]>
Commit | Line | Data |
---|---|---|
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 | 113 | struct cifs_tcon *ret_buf; |
0544b324 JP |
114 | |
115 | ret_buf = kzalloc(sizeof(*ret_buf), GFP_KERNEL); | |
116 | if (!ret_buf) | |
117 | return NULL; | |
118 | ret_buf->crfid.fid = kzalloc(sizeof(*ret_buf->crfid.fid), GFP_KERNEL); | |
119 | if (!ret_buf->crfid.fid) { | |
120 | kfree(ret_buf); | |
121 | return NULL; | |
1da177e4 | 122 | } |
0544b324 JP |
123 | |
124 | atomic_inc(&tconInfoAllocCount); | |
125 | ret_buf->tidStatus = CifsNew; | |
126 | ++ret_buf->tc_count; | |
127 | INIT_LIST_HEAD(&ret_buf->openFileList); | |
128 | INIT_LIST_HEAD(&ret_buf->tcon_list); | |
129 | spin_lock_init(&ret_buf->open_file_lock); | |
130 | mutex_init(&ret_buf->crfid.fid_mutex); | |
131 | spin_lock_init(&ret_buf->stat_lock); | |
132 | atomic_set(&ret_buf->num_local_opens, 0); | |
133 | atomic_set(&ret_buf->num_remote_opens, 0); | |
134 | ||
1da177e4 LT |
135 | return ret_buf; |
136 | } | |
137 | ||
138 | void | |
96daf2b0 | 139 | tconInfoFree(struct cifs_tcon *buf_to_free) |
1da177e4 LT |
140 | { |
141 | if (buf_to_free == NULL) { | |
f96637be | 142 | cifs_dbg(FYI, "Null buffer passed to tconInfoFree\n"); |
1da177e4 LT |
143 | return; |
144 | } | |
1da177e4 | 145 | atomic_dec(&tconInfoAllocCount); |
f99d49ad | 146 | kfree(buf_to_free->nativeFileSystem); |
97f4b727 | 147 | kzfree(buf_to_free->password); |
a93864d9 | 148 | kfree(buf_to_free->crfid.fid); |
4a367dc0 PA |
149 | #ifdef CONFIG_CIFS_DFS_UPCALL |
150 | kfree(buf_to_free->dfs_path); | |
151 | #endif | |
1da177e4 LT |
152 | kfree(buf_to_free); |
153 | } | |
154 | ||
155 | struct smb_hdr * | |
156 | cifs_buf_get(void) | |
157 | { | |
158 | struct smb_hdr *ret_buf = NULL; | |
3792c173 PS |
159 | /* |
160 | * SMB2 header is bigger than CIFS one - no problems to clean some | |
161 | * more bytes for CIFS. | |
162 | */ | |
49f466bd | 163 | size_t buf_size = sizeof(struct smb2_sync_hdr); |
2a38e120 | 164 | |
3792c173 PS |
165 | /* |
166 | * We could use negotiated size instead of max_msgsize - | |
167 | * but it may be more efficient to always alloc same size | |
168 | * albeit slightly larger than necessary and maxbuffersize | |
169 | * defaults to this and can not be bigger. | |
170 | */ | |
232087cb | 171 | ret_buf = mempool_alloc(cifs_req_poolp, GFP_NOFS); |
1da177e4 LT |
172 | |
173 | /* clear the first few header bytes */ | |
174 | /* for most paths, more is cleared in header_assemble */ | |
a6f74e80 N |
175 | memset(ret_buf, 0, buf_size + 3); |
176 | atomic_inc(&bufAllocCount); | |
4498eed5 | 177 | #ifdef CONFIG_CIFS_STATS2 |
a6f74e80 | 178 | atomic_inc(&totBufAllocCount); |
4498eed5 | 179 | #endif /* CONFIG_CIFS_STATS2 */ |
1da177e4 LT |
180 | |
181 | return ret_buf; | |
182 | } | |
183 | ||
184 | void | |
185 | cifs_buf_release(void *buf_to_free) | |
186 | { | |
1da177e4 | 187 | if (buf_to_free == NULL) { |
f96637be | 188 | /* cifs_dbg(FYI, "Null buffer passed to cifs_buf_release\n");*/ |
1da177e4 LT |
189 | return; |
190 | } | |
fb8c4b14 | 191 | mempool_free(buf_to_free, cifs_req_poolp); |
1da177e4 LT |
192 | |
193 | atomic_dec(&bufAllocCount); | |
194 | return; | |
195 | } | |
196 | ||
197 | struct smb_hdr * | |
198 | cifs_small_buf_get(void) | |
199 | { | |
200 | struct smb_hdr *ret_buf = NULL; | |
201 | ||
fb8c4b14 SF |
202 | /* We could use negotiated size instead of max_msgsize - |
203 | but it may be more efficient to always alloc same size | |
204 | albeit slightly larger than necessary and maxbuffersize | |
1da177e4 | 205 | defaults to this and can not be bigger */ |
232087cb | 206 | ret_buf = mempool_alloc(cifs_sm_req_poolp, GFP_NOFS); |
1da177e4 LT |
207 | /* No need to clear memory here, cleared in header assemble */ |
208 | /* memset(ret_buf, 0, sizeof(struct smb_hdr) + 27);*/ | |
a6f74e80 | 209 | atomic_inc(&smBufAllocCount); |
4498eed5 | 210 | #ifdef CONFIG_CIFS_STATS2 |
a6f74e80 | 211 | atomic_inc(&totSmBufAllocCount); |
4498eed5 SF |
212 | #endif /* CONFIG_CIFS_STATS2 */ |
213 | ||
1da177e4 LT |
214 | return ret_buf; |
215 | } | |
216 | ||
217 | void | |
218 | cifs_small_buf_release(void *buf_to_free) | |
219 | { | |
220 | ||
221 | if (buf_to_free == NULL) { | |
f96637be | 222 | cifs_dbg(FYI, "Null buffer passed to cifs_small_buf_release\n"); |
1da177e4 LT |
223 | return; |
224 | } | |
fb8c4b14 | 225 | mempool_free(buf_to_free, cifs_sm_req_poolp); |
1da177e4 LT |
226 | |
227 | atomic_dec(&smBufAllocCount); | |
228 | return; | |
229 | } | |
230 | ||
6d81ed1e SP |
231 | void |
232 | free_rsp_buf(int resp_buftype, void *rsp) | |
233 | { | |
234 | if (resp_buftype == CIFS_SMALL_BUFFER) | |
235 | cifs_small_buf_release(rsp); | |
236 | else if (resp_buftype == CIFS_LARGE_BUFFER) | |
237 | cifs_buf_release(rsp); | |
238 | } | |
239 | ||
1982c344 SF |
240 | /* NB: MID can not be set if treeCon not passed in, in that |
241 | case it is responsbility of caller to set the mid */ | |
1da177e4 LT |
242 | void |
243 | header_assemble(struct smb_hdr *buffer, char smb_command /* command */ , | |
96daf2b0 | 244 | const struct cifs_tcon *treeCon, int word_count |
1da177e4 LT |
245 | /* length of fixed section (word count) in two byte units */) |
246 | { | |
1da177e4 LT |
247 | char *temp = (char *) buffer; |
248 | ||
fb8c4b14 | 249 | memset(temp, 0, 256); /* bigger than MAX_CIFS_HDR_SIZE */ |
1da177e4 | 250 | |
be8e3b00 | 251 | buffer->smb_buf_length = cpu_to_be32( |
630f3f0c | 252 | (2 * word_count) + sizeof(struct smb_hdr) - |
1da177e4 | 253 | 4 /* RFC 1001 length field does not count */ + |
be8e3b00 | 254 | 2 /* for bcc field itself */) ; |
1da177e4 LT |
255 | |
256 | buffer->Protocol[0] = 0xFF; | |
257 | buffer->Protocol[1] = 'S'; | |
258 | buffer->Protocol[2] = 'M'; | |
259 | buffer->Protocol[3] = 'B'; | |
260 | buffer->Command = smb_command; | |
261 | buffer->Flags = 0x00; /* case sensitive */ | |
262 | buffer->Flags2 = SMBFLG2_KNOWS_LONG_NAMES; | |
263 | buffer->Pid = cpu_to_le16((__u16)current->tgid); | |
264 | buffer->PidHigh = cpu_to_le16((__u16)(current->tgid >> 16)); | |
1da177e4 LT |
265 | if (treeCon) { |
266 | buffer->Tid = treeCon->tid; | |
267 | if (treeCon->ses) { | |
268 | if (treeCon->ses->capabilities & CAP_UNICODE) | |
269 | buffer->Flags2 |= SMBFLG2_UNICODE; | |
ad7a2926 | 270 | if (treeCon->ses->capabilities & CAP_STATUS32) |
1da177e4 | 271 | buffer->Flags2 |= SMBFLG2_ERR_STATUS; |
ad7a2926 | 272 | |
1982c344 SF |
273 | /* Uid is not converted */ |
274 | buffer->Uid = treeCon->ses->Suid; | |
88257360 | 275 | buffer->Mid = get_next_mid(treeCon->ses->server); |
1da177e4 LT |
276 | } |
277 | if (treeCon->Flags & SMB_SHARE_IS_IN_DFS) | |
278 | buffer->Flags2 |= SMBFLG2_DFS; | |
d3485d37 SF |
279 | if (treeCon->nocase) |
280 | buffer->Flags |= SMBFLG_CASELESS; | |
790fe579 | 281 | if ((treeCon->ses) && (treeCon->ses->server)) |
38d77c50 | 282 | if (treeCon->ses->server->sign) |
1da177e4 LT |
283 | buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE; |
284 | } | |
285 | ||
286 | /* endian conversion of flags is now done just before sending */ | |
287 | buffer->WordCount = (char) word_count; | |
288 | return; | |
289 | } | |
290 | ||
2cd646a2 | 291 | static int |
944d6f1a | 292 | check_smb_hdr(struct smb_hdr *smb) |
1da177e4 | 293 | { |
68abaffa JL |
294 | /* does it have the right SMB "signature" ? */ |
295 | if (*(__le32 *) smb->Protocol != cpu_to_le32(0x424d53ff)) { | |
f96637be JP |
296 | cifs_dbg(VFS, "Bad protocol string signature header 0x%x\n", |
297 | *(unsigned int *)smb->Protocol); | |
68abaffa JL |
298 | return 1; |
299 | } | |
300 | ||
68abaffa JL |
301 | /* if it's a response then accept */ |
302 | if (smb->Flags & SMBFLG_RESPONSE) | |
303 | return 0; | |
304 | ||
305 | /* only one valid case where server sends us request */ | |
306 | if (smb->Command == SMB_COM_LOCKING_ANDX) | |
307 | return 0; | |
308 | ||
3d378d3f TG |
309 | cifs_dbg(VFS, "Server sent request, not response. mid=%u\n", |
310 | get_mid(smb)); | |
1da177e4 LT |
311 | return 1; |
312 | } | |
313 | ||
314 | int | |
373512ec | 315 | checkSMB(char *buf, unsigned int total_read, struct TCP_Server_Info *server) |
1da177e4 | 316 | { |
d4e4854f | 317 | struct smb_hdr *smb = (struct smb_hdr *)buf; |
376b43f4 | 318 | __u32 rfclen = be32_to_cpu(smb->smb_buf_length); |
190fdeb8 | 319 | __u32 clc_len; /* calculated length */ |
f96637be JP |
320 | cifs_dbg(FYI, "checkSMB Length: 0x%x, smb_buf_length: 0x%x\n", |
321 | total_read, rfclen); | |
d103e164 | 322 | |
376b43f4 JL |
323 | /* is this frame too small to even get to a BCC? */ |
324 | if (total_read < 2 + sizeof(struct smb_hdr)) { | |
325 | if ((total_read >= sizeof(struct smb_hdr) - 1) | |
1da177e4 | 326 | && (smb->Status.CifsError != 0)) { |
376b43f4 | 327 | /* it's an error return */ |
d103e164 SF |
328 | smb->WordCount = 0; |
329 | /* some error cases do not return wct and bcc */ | |
330 | return 0; | |
376b43f4 | 331 | } else if ((total_read == sizeof(struct smb_hdr) + 1) && |
d103e164 | 332 | (smb->WordCount == 0)) { |
fb8c4b14 | 333 | char *tmp = (char *)smb; |
d103e164 SF |
334 | /* Need to work around a bug in two servers here */ |
335 | /* First, check if the part of bcc they sent was zero */ | |
336 | if (tmp[sizeof(struct smb_hdr)] == 0) { | |
337 | /* some servers return only half of bcc | |
338 | * on simple responses (wct, bcc both zero) | |
339 | * in particular have seen this on | |
340 | * ulogoffX and FindClose. This leaves | |
341 | * one byte of bcc potentially unitialized | |
342 | */ | |
343 | /* zero rest of bcc */ | |
344 | tmp[sizeof(struct smb_hdr)+1] = 0; | |
46c79a64 | 345 | return 0; |
1da177e4 | 346 | } |
f96637be | 347 | cifs_dbg(VFS, "rcvd invalid byte count (bcc)\n"); |
d103e164 | 348 | } else { |
f96637be | 349 | cifs_dbg(VFS, "Length less than smb header size\n"); |
1da177e4 | 350 | } |
376b43f4 | 351 | return -EIO; |
1da177e4 LT |
352 | } |
353 | ||
376b43f4 | 354 | /* otherwise, there is enough to get to the BCC */ |
944d6f1a | 355 | if (check_smb_hdr(smb)) |
376b43f4 | 356 | return -EIO; |
9ec672bd | 357 | clc_len = smbCalcSize(smb, server); |
184ed211 | 358 | |
376b43f4 | 359 | if (4 + rfclen != total_read) { |
f96637be JP |
360 | cifs_dbg(VFS, "Length read does not match RFC1001 length %d\n", |
361 | rfclen); | |
376b43f4 | 362 | return -EIO; |
184ed211 SF |
363 | } |
364 | ||
376b43f4 | 365 | if (4 + rfclen != clc_len) { |
3d378d3f | 366 | __u16 mid = get_mid(smb); |
184ed211 | 367 | /* check if bcc wrapped around for large read responses */ |
376b43f4 | 368 | if ((rfclen > 64 * 1024) && (rfclen > clc_len)) { |
184ed211 | 369 | /* check if lengths match mod 64K */ |
376b43f4 | 370 | if (((4 + rfclen) & 0xFFFF) == (clc_len & 0xFFFF)) |
fb8c4b14 | 371 | return 0; /* bcc wrapped */ |
184ed211 | 372 | } |
f96637be | 373 | cifs_dbg(FYI, "Calculated size %u vs length %u mismatch for mid=%u\n", |
3d378d3f | 374 | clc_len, 4 + rfclen, mid); |
6284644e | 375 | |
376b43f4 | 376 | if (4 + rfclen < clc_len) { |
f96637be | 377 | cifs_dbg(VFS, "RFC1001 size %u smaller than SMB for mid=%u\n", |
3d378d3f | 378 | rfclen, mid); |
376b43f4 JL |
379 | return -EIO; |
380 | } else if (rfclen > clc_len + 512) { | |
6284644e JL |
381 | /* |
382 | * Some servers (Windows XP in particular) send more | |
383 | * data than the lengths in the SMB packet would | |
384 | * indicate on certain calls (byte range locks and | |
385 | * trans2 find first calls in particular). While the | |
386 | * client can handle such a frame by ignoring the | |
387 | * trailing data, we choose limit the amount of extra | |
388 | * data to 512 bytes. | |
389 | */ | |
f96637be | 390 | cifs_dbg(VFS, "RFC1001 size %u more than 512 bytes larger than SMB for mid=%u\n", |
3d378d3f | 391 | rfclen, mid); |
376b43f4 | 392 | return -EIO; |
46c79a64 | 393 | } |
1da177e4 | 394 | } |
20962438 | 395 | return 0; |
1da177e4 | 396 | } |
4b18f2a9 SF |
397 | |
398 | bool | |
d4e4854f | 399 | is_valid_oplock_break(char *buffer, struct TCP_Server_Info *srv) |
fb8c4b14 | 400 | { |
d4e4854f | 401 | struct smb_hdr *buf = (struct smb_hdr *)buffer; |
fb8c4b14 | 402 | struct smb_com_lock_req *pSMB = (struct smb_com_lock_req *)buf; |
f1987b44 | 403 | struct list_head *tmp, *tmp1, *tmp2; |
96daf2b0 SF |
404 | struct cifs_ses *ses; |
405 | struct cifs_tcon *tcon; | |
f1987b44 | 406 | struct cifsInodeInfo *pCifsInode; |
1da177e4 LT |
407 | struct cifsFileInfo *netfile; |
408 | ||
f96637be | 409 | cifs_dbg(FYI, "Checking for oplock break or dnotify response\n"); |
790fe579 | 410 | if ((pSMB->hdr.Command == SMB_COM_NT_TRANSACT) && |
1da177e4 | 411 | (pSMB->hdr.Flags & SMBFLG_RESPONSE)) { |
fb8c4b14 | 412 | struct smb_com_transaction_change_notify_rsp *pSMBr = |
1da177e4 | 413 | (struct smb_com_transaction_change_notify_rsp *)buf; |
fb8c4b14 | 414 | struct file_notify_information *pnotify; |
1da177e4 | 415 | __u32 data_offset = 0; |
097f5863 DC |
416 | size_t len = srv->total_read - sizeof(pSMBr->hdr.smb_buf_length); |
417 | ||
820a803f | 418 | if (get_bcc(buf) > sizeof(struct file_notify_information)) { |
1da177e4 LT |
419 | data_offset = le32_to_cpu(pSMBr->DataOffset); |
420 | ||
097f5863 DC |
421 | if (data_offset > |
422 | len - sizeof(struct file_notify_information)) { | |
423 | cifs_dbg(FYI, "invalid data_offset %u\n", | |
424 | data_offset); | |
425 | return true; | |
426 | } | |
3979877e SF |
427 | pnotify = (struct file_notify_information *) |
428 | ((char *)&pSMBr->hdr.Protocol + data_offset); | |
f96637be | 429 | cifs_dbg(FYI, "dnotify on %s Action: 0x%x\n", |
b6b38f70 | 430 | pnotify->FileName, pnotify->Action); |
fb8c4b14 | 431 | /* cifs_dump_mem("Rcvd notify Data: ",buf, |
3979877e | 432 | sizeof(struct smb_hdr)+60); */ |
4b18f2a9 | 433 | return true; |
1da177e4 | 434 | } |
790fe579 | 435 | if (pSMBr->hdr.Status.CifsError) { |
59b04c5d | 436 | cifs_dbg(FYI, "notify err 0x%x\n", |
f96637be | 437 | pSMBr->hdr.Status.CifsError); |
4b18f2a9 | 438 | return true; |
1da177e4 | 439 | } |
4b18f2a9 | 440 | return false; |
fb8c4b14 | 441 | } |
790fe579 | 442 | if (pSMB->hdr.Command != SMB_COM_LOCKING_ANDX) |
4b18f2a9 | 443 | return false; |
790fe579 | 444 | if (pSMB->hdr.Flags & SMBFLG_RESPONSE) { |
1da177e4 LT |
445 | /* no sense logging error on invalid handle on oplock |
446 | break - harmless race between close request and oplock | |
447 | break response is expected from time to time writing out | |
448 | large dirty files cached on the client */ | |
fb8c4b14 SF |
449 | if ((NT_STATUS_INVALID_HANDLE) == |
450 | le32_to_cpu(pSMB->hdr.Status.CifsError)) { | |
f96637be | 451 | cifs_dbg(FYI, "invalid handle on oplock break\n"); |
4b18f2a9 | 452 | return true; |
fb8c4b14 | 453 | } else if (ERRbadfid == |
1da177e4 | 454 | le16_to_cpu(pSMB->hdr.Status.DosError.Error)) { |
4b18f2a9 | 455 | return true; |
1da177e4 | 456 | } else { |
4b18f2a9 | 457 | return false; /* on valid oplock brk we get "request" */ |
1da177e4 LT |
458 | } |
459 | } | |
790fe579 | 460 | if (pSMB->hdr.WordCount != 8) |
4b18f2a9 | 461 | return false; |
1da177e4 | 462 | |
59b04c5d | 463 | cifs_dbg(FYI, "oplock type 0x%x level 0x%x\n", |
b6b38f70 | 464 | pSMB->LockType, pSMB->OplockLevel); |
790fe579 | 465 | if (!(pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE)) |
4b18f2a9 | 466 | return false; |
1da177e4 LT |
467 | |
468 | /* look up tcon based on tid & uid */ | |
3f9bcca7 | 469 | spin_lock(&cifs_tcp_ses_lock); |
f1987b44 | 470 | list_for_each(tmp, &srv->smb_ses_list) { |
96daf2b0 | 471 | ses = list_entry(tmp, struct cifs_ses, smb_ses_list); |
f1987b44 | 472 | list_for_each(tmp1, &ses->tcon_list) { |
96daf2b0 | 473 | tcon = list_entry(tmp1, struct cifs_tcon, tcon_list); |
f1987b44 JL |
474 | if (tcon->tid != buf->Tid) |
475 | continue; | |
476 | ||
44c58186 | 477 | cifs_stats_inc(&tcon->stats.cifs_stats.num_oplock_brks); |
3afca265 | 478 | spin_lock(&tcon->open_file_lock); |
f1987b44 JL |
479 | list_for_each(tmp2, &tcon->openFileList) { |
480 | netfile = list_entry(tmp2, struct cifsFileInfo, | |
57337e42 | 481 | tlist); |
4b4de76e | 482 | if (pSMB->Fid != netfile->fid.netfid) |
f1987b44 JL |
483 | continue; |
484 | ||
f96637be | 485 | cifs_dbg(FYI, "file id match, oplock break\n"); |
2b0143b5 | 486 | pCifsInode = CIFS_I(d_inode(netfile->dentry)); |
9b646972 | 487 | |
c11f1df5 SP |
488 | set_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, |
489 | &pCifsInode->flags); | |
490 | ||
9bd45408 PS |
491 | netfile->oplock_epoch = 0; |
492 | netfile->oplock_level = pSMB->OplockLevel; | |
9b646972 | 493 | netfile->oplock_break_cancelled = false; |
9bd45408 | 494 | cifs_queue_oplock_break(netfile); |
9b646972 | 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) { | |
5fc7fcd0 AA |
525 | struct cifs_tcon *tcon = NULL; |
526 | ||
527 | if (cifs_sb->master_tlink) | |
528 | tcon = cifs_sb_master_tcon(cifs_sb); | |
529 | ||
f534dc99 | 530 | cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM; |
29fbeb7a | 531 | cifs_sb->mnt_cifs_serverino_autodisabled = true; |
5fc7fcd0 AA |
532 | cifs_dbg(VFS, "Autodisabling the use of server inode numbers on %s.\n", |
533 | tcon ? tcon->treeName : "new server"); | |
534 | cifs_dbg(VFS, "The server doesn't seem to support them properly or the files might be on different servers (DFS).\n"); | |
535 | cifs_dbg(VFS, "Hardlinks will not be recognized on this mount. Consider mounting with the \"noserverino\" option to silence this message.\n"); | |
536 | ||
ec06aedd JL |
537 | } |
538 | } | |
e66673e3 | 539 | |
c6723628 | 540 | void cifs_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock) |
e66673e3 | 541 | { |
c6723628 | 542 | oplock &= 0xF; |
e66673e3 | 543 | |
c6723628 | 544 | if (oplock == OPLOCK_EXCLUSIVE) { |
18cceb6a | 545 | cinode->oplock = CIFS_CACHE_WRITE_FLG | CIFS_CACHE_READ_FLG; |
f96637be JP |
546 | cifs_dbg(FYI, "Exclusive Oplock granted on inode %p\n", |
547 | &cinode->vfs_inode); | |
c6723628 | 548 | } else if (oplock == OPLOCK_READ) { |
18cceb6a | 549 | cinode->oplock = CIFS_CACHE_READ_FLG; |
f96637be JP |
550 | cifs_dbg(FYI, "Level II Oplock granted on inode %p\n", |
551 | &cinode->vfs_inode); | |
18cceb6a PS |
552 | } else |
553 | cinode->oplock = 0; | |
e66673e3 | 554 | } |
3d3ea8e6 | 555 | |
c11f1df5 SP |
556 | /* |
557 | * We wait for oplock breaks to be processed before we attempt to perform | |
558 | * writes. | |
559 | */ | |
560 | int cifs_get_writer(struct cifsInodeInfo *cinode) | |
561 | { | |
562 | int rc; | |
563 | ||
564 | start: | |
565 | rc = wait_on_bit(&cinode->flags, CIFS_INODE_PENDING_OPLOCK_BREAK, | |
74316201 | 566 | TASK_KILLABLE); |
c11f1df5 SP |
567 | if (rc) |
568 | return rc; | |
569 | ||
570 | spin_lock(&cinode->writers_lock); | |
571 | if (!cinode->writers) | |
572 | set_bit(CIFS_INODE_PENDING_WRITERS, &cinode->flags); | |
573 | cinode->writers++; | |
574 | /* Check to see if we have started servicing an oplock break */ | |
575 | if (test_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, &cinode->flags)) { | |
576 | cinode->writers--; | |
577 | if (cinode->writers == 0) { | |
578 | clear_bit(CIFS_INODE_PENDING_WRITERS, &cinode->flags); | |
579 | wake_up_bit(&cinode->flags, CIFS_INODE_PENDING_WRITERS); | |
580 | } | |
581 | spin_unlock(&cinode->writers_lock); | |
582 | goto start; | |
583 | } | |
584 | spin_unlock(&cinode->writers_lock); | |
585 | return 0; | |
586 | } | |
587 | ||
588 | void cifs_put_writer(struct cifsInodeInfo *cinode) | |
589 | { | |
590 | spin_lock(&cinode->writers_lock); | |
591 | cinode->writers--; | |
592 | if (cinode->writers == 0) { | |
593 | clear_bit(CIFS_INODE_PENDING_WRITERS, &cinode->flags); | |
594 | wake_up_bit(&cinode->flags, CIFS_INODE_PENDING_WRITERS); | |
595 | } | |
596 | spin_unlock(&cinode->writers_lock); | |
597 | } | |
598 | ||
b98749ca AA |
599 | /** |
600 | * cifs_queue_oplock_break - queue the oplock break handler for cfile | |
601 | * | |
602 | * This function is called from the demultiplex thread when it | |
603 | * receives an oplock break for @cfile. | |
604 | * | |
605 | * Assumes the tcon->open_file_lock is held. | |
606 | * Assumes cfile->file_info_lock is NOT held. | |
607 | */ | |
608 | void cifs_queue_oplock_break(struct cifsFileInfo *cfile) | |
609 | { | |
610 | /* | |
611 | * Bump the handle refcount now while we hold the | |
612 | * open_file_lock to enforce the validity of it for the oplock | |
613 | * break handler. The matching put is done at the end of the | |
614 | * handler. | |
615 | */ | |
616 | cifsFileInfo_get(cfile); | |
617 | ||
618 | queue_work(cifsoplockd_wq, &cfile->oplock_break); | |
619 | } | |
620 | ||
c11f1df5 SP |
621 | void cifs_done_oplock_break(struct cifsInodeInfo *cinode) |
622 | { | |
623 | clear_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, &cinode->flags); | |
624 | wake_up_bit(&cinode->flags, CIFS_INODE_PENDING_OPLOCK_BREAK); | |
625 | } | |
626 | ||
3d3ea8e6 SP |
627 | bool |
628 | backup_cred(struct cifs_sb_info *cifs_sb) | |
629 | { | |
630 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID) { | |
1f68233c | 631 | if (uid_eq(cifs_sb->mnt_backupuid, current_fsuid())) |
3d3ea8e6 SP |
632 | return true; |
633 | } | |
634 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID) { | |
635 | if (in_group_p(cifs_sb->mnt_backupgid)) | |
636 | return true; | |
637 | } | |
638 | ||
639 | return false; | |
640 | } | |
233839b1 PS |
641 | |
642 | void | |
643 | cifs_del_pending_open(struct cifs_pending_open *open) | |
644 | { | |
3afca265 | 645 | spin_lock(&tlink_tcon(open->tlink)->open_file_lock); |
233839b1 | 646 | list_del(&open->olist); |
3afca265 | 647 | spin_unlock(&tlink_tcon(open->tlink)->open_file_lock); |
233839b1 PS |
648 | } |
649 | ||
650 | void | |
651 | cifs_add_pending_open_locked(struct cifs_fid *fid, struct tcon_link *tlink, | |
652 | struct cifs_pending_open *open) | |
653 | { | |
233839b1 | 654 | memcpy(open->lease_key, fid->lease_key, SMB2_LEASE_KEY_SIZE); |
233839b1 PS |
655 | open->oplock = CIFS_OPLOCK_NO_CHANGE; |
656 | open->tlink = tlink; | |
657 | fid->pending_open = open; | |
658 | list_add_tail(&open->olist, &tlink_tcon(tlink)->pending_opens); | |
659 | } | |
660 | ||
661 | void | |
662 | cifs_add_pending_open(struct cifs_fid *fid, struct tcon_link *tlink, | |
663 | struct cifs_pending_open *open) | |
664 | { | |
3afca265 | 665 | spin_lock(&tlink_tcon(tlink)->open_file_lock); |
233839b1 | 666 | cifs_add_pending_open_locked(fid, tlink, open); |
3afca265 | 667 | spin_unlock(&tlink_tcon(open->tlink)->open_file_lock); |
233839b1 | 668 | } |
4ecce920 AA |
669 | |
670 | /* parses DFS refferal V3 structure | |
671 | * caller is responsible for freeing target_nodes | |
672 | * returns: | |
673 | * - on success - 0 | |
674 | * - on failure - errno | |
675 | */ | |
676 | int | |
677 | parse_dfs_referrals(struct get_dfs_referral_rsp *rsp, u32 rsp_size, | |
678 | unsigned int *num_of_nodes, | |
679 | struct dfs_info3_param **target_nodes, | |
680 | const struct nls_table *nls_codepage, int remap, | |
681 | const char *searchName, bool is_unicode) | |
682 | { | |
683 | int i, rc = 0; | |
684 | char *data_end; | |
685 | struct dfs_referral_level_3 *ref; | |
686 | ||
687 | *num_of_nodes = le16_to_cpu(rsp->NumberOfReferrals); | |
688 | ||
689 | if (*num_of_nodes < 1) { | |
690 | cifs_dbg(VFS, "num_referrals: must be at least > 0, but we get num_referrals = %d\n", | |
691 | *num_of_nodes); | |
692 | rc = -EINVAL; | |
693 | goto parse_DFS_referrals_exit; | |
694 | } | |
695 | ||
696 | ref = (struct dfs_referral_level_3 *) &(rsp->referrals); | |
697 | if (ref->VersionNumber != cpu_to_le16(3)) { | |
698 | cifs_dbg(VFS, "Referrals of V%d version are not supported, should be V3\n", | |
699 | le16_to_cpu(ref->VersionNumber)); | |
700 | rc = -EINVAL; | |
701 | goto parse_DFS_referrals_exit; | |
702 | } | |
703 | ||
704 | /* get the upper boundary of the resp buffer */ | |
705 | data_end = (char *)rsp + rsp_size; | |
706 | ||
707 | cifs_dbg(FYI, "num_referrals: %d dfs flags: 0x%x ...\n", | |
708 | *num_of_nodes, le32_to_cpu(rsp->DFSFlags)); | |
709 | ||
710 | *target_nodes = kcalloc(*num_of_nodes, sizeof(struct dfs_info3_param), | |
711 | GFP_KERNEL); | |
712 | if (*target_nodes == NULL) { | |
713 | rc = -ENOMEM; | |
714 | goto parse_DFS_referrals_exit; | |
715 | } | |
716 | ||
717 | /* collect necessary data from referrals */ | |
718 | for (i = 0; i < *num_of_nodes; i++) { | |
719 | char *temp; | |
720 | int max_len; | |
721 | struct dfs_info3_param *node = (*target_nodes)+i; | |
722 | ||
723 | node->flags = le32_to_cpu(rsp->DFSFlags); | |
724 | if (is_unicode) { | |
725 | __le16 *tmp = kmalloc(strlen(searchName)*2 + 2, | |
726 | GFP_KERNEL); | |
727 | if (tmp == NULL) { | |
728 | rc = -ENOMEM; | |
729 | goto parse_DFS_referrals_exit; | |
730 | } | |
731 | cifsConvertToUTF16((__le16 *) tmp, searchName, | |
732 | PATH_MAX, nls_codepage, remap); | |
733 | node->path_consumed = cifs_utf16_bytes(tmp, | |
734 | le16_to_cpu(rsp->PathConsumed), | |
735 | nls_codepage); | |
736 | kfree(tmp); | |
737 | } else | |
738 | node->path_consumed = le16_to_cpu(rsp->PathConsumed); | |
739 | ||
740 | node->server_type = le16_to_cpu(ref->ServerType); | |
741 | node->ref_flag = le16_to_cpu(ref->ReferralEntryFlags); | |
742 | ||
743 | /* copy DfsPath */ | |
744 | temp = (char *)ref + le16_to_cpu(ref->DfsPathOffset); | |
745 | max_len = data_end - temp; | |
746 | node->path_name = cifs_strndup_from_utf16(temp, max_len, | |
747 | is_unicode, nls_codepage); | |
748 | if (!node->path_name) { | |
749 | rc = -ENOMEM; | |
750 | goto parse_DFS_referrals_exit; | |
751 | } | |
752 | ||
753 | /* copy link target UNC */ | |
754 | temp = (char *)ref + le16_to_cpu(ref->NetworkAddressOffset); | |
755 | max_len = data_end - temp; | |
756 | node->node_name = cifs_strndup_from_utf16(temp, max_len, | |
757 | is_unicode, nls_codepage); | |
758 | if (!node->node_name) { | |
759 | rc = -ENOMEM; | |
760 | goto parse_DFS_referrals_exit; | |
761 | } | |
762 | ||
e7b602f4 PA |
763 | node->ttl = le32_to_cpu(ref->TimeToLive); |
764 | ||
4ecce920 AA |
765 | ref++; |
766 | } | |
767 | ||
768 | parse_DFS_referrals_exit: | |
769 | if (rc) { | |
770 | free_dfs_info_array(*target_nodes, *num_of_nodes); | |
771 | *target_nodes = NULL; | |
772 | *num_of_nodes = 0; | |
773 | } | |
774 | return rc; | |
775 | } | |
ccf7f408 PS |
776 | |
777 | struct cifs_aio_ctx * | |
778 | cifs_aio_ctx_alloc(void) | |
779 | { | |
780 | struct cifs_aio_ctx *ctx; | |
781 | ||
13f5938d JG |
782 | /* |
783 | * Must use kzalloc to initialize ctx->bv to NULL and ctx->direct_io | |
784 | * to false so that we know when we have to unreference pages within | |
785 | * cifs_aio_ctx_release() | |
786 | */ | |
ccf7f408 PS |
787 | ctx = kzalloc(sizeof(struct cifs_aio_ctx), GFP_KERNEL); |
788 | if (!ctx) | |
789 | return NULL; | |
790 | ||
791 | INIT_LIST_HEAD(&ctx->list); | |
792 | mutex_init(&ctx->aio_mutex); | |
793 | init_completion(&ctx->done); | |
794 | kref_init(&ctx->refcount); | |
795 | return ctx; | |
796 | } | |
797 | ||
798 | void | |
799 | cifs_aio_ctx_release(struct kref *refcount) | |
800 | { | |
801 | struct cifs_aio_ctx *ctx = container_of(refcount, | |
802 | struct cifs_aio_ctx, refcount); | |
803 | ||
804 | cifsFileInfo_put(ctx->cfile); | |
13f5938d JG |
805 | |
806 | /* | |
807 | * ctx->bv is only set if setup_aio_ctx_iter() was call successfuly | |
808 | * which means that iov_iter_get_pages() was a success and thus that | |
809 | * we have taken reference on pages. | |
810 | */ | |
811 | if (ctx->bv) { | |
812 | unsigned i; | |
813 | ||
814 | for (i = 0; i < ctx->npages; i++) { | |
815 | if (ctx->should_dirty) | |
816 | set_page_dirty(ctx->bv[i].bv_page); | |
817 | put_page(ctx->bv[i].bv_page); | |
818 | } | |
819 | kvfree(ctx->bv); | |
820 | } | |
821 | ||
ccf7f408 PS |
822 | kfree(ctx); |
823 | } | |
824 | ||
825 | #define CIFS_AIO_KMALLOC_LIMIT (1024 * 1024) | |
826 | ||
827 | int | |
828 | setup_aio_ctx_iter(struct cifs_aio_ctx *ctx, struct iov_iter *iter, int rw) | |
829 | { | |
830 | ssize_t rc; | |
831 | unsigned int cur_npages; | |
832 | unsigned int npages = 0; | |
833 | unsigned int i; | |
834 | size_t len; | |
835 | size_t count = iov_iter_count(iter); | |
836 | unsigned int saved_len; | |
837 | size_t start; | |
838 | unsigned int max_pages = iov_iter_npages(iter, INT_MAX); | |
839 | struct page **pages = NULL; | |
840 | struct bio_vec *bv = NULL; | |
841 | ||
00e23707 | 842 | if (iov_iter_is_kvec(iter)) { |
ccf7f408 PS |
843 | memcpy(&ctx->iter, iter, sizeof(struct iov_iter)); |
844 | ctx->len = count; | |
845 | iov_iter_advance(iter, count); | |
846 | return 0; | |
847 | } | |
848 | ||
849 | if (max_pages * sizeof(struct bio_vec) <= CIFS_AIO_KMALLOC_LIMIT) | |
850 | bv = kmalloc_array(max_pages, sizeof(struct bio_vec), | |
851 | GFP_KERNEL); | |
852 | ||
853 | if (!bv) { | |
42bc47b3 | 854 | bv = vmalloc(array_size(max_pages, sizeof(struct bio_vec))); |
ccf7f408 PS |
855 | if (!bv) |
856 | return -ENOMEM; | |
857 | } | |
858 | ||
859 | if (max_pages * sizeof(struct page *) <= CIFS_AIO_KMALLOC_LIMIT) | |
860 | pages = kmalloc_array(max_pages, sizeof(struct page *), | |
861 | GFP_KERNEL); | |
862 | ||
863 | if (!pages) { | |
42bc47b3 | 864 | pages = vmalloc(array_size(max_pages, sizeof(struct page *))); |
ecf3411a | 865 | if (!pages) { |
ccf7f408 PS |
866 | kvfree(bv); |
867 | return -ENOMEM; | |
868 | } | |
869 | } | |
870 | ||
871 | saved_len = count; | |
872 | ||
873 | while (count && npages < max_pages) { | |
874 | rc = iov_iter_get_pages(iter, pages, count, max_pages, &start); | |
875 | if (rc < 0) { | |
876 | cifs_dbg(VFS, "couldn't get user pages (rc=%zd)\n", rc); | |
877 | break; | |
878 | } | |
879 | ||
880 | if (rc > count) { | |
881 | cifs_dbg(VFS, "get pages rc=%zd more than %zu\n", rc, | |
882 | count); | |
883 | break; | |
884 | } | |
885 | ||
886 | iov_iter_advance(iter, rc); | |
887 | count -= rc; | |
888 | rc += start; | |
889 | cur_npages = DIV_ROUND_UP(rc, PAGE_SIZE); | |
890 | ||
891 | if (npages + cur_npages > max_pages) { | |
892 | cifs_dbg(VFS, "out of vec array capacity (%u vs %u)\n", | |
893 | npages + cur_npages, max_pages); | |
894 | break; | |
895 | } | |
896 | ||
897 | for (i = 0; i < cur_npages; i++) { | |
898 | len = rc > PAGE_SIZE ? PAGE_SIZE : rc; | |
899 | bv[npages + i].bv_page = pages[i]; | |
900 | bv[npages + i].bv_offset = start; | |
901 | bv[npages + i].bv_len = len - start; | |
902 | rc -= len; | |
903 | start = 0; | |
904 | } | |
905 | ||
906 | npages += cur_npages; | |
907 | } | |
908 | ||
909 | kvfree(pages); | |
910 | ctx->bv = bv; | |
911 | ctx->len = saved_len - count; | |
912 | ctx->npages = npages; | |
aa563d7b | 913 | iov_iter_bvec(&ctx->iter, rw, ctx->bv, npages, ctx->len); |
ccf7f408 PS |
914 | return 0; |
915 | } | |
82fb82be AA |
916 | |
917 | /** | |
918 | * cifs_alloc_hash - allocate hash and hash context together | |
919 | * | |
920 | * The caller has to make sure @sdesc is initialized to either NULL or | |
921 | * a valid context. Both can be freed via cifs_free_hash(). | |
922 | */ | |
923 | int | |
924 | cifs_alloc_hash(const char *name, | |
925 | struct crypto_shash **shash, struct sdesc **sdesc) | |
926 | { | |
927 | int rc = 0; | |
928 | size_t size; | |
929 | ||
930 | if (*sdesc != NULL) | |
931 | return 0; | |
932 | ||
933 | *shash = crypto_alloc_shash(name, 0, 0); | |
934 | if (IS_ERR(*shash)) { | |
935 | cifs_dbg(VFS, "could not allocate crypto %s\n", name); | |
936 | rc = PTR_ERR(*shash); | |
937 | *shash = NULL; | |
938 | *sdesc = NULL; | |
939 | return rc; | |
940 | } | |
941 | ||
942 | size = sizeof(struct shash_desc) + crypto_shash_descsize(*shash); | |
943 | *sdesc = kmalloc(size, GFP_KERNEL); | |
944 | if (*sdesc == NULL) { | |
945 | cifs_dbg(VFS, "no memory left to allocate crypto %s\n", name); | |
946 | crypto_free_shash(*shash); | |
947 | *shash = NULL; | |
948 | return -ENOMEM; | |
949 | } | |
950 | ||
951 | (*sdesc)->shash.tfm = *shash; | |
82fb82be AA |
952 | return 0; |
953 | } | |
954 | ||
955 | /** | |
956 | * cifs_free_hash - free hash and hash context together | |
957 | * | |
958 | * Freeing a NULL hash or context is safe. | |
959 | */ | |
960 | void | |
961 | cifs_free_hash(struct crypto_shash **shash, struct sdesc **sdesc) | |
962 | { | |
963 | kfree(*sdesc); | |
964 | *sdesc = NULL; | |
965 | if (*shash) | |
966 | crypto_free_shash(*shash); | |
967 | *shash = NULL; | |
968 | } | |
7b7f2bdf LL |
969 | |
970 | /** | |
971 | * rqst_page_get_length - obtain the length and offset for a page in smb_rqst | |
972 | * Input: rqst - a smb_rqst, page - a page index for rqst | |
973 | * Output: *len - the length for this page, *offset - the offset for this page | |
974 | */ | |
975 | void rqst_page_get_length(struct smb_rqst *rqst, unsigned int page, | |
976 | unsigned int *len, unsigned int *offset) | |
977 | { | |
978 | *len = rqst->rq_pagesz; | |
979 | *offset = (page == 0) ? rqst->rq_offset : 0; | |
980 | ||
981 | if (rqst->rq_npages == 1 || page == rqst->rq_npages-1) | |
982 | *len = rqst->rq_tailsz; | |
983 | else if (page == 0) | |
984 | *len = rqst->rq_pagesz - rqst->rq_offset; | |
985 | } | |
a3a53b76 PA |
986 | |
987 | void extract_unc_hostname(const char *unc, const char **h, size_t *len) | |
988 | { | |
989 | const char *end; | |
990 | ||
991 | /* skip initial slashes */ | |
992 | while (*unc && (*unc == '\\' || *unc == '/')) | |
993 | unc++; | |
994 | ||
995 | end = unc; | |
996 | ||
997 | while (*end && !(*end == '\\' || *end == '/')) | |
998 | end++; | |
999 | ||
1000 | *h = unc; | |
1001 | *len = end - unc; | |
1002 | } | |
340625e6 RS |
1003 | |
1004 | /** | |
1005 | * copy_path_name - copy src path to dst, possibly truncating | |
1006 | * | |
1007 | * returns number of bytes written (including trailing nul) | |
1008 | */ | |
1009 | int copy_path_name(char *dst, const char *src) | |
1010 | { | |
1011 | int name_len; | |
1012 | ||
1013 | /* | |
1014 | * PATH_MAX includes nul, so if strlen(src) >= PATH_MAX it | |
1015 | * will truncate and strlen(dst) will be PATH_MAX-1 | |
1016 | */ | |
1017 | name_len = strscpy(dst, src, PATH_MAX); | |
1018 | if (WARN_ON_ONCE(name_len < 0)) | |
1019 | name_len = PATH_MAX-1; | |
1020 | ||
1021 | /* we count the trailing nul */ | |
1022 | name_len++; | |
1023 | return name_len; | |
1024 | } |