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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" |
bacd704a | 34 | #include "cifsfs.h" |
e4af35fa PA |
35 | #ifdef CONFIG_CIFS_DFS_UPCALL |
36 | #include "dns_resolve.h" | |
37 | #endif | |
1da177e4 LT |
38 | |
39 | extern mempool_t *cifs_sm_req_poolp; | |
40 | extern mempool_t *cifs_req_poolp; | |
1da177e4 | 41 | |
fb8c4b14 SF |
42 | /* The xid serves as a useful identifier for each incoming vfs request, |
43 | in a similar way to the mid which is useful to track each sent smb, | |
44 | and CurrentXid can also provide a running counter (although it | |
45 | will eventually wrap past zero) of the total vfs operations handled | |
1da177e4 LT |
46 | since the cifs fs was mounted */ |
47 | ||
48 | unsigned int | |
6d5786a3 | 49 | _get_xid(void) |
1da177e4 LT |
50 | { |
51 | unsigned int xid; | |
52 | ||
53 | spin_lock(&GlobalMid_Lock); | |
54 | GlobalTotalActiveXid++; | |
50c2f753 SF |
55 | |
56 | /* keep high water mark for number of simultaneous ops in filesystem */ | |
1da177e4 | 57 | if (GlobalTotalActiveXid > GlobalMaxActiveXid) |
50c2f753 | 58 | GlobalMaxActiveXid = GlobalTotalActiveXid; |
790fe579 | 59 | if (GlobalTotalActiveXid > 65000) |
f96637be | 60 | cifs_dbg(FYI, "warning: more than 65000 requests active\n"); |
1da177e4 LT |
61 | xid = GlobalCurrentXid++; |
62 | spin_unlock(&GlobalMid_Lock); | |
63 | return xid; | |
64 | } | |
65 | ||
66 | void | |
6d5786a3 | 67 | _free_xid(unsigned int xid) |
1da177e4 LT |
68 | { |
69 | spin_lock(&GlobalMid_Lock); | |
790fe579 | 70 | /* if (GlobalTotalActiveXid == 0) |
1da177e4 LT |
71 | BUG(); */ |
72 | GlobalTotalActiveXid--; | |
73 | spin_unlock(&GlobalMid_Lock); | |
74 | } | |
75 | ||
96daf2b0 | 76 | struct cifs_ses * |
1da177e4 LT |
77 | sesInfoAlloc(void) |
78 | { | |
96daf2b0 | 79 | struct cifs_ses *ret_buf; |
1da177e4 | 80 | |
96daf2b0 | 81 | ret_buf = kzalloc(sizeof(struct cifs_ses), GFP_KERNEL); |
1da177e4 | 82 | if (ret_buf) { |
1da177e4 LT |
83 | atomic_inc(&sesInfoAllocCount); |
84 | ret_buf->status = CifsNew; | |
14fbf50d JL |
85 | ++ret_buf->ses_count; |
86 | INIT_LIST_HEAD(&ret_buf->smb_ses_list); | |
f1987b44 | 87 | INIT_LIST_HEAD(&ret_buf->tcon_list); |
d7b619cf | 88 | mutex_init(&ret_buf->session_mutex); |
b6f0dd5d | 89 | spin_lock_init(&ret_buf->iface_lock); |
1da177e4 LT |
90 | } |
91 | return ret_buf; | |
92 | } | |
93 | ||
94 | void | |
96daf2b0 | 95 | sesInfoFree(struct cifs_ses *buf_to_free) |
1da177e4 LT |
96 | { |
97 | if (buf_to_free == NULL) { | |
f96637be | 98 | cifs_dbg(FYI, "Null buffer passed to sesInfoFree\n"); |
1da177e4 LT |
99 | return; |
100 | } | |
101 | ||
1da177e4 | 102 | atomic_dec(&sesInfoAllocCount); |
f99d49ad JJ |
103 | kfree(buf_to_free->serverOS); |
104 | kfree(buf_to_free->serverDomain); | |
105 | kfree(buf_to_free->serverNOS); | |
453431a5 | 106 | kfree_sensitive(buf_to_free->password); |
8727c8a8 | 107 | kfree(buf_to_free->user_name); |
3979877e | 108 | kfree(buf_to_free->domainName); |
453431a5 | 109 | kfree_sensitive(buf_to_free->auth_key.response); |
b6f0dd5d | 110 | kfree(buf_to_free->iface_list); |
453431a5 | 111 | kfree_sensitive(buf_to_free); |
1da177e4 LT |
112 | } |
113 | ||
96daf2b0 | 114 | struct cifs_tcon * |
1da177e4 LT |
115 | tconInfoAlloc(void) |
116 | { | |
96daf2b0 | 117 | struct cifs_tcon *ret_buf; |
0544b324 JP |
118 | |
119 | ret_buf = kzalloc(sizeof(*ret_buf), GFP_KERNEL); | |
120 | if (!ret_buf) | |
121 | return NULL; | |
122 | ret_buf->crfid.fid = kzalloc(sizeof(*ret_buf->crfid.fid), GFP_KERNEL); | |
123 | if (!ret_buf->crfid.fid) { | |
124 | kfree(ret_buf); | |
125 | return NULL; | |
1da177e4 | 126 | } |
0544b324 JP |
127 | |
128 | atomic_inc(&tconInfoAllocCount); | |
129 | ret_buf->tidStatus = CifsNew; | |
130 | ++ret_buf->tc_count; | |
131 | INIT_LIST_HEAD(&ret_buf->openFileList); | |
132 | INIT_LIST_HEAD(&ret_buf->tcon_list); | |
133 | spin_lock_init(&ret_buf->open_file_lock); | |
134 | mutex_init(&ret_buf->crfid.fid_mutex); | |
135 | spin_lock_init(&ret_buf->stat_lock); | |
136 | atomic_set(&ret_buf->num_local_opens, 0); | |
137 | atomic_set(&ret_buf->num_remote_opens, 0); | |
138 | ||
1da177e4 LT |
139 | return ret_buf; |
140 | } | |
141 | ||
142 | void | |
96daf2b0 | 143 | tconInfoFree(struct cifs_tcon *buf_to_free) |
1da177e4 LT |
144 | { |
145 | if (buf_to_free == NULL) { | |
f96637be | 146 | cifs_dbg(FYI, "Null buffer passed to tconInfoFree\n"); |
1da177e4 LT |
147 | return; |
148 | } | |
1da177e4 | 149 | atomic_dec(&tconInfoAllocCount); |
f99d49ad | 150 | kfree(buf_to_free->nativeFileSystem); |
453431a5 | 151 | kfree_sensitive(buf_to_free->password); |
a93864d9 | 152 | kfree(buf_to_free->crfid.fid); |
4a367dc0 PA |
153 | #ifdef CONFIG_CIFS_DFS_UPCALL |
154 | kfree(buf_to_free->dfs_path); | |
155 | #endif | |
1da177e4 LT |
156 | kfree(buf_to_free); |
157 | } | |
158 | ||
159 | struct smb_hdr * | |
160 | cifs_buf_get(void) | |
161 | { | |
162 | struct smb_hdr *ret_buf = NULL; | |
3792c173 PS |
163 | /* |
164 | * SMB2 header is bigger than CIFS one - no problems to clean some | |
165 | * more bytes for CIFS. | |
166 | */ | |
49f466bd | 167 | size_t buf_size = sizeof(struct smb2_sync_hdr); |
2a38e120 | 168 | |
3792c173 PS |
169 | /* |
170 | * We could use negotiated size instead of max_msgsize - | |
171 | * but it may be more efficient to always alloc same size | |
172 | * albeit slightly larger than necessary and maxbuffersize | |
173 | * defaults to this and can not be bigger. | |
174 | */ | |
232087cb | 175 | ret_buf = mempool_alloc(cifs_req_poolp, GFP_NOFS); |
1da177e4 LT |
176 | |
177 | /* clear the first few header bytes */ | |
178 | /* for most paths, more is cleared in header_assemble */ | |
a6f74e80 N |
179 | memset(ret_buf, 0, buf_size + 3); |
180 | atomic_inc(&bufAllocCount); | |
4498eed5 | 181 | #ifdef CONFIG_CIFS_STATS2 |
a6f74e80 | 182 | atomic_inc(&totBufAllocCount); |
4498eed5 | 183 | #endif /* CONFIG_CIFS_STATS2 */ |
1da177e4 LT |
184 | |
185 | return ret_buf; | |
186 | } | |
187 | ||
188 | void | |
189 | cifs_buf_release(void *buf_to_free) | |
190 | { | |
1da177e4 | 191 | if (buf_to_free == NULL) { |
f96637be | 192 | /* cifs_dbg(FYI, "Null buffer passed to cifs_buf_release\n");*/ |
1da177e4 LT |
193 | return; |
194 | } | |
fb8c4b14 | 195 | mempool_free(buf_to_free, cifs_req_poolp); |
1da177e4 LT |
196 | |
197 | atomic_dec(&bufAllocCount); | |
198 | return; | |
199 | } | |
200 | ||
201 | struct smb_hdr * | |
202 | cifs_small_buf_get(void) | |
203 | { | |
204 | struct smb_hdr *ret_buf = NULL; | |
205 | ||
fb8c4b14 SF |
206 | /* We could use negotiated size instead of max_msgsize - |
207 | but it may be more efficient to always alloc same size | |
208 | albeit slightly larger than necessary and maxbuffersize | |
1da177e4 | 209 | defaults to this and can not be bigger */ |
232087cb | 210 | ret_buf = mempool_alloc(cifs_sm_req_poolp, GFP_NOFS); |
1da177e4 LT |
211 | /* No need to clear memory here, cleared in header assemble */ |
212 | /* memset(ret_buf, 0, sizeof(struct smb_hdr) + 27);*/ | |
a6f74e80 | 213 | atomic_inc(&smBufAllocCount); |
4498eed5 | 214 | #ifdef CONFIG_CIFS_STATS2 |
a6f74e80 | 215 | atomic_inc(&totSmBufAllocCount); |
4498eed5 SF |
216 | #endif /* CONFIG_CIFS_STATS2 */ |
217 | ||
1da177e4 LT |
218 | return ret_buf; |
219 | } | |
220 | ||
221 | void | |
222 | cifs_small_buf_release(void *buf_to_free) | |
223 | { | |
224 | ||
225 | if (buf_to_free == NULL) { | |
f96637be | 226 | cifs_dbg(FYI, "Null buffer passed to cifs_small_buf_release\n"); |
1da177e4 LT |
227 | return; |
228 | } | |
fb8c4b14 | 229 | mempool_free(buf_to_free, cifs_sm_req_poolp); |
1da177e4 LT |
230 | |
231 | atomic_dec(&smBufAllocCount); | |
232 | return; | |
233 | } | |
234 | ||
6d81ed1e SP |
235 | void |
236 | free_rsp_buf(int resp_buftype, void *rsp) | |
237 | { | |
238 | if (resp_buftype == CIFS_SMALL_BUFFER) | |
239 | cifs_small_buf_release(rsp); | |
240 | else if (resp_buftype == CIFS_LARGE_BUFFER) | |
241 | cifs_buf_release(rsp); | |
242 | } | |
243 | ||
1982c344 SF |
244 | /* NB: MID can not be set if treeCon not passed in, in that |
245 | case it is responsbility of caller to set the mid */ | |
1da177e4 LT |
246 | void |
247 | header_assemble(struct smb_hdr *buffer, char smb_command /* command */ , | |
96daf2b0 | 248 | const struct cifs_tcon *treeCon, int word_count |
1da177e4 LT |
249 | /* length of fixed section (word count) in two byte units */) |
250 | { | |
1da177e4 LT |
251 | char *temp = (char *) buffer; |
252 | ||
fb8c4b14 | 253 | memset(temp, 0, 256); /* bigger than MAX_CIFS_HDR_SIZE */ |
1da177e4 | 254 | |
be8e3b00 | 255 | buffer->smb_buf_length = cpu_to_be32( |
630f3f0c | 256 | (2 * word_count) + sizeof(struct smb_hdr) - |
1da177e4 | 257 | 4 /* RFC 1001 length field does not count */ + |
be8e3b00 | 258 | 2 /* for bcc field itself */) ; |
1da177e4 LT |
259 | |
260 | buffer->Protocol[0] = 0xFF; | |
261 | buffer->Protocol[1] = 'S'; | |
262 | buffer->Protocol[2] = 'M'; | |
263 | buffer->Protocol[3] = 'B'; | |
264 | buffer->Command = smb_command; | |
265 | buffer->Flags = 0x00; /* case sensitive */ | |
266 | buffer->Flags2 = SMBFLG2_KNOWS_LONG_NAMES; | |
267 | buffer->Pid = cpu_to_le16((__u16)current->tgid); | |
268 | buffer->PidHigh = cpu_to_le16((__u16)(current->tgid >> 16)); | |
1da177e4 LT |
269 | if (treeCon) { |
270 | buffer->Tid = treeCon->tid; | |
271 | if (treeCon->ses) { | |
272 | if (treeCon->ses->capabilities & CAP_UNICODE) | |
273 | buffer->Flags2 |= SMBFLG2_UNICODE; | |
ad7a2926 | 274 | if (treeCon->ses->capabilities & CAP_STATUS32) |
1da177e4 | 275 | buffer->Flags2 |= SMBFLG2_ERR_STATUS; |
ad7a2926 | 276 | |
1982c344 SF |
277 | /* Uid is not converted */ |
278 | buffer->Uid = treeCon->ses->Suid; | |
88257360 | 279 | buffer->Mid = get_next_mid(treeCon->ses->server); |
1da177e4 LT |
280 | } |
281 | if (treeCon->Flags & SMB_SHARE_IS_IN_DFS) | |
282 | buffer->Flags2 |= SMBFLG2_DFS; | |
d3485d37 SF |
283 | if (treeCon->nocase) |
284 | buffer->Flags |= SMBFLG_CASELESS; | |
790fe579 | 285 | if ((treeCon->ses) && (treeCon->ses->server)) |
38d77c50 | 286 | if (treeCon->ses->server->sign) |
1da177e4 LT |
287 | buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE; |
288 | } | |
289 | ||
290 | /* endian conversion of flags is now done just before sending */ | |
291 | buffer->WordCount = (char) word_count; | |
292 | return; | |
293 | } | |
294 | ||
2cd646a2 | 295 | static int |
944d6f1a | 296 | check_smb_hdr(struct smb_hdr *smb) |
1da177e4 | 297 | { |
68abaffa JL |
298 | /* does it have the right SMB "signature" ? */ |
299 | if (*(__le32 *) smb->Protocol != cpu_to_le32(0x424d53ff)) { | |
f96637be JP |
300 | cifs_dbg(VFS, "Bad protocol string signature header 0x%x\n", |
301 | *(unsigned int *)smb->Protocol); | |
68abaffa JL |
302 | return 1; |
303 | } | |
304 | ||
68abaffa JL |
305 | /* if it's a response then accept */ |
306 | if (smb->Flags & SMBFLG_RESPONSE) | |
307 | return 0; | |
308 | ||
309 | /* only one valid case where server sends us request */ | |
310 | if (smb->Command == SMB_COM_LOCKING_ANDX) | |
311 | return 0; | |
312 | ||
3d378d3f TG |
313 | cifs_dbg(VFS, "Server sent request, not response. mid=%u\n", |
314 | get_mid(smb)); | |
1da177e4 LT |
315 | return 1; |
316 | } | |
317 | ||
318 | int | |
373512ec | 319 | checkSMB(char *buf, unsigned int total_read, struct TCP_Server_Info *server) |
1da177e4 | 320 | { |
d4e4854f | 321 | struct smb_hdr *smb = (struct smb_hdr *)buf; |
376b43f4 | 322 | __u32 rfclen = be32_to_cpu(smb->smb_buf_length); |
190fdeb8 | 323 | __u32 clc_len; /* calculated length */ |
f96637be JP |
324 | cifs_dbg(FYI, "checkSMB Length: 0x%x, smb_buf_length: 0x%x\n", |
325 | total_read, rfclen); | |
d103e164 | 326 | |
376b43f4 JL |
327 | /* is this frame too small to even get to a BCC? */ |
328 | if (total_read < 2 + sizeof(struct smb_hdr)) { | |
329 | if ((total_read >= sizeof(struct smb_hdr) - 1) | |
1da177e4 | 330 | && (smb->Status.CifsError != 0)) { |
376b43f4 | 331 | /* it's an error return */ |
d103e164 SF |
332 | smb->WordCount = 0; |
333 | /* some error cases do not return wct and bcc */ | |
334 | return 0; | |
376b43f4 | 335 | } else if ((total_read == sizeof(struct smb_hdr) + 1) && |
d103e164 | 336 | (smb->WordCount == 0)) { |
fb8c4b14 | 337 | char *tmp = (char *)smb; |
d103e164 SF |
338 | /* Need to work around a bug in two servers here */ |
339 | /* First, check if the part of bcc they sent was zero */ | |
340 | if (tmp[sizeof(struct smb_hdr)] == 0) { | |
341 | /* some servers return only half of bcc | |
342 | * on simple responses (wct, bcc both zero) | |
343 | * in particular have seen this on | |
344 | * ulogoffX and FindClose. This leaves | |
345 | * one byte of bcc potentially unitialized | |
346 | */ | |
347 | /* zero rest of bcc */ | |
348 | tmp[sizeof(struct smb_hdr)+1] = 0; | |
46c79a64 | 349 | return 0; |
1da177e4 | 350 | } |
f96637be | 351 | cifs_dbg(VFS, "rcvd invalid byte count (bcc)\n"); |
d103e164 | 352 | } else { |
f96637be | 353 | cifs_dbg(VFS, "Length less than smb header size\n"); |
1da177e4 | 354 | } |
376b43f4 | 355 | return -EIO; |
1da177e4 LT |
356 | } |
357 | ||
376b43f4 | 358 | /* otherwise, there is enough to get to the BCC */ |
944d6f1a | 359 | if (check_smb_hdr(smb)) |
376b43f4 | 360 | return -EIO; |
9ec672bd | 361 | clc_len = smbCalcSize(smb, server); |
184ed211 | 362 | |
376b43f4 | 363 | if (4 + rfclen != total_read) { |
f96637be JP |
364 | cifs_dbg(VFS, "Length read does not match RFC1001 length %d\n", |
365 | rfclen); | |
376b43f4 | 366 | return -EIO; |
184ed211 SF |
367 | } |
368 | ||
376b43f4 | 369 | if (4 + rfclen != clc_len) { |
3d378d3f | 370 | __u16 mid = get_mid(smb); |
184ed211 | 371 | /* check if bcc wrapped around for large read responses */ |
376b43f4 | 372 | if ((rfclen > 64 * 1024) && (rfclen > clc_len)) { |
184ed211 | 373 | /* check if lengths match mod 64K */ |
376b43f4 | 374 | if (((4 + rfclen) & 0xFFFF) == (clc_len & 0xFFFF)) |
fb8c4b14 | 375 | return 0; /* bcc wrapped */ |
184ed211 | 376 | } |
f96637be | 377 | cifs_dbg(FYI, "Calculated size %u vs length %u mismatch for mid=%u\n", |
3d378d3f | 378 | clc_len, 4 + rfclen, mid); |
6284644e | 379 | |
376b43f4 | 380 | if (4 + rfclen < clc_len) { |
f96637be | 381 | cifs_dbg(VFS, "RFC1001 size %u smaller than SMB for mid=%u\n", |
3d378d3f | 382 | rfclen, mid); |
376b43f4 JL |
383 | return -EIO; |
384 | } else if (rfclen > clc_len + 512) { | |
6284644e JL |
385 | /* |
386 | * Some servers (Windows XP in particular) send more | |
387 | * data than the lengths in the SMB packet would | |
388 | * indicate on certain calls (byte range locks and | |
389 | * trans2 find first calls in particular). While the | |
390 | * client can handle such a frame by ignoring the | |
391 | * trailing data, we choose limit the amount of extra | |
392 | * data to 512 bytes. | |
393 | */ | |
f96637be | 394 | cifs_dbg(VFS, "RFC1001 size %u more than 512 bytes larger than SMB for mid=%u\n", |
3d378d3f | 395 | rfclen, mid); |
376b43f4 | 396 | return -EIO; |
46c79a64 | 397 | } |
1da177e4 | 398 | } |
20962438 | 399 | return 0; |
1da177e4 | 400 | } |
4b18f2a9 SF |
401 | |
402 | bool | |
d4e4854f | 403 | is_valid_oplock_break(char *buffer, struct TCP_Server_Info *srv) |
fb8c4b14 | 404 | { |
d4e4854f | 405 | struct smb_hdr *buf = (struct smb_hdr *)buffer; |
fb8c4b14 | 406 | struct smb_com_lock_req *pSMB = (struct smb_com_lock_req *)buf; |
f1987b44 | 407 | struct list_head *tmp, *tmp1, *tmp2; |
96daf2b0 SF |
408 | struct cifs_ses *ses; |
409 | struct cifs_tcon *tcon; | |
f1987b44 | 410 | struct cifsInodeInfo *pCifsInode; |
1da177e4 LT |
411 | struct cifsFileInfo *netfile; |
412 | ||
f96637be | 413 | cifs_dbg(FYI, "Checking for oplock break or dnotify response\n"); |
790fe579 | 414 | if ((pSMB->hdr.Command == SMB_COM_NT_TRANSACT) && |
1da177e4 | 415 | (pSMB->hdr.Flags & SMBFLG_RESPONSE)) { |
fb8c4b14 | 416 | struct smb_com_transaction_change_notify_rsp *pSMBr = |
1da177e4 | 417 | (struct smb_com_transaction_change_notify_rsp *)buf; |
fb8c4b14 | 418 | struct file_notify_information *pnotify; |
1da177e4 | 419 | __u32 data_offset = 0; |
097f5863 DC |
420 | size_t len = srv->total_read - sizeof(pSMBr->hdr.smb_buf_length); |
421 | ||
820a803f | 422 | if (get_bcc(buf) > sizeof(struct file_notify_information)) { |
1da177e4 LT |
423 | data_offset = le32_to_cpu(pSMBr->DataOffset); |
424 | ||
097f5863 DC |
425 | if (data_offset > |
426 | len - sizeof(struct file_notify_information)) { | |
a0a3036b | 427 | cifs_dbg(FYI, "Invalid data_offset %u\n", |
097f5863 DC |
428 | data_offset); |
429 | return true; | |
430 | } | |
3979877e SF |
431 | pnotify = (struct file_notify_information *) |
432 | ((char *)&pSMBr->hdr.Protocol + data_offset); | |
f96637be | 433 | cifs_dbg(FYI, "dnotify on %s Action: 0x%x\n", |
b6b38f70 | 434 | pnotify->FileName, pnotify->Action); |
fb8c4b14 | 435 | /* cifs_dump_mem("Rcvd notify Data: ",buf, |
3979877e | 436 | sizeof(struct smb_hdr)+60); */ |
4b18f2a9 | 437 | return true; |
1da177e4 | 438 | } |
790fe579 | 439 | if (pSMBr->hdr.Status.CifsError) { |
59b04c5d | 440 | cifs_dbg(FYI, "notify err 0x%x\n", |
f96637be | 441 | pSMBr->hdr.Status.CifsError); |
4b18f2a9 | 442 | return true; |
1da177e4 | 443 | } |
4b18f2a9 | 444 | return false; |
fb8c4b14 | 445 | } |
790fe579 | 446 | if (pSMB->hdr.Command != SMB_COM_LOCKING_ANDX) |
4b18f2a9 | 447 | return false; |
790fe579 | 448 | if (pSMB->hdr.Flags & SMBFLG_RESPONSE) { |
1da177e4 LT |
449 | /* no sense logging error on invalid handle on oplock |
450 | break - harmless race between close request and oplock | |
451 | break response is expected from time to time writing out | |
452 | large dirty files cached on the client */ | |
fb8c4b14 SF |
453 | if ((NT_STATUS_INVALID_HANDLE) == |
454 | le32_to_cpu(pSMB->hdr.Status.CifsError)) { | |
a0a3036b | 455 | cifs_dbg(FYI, "Invalid handle on oplock break\n"); |
4b18f2a9 | 456 | return true; |
fb8c4b14 | 457 | } else if (ERRbadfid == |
1da177e4 | 458 | le16_to_cpu(pSMB->hdr.Status.DosError.Error)) { |
4b18f2a9 | 459 | return true; |
1da177e4 | 460 | } else { |
4b18f2a9 | 461 | return false; /* on valid oplock brk we get "request" */ |
1da177e4 LT |
462 | } |
463 | } | |
790fe579 | 464 | if (pSMB->hdr.WordCount != 8) |
4b18f2a9 | 465 | return false; |
1da177e4 | 466 | |
59b04c5d | 467 | cifs_dbg(FYI, "oplock type 0x%x level 0x%x\n", |
b6b38f70 | 468 | pSMB->LockType, pSMB->OplockLevel); |
790fe579 | 469 | if (!(pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE)) |
4b18f2a9 | 470 | return false; |
1da177e4 LT |
471 | |
472 | /* look up tcon based on tid & uid */ | |
3f9bcca7 | 473 | spin_lock(&cifs_tcp_ses_lock); |
f1987b44 | 474 | list_for_each(tmp, &srv->smb_ses_list) { |
96daf2b0 | 475 | ses = list_entry(tmp, struct cifs_ses, smb_ses_list); |
f1987b44 | 476 | list_for_each(tmp1, &ses->tcon_list) { |
96daf2b0 | 477 | tcon = list_entry(tmp1, struct cifs_tcon, tcon_list); |
f1987b44 JL |
478 | if (tcon->tid != buf->Tid) |
479 | continue; | |
480 | ||
44c58186 | 481 | cifs_stats_inc(&tcon->stats.cifs_stats.num_oplock_brks); |
3afca265 | 482 | spin_lock(&tcon->open_file_lock); |
f1987b44 JL |
483 | list_for_each(tmp2, &tcon->openFileList) { |
484 | netfile = list_entry(tmp2, struct cifsFileInfo, | |
57337e42 | 485 | tlist); |
4b4de76e | 486 | if (pSMB->Fid != netfile->fid.netfid) |
f1987b44 JL |
487 | continue; |
488 | ||
f96637be | 489 | cifs_dbg(FYI, "file id match, oplock break\n"); |
2b0143b5 | 490 | pCifsInode = CIFS_I(d_inode(netfile->dentry)); |
9b646972 | 491 | |
c11f1df5 SP |
492 | set_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, |
493 | &pCifsInode->flags); | |
494 | ||
9bd45408 PS |
495 | netfile->oplock_epoch = 0; |
496 | netfile->oplock_level = pSMB->OplockLevel; | |
9b646972 | 497 | netfile->oplock_break_cancelled = false; |
9bd45408 | 498 | cifs_queue_oplock_break(netfile); |
9b646972 | 499 | |
3afca265 | 500 | spin_unlock(&tcon->open_file_lock); |
3f9bcca7 | 501 | spin_unlock(&cifs_tcp_ses_lock); |
f1987b44 | 502 | return true; |
1da177e4 | 503 | } |
3afca265 | 504 | spin_unlock(&tcon->open_file_lock); |
3f9bcca7 | 505 | spin_unlock(&cifs_tcp_ses_lock); |
f96637be | 506 | cifs_dbg(FYI, "No matching file for oplock break\n"); |
4b18f2a9 | 507 | return true; |
1da177e4 LT |
508 | } |
509 | } | |
3f9bcca7 | 510 | spin_unlock(&cifs_tcp_ses_lock); |
f96637be | 511 | cifs_dbg(FYI, "Can not process oplock break for non-existent connection\n"); |
4b18f2a9 | 512 | return true; |
1da177e4 LT |
513 | } |
514 | ||
515 | void | |
792af7b0 | 516 | dump_smb(void *buf, int smb_buf_length) |
1da177e4 | 517 | { |
1da177e4 LT |
518 | if (traceSMB == 0) |
519 | return; | |
520 | ||
55d83e0d AS |
521 | print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_NONE, 8, 2, buf, |
522 | smb_buf_length, true); | |
1da177e4 | 523 | } |
6a0b4824 | 524 | |
ec06aedd JL |
525 | void |
526 | cifs_autodisable_serverino(struct cifs_sb_info *cifs_sb) | |
527 | { | |
528 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) { | |
5fc7fcd0 AA |
529 | struct cifs_tcon *tcon = NULL; |
530 | ||
531 | if (cifs_sb->master_tlink) | |
532 | tcon = cifs_sb_master_tcon(cifs_sb); | |
533 | ||
f534dc99 | 534 | cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM; |
29fbeb7a | 535 | cifs_sb->mnt_cifs_serverino_autodisabled = true; |
a0a3036b | 536 | cifs_dbg(VFS, "Autodisabling the use of server inode numbers on %s\n", |
5fc7fcd0 | 537 | tcon ? tcon->treeName : "new server"); |
a0a3036b | 538 | cifs_dbg(VFS, "The server doesn't seem to support them properly or the files might be on different servers (DFS)\n"); |
5fc7fcd0 AA |
539 | cifs_dbg(VFS, "Hardlinks will not be recognized on this mount. Consider mounting with the \"noserverino\" option to silence this message.\n"); |
540 | ||
ec06aedd JL |
541 | } |
542 | } | |
e66673e3 | 543 | |
c6723628 | 544 | void cifs_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock) |
e66673e3 | 545 | { |
c6723628 | 546 | oplock &= 0xF; |
e66673e3 | 547 | |
c6723628 | 548 | if (oplock == OPLOCK_EXCLUSIVE) { |
18cceb6a | 549 | cinode->oplock = CIFS_CACHE_WRITE_FLG | CIFS_CACHE_READ_FLG; |
f96637be JP |
550 | cifs_dbg(FYI, "Exclusive Oplock granted on inode %p\n", |
551 | &cinode->vfs_inode); | |
c6723628 | 552 | } else if (oplock == OPLOCK_READ) { |
18cceb6a | 553 | cinode->oplock = CIFS_CACHE_READ_FLG; |
f96637be JP |
554 | cifs_dbg(FYI, "Level II Oplock granted on inode %p\n", |
555 | &cinode->vfs_inode); | |
18cceb6a PS |
556 | } else |
557 | cinode->oplock = 0; | |
e66673e3 | 558 | } |
3d3ea8e6 | 559 | |
c11f1df5 SP |
560 | /* |
561 | * We wait for oplock breaks to be processed before we attempt to perform | |
562 | * writes. | |
563 | */ | |
564 | int cifs_get_writer(struct cifsInodeInfo *cinode) | |
565 | { | |
566 | int rc; | |
567 | ||
568 | start: | |
569 | rc = wait_on_bit(&cinode->flags, CIFS_INODE_PENDING_OPLOCK_BREAK, | |
74316201 | 570 | TASK_KILLABLE); |
c11f1df5 SP |
571 | if (rc) |
572 | return rc; | |
573 | ||
574 | spin_lock(&cinode->writers_lock); | |
575 | if (!cinode->writers) | |
576 | set_bit(CIFS_INODE_PENDING_WRITERS, &cinode->flags); | |
577 | cinode->writers++; | |
578 | /* Check to see if we have started servicing an oplock break */ | |
579 | if (test_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, &cinode->flags)) { | |
580 | cinode->writers--; | |
581 | if (cinode->writers == 0) { | |
582 | clear_bit(CIFS_INODE_PENDING_WRITERS, &cinode->flags); | |
583 | wake_up_bit(&cinode->flags, CIFS_INODE_PENDING_WRITERS); | |
584 | } | |
585 | spin_unlock(&cinode->writers_lock); | |
586 | goto start; | |
587 | } | |
588 | spin_unlock(&cinode->writers_lock); | |
589 | return 0; | |
590 | } | |
591 | ||
592 | void cifs_put_writer(struct cifsInodeInfo *cinode) | |
593 | { | |
594 | spin_lock(&cinode->writers_lock); | |
595 | cinode->writers--; | |
596 | if (cinode->writers == 0) { | |
597 | clear_bit(CIFS_INODE_PENDING_WRITERS, &cinode->flags); | |
598 | wake_up_bit(&cinode->flags, CIFS_INODE_PENDING_WRITERS); | |
599 | } | |
600 | spin_unlock(&cinode->writers_lock); | |
601 | } | |
602 | ||
b98749ca AA |
603 | /** |
604 | * cifs_queue_oplock_break - queue the oplock break handler for cfile | |
605 | * | |
606 | * This function is called from the demultiplex thread when it | |
607 | * receives an oplock break for @cfile. | |
608 | * | |
609 | * Assumes the tcon->open_file_lock is held. | |
610 | * Assumes cfile->file_info_lock is NOT held. | |
611 | */ | |
612 | void cifs_queue_oplock_break(struct cifsFileInfo *cfile) | |
613 | { | |
614 | /* | |
615 | * Bump the handle refcount now while we hold the | |
616 | * open_file_lock to enforce the validity of it for the oplock | |
617 | * break handler. The matching put is done at the end of the | |
618 | * handler. | |
619 | */ | |
620 | cifsFileInfo_get(cfile); | |
621 | ||
622 | queue_work(cifsoplockd_wq, &cfile->oplock_break); | |
623 | } | |
624 | ||
c11f1df5 SP |
625 | void cifs_done_oplock_break(struct cifsInodeInfo *cinode) |
626 | { | |
627 | clear_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, &cinode->flags); | |
628 | wake_up_bit(&cinode->flags, CIFS_INODE_PENDING_OPLOCK_BREAK); | |
629 | } | |
630 | ||
3d3ea8e6 SP |
631 | bool |
632 | backup_cred(struct cifs_sb_info *cifs_sb) | |
633 | { | |
634 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID) { | |
1f68233c | 635 | if (uid_eq(cifs_sb->mnt_backupuid, current_fsuid())) |
3d3ea8e6 SP |
636 | return true; |
637 | } | |
638 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID) { | |
639 | if (in_group_p(cifs_sb->mnt_backupgid)) | |
640 | return true; | |
641 | } | |
642 | ||
643 | return false; | |
644 | } | |
233839b1 PS |
645 | |
646 | void | |
647 | cifs_del_pending_open(struct cifs_pending_open *open) | |
648 | { | |
3afca265 | 649 | spin_lock(&tlink_tcon(open->tlink)->open_file_lock); |
233839b1 | 650 | list_del(&open->olist); |
3afca265 | 651 | spin_unlock(&tlink_tcon(open->tlink)->open_file_lock); |
233839b1 PS |
652 | } |
653 | ||
654 | void | |
655 | cifs_add_pending_open_locked(struct cifs_fid *fid, struct tcon_link *tlink, | |
656 | struct cifs_pending_open *open) | |
657 | { | |
233839b1 | 658 | memcpy(open->lease_key, fid->lease_key, SMB2_LEASE_KEY_SIZE); |
233839b1 PS |
659 | open->oplock = CIFS_OPLOCK_NO_CHANGE; |
660 | open->tlink = tlink; | |
661 | fid->pending_open = open; | |
662 | list_add_tail(&open->olist, &tlink_tcon(tlink)->pending_opens); | |
663 | } | |
664 | ||
665 | void | |
666 | cifs_add_pending_open(struct cifs_fid *fid, struct tcon_link *tlink, | |
667 | struct cifs_pending_open *open) | |
668 | { | |
3afca265 | 669 | spin_lock(&tlink_tcon(tlink)->open_file_lock); |
233839b1 | 670 | cifs_add_pending_open_locked(fid, tlink, open); |
3afca265 | 671 | spin_unlock(&tlink_tcon(open->tlink)->open_file_lock); |
233839b1 | 672 | } |
4ecce920 AA |
673 | |
674 | /* parses DFS refferal V3 structure | |
675 | * caller is responsible for freeing target_nodes | |
676 | * returns: | |
677 | * - on success - 0 | |
678 | * - on failure - errno | |
679 | */ | |
680 | int | |
681 | parse_dfs_referrals(struct get_dfs_referral_rsp *rsp, u32 rsp_size, | |
682 | unsigned int *num_of_nodes, | |
683 | struct dfs_info3_param **target_nodes, | |
684 | const struct nls_table *nls_codepage, int remap, | |
685 | const char *searchName, bool is_unicode) | |
686 | { | |
687 | int i, rc = 0; | |
688 | char *data_end; | |
689 | struct dfs_referral_level_3 *ref; | |
690 | ||
691 | *num_of_nodes = le16_to_cpu(rsp->NumberOfReferrals); | |
692 | ||
693 | if (*num_of_nodes < 1) { | |
694 | cifs_dbg(VFS, "num_referrals: must be at least > 0, but we get num_referrals = %d\n", | |
695 | *num_of_nodes); | |
696 | rc = -EINVAL; | |
697 | goto parse_DFS_referrals_exit; | |
698 | } | |
699 | ||
700 | ref = (struct dfs_referral_level_3 *) &(rsp->referrals); | |
701 | if (ref->VersionNumber != cpu_to_le16(3)) { | |
702 | cifs_dbg(VFS, "Referrals of V%d version are not supported, should be V3\n", | |
703 | le16_to_cpu(ref->VersionNumber)); | |
704 | rc = -EINVAL; | |
705 | goto parse_DFS_referrals_exit; | |
706 | } | |
707 | ||
708 | /* get the upper boundary of the resp buffer */ | |
709 | data_end = (char *)rsp + rsp_size; | |
710 | ||
711 | cifs_dbg(FYI, "num_referrals: %d dfs flags: 0x%x ...\n", | |
712 | *num_of_nodes, le32_to_cpu(rsp->DFSFlags)); | |
713 | ||
714 | *target_nodes = kcalloc(*num_of_nodes, sizeof(struct dfs_info3_param), | |
715 | GFP_KERNEL); | |
716 | if (*target_nodes == NULL) { | |
717 | rc = -ENOMEM; | |
718 | goto parse_DFS_referrals_exit; | |
719 | } | |
720 | ||
721 | /* collect necessary data from referrals */ | |
722 | for (i = 0; i < *num_of_nodes; i++) { | |
723 | char *temp; | |
724 | int max_len; | |
725 | struct dfs_info3_param *node = (*target_nodes)+i; | |
726 | ||
727 | node->flags = le32_to_cpu(rsp->DFSFlags); | |
728 | if (is_unicode) { | |
729 | __le16 *tmp = kmalloc(strlen(searchName)*2 + 2, | |
730 | GFP_KERNEL); | |
731 | if (tmp == NULL) { | |
732 | rc = -ENOMEM; | |
733 | goto parse_DFS_referrals_exit; | |
734 | } | |
735 | cifsConvertToUTF16((__le16 *) tmp, searchName, | |
736 | PATH_MAX, nls_codepage, remap); | |
737 | node->path_consumed = cifs_utf16_bytes(tmp, | |
738 | le16_to_cpu(rsp->PathConsumed), | |
739 | nls_codepage); | |
740 | kfree(tmp); | |
741 | } else | |
742 | node->path_consumed = le16_to_cpu(rsp->PathConsumed); | |
743 | ||
744 | node->server_type = le16_to_cpu(ref->ServerType); | |
745 | node->ref_flag = le16_to_cpu(ref->ReferralEntryFlags); | |
746 | ||
747 | /* copy DfsPath */ | |
748 | temp = (char *)ref + le16_to_cpu(ref->DfsPathOffset); | |
749 | max_len = data_end - temp; | |
750 | node->path_name = cifs_strndup_from_utf16(temp, max_len, | |
751 | is_unicode, nls_codepage); | |
752 | if (!node->path_name) { | |
753 | rc = -ENOMEM; | |
754 | goto parse_DFS_referrals_exit; | |
755 | } | |
756 | ||
757 | /* copy link target UNC */ | |
758 | temp = (char *)ref + le16_to_cpu(ref->NetworkAddressOffset); | |
759 | max_len = data_end - temp; | |
760 | node->node_name = cifs_strndup_from_utf16(temp, max_len, | |
761 | is_unicode, nls_codepage); | |
762 | if (!node->node_name) { | |
763 | rc = -ENOMEM; | |
764 | goto parse_DFS_referrals_exit; | |
765 | } | |
766 | ||
e7b602f4 PA |
767 | node->ttl = le32_to_cpu(ref->TimeToLive); |
768 | ||
4ecce920 AA |
769 | ref++; |
770 | } | |
771 | ||
772 | parse_DFS_referrals_exit: | |
773 | if (rc) { | |
774 | free_dfs_info_array(*target_nodes, *num_of_nodes); | |
775 | *target_nodes = NULL; | |
776 | *num_of_nodes = 0; | |
777 | } | |
778 | return rc; | |
779 | } | |
ccf7f408 PS |
780 | |
781 | struct cifs_aio_ctx * | |
782 | cifs_aio_ctx_alloc(void) | |
783 | { | |
784 | struct cifs_aio_ctx *ctx; | |
785 | ||
13f5938d JG |
786 | /* |
787 | * Must use kzalloc to initialize ctx->bv to NULL and ctx->direct_io | |
788 | * to false so that we know when we have to unreference pages within | |
789 | * cifs_aio_ctx_release() | |
790 | */ | |
ccf7f408 PS |
791 | ctx = kzalloc(sizeof(struct cifs_aio_ctx), GFP_KERNEL); |
792 | if (!ctx) | |
793 | return NULL; | |
794 | ||
795 | INIT_LIST_HEAD(&ctx->list); | |
796 | mutex_init(&ctx->aio_mutex); | |
797 | init_completion(&ctx->done); | |
798 | kref_init(&ctx->refcount); | |
799 | return ctx; | |
800 | } | |
801 | ||
802 | void | |
803 | cifs_aio_ctx_release(struct kref *refcount) | |
804 | { | |
805 | struct cifs_aio_ctx *ctx = container_of(refcount, | |
806 | struct cifs_aio_ctx, refcount); | |
807 | ||
808 | cifsFileInfo_put(ctx->cfile); | |
13f5938d JG |
809 | |
810 | /* | |
811 | * ctx->bv is only set if setup_aio_ctx_iter() was call successfuly | |
812 | * which means that iov_iter_get_pages() was a success and thus that | |
813 | * we have taken reference on pages. | |
814 | */ | |
815 | if (ctx->bv) { | |
816 | unsigned i; | |
817 | ||
818 | for (i = 0; i < ctx->npages; i++) { | |
819 | if (ctx->should_dirty) | |
820 | set_page_dirty(ctx->bv[i].bv_page); | |
821 | put_page(ctx->bv[i].bv_page); | |
822 | } | |
823 | kvfree(ctx->bv); | |
824 | } | |
825 | ||
ccf7f408 PS |
826 | kfree(ctx); |
827 | } | |
828 | ||
829 | #define CIFS_AIO_KMALLOC_LIMIT (1024 * 1024) | |
830 | ||
831 | int | |
832 | setup_aio_ctx_iter(struct cifs_aio_ctx *ctx, struct iov_iter *iter, int rw) | |
833 | { | |
834 | ssize_t rc; | |
835 | unsigned int cur_npages; | |
836 | unsigned int npages = 0; | |
837 | unsigned int i; | |
838 | size_t len; | |
839 | size_t count = iov_iter_count(iter); | |
840 | unsigned int saved_len; | |
841 | size_t start; | |
842 | unsigned int max_pages = iov_iter_npages(iter, INT_MAX); | |
843 | struct page **pages = NULL; | |
844 | struct bio_vec *bv = NULL; | |
845 | ||
00e23707 | 846 | if (iov_iter_is_kvec(iter)) { |
bf1028a4 | 847 | memcpy(&ctx->iter, iter, sizeof(*iter)); |
ccf7f408 PS |
848 | ctx->len = count; |
849 | iov_iter_advance(iter, count); | |
850 | return 0; | |
851 | } | |
852 | ||
bf1028a4 GS |
853 | if (array_size(max_pages, sizeof(*bv)) <= CIFS_AIO_KMALLOC_LIMIT) |
854 | bv = kmalloc_array(max_pages, sizeof(*bv), GFP_KERNEL); | |
ccf7f408 PS |
855 | |
856 | if (!bv) { | |
bf1028a4 | 857 | bv = vmalloc(array_size(max_pages, sizeof(*bv))); |
ccf7f408 PS |
858 | if (!bv) |
859 | return -ENOMEM; | |
860 | } | |
861 | ||
bf1028a4 GS |
862 | if (array_size(max_pages, sizeof(*pages)) <= CIFS_AIO_KMALLOC_LIMIT) |
863 | pages = kmalloc_array(max_pages, sizeof(*pages), GFP_KERNEL); | |
ccf7f408 PS |
864 | |
865 | if (!pages) { | |
bf1028a4 | 866 | pages = vmalloc(array_size(max_pages, sizeof(*pages))); |
ecf3411a | 867 | if (!pages) { |
ccf7f408 PS |
868 | kvfree(bv); |
869 | return -ENOMEM; | |
870 | } | |
871 | } | |
872 | ||
873 | saved_len = count; | |
874 | ||
875 | while (count && npages < max_pages) { | |
876 | rc = iov_iter_get_pages(iter, pages, count, max_pages, &start); | |
877 | if (rc < 0) { | |
a0a3036b | 878 | cifs_dbg(VFS, "Couldn't get user pages (rc=%zd)\n", rc); |
ccf7f408 PS |
879 | break; |
880 | } | |
881 | ||
882 | if (rc > count) { | |
883 | cifs_dbg(VFS, "get pages rc=%zd more than %zu\n", rc, | |
884 | count); | |
885 | break; | |
886 | } | |
887 | ||
888 | iov_iter_advance(iter, rc); | |
889 | count -= rc; | |
890 | rc += start; | |
891 | cur_npages = DIV_ROUND_UP(rc, PAGE_SIZE); | |
892 | ||
893 | if (npages + cur_npages > max_pages) { | |
894 | cifs_dbg(VFS, "out of vec array capacity (%u vs %u)\n", | |
895 | npages + cur_npages, max_pages); | |
896 | break; | |
897 | } | |
898 | ||
899 | for (i = 0; i < cur_npages; i++) { | |
900 | len = rc > PAGE_SIZE ? PAGE_SIZE : rc; | |
901 | bv[npages + i].bv_page = pages[i]; | |
902 | bv[npages + i].bv_offset = start; | |
903 | bv[npages + i].bv_len = len - start; | |
904 | rc -= len; | |
905 | start = 0; | |
906 | } | |
907 | ||
908 | npages += cur_npages; | |
909 | } | |
910 | ||
911 | kvfree(pages); | |
912 | ctx->bv = bv; | |
913 | ctx->len = saved_len - count; | |
914 | ctx->npages = npages; | |
aa563d7b | 915 | iov_iter_bvec(&ctx->iter, rw, ctx->bv, npages, ctx->len); |
ccf7f408 PS |
916 | return 0; |
917 | } | |
82fb82be AA |
918 | |
919 | /** | |
920 | * cifs_alloc_hash - allocate hash and hash context together | |
921 | * | |
922 | * The caller has to make sure @sdesc is initialized to either NULL or | |
923 | * a valid context. Both can be freed via cifs_free_hash(). | |
924 | */ | |
925 | int | |
926 | cifs_alloc_hash(const char *name, | |
927 | struct crypto_shash **shash, struct sdesc **sdesc) | |
928 | { | |
929 | int rc = 0; | |
930 | size_t size; | |
931 | ||
932 | if (*sdesc != NULL) | |
933 | return 0; | |
934 | ||
935 | *shash = crypto_alloc_shash(name, 0, 0); | |
936 | if (IS_ERR(*shash)) { | |
a0a3036b | 937 | cifs_dbg(VFS, "Could not allocate crypto %s\n", name); |
82fb82be AA |
938 | rc = PTR_ERR(*shash); |
939 | *shash = NULL; | |
940 | *sdesc = NULL; | |
941 | return rc; | |
942 | } | |
943 | ||
944 | size = sizeof(struct shash_desc) + crypto_shash_descsize(*shash); | |
945 | *sdesc = kmalloc(size, GFP_KERNEL); | |
946 | if (*sdesc == NULL) { | |
947 | cifs_dbg(VFS, "no memory left to allocate crypto %s\n", name); | |
948 | crypto_free_shash(*shash); | |
949 | *shash = NULL; | |
950 | return -ENOMEM; | |
951 | } | |
952 | ||
953 | (*sdesc)->shash.tfm = *shash; | |
82fb82be AA |
954 | return 0; |
955 | } | |
956 | ||
957 | /** | |
958 | * cifs_free_hash - free hash and hash context together | |
959 | * | |
960 | * Freeing a NULL hash or context is safe. | |
961 | */ | |
962 | void | |
963 | cifs_free_hash(struct crypto_shash **shash, struct sdesc **sdesc) | |
964 | { | |
965 | kfree(*sdesc); | |
966 | *sdesc = NULL; | |
967 | if (*shash) | |
968 | crypto_free_shash(*shash); | |
969 | *shash = NULL; | |
970 | } | |
7b7f2bdf LL |
971 | |
972 | /** | |
973 | * rqst_page_get_length - obtain the length and offset for a page in smb_rqst | |
974 | * Input: rqst - a smb_rqst, page - a page index for rqst | |
975 | * Output: *len - the length for this page, *offset - the offset for this page | |
976 | */ | |
977 | void rqst_page_get_length(struct smb_rqst *rqst, unsigned int page, | |
978 | unsigned int *len, unsigned int *offset) | |
979 | { | |
980 | *len = rqst->rq_pagesz; | |
981 | *offset = (page == 0) ? rqst->rq_offset : 0; | |
982 | ||
983 | if (rqst->rq_npages == 1 || page == rqst->rq_npages-1) | |
984 | *len = rqst->rq_tailsz; | |
985 | else if (page == 0) | |
986 | *len = rqst->rq_pagesz - rqst->rq_offset; | |
987 | } | |
a3a53b76 PA |
988 | |
989 | void extract_unc_hostname(const char *unc, const char **h, size_t *len) | |
990 | { | |
991 | const char *end; | |
992 | ||
993 | /* skip initial slashes */ | |
994 | while (*unc && (*unc == '\\' || *unc == '/')) | |
995 | unc++; | |
996 | ||
997 | end = unc; | |
998 | ||
999 | while (*end && !(*end == '\\' || *end == '/')) | |
1000 | end++; | |
1001 | ||
1002 | *h = unc; | |
1003 | *len = end - unc; | |
1004 | } | |
340625e6 RS |
1005 | |
1006 | /** | |
1007 | * copy_path_name - copy src path to dst, possibly truncating | |
1008 | * | |
1009 | * returns number of bytes written (including trailing nul) | |
1010 | */ | |
1011 | int copy_path_name(char *dst, const char *src) | |
1012 | { | |
1013 | int name_len; | |
1014 | ||
1015 | /* | |
1016 | * PATH_MAX includes nul, so if strlen(src) >= PATH_MAX it | |
1017 | * will truncate and strlen(dst) will be PATH_MAX-1 | |
1018 | */ | |
1019 | name_len = strscpy(dst, src, PATH_MAX); | |
1020 | if (WARN_ON_ONCE(name_len < 0)) | |
1021 | name_len = PATH_MAX-1; | |
1022 | ||
1023 | /* we count the trailing nul */ | |
1024 | name_len++; | |
1025 | return name_len; | |
1026 | } | |
bacd704a PAS |
1027 | |
1028 | struct super_cb_data { | |
3786f4bd | 1029 | void *data; |
bacd704a PAS |
1030 | struct super_block *sb; |
1031 | }; | |
1032 | ||
3786f4bd | 1033 | static void tcp_super_cb(struct super_block *sb, void *arg) |
bacd704a | 1034 | { |
3786f4bd PA |
1035 | struct super_cb_data *sd = arg; |
1036 | struct TCP_Server_Info *server = sd->data; | |
bacd704a PAS |
1037 | struct cifs_sb_info *cifs_sb; |
1038 | struct cifs_tcon *tcon; | |
1039 | ||
3786f4bd | 1040 | if (sd->sb) |
bacd704a PAS |
1041 | return; |
1042 | ||
1043 | cifs_sb = CIFS_SB(sb); | |
1044 | tcon = cifs_sb_master_tcon(cifs_sb); | |
3786f4bd PA |
1045 | if (tcon->ses->server == server) |
1046 | sd->sb = sb; | |
bacd704a PAS |
1047 | } |
1048 | ||
3786f4bd PA |
1049 | static struct super_block *__cifs_get_super(void (*f)(struct super_block *, void *), |
1050 | void *data) | |
bacd704a | 1051 | { |
3786f4bd PA |
1052 | struct super_cb_data sd = { |
1053 | .data = data, | |
bacd704a PAS |
1054 | .sb = NULL, |
1055 | }; | |
1056 | ||
3786f4bd | 1057 | iterate_supers_type(&cifs_fs_type, f, &sd); |
bacd704a | 1058 | |
3786f4bd PA |
1059 | if (!sd.sb) |
1060 | return ERR_PTR(-EINVAL); | |
bacd704a PAS |
1061 | /* |
1062 | * Grab an active reference in order to prevent automounts (DFS links) | |
1063 | * of expiring and then freeing up our cifs superblock pointer while | |
1064 | * we're doing failover. | |
1065 | */ | |
3786f4bd PA |
1066 | cifs_sb_active(sd.sb); |
1067 | return sd.sb; | |
bacd704a PAS |
1068 | } |
1069 | ||
3786f4bd | 1070 | static void __cifs_put_super(struct super_block *sb) |
bacd704a PAS |
1071 | { |
1072 | if (!IS_ERR_OR_NULL(sb)) | |
1073 | cifs_sb_deactive(sb); | |
1074 | } | |
1075 | ||
3786f4bd PA |
1076 | struct super_block *cifs_get_tcp_super(struct TCP_Server_Info *server) |
1077 | { | |
1078 | return __cifs_get_super(tcp_super_cb, server); | |
1079 | } | |
1080 | ||
1081 | void cifs_put_tcp_super(struct super_block *sb) | |
1082 | { | |
1083 | __cifs_put_super(sb); | |
1084 | } | |
1085 | ||
1086 | #ifdef CONFIG_CIFS_DFS_UPCALL | |
e4af35fa PA |
1087 | int match_target_ip(struct TCP_Server_Info *server, |
1088 | const char *share, size_t share_len, | |
1089 | bool *result) | |
1090 | { | |
1091 | int rc; | |
1092 | char *target, *tip = NULL; | |
1093 | struct sockaddr tipaddr; | |
1094 | ||
1095 | *result = false; | |
1096 | ||
1097 | target = kzalloc(share_len + 3, GFP_KERNEL); | |
1098 | if (!target) { | |
1099 | rc = -ENOMEM; | |
1100 | goto out; | |
1101 | } | |
1102 | ||
1103 | scnprintf(target, share_len + 3, "\\\\%.*s", (int)share_len, share); | |
1104 | ||
1105 | cifs_dbg(FYI, "%s: target name: %s\n", __func__, target + 2); | |
1106 | ||
1107 | rc = dns_resolve_server_name_to_ip(target, &tip); | |
1108 | if (rc < 0) | |
1109 | goto out; | |
1110 | ||
1111 | cifs_dbg(FYI, "%s: target ip: %s\n", __func__, tip); | |
1112 | ||
1113 | if (!cifs_convert_address(&tipaddr, tip, strlen(tip))) { | |
1114 | cifs_dbg(VFS, "%s: failed to convert target ip address\n", | |
1115 | __func__); | |
1116 | rc = -EINVAL; | |
1117 | goto out; | |
1118 | } | |
1119 | ||
1120 | *result = cifs_match_ipaddr((struct sockaddr *)&server->dstaddr, | |
1121 | &tipaddr); | |
1122 | cifs_dbg(FYI, "%s: ip addresses match: %u\n", __func__, *result); | |
1123 | rc = 0; | |
1124 | ||
1125 | out: | |
1126 | kfree(target); | |
1127 | kfree(tip); | |
1128 | ||
1129 | return rc; | |
1130 | } | |
1131 | ||
3786f4bd PA |
1132 | static void tcon_super_cb(struct super_block *sb, void *arg) |
1133 | { | |
1134 | struct super_cb_data *sd = arg; | |
1135 | struct cifs_tcon *tcon = sd->data; | |
1136 | struct cifs_sb_info *cifs_sb; | |
1137 | ||
1138 | if (sd->sb) | |
1139 | return; | |
1140 | ||
1141 | cifs_sb = CIFS_SB(sb); | |
1142 | if (tcon->dfs_path && cifs_sb->origin_fullpath && | |
1143 | !strcasecmp(tcon->dfs_path, cifs_sb->origin_fullpath)) | |
1144 | sd->sb = sb; | |
1145 | } | |
1146 | ||
1147 | static inline struct super_block *cifs_get_tcon_super(struct cifs_tcon *tcon) | |
1148 | { | |
1149 | return __cifs_get_super(tcon_super_cb, tcon); | |
1150 | } | |
1151 | ||
1152 | static inline void cifs_put_tcon_super(struct super_block *sb) | |
1153 | { | |
1154 | __cifs_put_super(sb); | |
1155 | } | |
1156 | #else | |
1157 | static inline struct super_block *cifs_get_tcon_super(struct cifs_tcon *tcon) | |
1158 | { | |
1159 | return ERR_PTR(-EOPNOTSUPP); | |
1160 | } | |
1161 | ||
1162 | static inline void cifs_put_tcon_super(struct super_block *sb) | |
1163 | { | |
1164 | } | |
1165 | #endif | |
1166 | ||
7548e1da | 1167 | int update_super_prepath(struct cifs_tcon *tcon, char *prefix) |
bacd704a PAS |
1168 | { |
1169 | struct super_block *sb; | |
1170 | struct cifs_sb_info *cifs_sb; | |
1171 | int rc = 0; | |
1172 | ||
3786f4bd | 1173 | sb = cifs_get_tcon_super(tcon); |
bacd704a PAS |
1174 | if (IS_ERR(sb)) |
1175 | return PTR_ERR(sb); | |
1176 | ||
1177 | cifs_sb = CIFS_SB(sb); | |
1178 | ||
1179 | kfree(cifs_sb->prepath); | |
1180 | ||
7548e1da PA |
1181 | if (prefix && *prefix) { |
1182 | cifs_sb->prepath = kstrndup(prefix, strlen(prefix), GFP_ATOMIC); | |
bacd704a PAS |
1183 | if (!cifs_sb->prepath) { |
1184 | rc = -ENOMEM; | |
1185 | goto out; | |
1186 | } | |
1187 | ||
1188 | convert_delimiter(cifs_sb->prepath, CIFS_DIR_SEP(cifs_sb)); | |
1189 | } else | |
1190 | cifs_sb->prepath = NULL; | |
1191 | ||
1192 | cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH; | |
1193 | ||
1194 | out: | |
3786f4bd | 1195 | cifs_put_tcon_super(sb); |
bacd704a PAS |
1196 | return rc; |
1197 | } |