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1da177e4 LT |
1 | /* |
2 | * fs/cifs/misc.c | |
3 | * | |
ad7a2926 | 4 | * Copyright (C) International Business Machines Corp., 2002,2008 |
1da177e4 LT |
5 | * Author(s): Steve French (sfrench@us.ibm.com) |
6 | * | |
7 | * This library is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU Lesser General Public License as published | |
9 | * by the Free Software Foundation; either version 2.1 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This library is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
15 | * the GNU Lesser General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU Lesser General Public License | |
18 | * along with this library; if not, write to the Free Software | |
fb8c4b14 | 19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
1da177e4 LT |
20 | */ |
21 | ||
22 | #include <linux/slab.h> | |
23 | #include <linux/ctype.h> | |
24 | #include <linux/mempool.h> | |
ccf7f408 | 25 | #include <linux/vmalloc.h> |
1da177e4 LT |
26 | #include "cifspdu.h" |
27 | #include "cifsglob.h" | |
28 | #include "cifsproto.h" | |
29 | #include "cifs_debug.h" | |
30 | #include "smberr.h" | |
31 | #include "nterr.h" | |
6c91d362 | 32 | #include "cifs_unicode.h" |
3792c173 | 33 | #include "smb2pdu.h" |
1da177e4 LT |
34 | |
35 | extern mempool_t *cifs_sm_req_poolp; | |
36 | extern mempool_t *cifs_req_poolp; | |
1da177e4 | 37 | |
fb8c4b14 SF |
38 | /* The xid serves as a useful identifier for each incoming vfs request, |
39 | in a similar way to the mid which is useful to track each sent smb, | |
40 | and CurrentXid can also provide a running counter (although it | |
41 | will eventually wrap past zero) of the total vfs operations handled | |
1da177e4 LT |
42 | since the cifs fs was mounted */ |
43 | ||
44 | unsigned int | |
6d5786a3 | 45 | _get_xid(void) |
1da177e4 LT |
46 | { |
47 | unsigned int xid; | |
48 | ||
49 | spin_lock(&GlobalMid_Lock); | |
50 | GlobalTotalActiveXid++; | |
50c2f753 SF |
51 | |
52 | /* keep high water mark for number of simultaneous ops in filesystem */ | |
1da177e4 | 53 | if (GlobalTotalActiveXid > GlobalMaxActiveXid) |
50c2f753 | 54 | GlobalMaxActiveXid = GlobalTotalActiveXid; |
790fe579 | 55 | if (GlobalTotalActiveXid > 65000) |
f96637be | 56 | cifs_dbg(FYI, "warning: more than 65000 requests active\n"); |
1da177e4 LT |
57 | xid = GlobalCurrentXid++; |
58 | spin_unlock(&GlobalMid_Lock); | |
59 | return xid; | |
60 | } | |
61 | ||
62 | void | |
6d5786a3 | 63 | _free_xid(unsigned int xid) |
1da177e4 LT |
64 | { |
65 | spin_lock(&GlobalMid_Lock); | |
790fe579 | 66 | /* if (GlobalTotalActiveXid == 0) |
1da177e4 LT |
67 | BUG(); */ |
68 | GlobalTotalActiveXid--; | |
69 | spin_unlock(&GlobalMid_Lock); | |
70 | } | |
71 | ||
96daf2b0 | 72 | struct cifs_ses * |
1da177e4 LT |
73 | sesInfoAlloc(void) |
74 | { | |
96daf2b0 | 75 | struct cifs_ses *ret_buf; |
1da177e4 | 76 | |
96daf2b0 | 77 | ret_buf = kzalloc(sizeof(struct cifs_ses), GFP_KERNEL); |
1da177e4 | 78 | if (ret_buf) { |
1da177e4 LT |
79 | atomic_inc(&sesInfoAllocCount); |
80 | ret_buf->status = CifsNew; | |
14fbf50d JL |
81 | ++ret_buf->ses_count; |
82 | INIT_LIST_HEAD(&ret_buf->smb_ses_list); | |
f1987b44 | 83 | INIT_LIST_HEAD(&ret_buf->tcon_list); |
d7b619cf | 84 | mutex_init(&ret_buf->session_mutex); |
1da177e4 LT |
85 | } |
86 | return ret_buf; | |
87 | } | |
88 | ||
89 | void | |
96daf2b0 | 90 | sesInfoFree(struct cifs_ses *buf_to_free) |
1da177e4 LT |
91 | { |
92 | if (buf_to_free == NULL) { | |
f96637be | 93 | cifs_dbg(FYI, "Null buffer passed to sesInfoFree\n"); |
1da177e4 LT |
94 | return; |
95 | } | |
96 | ||
1da177e4 | 97 | atomic_dec(&sesInfoAllocCount); |
f99d49ad JJ |
98 | kfree(buf_to_free->serverOS); |
99 | kfree(buf_to_free->serverDomain); | |
100 | kfree(buf_to_free->serverNOS); | |
55162dec JL |
101 | if (buf_to_free->password) { |
102 | memset(buf_to_free->password, 0, strlen(buf_to_free->password)); | |
103 | kfree(buf_to_free->password); | |
104 | } | |
8727c8a8 | 105 | kfree(buf_to_free->user_name); |
3979877e | 106 | kfree(buf_to_free->domainName); |
d4e63bd6 | 107 | kfree(buf_to_free->auth_key.response); |
1da177e4 LT |
108 | kfree(buf_to_free); |
109 | } | |
110 | ||
96daf2b0 | 111 | struct cifs_tcon * |
1da177e4 LT |
112 | tconInfoAlloc(void) |
113 | { | |
96daf2b0 SF |
114 | struct cifs_tcon *ret_buf; |
115 | ret_buf = kzalloc(sizeof(struct cifs_tcon), GFP_KERNEL); | |
1da177e4 | 116 | if (ret_buf) { |
1da177e4 | 117 | atomic_inc(&tconInfoAllocCount); |
1da177e4 | 118 | ret_buf->tidStatus = CifsNew; |
f1987b44 | 119 | ++ret_buf->tc_count; |
1da177e4 | 120 | INIT_LIST_HEAD(&ret_buf->openFileList); |
f1987b44 | 121 | INIT_LIST_HEAD(&ret_buf->tcon_list); |
3afca265 | 122 | spin_lock_init(&ret_buf->open_file_lock); |
1da177e4 LT |
123 | #ifdef CONFIG_CIFS_STATS |
124 | spin_lock_init(&ret_buf->stat_lock); | |
125 | #endif | |
1da177e4 LT |
126 | } |
127 | return ret_buf; | |
128 | } | |
129 | ||
130 | void | |
96daf2b0 | 131 | tconInfoFree(struct cifs_tcon *buf_to_free) |
1da177e4 LT |
132 | { |
133 | if (buf_to_free == NULL) { | |
f96637be | 134 | cifs_dbg(FYI, "Null buffer passed to tconInfoFree\n"); |
1da177e4 LT |
135 | return; |
136 | } | |
1da177e4 | 137 | atomic_dec(&tconInfoAllocCount); |
f99d49ad | 138 | kfree(buf_to_free->nativeFileSystem); |
00e485b0 JL |
139 | if (buf_to_free->password) { |
140 | memset(buf_to_free->password, 0, strlen(buf_to_free->password)); | |
141 | kfree(buf_to_free->password); | |
142 | } | |
1da177e4 LT |
143 | kfree(buf_to_free); |
144 | } | |
145 | ||
146 | struct smb_hdr * | |
147 | cifs_buf_get(void) | |
148 | { | |
149 | struct smb_hdr *ret_buf = NULL; | |
3792c173 PS |
150 | /* |
151 | * SMB2 header is bigger than CIFS one - no problems to clean some | |
152 | * more bytes for CIFS. | |
153 | */ | |
2a38e120 SF |
154 | size_t buf_size = sizeof(struct smb2_hdr); |
155 | ||
3792c173 PS |
156 | /* |
157 | * We could use negotiated size instead of max_msgsize - | |
158 | * but it may be more efficient to always alloc same size | |
159 | * albeit slightly larger than necessary and maxbuffersize | |
160 | * defaults to this and can not be bigger. | |
161 | */ | |
232087cb | 162 | ret_buf = mempool_alloc(cifs_req_poolp, GFP_NOFS); |
1da177e4 LT |
163 | |
164 | /* clear the first few header bytes */ | |
165 | /* for most paths, more is cleared in header_assemble */ | |
a6f74e80 N |
166 | memset(ret_buf, 0, buf_size + 3); |
167 | atomic_inc(&bufAllocCount); | |
4498eed5 | 168 | #ifdef CONFIG_CIFS_STATS2 |
a6f74e80 | 169 | atomic_inc(&totBufAllocCount); |
4498eed5 | 170 | #endif /* CONFIG_CIFS_STATS2 */ |
1da177e4 LT |
171 | |
172 | return ret_buf; | |
173 | } | |
174 | ||
175 | void | |
176 | cifs_buf_release(void *buf_to_free) | |
177 | { | |
1da177e4 | 178 | if (buf_to_free == NULL) { |
f96637be | 179 | /* cifs_dbg(FYI, "Null buffer passed to cifs_buf_release\n");*/ |
1da177e4 LT |
180 | return; |
181 | } | |
fb8c4b14 | 182 | mempool_free(buf_to_free, cifs_req_poolp); |
1da177e4 LT |
183 | |
184 | atomic_dec(&bufAllocCount); | |
185 | return; | |
186 | } | |
187 | ||
188 | struct smb_hdr * | |
189 | cifs_small_buf_get(void) | |
190 | { | |
191 | struct smb_hdr *ret_buf = NULL; | |
192 | ||
fb8c4b14 SF |
193 | /* We could use negotiated size instead of max_msgsize - |
194 | but it may be more efficient to always alloc same size | |
195 | albeit slightly larger than necessary and maxbuffersize | |
1da177e4 | 196 | defaults to this and can not be bigger */ |
232087cb | 197 | ret_buf = mempool_alloc(cifs_sm_req_poolp, GFP_NOFS); |
1da177e4 LT |
198 | /* No need to clear memory here, cleared in header assemble */ |
199 | /* memset(ret_buf, 0, sizeof(struct smb_hdr) + 27);*/ | |
a6f74e80 | 200 | atomic_inc(&smBufAllocCount); |
4498eed5 | 201 | #ifdef CONFIG_CIFS_STATS2 |
a6f74e80 | 202 | atomic_inc(&totSmBufAllocCount); |
4498eed5 SF |
203 | #endif /* CONFIG_CIFS_STATS2 */ |
204 | ||
1da177e4 LT |
205 | return ret_buf; |
206 | } | |
207 | ||
208 | void | |
209 | cifs_small_buf_release(void *buf_to_free) | |
210 | { | |
211 | ||
212 | if (buf_to_free == NULL) { | |
f96637be | 213 | cifs_dbg(FYI, "Null buffer passed to cifs_small_buf_release\n"); |
1da177e4 LT |
214 | return; |
215 | } | |
fb8c4b14 | 216 | mempool_free(buf_to_free, cifs_sm_req_poolp); |
1da177e4 LT |
217 | |
218 | atomic_dec(&smBufAllocCount); | |
219 | return; | |
220 | } | |
221 | ||
6d81ed1e SP |
222 | void |
223 | free_rsp_buf(int resp_buftype, void *rsp) | |
224 | { | |
225 | if (resp_buftype == CIFS_SMALL_BUFFER) | |
226 | cifs_small_buf_release(rsp); | |
227 | else if (resp_buftype == CIFS_LARGE_BUFFER) | |
228 | cifs_buf_release(rsp); | |
229 | } | |
230 | ||
1982c344 SF |
231 | /* NB: MID can not be set if treeCon not passed in, in that |
232 | case it is responsbility of caller to set the mid */ | |
1da177e4 LT |
233 | void |
234 | header_assemble(struct smb_hdr *buffer, char smb_command /* command */ , | |
96daf2b0 | 235 | const struct cifs_tcon *treeCon, int word_count |
1da177e4 LT |
236 | /* length of fixed section (word count) in two byte units */) |
237 | { | |
1da177e4 LT |
238 | char *temp = (char *) buffer; |
239 | ||
fb8c4b14 | 240 | memset(temp, 0, 256); /* bigger than MAX_CIFS_HDR_SIZE */ |
1da177e4 | 241 | |
be8e3b00 | 242 | buffer->smb_buf_length = cpu_to_be32( |
630f3f0c | 243 | (2 * word_count) + sizeof(struct smb_hdr) - |
1da177e4 | 244 | 4 /* RFC 1001 length field does not count */ + |
be8e3b00 | 245 | 2 /* for bcc field itself */) ; |
1da177e4 LT |
246 | |
247 | buffer->Protocol[0] = 0xFF; | |
248 | buffer->Protocol[1] = 'S'; | |
249 | buffer->Protocol[2] = 'M'; | |
250 | buffer->Protocol[3] = 'B'; | |
251 | buffer->Command = smb_command; | |
252 | buffer->Flags = 0x00; /* case sensitive */ | |
253 | buffer->Flags2 = SMBFLG2_KNOWS_LONG_NAMES; | |
254 | buffer->Pid = cpu_to_le16((__u16)current->tgid); | |
255 | buffer->PidHigh = cpu_to_le16((__u16)(current->tgid >> 16)); | |
1da177e4 LT |
256 | if (treeCon) { |
257 | buffer->Tid = treeCon->tid; | |
258 | if (treeCon->ses) { | |
259 | if (treeCon->ses->capabilities & CAP_UNICODE) | |
260 | buffer->Flags2 |= SMBFLG2_UNICODE; | |
ad7a2926 | 261 | if (treeCon->ses->capabilities & CAP_STATUS32) |
1da177e4 | 262 | buffer->Flags2 |= SMBFLG2_ERR_STATUS; |
ad7a2926 | 263 | |
1982c344 SF |
264 | /* Uid is not converted */ |
265 | buffer->Uid = treeCon->ses->Suid; | |
88257360 | 266 | buffer->Mid = get_next_mid(treeCon->ses->server); |
1da177e4 LT |
267 | } |
268 | if (treeCon->Flags & SMB_SHARE_IS_IN_DFS) | |
269 | buffer->Flags2 |= SMBFLG2_DFS; | |
d3485d37 SF |
270 | if (treeCon->nocase) |
271 | buffer->Flags |= SMBFLG_CASELESS; | |
790fe579 | 272 | if ((treeCon->ses) && (treeCon->ses->server)) |
38d77c50 | 273 | if (treeCon->ses->server->sign) |
1da177e4 LT |
274 | buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE; |
275 | } | |
276 | ||
277 | /* endian conversion of flags is now done just before sending */ | |
278 | buffer->WordCount = (char) word_count; | |
279 | return; | |
280 | } | |
281 | ||
2cd646a2 | 282 | static int |
944d6f1a | 283 | check_smb_hdr(struct smb_hdr *smb) |
1da177e4 | 284 | { |
68abaffa JL |
285 | /* does it have the right SMB "signature" ? */ |
286 | if (*(__le32 *) smb->Protocol != cpu_to_le32(0x424d53ff)) { | |
f96637be JP |
287 | cifs_dbg(VFS, "Bad protocol string signature header 0x%x\n", |
288 | *(unsigned int *)smb->Protocol); | |
68abaffa JL |
289 | return 1; |
290 | } | |
291 | ||
68abaffa JL |
292 | /* if it's a response then accept */ |
293 | if (smb->Flags & SMBFLG_RESPONSE) | |
294 | return 0; | |
295 | ||
296 | /* only one valid case where server sends us request */ | |
297 | if (smb->Command == SMB_COM_LOCKING_ANDX) | |
298 | return 0; | |
299 | ||
3d378d3f TG |
300 | cifs_dbg(VFS, "Server sent request, not response. mid=%u\n", |
301 | get_mid(smb)); | |
1da177e4 LT |
302 | return 1; |
303 | } | |
304 | ||
305 | int | |
373512ec | 306 | checkSMB(char *buf, unsigned int total_read, struct TCP_Server_Info *server) |
1da177e4 | 307 | { |
d4e4854f | 308 | struct smb_hdr *smb = (struct smb_hdr *)buf; |
376b43f4 | 309 | __u32 rfclen = be32_to_cpu(smb->smb_buf_length); |
190fdeb8 | 310 | __u32 clc_len; /* calculated length */ |
f96637be JP |
311 | cifs_dbg(FYI, "checkSMB Length: 0x%x, smb_buf_length: 0x%x\n", |
312 | total_read, rfclen); | |
d103e164 | 313 | |
376b43f4 JL |
314 | /* is this frame too small to even get to a BCC? */ |
315 | if (total_read < 2 + sizeof(struct smb_hdr)) { | |
316 | if ((total_read >= sizeof(struct smb_hdr) - 1) | |
1da177e4 | 317 | && (smb->Status.CifsError != 0)) { |
376b43f4 | 318 | /* it's an error return */ |
d103e164 SF |
319 | smb->WordCount = 0; |
320 | /* some error cases do not return wct and bcc */ | |
321 | return 0; | |
376b43f4 | 322 | } else if ((total_read == sizeof(struct smb_hdr) + 1) && |
d103e164 | 323 | (smb->WordCount == 0)) { |
fb8c4b14 | 324 | char *tmp = (char *)smb; |
d103e164 SF |
325 | /* Need to work around a bug in two servers here */ |
326 | /* First, check if the part of bcc they sent was zero */ | |
327 | if (tmp[sizeof(struct smb_hdr)] == 0) { | |
328 | /* some servers return only half of bcc | |
329 | * on simple responses (wct, bcc both zero) | |
330 | * in particular have seen this on | |
331 | * ulogoffX and FindClose. This leaves | |
332 | * one byte of bcc potentially unitialized | |
333 | */ | |
334 | /* zero rest of bcc */ | |
335 | tmp[sizeof(struct smb_hdr)+1] = 0; | |
46c79a64 | 336 | return 0; |
1da177e4 | 337 | } |
f96637be | 338 | cifs_dbg(VFS, "rcvd invalid byte count (bcc)\n"); |
d103e164 | 339 | } else { |
f96637be | 340 | cifs_dbg(VFS, "Length less than smb header size\n"); |
1da177e4 | 341 | } |
376b43f4 | 342 | return -EIO; |
1da177e4 LT |
343 | } |
344 | ||
376b43f4 | 345 | /* otherwise, there is enough to get to the BCC */ |
944d6f1a | 346 | if (check_smb_hdr(smb)) |
376b43f4 | 347 | return -EIO; |
820a803f | 348 | clc_len = smbCalcSize(smb); |
184ed211 | 349 | |
376b43f4 | 350 | if (4 + rfclen != total_read) { |
f96637be JP |
351 | cifs_dbg(VFS, "Length read does not match RFC1001 length %d\n", |
352 | rfclen); | |
376b43f4 | 353 | return -EIO; |
184ed211 SF |
354 | } |
355 | ||
376b43f4 | 356 | if (4 + rfclen != clc_len) { |
3d378d3f | 357 | __u16 mid = get_mid(smb); |
184ed211 | 358 | /* check if bcc wrapped around for large read responses */ |
376b43f4 | 359 | if ((rfclen > 64 * 1024) && (rfclen > clc_len)) { |
184ed211 | 360 | /* check if lengths match mod 64K */ |
376b43f4 | 361 | if (((4 + rfclen) & 0xFFFF) == (clc_len & 0xFFFF)) |
fb8c4b14 | 362 | return 0; /* bcc wrapped */ |
184ed211 | 363 | } |
f96637be | 364 | cifs_dbg(FYI, "Calculated size %u vs length %u mismatch for mid=%u\n", |
3d378d3f | 365 | clc_len, 4 + rfclen, mid); |
6284644e | 366 | |
376b43f4 | 367 | if (4 + rfclen < clc_len) { |
f96637be | 368 | cifs_dbg(VFS, "RFC1001 size %u smaller than SMB for mid=%u\n", |
3d378d3f | 369 | rfclen, mid); |
376b43f4 JL |
370 | return -EIO; |
371 | } else if (rfclen > clc_len + 512) { | |
6284644e JL |
372 | /* |
373 | * Some servers (Windows XP in particular) send more | |
374 | * data than the lengths in the SMB packet would | |
375 | * indicate on certain calls (byte range locks and | |
376 | * trans2 find first calls in particular). While the | |
377 | * client can handle such a frame by ignoring the | |
378 | * trailing data, we choose limit the amount of extra | |
379 | * data to 512 bytes. | |
380 | */ | |
f96637be | 381 | cifs_dbg(VFS, "RFC1001 size %u more than 512 bytes larger than SMB for mid=%u\n", |
3d378d3f | 382 | rfclen, mid); |
376b43f4 | 383 | return -EIO; |
46c79a64 | 384 | } |
1da177e4 | 385 | } |
20962438 | 386 | return 0; |
1da177e4 | 387 | } |
4b18f2a9 SF |
388 | |
389 | bool | |
d4e4854f | 390 | is_valid_oplock_break(char *buffer, struct TCP_Server_Info *srv) |
fb8c4b14 | 391 | { |
d4e4854f | 392 | struct smb_hdr *buf = (struct smb_hdr *)buffer; |
fb8c4b14 | 393 | struct smb_com_lock_req *pSMB = (struct smb_com_lock_req *)buf; |
f1987b44 | 394 | struct list_head *tmp, *tmp1, *tmp2; |
96daf2b0 SF |
395 | struct cifs_ses *ses; |
396 | struct cifs_tcon *tcon; | |
f1987b44 | 397 | struct cifsInodeInfo *pCifsInode; |
1da177e4 LT |
398 | struct cifsFileInfo *netfile; |
399 | ||
f96637be | 400 | cifs_dbg(FYI, "Checking for oplock break or dnotify response\n"); |
790fe579 | 401 | if ((pSMB->hdr.Command == SMB_COM_NT_TRANSACT) && |
1da177e4 | 402 | (pSMB->hdr.Flags & SMBFLG_RESPONSE)) { |
fb8c4b14 | 403 | struct smb_com_transaction_change_notify_rsp *pSMBr = |
1da177e4 | 404 | (struct smb_com_transaction_change_notify_rsp *)buf; |
fb8c4b14 | 405 | struct file_notify_information *pnotify; |
1da177e4 | 406 | __u32 data_offset = 0; |
820a803f | 407 | if (get_bcc(buf) > sizeof(struct file_notify_information)) { |
1da177e4 LT |
408 | data_offset = le32_to_cpu(pSMBr->DataOffset); |
409 | ||
3979877e SF |
410 | pnotify = (struct file_notify_information *) |
411 | ((char *)&pSMBr->hdr.Protocol + data_offset); | |
f96637be | 412 | cifs_dbg(FYI, "dnotify on %s Action: 0x%x\n", |
b6b38f70 | 413 | pnotify->FileName, pnotify->Action); |
fb8c4b14 | 414 | /* cifs_dump_mem("Rcvd notify Data: ",buf, |
3979877e | 415 | sizeof(struct smb_hdr)+60); */ |
4b18f2a9 | 416 | return true; |
1da177e4 | 417 | } |
790fe579 | 418 | if (pSMBr->hdr.Status.CifsError) { |
59b04c5d | 419 | cifs_dbg(FYI, "notify err 0x%x\n", |
f96637be | 420 | pSMBr->hdr.Status.CifsError); |
4b18f2a9 | 421 | return true; |
1da177e4 | 422 | } |
4b18f2a9 | 423 | return false; |
fb8c4b14 | 424 | } |
790fe579 | 425 | if (pSMB->hdr.Command != SMB_COM_LOCKING_ANDX) |
4b18f2a9 | 426 | return false; |
790fe579 | 427 | if (pSMB->hdr.Flags & SMBFLG_RESPONSE) { |
1da177e4 LT |
428 | /* no sense logging error on invalid handle on oplock |
429 | break - harmless race between close request and oplock | |
430 | break response is expected from time to time writing out | |
431 | large dirty files cached on the client */ | |
fb8c4b14 SF |
432 | if ((NT_STATUS_INVALID_HANDLE) == |
433 | le32_to_cpu(pSMB->hdr.Status.CifsError)) { | |
f96637be | 434 | cifs_dbg(FYI, "invalid handle on oplock break\n"); |
4b18f2a9 | 435 | return true; |
fb8c4b14 | 436 | } else if (ERRbadfid == |
1da177e4 | 437 | le16_to_cpu(pSMB->hdr.Status.DosError.Error)) { |
4b18f2a9 | 438 | return true; |
1da177e4 | 439 | } else { |
4b18f2a9 | 440 | return false; /* on valid oplock brk we get "request" */ |
1da177e4 LT |
441 | } |
442 | } | |
790fe579 | 443 | if (pSMB->hdr.WordCount != 8) |
4b18f2a9 | 444 | return false; |
1da177e4 | 445 | |
59b04c5d | 446 | cifs_dbg(FYI, "oplock type 0x%x level 0x%x\n", |
b6b38f70 | 447 | pSMB->LockType, pSMB->OplockLevel); |
790fe579 | 448 | if (!(pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE)) |
4b18f2a9 | 449 | return false; |
1da177e4 LT |
450 | |
451 | /* look up tcon based on tid & uid */ | |
3f9bcca7 | 452 | spin_lock(&cifs_tcp_ses_lock); |
f1987b44 | 453 | list_for_each(tmp, &srv->smb_ses_list) { |
96daf2b0 | 454 | ses = list_entry(tmp, struct cifs_ses, smb_ses_list); |
f1987b44 | 455 | list_for_each(tmp1, &ses->tcon_list) { |
96daf2b0 | 456 | tcon = list_entry(tmp1, struct cifs_tcon, tcon_list); |
f1987b44 JL |
457 | if (tcon->tid != buf->Tid) |
458 | continue; | |
459 | ||
44c58186 | 460 | cifs_stats_inc(&tcon->stats.cifs_stats.num_oplock_brks); |
3afca265 | 461 | spin_lock(&tcon->open_file_lock); |
f1987b44 JL |
462 | list_for_each(tmp2, &tcon->openFileList) { |
463 | netfile = list_entry(tmp2, struct cifsFileInfo, | |
57337e42 | 464 | tlist); |
4b4de76e | 465 | if (pSMB->Fid != netfile->fid.netfid) |
f1987b44 JL |
466 | continue; |
467 | ||
f96637be | 468 | cifs_dbg(FYI, "file id match, oplock break\n"); |
2b0143b5 | 469 | pCifsInode = CIFS_I(d_inode(netfile->dentry)); |
9b646972 | 470 | |
c11f1df5 SP |
471 | set_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, |
472 | &pCifsInode->flags); | |
473 | ||
474 | /* | |
475 | * Set flag if the server downgrades the oplock | |
476 | * to L2 else clear. | |
477 | */ | |
478 | if (pSMB->OplockLevel) | |
479 | set_bit( | |
480 | CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2, | |
481 | &pCifsInode->flags); | |
482 | else | |
483 | clear_bit( | |
484 | CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2, | |
485 | &pCifsInode->flags); | |
486 | ||
3998e6b8 | 487 | queue_work(cifsoplockd_wq, |
ad635942 | 488 | &netfile->oplock_break); |
9b646972 TH |
489 | netfile->oplock_break_cancelled = false; |
490 | ||
3afca265 | 491 | spin_unlock(&tcon->open_file_lock); |
3f9bcca7 | 492 | spin_unlock(&cifs_tcp_ses_lock); |
f1987b44 | 493 | return true; |
1da177e4 | 494 | } |
3afca265 | 495 | spin_unlock(&tcon->open_file_lock); |
3f9bcca7 | 496 | spin_unlock(&cifs_tcp_ses_lock); |
f96637be | 497 | cifs_dbg(FYI, "No matching file for oplock break\n"); |
4b18f2a9 | 498 | return true; |
1da177e4 LT |
499 | } |
500 | } | |
3f9bcca7 | 501 | spin_unlock(&cifs_tcp_ses_lock); |
f96637be | 502 | cifs_dbg(FYI, "Can not process oplock break for non-existent connection\n"); |
4b18f2a9 | 503 | return true; |
1da177e4 LT |
504 | } |
505 | ||
506 | void | |
792af7b0 | 507 | dump_smb(void *buf, int smb_buf_length) |
1da177e4 | 508 | { |
1da177e4 LT |
509 | if (traceSMB == 0) |
510 | return; | |
511 | ||
55d83e0d AS |
512 | print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_NONE, 8, 2, buf, |
513 | smb_buf_length, true); | |
1da177e4 | 514 | } |
6a0b4824 | 515 | |
ec06aedd JL |
516 | void |
517 | cifs_autodisable_serverino(struct cifs_sb_info *cifs_sb) | |
518 | { | |
519 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) { | |
f534dc99 | 520 | cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM; |
f96637be JP |
521 | cifs_dbg(VFS, "Autodisabling the use of server inode numbers on %s. This server doesn't seem to support them properly. Hardlinks will not be recognized on this mount. Consider mounting with the \"noserverino\" option to silence this message.\n", |
522 | cifs_sb_master_tcon(cifs_sb)->treeName); | |
ec06aedd JL |
523 | } |
524 | } | |
e66673e3 | 525 | |
c6723628 | 526 | void cifs_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock) |
e66673e3 | 527 | { |
c6723628 | 528 | oplock &= 0xF; |
e66673e3 | 529 | |
c6723628 | 530 | if (oplock == OPLOCK_EXCLUSIVE) { |
18cceb6a | 531 | cinode->oplock = CIFS_CACHE_WRITE_FLG | CIFS_CACHE_READ_FLG; |
f96637be JP |
532 | cifs_dbg(FYI, "Exclusive Oplock granted on inode %p\n", |
533 | &cinode->vfs_inode); | |
c6723628 | 534 | } else if (oplock == OPLOCK_READ) { |
18cceb6a | 535 | cinode->oplock = CIFS_CACHE_READ_FLG; |
f96637be JP |
536 | cifs_dbg(FYI, "Level II Oplock granted on inode %p\n", |
537 | &cinode->vfs_inode); | |
18cceb6a PS |
538 | } else |
539 | cinode->oplock = 0; | |
e66673e3 | 540 | } |
3d3ea8e6 | 541 | |
c11f1df5 SP |
542 | /* |
543 | * We wait for oplock breaks to be processed before we attempt to perform | |
544 | * writes. | |
545 | */ | |
546 | int cifs_get_writer(struct cifsInodeInfo *cinode) | |
547 | { | |
548 | int rc; | |
549 | ||
550 | start: | |
551 | rc = wait_on_bit(&cinode->flags, CIFS_INODE_PENDING_OPLOCK_BREAK, | |
74316201 | 552 | TASK_KILLABLE); |
c11f1df5 SP |
553 | if (rc) |
554 | return rc; | |
555 | ||
556 | spin_lock(&cinode->writers_lock); | |
557 | if (!cinode->writers) | |
558 | set_bit(CIFS_INODE_PENDING_WRITERS, &cinode->flags); | |
559 | cinode->writers++; | |
560 | /* Check to see if we have started servicing an oplock break */ | |
561 | if (test_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, &cinode->flags)) { | |
562 | cinode->writers--; | |
563 | if (cinode->writers == 0) { | |
564 | clear_bit(CIFS_INODE_PENDING_WRITERS, &cinode->flags); | |
565 | wake_up_bit(&cinode->flags, CIFS_INODE_PENDING_WRITERS); | |
566 | } | |
567 | spin_unlock(&cinode->writers_lock); | |
568 | goto start; | |
569 | } | |
570 | spin_unlock(&cinode->writers_lock); | |
571 | return 0; | |
572 | } | |
573 | ||
574 | void cifs_put_writer(struct cifsInodeInfo *cinode) | |
575 | { | |
576 | spin_lock(&cinode->writers_lock); | |
577 | cinode->writers--; | |
578 | if (cinode->writers == 0) { | |
579 | clear_bit(CIFS_INODE_PENDING_WRITERS, &cinode->flags); | |
580 | wake_up_bit(&cinode->flags, CIFS_INODE_PENDING_WRITERS); | |
581 | } | |
582 | spin_unlock(&cinode->writers_lock); | |
583 | } | |
584 | ||
585 | void cifs_done_oplock_break(struct cifsInodeInfo *cinode) | |
586 | { | |
587 | clear_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, &cinode->flags); | |
588 | wake_up_bit(&cinode->flags, CIFS_INODE_PENDING_OPLOCK_BREAK); | |
589 | } | |
590 | ||
3d3ea8e6 SP |
591 | bool |
592 | backup_cred(struct cifs_sb_info *cifs_sb) | |
593 | { | |
594 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID) { | |
1f68233c | 595 | if (uid_eq(cifs_sb->mnt_backupuid, current_fsuid())) |
3d3ea8e6 SP |
596 | return true; |
597 | } | |
598 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID) { | |
599 | if (in_group_p(cifs_sb->mnt_backupgid)) | |
600 | return true; | |
601 | } | |
602 | ||
603 | return false; | |
604 | } | |
233839b1 PS |
605 | |
606 | void | |
607 | cifs_del_pending_open(struct cifs_pending_open *open) | |
608 | { | |
3afca265 | 609 | spin_lock(&tlink_tcon(open->tlink)->open_file_lock); |
233839b1 | 610 | list_del(&open->olist); |
3afca265 | 611 | spin_unlock(&tlink_tcon(open->tlink)->open_file_lock); |
233839b1 PS |
612 | } |
613 | ||
614 | void | |
615 | cifs_add_pending_open_locked(struct cifs_fid *fid, struct tcon_link *tlink, | |
616 | struct cifs_pending_open *open) | |
617 | { | |
233839b1 | 618 | memcpy(open->lease_key, fid->lease_key, SMB2_LEASE_KEY_SIZE); |
233839b1 PS |
619 | open->oplock = CIFS_OPLOCK_NO_CHANGE; |
620 | open->tlink = tlink; | |
621 | fid->pending_open = open; | |
622 | list_add_tail(&open->olist, &tlink_tcon(tlink)->pending_opens); | |
623 | } | |
624 | ||
625 | void | |
626 | cifs_add_pending_open(struct cifs_fid *fid, struct tcon_link *tlink, | |
627 | struct cifs_pending_open *open) | |
628 | { | |
3afca265 | 629 | spin_lock(&tlink_tcon(tlink)->open_file_lock); |
233839b1 | 630 | cifs_add_pending_open_locked(fid, tlink, open); |
3afca265 | 631 | spin_unlock(&tlink_tcon(open->tlink)->open_file_lock); |
233839b1 | 632 | } |
4ecce920 AA |
633 | |
634 | /* parses DFS refferal V3 structure | |
635 | * caller is responsible for freeing target_nodes | |
636 | * returns: | |
637 | * - on success - 0 | |
638 | * - on failure - errno | |
639 | */ | |
640 | int | |
641 | parse_dfs_referrals(struct get_dfs_referral_rsp *rsp, u32 rsp_size, | |
642 | unsigned int *num_of_nodes, | |
643 | struct dfs_info3_param **target_nodes, | |
644 | const struct nls_table *nls_codepage, int remap, | |
645 | const char *searchName, bool is_unicode) | |
646 | { | |
647 | int i, rc = 0; | |
648 | char *data_end; | |
649 | struct dfs_referral_level_3 *ref; | |
650 | ||
651 | *num_of_nodes = le16_to_cpu(rsp->NumberOfReferrals); | |
652 | ||
653 | if (*num_of_nodes < 1) { | |
654 | cifs_dbg(VFS, "num_referrals: must be at least > 0, but we get num_referrals = %d\n", | |
655 | *num_of_nodes); | |
656 | rc = -EINVAL; | |
657 | goto parse_DFS_referrals_exit; | |
658 | } | |
659 | ||
660 | ref = (struct dfs_referral_level_3 *) &(rsp->referrals); | |
661 | if (ref->VersionNumber != cpu_to_le16(3)) { | |
662 | cifs_dbg(VFS, "Referrals of V%d version are not supported, should be V3\n", | |
663 | le16_to_cpu(ref->VersionNumber)); | |
664 | rc = -EINVAL; | |
665 | goto parse_DFS_referrals_exit; | |
666 | } | |
667 | ||
668 | /* get the upper boundary of the resp buffer */ | |
669 | data_end = (char *)rsp + rsp_size; | |
670 | ||
671 | cifs_dbg(FYI, "num_referrals: %d dfs flags: 0x%x ...\n", | |
672 | *num_of_nodes, le32_to_cpu(rsp->DFSFlags)); | |
673 | ||
674 | *target_nodes = kcalloc(*num_of_nodes, sizeof(struct dfs_info3_param), | |
675 | GFP_KERNEL); | |
676 | if (*target_nodes == NULL) { | |
677 | rc = -ENOMEM; | |
678 | goto parse_DFS_referrals_exit; | |
679 | } | |
680 | ||
681 | /* collect necessary data from referrals */ | |
682 | for (i = 0; i < *num_of_nodes; i++) { | |
683 | char *temp; | |
684 | int max_len; | |
685 | struct dfs_info3_param *node = (*target_nodes)+i; | |
686 | ||
687 | node->flags = le32_to_cpu(rsp->DFSFlags); | |
688 | if (is_unicode) { | |
689 | __le16 *tmp = kmalloc(strlen(searchName)*2 + 2, | |
690 | GFP_KERNEL); | |
691 | if (tmp == NULL) { | |
692 | rc = -ENOMEM; | |
693 | goto parse_DFS_referrals_exit; | |
694 | } | |
695 | cifsConvertToUTF16((__le16 *) tmp, searchName, | |
696 | PATH_MAX, nls_codepage, remap); | |
697 | node->path_consumed = cifs_utf16_bytes(tmp, | |
698 | le16_to_cpu(rsp->PathConsumed), | |
699 | nls_codepage); | |
700 | kfree(tmp); | |
701 | } else | |
702 | node->path_consumed = le16_to_cpu(rsp->PathConsumed); | |
703 | ||
704 | node->server_type = le16_to_cpu(ref->ServerType); | |
705 | node->ref_flag = le16_to_cpu(ref->ReferralEntryFlags); | |
706 | ||
707 | /* copy DfsPath */ | |
708 | temp = (char *)ref + le16_to_cpu(ref->DfsPathOffset); | |
709 | max_len = data_end - temp; | |
710 | node->path_name = cifs_strndup_from_utf16(temp, max_len, | |
711 | is_unicode, nls_codepage); | |
712 | if (!node->path_name) { | |
713 | rc = -ENOMEM; | |
714 | goto parse_DFS_referrals_exit; | |
715 | } | |
716 | ||
717 | /* copy link target UNC */ | |
718 | temp = (char *)ref + le16_to_cpu(ref->NetworkAddressOffset); | |
719 | max_len = data_end - temp; | |
720 | node->node_name = cifs_strndup_from_utf16(temp, max_len, | |
721 | is_unicode, nls_codepage); | |
722 | if (!node->node_name) { | |
723 | rc = -ENOMEM; | |
724 | goto parse_DFS_referrals_exit; | |
725 | } | |
726 | ||
727 | ref++; | |
728 | } | |
729 | ||
730 | parse_DFS_referrals_exit: | |
731 | if (rc) { | |
732 | free_dfs_info_array(*target_nodes, *num_of_nodes); | |
733 | *target_nodes = NULL; | |
734 | *num_of_nodes = 0; | |
735 | } | |
736 | return rc; | |
737 | } | |
ccf7f408 PS |
738 | |
739 | struct cifs_aio_ctx * | |
740 | cifs_aio_ctx_alloc(void) | |
741 | { | |
742 | struct cifs_aio_ctx *ctx; | |
743 | ||
744 | ctx = kzalloc(sizeof(struct cifs_aio_ctx), GFP_KERNEL); | |
745 | if (!ctx) | |
746 | return NULL; | |
747 | ||
748 | INIT_LIST_HEAD(&ctx->list); | |
749 | mutex_init(&ctx->aio_mutex); | |
750 | init_completion(&ctx->done); | |
751 | kref_init(&ctx->refcount); | |
752 | return ctx; | |
753 | } | |
754 | ||
755 | void | |
756 | cifs_aio_ctx_release(struct kref *refcount) | |
757 | { | |
758 | struct cifs_aio_ctx *ctx = container_of(refcount, | |
759 | struct cifs_aio_ctx, refcount); | |
760 | ||
761 | cifsFileInfo_put(ctx->cfile); | |
762 | kvfree(ctx->bv); | |
763 | kfree(ctx); | |
764 | } | |
765 | ||
766 | #define CIFS_AIO_KMALLOC_LIMIT (1024 * 1024) | |
767 | ||
768 | int | |
769 | setup_aio_ctx_iter(struct cifs_aio_ctx *ctx, struct iov_iter *iter, int rw) | |
770 | { | |
771 | ssize_t rc; | |
772 | unsigned int cur_npages; | |
773 | unsigned int npages = 0; | |
774 | unsigned int i; | |
775 | size_t len; | |
776 | size_t count = iov_iter_count(iter); | |
777 | unsigned int saved_len; | |
778 | size_t start; | |
779 | unsigned int max_pages = iov_iter_npages(iter, INT_MAX); | |
780 | struct page **pages = NULL; | |
781 | struct bio_vec *bv = NULL; | |
782 | ||
783 | if (iter->type & ITER_KVEC) { | |
784 | memcpy(&ctx->iter, iter, sizeof(struct iov_iter)); | |
785 | ctx->len = count; | |
786 | iov_iter_advance(iter, count); | |
787 | return 0; | |
788 | } | |
789 | ||
790 | if (max_pages * sizeof(struct bio_vec) <= CIFS_AIO_KMALLOC_LIMIT) | |
791 | bv = kmalloc_array(max_pages, sizeof(struct bio_vec), | |
792 | GFP_KERNEL); | |
793 | ||
794 | if (!bv) { | |
795 | bv = vmalloc(max_pages * sizeof(struct bio_vec)); | |
796 | if (!bv) | |
797 | return -ENOMEM; | |
798 | } | |
799 | ||
800 | if (max_pages * sizeof(struct page *) <= CIFS_AIO_KMALLOC_LIMIT) | |
801 | pages = kmalloc_array(max_pages, sizeof(struct page *), | |
802 | GFP_KERNEL); | |
803 | ||
804 | if (!pages) { | |
805 | pages = vmalloc(max_pages * sizeof(struct page *)); | |
ecf3411a | 806 | if (!pages) { |
ccf7f408 PS |
807 | kvfree(bv); |
808 | return -ENOMEM; | |
809 | } | |
810 | } | |
811 | ||
812 | saved_len = count; | |
813 | ||
814 | while (count && npages < max_pages) { | |
815 | rc = iov_iter_get_pages(iter, pages, count, max_pages, &start); | |
816 | if (rc < 0) { | |
817 | cifs_dbg(VFS, "couldn't get user pages (rc=%zd)\n", rc); | |
818 | break; | |
819 | } | |
820 | ||
821 | if (rc > count) { | |
822 | cifs_dbg(VFS, "get pages rc=%zd more than %zu\n", rc, | |
823 | count); | |
824 | break; | |
825 | } | |
826 | ||
827 | iov_iter_advance(iter, rc); | |
828 | count -= rc; | |
829 | rc += start; | |
830 | cur_npages = DIV_ROUND_UP(rc, PAGE_SIZE); | |
831 | ||
832 | if (npages + cur_npages > max_pages) { | |
833 | cifs_dbg(VFS, "out of vec array capacity (%u vs %u)\n", | |
834 | npages + cur_npages, max_pages); | |
835 | break; | |
836 | } | |
837 | ||
838 | for (i = 0; i < cur_npages; i++) { | |
839 | len = rc > PAGE_SIZE ? PAGE_SIZE : rc; | |
840 | bv[npages + i].bv_page = pages[i]; | |
841 | bv[npages + i].bv_offset = start; | |
842 | bv[npages + i].bv_len = len - start; | |
843 | rc -= len; | |
844 | start = 0; | |
845 | } | |
846 | ||
847 | npages += cur_npages; | |
848 | } | |
849 | ||
850 | kvfree(pages); | |
851 | ctx->bv = bv; | |
852 | ctx->len = saved_len - count; | |
853 | ctx->npages = npages; | |
854 | iov_iter_bvec(&ctx->iter, ITER_BVEC | rw, ctx->bv, npages, ctx->len); | |
855 | return 0; | |
856 | } |