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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         rcu_read_lock();
165         list_for_each_entry_rcu(transport, &assoc->peer.transport_addr_list,
166                         transports) {
167                 addr = &transport->ipaddr;
168 
169                 af = sctp_get_af_specific(addr->sa.sa_family);
170                 if (af->cmp_addr(addr, primary)) {
171                         seq_printf(seq, "*");
172                 }
173                 af->seq_dump_addr(seq, addr);
174         }
175         rcu_read_unlock();
176 }
177 
178 static void *sctp_eps_seq_start(struct seq_file *seq, loff_t *pos)
179 {
180         if (*pos >= sctp_ep_hashsize)
181                 return NULL;
182 
183         if (*pos < 0)
184                 *pos = 0;
185 
186         if (*pos == 0)
187                 seq_printf(seq, " ENDPT     SOCK   STY SST HBKT LPORT   UID INODE LADDRS\n");
188 
189         return (void *)pos;
190 }
191 
192 static void sctp_eps_seq_stop(struct seq_file *seq, void *v)
193 {
194 }
195 
196 
197 static void *sctp_eps_seq_next(struct seq_file *seq, void *v, loff_t *pos)
198 {
199         if (++*pos >= sctp_ep_hashsize)
200                 return NULL;
201 
202         return pos;
203 }
204 
205 
206 /* Display sctp endpoints (/proc/net/sctp/eps). */
207 static int sctp_eps_seq_show(struct seq_file *seq, void *v)
208 {
209         struct sctp_hashbucket *head;
210         struct sctp_ep_common *epb;
211         struct sctp_endpoint *ep;
212         struct sock *sk;
213         int    hash = *(loff_t *)v;
214 
215         if (hash >= sctp_ep_hashsize)
216                 return -ENOMEM;
217 
218         head = &sctp_ep_hashtable[hash];
219         local_bh_disable();
220         read_lock(&head->lock);
221         sctp_for_each_hentry(epb, &head->chain) {
222                 ep = sctp_ep(epb);
223                 sk = epb->sk;
224                 if (!net_eq(sock_net(sk), seq_file_net(seq)))
225                         continue;
226                 seq_printf(seq, "%8pK %8pK %-3d %-3d %-4d %-5d %5u %5lu ", ep, sk,
227                            sctp_sk(sk)->type, sk->sk_state, hash,
228                            epb->bind_addr.port,
229                            from_kuid_munged(seq_user_ns(seq), sock_i_uid(sk)),
230                            sock_i_ino(sk));
231 
232                 sctp_seq_dump_local_addrs(seq, epb);
233                 seq_printf(seq, "\n");
234         }
235         read_unlock(&head->lock);
236         local_bh_enable();
237 
238         return 0;
239 }
240 
241 static const struct seq_operations sctp_eps_ops = {
242         .start = sctp_eps_seq_start,
243         .next  = sctp_eps_seq_next,
244         .stop  = sctp_eps_seq_stop,
245         .show  = sctp_eps_seq_show,
246 };
247 
248 
249 /* Initialize the seq file operations for 'eps' object. */
250 static int sctp_eps_seq_open(struct inode *inode, struct file *file)
251 {
252         return seq_open_net(inode, file, &sctp_eps_ops,
253                             sizeof(struct seq_net_private));
254 }
255 
256 static const struct file_operations sctp_eps_seq_fops = {
257         .open    = sctp_eps_seq_open,
258         .read    = seq_read,
259         .llseek  = seq_lseek,
260         .release = seq_release_net,
261 };
262 
263 /* Set up the proc fs entry for 'eps' object. */
264 int __net_init sctp_eps_proc_init(struct net *net)
265 {
266         struct proc_dir_entry *p;
267 
268         p = proc_create("eps", S_IRUGO, net->sctp.proc_net_sctp,
269                         &sctp_eps_seq_fops);
270         if (!p)
271                 return -ENOMEM;
272 
273         return 0;
274 }
275 
276 /* Cleanup the proc fs entry for 'eps' object. */
277 void sctp_eps_proc_exit(struct net *net)
278 {
279         remove_proc_entry("eps", net->sctp.proc_net_sctp);
280 }
281 
282 struct sctp_ht_iter {
283         struct seq_net_private p;
284         struct rhashtable_iter hti;
285 };
286 
287 static struct sctp_transport *sctp_transport_get_next(struct seq_file *seq)
288 {
289         struct sctp_ht_iter *iter = seq->private;
290         struct sctp_transport *t;
291 
292         t = rhashtable_walk_next(&iter->hti);
293         for (; t; t = rhashtable_walk_next(&iter->hti)) {
294                 if (IS_ERR(t)) {
295                         if (PTR_ERR(t) == -EAGAIN)
296                                 continue;
297                         break;
298                 }
299 
300                 if (net_eq(sock_net(t->asoc->base.sk), seq_file_net(seq)) &&
301                     t->asoc->peer.primary_path == t)
302                         break;
303         }
304 
305         return t;
306 }
307 
308 static struct sctp_transport *sctp_transport_get_idx(struct seq_file *seq,
309                                                      loff_t pos)
310 {
311         void *obj = SEQ_START_TOKEN;
312 
313         while (pos && (obj = sctp_transport_get_next(seq)) && !IS_ERR(obj))
314                 pos--;
315 
316         return obj;
317 }
318 
319 static int sctp_transport_walk_start(struct seq_file *seq)
320 {
321         struct sctp_ht_iter *iter = seq->private;
322         int err;
323 
324         err = rhashtable_walk_init(&sctp_transport_hashtable, &iter->hti);
325         if (err)
326                 return err;
327 
328         err = rhashtable_walk_start(&iter->hti);
329 
330         return err == -EAGAIN ? 0 : err;
331 }
332 
333 static void sctp_transport_walk_stop(struct seq_file *seq)
334 {
335         struct sctp_ht_iter *iter = seq->private;
336 
337         rhashtable_walk_stop(&iter->hti);
338         rhashtable_walk_exit(&iter->hti);
339 }
340 
341 static void *sctp_assocs_seq_start(struct seq_file *seq, loff_t *pos)
342 {
343         int err = sctp_transport_walk_start(seq);
344 
345         if (err)
346                 return ERR_PTR(err);
347 
348         return sctp_transport_get_idx(seq, *pos);
349 }
350 
351 static void sctp_assocs_seq_stop(struct seq_file *seq, void *v)
352 {
353         sctp_transport_walk_stop(seq);
354 }
355 
356 static void *sctp_assocs_seq_next(struct seq_file *seq, void *v, loff_t *pos)
357 {
358         ++*pos;
359 
360         return sctp_transport_get_next(seq);
361 }
362 
363 /* Display sctp associations (/proc/net/sctp/assocs). */
364 static int sctp_assocs_seq_show(struct seq_file *seq, void *v)
365 {
366         struct sctp_transport *transport;
367         struct sctp_association *assoc;
368         struct sctp_ep_common *epb;
369         struct sock *sk;
370 
371         if (v == SEQ_START_TOKEN) {
372                 seq_printf(seq, " ASSOC     SOCK   STY SST ST HBKT "
373                                 "ASSOC-ID TX_QUEUE RX_QUEUE UID INODE LPORT "
374                                 "RPORT LADDRS <-> RADDRS "
375                                 "HBINT INS OUTS MAXRT T1X T2X RTXC "
376                                 "wmema wmemq sndbuf rcvbuf\n");
377                 return 0;
378         }
379 
380         transport = (struct sctp_transport *)v;
381         if (!sctp_transport_hold(transport))
382                 return 0;
383         assoc = transport->asoc;
384         epb = &assoc->base;
385         sk = epb->sk;
386 
387         seq_printf(seq,
388                    "%8pK %8pK %-3d %-3d %-2d %-4d "
389                    "%4d %8d %8d %7u %5lu %-5d %5d ",
390                    assoc, sk, sctp_sk(sk)->type, sk->sk_state,
391                    assoc->state, 0,
392                    assoc->assoc_id,
393                    assoc->sndbuf_used,
394                    atomic_read(&assoc->rmem_alloc),
395                    from_kuid_munged(seq_user_ns(seq), sock_i_uid(sk)),
396                    sock_i_ino(sk),
397                    epb->bind_addr.port,
398                    assoc->peer.port);
399         seq_printf(seq, " ");
400         sctp_seq_dump_local_addrs(seq, epb);
401         seq_printf(seq, "<-> ");
402         sctp_seq_dump_remote_addrs(seq, assoc);
403         seq_printf(seq, "\t%8lu %5d %5d %4d %4d %4d %8d "
404                    "%8d %8d %8d %8d",
405                 assoc->hbinterval, assoc->c.sinit_max_instreams,
406                 assoc->c.sinit_num_ostreams, assoc->max_retrans,
407                 assoc->init_retries, assoc->shutdown_retries,
408                 assoc->rtx_data_chunks,
409                 atomic_read(&sk->sk_wmem_alloc),
410                 sk->sk_wmem_queued,
411                 sk->sk_sndbuf,
412                 sk->sk_rcvbuf);
413         seq_printf(seq, "\n");
414 
415         sctp_transport_put(transport);
416 
417         return 0;
418 }
419 
420 static const struct seq_operations sctp_assoc_ops = {
421         .start = sctp_assocs_seq_start,
422         .next  = sctp_assocs_seq_next,
423         .stop  = sctp_assocs_seq_stop,
424         .show  = sctp_assocs_seq_show,
425 };
426 
427 /* Initialize the seq file operations for 'assocs' object. */
428 static int sctp_assocs_seq_open(struct inode *inode, struct file *file)
429 {
430         return seq_open_net(inode, file, &sctp_assoc_ops,
431                             sizeof(struct sctp_ht_iter));
432 }
433 
434 static const struct file_operations sctp_assocs_seq_fops = {
435         .open    = sctp_assocs_seq_open,
436         .read    = seq_read,
437         .llseek  = seq_lseek,
438         .release = seq_release_net,
439 };
440 
441 /* Set up the proc fs entry for 'assocs' object. */
442 int __net_init sctp_assocs_proc_init(struct net *net)
443 {
444         struct proc_dir_entry *p;
445 
446         p = proc_create("assocs", S_IRUGO, net->sctp.proc_net_sctp,
447                         &sctp_assocs_seq_fops);
448         if (!p)
449                 return -ENOMEM;
450 
451         return 0;
452 }
453 
454 /* Cleanup the proc fs entry for 'assocs' object. */
455 void sctp_assocs_proc_exit(struct net *net)
456 {
457         remove_proc_entry("assocs", net->sctp.proc_net_sctp);
458 }
459 
460 static void *sctp_remaddr_seq_start(struct seq_file *seq, loff_t *pos)
461 {
462         int err = sctp_transport_walk_start(seq);
463 
464         if (err)
465                 return ERR_PTR(err);
466 
467         return sctp_transport_get_idx(seq, *pos);
468 }
469 
470 static void *sctp_remaddr_seq_next(struct seq_file *seq, void *v, loff_t *pos)
471 {
472         ++*pos;
473 
474         return sctp_transport_get_next(seq);
475 }
476 
477 static void sctp_remaddr_seq_stop(struct seq_file *seq, void *v)
478 {
479         sctp_transport_walk_stop(seq);
480 }
481 
482 static int sctp_remaddr_seq_show(struct seq_file *seq, void *v)
483 {
484         struct sctp_association *assoc;
485         struct sctp_transport *transport, *tsp;
486 
487         if (v == SEQ_START_TOKEN) {
488                 seq_printf(seq, "ADDR ASSOC_ID HB_ACT RTO MAX_PATH_RTX "
489                                 "REM_ADDR_RTX START STATE\n");
490                 return 0;
491         }
492 
493         transport = (struct sctp_transport *)v;
494         if (!sctp_transport_hold(transport))
495                 return 0;
496         assoc = transport->asoc;
497 
498         list_for_each_entry_rcu(tsp, &assoc->peer.transport_addr_list,
499                                 transports) {
500                 /*
501                  * The remote address (ADDR)
502                  */
503                 tsp->af_specific->seq_dump_addr(seq, &tsp->ipaddr);
504                 seq_printf(seq, " ");
505                 /*
506                  * The association ID (ASSOC_ID)
507                  */
508                 seq_printf(seq, "%d ", tsp->asoc->assoc_id);
509 
510                 /*
511                  * If the Heartbeat is active (HB_ACT)
512                  * Note: 1 = Active, 0 = Inactive
513                  */
514                 seq_printf(seq, "%d ", timer_pending(&tsp->hb_timer));
515 
516                 /*
517                  * Retransmit time out (RTO)
518                  */
519                 seq_printf(seq, "%lu ", tsp->rto);
520 
521                 /*
522                  * Maximum path retransmit count (PATH_MAX_RTX)
523                  */
524                 seq_printf(seq, "%d ", tsp->pathmaxrxt);
525 
526                 /*
527                  * remote address retransmit count (REM_ADDR_RTX)
528                  * Note: We don't have a way to tally this at the moment
529                  * so lets just leave it as zero for the moment
530                  */
531                 seq_puts(seq, "0 ");
532 
533                 /*
534                  * remote address start time (START).  This is also not
535                  * currently implemented, but we can record it with a
536                  * jiffies marker in a subsequent patch
537                  */
538                 seq_puts(seq, "0 ");
539 
540                 /*
541                  * The current state of this destination. I.e.
542                  * SCTP_ACTIVE, SCTP_INACTIVE, ...
543                  */
544                 seq_printf(seq, "%d", tsp->state);
545 
546                 seq_printf(seq, "\n");
547         }
548 
549         sctp_transport_put(transport);
550 
551         return 0;
552 }
553 
554 static const struct seq_operations sctp_remaddr_ops = {
555         .start = sctp_remaddr_seq_start,
556         .next  = sctp_remaddr_seq_next,
557         .stop  = sctp_remaddr_seq_stop,
558         .show  = sctp_remaddr_seq_show,
559 };
560 
561 /* Cleanup the proc fs entry for 'remaddr' object. */
562 void sctp_remaddr_proc_exit(struct net *net)
563 {
564         remove_proc_entry("remaddr", net->sctp.proc_net_sctp);
565 }
566 
567 static int sctp_remaddr_seq_open(struct inode *inode, struct file *file)
568 {
569         return seq_open_net(inode, file, &sctp_remaddr_ops,
570                             sizeof(struct sctp_ht_iter));
571 }
572 
573 static const struct file_operations sctp_remaddr_seq_fops = {
574         .open = sctp_remaddr_seq_open,
575         .read = seq_read,
576         .llseek = seq_lseek,
577         .release = seq_release_net,
578 };
579 
580 int __net_init sctp_remaddr_proc_init(struct net *net)
581 {
582         struct proc_dir_entry *p;
583 
584         p = proc_create("remaddr", S_IRUGO, net->sctp.proc_net_sctp,
585                         &sctp_remaddr_seq_fops);
586         if (!p)
587                 return -ENOMEM;
588         return 0;
589 }
590 

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