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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
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
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
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 = nlmsg_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid);
288
289out:
290 return err;
291}
292
293static int sctp_sock_dump(struct sctp_transport *tsp, void *p)
294{
295 struct sctp_endpoint *ep = tsp->asoc->ep;
296 struct sctp_comm_param *commp = p;
297 struct sock *sk = ep->base.sk;
298 struct sk_buff *skb = commp->skb;
299 struct netlink_callback *cb = commp->cb;
300 const struct inet_diag_req_v2 *r = commp->r;
301 struct sctp_association *assoc;
302 int err = 0;
303
304 lock_sock(sk);
305 list_for_each_entry(assoc, &ep->asocs, asocs) {
306 if (cb->args[4] < cb->args[1])
307 goto next;
308
309 if (r->id.idiag_sport != htons(assoc->base.bind_addr.port) &&
310 r->id.idiag_sport)
311 goto next;
312 if (r->id.idiag_dport != htons(assoc->peer.port) &&
313 r->id.idiag_dport)
314 goto next;
315
316 if (!cb->args[3] &&
317 inet_sctp_diag_fill(sk, NULL, skb, r,
318 sk_user_ns(NETLINK_CB(cb->skb).sk),
319 NETLINK_CB(cb->skb).portid,
320 cb->nlh->nlmsg_seq,
321 NLM_F_MULTI, cb->nlh,
322 commp->net_admin) < 0) {
323 err = 1;
324 goto release;
325 }
326 cb->args[3] = 1;
327
328 if (inet_sctp_diag_fill(sk, assoc, skb, r,
329 sk_user_ns(NETLINK_CB(cb->skb).sk),
330 NETLINK_CB(cb->skb).portid,
331 cb->nlh->nlmsg_seq, 0, cb->nlh,
332 commp->net_admin) < 0) {
333 err = 1;
334 goto release;
335 }
336next:
337 cb->args[4]++;
338 }
339 cb->args[1] = 0;
340 cb->args[3] = 0;
341 cb->args[4] = 0;
342release:
343 release_sock(sk);
344 return err;
345}
346
347static int sctp_sock_filter(struct sctp_transport *tsp, void *p)
348{
349 struct sctp_endpoint *ep = tsp->asoc->ep;
350 struct sctp_comm_param *commp = p;
351 struct sock *sk = ep->base.sk;
352 const struct inet_diag_req_v2 *r = commp->r;
353 struct sctp_association *assoc =
354 list_entry(ep->asocs.next, struct sctp_association, asocs);
355
356
357 if (tsp->asoc != assoc)
358 return 0;
359
360 if (r->sdiag_family != AF_UNSPEC && sk->sk_family != r->sdiag_family)
361 return 0;
362
363 return 1;
364}
365
366static int sctp_ep_dump(struct sctp_endpoint *ep, void *p)
367{
368 struct sctp_comm_param *commp = p;
369 struct sock *sk = ep->base.sk;
370 struct sk_buff *skb = commp->skb;
371 struct netlink_callback *cb = commp->cb;
372 const struct inet_diag_req_v2 *r = commp->r;
373 struct net *net = sock_net(skb->sk);
374 struct inet_sock *inet = inet_sk(sk);
375 int err = 0;
376
377 if (!net_eq(sock_net(sk), net))
378 goto out;
379
380 if (cb->args[4] < cb->args[1])
381 goto next;
382
383 if (!(r->idiag_states & TCPF_LISTEN) && !list_empty(&ep->asocs))
384 goto next;
385
386 if (r->sdiag_family != AF_UNSPEC &&
387 sk->sk_family != r->sdiag_family)
388 goto next;
389
390 if (r->id.idiag_sport != inet->inet_sport &&
391 r->id.idiag_sport)
392 goto next;
393
394 if (r->id.idiag_dport != inet->inet_dport &&
395 r->id.idiag_dport)
396 goto next;
397
398 if (inet_sctp_diag_fill(sk, NULL, skb, r,
399 sk_user_ns(NETLINK_CB(cb->skb).sk),
400 NETLINK_CB(cb->skb).portid,
401 cb->nlh->nlmsg_seq, NLM_F_MULTI,
402 cb->nlh, commp->net_admin) < 0) {
403 err = 2;
404 goto out;
405 }
406next:
407 cb->args[4]++;
408out:
409 return err;
410}
411
412
413static void sctp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
414 void *info)
415{
416 struct sctp_infox *infox = (struct sctp_infox *)info;
417
418 if (infox->asoc) {
419 r->idiag_rqueue = atomic_read(&infox->asoc->rmem_alloc);
420 r->idiag_wqueue = infox->asoc->sndbuf_used;
421 } else {
422 r->idiag_rqueue = READ_ONCE(sk->sk_ack_backlog);
423 r->idiag_wqueue = READ_ONCE(sk->sk_max_ack_backlog);
424 }
425 if (infox->sctpinfo)
426 sctp_get_sctp_info(sk, infox->asoc, infox->sctpinfo);
427}
428
429static int sctp_diag_dump_one(struct netlink_callback *cb,
430 const struct inet_diag_req_v2 *req)
431{
432 struct sk_buff *in_skb = cb->skb;
433 struct net *net = sock_net(in_skb->sk);
434 const struct nlmsghdr *nlh = cb->nlh;
435 union sctp_addr laddr, paddr;
436 struct sctp_comm_param commp = {
437 .skb = in_skb,
438 .r = req,
439 .nlh = nlh,
440 .net_admin = netlink_net_capable(in_skb, CAP_NET_ADMIN),
441 };
442
443 if (req->sdiag_family == AF_INET) {
444 laddr.v4.sin_port = req->id.idiag_sport;
445 laddr.v4.sin_addr.s_addr = req->id.idiag_src[0];
446 laddr.v4.sin_family = AF_INET;
447
448 paddr.v4.sin_port = req->id.idiag_dport;
449 paddr.v4.sin_addr.s_addr = req->id.idiag_dst[0];
450 paddr.v4.sin_family = AF_INET;
451 } else {
452 laddr.v6.sin6_port = req->id.idiag_sport;
453 memcpy(&laddr.v6.sin6_addr, req->id.idiag_src,
454 sizeof(laddr.v6.sin6_addr));
455 laddr.v6.sin6_family = AF_INET6;
456
457 paddr.v6.sin6_port = req->id.idiag_dport;
458 memcpy(&paddr.v6.sin6_addr, req->id.idiag_dst,
459 sizeof(paddr.v6.sin6_addr));
460 paddr.v6.sin6_family = AF_INET6;
461 }
462
463 return sctp_transport_lookup_process(sctp_tsp_dump_one,
464 net, &laddr, &paddr, &commp);
465}
466
467static void sctp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
468 const struct inet_diag_req_v2 *r)
469{
470 u32 idiag_states = r->idiag_states;
471 struct net *net = sock_net(skb->sk);
472 struct sctp_comm_param commp = {
473 .skb = skb,
474 .cb = cb,
475 .r = r,
476 .net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN),
477 };
478 int pos = cb->args[2];
479
480
481
482
483
484
485
486 if (cb->args[0] == 0) {
487 if (!(idiag_states & TCPF_LISTEN))
488 goto skip;
489 if (sctp_for_each_endpoint(sctp_ep_dump, &commp))
490 goto done;
491skip:
492 cb->args[0] = 1;
493 cb->args[1] = 0;
494 cb->args[4] = 0;
495 }
496
497
498
499
500
501
502
503
504
505 if (!(idiag_states & ~(TCPF_LISTEN | TCPF_CLOSE)))
506 goto done;
507
508 sctp_for_each_transport(sctp_sock_filter, sctp_sock_dump,
509 net, &pos, &commp);
510 cb->args[2] = pos;
511
512done:
513 cb->args[1] = cb->args[4];
514 cb->args[4] = 0;
515}
516
517static const struct inet_diag_handler sctp_diag_handler = {
518 .dump = sctp_diag_dump,
519 .dump_one = sctp_diag_dump_one,
520 .idiag_get_info = sctp_diag_get_info,
521 .idiag_type = IPPROTO_SCTP,
522 .idiag_info_size = sizeof(struct sctp_info),
523};
524
525static int __init sctp_diag_init(void)
526{
527 return inet_diag_register(&sctp_diag_handler);
528}
529
530static void __exit sctp_diag_exit(void)
531{
532 inet_diag_unregister(&sctp_diag_handler);
533}
534
535module_init(sctp_diag_init);
536module_exit(sctp_diag_exit);
537MODULE_LICENSE("GPL");
538MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-132);
539
