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Linux 3.8-rc7
[cris-mirror.git] / net / ipv4 / inet_diag.c
blob7afa2c3c788f184457e45899a7065a9786d26df7
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 if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown))
113 goto errout;
114
115 /* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
116 * hence this needs to be included regardless of socket family.
117 */
118 if (ext & (1 << (INET_DIAG_TOS - 1)))
119 if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0)
120 goto errout;
121
122 #if IS_ENABLED(CONFIG_IPV6)
123 if (r->idiag_family == AF_INET6) {
124 const struct ipv6_pinfo *np = inet6_sk(sk);
125
126 *(struct in6_addr *)r->id.idiag_src = np->rcv_saddr;
127 *(struct in6_addr *)r->id.idiag_dst = np->daddr;
128
129 if (ext & (1 << (INET_DIAG_TCLASS - 1)))
130 if (nla_put_u8(skb, INET_DIAG_TCLASS, np->tclass) < 0)
131 goto errout;
132 }
133 #endif
134
135 r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
136 r->idiag_inode = sock_i_ino(sk);
137
138 if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
139 struct inet_diag_meminfo minfo = {
140 .idiag_rmem = sk_rmem_alloc_get(sk),
141 .idiag_wmem = sk->sk_wmem_queued,
142 .idiag_fmem = sk->sk_forward_alloc,
143 .idiag_tmem = sk_wmem_alloc_get(sk),
144 };
145
146 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
147 goto errout;
148 }
149
150 if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
151 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
152 goto errout;
153
154 if (icsk == NULL) {
155 handler->idiag_get_info(sk, r, NULL);
156 goto out;
157 }
158
159 #define EXPIRES_IN_MS(tmo) DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
160
161 if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
162 r->idiag_timer = 1;
163 r->idiag_retrans = icsk->icsk_retransmits;
164 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
165 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
166 r->idiag_timer = 4;
167 r->idiag_retrans = icsk->icsk_probes_out;
168 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
169 } else if (timer_pending(&sk->sk_timer)) {
170 r->idiag_timer = 2;
171 r->idiag_retrans = icsk->icsk_probes_out;
172 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
173 } else {
174 r->idiag_timer = 0;
175 r->idiag_expires = 0;
176 }
177 #undef EXPIRES_IN_MS
178
179 if (ext & (1 << (INET_DIAG_INFO - 1))) {
180 attr = nla_reserve(skb, INET_DIAG_INFO,
181 sizeof(struct tcp_info));
182 if (!attr)
183 goto errout;
184
185 info = nla_data(attr);
186 }
187
188 if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops)
189 if (nla_put_string(skb, INET_DIAG_CONG,
190 icsk->icsk_ca_ops->name) < 0)
191 goto errout;
192
193 handler->idiag_get_info(sk, r, info);
194
195 if (sk->sk_state < TCP_TIME_WAIT &&
196 icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
197 icsk->icsk_ca_ops->get_info(sk, ext, skb);
198
199 out:
200 return nlmsg_end(skb, nlh);
201
202 errout:
203 nlmsg_cancel(skb, nlh);
204 return -EMSGSIZE;
205 }
206 EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
207
208 static int inet_csk_diag_fill(struct sock *sk,
209 struct sk_buff *skb, struct inet_diag_req_v2 *req,
210 struct user_namespace *user_ns,
211 u32 portid, u32 seq, u16 nlmsg_flags,
212 const struct nlmsghdr *unlh)
213 {
214 return inet_sk_diag_fill(sk, inet_csk(sk),
215 skb, req, user_ns, portid, seq, nlmsg_flags, unlh);
216 }
217
218 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw,
219 struct sk_buff *skb, struct inet_diag_req_v2 *req,
220 u32 portid, u32 seq, u16 nlmsg_flags,
221 const struct nlmsghdr *unlh)
222 {
223 long tmo;
224 struct inet_diag_msg *r;
225 struct nlmsghdr *nlh;
226
227 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
228 nlmsg_flags);
229 if (!nlh)
230 return -EMSGSIZE;
231
232 r = nlmsg_data(nlh);
233 BUG_ON(tw->tw_state != TCP_TIME_WAIT);
234
235 tmo = tw->tw_ttd - jiffies;
236 if (tmo < 0)
237 tmo = 0;
238
239 r->idiag_family = tw->tw_family;
240 r->idiag_retrans = 0;
241 r->id.idiag_if = tw->tw_bound_dev_if;
242 sock_diag_save_cookie(tw, r->id.idiag_cookie);
243 r->id.idiag_sport = tw->tw_sport;
244 r->id.idiag_dport = tw->tw_dport;
245 r->id.idiag_src[0] = tw->tw_rcv_saddr;
246 r->id.idiag_dst[0] = tw->tw_daddr;
247 r->idiag_state = tw->tw_substate;
248 r->idiag_timer = 3;
249 r->idiag_expires = DIV_ROUND_UP(tmo * 1000, HZ);
250 r->idiag_rqueue = 0;
251 r->idiag_wqueue = 0;
252 r->idiag_uid = 0;
253 r->idiag_inode = 0;
254 #if IS_ENABLED(CONFIG_IPV6)
255 if (tw->tw_family == AF_INET6) {
256 const struct inet6_timewait_sock *tw6 =
257 inet6_twsk((struct sock *)tw);
258
259 *(struct in6_addr *)r->id.idiag_src = tw6->tw_v6_rcv_saddr;
260 *(struct in6_addr *)r->id.idiag_dst = tw6->tw_v6_daddr;
261 }
262 #endif
263
264 return nlmsg_end(skb, nlh);
265 }
266
267 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
268 struct inet_diag_req_v2 *r,
269 struct user_namespace *user_ns,
270 u32 portid, u32 seq, u16 nlmsg_flags,
271 const struct nlmsghdr *unlh)
272 {
273 if (sk->sk_state == TCP_TIME_WAIT)
274 return inet_twsk_diag_fill((struct inet_timewait_sock *)sk,
275 skb, r, portid, seq, nlmsg_flags,
276 unlh);
277 return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq, nlmsg_flags, unlh);
278 }
279
280 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *in_skb,
281 const struct nlmsghdr *nlh, struct inet_diag_req_v2 *req)
282 {
283 int err;
284 struct sock *sk;
285 struct sk_buff *rep;
286 struct net *net = sock_net(in_skb->sk);
287
288 err = -EINVAL;
289 if (req->sdiag_family == AF_INET) {
290 sk = inet_lookup(net, hashinfo, req->id.idiag_dst[0],
291 req->id.idiag_dport, req->id.idiag_src[0],
292 req->id.idiag_sport, req->id.idiag_if);
293 }
294 #if IS_ENABLED(CONFIG_IPV6)
295 else if (req->sdiag_family == AF_INET6) {
296 sk = inet6_lookup(net, hashinfo,
297 (struct in6_addr *)req->id.idiag_dst,
298 req->id.idiag_dport,
299 (struct in6_addr *)req->id.idiag_src,
300 req->id.idiag_sport,
301 req->id.idiag_if);
302 }
303 #endif
304 else {
305 goto out_nosk;
306 }
307
308 err = -ENOENT;
309 if (sk == NULL)
310 goto out_nosk;
311
312 err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
313 if (err)
314 goto out;
315
316 rep = nlmsg_new(sizeof(struct inet_diag_msg) +
317 sizeof(struct inet_diag_meminfo) +
318 sizeof(struct tcp_info) + 64, GFP_KERNEL);
319 if (!rep) {
320 err = -ENOMEM;
321 goto out;
322 }
323
324 err = sk_diag_fill(sk, rep, req,
325 sk_user_ns(NETLINK_CB(in_skb).ssk),
326 NETLINK_CB(in_skb).portid,
327 nlh->nlmsg_seq, 0, nlh);
328 if (err < 0) {
329 WARN_ON(err == -EMSGSIZE);
330 nlmsg_free(rep);
331 goto out;
332 }
333 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
334 MSG_DONTWAIT);
335 if (err > 0)
336 err = 0;
337
338 out:
339 if (sk) {
340 if (sk->sk_state == TCP_TIME_WAIT)
341 inet_twsk_put((struct inet_timewait_sock *)sk);
342 else
343 sock_put(sk);
344 }
345 out_nosk:
346 return err;
347 }
348 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
349
350 static int inet_diag_get_exact(struct sk_buff *in_skb,
351 const struct nlmsghdr *nlh,
352 struct inet_diag_req_v2 *req)
353 {
354 const struct inet_diag_handler *handler;
355 int err;
356
357 handler = inet_diag_lock_handler(req->sdiag_protocol);
358 if (IS_ERR(handler))
359 err = PTR_ERR(handler);
360 else
361 err = handler->dump_one(in_skb, nlh, req);
362 inet_diag_unlock_handler(handler);
363
364 return err;
365 }
366
367 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
368 {
369 int words = bits >> 5;
370
371 bits &= 0x1f;
372
373 if (words) {
374 if (memcmp(a1, a2, words << 2))
375 return 0;
376 }
377 if (bits) {
378 __be32 w1, w2;
379 __be32 mask;
380
381 w1 = a1[words];
382 w2 = a2[words];
383
384 mask = htonl((0xffffffff) << (32 - bits));
385
386 if ((w1 ^ w2) & mask)
387 return 0;
388 }
389
390 return 1;
391 }
392
393
394 static int inet_diag_bc_run(const struct nlattr *_bc,
395 const struct inet_diag_entry *entry)
396 {
397 const void *bc = nla_data(_bc);
398 int len = nla_len(_bc);
399
400 while (len > 0) {
401 int yes = 1;
402 const struct inet_diag_bc_op *op = bc;
403
404 switch (op->code) {
405 case INET_DIAG_BC_NOP:
406 break;
407 case INET_DIAG_BC_JMP:
408 yes = 0;
409 break;
410 case INET_DIAG_BC_S_GE:
411 yes = entry->sport >= op[1].no;
412 break;
413 case INET_DIAG_BC_S_LE:
414 yes = entry->sport <= op[1].no;
415 break;
416 case INET_DIAG_BC_D_GE:
417 yes = entry->dport >= op[1].no;
418 break;
419 case INET_DIAG_BC_D_LE:
420 yes = entry->dport <= op[1].no;
421 break;
422 case INET_DIAG_BC_AUTO:
423 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
424 break;
425 case INET_DIAG_BC_S_COND:
426 case INET_DIAG_BC_D_COND: {
427 struct inet_diag_hostcond *cond;
428 __be32 *addr;
429
430 cond = (struct inet_diag_hostcond *)(op + 1);
431 if (cond->port != -1 &&
432 cond->port != (op->code == INET_DIAG_BC_S_COND ?
433 entry->sport : entry->dport)) {
434 yes = 0;
435 break;
436 }
437
438 if (op->code == INET_DIAG_BC_S_COND)
439 addr = entry->saddr;
440 else
441 addr = entry->daddr;
442
443 if (cond->family != AF_UNSPEC &&
444 cond->family != entry->family) {
445 if (entry->family == AF_INET6 &&
446 cond->family == AF_INET) {
447 if (addr[0] == 0 && addr[1] == 0 &&
448 addr[2] == htonl(0xffff) &&
449 bitstring_match(addr + 3,
450 cond->addr,
451 cond->prefix_len))
452 break;
453 }
454 yes = 0;
455 break;
456 }
457
458 if (cond->prefix_len == 0)
459 break;
460 if (bitstring_match(addr, cond->addr,
461 cond->prefix_len))
462 break;
463 yes = 0;
464 break;
465 }
466 }
467
468 if (yes) {
469 len -= op->yes;
470 bc += op->yes;
471 } else {
472 len -= op->no;
473 bc += op->no;
474 }
475 }
476 return len == 0;
477 }
478
479 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
480 {
481 struct inet_diag_entry entry;
482 struct inet_sock *inet = inet_sk(sk);
483
484 if (bc == NULL)
485 return 1;
486
487 entry.family = sk->sk_family;
488 #if IS_ENABLED(CONFIG_IPV6)
489 if (entry.family == AF_INET6) {
490 struct ipv6_pinfo *np = inet6_sk(sk);
491
492 entry.saddr = np->rcv_saddr.s6_addr32;
493 entry.daddr = np->daddr.s6_addr32;
494 } else
495 #endif
496 {
497 entry.saddr = &inet->inet_rcv_saddr;
498 entry.daddr = &inet->inet_daddr;
499 }
500 entry.sport = inet->inet_num;
501 entry.dport = ntohs(inet->inet_dport);
502 entry.userlocks = sk->sk_userlocks;
503
504 return inet_diag_bc_run(bc, &entry);
505 }
506 EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
507
508 static int valid_cc(const void *bc, int len, int cc)
509 {
510 while (len >= 0) {
511 const struct inet_diag_bc_op *op = bc;
512
513 if (cc > len)
514 return 0;
515 if (cc == len)
516 return 1;
517 if (op->yes < 4 || op->yes & 3)
518 return 0;
519 len -= op->yes;
520 bc += op->yes;
521 }
522 return 0;
523 }
524
525 /* Validate an inet_diag_hostcond. */
526 static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
527 int *min_len)
528 {
529 int addr_len;
530 struct inet_diag_hostcond *cond;
531
532 /* Check hostcond space. */
533 *min_len += sizeof(struct inet_diag_hostcond);
534 if (len < *min_len)
535 return false;
536 cond = (struct inet_diag_hostcond *)(op + 1);
537
538 /* Check address family and address length. */
539 switch (cond->family) {
540 case AF_UNSPEC:
541 addr_len = 0;
542 break;
543 case AF_INET:
544 addr_len = sizeof(struct in_addr);
545 break;
546 case AF_INET6:
547 addr_len = sizeof(struct in6_addr);
548 break;
549 default:
550 return false;
551 }
552 *min_len += addr_len;
553 if (len < *min_len)
554 return false;
555
556 /* Check prefix length (in bits) vs address length (in bytes). */
557 if (cond->prefix_len > 8 * addr_len)
558 return false;
559
560 return true;
561 }
562
563 /* Validate a port comparison operator. */
564 static inline bool valid_port_comparison(const struct inet_diag_bc_op *op,
565 int len, int *min_len)
566 {
567 /* Port comparisons put the port in a follow-on inet_diag_bc_op. */
568 *min_len += sizeof(struct inet_diag_bc_op);
569 if (len < *min_len)
570 return false;
571 return true;
572 }
573
574 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
575 {
576 const void *bc = bytecode;
577 int len = bytecode_len;
578
579 while (len > 0) {
580 const struct inet_diag_bc_op *op = bc;
581 int min_len = sizeof(struct inet_diag_bc_op);
582
583 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
584 switch (op->code) {
585 case INET_DIAG_BC_S_COND:
586 case INET_DIAG_BC_D_COND:
587 if (!valid_hostcond(bc, len, &min_len))
588 return -EINVAL;
589 break;
590 case INET_DIAG_BC_S_GE:
591 case INET_DIAG_BC_S_LE:
592 case INET_DIAG_BC_D_GE:
593 case INET_DIAG_BC_D_LE:
594 if (!valid_port_comparison(bc, len, &min_len))
595 return -EINVAL;
596 break;
597 case INET_DIAG_BC_AUTO:
598 case INET_DIAG_BC_JMP:
599 case INET_DIAG_BC_NOP:
600 break;
601 default:
602 return -EINVAL;
603 }
604
605 if (op->code != INET_DIAG_BC_NOP) {
606 if (op->no < min_len || op->no > len + 4 || op->no & 3)
607 return -EINVAL;
608 if (op->no < len &&
609 !valid_cc(bytecode, bytecode_len, len - op->no))
610 return -EINVAL;
611 }
612
613 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
614 return -EINVAL;
615 bc += op->yes;
616 len -= op->yes;
617 }
618 return len == 0 ? 0 : -EINVAL;
619 }
620
621 static int inet_csk_diag_dump(struct sock *sk,
622 struct sk_buff *skb,
623 struct netlink_callback *cb,
624 struct inet_diag_req_v2 *r,
625 const struct nlattr *bc)
626 {
627 if (!inet_diag_bc_sk(bc, sk))
628 return 0;
629
630 return inet_csk_diag_fill(sk, skb, r,
631 sk_user_ns(NETLINK_CB(cb->skb).ssk),
632 NETLINK_CB(cb->skb).portid,
633 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
634 }
635
636 static int inet_twsk_diag_dump(struct inet_timewait_sock *tw,
637 struct sk_buff *skb,
638 struct netlink_callback *cb,
639 struct inet_diag_req_v2 *r,
640 const struct nlattr *bc)
641 {
642 if (bc != NULL) {
643 struct inet_diag_entry entry;
644
645 entry.family = tw->tw_family;
646 #if IS_ENABLED(CONFIG_IPV6)
647 if (tw->tw_family == AF_INET6) {
648 struct inet6_timewait_sock *tw6 =
649 inet6_twsk((struct sock *)tw);
650 entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32;
651 entry.daddr = tw6->tw_v6_daddr.s6_addr32;
652 } else
653 #endif
654 {
655 entry.saddr = &tw->tw_rcv_saddr;
656 entry.daddr = &tw->tw_daddr;
657 }
658 entry.sport = tw->tw_num;
659 entry.dport = ntohs(tw->tw_dport);
660 entry.userlocks = 0;
661
662 if (!inet_diag_bc_run(bc, &entry))
663 return 0;
664 }
665
666 return inet_twsk_diag_fill(tw, skb, r,
667 NETLINK_CB(cb->skb).portid,
668 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
669 }
670
671 /* Get the IPv4, IPv6, or IPv4-mapped-IPv6 local and remote addresses
672 * from a request_sock. For IPv4-mapped-IPv6 we must map IPv4 to IPv6.
673 */
674 static inline void inet_diag_req_addrs(const struct sock *sk,
675 const struct request_sock *req,
676 struct inet_diag_entry *entry)
677 {
678 struct inet_request_sock *ireq = inet_rsk(req);
679
680 #if IS_ENABLED(CONFIG_IPV6)
681 if (sk->sk_family == AF_INET6) {
682 if (req->rsk_ops->family == AF_INET6) {
683 entry->saddr = inet6_rsk(req)->loc_addr.s6_addr32;
684 entry->daddr = inet6_rsk(req)->rmt_addr.s6_addr32;
685 } else if (req->rsk_ops->family == AF_INET) {
686 ipv6_addr_set_v4mapped(ireq->loc_addr,
687 &entry->saddr_storage);
688 ipv6_addr_set_v4mapped(ireq->rmt_addr,
689 &entry->daddr_storage);
690 entry->saddr = entry->saddr_storage.s6_addr32;
691 entry->daddr = entry->daddr_storage.s6_addr32;
692 }
693 } else
694 #endif
695 {
696 entry->saddr = &ireq->loc_addr;
697 entry->daddr = &ireq->rmt_addr;
698 }
699 }
700
701 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
702 struct request_sock *req,
703 struct user_namespace *user_ns,
704 u32 portid, u32 seq,
705 const struct nlmsghdr *unlh)
706 {
707 const struct inet_request_sock *ireq = inet_rsk(req);
708 struct inet_sock *inet = inet_sk(sk);
709 struct inet_diag_msg *r;
710 struct nlmsghdr *nlh;
711 long tmo;
712
713 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
714 NLM_F_MULTI);
715 if (!nlh)
716 return -EMSGSIZE;
717
718 r = nlmsg_data(nlh);
719 r->idiag_family = sk->sk_family;
720 r->idiag_state = TCP_SYN_RECV;
721 r->idiag_timer = 1;
722 r->idiag_retrans = req->num_retrans;
723
724 r->id.idiag_if = sk->sk_bound_dev_if;
725 sock_diag_save_cookie(req, r->id.idiag_cookie);
726
727 tmo = req->expires - jiffies;
728 if (tmo < 0)
729 tmo = 0;
730
731 r->id.idiag_sport = inet->inet_sport;
732 r->id.idiag_dport = ireq->rmt_port;
733 r->id.idiag_src[0] = ireq->loc_addr;
734 r->id.idiag_dst[0] = ireq->rmt_addr;
735 r->idiag_expires = jiffies_to_msecs(tmo);
736 r->idiag_rqueue = 0;
737 r->idiag_wqueue = 0;
738 r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
739 r->idiag_inode = 0;
740 #if IS_ENABLED(CONFIG_IPV6)
741 if (r->idiag_family == AF_INET6) {
742 struct inet_diag_entry entry;
743 inet_diag_req_addrs(sk, req, &entry);
744 memcpy(r->id.idiag_src, entry.saddr, sizeof(struct in6_addr));
745 memcpy(r->id.idiag_dst, entry.daddr, sizeof(struct in6_addr));
746 }
747 #endif
748
749 return nlmsg_end(skb, nlh);
750 }
751
752 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
753 struct netlink_callback *cb,
754 struct inet_diag_req_v2 *r,
755 const struct nlattr *bc)
756 {
757 struct inet_diag_entry entry;
758 struct inet_connection_sock *icsk = inet_csk(sk);
759 struct listen_sock *lopt;
760 struct inet_sock *inet = inet_sk(sk);
761 int j, s_j;
762 int reqnum, s_reqnum;
763 int err = 0;
764
765 s_j = cb->args[3];
766 s_reqnum = cb->args[4];
767
768 if (s_j > 0)
769 s_j--;
770
771 entry.family = sk->sk_family;
772
773 read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
774
775 lopt = icsk->icsk_accept_queue.listen_opt;
776 if (!lopt || !lopt->qlen)
777 goto out;
778
779 if (bc != NULL) {
780 entry.sport = inet->inet_num;
781 entry.userlocks = sk->sk_userlocks;
782 }
783
784 for (j = s_j; j < lopt->nr_table_entries; j++) {
785 struct request_sock *req, *head = lopt->syn_table[j];
786
787 reqnum = 0;
788 for (req = head; req; reqnum++, req = req->dl_next) {
789 struct inet_request_sock *ireq = inet_rsk(req);
790
791 if (reqnum < s_reqnum)
792 continue;
793 if (r->id.idiag_dport != ireq->rmt_port &&
794 r->id.idiag_dport)
795 continue;
796
797 if (bc) {
798 inet_diag_req_addrs(sk, req, &entry);
799 entry.dport = ntohs(ireq->rmt_port);
800
801 if (!inet_diag_bc_run(bc, &entry))
802 continue;
803 }
804
805 err = inet_diag_fill_req(skb, sk, req,
806 sk_user_ns(NETLINK_CB(cb->skb).ssk),
807 NETLINK_CB(cb->skb).portid,
808 cb->nlh->nlmsg_seq, cb->nlh);
809 if (err < 0) {
810 cb->args[3] = j + 1;
811 cb->args[4] = reqnum;
812 goto out;
813 }
814 }
815
816 s_reqnum = 0;
817 }
818
819 out:
820 read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
821
822 return err;
823 }
824
825 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
826 struct netlink_callback *cb, struct inet_diag_req_v2 *r, struct nlattr *bc)
827 {
828 int i, num;
829 int s_i, s_num;
830 struct net *net = sock_net(skb->sk);
831
832 s_i = cb->args[1];
833 s_num = num = cb->args[2];
834
835 if (cb->args[0] == 0) {
836 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
837 goto skip_listen_ht;
838
839 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
840 struct sock *sk;
841 struct hlist_nulls_node *node;
842 struct inet_listen_hashbucket *ilb;
843
844 num = 0;
845 ilb = &hashinfo->listening_hash[i];
846 spin_lock_bh(&ilb->lock);
847 sk_nulls_for_each(sk, node, &ilb->head) {
848 struct inet_sock *inet = inet_sk(sk);
849
850 if (!net_eq(sock_net(sk), net))
851 continue;
852
853 if (num < s_num) {
854 num++;
855 continue;
856 }
857
858 if (r->sdiag_family != AF_UNSPEC &&
859 sk->sk_family != r->sdiag_family)
860 goto next_listen;
861
862 if (r->id.idiag_sport != inet->inet_sport &&
863 r->id.idiag_sport)
864 goto next_listen;
865
866 if (!(r->idiag_states & TCPF_LISTEN) ||
867 r->id.idiag_dport ||
868 cb->args[3] > 0)
869 goto syn_recv;
870
871 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
872 spin_unlock_bh(&ilb->lock);
873 goto done;
874 }
875
876 syn_recv:
877 if (!(r->idiag_states & TCPF_SYN_RECV))
878 goto next_listen;
879
880 if (inet_diag_dump_reqs(skb, sk, cb, r, bc) < 0) {
881 spin_unlock_bh(&ilb->lock);
882 goto done;
883 }
884
885 next_listen:
886 cb->args[3] = 0;
887 cb->args[4] = 0;
888 ++num;
889 }
890 spin_unlock_bh(&ilb->lock);
891
892 s_num = 0;
893 cb->args[3] = 0;
894 cb->args[4] = 0;
895 }
896 skip_listen_ht:
897 cb->args[0] = 1;
898 s_i = num = s_num = 0;
899 }
900
901 if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
902 goto out;
903
904 for (i = s_i; i <= hashinfo->ehash_mask; i++) {
905 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
906 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
907 struct sock *sk;
908 struct hlist_nulls_node *node;
909
910 num = 0;
911
912 if (hlist_nulls_empty(&head->chain) &&
913 hlist_nulls_empty(&head->twchain))
914 continue;
915
916 if (i > s_i)
917 s_num = 0;
918
919 spin_lock_bh(lock);
920 sk_nulls_for_each(sk, node, &head->chain) {
921 struct inet_sock *inet = inet_sk(sk);
922
923 if (!net_eq(sock_net(sk), net))
924 continue;
925 if (num < s_num)
926 goto next_normal;
927 if (!(r->idiag_states & (1 << sk->sk_state)))
928 goto next_normal;
929 if (r->sdiag_family != AF_UNSPEC &&
930 sk->sk_family != r->sdiag_family)
931 goto next_normal;
932 if (r->id.idiag_sport != inet->inet_sport &&
933 r->id.idiag_sport)
934 goto next_normal;
935 if (r->id.idiag_dport != inet->inet_dport &&
936 r->id.idiag_dport)
937 goto next_normal;
938 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
939 spin_unlock_bh(lock);
940 goto done;
941 }
942 next_normal:
943 ++num;
944 }
945
946 if (r->idiag_states & TCPF_TIME_WAIT) {
947 struct inet_timewait_sock *tw;
948
949 inet_twsk_for_each(tw, node,
950 &head->twchain) {
951 if (!net_eq(twsk_net(tw), net))
952 continue;
953
954 if (num < s_num)
955 goto next_dying;
956 if (r->sdiag_family != AF_UNSPEC &&
957 tw->tw_family != r->sdiag_family)
958 goto next_dying;
959 if (r->id.idiag_sport != tw->tw_sport &&
960 r->id.idiag_sport)
961 goto next_dying;
962 if (r->id.idiag_dport != tw->tw_dport &&
963 r->id.idiag_dport)
964 goto next_dying;
965 if (inet_twsk_diag_dump(tw, skb, cb, r, bc) < 0) {
966 spin_unlock_bh(lock);
967 goto done;
968 }
969 next_dying:
970 ++num;
971 }
972 }
973 spin_unlock_bh(lock);
974 }
975
976 done:
977 cb->args[1] = i;
978 cb->args[2] = num;
979 out:
980 ;
981 }
982 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
983
984 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
985 struct inet_diag_req_v2 *r, struct nlattr *bc)
986 {
987 const struct inet_diag_handler *handler;
988 int err = 0;
989
990 handler = inet_diag_lock_handler(r->sdiag_protocol);
991 if (!IS_ERR(handler))
992 handler->dump(skb, cb, r, bc);
993 else
994 err = PTR_ERR(handler);
995 inet_diag_unlock_handler(handler);
996
997 return err ? : skb->len;
998 }
999
1000 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
1001 {
1002 struct nlattr *bc = NULL;
1003 int hdrlen = sizeof(struct inet_diag_req_v2);
1004
1005 if (nlmsg_attrlen(cb->nlh, hdrlen))
1006 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1007
1008 return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
1009 }
1010
1011 static inline int inet_diag_type2proto(int type)
1012 {
1013 switch (type) {
1014 case TCPDIAG_GETSOCK:
1015 return IPPROTO_TCP;
1016 case DCCPDIAG_GETSOCK:
1017 return IPPROTO_DCCP;
1018 default:
1019 return 0;
1020 }
1021 }
1022
1023 static int inet_diag_dump_compat(struct sk_buff *skb, struct netlink_callback *cb)
1024 {
1025 struct inet_diag_req *rc = nlmsg_data(cb->nlh);
1026 struct inet_diag_req_v2 req;
1027 struct nlattr *bc = NULL;
1028 int hdrlen = sizeof(struct inet_diag_req);
1029
1030 req.sdiag_family = AF_UNSPEC; /* compatibility */
1031 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
1032 req.idiag_ext = rc->idiag_ext;
1033 req.idiag_states = rc->idiag_states;
1034 req.id = rc->id;
1035
1036 if (nlmsg_attrlen(cb->nlh, hdrlen))
1037 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1038
1039 return __inet_diag_dump(skb, cb, &req, bc);
1040 }
1041
1042 static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
1043 const struct nlmsghdr *nlh)
1044 {
1045 struct inet_diag_req *rc = nlmsg_data(nlh);
1046 struct inet_diag_req_v2 req;
1047
1048 req.sdiag_family = rc->idiag_family;
1049 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
1050 req.idiag_ext = rc->idiag_ext;
1051 req.idiag_states = rc->idiag_states;
1052 req.id = rc->id;
1053
1054 return inet_diag_get_exact(in_skb, nlh, &req);
1055 }
1056
1057 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
1058 {
1059 int hdrlen = sizeof(struct inet_diag_req);
1060 struct net *net = sock_net(skb->sk);
1061
1062 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
1063 nlmsg_len(nlh) < hdrlen)
1064 return -EINVAL;
1065
1066 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1067 if (nlmsg_attrlen(nlh, hdrlen)) {
1068 struct nlattr *attr;
1069
1070 attr = nlmsg_find_attr(nlh, hdrlen,
1071 INET_DIAG_REQ_BYTECODE);
1072 if (attr == NULL ||
1073 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
1074 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
1075 return -EINVAL;
1076 }
1077 {
1078 struct netlink_dump_control c = {
1079 .dump = inet_diag_dump_compat,
1080 };
1081 return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
1082 }
1083 }
1084
1085 return inet_diag_get_exact_compat(skb, nlh);
1086 }
1087
1088 static int inet_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
1089 {
1090 int hdrlen = sizeof(struct inet_diag_req_v2);
1091 struct net *net = sock_net(skb->sk);
1092
1093 if (nlmsg_len(h) < hdrlen)
1094 return -EINVAL;
1095
1096 if (h->nlmsg_flags & NLM_F_DUMP) {
1097 if (nlmsg_attrlen(h, hdrlen)) {
1098 struct nlattr *attr;
1099 attr = nlmsg_find_attr(h, hdrlen,
1100 INET_DIAG_REQ_BYTECODE);
1101 if (attr == NULL ||
1102 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
1103 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
1104 return -EINVAL;
1105 }
1106 {
1107 struct netlink_dump_control c = {
1108 .dump = inet_diag_dump,
1109 };
1110 return netlink_dump_start(net->diag_nlsk, skb, h, &c);
1111 }
1112 }
1113
1114 return inet_diag_get_exact(skb, h, nlmsg_data(h));
1115 }
1116
1117 static const struct sock_diag_handler inet_diag_handler = {
1118 .family = AF_INET,
1119 .dump = inet_diag_handler_dump,
1120 };
1121
1122 static const struct sock_diag_handler inet6_diag_handler = {
1123 .family = AF_INET6,
1124 .dump = inet_diag_handler_dump,
1125 };
1126
1127 int inet_diag_register(const struct inet_diag_handler *h)
1128 {
1129 const __u16 type = h->idiag_type;
1130 int err = -EINVAL;
1131
1132 if (type >= IPPROTO_MAX)
1133 goto out;
1134
1135 mutex_lock(&inet_diag_table_mutex);
1136 err = -EEXIST;
1137 if (inet_diag_table[type] == NULL) {
1138 inet_diag_table[type] = h;
1139 err = 0;
1140 }
1141 mutex_unlock(&inet_diag_table_mutex);
1142 out:
1143 return err;
1144 }
1145 EXPORT_SYMBOL_GPL(inet_diag_register);
1146
1147 void inet_diag_unregister(const struct inet_diag_handler *h)
1148 {
1149 const __u16 type = h->idiag_type;
1150
1151 if (type >= IPPROTO_MAX)
1152 return;
1153
1154 mutex_lock(&inet_diag_table_mutex);
1155 inet_diag_table[type] = NULL;
1156 mutex_unlock(&inet_diag_table_mutex);
1157 }
1158 EXPORT_SYMBOL_GPL(inet_diag_unregister);
1159
1160 static int __init inet_diag_init(void)
1161 {
1162 const int inet_diag_table_size = (IPPROTO_MAX *
1163 sizeof(struct inet_diag_handler *));
1164 int err = -ENOMEM;
1165
1166 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1167 if (!inet_diag_table)
1168 goto out;
1169
1170 err = sock_diag_register(&inet_diag_handler);
1171 if (err)
1172 goto out_free_nl;
1173
1174 err = sock_diag_register(&inet6_diag_handler);
1175 if (err)
1176 goto out_free_inet;
1177
1178 sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1179 out:
1180 return err;
1181
1182 out_free_inet:
1183 sock_diag_unregister(&inet_diag_handler);
1184 out_free_nl:
1185 kfree(inet_diag_table);
1186 goto out;
1187 }
1188
1189 static void __exit inet_diag_exit(void)
1190 {
1191 sock_diag_unregister(&inet6_diag_handler);
1192 sock_diag_unregister(&inet_diag_handler);
1193 sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1194 kfree(inet_diag_table);
1195 }
1196
1197 module_init(inet_diag_init);
1198 module_exit(inet_diag_exit);
1199 MODULE_LICENSE("GPL");
1200 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1201 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);
CRIS linux kernel tree