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 } 590