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