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