Merge branch 'CVE-2014-7970' of git://git.kernel.org/pub/scm/linux/kernel/git/luto...
[sfrench/cifs-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/key.h>
9 #include <keys/ceph-type.h>
10 #include <linux/module.h>
11 #include <linux/mount.h>
12 #include <linux/parser.h>
13 #include <linux/sched.h>
14 #include <linux/seq_file.h>
15 #include <linux/slab.h>
16 #include <linux/statfs.h>
17 #include <linux/string.h>
18 #include <linux/vmalloc.h>
19 #include <linux/nsproxy.h>
20 #include <net/net_namespace.h>
21
22
23 #include <linux/ceph/ceph_features.h>
24 #include <linux/ceph/libceph.h>
25 #include <linux/ceph/debugfs.h>
26 #include <linux/ceph/decode.h>
27 #include <linux/ceph/mon_client.h>
28 #include <linux/ceph/auth.h>
29 #include "crypto.h"
30
31
32 /*
33  * Module compatibility interface.  For now it doesn't do anything,
34  * but its existence signals a certain level of functionality.
35  *
36  * The data buffer is used to pass information both to and from
37  * libceph.  The return value indicates whether libceph determines
38  * it is compatible with the caller (from another kernel module),
39  * given the provided data.
40  *
41  * The data pointer can be null.
42  */
43 bool libceph_compatible(void *data)
44 {
45         return true;
46 }
47 EXPORT_SYMBOL(libceph_compatible);
48
49 /*
50  * find filename portion of a path (/foo/bar/baz -> baz)
51  */
52 const char *ceph_file_part(const char *s, int len)
53 {
54         const char *e = s + len;
55
56         while (e != s && *(e-1) != '/')
57                 e--;
58         return e;
59 }
60 EXPORT_SYMBOL(ceph_file_part);
61
62 const char *ceph_msg_type_name(int type)
63 {
64         switch (type) {
65         case CEPH_MSG_SHUTDOWN: return "shutdown";
66         case CEPH_MSG_PING: return "ping";
67         case CEPH_MSG_AUTH: return "auth";
68         case CEPH_MSG_AUTH_REPLY: return "auth_reply";
69         case CEPH_MSG_MON_MAP: return "mon_map";
70         case CEPH_MSG_MON_GET_MAP: return "mon_get_map";
71         case CEPH_MSG_MON_SUBSCRIBE: return "mon_subscribe";
72         case CEPH_MSG_MON_SUBSCRIBE_ACK: return "mon_subscribe_ack";
73         case CEPH_MSG_STATFS: return "statfs";
74         case CEPH_MSG_STATFS_REPLY: return "statfs_reply";
75         case CEPH_MSG_MON_GET_VERSION: return "mon_get_version";
76         case CEPH_MSG_MON_GET_VERSION_REPLY: return "mon_get_version_reply";
77         case CEPH_MSG_MDS_MAP: return "mds_map";
78         case CEPH_MSG_CLIENT_SESSION: return "client_session";
79         case CEPH_MSG_CLIENT_RECONNECT: return "client_reconnect";
80         case CEPH_MSG_CLIENT_REQUEST: return "client_request";
81         case CEPH_MSG_CLIENT_REQUEST_FORWARD: return "client_request_forward";
82         case CEPH_MSG_CLIENT_REPLY: return "client_reply";
83         case CEPH_MSG_CLIENT_CAPS: return "client_caps";
84         case CEPH_MSG_CLIENT_CAPRELEASE: return "client_cap_release";
85         case CEPH_MSG_CLIENT_SNAP: return "client_snap";
86         case CEPH_MSG_CLIENT_LEASE: return "client_lease";
87         case CEPH_MSG_OSD_MAP: return "osd_map";
88         case CEPH_MSG_OSD_OP: return "osd_op";
89         case CEPH_MSG_OSD_OPREPLY: return "osd_opreply";
90         case CEPH_MSG_WATCH_NOTIFY: return "watch_notify";
91         default: return "unknown";
92         }
93 }
94 EXPORT_SYMBOL(ceph_msg_type_name);
95
96 /*
97  * Initially learn our fsid, or verify an fsid matches.
98  */
99 int ceph_check_fsid(struct ceph_client *client, struct ceph_fsid *fsid)
100 {
101         if (client->have_fsid) {
102                 if (ceph_fsid_compare(&client->fsid, fsid)) {
103                         pr_err("bad fsid, had %pU got %pU",
104                                &client->fsid, fsid);
105                         return -1;
106                 }
107         } else {
108                 memcpy(&client->fsid, fsid, sizeof(*fsid));
109         }
110         return 0;
111 }
112 EXPORT_SYMBOL(ceph_check_fsid);
113
114 static int strcmp_null(const char *s1, const char *s2)
115 {
116         if (!s1 && !s2)
117                 return 0;
118         if (s1 && !s2)
119                 return -1;
120         if (!s1 && s2)
121                 return 1;
122         return strcmp(s1, s2);
123 }
124
125 int ceph_compare_options(struct ceph_options *new_opt,
126                          struct ceph_client *client)
127 {
128         struct ceph_options *opt1 = new_opt;
129         struct ceph_options *opt2 = client->options;
130         int ofs = offsetof(struct ceph_options, mon_addr);
131         int i;
132         int ret;
133
134         ret = memcmp(opt1, opt2, ofs);
135         if (ret)
136                 return ret;
137
138         ret = strcmp_null(opt1->name, opt2->name);
139         if (ret)
140                 return ret;
141
142         if (opt1->key && !opt2->key)
143                 return -1;
144         if (!opt1->key && opt2->key)
145                 return 1;
146         if (opt1->key && opt2->key) {
147                 if (opt1->key->type != opt2->key->type)
148                         return -1;
149                 if (opt1->key->created.tv_sec != opt2->key->created.tv_sec)
150                         return -1;
151                 if (opt1->key->created.tv_nsec != opt2->key->created.tv_nsec)
152                         return -1;
153                 if (opt1->key->len != opt2->key->len)
154                         return -1;
155                 if (opt1->key->key && !opt2->key->key)
156                         return -1;
157                 if (!opt1->key->key && opt2->key->key)
158                         return 1;
159                 if (opt1->key->key && opt2->key->key) {
160                         ret = memcmp(opt1->key->key, opt2->key->key, opt1->key->len);
161                         if (ret)
162                                 return ret;
163                 }
164         }
165
166         /* any matching mon ip implies a match */
167         for (i = 0; i < opt1->num_mon; i++) {
168                 if (ceph_monmap_contains(client->monc.monmap,
169                                  &opt1->mon_addr[i]))
170                         return 0;
171         }
172         return -1;
173 }
174 EXPORT_SYMBOL(ceph_compare_options);
175
176 void *ceph_kvmalloc(size_t size, gfp_t flags)
177 {
178         if (size <= (PAGE_SIZE << PAGE_ALLOC_COSTLY_ORDER)) {
179                 void *ptr = kmalloc(size, flags | __GFP_NOWARN);
180                 if (ptr)
181                         return ptr;
182         }
183
184         return __vmalloc(size, flags | __GFP_HIGHMEM, PAGE_KERNEL);
185 }
186
187 void ceph_kvfree(const void *ptr)
188 {
189         if (is_vmalloc_addr(ptr))
190                 vfree(ptr);
191         else
192                 kfree(ptr);
193 }
194
195
196 static int parse_fsid(const char *str, struct ceph_fsid *fsid)
197 {
198         int i = 0;
199         char tmp[3];
200         int err = -EINVAL;
201         int d;
202
203         dout("parse_fsid '%s'\n", str);
204         tmp[2] = 0;
205         while (*str && i < 16) {
206                 if (ispunct(*str)) {
207                         str++;
208                         continue;
209                 }
210                 if (!isxdigit(str[0]) || !isxdigit(str[1]))
211                         break;
212                 tmp[0] = str[0];
213                 tmp[1] = str[1];
214                 if (sscanf(tmp, "%x", &d) < 1)
215                         break;
216                 fsid->fsid[i] = d & 0xff;
217                 i++;
218                 str += 2;
219         }
220
221         if (i == 16)
222                 err = 0;
223         dout("parse_fsid ret %d got fsid %pU", err, fsid);
224         return err;
225 }
226
227 /*
228  * ceph options
229  */
230 enum {
231         Opt_osdtimeout,
232         Opt_osdkeepalivetimeout,
233         Opt_mount_timeout,
234         Opt_osd_idle_ttl,
235         Opt_last_int,
236         /* int args above */
237         Opt_fsid,
238         Opt_name,
239         Opt_secret,
240         Opt_key,
241         Opt_ip,
242         Opt_last_string,
243         /* string args above */
244         Opt_share,
245         Opt_noshare,
246         Opt_crc,
247         Opt_nocrc,
248 };
249
250 static match_table_t opt_tokens = {
251         {Opt_osdtimeout, "osdtimeout=%d"},
252         {Opt_osdkeepalivetimeout, "osdkeepalive=%d"},
253         {Opt_mount_timeout, "mount_timeout=%d"},
254         {Opt_osd_idle_ttl, "osd_idle_ttl=%d"},
255         /* int args above */
256         {Opt_fsid, "fsid=%s"},
257         {Opt_name, "name=%s"},
258         {Opt_secret, "secret=%s"},
259         {Opt_key, "key=%s"},
260         {Opt_ip, "ip=%s"},
261         /* string args above */
262         {Opt_share, "share"},
263         {Opt_noshare, "noshare"},
264         {Opt_crc, "crc"},
265         {Opt_nocrc, "nocrc"},
266         {-1, NULL}
267 };
268
269 void ceph_destroy_options(struct ceph_options *opt)
270 {
271         dout("destroy_options %p\n", opt);
272         kfree(opt->name);
273         if (opt->key) {
274                 ceph_crypto_key_destroy(opt->key);
275                 kfree(opt->key);
276         }
277         kfree(opt->mon_addr);
278         kfree(opt);
279 }
280 EXPORT_SYMBOL(ceph_destroy_options);
281
282 /* get secret from key store */
283 static int get_secret(struct ceph_crypto_key *dst, const char *name) {
284         struct key *ukey;
285         int key_err;
286         int err = 0;
287         struct ceph_crypto_key *ckey;
288
289         ukey = request_key(&key_type_ceph, name, NULL);
290         if (!ukey || IS_ERR(ukey)) {
291                 /* request_key errors don't map nicely to mount(2)
292                    errors; don't even try, but still printk */
293                 key_err = PTR_ERR(ukey);
294                 switch (key_err) {
295                 case -ENOKEY:
296                         pr_warning("ceph: Mount failed due to key not found: %s\n", name);
297                         break;
298                 case -EKEYEXPIRED:
299                         pr_warning("ceph: Mount failed due to expired key: %s\n", name);
300                         break;
301                 case -EKEYREVOKED:
302                         pr_warning("ceph: Mount failed due to revoked key: %s\n", name);
303                         break;
304                 default:
305                         pr_warning("ceph: Mount failed due to unknown key error"
306                                " %d: %s\n", key_err, name);
307                 }
308                 err = -EPERM;
309                 goto out;
310         }
311
312         ckey = ukey->payload.data;
313         err = ceph_crypto_key_clone(dst, ckey);
314         if (err)
315                 goto out_key;
316         /* pass through, err is 0 */
317
318 out_key:
319         key_put(ukey);
320 out:
321         return err;
322 }
323
324 struct ceph_options *
325 ceph_parse_options(char *options, const char *dev_name,
326                         const char *dev_name_end,
327                         int (*parse_extra_token)(char *c, void *private),
328                         void *private)
329 {
330         struct ceph_options *opt;
331         const char *c;
332         int err = -ENOMEM;
333         substring_t argstr[MAX_OPT_ARGS];
334
335         if (current->nsproxy->net_ns != &init_net)
336                 return ERR_PTR(-EINVAL);
337
338         opt = kzalloc(sizeof(*opt), GFP_KERNEL);
339         if (!opt)
340                 return ERR_PTR(-ENOMEM);
341         opt->mon_addr = kcalloc(CEPH_MAX_MON, sizeof(*opt->mon_addr),
342                                 GFP_KERNEL);
343         if (!opt->mon_addr)
344                 goto out;
345
346         dout("parse_options %p options '%s' dev_name '%s'\n", opt, options,
347              dev_name);
348
349         /* start with defaults */
350         opt->flags = CEPH_OPT_DEFAULT;
351         opt->osd_keepalive_timeout = CEPH_OSD_KEEPALIVE_DEFAULT;
352         opt->mount_timeout = CEPH_MOUNT_TIMEOUT_DEFAULT; /* seconds */
353         opt->osd_idle_ttl = CEPH_OSD_IDLE_TTL_DEFAULT;   /* seconds */
354
355         /* get mon ip(s) */
356         /* ip1[:port1][,ip2[:port2]...] */
357         err = ceph_parse_ips(dev_name, dev_name_end, opt->mon_addr,
358                              CEPH_MAX_MON, &opt->num_mon);
359         if (err < 0)
360                 goto out;
361
362         /* parse mount options */
363         while ((c = strsep(&options, ",")) != NULL) {
364                 int token, intval, ret;
365                 if (!*c)
366                         continue;
367                 err = -EINVAL;
368                 token = match_token((char *)c, opt_tokens, argstr);
369                 if (token < 0 && parse_extra_token) {
370                         /* extra? */
371                         err = parse_extra_token((char *)c, private);
372                         if (err < 0) {
373                                 pr_err("bad option at '%s'\n", c);
374                                 goto out;
375                         }
376                         continue;
377                 }
378                 if (token < Opt_last_int) {
379                         ret = match_int(&argstr[0], &intval);
380                         if (ret < 0) {
381                                 pr_err("bad mount option arg (not int) "
382                                        "at '%s'\n", c);
383                                 continue;
384                         }
385                         dout("got int token %d val %d\n", token, intval);
386                 } else if (token > Opt_last_int && token < Opt_last_string) {
387                         dout("got string token %d val %s\n", token,
388                              argstr[0].from);
389                 } else {
390                         dout("got token %d\n", token);
391                 }
392                 switch (token) {
393                 case Opt_ip:
394                         err = ceph_parse_ips(argstr[0].from,
395                                              argstr[0].to,
396                                              &opt->my_addr,
397                                              1, NULL);
398                         if (err < 0)
399                                 goto out;
400                         opt->flags |= CEPH_OPT_MYIP;
401                         break;
402
403                 case Opt_fsid:
404                         err = parse_fsid(argstr[0].from, &opt->fsid);
405                         if (err == 0)
406                                 opt->flags |= CEPH_OPT_FSID;
407                         break;
408                 case Opt_name:
409                         opt->name = kstrndup(argstr[0].from,
410                                               argstr[0].to-argstr[0].from,
411                                               GFP_KERNEL);
412                         break;
413                 case Opt_secret:
414                         opt->key = kzalloc(sizeof(*opt->key), GFP_KERNEL);
415                         if (!opt->key) {
416                                 err = -ENOMEM;
417                                 goto out;
418                         }
419                         err = ceph_crypto_key_unarmor(opt->key, argstr[0].from);
420                         if (err < 0)
421                                 goto out;
422                         break;
423                 case Opt_key:
424                         opt->key = kzalloc(sizeof(*opt->key), GFP_KERNEL);
425                         if (!opt->key) {
426                                 err = -ENOMEM;
427                                 goto out;
428                         }
429                         err = get_secret(opt->key, argstr[0].from);
430                         if (err < 0)
431                                 goto out;
432                         break;
433
434                         /* misc */
435                 case Opt_osdtimeout:
436                         pr_warning("ignoring deprecated osdtimeout option\n");
437                         break;
438                 case Opt_osdkeepalivetimeout:
439                         opt->osd_keepalive_timeout = intval;
440                         break;
441                 case Opt_osd_idle_ttl:
442                         opt->osd_idle_ttl = intval;
443                         break;
444                 case Opt_mount_timeout:
445                         opt->mount_timeout = intval;
446                         break;
447
448                 case Opt_share:
449                         opt->flags &= ~CEPH_OPT_NOSHARE;
450                         break;
451                 case Opt_noshare:
452                         opt->flags |= CEPH_OPT_NOSHARE;
453                         break;
454
455                 case Opt_crc:
456                         opt->flags &= ~CEPH_OPT_NOCRC;
457                         break;
458                 case Opt_nocrc:
459                         opt->flags |= CEPH_OPT_NOCRC;
460                         break;
461
462                 default:
463                         BUG_ON(token);
464                 }
465         }
466
467         /* success */
468         return opt;
469
470 out:
471         ceph_destroy_options(opt);
472         return ERR_PTR(err);
473 }
474 EXPORT_SYMBOL(ceph_parse_options);
475
476 u64 ceph_client_id(struct ceph_client *client)
477 {
478         return client->monc.auth->global_id;
479 }
480 EXPORT_SYMBOL(ceph_client_id);
481
482 /*
483  * create a fresh client instance
484  */
485 struct ceph_client *ceph_create_client(struct ceph_options *opt, void *private,
486                                        u64 supported_features,
487                                        u64 required_features)
488 {
489         struct ceph_client *client;
490         struct ceph_entity_addr *myaddr = NULL;
491         int err = -ENOMEM;
492
493         client = kzalloc(sizeof(*client), GFP_KERNEL);
494         if (client == NULL)
495                 return ERR_PTR(-ENOMEM);
496
497         client->private = private;
498         client->options = opt;
499
500         mutex_init(&client->mount_mutex);
501         init_waitqueue_head(&client->auth_wq);
502         client->auth_err = 0;
503
504         client->extra_mon_dispatch = NULL;
505         client->supported_features = CEPH_FEATURES_SUPPORTED_DEFAULT |
506                 supported_features;
507         client->required_features = CEPH_FEATURES_REQUIRED_DEFAULT |
508                 required_features;
509
510         /* msgr */
511         if (ceph_test_opt(client, MYIP))
512                 myaddr = &client->options->my_addr;
513         ceph_messenger_init(&client->msgr, myaddr,
514                 client->supported_features,
515                 client->required_features,
516                 ceph_test_opt(client, NOCRC));
517
518         /* subsystems */
519         err = ceph_monc_init(&client->monc, client);
520         if (err < 0)
521                 goto fail;
522         err = ceph_osdc_init(&client->osdc, client);
523         if (err < 0)
524                 goto fail_monc;
525
526         return client;
527
528 fail_monc:
529         ceph_monc_stop(&client->monc);
530 fail:
531         kfree(client);
532         return ERR_PTR(err);
533 }
534 EXPORT_SYMBOL(ceph_create_client);
535
536 void ceph_destroy_client(struct ceph_client *client)
537 {
538         dout("destroy_client %p\n", client);
539
540         atomic_set(&client->msgr.stopping, 1);
541
542         /* unmount */
543         ceph_osdc_stop(&client->osdc);
544
545         ceph_monc_stop(&client->monc);
546
547         ceph_debugfs_client_cleanup(client);
548
549         ceph_destroy_options(client->options);
550
551         kfree(client);
552         dout("destroy_client %p done\n", client);
553 }
554 EXPORT_SYMBOL(ceph_destroy_client);
555
556 /*
557  * true if we have the mon map (and have thus joined the cluster)
558  */
559 static int have_mon_and_osd_map(struct ceph_client *client)
560 {
561         return client->monc.monmap && client->monc.monmap->epoch &&
562                client->osdc.osdmap && client->osdc.osdmap->epoch;
563 }
564
565 /*
566  * mount: join the ceph cluster, and open root directory.
567  */
568 int __ceph_open_session(struct ceph_client *client, unsigned long started)
569 {
570         int err;
571         unsigned long timeout = client->options->mount_timeout * HZ;
572
573         /* open session, and wait for mon and osd maps */
574         err = ceph_monc_open_session(&client->monc);
575         if (err < 0)
576                 return err;
577
578         while (!have_mon_and_osd_map(client)) {
579                 err = -EIO;
580                 if (timeout && time_after_eq(jiffies, started + timeout))
581                         return err;
582
583                 /* wait */
584                 dout("mount waiting for mon_map\n");
585                 err = wait_event_interruptible_timeout(client->auth_wq,
586                         have_mon_and_osd_map(client) || (client->auth_err < 0),
587                         timeout);
588                 if (err == -EINTR || err == -ERESTARTSYS)
589                         return err;
590                 if (client->auth_err < 0)
591                         return client->auth_err;
592         }
593
594         return 0;
595 }
596 EXPORT_SYMBOL(__ceph_open_session);
597
598
599 int ceph_open_session(struct ceph_client *client)
600 {
601         int ret;
602         unsigned long started = jiffies;  /* note the start time */
603
604         dout("open_session start\n");
605         mutex_lock(&client->mount_mutex);
606
607         ret = __ceph_open_session(client, started);
608
609         mutex_unlock(&client->mount_mutex);
610         return ret;
611 }
612 EXPORT_SYMBOL(ceph_open_session);
613
614
615 static int __init init_ceph_lib(void)
616 {
617         int ret = 0;
618
619         ret = ceph_debugfs_init();
620         if (ret < 0)
621                 goto out;
622
623         ret = ceph_crypto_init();
624         if (ret < 0)
625                 goto out_debugfs;
626
627         ret = ceph_msgr_init();
628         if (ret < 0)
629                 goto out_crypto;
630
631         ret = ceph_osdc_setup();
632         if (ret < 0)
633                 goto out_msgr;
634
635         pr_info("loaded (mon/osd proto %d/%d)\n",
636                 CEPH_MONC_PROTOCOL, CEPH_OSDC_PROTOCOL);
637
638         return 0;
639
640 out_msgr:
641         ceph_msgr_exit();
642 out_crypto:
643         ceph_crypto_shutdown();
644 out_debugfs:
645         ceph_debugfs_cleanup();
646 out:
647         return ret;
648 }
649
650 static void __exit exit_ceph_lib(void)
651 {
652         dout("exit_ceph_lib\n");
653         ceph_osdc_cleanup();
654         ceph_msgr_exit();
655         ceph_crypto_shutdown();
656         ceph_debugfs_cleanup();
657 }
658
659 module_init(init_ceph_lib);
660 module_exit(exit_ceph_lib);
661
662 MODULE_AUTHOR("Sage Weil <sage@newdream.net>");
663 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>");
664 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>");
665 MODULE_DESCRIPTION("Ceph filesystem for Linux");
666 MODULE_LICENSE("GPL");