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