net/sctp/proc.c

   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 }