ceph: Move secret key parsing earlier.
[linux-2.6.git] / net / ceph / ceph_common.c
1
2 #include <linux/ceph/ceph_debug.h>
3 #include <linux/backing-dev.h>
4 #include <linux/ctype.h>
5 #include <linux/fs.h>
6 #include <linux/inet.h>
7 #include <linux/in6.h>
8 #include <linux/module.h>
9 #include <linux/mount.h>
10 #include <linux/parser.h>
11 #include <linux/sched.h>
12 #include <linux/seq_file.h>
13 #include <linux/slab.h>
14 #include <linux/statfs.h>
15 #include <linux/string.h>
16
17
18 #include <linux/ceph/libceph.h>
19 #include <linux/ceph/debugfs.h>
20 #include <linux/ceph/decode.h>
21 #include <linux/ceph/mon_client.h>
22 #include <linux/ceph/auth.h>
23 #include "crypto.h"
24
25
26
27 /*
28  * find filename portion of a path (/foo/bar/baz -> baz)
29  */
30 const char *ceph_file_part(const char *s, int len)
31 {
32         const char *e = s + len;
33
34         while (e != s && *(e-1) != '/')
35                 e--;
36         return e;
37 }
38 EXPORT_SYMBOL(ceph_file_part);
39
40 const char *ceph_msg_type_name(int type)
41 {
42         switch (type) {
43         case CEPH_MSG_SHUTDOWN: return "shutdown";
44         case CEPH_MSG_PING: return "ping";
45         case CEPH_MSG_AUTH: return "auth";
46         case CEPH_MSG_AUTH_REPLY: return "auth_reply";
47         case CEPH_MSG_MON_MAP: return "mon_map";
48         case CEPH_MSG_MON_GET_MAP: return "mon_get_map";
49         case CEPH_MSG_MON_SUBSCRIBE: return "mon_subscribe";
50         case CEPH_MSG_MON_SUBSCRIBE_ACK: return "mon_subscribe_ack";
51         case CEPH_MSG_STATFS: return "statfs";
52         case CEPH_MSG_STATFS_REPLY: return "statfs_reply";
53         case CEPH_MSG_MDS_MAP: return "mds_map";
54         case CEPH_MSG_CLIENT_SESSION: return "client_session";
55         case CEPH_MSG_CLIENT_RECONNECT: return "client_reconnect";
56         case CEPH_MSG_CLIENT_REQUEST: return "client_request";
57         case CEPH_MSG_CLIENT_REQUEST_FORWARD: return "client_request_forward";
58         case CEPH_MSG_CLIENT_REPLY: return "client_reply";
59         case CEPH_MSG_CLIENT_CAPS: return "client_caps";
60         case CEPH_MSG_CLIENT_CAPRELEASE: return "client_cap_release";
61         case CEPH_MSG_CLIENT_SNAP: return "client_snap";
62         case CEPH_MSG_CLIENT_LEASE: return "client_lease";
63         case CEPH_MSG_OSD_MAP: return "osd_map";
64         case CEPH_MSG_OSD_OP: return "osd_op";
65         case CEPH_MSG_OSD_OPREPLY: return "osd_opreply";
66         case CEPH_MSG_WATCH_NOTIFY: return "watch_notify";
67         default: return "unknown";
68         }
69 }
70 EXPORT_SYMBOL(ceph_msg_type_name);
71
72 /*
73  * Initially learn our fsid, or verify an fsid matches.
74  */
75 int ceph_check_fsid(struct ceph_client *client, struct ceph_fsid *fsid)
76 {
77         if (client->have_fsid) {
78                 if (ceph_fsid_compare(&client->fsid, fsid)) {
79                         pr_err("bad fsid, had %pU got %pU",
80                                &client->fsid, fsid);
81                         return -1;
82                 }
83         } else {
84                 pr_info("client%lld fsid %pU\n", ceph_client_id(client), fsid);
85                 memcpy(&client->fsid, fsid, sizeof(*fsid));
86                 ceph_debugfs_client_init(client);
87                 client->have_fsid = true;
88         }
89         return 0;
90 }
91 EXPORT_SYMBOL(ceph_check_fsid);
92
93 static int strcmp_null(const char *s1, const char *s2)
94 {
95         if (!s1 && !s2)
96                 return 0;
97         if (s1 && !s2)
98                 return -1;
99         if (!s1 && s2)
100                 return 1;
101         return strcmp(s1, s2);
102 }
103
104 int ceph_compare_options(struct ceph_options *new_opt,
105                          struct ceph_client *client)
106 {
107         struct ceph_options *opt1 = new_opt;
108         struct ceph_options *opt2 = client->options;
109         int ofs = offsetof(struct ceph_options, mon_addr);
110         int i;
111         int ret;
112
113         ret = memcmp(opt1, opt2, ofs);
114         if (ret)
115                 return ret;
116
117         ret = strcmp_null(opt1->name, opt2->name);
118         if (ret)
119                 return ret;
120
121         if (opt1->key && !opt2->key)
122                 return -1;
123         if (!opt1->key && opt2->key)
124                 return 1;
125         if (opt1->key && opt2->key) {
126                 if (opt1->key->type != opt2->key->type)
127                         return -1;
128                 if (opt1->key->created.tv_sec != opt2->key->created.tv_sec)
129                         return -1;
130                 if (opt1->key->created.tv_nsec != opt2->key->created.tv_nsec)
131                         return -1;
132                 if (opt1->key->len != opt2->key->len)
133                         return -1;
134                 if (opt1->key->key && !opt2->key->key)
135                         return -1;
136                 if (!opt1->key->key && opt2->key->key)
137                         return 1;
138                 if (opt1->key->key && opt2->key->key) {
139                         ret = memcmp(opt1->key->key, opt2->key->key, opt1->key->len);
140                         if (ret)
141                                 return ret;
142                 }
143         }
144
145         /* any matching mon ip implies a match */
146         for (i = 0; i < opt1->num_mon; i++) {
147                 if (ceph_monmap_contains(client->monc.monmap,
148                                  &opt1->mon_addr[i]))
149                         return 0;
150         }
151         return -1;
152 }
153 EXPORT_SYMBOL(ceph_compare_options);
154
155
156 static int parse_fsid(const char *str, struct ceph_fsid *fsid)
157 {
158         int i = 0;
159         char tmp[3];
160         int err = -EINVAL;
161         int d;
162
163         dout("parse_fsid '%s'\n", str);
164         tmp[2] = 0;
165         while (*str && i < 16) {
166                 if (ispunct(*str)) {
167                         str++;
168                         continue;
169                 }
170                 if (!isxdigit(str[0]) || !isxdigit(str[1]))
171                         break;
172                 tmp[0] = str[0];
173                 tmp[1] = str[1];
174                 if (sscanf(tmp, "%x", &d) < 1)
175                         break;
176                 fsid->fsid[i] = d & 0xff;
177                 i++;
178                 str += 2;
179         }
180
181         if (i == 16)
182                 err = 0;
183         dout("parse_fsid ret %d got fsid %pU", err, fsid);
184         return err;
185 }
186
187 /*
188  * ceph options
189  */
190 enum {
191         Opt_osdtimeout,
192         Opt_osdkeepalivetimeout,
193         Opt_mount_timeout,
194         Opt_osd_idle_ttl,
195         Opt_last_int,
196         /* int args above */
197         Opt_fsid,
198         Opt_name,
199         Opt_secret,
200         Opt_ip,
201         Opt_last_string,
202         /* string args above */
203         Opt_noshare,
204         Opt_nocrc,
205 };
206
207 static match_table_t opt_tokens = {
208         {Opt_osdtimeout, "osdtimeout=%d"},
209         {Opt_osdkeepalivetimeout, "osdkeepalive=%d"},
210         {Opt_mount_timeout, "mount_timeout=%d"},
211         {Opt_osd_idle_ttl, "osd_idle_ttl=%d"},
212         /* int args above */
213         {Opt_fsid, "fsid=%s"},
214         {Opt_name, "name=%s"},
215         {Opt_secret, "secret=%s"},
216         {Opt_ip, "ip=%s"},
217         /* string args above */
218         {Opt_noshare, "noshare"},
219         {Opt_nocrc, "nocrc"},
220         {-1, NULL}
221 };
222
223 void ceph_destroy_options(struct ceph_options *opt)
224 {
225         dout("destroy_options %p\n", opt);
226         kfree(opt->name);
227         if (opt->key) {
228                 ceph_crypto_key_destroy(opt->key);
229                 kfree(opt->key);
230         }
231         kfree(opt);
232 }
233 EXPORT_SYMBOL(ceph_destroy_options);
234
235 int ceph_parse_options(struct ceph_options **popt, char *options,
236                        const char *dev_name, const char *dev_name_end,
237                        int (*parse_extra_token)(char *c, void *private),
238                        void *private)
239 {
240         struct ceph_options *opt;
241         const char *c;
242         int err = -ENOMEM;
243         substring_t argstr[MAX_OPT_ARGS];
244
245         opt = kzalloc(sizeof(*opt), GFP_KERNEL);
246         if (!opt)
247                 return err;
248         opt->mon_addr = kcalloc(CEPH_MAX_MON, sizeof(*opt->mon_addr),
249                                 GFP_KERNEL);
250         if (!opt->mon_addr)
251                 goto out;
252
253         dout("parse_options %p options '%s' dev_name '%s'\n", opt, options,
254              dev_name);
255
256         /* start with defaults */
257         opt->flags = CEPH_OPT_DEFAULT;
258         opt->osd_timeout = CEPH_OSD_TIMEOUT_DEFAULT;
259         opt->osd_keepalive_timeout = CEPH_OSD_KEEPALIVE_DEFAULT;
260         opt->mount_timeout = CEPH_MOUNT_TIMEOUT_DEFAULT; /* seconds */
261         opt->osd_idle_ttl = CEPH_OSD_IDLE_TTL_DEFAULT;   /* seconds */
262
263         /* get mon ip(s) */
264         /* ip1[:port1][,ip2[:port2]...] */
265         err = ceph_parse_ips(dev_name, dev_name_end, opt->mon_addr,
266                              CEPH_MAX_MON, &opt->num_mon);
267         if (err < 0)
268                 goto out;
269
270         /* parse mount options */
271         while ((c = strsep(&options, ",")) != NULL) {
272                 int token, intval, ret;
273                 if (!*c)
274                         continue;
275                 err = -EINVAL;
276                 token = match_token((char *)c, opt_tokens, argstr);
277                 if (token < 0 && parse_extra_token) {
278                         /* extra? */
279                         err = parse_extra_token((char *)c, private);
280                         if (err < 0) {
281                                 pr_err("bad option at '%s'\n", c);
282                                 goto out;
283                         }
284                         continue;
285                 }
286                 if (token < Opt_last_int) {
287                         ret = match_int(&argstr[0], &intval);
288                         if (ret < 0) {
289                                 pr_err("bad mount option arg (not int) "
290                                        "at '%s'\n", c);
291                                 continue;
292                         }
293                         dout("got int token %d val %d\n", token, intval);
294                 } else if (token > Opt_last_int && token < Opt_last_string) {
295                         dout("got string token %d val %s\n", token,
296                              argstr[0].from);
297                 } else {
298                         dout("got token %d\n", token);
299                 }
300                 switch (token) {
301                 case Opt_ip:
302                         err = ceph_parse_ips(argstr[0].from,
303                                              argstr[0].to,
304                                              &opt->my_addr,
305                                              1, NULL);
306                         if (err < 0)
307                                 goto out;
308                         opt->flags |= CEPH_OPT_MYIP;
309                         break;
310
311                 case Opt_fsid:
312                         err = parse_fsid(argstr[0].from, &opt->fsid);
313                         if (err == 0)
314                                 opt->flags |= CEPH_OPT_FSID;
315                         break;
316                 case Opt_name:
317                         opt->name = kstrndup(argstr[0].from,
318                                               argstr[0].to-argstr[0].from,
319                                               GFP_KERNEL);
320                         break;
321                 case Opt_secret:
322                         opt->key = kzalloc(sizeof(*opt->key), GFP_KERNEL);
323                         if (!opt->key) {
324                                 err = -ENOMEM;
325                                 goto out;
326                         }
327                         err = ceph_crypto_key_unarmor(opt->key, argstr[0].from);
328                         if (err < 0)
329                                 goto out;
330                         break;
331
332                         /* misc */
333                 case Opt_osdtimeout:
334                         opt->osd_timeout = intval;
335                         break;
336                 case Opt_osdkeepalivetimeout:
337                         opt->osd_keepalive_timeout = intval;
338                         break;
339                 case Opt_osd_idle_ttl:
340                         opt->osd_idle_ttl = intval;
341                         break;
342                 case Opt_mount_timeout:
343                         opt->mount_timeout = intval;
344                         break;
345
346                 case Opt_noshare:
347                         opt->flags |= CEPH_OPT_NOSHARE;
348                         break;
349
350                 case Opt_nocrc:
351                         opt->flags |= CEPH_OPT_NOCRC;
352                         break;
353
354                 default:
355                         BUG_ON(token);
356                 }
357         }
358
359         /* success */
360         *popt = opt;
361         return 0;
362
363 out:
364         ceph_destroy_options(opt);
365         return err;
366 }
367 EXPORT_SYMBOL(ceph_parse_options);
368
369 u64 ceph_client_id(struct ceph_client *client)
370 {
371         return client->monc.auth->global_id;
372 }
373 EXPORT_SYMBOL(ceph_client_id);
374
375 /*
376  * create a fresh client instance
377  */
378 struct ceph_client *ceph_create_client(struct ceph_options *opt, void *private)
379 {
380         struct ceph_client *client;
381         int err = -ENOMEM;
382
383         client = kzalloc(sizeof(*client), GFP_KERNEL);
384         if (client == NULL)
385                 return ERR_PTR(-ENOMEM);
386
387         client->private = private;
388         client->options = opt;
389
390         mutex_init(&client->mount_mutex);
391         init_waitqueue_head(&client->auth_wq);
392         client->auth_err = 0;
393
394         client->extra_mon_dispatch = NULL;
395         client->supported_features = CEPH_FEATURE_SUPPORTED_DEFAULT;
396         client->required_features = CEPH_FEATURE_REQUIRED_DEFAULT;
397
398         client->msgr = NULL;
399
400         /* subsystems */
401         err = ceph_monc_init(&client->monc, client);
402         if (err < 0)
403                 goto fail;
404         err = ceph_osdc_init(&client->osdc, client);
405         if (err < 0)
406                 goto fail_monc;
407
408         return client;
409
410 fail_monc:
411         ceph_monc_stop(&client->monc);
412 fail:
413         kfree(client);
414         return ERR_PTR(err);
415 }
416 EXPORT_SYMBOL(ceph_create_client);
417
418 void ceph_destroy_client(struct ceph_client *client)
419 {
420         dout("destroy_client %p\n", client);
421
422         /* unmount */
423         ceph_osdc_stop(&client->osdc);
424
425         /*
426          * make sure osd connections close out before destroying the
427          * auth module, which is needed to free those connections'
428          * ceph_authorizers.
429          */
430         ceph_msgr_flush();
431
432         ceph_monc_stop(&client->monc);
433
434         ceph_debugfs_client_cleanup(client);
435
436         if (client->msgr)
437                 ceph_messenger_destroy(client->msgr);
438
439         ceph_destroy_options(client->options);
440
441         kfree(client);
442         dout("destroy_client %p done\n", client);
443 }
444 EXPORT_SYMBOL(ceph_destroy_client);
445
446 /*
447  * true if we have the mon map (and have thus joined the cluster)
448  */
449 static int have_mon_and_osd_map(struct ceph_client *client)
450 {
451         return client->monc.monmap && client->monc.monmap->epoch &&
452                client->osdc.osdmap && client->osdc.osdmap->epoch;
453 }
454
455 /*
456  * mount: join the ceph cluster, and open root directory.
457  */
458 int __ceph_open_session(struct ceph_client *client, unsigned long started)
459 {
460         struct ceph_entity_addr *myaddr = NULL;
461         int err;
462         unsigned long timeout = client->options->mount_timeout * HZ;
463
464         /* initialize the messenger */
465         if (client->msgr == NULL) {
466                 if (ceph_test_opt(client, MYIP))
467                         myaddr = &client->options->my_addr;
468                 client->msgr = ceph_messenger_create(myaddr,
469                                         client->supported_features,
470                                         client->required_features);
471                 if (IS_ERR(client->msgr)) {
472                         client->msgr = NULL;
473                         return PTR_ERR(client->msgr);
474                 }
475                 client->msgr->nocrc = ceph_test_opt(client, NOCRC);
476         }
477
478         /* open session, and wait for mon and osd maps */
479         err = ceph_monc_open_session(&client->monc);
480         if (err < 0)
481                 return err;
482
483         while (!have_mon_and_osd_map(client)) {
484                 err = -EIO;
485                 if (timeout && time_after_eq(jiffies, started + timeout))
486                         return err;
487
488                 /* wait */
489                 dout("mount waiting for mon_map\n");
490                 err = wait_event_interruptible_timeout(client->auth_wq,
491                         have_mon_and_osd_map(client) || (client->auth_err < 0),
492                         timeout);
493                 if (err == -EINTR || err == -ERESTARTSYS)
494                         return err;
495                 if (client->auth_err < 0)
496                         return client->auth_err;
497         }
498
499         return 0;
500 }
501 EXPORT_SYMBOL(__ceph_open_session);
502
503
504 int ceph_open_session(struct ceph_client *client)
505 {
506         int ret;
507         unsigned long started = jiffies;  /* note the start time */
508
509         dout("open_session start\n");
510         mutex_lock(&client->mount_mutex);
511
512         ret = __ceph_open_session(client, started);
513
514         mutex_unlock(&client->mount_mutex);
515         return ret;
516 }
517 EXPORT_SYMBOL(ceph_open_session);
518
519
520 static int __init init_ceph_lib(void)
521 {
522         int ret = 0;
523
524         ret = ceph_debugfs_init();
525         if (ret < 0)
526                 goto out;
527
528         ret = ceph_msgr_init();
529         if (ret < 0)
530                 goto out_debugfs;
531
532         pr_info("loaded (mon/osd proto %d/%d, osdmap %d/%d %d/%d)\n",
533                 CEPH_MONC_PROTOCOL, CEPH_OSDC_PROTOCOL,
534                 CEPH_OSDMAP_VERSION, CEPH_OSDMAP_VERSION_EXT,
535                 CEPH_OSDMAP_INC_VERSION, CEPH_OSDMAP_INC_VERSION_EXT);
536
537         return 0;
538
539 out_debugfs:
540         ceph_debugfs_cleanup();
541 out:
542         return ret;
543 }
544
545 static void __exit exit_ceph_lib(void)
546 {
547         dout("exit_ceph_lib\n");
548         ceph_msgr_exit();
549         ceph_debugfs_cleanup();
550 }
551
552 module_init(init_ceph_lib);
553 module_exit(exit_ceph_lib);
554
555 MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
556 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
557 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
558 MODULE_DESCRIPTION("Ceph filesystem for Linux");
559 MODULE_LICENSE("GPL");