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47505b8b | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
60c778b2 | 2 | /* SCTP kernel implementation |
1da177e4 LT |
3 | * Copyright (c) 2003 International Business Machines, Corp. |
4 | * | |
60c778b2 | 5 | * This file is part of the SCTP kernel implementation |
1da177e4 | 6 | * |
1da177e4 LT |
7 | * Please send any bug reports or fixes you make to the |
8 | * email address(es): | |
91705c61 | 9 | * lksctp developers <linux-sctp@vger.kernel.org> |
1da177e4 | 10 | * |
1da177e4 LT |
11 | * Written or modified by: |
12 | * Sridhar Samudrala <sri@us.ibm.com> | |
1da177e4 LT |
13 | */ |
14 | ||
15 | #include <linux/types.h> | |
16 | #include <linux/seq_file.h> | |
17 | #include <linux/init.h> | |
bc3b2d7f | 18 | #include <linux/export.h> |
1da177e4 | 19 | #include <net/sctp/sctp.h> |
3f5340a6 | 20 | #include <net/ip.h> /* for snmp_fold_field */ |
1da177e4 | 21 | |
5833929c | 22 | static const struct snmp_mib sctp_snmp_list[] = { |
1da177e4 LT |
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), | |
ac0b0462 SS |
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), | |
d2287f84 | 55 | SNMP_MIB_SENTINEL |
1da177e4 LT |
56 | }; |
57 | ||
1da177e4 LT |
58 | /* Display sctp snmp mib statistics(/proc/net/sctp/snmp). */ |
59 | static int sctp_snmp_seq_show(struct seq_file *seq, void *v) | |
60 | { | |
7d64a94b | 61 | unsigned long buff[SCTP_MIB_MAX]; |
13d782f6 | 62 | struct net *net = seq->private; |
1da177e4 LT |
63 | int i; |
64 | ||
7d64a94b JH |
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); | |
6d4a741c | 69 | for (i = 0; sctp_snmp_list[i].name; i++) |
1da177e4 | 70 | seq_printf(seq, "%-32s\t%ld\n", sctp_snmp_list[i].name, |
7d64a94b | 71 | buff[i]); |
1da177e4 LT |
72 | |
73 | return 0; | |
74 | } | |
75 | ||
1da177e4 LT |
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 | { | |
bca735bd | 79 | struct sctp_association *asoc; |
1da177e4 | 80 | struct sctp_sockaddr_entry *laddr; |
bca735bd VY |
81 | struct sctp_transport *peer; |
82 | union sctp_addr *addr, *primary = NULL; | |
1da177e4 LT |
83 | struct sctp_af *af; |
84 | ||
bca735bd | 85 | if (epb->type == SCTP_EP_TYPE_ASSOCIATION) { |
f9e42b85 DB |
86 | asoc = sctp_assoc(epb); |
87 | ||
88 | peer = asoc->peer.primary_path; | |
89 | if (unlikely(peer == NULL)) { | |
b527fe69 | 90 | WARN(1, "Association %p with NULL primary path!\n", asoc); |
f9e42b85 DB |
91 | return; |
92 | } | |
93 | ||
94 | primary = &peer->saddr; | |
bca735bd VY |
95 | } |
96 | ||
0b0fe913 TG |
97 | rcu_read_lock(); |
98 | list_for_each_entry_rcu(laddr, &epb->bind_addr.address_list, list) { | |
99 | if (!laddr->valid) | |
100 | continue; | |
101 | ||
5f242a13 | 102 | addr = &laddr->a; |
1da177e4 | 103 | af = sctp_get_af_specific(addr->sa.sa_family); |
bca735bd VY |
104 | if (primary && af->cmp_addr(addr, primary)) { |
105 | seq_printf(seq, "*"); | |
106 | } | |
5f242a13 | 107 | af->seq_dump_addr(seq, addr); |
1da177e4 | 108 | } |
0b0fe913 | 109 | rcu_read_unlock(); |
1da177e4 LT |
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 | { | |
1da177e4 | 115 | struct sctp_transport *transport; |
bca735bd | 116 | union sctp_addr *addr, *primary; |
1da177e4 LT |
117 | struct sctp_af *af; |
118 | ||
acd2bc96 | 119 | primary = &assoc->peer.primary_addr; |
45122ca2 | 120 | list_for_each_entry_rcu(transport, &assoc->peer.transport_addr_list, |
9dbc15f0 | 121 | transports) { |
5f242a13 | 122 | addr = &transport->ipaddr; |
45122ca2 | 123 | |
1da177e4 | 124 | af = sctp_get_af_specific(addr->sa.sa_family); |
acd2bc96 | 125 | if (af->cmp_addr(addr, primary)) { |
bca735bd VY |
126 | seq_printf(seq, "*"); |
127 | } | |
5f242a13 | 128 | af->seq_dump_addr(seq, addr); |
1da177e4 LT |
129 | } |
130 | } | |
131 | ||
26ac8e5f | 132 | static void *sctp_eps_seq_start(struct seq_file *seq, loff_t *pos) |
bca735bd | 133 | { |
49392e5e | 134 | if (*pos >= sctp_ep_hashsize) |
bca735bd VY |
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 | ||
bca735bd VY |
143 | return (void *)pos; |
144 | } | |
145 | ||
146 | static void sctp_eps_seq_stop(struct seq_file *seq, void *v) | |
147 | { | |
bca735bd VY |
148 | } |
149 | ||
150 | ||
26ac8e5f | 151 | static void *sctp_eps_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
bca735bd | 152 | { |
49392e5e | 153 | if (++*pos >= sctp_ep_hashsize) |
bca735bd VY |
154 | return NULL; |
155 | ||
bca735bd VY |
156 | return pos; |
157 | } | |
158 | ||
159 | ||
1da177e4 LT |
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; | |
1da177e4 LT |
164 | struct sctp_endpoint *ep; |
165 | struct sock *sk; | |
38b0e42a | 166 | int hash = *(loff_t *)v; |
bca735bd | 167 | |
49392e5e | 168 | if (hash >= sctp_ep_hashsize) |
bca735bd VY |
169 | return -ENOMEM; |
170 | ||
49392e5e | 171 | head = &sctp_ep_hashtable[hash]; |
c0a4c2d1 | 172 | read_lock_bh(&head->lock); |
3d3b2f57 XL |
173 | sctp_for_each_hentry(ep, &head->chain) { |
174 | sk = ep->base.sk; | |
6932f119 | 175 | if (!net_eq(sock_net(sk), seq_file_net(seq))) |
13d782f6 | 176 | continue; |
d14c5ab6 | 177 | seq_printf(seq, "%8pK %8pK %-3d %-3d %-4d %-5d %5u %5lu ", ep, sk, |
49392e5e | 178 | sctp_sk(sk)->type, sk->sk_state, hash, |
3d3b2f57 | 179 | ep->base.bind_addr.port, |
a7cb5a49 EB |
180 | from_kuid_munged(seq_user_ns(seq), sock_i_uid(sk)), |
181 | sock_i_ino(sk)); | |
bca735bd | 182 | |
3d3b2f57 | 183 | sctp_seq_dump_local_addrs(seq, &ep->base); |
bca735bd | 184 | seq_printf(seq, "\n"); |
1da177e4 | 185 | } |
c0a4c2d1 | 186 | read_unlock_bh(&head->lock); |
1da177e4 LT |
187 | |
188 | return 0; | |
189 | } | |
190 | ||
56b3d975 | 191 | static const struct seq_operations sctp_eps_ops = { |
bca735bd VY |
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 | ||
39f66a7d XL |
198 | struct sctp_ht_iter { |
199 | struct seq_net_private p; | |
200 | struct rhashtable_iter hti; | |
201 | }; | |
bca735bd | 202 | |
b5e2f4e6 | 203 | static void *sctp_transport_seq_start(struct seq_file *seq, loff_t *pos) |
39f66a7d | 204 | { |
626d16f5 | 205 | struct sctp_ht_iter *iter = seq->private; |
39f66a7d | 206 | |
97a6ec4a | 207 | sctp_transport_walk_start(&iter->hti); |
39f66a7d | 208 | |
626d16f5 | 209 | return sctp_transport_get_idx(seq_file_net(seq), &iter->hti, *pos); |
39f66a7d XL |
210 | } |
211 | ||
b5e2f4e6 | 212 | static void sctp_transport_seq_stop(struct seq_file *seq, void *v) |
39f66a7d | 213 | { |
626d16f5 XL |
214 | struct sctp_ht_iter *iter = seq->private; |
215 | ||
af8085f3 N |
216 | if (v && v != SEQ_START_TOKEN) { |
217 | struct sctp_transport *transport = v; | |
218 | ||
219 | sctp_transport_put(transport); | |
220 | } | |
221 | ||
626d16f5 | 222 | sctp_transport_walk_stop(&iter->hti); |
39f66a7d | 223 | } |
bca735bd | 224 | |
b5e2f4e6 | 225 | static void *sctp_transport_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
bca735bd | 226 | { |
626d16f5 XL |
227 | struct sctp_ht_iter *iter = seq->private; |
228 | ||
af8085f3 N |
229 | if (v && v != SEQ_START_TOKEN) { |
230 | struct sctp_transport *transport = v; | |
231 | ||
232 | sctp_transport_put(transport); | |
233 | } | |
234 | ||
39f66a7d | 235 | ++*pos; |
bca735bd | 236 | |
626d16f5 | 237 | return sctp_transport_get_next(seq_file_net(seq), &iter->hti); |
bca735bd VY |
238 | } |
239 | ||
1da177e4 LT |
240 | /* Display sctp associations (/proc/net/sctp/assocs). */ |
241 | static int sctp_assocs_seq_show(struct seq_file *seq, void *v) | |
242 | { | |
39f66a7d | 243 | struct sctp_transport *transport; |
1da177e4 | 244 | struct sctp_association *assoc; |
39f66a7d | 245 | struct sctp_ep_common *epb; |
1da177e4 | 246 | struct sock *sk; |
bca735bd | 247 | |
39f66a7d XL |
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; | |
1da177e4 | 255 | } |
39f66a7d XL |
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", | |
cee360ab XL |
280 | assoc->hbinterval, assoc->stream.incnt, |
281 | assoc->stream.outcnt, assoc->max_retrans, | |
39f66a7d XL |
282 | assoc->init_retries, assoc->shutdown_retries, |
283 | assoc->rtx_data_chunks, | |
14afee4b | 284 | refcount_read(&sk->sk_wmem_alloc), |
39f66a7d XL |
285 | sk->sk_wmem_queued, |
286 | sk->sk_sndbuf, | |
287 | sk->sk_rcvbuf); | |
288 | seq_printf(seq, "\n"); | |
1da177e4 LT |
289 | |
290 | return 0; | |
291 | } | |
292 | ||
56b3d975 | 293 | static const struct seq_operations sctp_assoc_ops = { |
b5e2f4e6 XL |
294 | .start = sctp_transport_seq_start, |
295 | .next = sctp_transport_seq_next, | |
296 | .stop = sctp_transport_seq_stop, | |
bca735bd VY |
297 | .show = sctp_assocs_seq_show, |
298 | }; | |
299 | ||
20c2c1fd NH |
300 | static int sctp_remaddr_seq_show(struct seq_file *seq, void *v) |
301 | { | |
20c2c1fd | 302 | struct sctp_association *assoc; |
3d73e8fa | 303 | struct sctp_transport *transport, *tsp; |
20c2c1fd | 304 | |
39f66a7d XL |
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 | } | |
20c2c1fd | 310 | |
3d73e8fa | 311 | transport = (struct sctp_transport *)v; |
3d73e8fa | 312 | assoc = transport->asoc; |
39f66a7d XL |
313 | |
314 | list_for_each_entry_rcu(tsp, &assoc->peer.transport_addr_list, | |
315 | transports) { | |
39f66a7d XL |
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); | |
45122ca2 | 361 | |
39f66a7d | 362 | seq_printf(seq, "\n"); |
20c2c1fd NH |
363 | } |
364 | ||
20c2c1fd | 365 | return 0; |
20c2c1fd NH |
366 | } |
367 | ||
368 | static const struct seq_operations sctp_remaddr_ops = { | |
b5e2f4e6 XL |
369 | .start = sctp_transport_seq_start, |
370 | .next = sctp_transport_seq_next, | |
371 | .stop = sctp_transport_seq_stop, | |
20c2c1fd NH |
372 | .show = sctp_remaddr_seq_show, |
373 | }; | |
374 | ||
d47d08c8 AV |
375 | /* Set up the proc fs entry for the SCTP protocol. */ |
376 | int __net_init sctp_proc_init(struct net *net) | |
20c2c1fd | 377 | { |
d47d08c8 AV |
378 | net->sctp.proc_net_sctp = proc_net_mkdir(net, "sctp", net->proc_net); |
379 | if (!net->sctp.proc_net_sctp) | |
20c2c1fd | 380 | return -ENOMEM; |
3617d949 CH |
381 | if (!proc_create_net_single("snmp", 0444, net->sctp.proc_net_sctp, |
382 | sctp_snmp_seq_show, NULL)) | |
d47d08c8 | 383 | goto cleanup; |
c3506372 CH |
384 | if (!proc_create_net("eps", 0444, net->sctp.proc_net_sctp, |
385 | &sctp_eps_ops, sizeof(struct seq_net_private))) | |
d47d08c8 | 386 | goto cleanup; |
c3506372 CH |
387 | if (!proc_create_net("assocs", 0444, net->sctp.proc_net_sctp, |
388 | &sctp_assoc_ops, sizeof(struct sctp_ht_iter))) | |
d47d08c8 | 389 | goto cleanup; |
c3506372 CH |
390 | if (!proc_create_net("remaddr", 0444, net->sctp.proc_net_sctp, |
391 | &sctp_remaddr_ops, sizeof(struct sctp_ht_iter))) | |
d47d08c8 | 392 | goto cleanup; |
20c2c1fd | 393 | return 0; |
d47d08c8 AV |
394 | |
395 | cleanup: | |
396 | remove_proc_subtree("sctp", net->proc_net); | |
397 | net->sctp.proc_net_sctp = NULL; | |
398 | return -ENOMEM; | |
20c2c1fd | 399 | } |