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Merge tag 'pinctrl-v4.1-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw...
[mirror_ubuntu-zesty-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 __be32 *saddr;
42 __be32 *daddr;
43 u16 sport;
44 u16 dport;
45 u16 family;
46 u16 userlocks;
47 #if IS_ENABLED(CONFIG_IPV6)
48 struct in6_addr saddr_storage; /* for IPv4-mapped-IPv6 addresses */
49 struct in6_addr daddr_storage; /* for IPv4-mapped-IPv6 addresses */
50 #endif
51 };
52
53 static DEFINE_MUTEX(inet_diag_table_mutex);
54
55 static const struct inet_diag_handler *inet_diag_lock_handler(int proto)
56 {
57 if (!inet_diag_table[proto])
58 request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK,
59 NETLINK_SOCK_DIAG, AF_INET, proto);
60
61 mutex_lock(&inet_diag_table_mutex);
62 if (!inet_diag_table[proto])
63 return ERR_PTR(-ENOENT);
64
65 return inet_diag_table[proto];
66 }
67
68 static inline void inet_diag_unlock_handler(
69 const struct inet_diag_handler *handler)
70 {
71 mutex_unlock(&inet_diag_table_mutex);
72 }
73
74 static size_t inet_sk_attr_size(void)
75 {
76 return nla_total_size(sizeof(struct tcp_info))
77 + nla_total_size(1) /* INET_DIAG_SHUTDOWN */
78 + nla_total_size(1) /* INET_DIAG_TOS */
79 + nla_total_size(1) /* INET_DIAG_TCLASS */
80 + nla_total_size(sizeof(struct inet_diag_meminfo))
81 + nla_total_size(sizeof(struct inet_diag_msg))
82 + nla_total_size(SK_MEMINFO_VARS * sizeof(u32))
83 + nla_total_size(TCP_CA_NAME_MAX)
84 + nla_total_size(sizeof(struct tcpvegas_info))
85 + 64;
86 }
87
88 int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
89 struct sk_buff *skb, struct inet_diag_req_v2 *req,
90 struct user_namespace *user_ns,
91 u32 portid, u32 seq, u16 nlmsg_flags,
92 const struct nlmsghdr *unlh)
93 {
94 const struct inet_sock *inet = inet_sk(sk);
95 struct inet_diag_msg *r;
96 struct nlmsghdr *nlh;
97 struct nlattr *attr;
98 void *info = NULL;
99 const struct inet_diag_handler *handler;
100 int ext = req->idiag_ext;
101
102 handler = inet_diag_table[req->sdiag_protocol];
103 BUG_ON(handler == NULL);
104
105 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
106 nlmsg_flags);
107 if (!nlh)
108 return -EMSGSIZE;
109
110 r = nlmsg_data(nlh);
111 BUG_ON(sk->sk_state == TCP_TIME_WAIT);
112
113 r->idiag_family = sk->sk_family;
114 r->idiag_state = sk->sk_state;
115 r->idiag_timer = 0;
116 r->idiag_retrans = 0;
117
118 r->id.idiag_if = sk->sk_bound_dev_if;
119 sock_diag_save_cookie(sk, r->id.idiag_cookie);
120
121 r->id.idiag_sport = inet->inet_sport;
122 r->id.idiag_dport = inet->inet_dport;
123
124 memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
125 memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
126
127 r->id.idiag_src[0] = inet->inet_rcv_saddr;
128 r->id.idiag_dst[0] = inet->inet_daddr;
129
130 if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown))
131 goto errout;
132
133 /* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
134 * hence this needs to be included regardless of socket family.
135 */
136 if (ext & (1 << (INET_DIAG_TOS - 1)))
137 if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0)
138 goto errout;
139
140 #if IS_ENABLED(CONFIG_IPV6)
141 if (r->idiag_family == AF_INET6) {
142
143 *(struct in6_addr *)r->id.idiag_src = sk->sk_v6_rcv_saddr;
144 *(struct in6_addr *)r->id.idiag_dst = sk->sk_v6_daddr;
145
146 if (ext & (1 << (INET_DIAG_TCLASS - 1)))
147 if (nla_put_u8(skb, INET_DIAG_TCLASS,
148 inet6_sk(sk)->tclass) < 0)
149 goto errout;
150 }
151 #endif
152
153 r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
154 r->idiag_inode = sock_i_ino(sk);
155
156 if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
157 struct inet_diag_meminfo minfo = {
158 .idiag_rmem = sk_rmem_alloc_get(sk),
159 .idiag_wmem = sk->sk_wmem_queued,
160 .idiag_fmem = sk->sk_forward_alloc,
161 .idiag_tmem = sk_wmem_alloc_get(sk),
162 };
163
164 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
165 goto errout;
166 }
167
168 if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
169 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
170 goto errout;
171
172 if (icsk == NULL) {
173 handler->idiag_get_info(sk, r, NULL);
174 goto out;
175 }
176
177 #define EXPIRES_IN_MS(tmo) DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
178
179 if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
180 icsk->icsk_pending == ICSK_TIME_EARLY_RETRANS ||
181 icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
182 r->idiag_timer = 1;
183 r->idiag_retrans = icsk->icsk_retransmits;
184 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
185 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
186 r->idiag_timer = 4;
187 r->idiag_retrans = icsk->icsk_probes_out;
188 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
189 } else if (timer_pending(&sk->sk_timer)) {
190 r->idiag_timer = 2;
191 r->idiag_retrans = icsk->icsk_probes_out;
192 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
193 } else {
194 r->idiag_timer = 0;
195 r->idiag_expires = 0;
196 }
197 #undef EXPIRES_IN_MS
198
199 if (ext & (1 << (INET_DIAG_INFO - 1))) {
200 attr = nla_reserve(skb, INET_DIAG_INFO,
201 sizeof(struct tcp_info));
202 if (!attr)
203 goto errout;
204
205 info = nla_data(attr);
206 }
207
208 if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops)
209 if (nla_put_string(skb, INET_DIAG_CONG,
210 icsk->icsk_ca_ops->name) < 0)
211 goto errout;
212
213 handler->idiag_get_info(sk, r, info);
214
215 if (sk->sk_state < TCP_TIME_WAIT &&
216 icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
217 icsk->icsk_ca_ops->get_info(sk, ext, skb);
218
219 out:
220 nlmsg_end(skb, nlh);
221 return 0;
222
223 errout:
224 nlmsg_cancel(skb, nlh);
225 return -EMSGSIZE;
226 }
227 EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
228
229 static int inet_csk_diag_fill(struct sock *sk,
230 struct sk_buff *skb, struct inet_diag_req_v2 *req,
231 struct user_namespace *user_ns,
232 u32 portid, u32 seq, u16 nlmsg_flags,
233 const struct nlmsghdr *unlh)
234 {
235 return inet_sk_diag_fill(sk, inet_csk(sk),
236 skb, req, user_ns, portid, seq, nlmsg_flags, unlh);
237 }
238
239 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw,
240 struct sk_buff *skb, struct inet_diag_req_v2 *req,
241 u32 portid, u32 seq, u16 nlmsg_flags,
242 const struct nlmsghdr *unlh)
243 {
244 s32 tmo;
245 struct inet_diag_msg *r;
246 struct nlmsghdr *nlh;
247
248 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
249 nlmsg_flags);
250 if (!nlh)
251 return -EMSGSIZE;
252
253 r = nlmsg_data(nlh);
254 BUG_ON(tw->tw_state != TCP_TIME_WAIT);
255
256 tmo = tw->tw_ttd - inet_tw_time_stamp();
257 if (tmo < 0)
258 tmo = 0;
259
260 r->idiag_family = tw->tw_family;
261 r->idiag_retrans = 0;
262
263 r->id.idiag_if = tw->tw_bound_dev_if;
264 sock_diag_save_cookie(tw, r->id.idiag_cookie);
265
266 r->id.idiag_sport = tw->tw_sport;
267 r->id.idiag_dport = tw->tw_dport;
268
269 memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
270 memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
271
272 r->id.idiag_src[0] = tw->tw_rcv_saddr;
273 r->id.idiag_dst[0] = tw->tw_daddr;
274
275 r->idiag_state = tw->tw_substate;
276 r->idiag_timer = 3;
277 r->idiag_expires = jiffies_to_msecs(tmo);
278 r->idiag_rqueue = 0;
279 r->idiag_wqueue = 0;
280 r->idiag_uid = 0;
281 r->idiag_inode = 0;
282 #if IS_ENABLED(CONFIG_IPV6)
283 if (tw->tw_family == AF_INET6) {
284 *(struct in6_addr *)r->id.idiag_src = tw->tw_v6_rcv_saddr;
285 *(struct in6_addr *)r->id.idiag_dst = tw->tw_v6_daddr;
286 }
287 #endif
288
289 nlmsg_end(skb, nlh);
290 return 0;
291 }
292
293 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
294 struct inet_diag_req_v2 *r,
295 struct user_namespace *user_ns,
296 u32 portid, u32 seq, u16 nlmsg_flags,
297 const struct nlmsghdr *unlh)
298 {
299 if (sk->sk_state == TCP_TIME_WAIT)
300 return inet_twsk_diag_fill(inet_twsk(sk), skb, r, portid, seq,
301 nlmsg_flags, unlh);
302
303 return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq,
304 nlmsg_flags, unlh);
305 }
306
307 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *in_skb,
308 const struct nlmsghdr *nlh, struct inet_diag_req_v2 *req)
309 {
310 int err;
311 struct sock *sk;
312 struct sk_buff *rep;
313 struct net *net = sock_net(in_skb->sk);
314
315 err = -EINVAL;
316 if (req->sdiag_family == AF_INET) {
317 sk = inet_lookup(net, hashinfo, req->id.idiag_dst[0],
318 req->id.idiag_dport, req->id.idiag_src[0],
319 req->id.idiag_sport, req->id.idiag_if);
320 }
321 #if IS_ENABLED(CONFIG_IPV6)
322 else if (req->sdiag_family == AF_INET6) {
323 sk = inet6_lookup(net, hashinfo,
324 (struct in6_addr *)req->id.idiag_dst,
325 req->id.idiag_dport,
326 (struct in6_addr *)req->id.idiag_src,
327 req->id.idiag_sport,
328 req->id.idiag_if);
329 }
330 #endif
331 else {
332 goto out_nosk;
333 }
334
335 err = -ENOENT;
336 if (sk == NULL)
337 goto out_nosk;
338
339 err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
340 if (err)
341 goto out;
342
343 rep = nlmsg_new(inet_sk_attr_size(), GFP_KERNEL);
344 if (!rep) {
345 err = -ENOMEM;
346 goto out;
347 }
348
349 err = sk_diag_fill(sk, rep, req,
350 sk_user_ns(NETLINK_CB(in_skb).sk),
351 NETLINK_CB(in_skb).portid,
352 nlh->nlmsg_seq, 0, nlh);
353 if (err < 0) {
354 WARN_ON(err == -EMSGSIZE);
355 nlmsg_free(rep);
356 goto out;
357 }
358 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
359 MSG_DONTWAIT);
360 if (err > 0)
361 err = 0;
362
363 out:
364 if (sk)
365 sock_gen_put(sk);
366
367 out_nosk:
368 return err;
369 }
370 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
371
372 static int inet_diag_get_exact(struct sk_buff *in_skb,
373 const struct nlmsghdr *nlh,
374 struct inet_diag_req_v2 *req)
375 {
376 const struct inet_diag_handler *handler;
377 int err;
378
379 handler = inet_diag_lock_handler(req->sdiag_protocol);
380 if (IS_ERR(handler))
381 err = PTR_ERR(handler);
382 else
383 err = handler->dump_one(in_skb, nlh, req);
384 inet_diag_unlock_handler(handler);
385
386 return err;
387 }
388
389 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
390 {
391 int words = bits >> 5;
392
393 bits &= 0x1f;
394
395 if (words) {
396 if (memcmp(a1, a2, words << 2))
397 return 0;
398 }
399 if (bits) {
400 __be32 w1, w2;
401 __be32 mask;
402
403 w1 = a1[words];
404 w2 = a2[words];
405
406 mask = htonl((0xffffffff) << (32 - bits));
407
408 if ((w1 ^ w2) & mask)
409 return 0;
410 }
411
412 return 1;
413 }
414
415
416 static int inet_diag_bc_run(const struct nlattr *_bc,
417 const struct inet_diag_entry *entry)
418 {
419 const void *bc = nla_data(_bc);
420 int len = nla_len(_bc);
421
422 while (len > 0) {
423 int yes = 1;
424 const struct inet_diag_bc_op *op = bc;
425
426 switch (op->code) {
427 case INET_DIAG_BC_NOP:
428 break;
429 case INET_DIAG_BC_JMP:
430 yes = 0;
431 break;
432 case INET_DIAG_BC_S_GE:
433 yes = entry->sport >= op[1].no;
434 break;
435 case INET_DIAG_BC_S_LE:
436 yes = entry->sport <= op[1].no;
437 break;
438 case INET_DIAG_BC_D_GE:
439 yes = entry->dport >= op[1].no;
440 break;
441 case INET_DIAG_BC_D_LE:
442 yes = entry->dport <= op[1].no;
443 break;
444 case INET_DIAG_BC_AUTO:
445 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
446 break;
447 case INET_DIAG_BC_S_COND:
448 case INET_DIAG_BC_D_COND: {
449 struct inet_diag_hostcond *cond;
450 __be32 *addr;
451
452 cond = (struct inet_diag_hostcond *)(op + 1);
453 if (cond->port != -1 &&
454 cond->port != (op->code == INET_DIAG_BC_S_COND ?
455 entry->sport : entry->dport)) {
456 yes = 0;
457 break;
458 }
459
460 if (op->code == INET_DIAG_BC_S_COND)
461 addr = entry->saddr;
462 else
463 addr = entry->daddr;
464
465 if (cond->family != AF_UNSPEC &&
466 cond->family != entry->family) {
467 if (entry->family == AF_INET6 &&
468 cond->family == AF_INET) {
469 if (addr[0] == 0 && addr[1] == 0 &&
470 addr[2] == htonl(0xffff) &&
471 bitstring_match(addr + 3,
472 cond->addr,
473 cond->prefix_len))
474 break;
475 }
476 yes = 0;
477 break;
478 }
479
480 if (cond->prefix_len == 0)
481 break;
482 if (bitstring_match(addr, cond->addr,
483 cond->prefix_len))
484 break;
485 yes = 0;
486 break;
487 }
488 }
489
490 if (yes) {
491 len -= op->yes;
492 bc += op->yes;
493 } else {
494 len -= op->no;
495 bc += op->no;
496 }
497 }
498 return len == 0;
499 }
500
501 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
502 {
503 struct inet_diag_entry entry;
504 struct inet_sock *inet = inet_sk(sk);
505
506 if (bc == NULL)
507 return 1;
508
509 entry.family = sk->sk_family;
510 #if IS_ENABLED(CONFIG_IPV6)
511 if (entry.family == AF_INET6) {
512
513 entry.saddr = sk->sk_v6_rcv_saddr.s6_addr32;
514 entry.daddr = sk->sk_v6_daddr.s6_addr32;
515 } else
516 #endif
517 {
518 entry.saddr = &inet->inet_rcv_saddr;
519 entry.daddr = &inet->inet_daddr;
520 }
521 entry.sport = inet->inet_num;
522 entry.dport = ntohs(inet->inet_dport);
523 entry.userlocks = sk->sk_userlocks;
524
525 return inet_diag_bc_run(bc, &entry);
526 }
527 EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
528
529 static int valid_cc(const void *bc, int len, int cc)
530 {
531 while (len >= 0) {
532 const struct inet_diag_bc_op *op = bc;
533
534 if (cc > len)
535 return 0;
536 if (cc == len)
537 return 1;
538 if (op->yes < 4 || op->yes & 3)
539 return 0;
540 len -= op->yes;
541 bc += op->yes;
542 }
543 return 0;
544 }
545
546 /* Validate an inet_diag_hostcond. */
547 static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
548 int *min_len)
549 {
550 int addr_len;
551 struct inet_diag_hostcond *cond;
552
553 /* Check hostcond space. */
554 *min_len += sizeof(struct inet_diag_hostcond);
555 if (len < *min_len)
556 return false;
557 cond = (struct inet_diag_hostcond *)(op + 1);
558
559 /* Check address family and address length. */
560 switch (cond->family) {
561 case AF_UNSPEC:
562 addr_len = 0;
563 break;
564 case AF_INET:
565 addr_len = sizeof(struct in_addr);
566 break;
567 case AF_INET6:
568 addr_len = sizeof(struct in6_addr);
569 break;
570 default:
571 return false;
572 }
573 *min_len += addr_len;
574 if (len < *min_len)
575 return false;
576
577 /* Check prefix length (in bits) vs address length (in bytes). */
578 if (cond->prefix_len > 8 * addr_len)
579 return false;
580
581 return true;
582 }
583
584 /* Validate a port comparison operator. */
585 static inline bool valid_port_comparison(const struct inet_diag_bc_op *op,
586 int len, int *min_len)
587 {
588 /* Port comparisons put the port in a follow-on inet_diag_bc_op. */
589 *min_len += sizeof(struct inet_diag_bc_op);
590 if (len < *min_len)
591 return false;
592 return true;
593 }
594
595 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
596 {
597 const void *bc = bytecode;
598 int len = bytecode_len;
599
600 while (len > 0) {
601 const struct inet_diag_bc_op *op = bc;
602 int min_len = sizeof(struct inet_diag_bc_op);
603
604 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
605 switch (op->code) {
606 case INET_DIAG_BC_S_COND:
607 case INET_DIAG_BC_D_COND:
608 if (!valid_hostcond(bc, len, &min_len))
609 return -EINVAL;
610 break;
611 case INET_DIAG_BC_S_GE:
612 case INET_DIAG_BC_S_LE:
613 case INET_DIAG_BC_D_GE:
614 case INET_DIAG_BC_D_LE:
615 if (!valid_port_comparison(bc, len, &min_len))
616 return -EINVAL;
617 break;
618 case INET_DIAG_BC_AUTO:
619 case INET_DIAG_BC_JMP:
620 case INET_DIAG_BC_NOP:
621 break;
622 default:
623 return -EINVAL;
624 }
625
626 if (op->code != INET_DIAG_BC_NOP) {
627 if (op->no < min_len || op->no > len + 4 || op->no & 3)
628 return -EINVAL;
629 if (op->no < len &&
630 !valid_cc(bytecode, bytecode_len, len - op->no))
631 return -EINVAL;
632 }
633
634 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
635 return -EINVAL;
636 bc += op->yes;
637 len -= op->yes;
638 }
639 return len == 0 ? 0 : -EINVAL;
640 }
641
642 static int inet_csk_diag_dump(struct sock *sk,
643 struct sk_buff *skb,
644 struct netlink_callback *cb,
645 struct inet_diag_req_v2 *r,
646 const struct nlattr *bc)
647 {
648 if (!inet_diag_bc_sk(bc, sk))
649 return 0;
650
651 return inet_csk_diag_fill(sk, skb, r,
652 sk_user_ns(NETLINK_CB(cb->skb).sk),
653 NETLINK_CB(cb->skb).portid,
654 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
655 }
656
657 static int inet_twsk_diag_dump(struct sock *sk,
658 struct sk_buff *skb,
659 struct netlink_callback *cb,
660 struct inet_diag_req_v2 *r,
661 const struct nlattr *bc)
662 {
663 struct inet_timewait_sock *tw = inet_twsk(sk);
664
665 if (bc != NULL) {
666 struct inet_diag_entry entry;
667
668 entry.family = tw->tw_family;
669 #if IS_ENABLED(CONFIG_IPV6)
670 if (tw->tw_family == AF_INET6) {
671 entry.saddr = tw->tw_v6_rcv_saddr.s6_addr32;
672 entry.daddr = tw->tw_v6_daddr.s6_addr32;
673 } else
674 #endif
675 {
676 entry.saddr = &tw->tw_rcv_saddr;
677 entry.daddr = &tw->tw_daddr;
678 }
679 entry.sport = tw->tw_num;
680 entry.dport = ntohs(tw->tw_dport);
681 entry.userlocks = 0;
682
683 if (!inet_diag_bc_run(bc, &entry))
684 return 0;
685 }
686
687 return inet_twsk_diag_fill(tw, skb, r,
688 NETLINK_CB(cb->skb).portid,
689 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
690 }
691
692 /* Get the IPv4, IPv6, or IPv4-mapped-IPv6 local and remote addresses
693 * from a request_sock. For IPv4-mapped-IPv6 we must map IPv4 to IPv6.
694 */
695 static inline void inet_diag_req_addrs(const struct sock *sk,
696 const struct request_sock *req,
697 struct inet_diag_entry *entry)
698 {
699 struct inet_request_sock *ireq = inet_rsk(req);
700
701 #if IS_ENABLED(CONFIG_IPV6)
702 if (sk->sk_family == AF_INET6) {
703 if (req->rsk_ops->family == AF_INET6) {
704 entry->saddr = ireq->ir_v6_loc_addr.s6_addr32;
705 entry->daddr = ireq->ir_v6_rmt_addr.s6_addr32;
706 } else if (req->rsk_ops->family == AF_INET) {
707 ipv6_addr_set_v4mapped(ireq->ir_loc_addr,
708 &entry->saddr_storage);
709 ipv6_addr_set_v4mapped(ireq->ir_rmt_addr,
710 &entry->daddr_storage);
711 entry->saddr = entry->saddr_storage.s6_addr32;
712 entry->daddr = entry->daddr_storage.s6_addr32;
713 }
714 } else
715 #endif
716 {
717 entry->saddr = &ireq->ir_loc_addr;
718 entry->daddr = &ireq->ir_rmt_addr;
719 }
720 }
721
722 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
723 struct request_sock *req,
724 struct user_namespace *user_ns,
725 u32 portid, u32 seq,
726 const struct nlmsghdr *unlh)
727 {
728 const struct inet_request_sock *ireq = inet_rsk(req);
729 struct inet_sock *inet = inet_sk(sk);
730 struct inet_diag_msg *r;
731 struct nlmsghdr *nlh;
732 long tmo;
733
734 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
735 NLM_F_MULTI);
736 if (!nlh)
737 return -EMSGSIZE;
738
739 r = nlmsg_data(nlh);
740 r->idiag_family = sk->sk_family;
741 r->idiag_state = TCP_SYN_RECV;
742 r->idiag_timer = 1;
743 r->idiag_retrans = req->num_retrans;
744
745 r->id.idiag_if = sk->sk_bound_dev_if;
746 sock_diag_save_cookie(req, r->id.idiag_cookie);
747
748 tmo = req->expires - jiffies;
749 if (tmo < 0)
750 tmo = 0;
751
752 r->id.idiag_sport = inet->inet_sport;
753 r->id.idiag_dport = ireq->ir_rmt_port;
754
755 memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
756 memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
757
758 r->id.idiag_src[0] = ireq->ir_loc_addr;
759 r->id.idiag_dst[0] = ireq->ir_rmt_addr;
760
761 r->idiag_expires = jiffies_to_msecs(tmo);
762 r->idiag_rqueue = 0;
763 r->idiag_wqueue = 0;
764 r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
765 r->idiag_inode = 0;
766 #if IS_ENABLED(CONFIG_IPV6)
767 if (r->idiag_family == AF_INET6) {
768 struct inet_diag_entry entry;
769 inet_diag_req_addrs(sk, req, &entry);
770 memcpy(r->id.idiag_src, entry.saddr, sizeof(struct in6_addr));
771 memcpy(r->id.idiag_dst, entry.daddr, sizeof(struct in6_addr));
772 }
773 #endif
774
775 nlmsg_end(skb, nlh);
776 return 0;
777 }
778
779 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
780 struct netlink_callback *cb,
781 struct inet_diag_req_v2 *r,
782 const struct nlattr *bc)
783 {
784 struct inet_diag_entry entry;
785 struct inet_connection_sock *icsk = inet_csk(sk);
786 struct listen_sock *lopt;
787 struct inet_sock *inet = inet_sk(sk);
788 int j, s_j;
789 int reqnum, s_reqnum;
790 int err = 0;
791
792 s_j = cb->args[3];
793 s_reqnum = cb->args[4];
794
795 if (s_j > 0)
796 s_j--;
797
798 entry.family = sk->sk_family;
799
800 read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
801
802 lopt = icsk->icsk_accept_queue.listen_opt;
803 if (!lopt || !lopt->qlen)
804 goto out;
805
806 if (bc != NULL) {
807 entry.sport = inet->inet_num;
808 entry.userlocks = sk->sk_userlocks;
809 }
810
811 for (j = s_j; j < lopt->nr_table_entries; j++) {
812 struct request_sock *req, *head = lopt->syn_table[j];
813
814 reqnum = 0;
815 for (req = head; req; reqnum++, req = req->dl_next) {
816 struct inet_request_sock *ireq = inet_rsk(req);
817
818 if (reqnum < s_reqnum)
819 continue;
820 if (r->id.idiag_dport != ireq->ir_rmt_port &&
821 r->id.idiag_dport)
822 continue;
823
824 if (bc) {
825 inet_diag_req_addrs(sk, req, &entry);
826 entry.dport = ntohs(ireq->ir_rmt_port);
827
828 if (!inet_diag_bc_run(bc, &entry))
829 continue;
830 }
831
832 err = inet_diag_fill_req(skb, sk, req,
833 sk_user_ns(NETLINK_CB(cb->skb).sk),
834 NETLINK_CB(cb->skb).portid,
835 cb->nlh->nlmsg_seq, cb->nlh);
836 if (err < 0) {
837 cb->args[3] = j + 1;
838 cb->args[4] = reqnum;
839 goto out;
840 }
841 }
842
843 s_reqnum = 0;
844 }
845
846 out:
847 read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
848
849 return err;
850 }
851
852 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
853 struct netlink_callback *cb, struct inet_diag_req_v2 *r, struct nlattr *bc)
854 {
855 int i, num;
856 int s_i, s_num;
857 struct net *net = sock_net(skb->sk);
858
859 s_i = cb->args[1];
860 s_num = num = cb->args[2];
861
862 if (cb->args[0] == 0) {
863 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
864 goto skip_listen_ht;
865
866 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
867 struct sock *sk;
868 struct hlist_nulls_node *node;
869 struct inet_listen_hashbucket *ilb;
870
871 num = 0;
872 ilb = &hashinfo->listening_hash[i];
873 spin_lock_bh(&ilb->lock);
874 sk_nulls_for_each(sk, node, &ilb->head) {
875 struct inet_sock *inet = inet_sk(sk);
876
877 if (!net_eq(sock_net(sk), net))
878 continue;
879
880 if (num < s_num) {
881 num++;
882 continue;
883 }
884
885 if (r->sdiag_family != AF_UNSPEC &&
886 sk->sk_family != r->sdiag_family)
887 goto next_listen;
888
889 if (r->id.idiag_sport != inet->inet_sport &&
890 r->id.idiag_sport)
891 goto next_listen;
892
893 if (!(r->idiag_states & TCPF_LISTEN) ||
894 r->id.idiag_dport ||
895 cb->args[3] > 0)
896 goto syn_recv;
897
898 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
899 spin_unlock_bh(&ilb->lock);
900 goto done;
901 }
902
903 syn_recv:
904 if (!(r->idiag_states & TCPF_SYN_RECV))
905 goto next_listen;
906
907 if (inet_diag_dump_reqs(skb, sk, cb, r, bc) < 0) {
908 spin_unlock_bh(&ilb->lock);
909 goto done;
910 }
911
912 next_listen:
913 cb->args[3] = 0;
914 cb->args[4] = 0;
915 ++num;
916 }
917 spin_unlock_bh(&ilb->lock);
918
919 s_num = 0;
920 cb->args[3] = 0;
921 cb->args[4] = 0;
922 }
923 skip_listen_ht:
924 cb->args[0] = 1;
925 s_i = num = s_num = 0;
926 }
927
928 if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
929 goto out;
930
931 for (i = s_i; i <= hashinfo->ehash_mask; i++) {
932 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
933 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
934 struct sock *sk;
935 struct hlist_nulls_node *node;
936
937 num = 0;
938
939 if (hlist_nulls_empty(&head->chain))
940 continue;
941
942 if (i > s_i)
943 s_num = 0;
944
945 spin_lock_bh(lock);
946 sk_nulls_for_each(sk, node, &head->chain) {
947 int res;
948 int state;
949
950 if (!net_eq(sock_net(sk), net))
951 continue;
952 if (num < s_num)
953 goto next_normal;
954 state = (sk->sk_state == TCP_TIME_WAIT) ?
955 inet_twsk(sk)->tw_substate : sk->sk_state;
956 if (!(r->idiag_states & (1 << state)))
957 goto next_normal;
958 if (r->sdiag_family != AF_UNSPEC &&
959 sk->sk_family != r->sdiag_family)
960 goto next_normal;
961 if (r->id.idiag_sport != htons(sk->sk_num) &&
962 r->id.idiag_sport)
963 goto next_normal;
964 if (r->id.idiag_dport != sk->sk_dport &&
965 r->id.idiag_dport)
966 goto next_normal;
967 if (sk->sk_state == TCP_TIME_WAIT)
968 res = inet_twsk_diag_dump(sk, skb, cb, r, bc);
969 else
970 res = inet_csk_diag_dump(sk, skb, cb, r, bc);
971 if (res < 0) {
972 spin_unlock_bh(lock);
973 goto done;
974 }
975 next_normal:
976 ++num;
977 }
978
979 spin_unlock_bh(lock);
980 }
981
982 done:
983 cb->args[1] = i;
984 cb->args[2] = num;
985 out:
986 ;
987 }
988 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
989
990 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
991 struct inet_diag_req_v2 *r, struct nlattr *bc)
992 {
993 const struct inet_diag_handler *handler;
994 int err = 0;
995
996 handler = inet_diag_lock_handler(r->sdiag_protocol);
997 if (!IS_ERR(handler))
998 handler->dump(skb, cb, r, bc);
999 else
1000 err = PTR_ERR(handler);
1001 inet_diag_unlock_handler(handler);
1002
1003 return err ? : skb->len;
1004 }
1005
1006 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
1007 {
1008 struct nlattr *bc = NULL;
1009 int hdrlen = sizeof(struct inet_diag_req_v2);
1010
1011 if (nlmsg_attrlen(cb->nlh, hdrlen))
1012 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1013
1014 return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
1015 }
1016
1017 static inline int inet_diag_type2proto(int type)
1018 {
1019 switch (type) {
1020 case TCPDIAG_GETSOCK:
1021 return IPPROTO_TCP;
1022 case DCCPDIAG_GETSOCK:
1023 return IPPROTO_DCCP;
1024 default:
1025 return 0;
1026 }
1027 }
1028
1029 static int inet_diag_dump_compat(struct sk_buff *skb, struct netlink_callback *cb)
1030 {
1031 struct inet_diag_req *rc = nlmsg_data(cb->nlh);
1032 struct inet_diag_req_v2 req;
1033 struct nlattr *bc = NULL;
1034 int hdrlen = sizeof(struct inet_diag_req);
1035
1036 req.sdiag_family = AF_UNSPEC; /* compatibility */
1037 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
1038 req.idiag_ext = rc->idiag_ext;
1039 req.idiag_states = rc->idiag_states;
1040 req.id = rc->id;
1041
1042 if (nlmsg_attrlen(cb->nlh, hdrlen))
1043 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1044
1045 return __inet_diag_dump(skb, cb, &req, bc);
1046 }
1047
1048 static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
1049 const struct nlmsghdr *nlh)
1050 {
1051 struct inet_diag_req *rc = nlmsg_data(nlh);
1052 struct inet_diag_req_v2 req;
1053
1054 req.sdiag_family = rc->idiag_family;
1055 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
1056 req.idiag_ext = rc->idiag_ext;
1057 req.idiag_states = rc->idiag_states;
1058 req.id = rc->id;
1059
1060 return inet_diag_get_exact(in_skb, nlh, &req);
1061 }
1062
1063 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
1064 {
1065 int hdrlen = sizeof(struct inet_diag_req);
1066 struct net *net = sock_net(skb->sk);
1067
1068 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
1069 nlmsg_len(nlh) < hdrlen)
1070 return -EINVAL;
1071
1072 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1073 if (nlmsg_attrlen(nlh, hdrlen)) {
1074 struct nlattr *attr;
1075
1076 attr = nlmsg_find_attr(nlh, hdrlen,
1077 INET_DIAG_REQ_BYTECODE);
1078 if (attr == NULL ||
1079 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
1080 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
1081 return -EINVAL;
1082 }
1083 {
1084 struct netlink_dump_control c = {
1085 .dump = inet_diag_dump_compat,
1086 };
1087 return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
1088 }
1089 }
1090
1091 return inet_diag_get_exact_compat(skb, nlh);
1092 }
1093
1094 static int inet_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
1095 {
1096 int hdrlen = sizeof(struct inet_diag_req_v2);
1097 struct net *net = sock_net(skb->sk);
1098
1099 if (nlmsg_len(h) < hdrlen)
1100 return -EINVAL;
1101
1102 if (h->nlmsg_flags & NLM_F_DUMP) {
1103 if (nlmsg_attrlen(h, hdrlen)) {
1104 struct nlattr *attr;
1105 attr = nlmsg_find_attr(h, hdrlen,
1106 INET_DIAG_REQ_BYTECODE);
1107 if (attr == NULL ||
1108 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
1109 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
1110 return -EINVAL;
1111 }
1112 {
1113 struct netlink_dump_control c = {
1114 .dump = inet_diag_dump,
1115 };
1116 return netlink_dump_start(net->diag_nlsk, skb, h, &c);
1117 }
1118 }
1119
1120 return inet_diag_get_exact(skb, h, nlmsg_data(h));
1121 }
1122
1123 static const struct sock_diag_handler inet_diag_handler = {
1124 .family = AF_INET,
1125 .dump = inet_diag_handler_dump,
1126 };
1127
1128 static const struct sock_diag_handler inet6_diag_handler = {
1129 .family = AF_INET6,
1130 .dump = inet_diag_handler_dump,
1131 };
1132
1133 int inet_diag_register(const struct inet_diag_handler *h)
1134 {
1135 const __u16 type = h->idiag_type;
1136 int err = -EINVAL;
1137
1138 if (type >= IPPROTO_MAX)
1139 goto out;
1140
1141 mutex_lock(&inet_diag_table_mutex);
1142 err = -EEXIST;
1143 if (inet_diag_table[type] == NULL) {
1144 inet_diag_table[type] = h;
1145 err = 0;
1146 }
1147 mutex_unlock(&inet_diag_table_mutex);
1148 out:
1149 return err;
1150 }
1151 EXPORT_SYMBOL_GPL(inet_diag_register);
1152
1153 void inet_diag_unregister(const struct inet_diag_handler *h)
1154 {
1155 const __u16 type = h->idiag_type;
1156
1157 if (type >= IPPROTO_MAX)
1158 return;
1159
1160 mutex_lock(&inet_diag_table_mutex);
1161 inet_diag_table[type] = NULL;
1162 mutex_unlock(&inet_diag_table_mutex);
1163 }
1164 EXPORT_SYMBOL_GPL(inet_diag_unregister);
1165
1166 static int __init inet_diag_init(void)
1167 {
1168 const int inet_diag_table_size = (IPPROTO_MAX *
1169 sizeof(struct inet_diag_handler *));
1170 int err = -ENOMEM;
1171
1172 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1173 if (!inet_diag_table)
1174 goto out;
1175
1176 err = sock_diag_register(&inet_diag_handler);
1177 if (err)
1178 goto out_free_nl;
1179
1180 err = sock_diag_register(&inet6_diag_handler);
1181 if (err)
1182 goto out_free_inet;
1183
1184 sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1185 out:
1186 return err;
1187
1188 out_free_inet:
1189 sock_diag_unregister(&inet_diag_handler);
1190 out_free_nl:
1191 kfree(inet_diag_table);
1192 goto out;
1193 }
1194
1195 static void __exit inet_diag_exit(void)
1196 {
1197 sock_diag_unregister(&inet6_diag_handler);
1198 sock_diag_unregister(&inet_diag_handler);
1199 sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1200 kfree(inet_diag_table);
1201 }
1202
1203 module_init(inet_diag_init);
1204 module_exit(inet_diag_exit);
1205 MODULE_LICENSE("GPL");
1206 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1207 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);
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