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