xref: /openbmc/linux/net/ipv4/inet_diag.c (revision d106352d9f527fe336749ad89de7e07e5af91a68)
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 	__be32 *saddr;
42 	__be32 *daddr;
43 	u16 sport;
44 	u16 dport;
45 	u16 family;
46 	u16 userlocks;
47 };
48 
49 #define INET_DIAG_PUT(skb, attrtype, attrlen) \
50 	RTA_DATA(__RTA_PUT(skb, attrtype, attrlen))
51 
52 static DEFINE_MUTEX(inet_diag_table_mutex);
53 
54 static const struct inet_diag_handler *inet_diag_lock_handler(int proto)
55 {
56 	if (!inet_diag_table[proto])
57 		request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK,
58 			       NETLINK_SOCK_DIAG, AF_INET, proto);
59 
60 	mutex_lock(&inet_diag_table_mutex);
61 	if (!inet_diag_table[proto])
62 		return ERR_PTR(-ENOENT);
63 
64 	return inet_diag_table[proto];
65 }
66 
67 static inline void inet_diag_unlock_handler(
68 	const struct inet_diag_handler *handler)
69 {
70 	mutex_unlock(&inet_diag_table_mutex);
71 }
72 
73 int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
74 			      struct sk_buff *skb, struct inet_diag_req_v2 *req,
75 			      u32 pid, u32 seq, u16 nlmsg_flags,
76 			      const struct nlmsghdr *unlh)
77 {
78 	const struct inet_sock *inet = inet_sk(sk);
79 	struct inet_diag_msg *r;
80 	struct nlmsghdr  *nlh;
81 	void *info = NULL;
82 	struct inet_diag_meminfo  *minfo = NULL;
83 	unsigned char	 *b = skb_tail_pointer(skb);
84 	const struct inet_diag_handler *handler;
85 	int ext = req->idiag_ext;
86 
87 	handler = inet_diag_table[req->sdiag_protocol];
88 	BUG_ON(handler == NULL);
89 
90 	nlh = nlmsg_put(skb, pid, seq, unlh->nlmsg_type, sizeof(*r), 0);
91 	if (!nlh) {
92 		nlmsg_trim(skb, b);
93 		return -EMSGSIZE;
94 	}
95 	nlh->nlmsg_flags = nlmsg_flags;
96 
97 	r = nlmsg_data(nlh);
98 	BUG_ON(sk->sk_state == TCP_TIME_WAIT);
99 
100 	if (ext & (1 << (INET_DIAG_MEMINFO - 1)))
101 		minfo = INET_DIAG_PUT(skb, INET_DIAG_MEMINFO, sizeof(*minfo));
102 
103 	r->idiag_family = sk->sk_family;
104 	r->idiag_state = sk->sk_state;
105 	r->idiag_timer = 0;
106 	r->idiag_retrans = 0;
107 
108 	r->id.idiag_if = sk->sk_bound_dev_if;
109 	sock_diag_save_cookie(sk, r->id.idiag_cookie);
110 
111 	r->id.idiag_sport = inet->inet_sport;
112 	r->id.idiag_dport = inet->inet_dport;
113 	r->id.idiag_src[0] = inet->inet_rcv_saddr;
114 	r->id.idiag_dst[0] = inet->inet_daddr;
115 
116 	/* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
117 	 * hence this needs to be included regardless of socket family.
118 	 */
119 	if (ext & (1 << (INET_DIAG_TOS - 1)))
120 		RTA_PUT_U8(skb, INET_DIAG_TOS, inet->tos);
121 
122 #if IS_ENABLED(CONFIG_IPV6)
123 	if (r->idiag_family == AF_INET6) {
124 		const struct ipv6_pinfo *np = inet6_sk(sk);
125 
126 		*(struct in6_addr *)r->id.idiag_src = np->rcv_saddr;
127 		*(struct in6_addr *)r->id.idiag_dst = np->daddr;
128 		if (ext & (1 << (INET_DIAG_TCLASS - 1)))
129 			RTA_PUT_U8(skb, INET_DIAG_TCLASS, np->tclass);
130 	}
131 #endif
132 
133 	r->idiag_uid = sock_i_uid(sk);
134 	r->idiag_inode = sock_i_ino(sk);
135 
136 	if (minfo) {
137 		minfo->idiag_rmem = sk_rmem_alloc_get(sk);
138 		minfo->idiag_wmem = sk->sk_wmem_queued;
139 		minfo->idiag_fmem = sk->sk_forward_alloc;
140 		minfo->idiag_tmem = sk_wmem_alloc_get(sk);
141 	}
142 
143 	if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
144 		if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
145 			goto rtattr_failure;
146 
147 	if (icsk == NULL) {
148 		handler->idiag_get_info(sk, r, NULL);
149 		goto out;
150 	}
151 
152 #define EXPIRES_IN_MS(tmo)  DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
153 
154 	if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
155 		r->idiag_timer = 1;
156 		r->idiag_retrans = icsk->icsk_retransmits;
157 		r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
158 	} else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
159 		r->idiag_timer = 4;
160 		r->idiag_retrans = icsk->icsk_probes_out;
161 		r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
162 	} else if (timer_pending(&sk->sk_timer)) {
163 		r->idiag_timer = 2;
164 		r->idiag_retrans = icsk->icsk_probes_out;
165 		r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
166 	} else {
167 		r->idiag_timer = 0;
168 		r->idiag_expires = 0;
169 	}
170 #undef EXPIRES_IN_MS
171 
172 	if (ext & (1 << (INET_DIAG_INFO - 1)))
173 		info = INET_DIAG_PUT(skb, INET_DIAG_INFO, sizeof(struct tcp_info));
174 
175 	if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops) {
176 		const size_t len = strlen(icsk->icsk_ca_ops->name);
177 
178 		strcpy(INET_DIAG_PUT(skb, INET_DIAG_CONG, len + 1),
179 		       icsk->icsk_ca_ops->name);
180 	}
181 
182 	handler->idiag_get_info(sk, r, info);
183 
184 	if (sk->sk_state < TCP_TIME_WAIT &&
185 	    icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
186 		icsk->icsk_ca_ops->get_info(sk, ext, skb);
187 
188 out:
189 	nlh->nlmsg_len = skb_tail_pointer(skb) - b;
190 	return skb->len;
191 
192 rtattr_failure:
193 	nlmsg_trim(skb, b);
194 	return -EMSGSIZE;
195 }
196 EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
197 
198 static int inet_csk_diag_fill(struct sock *sk,
199 			      struct sk_buff *skb, struct inet_diag_req_v2 *req,
200 			      u32 pid, u32 seq, u16 nlmsg_flags,
201 			      const struct nlmsghdr *unlh)
202 {
203 	return inet_sk_diag_fill(sk, inet_csk(sk),
204 			skb, req, pid, seq, nlmsg_flags, unlh);
205 }
206 
207 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw,
208 			       struct sk_buff *skb, struct inet_diag_req_v2 *req,
209 			       u32 pid, u32 seq, u16 nlmsg_flags,
210 			       const struct nlmsghdr *unlh)
211 {
212 	long tmo;
213 	struct inet_diag_msg *r;
214 	const unsigned char *previous_tail = skb_tail_pointer(skb);
215 	struct nlmsghdr *nlh = nlmsg_put(skb, pid, seq,
216 					 unlh->nlmsg_type, sizeof(*r), 0);
217 
218 	if (!nlh) {
219 		nlmsg_trim(skb, previous_tail);
220 		return -EMSGSIZE;
221 	}
222 
223 	r = nlmsg_data(nlh);
224 	BUG_ON(tw->tw_state != TCP_TIME_WAIT);
225 
226 	nlh->nlmsg_flags = nlmsg_flags;
227 
228 	tmo = tw->tw_ttd - jiffies;
229 	if (tmo < 0)
230 		tmo = 0;
231 
232 	r->idiag_family	      = tw->tw_family;
233 	r->idiag_retrans      = 0;
234 	r->id.idiag_if	      = tw->tw_bound_dev_if;
235 	sock_diag_save_cookie(tw, r->id.idiag_cookie);
236 	r->id.idiag_sport     = tw->tw_sport;
237 	r->id.idiag_dport     = tw->tw_dport;
238 	r->id.idiag_src[0]    = tw->tw_rcv_saddr;
239 	r->id.idiag_dst[0]    = tw->tw_daddr;
240 	r->idiag_state	      = tw->tw_substate;
241 	r->idiag_timer	      = 3;
242 	r->idiag_expires      = DIV_ROUND_UP(tmo * 1000, HZ);
243 	r->idiag_rqueue	      = 0;
244 	r->idiag_wqueue	      = 0;
245 	r->idiag_uid	      = 0;
246 	r->idiag_inode	      = 0;
247 #if IS_ENABLED(CONFIG_IPV6)
248 	if (tw->tw_family == AF_INET6) {
249 		const struct inet6_timewait_sock *tw6 =
250 						inet6_twsk((struct sock *)tw);
251 
252 		*(struct in6_addr *)r->id.idiag_src = tw6->tw_v6_rcv_saddr;
253 		*(struct in6_addr *)r->id.idiag_dst = tw6->tw_v6_daddr;
254 	}
255 #endif
256 	nlh->nlmsg_len = skb_tail_pointer(skb) - previous_tail;
257 	return skb->len;
258 }
259 
260 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
261 			struct inet_diag_req_v2 *r, u32 pid, u32 seq, u16 nlmsg_flags,
262 			const struct nlmsghdr *unlh)
263 {
264 	if (sk->sk_state == TCP_TIME_WAIT)
265 		return inet_twsk_diag_fill((struct inet_timewait_sock *)sk,
266 					   skb, r, pid, seq, nlmsg_flags,
267 					   unlh);
268 	return inet_csk_diag_fill(sk, skb, r, pid, seq, nlmsg_flags, unlh);
269 }
270 
271 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *in_skb,
272 		const struct nlmsghdr *nlh, struct inet_diag_req_v2 *req)
273 {
274 	int err;
275 	struct sock *sk;
276 	struct sk_buff *rep;
277 
278 	err = -EINVAL;
279 	if (req->sdiag_family == AF_INET) {
280 		sk = inet_lookup(&init_net, hashinfo, req->id.idiag_dst[0],
281 				 req->id.idiag_dport, req->id.idiag_src[0],
282 				 req->id.idiag_sport, req->id.idiag_if);
283 	}
284 #if IS_ENABLED(CONFIG_IPV6)
285 	else if (req->sdiag_family == AF_INET6) {
286 		sk = inet6_lookup(&init_net, hashinfo,
287 				  (struct in6_addr *)req->id.idiag_dst,
288 				  req->id.idiag_dport,
289 				  (struct in6_addr *)req->id.idiag_src,
290 				  req->id.idiag_sport,
291 				  req->id.idiag_if);
292 	}
293 #endif
294 	else {
295 		goto out_nosk;
296 	}
297 
298 	err = -ENOENT;
299 	if (sk == NULL)
300 		goto out_nosk;
301 
302 	err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
303 	if (err)
304 		goto out;
305 
306 	err = -ENOMEM;
307 	rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) +
308 				     sizeof(struct inet_diag_meminfo) +
309 				     sizeof(struct tcp_info) + 64)),
310 			GFP_KERNEL);
311 	if (!rep)
312 		goto out;
313 
314 	err = sk_diag_fill(sk, rep, req,
315 			   NETLINK_CB(in_skb).pid,
316 			   nlh->nlmsg_seq, 0, nlh);
317 	if (err < 0) {
318 		WARN_ON(err == -EMSGSIZE);
319 		kfree_skb(rep);
320 		goto out;
321 	}
322 	err = netlink_unicast(sock_diag_nlsk, rep, NETLINK_CB(in_skb).pid,
323 			      MSG_DONTWAIT);
324 	if (err > 0)
325 		err = 0;
326 
327 out:
328 	if (sk) {
329 		if (sk->sk_state == TCP_TIME_WAIT)
330 			inet_twsk_put((struct inet_timewait_sock *)sk);
331 		else
332 			sock_put(sk);
333 	}
334 out_nosk:
335 	return err;
336 }
337 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
338 
339 static int inet_diag_get_exact(struct sk_buff *in_skb,
340 			       const struct nlmsghdr *nlh,
341 			       struct inet_diag_req_v2 *req)
342 {
343 	const struct inet_diag_handler *handler;
344 	int err;
345 
346 	handler = inet_diag_lock_handler(req->sdiag_protocol);
347 	if (IS_ERR(handler))
348 		err = PTR_ERR(handler);
349 	else
350 		err = handler->dump_one(in_skb, nlh, req);
351 	inet_diag_unlock_handler(handler);
352 
353 	return err;
354 }
355 
356 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
357 {
358 	int words = bits >> 5;
359 
360 	bits &= 0x1f;
361 
362 	if (words) {
363 		if (memcmp(a1, a2, words << 2))
364 			return 0;
365 	}
366 	if (bits) {
367 		__be32 w1, w2;
368 		__be32 mask;
369 
370 		w1 = a1[words];
371 		w2 = a2[words];
372 
373 		mask = htonl((0xffffffff) << (32 - bits));
374 
375 		if ((w1 ^ w2) & mask)
376 			return 0;
377 	}
378 
379 	return 1;
380 }
381 
382 
383 static int inet_diag_bc_run(const struct nlattr *_bc,
384 		const struct inet_diag_entry *entry)
385 {
386 	const void *bc = nla_data(_bc);
387 	int len = nla_len(_bc);
388 
389 	while (len > 0) {
390 		int yes = 1;
391 		const struct inet_diag_bc_op *op = bc;
392 
393 		switch (op->code) {
394 		case INET_DIAG_BC_NOP:
395 			break;
396 		case INET_DIAG_BC_JMP:
397 			yes = 0;
398 			break;
399 		case INET_DIAG_BC_S_GE:
400 			yes = entry->sport >= op[1].no;
401 			break;
402 		case INET_DIAG_BC_S_LE:
403 			yes = entry->sport <= op[1].no;
404 			break;
405 		case INET_DIAG_BC_D_GE:
406 			yes = entry->dport >= op[1].no;
407 			break;
408 		case INET_DIAG_BC_D_LE:
409 			yes = entry->dport <= op[1].no;
410 			break;
411 		case INET_DIAG_BC_AUTO:
412 			yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
413 			break;
414 		case INET_DIAG_BC_S_COND:
415 		case INET_DIAG_BC_D_COND: {
416 			struct inet_diag_hostcond *cond;
417 			__be32 *addr;
418 
419 			cond = (struct inet_diag_hostcond *)(op + 1);
420 			if (cond->port != -1 &&
421 			    cond->port != (op->code == INET_DIAG_BC_S_COND ?
422 					     entry->sport : entry->dport)) {
423 				yes = 0;
424 				break;
425 			}
426 
427 			if (cond->prefix_len == 0)
428 				break;
429 
430 			if (op->code == INET_DIAG_BC_S_COND)
431 				addr = entry->saddr;
432 			else
433 				addr = entry->daddr;
434 
435 			if (bitstring_match(addr, cond->addr,
436 					    cond->prefix_len))
437 				break;
438 			if (entry->family == AF_INET6 &&
439 			    cond->family == AF_INET) {
440 				if (addr[0] == 0 && addr[1] == 0 &&
441 				    addr[2] == htonl(0xffff) &&
442 				    bitstring_match(addr + 3, cond->addr,
443 						    cond->prefix_len))
444 					break;
445 			}
446 			yes = 0;
447 			break;
448 		}
449 		}
450 
451 		if (yes) {
452 			len -= op->yes;
453 			bc += op->yes;
454 		} else {
455 			len -= op->no;
456 			bc += op->no;
457 		}
458 	}
459 	return len == 0;
460 }
461 
462 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
463 {
464 	struct inet_diag_entry entry;
465 	struct inet_sock *inet = inet_sk(sk);
466 
467 	if (bc == NULL)
468 		return 1;
469 
470 	entry.family = sk->sk_family;
471 #if IS_ENABLED(CONFIG_IPV6)
472 	if (entry.family == AF_INET6) {
473 		struct ipv6_pinfo *np = inet6_sk(sk);
474 
475 		entry.saddr = np->rcv_saddr.s6_addr32;
476 		entry.daddr = np->daddr.s6_addr32;
477 	} else
478 #endif
479 	{
480 		entry.saddr = &inet->inet_rcv_saddr;
481 		entry.daddr = &inet->inet_daddr;
482 	}
483 	entry.sport = inet->inet_num;
484 	entry.dport = ntohs(inet->inet_dport);
485 	entry.userlocks = sk->sk_userlocks;
486 
487 	return inet_diag_bc_run(bc, &entry);
488 }
489 EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
490 
491 static int valid_cc(const void *bc, int len, int cc)
492 {
493 	while (len >= 0) {
494 		const struct inet_diag_bc_op *op = bc;
495 
496 		if (cc > len)
497 			return 0;
498 		if (cc == len)
499 			return 1;
500 		if (op->yes < 4 || op->yes & 3)
501 			return 0;
502 		len -= op->yes;
503 		bc  += op->yes;
504 	}
505 	return 0;
506 }
507 
508 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
509 {
510 	const void *bc = bytecode;
511 	int  len = bytecode_len;
512 
513 	while (len > 0) {
514 		const struct inet_diag_bc_op *op = bc;
515 
516 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
517 		switch (op->code) {
518 		case INET_DIAG_BC_AUTO:
519 		case INET_DIAG_BC_S_COND:
520 		case INET_DIAG_BC_D_COND:
521 		case INET_DIAG_BC_S_GE:
522 		case INET_DIAG_BC_S_LE:
523 		case INET_DIAG_BC_D_GE:
524 		case INET_DIAG_BC_D_LE:
525 		case INET_DIAG_BC_JMP:
526 			if (op->no < 4 || op->no > len + 4 || op->no & 3)
527 				return -EINVAL;
528 			if (op->no < len &&
529 			    !valid_cc(bytecode, bytecode_len, len - op->no))
530 				return -EINVAL;
531 			break;
532 		case INET_DIAG_BC_NOP:
533 			break;
534 		default:
535 			return -EINVAL;
536 		}
537 		if (op->yes < 4 || op->yes > len + 4 || op->yes & 3)
538 			return -EINVAL;
539 		bc  += op->yes;
540 		len -= op->yes;
541 	}
542 	return len == 0 ? 0 : -EINVAL;
543 }
544 
545 static int inet_csk_diag_dump(struct sock *sk,
546 			      struct sk_buff *skb,
547 			      struct netlink_callback *cb,
548 			      struct inet_diag_req_v2 *r,
549 			      const struct nlattr *bc)
550 {
551 	if (!inet_diag_bc_sk(bc, sk))
552 		return 0;
553 
554 	return inet_csk_diag_fill(sk, skb, r,
555 				  NETLINK_CB(cb->skb).pid,
556 				  cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
557 }
558 
559 static int inet_twsk_diag_dump(struct inet_timewait_sock *tw,
560 			       struct sk_buff *skb,
561 			       struct netlink_callback *cb,
562 			       struct inet_diag_req_v2 *r,
563 			       const struct nlattr *bc)
564 {
565 	if (bc != NULL) {
566 		struct inet_diag_entry entry;
567 
568 		entry.family = tw->tw_family;
569 #if IS_ENABLED(CONFIG_IPV6)
570 		if (tw->tw_family == AF_INET6) {
571 			struct inet6_timewait_sock *tw6 =
572 						inet6_twsk((struct sock *)tw);
573 			entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32;
574 			entry.daddr = tw6->tw_v6_daddr.s6_addr32;
575 		} else
576 #endif
577 		{
578 			entry.saddr = &tw->tw_rcv_saddr;
579 			entry.daddr = &tw->tw_daddr;
580 		}
581 		entry.sport = tw->tw_num;
582 		entry.dport = ntohs(tw->tw_dport);
583 		entry.userlocks = 0;
584 
585 		if (!inet_diag_bc_run(bc, &entry))
586 			return 0;
587 	}
588 
589 	return inet_twsk_diag_fill(tw, skb, r,
590 				   NETLINK_CB(cb->skb).pid,
591 				   cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
592 }
593 
594 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
595 			      struct request_sock *req, u32 pid, u32 seq,
596 			      const struct nlmsghdr *unlh)
597 {
598 	const struct inet_request_sock *ireq = inet_rsk(req);
599 	struct inet_sock *inet = inet_sk(sk);
600 	unsigned char *b = skb_tail_pointer(skb);
601 	struct inet_diag_msg *r;
602 	struct nlmsghdr *nlh;
603 	long tmo;
604 
605 	nlh = nlmsg_put(skb, pid, seq, unlh->nlmsg_type, sizeof(*r), 0);
606 	if (!nlh) {
607 		nlmsg_trim(skb, b);
608 		return -1;
609 	}
610 	nlh->nlmsg_flags = NLM_F_MULTI;
611 	r = nlmsg_data(nlh);
612 
613 	r->idiag_family = sk->sk_family;
614 	r->idiag_state = TCP_SYN_RECV;
615 	r->idiag_timer = 1;
616 	r->idiag_retrans = req->retrans;
617 
618 	r->id.idiag_if = sk->sk_bound_dev_if;
619 	sock_diag_save_cookie(req, r->id.idiag_cookie);
620 
621 	tmo = req->expires - jiffies;
622 	if (tmo < 0)
623 		tmo = 0;
624 
625 	r->id.idiag_sport = inet->inet_sport;
626 	r->id.idiag_dport = ireq->rmt_port;
627 	r->id.idiag_src[0] = ireq->loc_addr;
628 	r->id.idiag_dst[0] = ireq->rmt_addr;
629 	r->idiag_expires = jiffies_to_msecs(tmo);
630 	r->idiag_rqueue = 0;
631 	r->idiag_wqueue = 0;
632 	r->idiag_uid = sock_i_uid(sk);
633 	r->idiag_inode = 0;
634 #if IS_ENABLED(CONFIG_IPV6)
635 	if (r->idiag_family == AF_INET6) {
636 		*(struct in6_addr *)r->id.idiag_src = inet6_rsk(req)->loc_addr;
637 		*(struct in6_addr *)r->id.idiag_dst = inet6_rsk(req)->rmt_addr;
638 	}
639 #endif
640 	nlh->nlmsg_len = skb_tail_pointer(skb) - b;
641 
642 	return skb->len;
643 }
644 
645 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
646 			       struct netlink_callback *cb,
647 			       struct inet_diag_req_v2 *r,
648 			       const struct nlattr *bc)
649 {
650 	struct inet_diag_entry entry;
651 	struct inet_connection_sock *icsk = inet_csk(sk);
652 	struct listen_sock *lopt;
653 	struct inet_sock *inet = inet_sk(sk);
654 	int j, s_j;
655 	int reqnum, s_reqnum;
656 	int err = 0;
657 
658 	s_j = cb->args[3];
659 	s_reqnum = cb->args[4];
660 
661 	if (s_j > 0)
662 		s_j--;
663 
664 	entry.family = sk->sk_family;
665 
666 	read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
667 
668 	lopt = icsk->icsk_accept_queue.listen_opt;
669 	if (!lopt || !lopt->qlen)
670 		goto out;
671 
672 	if (bc != NULL) {
673 		entry.sport = inet->inet_num;
674 		entry.userlocks = sk->sk_userlocks;
675 	}
676 
677 	for (j = s_j; j < lopt->nr_table_entries; j++) {
678 		struct request_sock *req, *head = lopt->syn_table[j];
679 
680 		reqnum = 0;
681 		for (req = head; req; reqnum++, req = req->dl_next) {
682 			struct inet_request_sock *ireq = inet_rsk(req);
683 
684 			if (reqnum < s_reqnum)
685 				continue;
686 			if (r->id.idiag_dport != ireq->rmt_port &&
687 			    r->id.idiag_dport)
688 				continue;
689 
690 			if (bc) {
691 				entry.saddr =
692 #if IS_ENABLED(CONFIG_IPV6)
693 					(entry.family == AF_INET6) ?
694 					inet6_rsk(req)->loc_addr.s6_addr32 :
695 #endif
696 					&ireq->loc_addr;
697 				entry.daddr =
698 #if IS_ENABLED(CONFIG_IPV6)
699 					(entry.family == AF_INET6) ?
700 					inet6_rsk(req)->rmt_addr.s6_addr32 :
701 #endif
702 					&ireq->rmt_addr;
703 				entry.dport = ntohs(ireq->rmt_port);
704 
705 				if (!inet_diag_bc_run(bc, &entry))
706 					continue;
707 			}
708 
709 			err = inet_diag_fill_req(skb, sk, req,
710 					       NETLINK_CB(cb->skb).pid,
711 					       cb->nlh->nlmsg_seq, cb->nlh);
712 			if (err < 0) {
713 				cb->args[3] = j + 1;
714 				cb->args[4] = reqnum;
715 				goto out;
716 			}
717 		}
718 
719 		s_reqnum = 0;
720 	}
721 
722 out:
723 	read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
724 
725 	return err;
726 }
727 
728 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
729 		struct netlink_callback *cb, struct inet_diag_req_v2 *r, struct nlattr *bc)
730 {
731 	int i, num;
732 	int s_i, s_num;
733 
734 	s_i = cb->args[1];
735 	s_num = num = cb->args[2];
736 
737 	if (cb->args[0] == 0) {
738 		if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
739 			goto skip_listen_ht;
740 
741 		for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
742 			struct sock *sk;
743 			struct hlist_nulls_node *node;
744 			struct inet_listen_hashbucket *ilb;
745 
746 			num = 0;
747 			ilb = &hashinfo->listening_hash[i];
748 			spin_lock_bh(&ilb->lock);
749 			sk_nulls_for_each(sk, node, &ilb->head) {
750 				struct inet_sock *inet = inet_sk(sk);
751 
752 				if (num < s_num) {
753 					num++;
754 					continue;
755 				}
756 
757 				if (r->sdiag_family != AF_UNSPEC &&
758 						sk->sk_family != r->sdiag_family)
759 					goto next_listen;
760 
761 				if (r->id.idiag_sport != inet->inet_sport &&
762 				    r->id.idiag_sport)
763 					goto next_listen;
764 
765 				if (!(r->idiag_states & TCPF_LISTEN) ||
766 				    r->id.idiag_dport ||
767 				    cb->args[3] > 0)
768 					goto syn_recv;
769 
770 				if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
771 					spin_unlock_bh(&ilb->lock);
772 					goto done;
773 				}
774 
775 syn_recv:
776 				if (!(r->idiag_states & TCPF_SYN_RECV))
777 					goto next_listen;
778 
779 				if (inet_diag_dump_reqs(skb, sk, cb, r, bc) < 0) {
780 					spin_unlock_bh(&ilb->lock);
781 					goto done;
782 				}
783 
784 next_listen:
785 				cb->args[3] = 0;
786 				cb->args[4] = 0;
787 				++num;
788 			}
789 			spin_unlock_bh(&ilb->lock);
790 
791 			s_num = 0;
792 			cb->args[3] = 0;
793 			cb->args[4] = 0;
794 		}
795 skip_listen_ht:
796 		cb->args[0] = 1;
797 		s_i = num = s_num = 0;
798 	}
799 
800 	if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
801 		goto out;
802 
803 	for (i = s_i; i <= hashinfo->ehash_mask; i++) {
804 		struct inet_ehash_bucket *head = &hashinfo->ehash[i];
805 		spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
806 		struct sock *sk;
807 		struct hlist_nulls_node *node;
808 
809 		num = 0;
810 
811 		if (hlist_nulls_empty(&head->chain) &&
812 			hlist_nulls_empty(&head->twchain))
813 			continue;
814 
815 		if (i > s_i)
816 			s_num = 0;
817 
818 		spin_lock_bh(lock);
819 		sk_nulls_for_each(sk, node, &head->chain) {
820 			struct inet_sock *inet = inet_sk(sk);
821 
822 			if (num < s_num)
823 				goto next_normal;
824 			if (!(r->idiag_states & (1 << sk->sk_state)))
825 				goto next_normal;
826 			if (r->sdiag_family != AF_UNSPEC &&
827 					sk->sk_family != r->sdiag_family)
828 				goto next_normal;
829 			if (r->id.idiag_sport != inet->inet_sport &&
830 			    r->id.idiag_sport)
831 				goto next_normal;
832 			if (r->id.idiag_dport != inet->inet_dport &&
833 			    r->id.idiag_dport)
834 				goto next_normal;
835 			if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
836 				spin_unlock_bh(lock);
837 				goto done;
838 			}
839 next_normal:
840 			++num;
841 		}
842 
843 		if (r->idiag_states & TCPF_TIME_WAIT) {
844 			struct inet_timewait_sock *tw;
845 
846 			inet_twsk_for_each(tw, node,
847 				    &head->twchain) {
848 
849 				if (num < s_num)
850 					goto next_dying;
851 				if (r->sdiag_family != AF_UNSPEC &&
852 						tw->tw_family != r->sdiag_family)
853 					goto next_dying;
854 				if (r->id.idiag_sport != tw->tw_sport &&
855 				    r->id.idiag_sport)
856 					goto next_dying;
857 				if (r->id.idiag_dport != tw->tw_dport &&
858 				    r->id.idiag_dport)
859 					goto next_dying;
860 				if (inet_twsk_diag_dump(tw, skb, cb, r, bc) < 0) {
861 					spin_unlock_bh(lock);
862 					goto done;
863 				}
864 next_dying:
865 				++num;
866 			}
867 		}
868 		spin_unlock_bh(lock);
869 	}
870 
871 done:
872 	cb->args[1] = i;
873 	cb->args[2] = num;
874 out:
875 	;
876 }
877 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
878 
879 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
880 		struct inet_diag_req_v2 *r, struct nlattr *bc)
881 {
882 	const struct inet_diag_handler *handler;
883 
884 	handler = inet_diag_lock_handler(r->sdiag_protocol);
885 	if (!IS_ERR(handler))
886 		handler->dump(skb, cb, r, bc);
887 	inet_diag_unlock_handler(handler);
888 
889 	return skb->len;
890 }
891 
892 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
893 {
894 	struct nlattr *bc = NULL;
895 	int hdrlen = sizeof(struct inet_diag_req_v2);
896 
897 	if (nlmsg_attrlen(cb->nlh, hdrlen))
898 		bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
899 
900 	return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
901 }
902 
903 static inline int inet_diag_type2proto(int type)
904 {
905 	switch (type) {
906 	case TCPDIAG_GETSOCK:
907 		return IPPROTO_TCP;
908 	case DCCPDIAG_GETSOCK:
909 		return IPPROTO_DCCP;
910 	default:
911 		return 0;
912 	}
913 }
914 
915 static int inet_diag_dump_compat(struct sk_buff *skb, struct netlink_callback *cb)
916 {
917 	struct inet_diag_req *rc = nlmsg_data(cb->nlh);
918 	struct inet_diag_req_v2 req;
919 	struct nlattr *bc = NULL;
920 	int hdrlen = sizeof(struct inet_diag_req);
921 
922 	req.sdiag_family = AF_UNSPEC; /* compatibility */
923 	req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
924 	req.idiag_ext = rc->idiag_ext;
925 	req.idiag_states = rc->idiag_states;
926 	req.id = rc->id;
927 
928 	if (nlmsg_attrlen(cb->nlh, hdrlen))
929 		bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
930 
931 	return __inet_diag_dump(skb, cb, &req, bc);
932 }
933 
934 static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
935 			       const struct nlmsghdr *nlh)
936 {
937 	struct inet_diag_req *rc = nlmsg_data(nlh);
938 	struct inet_diag_req_v2 req;
939 
940 	req.sdiag_family = rc->idiag_family;
941 	req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
942 	req.idiag_ext = rc->idiag_ext;
943 	req.idiag_states = rc->idiag_states;
944 	req.id = rc->id;
945 
946 	return inet_diag_get_exact(in_skb, nlh, &req);
947 }
948 
949 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
950 {
951 	int hdrlen = sizeof(struct inet_diag_req);
952 
953 	if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
954 	    nlmsg_len(nlh) < hdrlen)
955 		return -EINVAL;
956 
957 	if (nlh->nlmsg_flags & NLM_F_DUMP) {
958 		if (nlmsg_attrlen(nlh, hdrlen)) {
959 			struct nlattr *attr;
960 
961 			attr = nlmsg_find_attr(nlh, hdrlen,
962 					       INET_DIAG_REQ_BYTECODE);
963 			if (attr == NULL ||
964 			    nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
965 			    inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
966 				return -EINVAL;
967 		}
968 		{
969 			struct netlink_dump_control c = {
970 				.dump = inet_diag_dump_compat,
971 			};
972 			return netlink_dump_start(sock_diag_nlsk, skb, nlh, &c);
973 		}
974 	}
975 
976 	return inet_diag_get_exact_compat(skb, nlh);
977 }
978 
979 static int inet_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
980 {
981 	int hdrlen = sizeof(struct inet_diag_req_v2);
982 
983 	if (nlmsg_len(h) < hdrlen)
984 		return -EINVAL;
985 
986 	if (h->nlmsg_flags & NLM_F_DUMP) {
987 		if (nlmsg_attrlen(h, hdrlen)) {
988 			struct nlattr *attr;
989 			attr = nlmsg_find_attr(h, hdrlen,
990 					       INET_DIAG_REQ_BYTECODE);
991 			if (attr == NULL ||
992 			    nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
993 			    inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
994 				return -EINVAL;
995 		}
996 		{
997 			struct netlink_dump_control c = {
998 				.dump = inet_diag_dump,
999 			};
1000 			return netlink_dump_start(sock_diag_nlsk, skb, h, &c);
1001 		}
1002 	}
1003 
1004 	return inet_diag_get_exact(skb, h, nlmsg_data(h));
1005 }
1006 
1007 static const struct sock_diag_handler inet_diag_handler = {
1008 	.family = AF_INET,
1009 	.dump = inet_diag_handler_dump,
1010 };
1011 
1012 static const struct sock_diag_handler inet6_diag_handler = {
1013 	.family = AF_INET6,
1014 	.dump = inet_diag_handler_dump,
1015 };
1016 
1017 int inet_diag_register(const struct inet_diag_handler *h)
1018 {
1019 	const __u16 type = h->idiag_type;
1020 	int err = -EINVAL;
1021 
1022 	if (type >= IPPROTO_MAX)
1023 		goto out;
1024 
1025 	mutex_lock(&inet_diag_table_mutex);
1026 	err = -EEXIST;
1027 	if (inet_diag_table[type] == NULL) {
1028 		inet_diag_table[type] = h;
1029 		err = 0;
1030 	}
1031 	mutex_unlock(&inet_diag_table_mutex);
1032 out:
1033 	return err;
1034 }
1035 EXPORT_SYMBOL_GPL(inet_diag_register);
1036 
1037 void inet_diag_unregister(const struct inet_diag_handler *h)
1038 {
1039 	const __u16 type = h->idiag_type;
1040 
1041 	if (type >= IPPROTO_MAX)
1042 		return;
1043 
1044 	mutex_lock(&inet_diag_table_mutex);
1045 	inet_diag_table[type] = NULL;
1046 	mutex_unlock(&inet_diag_table_mutex);
1047 }
1048 EXPORT_SYMBOL_GPL(inet_diag_unregister);
1049 
1050 static int __init inet_diag_init(void)
1051 {
1052 	const int inet_diag_table_size = (IPPROTO_MAX *
1053 					  sizeof(struct inet_diag_handler *));
1054 	int err = -ENOMEM;
1055 
1056 	inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1057 	if (!inet_diag_table)
1058 		goto out;
1059 
1060 	err = sock_diag_register(&inet_diag_handler);
1061 	if (err)
1062 		goto out_free_nl;
1063 
1064 	err = sock_diag_register(&inet6_diag_handler);
1065 	if (err)
1066 		goto out_free_inet;
1067 
1068 	sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1069 out:
1070 	return err;
1071 
1072 out_free_inet:
1073 	sock_diag_unregister(&inet_diag_handler);
1074 out_free_nl:
1075 	kfree(inet_diag_table);
1076 	goto out;
1077 }
1078 
1079 static void __exit inet_diag_exit(void)
1080 {
1081 	sock_diag_unregister(&inet6_diag_handler);
1082 	sock_diag_unregister(&inet_diag_handler);
1083 	sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1084 	kfree(inet_diag_table);
1085 }
1086 
1087 module_init(inet_diag_init);
1088 module_exit(inet_diag_exit);
1089 MODULE_LICENSE("GPL");
1090 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1091 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);
1092