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
38static const struct inet_diag_handler **inet_diag_table;
39
40struct 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
49static DEFINE_MUTEX(inet_diag_table_mutex);
50
51static 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
64static void inet_diag_unlock_handler(const struct inet_diag_handler *handler)
65{
66	mutex_unlock(&inet_diag_table_mutex);
67}
68
69static 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
93static 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
107int 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		if (((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
156		    nla_put_u8(skb, INET_DIAG_SKV6ONLY, ipv6_only_sock(sk)))
157			goto errout;
158	}
159#endif
160
161	r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
162	r->idiag_inode = sock_i_ino(sk);
163
164	if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
165		struct inet_diag_meminfo minfo = {
166			.idiag_rmem = sk_rmem_alloc_get(sk),
167			.idiag_wmem = sk->sk_wmem_queued,
168			.idiag_fmem = sk->sk_forward_alloc,
169			.idiag_tmem = sk_wmem_alloc_get(sk),
170		};
171
172		if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
173			goto errout;
174	}
175
176	if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
177		if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
178			goto errout;
179
180	if (!icsk) {
181		handler->idiag_get_info(sk, r, NULL);
182		goto out;
183	}
184
185#define EXPIRES_IN_MS(tmo)  DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
186
187	if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
188	    icsk->icsk_pending == ICSK_TIME_EARLY_RETRANS ||
189	    icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
190		r->idiag_timer = 1;
191		r->idiag_retrans = icsk->icsk_retransmits;
192		r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
193	} else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
194		r->idiag_timer = 4;
195		r->idiag_retrans = icsk->icsk_probes_out;
196		r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
197	} else if (timer_pending(&sk->sk_timer)) {
198		r->idiag_timer = 2;
199		r->idiag_retrans = icsk->icsk_probes_out;
200		r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
201	} else {
202		r->idiag_timer = 0;
203		r->idiag_expires = 0;
204	}
205#undef EXPIRES_IN_MS
206
207	if ((ext & (1 << (INET_DIAG_INFO - 1))) && handler->idiag_info_size) {
208		attr = nla_reserve(skb, INET_DIAG_INFO,
209				   handler->idiag_info_size);
210		if (!attr)
211			goto errout;
212
213		info = nla_data(attr);
214	}
215
216	if (ext & (1 << (INET_DIAG_CONG - 1))) {
217		int err = 0;
218
219		rcu_read_lock();
220		ca_ops = READ_ONCE(icsk->icsk_ca_ops);
221		if (ca_ops)
222			err = nla_put_string(skb, INET_DIAG_CONG, ca_ops->name);
223		rcu_read_unlock();
224		if (err < 0)
225			goto errout;
226	}
227
228	handler->idiag_get_info(sk, r, info);
229
230	if (sk->sk_state < TCP_TIME_WAIT) {
231		union tcp_cc_info info;
232		size_t sz = 0;
233		int attr;
234
235		rcu_read_lock();
236		ca_ops = READ_ONCE(icsk->icsk_ca_ops);
237		if (ca_ops && ca_ops->get_info)
238			sz = ca_ops->get_info(sk, ext, &attr, &info);
239		rcu_read_unlock();
240		if (sz && nla_put(skb, attr, sz, &info) < 0)
241			goto errout;
242	}
243
244out:
245	nlmsg_end(skb, nlh);
246	return 0;
247
248errout:
249	nlmsg_cancel(skb, nlh);
250	return -EMSGSIZE;
251}
252EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
253
254static int inet_csk_diag_fill(struct sock *sk,
255			      struct sk_buff *skb,
256			      const struct inet_diag_req_v2 *req,
257			      struct user_namespace *user_ns,
258			      u32 portid, u32 seq, u16 nlmsg_flags,
259			      const struct nlmsghdr *unlh)
260{
261	return inet_sk_diag_fill(sk, inet_csk(sk), skb, req,
262				 user_ns, portid, seq, nlmsg_flags, unlh);
263}
264
265static int inet_twsk_diag_fill(struct sock *sk,
266			       struct sk_buff *skb,
267			       u32 portid, u32 seq, u16 nlmsg_flags,
268			       const struct nlmsghdr *unlh)
269{
270	struct inet_timewait_sock *tw = inet_twsk(sk);
271	struct inet_diag_msg *r;
272	struct nlmsghdr *nlh;
273	long tmo;
274
275	nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
276			nlmsg_flags);
277	if (!nlh)
278		return -EMSGSIZE;
279
280	r = nlmsg_data(nlh);
281	BUG_ON(tw->tw_state != TCP_TIME_WAIT);
282
283	tmo = tw->tw_timer.expires - jiffies;
284	if (tmo < 0)
285		tmo = 0;
286
287	inet_diag_msg_common_fill(r, sk);
288	r->idiag_retrans      = 0;
289
290	r->idiag_state	      = tw->tw_substate;
291	r->idiag_timer	      = 3;
292	r->idiag_expires      = jiffies_to_msecs(tmo);
293	r->idiag_rqueue	      = 0;
294	r->idiag_wqueue	      = 0;
295	r->idiag_uid	      = 0;
296	r->idiag_inode	      = 0;
297
298	nlmsg_end(skb, nlh);
299	return 0;
300}
301
302static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb,
303			      u32 portid, u32 seq, u16 nlmsg_flags,
304			      const struct nlmsghdr *unlh)
305{
306	struct inet_diag_msg *r;
307	struct nlmsghdr *nlh;
308	long tmo;
309
310	nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
311			nlmsg_flags);
312	if (!nlh)
313		return -EMSGSIZE;
314
315	r = nlmsg_data(nlh);
316	inet_diag_msg_common_fill(r, sk);
317	r->idiag_state = TCP_SYN_RECV;
318	r->idiag_timer = 1;
319	r->idiag_retrans = inet_reqsk(sk)->num_retrans;
320
321	BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) !=
322		     offsetof(struct sock, sk_cookie));
323
324	tmo = inet_reqsk(sk)->rsk_timer.expires - jiffies;
325	r->idiag_expires = (tmo >= 0) ? jiffies_to_msecs(tmo) : 0;
326	r->idiag_rqueue	= 0;
327	r->idiag_wqueue	= 0;
328	r->idiag_uid	= 0;
329	r->idiag_inode	= 0;
330
331	nlmsg_end(skb, nlh);
332	return 0;
333}
334
335static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
336			const struct inet_diag_req_v2 *r,
337			struct user_namespace *user_ns,
338			u32 portid, u32 seq, u16 nlmsg_flags,
339			const struct nlmsghdr *unlh)
340{
341	if (sk->sk_state == TCP_TIME_WAIT)
342		return inet_twsk_diag_fill(sk, skb, portid, seq,
343					   nlmsg_flags, unlh);
344
345	if (sk->sk_state == TCP_NEW_SYN_RECV)
346		return inet_req_diag_fill(sk, skb, portid, seq,
347					  nlmsg_flags, unlh);
348
349	return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq,
350				  nlmsg_flags, unlh);
351}
352
353int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo,
354			    struct sk_buff *in_skb,
355			    const struct nlmsghdr *nlh,
356			    const struct inet_diag_req_v2 *req)
357{
358	struct net *net = sock_net(in_skb->sk);
359	struct sk_buff *rep;
360	struct sock *sk;
361	int err;
362
363	err = -EINVAL;
364	if (req->sdiag_family == AF_INET)
365		sk = inet_lookup(net, hashinfo, req->id.idiag_dst[0],
366				 req->id.idiag_dport, req->id.idiag_src[0],
367				 req->id.idiag_sport, req->id.idiag_if);
368#if IS_ENABLED(CONFIG_IPV6)
369	else if (req->sdiag_family == AF_INET6)
370		sk = inet6_lookup(net, hashinfo,
371				  (struct in6_addr *)req->id.idiag_dst,
372				  req->id.idiag_dport,
373				  (struct in6_addr *)req->id.idiag_src,
374				  req->id.idiag_sport,
375				  req->id.idiag_if);
376#endif
377	else
378		goto out_nosk;
379
380	err = -ENOENT;
381	if (!sk)
382		goto out_nosk;
383
384	err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
385	if (err)
386		goto out;
387
388	rep = nlmsg_new(inet_sk_attr_size(), GFP_KERNEL);
389	if (!rep) {
390		err = -ENOMEM;
391		goto out;
392	}
393
394	err = sk_diag_fill(sk, rep, req,
395			   sk_user_ns(NETLINK_CB(in_skb).sk),
396			   NETLINK_CB(in_skb).portid,
397			   nlh->nlmsg_seq, 0, nlh);
398	if (err < 0) {
399		WARN_ON(err == -EMSGSIZE);
400		nlmsg_free(rep);
401		goto out;
402	}
403	err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
404			      MSG_DONTWAIT);
405	if (err > 0)
406		err = 0;
407
408out:
409	if (sk)
410		sock_gen_put(sk);
411
412out_nosk:
413	return err;
414}
415EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
416
417static int inet_diag_get_exact(struct sk_buff *in_skb,
418			       const struct nlmsghdr *nlh,
419			       const struct inet_diag_req_v2 *req)
420{
421	const struct inet_diag_handler *handler;
422	int err;
423
424	handler = inet_diag_lock_handler(req->sdiag_protocol);
425	if (IS_ERR(handler))
426		err = PTR_ERR(handler);
427	else
428		err = handler->dump_one(in_skb, nlh, req);
429	inet_diag_unlock_handler(handler);
430
431	return err;
432}
433
434static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
435{
436	int words = bits >> 5;
437
438	bits &= 0x1f;
439
440	if (words) {
441		if (memcmp(a1, a2, words << 2))
442			return 0;
443	}
444	if (bits) {
445		__be32 w1, w2;
446		__be32 mask;
447
448		w1 = a1[words];
449		w2 = a2[words];
450
451		mask = htonl((0xffffffff) << (32 - bits));
452
453		if ((w1 ^ w2) & mask)
454			return 0;
455	}
456
457	return 1;
458}
459
460static int inet_diag_bc_run(const struct nlattr *_bc,
461			    const struct inet_diag_entry *entry)
462{
463	const void *bc = nla_data(_bc);
464	int len = nla_len(_bc);
465
466	while (len > 0) {
467		int yes = 1;
468		const struct inet_diag_bc_op *op = bc;
469
470		switch (op->code) {
471		case INET_DIAG_BC_NOP:
472			break;
473		case INET_DIAG_BC_JMP:
474			yes = 0;
475			break;
476		case INET_DIAG_BC_S_GE:
477			yes = entry->sport >= op[1].no;
478			break;
479		case INET_DIAG_BC_S_LE:
480			yes = entry->sport <= op[1].no;
481			break;
482		case INET_DIAG_BC_D_GE:
483			yes = entry->dport >= op[1].no;
484			break;
485		case INET_DIAG_BC_D_LE:
486			yes = entry->dport <= op[1].no;
487			break;
488		case INET_DIAG_BC_AUTO:
489			yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
490			break;
491		case INET_DIAG_BC_S_COND:
492		case INET_DIAG_BC_D_COND: {
493			const struct inet_diag_hostcond *cond;
494			const __be32 *addr;
495
496			cond = (const struct inet_diag_hostcond *)(op + 1);
497			if (cond->port != -1 &&
498			    cond->port != (op->code == INET_DIAG_BC_S_COND ?
499					     entry->sport : entry->dport)) {
500				yes = 0;
501				break;
502			}
503
504			if (op->code == INET_DIAG_BC_S_COND)
505				addr = entry->saddr;
506			else
507				addr = entry->daddr;
508
509			if (cond->family != AF_UNSPEC &&
510			    cond->family != entry->family) {
511				if (entry->family == AF_INET6 &&
512				    cond->family == AF_INET) {
513					if (addr[0] == 0 && addr[1] == 0 &&
514					    addr[2] == htonl(0xffff) &&
515					    bitstring_match(addr + 3,
516							    cond->addr,
517							    cond->prefix_len))
518						break;
519				}
520				yes = 0;
521				break;
522			}
523
524			if (cond->prefix_len == 0)
525				break;
526			if (bitstring_match(addr, cond->addr,
527					    cond->prefix_len))
528				break;
529			yes = 0;
530			break;
531		}
532		}
533
534		if (yes) {
535			len -= op->yes;
536			bc += op->yes;
537		} else {
538			len -= op->no;
539			bc += op->no;
540		}
541	}
542	return len == 0;
543}
544
545/* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV)
546 */
547static void entry_fill_addrs(struct inet_diag_entry *entry,
548			     const struct sock *sk)
549{
550#if IS_ENABLED(CONFIG_IPV6)
551	if (sk->sk_family == AF_INET6) {
552		entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32;
553		entry->daddr = sk->sk_v6_daddr.s6_addr32;
554	} else
555#endif
556	{
557		entry->saddr = &sk->sk_rcv_saddr;
558		entry->daddr = &sk->sk_daddr;
559	}
560}
561
562int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
563{
564	struct inet_sock *inet = inet_sk(sk);
565	struct inet_diag_entry entry;
566
567	if (!bc)
568		return 1;
569
570	entry.family = sk->sk_family;
571	entry_fill_addrs(&entry, sk);
572	entry.sport = inet->inet_num;
573	entry.dport = ntohs(inet->inet_dport);
574	entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0;
575
576	return inet_diag_bc_run(bc, &entry);
577}
578EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
579
580static int valid_cc(const void *bc, int len, int cc)
581{
582	while (len >= 0) {
583		const struct inet_diag_bc_op *op = bc;
584
585		if (cc > len)
586			return 0;
587		if (cc == len)
588			return 1;
589		if (op->yes < 4 || op->yes & 3)
590			return 0;
591		len -= op->yes;
592		bc  += op->yes;
593	}
594	return 0;
595}
596
597/* Validate an inet_diag_hostcond. */
598static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
599			   int *min_len)
600{
601	struct inet_diag_hostcond *cond;
602	int addr_len;
603
604	/* Check hostcond space. */
605	*min_len += sizeof(struct inet_diag_hostcond);
606	if (len < *min_len)
607		return false;
608	cond = (struct inet_diag_hostcond *)(op + 1);
609
610	/* Check address family and address length. */
611	switch (cond->family) {
612	case AF_UNSPEC:
613		addr_len = 0;
614		break;
615	case AF_INET:
616		addr_len = sizeof(struct in_addr);
617		break;
618	case AF_INET6:
619		addr_len = sizeof(struct in6_addr);
620		break;
621	default:
622		return false;
623	}
624	*min_len += addr_len;
625	if (len < *min_len)
626		return false;
627
628	/* Check prefix length (in bits) vs address length (in bytes). */
629	if (cond->prefix_len > 8 * addr_len)
630		return false;
631
632	return true;
633}
634
635/* Validate a port comparison operator. */
636static bool valid_port_comparison(const struct inet_diag_bc_op *op,
637				  int len, int *min_len)
638{
639	/* Port comparisons put the port in a follow-on inet_diag_bc_op. */
640	*min_len += sizeof(struct inet_diag_bc_op);
641	if (len < *min_len)
642		return false;
643	return true;
644}
645
646static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
647{
648	const void *bc = bytecode;
649	int  len = bytecode_len;
650
651	while (len > 0) {
652		int min_len = sizeof(struct inet_diag_bc_op);
653		const struct inet_diag_bc_op *op = bc;
654
655		switch (op->code) {
656		case INET_DIAG_BC_S_COND:
657		case INET_DIAG_BC_D_COND:
658			if (!valid_hostcond(bc, len, &min_len))
659				return -EINVAL;
660			break;
661		case INET_DIAG_BC_S_GE:
662		case INET_DIAG_BC_S_LE:
663		case INET_DIAG_BC_D_GE:
664		case INET_DIAG_BC_D_LE:
665			if (!valid_port_comparison(bc, len, &min_len))
666				return -EINVAL;
667			break;
668		case INET_DIAG_BC_AUTO:
669		case INET_DIAG_BC_JMP:
670		case INET_DIAG_BC_NOP:
671			break;
672		default:
673			return -EINVAL;
674		}
675
676		if (op->code != INET_DIAG_BC_NOP) {
677			if (op->no < min_len || op->no > len + 4 || op->no & 3)
678				return -EINVAL;
679			if (op->no < len &&
680			    !valid_cc(bytecode, bytecode_len, len - op->no))
681				return -EINVAL;
682		}
683
684		if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
685			return -EINVAL;
686		bc  += op->yes;
687		len -= op->yes;
688	}
689	return len == 0 ? 0 : -EINVAL;
690}
691
692static int inet_csk_diag_dump(struct sock *sk,
693			      struct sk_buff *skb,
694			      struct netlink_callback *cb,
695			      const struct inet_diag_req_v2 *r,
696			      const struct nlattr *bc)
697{
698	if (!inet_diag_bc_sk(bc, sk))
699		return 0;
700
701	return inet_csk_diag_fill(sk, skb, r,
702				  sk_user_ns(NETLINK_CB(cb->skb).sk),
703				  NETLINK_CB(cb->skb).portid,
704				  cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
705}
706
707static void twsk_build_assert(void)
708{
709	BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) !=
710		     offsetof(struct sock, sk_family));
711
712	BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) !=
713		     offsetof(struct inet_sock, inet_num));
714
715	BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) !=
716		     offsetof(struct inet_sock, inet_dport));
717
718	BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) !=
719		     offsetof(struct inet_sock, inet_rcv_saddr));
720
721	BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) !=
722		     offsetof(struct inet_sock, inet_daddr));
723
724#if IS_ENABLED(CONFIG_IPV6)
725	BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) !=
726		     offsetof(struct sock, sk_v6_rcv_saddr));
727
728	BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) !=
729		     offsetof(struct sock, sk_v6_daddr));
730#endif
731}
732
733void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
734			 struct netlink_callback *cb,
735			 const struct inet_diag_req_v2 *r, struct nlattr *bc)
736{
737	struct net *net = sock_net(skb->sk);
738	int i, num, s_i, s_num;
739	u32 idiag_states = r->idiag_states;
740
741	if (idiag_states & TCPF_SYN_RECV)
742		idiag_states |= TCPF_NEW_SYN_RECV;
743	s_i = cb->args[1];
744	s_num = num = cb->args[2];
745
746	if (cb->args[0] == 0) {
747		if (!(idiag_states & TCPF_LISTEN))
748			goto skip_listen_ht;
749
750		for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
751			struct inet_listen_hashbucket *ilb;
752			struct hlist_nulls_node *node;
753			struct sock *sk;
754
755			num = 0;
756			ilb = &hashinfo->listening_hash[i];
757			spin_lock_bh(&ilb->lock);
758			sk_nulls_for_each(sk, node, &ilb->head) {
759				struct inet_sock *inet = inet_sk(sk);
760
761				if (!net_eq(sock_net(sk), net))
762					continue;
763
764				if (num < s_num) {
765					num++;
766					continue;
767				}
768
769				if (r->sdiag_family != AF_UNSPEC &&
770				    sk->sk_family != r->sdiag_family)
771					goto next_listen;
772
773				if (r->id.idiag_sport != inet->inet_sport &&
774				    r->id.idiag_sport)
775					goto next_listen;
776
777				if (r->id.idiag_dport ||
778				    cb->args[3] > 0)
779					goto next_listen;
780
781				if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
782					spin_unlock_bh(&ilb->lock);
783					goto done;
784				}
785
786next_listen:
787				cb->args[3] = 0;
788				cb->args[4] = 0;
789				++num;
790			}
791			spin_unlock_bh(&ilb->lock);
792
793			s_num = 0;
794			cb->args[3] = 0;
795			cb->args[4] = 0;
796		}
797skip_listen_ht:
798		cb->args[0] = 1;
799		s_i = num = s_num = 0;
800	}
801
802	if (!(idiag_states & ~TCPF_LISTEN))
803		goto out;
804
805	for (i = s_i; i <= hashinfo->ehash_mask; i++) {
806		struct inet_ehash_bucket *head = &hashinfo->ehash[i];
807		spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
808		struct hlist_nulls_node *node;
809		struct sock *sk;
810
811		num = 0;
812
813		if (hlist_nulls_empty(&head->chain))
814			continue;
815
816		if (i > s_i)
817			s_num = 0;
818
819		spin_lock_bh(lock);
820		sk_nulls_for_each(sk, node, &head->chain) {
821			int state, res;
822
823			if (!net_eq(sock_net(sk), net))
824				continue;
825			if (num < s_num)
826				goto next_normal;
827			state = (sk->sk_state == TCP_TIME_WAIT) ?
828				inet_twsk(sk)->tw_substate : sk->sk_state;
829			if (!(idiag_states & (1 << state)))
830				goto next_normal;
831			if (r->sdiag_family != AF_UNSPEC &&
832			    sk->sk_family != r->sdiag_family)
833				goto next_normal;
834			if (r->id.idiag_sport != htons(sk->sk_num) &&
835			    r->id.idiag_sport)
836				goto next_normal;
837			if (r->id.idiag_dport != sk->sk_dport &&
838			    r->id.idiag_dport)
839				goto next_normal;
840			twsk_build_assert();
841
842			if (!inet_diag_bc_sk(bc, sk))
843				goto next_normal;
844
845			res = sk_diag_fill(sk, skb, r,
846					   sk_user_ns(NETLINK_CB(cb->skb).sk),
847					   NETLINK_CB(cb->skb).portid,
848					   cb->nlh->nlmsg_seq, NLM_F_MULTI,
849					   cb->nlh);
850			if (res < 0) {
851				spin_unlock_bh(lock);
852				goto done;
853			}
854next_normal:
855			++num;
856		}
857
858		spin_unlock_bh(lock);
859	}
860
861done:
862	cb->args[1] = i;
863	cb->args[2] = num;
864out:
865	;
866}
867EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
868
869static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
870			    const struct inet_diag_req_v2 *r,
871			    struct nlattr *bc)
872{
873	const struct inet_diag_handler *handler;
874	int err = 0;
875
876	handler = inet_diag_lock_handler(r->sdiag_protocol);
877	if (!IS_ERR(handler))
878		handler->dump(skb, cb, r, bc);
879	else
880		err = PTR_ERR(handler);
881	inet_diag_unlock_handler(handler);
882
883	return err ? : skb->len;
884}
885
886static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
887{
888	int hdrlen = sizeof(struct inet_diag_req_v2);
889	struct nlattr *bc = NULL;
890
891	if (nlmsg_attrlen(cb->nlh, hdrlen))
892		bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
893
894	return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
895}
896
897static int inet_diag_type2proto(int type)
898{
899	switch (type) {
900	case TCPDIAG_GETSOCK:
901		return IPPROTO_TCP;
902	case DCCPDIAG_GETSOCK:
903		return IPPROTO_DCCP;
904	default:
905		return 0;
906	}
907}
908
909static int inet_diag_dump_compat(struct sk_buff *skb,
910				 struct netlink_callback *cb)
911{
912	struct inet_diag_req *rc = nlmsg_data(cb->nlh);
913	int hdrlen = sizeof(struct inet_diag_req);
914	struct inet_diag_req_v2 req;
915	struct nlattr *bc = NULL;
916
917	req.sdiag_family = AF_UNSPEC; /* compatibility */
918	req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
919	req.idiag_ext = rc->idiag_ext;
920	req.idiag_states = rc->idiag_states;
921	req.id = rc->id;
922
923	if (nlmsg_attrlen(cb->nlh, hdrlen))
924		bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
925
926	return __inet_diag_dump(skb, cb, &req, bc);
927}
928
929static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
930				      const struct nlmsghdr *nlh)
931{
932	struct inet_diag_req *rc = nlmsg_data(nlh);
933	struct inet_diag_req_v2 req;
934
935	req.sdiag_family = rc->idiag_family;
936	req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
937	req.idiag_ext = rc->idiag_ext;
938	req.idiag_states = rc->idiag_states;
939	req.id = rc->id;
940
941	return inet_diag_get_exact(in_skb, nlh, &req);
942}
943
944static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
945{
946	int hdrlen = sizeof(struct inet_diag_req);
947	struct net *net = sock_net(skb->sk);
948
949	if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
950	    nlmsg_len(nlh) < hdrlen)
951		return -EINVAL;
952
953	if (nlh->nlmsg_flags & NLM_F_DUMP) {
954		if (nlmsg_attrlen(nlh, hdrlen)) {
955			struct nlattr *attr;
956
957			attr = nlmsg_find_attr(nlh, hdrlen,
958					       INET_DIAG_REQ_BYTECODE);
959			if (!attr ||
960			    nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
961			    inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
962				return -EINVAL;
963		}
964		{
965			struct netlink_dump_control c = {
966				.dump = inet_diag_dump_compat,
967			};
968			return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
969		}
970	}
971
972	return inet_diag_get_exact_compat(skb, nlh);
973}
974
975static int inet_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
976{
977	int hdrlen = sizeof(struct inet_diag_req_v2);
978	struct net *net = sock_net(skb->sk);
979
980	if (nlmsg_len(h) < hdrlen)
981		return -EINVAL;
982
983	if (h->nlmsg_flags & NLM_F_DUMP) {
984		if (nlmsg_attrlen(h, hdrlen)) {
985			struct nlattr *attr;
986
987			attr = nlmsg_find_attr(h, hdrlen,
988					       INET_DIAG_REQ_BYTECODE);
989			if (!attr ||
990			    nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
991			    inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
992				return -EINVAL;
993		}
994		{
995			struct netlink_dump_control c = {
996				.dump = inet_diag_dump,
997			};
998			return netlink_dump_start(net->diag_nlsk, skb, h, &c);
999		}
1000	}
1001
1002	return inet_diag_get_exact(skb, h, nlmsg_data(h));
1003}
1004
1005static
1006int inet_diag_handler_get_info(struct sk_buff *skb, struct sock *sk)
1007{
1008	const struct inet_diag_handler *handler;
1009	struct nlmsghdr *nlh;
1010	struct nlattr *attr;
1011	struct inet_diag_msg *r;
1012	void *info = NULL;
1013	int err = 0;
1014
1015	nlh = nlmsg_put(skb, 0, 0, SOCK_DIAG_BY_FAMILY, sizeof(*r), 0);
1016	if (!nlh)
1017		return -ENOMEM;
1018
1019	r = nlmsg_data(nlh);
1020	memset(r, 0, sizeof(*r));
1021	inet_diag_msg_common_fill(r, sk);
1022	if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_STREAM)
1023		r->id.idiag_sport = inet_sk(sk)->inet_sport;
1024	r->idiag_state = sk->sk_state;
1025
1026	if ((err = nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))) {
1027		nlmsg_cancel(skb, nlh);
1028		return err;
1029	}
1030
1031	handler = inet_diag_lock_handler(sk->sk_protocol);
1032	if (IS_ERR(handler)) {
1033		inet_diag_unlock_handler(handler);
1034		nlmsg_cancel(skb, nlh);
1035		return PTR_ERR(handler);
1036	}
1037
1038	attr = handler->idiag_info_size
1039		? nla_reserve(skb, INET_DIAG_INFO, handler->idiag_info_size)
1040		: NULL;
1041	if (attr)
1042		info = nla_data(attr);
1043
1044	handler->idiag_get_info(sk, r, info);
1045	inet_diag_unlock_handler(handler);
1046
1047	nlmsg_end(skb, nlh);
1048	return 0;
1049}
1050
1051static const struct sock_diag_handler inet_diag_handler = {
1052	.family = AF_INET,
1053	.dump = inet_diag_handler_dump,
1054	.get_info = inet_diag_handler_get_info,
1055};
1056
1057static const struct sock_diag_handler inet6_diag_handler = {
1058	.family = AF_INET6,
1059	.dump = inet_diag_handler_dump,
1060	.get_info = inet_diag_handler_get_info,
1061};
1062
1063int inet_diag_register(const struct inet_diag_handler *h)
1064{
1065	const __u16 type = h->idiag_type;
1066	int err = -EINVAL;
1067
1068	if (type >= IPPROTO_MAX)
1069		goto out;
1070
1071	mutex_lock(&inet_diag_table_mutex);
1072	err = -EEXIST;
1073	if (!inet_diag_table[type]) {
1074		inet_diag_table[type] = h;
1075		err = 0;
1076	}
1077	mutex_unlock(&inet_diag_table_mutex);
1078out:
1079	return err;
1080}
1081EXPORT_SYMBOL_GPL(inet_diag_register);
1082
1083void inet_diag_unregister(const struct inet_diag_handler *h)
1084{
1085	const __u16 type = h->idiag_type;
1086
1087	if (type >= IPPROTO_MAX)
1088		return;
1089
1090	mutex_lock(&inet_diag_table_mutex);
1091	inet_diag_table[type] = NULL;
1092	mutex_unlock(&inet_diag_table_mutex);
1093}
1094EXPORT_SYMBOL_GPL(inet_diag_unregister);
1095
1096static int __init inet_diag_init(void)
1097{
1098	const int inet_diag_table_size = (IPPROTO_MAX *
1099					  sizeof(struct inet_diag_handler *));
1100	int err = -ENOMEM;
1101
1102	inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1103	if (!inet_diag_table)
1104		goto out;
1105
1106	err = sock_diag_register(&inet_diag_handler);
1107	if (err)
1108		goto out_free_nl;
1109
1110	err = sock_diag_register(&inet6_diag_handler);
1111	if (err)
1112		goto out_free_inet;
1113
1114	sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1115out:
1116	return err;
1117
1118out_free_inet:
1119	sock_diag_unregister(&inet_diag_handler);
1120out_free_nl:
1121	kfree(inet_diag_table);
1122	goto out;
1123}
1124
1125static void __exit inet_diag_exit(void)
1126{
1127	sock_diag_unregister(&inet6_diag_handler);
1128	sock_diag_unregister(&inet_diag_handler);
1129	sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1130	kfree(inet_diag_table);
1131}
1132
1133module_init(inet_diag_init);
1134module_exit(inet_diag_exit);
1135MODULE_LICENSE("GPL");
1136MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1137MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);
1138