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1// SPDX-License-Identifier: GPL-2.0-or-later
2/* SCTP kernel implementation
3 * (C) Copyright Red Hat Inc. 2017
4 *
5 * This file is part of the SCTP kernel implementation
6 *
7 * These functions implement sctp diag support.
8 *
9 * Please send any bug reports or fixes you make to the
10 * email addresched(es):
11 * lksctp developers <linux-sctp@vger.kernel.org>
12 *
13 * Written or modified by:
14 * Xin Long <lucien.xin@gmail.com>
15 */
16
17#include <linux/module.h>
18#include <linux/inet_diag.h>
19#include <linux/sock_diag.h>
20#include <net/sctp/sctp.h>
21
22static void sctp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
23 void *info);
24
25/* define some functions to make asoc/ep fill look clean */
26static void inet_diag_msg_sctpasoc_fill(struct inet_diag_msg *r,
27 struct sock *sk,
28 struct sctp_association *asoc)
29{
30 union sctp_addr laddr, paddr;
31 struct dst_entry *dst;
32 struct timer_list *t3_rtx = &asoc->peer.primary_path->T3_rtx_timer;
33
34 laddr = list_entry(asoc->base.bind_addr.address_list.next,
35 struct sctp_sockaddr_entry, list)->a;
36 paddr = asoc->peer.primary_path->ipaddr;
37 dst = asoc->peer.primary_path->dst;
38
39 r->idiag_family = sk->sk_family;
40 r->id.idiag_sport = htons(asoc->base.bind_addr.port);
41 r->id.idiag_dport = htons(asoc->peer.port);
42 r->id.idiag_if = dst ? dst->dev->ifindex : 0;
43 sock_diag_save_cookie(sk, r->id.idiag_cookie);
44
45#if IS_ENABLED(CONFIG_IPV6)
46 if (sk->sk_family == AF_INET6) {
47 *(struct in6_addr *)r->id.idiag_src = laddr.v6.sin6_addr;
48 *(struct in6_addr *)r->id.idiag_dst = paddr.v6.sin6_addr;
49 } else
50#endif
51 {
52 memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
53 memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
54
55 r->id.idiag_src[0] = laddr.v4.sin_addr.s_addr;
56 r->id.idiag_dst[0] = paddr.v4.sin_addr.s_addr;
57 }
58
59 r->idiag_state = asoc->state;
60 if (timer_pending(t3_rtx)) {
61 r->idiag_timer = SCTP_EVENT_TIMEOUT_T3_RTX;
62 r->idiag_retrans = asoc->rtx_data_chunks;
63 r->idiag_expires = jiffies_to_msecs(t3_rtx->expires - jiffies);
64 } else {
65 r->idiag_timer = 0;
66 r->idiag_retrans = 0;
67 r->idiag_expires = 0;
68 }
69}
70
71static int inet_diag_msg_sctpladdrs_fill(struct sk_buff *skb,
72 struct list_head *address_list)
73{
74 struct sctp_sockaddr_entry *laddr;
75 int addrlen = sizeof(struct sockaddr_storage);
76 int addrcnt = 0;
77 struct nlattr *attr;
78 void *info = NULL;
79
80 list_for_each_entry_rcu(laddr, address_list, list)
81 addrcnt++;
82
83 attr = nla_reserve(skb, INET_DIAG_LOCALS, addrlen * addrcnt);
84 if (!attr)
85 return -EMSGSIZE;
86
87 info = nla_data(attr);
88 list_for_each_entry_rcu(laddr, address_list, list) {
89 memcpy(info, &laddr->a, sizeof(laddr->a));
90 memset(info + sizeof(laddr->a), 0, addrlen - sizeof(laddr->a));
91 info += addrlen;
92 }
93
94 return 0;
95}
96
97static int inet_diag_msg_sctpaddrs_fill(struct sk_buff *skb,
98 struct sctp_association *asoc)
99{
100 int addrlen = sizeof(struct sockaddr_storage);
101 struct sctp_transport *from;
102 struct nlattr *attr;
103 void *info = NULL;
104
105 attr = nla_reserve(skb, INET_DIAG_PEERS,
106 addrlen * asoc->peer.transport_count);
107 if (!attr)
108 return -EMSGSIZE;
109
110 info = nla_data(attr);
111 list_for_each_entry(from, &asoc->peer.transport_addr_list,
112 transports) {
113 memcpy(info, &from->ipaddr, sizeof(from->ipaddr));
114 memset(info + sizeof(from->ipaddr), 0,
115 addrlen - sizeof(from->ipaddr));
116 info += addrlen;
117 }
118
119 return 0;
120}
121
122/* sctp asoc/ep fill*/
123static int inet_sctp_diag_fill(struct sock *sk, struct sctp_association *asoc,
124 struct sk_buff *skb,
125 const struct inet_diag_req_v2 *req,
126 struct user_namespace *user_ns,
127 int portid, u32 seq, u16 nlmsg_flags,
128 const struct nlmsghdr *unlh,
129 bool net_admin)
130{
131 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
132 struct list_head *addr_list;
133 struct inet_diag_msg *r;
134 struct nlmsghdr *nlh;
135 int ext = req->idiag_ext;
136 struct sctp_infox infox;
137 void *info = NULL;
138
139 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
140 nlmsg_flags);
141 if (!nlh)
142 return -EMSGSIZE;
143
144 r = nlmsg_data(nlh);
145 BUG_ON(!sk_fullsock(sk));
146
147 if (asoc) {
148 inet_diag_msg_sctpasoc_fill(r, sk, asoc);
149 } else {
150 inet_diag_msg_common_fill(r, sk);
151 r->idiag_state = sk->sk_state;
152 r->idiag_timer = 0;
153 r->idiag_retrans = 0;
154 }
155
156 if (inet_diag_msg_attrs_fill(sk, skb, r, ext, user_ns, net_admin))
157 goto errout;
158
159 if (ext & (1 << (INET_DIAG_SKMEMINFO - 1))) {
160 u32 mem[SK_MEMINFO_VARS];
161 int amt;
162
163 if (asoc && asoc->ep->sndbuf_policy)
164 amt = asoc->sndbuf_used;
165 else
166 amt = sk_wmem_alloc_get(sk);
167 mem[SK_MEMINFO_WMEM_ALLOC] = amt;
168 if (asoc && asoc->ep->rcvbuf_policy)
169 amt = atomic_read(&asoc->rmem_alloc);
170 else
171 amt = sk_rmem_alloc_get(sk);
172 mem[SK_MEMINFO_RMEM_ALLOC] = amt;
173 mem[SK_MEMINFO_RCVBUF] = sk->sk_rcvbuf;
174 mem[SK_MEMINFO_SNDBUF] = sk->sk_sndbuf;
175 mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc;
176 mem[SK_MEMINFO_WMEM_QUEUED] = sk->sk_wmem_queued;
177 mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc);
178 mem[SK_MEMINFO_BACKLOG] = READ_ONCE(sk->sk_backlog.len);
179 mem[SK_MEMINFO_DROPS] = atomic_read(&sk->sk_drops);
180
181 if (nla_put(skb, INET_DIAG_SKMEMINFO, sizeof(mem), &mem) < 0)
182 goto errout;
183 }
184
185 if (ext & (1 << (INET_DIAG_INFO - 1))) {
186 struct nlattr *attr;
187
188 attr = nla_reserve_64bit(skb, INET_DIAG_INFO,
189 sizeof(struct sctp_info),
190 INET_DIAG_PAD);
191 if (!attr)
192 goto errout;
193
194 info = nla_data(attr);
195 }
196 infox.sctpinfo = (struct sctp_info *)info;
197 infox.asoc = asoc;
198 sctp_diag_get_info(sk, r, &infox);
199
200 addr_list = asoc ? &asoc->base.bind_addr.address_list
201 : &ep->base.bind_addr.address_list;
202 if (inet_diag_msg_sctpladdrs_fill(skb, addr_list))
203 goto errout;
204
205 if (asoc && (ext & (1 << (INET_DIAG_CONG - 1))))
206 if (nla_put_string(skb, INET_DIAG_CONG, "reno") < 0)
207 goto errout;
208
209 if (asoc && inet_diag_msg_sctpaddrs_fill(skb, asoc))
210 goto errout;
211
212 nlmsg_end(skb, nlh);
213 return 0;
214
215errout:
216 nlmsg_cancel(skb, nlh);
217 return -EMSGSIZE;
218}
219
220/* callback and param */
221struct sctp_comm_param {
222 struct sk_buff *skb;
223 struct netlink_callback *cb;
224 const struct inet_diag_req_v2 *r;
225 const struct nlmsghdr *nlh;
226 bool net_admin;
227};
228
229static size_t inet_assoc_attr_size(struct sctp_association *asoc)
230{
231 int addrlen = sizeof(struct sockaddr_storage);
232 int addrcnt = 0;
233 struct sctp_sockaddr_entry *laddr;
234
235 list_for_each_entry_rcu(laddr, &asoc->base.bind_addr.address_list,
236 list)
237 addrcnt++;
238
239 return nla_total_size(sizeof(struct sctp_info))
240 + nla_total_size(addrlen * asoc->peer.transport_count)
241 + nla_total_size(addrlen * addrcnt)
242 + nla_total_size(sizeof(struct inet_diag_msg))
243 + inet_diag_msg_attrs_size()
244 + nla_total_size(sizeof(struct inet_diag_meminfo))
245 + 64;
246}
247
248static int sctp_tsp_dump_one(struct sctp_transport *tsp, void *p)
249{
250 struct sctp_association *assoc = tsp->asoc;
251 struct sock *sk = tsp->asoc->base.sk;
252 struct sctp_comm_param *commp = p;
253 struct sk_buff *in_skb = commp->skb;
254 const struct inet_diag_req_v2 *req = commp->r;
255 const struct nlmsghdr *nlh = commp->nlh;
256 struct net *net = sock_net(in_skb->sk);
257 struct sk_buff *rep;
258 int err;
259
260 err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
261 if (err)
262 goto out;
263
264 err = -ENOMEM;
265 rep = nlmsg_new(inet_assoc_attr_size(assoc), GFP_KERNEL);
266 if (!rep)
267 goto out;
268
269 lock_sock(sk);
270 if (sk != assoc->base.sk) {
271 release_sock(sk);
272 sk = assoc->base.sk;
273 lock_sock(sk);
274 }
275 err = inet_sctp_diag_fill(sk, assoc, rep, req,
276 sk_user_ns(NETLINK_CB(in_skb).sk),
277 NETLINK_CB(in_skb).portid,
278 nlh->nlmsg_seq, 0, nlh,
279 commp->net_admin);
280 release_sock(sk);
281 if (err < 0) {
282 WARN_ON(err == -EMSGSIZE);
283 kfree_skb(rep);
284 goto out;
285 }
286
287 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
288 MSG_DONTWAIT);
289 if (err > 0)
290 err = 0;
291out:
292 return err;
293}
294
295static int sctp_sock_dump(struct sctp_transport *tsp, void *p)
296{
297 struct sctp_endpoint *ep = tsp->asoc->ep;
298 struct sctp_comm_param *commp = p;
299 struct sock *sk = ep->base.sk;
300 struct sk_buff *skb = commp->skb;
301 struct netlink_callback *cb = commp->cb;
302 const struct inet_diag_req_v2 *r = commp->r;
303 struct sctp_association *assoc;
304 int err = 0;
305
306 lock_sock(sk);
307 list_for_each_entry(assoc, &ep->asocs, asocs) {
308 if (cb->args[4] < cb->args[1])
309 goto next;
310
311 if (r->id.idiag_sport != htons(assoc->base.bind_addr.port) &&
312 r->id.idiag_sport)
313 goto next;
314 if (r->id.idiag_dport != htons(assoc->peer.port) &&
315 r->id.idiag_dport)
316 goto next;
317
318 if (!cb->args[3] &&
319 inet_sctp_diag_fill(sk, NULL, skb, r,
320 sk_user_ns(NETLINK_CB(cb->skb).sk),
321 NETLINK_CB(cb->skb).portid,
322 cb->nlh->nlmsg_seq,
323 NLM_F_MULTI, cb->nlh,
324 commp->net_admin) < 0) {
325 err = 1;
326 goto release;
327 }
328 cb->args[3] = 1;
329
330 if (inet_sctp_diag_fill(sk, assoc, skb, r,
331 sk_user_ns(NETLINK_CB(cb->skb).sk),
332 NETLINK_CB(cb->skb).portid,
333 cb->nlh->nlmsg_seq, 0, cb->nlh,
334 commp->net_admin) < 0) {
335 err = 1;
336 goto release;
337 }
338next:
339 cb->args[4]++;
340 }
341 cb->args[1] = 0;
342 cb->args[3] = 0;
343 cb->args[4] = 0;
344release:
345 release_sock(sk);
346 return err;
347}
348
349static int sctp_sock_filter(struct sctp_transport *tsp, void *p)
350{
351 struct sctp_endpoint *ep = tsp->asoc->ep;
352 struct sctp_comm_param *commp = p;
353 struct sock *sk = ep->base.sk;
354 const struct inet_diag_req_v2 *r = commp->r;
355 struct sctp_association *assoc =
356 list_entry(ep->asocs.next, struct sctp_association, asocs);
357
358 /* find the ep only once through the transports by this condition */
359 if (tsp->asoc != assoc)
360 return 0;
361
362 if (r->sdiag_family != AF_UNSPEC && sk->sk_family != r->sdiag_family)
363 return 0;
364
365 return 1;
366}
367
368static int sctp_ep_dump(struct sctp_endpoint *ep, void *p)
369{
370 struct sctp_comm_param *commp = p;
371 struct sock *sk = ep->base.sk;
372 struct sk_buff *skb = commp->skb;
373 struct netlink_callback *cb = commp->cb;
374 const struct inet_diag_req_v2 *r = commp->r;
375 struct net *net = sock_net(skb->sk);
376 struct inet_sock *inet = inet_sk(sk);
377 int err = 0;
378
379 if (!net_eq(sock_net(sk), net))
380 goto out;
381
382 if (cb->args[4] < cb->args[1])
383 goto next;
384
385 if (!(r->idiag_states & TCPF_LISTEN) && !list_empty(&ep->asocs))
386 goto next;
387
388 if (r->sdiag_family != AF_UNSPEC &&
389 sk->sk_family != r->sdiag_family)
390 goto next;
391
392 if (r->id.idiag_sport != inet->inet_sport &&
393 r->id.idiag_sport)
394 goto next;
395
396 if (r->id.idiag_dport != inet->inet_dport &&
397 r->id.idiag_dport)
398 goto next;
399
400 if (inet_sctp_diag_fill(sk, NULL, skb, r,
401 sk_user_ns(NETLINK_CB(cb->skb).sk),
402 NETLINK_CB(cb->skb).portid,
403 cb->nlh->nlmsg_seq, NLM_F_MULTI,
404 cb->nlh, commp->net_admin) < 0) {
405 err = 2;
406 goto out;
407 }
408next:
409 cb->args[4]++;
410out:
411 return err;
412}
413
414/* define the functions for sctp_diag_handler*/
415static void sctp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
416 void *info)
417{
418 struct sctp_infox *infox = (struct sctp_infox *)info;
419
420 if (infox->asoc) {
421 r->idiag_rqueue = atomic_read(&infox->asoc->rmem_alloc);
422 r->idiag_wqueue = infox->asoc->sndbuf_used;
423 } else {
424 r->idiag_rqueue = READ_ONCE(sk->sk_ack_backlog);
425 r->idiag_wqueue = READ_ONCE(sk->sk_max_ack_backlog);
426 }
427 if (infox->sctpinfo)
428 sctp_get_sctp_info(sk, infox->asoc, infox->sctpinfo);
429}
430
431static int sctp_diag_dump_one(struct netlink_callback *cb,
432 const struct inet_diag_req_v2 *req)
433{
434 struct sk_buff *in_skb = cb->skb;
435 struct net *net = sock_net(in_skb->sk);
436 const struct nlmsghdr *nlh = cb->nlh;
437 union sctp_addr laddr, paddr;
438 struct sctp_comm_param commp = {
439 .skb = in_skb,
440 .r = req,
441 .nlh = nlh,
442 .net_admin = netlink_net_capable(in_skb, CAP_NET_ADMIN),
443 };
444
445 if (req->sdiag_family == AF_INET) {
446 laddr.v4.sin_port = req->id.idiag_sport;
447 laddr.v4.sin_addr.s_addr = req->id.idiag_src[0];
448 laddr.v4.sin_family = AF_INET;
449
450 paddr.v4.sin_port = req->id.idiag_dport;
451 paddr.v4.sin_addr.s_addr = req->id.idiag_dst[0];
452 paddr.v4.sin_family = AF_INET;
453 } else {
454 laddr.v6.sin6_port = req->id.idiag_sport;
455 memcpy(&laddr.v6.sin6_addr, req->id.idiag_src,
456 sizeof(laddr.v6.sin6_addr));
457 laddr.v6.sin6_family = AF_INET6;
458
459 paddr.v6.sin6_port = req->id.idiag_dport;
460 memcpy(&paddr.v6.sin6_addr, req->id.idiag_dst,
461 sizeof(paddr.v6.sin6_addr));
462 paddr.v6.sin6_family = AF_INET6;
463 }
464
465 return sctp_transport_lookup_process(sctp_tsp_dump_one,
466 net, &laddr, &paddr, &commp);
467}
468
469static void sctp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
470 const struct inet_diag_req_v2 *r)
471{
472 u32 idiag_states = r->idiag_states;
473 struct net *net = sock_net(skb->sk);
474 struct sctp_comm_param commp = {
475 .skb = skb,
476 .cb = cb,
477 .r = r,
478 .net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN),
479 };
480 int pos = cb->args[2];
481
482 /* eps hashtable dumps
483 * args:
484 * 0 : if it will traversal listen sock
485 * 1 : to record the sock pos of this time's traversal
486 * 4 : to work as a temporary variable to traversal list
487 */
488 if (cb->args[0] == 0) {
489 if (!(idiag_states & TCPF_LISTEN))
490 goto skip;
491 if (sctp_for_each_endpoint(sctp_ep_dump, &commp))
492 goto done;
493skip:
494 cb->args[0] = 1;
495 cb->args[1] = 0;
496 cb->args[4] = 0;
497 }
498
499 /* asocs by transport hashtable dump
500 * args:
501 * 1 : to record the assoc pos of this time's traversal
502 * 2 : to record the transport pos of this time's traversal
503 * 3 : to mark if we have dumped the ep info of the current asoc
504 * 4 : to work as a temporary variable to traversal list
505 * 5 : to save the sk we get from travelsing the tsp list.
506 */
507 if (!(idiag_states & ~(TCPF_LISTEN | TCPF_CLOSE)))
508 goto done;
509
510 sctp_for_each_transport(sctp_sock_filter, sctp_sock_dump,
511 net, &pos, &commp);
512 cb->args[2] = pos;
513
514done:
515 cb->args[1] = cb->args[4];
516 cb->args[4] = 0;
517}
518
519static const struct inet_diag_handler sctp_diag_handler = {
520 .dump = sctp_diag_dump,
521 .dump_one = sctp_diag_dump_one,
522 .idiag_get_info = sctp_diag_get_info,
523 .idiag_type = IPPROTO_SCTP,
524 .idiag_info_size = sizeof(struct sctp_info),
525};
526
527static int __init sctp_diag_init(void)
528{
529 return inet_diag_register(&sctp_diag_handler);
530}
531
532static void __exit sctp_diag_exit(void)
533{
534 inet_diag_unregister(&sctp_diag_handler);
535}
536
537module_init(sctp_diag_init);
538module_exit(sctp_diag_exit);
539MODULE_LICENSE("GPL");
540MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-132);