projects / deliverable / linux.git / blob
? search:


cd261f6e3abb1fd96bdbe8c55db8b5d771764d8e
[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 const __be32 *saddr;
42 const __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 void inet_diag_unlock_handler(const struct inet_diag_handler *handler)
69 {
70 mutex_unlock(&inet_diag_table_mutex);
71 }
72
73 int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
74 struct sk_buff *skb, struct inet_diag_req_v2 *req,
75 struct user_namespace *user_ns,
76 u32 portid, u32 seq, u16 nlmsg_flags,
77 const struct nlmsghdr *unlh)
78 {
79 const struct inet_sock *inet = inet_sk(sk);
80 const struct inet_diag_handler *handler;
81 int ext = req->idiag_ext;
82 struct inet_diag_msg *r;
83 struct nlmsghdr *nlh;
84 struct nlattr *attr;
85 void *info = NULL;
86
87 handler = inet_diag_table[req->sdiag_protocol];
88 BUG_ON(!handler);
89
90 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
91 nlmsg_flags);
92 if (!nlh)
93 return -EMSGSIZE;
94
95 r = nlmsg_data(nlh);
96 BUG_ON(sk->sk_state == TCP_TIME_WAIT);
97
98 r->idiag_family = sk->sk_family;
99 r->idiag_state = sk->sk_state;
100 r->idiag_timer = 0;
101 r->idiag_retrans = 0;
102
103 r->id.idiag_if = sk->sk_bound_dev_if;
104 sock_diag_save_cookie(sk, r->id.idiag_cookie);
105
106 r->id.idiag_sport = inet->inet_sport;
107 r->id.idiag_dport = inet->inet_dport;
108
109 memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
110 memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
111
112 r->id.idiag_src[0] = inet->inet_rcv_saddr;
113 r->id.idiag_dst[0] = inet->inet_daddr;
114
115 if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown))
116 goto errout;
117
118 /* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
119 * hence this needs to be included regardless of socket family.
120 */
121 if (ext & (1 << (INET_DIAG_TOS - 1)))
122 if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0)
123 goto errout;
124
125 #if IS_ENABLED(CONFIG_IPV6)
126 if (r->idiag_family == AF_INET6) {
127 *(struct in6_addr *)r->id.idiag_src = sk->sk_v6_rcv_saddr;
128 *(struct in6_addr *)r->id.idiag_dst = sk->sk_v6_daddr;
129
130 if (ext & (1 << (INET_DIAG_TCLASS - 1)))
131 if (nla_put_u8(skb, INET_DIAG_TCLASS,
132 inet6_sk(sk)->tclass) < 0)
133 goto errout;
134 }
135 #endif
136
137 r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
138 r->idiag_inode = sock_i_ino(sk);
139
140 if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
141 struct inet_diag_meminfo minfo = {
142 .idiag_rmem = sk_rmem_alloc_get(sk),
143 .idiag_wmem = sk->sk_wmem_queued,
144 .idiag_fmem = sk->sk_forward_alloc,
145 .idiag_tmem = sk_wmem_alloc_get(sk),
146 };
147
148 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
149 goto errout;
150 }
151
152 if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
153 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
154 goto errout;
155
156 if (!icsk) {
157 handler->idiag_get_info(sk, r, NULL);
158 goto out;
159 }
160
161 #define EXPIRES_IN_MS(tmo) DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
162
163 if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
164 icsk->icsk_pending == ICSK_TIME_EARLY_RETRANS ||
165 icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
166 r->idiag_timer = 1;
167 r->idiag_retrans = icsk->icsk_retransmits;
168 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
169 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
170 r->idiag_timer = 4;
171 r->idiag_retrans = icsk->icsk_probes_out;
172 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
173 } else if (timer_pending(&sk->sk_timer)) {
174 r->idiag_timer = 2;
175 r->idiag_retrans = icsk->icsk_probes_out;
176 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
177 } else {
178 r->idiag_timer = 0;
179 r->idiag_expires = 0;
180 }
181 #undef EXPIRES_IN_MS
182
183 if (ext & (1 << (INET_DIAG_INFO - 1))) {
184 attr = nla_reserve(skb, INET_DIAG_INFO,
185 sizeof(struct tcp_info));
186 if (!attr)
187 goto errout;
188
189 info = nla_data(attr);
190 }
191
192 if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops)
193 if (nla_put_string(skb, INET_DIAG_CONG,
194 icsk->icsk_ca_ops->name) < 0)
195 goto errout;
196
197 handler->idiag_get_info(sk, r, info);
198
199 if (sk->sk_state < TCP_TIME_WAIT &&
200 icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
201 icsk->icsk_ca_ops->get_info(sk, ext, skb);
202
203 out:
204 nlmsg_end(skb, nlh);
205 return 0;
206
207 errout:
208 nlmsg_cancel(skb, nlh);
209 return -EMSGSIZE;
210 }
211 EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
212
213 static int inet_csk_diag_fill(struct sock *sk,
214 struct sk_buff *skb,
215 struct inet_diag_req_v2 *req,
216 struct user_namespace *user_ns,
217 u32 portid, u32 seq, u16 nlmsg_flags,
218 const struct nlmsghdr *unlh)
219 {
220 return inet_sk_diag_fill(sk, inet_csk(sk), skb, req,
221 user_ns, portid, seq, nlmsg_flags, unlh);
222 }
223
224 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw,
225 struct sk_buff *skb,
226 struct inet_diag_req_v2 *req,
227 u32 portid, u32 seq, u16 nlmsg_flags,
228 const struct nlmsghdr *unlh)
229 {
230 struct inet_diag_msg *r;
231 struct nlmsghdr *nlh;
232 s32 tmo;
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,
294 struct sk_buff *in_skb,
295 const struct nlmsghdr *nlh,
296 struct inet_diag_req_v2 *req)
297 {
298 struct net *net = sock_net(in_skb->sk);
299 struct sk_buff *rep;
300 struct sock *sk;
301 int err;
302
303 err = -EINVAL;
304 if (req->sdiag_family == AF_INET)
305 sk = inet_lookup(net, hashinfo, req->id.idiag_dst[0],
306 req->id.idiag_dport, req->id.idiag_src[0],
307 req->id.idiag_sport, req->id.idiag_if);
308 #if IS_ENABLED(CONFIG_IPV6)
309 else if (req->sdiag_family == AF_INET6)
310 sk = inet6_lookup(net, hashinfo,
311 (struct in6_addr *)req->id.idiag_dst,
312 req->id.idiag_dport,
313 (struct in6_addr *)req->id.idiag_src,
314 req->id.idiag_sport,
315 req->id.idiag_if);
316 #endif
317 else
318 goto out_nosk;
319
320 err = -ENOENT;
321 if (!sk)
322 goto out_nosk;
323
324 err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
325 if (err)
326 goto out;
327
328 rep = nlmsg_new(sizeof(struct inet_diag_msg) +
329 sizeof(struct inet_diag_meminfo) +
330 sizeof(struct tcp_info) + 64, GFP_KERNEL);
331 if (!rep) {
332 err = -ENOMEM;
333 goto out;
334 }
335
336 err = sk_diag_fill(sk, rep, req,
337 sk_user_ns(NETLINK_CB(in_skb).sk),
338 NETLINK_CB(in_skb).portid,
339 nlh->nlmsg_seq, 0, nlh);
340 if (err < 0) {
341 WARN_ON(err == -EMSGSIZE);
342 nlmsg_free(rep);
343 goto out;
344 }
345 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
346 MSG_DONTWAIT);
347 if (err > 0)
348 err = 0;
349
350 out:
351 if (sk)
352 sock_gen_put(sk);
353
354 out_nosk:
355 return err;
356 }
357 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
358
359 static int inet_diag_get_exact(struct sk_buff *in_skb,
360 const struct nlmsghdr *nlh,
361 struct inet_diag_req_v2 *req)
362 {
363 const struct inet_diag_handler *handler;
364 int err;
365
366 handler = inet_diag_lock_handler(req->sdiag_protocol);
367 if (IS_ERR(handler))
368 err = PTR_ERR(handler);
369 else
370 err = handler->dump_one(in_skb, nlh, req);
371 inet_diag_unlock_handler(handler);
372
373 return err;
374 }
375
376 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
377 {
378 int words = bits >> 5;
379
380 bits &= 0x1f;
381
382 if (words) {
383 if (memcmp(a1, a2, words << 2))
384 return 0;
385 }
386 if (bits) {
387 __be32 w1, w2;
388 __be32 mask;
389
390 w1 = a1[words];
391 w2 = a2[words];
392
393 mask = htonl((0xffffffff) << (32 - bits));
394
395 if ((w1 ^ w2) & mask)
396 return 0;
397 }
398
399 return 1;
400 }
401
402 static int inet_diag_bc_run(const struct nlattr *_bc,
403 const struct inet_diag_entry *entry)
404 {
405 const void *bc = nla_data(_bc);
406 int len = nla_len(_bc);
407
408 while (len > 0) {
409 int yes = 1;
410 const struct inet_diag_bc_op *op = bc;
411
412 switch (op->code) {
413 case INET_DIAG_BC_NOP:
414 break;
415 case INET_DIAG_BC_JMP:
416 yes = 0;
417 break;
418 case INET_DIAG_BC_S_GE:
419 yes = entry->sport >= op[1].no;
420 break;
421 case INET_DIAG_BC_S_LE:
422 yes = entry->sport <= op[1].no;
423 break;
424 case INET_DIAG_BC_D_GE:
425 yes = entry->dport >= op[1].no;
426 break;
427 case INET_DIAG_BC_D_LE:
428 yes = entry->dport <= op[1].no;
429 break;
430 case INET_DIAG_BC_AUTO:
431 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
432 break;
433 case INET_DIAG_BC_S_COND:
434 case INET_DIAG_BC_D_COND: {
435 const struct inet_diag_hostcond *cond;
436 const __be32 *addr;
437
438 cond = (const struct inet_diag_hostcond *)(op + 1);
439 if (cond->port != -1 &&
440 cond->port != (op->code == INET_DIAG_BC_S_COND ?
441 entry->sport : entry->dport)) {
442 yes = 0;
443 break;
444 }
445
446 if (op->code == INET_DIAG_BC_S_COND)
447 addr = entry->saddr;
448 else
449 addr = entry->daddr;
450
451 if (cond->family != AF_UNSPEC &&
452 cond->family != entry->family) {
453 if (entry->family == AF_INET6 &&
454 cond->family == AF_INET) {
455 if (addr[0] == 0 && addr[1] == 0 &&
456 addr[2] == htonl(0xffff) &&
457 bitstring_match(addr + 3,
458 cond->addr,
459 cond->prefix_len))
460 break;
461 }
462 yes = 0;
463 break;
464 }
465
466 if (cond->prefix_len == 0)
467 break;
468 if (bitstring_match(addr, cond->addr,
469 cond->prefix_len))
470 break;
471 yes = 0;
472 break;
473 }
474 }
475
476 if (yes) {
477 len -= op->yes;
478 bc += op->yes;
479 } else {
480 len -= op->no;
481 bc += op->no;
482 }
483 }
484 return len == 0;
485 }
486
487 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
488 {
489 struct inet_sock *inet = inet_sk(sk);
490 struct inet_diag_entry entry;
491
492 if (!bc)
493 return 1;
494
495 entry.family = sk->sk_family;
496 #if IS_ENABLED(CONFIG_IPV6)
497 if (entry.family == AF_INET6) {
498 entry.saddr = sk->sk_v6_rcv_saddr.s6_addr32;
499 entry.daddr = sk->sk_v6_daddr.s6_addr32;
500 } else
501 #endif
502 {
503 entry.saddr = &inet->inet_rcv_saddr;
504 entry.daddr = &inet->inet_daddr;
505 }
506 entry.sport = inet->inet_num;
507 entry.dport = ntohs(inet->inet_dport);
508 entry.userlocks = (sk->sk_state != TCP_TIME_WAIT) ? sk->sk_userlocks : 0;
509
510 return inet_diag_bc_run(bc, &entry);
511 }
512 EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
513
514 static int valid_cc(const void *bc, int len, int cc)
515 {
516 while (len >= 0) {
517 const struct inet_diag_bc_op *op = bc;
518
519 if (cc > len)
520 return 0;
521 if (cc == len)
522 return 1;
523 if (op->yes < 4 || op->yes & 3)
524 return 0;
525 len -= op->yes;
526 bc += op->yes;
527 }
528 return 0;
529 }
530
531 /* Validate an inet_diag_hostcond. */
532 static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
533 int *min_len)
534 {
535 struct inet_diag_hostcond *cond;
536 int addr_len;
537
538 /* Check hostcond space. */
539 *min_len += sizeof(struct inet_diag_hostcond);
540 if (len < *min_len)
541 return false;
542 cond = (struct inet_diag_hostcond *)(op + 1);
543
544 /* Check address family and address length. */
545 switch (cond->family) {
546 case AF_UNSPEC:
547 addr_len = 0;
548 break;
549 case AF_INET:
550 addr_len = sizeof(struct in_addr);
551 break;
552 case AF_INET6:
553 addr_len = sizeof(struct in6_addr);
554 break;
555 default:
556 return false;
557 }
558 *min_len += addr_len;
559 if (len < *min_len)
560 return false;
561
562 /* Check prefix length (in bits) vs address length (in bytes). */
563 if (cond->prefix_len > 8 * addr_len)
564 return false;
565
566 return true;
567 }
568
569 /* Validate a port comparison operator. */
570 static bool valid_port_comparison(const struct inet_diag_bc_op *op,
571 int len, int *min_len)
572 {
573 /* Port comparisons put the port in a follow-on inet_diag_bc_op. */
574 *min_len += sizeof(struct inet_diag_bc_op);
575 if (len < *min_len)
576 return false;
577 return true;
578 }
579
580 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
581 {
582 const void *bc = bytecode;
583 int len = bytecode_len;
584
585 while (len > 0) {
586 int min_len = sizeof(struct inet_diag_bc_op);
587 const struct inet_diag_bc_op *op = bc;
588
589 switch (op->code) {
590 case INET_DIAG_BC_S_COND:
591 case INET_DIAG_BC_D_COND:
592 if (!valid_hostcond(bc, len, &min_len))
593 return -EINVAL;
594 break;
595 case INET_DIAG_BC_S_GE:
596 case INET_DIAG_BC_S_LE:
597 case INET_DIAG_BC_D_GE:
598 case INET_DIAG_BC_D_LE:
599 if (!valid_port_comparison(bc, len, &min_len))
600 return -EINVAL;
601 break;
602 case INET_DIAG_BC_AUTO:
603 case INET_DIAG_BC_JMP:
604 case INET_DIAG_BC_NOP:
605 break;
606 default:
607 return -EINVAL;
608 }
609
610 if (op->code != INET_DIAG_BC_NOP) {
611 if (op->no < min_len || op->no > len + 4 || op->no & 3)
612 return -EINVAL;
613 if (op->no < len &&
614 !valid_cc(bytecode, bytecode_len, len - op->no))
615 return -EINVAL;
616 }
617
618 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
619 return -EINVAL;
620 bc += op->yes;
621 len -= op->yes;
622 }
623 return len == 0 ? 0 : -EINVAL;
624 }
625
626 static int inet_csk_diag_dump(struct sock *sk,
627 struct sk_buff *skb,
628 struct netlink_callback *cb,
629 struct inet_diag_req_v2 *r,
630 const struct nlattr *bc)
631 {
632 if (!inet_diag_bc_sk(bc, sk))
633 return 0;
634
635 return inet_csk_diag_fill(sk, skb, r,
636 sk_user_ns(NETLINK_CB(cb->skb).sk),
637 NETLINK_CB(cb->skb).portid,
638 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
639 }
640
641 static void twsk_build_assert(void)
642 {
643 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) !=
644 offsetof(struct sock, sk_family));
645
646 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) !=
647 offsetof(struct inet_sock, inet_num));
648
649 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) !=
650 offsetof(struct inet_sock, inet_dport));
651
652 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) !=
653 offsetof(struct inet_sock, inet_rcv_saddr));
654
655 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) !=
656 offsetof(struct inet_sock, inet_daddr));
657
658 #if IS_ENABLED(CONFIG_IPV6)
659 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) !=
660 offsetof(struct sock, sk_v6_rcv_saddr));
661
662 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) !=
663 offsetof(struct sock, sk_v6_daddr));
664 #endif
665 }
666
667 static int inet_twsk_diag_dump(struct sock *sk,
668 struct sk_buff *skb,
669 struct netlink_callback *cb,
670 struct inet_diag_req_v2 *r,
671 const struct nlattr *bc)
672 {
673 twsk_build_assert();
674
675 if (!inet_diag_bc_sk(bc, sk))
676 return 0;
677
678 return inet_twsk_diag_fill(inet_twsk(sk), skb, r,
679 NETLINK_CB(cb->skb).portid,
680 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
681 }
682
683 /* Get the IPv4, IPv6, or IPv4-mapped-IPv6 local and remote addresses
684 * from a request_sock. For IPv4-mapped-IPv6 we must map IPv4 to IPv6.
685 */
686 static void inet_diag_req_addrs(const struct sock *sk,
687 const struct request_sock *req,
688 struct inet_diag_entry *entry)
689 {
690 const struct inet_request_sock *ireq = inet_rsk(req);
691
692 #if IS_ENABLED(CONFIG_IPV6)
693 if (sk->sk_family == AF_INET6) {
694 if (req->rsk_ops->family == AF_INET6) {
695 entry->saddr = ireq->ir_v6_loc_addr.s6_addr32;
696 entry->daddr = ireq->ir_v6_rmt_addr.s6_addr32;
697 } else if (req->rsk_ops->family == AF_INET) {
698 ipv6_addr_set_v4mapped(ireq->ir_loc_addr,
699 &entry->saddr_storage);
700 ipv6_addr_set_v4mapped(ireq->ir_rmt_addr,
701 &entry->daddr_storage);
702 entry->saddr = entry->saddr_storage.s6_addr32;
703 entry->daddr = entry->daddr_storage.s6_addr32;
704 }
705 } else
706 #endif
707 {
708 entry->saddr = &ireq->ir_loc_addr;
709 entry->daddr = &ireq->ir_rmt_addr;
710 }
711 }
712
713 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
714 struct request_sock *req,
715 struct user_namespace *user_ns,
716 u32 portid, u32 seq,
717 const struct nlmsghdr *unlh)
718 {
719 const struct inet_request_sock *ireq = inet_rsk(req);
720 struct inet_sock *inet = inet_sk(sk);
721 struct inet_diag_msg *r;
722 struct nlmsghdr *nlh;
723 long tmo;
724
725 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
726 NLM_F_MULTI);
727 if (!nlh)
728 return -EMSGSIZE;
729
730 r = nlmsg_data(nlh);
731 r->idiag_family = sk->sk_family;
732 r->idiag_state = TCP_SYN_RECV;
733 r->idiag_timer = 1;
734 r->idiag_retrans = req->num_retrans;
735
736 r->id.idiag_if = sk->sk_bound_dev_if;
737 sock_diag_save_cookie(req, r->id.idiag_cookie);
738
739 tmo = req->expires - jiffies;
740 if (tmo < 0)
741 tmo = 0;
742
743 r->id.idiag_sport = inet->inet_sport;
744 r->id.idiag_dport = ireq->ir_rmt_port;
745
746 memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
747 memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
748
749 r->id.idiag_src[0] = ireq->ir_loc_addr;
750 r->id.idiag_dst[0] = ireq->ir_rmt_addr;
751
752 r->idiag_expires = jiffies_to_msecs(tmo);
753 r->idiag_rqueue = 0;
754 r->idiag_wqueue = 0;
755 r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
756 r->idiag_inode = 0;
757 #if IS_ENABLED(CONFIG_IPV6)
758 if (r->idiag_family == AF_INET6) {
759 struct inet_diag_entry entry;
760
761 inet_diag_req_addrs(sk, req, &entry);
762 memcpy(r->id.idiag_src, entry.saddr, sizeof(struct in6_addr));
763 memcpy(r->id.idiag_dst, entry.daddr, sizeof(struct in6_addr));
764 }
765 #endif
766
767 nlmsg_end(skb, nlh);
768 return 0;
769 }
770
771 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
772 struct netlink_callback *cb,
773 struct inet_diag_req_v2 *r,
774 const struct nlattr *bc)
775 {
776 struct inet_connection_sock *icsk = inet_csk(sk);
777 struct inet_sock *inet = inet_sk(sk);
778 struct inet_diag_entry entry;
779 int j, s_j, reqnum, s_reqnum;
780 struct listen_sock *lopt;
781 int err = 0;
782
783 s_j = cb->args[3];
784 s_reqnum = cb->args[4];
785
786 if (s_j > 0)
787 s_j--;
788
789 entry.family = sk->sk_family;
790
791 read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
792
793 lopt = icsk->icsk_accept_queue.listen_opt;
794 if (!lopt || !lopt->qlen)
795 goto out;
796
797 if (bc) {
798 entry.sport = inet->inet_num;
799 entry.userlocks = sk->sk_userlocks;
800 }
801
802 for (j = s_j; j < lopt->nr_table_entries; j++) {
803 struct request_sock *req, *head = lopt->syn_table[j];
804
805 reqnum = 0;
806 for (req = head; req; reqnum++, req = req->dl_next) {
807 struct inet_request_sock *ireq = inet_rsk(req);
808
809 if (reqnum < s_reqnum)
810 continue;
811 if (r->id.idiag_dport != ireq->ir_rmt_port &&
812 r->id.idiag_dport)
813 continue;
814
815 if (bc) {
816 inet_diag_req_addrs(sk, req, &entry);
817 entry.dport = ntohs(ireq->ir_rmt_port);
818
819 if (!inet_diag_bc_run(bc, &entry))
820 continue;
821 }
822
823 err = inet_diag_fill_req(skb, sk, req,
824 sk_user_ns(NETLINK_CB(cb->skb).sk),
825 NETLINK_CB(cb->skb).portid,
826 cb->nlh->nlmsg_seq, cb->nlh);
827 if (err < 0) {
828 cb->args[3] = j + 1;
829 cb->args[4] = reqnum;
830 goto out;
831 }
832 }
833
834 s_reqnum = 0;
835 }
836
837 out:
838 read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
839
840 return err;
841 }
842
843 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
844 struct netlink_callback *cb,
845 struct inet_diag_req_v2 *r, struct nlattr *bc)
846 {
847 struct net *net = sock_net(skb->sk);
848 int i, num, s_i, s_num;
849
850 s_i = cb->args[1];
851 s_num = num = cb->args[2];
852
853 if (cb->args[0] == 0) {
854 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
855 goto skip_listen_ht;
856
857 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
858 struct inet_listen_hashbucket *ilb;
859 struct hlist_nulls_node *node;
860 struct sock *sk;
861
862 num = 0;
863 ilb = &hashinfo->listening_hash[i];
864 spin_lock_bh(&ilb->lock);
865 sk_nulls_for_each(sk, node, &ilb->head) {
866 struct inet_sock *inet = inet_sk(sk);
867
868 if (!net_eq(sock_net(sk), net))
869 continue;
870
871 if (num < s_num) {
872 num++;
873 continue;
874 }
875
876 if (r->sdiag_family != AF_UNSPEC &&
877 sk->sk_family != r->sdiag_family)
878 goto next_listen;
879
880 if (r->id.idiag_sport != inet->inet_sport &&
881 r->id.idiag_sport)
882 goto next_listen;
883
884 if (!(r->idiag_states & TCPF_LISTEN) ||
885 r->id.idiag_dport ||
886 cb->args[3] > 0)
887 goto syn_recv;
888
889 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
890 spin_unlock_bh(&ilb->lock);
891 goto done;
892 }
893
894 syn_recv:
895 if (!(r->idiag_states & TCPF_SYN_RECV))
896 goto next_listen;
897
898 if (inet_diag_dump_reqs(skb, sk, cb, r, bc) < 0) {
899 spin_unlock_bh(&ilb->lock);
900 goto done;
901 }
902
903 next_listen:
904 cb->args[3] = 0;
905 cb->args[4] = 0;
906 ++num;
907 }
908 spin_unlock_bh(&ilb->lock);
909
910 s_num = 0;
911 cb->args[3] = 0;
912 cb->args[4] = 0;
913 }
914 skip_listen_ht:
915 cb->args[0] = 1;
916 s_i = num = s_num = 0;
917 }
918
919 if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
920 goto out;
921
922 for (i = s_i; i <= hashinfo->ehash_mask; i++) {
923 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
924 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
925 struct hlist_nulls_node *node;
926 struct sock *sk;
927
928 num = 0;
929
930 if (hlist_nulls_empty(&head->chain))
931 continue;
932
933 if (i > s_i)
934 s_num = 0;
935
936 spin_lock_bh(lock);
937 sk_nulls_for_each(sk, node, &head->chain) {
938 int state, res;
939
940 if (!net_eq(sock_net(sk), net))
941 continue;
942 if (num < s_num)
943 goto next_normal;
944 state = (sk->sk_state == TCP_TIME_WAIT) ?
945 inet_twsk(sk)->tw_substate : sk->sk_state;
946 if (!(r->idiag_states & (1 << state)))
947 goto next_normal;
948 if (r->sdiag_family != AF_UNSPEC &&
949 sk->sk_family != r->sdiag_family)
950 goto next_normal;
951 if (r->id.idiag_sport != htons(sk->sk_num) &&
952 r->id.idiag_sport)
953 goto next_normal;
954 if (r->id.idiag_dport != sk->sk_dport &&
955 r->id.idiag_dport)
956 goto next_normal;
957 if (sk->sk_state == TCP_TIME_WAIT)
958 res = inet_twsk_diag_dump(sk, skb, cb, r, bc);
959 else
960 res = inet_csk_diag_dump(sk, skb, cb, r, bc);
961 if (res < 0) {
962 spin_unlock_bh(lock);
963 goto done;
964 }
965 next_normal:
966 ++num;
967 }
968
969 spin_unlock_bh(lock);
970 }
971
972 done:
973 cb->args[1] = i;
974 cb->args[2] = num;
975 out:
976 ;
977 }
978 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
979
980 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
981 struct inet_diag_req_v2 *r,
982 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 int hdrlen = sizeof(struct inet_diag_req_v2);
1000 struct nlattr *bc = NULL;
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 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,
1021 struct netlink_callback *cb)
1022 {
1023 struct inet_diag_req *rc = nlmsg_data(cb->nlh);
1024 int hdrlen = sizeof(struct inet_diag_req);
1025 struct inet_diag_req_v2 req;
1026 struct nlattr *bc = NULL;
1027
1028 req.sdiag_family = AF_UNSPEC; /* compatibility */
1029 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
1030 req.idiag_ext = rc->idiag_ext;
1031 req.idiag_states = rc->idiag_states;
1032 req.id = rc->id;
1033
1034 if (nlmsg_attrlen(cb->nlh, hdrlen))
1035 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1036
1037 return __inet_diag_dump(skb, cb, &req, bc);
1038 }
1039
1040 static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
1041 const struct nlmsghdr *nlh)
1042 {
1043 struct inet_diag_req *rc = nlmsg_data(nlh);
1044 struct inet_diag_req_v2 req;
1045
1046 req.sdiag_family = rc->idiag_family;
1047 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
1048 req.idiag_ext = rc->idiag_ext;
1049 req.idiag_states = rc->idiag_states;
1050 req.id = rc->id;
1051
1052 return inet_diag_get_exact(in_skb, nlh, &req);
1053 }
1054
1055 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
1056 {
1057 int hdrlen = sizeof(struct inet_diag_req);
1058 struct net *net = sock_net(skb->sk);
1059
1060 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
1061 nlmsg_len(nlh) < hdrlen)
1062 return -EINVAL;
1063
1064 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1065 if (nlmsg_attrlen(nlh, hdrlen)) {
1066 struct nlattr *attr;
1067
1068 attr = nlmsg_find_attr(nlh, hdrlen,
1069 INET_DIAG_REQ_BYTECODE);
1070 if (!attr ||
1071 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
1072 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
1073 return -EINVAL;
1074 }
1075 {
1076 struct netlink_dump_control c = {
1077 .dump = inet_diag_dump_compat,
1078 };
1079 return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
1080 }
1081 }
1082
1083 return inet_diag_get_exact_compat(skb, nlh);
1084 }
1085
1086 static int inet_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
1087 {
1088 int hdrlen = sizeof(struct inet_diag_req_v2);
1089 struct net *net = sock_net(skb->sk);
1090
1091 if (nlmsg_len(h) < hdrlen)
1092 return -EINVAL;
1093
1094 if (h->nlmsg_flags & NLM_F_DUMP) {
1095 if (nlmsg_attrlen(h, hdrlen)) {
1096 struct nlattr *attr;
1097
1098 attr = nlmsg_find_attr(h, hdrlen,
1099 INET_DIAG_REQ_BYTECODE);
1100 if (!attr ||
1101 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
1102 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
1103 return -EINVAL;
1104 }
1105 {
1106 struct netlink_dump_control c = {
1107 .dump = inet_diag_dump,
1108 };
1109 return netlink_dump_start(net->diag_nlsk, skb, h, &c);
1110 }
1111 }
1112
1113 return inet_diag_get_exact(skb, h, nlmsg_data(h));
1114 }
1115
1116 static const struct sock_diag_handler inet_diag_handler = {
1117 .family = AF_INET,
1118 .dump = inet_diag_handler_dump,
1119 };
1120
1121 static const struct sock_diag_handler inet6_diag_handler = {
1122 .family = AF_INET6,
1123 .dump = inet_diag_handler_dump,
1124 };
1125
1126 int inet_diag_register(const struct inet_diag_handler *h)
1127 {
1128 const __u16 type = h->idiag_type;
1129 int err = -EINVAL;
1130
1131 if (type >= IPPROTO_MAX)
1132 goto out;
1133
1134 mutex_lock(&inet_diag_table_mutex);
1135 err = -EEXIST;
1136 if (!inet_diag_table[type]) {
1137 inet_diag_table[type] = h;
1138 err = 0;
1139 }
1140 mutex_unlock(&inet_diag_table_mutex);
1141 out:
1142 return err;
1143 }
1144 EXPORT_SYMBOL_GPL(inet_diag_register);
1145
1146 void inet_diag_unregister(const struct inet_diag_handler *h)
1147 {
1148 const __u16 type = h->idiag_type;
1149
1150 if (type >= IPPROTO_MAX)
1151 return;
1152
1153 mutex_lock(&inet_diag_table_mutex);
1154 inet_diag_table[type] = NULL;
1155 mutex_unlock(&inet_diag_table_mutex);
1156 }
1157 EXPORT_SYMBOL_GPL(inet_diag_unregister);
1158
1159 static int __init inet_diag_init(void)
1160 {
1161 const int inet_diag_table_size = (IPPROTO_MAX *
1162 sizeof(struct inet_diag_handler *));
1163 int err = -ENOMEM;
1164
1165 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1166 if (!inet_diag_table)
1167 goto out;
1168
1169 err = sock_diag_register(&inet_diag_handler);
1170 if (err)
1171 goto out_free_nl;
1172
1173 err = sock_diag_register(&inet6_diag_handler);
1174 if (err)
1175 goto out_free_inet;
1176
1177 sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1178 out:
1179 return err;
1180
1181 out_free_inet:
1182 sock_diag_unregister(&inet_diag_handler);
1183 out_free_nl:
1184 kfree(inet_diag_table);
1185 goto out;
1186 }
1187
1188 static void __exit inet_diag_exit(void)
1189 {
1190 sock_diag_unregister(&inet6_diag_handler);
1191 sock_diag_unregister(&inet_diag_handler);
1192 sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1193 kfree(inet_diag_table);
1194 }
1195
1196 module_init(inet_diag_init);
1197 module_exit(inet_diag_exit);
1198 MODULE_LICENSE("GPL");
1199 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1200 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);
Linux kernel - Deliverables
This page took 0.074572 seconds and 4 git commands to generate.