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[deliverable/linux.git] / net / ipv4 / inet_diag.c
1 /*
2 * inet_diag.c Module for monitoring INET transport protocols sockets.
3 *
4 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/types.h>
15 #include <linux/fcntl.h>
16 #include <linux/random.h>
17 #include <linux/slab.h>
18 #include <linux/cache.h>
19 #include <linux/init.h>
20 #include <linux/time.h>
21
22 #include <net/icmp.h>
23 #include <net/tcp.h>
24 #include <net/ipv6.h>
25 #include <net/inet_common.h>
26 #include <net/inet_connection_sock.h>
27 #include <net/inet_hashtables.h>
28 #include <net/inet_timewait_sock.h>
29 #include <net/inet6_hashtables.h>
30 #include <net/netlink.h>
31
32 #include <linux/inet.h>
33 #include <linux/stddef.h>
34
35 #include <linux/inet_diag.h>
36 #include <linux/sock_diag.h>
37
38 static const struct inet_diag_handler **inet_diag_table;
39
40 struct inet_diag_entry {
41 __be32 *saddr;
42 __be32 *daddr;
43 u16 sport;
44 u16 dport;
45 u16 family;
46 u16 userlocks;
47 #if IS_ENABLED(CONFIG_IPV6)
48 struct in6_addr saddr_storage; /* for IPv4-mapped-IPv6 addresses */
49 struct in6_addr daddr_storage; /* for IPv4-mapped-IPv6 addresses */
50 #endif
51 };
52
53 static DEFINE_MUTEX(inet_diag_table_mutex);
54
55 static const struct inet_diag_handler *inet_diag_lock_handler(int proto)
56 {
57 if (!inet_diag_table[proto])
58 request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK,
59 NETLINK_SOCK_DIAG, AF_INET, proto);
60
61 mutex_lock(&inet_diag_table_mutex);
62 if (!inet_diag_table[proto])
63 return ERR_PTR(-ENOENT);
64
65 return inet_diag_table[proto];
66 }
67
68 static inline void inet_diag_unlock_handler(
69 const struct inet_diag_handler *handler)
70 {
71 mutex_unlock(&inet_diag_table_mutex);
72 }
73
74 int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
75 struct sk_buff *skb, struct inet_diag_req_v2 *req,
76 struct user_namespace *user_ns,
77 u32 portid, u32 seq, u16 nlmsg_flags,
78 const struct nlmsghdr *unlh)
79 {
80 const struct inet_sock *inet = inet_sk(sk);
81 struct inet_diag_msg *r;
82 struct nlmsghdr *nlh;
83 struct nlattr *attr;
84 void *info = NULL;
85 const struct inet_diag_handler *handler;
86 int ext = req->idiag_ext;
87
88 handler = inet_diag_table[req->sdiag_protocol];
89 BUG_ON(handler == NULL);
90
91 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
92 nlmsg_flags);
93 if (!nlh)
94 return -EMSGSIZE;
95
96 r = nlmsg_data(nlh);
97 BUG_ON(sk->sk_state == TCP_TIME_WAIT);
98
99 r->idiag_family = sk->sk_family;
100 r->idiag_state = sk->sk_state;
101 r->idiag_timer = 0;
102 r->idiag_retrans = 0;
103
104 r->id.idiag_if = sk->sk_bound_dev_if;
105 sock_diag_save_cookie(sk, r->id.idiag_cookie);
106
107 r->id.idiag_sport = inet->inet_sport;
108 r->id.idiag_dport = inet->inet_dport;
109 r->id.idiag_src[0] = inet->inet_rcv_saddr;
110 r->id.idiag_dst[0] = inet->inet_daddr;
111
112 /* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
113 * hence this needs to be included regardless of socket family.
114 */
115 if (ext & (1 << (INET_DIAG_TOS - 1)))
116 if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0)
117 goto errout;
118
119 #if IS_ENABLED(CONFIG_IPV6)
120 if (r->idiag_family == AF_INET6) {
121 const struct ipv6_pinfo *np = inet6_sk(sk);
122
123 *(struct in6_addr *)r->id.idiag_src = np->rcv_saddr;
124 *(struct in6_addr *)r->id.idiag_dst = np->daddr;
125
126 if (ext & (1 << (INET_DIAG_TCLASS - 1)))
127 if (nla_put_u8(skb, INET_DIAG_TCLASS, np->tclass) < 0)
128 goto errout;
129 }
130 #endif
131
132 r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
133 r->idiag_inode = sock_i_ino(sk);
134
135 if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
136 struct inet_diag_meminfo minfo = {
137 .idiag_rmem = sk_rmem_alloc_get(sk),
138 .idiag_wmem = sk->sk_wmem_queued,
139 .idiag_fmem = sk->sk_forward_alloc,
140 .idiag_tmem = sk_wmem_alloc_get(sk),
141 };
142
143 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
144 goto errout;
145 }
146
147 if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
148 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
149 goto errout;
150
151 if (icsk == NULL) {
152 handler->idiag_get_info(sk, r, NULL);
153 goto out;
154 }
155
156 #define EXPIRES_IN_MS(tmo) DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
157
158 if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
159 r->idiag_timer = 1;
160 r->idiag_retrans = icsk->icsk_retransmits;
161 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
162 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
163 r->idiag_timer = 4;
164 r->idiag_retrans = icsk->icsk_probes_out;
165 r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
166 } else if (timer_pending(&sk->sk_timer)) {
167 r->idiag_timer = 2;
168 r->idiag_retrans = icsk->icsk_probes_out;
169 r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
170 } else {
171 r->idiag_timer = 0;
172 r->idiag_expires = 0;
173 }
174 #undef EXPIRES_IN_MS
175
176 if (ext & (1 << (INET_DIAG_INFO - 1))) {
177 attr = nla_reserve(skb, INET_DIAG_INFO,
178 sizeof(struct tcp_info));
179 if (!attr)
180 goto errout;
181
182 info = nla_data(attr);
183 }
184
185 if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops)
186 if (nla_put_string(skb, INET_DIAG_CONG,
187 icsk->icsk_ca_ops->name) < 0)
188 goto errout;
189
190 handler->idiag_get_info(sk, r, info);
191
192 if (sk->sk_state < TCP_TIME_WAIT &&
193 icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
194 icsk->icsk_ca_ops->get_info(sk, ext, skb);
195
196 out:
197 return nlmsg_end(skb, nlh);
198
199 errout:
200 nlmsg_cancel(skb, nlh);
201 return -EMSGSIZE;
202 }
203 EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
204
205 static int inet_csk_diag_fill(struct sock *sk,
206 struct sk_buff *skb, struct inet_diag_req_v2 *req,
207 struct user_namespace *user_ns,
208 u32 portid, u32 seq, u16 nlmsg_flags,
209 const struct nlmsghdr *unlh)
210 {
211 return inet_sk_diag_fill(sk, inet_csk(sk),
212 skb, req, user_ns, portid, seq, nlmsg_flags, unlh);
213 }
214
215 static int inet_twsk_diag_fill(struct inet_timewait_sock *tw,
216 struct sk_buff *skb, struct inet_diag_req_v2 *req,
217 u32 portid, u32 seq, u16 nlmsg_flags,
218 const struct nlmsghdr *unlh)
219 {
220 long tmo;
221 struct inet_diag_msg *r;
222 struct nlmsghdr *nlh;
223
224 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
225 nlmsg_flags);
226 if (!nlh)
227 return -EMSGSIZE;
228
229 r = nlmsg_data(nlh);
230 BUG_ON(tw->tw_state != TCP_TIME_WAIT);
231
232 tmo = tw->tw_ttd - jiffies;
233 if (tmo < 0)
234 tmo = 0;
235
236 r->idiag_family = tw->tw_family;
237 r->idiag_retrans = 0;
238 r->id.idiag_if = tw->tw_bound_dev_if;
239 sock_diag_save_cookie(tw, r->id.idiag_cookie);
240 r->id.idiag_sport = tw->tw_sport;
241 r->id.idiag_dport = tw->tw_dport;
242 r->id.idiag_src[0] = tw->tw_rcv_saddr;
243 r->id.idiag_dst[0] = tw->tw_daddr;
244 r->idiag_state = tw->tw_substate;
245 r->idiag_timer = 3;
246 r->idiag_expires = DIV_ROUND_UP(tmo * 1000, HZ);
247 r->idiag_rqueue = 0;
248 r->idiag_wqueue = 0;
249 r->idiag_uid = 0;
250 r->idiag_inode = 0;
251 #if IS_ENABLED(CONFIG_IPV6)
252 if (tw->tw_family == AF_INET6) {
253 const struct inet6_timewait_sock *tw6 =
254 inet6_twsk((struct sock *)tw);
255
256 *(struct in6_addr *)r->id.idiag_src = tw6->tw_v6_rcv_saddr;
257 *(struct in6_addr *)r->id.idiag_dst = tw6->tw_v6_daddr;
258 }
259 #endif
260
261 return nlmsg_end(skb, nlh);
262 }
263
264 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
265 struct inet_diag_req_v2 *r,
266 struct user_namespace *user_ns,
267 u32 portid, u32 seq, u16 nlmsg_flags,
268 const struct nlmsghdr *unlh)
269 {
270 if (sk->sk_state == TCP_TIME_WAIT)
271 return inet_twsk_diag_fill((struct inet_timewait_sock *)sk,
272 skb, r, portid, seq, nlmsg_flags,
273 unlh);
274 return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq, nlmsg_flags, unlh);
275 }
276
277 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *in_skb,
278 const struct nlmsghdr *nlh, struct inet_diag_req_v2 *req)
279 {
280 int err;
281 struct sock *sk;
282 struct sk_buff *rep;
283 struct net *net = sock_net(in_skb->sk);
284
285 err = -EINVAL;
286 if (req->sdiag_family == AF_INET) {
287 sk = inet_lookup(net, hashinfo, req->id.idiag_dst[0],
288 req->id.idiag_dport, req->id.idiag_src[0],
289 req->id.idiag_sport, req->id.idiag_if);
290 }
291 #if IS_ENABLED(CONFIG_IPV6)
292 else if (req->sdiag_family == AF_INET6) {
293 sk = inet6_lookup(net, hashinfo,
294 (struct in6_addr *)req->id.idiag_dst,
295 req->id.idiag_dport,
296 (struct in6_addr *)req->id.idiag_src,
297 req->id.idiag_sport,
298 req->id.idiag_if);
299 }
300 #endif
301 else {
302 goto out_nosk;
303 }
304
305 err = -ENOENT;
306 if (sk == NULL)
307 goto out_nosk;
308
309 err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
310 if (err)
311 goto out;
312
313 rep = nlmsg_new(sizeof(struct inet_diag_msg) +
314 sizeof(struct inet_diag_meminfo) +
315 sizeof(struct tcp_info) + 64, GFP_KERNEL);
316 if (!rep) {
317 err = -ENOMEM;
318 goto out;
319 }
320
321 err = sk_diag_fill(sk, rep, req,
322 sk_user_ns(NETLINK_CB(in_skb).ssk),
323 NETLINK_CB(in_skb).portid,
324 nlh->nlmsg_seq, 0, nlh);
325 if (err < 0) {
326 WARN_ON(err == -EMSGSIZE);
327 nlmsg_free(rep);
328 goto out;
329 }
330 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
331 MSG_DONTWAIT);
332 if (err > 0)
333 err = 0;
334
335 out:
336 if (sk) {
337 if (sk->sk_state == TCP_TIME_WAIT)
338 inet_twsk_put((struct inet_timewait_sock *)sk);
339 else
340 sock_put(sk);
341 }
342 out_nosk:
343 return err;
344 }
345 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
346
347 static int inet_diag_get_exact(struct sk_buff *in_skb,
348 const struct nlmsghdr *nlh,
349 struct inet_diag_req_v2 *req)
350 {
351 const struct inet_diag_handler *handler;
352 int err;
353
354 handler = inet_diag_lock_handler(req->sdiag_protocol);
355 if (IS_ERR(handler))
356 err = PTR_ERR(handler);
357 else
358 err = handler->dump_one(in_skb, nlh, req);
359 inet_diag_unlock_handler(handler);
360
361 return err;
362 }
363
364 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
365 {
366 int words = bits >> 5;
367
368 bits &= 0x1f;
369
370 if (words) {
371 if (memcmp(a1, a2, words << 2))
372 return 0;
373 }
374 if (bits) {
375 __be32 w1, w2;
376 __be32 mask;
377
378 w1 = a1[words];
379 w2 = a2[words];
380
381 mask = htonl((0xffffffff) << (32 - bits));
382
383 if ((w1 ^ w2) & mask)
384 return 0;
385 }
386
387 return 1;
388 }
389
390
391 static int inet_diag_bc_run(const struct nlattr *_bc,
392 const struct inet_diag_entry *entry)
393 {
394 const void *bc = nla_data(_bc);
395 int len = nla_len(_bc);
396
397 while (len > 0) {
398 int yes = 1;
399 const struct inet_diag_bc_op *op = bc;
400
401 switch (op->code) {
402 case INET_DIAG_BC_NOP:
403 break;
404 case INET_DIAG_BC_JMP:
405 yes = 0;
406 break;
407 case INET_DIAG_BC_S_GE:
408 yes = entry->sport >= op[1].no;
409 break;
410 case INET_DIAG_BC_S_LE:
411 yes = entry->sport <= op[1].no;
412 break;
413 case INET_DIAG_BC_D_GE:
414 yes = entry->dport >= op[1].no;
415 break;
416 case INET_DIAG_BC_D_LE:
417 yes = entry->dport <= op[1].no;
418 break;
419 case INET_DIAG_BC_AUTO:
420 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
421 break;
422 case INET_DIAG_BC_S_COND:
423 case INET_DIAG_BC_D_COND: {
424 struct inet_diag_hostcond *cond;
425 __be32 *addr;
426
427 cond = (struct inet_diag_hostcond *)(op + 1);
428 if (cond->port != -1 &&
429 cond->port != (op->code == INET_DIAG_BC_S_COND ?
430 entry->sport : entry->dport)) {
431 yes = 0;
432 break;
433 }
434
435 if (cond->prefix_len == 0)
436 break;
437
438 if (op->code == INET_DIAG_BC_S_COND)
439 addr = entry->saddr;
440 else
441 addr = entry->daddr;
442
443 if (bitstring_match(addr, cond->addr,
444 cond->prefix_len))
445 break;
446 if (entry->family == AF_INET6 &&
447 cond->family == AF_INET) {
448 if (addr[0] == 0 && addr[1] == 0 &&
449 addr[2] == htonl(0xffff) &&
450 bitstring_match(addr + 3, cond->addr,
451 cond->prefix_len))
452 break;
453 }
454 yes = 0;
455 break;
456 }
457 }
458
459 if (yes) {
460 len -= op->yes;
461 bc += op->yes;
462 } else {
463 len -= op->no;
464 bc += op->no;
465 }
466 }
467 return len == 0;
468 }
469
470 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
471 {
472 struct inet_diag_entry entry;
473 struct inet_sock *inet = inet_sk(sk);
474
475 if (bc == NULL)
476 return 1;
477
478 entry.family = sk->sk_family;
479 #if IS_ENABLED(CONFIG_IPV6)
480 if (entry.family == AF_INET6) {
481 struct ipv6_pinfo *np = inet6_sk(sk);
482
483 entry.saddr = np->rcv_saddr.s6_addr32;
484 entry.daddr = np->daddr.s6_addr32;
485 } else
486 #endif
487 {
488 entry.saddr = &inet->inet_rcv_saddr;
489 entry.daddr = &inet->inet_daddr;
490 }
491 entry.sport = inet->inet_num;
492 entry.dport = ntohs(inet->inet_dport);
493 entry.userlocks = sk->sk_userlocks;
494
495 return inet_diag_bc_run(bc, &entry);
496 }
497 EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
498
499 static int valid_cc(const void *bc, int len, int cc)
500 {
501 while (len >= 0) {
502 const struct inet_diag_bc_op *op = bc;
503
504 if (cc > len)
505 return 0;
506 if (cc == len)
507 return 1;
508 if (op->yes < 4 || op->yes & 3)
509 return 0;
510 len -= op->yes;
511 bc += op->yes;
512 }
513 return 0;
514 }
515
516 static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
517 {
518 const void *bc = bytecode;
519 int len = bytecode_len;
520
521 while (len > 0) {
522 const struct inet_diag_bc_op *op = bc;
523
524 //printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
525 switch (op->code) {
526 case INET_DIAG_BC_AUTO:
527 case INET_DIAG_BC_S_COND:
528 case INET_DIAG_BC_D_COND:
529 case INET_DIAG_BC_S_GE:
530 case INET_DIAG_BC_S_LE:
531 case INET_DIAG_BC_D_GE:
532 case INET_DIAG_BC_D_LE:
533 case INET_DIAG_BC_JMP:
534 if (op->no < 4 || op->no > len + 4 || op->no & 3)
535 return -EINVAL;
536 if (op->no < len &&
537 !valid_cc(bytecode, bytecode_len, len - op->no))
538 return -EINVAL;
539 break;
540 case INET_DIAG_BC_NOP:
541 break;
542 default:
543 return -EINVAL;
544 }
545 if (op->yes < 4 || op->yes > len + 4 || op->yes & 3)
546 return -EINVAL;
547 bc += op->yes;
548 len -= op->yes;
549 }
550 return len == 0 ? 0 : -EINVAL;
551 }
552
553 static int inet_csk_diag_dump(struct sock *sk,
554 struct sk_buff *skb,
555 struct netlink_callback *cb,
556 struct inet_diag_req_v2 *r,
557 const struct nlattr *bc)
558 {
559 if (!inet_diag_bc_sk(bc, sk))
560 return 0;
561
562 return inet_csk_diag_fill(sk, skb, r,
563 sk_user_ns(NETLINK_CB(cb->skb).ssk),
564 NETLINK_CB(cb->skb).portid,
565 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
566 }
567
568 static int inet_twsk_diag_dump(struct inet_timewait_sock *tw,
569 struct sk_buff *skb,
570 struct netlink_callback *cb,
571 struct inet_diag_req_v2 *r,
572 const struct nlattr *bc)
573 {
574 if (bc != NULL) {
575 struct inet_diag_entry entry;
576
577 entry.family = tw->tw_family;
578 #if IS_ENABLED(CONFIG_IPV6)
579 if (tw->tw_family == AF_INET6) {
580 struct inet6_timewait_sock *tw6 =
581 inet6_twsk((struct sock *)tw);
582 entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32;
583 entry.daddr = tw6->tw_v6_daddr.s6_addr32;
584 } else
585 #endif
586 {
587 entry.saddr = &tw->tw_rcv_saddr;
588 entry.daddr = &tw->tw_daddr;
589 }
590 entry.sport = tw->tw_num;
591 entry.dport = ntohs(tw->tw_dport);
592 entry.userlocks = 0;
593
594 if (!inet_diag_bc_run(bc, &entry))
595 return 0;
596 }
597
598 return inet_twsk_diag_fill(tw, skb, r,
599 NETLINK_CB(cb->skb).portid,
600 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
601 }
602
603 /* Get the IPv4, IPv6, or IPv4-mapped-IPv6 local and remote addresses
604 * from a request_sock. For IPv4-mapped-IPv6 we must map IPv4 to IPv6.
605 */
606 static inline void inet_diag_req_addrs(const struct sock *sk,
607 const struct request_sock *req,
608 struct inet_diag_entry *entry)
609 {
610 struct inet_request_sock *ireq = inet_rsk(req);
611
612 #if IS_ENABLED(CONFIG_IPV6)
613 if (sk->sk_family == AF_INET6) {
614 if (req->rsk_ops->family == AF_INET6) {
615 entry->saddr = inet6_rsk(req)->loc_addr.s6_addr32;
616 entry->daddr = inet6_rsk(req)->rmt_addr.s6_addr32;
617 } else if (req->rsk_ops->family == AF_INET) {
618 ipv6_addr_set_v4mapped(ireq->loc_addr,
619 &entry->saddr_storage);
620 ipv6_addr_set_v4mapped(ireq->rmt_addr,
621 &entry->daddr_storage);
622 entry->saddr = entry->saddr_storage.s6_addr32;
623 entry->daddr = entry->daddr_storage.s6_addr32;
624 }
625 } else
626 #endif
627 {
628 entry->saddr = &ireq->loc_addr;
629 entry->daddr = &ireq->rmt_addr;
630 }
631 }
632
633 static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
634 struct request_sock *req,
635 struct user_namespace *user_ns,
636 u32 portid, u32 seq,
637 const struct nlmsghdr *unlh)
638 {
639 const struct inet_request_sock *ireq = inet_rsk(req);
640 struct inet_sock *inet = inet_sk(sk);
641 struct inet_diag_msg *r;
642 struct nlmsghdr *nlh;
643 long tmo;
644
645 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
646 NLM_F_MULTI);
647 if (!nlh)
648 return -EMSGSIZE;
649
650 r = nlmsg_data(nlh);
651 r->idiag_family = sk->sk_family;
652 r->idiag_state = TCP_SYN_RECV;
653 r->idiag_timer = 1;
654 r->idiag_retrans = req->retrans;
655
656 r->id.idiag_if = sk->sk_bound_dev_if;
657 sock_diag_save_cookie(req, r->id.idiag_cookie);
658
659 tmo = req->expires - jiffies;
660 if (tmo < 0)
661 tmo = 0;
662
663 r->id.idiag_sport = inet->inet_sport;
664 r->id.idiag_dport = ireq->rmt_port;
665 r->id.idiag_src[0] = ireq->loc_addr;
666 r->id.idiag_dst[0] = ireq->rmt_addr;
667 r->idiag_expires = jiffies_to_msecs(tmo);
668 r->idiag_rqueue = 0;
669 r->idiag_wqueue = 0;
670 r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
671 r->idiag_inode = 0;
672 #if IS_ENABLED(CONFIG_IPV6)
673 if (r->idiag_family == AF_INET6) {
674 struct inet_diag_entry entry;
675 inet_diag_req_addrs(sk, req, &entry);
676 memcpy(r->id.idiag_src, entry.saddr, sizeof(struct in6_addr));
677 memcpy(r->id.idiag_dst, entry.daddr, sizeof(struct in6_addr));
678 }
679 #endif
680
681 return nlmsg_end(skb, nlh);
682 }
683
684 static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
685 struct netlink_callback *cb,
686 struct inet_diag_req_v2 *r,
687 const struct nlattr *bc)
688 {
689 struct inet_diag_entry entry;
690 struct inet_connection_sock *icsk = inet_csk(sk);
691 struct listen_sock *lopt;
692 struct inet_sock *inet = inet_sk(sk);
693 int j, s_j;
694 int reqnum, s_reqnum;
695 int err = 0;
696
697 s_j = cb->args[3];
698 s_reqnum = cb->args[4];
699
700 if (s_j > 0)
701 s_j--;
702
703 entry.family = sk->sk_family;
704
705 read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
706
707 lopt = icsk->icsk_accept_queue.listen_opt;
708 if (!lopt || !lopt->qlen)
709 goto out;
710
711 if (bc != NULL) {
712 entry.sport = inet->inet_num;
713 entry.userlocks = sk->sk_userlocks;
714 }
715
716 for (j = s_j; j < lopt->nr_table_entries; j++) {
717 struct request_sock *req, *head = lopt->syn_table[j];
718
719 reqnum = 0;
720 for (req = head; req; reqnum++, req = req->dl_next) {
721 struct inet_request_sock *ireq = inet_rsk(req);
722
723 if (reqnum < s_reqnum)
724 continue;
725 if (r->id.idiag_dport != ireq->rmt_port &&
726 r->id.idiag_dport)
727 continue;
728
729 if (bc) {
730 inet_diag_req_addrs(sk, req, &entry);
731 entry.dport = ntohs(ireq->rmt_port);
732
733 if (!inet_diag_bc_run(bc, &entry))
734 continue;
735 }
736
737 err = inet_diag_fill_req(skb, sk, req,
738 sk_user_ns(NETLINK_CB(cb->skb).ssk),
739 NETLINK_CB(cb->skb).portid,
740 cb->nlh->nlmsg_seq, cb->nlh);
741 if (err < 0) {
742 cb->args[3] = j + 1;
743 cb->args[4] = reqnum;
744 goto out;
745 }
746 }
747
748 s_reqnum = 0;
749 }
750
751 out:
752 read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
753
754 return err;
755 }
756
757 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
758 struct netlink_callback *cb, struct inet_diag_req_v2 *r, struct nlattr *bc)
759 {
760 int i, num;
761 int s_i, s_num;
762 struct net *net = sock_net(skb->sk);
763
764 s_i = cb->args[1];
765 s_num = num = cb->args[2];
766
767 if (cb->args[0] == 0) {
768 if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
769 goto skip_listen_ht;
770
771 for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
772 struct sock *sk;
773 struct hlist_nulls_node *node;
774 struct inet_listen_hashbucket *ilb;
775
776 num = 0;
777 ilb = &hashinfo->listening_hash[i];
778 spin_lock_bh(&ilb->lock);
779 sk_nulls_for_each(sk, node, &ilb->head) {
780 struct inet_sock *inet = inet_sk(sk);
781
782 if (!net_eq(sock_net(sk), net))
783 continue;
784
785 if (num < s_num) {
786 num++;
787 continue;
788 }
789
790 if (r->sdiag_family != AF_UNSPEC &&
791 sk->sk_family != r->sdiag_family)
792 goto next_listen;
793
794 if (r->id.idiag_sport != inet->inet_sport &&
795 r->id.idiag_sport)
796 goto next_listen;
797
798 if (!(r->idiag_states & TCPF_LISTEN) ||
799 r->id.idiag_dport ||
800 cb->args[3] > 0)
801 goto syn_recv;
802
803 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
804 spin_unlock_bh(&ilb->lock);
805 goto done;
806 }
807
808 syn_recv:
809 if (!(r->idiag_states & TCPF_SYN_RECV))
810 goto next_listen;
811
812 if (inet_diag_dump_reqs(skb, sk, cb, r, bc) < 0) {
813 spin_unlock_bh(&ilb->lock);
814 goto done;
815 }
816
817 next_listen:
818 cb->args[3] = 0;
819 cb->args[4] = 0;
820 ++num;
821 }
822 spin_unlock_bh(&ilb->lock);
823
824 s_num = 0;
825 cb->args[3] = 0;
826 cb->args[4] = 0;
827 }
828 skip_listen_ht:
829 cb->args[0] = 1;
830 s_i = num = s_num = 0;
831 }
832
833 if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
834 goto out;
835
836 for (i = s_i; i <= hashinfo->ehash_mask; i++) {
837 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
838 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
839 struct sock *sk;
840 struct hlist_nulls_node *node;
841
842 num = 0;
843
844 if (hlist_nulls_empty(&head->chain) &&
845 hlist_nulls_empty(&head->twchain))
846 continue;
847
848 if (i > s_i)
849 s_num = 0;
850
851 spin_lock_bh(lock);
852 sk_nulls_for_each(sk, node, &head->chain) {
853 struct inet_sock *inet = inet_sk(sk);
854
855 if (!net_eq(sock_net(sk), net))
856 continue;
857 if (num < s_num)
858 goto next_normal;
859 if (!(r->idiag_states & (1 << sk->sk_state)))
860 goto next_normal;
861 if (r->sdiag_family != AF_UNSPEC &&
862 sk->sk_family != r->sdiag_family)
863 goto next_normal;
864 if (r->id.idiag_sport != inet->inet_sport &&
865 r->id.idiag_sport)
866 goto next_normal;
867 if (r->id.idiag_dport != inet->inet_dport &&
868 r->id.idiag_dport)
869 goto next_normal;
870 if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
871 spin_unlock_bh(lock);
872 goto done;
873 }
874 next_normal:
875 ++num;
876 }
877
878 if (r->idiag_states & TCPF_TIME_WAIT) {
879 struct inet_timewait_sock *tw;
880
881 inet_twsk_for_each(tw, node,
882 &head->twchain) {
883 if (!net_eq(twsk_net(tw), net))
884 continue;
885
886 if (num < s_num)
887 goto next_dying;
888 if (r->sdiag_family != AF_UNSPEC &&
889 tw->tw_family != r->sdiag_family)
890 goto next_dying;
891 if (r->id.idiag_sport != tw->tw_sport &&
892 r->id.idiag_sport)
893 goto next_dying;
894 if (r->id.idiag_dport != tw->tw_dport &&
895 r->id.idiag_dport)
896 goto next_dying;
897 if (inet_twsk_diag_dump(tw, skb, cb, r, bc) < 0) {
898 spin_unlock_bh(lock);
899 goto done;
900 }
901 next_dying:
902 ++num;
903 }
904 }
905 spin_unlock_bh(lock);
906 }
907
908 done:
909 cb->args[1] = i;
910 cb->args[2] = num;
911 out:
912 ;
913 }
914 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
915
916 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
917 struct inet_diag_req_v2 *r, struct nlattr *bc)
918 {
919 const struct inet_diag_handler *handler;
920 int err = 0;
921
922 handler = inet_diag_lock_handler(r->sdiag_protocol);
923 if (!IS_ERR(handler))
924 handler->dump(skb, cb, r, bc);
925 else
926 err = PTR_ERR(handler);
927 inet_diag_unlock_handler(handler);
928
929 return err ? : skb->len;
930 }
931
932 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
933 {
934 struct nlattr *bc = NULL;
935 int hdrlen = sizeof(struct inet_diag_req_v2);
936
937 if (nlmsg_attrlen(cb->nlh, hdrlen))
938 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
939
940 return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
941 }
942
943 static inline int inet_diag_type2proto(int type)
944 {
945 switch (type) {
946 case TCPDIAG_GETSOCK:
947 return IPPROTO_TCP;
948 case DCCPDIAG_GETSOCK:
949 return IPPROTO_DCCP;
950 default:
951 return 0;
952 }
953 }
954
955 static int inet_diag_dump_compat(struct sk_buff *skb, struct netlink_callback *cb)
956 {
957 struct inet_diag_req *rc = nlmsg_data(cb->nlh);
958 struct inet_diag_req_v2 req;
959 struct nlattr *bc = NULL;
960 int hdrlen = sizeof(struct inet_diag_req);
961
962 req.sdiag_family = AF_UNSPEC; /* compatibility */
963 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
964 req.idiag_ext = rc->idiag_ext;
965 req.idiag_states = rc->idiag_states;
966 req.id = rc->id;
967
968 if (nlmsg_attrlen(cb->nlh, hdrlen))
969 bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
970
971 return __inet_diag_dump(skb, cb, &req, bc);
972 }
973
974 static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
975 const struct nlmsghdr *nlh)
976 {
977 struct inet_diag_req *rc = nlmsg_data(nlh);
978 struct inet_diag_req_v2 req;
979
980 req.sdiag_family = rc->idiag_family;
981 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
982 req.idiag_ext = rc->idiag_ext;
983 req.idiag_states = rc->idiag_states;
984 req.id = rc->id;
985
986 return inet_diag_get_exact(in_skb, nlh, &req);
987 }
988
989 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
990 {
991 int hdrlen = sizeof(struct inet_diag_req);
992 struct net *net = sock_net(skb->sk);
993
994 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
995 nlmsg_len(nlh) < hdrlen)
996 return -EINVAL;
997
998 if (nlh->nlmsg_flags & NLM_F_DUMP) {
999 if (nlmsg_attrlen(nlh, hdrlen)) {
1000 struct nlattr *attr;
1001
1002 attr = nlmsg_find_attr(nlh, hdrlen,
1003 INET_DIAG_REQ_BYTECODE);
1004 if (attr == NULL ||
1005 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
1006 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
1007 return -EINVAL;
1008 }
1009 {
1010 struct netlink_dump_control c = {
1011 .dump = inet_diag_dump_compat,
1012 };
1013 return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
1014 }
1015 }
1016
1017 return inet_diag_get_exact_compat(skb, nlh);
1018 }
1019
1020 static int inet_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
1021 {
1022 int hdrlen = sizeof(struct inet_diag_req_v2);
1023 struct net *net = sock_net(skb->sk);
1024
1025 if (nlmsg_len(h) < hdrlen)
1026 return -EINVAL;
1027
1028 if (h->nlmsg_flags & NLM_F_DUMP) {
1029 if (nlmsg_attrlen(h, hdrlen)) {
1030 struct nlattr *attr;
1031 attr = nlmsg_find_attr(h, hdrlen,
1032 INET_DIAG_REQ_BYTECODE);
1033 if (attr == NULL ||
1034 nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
1035 inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
1036 return -EINVAL;
1037 }
1038 {
1039 struct netlink_dump_control c = {
1040 .dump = inet_diag_dump,
1041 };
1042 return netlink_dump_start(net->diag_nlsk, skb, h, &c);
1043 }
1044 }
1045
1046 return inet_diag_get_exact(skb, h, nlmsg_data(h));
1047 }
1048
1049 static const struct sock_diag_handler inet_diag_handler = {
1050 .family = AF_INET,
1051 .dump = inet_diag_handler_dump,
1052 };
1053
1054 static const struct sock_diag_handler inet6_diag_handler = {
1055 .family = AF_INET6,
1056 .dump = inet_diag_handler_dump,
1057 };
1058
1059 int inet_diag_register(const struct inet_diag_handler *h)
1060 {
1061 const __u16 type = h->idiag_type;
1062 int err = -EINVAL;
1063
1064 if (type >= IPPROTO_MAX)
1065 goto out;
1066
1067 mutex_lock(&inet_diag_table_mutex);
1068 err = -EEXIST;
1069 if (inet_diag_table[type] == NULL) {
1070 inet_diag_table[type] = h;
1071 err = 0;
1072 }
1073 mutex_unlock(&inet_diag_table_mutex);
1074 out:
1075 return err;
1076 }
1077 EXPORT_SYMBOL_GPL(inet_diag_register);
1078
1079 void inet_diag_unregister(const struct inet_diag_handler *h)
1080 {
1081 const __u16 type = h->idiag_type;
1082
1083 if (type >= IPPROTO_MAX)
1084 return;
1085
1086 mutex_lock(&inet_diag_table_mutex);
1087 inet_diag_table[type] = NULL;
1088 mutex_unlock(&inet_diag_table_mutex);
1089 }
1090 EXPORT_SYMBOL_GPL(inet_diag_unregister);
1091
1092 static int __init inet_diag_init(void)
1093 {
1094 const int inet_diag_table_size = (IPPROTO_MAX *
1095 sizeof(struct inet_diag_handler *));
1096 int err = -ENOMEM;
1097
1098 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1099 if (!inet_diag_table)
1100 goto out;
1101
1102 err = sock_diag_register(&inet_diag_handler);
1103 if (err)
1104 goto out_free_nl;
1105
1106 err = sock_diag_register(&inet6_diag_handler);
1107 if (err)
1108 goto out_free_inet;
1109
1110 sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
1111 out:
1112 return err;
1113
1114 out_free_inet:
1115 sock_diag_unregister(&inet_diag_handler);
1116 out_free_nl:
1117 kfree(inet_diag_table);
1118 goto out;
1119 }
1120
1121 static void __exit inet_diag_exit(void)
1122 {
1123 sock_diag_unregister(&inet6_diag_handler);
1124 sock_diag_unregister(&inet_diag_handler);
1125 sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
1126 kfree(inet_diag_table);
1127 }
1128
1129 module_init(inet_diag_init);
1130 module_exit(inet_diag_exit);
1131 MODULE_LICENSE("GPL");
1132 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1133 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);
Linux kernel - Deliverables
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