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Merge branch 'for_3.8-rc1' into v4l_for_linus
[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 r->id.idiag_src[0] = inet->inet_rcv_saddr;
110 r->id.idiag_dst[0] = inet->inet_daddr;
111
112 /* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
113 * hence this needs to be included regardless of socket family.
114 */
115 if (ext & (1 << (INET_DIAG_TOS - 1)))
116 if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0)
117 goto errout;
118
119 #if IS_ENABLED(CONFIG_IPV6)
120 if (r->idiag_family == AF_INET6) {
121 const struct ipv6_pinfo *np = inet6_sk(sk);
122
123 *(struct in6_addr *)r->id.idiag_src = np->rcv_saddr;
124 *(struct in6_addr *)r->id.idiag_dst = np->daddr;
125
126 if (ext & (1 << (INET_DIAG_TCLASS - 1)))
127 if (nla_put_u8(skb, INET_DIAG_TCLASS, np->tclass) < 0)
128 goto errout;
129 }
130 #endif
131
132 r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
133 r->idiag_inode = sock_i_ino(sk);
134
135 if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
136 struct inet_diag_meminfo minfo = {
137 .idiag_rmem = sk_rmem_alloc_get(sk),
138 .idiag_wmem = sk->sk_wmem_queued,
139 .idiag_fmem = sk->sk_forward_alloc,
140 .idiag_tmem = sk_wmem_alloc_get(sk),
141 };
142
143 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
144 goto errout;
145 }
146
147 if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
148 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
149 goto errout;
150
151 if (icsk == NULL) {
152 handler->idiag_get_info(sk, r, NULL);
153 goto out;
154 }
155
156 #define EXPIRES_IN_MS(tmo) DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
157
158 if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
159 r->idiag_timer = 1;
160 r->idiag_retrans = icsk->icsk_retransmits;
161 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
162 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
163 r->idiag_timer = 4;
164 r->idiag_retrans = icsk->icsk_probes_out;
165 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
166 } else if (timer_pending(&sk->sk_timer)) {
167 r->idiag_timer = 2;
168 r->idiag_retrans = icsk->icsk_probes_out;
169 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
170 } else {
171 r->idiag_timer = 0;
172 r->idiag_expires = 0;
173 }
174 #undef EXPIRES_IN_MS
175
176 if (ext & (1 << (INET_DIAG_INFO - 1))) {
177 attr = nla_reserve(skb, INET_DIAG_INFO,
178 sizeof(struct tcp_info));
179 if (!attr)
180 goto errout;
181
182 info = nla_data(attr);
183 }
184
185 if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops)
186 if (nla_put_string(skb, INET_DIAG_CONG,
187 icsk->icsk_ca_ops->name) < 0)
188 goto errout;
189
190 handler->idiag_get_info(sk, r, info);
191
192 if (sk->sk_state < TCP_TIME_WAIT &&
193 icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
194 icsk->icsk_ca_ops->get_info(sk, ext, skb);
195
196 out:
197 return nlmsg_end(skb, nlh);
198
199 errout:
200 nlmsg_cancel(skb, nlh);
201 return -EMSGSIZE;
202 }
203 EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
204
205 static int inet_csk_diag_fill(struct sock *sk,
206 struct sk_buff *skb, struct inet_diag_req_v2 *req,
207 struct user_namespace *user_ns,
208 u32 portid, u32 seq, u16 nlmsg_flags,
209 const struct nlmsghdr *unlh)
210 {
211 return inet_sk_diag_fill(sk, inet_csk(sk),
212 skb, req, user_ns, portid, seq, nlmsg_flags, unlh);
213 }
214
215 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw,
216 struct sk_buff *skb, struct inet_diag_req_v2 *req,
217 u32 portid, u32 seq, u16 nlmsg_flags,
218 const struct nlmsghdr *unlh)
219 {
220 long tmo;
221 struct inet_diag_msg *r;
222 struct nlmsghdr *nlh;
223
224 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
225 nlmsg_flags);
226 if (!nlh)
227 return -EMSGSIZE;
228
229 r = nlmsg_data(nlh);
230 BUG_ON(tw->tw_state != TCP_TIME_WAIT);
231
232 tmo = tw->tw_ttd - jiffies;
233 if (tmo < 0)
234 tmo = 0;
235
236 r->idiag_family = tw->tw_family;
237 r->idiag_retrans = 0;
238 r->id.idiag_if = tw->tw_bound_dev_if;
239 sock_diag_save_cookie(tw, r->id.idiag_cookie);
240 r->id.idiag_sport = tw->tw_sport;
241 r->id.idiag_dport = tw->tw_dport;
242 r->id.idiag_src[0] = tw->tw_rcv_saddr;
243 r->id.idiag_dst[0] = tw->tw_daddr;
244 r->idiag_state = tw->tw_substate;
245 r->idiag_timer = 3;
246 r->idiag_expires = DIV_ROUND_UP(tmo * 1000, HZ);
247 r->idiag_rqueue = 0;
248 r->idiag_wqueue = 0;
249 r->idiag_uid = 0;
250 r->idiag_inode = 0;
251 #if IS_ENABLED(CONFIG_IPV6)
252 if (tw->tw_family == AF_INET6) {
253 const struct inet6_timewait_sock *tw6 =
254 inet6_twsk((struct sock *)tw);
255
256 *(struct in6_addr *)r->id.idiag_src = tw6->tw_v6_rcv_saddr;
257 *(struct in6_addr *)r->id.idiag_dst = tw6->tw_v6_daddr;
258 }
259 #endif
260
261 return nlmsg_end(skb, nlh);
262 }
263
264 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
265 struct inet_diag_req_v2 *r,
266 struct user_namespace *user_ns,
267 u32 portid, u32 seq, u16 nlmsg_flags,
268 const struct nlmsghdr *unlh)
269 {
270 if (sk->sk_state == TCP_TIME_WAIT)
271 return inet_twsk_diag_fill((struct inet_timewait_sock *)sk,
272 skb, r, portid, seq, nlmsg_flags,
273 unlh);
274 return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq, nlmsg_flags, unlh);
275 }
276
277 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *in_skb,
278 const struct nlmsghdr *nlh, struct inet_diag_req_v2 *req)
279 {
280 int err;
281 struct sock *sk;
282 struct sk_buff *rep;
283 struct net *net = sock_net(in_skb->sk);
284
285 err = -EINVAL;
286 if (req->sdiag_family == AF_INET) {
287 sk = inet_lookup(net, hashinfo, req->id.idiag_dst[0],
288 req->id.idiag_dport, req->id.idiag_src[0],
289 req->id.idiag_sport, req->id.idiag_if);
290 }
291 #if IS_ENABLED(CONFIG_IPV6)
292 else if (req->sdiag_family == AF_INET6) {
293 sk = inet6_lookup(net, hashinfo,
294 (struct in6_addr *)req->id.idiag_dst,
295 req->id.idiag_dport,
296 (struct in6_addr *)req->id.idiag_src,
297 req->id.idiag_sport,
298 req->id.idiag_if);
299 }
300 #endif
301 else {
302 goto out_nosk;
303 }
304
305 err = -ENOENT;
306 if (sk == NULL)
307 goto out_nosk;
308
309 err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
310 if (err)
311 goto out;
312
313 rep = nlmsg_new(sizeof(struct inet_diag_msg) +
314 sizeof(struct inet_diag_meminfo) +
315 sizeof(struct tcp_info) + 64, GFP_KERNEL);
316 if (!rep) {
317 err = -ENOMEM;
318 goto out;
319 }
320
321 err = sk_diag_fill(sk, rep, req,
322 sk_user_ns(NETLINK_CB(in_skb).ssk),
323 NETLINK_CB(in_skb).portid,
324 nlh->nlmsg_seq, 0, nlh);
325 if (err < 0) {
326 WARN_ON(err == -EMSGSIZE);
327 nlmsg_free(rep);
328 goto out;
329 }
330 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
331 MSG_DONTWAIT);
332 if (err > 0)
333 err = 0;
334
335 out:
336 if (sk) {
337 if (sk->sk_state == TCP_TIME_WAIT)
338 inet_twsk_put((struct inet_timewait_sock *)sk);
339 else
340 sock_put(sk);
341 }
342 out_nosk:
343 return err;
344 }
345 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
346
347 static int inet_diag_get_exact(struct sk_buff *in_skb,
348 const struct nlmsghdr *nlh,
349 struct inet_diag_req_v2 *req)
350 {
351 const struct inet_diag_handler *handler;
352 int err;
353
354 handler = inet_diag_lock_handler(req->sdiag_protocol);
355 if (IS_ERR(handler))
356 err = PTR_ERR(handler);
357 else
358 err = handler->dump_one(in_skb, nlh, req);
359 inet_diag_unlock_handler(handler);
360
361 return err;
362 }
363
364 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
365 {
366 int words = bits >> 5;
367
368 bits &= 0x1f;
369
370 if (words) {
371 if (memcmp(a1, a2, words << 2))
372 return 0;
373 }
374 if (bits) {
375 __be32 w1, w2;
376 __be32 mask;
377
378 w1 = a1[words];
379 w2 = a2[words];
380
381 mask = htonl((0xffffffff) << (32 - bits));
382
383 if ((w1 ^ w2) & mask)
384 return 0;
385 }
386
387 return 1;
388 }
389
390
391 static int inet_diag_bc_run(const struct nlattr *_bc,
392 const struct inet_diag_entry *entry)
393 {
394 const void *bc = nla_data(_bc);
395 int len = nla_len(_bc);
396
397 while (len > 0) {
398 int yes = 1;
399 const struct inet_diag_bc_op *op = bc;
400
401 switch (op->code) {
402 case INET_DIAG_BC_NOP:
403 break;
404 case INET_DIAG_BC_JMP:
405 yes = 0;
406 break;
407 case INET_DIAG_BC_S_GE:
408 yes = entry->sport >= op[1].no;
409 break;
410 case INET_DIAG_BC_S_LE:
411 yes = entry->sport <= op[1].no;
412 break;
413 case INET_DIAG_BC_D_GE:
414 yes = entry->dport >= op[1].no;
415 break;
416 case INET_DIAG_BC_D_LE:
417 yes = entry->dport <= op[1].no;
418 break;
419 case INET_DIAG_BC_AUTO:
420 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
421 break;
422 case INET_DIAG_BC_S_COND:
423 case INET_DIAG_BC_D_COND: {
424 struct inet_diag_hostcond *cond;
425 __be32 *addr;
426
427 cond = (struct inet_diag_hostcond *)(op + 1);
428 if (cond->port != -1 &&
429 cond->port != (op->code == INET_DIAG_BC_S_COND ?
430 entry->sport : entry->dport)) {
431 yes = 0;
432 break;
433 }
434
435 if (op->code == INET_DIAG_BC_S_COND)
436 addr = entry->saddr;
437 else
438 addr = entry->daddr;
439
440 if (cond->family != AF_UNSPEC &&
441 cond->family != entry->family) {
442 if (entry->family == AF_INET6 &&
443 cond->family == AF_INET) {
444 if (addr[0] == 0 && addr[1] == 0 &&
445 addr[2] == htonl(0xffff) &&
446 bitstring_match(addr + 3,
447 cond->addr,
448 cond->prefix_len))
449 break;
450 }
451 yes = 0;
452 break;
453 }
454
455 if (cond->prefix_len == 0)
456 break;
457 if (bitstring_match(addr, cond->addr,
458 cond->prefix_len))
459 break;
460 yes = 0;
461 break;
462 }
463 }
464
465 if (yes) {
466 len -= op->yes;
467 bc += op->yes;
468 } else {
469 len -= op->no;
470 bc += op->no;
471 }
472 }
473 return len == 0;
474 }
475
476 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
477 {
478 struct inet_diag_entry entry;
479 struct inet_sock *inet = inet_sk(sk);
480
481 if (bc == NULL)
482 return 1;
483
484 entry.family = sk->sk_family;
485 #if IS_ENABLED(CONFIG_IPV6)
486 if (entry.family == AF_INET6) {
487 struct ipv6_pinfo *np = inet6_sk(sk);
488
489 entry.saddr = np->rcv_saddr.s6_addr32;
490 entry.daddr = np->daddr.s6_addr32;
491 } else
492 #endif
493 {
494 entry.saddr = &inet->inet_rcv_saddr;
495 entry.daddr = &inet->inet_daddr;
496 }
497 entry.sport = inet->inet_num;
498 entry.dport = ntohs(inet->inet_dport);
499 entry.userlocks = sk->sk_userlocks;
500
501 return inet_diag_bc_run(bc, &entry);
502 }
503 EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
504
505 static int valid_cc(const void *bc, int len, int cc)
506 {
507 while (len >= 0) {
508 const struct inet_diag_bc_op *op = bc;
509
510 if (cc > len)
511 return 0;
512 if (cc == len)
513 return 1;
514 if (op->yes < 4 || op->yes & 3)
515 return 0;
516 len -= op->yes;
517 bc += op->yes;
518 }
519 return 0;
520 }
521
522 /* Validate an inet_diag_hostcond. */
523 static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
524 int *min_len)
525 {
526 int addr_len;
527 struct inet_diag_hostcond *cond;
528
529 /* Check hostcond space. */
530 *min_len += sizeof(struct inet_diag_hostcond);
531 if (len < *min_len)
532 return false;
533 cond = (struct inet_diag_hostcond *)(op + 1);
534
535 /* Check address family and address length. */
536 switch (cond->family) {
537 case AF_UNSPEC:
538 addr_len = 0;
539 break;
540 case AF_INET:
541 addr_len = sizeof(struct in_addr);
542 break;
543 case AF_INET6:
544 addr_len = sizeof(struct in6_addr);
545 break;
546 default:
547 return false;
548 }
549 *min_len += addr_len;
550 if (len < *min_len)
551 return false;
552
553 /* Check prefix length (in bits) vs address length (in bytes). */
554 if (cond->prefix_len > 8 * addr_len)
555 return false;
556
557 return true;
558 }
559
560 /* Validate a port comparison operator. */
561 static inline bool valid_port_comparison(const struct inet_diag_bc_op *op,
562 int len, int *min_len)
563 {
564 /* Port comparisons put the port in a follow-on inet_diag_bc_op. */
565 *min_len += sizeof(struct inet_diag_bc_op);
566 if (len < *min_len)
567 return false;
568 return true;
569 }
570
571 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
572 {
573 const void *bc = bytecode;
574 int len = bytecode_len;
575
576 while (len > 0) {
577 const struct inet_diag_bc_op *op = bc;
578 int min_len = sizeof(struct inet_diag_bc_op);
579
580 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
581 switch (op->code) {
582 case INET_DIAG_BC_S_COND:
583 case INET_DIAG_BC_D_COND:
584 if (!valid_hostcond(bc, len, &min_len))
585 return -EINVAL;
586 break;
587 case INET_DIAG_BC_S_GE:
588 case INET_DIAG_BC_S_LE:
589 case INET_DIAG_BC_D_GE:
590 case INET_DIAG_BC_D_LE:
591 if (!valid_port_comparison(bc, len, &min_len))
592 return -EINVAL;
593 break;
594 case INET_DIAG_BC_AUTO:
595 case INET_DIAG_BC_JMP:
596 case INET_DIAG_BC_NOP:
597 break;
598 default:
599 return -EINVAL;
600 }
601
602 if (op->code != INET_DIAG_BC_NOP) {
603 if (op->no < min_len || op->no > len + 4 || op->no & 3)
604 return -EINVAL;
605 if (op->no < len &&
606 !valid_cc(bytecode, bytecode_len, len - op->no))
607 return -EINVAL;
608 }
609
610 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
611 return -EINVAL;
612 bc += op->yes;
613 len -= op->yes;
614 }
615 return len == 0 ? 0 : -EINVAL;
616 }
617
618 static int inet_csk_diag_dump(struct sock *sk,
619 struct sk_buff *skb,
620 struct netlink_callback *cb,
621 struct inet_diag_req_v2 *r,
622 const struct nlattr *bc)
623 {
624 if (!inet_diag_bc_sk(bc, sk))
625 return 0;
626
627 return inet_csk_diag_fill(sk, skb, r,
628 sk_user_ns(NETLINK_CB(cb->skb).ssk),
629 NETLINK_CB(cb->skb).portid,
630 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
631 }
632
633 static int inet_twsk_diag_dump(struct inet_timewait_sock *tw,
634 struct sk_buff *skb,
635 struct netlink_callback *cb,
636 struct inet_diag_req_v2 *r,
637 const struct nlattr *bc)
638 {
639 if (bc != NULL) {
640 struct inet_diag_entry entry;
641
642 entry.family = tw->tw_family;
643 #if IS_ENABLED(CONFIG_IPV6)
644 if (tw->tw_family == AF_INET6) {
645 struct inet6_timewait_sock *tw6 =
646 inet6_twsk((struct sock *)tw);
647 entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32;
648 entry.daddr = tw6->tw_v6_daddr.s6_addr32;
649 } else
650 #endif
651 {
652 entry.saddr = &tw->tw_rcv_saddr;
653 entry.daddr = &tw->tw_daddr;
654 }
655 entry.sport = tw->tw_num;
656 entry.dport = ntohs(tw->tw_dport);
657 entry.userlocks = 0;
658
659 if (!inet_diag_bc_run(bc, &entry))
660 return 0;
661 }
662
663 return inet_twsk_diag_fill(tw, skb, r,
664 NETLINK_CB(cb->skb).portid,
665 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
666 }
667
668 /* Get the IPv4, IPv6, or IPv4-mapped-IPv6 local and remote addresses
669 * from a request_sock. For IPv4-mapped-IPv6 we must map IPv4 to IPv6.
670 */
671 static inline void inet_diag_req_addrs(const struct sock *sk,
672 const struct request_sock *req,
673 struct inet_diag_entry *entry)
674 {
675 struct inet_request_sock *ireq = inet_rsk(req);
676
677 #if IS_ENABLED(CONFIG_IPV6)
678 if (sk->sk_family == AF_INET6) {
679 if (req->rsk_ops->family == AF_INET6) {
680 entry->saddr = inet6_rsk(req)->loc_addr.s6_addr32;
681 entry->daddr = inet6_rsk(req)->rmt_addr.s6_addr32;
682 } else if (req->rsk_ops->family == AF_INET) {
683 ipv6_addr_set_v4mapped(ireq->loc_addr,
684 &entry->saddr_storage);
685 ipv6_addr_set_v4mapped(ireq->rmt_addr,
686 &entry->daddr_storage);
687 entry->saddr = entry->saddr_storage.s6_addr32;
688 entry->daddr = entry->daddr_storage.s6_addr32;
689 }
690 } else
691 #endif
692 {
693 entry->saddr = &ireq->loc_addr;
694 entry->daddr = &ireq->rmt_addr;
695 }
696 }
697
698 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
699 struct request_sock *req,
700 struct user_namespace *user_ns,
701 u32 portid, u32 seq,
702 const struct nlmsghdr *unlh)
703 {
704 const struct inet_request_sock *ireq = inet_rsk(req);
705 struct inet_sock *inet = inet_sk(sk);
706 struct inet_diag_msg *r;
707 struct nlmsghdr *nlh;
708 long tmo;
709
710 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
711 NLM_F_MULTI);
712 if (!nlh)
713 return -EMSGSIZE;
714
715 r = nlmsg_data(nlh);
716 r->idiag_family = sk->sk_family;
717 r->idiag_state = TCP_SYN_RECV;
718 r->idiag_timer = 1;
719 r->idiag_retrans = req->retrans;
720
721 r->id.idiag_if = sk->sk_bound_dev_if;
722 sock_diag_save_cookie(req, r->id.idiag_cookie);
723
724 tmo = req->expires - jiffies;
725 if (tmo < 0)
726 tmo = 0;
727
728 r->id.idiag_sport = inet->inet_sport;
729 r->id.idiag_dport = ireq->rmt_port;
730 r->id.idiag_src[0] = ireq->loc_addr;
731 r->id.idiag_dst[0] = ireq->rmt_addr;
732 r->idiag_expires = jiffies_to_msecs(tmo);
733 r->idiag_rqueue = 0;
734 r->idiag_wqueue = 0;
735 r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
736 r->idiag_inode = 0;
737 #if IS_ENABLED(CONFIG_IPV6)
738 if (r->idiag_family == AF_INET6) {
739 struct inet_diag_entry entry;
740 inet_diag_req_addrs(sk, req, &entry);
741 memcpy(r->id.idiag_src, entry.saddr, sizeof(struct in6_addr));
742 memcpy(r->id.idiag_dst, entry.daddr, sizeof(struct in6_addr));
743 }
744 #endif
745
746 return nlmsg_end(skb, nlh);
747 }
748
749 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
750 struct netlink_callback *cb,
751 struct inet_diag_req_v2 *r,
752 const struct nlattr *bc)
753 {
754 struct inet_diag_entry entry;
755 struct inet_connection_sock *icsk = inet_csk(sk);
756 struct listen_sock *lopt;
757 struct inet_sock *inet = inet_sk(sk);
758 int j, s_j;
759 int reqnum, s_reqnum;
760 int err = 0;
761
762 s_j = cb->args[3];
763 s_reqnum = cb->args[4];
764
765 if (s_j > 0)
766 s_j--;
767
768 entry.family = sk->sk_family;
769
770 read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
771
772 lopt = icsk->icsk_accept_queue.listen_opt;
773 if (!lopt || !lopt->qlen)
774 goto out;
775
776 if (bc != NULL) {
777 entry.sport = inet->inet_num;
778 entry.userlocks = sk->sk_userlocks;
779 }
780
781 for (j = s_j; j < lopt->nr_table_entries; j++) {
782 struct request_sock *req, *head = lopt->syn_table[j];
783
784 reqnum = 0;
785 for (req = head; req; reqnum++, req = req->dl_next) {
786 struct inet_request_sock *ireq = inet_rsk(req);
787
788 if (reqnum < s_reqnum)
789 continue;
790 if (r->id.idiag_dport != ireq->rmt_port &&
791 r->id.idiag_dport)
792 continue;
793
794 if (bc) {
795 inet_diag_req_addrs(sk, req, &entry);
796 entry.dport = ntohs(ireq->rmt_port);
797
798 if (!inet_diag_bc_run(bc, &entry))
799 continue;
800 }
801
802 err = inet_diag_fill_req(skb, sk, req,
803 sk_user_ns(NETLINK_CB(cb->skb).ssk),
804 NETLINK_CB(cb->skb).portid,
805 cb->nlh->nlmsg_seq, cb->nlh);
806 if (err < 0) {
807 cb->args[3] = j + 1;
808 cb->args[4] = reqnum;
809 goto out;
810 }
811 }
812
813 s_reqnum = 0;
814 }
815
816 out:
817 read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
818
819 return err;
820 }
821
822 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
823 struct netlink_callback *cb, struct inet_diag_req_v2 *r, struct nlattr *bc)
824 {
825 int i, num;
826 int s_i, s_num;
827 struct net *net = sock_net(skb->sk);
828
829 s_i = cb->args[1];
830 s_num = num = cb->args[2];
831
832 if (cb->args[0] == 0) {
833 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
834 goto skip_listen_ht;
835
836 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
837 struct sock *sk;
838 struct hlist_nulls_node *node;
839 struct inet_listen_hashbucket *ilb;
840
841 num = 0;
842 ilb = &hashinfo->listening_hash[i];
843 spin_lock_bh(&ilb->lock);
844 sk_nulls_for_each(sk, node, &ilb->head) {
845 struct inet_sock *inet = inet_sk(sk);
846
847 if (!net_eq(sock_net(sk), net))
848 continue;
849
850 if (num < s_num) {
851 num++;
852 continue;
853 }
854
855 if (r->sdiag_family != AF_UNSPEC &&
856 sk->sk_family != r->sdiag_family)
857 goto next_listen;
858
859 if (r->id.idiag_sport != inet->inet_sport &&
860 r->id.idiag_sport)
861 goto next_listen;
862
863 if (!(r->idiag_states & TCPF_LISTEN) ||
864 r->id.idiag_dport ||
865 cb->args[3] > 0)
866 goto syn_recv;
867
868 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
869 spin_unlock_bh(&ilb->lock);
870 goto done;
871 }
872
873 syn_recv:
874 if (!(r->idiag_states & TCPF_SYN_RECV))
875 goto next_listen;
876
877 if (inet_diag_dump_reqs(skb, sk, cb, r, bc) < 0) {
878 spin_unlock_bh(&ilb->lock);
879 goto done;
880 }
881
882 next_listen:
883 cb->args[3] = 0;
884 cb->args[4] = 0;
885 ++num;
886 }
887 spin_unlock_bh(&ilb->lock);
888
889 s_num = 0;
890 cb->args[3] = 0;
891 cb->args[4] = 0;
892 }
893 skip_listen_ht:
894 cb->args[0] = 1;
895 s_i = num = s_num = 0;
896 }
897
898 if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
899 goto out;
900
901 for (i = s_i; i <= hashinfo->ehash_mask; i++) {
902 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
903 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
904 struct sock *sk;
905 struct hlist_nulls_node *node;
906
907 num = 0;
908
909 if (hlist_nulls_empty(&head->chain) &&
910 hlist_nulls_empty(&head->twchain))
911 continue;
912
913 if (i > s_i)
914 s_num = 0;
915
916 spin_lock_bh(lock);
917 sk_nulls_for_each(sk, node, &head->chain) {
918 struct inet_sock *inet = inet_sk(sk);
919
920 if (!net_eq(sock_net(sk), net))
921 continue;
922 if (num < s_num)
923 goto next_normal;
924 if (!(r->idiag_states & (1 << sk->sk_state)))
925 goto next_normal;
926 if (r->sdiag_family != AF_UNSPEC &&
927 sk->sk_family != r->sdiag_family)
928 goto next_normal;
929 if (r->id.idiag_sport != inet->inet_sport &&
930 r->id.idiag_sport)
931 goto next_normal;
932 if (r->id.idiag_dport != inet->inet_dport &&
933 r->id.idiag_dport)
934 goto next_normal;
935 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
936 spin_unlock_bh(lock);
937 goto done;
938 }
939 next_normal:
940 ++num;
941 }
942
943 if (r->idiag_states & TCPF_TIME_WAIT) {
944 struct inet_timewait_sock *tw;
945
946 inet_twsk_for_each(tw, node,
947 &head->twchain) {
948 if (!net_eq(twsk_net(tw), net))
949 continue;
950
951 if (num < s_num)
952 goto next_dying;
953 if (r->sdiag_family != AF_UNSPEC &&
954 tw->tw_family != r->sdiag_family)
955 goto next_dying;
956 if (r->id.idiag_sport != tw->tw_sport &&
957 r->id.idiag_sport)
958 goto next_dying;
959 if (r->id.idiag_dport != tw->tw_dport &&
960 r->id.idiag_dport)
961 goto next_dying;
962 if (inet_twsk_diag_dump(tw, skb, cb, r, bc) < 0) {
963 spin_unlock_bh(lock);
964 goto done;
965 }
966 next_dying:
967 ++num;
968 }
969 }
970 spin_unlock_bh(lock);
971 }
972
973 done:
974 cb->args[1] = i;
975 cb->args[2] = num;
976 out:
977 ;
978 }
979 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
980
981 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
982 struct inet_diag_req_v2 *r, struct nlattr *bc)
983 {
984 const struct inet_diag_handler *handler;
985 int err = 0;
986
987 handler = inet_diag_lock_handler(r->sdiag_protocol);
988 if (!IS_ERR(handler))
989 handler->dump(skb, cb, r, bc);
990 else
991 err = PTR_ERR(handler);
992 inet_diag_unlock_handler(handler);
993
994 return err ? : skb->len;
995 }
996
997 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
998 {
999 struct nlattr *bc = NULL;
1000 int hdrlen = sizeof(struct inet_diag_req_v2);
1001
1002 if (nlmsg_attrlen(cb->nlh, hdrlen))
1003 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1004
1005 return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
1006 }
1007
1008 static inline int inet_diag_type2proto(int type)
1009 {
1010 switch (type) {
1011 case TCPDIAG_GETSOCK:
1012 return IPPROTO_TCP;
1013 case DCCPDIAG_GETSOCK:
1014 return IPPROTO_DCCP;
1015 default:
1016 return 0;
1017 }
1018 }
1019
1020 static int inet_diag_dump_compat(struct sk_buff *skb, struct netlink_callback *cb)
1021 {
1022 struct inet_diag_req *rc = nlmsg_data(cb->nlh);
1023 struct inet_diag_req_v2 req;
1024 struct nlattr *bc = NULL;
1025 int hdrlen = sizeof(struct inet_diag_req);
1026
1027 req.sdiag_family = AF_UNSPEC; /* compatibility */
1028 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
1029 req.idiag_ext = rc->idiag_ext;
1030 req.idiag_states = rc->idiag_states;
1031 req.id = rc->id;
1032
1033 if (nlmsg_attrlen(cb->nlh, hdrlen))
1034 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1035
1036 return __inet_diag_dump(skb, cb, &req, bc);
1037 }
1038
1039 static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
1040 const struct nlmsghdr *nlh)
1041 {
1042 struct inet_diag_req *rc = nlmsg_data(nlh);
1043 struct inet_diag_req_v2 req;
1044
1045 req.sdiag_family = rc->idiag_family;
1046 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
1047 req.idiag_ext = rc->idiag_ext;
1048 req.idiag_states = rc->idiag_states;
1049 req.id = rc->id;
1050
1051 return inet_diag_get_exact(in_skb, nlh, &req);
1052 }
1053
1054 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
1055 {
1056 int hdrlen = sizeof(struct inet_diag_req);
1057 struct net *net = sock_net(skb->sk);
1058
1059 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
1060 nlmsg_len(nlh) < hdrlen)
1061 return -EINVAL;
1062
1063 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1064 if (nlmsg_attrlen(nlh, hdrlen)) {
1065 struct nlattr *attr;
1066
1067 attr = nlmsg_find_attr(nlh, hdrlen,
1068 INET_DIAG_REQ_BYTECODE);
1069 if (attr == NULL ||
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_compat,
1077 };
1078 return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
1079 }
1080 }
1081
1082 return inet_diag_get_exact_compat(skb, nlh);
1083 }
1084
1085 static int inet_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
1086 {
1087 int hdrlen = sizeof(struct inet_diag_req_v2);
1088 struct net *net = sock_net(skb->sk);
1089
1090 if (nlmsg_len(h) < hdrlen)
1091 return -EINVAL;
1092
1093 if (h->nlmsg_flags & NLM_F_DUMP) {
1094 if (nlmsg_attrlen(h, hdrlen)) {
1095 struct nlattr *attr;
1096 attr = nlmsg_find_attr(h, hdrlen,
1097 INET_DIAG_REQ_BYTECODE);
1098 if (attr == NULL ||
1099 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
1100 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
1101 return -EINVAL;
1102 }
1103 {
1104 struct netlink_dump_control c = {
1105 .dump = inet_diag_dump,
1106 };
1107 return netlink_dump_start(net->diag_nlsk, skb, h, &c);
1108 }
1109 }
1110
1111 return inet_diag_get_exact(skb, h, nlmsg_data(h));
1112 }
1113
1114 static const struct sock_diag_handler inet_diag_handler = {
1115 .family = AF_INET,
1116 .dump = inet_diag_handler_dump,
1117 };
1118
1119 static const struct sock_diag_handler inet6_diag_handler = {
1120 .family = AF_INET6,
1121 .dump = inet_diag_handler_dump,
1122 };
1123
1124 int inet_diag_register(const struct inet_diag_handler *h)
1125 {
1126 const __u16 type = h->idiag_type;
1127 int err = -EINVAL;
1128
1129 if (type >= IPPROTO_MAX)
1130 goto out;
1131
1132 mutex_lock(&inet_diag_table_mutex);
1133 err = -EEXIST;
1134 if (inet_diag_table[type] == NULL) {
1135 inet_diag_table[type] = h;
1136 err = 0;
1137 }
1138 mutex_unlock(&inet_diag_table_mutex);
1139 out:
1140 return err;
1141 }
1142 EXPORT_SYMBOL_GPL(inet_diag_register);
1143
1144 void inet_diag_unregister(const struct inet_diag_handler *h)
1145 {
1146 const __u16 type = h->idiag_type;
1147
1148 if (type >= IPPROTO_MAX)
1149 return;
1150
1151 mutex_lock(&inet_diag_table_mutex);
1152 inet_diag_table[type] = NULL;
1153 mutex_unlock(&inet_diag_table_mutex);
1154 }
1155 EXPORT_SYMBOL_GPL(inet_diag_unregister);
1156
1157 static int __init inet_diag_init(void)
1158 {
1159 const int inet_diag_table_size = (IPPROTO_MAX *
1160 sizeof(struct inet_diag_handler *));
1161 int err = -ENOMEM;
1162
1163 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1164 if (!inet_diag_table)
1165 goto out;
1166
1167 err = sock_diag_register(&inet_diag_handler);
1168 if (err)
1169 goto out_free_nl;
1170
1171 err = sock_diag_register(&inet6_diag_handler);
1172 if (err)
1173 goto out_free_inet;
1174
1175 sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1176 out:
1177 return err;
1178
1179 out_free_inet:
1180 sock_diag_unregister(&inet_diag_handler);
1181 out_free_nl:
1182 kfree(inet_diag_table);
1183 goto out;
1184 }
1185
1186 static void __exit inet_diag_exit(void)
1187 {
1188 sock_diag_unregister(&inet6_diag_handler);
1189 sock_diag_unregister(&inet_diag_handler);
1190 sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1191 kfree(inet_diag_table);
1192 }
1193
1194 module_init(inet_diag_init);
1195 module_exit(inet_diag_exit);
1196 MODULE_LICENSE("GPL");
1197 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1198 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);
Linux kernel - Deliverables
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