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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 PS |
33 | #ifdef CONFIG_CIFS_SMB2 |
34 | #include "smb2pdu.h" | |
35 | #endif | |
1da177e4 LT |
36 | |
37 | extern mempool_t *cifs_sm_req_poolp; | |
38 | extern mempool_t *cifs_req_poolp; | |
1da177e4 | 39 | |
fb8c4b14 SF |
40 | /* The xid serves as a useful identifier for each incoming vfs request, |
41 | in a similar way to the mid which is useful to track each sent smb, | |
42 | and CurrentXid can also provide a running counter (although it | |
43 | will eventually wrap past zero) of the total vfs operations handled | |
1da177e4 LT |
44 | since the cifs fs was mounted */ |
45 | ||
46 | unsigned int | |
6d5786a3 | 47 | _get_xid(void) |
1da177e4 LT |
48 | { |
49 | unsigned int xid; | |
50 | ||
51 | spin_lock(&GlobalMid_Lock); | |
52 | GlobalTotalActiveXid++; | |
50c2f753 SF |
53 | |
54 | /* keep high water mark for number of simultaneous ops in filesystem */ | |
1da177e4 | 55 | if (GlobalTotalActiveXid > GlobalMaxActiveXid) |
50c2f753 | 56 | GlobalMaxActiveXid = GlobalTotalActiveXid; |
790fe579 | 57 | if (GlobalTotalActiveXid > 65000) |
f96637be | 58 | cifs_dbg(FYI, "warning: more than 65000 requests active\n"); |
1da177e4 LT |
59 | xid = GlobalCurrentXid++; |
60 | spin_unlock(&GlobalMid_Lock); | |
61 | return xid; | |
62 | } | |
63 | ||
64 | void | |
6d5786a3 | 65 | _free_xid(unsigned int xid) |
1da177e4 LT |
66 | { |
67 | spin_lock(&GlobalMid_Lock); | |
790fe579 | 68 | /* if (GlobalTotalActiveXid == 0) |
1da177e4 LT |
69 | BUG(); */ |
70 | GlobalTotalActiveXid--; | |
71 | spin_unlock(&GlobalMid_Lock); | |
72 | } | |
73 | ||
96daf2b0 | 74 | struct cifs_ses * |
1da177e4 LT |
75 | sesInfoAlloc(void) |
76 | { | |
96daf2b0 | 77 | struct cifs_ses *ret_buf; |
1da177e4 | 78 | |
96daf2b0 | 79 | ret_buf = kzalloc(sizeof(struct cifs_ses), GFP_KERNEL); |
1da177e4 | 80 | if (ret_buf) { |
1da177e4 LT |
81 | atomic_inc(&sesInfoAllocCount); |
82 | ret_buf->status = CifsNew; | |
14fbf50d JL |
83 | ++ret_buf->ses_count; |
84 | INIT_LIST_HEAD(&ret_buf->smb_ses_list); | |
f1987b44 | 85 | INIT_LIST_HEAD(&ret_buf->tcon_list); |
d7b619cf | 86 | mutex_init(&ret_buf->session_mutex); |
1da177e4 LT |
87 | } |
88 | return ret_buf; | |
89 | } | |
90 | ||
91 | void | |
96daf2b0 | 92 | sesInfoFree(struct cifs_ses *buf_to_free) |
1da177e4 LT |
93 | { |
94 | if (buf_to_free == NULL) { | |
f96637be | 95 | cifs_dbg(FYI, "Null buffer passed to sesInfoFree\n"); |
1da177e4 LT |
96 | return; |
97 | } | |
98 | ||
1da177e4 | 99 | atomic_dec(&sesInfoAllocCount); |
f99d49ad JJ |
100 | kfree(buf_to_free->serverOS); |
101 | kfree(buf_to_free->serverDomain); | |
102 | kfree(buf_to_free->serverNOS); | |
55162dec JL |
103 | if (buf_to_free->password) { |
104 | memset(buf_to_free->password, 0, strlen(buf_to_free->password)); | |
105 | kfree(buf_to_free->password); | |
106 | } | |
8727c8a8 | 107 | kfree(buf_to_free->user_name); |
3979877e | 108 | kfree(buf_to_free->domainName); |
d4e63bd6 | 109 | kfree(buf_to_free->auth_key.response); |
1da177e4 LT |
110 | kfree(buf_to_free); |
111 | } | |
112 | ||
96daf2b0 | 113 | struct cifs_tcon * |
1da177e4 LT |
114 | tconInfoAlloc(void) |
115 | { | |
96daf2b0 SF |
116 | struct cifs_tcon *ret_buf; |
117 | ret_buf = kzalloc(sizeof(struct cifs_tcon), GFP_KERNEL); | |
1da177e4 | 118 | if (ret_buf) { |
1da177e4 | 119 | atomic_inc(&tconInfoAllocCount); |
1da177e4 | 120 | ret_buf->tidStatus = CifsNew; |
f1987b44 | 121 | ++ret_buf->tc_count; |
1da177e4 | 122 | INIT_LIST_HEAD(&ret_buf->openFileList); |
f1987b44 | 123 | INIT_LIST_HEAD(&ret_buf->tcon_list); |
3afca265 | 124 | spin_lock_init(&ret_buf->open_file_lock); |
1da177e4 LT |
125 | #ifdef CONFIG_CIFS_STATS |
126 | spin_lock_init(&ret_buf->stat_lock); | |
127 | #endif | |
1da177e4 LT |
128 | } |
129 | return ret_buf; | |
130 | } | |
131 | ||
132 | void | |
96daf2b0 | 133 | tconInfoFree(struct cifs_tcon *buf_to_free) |
1da177e4 LT |
134 | { |
135 | if (buf_to_free == NULL) { | |
f96637be | 136 | cifs_dbg(FYI, "Null buffer passed to tconInfoFree\n"); |
1da177e4 LT |
137 | return; |
138 | } | |
1da177e4 | 139 | atomic_dec(&tconInfoAllocCount); |
f99d49ad | 140 | kfree(buf_to_free->nativeFileSystem); |
00e485b0 JL |
141 | if (buf_to_free->password) { |
142 | memset(buf_to_free->password, 0, strlen(buf_to_free->password)); | |
143 | kfree(buf_to_free->password); | |
144 | } | |
1da177e4 LT |
145 | kfree(buf_to_free); |
146 | } | |
147 | ||
148 | struct smb_hdr * | |
149 | cifs_buf_get(void) | |
150 | { | |
151 | struct smb_hdr *ret_buf = NULL; | |
3792c173 PS |
152 | size_t buf_size = sizeof(struct smb_hdr); |
153 | ||
154 | #ifdef CONFIG_CIFS_SMB2 | |
155 | /* | |
156 | * SMB2 header is bigger than CIFS one - no problems to clean some | |
157 | * more bytes for CIFS. | |
158 | */ | |
159 | buf_size = sizeof(struct smb2_hdr); | |
160 | #endif | |
161 | /* | |
162 | * We could use negotiated size instead of max_msgsize - | |
163 | * but it may be more efficient to always alloc same size | |
164 | * albeit slightly larger than necessary and maxbuffersize | |
165 | * defaults to this and can not be bigger. | |
166 | */ | |
232087cb | 167 | ret_buf = mempool_alloc(cifs_req_poolp, GFP_NOFS); |
1da177e4 LT |
168 | |
169 | /* clear the first few header bytes */ | |
170 | /* for most paths, more is cleared in header_assemble */ | |
a6f74e80 N |
171 | memset(ret_buf, 0, buf_size + 3); |
172 | atomic_inc(&bufAllocCount); | |
4498eed5 | 173 | #ifdef CONFIG_CIFS_STATS2 |
a6f74e80 | 174 | atomic_inc(&totBufAllocCount); |
4498eed5 | 175 | #endif /* CONFIG_CIFS_STATS2 */ |
1da177e4 LT |
176 | |
177 | return ret_buf; | |
178 | } | |
179 | ||
180 | void | |
181 | cifs_buf_release(void *buf_to_free) | |
182 | { | |
1da177e4 | 183 | if (buf_to_free == NULL) { |
f96637be | 184 | /* cifs_dbg(FYI, "Null buffer passed to cifs_buf_release\n");*/ |
1da177e4 LT |
185 | return; |
186 | } | |
fb8c4b14 | 187 | mempool_free(buf_to_free, cifs_req_poolp); |
1da177e4 LT |
188 | |
189 | atomic_dec(&bufAllocCount); | |
190 | return; | |
191 | } | |
192 | ||
193 | struct smb_hdr * | |
194 | cifs_small_buf_get(void) | |
195 | { | |
196 | struct smb_hdr *ret_buf = NULL; | |
197 | ||
fb8c4b14 SF |
198 | /* We could use negotiated size instead of max_msgsize - |
199 | but it may be more efficient to always alloc same size | |
200 | albeit slightly larger than necessary and maxbuffersize | |
1da177e4 | 201 | defaults to this and can not be bigger */ |
232087cb | 202 | ret_buf = mempool_alloc(cifs_sm_req_poolp, GFP_NOFS); |
1da177e4 LT |
203 | /* No need to clear memory here, cleared in header assemble */ |
204 | /* memset(ret_buf, 0, sizeof(struct smb_hdr) + 27);*/ | |
a6f74e80 | 205 | atomic_inc(&smBufAllocCount); |
4498eed5 | 206 | #ifdef CONFIG_CIFS_STATS2 |
a6f74e80 | 207 | atomic_inc(&totSmBufAllocCount); |
4498eed5 SF |
208 | #endif /* CONFIG_CIFS_STATS2 */ |
209 | ||
1da177e4 LT |
210 | return ret_buf; |
211 | } | |
212 | ||
213 | void | |
214 | cifs_small_buf_release(void *buf_to_free) | |
215 | { | |
216 | ||
217 | if (buf_to_free == NULL) { | |
f96637be | 218 | cifs_dbg(FYI, "Null buffer passed to cifs_small_buf_release\n"); |
1da177e4 LT |
219 | return; |
220 | } | |
fb8c4b14 | 221 | mempool_free(buf_to_free, cifs_sm_req_poolp); |
1da177e4 LT |
222 | |
223 | atomic_dec(&smBufAllocCount); | |
224 | return; | |
225 | } | |
226 | ||
6d81ed1e SP |
227 | void |
228 | free_rsp_buf(int resp_buftype, void *rsp) | |
229 | { | |
230 | if (resp_buftype == CIFS_SMALL_BUFFER) | |
231 | cifs_small_buf_release(rsp); | |
232 | else if (resp_buftype == CIFS_LARGE_BUFFER) | |
233 | cifs_buf_release(rsp); | |
234 | } | |
235 | ||
1982c344 SF |
236 | /* NB: MID can not be set if treeCon not passed in, in that |
237 | case it is responsbility of caller to set the mid */ | |
1da177e4 LT |
238 | void |
239 | header_assemble(struct smb_hdr *buffer, char smb_command /* command */ , | |
96daf2b0 | 240 | const struct cifs_tcon *treeCon, int word_count |
1da177e4 LT |
241 | /* length of fixed section (word count) in two byte units */) |
242 | { | |
1da177e4 LT |
243 | char *temp = (char *) buffer; |
244 | ||
fb8c4b14 | 245 | memset(temp, 0, 256); /* bigger than MAX_CIFS_HDR_SIZE */ |
1da177e4 | 246 | |
be8e3b00 | 247 | buffer->smb_buf_length = cpu_to_be32( |
630f3f0c | 248 | (2 * word_count) + sizeof(struct smb_hdr) - |
1da177e4 | 249 | 4 /* RFC 1001 length field does not count */ + |
be8e3b00 | 250 | 2 /* for bcc field itself */) ; |
1da177e4 LT |
251 | |
252 | buffer->Protocol[0] = 0xFF; | |
253 | buffer->Protocol[1] = 'S'; | |
254 | buffer->Protocol[2] = 'M'; | |
255 | buffer->Protocol[3] = 'B'; | |
256 | buffer->Command = smb_command; | |
257 | buffer->Flags = 0x00; /* case sensitive */ | |
258 | buffer->Flags2 = SMBFLG2_KNOWS_LONG_NAMES; | |
259 | buffer->Pid = cpu_to_le16((__u16)current->tgid); | |
260 | buffer->PidHigh = cpu_to_le16((__u16)(current->tgid >> 16)); | |
1da177e4 LT |
261 | if (treeCon) { |
262 | buffer->Tid = treeCon->tid; | |
263 | if (treeCon->ses) { | |
264 | if (treeCon->ses->capabilities & CAP_UNICODE) | |
265 | buffer->Flags2 |= SMBFLG2_UNICODE; | |
ad7a2926 | 266 | if (treeCon->ses->capabilities & CAP_STATUS32) |
1da177e4 | 267 | buffer->Flags2 |= SMBFLG2_ERR_STATUS; |
ad7a2926 | 268 | |
1982c344 SF |
269 | /* Uid is not converted */ |
270 | buffer->Uid = treeCon->ses->Suid; | |
88257360 | 271 | buffer->Mid = get_next_mid(treeCon->ses->server); |
1da177e4 LT |
272 | } |
273 | if (treeCon->Flags & SMB_SHARE_IS_IN_DFS) | |
274 | buffer->Flags2 |= SMBFLG2_DFS; | |
d3485d37 SF |
275 | if (treeCon->nocase) |
276 | buffer->Flags |= SMBFLG_CASELESS; | |
790fe579 | 277 | if ((treeCon->ses) && (treeCon->ses->server)) |
38d77c50 | 278 | if (treeCon->ses->server->sign) |
1da177e4 LT |
279 | buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE; |
280 | } | |
281 | ||
282 | /* endian conversion of flags is now done just before sending */ | |
283 | buffer->WordCount = (char) word_count; | |
284 | return; | |
285 | } | |
286 | ||
2cd646a2 | 287 | static int |
944d6f1a | 288 | check_smb_hdr(struct smb_hdr *smb) |
1da177e4 | 289 | { |
68abaffa JL |
290 | /* does it have the right SMB "signature" ? */ |
291 | if (*(__le32 *) smb->Protocol != cpu_to_le32(0x424d53ff)) { | |
f96637be JP |
292 | cifs_dbg(VFS, "Bad protocol string signature header 0x%x\n", |
293 | *(unsigned int *)smb->Protocol); | |
68abaffa JL |
294 | return 1; |
295 | } | |
296 | ||
68abaffa JL |
297 | /* if it's a response then accept */ |
298 | if (smb->Flags & SMBFLG_RESPONSE) | |
299 | return 0; | |
300 | ||
301 | /* only one valid case where server sends us request */ | |
302 | if (smb->Command == SMB_COM_LOCKING_ANDX) | |
303 | return 0; | |
304 | ||
3d378d3f TG |
305 | cifs_dbg(VFS, "Server sent request, not response. mid=%u\n", |
306 | get_mid(smb)); | |
1da177e4 LT |
307 | return 1; |
308 | } | |
309 | ||
310 | int | |
373512ec | 311 | checkSMB(char *buf, unsigned int total_read, struct TCP_Server_Info *server) |
1da177e4 | 312 | { |
d4e4854f | 313 | struct smb_hdr *smb = (struct smb_hdr *)buf; |
376b43f4 | 314 | __u32 rfclen = be32_to_cpu(smb->smb_buf_length); |
190fdeb8 | 315 | __u32 clc_len; /* calculated length */ |
f96637be JP |
316 | cifs_dbg(FYI, "checkSMB Length: 0x%x, smb_buf_length: 0x%x\n", |
317 | total_read, rfclen); | |
d103e164 | 318 | |
376b43f4 JL |
319 | /* is this frame too small to even get to a BCC? */ |
320 | if (total_read < 2 + sizeof(struct smb_hdr)) { | |
321 | if ((total_read >= sizeof(struct smb_hdr) - 1) | |
1da177e4 | 322 | && (smb->Status.CifsError != 0)) { |
376b43f4 | 323 | /* it's an error return */ |
d103e164 SF |
324 | smb->WordCount = 0; |
325 | /* some error cases do not return wct and bcc */ | |
326 | return 0; | |
376b43f4 | 327 | } else if ((total_read == sizeof(struct smb_hdr) + 1) && |
d103e164 | 328 | (smb->WordCount == 0)) { |
fb8c4b14 | 329 | char *tmp = (char *)smb; |
d103e164 SF |
330 | /* Need to work around a bug in two servers here */ |
331 | /* First, check if the part of bcc they sent was zero */ | |
332 | if (tmp[sizeof(struct smb_hdr)] == 0) { | |
333 | /* some servers return only half of bcc | |
334 | * on simple responses (wct, bcc both zero) | |
335 | * in particular have seen this on | |
336 | * ulogoffX and FindClose. This leaves | |
337 | * one byte of bcc potentially unitialized | |
338 | */ | |
339 | /* zero rest of bcc */ | |
340 | tmp[sizeof(struct smb_hdr)+1] = 0; | |
46c79a64 | 341 | return 0; |
1da177e4 | 342 | } |
f96637be | 343 | cifs_dbg(VFS, "rcvd invalid byte count (bcc)\n"); |
d103e164 | 344 | } else { |
f96637be | 345 | cifs_dbg(VFS, "Length less than smb header size\n"); |
1da177e4 | 346 | } |
376b43f4 | 347 | return -EIO; |
1da177e4 LT |
348 | } |
349 | ||
376b43f4 | 350 | /* otherwise, there is enough to get to the BCC */ |
944d6f1a | 351 | if (check_smb_hdr(smb)) |
376b43f4 | 352 | return -EIO; |
820a803f | 353 | clc_len = smbCalcSize(smb); |
184ed211 | 354 | |
376b43f4 | 355 | if (4 + rfclen != total_read) { |
f96637be JP |
356 | cifs_dbg(VFS, "Length read does not match RFC1001 length %d\n", |
357 | rfclen); | |
376b43f4 | 358 | return -EIO; |
184ed211 SF |
359 | } |
360 | ||
376b43f4 | 361 | if (4 + rfclen != clc_len) { |
3d378d3f | 362 | __u16 mid = get_mid(smb); |
184ed211 | 363 | /* check if bcc wrapped around for large read responses */ |
376b43f4 | 364 | if ((rfclen > 64 * 1024) && (rfclen > clc_len)) { |
184ed211 | 365 | /* check if lengths match mod 64K */ |
376b43f4 | 366 | if (((4 + rfclen) & 0xFFFF) == (clc_len & 0xFFFF)) |
fb8c4b14 | 367 | return 0; /* bcc wrapped */ |
184ed211 | 368 | } |
f96637be | 369 | cifs_dbg(FYI, "Calculated size %u vs length %u mismatch for mid=%u\n", |
3d378d3f | 370 | clc_len, 4 + rfclen, mid); |
6284644e | 371 | |
376b43f4 | 372 | if (4 + rfclen < clc_len) { |
f96637be | 373 | cifs_dbg(VFS, "RFC1001 size %u smaller than SMB for mid=%u\n", |
3d378d3f | 374 | rfclen, mid); |
376b43f4 JL |
375 | return -EIO; |
376 | } else if (rfclen > clc_len + 512) { | |
6284644e JL |
377 | /* |
378 | * Some servers (Windows XP in particular) send more | |
379 | * data than the lengths in the SMB packet would | |
380 | * indicate on certain calls (byte range locks and | |
381 | * trans2 find first calls in particular). While the | |
382 | * client can handle such a frame by ignoring the | |
383 | * trailing data, we choose limit the amount of extra | |
384 | * data to 512 bytes. | |
385 | */ | |
f96637be | 386 | cifs_dbg(VFS, "RFC1001 size %u more than 512 bytes larger than SMB for mid=%u\n", |
3d378d3f | 387 | rfclen, mid); |
376b43f4 | 388 | return -EIO; |
46c79a64 | 389 | } |
1da177e4 | 390 | } |
20962438 | 391 | return 0; |
1da177e4 | 392 | } |
4b18f2a9 SF |
393 | |
394 | bool | |
d4e4854f | 395 | is_valid_oplock_break(char *buffer, struct TCP_Server_Info *srv) |
fb8c4b14 | 396 | { |
d4e4854f | 397 | struct smb_hdr *buf = (struct smb_hdr *)buffer; |
fb8c4b14 | 398 | struct smb_com_lock_req *pSMB = (struct smb_com_lock_req *)buf; |
f1987b44 | 399 | struct list_head *tmp, *tmp1, *tmp2; |
96daf2b0 SF |
400 | struct cifs_ses *ses; |
401 | struct cifs_tcon *tcon; | |
f1987b44 | 402 | struct cifsInodeInfo *pCifsInode; |
1da177e4 LT |
403 | struct cifsFileInfo *netfile; |
404 | ||
f96637be | 405 | cifs_dbg(FYI, "Checking for oplock break or dnotify response\n"); |
790fe579 | 406 | if ((pSMB->hdr.Command == SMB_COM_NT_TRANSACT) && |
1da177e4 | 407 | (pSMB->hdr.Flags & SMBFLG_RESPONSE)) { |
fb8c4b14 | 408 | struct smb_com_transaction_change_notify_rsp *pSMBr = |
1da177e4 | 409 | (struct smb_com_transaction_change_notify_rsp *)buf; |
fb8c4b14 | 410 | struct file_notify_information *pnotify; |
1da177e4 | 411 | __u32 data_offset = 0; |
820a803f | 412 | if (get_bcc(buf) > sizeof(struct file_notify_information)) { |
1da177e4 LT |
413 | data_offset = le32_to_cpu(pSMBr->DataOffset); |
414 | ||
3979877e SF |
415 | pnotify = (struct file_notify_information *) |
416 | ((char *)&pSMBr->hdr.Protocol + data_offset); | |
f96637be | 417 | cifs_dbg(FYI, "dnotify on %s Action: 0x%x\n", |
b6b38f70 | 418 | pnotify->FileName, pnotify->Action); |
fb8c4b14 | 419 | /* cifs_dump_mem("Rcvd notify Data: ",buf, |
3979877e | 420 | sizeof(struct smb_hdr)+60); */ |
4b18f2a9 | 421 | return true; |
1da177e4 | 422 | } |
790fe579 | 423 | if (pSMBr->hdr.Status.CifsError) { |
59b04c5d | 424 | cifs_dbg(FYI, "notify err 0x%x\n", |
f96637be | 425 | pSMBr->hdr.Status.CifsError); |
4b18f2a9 | 426 | return true; |
1da177e4 | 427 | } |
4b18f2a9 | 428 | return false; |
fb8c4b14 | 429 | } |
790fe579 | 430 | if (pSMB->hdr.Command != SMB_COM_LOCKING_ANDX) |
4b18f2a9 | 431 | return false; |
790fe579 | 432 | if (pSMB->hdr.Flags & SMBFLG_RESPONSE) { |
1da177e4 LT |
433 | /* no sense logging error on invalid handle on oplock |
434 | break - harmless race between close request and oplock | |
435 | break response is expected from time to time writing out | |
436 | large dirty files cached on the client */ | |
fb8c4b14 SF |
437 | if ((NT_STATUS_INVALID_HANDLE) == |
438 | le32_to_cpu(pSMB->hdr.Status.CifsError)) { | |
f96637be | 439 | cifs_dbg(FYI, "invalid handle on oplock break\n"); |
4b18f2a9 | 440 | return true; |
fb8c4b14 | 441 | } else if (ERRbadfid == |
1da177e4 | 442 | le16_to_cpu(pSMB->hdr.Status.DosError.Error)) { |
4b18f2a9 | 443 | return true; |
1da177e4 | 444 | } else { |
4b18f2a9 | 445 | return false; /* on valid oplock brk we get "request" */ |
1da177e4 LT |
446 | } |
447 | } | |
790fe579 | 448 | if (pSMB->hdr.WordCount != 8) |
4b18f2a9 | 449 | return false; |
1da177e4 | 450 | |
59b04c5d | 451 | cifs_dbg(FYI, "oplock type 0x%x level 0x%x\n", |
b6b38f70 | 452 | pSMB->LockType, pSMB->OplockLevel); |
790fe579 | 453 | if (!(pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE)) |
4b18f2a9 | 454 | return false; |
1da177e4 LT |
455 | |
456 | /* look up tcon based on tid & uid */ | |
3f9bcca7 | 457 | spin_lock(&cifs_tcp_ses_lock); |
f1987b44 | 458 | list_for_each(tmp, &srv->smb_ses_list) { |
96daf2b0 | 459 | ses = list_entry(tmp, struct cifs_ses, smb_ses_list); |
f1987b44 | 460 | list_for_each(tmp1, &ses->tcon_list) { |
96daf2b0 | 461 | tcon = list_entry(tmp1, struct cifs_tcon, tcon_list); |
f1987b44 JL |
462 | if (tcon->tid != buf->Tid) |
463 | continue; | |
464 | ||
44c58186 | 465 | cifs_stats_inc(&tcon->stats.cifs_stats.num_oplock_brks); |
3afca265 | 466 | spin_lock(&tcon->open_file_lock); |
f1987b44 JL |
467 | list_for_each(tmp2, &tcon->openFileList) { |
468 | netfile = list_entry(tmp2, struct cifsFileInfo, | |
57337e42 | 469 | tlist); |
4b4de76e | 470 | if (pSMB->Fid != netfile->fid.netfid) |
f1987b44 JL |
471 | continue; |
472 | ||
f96637be | 473 | cifs_dbg(FYI, "file id match, oplock break\n"); |
2b0143b5 | 474 | pCifsInode = CIFS_I(d_inode(netfile->dentry)); |
9b646972 | 475 | |
c11f1df5 SP |
476 | set_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, |
477 | &pCifsInode->flags); | |
478 | ||
479 | /* | |
480 | * Set flag if the server downgrades the oplock | |
481 | * to L2 else clear. | |
482 | */ | |
483 | if (pSMB->OplockLevel) | |
484 | set_bit( | |
485 | CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2, | |
486 | &pCifsInode->flags); | |
487 | else | |
488 | clear_bit( | |
489 | CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2, | |
490 | &pCifsInode->flags); | |
491 | ||
3998e6b8 | 492 | queue_work(cifsoplockd_wq, |
ad635942 | 493 | &netfile->oplock_break); |
9b646972 TH |
494 | netfile->oplock_break_cancelled = false; |
495 | ||
3afca265 | 496 | spin_unlock(&tcon->open_file_lock); |
3f9bcca7 | 497 | spin_unlock(&cifs_tcp_ses_lock); |
f1987b44 | 498 | return true; |
1da177e4 | 499 | } |
3afca265 | 500 | spin_unlock(&tcon->open_file_lock); |
3f9bcca7 | 501 | spin_unlock(&cifs_tcp_ses_lock); |
f96637be | 502 | cifs_dbg(FYI, "No matching file for oplock break\n"); |
4b18f2a9 | 503 | return true; |
1da177e4 LT |
504 | } |
505 | } | |
3f9bcca7 | 506 | spin_unlock(&cifs_tcp_ses_lock); |
f96637be | 507 | cifs_dbg(FYI, "Can not process oplock break for non-existent connection\n"); |
4b18f2a9 | 508 | return true; |
1da177e4 LT |
509 | } |
510 | ||
511 | void | |
792af7b0 | 512 | dump_smb(void *buf, int smb_buf_length) |
1da177e4 | 513 | { |
1da177e4 LT |
514 | if (traceSMB == 0) |
515 | return; | |
516 | ||
55d83e0d AS |
517 | print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_NONE, 8, 2, buf, |
518 | smb_buf_length, true); | |
1da177e4 | 519 | } |
6a0b4824 | 520 | |
ec06aedd JL |
521 | void |
522 | cifs_autodisable_serverino(struct cifs_sb_info *cifs_sb) | |
523 | { | |
524 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) { | |
f534dc99 | 525 | cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM; |
f96637be JP |
526 | 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", |
527 | cifs_sb_master_tcon(cifs_sb)->treeName); | |
ec06aedd JL |
528 | } |
529 | } | |
e66673e3 | 530 | |
c6723628 | 531 | void cifs_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock) |
e66673e3 | 532 | { |
c6723628 | 533 | oplock &= 0xF; |
e66673e3 | 534 | |
c6723628 | 535 | if (oplock == OPLOCK_EXCLUSIVE) { |
18cceb6a | 536 | cinode->oplock = CIFS_CACHE_WRITE_FLG | CIFS_CACHE_READ_FLG; |
f96637be JP |
537 | cifs_dbg(FYI, "Exclusive Oplock granted on inode %p\n", |
538 | &cinode->vfs_inode); | |
c6723628 | 539 | } else if (oplock == OPLOCK_READ) { |
18cceb6a | 540 | cinode->oplock = CIFS_CACHE_READ_FLG; |
f96637be JP |
541 | cifs_dbg(FYI, "Level II Oplock granted on inode %p\n", |
542 | &cinode->vfs_inode); | |
18cceb6a PS |
543 | } else |
544 | cinode->oplock = 0; | |
e66673e3 | 545 | } |
3d3ea8e6 | 546 | |
c11f1df5 SP |
547 | /* |
548 | * We wait for oplock breaks to be processed before we attempt to perform | |
549 | * writes. | |
550 | */ | |
551 | int cifs_get_writer(struct cifsInodeInfo *cinode) | |
552 | { | |
553 | int rc; | |
554 | ||
555 | start: | |
556 | rc = wait_on_bit(&cinode->flags, CIFS_INODE_PENDING_OPLOCK_BREAK, | |
74316201 | 557 | TASK_KILLABLE); |
c11f1df5 SP |
558 | if (rc) |
559 | return rc; | |
560 | ||
561 | spin_lock(&cinode->writers_lock); | |
562 | if (!cinode->writers) | |
563 | set_bit(CIFS_INODE_PENDING_WRITERS, &cinode->flags); | |
564 | cinode->writers++; | |
565 | /* Check to see if we have started servicing an oplock break */ | |
566 | if (test_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, &cinode->flags)) { | |
567 | cinode->writers--; | |
568 | if (cinode->writers == 0) { | |
569 | clear_bit(CIFS_INODE_PENDING_WRITERS, &cinode->flags); | |
570 | wake_up_bit(&cinode->flags, CIFS_INODE_PENDING_WRITERS); | |
571 | } | |
572 | spin_unlock(&cinode->writers_lock); | |
573 | goto start; | |
574 | } | |
575 | spin_unlock(&cinode->writers_lock); | |
576 | return 0; | |
577 | } | |
578 | ||
579 | void cifs_put_writer(struct cifsInodeInfo *cinode) | |
580 | { | |
581 | spin_lock(&cinode->writers_lock); | |
582 | cinode->writers--; | |
583 | if (cinode->writers == 0) { | |
584 | clear_bit(CIFS_INODE_PENDING_WRITERS, &cinode->flags); | |
585 | wake_up_bit(&cinode->flags, CIFS_INODE_PENDING_WRITERS); | |
586 | } | |
587 | spin_unlock(&cinode->writers_lock); | |
588 | } | |
589 | ||
590 | void cifs_done_oplock_break(struct cifsInodeInfo *cinode) | |
591 | { | |
592 | clear_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, &cinode->flags); | |
593 | wake_up_bit(&cinode->flags, CIFS_INODE_PENDING_OPLOCK_BREAK); | |
594 | } | |
595 | ||
3d3ea8e6 SP |
596 | bool |
597 | backup_cred(struct cifs_sb_info *cifs_sb) | |
598 | { | |
599 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID) { | |
1f68233c | 600 | if (uid_eq(cifs_sb->mnt_backupuid, current_fsuid())) |
3d3ea8e6 SP |
601 | return true; |
602 | } | |
603 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID) { | |
604 | if (in_group_p(cifs_sb->mnt_backupgid)) | |
605 | return true; | |
606 | } | |
607 | ||
608 | return false; | |
609 | } | |
233839b1 PS |
610 | |
611 | void | |
612 | cifs_del_pending_open(struct cifs_pending_open *open) | |
613 | { | |
3afca265 | 614 | spin_lock(&tlink_tcon(open->tlink)->open_file_lock); |
233839b1 | 615 | list_del(&open->olist); |
3afca265 | 616 | spin_unlock(&tlink_tcon(open->tlink)->open_file_lock); |
233839b1 PS |
617 | } |
618 | ||
619 | void | |
620 | cifs_add_pending_open_locked(struct cifs_fid *fid, struct tcon_link *tlink, | |
621 | struct cifs_pending_open *open) | |
622 | { | |
623 | #ifdef CONFIG_CIFS_SMB2 | |
624 | memcpy(open->lease_key, fid->lease_key, SMB2_LEASE_KEY_SIZE); | |
625 | #endif | |
626 | open->oplock = CIFS_OPLOCK_NO_CHANGE; | |
627 | open->tlink = tlink; | |
628 | fid->pending_open = open; | |
629 | list_add_tail(&open->olist, &tlink_tcon(tlink)->pending_opens); | |
630 | } | |
631 | ||
632 | void | |
633 | cifs_add_pending_open(struct cifs_fid *fid, struct tcon_link *tlink, | |
634 | struct cifs_pending_open *open) | |
635 | { | |
3afca265 | 636 | spin_lock(&tlink_tcon(tlink)->open_file_lock); |
233839b1 | 637 | cifs_add_pending_open_locked(fid, tlink, open); |
3afca265 | 638 | spin_unlock(&tlink_tcon(open->tlink)->open_file_lock); |
233839b1 | 639 | } |
4ecce920 AA |
640 | |
641 | /* parses DFS refferal V3 structure | |
642 | * caller is responsible for freeing target_nodes | |
643 | * returns: | |
644 | * - on success - 0 | |
645 | * - on failure - errno | |
646 | */ | |
647 | int | |
648 | parse_dfs_referrals(struct get_dfs_referral_rsp *rsp, u32 rsp_size, | |
649 | unsigned int *num_of_nodes, | |
650 | struct dfs_info3_param **target_nodes, | |
651 | const struct nls_table *nls_codepage, int remap, | |
652 | const char *searchName, bool is_unicode) | |
653 | { | |
654 | int i, rc = 0; | |
655 | char *data_end; | |
656 | struct dfs_referral_level_3 *ref; | |
657 | ||
658 | *num_of_nodes = le16_to_cpu(rsp->NumberOfReferrals); | |
659 | ||
660 | if (*num_of_nodes < 1) { | |
661 | cifs_dbg(VFS, "num_referrals: must be at least > 0, but we get num_referrals = %d\n", | |
662 | *num_of_nodes); | |
663 | rc = -EINVAL; | |
664 | goto parse_DFS_referrals_exit; | |
665 | } | |
666 | ||
667 | ref = (struct dfs_referral_level_3 *) &(rsp->referrals); | |
668 | if (ref->VersionNumber != cpu_to_le16(3)) { | |
669 | cifs_dbg(VFS, "Referrals of V%d version are not supported, should be V3\n", | |
670 | le16_to_cpu(ref->VersionNumber)); | |
671 | rc = -EINVAL; | |
672 | goto parse_DFS_referrals_exit; | |
673 | } | |
674 | ||
675 | /* get the upper boundary of the resp buffer */ | |
676 | data_end = (char *)rsp + rsp_size; | |
677 | ||
678 | cifs_dbg(FYI, "num_referrals: %d dfs flags: 0x%x ...\n", | |
679 | *num_of_nodes, le32_to_cpu(rsp->DFSFlags)); | |
680 | ||
681 | *target_nodes = kcalloc(*num_of_nodes, sizeof(struct dfs_info3_param), | |
682 | GFP_KERNEL); | |
683 | if (*target_nodes == NULL) { | |
684 | rc = -ENOMEM; | |
685 | goto parse_DFS_referrals_exit; | |
686 | } | |
687 | ||
688 | /* collect necessary data from referrals */ | |
689 | for (i = 0; i < *num_of_nodes; i++) { | |
690 | char *temp; | |
691 | int max_len; | |
692 | struct dfs_info3_param *node = (*target_nodes)+i; | |
693 | ||
694 | node->flags = le32_to_cpu(rsp->DFSFlags); | |
695 | if (is_unicode) { | |
696 | __le16 *tmp = kmalloc(strlen(searchName)*2 + 2, | |
697 | GFP_KERNEL); | |
698 | if (tmp == NULL) { | |
699 | rc = -ENOMEM; | |
700 | goto parse_DFS_referrals_exit; | |
701 | } | |
702 | cifsConvertToUTF16((__le16 *) tmp, searchName, | |
703 | PATH_MAX, nls_codepage, remap); | |
704 | node->path_consumed = cifs_utf16_bytes(tmp, | |
705 | le16_to_cpu(rsp->PathConsumed), | |
706 | nls_codepage); | |
707 | kfree(tmp); | |
708 | } else | |
709 | node->path_consumed = le16_to_cpu(rsp->PathConsumed); | |
710 | ||
711 | node->server_type = le16_to_cpu(ref->ServerType); | |
712 | node->ref_flag = le16_to_cpu(ref->ReferralEntryFlags); | |
713 | ||
714 | /* copy DfsPath */ | |
715 | temp = (char *)ref + le16_to_cpu(ref->DfsPathOffset); | |
716 | max_len = data_end - temp; | |
717 | node->path_name = cifs_strndup_from_utf16(temp, max_len, | |
718 | is_unicode, nls_codepage); | |
719 | if (!node->path_name) { | |
720 | rc = -ENOMEM; | |
721 | goto parse_DFS_referrals_exit; | |
722 | } | |
723 | ||
724 | /* copy link target UNC */ | |
725 | temp = (char *)ref + le16_to_cpu(ref->NetworkAddressOffset); | |
726 | max_len = data_end - temp; | |
727 | node->node_name = cifs_strndup_from_utf16(temp, max_len, | |
728 | is_unicode, nls_codepage); | |
729 | if (!node->node_name) { | |
730 | rc = -ENOMEM; | |
731 | goto parse_DFS_referrals_exit; | |
732 | } | |
733 | ||
734 | ref++; | |
735 | } | |
736 | ||
737 | parse_DFS_referrals_exit: | |
738 | if (rc) { | |
739 | free_dfs_info_array(*target_nodes, *num_of_nodes); | |
740 | *target_nodes = NULL; | |
741 | *num_of_nodes = 0; | |
742 | } | |
743 | return rc; | |
744 | } | |
ccf7f408 PS |
745 | |
746 | struct cifs_aio_ctx * | |
747 | cifs_aio_ctx_alloc(void) | |
748 | { | |
749 | struct cifs_aio_ctx *ctx; | |
750 | ||
751 | ctx = kzalloc(sizeof(struct cifs_aio_ctx), GFP_KERNEL); | |
752 | if (!ctx) | |
753 | return NULL; | |
754 | ||
755 | INIT_LIST_HEAD(&ctx->list); | |
756 | mutex_init(&ctx->aio_mutex); | |
757 | init_completion(&ctx->done); | |
758 | kref_init(&ctx->refcount); | |
759 | return ctx; | |
760 | } | |
761 | ||
762 | void | |
763 | cifs_aio_ctx_release(struct kref *refcount) | |
764 | { | |
765 | struct cifs_aio_ctx *ctx = container_of(refcount, | |
766 | struct cifs_aio_ctx, refcount); | |
767 | ||
768 | cifsFileInfo_put(ctx->cfile); | |
769 | kvfree(ctx->bv); | |
770 | kfree(ctx); | |
771 | } | |
772 | ||
773 | #define CIFS_AIO_KMALLOC_LIMIT (1024 * 1024) | |
774 | ||
775 | int | |
776 | setup_aio_ctx_iter(struct cifs_aio_ctx *ctx, struct iov_iter *iter, int rw) | |
777 | { | |
778 | ssize_t rc; | |
779 | unsigned int cur_npages; | |
780 | unsigned int npages = 0; | |
781 | unsigned int i; | |
782 | size_t len; | |
783 | size_t count = iov_iter_count(iter); | |
784 | unsigned int saved_len; | |
785 | size_t start; | |
786 | unsigned int max_pages = iov_iter_npages(iter, INT_MAX); | |
787 | struct page **pages = NULL; | |
788 | struct bio_vec *bv = NULL; | |
789 | ||
790 | if (iter->type & ITER_KVEC) { | |
791 | memcpy(&ctx->iter, iter, sizeof(struct iov_iter)); | |
792 | ctx->len = count; | |
793 | iov_iter_advance(iter, count); | |
794 | return 0; | |
795 | } | |
796 | ||
797 | if (max_pages * sizeof(struct bio_vec) <= CIFS_AIO_KMALLOC_LIMIT) | |
798 | bv = kmalloc_array(max_pages, sizeof(struct bio_vec), | |
799 | GFP_KERNEL); | |
800 | ||
801 | if (!bv) { | |
802 | bv = vmalloc(max_pages * sizeof(struct bio_vec)); | |
803 | if (!bv) | |
804 | return -ENOMEM; | |
805 | } | |
806 | ||
807 | if (max_pages * sizeof(struct page *) <= CIFS_AIO_KMALLOC_LIMIT) | |
808 | pages = kmalloc_array(max_pages, sizeof(struct page *), | |
809 | GFP_KERNEL); | |
810 | ||
811 | if (!pages) { | |
812 | pages = vmalloc(max_pages * sizeof(struct page *)); | |
813 | if (!bv) { | |
814 | kvfree(bv); | |
815 | return -ENOMEM; | |
816 | } | |
817 | } | |
818 | ||
819 | saved_len = count; | |
820 | ||
821 | while (count && npages < max_pages) { | |
822 | rc = iov_iter_get_pages(iter, pages, count, max_pages, &start); | |
823 | if (rc < 0) { | |
824 | cifs_dbg(VFS, "couldn't get user pages (rc=%zd)\n", rc); | |
825 | break; | |
826 | } | |
827 | ||
828 | if (rc > count) { | |
829 | cifs_dbg(VFS, "get pages rc=%zd more than %zu\n", rc, | |
830 | count); | |
831 | break; | |
832 | } | |
833 | ||
834 | iov_iter_advance(iter, rc); | |
835 | count -= rc; | |
836 | rc += start; | |
837 | cur_npages = DIV_ROUND_UP(rc, PAGE_SIZE); | |
838 | ||
839 | if (npages + cur_npages > max_pages) { | |
840 | cifs_dbg(VFS, "out of vec array capacity (%u vs %u)\n", | |
841 | npages + cur_npages, max_pages); | |
842 | break; | |
843 | } | |
844 | ||
845 | for (i = 0; i < cur_npages; i++) { | |
846 | len = rc > PAGE_SIZE ? PAGE_SIZE : rc; | |
847 | bv[npages + i].bv_page = pages[i]; | |
848 | bv[npages + i].bv_offset = start; | |
849 | bv[npages + i].bv_len = len - start; | |
850 | rc -= len; | |
851 | start = 0; | |
852 | } | |
853 | ||
854 | npages += cur_npages; | |
855 | } | |
856 | ||
857 | kvfree(pages); | |
858 | ctx->bv = bv; | |
859 | ctx->len = saved_len - count; | |
860 | ctx->npages = npages; | |
861 | iov_iter_bvec(&ctx->iter, ITER_BVEC | rw, ctx->bv, npages, ctx->len); | |
862 | return 0; | |
863 | } |