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 .open = sctp_snmp_seq_open, 99 .read = seq_read, 100 .llseek = seq_lseek, 101 .release = single_release_net, 102 }; 103 104 /* Dump local addresses of an association/endpoint. */ 105 static void sctp_seq_dump_local_addrs(struct seq_file *seq, struct sctp_ep_common *epb) 106 { 107 struct sctp_association *asoc; 108 struct sctp_sockaddr_entry *laddr; 109 struct sctp_transport *peer; 110 union sctp_addr *addr, *primary = NULL; 111 struct sctp_af *af; 112 113 if (epb->type == SCTP_EP_TYPE_ASSOCIATION) { 114 asoc = sctp_assoc(epb); 115 116 peer = asoc->peer.primary_path; 117 if (unlikely(peer == NULL)) { 118 WARN(1, "Association %p with NULL primary path!\n", asoc); 119 return; 120 } 121 122 primary = &peer->saddr; 123 } 124 125 rcu_read_lock(); 126 list_for_each_entry_rcu(laddr, &epb->bind_addr.address_list, list) { 127 if (!laddr->valid) 128 continue; 129 130 addr = &laddr->a; 131 af = sctp_get_af_specific(addr->sa.sa_family); 132 if (primary && af->cmp_addr(addr, primary)) { 133 seq_printf(seq, "*"); 134 } 135 af->seq_dump_addr(seq, addr); 136 } 137 rcu_read_unlock(); 138 } 139 140 /* Dump remote addresses of an association. */ 141 static void sctp_seq_dump_remote_addrs(struct seq_file *seq, struct sctp_association *assoc) 142 { 143 struct sctp_transport *transport; 144 union sctp_addr *addr, *primary; 145 struct sctp_af *af; 146 147 primary = &assoc->peer.primary_addr; 148 list_for_each_entry_rcu(transport, &assoc->peer.transport_addr_list, 149 transports) { 150 addr = &transport->ipaddr; 151 152 af = sctp_get_af_specific(addr->sa.sa_family); 153 if (af->cmp_addr(addr, primary)) { 154 seq_printf(seq, "*"); 155 } 156 af->seq_dump_addr(seq, addr); 157 } 158 } 159 160 static void *sctp_eps_seq_start(struct seq_file *seq, loff_t *pos) 161 { 162 if (*pos >= sctp_ep_hashsize) 163 return NULL; 164 165 if (*pos < 0) 166 *pos = 0; 167 168 if (*pos == 0) 169 seq_printf(seq, " ENDPT SOCK STY SST HBKT LPORT UID INODE LADDRS\n"); 170 171 return (void *)pos; 172 } 173 174 static void sctp_eps_seq_stop(struct seq_file *seq, void *v) 175 { 176 } 177 178 179 static void *sctp_eps_seq_next(struct seq_file *seq, void *v, loff_t *pos) 180 { 181 if (++*pos >= sctp_ep_hashsize) 182 return NULL; 183 184 return pos; 185 } 186 187 188 /* Display sctp endpoints (/proc/net/sctp/eps). */ 189 static int sctp_eps_seq_show(struct seq_file *seq, void *v) 190 { 191 struct sctp_hashbucket *head; 192 struct sctp_ep_common *epb; 193 struct sctp_endpoint *ep; 194 struct sock *sk; 195 int hash = *(loff_t *)v; 196 197 if (hash >= sctp_ep_hashsize) 198 return -ENOMEM; 199 200 head = &sctp_ep_hashtable[hash]; 201 read_lock_bh(&head->lock); 202 sctp_for_each_hentry(epb, &head->chain) { 203 ep = sctp_ep(epb); 204 sk = epb->sk; 205 if (!net_eq(sock_net(sk), seq_file_net(seq))) 206 continue; 207 seq_printf(seq, "%8pK %8pK %-3d %-3d %-4d %-5d %5u %5lu ", ep, sk, 208 sctp_sk(sk)->type, sk->sk_state, hash, 209 epb->bind_addr.port, 210 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sk)), 211 sock_i_ino(sk)); 212 213 sctp_seq_dump_local_addrs(seq, epb); 214 seq_printf(seq, "\n"); 215 } 216 read_unlock_bh(&head->lock); 217 218 return 0; 219 } 220 221 static const struct seq_operations sctp_eps_ops = { 222 .start = sctp_eps_seq_start, 223 .next = sctp_eps_seq_next, 224 .stop = sctp_eps_seq_stop, 225 .show = sctp_eps_seq_show, 226 }; 227 228 229 /* Initialize the seq file operations for 'eps' object. */ 230 static int sctp_eps_seq_open(struct inode *inode, struct file *file) 231 { 232 return seq_open_net(inode, file, &sctp_eps_ops, 233 sizeof(struct seq_net_private)); 234 } 235 236 static const struct file_operations sctp_eps_seq_fops = { 237 .open = sctp_eps_seq_open, 238 .read = seq_read, 239 .llseek = seq_lseek, 240 .release = seq_release_net, 241 }; 242 243 struct sctp_ht_iter { 244 struct seq_net_private p; 245 struct rhashtable_iter hti; 246 int start_fail; 247 }; 248 249 static void *sctp_transport_seq_start(struct seq_file *seq, loff_t *pos) 250 { 251 struct sctp_ht_iter *iter = seq->private; 252 253 sctp_transport_walk_start(&iter->hti); 254 255 iter->start_fail = 0; 256 return sctp_transport_get_idx(seq_file_net(seq), &iter->hti, *pos); 257 } 258 259 static void sctp_transport_seq_stop(struct seq_file *seq, void *v) 260 { 261 struct sctp_ht_iter *iter = seq->private; 262 263 if (iter->start_fail) 264 return; 265 sctp_transport_walk_stop(&iter->hti); 266 } 267 268 static void *sctp_transport_seq_next(struct seq_file *seq, void *v, loff_t *pos) 269 { 270 struct sctp_ht_iter *iter = seq->private; 271 272 ++*pos; 273 274 return sctp_transport_get_next(seq_file_net(seq), &iter->hti); 275 } 276 277 /* Display sctp associations (/proc/net/sctp/assocs). */ 278 static int sctp_assocs_seq_show(struct seq_file *seq, void *v) 279 { 280 struct sctp_transport *transport; 281 struct sctp_association *assoc; 282 struct sctp_ep_common *epb; 283 struct sock *sk; 284 285 if (v == SEQ_START_TOKEN) { 286 seq_printf(seq, " ASSOC SOCK STY SST ST HBKT " 287 "ASSOC-ID TX_QUEUE RX_QUEUE UID INODE LPORT " 288 "RPORT LADDRS <-> RADDRS " 289 "HBINT INS OUTS MAXRT T1X T2X RTXC " 290 "wmema wmemq sndbuf rcvbuf\n"); 291 return 0; 292 } 293 294 transport = (struct sctp_transport *)v; 295 if (!sctp_transport_hold(transport)) 296 return 0; 297 assoc = transport->asoc; 298 epb = &assoc->base; 299 sk = epb->sk; 300 301 seq_printf(seq, 302 "%8pK %8pK %-3d %-3d %-2d %-4d " 303 "%4d %8d %8d %7u %5lu %-5d %5d ", 304 assoc, sk, sctp_sk(sk)->type, sk->sk_state, 305 assoc->state, 0, 306 assoc->assoc_id, 307 assoc->sndbuf_used, 308 atomic_read(&assoc->rmem_alloc), 309 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sk)), 310 sock_i_ino(sk), 311 epb->bind_addr.port, 312 assoc->peer.port); 313 seq_printf(seq, " "); 314 sctp_seq_dump_local_addrs(seq, epb); 315 seq_printf(seq, "<-> "); 316 sctp_seq_dump_remote_addrs(seq, assoc); 317 seq_printf(seq, "\t%8lu %5d %5d %4d %4d %4d %8d " 318 "%8d %8d %8d %8d", 319 assoc->hbinterval, assoc->stream.incnt, 320 assoc->stream.outcnt, assoc->max_retrans, 321 assoc->init_retries, assoc->shutdown_retries, 322 assoc->rtx_data_chunks, 323 refcount_read(&sk->sk_wmem_alloc), 324 sk->sk_wmem_queued, 325 sk->sk_sndbuf, 326 sk->sk_rcvbuf); 327 seq_printf(seq, "\n"); 328 329 sctp_transport_put(transport); 330 331 return 0; 332 } 333 334 static const struct seq_operations sctp_assoc_ops = { 335 .start = sctp_transport_seq_start, 336 .next = sctp_transport_seq_next, 337 .stop = sctp_transport_seq_stop, 338 .show = sctp_assocs_seq_show, 339 }; 340 341 /* Initialize the seq file operations for 'assocs' object. */ 342 static int sctp_assocs_seq_open(struct inode *inode, struct file *file) 343 { 344 return seq_open_net(inode, file, &sctp_assoc_ops, 345 sizeof(struct sctp_ht_iter)); 346 } 347 348 static const struct file_operations sctp_assocs_seq_fops = { 349 .open = sctp_assocs_seq_open, 350 .read = seq_read, 351 .llseek = seq_lseek, 352 .release = seq_release_net, 353 }; 354 355 static int sctp_remaddr_seq_show(struct seq_file *seq, void *v) 356 { 357 struct sctp_association *assoc; 358 struct sctp_transport *transport, *tsp; 359 360 if (v == SEQ_START_TOKEN) { 361 seq_printf(seq, "ADDR ASSOC_ID HB_ACT RTO MAX_PATH_RTX " 362 "REM_ADDR_RTX START STATE\n"); 363 return 0; 364 } 365 366 transport = (struct sctp_transport *)v; 367 if (!sctp_transport_hold(transport)) 368 return 0; 369 assoc = transport->asoc; 370 371 list_for_each_entry_rcu(tsp, &assoc->peer.transport_addr_list, 372 transports) { 373 /* 374 * The remote address (ADDR) 375 */ 376 tsp->af_specific->seq_dump_addr(seq, &tsp->ipaddr); 377 seq_printf(seq, " "); 378 /* 379 * The association ID (ASSOC_ID) 380 */ 381 seq_printf(seq, "%d ", tsp->asoc->assoc_id); 382 383 /* 384 * If the Heartbeat is active (HB_ACT) 385 * Note: 1 = Active, 0 = Inactive 386 */ 387 seq_printf(seq, "%d ", timer_pending(&tsp->hb_timer)); 388 389 /* 390 * Retransmit time out (RTO) 391 */ 392 seq_printf(seq, "%lu ", tsp->rto); 393 394 /* 395 * Maximum path retransmit count (PATH_MAX_RTX) 396 */ 397 seq_printf(seq, "%d ", tsp->pathmaxrxt); 398 399 /* 400 * remote address retransmit count (REM_ADDR_RTX) 401 * Note: We don't have a way to tally this at the moment 402 * so lets just leave it as zero for the moment 403 */ 404 seq_puts(seq, "0 "); 405 406 /* 407 * remote address start time (START). This is also not 408 * currently implemented, but we can record it with a 409 * jiffies marker in a subsequent patch 410 */ 411 seq_puts(seq, "0 "); 412 413 /* 414 * The current state of this destination. I.e. 415 * SCTP_ACTIVE, SCTP_INACTIVE, ... 416 */ 417 seq_printf(seq, "%d", tsp->state); 418 419 seq_printf(seq, "\n"); 420 } 421 422 sctp_transport_put(transport); 423 424 return 0; 425 } 426 427 static const struct seq_operations sctp_remaddr_ops = { 428 .start = sctp_transport_seq_start, 429 .next = sctp_transport_seq_next, 430 .stop = sctp_transport_seq_stop, 431 .show = sctp_remaddr_seq_show, 432 }; 433 434 static int sctp_remaddr_seq_open(struct inode *inode, struct file *file) 435 { 436 return seq_open_net(inode, file, &sctp_remaddr_ops, 437 sizeof(struct sctp_ht_iter)); 438 } 439 440 static const struct file_operations sctp_remaddr_seq_fops = { 441 .open = sctp_remaddr_seq_open, 442 .read = seq_read, 443 .llseek = seq_lseek, 444 .release = seq_release_net, 445 }; 446 447 /* Set up the proc fs entry for the SCTP protocol. */ 448 int __net_init sctp_proc_init(struct net *net) 449 { 450 net->sctp.proc_net_sctp = proc_net_mkdir(net, "sctp", net->proc_net); 451 if (!net->sctp.proc_net_sctp) 452 return -ENOMEM; 453 if (!proc_create("snmp", 0444, net->sctp.proc_net_sctp, 454 &sctp_snmp_seq_fops)) 455 goto cleanup; 456 if (!proc_create("eps", 0444, net->sctp.proc_net_sctp, 457 &sctp_eps_seq_fops)) 458 goto cleanup; 459 if (!proc_create("assocs", 0444, net->sctp.proc_net_sctp, 460 &sctp_assocs_seq_fops)) 461 goto cleanup; 462 if (!proc_create("remaddr", 0444, net->sctp.proc_net_sctp, 463 &sctp_remaddr_seq_fops)) 464 goto cleanup; 465 return 0; 466 467 cleanup: 468 remove_proc_subtree("sctp", net->proc_net); 469 net->sctp.proc_net_sctp = NULL; 470 return -ENOMEM; 471 } 472