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 /* Dump local addresses of an association/endpoint. */ 92 static void sctp_seq_dump_local_addrs(struct seq_file *seq, struct sctp_ep_common *epb) 93 { 94 struct sctp_association *asoc; 95 struct sctp_sockaddr_entry *laddr; 96 struct sctp_transport *peer; 97 union sctp_addr *addr, *primary = NULL; 98 struct sctp_af *af; 99 100 if (epb->type == SCTP_EP_TYPE_ASSOCIATION) { 101 asoc = sctp_assoc(epb); 102 103 peer = asoc->peer.primary_path; 104 if (unlikely(peer == NULL)) { 105 WARN(1, "Association %p with NULL primary path!\n", asoc); 106 return; 107 } 108 109 primary = &peer->saddr; 110 } 111 112 rcu_read_lock(); 113 list_for_each_entry_rcu(laddr, &epb->bind_addr.address_list, list) { 114 if (!laddr->valid) 115 continue; 116 117 addr = &laddr->a; 118 af = sctp_get_af_specific(addr->sa.sa_family); 119 if (primary && af->cmp_addr(addr, primary)) { 120 seq_printf(seq, "*"); 121 } 122 af->seq_dump_addr(seq, addr); 123 } 124 rcu_read_unlock(); 125 } 126 127 /* Dump remote addresses of an association. */ 128 static void sctp_seq_dump_remote_addrs(struct seq_file *seq, struct sctp_association *assoc) 129 { 130 struct sctp_transport *transport; 131 union sctp_addr *addr, *primary; 132 struct sctp_af *af; 133 134 primary = &assoc->peer.primary_addr; 135 list_for_each_entry_rcu(transport, &assoc->peer.transport_addr_list, 136 transports) { 137 addr = &transport->ipaddr; 138 139 af = sctp_get_af_specific(addr->sa.sa_family); 140 if (af->cmp_addr(addr, primary)) { 141 seq_printf(seq, "*"); 142 } 143 af->seq_dump_addr(seq, addr); 144 } 145 } 146 147 static void *sctp_eps_seq_start(struct seq_file *seq, loff_t *pos) 148 { 149 if (*pos >= sctp_ep_hashsize) 150 return NULL; 151 152 if (*pos < 0) 153 *pos = 0; 154 155 if (*pos == 0) 156 seq_printf(seq, " ENDPT SOCK STY SST HBKT LPORT UID INODE LADDRS\n"); 157 158 return (void *)pos; 159 } 160 161 static void sctp_eps_seq_stop(struct seq_file *seq, void *v) 162 { 163 } 164 165 166 static void *sctp_eps_seq_next(struct seq_file *seq, void *v, loff_t *pos) 167 { 168 if (++*pos >= sctp_ep_hashsize) 169 return NULL; 170 171 return pos; 172 } 173 174 175 /* Display sctp endpoints (/proc/net/sctp/eps). */ 176 static int sctp_eps_seq_show(struct seq_file *seq, void *v) 177 { 178 struct sctp_hashbucket *head; 179 struct sctp_ep_common *epb; 180 struct sctp_endpoint *ep; 181 struct sock *sk; 182 int hash = *(loff_t *)v; 183 184 if (hash >= sctp_ep_hashsize) 185 return -ENOMEM; 186 187 head = &sctp_ep_hashtable[hash]; 188 read_lock_bh(&head->lock); 189 sctp_for_each_hentry(epb, &head->chain) { 190 ep = sctp_ep(epb); 191 sk = epb->sk; 192 if (!net_eq(sock_net(sk), seq_file_net(seq))) 193 continue; 194 seq_printf(seq, "%8pK %8pK %-3d %-3d %-4d %-5d %5u %5lu ", ep, sk, 195 sctp_sk(sk)->type, sk->sk_state, hash, 196 epb->bind_addr.port, 197 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sk)), 198 sock_i_ino(sk)); 199 200 sctp_seq_dump_local_addrs(seq, epb); 201 seq_printf(seq, "\n"); 202 } 203 read_unlock_bh(&head->lock); 204 205 return 0; 206 } 207 208 static const struct seq_operations sctp_eps_ops = { 209 .start = sctp_eps_seq_start, 210 .next = sctp_eps_seq_next, 211 .stop = sctp_eps_seq_stop, 212 .show = sctp_eps_seq_show, 213 }; 214 215 struct sctp_ht_iter { 216 struct seq_net_private p; 217 struct rhashtable_iter hti; 218 int start_fail; 219 }; 220 221 static void *sctp_transport_seq_start(struct seq_file *seq, loff_t *pos) 222 { 223 struct sctp_ht_iter *iter = seq->private; 224 225 sctp_transport_walk_start(&iter->hti); 226 227 iter->start_fail = 0; 228 return sctp_transport_get_idx(seq_file_net(seq), &iter->hti, *pos); 229 } 230 231 static void sctp_transport_seq_stop(struct seq_file *seq, void *v) 232 { 233 struct sctp_ht_iter *iter = seq->private; 234 235 if (iter->start_fail) 236 return; 237 sctp_transport_walk_stop(&iter->hti); 238 } 239 240 static void *sctp_transport_seq_next(struct seq_file *seq, void *v, loff_t *pos) 241 { 242 struct sctp_ht_iter *iter = seq->private; 243 244 ++*pos; 245 246 return sctp_transport_get_next(seq_file_net(seq), &iter->hti); 247 } 248 249 /* Display sctp associations (/proc/net/sctp/assocs). */ 250 static int sctp_assocs_seq_show(struct seq_file *seq, void *v) 251 { 252 struct sctp_transport *transport; 253 struct sctp_association *assoc; 254 struct sctp_ep_common *epb; 255 struct sock *sk; 256 257 if (v == SEQ_START_TOKEN) { 258 seq_printf(seq, " ASSOC SOCK STY SST ST HBKT " 259 "ASSOC-ID TX_QUEUE RX_QUEUE UID INODE LPORT " 260 "RPORT LADDRS <-> RADDRS " 261 "HBINT INS OUTS MAXRT T1X T2X RTXC " 262 "wmema wmemq sndbuf rcvbuf\n"); 263 return 0; 264 } 265 266 transport = (struct sctp_transport *)v; 267 if (!sctp_transport_hold(transport)) 268 return 0; 269 assoc = transport->asoc; 270 epb = &assoc->base; 271 sk = epb->sk; 272 273 seq_printf(seq, 274 "%8pK %8pK %-3d %-3d %-2d %-4d " 275 "%4d %8d %8d %7u %5lu %-5d %5d ", 276 assoc, sk, sctp_sk(sk)->type, sk->sk_state, 277 assoc->state, 0, 278 assoc->assoc_id, 279 assoc->sndbuf_used, 280 atomic_read(&assoc->rmem_alloc), 281 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sk)), 282 sock_i_ino(sk), 283 epb->bind_addr.port, 284 assoc->peer.port); 285 seq_printf(seq, " "); 286 sctp_seq_dump_local_addrs(seq, epb); 287 seq_printf(seq, "<-> "); 288 sctp_seq_dump_remote_addrs(seq, assoc); 289 seq_printf(seq, "\t%8lu %5d %5d %4d %4d %4d %8d " 290 "%8d %8d %8d %8d", 291 assoc->hbinterval, assoc->stream.incnt, 292 assoc->stream.outcnt, assoc->max_retrans, 293 assoc->init_retries, assoc->shutdown_retries, 294 assoc->rtx_data_chunks, 295 refcount_read(&sk->sk_wmem_alloc), 296 sk->sk_wmem_queued, 297 sk->sk_sndbuf, 298 sk->sk_rcvbuf); 299 seq_printf(seq, "\n"); 300 301 sctp_transport_put(transport); 302 303 return 0; 304 } 305 306 static const struct seq_operations sctp_assoc_ops = { 307 .start = sctp_transport_seq_start, 308 .next = sctp_transport_seq_next, 309 .stop = sctp_transport_seq_stop, 310 .show = sctp_assocs_seq_show, 311 }; 312 313 static int sctp_remaddr_seq_show(struct seq_file *seq, void *v) 314 { 315 struct sctp_association *assoc; 316 struct sctp_transport *transport, *tsp; 317 318 if (v == SEQ_START_TOKEN) { 319 seq_printf(seq, "ADDR ASSOC_ID HB_ACT RTO MAX_PATH_RTX " 320 "REM_ADDR_RTX START STATE\n"); 321 return 0; 322 } 323 324 transport = (struct sctp_transport *)v; 325 if (!sctp_transport_hold(transport)) 326 return 0; 327 assoc = transport->asoc; 328 329 list_for_each_entry_rcu(tsp, &assoc->peer.transport_addr_list, 330 transports) { 331 /* 332 * The remote address (ADDR) 333 */ 334 tsp->af_specific->seq_dump_addr(seq, &tsp->ipaddr); 335 seq_printf(seq, " "); 336 /* 337 * The association ID (ASSOC_ID) 338 */ 339 seq_printf(seq, "%d ", tsp->asoc->assoc_id); 340 341 /* 342 * If the Heartbeat is active (HB_ACT) 343 * Note: 1 = Active, 0 = Inactive 344 */ 345 seq_printf(seq, "%d ", timer_pending(&tsp->hb_timer)); 346 347 /* 348 * Retransmit time out (RTO) 349 */ 350 seq_printf(seq, "%lu ", tsp->rto); 351 352 /* 353 * Maximum path retransmit count (PATH_MAX_RTX) 354 */ 355 seq_printf(seq, "%d ", tsp->pathmaxrxt); 356 357 /* 358 * remote address retransmit count (REM_ADDR_RTX) 359 * Note: We don't have a way to tally this at the moment 360 * so lets just leave it as zero for the moment 361 */ 362 seq_puts(seq, "0 "); 363 364 /* 365 * remote address start time (START). This is also not 366 * currently implemented, but we can record it with a 367 * jiffies marker in a subsequent patch 368 */ 369 seq_puts(seq, "0 "); 370 371 /* 372 * The current state of this destination. I.e. 373 * SCTP_ACTIVE, SCTP_INACTIVE, ... 374 */ 375 seq_printf(seq, "%d", tsp->state); 376 377 seq_printf(seq, "\n"); 378 } 379 380 sctp_transport_put(transport); 381 382 return 0; 383 } 384 385 static const struct seq_operations sctp_remaddr_ops = { 386 .start = sctp_transport_seq_start, 387 .next = sctp_transport_seq_next, 388 .stop = sctp_transport_seq_stop, 389 .show = sctp_remaddr_seq_show, 390 }; 391 392 /* Set up the proc fs entry for the SCTP protocol. */ 393 int __net_init sctp_proc_init(struct net *net) 394 { 395 net->sctp.proc_net_sctp = proc_net_mkdir(net, "sctp", net->proc_net); 396 if (!net->sctp.proc_net_sctp) 397 return -ENOMEM; 398 if (!proc_create_net_single("snmp", 0444, net->sctp.proc_net_sctp, 399 sctp_snmp_seq_show, NULL)) 400 goto cleanup; 401 if (!proc_create_net("eps", 0444, net->sctp.proc_net_sctp, 402 &sctp_eps_ops, sizeof(struct seq_net_private))) 403 goto cleanup; 404 if (!proc_create_net("assocs", 0444, net->sctp.proc_net_sctp, 405 &sctp_assoc_ops, sizeof(struct sctp_ht_iter))) 406 goto cleanup; 407 if (!proc_create_net("remaddr", 0444, net->sctp.proc_net_sctp, 408 &sctp_remaddr_ops, sizeof(struct sctp_ht_iter))) 409 goto cleanup; 410 return 0; 411 412 cleanup: 413 remove_proc_subtree("sctp", net->proc_net); 414 net->sctp.proc_net_sctp = NULL; 415 return -ENOMEM; 416 } 417