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         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 *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         tsp = (struct sctp_transport *)v;
 494         if (!sctp_transport_hold(tsp))
 495                 return 0;
 496         assoc = tsp->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(tsp);
 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 }