xref: /openbmc/linux/net/ipv4/inet_diag.c (revision 69fad28c) 
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(sizeof(struct inet_diag_meminfo))
112 		+ nla_total_size(sizeof(struct inet_diag_msg))
113 		+ nla_total_size(SK_MEMINFO_VARS * sizeof(u32))
114 		+ nla_total_size(TCP_CA_NAME_MAX)
115 		+ nla_total_size(sizeof(struct tcpvegas_info))
116 		+ aux
117 		+ 64;
118 }
119 
120 int inet_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb,
121 			     struct inet_diag_msg *r, int ext,
122 			     struct user_namespace *user_ns,
123 			     bool net_admin)
124 {
125 	const struct inet_sock *inet = inet_sk(sk);
126 
127 	if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown))
128 		goto errout;
129 
130 	/* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
131 	 * hence this needs to be included regardless of socket family.
132 	 */
133 	if (ext & (1 << (INET_DIAG_TOS - 1)))
134 		if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0)
135 			goto errout;
136 
137 #if IS_ENABLED(CONFIG_IPV6)
138 	if (r->idiag_family == AF_INET6) {
139 		if (ext & (1 << (INET_DIAG_TCLASS - 1)))
140 			if (nla_put_u8(skb, INET_DIAG_TCLASS,
141 				       inet6_sk(sk)->tclass) < 0)
142 				goto errout;
143 
144 		if (((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
145 		    nla_put_u8(skb, INET_DIAG_SKV6ONLY, ipv6_only_sock(sk)))
146 			goto errout;
147 	}
148 #endif
149 
150 	if (net_admin && nla_put_u32(skb, INET_DIAG_MARK, sk->sk_mark))
151 		goto errout;
152 
153 	r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
154 	r->idiag_inode = sock_i_ino(sk);
155 
156 	return 0;
157 errout:
158 	return 1;
159 }
160 EXPORT_SYMBOL_GPL(inet_diag_msg_attrs_fill);
161 
162 int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
163 		      struct sk_buff *skb, const struct inet_diag_req_v2 *req,
164 		      struct user_namespace *user_ns,
165 		      u32 portid, u32 seq, u16 nlmsg_flags,
166 		      const struct nlmsghdr *unlh,
167 		      bool net_admin)
168 {
169 	const struct tcp_congestion_ops *ca_ops;
170 	const struct inet_diag_handler *handler;
171 	int ext = req->idiag_ext;
172 	struct inet_diag_msg *r;
173 	struct nlmsghdr  *nlh;
174 	struct nlattr *attr;
175 	void *info = NULL;
176 
177 	handler = inet_diag_table[req->sdiag_protocol];
178 	BUG_ON(!handler);
179 
180 	nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
181 			nlmsg_flags);
182 	if (!nlh)
183 		return -EMSGSIZE;
184 
185 	r = nlmsg_data(nlh);
186 	BUG_ON(!sk_fullsock(sk));
187 
188 	inet_diag_msg_common_fill(r, sk);
189 	r->idiag_state = sk->sk_state;
190 	r->idiag_timer = 0;
191 	r->idiag_retrans = 0;
192 
193 	if (inet_diag_msg_attrs_fill(sk, skb, r, ext, user_ns, net_admin))
194 		goto errout;
195 
196 	if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
197 		struct inet_diag_meminfo minfo = {
198 			.idiag_rmem = sk_rmem_alloc_get(sk),
199 			.idiag_wmem = sk->sk_wmem_queued,
200 			.idiag_fmem = sk->sk_forward_alloc,
201 			.idiag_tmem = sk_wmem_alloc_get(sk),
202 		};
203 
204 		if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
205 			goto errout;
206 	}
207 
208 	if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
209 		if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
210 			goto errout;
211 
212 	/*
213 	 * RAW sockets might have user-defined protocols assigned,
214 	 * so report the one supplied on socket creation.
215 	 */
216 	if (sk->sk_type == SOCK_RAW) {
217 		if (nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))
218 			goto errout;
219 	}
220 
221 	if (!icsk) {
222 		handler->idiag_get_info(sk, r, NULL);
223 		goto out;
224 	}
225 
226 	if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
227 	    icsk->icsk_pending == ICSK_TIME_REO_TIMEOUT ||
228 	    icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
229 		r->idiag_timer = 1;
230 		r->idiag_retrans = icsk->icsk_retransmits;
231 		r->idiag_expires =
232 			jiffies_to_msecs(icsk->icsk_timeout - jiffies);
233 	} else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
234 		r->idiag_timer = 4;
235 		r->idiag_retrans = icsk->icsk_probes_out;
236 		r->idiag_expires =
237 			jiffies_to_msecs(icsk->icsk_timeout - jiffies);
238 	} else if (timer_pending(&sk->sk_timer)) {
239 		r->idiag_timer = 2;
240 		r->idiag_retrans = icsk->icsk_probes_out;
241 		r->idiag_expires =
242 			jiffies_to_msecs(sk->sk_timer.expires - jiffies);
243 	} else {
244 		r->idiag_timer = 0;
245 		r->idiag_expires = 0;
246 	}
247 
248 	if ((ext & (1 << (INET_DIAG_INFO - 1))) && handler->idiag_info_size) {
249 		attr = nla_reserve_64bit(skb, INET_DIAG_INFO,
250 					 handler->idiag_info_size,
251 					 INET_DIAG_PAD);
252 		if (!attr)
253 			goto errout;
254 
255 		info = nla_data(attr);
256 	}
257 
258 	if (ext & (1 << (INET_DIAG_CONG - 1))) {
259 		int err = 0;
260 
261 		rcu_read_lock();
262 		ca_ops = READ_ONCE(icsk->icsk_ca_ops);
263 		if (ca_ops)
264 			err = nla_put_string(skb, INET_DIAG_CONG, ca_ops->name);
265 		rcu_read_unlock();
266 		if (err < 0)
267 			goto errout;
268 	}
269 
270 	handler->idiag_get_info(sk, r, info);
271 
272 	if (ext & (1 << (INET_DIAG_INFO - 1)) && handler->idiag_get_aux)
273 		if (handler->idiag_get_aux(sk, net_admin, skb) < 0)
274 			goto errout;
275 
276 	if (sk->sk_state < TCP_TIME_WAIT) {
277 		union tcp_cc_info info;
278 		size_t sz = 0;
279 		int attr;
280 
281 		rcu_read_lock();
282 		ca_ops = READ_ONCE(icsk->icsk_ca_ops);
283 		if (ca_ops && ca_ops->get_info)
284 			sz = ca_ops->get_info(sk, ext, &attr, &info);
285 		rcu_read_unlock();
286 		if (sz && nla_put(skb, attr, sz, &info) < 0)
287 			goto errout;
288 	}
289 
290 	if (ext & (1 << (INET_DIAG_CLASS_ID - 1))) {
291 		u32 classid = 0;
292 
293 #ifdef CONFIG_SOCK_CGROUP_DATA
294 		classid = sock_cgroup_classid(&sk->sk_cgrp_data);
295 #endif
296 
297 		if (nla_put_u32(skb, INET_DIAG_CLASS_ID, classid))
298 			goto errout;
299 	}
300 
301 out:
302 	nlmsg_end(skb, nlh);
303 	return 0;
304 
305 errout:
306 	nlmsg_cancel(skb, nlh);
307 	return -EMSGSIZE;
308 }
309 EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
310 
311 static int inet_csk_diag_fill(struct sock *sk,
312 			      struct sk_buff *skb,
313 			      const struct inet_diag_req_v2 *req,
314 			      struct user_namespace *user_ns,
315 			      u32 portid, u32 seq, u16 nlmsg_flags,
316 			      const struct nlmsghdr *unlh,
317 			      bool net_admin)
318 {
319 	return inet_sk_diag_fill(sk, inet_csk(sk), skb, req, user_ns,
320 				 portid, seq, nlmsg_flags, unlh, net_admin);
321 }
322 
323 static int inet_twsk_diag_fill(struct sock *sk,
324 			       struct sk_buff *skb,
325 			       u32 portid, u32 seq, u16 nlmsg_flags,
326 			       const struct nlmsghdr *unlh)
327 {
328 	struct inet_timewait_sock *tw = inet_twsk(sk);
329 	struct inet_diag_msg *r;
330 	struct nlmsghdr *nlh;
331 	long tmo;
332 
333 	nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
334 			nlmsg_flags);
335 	if (!nlh)
336 		return -EMSGSIZE;
337 
338 	r = nlmsg_data(nlh);
339 	BUG_ON(tw->tw_state != TCP_TIME_WAIT);
340 
341 	tmo = tw->tw_timer.expires - jiffies;
342 	if (tmo < 0)
343 		tmo = 0;
344 
345 	inet_diag_msg_common_fill(r, sk);
346 	r->idiag_retrans      = 0;
347 
348 	r->idiag_state	      = tw->tw_substate;
349 	r->idiag_timer	      = 3;
350 	r->idiag_expires      = jiffies_to_msecs(tmo);
351 	r->idiag_rqueue	      = 0;
352 	r->idiag_wqueue	      = 0;
353 	r->idiag_uid	      = 0;
354 	r->idiag_inode	      = 0;
355 
356 	nlmsg_end(skb, nlh);
357 	return 0;
358 }
359 
360 static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb,
361 			      u32 portid, u32 seq, u16 nlmsg_flags,
362 			      const struct nlmsghdr *unlh, bool net_admin)
363 {
364 	struct request_sock *reqsk = inet_reqsk(sk);
365 	struct inet_diag_msg *r;
366 	struct nlmsghdr *nlh;
367 	long tmo;
368 
369 	nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
370 			nlmsg_flags);
371 	if (!nlh)
372 		return -EMSGSIZE;
373 
374 	r = nlmsg_data(nlh);
375 	inet_diag_msg_common_fill(r, sk);
376 	r->idiag_state = TCP_SYN_RECV;
377 	r->idiag_timer = 1;
378 	r->idiag_retrans = reqsk->num_retrans;
379 
380 	BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) !=
381 		     offsetof(struct sock, sk_cookie));
382 
383 	tmo = inet_reqsk(sk)->rsk_timer.expires - jiffies;
384 	r->idiag_expires = (tmo >= 0) ? jiffies_to_msecs(tmo) : 0;
385 	r->idiag_rqueue	= 0;
386 	r->idiag_wqueue	= 0;
387 	r->idiag_uid	= 0;
388 	r->idiag_inode	= 0;
389 
390 	if (net_admin && nla_put_u32(skb, INET_DIAG_MARK,
391 				     inet_rsk(reqsk)->ir_mark))
392 		return -EMSGSIZE;
393 
394 	nlmsg_end(skb, nlh);
395 	return 0;
396 }
397 
398 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
399 			const struct inet_diag_req_v2 *r,
400 			struct user_namespace *user_ns,
401 			u32 portid, u32 seq, u16 nlmsg_flags,
402 			const struct nlmsghdr *unlh, bool net_admin)
403 {
404 	if (sk->sk_state == TCP_TIME_WAIT)
405 		return inet_twsk_diag_fill(sk, skb, portid, seq,
406 					   nlmsg_flags, unlh);
407 
408 	if (sk->sk_state == TCP_NEW_SYN_RECV)
409 		return inet_req_diag_fill(sk, skb, portid, seq,
410 					  nlmsg_flags, unlh, net_admin);
411 
412 	return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq,
413 				  nlmsg_flags, unlh, net_admin);
414 }
415 
416 struct sock *inet_diag_find_one_icsk(struct net *net,
417 				     struct inet_hashinfo *hashinfo,
418 				     const struct inet_diag_req_v2 *req)
419 {
420 	struct sock *sk;
421 
422 	rcu_read_lock();
423 	if (req->sdiag_family == AF_INET)
424 		sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[0],
425 				 req->id.idiag_dport, req->id.idiag_src[0],
426 				 req->id.idiag_sport, req->id.idiag_if);
427 #if IS_ENABLED(CONFIG_IPV6)
428 	else if (req->sdiag_family == AF_INET6) {
429 		if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) &&
430 		    ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src))
431 			sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[3],
432 					 req->id.idiag_dport, req->id.idiag_src[3],
433 					 req->id.idiag_sport, req->id.idiag_if);
434 		else
435 			sk = inet6_lookup(net, hashinfo, NULL, 0,
436 					  (struct in6_addr *)req->id.idiag_dst,
437 					  req->id.idiag_dport,
438 					  (struct in6_addr *)req->id.idiag_src,
439 					  req->id.idiag_sport,
440 					  req->id.idiag_if);
441 	}
442 #endif
443 	else {
444 		rcu_read_unlock();
445 		return ERR_PTR(-EINVAL);
446 	}
447 	rcu_read_unlock();
448 	if (!sk)
449 		return ERR_PTR(-ENOENT);
450 
451 	if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) {
452 		sock_gen_put(sk);
453 		return ERR_PTR(-ENOENT);
454 	}
455 
456 	return sk;
457 }
458 EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk);
459 
460 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo,
461 			    struct sk_buff *in_skb,
462 			    const struct nlmsghdr *nlh,
463 			    const struct inet_diag_req_v2 *req)
464 {
465 	bool net_admin = netlink_net_capable(in_skb, CAP_NET_ADMIN);
466 	struct net *net = sock_net(in_skb->sk);
467 	struct sk_buff *rep;
468 	struct sock *sk;
469 	int err;
470 
471 	sk = inet_diag_find_one_icsk(net, hashinfo, req);
472 	if (IS_ERR(sk))
473 		return PTR_ERR(sk);
474 
475 	rep = nlmsg_new(inet_sk_attr_size(sk, req, net_admin), GFP_KERNEL);
476 	if (!rep) {
477 		err = -ENOMEM;
478 		goto out;
479 	}
480 
481 	err = sk_diag_fill(sk, rep, req,
482 			   sk_user_ns(NETLINK_CB(in_skb).sk),
483 			   NETLINK_CB(in_skb).portid,
484 			   nlh->nlmsg_seq, 0, nlh, net_admin);
485 	if (err < 0) {
486 		WARN_ON(err == -EMSGSIZE);
487 		nlmsg_free(rep);
488 		goto out;
489 	}
490 	err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
491 			      MSG_DONTWAIT);
492 	if (err > 0)
493 		err = 0;
494 
495 out:
496 	if (sk)
497 		sock_gen_put(sk);
498 
499 	return err;
500 }
501 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
502 
503 static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb,
504 			       const struct nlmsghdr *nlh,
505 			       const struct inet_diag_req_v2 *req)
506 {
507 	const struct inet_diag_handler *handler;
508 	int err;
509 
510 	handler = inet_diag_lock_handler(req->sdiag_protocol);
511 	if (IS_ERR(handler))
512 		err = PTR_ERR(handler);
513 	else if (cmd == SOCK_DIAG_BY_FAMILY)
514 		err = handler->dump_one(in_skb, nlh, req);
515 	else if (cmd == SOCK_DESTROY && handler->destroy)
516 		err = handler->destroy(in_skb, req);
517 	else
518 		err = -EOPNOTSUPP;
519 	inet_diag_unlock_handler(handler);
520 
521 	return err;
522 }
523 
524 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
525 {
526 	int words = bits >> 5;
527 
528 	bits &= 0x1f;
529 
530 	if (words) {
531 		if (memcmp(a1, a2, words << 2))
532 			return 0;
533 	}
534 	if (bits) {
535 		__be32 w1, w2;
536 		__be32 mask;
537 
538 		w1 = a1[words];
539 		w2 = a2[words];
540 
541 		mask = htonl((0xffffffff) << (32 - bits));
542 
543 		if ((w1 ^ w2) & mask)
544 			return 0;
545 	}
546 
547 	return 1;
548 }
549 
550 static int inet_diag_bc_run(const struct nlattr *_bc,
551 			    const struct inet_diag_entry *entry)
552 {
553 	const void *bc = nla_data(_bc);
554 	int len = nla_len(_bc);
555 
556 	while (len > 0) {
557 		int yes = 1;
558 		const struct inet_diag_bc_op *op = bc;
559 
560 		switch (op->code) {
561 		case INET_DIAG_BC_NOP:
562 			break;
563 		case INET_DIAG_BC_JMP:
564 			yes = 0;
565 			break;
566 		case INET_DIAG_BC_S_EQ:
567 			yes = entry->sport == op[1].no;
568 			break;
569 		case INET_DIAG_BC_S_GE:
570 			yes = entry->sport >= op[1].no;
571 			break;
572 		case INET_DIAG_BC_S_LE:
573 			yes = entry->sport <= op[1].no;
574 			break;
575 		case INET_DIAG_BC_D_EQ:
576 			yes = entry->dport == op[1].no;
577 			break;
578 		case INET_DIAG_BC_D_GE:
579 			yes = entry->dport >= op[1].no;
580 			break;
581 		case INET_DIAG_BC_D_LE:
582 			yes = entry->dport <= op[1].no;
583 			break;
584 		case INET_DIAG_BC_AUTO:
585 			yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
586 			break;
587 		case INET_DIAG_BC_S_COND:
588 		case INET_DIAG_BC_D_COND: {
589 			const struct inet_diag_hostcond *cond;
590 			const __be32 *addr;
591 
592 			cond = (const struct inet_diag_hostcond *)(op + 1);
593 			if (cond->port != -1 &&
594 			    cond->port != (op->code == INET_DIAG_BC_S_COND ?
595 					     entry->sport : entry->dport)) {
596 				yes = 0;
597 				break;
598 			}
599 
600 			if (op->code == INET_DIAG_BC_S_COND)
601 				addr = entry->saddr;
602 			else
603 				addr = entry->daddr;
604 
605 			if (cond->family != AF_UNSPEC &&
606 			    cond->family != entry->family) {
607 				if (entry->family == AF_INET6 &&
608 				    cond->family == AF_INET) {
609 					if (addr[0] == 0 && addr[1] == 0 &&
610 					    addr[2] == htonl(0xffff) &&
611 					    bitstring_match(addr + 3,
612 							    cond->addr,
613 							    cond->prefix_len))
614 						break;
615 				}
616 				yes = 0;
617 				break;
618 			}
619 
620 			if (cond->prefix_len == 0)
621 				break;
622 			if (bitstring_match(addr, cond->addr,
623 					    cond->prefix_len))
624 				break;
625 			yes = 0;
626 			break;
627 		}
628 		case INET_DIAG_BC_DEV_COND: {
629 			u32 ifindex;
630 
631 			ifindex = *((const u32 *)(op + 1));
632 			if (ifindex != entry->ifindex)
633 				yes = 0;
634 			break;
635 		}
636 		case INET_DIAG_BC_MARK_COND: {
637 			struct inet_diag_markcond *cond;
638 
639 			cond = (struct inet_diag_markcond *)(op + 1);
640 			if ((entry->mark & cond->mask) != cond->mark)
641 				yes = 0;
642 			break;
643 		}
644 		}
645 
646 		if (yes) {
647 			len -= op->yes;
648 			bc += op->yes;
649 		} else {
650 			len -= op->no;
651 			bc += op->no;
652 		}
653 	}
654 	return len == 0;
655 }
656 
657 /* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV)
658  */
659 static void entry_fill_addrs(struct inet_diag_entry *entry,
660 			     const struct sock *sk)
661 {
662 #if IS_ENABLED(CONFIG_IPV6)
663 	if (sk->sk_family == AF_INET6) {
664 		entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32;
665 		entry->daddr = sk->sk_v6_daddr.s6_addr32;
666 	} else
667 #endif
668 	{
669 		entry->saddr = &sk->sk_rcv_saddr;
670 		entry->daddr = &sk->sk_daddr;
671 	}
672 }
673 
674 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
675 {
676 	struct inet_sock *inet = inet_sk(sk);
677 	struct inet_diag_entry entry;
678 
679 	if (!bc)
680 		return 1;
681 
682 	entry.family = sk->sk_family;
683 	entry_fill_addrs(&entry, sk);
684 	entry.sport = inet->inet_num;
685 	entry.dport = ntohs(inet->inet_dport);
686 	entry.ifindex = sk->sk_bound_dev_if;
687 	entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0;
688 	if (sk_fullsock(sk))
689 		entry.mark = sk->sk_mark;
690 	else if (sk->sk_state == TCP_NEW_SYN_RECV)
691 		entry.mark = inet_rsk(inet_reqsk(sk))->ir_mark;
692 	else
693 		entry.mark = 0;
694 
695 	return inet_diag_bc_run(bc, &entry);
696 }
697 EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
698 
699 static int valid_cc(const void *bc, int len, int cc)
700 {
701 	while (len >= 0) {
702 		const struct inet_diag_bc_op *op = bc;
703 
704 		if (cc > len)
705 			return 0;
706 		if (cc == len)
707 			return 1;
708 		if (op->yes < 4 || op->yes & 3)
709 			return 0;
710 		len -= op->yes;
711 		bc  += op->yes;
712 	}
713 	return 0;
714 }
715 
716 /* data is u32 ifindex */
717 static bool valid_devcond(const struct inet_diag_bc_op *op, int len,
718 			  int *min_len)
719 {
720 	/* Check ifindex space. */
721 	*min_len += sizeof(u32);
722 	if (len < *min_len)
723 		return false;
724 
725 	return true;
726 }
727 /* Validate an inet_diag_hostcond. */
728 static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
729 			   int *min_len)
730 {
731 	struct inet_diag_hostcond *cond;
732 	int addr_len;
733 
734 	/* Check hostcond space. */
735 	*min_len += sizeof(struct inet_diag_hostcond);
736 	if (len < *min_len)
737 		return false;
738 	cond = (struct inet_diag_hostcond *)(op + 1);
739 
740 	/* Check address family and address length. */
741 	switch (cond->family) {
742 	case AF_UNSPEC:
743 		addr_len = 0;
744 		break;
745 	case AF_INET:
746 		addr_len = sizeof(struct in_addr);
747 		break;
748 	case AF_INET6:
749 		addr_len = sizeof(struct in6_addr);
750 		break;
751 	default:
752 		return false;
753 	}
754 	*min_len += addr_len;
755 	if (len < *min_len)
756 		return false;
757 
758 	/* Check prefix length (in bits) vs address length (in bytes). */
759 	if (cond->prefix_len > 8 * addr_len)
760 		return false;
761 
762 	return true;
763 }
764 
765 /* Validate a port comparison operator. */
766 static bool valid_port_comparison(const struct inet_diag_bc_op *op,
767 				  int len, int *min_len)
768 {
769 	/* Port comparisons put the port in a follow-on inet_diag_bc_op. */
770 	*min_len += sizeof(struct inet_diag_bc_op);
771 	if (len < *min_len)
772 		return false;
773 	return true;
774 }
775 
776 static bool valid_markcond(const struct inet_diag_bc_op *op, int len,
777 			   int *min_len)
778 {
779 	*min_len += sizeof(struct inet_diag_markcond);
780 	return len >= *min_len;
781 }
782 
783 static int inet_diag_bc_audit(const struct nlattr *attr,
784 			      const struct sk_buff *skb)
785 {
786 	bool net_admin = netlink_net_capable(skb, CAP_NET_ADMIN);
787 	const void *bytecode, *bc;
788 	int bytecode_len, len;
789 
790 	if (!attr || nla_len(attr) < sizeof(struct inet_diag_bc_op))
791 		return -EINVAL;
792 
793 	bytecode = bc = nla_data(attr);
794 	len = bytecode_len = nla_len(attr);
795 
796 	while (len > 0) {
797 		int min_len = sizeof(struct inet_diag_bc_op);
798 		const struct inet_diag_bc_op *op = bc;
799 
800 		switch (op->code) {
801 		case INET_DIAG_BC_S_COND:
802 		case INET_DIAG_BC_D_COND:
803 			if (!valid_hostcond(bc, len, &min_len))
804 				return -EINVAL;
805 			break;
806 		case INET_DIAG_BC_DEV_COND:
807 			if (!valid_devcond(bc, len, &min_len))
808 				return -EINVAL;
809 			break;
810 		case INET_DIAG_BC_S_EQ:
811 		case INET_DIAG_BC_S_GE:
812 		case INET_DIAG_BC_S_LE:
813 		case INET_DIAG_BC_D_EQ:
814 		case INET_DIAG_BC_D_GE:
815 		case INET_DIAG_BC_D_LE:
816 			if (!valid_port_comparison(bc, len, &min_len))
817 				return -EINVAL;
818 			break;
819 		case INET_DIAG_BC_MARK_COND:
820 			if (!net_admin)
821 				return -EPERM;
822 			if (!valid_markcond(bc, len, &min_len))
823 				return -EINVAL;
824 			break;
825 		case INET_DIAG_BC_AUTO:
826 		case INET_DIAG_BC_JMP:
827 		case INET_DIAG_BC_NOP:
828 			break;
829 		default:
830 			return -EINVAL;
831 		}
832 
833 		if (op->code != INET_DIAG_BC_NOP) {
834 			if (op->no < min_len || op->no > len + 4 || op->no & 3)
835 				return -EINVAL;
836 			if (op->no < len &&
837 			    !valid_cc(bytecode, bytecode_len, len - op->no))
838 				return -EINVAL;
839 		}
840 
841 		if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
842 			return -EINVAL;
843 		bc  += op->yes;
844 		len -= op->yes;
845 	}
846 	return len == 0 ? 0 : -EINVAL;
847 }
848 
849 static int inet_csk_diag_dump(struct sock *sk,
850 			      struct sk_buff *skb,
851 			      struct netlink_callback *cb,
852 			      const struct inet_diag_req_v2 *r,
853 			      const struct nlattr *bc,
854 			      bool net_admin)
855 {
856 	if (!inet_diag_bc_sk(bc, sk))
857 		return 0;
858 
859 	return inet_csk_diag_fill(sk, skb, r,
860 				  sk_user_ns(NETLINK_CB(cb->skb).sk),
861 				  NETLINK_CB(cb->skb).portid,
862 				  cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh,
863 				  net_admin);
864 }
865 
866 static void twsk_build_assert(void)
867 {
868 	BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) !=
869 		     offsetof(struct sock, sk_family));
870 
871 	BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) !=
872 		     offsetof(struct inet_sock, inet_num));
873 
874 	BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) !=
875 		     offsetof(struct inet_sock, inet_dport));
876 
877 	BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) !=
878 		     offsetof(struct inet_sock, inet_rcv_saddr));
879 
880 	BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) !=
881 		     offsetof(struct inet_sock, inet_daddr));
882 
883 #if IS_ENABLED(CONFIG_IPV6)
884 	BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) !=
885 		     offsetof(struct sock, sk_v6_rcv_saddr));
886 
887 	BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) !=
888 		     offsetof(struct sock, sk_v6_daddr));
889 #endif
890 }
891 
892 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
893 			 struct netlink_callback *cb,
894 			 const struct inet_diag_req_v2 *r, struct nlattr *bc)
895 {
896 	bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
897 	struct net *net = sock_net(skb->sk);
898 	u32 idiag_states = r->idiag_states;
899 	int i, num, s_i, s_num;
900 	struct sock *sk;
901 
902 	if (idiag_states & TCPF_SYN_RECV)
903 		idiag_states |= TCPF_NEW_SYN_RECV;
904 	s_i = cb->args[1];
905 	s_num = num = cb->args[2];
906 
907 	if (cb->args[0] == 0) {
908 		if (!(idiag_states & TCPF_LISTEN) || r->id.idiag_dport)
909 			goto skip_listen_ht;
910 
911 		for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
912 			struct inet_listen_hashbucket *ilb;
913 
914 			num = 0;
915 			ilb = &hashinfo->listening_hash[i];
916 			spin_lock(&ilb->lock);
917 			sk_for_each(sk, &ilb->head) {
918 				struct inet_sock *inet = inet_sk(sk);
919 
920 				if (!net_eq(sock_net(sk), net))
921 					continue;
922 
923 				if (num < s_num) {
924 					num++;
925 					continue;
926 				}
927 
928 				if (r->sdiag_family != AF_UNSPEC &&
929 				    sk->sk_family != r->sdiag_family)
930 					goto next_listen;
931 
932 				if (r->id.idiag_sport != inet->inet_sport &&
933 				    r->id.idiag_sport)
934 					goto next_listen;
935 
936 				if (inet_csk_diag_dump(sk, skb, cb, r,
937 						       bc, net_admin) < 0) {
938 					spin_unlock(&ilb->lock);
939 					goto done;
940 				}
941 
942 next_listen:
943 				++num;
944 			}
945 			spin_unlock(&ilb->lock);
946 
947 			s_num = 0;
948 		}
949 skip_listen_ht:
950 		cb->args[0] = 1;
951 		s_i = num = s_num = 0;
952 	}
953 
954 	if (!(idiag_states & ~TCPF_LISTEN))
955 		goto out;
956 
957 #define SKARR_SZ 16
958 	for (i = s_i; i <= hashinfo->ehash_mask; i++) {
959 		struct inet_ehash_bucket *head = &hashinfo->ehash[i];
960 		spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
961 		struct hlist_nulls_node *node;
962 		struct sock *sk_arr[SKARR_SZ];
963 		int num_arr[SKARR_SZ];
964 		int idx, accum, res;
965 
966 		if (hlist_nulls_empty(&head->chain))
967 			continue;
968 
969 		if (i > s_i)
970 			s_num = 0;
971 
972 next_chunk:
973 		num = 0;
974 		accum = 0;
975 		spin_lock_bh(lock);
976 		sk_nulls_for_each(sk, node, &head->chain) {
977 			int state;
978 
979 			if (!net_eq(sock_net(sk), net))
980 				continue;
981 			if (num < s_num)
982 				goto next_normal;
983 			state = (sk->sk_state == TCP_TIME_WAIT) ?
984 				inet_twsk(sk)->tw_substate : sk->sk_state;
985 			if (!(idiag_states & (1 << state)))
986 				goto next_normal;
987 			if (r->sdiag_family != AF_UNSPEC &&
988 			    sk->sk_family != r->sdiag_family)
989 				goto next_normal;
990 			if (r->id.idiag_sport != htons(sk->sk_num) &&
991 			    r->id.idiag_sport)
992 				goto next_normal;
993 			if (r->id.idiag_dport != sk->sk_dport &&
994 			    r->id.idiag_dport)
995 				goto next_normal;
996 			twsk_build_assert();
997 
998 			if (!inet_diag_bc_sk(bc, sk))
999 				goto next_normal;
1000 
1001 			if (!refcount_inc_not_zero(&sk->sk_refcnt))
1002 				goto next_normal;
1003 
1004 			num_arr[accum] = num;
1005 			sk_arr[accum] = sk;
1006 			if (++accum == SKARR_SZ)
1007 				break;
1008 next_normal:
1009 			++num;
1010 		}
1011 		spin_unlock_bh(lock);
1012 		res = 0;
1013 		for (idx = 0; idx < accum; idx++) {
1014 			if (res >= 0) {
1015 				res = sk_diag_fill(sk_arr[idx], skb, r,
1016 					   sk_user_ns(NETLINK_CB(cb->skb).sk),
1017 					   NETLINK_CB(cb->skb).portid,
1018 					   cb->nlh->nlmsg_seq, NLM_F_MULTI,
1019 					   cb->nlh, net_admin);
1020 				if (res < 0)
1021 					num = num_arr[idx];
1022 			}
1023 			sock_gen_put(sk_arr[idx]);
1024 		}
1025 		if (res < 0)
1026 			break;
1027 		cond_resched();
1028 		if (accum == SKARR_SZ) {
1029 			s_num = num + 1;
1030 			goto next_chunk;
1031 		}
1032 	}
1033 
1034 done:
1035 	cb->args[1] = i;
1036 	cb->args[2] = num;
1037 out:
1038 	;
1039 }
1040 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
1041 
1042 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
1043 			    const struct inet_diag_req_v2 *r,
1044 			    struct nlattr *bc)
1045 {
1046 	const struct inet_diag_handler *handler;
1047 	int err = 0;
1048 
1049 	handler = inet_diag_lock_handler(r->sdiag_protocol);
1050 	if (!IS_ERR(handler))
1051 		handler->dump(skb, cb, r, bc);
1052 	else
1053 		err = PTR_ERR(handler);
1054 	inet_diag_unlock_handler(handler);
1055 
1056 	return err ? : skb->len;
1057 }
1058 
1059 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
1060 {
1061 	int hdrlen = sizeof(struct inet_diag_req_v2);
1062 	struct nlattr *bc = NULL;
1063 
1064 	if (nlmsg_attrlen(cb->nlh, hdrlen))
1065 		bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1066 
1067 	return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
1068 }
1069 
1070 static int inet_diag_type2proto(int type)
1071 {
1072 	switch (type) {
1073 	case TCPDIAG_GETSOCK:
1074 		return IPPROTO_TCP;
1075 	case DCCPDIAG_GETSOCK:
1076 		return IPPROTO_DCCP;
1077 	default:
1078 		return 0;
1079 	}
1080 }
1081 
1082 static int inet_diag_dump_compat(struct sk_buff *skb,
1083 				 struct netlink_callback *cb)
1084 {
1085 	struct inet_diag_req *rc = nlmsg_data(cb->nlh);
1086 	int hdrlen = sizeof(struct inet_diag_req);
1087 	struct inet_diag_req_v2 req;
1088 	struct nlattr *bc = NULL;
1089 
1090 	req.sdiag_family = AF_UNSPEC; /* compatibility */
1091 	req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
1092 	req.idiag_ext = rc->idiag_ext;
1093 	req.idiag_states = rc->idiag_states;
1094 	req.id = rc->id;
1095 
1096 	if (nlmsg_attrlen(cb->nlh, hdrlen))
1097 		bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1098 
1099 	return __inet_diag_dump(skb, cb, &req, bc);
1100 }
1101 
1102 static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
1103 				      const struct nlmsghdr *nlh)
1104 {
1105 	struct inet_diag_req *rc = nlmsg_data(nlh);
1106 	struct inet_diag_req_v2 req;
1107 
1108 	req.sdiag_family = rc->idiag_family;
1109 	req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
1110 	req.idiag_ext = rc->idiag_ext;
1111 	req.idiag_states = rc->idiag_states;
1112 	req.id = rc->id;
1113 
1114 	return inet_diag_cmd_exact(SOCK_DIAG_BY_FAMILY, in_skb, nlh, &req);
1115 }
1116 
1117 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
1118 {
1119 	int hdrlen = sizeof(struct inet_diag_req);
1120 	struct net *net = sock_net(skb->sk);
1121 
1122 	if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
1123 	    nlmsg_len(nlh) < hdrlen)
1124 		return -EINVAL;
1125 
1126 	if (nlh->nlmsg_flags & NLM_F_DUMP) {
1127 		if (nlmsg_attrlen(nlh, hdrlen)) {
1128 			struct nlattr *attr;
1129 			int err;
1130 
1131 			attr = nlmsg_find_attr(nlh, hdrlen,
1132 					       INET_DIAG_REQ_BYTECODE);
1133 			err = inet_diag_bc_audit(attr, skb);
1134 			if (err)
1135 				return err;
1136 		}
1137 		{
1138 			struct netlink_dump_control c = {
1139 				.dump = inet_diag_dump_compat,
1140 			};
1141 			return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
1142 		}
1143 	}
1144 
1145 	return inet_diag_get_exact_compat(skb, nlh);
1146 }
1147 
1148 static int inet_diag_handler_cmd(struct sk_buff *skb, struct nlmsghdr *h)
1149 {
1150 	int hdrlen = sizeof(struct inet_diag_req_v2);
1151 	struct net *net = sock_net(skb->sk);
1152 
1153 	if (nlmsg_len(h) < hdrlen)
1154 		return -EINVAL;
1155 
1156 	if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
1157 	    h->nlmsg_flags & NLM_F_DUMP) {
1158 		if (nlmsg_attrlen(h, hdrlen)) {
1159 			struct nlattr *attr;
1160 			int err;
1161 
1162 			attr = nlmsg_find_attr(h, hdrlen,
1163 					       INET_DIAG_REQ_BYTECODE);
1164 			err = inet_diag_bc_audit(attr, skb);
1165 			if (err)
1166 				return err;
1167 		}
1168 		{
1169 			struct netlink_dump_control c = {
1170 				.dump = inet_diag_dump,
1171 			};
1172 			return netlink_dump_start(net->diag_nlsk, skb, h, &c);
1173 		}
1174 	}
1175 
1176 	return inet_diag_cmd_exact(h->nlmsg_type, skb, h, nlmsg_data(h));
1177 }
1178 
1179 static
1180 int inet_diag_handler_get_info(struct sk_buff *skb, struct sock *sk)
1181 {
1182 	const struct inet_diag_handler *handler;
1183 	struct nlmsghdr *nlh;
1184 	struct nlattr *attr;
1185 	struct inet_diag_msg *r;
1186 	void *info = NULL;
1187 	int err = 0;
1188 
1189 	nlh = nlmsg_put(skb, 0, 0, SOCK_DIAG_BY_FAMILY, sizeof(*r), 0);
1190 	if (!nlh)
1191 		return -ENOMEM;
1192 
1193 	r = nlmsg_data(nlh);
1194 	memset(r, 0, sizeof(*r));
1195 	inet_diag_msg_common_fill(r, sk);
1196 	if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_STREAM)
1197 		r->id.idiag_sport = inet_sk(sk)->inet_sport;
1198 	r->idiag_state = sk->sk_state;
1199 
1200 	if ((err = nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))) {
1201 		nlmsg_cancel(skb, nlh);
1202 		return err;
1203 	}
1204 
1205 	handler = inet_diag_lock_handler(sk->sk_protocol);
1206 	if (IS_ERR(handler)) {
1207 		inet_diag_unlock_handler(handler);
1208 		nlmsg_cancel(skb, nlh);
1209 		return PTR_ERR(handler);
1210 	}
1211 
1212 	attr = handler->idiag_info_size
1213 		? nla_reserve_64bit(skb, INET_DIAG_INFO,
1214 				    handler->idiag_info_size,
1215 				    INET_DIAG_PAD)
1216 		: NULL;
1217 	if (attr)
1218 		info = nla_data(attr);
1219 
1220 	handler->idiag_get_info(sk, r, info);
1221 	inet_diag_unlock_handler(handler);
1222 
1223 	nlmsg_end(skb, nlh);
1224 	return 0;
1225 }
1226 
1227 static const struct sock_diag_handler inet_diag_handler = {
1228 	.family = AF_INET,
1229 	.dump = inet_diag_handler_cmd,
1230 	.get_info = inet_diag_handler_get_info,
1231 	.destroy = inet_diag_handler_cmd,
1232 };
1233 
1234 static const struct sock_diag_handler inet6_diag_handler = {
1235 	.family = AF_INET6,
1236 	.dump = inet_diag_handler_cmd,
1237 	.get_info = inet_diag_handler_get_info,
1238 	.destroy = inet_diag_handler_cmd,
1239 };
1240 
1241 int inet_diag_register(const struct inet_diag_handler *h)
1242 {
1243 	const __u16 type = h->idiag_type;
1244 	int err = -EINVAL;
1245 
1246 	if (type >= IPPROTO_MAX)
1247 		goto out;
1248 
1249 	mutex_lock(&inet_diag_table_mutex);
1250 	err = -EEXIST;
1251 	if (!inet_diag_table[type]) {
1252 		inet_diag_table[type] = h;
1253 		err = 0;
1254 	}
1255 	mutex_unlock(&inet_diag_table_mutex);
1256 out:
1257 	return err;
1258 }
1259 EXPORT_SYMBOL_GPL(inet_diag_register);
1260 
1261 void inet_diag_unregister(const struct inet_diag_handler *h)
1262 {
1263 	const __u16 type = h->idiag_type;
1264 
1265 	if (type >= IPPROTO_MAX)
1266 		return;
1267 
1268 	mutex_lock(&inet_diag_table_mutex);
1269 	inet_diag_table[type] = NULL;
1270 	mutex_unlock(&inet_diag_table_mutex);
1271 }
1272 EXPORT_SYMBOL_GPL(inet_diag_unregister);
1273 
1274 static int __init inet_diag_init(void)
1275 {
1276 	const int inet_diag_table_size = (IPPROTO_MAX *
1277 					  sizeof(struct inet_diag_handler *));
1278 	int err = -ENOMEM;
1279 
1280 	inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1281 	if (!inet_diag_table)
1282 		goto out;
1283 
1284 	err = sock_diag_register(&inet_diag_handler);
1285 	if (err)
1286 		goto out_free_nl;
1287 
1288 	err = sock_diag_register(&inet6_diag_handler);
1289 	if (err)
1290 		goto out_free_inet;
1291 
1292 	sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1293 out:
1294 	return err;
1295 
1296 out_free_inet:
1297 	sock_diag_unregister(&inet_diag_handler);
1298 out_free_nl:
1299 	kfree(inet_diag_table);
1300 	goto out;
1301 }
1302 
1303 static void __exit inet_diag_exit(void)
1304 {
1305 	sock_diag_unregister(&inet6_diag_handler);
1306 	sock_diag_unregister(&inet_diag_handler);
1307 	sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1308 	kfree(inet_diag_table);
1309 }
1310 
1311 module_init(inet_diag_init);
1312 module_exit(inet_diag_exit);
1313 MODULE_LICENSE("GPL");
1314 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1315 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);
1316