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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 <[email protected]>
10 *
11 * Written or modified by:
12 * Sridhar Samudrala <[email protected]>
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};
56
57/* Display sctp snmp mib statistics(/proc/net/sctp/snmp). */
58static int sctp_snmp_seq_show(struct seq_file *seq, void *v)
59{
60 unsigned long buff[ARRAY_SIZE(sctp_snmp_list)];
61 const int cnt = ARRAY_SIZE(sctp_snmp_list);
62 struct net *net = seq->private;
63 int i;
64
65 memset(buff, 0, sizeof(buff));
66
67 snmp_get_cpu_field_batch_cnt(buff, sctp_snmp_list, cnt,
68 net->sctp.sctp_statistics);
69 for (i = 0; i < cnt; 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_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 %5llu ", 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), sk_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
191static 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
198struct sctp_ht_iter {
199 struct seq_net_private p;
200 struct rhashtable_iter hti;
201};
202
203static 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
212static 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
225static 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). */
241static 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 %5llu %-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), sk_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 READ_ONCE(sk->sk_wmem_queued),
286 sk->sk_sndbuf,
287 sk->sk_rcvbuf);
288 seq_printf(seq, "\n");
289
290 return 0;
291}
292
293static 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
300static 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
368static 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. */
376int __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
395cleanup:
396 remove_proc_subtree("sctp", net->proc_net);
397 net->sctp.proc_net_sctp = NULL;
398 return -ENOMEM;
399}