider "
2806 "mounting with the Unix Extensions\n"
2807 "disabled, if problems are found, "
2808 "by specifying the nounix mount "
2815 void cifs_setup_cifs_sb(struct smb_vol *pvolume_info,
2816 struct cifs_sb_info *cifs_sb)
2818 INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks);
2820 spin_lock_init(&cifs_sb->tlink_tree_lock);
2821 cifs_sb->tlink_tree = RB_ROOT;
2824 * Temporarily set r/wsize for matching superblock. If we end up using
2825 * new sb then client will later negotiate it downward if needed.
2827 cifs_sb->rsize = pvolume_info->rsize;
2828 cifs_sb->wsize = pvolume_info->wsize;
2830 cifs_sb->mnt_uid = pvolume_info->linux_uid;
2831 cifs_sb->mnt_gid = pvolume_info->linux_gid;
2832 if (pvolume_info->backupuid_specified)
2833 cifs_sb->mnt_backupuid = pvolume_info->backupuid;
2834 if (pvolume_info->backupgid_specified)
2835 cifs_sb->mnt_backupgid = pvolume_info->backupgid;
2836 cifs_sb->mnt_file_mode = pvolume_info->file_mode;
2837 cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
2838 cFYI(1, "file mode: 0x%hx dir mode: 0x%hx",
2839 cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode);
2841 cifs_sb->actimeo = pvolume_info->actimeo;
2842 cifs_sb->local_nls = pvolume_info->local_nls;
2844 if (pvolume_info->noperm)
2845 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
2846 if (pvolume_info->setuids)
2847 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
2848 if (pvolume_info->server_ino)
2849 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
2850 if (pvolume_info->remap)
2851 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
2852 if (pvolume_info->no_xattr)
2853 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
2854 if (pvolume_info->sfu_emul)
2855 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
2856 if (pvolume_info->nobrl)
2857 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
2858 if (pvolume_info->nostrictsync)
2859 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
2860 if (pvolume_info->mand_lock)
2861 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
2862 if (pvolume_info->rwpidforward)
2863 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RWPIDFORWARD;
2864 if (pvolume_info->cifs_acl)
2865 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
2866 if (pvolume_info->backupuid_specified)
2867 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPUID;
2868 if (pvolume_info->backupgid_specified)
2869 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPGID;
2870 if (pvolume_info->override_uid)
2871 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
2872 if (pvolume_info->override_gid)
2873 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
2874 if (pvolume_info->dynperm)
2875 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
2876 if (pvolume_info->fsc)
2877 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_FSCACHE;
2878 if (pvolume_info->multiuser)
2879 cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_MULTIUSER |
2880 CIFS_MOUNT_NO_PERM);
2881 if (pvolume_info->strict_io)
2882 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_STRICT_IO;
2883 if (pvolume_info->direct_io) {
2884 cFYI(1, "mounting share using direct i/o");
2885 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
2887 if (pvolume_info->mfsymlinks) {
2888 if (pvolume_info->sfu_emul) {
2889 cERROR(1, "mount option mfsymlinks ignored if sfu "
2890 "mount option is used");
2892 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MF_SYMLINKS;
2896 if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
2897 cERROR(1, "mount option dynperm ignored if cifsacl "
2898 "mount option supported");
2902 * When the server supports very large reads and writes via POSIX extensions,
2903 * we can allow up to 2^24-1, minus the size of a READ/WRITE_AND_X header, not
2904 * including the RFC1001 length.
2906 * Note that this might make for "interesting" allocation problems during
2907 * writeback however as we have to allocate an array of pointers for the
2908 * pages. A 16M write means ~32kb page array with PAGE_CACHE_SIZE == 4096.
2910 * For reads, there is a similar problem as we need to allocate an array
2911 * of kvecs to handle the receive, though that should only need to be done
2914 #define CIFS_MAX_WSIZE ((1<<24) - 1 - sizeof(WRITE_REQ) + 4)
2915 #define CIFS_MAX_RSIZE ((1<<24) - sizeof(READ_RSP) + 4)
2918 * When the server doesn't allow large posix writes, only allow a rsize/wsize
2919 * of 2^17-1 minus the size of the call header. That allows for a read or
2920 * write up to the maximum size described by RFC1002.
2922 #define CIFS_MAX_RFC1002_WSIZE ((1<<17) - 1 - sizeof(WRITE_REQ) + 4)
2923 #define CIFS_MAX_RFC1002_RSIZE ((1<<17) - 1 - sizeof(READ_RSP) + 4)
2926 * The default wsize is 1M. find_get_pages seems to return a maximum of 256
2927 * pages in a single call. With PAGE_CACHE_SIZE == 4k, this means we can fill
2928 * a single wsize request with a single call.
2930 #define CIFS_DEFAULT_IOSIZE (1024 * 1024)
2933 * Windows only supports a max of 60k reads. Default to that when posix
2934 * extensions aren't in force.
2936 #define CIFS_DEFAULT_NON_POSIX_RSIZE (60 * 1024)
2939 cifs_negotiate_wsize(struct cifs_tcon *tcon, struct smb_vol *pvolume_info)
2941 __u64 unix_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
2942 struct TCP_Server_Info *server = tcon->ses->server;
2943 unsigned int wsize = pvolume_info->wsize ? pvolume_info->wsize :
2944 CIFS_DEFAULT_IOSIZE;
2946 /* can server support 24-bit write sizes? (via UNIX extensions) */
2947 if (!tcon->unix_ext || !(unix_cap & CIFS_UNIX_LARGE_WRITE_CAP))
2948 wsize = min_t(unsigned int, wsize, CIFS_MAX_RFC1002_WSIZE);
2951 * no CAP_LARGE_WRITE_X or is signing enabled without CAP_UNIX set?
2952 * Limit it to max buffer offered by the server, minus the size of the
2953 * WRITEX header, not including the 4 byte RFC1001 length.
2955 if (!(server->capabilities & CAP_LARGE_WRITE_X) ||
2956 (!(server->capabilities & CAP_UNIX) &&
2957 (server->sec_mode & (SECMODE_SIGN_ENABLED|SECMODE_SIGN_REQUIRED))))
2958 wsize = min_t(unsigned int, wsize,
2959 server->maxBuf - sizeof(WRITE_REQ) + 4);
2961 /* hard limit of CIFS_MAX_WSIZE */
2962 wsize = min_t(unsigned int, wsize, CIFS_MAX_WSIZE);
2968 cifs_negotiate_rsize(struct cifs_tcon *tcon, struct smb_vol *pvolume_info)
2970 __u64 unix_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
2971 struct TCP_Server_Info *server = tcon->ses->server;
2972 unsigned int rsize, defsize;
2975 * Set default value...
2977 * HACK alert! Ancient servers have very small buffers. Even though
2978 * MS-CIFS indicates that servers are only limited by the client's
2979 * bufsize for reads, testing against win98se shows that it throws
2980 * INVALID_PARAMETER errors if you try to request too large a read.
2982 * If the server advertises a MaxBufferSize of less than one page,
2983 * assume that it also can't satisfy reads larger than that either.
2985 * FIXME: Is there a better heuristic for this?
2987 if (tcon->unix_ext && (unix_cap & CIFS_UNIX_LARGE_READ_CAP))
2988 defsize = CIFS_DEFAULT_IOSIZE;
2989 else if (server->capabilities & CAP_LARGE_READ_X)
2990 defsize = CIFS_DEFAULT_NON_POSIX_RSIZE;
2991 else if (server->maxBuf >= PAGE_CACHE_SIZE)
2992 defsize = CIFSMaxBufSize;
2994 defsize = server->maxBuf - sizeof(READ_RSP);
2996 rsize = pvolume_info->rsize ? pvolume_info->rsize : defsize;
2999 * no CAP_LARGE_READ_X? Then MS-CIFS states that we must limit this to
3000 * the client's MaxBufferSize.
3002 if (!(server->capabilities & CAP_LARGE_READ_X))
3003 rsize = min_t(unsigned int, CIFSMaxBufSize, rsize);
3005 /* hard limit of CIFS_MAX_RSIZE */
3006 rsize = min_t(unsigned int, rsize, CIFS_MAX_RSIZE);
3012 is_path_accessible(int xid, struct cifs_tcon *tcon,
3013 struct cifs_sb_info *cifs_sb, const char *full_path)
3016 FILE_ALL_INFO *pfile_info;
3018 pfile_info = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
3019 if (pfile_info == NULL)
3022 rc = CIFSSMBQPathInfo(xid, tcon, full_path, pfile_info,
3023 0 /* not legacy */, cifs_sb->local_nls,
3024 cifs_sb->mnt_cifs_flags &
3025 CIFS_MOUNT_MAP_SPECIAL_CHR);
3027 if (rc == -EOPNOTSUPP || rc == -EINVAL)
3028 rc = SMBQueryInformation(xid, tcon, full_path, pfile_info,
3029 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
3030 CIFS_MOUNT_MAP_SPECIAL_CHR);
3036 cleanup_volume_info_contents(struct smb_vol *volume_info)
3038 kfree(volume_info->username);
3039 kzfree(volume_info->password);
3040 if (volume_info->UNCip != volume_info->UNC + 2)
3041 kfree(volume_info->UNCip);
3042 kfree(volume_info->UNC);
3043 kfree(volume_info->domainname);
3044 kfree(volume_info->iocharset);
3045 kfree(volume_info->prepath);
3049 cifs_cleanup_volume_info(struct smb_vol *volume_info)
3053 cleanup_volume_info_contents(volume_info);
3058 #ifdef CONFIG_CIFS_DFS_UPCALL
3059 /* build_path_to_root returns full path to root when
3060 * we do not have an exiting connection (tcon) */
3062 build_unc_path_to_root(const struct smb_vol *vol,
3063 const struct cifs_sb_info *cifs_sb)
3065 char *full_path, *pos;
3066 unsigned int pplen = vol->prepath ? strlen(vol->prepath) : 0;
3067 unsigned int unc_len = strnlen(vol->UNC, MAX_TREE_SIZE + 1);
3069 full_path = kmalloc(unc_len + pplen + 1, GFP_KERNEL);
3070 if (full_path == NULL)
3071 return ERR_PTR(-ENOMEM);
3073 strncpy(full_path, vol->UNC, unc_len);
3074 pos = full_path + unc_len;
3077 strncpy(pos, vol->prepath, pplen);
3081 *pos = '\0'; /* add trailing null */
3082 convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
3083 cFYI(1, "%s: full_path=%s", __func__, full_path);
3088 * Perform a dfs referral query for a share and (optionally) prefix
3090 * If a referral is found, cifs_sb->mountdata will be (re-)allocated
3091 * to a string containing updated options for the submount. Otherwise it
3092 * will be left untouched.
3094 * Returns the rc from get_dfs_path to the caller, which can be used to
3095 * determine whether there were referrals.
3098 expand_dfs_referral(int xid, struct cifs_ses *pSesInfo,
3099 struct smb_vol *volume_info, struct cifs_sb_info *cifs_sb,
3103 unsigned int num_referrals = 0;
3104 struct dfs_info3_param *referrals = NULL;
3105 char *full_path = NULL, *ref_path = NULL, *mdata = NULL;
3107 full_path = build_unc_path_to_root(volume_info, cifs_sb);
3108 if (IS_ERR(full_path))
3109 return PTR_ERR(full_path);
3111 /* For DFS paths, skip the first '\' of the UNC */
3112 ref_path = check_prefix ? full_path + 1 : volume_info->UNC + 1;
3114 rc = get_dfs_path(xid, pSesInfo , ref_path, cifs_sb->local_nls,
3115 &num_referrals, &referrals,
3116 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
3118 if (!rc && num_referrals > 0) {
3119 char *fake_devname = NULL;
3121 mdata = cifs_compose_mount_options(cifs_sb->mountdata,
3122 full_path + 1, referrals,
3125 free_dfs_info_array(referrals, num_referrals);
3127 if (IS_ERR(mdata)) {
3128 rc = PTR_ERR(mdata);
3131 cleanup_volume_info_contents(volume_info);
3132 memset(volume_info, '\0', sizeof(*volume_info));
3133 rc = cifs_setup_volume_info(volume_info, mdata,
3136 kfree(fake_devname);
3137 kfree(cifs_sb->mountdata);
3138 cifs_sb->mountdata = mdata;
3146 cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
3147 const char *devname)
3151 if (cifs_parse_mount_options(mount_data, devname, volume_info))
3154 if (volume_info->nullauth) {
3155 cFYI(1, "null user");
3156 volume_info->username = kzalloc(1, GFP_KERNEL);
3157 if (volume_info->username == NULL)
3159 } else if (volume_info->username) {
3160 /* BB fixme parse for domain name here */
3161 cFYI(1, "Username: %s", volume_info->username);
3163 cifserror("No username specified");
3164 /* In userspace mount helper we can get user name from alternate
3165 locations such as env variables and files on disk */
3169 /* this is needed for ASCII cp to Unicode converts */
3170 if (volume_info->iocharset == NULL) {
3171 /* load_nls_default cannot return null */
3172 volume_info->local_nls = load_nls_default();
3174 volume_info->local_nls = load_nls(volume_info->iocharset);
3175 if (volume_info->local_nls == NULL) {
3176 cERROR(1, "CIFS mount error: iocharset %s not found",
3177 volume_info->iocharset);
3186 cifs_get_volume_info(char *mount_data, const char *devname)
3189 struct smb_vol *volume_info;
3191 volume_info = kzalloc(sizeof(struct smb_vol), GFP_KERNEL);
3193 return ERR_PTR(-ENOMEM);
3195 rc = cifs_setup_volume_info(volume_info, mount_data, devname);
3197 cifs_cleanup_volume_info(volume_info);
3198 volume_info = ERR_PTR(rc);
3204 /* make sure ra_pages is a multiple of rsize */
3205 static inline unsigned int
3206 cifs_ra_pages(struct cifs_sb_info *cifs_sb)
3209 unsigned int rsize_pages = cifs_sb->rsize / PAGE_CACHE_SIZE;
3211 if (rsize_pages >= default_backing_dev_info.ra_pages)
3212 return default_backing_dev_info.ra_pages;
3213 else if (rsize_pages == 0)
3216 reads = default_backing_dev_info.ra_pages / rsize_pages;
3217 return reads * rsize_pages;
3221 cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *volume_info)
3225 struct cifs_ses *pSesInfo;
3226 struct cifs_tcon *tcon;
3227 struct TCP_Server_Info *srvTcp;
3229 struct tcon_link *tlink;
3230 #ifdef CONFIG_CIFS_DFS_UPCALL
3231 int referral_walks_count = 0;
3234 rc = bdi_setup_and_register(&cifs_sb->bdi, "cifs", BDI_CAP_MAP_COPY);
3238 #ifdef CONFIG_CIFS_DFS_UPCALL
3240 /* cleanup activities if we're chasing a referral */
3241 if (referral_walks_count) {
3243 cifs_put_tcon(tcon);
3245 cifs_put_smb_ses(pSesInfo);
3258 /* get a reference to a tcp session */
3259 srvTcp = cifs_get_tcp_session(volume_info);
3260 if (IS_ERR(srvTcp)) {
3261 rc = PTR_ERR(srvTcp);
3262 bdi_destroy(&cifs_sb->bdi);
3266 /* get a reference to a SMB session */
3267 pSesInfo = cifs_get_smb_ses(srvTcp, volume_info);
3268 if (IS_ERR(pSesInfo)) {
3269 rc = PTR_ERR(pSesInfo);
3271 goto mount_fail_check;
3274 /* search for existing tcon to this server share */
3275 tcon = cifs_get_tcon(pSesInfo, volume_info);
3279 goto remote_path_check;
3282 /* tell server which Unix caps we support */
3283 if (tcon->ses->capabilities & CAP_UNIX) {
3284 /* reset of caps checks mount to see if unix extensions
3285 disabled for just this mount */
3286 reset_cifs_unix_caps(xid, tcon, cifs_sb, volume_info);
3287 if ((tcon->ses->server->tcpStatus == CifsNeedReconnect) &&
3288 (le64_to_cpu(tcon->fsUnixInfo.Capability) &
3289 CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)) {
3291 goto mount_fail_check;
3294 tcon->unix_ext = 0; /* server does not support them */
3296 /* do not care if following two calls succeed - informational */
3298 CIFSSMBQFSDeviceInfo(xid, tcon);
3299 CIFSSMBQFSAttributeInfo(xid, tcon);
3302 cifs_sb->wsize = cifs_negotiate_wsize(tcon, volume_info);
3303 cifs_sb->rsize = cifs_negotiate_rsize(tcon, volume_info);
3305 /* tune readahead according to rsize */
3306 cifs_sb->bdi.ra_pages = cifs_ra_pages(cifs_sb);
3309 #ifdef CONFIG_CIFS_DFS_UPCALL
3311 * Perform an unconditional check for whether there are DFS
3312 * referrals for this path without prefix, to provide support
3313 * for DFS referrals from w2k8 servers which don't seem to respond
3314 * with PATH_NOT_COVERED to requests that include the prefix.
3315 * Chase the referral if found, otherwise continue normally.
3317 if (referral_walks_count == 0) {
3318 int refrc = expand_dfs_referral(xid, pSesInfo, volume_info,
3321 referral_walks_count++;
3322 goto try_mount_again;
3327 /* check if a whole path is not remote */
3329 /* build_path_to_root works only when we have a valid tcon */
3330 full_path = cifs_build_path_to_root(volume_info, cifs_sb, tcon);
3331 if (full_path == NULL) {
3333 goto mount_fail_check;
3335 rc = is_path_accessible(xid, tcon, cifs_sb, full_path);
3336 if (rc != 0 && rc != -EREMOTE) {
3338 goto mount_fail_check;
3343 /* get referral if needed */
3344 if (rc == -EREMOTE) {
3345 #ifdef CONFIG_CIFS_DFS_UPCALL
3346 if (referral_walks_count > MAX_NESTED_LINKS) {
3348 * BB: when we implement proper loop detection,
3349 * we will remove this check. But now we need it
3350 * to prevent an indefinite loop if 'DFS tree' is
3351 * misconfigured (i.e. has loops).
3354 goto mount_fail_check;
3357 rc = expand_dfs_referral(xid, pSesInfo, volume_info, cifs_sb,
3361 referral_walks_count++;
3362 goto try_mount_again;
3364 goto mount_fail_check;
3365 #else /* No DFS support, return error on mount */
3371 goto mount_fail_check;
3373 /* now, hang the tcon off of the superblock */
3374 tlink = kzalloc(sizeof *tlink, GFP_KERNEL);
3375 if (tlink == NULL) {
3377 goto mount_fail_check;
3380 tlink->tl_uid = pSesInfo->linux_uid;
3381 tlink->tl_tcon = tcon;
3382 tlink->tl_time = jiffies;
3383 set_bit(TCON_LINK_MASTER, &tlink->tl_flags);
3384 set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3386 cifs_sb->master_tlink = tlink;
3387 spin_lock(&cifs_sb->tlink_tree_lock);
3388 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
3389 spin_unlock(&cifs_sb->tlink_tree_lock);
3391 queue_delayed_work(system_nrt_wq, &cifs_sb->prune_tlinks,
3395 /* on error free sesinfo and tcon struct if needed */
3397 /* If find_unc succeeded then rc == 0 so we can not end */
3398 /* up accidentally freeing someone elses tcon struct */
3400 cifs_put_tcon(tcon);
3402 cifs_put_smb_ses(pSesInfo);
3404 cifs_put_tcp_session(srvTcp);
3405 bdi_destroy(&cifs_sb->bdi);
3414 * Issue a TREE_CONNECT request. Note that for IPC$ shares, that the tcon
3415 * pointer may be NULL.
3418 CIFSTCon(unsigned int xid, struct cifs_ses *ses,
3419 const char *tree, struct cifs_tcon *tcon,
3420 const struct nls_table *nls_codepage)
3422 struct smb_hdr *smb_buffer;
3423 struct smb_hdr *smb_buffer_response;
3426 unsigned char *bcc_ptr;
3429 __u16 bytes_left, count;
3434 smb_buffer = cifs_buf_get();
3435 if (smb_buffer == NULL)
3438 smb_buffer_response = smb_buffer;
3440 header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
3441 NULL /*no tid */ , 4 /*wct */ );
3443 smb_buffer->Mid = GetNextMid(ses->server);
3444 smb_buffer->Uid = ses->Suid;
3445 pSMB = (TCONX_REQ *) smb_buffer;
3446 pSMBr = (TCONX_RSP *) smb_buffer_response;
3448 pSMB->AndXCommand = 0xFF;
3449 pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
3450 bcc_ptr = &pSMB->Password[0];
3451 if (!tcon || (ses->server->sec_mode & SECMODE_USER)) {
3452 pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
3453 *bcc_ptr = 0; /* password is null byte */
3454 bcc_ptr++; /* skip password */
3455 /* already aligned so no need to do it below */
3457 pSMB->PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
3458 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
3459 specified as required (when that support is added to
3460 the vfs in the future) as only NTLM or the much
3461 weaker LANMAN (which we do not send by default) is accepted
3462 by Samba (not sure whether other servers allow
3463 NTLMv2 password here) */
3464 #ifdef CONFIG_CIFS_WEAK_PW_HASH
3465 if ((global_secflags & CIFSSEC_MAY_LANMAN) &&
3466 (ses->server->secType == LANMAN))
3467 calc_lanman_hash(tcon->password, ses->server->cryptkey,
3468 ses->server->sec_mode &
3469 SECMODE_PW_ENCRYPT ? true : false,
3472 #endif /* CIFS_WEAK_PW_HASH */
3473 rc = SMBNTencrypt(tcon->password, ses->server->cryptkey,
3474 bcc_ptr, nls_codepage);
3476 bcc_ptr += CIFS_AUTH_RESP_SIZE;
3477 if (ses->capabilities & CAP_UNICODE) {
3478 /* must align unicode strings */
3479 *bcc_ptr = 0; /* null byte password */
3484 if (ses->server->sec_mode &
3485 (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
3486 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
3488 if (ses->capabilities & CAP_STATUS32) {
3489 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
3491 if (ses->capabilities & CAP_DFS) {
3492 smb_buffer->Flags2 |= SMBFLG2_DFS;
3494 if (ses->capabilities & CAP_UNICODE) {
3495 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
3497 cifs_strtoUCS((__le16 *) bcc_ptr, tree,
3498 6 /* max utf8 char length in bytes */ *
3499 (/* server len*/ + 256 /* share len */), nls_codepage);
3500 bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
3501 bcc_ptr += 2; /* skip trailing null */
3502 } else { /* ASCII */
3503 strcpy(bcc_ptr, tree);
3504 bcc_ptr += strlen(tree) + 1;
3506 strcpy(bcc_ptr, "?????");
3507 bcc_ptr += strlen("?????");
3509 count = bcc_ptr - &pSMB->Password[0];
3510 pSMB->hdr.smb_buf_length = cpu_to_be32(be32_to_cpu(
3511 pSMB->hdr.smb_buf_length) + count);
3512 pSMB->ByteCount = cpu_to_le16(count);
3514 rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
3517 /* above now done in SendReceive */
3518 if ((rc == 0) && (tcon != NULL)) {
3521 tcon->tidStatus = CifsGood;
3522 tcon->need_reconnect = false;
3523 tcon->tid = smb_buffer_response->Tid;
3524 bcc_ptr = pByteArea(smb_buffer_response);
3525 bytes_left = get_bcc(smb_buffer_response);
3526 length = strnlen(bcc_ptr, bytes_left - 2);
3527 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
3533 /* skip service field (NB: this field is always ASCII) */
3535 if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
3536 (bcc_ptr[2] == 'C')) {
3537 cFYI(1, "IPC connection");
3540 } else if (length == 2) {
3541 if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
3542 /* the most common case */
3543 cFYI(1, "disk share connection");
3546 bcc_ptr += length + 1;
3547 bytes_left -= (length + 1);
3548 strncpy(tcon->treeName, tree, MAX_TREE_SIZE);
3550 /* mostly informational -- no need to fail on error here */
3551 kfree(tcon->nativeFileSystem);
3552 tcon->nativeFileSystem = cifs_strndup_from_ucs(bcc_ptr,
3553 bytes_left, is_unicode,
3556 cFYI(1, "nativeFileSystem=%s", tcon->nativeFileSystem);
3558 if ((smb_buffer_response->WordCount == 3) ||
3559 (smb_buffer_response->WordCount == 7))
3560 /* field is in same location */
3561 tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
3564 cFYI(1, "Tcon flags: 0x%x ", tcon->Flags);
3565 } else if ((rc == 0) && tcon == NULL) {
3566 /* all we need to save for IPC$ connection */
3567 ses->ipc_tid = smb_buffer_response->Tid;
3570 cifs_buf_release(smb_buffer);
3575 cifs_umount(struct cifs_sb_info *cifs_sb)
3577 struct rb_root *root = &cifs_sb->tlink_tree;
3578 struct rb_node *node;
3579 struct tcon_link *tlink;
3581 cancel_delayed_work_sync(&cifs_sb->prune_tlinks);
3583 spin_lock(&cifs_sb->tlink_tree_lock);
3584 while ((node = rb_first(root))) {
3585 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
3586 cifs_get_tlink(tlink);
3587 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3588 rb_erase(node, root);
3590 spin_unlock(&cifs_sb->tlink_tree_lock);
3591 cifs_put_tlink(tlink);
3592 spin_lock(&cifs_sb->tlink_tree_lock);
3594 spin_unlock(&cifs_sb->tlink_tree_lock);
3596 bdi_destroy(&cifs_sb->bdi);
3597 kfree(cifs_sb->mountdata);
3598 unload_nls(cifs_sb->local_nls);
3602 int cifs_negotiate_protocol(unsigned int xid, struct cifs_ses *ses)
3605 struct TCP_Server_Info *server = ses->server;
3607 /* only send once per connect */
3608 if (server->maxBuf != 0)
3611 rc = CIFSSMBNegotiate(xid, ses);
3612 if (rc == -EAGAIN) {
3613 /* retry only once on 1st time connection */
3614 rc = CIFSSMBNegotiate(xid, ses);
3619 spin_lock(&GlobalMid_Lock);
3620 if (server->tcpStatus == CifsNeedNegotiate)
3621 server->tcpStatus = CifsGood;
3624 spin_unlock(&GlobalMid_Lock);
3632 int cifs_setup_session(unsigned int xid, struct cifs_ses *ses,
3633 struct nls_table *nls_info)
3636 struct TCP_Server_Info *server = ses->server;
3639 ses->capabilities = server->capabilities;
3640 if (linuxExtEnabled == 0)
3641 ses->capabilities &= (~CAP_UNIX);
3643 cFYI(1, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d",
3644 server->sec_mode, server->capabilities, server->timeAdj);
3646 rc = CIFS_SessSetup(xid, ses, nls_info);
3648 cERROR(1, "Send error in SessSetup = %d", rc);
3650 mutex_lock(&ses->server->srv_mutex);
3651 if (!server->session_estab) {
3652 server->session_key.response = ses->auth_key.response;
3653 server->session_key.len = ses->auth_key.len;
3654 server->sequence_number = 0x2;
3655 server->session_estab = true;
3656 ses->auth_key.response = NULL;
3658 mutex_unlock(&server->srv_mutex);
3660 cFYI(1, "CIFS Session Established successfully");
3661 spin_lock(&GlobalMid_Lock);
3662 ses->status = CifsGood;
3663 ses->need_reconnect = false;
3664 spin_unlock(&GlobalMid_Lock);
3667 kfree(ses->auth_key.response);
3668 ses->auth_key.response = NULL;
3669 ses->auth_key.len = 0;
3670 kfree(ses->ntlmssp);
3671 ses->ntlmssp = NULL;
3676 static struct cifs_tcon *
3677 cifs_construct_tcon(struct cifs_sb_info *cifs_sb, uid_t fsuid)
3679 struct cifs_tcon *master_tcon = cifs_sb_master_tcon(cifs_sb);
3680 struct cifs_ses *ses;
3681 struct cifs_tcon *tcon = NULL;
3682 struct smb_vol *vol_info;
3683 char username[28]; /* big enough for "krb50x" + hex of ULONG_MAX 6+16 */
3684 /* We used to have this as MAX_USERNAME which is */
3685 /* way too big now (256 instead of 32) */
3687 vol_info = kzalloc(sizeof(*vol_info), GFP_KERNEL);
3688 if (vol_info == NULL) {
3689 tcon = ERR_PTR(-ENOMEM);
3693 snprintf(username, sizeof(username), "krb50x%x", fsuid);
3694 vol_info->username = username;
3695 vol_info->local_nls = cifs_sb->local_nls;
3696 vol_info->linux_uid = fsuid;
3697 vol_info->cred_uid = fsuid;
3698 vol_info->UNC = master_tcon->treeName;
3699 vol_info->retry = master_tcon->retry;
3700 vol_info->nocase = master_tcon->nocase;
3701 vol_info->local_lease = master_tcon->local_lease;
3702 vol_info->no_linux_ext = !master_tcon->unix_ext;
3704 /* FIXME: allow for other secFlg settings */
3705 vol_info->secFlg = CIFSSEC_MUST_KRB5;
3707 /* get a reference for the same TCP session */
3708 spin_lock(&cifs_tcp_ses_lock);
3709 ++master_tcon->ses->server->srv_count;
3710 spin_unlock(&cifs_tcp_ses_lock);
3712 ses = cifs_get_smb_ses(master_tcon->ses->server, vol_info);
3714 tcon = (struct cifs_tcon *)ses;
3715 cifs_put_tcp_session(master_tcon->ses->server);
3719 tcon = cifs_get_tcon(ses, vol_info);
3721 cifs_put_smb_ses(ses);
3725 if (ses->capabilities & CAP_UNIX)
3726 reset_cifs_unix_caps(0, tcon, NULL, vol_info);
3734 cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
3736 return tlink_tcon(cifs_sb_master_tlink(cifs_sb));
3740 cifs_sb_tcon_pending_wait(void *unused)
3743 return signal_pending(current) ? -ERESTARTSYS : 0;
3746 /* find and return a tlink with given uid */
3747 static struct tcon_link *
3748 tlink_rb_search(struct rb_root *root, uid_t uid)
3750 struct rb_node *node = root->rb_node;
3751 struct tcon_link *tlink;
3754 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
3756 if (tlink->tl_uid > uid)
3757 node = node->rb_left;
3758 else if (tlink->tl_uid < uid)
3759 node = node->rb_right;
3766 /* insert a tcon_link into the tree */
3768 tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink)
3770 struct rb_node **new = &(root->rb_node), *parent = NULL;
3771 struct tcon_link *tlink;
3774 tlink = rb_entry(*new, struct tcon_link, tl_rbnode);
3777 if (tlink->tl_uid > new_tlink->tl_uid)
3778 new = &((*new)->rb_left);
3780 new = &((*new)->rb_right);
3783 rb_link_node(&new_tlink->tl_rbnode, parent, new);
3784 rb_insert_color(&new_tlink->tl_rbnode, root);
3788 * Find or construct an appropriate tcon given a cifs_sb and the fsuid of the
3791 * If the superblock doesn't refer to a multiuser mount, then just return
3792 * the master tcon for the mount.
3794 * First, search the rbtree for an existing tcon for this fsuid. If one
3795 * exists, then check to see if it's pending construction. If it is then wait
3796 * for construction to complete. Once it's no longer pending, check to see if
3797 * it failed and either return an error or retry construction, depending on
3800 * If one doesn't exist then insert a new tcon_link struct into the tree and
3801 * try to construct a new one.
3804 cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
3807 uid_t fsuid = current_fsuid();
3808 struct tcon_link *tlink, *newtlink;
3810 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
3811 return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
3813 spin_lock(&cifs_sb->tlink_tree_lock);
3814 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
3816 cifs_get_tlink(tlink);
3817 spin_unlock(&cifs_sb->tlink_tree_lock);
3819 if (tlink == NULL) {
3820 newtlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
3821 if (newtlink == NULL)
3822 return ERR_PTR(-ENOMEM);
3823 newtlink->tl_uid = fsuid;
3824 newtlink->tl_tcon = ERR_PTR(-EACCES);
3825 set_bit(TCON_LINK_PENDING, &newtlink->tl_flags);
3826 set_bit(TCON_LINK_IN_TREE, &newtlink->tl_flags);
3827 cifs_get_tlink(newtlink);
3829 spin_lock(&cifs_sb->tlink_tree_lock);
3830 /* was one inserted after previous search? */
3831 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
3833 cifs_get_tlink(tlink);
3834 spin_unlock(&cifs_sb->tlink_tree_lock);
3836 goto wait_for_construction;
3839 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
3840 spin_unlock(&cifs_sb->tlink_tree_lock);
3842 wait_for_construction:
3843 ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING,
3844 cifs_sb_tcon_pending_wait,
3845 TASK_INTERRUPTIBLE);
3847 cifs_put_tlink(tlink);
3848 return ERR_PTR(ret);
3851 /* if it's good, return it */
3852 if (!IS_ERR(tlink->tl_tcon))
3855 /* return error if we tried this already recently */
3856 if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) {
3857 cifs_put_tlink(tlink);
3858 return ERR_PTR(-EACCES);
3861 if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags))
3862 goto wait_for_construction;
3865 tlink->tl_tcon = cifs_construct_tcon(cifs_sb, fsuid);
3866 clear_bit(TCON_LINK_PENDING, &tlink->tl_flags);
3867 wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING);
3869 if (IS_ERR(tlink->tl_tcon)) {
3870 cifs_put_tlink(tlink);
3871 return ERR_PTR(-EACCES);
3878 * periodic workqueue job that scans tcon_tree for a superblock and closes
3882 cifs_prune_tlinks(struct work_struct *work)
3884 struct cifs_sb_info *cifs_sb = container_of(work, struct cifs_sb_info,
3886 struct rb_root *root = &cifs_sb->tlink_tree;
3887 struct rb_node *node = rb_first(root);
3888 struct rb_node *tmp;
3889 struct tcon_link *tlink;
3892 * Because we drop the spinlock in the loop in order to put the tlink
3893 * it's not guarded against removal of links from the tree. The only
3894 * places that remove entries from the tree are this function and
3895 * umounts. Because this function is non-reentrant and is canceled
3896 * before umount can proceed, this is safe.
3898 spin_lock(&cifs_sb->tlink_tree_lock);
3899 node = rb_first(root);
3900 while (node != NULL) {
3902 node = rb_next(tmp);
3903 tlink = rb_entry(tmp, struct tcon_link, tl_rbnode);
3905 if (test_bit(TCON_LINK_MASTER, &tlink->tl_flags) ||
3906 atomic_read(&tlink->tl_count) != 0 ||
3907 time_after(tlink->tl_time + TLINK_IDLE_EXPIRE, jiffies))
3910 cifs_get_tlink(tlink);
3911 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3912 rb_erase(tmp, root);
3914 spin_unlock(&cifs_sb->tlink_tree_lock);
3915 cifs_put_tlink(tlink);
3916 spin_lock(&cifs_sb->tlink_tree_lock);
3918 spin_unlock(&cifs_sb->tlink_tree_lock);
3920 queue_delayed_work(system_nrt_wq, &cifs_sb->prune_tlinks,