Loading...
1// SPDX-License-Identifier: GPL-2.0-or-later
2/* /proc interface for AFS
3 *
4 * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells (dhowells@redhat.com)
6 */
7
8#include <linux/slab.h>
9#include <linux/module.h>
10#include <linux/proc_fs.h>
11#include <linux/seq_file.h>
12#include <linux/sched.h>
13#include <linux/uaccess.h>
14#include "internal.h"
15
16struct afs_vl_seq_net_private {
17 struct seq_net_private seq; /* Must be first */
18 struct afs_vlserver_list *vllist;
19};
20
21static inline struct afs_net *afs_seq2net(struct seq_file *m)
22{
23 return afs_net(seq_file_net(m));
24}
25
26static inline struct afs_net *afs_seq2net_single(struct seq_file *m)
27{
28 return afs_net(seq_file_single_net(m));
29}
30
31/*
32 * Display the list of cells known to the namespace.
33 */
34static int afs_proc_cells_show(struct seq_file *m, void *v)
35{
36 struct afs_vlserver_list *vllist;
37 struct afs_cell *cell;
38
39 if (v == SEQ_START_TOKEN) {
40 /* display header on line 1 */
41 seq_puts(m, "USE ACT TTL SV ST NAME\n");
42 return 0;
43 }
44
45 cell = list_entry(v, struct afs_cell, proc_link);
46 vllist = rcu_dereference(cell->vl_servers);
47
48 /* display one cell per line on subsequent lines */
49 seq_printf(m, "%3u %3u %6lld %2u %2u %s\n",
50 refcount_read(&cell->ref),
51 atomic_read(&cell->active),
52 cell->dns_expiry - ktime_get_real_seconds(),
53 vllist ? vllist->nr_servers : 0,
54 cell->state,
55 cell->name);
56 return 0;
57}
58
59static void *afs_proc_cells_start(struct seq_file *m, loff_t *_pos)
60 __acquires(rcu)
61{
62 rcu_read_lock();
63 return seq_hlist_start_head_rcu(&afs_seq2net(m)->proc_cells, *_pos);
64}
65
66static void *afs_proc_cells_next(struct seq_file *m, void *v, loff_t *pos)
67{
68 return seq_hlist_next_rcu(v, &afs_seq2net(m)->proc_cells, pos);
69}
70
71static void afs_proc_cells_stop(struct seq_file *m, void *v)
72 __releases(rcu)
73{
74 rcu_read_unlock();
75}
76
77static const struct seq_operations afs_proc_cells_ops = {
78 .start = afs_proc_cells_start,
79 .next = afs_proc_cells_next,
80 .stop = afs_proc_cells_stop,
81 .show = afs_proc_cells_show,
82};
83
84/*
85 * handle writes to /proc/fs/afs/cells
86 * - to add cells: echo "add <cellname> <IP>[:<IP>][:<IP>]"
87 */
88static int afs_proc_cells_write(struct file *file, char *buf, size_t size)
89{
90 struct seq_file *m = file->private_data;
91 struct afs_net *net = afs_seq2net(m);
92 char *name, *args;
93 int ret;
94
95 /* trim to first NL */
96 name = memchr(buf, '\n', size);
97 if (name)
98 *name = 0;
99
100 /* split into command, name and argslist */
101 name = strchr(buf, ' ');
102 if (!name)
103 goto inval;
104 do {
105 *name++ = 0;
106 } while(*name == ' ');
107 if (!*name)
108 goto inval;
109
110 args = strchr(name, ' ');
111 if (args) {
112 do {
113 *args++ = 0;
114 } while(*args == ' ');
115 if (!*args)
116 goto inval;
117 }
118
119 /* determine command to perform */
120 _debug("cmd=%s name=%s args=%s", buf, name, args);
121
122 if (strcmp(buf, "add") == 0) {
123 struct afs_cell *cell;
124
125 cell = afs_lookup_cell(net, name, strlen(name), args, true);
126 if (IS_ERR(cell)) {
127 ret = PTR_ERR(cell);
128 goto done;
129 }
130
131 if (test_and_set_bit(AFS_CELL_FL_NO_GC, &cell->flags))
132 afs_unuse_cell(net, cell, afs_cell_trace_unuse_no_pin);
133 } else {
134 goto inval;
135 }
136
137 ret = 0;
138
139done:
140 _leave(" = %d", ret);
141 return ret;
142
143inval:
144 ret = -EINVAL;
145 printk("kAFS: Invalid Command on /proc/fs/afs/cells file\n");
146 goto done;
147}
148
149/*
150 * Display the name of the current workstation cell.
151 */
152static int afs_proc_rootcell_show(struct seq_file *m, void *v)
153{
154 struct afs_cell *cell;
155 struct afs_net *net;
156
157 net = afs_seq2net_single(m);
158 down_read(&net->cells_lock);
159 cell = net->ws_cell;
160 if (cell)
161 seq_printf(m, "%s\n", cell->name);
162 up_read(&net->cells_lock);
163 return 0;
164}
165
166/*
167 * Set the current workstation cell and optionally supply its list of volume
168 * location servers.
169 *
170 * echo "cell.name:192.168.231.14" >/proc/fs/afs/rootcell
171 */
172static int afs_proc_rootcell_write(struct file *file, char *buf, size_t size)
173{
174 struct seq_file *m = file->private_data;
175 struct afs_net *net = afs_seq2net_single(m);
176 char *s;
177 int ret;
178
179 ret = -EINVAL;
180 if (buf[0] == '.')
181 goto out;
182 if (memchr(buf, '/', size))
183 goto out;
184
185 /* trim to first NL */
186 s = memchr(buf, '\n', size);
187 if (s)
188 *s = 0;
189
190 /* determine command to perform */
191 _debug("rootcell=%s", buf);
192
193 ret = afs_cell_init(net, buf);
194
195out:
196 _leave(" = %d", ret);
197 return ret;
198}
199
200static const char afs_vol_types[3][3] = {
201 [AFSVL_RWVOL] = "RW",
202 [AFSVL_ROVOL] = "RO",
203 [AFSVL_BACKVOL] = "BK",
204};
205
206/*
207 * Display the list of volumes known to a cell.
208 */
209static int afs_proc_cell_volumes_show(struct seq_file *m, void *v)
210{
211 struct afs_volume *vol = hlist_entry(v, struct afs_volume, proc_link);
212
213 /* Display header on line 1 */
214 if (v == SEQ_START_TOKEN) {
215 seq_puts(m, "USE VID TY NAME\n");
216 return 0;
217 }
218
219 seq_printf(m, "%3d %08llx %s %s\n",
220 refcount_read(&vol->ref), vol->vid,
221 afs_vol_types[vol->type],
222 vol->name);
223
224 return 0;
225}
226
227static void *afs_proc_cell_volumes_start(struct seq_file *m, loff_t *_pos)
228 __acquires(cell->proc_lock)
229{
230 struct afs_cell *cell = pde_data(file_inode(m->file));
231
232 rcu_read_lock();
233 return seq_hlist_start_head_rcu(&cell->proc_volumes, *_pos);
234}
235
236static void *afs_proc_cell_volumes_next(struct seq_file *m, void *v,
237 loff_t *_pos)
238{
239 struct afs_cell *cell = pde_data(file_inode(m->file));
240
241 return seq_hlist_next_rcu(v, &cell->proc_volumes, _pos);
242}
243
244static void afs_proc_cell_volumes_stop(struct seq_file *m, void *v)
245 __releases(cell->proc_lock)
246{
247 rcu_read_unlock();
248}
249
250static const struct seq_operations afs_proc_cell_volumes_ops = {
251 .start = afs_proc_cell_volumes_start,
252 .next = afs_proc_cell_volumes_next,
253 .stop = afs_proc_cell_volumes_stop,
254 .show = afs_proc_cell_volumes_show,
255};
256
257static const char *const dns_record_sources[NR__dns_record_source + 1] = {
258 [DNS_RECORD_UNAVAILABLE] = "unav",
259 [DNS_RECORD_FROM_CONFIG] = "cfg",
260 [DNS_RECORD_FROM_DNS_A] = "A",
261 [DNS_RECORD_FROM_DNS_AFSDB] = "AFSDB",
262 [DNS_RECORD_FROM_DNS_SRV] = "SRV",
263 [DNS_RECORD_FROM_NSS] = "nss",
264 [NR__dns_record_source] = "[weird]"
265};
266
267static const char *const dns_lookup_statuses[NR__dns_lookup_status + 1] = {
268 [DNS_LOOKUP_NOT_DONE] = "no-lookup",
269 [DNS_LOOKUP_GOOD] = "good",
270 [DNS_LOOKUP_GOOD_WITH_BAD] = "good/bad",
271 [DNS_LOOKUP_BAD] = "bad",
272 [DNS_LOOKUP_GOT_NOT_FOUND] = "not-found",
273 [DNS_LOOKUP_GOT_LOCAL_FAILURE] = "local-failure",
274 [DNS_LOOKUP_GOT_TEMP_FAILURE] = "temp-failure",
275 [DNS_LOOKUP_GOT_NS_FAILURE] = "ns-failure",
276 [NR__dns_lookup_status] = "[weird]"
277};
278
279/*
280 * Display the list of Volume Location servers we're using for a cell.
281 */
282static int afs_proc_cell_vlservers_show(struct seq_file *m, void *v)
283{
284 const struct afs_vl_seq_net_private *priv = m->private;
285 const struct afs_vlserver_list *vllist = priv->vllist;
286 const struct afs_vlserver_entry *entry;
287 const struct afs_vlserver *vlserver;
288 const struct afs_addr_list *alist;
289 int i;
290
291 if (v == SEQ_START_TOKEN) {
292 seq_printf(m, "# source %s, status %s\n",
293 dns_record_sources[vllist ? vllist->source : 0],
294 dns_lookup_statuses[vllist ? vllist->status : 0]);
295 return 0;
296 }
297
298 entry = v;
299 vlserver = entry->server;
300 alist = rcu_dereference(vlserver->addresses);
301
302 seq_printf(m, "%s [p=%hu w=%hu s=%s,%s]:\n",
303 vlserver->name, entry->priority, entry->weight,
304 dns_record_sources[alist ? alist->source : entry->source],
305 dns_lookup_statuses[alist ? alist->status : entry->status]);
306 if (alist) {
307 for (i = 0; i < alist->nr_addrs; i++)
308 seq_printf(m, " %c %pISpc\n",
309 alist->preferred == i ? '>' : '-',
310 &alist->addrs[i].transport);
311 }
312 seq_printf(m, " info: fl=%lx rtt=%d\n", vlserver->flags, vlserver->rtt);
313 seq_printf(m, " probe: fl=%x e=%d ac=%d out=%d\n",
314 vlserver->probe.flags, vlserver->probe.error,
315 vlserver->probe.abort_code,
316 atomic_read(&vlserver->probe_outstanding));
317 return 0;
318}
319
320static void *afs_proc_cell_vlservers_start(struct seq_file *m, loff_t *_pos)
321 __acquires(rcu)
322{
323 struct afs_vl_seq_net_private *priv = m->private;
324 struct afs_vlserver_list *vllist;
325 struct afs_cell *cell = pde_data(file_inode(m->file));
326 loff_t pos = *_pos;
327
328 rcu_read_lock();
329
330 vllist = rcu_dereference(cell->vl_servers);
331 priv->vllist = vllist;
332
333 if (pos < 0)
334 *_pos = pos = 0;
335 if (pos == 0)
336 return SEQ_START_TOKEN;
337
338 if (pos - 1 >= vllist->nr_servers)
339 return NULL;
340
341 return &vllist->servers[pos - 1];
342}
343
344static void *afs_proc_cell_vlservers_next(struct seq_file *m, void *v,
345 loff_t *_pos)
346{
347 struct afs_vl_seq_net_private *priv = m->private;
348 struct afs_vlserver_list *vllist = priv->vllist;
349 loff_t pos;
350
351 pos = *_pos;
352 pos++;
353 *_pos = pos;
354 if (!vllist || pos - 1 >= vllist->nr_servers)
355 return NULL;
356
357 return &vllist->servers[pos - 1];
358}
359
360static void afs_proc_cell_vlservers_stop(struct seq_file *m, void *v)
361 __releases(rcu)
362{
363 rcu_read_unlock();
364}
365
366static const struct seq_operations afs_proc_cell_vlservers_ops = {
367 .start = afs_proc_cell_vlservers_start,
368 .next = afs_proc_cell_vlservers_next,
369 .stop = afs_proc_cell_vlservers_stop,
370 .show = afs_proc_cell_vlservers_show,
371};
372
373/*
374 * Display the list of fileservers we're using within a namespace.
375 */
376static int afs_proc_servers_show(struct seq_file *m, void *v)
377{
378 struct afs_server *server;
379 struct afs_addr_list *alist;
380 int i;
381
382 if (v == SEQ_START_TOKEN) {
383 seq_puts(m, "UUID REF ACT\n");
384 return 0;
385 }
386
387 server = list_entry(v, struct afs_server, proc_link);
388 alist = rcu_dereference(server->addresses);
389 seq_printf(m, "%pU %3d %3d\n",
390 &server->uuid,
391 refcount_read(&server->ref),
392 atomic_read(&server->active));
393 seq_printf(m, " - info: fl=%lx rtt=%u brk=%x\n",
394 server->flags, server->rtt, server->cb_s_break);
395 seq_printf(m, " - probe: last=%d out=%d\n",
396 (int)(jiffies - server->probed_at) / HZ,
397 atomic_read(&server->probe_outstanding));
398 seq_printf(m, " - ALIST v=%u rsp=%lx f=%lx\n",
399 alist->version, alist->responded, alist->failed);
400 for (i = 0; i < alist->nr_addrs; i++)
401 seq_printf(m, " [%x] %pISpc%s\n",
402 i, &alist->addrs[i].transport,
403 alist->preferred == i ? "*" : "");
404 return 0;
405}
406
407static void *afs_proc_servers_start(struct seq_file *m, loff_t *_pos)
408 __acquires(rcu)
409{
410 rcu_read_lock();
411 return seq_hlist_start_head_rcu(&afs_seq2net(m)->fs_proc, *_pos);
412}
413
414static void *afs_proc_servers_next(struct seq_file *m, void *v, loff_t *_pos)
415{
416 return seq_hlist_next_rcu(v, &afs_seq2net(m)->fs_proc, _pos);
417}
418
419static void afs_proc_servers_stop(struct seq_file *m, void *v)
420 __releases(rcu)
421{
422 rcu_read_unlock();
423}
424
425static const struct seq_operations afs_proc_servers_ops = {
426 .start = afs_proc_servers_start,
427 .next = afs_proc_servers_next,
428 .stop = afs_proc_servers_stop,
429 .show = afs_proc_servers_show,
430};
431
432/*
433 * Display the list of strings that may be substituted for the @sys pathname
434 * macro.
435 */
436static int afs_proc_sysname_show(struct seq_file *m, void *v)
437{
438 struct afs_net *net = afs_seq2net(m);
439 struct afs_sysnames *sysnames = net->sysnames;
440 unsigned int i = (unsigned long)v - 1;
441
442 if (i < sysnames->nr)
443 seq_printf(m, "%s\n", sysnames->subs[i]);
444 return 0;
445}
446
447static void *afs_proc_sysname_start(struct seq_file *m, loff_t *pos)
448 __acquires(&net->sysnames_lock)
449{
450 struct afs_net *net = afs_seq2net(m);
451 struct afs_sysnames *names;
452
453 read_lock(&net->sysnames_lock);
454
455 names = net->sysnames;
456 if (*pos >= names->nr)
457 return NULL;
458 return (void *)(unsigned long)(*pos + 1);
459}
460
461static void *afs_proc_sysname_next(struct seq_file *m, void *v, loff_t *pos)
462{
463 struct afs_net *net = afs_seq2net(m);
464 struct afs_sysnames *names = net->sysnames;
465
466 *pos += 1;
467 if (*pos >= names->nr)
468 return NULL;
469 return (void *)(unsigned long)(*pos + 1);
470}
471
472static void afs_proc_sysname_stop(struct seq_file *m, void *v)
473 __releases(&net->sysnames_lock)
474{
475 struct afs_net *net = afs_seq2net(m);
476
477 read_unlock(&net->sysnames_lock);
478}
479
480static const struct seq_operations afs_proc_sysname_ops = {
481 .start = afs_proc_sysname_start,
482 .next = afs_proc_sysname_next,
483 .stop = afs_proc_sysname_stop,
484 .show = afs_proc_sysname_show,
485};
486
487/*
488 * Allow the @sys substitution to be configured.
489 */
490static int afs_proc_sysname_write(struct file *file, char *buf, size_t size)
491{
492 struct afs_sysnames *sysnames, *kill;
493 struct seq_file *m = file->private_data;
494 struct afs_net *net = afs_seq2net(m);
495 char *s, *p, *sub;
496 int ret, len;
497
498 sysnames = kzalloc(sizeof(*sysnames), GFP_KERNEL);
499 if (!sysnames)
500 return -ENOMEM;
501 refcount_set(&sysnames->usage, 1);
502 kill = sysnames;
503
504 p = buf;
505 while ((s = strsep(&p, " \t\n"))) {
506 len = strlen(s);
507 if (len == 0)
508 continue;
509 ret = -ENAMETOOLONG;
510 if (len >= AFSNAMEMAX)
511 goto error;
512
513 if (len >= 4 &&
514 s[len - 4] == '@' &&
515 s[len - 3] == 's' &&
516 s[len - 2] == 'y' &&
517 s[len - 1] == 's')
518 /* Protect against recursion */
519 goto invalid;
520
521 if (s[0] == '.' &&
522 (len < 2 || (len == 2 && s[1] == '.')))
523 goto invalid;
524
525 if (memchr(s, '/', len))
526 goto invalid;
527
528 ret = -EFBIG;
529 if (sysnames->nr >= AFS_NR_SYSNAME)
530 goto out;
531
532 if (strcmp(s, afs_init_sysname) == 0) {
533 sub = (char *)afs_init_sysname;
534 } else {
535 ret = -ENOMEM;
536 sub = kmemdup(s, len + 1, GFP_KERNEL);
537 if (!sub)
538 goto out;
539 }
540
541 sysnames->subs[sysnames->nr] = sub;
542 sysnames->nr++;
543 }
544
545 if (sysnames->nr == 0) {
546 sysnames->subs[0] = sysnames->blank;
547 sysnames->nr++;
548 }
549
550 write_lock(&net->sysnames_lock);
551 kill = net->sysnames;
552 net->sysnames = sysnames;
553 write_unlock(&net->sysnames_lock);
554 ret = 0;
555out:
556 afs_put_sysnames(kill);
557 return ret;
558
559invalid:
560 ret = -EINVAL;
561error:
562 goto out;
563}
564
565void afs_put_sysnames(struct afs_sysnames *sysnames)
566{
567 int i;
568
569 if (sysnames && refcount_dec_and_test(&sysnames->usage)) {
570 for (i = 0; i < sysnames->nr; i++)
571 if (sysnames->subs[i] != afs_init_sysname &&
572 sysnames->subs[i] != sysnames->blank)
573 kfree(sysnames->subs[i]);
574 kfree(sysnames);
575 }
576}
577
578/*
579 * Display general per-net namespace statistics
580 */
581static int afs_proc_stats_show(struct seq_file *m, void *v)
582{
583 struct afs_net *net = afs_seq2net_single(m);
584
585 seq_puts(m, "kAFS statistics\n");
586
587 seq_printf(m, "dir-mgmt: look=%u reval=%u inval=%u relpg=%u\n",
588 atomic_read(&net->n_lookup),
589 atomic_read(&net->n_reval),
590 atomic_read(&net->n_inval),
591 atomic_read(&net->n_relpg));
592
593 seq_printf(m, "dir-data: rdpg=%u\n",
594 atomic_read(&net->n_read_dir));
595
596 seq_printf(m, "dir-edit: cr=%u rm=%u\n",
597 atomic_read(&net->n_dir_cr),
598 atomic_read(&net->n_dir_rm));
599
600 seq_printf(m, "file-rd : n=%u nb=%lu\n",
601 atomic_read(&net->n_fetches),
602 atomic_long_read(&net->n_fetch_bytes));
603 seq_printf(m, "file-wr : n=%u nb=%lu\n",
604 atomic_read(&net->n_stores),
605 atomic_long_read(&net->n_store_bytes));
606 return 0;
607}
608
609/*
610 * initialise /proc/fs/afs/<cell>/
611 */
612int afs_proc_cell_setup(struct afs_cell *cell)
613{
614 struct proc_dir_entry *dir;
615 struct afs_net *net = cell->net;
616
617 _enter("%p{%s},%p", cell, cell->name, net->proc_afs);
618
619 dir = proc_net_mkdir(net->net, cell->name, net->proc_afs);
620 if (!dir)
621 goto error_dir;
622
623 if (!proc_create_net_data("vlservers", 0444, dir,
624 &afs_proc_cell_vlservers_ops,
625 sizeof(struct afs_vl_seq_net_private),
626 cell) ||
627 !proc_create_net_data("volumes", 0444, dir,
628 &afs_proc_cell_volumes_ops,
629 sizeof(struct seq_net_private),
630 cell))
631 goto error_tree;
632
633 _leave(" = 0");
634 return 0;
635
636error_tree:
637 remove_proc_subtree(cell->name, net->proc_afs);
638error_dir:
639 _leave(" = -ENOMEM");
640 return -ENOMEM;
641}
642
643/*
644 * remove /proc/fs/afs/<cell>/
645 */
646void afs_proc_cell_remove(struct afs_cell *cell)
647{
648 struct afs_net *net = cell->net;
649
650 _enter("");
651 remove_proc_subtree(cell->name, net->proc_afs);
652 _leave("");
653}
654
655/*
656 * initialise the /proc/fs/afs/ directory
657 */
658int afs_proc_init(struct afs_net *net)
659{
660 struct proc_dir_entry *p;
661
662 _enter("");
663
664 p = proc_net_mkdir(net->net, "afs", net->net->proc_net);
665 if (!p)
666 goto error_dir;
667
668 if (!proc_create_net_data_write("cells", 0644, p,
669 &afs_proc_cells_ops,
670 afs_proc_cells_write,
671 sizeof(struct seq_net_private),
672 NULL) ||
673 !proc_create_net_single_write("rootcell", 0644, p,
674 afs_proc_rootcell_show,
675 afs_proc_rootcell_write,
676 NULL) ||
677 !proc_create_net("servers", 0444, p, &afs_proc_servers_ops,
678 sizeof(struct seq_net_private)) ||
679 !proc_create_net_single("stats", 0444, p, afs_proc_stats_show, NULL) ||
680 !proc_create_net_data_write("sysname", 0644, p,
681 &afs_proc_sysname_ops,
682 afs_proc_sysname_write,
683 sizeof(struct seq_net_private),
684 NULL))
685 goto error_tree;
686
687 net->proc_afs = p;
688 _leave(" = 0");
689 return 0;
690
691error_tree:
692 proc_remove(p);
693error_dir:
694 _leave(" = -ENOMEM");
695 return -ENOMEM;
696}
697
698/*
699 * clean up the /proc/fs/afs/ directory
700 */
701void afs_proc_cleanup(struct afs_net *net)
702{
703 proc_remove(net->proc_afs);
704 net->proc_afs = NULL;
705}
1// SPDX-License-Identifier: GPL-2.0-or-later
2/* /proc interface for AFS
3 *
4 * Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells (dhowells@redhat.com)
6 */
7
8#include <linux/slab.h>
9#include <linux/module.h>
10#include <linux/proc_fs.h>
11#include <linux/seq_file.h>
12#include <linux/sched.h>
13#include <linux/uaccess.h>
14#include "internal.h"
15
16struct afs_vl_seq_net_private {
17 struct seq_net_private seq; /* Must be first */
18 struct afs_vlserver_list *vllist;
19};
20
21static inline struct afs_net *afs_seq2net(struct seq_file *m)
22{
23 return afs_net(seq_file_net(m));
24}
25
26static inline struct afs_net *afs_seq2net_single(struct seq_file *m)
27{
28 return afs_net(seq_file_single_net(m));
29}
30
31/*
32 * Display the list of cells known to the namespace.
33 */
34static int afs_proc_cells_show(struct seq_file *m, void *v)
35{
36 struct afs_vlserver_list *vllist;
37 struct afs_cell *cell;
38
39 if (v == SEQ_START_TOKEN) {
40 /* display header on line 1 */
41 seq_puts(m, "USE ACT TTL SV ST NAME\n");
42 return 0;
43 }
44
45 cell = list_entry(v, struct afs_cell, proc_link);
46 vllist = rcu_dereference(cell->vl_servers);
47
48 /* display one cell per line on subsequent lines */
49 seq_printf(m, "%3u %3u %6lld %2u %2u %s\n",
50 refcount_read(&cell->ref),
51 atomic_read(&cell->active),
52 cell->dns_expiry - ktime_get_real_seconds(),
53 vllist ? vllist->nr_servers : 0,
54 cell->state,
55 cell->name);
56 return 0;
57}
58
59static void *afs_proc_cells_start(struct seq_file *m, loff_t *_pos)
60 __acquires(rcu)
61{
62 rcu_read_lock();
63 return seq_hlist_start_head_rcu(&afs_seq2net(m)->proc_cells, *_pos);
64}
65
66static void *afs_proc_cells_next(struct seq_file *m, void *v, loff_t *pos)
67{
68 return seq_hlist_next_rcu(v, &afs_seq2net(m)->proc_cells, pos);
69}
70
71static void afs_proc_cells_stop(struct seq_file *m, void *v)
72 __releases(rcu)
73{
74 rcu_read_unlock();
75}
76
77static const struct seq_operations afs_proc_cells_ops = {
78 .start = afs_proc_cells_start,
79 .next = afs_proc_cells_next,
80 .stop = afs_proc_cells_stop,
81 .show = afs_proc_cells_show,
82};
83
84/*
85 * handle writes to /proc/fs/afs/cells
86 * - to add cells: echo "add <cellname> <IP>[:<IP>][:<IP>]"
87 */
88static int afs_proc_cells_write(struct file *file, char *buf, size_t size)
89{
90 struct seq_file *m = file->private_data;
91 struct afs_net *net = afs_seq2net(m);
92 char *name, *args;
93 int ret;
94
95 /* trim to first NL */
96 name = memchr(buf, '\n', size);
97 if (name)
98 *name = 0;
99
100 /* split into command, name and argslist */
101 name = strchr(buf, ' ');
102 if (!name)
103 goto inval;
104 do {
105 *name++ = 0;
106 } while(*name == ' ');
107 if (!*name)
108 goto inval;
109
110 args = strchr(name, ' ');
111 if (args) {
112 do {
113 *args++ = 0;
114 } while(*args == ' ');
115 if (!*args)
116 goto inval;
117 }
118
119 /* determine command to perform */
120 _debug("cmd=%s name=%s args=%s", buf, name, args);
121
122 if (strcmp(buf, "add") == 0) {
123 struct afs_cell *cell;
124
125 cell = afs_lookup_cell(net, name, strlen(name), args, true);
126 if (IS_ERR(cell)) {
127 ret = PTR_ERR(cell);
128 goto done;
129 }
130
131 if (test_and_set_bit(AFS_CELL_FL_NO_GC, &cell->flags))
132 afs_unuse_cell(net, cell, afs_cell_trace_unuse_no_pin);
133 } else {
134 goto inval;
135 }
136
137 ret = 0;
138
139done:
140 _leave(" = %d", ret);
141 return ret;
142
143inval:
144 ret = -EINVAL;
145 printk("kAFS: Invalid Command on /proc/fs/afs/cells file\n");
146 goto done;
147}
148
149/*
150 * Display the list of addr_prefs known to the namespace.
151 */
152static int afs_proc_addr_prefs_show(struct seq_file *m, void *v)
153{
154 struct afs_addr_preference_list *preflist;
155 struct afs_addr_preference *pref;
156 struct afs_net *net = afs_seq2net_single(m);
157 union {
158 struct sockaddr_in sin;
159 struct sockaddr_in6 sin6;
160 } addr;
161 unsigned int i;
162 char buf[44]; /* Maximum ipv6 + max subnet is 43 */
163
164 rcu_read_lock();
165 preflist = rcu_dereference(net->address_prefs);
166
167 if (!preflist) {
168 seq_puts(m, "NO PREFS\n");
169 goto out;
170 }
171
172 seq_printf(m, "PROT SUBNET PRIOR (v=%u n=%u/%u/%u)\n",
173 preflist->version, preflist->ipv6_off, preflist->nr, preflist->max_prefs);
174
175 memset(&addr, 0, sizeof(addr));
176
177 for (i = 0; i < preflist->nr; i++) {
178 pref = &preflist->prefs[i];
179
180 addr.sin.sin_family = pref->family;
181 if (pref->family == AF_INET) {
182 memcpy(&addr.sin.sin_addr, &pref->ipv4_addr,
183 sizeof(addr.sin.sin_addr));
184 snprintf(buf, sizeof(buf), "%pISc/%u", &addr.sin, pref->subnet_mask);
185 seq_printf(m, "UDP %-43.43s %5u\n", buf, pref->prio);
186 } else {
187 memcpy(&addr.sin6.sin6_addr, &pref->ipv6_addr,
188 sizeof(addr.sin6.sin6_addr));
189 snprintf(buf, sizeof(buf), "%pISc/%u", &addr.sin6, pref->subnet_mask);
190 seq_printf(m, "UDP %-43.43s %5u\n", buf, pref->prio);
191 }
192 }
193
194out:
195 rcu_read_unlock();
196 return 0;
197}
198
199/*
200 * Display the name of the current workstation cell.
201 */
202static int afs_proc_rootcell_show(struct seq_file *m, void *v)
203{
204 struct afs_cell *cell;
205 struct afs_net *net;
206
207 net = afs_seq2net_single(m);
208 down_read(&net->cells_lock);
209 cell = net->ws_cell;
210 if (cell)
211 seq_printf(m, "%s\n", cell->name);
212 up_read(&net->cells_lock);
213 return 0;
214}
215
216/*
217 * Set the current workstation cell and optionally supply its list of volume
218 * location servers.
219 *
220 * echo "cell.name:192.168.231.14" >/proc/fs/afs/rootcell
221 */
222static int afs_proc_rootcell_write(struct file *file, char *buf, size_t size)
223{
224 struct seq_file *m = file->private_data;
225 struct afs_net *net = afs_seq2net_single(m);
226 char *s;
227 int ret;
228
229 ret = -EINVAL;
230 if (buf[0] == '.')
231 goto out;
232 if (memchr(buf, '/', size))
233 goto out;
234
235 /* trim to first NL */
236 s = memchr(buf, '\n', size);
237 if (s)
238 *s = 0;
239
240 /* determine command to perform */
241 _debug("rootcell=%s", buf);
242
243 ret = afs_cell_init(net, buf);
244
245out:
246 _leave(" = %d", ret);
247 return ret;
248}
249
250static const char afs_vol_types[3][3] = {
251 [AFSVL_RWVOL] = "RW",
252 [AFSVL_ROVOL] = "RO",
253 [AFSVL_BACKVOL] = "BK",
254};
255
256/*
257 * Display the list of volumes known to a cell.
258 */
259static int afs_proc_cell_volumes_show(struct seq_file *m, void *v)
260{
261 struct afs_volume *vol = hlist_entry(v, struct afs_volume, proc_link);
262
263 /* Display header on line 1 */
264 if (v == SEQ_START_TOKEN) {
265 seq_puts(m, "USE VID TY NAME\n");
266 return 0;
267 }
268
269 seq_printf(m, "%3d %08llx %s %s\n",
270 refcount_read(&vol->ref), vol->vid,
271 afs_vol_types[vol->type],
272 vol->name);
273
274 return 0;
275}
276
277static void *afs_proc_cell_volumes_start(struct seq_file *m, loff_t *_pos)
278 __acquires(cell->proc_lock)
279{
280 struct afs_cell *cell = pde_data(file_inode(m->file));
281
282 rcu_read_lock();
283 return seq_hlist_start_head_rcu(&cell->proc_volumes, *_pos);
284}
285
286static void *afs_proc_cell_volumes_next(struct seq_file *m, void *v,
287 loff_t *_pos)
288{
289 struct afs_cell *cell = pde_data(file_inode(m->file));
290
291 return seq_hlist_next_rcu(v, &cell->proc_volumes, _pos);
292}
293
294static void afs_proc_cell_volumes_stop(struct seq_file *m, void *v)
295 __releases(cell->proc_lock)
296{
297 rcu_read_unlock();
298}
299
300static const struct seq_operations afs_proc_cell_volumes_ops = {
301 .start = afs_proc_cell_volumes_start,
302 .next = afs_proc_cell_volumes_next,
303 .stop = afs_proc_cell_volumes_stop,
304 .show = afs_proc_cell_volumes_show,
305};
306
307static const char *const dns_record_sources[NR__dns_record_source + 1] = {
308 [DNS_RECORD_UNAVAILABLE] = "unav",
309 [DNS_RECORD_FROM_CONFIG] = "cfg",
310 [DNS_RECORD_FROM_DNS_A] = "A",
311 [DNS_RECORD_FROM_DNS_AFSDB] = "AFSDB",
312 [DNS_RECORD_FROM_DNS_SRV] = "SRV",
313 [DNS_RECORD_FROM_NSS] = "nss",
314 [NR__dns_record_source] = "[weird]"
315};
316
317static const char *const dns_lookup_statuses[NR__dns_lookup_status + 1] = {
318 [DNS_LOOKUP_NOT_DONE] = "no-lookup",
319 [DNS_LOOKUP_GOOD] = "good",
320 [DNS_LOOKUP_GOOD_WITH_BAD] = "good/bad",
321 [DNS_LOOKUP_BAD] = "bad",
322 [DNS_LOOKUP_GOT_NOT_FOUND] = "not-found",
323 [DNS_LOOKUP_GOT_LOCAL_FAILURE] = "local-failure",
324 [DNS_LOOKUP_GOT_TEMP_FAILURE] = "temp-failure",
325 [DNS_LOOKUP_GOT_NS_FAILURE] = "ns-failure",
326 [NR__dns_lookup_status] = "[weird]"
327};
328
329/*
330 * Display the list of Volume Location servers we're using for a cell.
331 */
332static int afs_proc_cell_vlservers_show(struct seq_file *m, void *v)
333{
334 const struct afs_vl_seq_net_private *priv = m->private;
335 const struct afs_vlserver_list *vllist = priv->vllist;
336 const struct afs_vlserver_entry *entry;
337 const struct afs_vlserver *vlserver;
338 const struct afs_addr_list *alist;
339 int i;
340
341 if (v == SEQ_START_TOKEN) {
342 seq_printf(m, "# source %s, status %s\n",
343 dns_record_sources[vllist ? vllist->source : 0],
344 dns_lookup_statuses[vllist ? vllist->status : 0]);
345 return 0;
346 }
347
348 entry = v;
349 vlserver = entry->server;
350 alist = rcu_dereference(vlserver->addresses);
351
352 seq_printf(m, "%s [p=%hu w=%hu s=%s,%s]:\n",
353 vlserver->name, entry->priority, entry->weight,
354 dns_record_sources[alist ? alist->source : entry->source],
355 dns_lookup_statuses[alist ? alist->status : entry->status]);
356 if (alist) {
357 for (i = 0; i < alist->nr_addrs; i++)
358 seq_printf(m, " %c %pISpc\n",
359 alist->preferred == i ? '>' : '-',
360 rxrpc_kernel_remote_addr(alist->addrs[i].peer));
361 }
362 seq_printf(m, " info: fl=%lx rtt=%d\n", vlserver->flags, vlserver->rtt);
363 seq_printf(m, " probe: fl=%x e=%d ac=%d out=%d\n",
364 vlserver->probe.flags, vlserver->probe.error,
365 vlserver->probe.abort_code,
366 atomic_read(&vlserver->probe_outstanding));
367 return 0;
368}
369
370static void *afs_proc_cell_vlservers_start(struct seq_file *m, loff_t *_pos)
371 __acquires(rcu)
372{
373 struct afs_vl_seq_net_private *priv = m->private;
374 struct afs_vlserver_list *vllist;
375 struct afs_cell *cell = pde_data(file_inode(m->file));
376 loff_t pos = *_pos;
377
378 rcu_read_lock();
379
380 vllist = rcu_dereference(cell->vl_servers);
381 priv->vllist = vllist;
382
383 if (pos < 0)
384 *_pos = pos = 0;
385 if (pos == 0)
386 return SEQ_START_TOKEN;
387
388 if (pos - 1 >= vllist->nr_servers)
389 return NULL;
390
391 return &vllist->servers[pos - 1];
392}
393
394static void *afs_proc_cell_vlservers_next(struct seq_file *m, void *v,
395 loff_t *_pos)
396{
397 struct afs_vl_seq_net_private *priv = m->private;
398 struct afs_vlserver_list *vllist = priv->vllist;
399 loff_t pos;
400
401 pos = *_pos;
402 pos++;
403 *_pos = pos;
404 if (!vllist || pos - 1 >= vllist->nr_servers)
405 return NULL;
406
407 return &vllist->servers[pos - 1];
408}
409
410static void afs_proc_cell_vlservers_stop(struct seq_file *m, void *v)
411 __releases(rcu)
412{
413 rcu_read_unlock();
414}
415
416static const struct seq_operations afs_proc_cell_vlservers_ops = {
417 .start = afs_proc_cell_vlservers_start,
418 .next = afs_proc_cell_vlservers_next,
419 .stop = afs_proc_cell_vlservers_stop,
420 .show = afs_proc_cell_vlservers_show,
421};
422
423/*
424 * Display the list of fileservers we're using within a namespace.
425 */
426static int afs_proc_servers_show(struct seq_file *m, void *v)
427{
428 struct afs_endpoint_state *estate;
429 struct afs_addr_list *alist;
430 struct afs_server *server;
431 unsigned long failed;
432 int i;
433
434 if (v == SEQ_START_TOKEN) {
435 seq_puts(m, "UUID REF ACT CELL\n");
436 return 0;
437 }
438
439 server = list_entry(v, struct afs_server, proc_link);
440 estate = rcu_dereference(server->endpoint_state);
441 alist = estate->addresses;
442 seq_printf(m, "%pU %3d %3d %s\n",
443 &server->uuid,
444 refcount_read(&server->ref),
445 atomic_read(&server->active),
446 server->cell->name);
447 seq_printf(m, " - info: fl=%lx rtt=%u\n",
448 server->flags, server->rtt);
449 seq_printf(m, " - probe: last=%d\n",
450 (int)(jiffies - server->probed_at) / HZ);
451 failed = estate->failed_set;
452 seq_printf(m, " - ESTATE pq=%x np=%u rsp=%lx f=%lx\n",
453 estate->probe_seq, atomic_read(&estate->nr_probing),
454 estate->responsive_set, estate->failed_set);
455 seq_printf(m, " - ALIST v=%u ap=%u\n",
456 alist->version, alist->addr_pref_version);
457 for (i = 0; i < alist->nr_addrs; i++) {
458 const struct afs_address *addr = &alist->addrs[i];
459
460 seq_printf(m, " [%x] %pISpc%s rtt=%d err=%d p=%u\n",
461 i, rxrpc_kernel_remote_addr(addr->peer),
462 alist->preferred == i ? "*" :
463 test_bit(i, &failed) ? "!" : "",
464 rxrpc_kernel_get_srtt(addr->peer),
465 addr->last_error, addr->prio);
466 }
467 return 0;
468}
469
470static void *afs_proc_servers_start(struct seq_file *m, loff_t *_pos)
471 __acquires(rcu)
472{
473 rcu_read_lock();
474 return seq_hlist_start_head_rcu(&afs_seq2net(m)->fs_proc, *_pos);
475}
476
477static void *afs_proc_servers_next(struct seq_file *m, void *v, loff_t *_pos)
478{
479 return seq_hlist_next_rcu(v, &afs_seq2net(m)->fs_proc, _pos);
480}
481
482static void afs_proc_servers_stop(struct seq_file *m, void *v)
483 __releases(rcu)
484{
485 rcu_read_unlock();
486}
487
488static const struct seq_operations afs_proc_servers_ops = {
489 .start = afs_proc_servers_start,
490 .next = afs_proc_servers_next,
491 .stop = afs_proc_servers_stop,
492 .show = afs_proc_servers_show,
493};
494
495/*
496 * Display the list of strings that may be substituted for the @sys pathname
497 * macro.
498 */
499static int afs_proc_sysname_show(struct seq_file *m, void *v)
500{
501 struct afs_net *net = afs_seq2net(m);
502 struct afs_sysnames *sysnames = net->sysnames;
503 unsigned int i = (unsigned long)v - 1;
504
505 if (i < sysnames->nr)
506 seq_printf(m, "%s\n", sysnames->subs[i]);
507 return 0;
508}
509
510static void *afs_proc_sysname_start(struct seq_file *m, loff_t *pos)
511 __acquires(&net->sysnames_lock)
512{
513 struct afs_net *net = afs_seq2net(m);
514 struct afs_sysnames *names;
515
516 read_lock(&net->sysnames_lock);
517
518 names = net->sysnames;
519 if (*pos >= names->nr)
520 return NULL;
521 return (void *)(unsigned long)(*pos + 1);
522}
523
524static void *afs_proc_sysname_next(struct seq_file *m, void *v, loff_t *pos)
525{
526 struct afs_net *net = afs_seq2net(m);
527 struct afs_sysnames *names = net->sysnames;
528
529 *pos += 1;
530 if (*pos >= names->nr)
531 return NULL;
532 return (void *)(unsigned long)(*pos + 1);
533}
534
535static void afs_proc_sysname_stop(struct seq_file *m, void *v)
536 __releases(&net->sysnames_lock)
537{
538 struct afs_net *net = afs_seq2net(m);
539
540 read_unlock(&net->sysnames_lock);
541}
542
543static const struct seq_operations afs_proc_sysname_ops = {
544 .start = afs_proc_sysname_start,
545 .next = afs_proc_sysname_next,
546 .stop = afs_proc_sysname_stop,
547 .show = afs_proc_sysname_show,
548};
549
550/*
551 * Allow the @sys substitution to be configured.
552 */
553static int afs_proc_sysname_write(struct file *file, char *buf, size_t size)
554{
555 struct afs_sysnames *sysnames, *kill;
556 struct seq_file *m = file->private_data;
557 struct afs_net *net = afs_seq2net(m);
558 char *s, *p, *sub;
559 int ret, len;
560
561 sysnames = kzalloc(sizeof(*sysnames), GFP_KERNEL);
562 if (!sysnames)
563 return -ENOMEM;
564 refcount_set(&sysnames->usage, 1);
565 kill = sysnames;
566
567 p = buf;
568 while ((s = strsep(&p, " \t\n"))) {
569 len = strlen(s);
570 if (len == 0)
571 continue;
572 ret = -ENAMETOOLONG;
573 if (len >= AFSNAMEMAX)
574 goto error;
575
576 if (len >= 4 &&
577 s[len - 4] == '@' &&
578 s[len - 3] == 's' &&
579 s[len - 2] == 'y' &&
580 s[len - 1] == 's')
581 /* Protect against recursion */
582 goto invalid;
583
584 if (s[0] == '.' &&
585 (len < 2 || (len == 2 && s[1] == '.')))
586 goto invalid;
587
588 if (memchr(s, '/', len))
589 goto invalid;
590
591 ret = -EFBIG;
592 if (sysnames->nr >= AFS_NR_SYSNAME)
593 goto out;
594
595 if (strcmp(s, afs_init_sysname) == 0) {
596 sub = (char *)afs_init_sysname;
597 } else {
598 ret = -ENOMEM;
599 sub = kmemdup(s, len + 1, GFP_KERNEL);
600 if (!sub)
601 goto out;
602 }
603
604 sysnames->subs[sysnames->nr] = sub;
605 sysnames->nr++;
606 }
607
608 if (sysnames->nr == 0) {
609 sysnames->subs[0] = sysnames->blank;
610 sysnames->nr++;
611 }
612
613 write_lock(&net->sysnames_lock);
614 kill = net->sysnames;
615 net->sysnames = sysnames;
616 write_unlock(&net->sysnames_lock);
617 ret = 0;
618out:
619 afs_put_sysnames(kill);
620 return ret;
621
622invalid:
623 ret = -EINVAL;
624error:
625 goto out;
626}
627
628void afs_put_sysnames(struct afs_sysnames *sysnames)
629{
630 int i;
631
632 if (sysnames && refcount_dec_and_test(&sysnames->usage)) {
633 for (i = 0; i < sysnames->nr; i++)
634 if (sysnames->subs[i] != afs_init_sysname &&
635 sysnames->subs[i] != sysnames->blank)
636 kfree(sysnames->subs[i]);
637 kfree(sysnames);
638 }
639}
640
641/*
642 * Display general per-net namespace statistics
643 */
644static int afs_proc_stats_show(struct seq_file *m, void *v)
645{
646 struct afs_net *net = afs_seq2net_single(m);
647
648 seq_puts(m, "kAFS statistics\n");
649
650 seq_printf(m, "dir-mgmt: look=%u reval=%u inval=%u relpg=%u\n",
651 atomic_read(&net->n_lookup),
652 atomic_read(&net->n_reval),
653 atomic_read(&net->n_inval),
654 atomic_read(&net->n_relpg));
655
656 seq_printf(m, "dir-data: rdpg=%u\n",
657 atomic_read(&net->n_read_dir));
658
659 seq_printf(m, "dir-edit: cr=%u rm=%u\n",
660 atomic_read(&net->n_dir_cr),
661 atomic_read(&net->n_dir_rm));
662
663 seq_printf(m, "file-rd : n=%u nb=%lu\n",
664 atomic_read(&net->n_fetches),
665 atomic_long_read(&net->n_fetch_bytes));
666 seq_printf(m, "file-wr : n=%u nb=%lu\n",
667 atomic_read(&net->n_stores),
668 atomic_long_read(&net->n_store_bytes));
669 return 0;
670}
671
672/*
673 * initialise /proc/fs/afs/<cell>/
674 */
675int afs_proc_cell_setup(struct afs_cell *cell)
676{
677 struct proc_dir_entry *dir;
678 struct afs_net *net = cell->net;
679
680 _enter("%p{%s},%p", cell, cell->name, net->proc_afs);
681
682 dir = proc_net_mkdir(net->net, cell->name, net->proc_afs);
683 if (!dir)
684 goto error_dir;
685
686 if (!proc_create_net_data("vlservers", 0444, dir,
687 &afs_proc_cell_vlservers_ops,
688 sizeof(struct afs_vl_seq_net_private),
689 cell) ||
690 !proc_create_net_data("volumes", 0444, dir,
691 &afs_proc_cell_volumes_ops,
692 sizeof(struct seq_net_private),
693 cell))
694 goto error_tree;
695
696 _leave(" = 0");
697 return 0;
698
699error_tree:
700 remove_proc_subtree(cell->name, net->proc_afs);
701error_dir:
702 _leave(" = -ENOMEM");
703 return -ENOMEM;
704}
705
706/*
707 * remove /proc/fs/afs/<cell>/
708 */
709void afs_proc_cell_remove(struct afs_cell *cell)
710{
711 struct afs_net *net = cell->net;
712
713 _enter("");
714 remove_proc_subtree(cell->name, net->proc_afs);
715 _leave("");
716}
717
718/*
719 * initialise the /proc/fs/afs/ directory
720 */
721int afs_proc_init(struct afs_net *net)
722{
723 struct proc_dir_entry *p;
724
725 _enter("");
726
727 p = proc_net_mkdir(net->net, "afs", net->net->proc_net);
728 if (!p)
729 goto error_dir;
730
731 if (!proc_create_net_data_write("cells", 0644, p,
732 &afs_proc_cells_ops,
733 afs_proc_cells_write,
734 sizeof(struct seq_net_private),
735 NULL) ||
736 !proc_create_net_single_write("rootcell", 0644, p,
737 afs_proc_rootcell_show,
738 afs_proc_rootcell_write,
739 NULL) ||
740 !proc_create_net("servers", 0444, p, &afs_proc_servers_ops,
741 sizeof(struct seq_net_private)) ||
742 !proc_create_net_single("stats", 0444, p, afs_proc_stats_show, NULL) ||
743 !proc_create_net_data_write("sysname", 0644, p,
744 &afs_proc_sysname_ops,
745 afs_proc_sysname_write,
746 sizeof(struct seq_net_private),
747 NULL) ||
748 !proc_create_net_single_write("addr_prefs", 0644, p,
749 afs_proc_addr_prefs_show,
750 afs_proc_addr_prefs_write,
751 NULL))
752 goto error_tree;
753
754 net->proc_afs = p;
755 _leave(" = 0");
756 return 0;
757
758error_tree:
759 proc_remove(p);
760error_dir:
761 _leave(" = -ENOMEM");
762 return -ENOMEM;
763}
764
765/*
766 * clean up the /proc/fs/afs/ directory
767 */
768void afs_proc_cleanup(struct afs_net *net)
769{
770 proc_remove(net->proc_afs);
771 net->proc_afs = NULL;
772}