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 *pSMB2 = (struct smb_t2_rsp *)psecond;
229 struct smb_t2_rsp *pSMBt = (struct smb_t2_rsp *)pTargetSMB;
230 char *data_area_of_target;
231 char *data_area_of_buf2;
233 unsigned int byte_count, total_in_buf;
234 __u16 total_data_size, total_in_buf2;
236 total_data_size = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount);
238 if (total_data_size !=
239 get_unaligned_le16(&pSMB2->t2_rsp.TotalDataCount))
240 cFYI(1, "total data size of primary and secondary t2 differ");
242 total_in_buf = get_unaligned_le16(&pSMBt->t2_rsp.DataCount);
244 remaining = total_data_size - total_in_buf;
249 if (remaining == 0) /* nothing to do, ignore */
252 total_in_buf2 = get_unaligned_le16(&pSMB2->t2_rsp.DataCount);
253 if (remaining < total_in_buf2) {
254 cFYI(1, "transact2 2nd response contains too much data");
257 /* find end of first SMB data area */
258 data_area_of_target = (char *)&pSMBt->hdr.Protocol +
259 get_unaligned_le16(&pSMBt->t2_rsp.DataOffset);
260 /* validate target area */
262 data_area_of_buf2 = (char *)&pSMB2->hdr.Protocol +
263 get_unaligned_le16(&pSMB2->t2_rsp.DataOffset);
265 data_area_of_target += total_in_buf;
267 /* copy second buffer into end of first buffer */
268 total_in_buf += total_in_buf2;
269 /* is the result too big for the field? */
270 if (total_in_buf > USHRT_MAX)
272 put_unaligned_le16(total_in_buf, &pSMBt->t2_rsp.DataCount);
275 byte_count = get_bcc(pTargetSMB);
276 byte_count += total_in_buf2;
277 /* is the result too big for the field? */
278 if (byte_count > USHRT_MAX)
280 put_bcc(byte_count, pTargetSMB);
282 byte_count = be32_to_cpu(pTargetSMB->smb_buf_length);
283 byte_count += total_in_buf2;
284 /* don't allow buffer to overflow */
285 if (byte_count > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4)
287 pTargetSMB->smb_buf_length = cpu_to_be32(byte_count);
289 memcpy(data_area_of_target, data_area_of_buf2, total_in_buf2);
291 if (remaining == total_in_buf2) {
292 cFYI(1, "found the last secondary response");
293 return 0; /* we are done */
294 } else /* more responses to go */
299 cifs_echo_request(struct work_struct *work)
302 struct TCP_Server_Info *server = container_of(work,
303 struct TCP_Server_Info, echo.work);
306 * We cannot send an echo until the NEGOTIATE_PROTOCOL request is
307 * done, which is indicated by maxBuf != 0. Also, no need to ping if
308 * we got a response recently
310 if (server->maxBuf == 0 ||
311 time_before(jiffies, server->lstrp + SMB_ECHO_INTERVAL - HZ))
314 rc = CIFSSMBEcho(server);
316 cFYI(1, "Unable to send echo request to server: %s",
320 queue_delayed_work(system_nrt_wq, &server->echo, SMB_ECHO_INTERVAL);
324 allocate_buffers(struct TCP_Server_Info *server)
326 if (!server->bigbuf) {
327 server->bigbuf = (char *)cifs_buf_get();
328 if (!server->bigbuf) {
329 cERROR(1, "No memory for large SMB response");
331 /* retry will check if exiting */
334 } else if (server->large_buf) {
335 /* we are reusing a dirty large buf, clear its start */
336 memset(server->bigbuf, 0, sizeof(struct smb_hdr));
339 if (!server->smallbuf) {
340 server->smallbuf = (char *)cifs_small_buf_get();
341 if (!server->smallbuf) {
342 cERROR(1, "No memory for SMB response");
344 /* retry will check if exiting */
347 /* beginning of smb buffer is cleared in our buf_get */
349 /* if existing small buf clear beginning */
350 memset(server->smallbuf, 0, sizeof(struct smb_hdr));
357 server_unresponsive(struct TCP_Server_Info *server)
359 if (echo_retries > 0 && server->tcpStatus == CifsGood &&
360 time_after(jiffies, server->lstrp +
361 (echo_retries * SMB_ECHO_INTERVAL))) {
362 cERROR(1, "Server %s has not responded in %d seconds. "
363 "Reconnecting...", server->hostname,
364 (echo_retries * SMB_ECHO_INTERVAL / HZ));
365 cifs_reconnect(server);
366 wake_up(&server->response_q);
374 * kvec_array_init - clone a kvec array, and advance into it
375 * @new: pointer to memory for cloned array
376 * @iov: pointer to original array
377 * @nr_segs: number of members in original array
378 * @bytes: number of bytes to advance into the cloned array
380 * This function will copy the array provided in iov to a section of memory
381 * and advance the specified number of bytes into the new array. It returns
382 * the number of segments in the new array. "new" must be at least as big as
383 * the original iov array.
386 kvec_array_init(struct kvec *new, struct kvec *iov, unsigned int nr_segs,
391 while (bytes || !iov->iov_len) {
392 int copy = min(bytes, iov->iov_len);
396 if (iov->iov_len == base) {
402 memcpy(new, iov, sizeof(*iov) * nr_segs);
403 new->iov_base += base;
404 new->iov_len -= base;
409 get_server_iovec(struct TCP_Server_Info *server, unsigned int nr_segs)
411 struct kvec *new_iov;
413 if (server->iov && nr_segs <= server->nr_iov)
416 /* not big enough -- allocate a new one and release the old */
417 new_iov = kmalloc(sizeof(*new_iov) * nr_segs, GFP_NOFS);
420 server->iov = new_iov;
421 server->nr_iov = nr_segs;
427 cifs_readv_from_socket(struct TCP_Server_Info *server, struct kvec *iov_orig,
428 unsigned int nr_segs, unsigned int to_read)
433 struct msghdr smb_msg;
436 iov = get_server_iovec(server, nr_segs);
440 smb_msg.msg_control = NULL;
441 smb_msg.msg_controllen = 0;
443 for (total_read = 0; to_read; total_read += length, to_read -= length) {
446 if (server_unresponsive(server)) {
447 total_read = -EAGAIN;
451 segs = kvec_array_init(iov, iov_orig, nr_segs, total_read);
453 length = kernel_recvmsg(server->ssocket, &smb_msg,
454 iov, segs, to_read, 0);
456 if (server->tcpStatus == CifsExiting) {
457 total_read = -ESHUTDOWN;
459 } else if (server->tcpStatus == CifsNeedReconnect) {
460 cifs_reconnect(server);
461 total_read = -EAGAIN;
463 } else if (length == -ERESTARTSYS ||
467 * Minimum sleep to prevent looping, allowing socket
468 * to clear and app threads to set tcpStatus
469 * CifsNeedReconnect if server hung.
471 usleep_range(1000, 2000);
474 } else if (length <= 0) {
475 cFYI(1, "Received no data or error: expecting %d "
476 "got %d", to_read, length);
477 cifs_reconnect(server);
478 total_read = -EAGAIN;
486 cifs_read_from_socket(struct TCP_Server_Info *server, char *buf,
487 unsigned int to_read)
492 iov.iov_len = to_read;
494 return cifs_readv_from_socket(server, &iov, 1, to_read);
498 is_smb_response(struct TCP_Server_Info *server, unsigned char type)
501 * The first byte big endian of the length field,
502 * is actually not part of the length but the type
503 * with the most common, zero, as regular data.
506 case RFC1002_SESSION_MESSAGE:
507 /* Regular SMB response */
509 case RFC1002_SESSION_KEEP_ALIVE:
510 cFYI(1, "RFC 1002 session keep alive");
512 case RFC1002_POSITIVE_SESSION_RESPONSE:
513 cFYI(1, "RFC 1002 positive session response");
515 case RFC1002_NEGATIVE_SESSION_RESPONSE:
517 * We get this from Windows 98 instead of an error on
518 * SMB negprot response.
520 cFYI(1, "RFC 1002 negative session response");
521 /* give server a second to clean up */
524 * Always try 445 first on reconnect since we get NACK
525 * on some if we ever connected to port 139 (the NACK
526 * is since we do not begin with RFC1001 session
529 cifs_set_port((struct sockaddr *)&server->dstaddr, CIFS_PORT);
530 cifs_reconnect(server);
531 wake_up(&server->response_q);
534 cERROR(1, "RFC 1002 unknown response type 0x%x", type);
535 cifs_reconnect(server);
541 static struct mid_q_entry *
542 find_mid(struct TCP_Server_Info *server, struct smb_hdr *buf)
544 struct mid_q_entry *mid;
546 spin_lock(&GlobalMid_Lock);
547 list_for_each_entry(mid, &server->pending_mid_q, qhead) {
548 if (mid->mid == buf->Mid &&
549 mid->midState == MID_REQUEST_SUBMITTED &&
550 mid->command == buf->Command) {
551 spin_unlock(&GlobalMid_Lock);
555 spin_unlock(&GlobalMid_Lock);
560 dequeue_mid(struct mid_q_entry *mid, bool malformed)
562 #ifdef CONFIG_CIFS_STATS2
563 mid->when_received = jiffies;
565 spin_lock(&GlobalMid_Lock);
567 mid->midState = MID_RESPONSE_RECEIVED;
569 mid->midState = MID_RESPONSE_MALFORMED;
570 list_del_init(&mid->qhead);
571 spin_unlock(&GlobalMid_Lock);
575 handle_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server,
576 struct smb_hdr *buf, int malformed)
578 if (malformed == 0 && check2ndT2(buf) > 0) {
579 mid->multiRsp = true;
581 /* merge response - fix up 1st*/
582 malformed = coalesce_t2(buf, mid->resp_buf);
586 /* All parts received or packet is malformed. */
587 mid->multiEnd = true;
588 return dequeue_mid(mid, malformed);
590 if (!server->large_buf) {
591 /*FIXME: switch to already allocated largebuf?*/
592 cERROR(1, "1st trans2 resp needs bigbuf");
594 /* Have first buffer */
596 mid->largeBuf = true;
597 server->bigbuf = NULL;
602 mid->largeBuf = server->large_buf;
603 /* Was previous buf put in mpx struct for multi-rsp? */
604 if (!mid->multiRsp) {
605 /* smb buffer will be freed by user thread */
606 if (server->large_buf)
607 server->bigbuf = NULL;
609 server->smallbuf = NULL;
611 dequeue_mid(mid, malformed);
614 static void clean_demultiplex_info(struct TCP_Server_Info *server)
618 /* take it off the list, if it's not already */
619 spin_lock(&cifs_tcp_ses_lock);
620 list_del_init(&server->tcp_ses_list);
621 spin_unlock(&cifs_tcp_ses_lock);
623 spin_lock(&GlobalMid_Lock);
624 server->tcpStatus = CifsExiting;
625 spin_unlock(&GlobalMid_Lock);
626 wake_up_all(&server->response_q);
629 * Check if we have blocked requests that need to free. Note that
630 * cifs_max_pending is normally 50, but can be set at module install
631 * time to as little as two.
633 spin_lock(&GlobalMid_Lock);
634 if (atomic_read(&server->inFlight) >= cifs_max_pending)
635 atomic_set(&server->inFlight, cifs_max_pending - 1);
637 * We do not want to set the max_pending too low or we could end up
638 * with the counter going negative.
640 spin_unlock(&GlobalMid_Lock);
642 * Although there should not be any requests blocked on this queue it
643 * can not hurt to be paranoid and try to wake up requests that may
644 * haven been blocked when more than 50 at time were on the wire to the
645 * same server - they now will see the session is in exit state and get
646 * out of SendReceive.
648 wake_up_all(&server->request_q);
649 /* give those requests time to exit */
652 if (server->ssocket) {
653 sock_release(server->ssocket);
654 server->ssocket = NULL;
657 if (!list_empty(&server->pending_mid_q)) {
658 struct list_head dispose_list;
659 struct mid_q_entry *mid_entry;
660 struct list_head *tmp, *tmp2;
662 INIT_LIST_HEAD(&dispose_list);
663 spin_lock(&GlobalMid_Lock);
664 list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
665 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
666 cFYI(1, "Clearing mid 0x%x", mid_entry->mid);
667 mid_entry->midState = MID_SHUTDOWN;
668 list_move(&mid_entry->qhead, &dispose_list);
670 spin_unlock(&GlobalMid_Lock);
672 /* now walk dispose list and issue callbacks */
673 list_for_each_safe(tmp, tmp2, &dispose_list) {
674 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
675 cFYI(1, "Callback mid 0x%x", mid_entry->mid);
676 list_del_init(&mid_entry->qhead);
677 mid_entry->callback(mid_entry);
679 /* 1/8th of sec is more than enough time for them to exit */
683 if (!list_empty(&server->pending_mid_q)) {
685 * mpx threads have not exited yet give them at least the smb
686 * send timeout time for long ops.
688 * Due to delays on oplock break requests, we need to wait at
689 * least 45 seconds before giving up on a request getting a
690 * response and going ahead and killing cifsd.
692 cFYI(1, "Wait for exit from demultiplex thread");
695 * If threads still have not exited they are probably never
696 * coming home not much else we can do but free the memory.
700 kfree(server->hostname);
704 length = atomic_dec_return(&tcpSesAllocCount);
706 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
711 standard_receive3(struct TCP_Server_Info *server, struct mid_q_entry *mid)
714 char *buf = server->smallbuf;
715 struct smb_hdr *smb_buffer = (struct smb_hdr *)buf;
716 unsigned int pdu_length = be32_to_cpu(smb_buffer->smb_buf_length);
718 /* make sure this will fit in a large buffer */
719 if (pdu_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {
720 cERROR(1, "SMB response too long (%u bytes)",
722 cifs_reconnect(server);
723 wake_up(&server->response_q);
727 /* switch to large buffer if too big for a small one */
728 if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
729 server->large_buf = true;
730 memcpy(server->bigbuf, server->smallbuf, server->total_read);
731 buf = server->bigbuf;
732 smb_buffer = (struct smb_hdr *)buf;
735 /* now read the rest */
736 length = cifs_read_from_socket(server,
737 buf + sizeof(struct smb_hdr) - 1,
738 pdu_length - sizeof(struct smb_hdr) + 1 + 4);
741 server->total_read += length;
743 dump_smb(smb_buffer, server->total_read);
746 * We know that we received enough to get to the MID as we
747 * checked the pdu_length earlier. Now check to see
748 * if the rest of the header is OK. We borrow the length
749 * var for the rest of the loop to avoid a new stack var.
751 * 48 bytes is enough to display the header and a little bit
752 * into the payload for debugging purposes.
754 length = checkSMB(smb_buffer, smb_buffer->Mid, server->total_read);
756 cifs_dump_mem("Bad SMB: ", buf,
757 min_t(unsigned int, server->total_read, 48));
760 handle_mid(mid, server, smb_buffer, length);
766 cifs_demultiplex_thread(void *p)
769 struct TCP_Server_Info *server = p;
770 unsigned int pdu_length;
772 struct smb_hdr *smb_buffer = NULL;
773 struct task_struct *task_to_wake = NULL;
774 struct mid_q_entry *mid_entry;
776 current->flags |= PF_MEMALLOC;
777 cFYI(1, "Demultiplex PID: %d", task_pid_nr(current));
779 length = atomic_inc_return(&tcpSesAllocCount);
781 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
785 while (server->tcpStatus != CifsExiting) {
789 if (!allocate_buffers(server))
792 server->large_buf = false;
793 smb_buffer = (struct smb_hdr *)server->smallbuf;
794 buf = server->smallbuf;
795 pdu_length = 4; /* enough to get RFC1001 header */
797 length = cifs_read_from_socket(server, buf, pdu_length);
800 server->total_read = length;
803 * The right amount was read from socket - 4 bytes,
804 * so we can now interpret the length field.
806 pdu_length = be32_to_cpu(smb_buffer->smb_buf_length);
808 cFYI(1, "RFC1002 header 0x%x", pdu_length);
809 if (!is_smb_response(server, buf[0]))
812 /* make sure we have enough to get to the MID */
813 if (pdu_length < sizeof(struct smb_hdr) - 1 - 4) {
814 cERROR(1, "SMB response too short (%u bytes)",
816 cifs_reconnect(server);
817 wake_up(&server->response_q);
821 /* read down to the MID */
822 length = cifs_read_from_socket(server, buf + 4,
823 sizeof(struct smb_hdr) - 1 - 4);
826 server->total_read += length;
828 mid_entry = find_mid(server, smb_buffer);
830 if (!mid_entry || !mid_entry->receive)
831 length = standard_receive3(server, mid_entry);
833 length = mid_entry->receive(server, mid_entry);
838 if (server->large_buf) {
839 buf = server->bigbuf;
840 smb_buffer = (struct smb_hdr *)buf;
843 server->lstrp = jiffies;
844 if (mid_entry != NULL) {
845 if (!mid_entry->multiRsp || mid_entry->multiEnd)
846 mid_entry->callback(mid_entry);
847 } else if (!is_valid_oplock_break(smb_buffer, server)) {
848 cERROR(1, "No task to wake, unknown frame received! "
849 "NumMids %d", atomic_read(&midCount));
850 cifs_dump_mem("Received Data is: ", buf,
851 sizeof(struct smb_hdr));
852 #ifdef CONFIG_CIFS_DEBUG2
853 cifs_dump_detail(smb_buffer);
854 cifs_dump_mids(server);
855 #endif /* CIFS_DEBUG2 */
858 } /* end while !EXITING */
860 /* buffer usually freed in free_mid - need to free it here on exit */
861 cifs_buf_release(server->bigbuf);
862 if (server->smallbuf) /* no sense logging a debug message if NULL */
863 cifs_small_buf_release(server->smallbuf);
865 task_to_wake = xchg(&server->tsk, NULL);
866 clean_demultiplex_info(server);
868 /* if server->tsk was NULL then wait for a signal before exiting */
870 set_current_state(TASK_INTERRUPTIBLE);
871 while (!signal_pending(current)) {
873 set_current_state(TASK_INTERRUPTIBLE);
875 set_current_state(TASK_RUNNING);
878 module_put_and_exit(0);
881 /* extract the host portion of the UNC string */
883 extract_hostname(const char *unc)
889 /* skip double chars at beginning of string */
890 /* BB: check validity of these bytes? */
893 /* delimiter between hostname and sharename is always '\\' now */
894 delim = strchr(src, '\\');
896 return ERR_PTR(-EINVAL);
899 dst = kmalloc((len + 1), GFP_KERNEL);
901 return ERR_PTR(-ENOMEM);
903 memcpy(dst, src, len);
910 cifs_parse_mount_options(const char *mountdata, const char *devname,
913 char *value, *data, *end;
914 char *mountdata_copy = NULL, *options;
916 unsigned int temp_len, i, j;
918 short int override_uid = -1;
919 short int override_gid = -1;
920 bool uid_specified = false;
921 bool gid_specified = false;
922 char *nodename = utsname()->nodename;
928 * does not have to be perfect mapping since field is
929 * informational, only used for servers that do not support
930 * port 445 and it can be overridden at mount time
932 memset(vol->source_rfc1001_name, 0x20, RFC1001_NAME_LEN);
933 for (i = 0; i < strnlen(nodename, RFC1001_NAME_LEN); i++)
934 vol->source_rfc1001_name[i] = toupper(nodename[i]);
936 vol->source_rfc1001_name[RFC1001_NAME_LEN] = 0;
937 /* null target name indicates to use *SMBSERVR default called name
938 if we end up sending RFC1001 session initialize */
939 vol->target_rfc1001_name[0] = 0;
940 vol->cred_uid = current_uid();
941 vol->linux_uid = current_uid();
942 vol->linux_gid = current_gid();
944 /* default to only allowing write access to owner of the mount */
945 vol->dir_mode = vol->file_mode = S_IRUGO | S_IXUGO | S_IWUSR;
947 /* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */
948 /* default is always to request posix paths. */
949 vol->posix_paths = 1;
950 /* default to using server inode numbers where available */
953 vol->actimeo = CIFS_DEF_ACTIMEO;
956 goto cifs_parse_mount_err;
958 mountdata_copy = kstrndup(mountdata, PAGE_SIZE, GFP_KERNEL);
960 goto cifs_parse_mount_err;
962 options = mountdata_copy;
963 end = options + strlen(options);
964 if (strncmp(options, "sep=", 4) == 0) {
965 if (options[4] != 0) {
966 separator[0] = options[4];
969 cFYI(1, "Null separator not allowed");
972 vol->backupuid_specified = false; /* no backup intent for a user */
973 vol->backupgid_specified = false; /* no backup intent for a group */
975 while ((data = strsep(&options, separator)) != NULL) {
978 if ((value = strchr(data, '=')) != NULL)
981 /* Have to parse this before we parse for "user" */
982 if (strnicmp(data, "user_xattr", 10) == 0) {
984 } else if (strnicmp(data, "nouser_xattr", 12) == 0) {
986 } else if (strnicmp(data, "user", 4) == 0) {
989 "CIFS: invalid or missing username\n");
990 goto cifs_parse_mount_err;
991 } else if (!*value) {
992 /* null user, ie anonymous, authentication */
995 if (strnlen(value, MAX_USERNAME_SIZE) <
997 vol->username = kstrdup(value, GFP_KERNEL);
998 if (!vol->username) {
999 printk(KERN_WARNING "CIFS: no memory "
1001 goto cifs_parse_mount_err;
1004 printk(KERN_WARNING "CIFS: username too long\n");
1005 goto cifs_parse_mount_err;
1007 } else if (strnicmp(data, "pass", 4) == 0) {
1009 vol->password = NULL;
1011 } else if (value[0] == 0) {
1012 /* check if string begins with double comma
1013 since that would mean the password really
1014 does start with a comma, and would not
1015 indicate an empty string */
1016 if (value[1] != separator[0]) {
1017 vol->password = NULL;
1021 temp_len = strlen(value);
1022 /* removed password length check, NTLM passwords
1023 can be arbitrarily long */
1025 /* if comma in password, the string will be
1026 prematurely null terminated. Commas in password are
1027 specified across the cifs mount interface by a double
1028 comma ie ,, and a comma used as in other cases ie ','
1029 as a parameter delimiter/separator is single and due
1030 to the strsep above is temporarily zeroed. */
1032 /* NB: password legally can have multiple commas and
1033 the only illegal character in a password is null */
1035 if ((value[temp_len] == 0) &&
1036 (value + temp_len < end) &&
1037 (value[temp_len+1] == separator[0])) {
1038 /* reinsert comma */
1039 value[temp_len] = separator[0];
1040 temp_len += 2; /* move after second comma */
1041 while (value[temp_len] != 0) {
1042 if (value[temp_len] == separator[0]) {
1043 if (value[temp_len+1] ==
1045 /* skip second comma */
1048 /* single comma indicating start
1055 if (value[temp_len] == 0) {
1058 value[temp_len] = 0;
1059 /* point option to start of next parm */
1060 options = value + temp_len + 1;
1062 /* go from value to value + temp_len condensing
1063 double commas to singles. Note that this ends up
1064 allocating a few bytes too many, which is ok */
1065 vol->password = kzalloc(temp_len, GFP_KERNEL);
1066 if (vol->password == NULL) {
1067 printk(KERN_WARNING "CIFS: no memory "
1069 goto cifs_parse_mount_err;
1071 for (i = 0, j = 0; i < temp_len; i++, j++) {
1072 vol->password[j] = value[i];
1073 if (value[i] == separator[0]
1074 && value[i+1] == separator[0]) {
1075 /* skip second comma */
1079 vol->password[j] = 0;
1081 vol->password = kzalloc(temp_len+1, GFP_KERNEL);
1082 if (vol->password == NULL) {
1083 printk(KERN_WARNING "CIFS: no memory "
1085 goto cifs_parse_mount_err;
1087 strcpy(vol->password, value);
1089 } else if (!strnicmp(data, "ip", 2) ||
1090 !strnicmp(data, "addr", 4)) {
1091 if (!value || !*value) {
1093 } else if (strnlen(value, INET6_ADDRSTRLEN) <
1095 vol->UNCip = kstrdup(value, GFP_KERNEL);
1097 printk(KERN_WARNING "CIFS: no memory "
1099 goto cifs_parse_mount_err;
1102 printk(KERN_WARNING "CIFS: ip address "
1104 goto cifs_parse_mount_err;
1106 } else if (strnicmp(data, "sec", 3) == 0) {
1107 if (!value || !*value) {
1108 cERROR(1, "no security value specified");
1110 } else if (strnicmp(value, "krb5i", 5) == 0) {
1111 vol->secFlg |= CIFSSEC_MAY_KRB5 |
1113 } else if (strnicmp(value, "krb5p", 5) == 0) {
1114 /* vol->secFlg |= CIFSSEC_MUST_SEAL |
1115 CIFSSEC_MAY_KRB5; */
1116 cERROR(1, "Krb5 cifs privacy not supported");
1117 goto cifs_parse_mount_err;
1118 } else if (strnicmp(value, "krb5", 4) == 0) {
1119 vol->secFlg |= CIFSSEC_MAY_KRB5;
1120 } else if (strnicmp(value, "ntlmsspi", 8) == 0) {
1121 vol->secFlg |= CIFSSEC_MAY_NTLMSSP |
1123 } else if (strnicmp(value, "ntlmssp", 7) == 0) {
1124 vol->secFlg |= CIFSSEC_MAY_NTLMSSP;
1125 } else if (strnicmp(value, "ntlmv2i", 7) == 0) {
1126 vol->secFlg |= CIFSSEC_MAY_NTLMV2 |
1128 } else if (strnicmp(value, "ntlmv2", 6) == 0) {
1129 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
1130 } else if (strnicmp(value, "ntlmi", 5) == 0) {
1131 vol->secFlg |= CIFSSEC_MAY_NTLM |
1133 } else if (strnicmp(value, "ntlm", 4) == 0) {
1134 /* ntlm is default so can be turned off too */
1135 vol->secFlg |= CIFSSEC_MAY_NTLM;
1136 } else if (strnicmp(value, "nontlm", 6) == 0) {
1137 /* BB is there a better way to do this? */
1138 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
1139 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1140 } else if (strnicmp(value, "lanman", 6) == 0) {
1141 vol->secFlg |= CIFSSEC_MAY_LANMAN;
1143 } else if (strnicmp(value, "none", 4) == 0) {
1146 cERROR(1, "bad security option: %s", value);
1147 goto cifs_parse_mount_err;
1149 } else if (strnicmp(data, "vers", 3) == 0) {
1150 if (!value || !*value) {
1151 cERROR(1, "no protocol version specified"
1152 " after vers= mount option");
1153 } else if ((strnicmp(value, "cifs", 4) == 0) ||
1154 (strnicmp(value, "1", 1) == 0)) {
1155 /* this is the default */
1158 } else if ((strnicmp(data, "unc", 3) == 0)
1159 || (strnicmp(data, "target", 6) == 0)
1160 || (strnicmp(data, "path", 4) == 0)) {
1161 if (!value || !*value) {
1162 printk(KERN_WARNING "CIFS: invalid path to "
1163 "network resource\n");
1164 goto cifs_parse_mount_err;
1166 if ((temp_len = strnlen(value, 300)) < 300) {
1167 vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
1168 if (vol->UNC == NULL)
1169 goto cifs_parse_mount_err;
1170 strcpy(vol->UNC, value);
1171 if (strncmp(vol->UNC, "//", 2) == 0) {
1174 } else if (strncmp(vol->UNC, "\\\\", 2) != 0) {
1176 "CIFS: UNC Path does not begin "
1177 "with // or \\\\ \n");
1178 goto cifs_parse_mount_err;
1181 printk(KERN_WARNING "CIFS: UNC name too long\n");
1182 goto cifs_parse_mount_err;
1184 } else if ((strnicmp(data, "domain", 3) == 0)
1185 || (strnicmp(data, "workgroup", 5) == 0)) {
1186 if (!value || !*value) {
1187 printk(KERN_WARNING "CIFS: invalid domain name\n");
1188 goto cifs_parse_mount_err;
1190 /* BB are there cases in which a comma can be valid in
1191 a domain name and need special handling? */
1192 if (strnlen(value, 256) < 256) {
1193 vol->domainname = kstrdup(value, GFP_KERNEL);
1194 if (!vol->domainname) {
1195 printk(KERN_WARNING "CIFS: no memory "
1196 "for domainname\n");
1197 goto cifs_parse_mount_err;
1199 cFYI(1, "Domain name set");
1201 printk(KERN_WARNING "CIFS: domain name too "
1203 goto cifs_parse_mount_err;
1205 } else if (strnicmp(data, "srcaddr", 7) == 0) {
1206 vol->srcaddr.ss_family = AF_UNSPEC;
1208 if (!value || !*value) {
1209 printk(KERN_WARNING "CIFS: srcaddr value"
1210 " not specified.\n");
1211 goto cifs_parse_mount_err;
1213 i = cifs_convert_address((struct sockaddr *)&vol->srcaddr,
1214 value, strlen(value));
1216 printk(KERN_WARNING "CIFS: Could not parse"
1219 goto cifs_parse_mount_err;
1221 } else if (strnicmp(data, "prefixpath", 10) == 0) {
1222 if (!value || !*value) {
1224 "CIFS: invalid path prefix\n");
1225 goto cifs_parse_mount_err;
1227 if ((temp_len = strnlen(value, 1024)) < 1024) {
1228 if (value[0] != '/')
1229 temp_len++; /* missing leading slash */
1230 vol->prepath = kmalloc(temp_len+1, GFP_KERNEL);
1231 if (vol->prepath == NULL)
1232 goto cifs_parse_mount_err;
1233 if (value[0] != '/') {
1234 vol->prepath[0] = '/';
1235 strcpy(vol->prepath+1, value);
1237 strcpy(vol->prepath, value);
1238 cFYI(1, "prefix path %s", vol->prepath);
1240 printk(KERN_WARNING "CIFS: prefix too long\n");
1241 goto cifs_parse_mount_err;
1243 } else if (strnicmp(data, "iocharset", 9) == 0) {
1244 if (!value || !*value) {
1245 printk(KERN_WARNING "CIFS: invalid iocharset "
1247 goto cifs_parse_mount_err;
1249 if (strnlen(value, 65) < 65) {
1250 if (strnicmp(value, "default", 7)) {
1251 vol->iocharset = kstrdup(value,
1254 if (!vol->iocharset) {
1255 printk(KERN_WARNING "CIFS: no "
1258 goto cifs_parse_mount_err;
1261 /* if iocharset not set then load_nls_default
1262 is used by caller */
1263 cFYI(1, "iocharset set to %s", value);
1265 printk(KERN_WARNING "CIFS: iocharset name "
1267 goto cifs_parse_mount_err;
1269 } else if (!strnicmp(data, "uid", 3) && value && *value) {
1270 vol->linux_uid = simple_strtoul(value, &value, 0);
1271 uid_specified = true;
1272 } else if (!strnicmp(data, "cruid", 5) && value && *value) {
1273 vol->cred_uid = simple_strtoul(value, &value, 0);
1274 } else if (!strnicmp(data, "forceuid", 8)) {
1276 } else if (!strnicmp(data, "noforceuid", 10)) {
1278 } else if (!strnicmp(data, "gid", 3) && value && *value) {
1279 vol->linux_gid = simple_strtoul(value, &value, 0);
1280 gid_specified = true;
1281 } else if (!strnicmp(data, "forcegid", 8)) {
1283 } else if (!strnicmp(data, "noforcegid", 10)) {
1285 } else if (strnicmp(data, "file_mode", 4) == 0) {
1286 if (value && *value) {
1288 simple_strtoul(value, &value, 0);
1290 } else if (strnicmp(data, "dir_mode", 4) == 0) {
1291 if (value && *value) {
1293 simple_strtoul(value, &value, 0);
1295 } else if (strnicmp(data, "dirmode", 4) == 0) {
1296 if (value && *value) {
1298 simple_strtoul(value, &value, 0);
1300 } else if (strnicmp(data, "port", 4) == 0) {
1301 if (value && *value) {
1303 simple_strtoul(value, &value, 0);
1305 } else if (strnicmp(data, "rsize", 5) == 0) {
1306 if (value && *value) {
1308 simple_strtoul(value, &value, 0);
1310 } else if (strnicmp(data, "wsize", 5) == 0) {
1311 if (value && *value) {
1313 simple_strtoul(value, &value, 0);
1315 } else if (strnicmp(data, "sockopt", 5) == 0) {
1316 if (!value || !*value) {
1317 cERROR(1, "no socket option specified");
1319 } else if (strnicmp(value, "TCP_NODELAY", 11) == 0) {
1320 vol->sockopt_tcp_nodelay = 1;
1322 } else if (strnicmp(data, "netbiosname", 4) == 0) {
1323 if (!value || !*value || (*value == ' ')) {
1324 cFYI(1, "invalid (empty) netbiosname");
1326 memset(vol->source_rfc1001_name, 0x20,
1329 * FIXME: are there cases in which a comma can
1330 * be valid in workstation netbios name (and
1331 * need special handling)?
1333 for (i = 0; i < RFC1001_NAME_LEN; i++) {
1334 /* don't ucase netbiosname for user */
1337 vol->source_rfc1001_name[i] = value[i];
1339 /* The string has 16th byte zero still from
1340 set at top of the function */
1341 if (i == RFC1001_NAME_LEN && value[i] != 0)
1342 printk(KERN_WARNING "CIFS: netbiosname"
1343 " longer than 15 truncated.\n");
1345 } else if (strnicmp(data, "servern", 7) == 0) {
1346 /* servernetbiosname specified override *SMBSERVER */
1347 if (!value || !*value || (*value == ' ')) {
1348 cFYI(1, "empty server netbiosname specified");
1350 /* last byte, type, is 0x20 for servr type */
1351 memset(vol->target_rfc1001_name, 0x20,
1352 RFC1001_NAME_LEN_WITH_NULL);
1354 for (i = 0; i < 15; i++) {
1355 /* BB are there cases in which a comma can be
1356 valid in this workstation netbios name
1357 (and need special handling)? */
1359 /* user or mount helper must uppercase
1364 vol->target_rfc1001_name[i] =
1367 /* The string has 16th byte zero still from
1368 set at top of the function */
1369 if (i == RFC1001_NAME_LEN && value[i] != 0)
1370 printk(KERN_WARNING "CIFS: server net"
1371 "biosname longer than 15 truncated.\n");
1373 } else if (strnicmp(data, "actimeo", 7) == 0) {
1374 if (value && *value) {
1375 vol->actimeo = HZ * simple_strtoul(value,
1377 if (vol->actimeo > CIFS_MAX_ACTIMEO) {
1378 cERROR(1, "CIFS: attribute cache"
1379 "timeout too large");
1380 goto cifs_parse_mount_err;
1383 } else if (strnicmp(data, "credentials", 4) == 0) {
1385 } else if (strnicmp(data, "version", 3) == 0) {
1387 } else if (strnicmp(data, "guest", 5) == 0) {
1389 } else if (strnicmp(data, "rw", 2) == 0 && strlen(data) == 2) {
1391 } else if (strnicmp(data, "ro", 2) == 0) {
1393 } else if (strnicmp(data, "noblocksend", 11) == 0) {
1394 vol->noblocksnd = 1;
1395 } else if (strnicmp(data, "noautotune", 10) == 0) {
1396 vol->noautotune = 1;
1397 } else if ((strnicmp(data, "suid", 4) == 0) ||
1398 (strnicmp(data, "nosuid", 6) == 0) ||
1399 (strnicmp(data, "exec", 4) == 0) ||
1400 (strnicmp(data, "noexec", 6) == 0) ||
1401 (strnicmp(data, "nodev", 5) == 0) ||
1402 (strnicmp(data, "noauto", 6) == 0) ||
1403 (strnicmp(data, "dev", 3) == 0)) {
1404 /* The mount tool or mount.cifs helper (if present)
1405 uses these opts to set flags, and the flags are read
1406 by the kernel vfs layer before we get here (ie
1407 before read super) so there is no point trying to
1408 parse these options again and set anything and it
1409 is ok to just ignore them */
1411 } else if (strnicmp(data, "hard", 4) == 0) {
1413 } else if (strnicmp(data, "soft", 4) == 0) {
1415 } else if (strnicmp(data, "perm", 4) == 0) {
1417 } else if (strnicmp(data, "noperm", 6) == 0) {
1419 } else if (strnicmp(data, "mapchars", 8) == 0) {
1421 } else if (strnicmp(data, "nomapchars", 10) == 0) {
1423 } else if (strnicmp(data, "sfu", 3) == 0) {
1425 } else if (strnicmp(data, "nosfu", 5) == 0) {
1427 } else if (strnicmp(data, "nodfs", 5) == 0) {
1429 } else if (strnicmp(data, "posixpaths", 10) == 0) {
1430 vol->posix_paths = 1;
1431 } else if (strnicmp(data, "noposixpaths", 12) == 0) {
1432 vol->posix_paths = 0;
1433 } else if (strnicmp(data, "nounix", 6) == 0) {
1434 vol->no_linux_ext = 1;
1435 } else if (strnicmp(data, "nolinux", 7) == 0) {
1436 vol->no_linux_ext = 1;
1437 } else if ((strnicmp(data, "nocase", 6) == 0) ||
1438 (strnicmp(data, "ignorecase", 10) == 0)) {
1440 } else if (strnicmp(data, "mand", 4) == 0) {
1442 } else if (strnicmp(data, "nomand", 6) == 0) {
1444 } else if (strnicmp(data, "_netdev", 7) == 0) {
1446 } else if (strnicmp(data, "brl", 3) == 0) {
1448 } else if ((strnicmp(data, "nobrl", 5) == 0) ||
1449 (strnicmp(data, "nolock", 6) == 0)) {
1451 /* turn off mandatory locking in mode
1452 if remote locking is turned off since the
1453 local vfs will do advisory */
1454 if (vol->file_mode ==
1455 (S_IALLUGO & ~(S_ISUID | S_IXGRP)))
1456 vol->file_mode = S_IALLUGO;
1457 } else if (strnicmp(data, "forcemandatorylock", 9) == 0) {
1458 /* will take the shorter form "forcemand" as well */
1459 /* This mount option will force use of mandatory
1460 (DOS/Windows style) byte range locks, instead of
1461 using posix advisory byte range locks, even if the
1462 Unix extensions are available and posix locks would
1463 be supported otherwise. If Unix extensions are not
1464 negotiated this has no effect since mandatory locks
1465 would be used (mandatory locks is all that those
1466 those servers support) */
1468 } else if (strnicmp(data, "setuids", 7) == 0) {
1470 } else if (strnicmp(data, "nosetuids", 9) == 0) {
1472 } else if (strnicmp(data, "dynperm", 7) == 0) {
1473 vol->dynperm = true;
1474 } else if (strnicmp(data, "nodynperm", 9) == 0) {
1475 vol->dynperm = false;
1476 } else if (strnicmp(data, "nohard", 6) == 0) {
1478 } else if (strnicmp(data, "nosoft", 6) == 0) {
1480 } else if (strnicmp(data, "nointr", 6) == 0) {
1482 } else if (strnicmp(data, "intr", 4) == 0) {
1484 } else if (strnicmp(data, "nostrictsync", 12) == 0) {
1485 vol->nostrictsync = 1;
1486 } else if (strnicmp(data, "strictsync", 10) == 0) {
1487 vol->nostrictsync = 0;
1488 } else if (strnicmp(data, "serverino", 7) == 0) {
1489 vol->server_ino = 1;
1490 } else if (strnicmp(data, "noserverino", 9) == 0) {
1491 vol->server_ino = 0;
1492 } else if (strnicmp(data, "rwpidforward", 12) == 0) {
1493 vol->rwpidforward = 1;
1494 } else if (strnicmp(data, "cifsacl", 7) == 0) {
1496 } else if (strnicmp(data, "nocifsacl", 9) == 0) {
1498 } else if (strnicmp(data, "acl", 3) == 0) {
1499 vol->no_psx_acl = 0;
1500 } else if (strnicmp(data, "noacl", 5) == 0) {
1501 vol->no_psx_acl = 1;
1502 } else if (strnicmp(data, "locallease", 6) == 0) {
1503 vol->local_lease = 1;
1504 } else if (strnicmp(data, "sign", 4) == 0) {
1505 vol->secFlg |= CIFSSEC_MUST_SIGN;
1506 } else if (strnicmp(data, "seal", 4) == 0) {
1507 /* we do not do the following in secFlags because seal
1508 is a per tree connection (mount) not a per socket
1509 or per-smb connection option in the protocol */
1510 /* vol->secFlg |= CIFSSEC_MUST_SEAL; */
1512 } else if (strnicmp(data, "direct", 6) == 0) {
1514 } else if (strnicmp(data, "forcedirectio", 13) == 0) {
1516 } else if (strnicmp(data, "strictcache", 11) == 0) {
1518 } else if (strnicmp(data, "noac", 4) == 0) {
1519 printk(KERN_WARNING "CIFS: Mount option noac not "
1520 "supported. Instead set "
1521 "/proc/fs/cifs/LookupCacheEnabled to 0\n");
1522 } else if (strnicmp(data, "fsc", 3) == 0) {
1523 #ifndef CONFIG_CIFS_FSCACHE
1524 cERROR(1, "FS-Cache support needs CONFIG_CIFS_FSCACHE "
1525 "kernel config option set");
1526 goto cifs_parse_mount_err;
1529 } else if (strnicmp(data, "mfsymlinks", 10) == 0) {
1530 vol->mfsymlinks = true;
1531 } else if (strnicmp(data, "multiuser", 8) == 0) {
1532 vol->multiuser = true;
1533 } else if (!strnicmp(data, "backupuid", 9) && value && *value) {
1534 err = kstrtouint(value, 0, &vol->backupuid);
1536 cERROR(1, "%s: Invalid backupuid value",
1538 goto cifs_parse_mount_err;
1540 vol->backupuid_specified = true;
1541 } else if (!strnicmp(data, "backupgid", 9) && value && *value) {
1542 err = kstrtouint(value, 0, &vol->backupgid);
1544 cERROR(1, "%s: Invalid backupgid value",
1546 goto cifs_parse_mount_err;
1548 vol->backupgid_specified = true;
1550 printk(KERN_WARNING "CIFS: Unknown mount option %s\n",
1553 if (vol->UNC == NULL) {
1554 if (devname == NULL) {
1555 printk(KERN_WARNING "CIFS: Missing UNC name for mount "
1557 goto cifs_parse_mount_err;
1559 if ((temp_len = strnlen(devname, 300)) < 300) {
1560 vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
1561 if (vol->UNC == NULL)
1562 goto cifs_parse_mount_err;
1563 strcpy(vol->UNC, devname);
1564 if (strncmp(vol->UNC, "//", 2) == 0) {
1567 } else if (strncmp(vol->UNC, "\\\\", 2) != 0) {
1568 printk(KERN_WARNING "CIFS: UNC Path does not "
1569 "begin with // or \\\\ \n");
1570 goto cifs_parse_mount_err;
1572 value = strpbrk(vol->UNC+2, "/\\");
1576 printk(KERN_WARNING "CIFS: UNC name too long\n");
1577 goto cifs_parse_mount_err;
1581 if (vol->multiuser && !(vol->secFlg & CIFSSEC_MAY_KRB5)) {
1582 cERROR(1, "Multiuser mounts currently require krb5 "
1584 goto cifs_parse_mount_err;
1587 if (vol->UNCip == NULL)
1588 vol->UNCip = &vol->UNC[2];
1591 vol->override_uid = override_uid;
1592 else if (override_uid == 1)
1593 printk(KERN_NOTICE "CIFS: ignoring forceuid mount option "
1594 "specified with no uid= option.\n");
1597 vol->override_gid = override_gid;
1598 else if (override_gid == 1)
1599 printk(KERN_NOTICE "CIFS: ignoring forcegid mount option "
1600 "specified with no gid= option.\n");
1602 kfree(mountdata_copy);
1605 cifs_parse_mount_err:
1606 kfree(mountdata_copy);
1610 /** Returns true if srcaddr isn't specified and rhs isn't
1611 * specified, or if srcaddr is specified and
1612 * matches the IP address of the rhs argument.
1615 srcip_matches(struct sockaddr *srcaddr, struct sockaddr *rhs)
1617 switch (srcaddr->sa_family) {
1619 return (rhs->sa_family == AF_UNSPEC);
1621 struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr;
1622 struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs;
1623 return (saddr4->sin_addr.s_addr == vaddr4->sin_addr.s_addr);
1626 struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr;
1627 struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)&rhs;
1628 return ipv6_addr_equal(&saddr6->sin6_addr, &vaddr6->sin6_addr);
1632 return false; /* don't expect to be here */
1637 * If no port is specified in addr structure, we try to match with 445 port
1638 * and if it fails - with 139 ports. It should be called only if address
1639 * families of server and addr are equal.
1642 match_port(struct TCP_Server_Info *server, struct sockaddr *addr)
1644 __be16 port, *sport;
1646 switch (addr->sa_family) {
1648 sport = &((struct sockaddr_in *) &server->dstaddr)->sin_port;
1649 port = ((struct sockaddr_in *) addr)->sin_port;
1652 sport = &((struct sockaddr_in6 *) &server->dstaddr)->sin6_port;
1653 port = ((struct sockaddr_in6 *) addr)->sin6_port;
1661 port = htons(CIFS_PORT);
1665 port = htons(RFC1001_PORT);
1668 return port == *sport;
1672 match_address(struct TCP_Server_Info *server, struct sockaddr *addr,
1673 struct sockaddr *srcaddr)
1675 switch (addr->sa_family) {
1677 struct sockaddr_in *addr4 = (struct sockaddr_in *)addr;
1678 struct sockaddr_in *srv_addr4 =
1679 (struct sockaddr_in *)&server->dstaddr;
1681 if (addr4->sin_addr.s_addr != srv_addr4->sin_addr.s_addr)
1686 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
1687 struct sockaddr_in6 *srv_addr6 =
1688 (struct sockaddr_in6 *)&server->dstaddr;
1690 if (!ipv6_addr_equal(&addr6->sin6_addr,
1691 &srv_addr6->sin6_addr))
1693 if (addr6->sin6_scope_id != srv_addr6->sin6_scope_id)
1699 return false; /* don't expect to be here */
1702 if (!srcip_matches(srcaddr, (struct sockaddr *)&server->srcaddr))
1709 match_security(struct TCP_Server_Info *server, struct smb_vol *vol)
1711 unsigned int secFlags;
1713 if (vol->secFlg & (~(CIFSSEC_MUST_SIGN | CIFSSEC_MUST_SEAL)))
1714 secFlags = vol->secFlg;
1716 secFlags = global_secflags | vol->secFlg;
1718 switch (server->secType) {
1720 if (!(secFlags & (CIFSSEC_MAY_LANMAN|CIFSSEC_MAY_PLNTXT)))
1724 if (!(secFlags & CIFSSEC_MAY_NTLMV2))
1728 if (!(secFlags & CIFSSEC_MAY_NTLM))
1732 if (!(secFlags & CIFSSEC_MAY_KRB5))
1736 if (!(secFlags & CIFSSEC_MAY_NTLMSSP))
1740 /* shouldn't happen */
1744 /* now check if signing mode is acceptable */
1745 if ((secFlags & CIFSSEC_MAY_SIGN) == 0 &&
1746 (server->sec_mode & SECMODE_SIGN_REQUIRED))
1748 else if (((secFlags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN) &&
1750 (SECMODE_SIGN_ENABLED|SECMODE_SIGN_REQUIRED)) == 0)
1756 static int match_server(struct TCP_Server_Info *server, struct sockaddr *addr,
1757 struct smb_vol *vol)
1759 if (!net_eq(cifs_net_ns(server), current->nsproxy->net_ns))
1762 if (!match_address(server, addr,
1763 (struct sockaddr *)&vol->srcaddr))
1766 if (!match_port(server, addr))
1769 if (!match_security(server, vol))
1775 static struct TCP_Server_Info *
1776 cifs_find_tcp_session(struct sockaddr *addr, struct smb_vol *vol)
1778 struct TCP_Server_Info *server;
1780 spin_lock(&cifs_tcp_ses_lock);
1781 list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
1782 if (!match_server(server, addr, vol))
1785 ++server->srv_count;
1786 spin_unlock(&cifs_tcp_ses_lock);
1787 cFYI(1, "Existing tcp session with server found");
1790 spin_unlock(&cifs_tcp_ses_lock);
1795 cifs_put_tcp_session(struct TCP_Server_Info *server)
1797 struct task_struct *task;
1799 spin_lock(&cifs_tcp_ses_lock);
1800 if (--server->srv_count > 0) {
1801 spin_unlock(&cifs_tcp_ses_lock);
1805 put_net(cifs_net_ns(server));
1807 list_del_init(&server->tcp_ses_list);
1808 spin_unlock(&cifs_tcp_ses_lock);
1810 cancel_delayed_work_sync(&server->echo);
1812 spin_lock(&GlobalMid_Lock);
1813 server->tcpStatus = CifsExiting;
1814 spin_unlock(&GlobalMid_Lock);
1816 cifs_crypto_shash_release(server);
1817 cifs_fscache_release_client_cookie(server);
1819 kfree(server->session_key.response);
1820 server->session_key.response = NULL;
1821 server->session_key.len = 0;
1823 task = xchg(&server->tsk, NULL);
1825 force_sig(SIGKILL, task);
1828 static struct TCP_Server_Info *
1829 cifs_get_tcp_session(struct smb_vol *volume_info)
1831 struct TCP_Server_Info *tcp_ses = NULL;
1832 struct sockaddr_storage addr;
1833 struct sockaddr_in *sin_server = (struct sockaddr_in *) &addr;
1834 struct sockaddr_in6 *sin_server6 = (struct sockaddr_in6 *) &addr;
1837 memset(&addr, 0, sizeof(struct sockaddr_storage));
1839 cFYI(1, "UNC: %s ip: %s", volume_info->UNC, volume_info->UNCip);
1841 if (volume_info->UNCip && volume_info->UNC) {
1842 rc = cifs_fill_sockaddr((struct sockaddr *)&addr,
1844 strlen(volume_info->UNCip),
1847 /* we failed translating address */
1851 } else if (volume_info->UNCip) {
1852 /* BB using ip addr as tcp_ses name to connect to the
1854 cERROR(1, "Connecting to DFS root not implemented yet");
1857 } else /* which tcp_sess DFS root would we conect to */ {
1858 cERROR(1, "CIFS mount error: No UNC path (e.g. -o "
1859 "unc=//192.168.1.100/public) specified");
1864 /* see if we already have a matching tcp_ses */
1865 tcp_ses = cifs_find_tcp_session((struct sockaddr *)&addr, volume_info);
1869 tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
1875 rc = cifs_crypto_shash_allocate(tcp_ses);
1877 cERROR(1, "could not setup hash structures rc %d", rc);
1881 cifs_set_net_ns(tcp_ses, get_net(current->nsproxy->net_ns));
1882 tcp_ses->hostname = extract_hostname(volume_info->UNC);
1883 if (IS_ERR(tcp_ses->hostname)) {
1884 rc = PTR_ERR(tcp_ses->hostname);
1885 goto out_err_crypto_release;
1888 tcp_ses->noblocksnd = volume_info->noblocksnd;
1889 tcp_ses->noautotune = volume_info->noautotune;
1890 tcp_ses->tcp_nodelay = volume_info->sockopt_tcp_nodelay;
1891 atomic_set(&tcp_ses->inFlight, 0);
1892 init_waitqueue_head(&tcp_ses->response_q);
1893 init_waitqueue_head(&tcp_ses->request_q);
1894 INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
1895 mutex_init(&tcp_ses->srv_mutex);
1896 memcpy(tcp_ses->workstation_RFC1001_name,
1897 volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1898 memcpy(tcp_ses->server_RFC1001_name,
1899 volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1900 tcp_ses->session_estab = false;
1901 tcp_ses->sequence_number = 0;
1902 tcp_ses->lstrp = jiffies;
1903 INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
1904 INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
1905 INIT_DELAYED_WORK(&tcp_ses->echo, cifs_echo_request);
1908 * at this point we are the only ones with the pointer
1909 * to the struct since the kernel thread not created yet
1910 * no need to spinlock this init of tcpStatus or srv_count
1912 tcp_ses->tcpStatus = CifsNew;
1913 memcpy(&tcp_ses->srcaddr, &volume_info->srcaddr,
1914 sizeof(tcp_ses->srcaddr));
1915 ++tcp_ses->srv_count;
1917 if (addr.ss_family == AF_INET6) {
1918 cFYI(1, "attempting ipv6 connect");
1919 /* BB should we allow ipv6 on port 139? */
1920 /* other OS never observed in Wild doing 139 with v6 */
1921 memcpy(&tcp_ses->dstaddr, sin_server6,
1922 sizeof(struct sockaddr_in6));
1924 memcpy(&tcp_ses->dstaddr, sin_server,
1925 sizeof(struct sockaddr_in));
1927 rc = ip_connect(tcp_ses);
1929 cERROR(1, "Error connecting to socket. Aborting operation");
1930 goto out_err_crypto_release;
1934 * since we're in a cifs function already, we know that
1935 * this will succeed. No need for try_module_get().
1937 __module_get(THIS_MODULE);
1938 tcp_ses->tsk = kthread_run(cifs_demultiplex_thread,
1940 if (IS_ERR(tcp_ses->tsk)) {
1941 rc = PTR_ERR(tcp_ses->tsk);
1942 cERROR(1, "error %d create cifsd thread", rc);
1943 module_put(THIS_MODULE);
1944 goto out_err_crypto_release;
1946 tcp_ses->tcpStatus = CifsNeedNegotiate;
1948 /* thread spawned, put it on the list */
1949 spin_lock(&cifs_tcp_ses_lock);
1950 list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
1951 spin_unlock(&cifs_tcp_ses_lock);
1953 cifs_fscache_get_client_cookie(tcp_ses);
1955 /* queue echo request delayed work */
1956 queue_delayed_work(system_nrt_wq, &tcp_ses->echo, SMB_ECHO_INTERVAL);
1960 out_err_crypto_release:
1961 cifs_crypto_shash_release(tcp_ses);
1963 put_net(cifs_net_ns(tcp_ses));
1967 if (!IS_ERR(tcp_ses->hostname))
1968 kfree(tcp_ses->hostname);
1969 if (tcp_ses->ssocket)
1970 sock_release(tcp_ses->ssocket);
1976 static int match_session(struct cifs_ses *ses, struct smb_vol *vol)
1978 switch (ses->server->secType) {
1980 if (vol->cred_uid != ses->cred_uid)
1984 /* anything else takes username/password */
1985 if (ses->user_name == NULL)
1987 if (strncmp(ses->user_name, vol->username,
1990 if (strlen(vol->username) != 0 &&
1991 ses->password != NULL &&
1992 strncmp(ses->password,
1993 vol->password ? vol->password : "",
2000 static struct cifs_ses *
2001 cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol)
2003 struct cifs_ses *ses;
2005 spin_lock(&cifs_tcp_ses_lock);
2006 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
2007 if (!match_session(ses, vol))
2010 spin_unlock(&cifs_tcp_ses_lock);
2013 spin_unlock(&cifs_tcp_ses_lock);
2018 cifs_put_smb_ses(struct cifs_ses *ses)
2021 struct TCP_Server_Info *server = ses->server;
2023 cFYI(1, "%s: ses_count=%d\n", __func__, ses->ses_count);
2024 spin_lock(&cifs_tcp_ses_lock);
2025 if (--ses->ses_count > 0) {
2026 spin_unlock(&cifs_tcp_ses_lock);
2030 list_del_init(&ses->smb_ses_list);
2031 spin_unlock(&cifs_tcp_ses_lock);
2033 if (ses->status == CifsGood) {
2035 CIFSSMBLogoff(xid, ses);
2039 cifs_put_tcp_session(server);
2042 static bool warned_on_ntlm; /* globals init to false automatically */
2044 static struct cifs_ses *
2045 cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
2047 int rc = -ENOMEM, xid;
2048 struct cifs_ses *ses;
2049 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
2050 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
2054 ses = cifs_find_smb_ses(server, volume_info);
2056 cFYI(1, "Existing smb sess found (status=%d)", ses->status);
2058 mutex_lock(&ses->session_mutex);
2059 rc = cifs_negotiate_protocol(xid, ses);
2061 mutex_unlock(&ses->session_mutex);
2062 /* problem -- put our ses reference */
2063 cifs_put_smb_ses(ses);
2067 if (ses->need_reconnect) {
2068 cFYI(1, "Session needs reconnect");
2069 rc = cifs_setup_session(xid, ses,
2070 volume_info->local_nls);
2072 mutex_unlock(&ses->session_mutex);
2073 /* problem -- put our reference */
2074 cifs_put_smb_ses(ses);
2079 mutex_unlock(&ses->session_mutex);
2081 /* existing SMB ses has a server reference already */
2082 cifs_put_tcp_session(server);
2087 cFYI(1, "Existing smb sess not found");
2088 ses = sesInfoAlloc();
2092 /* new SMB session uses our server ref */
2093 ses->server = server;
2094 if (server->dstaddr.ss_family == AF_INET6)
2095 sprintf(ses->serverName, "%pI6", &addr6->sin6_addr);
2097 sprintf(ses->serverName, "%pI4", &addr->sin_addr);
2099 if (volume_info->username) {
2100 ses->user_name = kstrdup(volume_info->username, GFP_KERNEL);
2101 if (!ses->user_name)
2105 /* volume_info->password freed at unmount */
2106 if (volume_info->password) {
2107 ses->password = kstrdup(volume_info->password, GFP_KERNEL);
2111 if (volume_info->domainname) {
2112 ses->domainName = kstrdup(volume_info->domainname, GFP_KERNEL);
2113 if (!ses->domainName)
2116 ses->cred_uid = volume_info->cred_uid;
2117 ses->linux_uid = volume_info->linux_uid;
2119 /* ntlmv2 is much stronger than ntlm security, and has been broadly
2120 supported for many years, time to update default security mechanism */
2121 if ((volume_info->secFlg == 0) && warned_on_ntlm == false) {
2122 warned_on_ntlm = true;
2123 cERROR(1, "default security mechanism requested. The default "
2124 "security mechanism will be upgraded from ntlm to "
2125 "ntlmv2 in kernel release 3.3");
2127 ses->overrideSecFlg = volume_info->secFlg;
2129 mutex_lock(&ses->session_mutex);
2130 rc = cifs_negotiate_protocol(xid, ses);
2132 rc = cifs_setup_session(xid, ses, volume_info->local_nls);
2133 mutex_unlock(&ses->session_mutex);
2137 /* success, put it on the list */
2138 spin_lock(&cifs_tcp_ses_lock);
2139 list_add(&ses->smb_ses_list, &server->smb_ses_list);
2140 spin_unlock(&cifs_tcp_ses_lock);
2151 static int match_tcon(struct cifs_tcon *tcon, const char *unc)
2153 if (tcon->tidStatus == CifsExiting)
2155 if (strncmp(tcon->treeName, unc, MAX_TREE_SIZE))
2160 static struct cifs_tcon *
2161 cifs_find_tcon(struct cifs_ses *ses, const char *unc)
2163 struct list_head *tmp;
2164 struct cifs_tcon *tcon;
2166 spin_lock(&cifs_tcp_ses_lock);
2167 list_for_each(tmp, &ses->tcon_list) {
2168 tcon = list_entry(tmp, struct cifs_tcon, tcon_list);
2169 if (!match_tcon(tcon, unc))
2172 spin_unlock(&cifs_tcp_ses_lock);
2175 spin_unlock(&cifs_tcp_ses_lock);
2180 cifs_put_tcon(struct cifs_tcon *tcon)
2183 struct cifs_ses *ses = tcon->ses;
2185 cFYI(1, "%s: tc_count=%d\n", __func__, tcon->tc_count);
2186 spin_lock(&cifs_tcp_ses_lock);
2187 if (--tcon->tc_count > 0) {
2188 spin_unlock(&cifs_tcp_ses_lock);
2192 list_del_init(&tcon->tcon_list);
2193 spin_unlock(&cifs_tcp_ses_lock);
2196 CIFSSMBTDis(xid, tcon);
2199 cifs_fscache_release_super_cookie(tcon);
2201 cifs_put_smb_ses(ses);
2204 static struct cifs_tcon *
2205 cifs_get_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
2208 struct cifs_tcon *tcon;
2210 tcon = cifs_find_tcon(ses, volume_info->UNC);
2212 cFYI(1, "Found match on UNC path");
2213 /* existing tcon already has a reference */
2214 cifs_put_smb_ses(ses);
2215 if (tcon->seal != volume_info->seal)
2216 cERROR(1, "transport encryption setting "
2217 "conflicts with existing tid");
2221 tcon = tconInfoAlloc();
2228 if (volume_info->password) {
2229 tcon->password = kstrdup(volume_info->password, GFP_KERNEL);
2230 if (!tcon->password) {
2236 if (strchr(volume_info->UNC + 3, '\\') == NULL
2237 && strchr(volume_info->UNC + 3, '/') == NULL) {
2238 cERROR(1, "Missing share name");
2243 /* BB Do we need to wrap session_mutex around
2244 * this TCon call and Unix SetFS as
2245 * we do on SessSetup and reconnect? */
2247 rc = CIFSTCon(xid, ses, volume_info->UNC, tcon, volume_info->local_nls);
2249 cFYI(1, "CIFS Tcon rc = %d", rc);
2253 if (volume_info->nodfs) {
2254 tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
2255 cFYI(1, "DFS disabled (%d)", tcon->Flags);
2257 tcon->seal = volume_info->seal;
2258 /* we can have only one retry value for a connection
2259 to a share so for resources mounted more than once
2260 to the same server share the last value passed in
2261 for the retry flag is used */
2262 tcon->retry = volume_info->retry;
2263 tcon->nocase = volume_info->nocase;
2264 tcon->local_lease = volume_info->local_lease;
2266 spin_lock(&cifs_tcp_ses_lock);
2267 list_add(&tcon->tcon_list, &ses->tcon_list);
2268 spin_unlock(&cifs_tcp_ses_lock);
2270 cifs_fscache_get_super_cookie(tcon);
2280 cifs_put_tlink(struct tcon_link *tlink)
2282 if (!tlink || IS_ERR(tlink))
2285 if (!atomic_dec_and_test(&tlink->tl_count) ||
2286 test_bit(TCON_LINK_IN_TREE, &tlink->tl_flags)) {
2287 tlink->tl_time = jiffies;
2291 if (!IS_ERR(tlink_tcon(tlink)))
2292 cifs_put_tcon(tlink_tcon(tlink));
2297 static inline struct tcon_link *
2298 cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb)
2300 return cifs_sb->master_tlink;
2304 compare_mount_options(struct super_block *sb, struct cifs_mnt_data *mnt_data)
2306 struct cifs_sb_info *old = CIFS_SB(sb);
2307 struct cifs_sb_info *new = mnt_data->cifs_sb;
2309 if ((sb->s_flags & CIFS_MS_MASK) != (mnt_data->flags & CIFS_MS_MASK))
2312 if ((old->mnt_cifs_flags & CIFS_MOUNT_MASK) !=
2313 (new->mnt_cifs_flags & CIFS_MOUNT_MASK))
2317 * We want to share sb only if we don't specify an r/wsize or
2318 * specified r/wsize is greater than or equal to existing one.
2320 if (new->wsize && new->wsize < old->wsize)
2323 if (new->rsize && new->rsize < old->rsize)
2326 if (old->mnt_uid != new->mnt_uid || old->mnt_gid != new->mnt_gid)
2329 if (old->mnt_file_mode != new->mnt_file_mode ||
2330 old->mnt_dir_mode != new->mnt_dir_mode)
2333 if (strcmp(old->local_nls->charset, new->local_nls->charset))
2336 if (old->actimeo != new->actimeo)
2343 cifs_match_super(struct super_block *sb, void *data)
2345 struct cifs_mnt_data *mnt_data = (struct cifs_mnt_data *)data;
2346 struct smb_vol *volume_info;
2347 struct cifs_sb_info *cifs_sb;
2348 struct TCP_Server_Info *tcp_srv;
2349 struct cifs_ses *ses;
2350 struct cifs_tcon *tcon;
2351 struct tcon_link *tlink;
2352 struct sockaddr_storage addr;
2355 memset(&addr, 0, sizeof(struct sockaddr_storage));
2357 spin_lock(&cifs_tcp_ses_lock);
2358 cifs_sb = CIFS_SB(sb);
2359 tlink = cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
2360 if (IS_ERR(tlink)) {
2361 spin_unlock(&cifs_tcp_ses_lock);
2364 tcon = tlink_tcon(tlink);
2366 tcp_srv = ses->server;
2368 volume_info = mnt_data->vol;
2370 if (!volume_info->UNCip || !volume_info->UNC)
2373 rc = cifs_fill_sockaddr((struct sockaddr *)&addr,
2375 strlen(volume_info->UNCip),
2380 if (!match_server(tcp_srv, (struct sockaddr *)&addr, volume_info) ||
2381 !match_session(ses, volume_info) ||
2382 !match_tcon(tcon, volume_info->UNC)) {
2387 rc = compare_mount_options(sb, mnt_data);
2389 spin_unlock(&cifs_tcp_ses_lock);
2390 cifs_put_tlink(tlink);
2395 get_dfs_path(int xid, struct cifs_ses *pSesInfo, const char *old_path,
2396 const struct nls_table *nls_codepage, unsigned int *pnum_referrals,
2397 struct dfs_info3_param **preferrals, int remap)
2402 *pnum_referrals = 0;
2405 if (pSesInfo->ipc_tid == 0) {
2406 temp_unc = kmalloc(2 /* for slashes */ +
2407 strnlen(pSesInfo->serverName,
2408 SERVER_NAME_LEN_WITH_NULL * 2)
2409 + 1 + 4 /* slash IPC$ */ + 2,
2411 if (temp_unc == NULL)
2415 strcpy(temp_unc + 2, pSesInfo->serverName);
2416 strcpy(temp_unc + 2 + strlen(pSesInfo->serverName), "\\IPC$");
2417 rc = CIFSTCon(xid, pSesInfo, temp_unc, NULL, nls_codepage);
2418 cFYI(1, "CIFS Tcon rc = %d ipc_tid = %d", rc, pSesInfo->ipc_tid);
2422 rc = CIFSGetDFSRefer(xid, pSesInfo, old_path, preferrals,
2423 pnum_referrals, nls_codepage, remap);
2424 /* BB map targetUNCs to dfs_info3 structures, here or
2425 in CIFSGetDFSRefer BB */
2430 #ifdef CONFIG_DEBUG_LOCK_ALLOC
2431 static struct lock_class_key cifs_key[2];
2432 static struct lock_class_key cifs_slock_key[2];
2435 cifs_reclassify_socket4(struct socket *sock)
2437 struct sock *sk = sock->sk;
2438 BUG_ON(sock_owned_by_user(sk));
2439 sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
2440 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
2444 cifs_reclassify_socket6(struct socket *sock)
2446 struct sock *sk = sock->sk;
2447 BUG_ON(sock_owned_by_user(sk));
2448 sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
2449 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
2453 cifs_reclassify_socket4(struct socket *sock)
2458 cifs_reclassify_socket6(struct socket *sock)
2463 /* See RFC1001 section 14 on representation of Netbios names */
2464 static void rfc1002mangle(char *target, char *source, unsigned int length)
2468 for (i = 0, j = 0; i < (length); i++) {
2469 /* mask a nibble at a time and encode */
2470 target[j] = 'A' + (0x0F & (source[i] >> 4));
2471 target[j+1] = 'A' + (0x0F & source[i]);
2478 bind_socket(struct TCP_Server_Info *server)
2481 if (server->srcaddr.ss_family != AF_UNSPEC) {
2482 /* Bind to the specified local IP address */
2483 struct socket *socket = server->ssocket;
2484 rc = socket->ops->bind(socket,
2485 (struct sockaddr *) &server->srcaddr,
2486 sizeof(server->srcaddr));
2488 struct sockaddr_in *saddr4;
2489 struct sockaddr_in6 *saddr6;
2490 saddr4 = (struct sockaddr_in *)&server->srcaddr;
2491 saddr6 = (struct sockaddr_in6 *)&server->srcaddr;
2492 if (saddr6->sin6_family == AF_INET6)
2494 "Failed to bind to: %pI6c, error: %d\n",
2495 &saddr6->sin6_addr, rc);
2498 "Failed to bind to: %pI4, error: %d\n",
2499 &saddr4->sin_addr.s_addr, rc);
2506 ip_rfc1001_connect(struct TCP_Server_Info *server)
2510 * some servers require RFC1001 sessinit before sending
2511 * negprot - BB check reconnection in case where second
2512 * sessinit is sent but no second negprot
2514 struct rfc1002_session_packet *ses_init_buf;
2515 struct smb_hdr *smb_buf;
2516 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
2519 ses_init_buf->trailer.session_req.called_len = 32;
2521 if (server->server_RFC1001_name &&
2522 server->server_RFC1001_name[0] != 0)
2523 rfc1002mangle(ses_init_buf->trailer.
2524 session_req.called_name,
2525 server->server_RFC1001_name,
2526 RFC1001_NAME_LEN_WITH_NULL);
2528 rfc1002mangle(ses_init_buf->trailer.
2529 session_req.called_name,
2530 DEFAULT_CIFS_CALLED_NAME,
2531 RFC1001_NAME_LEN_WITH_NULL);
2533 ses_init_buf->trailer.session_req.calling_len = 32;
2536 * calling name ends in null (byte 16) from old smb
2539 if (server->workstation_RFC1001_name &&
2540 server->workstation_RFC1001_name[0] != 0)
2541 rfc1002mangle(ses_init_buf->trailer.
2542 session_req.calling_name,
2543 server->workstation_RFC1001_name,
2544 RFC1001_NAME_LEN_WITH_NULL);
2546 rfc1002mangle(ses_init_buf->trailer.
2547 session_req.calling_name,
2549 RFC1001_NAME_LEN_WITH_NULL);
2551 ses_init_buf->trailer.session_req.scope1 = 0;
2552 ses_init_buf->trailer.session_req.scope2 = 0;
2553 smb_buf = (struct smb_hdr *)ses_init_buf;
2555 /* sizeof RFC1002_SESSION_REQUEST with no scope */
2556 smb_buf->smb_buf_length = cpu_to_be32(0x81000044);
2557 rc = smb_send(server, smb_buf, 0x44);
2558 kfree(ses_init_buf);
2560 * RFC1001 layer in at least one server
2561 * requires very short break before negprot
2562 * presumably because not expecting negprot
2563 * to follow so fast. This is a simple
2564 * solution that works without
2565 * complicating the code and causes no
2566 * significant slowing down on mount
2569 usleep_range(1000, 2000);
2572 * else the negprot may still work without this
2573 * even though malloc failed
2580 generic_ip_connect(struct TCP_Server_Info *server)
2585 struct socket *socket = server->ssocket;
2586 struct sockaddr *saddr;
2588 saddr = (struct sockaddr *) &server->dstaddr;
2590 if (server->dstaddr.ss_family == AF_INET6) {
2591 sport = ((struct sockaddr_in6 *) saddr)->sin6_port;
2592 slen = sizeof(struct sockaddr_in6);
2595 sport = ((struct sockaddr_in *) saddr)->sin_port;
2596 slen = sizeof(struct sockaddr_in);
2600 if (socket == NULL) {
2601 rc = __sock_create(cifs_net_ns(server), sfamily, SOCK_STREAM,
2602 IPPROTO_TCP, &socket, 1);
2604 cERROR(1, "Error %d creating socket", rc);
2605 server->ssocket = NULL;
2609 /* BB other socket options to set KEEPALIVE, NODELAY? */
2610 cFYI(1, "Socket created");
2611 server->ssocket = socket;
2612 socket->sk->sk_allocation = GFP_NOFS;
2613 if (sfamily == AF_INET6)
2614 cifs_reclassify_socket6(socket);
2616 cifs_reclassify_socket4(socket);
2619 rc = bind_socket(server);
2624 * Eventually check for other socket options to change from
2625 * the default. sock_setsockopt not used because it expects
2628 socket->sk->sk_rcvtimeo = 7 * HZ;
2629 socket->sk->sk_sndtimeo = 5 * HZ;
2631 /* make the bufsizes depend on wsize/rsize and max requests */
2632 if (server->noautotune) {
2633 if (socket->sk->sk_sndbuf < (200 * 1024))
2634 socket->sk->sk_sndbuf = 200 * 1024;
2635 if (socket->sk->sk_rcvbuf < (140 * 1024))
2636 socket->sk->sk_rcvbuf = 140 * 1024;
2639 if (server->tcp_nodelay) {
2641 rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
2642 (char *)&val, sizeof(val));
2644 cFYI(1, "set TCP_NODELAY socket option error %d", rc);
2647 cFYI(1, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx",
2648 socket->sk->sk_sndbuf,
2649 socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
2651 rc = socket->ops->connect(socket, saddr, slen, 0);
2653 cFYI(1, "Error %d connecting to server", rc);
2654 sock_release(socket);
2655 server->ssocket = NULL;
2659 if (sport == htons(RFC1001_PORT))
2660 rc = ip_rfc1001_connect(server);
2666 ip_connect(struct TCP_Server_Info *server)
2669 struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
2670 struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
2672 if (server->dstaddr.ss_family == AF_INET6)
2673 sport = &addr6->sin6_port;
2675 sport = &addr->sin_port;
2680 /* try with 445 port at first */
2681 *sport = htons(CIFS_PORT);
2683 rc = generic_ip_connect(server);
2687 /* if it failed, try with 139 port */
2688 *sport = htons(RFC1001_PORT);
2691 return generic_ip_connect(server);
2694 void reset_cifs_unix_caps(int xid, struct cifs_tcon *tcon,
2695 struct cifs_sb_info *cifs_sb, struct smb_vol *vol_info)
2697 /* if we are reconnecting then should we check to see if
2698 * any requested capabilities changed locally e.g. via
2699 * remount but we can not do much about it here
2700 * if they have (even if we could detect it by the following)
2701 * Perhaps we could add a backpointer to array of sb from tcon
2702 * or if we change to make all sb to same share the same
2703 * sb as NFS - then we only have one backpointer to sb.
2704 * What if we wanted to mount the server share twice once with
2705 * and once without posixacls or posix paths? */
2706 __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
2708 if (vol_info && vol_info->no_linux_ext) {
2709 tcon->fsUnixInfo.Capability = 0;
2710 tcon->unix_ext = 0; /* Unix Extensions disabled */
2711 cFYI(1, "Linux protocol extensions disabled");
2713 } else if (vol_info)
2714 tcon->unix_ext = 1; /* Unix Extensions supported */
2716 if (tcon->unix_ext == 0) {
2717 cFYI(1, "Unix extensions disabled so not set on reconnect");
2721 if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
2722 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
2723 cFYI(1, "unix caps which server supports %lld", cap);
2724 /* check for reconnect case in which we do not
2725 want to change the mount behavior if we can avoid it */
2726 if (vol_info == NULL) {
2727 /* turn off POSIX ACL and PATHNAMES if not set
2728 originally at mount time */
2729 if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
2730 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
2731 if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
2732 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
2733 cERROR(1, "POSIXPATH support change");
2734 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
2735 } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
2736 cERROR(1, "possible reconnect error");
2737 cERROR(1, "server disabled POSIX path support");
2741 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
2742 cERROR(1, "per-share encryption not supported yet");
2744 cap &= CIFS_UNIX_CAP_MASK;
2745 if (vol_info && vol_info->no_psx_acl)
2746 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
2747 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
2748 cFYI(1, "negotiated posix acl support");
2750 cifs_sb->mnt_cifs_flags |=
2751 CIFS_MOUNT_POSIXACL;
2754 if (vol_info && vol_info->posix_paths == 0)
2755 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
2756 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
2757 cFYI(1, "negotiate posix pathnames");
2759 cifs_sb->mnt_cifs_flags |=
2760 CIFS_MOUNT_POSIX_PATHS;
2763 cFYI(1, "Negotiate caps 0x%x", (int)cap);
2764 #ifdef CONFIG_CIFS_DEBUG2
2765 if (cap & CIFS_UNIX_FCNTL_CAP)
2766 cFYI(1, "FCNTL cap");
2767 if (cap & CIFS_UNIX_EXTATTR_CAP)
2768 cFYI(1, "EXTATTR cap");
2769 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
2770 cFYI(1, "POSIX path cap");
2771 if (cap & CIFS_UNIX_XATTR_CAP)
2772 cFYI(1, "XATTR cap");
2773 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
2774 cFYI(1, "POSIX ACL cap");
2775 if (cap & CIFS_UNIX_LARGE_READ_CAP)
2776 cFYI(1, "very large read cap");
2777 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
2778 cFYI(1, "very large write cap");
2779 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_CAP)
2780 cFYI(1, "transport encryption cap");
2781 if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
2782 cFYI(1, "mandatory transport encryption cap");
2783 #endif /* CIFS_DEBUG2 */
2784 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
2785 if (vol_info == NULL) {
2786 cFYI(1, "resetting capabilities failed");
2788 cERROR(1, "Negotiating Unix capabilities "
2789 "with the server failed. Consider "
2790 "mounting with the Unix Extensions\n"
2791 "disabled, if problems are found, "
2792 "by specifying the nounix mount "
2799 void cifs_setup_cifs_sb(struct smb_vol *pvolume_info,
2800 struct cifs_sb_info *cifs_sb)
2802 INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks);
2804 spin_lock_init(&cifs_sb->tlink_tree_lock);
2805 cifs_sb->tlink_tree = RB_ROOT;
2808 * Temporarily set r/wsize for matching superblock. If we end up using
2809 * new sb then client will later negotiate it downward if needed.
2811 cifs_sb->rsize = pvolume_info->rsize;
2812 cifs_sb->wsize = pvolume_info->wsize;
2814 cifs_sb->mnt_uid = pvolume_info->linux_uid;
2815 cifs_sb->mnt_gid = pvolume_info->linux_gid;
2816 if (pvolume_info->backupuid_specified)
2817 cifs_sb->mnt_backupuid = pvolume_info->backupuid;
2818 if (pvolume_info->backupgid_specified)
2819 cifs_sb->mnt_backupgid = pvolume_info->backupgid;
2820 cifs_sb->mnt_file_mode = pvolume_info->file_mode;
2821 cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
2822 cFYI(1, "file mode: 0x%x dir mode: 0x%x",
2823 cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode);
2825 cifs_sb->actimeo = pvolume_info->actimeo;
2826 cifs_sb->local_nls = pvolume_info->local_nls;
2828 if (pvolume_info->noperm)
2829 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
2830 if (pvolume_info->setuids)
2831 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
2832 if (pvolume_info->server_ino)
2833 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
2834 if (pvolume_info->remap)
2835 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
2836 if (pvolume_info->no_xattr)
2837 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
2838 if (pvolume_info->sfu_emul)
2839 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
2840 if (pvolume_info->nobrl)
2841 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
2842 if (pvolume_info->nostrictsync)
2843 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
2844 if (pvolume_info->mand_lock)
2845 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
2846 if (pvolume_info->rwpidforward)
2847 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RWPIDFORWARD;
2848 if (pvolume_info->cifs_acl)
2849 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
2850 if (pvolume_info->backupuid_specified)
2851 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPUID;
2852 if (pvolume_info->backupgid_specified)
2853 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPGID;
2854 if (pvolume_info->override_uid)
2855 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
2856 if (pvolume_info->override_gid)
2857 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
2858 if (pvolume_info->dynperm)
2859 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
2860 if (pvolume_info->fsc)
2861 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_FSCACHE;
2862 if (pvolume_info->multiuser)
2863 cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_MULTIUSER |
2864 CIFS_MOUNT_NO_PERM);
2865 if (pvolume_info->strict_io)
2866 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_STRICT_IO;
2867 if (pvolume_info->direct_io) {
2868 cFYI(1, "mounting share using direct i/o");
2869 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
2871 if (pvolume_info->mfsymlinks) {
2872 if (pvolume_info->sfu_emul) {
2873 cERROR(1, "mount option mfsymlinks ignored if sfu "
2874 "mount option is used");
2876 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MF_SYMLINKS;
2880 if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
2881 cERROR(1, "mount option dynperm ignored if cifsacl "
2882 "mount option supported");
2886 * When the server supports very large reads and writes via POSIX extensions,
2887 * we can allow up to 2^24-1, minus the size of a READ/WRITE_AND_X header, not
2888 * including the RFC1001 length.
2890 * Note that this might make for "interesting" allocation problems during
2891 * writeback however as we have to allocate an array of pointers for the
2892 * pages. A 16M write means ~32kb page array with PAGE_CACHE_SIZE == 4096.
2894 * For reads, there is a similar problem as we need to allocate an array
2895 * of kvecs to handle the receive, though that should only need to be done
2898 #define CIFS_MAX_WSIZE ((1<<24) - 1 - sizeof(WRITE_REQ) + 4)
2899 #define CIFS_MAX_RSIZE ((1<<24) - sizeof(READ_RSP) + 4)
2902 * When the server doesn't allow large posix writes, only allow a rsize/wsize
2903 * of 2^17-1 minus the size of the call header. That allows for a read or
2904 * write up to the maximum size described by RFC1002.
2906 #define CIFS_MAX_RFC1002_WSIZE ((1<<17) - 1 - sizeof(WRITE_REQ) + 4)
2907 #define CIFS_MAX_RFC1002_RSIZE ((1<<17) - 1 - sizeof(READ_RSP) + 4)
2910 * The default wsize is 1M. find_get_pages seems to return a maximum of 256
2911 * pages in a single call. With PAGE_CACHE_SIZE == 4k, this means we can fill
2912 * a single wsize request with a single call.
2914 #define CIFS_DEFAULT_IOSIZE (1024 * 1024)
2917 * Windows only supports a max of 60kb reads and 65535 byte writes. Default to
2918 * those values when posix extensions aren't in force. In actuality here, we
2919 * use 65536 to allow for a write that is a multiple of 4k. Most servers seem
2920 * to be ok with the extra byte even though Windows doesn't send writes that
2925 * http://blogs.msdn.com/b/openspecification/archive/2009/04/10/smb-maximum-transmit-buffer-size-and-performance-tuning.aspx
2927 #define CIFS_DEFAULT_NON_POSIX_RSIZE (60 * 1024)
2928 #define CIFS_DEFAULT_NON_POSIX_WSIZE (65536)
2931 cifs_negotiate_wsize(struct cifs_tcon *tcon, struct smb_vol *pvolume_info)
2933 __u64 unix_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
2934 struct TCP_Server_Info *server = tcon->ses->server;
2937 /* start with specified wsize, or default */
2938 if (pvolume_info->wsize)
2939 wsize = pvolume_info->wsize;
2940 else if (tcon->unix_ext && (unix_cap & CIFS_UNIX_LARGE_WRITE_CAP))
2941 wsize = CIFS_DEFAULT_IOSIZE;
2943 wsize = CIFS_DEFAULT_NON_POSIX_WSIZE;
2945 /* can server support 24-bit write sizes? (via UNIX extensions) */
2946 if (!tcon->unix_ext || !(unix_cap & CIFS_UNIX_LARGE_WRITE_CAP))
2947 wsize = min_t(unsigned int, wsize, CIFS_MAX_RFC1002_WSIZE);
2950 * no CAP_LARGE_WRITE_X or is signing enabled without CAP_UNIX set?
2951 * Limit it to max buffer offered by the server, minus the size of the
2952 * WRITEX header, not including the 4 byte RFC1001 length.
2954 if (!(server->capabilities & CAP_LARGE_WRITE_X) ||
2955 (!(server->capabilities & CAP_UNIX) &&
2956 (server->sec_mode & (SECMODE_SIGN_ENABLED|SECMODE_SIGN_REQUIRED))))
2957 wsize = min_t(unsigned int, wsize,
2958 server->maxBuf - sizeof(WRITE_REQ) + 4);
2960 /* hard limit of CIFS_MAX_WSIZE */
2961 wsize = min_t(unsigned int, wsize, CIFS_MAX_WSIZE);
2967 cifs_negotiate_rsize(struct cifs_tcon *tcon, struct smb_vol *pvolume_info)
2969 __u64 unix_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
2970 struct TCP_Server_Info *server = tcon->ses->server;
2971 unsigned int rsize, defsize;
2974 * Set default value...
2976 * HACK alert! Ancient servers have very small buffers. Even though
2977 * MS-CIFS indicates that servers are only limited by the client's
2978 * bufsize for reads, testing against win98se shows that it throws
2979 * INVALID_PARAMETER errors if you try to request too large a read.
2981 * If the server advertises a MaxBufferSize of less than one page,
2982 * assume that it also can't satisfy reads larger than that either.
2984 * FIXME: Is there a better heuristic for this?
2986 if (tcon->unix_ext && (unix_cap & CIFS_UNIX_LARGE_READ_CAP))
2987 defsize = CIFS_DEFAULT_IOSIZE;
2988 else if (server->capabilities & CAP_LARGE_READ_X)
2989 defsize = CIFS_DEFAULT_NON_POSIX_RSIZE;
2990 else if (server->maxBuf >= PAGE_CACHE_SIZE)
2991 defsize = CIFSMaxBufSize;
2993 defsize = server->maxBuf - sizeof(READ_RSP);
2995 rsize = pvolume_info->rsize ? pvolume_info->rsize : defsize;
2998 * no CAP_LARGE_READ_X? Then MS-CIFS states that we must limit this to
2999 * the client's MaxBufferSize.
3001 if (!(server->capabilities & CAP_LARGE_READ_X))
3002 rsize = min_t(unsigned int, CIFSMaxBufSize, rsize);
3004 /* hard limit of CIFS_MAX_RSIZE */
3005 rsize = min_t(unsigned int, rsize, CIFS_MAX_RSIZE);
3011 is_path_accessible(int xid, struct cifs_tcon *tcon,
3012 struct cifs_sb_info *cifs_sb, const char *full_path)
3015 FILE_ALL_INFO *pfile_info;
3017 pfile_info = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
3018 if (pfile_info == NULL)
3021 rc = CIFSSMBQPathInfo(xid, tcon, full_path, pfile_info,
3022 0 /* not legacy */, cifs_sb->local_nls,
3023 cifs_sb->mnt_cifs_flags &
3024 CIFS_MOUNT_MAP_SPECIAL_CHR);
3026 if (rc == -EOPNOTSUPP || rc == -EINVAL)
3027 rc = SMBQueryInformation(xid, tcon, full_path, pfile_info,
3028 cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
3029 CIFS_MOUNT_MAP_SPECIAL_CHR);
3035 cleanup_volume_info_contents(struct smb_vol *volume_info)
3037 kfree(volume_info->username);
3038 kzfree(volume_info->password);
3039 if (volume_info->UNCip != volume_info->UNC + 2)
3040 kfree(volume_info->UNCip);
3041 kfree(volume_info->UNC);
3042 kfree(volume_info->domainname);
3043 kfree(volume_info->iocharset);
3044 kfree(volume_info->prepath);
3048 cifs_cleanup_volume_info(struct smb_vol *volume_info)
3052 cleanup_volume_info_contents(volume_info);
3057 #ifdef CONFIG_CIFS_DFS_UPCALL
3058 /* build_path_to_root returns full path to root when
3059 * we do not have an exiting connection (tcon) */
3061 build_unc_path_to_root(const struct smb_vol *vol,
3062 const struct cifs_sb_info *cifs_sb)
3064 char *full_path, *pos;
3065 unsigned int pplen = vol->prepath ? strlen(vol->prepath) : 0;
3066 unsigned int unc_len = strnlen(vol->UNC, MAX_TREE_SIZE + 1);
3068 full_path = kmalloc(unc_len + pplen + 1, GFP_KERNEL);
3069 if (full_path == NULL)
3070 return ERR_PTR(-ENOMEM);
3072 strncpy(full_path, vol->UNC, unc_len);
3073 pos = full_path + unc_len;
3076 strncpy(pos, vol->prepath, pplen);
3080 *pos = '\0'; /* add trailing null */
3081 convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
3082 cFYI(1, "%s: full_path=%s", __func__, full_path);
3087 * Perform a dfs referral query for a share and (optionally) prefix
3089 * If a referral is found, cifs_sb->mountdata will be (re-)allocated
3090 * to a string containing updated options for the submount. Otherwise it
3091 * will be left untouched.
3093 * Returns the rc from get_dfs_path to the caller, which can be used to
3094 * determine whether there were referrals.
3097 expand_dfs_referral(int xid, struct cifs_ses *pSesInfo,
3098 struct smb_vol *volume_info, struct cifs_sb_info *cifs_sb,
3102 unsigned int num_referrals = 0;
3103 struct dfs_info3_param *referrals = NULL;
3104 char *full_path = NULL, *ref_path = NULL, *mdata = NULL;
3106 full_path = build_unc_path_to_root(volume_info, cifs_sb);
3107 if (IS_ERR(full_path))
3108 return PTR_ERR(full_path);
3110 /* For DFS paths, skip the first '\' of the UNC */
3111 ref_path = check_prefix ? full_path + 1 : volume_info->UNC + 1;
3113 rc = get_dfs_path(xid, pSesInfo , ref_path, cifs_sb->local_nls,
3114 &num_referrals, &referrals,
3115 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
3117 if (!rc && num_referrals > 0) {
3118 char *fake_devname = NULL;
3120 mdata = cifs_compose_mount_options(cifs_sb->mountdata,
3121 full_path + 1, referrals,
3124 free_dfs_info_array(referrals, num_referrals);
3126 if (IS_ERR(mdata)) {
3127 rc = PTR_ERR(mdata);
3130 cleanup_volume_info_contents(volume_info);
3131 memset(volume_info, '\0', sizeof(*volume_info));
3132 rc = cifs_setup_volume_info(volume_info, mdata,
3135 kfree(fake_devname);
3136 kfree(cifs_sb->mountdata);
3137 cifs_sb->mountdata = mdata;
3145 cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
3146 const char *devname)
3150 if (cifs_parse_mount_options(mount_data, devname, volume_info))
3153 if (volume_info->nullauth) {
3154 cFYI(1, "null user");
3155 volume_info->username = kzalloc(1, GFP_KERNEL);
3156 if (volume_info->username == NULL)
3158 } else if (volume_info->username) {
3159 /* BB fixme parse for domain name here */
3160 cFYI(1, "Username: %s", volume_info->username);
3162 cifserror("No username specified");
3163 /* In userspace mount helper we can get user name from alternate
3164 locations such as env variables and files on disk */
3168 /* this is needed for ASCII cp to Unicode converts */
3169 if (volume_info->iocharset == NULL) {
3170 /* load_nls_default cannot return null */
3171 volume_info->local_nls = load_nls_default();
3173 volume_info->local_nls = load_nls(volume_info->iocharset);
3174 if (volume_info->local_nls == NULL) {
3175 cERROR(1, "CIFS mount error: iocharset %s not found",
3176 volume_info->iocharset);
3185 cifs_get_volume_info(char *mount_data, const char *devname)
3188 struct smb_vol *volume_info;
3190 volume_info = kzalloc(sizeof(struct smb_vol), GFP_KERNEL);
3192 return ERR_PTR(-ENOMEM);
3194 rc = cifs_setup_volume_info(volume_info, mount_data, devname);
3196 cifs_cleanup_volume_info(volume_info);
3197 volume_info = ERR_PTR(rc);
3203 /* make sure ra_pages is a multiple of rsize */
3204 static inline unsigned int
3205 cifs_ra_pages(struct cifs_sb_info *cifs_sb)
3208 unsigned int rsize_pages = cifs_sb->rsize / PAGE_CACHE_SIZE;
3210 if (rsize_pages >= default_backing_dev_info.ra_pages)
3211 return default_backing_dev_info.ra_pages;
3212 else if (rsize_pages == 0)
3215 reads = default_backing_dev_info.ra_pages / rsize_pages;
3216 return reads * rsize_pages;
3220 cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *volume_info)
3224 struct cifs_ses *pSesInfo;
3225 struct cifs_tcon *tcon;
3226 struct TCP_Server_Info *srvTcp;
3228 struct tcon_link *tlink;
3229 #ifdef CONFIG_CIFS_DFS_UPCALL
3230 int referral_walks_count = 0;
3233 rc = bdi_setup_and_register(&cifs_sb->bdi, "cifs", BDI_CAP_MAP_COPY);
3237 #ifdef CONFIG_CIFS_DFS_UPCALL
3239 /* cleanup activities if we're chasing a referral */
3240 if (referral_walks_count) {
3242 cifs_put_tcon(tcon);
3244 cifs_put_smb_ses(pSesInfo);
3257 /* get a reference to a tcp session */
3258 srvTcp = cifs_get_tcp_session(volume_info);
3259 if (IS_ERR(srvTcp)) {
3260 rc = PTR_ERR(srvTcp);
3261 bdi_destroy(&cifs_sb->bdi);
3265 /* get a reference to a SMB session */
3266 pSesInfo = cifs_get_smb_ses(srvTcp, volume_info);
3267 if (IS_ERR(pSesInfo)) {
3268 rc = PTR_ERR(pSesInfo);
3270 goto mount_fail_check;
3273 /* search for existing tcon to this server share */
3274 tcon = cifs_get_tcon(pSesInfo, volume_info);
3278 goto remote_path_check;
3281 /* tell server which Unix caps we support */
3282 if (tcon->ses->capabilities & CAP_UNIX) {
3283 /* reset of caps checks mount to see if unix extensions
3284 disabled for just this mount */
3285 reset_cifs_unix_caps(xid, tcon, cifs_sb, volume_info);
3286 if ((tcon->ses->server->tcpStatus == CifsNeedReconnect) &&
3287 (le64_to_cpu(tcon->fsUnixInfo.Capability) &
3288 CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)) {
3290 goto mount_fail_check;
3293 tcon->unix_ext = 0; /* server does not support them */
3295 /* do not care if following two calls succeed - informational */
3297 CIFSSMBQFSDeviceInfo(xid, tcon);
3298 CIFSSMBQFSAttributeInfo(xid, tcon);
3301 cifs_sb->wsize = cifs_negotiate_wsize(tcon, volume_info);
3302 cifs_sb->rsize = cifs_negotiate_rsize(tcon, volume_info);
3304 /* tune readahead according to rsize */
3305 cifs_sb->bdi.ra_pages = cifs_ra_pages(cifs_sb);
3308 #ifdef CONFIG_CIFS_DFS_UPCALL
3310 * Perform an unconditional check for whether there are DFS
3311 * referrals for this path without prefix, to provide support
3312 * for DFS referrals from w2k8 servers which don't seem to respond
3313 * with PATH_NOT_COVERED to requests that include the prefix.
3314 * Chase the referral if found, otherwise continue normally.
3316 if (referral_walks_count == 0) {
3317 int refrc = expand_dfs_referral(xid, pSesInfo, volume_info,
3320 referral_walks_count++;
3321 goto try_mount_again;
3326 /* check if a whole path is not remote */
3328 /* build_path_to_root works only when we have a valid tcon */
3329 full_path = cifs_build_path_to_root(volume_info, cifs_sb, tcon);
3330 if (full_path == NULL) {
3332 goto mount_fail_check;
3334 rc = is_path_accessible(xid, tcon, cifs_sb, full_path);
3335 if (rc != 0 && rc != -EREMOTE) {
3337 goto mount_fail_check;
3342 /* get referral if needed */
3343 if (rc == -EREMOTE) {
3344 #ifdef CONFIG_CIFS_DFS_UPCALL
3345 if (referral_walks_count > MAX_NESTED_LINKS) {
3347 * BB: when we implement proper loop detection,
3348 * we will remove this check. But now we need it
3349 * to prevent an indefinite loop if 'DFS tree' is
3350 * misconfigured (i.e. has loops).
3353 goto mount_fail_check;
3356 rc = expand_dfs_referral(xid, pSesInfo, volume_info, cifs_sb,
3360 referral_walks_count++;
3361 goto try_mount_again;
3363 goto mount_fail_check;
3364 #else /* No DFS support, return error on mount */
3370 goto mount_fail_check;
3372 /* now, hang the tcon off of the superblock */
3373 tlink = kzalloc(sizeof *tlink, GFP_KERNEL);
3374 if (tlink == NULL) {
3376 goto mount_fail_check;
3379 tlink->tl_uid = pSesInfo->linux_uid;
3380 tlink->tl_tcon = tcon;
3381 tlink->tl_time = jiffies;
3382 set_bit(TCON_LINK_MASTER, &tlink->tl_flags);
3383 set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3385 cifs_sb->master_tlink = tlink;
3386 spin_lock(&cifs_sb->tlink_tree_lock);
3387 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
3388 spin_unlock(&cifs_sb->tlink_tree_lock);
3390 queue_delayed_work(system_nrt_wq, &cifs_sb->prune_tlinks,
3394 /* on error free sesinfo and tcon struct if needed */
3396 /* If find_unc succeeded then rc == 0 so we can not end */
3397 /* up accidentally freeing someone elses tcon struct */
3399 cifs_put_tcon(tcon);
3401 cifs_put_smb_ses(pSesInfo);
3403 cifs_put_tcp_session(srvTcp);
3404 bdi_destroy(&cifs_sb->bdi);
3413 * Issue a TREE_CONNECT request. Note that for IPC$ shares, that the tcon
3414 * pointer may be NULL.
3417 CIFSTCon(unsigned int xid, struct cifs_ses *ses,
3418 const char *tree, struct cifs_tcon *tcon,
3419 const struct nls_table *nls_codepage)
3421 struct smb_hdr *smb_buffer;
3422 struct smb_hdr *smb_buffer_response;
3425 unsigned char *bcc_ptr;
3428 __u16 bytes_left, count;
3433 smb_buffer = cifs_buf_get();
3434 if (smb_buffer == NULL)
3437 smb_buffer_response = smb_buffer;
3439 header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
3440 NULL /*no tid */ , 4 /*wct */ );
3442 smb_buffer->Mid = GetNextMid(ses->server);
3443 smb_buffer->Uid = ses->Suid;
3444 pSMB = (TCONX_REQ *) smb_buffer;
3445 pSMBr = (TCONX_RSP *) smb_buffer_response;
3447 pSMB->AndXCommand = 0xFF;
3448 pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
3449 bcc_ptr = &pSMB->Password[0];
3450 if (!tcon || (ses->server->sec_mode & SECMODE_USER)) {
3451 pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
3452 *bcc_ptr = 0; /* password is null byte */
3453 bcc_ptr++; /* skip password */
3454 /* already aligned so no need to do it below */
3456 pSMB->PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
3457 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
3458 specified as required (when that support is added to
3459 the vfs in the future) as only NTLM or the much
3460 weaker LANMAN (which we do not send by default) is accepted
3461 by Samba (not sure whether other servers allow
3462 NTLMv2 password here) */
3463 #ifdef CONFIG_CIFS_WEAK_PW_HASH
3464 if ((global_secflags & CIFSSEC_MAY_LANMAN) &&
3465 (ses->server->secType == LANMAN))
3466 calc_lanman_hash(tcon->password, ses->server->cryptkey,
3467 ses->server->sec_mode &
3468 SECMODE_PW_ENCRYPT ? true : false,
3471 #endif /* CIFS_WEAK_PW_HASH */
3472 rc = SMBNTencrypt(tcon->password, ses->server->cryptkey,
3473 bcc_ptr, nls_codepage);
3475 bcc_ptr += CIFS_AUTH_RESP_SIZE;
3476 if (ses->capabilities & CAP_UNICODE) {
3477 /* must align unicode strings */
3478 *bcc_ptr = 0; /* null byte password */
3483 if (ses->server->sec_mode &
3484 (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
3485 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
3487 if (ses->capabilities & CAP_STATUS32) {
3488 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
3490 if (ses->capabilities & CAP_DFS) {
3491 smb_buffer->Flags2 |= SMBFLG2_DFS;
3493 if (ses->capabilities & CAP_UNICODE) {
3494 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
3496 cifs_strtoUCS((__le16 *) bcc_ptr, tree,
3497 6 /* max utf8 char length in bytes */ *
3498 (/* server len*/ + 256 /* share len */), nls_codepage);
3499 bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
3500 bcc_ptr += 2; /* skip trailing null */
3501 } else { /* ASCII */
3502 strcpy(bcc_ptr, tree);
3503 bcc_ptr += strlen(tree) + 1;
3505 strcpy(bcc_ptr, "?????");
3506 bcc_ptr += strlen("?????");
3508 count = bcc_ptr - &pSMB->Password[0];
3509 pSMB->hdr.smb_buf_length = cpu_to_be32(be32_to_cpu(
3510 pSMB->hdr.smb_buf_length) + count);
3511 pSMB->ByteCount = cpu_to_le16(count);
3513 rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
3516 /* above now done in SendReceive */
3517 if ((rc == 0) && (tcon != NULL)) {
3520 tcon->tidStatus = CifsGood;
3521 tcon->need_reconnect = false;
3522 tcon->tid = smb_buffer_response->Tid;
3523 bcc_ptr = pByteArea(smb_buffer_response);
3524 bytes_left = get_bcc(smb_buffer_response);
3525 length = strnlen(bcc_ptr, bytes_left - 2);
3526 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
3532 /* skip service field (NB: this field is always ASCII) */
3534 if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
3535 (bcc_ptr[2] == 'C')) {
3536 cFYI(1, "IPC connection");
3539 } else if (length == 2) {
3540 if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
3541 /* the most common case */
3542 cFYI(1, "disk share connection");
3545 bcc_ptr += length + 1;
3546 bytes_left -= (length + 1);
3547 strncpy(tcon->treeName, tree, MAX_TREE_SIZE);
3549 /* mostly informational -- no need to fail on error here */
3550 kfree(tcon->nativeFileSystem);
3551 tcon->nativeFileSystem = cifs_strndup_from_ucs(bcc_ptr,
3552 bytes_left, is_unicode,
3555 cFYI(1, "nativeFileSystem=%s", tcon->nativeFileSystem);
3557 if ((smb_buffer_response->WordCount == 3) ||
3558 (smb_buffer_response->WordCount == 7))
3559 /* field is in same location */
3560 tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
3563 cFYI(1, "Tcon flags: 0x%x ", tcon->Flags);
3564 } else if ((rc == 0) && tcon == NULL) {
3565 /* all we need to save for IPC$ connection */
3566 ses->ipc_tid = smb_buffer_response->Tid;
3569 cifs_buf_release(smb_buffer);
3574 cifs_umount(struct cifs_sb_info *cifs_sb)
3576 struct rb_root *root = &cifs_sb->tlink_tree;
3577 struct rb_node *node;
3578 struct tcon_link *tlink;
3580 cancel_delayed_work_sync(&cifs_sb->prune_tlinks);
3582 spin_lock(&cifs_sb->tlink_tree_lock);
3583 while ((node = rb_first(root))) {
3584 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
3585 cifs_get_tlink(tlink);
3586 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3587 rb_erase(node, root);
3589 spin_unlock(&cifs_sb->tlink_tree_lock);
3590 cifs_put_tlink(tlink);
3591 spin_lock(&cifs_sb->tlink_tree_lock);
3593 spin_unlock(&cifs_sb->tlink_tree_lock);
3595 bdi_destroy(&cifs_sb->bdi);
3596 kfree(cifs_sb->mountdata);
3597 unload_nls(cifs_sb->local_nls);
3601 int cifs_negotiate_protocol(unsigned int xid, struct cifs_ses *ses)
3604 struct TCP_Server_Info *server = ses->server;
3606 /* only send once per connect */
3607 if (server->maxBuf != 0)
3610 rc = CIFSSMBNegotiate(xid, ses);
3611 if (rc == -EAGAIN) {
3612 /* retry only once on 1st time connection */
3613 rc = CIFSSMBNegotiate(xid, ses);
3618 spin_lock(&GlobalMid_Lock);
3619 if (server->tcpStatus == CifsNeedNegotiate)
3620 server->tcpStatus = CifsGood;
3623 spin_unlock(&GlobalMid_Lock);
3631 int cifs_setup_session(unsigned int xid, struct cifs_ses *ses,
3632 struct nls_table *nls_info)
3635 struct TCP_Server_Info *server = ses->server;
3638 ses->capabilities = server->capabilities;
3639 if (linuxExtEnabled == 0)
3640 ses->capabilities &= (~CAP_UNIX);
3642 cFYI(1, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d",
3643 server->sec_mode, server->capabilities, server->timeAdj);
3645 rc = CIFS_SessSetup(xid, ses, nls_info);
3647 cERROR(1, "Send error in SessSetup = %d", rc);
3649 mutex_lock(&ses->server->srv_mutex);
3650 if (!server->session_estab) {
3651 server->session_key.response = ses->auth_key.response;
3652 server->session_key.len = ses->auth_key.len;
3653 server->sequence_number = 0x2;
3654 server->session_estab = true;
3655 ses->auth_key.response = NULL;
3657 mutex_unlock(&server->srv_mutex);
3659 cFYI(1, "CIFS Session Established successfully");
3660 spin_lock(&GlobalMid_Lock);
3661 ses->status = CifsGood;
3662 ses->need_reconnect = false;
3663 spin_unlock(&GlobalMid_Lock);
3666 kfree(ses->auth_key.response);
3667 ses->auth_key.response = NULL;
3668 ses->auth_key.len = 0;
3669 kfree(ses->ntlmssp);
3670 ses->ntlmssp = NULL;
3675 static struct cifs_tcon *
3676 cifs_construct_tcon(struct cifs_sb_info *cifs_sb, uid_t fsuid)
3678 struct cifs_tcon *master_tcon = cifs_sb_master_tcon(cifs_sb);
3679 struct cifs_ses *ses;
3680 struct cifs_tcon *tcon = NULL;
3681 struct smb_vol *vol_info;
3682 char username[28]; /* big enough for "krb50x" + hex of ULONG_MAX 6+16 */
3683 /* We used to have this as MAX_USERNAME which is */
3684 /* way too big now (256 instead of 32) */
3686 vol_info = kzalloc(sizeof(*vol_info), GFP_KERNEL);
3687 if (vol_info == NULL) {
3688 tcon = ERR_PTR(-ENOMEM);
3692 snprintf(username, sizeof(username), "krb50x%x", fsuid);
3693 vol_info->username = username;
3694 vol_info->local_nls = cifs_sb->local_nls;
3695 vol_info->linux_uid = fsuid;
3696 vol_info->cred_uid = fsuid;
3697 vol_info->UNC = master_tcon->treeName;
3698 vol_info->retry = master_tcon->retry;
3699 vol_info->nocase = master_tcon->nocase;
3700 vol_info->local_lease = master_tcon->local_lease;
3701 vol_info->no_linux_ext = !master_tcon->unix_ext;
3703 /* FIXME: allow for other secFlg settings */
3704 vol_info->secFlg = CIFSSEC_MUST_KRB5;
3706 /* get a reference for the same TCP session */
3707 spin_lock(&cifs_tcp_ses_lock);
3708 ++master_tcon->ses->server->srv_count;
3709 spin_unlock(&cifs_tcp_ses_lock);
3711 ses = cifs_get_smb_ses(master_tcon->ses->server, vol_info);
3713 tcon = (struct cifs_tcon *)ses;
3714 cifs_put_tcp_session(master_tcon->ses->server);
3718 tcon = cifs_get_tcon(ses, vol_info);
3720 cifs_put_smb_ses(ses);
3724 if (ses->capabilities & CAP_UNIX)
3725 reset_cifs_unix_caps(0, tcon, NULL, vol_info);
3733 cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
3735 return tlink_tcon(cifs_sb_master_tlink(cifs_sb));
3739 cifs_sb_tcon_pending_wait(void *unused)
3742 return signal_pending(current) ? -ERESTARTSYS : 0;
3745 /* find and return a tlink with given uid */
3746 static struct tcon_link *
3747 tlink_rb_search(struct rb_root *root, uid_t uid)
3749 struct rb_node *node = root->rb_node;
3750 struct tcon_link *tlink;
3753 tlink = rb_entry(node, struct tcon_link, tl_rbnode);
3755 if (tlink->tl_uid > uid)
3756 node = node->rb_left;
3757 else if (tlink->tl_uid < uid)
3758 node = node->rb_right;
3765 /* insert a tcon_link into the tree */
3767 tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink)
3769 struct rb_node **new = &(root->rb_node), *parent = NULL;
3770 struct tcon_link *tlink;
3773 tlink = rb_entry(*new, struct tcon_link, tl_rbnode);
3776 if (tlink->tl_uid > new_tlink->tl_uid)
3777 new = &((*new)->rb_left);
3779 new = &((*new)->rb_right);
3782 rb_link_node(&new_tlink->tl_rbnode, parent, new);
3783 rb_insert_color(&new_tlink->tl_rbnode, root);
3787 * Find or construct an appropriate tcon given a cifs_sb and the fsuid of the
3790 * If the superblock doesn't refer to a multiuser mount, then just return
3791 * the master tcon for the mount.
3793 * First, search the rbtree for an existing tcon for this fsuid. If one
3794 * exists, then check to see if it's pending construction. If it is then wait
3795 * for construction to complete. Once it's no longer pending, check to see if
3796 * it failed and either return an error or retry construction, depending on
3799 * If one doesn't exist then insert a new tcon_link struct into the tree and
3800 * try to construct a new one.
3803 cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
3806 uid_t fsuid = current_fsuid();
3807 struct tcon_link *tlink, *newtlink;
3809 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
3810 return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
3812 spin_lock(&cifs_sb->tlink_tree_lock);
3813 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
3815 cifs_get_tlink(tlink);
3816 spin_unlock(&cifs_sb->tlink_tree_lock);
3818 if (tlink == NULL) {
3819 newtlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
3820 if (newtlink == NULL)
3821 return ERR_PTR(-ENOMEM);
3822 newtlink->tl_uid = fsuid;
3823 newtlink->tl_tcon = ERR_PTR(-EACCES);
3824 set_bit(TCON_LINK_PENDING, &newtlink->tl_flags);
3825 set_bit(TCON_LINK_IN_TREE, &newtlink->tl_flags);
3826 cifs_get_tlink(newtlink);
3828 spin_lock(&cifs_sb->tlink_tree_lock);
3829 /* was one inserted after previous search? */
3830 tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
3832 cifs_get_tlink(tlink);
3833 spin_unlock(&cifs_sb->tlink_tree_lock);
3835 goto wait_for_construction;
3838 tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
3839 spin_unlock(&cifs_sb->tlink_tree_lock);
3841 wait_for_construction:
3842 ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING,
3843 cifs_sb_tcon_pending_wait,
3844 TASK_INTERRUPTIBLE);
3846 cifs_put_tlink(tlink);
3847 return ERR_PTR(ret);
3850 /* if it's good, return it */
3851 if (!IS_ERR(tlink->tl_tcon))
3854 /* return error if we tried this already recently */
3855 if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) {
3856 cifs_put_tlink(tlink);
3857 return ERR_PTR(-EACCES);
3860 if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags))
3861 goto wait_for_construction;
3864 tlink->tl_tcon = cifs_construct_tcon(cifs_sb, fsuid);
3865 clear_bit(TCON_LINK_PENDING, &tlink->tl_flags);
3866 wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING);
3868 if (IS_ERR(tlink->tl_tcon)) {
3869 cifs_put_tlink(tlink);
3870 return ERR_PTR(-EACCES);
3877 * periodic workqueue job that scans tcon_tree for a superblock and closes
3881 cifs_prune_tlinks(struct work_struct *work)
3883 struct cifs_sb_info *cifs_sb = container_of(work, struct cifs_sb_info,
3885 struct rb_root *root = &cifs_sb->tlink_tree;
3886 struct rb_node *node = rb_first(root);
3887 struct rb_node *tmp;
3888 struct tcon_link *tlink;
3891 * Because we drop the spinlock in the loop in order to put the tlink
3892 * it's not guarded against removal of links from the tree. The only
3893 * places that remove entries from the tree are this function and
3894 * umounts. Because this function is non-reentrant and is canceled
3895 * before umount can proceed, this is safe.
3897 spin_lock(&cifs_sb->tlink_tree_lock);
3898 node = rb_first(root);
3899 while (node != NULL) {
3901 node = rb_next(tmp);
3902 tlink = rb_entry(tmp, struct tcon_link, tl_rbnode);
3904 if (test_bit(TCON_LINK_MASTER, &tlink->tl_flags) ||
3905 atomic_read(&tlink->tl_count) != 0 ||
3906 time_after(tlink->tl_time + TLINK_IDLE_EXPIRE, jiffies))
3909 cifs_get_tlink(tlink);
3910 clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
3911 rb_erase(tmp, root);
3913 spin_unlock(&cifs_sb->tlink_tree_lock);
3914 cifs_put_tlink(tlink);
3915 spin_lock(&cifs_sb->tlink_tree_lock);
3917 spin_unlock(&cifs_sb->tlink_tree_lock);
3919 queue_delayed_work(system_nrt_wq, &cifs_sb->prune_tlinks,