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(m: seq, fmt: "%-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(base: 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(m: seq, fmt: "*" ); |
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(m: seq, fmt: "*" ); |
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(m: seq, fmt: " 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(net1: sock_net(sk), net2: seq_file_net(seq))) |
176 | continue; |
177 | seq_printf(m: seq, fmt: "%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(to: seq_user_ns(seq), uid: sock_i_uid(sk)), |
181 | sock_i_ino(sk)); |
182 | |
183 | sctp_seq_dump_local_addrs(seq, epb: &ep->base); |
184 | seq_printf(m: seq, fmt: "\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: &iter->hti); |
208 | |
209 | return sctp_transport_get_idx(net: seq_file_net(seq), iter: &iter->hti, pos: *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: &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(net: seq_file_net(seq), iter: &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(m: seq, fmt: " 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(m: seq, |
263 | fmt: "%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(v: &assoc->rmem_alloc), |
270 | from_kuid_munged(to: seq_user_ns(seq), uid: sock_i_uid(sk)), |
271 | sock_i_ino(sk), |
272 | epb->bind_addr.port, |
273 | assoc->peer.port); |
274 | seq_printf(m: seq, fmt: " " ); |
275 | sctp_seq_dump_local_addrs(seq, epb); |
276 | seq_printf(m: seq, fmt: "<-> " ); |
277 | sctp_seq_dump_remote_addrs(seq, assoc); |
278 | seq_printf(m: seq, fmt: "\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(r: &sk->sk_wmem_alloc), |
285 | READ_ONCE(sk->sk_wmem_queued), |
286 | sk->sk_sndbuf, |
287 | sk->sk_rcvbuf); |
288 | seq_printf(m: seq, fmt: "\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(m: seq, fmt: "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(m: seq, fmt: " " ); |
321 | /* |
322 | * The association ID (ASSOC_ID) |
323 | */ |
324 | seq_printf(m: seq, fmt: "%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(m: seq, fmt: "%d " , timer_pending(timer: &tsp->hb_timer)); |
331 | |
332 | /* |
333 | * Retransmit time out (RTO) |
334 | */ |
335 | seq_printf(m: seq, fmt: "%lu " , tsp->rto); |
336 | |
337 | /* |
338 | * Maximum path retransmit count (PATH_MAX_RTX) |
339 | */ |
340 | seq_printf(m: seq, fmt: "%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(m: seq, s: "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(m: seq, s: "0 " ); |
355 | |
356 | /* |
357 | * The current state of this destination. I.e. |
358 | * SCTP_ACTIVE, SCTP_INACTIVE, ... |
359 | */ |
360 | seq_printf(m: seq, fmt: "%d" , tsp->state); |
361 | |
362 | seq_printf(m: seq, fmt: "\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, name: "sctp" , parent: net->proc_net); |
379 | if (!net->sctp.proc_net_sctp) |
380 | return -ENOMEM; |
381 | if (!proc_create_net_single(name: "snmp" , mode: 0444, parent: net->sctp.proc_net_sctp, |
382 | show: 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 | |