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