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1// SPDX-License-Identifier: GPL-2.0-or-later2/* /proc interface for AFS3 *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/cells86 * - 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 volume218 * location servers.219 *220 * echo "cell.name:192.168.231.14" >/proc/fs/afs/rootcell221 */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 pathname497 * 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 statistics643 */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/ directory720 */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/ directory767 */768void afs_proc_cleanup(struct afs_net *net)769{770 proc_remove(net->proc_afs);771 net->proc_afs = NULL;772}773