xref: /openbmc/linux/net/ipv4/inet_diag.c (revision d198b34f3855eee2571dda03eea75a09c7c31480)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * inet_diag.c	Module for monitoring INET transport protocols sockets.
4  *
5  * Authors:	Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
6  */
7 
8 #include <linux/kernel.h>
9 #include <linux/module.h>
10 #include <linux/types.h>
11 #include <linux/fcntl.h>
12 #include <linux/random.h>
13 #include <linux/slab.h>
14 #include <linux/cache.h>
15 #include <linux/init.h>
16 #include <linux/time.h>
17 
18 #include <net/icmp.h>
19 #include <net/tcp.h>
20 #include <net/ipv6.h>
21 #include <net/inet_common.h>
22 #include <net/inet_connection_sock.h>
23 #include <net/inet_hashtables.h>
24 #include <net/inet_timewait_sock.h>
25 #include <net/inet6_hashtables.h>
26 #include <net/netlink.h>
27 
28 #include <linux/inet.h>
29 #include <linux/stddef.h>
30 
31 #include <linux/inet_diag.h>
32 #include <linux/sock_diag.h>
33 
34 static const struct inet_diag_handler **inet_diag_table;
35 
36 struct inet_diag_entry {
37 	const __be32 *saddr;
38 	const __be32 *daddr;
39 	u16 sport;
40 	u16 dport;
41 	u16 family;
42 	u16 userlocks;
43 	u32 ifindex;
44 	u32 mark;
45 };
46 
47 static DEFINE_MUTEX(inet_diag_table_mutex);
48 
49 static const struct inet_diag_handler *inet_diag_lock_handler(int proto)
50 {
51 	if (!inet_diag_table[proto])
52 		sock_load_diag_module(AF_INET, proto);
53 
54 	mutex_lock(&inet_diag_table_mutex);
55 	if (!inet_diag_table[proto])
56 		return ERR_PTR(-ENOENT);
57 
58 	return inet_diag_table[proto];
59 }
60 
61 static void inet_diag_unlock_handler(const struct inet_diag_handler *handler)
62 {
63 	mutex_unlock(&inet_diag_table_mutex);
64 }
65 
66 void inet_diag_msg_common_fill(struct inet_diag_msg *r, struct sock *sk)
67 {
68 	r->idiag_family = sk->sk_family;
69 
70 	r->id.idiag_sport = htons(sk->sk_num);
71 	r->id.idiag_dport = sk->sk_dport;
72 	r->id.idiag_if = sk->sk_bound_dev_if;
73 	sock_diag_save_cookie(sk, r->id.idiag_cookie);
74 
75 #if IS_ENABLED(CONFIG_IPV6)
76 	if (sk->sk_family == AF_INET6) {
77 		*(struct in6_addr *)r->id.idiag_src = sk->sk_v6_rcv_saddr;
78 		*(struct in6_addr *)r->id.idiag_dst = sk->sk_v6_daddr;
79 	} else
80 #endif
81 	{
82 	memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
83 	memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
84 
85 	r->id.idiag_src[0] = sk->sk_rcv_saddr;
86 	r->id.idiag_dst[0] = sk->sk_daddr;
87 	}
88 }
89 EXPORT_SYMBOL_GPL(inet_diag_msg_common_fill);
90 
91 static size_t inet_sk_attr_size(struct sock *sk,
92 				const struct inet_diag_req_v2 *req,
93 				bool net_admin)
94 {
95 	const struct inet_diag_handler *handler;
96 	size_t aux = 0;
97 
98 	handler = inet_diag_table[req->sdiag_protocol];
99 	if (handler && handler->idiag_get_aux_size)
100 		aux = handler->idiag_get_aux_size(sk, net_admin);
101 
102 	return	  nla_total_size(sizeof(struct tcp_info))
103 		+ nla_total_size(sizeof(struct inet_diag_msg))
104 		+ inet_diag_msg_attrs_size()
105 		+ nla_total_size(sizeof(struct inet_diag_meminfo))
106 		+ nla_total_size(SK_MEMINFO_VARS * sizeof(u32))
107 		+ nla_total_size(TCP_CA_NAME_MAX)
108 		+ nla_total_size(sizeof(struct tcpvegas_info))
109 		+ aux
110 		+ 64;
111 }
112 
113 int inet_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb,
114 			     struct inet_diag_msg *r, int ext,
115 			     struct user_namespace *user_ns,
116 			     bool net_admin)
117 {
118 	const struct inet_sock *inet = inet_sk(sk);
119 
120 	if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown))
121 		goto errout;
122 
123 	/* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
124 	 * hence this needs to be included regardless of socket family.
125 	 */
126 	if (ext & (1 << (INET_DIAG_TOS - 1)))
127 		if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0)
128 			goto errout;
129 
130 #if IS_ENABLED(CONFIG_IPV6)
131 	if (r->idiag_family == AF_INET6) {
132 		if (ext & (1 << (INET_DIAG_TCLASS - 1)))
133 			if (nla_put_u8(skb, INET_DIAG_TCLASS,
134 				       inet6_sk(sk)->tclass) < 0)
135 				goto errout;
136 
137 		if (((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
138 		    nla_put_u8(skb, INET_DIAG_SKV6ONLY, ipv6_only_sock(sk)))
139 			goto errout;
140 	}
141 #endif
142 
143 	if (net_admin && nla_put_u32(skb, INET_DIAG_MARK, sk->sk_mark))
144 		goto errout;
145 
146 	if (ext & (1 << (INET_DIAG_CLASS_ID - 1)) ||
147 	    ext & (1 << (INET_DIAG_TCLASS - 1))) {
148 		u32 classid = 0;
149 
150 #ifdef CONFIG_SOCK_CGROUP_DATA
151 		classid = sock_cgroup_classid(&sk->sk_cgrp_data);
152 #endif
153 		/* Fallback to socket priority if class id isn't set.
154 		 * Classful qdiscs use it as direct reference to class.
155 		 * For cgroup2 classid is always zero.
156 		 */
157 		if (!classid)
158 			classid = sk->sk_priority;
159 
160 		if (nla_put_u32(skb, INET_DIAG_CLASS_ID, classid))
161 			goto errout;
162 	}
163 
164 	r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
165 	r->idiag_inode = sock_i_ino(sk);
166 
167 	return 0;
168 errout:
169 	return 1;
170 }
171 EXPORT_SYMBOL_GPL(inet_diag_msg_attrs_fill);
172 
173 int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
174 		      struct sk_buff *skb, const struct inet_diag_req_v2 *req,
175 		      struct user_namespace *user_ns,
176 		      u32 portid, u32 seq, u16 nlmsg_flags,
177 		      const struct nlmsghdr *unlh,
178 		      bool net_admin)
179 {
180 	const struct tcp_congestion_ops *ca_ops;
181 	const struct inet_diag_handler *handler;
182 	int ext = req->idiag_ext;
183 	struct inet_diag_msg *r;
184 	struct nlmsghdr  *nlh;
185 	struct nlattr *attr;
186 	void *info = NULL;
187 
188 	handler = inet_diag_table[req->sdiag_protocol];
189 	BUG_ON(!handler);
190 
191 	nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
192 			nlmsg_flags);
193 	if (!nlh)
194 		return -EMSGSIZE;
195 
196 	r = nlmsg_data(nlh);
197 	BUG_ON(!sk_fullsock(sk));
198 
199 	inet_diag_msg_common_fill(r, sk);
200 	r->idiag_state = sk->sk_state;
201 	r->idiag_timer = 0;
202 	r->idiag_retrans = 0;
203 
204 	if (inet_diag_msg_attrs_fill(sk, skb, r, ext, user_ns, net_admin))
205 		goto errout;
206 
207 	if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
208 		struct inet_diag_meminfo minfo = {
209 			.idiag_rmem = sk_rmem_alloc_get(sk),
210 			.idiag_wmem = READ_ONCE(sk->sk_wmem_queued),
211 			.idiag_fmem = sk->sk_forward_alloc,
212 			.idiag_tmem = sk_wmem_alloc_get(sk),
213 		};
214 
215 		if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
216 			goto errout;
217 	}
218 
219 	if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
220 		if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
221 			goto errout;
222 
223 	/*
224 	 * RAW sockets might have user-defined protocols assigned,
225 	 * so report the one supplied on socket creation.
226 	 */
227 	if (sk->sk_type == SOCK_RAW) {
228 		if (nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))
229 			goto errout;
230 	}
231 
232 	if (!icsk) {
233 		handler->idiag_get_info(sk, r, NULL);
234 		goto out;
235 	}
236 
237 	if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
238 	    icsk->icsk_pending == ICSK_TIME_REO_TIMEOUT ||
239 	    icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
240 		r->idiag_timer = 1;
241 		r->idiag_retrans = icsk->icsk_retransmits;
242 		r->idiag_expires =
243 			jiffies_delta_to_msecs(icsk->icsk_timeout - jiffies);
244 	} else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
245 		r->idiag_timer = 4;
246 		r->idiag_retrans = icsk->icsk_probes_out;
247 		r->idiag_expires =
248 			jiffies_delta_to_msecs(icsk->icsk_timeout - jiffies);
249 	} else if (timer_pending(&sk->sk_timer)) {
250 		r->idiag_timer = 2;
251 		r->idiag_retrans = icsk->icsk_probes_out;
252 		r->idiag_expires =
253 			jiffies_delta_to_msecs(sk->sk_timer.expires - jiffies);
254 	} else {
255 		r->idiag_timer = 0;
256 		r->idiag_expires = 0;
257 	}
258 
259 	if ((ext & (1 << (INET_DIAG_INFO - 1))) && handler->idiag_info_size) {
260 		attr = nla_reserve_64bit(skb, INET_DIAG_INFO,
261 					 handler->idiag_info_size,
262 					 INET_DIAG_PAD);
263 		if (!attr)
264 			goto errout;
265 
266 		info = nla_data(attr);
267 	}
268 
269 	if (ext & (1 << (INET_DIAG_CONG - 1))) {
270 		int err = 0;
271 
272 		rcu_read_lock();
273 		ca_ops = READ_ONCE(icsk->icsk_ca_ops);
274 		if (ca_ops)
275 			err = nla_put_string(skb, INET_DIAG_CONG, ca_ops->name);
276 		rcu_read_unlock();
277 		if (err < 0)
278 			goto errout;
279 	}
280 
281 	handler->idiag_get_info(sk, r, info);
282 
283 	if (ext & (1 << (INET_DIAG_INFO - 1)) && handler->idiag_get_aux)
284 		if (handler->idiag_get_aux(sk, net_admin, skb) < 0)
285 			goto errout;
286 
287 	if (sk->sk_state < TCP_TIME_WAIT) {
288 		union tcp_cc_info info;
289 		size_t sz = 0;
290 		int attr;
291 
292 		rcu_read_lock();
293 		ca_ops = READ_ONCE(icsk->icsk_ca_ops);
294 		if (ca_ops && ca_ops->get_info)
295 			sz = ca_ops->get_info(sk, ext, &attr, &info);
296 		rcu_read_unlock();
297 		if (sz && nla_put(skb, attr, sz, &info) < 0)
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 	inet_diag_msg_common_fill(r, sk);
342 	r->idiag_retrans      = 0;
343 
344 	r->idiag_state	      = tw->tw_substate;
345 	r->idiag_timer	      = 3;
346 	tmo = tw->tw_timer.expires - jiffies;
347 	r->idiag_expires      = jiffies_delta_to_msecs(tmo);
348 	r->idiag_rqueue	      = 0;
349 	r->idiag_wqueue	      = 0;
350 	r->idiag_uid	      = 0;
351 	r->idiag_inode	      = 0;
352 
353 	nlmsg_end(skb, nlh);
354 	return 0;
355 }
356 
357 static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb,
358 			      u32 portid, u32 seq, u16 nlmsg_flags,
359 			      const struct nlmsghdr *unlh, bool net_admin)
360 {
361 	struct request_sock *reqsk = inet_reqsk(sk);
362 	struct inet_diag_msg *r;
363 	struct nlmsghdr *nlh;
364 	long tmo;
365 
366 	nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
367 			nlmsg_flags);
368 	if (!nlh)
369 		return -EMSGSIZE;
370 
371 	r = nlmsg_data(nlh);
372 	inet_diag_msg_common_fill(r, sk);
373 	r->idiag_state = TCP_SYN_RECV;
374 	r->idiag_timer = 1;
375 	r->idiag_retrans = reqsk->num_retrans;
376 
377 	BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) !=
378 		     offsetof(struct sock, sk_cookie));
379 
380 	tmo = inet_reqsk(sk)->rsk_timer.expires - jiffies;
381 	r->idiag_expires = jiffies_delta_to_msecs(tmo);
382 	r->idiag_rqueue	= 0;
383 	r->idiag_wqueue	= 0;
384 	r->idiag_uid	= 0;
385 	r->idiag_inode	= 0;
386 
387 	if (net_admin && nla_put_u32(skb, INET_DIAG_MARK,
388 				     inet_rsk(reqsk)->ir_mark))
389 		return -EMSGSIZE;
390 
391 	nlmsg_end(skb, nlh);
392 	return 0;
393 }
394 
395 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
396 			const struct inet_diag_req_v2 *r,
397 			struct user_namespace *user_ns,
398 			u32 portid, u32 seq, u16 nlmsg_flags,
399 			const struct nlmsghdr *unlh, bool net_admin)
400 {
401 	if (sk->sk_state == TCP_TIME_WAIT)
402 		return inet_twsk_diag_fill(sk, skb, portid, seq,
403 					   nlmsg_flags, unlh);
404 
405 	if (sk->sk_state == TCP_NEW_SYN_RECV)
406 		return inet_req_diag_fill(sk, skb, portid, seq,
407 					  nlmsg_flags, unlh, net_admin);
408 
409 	return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq,
410 				  nlmsg_flags, unlh, net_admin);
411 }
412 
413 struct sock *inet_diag_find_one_icsk(struct net *net,
414 				     struct inet_hashinfo *hashinfo,
415 				     const struct inet_diag_req_v2 *req)
416 {
417 	struct sock *sk;
418 
419 	rcu_read_lock();
420 	if (req->sdiag_family == AF_INET)
421 		sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[0],
422 				 req->id.idiag_dport, req->id.idiag_src[0],
423 				 req->id.idiag_sport, req->id.idiag_if);
424 #if IS_ENABLED(CONFIG_IPV6)
425 	else if (req->sdiag_family == AF_INET6) {
426 		if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) &&
427 		    ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src))
428 			sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[3],
429 					 req->id.idiag_dport, req->id.idiag_src[3],
430 					 req->id.idiag_sport, req->id.idiag_if);
431 		else
432 			sk = inet6_lookup(net, hashinfo, NULL, 0,
433 					  (struct in6_addr *)req->id.idiag_dst,
434 					  req->id.idiag_dport,
435 					  (struct in6_addr *)req->id.idiag_src,
436 					  req->id.idiag_sport,
437 					  req->id.idiag_if);
438 	}
439 #endif
440 	else {
441 		rcu_read_unlock();
442 		return ERR_PTR(-EINVAL);
443 	}
444 	rcu_read_unlock();
445 	if (!sk)
446 		return ERR_PTR(-ENOENT);
447 
448 	if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) {
449 		sock_gen_put(sk);
450 		return ERR_PTR(-ENOENT);
451 	}
452 
453 	return sk;
454 }
455 EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk);
456 
457 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo,
458 			    struct sk_buff *in_skb,
459 			    const struct nlmsghdr *nlh,
460 			    const struct inet_diag_req_v2 *req)
461 {
462 	bool net_admin = netlink_net_capable(in_skb, CAP_NET_ADMIN);
463 	struct net *net = sock_net(in_skb->sk);
464 	struct sk_buff *rep;
465 	struct sock *sk;
466 	int err;
467 
468 	sk = inet_diag_find_one_icsk(net, hashinfo, req);
469 	if (IS_ERR(sk))
470 		return PTR_ERR(sk);
471 
472 	rep = nlmsg_new(inet_sk_attr_size(sk, req, net_admin), GFP_KERNEL);
473 	if (!rep) {
474 		err = -ENOMEM;
475 		goto out;
476 	}
477 
478 	err = sk_diag_fill(sk, rep, req,
479 			   sk_user_ns(NETLINK_CB(in_skb).sk),
480 			   NETLINK_CB(in_skb).portid,
481 			   nlh->nlmsg_seq, 0, nlh, net_admin);
482 	if (err < 0) {
483 		WARN_ON(err == -EMSGSIZE);
484 		nlmsg_free(rep);
485 		goto out;
486 	}
487 	err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
488 			      MSG_DONTWAIT);
489 	if (err > 0)
490 		err = 0;
491 
492 out:
493 	if (sk)
494 		sock_gen_put(sk);
495 
496 	return err;
497 }
498 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
499 
500 static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb,
501 			       const struct nlmsghdr *nlh,
502 			       const struct inet_diag_req_v2 *req)
503 {
504 	const struct inet_diag_handler *handler;
505 	int err;
506 
507 	handler = inet_diag_lock_handler(req->sdiag_protocol);
508 	if (IS_ERR(handler))
509 		err = PTR_ERR(handler);
510 	else if (cmd == SOCK_DIAG_BY_FAMILY)
511 		err = handler->dump_one(in_skb, nlh, req);
512 	else if (cmd == SOCK_DESTROY && handler->destroy)
513 		err = handler->destroy(in_skb, req);
514 	else
515 		err = -EOPNOTSUPP;
516 	inet_diag_unlock_handler(handler);
517 
518 	return err;
519 }
520 
521 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
522 {
523 	int words = bits >> 5;
524 
525 	bits &= 0x1f;
526 
527 	if (words) {
528 		if (memcmp(a1, a2, words << 2))
529 			return 0;
530 	}
531 	if (bits) {
532 		__be32 w1, w2;
533 		__be32 mask;
534 
535 		w1 = a1[words];
536 		w2 = a2[words];
537 
538 		mask = htonl((0xffffffff) << (32 - bits));
539 
540 		if ((w1 ^ w2) & mask)
541 			return 0;
542 	}
543 
544 	return 1;
545 }
546 
547 static int inet_diag_bc_run(const struct nlattr *_bc,
548 			    const struct inet_diag_entry *entry)
549 {
550 	const void *bc = nla_data(_bc);
551 	int len = nla_len(_bc);
552 
553 	while (len > 0) {
554 		int yes = 1;
555 		const struct inet_diag_bc_op *op = bc;
556 
557 		switch (op->code) {
558 		case INET_DIAG_BC_NOP:
559 			break;
560 		case INET_DIAG_BC_JMP:
561 			yes = 0;
562 			break;
563 		case INET_DIAG_BC_S_EQ:
564 			yes = entry->sport == op[1].no;
565 			break;
566 		case INET_DIAG_BC_S_GE:
567 			yes = entry->sport >= op[1].no;
568 			break;
569 		case INET_DIAG_BC_S_LE:
570 			yes = entry->sport <= op[1].no;
571 			break;
572 		case INET_DIAG_BC_D_EQ:
573 			yes = entry->dport == op[1].no;
574 			break;
575 		case INET_DIAG_BC_D_GE:
576 			yes = entry->dport >= op[1].no;
577 			break;
578 		case INET_DIAG_BC_D_LE:
579 			yes = entry->dport <= op[1].no;
580 			break;
581 		case INET_DIAG_BC_AUTO:
582 			yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
583 			break;
584 		case INET_DIAG_BC_S_COND:
585 		case INET_DIAG_BC_D_COND: {
586 			const struct inet_diag_hostcond *cond;
587 			const __be32 *addr;
588 
589 			cond = (const struct inet_diag_hostcond *)(op + 1);
590 			if (cond->port != -1 &&
591 			    cond->port != (op->code == INET_DIAG_BC_S_COND ?
592 					     entry->sport : entry->dport)) {
593 				yes = 0;
594 				break;
595 			}
596 
597 			if (op->code == INET_DIAG_BC_S_COND)
598 				addr = entry->saddr;
599 			else
600 				addr = entry->daddr;
601 
602 			if (cond->family != AF_UNSPEC &&
603 			    cond->family != entry->family) {
604 				if (entry->family == AF_INET6 &&
605 				    cond->family == AF_INET) {
606 					if (addr[0] == 0 && addr[1] == 0 &&
607 					    addr[2] == htonl(0xffff) &&
608 					    bitstring_match(addr + 3,
609 							    cond->addr,
610 							    cond->prefix_len))
611 						break;
612 				}
613 				yes = 0;
614 				break;
615 			}
616 
617 			if (cond->prefix_len == 0)
618 				break;
619 			if (bitstring_match(addr, cond->addr,
620 					    cond->prefix_len))
621 				break;
622 			yes = 0;
623 			break;
624 		}
625 		case INET_DIAG_BC_DEV_COND: {
626 			u32 ifindex;
627 
628 			ifindex = *((const u32 *)(op + 1));
629 			if (ifindex != entry->ifindex)
630 				yes = 0;
631 			break;
632 		}
633 		case INET_DIAG_BC_MARK_COND: {
634 			struct inet_diag_markcond *cond;
635 
636 			cond = (struct inet_diag_markcond *)(op + 1);
637 			if ((entry->mark & cond->mask) != cond->mark)
638 				yes = 0;
639 			break;
640 		}
641 		}
642 
643 		if (yes) {
644 			len -= op->yes;
645 			bc += op->yes;
646 		} else {
647 			len -= op->no;
648 			bc += op->no;
649 		}
650 	}
651 	return len == 0;
652 }
653 
654 /* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV)
655  */
656 static void entry_fill_addrs(struct inet_diag_entry *entry,
657 			     const struct sock *sk)
658 {
659 #if IS_ENABLED(CONFIG_IPV6)
660 	if (sk->sk_family == AF_INET6) {
661 		entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32;
662 		entry->daddr = sk->sk_v6_daddr.s6_addr32;
663 	} else
664 #endif
665 	{
666 		entry->saddr = &sk->sk_rcv_saddr;
667 		entry->daddr = &sk->sk_daddr;
668 	}
669 }
670 
671 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
672 {
673 	struct inet_sock *inet = inet_sk(sk);
674 	struct inet_diag_entry entry;
675 
676 	if (!bc)
677 		return 1;
678 
679 	entry.family = sk->sk_family;
680 	entry_fill_addrs(&entry, sk);
681 	entry.sport = inet->inet_num;
682 	entry.dport = ntohs(inet->inet_dport);
683 	entry.ifindex = sk->sk_bound_dev_if;
684 	entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0;
685 	if (sk_fullsock(sk))
686 		entry.mark = sk->sk_mark;
687 	else if (sk->sk_state == TCP_NEW_SYN_RECV)
688 		entry.mark = inet_rsk(inet_reqsk(sk))->ir_mark;
689 	else
690 		entry.mark = 0;
691 
692 	return inet_diag_bc_run(bc, &entry);
693 }
694 EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
695 
696 static int valid_cc(const void *bc, int len, int cc)
697 {
698 	while (len >= 0) {
699 		const struct inet_diag_bc_op *op = bc;
700 
701 		if (cc > len)
702 			return 0;
703 		if (cc == len)
704 			return 1;
705 		if (op->yes < 4 || op->yes & 3)
706 			return 0;
707 		len -= op->yes;
708 		bc  += op->yes;
709 	}
710 	return 0;
711 }
712 
713 /* data is u32 ifindex */
714 static bool valid_devcond(const struct inet_diag_bc_op *op, int len,
715 			  int *min_len)
716 {
717 	/* Check ifindex space. */
718 	*min_len += sizeof(u32);
719 	if (len < *min_len)
720 		return false;
721 
722 	return true;
723 }
724 /* Validate an inet_diag_hostcond. */
725 static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
726 			   int *min_len)
727 {
728 	struct inet_diag_hostcond *cond;
729 	int addr_len;
730 
731 	/* Check hostcond space. */
732 	*min_len += sizeof(struct inet_diag_hostcond);
733 	if (len < *min_len)
734 		return false;
735 	cond = (struct inet_diag_hostcond *)(op + 1);
736 
737 	/* Check address family and address length. */
738 	switch (cond->family) {
739 	case AF_UNSPEC:
740 		addr_len = 0;
741 		break;
742 	case AF_INET:
743 		addr_len = sizeof(struct in_addr);
744 		break;
745 	case AF_INET6:
746 		addr_len = sizeof(struct in6_addr);
747 		break;
748 	default:
749 		return false;
750 	}
751 	*min_len += addr_len;
752 	if (len < *min_len)
753 		return false;
754 
755 	/* Check prefix length (in bits) vs address length (in bytes). */
756 	if (cond->prefix_len > 8 * addr_len)
757 		return false;
758 
759 	return true;
760 }
761 
762 /* Validate a port comparison operator. */
763 static bool valid_port_comparison(const struct inet_diag_bc_op *op,
764 				  int len, int *min_len)
765 {
766 	/* Port comparisons put the port in a follow-on inet_diag_bc_op. */
767 	*min_len += sizeof(struct inet_diag_bc_op);
768 	if (len < *min_len)
769 		return false;
770 	return true;
771 }
772 
773 static bool valid_markcond(const struct inet_diag_bc_op *op, int len,
774 			   int *min_len)
775 {
776 	*min_len += sizeof(struct inet_diag_markcond);
777 	return len >= *min_len;
778 }
779 
780 static int inet_diag_bc_audit(const struct nlattr *attr,
781 			      const struct sk_buff *skb)
782 {
783 	bool net_admin = netlink_net_capable(skb, CAP_NET_ADMIN);
784 	const void *bytecode, *bc;
785 	int bytecode_len, len;
786 
787 	if (!attr || nla_len(attr) < sizeof(struct inet_diag_bc_op))
788 		return -EINVAL;
789 
790 	bytecode = bc = nla_data(attr);
791 	len = bytecode_len = nla_len(attr);
792 
793 	while (len > 0) {
794 		int min_len = sizeof(struct inet_diag_bc_op);
795 		const struct inet_diag_bc_op *op = bc;
796 
797 		switch (op->code) {
798 		case INET_DIAG_BC_S_COND:
799 		case INET_DIAG_BC_D_COND:
800 			if (!valid_hostcond(bc, len, &min_len))
801 				return -EINVAL;
802 			break;
803 		case INET_DIAG_BC_DEV_COND:
804 			if (!valid_devcond(bc, len, &min_len))
805 				return -EINVAL;
806 			break;
807 		case INET_DIAG_BC_S_EQ:
808 		case INET_DIAG_BC_S_GE:
809 		case INET_DIAG_BC_S_LE:
810 		case INET_DIAG_BC_D_EQ:
811 		case INET_DIAG_BC_D_GE:
812 		case INET_DIAG_BC_D_LE:
813 			if (!valid_port_comparison(bc, len, &min_len))
814 				return -EINVAL;
815 			break;
816 		case INET_DIAG_BC_MARK_COND:
817 			if (!net_admin)
818 				return -EPERM;
819 			if (!valid_markcond(bc, len, &min_len))
820 				return -EINVAL;
821 			break;
822 		case INET_DIAG_BC_AUTO:
823 		case INET_DIAG_BC_JMP:
824 		case INET_DIAG_BC_NOP:
825 			break;
826 		default:
827 			return -EINVAL;
828 		}
829 
830 		if (op->code != INET_DIAG_BC_NOP) {
831 			if (op->no < min_len || op->no > len + 4 || op->no & 3)
832 				return -EINVAL;
833 			if (op->no < len &&
834 			    !valid_cc(bytecode, bytecode_len, len - op->no))
835 				return -EINVAL;
836 		}
837 
838 		if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
839 			return -EINVAL;
840 		bc  += op->yes;
841 		len -= op->yes;
842 	}
843 	return len == 0 ? 0 : -EINVAL;
844 }
845 
846 static int inet_csk_diag_dump(struct sock *sk,
847 			      struct sk_buff *skb,
848 			      struct netlink_callback *cb,
849 			      const struct inet_diag_req_v2 *r,
850 			      const struct nlattr *bc,
851 			      bool net_admin)
852 {
853 	if (!inet_diag_bc_sk(bc, sk))
854 		return 0;
855 
856 	return inet_csk_diag_fill(sk, skb, r,
857 				  sk_user_ns(NETLINK_CB(cb->skb).sk),
858 				  NETLINK_CB(cb->skb).portid,
859 				  cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh,
860 				  net_admin);
861 }
862 
863 static void twsk_build_assert(void)
864 {
865 	BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) !=
866 		     offsetof(struct sock, sk_family));
867 
868 	BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) !=
869 		     offsetof(struct inet_sock, inet_num));
870 
871 	BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) !=
872 		     offsetof(struct inet_sock, inet_dport));
873 
874 	BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) !=
875 		     offsetof(struct inet_sock, inet_rcv_saddr));
876 
877 	BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) !=
878 		     offsetof(struct inet_sock, inet_daddr));
879 
880 #if IS_ENABLED(CONFIG_IPV6)
881 	BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) !=
882 		     offsetof(struct sock, sk_v6_rcv_saddr));
883 
884 	BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) !=
885 		     offsetof(struct sock, sk_v6_daddr));
886 #endif
887 }
888 
889 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
890 			 struct netlink_callback *cb,
891 			 const struct inet_diag_req_v2 *r, struct nlattr *bc)
892 {
893 	bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
894 	struct net *net = sock_net(skb->sk);
895 	u32 idiag_states = r->idiag_states;
896 	int i, num, s_i, s_num;
897 	struct sock *sk;
898 
899 	if (idiag_states & TCPF_SYN_RECV)
900 		idiag_states |= TCPF_NEW_SYN_RECV;
901 	s_i = cb->args[1];
902 	s_num = num = cb->args[2];
903 
904 	if (cb->args[0] == 0) {
905 		if (!(idiag_states & TCPF_LISTEN) || r->id.idiag_dport)
906 			goto skip_listen_ht;
907 
908 		for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
909 			struct inet_listen_hashbucket *ilb;
910 			struct hlist_nulls_node *node;
911 
912 			num = 0;
913 			ilb = &hashinfo->listening_hash[i];
914 			spin_lock(&ilb->lock);
915 			sk_nulls_for_each(sk, node, &ilb->nulls_head) {
916 				struct inet_sock *inet = inet_sk(sk);
917 
918 				if (!net_eq(sock_net(sk), net))
919 					continue;
920 
921 				if (num < s_num) {
922 					num++;
923 					continue;
924 				}
925 
926 				if (r->sdiag_family != AF_UNSPEC &&
927 				    sk->sk_family != r->sdiag_family)
928 					goto next_listen;
929 
930 				if (r->id.idiag_sport != inet->inet_sport &&
931 				    r->id.idiag_sport)
932 					goto next_listen;
933 
934 				if (inet_csk_diag_dump(sk, skb, cb, r,
935 						       bc, net_admin) < 0) {
936 					spin_unlock(&ilb->lock);
937 					goto done;
938 				}
939 
940 next_listen:
941 				++num;
942 			}
943 			spin_unlock(&ilb->lock);
944 
945 			s_num = 0;
946 		}
947 skip_listen_ht:
948 		cb->args[0] = 1;
949 		s_i = num = s_num = 0;
950 	}
951 
952 	if (!(idiag_states & ~TCPF_LISTEN))
953 		goto out;
954 
955 #define SKARR_SZ 16
956 	for (i = s_i; i <= hashinfo->ehash_mask; i++) {
957 		struct inet_ehash_bucket *head = &hashinfo->ehash[i];
958 		spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
959 		struct hlist_nulls_node *node;
960 		struct sock *sk_arr[SKARR_SZ];
961 		int num_arr[SKARR_SZ];
962 		int idx, accum, res;
963 
964 		if (hlist_nulls_empty(&head->chain))
965 			continue;
966 
967 		if (i > s_i)
968 			s_num = 0;
969 
970 next_chunk:
971 		num = 0;
972 		accum = 0;
973 		spin_lock_bh(lock);
974 		sk_nulls_for_each(sk, node, &head->chain) {
975 			int state;
976 
977 			if (!net_eq(sock_net(sk), net))
978 				continue;
979 			if (num < s_num)
980 				goto next_normal;
981 			state = (sk->sk_state == TCP_TIME_WAIT) ?
982 				inet_twsk(sk)->tw_substate : sk->sk_state;
983 			if (!(idiag_states & (1 << state)))
984 				goto next_normal;
985 			if (r->sdiag_family != AF_UNSPEC &&
986 			    sk->sk_family != r->sdiag_family)
987 				goto next_normal;
988 			if (r->id.idiag_sport != htons(sk->sk_num) &&
989 			    r->id.idiag_sport)
990 				goto next_normal;
991 			if (r->id.idiag_dport != sk->sk_dport &&
992 			    r->id.idiag_dport)
993 				goto next_normal;
994 			twsk_build_assert();
995 
996 			if (!inet_diag_bc_sk(bc, sk))
997 				goto next_normal;
998 
999 			if (!refcount_inc_not_zero(&sk->sk_refcnt))
1000 				goto next_normal;
1001 
1002 			num_arr[accum] = num;
1003 			sk_arr[accum] = sk;
1004 			if (++accum == SKARR_SZ)
1005 				break;
1006 next_normal:
1007 			++num;
1008 		}
1009 		spin_unlock_bh(lock);
1010 		res = 0;
1011 		for (idx = 0; idx < accum; idx++) {
1012 			if (res >= 0) {
1013 				res = sk_diag_fill(sk_arr[idx], skb, r,
1014 					   sk_user_ns(NETLINK_CB(cb->skb).sk),
1015 					   NETLINK_CB(cb->skb).portid,
1016 					   cb->nlh->nlmsg_seq, NLM_F_MULTI,
1017 					   cb->nlh, net_admin);
1018 				if (res < 0)
1019 					num = num_arr[idx];
1020 			}
1021 			sock_gen_put(sk_arr[idx]);
1022 		}
1023 		if (res < 0)
1024 			break;
1025 		cond_resched();
1026 		if (accum == SKARR_SZ) {
1027 			s_num = num + 1;
1028 			goto next_chunk;
1029 		}
1030 	}
1031 
1032 done:
1033 	cb->args[1] = i;
1034 	cb->args[2] = num;
1035 out:
1036 	;
1037 }
1038 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
1039 
1040 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
1041 			    const struct inet_diag_req_v2 *r,
1042 			    struct nlattr *bc)
1043 {
1044 	const struct inet_diag_handler *handler;
1045 	int err = 0;
1046 
1047 	handler = inet_diag_lock_handler(r->sdiag_protocol);
1048 	if (!IS_ERR(handler))
1049 		handler->dump(skb, cb, r, bc);
1050 	else
1051 		err = PTR_ERR(handler);
1052 	inet_diag_unlock_handler(handler);
1053 
1054 	return err ? : skb->len;
1055 }
1056 
1057 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
1058 {
1059 	int hdrlen = sizeof(struct inet_diag_req_v2);
1060 	struct nlattr *bc = NULL;
1061 
1062 	if (nlmsg_attrlen(cb->nlh, hdrlen))
1063 		bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1064 
1065 	return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
1066 }
1067 
1068 static int inet_diag_type2proto(int type)
1069 {
1070 	switch (type) {
1071 	case TCPDIAG_GETSOCK:
1072 		return IPPROTO_TCP;
1073 	case DCCPDIAG_GETSOCK:
1074 		return IPPROTO_DCCP;
1075 	default:
1076 		return 0;
1077 	}
1078 }
1079 
1080 static int inet_diag_dump_compat(struct sk_buff *skb,
1081 				 struct netlink_callback *cb)
1082 {
1083 	struct inet_diag_req *rc = nlmsg_data(cb->nlh);
1084 	int hdrlen = sizeof(struct inet_diag_req);
1085 	struct inet_diag_req_v2 req;
1086 	struct nlattr *bc = NULL;
1087 
1088 	req.sdiag_family = AF_UNSPEC; /* compatibility */
1089 	req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
1090 	req.idiag_ext = rc->idiag_ext;
1091 	req.idiag_states = rc->idiag_states;
1092 	req.id = rc->id;
1093 
1094 	if (nlmsg_attrlen(cb->nlh, hdrlen))
1095 		bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1096 
1097 	return __inet_diag_dump(skb, cb, &req, bc);
1098 }
1099 
1100 static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
1101 				      const struct nlmsghdr *nlh)
1102 {
1103 	struct inet_diag_req *rc = nlmsg_data(nlh);
1104 	struct inet_diag_req_v2 req;
1105 
1106 	req.sdiag_family = rc->idiag_family;
1107 	req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
1108 	req.idiag_ext = rc->idiag_ext;
1109 	req.idiag_states = rc->idiag_states;
1110 	req.id = rc->id;
1111 
1112 	return inet_diag_cmd_exact(SOCK_DIAG_BY_FAMILY, in_skb, nlh, &req);
1113 }
1114 
1115 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
1116 {
1117 	int hdrlen = sizeof(struct inet_diag_req);
1118 	struct net *net = sock_net(skb->sk);
1119 
1120 	if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
1121 	    nlmsg_len(nlh) < hdrlen)
1122 		return -EINVAL;
1123 
1124 	if (nlh->nlmsg_flags & NLM_F_DUMP) {
1125 		if (nlmsg_attrlen(nlh, hdrlen)) {
1126 			struct nlattr *attr;
1127 			int err;
1128 
1129 			attr = nlmsg_find_attr(nlh, hdrlen,
1130 					       INET_DIAG_REQ_BYTECODE);
1131 			err = inet_diag_bc_audit(attr, skb);
1132 			if (err)
1133 				return err;
1134 		}
1135 		{
1136 			struct netlink_dump_control c = {
1137 				.dump = inet_diag_dump_compat,
1138 			};
1139 			return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
1140 		}
1141 	}
1142 
1143 	return inet_diag_get_exact_compat(skb, nlh);
1144 }
1145 
1146 static int inet_diag_handler_cmd(struct sk_buff *skb, struct nlmsghdr *h)
1147 {
1148 	int hdrlen = sizeof(struct inet_diag_req_v2);
1149 	struct net *net = sock_net(skb->sk);
1150 
1151 	if (nlmsg_len(h) < hdrlen)
1152 		return -EINVAL;
1153 
1154 	if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
1155 	    h->nlmsg_flags & NLM_F_DUMP) {
1156 		if (nlmsg_attrlen(h, hdrlen)) {
1157 			struct nlattr *attr;
1158 			int err;
1159 
1160 			attr = nlmsg_find_attr(h, hdrlen,
1161 					       INET_DIAG_REQ_BYTECODE);
1162 			err = inet_diag_bc_audit(attr, skb);
1163 			if (err)
1164 				return err;
1165 		}
1166 		{
1167 			struct netlink_dump_control c = {
1168 				.dump = inet_diag_dump,
1169 			};
1170 			return netlink_dump_start(net->diag_nlsk, skb, h, &c);
1171 		}
1172 	}
1173 
1174 	return inet_diag_cmd_exact(h->nlmsg_type, skb, h, nlmsg_data(h));
1175 }
1176 
1177 static
1178 int inet_diag_handler_get_info(struct sk_buff *skb, struct sock *sk)
1179 {
1180 	const struct inet_diag_handler *handler;
1181 	struct nlmsghdr *nlh;
1182 	struct nlattr *attr;
1183 	struct inet_diag_msg *r;
1184 	void *info = NULL;
1185 	int err = 0;
1186 
1187 	nlh = nlmsg_put(skb, 0, 0, SOCK_DIAG_BY_FAMILY, sizeof(*r), 0);
1188 	if (!nlh)
1189 		return -ENOMEM;
1190 
1191 	r = nlmsg_data(nlh);
1192 	memset(r, 0, sizeof(*r));
1193 	inet_diag_msg_common_fill(r, sk);
1194 	if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_STREAM)
1195 		r->id.idiag_sport = inet_sk(sk)->inet_sport;
1196 	r->idiag_state = sk->sk_state;
1197 
1198 	if ((err = nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))) {
1199 		nlmsg_cancel(skb, nlh);
1200 		return err;
1201 	}
1202 
1203 	handler = inet_diag_lock_handler(sk->sk_protocol);
1204 	if (IS_ERR(handler)) {
1205 		inet_diag_unlock_handler(handler);
1206 		nlmsg_cancel(skb, nlh);
1207 		return PTR_ERR(handler);
1208 	}
1209 
1210 	attr = handler->idiag_info_size
1211 		? nla_reserve_64bit(skb, INET_DIAG_INFO,
1212 				    handler->idiag_info_size,
1213 				    INET_DIAG_PAD)
1214 		: NULL;
1215 	if (attr)
1216 		info = nla_data(attr);
1217 
1218 	handler->idiag_get_info(sk, r, info);
1219 	inet_diag_unlock_handler(handler);
1220 
1221 	nlmsg_end(skb, nlh);
1222 	return 0;
1223 }
1224 
1225 static const struct sock_diag_handler inet_diag_handler = {
1226 	.family = AF_INET,
1227 	.dump = inet_diag_handler_cmd,
1228 	.get_info = inet_diag_handler_get_info,
1229 	.destroy = inet_diag_handler_cmd,
1230 };
1231 
1232 static const struct sock_diag_handler inet6_diag_handler = {
1233 	.family = AF_INET6,
1234 	.dump = inet_diag_handler_cmd,
1235 	.get_info = inet_diag_handler_get_info,
1236 	.destroy = inet_diag_handler_cmd,
1237 };
1238 
1239 int inet_diag_register(const struct inet_diag_handler *h)
1240 {
1241 	const __u16 type = h->idiag_type;
1242 	int err = -EINVAL;
1243 
1244 	if (type >= IPPROTO_MAX)
1245 		goto out;
1246 
1247 	mutex_lock(&inet_diag_table_mutex);
1248 	err = -EEXIST;
1249 	if (!inet_diag_table[type]) {
1250 		inet_diag_table[type] = h;
1251 		err = 0;
1252 	}
1253 	mutex_unlock(&inet_diag_table_mutex);
1254 out:
1255 	return err;
1256 }
1257 EXPORT_SYMBOL_GPL(inet_diag_register);
1258 
1259 void inet_diag_unregister(const struct inet_diag_handler *h)
1260 {
1261 	const __u16 type = h->idiag_type;
1262 
1263 	if (type >= IPPROTO_MAX)
1264 		return;
1265 
1266 	mutex_lock(&inet_diag_table_mutex);
1267 	inet_diag_table[type] = NULL;
1268 	mutex_unlock(&inet_diag_table_mutex);
1269 }
1270 EXPORT_SYMBOL_GPL(inet_diag_unregister);
1271 
1272 static int __init inet_diag_init(void)
1273 {
1274 	const int inet_diag_table_size = (IPPROTO_MAX *
1275 					  sizeof(struct inet_diag_handler *));
1276 	int err = -ENOMEM;
1277 
1278 	inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1279 	if (!inet_diag_table)
1280 		goto out;
1281 
1282 	err = sock_diag_register(&inet_diag_handler);
1283 	if (err)
1284 		goto out_free_nl;
1285 
1286 	err = sock_diag_register(&inet6_diag_handler);
1287 	if (err)
1288 		goto out_free_inet;
1289 
1290 	sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1291 out:
1292 	return err;
1293 
1294 out_free_inet:
1295 	sock_diag_unregister(&inet_diag_handler);
1296 out_free_nl:
1297 	kfree(inet_diag_table);
1298 	goto out;
1299 }
1300 
1301 static void __exit inet_diag_exit(void)
1302 {
1303 	sock_diag_unregister(&inet6_diag_handler);
1304 	sock_diag_unregister(&inet_diag_handler);
1305 	sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1306 	kfree(inet_diag_table);
1307 }
1308 
1309 module_init(inet_diag_init);
1310 module_exit(inet_diag_exit);
1311 MODULE_LICENSE("GPL");
1312 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1313 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);
1314