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 22 static 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). */ 59 static 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. */ 77 static 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. */ 113 static 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 } 131 132 static 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 } 145 146 static void sctp_eps_seq_stop(struct seq_file *seq, void *v) 147 { 148 } 149 150 151 static 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). */ 161 static int sctp_eps_seq_show(struct seq_file *seq, void *v) 162 { 163 struct sctp_hashbucket *head; 164 struct sctp_endpoint *ep; 165 struct sock *sk; 166 int hash = *(loff_t *)v; 167 168 if (hash >= sctp_ep_hashsize) 169 return -ENOMEM; 170 171 head = &sctp_ep_hashtable[hash]; 172 read_lock_bh(&head->lock); 173 sctp_for_each_hentry(ep, &head->chain) { 174 sk = ep->base.sk; 175 if (!net_eq(sock_net(sk), seq_file_net(seq))) 176 continue; 177 seq_printf(seq, "%8pK %8pK %-3d %-3d %-4d %-5d %5u %5lu ", ep, sk, 178 sctp_sk(sk)->type, sk->sk_state, hash, 179 ep->base.bind_addr.port, 180 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sk)), 181 sock_i_ino(sk)); 182 183 sctp_seq_dump_local_addrs(seq, &ep->base); 184 seq_printf(seq, "\n"); 185 } 186 read_unlock_bh(&head->lock); 187 188 return 0; 189 } 190 191 static const struct seq_operations sctp_eps_ops = { 192 .start = sctp_eps_seq_start, 193 .next = sctp_eps_seq_next, 194 .stop = sctp_eps_seq_stop, 195 .show = sctp_eps_seq_show, 196 }; 197 198 struct sctp_ht_iter { 199 struct seq_net_private p; 200 struct rhashtable_iter hti; 201 }; 202 203 static void *sctp_transport_seq_start(struct seq_file *seq, loff_t *pos) 204 { 205 struct sctp_ht_iter *iter = seq->private; 206 207 sctp_transport_walk_start(&iter->hti); 208 209 return sctp_transport_get_idx(seq_file_net(seq), &iter->hti, *pos); 210 } 211 212 static void sctp_transport_seq_stop(struct seq_file *seq, void *v) 213 { 214 struct sctp_ht_iter *iter = seq->private; 215 216 if (v && v != SEQ_START_TOKEN) { 217 struct sctp_transport *transport = v; 218 219 sctp_transport_put(transport); 220 } 221 222 sctp_transport_walk_stop(&iter->hti); 223 } 224 225 static void *sctp_transport_seq_next(struct seq_file *seq, void *v, loff_t *pos) 226 { 227 struct sctp_ht_iter *iter = seq->private; 228 229 if (v && v != SEQ_START_TOKEN) { 230 struct sctp_transport *transport = v; 231 232 sctp_transport_put(transport); 233 } 234 235 ++*pos; 236 237 return sctp_transport_get_next(seq_file_net(seq), &iter->hti); 238 } 239 240 /* Display sctp associations (/proc/net/sctp/assocs). */ 241 static int sctp_assocs_seq_show(struct seq_file *seq, void *v) 242 { 243 struct sctp_transport *transport; 244 struct sctp_association *assoc; 245 struct sctp_ep_common *epb; 246 struct sock *sk; 247 248 if (v == SEQ_START_TOKEN) { 249 seq_printf(seq, " ASSOC SOCK STY SST ST HBKT " 250 "ASSOC-ID TX_QUEUE RX_QUEUE UID INODE LPORT " 251 "RPORT LADDRS <-> RADDRS " 252 "HBINT INS OUTS MAXRT T1X T2X RTXC " 253 "wmema wmemq sndbuf rcvbuf\n"); 254 return 0; 255 } 256 257 transport = (struct sctp_transport *)v; 258 assoc = transport->asoc; 259 epb = &assoc->base; 260 sk = epb->sk; 261 262 seq_printf(seq, 263 "%8pK %8pK %-3d %-3d %-2d %-4d " 264 "%4d %8d %8d %7u %5lu %-5d %5d ", 265 assoc, sk, sctp_sk(sk)->type, sk->sk_state, 266 assoc->state, 0, 267 assoc->assoc_id, 268 assoc->sndbuf_used, 269 atomic_read(&assoc->rmem_alloc), 270 from_kuid_munged(seq_user_ns(seq), sock_i_uid(sk)), 271 sock_i_ino(sk), 272 epb->bind_addr.port, 273 assoc->peer.port); 274 seq_printf(seq, " "); 275 sctp_seq_dump_local_addrs(seq, epb); 276 seq_printf(seq, "<-> "); 277 sctp_seq_dump_remote_addrs(seq, assoc); 278 seq_printf(seq, "\t%8lu %5d %5d %4d %4d %4d %8d " 279 "%8d %8d %8d %8d", 280 assoc->hbinterval, assoc->stream.incnt, 281 assoc->stream.outcnt, assoc->max_retrans, 282 assoc->init_retries, assoc->shutdown_retries, 283 assoc->rtx_data_chunks, 284 refcount_read(&sk->sk_wmem_alloc), 285 sk->sk_wmem_queued, 286 sk->sk_sndbuf, 287 sk->sk_rcvbuf); 288 seq_printf(seq, "\n"); 289 290 return 0; 291 } 292 293 static const struct seq_operations sctp_assoc_ops = { 294 .start = sctp_transport_seq_start, 295 .next = sctp_transport_seq_next, 296 .stop = sctp_transport_seq_stop, 297 .show = sctp_assocs_seq_show, 298 }; 299 300 static int sctp_remaddr_seq_show(struct seq_file *seq, void *v) 301 { 302 struct sctp_association *assoc; 303 struct sctp_transport *transport, *tsp; 304 305 if (v == SEQ_START_TOKEN) { 306 seq_printf(seq, "ADDR ASSOC_ID HB_ACT RTO MAX_PATH_RTX " 307 "REM_ADDR_RTX START STATE\n"); 308 return 0; 309 } 310 311 transport = (struct sctp_transport *)v; 312 assoc = transport->asoc; 313 314 list_for_each_entry_rcu(tsp, &assoc->peer.transport_addr_list, 315 transports) { 316 /* 317 * The remote address (ADDR) 318 */ 319 tsp->af_specific->seq_dump_addr(seq, &tsp->ipaddr); 320 seq_printf(seq, " "); 321 /* 322 * The association ID (ASSOC_ID) 323 */ 324 seq_printf(seq, "%d ", tsp->asoc->assoc_id); 325 326 /* 327 * If the Heartbeat is active (HB_ACT) 328 * Note: 1 = Active, 0 = Inactive 329 */ 330 seq_printf(seq, "%d ", timer_pending(&tsp->hb_timer)); 331 332 /* 333 * Retransmit time out (RTO) 334 */ 335 seq_printf(seq, "%lu ", tsp->rto); 336 337 /* 338 * Maximum path retransmit count (PATH_MAX_RTX) 339 */ 340 seq_printf(seq, "%d ", tsp->pathmaxrxt); 341 342 /* 343 * remote address retransmit count (REM_ADDR_RTX) 344 * Note: We don't have a way to tally this at the moment 345 * so lets just leave it as zero for the moment 346 */ 347 seq_puts(seq, "0 "); 348 349 /* 350 * remote address start time (START). This is also not 351 * currently implemented, but we can record it with a 352 * jiffies marker in a subsequent patch 353 */ 354 seq_puts(seq, "0 "); 355 356 /* 357 * The current state of this destination. I.e. 358 * SCTP_ACTIVE, SCTP_INACTIVE, ... 359 */ 360 seq_printf(seq, "%d", tsp->state); 361 362 seq_printf(seq, "\n"); 363 } 364 365 return 0; 366 } 367 368 static const struct seq_operations sctp_remaddr_ops = { 369 .start = sctp_transport_seq_start, 370 .next = sctp_transport_seq_next, 371 .stop = sctp_transport_seq_stop, 372 .show = sctp_remaddr_seq_show, 373 }; 374 375 /* Set up the proc fs entry for the SCTP protocol. */ 376 int __net_init sctp_proc_init(struct net *net) 377 { 378 net->sctp.proc_net_sctp = proc_net_mkdir(net, "sctp", net->proc_net); 379 if (!net->sctp.proc_net_sctp) 380 return -ENOMEM; 381 if (!proc_create_net_single("snmp", 0444, net->sctp.proc_net_sctp, 382 sctp_snmp_seq_show, NULL)) 383 goto cleanup; 384 if (!proc_create_net("eps", 0444, net->sctp.proc_net_sctp, 385 &sctp_eps_ops, sizeof(struct seq_net_private))) 386 goto cleanup; 387 if (!proc_create_net("assocs", 0444, net->sctp.proc_net_sctp, 388 &sctp_assoc_ops, sizeof(struct sctp_ht_iter))) 389 goto cleanup; 390 if (!proc_create_net("remaddr", 0444, net->sctp.proc_net_sctp, 391 &sctp_remaddr_ops, sizeof(struct sctp_ht_iter))) 392 goto cleanup; 393 return 0; 394 395 cleanup: 396 remove_proc_subtree("sctp", net->proc_net); 397 net->sctp.proc_net_sctp = NULL; 398 return -ENOMEM; 399 } 400