xref: /openbmc/linux/net/ipv4/inet_diag.c (revision aa0dc6a7) 
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/bpf_sk_storage.h>
27 #include <net/netlink.h>
28 
29 #include <linux/inet.h>
30 #include <linux/stddef.h>
31 
32 #include <linux/inet_diag.h>
33 #include <linux/sock_diag.h>
34 
35 static const struct inet_diag_handler **inet_diag_table;
36 
37 struct inet_diag_entry {
38 	const __be32 *saddr;
39 	const __be32 *daddr;
40 	u16 sport;
41 	u16 dport;
42 	u16 family;
43 	u16 userlocks;
44 	u32 ifindex;
45 	u32 mark;
46 #ifdef CONFIG_SOCK_CGROUP_DATA
47 	u64 cgroup_id;
48 #endif
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 (proto < 0 || proto >= IPPROTO_MAX) {
56 		mutex_lock(&inet_diag_table_mutex);
57 		return ERR_PTR(-ENOENT);
58 	}
59 
60 	if (!inet_diag_table[proto])
61 		sock_load_diag_module(AF_INET, proto);
62 
63 	mutex_lock(&inet_diag_table_mutex);
64 	if (!inet_diag_table[proto])
65 		return ERR_PTR(-ENOENT);
66 
67 	return inet_diag_table[proto];
68 }
69 
70 static void inet_diag_unlock_handler(const struct inet_diag_handler *handler)
71 {
72 	mutex_unlock(&inet_diag_table_mutex);
73 }
74 
75 void inet_diag_msg_common_fill(struct inet_diag_msg *r, struct sock *sk)
76 {
77 	r->idiag_family = sk->sk_family;
78 
79 	r->id.idiag_sport = htons(sk->sk_num);
80 	r->id.idiag_dport = sk->sk_dport;
81 	r->id.idiag_if = sk->sk_bound_dev_if;
82 	sock_diag_save_cookie(sk, r->id.idiag_cookie);
83 
84 #if IS_ENABLED(CONFIG_IPV6)
85 	if (sk->sk_family == AF_INET6) {
86 		*(struct in6_addr *)r->id.idiag_src = sk->sk_v6_rcv_saddr;
87 		*(struct in6_addr *)r->id.idiag_dst = sk->sk_v6_daddr;
88 	} else
89 #endif
90 	{
91 	memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
92 	memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
93 
94 	r->id.idiag_src[0] = sk->sk_rcv_saddr;
95 	r->id.idiag_dst[0] = sk->sk_daddr;
96 	}
97 }
98 EXPORT_SYMBOL_GPL(inet_diag_msg_common_fill);
99 
100 static size_t inet_sk_attr_size(struct sock *sk,
101 				const struct inet_diag_req_v2 *req,
102 				bool net_admin)
103 {
104 	const struct inet_diag_handler *handler;
105 	size_t aux = 0;
106 
107 	handler = inet_diag_table[req->sdiag_protocol];
108 	if (handler && handler->idiag_get_aux_size)
109 		aux = handler->idiag_get_aux_size(sk, net_admin);
110 
111 	return	  nla_total_size(sizeof(struct tcp_info))
112 		+ nla_total_size(sizeof(struct inet_diag_msg))
113 		+ inet_diag_msg_attrs_size()
114 		+ nla_total_size(sizeof(struct inet_diag_meminfo))
115 		+ nla_total_size(SK_MEMINFO_VARS * sizeof(u32))
116 		+ nla_total_size(TCP_CA_NAME_MAX)
117 		+ nla_total_size(sizeof(struct tcpvegas_info))
118 		+ aux
119 		+ 64;
120 }
121 
122 int inet_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb,
123 			     struct inet_diag_msg *r, int ext,
124 			     struct user_namespace *user_ns,
125 			     bool net_admin)
126 {
127 	const struct inet_sock *inet = inet_sk(sk);
128 	struct inet_diag_sockopt inet_sockopt;
129 
130 	if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown))
131 		goto errout;
132 
133 	/* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
134 	 * hence this needs to be included regardless of socket family.
135 	 */
136 	if (ext & (1 << (INET_DIAG_TOS - 1)))
137 		if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0)
138 			goto errout;
139 
140 #if IS_ENABLED(CONFIG_IPV6)
141 	if (r->idiag_family == AF_INET6) {
142 		if (ext & (1 << (INET_DIAG_TCLASS - 1)))
143 			if (nla_put_u8(skb, INET_DIAG_TCLASS,
144 				       inet6_sk(sk)->tclass) < 0)
145 				goto errout;
146 
147 		if (((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
148 		    nla_put_u8(skb, INET_DIAG_SKV6ONLY, ipv6_only_sock(sk)))
149 			goto errout;
150 	}
151 #endif
152 
153 	if (net_admin && nla_put_u32(skb, INET_DIAG_MARK, sk->sk_mark))
154 		goto errout;
155 
156 	if (ext & (1 << (INET_DIAG_CLASS_ID - 1)) ||
157 	    ext & (1 << (INET_DIAG_TCLASS - 1))) {
158 		u32 classid = 0;
159 
160 #ifdef CONFIG_SOCK_CGROUP_DATA
161 		classid = sock_cgroup_classid(&sk->sk_cgrp_data);
162 #endif
163 		/* Fallback to socket priority if class id isn't set.
164 		 * Classful qdiscs use it as direct reference to class.
165 		 * For cgroup2 classid is always zero.
166 		 */
167 		if (!classid)
168 			classid = sk->sk_priority;
169 
170 		if (nla_put_u32(skb, INET_DIAG_CLASS_ID, classid))
171 			goto errout;
172 	}
173 
174 #ifdef CONFIG_SOCK_CGROUP_DATA
175 	if (nla_put_u64_64bit(skb, INET_DIAG_CGROUP_ID,
176 			      cgroup_id(sock_cgroup_ptr(&sk->sk_cgrp_data)),
177 			      INET_DIAG_PAD))
178 		goto errout;
179 #endif
180 
181 	r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
182 	r->idiag_inode = sock_i_ino(sk);
183 
184 	memset(&inet_sockopt, 0, sizeof(inet_sockopt));
185 	inet_sockopt.recverr	= inet->recverr;
186 	inet_sockopt.is_icsk	= inet->is_icsk;
187 	inet_sockopt.freebind	= inet->freebind;
188 	inet_sockopt.hdrincl	= inet->hdrincl;
189 	inet_sockopt.mc_loop	= inet->mc_loop;
190 	inet_sockopt.transparent = inet->transparent;
191 	inet_sockopt.mc_all	= inet->mc_all;
192 	inet_sockopt.nodefrag	= inet->nodefrag;
193 	inet_sockopt.bind_address_no_port = inet->bind_address_no_port;
194 	inet_sockopt.recverr_rfc4884 = inet->recverr_rfc4884;
195 	inet_sockopt.defer_connect = inet->defer_connect;
196 	if (nla_put(skb, INET_DIAG_SOCKOPT, sizeof(inet_sockopt),
197 		    &inet_sockopt))
198 		goto errout;
199 
200 	return 0;
201 errout:
202 	return 1;
203 }
204 EXPORT_SYMBOL_GPL(inet_diag_msg_attrs_fill);
205 
206 static int inet_diag_parse_attrs(const struct nlmsghdr *nlh, int hdrlen,
207 				 struct nlattr **req_nlas)
208 {
209 	struct nlattr *nla;
210 	int remaining;
211 
212 	nlmsg_for_each_attr(nla, nlh, hdrlen, remaining) {
213 		int type = nla_type(nla);
214 
215 		if (type == INET_DIAG_REQ_PROTOCOL && nla_len(nla) != sizeof(u32))
216 			return -EINVAL;
217 
218 		if (type < __INET_DIAG_REQ_MAX)
219 			req_nlas[type] = nla;
220 	}
221 	return 0;
222 }
223 
224 static int inet_diag_get_protocol(const struct inet_diag_req_v2 *req,
225 				  const struct inet_diag_dump_data *data)
226 {
227 	if (data->req_nlas[INET_DIAG_REQ_PROTOCOL])
228 		return nla_get_u32(data->req_nlas[INET_DIAG_REQ_PROTOCOL]);
229 	return req->sdiag_protocol;
230 }
231 
232 #define MAX_DUMP_ALLOC_SIZE (KMALLOC_MAX_SIZE - SKB_DATA_ALIGN(sizeof(struct skb_shared_info)))
233 
234 int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
235 		      struct sk_buff *skb, struct netlink_callback *cb,
236 		      const struct inet_diag_req_v2 *req,
237 		      u16 nlmsg_flags, bool net_admin)
238 {
239 	const struct tcp_congestion_ops *ca_ops;
240 	const struct inet_diag_handler *handler;
241 	struct inet_diag_dump_data *cb_data;
242 	int ext = req->idiag_ext;
243 	struct inet_diag_msg *r;
244 	struct nlmsghdr  *nlh;
245 	struct nlattr *attr;
246 	void *info = NULL;
247 
248 	cb_data = cb->data;
249 	handler = inet_diag_table[inet_diag_get_protocol(req, cb_data)];
250 	BUG_ON(!handler);
251 
252 	nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
253 			cb->nlh->nlmsg_type, sizeof(*r), nlmsg_flags);
254 	if (!nlh)
255 		return -EMSGSIZE;
256 
257 	r = nlmsg_data(nlh);
258 	BUG_ON(!sk_fullsock(sk));
259 
260 	inet_diag_msg_common_fill(r, sk);
261 	r->idiag_state = sk->sk_state;
262 	r->idiag_timer = 0;
263 	r->idiag_retrans = 0;
264 
265 	if (inet_diag_msg_attrs_fill(sk, skb, r, ext,
266 				     sk_user_ns(NETLINK_CB(cb->skb).sk),
267 				     net_admin))
268 		goto errout;
269 
270 	if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
271 		struct inet_diag_meminfo minfo = {
272 			.idiag_rmem = sk_rmem_alloc_get(sk),
273 			.idiag_wmem = READ_ONCE(sk->sk_wmem_queued),
274 			.idiag_fmem = sk->sk_forward_alloc,
275 			.idiag_tmem = sk_wmem_alloc_get(sk),
276 		};
277 
278 		if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
279 			goto errout;
280 	}
281 
282 	if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
283 		if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
284 			goto errout;
285 
286 	/*
287 	 * RAW sockets might have user-defined protocols assigned,
288 	 * so report the one supplied on socket creation.
289 	 */
290 	if (sk->sk_type == SOCK_RAW) {
291 		if (nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))
292 			goto errout;
293 	}
294 
295 	if (!icsk) {
296 		handler->idiag_get_info(sk, r, NULL);
297 		goto out;
298 	}
299 
300 	if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
301 	    icsk->icsk_pending == ICSK_TIME_REO_TIMEOUT ||
302 	    icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
303 		r->idiag_timer = 1;
304 		r->idiag_retrans = icsk->icsk_retransmits;
305 		r->idiag_expires =
306 			jiffies_delta_to_msecs(icsk->icsk_timeout - jiffies);
307 	} else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
308 		r->idiag_timer = 4;
309 		r->idiag_retrans = icsk->icsk_probes_out;
310 		r->idiag_expires =
311 			jiffies_delta_to_msecs(icsk->icsk_timeout - jiffies);
312 	} else if (timer_pending(&sk->sk_timer)) {
313 		r->idiag_timer = 2;
314 		r->idiag_retrans = icsk->icsk_probes_out;
315 		r->idiag_expires =
316 			jiffies_delta_to_msecs(sk->sk_timer.expires - jiffies);
317 	} else {
318 		r->idiag_timer = 0;
319 		r->idiag_expires = 0;
320 	}
321 
322 	if ((ext & (1 << (INET_DIAG_INFO - 1))) && handler->idiag_info_size) {
323 		attr = nla_reserve_64bit(skb, INET_DIAG_INFO,
324 					 handler->idiag_info_size,
325 					 INET_DIAG_PAD);
326 		if (!attr)
327 			goto errout;
328 
329 		info = nla_data(attr);
330 	}
331 
332 	if (ext & (1 << (INET_DIAG_CONG - 1))) {
333 		int err = 0;
334 
335 		rcu_read_lock();
336 		ca_ops = READ_ONCE(icsk->icsk_ca_ops);
337 		if (ca_ops)
338 			err = nla_put_string(skb, INET_DIAG_CONG, ca_ops->name);
339 		rcu_read_unlock();
340 		if (err < 0)
341 			goto errout;
342 	}
343 
344 	handler->idiag_get_info(sk, r, info);
345 
346 	if (ext & (1 << (INET_DIAG_INFO - 1)) && handler->idiag_get_aux)
347 		if (handler->idiag_get_aux(sk, net_admin, skb) < 0)
348 			goto errout;
349 
350 	if (sk->sk_state < TCP_TIME_WAIT) {
351 		union tcp_cc_info info;
352 		size_t sz = 0;
353 		int attr;
354 
355 		rcu_read_lock();
356 		ca_ops = READ_ONCE(icsk->icsk_ca_ops);
357 		if (ca_ops && ca_ops->get_info)
358 			sz = ca_ops->get_info(sk, ext, &attr, &info);
359 		rcu_read_unlock();
360 		if (sz && nla_put(skb, attr, sz, &info) < 0)
361 			goto errout;
362 	}
363 
364 	/* Keep it at the end for potential retry with a larger skb,
365 	 * or else do best-effort fitting, which is only done for the
366 	 * first_nlmsg.
367 	 */
368 	if (cb_data->bpf_stg_diag) {
369 		bool first_nlmsg = ((unsigned char *)nlh == skb->data);
370 		unsigned int prev_min_dump_alloc;
371 		unsigned int total_nla_size = 0;
372 		unsigned int msg_len;
373 		int err;
374 
375 		msg_len = skb_tail_pointer(skb) - (unsigned char *)nlh;
376 		err = bpf_sk_storage_diag_put(cb_data->bpf_stg_diag, sk, skb,
377 					      INET_DIAG_SK_BPF_STORAGES,
378 					      &total_nla_size);
379 
380 		if (!err)
381 			goto out;
382 
383 		total_nla_size += msg_len;
384 		prev_min_dump_alloc = cb->min_dump_alloc;
385 		if (total_nla_size > prev_min_dump_alloc)
386 			cb->min_dump_alloc = min_t(u32, total_nla_size,
387 						   MAX_DUMP_ALLOC_SIZE);
388 
389 		if (!first_nlmsg)
390 			goto errout;
391 
392 		if (cb->min_dump_alloc > prev_min_dump_alloc)
393 			/* Retry with pskb_expand_head() with
394 			 * __GFP_DIRECT_RECLAIM
395 			 */
396 			goto errout;
397 
398 		WARN_ON_ONCE(total_nla_size <= prev_min_dump_alloc);
399 
400 		/* Send what we have for this sk
401 		 * and move on to the next sk in the following
402 		 * dump()
403 		 */
404 	}
405 
406 out:
407 	nlmsg_end(skb, nlh);
408 	return 0;
409 
410 errout:
411 	nlmsg_cancel(skb, nlh);
412 	return -EMSGSIZE;
413 }
414 EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
415 
416 static int inet_twsk_diag_fill(struct sock *sk,
417 			       struct sk_buff *skb,
418 			       struct netlink_callback *cb,
419 			       u16 nlmsg_flags, bool net_admin)
420 {
421 	struct inet_timewait_sock *tw = inet_twsk(sk);
422 	struct inet_diag_msg *r;
423 	struct nlmsghdr *nlh;
424 	long tmo;
425 
426 	nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid,
427 			cb->nlh->nlmsg_seq, cb->nlh->nlmsg_type,
428 			sizeof(*r), nlmsg_flags);
429 	if (!nlh)
430 		return -EMSGSIZE;
431 
432 	r = nlmsg_data(nlh);
433 	BUG_ON(tw->tw_state != TCP_TIME_WAIT);
434 
435 	inet_diag_msg_common_fill(r, sk);
436 	r->idiag_retrans      = 0;
437 
438 	r->idiag_state	      = tw->tw_substate;
439 	r->idiag_timer	      = 3;
440 	tmo = tw->tw_timer.expires - jiffies;
441 	r->idiag_expires      = jiffies_delta_to_msecs(tmo);
442 	r->idiag_rqueue	      = 0;
443 	r->idiag_wqueue	      = 0;
444 	r->idiag_uid	      = 0;
445 	r->idiag_inode	      = 0;
446 
447 	if (net_admin && nla_put_u32(skb, INET_DIAG_MARK,
448 				     tw->tw_mark)) {
449 		nlmsg_cancel(skb, nlh);
450 		return -EMSGSIZE;
451 	}
452 
453 	nlmsg_end(skb, nlh);
454 	return 0;
455 }
456 
457 static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb,
458 			      struct netlink_callback *cb,
459 			      u16 nlmsg_flags, bool net_admin)
460 {
461 	struct request_sock *reqsk = inet_reqsk(sk);
462 	struct inet_diag_msg *r;
463 	struct nlmsghdr *nlh;
464 	long tmo;
465 
466 	nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
467 			cb->nlh->nlmsg_type, sizeof(*r), nlmsg_flags);
468 	if (!nlh)
469 		return -EMSGSIZE;
470 
471 	r = nlmsg_data(nlh);
472 	inet_diag_msg_common_fill(r, sk);
473 	r->idiag_state = TCP_SYN_RECV;
474 	r->idiag_timer = 1;
475 	r->idiag_retrans = reqsk->num_retrans;
476 
477 	BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) !=
478 		     offsetof(struct sock, sk_cookie));
479 
480 	tmo = inet_reqsk(sk)->rsk_timer.expires - jiffies;
481 	r->idiag_expires = jiffies_delta_to_msecs(tmo);
482 	r->idiag_rqueue	= 0;
483 	r->idiag_wqueue	= 0;
484 	r->idiag_uid	= 0;
485 	r->idiag_inode	= 0;
486 
487 	if (net_admin && nla_put_u32(skb, INET_DIAG_MARK,
488 				     inet_rsk(reqsk)->ir_mark)) {
489 		nlmsg_cancel(skb, nlh);
490 		return -EMSGSIZE;
491 	}
492 
493 	nlmsg_end(skb, nlh);
494 	return 0;
495 }
496 
497 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
498 			struct netlink_callback *cb,
499 			const struct inet_diag_req_v2 *r,
500 			u16 nlmsg_flags, bool net_admin)
501 {
502 	if (sk->sk_state == TCP_TIME_WAIT)
503 		return inet_twsk_diag_fill(sk, skb, cb, nlmsg_flags, net_admin);
504 
505 	if (sk->sk_state == TCP_NEW_SYN_RECV)
506 		return inet_req_diag_fill(sk, skb, cb, nlmsg_flags, net_admin);
507 
508 	return inet_sk_diag_fill(sk, inet_csk(sk), skb, cb, r, nlmsg_flags,
509 				 net_admin);
510 }
511 
512 struct sock *inet_diag_find_one_icsk(struct net *net,
513 				     struct inet_hashinfo *hashinfo,
514 				     const struct inet_diag_req_v2 *req)
515 {
516 	struct sock *sk;
517 
518 	rcu_read_lock();
519 	if (req->sdiag_family == AF_INET)
520 		sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[0],
521 				 req->id.idiag_dport, req->id.idiag_src[0],
522 				 req->id.idiag_sport, req->id.idiag_if);
523 #if IS_ENABLED(CONFIG_IPV6)
524 	else if (req->sdiag_family == AF_INET6) {
525 		if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) &&
526 		    ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src))
527 			sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[3],
528 					 req->id.idiag_dport, req->id.idiag_src[3],
529 					 req->id.idiag_sport, req->id.idiag_if);
530 		else
531 			sk = inet6_lookup(net, hashinfo, NULL, 0,
532 					  (struct in6_addr *)req->id.idiag_dst,
533 					  req->id.idiag_dport,
534 					  (struct in6_addr *)req->id.idiag_src,
535 					  req->id.idiag_sport,
536 					  req->id.idiag_if);
537 	}
538 #endif
539 	else {
540 		rcu_read_unlock();
541 		return ERR_PTR(-EINVAL);
542 	}
543 	rcu_read_unlock();
544 	if (!sk)
545 		return ERR_PTR(-ENOENT);
546 
547 	if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) {
548 		sock_gen_put(sk);
549 		return ERR_PTR(-ENOENT);
550 	}
551 
552 	return sk;
553 }
554 EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk);
555 
556 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo,
557 			    struct netlink_callback *cb,
558 			    const struct inet_diag_req_v2 *req)
559 {
560 	struct sk_buff *in_skb = cb->skb;
561 	bool net_admin = netlink_net_capable(in_skb, CAP_NET_ADMIN);
562 	struct net *net = sock_net(in_skb->sk);
563 	struct sk_buff *rep;
564 	struct sock *sk;
565 	int err;
566 
567 	sk = inet_diag_find_one_icsk(net, hashinfo, req);
568 	if (IS_ERR(sk))
569 		return PTR_ERR(sk);
570 
571 	rep = nlmsg_new(inet_sk_attr_size(sk, req, net_admin), GFP_KERNEL);
572 	if (!rep) {
573 		err = -ENOMEM;
574 		goto out;
575 	}
576 
577 	err = sk_diag_fill(sk, rep, cb, req, 0, net_admin);
578 	if (err < 0) {
579 		WARN_ON(err == -EMSGSIZE);
580 		nlmsg_free(rep);
581 		goto out;
582 	}
583 	err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
584 			      MSG_DONTWAIT);
585 	if (err > 0)
586 		err = 0;
587 
588 out:
589 	if (sk)
590 		sock_gen_put(sk);
591 
592 	return err;
593 }
594 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
595 
596 static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb,
597 			       const struct nlmsghdr *nlh,
598 			       int hdrlen,
599 			       const struct inet_diag_req_v2 *req)
600 {
601 	const struct inet_diag_handler *handler;
602 	struct inet_diag_dump_data dump_data;
603 	int err, protocol;
604 
605 	memset(&dump_data, 0, sizeof(dump_data));
606 	err = inet_diag_parse_attrs(nlh, hdrlen, dump_data.req_nlas);
607 	if (err)
608 		return err;
609 
610 	protocol = inet_diag_get_protocol(req, &dump_data);
611 
612 	handler = inet_diag_lock_handler(protocol);
613 	if (IS_ERR(handler)) {
614 		err = PTR_ERR(handler);
615 	} else if (cmd == SOCK_DIAG_BY_FAMILY) {
616 		struct netlink_callback cb = {
617 			.nlh = nlh,
618 			.skb = in_skb,
619 			.data = &dump_data,
620 		};
621 		err = handler->dump_one(&cb, req);
622 	} else if (cmd == SOCK_DESTROY && handler->destroy) {
623 		err = handler->destroy(in_skb, req);
624 	} else {
625 		err = -EOPNOTSUPP;
626 	}
627 	inet_diag_unlock_handler(handler);
628 
629 	return err;
630 }
631 
632 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
633 {
634 	int words = bits >> 5;
635 
636 	bits &= 0x1f;
637 
638 	if (words) {
639 		if (memcmp(a1, a2, words << 2))
640 			return 0;
641 	}
642 	if (bits) {
643 		__be32 w1, w2;
644 		__be32 mask;
645 
646 		w1 = a1[words];
647 		w2 = a2[words];
648 
649 		mask = htonl((0xffffffff) << (32 - bits));
650 
651 		if ((w1 ^ w2) & mask)
652 			return 0;
653 	}
654 
655 	return 1;
656 }
657 
658 static int inet_diag_bc_run(const struct nlattr *_bc,
659 			    const struct inet_diag_entry *entry)
660 {
661 	const void *bc = nla_data(_bc);
662 	int len = nla_len(_bc);
663 
664 	while (len > 0) {
665 		int yes = 1;
666 		const struct inet_diag_bc_op *op = bc;
667 
668 		switch (op->code) {
669 		case INET_DIAG_BC_NOP:
670 			break;
671 		case INET_DIAG_BC_JMP:
672 			yes = 0;
673 			break;
674 		case INET_DIAG_BC_S_EQ:
675 			yes = entry->sport == op[1].no;
676 			break;
677 		case INET_DIAG_BC_S_GE:
678 			yes = entry->sport >= op[1].no;
679 			break;
680 		case INET_DIAG_BC_S_LE:
681 			yes = entry->sport <= op[1].no;
682 			break;
683 		case INET_DIAG_BC_D_EQ:
684 			yes = entry->dport == op[1].no;
685 			break;
686 		case INET_DIAG_BC_D_GE:
687 			yes = entry->dport >= op[1].no;
688 			break;
689 		case INET_DIAG_BC_D_LE:
690 			yes = entry->dport <= op[1].no;
691 			break;
692 		case INET_DIAG_BC_AUTO:
693 			yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
694 			break;
695 		case INET_DIAG_BC_S_COND:
696 		case INET_DIAG_BC_D_COND: {
697 			const struct inet_diag_hostcond *cond;
698 			const __be32 *addr;
699 
700 			cond = (const struct inet_diag_hostcond *)(op + 1);
701 			if (cond->port != -1 &&
702 			    cond->port != (op->code == INET_DIAG_BC_S_COND ?
703 					     entry->sport : entry->dport)) {
704 				yes = 0;
705 				break;
706 			}
707 
708 			if (op->code == INET_DIAG_BC_S_COND)
709 				addr = entry->saddr;
710 			else
711 				addr = entry->daddr;
712 
713 			if (cond->family != AF_UNSPEC &&
714 			    cond->family != entry->family) {
715 				if (entry->family == AF_INET6 &&
716 				    cond->family == AF_INET) {
717 					if (addr[0] == 0 && addr[1] == 0 &&
718 					    addr[2] == htonl(0xffff) &&
719 					    bitstring_match(addr + 3,
720 							    cond->addr,
721 							    cond->prefix_len))
722 						break;
723 				}
724 				yes = 0;
725 				break;
726 			}
727 
728 			if (cond->prefix_len == 0)
729 				break;
730 			if (bitstring_match(addr, cond->addr,
731 					    cond->prefix_len))
732 				break;
733 			yes = 0;
734 			break;
735 		}
736 		case INET_DIAG_BC_DEV_COND: {
737 			u32 ifindex;
738 
739 			ifindex = *((const u32 *)(op + 1));
740 			if (ifindex != entry->ifindex)
741 				yes = 0;
742 			break;
743 		}
744 		case INET_DIAG_BC_MARK_COND: {
745 			struct inet_diag_markcond *cond;
746 
747 			cond = (struct inet_diag_markcond *)(op + 1);
748 			if ((entry->mark & cond->mask) != cond->mark)
749 				yes = 0;
750 			break;
751 		}
752 #ifdef CONFIG_SOCK_CGROUP_DATA
753 		case INET_DIAG_BC_CGROUP_COND: {
754 			u64 cgroup_id;
755 
756 			cgroup_id = get_unaligned((const u64 *)(op + 1));
757 			if (cgroup_id != entry->cgroup_id)
758 				yes = 0;
759 			break;
760 		}
761 #endif
762 		}
763 
764 		if (yes) {
765 			len -= op->yes;
766 			bc += op->yes;
767 		} else {
768 			len -= op->no;
769 			bc += op->no;
770 		}
771 	}
772 	return len == 0;
773 }
774 
775 /* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV)
776  */
777 static void entry_fill_addrs(struct inet_diag_entry *entry,
778 			     const struct sock *sk)
779 {
780 #if IS_ENABLED(CONFIG_IPV6)
781 	if (sk->sk_family == AF_INET6) {
782 		entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32;
783 		entry->daddr = sk->sk_v6_daddr.s6_addr32;
784 	} else
785 #endif
786 	{
787 		entry->saddr = &sk->sk_rcv_saddr;
788 		entry->daddr = &sk->sk_daddr;
789 	}
790 }
791 
792 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
793 {
794 	struct inet_sock *inet = inet_sk(sk);
795 	struct inet_diag_entry entry;
796 
797 	if (!bc)
798 		return 1;
799 
800 	entry.family = sk->sk_family;
801 	entry_fill_addrs(&entry, sk);
802 	entry.sport = inet->inet_num;
803 	entry.dport = ntohs(inet->inet_dport);
804 	entry.ifindex = sk->sk_bound_dev_if;
805 	entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0;
806 	if (sk_fullsock(sk))
807 		entry.mark = sk->sk_mark;
808 	else if (sk->sk_state == TCP_NEW_SYN_RECV)
809 		entry.mark = inet_rsk(inet_reqsk(sk))->ir_mark;
810 	else if (sk->sk_state == TCP_TIME_WAIT)
811 		entry.mark = inet_twsk(sk)->tw_mark;
812 	else
813 		entry.mark = 0;
814 #ifdef CONFIG_SOCK_CGROUP_DATA
815 	entry.cgroup_id = sk_fullsock(sk) ?
816 		cgroup_id(sock_cgroup_ptr(&sk->sk_cgrp_data)) : 0;
817 #endif
818 
819 	return inet_diag_bc_run(bc, &entry);
820 }
821 EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
822 
823 static int valid_cc(const void *bc, int len, int cc)
824 {
825 	while (len >= 0) {
826 		const struct inet_diag_bc_op *op = bc;
827 
828 		if (cc > len)
829 			return 0;
830 		if (cc == len)
831 			return 1;
832 		if (op->yes < 4 || op->yes & 3)
833 			return 0;
834 		len -= op->yes;
835 		bc  += op->yes;
836 	}
837 	return 0;
838 }
839 
840 /* data is u32 ifindex */
841 static bool valid_devcond(const struct inet_diag_bc_op *op, int len,
842 			  int *min_len)
843 {
844 	/* Check ifindex space. */
845 	*min_len += sizeof(u32);
846 	if (len < *min_len)
847 		return false;
848 
849 	return true;
850 }
851 /* Validate an inet_diag_hostcond. */
852 static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
853 			   int *min_len)
854 {
855 	struct inet_diag_hostcond *cond;
856 	int addr_len;
857 
858 	/* Check hostcond space. */
859 	*min_len += sizeof(struct inet_diag_hostcond);
860 	if (len < *min_len)
861 		return false;
862 	cond = (struct inet_diag_hostcond *)(op + 1);
863 
864 	/* Check address family and address length. */
865 	switch (cond->family) {
866 	case AF_UNSPEC:
867 		addr_len = 0;
868 		break;
869 	case AF_INET:
870 		addr_len = sizeof(struct in_addr);
871 		break;
872 	case AF_INET6:
873 		addr_len = sizeof(struct in6_addr);
874 		break;
875 	default:
876 		return false;
877 	}
878 	*min_len += addr_len;
879 	if (len < *min_len)
880 		return false;
881 
882 	/* Check prefix length (in bits) vs address length (in bytes). */
883 	if (cond->prefix_len > 8 * addr_len)
884 		return false;
885 
886 	return true;
887 }
888 
889 /* Validate a port comparison operator. */
890 static bool valid_port_comparison(const struct inet_diag_bc_op *op,
891 				  int len, int *min_len)
892 {
893 	/* Port comparisons put the port in a follow-on inet_diag_bc_op. */
894 	*min_len += sizeof(struct inet_diag_bc_op);
895 	if (len < *min_len)
896 		return false;
897 	return true;
898 }
899 
900 static bool valid_markcond(const struct inet_diag_bc_op *op, int len,
901 			   int *min_len)
902 {
903 	*min_len += sizeof(struct inet_diag_markcond);
904 	return len >= *min_len;
905 }
906 
907 #ifdef CONFIG_SOCK_CGROUP_DATA
908 static bool valid_cgroupcond(const struct inet_diag_bc_op *op, int len,
909 			     int *min_len)
910 {
911 	*min_len += sizeof(u64);
912 	return len >= *min_len;
913 }
914 #endif
915 
916 static int inet_diag_bc_audit(const struct nlattr *attr,
917 			      const struct sk_buff *skb)
918 {
919 	bool net_admin = netlink_net_capable(skb, CAP_NET_ADMIN);
920 	const void *bytecode, *bc;
921 	int bytecode_len, len;
922 
923 	if (!attr || nla_len(attr) < sizeof(struct inet_diag_bc_op))
924 		return -EINVAL;
925 
926 	bytecode = bc = nla_data(attr);
927 	len = bytecode_len = nla_len(attr);
928 
929 	while (len > 0) {
930 		int min_len = sizeof(struct inet_diag_bc_op);
931 		const struct inet_diag_bc_op *op = bc;
932 
933 		switch (op->code) {
934 		case INET_DIAG_BC_S_COND:
935 		case INET_DIAG_BC_D_COND:
936 			if (!valid_hostcond(bc, len, &min_len))
937 				return -EINVAL;
938 			break;
939 		case INET_DIAG_BC_DEV_COND:
940 			if (!valid_devcond(bc, len, &min_len))
941 				return -EINVAL;
942 			break;
943 		case INET_DIAG_BC_S_EQ:
944 		case INET_DIAG_BC_S_GE:
945 		case INET_DIAG_BC_S_LE:
946 		case INET_DIAG_BC_D_EQ:
947 		case INET_DIAG_BC_D_GE:
948 		case INET_DIAG_BC_D_LE:
949 			if (!valid_port_comparison(bc, len, &min_len))
950 				return -EINVAL;
951 			break;
952 		case INET_DIAG_BC_MARK_COND:
953 			if (!net_admin)
954 				return -EPERM;
955 			if (!valid_markcond(bc, len, &min_len))
956 				return -EINVAL;
957 			break;
958 #ifdef CONFIG_SOCK_CGROUP_DATA
959 		case INET_DIAG_BC_CGROUP_COND:
960 			if (!valid_cgroupcond(bc, len, &min_len))
961 				return -EINVAL;
962 			break;
963 #endif
964 		case INET_DIAG_BC_AUTO:
965 		case INET_DIAG_BC_JMP:
966 		case INET_DIAG_BC_NOP:
967 			break;
968 		default:
969 			return -EINVAL;
970 		}
971 
972 		if (op->code != INET_DIAG_BC_NOP) {
973 			if (op->no < min_len || op->no > len + 4 || op->no & 3)
974 				return -EINVAL;
975 			if (op->no < len &&
976 			    !valid_cc(bytecode, bytecode_len, len - op->no))
977 				return -EINVAL;
978 		}
979 
980 		if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
981 			return -EINVAL;
982 		bc  += op->yes;
983 		len -= op->yes;
984 	}
985 	return len == 0 ? 0 : -EINVAL;
986 }
987 
988 static void twsk_build_assert(void)
989 {
990 	BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) !=
991 		     offsetof(struct sock, sk_family));
992 
993 	BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) !=
994 		     offsetof(struct inet_sock, inet_num));
995 
996 	BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) !=
997 		     offsetof(struct inet_sock, inet_dport));
998 
999 	BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) !=
1000 		     offsetof(struct inet_sock, inet_rcv_saddr));
1001 
1002 	BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) !=
1003 		     offsetof(struct inet_sock, inet_daddr));
1004 
1005 #if IS_ENABLED(CONFIG_IPV6)
1006 	BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) !=
1007 		     offsetof(struct sock, sk_v6_rcv_saddr));
1008 
1009 	BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) !=
1010 		     offsetof(struct sock, sk_v6_daddr));
1011 #endif
1012 }
1013 
1014 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
1015 			 struct netlink_callback *cb,
1016 			 const struct inet_diag_req_v2 *r)
1017 {
1018 	bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
1019 	struct inet_diag_dump_data *cb_data = cb->data;
1020 	struct net *net = sock_net(skb->sk);
1021 	u32 idiag_states = r->idiag_states;
1022 	int i, num, s_i, s_num;
1023 	struct nlattr *bc;
1024 	struct sock *sk;
1025 
1026 	bc = cb_data->inet_diag_nla_bc;
1027 	if (idiag_states & TCPF_SYN_RECV)
1028 		idiag_states |= TCPF_NEW_SYN_RECV;
1029 	s_i = cb->args[1];
1030 	s_num = num = cb->args[2];
1031 
1032 	if (cb->args[0] == 0) {
1033 		if (!(idiag_states & TCPF_LISTEN) || r->id.idiag_dport)
1034 			goto skip_listen_ht;
1035 
1036 		for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
1037 			struct inet_listen_hashbucket *ilb;
1038 			struct hlist_nulls_node *node;
1039 
1040 			num = 0;
1041 			ilb = &hashinfo->listening_hash[i];
1042 			spin_lock(&ilb->lock);
1043 			sk_nulls_for_each(sk, node, &ilb->nulls_head) {
1044 				struct inet_sock *inet = inet_sk(sk);
1045 
1046 				if (!net_eq(sock_net(sk), net))
1047 					continue;
1048 
1049 				if (num < s_num) {
1050 					num++;
1051 					continue;
1052 				}
1053 
1054 				if (r->sdiag_family != AF_UNSPEC &&
1055 				    sk->sk_family != r->sdiag_family)
1056 					goto next_listen;
1057 
1058 				if (r->id.idiag_sport != inet->inet_sport &&
1059 				    r->id.idiag_sport)
1060 					goto next_listen;
1061 
1062 				if (!inet_diag_bc_sk(bc, sk))
1063 					goto next_listen;
1064 
1065 				if (inet_sk_diag_fill(sk, inet_csk(sk), skb,
1066 						      cb, r, NLM_F_MULTI,
1067 						      net_admin) < 0) {
1068 					spin_unlock(&ilb->lock);
1069 					goto done;
1070 				}
1071 
1072 next_listen:
1073 				++num;
1074 			}
1075 			spin_unlock(&ilb->lock);
1076 
1077 			s_num = 0;
1078 		}
1079 skip_listen_ht:
1080 		cb->args[0] = 1;
1081 		s_i = num = s_num = 0;
1082 	}
1083 
1084 	if (!(idiag_states & ~TCPF_LISTEN))
1085 		goto out;
1086 
1087 #define SKARR_SZ 16
1088 	for (i = s_i; i <= hashinfo->ehash_mask; i++) {
1089 		struct inet_ehash_bucket *head = &hashinfo->ehash[i];
1090 		spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
1091 		struct hlist_nulls_node *node;
1092 		struct sock *sk_arr[SKARR_SZ];
1093 		int num_arr[SKARR_SZ];
1094 		int idx, accum, res;
1095 
1096 		if (hlist_nulls_empty(&head->chain))
1097 			continue;
1098 
1099 		if (i > s_i)
1100 			s_num = 0;
1101 
1102 next_chunk:
1103 		num = 0;
1104 		accum = 0;
1105 		spin_lock_bh(lock);
1106 		sk_nulls_for_each(sk, node, &head->chain) {
1107 			int state;
1108 
1109 			if (!net_eq(sock_net(sk), net))
1110 				continue;
1111 			if (num < s_num)
1112 				goto next_normal;
1113 			state = (sk->sk_state == TCP_TIME_WAIT) ?
1114 				inet_twsk(sk)->tw_substate : sk->sk_state;
1115 			if (!(idiag_states & (1 << state)))
1116 				goto next_normal;
1117 			if (r->sdiag_family != AF_UNSPEC &&
1118 			    sk->sk_family != r->sdiag_family)
1119 				goto next_normal;
1120 			if (r->id.idiag_sport != htons(sk->sk_num) &&
1121 			    r->id.idiag_sport)
1122 				goto next_normal;
1123 			if (r->id.idiag_dport != sk->sk_dport &&
1124 			    r->id.idiag_dport)
1125 				goto next_normal;
1126 			twsk_build_assert();
1127 
1128 			if (!inet_diag_bc_sk(bc, sk))
1129 				goto next_normal;
1130 
1131 			if (!refcount_inc_not_zero(&sk->sk_refcnt))
1132 				goto next_normal;
1133 
1134 			num_arr[accum] = num;
1135 			sk_arr[accum] = sk;
1136 			if (++accum == SKARR_SZ)
1137 				break;
1138 next_normal:
1139 			++num;
1140 		}
1141 		spin_unlock_bh(lock);
1142 		res = 0;
1143 		for (idx = 0; idx < accum; idx++) {
1144 			if (res >= 0) {
1145 				res = sk_diag_fill(sk_arr[idx], skb, cb, r,
1146 						   NLM_F_MULTI, net_admin);
1147 				if (res < 0)
1148 					num = num_arr[idx];
1149 			}
1150 			sock_gen_put(sk_arr[idx]);
1151 		}
1152 		if (res < 0)
1153 			break;
1154 		cond_resched();
1155 		if (accum == SKARR_SZ) {
1156 			s_num = num + 1;
1157 			goto next_chunk;
1158 		}
1159 	}
1160 
1161 done:
1162 	cb->args[1] = i;
1163 	cb->args[2] = num;
1164 out:
1165 	;
1166 }
1167 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
1168 
1169 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
1170 			    const struct inet_diag_req_v2 *r)
1171 {
1172 	struct inet_diag_dump_data *cb_data = cb->data;
1173 	const struct inet_diag_handler *handler;
1174 	u32 prev_min_dump_alloc;
1175 	int protocol, err = 0;
1176 
1177 	protocol = inet_diag_get_protocol(r, cb_data);
1178 
1179 again:
1180 	prev_min_dump_alloc = cb->min_dump_alloc;
1181 	handler = inet_diag_lock_handler(protocol);
1182 	if (!IS_ERR(handler))
1183 		handler->dump(skb, cb, r);
1184 	else
1185 		err = PTR_ERR(handler);
1186 	inet_diag_unlock_handler(handler);
1187 
1188 	/* The skb is not large enough to fit one sk info and
1189 	 * inet_sk_diag_fill() has requested for a larger skb.
1190 	 */
1191 	if (!skb->len && cb->min_dump_alloc > prev_min_dump_alloc) {
1192 		err = pskb_expand_head(skb, 0, cb->min_dump_alloc, GFP_KERNEL);
1193 		if (!err)
1194 			goto again;
1195 	}
1196 
1197 	return err ? : skb->len;
1198 }
1199 
1200 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
1201 {
1202 	return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh));
1203 }
1204 
1205 static int __inet_diag_dump_start(struct netlink_callback *cb, int hdrlen)
1206 {
1207 	const struct nlmsghdr *nlh = cb->nlh;
1208 	struct inet_diag_dump_data *cb_data;
1209 	struct sk_buff *skb = cb->skb;
1210 	struct nlattr *nla;
1211 	int err;
1212 
1213 	cb_data = kzalloc(sizeof(*cb_data), GFP_KERNEL);
1214 	if (!cb_data)
1215 		return -ENOMEM;
1216 
1217 	err = inet_diag_parse_attrs(nlh, hdrlen, cb_data->req_nlas);
1218 	if (err) {
1219 		kfree(cb_data);
1220 		return err;
1221 	}
1222 	nla = cb_data->inet_diag_nla_bc;
1223 	if (nla) {
1224 		err = inet_diag_bc_audit(nla, skb);
1225 		if (err) {
1226 			kfree(cb_data);
1227 			return err;
1228 		}
1229 	}
1230 
1231 	nla = cb_data->inet_diag_nla_bpf_stgs;
1232 	if (nla) {
1233 		struct bpf_sk_storage_diag *bpf_stg_diag;
1234 
1235 		bpf_stg_diag = bpf_sk_storage_diag_alloc(nla);
1236 		if (IS_ERR(bpf_stg_diag)) {
1237 			kfree(cb_data);
1238 			return PTR_ERR(bpf_stg_diag);
1239 		}
1240 		cb_data->bpf_stg_diag = bpf_stg_diag;
1241 	}
1242 
1243 	cb->data = cb_data;
1244 	return 0;
1245 }
1246 
1247 static int inet_diag_dump_start(struct netlink_callback *cb)
1248 {
1249 	return __inet_diag_dump_start(cb, sizeof(struct inet_diag_req_v2));
1250 }
1251 
1252 static int inet_diag_dump_start_compat(struct netlink_callback *cb)
1253 {
1254 	return __inet_diag_dump_start(cb, sizeof(struct inet_diag_req));
1255 }
1256 
1257 static int inet_diag_dump_done(struct netlink_callback *cb)
1258 {
1259 	struct inet_diag_dump_data *cb_data = cb->data;
1260 
1261 	bpf_sk_storage_diag_free(cb_data->bpf_stg_diag);
1262 	kfree(cb->data);
1263 
1264 	return 0;
1265 }
1266 
1267 static int inet_diag_type2proto(int type)
1268 {
1269 	switch (type) {
1270 	case TCPDIAG_GETSOCK:
1271 		return IPPROTO_TCP;
1272 	case DCCPDIAG_GETSOCK:
1273 		return IPPROTO_DCCP;
1274 	default:
1275 		return 0;
1276 	}
1277 }
1278 
1279 static int inet_diag_dump_compat(struct sk_buff *skb,
1280 				 struct netlink_callback *cb)
1281 {
1282 	struct inet_diag_req *rc = nlmsg_data(cb->nlh);
1283 	struct inet_diag_req_v2 req;
1284 
1285 	req.sdiag_family = AF_UNSPEC; /* compatibility */
1286 	req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
1287 	req.idiag_ext = rc->idiag_ext;
1288 	req.idiag_states = rc->idiag_states;
1289 	req.id = rc->id;
1290 
1291 	return __inet_diag_dump(skb, cb, &req);
1292 }
1293 
1294 static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
1295 				      const struct nlmsghdr *nlh)
1296 {
1297 	struct inet_diag_req *rc = nlmsg_data(nlh);
1298 	struct inet_diag_req_v2 req;
1299 
1300 	req.sdiag_family = rc->idiag_family;
1301 	req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
1302 	req.idiag_ext = rc->idiag_ext;
1303 	req.idiag_states = rc->idiag_states;
1304 	req.id = rc->id;
1305 
1306 	return inet_diag_cmd_exact(SOCK_DIAG_BY_FAMILY, in_skb, nlh,
1307 				   sizeof(struct inet_diag_req), &req);
1308 }
1309 
1310 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
1311 {
1312 	int hdrlen = sizeof(struct inet_diag_req);
1313 	struct net *net = sock_net(skb->sk);
1314 
1315 	if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
1316 	    nlmsg_len(nlh) < hdrlen)
1317 		return -EINVAL;
1318 
1319 	if (nlh->nlmsg_flags & NLM_F_DUMP) {
1320 		struct netlink_dump_control c = {
1321 			.start = inet_diag_dump_start_compat,
1322 			.done = inet_diag_dump_done,
1323 			.dump = inet_diag_dump_compat,
1324 		};
1325 		return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
1326 	}
1327 
1328 	return inet_diag_get_exact_compat(skb, nlh);
1329 }
1330 
1331 static int inet_diag_handler_cmd(struct sk_buff *skb, struct nlmsghdr *h)
1332 {
1333 	int hdrlen = sizeof(struct inet_diag_req_v2);
1334 	struct net *net = sock_net(skb->sk);
1335 
1336 	if (nlmsg_len(h) < hdrlen)
1337 		return -EINVAL;
1338 
1339 	if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
1340 	    h->nlmsg_flags & NLM_F_DUMP) {
1341 		struct netlink_dump_control c = {
1342 			.start = inet_diag_dump_start,
1343 			.done = inet_diag_dump_done,
1344 			.dump = inet_diag_dump,
1345 		};
1346 		return netlink_dump_start(net->diag_nlsk, skb, h, &c);
1347 	}
1348 
1349 	return inet_diag_cmd_exact(h->nlmsg_type, skb, h, hdrlen,
1350 				   nlmsg_data(h));
1351 }
1352 
1353 static
1354 int inet_diag_handler_get_info(struct sk_buff *skb, struct sock *sk)
1355 {
1356 	const struct inet_diag_handler *handler;
1357 	struct nlmsghdr *nlh;
1358 	struct nlattr *attr;
1359 	struct inet_diag_msg *r;
1360 	void *info = NULL;
1361 	int err = 0;
1362 
1363 	nlh = nlmsg_put(skb, 0, 0, SOCK_DIAG_BY_FAMILY, sizeof(*r), 0);
1364 	if (!nlh)
1365 		return -ENOMEM;
1366 
1367 	r = nlmsg_data(nlh);
1368 	memset(r, 0, sizeof(*r));
1369 	inet_diag_msg_common_fill(r, sk);
1370 	if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_STREAM)
1371 		r->id.idiag_sport = inet_sk(sk)->inet_sport;
1372 	r->idiag_state = sk->sk_state;
1373 
1374 	if ((err = nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))) {
1375 		nlmsg_cancel(skb, nlh);
1376 		return err;
1377 	}
1378 
1379 	handler = inet_diag_lock_handler(sk->sk_protocol);
1380 	if (IS_ERR(handler)) {
1381 		inet_diag_unlock_handler(handler);
1382 		nlmsg_cancel(skb, nlh);
1383 		return PTR_ERR(handler);
1384 	}
1385 
1386 	attr = handler->idiag_info_size
1387 		? nla_reserve_64bit(skb, INET_DIAG_INFO,
1388 				    handler->idiag_info_size,
1389 				    INET_DIAG_PAD)
1390 		: NULL;
1391 	if (attr)
1392 		info = nla_data(attr);
1393 
1394 	handler->idiag_get_info(sk, r, info);
1395 	inet_diag_unlock_handler(handler);
1396 
1397 	nlmsg_end(skb, nlh);
1398 	return 0;
1399 }
1400 
1401 static const struct sock_diag_handler inet_diag_handler = {
1402 	.family = AF_INET,
1403 	.dump = inet_diag_handler_cmd,
1404 	.get_info = inet_diag_handler_get_info,
1405 	.destroy = inet_diag_handler_cmd,
1406 };
1407 
1408 static const struct sock_diag_handler inet6_diag_handler = {
1409 	.family = AF_INET6,
1410 	.dump = inet_diag_handler_cmd,
1411 	.get_info = inet_diag_handler_get_info,
1412 	.destroy = inet_diag_handler_cmd,
1413 };
1414 
1415 int inet_diag_register(const struct inet_diag_handler *h)
1416 {
1417 	const __u16 type = h->idiag_type;
1418 	int err = -EINVAL;
1419 
1420 	if (type >= IPPROTO_MAX)
1421 		goto out;
1422 
1423 	mutex_lock(&inet_diag_table_mutex);
1424 	err = -EEXIST;
1425 	if (!inet_diag_table[type]) {
1426 		inet_diag_table[type] = h;
1427 		err = 0;
1428 	}
1429 	mutex_unlock(&inet_diag_table_mutex);
1430 out:
1431 	return err;
1432 }
1433 EXPORT_SYMBOL_GPL(inet_diag_register);
1434 
1435 void inet_diag_unregister(const struct inet_diag_handler *h)
1436 {
1437 	const __u16 type = h->idiag_type;
1438 
1439 	if (type >= IPPROTO_MAX)
1440 		return;
1441 
1442 	mutex_lock(&inet_diag_table_mutex);
1443 	inet_diag_table[type] = NULL;
1444 	mutex_unlock(&inet_diag_table_mutex);
1445 }
1446 EXPORT_SYMBOL_GPL(inet_diag_unregister);
1447 
1448 static int __init inet_diag_init(void)
1449 {
1450 	const int inet_diag_table_size = (IPPROTO_MAX *
1451 					  sizeof(struct inet_diag_handler *));
1452 	int err = -ENOMEM;
1453 
1454 	inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1455 	if (!inet_diag_table)
1456 		goto out;
1457 
1458 	err = sock_diag_register(&inet_diag_handler);
1459 	if (err)
1460 		goto out_free_nl;
1461 
1462 	err = sock_diag_register(&inet6_diag_handler);
1463 	if (err)
1464 		goto out_free_inet;
1465 
1466 	sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1467 out:
1468 	return err;
1469 
1470 out_free_inet:
1471 	sock_diag_unregister(&inet_diag_handler);
1472 out_free_nl:
1473 	kfree(inet_diag_table);
1474 	goto out;
1475 }
1476 
1477 static void __exit inet_diag_exit(void)
1478 {
1479 	sock_diag_unregister(&inet6_diag_handler);
1480 	sock_diag_unregister(&inet_diag_handler);
1481 	sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1482 	kfree(inet_diag_table);
1483 }
1484 
1485 module_init(inet_diag_init);
1486 module_exit(inet_diag_exit);
1487 MODULE_LICENSE("GPL");
1488 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1489 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);
1490