Commit | Line | Data |
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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); |
b6f0dd5d | 85 | spin_lock_init(&ret_buf->iface_lock); |
1da177e4 LT |
86 | } |
87 | return ret_buf; | |
88 | } | |
89 | ||
90 | void | |
96daf2b0 | 91 | sesInfoFree(struct cifs_ses *buf_to_free) |
1da177e4 LT |
92 | { |
93 | if (buf_to_free == NULL) { | |
f96637be | 94 | cifs_dbg(FYI, "Null buffer passed to sesInfoFree\n"); |
1da177e4 LT |
95 | return; |
96 | } | |
97 | ||
1da177e4 | 98 | atomic_dec(&sesInfoAllocCount); |
f99d49ad JJ |
99 | kfree(buf_to_free->serverOS); |
100 | kfree(buf_to_free->serverDomain); | |
101 | kfree(buf_to_free->serverNOS); | |
97f4b727 | 102 | kzfree(buf_to_free->password); |
8727c8a8 | 103 | kfree(buf_to_free->user_name); |
3979877e | 104 | kfree(buf_to_free->domainName); |
97f4b727 | 105 | kzfree(buf_to_free->auth_key.response); |
b6f0dd5d | 106 | kfree(buf_to_free->iface_list); |
97f4b727 | 107 | kzfree(buf_to_free); |
1da177e4 LT |
108 | } |
109 | ||
96daf2b0 | 110 | struct cifs_tcon * |
1da177e4 LT |
111 | tconInfoAlloc(void) |
112 | { | |
96daf2b0 SF |
113 | struct cifs_tcon *ret_buf; |
114 | ret_buf = kzalloc(sizeof(struct cifs_tcon), GFP_KERNEL); | |
1da177e4 | 115 | if (ret_buf) { |
1da177e4 | 116 | atomic_inc(&tconInfoAllocCount); |
1da177e4 | 117 | ret_buf->tidStatus = CifsNew; |
f1987b44 | 118 | ++ret_buf->tc_count; |
1da177e4 | 119 | INIT_LIST_HEAD(&ret_buf->openFileList); |
f1987b44 | 120 | INIT_LIST_HEAD(&ret_buf->tcon_list); |
3afca265 | 121 | spin_lock_init(&ret_buf->open_file_lock); |
a93864d9 RS |
122 | mutex_init(&ret_buf->crfid.fid_mutex); |
123 | ret_buf->crfid.fid = kzalloc(sizeof(struct cifs_fid), | |
124 | GFP_KERNEL); | |
1da177e4 | 125 | spin_lock_init(&ret_buf->stat_lock); |
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); |
97f4b727 | 139 | kzfree(buf_to_free->password); |
a93864d9 | 140 | kfree(buf_to_free->crfid.fid); |
1da177e4 LT |
141 | kfree(buf_to_free); |
142 | } | |
143 | ||
144 | struct smb_hdr * | |
145 | cifs_buf_get(void) | |
146 | { | |
147 | struct smb_hdr *ret_buf = NULL; | |
3792c173 PS |
148 | /* |
149 | * SMB2 header is bigger than CIFS one - no problems to clean some | |
150 | * more bytes for CIFS. | |
151 | */ | |
49f466bd | 152 | size_t buf_size = sizeof(struct smb2_sync_hdr); |
2a38e120 | 153 | |
3792c173 PS |
154 | /* |
155 | * We could use negotiated size instead of max_msgsize - | |
156 | * but it may be more efficient to always alloc same size | |
157 | * albeit slightly larger than necessary and maxbuffersize | |
158 | * defaults to this and can not be bigger. | |
159 | */ | |
232087cb | 160 | ret_buf = mempool_alloc(cifs_req_poolp, GFP_NOFS); |
1da177e4 LT |
161 | |
162 | /* clear the first few header bytes */ | |
163 | /* for most paths, more is cleared in header_assemble */ | |
a6f74e80 N |
164 | memset(ret_buf, 0, buf_size + 3); |
165 | atomic_inc(&bufAllocCount); | |
4498eed5 | 166 | #ifdef CONFIG_CIFS_STATS2 |
a6f74e80 | 167 | atomic_inc(&totBufAllocCount); |
4498eed5 | 168 | #endif /* CONFIG_CIFS_STATS2 */ |
1da177e4 LT |
169 | |
170 | return ret_buf; | |
171 | } | |
172 | ||
173 | void | |
174 | cifs_buf_release(void *buf_to_free) | |
175 | { | |
1da177e4 | 176 | if (buf_to_free == NULL) { |
f96637be | 177 | /* cifs_dbg(FYI, "Null buffer passed to cifs_buf_release\n");*/ |
1da177e4 LT |
178 | return; |
179 | } | |
fb8c4b14 | 180 | mempool_free(buf_to_free, cifs_req_poolp); |
1da177e4 LT |
181 | |
182 | atomic_dec(&bufAllocCount); | |
183 | return; | |
184 | } | |
185 | ||
186 | struct smb_hdr * | |
187 | cifs_small_buf_get(void) | |
188 | { | |
189 | struct smb_hdr *ret_buf = NULL; | |
190 | ||
fb8c4b14 SF |
191 | /* We could use negotiated size instead of max_msgsize - |
192 | but it may be more efficient to always alloc same size | |
193 | albeit slightly larger than necessary and maxbuffersize | |
1da177e4 | 194 | defaults to this and can not be bigger */ |
232087cb | 195 | ret_buf = mempool_alloc(cifs_sm_req_poolp, GFP_NOFS); |
1da177e4 LT |
196 | /* No need to clear memory here, cleared in header assemble */ |
197 | /* memset(ret_buf, 0, sizeof(struct smb_hdr) + 27);*/ | |
a6f74e80 | 198 | atomic_inc(&smBufAllocCount); |
4498eed5 | 199 | #ifdef CONFIG_CIFS_STATS2 |
a6f74e80 | 200 | atomic_inc(&totSmBufAllocCount); |
4498eed5 SF |
201 | #endif /* CONFIG_CIFS_STATS2 */ |
202 | ||
1da177e4 LT |
203 | return ret_buf; |
204 | } | |
205 | ||
206 | void | |
207 | cifs_small_buf_release(void *buf_to_free) | |
208 | { | |
209 | ||
210 | if (buf_to_free == NULL) { | |
f96637be | 211 | cifs_dbg(FYI, "Null buffer passed to cifs_small_buf_release\n"); |
1da177e4 LT |
212 | return; |
213 | } | |
fb8c4b14 | 214 | mempool_free(buf_to_free, cifs_sm_req_poolp); |
1da177e4 LT |
215 | |
216 | atomic_dec(&smBufAllocCount); | |
217 | return; | |
218 | } | |
219 | ||
6d81ed1e SP |
220 | void |
221 | free_rsp_buf(int resp_buftype, void *rsp) | |
222 | { | |
223 | if (resp_buftype == CIFS_SMALL_BUFFER) | |
224 | cifs_small_buf_release(rsp); | |
225 | else if (resp_buftype == CIFS_LARGE_BUFFER) | |
226 | cifs_buf_release(rsp); | |
227 | } | |
228 | ||
1982c344 SF |
229 | /* NB: MID can not be set if treeCon not passed in, in that |
230 | case it is responsbility of caller to set the mid */ | |
1da177e4 LT |
231 | void |
232 | header_assemble(struct smb_hdr *buffer, char smb_command /* command */ , | |
96daf2b0 | 233 | const struct cifs_tcon *treeCon, int word_count |
1da177e4 LT |
234 | /* length of fixed section (word count) in two byte units */) |
235 | { | |
1da177e4 LT |
236 | char *temp = (char *) buffer; |
237 | ||
fb8c4b14 | 238 | memset(temp, 0, 256); /* bigger than MAX_CIFS_HDR_SIZE */ |
1da177e4 | 239 | |
be8e3b00 | 240 | buffer->smb_buf_length = cpu_to_be32( |
630f3f0c | 241 | (2 * word_count) + sizeof(struct smb_hdr) - |
1da177e4 | 242 | 4 /* RFC 1001 length field does not count */ + |
be8e3b00 | 243 | 2 /* for bcc field itself */) ; |
1da177e4 LT |
244 | |
245 | buffer->Protocol[0] = 0xFF; | |
246 | buffer->Protocol[1] = 'S'; | |
247 | buffer->Protocol[2] = 'M'; | |
248 | buffer->Protocol[3] = 'B'; | |
249 | buffer->Command = smb_command; | |
250 | buffer->Flags = 0x00; /* case sensitive */ | |
251 | buffer->Flags2 = SMBFLG2_KNOWS_LONG_NAMES; | |
252 | buffer->Pid = cpu_to_le16((__u16)current->tgid); | |
253 | buffer->PidHigh = cpu_to_le16((__u16)(current->tgid >> 16)); | |
1da177e4 LT |
254 | if (treeCon) { |
255 | buffer->Tid = treeCon->tid; | |
256 | if (treeCon->ses) { | |
257 | if (treeCon->ses->capabilities & CAP_UNICODE) | |
258 | buffer->Flags2 |= SMBFLG2_UNICODE; | |
ad7a2926 | 259 | if (treeCon->ses->capabilities & CAP_STATUS32) |
1da177e4 | 260 | buffer->Flags2 |= SMBFLG2_ERR_STATUS; |
ad7a2926 | 261 | |
1982c344 SF |
262 | /* Uid is not converted */ |
263 | buffer->Uid = treeCon->ses->Suid; | |
88257360 | 264 | buffer->Mid = get_next_mid(treeCon->ses->server); |
1da177e4 LT |
265 | } |
266 | if (treeCon->Flags & SMB_SHARE_IS_IN_DFS) | |
267 | buffer->Flags2 |= SMBFLG2_DFS; | |
d3485d37 SF |
268 | if (treeCon->nocase) |
269 | buffer->Flags |= SMBFLG_CASELESS; | |
790fe579 | 270 | if ((treeCon->ses) && (treeCon->ses->server)) |
38d77c50 | 271 | if (treeCon->ses->server->sign) |
1da177e4 LT |
272 | buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE; |
273 | } | |
274 | ||
275 | /* endian conversion of flags is now done just before sending */ | |
276 | buffer->WordCount = (char) word_count; | |
277 | return; | |
278 | } | |
279 | ||
2cd646a2 | 280 | static int |
944d6f1a | 281 | check_smb_hdr(struct smb_hdr *smb) |
1da177e4 | 282 | { |
68abaffa JL |
283 | /* does it have the right SMB "signature" ? */ |
284 | if (*(__le32 *) smb->Protocol != cpu_to_le32(0x424d53ff)) { | |
f96637be JP |
285 | cifs_dbg(VFS, "Bad protocol string signature header 0x%x\n", |
286 | *(unsigned int *)smb->Protocol); | |
68abaffa JL |
287 | return 1; |
288 | } | |
289 | ||
68abaffa JL |
290 | /* if it's a response then accept */ |
291 | if (smb->Flags & SMBFLG_RESPONSE) | |
292 | return 0; | |
293 | ||
294 | /* only one valid case where server sends us request */ | |
295 | if (smb->Command == SMB_COM_LOCKING_ANDX) | |
296 | return 0; | |
297 | ||
3d378d3f TG |
298 | cifs_dbg(VFS, "Server sent request, not response. mid=%u\n", |
299 | get_mid(smb)); | |
1da177e4 LT |
300 | return 1; |
301 | } | |
302 | ||
303 | int | |
373512ec | 304 | checkSMB(char *buf, unsigned int total_read, struct TCP_Server_Info *server) |
1da177e4 | 305 | { |
d4e4854f | 306 | struct smb_hdr *smb = (struct smb_hdr *)buf; |
376b43f4 | 307 | __u32 rfclen = be32_to_cpu(smb->smb_buf_length); |
190fdeb8 | 308 | __u32 clc_len; /* calculated length */ |
f96637be JP |
309 | cifs_dbg(FYI, "checkSMB Length: 0x%x, smb_buf_length: 0x%x\n", |
310 | total_read, rfclen); | |
d103e164 | 311 | |
376b43f4 JL |
312 | /* is this frame too small to even get to a BCC? */ |
313 | if (total_read < 2 + sizeof(struct smb_hdr)) { | |
314 | if ((total_read >= sizeof(struct smb_hdr) - 1) | |
1da177e4 | 315 | && (smb->Status.CifsError != 0)) { |
376b43f4 | 316 | /* it's an error return */ |
d103e164 SF |
317 | smb->WordCount = 0; |
318 | /* some error cases do not return wct and bcc */ | |
319 | return 0; | |
376b43f4 | 320 | } else if ((total_read == sizeof(struct smb_hdr) + 1) && |
d103e164 | 321 | (smb->WordCount == 0)) { |
fb8c4b14 | 322 | char *tmp = (char *)smb; |
d103e164 SF |
323 | /* Need to work around a bug in two servers here */ |
324 | /* First, check if the part of bcc they sent was zero */ | |
325 | if (tmp[sizeof(struct smb_hdr)] == 0) { | |
326 | /* some servers return only half of bcc | |
327 | * on simple responses (wct, bcc both zero) | |
328 | * in particular have seen this on | |
329 | * ulogoffX and FindClose. This leaves | |
330 | * one byte of bcc potentially unitialized | |
331 | */ | |
332 | /* zero rest of bcc */ | |
333 | tmp[sizeof(struct smb_hdr)+1] = 0; | |
46c79a64 | 334 | return 0; |
1da177e4 | 335 | } |
f96637be | 336 | cifs_dbg(VFS, "rcvd invalid byte count (bcc)\n"); |
d103e164 | 337 | } else { |
f96637be | 338 | cifs_dbg(VFS, "Length less than smb header size\n"); |
1da177e4 | 339 | } |
376b43f4 | 340 | return -EIO; |
1da177e4 LT |
341 | } |
342 | ||
376b43f4 | 343 | /* otherwise, there is enough to get to the BCC */ |
944d6f1a | 344 | if (check_smb_hdr(smb)) |
376b43f4 | 345 | return -EIO; |
9ec672bd | 346 | clc_len = smbCalcSize(smb, server); |
184ed211 | 347 | |
376b43f4 | 348 | if (4 + rfclen != total_read) { |
f96637be JP |
349 | cifs_dbg(VFS, "Length read does not match RFC1001 length %d\n", |
350 | rfclen); | |
376b43f4 | 351 | return -EIO; |
184ed211 SF |
352 | } |
353 | ||
376b43f4 | 354 | if (4 + rfclen != clc_len) { |
3d378d3f | 355 | __u16 mid = get_mid(smb); |
184ed211 | 356 | /* check if bcc wrapped around for large read responses */ |
376b43f4 | 357 | if ((rfclen > 64 * 1024) && (rfclen > clc_len)) { |
184ed211 | 358 | /* check if lengths match mod 64K */ |
376b43f4 | 359 | if (((4 + rfclen) & 0xFFFF) == (clc_len & 0xFFFF)) |
fb8c4b14 | 360 | return 0; /* bcc wrapped */ |
184ed211 | 361 | } |
f96637be | 362 | cifs_dbg(FYI, "Calculated size %u vs length %u mismatch for mid=%u\n", |
3d378d3f | 363 | clc_len, 4 + rfclen, mid); |
6284644e | 364 | |
376b43f4 | 365 | if (4 + rfclen < clc_len) { |
f96637be | 366 | cifs_dbg(VFS, "RFC1001 size %u smaller than SMB for mid=%u\n", |
3d378d3f | 367 | rfclen, mid); |
376b43f4 JL |
368 | return -EIO; |
369 | } else if (rfclen > clc_len + 512) { | |
6284644e JL |
370 | /* |
371 | * Some servers (Windows XP in particular) send more | |
372 | * data than the lengths in the SMB packet would | |
373 | * indicate on certain calls (byte range locks and | |
374 | * trans2 find first calls in particular). While the | |
375 | * client can handle such a frame by ignoring the | |
376 | * trailing data, we choose limit the amount of extra | |
377 | * data to 512 bytes. | |
378 | */ | |
f96637be | 379 | cifs_dbg(VFS, "RFC1001 size %u more than 512 bytes larger than SMB for mid=%u\n", |
3d378d3f | 380 | rfclen, mid); |
376b43f4 | 381 | return -EIO; |
46c79a64 | 382 | } |
1da177e4 | 383 | } |
20962438 | 384 | return 0; |
1da177e4 | 385 | } |
4b18f2a9 SF |
386 | |
387 | bool | |
d4e4854f | 388 | is_valid_oplock_break(char *buffer, struct TCP_Server_Info *srv) |
fb8c4b14 | 389 | { |
d4e4854f | 390 | struct smb_hdr *buf = (struct smb_hdr *)buffer; |
fb8c4b14 | 391 | struct smb_com_lock_req *pSMB = (struct smb_com_lock_req *)buf; |
f1987b44 | 392 | struct list_head *tmp, *tmp1, *tmp2; |
96daf2b0 SF |
393 | struct cifs_ses *ses; |
394 | struct cifs_tcon *tcon; | |
f1987b44 | 395 | struct cifsInodeInfo *pCifsInode; |
1da177e4 LT |
396 | struct cifsFileInfo *netfile; |
397 | ||
f96637be | 398 | cifs_dbg(FYI, "Checking for oplock break or dnotify response\n"); |
790fe579 | 399 | if ((pSMB->hdr.Command == SMB_COM_NT_TRANSACT) && |
1da177e4 | 400 | (pSMB->hdr.Flags & SMBFLG_RESPONSE)) { |
fb8c4b14 | 401 | struct smb_com_transaction_change_notify_rsp *pSMBr = |
1da177e4 | 402 | (struct smb_com_transaction_change_notify_rsp *)buf; |
fb8c4b14 | 403 | struct file_notify_information *pnotify; |
1da177e4 | 404 | __u32 data_offset = 0; |
097f5863 DC |
405 | size_t len = srv->total_read - sizeof(pSMBr->hdr.smb_buf_length); |
406 | ||
820a803f | 407 | if (get_bcc(buf) > sizeof(struct file_notify_information)) { |
1da177e4 LT |
408 | data_offset = le32_to_cpu(pSMBr->DataOffset); |
409 | ||
097f5863 DC |
410 | if (data_offset > |
411 | len - sizeof(struct file_notify_information)) { | |
412 | cifs_dbg(FYI, "invalid data_offset %u\n", | |
413 | data_offset); | |
414 | return true; | |
415 | } | |
3979877e SF |
416 | pnotify = (struct file_notify_information *) |
417 | ((char *)&pSMBr->hdr.Protocol + data_offset); | |
f96637be | 418 | cifs_dbg(FYI, "dnotify on %s Action: 0x%x\n", |
b6b38f70 | 419 | pnotify->FileName, pnotify->Action); |
fb8c4b14 | 420 | /* cifs_dump_mem("Rcvd notify Data: ",buf, |
3979877e | 421 | sizeof(struct smb_hdr)+60); */ |
4b18f2a9 | 422 | return true; |
1da177e4 | 423 | } |
790fe579 | 424 | if (pSMBr->hdr.Status.CifsError) { |
59b04c5d | 425 | cifs_dbg(FYI, "notify err 0x%x\n", |
f96637be | 426 | pSMBr->hdr.Status.CifsError); |
4b18f2a9 | 427 | return true; |
1da177e4 | 428 | } |
4b18f2a9 | 429 | return false; |
fb8c4b14 | 430 | } |
790fe579 | 431 | if (pSMB->hdr.Command != SMB_COM_LOCKING_ANDX) |
4b18f2a9 | 432 | return false; |
790fe579 | 433 | if (pSMB->hdr.Flags & SMBFLG_RESPONSE) { |
1da177e4 LT |
434 | /* no sense logging error on invalid handle on oplock |
435 | break - harmless race between close request and oplock | |
436 | break response is expected from time to time writing out | |
437 | large dirty files cached on the client */ | |
fb8c4b14 SF |
438 | if ((NT_STATUS_INVALID_HANDLE) == |
439 | le32_to_cpu(pSMB->hdr.Status.CifsError)) { | |
f96637be | 440 | cifs_dbg(FYI, "invalid handle on oplock break\n"); |
4b18f2a9 | 441 | return true; |
fb8c4b14 | 442 | } else if (ERRbadfid == |
1da177e4 | 443 | le16_to_cpu(pSMB->hdr.Status.DosError.Error)) { |
4b18f2a9 | 444 | return true; |
1da177e4 | 445 | } else { |
4b18f2a9 | 446 | return false; /* on valid oplock brk we get "request" */ |
1da177e4 LT |
447 | } |
448 | } | |
790fe579 | 449 | if (pSMB->hdr.WordCount != 8) |
4b18f2a9 | 450 | return false; |
1da177e4 | 451 | |
59b04c5d | 452 | cifs_dbg(FYI, "oplock type 0x%x level 0x%x\n", |
b6b38f70 | 453 | pSMB->LockType, pSMB->OplockLevel); |
790fe579 | 454 | if (!(pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE)) |
4b18f2a9 | 455 | return false; |
1da177e4 LT |
456 | |
457 | /* look up tcon based on tid & uid */ | |
3f9bcca7 | 458 | spin_lock(&cifs_tcp_ses_lock); |
f1987b44 | 459 | list_for_each(tmp, &srv->smb_ses_list) { |
96daf2b0 | 460 | ses = list_entry(tmp, struct cifs_ses, smb_ses_list); |
f1987b44 | 461 | list_for_each(tmp1, &ses->tcon_list) { |
96daf2b0 | 462 | tcon = list_entry(tmp1, struct cifs_tcon, tcon_list); |
f1987b44 JL |
463 | if (tcon->tid != buf->Tid) |
464 | continue; | |
465 | ||
44c58186 | 466 | cifs_stats_inc(&tcon->stats.cifs_stats.num_oplock_brks); |
3afca265 | 467 | spin_lock(&tcon->open_file_lock); |
f1987b44 JL |
468 | list_for_each(tmp2, &tcon->openFileList) { |
469 | netfile = list_entry(tmp2, struct cifsFileInfo, | |
57337e42 | 470 | tlist); |
4b4de76e | 471 | if (pSMB->Fid != netfile->fid.netfid) |
f1987b44 JL |
472 | continue; |
473 | ||
f96637be | 474 | cifs_dbg(FYI, "file id match, oplock break\n"); |
2b0143b5 | 475 | pCifsInode = CIFS_I(d_inode(netfile->dentry)); |
9b646972 | 476 | |
c11f1df5 SP |
477 | set_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, |
478 | &pCifsInode->flags); | |
479 | ||
480 | /* | |
481 | * Set flag if the server downgrades the oplock | |
482 | * to L2 else clear. | |
483 | */ | |
484 | if (pSMB->OplockLevel) | |
485 | set_bit( | |
486 | CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2, | |
487 | &pCifsInode->flags); | |
488 | else | |
489 | clear_bit( | |
490 | CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2, | |
491 | &pCifsInode->flags); | |
492 | ||
3998e6b8 | 493 | queue_work(cifsoplockd_wq, |
ad635942 | 494 | &netfile->oplock_break); |
9b646972 TH |
495 | netfile->oplock_break_cancelled = false; |
496 | ||
3afca265 | 497 | spin_unlock(&tcon->open_file_lock); |
3f9bcca7 | 498 | spin_unlock(&cifs_tcp_ses_lock); |
f1987b44 | 499 | return true; |
1da177e4 | 500 | } |
3afca265 | 501 | spin_unlock(&tcon->open_file_lock); |
3f9bcca7 | 502 | spin_unlock(&cifs_tcp_ses_lock); |
f96637be | 503 | cifs_dbg(FYI, "No matching file for oplock break\n"); |
4b18f2a9 | 504 | return true; |
1da177e4 LT |
505 | } |
506 | } | |
3f9bcca7 | 507 | spin_unlock(&cifs_tcp_ses_lock); |
f96637be | 508 | cifs_dbg(FYI, "Can not process oplock break for non-existent connection\n"); |
4b18f2a9 | 509 | return true; |
1da177e4 LT |
510 | } |
511 | ||
512 | void | |
792af7b0 | 513 | dump_smb(void *buf, int smb_buf_length) |
1da177e4 | 514 | { |
1da177e4 LT |
515 | if (traceSMB == 0) |
516 | return; | |
517 | ||
55d83e0d AS |
518 | print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_NONE, 8, 2, buf, |
519 | smb_buf_length, true); | |
1da177e4 | 520 | } |
6a0b4824 | 521 | |
ec06aedd JL |
522 | void |
523 | cifs_autodisable_serverino(struct cifs_sb_info *cifs_sb) | |
524 | { | |
525 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) { | |
f534dc99 | 526 | cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM; |
f96637be JP |
527 | 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", |
528 | cifs_sb_master_tcon(cifs_sb)->treeName); | |
ec06aedd JL |
529 | } |
530 | } | |
e66673e3 | 531 | |
c6723628 | 532 | void cifs_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock) |
e66673e3 | 533 | { |
c6723628 | 534 | oplock &= 0xF; |
e66673e3 | 535 | |
c6723628 | 536 | if (oplock == OPLOCK_EXCLUSIVE) { |
18cceb6a | 537 | cinode->oplock = CIFS_CACHE_WRITE_FLG | CIFS_CACHE_READ_FLG; |
f96637be JP |
538 | cifs_dbg(FYI, "Exclusive Oplock granted on inode %p\n", |
539 | &cinode->vfs_inode); | |
c6723628 | 540 | } else if (oplock == OPLOCK_READ) { |
18cceb6a | 541 | cinode->oplock = CIFS_CACHE_READ_FLG; |
f96637be JP |
542 | cifs_dbg(FYI, "Level II Oplock granted on inode %p\n", |
543 | &cinode->vfs_inode); | |
18cceb6a PS |
544 | } else |
545 | cinode->oplock = 0; | |
e66673e3 | 546 | } |
3d3ea8e6 | 547 | |
c11f1df5 SP |
548 | /* |
549 | * We wait for oplock breaks to be processed before we attempt to perform | |
550 | * writes. | |
551 | */ | |
552 | int cifs_get_writer(struct cifsInodeInfo *cinode) | |
553 | { | |
554 | int rc; | |
555 | ||
556 | start: | |
557 | rc = wait_on_bit(&cinode->flags, CIFS_INODE_PENDING_OPLOCK_BREAK, | |
74316201 | 558 | TASK_KILLABLE); |
c11f1df5 SP |
559 | if (rc) |
560 | return rc; | |
561 | ||
562 | spin_lock(&cinode->writers_lock); | |
563 | if (!cinode->writers) | |
564 | set_bit(CIFS_INODE_PENDING_WRITERS, &cinode->flags); | |
565 | cinode->writers++; | |
566 | /* Check to see if we have started servicing an oplock break */ | |
567 | if (test_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, &cinode->flags)) { | |
568 | cinode->writers--; | |
569 | if (cinode->writers == 0) { | |
570 | clear_bit(CIFS_INODE_PENDING_WRITERS, &cinode->flags); | |
571 | wake_up_bit(&cinode->flags, CIFS_INODE_PENDING_WRITERS); | |
572 | } | |
573 | spin_unlock(&cinode->writers_lock); | |
574 | goto start; | |
575 | } | |
576 | spin_unlock(&cinode->writers_lock); | |
577 | return 0; | |
578 | } | |
579 | ||
580 | void cifs_put_writer(struct cifsInodeInfo *cinode) | |
581 | { | |
582 | spin_lock(&cinode->writers_lock); | |
583 | cinode->writers--; | |
584 | if (cinode->writers == 0) { | |
585 | clear_bit(CIFS_INODE_PENDING_WRITERS, &cinode->flags); | |
586 | wake_up_bit(&cinode->flags, CIFS_INODE_PENDING_WRITERS); | |
587 | } | |
588 | spin_unlock(&cinode->writers_lock); | |
589 | } | |
590 | ||
591 | void cifs_done_oplock_break(struct cifsInodeInfo *cinode) | |
592 | { | |
593 | clear_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, &cinode->flags); | |
594 | wake_up_bit(&cinode->flags, CIFS_INODE_PENDING_OPLOCK_BREAK); | |
595 | } | |
596 | ||
3d3ea8e6 SP |
597 | bool |
598 | backup_cred(struct cifs_sb_info *cifs_sb) | |
599 | { | |
600 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID) { | |
1f68233c | 601 | if (uid_eq(cifs_sb->mnt_backupuid, current_fsuid())) |
3d3ea8e6 SP |
602 | return true; |
603 | } | |
604 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID) { | |
605 | if (in_group_p(cifs_sb->mnt_backupgid)) | |
606 | return true; | |
607 | } | |
608 | ||
609 | return false; | |
610 | } | |
233839b1 PS |
611 | |
612 | void | |
613 | cifs_del_pending_open(struct cifs_pending_open *open) | |
614 | { | |
3afca265 | 615 | spin_lock(&tlink_tcon(open->tlink)->open_file_lock); |
233839b1 | 616 | list_del(&open->olist); |
3afca265 | 617 | spin_unlock(&tlink_tcon(open->tlink)->open_file_lock); |
233839b1 PS |
618 | } |
619 | ||
620 | void | |
621 | cifs_add_pending_open_locked(struct cifs_fid *fid, struct tcon_link *tlink, | |
622 | struct cifs_pending_open *open) | |
623 | { | |
233839b1 | 624 | memcpy(open->lease_key, fid->lease_key, SMB2_LEASE_KEY_SIZE); |
233839b1 PS |
625 | open->oplock = CIFS_OPLOCK_NO_CHANGE; |
626 | open->tlink = tlink; | |
627 | fid->pending_open = open; | |
628 | list_add_tail(&open->olist, &tlink_tcon(tlink)->pending_opens); | |
629 | } | |
630 | ||
631 | void | |
632 | cifs_add_pending_open(struct cifs_fid *fid, struct tcon_link *tlink, | |
633 | struct cifs_pending_open *open) | |
634 | { | |
3afca265 | 635 | spin_lock(&tlink_tcon(tlink)->open_file_lock); |
233839b1 | 636 | cifs_add_pending_open_locked(fid, tlink, open); |
3afca265 | 637 | spin_unlock(&tlink_tcon(open->tlink)->open_file_lock); |
233839b1 | 638 | } |
4ecce920 AA |
639 | |
640 | /* parses DFS refferal V3 structure | |
641 | * caller is responsible for freeing target_nodes | |
642 | * returns: | |
643 | * - on success - 0 | |
644 | * - on failure - errno | |
645 | */ | |
646 | int | |
647 | parse_dfs_referrals(struct get_dfs_referral_rsp *rsp, u32 rsp_size, | |
648 | unsigned int *num_of_nodes, | |
649 | struct dfs_info3_param **target_nodes, | |
650 | const struct nls_table *nls_codepage, int remap, | |
651 | const char *searchName, bool is_unicode) | |
652 | { | |
653 | int i, rc = 0; | |
654 | char *data_end; | |
655 | struct dfs_referral_level_3 *ref; | |
656 | ||
657 | *num_of_nodes = le16_to_cpu(rsp->NumberOfReferrals); | |
658 | ||
659 | if (*num_of_nodes < 1) { | |
660 | cifs_dbg(VFS, "num_referrals: must be at least > 0, but we get num_referrals = %d\n", | |
661 | *num_of_nodes); | |
662 | rc = -EINVAL; | |
663 | goto parse_DFS_referrals_exit; | |
664 | } | |
665 | ||
666 | ref = (struct dfs_referral_level_3 *) &(rsp->referrals); | |
667 | if (ref->VersionNumber != cpu_to_le16(3)) { | |
668 | cifs_dbg(VFS, "Referrals of V%d version are not supported, should be V3\n", | |
669 | le16_to_cpu(ref->VersionNumber)); | |
670 | rc = -EINVAL; | |
671 | goto parse_DFS_referrals_exit; | |
672 | } | |
673 | ||
674 | /* get the upper boundary of the resp buffer */ | |
675 | data_end = (char *)rsp + rsp_size; | |
676 | ||
677 | cifs_dbg(FYI, "num_referrals: %d dfs flags: 0x%x ...\n", | |
678 | *num_of_nodes, le32_to_cpu(rsp->DFSFlags)); | |
679 | ||
680 | *target_nodes = kcalloc(*num_of_nodes, sizeof(struct dfs_info3_param), | |
681 | GFP_KERNEL); | |
682 | if (*target_nodes == NULL) { | |
683 | rc = -ENOMEM; | |
684 | goto parse_DFS_referrals_exit; | |
685 | } | |
686 | ||
687 | /* collect necessary data from referrals */ | |
688 | for (i = 0; i < *num_of_nodes; i++) { | |
689 | char *temp; | |
690 | int max_len; | |
691 | struct dfs_info3_param *node = (*target_nodes)+i; | |
692 | ||
693 | node->flags = le32_to_cpu(rsp->DFSFlags); | |
694 | if (is_unicode) { | |
695 | __le16 *tmp = kmalloc(strlen(searchName)*2 + 2, | |
696 | GFP_KERNEL); | |
697 | if (tmp == NULL) { | |
698 | rc = -ENOMEM; | |
699 | goto parse_DFS_referrals_exit; | |
700 | } | |
701 | cifsConvertToUTF16((__le16 *) tmp, searchName, | |
702 | PATH_MAX, nls_codepage, remap); | |
703 | node->path_consumed = cifs_utf16_bytes(tmp, | |
704 | le16_to_cpu(rsp->PathConsumed), | |
705 | nls_codepage); | |
706 | kfree(tmp); | |
707 | } else | |
708 | node->path_consumed = le16_to_cpu(rsp->PathConsumed); | |
709 | ||
710 | node->server_type = le16_to_cpu(ref->ServerType); | |
711 | node->ref_flag = le16_to_cpu(ref->ReferralEntryFlags); | |
712 | ||
713 | /* copy DfsPath */ | |
714 | temp = (char *)ref + le16_to_cpu(ref->DfsPathOffset); | |
715 | max_len = data_end - temp; | |
716 | node->path_name = cifs_strndup_from_utf16(temp, max_len, | |
717 | is_unicode, nls_codepage); | |
718 | if (!node->path_name) { | |
719 | rc = -ENOMEM; | |
720 | goto parse_DFS_referrals_exit; | |
721 | } | |
722 | ||
723 | /* copy link target UNC */ | |
724 | temp = (char *)ref + le16_to_cpu(ref->NetworkAddressOffset); | |
725 | max_len = data_end - temp; | |
726 | node->node_name = cifs_strndup_from_utf16(temp, max_len, | |
727 | is_unicode, nls_codepage); | |
728 | if (!node->node_name) { | |
729 | rc = -ENOMEM; | |
730 | goto parse_DFS_referrals_exit; | |
731 | } | |
732 | ||
733 | ref++; | |
734 | } | |
735 | ||
736 | parse_DFS_referrals_exit: | |
737 | if (rc) { | |
738 | free_dfs_info_array(*target_nodes, *num_of_nodes); | |
739 | *target_nodes = NULL; | |
740 | *num_of_nodes = 0; | |
741 | } | |
742 | return rc; | |
743 | } | |
ccf7f408 PS |
744 | |
745 | struct cifs_aio_ctx * | |
746 | cifs_aio_ctx_alloc(void) | |
747 | { | |
748 | struct cifs_aio_ctx *ctx; | |
749 | ||
750 | ctx = kzalloc(sizeof(struct cifs_aio_ctx), GFP_KERNEL); | |
751 | if (!ctx) | |
752 | return NULL; | |
753 | ||
754 | INIT_LIST_HEAD(&ctx->list); | |
755 | mutex_init(&ctx->aio_mutex); | |
756 | init_completion(&ctx->done); | |
757 | kref_init(&ctx->refcount); | |
758 | return ctx; | |
759 | } | |
760 | ||
761 | void | |
762 | cifs_aio_ctx_release(struct kref *refcount) | |
763 | { | |
764 | struct cifs_aio_ctx *ctx = container_of(refcount, | |
765 | struct cifs_aio_ctx, refcount); | |
766 | ||
767 | cifsFileInfo_put(ctx->cfile); | |
768 | kvfree(ctx->bv); | |
769 | kfree(ctx); | |
770 | } | |
771 | ||
772 | #define CIFS_AIO_KMALLOC_LIMIT (1024 * 1024) | |
773 | ||
774 | int | |
775 | setup_aio_ctx_iter(struct cifs_aio_ctx *ctx, struct iov_iter *iter, int rw) | |
776 | { | |
777 | ssize_t rc; | |
778 | unsigned int cur_npages; | |
779 | unsigned int npages = 0; | |
780 | unsigned int i; | |
781 | size_t len; | |
782 | size_t count = iov_iter_count(iter); | |
783 | unsigned int saved_len; | |
784 | size_t start; | |
785 | unsigned int max_pages = iov_iter_npages(iter, INT_MAX); | |
786 | struct page **pages = NULL; | |
787 | struct bio_vec *bv = NULL; | |
788 | ||
789 | if (iter->type & ITER_KVEC) { | |
790 | memcpy(&ctx->iter, iter, sizeof(struct iov_iter)); | |
791 | ctx->len = count; | |
792 | iov_iter_advance(iter, count); | |
793 | return 0; | |
794 | } | |
795 | ||
796 | if (max_pages * sizeof(struct bio_vec) <= CIFS_AIO_KMALLOC_LIMIT) | |
797 | bv = kmalloc_array(max_pages, sizeof(struct bio_vec), | |
798 | GFP_KERNEL); | |
799 | ||
800 | if (!bv) { | |
42bc47b3 | 801 | bv = vmalloc(array_size(max_pages, sizeof(struct bio_vec))); |
ccf7f408 PS |
802 | if (!bv) |
803 | return -ENOMEM; | |
804 | } | |
805 | ||
806 | if (max_pages * sizeof(struct page *) <= CIFS_AIO_KMALLOC_LIMIT) | |
807 | pages = kmalloc_array(max_pages, sizeof(struct page *), | |
808 | GFP_KERNEL); | |
809 | ||
810 | if (!pages) { | |
42bc47b3 | 811 | pages = vmalloc(array_size(max_pages, sizeof(struct page *))); |
ecf3411a | 812 | if (!pages) { |
ccf7f408 PS |
813 | kvfree(bv); |
814 | return -ENOMEM; | |
815 | } | |
816 | } | |
817 | ||
818 | saved_len = count; | |
819 | ||
820 | while (count && npages < max_pages) { | |
821 | rc = iov_iter_get_pages(iter, pages, count, max_pages, &start); | |
822 | if (rc < 0) { | |
823 | cifs_dbg(VFS, "couldn't get user pages (rc=%zd)\n", rc); | |
824 | break; | |
825 | } | |
826 | ||
827 | if (rc > count) { | |
828 | cifs_dbg(VFS, "get pages rc=%zd more than %zu\n", rc, | |
829 | count); | |
830 | break; | |
831 | } | |
832 | ||
833 | iov_iter_advance(iter, rc); | |
834 | count -= rc; | |
835 | rc += start; | |
836 | cur_npages = DIV_ROUND_UP(rc, PAGE_SIZE); | |
837 | ||
838 | if (npages + cur_npages > max_pages) { | |
839 | cifs_dbg(VFS, "out of vec array capacity (%u vs %u)\n", | |
840 | npages + cur_npages, max_pages); | |
841 | break; | |
842 | } | |
843 | ||
844 | for (i = 0; i < cur_npages; i++) { | |
845 | len = rc > PAGE_SIZE ? PAGE_SIZE : rc; | |
846 | bv[npages + i].bv_page = pages[i]; | |
847 | bv[npages + i].bv_offset = start; | |
848 | bv[npages + i].bv_len = len - start; | |
849 | rc -= len; | |
850 | start = 0; | |
851 | } | |
852 | ||
853 | npages += cur_npages; | |
854 | } | |
855 | ||
856 | kvfree(pages); | |
857 | ctx->bv = bv; | |
858 | ctx->len = saved_len - count; | |
859 | ctx->npages = npages; | |
860 | iov_iter_bvec(&ctx->iter, ITER_BVEC | rw, ctx->bv, npages, ctx->len); | |
861 | return 0; | |
862 | } | |
82fb82be AA |
863 | |
864 | /** | |
865 | * cifs_alloc_hash - allocate hash and hash context together | |
866 | * | |
867 | * The caller has to make sure @sdesc is initialized to either NULL or | |
868 | * a valid context. Both can be freed via cifs_free_hash(). | |
869 | */ | |
870 | int | |
871 | cifs_alloc_hash(const char *name, | |
872 | struct crypto_shash **shash, struct sdesc **sdesc) | |
873 | { | |
874 | int rc = 0; | |
875 | size_t size; | |
876 | ||
877 | if (*sdesc != NULL) | |
878 | return 0; | |
879 | ||
880 | *shash = crypto_alloc_shash(name, 0, 0); | |
881 | if (IS_ERR(*shash)) { | |
882 | cifs_dbg(VFS, "could not allocate crypto %s\n", name); | |
883 | rc = PTR_ERR(*shash); | |
884 | *shash = NULL; | |
885 | *sdesc = NULL; | |
886 | return rc; | |
887 | } | |
888 | ||
889 | size = sizeof(struct shash_desc) + crypto_shash_descsize(*shash); | |
890 | *sdesc = kmalloc(size, GFP_KERNEL); | |
891 | if (*sdesc == NULL) { | |
892 | cifs_dbg(VFS, "no memory left to allocate crypto %s\n", name); | |
893 | crypto_free_shash(*shash); | |
894 | *shash = NULL; | |
895 | return -ENOMEM; | |
896 | } | |
897 | ||
898 | (*sdesc)->shash.tfm = *shash; | |
899 | (*sdesc)->shash.flags = 0x0; | |
900 | return 0; | |
901 | } | |
902 | ||
903 | /** | |
904 | * cifs_free_hash - free hash and hash context together | |
905 | * | |
906 | * Freeing a NULL hash or context is safe. | |
907 | */ | |
908 | void | |
909 | cifs_free_hash(struct crypto_shash **shash, struct sdesc **sdesc) | |
910 | { | |
911 | kfree(*sdesc); | |
912 | *sdesc = NULL; | |
913 | if (*shash) | |
914 | crypto_free_shash(*shash); | |
915 | *shash = NULL; | |
916 | } | |
7b7f2bdf LL |
917 | |
918 | /** | |
919 | * rqst_page_get_length - obtain the length and offset for a page in smb_rqst | |
920 | * Input: rqst - a smb_rqst, page - a page index for rqst | |
921 | * Output: *len - the length for this page, *offset - the offset for this page | |
922 | */ | |
923 | void rqst_page_get_length(struct smb_rqst *rqst, unsigned int page, | |
924 | unsigned int *len, unsigned int *offset) | |
925 | { | |
926 | *len = rqst->rq_pagesz; | |
927 | *offset = (page == 0) ? rqst->rq_offset : 0; | |
928 | ||
929 | if (rqst->rq_npages == 1 || page == rqst->rq_npages-1) | |
930 | *len = rqst->rq_tailsz; | |
931 | else if (page == 0) | |
932 | *len = rqst->rq_pagesz - rqst->rq_offset; | |
933 | } |