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 }; 219 220 static void *sctp_transport_seq_start(struct seq_file *seq, loff_t *pos) 221 { 222 struct sctp_ht_iter *iter = seq->private; 223 224 sctp_transport_walk_start(&iter->hti); 225 226 return sctp_transport_get_idx(seq_file_net(seq), &iter->hti, *pos); 227 } 228 229 static void sctp_transport_seq_stop(struct seq_file *seq, void *v) 230 { 231 struct sctp_ht_iter *iter = seq->private; 232 233 sctp_transport_walk_stop(&iter->hti); 234 } 235 236 static void *sctp_transport_seq_next(struct seq_file *seq, void *v, loff_t *pos) 237 { 238 struct sctp_ht_iter *iter = seq->private; 239 240 ++*pos; 241 242 return sctp_transport_get_next(seq_file_net(seq), &iter->hti); 243 } 244 245 /* Display sctp associations (/proc/net/sctp/assocs). */ 246 static int sctp_assocs_seq_show(struct seq_file *seq, void *v) 247 { 248 struct sctp_transport *transport; 249 struct sctp_association *assoc; 250 struct sctp_ep_common *epb; 251 struct sock *sk; 252 253 if (v == SEQ_START_TOKEN) { 254 seq_printf(seq, " ASSOC SOCK STY SST ST HBKT " 255 "ASSOC-ID TX_QUEUE RX_QUEUE UID INODE LPORT " 256 "RPORT LADDRS <-> RADDRS " 257 "HBINT INS OUTS MAXRT T1X T2X RTXC " 258 "wmema wmemq sndbuf rcvbuf\n"); 259 return 0; 260 } 261 262 transport = (struct sctp_transport *)v; 263 assoc = transport->asoc; 264 epb = &assoc->base; 265 sk = epb->sk; 266 267 seq_printf(seq, 268 "%8pK %8pK %-3d %-3d %-2d %-4d " 269 "%4d %8d %8d %7u %5lu %-5d %5d ", 270 assoc, sk, sctp_sk(sk)->type, sk->sk_state, 271 assoc->state, 0, 272 assoc->assoc_id, 273 assoc->sndbuf_used, 274 atomic_read(&assoc->rmem_alloc), 275 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sk)), 276 sock_i_ino(sk), 277 epb->bind_addr.port, 278 assoc->peer.port); 279 seq_printf(seq, " "); 280 sctp_seq_dump_local_addrs(seq, epb); 281 seq_printf(seq, "<-> "); 282 sctp_seq_dump_remote_addrs(seq, assoc); 283 seq_printf(seq, "\t%8lu %5d %5d %4d %4d %4d %8d " 284 "%8d %8d %8d %8d", 285 assoc->hbinterval, assoc->stream.incnt, 286 assoc->stream.outcnt, assoc->max_retrans, 287 assoc->init_retries, assoc->shutdown_retries, 288 assoc->rtx_data_chunks, 289 refcount_read(&sk->sk_wmem_alloc), 290 sk->sk_wmem_queued, 291 sk->sk_sndbuf, 292 sk->sk_rcvbuf); 293 seq_printf(seq, "\n"); 294 295 sctp_transport_put(transport); 296 297 return 0; 298 } 299 300 static const struct seq_operations sctp_assoc_ops = { 301 .start = sctp_transport_seq_start, 302 .next = sctp_transport_seq_next, 303 .stop = sctp_transport_seq_stop, 304 .show = sctp_assocs_seq_show, 305 }; 306 307 static int sctp_remaddr_seq_show(struct seq_file *seq, void *v) 308 { 309 struct sctp_association *assoc; 310 struct sctp_transport *transport, *tsp; 311 312 if (v == SEQ_START_TOKEN) { 313 seq_printf(seq, "ADDR ASSOC_ID HB_ACT RTO MAX_PATH_RTX " 314 "REM_ADDR_RTX START STATE\n"); 315 return 0; 316 } 317 318 transport = (struct sctp_transport *)v; 319 assoc = transport->asoc; 320 321 list_for_each_entry_rcu(tsp, &assoc->peer.transport_addr_list, 322 transports) { 323 /* 324 * The remote address (ADDR) 325 */ 326 tsp->af_specific->seq_dump_addr(seq, &tsp->ipaddr); 327 seq_printf(seq, " "); 328 /* 329 * The association ID (ASSOC_ID) 330 */ 331 seq_printf(seq, "%d ", tsp->asoc->assoc_id); 332 333 /* 334 * If the Heartbeat is active (HB_ACT) 335 * Note: 1 = Active, 0 = Inactive 336 */ 337 seq_printf(seq, "%d ", timer_pending(&tsp->hb_timer)); 338 339 /* 340 * Retransmit time out (RTO) 341 */ 342 seq_printf(seq, "%lu ", tsp->rto); 343 344 /* 345 * Maximum path retransmit count (PATH_MAX_RTX) 346 */ 347 seq_printf(seq, "%d ", tsp->pathmaxrxt); 348 349 /* 350 * remote address retransmit count (REM_ADDR_RTX) 351 * Note: We don't have a way to tally this at the moment 352 * so lets just leave it as zero for the moment 353 */ 354 seq_puts(seq, "0 "); 355 356 /* 357 * remote address start time (START). This is also not 358 * currently implemented, but we can record it with a 359 * jiffies marker in a subsequent patch 360 */ 361 seq_puts(seq, "0 "); 362 363 /* 364 * The current state of this destination. I.e. 365 * SCTP_ACTIVE, SCTP_INACTIVE, ... 366 */ 367 seq_printf(seq, "%d", tsp->state); 368 369 seq_printf(seq, "\n"); 370 } 371 372 sctp_transport_put(transport); 373 374 return 0; 375 } 376 377 static const struct seq_operations sctp_remaddr_ops = { 378 .start = sctp_transport_seq_start, 379 .next = sctp_transport_seq_next, 380 .stop = sctp_transport_seq_stop, 381 .show = sctp_remaddr_seq_show, 382 }; 383 384 /* Set up the proc fs entry for the SCTP protocol. */ 385 int __net_init sctp_proc_init(struct net *net) 386 { 387 net->sctp.proc_net_sctp = proc_net_mkdir(net, "sctp", net->proc_net); 388 if (!net->sctp.proc_net_sctp) 389 return -ENOMEM; 390 if (!proc_create_net_single("snmp", 0444, net->sctp.proc_net_sctp, 391 sctp_snmp_seq_show, NULL)) 392 goto cleanup; 393 if (!proc_create_net("eps", 0444, net->sctp.proc_net_sctp, 394 &sctp_eps_ops, sizeof(struct seq_net_private))) 395 goto cleanup; 396 if (!proc_create_net("assocs", 0444, net->sctp.proc_net_sctp, 397 &sctp_assoc_ops, sizeof(struct sctp_ht_iter))) 398 goto cleanup; 399 if (!proc_create_net("remaddr", 0444, net->sctp.proc_net_sctp, 400 &sctp_remaddr_ops, sizeof(struct sctp_ht_iter))) 401 goto cleanup; 402 return 0; 403 404 cleanup: 405 remove_proc_subtree("sctp", net->proc_net); 406 net->sctp.proc_net_sctp = NULL; 407 return -ENOMEM; 408 } 409