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Merge tag 'for-v4.3' of git://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-power...
[mirror_ubuntu-bionic-kernel.git] / net / ipv4 / inet_diag.c
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 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
244 out:
245 nlmsg_end(skb, nlh);
246 return 0;
247
248 errout:
249 nlmsg_cancel(skb, nlh);
250 return -EMSGSIZE;
251 }
252 EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
253
254 static 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
265 static 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
302 static 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
335 static 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
353 int 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
408 out:
409 if (sk)
410 sock_gen_put(sk);
411
412 out_nosk:
413 return err;
414 }
415 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
416
417 static 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
434 static 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
460 static 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 */
547 static 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
562 int 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 }
578 EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
579
580 static 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. */
598 static 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. */
636 static 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
646 static 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
692 static 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
707 static 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
733 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
734 struct netlink_callback *cb,
735 const struct inet_diag_req_v2 *r,
736 const struct nlattr *bc)
737 {
738 struct inet_connection_sock *icsk = inet_csk(sk);
739 struct inet_sock *inet = inet_sk(sk);
740 struct inet_diag_entry entry;
741 int j, s_j, reqnum, s_reqnum;
742 struct listen_sock *lopt;
743 int err = 0;
744
745 s_j = cb->args[3];
746 s_reqnum = cb->args[4];
747
748 if (s_j > 0)
749 s_j--;
750
751 entry.family = sk->sk_family;
752
753 spin_lock(&icsk->icsk_accept_queue.syn_wait_lock);
754
755 lopt = icsk->icsk_accept_queue.listen_opt;
756 if (!lopt || !listen_sock_qlen(lopt))
757 goto out;
758
759 if (bc) {
760 entry.sport = inet->inet_num;
761 entry.userlocks = sk->sk_userlocks;
762 }
763
764 for (j = s_j; j < lopt->nr_table_entries; j++) {
765 struct request_sock *req, *head = lopt->syn_table[j];
766
767 reqnum = 0;
768 for (req = head; req; reqnum++, req = req->dl_next) {
769 struct inet_request_sock *ireq = inet_rsk(req);
770
771 if (reqnum < s_reqnum)
772 continue;
773 if (r->id.idiag_dport != ireq->ir_rmt_port &&
774 r->id.idiag_dport)
775 continue;
776
777 if (bc) {
778 /* Note: entry.sport and entry.userlocks are already set */
779 entry_fill_addrs(&entry, req_to_sk(req));
780 entry.dport = ntohs(ireq->ir_rmt_port);
781
782 if (!inet_diag_bc_run(bc, &entry))
783 continue;
784 }
785
786 err = inet_req_diag_fill(req_to_sk(req), skb,
787 NETLINK_CB(cb->skb).portid,
788 cb->nlh->nlmsg_seq,
789 NLM_F_MULTI, cb->nlh);
790 if (err < 0) {
791 cb->args[3] = j + 1;
792 cb->args[4] = reqnum;
793 goto out;
794 }
795 }
796
797 s_reqnum = 0;
798 }
799
800 out:
801 spin_unlock(&icsk->icsk_accept_queue.syn_wait_lock);
802
803 return err;
804 }
805
806 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
807 struct netlink_callback *cb,
808 const struct inet_diag_req_v2 *r, struct nlattr *bc)
809 {
810 struct net *net = sock_net(skb->sk);
811 int i, num, s_i, s_num;
812
813 s_i = cb->args[1];
814 s_num = num = cb->args[2];
815
816 if (cb->args[0] == 0) {
817 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
818 goto skip_listen_ht;
819
820 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
821 struct inet_listen_hashbucket *ilb;
822 struct hlist_nulls_node *node;
823 struct sock *sk;
824
825 num = 0;
826 ilb = &hashinfo->listening_hash[i];
827 spin_lock_bh(&ilb->lock);
828 sk_nulls_for_each(sk, node, &ilb->head) {
829 struct inet_sock *inet = inet_sk(sk);
830
831 if (!net_eq(sock_net(sk), net))
832 continue;
833
834 if (num < s_num) {
835 num++;
836 continue;
837 }
838
839 if (r->sdiag_family != AF_UNSPEC &&
840 sk->sk_family != r->sdiag_family)
841 goto next_listen;
842
843 if (r->id.idiag_sport != inet->inet_sport &&
844 r->id.idiag_sport)
845 goto next_listen;
846
847 if (!(r->idiag_states & TCPF_LISTEN) ||
848 r->id.idiag_dport ||
849 cb->args[3] > 0)
850 goto syn_recv;
851
852 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
853 spin_unlock_bh(&ilb->lock);
854 goto done;
855 }
856
857 syn_recv:
858 if (!(r->idiag_states & TCPF_SYN_RECV))
859 goto next_listen;
860
861 if (inet_diag_dump_reqs(skb, sk, cb, r, bc) < 0) {
862 spin_unlock_bh(&ilb->lock);
863 goto done;
864 }
865
866 next_listen:
867 cb->args[3] = 0;
868 cb->args[4] = 0;
869 ++num;
870 }
871 spin_unlock_bh(&ilb->lock);
872
873 s_num = 0;
874 cb->args[3] = 0;
875 cb->args[4] = 0;
876 }
877 skip_listen_ht:
878 cb->args[0] = 1;
879 s_i = num = s_num = 0;
880 }
881
882 if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
883 goto out;
884
885 for (i = s_i; i <= hashinfo->ehash_mask; i++) {
886 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
887 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
888 struct hlist_nulls_node *node;
889 struct sock *sk;
890
891 num = 0;
892
893 if (hlist_nulls_empty(&head->chain))
894 continue;
895
896 if (i > s_i)
897 s_num = 0;
898
899 spin_lock_bh(lock);
900 sk_nulls_for_each(sk, node, &head->chain) {
901 int state, res;
902
903 if (!net_eq(sock_net(sk), net))
904 continue;
905 if (num < s_num)
906 goto next_normal;
907 state = (sk->sk_state == TCP_TIME_WAIT) ?
908 inet_twsk(sk)->tw_substate : sk->sk_state;
909 if (!(r->idiag_states & (1 << state)))
910 goto next_normal;
911 if (r->sdiag_family != AF_UNSPEC &&
912 sk->sk_family != r->sdiag_family)
913 goto next_normal;
914 if (r->id.idiag_sport != htons(sk->sk_num) &&
915 r->id.idiag_sport)
916 goto next_normal;
917 if (r->id.idiag_dport != sk->sk_dport &&
918 r->id.idiag_dport)
919 goto next_normal;
920 twsk_build_assert();
921
922 if (!inet_diag_bc_sk(bc, sk))
923 goto next_normal;
924
925 res = sk_diag_fill(sk, skb, r,
926 sk_user_ns(NETLINK_CB(cb->skb).sk),
927 NETLINK_CB(cb->skb).portid,
928 cb->nlh->nlmsg_seq, NLM_F_MULTI,
929 cb->nlh);
930 if (res < 0) {
931 spin_unlock_bh(lock);
932 goto done;
933 }
934 next_normal:
935 ++num;
936 }
937
938 spin_unlock_bh(lock);
939 }
940
941 done:
942 cb->args[1] = i;
943 cb->args[2] = num;
944 out:
945 ;
946 }
947 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
948
949 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
950 const struct inet_diag_req_v2 *r,
951 struct nlattr *bc)
952 {
953 const struct inet_diag_handler *handler;
954 int err = 0;
955
956 handler = inet_diag_lock_handler(r->sdiag_protocol);
957 if (!IS_ERR(handler))
958 handler->dump(skb, cb, r, bc);
959 else
960 err = PTR_ERR(handler);
961 inet_diag_unlock_handler(handler);
962
963 return err ? : skb->len;
964 }
965
966 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
967 {
968 int hdrlen = sizeof(struct inet_diag_req_v2);
969 struct nlattr *bc = NULL;
970
971 if (nlmsg_attrlen(cb->nlh, hdrlen))
972 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
973
974 return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
975 }
976
977 static int inet_diag_type2proto(int type)
978 {
979 switch (type) {
980 case TCPDIAG_GETSOCK:
981 return IPPROTO_TCP;
982 case DCCPDIAG_GETSOCK:
983 return IPPROTO_DCCP;
984 default:
985 return 0;
986 }
987 }
988
989 static int inet_diag_dump_compat(struct sk_buff *skb,
990 struct netlink_callback *cb)
991 {
992 struct inet_diag_req *rc = nlmsg_data(cb->nlh);
993 int hdrlen = sizeof(struct inet_diag_req);
994 struct inet_diag_req_v2 req;
995 struct nlattr *bc = NULL;
996
997 req.sdiag_family = AF_UNSPEC; /* compatibility */
998 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
999 req.idiag_ext = rc->idiag_ext;
1000 req.idiag_states = rc->idiag_states;
1001 req.id = rc->id;
1002
1003 if (nlmsg_attrlen(cb->nlh, hdrlen))
1004 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1005
1006 return __inet_diag_dump(skb, cb, &req, bc);
1007 }
1008
1009 static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
1010 const struct nlmsghdr *nlh)
1011 {
1012 struct inet_diag_req *rc = nlmsg_data(nlh);
1013 struct inet_diag_req_v2 req;
1014
1015 req.sdiag_family = rc->idiag_family;
1016 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
1017 req.idiag_ext = rc->idiag_ext;
1018 req.idiag_states = rc->idiag_states;
1019 req.id = rc->id;
1020
1021 return inet_diag_get_exact(in_skb, nlh, &req);
1022 }
1023
1024 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
1025 {
1026 int hdrlen = sizeof(struct inet_diag_req);
1027 struct net *net = sock_net(skb->sk);
1028
1029 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
1030 nlmsg_len(nlh) < hdrlen)
1031 return -EINVAL;
1032
1033 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1034 if (nlmsg_attrlen(nlh, hdrlen)) {
1035 struct nlattr *attr;
1036
1037 attr = nlmsg_find_attr(nlh, hdrlen,
1038 INET_DIAG_REQ_BYTECODE);
1039 if (!attr ||
1040 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
1041 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
1042 return -EINVAL;
1043 }
1044 {
1045 struct netlink_dump_control c = {
1046 .dump = inet_diag_dump_compat,
1047 };
1048 return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
1049 }
1050 }
1051
1052 return inet_diag_get_exact_compat(skb, nlh);
1053 }
1054
1055 static int inet_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
1056 {
1057 int hdrlen = sizeof(struct inet_diag_req_v2);
1058 struct net *net = sock_net(skb->sk);
1059
1060 if (nlmsg_len(h) < hdrlen)
1061 return -EINVAL;
1062
1063 if (h->nlmsg_flags & NLM_F_DUMP) {
1064 if (nlmsg_attrlen(h, hdrlen)) {
1065 struct nlattr *attr;
1066
1067 attr = nlmsg_find_attr(h, hdrlen,
1068 INET_DIAG_REQ_BYTECODE);
1069 if (!attr ||
1070 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
1071 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
1072 return -EINVAL;
1073 }
1074 {
1075 struct netlink_dump_control c = {
1076 .dump = inet_diag_dump,
1077 };
1078 return netlink_dump_start(net->diag_nlsk, skb, h, &c);
1079 }
1080 }
1081
1082 return inet_diag_get_exact(skb, h, nlmsg_data(h));
1083 }
1084
1085 static
1086 int inet_diag_handler_get_info(struct sk_buff *skb, struct sock *sk)
1087 {
1088 const struct inet_diag_handler *handler;
1089 struct nlmsghdr *nlh;
1090 struct nlattr *attr;
1091 struct inet_diag_msg *r;
1092 void *info = NULL;
1093 int err = 0;
1094
1095 nlh = nlmsg_put(skb, 0, 0, SOCK_DIAG_BY_FAMILY, sizeof(*r), 0);
1096 if (!nlh)
1097 return -ENOMEM;
1098
1099 r = nlmsg_data(nlh);
1100 memset(r, 0, sizeof(*r));
1101 inet_diag_msg_common_fill(r, sk);
1102 if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_STREAM)
1103 r->id.idiag_sport = inet_sk(sk)->inet_sport;
1104 r->idiag_state = sk->sk_state;
1105
1106 if ((err = nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))) {
1107 nlmsg_cancel(skb, nlh);
1108 return err;
1109 }
1110
1111 handler = inet_diag_lock_handler(sk->sk_protocol);
1112 if (IS_ERR(handler)) {
1113 inet_diag_unlock_handler(handler);
1114 nlmsg_cancel(skb, nlh);
1115 return PTR_ERR(handler);
1116 }
1117
1118 attr = handler->idiag_info_size
1119 ? nla_reserve(skb, INET_DIAG_INFO, handler->idiag_info_size)
1120 : NULL;
1121 if (attr)
1122 info = nla_data(attr);
1123
1124 handler->idiag_get_info(sk, r, info);
1125 inet_diag_unlock_handler(handler);
1126
1127 nlmsg_end(skb, nlh);
1128 return 0;
1129 }
1130
1131 static const struct sock_diag_handler inet_diag_handler = {
1132 .family = AF_INET,
1133 .dump = inet_diag_handler_dump,
1134 .get_info = inet_diag_handler_get_info,
1135 };
1136
1137 static const struct sock_diag_handler inet6_diag_handler = {
1138 .family = AF_INET6,
1139 .dump = inet_diag_handler_dump,
1140 .get_info = inet_diag_handler_get_info,
1141 };
1142
1143 int inet_diag_register(const struct inet_diag_handler *h)
1144 {
1145 const __u16 type = h->idiag_type;
1146 int err = -EINVAL;
1147
1148 if (type >= IPPROTO_MAX)
1149 goto out;
1150
1151 mutex_lock(&inet_diag_table_mutex);
1152 err = -EEXIST;
1153 if (!inet_diag_table[type]) {
1154 inet_diag_table[type] = h;
1155 err = 0;
1156 }
1157 mutex_unlock(&inet_diag_table_mutex);
1158 out:
1159 return err;
1160 }
1161 EXPORT_SYMBOL_GPL(inet_diag_register);
1162
1163 void inet_diag_unregister(const struct inet_diag_handler *h)
1164 {
1165 const __u16 type = h->idiag_type;
1166
1167 if (type >= IPPROTO_MAX)
1168 return;
1169
1170 mutex_lock(&inet_diag_table_mutex);
1171 inet_diag_table[type] = NULL;
1172 mutex_unlock(&inet_diag_table_mutex);
1173 }
1174 EXPORT_SYMBOL_GPL(inet_diag_unregister);
1175
1176 static int __init inet_diag_init(void)
1177 {
1178 const int inet_diag_table_size = (IPPROTO_MAX *
1179 sizeof(struct inet_diag_handler *));
1180 int err = -ENOMEM;
1181
1182 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1183 if (!inet_diag_table)
1184 goto out;
1185
1186 err = sock_diag_register(&inet_diag_handler);
1187 if (err)
1188 goto out_free_nl;
1189
1190 err = sock_diag_register(&inet6_diag_handler);
1191 if (err)
1192 goto out_free_inet;
1193
1194 sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1195 out:
1196 return err;
1197
1198 out_free_inet:
1199 sock_diag_unregister(&inet_diag_handler);
1200 out_free_nl:
1201 kfree(inet_diag_table);
1202 goto out;
1203 }
1204
1205 static void __exit inet_diag_exit(void)
1206 {
1207 sock_diag_unregister(&inet6_diag_handler);
1208 sock_diag_unregister(&inet_diag_handler);
1209 sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1210 kfree(inet_diag_table);
1211 }
1212
1213 module_init(inet_diag_init);
1214 module_exit(inet_diag_exit);
1215 MODULE_LICENSE("GPL");
1216 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1217 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);
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