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929be906 | 1 | // SPDX-License-Identifier: LGPL-2.1 |
1da177e4 | 2 | /* |
1da177e4 | 3 | * |
ad7a2926 | 4 | * Copyright (C) International Business Machines Corp., 2002,2008 |
1da177e4 LT |
5 | * Author(s): Steve French (sfrench@us.ibm.com) |
6 | * | |
1da177e4 LT |
7 | */ |
8 | ||
9 | #include <linux/slab.h> | |
10 | #include <linux/ctype.h> | |
11 | #include <linux/mempool.h> | |
ccf7f408 | 12 | #include <linux/vmalloc.h> |
1da177e4 LT |
13 | #include "cifspdu.h" |
14 | #include "cifsglob.h" | |
15 | #include "cifsproto.h" | |
16 | #include "cifs_debug.h" | |
17 | #include "smberr.h" | |
18 | #include "nterr.h" | |
6c91d362 | 19 | #include "cifs_unicode.h" |
3792c173 | 20 | #include "smb2pdu.h" |
bacd704a | 21 | #include "cifsfs.h" |
e4af35fa PA |
22 | #ifdef CONFIG_CIFS_DFS_UPCALL |
23 | #include "dns_resolve.h" | |
24 | #endif | |
8401e936 | 25 | #include "fs_context.h" |
a63ec83c | 26 | #include "cached_dir.h" |
1da177e4 LT |
27 | |
28 | extern mempool_t *cifs_sm_req_poolp; | |
29 | extern mempool_t *cifs_req_poolp; | |
1da177e4 | 30 | |
fb8c4b14 SF |
31 | /* The xid serves as a useful identifier for each incoming vfs request, |
32 | in a similar way to the mid which is useful to track each sent smb, | |
33 | and CurrentXid can also provide a running counter (although it | |
34 | will eventually wrap past zero) of the total vfs operations handled | |
1da177e4 LT |
35 | since the cifs fs was mounted */ |
36 | ||
37 | unsigned int | |
6d5786a3 | 38 | _get_xid(void) |
1da177e4 LT |
39 | { |
40 | unsigned int xid; | |
41 | ||
42 | spin_lock(&GlobalMid_Lock); | |
43 | GlobalTotalActiveXid++; | |
50c2f753 SF |
44 | |
45 | /* keep high water mark for number of simultaneous ops in filesystem */ | |
1da177e4 | 46 | if (GlobalTotalActiveXid > GlobalMaxActiveXid) |
50c2f753 | 47 | GlobalMaxActiveXid = GlobalTotalActiveXid; |
790fe579 | 48 | if (GlobalTotalActiveXid > 65000) |
f96637be | 49 | cifs_dbg(FYI, "warning: more than 65000 requests active\n"); |
1da177e4 LT |
50 | xid = GlobalCurrentXid++; |
51 | spin_unlock(&GlobalMid_Lock); | |
52 | return xid; | |
53 | } | |
54 | ||
55 | void | |
6d5786a3 | 56 | _free_xid(unsigned int xid) |
1da177e4 LT |
57 | { |
58 | spin_lock(&GlobalMid_Lock); | |
790fe579 | 59 | /* if (GlobalTotalActiveXid == 0) |
1da177e4 LT |
60 | BUG(); */ |
61 | GlobalTotalActiveXid--; | |
62 | spin_unlock(&GlobalMid_Lock); | |
63 | } | |
64 | ||
96daf2b0 | 65 | struct cifs_ses * |
1da177e4 LT |
66 | sesInfoAlloc(void) |
67 | { | |
96daf2b0 | 68 | struct cifs_ses *ret_buf; |
1da177e4 | 69 | |
96daf2b0 | 70 | ret_buf = kzalloc(sizeof(struct cifs_ses), GFP_KERNEL); |
1da177e4 | 71 | if (ret_buf) { |
1da177e4 | 72 | atomic_inc(&sesInfoAllocCount); |
d7d7a66a | 73 | spin_lock_init(&ret_buf->ses_lock); |
dd3cd870 | 74 | ret_buf->ses_status = SES_NEW; |
14fbf50d JL |
75 | ++ret_buf->ses_count; |
76 | INIT_LIST_HEAD(&ret_buf->smb_ses_list); | |
f1987b44 | 77 | INIT_LIST_HEAD(&ret_buf->tcon_list); |
d7b619cf | 78 | mutex_init(&ret_buf->session_mutex); |
b6f0dd5d | 79 | spin_lock_init(&ret_buf->iface_lock); |
aa45dadd | 80 | INIT_LIST_HEAD(&ret_buf->iface_list); |
724244cd | 81 | spin_lock_init(&ret_buf->chan_lock); |
1da177e4 LT |
82 | } |
83 | return ret_buf; | |
84 | } | |
85 | ||
86 | void | |
96daf2b0 | 87 | sesInfoFree(struct cifs_ses *buf_to_free) |
1da177e4 | 88 | { |
aa45dadd SP |
89 | struct cifs_server_iface *iface = NULL, *niface = NULL; |
90 | ||
1da177e4 | 91 | if (buf_to_free == NULL) { |
f96637be | 92 | cifs_dbg(FYI, "Null buffer passed to sesInfoFree\n"); |
1da177e4 LT |
93 | return; |
94 | } | |
95 | ||
1da177e4 | 96 | atomic_dec(&sesInfoAllocCount); |
f99d49ad JJ |
97 | kfree(buf_to_free->serverOS); |
98 | kfree(buf_to_free->serverDomain); | |
99 | kfree(buf_to_free->serverNOS); | |
453431a5 | 100 | kfree_sensitive(buf_to_free->password); |
8727c8a8 | 101 | kfree(buf_to_free->user_name); |
3979877e | 102 | kfree(buf_to_free->domainName); |
453431a5 | 103 | kfree_sensitive(buf_to_free->auth_key.response); |
aa45dadd SP |
104 | spin_lock(&buf_to_free->iface_lock); |
105 | list_for_each_entry_safe(iface, niface, &buf_to_free->iface_list, | |
106 | iface_head) | |
107 | kref_put(&iface->refcount, release_iface); | |
108 | spin_unlock(&buf_to_free->iface_lock); | |
453431a5 | 109 | kfree_sensitive(buf_to_free); |
1da177e4 LT |
110 | } |
111 | ||
96daf2b0 | 112 | struct cifs_tcon * |
1da177e4 LT |
113 | tconInfoAlloc(void) |
114 | { | |
96daf2b0 | 115 | struct cifs_tcon *ret_buf; |
0544b324 JP |
116 | |
117 | ret_buf = kzalloc(sizeof(*ret_buf), GFP_KERNEL); | |
118 | if (!ret_buf) | |
119 | return NULL; | |
a63ec83c RS |
120 | ret_buf->cfid = init_cached_dir(); |
121 | if (!ret_buf->cfid) { | |
0544b324 JP |
122 | kfree(ret_buf); |
123 | return NULL; | |
1da177e4 | 124 | } |
0544b324 JP |
125 | |
126 | atomic_inc(&tconInfoAllocCount); | |
fdf59eb5 | 127 | ret_buf->status = TID_NEW; |
0544b324 | 128 | ++ret_buf->tc_count; |
d7d7a66a | 129 | spin_lock_init(&ret_buf->tc_lock); |
0544b324 JP |
130 | INIT_LIST_HEAD(&ret_buf->openFileList); |
131 | INIT_LIST_HEAD(&ret_buf->tcon_list); | |
132 | spin_lock_init(&ret_buf->open_file_lock); | |
0544b324 JP |
133 | spin_lock_init(&ret_buf->stat_lock); |
134 | atomic_set(&ret_buf->num_local_opens, 0); | |
135 | atomic_set(&ret_buf->num_remote_opens, 0); | |
136 | ||
1da177e4 LT |
137 | return ret_buf; |
138 | } | |
139 | ||
140 | void | |
a63ec83c | 141 | tconInfoFree(struct cifs_tcon *tcon) |
1da177e4 | 142 | { |
a63ec83c | 143 | if (tcon == NULL) { |
f96637be | 144 | cifs_dbg(FYI, "Null buffer passed to tconInfoFree\n"); |
1da177e4 LT |
145 | return; |
146 | } | |
a63ec83c | 147 | free_cached_dir(tcon); |
1da177e4 | 148 | atomic_dec(&tconInfoAllocCount); |
a63ec83c RS |
149 | kfree(tcon->nativeFileSystem); |
150 | kfree_sensitive(tcon->password); | |
151 | kfree(tcon); | |
1da177e4 LT |
152 | } |
153 | ||
154 | struct smb_hdr * | |
155 | cifs_buf_get(void) | |
156 | { | |
157 | struct smb_hdr *ret_buf = NULL; | |
3792c173 PS |
158 | /* |
159 | * SMB2 header is bigger than CIFS one - no problems to clean some | |
160 | * more bytes for CIFS. | |
161 | */ | |
0d35e382 | 162 | size_t buf_size = sizeof(struct smb2_hdr); |
2a38e120 | 163 | |
3792c173 PS |
164 | /* |
165 | * We could use negotiated size instead of max_msgsize - | |
166 | * but it may be more efficient to always alloc same size | |
167 | * albeit slightly larger than necessary and maxbuffersize | |
168 | * defaults to this and can not be bigger. | |
169 | */ | |
232087cb | 170 | ret_buf = mempool_alloc(cifs_req_poolp, GFP_NOFS); |
1da177e4 LT |
171 | |
172 | /* clear the first few header bytes */ | |
173 | /* for most paths, more is cleared in header_assemble */ | |
a6f74e80 | 174 | memset(ret_buf, 0, buf_size + 3); |
c2c17ddb | 175 | atomic_inc(&buf_alloc_count); |
4498eed5 | 176 | #ifdef CONFIG_CIFS_STATS2 |
c2c17ddb | 177 | atomic_inc(&total_buf_alloc_count); |
4498eed5 | 178 | #endif /* CONFIG_CIFS_STATS2 */ |
1da177e4 LT |
179 | |
180 | return ret_buf; | |
181 | } | |
182 | ||
183 | void | |
184 | cifs_buf_release(void *buf_to_free) | |
185 | { | |
1da177e4 | 186 | if (buf_to_free == NULL) { |
f96637be | 187 | /* cifs_dbg(FYI, "Null buffer passed to cifs_buf_release\n");*/ |
1da177e4 LT |
188 | return; |
189 | } | |
fb8c4b14 | 190 | mempool_free(buf_to_free, cifs_req_poolp); |
1da177e4 | 191 | |
c2c17ddb | 192 | atomic_dec(&buf_alloc_count); |
1da177e4 LT |
193 | return; |
194 | } | |
195 | ||
196 | struct smb_hdr * | |
197 | cifs_small_buf_get(void) | |
198 | { | |
199 | struct smb_hdr *ret_buf = NULL; | |
200 | ||
fb8c4b14 SF |
201 | /* We could use negotiated size instead of max_msgsize - |
202 | but it may be more efficient to always alloc same size | |
203 | albeit slightly larger than necessary and maxbuffersize | |
1da177e4 | 204 | defaults to this and can not be bigger */ |
232087cb | 205 | ret_buf = mempool_alloc(cifs_sm_req_poolp, GFP_NOFS); |
1da177e4 LT |
206 | /* No need to clear memory here, cleared in header assemble */ |
207 | /* memset(ret_buf, 0, sizeof(struct smb_hdr) + 27);*/ | |
c2c17ddb | 208 | atomic_inc(&small_buf_alloc_count); |
4498eed5 | 209 | #ifdef CONFIG_CIFS_STATS2 |
c2c17ddb | 210 | atomic_inc(&total_small_buf_alloc_count); |
4498eed5 SF |
211 | #endif /* CONFIG_CIFS_STATS2 */ |
212 | ||
1da177e4 LT |
213 | return ret_buf; |
214 | } | |
215 | ||
216 | void | |
217 | cifs_small_buf_release(void *buf_to_free) | |
218 | { | |
219 | ||
220 | if (buf_to_free == NULL) { | |
f96637be | 221 | cifs_dbg(FYI, "Null buffer passed to cifs_small_buf_release\n"); |
1da177e4 LT |
222 | return; |
223 | } | |
fb8c4b14 | 224 | mempool_free(buf_to_free, cifs_sm_req_poolp); |
1da177e4 | 225 | |
c2c17ddb | 226 | atomic_dec(&small_buf_alloc_count); |
1da177e4 LT |
227 | return; |
228 | } | |
229 | ||
6d81ed1e SP |
230 | void |
231 | free_rsp_buf(int resp_buftype, void *rsp) | |
232 | { | |
233 | if (resp_buftype == CIFS_SMALL_BUFFER) | |
234 | cifs_small_buf_release(rsp); | |
235 | else if (resp_buftype == CIFS_LARGE_BUFFER) | |
236 | cifs_buf_release(rsp); | |
237 | } | |
238 | ||
1982c344 SF |
239 | /* NB: MID can not be set if treeCon not passed in, in that |
240 | case it is responsbility of caller to set the mid */ | |
1da177e4 LT |
241 | void |
242 | header_assemble(struct smb_hdr *buffer, char smb_command /* command */ , | |
96daf2b0 | 243 | const struct cifs_tcon *treeCon, int word_count |
1da177e4 LT |
244 | /* length of fixed section (word count) in two byte units */) |
245 | { | |
1da177e4 LT |
246 | char *temp = (char *) buffer; |
247 | ||
fb8c4b14 | 248 | memset(temp, 0, 256); /* bigger than MAX_CIFS_HDR_SIZE */ |
1da177e4 | 249 | |
be8e3b00 | 250 | buffer->smb_buf_length = cpu_to_be32( |
630f3f0c | 251 | (2 * word_count) + sizeof(struct smb_hdr) - |
1da177e4 | 252 | 4 /* RFC 1001 length field does not count */ + |
be8e3b00 | 253 | 2 /* for bcc field itself */) ; |
1da177e4 LT |
254 | |
255 | buffer->Protocol[0] = 0xFF; | |
256 | buffer->Protocol[1] = 'S'; | |
257 | buffer->Protocol[2] = 'M'; | |
258 | buffer->Protocol[3] = 'B'; | |
259 | buffer->Command = smb_command; | |
260 | buffer->Flags = 0x00; /* case sensitive */ | |
261 | buffer->Flags2 = SMBFLG2_KNOWS_LONG_NAMES; | |
262 | buffer->Pid = cpu_to_le16((__u16)current->tgid); | |
263 | buffer->PidHigh = cpu_to_le16((__u16)(current->tgid >> 16)); | |
1da177e4 LT |
264 | if (treeCon) { |
265 | buffer->Tid = treeCon->tid; | |
266 | if (treeCon->ses) { | |
267 | if (treeCon->ses->capabilities & CAP_UNICODE) | |
268 | buffer->Flags2 |= SMBFLG2_UNICODE; | |
ad7a2926 | 269 | if (treeCon->ses->capabilities & CAP_STATUS32) |
1da177e4 | 270 | buffer->Flags2 |= SMBFLG2_ERR_STATUS; |
ad7a2926 | 271 | |
1982c344 SF |
272 | /* Uid is not converted */ |
273 | buffer->Uid = treeCon->ses->Suid; | |
1db1aa98 SF |
274 | if (treeCon->ses->server) |
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; |
68ed1449 | 357 | clc_len = smbCalcSize(smb); |
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; |
96daf2b0 SF |
403 | struct cifs_ses *ses; |
404 | struct cifs_tcon *tcon; | |
f1987b44 | 405 | struct cifsInodeInfo *pCifsInode; |
1da177e4 LT |
406 | struct cifsFileInfo *netfile; |
407 | ||
f96637be | 408 | cifs_dbg(FYI, "Checking for oplock break or dnotify response\n"); |
790fe579 | 409 | if ((pSMB->hdr.Command == SMB_COM_NT_TRANSACT) && |
1da177e4 | 410 | (pSMB->hdr.Flags & SMBFLG_RESPONSE)) { |
fb8c4b14 | 411 | struct smb_com_transaction_change_notify_rsp *pSMBr = |
1da177e4 | 412 | (struct smb_com_transaction_change_notify_rsp *)buf; |
fb8c4b14 | 413 | struct file_notify_information *pnotify; |
1da177e4 | 414 | __u32 data_offset = 0; |
097f5863 DC |
415 | size_t len = srv->total_read - sizeof(pSMBr->hdr.smb_buf_length); |
416 | ||
820a803f | 417 | if (get_bcc(buf) > sizeof(struct file_notify_information)) { |
1da177e4 LT |
418 | data_offset = le32_to_cpu(pSMBr->DataOffset); |
419 | ||
097f5863 DC |
420 | if (data_offset > |
421 | len - sizeof(struct file_notify_information)) { | |
a0a3036b | 422 | cifs_dbg(FYI, "Invalid data_offset %u\n", |
097f5863 DC |
423 | data_offset); |
424 | return true; | |
425 | } | |
3979877e SF |
426 | pnotify = (struct file_notify_information *) |
427 | ((char *)&pSMBr->hdr.Protocol + data_offset); | |
f96637be | 428 | cifs_dbg(FYI, "dnotify on %s Action: 0x%x\n", |
b6b38f70 | 429 | pnotify->FileName, pnotify->Action); |
fb8c4b14 | 430 | /* cifs_dump_mem("Rcvd notify Data: ",buf, |
3979877e | 431 | sizeof(struct smb_hdr)+60); */ |
4b18f2a9 | 432 | return true; |
1da177e4 | 433 | } |
790fe579 | 434 | if (pSMBr->hdr.Status.CifsError) { |
59b04c5d | 435 | cifs_dbg(FYI, "notify err 0x%x\n", |
f96637be | 436 | pSMBr->hdr.Status.CifsError); |
4b18f2a9 | 437 | return true; |
1da177e4 | 438 | } |
4b18f2a9 | 439 | return false; |
fb8c4b14 | 440 | } |
790fe579 | 441 | if (pSMB->hdr.Command != SMB_COM_LOCKING_ANDX) |
4b18f2a9 | 442 | return false; |
790fe579 | 443 | if (pSMB->hdr.Flags & SMBFLG_RESPONSE) { |
1da177e4 LT |
444 | /* no sense logging error on invalid handle on oplock |
445 | break - harmless race between close request and oplock | |
446 | break response is expected from time to time writing out | |
447 | large dirty files cached on the client */ | |
fb8c4b14 SF |
448 | if ((NT_STATUS_INVALID_HANDLE) == |
449 | le32_to_cpu(pSMB->hdr.Status.CifsError)) { | |
a0a3036b | 450 | cifs_dbg(FYI, "Invalid handle on oplock break\n"); |
4b18f2a9 | 451 | return true; |
fb8c4b14 | 452 | } else if (ERRbadfid == |
1da177e4 | 453 | le16_to_cpu(pSMB->hdr.Status.DosError.Error)) { |
4b18f2a9 | 454 | return true; |
1da177e4 | 455 | } else { |
4b18f2a9 | 456 | return false; /* on valid oplock brk we get "request" */ |
1da177e4 LT |
457 | } |
458 | } | |
790fe579 | 459 | if (pSMB->hdr.WordCount != 8) |
4b18f2a9 | 460 | return false; |
1da177e4 | 461 | |
59b04c5d | 462 | cifs_dbg(FYI, "oplock type 0x%x level 0x%x\n", |
b6b38f70 | 463 | pSMB->LockType, pSMB->OplockLevel); |
790fe579 | 464 | if (!(pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE)) |
4b18f2a9 | 465 | return false; |
1da177e4 LT |
466 | |
467 | /* look up tcon based on tid & uid */ | |
3f9bcca7 | 468 | spin_lock(&cifs_tcp_ses_lock); |
9543c8ab EM |
469 | list_for_each_entry(ses, &srv->smb_ses_list, smb_ses_list) { |
470 | list_for_each_entry(tcon, &ses->tcon_list, tcon_list) { | |
f1987b44 JL |
471 | if (tcon->tid != buf->Tid) |
472 | continue; | |
473 | ||
44c58186 | 474 | cifs_stats_inc(&tcon->stats.cifs_stats.num_oplock_brks); |
3afca265 | 475 | spin_lock(&tcon->open_file_lock); |
9543c8ab | 476 | list_for_each_entry(netfile, &tcon->openFileList, tlist) { |
4b4de76e | 477 | if (pSMB->Fid != netfile->fid.netfid) |
f1987b44 JL |
478 | continue; |
479 | ||
f96637be | 480 | cifs_dbg(FYI, "file id match, oplock break\n"); |
2b0143b5 | 481 | pCifsInode = CIFS_I(d_inode(netfile->dentry)); |
9b646972 | 482 | |
c11f1df5 SP |
483 | set_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, |
484 | &pCifsInode->flags); | |
485 | ||
9bd45408 PS |
486 | netfile->oplock_epoch = 0; |
487 | netfile->oplock_level = pSMB->OplockLevel; | |
9b646972 | 488 | netfile->oplock_break_cancelled = false; |
9bd45408 | 489 | cifs_queue_oplock_break(netfile); |
9b646972 | 490 | |
3afca265 | 491 | spin_unlock(&tcon->open_file_lock); |
3f9bcca7 | 492 | spin_unlock(&cifs_tcp_ses_lock); |
f1987b44 | 493 | return true; |
1da177e4 | 494 | } |
3afca265 | 495 | spin_unlock(&tcon->open_file_lock); |
3f9bcca7 | 496 | spin_unlock(&cifs_tcp_ses_lock); |
f96637be | 497 | cifs_dbg(FYI, "No matching file for oplock break\n"); |
4b18f2a9 | 498 | return true; |
1da177e4 LT |
499 | } |
500 | } | |
3f9bcca7 | 501 | spin_unlock(&cifs_tcp_ses_lock); |
f96637be | 502 | cifs_dbg(FYI, "Can not process oplock break for non-existent connection\n"); |
4b18f2a9 | 503 | return true; |
1da177e4 LT |
504 | } |
505 | ||
506 | void | |
792af7b0 | 507 | dump_smb(void *buf, int smb_buf_length) |
1da177e4 | 508 | { |
1da177e4 LT |
509 | if (traceSMB == 0) |
510 | return; | |
511 | ||
55d83e0d AS |
512 | print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_NONE, 8, 2, buf, |
513 | smb_buf_length, true); | |
1da177e4 | 514 | } |
6a0b4824 | 515 | |
ec06aedd JL |
516 | void |
517 | cifs_autodisable_serverino(struct cifs_sb_info *cifs_sb) | |
518 | { | |
519 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) { | |
5fc7fcd0 AA |
520 | struct cifs_tcon *tcon = NULL; |
521 | ||
522 | if (cifs_sb->master_tlink) | |
523 | tcon = cifs_sb_master_tcon(cifs_sb); | |
524 | ||
f534dc99 | 525 | cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM; |
29fbeb7a | 526 | cifs_sb->mnt_cifs_serverino_autodisabled = true; |
a0a3036b | 527 | cifs_dbg(VFS, "Autodisabling the use of server inode numbers on %s\n", |
5fc7fcd0 | 528 | tcon ? tcon->treeName : "new server"); |
a0a3036b | 529 | cifs_dbg(VFS, "The server doesn't seem to support them properly or the files might be on different servers (DFS)\n"); |
5fc7fcd0 AA |
530 | cifs_dbg(VFS, "Hardlinks will not be recognized on this mount. Consider mounting with the \"noserverino\" option to silence this message.\n"); |
531 | ||
ec06aedd JL |
532 | } |
533 | } | |
e66673e3 | 534 | |
c6723628 | 535 | void cifs_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock) |
e66673e3 | 536 | { |
c6723628 | 537 | oplock &= 0xF; |
e66673e3 | 538 | |
c6723628 | 539 | if (oplock == OPLOCK_EXCLUSIVE) { |
18cceb6a | 540 | cinode->oplock = CIFS_CACHE_WRITE_FLG | CIFS_CACHE_READ_FLG; |
f96637be | 541 | cifs_dbg(FYI, "Exclusive Oplock granted on inode %p\n", |
874c8ca1 | 542 | &cinode->netfs.inode); |
c6723628 | 543 | } else if (oplock == OPLOCK_READ) { |
18cceb6a | 544 | cinode->oplock = CIFS_CACHE_READ_FLG; |
f96637be | 545 | cifs_dbg(FYI, "Level II Oplock granted on inode %p\n", |
874c8ca1 | 546 | &cinode->netfs.inode); |
18cceb6a PS |
547 | } else |
548 | cinode->oplock = 0; | |
e66673e3 | 549 | } |
3d3ea8e6 | 550 | |
c11f1df5 SP |
551 | /* |
552 | * We wait for oplock breaks to be processed before we attempt to perform | |
553 | * writes. | |
554 | */ | |
555 | int cifs_get_writer(struct cifsInodeInfo *cinode) | |
556 | { | |
557 | int rc; | |
558 | ||
559 | start: | |
560 | rc = wait_on_bit(&cinode->flags, CIFS_INODE_PENDING_OPLOCK_BREAK, | |
74316201 | 561 | TASK_KILLABLE); |
c11f1df5 SP |
562 | if (rc) |
563 | return rc; | |
564 | ||
565 | spin_lock(&cinode->writers_lock); | |
566 | if (!cinode->writers) | |
567 | set_bit(CIFS_INODE_PENDING_WRITERS, &cinode->flags); | |
568 | cinode->writers++; | |
569 | /* Check to see if we have started servicing an oplock break */ | |
570 | if (test_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, &cinode->flags)) { | |
571 | cinode->writers--; | |
572 | if (cinode->writers == 0) { | |
573 | clear_bit(CIFS_INODE_PENDING_WRITERS, &cinode->flags); | |
574 | wake_up_bit(&cinode->flags, CIFS_INODE_PENDING_WRITERS); | |
575 | } | |
576 | spin_unlock(&cinode->writers_lock); | |
577 | goto start; | |
578 | } | |
579 | spin_unlock(&cinode->writers_lock); | |
580 | return 0; | |
581 | } | |
582 | ||
583 | void cifs_put_writer(struct cifsInodeInfo *cinode) | |
584 | { | |
585 | spin_lock(&cinode->writers_lock); | |
586 | cinode->writers--; | |
587 | if (cinode->writers == 0) { | |
588 | clear_bit(CIFS_INODE_PENDING_WRITERS, &cinode->flags); | |
589 | wake_up_bit(&cinode->flags, CIFS_INODE_PENDING_WRITERS); | |
590 | } | |
591 | spin_unlock(&cinode->writers_lock); | |
592 | } | |
593 | ||
b98749ca AA |
594 | /** |
595 | * cifs_queue_oplock_break - queue the oplock break handler for cfile | |
03ab9cb9 | 596 | * @cfile: The file to break the oplock on |
b98749ca AA |
597 | * |
598 | * This function is called from the demultiplex thread when it | |
599 | * receives an oplock break for @cfile. | |
600 | * | |
601 | * Assumes the tcon->open_file_lock is held. | |
602 | * Assumes cfile->file_info_lock is NOT held. | |
603 | */ | |
604 | void cifs_queue_oplock_break(struct cifsFileInfo *cfile) | |
605 | { | |
606 | /* | |
607 | * Bump the handle refcount now while we hold the | |
608 | * open_file_lock to enforce the validity of it for the oplock | |
609 | * break handler. The matching put is done at the end of the | |
610 | * handler. | |
611 | */ | |
612 | cifsFileInfo_get(cfile); | |
613 | ||
614 | queue_work(cifsoplockd_wq, &cfile->oplock_break); | |
615 | } | |
616 | ||
c11f1df5 SP |
617 | void cifs_done_oplock_break(struct cifsInodeInfo *cinode) |
618 | { | |
619 | clear_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, &cinode->flags); | |
620 | wake_up_bit(&cinode->flags, CIFS_INODE_PENDING_OPLOCK_BREAK); | |
621 | } | |
622 | ||
3d3ea8e6 SP |
623 | bool |
624 | backup_cred(struct cifs_sb_info *cifs_sb) | |
625 | { | |
626 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID) { | |
8401e936 | 627 | if (uid_eq(cifs_sb->ctx->backupuid, current_fsuid())) |
3d3ea8e6 SP |
628 | return true; |
629 | } | |
630 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID) { | |
8401e936 | 631 | if (in_group_p(cifs_sb->ctx->backupgid)) |
3d3ea8e6 SP |
632 | return true; |
633 | } | |
634 | ||
635 | return false; | |
636 | } | |
233839b1 PS |
637 | |
638 | void | |
639 | cifs_del_pending_open(struct cifs_pending_open *open) | |
640 | { | |
3afca265 | 641 | spin_lock(&tlink_tcon(open->tlink)->open_file_lock); |
233839b1 | 642 | list_del(&open->olist); |
3afca265 | 643 | spin_unlock(&tlink_tcon(open->tlink)->open_file_lock); |
233839b1 PS |
644 | } |
645 | ||
646 | void | |
647 | cifs_add_pending_open_locked(struct cifs_fid *fid, struct tcon_link *tlink, | |
648 | struct cifs_pending_open *open) | |
649 | { | |
233839b1 | 650 | memcpy(open->lease_key, fid->lease_key, SMB2_LEASE_KEY_SIZE); |
233839b1 PS |
651 | open->oplock = CIFS_OPLOCK_NO_CHANGE; |
652 | open->tlink = tlink; | |
653 | fid->pending_open = open; | |
654 | list_add_tail(&open->olist, &tlink_tcon(tlink)->pending_opens); | |
655 | } | |
656 | ||
657 | void | |
658 | cifs_add_pending_open(struct cifs_fid *fid, struct tcon_link *tlink, | |
659 | struct cifs_pending_open *open) | |
660 | { | |
3afca265 | 661 | spin_lock(&tlink_tcon(tlink)->open_file_lock); |
233839b1 | 662 | cifs_add_pending_open_locked(fid, tlink, open); |
3afca265 | 663 | spin_unlock(&tlink_tcon(open->tlink)->open_file_lock); |
233839b1 | 664 | } |
4ecce920 | 665 | |
860b69a9 RS |
666 | /* |
667 | * Critical section which runs after acquiring deferred_lock. | |
9687c85d RS |
668 | * As there is no reference count on cifs_deferred_close, pdclose |
669 | * should not be used outside deferred_lock. | |
860b69a9 | 670 | */ |
c3f207ab RS |
671 | bool |
672 | cifs_is_deferred_close(struct cifsFileInfo *cfile, struct cifs_deferred_close **pdclose) | |
673 | { | |
674 | struct cifs_deferred_close *dclose; | |
675 | ||
676 | list_for_each_entry(dclose, &CIFS_I(d_inode(cfile->dentry))->deferred_closes, dlist) { | |
677 | if ((dclose->netfid == cfile->fid.netfid) && | |
678 | (dclose->persistent_fid == cfile->fid.persistent_fid) && | |
679 | (dclose->volatile_fid == cfile->fid.volatile_fid)) { | |
680 | *pdclose = dclose; | |
681 | return true; | |
682 | } | |
683 | } | |
684 | return false; | |
685 | } | |
686 | ||
860b69a9 RS |
687 | /* |
688 | * Critical section which runs after acquiring deferred_lock. | |
689 | */ | |
c3f207ab RS |
690 | void |
691 | cifs_add_deferred_close(struct cifsFileInfo *cfile, struct cifs_deferred_close *dclose) | |
692 | { | |
693 | bool is_deferred = false; | |
694 | struct cifs_deferred_close *pdclose; | |
695 | ||
696 | is_deferred = cifs_is_deferred_close(cfile, &pdclose); | |
697 | if (is_deferred) { | |
698 | kfree(dclose); | |
699 | return; | |
700 | } | |
701 | ||
702 | dclose->tlink = cfile->tlink; | |
703 | dclose->netfid = cfile->fid.netfid; | |
704 | dclose->persistent_fid = cfile->fid.persistent_fid; | |
705 | dclose->volatile_fid = cfile->fid.volatile_fid; | |
706 | list_add_tail(&dclose->dlist, &CIFS_I(d_inode(cfile->dentry))->deferred_closes); | |
707 | } | |
708 | ||
860b69a9 RS |
709 | /* |
710 | * Critical section which runs after acquiring deferred_lock. | |
711 | */ | |
c3f207ab RS |
712 | void |
713 | cifs_del_deferred_close(struct cifsFileInfo *cfile) | |
714 | { | |
715 | bool is_deferred = false; | |
716 | struct cifs_deferred_close *dclose; | |
717 | ||
718 | is_deferred = cifs_is_deferred_close(cfile, &dclose); | |
719 | if (!is_deferred) | |
720 | return; | |
721 | list_del(&dclose->dlist); | |
722 | kfree(dclose); | |
723 | } | |
724 | ||
725 | void | |
726 | cifs_close_deferred_file(struct cifsInodeInfo *cifs_inode) | |
727 | { | |
728 | struct cifsFileInfo *cfile = NULL; | |
9e992755 RS |
729 | struct file_list *tmp_list, *tmp_next_list; |
730 | struct list_head file_head; | |
41535701 RS |
731 | |
732 | if (cifs_inode == NULL) | |
733 | return; | |
c3f207ab | 734 | |
9e992755 RS |
735 | INIT_LIST_HEAD(&file_head); |
736 | spin_lock(&cifs_inode->open_file_lock); | |
c3f207ab | 737 | list_for_each_entry(cfile, &cifs_inode->openFileList, flist) { |
41535701 | 738 | if (delayed_work_pending(&cfile->deferred)) { |
9e992755 | 739 | if (cancel_delayed_work(&cfile->deferred)) { |
ca08d0ea ZX |
740 | cifs_del_deferred_close(cfile); |
741 | ||
9e992755 RS |
742 | tmp_list = kmalloc(sizeof(struct file_list), GFP_ATOMIC); |
743 | if (tmp_list == NULL) | |
71826b06 | 744 | break; |
9e992755 RS |
745 | tmp_list->cfile = cfile; |
746 | list_add_tail(&tmp_list->list, &file_head); | |
747 | } | |
41535701 | 748 | } |
c3f207ab | 749 | } |
9e992755 RS |
750 | spin_unlock(&cifs_inode->open_file_lock); |
751 | ||
752 | list_for_each_entry_safe(tmp_list, tmp_next_list, &file_head, list) { | |
753 | _cifsFileInfo_put(tmp_list->cfile, true, false); | |
754 | list_del(&tmp_list->list); | |
755 | kfree(tmp_list); | |
756 | } | |
c3f207ab RS |
757 | } |
758 | ||
78c09634 RS |
759 | void |
760 | cifs_close_all_deferred_files(struct cifs_tcon *tcon) | |
761 | { | |
762 | struct cifsFileInfo *cfile; | |
9e992755 RS |
763 | struct file_list *tmp_list, *tmp_next_list; |
764 | struct list_head file_head; | |
78c09634 | 765 | |
9e992755 | 766 | INIT_LIST_HEAD(&file_head); |
78c09634 | 767 | spin_lock(&tcon->open_file_lock); |
9543c8ab | 768 | list_for_each_entry(cfile, &tcon->openFileList, tlist) { |
9687c85d | 769 | if (delayed_work_pending(&cfile->deferred)) { |
9e992755 | 770 | if (cancel_delayed_work(&cfile->deferred)) { |
ca08d0ea ZX |
771 | cifs_del_deferred_close(cfile); |
772 | ||
9e992755 RS |
773 | tmp_list = kmalloc(sizeof(struct file_list), GFP_ATOMIC); |
774 | if (tmp_list == NULL) | |
71826b06 | 775 | break; |
9e992755 RS |
776 | tmp_list->cfile = cfile; |
777 | list_add_tail(&tmp_list->list, &file_head); | |
778 | } | |
9687c85d | 779 | } |
78c09634 RS |
780 | } |
781 | spin_unlock(&tcon->open_file_lock); | |
9e992755 RS |
782 | |
783 | list_for_each_entry_safe(tmp_list, tmp_next_list, &file_head, list) { | |
784 | _cifsFileInfo_put(tmp_list->cfile, true, false); | |
785 | list_del(&tmp_list->list); | |
786 | kfree(tmp_list); | |
787 | } | |
78c09634 | 788 | } |
e3fc0656 RS |
789 | void |
790 | cifs_close_deferred_file_under_dentry(struct cifs_tcon *tcon, const char *path) | |
791 | { | |
792 | struct cifsFileInfo *cfile; | |
e3fc0656 RS |
793 | struct file_list *tmp_list, *tmp_next_list; |
794 | struct list_head file_head; | |
795 | void *page; | |
796 | const char *full_path; | |
797 | ||
798 | INIT_LIST_HEAD(&file_head); | |
799 | page = alloc_dentry_path(); | |
800 | spin_lock(&tcon->open_file_lock); | |
9543c8ab | 801 | list_for_each_entry(cfile, &tcon->openFileList, tlist) { |
e3fc0656 RS |
802 | full_path = build_path_from_dentry(cfile->dentry, page); |
803 | if (strstr(full_path, path)) { | |
804 | if (delayed_work_pending(&cfile->deferred)) { | |
805 | if (cancel_delayed_work(&cfile->deferred)) { | |
ca08d0ea ZX |
806 | cifs_del_deferred_close(cfile); |
807 | ||
e3fc0656 RS |
808 | tmp_list = kmalloc(sizeof(struct file_list), GFP_ATOMIC); |
809 | if (tmp_list == NULL) | |
810 | break; | |
811 | tmp_list->cfile = cfile; | |
812 | list_add_tail(&tmp_list->list, &file_head); | |
813 | } | |
814 | } | |
815 | } | |
816 | } | |
817 | spin_unlock(&tcon->open_file_lock); | |
818 | ||
819 | list_for_each_entry_safe(tmp_list, tmp_next_list, &file_head, list) { | |
820 | _cifsFileInfo_put(tmp_list->cfile, true, false); | |
821 | list_del(&tmp_list->list); | |
822 | kfree(tmp_list); | |
823 | } | |
824 | free_dentry_path(page); | |
825 | } | |
78c09634 | 826 | |
4ecce920 AA |
827 | /* parses DFS refferal V3 structure |
828 | * caller is responsible for freeing target_nodes | |
829 | * returns: | |
830 | * - on success - 0 | |
831 | * - on failure - errno | |
832 | */ | |
833 | int | |
834 | parse_dfs_referrals(struct get_dfs_referral_rsp *rsp, u32 rsp_size, | |
835 | unsigned int *num_of_nodes, | |
836 | struct dfs_info3_param **target_nodes, | |
837 | const struct nls_table *nls_codepage, int remap, | |
838 | const char *searchName, bool is_unicode) | |
839 | { | |
840 | int i, rc = 0; | |
841 | char *data_end; | |
842 | struct dfs_referral_level_3 *ref; | |
843 | ||
844 | *num_of_nodes = le16_to_cpu(rsp->NumberOfReferrals); | |
845 | ||
846 | if (*num_of_nodes < 1) { | |
847 | cifs_dbg(VFS, "num_referrals: must be at least > 0, but we get num_referrals = %d\n", | |
848 | *num_of_nodes); | |
849 | rc = -EINVAL; | |
850 | goto parse_DFS_referrals_exit; | |
851 | } | |
852 | ||
853 | ref = (struct dfs_referral_level_3 *) &(rsp->referrals); | |
854 | if (ref->VersionNumber != cpu_to_le16(3)) { | |
855 | cifs_dbg(VFS, "Referrals of V%d version are not supported, should be V3\n", | |
856 | le16_to_cpu(ref->VersionNumber)); | |
857 | rc = -EINVAL; | |
858 | goto parse_DFS_referrals_exit; | |
859 | } | |
860 | ||
861 | /* get the upper boundary of the resp buffer */ | |
862 | data_end = (char *)rsp + rsp_size; | |
863 | ||
864 | cifs_dbg(FYI, "num_referrals: %d dfs flags: 0x%x ...\n", | |
865 | *num_of_nodes, le32_to_cpu(rsp->DFSFlags)); | |
866 | ||
867 | *target_nodes = kcalloc(*num_of_nodes, sizeof(struct dfs_info3_param), | |
868 | GFP_KERNEL); | |
869 | if (*target_nodes == NULL) { | |
870 | rc = -ENOMEM; | |
871 | goto parse_DFS_referrals_exit; | |
872 | } | |
873 | ||
874 | /* collect necessary data from referrals */ | |
875 | for (i = 0; i < *num_of_nodes; i++) { | |
876 | char *temp; | |
877 | int max_len; | |
878 | struct dfs_info3_param *node = (*target_nodes)+i; | |
879 | ||
880 | node->flags = le32_to_cpu(rsp->DFSFlags); | |
881 | if (is_unicode) { | |
882 | __le16 *tmp = kmalloc(strlen(searchName)*2 + 2, | |
883 | GFP_KERNEL); | |
884 | if (tmp == NULL) { | |
885 | rc = -ENOMEM; | |
886 | goto parse_DFS_referrals_exit; | |
887 | } | |
888 | cifsConvertToUTF16((__le16 *) tmp, searchName, | |
889 | PATH_MAX, nls_codepage, remap); | |
890 | node->path_consumed = cifs_utf16_bytes(tmp, | |
891 | le16_to_cpu(rsp->PathConsumed), | |
892 | nls_codepage); | |
893 | kfree(tmp); | |
894 | } else | |
895 | node->path_consumed = le16_to_cpu(rsp->PathConsumed); | |
896 | ||
897 | node->server_type = le16_to_cpu(ref->ServerType); | |
898 | node->ref_flag = le16_to_cpu(ref->ReferralEntryFlags); | |
899 | ||
900 | /* copy DfsPath */ | |
901 | temp = (char *)ref + le16_to_cpu(ref->DfsPathOffset); | |
902 | max_len = data_end - temp; | |
903 | node->path_name = cifs_strndup_from_utf16(temp, max_len, | |
904 | is_unicode, nls_codepage); | |
905 | if (!node->path_name) { | |
906 | rc = -ENOMEM; | |
907 | goto parse_DFS_referrals_exit; | |
908 | } | |
909 | ||
910 | /* copy link target UNC */ | |
911 | temp = (char *)ref + le16_to_cpu(ref->NetworkAddressOffset); | |
912 | max_len = data_end - temp; | |
913 | node->node_name = cifs_strndup_from_utf16(temp, max_len, | |
914 | is_unicode, nls_codepage); | |
915 | if (!node->node_name) { | |
916 | rc = -ENOMEM; | |
917 | goto parse_DFS_referrals_exit; | |
918 | } | |
919 | ||
e7b602f4 PA |
920 | node->ttl = le32_to_cpu(ref->TimeToLive); |
921 | ||
4ecce920 AA |
922 | ref++; |
923 | } | |
924 | ||
925 | parse_DFS_referrals_exit: | |
926 | if (rc) { | |
927 | free_dfs_info_array(*target_nodes, *num_of_nodes); | |
928 | *target_nodes = NULL; | |
929 | *num_of_nodes = 0; | |
930 | } | |
931 | return rc; | |
932 | } | |
ccf7f408 PS |
933 | |
934 | struct cifs_aio_ctx * | |
935 | cifs_aio_ctx_alloc(void) | |
936 | { | |
937 | struct cifs_aio_ctx *ctx; | |
938 | ||
13f5938d JG |
939 | /* |
940 | * Must use kzalloc to initialize ctx->bv to NULL and ctx->direct_io | |
941 | * to false so that we know when we have to unreference pages within | |
942 | * cifs_aio_ctx_release() | |
943 | */ | |
ccf7f408 PS |
944 | ctx = kzalloc(sizeof(struct cifs_aio_ctx), GFP_KERNEL); |
945 | if (!ctx) | |
946 | return NULL; | |
947 | ||
948 | INIT_LIST_HEAD(&ctx->list); | |
949 | mutex_init(&ctx->aio_mutex); | |
950 | init_completion(&ctx->done); | |
951 | kref_init(&ctx->refcount); | |
952 | return ctx; | |
953 | } | |
954 | ||
955 | void | |
956 | cifs_aio_ctx_release(struct kref *refcount) | |
957 | { | |
958 | struct cifs_aio_ctx *ctx = container_of(refcount, | |
959 | struct cifs_aio_ctx, refcount); | |
960 | ||
961 | cifsFileInfo_put(ctx->cfile); | |
13f5938d JG |
962 | |
963 | /* | |
964 | * ctx->bv is only set if setup_aio_ctx_iter() was call successfuly | |
965 | * which means that iov_iter_get_pages() was a success and thus that | |
966 | * we have taken reference on pages. | |
967 | */ | |
968 | if (ctx->bv) { | |
969 | unsigned i; | |
970 | ||
971 | for (i = 0; i < ctx->npages; i++) { | |
972 | if (ctx->should_dirty) | |
973 | set_page_dirty(ctx->bv[i].bv_page); | |
974 | put_page(ctx->bv[i].bv_page); | |
975 | } | |
976 | kvfree(ctx->bv); | |
977 | } | |
978 | ||
ccf7f408 PS |
979 | kfree(ctx); |
980 | } | |
981 | ||
982 | #define CIFS_AIO_KMALLOC_LIMIT (1024 * 1024) | |
983 | ||
984 | int | |
985 | setup_aio_ctx_iter(struct cifs_aio_ctx *ctx, struct iov_iter *iter, int rw) | |
986 | { | |
987 | ssize_t rc; | |
988 | unsigned int cur_npages; | |
989 | unsigned int npages = 0; | |
990 | unsigned int i; | |
991 | size_t len; | |
992 | size_t count = iov_iter_count(iter); | |
993 | unsigned int saved_len; | |
994 | size_t start; | |
995 | unsigned int max_pages = iov_iter_npages(iter, INT_MAX); | |
996 | struct page **pages = NULL; | |
997 | struct bio_vec *bv = NULL; | |
998 | ||
00e23707 | 999 | if (iov_iter_is_kvec(iter)) { |
bf1028a4 | 1000 | memcpy(&ctx->iter, iter, sizeof(*iter)); |
ccf7f408 PS |
1001 | ctx->len = count; |
1002 | iov_iter_advance(iter, count); | |
1003 | return 0; | |
1004 | } | |
1005 | ||
bf1028a4 GS |
1006 | if (array_size(max_pages, sizeof(*bv)) <= CIFS_AIO_KMALLOC_LIMIT) |
1007 | bv = kmalloc_array(max_pages, sizeof(*bv), GFP_KERNEL); | |
ccf7f408 PS |
1008 | |
1009 | if (!bv) { | |
bf1028a4 | 1010 | bv = vmalloc(array_size(max_pages, sizeof(*bv))); |
ccf7f408 PS |
1011 | if (!bv) |
1012 | return -ENOMEM; | |
1013 | } | |
1014 | ||
bf1028a4 GS |
1015 | if (array_size(max_pages, sizeof(*pages)) <= CIFS_AIO_KMALLOC_LIMIT) |
1016 | pages = kmalloc_array(max_pages, sizeof(*pages), GFP_KERNEL); | |
ccf7f408 PS |
1017 | |
1018 | if (!pages) { | |
bf1028a4 | 1019 | pages = vmalloc(array_size(max_pages, sizeof(*pages))); |
ecf3411a | 1020 | if (!pages) { |
ccf7f408 PS |
1021 | kvfree(bv); |
1022 | return -ENOMEM; | |
1023 | } | |
1024 | } | |
1025 | ||
1026 | saved_len = count; | |
1027 | ||
1028 | while (count && npages < max_pages) { | |
1ef255e2 | 1029 | rc = iov_iter_get_pages2(iter, pages, count, max_pages, &start); |
ccf7f408 | 1030 | if (rc < 0) { |
a0a3036b | 1031 | cifs_dbg(VFS, "Couldn't get user pages (rc=%zd)\n", rc); |
ccf7f408 PS |
1032 | break; |
1033 | } | |
1034 | ||
1035 | if (rc > count) { | |
1036 | cifs_dbg(VFS, "get pages rc=%zd more than %zu\n", rc, | |
1037 | count); | |
1038 | break; | |
1039 | } | |
1040 | ||
ccf7f408 PS |
1041 | count -= rc; |
1042 | rc += start; | |
1043 | cur_npages = DIV_ROUND_UP(rc, PAGE_SIZE); | |
1044 | ||
1045 | if (npages + cur_npages > max_pages) { | |
1046 | cifs_dbg(VFS, "out of vec array capacity (%u vs %u)\n", | |
1047 | npages + cur_npages, max_pages); | |
1048 | break; | |
1049 | } | |
1050 | ||
1051 | for (i = 0; i < cur_npages; i++) { | |
1052 | len = rc > PAGE_SIZE ? PAGE_SIZE : rc; | |
1053 | bv[npages + i].bv_page = pages[i]; | |
1054 | bv[npages + i].bv_offset = start; | |
1055 | bv[npages + i].bv_len = len - start; | |
1056 | rc -= len; | |
1057 | start = 0; | |
1058 | } | |
1059 | ||
1060 | npages += cur_npages; | |
1061 | } | |
1062 | ||
1063 | kvfree(pages); | |
1064 | ctx->bv = bv; | |
1065 | ctx->len = saved_len - count; | |
1066 | ctx->npages = npages; | |
aa563d7b | 1067 | iov_iter_bvec(&ctx->iter, rw, ctx->bv, npages, ctx->len); |
ccf7f408 PS |
1068 | return 0; |
1069 | } | |
82fb82be AA |
1070 | |
1071 | /** | |
1072 | * cifs_alloc_hash - allocate hash and hash context together | |
03ab9cb9 DH |
1073 | * @name: The name of the crypto hash algo |
1074 | * @shash: Where to put the pointer to the hash algo | |
1075 | * @sdesc: Where to put the pointer to the hash descriptor | |
82fb82be AA |
1076 | * |
1077 | * The caller has to make sure @sdesc is initialized to either NULL or | |
1078 | * a valid context. Both can be freed via cifs_free_hash(). | |
1079 | */ | |
1080 | int | |
1081 | cifs_alloc_hash(const char *name, | |
1082 | struct crypto_shash **shash, struct sdesc **sdesc) | |
1083 | { | |
1084 | int rc = 0; | |
1085 | size_t size; | |
1086 | ||
1087 | if (*sdesc != NULL) | |
1088 | return 0; | |
1089 | ||
1090 | *shash = crypto_alloc_shash(name, 0, 0); | |
1091 | if (IS_ERR(*shash)) { | |
a0a3036b | 1092 | cifs_dbg(VFS, "Could not allocate crypto %s\n", name); |
82fb82be AA |
1093 | rc = PTR_ERR(*shash); |
1094 | *shash = NULL; | |
1095 | *sdesc = NULL; | |
1096 | return rc; | |
1097 | } | |
1098 | ||
1099 | size = sizeof(struct shash_desc) + crypto_shash_descsize(*shash); | |
1100 | *sdesc = kmalloc(size, GFP_KERNEL); | |
1101 | if (*sdesc == NULL) { | |
1102 | cifs_dbg(VFS, "no memory left to allocate crypto %s\n", name); | |
1103 | crypto_free_shash(*shash); | |
1104 | *shash = NULL; | |
1105 | return -ENOMEM; | |
1106 | } | |
1107 | ||
1108 | (*sdesc)->shash.tfm = *shash; | |
82fb82be AA |
1109 | return 0; |
1110 | } | |
1111 | ||
1112 | /** | |
1113 | * cifs_free_hash - free hash and hash context together | |
03ab9cb9 DH |
1114 | * @shash: Where to find the pointer to the hash algo |
1115 | * @sdesc: Where to find the pointer to the hash descriptor | |
82fb82be AA |
1116 | * |
1117 | * Freeing a NULL hash or context is safe. | |
1118 | */ | |
1119 | void | |
1120 | cifs_free_hash(struct crypto_shash **shash, struct sdesc **sdesc) | |
1121 | { | |
1122 | kfree(*sdesc); | |
1123 | *sdesc = NULL; | |
1124 | if (*shash) | |
1125 | crypto_free_shash(*shash); | |
1126 | *shash = NULL; | |
1127 | } | |
7b7f2bdf LL |
1128 | |
1129 | /** | |
1130 | * rqst_page_get_length - obtain the length and offset for a page in smb_rqst | |
03ab9cb9 DH |
1131 | * @rqst: The request descriptor |
1132 | * @page: The index of the page to query | |
1133 | * @len: Where to store the length for this page: | |
1134 | * @offset: Where to store the offset for this page | |
7b7f2bdf LL |
1135 | */ |
1136 | void rqst_page_get_length(struct smb_rqst *rqst, unsigned int page, | |
1137 | unsigned int *len, unsigned int *offset) | |
1138 | { | |
1139 | *len = rqst->rq_pagesz; | |
1140 | *offset = (page == 0) ? rqst->rq_offset : 0; | |
1141 | ||
1142 | if (rqst->rq_npages == 1 || page == rqst->rq_npages-1) | |
1143 | *len = rqst->rq_tailsz; | |
1144 | else if (page == 0) | |
1145 | *len = rqst->rq_pagesz - rqst->rq_offset; | |
1146 | } | |
a3a53b76 PA |
1147 | |
1148 | void extract_unc_hostname(const char *unc, const char **h, size_t *len) | |
1149 | { | |
1150 | const char *end; | |
1151 | ||
1152 | /* skip initial slashes */ | |
1153 | while (*unc && (*unc == '\\' || *unc == '/')) | |
1154 | unc++; | |
1155 | ||
1156 | end = unc; | |
1157 | ||
1158 | while (*end && !(*end == '\\' || *end == '/')) | |
1159 | end++; | |
1160 | ||
1161 | *h = unc; | |
1162 | *len = end - unc; | |
1163 | } | |
340625e6 RS |
1164 | |
1165 | /** | |
1166 | * copy_path_name - copy src path to dst, possibly truncating | |
03ab9cb9 DH |
1167 | * @dst: The destination buffer |
1168 | * @src: The source name | |
340625e6 RS |
1169 | * |
1170 | * returns number of bytes written (including trailing nul) | |
1171 | */ | |
1172 | int copy_path_name(char *dst, const char *src) | |
1173 | { | |
1174 | int name_len; | |
1175 | ||
1176 | /* | |
1177 | * PATH_MAX includes nul, so if strlen(src) >= PATH_MAX it | |
1178 | * will truncate and strlen(dst) will be PATH_MAX-1 | |
1179 | */ | |
1180 | name_len = strscpy(dst, src, PATH_MAX); | |
1181 | if (WARN_ON_ONCE(name_len < 0)) | |
1182 | name_len = PATH_MAX-1; | |
1183 | ||
1184 | /* we count the trailing nul */ | |
1185 | name_len++; | |
1186 | return name_len; | |
1187 | } | |
bacd704a PAS |
1188 | |
1189 | struct super_cb_data { | |
3786f4bd | 1190 | void *data; |
bacd704a PAS |
1191 | struct super_block *sb; |
1192 | }; | |
1193 | ||
3786f4bd | 1194 | static void tcp_super_cb(struct super_block *sb, void *arg) |
bacd704a | 1195 | { |
3786f4bd PA |
1196 | struct super_cb_data *sd = arg; |
1197 | struct TCP_Server_Info *server = sd->data; | |
bacd704a PAS |
1198 | struct cifs_sb_info *cifs_sb; |
1199 | struct cifs_tcon *tcon; | |
1200 | ||
3786f4bd | 1201 | if (sd->sb) |
bacd704a PAS |
1202 | return; |
1203 | ||
1204 | cifs_sb = CIFS_SB(sb); | |
1205 | tcon = cifs_sb_master_tcon(cifs_sb); | |
3786f4bd PA |
1206 | if (tcon->ses->server == server) |
1207 | sd->sb = sb; | |
bacd704a PAS |
1208 | } |
1209 | ||
3786f4bd PA |
1210 | static struct super_block *__cifs_get_super(void (*f)(struct super_block *, void *), |
1211 | void *data) | |
bacd704a | 1212 | { |
3786f4bd PA |
1213 | struct super_cb_data sd = { |
1214 | .data = data, | |
bacd704a PAS |
1215 | .sb = NULL, |
1216 | }; | |
c36ee7da PA |
1217 | struct file_system_type **fs_type = (struct file_system_type *[]) { |
1218 | &cifs_fs_type, &smb3_fs_type, NULL, | |
1219 | }; | |
bacd704a | 1220 | |
c36ee7da PA |
1221 | for (; *fs_type; fs_type++) { |
1222 | iterate_supers_type(*fs_type, f, &sd); | |
1223 | if (sd.sb) { | |
1224 | /* | |
1225 | * Grab an active reference in order to prevent automounts (DFS links) | |
1226 | * of expiring and then freeing up our cifs superblock pointer while | |
1227 | * we're doing failover. | |
1228 | */ | |
1229 | cifs_sb_active(sd.sb); | |
1230 | return sd.sb; | |
1231 | } | |
1232 | } | |
1233 | return ERR_PTR(-EINVAL); | |
bacd704a PAS |
1234 | } |
1235 | ||
3786f4bd | 1236 | static void __cifs_put_super(struct super_block *sb) |
bacd704a PAS |
1237 | { |
1238 | if (!IS_ERR_OR_NULL(sb)) | |
1239 | cifs_sb_deactive(sb); | |
1240 | } | |
1241 | ||
3786f4bd PA |
1242 | struct super_block *cifs_get_tcp_super(struct TCP_Server_Info *server) |
1243 | { | |
1244 | return __cifs_get_super(tcp_super_cb, server); | |
1245 | } | |
1246 | ||
1247 | void cifs_put_tcp_super(struct super_block *sb) | |
1248 | { | |
1249 | __cifs_put_super(sb); | |
1250 | } | |
1251 | ||
1252 | #ifdef CONFIG_CIFS_DFS_UPCALL | |
e4af35fa PA |
1253 | int match_target_ip(struct TCP_Server_Info *server, |
1254 | const char *share, size_t share_len, | |
1255 | bool *result) | |
1256 | { | |
1257 | int rc; | |
1258 | char *target, *tip = NULL; | |
1259 | struct sockaddr tipaddr; | |
1260 | ||
1261 | *result = false; | |
1262 | ||
1263 | target = kzalloc(share_len + 3, GFP_KERNEL); | |
1264 | if (!target) { | |
1265 | rc = -ENOMEM; | |
1266 | goto out; | |
1267 | } | |
1268 | ||
1269 | scnprintf(target, share_len + 3, "\\\\%.*s", (int)share_len, share); | |
1270 | ||
1271 | cifs_dbg(FYI, "%s: target name: %s\n", __func__, target + 2); | |
1272 | ||
506c1da4 | 1273 | rc = dns_resolve_server_name_to_ip(target, &tip, NULL); |
e4af35fa PA |
1274 | if (rc < 0) |
1275 | goto out; | |
1276 | ||
1277 | cifs_dbg(FYI, "%s: target ip: %s\n", __func__, tip); | |
1278 | ||
1279 | if (!cifs_convert_address(&tipaddr, tip, strlen(tip))) { | |
1280 | cifs_dbg(VFS, "%s: failed to convert target ip address\n", | |
1281 | __func__); | |
1282 | rc = -EINVAL; | |
1283 | goto out; | |
1284 | } | |
1285 | ||
1286 | *result = cifs_match_ipaddr((struct sockaddr *)&server->dstaddr, | |
1287 | &tipaddr); | |
1288 | cifs_dbg(FYI, "%s: ip addresses match: %u\n", __func__, *result); | |
1289 | rc = 0; | |
1290 | ||
1291 | out: | |
1292 | kfree(target); | |
1293 | kfree(tip); | |
1294 | ||
1295 | return rc; | |
1296 | } | |
1297 | ||
c88f7dcd | 1298 | int cifs_update_super_prepath(struct cifs_sb_info *cifs_sb, char *prefix) |
3786f4bd | 1299 | { |
bacd704a PAS |
1300 | kfree(cifs_sb->prepath); |
1301 | ||
7548e1da | 1302 | if (prefix && *prefix) { |
8d767223 | 1303 | cifs_sb->prepath = kstrdup(prefix, GFP_ATOMIC); |
c88f7dcd PA |
1304 | if (!cifs_sb->prepath) |
1305 | return -ENOMEM; | |
bacd704a PAS |
1306 | |
1307 | convert_delimiter(cifs_sb->prepath, CIFS_DIR_SEP(cifs_sb)); | |
1308 | } else | |
1309 | cifs_sb->prepath = NULL; | |
1310 | ||
1311 | cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH; | |
c88f7dcd | 1312 | return 0; |
bacd704a | 1313 | } |
a2809d0e EK |
1314 | |
1315 | /** cifs_dfs_query_info_nonascii_quirk | |
1316 | * Handle weird Windows SMB server behaviour. It responds with | |
1317 | * STATUS_OBJECT_NAME_INVALID code to SMB2 QUERY_INFO request | |
1318 | * for "\<server>\<dfsname>\<linkpath>" DFS reference, | |
1319 | * where <dfsname> contains non-ASCII unicode symbols. | |
1320 | * | |
337b8b0e | 1321 | * Check such DFS reference. |
a2809d0e EK |
1322 | */ |
1323 | int cifs_dfs_query_info_nonascii_quirk(const unsigned int xid, | |
1324 | struct cifs_tcon *tcon, | |
1325 | struct cifs_sb_info *cifs_sb, | |
1326 | const char *linkpath) | |
1327 | { | |
1328 | char *treename, *dfspath, sep; | |
1329 | int treenamelen, linkpathlen, rc; | |
1330 | ||
1331 | treename = tcon->treeName; | |
1332 | /* MS-DFSC: All paths in REQ_GET_DFS_REFERRAL and RESP_GET_DFS_REFERRAL | |
1333 | * messages MUST be encoded with exactly one leading backslash, not two | |
1334 | * leading backslashes. | |
1335 | */ | |
1336 | sep = CIFS_DIR_SEP(cifs_sb); | |
1337 | if (treename[0] == sep && treename[1] == sep) | |
1338 | treename++; | |
1339 | linkpathlen = strlen(linkpath); | |
1340 | treenamelen = strnlen(treename, MAX_TREE_SIZE + 1); | |
1341 | dfspath = kzalloc(treenamelen + linkpathlen + 1, GFP_KERNEL); | |
1342 | if (!dfspath) | |
1343 | return -ENOMEM; | |
1344 | if (treenamelen) | |
1345 | memcpy(dfspath, treename, treenamelen); | |
1346 | memcpy(dfspath + treenamelen, linkpath, linkpathlen); | |
1347 | rc = dfs_cache_find(xid, tcon->ses, cifs_sb->local_nls, | |
1348 | cifs_remap(cifs_sb), dfspath, NULL, NULL); | |
1349 | if (rc == 0) { | |
1350 | cifs_dbg(FYI, "DFS ref '%s' is found, emulate -EREMOTE\n", | |
1351 | dfspath); | |
1352 | rc = -EREMOTE; | |
a2809d0e EK |
1353 | } else { |
1354 | cifs_dbg(FYI, "%s: dfs_cache_find returned %d\n", __func__, rc); | |
1355 | } | |
1356 | kfree(dfspath); | |
1357 | return rc; | |
1358 | } | |
c88f7dcd | 1359 | #endif |