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; 291 292 sctp_transport_walk_start(&iter->hti); 293 294 iter->start_fail = 0; 295 return sctp_transport_get_idx(seq_file_net(seq), &iter->hti, *pos); 296 } 297 298 static void sctp_transport_seq_stop(struct seq_file *seq, void *v) 299 { 300 struct sctp_ht_iter *iter = seq->private; 301 302 if (iter->start_fail) 303 return; 304 sctp_transport_walk_stop(&iter->hti); 305 } 306 307 static void *sctp_transport_seq_next(struct seq_file *seq, void *v, loff_t *pos) 308 { 309 struct sctp_ht_iter *iter = seq->private; 310 311 ++*pos; 312 313 return sctp_transport_get_next(seq_file_net(seq), &iter->hti); 314 } 315 316 /* Display sctp associations (/proc/net/sctp/assocs). */ 317 static int sctp_assocs_seq_show(struct seq_file *seq, void *v) 318 { 319 struct sctp_transport *transport; 320 struct sctp_association *assoc; 321 struct sctp_ep_common *epb; 322 struct sock *sk; 323 324 if (v == SEQ_START_TOKEN) { 325 seq_printf(seq, " ASSOC SOCK STY SST ST HBKT " 326 "ASSOC-ID TX_QUEUE RX_QUEUE UID INODE LPORT " 327 "RPORT LADDRS <-> RADDRS " 328 "HBINT INS OUTS MAXRT T1X T2X RTXC " 329 "wmema wmemq sndbuf rcvbuf\n"); 330 return 0; 331 } 332 333 transport = (struct sctp_transport *)v; 334 if (!sctp_transport_hold(transport)) 335 return 0; 336 assoc = transport->asoc; 337 epb = &assoc->base; 338 sk = epb->sk; 339 340 seq_printf(seq, 341 "%8pK %8pK %-3d %-3d %-2d %-4d " 342 "%4d %8d %8d %7u %5lu %-5d %5d ", 343 assoc, sk, sctp_sk(sk)->type, sk->sk_state, 344 assoc->state, 0, 345 assoc->assoc_id, 346 assoc->sndbuf_used, 347 atomic_read(&assoc->rmem_alloc), 348 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sk)), 349 sock_i_ino(sk), 350 epb->bind_addr.port, 351 assoc->peer.port); 352 seq_printf(seq, " "); 353 sctp_seq_dump_local_addrs(seq, epb); 354 seq_printf(seq, "<-> "); 355 sctp_seq_dump_remote_addrs(seq, assoc); 356 seq_printf(seq, "\t%8lu %5d %5d %4d %4d %4d %8d " 357 "%8d %8d %8d %8d", 358 assoc->hbinterval, assoc->stream.incnt, 359 assoc->stream.outcnt, assoc->max_retrans, 360 assoc->init_retries, assoc->shutdown_retries, 361 assoc->rtx_data_chunks, 362 refcount_read(&sk->sk_wmem_alloc), 363 sk->sk_wmem_queued, 364 sk->sk_sndbuf, 365 sk->sk_rcvbuf); 366 seq_printf(seq, "\n"); 367 368 sctp_transport_put(transport); 369 370 return 0; 371 } 372 373 static const struct seq_operations sctp_assoc_ops = { 374 .start = sctp_transport_seq_start, 375 .next = sctp_transport_seq_next, 376 .stop = sctp_transport_seq_stop, 377 .show = sctp_assocs_seq_show, 378 }; 379 380 /* Initialize the seq file operations for 'assocs' object. */ 381 static int sctp_assocs_seq_open(struct inode *inode, struct file *file) 382 { 383 return seq_open_net(inode, file, &sctp_assoc_ops, 384 sizeof(struct sctp_ht_iter)); 385 } 386 387 static const struct file_operations sctp_assocs_seq_fops = { 388 .open = sctp_assocs_seq_open, 389 .read = seq_read, 390 .llseek = seq_lseek, 391 .release = seq_release_net, 392 }; 393 394 /* Set up the proc fs entry for 'assocs' object. */ 395 int __net_init sctp_assocs_proc_init(struct net *net) 396 { 397 struct proc_dir_entry *p; 398 399 p = proc_create("assocs", S_IRUGO, net->sctp.proc_net_sctp, 400 &sctp_assocs_seq_fops); 401 if (!p) 402 return -ENOMEM; 403 404 return 0; 405 } 406 407 /* Cleanup the proc fs entry for 'assocs' object. */ 408 void sctp_assocs_proc_exit(struct net *net) 409 { 410 remove_proc_entry("assocs", net->sctp.proc_net_sctp); 411 } 412 413 static int sctp_remaddr_seq_show(struct seq_file *seq, void *v) 414 { 415 struct sctp_association *assoc; 416 struct sctp_transport *transport, *tsp; 417 418 if (v == SEQ_START_TOKEN) { 419 seq_printf(seq, "ADDR ASSOC_ID HB_ACT RTO MAX_PATH_RTX " 420 "REM_ADDR_RTX START STATE\n"); 421 return 0; 422 } 423 424 transport = (struct sctp_transport *)v; 425 if (!sctp_transport_hold(transport)) 426 return 0; 427 assoc = transport->asoc; 428 429 list_for_each_entry_rcu(tsp, &assoc->peer.transport_addr_list, 430 transports) { 431 /* 432 * The remote address (ADDR) 433 */ 434 tsp->af_specific->seq_dump_addr(seq, &tsp->ipaddr); 435 seq_printf(seq, " "); 436 /* 437 * The association ID (ASSOC_ID) 438 */ 439 seq_printf(seq, "%d ", tsp->asoc->assoc_id); 440 441 /* 442 * If the Heartbeat is active (HB_ACT) 443 * Note: 1 = Active, 0 = Inactive 444 */ 445 seq_printf(seq, "%d ", timer_pending(&tsp->hb_timer)); 446 447 /* 448 * Retransmit time out (RTO) 449 */ 450 seq_printf(seq, "%lu ", tsp->rto); 451 452 /* 453 * Maximum path retransmit count (PATH_MAX_RTX) 454 */ 455 seq_printf(seq, "%d ", tsp->pathmaxrxt); 456 457 /* 458 * remote address retransmit count (REM_ADDR_RTX) 459 * Note: We don't have a way to tally this at the moment 460 * so lets just leave it as zero for the moment 461 */ 462 seq_puts(seq, "0 "); 463 464 /* 465 * remote address start time (START). This is also not 466 * currently implemented, but we can record it with a 467 * jiffies marker in a subsequent patch 468 */ 469 seq_puts(seq, "0 "); 470 471 /* 472 * The current state of this destination. I.e. 473 * SCTP_ACTIVE, SCTP_INACTIVE, ... 474 */ 475 seq_printf(seq, "%d", tsp->state); 476 477 seq_printf(seq, "\n"); 478 } 479 480 sctp_transport_put(transport); 481 482 return 0; 483 } 484 485 static const struct seq_operations sctp_remaddr_ops = { 486 .start = sctp_transport_seq_start, 487 .next = sctp_transport_seq_next, 488 .stop = sctp_transport_seq_stop, 489 .show = sctp_remaddr_seq_show, 490 }; 491 492 /* Cleanup the proc fs entry for 'remaddr' object. */ 493 void sctp_remaddr_proc_exit(struct net *net) 494 { 495 remove_proc_entry("remaddr", net->sctp.proc_net_sctp); 496 } 497 498 static int sctp_remaddr_seq_open(struct inode *inode, struct file *file) 499 { 500 return seq_open_net(inode, file, &sctp_remaddr_ops, 501 sizeof(struct sctp_ht_iter)); 502 } 503 504 static const struct file_operations sctp_remaddr_seq_fops = { 505 .open = sctp_remaddr_seq_open, 506 .read = seq_read, 507 .llseek = seq_lseek, 508 .release = seq_release_net, 509 }; 510 511 int __net_init sctp_remaddr_proc_init(struct net *net) 512 { 513 struct proc_dir_entry *p; 514 515 p = proc_create("remaddr", S_IRUGO, net->sctp.proc_net_sctp, 516 &sctp_remaddr_seq_fops); 517 if (!p) 518 return -ENOMEM; 519 return 0; 520 } 521