1 // SPDX-License-Identifier: LGPL-2.1
2 /*
3  *
4  *   Copyright (C) International Business Machines  Corp., 2009, 2013
5  *                 Etersoft, 2012
6  *   Author(s): Steve French (sfrench@us.ibm.com)
7  *              Pavel Shilovsky (pshilovsky@samba.org) 2012
8  *
9  *   Contains the routines for constructing the SMB2 PDUs themselves
10  *
11  */
12 
13  /* SMB2 PDU handling routines here - except for leftovers (eg session setup) */
14  /* Note that there are handle based routines which must be		      */
15  /* treated slightly differently for reconnection purposes since we never     */
16  /* want to reuse a stale file handle and only the caller knows the file info */
17 
18 #include <linux/fs.h>
19 #include <linux/kernel.h>
20 #include <linux/vfs.h>
21 #include <linux/task_io_accounting_ops.h>
22 #include <linux/uaccess.h>
23 #include <linux/uuid.h>
24 #include <linux/pagemap.h>
25 #include <linux/xattr.h>
26 #include <linux/netfs.h>
27 #include <trace/events/netfs.h>
28 #include "cifsglob.h"
29 #include "cifsacl.h"
30 #include "cifsproto.h"
31 #include "smb2proto.h"
32 #include "cifs_unicode.h"
33 #include "cifs_debug.h"
34 #include "ntlmssp.h"
35 #include "../common/smb2status.h"
36 #include "smb2glob.h"
37 #include "cifspdu.h"
38 #include "cifs_spnego.h"
39 #include "smbdirect.h"
40 #include "trace.h"
41 #ifdef CONFIG_CIFS_DFS_UPCALL
42 #include "dfs_cache.h"
43 #endif
44 #include "cached_dir.h"
45 #include "compress.h"
46 #include "fs_context.h"
47 
48 /*
49  *  The following table defines the expected "StructureSize" of SMB2 requests
50  *  in order by SMB2 command.  This is similar to "wct" in SMB/CIFS requests.
51  *
52  *  Note that commands are defined in smb2pdu.h in le16 but the array below is
53  *  indexed by command in host byte order.
54  */
55 static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
56 	/* SMB2_NEGOTIATE */ 36,
57 	/* SMB2_SESSION_SETUP */ 25,
58 	/* SMB2_LOGOFF */ 4,
59 	/* SMB2_TREE_CONNECT */	9,
60 	/* SMB2_TREE_DISCONNECT */ 4,
61 	/* SMB2_CREATE */ 57,
62 	/* SMB2_CLOSE */ 24,
63 	/* SMB2_FLUSH */ 24,
64 	/* SMB2_READ */	49,
65 	/* SMB2_WRITE */ 49,
66 	/* SMB2_LOCK */	48,
67 	/* SMB2_IOCTL */ 57,
68 	/* SMB2_CANCEL */ 4,
69 	/* SMB2_ECHO */ 4,
70 	/* SMB2_QUERY_DIRECTORY */ 33,
71 	/* SMB2_CHANGE_NOTIFY */ 32,
72 	/* SMB2_QUERY_INFO */ 41,
73 	/* SMB2_SET_INFO */ 33,
74 	/* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
75 };
76 
smb3_encryption_required(const struct cifs_tcon * tcon)77 int smb3_encryption_required(const struct cifs_tcon *tcon)
78 {
79 	if (!tcon || !tcon->ses)
80 		return 0;
81 	if ((tcon->ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) ||
82 	    (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA))
83 		return 1;
84 	if (tcon->seal &&
85 	    (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
86 		return 1;
87 	if (((global_secflags & CIFSSEC_MUST_SEAL) == CIFSSEC_MUST_SEAL) &&
88 	    (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
89 		return 1;
90 	return 0;
91 }
92 
93 static void
smb2_hdr_assemble(struct smb2_hdr * shdr,__le16 smb2_cmd,const struct cifs_tcon * tcon,struct TCP_Server_Info * server)94 smb2_hdr_assemble(struct smb2_hdr *shdr, __le16 smb2_cmd,
95 		  const struct cifs_tcon *tcon,
96 		  struct TCP_Server_Info *server)
97 {
98 	struct smb3_hdr_req *smb3_hdr;
99 
100 	shdr->ProtocolId = SMB2_PROTO_NUMBER;
101 	shdr->StructureSize = cpu_to_le16(64);
102 	shdr->Command = smb2_cmd;
103 
104 	if (server) {
105 		/* After reconnect SMB3 must set ChannelSequence on subsequent reqs */
106 		if (server->dialect >= SMB30_PROT_ID) {
107 			smb3_hdr = (struct smb3_hdr_req *)shdr;
108 			/*
109 			 * if primary channel is not set yet, use default
110 			 * channel for chan sequence num
111 			 */
112 			if (SERVER_IS_CHAN(server))
113 				smb3_hdr->ChannelSequence =
114 					cpu_to_le16(server->primary_server->channel_sequence_num);
115 			else
116 				smb3_hdr->ChannelSequence =
117 					cpu_to_le16(server->channel_sequence_num);
118 		}
119 		spin_lock(&server->req_lock);
120 		/* Request up to 10 credits but don't go over the limit. */
121 		if (server->credits >= server->max_credits)
122 			shdr->CreditRequest = cpu_to_le16(0);
123 		else
124 			shdr->CreditRequest = cpu_to_le16(
125 				min_t(int, server->max_credits -
126 						server->credits, 10));
127 		spin_unlock(&server->req_lock);
128 	} else {
129 		shdr->CreditRequest = cpu_to_le16(2);
130 	}
131 	shdr->Id.SyncId.ProcessId = cpu_to_le32((__u16)current->tgid);
132 
133 	if (!tcon)
134 		goto out;
135 
136 	/* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
137 	/* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
138 	if (server && (server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
139 		shdr->CreditCharge = cpu_to_le16(1);
140 	/* else CreditCharge MBZ */
141 
142 	shdr->Id.SyncId.TreeId = cpu_to_le32(tcon->tid);
143 	/* Uid is not converted */
144 	if (tcon->ses)
145 		shdr->SessionId = cpu_to_le64(tcon->ses->Suid);
146 
147 	/*
148 	 * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
149 	 * to pass the path on the Open SMB prefixed by \\server\share.
150 	 * Not sure when we would need to do the augmented path (if ever) and
151 	 * setting this flag breaks the SMB2 open operation since it is
152 	 * illegal to send an empty path name (without \\server\share prefix)
153 	 * when the DFS flag is set in the SMB open header. We could
154 	 * consider setting the flag on all operations other than open
155 	 * but it is safer to net set it for now.
156 	 */
157 /*	if (tcon->share_flags & SHI1005_FLAGS_DFS)
158 		shdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
159 
160 	if (server && server->sign && !smb3_encryption_required(tcon))
161 		shdr->Flags |= SMB2_FLAGS_SIGNED;
162 out:
163 	return;
164 }
165 
166 /* helper function for code reuse */
167 static int
cifs_chan_skip_or_disable(struct cifs_ses * ses,struct TCP_Server_Info * server,bool from_reconnect)168 cifs_chan_skip_or_disable(struct cifs_ses *ses,
169 			  struct TCP_Server_Info *server,
170 			  bool from_reconnect)
171 {
172 	struct TCP_Server_Info *pserver;
173 	unsigned int chan_index;
174 
175 	if (SERVER_IS_CHAN(server)) {
176 		cifs_dbg(VFS,
177 			"server %s does not support multichannel anymore. Skip secondary channel\n",
178 			 ses->server->hostname);
179 
180 		spin_lock(&ses->chan_lock);
181 		chan_index = cifs_ses_get_chan_index(ses, server);
182 		if (chan_index == CIFS_INVAL_CHAN_INDEX) {
183 			spin_unlock(&ses->chan_lock);
184 			goto skip_terminate;
185 		}
186 
187 		ses->chans[chan_index].server = NULL;
188 		server->terminate = true;
189 		spin_unlock(&ses->chan_lock);
190 
191 		/*
192 		 * the above reference of server by channel
193 		 * needs to be dropped without holding chan_lock
194 		 * as cifs_put_tcp_session takes a higher lock
195 		 * i.e. cifs_tcp_ses_lock
196 		 */
197 		cifs_put_tcp_session(server, from_reconnect);
198 
199 		cifs_signal_cifsd_for_reconnect(server, false);
200 
201 		/* mark primary server as needing reconnect */
202 		pserver = server->primary_server;
203 		cifs_signal_cifsd_for_reconnect(pserver, false);
204 skip_terminate:
205 		return -EHOSTDOWN;
206 	}
207 
208 	cifs_server_dbg(VFS,
209 		"server does not support multichannel anymore. Disable all other channels\n");
210 	cifs_disable_secondary_channels(ses);
211 
212 
213 	return 0;
214 }
215 
216 static int
smb2_reconnect(__le16 smb2_command,struct cifs_tcon * tcon,struct TCP_Server_Info * server,bool from_reconnect)217 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon,
218 	       struct TCP_Server_Info *server, bool from_reconnect)
219 {
220 	struct cifs_ses *ses;
221 	int xid;
222 	int rc = 0;
223 
224 	/*
225 	 * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
226 	 * check for tcp and smb session status done differently
227 	 * for those three - in the calling routine.
228 	 */
229 	if (tcon == NULL)
230 		return 0;
231 
232 	if (smb2_command == SMB2_TREE_CONNECT)
233 		return 0;
234 
235 	spin_lock(&tcon->tc_lock);
236 	if (tcon->status == TID_EXITING) {
237 		/*
238 		 * only tree disconnect allowed when disconnecting ...
239 		 */
240 		if (smb2_command != SMB2_TREE_DISCONNECT) {
241 			spin_unlock(&tcon->tc_lock);
242 			cifs_dbg(FYI, "can not send cmd %d while umounting\n",
243 				 smb2_command);
244 			return -ENODEV;
245 		}
246 	}
247 	spin_unlock(&tcon->tc_lock);
248 
249 	ses = tcon->ses;
250 	if (!ses)
251 		return -EIO;
252 	spin_lock(&ses->ses_lock);
253 	if (ses->ses_status == SES_EXITING) {
254 		spin_unlock(&ses->ses_lock);
255 		return -EIO;
256 	}
257 	spin_unlock(&ses->ses_lock);
258 	if (!ses->server || !server)
259 		return -EIO;
260 
261 	spin_lock(&server->srv_lock);
262 	if (server->tcpStatus == CifsNeedReconnect) {
263 		/*
264 		 * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
265 		 * here since they are implicitly done when session drops.
266 		 */
267 		switch (smb2_command) {
268 		/*
269 		 * BB Should we keep oplock break and add flush to exceptions?
270 		 */
271 		case SMB2_TREE_DISCONNECT:
272 		case SMB2_CANCEL:
273 		case SMB2_CLOSE:
274 		case SMB2_OPLOCK_BREAK:
275 			spin_unlock(&server->srv_lock);
276 			return -EAGAIN;
277 		}
278 	}
279 
280 	/* if server is marked for termination, cifsd will cleanup */
281 	if (server->terminate) {
282 		spin_unlock(&server->srv_lock);
283 		return -EHOSTDOWN;
284 	}
285 	spin_unlock(&server->srv_lock);
286 
287 again:
288 	rc = cifs_wait_for_server_reconnect(server, tcon->retry);
289 	if (rc)
290 		return rc;
291 
292 	spin_lock(&ses->chan_lock);
293 	if (!cifs_chan_needs_reconnect(ses, server) && !tcon->need_reconnect) {
294 		spin_unlock(&ses->chan_lock);
295 		return 0;
296 	}
297 	spin_unlock(&ses->chan_lock);
298 	cifs_dbg(FYI, "sess reconnect mask: 0x%lx, tcon reconnect: %d",
299 		 tcon->ses->chans_need_reconnect,
300 		 tcon->need_reconnect);
301 
302 	mutex_lock(&ses->session_mutex);
303 	/*
304 	 * Handle the case where a concurrent thread failed to negotiate or
305 	 * killed a channel.
306 	 */
307 	spin_lock(&server->srv_lock);
308 	switch (server->tcpStatus) {
309 	case CifsExiting:
310 		spin_unlock(&server->srv_lock);
311 		mutex_unlock(&ses->session_mutex);
312 		return -EHOSTDOWN;
313 	case CifsNeedReconnect:
314 		spin_unlock(&server->srv_lock);
315 		mutex_unlock(&ses->session_mutex);
316 		if (!tcon->retry)
317 			return -EHOSTDOWN;
318 		goto again;
319 	default:
320 		break;
321 	}
322 	spin_unlock(&server->srv_lock);
323 
324 	/*
325 	 * need to prevent multiple threads trying to simultaneously
326 	 * reconnect the same SMB session
327 	 */
328 	spin_lock(&ses->ses_lock);
329 	spin_lock(&ses->chan_lock);
330 	if (!cifs_chan_needs_reconnect(ses, server) &&
331 	    ses->ses_status == SES_GOOD) {
332 		spin_unlock(&ses->chan_lock);
333 		spin_unlock(&ses->ses_lock);
334 		/* this means that we only need to tree connect */
335 		if (tcon->need_reconnect)
336 			goto skip_sess_setup;
337 
338 		mutex_unlock(&ses->session_mutex);
339 		goto out;
340 	}
341 	spin_unlock(&ses->chan_lock);
342 	spin_unlock(&ses->ses_lock);
343 
344 	rc = cifs_negotiate_protocol(0, ses, server);
345 	if (rc) {
346 		mutex_unlock(&ses->session_mutex);
347 		if (!tcon->retry)
348 			return -EHOSTDOWN;
349 		goto again;
350 	}
351 	/*
352 	 * if server stopped supporting multichannel
353 	 * and the first channel reconnected, disable all the others.
354 	 */
355 	if (ses->chan_count > 1 &&
356 	    !(server->capabilities & SMB2_GLOBAL_CAP_MULTI_CHANNEL)) {
357 		rc = cifs_chan_skip_or_disable(ses, server,
358 					       from_reconnect);
359 		if (rc) {
360 			mutex_unlock(&ses->session_mutex);
361 			goto out;
362 		}
363 	}
364 
365 	rc = cifs_setup_session(0, ses, server, ses->local_nls);
366 	if ((rc == -EACCES) || (rc == -EKEYEXPIRED) || (rc == -EKEYREVOKED)) {
367 		/*
368 		 * Try alternate password for next reconnect (key rotation
369 		 * could be enabled on the server e.g.) if an alternate
370 		 * password is available and the current password is expired,
371 		 * but do not swap on non pwd related errors like host down
372 		 */
373 		if (ses->password2)
374 			swap(ses->password2, ses->password);
375 	}
376 	if (rc) {
377 		mutex_unlock(&ses->session_mutex);
378 		if (rc == -EACCES && !tcon->retry)
379 			return -EHOSTDOWN;
380 		goto out;
381 	}
382 
383 skip_sess_setup:
384 	if (!tcon->need_reconnect) {
385 		mutex_unlock(&ses->session_mutex);
386 		goto out;
387 	}
388 	cifs_mark_open_files_invalid(tcon);
389 	if (tcon->use_persistent)
390 		tcon->need_reopen_files = true;
391 
392 	rc = cifs_tree_connect(0, tcon);
393 
394 	cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
395 	if (rc) {
396 		/* If sess reconnected but tcon didn't, something strange ... */
397 		mutex_unlock(&ses->session_mutex);
398 		cifs_dbg(VFS, "reconnect tcon failed rc = %d\n", rc);
399 		goto out;
400 	}
401 
402 	spin_lock(&ses->ses_lock);
403 	if (ses->flags & CIFS_SES_FLAG_SCALE_CHANNELS) {
404 		spin_unlock(&ses->ses_lock);
405 		mutex_unlock(&ses->session_mutex);
406 		goto skip_add_channels;
407 	}
408 	ses->flags |= CIFS_SES_FLAG_SCALE_CHANNELS;
409 	spin_unlock(&ses->ses_lock);
410 
411 	if (!rc &&
412 	    (server->capabilities & SMB2_GLOBAL_CAP_MULTI_CHANNEL) &&
413 	    server->ops->query_server_interfaces) {
414 		mutex_unlock(&ses->session_mutex);
415 
416 		/*
417 		 * query server network interfaces, in case they change
418 		 */
419 		xid = get_xid();
420 		rc = server->ops->query_server_interfaces(xid, tcon, false);
421 		free_xid(xid);
422 
423 		if (rc == -EOPNOTSUPP && ses->chan_count > 1) {
424 			/*
425 			 * some servers like Azure SMB server do not advertise
426 			 * that multichannel has been disabled with server
427 			 * capabilities, rather return STATUS_NOT_IMPLEMENTED.
428 			 * treat this as server not supporting multichannel
429 			 */
430 
431 			rc = cifs_chan_skip_or_disable(ses, server,
432 						       from_reconnect);
433 			goto skip_add_channels;
434 		} else if (rc)
435 			cifs_dbg(FYI, "%s: failed to query server interfaces: %d\n",
436 				 __func__, rc);
437 
438 		if (ses->chan_max > ses->chan_count &&
439 		    ses->iface_count &&
440 		    !SERVER_IS_CHAN(server)) {
441 			if (ses->chan_count == 1) {
442 				cifs_server_dbg(VFS, "supports multichannel now\n");
443 				queue_delayed_work(cifsiod_wq, &tcon->query_interfaces,
444 						 (SMB_INTERFACE_POLL_INTERVAL * HZ));
445 			}
446 
447 			cifs_try_adding_channels(ses);
448 		}
449 	} else {
450 		mutex_unlock(&ses->session_mutex);
451 	}
452 
453 skip_add_channels:
454 	spin_lock(&ses->ses_lock);
455 	ses->flags &= ~CIFS_SES_FLAG_SCALE_CHANNELS;
456 	spin_unlock(&ses->ses_lock);
457 
458 	if (smb2_command != SMB2_INTERNAL_CMD)
459 		mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
460 
461 	atomic_inc(&tconInfoReconnectCount);
462 out:
463 	/*
464 	 * Check if handle based operation so we know whether we can continue
465 	 * or not without returning to caller to reset file handle.
466 	 */
467 	/*
468 	 * BB Is flush done by server on drop of tcp session? Should we special
469 	 * case it and skip above?
470 	 */
471 	switch (smb2_command) {
472 	case SMB2_FLUSH:
473 	case SMB2_READ:
474 	case SMB2_WRITE:
475 	case SMB2_LOCK:
476 	case SMB2_QUERY_DIRECTORY:
477 	case SMB2_CHANGE_NOTIFY:
478 	case SMB2_QUERY_INFO:
479 	case SMB2_SET_INFO:
480 	case SMB2_IOCTL:
481 		rc = -EAGAIN;
482 	}
483 	return rc;
484 }
485 
486 static void
fill_small_buf(__le16 smb2_command,struct cifs_tcon * tcon,struct TCP_Server_Info * server,void * buf,unsigned int * total_len)487 fill_small_buf(__le16 smb2_command, struct cifs_tcon *tcon,
488 	       struct TCP_Server_Info *server,
489 	       void *buf,
490 	       unsigned int *total_len)
491 {
492 	struct smb2_pdu *spdu = buf;
493 	/* lookup word count ie StructureSize from table */
494 	__u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_command)];
495 
496 	/*
497 	 * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
498 	 * largest operations (Create)
499 	 */
500 	memset(buf, 0, 256);
501 
502 	smb2_hdr_assemble(&spdu->hdr, smb2_command, tcon, server);
503 	spdu->StructureSize2 = cpu_to_le16(parmsize);
504 
505 	*total_len = parmsize + sizeof(struct smb2_hdr);
506 }
507 
508 /*
509  * Allocate and return pointer to an SMB request hdr, and set basic
510  * SMB information in the SMB header. If the return code is zero, this
511  * function must have filled in request_buf pointer.
512  */
__smb2_plain_req_init(__le16 smb2_command,struct cifs_tcon * tcon,struct TCP_Server_Info * server,void ** request_buf,unsigned int * total_len)513 static int __smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
514 				 struct TCP_Server_Info *server,
515 				 void **request_buf, unsigned int *total_len)
516 {
517 	/* BB eventually switch this to SMB2 specific small buf size */
518 	switch (smb2_command) {
519 	case SMB2_SET_INFO:
520 	case SMB2_QUERY_INFO:
521 		*request_buf = cifs_buf_get();
522 		break;
523 	default:
524 		*request_buf = cifs_small_buf_get();
525 		break;
526 	}
527 	if (*request_buf == NULL) {
528 		/* BB should we add a retry in here if not a writepage? */
529 		return -ENOMEM;
530 	}
531 
532 	fill_small_buf(smb2_command, tcon, server,
533 		       (struct smb2_hdr *)(*request_buf),
534 		       total_len);
535 
536 	if (tcon != NULL) {
537 		uint16_t com_code = le16_to_cpu(smb2_command);
538 		cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
539 		cifs_stats_inc(&tcon->num_smbs_sent);
540 	}
541 
542 	return 0;
543 }
544 
smb2_plain_req_init(__le16 smb2_command,struct cifs_tcon * tcon,struct TCP_Server_Info * server,void ** request_buf,unsigned int * total_len)545 static int smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
546 			       struct TCP_Server_Info *server,
547 			       void **request_buf, unsigned int *total_len)
548 {
549 	int rc;
550 
551 	rc = smb2_reconnect(smb2_command, tcon, server, false);
552 	if (rc)
553 		return rc;
554 
555 	return __smb2_plain_req_init(smb2_command, tcon, server, request_buf,
556 				     total_len);
557 }
558 
smb2_ioctl_req_init(u32 opcode,struct cifs_tcon * tcon,struct TCP_Server_Info * server,void ** request_buf,unsigned int * total_len)559 static int smb2_ioctl_req_init(u32 opcode, struct cifs_tcon *tcon,
560 			       struct TCP_Server_Info *server,
561 			       void **request_buf, unsigned int *total_len)
562 {
563 	/* Skip reconnect only for FSCTL_VALIDATE_NEGOTIATE_INFO IOCTLs */
564 	if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO) {
565 		return __smb2_plain_req_init(SMB2_IOCTL, tcon, server,
566 					     request_buf, total_len);
567 	}
568 	return smb2_plain_req_init(SMB2_IOCTL, tcon, server,
569 				   request_buf, total_len);
570 }
571 
572 /* For explanation of negotiate contexts see MS-SMB2 section 2.2.3.1 */
573 
574 static void
build_preauth_ctxt(struct smb2_preauth_neg_context * pneg_ctxt)575 build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
576 {
577 	pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
578 	pneg_ctxt->DataLength = cpu_to_le16(38);
579 	pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
580 	pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE);
581 	get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE);
582 	pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
583 }
584 
585 static void
build_compression_ctxt(struct smb2_compression_capabilities_context * pneg_ctxt)586 build_compression_ctxt(struct smb2_compression_capabilities_context *pneg_ctxt)
587 {
588 	pneg_ctxt->ContextType = SMB2_COMPRESSION_CAPABILITIES;
589 	pneg_ctxt->DataLength =
590 		cpu_to_le16(sizeof(struct smb2_compression_capabilities_context)
591 			  - sizeof(struct smb2_neg_context));
592 	pneg_ctxt->CompressionAlgorithmCount = cpu_to_le16(3);
593 	pneg_ctxt->CompressionAlgorithms[0] = SMB3_COMPRESS_LZ77;
594 	pneg_ctxt->CompressionAlgorithms[1] = SMB3_COMPRESS_LZ77_HUFF;
595 	pneg_ctxt->CompressionAlgorithms[2] = SMB3_COMPRESS_LZNT1;
596 }
597 
598 static unsigned int
build_signing_ctxt(struct smb2_signing_capabilities * pneg_ctxt)599 build_signing_ctxt(struct smb2_signing_capabilities *pneg_ctxt)
600 {
601 	unsigned int ctxt_len = sizeof(struct smb2_signing_capabilities);
602 	unsigned short num_algs = 1; /* number of signing algorithms sent */
603 
604 	pneg_ctxt->ContextType = SMB2_SIGNING_CAPABILITIES;
605 	/*
606 	 * Context Data length must be rounded to multiple of 8 for some servers
607 	 */
608 	pneg_ctxt->DataLength = cpu_to_le16(ALIGN(sizeof(struct smb2_signing_capabilities) -
609 					    sizeof(struct smb2_neg_context) +
610 					    (num_algs * sizeof(u16)), 8));
611 	pneg_ctxt->SigningAlgorithmCount = cpu_to_le16(num_algs);
612 	pneg_ctxt->SigningAlgorithms[0] = cpu_to_le16(SIGNING_ALG_AES_CMAC);
613 
614 	ctxt_len += sizeof(__le16) * num_algs;
615 	ctxt_len = ALIGN(ctxt_len, 8);
616 	return ctxt_len;
617 	/* TBD add SIGNING_ALG_AES_GMAC and/or SIGNING_ALG_HMAC_SHA256 */
618 }
619 
620 static void
build_encrypt_ctxt(struct smb2_encryption_neg_context * pneg_ctxt)621 build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
622 {
623 	pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
624 	if (require_gcm_256) {
625 		pneg_ctxt->DataLength = cpu_to_le16(4); /* Cipher Count + 1 cipher */
626 		pneg_ctxt->CipherCount = cpu_to_le16(1);
627 		pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES256_GCM;
628 	} else if (enable_gcm_256) {
629 		pneg_ctxt->DataLength = cpu_to_le16(8); /* Cipher Count + 3 ciphers */
630 		pneg_ctxt->CipherCount = cpu_to_le16(3);
631 		pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
632 		pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES256_GCM;
633 		pneg_ctxt->Ciphers[2] = SMB2_ENCRYPTION_AES128_CCM;
634 	} else {
635 		pneg_ctxt->DataLength = cpu_to_le16(6); /* Cipher Count + 2 ciphers */
636 		pneg_ctxt->CipherCount = cpu_to_le16(2);
637 		pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
638 		pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES128_CCM;
639 	}
640 }
641 
642 static unsigned int
build_netname_ctxt(struct smb2_netname_neg_context * pneg_ctxt,char * hostname)643 build_netname_ctxt(struct smb2_netname_neg_context *pneg_ctxt, char *hostname)
644 {
645 	struct nls_table *cp = load_nls_default();
646 
647 	pneg_ctxt->ContextType = SMB2_NETNAME_NEGOTIATE_CONTEXT_ID;
648 
649 	/* copy up to max of first 100 bytes of server name to NetName field */
650 	pneg_ctxt->DataLength = cpu_to_le16(2 * cifs_strtoUTF16(pneg_ctxt->NetName, hostname, 100, cp));
651 	/* context size is DataLength + minimal smb2_neg_context */
652 	return ALIGN(le16_to_cpu(pneg_ctxt->DataLength) + sizeof(struct smb2_neg_context), 8);
653 }
654 
655 static void
build_posix_ctxt(struct smb2_posix_neg_context * pneg_ctxt)656 build_posix_ctxt(struct smb2_posix_neg_context *pneg_ctxt)
657 {
658 	pneg_ctxt->ContextType = SMB2_POSIX_EXTENSIONS_AVAILABLE;
659 	pneg_ctxt->DataLength = cpu_to_le16(POSIX_CTXT_DATA_LEN);
660 	/* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
661 	pneg_ctxt->Name[0] = 0x93;
662 	pneg_ctxt->Name[1] = 0xAD;
663 	pneg_ctxt->Name[2] = 0x25;
664 	pneg_ctxt->Name[3] = 0x50;
665 	pneg_ctxt->Name[4] = 0x9C;
666 	pneg_ctxt->Name[5] = 0xB4;
667 	pneg_ctxt->Name[6] = 0x11;
668 	pneg_ctxt->Name[7] = 0xE7;
669 	pneg_ctxt->Name[8] = 0xB4;
670 	pneg_ctxt->Name[9] = 0x23;
671 	pneg_ctxt->Name[10] = 0x83;
672 	pneg_ctxt->Name[11] = 0xDE;
673 	pneg_ctxt->Name[12] = 0x96;
674 	pneg_ctxt->Name[13] = 0x8B;
675 	pneg_ctxt->Name[14] = 0xCD;
676 	pneg_ctxt->Name[15] = 0x7C;
677 }
678 
679 static void
assemble_neg_contexts(struct smb2_negotiate_req * req,struct TCP_Server_Info * server,unsigned int * total_len)680 assemble_neg_contexts(struct smb2_negotiate_req *req,
681 		      struct TCP_Server_Info *server, unsigned int *total_len)
682 {
683 	unsigned int ctxt_len, neg_context_count;
684 	struct TCP_Server_Info *pserver;
685 	char *pneg_ctxt;
686 	char *hostname;
687 
688 	if (*total_len > 200) {
689 		/* In case length corrupted don't want to overrun smb buffer */
690 		cifs_server_dbg(VFS, "Bad frame length assembling neg contexts\n");
691 		return;
692 	}
693 
694 	/*
695 	 * round up total_len of fixed part of SMB3 negotiate request to 8
696 	 * byte boundary before adding negotiate contexts
697 	 */
698 	*total_len = ALIGN(*total_len, 8);
699 
700 	pneg_ctxt = (*total_len) + (char *)req;
701 	req->NegotiateContextOffset = cpu_to_le32(*total_len);
702 
703 	build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
704 	ctxt_len = ALIGN(sizeof(struct smb2_preauth_neg_context), 8);
705 	*total_len += ctxt_len;
706 	pneg_ctxt += ctxt_len;
707 
708 	build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
709 	ctxt_len = ALIGN(sizeof(struct smb2_encryption_neg_context), 8);
710 	*total_len += ctxt_len;
711 	pneg_ctxt += ctxt_len;
712 
713 	/*
714 	 * secondary channels don't have the hostname field populated
715 	 * use the hostname field in the primary channel instead
716 	 */
717 	pserver = SERVER_IS_CHAN(server) ? server->primary_server : server;
718 	cifs_server_lock(pserver);
719 	hostname = pserver->hostname;
720 	if (hostname && (hostname[0] != 0)) {
721 		ctxt_len = build_netname_ctxt((struct smb2_netname_neg_context *)pneg_ctxt,
722 					      hostname);
723 		*total_len += ctxt_len;
724 		pneg_ctxt += ctxt_len;
725 		neg_context_count = 3;
726 	} else
727 		neg_context_count = 2;
728 	cifs_server_unlock(pserver);
729 
730 	build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt);
731 	*total_len += sizeof(struct smb2_posix_neg_context);
732 	pneg_ctxt += sizeof(struct smb2_posix_neg_context);
733 	neg_context_count++;
734 
735 	if (server->compression.requested) {
736 		build_compression_ctxt((struct smb2_compression_capabilities_context *)
737 				pneg_ctxt);
738 		ctxt_len = ALIGN(sizeof(struct smb2_compression_capabilities_context), 8);
739 		*total_len += ctxt_len;
740 		pneg_ctxt += ctxt_len;
741 		neg_context_count++;
742 	}
743 
744 	if (enable_negotiate_signing) {
745 		ctxt_len = build_signing_ctxt((struct smb2_signing_capabilities *)
746 				pneg_ctxt);
747 		*total_len += ctxt_len;
748 		pneg_ctxt += ctxt_len;
749 		neg_context_count++;
750 	}
751 
752 	/* check for and add transport_capabilities and signing capabilities */
753 	req->NegotiateContextCount = cpu_to_le16(neg_context_count);
754 
755 }
756 
757 /* If invalid preauth context warn but use what we requested, SHA-512 */
decode_preauth_context(struct smb2_preauth_neg_context * ctxt)758 static void decode_preauth_context(struct smb2_preauth_neg_context *ctxt)
759 {
760 	unsigned int len = le16_to_cpu(ctxt->DataLength);
761 
762 	/*
763 	 * Caller checked that DataLength remains within SMB boundary. We still
764 	 * need to confirm that one HashAlgorithms member is accounted for.
765 	 */
766 	if (len < MIN_PREAUTH_CTXT_DATA_LEN) {
767 		pr_warn_once("server sent bad preauth context\n");
768 		return;
769 	} else if (len < MIN_PREAUTH_CTXT_DATA_LEN + le16_to_cpu(ctxt->SaltLength)) {
770 		pr_warn_once("server sent invalid SaltLength\n");
771 		return;
772 	}
773 	if (le16_to_cpu(ctxt->HashAlgorithmCount) != 1)
774 		pr_warn_once("Invalid SMB3 hash algorithm count\n");
775 	if (ctxt->HashAlgorithms != SMB2_PREAUTH_INTEGRITY_SHA512)
776 		pr_warn_once("unknown SMB3 hash algorithm\n");
777 }
778 
decode_compress_ctx(struct TCP_Server_Info * server,struct smb2_compression_capabilities_context * ctxt)779 static void decode_compress_ctx(struct TCP_Server_Info *server,
780 			 struct smb2_compression_capabilities_context *ctxt)
781 {
782 	unsigned int len = le16_to_cpu(ctxt->DataLength);
783 	__le16 alg;
784 
785 	server->compression.enabled = false;
786 
787 	/*
788 	 * Caller checked that DataLength remains within SMB boundary. We still
789 	 * need to confirm that one CompressionAlgorithms member is accounted
790 	 * for.
791 	 */
792 	if (len < 10) {
793 		pr_warn_once("server sent bad compression cntxt\n");
794 		return;
795 	}
796 
797 	if (le16_to_cpu(ctxt->CompressionAlgorithmCount) != 1) {
798 		pr_warn_once("invalid SMB3 compress algorithm count\n");
799 		return;
800 	}
801 
802 	alg = ctxt->CompressionAlgorithms[0];
803 
804 	/* 'NONE' (0) compressor type is never negotiated */
805 	if (alg == 0 || le16_to_cpu(alg) > 3) {
806 		pr_warn_once("invalid compression algorithm '%u'\n", alg);
807 		return;
808 	}
809 
810 	server->compression.alg = alg;
811 	server->compression.enabled = true;
812 }
813 
decode_encrypt_ctx(struct TCP_Server_Info * server,struct smb2_encryption_neg_context * ctxt)814 static int decode_encrypt_ctx(struct TCP_Server_Info *server,
815 			      struct smb2_encryption_neg_context *ctxt)
816 {
817 	unsigned int len = le16_to_cpu(ctxt->DataLength);
818 
819 	cifs_dbg(FYI, "decode SMB3.11 encryption neg context of len %d\n", len);
820 	/*
821 	 * Caller checked that DataLength remains within SMB boundary. We still
822 	 * need to confirm that one Cipher flexible array member is accounted
823 	 * for.
824 	 */
825 	if (len < MIN_ENCRYPT_CTXT_DATA_LEN) {
826 		pr_warn_once("server sent bad crypto ctxt len\n");
827 		return -EINVAL;
828 	}
829 
830 	if (le16_to_cpu(ctxt->CipherCount) != 1) {
831 		pr_warn_once("Invalid SMB3.11 cipher count\n");
832 		return -EINVAL;
833 	}
834 	cifs_dbg(FYI, "SMB311 cipher type:%d\n", le16_to_cpu(ctxt->Ciphers[0]));
835 	if (require_gcm_256) {
836 		if (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES256_GCM) {
837 			cifs_dbg(VFS, "Server does not support requested encryption type (AES256 GCM)\n");
838 			return -EOPNOTSUPP;
839 		}
840 	} else if (ctxt->Ciphers[0] == 0) {
841 		/*
842 		 * e.g. if server only supported AES256_CCM (very unlikely)
843 		 * or server supported no encryption types or had all disabled.
844 		 * Since GLOBAL_CAP_ENCRYPTION will be not set, in the case
845 		 * in which mount requested encryption ("seal") checks later
846 		 * on during tree connection will return proper rc, but if
847 		 * seal not requested by client, since server is allowed to
848 		 * return 0 to indicate no supported cipher, we can't fail here
849 		 */
850 		server->cipher_type = 0;
851 		server->capabilities &= ~SMB2_GLOBAL_CAP_ENCRYPTION;
852 		pr_warn_once("Server does not support requested encryption types\n");
853 		return 0;
854 	} else if ((ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_CCM) &&
855 		   (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_GCM) &&
856 		   (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES256_GCM)) {
857 		/* server returned a cipher we didn't ask for */
858 		pr_warn_once("Invalid SMB3.11 cipher returned\n");
859 		return -EINVAL;
860 	}
861 	server->cipher_type = ctxt->Ciphers[0];
862 	server->capabilities |= SMB2_GLOBAL_CAP_ENCRYPTION;
863 	return 0;
864 }
865 
decode_signing_ctx(struct TCP_Server_Info * server,struct smb2_signing_capabilities * pctxt)866 static void decode_signing_ctx(struct TCP_Server_Info *server,
867 			       struct smb2_signing_capabilities *pctxt)
868 {
869 	unsigned int len = le16_to_cpu(pctxt->DataLength);
870 
871 	/*
872 	 * Caller checked that DataLength remains within SMB boundary. We still
873 	 * need to confirm that one SigningAlgorithms flexible array member is
874 	 * accounted for.
875 	 */
876 	if ((len < 4) || (len > 16)) {
877 		pr_warn_once("server sent bad signing negcontext\n");
878 		return;
879 	}
880 	if (le16_to_cpu(pctxt->SigningAlgorithmCount) != 1) {
881 		pr_warn_once("Invalid signing algorithm count\n");
882 		return;
883 	}
884 	if (le16_to_cpu(pctxt->SigningAlgorithms[0]) > 2) {
885 		pr_warn_once("unknown signing algorithm\n");
886 		return;
887 	}
888 
889 	server->signing_negotiated = true;
890 	server->signing_algorithm = le16_to_cpu(pctxt->SigningAlgorithms[0]);
891 	cifs_dbg(FYI, "signing algorithm %d chosen\n",
892 		     server->signing_algorithm);
893 }
894 
895 
smb311_decode_neg_context(struct smb2_negotiate_rsp * rsp,struct TCP_Server_Info * server,unsigned int len_of_smb)896 static int smb311_decode_neg_context(struct smb2_negotiate_rsp *rsp,
897 				     struct TCP_Server_Info *server,
898 				     unsigned int len_of_smb)
899 {
900 	struct smb2_neg_context *pctx;
901 	unsigned int offset = le32_to_cpu(rsp->NegotiateContextOffset);
902 	unsigned int ctxt_cnt = le16_to_cpu(rsp->NegotiateContextCount);
903 	unsigned int len_of_ctxts, i;
904 	int rc = 0;
905 
906 	cifs_dbg(FYI, "decoding %d negotiate contexts\n", ctxt_cnt);
907 	if (len_of_smb <= offset) {
908 		cifs_server_dbg(VFS, "Invalid response: negotiate context offset\n");
909 		return -EINVAL;
910 	}
911 
912 	len_of_ctxts = len_of_smb - offset;
913 
914 	for (i = 0; i < ctxt_cnt; i++) {
915 		int clen;
916 		/* check that offset is not beyond end of SMB */
917 		if (len_of_ctxts < sizeof(struct smb2_neg_context))
918 			break;
919 
920 		pctx = (struct smb2_neg_context *)(offset + (char *)rsp);
921 		clen = sizeof(struct smb2_neg_context)
922 			+ le16_to_cpu(pctx->DataLength);
923 		/*
924 		 * 2.2.4 SMB2 NEGOTIATE Response
925 		 * Subsequent negotiate contexts MUST appear at the first 8-byte
926 		 * aligned offset following the previous negotiate context.
927 		 */
928 		if (i + 1 != ctxt_cnt)
929 			clen = ALIGN(clen, 8);
930 		if (clen > len_of_ctxts)
931 			break;
932 
933 		if (pctx->ContextType == SMB2_PREAUTH_INTEGRITY_CAPABILITIES)
934 			decode_preauth_context(
935 				(struct smb2_preauth_neg_context *)pctx);
936 		else if (pctx->ContextType == SMB2_ENCRYPTION_CAPABILITIES)
937 			rc = decode_encrypt_ctx(server,
938 				(struct smb2_encryption_neg_context *)pctx);
939 		else if (pctx->ContextType == SMB2_COMPRESSION_CAPABILITIES)
940 			decode_compress_ctx(server,
941 				(struct smb2_compression_capabilities_context *)pctx);
942 		else if (pctx->ContextType == SMB2_POSIX_EXTENSIONS_AVAILABLE)
943 			server->posix_ext_supported = true;
944 		else if (pctx->ContextType == SMB2_SIGNING_CAPABILITIES)
945 			decode_signing_ctx(server,
946 				(struct smb2_signing_capabilities *)pctx);
947 		else
948 			cifs_server_dbg(VFS, "unknown negcontext of type %d ignored\n",
949 				le16_to_cpu(pctx->ContextType));
950 		if (rc)
951 			break;
952 
953 		offset += clen;
954 		len_of_ctxts -= clen;
955 	}
956 	return rc;
957 }
958 
959 static struct create_posix *
create_posix_buf(umode_t mode)960 create_posix_buf(umode_t mode)
961 {
962 	struct create_posix *buf;
963 
964 	buf = kzalloc(sizeof(struct create_posix),
965 			GFP_KERNEL);
966 	if (!buf)
967 		return NULL;
968 
969 	buf->ccontext.DataOffset =
970 		cpu_to_le16(offsetof(struct create_posix, Mode));
971 	buf->ccontext.DataLength = cpu_to_le32(4);
972 	buf->ccontext.NameOffset =
973 		cpu_to_le16(offsetof(struct create_posix, Name));
974 	buf->ccontext.NameLength = cpu_to_le16(16);
975 
976 	/* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
977 	buf->Name[0] = 0x93;
978 	buf->Name[1] = 0xAD;
979 	buf->Name[2] = 0x25;
980 	buf->Name[3] = 0x50;
981 	buf->Name[4] = 0x9C;
982 	buf->Name[5] = 0xB4;
983 	buf->Name[6] = 0x11;
984 	buf->Name[7] = 0xE7;
985 	buf->Name[8] = 0xB4;
986 	buf->Name[9] = 0x23;
987 	buf->Name[10] = 0x83;
988 	buf->Name[11] = 0xDE;
989 	buf->Name[12] = 0x96;
990 	buf->Name[13] = 0x8B;
991 	buf->Name[14] = 0xCD;
992 	buf->Name[15] = 0x7C;
993 	buf->Mode = cpu_to_le32(mode);
994 	cifs_dbg(FYI, "mode on posix create 0%o\n", mode);
995 	return buf;
996 }
997 
998 static int
add_posix_context(struct kvec * iov,unsigned int * num_iovec,umode_t mode)999 add_posix_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode)
1000 {
1001 	unsigned int num = *num_iovec;
1002 
1003 	iov[num].iov_base = create_posix_buf(mode);
1004 	if (mode == ACL_NO_MODE)
1005 		cifs_dbg(FYI, "%s: no mode\n", __func__);
1006 	if (iov[num].iov_base == NULL)
1007 		return -ENOMEM;
1008 	iov[num].iov_len = sizeof(struct create_posix);
1009 	*num_iovec = num + 1;
1010 	return 0;
1011 }
1012 
1013 
1014 /*
1015  *
1016  *	SMB2 Worker functions follow:
1017  *
1018  *	The general structure of the worker functions is:
1019  *	1) Call smb2_init (assembles SMB2 header)
1020  *	2) Initialize SMB2 command specific fields in fixed length area of SMB
1021  *	3) Call smb_sendrcv2 (sends request on socket and waits for response)
1022  *	4) Decode SMB2 command specific fields in the fixed length area
1023  *	5) Decode variable length data area (if any for this SMB2 command type)
1024  *	6) Call free smb buffer
1025  *	7) return
1026  *
1027  */
1028 
1029 int
SMB2_negotiate(const unsigned int xid,struct cifs_ses * ses,struct TCP_Server_Info * server)1030 SMB2_negotiate(const unsigned int xid,
1031 	       struct cifs_ses *ses,
1032 	       struct TCP_Server_Info *server)
1033 {
1034 	struct smb_rqst rqst;
1035 	struct smb2_negotiate_req *req;
1036 	struct smb2_negotiate_rsp *rsp;
1037 	struct kvec iov[1];
1038 	struct kvec rsp_iov;
1039 	int rc;
1040 	int resp_buftype;
1041 	int blob_offset, blob_length;
1042 	char *security_blob;
1043 	int flags = CIFS_NEG_OP;
1044 	unsigned int total_len;
1045 
1046 	cifs_dbg(FYI, "Negotiate protocol\n");
1047 
1048 	if (!server) {
1049 		WARN(1, "%s: server is NULL!\n", __func__);
1050 		return -EIO;
1051 	}
1052 
1053 	rc = smb2_plain_req_init(SMB2_NEGOTIATE, NULL, server,
1054 				 (void **) &req, &total_len);
1055 	if (rc)
1056 		return rc;
1057 
1058 	req->hdr.SessionId = 0;
1059 
1060 	memset(server->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
1061 	memset(ses->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
1062 
1063 	if (strcmp(server->vals->version_string,
1064 		   SMB3ANY_VERSION_STRING) == 0) {
1065 		req->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
1066 		req->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
1067 		req->Dialects[2] = cpu_to_le16(SMB311_PROT_ID);
1068 		req->DialectCount = cpu_to_le16(3);
1069 		total_len += 6;
1070 	} else if (strcmp(server->vals->version_string,
1071 		   SMBDEFAULT_VERSION_STRING) == 0) {
1072 		req->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
1073 		req->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
1074 		req->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
1075 		req->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
1076 		req->DialectCount = cpu_to_le16(4);
1077 		total_len += 8;
1078 	} else {
1079 		/* otherwise send specific dialect */
1080 		req->Dialects[0] = cpu_to_le16(server->vals->protocol_id);
1081 		req->DialectCount = cpu_to_le16(1);
1082 		total_len += 2;
1083 	}
1084 
1085 	/* only one of SMB2 signing flags may be set in SMB2 request */
1086 	if (ses->sign)
1087 		req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
1088 	else if (global_secflags & CIFSSEC_MAY_SIGN)
1089 		req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
1090 	else
1091 		req->SecurityMode = 0;
1092 
1093 	req->Capabilities = cpu_to_le32(server->vals->req_capabilities);
1094 	if (ses->chan_max > 1)
1095 		req->Capabilities |= cpu_to_le32(SMB2_GLOBAL_CAP_MULTI_CHANNEL);
1096 
1097 	/* ClientGUID must be zero for SMB2.02 dialect */
1098 	if (server->vals->protocol_id == SMB20_PROT_ID)
1099 		memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
1100 	else {
1101 		memcpy(req->ClientGUID, server->client_guid,
1102 			SMB2_CLIENT_GUID_SIZE);
1103 		if ((server->vals->protocol_id == SMB311_PROT_ID) ||
1104 		    (strcmp(server->vals->version_string,
1105 		     SMB3ANY_VERSION_STRING) == 0) ||
1106 		    (strcmp(server->vals->version_string,
1107 		     SMBDEFAULT_VERSION_STRING) == 0))
1108 			assemble_neg_contexts(req, server, &total_len);
1109 	}
1110 	iov[0].iov_base = (char *)req;
1111 	iov[0].iov_len = total_len;
1112 
1113 	memset(&rqst, 0, sizeof(struct smb_rqst));
1114 	rqst.rq_iov = iov;
1115 	rqst.rq_nvec = 1;
1116 
1117 	rc = cifs_send_recv(xid, ses, server,
1118 			    &rqst, &resp_buftype, flags, &rsp_iov);
1119 	cifs_small_buf_release(req);
1120 	rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base;
1121 	/*
1122 	 * No tcon so can't do
1123 	 * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1124 	 */
1125 	if (rc == -EOPNOTSUPP) {
1126 		cifs_server_dbg(VFS, "Dialect not supported by server. Consider  specifying vers=1.0 or vers=2.0 on mount for accessing older servers\n");
1127 		goto neg_exit;
1128 	} else if (rc != 0)
1129 		goto neg_exit;
1130 
1131 	rc = -EIO;
1132 	if (strcmp(server->vals->version_string,
1133 		   SMB3ANY_VERSION_STRING) == 0) {
1134 		if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
1135 			cifs_server_dbg(VFS,
1136 				"SMB2 dialect returned but not requested\n");
1137 			goto neg_exit;
1138 		} else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
1139 			cifs_server_dbg(VFS,
1140 				"SMB2.1 dialect returned but not requested\n");
1141 			goto neg_exit;
1142 		} else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
1143 			/* ops set to 3.0 by default for default so update */
1144 			server->ops = &smb311_operations;
1145 			server->vals = &smb311_values;
1146 		}
1147 	} else if (strcmp(server->vals->version_string,
1148 		   SMBDEFAULT_VERSION_STRING) == 0) {
1149 		if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
1150 			cifs_server_dbg(VFS,
1151 				"SMB2 dialect returned but not requested\n");
1152 			goto neg_exit;
1153 		} else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
1154 			/* ops set to 3.0 by default for default so update */
1155 			server->ops = &smb21_operations;
1156 			server->vals = &smb21_values;
1157 		} else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
1158 			server->ops = &smb311_operations;
1159 			server->vals = &smb311_values;
1160 		}
1161 	} else if (le16_to_cpu(rsp->DialectRevision) !=
1162 				server->vals->protocol_id) {
1163 		/* if requested single dialect ensure returned dialect matched */
1164 		cifs_server_dbg(VFS, "Invalid 0x%x dialect returned: not requested\n",
1165 				le16_to_cpu(rsp->DialectRevision));
1166 		goto neg_exit;
1167 	}
1168 
1169 	cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
1170 
1171 	if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
1172 		cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
1173 	else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
1174 		cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
1175 	else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
1176 		cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
1177 	else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
1178 		cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
1179 	else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
1180 		cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
1181 	else {
1182 		cifs_server_dbg(VFS, "Invalid dialect returned by server 0x%x\n",
1183 				le16_to_cpu(rsp->DialectRevision));
1184 		goto neg_exit;
1185 	}
1186 
1187 	rc = 0;
1188 	server->dialect = le16_to_cpu(rsp->DialectRevision);
1189 
1190 	/*
1191 	 * Keep a copy of the hash after negprot. This hash will be
1192 	 * the starting hash value for all sessions made from this
1193 	 * server.
1194 	 */
1195 	memcpy(server->preauth_sha_hash, ses->preauth_sha_hash,
1196 	       SMB2_PREAUTH_HASH_SIZE);
1197 
1198 	/* SMB2 only has an extended negflavor */
1199 	server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
1200 	/* set it to the maximum buffer size value we can send with 1 credit */
1201 	server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
1202 			       SMB2_MAX_BUFFER_SIZE);
1203 	server->max_read = le32_to_cpu(rsp->MaxReadSize);
1204 	server->max_write = le32_to_cpu(rsp->MaxWriteSize);
1205 	server->sec_mode = le16_to_cpu(rsp->SecurityMode);
1206 	if ((server->sec_mode & SMB2_SEC_MODE_FLAGS_ALL) != server->sec_mode)
1207 		cifs_dbg(FYI, "Server returned unexpected security mode 0x%x\n",
1208 				server->sec_mode);
1209 	server->capabilities = le32_to_cpu(rsp->Capabilities);
1210 	/* Internal types */
1211 	server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
1212 
1213 	/*
1214 	 * SMB3.0 supports only 1 cipher and doesn't have a encryption neg context
1215 	 * Set the cipher type manually.
1216 	 */
1217 	if ((server->dialect == SMB30_PROT_ID ||
1218 	     server->dialect == SMB302_PROT_ID) &&
1219 	    (server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1220 		server->cipher_type = SMB2_ENCRYPTION_AES128_CCM;
1221 
1222 	security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
1223 					       (struct smb2_hdr *)rsp);
1224 	/*
1225 	 * See MS-SMB2 section 2.2.4: if no blob, client picks default which
1226 	 * for us will be
1227 	 *	ses->sectype = RawNTLMSSP;
1228 	 * but for time being this is our only auth choice so doesn't matter.
1229 	 * We just found a server which sets blob length to zero expecting raw.
1230 	 */
1231 	if (blob_length == 0) {
1232 		cifs_dbg(FYI, "missing security blob on negprot\n");
1233 		server->sec_ntlmssp = true;
1234 	}
1235 
1236 	rc = cifs_enable_signing(server, ses->sign);
1237 	if (rc)
1238 		goto neg_exit;
1239 	if (blob_length) {
1240 		rc = decode_negTokenInit(security_blob, blob_length, server);
1241 		if (rc == 1)
1242 			rc = 0;
1243 		else if (rc == 0)
1244 			rc = -EIO;
1245 	}
1246 
1247 	if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
1248 		if (rsp->NegotiateContextCount)
1249 			rc = smb311_decode_neg_context(rsp, server,
1250 						       rsp_iov.iov_len);
1251 		else
1252 			cifs_server_dbg(VFS, "Missing expected negotiate contexts\n");
1253 	}
1254 
1255 	if (server->cipher_type && !rc)
1256 		rc = smb3_crypto_aead_allocate(server);
1257 neg_exit:
1258 	free_rsp_buf(resp_buftype, rsp);
1259 	return rc;
1260 }
1261 
smb3_validate_negotiate(const unsigned int xid,struct cifs_tcon * tcon)1262 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
1263 {
1264 	int rc;
1265 	struct validate_negotiate_info_req *pneg_inbuf;
1266 	struct validate_negotiate_info_rsp *pneg_rsp = NULL;
1267 	u32 rsplen;
1268 	u32 inbuflen; /* max of 4 dialects */
1269 	struct TCP_Server_Info *server = tcon->ses->server;
1270 
1271 	cifs_dbg(FYI, "validate negotiate\n");
1272 
1273 	/* In SMB3.11 preauth integrity supersedes validate negotiate */
1274 	if (server->dialect == SMB311_PROT_ID)
1275 		return 0;
1276 
1277 	/*
1278 	 * validation ioctl must be signed, so no point sending this if we
1279 	 * can not sign it (ie are not known user).  Even if signing is not
1280 	 * required (enabled but not negotiated), in those cases we selectively
1281 	 * sign just this, the first and only signed request on a connection.
1282 	 * Having validation of negotiate info  helps reduce attack vectors.
1283 	 */
1284 	if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
1285 		return 0; /* validation requires signing */
1286 
1287 	if (tcon->ses->user_name == NULL) {
1288 		cifs_dbg(FYI, "Can't validate negotiate: null user mount\n");
1289 		return 0; /* validation requires signing */
1290 	}
1291 
1292 	if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)
1293 		cifs_tcon_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n");
1294 
1295 	pneg_inbuf = kmalloc(sizeof(*pneg_inbuf), GFP_NOFS);
1296 	if (!pneg_inbuf)
1297 		return -ENOMEM;
1298 
1299 	pneg_inbuf->Capabilities =
1300 			cpu_to_le32(server->vals->req_capabilities);
1301 	if (tcon->ses->chan_max > 1)
1302 		pneg_inbuf->Capabilities |= cpu_to_le32(SMB2_GLOBAL_CAP_MULTI_CHANNEL);
1303 
1304 	memcpy(pneg_inbuf->Guid, server->client_guid,
1305 					SMB2_CLIENT_GUID_SIZE);
1306 
1307 	if (tcon->ses->sign)
1308 		pneg_inbuf->SecurityMode =
1309 			cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
1310 	else if (global_secflags & CIFSSEC_MAY_SIGN)
1311 		pneg_inbuf->SecurityMode =
1312 			cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
1313 	else
1314 		pneg_inbuf->SecurityMode = 0;
1315 
1316 
1317 	if (strcmp(server->vals->version_string,
1318 		SMB3ANY_VERSION_STRING) == 0) {
1319 		pneg_inbuf->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
1320 		pneg_inbuf->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
1321 		pneg_inbuf->Dialects[2] = cpu_to_le16(SMB311_PROT_ID);
1322 		pneg_inbuf->DialectCount = cpu_to_le16(3);
1323 		/* SMB 2.1 not included so subtract one dialect from len */
1324 		inbuflen = sizeof(*pneg_inbuf) -
1325 				(sizeof(pneg_inbuf->Dialects[0]));
1326 	} else if (strcmp(server->vals->version_string,
1327 		SMBDEFAULT_VERSION_STRING) == 0) {
1328 		pneg_inbuf->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
1329 		pneg_inbuf->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
1330 		pneg_inbuf->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
1331 		pneg_inbuf->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
1332 		pneg_inbuf->DialectCount = cpu_to_le16(4);
1333 		/* structure is big enough for 4 dialects */
1334 		inbuflen = sizeof(*pneg_inbuf);
1335 	} else {
1336 		/* otherwise specific dialect was requested */
1337 		pneg_inbuf->Dialects[0] =
1338 			cpu_to_le16(server->vals->protocol_id);
1339 		pneg_inbuf->DialectCount = cpu_to_le16(1);
1340 		/* structure is big enough for 4 dialects, sending only 1 */
1341 		inbuflen = sizeof(*pneg_inbuf) -
1342 				sizeof(pneg_inbuf->Dialects[0]) * 3;
1343 	}
1344 
1345 	rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
1346 		FSCTL_VALIDATE_NEGOTIATE_INFO,
1347 		(char *)pneg_inbuf, inbuflen, CIFSMaxBufSize,
1348 		(char **)&pneg_rsp, &rsplen);
1349 	if (rc == -EOPNOTSUPP) {
1350 		/*
1351 		 * Old Windows versions or Netapp SMB server can return
1352 		 * not supported error. Client should accept it.
1353 		 */
1354 		cifs_tcon_dbg(VFS, "Server does not support validate negotiate\n");
1355 		rc = 0;
1356 		goto out_free_inbuf;
1357 	} else if (rc != 0) {
1358 		cifs_tcon_dbg(VFS, "validate protocol negotiate failed: %d\n",
1359 			      rc);
1360 		rc = -EIO;
1361 		goto out_free_inbuf;
1362 	}
1363 
1364 	rc = -EIO;
1365 	if (rsplen != sizeof(*pneg_rsp)) {
1366 		cifs_tcon_dbg(VFS, "Invalid protocol negotiate response size: %d\n",
1367 			      rsplen);
1368 
1369 		/* relax check since Mac returns max bufsize allowed on ioctl */
1370 		if (rsplen > CIFSMaxBufSize || rsplen < sizeof(*pneg_rsp))
1371 			goto out_free_rsp;
1372 	}
1373 
1374 	/* check validate negotiate info response matches what we got earlier */
1375 	if (pneg_rsp->Dialect != cpu_to_le16(server->dialect))
1376 		goto vneg_out;
1377 
1378 	if (pneg_rsp->SecurityMode != cpu_to_le16(server->sec_mode))
1379 		goto vneg_out;
1380 
1381 	/* do not validate server guid because not saved at negprot time yet */
1382 
1383 	if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
1384 	      SMB2_LARGE_FILES) != server->capabilities)
1385 		goto vneg_out;
1386 
1387 	/* validate negotiate successful */
1388 	rc = 0;
1389 	cifs_dbg(FYI, "validate negotiate info successful\n");
1390 	goto out_free_rsp;
1391 
1392 vneg_out:
1393 	cifs_tcon_dbg(VFS, "protocol revalidation - security settings mismatch\n");
1394 out_free_rsp:
1395 	kfree(pneg_rsp);
1396 out_free_inbuf:
1397 	kfree(pneg_inbuf);
1398 	return rc;
1399 }
1400 
1401 enum securityEnum
smb2_select_sectype(struct TCP_Server_Info * server,enum securityEnum requested)1402 smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
1403 {
1404 	switch (requested) {
1405 	case Kerberos:
1406 	case RawNTLMSSP:
1407 		return requested;
1408 	case NTLMv2:
1409 		return RawNTLMSSP;
1410 	case Unspecified:
1411 		if (server->sec_ntlmssp &&
1412 			(global_secflags & CIFSSEC_MAY_NTLMSSP))
1413 			return RawNTLMSSP;
1414 		if ((server->sec_kerberos || server->sec_mskerberos || server->sec_iakerb) &&
1415 			(global_secflags & CIFSSEC_MAY_KRB5))
1416 			return Kerberos;
1417 		fallthrough;
1418 	default:
1419 		return Unspecified;
1420 	}
1421 }
1422 
1423 struct SMB2_sess_data {
1424 	unsigned int xid;
1425 	struct cifs_ses *ses;
1426 	struct TCP_Server_Info *server;
1427 	struct nls_table *nls_cp;
1428 	void (*func)(struct SMB2_sess_data *);
1429 	int result;
1430 	u64 previous_session;
1431 
1432 	/* we will send the SMB in three pieces:
1433 	 * a fixed length beginning part, an optional
1434 	 * SPNEGO blob (which can be zero length), and a
1435 	 * last part which will include the strings
1436 	 * and rest of bcc area. This allows us to avoid
1437 	 * a large buffer 17K allocation
1438 	 */
1439 	int buf0_type;
1440 	struct kvec iov[2];
1441 };
1442 
1443 static int
SMB2_sess_alloc_buffer(struct SMB2_sess_data * sess_data)1444 SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
1445 {
1446 	int rc;
1447 	struct cifs_ses *ses = sess_data->ses;
1448 	struct TCP_Server_Info *server = sess_data->server;
1449 	struct smb2_sess_setup_req *req;
1450 	unsigned int total_len;
1451 	bool is_binding = false;
1452 
1453 	rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, server,
1454 				 (void **) &req,
1455 				 &total_len);
1456 	if (rc)
1457 		return rc;
1458 
1459 	spin_lock(&ses->ses_lock);
1460 	is_binding = (ses->ses_status == SES_GOOD);
1461 	spin_unlock(&ses->ses_lock);
1462 
1463 	if (is_binding) {
1464 		req->hdr.SessionId = cpu_to_le64(ses->Suid);
1465 		req->hdr.Flags |= SMB2_FLAGS_SIGNED;
1466 		req->PreviousSessionId = 0;
1467 		req->Flags = SMB2_SESSION_REQ_FLAG_BINDING;
1468 		cifs_dbg(FYI, "Binding to sess id: %llx\n", ses->Suid);
1469 	} else {
1470 		/* First session, not a reauthenticate */
1471 		req->hdr.SessionId = 0;
1472 		/*
1473 		 * if reconnect, we need to send previous sess id
1474 		 * otherwise it is 0
1475 		 */
1476 		req->PreviousSessionId = cpu_to_le64(sess_data->previous_session);
1477 		req->Flags = 0; /* MBZ */
1478 		cifs_dbg(FYI, "Fresh session. Previous: %llx\n",
1479 			 sess_data->previous_session);
1480 	}
1481 
1482 	/* enough to enable echos and oplocks and one max size write */
1483 	if (server->credits >= server->max_credits)
1484 		req->hdr.CreditRequest = cpu_to_le16(0);
1485 	else
1486 		req->hdr.CreditRequest = cpu_to_le16(
1487 			min_t(int, server->max_credits -
1488 			      server->credits, 130));
1489 
1490 	/* only one of SMB2 signing flags may be set in SMB2 request */
1491 	if (server->sign)
1492 		req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
1493 	else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
1494 		req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
1495 	else
1496 		req->SecurityMode = 0;
1497 
1498 #ifdef CONFIG_CIFS_DFS_UPCALL
1499 	req->Capabilities = cpu_to_le32(SMB2_GLOBAL_CAP_DFS);
1500 #else
1501 	req->Capabilities = 0;
1502 #endif /* DFS_UPCALL */
1503 
1504 	req->Channel = 0; /* MBZ */
1505 
1506 	sess_data->iov[0].iov_base = (char *)req;
1507 	/* 1 for pad */
1508 	sess_data->iov[0].iov_len = total_len - 1;
1509 	/*
1510 	 * This variable will be used to clear the buffer
1511 	 * allocated above in case of any error in the calling function.
1512 	 */
1513 	sess_data->buf0_type = CIFS_SMALL_BUFFER;
1514 
1515 	return 0;
1516 }
1517 
1518 static void
SMB2_sess_free_buffer(struct SMB2_sess_data * sess_data)1519 SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)
1520 {
1521 	struct kvec *iov = sess_data->iov;
1522 
1523 	/* iov[1] is already freed by caller */
1524 	if (sess_data->buf0_type != CIFS_NO_BUFFER && iov[0].iov_base)
1525 		memzero_explicit(iov[0].iov_base, iov[0].iov_len);
1526 
1527 	free_rsp_buf(sess_data->buf0_type, iov[0].iov_base);
1528 	sess_data->buf0_type = CIFS_NO_BUFFER;
1529 }
1530 
1531 static int
SMB2_sess_sendreceive(struct SMB2_sess_data * sess_data)1532 SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
1533 {
1534 	int rc;
1535 	struct smb_rqst rqst;
1536 	struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
1537 	struct kvec rsp_iov = { NULL, 0 };
1538 
1539 	/* Testing shows that buffer offset must be at location of Buffer[0] */
1540 	req->SecurityBufferOffset =
1541 		cpu_to_le16(sizeof(struct smb2_sess_setup_req));
1542 	req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);
1543 
1544 	memset(&rqst, 0, sizeof(struct smb_rqst));
1545 	rqst.rq_iov = sess_data->iov;
1546 	rqst.rq_nvec = 2;
1547 
1548 	/* BB add code to build os and lm fields */
1549 	rc = cifs_send_recv(sess_data->xid, sess_data->ses,
1550 			    sess_data->server,
1551 			    &rqst,
1552 			    &sess_data->buf0_type,
1553 			    CIFS_LOG_ERROR | CIFS_SESS_OP, &rsp_iov);
1554 	cifs_small_buf_release(sess_data->iov[0].iov_base);
1555 	if (rc == 0)
1556 		sess_data->ses->expired_pwd = false;
1557 	else if ((rc == -EACCES) || (rc == -EKEYEXPIRED) || (rc == -EKEYREVOKED)) {
1558 		if (sess_data->ses->expired_pwd == false)
1559 			trace_smb3_key_expired(sess_data->server->hostname,
1560 					       sess_data->ses->user_name,
1561 					       sess_data->server->conn_id,
1562 					       &sess_data->server->dstaddr, rc);
1563 		sess_data->ses->expired_pwd = true;
1564 	}
1565 
1566 	memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
1567 
1568 	return rc;
1569 }
1570 
1571 static int
SMB2_sess_establish_session(struct SMB2_sess_data * sess_data)1572 SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)
1573 {
1574 	int rc = 0;
1575 	struct cifs_ses *ses = sess_data->ses;
1576 	struct TCP_Server_Info *server = sess_data->server;
1577 
1578 	cifs_server_lock(server);
1579 	if (server->ops->generate_signingkey) {
1580 		rc = server->ops->generate_signingkey(ses, server);
1581 		if (rc) {
1582 			cifs_dbg(FYI,
1583 				"SMB3 session key generation failed\n");
1584 			cifs_server_unlock(server);
1585 			return rc;
1586 		}
1587 	}
1588 	if (!server->session_estab) {
1589 		server->sequence_number = 0x2;
1590 		server->session_estab = true;
1591 	}
1592 	cifs_server_unlock(server);
1593 
1594 	cifs_dbg(FYI, "SMB2/3 session established successfully\n");
1595 	return rc;
1596 }
1597 
1598 #ifdef CONFIG_CIFS_UPCALL
1599 static void
SMB2_auth_kerberos(struct SMB2_sess_data * sess_data)1600 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1601 {
1602 	int rc;
1603 	struct cifs_ses *ses = sess_data->ses;
1604 	struct TCP_Server_Info *server = sess_data->server;
1605 	struct cifs_spnego_msg *msg;
1606 	struct key *spnego_key = NULL;
1607 	struct smb2_sess_setup_rsp *rsp = NULL;
1608 	bool is_binding = false;
1609 
1610 	rc = SMB2_sess_alloc_buffer(sess_data);
1611 	if (rc)
1612 		goto out;
1613 
1614 	spnego_key = cifs_get_spnego_key(ses, server);
1615 	if (IS_ERR(spnego_key)) {
1616 		rc = PTR_ERR(spnego_key);
1617 		if (rc == -ENOKEY)
1618 			cifs_dbg(VFS, "Verify user has a krb5 ticket and keyutils is installed\n");
1619 		spnego_key = NULL;
1620 		goto out;
1621 	}
1622 
1623 	msg = spnego_key->payload.data[0];
1624 	/*
1625 	 * check version field to make sure that cifs.upcall is
1626 	 * sending us a response in an expected form
1627 	 */
1628 	if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1629 		cifs_dbg(VFS, "bad cifs.upcall version. Expected %d got %d\n",
1630 			 CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1631 		rc = -EKEYREJECTED;
1632 		goto out_put_spnego_key;
1633 	}
1634 
1635 	spin_lock(&ses->ses_lock);
1636 	is_binding = (ses->ses_status == SES_GOOD);
1637 	spin_unlock(&ses->ses_lock);
1638 
1639 	/* keep session key if binding */
1640 	if (!is_binding) {
1641 		kfree_sensitive(ses->auth_key.response);
1642 		ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1643 						 GFP_KERNEL);
1644 		if (!ses->auth_key.response) {
1645 			cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory\n",
1646 				 msg->sesskey_len);
1647 			rc = -ENOMEM;
1648 			goto out_put_spnego_key;
1649 		}
1650 		ses->auth_key.len = msg->sesskey_len;
1651 	}
1652 
1653 	sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1654 	sess_data->iov[1].iov_len = msg->secblob_len;
1655 
1656 	rc = SMB2_sess_sendreceive(sess_data);
1657 	if (rc)
1658 		goto out_put_spnego_key;
1659 
1660 	rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1661 	/* keep session id and flags if binding */
1662 	if (!is_binding) {
1663 		ses->Suid = le64_to_cpu(rsp->hdr.SessionId);
1664 		ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1665 	}
1666 
1667 	rc = SMB2_sess_establish_session(sess_data);
1668 out_put_spnego_key:
1669 	key_invalidate(spnego_key);
1670 	key_put(spnego_key);
1671 	if (rc) {
1672 		kfree_sensitive(ses->auth_key.response);
1673 		ses->auth_key.response = NULL;
1674 		ses->auth_key.len = 0;
1675 	}
1676 out:
1677 	sess_data->result = rc;
1678 	sess_data->func = NULL;
1679 	SMB2_sess_free_buffer(sess_data);
1680 }
1681 #else
1682 static void
SMB2_auth_kerberos(struct SMB2_sess_data * sess_data)1683 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1684 {
1685 	cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1686 	sess_data->result = -EOPNOTSUPP;
1687 	sess_data->func = NULL;
1688 }
1689 #endif
1690 
1691 static void
1692 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);
1693 
1694 static void
SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data * sess_data)1695 SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
1696 {
1697 	int rc;
1698 	struct cifs_ses *ses = sess_data->ses;
1699 	struct TCP_Server_Info *server = sess_data->server;
1700 	struct smb2_sess_setup_rsp *rsp = NULL;
1701 	unsigned char *ntlmssp_blob = NULL;
1702 	bool use_spnego = false; /* else use raw ntlmssp */
1703 	u16 blob_length = 0;
1704 	bool is_binding = false;
1705 
1706 	/*
1707 	 * If memory allocation is successful, caller of this function
1708 	 * frees it.
1709 	 */
1710 	ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1711 	if (!ses->ntlmssp) {
1712 		rc = -ENOMEM;
1713 		goto out_err;
1714 	}
1715 	ses->ntlmssp->sesskey_per_smbsess = true;
1716 
1717 	rc = SMB2_sess_alloc_buffer(sess_data);
1718 	if (rc)
1719 		goto out_err;
1720 
1721 	rc = build_ntlmssp_smb3_negotiate_blob(&ntlmssp_blob,
1722 					  &blob_length, ses, server,
1723 					  sess_data->nls_cp);
1724 	if (rc)
1725 		goto out;
1726 
1727 	if (use_spnego) {
1728 		/* BB eventually need to add this */
1729 		cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1730 		rc = -EOPNOTSUPP;
1731 		goto out;
1732 	}
1733 	sess_data->iov[1].iov_base = ntlmssp_blob;
1734 	sess_data->iov[1].iov_len = blob_length;
1735 
1736 	rc = SMB2_sess_sendreceive(sess_data);
1737 	rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1738 
1739 	/* If true, rc here is expected and not an error */
1740 	if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1741 		rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
1742 		rc = 0;
1743 
1744 	if (rc)
1745 		goto out;
1746 
1747 	if (offsetof(struct smb2_sess_setup_rsp, Buffer) !=
1748 			le16_to_cpu(rsp->SecurityBufferOffset)) {
1749 		cifs_dbg(VFS, "Invalid security buffer offset %d\n",
1750 			le16_to_cpu(rsp->SecurityBufferOffset));
1751 		rc = -EIO;
1752 		goto out;
1753 	}
1754 	rc = decode_ntlmssp_challenge(rsp->Buffer,
1755 			le16_to_cpu(rsp->SecurityBufferLength), ses);
1756 	if (rc)
1757 		goto out;
1758 
1759 	cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1760 
1761 	spin_lock(&ses->ses_lock);
1762 	is_binding = (ses->ses_status == SES_GOOD);
1763 	spin_unlock(&ses->ses_lock);
1764 
1765 	/* keep existing ses id and flags if binding */
1766 	if (!is_binding) {
1767 		ses->Suid = le64_to_cpu(rsp->hdr.SessionId);
1768 		ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1769 	}
1770 
1771 out:
1772 	kfree_sensitive(ntlmssp_blob);
1773 	SMB2_sess_free_buffer(sess_data);
1774 	if (!rc) {
1775 		sess_data->result = 0;
1776 		sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
1777 		return;
1778 	}
1779 out_err:
1780 	kfree_sensitive(ses->ntlmssp);
1781 	ses->ntlmssp = NULL;
1782 	sess_data->result = rc;
1783 	sess_data->func = NULL;
1784 }
1785 
1786 static void
SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data * sess_data)1787 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
1788 {
1789 	int rc;
1790 	struct cifs_ses *ses = sess_data->ses;
1791 	struct TCP_Server_Info *server = sess_data->server;
1792 	struct smb2_sess_setup_req *req;
1793 	struct smb2_sess_setup_rsp *rsp = NULL;
1794 	unsigned char *ntlmssp_blob = NULL;
1795 	bool use_spnego = false; /* else use raw ntlmssp */
1796 	u16 blob_length = 0;
1797 	bool is_binding = false;
1798 
1799 	rc = SMB2_sess_alloc_buffer(sess_data);
1800 	if (rc)
1801 		goto out;
1802 
1803 	req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
1804 	req->hdr.SessionId = cpu_to_le64(ses->Suid);
1805 
1806 	rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length,
1807 				     ses, server,
1808 				     sess_data->nls_cp);
1809 	if (rc) {
1810 		cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
1811 		goto out;
1812 	}
1813 
1814 	if (use_spnego) {
1815 		/* BB eventually need to add this */
1816 		cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1817 		rc = -EOPNOTSUPP;
1818 		goto out;
1819 	}
1820 	sess_data->iov[1].iov_base = ntlmssp_blob;
1821 	sess_data->iov[1].iov_len = blob_length;
1822 
1823 	rc = SMB2_sess_sendreceive(sess_data);
1824 	if (rc)
1825 		goto out;
1826 
1827 	rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1828 
1829 	spin_lock(&ses->ses_lock);
1830 	is_binding = (ses->ses_status == SES_GOOD);
1831 	spin_unlock(&ses->ses_lock);
1832 
1833 	/* keep existing ses id and flags if binding */
1834 	if (!is_binding) {
1835 		ses->Suid = le64_to_cpu(rsp->hdr.SessionId);
1836 		ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1837 	}
1838 
1839 	rc = SMB2_sess_establish_session(sess_data);
1840 #ifdef CONFIG_CIFS_DEBUG_DUMP_KEYS
1841 	if (ses->server->dialect < SMB30_PROT_ID) {
1842 		cifs_dbg(VFS, "%s: dumping generated SMB2 session keys\n", __func__);
1843 		/*
1844 		 * The session id is opaque in terms of endianness, so we can't
1845 		 * print it as a long long. we dump it as we got it on the wire
1846 		 */
1847 		cifs_dbg(VFS, "Session Id    %*ph\n", (int)sizeof(ses->Suid),
1848 			 &ses->Suid);
1849 		cifs_dbg(VFS, "Session Key   %*ph\n",
1850 			 SMB2_NTLMV2_SESSKEY_SIZE, ses->auth_key.response);
1851 		cifs_dbg(VFS, "Signing Key   %*ph\n",
1852 			 SMB3_SIGN_KEY_SIZE, ses->auth_key.response);
1853 	}
1854 #endif
1855 out:
1856 	kfree_sensitive(ntlmssp_blob);
1857 	SMB2_sess_free_buffer(sess_data);
1858 	kfree_sensitive(ses->ntlmssp);
1859 	ses->ntlmssp = NULL;
1860 	sess_data->result = rc;
1861 	sess_data->func = NULL;
1862 }
1863 
1864 static int
SMB2_select_sec(struct SMB2_sess_data * sess_data)1865 SMB2_select_sec(struct SMB2_sess_data *sess_data)
1866 {
1867 	int type;
1868 	struct cifs_ses *ses = sess_data->ses;
1869 	struct TCP_Server_Info *server = sess_data->server;
1870 
1871 	type = smb2_select_sectype(server, ses->sectype);
1872 	cifs_dbg(FYI, "sess setup type %d\n", type);
1873 	if (type == Unspecified) {
1874 		cifs_dbg(VFS, "Unable to select appropriate authentication method!\n");
1875 		return -EINVAL;
1876 	}
1877 
1878 	switch (type) {
1879 	case Kerberos:
1880 		sess_data->func = SMB2_auth_kerberos;
1881 		break;
1882 	case RawNTLMSSP:
1883 		sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
1884 		break;
1885 	default:
1886 		cifs_dbg(VFS, "secType %d not supported!\n", type);
1887 		return -EOPNOTSUPP;
1888 	}
1889 
1890 	return 0;
1891 }
1892 
1893 int
SMB2_sess_setup(const unsigned int xid,struct cifs_ses * ses,struct TCP_Server_Info * server,const struct nls_table * nls_cp)1894 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
1895 		struct TCP_Server_Info *server,
1896 		const struct nls_table *nls_cp)
1897 {
1898 	int rc = 0;
1899 	struct SMB2_sess_data *sess_data;
1900 
1901 	cifs_dbg(FYI, "Session Setup\n");
1902 
1903 	if (!server) {
1904 		WARN(1, "%s: server is NULL!\n", __func__);
1905 		return -EIO;
1906 	}
1907 
1908 	sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
1909 	if (!sess_data)
1910 		return -ENOMEM;
1911 
1912 	sess_data->xid = xid;
1913 	sess_data->ses = ses;
1914 	sess_data->server = server;
1915 	sess_data->buf0_type = CIFS_NO_BUFFER;
1916 	sess_data->nls_cp = (struct nls_table *) nls_cp;
1917 	sess_data->previous_session = ses->Suid;
1918 
1919 	rc = SMB2_select_sec(sess_data);
1920 	if (rc)
1921 		goto out;
1922 
1923 	/*
1924 	 * Initialize the session hash with the server one.
1925 	 */
1926 	memcpy(ses->preauth_sha_hash, server->preauth_sha_hash,
1927 	       SMB2_PREAUTH_HASH_SIZE);
1928 
1929 	while (sess_data->func)
1930 		sess_data->func(sess_data);
1931 
1932 	if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign))
1933 		cifs_server_dbg(VFS, "signing requested but authenticated as guest\n");
1934 	rc = sess_data->result;
1935 out:
1936 	kfree_sensitive(sess_data);
1937 	return rc;
1938 }
1939 
1940 int
SMB2_logoff(const unsigned int xid,struct cifs_ses * ses)1941 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
1942 {
1943 	struct smb_rqst rqst;
1944 	struct smb2_logoff_req *req; /* response is also trivial struct */
1945 	int rc = 0;
1946 	struct TCP_Server_Info *server;
1947 	int flags = 0;
1948 	unsigned int total_len;
1949 	struct kvec iov[1];
1950 	struct kvec rsp_iov;
1951 	int resp_buf_type;
1952 
1953 	cifs_dbg(FYI, "disconnect session %p\n", ses);
1954 
1955 	if (ses && (ses->server))
1956 		server = ses->server;
1957 	else
1958 		return -EIO;
1959 
1960 	/* no need to send SMB logoff if uid already closed due to reconnect */
1961 	spin_lock(&ses->chan_lock);
1962 	if (CIFS_ALL_CHANS_NEED_RECONNECT(ses)) {
1963 		spin_unlock(&ses->chan_lock);
1964 		goto smb2_session_already_dead;
1965 	}
1966 	spin_unlock(&ses->chan_lock);
1967 
1968 	rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, ses->server,
1969 				 (void **) &req, &total_len);
1970 	if (rc)
1971 		return rc;
1972 
1973 	 /* since no tcon, smb2_init can not do this, so do here */
1974 	req->hdr.SessionId = cpu_to_le64(ses->Suid);
1975 
1976 	if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
1977 		flags |= CIFS_TRANSFORM_REQ;
1978 	else if (server->sign)
1979 		req->hdr.Flags |= SMB2_FLAGS_SIGNED;
1980 
1981 	flags |= CIFS_NO_RSP_BUF;
1982 
1983 	iov[0].iov_base = (char *)req;
1984 	iov[0].iov_len = total_len;
1985 
1986 	memset(&rqst, 0, sizeof(struct smb_rqst));
1987 	rqst.rq_iov = iov;
1988 	rqst.rq_nvec = 1;
1989 
1990 	rc = cifs_send_recv(xid, ses, ses->server,
1991 			    &rqst, &resp_buf_type, flags, &rsp_iov);
1992 	cifs_small_buf_release(req);
1993 	/*
1994 	 * No tcon so can't do
1995 	 * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1996 	 */
1997 
1998 smb2_session_already_dead:
1999 	return rc;
2000 }
2001 
cifs_stats_fail_inc(struct cifs_tcon * tcon,uint16_t code)2002 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
2003 {
2004 	cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
2005 }
2006 
2007 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
2008 
2009 /* These are similar values to what Windows uses */
init_copy_chunk_defaults(struct cifs_tcon * tcon)2010 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
2011 {
2012 	tcon->max_chunks = 256;
2013 	tcon->max_bytes_chunk = 1048576;
2014 	tcon->max_bytes_copy = 16777216;
2015 }
2016 
2017 int
SMB2_tcon(const unsigned int xid,struct cifs_ses * ses,const char * tree,struct cifs_tcon * tcon,const struct nls_table * cp)2018 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
2019 	  struct cifs_tcon *tcon, const struct nls_table *cp)
2020 {
2021 	struct smb_rqst rqst;
2022 	struct smb2_tree_connect_req *req;
2023 	struct smb2_tree_connect_rsp *rsp = NULL;
2024 	struct kvec iov[2];
2025 	struct kvec rsp_iov = { NULL, 0 };
2026 	int rc = 0;
2027 	int resp_buftype;
2028 	int unc_path_len;
2029 	__le16 *unc_path = NULL;
2030 	int flags = 0;
2031 	unsigned int total_len;
2032 	struct TCP_Server_Info *server = cifs_pick_channel(ses);
2033 
2034 	cifs_dbg(FYI, "TCON\n");
2035 
2036 	if (!server || !tree)
2037 		return -EIO;
2038 
2039 	unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
2040 	if (unc_path == NULL)
2041 		return -ENOMEM;
2042 
2043 	unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp);
2044 	if (unc_path_len <= 0) {
2045 		kfree(unc_path);
2046 		return -EINVAL;
2047 	}
2048 	unc_path_len *= 2;
2049 
2050 	/* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
2051 	tcon->tid = 0;
2052 	atomic_set(&tcon->num_remote_opens, 0);
2053 	rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, server,
2054 				 (void **) &req, &total_len);
2055 	if (rc) {
2056 		kfree(unc_path);
2057 		return rc;
2058 	}
2059 
2060 	if (smb3_encryption_required(tcon))
2061 		flags |= CIFS_TRANSFORM_REQ;
2062 
2063 	iov[0].iov_base = (char *)req;
2064 	/* 1 for pad */
2065 	iov[0].iov_len = total_len - 1;
2066 
2067 	/* Testing shows that buffer offset must be at location of Buffer[0] */
2068 	req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req));
2069 	req->PathLength = cpu_to_le16(unc_path_len);
2070 	iov[1].iov_base = unc_path;
2071 	iov[1].iov_len = unc_path_len;
2072 
2073 	/*
2074 	 * 3.11 tcon req must be signed if not encrypted. See MS-SMB2 3.2.4.1.1
2075 	 * unless it is guest or anonymous user. See MS-SMB2 3.2.5.3.1
2076 	 * (Samba servers don't always set the flag so also check if null user)
2077 	 */
2078 	if ((server->dialect == SMB311_PROT_ID) &&
2079 	    !smb3_encryption_required(tcon) &&
2080 	    !(ses->session_flags &
2081 		    (SMB2_SESSION_FLAG_IS_GUEST|SMB2_SESSION_FLAG_IS_NULL)) &&
2082 	    ((ses->user_name != NULL) || (ses->sectype == Kerberos)))
2083 		req->hdr.Flags |= SMB2_FLAGS_SIGNED;
2084 
2085 	memset(&rqst, 0, sizeof(struct smb_rqst));
2086 	rqst.rq_iov = iov;
2087 	rqst.rq_nvec = 2;
2088 
2089 	/* Need 64 for max size write so ask for more in case not there yet */
2090 	if (server->credits >= server->max_credits)
2091 		req->hdr.CreditRequest = cpu_to_le16(0);
2092 	else
2093 		req->hdr.CreditRequest = cpu_to_le16(
2094 			min_t(int, server->max_credits -
2095 			      server->credits, 64));
2096 
2097 	rc = cifs_send_recv(xid, ses, server,
2098 			    &rqst, &resp_buftype, flags, &rsp_iov);
2099 	cifs_small_buf_release(req);
2100 	rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
2101 	trace_smb3_tcon(xid, tcon->tid, ses->Suid, tree, rc);
2102 	if ((rc != 0) || (rsp == NULL)) {
2103 		cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
2104 		tcon->need_reconnect = true;
2105 		goto tcon_error_exit;
2106 	}
2107 
2108 	switch (rsp->ShareType) {
2109 	case SMB2_SHARE_TYPE_DISK:
2110 		cifs_dbg(FYI, "connection to disk share\n");
2111 		break;
2112 	case SMB2_SHARE_TYPE_PIPE:
2113 		tcon->pipe = true;
2114 		cifs_dbg(FYI, "connection to pipe share\n");
2115 		break;
2116 	case SMB2_SHARE_TYPE_PRINT:
2117 		tcon->print = true;
2118 		cifs_dbg(FYI, "connection to printer\n");
2119 		break;
2120 	default:
2121 		cifs_server_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
2122 		rc = -EOPNOTSUPP;
2123 		goto tcon_error_exit;
2124 	}
2125 
2126 	tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
2127 	tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
2128 	tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
2129 	tcon->tid = le32_to_cpu(rsp->hdr.Id.SyncId.TreeId);
2130 	strscpy(tcon->tree_name, tree, sizeof(tcon->tree_name));
2131 
2132 	if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
2133 	    ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
2134 		cifs_tcon_dbg(VFS, "DFS capability contradicts DFS flag\n");
2135 
2136 	if (tcon->seal &&
2137 	    !(server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
2138 		cifs_tcon_dbg(VFS, "Encryption is requested but not supported\n");
2139 
2140 	init_copy_chunk_defaults(tcon);
2141 	if (server->ops->validate_negotiate)
2142 		rc = server->ops->validate_negotiate(xid, tcon);
2143 	if (rc == 0) /* See MS-SMB2 2.2.10 and 3.2.5.5 */
2144 		if (tcon->share_flags & SMB2_SHAREFLAG_ISOLATED_TRANSPORT)
2145 			server->nosharesock = true;
2146 tcon_exit:
2147 
2148 	free_rsp_buf(resp_buftype, rsp);
2149 	kfree(unc_path);
2150 	return rc;
2151 
2152 tcon_error_exit:
2153 	if (rsp && rsp->hdr.Status == STATUS_BAD_NETWORK_NAME)
2154 		cifs_dbg(VFS | ONCE, "BAD_NETWORK_NAME: %s\n", tree);
2155 	goto tcon_exit;
2156 }
2157 
2158 int
SMB2_tdis(const unsigned int xid,struct cifs_tcon * tcon)2159 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
2160 {
2161 	struct smb_rqst rqst;
2162 	struct smb2_tree_disconnect_req *req; /* response is trivial */
2163 	int rc = 0;
2164 	struct cifs_ses *ses = tcon->ses;
2165 	struct TCP_Server_Info *server = cifs_pick_channel(ses);
2166 	int flags = 0;
2167 	unsigned int total_len;
2168 	struct kvec iov[1];
2169 	struct kvec rsp_iov;
2170 	int resp_buf_type;
2171 
2172 	cifs_dbg(FYI, "Tree Disconnect\n");
2173 
2174 	if (!ses || !(ses->server))
2175 		return -EIO;
2176 
2177 	trace_smb3_tdis_enter(xid, tcon->tid, ses->Suid, tcon->tree_name);
2178 	spin_lock(&ses->chan_lock);
2179 	if ((tcon->need_reconnect) ||
2180 	    (CIFS_ALL_CHANS_NEED_RECONNECT(tcon->ses))) {
2181 		spin_unlock(&ses->chan_lock);
2182 		return 0;
2183 	}
2184 	spin_unlock(&ses->chan_lock);
2185 
2186 	invalidate_all_cached_dirs(tcon);
2187 
2188 	rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, server,
2189 				 (void **) &req,
2190 				 &total_len);
2191 	if (rc)
2192 		return rc;
2193 
2194 	if (smb3_encryption_required(tcon))
2195 		flags |= CIFS_TRANSFORM_REQ;
2196 
2197 	flags |= CIFS_NO_RSP_BUF;
2198 
2199 	iov[0].iov_base = (char *)req;
2200 	iov[0].iov_len = total_len;
2201 
2202 	memset(&rqst, 0, sizeof(struct smb_rqst));
2203 	rqst.rq_iov = iov;
2204 	rqst.rq_nvec = 1;
2205 
2206 	rc = cifs_send_recv(xid, ses, server,
2207 			    &rqst, &resp_buf_type, flags, &rsp_iov);
2208 	cifs_small_buf_release(req);
2209 	if (rc) {
2210 		cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
2211 		trace_smb3_tdis_err(xid, tcon->tid, ses->Suid, rc);
2212 	}
2213 	trace_smb3_tdis_done(xid, tcon->tid, ses->Suid);
2214 
2215 	return rc;
2216 }
2217 
2218 
2219 static struct create_durable *
create_durable_buf(void)2220 create_durable_buf(void)
2221 {
2222 	struct create_durable *buf;
2223 
2224 	buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
2225 	if (!buf)
2226 		return NULL;
2227 
2228 	buf->ccontext.DataOffset = cpu_to_le16(offsetof
2229 					(struct create_durable, Data));
2230 	buf->ccontext.DataLength = cpu_to_le32(16);
2231 	buf->ccontext.NameOffset = cpu_to_le16(offsetof
2232 				(struct create_durable, Name));
2233 	buf->ccontext.NameLength = cpu_to_le16(4);
2234 	/* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
2235 	buf->Name[0] = 'D';
2236 	buf->Name[1] = 'H';
2237 	buf->Name[2] = 'n';
2238 	buf->Name[3] = 'Q';
2239 	return buf;
2240 }
2241 
2242 static struct create_durable *
create_reconnect_durable_buf(struct cifs_fid * fid)2243 create_reconnect_durable_buf(struct cifs_fid *fid)
2244 {
2245 	struct create_durable *buf;
2246 
2247 	buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
2248 	if (!buf)
2249 		return NULL;
2250 
2251 	buf->ccontext.DataOffset = cpu_to_le16(offsetof
2252 					(struct create_durable, Data));
2253 	buf->ccontext.DataLength = cpu_to_le32(16);
2254 	buf->ccontext.NameOffset = cpu_to_le16(offsetof
2255 				(struct create_durable, Name));
2256 	buf->ccontext.NameLength = cpu_to_le16(4);
2257 	buf->Data.Fid.PersistentFileId = fid->persistent_fid;
2258 	buf->Data.Fid.VolatileFileId = fid->volatile_fid;
2259 	/* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
2260 	buf->Name[0] = 'D';
2261 	buf->Name[1] = 'H';
2262 	buf->Name[2] = 'n';
2263 	buf->Name[3] = 'C';
2264 	return buf;
2265 }
2266 
2267 static void
parse_query_id_ctxt(struct create_context * cc,struct smb2_file_all_info * buf)2268 parse_query_id_ctxt(struct create_context *cc, struct smb2_file_all_info *buf)
2269 {
2270 	struct create_disk_id_rsp *pdisk_id = (struct create_disk_id_rsp *)cc;
2271 
2272 	cifs_dbg(FYI, "parse query id context 0x%llx 0x%llx\n",
2273 		pdisk_id->DiskFileId, pdisk_id->VolumeId);
2274 	buf->IndexNumber = pdisk_id->DiskFileId;
2275 }
2276 
2277 static void
parse_posix_ctxt(struct create_context * cc,struct smb2_file_all_info * info,struct create_posix_rsp * posix)2278 parse_posix_ctxt(struct create_context *cc, struct smb2_file_all_info *info,
2279 		 struct create_posix_rsp *posix)
2280 {
2281 	int sid_len;
2282 	u8 *beg = (u8 *)cc + le16_to_cpu(cc->DataOffset);
2283 	u8 *end = beg + le32_to_cpu(cc->DataLength);
2284 	u8 *sid;
2285 
2286 	memset(posix, 0, sizeof(*posix));
2287 
2288 	posix->nlink = le32_to_cpu(*(__le32 *)(beg + 0));
2289 	posix->reparse_tag = le32_to_cpu(*(__le32 *)(beg + 4));
2290 	posix->mode = le32_to_cpu(*(__le32 *)(beg + 8));
2291 
2292 	sid = beg + 12;
2293 	sid_len = posix_info_sid_size(sid, end);
2294 	if (sid_len < 0) {
2295 		cifs_dbg(VFS, "bad owner sid in posix create response\n");
2296 		return;
2297 	}
2298 	memcpy(&posix->owner, sid, sid_len);
2299 
2300 	sid = sid + sid_len;
2301 	sid_len = posix_info_sid_size(sid, end);
2302 	if (sid_len < 0) {
2303 		cifs_dbg(VFS, "bad group sid in posix create response\n");
2304 		return;
2305 	}
2306 	memcpy(&posix->group, sid, sid_len);
2307 
2308 	cifs_dbg(FYI, "nlink=%d mode=%o reparse_tag=%x\n",
2309 		 posix->nlink, posix->mode, posix->reparse_tag);
2310 }
2311 
smb2_parse_contexts(struct TCP_Server_Info * server,struct kvec * rsp_iov,__u16 * epoch,char * lease_key,__u8 * oplock,struct smb2_file_all_info * buf,struct create_posix_rsp * posix)2312 int smb2_parse_contexts(struct TCP_Server_Info *server,
2313 			struct kvec *rsp_iov,
2314 			__u16 *epoch,
2315 			char *lease_key, __u8 *oplock,
2316 			struct smb2_file_all_info *buf,
2317 			struct create_posix_rsp *posix)
2318 {
2319 	struct smb2_create_rsp *rsp = rsp_iov->iov_base;
2320 	struct create_context *cc;
2321 	size_t rem, off, len;
2322 	size_t doff, dlen;
2323 	size_t noff, nlen;
2324 	char *name;
2325 	static const char smb3_create_tag_posix[] = {
2326 		0x93, 0xAD, 0x25, 0x50, 0x9C,
2327 		0xB4, 0x11, 0xE7, 0xB4, 0x23, 0x83,
2328 		0xDE, 0x96, 0x8B, 0xCD, 0x7C
2329 	};
2330 
2331 	*oplock = 0;
2332 
2333 	off = le32_to_cpu(rsp->CreateContextsOffset);
2334 	rem = le32_to_cpu(rsp->CreateContextsLength);
2335 	if (check_add_overflow(off, rem, &len) || len > rsp_iov->iov_len)
2336 		return -EINVAL;
2337 	cc = (struct create_context *)((u8 *)rsp + off);
2338 
2339 	/* Initialize inode number to 0 in case no valid data in qfid context */
2340 	if (buf)
2341 		buf->IndexNumber = 0;
2342 
2343 	while (rem >= sizeof(*cc)) {
2344 		doff = le16_to_cpu(cc->DataOffset);
2345 		dlen = le32_to_cpu(cc->DataLength);
2346 		if (check_add_overflow(doff, dlen, &len) || len > rem)
2347 			return -EINVAL;
2348 
2349 		noff = le16_to_cpu(cc->NameOffset);
2350 		nlen = le16_to_cpu(cc->NameLength);
2351 		if (noff + nlen > doff)
2352 			return -EINVAL;
2353 
2354 		name = (char *)cc + noff;
2355 		switch (nlen) {
2356 		case 4:
2357 			if (!strncmp(name, SMB2_CREATE_REQUEST_LEASE, 4)) {
2358 				*oplock = server->ops->parse_lease_buf(cc, epoch,
2359 								       lease_key);
2360 			} else if (buf &&
2361 				   !strncmp(name, SMB2_CREATE_QUERY_ON_DISK_ID, 4)) {
2362 				parse_query_id_ctxt(cc, buf);
2363 			}
2364 			break;
2365 		case 16:
2366 			if (posix && !memcmp(name, smb3_create_tag_posix, 16))
2367 				parse_posix_ctxt(cc, buf, posix);
2368 			break;
2369 		default:
2370 			cifs_dbg(FYI, "%s: unhandled context (nlen=%zu dlen=%zu)\n",
2371 				 __func__, nlen, dlen);
2372 			if (IS_ENABLED(CONFIG_CIFS_DEBUG2))
2373 				cifs_dump_mem("context data: ", cc, dlen);
2374 			break;
2375 		}
2376 
2377 		off = le32_to_cpu(cc->Next);
2378 		if (!off)
2379 			break;
2380 		if (check_sub_overflow(rem, off, &rem))
2381 			return -EINVAL;
2382 		cc = (struct create_context *)((u8 *)cc + off);
2383 	}
2384 
2385 	if (rsp->OplockLevel != SMB2_OPLOCK_LEVEL_LEASE)
2386 		*oplock = rsp->OplockLevel;
2387 
2388 	return 0;
2389 }
2390 
2391 static int
add_lease_context(struct TCP_Server_Info * server,struct smb2_create_req * req,struct kvec * iov,unsigned int * num_iovec,u8 * lease_key,__u8 * oplock)2392 add_lease_context(struct TCP_Server_Info *server,
2393 		  struct smb2_create_req *req,
2394 		  struct kvec *iov,
2395 		  unsigned int *num_iovec, u8 *lease_key, __u8 *oplock)
2396 {
2397 	unsigned int num = *num_iovec;
2398 
2399 	iov[num].iov_base = server->ops->create_lease_buf(lease_key, *oplock);
2400 	if (iov[num].iov_base == NULL)
2401 		return -ENOMEM;
2402 	iov[num].iov_len = server->vals->create_lease_size;
2403 	req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
2404 	*num_iovec = num + 1;
2405 	return 0;
2406 }
2407 
2408 static struct create_durable_v2 *
create_durable_v2_buf(struct cifs_open_parms * oparms)2409 create_durable_v2_buf(struct cifs_open_parms *oparms)
2410 {
2411 	struct cifs_fid *pfid = oparms->fid;
2412 	struct create_durable_v2 *buf;
2413 
2414 	buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
2415 	if (!buf)
2416 		return NULL;
2417 
2418 	buf->ccontext.DataOffset = cpu_to_le16(offsetof
2419 					(struct create_durable_v2, dcontext));
2420 	buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
2421 	buf->ccontext.NameOffset = cpu_to_le16(offsetof
2422 				(struct create_durable_v2, Name));
2423 	buf->ccontext.NameLength = cpu_to_le16(4);
2424 
2425 	/*
2426 	 * NB: Handle timeout defaults to 0, which allows server to choose
2427 	 * (most servers default to 120 seconds) and most clients default to 0.
2428 	 * This can be overridden at mount ("handletimeout=") if the user wants
2429 	 * a different persistent (or resilient) handle timeout for all opens
2430 	 * on a particular SMB3 mount.
2431 	 */
2432 	buf->dcontext.Timeout = cpu_to_le32(oparms->tcon->handle_timeout);
2433 	buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
2434 
2435 	/* for replay, we should not overwrite the existing create guid */
2436 	if (!oparms->replay) {
2437 		generate_random_uuid(buf->dcontext.CreateGuid);
2438 		memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
2439 	} else
2440 		memcpy(buf->dcontext.CreateGuid, pfid->create_guid, 16);
2441 
2442 	/* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
2443 	buf->Name[0] = 'D';
2444 	buf->Name[1] = 'H';
2445 	buf->Name[2] = '2';
2446 	buf->Name[3] = 'Q';
2447 	return buf;
2448 }
2449 
2450 static struct create_durable_handle_reconnect_v2 *
create_reconnect_durable_v2_buf(struct cifs_fid * fid)2451 create_reconnect_durable_v2_buf(struct cifs_fid *fid)
2452 {
2453 	struct create_durable_handle_reconnect_v2 *buf;
2454 
2455 	buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
2456 			GFP_KERNEL);
2457 	if (!buf)
2458 		return NULL;
2459 
2460 	buf->ccontext.DataOffset =
2461 		cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2462 				     dcontext));
2463 	buf->ccontext.DataLength =
2464 		cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
2465 	buf->ccontext.NameOffset =
2466 		cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2467 			    Name));
2468 	buf->ccontext.NameLength = cpu_to_le16(4);
2469 
2470 	buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
2471 	buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
2472 	buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
2473 	memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
2474 
2475 	/* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
2476 	buf->Name[0] = 'D';
2477 	buf->Name[1] = 'H';
2478 	buf->Name[2] = '2';
2479 	buf->Name[3] = 'C';
2480 	return buf;
2481 }
2482 
2483 static int
add_durable_v2_context(struct kvec * iov,unsigned int * num_iovec,struct cifs_open_parms * oparms)2484 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
2485 		    struct cifs_open_parms *oparms)
2486 {
2487 	unsigned int num = *num_iovec;
2488 
2489 	iov[num].iov_base = create_durable_v2_buf(oparms);
2490 	if (iov[num].iov_base == NULL)
2491 		return -ENOMEM;
2492 	iov[num].iov_len = sizeof(struct create_durable_v2);
2493 	*num_iovec = num + 1;
2494 	return 0;
2495 }
2496 
2497 static int
add_durable_reconnect_v2_context(struct kvec * iov,unsigned int * num_iovec,struct cifs_open_parms * oparms)2498 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
2499 		    struct cifs_open_parms *oparms)
2500 {
2501 	unsigned int num = *num_iovec;
2502 
2503 	/* indicate that we don't need to relock the file */
2504 	oparms->reconnect = false;
2505 
2506 	iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
2507 	if (iov[num].iov_base == NULL)
2508 		return -ENOMEM;
2509 	iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
2510 	*num_iovec = num + 1;
2511 	return 0;
2512 }
2513 
2514 static int
add_durable_context(struct kvec * iov,unsigned int * num_iovec,struct cifs_open_parms * oparms,bool use_persistent)2515 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
2516 		    struct cifs_open_parms *oparms, bool use_persistent)
2517 {
2518 	unsigned int num = *num_iovec;
2519 
2520 	if (use_persistent) {
2521 		if (oparms->reconnect)
2522 			return add_durable_reconnect_v2_context(iov, num_iovec,
2523 								oparms);
2524 		else
2525 			return add_durable_v2_context(iov, num_iovec, oparms);
2526 	}
2527 
2528 	if (oparms->reconnect) {
2529 		iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
2530 		/* indicate that we don't need to relock the file */
2531 		oparms->reconnect = false;
2532 	} else
2533 		iov[num].iov_base = create_durable_buf();
2534 	if (iov[num].iov_base == NULL)
2535 		return -ENOMEM;
2536 	iov[num].iov_len = sizeof(struct create_durable);
2537 	*num_iovec = num + 1;
2538 	return 0;
2539 }
2540 
2541 /* See MS-SMB2 2.2.13.2.7 */
2542 static struct crt_twarp_ctxt *
create_twarp_buf(__u64 timewarp)2543 create_twarp_buf(__u64 timewarp)
2544 {
2545 	struct crt_twarp_ctxt *buf;
2546 
2547 	buf = kzalloc(sizeof(struct crt_twarp_ctxt), GFP_KERNEL);
2548 	if (!buf)
2549 		return NULL;
2550 
2551 	buf->ccontext.DataOffset = cpu_to_le16(offsetof
2552 					(struct crt_twarp_ctxt, Timestamp));
2553 	buf->ccontext.DataLength = cpu_to_le32(8);
2554 	buf->ccontext.NameOffset = cpu_to_le16(offsetof
2555 				(struct crt_twarp_ctxt, Name));
2556 	buf->ccontext.NameLength = cpu_to_le16(4);
2557 	/* SMB2_CREATE_TIMEWARP_TOKEN is "TWrp" */
2558 	buf->Name[0] = 'T';
2559 	buf->Name[1] = 'W';
2560 	buf->Name[2] = 'r';
2561 	buf->Name[3] = 'p';
2562 	buf->Timestamp = cpu_to_le64(timewarp);
2563 	return buf;
2564 }
2565 
2566 /* See MS-SMB2 2.2.13.2.7 */
2567 static int
add_twarp_context(struct kvec * iov,unsigned int * num_iovec,__u64 timewarp)2568 add_twarp_context(struct kvec *iov, unsigned int *num_iovec, __u64 timewarp)
2569 {
2570 	unsigned int num = *num_iovec;
2571 
2572 	iov[num].iov_base = create_twarp_buf(timewarp);
2573 	if (iov[num].iov_base == NULL)
2574 		return -ENOMEM;
2575 	iov[num].iov_len = sizeof(struct crt_twarp_ctxt);
2576 	*num_iovec = num + 1;
2577 	return 0;
2578 }
2579 
2580 /* See http://technet.microsoft.com/en-us/library/hh509017(v=ws.10).aspx */
setup_owner_group_sids(char * buf)2581 static void setup_owner_group_sids(char *buf)
2582 {
2583 	struct owner_group_sids *sids = (struct owner_group_sids *)buf;
2584 
2585 	/* Populate the user ownership fields S-1-5-88-1 */
2586 	sids->owner.Revision = 1;
2587 	sids->owner.NumAuth = 3;
2588 	sids->owner.Authority[5] = 5;
2589 	sids->owner.SubAuthorities[0] = cpu_to_le32(88);
2590 	sids->owner.SubAuthorities[1] = cpu_to_le32(1);
2591 	sids->owner.SubAuthorities[2] = cpu_to_le32(current_fsuid().val);
2592 
2593 	/* Populate the group ownership fields S-1-5-88-2 */
2594 	sids->group.Revision = 1;
2595 	sids->group.NumAuth = 3;
2596 	sids->group.Authority[5] = 5;
2597 	sids->group.SubAuthorities[0] = cpu_to_le32(88);
2598 	sids->group.SubAuthorities[1] = cpu_to_le32(2);
2599 	sids->group.SubAuthorities[2] = cpu_to_le32(current_fsgid().val);
2600 
2601 	cifs_dbg(FYI, "owner S-1-5-88-1-%d, group S-1-5-88-2-%d\n", current_fsuid().val, current_fsgid().val);
2602 }
2603 
2604 /* See MS-SMB2 2.2.13.2.2 and MS-DTYP 2.4.6 */
2605 static struct crt_sd_ctxt *
create_sd_buf(umode_t mode,bool set_owner,unsigned int * len)2606 create_sd_buf(umode_t mode, bool set_owner, unsigned int *len)
2607 {
2608 	struct crt_sd_ctxt *buf;
2609 	__u8 *ptr, *aclptr;
2610 	unsigned int acelen, acl_size, ace_count;
2611 	unsigned int owner_offset = 0;
2612 	unsigned int group_offset = 0;
2613 	struct smb3_acl acl = {};
2614 
2615 	*len = round_up(sizeof(struct crt_sd_ctxt) + (sizeof(struct smb_ace) * 4), 8);
2616 
2617 	if (set_owner) {
2618 		/* sizeof(struct owner_group_sids) is already multiple of 8 so no need to round */
2619 		*len += sizeof(struct owner_group_sids);
2620 	}
2621 
2622 	buf = kzalloc(*len, GFP_KERNEL);
2623 	if (buf == NULL)
2624 		return buf;
2625 
2626 	ptr = (__u8 *)&buf[1];
2627 	if (set_owner) {
2628 		/* offset fields are from beginning of security descriptor not of create context */
2629 		owner_offset = ptr - (__u8 *)&buf->sd;
2630 		buf->sd.OffsetOwner = cpu_to_le32(owner_offset);
2631 		group_offset = owner_offset + offsetof(struct owner_group_sids, group);
2632 		buf->sd.OffsetGroup = cpu_to_le32(group_offset);
2633 
2634 		setup_owner_group_sids(ptr);
2635 		ptr += sizeof(struct owner_group_sids);
2636 	} else {
2637 		buf->sd.OffsetOwner = 0;
2638 		buf->sd.OffsetGroup = 0;
2639 	}
2640 
2641 	buf->ccontext.DataOffset = cpu_to_le16(offsetof(struct crt_sd_ctxt, sd));
2642 	buf->ccontext.NameOffset = cpu_to_le16(offsetof(struct crt_sd_ctxt, Name));
2643 	buf->ccontext.NameLength = cpu_to_le16(4);
2644 	/* SMB2_CREATE_SD_BUFFER_TOKEN is "SecD" */
2645 	buf->Name[0] = 'S';
2646 	buf->Name[1] = 'e';
2647 	buf->Name[2] = 'c';
2648 	buf->Name[3] = 'D';
2649 	buf->sd.Revision = 1;  /* Must be one see MS-DTYP 2.4.6 */
2650 
2651 	/*
2652 	 * ACL is "self relative" ie ACL is stored in contiguous block of memory
2653 	 * and "DP" ie the DACL is present
2654 	 */
2655 	buf->sd.Control = cpu_to_le16(ACL_CONTROL_SR | ACL_CONTROL_DP);
2656 
2657 	/* offset owner, group and Sbz1 and SACL are all zero */
2658 	buf->sd.OffsetDacl = cpu_to_le32(ptr - (__u8 *)&buf->sd);
2659 	/* Ship the ACL for now. we will copy it into buf later. */
2660 	aclptr = ptr;
2661 	ptr += sizeof(struct smb3_acl);
2662 
2663 	/* create one ACE to hold the mode embedded in reserved special SID */
2664 	acelen = setup_special_mode_ACE((struct smb_ace *)ptr, false, (__u64)mode);
2665 	ptr += acelen;
2666 	acl_size = acelen + sizeof(struct smb3_acl);
2667 	ace_count = 1;
2668 
2669 	if (set_owner) {
2670 		/* we do not need to reallocate buffer to add the two more ACEs. plenty of space */
2671 		acelen = setup_special_user_owner_ACE((struct smb_ace *)ptr);
2672 		ptr += acelen;
2673 		acl_size += acelen;
2674 		ace_count += 1;
2675 	}
2676 
2677 	/* and one more ACE to allow access for authenticated users */
2678 	acelen = setup_authusers_ACE((struct smb_ace *)ptr);
2679 	ptr += acelen;
2680 	acl_size += acelen;
2681 	ace_count += 1;
2682 
2683 	acl.AclRevision = ACL_REVISION; /* See 2.4.4.1 of MS-DTYP */
2684 	acl.AclSize = cpu_to_le16(acl_size);
2685 	acl.AceCount = cpu_to_le16(ace_count);
2686 	/* acl.Sbz1 and Sbz2 MBZ so are not set here, but initialized above */
2687 	memcpy(aclptr, &acl, sizeof(struct smb3_acl));
2688 
2689 	buf->ccontext.DataLength = cpu_to_le32(ptr - (__u8 *)&buf->sd);
2690 	*len = round_up((unsigned int)(ptr - (__u8 *)buf), 8);
2691 
2692 	return buf;
2693 }
2694 
2695 static int
add_sd_context(struct kvec * iov,unsigned int * num_iovec,umode_t mode,bool set_owner)2696 add_sd_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode, bool set_owner)
2697 {
2698 	unsigned int num = *num_iovec;
2699 	unsigned int len = 0;
2700 
2701 	iov[num].iov_base = create_sd_buf(mode, set_owner, &len);
2702 	if (iov[num].iov_base == NULL)
2703 		return -ENOMEM;
2704 	iov[num].iov_len = len;
2705 	*num_iovec = num + 1;
2706 	return 0;
2707 }
2708 
2709 static struct crt_query_id_ctxt *
create_query_id_buf(void)2710 create_query_id_buf(void)
2711 {
2712 	struct crt_query_id_ctxt *buf;
2713 
2714 	buf = kzalloc(sizeof(struct crt_query_id_ctxt), GFP_KERNEL);
2715 	if (!buf)
2716 		return NULL;
2717 
2718 	buf->ccontext.DataOffset = cpu_to_le16(0);
2719 	buf->ccontext.DataLength = cpu_to_le32(0);
2720 	buf->ccontext.NameOffset = cpu_to_le16(offsetof
2721 				(struct crt_query_id_ctxt, Name));
2722 	buf->ccontext.NameLength = cpu_to_le16(4);
2723 	/* SMB2_CREATE_QUERY_ON_DISK_ID is "QFid" */
2724 	buf->Name[0] = 'Q';
2725 	buf->Name[1] = 'F';
2726 	buf->Name[2] = 'i';
2727 	buf->Name[3] = 'd';
2728 	return buf;
2729 }
2730 
2731 /* See MS-SMB2 2.2.13.2.9 */
2732 static int
add_query_id_context(struct kvec * iov,unsigned int * num_iovec)2733 add_query_id_context(struct kvec *iov, unsigned int *num_iovec)
2734 {
2735 	unsigned int num = *num_iovec;
2736 
2737 	iov[num].iov_base = create_query_id_buf();
2738 	if (iov[num].iov_base == NULL)
2739 		return -ENOMEM;
2740 	iov[num].iov_len = sizeof(struct crt_query_id_ctxt);
2741 	*num_iovec = num + 1;
2742 	return 0;
2743 }
2744 
add_ea_context(struct cifs_open_parms * oparms,struct kvec * rq_iov,unsigned int * num_iovs)2745 static void add_ea_context(struct cifs_open_parms *oparms,
2746 			   struct kvec *rq_iov, unsigned int *num_iovs)
2747 {
2748 	struct kvec *iov = oparms->ea_cctx;
2749 
2750 	if (iov && iov->iov_base && iov->iov_len) {
2751 		rq_iov[(*num_iovs)++] = *iov;
2752 		memset(iov, 0, sizeof(*iov));
2753 	}
2754 }
2755 
2756 static int
alloc_path_with_tree_prefix(__le16 ** out_path,int * out_size,int * out_len,const char * treename,const __le16 * path)2757 alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
2758 			    const char *treename, const __le16 *path)
2759 {
2760 	int treename_len, path_len;
2761 	struct nls_table *cp;
2762 	const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
2763 
2764 	/*
2765 	 * skip leading "\\"
2766 	 */
2767 	treename_len = strlen(treename);
2768 	if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
2769 		return -EINVAL;
2770 
2771 	treename += 2;
2772 	treename_len -= 2;
2773 
2774 	path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
2775 
2776 	/* make room for one path separator only if @path isn't empty */
2777 	*out_len = treename_len + (path[0] ? 1 : 0) + path_len;
2778 
2779 	/*
2780 	 * final path needs to be 8-byte aligned as specified in
2781 	 * MS-SMB2 2.2.13 SMB2 CREATE Request.
2782 	 */
2783 	*out_size = round_up(*out_len * sizeof(__le16), 8);
2784 	*out_path = kzalloc(*out_size + sizeof(__le16) /* null */, GFP_KERNEL);
2785 	if (!*out_path)
2786 		return -ENOMEM;
2787 
2788 	cp = load_nls_default();
2789 	cifs_strtoUTF16(*out_path, treename, treename_len, cp);
2790 
2791 	/* Do not append the separator if the path is empty */
2792 	if (path[0] != cpu_to_le16(0x0000)) {
2793 		UniStrcat((wchar_t *)*out_path, (wchar_t *)sep);
2794 		UniStrcat((wchar_t *)*out_path, (wchar_t *)path);
2795 	}
2796 
2797 	unload_nls(cp);
2798 
2799 	return 0;
2800 }
2801 
smb311_posix_mkdir(const unsigned int xid,struct inode * inode,umode_t mode,struct cifs_tcon * tcon,const char * full_path,struct cifs_sb_info * cifs_sb)2802 int smb311_posix_mkdir(const unsigned int xid, struct inode *inode,
2803 			       umode_t mode, struct cifs_tcon *tcon,
2804 			       const char *full_path,
2805 			       struct cifs_sb_info *cifs_sb)
2806 {
2807 	struct smb_rqst rqst;
2808 	struct smb2_create_req *req;
2809 	struct smb2_create_rsp *rsp = NULL;
2810 	struct cifs_ses *ses = tcon->ses;
2811 	struct kvec iov[3]; /* make sure at least one for each open context */
2812 	struct kvec rsp_iov = {NULL, 0};
2813 	int resp_buftype;
2814 	int uni_path_len;
2815 	__le16 *copy_path = NULL;
2816 	int copy_size;
2817 	int rc = 0;
2818 	unsigned int n_iov = 2;
2819 	__u32 file_attributes = 0;
2820 	char *pc_buf = NULL;
2821 	int flags = 0;
2822 	unsigned int total_len;
2823 	__le16 *utf16_path = NULL;
2824 	struct TCP_Server_Info *server;
2825 	int retries = 0, cur_sleep = 1;
2826 
2827 replay_again:
2828 	/* reinitialize for possible replay */
2829 	flags = 0;
2830 	n_iov = 2;
2831 	server = cifs_pick_channel(ses);
2832 
2833 	cifs_dbg(FYI, "mkdir\n");
2834 
2835 	/* resource #1: path allocation */
2836 	utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
2837 	if (!utf16_path)
2838 		return -ENOMEM;
2839 
2840 	if (!ses || !server) {
2841 		rc = -EIO;
2842 		goto err_free_path;
2843 	}
2844 
2845 	/* resource #2: request */
2846 	rc = smb2_plain_req_init(SMB2_CREATE, tcon, server,
2847 				 (void **) &req, &total_len);
2848 	if (rc)
2849 		goto err_free_path;
2850 
2851 
2852 	if (smb3_encryption_required(tcon))
2853 		flags |= CIFS_TRANSFORM_REQ;
2854 
2855 	req->ImpersonationLevel = IL_IMPERSONATION;
2856 	req->DesiredAccess = cpu_to_le32(FILE_WRITE_ATTRIBUTES);
2857 	/* File attributes ignored on open (used in create though) */
2858 	req->FileAttributes = cpu_to_le32(file_attributes);
2859 	req->ShareAccess = FILE_SHARE_ALL_LE;
2860 	req->CreateDisposition = cpu_to_le32(FILE_CREATE);
2861 	req->CreateOptions = cpu_to_le32(CREATE_NOT_FILE);
2862 
2863 	iov[0].iov_base = (char *)req;
2864 	/* -1 since last byte is buf[0] which is sent below (path) */
2865 	iov[0].iov_len = total_len - 1;
2866 
2867 	req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2868 
2869 	/* [MS-SMB2] 2.2.13 NameOffset:
2870 	 * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2871 	 * the SMB2 header, the file name includes a prefix that will
2872 	 * be processed during DFS name normalization as specified in
2873 	 * section 3.3.5.9. Otherwise, the file name is relative to
2874 	 * the share that is identified by the TreeId in the SMB2
2875 	 * header.
2876 	 */
2877 	if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2878 		int name_len;
2879 
2880 		req->hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2881 		rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2882 						 &name_len,
2883 						 tcon->tree_name, utf16_path);
2884 		if (rc)
2885 			goto err_free_req;
2886 
2887 		req->NameLength = cpu_to_le16(name_len * 2);
2888 		uni_path_len = copy_size;
2889 		/* free before overwriting resource */
2890 		kfree(utf16_path);
2891 		utf16_path = copy_path;
2892 	} else {
2893 		uni_path_len = (2 * UniStrnlen((wchar_t *)utf16_path, PATH_MAX)) + 2;
2894 		/* MUST set path len (NameLength) to 0 opening root of share */
2895 		req->NameLength = cpu_to_le16(uni_path_len - 2);
2896 		if (uni_path_len % 8 != 0) {
2897 			copy_size = roundup(uni_path_len, 8);
2898 			copy_path = kzalloc(copy_size, GFP_KERNEL);
2899 			if (!copy_path) {
2900 				rc = -ENOMEM;
2901 				goto err_free_req;
2902 			}
2903 			memcpy((char *)copy_path, (const char *)utf16_path,
2904 			       uni_path_len);
2905 			uni_path_len = copy_size;
2906 			/* free before overwriting resource */
2907 			kfree(utf16_path);
2908 			utf16_path = copy_path;
2909 		}
2910 	}
2911 
2912 	iov[1].iov_len = uni_path_len;
2913 	iov[1].iov_base = utf16_path;
2914 	req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;
2915 
2916 	if (tcon->posix_extensions) {
2917 		/* resource #3: posix buf */
2918 		rc = add_posix_context(iov, &n_iov, mode);
2919 		if (rc)
2920 			goto err_free_req;
2921 		req->CreateContextsOffset = cpu_to_le32(
2922 			sizeof(struct smb2_create_req) +
2923 			iov[1].iov_len);
2924 		le32_add_cpu(&req->CreateContextsLength, iov[n_iov-1].iov_len);
2925 		pc_buf = iov[n_iov-1].iov_base;
2926 	}
2927 
2928 
2929 	memset(&rqst, 0, sizeof(struct smb_rqst));
2930 	rqst.rq_iov = iov;
2931 	rqst.rq_nvec = n_iov;
2932 
2933 	/* no need to inc num_remote_opens because we close it just below */
2934 	trace_smb3_posix_mkdir_enter(xid, tcon->tid, ses->Suid, full_path, CREATE_NOT_FILE,
2935 				    FILE_WRITE_ATTRIBUTES);
2936 
2937 	if (retries)
2938 		smb2_set_replay(server, &rqst);
2939 
2940 	/* resource #4: response buffer */
2941 	rc = cifs_send_recv(xid, ses, server,
2942 			    &rqst, &resp_buftype, flags, &rsp_iov);
2943 	if (rc) {
2944 		cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2945 		trace_smb3_posix_mkdir_err(xid, tcon->tid, ses->Suid,
2946 					   CREATE_NOT_FILE,
2947 					   FILE_WRITE_ATTRIBUTES, rc);
2948 		goto err_free_rsp_buf;
2949 	}
2950 
2951 	/*
2952 	 * Although unlikely to be possible for rsp to be null and rc not set,
2953 	 * adding check below is slightly safer long term (and quiets Coverity
2954 	 * warning)
2955 	 */
2956 	rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2957 	if (rsp == NULL) {
2958 		rc = -EIO;
2959 		kfree(pc_buf);
2960 		goto err_free_req;
2961 	}
2962 
2963 	trace_smb3_posix_mkdir_done(xid, rsp->PersistentFileId, tcon->tid, ses->Suid,
2964 				    CREATE_NOT_FILE, FILE_WRITE_ATTRIBUTES);
2965 
2966 	SMB2_close(xid, tcon, rsp->PersistentFileId, rsp->VolatileFileId);
2967 
2968 	/* Eventually save off posix specific response info and timestamps */
2969 
2970 err_free_rsp_buf:
2971 	free_rsp_buf(resp_buftype, rsp_iov.iov_base);
2972 	kfree(pc_buf);
2973 err_free_req:
2974 	cifs_small_buf_release(req);
2975 err_free_path:
2976 	kfree(utf16_path);
2977 
2978 	if (is_replayable_error(rc) &&
2979 	    smb2_should_replay(tcon, &retries, &cur_sleep))
2980 		goto replay_again;
2981 
2982 	return rc;
2983 }
2984 
2985 int
SMB2_open_init(struct cifs_tcon * tcon,struct TCP_Server_Info * server,struct smb_rqst * rqst,__u8 * oplock,struct cifs_open_parms * oparms,__le16 * path)2986 SMB2_open_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
2987 	       struct smb_rqst *rqst, __u8 *oplock,
2988 	       struct cifs_open_parms *oparms, __le16 *path)
2989 {
2990 	struct smb2_create_req *req;
2991 	unsigned int n_iov = 2;
2992 	__u32 file_attributes = 0;
2993 	int copy_size;
2994 	int uni_path_len;
2995 	unsigned int total_len;
2996 	struct kvec *iov = rqst->rq_iov;
2997 	__le16 *copy_path;
2998 	int rc;
2999 
3000 	rc = smb2_plain_req_init(SMB2_CREATE, tcon, server,
3001 				 (void **) &req, &total_len);
3002 	if (rc)
3003 		return rc;
3004 
3005 	iov[0].iov_base = (char *)req;
3006 	/* -1 since last byte is buf[0] which is sent below (path) */
3007 	iov[0].iov_len = total_len - 1;
3008 
3009 	if (oparms->create_options & CREATE_OPTION_READONLY)
3010 		file_attributes |= ATTR_READONLY;
3011 	if (oparms->create_options & CREATE_OPTION_SPECIAL)
3012 		file_attributes |= ATTR_SYSTEM;
3013 
3014 	req->ImpersonationLevel = IL_IMPERSONATION;
3015 	req->DesiredAccess = cpu_to_le32(oparms->desired_access);
3016 	/* File attributes ignored on open (used in create though) */
3017 	req->FileAttributes = cpu_to_le32(file_attributes);
3018 	req->ShareAccess = FILE_SHARE_ALL_LE;
3019 
3020 	req->CreateDisposition = cpu_to_le32(oparms->disposition);
3021 	req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
3022 	req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
3023 
3024 	/* [MS-SMB2] 2.2.13 NameOffset:
3025 	 * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
3026 	 * the SMB2 header, the file name includes a prefix that will
3027 	 * be processed during DFS name normalization as specified in
3028 	 * section 3.3.5.9. Otherwise, the file name is relative to
3029 	 * the share that is identified by the TreeId in the SMB2
3030 	 * header.
3031 	 */
3032 	if (tcon->share_flags & SHI1005_FLAGS_DFS) {
3033 		int name_len;
3034 
3035 		req->hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
3036 		rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
3037 						 &name_len,
3038 						 tcon->tree_name, path);
3039 		if (rc)
3040 			return rc;
3041 		req->NameLength = cpu_to_le16(name_len * 2);
3042 		uni_path_len = copy_size;
3043 		path = copy_path;
3044 	} else {
3045 		uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
3046 		/* MUST set path len (NameLength) to 0 opening root of share */
3047 		req->NameLength = cpu_to_le16(uni_path_len - 2);
3048 		copy_size = round_up(uni_path_len, 8);
3049 		copy_path = kzalloc(copy_size, GFP_KERNEL);
3050 		if (!copy_path)
3051 			return -ENOMEM;
3052 		memcpy((char *)copy_path, (const char *)path,
3053 		       uni_path_len);
3054 		uni_path_len = copy_size;
3055 		path = copy_path;
3056 	}
3057 
3058 	iov[1].iov_len = uni_path_len;
3059 	iov[1].iov_base = path;
3060 
3061 	if ((!server->oplocks) || (tcon->no_lease))
3062 		*oplock = SMB2_OPLOCK_LEVEL_NONE;
3063 
3064 	if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
3065 	    *oplock == SMB2_OPLOCK_LEVEL_NONE)
3066 		req->RequestedOplockLevel = *oplock;
3067 	else if (!(server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING) &&
3068 		  (oparms->create_options & CREATE_NOT_FILE))
3069 		req->RequestedOplockLevel = *oplock; /* no srv lease support */
3070 	else {
3071 		rc = add_lease_context(server, req, iov, &n_iov,
3072 				       oparms->fid->lease_key, oplock);
3073 		if (rc)
3074 			return rc;
3075 	}
3076 
3077 	if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
3078 		rc = add_durable_context(iov, &n_iov, oparms,
3079 					tcon->use_persistent);
3080 		if (rc)
3081 			return rc;
3082 	}
3083 
3084 	if (tcon->posix_extensions) {
3085 		rc = add_posix_context(iov, &n_iov, oparms->mode);
3086 		if (rc)
3087 			return rc;
3088 	}
3089 
3090 	if (tcon->snapshot_time) {
3091 		cifs_dbg(FYI, "adding snapshot context\n");
3092 		rc = add_twarp_context(iov, &n_iov, tcon->snapshot_time);
3093 		if (rc)
3094 			return rc;
3095 	}
3096 
3097 	if ((oparms->disposition != FILE_OPEN) && (oparms->cifs_sb)) {
3098 		bool set_mode;
3099 		bool set_owner;
3100 
3101 		if ((oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID) &&
3102 		    (oparms->mode != ACL_NO_MODE))
3103 			set_mode = true;
3104 		else {
3105 			set_mode = false;
3106 			oparms->mode = ACL_NO_MODE;
3107 		}
3108 
3109 		if (oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
3110 			set_owner = true;
3111 		else
3112 			set_owner = false;
3113 
3114 		if (set_owner | set_mode) {
3115 			cifs_dbg(FYI, "add sd with mode 0x%x\n", oparms->mode);
3116 			rc = add_sd_context(iov, &n_iov, oparms->mode, set_owner);
3117 			if (rc)
3118 				return rc;
3119 		}
3120 	}
3121 
3122 	add_query_id_context(iov, &n_iov);
3123 	add_ea_context(oparms, iov, &n_iov);
3124 
3125 	if (n_iov > 2) {
3126 		/*
3127 		 * We have create contexts behind iov[1] (the file
3128 		 * name), point at them from the main create request
3129 		 */
3130 		req->CreateContextsOffset = cpu_to_le32(
3131 			sizeof(struct smb2_create_req) +
3132 			iov[1].iov_len);
3133 		req->CreateContextsLength = 0;
3134 
3135 		for (unsigned int i = 2; i < (n_iov-1); i++) {
3136 			struct kvec *v = &iov[i];
3137 			size_t len = v->iov_len;
3138 			struct create_context *cctx =
3139 				(struct create_context *)v->iov_base;
3140 
3141 			cctx->Next = cpu_to_le32(len);
3142 			le32_add_cpu(&req->CreateContextsLength, len);
3143 		}
3144 		le32_add_cpu(&req->CreateContextsLength,
3145 			     iov[n_iov-1].iov_len);
3146 	}
3147 
3148 	rqst->rq_nvec = n_iov;
3149 	return 0;
3150 }
3151 
3152 /* rq_iov[0] is the request and is released by cifs_small_buf_release().
3153  * All other vectors are freed by kfree().
3154  */
3155 void
SMB2_open_free(struct smb_rqst * rqst)3156 SMB2_open_free(struct smb_rqst *rqst)
3157 {
3158 	int i;
3159 
3160 	if (rqst && rqst->rq_iov) {
3161 		cifs_small_buf_release(rqst->rq_iov[0].iov_base);
3162 		for (i = 1; i < rqst->rq_nvec; i++)
3163 			if (rqst->rq_iov[i].iov_base != smb2_padding)
3164 				kfree(rqst->rq_iov[i].iov_base);
3165 	}
3166 }
3167 
3168 int
SMB2_open(const unsigned int xid,struct cifs_open_parms * oparms,__le16 * path,__u8 * oplock,struct smb2_file_all_info * buf,struct create_posix_rsp * posix,struct kvec * err_iov,int * buftype)3169 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
3170 	  __u8 *oplock, struct smb2_file_all_info *buf,
3171 	  struct create_posix_rsp *posix,
3172 	  struct kvec *err_iov, int *buftype)
3173 {
3174 	struct smb_rqst rqst;
3175 	struct smb2_create_rsp *rsp = NULL;
3176 	struct cifs_tcon *tcon = oparms->tcon;
3177 	struct cifs_ses *ses = tcon->ses;
3178 	struct TCP_Server_Info *server;
3179 	struct kvec iov[SMB2_CREATE_IOV_SIZE];
3180 	struct kvec rsp_iov = {NULL, 0};
3181 	int resp_buftype = CIFS_NO_BUFFER;
3182 	int rc = 0;
3183 	int flags = 0;
3184 	int retries = 0, cur_sleep = 1;
3185 
3186 replay_again:
3187 	/* reinitialize for possible replay */
3188 	flags = 0;
3189 	server = cifs_pick_channel(ses);
3190 	oparms->replay = !!(retries);
3191 
3192 	cifs_dbg(FYI, "create/open\n");
3193 	if (!ses || !server)
3194 		return -EIO;
3195 
3196 	if (smb3_encryption_required(tcon))
3197 		flags |= CIFS_TRANSFORM_REQ;
3198 
3199 	memset(&rqst, 0, sizeof(struct smb_rqst));
3200 	memset(&iov, 0, sizeof(iov));
3201 	rqst.rq_iov = iov;
3202 	rqst.rq_nvec = SMB2_CREATE_IOV_SIZE;
3203 
3204 	rc = SMB2_open_init(tcon, server,
3205 			    &rqst, oplock, oparms, path);
3206 	if (rc)
3207 		goto creat_exit;
3208 
3209 	trace_smb3_open_enter(xid, tcon->tid, tcon->ses->Suid, oparms->path,
3210 		oparms->create_options, oparms->desired_access);
3211 
3212 	if (retries)
3213 		smb2_set_replay(server, &rqst);
3214 
3215 	rc = cifs_send_recv(xid, ses, server,
3216 			    &rqst, &resp_buftype, flags,
3217 			    &rsp_iov);
3218 	rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
3219 
3220 	if (rc != 0) {
3221 		cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
3222 		if (err_iov && rsp) {
3223 			*err_iov = rsp_iov;
3224 			*buftype = resp_buftype;
3225 			resp_buftype = CIFS_NO_BUFFER;
3226 			rsp = NULL;
3227 		}
3228 		trace_smb3_open_err(xid, tcon->tid, ses->Suid,
3229 				    oparms->create_options, oparms->desired_access, rc);
3230 		if (rc == -EREMCHG) {
3231 			pr_warn_once("server share %s deleted\n",
3232 				     tcon->tree_name);
3233 			tcon->need_reconnect = true;
3234 		}
3235 		goto creat_exit;
3236 	} else if (rsp == NULL) /* unlikely to happen, but safer to check */
3237 		goto creat_exit;
3238 	else
3239 		trace_smb3_open_done(xid, rsp->PersistentFileId, tcon->tid, ses->Suid,
3240 				     oparms->create_options, oparms->desired_access);
3241 
3242 	atomic_inc(&tcon->num_remote_opens);
3243 	oparms->fid->persistent_fid = rsp->PersistentFileId;
3244 	oparms->fid->volatile_fid = rsp->VolatileFileId;
3245 	oparms->fid->access = oparms->desired_access;
3246 #ifdef CONFIG_CIFS_DEBUG2
3247 	oparms->fid->mid = le64_to_cpu(rsp->hdr.MessageId);
3248 #endif /* CIFS_DEBUG2 */
3249 
3250 	if (buf) {
3251 		buf->CreationTime = rsp->CreationTime;
3252 		buf->LastAccessTime = rsp->LastAccessTime;
3253 		buf->LastWriteTime = rsp->LastWriteTime;
3254 		buf->ChangeTime = rsp->ChangeTime;
3255 		buf->AllocationSize = rsp->AllocationSize;
3256 		buf->EndOfFile = rsp->EndofFile;
3257 		buf->Attributes = rsp->FileAttributes;
3258 		buf->NumberOfLinks = cpu_to_le32(1);
3259 		buf->DeletePending = 0;
3260 	}
3261 
3262 
3263 	rc = smb2_parse_contexts(server, &rsp_iov, &oparms->fid->epoch,
3264 				 oparms->fid->lease_key, oplock, buf, posix);
3265 creat_exit:
3266 	SMB2_open_free(&rqst);
3267 	free_rsp_buf(resp_buftype, rsp);
3268 
3269 	if (is_replayable_error(rc) &&
3270 	    smb2_should_replay(tcon, &retries, &cur_sleep))
3271 		goto replay_again;
3272 
3273 	return rc;
3274 }
3275 
3276 int
SMB2_ioctl_init(struct cifs_tcon * tcon,struct TCP_Server_Info * server,struct smb_rqst * rqst,u64 persistent_fid,u64 volatile_fid,u32 opcode,char * in_data,u32 indatalen,__u32 max_response_size)3277 SMB2_ioctl_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3278 		struct smb_rqst *rqst,
3279 		u64 persistent_fid, u64 volatile_fid, u32 opcode,
3280 		char *in_data, u32 indatalen,
3281 		__u32 max_response_size)
3282 {
3283 	struct smb2_ioctl_req *req;
3284 	struct kvec *iov = rqst->rq_iov;
3285 	unsigned int total_len;
3286 	int rc;
3287 	char *in_data_buf;
3288 
3289 	rc = smb2_ioctl_req_init(opcode, tcon, server,
3290 				 (void **) &req, &total_len);
3291 	if (rc)
3292 		return rc;
3293 
3294 	if (indatalen) {
3295 		/*
3296 		 * indatalen is usually small at a couple of bytes max, so
3297 		 * just allocate through generic pool
3298 		 */
3299 		in_data_buf = kmemdup(in_data, indatalen, GFP_NOFS);
3300 		if (!in_data_buf) {
3301 			cifs_small_buf_release(req);
3302 			return -ENOMEM;
3303 		}
3304 	}
3305 
3306 	req->CtlCode = cpu_to_le32(opcode);
3307 	req->PersistentFileId = persistent_fid;
3308 	req->VolatileFileId = volatile_fid;
3309 
3310 	iov[0].iov_base = (char *)req;
3311 	/*
3312 	 * If no input data, the size of ioctl struct in
3313 	 * protocol spec still includes a 1 byte data buffer,
3314 	 * but if input data passed to ioctl, we do not
3315 	 * want to double count this, so we do not send
3316 	 * the dummy one byte of data in iovec[0] if sending
3317 	 * input data (in iovec[1]).
3318 	 */
3319 	if (indatalen) {
3320 		req->InputCount = cpu_to_le32(indatalen);
3321 		/* do not set InputOffset if no input data */
3322 		req->InputOffset =
3323 		       cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer));
3324 		rqst->rq_nvec = 2;
3325 		iov[0].iov_len = total_len - 1;
3326 		iov[1].iov_base = in_data_buf;
3327 		iov[1].iov_len = indatalen;
3328 	} else {
3329 		rqst->rq_nvec = 1;
3330 		iov[0].iov_len = total_len;
3331 	}
3332 
3333 	req->OutputOffset = 0;
3334 	req->OutputCount = 0; /* MBZ */
3335 
3336 	/*
3337 	 * In most cases max_response_size is set to 16K (CIFSMaxBufSize)
3338 	 * We Could increase default MaxOutputResponse, but that could require
3339 	 * more credits. Windows typically sets this smaller, but for some
3340 	 * ioctls it may be useful to allow server to send more. No point
3341 	 * limiting what the server can send as long as fits in one credit
3342 	 * We can not handle more than CIFS_MAX_BUF_SIZE yet but may want
3343 	 * to increase this limit up in the future.
3344 	 * Note that for snapshot queries that servers like Azure expect that
3345 	 * the first query be minimal size (and just used to get the number/size
3346 	 * of previous versions) so response size must be specified as EXACTLY
3347 	 * sizeof(struct snapshot_array) which is 16 when rounded up to multiple
3348 	 * of eight bytes.  Currently that is the only case where we set max
3349 	 * response size smaller.
3350 	 */
3351 	req->MaxOutputResponse = cpu_to_le32(max_response_size);
3352 	req->hdr.CreditCharge =
3353 		cpu_to_le16(DIV_ROUND_UP(max(indatalen, max_response_size),
3354 					 SMB2_MAX_BUFFER_SIZE));
3355 	/* always an FSCTL (for now) */
3356 	req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
3357 
3358 	/* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
3359 	if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
3360 		req->hdr.Flags |= SMB2_FLAGS_SIGNED;
3361 
3362 	return 0;
3363 }
3364 
3365 void
SMB2_ioctl_free(struct smb_rqst * rqst)3366 SMB2_ioctl_free(struct smb_rqst *rqst)
3367 {
3368 	int i;
3369 
3370 	if (rqst && rqst->rq_iov) {
3371 		cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3372 		for (i = 1; i < rqst->rq_nvec; i++)
3373 			if (rqst->rq_iov[i].iov_base != smb2_padding)
3374 				kfree(rqst->rq_iov[i].iov_base);
3375 	}
3376 }
3377 
3378 
3379 /*
3380  *	SMB2 IOCTL is used for both IOCTLs and FSCTLs
3381  */
3382 int
SMB2_ioctl(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid,u32 opcode,char * in_data,u32 indatalen,u32 max_out_data_len,char ** out_data,u32 * plen)3383 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3384 	   u64 volatile_fid, u32 opcode, char *in_data, u32 indatalen,
3385 	   u32 max_out_data_len, char **out_data,
3386 	   u32 *plen /* returned data len */)
3387 {
3388 	struct smb_rqst rqst;
3389 	struct smb2_ioctl_rsp *rsp = NULL;
3390 	struct cifs_ses *ses;
3391 	struct TCP_Server_Info *server;
3392 	struct kvec iov[SMB2_IOCTL_IOV_SIZE];
3393 	struct kvec rsp_iov = {NULL, 0};
3394 	int resp_buftype = CIFS_NO_BUFFER;
3395 	int rc = 0;
3396 	int flags = 0;
3397 	int retries = 0, cur_sleep = 1;
3398 
3399 	if (!tcon)
3400 		return -EIO;
3401 
3402 	ses = tcon->ses;
3403 	if (!ses)
3404 		return -EIO;
3405 
3406 replay_again:
3407 	/* reinitialize for possible replay */
3408 	flags = 0;
3409 	server = cifs_pick_channel(ses);
3410 
3411 	if (!server)
3412 		return -EIO;
3413 
3414 	cifs_dbg(FYI, "SMB2 IOCTL\n");
3415 
3416 	if (out_data != NULL)
3417 		*out_data = NULL;
3418 
3419 	/* zero out returned data len, in case of error */
3420 	if (plen)
3421 		*plen = 0;
3422 
3423 	if (smb3_encryption_required(tcon))
3424 		flags |= CIFS_TRANSFORM_REQ;
3425 
3426 	memset(&rqst, 0, sizeof(struct smb_rqst));
3427 	memset(&iov, 0, sizeof(iov));
3428 	rqst.rq_iov = iov;
3429 	rqst.rq_nvec = SMB2_IOCTL_IOV_SIZE;
3430 
3431 	rc = SMB2_ioctl_init(tcon, server,
3432 			     &rqst, persistent_fid, volatile_fid, opcode,
3433 			     in_data, indatalen, max_out_data_len);
3434 	if (rc)
3435 		goto ioctl_exit;
3436 
3437 	if (retries)
3438 		smb2_set_replay(server, &rqst);
3439 
3440 	rc = cifs_send_recv(xid, ses, server,
3441 			    &rqst, &resp_buftype, flags,
3442 			    &rsp_iov);
3443 	rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
3444 
3445 	if (rc != 0)
3446 		trace_smb3_fsctl_err(xid, persistent_fid, tcon->tid,
3447 				ses->Suid, 0, opcode, rc);
3448 
3449 	if ((rc != 0) && (rc != -EINVAL) && (rc != -E2BIG)) {
3450 		cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3451 		goto ioctl_exit;
3452 	} else if (rc == -EINVAL) {
3453 		if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
3454 		    (opcode != FSCTL_SRV_COPYCHUNK)) {
3455 			cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3456 			goto ioctl_exit;
3457 		}
3458 	} else if (rc == -E2BIG) {
3459 		if (opcode != FSCTL_QUERY_ALLOCATED_RANGES) {
3460 			cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3461 			goto ioctl_exit;
3462 		}
3463 	}
3464 
3465 	/* check if caller wants to look at return data or just return rc */
3466 	if ((plen == NULL) || (out_data == NULL))
3467 		goto ioctl_exit;
3468 
3469 	/*
3470 	 * Although unlikely to be possible for rsp to be null and rc not set,
3471 	 * adding check below is slightly safer long term (and quiets Coverity
3472 	 * warning)
3473 	 */
3474 	if (rsp == NULL) {
3475 		rc = -EIO;
3476 		goto ioctl_exit;
3477 	}
3478 
3479 	*plen = le32_to_cpu(rsp->OutputCount);
3480 
3481 	/* We check for obvious errors in the output buffer length and offset */
3482 	if (*plen == 0)
3483 		goto ioctl_exit; /* server returned no data */
3484 	else if (*plen > rsp_iov.iov_len || *plen > 0xFF00) {
3485 		cifs_tcon_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
3486 		*plen = 0;
3487 		rc = -EIO;
3488 		goto ioctl_exit;
3489 	}
3490 
3491 	if (rsp_iov.iov_len - *plen < le32_to_cpu(rsp->OutputOffset)) {
3492 		cifs_tcon_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
3493 			le32_to_cpu(rsp->OutputOffset));
3494 		*plen = 0;
3495 		rc = -EIO;
3496 		goto ioctl_exit;
3497 	}
3498 
3499 	*out_data = kmemdup((char *)rsp + le32_to_cpu(rsp->OutputOffset),
3500 			    *plen, GFP_KERNEL);
3501 	if (*out_data == NULL) {
3502 		rc = -ENOMEM;
3503 		goto ioctl_exit;
3504 	}
3505 
3506 ioctl_exit:
3507 	SMB2_ioctl_free(&rqst);
3508 	free_rsp_buf(resp_buftype, rsp);
3509 
3510 	if (is_replayable_error(rc) &&
3511 	    smb2_should_replay(tcon, &retries, &cur_sleep))
3512 		goto replay_again;
3513 
3514 	return rc;
3515 }
3516 
3517 /*
3518  *   Individual callers to ioctl worker function follow
3519  */
3520 
3521 int
SMB2_set_compression(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid)3522 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
3523 		     u64 persistent_fid, u64 volatile_fid)
3524 {
3525 	int rc;
3526 	struct  compress_ioctl fsctl_input;
3527 	char *ret_data = NULL;
3528 
3529 	fsctl_input.CompressionState =
3530 			cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
3531 
3532 	rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
3533 			FSCTL_SET_COMPRESSION,
3534 			(char *)&fsctl_input /* data input */,
3535 			2 /* in data len */, CIFSMaxBufSize /* max out data */,
3536 			&ret_data /* out data */, NULL);
3537 
3538 	cifs_dbg(FYI, "set compression rc %d\n", rc);
3539 
3540 	return rc;
3541 }
3542 
3543 int
SMB2_close_init(struct cifs_tcon * tcon,struct TCP_Server_Info * server,struct smb_rqst * rqst,u64 persistent_fid,u64 volatile_fid,bool query_attrs)3544 SMB2_close_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3545 		struct smb_rqst *rqst,
3546 		u64 persistent_fid, u64 volatile_fid, bool query_attrs)
3547 {
3548 	struct smb2_close_req *req;
3549 	struct kvec *iov = rqst->rq_iov;
3550 	unsigned int total_len;
3551 	int rc;
3552 
3553 	rc = smb2_plain_req_init(SMB2_CLOSE, tcon, server,
3554 				 (void **) &req, &total_len);
3555 	if (rc)
3556 		return rc;
3557 
3558 	req->PersistentFileId = persistent_fid;
3559 	req->VolatileFileId = volatile_fid;
3560 	if (query_attrs)
3561 		req->Flags = SMB2_CLOSE_FLAG_POSTQUERY_ATTRIB;
3562 	else
3563 		req->Flags = 0;
3564 	iov[0].iov_base = (char *)req;
3565 	iov[0].iov_len = total_len;
3566 
3567 	return 0;
3568 }
3569 
3570 void
SMB2_close_free(struct smb_rqst * rqst)3571 SMB2_close_free(struct smb_rqst *rqst)
3572 {
3573 	if (rqst && rqst->rq_iov)
3574 		cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3575 }
3576 
3577 int
__SMB2_close(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid,struct smb2_file_network_open_info * pbuf)3578 __SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
3579 	     u64 persistent_fid, u64 volatile_fid,
3580 	     struct smb2_file_network_open_info *pbuf)
3581 {
3582 	struct smb_rqst rqst;
3583 	struct smb2_close_rsp *rsp = NULL;
3584 	struct cifs_ses *ses = tcon->ses;
3585 	struct TCP_Server_Info *server;
3586 	struct kvec iov[1];
3587 	struct kvec rsp_iov;
3588 	int resp_buftype = CIFS_NO_BUFFER;
3589 	int rc = 0;
3590 	int flags = 0;
3591 	bool query_attrs = false;
3592 	int retries = 0, cur_sleep = 1;
3593 
3594 replay_again:
3595 	/* reinitialize for possible replay */
3596 	flags = 0;
3597 	query_attrs = false;
3598 	server = cifs_pick_channel(ses);
3599 
3600 	cifs_dbg(FYI, "Close\n");
3601 
3602 	if (!ses || !server)
3603 		return -EIO;
3604 
3605 	if (smb3_encryption_required(tcon))
3606 		flags |= CIFS_TRANSFORM_REQ;
3607 
3608 	memset(&rqst, 0, sizeof(struct smb_rqst));
3609 	memset(&iov, 0, sizeof(iov));
3610 	rqst.rq_iov = iov;
3611 	rqst.rq_nvec = 1;
3612 
3613 	/* check if need to ask server to return timestamps in close response */
3614 	if (pbuf)
3615 		query_attrs = true;
3616 
3617 	trace_smb3_close_enter(xid, persistent_fid, tcon->tid, ses->Suid);
3618 	rc = SMB2_close_init(tcon, server,
3619 			     &rqst, persistent_fid, volatile_fid,
3620 			     query_attrs);
3621 	if (rc)
3622 		goto close_exit;
3623 
3624 	if (retries)
3625 		smb2_set_replay(server, &rqst);
3626 
3627 	rc = cifs_send_recv(xid, ses, server,
3628 			    &rqst, &resp_buftype, flags, &rsp_iov);
3629 	rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
3630 
3631 	if (rc != 0) {
3632 		cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
3633 		trace_smb3_close_err(xid, persistent_fid, tcon->tid, ses->Suid,
3634 				     rc);
3635 		goto close_exit;
3636 	} else {
3637 		trace_smb3_close_done(xid, persistent_fid, tcon->tid,
3638 				      ses->Suid);
3639 		if (pbuf)
3640 			memcpy(&pbuf->network_open_info,
3641 			       &rsp->network_open_info,
3642 			       sizeof(pbuf->network_open_info));
3643 		atomic_dec(&tcon->num_remote_opens);
3644 	}
3645 
3646 close_exit:
3647 	SMB2_close_free(&rqst);
3648 	free_rsp_buf(resp_buftype, rsp);
3649 
3650 	/* retry close in a worker thread if this one is interrupted */
3651 	if (is_interrupt_error(rc)) {
3652 		int tmp_rc;
3653 
3654 		tmp_rc = smb2_handle_cancelled_close(tcon, persistent_fid,
3655 						     volatile_fid);
3656 		if (tmp_rc)
3657 			cifs_dbg(VFS, "handle cancelled close fid 0x%llx returned error %d\n",
3658 				 persistent_fid, tmp_rc);
3659 	}
3660 
3661 	if (is_replayable_error(rc) &&
3662 	    smb2_should_replay(tcon, &retries, &cur_sleep))
3663 		goto replay_again;
3664 
3665 	return rc;
3666 }
3667 
3668 int
SMB2_close(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid)3669 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
3670 		u64 persistent_fid, u64 volatile_fid)
3671 {
3672 	return __SMB2_close(xid, tcon, persistent_fid, volatile_fid, NULL);
3673 }
3674 
3675 int
smb2_validate_iov(unsigned int offset,unsigned int buffer_length,struct kvec * iov,unsigned int min_buf_size)3676 smb2_validate_iov(unsigned int offset, unsigned int buffer_length,
3677 		  struct kvec *iov, unsigned int min_buf_size)
3678 {
3679 	unsigned int smb_len = iov->iov_len;
3680 	char *end_of_smb = smb_len + (char *)iov->iov_base;
3681 	char *begin_of_buf = offset + (char *)iov->iov_base;
3682 	char *end_of_buf = begin_of_buf + buffer_length;
3683 
3684 
3685 	if (buffer_length < min_buf_size) {
3686 		cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
3687 			 buffer_length, min_buf_size);
3688 		return -EINVAL;
3689 	}
3690 
3691 	/* check if beyond RFC1001 maximum length */
3692 	if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
3693 		cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
3694 			 buffer_length, smb_len);
3695 		return -EINVAL;
3696 	}
3697 
3698 	if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
3699 		cifs_dbg(VFS, "Invalid server response, bad offset to data\n");
3700 		return -EINVAL;
3701 	}
3702 
3703 	return 0;
3704 }
3705 
3706 /*
3707  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
3708  * Caller must free buffer.
3709  */
3710 int
smb2_validate_and_copy_iov(unsigned int offset,unsigned int buffer_length,struct kvec * iov,unsigned int minbufsize,char * data)3711 smb2_validate_and_copy_iov(unsigned int offset, unsigned int buffer_length,
3712 			   struct kvec *iov, unsigned int minbufsize,
3713 			   char *data)
3714 {
3715 	char *begin_of_buf = offset + (char *)iov->iov_base;
3716 	int rc;
3717 
3718 	if (!data)
3719 		return -EINVAL;
3720 
3721 	rc = smb2_validate_iov(offset, buffer_length, iov, minbufsize);
3722 	if (rc)
3723 		return rc;
3724 
3725 	memcpy(data, begin_of_buf, minbufsize);
3726 
3727 	return 0;
3728 }
3729 
3730 int
SMB2_query_info_init(struct cifs_tcon * tcon,struct TCP_Server_Info * server,struct smb_rqst * rqst,u64 persistent_fid,u64 volatile_fid,u8 info_class,u8 info_type,u32 additional_info,size_t output_len,size_t input_len,void * input)3731 SMB2_query_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3732 		     struct smb_rqst *rqst,
3733 		     u64 persistent_fid, u64 volatile_fid,
3734 		     u8 info_class, u8 info_type, u32 additional_info,
3735 		     size_t output_len, size_t input_len, void *input)
3736 {
3737 	struct smb2_query_info_req *req;
3738 	struct kvec *iov = rqst->rq_iov;
3739 	unsigned int total_len;
3740 	size_t len;
3741 	int rc;
3742 
3743 	if (unlikely(check_add_overflow(input_len, sizeof(*req), &len) ||
3744 		     len > CIFSMaxBufSize))
3745 		return -EINVAL;
3746 
3747 	rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server,
3748 				 (void **) &req, &total_len);
3749 	if (rc)
3750 		return rc;
3751 
3752 	req->InfoType = info_type;
3753 	req->FileInfoClass = info_class;
3754 	req->PersistentFileId = persistent_fid;
3755 	req->VolatileFileId = volatile_fid;
3756 	req->AdditionalInformation = cpu_to_le32(additional_info);
3757 
3758 	req->OutputBufferLength = cpu_to_le32(output_len);
3759 	if (input_len) {
3760 		req->InputBufferLength = cpu_to_le32(input_len);
3761 		/* total_len for smb query request never close to le16 max */
3762 		req->InputBufferOffset = cpu_to_le16(total_len - 1);
3763 		memcpy(req->Buffer, input, input_len);
3764 	}
3765 
3766 	iov[0].iov_base = (char *)req;
3767 	/* 1 for Buffer */
3768 	iov[0].iov_len = len;
3769 	return 0;
3770 }
3771 
3772 void
SMB2_query_info_free(struct smb_rqst * rqst)3773 SMB2_query_info_free(struct smb_rqst *rqst)
3774 {
3775 	if (rqst && rqst->rq_iov)
3776 		cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
3777 }
3778 
3779 static int
query_info(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid,u8 info_class,u8 info_type,u32 additional_info,size_t output_len,size_t min_len,void ** data,u32 * dlen)3780 query_info(const unsigned int xid, struct cifs_tcon *tcon,
3781 	   u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,
3782 	   u32 additional_info, size_t output_len, size_t min_len, void **data,
3783 		u32 *dlen)
3784 {
3785 	struct smb_rqst rqst;
3786 	struct smb2_query_info_rsp *rsp = NULL;
3787 	struct kvec iov[1];
3788 	struct kvec rsp_iov;
3789 	int rc = 0;
3790 	int resp_buftype = CIFS_NO_BUFFER;
3791 	struct cifs_ses *ses = tcon->ses;
3792 	struct TCP_Server_Info *server;
3793 	int flags = 0;
3794 	bool allocated = false;
3795 	int retries = 0, cur_sleep = 1;
3796 
3797 	cifs_dbg(FYI, "Query Info\n");
3798 
3799 	if (!ses)
3800 		return -EIO;
3801 
3802 replay_again:
3803 	/* reinitialize for possible replay */
3804 	flags = 0;
3805 	allocated = false;
3806 	server = cifs_pick_channel(ses);
3807 
3808 	if (!server)
3809 		return -EIO;
3810 
3811 	if (smb3_encryption_required(tcon))
3812 		flags |= CIFS_TRANSFORM_REQ;
3813 
3814 	memset(&rqst, 0, sizeof(struct smb_rqst));
3815 	memset(&iov, 0, sizeof(iov));
3816 	rqst.rq_iov = iov;
3817 	rqst.rq_nvec = 1;
3818 
3819 	rc = SMB2_query_info_init(tcon, server,
3820 				  &rqst, persistent_fid, volatile_fid,
3821 				  info_class, info_type, additional_info,
3822 				  output_len, 0, NULL);
3823 	if (rc)
3824 		goto qinf_exit;
3825 
3826 	trace_smb3_query_info_enter(xid, persistent_fid, tcon->tid,
3827 				    ses->Suid, info_class, (__u32)info_type);
3828 
3829 	if (retries)
3830 		smb2_set_replay(server, &rqst);
3831 
3832 	rc = cifs_send_recv(xid, ses, server,
3833 			    &rqst, &resp_buftype, flags, &rsp_iov);
3834 	rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3835 
3836 	if (rc) {
3837 		cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3838 		trace_smb3_query_info_err(xid, persistent_fid, tcon->tid,
3839 				ses->Suid, info_class, (__u32)info_type, rc);
3840 		goto qinf_exit;
3841 	}
3842 
3843 	trace_smb3_query_info_done(xid, persistent_fid, tcon->tid,
3844 				ses->Suid, info_class, (__u32)info_type);
3845 
3846 	if (dlen) {
3847 		*dlen = le32_to_cpu(rsp->OutputBufferLength);
3848 		if (!*data) {
3849 			*data = kmalloc(*dlen, GFP_KERNEL);
3850 			if (!*data) {
3851 				cifs_tcon_dbg(VFS,
3852 					"Error %d allocating memory for acl\n",
3853 					rc);
3854 				*dlen = 0;
3855 				rc = -ENOMEM;
3856 				goto qinf_exit;
3857 			}
3858 			allocated = true;
3859 		}
3860 	}
3861 
3862 	rc = smb2_validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset),
3863 					le32_to_cpu(rsp->OutputBufferLength),
3864 					&rsp_iov, dlen ? *dlen : min_len, *data);
3865 	if (rc && allocated) {
3866 		kfree(*data);
3867 		*data = NULL;
3868 		*dlen = 0;
3869 	}
3870 
3871 qinf_exit:
3872 	SMB2_query_info_free(&rqst);
3873 	free_rsp_buf(resp_buftype, rsp);
3874 
3875 	if (is_replayable_error(rc) &&
3876 	    smb2_should_replay(tcon, &retries, &cur_sleep))
3877 		goto replay_again;
3878 
3879 	return rc;
3880 }
3881 
SMB2_query_info(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid,struct smb2_file_all_info * data)3882 int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
3883 	u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
3884 {
3885 	return query_info(xid, tcon, persistent_fid, volatile_fid,
3886 			  FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,
3887 			  sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
3888 			  sizeof(struct smb2_file_all_info), (void **)&data,
3889 			  NULL);
3890 }
3891 
3892 #if 0
3893 /* currently unused, as now we are doing compounding instead (see smb311_posix_query_path_info) */
3894 int
3895 SMB311_posix_query_info(const unsigned int xid, struct cifs_tcon *tcon,
3896 		u64 persistent_fid, u64 volatile_fid, struct smb311_posix_qinfo *data, u32 *plen)
3897 {
3898 	size_t output_len = sizeof(struct smb311_posix_qinfo *) +
3899 			(sizeof(struct smb_sid) * 2) + (PATH_MAX * 2);
3900 	*plen = 0;
3901 
3902 	return query_info(xid, tcon, persistent_fid, volatile_fid,
3903 			  SMB_FIND_FILE_POSIX_INFO, SMB2_O_INFO_FILE, 0,
3904 			  output_len, sizeof(struct smb311_posix_qinfo), (void **)&data, plen);
3905 	/* Note caller must free "data" (passed in above). It may be allocated in query_info call */
3906 }
3907 #endif
3908 
3909 int
SMB2_query_acl(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid,void ** data,u32 * plen,u32 extra_info)3910 SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
3911 	       u64 persistent_fid, u64 volatile_fid,
3912 	       void **data, u32 *plen, u32 extra_info)
3913 {
3914 	*plen = 0;
3915 
3916 	return query_info(xid, tcon, persistent_fid, volatile_fid,
3917 			  0, SMB2_O_INFO_SECURITY, extra_info,
3918 			  SMB2_MAX_BUFFER_SIZE, MIN_SEC_DESC_LEN, data, plen);
3919 }
3920 
3921 int
SMB2_get_srv_num(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid,__le64 * uniqueid)3922 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
3923 		 u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
3924 {
3925 	return query_info(xid, tcon, persistent_fid, volatile_fid,
3926 			  FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
3927 			  sizeof(struct smb2_file_internal_info),
3928 			  sizeof(struct smb2_file_internal_info),
3929 			  (void **)&uniqueid, NULL);
3930 }
3931 
3932 /*
3933  * CHANGE_NOTIFY Request is sent to get notifications on changes to a directory
3934  * See MS-SMB2 2.2.35 and 2.2.36
3935  */
3936 
3937 static int
SMB2_notify_init(const unsigned int xid,struct smb_rqst * rqst,struct cifs_tcon * tcon,struct TCP_Server_Info * server,u64 persistent_fid,u64 volatile_fid,u32 completion_filter,bool watch_tree)3938 SMB2_notify_init(const unsigned int xid, struct smb_rqst *rqst,
3939 		 struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3940 		 u64 persistent_fid, u64 volatile_fid,
3941 		 u32 completion_filter, bool watch_tree)
3942 {
3943 	struct smb2_change_notify_req *req;
3944 	struct kvec *iov = rqst->rq_iov;
3945 	unsigned int total_len;
3946 	int rc;
3947 
3948 	rc = smb2_plain_req_init(SMB2_CHANGE_NOTIFY, tcon, server,
3949 				 (void **) &req, &total_len);
3950 	if (rc)
3951 		return rc;
3952 
3953 	req->PersistentFileId = persistent_fid;
3954 	req->VolatileFileId = volatile_fid;
3955 	/* See note 354 of MS-SMB2, 64K max */
3956 	req->OutputBufferLength =
3957 		cpu_to_le32(SMB2_MAX_BUFFER_SIZE - MAX_SMB2_HDR_SIZE);
3958 	req->CompletionFilter = cpu_to_le32(completion_filter);
3959 	if (watch_tree)
3960 		req->Flags = cpu_to_le16(SMB2_WATCH_TREE);
3961 	else
3962 		req->Flags = 0;
3963 
3964 	iov[0].iov_base = (char *)req;
3965 	iov[0].iov_len = total_len;
3966 
3967 	return 0;
3968 }
3969 
3970 int
SMB2_change_notify(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid,bool watch_tree,u32 completion_filter,u32 max_out_data_len,char ** out_data,u32 * plen)3971 SMB2_change_notify(const unsigned int xid, struct cifs_tcon *tcon,
3972 		u64 persistent_fid, u64 volatile_fid, bool watch_tree,
3973 		u32 completion_filter, u32 max_out_data_len, char **out_data,
3974 		u32 *plen /* returned data len */)
3975 {
3976 	struct cifs_ses *ses = tcon->ses;
3977 	struct TCP_Server_Info *server;
3978 	struct smb_rqst rqst;
3979 	struct smb2_change_notify_rsp *smb_rsp;
3980 	struct kvec iov[1];
3981 	struct kvec rsp_iov = {NULL, 0};
3982 	int resp_buftype = CIFS_NO_BUFFER;
3983 	int flags = 0;
3984 	int rc = 0;
3985 	int retries = 0, cur_sleep = 1;
3986 
3987 replay_again:
3988 	/* reinitialize for possible replay */
3989 	flags = 0;
3990 	server = cifs_pick_channel(ses);
3991 
3992 	cifs_dbg(FYI, "change notify\n");
3993 	if (!ses || !server)
3994 		return -EIO;
3995 
3996 	if (smb3_encryption_required(tcon))
3997 		flags |= CIFS_TRANSFORM_REQ;
3998 
3999 	memset(&rqst, 0, sizeof(struct smb_rqst));
4000 	memset(&iov, 0, sizeof(iov));
4001 	if (plen)
4002 		*plen = 0;
4003 
4004 	rqst.rq_iov = iov;
4005 	rqst.rq_nvec = 1;
4006 
4007 	rc = SMB2_notify_init(xid, &rqst, tcon, server,
4008 			      persistent_fid, volatile_fid,
4009 			      completion_filter, watch_tree);
4010 	if (rc)
4011 		goto cnotify_exit;
4012 
4013 	trace_smb3_notify_enter(xid, persistent_fid, tcon->tid, ses->Suid,
4014 				(u8)watch_tree, completion_filter);
4015 
4016 	if (retries)
4017 		smb2_set_replay(server, &rqst);
4018 
4019 	rc = cifs_send_recv(xid, ses, server,
4020 			    &rqst, &resp_buftype, flags, &rsp_iov);
4021 
4022 	if (rc != 0) {
4023 		cifs_stats_fail_inc(tcon, SMB2_CHANGE_NOTIFY_HE);
4024 		trace_smb3_notify_err(xid, persistent_fid, tcon->tid, ses->Suid,
4025 				(u8)watch_tree, completion_filter, rc);
4026 	} else {
4027 		trace_smb3_notify_done(xid, persistent_fid, tcon->tid,
4028 			ses->Suid, (u8)watch_tree, completion_filter);
4029 		/* validate that notify information is plausible */
4030 		if ((rsp_iov.iov_base == NULL) ||
4031 		    (rsp_iov.iov_len < sizeof(struct smb2_change_notify_rsp) + 1))
4032 			goto cnotify_exit;
4033 
4034 		smb_rsp = (struct smb2_change_notify_rsp *)rsp_iov.iov_base;
4035 
4036 		smb2_validate_iov(le16_to_cpu(smb_rsp->OutputBufferOffset),
4037 				le32_to_cpu(smb_rsp->OutputBufferLength), &rsp_iov,
4038 				sizeof(struct file_notify_information));
4039 
4040 		*out_data = kmemdup((char *)smb_rsp + le16_to_cpu(smb_rsp->OutputBufferOffset),
4041 				le32_to_cpu(smb_rsp->OutputBufferLength), GFP_KERNEL);
4042 		if (*out_data == NULL) {
4043 			rc = -ENOMEM;
4044 			goto cnotify_exit;
4045 		} else if (plen)
4046 			*plen = le32_to_cpu(smb_rsp->OutputBufferLength);
4047 	}
4048 
4049  cnotify_exit:
4050 	if (rqst.rq_iov)
4051 		cifs_small_buf_release(rqst.rq_iov[0].iov_base); /* request */
4052 	free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4053 
4054 	if (is_replayable_error(rc) &&
4055 	    smb2_should_replay(tcon, &retries, &cur_sleep))
4056 		goto replay_again;
4057 
4058 	return rc;
4059 }
4060 
4061 
4062 
4063 /*
4064  * This is a no-op for now. We're not really interested in the reply, but
4065  * rather in the fact that the server sent one and that server->lstrp
4066  * gets updated.
4067  *
4068  * FIXME: maybe we should consider checking that the reply matches request?
4069  */
4070 static void
smb2_echo_callback(struct mid_q_entry * mid)4071 smb2_echo_callback(struct mid_q_entry *mid)
4072 {
4073 	struct TCP_Server_Info *server = mid->callback_data;
4074 	struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
4075 	struct cifs_credits credits = { .value = 0, .instance = 0 };
4076 
4077 	if (mid->mid_state == MID_RESPONSE_RECEIVED
4078 	    || mid->mid_state == MID_RESPONSE_MALFORMED) {
4079 		credits.value = le16_to_cpu(rsp->hdr.CreditRequest);
4080 		credits.instance = server->reconnect_instance;
4081 	}
4082 
4083 	release_mid(mid);
4084 	add_credits(server, &credits, CIFS_ECHO_OP);
4085 }
4086 
cifs_renegotiate_iosize(struct TCP_Server_Info * server,struct cifs_tcon * tcon)4087 static void cifs_renegotiate_iosize(struct TCP_Server_Info *server,
4088 				    struct cifs_tcon *tcon)
4089 {
4090 	struct cifs_sb_info *cifs_sb;
4091 
4092 	if (server == NULL || tcon == NULL)
4093 		return;
4094 
4095 	spin_lock(&tcon->sb_list_lock);
4096 	list_for_each_entry(cifs_sb, &tcon->cifs_sb_list, tcon_sb_link)
4097 		cifs_negotiate_iosize(server, cifs_sb->ctx, tcon);
4098 	spin_unlock(&tcon->sb_list_lock);
4099 }
4100 
smb2_reconnect_server(struct work_struct * work)4101 void smb2_reconnect_server(struct work_struct *work)
4102 {
4103 	struct TCP_Server_Info *server = container_of(work,
4104 					struct TCP_Server_Info, reconnect.work);
4105 	struct TCP_Server_Info *pserver;
4106 	struct cifs_ses *ses, *ses2;
4107 	struct cifs_tcon *tcon, *tcon2;
4108 	struct list_head tmp_list, tmp_ses_list;
4109 	bool ses_exist = false;
4110 	bool tcon_selected = false;
4111 	int rc;
4112 	bool resched = false;
4113 
4114 	/* first check if ref count has reached 0, if not inc ref count */
4115 	spin_lock(&cifs_tcp_ses_lock);
4116 	if (!server->srv_count) {
4117 		spin_unlock(&cifs_tcp_ses_lock);
4118 		return;
4119 	}
4120 	server->srv_count++;
4121 	spin_unlock(&cifs_tcp_ses_lock);
4122 
4123 	/* If server is a channel, select the primary channel */
4124 	pserver = SERVER_IS_CHAN(server) ? server->primary_server : server;
4125 
4126 	/* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
4127 	mutex_lock(&pserver->reconnect_mutex);
4128 
4129 	/* if the server is marked for termination, drop the ref count here */
4130 	if (server->terminate) {
4131 		cifs_put_tcp_session(server, true);
4132 		mutex_unlock(&pserver->reconnect_mutex);
4133 		return;
4134 	}
4135 
4136 	INIT_LIST_HEAD(&tmp_list);
4137 	INIT_LIST_HEAD(&tmp_ses_list);
4138 	cifs_dbg(FYI, "Reconnecting tcons and channels\n");
4139 
4140 	spin_lock(&cifs_tcp_ses_lock);
4141 	list_for_each_entry(ses, &pserver->smb_ses_list, smb_ses_list) {
4142 		spin_lock(&ses->ses_lock);
4143 		if (ses->ses_status == SES_EXITING) {
4144 			spin_unlock(&ses->ses_lock);
4145 			continue;
4146 		}
4147 		spin_unlock(&ses->ses_lock);
4148 
4149 		tcon_selected = false;
4150 
4151 		list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
4152 			if (tcon->need_reconnect || tcon->need_reopen_files) {
4153 				tcon->tc_count++;
4154 				trace_smb3_tcon_ref(tcon->debug_id, tcon->tc_count,
4155 						    netfs_trace_tcon_ref_get_reconnect_server);
4156 				list_add_tail(&tcon->rlist, &tmp_list);
4157 				tcon_selected = true;
4158 			}
4159 		}
4160 		/*
4161 		 * IPC has the same lifetime as its session and uses its
4162 		 * refcount.
4163 		 */
4164 		if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) {
4165 			list_add_tail(&ses->tcon_ipc->rlist, &tmp_list);
4166 			tcon_selected = true;
4167 			cifs_smb_ses_inc_refcount(ses);
4168 		}
4169 		/*
4170 		 * handle the case where channel needs to reconnect
4171 		 * binding session, but tcon is healthy (some other channel
4172 		 * is active)
4173 		 */
4174 		spin_lock(&ses->chan_lock);
4175 		if (!tcon_selected && cifs_chan_needs_reconnect(ses, server)) {
4176 			list_add_tail(&ses->rlist, &tmp_ses_list);
4177 			ses_exist = true;
4178 			cifs_smb_ses_inc_refcount(ses);
4179 		}
4180 		spin_unlock(&ses->chan_lock);
4181 	}
4182 	spin_unlock(&cifs_tcp_ses_lock);
4183 
4184 	list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
4185 		rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon, server, true);
4186 		if (!rc) {
4187 			cifs_renegotiate_iosize(server, tcon);
4188 			cifs_reopen_persistent_handles(tcon);
4189 		} else
4190 			resched = true;
4191 		list_del_init(&tcon->rlist);
4192 		if (tcon->ipc)
4193 			cifs_put_smb_ses(tcon->ses);
4194 		else
4195 			cifs_put_tcon(tcon, netfs_trace_tcon_ref_put_reconnect_server);
4196 	}
4197 
4198 	if (!ses_exist)
4199 		goto done;
4200 
4201 	/* allocate a dummy tcon struct used for reconnect */
4202 	tcon = tcon_info_alloc(false, netfs_trace_tcon_ref_new_reconnect_server);
4203 	if (!tcon) {
4204 		resched = true;
4205 		list_for_each_entry_safe(ses, ses2, &tmp_ses_list, rlist) {
4206 			list_del_init(&ses->rlist);
4207 			cifs_put_smb_ses(ses);
4208 		}
4209 		goto done;
4210 	}
4211 
4212 	tcon->status = TID_GOOD;
4213 	tcon->retry = false;
4214 	tcon->need_reconnect = false;
4215 
4216 	/* now reconnect sessions for necessary channels */
4217 	list_for_each_entry_safe(ses, ses2, &tmp_ses_list, rlist) {
4218 		tcon->ses = ses;
4219 		rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon, server, true);
4220 		if (rc)
4221 			resched = true;
4222 		list_del_init(&ses->rlist);
4223 		cifs_put_smb_ses(ses);
4224 	}
4225 	tconInfoFree(tcon, netfs_trace_tcon_ref_free_reconnect_server);
4226 
4227 done:
4228 	cifs_dbg(FYI, "Reconnecting tcons and channels finished\n");
4229 	if (resched)
4230 		queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
4231 	mutex_unlock(&pserver->reconnect_mutex);
4232 
4233 	/* now we can safely release srv struct */
4234 	cifs_put_tcp_session(server, true);
4235 }
4236 
4237 int
SMB2_echo(struct TCP_Server_Info * server)4238 SMB2_echo(struct TCP_Server_Info *server)
4239 {
4240 	struct smb2_echo_req *req;
4241 	int rc = 0;
4242 	struct kvec iov[1];
4243 	struct smb_rqst rqst = { .rq_iov = iov,
4244 				 .rq_nvec = 1 };
4245 	unsigned int total_len;
4246 
4247 	cifs_dbg(FYI, "In echo request for conn_id %lld\n", server->conn_id);
4248 
4249 	spin_lock(&server->srv_lock);
4250 	if (server->ops->need_neg &&
4251 	    server->ops->need_neg(server)) {
4252 		spin_unlock(&server->srv_lock);
4253 		/* No need to send echo on newly established connections */
4254 		mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
4255 		return rc;
4256 	}
4257 	spin_unlock(&server->srv_lock);
4258 
4259 	rc = smb2_plain_req_init(SMB2_ECHO, NULL, server,
4260 				 (void **)&req, &total_len);
4261 	if (rc)
4262 		return rc;
4263 
4264 	req->hdr.CreditRequest = cpu_to_le16(1);
4265 
4266 	iov[0].iov_len = total_len;
4267 	iov[0].iov_base = (char *)req;
4268 
4269 	rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
4270 			     server, CIFS_ECHO_OP, NULL);
4271 	if (rc)
4272 		cifs_dbg(FYI, "Echo request failed: %d\n", rc);
4273 
4274 	cifs_small_buf_release(req);
4275 	return rc;
4276 }
4277 
4278 void
SMB2_flush_free(struct smb_rqst * rqst)4279 SMB2_flush_free(struct smb_rqst *rqst)
4280 {
4281 	if (rqst && rqst->rq_iov)
4282 		cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
4283 }
4284 
4285 int
SMB2_flush_init(const unsigned int xid,struct smb_rqst * rqst,struct cifs_tcon * tcon,struct TCP_Server_Info * server,u64 persistent_fid,u64 volatile_fid)4286 SMB2_flush_init(const unsigned int xid, struct smb_rqst *rqst,
4287 		struct cifs_tcon *tcon, struct TCP_Server_Info *server,
4288 		u64 persistent_fid, u64 volatile_fid)
4289 {
4290 	struct smb2_flush_req *req;
4291 	struct kvec *iov = rqst->rq_iov;
4292 	unsigned int total_len;
4293 	int rc;
4294 
4295 	rc = smb2_plain_req_init(SMB2_FLUSH, tcon, server,
4296 				 (void **) &req, &total_len);
4297 	if (rc)
4298 		return rc;
4299 
4300 	req->PersistentFileId = persistent_fid;
4301 	req->VolatileFileId = volatile_fid;
4302 
4303 	iov[0].iov_base = (char *)req;
4304 	iov[0].iov_len = total_len;
4305 
4306 	return 0;
4307 }
4308 
4309 int
SMB2_flush(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid)4310 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
4311 	   u64 volatile_fid)
4312 {
4313 	struct cifs_ses *ses = tcon->ses;
4314 	struct smb_rqst rqst;
4315 	struct kvec iov[1];
4316 	struct kvec rsp_iov = {NULL, 0};
4317 	struct TCP_Server_Info *server;
4318 	int resp_buftype = CIFS_NO_BUFFER;
4319 	int flags = 0;
4320 	int rc = 0;
4321 	int retries = 0, cur_sleep = 1;
4322 
4323 replay_again:
4324 	/* reinitialize for possible replay */
4325 	flags = 0;
4326 	server = cifs_pick_channel(ses);
4327 
4328 	cifs_dbg(FYI, "flush\n");
4329 	if (!ses || !(ses->server))
4330 		return -EIO;
4331 
4332 	if (smb3_encryption_required(tcon))
4333 		flags |= CIFS_TRANSFORM_REQ;
4334 
4335 	memset(&rqst, 0, sizeof(struct smb_rqst));
4336 	memset(&iov, 0, sizeof(iov));
4337 	rqst.rq_iov = iov;
4338 	rqst.rq_nvec = 1;
4339 
4340 	rc = SMB2_flush_init(xid, &rqst, tcon, server,
4341 			     persistent_fid, volatile_fid);
4342 	if (rc)
4343 		goto flush_exit;
4344 
4345 	trace_smb3_flush_enter(xid, persistent_fid, tcon->tid, ses->Suid);
4346 
4347 	if (retries)
4348 		smb2_set_replay(server, &rqst);
4349 
4350 	rc = cifs_send_recv(xid, ses, server,
4351 			    &rqst, &resp_buftype, flags, &rsp_iov);
4352 
4353 	if (rc != 0) {
4354 		cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
4355 		trace_smb3_flush_err(xid, persistent_fid, tcon->tid, ses->Suid,
4356 				     rc);
4357 	} else
4358 		trace_smb3_flush_done(xid, persistent_fid, tcon->tid,
4359 				      ses->Suid);
4360 
4361  flush_exit:
4362 	SMB2_flush_free(&rqst);
4363 	free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4364 
4365 	if (is_replayable_error(rc) &&
4366 	    smb2_should_replay(tcon, &retries, &cur_sleep))
4367 		goto replay_again;
4368 
4369 	return rc;
4370 }
4371 
4372 #ifdef CONFIG_CIFS_SMB_DIRECT
smb3_use_rdma_offload(struct cifs_io_parms * io_parms)4373 static inline bool smb3_use_rdma_offload(struct cifs_io_parms *io_parms)
4374 {
4375 	struct TCP_Server_Info *server = io_parms->server;
4376 	struct cifs_tcon *tcon = io_parms->tcon;
4377 
4378 	/* we can only offload if we're connected */
4379 	if (!server || !tcon)
4380 		return false;
4381 
4382 	/* we can only offload on an rdma connection */
4383 	if (!server->rdma || !server->smbd_conn)
4384 		return false;
4385 
4386 	/* we don't support signed offload yet */
4387 	if (server->sign)
4388 		return false;
4389 
4390 	/* we don't support encrypted offload yet */
4391 	if (smb3_encryption_required(tcon))
4392 		return false;
4393 
4394 	/* offload also has its overhead, so only do it if desired */
4395 	if (io_parms->length < server->smbd_conn->rdma_readwrite_threshold)
4396 		return false;
4397 
4398 	return true;
4399 }
4400 #endif /* CONFIG_CIFS_SMB_DIRECT */
4401 
4402 /*
4403  * To form a chain of read requests, any read requests after the first should
4404  * have the end_of_chain boolean set to true.
4405  */
4406 static int
smb2_new_read_req(void ** buf,unsigned int * total_len,struct cifs_io_parms * io_parms,struct cifs_io_subrequest * rdata,unsigned int remaining_bytes,int request_type)4407 smb2_new_read_req(void **buf, unsigned int *total_len,
4408 	struct cifs_io_parms *io_parms, struct cifs_io_subrequest *rdata,
4409 	unsigned int remaining_bytes, int request_type)
4410 {
4411 	int rc = -EACCES;
4412 	struct smb2_read_req *req = NULL;
4413 	struct smb2_hdr *shdr;
4414 	struct TCP_Server_Info *server = io_parms->server;
4415 
4416 	rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, server,
4417 				 (void **) &req, total_len);
4418 	if (rc)
4419 		return rc;
4420 
4421 	if (server == NULL)
4422 		return -ECONNABORTED;
4423 
4424 	shdr = &req->hdr;
4425 	shdr->Id.SyncId.ProcessId = cpu_to_le32(io_parms->pid);
4426 
4427 	req->PersistentFileId = io_parms->persistent_fid;
4428 	req->VolatileFileId = io_parms->volatile_fid;
4429 	req->ReadChannelInfoOffset = 0; /* reserved */
4430 	req->ReadChannelInfoLength = 0; /* reserved */
4431 	req->Channel = 0; /* reserved */
4432 	req->MinimumCount = 0;
4433 	req->Length = cpu_to_le32(io_parms->length);
4434 	req->Offset = cpu_to_le64(io_parms->offset);
4435 
4436 	trace_smb3_read_enter(rdata ? rdata->rreq->debug_id : 0,
4437 			      rdata ? rdata->subreq.debug_index : 0,
4438 			      rdata ? rdata->xid : 0,
4439 			      io_parms->persistent_fid,
4440 			      io_parms->tcon->tid, io_parms->tcon->ses->Suid,
4441 			      io_parms->offset, io_parms->length);
4442 #ifdef CONFIG_CIFS_SMB_DIRECT
4443 	/*
4444 	 * If we want to do a RDMA write, fill in and append
4445 	 * smbd_buffer_descriptor_v1 to the end of read request
4446 	 */
4447 	if (rdata && smb3_use_rdma_offload(io_parms)) {
4448 		struct smbd_buffer_descriptor_v1 *v1;
4449 		bool need_invalidate = server->dialect == SMB30_PROT_ID;
4450 
4451 		rdata->mr = smbd_register_mr(server->smbd_conn, &rdata->subreq.io_iter,
4452 					     true, need_invalidate);
4453 		if (!rdata->mr)
4454 			return -EAGAIN;
4455 
4456 		req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
4457 		if (need_invalidate)
4458 			req->Channel = SMB2_CHANNEL_RDMA_V1;
4459 		req->ReadChannelInfoOffset =
4460 			cpu_to_le16(offsetof(struct smb2_read_req, Buffer));
4461 		req->ReadChannelInfoLength =
4462 			cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
4463 		v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
4464 		v1->offset = cpu_to_le64(rdata->mr->mr->iova);
4465 		v1->token = cpu_to_le32(rdata->mr->mr->rkey);
4466 		v1->length = cpu_to_le32(rdata->mr->mr->length);
4467 
4468 		*total_len += sizeof(*v1) - 1;
4469 	}
4470 #endif
4471 	if (request_type & CHAINED_REQUEST) {
4472 		if (!(request_type & END_OF_CHAIN)) {
4473 			/* next 8-byte aligned request */
4474 			*total_len = ALIGN(*total_len, 8);
4475 			shdr->NextCommand = cpu_to_le32(*total_len);
4476 		} else /* END_OF_CHAIN */
4477 			shdr->NextCommand = 0;
4478 		if (request_type & RELATED_REQUEST) {
4479 			shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
4480 			/*
4481 			 * Related requests use info from previous read request
4482 			 * in chain.
4483 			 */
4484 			shdr->SessionId = cpu_to_le64(0xFFFFFFFFFFFFFFFF);
4485 			shdr->Id.SyncId.TreeId = cpu_to_le32(0xFFFFFFFF);
4486 			req->PersistentFileId = (u64)-1;
4487 			req->VolatileFileId = (u64)-1;
4488 		}
4489 	}
4490 	if (remaining_bytes > io_parms->length)
4491 		req->RemainingBytes = cpu_to_le32(remaining_bytes);
4492 	else
4493 		req->RemainingBytes = 0;
4494 
4495 	*buf = req;
4496 	return rc;
4497 }
4498 
4499 static void
smb2_readv_callback(struct mid_q_entry * mid)4500 smb2_readv_callback(struct mid_q_entry *mid)
4501 {
4502 	struct cifs_io_subrequest *rdata = mid->callback_data;
4503 	struct netfs_inode *ictx = netfs_inode(rdata->rreq->inode);
4504 	struct cifs_tcon *tcon = tlink_tcon(rdata->req->cfile->tlink);
4505 	struct TCP_Server_Info *server = rdata->server;
4506 	struct smb2_hdr *shdr =
4507 				(struct smb2_hdr *)rdata->iov[0].iov_base;
4508 	struct cifs_credits credits = {
4509 		.value = 0,
4510 		.instance = 0,
4511 		.rreq_debug_id = rdata->rreq->debug_id,
4512 		.rreq_debug_index = rdata->subreq.debug_index,
4513 	};
4514 	struct smb_rqst rqst = { .rq_iov = &rdata->iov[1], .rq_nvec = 1 };
4515 	unsigned int rreq_debug_id = rdata->rreq->debug_id;
4516 	unsigned int subreq_debug_index = rdata->subreq.debug_index;
4517 
4518 	if (rdata->got_bytes) {
4519 		rqst.rq_iter	  = rdata->subreq.io_iter;
4520 	}
4521 
4522 	WARN_ONCE(rdata->server != mid->server,
4523 		  "rdata server %p != mid server %p",
4524 		  rdata->server, mid->server);
4525 
4526 	cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%zu/%zu\n",
4527 		 __func__, mid->mid, mid->mid_state, rdata->result,
4528 		 rdata->got_bytes, rdata->subreq.len - rdata->subreq.transferred);
4529 
4530 	switch (mid->mid_state) {
4531 	case MID_RESPONSE_RECEIVED:
4532 		credits.value = le16_to_cpu(shdr->CreditRequest);
4533 		credits.instance = server->reconnect_instance;
4534 		/* result already set, check signature */
4535 		if (server->sign && !mid->decrypted) {
4536 			int rc;
4537 
4538 			iov_iter_truncate(&rqst.rq_iter, rdata->got_bytes);
4539 			rc = smb2_verify_signature(&rqst, server);
4540 			if (rc)
4541 				cifs_tcon_dbg(VFS, "SMB signature verification returned error = %d\n",
4542 					 rc);
4543 		}
4544 		/* FIXME: should this be counted toward the initiating task? */
4545 		task_io_account_read(rdata->got_bytes);
4546 		cifs_stats_bytes_read(tcon, rdata->got_bytes);
4547 		break;
4548 	case MID_REQUEST_SUBMITTED:
4549 	case MID_RETRY_NEEDED:
4550 		__set_bit(NETFS_SREQ_NEED_RETRY, &rdata->subreq.flags);
4551 		rdata->result = -EAGAIN;
4552 		if (server->sign && rdata->got_bytes)
4553 			/* reset bytes number since we can not check a sign */
4554 			rdata->got_bytes = 0;
4555 		/* FIXME: should this be counted toward the initiating task? */
4556 		task_io_account_read(rdata->got_bytes);
4557 		cifs_stats_bytes_read(tcon, rdata->got_bytes);
4558 		break;
4559 	case MID_RESPONSE_MALFORMED:
4560 		credits.value = le16_to_cpu(shdr->CreditRequest);
4561 		credits.instance = server->reconnect_instance;
4562 		fallthrough;
4563 	default:
4564 		rdata->result = -EIO;
4565 	}
4566 #ifdef CONFIG_CIFS_SMB_DIRECT
4567 	/*
4568 	 * If this rdata has a memory registered, the MR can be freed
4569 	 * MR needs to be freed as soon as I/O finishes to prevent deadlock
4570 	 * because they have limited number and are used for future I/Os
4571 	 */
4572 	if (rdata->mr) {
4573 		smbd_deregister_mr(rdata->mr);
4574 		rdata->mr = NULL;
4575 	}
4576 #endif
4577 	if (rdata->result && rdata->result != -ENODATA) {
4578 		cifs_stats_fail_inc(tcon, SMB2_READ_HE);
4579 		trace_smb3_read_err(rdata->rreq->debug_id,
4580 				    rdata->subreq.debug_index,
4581 				    rdata->xid,
4582 				    rdata->req->cfile->fid.persistent_fid,
4583 				    tcon->tid, tcon->ses->Suid,
4584 				    rdata->subreq.start + rdata->subreq.transferred,
4585 				    rdata->subreq.len   - rdata->subreq.transferred,
4586 				    rdata->result);
4587 	} else
4588 		trace_smb3_read_done(rdata->rreq->debug_id,
4589 				     rdata->subreq.debug_index,
4590 				     rdata->xid,
4591 				     rdata->req->cfile->fid.persistent_fid,
4592 				     tcon->tid, tcon->ses->Suid,
4593 				     rdata->subreq.start + rdata->subreq.transferred,
4594 				     rdata->got_bytes);
4595 
4596 	if (rdata->result == -ENODATA) {
4597 		__set_bit(NETFS_SREQ_HIT_EOF, &rdata->subreq.flags);
4598 		rdata->result = 0;
4599 	} else {
4600 		size_t trans = rdata->subreq.transferred + rdata->got_bytes;
4601 		if (trans < rdata->subreq.len &&
4602 		    rdata->subreq.start + trans == ictx->remote_i_size) {
4603 			__set_bit(NETFS_SREQ_HIT_EOF, &rdata->subreq.flags);
4604 			rdata->result = 0;
4605 		}
4606 		if (rdata->got_bytes)
4607 			__set_bit(NETFS_SREQ_MADE_PROGRESS, &rdata->subreq.flags);
4608 	}
4609 	trace_smb3_rw_credits(rreq_debug_id, subreq_debug_index, rdata->credits.value,
4610 			      server->credits, server->in_flight,
4611 			      0, cifs_trace_rw_credits_read_response_clear);
4612 	rdata->credits.value = 0;
4613 	rdata->subreq.error = rdata->result;
4614 	rdata->subreq.transferred += rdata->got_bytes;
4615 	trace_netfs_sreq(&rdata->subreq, netfs_sreq_trace_io_progress);
4616 	netfs_read_subreq_terminated(&rdata->subreq);
4617 	release_mid(mid);
4618 	trace_smb3_rw_credits(rreq_debug_id, subreq_debug_index, 0,
4619 			      server->credits, server->in_flight,
4620 			      credits.value, cifs_trace_rw_credits_read_response_add);
4621 	add_credits(server, &credits, 0);
4622 }
4623 
4624 /* smb2_async_readv - send an async read, and set up mid to handle result */
4625 int
smb2_async_readv(struct cifs_io_subrequest * rdata)4626 smb2_async_readv(struct cifs_io_subrequest *rdata)
4627 {
4628 	int rc, flags = 0;
4629 	char *buf;
4630 	struct netfs_io_subrequest *subreq = &rdata->subreq;
4631 	struct smb2_hdr *shdr;
4632 	struct cifs_io_parms io_parms;
4633 	struct smb_rqst rqst = { .rq_iov = rdata->iov,
4634 				 .rq_nvec = 1 };
4635 	struct TCP_Server_Info *server;
4636 	struct cifs_tcon *tcon = tlink_tcon(rdata->req->cfile->tlink);
4637 	unsigned int total_len;
4638 	int credit_request;
4639 
4640 	cifs_dbg(FYI, "%s: offset=%llu bytes=%zu\n",
4641 		 __func__, subreq->start, subreq->len);
4642 
4643 	if (!rdata->server)
4644 		rdata->server = cifs_pick_channel(tcon->ses);
4645 
4646 	io_parms.tcon = tlink_tcon(rdata->req->cfile->tlink);
4647 	io_parms.server = server = rdata->server;
4648 	io_parms.offset = subreq->start + subreq->transferred;
4649 	io_parms.length = subreq->len   - subreq->transferred;
4650 	io_parms.persistent_fid = rdata->req->cfile->fid.persistent_fid;
4651 	io_parms.volatile_fid = rdata->req->cfile->fid.volatile_fid;
4652 	io_parms.pid = rdata->req->pid;
4653 
4654 	rc = smb2_new_read_req(
4655 		(void **) &buf, &total_len, &io_parms, rdata, 0, 0);
4656 	if (rc)
4657 		return rc;
4658 
4659 	if (smb3_encryption_required(io_parms.tcon))
4660 		flags |= CIFS_TRANSFORM_REQ;
4661 
4662 	rdata->iov[0].iov_base = buf;
4663 	rdata->iov[0].iov_len = total_len;
4664 	rdata->got_bytes = 0;
4665 	rdata->result = 0;
4666 
4667 	shdr = (struct smb2_hdr *)buf;
4668 
4669 	if (rdata->credits.value > 0) {
4670 		shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(io_parms.length,
4671 						SMB2_MAX_BUFFER_SIZE));
4672 		credit_request = le16_to_cpu(shdr->CreditCharge) + 8;
4673 		if (server->credits >= server->max_credits)
4674 			shdr->CreditRequest = cpu_to_le16(0);
4675 		else
4676 			shdr->CreditRequest = cpu_to_le16(
4677 				min_t(int, server->max_credits -
4678 						server->credits, credit_request));
4679 
4680 		rc = adjust_credits(server, rdata, cifs_trace_rw_credits_call_readv_adjust);
4681 		if (rc)
4682 			goto async_readv_out;
4683 
4684 		flags |= CIFS_HAS_CREDITS;
4685 	}
4686 
4687 	rc = cifs_call_async(server, &rqst,
4688 			     cifs_readv_receive, smb2_readv_callback,
4689 			     smb3_handle_read_data, rdata, flags,
4690 			     &rdata->credits);
4691 	if (rc) {
4692 		cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
4693 		trace_smb3_read_err(rdata->rreq->debug_id,
4694 				    subreq->debug_index,
4695 				    rdata->xid, io_parms.persistent_fid,
4696 				    io_parms.tcon->tid,
4697 				    io_parms.tcon->ses->Suid,
4698 				    io_parms.offset,
4699 				    subreq->len - subreq->transferred, rc);
4700 	}
4701 
4702 async_readv_out:
4703 	cifs_small_buf_release(buf);
4704 	return rc;
4705 }
4706 
4707 int
SMB2_read(const unsigned int xid,struct cifs_io_parms * io_parms,unsigned int * nbytes,char ** buf,int * buf_type)4708 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
4709 	  unsigned int *nbytes, char **buf, int *buf_type)
4710 {
4711 	struct smb_rqst rqst;
4712 	int resp_buftype, rc;
4713 	struct smb2_read_req *req = NULL;
4714 	struct smb2_read_rsp *rsp = NULL;
4715 	struct kvec iov[1];
4716 	struct kvec rsp_iov;
4717 	unsigned int total_len;
4718 	int flags = CIFS_LOG_ERROR;
4719 	struct cifs_ses *ses = io_parms->tcon->ses;
4720 
4721 	if (!io_parms->server)
4722 		io_parms->server = cifs_pick_channel(io_parms->tcon->ses);
4723 
4724 	*nbytes = 0;
4725 	rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0);
4726 	if (rc)
4727 		return rc;
4728 
4729 	if (smb3_encryption_required(io_parms->tcon))
4730 		flags |= CIFS_TRANSFORM_REQ;
4731 
4732 	iov[0].iov_base = (char *)req;
4733 	iov[0].iov_len = total_len;
4734 
4735 	memset(&rqst, 0, sizeof(struct smb_rqst));
4736 	rqst.rq_iov = iov;
4737 	rqst.rq_nvec = 1;
4738 
4739 	rc = cifs_send_recv(xid, ses, io_parms->server,
4740 			    &rqst, &resp_buftype, flags, &rsp_iov);
4741 	rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
4742 
4743 	if (rc) {
4744 		if (rc != -ENODATA) {
4745 			cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
4746 			cifs_dbg(VFS, "Send error in read = %d\n", rc);
4747 			trace_smb3_read_err(0, 0, xid,
4748 					    req->PersistentFileId,
4749 					    io_parms->tcon->tid, ses->Suid,
4750 					    io_parms->offset, io_parms->length,
4751 					    rc);
4752 		} else
4753 			trace_smb3_read_done(0, 0, xid,
4754 					     req->PersistentFileId, io_parms->tcon->tid,
4755 					     ses->Suid, io_parms->offset, 0);
4756 		free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4757 		cifs_small_buf_release(req);
4758 		return rc == -ENODATA ? 0 : rc;
4759 	} else
4760 		trace_smb3_read_done(0, 0, xid,
4761 				     req->PersistentFileId,
4762 				     io_parms->tcon->tid, ses->Suid,
4763 				     io_parms->offset, io_parms->length);
4764 
4765 	cifs_small_buf_release(req);
4766 
4767 	*nbytes = le32_to_cpu(rsp->DataLength);
4768 	if ((*nbytes > CIFS_MAX_MSGSIZE) ||
4769 	    (*nbytes > io_parms->length)) {
4770 		cifs_dbg(FYI, "bad length %d for count %d\n",
4771 			 *nbytes, io_parms->length);
4772 		rc = -EIO;
4773 		*nbytes = 0;
4774 	}
4775 
4776 	if (*buf) {
4777 		memcpy(*buf, (char *)rsp + rsp->DataOffset, *nbytes);
4778 		free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4779 	} else if (resp_buftype != CIFS_NO_BUFFER) {
4780 		*buf = rsp_iov.iov_base;
4781 		if (resp_buftype == CIFS_SMALL_BUFFER)
4782 			*buf_type = CIFS_SMALL_BUFFER;
4783 		else if (resp_buftype == CIFS_LARGE_BUFFER)
4784 			*buf_type = CIFS_LARGE_BUFFER;
4785 	}
4786 	return rc;
4787 }
4788 
4789 /*
4790  * Check the mid_state and signature on received buffer (if any), and queue the
4791  * workqueue completion task.
4792  */
4793 static void
smb2_writev_callback(struct mid_q_entry * mid)4794 smb2_writev_callback(struct mid_q_entry *mid)
4795 {
4796 	struct cifs_io_subrequest *wdata = mid->callback_data;
4797 	struct cifs_tcon *tcon = tlink_tcon(wdata->req->cfile->tlink);
4798 	struct TCP_Server_Info *server = wdata->server;
4799 	struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
4800 	struct cifs_credits credits = {
4801 		.value = 0,
4802 		.instance = 0,
4803 		.rreq_debug_id = wdata->rreq->debug_id,
4804 		.rreq_debug_index = wdata->subreq.debug_index,
4805 	};
4806 	unsigned int rreq_debug_id = wdata->rreq->debug_id;
4807 	unsigned int subreq_debug_index = wdata->subreq.debug_index;
4808 	ssize_t result = 0;
4809 	size_t written;
4810 
4811 	WARN_ONCE(wdata->server != mid->server,
4812 		  "wdata server %p != mid server %p",
4813 		  wdata->server, mid->server);
4814 
4815 	switch (mid->mid_state) {
4816 	case MID_RESPONSE_RECEIVED:
4817 		credits.value = le16_to_cpu(rsp->hdr.CreditRequest);
4818 		credits.instance = server->reconnect_instance;
4819 		result = smb2_check_receive(mid, server, 0);
4820 		if (result != 0)
4821 			break;
4822 
4823 		written = le32_to_cpu(rsp->DataLength);
4824 		/*
4825 		 * Mask off high 16 bits when bytes written as returned
4826 		 * by the server is greater than bytes requested by the
4827 		 * client. OS/2 servers are known to set incorrect
4828 		 * CountHigh values.
4829 		 */
4830 		if (written > wdata->subreq.len)
4831 			written &= 0xFFFF;
4832 
4833 		cifs_stats_bytes_written(tcon, written);
4834 
4835 		if (written < wdata->subreq.len) {
4836 			wdata->result = -ENOSPC;
4837 		} else if (written > 0) {
4838 			wdata->subreq.len = written;
4839 			__set_bit(NETFS_SREQ_MADE_PROGRESS, &wdata->subreq.flags);
4840 		}
4841 		break;
4842 	case MID_REQUEST_SUBMITTED:
4843 	case MID_RETRY_NEEDED:
4844 		result = -EAGAIN;
4845 		break;
4846 	case MID_RESPONSE_MALFORMED:
4847 		credits.value = le16_to_cpu(rsp->hdr.CreditRequest);
4848 		credits.instance = server->reconnect_instance;
4849 		fallthrough;
4850 	default:
4851 		result = -EIO;
4852 		break;
4853 	}
4854 #ifdef CONFIG_CIFS_SMB_DIRECT
4855 	/*
4856 	 * If this wdata has a memory registered, the MR can be freed
4857 	 * The number of MRs available is limited, it's important to recover
4858 	 * used MR as soon as I/O is finished. Hold MR longer in the later
4859 	 * I/O process can possibly result in I/O deadlock due to lack of MR
4860 	 * to send request on I/O retry
4861 	 */
4862 	if (wdata->mr) {
4863 		smbd_deregister_mr(wdata->mr);
4864 		wdata->mr = NULL;
4865 	}
4866 #endif
4867 	if (result) {
4868 		cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
4869 		trace_smb3_write_err(wdata->rreq->debug_id,
4870 				     wdata->subreq.debug_index,
4871 				     wdata->xid,
4872 				     wdata->req->cfile->fid.persistent_fid,
4873 				     tcon->tid, tcon->ses->Suid, wdata->subreq.start,
4874 				     wdata->subreq.len, wdata->result);
4875 		if (wdata->result == -ENOSPC)
4876 			pr_warn_once("Out of space writing to %s\n",
4877 				     tcon->tree_name);
4878 	} else
4879 		trace_smb3_write_done(wdata->rreq->debug_id,
4880 				      wdata->subreq.debug_index,
4881 				      wdata->xid,
4882 				      wdata->req->cfile->fid.persistent_fid,
4883 				      tcon->tid, tcon->ses->Suid,
4884 				      wdata->subreq.start, wdata->subreq.len);
4885 
4886 	trace_smb3_rw_credits(rreq_debug_id, subreq_debug_index, wdata->credits.value,
4887 			      server->credits, server->in_flight,
4888 			      0, cifs_trace_rw_credits_write_response_clear);
4889 	wdata->credits.value = 0;
4890 	trace_netfs_sreq(&wdata->subreq, netfs_sreq_trace_io_progress);
4891 	cifs_write_subrequest_terminated(wdata, result ?: written, true);
4892 	release_mid(mid);
4893 	trace_smb3_rw_credits(rreq_debug_id, subreq_debug_index, 0,
4894 			      server->credits, server->in_flight,
4895 			      credits.value, cifs_trace_rw_credits_write_response_add);
4896 	add_credits(server, &credits, 0);
4897 }
4898 
4899 /* smb2_async_writev - send an async write, and set up mid to handle result */
4900 void
smb2_async_writev(struct cifs_io_subrequest * wdata)4901 smb2_async_writev(struct cifs_io_subrequest *wdata)
4902 {
4903 	int rc = -EACCES, flags = 0;
4904 	struct smb2_write_req *req = NULL;
4905 	struct smb2_hdr *shdr;
4906 	struct cifs_tcon *tcon = tlink_tcon(wdata->req->cfile->tlink);
4907 	struct TCP_Server_Info *server = wdata->server;
4908 	struct kvec iov[1];
4909 	struct smb_rqst rqst = { };
4910 	unsigned int total_len, xid = wdata->xid;
4911 	struct cifs_io_parms _io_parms;
4912 	struct cifs_io_parms *io_parms = NULL;
4913 	int credit_request;
4914 
4915 	/*
4916 	 * in future we may get cifs_io_parms passed in from the caller,
4917 	 * but for now we construct it here...
4918 	 */
4919 	_io_parms = (struct cifs_io_parms) {
4920 		.tcon = tcon,
4921 		.server = server,
4922 		.offset = wdata->subreq.start,
4923 		.length = wdata->subreq.len,
4924 		.persistent_fid = wdata->req->cfile->fid.persistent_fid,
4925 		.volatile_fid = wdata->req->cfile->fid.volatile_fid,
4926 		.pid = wdata->req->pid,
4927 	};
4928 	io_parms = &_io_parms;
4929 
4930 	rc = smb2_plain_req_init(SMB2_WRITE, tcon, server,
4931 				 (void **) &req, &total_len);
4932 	if (rc)
4933 		goto out;
4934 
4935 	rqst.rq_iov = iov;
4936 	rqst.rq_iter = wdata->subreq.io_iter;
4937 
4938 	rqst.rq_iov[0].iov_len = total_len - 1;
4939 	rqst.rq_iov[0].iov_base = (char *)req;
4940 	rqst.rq_nvec += 1;
4941 
4942 	if (smb3_encryption_required(tcon))
4943 		flags |= CIFS_TRANSFORM_REQ;
4944 
4945 	shdr = (struct smb2_hdr *)req;
4946 	shdr->Id.SyncId.ProcessId = cpu_to_le32(io_parms->pid);
4947 
4948 	req->PersistentFileId = io_parms->persistent_fid;
4949 	req->VolatileFileId = io_parms->volatile_fid;
4950 	req->WriteChannelInfoOffset = 0;
4951 	req->WriteChannelInfoLength = 0;
4952 	req->Channel = SMB2_CHANNEL_NONE;
4953 	req->Length = cpu_to_le32(io_parms->length);
4954 	req->Offset = cpu_to_le64(io_parms->offset);
4955 	req->DataOffset = cpu_to_le16(
4956 				offsetof(struct smb2_write_req, Buffer));
4957 	req->RemainingBytes = 0;
4958 
4959 	trace_smb3_write_enter(wdata->rreq->debug_id,
4960 			       wdata->subreq.debug_index,
4961 			       wdata->xid,
4962 			       io_parms->persistent_fid,
4963 			       io_parms->tcon->tid,
4964 			       io_parms->tcon->ses->Suid,
4965 			       io_parms->offset,
4966 			       io_parms->length);
4967 
4968 #ifdef CONFIG_CIFS_SMB_DIRECT
4969 	/*
4970 	 * If we want to do a server RDMA read, fill in and append
4971 	 * smbd_buffer_descriptor_v1 to the end of write request
4972 	 */
4973 	if (smb3_use_rdma_offload(io_parms)) {
4974 		struct smbd_buffer_descriptor_v1 *v1;
4975 		bool need_invalidate = server->dialect == SMB30_PROT_ID;
4976 
4977 		wdata->mr = smbd_register_mr(server->smbd_conn, &wdata->subreq.io_iter,
4978 					     false, need_invalidate);
4979 		if (!wdata->mr) {
4980 			rc = -EAGAIN;
4981 			goto async_writev_out;
4982 		}
4983 		/* For RDMA read, I/O size is in RemainingBytes not in Length */
4984 		req->RemainingBytes = req->Length;
4985 		req->Length = 0;
4986 		req->DataOffset = 0;
4987 		req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
4988 		if (need_invalidate)
4989 			req->Channel = SMB2_CHANNEL_RDMA_V1;
4990 		req->WriteChannelInfoOffset =
4991 			cpu_to_le16(offsetof(struct smb2_write_req, Buffer));
4992 		req->WriteChannelInfoLength =
4993 			cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
4994 		v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
4995 		v1->offset = cpu_to_le64(wdata->mr->mr->iova);
4996 		v1->token = cpu_to_le32(wdata->mr->mr->rkey);
4997 		v1->length = cpu_to_le32(wdata->mr->mr->length);
4998 
4999 		rqst.rq_iov[0].iov_len += sizeof(*v1);
5000 
5001 		/*
5002 		 * We keep wdata->subreq.io_iter,
5003 		 * but we have to truncate rqst.rq_iter
5004 		 */
5005 		iov_iter_truncate(&rqst.rq_iter, 0);
5006 	}
5007 #endif
5008 
5009 	if (wdata->subreq.retry_count > 0)
5010 		smb2_set_replay(server, &rqst);
5011 
5012 	cifs_dbg(FYI, "async write at %llu %u bytes iter=%zx\n",
5013 		 io_parms->offset, io_parms->length, iov_iter_count(&wdata->subreq.io_iter));
5014 
5015 	if (wdata->credits.value > 0) {
5016 		shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->subreq.len,
5017 						    SMB2_MAX_BUFFER_SIZE));
5018 		credit_request = le16_to_cpu(shdr->CreditCharge) + 8;
5019 		if (server->credits >= server->max_credits)
5020 			shdr->CreditRequest = cpu_to_le16(0);
5021 		else
5022 			shdr->CreditRequest = cpu_to_le16(
5023 				min_t(int, server->max_credits -
5024 						server->credits, credit_request));
5025 
5026 		rc = adjust_credits(server, wdata, cifs_trace_rw_credits_call_writev_adjust);
5027 		if (rc)
5028 			goto async_writev_out;
5029 
5030 		flags |= CIFS_HAS_CREDITS;
5031 	}
5032 
5033 	/* XXX: compression + encryption is unsupported for now */
5034 	if (((flags & CIFS_TRANSFORM_REQ) != CIFS_TRANSFORM_REQ) && should_compress(tcon, &rqst))
5035 		flags |= CIFS_COMPRESS_REQ;
5036 
5037 	rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
5038 			     wdata, flags, &wdata->credits);
5039 	/* Can't touch wdata if rc == 0 */
5040 	if (rc) {
5041 		trace_smb3_write_err(wdata->rreq->debug_id,
5042 				     wdata->subreq.debug_index,
5043 				     xid,
5044 				     io_parms->persistent_fid,
5045 				     io_parms->tcon->tid,
5046 				     io_parms->tcon->ses->Suid,
5047 				     io_parms->offset,
5048 				     io_parms->length,
5049 				     rc);
5050 		cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
5051 	}
5052 
5053 async_writev_out:
5054 	cifs_small_buf_release(req);
5055 out:
5056 	if (rc) {
5057 		trace_smb3_rw_credits(wdata->rreq->debug_id,
5058 				      wdata->subreq.debug_index,
5059 				      wdata->credits.value,
5060 				      server->credits, server->in_flight,
5061 				      -(int)wdata->credits.value,
5062 				      cifs_trace_rw_credits_write_response_clear);
5063 		add_credits_and_wake_if(wdata->server, &wdata->credits, 0);
5064 		cifs_write_subrequest_terminated(wdata, rc, true);
5065 	}
5066 }
5067 
5068 /*
5069  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
5070  * The length field from io_parms must be at least 1 and indicates a number of
5071  * elements with data to write that begins with position 1 in iov array. All
5072  * data length is specified by count.
5073  */
5074 int
SMB2_write(const unsigned int xid,struct cifs_io_parms * io_parms,unsigned int * nbytes,struct kvec * iov,int n_vec)5075 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
5076 	   unsigned int *nbytes, struct kvec *iov, int n_vec)
5077 {
5078 	struct smb_rqst rqst;
5079 	int rc = 0;
5080 	struct smb2_write_req *req = NULL;
5081 	struct smb2_write_rsp *rsp = NULL;
5082 	int resp_buftype;
5083 	struct kvec rsp_iov;
5084 	int flags = 0;
5085 	unsigned int total_len;
5086 	struct TCP_Server_Info *server;
5087 	int retries = 0, cur_sleep = 1;
5088 
5089 replay_again:
5090 	/* reinitialize for possible replay */
5091 	flags = 0;
5092 	*nbytes = 0;
5093 	if (!io_parms->server)
5094 		io_parms->server = cifs_pick_channel(io_parms->tcon->ses);
5095 	server = io_parms->server;
5096 	if (server == NULL)
5097 		return -ECONNABORTED;
5098 
5099 	if (n_vec < 1)
5100 		return rc;
5101 
5102 	rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, server,
5103 				 (void **) &req, &total_len);
5104 	if (rc)
5105 		return rc;
5106 
5107 	if (smb3_encryption_required(io_parms->tcon))
5108 		flags |= CIFS_TRANSFORM_REQ;
5109 
5110 	req->hdr.Id.SyncId.ProcessId = cpu_to_le32(io_parms->pid);
5111 
5112 	req->PersistentFileId = io_parms->persistent_fid;
5113 	req->VolatileFileId = io_parms->volatile_fid;
5114 	req->WriteChannelInfoOffset = 0;
5115 	req->WriteChannelInfoLength = 0;
5116 	req->Channel = 0;
5117 	req->Length = cpu_to_le32(io_parms->length);
5118 	req->Offset = cpu_to_le64(io_parms->offset);
5119 	req->DataOffset = cpu_to_le16(
5120 				offsetof(struct smb2_write_req, Buffer));
5121 	req->RemainingBytes = 0;
5122 
5123 	trace_smb3_write_enter(0, 0, xid, io_parms->persistent_fid,
5124 		io_parms->tcon->tid, io_parms->tcon->ses->Suid,
5125 		io_parms->offset, io_parms->length);
5126 
5127 	iov[0].iov_base = (char *)req;
5128 	/* 1 for Buffer */
5129 	iov[0].iov_len = total_len - 1;
5130 
5131 	memset(&rqst, 0, sizeof(struct smb_rqst));
5132 	rqst.rq_iov = iov;
5133 	rqst.rq_nvec = n_vec + 1;
5134 
5135 	if (retries)
5136 		smb2_set_replay(server, &rqst);
5137 
5138 	rc = cifs_send_recv(xid, io_parms->tcon->ses, server,
5139 			    &rqst,
5140 			    &resp_buftype, flags, &rsp_iov);
5141 	rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
5142 
5143 	if (rc) {
5144 		trace_smb3_write_err(0, 0, xid,
5145 				     req->PersistentFileId,
5146 				     io_parms->tcon->tid,
5147 				     io_parms->tcon->ses->Suid,
5148 				     io_parms->offset, io_parms->length, rc);
5149 		cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
5150 		cifs_dbg(VFS, "Send error in write = %d\n", rc);
5151 	} else {
5152 		*nbytes = le32_to_cpu(rsp->DataLength);
5153 		cifs_stats_bytes_written(io_parms->tcon, *nbytes);
5154 		trace_smb3_write_done(0, 0, xid,
5155 				      req->PersistentFileId,
5156 				      io_parms->tcon->tid,
5157 				      io_parms->tcon->ses->Suid,
5158 				      io_parms->offset, *nbytes);
5159 	}
5160 
5161 	cifs_small_buf_release(req);
5162 	free_rsp_buf(resp_buftype, rsp);
5163 
5164 	if (is_replayable_error(rc) &&
5165 	    smb2_should_replay(io_parms->tcon, &retries, &cur_sleep))
5166 		goto replay_again;
5167 
5168 	return rc;
5169 }
5170 
posix_info_sid_size(const void * beg,const void * end)5171 int posix_info_sid_size(const void *beg, const void *end)
5172 {
5173 	size_t subauth;
5174 	int total;
5175 
5176 	if (beg + 1 > end)
5177 		return -1;
5178 
5179 	subauth = *(u8 *)(beg+1);
5180 	if (subauth < 1 || subauth > 15)
5181 		return -1;
5182 
5183 	total = 1 + 1 + 6 + 4*subauth;
5184 	if (beg + total > end)
5185 		return -1;
5186 
5187 	return total;
5188 }
5189 
posix_info_parse(const void * beg,const void * end,struct smb2_posix_info_parsed * out)5190 int posix_info_parse(const void *beg, const void *end,
5191 		     struct smb2_posix_info_parsed *out)
5192 
5193 {
5194 	int total_len = 0;
5195 	int owner_len, group_len;
5196 	int name_len;
5197 	const void *owner_sid;
5198 	const void *group_sid;
5199 	const void *name;
5200 
5201 	/* if no end bound given, assume payload to be correct */
5202 	if (!end) {
5203 		const struct smb2_posix_info *p = beg;
5204 
5205 		end = beg + le32_to_cpu(p->NextEntryOffset);
5206 		/* last element will have a 0 offset, pick a sensible bound */
5207 		if (end == beg)
5208 			end += 0xFFFF;
5209 	}
5210 
5211 	/* check base buf */
5212 	if (beg + sizeof(struct smb2_posix_info) > end)
5213 		return -1;
5214 	total_len = sizeof(struct smb2_posix_info);
5215 
5216 	/* check owner sid */
5217 	owner_sid = beg + total_len;
5218 	owner_len = posix_info_sid_size(owner_sid, end);
5219 	if (owner_len < 0)
5220 		return -1;
5221 	total_len += owner_len;
5222 
5223 	/* check group sid */
5224 	group_sid = beg + total_len;
5225 	group_len = posix_info_sid_size(group_sid, end);
5226 	if (group_len < 0)
5227 		return -1;
5228 	total_len += group_len;
5229 
5230 	/* check name len */
5231 	if (beg + total_len + 4 > end)
5232 		return -1;
5233 	name_len = le32_to_cpu(*(__le32 *)(beg + total_len));
5234 	if (name_len < 1 || name_len > 0xFFFF)
5235 		return -1;
5236 	total_len += 4;
5237 
5238 	/* check name */
5239 	name = beg + total_len;
5240 	if (name + name_len > end)
5241 		return -1;
5242 	total_len += name_len;
5243 
5244 	if (out) {
5245 		out->base = beg;
5246 		out->size = total_len;
5247 		out->name_len = name_len;
5248 		out->name = name;
5249 		memcpy(&out->owner, owner_sid, owner_len);
5250 		memcpy(&out->group, group_sid, group_len);
5251 	}
5252 	return total_len;
5253 }
5254 
posix_info_extra_size(const void * beg,const void * end)5255 static int posix_info_extra_size(const void *beg, const void *end)
5256 {
5257 	int len = posix_info_parse(beg, end, NULL);
5258 
5259 	if (len < 0)
5260 		return -1;
5261 	return len - sizeof(struct smb2_posix_info);
5262 }
5263 
5264 static unsigned int
num_entries(int infotype,char * bufstart,char * end_of_buf,char ** lastentry,size_t size)5265 num_entries(int infotype, char *bufstart, char *end_of_buf, char **lastentry,
5266 	    size_t size)
5267 {
5268 	int len;
5269 	unsigned int entrycount = 0;
5270 	unsigned int next_offset = 0;
5271 	char *entryptr;
5272 	FILE_DIRECTORY_INFO *dir_info;
5273 
5274 	if (bufstart == NULL)
5275 		return 0;
5276 
5277 	entryptr = bufstart;
5278 
5279 	while (1) {
5280 		if (entryptr + next_offset < entryptr ||
5281 		    entryptr + next_offset > end_of_buf ||
5282 		    entryptr + next_offset + size > end_of_buf) {
5283 			cifs_dbg(VFS, "malformed search entry would overflow\n");
5284 			break;
5285 		}
5286 
5287 		entryptr = entryptr + next_offset;
5288 		dir_info = (FILE_DIRECTORY_INFO *)entryptr;
5289 
5290 		if (infotype == SMB_FIND_FILE_POSIX_INFO)
5291 			len = posix_info_extra_size(entryptr, end_of_buf);
5292 		else
5293 			len = le32_to_cpu(dir_info->FileNameLength);
5294 
5295 		if (len < 0 ||
5296 		    entryptr + len < entryptr ||
5297 		    entryptr + len > end_of_buf ||
5298 		    entryptr + len + size > end_of_buf) {
5299 			cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
5300 				 end_of_buf);
5301 			break;
5302 		}
5303 
5304 		*lastentry = entryptr;
5305 		entrycount++;
5306 
5307 		next_offset = le32_to_cpu(dir_info->NextEntryOffset);
5308 		if (!next_offset)
5309 			break;
5310 	}
5311 
5312 	return entrycount;
5313 }
5314 
5315 /*
5316  * Readdir/FindFirst
5317  */
SMB2_query_directory_init(const unsigned int xid,struct cifs_tcon * tcon,struct TCP_Server_Info * server,struct smb_rqst * rqst,u64 persistent_fid,u64 volatile_fid,int index,int info_level)5318 int SMB2_query_directory_init(const unsigned int xid,
5319 			      struct cifs_tcon *tcon,
5320 			      struct TCP_Server_Info *server,
5321 			      struct smb_rqst *rqst,
5322 			      u64 persistent_fid, u64 volatile_fid,
5323 			      int index, int info_level)
5324 {
5325 	struct smb2_query_directory_req *req;
5326 	unsigned char *bufptr;
5327 	__le16 asteriks = cpu_to_le16('*');
5328 	unsigned int output_size = CIFSMaxBufSize -
5329 		MAX_SMB2_CREATE_RESPONSE_SIZE -
5330 		MAX_SMB2_CLOSE_RESPONSE_SIZE;
5331 	unsigned int total_len;
5332 	struct kvec *iov = rqst->rq_iov;
5333 	int len, rc;
5334 
5335 	rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, server,
5336 				 (void **) &req, &total_len);
5337 	if (rc)
5338 		return rc;
5339 
5340 	switch (info_level) {
5341 	case SMB_FIND_FILE_DIRECTORY_INFO:
5342 		req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
5343 		break;
5344 	case SMB_FIND_FILE_ID_FULL_DIR_INFO:
5345 		req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
5346 		break;
5347 	case SMB_FIND_FILE_POSIX_INFO:
5348 		req->FileInformationClass = SMB_FIND_FILE_POSIX_INFO;
5349 		break;
5350 	case SMB_FIND_FILE_FULL_DIRECTORY_INFO:
5351 		req->FileInformationClass = FILE_FULL_DIRECTORY_INFORMATION;
5352 		break;
5353 	default:
5354 		cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
5355 			info_level);
5356 		return -EINVAL;
5357 	}
5358 
5359 	req->FileIndex = cpu_to_le32(index);
5360 	req->PersistentFileId = persistent_fid;
5361 	req->VolatileFileId = volatile_fid;
5362 
5363 	len = 0x2;
5364 	bufptr = req->Buffer;
5365 	memcpy(bufptr, &asteriks, len);
5366 
5367 	req->FileNameOffset =
5368 		cpu_to_le16(sizeof(struct smb2_query_directory_req));
5369 	req->FileNameLength = cpu_to_le16(len);
5370 	/*
5371 	 * BB could be 30 bytes or so longer if we used SMB2 specific
5372 	 * buffer lengths, but this is safe and close enough.
5373 	 */
5374 	output_size = min_t(unsigned int, output_size, server->maxBuf);
5375 	output_size = min_t(unsigned int, output_size, 2 << 15);
5376 	req->OutputBufferLength = cpu_to_le32(output_size);
5377 
5378 	iov[0].iov_base = (char *)req;
5379 	/* 1 for Buffer */
5380 	iov[0].iov_len = total_len - 1;
5381 
5382 	iov[1].iov_base = (char *)(req->Buffer);
5383 	iov[1].iov_len = len;
5384 
5385 	trace_smb3_query_dir_enter(xid, persistent_fid, tcon->tid,
5386 			tcon->ses->Suid, index, output_size);
5387 
5388 	return 0;
5389 }
5390 
SMB2_query_directory_free(struct smb_rqst * rqst)5391 void SMB2_query_directory_free(struct smb_rqst *rqst)
5392 {
5393 	if (rqst && rqst->rq_iov) {
5394 		cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
5395 	}
5396 }
5397 
5398 int
smb2_parse_query_directory(struct cifs_tcon * tcon,struct kvec * rsp_iov,int resp_buftype,struct cifs_search_info * srch_inf)5399 smb2_parse_query_directory(struct cifs_tcon *tcon,
5400 			   struct kvec *rsp_iov,
5401 			   int resp_buftype,
5402 			   struct cifs_search_info *srch_inf)
5403 {
5404 	struct smb2_query_directory_rsp *rsp;
5405 	size_t info_buf_size;
5406 	char *end_of_smb;
5407 	int rc;
5408 
5409 	rsp = (struct smb2_query_directory_rsp *)rsp_iov->iov_base;
5410 
5411 	switch (srch_inf->info_level) {
5412 	case SMB_FIND_FILE_DIRECTORY_INFO:
5413 		info_buf_size = sizeof(FILE_DIRECTORY_INFO);
5414 		break;
5415 	case SMB_FIND_FILE_ID_FULL_DIR_INFO:
5416 		info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO);
5417 		break;
5418 	case SMB_FIND_FILE_POSIX_INFO:
5419 		/* note that posix payload are variable size */
5420 		info_buf_size = sizeof(struct smb2_posix_info);
5421 		break;
5422 	case SMB_FIND_FILE_FULL_DIRECTORY_INFO:
5423 		info_buf_size = sizeof(FILE_FULL_DIRECTORY_INFO);
5424 		break;
5425 	default:
5426 		cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
5427 			 srch_inf->info_level);
5428 		return -EINVAL;
5429 	}
5430 
5431 	rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
5432 			       le32_to_cpu(rsp->OutputBufferLength), rsp_iov,
5433 			       info_buf_size);
5434 	if (rc) {
5435 		cifs_tcon_dbg(VFS, "bad info payload");
5436 		return rc;
5437 	}
5438 
5439 	srch_inf->unicode = true;
5440 
5441 	if (srch_inf->ntwrk_buf_start) {
5442 		if (srch_inf->smallBuf)
5443 			cifs_small_buf_release(srch_inf->ntwrk_buf_start);
5444 		else
5445 			cifs_buf_release(srch_inf->ntwrk_buf_start);
5446 	}
5447 	srch_inf->ntwrk_buf_start = (char *)rsp;
5448 	srch_inf->srch_entries_start = srch_inf->last_entry =
5449 		(char *)rsp + le16_to_cpu(rsp->OutputBufferOffset);
5450 	end_of_smb = rsp_iov->iov_len + (char *)rsp;
5451 
5452 	srch_inf->entries_in_buffer = num_entries(
5453 		srch_inf->info_level,
5454 		srch_inf->srch_entries_start,
5455 		end_of_smb,
5456 		&srch_inf->last_entry,
5457 		info_buf_size);
5458 
5459 	srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
5460 	cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
5461 		 srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
5462 		 srch_inf->srch_entries_start, srch_inf->last_entry);
5463 	if (resp_buftype == CIFS_LARGE_BUFFER)
5464 		srch_inf->smallBuf = false;
5465 	else if (resp_buftype == CIFS_SMALL_BUFFER)
5466 		srch_inf->smallBuf = true;
5467 	else
5468 		cifs_tcon_dbg(VFS, "Invalid search buffer type\n");
5469 
5470 	return 0;
5471 }
5472 
5473 int
SMB2_query_directory(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid,int index,struct cifs_search_info * srch_inf)5474 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
5475 		     u64 persistent_fid, u64 volatile_fid, int index,
5476 		     struct cifs_search_info *srch_inf)
5477 {
5478 	struct smb_rqst rqst;
5479 	struct kvec iov[SMB2_QUERY_DIRECTORY_IOV_SIZE];
5480 	struct smb2_query_directory_rsp *rsp = NULL;
5481 	int resp_buftype = CIFS_NO_BUFFER;
5482 	struct kvec rsp_iov;
5483 	int rc = 0;
5484 	struct cifs_ses *ses = tcon->ses;
5485 	struct TCP_Server_Info *server;
5486 	int flags = 0;
5487 	int retries = 0, cur_sleep = 1;
5488 
5489 replay_again:
5490 	/* reinitialize for possible replay */
5491 	flags = 0;
5492 	server = cifs_pick_channel(ses);
5493 
5494 	if (!ses || !(ses->server))
5495 		return -EIO;
5496 
5497 	if (smb3_encryption_required(tcon))
5498 		flags |= CIFS_TRANSFORM_REQ;
5499 
5500 	memset(&rqst, 0, sizeof(struct smb_rqst));
5501 	memset(&iov, 0, sizeof(iov));
5502 	rqst.rq_iov = iov;
5503 	rqst.rq_nvec = SMB2_QUERY_DIRECTORY_IOV_SIZE;
5504 
5505 	rc = SMB2_query_directory_init(xid, tcon, server,
5506 				       &rqst, persistent_fid,
5507 				       volatile_fid, index,
5508 				       srch_inf->info_level);
5509 	if (rc)
5510 		goto qdir_exit;
5511 
5512 	if (retries)
5513 		smb2_set_replay(server, &rqst);
5514 
5515 	rc = cifs_send_recv(xid, ses, server,
5516 			    &rqst, &resp_buftype, flags, &rsp_iov);
5517 	rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
5518 
5519 	if (rc) {
5520 		if (rc == -ENODATA &&
5521 		    rsp->hdr.Status == STATUS_NO_MORE_FILES) {
5522 			trace_smb3_query_dir_done(xid, persistent_fid,
5523 				tcon->tid, tcon->ses->Suid, index, 0);
5524 			srch_inf->endOfSearch = true;
5525 			rc = 0;
5526 		} else {
5527 			trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
5528 				tcon->ses->Suid, index, 0, rc);
5529 			cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
5530 		}
5531 		goto qdir_exit;
5532 	}
5533 
5534 	rc = smb2_parse_query_directory(tcon, &rsp_iov,	resp_buftype,
5535 					srch_inf);
5536 	if (rc) {
5537 		trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
5538 			tcon->ses->Suid, index, 0, rc);
5539 		goto qdir_exit;
5540 	}
5541 	resp_buftype = CIFS_NO_BUFFER;
5542 
5543 	trace_smb3_query_dir_done(xid, persistent_fid, tcon->tid,
5544 			tcon->ses->Suid, index, srch_inf->entries_in_buffer);
5545 
5546 qdir_exit:
5547 	SMB2_query_directory_free(&rqst);
5548 	free_rsp_buf(resp_buftype, rsp);
5549 
5550 	if (is_replayable_error(rc) &&
5551 	    smb2_should_replay(tcon, &retries, &cur_sleep))
5552 		goto replay_again;
5553 
5554 	return rc;
5555 }
5556 
5557 int
SMB2_set_info_init(struct cifs_tcon * tcon,struct TCP_Server_Info * server,struct smb_rqst * rqst,u64 persistent_fid,u64 volatile_fid,u32 pid,u8 info_class,u8 info_type,u32 additional_info,void ** data,unsigned int * size)5558 SMB2_set_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
5559 		   struct smb_rqst *rqst,
5560 		   u64 persistent_fid, u64 volatile_fid, u32 pid,
5561 		   u8 info_class, u8 info_type, u32 additional_info,
5562 		   void **data, unsigned int *size)
5563 {
5564 	struct smb2_set_info_req *req;
5565 	struct kvec *iov = rqst->rq_iov;
5566 	unsigned int i, total_len;
5567 	int rc;
5568 
5569 	rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, server,
5570 				 (void **) &req, &total_len);
5571 	if (rc)
5572 		return rc;
5573 
5574 	req->hdr.Id.SyncId.ProcessId = cpu_to_le32(pid);
5575 	req->InfoType = info_type;
5576 	req->FileInfoClass = info_class;
5577 	req->PersistentFileId = persistent_fid;
5578 	req->VolatileFileId = volatile_fid;
5579 	req->AdditionalInformation = cpu_to_le32(additional_info);
5580 
5581 	req->BufferOffset = cpu_to_le16(sizeof(struct smb2_set_info_req));
5582 	req->BufferLength = cpu_to_le32(*size);
5583 
5584 	memcpy(req->Buffer, *data, *size);
5585 	total_len += *size;
5586 
5587 	iov[0].iov_base = (char *)req;
5588 	/* 1 for Buffer */
5589 	iov[0].iov_len = total_len - 1;
5590 
5591 	for (i = 1; i < rqst->rq_nvec; i++) {
5592 		le32_add_cpu(&req->BufferLength, size[i]);
5593 		iov[i].iov_base = (char *)data[i];
5594 		iov[i].iov_len = size[i];
5595 	}
5596 
5597 	return 0;
5598 }
5599 
5600 void
SMB2_set_info_free(struct smb_rqst * rqst)5601 SMB2_set_info_free(struct smb_rqst *rqst)
5602 {
5603 	if (rqst && rqst->rq_iov)
5604 		cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
5605 }
5606 
5607 static int
send_set_info(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid,u32 pid,u8 info_class,u8 info_type,u32 additional_info,unsigned int num,void ** data,unsigned int * size)5608 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
5609 	       u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
5610 	       u8 info_type, u32 additional_info, unsigned int num,
5611 		void **data, unsigned int *size)
5612 {
5613 	struct smb_rqst rqst;
5614 	struct smb2_set_info_rsp *rsp = NULL;
5615 	struct kvec *iov;
5616 	struct kvec rsp_iov;
5617 	int rc = 0;
5618 	int resp_buftype;
5619 	struct cifs_ses *ses = tcon->ses;
5620 	struct TCP_Server_Info *server;
5621 	int flags = 0;
5622 	int retries = 0, cur_sleep = 1;
5623 
5624 replay_again:
5625 	/* reinitialize for possible replay */
5626 	flags = 0;
5627 	server = cifs_pick_channel(ses);
5628 
5629 	if (!ses || !server)
5630 		return -EIO;
5631 
5632 	if (!num)
5633 		return -EINVAL;
5634 
5635 	if (smb3_encryption_required(tcon))
5636 		flags |= CIFS_TRANSFORM_REQ;
5637 
5638 	iov = kmalloc_array(num, sizeof(struct kvec), GFP_KERNEL);
5639 	if (!iov)
5640 		return -ENOMEM;
5641 
5642 	memset(&rqst, 0, sizeof(struct smb_rqst));
5643 	rqst.rq_iov = iov;
5644 	rqst.rq_nvec = num;
5645 
5646 	rc = SMB2_set_info_init(tcon, server,
5647 				&rqst, persistent_fid, volatile_fid, pid,
5648 				info_class, info_type, additional_info,
5649 				data, size);
5650 	if (rc) {
5651 		kfree(iov);
5652 		return rc;
5653 	}
5654 
5655 	if (retries)
5656 		smb2_set_replay(server, &rqst);
5657 
5658 	rc = cifs_send_recv(xid, ses, server,
5659 			    &rqst, &resp_buftype, flags,
5660 			    &rsp_iov);
5661 	SMB2_set_info_free(&rqst);
5662 	rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
5663 
5664 	if (rc != 0) {
5665 		cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
5666 		trace_smb3_set_info_err(xid, persistent_fid, tcon->tid,
5667 				ses->Suid, info_class, (__u32)info_type, rc);
5668 	}
5669 
5670 	free_rsp_buf(resp_buftype, rsp);
5671 	kfree(iov);
5672 
5673 	if (is_replayable_error(rc) &&
5674 	    smb2_should_replay(tcon, &retries, &cur_sleep))
5675 		goto replay_again;
5676 
5677 	return rc;
5678 }
5679 
5680 int
SMB2_set_eof(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid,u32 pid,loff_t new_eof)5681 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
5682 	     u64 volatile_fid, u32 pid, loff_t new_eof)
5683 {
5684 	struct smb2_file_eof_info info;
5685 	void *data;
5686 	unsigned int size;
5687 
5688 	info.EndOfFile = cpu_to_le64(new_eof);
5689 
5690 	data = &info;
5691 	size = sizeof(struct smb2_file_eof_info);
5692 
5693 	trace_smb3_set_eof(xid, persistent_fid, tcon->tid, tcon->ses->Suid, new_eof);
5694 
5695 	return send_set_info(xid, tcon, persistent_fid, volatile_fid,
5696 			pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
5697 			0, 1, &data, &size);
5698 }
5699 
5700 int
SMB2_set_acl(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid,struct smb_ntsd * pnntsd,int pacllen,int aclflag)5701 SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,
5702 		u64 persistent_fid, u64 volatile_fid,
5703 		struct smb_ntsd *pnntsd, int pacllen, int aclflag)
5704 {
5705 	return send_set_info(xid, tcon, persistent_fid, volatile_fid,
5706 			current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag,
5707 			1, (void **)&pnntsd, &pacllen);
5708 }
5709 
5710 int
SMB2_set_ea(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid,struct smb2_file_full_ea_info * buf,int len)5711 SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
5712 	    u64 persistent_fid, u64 volatile_fid,
5713 	    struct smb2_file_full_ea_info *buf, int len)
5714 {
5715 	return send_set_info(xid, tcon, persistent_fid, volatile_fid,
5716 		current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE,
5717 		0, 1, (void **)&buf, &len);
5718 }
5719 
5720 int
SMB2_oplock_break(const unsigned int xid,struct cifs_tcon * tcon,const u64 persistent_fid,const u64 volatile_fid,__u8 oplock_level)5721 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
5722 		  const u64 persistent_fid, const u64 volatile_fid,
5723 		  __u8 oplock_level)
5724 {
5725 	struct smb_rqst rqst;
5726 	int rc;
5727 	struct smb2_oplock_break *req = NULL;
5728 	struct cifs_ses *ses = tcon->ses;
5729 	struct TCP_Server_Info *server;
5730 	int flags = CIFS_OBREAK_OP;
5731 	unsigned int total_len;
5732 	struct kvec iov[1];
5733 	struct kvec rsp_iov;
5734 	int resp_buf_type;
5735 	int retries = 0, cur_sleep = 1;
5736 
5737 replay_again:
5738 	/* reinitialize for possible replay */
5739 	flags = CIFS_OBREAK_OP;
5740 	server = cifs_pick_channel(ses);
5741 
5742 	cifs_dbg(FYI, "SMB2_oplock_break\n");
5743 	rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server,
5744 				 (void **) &req, &total_len);
5745 	if (rc)
5746 		return rc;
5747 
5748 	if (smb3_encryption_required(tcon))
5749 		flags |= CIFS_TRANSFORM_REQ;
5750 
5751 	req->VolatileFid = volatile_fid;
5752 	req->PersistentFid = persistent_fid;
5753 	req->OplockLevel = oplock_level;
5754 	req->hdr.CreditRequest = cpu_to_le16(1);
5755 
5756 	flags |= CIFS_NO_RSP_BUF;
5757 
5758 	iov[0].iov_base = (char *)req;
5759 	iov[0].iov_len = total_len;
5760 
5761 	memset(&rqst, 0, sizeof(struct smb_rqst));
5762 	rqst.rq_iov = iov;
5763 	rqst.rq_nvec = 1;
5764 
5765 	if (retries)
5766 		smb2_set_replay(server, &rqst);
5767 
5768 	rc = cifs_send_recv(xid, ses, server,
5769 			    &rqst, &resp_buf_type, flags, &rsp_iov);
5770 	cifs_small_buf_release(req);
5771 	if (rc) {
5772 		cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
5773 		cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
5774 	}
5775 
5776 	if (is_replayable_error(rc) &&
5777 	    smb2_should_replay(tcon, &retries, &cur_sleep))
5778 		goto replay_again;
5779 
5780 	return rc;
5781 }
5782 
5783 void
smb2_copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info * pfs_inf,struct kstatfs * kst)5784 smb2_copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
5785 			     struct kstatfs *kst)
5786 {
5787 	kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
5788 			  le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
5789 	kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
5790 	kst->f_bfree  = kst->f_bavail =
5791 			le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
5792 	return;
5793 }
5794 
5795 static void
copy_posix_fs_info_to_kstatfs(FILE_SYSTEM_POSIX_INFO * response_data,struct kstatfs * kst)5796 copy_posix_fs_info_to_kstatfs(FILE_SYSTEM_POSIX_INFO *response_data,
5797 			struct kstatfs *kst)
5798 {
5799 	kst->f_bsize = le32_to_cpu(response_data->BlockSize);
5800 	kst->f_blocks = le64_to_cpu(response_data->TotalBlocks);
5801 	kst->f_bfree =  le64_to_cpu(response_data->BlocksAvail);
5802 	if (response_data->UserBlocksAvail == cpu_to_le64(-1))
5803 		kst->f_bavail = kst->f_bfree;
5804 	else
5805 		kst->f_bavail = le64_to_cpu(response_data->UserBlocksAvail);
5806 	if (response_data->TotalFileNodes != cpu_to_le64(-1))
5807 		kst->f_files = le64_to_cpu(response_data->TotalFileNodes);
5808 	if (response_data->FreeFileNodes != cpu_to_le64(-1))
5809 		kst->f_ffree = le64_to_cpu(response_data->FreeFileNodes);
5810 
5811 	return;
5812 }
5813 
5814 static int
build_qfs_info_req(struct kvec * iov,struct cifs_tcon * tcon,struct TCP_Server_Info * server,int level,int outbuf_len,u64 persistent_fid,u64 volatile_fid)5815 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon,
5816 		   struct TCP_Server_Info *server,
5817 		   int level, int outbuf_len, u64 persistent_fid,
5818 		   u64 volatile_fid)
5819 {
5820 	int rc;
5821 	struct smb2_query_info_req *req;
5822 	unsigned int total_len;
5823 
5824 	cifs_dbg(FYI, "Query FSInfo level %d\n", level);
5825 
5826 	if ((tcon->ses == NULL) || server == NULL)
5827 		return -EIO;
5828 
5829 	rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server,
5830 				 (void **) &req, &total_len);
5831 	if (rc)
5832 		return rc;
5833 
5834 	req->InfoType = SMB2_O_INFO_FILESYSTEM;
5835 	req->FileInfoClass = level;
5836 	req->PersistentFileId = persistent_fid;
5837 	req->VolatileFileId = volatile_fid;
5838 	/* 1 for pad */
5839 	req->InputBufferOffset =
5840 			cpu_to_le16(sizeof(struct smb2_query_info_req));
5841 	req->OutputBufferLength = cpu_to_le32(
5842 		outbuf_len + sizeof(struct smb2_query_info_rsp));
5843 
5844 	iov->iov_base = (char *)req;
5845 	iov->iov_len = total_len;
5846 	return 0;
5847 }
5848 
free_qfs_info_req(struct kvec * iov)5849 static inline void free_qfs_info_req(struct kvec *iov)
5850 {
5851 	cifs_buf_release(iov->iov_base);
5852 }
5853 
5854 int
SMB311_posix_qfs_info(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid,struct kstatfs * fsdata)5855 SMB311_posix_qfs_info(const unsigned int xid, struct cifs_tcon *tcon,
5856 	      u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
5857 {
5858 	struct smb_rqst rqst;
5859 	struct smb2_query_info_rsp *rsp = NULL;
5860 	struct kvec iov;
5861 	struct kvec rsp_iov;
5862 	int rc = 0;
5863 	int resp_buftype;
5864 	struct cifs_ses *ses = tcon->ses;
5865 	struct TCP_Server_Info *server;
5866 	FILE_SYSTEM_POSIX_INFO *info = NULL;
5867 	int flags = 0;
5868 	int retries = 0, cur_sleep = 1;
5869 
5870 replay_again:
5871 	/* reinitialize for possible replay */
5872 	flags = 0;
5873 	server = cifs_pick_channel(ses);
5874 
5875 	rc = build_qfs_info_req(&iov, tcon, server,
5876 				FS_POSIX_INFORMATION,
5877 				sizeof(FILE_SYSTEM_POSIX_INFO),
5878 				persistent_fid, volatile_fid);
5879 	if (rc)
5880 		return rc;
5881 
5882 	if (smb3_encryption_required(tcon))
5883 		flags |= CIFS_TRANSFORM_REQ;
5884 
5885 	memset(&rqst, 0, sizeof(struct smb_rqst));
5886 	rqst.rq_iov = &iov;
5887 	rqst.rq_nvec = 1;
5888 
5889 	if (retries)
5890 		smb2_set_replay(server, &rqst);
5891 
5892 	rc = cifs_send_recv(xid, ses, server,
5893 			    &rqst, &resp_buftype, flags, &rsp_iov);
5894 	free_qfs_info_req(&iov);
5895 	if (rc) {
5896 		cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5897 		goto posix_qfsinf_exit;
5898 	}
5899 	rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5900 
5901 	info = (FILE_SYSTEM_POSIX_INFO *)(
5902 		le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
5903 	rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
5904 			       le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
5905 			       sizeof(FILE_SYSTEM_POSIX_INFO));
5906 	if (!rc)
5907 		copy_posix_fs_info_to_kstatfs(info, fsdata);
5908 
5909 posix_qfsinf_exit:
5910 	free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5911 
5912 	if (is_replayable_error(rc) &&
5913 	    smb2_should_replay(tcon, &retries, &cur_sleep))
5914 		goto replay_again;
5915 
5916 	return rc;
5917 }
5918 
5919 int
SMB2_QFS_info(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid,struct kstatfs * fsdata)5920 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
5921 	      u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
5922 {
5923 	struct smb_rqst rqst;
5924 	struct smb2_query_info_rsp *rsp = NULL;
5925 	struct kvec iov;
5926 	struct kvec rsp_iov;
5927 	int rc = 0;
5928 	int resp_buftype;
5929 	struct cifs_ses *ses = tcon->ses;
5930 	struct TCP_Server_Info *server;
5931 	struct smb2_fs_full_size_info *info = NULL;
5932 	int flags = 0;
5933 	int retries = 0, cur_sleep = 1;
5934 
5935 replay_again:
5936 	/* reinitialize for possible replay */
5937 	flags = 0;
5938 	server = cifs_pick_channel(ses);
5939 
5940 	rc = build_qfs_info_req(&iov, tcon, server,
5941 				FS_FULL_SIZE_INFORMATION,
5942 				sizeof(struct smb2_fs_full_size_info),
5943 				persistent_fid, volatile_fid);
5944 	if (rc)
5945 		return rc;
5946 
5947 	if (smb3_encryption_required(tcon))
5948 		flags |= CIFS_TRANSFORM_REQ;
5949 
5950 	memset(&rqst, 0, sizeof(struct smb_rqst));
5951 	rqst.rq_iov = &iov;
5952 	rqst.rq_nvec = 1;
5953 
5954 	if (retries)
5955 		smb2_set_replay(server, &rqst);
5956 
5957 	rc = cifs_send_recv(xid, ses, server,
5958 			    &rqst, &resp_buftype, flags, &rsp_iov);
5959 	free_qfs_info_req(&iov);
5960 	if (rc) {
5961 		cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5962 		goto qfsinf_exit;
5963 	}
5964 	rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5965 
5966 	info = (struct smb2_fs_full_size_info *)(
5967 		le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
5968 	rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
5969 			       le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
5970 			       sizeof(struct smb2_fs_full_size_info));
5971 	if (!rc)
5972 		smb2_copy_fs_info_to_kstatfs(info, fsdata);
5973 
5974 qfsinf_exit:
5975 	free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5976 
5977 	if (is_replayable_error(rc) &&
5978 	    smb2_should_replay(tcon, &retries, &cur_sleep))
5979 		goto replay_again;
5980 
5981 	return rc;
5982 }
5983 
5984 int
SMB2_QFS_attr(const unsigned int xid,struct cifs_tcon * tcon,u64 persistent_fid,u64 volatile_fid,int level)5985 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
5986 	      u64 persistent_fid, u64 volatile_fid, int level)
5987 {
5988 	struct smb_rqst rqst;
5989 	struct smb2_query_info_rsp *rsp = NULL;
5990 	struct kvec iov;
5991 	struct kvec rsp_iov;
5992 	int rc = 0;
5993 	int resp_buftype, max_len, min_len;
5994 	struct cifs_ses *ses = tcon->ses;
5995 	struct TCP_Server_Info *server;
5996 	unsigned int rsp_len, offset;
5997 	int flags = 0;
5998 	int retries = 0, cur_sleep = 1;
5999 
6000 replay_again:
6001 	/* reinitialize for possible replay */
6002 	flags = 0;
6003 	server = cifs_pick_channel(ses);
6004 
6005 	if (level == FS_DEVICE_INFORMATION) {
6006 		max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
6007 		min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
6008 	} else if (level == FS_ATTRIBUTE_INFORMATION) {
6009 		max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
6010 		min_len = MIN_FS_ATTR_INFO_SIZE;
6011 	} else if (level == FS_SECTOR_SIZE_INFORMATION) {
6012 		max_len = sizeof(struct smb3_fs_ss_info);
6013 		min_len = sizeof(struct smb3_fs_ss_info);
6014 	} else if (level == FS_VOLUME_INFORMATION) {
6015 		max_len = sizeof(struct smb3_fs_vol_info) + MAX_VOL_LABEL_LEN;
6016 		min_len = sizeof(struct smb3_fs_vol_info);
6017 	} else {
6018 		cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
6019 		return -EINVAL;
6020 	}
6021 
6022 	rc = build_qfs_info_req(&iov, tcon, server,
6023 				level, max_len,
6024 				persistent_fid, volatile_fid);
6025 	if (rc)
6026 		return rc;
6027 
6028 	if (smb3_encryption_required(tcon))
6029 		flags |= CIFS_TRANSFORM_REQ;
6030 
6031 	memset(&rqst, 0, sizeof(struct smb_rqst));
6032 	rqst.rq_iov = &iov;
6033 	rqst.rq_nvec = 1;
6034 
6035 	if (retries)
6036 		smb2_set_replay(server, &rqst);
6037 
6038 	rc = cifs_send_recv(xid, ses, server,
6039 			    &rqst, &resp_buftype, flags, &rsp_iov);
6040 	free_qfs_info_req(&iov);
6041 	if (rc) {
6042 		cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
6043 		goto qfsattr_exit;
6044 	}
6045 	rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
6046 
6047 	rsp_len = le32_to_cpu(rsp->OutputBufferLength);
6048 	offset = le16_to_cpu(rsp->OutputBufferOffset);
6049 	rc = smb2_validate_iov(offset, rsp_len, &rsp_iov, min_len);
6050 	if (rc)
6051 		goto qfsattr_exit;
6052 
6053 	if (level == FS_ATTRIBUTE_INFORMATION)
6054 		memcpy(&tcon->fsAttrInfo, offset
6055 			+ (char *)rsp, min_t(unsigned int,
6056 			rsp_len, max_len));
6057 	else if (level == FS_DEVICE_INFORMATION)
6058 		memcpy(&tcon->fsDevInfo, offset
6059 			+ (char *)rsp, sizeof(FILE_SYSTEM_DEVICE_INFO));
6060 	else if (level == FS_SECTOR_SIZE_INFORMATION) {
6061 		struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
6062 			(offset + (char *)rsp);
6063 		tcon->ss_flags = le32_to_cpu(ss_info->Flags);
6064 		tcon->perf_sector_size =
6065 			le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
6066 	} else if (level == FS_VOLUME_INFORMATION) {
6067 		struct smb3_fs_vol_info *vol_info = (struct smb3_fs_vol_info *)
6068 			(offset + (char *)rsp);
6069 		tcon->vol_serial_number = vol_info->VolumeSerialNumber;
6070 		tcon->vol_create_time = vol_info->VolumeCreationTime;
6071 	}
6072 
6073 qfsattr_exit:
6074 	free_rsp_buf(resp_buftype, rsp_iov.iov_base);
6075 
6076 	if (is_replayable_error(rc) &&
6077 	    smb2_should_replay(tcon, &retries, &cur_sleep))
6078 		goto replay_again;
6079 
6080 	return rc;
6081 }
6082 
6083 int
smb2_lockv(const unsigned int xid,struct cifs_tcon * tcon,const __u64 persist_fid,const __u64 volatile_fid,const __u32 pid,const __u32 num_lock,struct smb2_lock_element * buf)6084 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
6085 	   const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
6086 	   const __u32 num_lock, struct smb2_lock_element *buf)
6087 {
6088 	struct smb_rqst rqst;
6089 	int rc = 0;
6090 	struct smb2_lock_req *req = NULL;
6091 	struct kvec iov[2];
6092 	struct kvec rsp_iov;
6093 	int resp_buf_type;
6094 	unsigned int count;
6095 	int flags = CIFS_NO_RSP_BUF;
6096 	unsigned int total_len;
6097 	struct TCP_Server_Info *server;
6098 	int retries = 0, cur_sleep = 1;
6099 
6100 replay_again:
6101 	/* reinitialize for possible replay */
6102 	flags = CIFS_NO_RSP_BUF;
6103 	server = cifs_pick_channel(tcon->ses);
6104 
6105 	cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
6106 
6107 	rc = smb2_plain_req_init(SMB2_LOCK, tcon, server,
6108 				 (void **) &req, &total_len);
6109 	if (rc)
6110 		return rc;
6111 
6112 	if (smb3_encryption_required(tcon))
6113 		flags |= CIFS_TRANSFORM_REQ;
6114 
6115 	req->hdr.Id.SyncId.ProcessId = cpu_to_le32(pid);
6116 	req->LockCount = cpu_to_le16(num_lock);
6117 
6118 	req->PersistentFileId = persist_fid;
6119 	req->VolatileFileId = volatile_fid;
6120 
6121 	count = num_lock * sizeof(struct smb2_lock_element);
6122 
6123 	iov[0].iov_base = (char *)req;
6124 	iov[0].iov_len = total_len - sizeof(struct smb2_lock_element);
6125 	iov[1].iov_base = (char *)buf;
6126 	iov[1].iov_len = count;
6127 
6128 	cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
6129 
6130 	memset(&rqst, 0, sizeof(struct smb_rqst));
6131 	rqst.rq_iov = iov;
6132 	rqst.rq_nvec = 2;
6133 
6134 	if (retries)
6135 		smb2_set_replay(server, &rqst);
6136 
6137 	rc = cifs_send_recv(xid, tcon->ses, server,
6138 			    &rqst, &resp_buf_type, flags,
6139 			    &rsp_iov);
6140 	cifs_small_buf_release(req);
6141 	if (rc) {
6142 		cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
6143 		cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
6144 		trace_smb3_lock_err(xid, persist_fid, tcon->tid,
6145 				    tcon->ses->Suid, rc);
6146 	}
6147 
6148 	if (is_replayable_error(rc) &&
6149 	    smb2_should_replay(tcon, &retries, &cur_sleep))
6150 		goto replay_again;
6151 
6152 	return rc;
6153 }
6154 
6155 int
SMB2_lock(const unsigned int xid,struct cifs_tcon * tcon,const __u64 persist_fid,const __u64 volatile_fid,const __u32 pid,const __u64 length,const __u64 offset,const __u32 lock_flags,const bool wait)6156 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
6157 	  const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
6158 	  const __u64 length, const __u64 offset, const __u32 lock_flags,
6159 	  const bool wait)
6160 {
6161 	struct smb2_lock_element lock;
6162 
6163 	lock.Offset = cpu_to_le64(offset);
6164 	lock.Length = cpu_to_le64(length);
6165 	lock.Flags = cpu_to_le32(lock_flags);
6166 	if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
6167 		lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
6168 
6169 	return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
6170 }
6171 
6172 int
SMB2_lease_break(const unsigned int xid,struct cifs_tcon * tcon,__u8 * lease_key,const __le32 lease_state)6173 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
6174 		 __u8 *lease_key, const __le32 lease_state)
6175 {
6176 	struct smb_rqst rqst;
6177 	int rc;
6178 	struct smb2_lease_ack *req = NULL;
6179 	struct cifs_ses *ses = tcon->ses;
6180 	int flags = CIFS_OBREAK_OP;
6181 	unsigned int total_len;
6182 	struct kvec iov[1];
6183 	struct kvec rsp_iov;
6184 	int resp_buf_type;
6185 	__u64 *please_key_high;
6186 	__u64 *please_key_low;
6187 	struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses);
6188 
6189 	cifs_dbg(FYI, "SMB2_lease_break\n");
6190 	rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server,
6191 				 (void **) &req, &total_len);
6192 	if (rc)
6193 		return rc;
6194 
6195 	if (smb3_encryption_required(tcon))
6196 		flags |= CIFS_TRANSFORM_REQ;
6197 
6198 	req->hdr.CreditRequest = cpu_to_le16(1);
6199 	req->StructureSize = cpu_to_le16(36);
6200 	total_len += 12;
6201 
6202 	memcpy(req->LeaseKey, lease_key, SMB2_LEASE_KEY_SIZE);
6203 	req->LeaseState = lease_state;
6204 
6205 	flags |= CIFS_NO_RSP_BUF;
6206 
6207 	iov[0].iov_base = (char *)req;
6208 	iov[0].iov_len = total_len;
6209 
6210 	memset(&rqst, 0, sizeof(struct smb_rqst));
6211 	rqst.rq_iov = iov;
6212 	rqst.rq_nvec = 1;
6213 
6214 	rc = cifs_send_recv(xid, ses, server,
6215 			    &rqst, &resp_buf_type, flags, &rsp_iov);
6216 	cifs_small_buf_release(req);
6217 
6218 	please_key_low = (__u64 *)lease_key;
6219 	please_key_high = (__u64 *)(lease_key+8);
6220 	if (rc) {
6221 		cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
6222 		trace_smb3_lease_err(le32_to_cpu(lease_state), tcon->tid,
6223 			ses->Suid, *please_key_low, *please_key_high, rc);
6224 		cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
6225 	} else
6226 		trace_smb3_lease_done(le32_to_cpu(lease_state), tcon->tid,
6227 			ses->Suid, *please_key_low, *please_key_high);
6228 
6229 	return rc;
6230 }
6231