1// SPDX-License-Identifier: GPL-2.0-or-later 2/* SCTP kernel implementation 3 * Copyright (c) 2003 International Business Machines, Corp. 4 * 5 * This file is part of the SCTP kernel implementation 6 * 7 * Please send any bug reports or fixes you make to the 8 * email address(es): 9 * lksctp developers <linux-sctp@vger.kernel.org> 10 * 11 * Written or modified by: 12 * Sridhar Samudrala <sri@us.ibm.com> 13 */ 14 15#include <linux/types.h> 16#include <linux/seq_file.h> 17#include <linux/init.h> 18#include <linux/export.h> 19#include <net/sctp/sctp.h> 20#include <net/ip.h> /* for snmp_fold_field */ 21 22static const struct snmp_mib sctp_snmp_list[] = { 23 SNMP_MIB_ITEM("SctpCurrEstab", SCTP_MIB_CURRESTAB), 24 SNMP_MIB_ITEM("SctpActiveEstabs", SCTP_MIB_ACTIVEESTABS), 25 SNMP_MIB_ITEM("SctpPassiveEstabs", SCTP_MIB_PASSIVEESTABS), 26 SNMP_MIB_ITEM("SctpAborteds", SCTP_MIB_ABORTEDS), 27 SNMP_MIB_ITEM("SctpShutdowns", SCTP_MIB_SHUTDOWNS), 28 SNMP_MIB_ITEM("SctpOutOfBlues", SCTP_MIB_OUTOFBLUES), 29 SNMP_MIB_ITEM("SctpChecksumErrors", SCTP_MIB_CHECKSUMERRORS), 30 SNMP_MIB_ITEM("SctpOutCtrlChunks", SCTP_MIB_OUTCTRLCHUNKS), 31 SNMP_MIB_ITEM("SctpOutOrderChunks", SCTP_MIB_OUTORDERCHUNKS), 32 SNMP_MIB_ITEM("SctpOutUnorderChunks", SCTP_MIB_OUTUNORDERCHUNKS), 33 SNMP_MIB_ITEM("SctpInCtrlChunks", SCTP_MIB_INCTRLCHUNKS), 34 SNMP_MIB_ITEM("SctpInOrderChunks", SCTP_MIB_INORDERCHUNKS), 35 SNMP_MIB_ITEM("SctpInUnorderChunks", SCTP_MIB_INUNORDERCHUNKS), 36 SNMP_MIB_ITEM("SctpFragUsrMsgs", SCTP_MIB_FRAGUSRMSGS), 37 SNMP_MIB_ITEM("SctpReasmUsrMsgs", SCTP_MIB_REASMUSRMSGS), 38 SNMP_MIB_ITEM("SctpOutSCTPPacks", SCTP_MIB_OUTSCTPPACKS), 39 SNMP_MIB_ITEM("SctpInSCTPPacks", SCTP_MIB_INSCTPPACKS), 40 SNMP_MIB_ITEM("SctpT1InitExpireds", SCTP_MIB_T1_INIT_EXPIREDS), 41 SNMP_MIB_ITEM("SctpT1CookieExpireds", SCTP_MIB_T1_COOKIE_EXPIREDS), 42 SNMP_MIB_ITEM("SctpT2ShutdownExpireds", SCTP_MIB_T2_SHUTDOWN_EXPIREDS), 43 SNMP_MIB_ITEM("SctpT3RtxExpireds", SCTP_MIB_T3_RTX_EXPIREDS), 44 SNMP_MIB_ITEM("SctpT4RtoExpireds", SCTP_MIB_T4_RTO_EXPIREDS), 45 SNMP_MIB_ITEM("SctpT5ShutdownGuardExpireds", SCTP_MIB_T5_SHUTDOWN_GUARD_EXPIREDS), 46 SNMP_MIB_ITEM("SctpDelaySackExpireds", SCTP_MIB_DELAY_SACK_EXPIREDS), 47 SNMP_MIB_ITEM("SctpAutocloseExpireds", SCTP_MIB_AUTOCLOSE_EXPIREDS), 48 SNMP_MIB_ITEM("SctpT3Retransmits", SCTP_MIB_T3_RETRANSMITS), 49 SNMP_MIB_ITEM("SctpPmtudRetransmits", SCTP_MIB_PMTUD_RETRANSMITS), 50 SNMP_MIB_ITEM("SctpFastRetransmits", SCTP_MIB_FAST_RETRANSMITS), 51 SNMP_MIB_ITEM("SctpInPktSoftirq", SCTP_MIB_IN_PKT_SOFTIRQ), 52 SNMP_MIB_ITEM("SctpInPktBacklog", SCTP_MIB_IN_PKT_BACKLOG), 53 SNMP_MIB_ITEM("SctpInPktDiscards", SCTP_MIB_IN_PKT_DISCARDS), 54 SNMP_MIB_ITEM("SctpInDataChunkDiscards", SCTP_MIB_IN_DATA_CHUNK_DISCARDS), 55 SNMP_MIB_SENTINEL 56}; 57 58/* Display sctp snmp mib statistics(/proc/net/sctp/snmp). */ 59static int sctp_snmp_seq_show(struct seq_file *seq, void *v) 60{ 61 unsigned long buff[SCTP_MIB_MAX]; 62 struct net *net = seq->private; 63 int i; 64 65 memset(buff, 0, sizeof(unsigned long) * SCTP_MIB_MAX); 66 67 snmp_get_cpu_field_batch(buff, sctp_snmp_list, 68 net->sctp.sctp_statistics); 69 for (i = 0; sctp_snmp_list[i].name; i++) 70 seq_printf(seq, "%-32s\t%ld\n", sctp_snmp_list[i].name, 71 buff[i]); 72 73 return 0; 74} 75 76/* Dump local addresses of an association/endpoint. */ 77static void sctp_seq_dump_local_addrs(struct seq_file *seq, struct sctp_ep_common *epb) 78{ 79 struct sctp_association *asoc; 80 struct sctp_sockaddr_entry *laddr; 81 struct sctp_transport *peer; 82 union sctp_addr *addr, *primary = NULL; 83 struct sctp_af *af; 84 85 if (epb->type == SCTP_EP_TYPE_ASSOCIATION) { 86 asoc = sctp_assoc(epb); 87 88 peer = asoc->peer.primary_path; 89 if (unlikely(peer == NULL)) { 90 WARN(1, "Association %p with NULL primary path!\n", asoc); 91 return; 92 } 93 94 primary = &peer->saddr; 95 } 96 97 rcu_read_lock(); 98 list_for_each_entry_rcu(laddr, &epb->bind_addr.address_list, list) { 99 if (!laddr->valid) 100 continue; 101 102 addr = &laddr->a; 103 af = sctp_get_af_specific(addr->sa.sa_family); 104 if (primary && af->cmp_addr(addr, primary)) { 105 seq_printf(seq, "*"); 106 } 107 af->seq_dump_addr(seq, addr); 108 } 109 rcu_read_unlock(); 110} 111 112/* Dump remote addresses of an association. */ 113static void sctp_seq_dump_remote_addrs(struct seq_file *seq, struct sctp_association *assoc) 114{ 115 struct sctp_transport *transport; 116 union sctp_addr *addr, *primary; 117 struct sctp_af *af; 118 119 primary = &assoc->peer.primary_addr; 120 list_for_each_entry_rcu(transport, &assoc->peer.transport_addr_list, 121 transports) { 122 addr = &transport->ipaddr; 123 124 af = sctp_get_af_specific(addr->sa.sa_family); 125 if (af->cmp_addr(addr, primary)) { 126 seq_printf(seq, "*"); 127 } 128 af->seq_dump_addr(seq, addr); 129 } 130} 131 132static void *sctp_eps_seq_start(struct seq_file *seq, loff_t *pos) 133{ 134 if (*pos >= sctp_ep_hashsize) 135 return NULL; 136 137 if (*pos < 0) 138 *pos = 0; 139 140 if (*pos == 0) 141 seq_printf(seq, " ENDPT SOCK STY SST HBKT LPORT UID INODE LADDRS\n"); 142 143 return (void *)pos; 144} 145 146static void sctp_eps_seq_stop(struct seq_file *seq, void *v) 147{ 148} 149 150 151static void *sctp_eps_seq_next(struct seq_file *seq, void *v, loff_t *pos) 152{ 153 if (++*pos >= sctp_ep_hashsize) 154 return NULL; 155 156 return pos; 157} 158 159 160/* Display sctp endpoints (/proc/net/sctp/eps). */ 161static int sctp_eps_seq_show(struct seq_file *seq, void *v) 162{ 163 struct sctp_hashbucket *head; 164 struct sctp_ep_common *epb; 165 struct sctp_endpoint *ep; 166 struct sock *sk; 167 int hash = *(loff_t *)v; 168 169 if (hash >= sctp_ep_hashsize) 170 return -ENOMEM; 171 172 head = &sctp_ep_hashtable[hash]; 173 read_lock_bh(&head->lock); 174 sctp_for_each_hentry(epb, &head->chain) { 175 ep = sctp_ep(epb); 176 sk = epb->sk; 177 if (!net_eq(sock_net(sk), seq_file_net(seq))) 178 continue; 179 seq_printf(seq, "%8pK %8pK %-3d %-3d %-4d %-5d %5u %5lu ", ep, sk, 180 sctp_sk(sk)->type, sk->sk_state, hash, 181 epb->bind_addr.port, 182 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sk)), 183 sock_i_ino(sk)); 184 185 sctp_seq_dump_local_addrs(seq, epb); 186 seq_printf(seq, "\n"); 187 } 188 read_unlock_bh(&head->lock); 189 190 return 0; 191} 192 193static const struct seq_operations sctp_eps_ops = { 194 .start = sctp_eps_seq_start, 195 .next = sctp_eps_seq_next, 196 .stop = sctp_eps_seq_stop, 197 .show = sctp_eps_seq_show, 198}; 199 200struct sctp_ht_iter { 201 struct seq_net_private p; 202 struct rhashtable_iter hti; 203}; 204 205static void *sctp_transport_seq_start(struct seq_file *seq, loff_t *pos) 206{ 207 struct sctp_ht_iter *iter = seq->private; 208 209 sctp_transport_walk_start(&iter->hti); 210 211 return sctp_transport_get_idx(seq_file_net(seq), &iter->hti, *pos); 212} 213 214static void sctp_transport_seq_stop(struct seq_file *seq, void *v) 215{ 216 struct sctp_ht_iter *iter = seq->private; 217 218 if (v && v != SEQ_START_TOKEN) { 219 struct sctp_transport *transport = v; 220 221 sctp_transport_put(transport); 222 } 223 224 sctp_transport_walk_stop(&iter->hti); 225} 226 227static void *sctp_transport_seq_next(struct seq_file *seq, void *v, loff_t *pos) 228{ 229 struct sctp_ht_iter *iter = seq->private; 230 231 if (v && v != SEQ_START_TOKEN) { 232 struct sctp_transport *transport = v; 233 234 sctp_transport_put(transport); 235 } 236 237 ++*pos; 238 239 return sctp_transport_get_next(seq_file_net(seq), &iter->hti); 240} 241 242/* Display sctp associations (/proc/net/sctp/assocs). */ 243static int sctp_assocs_seq_show(struct seq_file *seq, void *v) 244{ 245 struct sctp_transport *transport; 246 struct sctp_association *assoc; 247 struct sctp_ep_common *epb; 248 struct sock *sk; 249 250 if (v == SEQ_START_TOKEN) { 251 seq_printf(seq, " ASSOC SOCK STY SST ST HBKT " 252 "ASSOC-ID TX_QUEUE RX_QUEUE UID INODE LPORT " 253 "RPORT LADDRS <-> RADDRS " 254 "HBINT INS OUTS MAXRT T1X T2X RTXC " 255 "wmema wmemq sndbuf rcvbuf\n"); 256 return 0; 257 } 258 259 transport = (struct sctp_transport *)v; 260 assoc = transport->asoc; 261 epb = &assoc->base; 262 sk = epb->sk; 263 264 seq_printf(seq, 265 "%8pK %8pK %-3d %-3d %-2d %-4d " 266 "%4d %8d %8d %7u %5lu %-5d %5d ", 267 assoc, sk, sctp_sk(sk)->type, sk->sk_state, 268 assoc->state, 0, 269 assoc->assoc_id, 270 assoc->sndbuf_used, 271 atomic_read(&assoc->rmem_alloc), 272 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sk)), 273 sock_i_ino(sk), 274 epb->bind_addr.port, 275 assoc->peer.port); 276 seq_printf(seq, " "); 277 sctp_seq_dump_local_addrs(seq, epb); 278 seq_printf(seq, "<-> "); 279 sctp_seq_dump_remote_addrs(seq, assoc); 280 seq_printf(seq, "\t%8lu %5d %5d %4d %4d %4d %8d " 281 "%8d %8d %8d %8d", 282 assoc->hbinterval, assoc->stream.incnt, 283 assoc->stream.outcnt, assoc->max_retrans, 284 assoc->init_retries, assoc->shutdown_retries, 285 assoc->rtx_data_chunks, 286 refcount_read(&sk->sk_wmem_alloc), 287 READ_ONCE(sk->sk_wmem_queued), 288 sk->sk_sndbuf, 289 sk->sk_rcvbuf); 290 seq_printf(seq, "\n"); 291 292 return 0; 293} 294 295static const struct seq_operations sctp_assoc_ops = { 296 .start = sctp_transport_seq_start, 297 .next = sctp_transport_seq_next, 298 .stop = sctp_transport_seq_stop, 299 .show = sctp_assocs_seq_show, 300}; 301 302static int sctp_remaddr_seq_show(struct seq_file *seq, void *v) 303{ 304 struct sctp_association *assoc; 305 struct sctp_transport *transport, *tsp; 306 307 if (v == SEQ_START_TOKEN) { 308 seq_printf(seq, "ADDR ASSOC_ID HB_ACT RTO MAX_PATH_RTX " 309 "REM_ADDR_RTX START STATE\n"); 310 return 0; 311 } 312 313 transport = (struct sctp_transport *)v; 314 assoc = transport->asoc; 315 316 list_for_each_entry_rcu(tsp, &assoc->peer.transport_addr_list, 317 transports) { 318 /* 319 * The remote address (ADDR) 320 */ 321 tsp->af_specific->seq_dump_addr(seq, &tsp->ipaddr); 322 seq_printf(seq, " "); 323 /* 324 * The association ID (ASSOC_ID) 325 */ 326 seq_printf(seq, "%d ", tsp->asoc->assoc_id); 327 328 /* 329 * If the Heartbeat is active (HB_ACT) 330 * Note: 1 = Active, 0 = Inactive 331 */ 332 seq_printf(seq, "%d ", timer_pending(&tsp->hb_timer)); 333 334 /* 335 * Retransmit time out (RTO) 336 */ 337 seq_printf(seq, "%lu ", tsp->rto); 338 339 /* 340 * Maximum path retransmit count (PATH_MAX_RTX) 341 */ 342 seq_printf(seq, "%d ", tsp->pathmaxrxt); 343 344 /* 345 * remote address retransmit count (REM_ADDR_RTX) 346 * Note: We don't have a way to tally this at the moment 347 * so lets just leave it as zero for the moment 348 */ 349 seq_puts(seq, "0 "); 350 351 /* 352 * remote address start time (START). This is also not 353 * currently implemented, but we can record it with a 354 * jiffies marker in a subsequent patch 355 */ 356 seq_puts(seq, "0 "); 357 358 /* 359 * The current state of this destination. I.e. 360 * SCTP_ACTIVE, SCTP_INACTIVE, ... 361 */ 362 seq_printf(seq, "%d", tsp->state); 363 364 seq_printf(seq, "\n"); 365 } 366 367 return 0; 368} 369 370static const struct seq_operations sctp_remaddr_ops = { 371 .start = sctp_transport_seq_start, 372 .next = sctp_transport_seq_next, 373 .stop = sctp_transport_seq_stop, 374 .show = sctp_remaddr_seq_show, 375}; 376 377/* Set up the proc fs entry for the SCTP protocol. */ 378int __net_init sctp_proc_init(struct net *net) 379{ 380 net->sctp.proc_net_sctp = proc_net_mkdir(net, "sctp", net->proc_net); 381 if (!net->sctp.proc_net_sctp) 382 return -ENOMEM; 383 if (!proc_create_net_single("snmp", 0444, net->sctp.proc_net_sctp, 384 sctp_snmp_seq_show, NULL)) 385 goto cleanup; 386 if (!proc_create_net("eps", 0444, net->sctp.proc_net_sctp, 387 &sctp_eps_ops, sizeof(struct seq_net_private))) 388 goto cleanup; 389 if (!proc_create_net("assocs", 0444, net->sctp.proc_net_sctp, 390 &sctp_assoc_ops, sizeof(struct sctp_ht_iter))) 391 goto cleanup; 392 if (!proc_create_net("remaddr", 0444, net->sctp.proc_net_sctp, 393 &sctp_remaddr_ops, sizeof(struct sctp_ht_iter))) 394 goto cleanup; 395 return 0; 396 397cleanup: 398 remove_proc_subtree("sctp", net->proc_net); 399 net->sctp.proc_net_sctp = NULL; 400 return -ENOMEM; 401} 402