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TOMOYO Linux Cross Reference
Linux/net/sctp/proc.c

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  1 /* SCTP kernel implementation
  2  * Copyright (c) 2003 International Business Machines, Corp.
  3  *
  4  * This file is part of the SCTP kernel implementation
  5  *
  6  * This SCTP implementation is free software;
  7  * you can redistribute it and/or modify it under the terms of
  8  * the GNU General Public License as published by
  9  * the Free Software Foundation; either version 2, or (at your option)
 10  * any later version.
 11  *
 12  * This SCTP implementation is distributed in the hope that it
 13  * will be useful, but WITHOUT ANY WARRANTY; without even the implied
 14  *                 ************************
 15  * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 16  * See the GNU General Public License for more details.
 17  *
 18  * You should have received a copy of the GNU General Public License
 19  * along with GNU CC; see the file COPYING.  If not, see
 20  * <http://www.gnu.org/licenses/>.
 21  *
 22  * Please send any bug reports or fixes you make to the
 23  * email address(es):
 24  *    lksctp developers <linux-sctp@vger.kernel.org>
 25  *
 26  * Written or modified by:
 27  *    Sridhar Samudrala <sri@us.ibm.com>
 28  */
 29 
 30 #include <linux/types.h>
 31 #include <linux/seq_file.h>
 32 #include <linux/init.h>
 33 #include <linux/export.h>
 34 #include <net/sctp/sctp.h>
 35 #include <net/ip.h> /* for snmp_fold_field */
 36 
 37 static const struct snmp_mib sctp_snmp_list[] = {
 38         SNMP_MIB_ITEM("SctpCurrEstab", SCTP_MIB_CURRESTAB),
 39         SNMP_MIB_ITEM("SctpActiveEstabs", SCTP_MIB_ACTIVEESTABS),
 40         SNMP_MIB_ITEM("SctpPassiveEstabs", SCTP_MIB_PASSIVEESTABS),
 41         SNMP_MIB_ITEM("SctpAborteds", SCTP_MIB_ABORTEDS),
 42         SNMP_MIB_ITEM("SctpShutdowns", SCTP_MIB_SHUTDOWNS),
 43         SNMP_MIB_ITEM("SctpOutOfBlues", SCTP_MIB_OUTOFBLUES),
 44         SNMP_MIB_ITEM("SctpChecksumErrors", SCTP_MIB_CHECKSUMERRORS),
 45         SNMP_MIB_ITEM("SctpOutCtrlChunks", SCTP_MIB_OUTCTRLCHUNKS),
 46         SNMP_MIB_ITEM("SctpOutOrderChunks", SCTP_MIB_OUTORDERCHUNKS),
 47         SNMP_MIB_ITEM("SctpOutUnorderChunks", SCTP_MIB_OUTUNORDERCHUNKS),
 48         SNMP_MIB_ITEM("SctpInCtrlChunks", SCTP_MIB_INCTRLCHUNKS),
 49         SNMP_MIB_ITEM("SctpInOrderChunks", SCTP_MIB_INORDERCHUNKS),
 50         SNMP_MIB_ITEM("SctpInUnorderChunks", SCTP_MIB_INUNORDERCHUNKS),
 51         SNMP_MIB_ITEM("SctpFragUsrMsgs", SCTP_MIB_FRAGUSRMSGS),
 52         SNMP_MIB_ITEM("SctpReasmUsrMsgs", SCTP_MIB_REASMUSRMSGS),
 53         SNMP_MIB_ITEM("SctpOutSCTPPacks", SCTP_MIB_OUTSCTPPACKS),
 54         SNMP_MIB_ITEM("SctpInSCTPPacks", SCTP_MIB_INSCTPPACKS),
 55         SNMP_MIB_ITEM("SctpT1InitExpireds", SCTP_MIB_T1_INIT_EXPIREDS),
 56         SNMP_MIB_ITEM("SctpT1CookieExpireds", SCTP_MIB_T1_COOKIE_EXPIREDS),
 57         SNMP_MIB_ITEM("SctpT2ShutdownExpireds", SCTP_MIB_T2_SHUTDOWN_EXPIREDS),
 58         SNMP_MIB_ITEM("SctpT3RtxExpireds", SCTP_MIB_T3_RTX_EXPIREDS),
 59         SNMP_MIB_ITEM("SctpT4RtoExpireds", SCTP_MIB_T4_RTO_EXPIREDS),
 60         SNMP_MIB_ITEM("SctpT5ShutdownGuardExpireds", SCTP_MIB_T5_SHUTDOWN_GUARD_EXPIREDS),
 61         SNMP_MIB_ITEM("SctpDelaySackExpireds", SCTP_MIB_DELAY_SACK_EXPIREDS),
 62         SNMP_MIB_ITEM("SctpAutocloseExpireds", SCTP_MIB_AUTOCLOSE_EXPIREDS),
 63         SNMP_MIB_ITEM("SctpT3Retransmits", SCTP_MIB_T3_RETRANSMITS),
 64         SNMP_MIB_ITEM("SctpPmtudRetransmits", SCTP_MIB_PMTUD_RETRANSMITS),
 65         SNMP_MIB_ITEM("SctpFastRetransmits", SCTP_MIB_FAST_RETRANSMITS),
 66         SNMP_MIB_ITEM("SctpInPktSoftirq", SCTP_MIB_IN_PKT_SOFTIRQ),
 67         SNMP_MIB_ITEM("SctpInPktBacklog", SCTP_MIB_IN_PKT_BACKLOG),
 68         SNMP_MIB_ITEM("SctpInPktDiscards", SCTP_MIB_IN_PKT_DISCARDS),
 69         SNMP_MIB_ITEM("SctpInDataChunkDiscards", SCTP_MIB_IN_DATA_CHUNK_DISCARDS),
 70         SNMP_MIB_SENTINEL
 71 };
 72 
 73 /* Display sctp snmp mib statistics(/proc/net/sctp/snmp). */
 74 static int sctp_snmp_seq_show(struct seq_file *seq, void *v)
 75 {
 76         struct net *net = seq->private;
 77         int i;
 78 
 79         for (i = 0; sctp_snmp_list[i].name != NULL; i++)
 80                 seq_printf(seq, "%-32s\t%ld\n", sctp_snmp_list[i].name,
 81                            snmp_fold_field(net->sctp.sctp_statistics,
 82                                       sctp_snmp_list[i].entry));
 83 
 84         return 0;
 85 }
 86 
 87 /* Initialize the seq file operations for 'snmp' object. */
 88 static int sctp_snmp_seq_open(struct inode *inode, struct file *file)
 89 {
 90         return single_open_net(inode, file, sctp_snmp_seq_show);
 91 }
 92 
 93 static const struct file_operations sctp_snmp_seq_fops = {
 94         .owner   = THIS_MODULE,
 95         .open    = sctp_snmp_seq_open,
 96         .read    = seq_read,
 97         .llseek  = seq_lseek,
 98         .release = single_release_net,
 99 };
100 
101 /* Set up the proc fs entry for 'snmp' object. */
102 int __net_init sctp_snmp_proc_init(struct net *net)
103 {
104         struct proc_dir_entry *p;
105 
106         p = proc_create("snmp", S_IRUGO, net->sctp.proc_net_sctp,
107                         &sctp_snmp_seq_fops);
108         if (!p)
109                 return -ENOMEM;
110 
111         return 0;
112 }
113 
114 /* Cleanup the proc fs entry for 'snmp' object. */
115 void sctp_snmp_proc_exit(struct net *net)
116 {
117         remove_proc_entry("snmp", net->sctp.proc_net_sctp);
118 }
119 
120 /* Dump local addresses of an association/endpoint. */
121 static void sctp_seq_dump_local_addrs(struct seq_file *seq, struct sctp_ep_common *epb)
122 {
123         struct sctp_association *asoc;
124         struct sctp_sockaddr_entry *laddr;
125         struct sctp_transport *peer;
126         union sctp_addr *addr, *primary = NULL;
127         struct sctp_af *af;
128 
129         if (epb->type == SCTP_EP_TYPE_ASSOCIATION) {
130                 asoc = sctp_assoc(epb);
131 
132                 peer = asoc->peer.primary_path;
133                 if (unlikely(peer == NULL)) {
134                         WARN(1, "Association %p with NULL primary path!\n", asoc);
135                         return;
136                 }
137 
138                 primary = &peer->saddr;
139         }
140 
141         rcu_read_lock();
142         list_for_each_entry_rcu(laddr, &epb->bind_addr.address_list, list) {
143                 if (!laddr->valid)
144                         continue;
145 
146                 addr = &laddr->a;
147                 af = sctp_get_af_specific(addr->sa.sa_family);
148                 if (primary && af->cmp_addr(addr, primary)) {
149                         seq_printf(seq, "*");
150                 }
151                 af->seq_dump_addr(seq, addr);
152         }
153         rcu_read_unlock();
154 }
155 
156 /* Dump remote addresses of an association. */
157 static void sctp_seq_dump_remote_addrs(struct seq_file *seq, struct sctp_association *assoc)
158 {
159         struct sctp_transport *transport;
160         union sctp_addr *addr, *primary;
161         struct sctp_af *af;
162 
163         primary = &assoc->peer.primary_addr;
164         list_for_each_entry_rcu(transport, &assoc->peer.transport_addr_list,
165                         transports) {
166                 addr = &transport->ipaddr;
167 
168                 af = sctp_get_af_specific(addr->sa.sa_family);
169                 if (af->cmp_addr(addr, primary)) {
170                         seq_printf(seq, "*");
171                 }
172                 af->seq_dump_addr(seq, addr);
173         }
174 }
175 
176 static void *sctp_eps_seq_start(struct seq_file *seq, loff_t *pos)
177 {
178         if (*pos >= sctp_ep_hashsize)
179                 return NULL;
180 
181         if (*pos < 0)
182                 *pos = 0;
183 
184         if (*pos == 0)
185                 seq_printf(seq, " ENDPT     SOCK   STY SST HBKT LPORT   UID INODE LADDRS\n");
186 
187         return (void *)pos;
188 }
189 
190 static void sctp_eps_seq_stop(struct seq_file *seq, void *v)
191 {
192 }
193 
194 
195 static void *sctp_eps_seq_next(struct seq_file *seq, void *v, loff_t *pos)
196 {
197         if (++*pos >= sctp_ep_hashsize)
198                 return NULL;
199 
200         return pos;
201 }
202 
203 
204 /* Display sctp endpoints (/proc/net/sctp/eps). */
205 static int sctp_eps_seq_show(struct seq_file *seq, void *v)
206 {
207         struct sctp_hashbucket *head;
208         struct sctp_ep_common *epb;
209         struct sctp_endpoint *ep;
210         struct sock *sk;
211         int    hash = *(loff_t *)v;
212 
213         if (hash >= sctp_ep_hashsize)
214                 return -ENOMEM;
215 
216         head = &sctp_ep_hashtable[hash];
217         local_bh_disable();
218         read_lock(&head->lock);
219         sctp_for_each_hentry(epb, &head->chain) {
220                 ep = sctp_ep(epb);
221                 sk = epb->sk;
222                 if (!net_eq(sock_net(sk), seq_file_net(seq)))
223                         continue;
224                 seq_printf(seq, "%8pK %8pK %-3d %-3d %-4d %-5d %5u %5lu ", ep, sk,
225                            sctp_sk(sk)->type, sk->sk_state, hash,
226                            epb->bind_addr.port,
227                            from_kuid_munged(seq_user_ns(seq), sock_i_uid(sk)),
228                            sock_i_ino(sk));
229 
230                 sctp_seq_dump_local_addrs(seq, epb);
231                 seq_printf(seq, "\n");
232         }
233         read_unlock(&head->lock);
234         local_bh_enable();
235 
236         return 0;
237 }
238 
239 static const struct seq_operations sctp_eps_ops = {
240         .start = sctp_eps_seq_start,
241         .next  = sctp_eps_seq_next,
242         .stop  = sctp_eps_seq_stop,
243         .show  = sctp_eps_seq_show,
244 };
245 
246 
247 /* Initialize the seq file operations for 'eps' object. */
248 static int sctp_eps_seq_open(struct inode *inode, struct file *file)
249 {
250         return seq_open_net(inode, file, &sctp_eps_ops,
251                             sizeof(struct seq_net_private));
252 }
253 
254 static const struct file_operations sctp_eps_seq_fops = {
255         .open    = sctp_eps_seq_open,
256         .read    = seq_read,
257         .llseek  = seq_lseek,
258         .release = seq_release_net,
259 };
260 
261 /* Set up the proc fs entry for 'eps' object. */
262 int __net_init sctp_eps_proc_init(struct net *net)
263 {
264         struct proc_dir_entry *p;
265 
266         p = proc_create("eps", S_IRUGO, net->sctp.proc_net_sctp,
267                         &sctp_eps_seq_fops);
268         if (!p)
269                 return -ENOMEM;
270 
271         return 0;
272 }
273 
274 /* Cleanup the proc fs entry for 'eps' object. */
275 void sctp_eps_proc_exit(struct net *net)
276 {
277         remove_proc_entry("eps", net->sctp.proc_net_sctp);
278 }
279 
280 struct sctp_ht_iter {
281         struct seq_net_private p;
282         struct rhashtable_iter hti;
283 };
284 
285 static struct sctp_transport *sctp_transport_get_next(struct seq_file *seq)
286 {
287         struct sctp_ht_iter *iter = seq->private;
288         struct sctp_transport *t;
289 
290         t = rhashtable_walk_next(&iter->hti);
291         for (; t; t = rhashtable_walk_next(&iter->hti)) {
292                 if (IS_ERR(t)) {
293                         if (PTR_ERR(t) == -EAGAIN)
294                                 continue;
295                         break;
296                 }
297 
298                 if (net_eq(sock_net(t->asoc->base.sk), seq_file_net(seq)) &&
299                     t->asoc->peer.primary_path == t)
300                         break;
301         }
302 
303         return t;
304 }
305 
306 static struct sctp_transport *sctp_transport_get_idx(struct seq_file *seq,
307                                                      loff_t pos)
308 {
309         void *obj = SEQ_START_TOKEN;
310 
311         while (pos && (obj = sctp_transport_get_next(seq)) && !IS_ERR(obj))
312                 pos--;
313 
314         return obj;
315 }
316 
317 static int sctp_transport_walk_start(struct seq_file *seq)
318 {
319         struct sctp_ht_iter *iter = seq->private;
320         int err;
321 
322         err = rhashtable_walk_init(&sctp_transport_hashtable, &iter->hti);
323         if (err)
324                 return err;
325 
326         err = rhashtable_walk_start(&iter->hti);
327 
328         return err == -EAGAIN ? 0 : err;
329 }
330 
331 static void sctp_transport_walk_stop(struct seq_file *seq)
332 {
333         struct sctp_ht_iter *iter = seq->private;
334 
335         rhashtable_walk_stop(&iter->hti);
336         rhashtable_walk_exit(&iter->hti);
337 }
338 
339 static void *sctp_assocs_seq_start(struct seq_file *seq, loff_t *pos)
340 {
341         int err = sctp_transport_walk_start(seq);
342 
343         if (err)
344                 return ERR_PTR(err);
345 
346         return sctp_transport_get_idx(seq, *pos);
347 }
348 
349 static void sctp_assocs_seq_stop(struct seq_file *seq, void *v)
350 {
351         sctp_transport_walk_stop(seq);
352 }
353 
354 static void *sctp_assocs_seq_next(struct seq_file *seq, void *v, loff_t *pos)
355 {
356         ++*pos;
357 
358         return sctp_transport_get_next(seq);
359 }
360 
361 /* Display sctp associations (/proc/net/sctp/assocs). */
362 static int sctp_assocs_seq_show(struct seq_file *seq, void *v)
363 {
364         struct sctp_transport *transport;
365         struct sctp_association *assoc;
366         struct sctp_ep_common *epb;
367         struct sock *sk;
368 
369         if (v == SEQ_START_TOKEN) {
370                 seq_printf(seq, " ASSOC     SOCK   STY SST ST HBKT "
371                                 "ASSOC-ID TX_QUEUE RX_QUEUE UID INODE LPORT "
372                                 "RPORT LADDRS <-> RADDRS "
373                                 "HBINT INS OUTS MAXRT T1X T2X RTXC "
374                                 "wmema wmemq sndbuf rcvbuf\n");
375                 return 0;
376         }
377 
378         transport = (struct sctp_transport *)v;
379         if (!sctp_transport_hold(transport))
380                 return 0;
381         assoc = transport->asoc;
382         epb = &assoc->base;
383         sk = epb->sk;
384 
385         seq_printf(seq,
386                    "%8pK %8pK %-3d %-3d %-2d %-4d "
387                    "%4d %8d %8d %7u %5lu %-5d %5d ",
388                    assoc, sk, sctp_sk(sk)->type, sk->sk_state,
389                    assoc->state, 0,
390                    assoc->assoc_id,
391                    assoc->sndbuf_used,
392                    atomic_read(&assoc->rmem_alloc),
393                    from_kuid_munged(seq_user_ns(seq), sock_i_uid(sk)),
394                    sock_i_ino(sk),
395                    epb->bind_addr.port,
396                    assoc->peer.port);
397         seq_printf(seq, " ");
398         sctp_seq_dump_local_addrs(seq, epb);
399         seq_printf(seq, "<-> ");
400         sctp_seq_dump_remote_addrs(seq, assoc);
401         seq_printf(seq, "\t%8lu %5d %5d %4d %4d %4d %8d "
402                    "%8d %8d %8d %8d",
403                 assoc->hbinterval, assoc->c.sinit_max_instreams,
404                 assoc->c.sinit_num_ostreams, assoc->max_retrans,
405                 assoc->init_retries, assoc->shutdown_retries,
406                 assoc->rtx_data_chunks,
407                 atomic_read(&sk->sk_wmem_alloc),
408                 sk->sk_wmem_queued,
409                 sk->sk_sndbuf,
410                 sk->sk_rcvbuf);
411         seq_printf(seq, "\n");
412 
413         sctp_transport_put(transport);
414 
415         return 0;
416 }
417 
418 static const struct seq_operations sctp_assoc_ops = {
419         .start = sctp_assocs_seq_start,
420         .next  = sctp_assocs_seq_next,
421         .stop  = sctp_assocs_seq_stop,
422         .show  = sctp_assocs_seq_show,
423 };
424 
425 /* Initialize the seq file operations for 'assocs' object. */
426 static int sctp_assocs_seq_open(struct inode *inode, struct file *file)
427 {
428         return seq_open_net(inode, file, &sctp_assoc_ops,
429                             sizeof(struct sctp_ht_iter));
430 }
431 
432 static const struct file_operations sctp_assocs_seq_fops = {
433         .open    = sctp_assocs_seq_open,
434         .read    = seq_read,
435         .llseek  = seq_lseek,
436         .release = seq_release_net,
437 };
438 
439 /* Set up the proc fs entry for 'assocs' object. */
440 int __net_init sctp_assocs_proc_init(struct net *net)
441 {
442         struct proc_dir_entry *p;
443 
444         p = proc_create("assocs", S_IRUGO, net->sctp.proc_net_sctp,
445                         &sctp_assocs_seq_fops);
446         if (!p)
447                 return -ENOMEM;
448 
449         return 0;
450 }
451 
452 /* Cleanup the proc fs entry for 'assocs' object. */
453 void sctp_assocs_proc_exit(struct net *net)
454 {
455         remove_proc_entry("assocs", net->sctp.proc_net_sctp);
456 }
457 
458 static void *sctp_remaddr_seq_start(struct seq_file *seq, loff_t *pos)
459 {
460         int err = sctp_transport_walk_start(seq);
461 
462         if (err)
463                 return ERR_PTR(err);
464 
465         return sctp_transport_get_idx(seq, *pos);
466 }
467 
468 static void *sctp_remaddr_seq_next(struct seq_file *seq, void *v, loff_t *pos)
469 {
470         ++*pos;
471 
472         return sctp_transport_get_next(seq);
473 }
474 
475 static void sctp_remaddr_seq_stop(struct seq_file *seq, void *v)
476 {
477         sctp_transport_walk_stop(seq);
478 }
479 
480 static int sctp_remaddr_seq_show(struct seq_file *seq, void *v)
481 {
482         struct sctp_association *assoc;
483         struct sctp_transport *transport, *tsp;
484 
485         if (v == SEQ_START_TOKEN) {
486                 seq_printf(seq, "ADDR ASSOC_ID HB_ACT RTO MAX_PATH_RTX "
487                                 "REM_ADDR_RTX START STATE\n");
488                 return 0;
489         }
490 
491         transport = (struct sctp_transport *)v;
492         if (!sctp_transport_hold(transport))
493                 return 0;
494         assoc = transport->asoc;
495 
496         list_for_each_entry_rcu(tsp, &assoc->peer.transport_addr_list,
497                                 transports) {
498                 /*
499                  * The remote address (ADDR)
500                  */
501                 tsp->af_specific->seq_dump_addr(seq, &tsp->ipaddr);
502                 seq_printf(seq, " ");
503                 /*
504                  * The association ID (ASSOC_ID)
505                  */
506                 seq_printf(seq, "%d ", tsp->asoc->assoc_id);
507 
508                 /*
509                  * If the Heartbeat is active (HB_ACT)
510                  * Note: 1 = Active, 0 = Inactive
511                  */
512                 seq_printf(seq, "%d ", timer_pending(&tsp->hb_timer));
513 
514                 /*
515                  * Retransmit time out (RTO)
516                  */
517                 seq_printf(seq, "%lu ", tsp->rto);
518 
519                 /*
520                  * Maximum path retransmit count (PATH_MAX_RTX)
521                  */
522                 seq_printf(seq, "%d ", tsp->pathmaxrxt);
523 
524                 /*
525                  * remote address retransmit count (REM_ADDR_RTX)
526                  * Note: We don't have a way to tally this at the moment
527                  * so lets just leave it as zero for the moment
528                  */
529                 seq_puts(seq, "0 ");
530 
531                 /*
532                  * remote address start time (START).  This is also not
533                  * currently implemented, but we can record it with a
534                  * jiffies marker in a subsequent patch
535                  */
536                 seq_puts(seq, "0 ");
537 
538                 /*
539                  * The current state of this destination. I.e.
540                  * SCTP_ACTIVE, SCTP_INACTIVE, ...
541                  */
542                 seq_printf(seq, "%d", tsp->state);
543 
544                 seq_printf(seq, "\n");
545         }
546 
547         sctp_transport_put(transport);
548 
549         return 0;
550 }
551 
552 static const struct seq_operations sctp_remaddr_ops = {
553         .start = sctp_remaddr_seq_start,
554         .next  = sctp_remaddr_seq_next,
555         .stop  = sctp_remaddr_seq_stop,
556         .show  = sctp_remaddr_seq_show,
557 };
558 
559 /* Cleanup the proc fs entry for 'remaddr' object. */
560 void sctp_remaddr_proc_exit(struct net *net)
561 {
562         remove_proc_entry("remaddr", net->sctp.proc_net_sctp);
563 }
564 
565 static int sctp_remaddr_seq_open(struct inode *inode, struct file *file)
566 {
567         return seq_open_net(inode, file, &sctp_remaddr_ops,
568                             sizeof(struct sctp_ht_iter));
569 }
570 
571 static const struct file_operations sctp_remaddr_seq_fops = {
572         .open = sctp_remaddr_seq_open,
573         .read = seq_read,
574         .llseek = seq_lseek,
575         .release = seq_release_net,
576 };
577 
578 int __net_init sctp_remaddr_proc_init(struct net *net)
579 {
580         struct proc_dir_entry *p;
581 
582         p = proc_create("remaddr", S_IRUGO, net->sctp.proc_net_sctp,
583                         &sctp_remaddr_seq_fops);
584         if (!p)
585                 return -ENOMEM;
586         return 0;
587 }
588 

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