xref: /openbmc/linux/net/ipv4/inet_diag.c (revision 4f3db074) 
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 };
48 
49 static DEFINE_MUTEX(inet_diag_table_mutex);
50 
51 static const struct inet_diag_handler *inet_diag_lock_handler(int proto)
52 {
53 	if (!inet_diag_table[proto])
54 		request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK,
55 			       NETLINK_SOCK_DIAG, AF_INET, proto);
56 
57 	mutex_lock(&inet_diag_table_mutex);
58 	if (!inet_diag_table[proto])
59 		return ERR_PTR(-ENOENT);
60 
61 	return inet_diag_table[proto];
62 }
63 
64 static void inet_diag_unlock_handler(const struct inet_diag_handler *handler)
65 {
66 	mutex_unlock(&inet_diag_table_mutex);
67 }
68 
69 static void inet_diag_msg_common_fill(struct inet_diag_msg *r, struct sock *sk)
70 {
71 	r->idiag_family = sk->sk_family;
72 
73 	r->id.idiag_sport = htons(sk->sk_num);
74 	r->id.idiag_dport = sk->sk_dport;
75 	r->id.idiag_if = sk->sk_bound_dev_if;
76 	sock_diag_save_cookie(sk, r->id.idiag_cookie);
77 
78 #if IS_ENABLED(CONFIG_IPV6)
79 	if (sk->sk_family == AF_INET6) {
80 		*(struct in6_addr *)r->id.idiag_src = sk->sk_v6_rcv_saddr;
81 		*(struct in6_addr *)r->id.idiag_dst = sk->sk_v6_daddr;
82 	} else
83 #endif
84 	{
85 	memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
86 	memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
87 
88 	r->id.idiag_src[0] = sk->sk_rcv_saddr;
89 	r->id.idiag_dst[0] = sk->sk_daddr;
90 	}
91 }
92 
93 static size_t inet_sk_attr_size(void)
94 {
95 	return	  nla_total_size(sizeof(struct tcp_info))
96 		+ nla_total_size(1) /* INET_DIAG_SHUTDOWN */
97 		+ nla_total_size(1) /* INET_DIAG_TOS */
98 		+ nla_total_size(1) /* INET_DIAG_TCLASS */
99 		+ nla_total_size(sizeof(struct inet_diag_meminfo))
100 		+ nla_total_size(sizeof(struct inet_diag_msg))
101 		+ nla_total_size(SK_MEMINFO_VARS * sizeof(u32))
102 		+ nla_total_size(TCP_CA_NAME_MAX)
103 		+ nla_total_size(sizeof(struct tcpvegas_info))
104 		+ 64;
105 }
106 
107 int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
108 		      struct sk_buff *skb, const struct inet_diag_req_v2 *req,
109 		      struct user_namespace *user_ns,
110 		      u32 portid, u32 seq, u16 nlmsg_flags,
111 		      const struct nlmsghdr *unlh)
112 {
113 	const struct inet_sock *inet = inet_sk(sk);
114 	const struct tcp_congestion_ops *ca_ops;
115 	const struct inet_diag_handler *handler;
116 	int ext = req->idiag_ext;
117 	struct inet_diag_msg *r;
118 	struct nlmsghdr  *nlh;
119 	struct nlattr *attr;
120 	void *info = NULL;
121 
122 	handler = inet_diag_table[req->sdiag_protocol];
123 	BUG_ON(!handler);
124 
125 	nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
126 			nlmsg_flags);
127 	if (!nlh)
128 		return -EMSGSIZE;
129 
130 	r = nlmsg_data(nlh);
131 	BUG_ON(!sk_fullsock(sk));
132 
133 	inet_diag_msg_common_fill(r, sk);
134 	r->idiag_state = sk->sk_state;
135 	r->idiag_timer = 0;
136 	r->idiag_retrans = 0;
137 
138 	if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown))
139 		goto errout;
140 
141 	/* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
142 	 * hence this needs to be included regardless of socket family.
143 	 */
144 	if (ext & (1 << (INET_DIAG_TOS - 1)))
145 		if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0)
146 			goto errout;
147 
148 #if IS_ENABLED(CONFIG_IPV6)
149 	if (r->idiag_family == AF_INET6) {
150 		if (ext & (1 << (INET_DIAG_TCLASS - 1)))
151 			if (nla_put_u8(skb, INET_DIAG_TCLASS,
152 				       inet6_sk(sk)->tclass) < 0)
153 				goto errout;
154 	}
155 #endif
156 
157 	r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
158 	r->idiag_inode = sock_i_ino(sk);
159 
160 	if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
161 		struct inet_diag_meminfo minfo = {
162 			.idiag_rmem = sk_rmem_alloc_get(sk),
163 			.idiag_wmem = sk->sk_wmem_queued,
164 			.idiag_fmem = sk->sk_forward_alloc,
165 			.idiag_tmem = sk_wmem_alloc_get(sk),
166 		};
167 
168 		if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
169 			goto errout;
170 	}
171 
172 	if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
173 		if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
174 			goto errout;
175 
176 	if (!icsk) {
177 		handler->idiag_get_info(sk, r, NULL);
178 		goto out;
179 	}
180 
181 #define EXPIRES_IN_MS(tmo)  DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
182 
183 	if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
184 	    icsk->icsk_pending == ICSK_TIME_EARLY_RETRANS ||
185 	    icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
186 		r->idiag_timer = 1;
187 		r->idiag_retrans = icsk->icsk_retransmits;
188 		r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
189 	} else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
190 		r->idiag_timer = 4;
191 		r->idiag_retrans = icsk->icsk_probes_out;
192 		r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
193 	} else if (timer_pending(&sk->sk_timer)) {
194 		r->idiag_timer = 2;
195 		r->idiag_retrans = icsk->icsk_probes_out;
196 		r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
197 	} else {
198 		r->idiag_timer = 0;
199 		r->idiag_expires = 0;
200 	}
201 #undef EXPIRES_IN_MS
202 
203 	if (ext & (1 << (INET_DIAG_INFO - 1))) {
204 		attr = nla_reserve(skb, INET_DIAG_INFO,
205 				   sizeof(struct tcp_info));
206 		if (!attr)
207 			goto errout;
208 
209 		info = nla_data(attr);
210 	}
211 
212 	if (ext & (1 << (INET_DIAG_CONG - 1))) {
213 		int err = 0;
214 
215 		rcu_read_lock();
216 		ca_ops = READ_ONCE(icsk->icsk_ca_ops);
217 		if (ca_ops)
218 			err = nla_put_string(skb, INET_DIAG_CONG, ca_ops->name);
219 		rcu_read_unlock();
220 		if (err < 0)
221 			goto errout;
222 	}
223 
224 	handler->idiag_get_info(sk, r, info);
225 
226 	if (sk->sk_state < TCP_TIME_WAIT) {
227 		int err = 0;
228 
229 		rcu_read_lock();
230 		ca_ops = READ_ONCE(icsk->icsk_ca_ops);
231 		if (ca_ops && ca_ops->get_info)
232 			err = ca_ops->get_info(sk, ext, skb);
233 		rcu_read_unlock();
234 		if (err < 0)
235 			goto errout;
236 	}
237 
238 out:
239 	nlmsg_end(skb, nlh);
240 	return 0;
241 
242 errout:
243 	nlmsg_cancel(skb, nlh);
244 	return -EMSGSIZE;
245 }
246 EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
247 
248 static int inet_csk_diag_fill(struct sock *sk,
249 			      struct sk_buff *skb,
250 			      const struct inet_diag_req_v2 *req,
251 			      struct user_namespace *user_ns,
252 			      u32 portid, u32 seq, u16 nlmsg_flags,
253 			      const struct nlmsghdr *unlh)
254 {
255 	return inet_sk_diag_fill(sk, inet_csk(sk), skb, req,
256 				 user_ns, portid, seq, nlmsg_flags, unlh);
257 }
258 
259 static int inet_twsk_diag_fill(struct sock *sk,
260 			       struct sk_buff *skb,
261 			       u32 portid, u32 seq, u16 nlmsg_flags,
262 			       const struct nlmsghdr *unlh)
263 {
264 	struct inet_timewait_sock *tw = inet_twsk(sk);
265 	struct inet_diag_msg *r;
266 	struct nlmsghdr *nlh;
267 	long tmo;
268 
269 	nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
270 			nlmsg_flags);
271 	if (!nlh)
272 		return -EMSGSIZE;
273 
274 	r = nlmsg_data(nlh);
275 	BUG_ON(tw->tw_state != TCP_TIME_WAIT);
276 
277 	tmo = tw->tw_timer.expires - jiffies;
278 	if (tmo < 0)
279 		tmo = 0;
280 
281 	inet_diag_msg_common_fill(r, sk);
282 	r->idiag_retrans      = 0;
283 
284 	r->idiag_state	      = tw->tw_substate;
285 	r->idiag_timer	      = 3;
286 	r->idiag_expires      = jiffies_to_msecs(tmo);
287 	r->idiag_rqueue	      = 0;
288 	r->idiag_wqueue	      = 0;
289 	r->idiag_uid	      = 0;
290 	r->idiag_inode	      = 0;
291 
292 	nlmsg_end(skb, nlh);
293 	return 0;
294 }
295 
296 static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb,
297 			      u32 portid, u32 seq, u16 nlmsg_flags,
298 			      const struct nlmsghdr *unlh)
299 {
300 	struct inet_diag_msg *r;
301 	struct nlmsghdr *nlh;
302 	long tmo;
303 
304 	nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
305 			nlmsg_flags);
306 	if (!nlh)
307 		return -EMSGSIZE;
308 
309 	r = nlmsg_data(nlh);
310 	inet_diag_msg_common_fill(r, sk);
311 	r->idiag_state = TCP_SYN_RECV;
312 	r->idiag_timer = 1;
313 	r->idiag_retrans = inet_reqsk(sk)->num_retrans;
314 
315 	BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) !=
316 		     offsetof(struct sock, sk_cookie));
317 
318 	tmo = inet_reqsk(sk)->rsk_timer.expires - jiffies;
319 	r->idiag_expires = (tmo >= 0) ? jiffies_to_msecs(tmo) : 0;
320 	r->idiag_rqueue	= 0;
321 	r->idiag_wqueue	= 0;
322 	r->idiag_uid	= 0;
323 	r->idiag_inode	= 0;
324 
325 	nlmsg_end(skb, nlh);
326 	return 0;
327 }
328 
329 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
330 			const struct inet_diag_req_v2 *r,
331 			struct user_namespace *user_ns,
332 			u32 portid, u32 seq, u16 nlmsg_flags,
333 			const struct nlmsghdr *unlh)
334 {
335 	if (sk->sk_state == TCP_TIME_WAIT)
336 		return inet_twsk_diag_fill(sk, skb, portid, seq,
337 					   nlmsg_flags, unlh);
338 
339 	if (sk->sk_state == TCP_NEW_SYN_RECV)
340 		return inet_req_diag_fill(sk, skb, portid, seq,
341 					  nlmsg_flags, unlh);
342 
343 	return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq,
344 				  nlmsg_flags, unlh);
345 }
346 
347 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo,
348 			    struct sk_buff *in_skb,
349 			    const struct nlmsghdr *nlh,
350 			    const struct inet_diag_req_v2 *req)
351 {
352 	struct net *net = sock_net(in_skb->sk);
353 	struct sk_buff *rep;
354 	struct sock *sk;
355 	int err;
356 
357 	err = -EINVAL;
358 	if (req->sdiag_family == AF_INET)
359 		sk = inet_lookup(net, hashinfo, req->id.idiag_dst[0],
360 				 req->id.idiag_dport, req->id.idiag_src[0],
361 				 req->id.idiag_sport, req->id.idiag_if);
362 #if IS_ENABLED(CONFIG_IPV6)
363 	else if (req->sdiag_family == AF_INET6)
364 		sk = inet6_lookup(net, hashinfo,
365 				  (struct in6_addr *)req->id.idiag_dst,
366 				  req->id.idiag_dport,
367 				  (struct in6_addr *)req->id.idiag_src,
368 				  req->id.idiag_sport,
369 				  req->id.idiag_if);
370 #endif
371 	else
372 		goto out_nosk;
373 
374 	err = -ENOENT;
375 	if (!sk)
376 		goto out_nosk;
377 
378 	err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
379 	if (err)
380 		goto out;
381 
382 	rep = nlmsg_new(inet_sk_attr_size(), GFP_KERNEL);
383 	if (!rep) {
384 		err = -ENOMEM;
385 		goto out;
386 	}
387 
388 	err = sk_diag_fill(sk, rep, req,
389 			   sk_user_ns(NETLINK_CB(in_skb).sk),
390 			   NETLINK_CB(in_skb).portid,
391 			   nlh->nlmsg_seq, 0, nlh);
392 	if (err < 0) {
393 		WARN_ON(err == -EMSGSIZE);
394 		nlmsg_free(rep);
395 		goto out;
396 	}
397 	err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
398 			      MSG_DONTWAIT);
399 	if (err > 0)
400 		err = 0;
401 
402 out:
403 	if (sk)
404 		sock_gen_put(sk);
405 
406 out_nosk:
407 	return err;
408 }
409 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
410 
411 static int inet_diag_get_exact(struct sk_buff *in_skb,
412 			       const struct nlmsghdr *nlh,
413 			       const struct inet_diag_req_v2 *req)
414 {
415 	const struct inet_diag_handler *handler;
416 	int err;
417 
418 	handler = inet_diag_lock_handler(req->sdiag_protocol);
419 	if (IS_ERR(handler))
420 		err = PTR_ERR(handler);
421 	else
422 		err = handler->dump_one(in_skb, nlh, req);
423 	inet_diag_unlock_handler(handler);
424 
425 	return err;
426 }
427 
428 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
429 {
430 	int words = bits >> 5;
431 
432 	bits &= 0x1f;
433 
434 	if (words) {
435 		if (memcmp(a1, a2, words << 2))
436 			return 0;
437 	}
438 	if (bits) {
439 		__be32 w1, w2;
440 		__be32 mask;
441 
442 		w1 = a1[words];
443 		w2 = a2[words];
444 
445 		mask = htonl((0xffffffff) << (32 - bits));
446 
447 		if ((w1 ^ w2) & mask)
448 			return 0;
449 	}
450 
451 	return 1;
452 }
453 
454 static int inet_diag_bc_run(const struct nlattr *_bc,
455 			    const struct inet_diag_entry *entry)
456 {
457 	const void *bc = nla_data(_bc);
458 	int len = nla_len(_bc);
459 
460 	while (len > 0) {
461 		int yes = 1;
462 		const struct inet_diag_bc_op *op = bc;
463 
464 		switch (op->code) {
465 		case INET_DIAG_BC_NOP:
466 			break;
467 		case INET_DIAG_BC_JMP:
468 			yes = 0;
469 			break;
470 		case INET_DIAG_BC_S_GE:
471 			yes = entry->sport >= op[1].no;
472 			break;
473 		case INET_DIAG_BC_S_LE:
474 			yes = entry->sport <= op[1].no;
475 			break;
476 		case INET_DIAG_BC_D_GE:
477 			yes = entry->dport >= op[1].no;
478 			break;
479 		case INET_DIAG_BC_D_LE:
480 			yes = entry->dport <= op[1].no;
481 			break;
482 		case INET_DIAG_BC_AUTO:
483 			yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
484 			break;
485 		case INET_DIAG_BC_S_COND:
486 		case INET_DIAG_BC_D_COND: {
487 			const struct inet_diag_hostcond *cond;
488 			const __be32 *addr;
489 
490 			cond = (const struct inet_diag_hostcond *)(op + 1);
491 			if (cond->port != -1 &&
492 			    cond->port != (op->code == INET_DIAG_BC_S_COND ?
493 					     entry->sport : entry->dport)) {
494 				yes = 0;
495 				break;
496 			}
497 
498 			if (op->code == INET_DIAG_BC_S_COND)
499 				addr = entry->saddr;
500 			else
501 				addr = entry->daddr;
502 
503 			if (cond->family != AF_UNSPEC &&
504 			    cond->family != entry->family) {
505 				if (entry->family == AF_INET6 &&
506 				    cond->family == AF_INET) {
507 					if (addr[0] == 0 && addr[1] == 0 &&
508 					    addr[2] == htonl(0xffff) &&
509 					    bitstring_match(addr + 3,
510 							    cond->addr,
511 							    cond->prefix_len))
512 						break;
513 				}
514 				yes = 0;
515 				break;
516 			}
517 
518 			if (cond->prefix_len == 0)
519 				break;
520 			if (bitstring_match(addr, cond->addr,
521 					    cond->prefix_len))
522 				break;
523 			yes = 0;
524 			break;
525 		}
526 		}
527 
528 		if (yes) {
529 			len -= op->yes;
530 			bc += op->yes;
531 		} else {
532 			len -= op->no;
533 			bc += op->no;
534 		}
535 	}
536 	return len == 0;
537 }
538 
539 /* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV)
540  */
541 static void entry_fill_addrs(struct inet_diag_entry *entry,
542 			     const struct sock *sk)
543 {
544 #if IS_ENABLED(CONFIG_IPV6)
545 	if (sk->sk_family == AF_INET6) {
546 		entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32;
547 		entry->daddr = sk->sk_v6_daddr.s6_addr32;
548 	} else
549 #endif
550 	{
551 		entry->saddr = &sk->sk_rcv_saddr;
552 		entry->daddr = &sk->sk_daddr;
553 	}
554 }
555 
556 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
557 {
558 	struct inet_sock *inet = inet_sk(sk);
559 	struct inet_diag_entry entry;
560 
561 	if (!bc)
562 		return 1;
563 
564 	entry.family = sk->sk_family;
565 	entry_fill_addrs(&entry, sk);
566 	entry.sport = inet->inet_num;
567 	entry.dport = ntohs(inet->inet_dport);
568 	entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0;
569 
570 	return inet_diag_bc_run(bc, &entry);
571 }
572 EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
573 
574 static int valid_cc(const void *bc, int len, int cc)
575 {
576 	while (len >= 0) {
577 		const struct inet_diag_bc_op *op = bc;
578 
579 		if (cc > len)
580 			return 0;
581 		if (cc == len)
582 			return 1;
583 		if (op->yes < 4 || op->yes & 3)
584 			return 0;
585 		len -= op->yes;
586 		bc  += op->yes;
587 	}
588 	return 0;
589 }
590 
591 /* Validate an inet_diag_hostcond. */
592 static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
593 			   int *min_len)
594 {
595 	struct inet_diag_hostcond *cond;
596 	int addr_len;
597 
598 	/* Check hostcond space. */
599 	*min_len += sizeof(struct inet_diag_hostcond);
600 	if (len < *min_len)
601 		return false;
602 	cond = (struct inet_diag_hostcond *)(op + 1);
603 
604 	/* Check address family and address length. */
605 	switch (cond->family) {
606 	case AF_UNSPEC:
607 		addr_len = 0;
608 		break;
609 	case AF_INET:
610 		addr_len = sizeof(struct in_addr);
611 		break;
612 	case AF_INET6:
613 		addr_len = sizeof(struct in6_addr);
614 		break;
615 	default:
616 		return false;
617 	}
618 	*min_len += addr_len;
619 	if (len < *min_len)
620 		return false;
621 
622 	/* Check prefix length (in bits) vs address length (in bytes). */
623 	if (cond->prefix_len > 8 * addr_len)
624 		return false;
625 
626 	return true;
627 }
628 
629 /* Validate a port comparison operator. */
630 static bool valid_port_comparison(const struct inet_diag_bc_op *op,
631 				  int len, int *min_len)
632 {
633 	/* Port comparisons put the port in a follow-on inet_diag_bc_op. */
634 	*min_len += sizeof(struct inet_diag_bc_op);
635 	if (len < *min_len)
636 		return false;
637 	return true;
638 }
639 
640 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
641 {
642 	const void *bc = bytecode;
643 	int  len = bytecode_len;
644 
645 	while (len > 0) {
646 		int min_len = sizeof(struct inet_diag_bc_op);
647 		const struct inet_diag_bc_op *op = bc;
648 
649 		switch (op->code) {
650 		case INET_DIAG_BC_S_COND:
651 		case INET_DIAG_BC_D_COND:
652 			if (!valid_hostcond(bc, len, &min_len))
653 				return -EINVAL;
654 			break;
655 		case INET_DIAG_BC_S_GE:
656 		case INET_DIAG_BC_S_LE:
657 		case INET_DIAG_BC_D_GE:
658 		case INET_DIAG_BC_D_LE:
659 			if (!valid_port_comparison(bc, len, &min_len))
660 				return -EINVAL;
661 			break;
662 		case INET_DIAG_BC_AUTO:
663 		case INET_DIAG_BC_JMP:
664 		case INET_DIAG_BC_NOP:
665 			break;
666 		default:
667 			return -EINVAL;
668 		}
669 
670 		if (op->code != INET_DIAG_BC_NOP) {
671 			if (op->no < min_len || op->no > len + 4 || op->no & 3)
672 				return -EINVAL;
673 			if (op->no < len &&
674 			    !valid_cc(bytecode, bytecode_len, len - op->no))
675 				return -EINVAL;
676 		}
677 
678 		if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
679 			return -EINVAL;
680 		bc  += op->yes;
681 		len -= op->yes;
682 	}
683 	return len == 0 ? 0 : -EINVAL;
684 }
685 
686 static int inet_csk_diag_dump(struct sock *sk,
687 			      struct sk_buff *skb,
688 			      struct netlink_callback *cb,
689 			      const struct inet_diag_req_v2 *r,
690 			      const struct nlattr *bc)
691 {
692 	if (!inet_diag_bc_sk(bc, sk))
693 		return 0;
694 
695 	return inet_csk_diag_fill(sk, skb, r,
696 				  sk_user_ns(NETLINK_CB(cb->skb).sk),
697 				  NETLINK_CB(cb->skb).portid,
698 				  cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
699 }
700 
701 static void twsk_build_assert(void)
702 {
703 	BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) !=
704 		     offsetof(struct sock, sk_family));
705 
706 	BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) !=
707 		     offsetof(struct inet_sock, inet_num));
708 
709 	BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) !=
710 		     offsetof(struct inet_sock, inet_dport));
711 
712 	BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) !=
713 		     offsetof(struct inet_sock, inet_rcv_saddr));
714 
715 	BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) !=
716 		     offsetof(struct inet_sock, inet_daddr));
717 
718 #if IS_ENABLED(CONFIG_IPV6)
719 	BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) !=
720 		     offsetof(struct sock, sk_v6_rcv_saddr));
721 
722 	BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) !=
723 		     offsetof(struct sock, sk_v6_daddr));
724 #endif
725 }
726 
727 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
728 			       struct netlink_callback *cb,
729 			       const struct inet_diag_req_v2 *r,
730 			       const struct nlattr *bc)
731 {
732 	struct inet_connection_sock *icsk = inet_csk(sk);
733 	struct inet_sock *inet = inet_sk(sk);
734 	struct inet_diag_entry entry;
735 	int j, s_j, reqnum, s_reqnum;
736 	struct listen_sock *lopt;
737 	int err = 0;
738 
739 	s_j = cb->args[3];
740 	s_reqnum = cb->args[4];
741 
742 	if (s_j > 0)
743 		s_j--;
744 
745 	entry.family = sk->sk_family;
746 
747 	spin_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
748 
749 	lopt = icsk->icsk_accept_queue.listen_opt;
750 	if (!lopt || !listen_sock_qlen(lopt))
751 		goto out;
752 
753 	if (bc) {
754 		entry.sport = inet->inet_num;
755 		entry.userlocks = sk->sk_userlocks;
756 	}
757 
758 	for (j = s_j; j < lopt->nr_table_entries; j++) {
759 		struct request_sock *req, *head = lopt->syn_table[j];
760 
761 		reqnum = 0;
762 		for (req = head; req; reqnum++, req = req->dl_next) {
763 			struct inet_request_sock *ireq = inet_rsk(req);
764 
765 			if (reqnum < s_reqnum)
766 				continue;
767 			if (r->id.idiag_dport != ireq->ir_rmt_port &&
768 			    r->id.idiag_dport)
769 				continue;
770 
771 			if (bc) {
772 				/* Note: entry.sport and entry.userlocks are already set */
773 				entry_fill_addrs(&entry, req_to_sk(req));
774 				entry.dport = ntohs(ireq->ir_rmt_port);
775 
776 				if (!inet_diag_bc_run(bc, &entry))
777 					continue;
778 			}
779 
780 			err = inet_req_diag_fill(req_to_sk(req), skb,
781 						 NETLINK_CB(cb->skb).portid,
782 						 cb->nlh->nlmsg_seq,
783 						 NLM_F_MULTI, cb->nlh);
784 			if (err < 0) {
785 				cb->args[3] = j + 1;
786 				cb->args[4] = reqnum;
787 				goto out;
788 			}
789 		}
790 
791 		s_reqnum = 0;
792 	}
793 
794 out:
795 	spin_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
796 
797 	return err;
798 }
799 
800 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
801 			 struct netlink_callback *cb,
802 			 const struct inet_diag_req_v2 *r, struct nlattr *bc)
803 {
804 	struct net *net = sock_net(skb->sk);
805 	int i, num, s_i, s_num;
806 
807 	s_i = cb->args[1];
808 	s_num = num = cb->args[2];
809 
810 	if (cb->args[0] == 0) {
811 		if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
812 			goto skip_listen_ht;
813 
814 		for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
815 			struct inet_listen_hashbucket *ilb;
816 			struct hlist_nulls_node *node;
817 			struct sock *sk;
818 
819 			num = 0;
820 			ilb = &hashinfo->listening_hash[i];
821 			spin_lock_bh(&ilb->lock);
822 			sk_nulls_for_each(sk, node, &ilb->head) {
823 				struct inet_sock *inet = inet_sk(sk);
824 
825 				if (!net_eq(sock_net(sk), net))
826 					continue;
827 
828 				if (num < s_num) {
829 					num++;
830 					continue;
831 				}
832 
833 				if (r->sdiag_family != AF_UNSPEC &&
834 				    sk->sk_family != r->sdiag_family)
835 					goto next_listen;
836 
837 				if (r->id.idiag_sport != inet->inet_sport &&
838 				    r->id.idiag_sport)
839 					goto next_listen;
840 
841 				if (!(r->idiag_states & TCPF_LISTEN) ||
842 				    r->id.idiag_dport ||
843 				    cb->args[3] > 0)
844 					goto syn_recv;
845 
846 				if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
847 					spin_unlock_bh(&ilb->lock);
848 					goto done;
849 				}
850 
851 syn_recv:
852 				if (!(r->idiag_states & TCPF_SYN_RECV))
853 					goto next_listen;
854 
855 				if (inet_diag_dump_reqs(skb, sk, cb, r, bc) < 0) {
856 					spin_unlock_bh(&ilb->lock);
857 					goto done;
858 				}
859 
860 next_listen:
861 				cb->args[3] = 0;
862 				cb->args[4] = 0;
863 				++num;
864 			}
865 			spin_unlock_bh(&ilb->lock);
866 
867 			s_num = 0;
868 			cb->args[3] = 0;
869 			cb->args[4] = 0;
870 		}
871 skip_listen_ht:
872 		cb->args[0] = 1;
873 		s_i = num = s_num = 0;
874 	}
875 
876 	if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
877 		goto out;
878 
879 	for (i = s_i; i <= hashinfo->ehash_mask; i++) {
880 		struct inet_ehash_bucket *head = &hashinfo->ehash[i];
881 		spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
882 		struct hlist_nulls_node *node;
883 		struct sock *sk;
884 
885 		num = 0;
886 
887 		if (hlist_nulls_empty(&head->chain))
888 			continue;
889 
890 		if (i > s_i)
891 			s_num = 0;
892 
893 		spin_lock_bh(lock);
894 		sk_nulls_for_each(sk, node, &head->chain) {
895 			int state, res;
896 
897 			if (!net_eq(sock_net(sk), net))
898 				continue;
899 			if (num < s_num)
900 				goto next_normal;
901 			state = (sk->sk_state == TCP_TIME_WAIT) ?
902 				inet_twsk(sk)->tw_substate : sk->sk_state;
903 			if (!(r->idiag_states & (1 << state)))
904 				goto next_normal;
905 			if (r->sdiag_family != AF_UNSPEC &&
906 			    sk->sk_family != r->sdiag_family)
907 				goto next_normal;
908 			if (r->id.idiag_sport != htons(sk->sk_num) &&
909 			    r->id.idiag_sport)
910 				goto next_normal;
911 			if (r->id.idiag_dport != sk->sk_dport &&
912 			    r->id.idiag_dport)
913 				goto next_normal;
914 			twsk_build_assert();
915 
916 			if (!inet_diag_bc_sk(bc, sk))
917 				goto next_normal;
918 
919 			res = sk_diag_fill(sk, skb, r,
920 					   sk_user_ns(NETLINK_CB(cb->skb).sk),
921 					   NETLINK_CB(cb->skb).portid,
922 					   cb->nlh->nlmsg_seq, NLM_F_MULTI,
923 					   cb->nlh);
924 			if (res < 0) {
925 				spin_unlock_bh(lock);
926 				goto done;
927 			}
928 next_normal:
929 			++num;
930 		}
931 
932 		spin_unlock_bh(lock);
933 	}
934 
935 done:
936 	cb->args[1] = i;
937 	cb->args[2] = num;
938 out:
939 	;
940 }
941 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
942 
943 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
944 			    const struct inet_diag_req_v2 *r,
945 			    struct nlattr *bc)
946 {
947 	const struct inet_diag_handler *handler;
948 	int err = 0;
949 
950 	handler = inet_diag_lock_handler(r->sdiag_protocol);
951 	if (!IS_ERR(handler))
952 		handler->dump(skb, cb, r, bc);
953 	else
954 		err = PTR_ERR(handler);
955 	inet_diag_unlock_handler(handler);
956 
957 	return err ? : skb->len;
958 }
959 
960 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
961 {
962 	int hdrlen = sizeof(struct inet_diag_req_v2);
963 	struct nlattr *bc = NULL;
964 
965 	if (nlmsg_attrlen(cb->nlh, hdrlen))
966 		bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
967 
968 	return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
969 }
970 
971 static int inet_diag_type2proto(int type)
972 {
973 	switch (type) {
974 	case TCPDIAG_GETSOCK:
975 		return IPPROTO_TCP;
976 	case DCCPDIAG_GETSOCK:
977 		return IPPROTO_DCCP;
978 	default:
979 		return 0;
980 	}
981 }
982 
983 static int inet_diag_dump_compat(struct sk_buff *skb,
984 				 struct netlink_callback *cb)
985 {
986 	struct inet_diag_req *rc = nlmsg_data(cb->nlh);
987 	int hdrlen = sizeof(struct inet_diag_req);
988 	struct inet_diag_req_v2 req;
989 	struct nlattr *bc = NULL;
990 
991 	req.sdiag_family = AF_UNSPEC; /* compatibility */
992 	req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
993 	req.idiag_ext = rc->idiag_ext;
994 	req.idiag_states = rc->idiag_states;
995 	req.id = rc->id;
996 
997 	if (nlmsg_attrlen(cb->nlh, hdrlen))
998 		bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
999 
1000 	return __inet_diag_dump(skb, cb, &req, bc);
1001 }
1002 
1003 static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
1004 				      const struct nlmsghdr *nlh)
1005 {
1006 	struct inet_diag_req *rc = nlmsg_data(nlh);
1007 	struct inet_diag_req_v2 req;
1008 
1009 	req.sdiag_family = rc->idiag_family;
1010 	req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
1011 	req.idiag_ext = rc->idiag_ext;
1012 	req.idiag_states = rc->idiag_states;
1013 	req.id = rc->id;
1014 
1015 	return inet_diag_get_exact(in_skb, nlh, &req);
1016 }
1017 
1018 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
1019 {
1020 	int hdrlen = sizeof(struct inet_diag_req);
1021 	struct net *net = sock_net(skb->sk);
1022 
1023 	if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
1024 	    nlmsg_len(nlh) < hdrlen)
1025 		return -EINVAL;
1026 
1027 	if (nlh->nlmsg_flags & NLM_F_DUMP) {
1028 		if (nlmsg_attrlen(nlh, hdrlen)) {
1029 			struct nlattr *attr;
1030 
1031 			attr = nlmsg_find_attr(nlh, hdrlen,
1032 					       INET_DIAG_REQ_BYTECODE);
1033 			if (!attr ||
1034 			    nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
1035 			    inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
1036 				return -EINVAL;
1037 		}
1038 		{
1039 			struct netlink_dump_control c = {
1040 				.dump = inet_diag_dump_compat,
1041 			};
1042 			return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
1043 		}
1044 	}
1045 
1046 	return inet_diag_get_exact_compat(skb, nlh);
1047 }
1048 
1049 static int inet_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
1050 {
1051 	int hdrlen = sizeof(struct inet_diag_req_v2);
1052 	struct net *net = sock_net(skb->sk);
1053 
1054 	if (nlmsg_len(h) < hdrlen)
1055 		return -EINVAL;
1056 
1057 	if (h->nlmsg_flags & NLM_F_DUMP) {
1058 		if (nlmsg_attrlen(h, hdrlen)) {
1059 			struct nlattr *attr;
1060 
1061 			attr = nlmsg_find_attr(h, hdrlen,
1062 					       INET_DIAG_REQ_BYTECODE);
1063 			if (!attr ||
1064 			    nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
1065 			    inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
1066 				return -EINVAL;
1067 		}
1068 		{
1069 			struct netlink_dump_control c = {
1070 				.dump = inet_diag_dump,
1071 			};
1072 			return netlink_dump_start(net->diag_nlsk, skb, h, &c);
1073 		}
1074 	}
1075 
1076 	return inet_diag_get_exact(skb, h, nlmsg_data(h));
1077 }
1078 
1079 static const struct sock_diag_handler inet_diag_handler = {
1080 	.family = AF_INET,
1081 	.dump = inet_diag_handler_dump,
1082 };
1083 
1084 static const struct sock_diag_handler inet6_diag_handler = {
1085 	.family = AF_INET6,
1086 	.dump = inet_diag_handler_dump,
1087 };
1088 
1089 int inet_diag_register(const struct inet_diag_handler *h)
1090 {
1091 	const __u16 type = h->idiag_type;
1092 	int err = -EINVAL;
1093 
1094 	if (type >= IPPROTO_MAX)
1095 		goto out;
1096 
1097 	mutex_lock(&inet_diag_table_mutex);
1098 	err = -EEXIST;
1099 	if (!inet_diag_table[type]) {
1100 		inet_diag_table[type] = h;
1101 		err = 0;
1102 	}
1103 	mutex_unlock(&inet_diag_table_mutex);
1104 out:
1105 	return err;
1106 }
1107 EXPORT_SYMBOL_GPL(inet_diag_register);
1108 
1109 void inet_diag_unregister(const struct inet_diag_handler *h)
1110 {
1111 	const __u16 type = h->idiag_type;
1112 
1113 	if (type >= IPPROTO_MAX)
1114 		return;
1115 
1116 	mutex_lock(&inet_diag_table_mutex);
1117 	inet_diag_table[type] = NULL;
1118 	mutex_unlock(&inet_diag_table_mutex);
1119 }
1120 EXPORT_SYMBOL_GPL(inet_diag_unregister);
1121 
1122 static int __init inet_diag_init(void)
1123 {
1124 	const int inet_diag_table_size = (IPPROTO_MAX *
1125 					  sizeof(struct inet_diag_handler *));
1126 	int err = -ENOMEM;
1127 
1128 	inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1129 	if (!inet_diag_table)
1130 		goto out;
1131 
1132 	err = sock_diag_register(&inet_diag_handler);
1133 	if (err)
1134 		goto out_free_nl;
1135 
1136 	err = sock_diag_register(&inet6_diag_handler);
1137 	if (err)
1138 		goto out_free_inet;
1139 
1140 	sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1141 out:
1142 	return err;
1143 
1144 out_free_inet:
1145 	sock_diag_unregister(&inet_diag_handler);
1146 out_free_nl:
1147 	kfree(inet_diag_table);
1148 	goto out;
1149 }
1150 
1151 static void __exit inet_diag_exit(void)
1152 {
1153 	sock_diag_unregister(&inet6_diag_handler);
1154 	sock_diag_unregister(&inet_diag_handler);
1155 	sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1156 	kfree(inet_diag_table);
1157 }
1158 
1159 module_init(inet_diag_init);
1160 module_exit(inet_diag_exit);
1161 MODULE_LICENSE("GPL");
1162 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1163 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);
1164