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