xref: /openbmc/linux/net/ipv4/inet_diag.c (revision 9b93eb47) 
1 /*
2  * inet_diag.c	Module for monitoring INET transport protocols sockets.
3  *
4  * Authors:	Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
5  *
6  *	This program is free software; you can redistribute it and/or
7  *      modify it under the terms of the GNU General Public License
8  *      as published by the Free Software Foundation; either version
9  *      2 of the License, or (at your option) any later version.
10  */
11 
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/types.h>
15 #include <linux/fcntl.h>
16 #include <linux/random.h>
17 #include <linux/slab.h>
18 #include <linux/cache.h>
19 #include <linux/init.h>
20 #include <linux/time.h>
21 
22 #include <net/icmp.h>
23 #include <net/tcp.h>
24 #include <net/ipv6.h>
25 #include <net/inet_common.h>
26 #include <net/inet_connection_sock.h>
27 #include <net/inet_hashtables.h>
28 #include <net/inet_timewait_sock.h>
29 #include <net/inet6_hashtables.h>
30 #include <net/netlink.h>
31 
32 #include <linux/inet.h>
33 #include <linux/stddef.h>
34 
35 #include <linux/inet_diag.h>
36 #include <linux/sock_diag.h>
37 
38 static const struct inet_diag_handler **inet_diag_table;
39 
40 struct inet_diag_entry {
41 	const __be32 *saddr;
42 	const __be32 *daddr;
43 	u16 sport;
44 	u16 dport;
45 	u16 family;
46 	u16 userlocks;
47 	u32 ifindex;
48 	u32 mark;
49 };
50 
51 static DEFINE_MUTEX(inet_diag_table_mutex);
52 
53 static const struct inet_diag_handler *inet_diag_lock_handler(int proto)
54 {
55 	if (!inet_diag_table[proto])
56 		sock_load_diag_module(AF_INET, proto);
57 
58 	mutex_lock(&inet_diag_table_mutex);
59 	if (!inet_diag_table[proto])
60 		return ERR_PTR(-ENOENT);
61 
62 	return inet_diag_table[proto];
63 }
64 
65 static void inet_diag_unlock_handler(const struct inet_diag_handler *handler)
66 {
67 	mutex_unlock(&inet_diag_table_mutex);
68 }
69 
70 void inet_diag_msg_common_fill(struct inet_diag_msg *r, struct sock *sk)
71 {
72 	r->idiag_family = sk->sk_family;
73 
74 	r->id.idiag_sport = htons(sk->sk_num);
75 	r->id.idiag_dport = sk->sk_dport;
76 	r->id.idiag_if = sk->sk_bound_dev_if;
77 	sock_diag_save_cookie(sk, r->id.idiag_cookie);
78 
79 #if IS_ENABLED(CONFIG_IPV6)
80 	if (sk->sk_family == AF_INET6) {
81 		*(struct in6_addr *)r->id.idiag_src = sk->sk_v6_rcv_saddr;
82 		*(struct in6_addr *)r->id.idiag_dst = sk->sk_v6_daddr;
83 	} else
84 #endif
85 	{
86 	memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
87 	memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
88 
89 	r->id.idiag_src[0] = sk->sk_rcv_saddr;
90 	r->id.idiag_dst[0] = sk->sk_daddr;
91 	}
92 }
93 EXPORT_SYMBOL_GPL(inet_diag_msg_common_fill);
94 
95 static size_t inet_sk_attr_size(struct sock *sk,
96 				const struct inet_diag_req_v2 *req,
97 				bool net_admin)
98 {
99 	const struct inet_diag_handler *handler;
100 	size_t aux = 0;
101 
102 	handler = inet_diag_table[req->sdiag_protocol];
103 	if (handler && handler->idiag_get_aux_size)
104 		aux = handler->idiag_get_aux_size(sk, net_admin);
105 
106 	return	  nla_total_size(sizeof(struct tcp_info))
107 		+ nla_total_size(1) /* INET_DIAG_SHUTDOWN */
108 		+ nla_total_size(1) /* INET_DIAG_TOS */
109 		+ nla_total_size(1) /* INET_DIAG_TCLASS */
110 		+ nla_total_size(4) /* INET_DIAG_MARK */
111 		+ nla_total_size(4) /* INET_DIAG_CLASS_ID */
112 		+ nla_total_size(sizeof(struct inet_diag_meminfo))
113 		+ nla_total_size(sizeof(struct inet_diag_msg))
114 		+ nla_total_size(SK_MEMINFO_VARS * sizeof(u32))
115 		+ nla_total_size(TCP_CA_NAME_MAX)
116 		+ nla_total_size(sizeof(struct tcpvegas_info))
117 		+ aux
118 		+ 64;
119 }
120 
121 int inet_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb,
122 			     struct inet_diag_msg *r, int ext,
123 			     struct user_namespace *user_ns,
124 			     bool net_admin)
125 {
126 	const struct inet_sock *inet = inet_sk(sk);
127 
128 	if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown))
129 		goto errout;
130 
131 	/* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
132 	 * hence this needs to be included regardless of socket family.
133 	 */
134 	if (ext & (1 << (INET_DIAG_TOS - 1)))
135 		if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0)
136 			goto errout;
137 
138 #if IS_ENABLED(CONFIG_IPV6)
139 	if (r->idiag_family == AF_INET6) {
140 		if (ext & (1 << (INET_DIAG_TCLASS - 1)))
141 			if (nla_put_u8(skb, INET_DIAG_TCLASS,
142 				       inet6_sk(sk)->tclass) < 0)
143 				goto errout;
144 
145 		if (((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
146 		    nla_put_u8(skb, INET_DIAG_SKV6ONLY, ipv6_only_sock(sk)))
147 			goto errout;
148 	}
149 #endif
150 
151 	if (net_admin && nla_put_u32(skb, INET_DIAG_MARK, sk->sk_mark))
152 		goto errout;
153 
154 	r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
155 	r->idiag_inode = sock_i_ino(sk);
156 
157 	return 0;
158 errout:
159 	return 1;
160 }
161 EXPORT_SYMBOL_GPL(inet_diag_msg_attrs_fill);
162 
163 int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
164 		      struct sk_buff *skb, const struct inet_diag_req_v2 *req,
165 		      struct user_namespace *user_ns,
166 		      u32 portid, u32 seq, u16 nlmsg_flags,
167 		      const struct nlmsghdr *unlh,
168 		      bool net_admin)
169 {
170 	const struct tcp_congestion_ops *ca_ops;
171 	const struct inet_diag_handler *handler;
172 	int ext = req->idiag_ext;
173 	struct inet_diag_msg *r;
174 	struct nlmsghdr  *nlh;
175 	struct nlattr *attr;
176 	void *info = NULL;
177 
178 	handler = inet_diag_table[req->sdiag_protocol];
179 	BUG_ON(!handler);
180 
181 	nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
182 			nlmsg_flags);
183 	if (!nlh)
184 		return -EMSGSIZE;
185 
186 	r = nlmsg_data(nlh);
187 	BUG_ON(!sk_fullsock(sk));
188 
189 	inet_diag_msg_common_fill(r, sk);
190 	r->idiag_state = sk->sk_state;
191 	r->idiag_timer = 0;
192 	r->idiag_retrans = 0;
193 
194 	if (inet_diag_msg_attrs_fill(sk, skb, r, ext, user_ns, net_admin))
195 		goto errout;
196 
197 	if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
198 		struct inet_diag_meminfo minfo = {
199 			.idiag_rmem = sk_rmem_alloc_get(sk),
200 			.idiag_wmem = sk->sk_wmem_queued,
201 			.idiag_fmem = sk->sk_forward_alloc,
202 			.idiag_tmem = sk_wmem_alloc_get(sk),
203 		};
204 
205 		if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
206 			goto errout;
207 	}
208 
209 	if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
210 		if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
211 			goto errout;
212 
213 	/*
214 	 * RAW sockets might have user-defined protocols assigned,
215 	 * so report the one supplied on socket creation.
216 	 */
217 	if (sk->sk_type == SOCK_RAW) {
218 		if (nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))
219 			goto errout;
220 	}
221 
222 	if (!icsk) {
223 		handler->idiag_get_info(sk, r, NULL);
224 		goto out;
225 	}
226 
227 	if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
228 	    icsk->icsk_pending == ICSK_TIME_REO_TIMEOUT ||
229 	    icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
230 		r->idiag_timer = 1;
231 		r->idiag_retrans = icsk->icsk_retransmits;
232 		r->idiag_expires =
233 			jiffies_to_msecs(icsk->icsk_timeout - jiffies);
234 	} else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
235 		r->idiag_timer = 4;
236 		r->idiag_retrans = icsk->icsk_probes_out;
237 		r->idiag_expires =
238 			jiffies_to_msecs(icsk->icsk_timeout - jiffies);
239 	} else if (timer_pending(&sk->sk_timer)) {
240 		r->idiag_timer = 2;
241 		r->idiag_retrans = icsk->icsk_probes_out;
242 		r->idiag_expires =
243 			jiffies_to_msecs(sk->sk_timer.expires - jiffies);
244 	} else {
245 		r->idiag_timer = 0;
246 		r->idiag_expires = 0;
247 	}
248 
249 	if ((ext & (1 << (INET_DIAG_INFO - 1))) && handler->idiag_info_size) {
250 		attr = nla_reserve_64bit(skb, INET_DIAG_INFO,
251 					 handler->idiag_info_size,
252 					 INET_DIAG_PAD);
253 		if (!attr)
254 			goto errout;
255 
256 		info = nla_data(attr);
257 	}
258 
259 	if (ext & (1 << (INET_DIAG_CONG - 1))) {
260 		int err = 0;
261 
262 		rcu_read_lock();
263 		ca_ops = READ_ONCE(icsk->icsk_ca_ops);
264 		if (ca_ops)
265 			err = nla_put_string(skb, INET_DIAG_CONG, ca_ops->name);
266 		rcu_read_unlock();
267 		if (err < 0)
268 			goto errout;
269 	}
270 
271 	handler->idiag_get_info(sk, r, info);
272 
273 	if (ext & (1 << (INET_DIAG_INFO - 1)) && handler->idiag_get_aux)
274 		if (handler->idiag_get_aux(sk, net_admin, skb) < 0)
275 			goto errout;
276 
277 	if (sk->sk_state < TCP_TIME_WAIT) {
278 		union tcp_cc_info info;
279 		size_t sz = 0;
280 		int attr;
281 
282 		rcu_read_lock();
283 		ca_ops = READ_ONCE(icsk->icsk_ca_ops);
284 		if (ca_ops && ca_ops->get_info)
285 			sz = ca_ops->get_info(sk, ext, &attr, &info);
286 		rcu_read_unlock();
287 		if (sz && nla_put(skb, attr, sz, &info) < 0)
288 			goto errout;
289 	}
290 
291 	if (ext & (1 << (INET_DIAG_CLASS_ID - 1)) ||
292 	    ext & (1 << (INET_DIAG_TCLASS - 1))) {
293 		u32 classid = 0;
294 
295 #ifdef CONFIG_SOCK_CGROUP_DATA
296 		classid = sock_cgroup_classid(&sk->sk_cgrp_data);
297 #endif
298 		/* Fallback to socket priority if class id isn't set.
299 		 * Classful qdiscs use it as direct reference to class.
300 		 * For cgroup2 classid is always zero.
301 		 */
302 		if (!classid)
303 			classid = sk->sk_priority;
304 
305 		if (nla_put_u32(skb, INET_DIAG_CLASS_ID, classid))
306 			goto errout;
307 	}
308 
309 out:
310 	nlmsg_end(skb, nlh);
311 	return 0;
312 
313 errout:
314 	nlmsg_cancel(skb, nlh);
315 	return -EMSGSIZE;
316 }
317 EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
318 
319 static int inet_csk_diag_fill(struct sock *sk,
320 			      struct sk_buff *skb,
321 			      const struct inet_diag_req_v2 *req,
322 			      struct user_namespace *user_ns,
323 			      u32 portid, u32 seq, u16 nlmsg_flags,
324 			      const struct nlmsghdr *unlh,
325 			      bool net_admin)
326 {
327 	return inet_sk_diag_fill(sk, inet_csk(sk), skb, req, user_ns,
328 				 portid, seq, nlmsg_flags, unlh, net_admin);
329 }
330 
331 static int inet_twsk_diag_fill(struct sock *sk,
332 			       struct sk_buff *skb,
333 			       u32 portid, u32 seq, u16 nlmsg_flags,
334 			       const struct nlmsghdr *unlh)
335 {
336 	struct inet_timewait_sock *tw = inet_twsk(sk);
337 	struct inet_diag_msg *r;
338 	struct nlmsghdr *nlh;
339 	long tmo;
340 
341 	nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
342 			nlmsg_flags);
343 	if (!nlh)
344 		return -EMSGSIZE;
345 
346 	r = nlmsg_data(nlh);
347 	BUG_ON(tw->tw_state != TCP_TIME_WAIT);
348 
349 	tmo = tw->tw_timer.expires - jiffies;
350 	if (tmo < 0)
351 		tmo = 0;
352 
353 	inet_diag_msg_common_fill(r, sk);
354 	r->idiag_retrans      = 0;
355 
356 	r->idiag_state	      = tw->tw_substate;
357 	r->idiag_timer	      = 3;
358 	r->idiag_expires      = jiffies_to_msecs(tmo);
359 	r->idiag_rqueue	      = 0;
360 	r->idiag_wqueue	      = 0;
361 	r->idiag_uid	      = 0;
362 	r->idiag_inode	      = 0;
363 
364 	nlmsg_end(skb, nlh);
365 	return 0;
366 }
367 
368 static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb,
369 			      u32 portid, u32 seq, u16 nlmsg_flags,
370 			      const struct nlmsghdr *unlh, bool net_admin)
371 {
372 	struct request_sock *reqsk = inet_reqsk(sk);
373 	struct inet_diag_msg *r;
374 	struct nlmsghdr *nlh;
375 	long tmo;
376 
377 	nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
378 			nlmsg_flags);
379 	if (!nlh)
380 		return -EMSGSIZE;
381 
382 	r = nlmsg_data(nlh);
383 	inet_diag_msg_common_fill(r, sk);
384 	r->idiag_state = TCP_SYN_RECV;
385 	r->idiag_timer = 1;
386 	r->idiag_retrans = reqsk->num_retrans;
387 
388 	BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) !=
389 		     offsetof(struct sock, sk_cookie));
390 
391 	tmo = inet_reqsk(sk)->rsk_timer.expires - jiffies;
392 	r->idiag_expires = (tmo >= 0) ? jiffies_to_msecs(tmo) : 0;
393 	r->idiag_rqueue	= 0;
394 	r->idiag_wqueue	= 0;
395 	r->idiag_uid	= 0;
396 	r->idiag_inode	= 0;
397 
398 	if (net_admin && nla_put_u32(skb, INET_DIAG_MARK,
399 				     inet_rsk(reqsk)->ir_mark))
400 		return -EMSGSIZE;
401 
402 	nlmsg_end(skb, nlh);
403 	return 0;
404 }
405 
406 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
407 			const struct inet_diag_req_v2 *r,
408 			struct user_namespace *user_ns,
409 			u32 portid, u32 seq, u16 nlmsg_flags,
410 			const struct nlmsghdr *unlh, bool net_admin)
411 {
412 	if (sk->sk_state == TCP_TIME_WAIT)
413 		return inet_twsk_diag_fill(sk, skb, portid, seq,
414 					   nlmsg_flags, unlh);
415 
416 	if (sk->sk_state == TCP_NEW_SYN_RECV)
417 		return inet_req_diag_fill(sk, skb, portid, seq,
418 					  nlmsg_flags, unlh, net_admin);
419 
420 	return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq,
421 				  nlmsg_flags, unlh, net_admin);
422 }
423 
424 struct sock *inet_diag_find_one_icsk(struct net *net,
425 				     struct inet_hashinfo *hashinfo,
426 				     const struct inet_diag_req_v2 *req)
427 {
428 	struct sock *sk;
429 
430 	rcu_read_lock();
431 	if (req->sdiag_family == AF_INET)
432 		sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[0],
433 				 req->id.idiag_dport, req->id.idiag_src[0],
434 				 req->id.idiag_sport, req->id.idiag_if);
435 #if IS_ENABLED(CONFIG_IPV6)
436 	else if (req->sdiag_family == AF_INET6) {
437 		if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) &&
438 		    ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src))
439 			sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[3],
440 					 req->id.idiag_dport, req->id.idiag_src[3],
441 					 req->id.idiag_sport, req->id.idiag_if);
442 		else
443 			sk = inet6_lookup(net, hashinfo, NULL, 0,
444 					  (struct in6_addr *)req->id.idiag_dst,
445 					  req->id.idiag_dport,
446 					  (struct in6_addr *)req->id.idiag_src,
447 					  req->id.idiag_sport,
448 					  req->id.idiag_if);
449 	}
450 #endif
451 	else {
452 		rcu_read_unlock();
453 		return ERR_PTR(-EINVAL);
454 	}
455 	rcu_read_unlock();
456 	if (!sk)
457 		return ERR_PTR(-ENOENT);
458 
459 	if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) {
460 		sock_gen_put(sk);
461 		return ERR_PTR(-ENOENT);
462 	}
463 
464 	return sk;
465 }
466 EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk);
467 
468 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo,
469 			    struct sk_buff *in_skb,
470 			    const struct nlmsghdr *nlh,
471 			    const struct inet_diag_req_v2 *req)
472 {
473 	bool net_admin = netlink_net_capable(in_skb, CAP_NET_ADMIN);
474 	struct net *net = sock_net(in_skb->sk);
475 	struct sk_buff *rep;
476 	struct sock *sk;
477 	int err;
478 
479 	sk = inet_diag_find_one_icsk(net, hashinfo, req);
480 	if (IS_ERR(sk))
481 		return PTR_ERR(sk);
482 
483 	rep = nlmsg_new(inet_sk_attr_size(sk, req, net_admin), GFP_KERNEL);
484 	if (!rep) {
485 		err = -ENOMEM;
486 		goto out;
487 	}
488 
489 	err = sk_diag_fill(sk, rep, req,
490 			   sk_user_ns(NETLINK_CB(in_skb).sk),
491 			   NETLINK_CB(in_skb).portid,
492 			   nlh->nlmsg_seq, 0, nlh, net_admin);
493 	if (err < 0) {
494 		WARN_ON(err == -EMSGSIZE);
495 		nlmsg_free(rep);
496 		goto out;
497 	}
498 	err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
499 			      MSG_DONTWAIT);
500 	if (err > 0)
501 		err = 0;
502 
503 out:
504 	if (sk)
505 		sock_gen_put(sk);
506 
507 	return err;
508 }
509 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
510 
511 static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb,
512 			       const struct nlmsghdr *nlh,
513 			       const struct inet_diag_req_v2 *req)
514 {
515 	const struct inet_diag_handler *handler;
516 	int err;
517 
518 	handler = inet_diag_lock_handler(req->sdiag_protocol);
519 	if (IS_ERR(handler))
520 		err = PTR_ERR(handler);
521 	else if (cmd == SOCK_DIAG_BY_FAMILY)
522 		err = handler->dump_one(in_skb, nlh, req);
523 	else if (cmd == SOCK_DESTROY && handler->destroy)
524 		err = handler->destroy(in_skb, req);
525 	else
526 		err = -EOPNOTSUPP;
527 	inet_diag_unlock_handler(handler);
528 
529 	return err;
530 }
531 
532 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
533 {
534 	int words = bits >> 5;
535 
536 	bits &= 0x1f;
537 
538 	if (words) {
539 		if (memcmp(a1, a2, words << 2))
540 			return 0;
541 	}
542 	if (bits) {
543 		__be32 w1, w2;
544 		__be32 mask;
545 
546 		w1 = a1[words];
547 		w2 = a2[words];
548 
549 		mask = htonl((0xffffffff) << (32 - bits));
550 
551 		if ((w1 ^ w2) & mask)
552 			return 0;
553 	}
554 
555 	return 1;
556 }
557 
558 static int inet_diag_bc_run(const struct nlattr *_bc,
559 			    const struct inet_diag_entry *entry)
560 {
561 	const void *bc = nla_data(_bc);
562 	int len = nla_len(_bc);
563 
564 	while (len > 0) {
565 		int yes = 1;
566 		const struct inet_diag_bc_op *op = bc;
567 
568 		switch (op->code) {
569 		case INET_DIAG_BC_NOP:
570 			break;
571 		case INET_DIAG_BC_JMP:
572 			yes = 0;
573 			break;
574 		case INET_DIAG_BC_S_EQ:
575 			yes = entry->sport == op[1].no;
576 			break;
577 		case INET_DIAG_BC_S_GE:
578 			yes = entry->sport >= op[1].no;
579 			break;
580 		case INET_DIAG_BC_S_LE:
581 			yes = entry->sport <= op[1].no;
582 			break;
583 		case INET_DIAG_BC_D_EQ:
584 			yes = entry->dport == op[1].no;
585 			break;
586 		case INET_DIAG_BC_D_GE:
587 			yes = entry->dport >= op[1].no;
588 			break;
589 		case INET_DIAG_BC_D_LE:
590 			yes = entry->dport <= op[1].no;
591 			break;
592 		case INET_DIAG_BC_AUTO:
593 			yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
594 			break;
595 		case INET_DIAG_BC_S_COND:
596 		case INET_DIAG_BC_D_COND: {
597 			const struct inet_diag_hostcond *cond;
598 			const __be32 *addr;
599 
600 			cond = (const struct inet_diag_hostcond *)(op + 1);
601 			if (cond->port != -1 &&
602 			    cond->port != (op->code == INET_DIAG_BC_S_COND ?
603 					     entry->sport : entry->dport)) {
604 				yes = 0;
605 				break;
606 			}
607 
608 			if (op->code == INET_DIAG_BC_S_COND)
609 				addr = entry->saddr;
610 			else
611 				addr = entry->daddr;
612 
613 			if (cond->family != AF_UNSPEC &&
614 			    cond->family != entry->family) {
615 				if (entry->family == AF_INET6 &&
616 				    cond->family == AF_INET) {
617 					if (addr[0] == 0 && addr[1] == 0 &&
618 					    addr[2] == htonl(0xffff) &&
619 					    bitstring_match(addr + 3,
620 							    cond->addr,
621 							    cond->prefix_len))
622 						break;
623 				}
624 				yes = 0;
625 				break;
626 			}
627 
628 			if (cond->prefix_len == 0)
629 				break;
630 			if (bitstring_match(addr, cond->addr,
631 					    cond->prefix_len))
632 				break;
633 			yes = 0;
634 			break;
635 		}
636 		case INET_DIAG_BC_DEV_COND: {
637 			u32 ifindex;
638 
639 			ifindex = *((const u32 *)(op + 1));
640 			if (ifindex != entry->ifindex)
641 				yes = 0;
642 			break;
643 		}
644 		case INET_DIAG_BC_MARK_COND: {
645 			struct inet_diag_markcond *cond;
646 
647 			cond = (struct inet_diag_markcond *)(op + 1);
648 			if ((entry->mark & cond->mask) != cond->mark)
649 				yes = 0;
650 			break;
651 		}
652 		}
653 
654 		if (yes) {
655 			len -= op->yes;
656 			bc += op->yes;
657 		} else {
658 			len -= op->no;
659 			bc += op->no;
660 		}
661 	}
662 	return len == 0;
663 }
664 
665 /* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV)
666  */
667 static void entry_fill_addrs(struct inet_diag_entry *entry,
668 			     const struct sock *sk)
669 {
670 #if IS_ENABLED(CONFIG_IPV6)
671 	if (sk->sk_family == AF_INET6) {
672 		entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32;
673 		entry->daddr = sk->sk_v6_daddr.s6_addr32;
674 	} else
675 #endif
676 	{
677 		entry->saddr = &sk->sk_rcv_saddr;
678 		entry->daddr = &sk->sk_daddr;
679 	}
680 }
681 
682 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
683 {
684 	struct inet_sock *inet = inet_sk(sk);
685 	struct inet_diag_entry entry;
686 
687 	if (!bc)
688 		return 1;
689 
690 	entry.family = sk->sk_family;
691 	entry_fill_addrs(&entry, sk);
692 	entry.sport = inet->inet_num;
693 	entry.dport = ntohs(inet->inet_dport);
694 	entry.ifindex = sk->sk_bound_dev_if;
695 	entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0;
696 	if (sk_fullsock(sk))
697 		entry.mark = sk->sk_mark;
698 	else if (sk->sk_state == TCP_NEW_SYN_RECV)
699 		entry.mark = inet_rsk(inet_reqsk(sk))->ir_mark;
700 	else
701 		entry.mark = 0;
702 
703 	return inet_diag_bc_run(bc, &entry);
704 }
705 EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
706 
707 static int valid_cc(const void *bc, int len, int cc)
708 {
709 	while (len >= 0) {
710 		const struct inet_diag_bc_op *op = bc;
711 
712 		if (cc > len)
713 			return 0;
714 		if (cc == len)
715 			return 1;
716 		if (op->yes < 4 || op->yes & 3)
717 			return 0;
718 		len -= op->yes;
719 		bc  += op->yes;
720 	}
721 	return 0;
722 }
723 
724 /* data is u32 ifindex */
725 static bool valid_devcond(const struct inet_diag_bc_op *op, int len,
726 			  int *min_len)
727 {
728 	/* Check ifindex space. */
729 	*min_len += sizeof(u32);
730 	if (len < *min_len)
731 		return false;
732 
733 	return true;
734 }
735 /* Validate an inet_diag_hostcond. */
736 static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
737 			   int *min_len)
738 {
739 	struct inet_diag_hostcond *cond;
740 	int addr_len;
741 
742 	/* Check hostcond space. */
743 	*min_len += sizeof(struct inet_diag_hostcond);
744 	if (len < *min_len)
745 		return false;
746 	cond = (struct inet_diag_hostcond *)(op + 1);
747 
748 	/* Check address family and address length. */
749 	switch (cond->family) {
750 	case AF_UNSPEC:
751 		addr_len = 0;
752 		break;
753 	case AF_INET:
754 		addr_len = sizeof(struct in_addr);
755 		break;
756 	case AF_INET6:
757 		addr_len = sizeof(struct in6_addr);
758 		break;
759 	default:
760 		return false;
761 	}
762 	*min_len += addr_len;
763 	if (len < *min_len)
764 		return false;
765 
766 	/* Check prefix length (in bits) vs address length (in bytes). */
767 	if (cond->prefix_len > 8 * addr_len)
768 		return false;
769 
770 	return true;
771 }
772 
773 /* Validate a port comparison operator. */
774 static bool valid_port_comparison(const struct inet_diag_bc_op *op,
775 				  int len, int *min_len)
776 {
777 	/* Port comparisons put the port in a follow-on inet_diag_bc_op. */
778 	*min_len += sizeof(struct inet_diag_bc_op);
779 	if (len < *min_len)
780 		return false;
781 	return true;
782 }
783 
784 static bool valid_markcond(const struct inet_diag_bc_op *op, int len,
785 			   int *min_len)
786 {
787 	*min_len += sizeof(struct inet_diag_markcond);
788 	return len >= *min_len;
789 }
790 
791 static int inet_diag_bc_audit(const struct nlattr *attr,
792 			      const struct sk_buff *skb)
793 {
794 	bool net_admin = netlink_net_capable(skb, CAP_NET_ADMIN);
795 	const void *bytecode, *bc;
796 	int bytecode_len, len;
797 
798 	if (!attr || nla_len(attr) < sizeof(struct inet_diag_bc_op))
799 		return -EINVAL;
800 
801 	bytecode = bc = nla_data(attr);
802 	len = bytecode_len = nla_len(attr);
803 
804 	while (len > 0) {
805 		int min_len = sizeof(struct inet_diag_bc_op);
806 		const struct inet_diag_bc_op *op = bc;
807 
808 		switch (op->code) {
809 		case INET_DIAG_BC_S_COND:
810 		case INET_DIAG_BC_D_COND:
811 			if (!valid_hostcond(bc, len, &min_len))
812 				return -EINVAL;
813 			break;
814 		case INET_DIAG_BC_DEV_COND:
815 			if (!valid_devcond(bc, len, &min_len))
816 				return -EINVAL;
817 			break;
818 		case INET_DIAG_BC_S_EQ:
819 		case INET_DIAG_BC_S_GE:
820 		case INET_DIAG_BC_S_LE:
821 		case INET_DIAG_BC_D_EQ:
822 		case INET_DIAG_BC_D_GE:
823 		case INET_DIAG_BC_D_LE:
824 			if (!valid_port_comparison(bc, len, &min_len))
825 				return -EINVAL;
826 			break;
827 		case INET_DIAG_BC_MARK_COND:
828 			if (!net_admin)
829 				return -EPERM;
830 			if (!valid_markcond(bc, len, &min_len))
831 				return -EINVAL;
832 			break;
833 		case INET_DIAG_BC_AUTO:
834 		case INET_DIAG_BC_JMP:
835 		case INET_DIAG_BC_NOP:
836 			break;
837 		default:
838 			return -EINVAL;
839 		}
840 
841 		if (op->code != INET_DIAG_BC_NOP) {
842 			if (op->no < min_len || op->no > len + 4 || op->no & 3)
843 				return -EINVAL;
844 			if (op->no < len &&
845 			    !valid_cc(bytecode, bytecode_len, len - op->no))
846 				return -EINVAL;
847 		}
848 
849 		if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
850 			return -EINVAL;
851 		bc  += op->yes;
852 		len -= op->yes;
853 	}
854 	return len == 0 ? 0 : -EINVAL;
855 }
856 
857 static int inet_csk_diag_dump(struct sock *sk,
858 			      struct sk_buff *skb,
859 			      struct netlink_callback *cb,
860 			      const struct inet_diag_req_v2 *r,
861 			      const struct nlattr *bc,
862 			      bool net_admin)
863 {
864 	if (!inet_diag_bc_sk(bc, sk))
865 		return 0;
866 
867 	return inet_csk_diag_fill(sk, skb, r,
868 				  sk_user_ns(NETLINK_CB(cb->skb).sk),
869 				  NETLINK_CB(cb->skb).portid,
870 				  cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh,
871 				  net_admin);
872 }
873 
874 static void twsk_build_assert(void)
875 {
876 	BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) !=
877 		     offsetof(struct sock, sk_family));
878 
879 	BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) !=
880 		     offsetof(struct inet_sock, inet_num));
881 
882 	BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) !=
883 		     offsetof(struct inet_sock, inet_dport));
884 
885 	BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) !=
886 		     offsetof(struct inet_sock, inet_rcv_saddr));
887 
888 	BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) !=
889 		     offsetof(struct inet_sock, inet_daddr));
890 
891 #if IS_ENABLED(CONFIG_IPV6)
892 	BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) !=
893 		     offsetof(struct sock, sk_v6_rcv_saddr));
894 
895 	BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) !=
896 		     offsetof(struct sock, sk_v6_daddr));
897 #endif
898 }
899 
900 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
901 			 struct netlink_callback *cb,
902 			 const struct inet_diag_req_v2 *r, struct nlattr *bc)
903 {
904 	bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
905 	struct net *net = sock_net(skb->sk);
906 	u32 idiag_states = r->idiag_states;
907 	int i, num, s_i, s_num;
908 	struct sock *sk;
909 
910 	if (idiag_states & TCPF_SYN_RECV)
911 		idiag_states |= TCPF_NEW_SYN_RECV;
912 	s_i = cb->args[1];
913 	s_num = num = cb->args[2];
914 
915 	if (cb->args[0] == 0) {
916 		if (!(idiag_states & TCPF_LISTEN) || r->id.idiag_dport)
917 			goto skip_listen_ht;
918 
919 		for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
920 			struct inet_listen_hashbucket *ilb;
921 
922 			num = 0;
923 			ilb = &hashinfo->listening_hash[i];
924 			spin_lock(&ilb->lock);
925 			sk_for_each(sk, &ilb->head) {
926 				struct inet_sock *inet = inet_sk(sk);
927 
928 				if (!net_eq(sock_net(sk), net))
929 					continue;
930 
931 				if (num < s_num) {
932 					num++;
933 					continue;
934 				}
935 
936 				if (r->sdiag_family != AF_UNSPEC &&
937 				    sk->sk_family != r->sdiag_family)
938 					goto next_listen;
939 
940 				if (r->id.idiag_sport != inet->inet_sport &&
941 				    r->id.idiag_sport)
942 					goto next_listen;
943 
944 				if (inet_csk_diag_dump(sk, skb, cb, r,
945 						       bc, net_admin) < 0) {
946 					spin_unlock(&ilb->lock);
947 					goto done;
948 				}
949 
950 next_listen:
951 				++num;
952 			}
953 			spin_unlock(&ilb->lock);
954 
955 			s_num = 0;
956 		}
957 skip_listen_ht:
958 		cb->args[0] = 1;
959 		s_i = num = s_num = 0;
960 	}
961 
962 	if (!(idiag_states & ~TCPF_LISTEN))
963 		goto out;
964 
965 #define SKARR_SZ 16
966 	for (i = s_i; i <= hashinfo->ehash_mask; i++) {
967 		struct inet_ehash_bucket *head = &hashinfo->ehash[i];
968 		spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
969 		struct hlist_nulls_node *node;
970 		struct sock *sk_arr[SKARR_SZ];
971 		int num_arr[SKARR_SZ];
972 		int idx, accum, res;
973 
974 		if (hlist_nulls_empty(&head->chain))
975 			continue;
976 
977 		if (i > s_i)
978 			s_num = 0;
979 
980 next_chunk:
981 		num = 0;
982 		accum = 0;
983 		spin_lock_bh(lock);
984 		sk_nulls_for_each(sk, node, &head->chain) {
985 			int state;
986 
987 			if (!net_eq(sock_net(sk), net))
988 				continue;
989 			if (num < s_num)
990 				goto next_normal;
991 			state = (sk->sk_state == TCP_TIME_WAIT) ?
992 				inet_twsk(sk)->tw_substate : sk->sk_state;
993 			if (!(idiag_states & (1 << state)))
994 				goto next_normal;
995 			if (r->sdiag_family != AF_UNSPEC &&
996 			    sk->sk_family != r->sdiag_family)
997 				goto next_normal;
998 			if (r->id.idiag_sport != htons(sk->sk_num) &&
999 			    r->id.idiag_sport)
1000 				goto next_normal;
1001 			if (r->id.idiag_dport != sk->sk_dport &&
1002 			    r->id.idiag_dport)
1003 				goto next_normal;
1004 			twsk_build_assert();
1005 
1006 			if (!inet_diag_bc_sk(bc, sk))
1007 				goto next_normal;
1008 
1009 			if (!refcount_inc_not_zero(&sk->sk_refcnt))
1010 				goto next_normal;
1011 
1012 			num_arr[accum] = num;
1013 			sk_arr[accum] = sk;
1014 			if (++accum == SKARR_SZ)
1015 				break;
1016 next_normal:
1017 			++num;
1018 		}
1019 		spin_unlock_bh(lock);
1020 		res = 0;
1021 		for (idx = 0; idx < accum; idx++) {
1022 			if (res >= 0) {
1023 				res = sk_diag_fill(sk_arr[idx], skb, r,
1024 					   sk_user_ns(NETLINK_CB(cb->skb).sk),
1025 					   NETLINK_CB(cb->skb).portid,
1026 					   cb->nlh->nlmsg_seq, NLM_F_MULTI,
1027 					   cb->nlh, net_admin);
1028 				if (res < 0)
1029 					num = num_arr[idx];
1030 			}
1031 			sock_gen_put(sk_arr[idx]);
1032 		}
1033 		if (res < 0)
1034 			break;
1035 		cond_resched();
1036 		if (accum == SKARR_SZ) {
1037 			s_num = num + 1;
1038 			goto next_chunk;
1039 		}
1040 	}
1041 
1042 done:
1043 	cb->args[1] = i;
1044 	cb->args[2] = num;
1045 out:
1046 	;
1047 }
1048 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
1049 
1050 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
1051 			    const struct inet_diag_req_v2 *r,
1052 			    struct nlattr *bc)
1053 {
1054 	const struct inet_diag_handler *handler;
1055 	int err = 0;
1056 
1057 	handler = inet_diag_lock_handler(r->sdiag_protocol);
1058 	if (!IS_ERR(handler))
1059 		handler->dump(skb, cb, r, bc);
1060 	else
1061 		err = PTR_ERR(handler);
1062 	inet_diag_unlock_handler(handler);
1063 
1064 	return err ? : skb->len;
1065 }
1066 
1067 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
1068 {
1069 	int hdrlen = sizeof(struct inet_diag_req_v2);
1070 	struct nlattr *bc = NULL;
1071 
1072 	if (nlmsg_attrlen(cb->nlh, hdrlen))
1073 		bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1074 
1075 	return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
1076 }
1077 
1078 static int inet_diag_type2proto(int type)
1079 {
1080 	switch (type) {
1081 	case TCPDIAG_GETSOCK:
1082 		return IPPROTO_TCP;
1083 	case DCCPDIAG_GETSOCK:
1084 		return IPPROTO_DCCP;
1085 	default:
1086 		return 0;
1087 	}
1088 }
1089 
1090 static int inet_diag_dump_compat(struct sk_buff *skb,
1091 				 struct netlink_callback *cb)
1092 {
1093 	struct inet_diag_req *rc = nlmsg_data(cb->nlh);
1094 	int hdrlen = sizeof(struct inet_diag_req);
1095 	struct inet_diag_req_v2 req;
1096 	struct nlattr *bc = NULL;
1097 
1098 	req.sdiag_family = AF_UNSPEC; /* compatibility */
1099 	req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
1100 	req.idiag_ext = rc->idiag_ext;
1101 	req.idiag_states = rc->idiag_states;
1102 	req.id = rc->id;
1103 
1104 	if (nlmsg_attrlen(cb->nlh, hdrlen))
1105 		bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1106 
1107 	return __inet_diag_dump(skb, cb, &req, bc);
1108 }
1109 
1110 static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
1111 				      const struct nlmsghdr *nlh)
1112 {
1113 	struct inet_diag_req *rc = nlmsg_data(nlh);
1114 	struct inet_diag_req_v2 req;
1115 
1116 	req.sdiag_family = rc->idiag_family;
1117 	req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
1118 	req.idiag_ext = rc->idiag_ext;
1119 	req.idiag_states = rc->idiag_states;
1120 	req.id = rc->id;
1121 
1122 	return inet_diag_cmd_exact(SOCK_DIAG_BY_FAMILY, in_skb, nlh, &req);
1123 }
1124 
1125 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
1126 {
1127 	int hdrlen = sizeof(struct inet_diag_req);
1128 	struct net *net = sock_net(skb->sk);
1129 
1130 	if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
1131 	    nlmsg_len(nlh) < hdrlen)
1132 		return -EINVAL;
1133 
1134 	if (nlh->nlmsg_flags & NLM_F_DUMP) {
1135 		if (nlmsg_attrlen(nlh, hdrlen)) {
1136 			struct nlattr *attr;
1137 			int err;
1138 
1139 			attr = nlmsg_find_attr(nlh, hdrlen,
1140 					       INET_DIAG_REQ_BYTECODE);
1141 			err = inet_diag_bc_audit(attr, skb);
1142 			if (err)
1143 				return err;
1144 		}
1145 		{
1146 			struct netlink_dump_control c = {
1147 				.dump = inet_diag_dump_compat,
1148 			};
1149 			return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
1150 		}
1151 	}
1152 
1153 	return inet_diag_get_exact_compat(skb, nlh);
1154 }
1155 
1156 static int inet_diag_handler_cmd(struct sk_buff *skb, struct nlmsghdr *h)
1157 {
1158 	int hdrlen = sizeof(struct inet_diag_req_v2);
1159 	struct net *net = sock_net(skb->sk);
1160 
1161 	if (nlmsg_len(h) < hdrlen)
1162 		return -EINVAL;
1163 
1164 	if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
1165 	    h->nlmsg_flags & NLM_F_DUMP) {
1166 		if (nlmsg_attrlen(h, hdrlen)) {
1167 			struct nlattr *attr;
1168 			int err;
1169 
1170 			attr = nlmsg_find_attr(h, hdrlen,
1171 					       INET_DIAG_REQ_BYTECODE);
1172 			err = inet_diag_bc_audit(attr, skb);
1173 			if (err)
1174 				return err;
1175 		}
1176 		{
1177 			struct netlink_dump_control c = {
1178 				.dump = inet_diag_dump,
1179 			};
1180 			return netlink_dump_start(net->diag_nlsk, skb, h, &c);
1181 		}
1182 	}
1183 
1184 	return inet_diag_cmd_exact(h->nlmsg_type, skb, h, nlmsg_data(h));
1185 }
1186 
1187 static
1188 int inet_diag_handler_get_info(struct sk_buff *skb, struct sock *sk)
1189 {
1190 	const struct inet_diag_handler *handler;
1191 	struct nlmsghdr *nlh;
1192 	struct nlattr *attr;
1193 	struct inet_diag_msg *r;
1194 	void *info = NULL;
1195 	int err = 0;
1196 
1197 	nlh = nlmsg_put(skb, 0, 0, SOCK_DIAG_BY_FAMILY, sizeof(*r), 0);
1198 	if (!nlh)
1199 		return -ENOMEM;
1200 
1201 	r = nlmsg_data(nlh);
1202 	memset(r, 0, sizeof(*r));
1203 	inet_diag_msg_common_fill(r, sk);
1204 	if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_STREAM)
1205 		r->id.idiag_sport = inet_sk(sk)->inet_sport;
1206 	r->idiag_state = sk->sk_state;
1207 
1208 	if ((err = nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))) {
1209 		nlmsg_cancel(skb, nlh);
1210 		return err;
1211 	}
1212 
1213 	handler = inet_diag_lock_handler(sk->sk_protocol);
1214 	if (IS_ERR(handler)) {
1215 		inet_diag_unlock_handler(handler);
1216 		nlmsg_cancel(skb, nlh);
1217 		return PTR_ERR(handler);
1218 	}
1219 
1220 	attr = handler->idiag_info_size
1221 		? nla_reserve_64bit(skb, INET_DIAG_INFO,
1222 				    handler->idiag_info_size,
1223 				    INET_DIAG_PAD)
1224 		: NULL;
1225 	if (attr)
1226 		info = nla_data(attr);
1227 
1228 	handler->idiag_get_info(sk, r, info);
1229 	inet_diag_unlock_handler(handler);
1230 
1231 	nlmsg_end(skb, nlh);
1232 	return 0;
1233 }
1234 
1235 static const struct sock_diag_handler inet_diag_handler = {
1236 	.family = AF_INET,
1237 	.dump = inet_diag_handler_cmd,
1238 	.get_info = inet_diag_handler_get_info,
1239 	.destroy = inet_diag_handler_cmd,
1240 };
1241 
1242 static const struct sock_diag_handler inet6_diag_handler = {
1243 	.family = AF_INET6,
1244 	.dump = inet_diag_handler_cmd,
1245 	.get_info = inet_diag_handler_get_info,
1246 	.destroy = inet_diag_handler_cmd,
1247 };
1248 
1249 int inet_diag_register(const struct inet_diag_handler *h)
1250 {
1251 	const __u16 type = h->idiag_type;
1252 	int err = -EINVAL;
1253 
1254 	if (type >= IPPROTO_MAX)
1255 		goto out;
1256 
1257 	mutex_lock(&inet_diag_table_mutex);
1258 	err = -EEXIST;
1259 	if (!inet_diag_table[type]) {
1260 		inet_diag_table[type] = h;
1261 		err = 0;
1262 	}
1263 	mutex_unlock(&inet_diag_table_mutex);
1264 out:
1265 	return err;
1266 }
1267 EXPORT_SYMBOL_GPL(inet_diag_register);
1268 
1269 void inet_diag_unregister(const struct inet_diag_handler *h)
1270 {
1271 	const __u16 type = h->idiag_type;
1272 
1273 	if (type >= IPPROTO_MAX)
1274 		return;
1275 
1276 	mutex_lock(&inet_diag_table_mutex);
1277 	inet_diag_table[type] = NULL;
1278 	mutex_unlock(&inet_diag_table_mutex);
1279 }
1280 EXPORT_SYMBOL_GPL(inet_diag_unregister);
1281 
1282 static int __init inet_diag_init(void)
1283 {
1284 	const int inet_diag_table_size = (IPPROTO_MAX *
1285 					  sizeof(struct inet_diag_handler *));
1286 	int err = -ENOMEM;
1287 
1288 	inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1289 	if (!inet_diag_table)
1290 		goto out;
1291 
1292 	err = sock_diag_register(&inet_diag_handler);
1293 	if (err)
1294 		goto out_free_nl;
1295 
1296 	err = sock_diag_register(&inet6_diag_handler);
1297 	if (err)
1298 		goto out_free_inet;
1299 
1300 	sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1301 out:
1302 	return err;
1303 
1304 out_free_inet:
1305 	sock_diag_unregister(&inet_diag_handler);
1306 out_free_nl:
1307 	kfree(inet_diag_table);
1308 	goto out;
1309 }
1310 
1311 static void __exit inet_diag_exit(void)
1312 {
1313 	sock_diag_unregister(&inet6_diag_handler);
1314 	sock_diag_unregister(&inet_diag_handler);
1315 	sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1316 	kfree(inet_diag_table);
1317 }
1318 
1319 module_init(inet_diag_init);
1320 module_exit(inet_diag_exit);
1321 MODULE_LICENSE("GPL");
1322 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1323 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);
1324