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