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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         unsigned long buff[SCTP_MIB_MAX];
 77         struct net *net = seq->private;
 78         int i;
 79 
 80         memset(buff, 0, sizeof(unsigned long) * SCTP_MIB_MAX);
 81 
 82         snmp_get_cpu_field_batch(buff, sctp_snmp_list,
 83                                  net->sctp.sctp_statistics);
 84         for (i = 0; sctp_snmp_list[i].name; i++)
 85                 seq_printf(seq, "%-32s\t%ld\n", sctp_snmp_list[i].name,
 86                                                 buff[i]);
 87 
 88         return 0;
 89 }
 90 
 91 /* Initialize the seq file operations for 'snmp' object. */
 92 static int sctp_snmp_seq_open(struct inode *inode, struct file *file)
 93 {
 94         return single_open_net(inode, file, sctp_snmp_seq_show);
 95 }
 96 
 97 static const struct file_operations sctp_snmp_seq_fops = {
 98         .owner   = THIS_MODULE,
 99         .open    = sctp_snmp_seq_open,
100         .read    = seq_read,
101         .llseek  = seq_lseek,
102         .release = single_release_net,
103 };
104 
105 /* Set up the proc fs entry for 'snmp' object. */
106 int __net_init sctp_snmp_proc_init(struct net *net)
107 {
108         struct proc_dir_entry *p;
109 
110         p = proc_create("snmp", S_IRUGO, net->sctp.proc_net_sctp,
111                         &sctp_snmp_seq_fops);
112         if (!p)
113                 return -ENOMEM;
114 
115         return 0;
116 }
117 
118 /* Cleanup the proc fs entry for 'snmp' object. */
119 void sctp_snmp_proc_exit(struct net *net)
120 {
121         remove_proc_entry("snmp", net->sctp.proc_net_sctp);
122 }
123 
124 /* Dump local addresses of an association/endpoint. */
125 static void sctp_seq_dump_local_addrs(struct seq_file *seq, struct sctp_ep_common *epb)
126 {
127         struct sctp_association *asoc;
128         struct sctp_sockaddr_entry *laddr;
129         struct sctp_transport *peer;
130         union sctp_addr *addr, *primary = NULL;
131         struct sctp_af *af;
132 
133         if (epb->type == SCTP_EP_TYPE_ASSOCIATION) {
134                 asoc = sctp_assoc(epb);
135 
136                 peer = asoc->peer.primary_path;
137                 if (unlikely(peer == NULL)) {
138                         WARN(1, "Association %p with NULL primary path!\n", asoc);
139                         return;
140                 }
141 
142                 primary = &peer->saddr;
143         }
144 
145         rcu_read_lock();
146         list_for_each_entry_rcu(laddr, &epb->bind_addr.address_list, list) {
147                 if (!laddr->valid)
148                         continue;
149 
150                 addr = &laddr->a;
151                 af = sctp_get_af_specific(addr->sa.sa_family);
152                 if (primary && af->cmp_addr(addr, primary)) {
153                         seq_printf(seq, "*");
154                 }
155                 af->seq_dump_addr(seq, addr);
156         }
157         rcu_read_unlock();
158 }
159 
160 /* Dump remote addresses of an association. */
161 static void sctp_seq_dump_remote_addrs(struct seq_file *seq, struct sctp_association *assoc)
162 {
163         struct sctp_transport *transport;
164         union sctp_addr *addr, *primary;
165         struct sctp_af *af;
166 
167         primary = &assoc->peer.primary_addr;
168         list_for_each_entry_rcu(transport, &assoc->peer.transport_addr_list,
169                         transports) {
170                 addr = &transport->ipaddr;
171 
172                 af = sctp_get_af_specific(addr->sa.sa_family);
173                 if (af->cmp_addr(addr, primary)) {
174                         seq_printf(seq, "*");
175                 }
176                 af->seq_dump_addr(seq, addr);
177         }
178 }
179 
180 static void *sctp_eps_seq_start(struct seq_file *seq, loff_t *pos)
181 {
182         if (*pos >= sctp_ep_hashsize)
183                 return NULL;
184 
185         if (*pos < 0)
186                 *pos = 0;
187 
188         if (*pos == 0)
189                 seq_printf(seq, " ENDPT     SOCK   STY SST HBKT LPORT   UID INODE LADDRS\n");
190 
191         return (void *)pos;
192 }
193 
194 static void sctp_eps_seq_stop(struct seq_file *seq, void *v)
195 {
196 }
197 
198 
199 static void *sctp_eps_seq_next(struct seq_file *seq, void *v, loff_t *pos)
200 {
201         if (++*pos >= sctp_ep_hashsize)
202                 return NULL;
203 
204         return pos;
205 }
206 
207 
208 /* Display sctp endpoints (/proc/net/sctp/eps). */
209 static int sctp_eps_seq_show(struct seq_file *seq, void *v)
210 {
211         struct sctp_hashbucket *head;
212         struct sctp_ep_common *epb;
213         struct sctp_endpoint *ep;
214         struct sock *sk;
215         int    hash = *(loff_t *)v;
216 
217         if (hash >= sctp_ep_hashsize)
218                 return -ENOMEM;
219 
220         head = &sctp_ep_hashtable[hash];
221         read_lock_bh(&head->lock);
222         sctp_for_each_hentry(epb, &head->chain) {
223                 ep = sctp_ep(epb);
224                 sk = epb->sk;
225                 if (!net_eq(sock_net(sk), seq_file_net(seq)))
226                         continue;
227                 seq_printf(seq, "%8pK %8pK %-3d %-3d %-4d %-5d %5u %5lu ", ep, sk,
228                            sctp_sk(sk)->type, sk->sk_state, hash,
229                            epb->bind_addr.port,
230                            from_kuid_munged(seq_user_ns(seq), sock_i_uid(sk)),
231                            sock_i_ino(sk));
232 
233                 sctp_seq_dump_local_addrs(seq, epb);
234                 seq_printf(seq, "\n");
235         }
236         read_unlock_bh(&head->lock);
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         int start_fail;
286 };
287 
288 static void *sctp_transport_seq_start(struct seq_file *seq, loff_t *pos)
289 {
290         struct sctp_ht_iter *iter = seq->private;
291         int err = sctp_transport_walk_start(&iter->hti);
292 
293         if (err) {
294                 iter->start_fail = 1;
295                 return ERR_PTR(err);
296         }
297 
298         iter->start_fail = 0;
299         return sctp_transport_get_idx(seq_file_net(seq), &iter->hti, *pos);
300 }
301 
302 static void sctp_transport_seq_stop(struct seq_file *seq, void *v)
303 {
304         struct sctp_ht_iter *iter = seq->private;
305 
306         if (iter->start_fail)
307                 return;
308         sctp_transport_walk_stop(&iter->hti);
309 }
310 
311 static void *sctp_transport_seq_next(struct seq_file *seq, void *v, loff_t *pos)
312 {
313         struct sctp_ht_iter *iter = seq->private;
314 
315         ++*pos;
316 
317         return sctp_transport_get_next(seq_file_net(seq), &iter->hti);
318 }
319 
320 /* Display sctp associations (/proc/net/sctp/assocs). */
321 static int sctp_assocs_seq_show(struct seq_file *seq, void *v)
322 {
323         struct sctp_transport *transport;
324         struct sctp_association *assoc;
325         struct sctp_ep_common *epb;
326         struct sock *sk;
327 
328         if (v == SEQ_START_TOKEN) {
329                 seq_printf(seq, " ASSOC     SOCK   STY SST ST HBKT "
330                                 "ASSOC-ID TX_QUEUE RX_QUEUE UID INODE LPORT "
331                                 "RPORT LADDRS <-> RADDRS "
332                                 "HBINT INS OUTS MAXRT T1X T2X RTXC "
333                                 "wmema wmemq sndbuf rcvbuf\n");
334                 return 0;
335         }
336 
337         transport = (struct sctp_transport *)v;
338         if (!sctp_transport_hold(transport))
339                 return 0;
340         assoc = transport->asoc;
341         epb = &assoc->base;
342         sk = epb->sk;
343 
344         seq_printf(seq,
345                    "%8pK %8pK %-3d %-3d %-2d %-4d "
346                    "%4d %8d %8d %7u %5lu %-5d %5d ",
347                    assoc, sk, sctp_sk(sk)->type, sk->sk_state,
348                    assoc->state, 0,
349                    assoc->assoc_id,
350                    assoc->sndbuf_used,
351                    atomic_read(&assoc->rmem_alloc),
352                    from_kuid_munged(seq_user_ns(seq), sock_i_uid(sk)),
353                    sock_i_ino(sk),
354                    epb->bind_addr.port,
355                    assoc->peer.port);
356         seq_printf(seq, " ");
357         sctp_seq_dump_local_addrs(seq, epb);
358         seq_printf(seq, "<-> ");
359         sctp_seq_dump_remote_addrs(seq, assoc);
360         seq_printf(seq, "\t%8lu %5d %5d %4d %4d %4d %8d "
361                    "%8d %8d %8d %8d",
362                 assoc->hbinterval, assoc->stream.incnt,
363                 assoc->stream.outcnt, assoc->max_retrans,
364                 assoc->init_retries, assoc->shutdown_retries,
365                 assoc->rtx_data_chunks,
366                 refcount_read(&sk->sk_wmem_alloc),
367                 sk->sk_wmem_queued,
368                 sk->sk_sndbuf,
369                 sk->sk_rcvbuf);
370         seq_printf(seq, "\n");
371 
372         sctp_transport_put(transport);
373 
374         return 0;
375 }
376 
377 static const struct seq_operations sctp_assoc_ops = {
378         .start = sctp_transport_seq_start,
379         .next  = sctp_transport_seq_next,
380         .stop  = sctp_transport_seq_stop,
381         .show  = sctp_assocs_seq_show,
382 };
383 
384 /* Initialize the seq file operations for 'assocs' object. */
385 static int sctp_assocs_seq_open(struct inode *inode, struct file *file)
386 {
387         return seq_open_net(inode, file, &sctp_assoc_ops,
388                             sizeof(struct sctp_ht_iter));
389 }
390 
391 static const struct file_operations sctp_assocs_seq_fops = {
392         .open    = sctp_assocs_seq_open,
393         .read    = seq_read,
394         .llseek  = seq_lseek,
395         .release = seq_release_net,
396 };
397 
398 /* Set up the proc fs entry for 'assocs' object. */
399 int __net_init sctp_assocs_proc_init(struct net *net)
400 {
401         struct proc_dir_entry *p;
402 
403         p = proc_create("assocs", S_IRUGO, net->sctp.proc_net_sctp,
404                         &sctp_assocs_seq_fops);
405         if (!p)
406                 return -ENOMEM;
407 
408         return 0;
409 }
410 
411 /* Cleanup the proc fs entry for 'assocs' object. */
412 void sctp_assocs_proc_exit(struct net *net)
413 {
414         remove_proc_entry("assocs", net->sctp.proc_net_sctp);
415 }
416 
417 static int sctp_remaddr_seq_show(struct seq_file *seq, void *v)
418 {
419         struct sctp_association *assoc;
420         struct sctp_transport *transport, *tsp;
421 
422         if (v == SEQ_START_TOKEN) {
423                 seq_printf(seq, "ADDR ASSOC_ID HB_ACT RTO MAX_PATH_RTX "
424                                 "REM_ADDR_RTX START STATE\n");
425                 return 0;
426         }
427 
428         transport = (struct sctp_transport *)v;
429         if (!sctp_transport_hold(transport))
430                 return 0;
431         assoc = transport->asoc;
432 
433         list_for_each_entry_rcu(tsp, &assoc->peer.transport_addr_list,
434                                 transports) {
435                 /*
436                  * The remote address (ADDR)
437                  */
438                 tsp->af_specific->seq_dump_addr(seq, &tsp->ipaddr);
439                 seq_printf(seq, " ");
440                 /*
441                  * The association ID (ASSOC_ID)
442                  */
443                 seq_printf(seq, "%d ", tsp->asoc->assoc_id);
444 
445                 /*
446                  * If the Heartbeat is active (HB_ACT)
447                  * Note: 1 = Active, 0 = Inactive
448                  */
449                 seq_printf(seq, "%d ", timer_pending(&tsp->hb_timer));
450 
451                 /*
452                  * Retransmit time out (RTO)
453                  */
454                 seq_printf(seq, "%lu ", tsp->rto);
455 
456                 /*
457                  * Maximum path retransmit count (PATH_MAX_RTX)
458                  */
459                 seq_printf(seq, "%d ", tsp->pathmaxrxt);
460 
461                 /*
462                  * remote address retransmit count (REM_ADDR_RTX)
463                  * Note: We don't have a way to tally this at the moment
464                  * so lets just leave it as zero for the moment
465                  */
466                 seq_puts(seq, "0 ");
467 
468                 /*
469                  * remote address start time (START).  This is also not
470                  * currently implemented, but we can record it with a
471                  * jiffies marker in a subsequent patch
472                  */
473                 seq_puts(seq, "0 ");
474 
475                 /*
476                  * The current state of this destination. I.e.
477                  * SCTP_ACTIVE, SCTP_INACTIVE, ...
478                  */
479                 seq_printf(seq, "%d", tsp->state);
480 
481                 seq_printf(seq, "\n");
482         }
483 
484         sctp_transport_put(transport);
485 
486         return 0;
487 }
488 
489 static const struct seq_operations sctp_remaddr_ops = {
490         .start = sctp_transport_seq_start,
491         .next  = sctp_transport_seq_next,
492         .stop  = sctp_transport_seq_stop,
493         .show  = sctp_remaddr_seq_show,
494 };
495 
496 /* Cleanup the proc fs entry for 'remaddr' object. */
497 void sctp_remaddr_proc_exit(struct net *net)
498 {
499         remove_proc_entry("remaddr", net->sctp.proc_net_sctp);
500 }
501 
502 static int sctp_remaddr_seq_open(struct inode *inode, struct file *file)
503 {
504         return seq_open_net(inode, file, &sctp_remaddr_ops,
505                             sizeof(struct sctp_ht_iter));
506 }
507 
508 static const struct file_operations sctp_remaddr_seq_fops = {
509         .open = sctp_remaddr_seq_open,
510         .read = seq_read,
511         .llseek = seq_lseek,
512         .release = seq_release_net,
513 };
514 
515 int __net_init sctp_remaddr_proc_init(struct net *net)
516 {
517         struct proc_dir_entry *p;
518 
519         p = proc_create("remaddr", S_IRUGO, net->sctp.proc_net_sctp,
520                         &sctp_remaddr_seq_fops);
521         if (!p)
522                 return -ENOMEM;
523         return 0;
524 }
525 

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