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1080ef75 SF |
1 | /* |
2 | * SMB2 version specific operations | |
3 | * | |
4 | * Copyright (c) 2012, Jeff Layton <jlayton@redhat.com> | |
5 | * | |
6 | * This library is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License v2 as published | |
8 | * by the Free Software Foundation. | |
9 | * | |
10 | * This library is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
13 | * the GNU Lesser General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU Lesser General Public License | |
16 | * along with this library; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
18 | */ | |
19 | ||
20 | #include "cifsglob.h" | |
2dc7e1c0 PS |
21 | #include "smb2pdu.h" |
22 | #include "smb2proto.h" | |
28ea5290 PS |
23 | #include "cifsproto.h" |
24 | #include "cifs_debug.h" | |
25 | ||
26 | static int | |
27 | change_conf(struct TCP_Server_Info *server) | |
28 | { | |
29 | server->credits += server->echo_credits + server->oplock_credits; | |
30 | server->oplock_credits = server->echo_credits = 0; | |
31 | switch (server->credits) { | |
32 | case 0: | |
33 | return -1; | |
34 | case 1: | |
35 | server->echoes = false; | |
36 | server->oplocks = false; | |
37 | cERROR(1, "disabling echoes and oplocks"); | |
38 | break; | |
39 | case 2: | |
40 | server->echoes = true; | |
41 | server->oplocks = false; | |
42 | server->echo_credits = 1; | |
43 | cFYI(1, "disabling oplocks"); | |
44 | break; | |
45 | default: | |
46 | server->echoes = true; | |
47 | server->oplocks = true; | |
48 | server->echo_credits = 1; | |
49 | server->oplock_credits = 1; | |
50 | } | |
51 | server->credits -= server->echo_credits + server->oplock_credits; | |
52 | return 0; | |
53 | } | |
54 | ||
55 | static void | |
56 | smb2_add_credits(struct TCP_Server_Info *server, const unsigned int add, | |
57 | const int optype) | |
58 | { | |
59 | int *val, rc = 0; | |
60 | spin_lock(&server->req_lock); | |
61 | val = server->ops->get_credits_field(server, optype); | |
62 | *val += add; | |
63 | server->in_flight--; | |
ec2e4523 | 64 | if (server->in_flight == 0 && (optype & CIFS_OP_MASK) != CIFS_NEG_OP) |
28ea5290 PS |
65 | rc = change_conf(server); |
66 | spin_unlock(&server->req_lock); | |
67 | wake_up(&server->request_q); | |
68 | if (rc) | |
69 | cifs_reconnect(server); | |
70 | } | |
71 | ||
72 | static void | |
73 | smb2_set_credits(struct TCP_Server_Info *server, const int val) | |
74 | { | |
75 | spin_lock(&server->req_lock); | |
76 | server->credits = val; | |
77 | spin_unlock(&server->req_lock); | |
78 | } | |
79 | ||
80 | static int * | |
81 | smb2_get_credits_field(struct TCP_Server_Info *server, const int optype) | |
82 | { | |
83 | switch (optype) { | |
84 | case CIFS_ECHO_OP: | |
85 | return &server->echo_credits; | |
86 | case CIFS_OBREAK_OP: | |
87 | return &server->oplock_credits; | |
88 | default: | |
89 | return &server->credits; | |
90 | } | |
91 | } | |
92 | ||
93 | static unsigned int | |
94 | smb2_get_credits(struct mid_q_entry *mid) | |
95 | { | |
96 | return le16_to_cpu(((struct smb2_hdr *)mid->resp_buf)->CreditRequest); | |
97 | } | |
2dc7e1c0 PS |
98 | |
99 | static __u64 | |
100 | smb2_get_next_mid(struct TCP_Server_Info *server) | |
101 | { | |
102 | __u64 mid; | |
103 | /* for SMB2 we need the current value */ | |
104 | spin_lock(&GlobalMid_Lock); | |
105 | mid = server->CurrentMid++; | |
106 | spin_unlock(&GlobalMid_Lock); | |
107 | return mid; | |
108 | } | |
1080ef75 | 109 | |
093b2bda PS |
110 | static struct mid_q_entry * |
111 | smb2_find_mid(struct TCP_Server_Info *server, char *buf) | |
112 | { | |
113 | struct mid_q_entry *mid; | |
114 | struct smb2_hdr *hdr = (struct smb2_hdr *)buf; | |
115 | ||
116 | spin_lock(&GlobalMid_Lock); | |
117 | list_for_each_entry(mid, &server->pending_mid_q, qhead) { | |
118 | if ((mid->mid == hdr->MessageId) && | |
119 | (mid->mid_state == MID_REQUEST_SUBMITTED) && | |
120 | (mid->command == hdr->Command)) { | |
121 | spin_unlock(&GlobalMid_Lock); | |
122 | return mid; | |
123 | } | |
124 | } | |
125 | spin_unlock(&GlobalMid_Lock); | |
126 | return NULL; | |
127 | } | |
128 | ||
129 | static void | |
130 | smb2_dump_detail(void *buf) | |
131 | { | |
132 | #ifdef CONFIG_CIFS_DEBUG2 | |
133 | struct smb2_hdr *smb = (struct smb2_hdr *)buf; | |
134 | ||
135 | cERROR(1, "Cmd: %d Err: 0x%x Flags: 0x%x Mid: %llu Pid: %d", | |
136 | smb->Command, smb->Status, smb->Flags, smb->MessageId, | |
137 | smb->ProcessId); | |
138 | cERROR(1, "smb buf %p len %u", smb, smb2_calc_size(smb)); | |
139 | #endif | |
140 | } | |
141 | ||
ec2e4523 PS |
142 | static bool |
143 | smb2_need_neg(struct TCP_Server_Info *server) | |
144 | { | |
145 | return server->max_read == 0; | |
146 | } | |
147 | ||
148 | static int | |
149 | smb2_negotiate(const unsigned int xid, struct cifs_ses *ses) | |
150 | { | |
151 | int rc; | |
152 | ses->server->CurrentMid = 0; | |
153 | rc = SMB2_negotiate(xid, ses); | |
154 | /* BB we probably don't need to retry with modern servers */ | |
155 | if (rc == -EAGAIN) | |
156 | rc = -EHOSTDOWN; | |
157 | return rc; | |
158 | } | |
159 | ||
2503a0db PS |
160 | static int |
161 | smb2_is_path_accessible(const unsigned int xid, struct cifs_tcon *tcon, | |
162 | struct cifs_sb_info *cifs_sb, const char *full_path) | |
163 | { | |
164 | int rc; | |
165 | __u64 persistent_fid, volatile_fid; | |
166 | __le16 *utf16_path; | |
167 | ||
168 | utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb); | |
169 | if (!utf16_path) | |
170 | return -ENOMEM; | |
171 | ||
172 | rc = SMB2_open(xid, tcon, utf16_path, &persistent_fid, &volatile_fid, | |
173 | FILE_READ_ATTRIBUTES, FILE_OPEN, 0, 0); | |
174 | if (rc) { | |
175 | kfree(utf16_path); | |
176 | return rc; | |
177 | } | |
178 | ||
179 | rc = SMB2_close(xid, tcon, persistent_fid, volatile_fid); | |
180 | kfree(utf16_path); | |
181 | return rc; | |
182 | } | |
183 | ||
be4cb9e3 PS |
184 | static int |
185 | smb2_get_srv_inum(const unsigned int xid, struct cifs_tcon *tcon, | |
186 | struct cifs_sb_info *cifs_sb, const char *full_path, | |
187 | u64 *uniqueid, FILE_ALL_INFO *data) | |
188 | { | |
189 | *uniqueid = le64_to_cpu(data->IndexNumber); | |
190 | return 0; | |
191 | } | |
192 | ||
25e26632 PS |
193 | static char * |
194 | smb2_build_path_to_root(struct smb_vol *vol, struct cifs_sb_info *cifs_sb, | |
195 | struct cifs_tcon *tcon) | |
196 | { | |
197 | int pplen = vol->prepath ? strlen(vol->prepath) : 0; | |
198 | char *full_path = NULL; | |
199 | ||
200 | /* if no prefix path, simply set path to the root of share to "" */ | |
201 | if (pplen == 0) { | |
202 | full_path = kzalloc(2, GFP_KERNEL); | |
203 | return full_path; | |
204 | } | |
205 | ||
206 | cERROR(1, "prefixpath is not supported for SMB2 now"); | |
207 | return NULL; | |
208 | } | |
209 | ||
9094fad1 PS |
210 | static bool |
211 | smb2_can_echo(struct TCP_Server_Info *server) | |
212 | { | |
213 | return server->echoes; | |
214 | } | |
215 | ||
d60622eb PS |
216 | static void |
217 | smb2_clear_stats(struct cifs_tcon *tcon) | |
218 | { | |
219 | #ifdef CONFIG_CIFS_STATS | |
220 | int i; | |
221 | for (i = 0; i < NUMBER_OF_SMB2_COMMANDS; i++) { | |
222 | atomic_set(&tcon->stats.smb2_stats.smb2_com_sent[i], 0); | |
223 | atomic_set(&tcon->stats.smb2_stats.smb2_com_failed[i], 0); | |
224 | } | |
225 | #endif | |
226 | } | |
227 | ||
228 | static void | |
229 | smb2_print_stats(struct seq_file *m, struct cifs_tcon *tcon) | |
230 | { | |
231 | #ifdef CONFIG_CIFS_STATS | |
232 | atomic_t *sent = tcon->stats.smb2_stats.smb2_com_sent; | |
233 | atomic_t *failed = tcon->stats.smb2_stats.smb2_com_failed; | |
234 | seq_printf(m, "\nNegotiates: %d sent %d failed", | |
235 | atomic_read(&sent[SMB2_NEGOTIATE_HE]), | |
236 | atomic_read(&failed[SMB2_NEGOTIATE_HE])); | |
237 | seq_printf(m, "\nSessionSetups: %d sent %d failed", | |
238 | atomic_read(&sent[SMB2_SESSION_SETUP_HE]), | |
239 | atomic_read(&failed[SMB2_SESSION_SETUP_HE])); | |
240 | #define SMB2LOGOFF 0x0002 /* trivial request/resp */ | |
241 | seq_printf(m, "\nLogoffs: %d sent %d failed", | |
242 | atomic_read(&sent[SMB2_LOGOFF_HE]), | |
243 | atomic_read(&failed[SMB2_LOGOFF_HE])); | |
244 | seq_printf(m, "\nTreeConnects: %d sent %d failed", | |
245 | atomic_read(&sent[SMB2_TREE_CONNECT_HE]), | |
246 | atomic_read(&failed[SMB2_TREE_CONNECT_HE])); | |
247 | seq_printf(m, "\nTreeDisconnects: %d sent %d failed", | |
248 | atomic_read(&sent[SMB2_TREE_DISCONNECT_HE]), | |
249 | atomic_read(&failed[SMB2_TREE_DISCONNECT_HE])); | |
250 | seq_printf(m, "\nCreates: %d sent %d failed", | |
251 | atomic_read(&sent[SMB2_CREATE_HE]), | |
252 | atomic_read(&failed[SMB2_CREATE_HE])); | |
253 | seq_printf(m, "\nCloses: %d sent %d failed", | |
254 | atomic_read(&sent[SMB2_CLOSE_HE]), | |
255 | atomic_read(&failed[SMB2_CLOSE_HE])); | |
256 | seq_printf(m, "\nFlushes: %d sent %d failed", | |
257 | atomic_read(&sent[SMB2_FLUSH_HE]), | |
258 | atomic_read(&failed[SMB2_FLUSH_HE])); | |
259 | seq_printf(m, "\nReads: %d sent %d failed", | |
260 | atomic_read(&sent[SMB2_READ_HE]), | |
261 | atomic_read(&failed[SMB2_READ_HE])); | |
262 | seq_printf(m, "\nWrites: %d sent %d failed", | |
263 | atomic_read(&sent[SMB2_WRITE_HE]), | |
264 | atomic_read(&failed[SMB2_WRITE_HE])); | |
265 | seq_printf(m, "\nLocks: %d sent %d failed", | |
266 | atomic_read(&sent[SMB2_LOCK_HE]), | |
267 | atomic_read(&failed[SMB2_LOCK_HE])); | |
268 | seq_printf(m, "\nIOCTLs: %d sent %d failed", | |
269 | atomic_read(&sent[SMB2_IOCTL_HE]), | |
270 | atomic_read(&failed[SMB2_IOCTL_HE])); | |
271 | seq_printf(m, "\nCancels: %d sent %d failed", | |
272 | atomic_read(&sent[SMB2_CANCEL_HE]), | |
273 | atomic_read(&failed[SMB2_CANCEL_HE])); | |
274 | seq_printf(m, "\nEchos: %d sent %d failed", | |
275 | atomic_read(&sent[SMB2_ECHO_HE]), | |
276 | atomic_read(&failed[SMB2_ECHO_HE])); | |
277 | seq_printf(m, "\nQueryDirectories: %d sent %d failed", | |
278 | atomic_read(&sent[SMB2_QUERY_DIRECTORY_HE]), | |
279 | atomic_read(&failed[SMB2_QUERY_DIRECTORY_HE])); | |
280 | seq_printf(m, "\nChangeNotifies: %d sent %d failed", | |
281 | atomic_read(&sent[SMB2_CHANGE_NOTIFY_HE]), | |
282 | atomic_read(&failed[SMB2_CHANGE_NOTIFY_HE])); | |
283 | seq_printf(m, "\nQueryInfos: %d sent %d failed", | |
284 | atomic_read(&sent[SMB2_QUERY_INFO_HE]), | |
285 | atomic_read(&failed[SMB2_QUERY_INFO_HE])); | |
286 | seq_printf(m, "\nSetInfos: %d sent %d failed", | |
287 | atomic_read(&sent[SMB2_SET_INFO_HE]), | |
288 | atomic_read(&failed[SMB2_SET_INFO_HE])); | |
289 | seq_printf(m, "\nOplockBreaks: %d sent %d failed", | |
290 | atomic_read(&sent[SMB2_OPLOCK_BREAK_HE]), | |
291 | atomic_read(&failed[SMB2_OPLOCK_BREAK_HE])); | |
292 | #endif | |
293 | } | |
294 | ||
1080ef75 | 295 | struct smb_version_operations smb21_operations = { |
2dc7e1c0 | 296 | .setup_request = smb2_setup_request, |
c95b8eed | 297 | .setup_async_request = smb2_setup_async_request, |
2dc7e1c0 | 298 | .check_receive = smb2_check_receive, |
28ea5290 PS |
299 | .add_credits = smb2_add_credits, |
300 | .set_credits = smb2_set_credits, | |
301 | .get_credits_field = smb2_get_credits_field, | |
302 | .get_credits = smb2_get_credits, | |
2dc7e1c0 | 303 | .get_next_mid = smb2_get_next_mid, |
093b2bda PS |
304 | .find_mid = smb2_find_mid, |
305 | .check_message = smb2_check_message, | |
306 | .dump_detail = smb2_dump_detail, | |
d60622eb PS |
307 | .clear_stats = smb2_clear_stats, |
308 | .print_stats = smb2_print_stats, | |
ec2e4523 PS |
309 | .need_neg = smb2_need_neg, |
310 | .negotiate = smb2_negotiate, | |
5478f9ba PS |
311 | .sess_setup = SMB2_sess_setup, |
312 | .logoff = SMB2_logoff, | |
faaf946a PS |
313 | .tree_connect = SMB2_tcon, |
314 | .tree_disconnect = SMB2_tdis, | |
2503a0db | 315 | .is_path_accessible = smb2_is_path_accessible, |
9094fad1 PS |
316 | .can_echo = smb2_can_echo, |
317 | .echo = SMB2_echo, | |
be4cb9e3 PS |
318 | .query_path_info = smb2_query_path_info, |
319 | .get_srv_inum = smb2_get_srv_inum, | |
25e26632 | 320 | .build_path_to_root = smb2_build_path_to_root, |
a0e73183 PS |
321 | .mkdir = smb2_mkdir, |
322 | .mkdir_setinfo = smb2_mkdir_setinfo, | |
1a500f01 | 323 | .rmdir = smb2_rmdir, |
cbe6f439 | 324 | .unlink = smb2_unlink, |
1080ef75 SF |
325 | }; |
326 | ||
327 | struct smb_version_values smb21_values = { | |
328 | .version_string = SMB21_VERSION_STRING, | |
093b2bda PS |
329 | .header_size = sizeof(struct smb2_hdr), |
330 | .max_header_size = MAX_SMB2_HDR_SIZE, | |
2dc7e1c0 | 331 | .lock_cmd = SMB2_LOCK, |
29e20f9c PS |
332 | .cap_unix = 0, |
333 | .cap_nt_find = SMB2_NT_FIND, | |
334 | .cap_large_files = SMB2_LARGE_FILES, | |
1080ef75 | 335 | }; |