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


e34dccbc4d70bd26f7cec88c031dcea31124314a
[deliverable/linux.git] / net / ipv4 / inet_diag.c
1 /*
2 * inet_diag.c Module for monitoring INET transport protocols sockets.
3 *
4 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/types.h>
15 #include <linux/fcntl.h>
16 #include <linux/random.h>
17 #include <linux/slab.h>
18 #include <linux/cache.h>
19 #include <linux/init.h>
20 #include <linux/time.h>
21
22 #include <net/icmp.h>
23 #include <net/tcp.h>
24 #include <net/ipv6.h>
25 #include <net/inet_common.h>
26 #include <net/inet_connection_sock.h>
27 #include <net/inet_hashtables.h>
28 #include <net/inet_timewait_sock.h>
29 #include <net/inet6_hashtables.h>
30 #include <net/netlink.h>
31
32 #include <linux/inet.h>
33 #include <linux/stddef.h>
34
35 #include <linux/inet_diag.h>
36 #include <linux/sock_diag.h>
37
38 static const struct inet_diag_handler **inet_diag_table;
39
40 struct inet_diag_entry {
41 __be32 *saddr;
42 __be32 *daddr;
43 u16 sport;
44 u16 dport;
45 u16 family;
46 u16 userlocks;
47 #if IS_ENABLED(CONFIG_IPV6)
48 struct in6_addr saddr_storage; /* for IPv4-mapped-IPv6 addresses */
49 struct in6_addr daddr_storage; /* for IPv4-mapped-IPv6 addresses */
50 #endif
51 };
52
53 static DEFINE_MUTEX(inet_diag_table_mutex);
54
55 static const struct inet_diag_handler *inet_diag_lock_handler(int proto)
56 {
57 if (!inet_diag_table[proto])
58 request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK,
59 NETLINK_SOCK_DIAG, AF_INET, proto);
60
61 mutex_lock(&inet_diag_table_mutex);
62 if (!inet_diag_table[proto])
63 return ERR_PTR(-ENOENT);
64
65 return inet_diag_table[proto];
66 }
67
68 static inline void inet_diag_unlock_handler(
69 const struct inet_diag_handler *handler)
70 {
71 mutex_unlock(&inet_diag_table_mutex);
72 }
73
74 int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
75 struct sk_buff *skb, struct inet_diag_req_v2 *req,
76 struct user_namespace *user_ns,
77 u32 portid, u32 seq, u16 nlmsg_flags,
78 const struct nlmsghdr *unlh)
79 {
80 const struct inet_sock *inet = inet_sk(sk);
81 struct inet_diag_msg *r;
82 struct nlmsghdr *nlh;
83 struct nlattr *attr;
84 void *info = NULL;
85 const struct inet_diag_handler *handler;
86 int ext = req->idiag_ext;
87
88 handler = inet_diag_table[req->sdiag_protocol];
89 BUG_ON(handler == NULL);
90
91 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
92 nlmsg_flags);
93 if (!nlh)
94 return -EMSGSIZE;
95
96 r = nlmsg_data(nlh);
97 BUG_ON(sk->sk_state == TCP_TIME_WAIT);
98
99 r->idiag_family = sk->sk_family;
100 r->idiag_state = sk->sk_state;
101 r->idiag_timer = 0;
102 r->idiag_retrans = 0;
103
104 r->id.idiag_if = sk->sk_bound_dev_if;
105 sock_diag_save_cookie(sk, r->id.idiag_cookie);
106
107 r->id.idiag_sport = inet->inet_sport;
108 r->id.idiag_dport = inet->inet_dport;
109
110 memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
111 memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
112
113 r->id.idiag_src[0] = inet->inet_rcv_saddr;
114 r->id.idiag_dst[0] = inet->inet_daddr;
115
116 if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown))
117 goto errout;
118
119 /* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
120 * hence this needs to be included regardless of socket family.
121 */
122 if (ext & (1 << (INET_DIAG_TOS - 1)))
123 if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0)
124 goto errout;
125
126 #if IS_ENABLED(CONFIG_IPV6)
127 if (r->idiag_family == AF_INET6) {
128
129 *(struct in6_addr *)r->id.idiag_src = sk->sk_v6_rcv_saddr;
130 *(struct in6_addr *)r->id.idiag_dst = sk->sk_v6_daddr;
131
132 if (ext & (1 << (INET_DIAG_TCLASS - 1)))
133 if (nla_put_u8(skb, INET_DIAG_TCLASS,
134 inet6_sk(sk)->tclass) < 0)
135 goto errout;
136 }
137 #endif
138
139 r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
140 r->idiag_inode = sock_i_ino(sk);
141
142 if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
143 struct inet_diag_meminfo minfo = {
144 .idiag_rmem = sk_rmem_alloc_get(sk),
145 .idiag_wmem = sk->sk_wmem_queued,
146 .idiag_fmem = sk->sk_forward_alloc,
147 .idiag_tmem = sk_wmem_alloc_get(sk),
148 };
149
150 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
151 goto errout;
152 }
153
154 if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
155 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
156 goto errout;
157
158 if (icsk == NULL) {
159 handler->idiag_get_info(sk, r, NULL);
160 goto out;
161 }
162
163 #define EXPIRES_IN_MS(tmo) DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
164
165 if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
166 icsk->icsk_pending == ICSK_TIME_EARLY_RETRANS ||
167 icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
168 r->idiag_timer = 1;
169 r->idiag_retrans = icsk->icsk_retransmits;
170 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
171 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
172 r->idiag_timer = 4;
173 r->idiag_retrans = icsk->icsk_probes_out;
174 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
175 } else if (timer_pending(&sk->sk_timer)) {
176 r->idiag_timer = 2;
177 r->idiag_retrans = icsk->icsk_probes_out;
178 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
179 } else {
180 r->idiag_timer = 0;
181 r->idiag_expires = 0;
182 }
183 #undef EXPIRES_IN_MS
184
185 if (ext & (1 << (INET_DIAG_INFO - 1))) {
186 attr = nla_reserve(skb, INET_DIAG_INFO,
187 sizeof(struct tcp_info));
188 if (!attr)
189 goto errout;
190
191 info = nla_data(attr);
192 }
193
194 if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops)
195 if (nla_put_string(skb, INET_DIAG_CONG,
196 icsk->icsk_ca_ops->name) < 0)
197 goto errout;
198
199 handler->idiag_get_info(sk, r, info);
200
201 if (sk->sk_state < TCP_TIME_WAIT &&
202 icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
203 icsk->icsk_ca_ops->get_info(sk, ext, skb);
204
205 out:
206 return nlmsg_end(skb, nlh);
207
208 errout:
209 nlmsg_cancel(skb, nlh);
210 return -EMSGSIZE;
211 }
212 EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
213
214 static int inet_csk_diag_fill(struct sock *sk,
215 struct sk_buff *skb, 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),
221 skb, req, 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, struct inet_diag_req_v2 *req,
226 u32 portid, u32 seq, u16 nlmsg_flags,
227 const struct nlmsghdr *unlh)
228 {
229 s32 tmo;
230 struct inet_diag_msg *r;
231 struct nlmsghdr *nlh;
232
233 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
234 nlmsg_flags);
235 if (!nlh)
236 return -EMSGSIZE;
237
238 r = nlmsg_data(nlh);
239 BUG_ON(tw->tw_state != TCP_TIME_WAIT);
240
241 tmo = tw->tw_ttd - inet_tw_time_stamp();
242 if (tmo < 0)
243 tmo = 0;
244
245 r->idiag_family = tw->tw_family;
246 r->idiag_retrans = 0;
247
248 r->id.idiag_if = tw->tw_bound_dev_if;
249 sock_diag_save_cookie(tw, r->id.idiag_cookie);
250
251 r->id.idiag_sport = tw->tw_sport;
252 r->id.idiag_dport = tw->tw_dport;
253
254 memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
255 memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
256
257 r->id.idiag_src[0] = tw->tw_rcv_saddr;
258 r->id.idiag_dst[0] = tw->tw_daddr;
259
260 r->idiag_state = tw->tw_substate;
261 r->idiag_timer = 3;
262 r->idiag_expires = jiffies_to_msecs(tmo);
263 r->idiag_rqueue = 0;
264 r->idiag_wqueue = 0;
265 r->idiag_uid = 0;
266 r->idiag_inode = 0;
267 #if IS_ENABLED(CONFIG_IPV6)
268 if (tw->tw_family == AF_INET6) {
269 *(struct in6_addr *)r->id.idiag_src = tw->tw_v6_rcv_saddr;
270 *(struct in6_addr *)r->id.idiag_dst = tw->tw_v6_daddr;
271 }
272 #endif
273
274 return nlmsg_end(skb, nlh);
275 }
276
277 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
278 struct inet_diag_req_v2 *r,
279 struct user_namespace *user_ns,
280 u32 portid, u32 seq, u16 nlmsg_flags,
281 const struct nlmsghdr *unlh)
282 {
283 if (sk->sk_state == TCP_TIME_WAIT)
284 return inet_twsk_diag_fill(inet_twsk(sk), skb, r, portid, seq,
285 nlmsg_flags, unlh);
286
287 return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq,
288 nlmsg_flags, unlh);
289 }
290
291 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *in_skb,
292 const struct nlmsghdr *nlh, struct inet_diag_req_v2 *req)
293 {
294 int err;
295 struct sock *sk;
296 struct sk_buff *rep;
297 struct net *net = sock_net(in_skb->sk);
298
299 err = -EINVAL;
300 if (req->sdiag_family == AF_INET) {
301 sk = inet_lookup(net, hashinfo, req->id.idiag_dst[0],
302 req->id.idiag_dport, req->id.idiag_src[0],
303 req->id.idiag_sport, req->id.idiag_if);
304 }
305 #if IS_ENABLED(CONFIG_IPV6)
306 else if (req->sdiag_family == AF_INET6) {
307 sk = inet6_lookup(net, hashinfo,
308 (struct in6_addr *)req->id.idiag_dst,
309 req->id.idiag_dport,
310 (struct in6_addr *)req->id.idiag_src,
311 req->id.idiag_sport,
312 req->id.idiag_if);
313 }
314 #endif
315 else {
316 goto out_nosk;
317 }
318
319 err = -ENOENT;
320 if (sk == NULL)
321 goto out_nosk;
322
323 err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
324 if (err)
325 goto out;
326
327 rep = nlmsg_new(sizeof(struct inet_diag_msg) +
328 sizeof(struct inet_diag_meminfo) +
329 sizeof(struct tcp_info) + 64, GFP_KERNEL);
330 if (!rep) {
331 err = -ENOMEM;
332 goto out;
333 }
334
335 err = sk_diag_fill(sk, rep, req,
336 sk_user_ns(NETLINK_CB(in_skb).sk),
337 NETLINK_CB(in_skb).portid,
338 nlh->nlmsg_seq, 0, nlh);
339 if (err < 0) {
340 WARN_ON(err == -EMSGSIZE);
341 nlmsg_free(rep);
342 goto out;
343 }
344 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
345 MSG_DONTWAIT);
346 if (err > 0)
347 err = 0;
348
349 out:
350 if (sk)
351 sock_gen_put(sk);
352
353 out_nosk:
354 return err;
355 }
356 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
357
358 static int inet_diag_get_exact(struct sk_buff *in_skb,
359 const struct nlmsghdr *nlh,
360 struct inet_diag_req_v2 *req)
361 {
362 const struct inet_diag_handler *handler;
363 int err;
364
365 handler = inet_diag_lock_handler(req->sdiag_protocol);
366 if (IS_ERR(handler))
367 err = PTR_ERR(handler);
368 else
369 err = handler->dump_one(in_skb, nlh, req);
370 inet_diag_unlock_handler(handler);
371
372 return err;
373 }
374
375 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
376 {
377 int words = bits >> 5;
378
379 bits &= 0x1f;
380
381 if (words) {
382 if (memcmp(a1, a2, words << 2))
383 return 0;
384 }
385 if (bits) {
386 __be32 w1, w2;
387 __be32 mask;
388
389 w1 = a1[words];
390 w2 = a2[words];
391
392 mask = htonl((0xffffffff) << (32 - bits));
393
394 if ((w1 ^ w2) & mask)
395 return 0;
396 }
397
398 return 1;
399 }
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 struct inet_diag_hostcond *cond;
436 __be32 *addr;
437
438 cond = (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_diag_entry entry;
490 struct inet_sock *inet = inet_sk(sk);
491
492 if (bc == NULL)
493 return 1;
494
495 entry.family = sk->sk_family;
496 #if IS_ENABLED(CONFIG_IPV6)
497 if (entry.family == AF_INET6) {
498
499 entry.saddr = sk->sk_v6_rcv_saddr.s6_addr32;
500 entry.daddr = sk->sk_v6_daddr.s6_addr32;
501 } else
502 #endif
503 {
504 entry.saddr = &inet->inet_rcv_saddr;
505 entry.daddr = &inet->inet_daddr;
506 }
507 entry.sport = inet->inet_num;
508 entry.dport = ntohs(inet->inet_dport);
509 entry.userlocks = sk->sk_userlocks;
510
511 return inet_diag_bc_run(bc, &entry);
512 }
513 EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
514
515 static int valid_cc(const void *bc, int len, int cc)
516 {
517 while (len >= 0) {
518 const struct inet_diag_bc_op *op = bc;
519
520 if (cc > len)
521 return 0;
522 if (cc == len)
523 return 1;
524 if (op->yes < 4 || op->yes & 3)
525 return 0;
526 len -= op->yes;
527 bc += op->yes;
528 }
529 return 0;
530 }
531
532 /* Validate an inet_diag_hostcond. */
533 static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
534 int *min_len)
535 {
536 int addr_len;
537 struct inet_diag_hostcond *cond;
538
539 /* Check hostcond space. */
540 *min_len += sizeof(struct inet_diag_hostcond);
541 if (len < *min_len)
542 return false;
543 cond = (struct inet_diag_hostcond *)(op + 1);
544
545 /* Check address family and address length. */
546 switch (cond->family) {
547 case AF_UNSPEC:
548 addr_len = 0;
549 break;
550 case AF_INET:
551 addr_len = sizeof(struct in_addr);
552 break;
553 case AF_INET6:
554 addr_len = sizeof(struct in6_addr);
555 break;
556 default:
557 return false;
558 }
559 *min_len += addr_len;
560 if (len < *min_len)
561 return false;
562
563 /* Check prefix length (in bits) vs address length (in bytes). */
564 if (cond->prefix_len > 8 * addr_len)
565 return false;
566
567 return true;
568 }
569
570 /* Validate a port comparison operator. */
571 static inline bool valid_port_comparison(const struct inet_diag_bc_op *op,
572 int len, int *min_len)
573 {
574 /* Port comparisons put the port in a follow-on inet_diag_bc_op. */
575 *min_len += sizeof(struct inet_diag_bc_op);
576 if (len < *min_len)
577 return false;
578 return true;
579 }
580
581 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
582 {
583 const void *bc = bytecode;
584 int len = bytecode_len;
585
586 while (len > 0) {
587 const struct inet_diag_bc_op *op = bc;
588 int min_len = sizeof(struct inet_diag_bc_op);
589
590 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
591 switch (op->code) {
592 case INET_DIAG_BC_S_COND:
593 case INET_DIAG_BC_D_COND:
594 if (!valid_hostcond(bc, len, &min_len))
595 return -EINVAL;
596 break;
597 case INET_DIAG_BC_S_GE:
598 case INET_DIAG_BC_S_LE:
599 case INET_DIAG_BC_D_GE:
600 case INET_DIAG_BC_D_LE:
601 if (!valid_port_comparison(bc, len, &min_len))
602 return -EINVAL;
603 break;
604 case INET_DIAG_BC_AUTO:
605 case INET_DIAG_BC_JMP:
606 case INET_DIAG_BC_NOP:
607 break;
608 default:
609 return -EINVAL;
610 }
611
612 if (op->code != INET_DIAG_BC_NOP) {
613 if (op->no < min_len || op->no > len + 4 || op->no & 3)
614 return -EINVAL;
615 if (op->no < len &&
616 !valid_cc(bytecode, bytecode_len, len - op->no))
617 return -EINVAL;
618 }
619
620 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
621 return -EINVAL;
622 bc += op->yes;
623 len -= op->yes;
624 }
625 return len == 0 ? 0 : -EINVAL;
626 }
627
628 static int inet_csk_diag_dump(struct sock *sk,
629 struct sk_buff *skb,
630 struct netlink_callback *cb,
631 struct inet_diag_req_v2 *r,
632 const struct nlattr *bc)
633 {
634 if (!inet_diag_bc_sk(bc, sk))
635 return 0;
636
637 return inet_csk_diag_fill(sk, skb, r,
638 sk_user_ns(NETLINK_CB(cb->skb).sk),
639 NETLINK_CB(cb->skb).portid,
640 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
641 }
642
643 static int inet_twsk_diag_dump(struct sock *sk,
644 struct sk_buff *skb,
645 struct netlink_callback *cb,
646 struct inet_diag_req_v2 *r,
647 const struct nlattr *bc)
648 {
649 struct inet_timewait_sock *tw = inet_twsk(sk);
650
651 if (bc != NULL) {
652 struct inet_diag_entry entry;
653
654 entry.family = tw->tw_family;
655 #if IS_ENABLED(CONFIG_IPV6)
656 if (tw->tw_family == AF_INET6) {
657 entry.saddr = tw->tw_v6_rcv_saddr.s6_addr32;
658 entry.daddr = tw->tw_v6_daddr.s6_addr32;
659 } else
660 #endif
661 {
662 entry.saddr = &tw->tw_rcv_saddr;
663 entry.daddr = &tw->tw_daddr;
664 }
665 entry.sport = tw->tw_num;
666 entry.dport = ntohs(tw->tw_dport);
667 entry.userlocks = 0;
668
669 if (!inet_diag_bc_run(bc, &entry))
670 return 0;
671 }
672
673 return inet_twsk_diag_fill(tw, skb, r,
674 NETLINK_CB(cb->skb).portid,
675 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
676 }
677
678 /* Get the IPv4, IPv6, or IPv4-mapped-IPv6 local and remote addresses
679 * from a request_sock. For IPv4-mapped-IPv6 we must map IPv4 to IPv6.
680 */
681 static inline void inet_diag_req_addrs(const struct sock *sk,
682 const struct request_sock *req,
683 struct inet_diag_entry *entry)
684 {
685 struct inet_request_sock *ireq = inet_rsk(req);
686
687 #if IS_ENABLED(CONFIG_IPV6)
688 if (sk->sk_family == AF_INET6) {
689 if (req->rsk_ops->family == AF_INET6) {
690 entry->saddr = ireq->ir_v6_loc_addr.s6_addr32;
691 entry->daddr = ireq->ir_v6_rmt_addr.s6_addr32;
692 } else if (req->rsk_ops->family == AF_INET) {
693 ipv6_addr_set_v4mapped(ireq->ir_loc_addr,
694 &entry->saddr_storage);
695 ipv6_addr_set_v4mapped(ireq->ir_rmt_addr,
696 &entry->daddr_storage);
697 entry->saddr = entry->saddr_storage.s6_addr32;
698 entry->daddr = entry->daddr_storage.s6_addr32;
699 }
700 } else
701 #endif
702 {
703 entry->saddr = &ireq->ir_loc_addr;
704 entry->daddr = &ireq->ir_rmt_addr;
705 }
706 }
707
708 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
709 struct request_sock *req,
710 struct user_namespace *user_ns,
711 u32 portid, u32 seq,
712 const struct nlmsghdr *unlh)
713 {
714 const struct inet_request_sock *ireq = inet_rsk(req);
715 struct inet_sock *inet = inet_sk(sk);
716 struct inet_diag_msg *r;
717 struct nlmsghdr *nlh;
718 long tmo;
719
720 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
721 NLM_F_MULTI);
722 if (!nlh)
723 return -EMSGSIZE;
724
725 r = nlmsg_data(nlh);
726 r->idiag_family = sk->sk_family;
727 r->idiag_state = TCP_SYN_RECV;
728 r->idiag_timer = 1;
729 r->idiag_retrans = req->num_retrans;
730
731 r->id.idiag_if = sk->sk_bound_dev_if;
732 sock_diag_save_cookie(req, r->id.idiag_cookie);
733
734 tmo = req->expires - jiffies;
735 if (tmo < 0)
736 tmo = 0;
737
738 r->id.idiag_sport = inet->inet_sport;
739 r->id.idiag_dport = ireq->ir_rmt_port;
740
741 memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
742 memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
743
744 r->id.idiag_src[0] = ireq->ir_loc_addr;
745 r->id.idiag_dst[0] = ireq->ir_rmt_addr;
746
747 r->idiag_expires = jiffies_to_msecs(tmo);
748 r->idiag_rqueue = 0;
749 r->idiag_wqueue = 0;
750 r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
751 r->idiag_inode = 0;
752 #if IS_ENABLED(CONFIG_IPV6)
753 if (r->idiag_family == AF_INET6) {
754 struct inet_diag_entry entry;
755 inet_diag_req_addrs(sk, req, &entry);
756 memcpy(r->id.idiag_src, entry.saddr, sizeof(struct in6_addr));
757 memcpy(r->id.idiag_dst, entry.daddr, sizeof(struct in6_addr));
758 }
759 #endif
760
761 return nlmsg_end(skb, nlh);
762 }
763
764 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
765 struct netlink_callback *cb,
766 struct inet_diag_req_v2 *r,
767 const struct nlattr *bc)
768 {
769 struct inet_diag_entry entry;
770 struct inet_connection_sock *icsk = inet_csk(sk);
771 struct listen_sock *lopt;
772 struct inet_sock *inet = inet_sk(sk);
773 int j, s_j;
774 int reqnum, s_reqnum;
775 int err = 0;
776
777 s_j = cb->args[3];
778 s_reqnum = cb->args[4];
779
780 if (s_j > 0)
781 s_j--;
782
783 entry.family = sk->sk_family;
784
785 read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
786
787 lopt = icsk->icsk_accept_queue.listen_opt;
788 if (!lopt || !lopt->qlen)
789 goto out;
790
791 if (bc != NULL) {
792 entry.sport = inet->inet_num;
793 entry.userlocks = sk->sk_userlocks;
794 }
795
796 for (j = s_j; j < lopt->nr_table_entries; j++) {
797 struct request_sock *req, *head = lopt->syn_table[j];
798
799 reqnum = 0;
800 for (req = head; req; reqnum++, req = req->dl_next) {
801 struct inet_request_sock *ireq = inet_rsk(req);
802
803 if (reqnum < s_reqnum)
804 continue;
805 if (r->id.idiag_dport != ireq->ir_rmt_port &&
806 r->id.idiag_dport)
807 continue;
808
809 if (bc) {
810 inet_diag_req_addrs(sk, req, &entry);
811 entry.dport = ntohs(ireq->ir_rmt_port);
812
813 if (!inet_diag_bc_run(bc, &entry))
814 continue;
815 }
816
817 err = inet_diag_fill_req(skb, sk, req,
818 sk_user_ns(NETLINK_CB(cb->skb).sk),
819 NETLINK_CB(cb->skb).portid,
820 cb->nlh->nlmsg_seq, cb->nlh);
821 if (err < 0) {
822 cb->args[3] = j + 1;
823 cb->args[4] = reqnum;
824 goto out;
825 }
826 }
827
828 s_reqnum = 0;
829 }
830
831 out:
832 read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
833
834 return err;
835 }
836
837 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
838 struct netlink_callback *cb, struct inet_diag_req_v2 *r, struct nlattr *bc)
839 {
840 int i, num;
841 int s_i, s_num;
842 struct net *net = sock_net(skb->sk);
843
844 s_i = cb->args[1];
845 s_num = num = cb->args[2];
846
847 if (cb->args[0] == 0) {
848 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
849 goto skip_listen_ht;
850
851 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
852 struct sock *sk;
853 struct hlist_nulls_node *node;
854 struct inet_listen_hashbucket *ilb;
855
856 num = 0;
857 ilb = &hashinfo->listening_hash[i];
858 spin_lock_bh(&ilb->lock);
859 sk_nulls_for_each(sk, node, &ilb->head) {
860 struct inet_sock *inet = inet_sk(sk);
861
862 if (!net_eq(sock_net(sk), net))
863 continue;
864
865 if (num < s_num) {
866 num++;
867 continue;
868 }
869
870 if (r->sdiag_family != AF_UNSPEC &&
871 sk->sk_family != r->sdiag_family)
872 goto next_listen;
873
874 if (r->id.idiag_sport != inet->inet_sport &&
875 r->id.idiag_sport)
876 goto next_listen;
877
878 if (!(r->idiag_states & TCPF_LISTEN) ||
879 r->id.idiag_dport ||
880 cb->args[3] > 0)
881 goto syn_recv;
882
883 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
884 spin_unlock_bh(&ilb->lock);
885 goto done;
886 }
887
888 syn_recv:
889 if (!(r->idiag_states & TCPF_SYN_RECV))
890 goto next_listen;
891
892 if (inet_diag_dump_reqs(skb, sk, cb, r, bc) < 0) {
893 spin_unlock_bh(&ilb->lock);
894 goto done;
895 }
896
897 next_listen:
898 cb->args[3] = 0;
899 cb->args[4] = 0;
900 ++num;
901 }
902 spin_unlock_bh(&ilb->lock);
903
904 s_num = 0;
905 cb->args[3] = 0;
906 cb->args[4] = 0;
907 }
908 skip_listen_ht:
909 cb->args[0] = 1;
910 s_i = num = s_num = 0;
911 }
912
913 if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
914 goto out;
915
916 for (i = s_i; i <= hashinfo->ehash_mask; i++) {
917 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
918 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
919 struct sock *sk;
920 struct hlist_nulls_node *node;
921
922 num = 0;
923
924 if (hlist_nulls_empty(&head->chain))
925 continue;
926
927 if (i > s_i)
928 s_num = 0;
929
930 spin_lock_bh(lock);
931 sk_nulls_for_each(sk, node, &head->chain) {
932 int res;
933 int state;
934
935 if (!net_eq(sock_net(sk), net))
936 continue;
937 if (num < s_num)
938 goto next_normal;
939 state = (sk->sk_state == TCP_TIME_WAIT) ?
940 inet_twsk(sk)->tw_substate : sk->sk_state;
941 if (!(r->idiag_states & (1 << state)))
942 goto next_normal;
943 if (r->sdiag_family != AF_UNSPEC &&
944 sk->sk_family != r->sdiag_family)
945 goto next_normal;
946 if (r->id.idiag_sport != htons(sk->sk_num) &&
947 r->id.idiag_sport)
948 goto next_normal;
949 if (r->id.idiag_dport != sk->sk_dport &&
950 r->id.idiag_dport)
951 goto next_normal;
952 if (sk->sk_state == TCP_TIME_WAIT)
953 res = inet_twsk_diag_dump(sk, skb, cb, r, bc);
954 else
955 res = inet_csk_diag_dump(sk, skb, cb, r, bc);
956 if (res < 0) {
957 spin_unlock_bh(lock);
958 goto done;
959 }
960 next_normal:
961 ++num;
962 }
963
964 spin_unlock_bh(lock);
965 }
966
967 done:
968 cb->args[1] = i;
969 cb->args[2] = num;
970 out:
971 ;
972 }
973 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
974
975 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
976 struct inet_diag_req_v2 *r, struct nlattr *bc)
977 {
978 const struct inet_diag_handler *handler;
979 int err = 0;
980
981 handler = inet_diag_lock_handler(r->sdiag_protocol);
982 if (!IS_ERR(handler))
983 handler->dump(skb, cb, r, bc);
984 else
985 err = PTR_ERR(handler);
986 inet_diag_unlock_handler(handler);
987
988 return err ? : skb->len;
989 }
990
991 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
992 {
993 struct nlattr *bc = NULL;
994 int hdrlen = sizeof(struct inet_diag_req_v2);
995
996 if (nlmsg_attrlen(cb->nlh, hdrlen))
997 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
998
999 return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
1000 }
1001
1002 static inline int inet_diag_type2proto(int type)
1003 {
1004 switch (type) {
1005 case TCPDIAG_GETSOCK:
1006 return IPPROTO_TCP;
1007 case DCCPDIAG_GETSOCK:
1008 return IPPROTO_DCCP;
1009 default:
1010 return 0;
1011 }
1012 }
1013
1014 static int inet_diag_dump_compat(struct sk_buff *skb, struct netlink_callback *cb)
1015 {
1016 struct inet_diag_req *rc = nlmsg_data(cb->nlh);
1017 struct inet_diag_req_v2 req;
1018 struct nlattr *bc = NULL;
1019 int hdrlen = sizeof(struct inet_diag_req);
1020
1021 req.sdiag_family = AF_UNSPEC; /* compatibility */
1022 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
1023 req.idiag_ext = rc->idiag_ext;
1024 req.idiag_states = rc->idiag_states;
1025 req.id = rc->id;
1026
1027 if (nlmsg_attrlen(cb->nlh, hdrlen))
1028 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
1029
1030 return __inet_diag_dump(skb, cb, &req, bc);
1031 }
1032
1033 static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
1034 const struct nlmsghdr *nlh)
1035 {
1036 struct inet_diag_req *rc = nlmsg_data(nlh);
1037 struct inet_diag_req_v2 req;
1038
1039 req.sdiag_family = rc->idiag_family;
1040 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
1041 req.idiag_ext = rc->idiag_ext;
1042 req.idiag_states = rc->idiag_states;
1043 req.id = rc->id;
1044
1045 return inet_diag_get_exact(in_skb, nlh, &req);
1046 }
1047
1048 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
1049 {
1050 int hdrlen = sizeof(struct inet_diag_req);
1051 struct net *net = sock_net(skb->sk);
1052
1053 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
1054 nlmsg_len(nlh) < hdrlen)
1055 return -EINVAL;
1056
1057 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1058 if (nlmsg_attrlen(nlh, hdrlen)) {
1059 struct nlattr *attr;
1060
1061 attr = nlmsg_find_attr(nlh, hdrlen,
1062 INET_DIAG_REQ_BYTECODE);
1063 if (attr == NULL ||
1064 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
1065 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
1066 return -EINVAL;
1067 }
1068 {
1069 struct netlink_dump_control c = {
1070 .dump = inet_diag_dump_compat,
1071 };
1072 return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
1073 }
1074 }
1075
1076 return inet_diag_get_exact_compat(skb, nlh);
1077 }
1078
1079 static int inet_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
1080 {
1081 int hdrlen = sizeof(struct inet_diag_req_v2);
1082 struct net *net = sock_net(skb->sk);
1083
1084 if (nlmsg_len(h) < hdrlen)
1085 return -EINVAL;
1086
1087 if (h->nlmsg_flags & NLM_F_DUMP) {
1088 if (nlmsg_attrlen(h, hdrlen)) {
1089 struct nlattr *attr;
1090 attr = nlmsg_find_attr(h, hdrlen,
1091 INET_DIAG_REQ_BYTECODE);
1092 if (attr == NULL ||
1093 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
1094 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
1095 return -EINVAL;
1096 }
1097 {
1098 struct netlink_dump_control c = {
1099 .dump = inet_diag_dump,
1100 };
1101 return netlink_dump_start(net->diag_nlsk, skb, h, &c);
1102 }
1103 }
1104
1105 return inet_diag_get_exact(skb, h, nlmsg_data(h));
1106 }
1107
1108 static const struct sock_diag_handler inet_diag_handler = {
1109 .family = AF_INET,
1110 .dump = inet_diag_handler_dump,
1111 };
1112
1113 static const struct sock_diag_handler inet6_diag_handler = {
1114 .family = AF_INET6,
1115 .dump = inet_diag_handler_dump,
1116 };
1117
1118 int inet_diag_register(const struct inet_diag_handler *h)
1119 {
1120 const __u16 type = h->idiag_type;
1121 int err = -EINVAL;
1122
1123 if (type >= IPPROTO_MAX)
1124 goto out;
1125
1126 mutex_lock(&inet_diag_table_mutex);
1127 err = -EEXIST;
1128 if (inet_diag_table[type] == NULL) {
1129 inet_diag_table[type] = h;
1130 err = 0;
1131 }
1132 mutex_unlock(&inet_diag_table_mutex);
1133 out:
1134 return err;
1135 }
1136 EXPORT_SYMBOL_GPL(inet_diag_register);
1137
1138 void inet_diag_unregister(const struct inet_diag_handler *h)
1139 {
1140 const __u16 type = h->idiag_type;
1141
1142 if (type >= IPPROTO_MAX)
1143 return;
1144
1145 mutex_lock(&inet_diag_table_mutex);
1146 inet_diag_table[type] = NULL;
1147 mutex_unlock(&inet_diag_table_mutex);
1148 }
1149 EXPORT_SYMBOL_GPL(inet_diag_unregister);
1150
1151 static int __init inet_diag_init(void)
1152 {
1153 const int inet_diag_table_size = (IPPROTO_MAX *
1154 sizeof(struct inet_diag_handler *));
1155 int err = -ENOMEM;
1156
1157 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1158 if (!inet_diag_table)
1159 goto out;
1160
1161 err = sock_diag_register(&inet_diag_handler);
1162 if (err)
1163 goto out_free_nl;
1164
1165 err = sock_diag_register(&inet6_diag_handler);
1166 if (err)
1167 goto out_free_inet;
1168
1169 sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1170 out:
1171 return err;
1172
1173 out_free_inet:
1174 sock_diag_unregister(&inet_diag_handler);
1175 out_free_nl:
1176 kfree(inet_diag_table);
1177 goto out;
1178 }
1179
1180 static void __exit inet_diag_exit(void)
1181 {
1182 sock_diag_unregister(&inet6_diag_handler);
1183 sock_diag_unregister(&inet_diag_handler);
1184 sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1185 kfree(inet_diag_table);
1186 }
1187
1188 module_init(inet_diag_init);
1189 module_exit(inet_diag_exit);
1190 MODULE_LICENSE("GPL");
1191 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1192 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);
Linux kernel - Deliverables
This page took 0.07392 seconds and 4 git commands to generate.