blob: 98ecd16da0c91e868609b1cfd6634c296db31fa4 [file] [log] [blame]
Xin Long8f840e42016-04-14 15:35:33 +08001#include <linux/module.h>
2#include <linux/inet_diag.h>
3#include <linux/sock_diag.h>
4#include <net/sctp/sctp.h>
5
6extern void inet_diag_msg_common_fill(struct inet_diag_msg *r,
7 struct sock *sk);
8extern int inet_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb,
9 struct inet_diag_msg *r, int ext,
10 struct user_namespace *user_ns);
11
12static void sctp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
13 void *info);
14
15/* define some functions to make asoc/ep fill look clean */
16static void inet_diag_msg_sctpasoc_fill(struct inet_diag_msg *r,
17 struct sock *sk,
18 struct sctp_association *asoc)
19{
20 union sctp_addr laddr, paddr;
21 struct dst_entry *dst;
22
23 laddr = list_entry(asoc->base.bind_addr.address_list.next,
24 struct sctp_sockaddr_entry, list)->a;
25 paddr = asoc->peer.primary_path->ipaddr;
26 dst = asoc->peer.primary_path->dst;
27
28 r->idiag_family = sk->sk_family;
29 r->id.idiag_sport = htons(asoc->base.bind_addr.port);
30 r->id.idiag_dport = htons(asoc->peer.port);
31 r->id.idiag_if = dst ? dst->dev->ifindex : 0;
32 sock_diag_save_cookie(sk, r->id.idiag_cookie);
33
34#if IS_ENABLED(CONFIG_IPV6)
35 if (sk->sk_family == AF_INET6) {
36 *(struct in6_addr *)r->id.idiag_src = laddr.v6.sin6_addr;
37 *(struct in6_addr *)r->id.idiag_dst = paddr.v6.sin6_addr;
38 } else
39#endif
40 {
41 memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
42 memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
43
44 r->id.idiag_src[0] = laddr.v4.sin_addr.s_addr;
45 r->id.idiag_dst[0] = paddr.v4.sin_addr.s_addr;
46 }
47
48 r->idiag_state = asoc->state;
49 r->idiag_timer = SCTP_EVENT_TIMEOUT_T3_RTX;
50 r->idiag_retrans = asoc->rtx_data_chunks;
51#define EXPIRES_IN_MS(tmo) DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
52 r->idiag_expires =
53 EXPIRES_IN_MS(asoc->timeouts[SCTP_EVENT_TIMEOUT_T3_RTX]);
54#undef EXPIRES_IN_MS
55}
56
57static int inet_diag_msg_sctpladdrs_fill(struct sk_buff *skb,
58 struct list_head *address_list)
59{
60 struct sctp_sockaddr_entry *laddr;
61 int addrlen = sizeof(struct sockaddr_storage);
62 int addrcnt = 0;
63 struct nlattr *attr;
64 void *info = NULL;
65
66 list_for_each_entry_rcu(laddr, address_list, list)
67 addrcnt++;
68
69 attr = nla_reserve(skb, INET_DIAG_LOCALS, addrlen * addrcnt);
70 if (!attr)
71 return -EMSGSIZE;
72
73 info = nla_data(attr);
74 list_for_each_entry_rcu(laddr, address_list, list) {
75 memcpy(info, &laddr->a, addrlen);
76 info += addrlen;
77 }
78
79 return 0;
80}
81
82static int inet_diag_msg_sctpaddrs_fill(struct sk_buff *skb,
83 struct sctp_association *asoc)
84{
85 int addrlen = sizeof(struct sockaddr_storage);
86 struct sctp_transport *from;
87 struct nlattr *attr;
88 void *info = NULL;
89
90 attr = nla_reserve(skb, INET_DIAG_PEERS,
91 addrlen * asoc->peer.transport_count);
92 if (!attr)
93 return -EMSGSIZE;
94
95 info = nla_data(attr);
96 list_for_each_entry(from, &asoc->peer.transport_addr_list,
97 transports) {
98 memcpy(info, &from->ipaddr, addrlen);
99 info += addrlen;
100 }
101
102 return 0;
103}
104
105/* sctp asoc/ep fill*/
106static int inet_sctp_diag_fill(struct sock *sk, struct sctp_association *asoc,
107 struct sk_buff *skb,
108 const struct inet_diag_req_v2 *req,
109 struct user_namespace *user_ns,
110 int portid, u32 seq, u16 nlmsg_flags,
111 const struct nlmsghdr *unlh)
112{
113 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
114 struct list_head *addr_list;
115 struct inet_diag_msg *r;
116 struct nlmsghdr *nlh;
117 int ext = req->idiag_ext;
118 struct sctp_infox infox;
119 void *info = NULL;
120
121 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
122 nlmsg_flags);
123 if (!nlh)
124 return -EMSGSIZE;
125
126 r = nlmsg_data(nlh);
127 BUG_ON(!sk_fullsock(sk));
128
129 if (asoc) {
130 inet_diag_msg_sctpasoc_fill(r, sk, asoc);
131 } else {
132 inet_diag_msg_common_fill(r, sk);
133 r->idiag_state = sk->sk_state;
134 r->idiag_timer = 0;
135 r->idiag_retrans = 0;
136 }
137
138 if (inet_diag_msg_attrs_fill(sk, skb, r, ext, user_ns))
139 goto errout;
140
141 if (ext & (1 << (INET_DIAG_SKMEMINFO - 1))) {
142 u32 mem[SK_MEMINFO_VARS];
143 int amt;
144
145 if (asoc && asoc->ep->sndbuf_policy)
146 amt = asoc->sndbuf_used;
147 else
148 amt = sk_wmem_alloc_get(sk);
149 mem[SK_MEMINFO_WMEM_ALLOC] = amt;
150 mem[SK_MEMINFO_RMEM_ALLOC] = sk_rmem_alloc_get(sk);
151 mem[SK_MEMINFO_RCVBUF] = sk->sk_rcvbuf;
152 mem[SK_MEMINFO_SNDBUF] = sk->sk_sndbuf;
153 mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc;
154 mem[SK_MEMINFO_WMEM_QUEUED] = sk->sk_wmem_queued;
155 mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc);
156 mem[SK_MEMINFO_BACKLOG] = sk->sk_backlog.len;
157 mem[SK_MEMINFO_DROPS] = atomic_read(&sk->sk_drops);
158
159 if (nla_put(skb, INET_DIAG_SKMEMINFO, sizeof(mem), &mem) < 0)
160 goto errout;
161 }
162
163 if (ext & (1 << (INET_DIAG_INFO - 1))) {
164 struct nlattr *attr;
165
166 attr = nla_reserve(skb, INET_DIAG_INFO,
167 sizeof(struct sctp_info));
168 if (!attr)
169 goto errout;
170
171 info = nla_data(attr);
172 }
173 infox.sctpinfo = (struct sctp_info *)info;
174 infox.asoc = asoc;
175 sctp_diag_get_info(sk, r, &infox);
176
177 addr_list = asoc ? &asoc->base.bind_addr.address_list
178 : &ep->base.bind_addr.address_list;
179 if (inet_diag_msg_sctpladdrs_fill(skb, addr_list))
180 goto errout;
181
182 if (asoc && (ext & (1 << (INET_DIAG_CONG - 1))))
183 if (nla_put_string(skb, INET_DIAG_CONG, "reno") < 0)
184 goto errout;
185
186 if (asoc && inet_diag_msg_sctpaddrs_fill(skb, asoc))
187 goto errout;
188
189 nlmsg_end(skb, nlh);
190 return 0;
191
192errout:
193 nlmsg_cancel(skb, nlh);
194 return -EMSGSIZE;
195}
196
197/* callback and param */
198struct sctp_comm_param {
199 struct sk_buff *skb;
200 struct netlink_callback *cb;
201 const struct inet_diag_req_v2 *r;
202 const struct nlmsghdr *nlh;
203};
204
205static size_t inet_assoc_attr_size(struct sctp_association *asoc)
206{
207 int addrlen = sizeof(struct sockaddr_storage);
208 int addrcnt = 0;
209 struct sctp_sockaddr_entry *laddr;
210
211 list_for_each_entry_rcu(laddr, &asoc->base.bind_addr.address_list,
212 list)
213 addrcnt++;
214
215 return nla_total_size(sizeof(struct sctp_info))
216 + nla_total_size(1) /* INET_DIAG_SHUTDOWN */
217 + nla_total_size(1) /* INET_DIAG_TOS */
218 + nla_total_size(1) /* INET_DIAG_TCLASS */
219 + nla_total_size(addrlen * asoc->peer.transport_count)
220 + nla_total_size(addrlen * addrcnt)
221 + nla_total_size(sizeof(struct inet_diag_meminfo))
222 + nla_total_size(sizeof(struct inet_diag_msg))
223 + 64;
224}
225
226static int sctp_tsp_dump_one(struct sctp_transport *tsp, void *p)
227{
228 struct sctp_association *assoc = tsp->asoc;
229 struct sock *sk = tsp->asoc->base.sk;
230 struct sctp_comm_param *commp = p;
231 struct sk_buff *in_skb = commp->skb;
232 const struct inet_diag_req_v2 *req = commp->r;
233 const struct nlmsghdr *nlh = commp->nlh;
234 struct net *net = sock_net(in_skb->sk);
235 struct sk_buff *rep;
236 int err;
237
238 err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
239 if (err)
240 goto out;
241
242 err = -ENOMEM;
243 rep = nlmsg_new(inet_assoc_attr_size(assoc), GFP_KERNEL);
244 if (!rep)
245 goto out;
246
247 lock_sock(sk);
248 if (sk != assoc->base.sk) {
249 release_sock(sk);
250 sk = assoc->base.sk;
251 lock_sock(sk);
252 }
253 err = inet_sctp_diag_fill(sk, assoc, rep, req,
254 sk_user_ns(NETLINK_CB(in_skb).sk),
255 NETLINK_CB(in_skb).portid,
256 nlh->nlmsg_seq, 0, nlh);
257 release_sock(sk);
258 if (err < 0) {
259 WARN_ON(err == -EMSGSIZE);
260 kfree_skb(rep);
261 goto out;
262 }
263
264 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
265 MSG_DONTWAIT);
266 if (err > 0)
267 err = 0;
268out:
269 return err;
270}
271
272static int sctp_tsp_dump(struct sctp_transport *tsp, void *p)
273{
274 struct sctp_endpoint *ep = tsp->asoc->ep;
275 struct sctp_comm_param *commp = p;
276 struct sock *sk = ep->base.sk;
277 struct sk_buff *skb = commp->skb;
278 struct netlink_callback *cb = commp->cb;
279 const struct inet_diag_req_v2 *r = commp->r;
280 struct sctp_association *assoc =
281 list_entry(ep->asocs.next, struct sctp_association, asocs);
282 int err = 0;
283
284 /* find the ep only once through the transports by this condition */
285 if (tsp->asoc != assoc)
286 goto out;
287
288 if (r->sdiag_family != AF_UNSPEC && sk->sk_family != r->sdiag_family)
289 goto out;
290
291 lock_sock(sk);
292 if (sk != assoc->base.sk)
293 goto release;
294 list_for_each_entry(assoc, &ep->asocs, asocs) {
295 if (cb->args[4] < cb->args[1])
296 goto next;
297
298 if (r->id.idiag_sport != htons(assoc->base.bind_addr.port) &&
299 r->id.idiag_sport)
300 goto next;
301 if (r->id.idiag_dport != htons(assoc->peer.port) &&
302 r->id.idiag_dport)
303 goto next;
304
305 if (!cb->args[3] &&
306 inet_sctp_diag_fill(sk, NULL, skb, r,
307 sk_user_ns(NETLINK_CB(cb->skb).sk),
308 NETLINK_CB(cb->skb).portid,
309 cb->nlh->nlmsg_seq,
310 NLM_F_MULTI, cb->nlh) < 0) {
311 cb->args[3] = 1;
312 err = 2;
313 goto release;
314 }
315 cb->args[3] = 1;
316
317 if (inet_sctp_diag_fill(sk, assoc, skb, r,
318 sk_user_ns(NETLINK_CB(cb->skb).sk),
319 NETLINK_CB(cb->skb).portid,
320 cb->nlh->nlmsg_seq, 0, cb->nlh) < 0) {
321 err = 2;
322 goto release;
323 }
324next:
325 cb->args[4]++;
326 }
327 cb->args[1] = 0;
328 cb->args[2]++;
329 cb->args[3] = 0;
330 cb->args[4] = 0;
331release:
332 release_sock(sk);
333 return err;
334out:
335 cb->args[2]++;
336 return err;
337}
338
339static int sctp_ep_dump(struct sctp_endpoint *ep, void *p)
340{
341 struct sctp_comm_param *commp = p;
342 struct sock *sk = ep->base.sk;
343 struct sk_buff *skb = commp->skb;
344 struct netlink_callback *cb = commp->cb;
345 const struct inet_diag_req_v2 *r = commp->r;
346 struct net *net = sock_net(skb->sk);
347 struct inet_sock *inet = inet_sk(sk);
348 int err = 0;
349
350 if (!net_eq(sock_net(sk), net))
351 goto out;
352
353 if (cb->args[4] < cb->args[1])
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/* define the functions for sctp_diag_handler*/
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 /* eps hashtable dumps
445 * args:
446 * 0 : if it will traversal listen sock
447 * 1 : to record the sock pos of this time's traversal
448 * 4 : to work as a temporary variable to traversal list
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 /* asocs by transport hashtable dump
462 * args:
463 * 1 : to record the assoc pos of this time's traversal
464 * 2 : to record the transport pos of this time's traversal
465 * 3 : to mark if we have dumped the ep info of the current asoc
466 * 4 : to work as a temporary variable to traversal list
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);